CN106961095B - Current foldback circuit and air conditioner - Google Patents
Current foldback circuit and air conditioner Download PDFInfo
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- CN106961095B CN106961095B CN201710345634.4A CN201710345634A CN106961095B CN 106961095 B CN106961095 B CN 106961095B CN 201710345634 A CN201710345634 A CN 201710345634A CN 106961095 B CN106961095 B CN 106961095B
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- 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
- H02H7/20—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 electronic equipment
- H02H7/205—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 electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses a kind of current foldback circuit and air conditioner, which includes intelligent power module, compressor, current sampling resistor, MCU and current foldback circuit unit；Current sampling resistor is used to sample the electric current of the lower bridge arm output end of the intelligent power module；MCU, according to the demagnetization protective current value of setting, exports corresponding pwm control signal to the current foldback circuit unit for setting to the demagnetization protective current value of the compressor；The pwm control signal of electric current and MCU output that current foldback circuit unit is used to be sampled according to the current sampling resistor; corresponding overcurrent protection signal is exported to the intelligent power module, to carry out overcurrent protection to the intelligent power module and carry out demagnetization protection to the compressor.The present invention can be effectively protected intelligent power module and compressor, meanwhile, the present invention also has the advantages that versatility is stronger.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of current foldback circuits and air conditioner.
Background technique
IPM (Intelligent Power Module, IPM, intelligent power module) is a kind of by power electronics and integrated
The power drive class product that circuit engineering combines.Device for power switching and high-voltage driving circuit are integrated in one by intelligent power module
It rises, compared with traditional discrete scheme, intelligent power module wins increasing city with advantages such as its high integration, high reliability
, it is particularly suitable for the frequency converter and various inverters of driving motor, is frequency control, metallurgical machinery, electric propulsion, servo
A kind of desired power level electronic device of driving and frequency-conversion domestic electric appliances (such as air conditioner).However, intelligent power module is in practical applications,
When the MCU for controlling the intelligent power module work breaks down, the IGBT of a certain bridge arm inside intelligent power module is opened
Prolonged on state will be in by closing pipe, so that there is a phenomenon where overcurrents for intelligent power module.
Referring to Fig.1, Fig. 1 is that the circuit structure of one embodiment of current foldback circuit of intelligent power module in the prior art shows
It is intended to, which includes MCU101, intelligent power module 102, compressor 103 and current sampling resistor RS1.Specifically
Ground, bridge arm control signal output U+ is controlled with bridge arm in the U phase of the intelligent power module 102 in the U phase of the MCU101
Signal input part U1+ connection, bridge arm control signal output V+ and the intelligent power module 102 in the V phase of the MCU101
V phase on the V1+ connection of bridge arm control signal input, in the W phase of the MCU101 bridge arm control signal output W+ with it is described
Bridge arm control signal input W1+ connection in the W phase of intelligent power module 102；The U phase lower bridge arm of the MCU101 controls signal
Output end U- is connect with the U phase lower bridge arm control signal input U1- of the intelligent power module 102, the V phase of the MCU101
Lower bridge arm control signal output V- is connect with the V phase lower bridge arm control signal input V1- of the intelligent power module 102,
The W phase lower bridge arm control signal output W- of the MCU101 and the W phase lower bridge arm of the intelligent power module 102 control signal
Input terminal W1- connection；The U phase output terminal U of the intelligent power module 102 is connect with the U phase input terminal of the compressor 103,
The V phase output terminal V of the intelligent power module 102 is connect with the V phase input terminal of the compressor 103, the intelligent power mould
The W phase output terminal W of block 102 is connect with the W phase input terminal of the compressor 103；The lower bridge arm of the intelligent power module 102 is defeated
Outlet and overcurrent protection pin are connect with the first end of the current sampling resistor RS1, and the of the current sampling resistor RS1
Two ends ground connection.
The current foldback circuit of intelligent power module shown in FIG. 1 works when the control intelligent power module 102
When MCU101 breaks down, the IGBT switching tube of a certain bridge arm inside the intelligent power module 102 will be in for a long time
On state so that there is a phenomenon where overcurrents for the intelligent power module 102, when the intelligent power module
When 102 generation overcurrent, the overcurrent protection function of the intelligent power module 102 can detect over-current signal and automatically shut down
Its internal IGBT switching tube realizes the purpose for protecting the intelligent power module 102.However, due to different compressors
Demagnetization protective current value be it is different, therefore, when using different automatically controlled hardware cooperate different compressors when, shown in Fig. 1
Current foldback circuit cannot protect compressor well, or pass through corresponding resistor (such as current sample electricity adjusted in circuit
Resistance) resistance value to reach the protection requirement to compressor, i.e., the current foldback circuit of intelligent power module shown in FIG. 1 it is general
Property is not strong.
Summary of the invention
The main purpose of the present invention is to provide a kind of current foldback circuits, it is intended to enhance the versatility of circuit.
To achieve the goals above, the present invention provides a kind of current foldback circuit, and the current foldback circuit includes intelligence
Power module, compressor, current sampling resistor, MCU and current foldback circuit unit；Wherein:
The current sampling resistor, the electric current for the lower bridge arm output end to the intelligent power module sample；
The MCU is set for the demagnetization protective current value to the compressor, and according to the demagnetization of setting
Protective current value exports corresponding pwm control signal to the current foldback circuit unit；
The current foldback circuit unit, electric current and the MCU for being sampled according to the current sampling resistor
The pwm control signal of output exports corresponding overcurrent protection signal to the intelligent power module, to the intelligent function
Rate module carries out overcurrent protection and carries out demagnetization protection to the compressor.
Preferably, the first end of the current sampling resistor is connect with the lower bridge arm output end of the intelligent power module,
The second end of the current sampling resistor is grounded；The sample rate current input terminal of the current foldback circuit unit is adopted with the electric current
The first end of sample resistance connects, and the protective current value adjustable side of the current foldback circuit unit and the PWM of the MCU are controlled and believed
The protective current value of the connection of number output end, the current foldback circuit unit adjusts voltage sampling port and the voltage of the MCU is adopted
The connection of sample end, the overcurrent protection signal output end of the current foldback circuit unit and the overcurrent protection of the intelligent power module
Pin connection.
Preferably, the current foldback circuit unit includes operating voltage input terminal, first resistor, second resistance, third
Resistance, the 4th resistance, first capacitor, voltage comparator and PNP triode；Wherein:
The first end of the first resistor be the current foldback circuit unit protective current value adjustable side, described first
The first end of resistance is connect with the pwm control signal output end of the MCU, and the second end of the first resistor is overcurrent guarantor
The protective current value of protection circuit unit adjusts voltage sampling port, the second end of the first resistor respectively with the voltage comparator
Non-inverting input terminal and the MCU voltage sampling port connection；The of the first end of the second resistance and the first resistor
The connection of two ends, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input terminal, the first end of the 3rd resistor and the electric current
The first end of sampling resistor connects, and the second end of the 3rd resistor is connect with the inverting input terminal of the voltage comparator；Institute
The output end for stating voltage comparator is connect through the 4th resistance with the base stage of the PNP triode；The hair of the PNP triode
Emitter-base bandgap grading is connect with operating voltage input terminal, and the overcurrent of the extremely described current foldback circuit unit of the current collection of the PNP triode is protected
Signal output end is protected, the collector of the PNP triode is connect with the overcurrent protection pin of the intelligent power module.
Preferably, the current foldback circuit unit includes operating voltage input terminal, first resistor, second resistance, third
Resistance, the 4th resistance, first capacitor, voltage comparator and NPN triode；Wherein:
The first end of the first resistor be the current foldback circuit unit protective current value adjustable side, described first
The first end of resistance is connect with the pwm control signal output end of the MCU, and the second end of the first resistor is overcurrent guarantor
The protective current value of protection circuit unit adjusts voltage sampling port, the second end of the first resistor respectively with the voltage comparator
Inverting input terminal and the MCU voltage sampling port connection；The of the first end of the second resistance and the first resistor
The connection of two ends, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input terminal, the first end of the 3rd resistor and the electric current
The first end of sampling resistor connects, and the second end of the 3rd resistor is connect with the non-inverting input terminal of the voltage comparator；Institute
The output end for stating voltage comparator is connect with the base stage of the NPN triode；The collector and operating voltage of the NPN triode
Input terminal connection, the collector of the NPN triode are also connect through the 4th resistance with the base stage of the NPN triode, institute
The overcurrent protection signal output end of the extremely described current foldback circuit unit of transmitting of NPN triode is stated, the NPN triode
Emitter is connect with the overcurrent protection pin of the intelligent power module.
Preferably, the current foldback circuit unit includes operating voltage input terminal, first resistor, second resistance, third
Resistance, the 4th resistance, first capacitor, voltage comparator and PMOS tube；Wherein:
The first end of the first resistor be the current foldback circuit unit protective current value adjustable side, described first
The first end of resistance is connect with the pwm control signal output end of the MCU, and the second end of the first resistor is overcurrent guarantor
The protective current value of protection circuit unit adjusts voltage sampling port, the second end of the first resistor respectively with the voltage comparator
Non-inverting input terminal and the MCU voltage sampling port connection；The of the first end of the second resistance and the first resistor
The connection of two ends, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input terminal, the first end of the 3rd resistor and the electric current
The first end of sampling resistor connects, and the second end of the 3rd resistor is connect with the inverting input terminal of the voltage comparator；Institute
The output end for stating voltage comparator is connect with the grid of the PMOS tube；The drain electrode of the PMOS tube and operating voltage input terminal connect
It connects, the drain electrode of the PMOS tube is also connect through the 4th resistance with the grid of the PMOS tube, and the source electrode of the PMOS tube is
The overcurrent protection signal output end of the current foldback circuit unit, the source electrode of the PMOS tube and the intelligent power module
The connection of overcurrent protection pin.
Preferably, the current foldback circuit unit includes operating voltage input terminal, first resistor, second resistance, third
Resistance, the 4th resistance, first capacitor, voltage comparator and NMOS tube；Wherein:
The first end of the first resistor be the current foldback circuit unit protective current value adjustable side, described first
The first end of resistance is connect with the pwm control signal output end of the MCU, and the second end of the first resistor is overcurrent guarantor
The protective current value of protection circuit unit adjusts voltage sampling port, the second end of the first resistor respectively with the voltage comparator
Inverting input terminal and the MCU voltage sampling port connection；The of the first end of the second resistance and the first resistor
The connection of two ends, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input terminal, the first end of the 3rd resistor and the electric current
The first end of sampling resistor connects, and the second end of the 3rd resistor is connect with the non-inverting input terminal of the voltage comparator；Institute
The output end for stating voltage comparator is connect with the grid of the NMOS tube；The drain electrode of the NMOS tube and operating voltage input terminal connect
It connects, the drain electrode of the NMOS tube is also connect through the 4th resistance with the grid of the NMOS tube, and the source electrode of the NMOS tube is
The overcurrent protection signal output end of the current foldback circuit unit, the source electrode of the NMOS tube and the intelligent power module
The connection of overcurrent protection pin.
Preferably, bridge arm control signal output and bridge arm in the U phase of the intelligent power module in the U phase of the MCU
Control signal input connection, in the V phase of the MCU bridge arm control signal output in the V phase of the intelligent power module
Bridge arm control signal input connects, the W of bridge arm control signal output and the intelligent power module in the W phase of the MCU
Bridge arm control signal input connects in phase；The U phase lower bridge arm control signal output and the intelligent power module of the MCU
The connection of U phase lower bridge arm control signal input, the V phase lower bridge arm control signal output of the MCU and the intelligent power
The V phase lower bridge arm control signal input of module connects, the W phase lower bridge arm control signal output and the intelligence of the MCU
The W phase lower bridge arm control signal input of power module connects.
Preferably, the U phase input terminal of the U phase output terminal with the compressor of the intelligent power module is connect, the intelligence
The V phase output terminal of energy power module is connect with the V phase input terminal of the compressor, the W phase output terminal of the intelligent power module
It is connect with the W phase input terminal of the compressor.
In addition, to achieve the above object, the present invention also provides a kind of air conditioner, the air conditioner includes mistake as described above
Stream protection circuit.
The present invention provides a kind of current foldback circuit, which includes intelligent power module, compressor, electric current
Sampling resistor, MCU and current foldback circuit unit；The current sampling resistor, for the lower bridge to the intelligent power module
The electric current of arm output end is sampled；The MCU is set for the demagnetization protective current value to the compressor, and root
According to the demagnetization protective current value of setting, corresponding pwm control signal is exported to the current foldback circuit unit；The mistake
Stream protection circuit unit, the PWM control of electric current and MCU output for being sampled according to the current sampling resistor
Signal processed exports corresponding overcurrent protection signal to the intelligent power module, to carry out overcurrent to the intelligent power module
It protects and demagnetization protection is carried out to the compressor.Current foldback circuit of the present invention, the MCU can move back the compressor
Magnetic protective current value is set, and according to the demagnetization protective current value of setting, exports corresponding pwm control signal, and
The current foldback circuit unit can be according to electric current and MCU output that the current sampling resistor is sampled
Pwm control signal exports corresponding overcurrent protection signal to the intelligent power module, protects the intelligent power mould to realize
The purpose of block and the compressor；Also, current foldback circuit of the present invention, since the MCU can move back the compressor
Magnetic protective current value is set, and therefore, current foldback circuit of the present invention has the advantages that versatility is stronger；Meanwhile the present invention
Current foldback circuit also has the advantages that circuit structure simple, high reliablity and at low cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of one embodiment of current foldback circuit of intelligent power module in the prior art；
Fig. 2 is the modular structure schematic diagram of current foldback circuit first embodiment of the present invention；
Fig. 3 is the electrical block diagram of current foldback circuit second embodiment of the present invention；
Fig. 4 is the electrical block diagram of current foldback circuit 3rd embodiment of the present invention；
Fig. 5 is the electrical block diagram of current foldback circuit fourth embodiment of the present invention；
Fig. 6 is the electrical block diagram of the 5th embodiment of current foldback circuit of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of current foldback circuit, is current foldback circuit first embodiment of the present invention referring to Fig. 2, Fig. 2
Modular structure schematic diagram, in the present embodiment, which includes MCU201, intelligent power module 202, compressor
203, current foldback circuit unit 204 and current sampling resistor RS.
In the present embodiment, the current sampling resistor RS, for the lower bridge arm output end to the intelligent power module 202
Electric current sampled；
The MCU201 is set for the demagnetization protective current value to the compressor 203, and according to the institute of setting
Demagnetization protective current value is stated, exports corresponding pwm control signal to the current foldback circuit unit 204；
The current foldback circuit unit 204, electric current and institute for being sampled according to the current sampling resistor RS
The pwm control signal for stating MCU201 output, exports corresponding overcurrent protection signal to the intelligent power module 202, with
Overcurrent protection is carried out to the intelligent power module 202 and demagnetization protection is carried out to the compressor 203.
Specifically, in the present embodiment, under the first end of the current sampling resistor RS and the intelligent power module 202
The connection of bridge arm output end, the second end ground connection of the current sampling resistor RS；The sampling electricity of the current foldback circuit unit 204
Stream input terminal A is connect with the first end of the current sampling resistor RS, the protective current value of the current foldback circuit unit 204
Adjustable side B is connect with the pwm control signal output end PWM1 of the MCU201, the protection of the current foldback circuit unit 204
Current value adjustment voltage sampling port C is connect with the voltage sampling port ADC of the MCU201, the current foldback circuit unit 204
Overcurrent protection signal output end D connect with the overcurrent protection pin of the intelligent power module 202.
In the present embodiment, bridge arm control signal output U+ and the intelligent power module 202 in the U phase of the MCU201
U phase on the U1+ connection of bridge arm control signal input, in the V phase of the MCU201 bridge arm control signal output V+ with it is described
Bridge arm control signal input V1+ connection in the V phase of intelligent power module 202, bridge arm controls signal in the W phase of the MCU201
Output end W+ is connect with bridge arm control signal input W1+ in the W phase of the intelligent power module 202；The U phase of the MCU201
Lower bridge arm control signal output U- is connect with the U phase lower bridge arm control signal input U1- of the intelligent power module 202,
The V phase lower bridge arm control signal output V- of the MCU201 and the V phase lower bridge arm of the intelligent power module 202 control signal
Input terminal V1- connection, the W phase lower bridge arm control signal output W- and the W phase of the intelligent power module 202 of the MCU201
The W1- connection of lower bridge arm control signal input；The U of the U phase output terminal U of the intelligent power module 202 and the compressor 203
The connection of phase input terminal, the V phase output terminal V of the intelligent power module 202 are connect with the V phase input terminal of the compressor 203, institute
The W phase output terminal W for stating intelligent power module 202 is connect with the W phase input terminal of the compressor 203；The intelligent power module
202 lower bridge arm output end and overcurrent protection pin is connect with the first end of the current sampling resistor RS, and the electric current is adopted
The second end of sample resistance RS is grounded.
Fig. 3 is the electrical block diagram of current foldback circuit second embodiment of the present invention, together referring to Fig. 2 and Fig. 3, originally
In embodiment, the current foldback circuit unit 204 include operating voltage input terminal VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, first capacitor C1, voltage comparator ic 1 and PNP triode Q1.In the present embodiment, the work
The voltage for making voltage input end VCC is equal to the operating voltage of the MCU201.
Specifically, in the present embodiment, the first end of the first resistor R1 is the guarantor of the current foldback circuit unit 204
Current value adjustment end B is protected, the first end of the first resistor R1 and the pwm control signal output end PWM1 of the MCU201 connect
It connects, the second end of the first resistor R1 is that the protective current value of the current foldback circuit unit 204 adjusts voltage sampling port
C, the second end of the first resistor R1 voltage with the non-inverting input terminal of the voltage comparator ic 1 and the MCU201 respectively
Sampling end ADC connection；The first end of the second resistance R2 is connect with the second end of the first resistor R1, the second resistance
The second end of R2 is grounded；The first capacitor C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is institute
State the sample rate current input terminal A of current foldback circuit unit 204, the first end of the 3rd resistor R3 and current sample electricity
The first end connection of RS is hindered, the second end of the 3rd resistor R3 is connect with the inverting input terminal of the voltage comparator ic 1；Institute
The output end for stating voltage comparator ic 1 is connect through the 4th resistance R4 with the base stage of the PNP triode Q1；The PNP tri-
The emitter of pole pipe Q1 is connect with operating voltage input terminal VCC, the extremely described overcurrent protection electricity of the current collection of the PNP triode Q1
The overcurrent protection signal output end D of road unit 204, the collector of the PNP triode Q1 and the intelligent power module 202
The connection of overcurrent protection pin.
In the initial state, the pwm control signal output end PWM1 of the MCU201 is defeated for the present embodiment current foldback circuit
The pwm control signal that frequency is f duty ratio D out is to the current foldback circuit unit 204, so that the current foldback circuit list
The voltage of the second end of first resistor R1 described in member 204 (namely is input to the non-inverting input terminal of the voltage comparator ic 1
Voltage) Vref=VCC*R2/ (R1+R2) * D, wherein duty of the D by the MCU201 pwm control signal exported
Than VCC is the operating voltage of the MCU201, and R1 represents the resistance value of the first resistor R1, and R2 represents the second resistance R2
Resistance value.The present embodiment by adjust the duty ratio D of the pwm control signal of MCU201 output can be realized adjust it is defeated
Enter the purpose of the voltage Vref of the non-inverting input terminal to the voltage comparator ic 1.The present embodiment adjusting is input to the voltage
The process of the voltage Vref of the non-inverting input terminal of comparator IC1 are as follows: the voltage sampling port ADC sampled voltage of the MCU201 compares
The voltage value of the voltage Vref of the non-inverting input terminal of device IC1, when the voltage Vref that the MCU201 is sampled voltage value not
When equal to preset voltage value Vref0, the MCU201 adjusts the duty ratio D for the pwm control signal that it is exported, so that being input to
The voltage Vref of the non-inverting input terminal of the voltage comparator ic 1 is equal to preset voltage value Vref0.I.e. described in the present embodiment
MCU201 can be realized in real time accurately by the real-time accurate control of the duty ratio D of the pwm control signal exported to it
Control the purpose of the voltage Vref, and by this present embodiment, the compressor 203 demagnetizes protective current value Ip=Vref/
Adjusting can be realized by adjusting the duty ratio D for the pwm control signal that the MCU201 is exported in RS, therefore, the present embodiment
The purpose of the demagnetization of the compressor 203 protective current value Ip.
When the present embodiment current foldback circuit works normally, the electricity of the lower bridge arm output end of the intelligent power module 202
I < Ip (Ip is the compressor 203 demagnetization protective current value) is flowed, and works as the lower bridge arm output end of the intelligent power module 202
Electric current I < Ip when, when voltage Vin < Vref of the inverting input terminal of the voltage comparator ic 1, the voltage comparator ic 1
Output end be high-impedance state so that the PNP triode Q1 ends, so that the current foldback circuit unit 204
Overcurrent protection signal output end D exports low level, and the intelligent power module 202 works normally；
As electric current I >=Ip of the lower bridge arm output end of the intelligent power module 202, the voltage comparator ic 1
The output end of voltage Vin >=Vref of inverting input terminal, the voltage comparator ic 1 are low level low resistive state, so that described
PNP triode Q1 conducting, so that the high electricity of overcurrent protection signal output end D output of the current foldback circuit unit 204
Flat, i.e., the overcurrent protection pin of the described intelligent power module 202 can detect high level, when the mistake of the intelligent power module 202
When stream protection pin detects high level, the overcurrent protection function of the intelligent power module 202, the intelligent power mould are triggered
Block 202 stops working, and realizes the purpose for protecting the intelligent power module 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can demagnetize to the compressor 203
Shield current value Ip is adjusted and sets, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the intelligent power module 202 cooperate different compressors 203 to work, the current foldback circuit unit
204 can also protect the compressor 203 well.
The present embodiment current foldback circuit, the MCU201 can the demagnetization protective current value to the compressor set
It is fixed, and according to the demagnetization protective current value of setting, export corresponding pwm control signal, and the current foldback circuit list
Member 204 can (lower bridge arm of the i.e. described intelligent power module 202 be defeated according to the electric current that the current sampling resistor RS is sampled
The electric current that outlet is exported) and the pwm control signal that is exported of the MCU201, export corresponding overcurrent protection signal extremely
The intelligent power module 202, to realize the purpose for protecting the intelligent power module 202 and the compressor 203；Also,
The present embodiment current foldback circuit, due to the MCU201 can the demagnetization protective current value to the compressor 203 set
Fixed, therefore, current foldback circuit of the present invention has the advantages that versatility is stronger；Meanwhile the present embodiment current foldback circuit also has
There are circuit structure simple, high reliablity and at low cost.
Fig. 4 is the electrical block diagram of current foldback circuit 3rd embodiment of the present invention, together referring to Fig. 2 and Fig. 4, originally
In embodiment, the current foldback circuit unit 204 include operating voltage input terminal VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, first capacitor C1, voltage comparator ic 1 and NPN triode Q2.
Specifically, the first end of the first resistor R1 is the protective current value tune of the current foldback circuit unit 201
End B is saved, the first end of the first resistor R1 is connect with the pwm control signal output end PWM1 of the MCU201, and described first
The second end of resistance R1 is that the protective current value of the current foldback circuit unit 201 adjusts voltage sampling port C, first electricity
The second end for hindering R1 connects with the voltage sampling port ADC of the inverting input terminal of the voltage comparator ic 1 and the MCU201 respectively
It connects；The first end of the second resistance R2 is connect with the second end of the first resistor R1, the second end of the second resistance R2
Ground connection；The first capacitor C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is the overcurrent protection
The first of the sample rate current input terminal A of circuit unit 204, the first end of the 3rd resistor R3 and the current sampling resistor RS
End connection, the second end of the 3rd resistor R3 are connect with the non-inverting input terminal of the voltage comparator ic 1；The voltage compares
The output end of device IC1 is connect with the base stage of the NPN triode Q2；The collector and operating voltage of the NPN triode Q2 is defeated
Enter VCC is held to connect, base stage of the collector of the NPN triode Q2 also through the 4th resistance R4 and the NPN triode Q2
Connection, the overcurrent protection signal output end D of the extremely described current foldback circuit unit 204 of transmitting of the NPN triode Q2, institute
The emitter for stating NPN triode Q2 is connect with the overcurrent protection pin of the intelligent power module 202.
When the present embodiment current foldback circuit works normally, the electricity of the lower bridge arm output end of the intelligent power module 202
I < Ip (Ip is the compressor 203 demagnetization protective current value) is flowed, and works as the lower bridge arm output end of the intelligent power module 202
Electric current I < Ip when, when voltage Vin < Vref of the non-inverting input terminal of the voltage comparator ic 1, the voltage comparator ic 1
Output end be low level so that the NPN triode Q1 end so that the mistake of the current foldback circuit unit 204
Stream protection signal output end D exports low level, and the intelligent power module 202 works normally；
As electric current I >=Ip of the lower bridge arm output end of the intelligent power module 202, the voltage comparator ic 1
The output end of voltage Vin >=Vref of non-inverting input terminal, the voltage comparator ic 1 are high level, so that the PNP triode
Q1 conducting, so that the overcurrent protection signal output end D of the current foldback circuit unit 204 exports high level, i.e., it is described
The overcurrent protection pin of intelligent power module 202 can detect high level, when the overcurrent protection pin of the intelligent power module 202
When detecting high level, the overcurrent protection function of the intelligent power module 202 is triggered, the intelligent power module 202 stops
Work, realizes the purpose for protecting the intelligent power module 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can demagnetize to the compressor 203
Shield current value Ip is adjusted and sets, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the intelligent power module 202 cooperate different compressors 203 to work, the current foldback circuit unit
204 can also protect the compressor 203 well.
Fig. 5 is the electrical block diagram of current foldback circuit fourth embodiment of the present invention, together referring to Fig. 2 and Fig. 5, originally
In embodiment, the current foldback circuit unit 204 include operating voltage input terminal VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, first capacitor C1, voltage comparator ic 1 and PMOS tube Q3.
Specifically, the first end of the first resistor R1 is the protective current value tune of the current foldback circuit unit 204
End B is saved, the first end of the first resistor R1 is connect with the pwm control signal output end PWM1 of the MCU201, and described first
The second end of resistance R1 is that the protective current value of the current foldback circuit unit 204 adjusts voltage sampling port C, first electricity
The second end for hindering R1 connects with the voltage sampling port ADC of the non-inverting input terminal of the voltage comparator ic 1 and the MCU201 respectively
It connects；The first end of the second resistance R2 is connect with the second end of the first resistor R1, the second end of the second resistance R2
Ground connection；The first capacitor C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is the overcurrent protection
The first of the sample rate current input terminal A of circuit unit 204, the first end of the 3rd resistor R3 and the current sampling resistor RS
End connection, the second end of the 3rd resistor R3 are connect with the inverting input terminal of the voltage comparator ic 1；The voltage compares
The output end of device IC1 is connect with the grid of the PMOS tube Q3；The drain electrode of the PMOS tube Q3 and operating voltage input terminal VCC connect
It connects, the drain electrode of the PMOS tube Q3 is also connect through the 4th resistance R4 with the grid of the PMOS tube Q3, the PMOS tube Q3
Source electrode be the current foldback circuit unit 204 overcurrent protection signal output end D, the source electrode of the PMOS tube Q3 with it is described
The overcurrent protection pin of intelligent power module 202 connects.It should be noted that the PMOS tube Q3 in the present embodiment can be used
IGBT pipe substitution.
When the present embodiment current foldback circuit works normally, the electricity of the lower bridge arm output end of the intelligent power module 202
I < Ip (Ip is the compressor 203 demagnetization protective current value) is flowed, and works as the lower bridge arm output end of the intelligent power module 202
Electric current I < Ip when, when voltage Vin < Vref of the inverting input terminal of the voltage comparator ic 1, the voltage comparator ic 1
Output end be high-impedance state so that the PMOS tube Q3 end so that the overcurrent of the current foldback circuit unit 204
Signal output end D is protected to export low level, the intelligent power module 202 works normally；
As electric current I >=Ip of the lower bridge arm output end of the intelligent power module 202, the voltage comparator ic 1
The output end of voltage Vin >=Vref of inverting input terminal, the voltage comparator ic 1 are low level low resistive state, so that described
PMOS tube Q3 conducting, so that the overcurrent protection signal output end D of the current foldback circuit unit 204 exports high level,
The overcurrent protection pin of the i.e. described intelligent power module 202 can detect high level, when the overcurrent of the intelligent power module 202 is protected
When shield pin detects high level, the overcurrent protection function of the intelligent power module 202, the intelligent power module are triggered
202 stop working, and realize the purpose for protecting the intelligent power module 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can demagnetize to the compressor 203
Shield current value Ip is adjusted and sets, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the intelligent power module 202 cooperate different compressors 203 to work, the current foldback circuit unit
204 can also protect the compressor 203 well.
Fig. 6 is the electrical block diagram of the 5th embodiment of current foldback circuit of the present invention, together referring to Fig. 2 and Fig. 6, originally
In embodiment, the current foldback circuit unit includes operating voltage input terminal VCC, first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4, first capacitor C1, voltage comparator ic 1 and NMOS tube Q4.
Specifically, the first end of the first resistor R1 is the protective current value tune of the current foldback circuit unit 204
End B is saved, the first end of the first resistor R1 is connect with the pwm control signal output end PWM1 of the MCU201, and described first
The second end of resistance R1 is that the protective current value of the current foldback circuit unit 204 adjusts voltage sampling port C, first electricity
The second end of resistance R1 is connect with the voltage sampling port of the inverting input terminal of the voltage comparator ic 1 and the MCU201 respectively；
The first end of the second resistance R2 is connect with the second end of the first resistor R1, the second termination of the second resistance R2
Ground；The first capacitor C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is the overcurrent protection electricity
The sample rate current input terminal A of road unit 204, the first end of the first end of the 3rd resistor R3 and the current sampling resistor RS
Connection, the second end of the 3rd resistor R3 are connect with the non-inverting input terminal of the voltage comparator ic 1；The voltage comparator
The output end of IC1 is connect with the grid of the NMOS tube Q4；The drain electrode of the NMOS tube Q4 and operating voltage input terminal VCC connect
It connects, the drain electrode of the NMOS tube Q4 is also connect through the 4th resistance R4 with the grid of the NMOS tube Q4, the NMOS tube Q4
Source electrode be the current foldback circuit unit 204 overcurrent protection signal output end D, the source electrode of the NMOS tube Q4 with it is described
The overcurrent protection pin of intelligent power module 202 connects.It is understood that the NMOS tube Q4 in the present embodiment can also be with
It is substituted with IGBT pipe.
When the present embodiment current foldback circuit works normally, the electricity of the lower bridge arm output end of the intelligent power module 202
I < Ip (Ip is the compressor 203 demagnetization protective current value) is flowed, and works as the lower bridge arm output end of the intelligent power module 202
Electric current I < Ip when, when voltage Vin < Vref of the non-inverting input terminal of the voltage comparator ic 1, the voltage comparator ic 1
Output end be low level so that the NMOS tube Q4 end so that the overcurrent of the current foldback circuit unit 204 is protected
It protects signal output end D and exports low level, the intelligent power module 202 works normally；
As electric current I >=Ip of the lower bridge arm output end of the intelligent power module 202, the voltage comparator ic 1
The output end of voltage Vin >=Vref of non-inverting input terminal, the voltage comparator ic 1 are high level, so that the NMOS tube Q4
Conducting, so that the overcurrent protection signal output end D of the current foldback circuit unit 204 exports high level, i.e., the described intelligence
The overcurrent protection pin of energy power module 202 can detect high level, when the overcurrent protection pin of the intelligent power module 202 is examined
When measuring high level, the overcurrent protection function of the intelligent power module 202 is triggered, the intelligent power module 202 stops work
Make, realizes the purpose for protecting the intelligent power module 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can demagnetize to the compressor 203
Shield current value Ip is adjusted and sets, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the intelligent power module 202 cooperate different compressors 203 to work, the current foldback circuit unit
204 can also protect the compressor 203 well.
The present invention also provides a kind of air conditioner, which includes current foldback circuit, the structure of the current foldback circuit
And working principle can refer to above-described embodiment, details are not described herein.Naturally, since the air conditioner of the present embodiment uses
The technical solution of above-mentioned current foldback circuit, therefore the beneficial effect that the air conditioner has above-mentioned current foldback circuit all.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of current foldback circuit, which is characterized in that the current foldback circuit include intelligent power module, compression it is mechanical, electrical
Flow sampling resistor, MCU and current foldback circuit unit；Wherein:
The current sampling resistor, the electric current for the lower bridge arm output end to the intelligent power module sample；
The MCU is set for the demagnetization protective current value to the compressor, and is protected according to the demagnetization of setting
Current value exports corresponding pwm control signal to the current foldback circuit unit；
The current foldback circuit unit, electric current and MCU output for being sampled according to the current sampling resistor
The pwm control signal, export corresponding overcurrent protection signal to the intelligent power module, to the intelligent power mould
Block carries out overcurrent protection and carries out demagnetization protection to the compressor.
2. current foldback circuit as described in claim 1, which is characterized in that the first end of the current sampling resistor with it is described
The lower bridge arm output end of intelligent power module connects, the second end ground connection of the current sampling resistor；The current foldback circuit
The sample rate current input terminal of unit is connect with the first end of the current sampling resistor, the protection of the current foldback circuit unit
Current value adjustment end is connect with the pwm control signal output end of the MCU, the protective current value of the current foldback circuit unit
It adjusts voltage sampling port to connect with the voltage sampling port of the MCU, the overcurrent protection signal of the current foldback circuit unit is defeated
Outlet is connect with the overcurrent protection pin of the intelligent power module.
3. current foldback circuit as claimed in claim 2, which is characterized in that the current foldback circuit unit includes work electricity
Press input terminal, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, voltage comparator and PNP triode；
Wherein:
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, the first resistor
First end connect with the pwm control signal output end of the MCU, the second end of the first resistor is the overcurrent protection electricity
The protective current value of road unit adjusts voltage sampling port, and the second end of the first resistor is same with the voltage comparator respectively
The connection of the voltage sampling port of phase input terminal and the MCU；The second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input terminal of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end of resistance connects, and the second end of the 3rd resistor is connect with the inverting input terminal of the voltage comparator；The electricity
The output end of pressure comparator is connect through the 4th resistance with the base stage of the PNP triode；The emitter of the PNP triode
It is connect with operating voltage input terminal, the overcurrent protection letter of the extremely described current foldback circuit unit of the current collection of the PNP triode
Number output end, the collector of the PNP triode are connect with the overcurrent protection pin of the intelligent power module.
4. current foldback circuit as claimed in claim 2, which is characterized in that the current foldback circuit unit includes work electricity
Press input terminal, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, voltage comparator and NPN triode；
Wherein:
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, the first resistor
First end connect with the pwm control signal output end of the MCU, the second end of the first resistor is the overcurrent protection electricity
The protective current value of road unit adjusts voltage sampling port, and the second end of the first resistor is anti-with the voltage comparator respectively
The connection of the voltage sampling port of phase input terminal and the MCU；The second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input terminal of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end of resistance connects, and the second end of the 3rd resistor is connect with the non-inverting input terminal of the voltage comparator；The electricity
The output end of pressure comparator is connect with the base stage of the NPN triode；The collector and operating voltage of the NPN triode input
End connection, the collector of the NPN triode are also connect through the 4th resistance with the base stage of the NPN triode, the NPN
The overcurrent protection signal output end of the extremely described current foldback circuit unit of transmitting of triode, the transmitting of the NPN triode
Pole is connect with the overcurrent protection pin of the intelligent power module.
5. current foldback circuit as claimed in claim 2, which is characterized in that the current foldback circuit unit includes work electricity
Press input terminal, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, voltage comparator and PMOS tube；Its
In:
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, the first resistor
First end connect with the pwm control signal output end of the MCU, the second end of the first resistor is the overcurrent protection electricity
The protective current value of road unit adjusts voltage sampling port, and the second end of the first resistor is same with the voltage comparator respectively
The connection of the voltage sampling port of phase input terminal and the MCU；The second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input terminal of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end of resistance connects, and the second end of the 3rd resistor is connect with the inverting input terminal of the voltage comparator；The electricity
The output end of pressure comparator is connect with the grid of the PMOS tube；The drain electrode of the PMOS tube is connect with operating voltage input terminal,
The drain electrode of the PMOS tube is also connect through the 4th resistance with the grid of the PMOS tube, and the source electrode of the PMOS tube is described
The overcurrent protection signal output end of current foldback circuit unit, the overcurrent of the source electrode of the PMOS tube and the intelligent power module
Protection pin connection.
6. current foldback circuit as claimed in claim 2, which is characterized in that the current foldback circuit unit includes work electricity
Press input terminal, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, voltage comparator and NMOS tube；Its
In:
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, the first resistor
First end connect with the pwm control signal output end of the MCU, the second end of the first resistor is the overcurrent protection electricity
The protective current value of road unit adjusts voltage sampling port, and the second end of the first resistor is anti-with the voltage comparator respectively
The connection of the voltage sampling port of phase input terminal and the MCU；The second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；The first capacitor is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input terminal of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end of resistance connects, and the second end of the 3rd resistor is connect with the non-inverting input terminal of the voltage comparator；The electricity
The output end of pressure comparator is connect with the grid of the NMOS tube；The drain electrode of the NMOS tube is connect with operating voltage input terminal,
The drain electrode of the NMOS tube is also connect through the 4th resistance with the grid of the NMOS tube, and the source electrode of the NMOS tube is described
The overcurrent protection signal output end of current foldback circuit unit, the overcurrent of the source electrode of the NMOS tube and the intelligent power module
Protection pin connection.
7. such as current foldback circuit described in any one of claims 1 to 6, which is characterized in that bridge arm in the U phase of the MCU
Control signal output is connect with bridge arm control signal input in the U phase of the intelligent power module, in the V phase of the MCU
Bridge arm control signal output is connect with bridge arm control signal input in the V phase of the intelligent power module, the W of the MCU
Bridge arm control signal output is connect with bridge arm control signal input in the W phase of the intelligent power module in phase；The MCU
U phase lower bridge arm control signal output connect with the U phase lower bridge arm control signal input of the intelligent power module, it is described
The V phase lower bridge arm control signal output of MCU is connect with the V phase lower bridge arm control signal input of the intelligent power module,
The W phase lower bridge arm control signal output of the MCU and the W phase lower bridge arm control signal input of the intelligent power module connect
It connects.
8. such as current foldback circuit described in any one of claims 1 to 6, which is characterized in that the U of the intelligent power module
Phase output terminal is connect with the U phase input terminal of the compressor, V phase output terminal and the compressor of the intelligent power module
The connection of V phase input terminal, the W phase output terminal of the intelligent power module are connect with the W phase input terminal of the compressor.
9. a kind of air conditioner, which is characterized in that the air conditioner includes that overcurrent described in any item of the claim 1 to 8 such as is protected
Protection circuit.
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| CN201710345634.4A CN106961095B (en) | 2017-05-12 | 2017-05-12 | Current foldback circuit and air conditioner |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611931A (en) * | 2017-08-21 | 2018-01-19 | 安徽中家智康科技有限公司 | A kind of circuit that complete series compressor protection is realized by changing comparison voltage method |
| CN109946498B (en) * | 2017-12-20 | 2022-01-11 | 青岛海尔智能电子有限公司 | Linear compressor current sampling circuit and refrigeration equipment |
| CN108233339B (en) * | 2018-01-19 | 2019-11-22 | 广东美的制冷设备有限公司 | Intelligent power module, controller of air conditioner and air conditioner |
| CN109921398B (en) * | 2019-03-21 | 2021-07-16 | 广东美的制冷设备有限公司 | Overcurrent protection circuit and air conditioner |
| CN109950877A (en) * | 2019-04-24 | 2019-06-28 | 苏州易德龙科技股份有限公司 | A kind of three-phase motor driver overcurrent protective device |
| CN110160296B (en) * | 2019-05-23 | 2020-10-09 | 百尔制冷(无锡)有限公司 | Dynamic control method for current of screw parallel unit |
| CN111707918B (en) * | 2020-06-22 | 2023-09-08 | 卧龙电气驱动集团股份有限公司 | Self-integrated driving detection method and device for motor control system for air conditioner fan |
| CN112653082A (en) * | 2020-11-27 | 2021-04-13 | 凯迈（洛阳）测控有限公司 | Intelligent overcurrent protection module |
| CN113422350B (en) * | 2021-06-30 | 2023-03-10 | 佛山市顺德区美的电子科技有限公司 | Overcurrent protection circuit and air conditioning equipment |
| CN118249290A (en) * | 2021-07-19 | 2024-06-25 | 杭州先途电子有限公司 | Control circuit and controller |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003319546A (en) * | 2002-04-24 | 2003-11-07 | Sanyo Electric Co Ltd | Hybrid integrated circuit device comprising overcurrent protection circuit |
| CN1741372A (en) * | 2004-08-25 | 2006-03-01 | 三菱电机株式会社 | Semiconductor apparatus |
| JP2009198139A (en) * | 2008-02-25 | 2009-09-03 | Panasonic Corp | Brushless motor driving device for compressor of air conditioner |
| CN102150338A (en) * | 2008-09-08 | 2011-08-10 | 三菱电机株式会社 | Overcurrent detection circuit, inverter, compressor, air conditioner, and overcurrent detection circuit adjusting method |
| CN103312262A (en) * | 2012-03-15 | 2013-09-18 | 日立空调·家用电器株式会社 | Motor drive device, fluid compression system and air conditioner |
| CN103986121A (en) * | 2013-02-07 | 2014-08-13 | 株式会社牧田 | Motor-driven appliance and battery pack |
| WO2015098154A1 (en) * | 2013-12-27 | 2015-07-02 | 株式会社日立産機システム | Power conversion device and power conversion device control method |
| CN204965104U (en) * | 2015-09-17 | 2016-01-13 | 广东美的制冷设备有限公司 | Air conditioner and last electricity and current foldback circuit of intelligence power module thereof |
| CN105932636A (en) * | 2016-06-13 | 2016-09-07 | 国家电网公司 | Overcurrent protection circuit of power-frequency withstand voltage test |
-
2017
- 2017-05-12 CN CN201710345634.4A patent/CN106961095B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003319546A (en) * | 2002-04-24 | 2003-11-07 | Sanyo Electric Co Ltd | Hybrid integrated circuit device comprising overcurrent protection circuit |
| CN1741372A (en) * | 2004-08-25 | 2006-03-01 | 三菱电机株式会社 | Semiconductor apparatus |
| JP2009198139A (en) * | 2008-02-25 | 2009-09-03 | Panasonic Corp | Brushless motor driving device for compressor of air conditioner |
| CN102150338A (en) * | 2008-09-08 | 2011-08-10 | 三菱电机株式会社 | Overcurrent detection circuit, inverter, compressor, air conditioner, and overcurrent detection circuit adjusting method |
| CN103312262A (en) * | 2012-03-15 | 2013-09-18 | 日立空调·家用电器株式会社 | Motor drive device, fluid compression system and air conditioner |
| CN103986121A (en) * | 2013-02-07 | 2014-08-13 | 株式会社牧田 | Motor-driven appliance and battery pack |
| WO2015098154A1 (en) * | 2013-12-27 | 2015-07-02 | 株式会社日立産機システム | Power conversion device and power conversion device control method |
| CN204965104U (en) * | 2015-09-17 | 2016-01-13 | 广东美的制冷设备有限公司 | Air conditioner and last electricity and current foldback circuit of intelligence power module thereof |
| CN105932636A (en) * | 2016-06-13 | 2016-09-07 | 国家电网公司 | Overcurrent protection circuit of power-frequency withstand voltage test |
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