CN107733039B - Detection device and method for charger of automobile - Google Patents
Detection device and method for charger of automobile Download PDFInfo
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- CN107733039B CN107733039B CN201711117194.3A CN201711117194A CN107733039B CN 107733039 B CN107733039 B CN 107733039B CN 201711117194 A CN201711117194 A CN 201711117194A CN 107733039 B CN107733039 B CN 107733039B
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- 238000001514 detection method Methods 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title abstract description 10
- 230000005669 field effect Effects 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
Classifications
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- H02J7/0021—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
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- H02J7/0026—
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- H02J7/0027—
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- H02J7/0077—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the invention provides a detection device and method for a charger of an automobile, and belongs to the field of automobiles. The detection method comprises the following steps: detecting the plugging state of a plug of the charging gun and generating a first detection signal and a second detection signal; judging whether the plug of the charging gun is completely inserted or not according to the first detection signal; starting the processor under the condition that the plug of the charging gun is judged to be completely inserted; the processor controls the feedback unit to adjust the voltage of the output end of the charging gun; the processor detects whether a pulse bandwidth modulation (PWM) signal is output at the output end of the charging gun; starting a direct current charging mode of the automobile under the condition that the PWM signal is not detected; in the event that a PWM signal is detected, an ac charging mode of the vehicle is initiated: the processor judges the capacity of the cable of the charging gun according to the second detection signal; the processor judges the output power of the charging gun according to the duty ratio of the PWM signal; the processor adjusts the charging current of the charger of the automobile according to the capacity and the output power of the cable.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a detection device and method for a charger of an automobile.
Background
With the increasing of the quantity of fuel automobiles, the environmental problems such as haze, climate warming and the like are increasingly aggravated, and meanwhile, with the increasing decrease of petroleum storage quantity, the environmental pollution and the energy shortage are double problems facing the current automobile industry. Under the condition, the electric automobile has the advantages of no pollution, high energy utilization rate, low noise and the like, and becomes the best choice for the climate warming and environmental pollution of various countries and realizes green development. Meanwhile, as various technologies of the new energy automobile are gradually matured, the new energy automobile is popularized, and compared with the fuel automobile, the fuel automobile has gradually embodied the economical efficiency, and the fuel automobile schedule is released and eliminated in various countries so as to support the development of the new energy automobile.
The power battery is used as a main power source of the electric automobile and bears all or part of power output of the electric automobile. The safety problem is always the focus of people, and the charging safety is an important precondition for ensuring the safe use of the power battery, so that the safe charging of the power battery is crucial to the safe operation of the electric automobile.
At present, the charging pile is charged with large voltage, and if the connection fails during charging, the battery can be damaged, and great potential safety hazards can exist. Therefore, the charging gun connection must be monitored and confirmed. Through designing an electric automobile rifle connection monitoring circuit that charges, can effectively avoid taking place accidents such as personnel's electric shock, equipment burning, guarantee to electric automobile and user's safety when charging.
The existing AC/DC charging safety monitoring scheme generally adopts two independent circuits, so that the scheme is low in universality, and the two circuits necessarily need more components, so that the cost is increased. Meanwhile, newly released connecting device for electric automobile conduction charging further refines safety protection measures of a direct current charging vehicle end interface, increases the variety of rated values of an alternating current-direct current charging interface, and clearly prohibits unsafe charging mode application. In this case, the drawbacks of the existing charge safety monitoring schemes are gradually revealed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a detection device for a charger of an automobile, which can integrate an alternating current-direct current charging circuit of the automobile into one circuit, thereby saving the design cost of the charging circuit of the automobile.
In order to achieve the above object, an aspect of embodiments of the present invention provides a detection method of a charger for an automobile, which may include:
Detecting the plugging state of a plug of the charging gun and generating a first detection signal and a second detection signal;
judging whether the plug of the charging gun is completely inserted or not according to the first detection signal;
Starting the processor under the condition that the plug of the charging gun is judged to be completely inserted;
The processor controls the feedback unit to adjust the voltage of the output end of the charging gun;
the processor detects whether a pulse bandwidth modulation (PWM) signal is output at the output end of the charging gun;
the processor starts a direct current charging mode of the automobile under the condition that the PWM signal is not detected;
The processor starts an alternating current charging mode of the automobile under the condition that the PWM signal is detected;
after the ac charging mode is started:
the processor judges the capacity of the cable of the charging gun according to the second detection signal;
the processor judges the output power of the charging gun according to the duty ratio of the PWM signal;
And the processor sends a signal to a charger of the automobile according to the capacity and the output power of the cable so that the charger can adjust the charging current.
In order to achieve the above object, another aspect of the embodiments of the present invention provides a detection apparatus for a charger of an automobile, which may include: the detection unit is used for detecting the plugging state of the plug of the charging gun and generating a first detection signal, and the first detection signal indicates that the plug of the charging gun is completely plugged; a voltage comparing unit for transmitting a wake-up signal in case of receiving the first detection signal; the first controllable switch is used for switching on a power supply of the processor under the condition of receiving the wake-up signal; the feedback unit is used for adjusting the voltage of the output end of the charging gun to inform the charging gun that the automobile can start charging; a processor for, in case of receiving a wake-up signal: controlling the feedback unit to regulate the voltage of the output terminal; detecting whether a PWM signal is output at the output end of the charging gun; under the condition that the output end of the charging gun is detected to have PWM signal output, starting an alternating current charging mode of the automobile; and under the condition that no PWM signal is output at the output end of the charging gun, starting a direct current charging mode of the automobile.
Optionally, the detecting unit may include a first driving power source and a voltage dividing resistor, one end of the first driving power source is connected with one end of the voltage dividing resistor, the plug of the charging gun includes a detecting resistor, the other end of the voltage dividing resistor is connected with one end of the detecting resistor when the plug of the charging gun is plugged, the other end of the detecting resistor is grounded when the plug of the charging gun is plugged, and the other end of the voltage dividing resistor is used for outputting a first detecting signal.
Optionally, the voltage comparing unit may include a second driving power source, a voltage comparator, a second controllable switch, and a third driving power source; the second driving power supply is connected with the inverting input end of the voltage comparator, the non-inverting input end of the voltage comparator is connected with the other end of the voltage dividing resistor, and the output end of the voltage comparator is connected with the second controllable switch and used for conducting the second controllable switch when the voltage comparator receives the first detection signal so that the third driving power supply outputs a wake-up signal.
Optionally, the detection device may further include: and the voltage conversion unit is used for converting the first PWM signal of the output end of the charging gun into a second PWM signal suitable for the processor.
Alternatively, the voltage conversion unit may include: the device comprises a diode, a first field effect transistor, a first triode and a fourth driving power supply, wherein the anode of the diode is connected with a charging gun when a plug of the charging gun is inserted, the grid electrode of the first field effect transistor is connected with the cathode of the diode, the source electrode of the first field effect transistor is grounded, the drain electrode of the first field effect transistor is connected with the base electrode of the first triode, the emitter electrode of the first triode is connected with the fourth driving power supply, and the collector electrode of the first triode is connected with the processor.
Optionally, the other end of the divider resistor may be further used for outputting a second detection signal when the plug of the charging gun is plugged in, and the processor is connected with the other end of the divider resistor and further used for determining the capacity of the cable of the charging gun according to the second detection signal.
Optionally, the detection device may further include: and the voltage follower is connected between the processor and the other end of the divider resistor and used for isolating the mutual interference of voltages at two ends of the voltage follower.
Optionally, the processor may be configured to: determining the output power of the charging gun according to the second PWM signal; and sending a signal to a charger of the automobile according to the output power and the capacity of the cable so that the charger can adjust the charging current.
Alternatively, the feedback unit may include: the device comprises a fifth driving power supply, a second triode and a second field effect transistor, wherein the base electrode of the second triode is connected with the processor, the emitting electrode of the second triode is connected with the fifth driving power supply, the collecting electrode of the second triode is connected with the grid electrode of the second field effect transistor, the source electrode of the second field effect transistor is grounded, and the drain electrode of the second field effect transistor is connected with the cathode of the diode.
Through the technical scheme, the detection device can integrate the AC/DC charging circuit of the automobile into one circuit, so that the design cost of the charging circuit of the automobile is saved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method of detecting a charger for an automobile according to an embodiment of the present invention;
FIG. 2 is a block diagram of a detection unit according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a detection device for a charger of an automobile according to an embodiment of the present invention;
Fig. 4 is a schematic structural view of a detection device for a charger of an automobile according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a detection device for a charger of an automobile according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a detection device for a charger of an automobile according to an embodiment of the present invention; and
Fig. 7 is a schematic structural view of a detection device for a charger of an automobile according to an embodiment of the present invention.
Description of the reference numerals
S1, a first driving power supply S2 and a second driving power supply
S3, a third driving power supply S4 and a fourth driving power supply
S5, fifth driving power supply 1 and detection unit
2. Voltage comparing unit 3, feedback unit
4. Processor M1, first field effect transistor
M2, a second field effect transistor D1 and a diode
R0, a first voltage dividing resistor RC and a detection resistor
R1, a first resistor R2 and a second resistor
R3, third resistor R4 and fourth resistor
R5, fifth resistor R6 and sixth resistor
R7, seventh resistor R8, eighth resistor
R9, a ninth resistor R10 and a tenth resistor
R11, eleventh resistor R12, twelfth resistor
VF, voltage follower U1 and voltage comparator
K1, a first controllable switch K2 and a second controllable switch
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Fig. 1 is a flowchart of a method of detecting a charger for an automobile according to an embodiment of the present invention. In fig. 1, the detection method may include:
In step S10, the plugging state of the plug of the charging gun is detected and a first detection signal and a second detection signal are generated. In this embodiment, a detection circuit may be provided in advance, where the detection circuit includes a voltage dividing resistor and a driving power source, the driving power source is connected to one end of the voltage dividing resistor, the other end of the voltage dividing resistor is connected to one end of a detection resistor provided on the plug when the plug is plugged, and the other end of the detection resistor is grounded. When the plug is plugged in, a first detection signal and a second detection signal are generated by detecting the voltage at the other end of the voltage dividing resistor. In one example of the present invention, the first detection signal may be a reduced value of the voltage at the other end of the voltage dividing resistor with respect to the voltage before the plug is plugged in, and the second detection signal may be a voltage value at the other end of the voltage dividing resistor.
In step S20, it is determined whether the plug of the charging gun is completely plugged according to the first detection signal. In this embodiment, the first detection signal may be a reduced value of the voltage at the other end of the voltage dividing resistor before the voltage dividing resistor is connected. When the voltage at the other end of the voltage dividing resistor is judged to be reduced to a preset voltage value, the plug of the charging gun is completely plugged.
In step S30, if it is determined that the plug of the charging gun has been completely plugged, the processor is started, and the processor starts the charger of the automobile to perform the system self-test.
In step S40, the charger of the car determines whether the car can start charging. When the vehicle is able to start charging, the vehicle's charger sends a feedback signal to the processor. After the processor receives the feedback signal, the voltage of the output end of the charging gun is adjusted through a feedback unit connected between the processor and the output end of the charging gun. After the charging gun detects the voltage reduction of the output end, the automobile is judged to be capable of starting charging.
In step S50, it is detected whether or not a PWM signal is output from the output terminal of the charging gun. The processor detects whether a PWM signal is output from the output end of the charging gun. In this embodiment, if the charging gun is an ac charging gun, the output terminal will have PWM signal output; if the charging gun is a DC charging gun, then the output terminal will not have PWM signals output.
In step S60, the processor starts the dc charging mode of the charger if the PWM signal is not detected. In this embodiment, the processor does not detect the PWM signal output, and then indicates that the power source type of the output of the charging gun is dc power. Then the dc charging mode of the charger should be started at this time.
In step S70, the processor detects a PWM signal. The ac charging mode of the car is started. In this embodiment, the processor detects the PWM signal, and determines that the power supply of the charging gun is an ac power supply. The processor may then initiate an ac charging mode of the vehicle, for example by sending a signal to the vehicle controller, to begin an ac charging. In another example of the present invention, the processor may also be a vehicle controller, and then the processor may directly initiate an ac charging mode of the vehicle to begin ac charging.
In step S80, in the case of starting the ac charging mode, the processor determines the output power of the charging gun according to the duty ratio of the received PWM signal. The calculation method for calculating the output power of the charging gun by the processor may be known to those skilled in the art, and will not be described herein.
In step S90, the capacity of the cable of the charging gun is determined based on the second detection signal. The capacity may be the maximum current that the cable can pass. In one example of the present invention, the judgment rule may be, for example, a rule shown in table 1.
TABLE 1
The corresponding rules shown in table 1 are formulated according to the corresponding national standard documents, and are only limited to explain the technical scheme of the invention, and do not limit the protection scope of the invention. .
In step S11, the processor sends a signal to a charger of the vehicle according to the output power of the charging gun and the capacity of the cable so that the charger adjusts the magnitude of the charging current. In this embodiment, the maximum charging current of the charger may be determined by comparing the output power with the capacity of the cable. The maximum charging current may be a smaller value of the output power and capacity. In this way, the situation of over-current of the cable (over-current passing) or insufficient output power of the charger can be avoided. In addition, the adjustment process and the PWM signal detection process may be performed at regular time intervals during the charging of the vehicle. Preferably, the time period may be 5 seconds.
The invention further provides a detection device for the charger of the automobile. As shown in fig. 2, the detection device may include a detection unit 1, a voltage comparison unit 2, a first controllable switch K1, a feedback unit 3, and a processor 4. The detection unit 1 may be used to detect the plugging state of the plug of the charging gun and to generate a first detection signal indicating whether the plug of the charging gun is fully plugged. The voltage comparing unit 2 is configured to send a wake-up signal when receiving the first detection signal. The first controllable switch K1 is connected to a power supply circuit of the processor 4 for switching on the power supply of the processor 4 when a wake-up signal is received via the port a so that the processor 4 is started. This avoids the problem of the processor 4 wasting power by maintaining a state that is started at the moment. The feedback unit 3 is used to regulate the voltage at the output of the charging gun. The processor 4 is configured to, in case a wake-up signal is received via port B: controlling the feedback unit 3 to regulate the voltage at the output (CP) of the charging gun; detecting whether a PWM signal is output at the output end of the charging gun through a port D; under the condition that the output end of the charging gun is detected to have PWM signal output, starting an alternating current charging mode of the automobile; and under the condition that no PWM signal is output at the output end of the charging gun, starting a direct current charging mode of the automobile.
In one embodiment of the present invention, as shown in fig. 3, the detection unit 1 may include a first driving power source S1 and a voltage dividing resistor R0. The first driving power source S1 is connected to one end of the voltage dividing resistor R0, and the plug of the charging gun may include a detection resistor RC, and when the plug of the charging gun is not plugged, the other end of the voltage dividing resistor R0 and the ground terminal are disconnected. When the plug of the charging gun is plugged, the other end of the voltage dividing resistor R0 is connected with one end of the detection resistor RC, and the other end of the detection resistor RC is grounded. The other end of the voltage dividing resistor R0 (a node between the voltage dividing resistor R0 and the detection resistor RC) is used to output the first detection signal (i.e., the other end of the voltage dividing resistor R0 is connected to the voltage comparing unit 2). The first detection signal may be, for example, a voltage at the other end of the voltage dividing resistor R0. When the plug of the charging gun is not plugged, since the voltage dividing resistor R0 is disconnected from the ground terminal at this time, the voltage value of the other end of the voltage dividing resistor R0 is the voltage value of the first driving power source S1 (in the embodiment of the present invention, the voltage value of the first driving power source S1 may be +12v). When the plug of the charging gun is plugged, the other end of the voltage dividing resistor R0 is connected with one end of the detection resistor RC, and the other end of the detection resistor is grounded. Then, at this time, the voltage value of the node between the voltage dividing resistor R0 and the detection resistor RC is reduced to a predetermined voltage value, and the first detection signal may be whether the voltage value of the node is reduced to a predetermined voltage value (when the first detection signal indicates that the voltage value of the node is not reduced to a predetermined voltage value, it is indicated that the plug of the charging gun is not completely plugged).
In one embodiment of the present invention, as shown in fig. 4, the voltage comparing unit 2 may include a second driving power source S2, a voltage comparator U1, a second controllable switch K2, a third driving power source S3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. In this embodiment, the second controllable switch K2 may be a triode. The second driving power source S2 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The node between the first resistor R1 and the second resistor R2 is connected to the inverting input terminal of the voltage comparator U1, and the non-inverting input terminal of the voltage comparator U1 is connected to the node between the voltage dividing resistor R0 and the detection resistor RC. The output end of the voltage comparator U1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with the base electrode of a second controllable switch K2, and the other end of the third resistor R3 is also connected with the emitter electrode of the second controllable switch K2. The emitter of the second controllable switch K2 is connected to the third driving power source S3, and the collector of the second controllable switch K2 is configured to output a wake-up signal to the first controllable switch K1 and the processor 4 through the port a and the port B, respectively. The collector of the second controllable switch K2 is further connected to one end of a fifth resistor R5, and the other end of the fifth resistor R5 is grounded. The non-inverting input terminal of the voltage comparator U1 is connected to the other end of the voltage dividing resistor R0, and the voltage comparator U1 outputs a low level when the voltage value at the other end of the voltage dividing resistor R0 decreases by a predetermined voltage value. At this time, the second controllable switch K2 is turned on, and the collector of the second controllable switch K2 outputs a high level (wake-up signal).
In one embodiment of the invention, the detection means may comprise a voltage conversion unit which may be used to convert the first PWM signal of the charging gun into a second PWM signal suitable for the processor 4. In one example of the invention, the first PWM signal may be a 12V PWM signal from a charging gun. The second PWM signal may be a 5V PWM signal suitable for the processor 4. As shown in fig. 5, the voltage conversion unit may include a diode D1, a first field effect transistor M1, a first transistor Q1, a fourth driving power source S4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The positive pole of the diode D1 is connected to the output terminal (CP) of the charging gun when the plug of the charging gun is plugged, the negative pole of the diode D1 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded. The cathode of the diode D1 is also connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is connected to the gate of the first field effect transistor M1. The source electrode of the first field effect transistor M1 is grounded, the drain electrode of the first field effect transistor M1 is connected with one end of an eighth resistor R8, and the other end of the eighth resistor R8 is connected with the base electrode of the first triode Q1. The base of the first triode Q1 is connected with one end of a ninth resistor R9, and the other end of the ninth resistor R9 is connected with the emitter of the first triode Q1. The emitter of the first triode Q1 is further connected to a fourth driving power supply S4, and the collector of the first triode Q1 is connected to the processor 4 for outputting PWM signals. The collector of the first triode Q1 is further connected to one end of a tenth resistor R10, and the other end of the tenth resistor R10 is grounded.
In this embodiment, as shown in fig. 6, the other end of the voltage dividing resistor R0 is further used to output a second detection signal when the plug of the charging gun is plugged in, and the second detection signal may be a voltage value of the other end of the voltage dividing resistor R0. The processor 4 is connected to the other end of the voltage dividing resistor R0, and is further configured to receive a second detection signal through the port C, and determine the capacity of the cable of the charging gun according to the second detection signal. In this embodiment, the processor 4 may obtain the voltage value of the other end of the voltage dividing resistor R0 through the second detection signal, and calculate the resistance value of the detection resistor RC according to the voltage value, thereby further judging the capacity of the cable of the charging gun according to a predetermined correspondence rule. The correspondence rule may be the correspondence rule shown in table 1. Preferably, a voltage follower VF may be further connected between the processor 4 and the other end of the voltage dividing resistor R0, the voltage follower VF is connected to one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is connected to one end of a twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded. The processor 4 is connected to the other end of the eleventh resistor R11. The voltage follower VF can block the mutual interference of the voltages at both ends of the voltage follower VF, thereby improving the accuracy of the processor 4 in determining the capacity of the cable by detecting the second detection signal.
In this embodiment, as shown in fig. 7, the feedback unit 3 may include: a fifth driving power source S5, a second triode Q2, a second field effect transistor M2, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15. One end of the thirteenth resistor R13 is connected to the processor 4 and is configured to receive a feedback signal from the processor 4. The other end of the thirteenth resistor R13 is connected with the base electrode of the second triode Q2, the base electrode of the second triode Q2 is connected with one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected with the emitting electrode of the second diode Q2, and the emitting electrode of the second triode Q2 is connected with the fifth power supply S5. The collector of the second triode Q2 is connected to one end of a fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to the gate of the second field effect transistor M2. The source of the second field effect transistor M2 is grounded, the drain of the second field effect transistor M2 is connected to one end of the sixteen resistor R16, and the other end of the sixteenth resistor R16 is connected to one end of the seventh resistor R7. When the processor 4 sends a low-level signal (feedback signal) to one end of the thirteenth resistor R13 through the port E, the second triode Q2 and the second fet M2 are turned on, so that the voltage output from the output end (CP) of the charging gun to the first fet M1 becomes low, at this time, it is explained that the self-test of the charger of the automobile is completed, and charging can be started.
When the plug of the charging gun is completely plugged, one end of the detection resistor RC is connected with the other end of the voltage dividing resistor R0. At this time, the voltage at the other end of the voltage dividing resistor R0 becomes low, so that the voltage comparator U1 outputs a low level to turn on the second controllable switch K2, so that the collector of the second controllable switch K2 outputs a wake-up signal of a high level. After the first controllable switch K1 receives the wake-up signal through the port a, the power supply of the processor 4 is turned on, and the processor 4 is started. After receiving the wake-up signal through the port B, the processor 4 starts a charger of the automobile to perform system self-test. After the self-checking of the charger is completed, a feedback signal is sent to the processor 4. After receiving the feedback signal, the processor 4 outputs a low level signal to the base of the second transistor Q2 through the port E. At this time, the second triode Q2 and the second fet M2 are turned on, so that the voltage output from the output terminal CP of the charging gun to the first fet M1 becomes low, and at this time, it is indicated that the vehicle can start charging. The charging gun detects a low voltage, starts outputting a PWM signal through the output terminal and starts charging the car. The processor 4 detects the PWM signal through port D. In case no PWM signal is detected, the processor 4 starts the dc charging mode of the car. In case the PWM signal is detected, the processor 4 initiates an ac charging mode of the car. In the ac charging mode of the car, the processor 4 receives the second detection signal through the port C and determines the capacity of the cable of the charging gun according to the judgment rules shown in table 1. At the same time, the processor 4 also calculates the output power of the charging gun from the duty cycle of the PWM signal. The processor 4 combines the capacity of the cable and the output power of the charging gun to send a signal to the charger of the automobile so that the charger regulates the charging current, and the problems of overcurrent of the cable and insufficient output power of the charging gun are avoided.
Through the technical scheme, the detection device and the detection method for the automobile charger can combine the AC and DC charging circuits on the traditional automobile, so that the design cost is saved, and the working efficiency is improved. Meanwhile, when the charging gun charges the automobile, the charging current is adjusted in real time by comparing the capacity of the cable with the output power of the charging gun, so that the occurrence of safety accidents is avoided, and the safety coefficient of a charger of the automobile is improved.
The above description of the alternative embodiments of the present invention with reference to the accompanying drawings is given in detail, but the embodiments of the present invention are not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present invention within the scope of the technical concept of the embodiments of the present invention, and all the simple modifications belong to the protection scope of the embodiments of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations of embodiments of the invention are not described in detail.
Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, including instructions for causing a (e.g., single-chip, etc.) or processor (processor) to perform all or part of the steps in the methods of the embodiments of the application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In addition, any combination of the various embodiments of the present invention may be made between the various embodiments, and should also be regarded as disclosed in the embodiments of the present invention as long as it does not deviate from the idea of the embodiments of the present invention.
Claims (7)
1. A detection device for a charger of an automobile, the detection device comprising:
The detection unit is used for detecting the plugging state of the plug of the charging gun and generating a first detection signal, and the first detection signal indicates that the plug of the charging gun is completely plugged;
a voltage comparing unit, configured to send a wake-up signal when the first detection signal is received;
The first controllable switch is used for switching on a power supply of the processor under the condition that the wake-up signal is received;
The feedback unit is used for adjusting the voltage of the output end of the charging gun to inform the charging gun that the automobile can start charging;
The processor is configured to, in a case where the wake-up signal is received:
Controlling the feedback unit to regulate the voltage of the output terminal;
Detecting whether PWM signals are output at the output end of the charging gun;
under the condition that the output end of the charging gun is detected to have PWM signal output, starting an alternating current charging mode of the automobile;
under the condition that no PWM signal is output at the output end of the charging gun, starting a direct current charging mode of the automobile;
The detection unit comprises a first driving power supply and a voltage dividing resistor, wherein the first driving power supply is connected with one end of the voltage dividing resistor, the plug of the charging gun comprises a detection resistor, the other end of the voltage dividing resistor is connected with one end of the detection resistor when the plug of the charging gun is plugged, the other end of the detection resistor is grounded when the plug of the charging gun is plugged, and the other end of the voltage dividing resistor is used for outputting the first detection signal;
The detection device further includes: a voltage conversion unit for converting a first PWM signal of an output terminal of the charging gun into a second PWM signal suitable for the processor; the voltage conversion unit includes: the device comprises a diode, a first field effect transistor, a first triode and a fourth driving power supply, wherein the anode of the diode is connected with a charging gun when a plug of the charging gun is inserted, the grid electrode of the first field effect transistor is connected with the cathode of the diode, the source electrode of the first field effect transistor is grounded, the drain electrode of the first field effect transistor is connected with the base electrode of the first triode, the emitter electrode of the first triode is connected with the fourth driving power supply, and the collector electrode of the first triode is connected with a processor.
2. The detection apparatus according to claim 1, wherein the voltage comparing unit includes a second driving power source, a voltage comparator, a second controllable switch, and a third driving power source; the second driving power supply is connected with the inverting input end of the voltage comparator, the non-inverting input end of the voltage comparator is connected with the other end of the voltage dividing resistor, and the output end of the voltage comparator is connected with the second controllable switch and used for conducting the second controllable switch when the voltage comparator receives the first detection signal so that the third driving power supply outputs the wake-up signal.
3. The detecting device according to claim 2, wherein the other end of the voltage dividing resistor is further used for outputting a second detection signal when the plug of the charging gun is plugged in, and the processor is connected with the other end of the voltage dividing resistor and further used for determining the capacity of the cable of the charging gun according to the second detection signal.
4. A detection apparatus according to claim 3, further comprising: the voltage follower is connected between the processor and the other end of the divider resistor and used for isolating mutual interference of voltages at two ends of the voltage follower.
5. The detection apparatus of claim 4, wherein the processor is configured to:
determining the output power of the charging gun according to the second PWM signal;
And sending a signal to a charger of the automobile according to the output power and the capacity of the cable so that the charger can adjust the charging current.
6. The apparatus according to claim 5, wherein the feedback unit includes: the device comprises a processor, a fifth driving power supply, a second triode and a second field effect transistor, wherein the base electrode of the second triode is connected with the processor, the emitting electrode of the second triode is connected with the fifth driving power supply, the collecting electrode of the second triode is connected with the grid electrode of the second field effect transistor, the source electrode of the second field effect transistor is grounded, and the drain electrode of the second field effect transistor is connected with the cathode of the diode.
7. A detection method of a charger for an automobile for controlling the detection device according to any one of claims 1 to 6, characterized in that the detection method comprises:
Detecting the plugging state of a plug of the charging gun and generating a first detection signal and a second detection signal;
Judging whether the plug of the charging gun is completely inserted or not according to the first detection signal;
Starting a processor under the condition that the plug of the charging gun is judged to be completely inserted;
The processor controls a feedback unit to adjust the voltage of the output end of the charging gun so as to inform the charging gun that the automobile can start charging;
the processor detects whether a pulse bandwidth modulation (PWM) signal is output at the output end of the charging gun;
the processor starts a direct current charging mode of the automobile under the condition that the PWM signal is not detected;
The processor starts an alternating current charging mode of the automobile under the condition that the PWM signal is detected;
After the ac charging mode is started:
The processor judges the capacity of the cable of the charging gun according to the second detection signal;
The processor judges the output power of the charging gun according to the duty ratio of the PWM signal;
and the processor sends a signal to a charger of the automobile according to the capacity of the cable and the output power so that the charger can adjust the charging current.
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| CN110682847B (en) * | 2018-07-06 | 2025-02-07 | 刘慕华 | Mobile charging vehicle and mobile energy station |
| CN111835050A (en) * | 2019-04-22 | 2020-10-27 | 北京小米移动软件有限公司 | Charging terminal, method and device |
| US11128149B2 (en) * | 2019-08-13 | 2021-09-21 | Merry Electronics(Shenzhen) Co., Ltd. | Charging apparatus |
| CN111157796A (en) * | 2020-01-21 | 2020-05-15 | 深圳市鑫王牌科技发展有限公司 | An external device wake-up detection circuit, detection device and electronic product |
| CN111452640B (en) * | 2020-04-13 | 2023-04-28 | 北京和信瑞通电力技术股份有限公司 | Electric charging gun homing detection circuit and method |
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