CN108923386B - A kind of over current protecting self-locking circuit and air conditioner - Google Patents
A kind of over current protecting self-locking circuit and air conditioner Download PDFInfo
- Publication number
- CN108923386B CN108923386B CN201810975953.8A CN201810975953A CN108923386B CN 108923386 B CN108923386 B CN 108923386B CN 201810975953 A CN201810975953 A CN 201810975953A CN 108923386 B CN108923386 B CN 108923386B
- Authority
- CN
- China
- Prior art keywords
- comparator
- over current
- resistance
- locking circuit
- voltage value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000008859 change Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of over current protecting self-locking circuit and air conditioners; change unit by setting voltage; first comparator is set to be able to maintain the relative status of the level height of non-inverting input terminal and inverting input terminal after triggering overcurrent protection into the first level signal by high current; to keep the level state of the output end of first comparator; processor can be made to detect the protection signal of over-voltage or overcurrent in time, to implement protection to protect motor.Provided by the invention kind of over current protecting self-locking circuit avoids the loss repeatedly to power module that traditional current foldback circuit is easy to appear, and can be effectively protected motor, extends the service life of motor and air conditioner.
Description
Technical field
The present invention relates to current protection technology field, in particular to a kind of over current protecting self-locking circuit and air conditioner.
Background technique
Motor is the important component of air conditioner, is generated in order to avoid overcurrent occurs for motor to power module device or motor
Damage, is usually provided with current foldback circuit between existing hardware driving circuit and power module.The electricity of overcurrent protection simultaneously
Road and micro-control unit (MicrocontrollerUnit, MCU) are connected.The specific work process of overcurrent protection are as follows: sampling module
The voltage signal of sampled power module exports after enhanced processing to current foldback circuit, when detecting that the voltage signal is higher than
When protection point setting value, current foldback circuit generates protection signal and is exported respectively to hardware driving circuit and MCU, hardware driving electricity
Road make an immediate response rapidly in a short time switch-off power module driving output, while MCU fault detection Port detecting to this protect
Shield signal stops pwm signal processing immediately, and effective protection power module device and motor will not be damaged because of high current.
In practical applications, after overcurrent protection occurring, hardware driving circuit immediately turns off the driving output of power module, electricity
Machine stops immediately, and high current disappears immediately, and the protection signal of current foldback circuit also disappears immediately, will lead to MCU because having little time
It detects protection signal and pwm signal cannot be turned off, such motor can be under overcurrent impact-stopping-overcurrent impact conditions repeatedly
It is subjected to overcurrent impact.Because MCU effectively detects that protection signal is to need certain detection time, the guarantor of current foldback circuit
After protecting blackout, MCU can not effectively detect protection signal.
Summary of the invention
In view of this, the present invention is directed to propose a kind of over current protecting self-locking circuit and air conditioner, to solve the above problems.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
In a first aspect, the embodiment of the invention provides a kind of over current protecting self-locking circuit, the over current protecting self-locking circuit
It is electrically connected with a power module, the over current protecting self-locking circuit is also electrically connected with a Hardware drive module, the hardware driving
Module is electrically connected to drive the power module with the power module；The over current protecting self-locking circuit includes: the first signal
Processing module；First signal processing module includes that first comparator and voltage change unit, the first comparator
Non-inverting input terminal, the voltage change unit and the output end of the first comparator is sequentially connected electrically；
The first comparator is used to drop when the first voltage value of the inverting input terminal of the first comparator from a reference value
Down to be less than the first comparator non-inverting input terminal preset second voltage value when, pass through the defeated of first comparator
Outlet exports the first level signal；
The voltage change unit is used for will be described when the output end of the first comparator exports the first level signal
The voltage value of the non-inverting input terminal of first comparator changes into third voltage value, wherein the second voltage value is less than the base
Quasi- value, the third voltage value are greater than a reference value.
Further, first signal processing module further includes the first power supply, second resistance and 3rd resistor, and described
One power supply passes sequentially through second resistance and 3rd resistor ground connection, the non-inverting input terminal of the first comparator are connected to described second
To obtain second voltage value between resistance and the 3rd resistor.
Further, the inverting input terminal of the first comparator passes through first resistor R1 and sample circuit and the power
Module electrical connection, for obtaining the first voltage value.
Further, it includes second source, the 4th resistance and first diode, second electricity that the voltage, which changes unit,
Source, the 4th resistance, the output end of first comparator, first diode and the first comparator non-inverting input terminal be successively electrically connected
It connects.
Further, the output end of the first comparator is electrically connected with the Hardware drive module, when first ratio
When output end compared with device exports the first level signal, the Hardware drive module stops driving the power module so that described the
One voltage value is changed into a reference value.
Further, the over current protecting self-locking circuit includes second signal processing module, the first signal processing mould
Block and second signal processing module electrical connection, the second signal processing module are electrically connected with a processor, and described second
Signal processing module is used to generate fault-signal when first signal processing module generates the first level signal, and will be described
Fault-signal is sent to the processor.
Further, the second signal processing module includes the second comparator, the anti-phase input of second comparator
End is electrically connected with the output end of the first comparator, and second comparator is used for the anti-phase input when second comparator
4th voltage value at end generates fault-signal when being greater than preset five voltage value, and the fault-signal is sent to institute
State processor.
Further, the over current protecting self-locking circuit includes the second diode, and the output end of the first comparator is logical
It crosses second diode to be electrically connected with the processor, the processor unlocks for responding the fault-signal generation
Instruction, and the instruction that unlocks is exported to the output end of the first comparator, so that the first comparator is defeated
Outlet changes level state.
Further, the second signal processing module further includes third power supply, the 5th resistance and the 6th resistance, and described
Three power supplys pass sequentially through the 5th resistance and the 6th resistance eutral grounding, and the non-inverting input terminal of second comparator is connected to
To obtain the 5th voltage value between 5th resistance and the 6th resistance.
Second aspect, the embodiment of the invention provides a kind of air conditioner, the air conditioner include the overcurrent protection from
Lock circuit.
Compared with the existing technology, a kind of over current protecting self-locking circuit and air conditioner of the present invention have the advantage that
By setting voltage change unit, make first comparator by high current trigger generate the first level signal after still
The old high low state of level for keeping non-inverting input terminal and inverting input terminal can make to locate to keep the level state of output end
Reason device detects the protection signal of over-voltage or overcurrent in time, to implement to protect.Traditional current foldback circuit is avoided to be easy
The loss repeatedly to power module occurred can be effectively protected motor, extend the service life of motor and air conditioner.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the application scenarios schematic diagram of over current protecting self-locking circuit described in the embodiment of the present invention；
Fig. 2 is the schematic diagram of over current protecting self-locking circuit described in the embodiment of the present invention；
Fig. 3 shows the schematic diagram of air conditioner provided in this embodiment.
Appended drawing reference: 1- over current protecting self-locking circuit；11- sample circuit；The first signal processing module of 2-；3- second signal
Processing module；4- power module；5- Hardware drive module；6- processor；7- motor；8- air conditioner；U1- first comparator；U2-
Second comparator；R1- first resistor；R2- second resistance；R3- 3rd resistor；The 4th resistance of R4-；The 5th resistance of R5-；R6-
Six resistance；C1- first capacitor；The second capacitor of C2-；C3- third capacitor；The 4th capacitor of C4-；D1- first diode；D2- second
Diode.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity or
Operation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are any
This actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusive
Property include so that include a series of elements process, method, article or equipment not only include those elements, but also
Further include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described
There is also other identical elements in the process, method, article or equipment of element.
Existing current foldback circuit, hardware driving circuit immediately turns off the driving of power module after overcurrent protection occurs
Output, motor stops immediately, and high current disappears immediately, and the protection signal of current foldback circuit also disappears immediately, will lead to MCU because
Have little time to detect protection signal and pwm signal cannot be turned off, such motor can be in overcurrent impact-stopping-overcurrent impact conditions
Under be subjected to repeatedly overcurrent impact.Because MCU effectively detects that protection signal is to need certain detection time, overcurrent protection electricity
After the protection blackout on road, MCU can not effectively detect protection signal.
First embodiment
The present embodiment provides a kind of over current protecting self-locking circuits 1, make Hardware drive module 5 stop driving in triggering overcurrent protection
After dynamic power module 4, the over current protecting self-locking circuit 1 can continue output fault-signal, so that processor 6 be made to be able to detect
To the fault-signal, to implement more complete protection act.
Referring to Fig. 1, Fig. 1 shows the application scenarios schematic diagram of over current protecting self-locking circuit 1 provided in this embodiment, institute
Over current protecting self-locking circuit 1 is stated to be electrically connected with a power module 4, the over current protecting self-locking circuit 1 also with a hardware driving mould
Block 5 is electrically connected, and the Hardware drive module 5 is electrically connected to drive the power module 4 with the power module 4；The overcurrent
Protecting latching circuit 1 includes: the first signal processing module 2 and second signal processing module 3, the second signal processing module 3
It is electrically connected with a processor 6, first signal processing module 2 is used to be judged whether according to the signal of the power module 4 of sampling
Overcurrent protection is triggered, when triggering overcurrent protection, first signal processing module 2 exports the first level signal to the hardware
Drive module 5 makes the Hardware drive module 5 stop driving the power module 4, while stopping driving in Hardware drive module 5
After moving the power module 4, keep exporting first level signal, so that the second signal processing module 3 is according to described
First level signal generates fault-signal, and the fault-signal is sent to the processor 6.To 6 energy of processor
It is enough still to be able to detect fault-signal after the Hardware drive module 5 stops driving the power module 4.
Referring to Fig. 2, first signal processing module 2 includes first comparator U1, voltage change unit, the first electricity
Source, second source, second resistance R2 and the non-inverting input terminal of 3rd resistor R3, the first comparator U1, the voltage change
The output end of unit and the first comparator U1 are sequentially connected electrically.
The first comparator U1 is used for the first voltage value when the inverting input terminal of the first comparator U1 from benchmark
When value decreases below the preset second voltage value of the non-inverting input terminal of the first comparator U1, compare by first
The output end of device U1 exports the first level signal.
The inverting input terminal of the first comparator U1 passes through first resistor R1 and sample circuit 11 and the power module 4
Electrical connection, for obtaining the first voltage value.The first resistor R1 is used as divider resistance, prevents described in the excessive damage of voltage
First comparator U1.The sample circuit 11 is used to sample the electric signal of the power module 4, in this present embodiment, when described
When power module 4 stops working, the sample circuit 11 exports the benchmark threshold voltage of sample circuit 11 to the first comparator
The inverting input terminal of U1, the benchmark threshold voltage is as the first voltage value.When the power module 4 starts work, power mould
The electric current of block 4 is bigger, and the voltage of the inverting input terminal of the output of sample circuit 11 to the first comparator U1 is smaller, i.e. electric current
Bigger, the first voltage value is smaller.
First power supply passes sequentially through second resistance R2 and 3rd resistor R3 ground connection, the same phase of the first comparator U1
Input terminal is connected between the second resistance R2 and the 3rd resistor R3 to obtain second voltage value.
In this present embodiment, the second voltage value of the non-inverting input terminal of the first comparator U1 is described in the first power supply warp
Voltage value after second resistance R2 and 3rd resistor R3 partial pressure, the second voltage value is according to first power supply, second
The value of resistance R2 and the 3rd resistor R3 determine.In this present embodiment, first power supply is 3.3V.The second voltage value
Less than the benchmark threshold voltage.
First signal processing module 2 further includes first capacitor C1 and the second capacitor C2, the first comparator U1's
Inverting input terminal is grounded by the first capacitor C1, and the non-inverting input terminal of the first comparator U1 passes through second capacitor
C2 ground connection.
Generally, when overcurrent triggering overcurrent protection occurs for the power module 4, the first voltage value is less than second voltage
Value, the output end of the first comparator U1 export the first level signal, and in this present embodiment, when first level signal is high
Level signal.The output end of the first comparator U1 is electrically connected with the Hardware drive module 5, as the first comparator U1
Output end when exporting the first level signal, the Hardware drive module 5 stops driving the power module 4, then the power
Module 4 stops working, and the first voltage value is changed into a reference value.
It includes second source, the 4th resistance R4 and first diode D1 that the voltage, which changes unit, the second source, the
Four resistance R4, the output end of first comparator U1, first diode D1 and the first comparator U1 non-inverting input terminal successively
Electrical connection.Wherein, the anode of the first diode D1 is electrically connected in the output end of the first comparator U1, and the described 1st
The cathode of pole pipe D1 is electrically connected in the non-inverting input terminal of the first comparator U1.
The voltage changes unit and is used for institute when the output end of the first comparator U1 exports the first level signal
The voltage value for stating the non-inverting input terminal of first comparator U1 changes into third voltage value, wherein the second voltage value is less than institute
A reference value is stated, the third voltage value is greater than a reference value.
Generally, traditional current foldback circuit is after the overcurrent protection that is triggered, i.e. cutting Hardware drive module 5 is to power
To protect Hardware drive module 5, current foldback circuit can't detect high current immediately for the driving of module 4, stop output protection letter
Number, processor 6 can not detect overcurrent letter protection number in a short time, cause protection incomplete.
In this present embodiment, when the first comparator U1 exports the first level signal (i.e. high level), described second
Homophase input of the power supply through the 4th resistance R4, the output end of first comparator U1, first diode D1, first comparator U1
End, 3rd resistor R3 earth-continuity, so that the voltage value of the non-inverting input terminal of the first comparator U1 is changed into third electricity
Pressure value, in this present embodiment, the third voltage value is according to the second source, the 4th resistance R4,3rd resistor R3 and described
First diode D1 determines that in this present embodiment, the second source is 5V, and the third voltage value is greater than a reference value,
So that the level state of the inverting input terminal of the first comparator U1 is lower than the non-inverting input terminal of the first comparator U1, with
It keeps the output end of the first comparator U1 to export the first level signal, prevents from stopping driving when the Hardware drive module 5
The power module 4, the first voltage value are changed into a reference value and no longer meet the same phase that the first voltage value is less than first comparator U1
The second voltage value of input terminal causes processor 6 to can't detect fault-signal.
The second signal processing module 3 is electrically connected with the output end of the first comparator U1, at the second signal
Reason module 3 is electrically connected with the processor 6, and the second signal processing module 3 is used to generate simultaneously as the first comparator U1
Fault-signal is generated when exporting the first level signal, and the fault-signal is sent to the processor 6.
The second signal processing module 3 include the second comparator U2, third power supply, the 5th resistance R5, the 6th resistance R6,
Third capacitor C3 and the 4th capacitor C4, the third power supply passes sequentially through the 5th resistance R5 and the 6th resistance R6 connects
Ground, the non-inverting input terminal of the second comparator U2 are connected between the 5th resistance R5 and the 6th resistance R6 to obtain
5th voltage value.
The inverting input terminal of the second comparator U2 is electrically connected to obtain with the output end of the first comparator U1
Four voltage values, in this present embodiment, the 4th voltage value are the output signal of the first comparator U1, and described second compares
Device U2 is used for when the 4th voltage value of the inverting input terminal of the second comparator U2 is greater than preset five voltage value
Fault-signal is generated, and the fault-signal is sent to the processor 6.
In this present embodiment, there are 2 kinds of situations for the 4th voltage value, i.e. first comparator U1 is when triggering overcurrent protection
Output end output high level signal (the first level signal) and do not trigger the low level signal exported when overcurrent protection, institute
The 5th voltage value is stated greater than the low level signal, is less than the high level signal.
In this present embodiment, the 5th voltage value is third power supply through the 5th resistance R5 and the 6th resistance
R6 divides to be formed, and the third power supply is 3.3V, can adjust institute by adjusting the prevention of the 5th resistance R5 and the 6th resistance R6
State the 5th voltage value.
The inverting input terminal of the second comparator U2 is grounded by third capacitor C3, the same phase of the second comparator U2
Input terminal is grounded by the 4th capacitor C4.
The second signal processing module 3 further includes the 4th power supply, the 7th resistance R7, the 8th resistance R8 and the 5th capacitor
C5, the 4th power supply, the output end of the 7th the second comparator of resistance R7 U2 and the 5th capacitor C5 are sequentially connected in series ground connection.Institute
It states the 8th resistance R8 to be set between the output end and the processor 6 of the second comparator U2, to prevent the second comparator
The excessive break treat with device 6 of U2 output voltage.
In this present embodiment, the over current protecting self-locking circuit 1 further includes the second diode D2, the first comparator U1
Output end be electrically connected with the processor 6 by the second diode D2, wherein the anode of the second diode D2 and
The output end of first comparator U1 is electrically connected, and the cathode of the second diode D2 is electrically connected in the processor 6.The processing
Device 6 generates the instruction that unlocks for responding the fault-signal, and the instruction that unlocks is exported to first ratio
Compared with the output end of device U1, so that the output end of the first comparator U1 changes level state.
Preferably, the instruction that unlocks is a low level signal, when the processor 6 exports the finger that unlocks
When enabling, the second diode D2 conducting, the level state of the output end of the first comparator U1 is pulled low, first diode
D1 cut-off, the voltage value of the non-inverting input terminal of first comparator U1 revert to second voltage value；First comparator U1 is persistently exported
Second electrical level signal, the second electrical level signal are low level signal；The second comparator U2 stops output fault-signal extremely
The processor 6 is to release the locking of the overcurrent protection state.The over current protecting self-locking circuit 1 restores initial detection
State.
Second embodiment
The present embodiment provides a kind of air conditioners 8, referring to Fig. 3, the air conditioner 8 includes processor 6, Hardware drive module
5, the over current protecting self-locking circuit 1 provided in power module 4, motor 7 and first embodiment, the processor 6 and the hardware
Drive module 5 is electrically connected, and the Hardware drive module 5 is electrically connected with the power module 4, the power module 4 and the electricity
Machine 7 is electrically connected.The over current protecting self-locking circuit 1 includes the first signal processing module 2 and second signal processing module 3, described
First signal processing module 2 is electrically connected by sample circuit 11 with the power module 4, first signal processing module 2
Output end is electrically connected with the second signal processing module 3, the output end of first signal processing module 2 also with the hardware
Drive module 5 is electrically connected.The second signal processing module 3 is electrically connected with the processor 6.
It should be noted that the basic principle and technical effect of the present embodiment are essentially identical with first embodiment, it is brief
Description the present embodiment is no longer described in detail, and the present embodiment does not introduce detailed place, please refers to the correlation in first embodiment
Content.
It should be noted that the processor 6 can be general processor 6, including central processing unit (Central
Processing Unit, CPU), network processing unit (Network Processor, NP) etc.；It can also be Digital Signal Processing
Device (Digital Signal Processing, DSP), specific integrated circuit (Application Specific
Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA)
Either other programmable logic device, discrete gate or transistor logic, discrete hardware components.General processor can be
Microprocessor；The processor 6 can also be any conventional processor 6 etc..
In conclusion being changed by setting voltage single the present invention provides a kind of over current protecting self-locking circuit and air conditioner
Member makes first comparator still keep non-inverting input terminal and anti-phase input after being triggered the first level signal of generation by high current
The high low state of the level at end can be such that processor detected in time to keep the level state of first comparator output end
The protection signal of pressure or overcurrent, to implement to protect.Avoid that traditional current foldback circuit is easy to appear to power module
Loss repeatedly, can be effectively protected motor, extend the service life of motor and air conditioner.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of over current protecting self-locking circuit, which is characterized in that the over current protecting self-locking circuit (1) and a power module (4)
Electrical connection, the over current protecting self-locking circuit (1) are also electrically connected with a Hardware drive module (5), the Hardware drive module (5)
It is electrically connected with the power module (4) to drive the power module (4)；The over current protecting self-locking circuit (1) includes: first
Signal processing module (2)；First signal processing module (2) includes that first comparator (U1) and voltage change unit, institute
State the non-inverting input terminal of first comparator (U1), the voltage changes unit and the output end of the first comparator (U1) according to
Secondary electrical connection；
The first comparator (U1) is used for the first voltage value when the inverting input terminal of the first comparator (U1) from benchmark
When value decreases below the preset second voltage value of the non-inverting input terminal of the first comparator (U1), pass through the first ratio
Output end compared with device (U1) exports the first level signal；
The voltage change unit is used for will be described when the output end of the first comparator (U1) exports the first level signal
The voltage value of the non-inverting input terminal of first comparator (U1) changes into third voltage value, wherein the second voltage value is less than institute
A reference value is stated, the third voltage value is greater than a reference value.
2. over current protecting self-locking circuit according to claim 1, which is characterized in that first signal processing module (2)
Further include the first power supply, second resistance (R2) and 3rd resistor (R3), first power supply pass sequentially through second resistance (R2) and
3rd resistor (R3) ground connection, the non-inverting input terminal of the first comparator (U1) are connected to the second resistance (R2) and described the
To obtain second voltage value between three resistance (R3).
3. over current protecting self-locking circuit according to claim 1, which is characterized in that the reverse phase of the first comparator (U1)
Input terminal is electrically connected by first resistor (R1) and sample circuit (11) with the power module (4), for obtaining described first
Voltage value.
4. over current protecting self-locking circuit according to claim 1, which is characterized in that it includes second that the voltage, which changes unit,
Power supply, the 4th resistance (R4) and first diode (D1), the second source, the 4th resistance (R4), first comparator (U1)
The non-inverting input terminal of output end, first diode (D1) and the first comparator (U1) is sequentially connected electrically.
5. over current protecting self-locking circuit (1) according to claim 1, which is characterized in that the first comparator (U1)
Output end is electrically connected with the Hardware drive module (5), when the output end of the first comparator (U1) exports the first level letter
Number when, the Hardware drive module (5) stops driving the power module (4) so that on the basis of the first voltage value transformation
Value.
6. over current protecting self-locking circuit according to claim 1, which is characterized in that the over current protecting self-locking circuit (1)
It further include second signal processing module (3), first signal processing module (2) and the second signal processing module (3) electricity
Connection, the second signal processing module (3) are electrically connected with a processor (6), and the second signal processing module (3) is for working as
First signal processing module (2) generates fault-signal when generating the first level signal, and the fault-signal is sent to
The processor (6).
7. over current protecting self-locking circuit according to claim 6, which is characterized in that the second signal processing module (3)
Including the second comparator (U2), the inverting input terminal of second comparator (U2) and the output end of the first comparator (U1)
Electrical connection, second comparator (U2) are used to be greater than when the 4th voltage value of the inverting input terminal of second comparator (U2)
Fault-signal is generated when preset five voltage value, and the fault-signal is sent to the processor (6).
8. over current protecting self-locking circuit according to claim 7, which is characterized in that the over current protecting self-locking circuit (1)
Including the second diode (D2), the output end of the first comparator (U1) passes through second diode (D2) and the processing
Device (6) electrical connection, the processor (6) generates the instruction that unlocks for responding the fault-signal, and the releasing is locked
Fixed instruction is exported to the output end of the first comparator (U1), so that the output end of the first comparator (U1) changes level
State.
9. over current protecting self-locking circuit according to claim 7, which is characterized in that the second signal processing module (3)
It further include third power supply, the 5th resistance (R5) and the 6th resistance (R6), the third power supply passes sequentially through the 5th resistance
(R5) and the 6th resistance (R6) ground connection, the non-inverting input terminal of second comparator (U2) are connected to the 5th resistance
(R5) to obtain the 5th voltage value between the 6th resistance (R6).
10. a kind of air conditioner, which is characterized in that the air conditioner (8) includes mistake as claimed in any one of claims 1 to 9 wherein
Stream protection latching circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810975953.8A CN108923386B (en) | 2018-08-24 | 2018-08-24 | A kind of over current protecting self-locking circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810975953.8A CN108923386B (en) | 2018-08-24 | 2018-08-24 | A kind of over current protecting self-locking circuit and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108923386A CN108923386A (en) | 2018-11-30 |
| CN108923386B true CN108923386B (en) | 2019-10-11 |
Family
ID=64406600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810975953.8A Active CN108923386B (en) | 2018-08-24 | 2018-08-24 | A kind of over current protecting self-locking circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108923386B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525518A (en) * | 2020-05-09 | 2020-08-11 | 青岛海信日立空调系统有限公司 | Air conditioner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904416Y (en) * | 2006-01-24 | 2007-05-23 | 许晓华 | Overcurrent locking circuit |
| CN103904622A (en) * | 2014-04-09 | 2014-07-02 | 东南大学 | IGBT overcurrent protection circuit |
| CN103944141A (en) * | 2014-04-02 | 2014-07-23 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
| CN105790226A (en) * | 2016-03-11 | 2016-07-20 | 苏州爱科博瑞电源技术有限责任公司 | Overcurrent protection circuit and method of power tube and inversion circuit based on overcurrent protection circuit |
| CN205565674U (en) * | 2016-04-28 | 2016-09-07 | 广东美的制冷设备有限公司 | Current foldback circuit , drive circuit and electric installation |
| CN206506284U (en) * | 2017-02-20 | 2017-09-19 | 广东美的制冷设备有限公司 | A kind of compressor protective circuit and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI397246B (en) * | 2009-11-06 | 2013-05-21 | Analog Vision Technology Inc | Protection circuit with latch control |
-
2018
- 2018-08-24 CN CN201810975953.8A patent/CN108923386B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2904416Y (en) * | 2006-01-24 | 2007-05-23 | 许晓华 | Overcurrent locking circuit |
| CN103944141A (en) * | 2014-04-02 | 2014-07-23 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
| CN103904622A (en) * | 2014-04-09 | 2014-07-02 | 东南大学 | IGBT overcurrent protection circuit |
| CN105790226A (en) * | 2016-03-11 | 2016-07-20 | 苏州爱科博瑞电源技术有限责任公司 | Overcurrent protection circuit and method of power tube and inversion circuit based on overcurrent protection circuit |
| CN205565674U (en) * | 2016-04-28 | 2016-09-07 | 广东美的制冷设备有限公司 | Current foldback circuit , drive circuit and electric installation |
| CN206506284U (en) * | 2017-02-20 | 2017-09-19 | 广东美的制冷设备有限公司 | A kind of compressor protective circuit and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108923386A (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105305797A (en) | Overvoltage and undervoltage protection circuit for output of DC/DC power supply | |
| CN107845998B (en) | Input power supply health detection and management circuit in power supply parallel redundancy system | |
| CN104659732B (en) | Over-voltage over-current protection circuit | |
| CN110176750A (en) | Overvoltage crowbar | |
| CN108923386B (en) | A kind of over current protecting self-locking circuit and air conditioner | |
| CN203645292U (en) | An overvoltage over-current protection circuit | |
| CN103427810A (en) | Signal generator circuit | |
| CN208522445U (en) | A kind of current foldback circuit and controller | |
| CN110416973A (en) | Motor overvoltage protection circuit, undervoltage protection circuit, voltage protection circuit and motor | |
| CN110212507A (en) | Surge protection circuit | |
| CN210137176U (en) | Overvoltage protection circuit | |
| CN218976343U (en) | Surge overcurrent and overvoltage regulator protection circuit and remote controller for vehicles | |
| CN208257383U (en) | A kind of self-locking over-voltage over-current protection circuit | |
| CN1674381A (en) | Under-voltage isolating monitoring circuit | |
| CN204758768U (en) | IGBT overflows failure detector circuit | |
| CN109066598A (en) | A kind of low level triggering latching circuit | |
| CN213637672U (en) | Integrated drive protection chip and system for power device | |
| CN208753973U (en) | A kind of low level triggering latching circuit | |
| CN109361195A (en) | A kind of protection circuit against input over-voltage and power-supply system | |
| CN209282814U (en) | Silicon-controlled protection and soft starting circuit | |
| CN114884042A (en) | Low-voltage direct-current input power supply protection circuit based on surge suppression IC | |
| CN209250235U (en) | Surge protection circuit, circuit system and electronic equipment | |
| CN207098589U (en) | A kind of LED power protection circuit against input over-voltage and LED power | |
| CN113078616A (en) | Rear-stage direct-current power supply circuit | |
| CN205139761U (en) | Three -terminal steady voltage source that possesses overvoltage protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200407 Address after: 519080 202, floor 2, building B, headquarters base, No.2 Qianwan Second Road, Tangjiawan Town, Zhuhai City, Guangdong Province Patentee after: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Address before: 315000, Ningbo, Zhejiang province Yinzhou District Jiang Zhen Town, Xia Shi Village Patentee before: AUX AIR CONDITIONING Co.,Ltd. |
|
| TR01 | Transfer of patent right |