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CN107255782B - A kind of high-voltage interlocking detection circuit and interlocking signal detection method - Google Patents

A kind of high-voltage interlocking detection circuit and interlocking signal detection method Download PDF

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Publication number
CN107255782B
CN107255782B CN201710374331.5A CN201710374331A CN107255782B CN 107255782 B CN107255782 B CN 107255782B CN 201710374331 A CN201710374331 A CN 201710374331A CN 107255782 B CN107255782 B CN 107255782B
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Prior art keywords
voltage interlocking
voltage
detection circuit
current
loop
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CN107255782A (en
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陈剑锋
邬学建
史涛
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Zhejiang Geely Holding Group Co Ltd
Geely Automobile Research Institute Ningbo Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Geely Automobile Research Institute Ningbo Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
    • G01R31/2836—Fault-finding or characterising
    • G01R31/2843—In-circuit-testing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention provides a kind of high-voltage interlocking detection circuit and interlocking signal detection methods, are related to electric vehicle engineering field.High-voltage interlocking detection circuit of the invention, is integrated in the battery management system of electric car, including micro-control unit, high-voltage interlocking circuit, high-voltage interlocking detection circuit output end system and high-voltage interlocking detection circuit input end system.Multiple interfaces are provided on micro-control unit.High-voltage interlocking circuit includes input terminal and output end.One end of high-voltage interlocking detection circuit output end system and high-voltage interlocking detection circuit input end system is connect with two interfaces of micro-control unit respectively, and the other end is connect with the input terminal in high-voltage interlocking circuit and output end respectively.High-voltage interlocking detection circuit input end system and high-voltage interlocking detection circuit output end system realize the detection to high-voltage interlocking signal by the current signal on detection high-voltage interlocking circuit, and are accurately positioned the malfunction in high-voltage interlocking circuit.

Description

High-voltage interlocking detection circuit and interlocking signal detection method
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a high-voltage interlocking detection system and a high-voltage interlocking signal detection method.
Background
At present, the requirements on the capability of detecting the state of a high-voltage system and the detection reliability in an electric automobile are higher and higher, so that the battery management system is required to be capable of more reliably detecting the high-voltage interlocking state and accurately detecting and positioning the fault reason. The existing solutions are implemented by detecting PWM waveforms or voltage level signals, and such methods have the following disadvantages: (1) when the transmission distance is long, the voltage drop is large due to the existence of the line resistance, the reliability of detection is affected, and long-distance transmission cannot be realized; (2) the diagnosis function items of the high-voltage interlocking loop are not comprehensive, and the fault reason can not be accurately positioned.
Disclosure of Invention
An object of the present invention is to provide a high voltage interlock detection circuit capable of accurately positioning a high voltage interlock detection system. Another object of the present invention is to provide a method for detecting an interlock signal.
In particular, the present invention provides a high voltage interlock detection circuit, integrated in a battery management system of an electric vehicle, comprising:
the micro control unit is provided with a plurality of interfaces;
a high voltage interlock loop including an input and an output;
one end of the output end system of the high-voltage interlocking detection circuit is connected with any two interfaces of the plurality of interfaces of the micro control unit, and the other end of the output end system of the high-voltage interlocking detection circuit is connected with the input end of the high-voltage interlocking loop; and
one end of the input end system of the high-voltage interlocking detection circuit is connected with two interfaces of the rest of the interfaces of the micro control unit, and the other end of the input end system of the high-voltage interlocking detection circuit is connected with the output end of the high-voltage interlocking loop;
the high-voltage interlocking detection circuit input end system and the high-voltage interlocking detection circuit output end system realize the detection of high-voltage interlocking signals by detecting current signals on the high-voltage interlocking loop and accurately position the fault state of the high-voltage interlocking loop.
Further, the high-voltage interlock detection circuit output end system comprises:
a first voltage source;
a first detection resistor including a first terminal and a second terminal, the first terminal being connected to the first voltage source;
a first current direction detection circuit, including a first input terminal and a first output terminal, where the first input terminal is connected to the first terminal and the second terminal of the first detection resistor, the first output terminal is connected to a first interface of the micro control unit, and the first current direction detection circuit is configured to detect a current flowing from the first terminal to the second terminal of the first detection resistor; and
a second current direction detection circuit, which includes a second input terminal and a second output terminal, wherein the second input terminal is connected to the first terminal and the second terminal of the first detection resistor, and the second output terminal is connected to one of the interfaces of the micro control unit; the second current direction detection circuit is configured to detect a current flowing from the second terminal to the first terminal of the first detection resistor.
Further, the first current direction detection circuit includes: the circuit comprises a first operational amplifier, a first resistor, a second resistor and a first diode; wherein,
the first operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the first operational amplifier is connected with the first end of the first detection resistor and the first voltage source, the reverse input end of the first operational amplifier is connected with the second end, and the output end of the first operational amplifier is connected with one end of the first resistor; the other end of the first resistor is respectively connected with one end of the second resistor, one end of the first diode and a first interface of the micro control unit; the other end of the second resistor is connected with the other end of the first diode and grounded;
the second current direction detection circuit includes: the second operational amplifier, the third resistor, the fourth resistor and the second diode; wherein,
the second operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the second operational amplifier is connected with the second end of the first detection resistor, the reverse input end of the second operational amplifier is connected with the first end and the first voltage source, and the output end of the second operational amplifier is connected with one end of the third resistor; the other end of the third resistor is respectively connected with one end of the fourth resistor, one end of the second diode and a second interface of the micro control unit; the other end of the fourth resistor and the other end of the second diode are connected and grounded.
Further, the high-voltage interlock detection circuit input end system comprises:
a second voltage source;
the second detection resistor comprises a third end and a fourth end, and the third end is connected with the second voltage source;
a third current direction detection circuit, including a third input terminal and a third output terminal, where the third input terminal is connected to the third terminal and the fourth terminal of the second detection resistor, the third output terminal is connected to a third interface of the micro control unit, and the third current direction detection circuit is configured to detect a current flowing from the fourth terminal to the third terminal of the second detection resistor; and
and the fourth current direction detection circuit comprises a fourth input end and a fourth output end, the fourth input end is connected with the third end and the fourth end of the second detection resistor, the fourth output end is connected with a fourth interface of the micro control unit, and the fourth current direction detection circuit is used for detecting the current flowing from the third end to the fourth end of the second detection resistor.
Further, the third current direction detection circuit includes: a third operational amplifier, a fifth resistor, a sixth resistor and a third diode; wherein,
the third operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the third operational amplifier is connected with the fourth end of the second detection resistor, the reverse input end of the third operational amplifier is connected with the first end of the second detection resistor and the second voltage source, and the output end of the third operational amplifier is connected with one end of the fifth resistor; the other end of the fifth resistor is respectively connected with one end of the sixth resistor, one end of the third diode and a third interface of the micro control unit; the other end of the sixth resistor and the other end of the third diode are connected and grounded;
the fourth current direction detection circuit includes: a fourth operational amplifier, a seventh resistor, an eighth resistor, and a fourth diode; wherein,
the fourth operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the fourth operational amplifier is connected with the first end of the second detection resistor, the reverse input end of the fourth operational amplifier is connected with the second end of the second detection resistor and the second voltage source, and the output end of the fourth operational amplifier is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the eighth resistor, one end of the fourth diode and a fourth interface of the micro control unit respectively; the other end of the eighth resistor and the other end of the fourth diode are connected and grounded.
Further, the high-voltage interlocking loop comprises a battery pack high-voltage connector, a maintenance switch and a high-voltage electric equipment connector which are sequentially connected, and the high-voltage interlocking detection circuit output end system, the micro control unit and the high-voltage interlocking detection circuit input end system are sequentially connected to form a series circuit.
Furthermore, the first current direction detection circuit, the second current direction detection circuit, the third current direction detection circuit and the fourth current direction detection circuit are respectively connected with the micro control unit, and the current directions of the first detection resistor and the second detection resistor are judged according to the voltage signal of the micro control unit, so as to judge the current signal flowing through the high-voltage interlocking loop; wherein,
when the first operational amplifier detects that current flows from the first end to the second end of the first detection resistor, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop, and the voltage displayed at the first interface of the micro control unit is positive voltage, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is positive current; when the second operational amplifier detects that current flows from the second end to the first end of the first detection resistor or no current exists, namely the current flows from the output end of the high-voltage interlocking loop to the input end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the first interface of the micro control unit is 0, and at the moment, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0;
when the second operational amplifier detects that current flows from the first end to the second end of the first detection resistor or no current exists, namely the current flows from the input end of the high-voltage interlocking loop to the output end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the second interface of the micro control unit is 0, and at the moment, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0; when the second operational amplifier detects that current flows from the second end to the first end of the first detection resistor, namely the current flows from the output end of the high-voltage interlocking loop to the input end after passing through the high-voltage interlocking loop, and the voltage displayed at the second interface of the micro control unit is positive voltage, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is negative current;
when the third operational amplifier detects that current flows from the third end to the fourth end of the second detection resistor or no current exists, namely the current flows from the output end of the high-voltage interlocking loop to the input end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the third interface of the micro control unit is 0, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0; when the third operational amplifier detects that current flows from the fourth end to the third end of the second detection resistor, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop, and the voltage displayed at the third interface of the micro control unit is positive voltage, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is positive current;
when the fourth operational amplifier detects that current flows from the third end to the fourth end of the second detection resistor, namely the current flows from the output end of the high-voltage interlocking loop to the input end after passing through the high-voltage interlocking loop, the voltage displayed at the fourth interface of the micro control unit is positive voltage, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is negative current; when the fourth operational amplifier detects that current flows from the fourth end to the third end of the second detection resistor or no current exists, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop or no current exists in the high-voltage interlocking loop, the voltage displayed at the fourth interface of the micro control unit is 0, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0.
Furthermore, the fault state of the high-voltage interlocking circuit comprises a normal state, an open-circuit state, a short-circuit state of a high-voltage interlocking detection circuit output end system to a storage battery power supply, a short-circuit state of a high-voltage interlocking detection circuit output end system to the ground, a short-circuit state of a high-voltage interlocking detection circuit input end system to the storage battery power supply, a short-circuit state of a high-voltage interlocking detection circuit input end system to the ground, a short-circuit state of the high-voltage interlocking circuit which is communicated with the storage battery power supply and a short-circuit state; wherein,
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both positive currents, the high-voltage interlocking loop is identified to be in a normal state;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both 0, the high-voltage interlocking loop is identified to be in an open circuit state;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is negative current, and meanwhile, the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, the high-voltage interlocking loop is identified as a short-circuit state of the high-voltage interlocking detection circuit output end system to the storage battery power supply;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, identifying that the high-voltage interlocking loop is in a ground short circuit state of the high-voltage interlocking detection circuit output end system;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is a positive current, the high-voltage interlocking loop is identified as a short-circuit state of the input end system of the high-voltage interlocking detection circuit on a storage battery power supply;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current, the high-voltage interlocking loop is identified as a ground short circuit state of the input end system of the high-voltage interlocking detection circuit;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is positive current, the high-voltage interlocking loop is identified to be in a state that the high-voltage interlocking loop is communicated but short-circuited to a power supply of a storage battery;
and when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is a negative current, identifying that the high-voltage interlocking loop is in a state of high-voltage interlocking loop communication but short circuit to the ground.
Further, the invention also provides a high-voltage interlocking signal detection method, which comprises the following steps:
the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit are connected with the micro control unit and the high-voltage interlocking loop;
the high-voltage interlocking detection circuit output end system and the high-voltage interlocking detection circuit input end system detect current signals flowing through the high-voltage interlocking loop and display the current signals in the micro control unit in the form of voltage signals;
and identifying the current condition of the high-voltage interlocking loop according to the voltage signal so as to identify the fault state of the high-voltage interlocking loop.
Furthermore, the fault state of the high-voltage interlocking circuit comprises a normal state, an open-circuit state, a short-circuit state of a high-voltage interlocking detection circuit output end system to a storage battery power supply, a short-circuit state of a high-voltage interlocking detection circuit output end system to the ground, a short-circuit state of a high-voltage interlocking detection circuit input end system to the storage battery power supply, a short-circuit state of a high-voltage interlocking detection circuit input end system to the ground, a short-circuit state of the high-voltage interlocking circuit which is communicated with the storage battery power supply and a short-circuit state; wherein,
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both positive currents, the high-voltage interlocking loop is identified to be in a normal state;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both 0, the high-voltage interlocking loop is identified to be in an open circuit state;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is negative current, and meanwhile, the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, the high-voltage interlocking loop is identified as a short-circuit state of the high-voltage interlocking detection circuit output end system to the storage battery power supply;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, identifying that the high-voltage interlocking loop is in a ground short circuit state of the high-voltage interlocking detection circuit output end system;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is a positive current, the high-voltage interlocking loop is identified as a short-circuit state of the input end system of the high-voltage interlocking detection circuit on a storage battery power supply;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current, the high-voltage interlocking loop is identified as a ground short circuit state of the input end system of the high-voltage interlocking detection circuit;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is positive current, the high-voltage interlocking loop is identified to be in a state that the high-voltage interlocking loop is communicated but short-circuited to a power supply of a storage battery;
and when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is a negative current, identifying that the high-voltage interlocking loop is in a state of high-voltage interlocking loop communication but short circuit to the ground.
The high-voltage interlocking detection circuit can accurately detect the fault reason of the high-voltage interlocking loop, is not influenced by the distance, and has very reliable detection results when the distance is long.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of a high voltage interlock detection circuit according to one embodiment of the present invention;
FIG. 2 is a circuit diagram of a high voltage interlock detection circuit according to one embodiment of the present invention;
FIG. 3 is a schematic block diagram of a high voltage interlock detection circuit of one particular embodiment shown in FIG. 2;
FIG. 4 is a flow chart of a high voltage interlock signal detection method according to one embodiment of the present invention.
Detailed Description
FIG. 1 is a schematic block diagram of a high voltage interlock detection circuit 100 according to one embodiment of the present invention. The high-voltage interlock detection circuit 100 is integrated in a battery management system of an electric vehicle, and may generally include a micro control unit 10, a high-voltage interlock loop 20, a high-voltage interlock detection circuit output terminal system 30, and a high-voltage interlock detection circuit input terminal system 40, which are connected to each other. Fig. 2 and 3 show a circuit diagram and schematic block diagram of a high voltage interlock detection circuit 100 of a particular embodiment. The micro control unit 10 is provided with a plurality of interfaces, specifically four interfaces (i.e. 11, 12, 13, and 14), which are respectively connected to the high-voltage interlock detection circuit output system 30 and the high-voltage interlock detection circuit input system 40. The high voltage interlock loop 20 includes an input 21 and an output 22. One end of the output end system 30 of the high-voltage interlock detection circuit is connected to two interfaces (i.e. 11, 12) of the plurality of interfaces of the micro control unit 10, and the other end is connected to the input end 21 of the high-voltage interlock loop 20. The high voltage interlock detection circuit input end system 40 is connected at one end to two of the remaining interfaces (i.e. 13, 14) of the plurality of interfaces of the micro control unit 10 and at the other end to the output 22 of the high voltage interlock loop 20. The high-voltage interlock detection circuit input end system 40 and the high-voltage interlock detection circuit output end system 30 detect a high-voltage interlock signal by detecting a current signal on the high-voltage interlock loop 20, and accurately locate a fault state of the high-voltage interlock loop 20. The high-voltage interlock detection circuit 100 of the present invention can accurately detect the failure cause of the high-voltage interlock loop 20, and is not affected by the distance, and the detection result is very reliable when the distance is long.
As a specific example, the high-voltage interlock detection circuit output end system 30 may include a first voltage source 31, a first detection resistor 32, a first current direction detection circuit 33, and a second current direction detection circuit 34. The first detection resistor 32 includes a first terminal 321 and a second terminal 322, and the first terminal 321 is connected to the first voltage source 31. The first current direction detection circuit 33 includes a first input end and a first output end, the first input end is connected to the first end 321 and the second end 322 of the first detection resistor 32, the first output end is connected to the first interface 11 of the micro control unit 10, and the first current direction detection circuit 33 is configured to detect a current flowing from the first end 321 to the second end 322 of the first detection resistor 32. Specifically, when the current of the first detection resistor 32 flows from the first end 321 to the second end 322, the first current direction detection circuit 33 detects a positive current, and when the current of the first detection resistor 32 flows from the second end 322 to the first end 321, the first current direction detection circuit 33 does not detect a current signal.
The second current direction detection circuit 34 includes a second input terminal and a second output terminal, the second input terminal is connected to the first terminal 321 and the second terminal 322 of the first detection resistor 32, and the second output terminal is connected to the second interface 12 of the micro control unit 10. The second current direction detecting circuit 34 is used for detecting the current flowing from the second end 322 to the first end 321 of the first detecting resistor 32. Specifically, the second current direction detection circuit 34 detects a negative current when the current of the first detection resistor 32 flows from the second terminal 322 to the first terminal 321, and the second current direction detection circuit 34 does not detect a current signal when the current of the first detection resistor 32 flows from the first terminal 321 to the second terminal 322.
As a specific embodiment, the first current direction detection circuit 33 includes a first operational amplifier 331, a first resistor 332, a second resistor 333, and a first diode 334. The first operational amplifier 331 includes a forward input end 335, an inverse input end 336 and an output end 337, the forward input end 335 of the first operational amplifier 331 is connected to the first end 321 of the first detection resistor 32 and the first voltage source 31, the inverse input end 336 of the first operational amplifier 331 is connected to the second end 322, and the output end 337 of the first operational amplifier 331 is connected to one end of the first resistor 332. The other end of the first resistor 332 is connected to one end of the second resistor 333, one end of the first diode 334, and the first interface 11 of the micro control unit 10. The other end of the second resistor 333 and the other end of the first diode 334 are connected to ground.
The second current direction detection circuit 34 includes a second operational amplifier 341, a third resistor 342, a fourth resistor 343, and a second diode 344. The second operational amplifier 341 includes a positive input 345, a negative input 346, and an output 347. The forward input terminal 345 of the second operational amplifier 341 is connected to the second terminal 322 of the first detection resistor 32, the reverse input terminal 346 of the second operational amplifier 341 is connected to the first terminal 321 and the first voltage source 31, and the output terminal 347 of the second operational amplifier 341 is connected to one terminal of the third resistor 342. The other end of the third resistor 342 is connected to one end of the fourth resistor 343, one end of the second diode 344, and the second interface 12 of the micro control unit 10, respectively. The other end of the fourth resistor 343 and the other end of the second diode 344 are connected to ground.
Specifically, the first current direction detection circuit 33 and the second current direction detection circuit 34 are connected in the same manner as the devices, and only the forward input terminal and the reverse input terminal of the operational amplifier are connected in the reverse direction with the first terminal 321 and the second terminal 322 of the first detection resistor 32, so that the forward current and the reverse current of the first detection resistor 32 are detected respectively.
Further, the input terminal system 40 of the high-voltage interlock detection circuit includes a second voltage source 41, a second detection resistor 42, a third current direction detection circuit 43, and a fourth current direction detection circuit 44. The second detection resistor 42 includes a third terminal 421 and a fourth terminal 422, and the third terminal 421 is connected to the second voltage source 41. The third current direction detection circuit 43 includes a third input end and a third output end, the third input end is connected to the third end 421 and the fourth end 422 of the second detection resistor 42, the third output end is connected to the third interface 13 of the micro control unit 10, and the third current direction detection circuit 43 is configured to detect a current flowing from the fourth end 422 of the second detection resistor 42 to the third end 421. Specifically, the third current direction detection circuit 43 detects a positive current when the current of the second detection resistor 42 flows from the fourth terminal 422 to the third terminal 421, and the second current direction detection circuit 34 does not detect a current signal when the current of the second detection resistor 42 flows from the third terminal 421 to the fourth terminal 422.
The fourth current direction detection circuit 44 includes a fourth input end and a fourth output end, the fourth input end is connected to the third end 421 and the fourth end 422 of the second detection resistor 42, the fourth output end is connected to the fourth interface 14 of the micro control unit 10, and the fourth current direction detection circuit 44 is configured to detect a current flowing from the third end 421 to the fourth end 422 of the second detection resistor 42. Specifically, the fourth current direction detection circuit 44 detects a negative current when the current of the second detection resistor 42 flows from the third terminal 421 to the fourth terminal 422, and the fourth current direction detection circuit 44 does not detect a current signal when the current of the second detection resistor 42 flows from the fourth terminal 422 to the third terminal 421.
The third current direction detection circuit 43 has substantially the same structure as the first current direction detection circuit 33. Specifically, a third operational amplifier 431, a fifth resistor 432, a sixth resistor 433, and a third diode 434 are included. Wherein the third operational amplifier 431 comprises a forward input end 435, an inverse input end 436 and an output end 437, the forward input end of the third operational amplifier 431 is connected with the fourth end 422 of the second detection resistor 42, the inverse input end of the third operational amplifier 431 is connected with the first end 321 of the second detection resistor 42 and the second voltage source 41, and the output end of the third operational amplifier 431 is connected with one end of the fifth resistor 432. The other end of the fifth resistor 432 is connected to one end of the sixth resistor 433, one end of the third diode 434, and the third interface 13 of the micro control unit 10, respectively. The other end of the sixth resistor 433 and the other end of the third diode 434 are connected to ground.
The fourth current direction detection circuit 44 has substantially the same structure as the second current direction detection circuit 34, and specifically includes a fourth operational amplifier 441, a seventh resistor 442, an eighth resistor 443, and a fourth diode 444. The fourth operational amplifier 441 comprises a forward input 445, an inverting input 446 and an output 447. A forward input terminal of the fourth operational amplifier 441 is connected to the first terminal 321 of the second detection resistor 42, a reverse input terminal of the fourth operational amplifier 441 is connected to the second terminal 322 of the second detection resistor 42 and the second voltage source 41, and the output terminal of the fourth operational amplifier 441 is connected to one terminal of the seventh resistor 442. The other end of the seventh resistor 442 is connected to one end of the eighth resistor 443, one end of the fourth diode 444, and the fourth interface 14 of the micro control unit 10. The other end of the eighth resistor 443 and the other end of the fourth diode 444 are connected to ground.
Preferably, the voltage of the first voltage source 31 is greater than the voltage of the second voltage source 41, and the voltage of the first voltage source 31 is less than the voltage of the electric vehicle battery power source. The storage battery power supply is arranged at the input end system 40 of the high-voltage interlocking detection circuit and the output end system 30 of the high-voltage interlocking detection circuit, and is connected with the storage battery power supply when the input end system 40 of the high-voltage interlocking detection circuit and the output end system 30 of the high-voltage interlocking detection circuit are disconnected with the high-voltage interlocking loop 20.
Specifically, the third current direction detection circuit 43 and the fourth current direction detection circuit 44 are connected in the same manner as the devices, but only the forward input terminal and the reverse input terminal of the operational amplifier are connected in the reverse direction with the third terminal 421 and the fourth terminal 422 of the second detection resistor 42, so that the forward current and the reverse current of the second detection resistor 42 are detected respectively.
As a specific embodiment, the high-voltage interlock loop 20 includes a battery pack high-voltage connector 23, a maintenance switch 24, and a high-voltage electric device connector 25, which are connected in sequence, and are connected in sequence with the high-voltage interlock detection circuit output end system 30, the micro control unit 10, and the high-voltage interlock detection circuit input end system 40 to form a series circuit.
The first current direction detection circuit 33, the second current direction detection circuit 34, the third current direction detection circuit 43, and the fourth current direction detection circuit 44 are respectively connected to the micro control unit 10, and the current direction flowing through the first detection resistor 32 and the second detection resistor 42 is determined by a voltage signal displayed by the micro control unit 10, so as to determine a current signal flowing through the high-voltage interlock loop 20.
Specifically, the corresponding relationship between the ground voltage signal and the current signal is as follows:
when the first operational amplifier 331 detects that a current flows from the first end 321 to the second end 322 of the first detection resistor 32, that is, the current flows from the input end 21 of the high-voltage interlock loop 20 to the output end 22 through the high-voltage interlock loop 20, the voltage displayed at the first interface 11 of the mcu is a positive voltage, and at this time, it is recognized that the current in the high-voltage interlock loop 20 detected by the high-voltage interlock detection circuit output system 30 is a positive current. When the first operational amplifier 331 detects that a current flows from the second end 322 to the first end 321 of the first detection resistor 32 or there is no current, that is, the current flows from the output end 22 of the high voltage interlock loop 20 to the input end 21 after passing through the high voltage interlock loop 20 or there is no current in the high voltage interlock loop 20, the voltage displayed at the first interface 11 of the micro control unit 10 is 0, and at this time, it is recognized that the high voltage interlock detection circuit output end system 30 detects that the current in the high voltage interlock loop 20 is 0.
When the second operational amplifier 341 detects that the current flows from the first end 321 to the second end 322 of the first detection resistor 32 or there is no current, that is, the current flows from the input end 21 of the high voltage interlock loop 20 to the output end 22 after passing through the high voltage interlock loop 20 or there is no current in the high voltage interlock loop 20, the voltage displayed at the second interface 12 of the micro control unit 10 is 0, and at this time, it is recognized that the current in the high voltage interlock loop 20 detected by the high voltage interlock detection circuit output end system 30 is 0. When the second operational amplifier 341 detects that the current flows from the second end 322 to the first end 321 of the first detection resistor 32, that is, the current flows from the output end 22 of the high voltage interlock loop 20 to the input end 21 through the high voltage interlock loop 20, the voltage displayed at the second interface 12 of the micro control unit 10 is a positive voltage, and at this time, it is recognized that the current in the high voltage interlock loop 20 is detected as a negative current by the high voltage interlock detection circuit output end system 30.
When the third operational amplifier 431 detects that a current flows from the third terminal 421 to the fourth terminal 422 of the second detection resistor 42 or there is no current, that is, the current flows from the output terminal 22 of the high voltage interlock loop 20 to the input terminal 21 through the high voltage interlock loop 20 or there is no current in the high voltage interlock loop 20, the voltage displayed at the third interface 13 of the micro control unit 10 is 0, and it is identified that the high voltage interlock detection circuit input end system 40 detects that the current in the high voltage interlock loop 20 is 0. When the third operational amplifier 431 detects that a current flows from the fourth terminal 422 to the third terminal 421 of the second detection resistor 42, that is, the current flows from the input terminal 21 of the high-voltage interlock loop 20 to the output terminal 22 through the high-voltage interlock loop 20, the voltage displayed at the third interface 13 of the micro control unit 10 is a positive voltage, and it is identified that the current in the high-voltage interlock loop 20 is detected by the high-voltage interlock detection circuit input end system 40 as a positive current.
When the fourth operational amplifier 441 detects that a current flows from the third end 421 to the fourth end 422 of the second detection resistor 42, that is, the current flows from the output end 22 of the high-voltage interlock loop 20 to the input end 21 through the high-voltage interlock loop 20, the voltage displayed at the fourth interface 14 of the micro control unit 10 is a positive voltage, and at this time, it is recognized that the high-voltage interlock detection circuit input end system 40 detects that the current in the high-voltage interlock loop 20 is a negative current. When the fourth operational amplifier 441 detects that a current flows from the fourth terminal 422 to the third terminal 421 of the second detection resistor 42 or there is no current, that is, a current flows from the input terminal 21 of the high-voltage interlock loop 20 to the output terminal 22 through the high-voltage interlock loop 20 or there is no current in the high-voltage interlock loop 20, the voltage displayed at the fourth interface 14 of the mcu 10 is 0, and it is identified that the input terminal system 40 of the high-voltage interlock detection circuit detects that the current in the high-voltage interlock loop 20 is 0.
When the voltage signals in the mcu 10 show different states, the corresponding high-voltage interlock loop 20 is in a different state. The corresponding relationship between the voltage signal of the mcu 10 and the corresponding state of the high-voltage interlock loop 20 is shown in table 1 below.
TABLE 1 shows the correspondence between the status of the high voltage interlock loop 20 and the voltage signal displayed in the MCU 10
Where, VIO1 in table 1 indicates that the current signal of first detection resistor 32 detected by first current direction detection circuit 33 corresponds to the voltage signal displayed at first interface 11 in micro control unit 10. VIO2 is the voltage signal displayed at second interface 12 in micro-control unit 10 that corresponds to the current signal detected by second current direction sensing circuit 34 at first sensing resistor 32. VIO3 is the voltage signal displayed at third interface 13 in micro-control unit 10 corresponding to the current signal detected by third current direction detection circuit 43 at second detection resistor 42. VIO4 is the current signal detected by fourth current direction detection circuit 44 for second detection resistor 42 that corresponds to the voltage signal displayed at fourth interface 14 in micro-control unit 10. Specifically, when VIO1 is 1 and VIO2 is 0, it indicates that the current flowing through the first detection resistor 32 is a forward current, and the current flowing through the high voltage interlock loop 20 at this time is defined as a forward current. When VIO1 is 0 and VIO2 is 1, it indicates that the current flowing through the first detection resistor 32 is negative current, and defines the current flowing through the high-voltage interlock loop 20 as negative current. When VIO1 is 0 and VIO2 is 0, it indicates that the current flowing through the first detection resistor 32 is 0, which defines the current flowing through the high voltage interlock loop 20 as 0. When VIO3 is 1 and VIO4 is 0, it indicates that the current flowing through the second detection resistor 42 is a forward current, and defines the current flowing through the high voltage interlock loop 20 as a forward current. When VIO3 is 0 and VIO4 is 1, it indicates that the current flowing through the second detection resistor 42 is negative current, and defines the current flowing through the high-voltage interlock loop 20 as negative current. When VIO3 is 0 and VIO4 is 0, it indicates that the current flowing through the second sensing resistor 42 is 0, which defines the current flowing through the high voltage interlock loop 20 as 0. The current flowing from the first side to the second side of the first detecting resistor 32 is a positive current, and vice versa. The current flowing from the fourth side to the third side of the second sensing resistor 42 is positive, and vice versa.
Specifically, as shown in table 1, the states of the high-voltage interlock loop 20 include a normal state, an open state, a short-circuit state of the high-voltage interlock detection circuit output end system 30 to the battery power supply, a short-circuit state of the high-voltage interlock detection circuit output end system 30 to ground, a short-circuit state of the high-voltage interlock detection circuit input end system 40 to the battery power supply, a short-circuit state of the high-voltage interlock detection circuit input end system 40 to ground, a short-circuit state of the high-voltage interlock loop but to the battery power supply and a short-circuit state of the high-voltage interlock loop.
Specifically, when the mcu 10 displays that the currents of the high-voltage interlock detection circuit output system 30 and the high-voltage interlock detection circuit input system 40 are both positive currents, the high-voltage interlock circuit 20 is identified as a normal state.
When the micro control unit 10 displays that the currents of the high-voltage interlock detection circuit output end system 30 and the high-voltage interlock detection circuit input end system 40 detected that the currents of the high-voltage interlock loop 20 are both 0, it is identified that the high-voltage interlock loop 20 is in an open circuit state.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit output end system 30 detected the high-voltage interlock loop 20 is a negative current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is 0, it is identified that the high-voltage interlock loop 20 is in a short-circuit state of the high-voltage interlock detection circuit output end system 30 to the storage battery power supply.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit output end system 30 detected the high-voltage interlock loop 20 is a forward current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is 0, it is identified that the high-voltage interlock loop 20 is in a short circuit state to ground of the high-voltage interlock detection circuit output end system 30.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit output end system 30 is 0 and the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit input end system 40 is a forward current, it is identified that the high-voltage interlock detection circuit 20 is in a short-circuit state of the high-voltage interlock detection circuit input end system 40 to the storage battery power supply.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit output end system 30 is 0, and meanwhile, the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock detection circuit 20 is negative current, it is identified that the high-voltage interlock detection circuit 20 is in a ground short circuit state of the high-voltage interlock detection circuit input end system 40.
When the micro control unit 10 displays that the current of the high-voltage interlock loop 20 detected by the high-voltage interlock detection circuit output end system 30 is negative current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is positive current, it is identified that the high-voltage interlock loop 20 is in a state of high-voltage interlock loop communication but short circuit to the storage battery power supply.
When the micro control unit 10 displays that the current of the high-voltage interlock loop 20 detected by the high-voltage interlock detection circuit output end system 30 is a positive current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is a negative current, it is identified that the high-voltage interlock loop 20 is in a state of high-voltage interlock loop communication but short circuit to the ground.
Fig. 4 shows a flow chart of a high voltage interlock signal detection method according to an embodiment of the invention.
As a specific embodiment, the method for detecting a high-voltage interlock signal according to the present invention includes the following steps:
s10 high-voltage interlock detection circuit output terminal system 30 and high-voltage interlock detection circuit input terminal system 40 are connected to micro control unit 10 and high-voltage interlock loop 20.
S20 the high voltage interlock detection circuit output system 30 and the high voltage interlock detection circuit input system 40 detect the current signal flowing through the high voltage interlock loop 20 and display it in the micro control unit 10 as a voltage signal.
S30 identifies a current condition of the high voltage interlock loop 20 from the voltage signal to identify a fault condition of the high voltage interlock loop 20.
Specifically, the fault state of the high-voltage interlock loop 20 includes a normal state, an open state, a short-circuit state of the high-voltage interlock detection circuit output end system 30 to the battery power supply, a short-circuit state of the high-voltage interlock detection circuit output end system 30 to ground, a short-circuit state of the high-voltage interlock detection circuit input end system 40 to the battery power supply, a short-circuit state of the high-voltage interlock detection circuit input end system 40 to ground, a short-circuit state of the high-voltage interlock loop 20 but to the battery power supply and a short-circuit state of the high-voltage interlock loop 20 but to. Wherein,
when the micro control unit 10 displays that the currents of the high-voltage interlock detection circuit output end system 30 and the high-voltage interlock detection circuit input end system 40 are both positive currents, it is identified that the high-voltage interlock loop 20 is in a normal state.
When the micro control unit 10 displays that the currents of the high-voltage interlock detection circuit output end system 30 and the high-voltage interlock detection circuit input end system 40 detected that the currents of the high-voltage interlock loop 20 are both 0, it is identified that the high-voltage interlock loop 20 is in an open circuit state.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit output end system 30 detected the high-voltage interlock loop 20 is a negative current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is 0, it is identified that the high-voltage interlock loop 20 is in a short-circuit state of the high-voltage interlock detection circuit output end system 30 to the storage battery power supply.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit output end system 30 detected that the current of the high-voltage interlock loop 20 is a positive current, and simultaneously the high-voltage interlock detection circuit input end system 40 detected that the current of the high-voltage interlock loop 20 is 0, it is identified that the high-voltage interlock loop 20 is in a short circuit state to ground of the high-voltage interlock detection circuit output end system 30.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit output end system 30 is 0, and meanwhile, the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock detection circuit 20 is a positive current, it is identified that the high-voltage interlock detection circuit 20 is in a short-circuit state to the storage battery power supply by the high-voltage interlock detection circuit input end system 40.
When the micro control unit 10 displays that the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit output end system 30 is 0 and the current of the high-voltage interlock detection circuit 20 detected by the high-voltage interlock detection circuit input end system 40 is a negative current, it is identified that the high-voltage interlock detection circuit 20 is in a short circuit state to ground of the high-voltage interlock detection circuit input end system 40.
When the micro control unit 10 displays that the current of the high-voltage interlock loop 20 detected by the high-voltage interlock detection circuit output end system 30 is a negative current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is a positive current, it is identified that the high-voltage interlock loop 20 is in a state of high-voltage interlock loop communication but short circuit to the storage battery power supply.
When the micro control unit 10 displays that the current of the high-voltage interlock loop 20 detected by the high-voltage interlock detection circuit output end system 30 is a positive current, and simultaneously the high-voltage interlock detection circuit input end system 40 detects that the current of the high-voltage interlock loop 20 is a negative current, it is identified that the high-voltage interlock loop 20 is in a high-voltage interlock loop communication state but in a short-circuit state to the ground.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (8)

1. A high-voltage interlock detection circuit integrated in a battery management system of an electric vehicle includes:
the micro control unit is provided with a plurality of interfaces;
a high voltage interlock loop including an input and an output;
one end of the output end system of the high-voltage interlocking detection circuit is connected with any two interfaces of the plurality of interfaces of the micro control unit, and the other end of the output end system of the high-voltage interlocking detection circuit is connected with the input end of the high-voltage interlocking loop; and
one end of the input end system of the high-voltage interlocking detection circuit is connected with two interfaces of the rest of the interfaces of the micro control unit, and the other end of the input end system of the high-voltage interlocking detection circuit is connected with the output end of the high-voltage interlocking loop;
the high-voltage interlocking detection circuit input end system and the high-voltage interlocking detection circuit output end system realize the detection of high-voltage interlocking signals by detecting current signals on the high-voltage interlocking loop and accurately position the fault state of the high-voltage interlocking loop;
the high-voltage interlocking detection circuit output end system comprises:
a first voltage source;
a first detection resistor including a first terminal and a second terminal, the first terminal being connected to the first voltage source;
a first current direction detection circuit, including a first input terminal and a first output terminal, where the first input terminal is connected to the first terminal and the second terminal of the first detection resistor, the first output terminal is connected to a first interface of the micro control unit, and the first current direction detection circuit is configured to detect a current flowing from the first terminal to the second terminal of the first detection resistor; and
a second current direction detection circuit, which includes a second input terminal and a second output terminal, wherein the second input terminal is connected to the first terminal and the second terminal of the first detection resistor, and the second output terminal is connected to a second interface of the micro control unit; the second current direction detection circuit is used for detecting the current flowing from the second end to the first end of the first detection resistor;
the high-voltage interlock detection circuit input end system comprises:
a second voltage source;
the second detection resistor comprises a third end and a fourth end, and the third end is connected with the second voltage source;
a third current direction detection circuit, including a third input terminal and a third output terminal, where the third input terminal is connected to the third terminal and the fourth terminal of the second detection resistor, the third output terminal is connected to a third interface of the micro control unit, and the third current direction detection circuit is configured to detect a current flowing from the fourth terminal to the third terminal of the second detection resistor; and
a fourth current direction detection circuit, including a fourth input terminal and a fourth output terminal, where the fourth input terminal is connected to the third terminal and the fourth terminal of the second detection resistor, the fourth output terminal is connected to a fourth interface of the micro control unit, and the fourth current direction detection circuit is configured to detect a current flowing from the third terminal to the fourth terminal of the second detection resistor;
the first current direction detection circuit, the second current direction detection circuit, the third current direction detection circuit and the fourth current direction detection circuit are respectively connected with the micro control unit, and the current direction flowing through the first detection resistor and the second detection resistor is judged through the voltage signal of the micro control unit, so that the current signal flowing through the high-voltage interlocking loop is judged, and the fault state of the high-voltage interlocking loop is accurately positioned.
2. The high voltage interlock detection circuit according to claim 1,
the first current direction detection circuit includes: the circuit comprises a first operational amplifier, a first resistor, a second resistor and a first diode; wherein,
the first operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the first operational amplifier is connected with the first end of the first detection resistor and the first voltage source, the reverse input end of the first operational amplifier is connected with the second end, and the output end of the first operational amplifier is connected with one end of the first resistor; the other end of the first resistor is respectively connected with one end of the second resistor, one end of the first diode and a first interface of the micro control unit; the other end of the second resistor is connected with the other end of the first diode and grounded;
the second current direction detection circuit includes: the second operational amplifier, the third resistor, the fourth resistor and the second diode; wherein,
the second operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the second operational amplifier is connected with the second end of the first detection resistor, the reverse input end of the second operational amplifier is connected with the first end and the first voltage source, and the output end of the second operational amplifier is connected with one end of the third resistor; the other end of the third resistor is respectively connected with one end of the fourth resistor, one end of the second diode and a second interface of the micro control unit; the other end of the fourth resistor and the other end of the second diode are connected and grounded.
3. The high voltage interlock detection circuit according to claim 2,
the third current direction detection circuit includes: a third operational amplifier, a fifth resistor, a sixth resistor and a third diode; wherein,
the third operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the third operational amplifier is connected with the fourth end of the second detection resistor, the reverse input end of the third operational amplifier is connected with the first end of the second detection resistor and the second voltage source, and the output end of the third operational amplifier is connected with one end of the fifth resistor; the other end of the fifth resistor is respectively connected with one end of the sixth resistor, one end of the third diode and a third interface of the micro control unit; the other end of the sixth resistor and the other end of the third diode are connected and grounded;
the fourth current direction detection circuit includes: a fourth operational amplifier, a seventh resistor, an eighth resistor, and a fourth diode; wherein,
the fourth operational amplifier comprises a forward input end, a reverse input end and an output end, the forward input end of the fourth operational amplifier is connected with the first end of the second detection resistor, the reverse input end of the fourth operational amplifier is connected with the second end of the second detection resistor and the second voltage source, and the output end of the fourth operational amplifier is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the eighth resistor, one end of the fourth diode and a fourth interface of the micro control unit respectively; the other end of the eighth resistor and the other end of the fourth diode are connected and grounded.
4. The high voltage interlock detection circuit of claim 3,
the high-voltage interlocking loop comprises a battery pack high-voltage connector, a maintenance switch and a high-voltage electric equipment connector which are sequentially connected, and the high-voltage interlocking detection circuit output end system, the micro control unit and the high-voltage interlocking detection circuit input end system are sequentially connected to form a series circuit.
5. The high voltage interlock detection circuit of claim 4,
when the first operational amplifier detects that current flows from the first end to the second end of the first detection resistor, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop, and the voltage displayed at the first interface of the micro control unit is positive voltage, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is positive current;
when the first operational amplifier detects that current flows from the second end to the first end of the first detection resistor or no current exists, namely the current flows from the output end of the high-voltage interlocking loop to the input end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the first interface of the micro control unit is 0, and at the moment, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0;
when the second operational amplifier detects that current flows from the first end to the second end of the first detection resistor or no current exists, namely the current flows from the input end of the high-voltage interlocking loop to the output end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the second interface of the micro control unit is 0, and at the moment, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0; when the second operational amplifier detects that current flows from the second end to the first end of the first detection resistor, namely the current flows from the output end of the high-voltage interlocking loop to the input end after passing through the high-voltage interlocking loop, and the voltage displayed at the second interface of the micro control unit is positive voltage, the output end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is negative current;
when the third operational amplifier detects that current flows from the third end to the fourth end of the second detection resistor or no current exists, namely the current flows from the output end of the high-voltage interlocking loop to the input end or no current exists in the high-voltage interlocking loop after passing through the high-voltage interlocking loop, the voltage displayed at the third interface of the micro control unit is 0, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0; when the third operational amplifier detects that current flows from the fourth end to the third end of the second detection resistor, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop, and the voltage displayed at the third interface of the micro control unit is positive voltage, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is positive current;
when the fourth operational amplifier detects that current flows from the third end to the fourth end of the second detection resistor, namely the current flows from the output end of the high-voltage interlocking loop to the input end after passing through the high-voltage interlocking loop, the voltage displayed at the fourth interface of the micro control unit is positive voltage, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is negative current; when the fourth operational amplifier detects that current flows from the fourth end to the third end of the second detection resistor or no current exists, namely the current flows from the input end of the high-voltage interlocking loop to the output end after passing through the high-voltage interlocking loop or no current exists in the high-voltage interlocking loop, the voltage displayed at the fourth interface of the micro control unit is 0, and at the moment, the input end system of the high-voltage interlocking detection circuit is identified to detect that the current in the high-voltage interlocking loop is 0.
6. The high voltage interlock detection circuit of claim 5,
the fault state of the high-voltage interlocking circuit comprises a normal state, an open-circuit state, a short-circuit state of a high-voltage interlocking detection circuit output end system to a storage battery power supply, a ground short-circuit state of the high-voltage interlocking detection circuit output end system, a short-circuit state of a high-voltage interlocking detection circuit input end system to the storage battery power supply, a ground short-circuit state of the high-voltage interlocking detection circuit input end system, and a state that the high-voltage interlocking circuit is communicated but the storage battery power supply short-circuit state and the high-voltage interlocking circuit; wherein,
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both positive currents, the high-voltage interlocking loop is identified to be in a normal state;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both 0, the high-voltage interlocking loop is identified to be in an open circuit state;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is negative current, and meanwhile, the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, the high-voltage interlocking loop is identified as a short-circuit state of the high-voltage interlocking detection circuit output end system to the storage battery power supply;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, identifying that the high-voltage interlocking loop is in a ground short circuit state of the high-voltage interlocking detection circuit output end system;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is a positive current, the high-voltage interlocking loop is identified as a short-circuit state of the input end system of the high-voltage interlocking detection circuit on a storage battery power supply;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current, the high-voltage interlocking loop is identified as a ground short circuit state of the input end system of the high-voltage interlocking detection circuit;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is positive current, the high-voltage interlocking loop is identified to be in a state that the high-voltage interlocking loop is communicated but short-circuited to a power supply of a storage battery;
and when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is a negative current, identifying that the high-voltage interlocking loop is in a state of high-voltage interlocking loop communication but short circuit to the ground.
7. A high-voltage interlocking signal detection method comprises the following steps:
the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit are connected with the micro control unit and the high-voltage interlocking loop;
the high-voltage interlocking detection circuit output end system and the high-voltage interlocking detection circuit input end system detect current signals flowing through the high-voltage interlocking loop and display the current signals in the micro control unit in the form of voltage signals;
identifying the current condition of the high-voltage interlocking loop according to the voltage signal so as to identify the fault state of the high-voltage interlocking loop;
wherein, high-pressure interlocking detection circuitry output end system includes:
a first voltage source;
a first detection resistor including a first terminal and a second terminal, the first terminal being connected to the first voltage source;
a first current direction detection circuit, including a first input terminal and a first output terminal, where the first input terminal is connected to the first terminal and the second terminal of the first detection resistor, the first output terminal is connected to a first interface of the micro control unit, and the first current direction detection circuit is configured to detect a current flowing from the first terminal to the second terminal of the first detection resistor; and
a second current direction detection circuit, which includes a second input terminal and a second output terminal, wherein the second input terminal is connected to the first terminal and the second terminal of the first detection resistor, and the second output terminal is connected to a second interface of the micro control unit; the second current direction detection circuit is used for detecting the current flowing from the second end to the first end of the first detection resistor;
the high-voltage interlock detection circuit input end system comprises:
a second voltage source;
the second detection resistor comprises a third end and a fourth end, and the third end is connected with the second voltage source;
a third current direction detection circuit, including a third input terminal and a third output terminal, where the third input terminal is connected to the third terminal and the fourth terminal of the second detection resistor, the third output terminal is connected to a third interface of the micro control unit, and the third current direction detection circuit is configured to detect a current flowing from the fourth terminal to the third terminal of the second detection resistor; and
and the fourth current direction detection circuit comprises a fourth input end and a fourth output end, the fourth input end is connected with the third end and the fourth end of the second detection resistor, the fourth output end is connected with a fourth interface of the micro control unit, and the fourth current direction detection circuit is used for detecting the current flowing from the third end to the fourth end of the second detection resistor.
8. The high voltage interlock signal detection method according to claim 7,
the fault state of the high-voltage interlocking circuit comprises a normal state, an open-circuit state, a short-circuit state of a high-voltage interlocking detection circuit output end system to a storage battery power supply, a ground short-circuit state of the high-voltage interlocking detection circuit output end system, a short-circuit state of a high-voltage interlocking detection circuit input end system to the storage battery power supply, a ground short-circuit state of the high-voltage interlocking detection circuit input end system, and a state that the high-voltage interlocking circuit is communicated but the storage battery power supply short-circuit state and the high-voltage interlocking circuit; wherein,
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both positive currents, the high-voltage interlocking loop is identified to be in a normal state;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit and the input end system of the high-voltage interlocking detection circuit detect that the currents of the high-voltage interlocking loop are both 0, the high-voltage interlocking loop is identified to be in an open circuit state;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is negative current, and meanwhile, the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, the high-voltage interlocking loop is identified as a short-circuit state of the high-voltage interlocking detection circuit output end system to the storage battery power supply;
when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is 0, identifying that the high-voltage interlocking loop is in a ground short circuit state of the high-voltage interlocking detection circuit output end system;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is a positive current, the high-voltage interlocking loop is identified as a short-circuit state of the input end system of the high-voltage interlocking detection circuit on a storage battery power supply;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is 0 and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current, the high-voltage interlocking loop is identified as a ground short circuit state of the input end system of the high-voltage interlocking detection circuit;
when the micro control unit displays that the output end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is negative current and the input end system of the high-voltage interlocking detection circuit detects that the current of the high-voltage interlocking loop is positive current, the high-voltage interlocking loop is identified to be in a state that the high-voltage interlocking loop is communicated but short-circuited to a power supply of a storage battery;
and when the micro control unit displays that the high-voltage interlocking detection circuit output end system detects that the current of the high-voltage interlocking loop is a positive current and the high-voltage interlocking detection circuit input end system detects that the current of the high-voltage interlocking loop is a negative current, identifying that the high-voltage interlocking loop is in a state of high-voltage interlocking loop communication but short circuit to the ground.
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CN109782160A (en) * 2019-02-25 2019-05-21 宁德时代新能源科技股份有限公司 High-voltage interlocking circuit and detection method thereof
CN110967616B (en) * 2019-02-25 2021-10-01 宁德时代新能源科技股份有限公司 High-voltage interlocking system and detection method thereof
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