CN106961095A - Current foldback circuit and air-conditioner - Google Patents
Current foldback circuit and air-conditioner Download PDFInfo
- Publication number
- CN106961095A CN106961095A CN201710345634.4A CN201710345634A CN106961095A CN 106961095 A CN106961095 A CN 106961095A CN 201710345634 A CN201710345634 A CN 201710345634A CN 106961095 A CN106961095 A CN 106961095A
- Authority
- CN
- China
- Prior art keywords
- resistor
- current
- foldback circuit
- resistance
- spm
- 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.)
- Granted
Links
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
- H02H7/20—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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of current foldback circuit and air-conditioner, the current foldback circuit includes SPM, compressor, current sampling resistor, MCU and current foldback circuit unit；Current sampling resistor is used to sample to the electric current of the lower bridge arm output end of the SPM；MCU is used to set the demagnetization protective current value of the compressor, and according to the demagnetization protective current value of setting, exports corresponding pwm control signal to the current foldback circuit unit；Current foldback circuit unit is used for the pwm control signal of the electric current sampled according to the current sampling resistor and MCU outputs; corresponding overcurrent protection signal is exported to the SPM, to carry out overcurrent protection to the SPM and carry out demagnetization protection to the compressor.The present invention can effectively protect SPM 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 circuit and air-conditioner.
Background technology
IPM (Intelligent Power Module, IPM, SPM) is a kind of by power electronics and integrated
The power drive class product that circuit engineering is combined.Device for power switching and high-voltage driving circuit are integrated in one by SPM
Rise, compared with traditional discrete scheme, SPM wins increasing city with advantages such as its high integration, high reliability
, it is particularly suitable for the frequency converter and various inverters of motor, is frequency control, metallurgical machinery, electric propulsion, servo
Driving and a kind of desired power level electronic device of frequency-conversion domestic electric appliances (such as air-conditioner).However, SPM is in actual applications,
When the MCU for controlling the SPM work breaks down, the IGBT of a certain bridge arm inside SPM is opened
Prolonged conducting state will be in by closing pipe, so that the phenomenon of overcurrent occurs for SPM.
Reference picture 1, Fig. 1 is that the circuit structure of the embodiment of current foldback circuit one of SPM in the prior art shows
It is intended to, the current foldback circuit includes MCU101, SPM 102, compressor 103 and current sampling resistor RS1.Specifically
Bridge arm control signal output U+ is controlled with bridge arm in the U phases of the SPM 102 in ground, the U phases of the MCU101
Bridge arm control signal output V+ and the SPM 102 in signal input part U1+ connections, the V phases of the MCU101
V phases on the V1+ connections of bridge arm control signal input, in the W phases of the MCU101 bridge arm control signal output W+ with it is described
Bridge arm control signal input W1+ connections in the W phases of SPM 102；Bridge arm control signal under the U phases of the MCU101
Output end U- is connected with bridge arm control signal input U1- under the U phases of the SPM 102, the V phases of the MCU101
Lower bridge arm control signal output V- is connected with bridge arm control signal input V1- under the V phases of the SPM 102,
Bridge arm control signal output W- and bridge arm control signal under the W phases of the SPM 102 under the W phases of the MCU101
Input W1- connections；The U phase output terminals U of the SPM 102 is connected with the U phase inputs of the compressor 103,
The V phase output terminals V of the SPM 102 is connected with the V phase inputs of the compressor 103, the intelligent power mould
The W phase output terminals W of block 102 is connected with the W phase inputs of the compressor 103；The lower bridge arm of the SPM 102 is defeated
Go out end and first end of the overcurrent protection pin with the current sampling resistor RS1 is connected, the of the current sampling resistor RS1
Two ends are grounded.
The current foldback circuit of SPM shown in Fig. 1, works when the control SPM 102
When MCU101 breaks down, the IGBT switching tubes of a certain bridge arm inside the SPM 102 will be in for a long time
Conducting state so that the SPM 102 occur overcurrent phenomenon, when the SPM
During 102 generation overcurrent, the overcurrent protection function of the SPM 102 can detect over-current signal and automatically shut down
Its internal IGBT switching tube, realizes the purpose of the protection SPM 102.However, due to different compressors
Demagnetization protective current value is differed, therefore, when coordinating different compressors using different automatically controlled hardware, shown in Fig. 1
Current foldback circuit can not protect compressor well, or by adjusting (such as current sample electricity of the corresponding resistor in circuit
Resistance) resistance to reach the protection requirement to compressor, i.e., the current foldback circuit of the SPM shown in Fig. 1 it is general
Property is not strong.
The content of the invention
It is a primary object of the present invention to provide a kind of current foldback circuit, it is intended to strengthen the versatility of circuit.
To achieve these goals, the present invention provides a kind of current foldback circuit, and the current foldback circuit includes intelligence
Power model, 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 SPM is sampled；
The MCU, sets 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, for the electric current and the MCU sampled according to the current sampling resistor
The pwm control signal of output, exports corresponding overcurrent protection signal to the SPM, with to the intelligent work(
Rate module carries out overcurrent protection and carries out demagnetization protection to the compressor.
Preferably, the first end of the current sampling resistor is connected with the lower bridge arm output end of the SPM,
The second end ground connection of the current sampling resistor；The sample rate current input of the current foldback circuit unit is adopted with the electric current
Believe with the PWM controls of the MCU first end connection of sample circuit, the protective current value adjustable side of the current foldback circuit unit
The connection of number output end, the protective current value regulation voltage sample end of the current foldback circuit unit and the voltage of the MCU are adopted
Sample input is connected, the overcurrent protection signal output part of the current foldback circuit unit and the excessively stream of the SPM
Protection pin is connected.
Preferably, the current foldback circuit unit includes operating voltage input, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the first electric capacity, 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, described first
The first end of resistance is connected with the pwm control signal output end of the MCU, and the second end of the first resistor is protected for the excessively stream
The protective current value regulation voltage sample end of protection circuit unit, the second end of the first resistor respectively with the voltage comparator
In-phase input end and the MCU voltage sample end connection；The of the first end of the second resistance and the first resistor
Two ends are connected, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input, the first end of the 3rd resistor and the electric current
The first end connection of sampling resistor, the second end of the 3rd resistor is connected with the inverting input of the voltage comparator；Institute
The output end for stating voltage comparator is connected through the 4th resistance with the base stage of the PNP triode；The hair of the PNP triode
Emitter-base bandgap grading is connected with operating voltage input, and the excessively stream of the extremely described current foldback circuit unit of current collection of the PNP triode is protected
Signal output part is protected, the colelctor electrode of the PNP triode is connected with the overcurrent protection pin of the SPM.
Preferably, the current foldback circuit unit includes operating voltage input, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the first electric capacity, 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, described first
The first end of resistance is connected with the pwm control signal output end of the MCU, and the second end of the first resistor is protected for the excessively stream
The protective current value regulation voltage sample end of protection circuit unit, the second end of the first resistor respectively with the voltage comparator
Inverting input and the MCU voltage sample end connection；The of the first end of the second resistance and the first resistor
Two ends are connected, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input, the first end of the 3rd resistor and the electric current
The first end connection of sampling resistor, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；Institute
The output end for stating voltage comparator is connected with the base stage of the NPN triode；The colelctor electrode and operating voltage of the NPN triode
Input is connected, and the colelctor electrode of the NPN triode is also connected through the 4th resistance with the base stage of the NPN triode, institute
The overcurrent protection signal output part of the extremely described current foldback circuit unit of transmitting of NPN triode is stated, the NPN triode
Emitter stage is connected with the overcurrent protection pin of the SPM.
Preferably, the current foldback circuit unit includes operating voltage input, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the first electric capacity, voltage comparator and PMOS；Wherein：
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, described first
The first end of resistance is connected with the pwm control signal output end of the MCU, and the second end of the first resistor is protected for the excessively stream
The protective current value regulation voltage sample end of protection circuit unit, the second end of the first resistor respectively with the voltage comparator
In-phase input end and the MCU voltage sample end connection；The of the first end of the second resistance and the first resistor
Two ends are connected, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input, the first end of the 3rd resistor and the electric current
The first end connection of sampling resistor, the second end of the 3rd resistor is connected with the inverting input of the voltage comparator；Institute
The output end for stating voltage comparator is connected with the grid of the PMOS；The drain electrode of the PMOS connects with operating voltage input
Connect, the drain electrode of the PMOS is also connected through the 4th resistance with the grid of the PMOS, and the source electrode of the PMOS is
The overcurrent protection signal output part of the current foldback circuit unit, the source electrode of the PMOS and the SPM
Overcurrent protection pin is connected.
Preferably, the current foldback circuit unit includes operating voltage input, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the first electric capacity, voltage comparator and NMOS tube；Wherein：
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, described first
The first end of resistance is connected with the pwm control signal output end of the MCU, and the second end of the first resistor is protected for the excessively stream
The protective current value regulation voltage sample end of protection circuit unit, the second end of the first resistor respectively with the voltage comparator
Inverting input and the MCU voltage sample end connection；The of the first end of the second resistance and the first resistor
Two ends are connected, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input, the first end of the 3rd resistor and the electric current
The first end connection of sampling resistor, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；Institute
The output end for stating voltage comparator is connected with the grid of the NMOS tube；The drain electrode of the NMOS tube connects with operating voltage input
Connect, the drain electrode of the NMOS tube is also connected 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 part of the current foldback circuit unit, the source electrode of the NMOS tube and the SPM
Overcurrent protection pin is connected.
Preferably, the current foldback circuit unit includes operating voltage input, first resistor, second resistance, the 3rd
Resistance, the 4th resistance, the first electric capacity, voltage comparator and NMOS tube；Wherein：
The first end of the first resistor is the protective current value adjustable side of the current foldback circuit unit, described first
The first end of resistance is connected with the pwm control signal output end of the MCU, and the second end of the first resistor is protected for the excessively stream
The protective current value regulation voltage sample end of protection circuit unit, the second end of the first resistor respectively with the voltage comparator
Inverting input and the MCU voltage sample end connection；The of the first end of the second resistance and the first resistor
Two ends are connected, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The 3rd resistor
First end be the current foldback circuit unit sample rate current input, the first end of the 3rd resistor and the electric current
The first end connection of sampling resistor, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；Institute
The output end for stating voltage comparator is connected with the grid of the NMOS tube；The drain electrode of the NMOS tube connects with operating voltage input
Connect, the drain electrode of the NMOS tube is also connected through the 4th resistance with the grid of the PMOS, and the source electrode of the NMOS tube is
The overcurrent protection signal output part of the current foldback circuit unit, the source electrode of the NMOS tube and the SPM
Overcurrent protection pin is connected.
Preferably, bridge arm control signal output and bridge arm in the U phases of the SPM in the U phases of the MCU
Control signal input is connected, in the V phases of the MCU bridge arm control signal output with the V phases of the SPM
Bridge arm control signal input is connected, bridge arm control signal output and the W of the SPM in the W phases of the MCU
Bridge arm control signal input is connected in phase；Bridge arm control signal output and the SPM under the U phases of the MCU
U phases under bridge arm control signal input connect, bridge arm control signal output and the intelligent power under the V phases of the MCU
Bridge arm control signal input is connected under the V phases of module, bridge arm control signal output and the intelligence under the W phases of the MCU
Bridge arm control signal input is connected under the W phases of power model.
Preferably, the U phase output terminals of the SPM are connected with the U phase inputs of the compressor, the intelligence
The energy V phase output terminals of power model are connected with the V phase inputs of the compressor, the W phase output terminals of the SPM
It is connected with the W phase inputs 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
Flow protection circuit.
The present invention provides a kind of current foldback circuit, and the current foldback circuit includes SPM, compressor, electric current
Sampling resistor, MCU and current foldback circuit unit；The current sampling resistor, for the lower bridge to the SPM
The electric current of arm output end is sampled；The MCU, sets 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
Protection circuit unit is flowed, the PWM controls exported for the electric current sampled according to the current sampling resistor and the MCU
Signal processed, exports corresponding overcurrent protection signal to the SPM, to carry out excessively stream to the SPM
Protect and demagnetization protection is carried out to the compressor.Current foldback circuit of the present invention, the MCU can be moved back to the compressor
Magnetic protective current value is set, and according to the demagnetization protective current value of setting, exports corresponding pwm control signal, and
Described in the electric current and the MCU that the current foldback circuit unit can be sampled according to the current sampling resistor are exported
Pwm control signal, exports corresponding overcurrent protection signal to the SPM, to realize the protection intelligent power mould
The purpose of block and the compressor；Also, current foldback circuit of the present invention, because the MCU can be moved back to the compressor
Magnetic protective current value is set, therefore, and 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 is simple, reliability is high and low cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the electrical block diagram of the embodiment of current foldback circuit one of SPM 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 embodiment of current foldback circuit the 5th of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
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, reference picture 2, and Fig. 2 is current foldback circuit first embodiment of the present invention
Modular structure schematic diagram, in the present embodiment, the current foldback circuit includes MCU201, SPM 202, compressor
203rd, 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 SPM 202
Electric current sampled；
The MCU201, sets for the demagnetization protective current value to the compressor 203, and according to the institute of setting
Demagnetization protective current value is stated, corresponding pwm control signal is exported to the current foldback circuit unit 204；
The current foldback circuit unit 204, for according to the current sampling resistor RS electric currents sampled and institute
The pwm control signal of MCU201 outputs is stated, corresponding overcurrent protection signal is exported to the SPM 202, with
Overcurrent protection is carried out to the SPM 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 SPM 202
Bridge arm output end is connected, the second end ground connection of the current sampling resistor RS；The sampling electricity of the current foldback circuit unit 204
Stream input A is connected 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 connected with the pwm control signal output end PWM1 of the MCU201, the protection of the current foldback circuit unit 204
Current value adjustment voltage sample end C is connected with the voltage sample input ADC of the MCU201, the current foldback circuit unit
204 overcurrent protection signal output part D is connected with the overcurrent protection pin of the SPM 202.
In the present embodiment, bridge arm control signal output U+ and the SPM 202 in the U phases of the MCU201
U phases on the U1+ connections of bridge arm control signal input, in the V phases of the MCU201 bridge arm control signal output V+ with it is described
Bridge arm control signal in bridge arm control signal input V1+ connections in the V phases of SPM 202, the W phases of the MCU201
Output end W+ is connected with bridge arm control signal input W1+ in the W phases of the SPM 202；The U phases of the MCU201
Lower bridge arm control signal output U- is connected with bridge arm control signal input U1- under the U phases of the SPM 202,
Bridge arm control signal output V- and bridge arm control signal under the V phases of the SPM 202 under the V phases of the MCU201
Bridge arm control signal output W- and the SPM 202 W phases under input V1- connections, the W phases of the MCU201
Lower bridge arm control signal input W1- connections；The U phase output terminals U of the SPM 202 and the compressor 203 U
Phase input is connected, and the V phase output terminals V of the SPM 202 is connected with the V phase inputs of the compressor 203, institute
The W phase output terminals W of SPM 202 is stated to be connected with the W phase inputs of the compressor 203；The SPM
First end of the 202 lower bridge arm output end and overcurrent protection pin with the current sampling resistor RS is connected, and the electric current is adopted
Sample resistance RS the second end ground connection.
Fig. 3 is the electrical block diagram of current foldback circuit second embodiment of the present invention, in the lump reference picture 2 and Fig. 3, this
In embodiment, the current foldback circuit unit 204 include operating voltage input VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, the first electric capacity 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, the first resistor R1 first end is protected with the pwm control signal output end PWM1 of the MCU201 to connect
Connect, the second end of the first resistor R1 adjusts voltage sample end for the protective current value of the current foldback circuit unit 204
The in-phase input end and the voltage of the MCU201 of C, the first resistor R1 the second end respectively with the voltage comparator ic 1
Sampling end ADC connections；The first end of the second resistance R2 is connected with the second end of the first resistor R1, the second resistance
R2 the second end ground connection；The first electric capacity C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is institute
State sample rate current the input A, the 3rd resistor R3 of current foldback circuit unit 204 first end and current sample electricity
RS first end connection is hindered, the second end of the 3rd resistor R3 is connected with the inverting input of the voltage comparator ic 1；Institute
The output end for stating voltage comparator ic 1 is connected through the 4th resistance R4 with the base stage of the PNP triode Q1；The PNP tri-
Pole pipe Q1 emitter stage is connected with operating voltage input VCC, the extremely described overcurrent protection electricity of current collection of the PNP triode Q1
The overcurrent protection signal output part D of road unit 204, the colelctor electrode of the PNP triode Q1 and the SPM 202
Overcurrent protection pin is connected.
The present embodiment current foldback circuit is in original state, and the pwm control signal output end PWM1 of the MCU201 is defeated
Go out pwm control signal that frequency is f dutycycles D to the current foldback circuit unit 204 so that the current foldback circuit list
(namely input is to the in-phase input end of the voltage comparator ic 1 for the voltage at first resistor R1 the second end described in member 204
Voltage) Vref=VCC*R2/ (R1+R2) * D, wherein, duties of the D by the MCU201 pwm control signals exported
Than VCC is the operating voltage of the MCU201, and R1 represents the resistance of the first resistor R1, and R2 represents the second resistance R2
Resistance.The present embodiment can be achieved to adjust defeated by adjusting the dutycycle D of the pwm control signal of the MCU201 outputs
Enter the voltage Vref of in-phase input end to the voltage comparator ic 1 purpose.The present embodiment regulation is inputted to the voltage
The voltage Vref of comparator IC1 in-phase input end process is：The voltage sample end ADC sampled voltages of the MCU201 compare
The voltage Vref of device IC1 in-phase input end magnitude of voltage, when the MCU201 voltage Vref sampled magnitude of voltage not
During equal to preset voltage value Vref0, the MCU201 adjusts the dutycycle D of its pwm control signal exported so that input is extremely
The voltage Vref of the in-phase input end of the voltage comparator ic 1 is equal to preset voltage value Vref0.I.e. described in the present embodiment
MCU201 passes through the dutycycle D of pwm control signal exported to it real-time accurate control, you can realize in real time accurately
Control the purpose of the voltage Vref, and due in the present embodiment, the demagnetization protective current value of compressor 203 Ip=Vref/
Regulation can be achieved by adjusting the dutycycle D for the pwm control signal that the MCU201 is exported in RS, therefore, the present embodiment
The purpose of the demagnetization protective current value of compressor 203 Ip.
During the present embodiment current foldback circuit normal work, the electricity of the lower bridge arm output end of the SPM 202
Flow I<Ip (Ip is the compressor 203 demagnetization protective current value), and when the lower bridge arm output end of the SPM 202
Electric current I<During Ip, the voltage Vin of the inverting input of the voltage comparator ic 1<During Vref, the voltage comparator ic 1
Output end be high-impedance state so that PNP triode Q1 cut-off, and then cause the current foldback circuit unit 204
Overcurrent protection signal output part D exports low level, the normal work of SPM 202；
As electric current I >=Ip of the lower bridge arm output end of the SPM 202, the voltage comparator ic 1
Voltage Vin >=Vref of inverting input, the output end of the voltage comparator ic 1 is low level low resistive state so that described
PNP triode Q1 is turned on, and then causes the high electricity of overcurrent protection signal output part D outputs of the current foldback circuit unit 204
Flat, i.e., the overcurrent protection pin of described SPM 202 can detect high level, when the mistake of the SPM 202
When stream protection pin detects high level, the overcurrent protection function of the SPM 202, the intelligent power mould are triggered
Block 202 is stopped, and realizes the purpose for protecting the SPM 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can be demagnetized to the compressor 203
Shield current value Ip is adjusted and set, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the SPM 202 coordinate the different work of compressors 203, the current foldback circuit unit
204 can also protect the compressor 203 well.
The present embodiment current foldback circuit, the MCU201 can be set to the demagnetization protective current value of the compressor
It is fixed, and according to the demagnetization protective current value of setting, export corresponding pwm control signal, and the current foldback circuit list
(the lower bridge arm of i.e. described SPM 202 is defeated for the electric current that member 204 can be sampled according to the current sampling resistor RS
Go out the exported electric current in end) and the pwm control signals that are exported of the MCU201, the corresponding overcurrent protection signal of output is extremely
The SPM 202, to realize the purpose for protecting the SPM 202 and the compressor 203；Also,
The present embodiment current foldback circuit, because the MCU201 can be set to the demagnetization protective current value of the compressor 203
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
Have the advantages that circuit structure is simple, reliability is high and low cost.
Fig. 4 is the electrical block diagram of current foldback circuit 3rd embodiment of the present invention, in the lump reference picture 2 and Fig. 4, this
In embodiment, the current foldback circuit unit 204 include operating voltage input VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, the first electric capacity C1, voltage comparator ic 1 and NPN triode Q2.
Specifically, the first end of the first resistor R1 is adjusted for the protective current value of the current foldback circuit unit 201
End B is saved, the first end of the first resistor R1 is connected with the pwm control signal output end PWM1 of the MCU201, described first
Resistance R1 the second end is the protective current value regulation voltage sample end C of the current foldback circuit unit 201, first electricity
The second end for hindering R1 connects with the inverting input of the voltage comparator ic 1 and the voltage sample end ADC of the MCU201 respectively
Connect；The first end of the second resistance R2 is connected with the second end of the first resistor R1, the second end of the second resistance R2
Ground connection；The first electric capacity C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is the overcurrent protection
The sample rate current input A of circuit unit 204, the first end of the 3rd resistor R3 and the first of the current sampling resistor RS
End connection, the second end of the 3rd resistor R3 is connected with the in-phase input end of the voltage comparator ic 1；The voltage ratio compared with
Device IC1 output end is connected with the base stage of the NPN triode Q2；The colelctor electrode and operating voltage of the NPN triode Q2 is defeated
Enter and hold VCC to connect, the base stage of the colelctor electrode of the NPN triode Q2 also through the 4th resistance R4 Yu the NPN triode Q2
Connection, the overcurrent protection signal output part D of the extremely described current foldback circuit unit 204 of transmitting of the NPN triode Q2, institute
The emitter stage for stating NPN triode Q2 is connected with the overcurrent protection pin of the SPM 202.
During the present embodiment current foldback circuit normal work, the electricity of the lower bridge arm output end of the SPM 202
Flow I<Ip (Ip is the compressor 203 demagnetization protective current value), and when the lower bridge arm output end of the SPM 202
Electric current I<During Ip, the voltage Vin of the in-phase input end of the voltage comparator ic 1<During Vref, the voltage comparator ic 1
Output end be low level so that NPN triode Q1 cut-off, and then cause the mistake of the current foldback circuit unit 204
Flow protection signal output end D output low levels, the normal work of SPM 202；
As electric current I >=Ip of the lower bridge arm output end of the SPM 202, the voltage comparator ic 1
Voltage Vin >=Vref of in-phase input end, the output end of the voltage comparator ic 1 is high level so that the PNP triode
Q1 is turned on, and then causes the overcurrent protection signal output part D output high level of the current foldback circuit unit 204, i.e., described
The overcurrent protection pin of SPM 202 can detect high level, when the overcurrent protection pin of the SPM 202
When detecting high level, the overcurrent protection function of the SPM 202 is triggered, the SPM 202 stops
Work, realizes the purpose for protecting the SPM 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can be demagnetized to the compressor 203
Shield current value Ip is adjusted and set, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the SPM 202 coordinate the different work of compressors 203, 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, in the lump reference picture 2 and Fig. 5, this
In embodiment, the current foldback circuit unit 204 include operating voltage input VCC, first resistor R1, second resistance R2,
3rd resistor R3, the 4th resistance R4, the first electric capacity C1, voltage comparator ic 1 and PMOS Q3.
Specifically, the first end of the first resistor R1 is adjusted for the protective current value of the current foldback circuit unit 204
End B is saved, the first end of the first resistor R1 is connected with the pwm control signal output end PWM1 of the MCU201, described first
Resistance R1 the second end is the protective current value regulation voltage sample end C of the current foldback circuit unit 204, first electricity
The second end for hindering R1 connects with the in-phase input end of the voltage comparator ic 1 and the voltage sample end ADC of the MCU201 respectively
Connect；The first end of the second resistance R2 is connected with the second end of the first resistor R1, the second end of the second resistance R2
Ground connection；The first electric capacity C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is the overcurrent protection
The sample rate current input A of circuit unit 204, the first end of the 3rd resistor R3 and the first of the current sampling resistor RS
End connection, the second end of the 3rd resistor R3 is connected with the inverting input of the voltage comparator ic 1；The voltage ratio compared with
Device IC1 output end is connected with the grid of the PMOS Q3；The drain electrode of the PMOS Q3 connects with operating voltage input VCC
Connect, the drain electrode of the PMOS Q3 is also connected through the 4th resistance R4 with the grid of the PMOS Q3, the PMOS Q3
Source electrode be the current foldback circuit unit 204 overcurrent protection signal output part D, the source electrode of the PMOS Q3 with it is described
The overcurrent protection pin connection of SPM 202.It should be noted that the PMOS Q3 in the present embodiment can be used
IGBT pipes are substituted.
During the present embodiment current foldback circuit normal work, the electricity of the lower bridge arm output end of the SPM 202
Flow I<Ip (Ip is the compressor 203 demagnetization protective current value), and when the lower bridge arm output end of the SPM 202
Electric current I<During Ip, the voltage Vin of the inverting input of the voltage comparator ic 1<During Vref, the voltage comparator ic 1
Output end be high-impedance state so that PMOS Q3 cut-off, and then cause the excessively stream of the current foldback circuit unit 204
Protection signal output end D exports low level, the normal work of SPM 202；
As electric current I >=Ip of the lower bridge arm output end of the SPM 202, the voltage comparator ic 1
Voltage Vin >=Vref of inverting input, the output end of the voltage comparator ic 1 is low level low resistive state so that described
PMOS Q3 is turned on, and then make it that the overcurrent protection signal output part D of the current foldback circuit unit 204 exports high level,
The overcurrent protection pin of i.e. described SPM 202 can detect high level, when the excessively stream of the SPM 202 is protected
When shield pin detects high level, the overcurrent protection function of the SPM 202, the SPM are triggered
202 are stopped, and realize the purpose for protecting the SPM 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can be demagnetized to the compressor 203
Shield current value Ip is adjusted and set, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the SPM 202 coordinate the different work of compressors 203, the current foldback circuit unit
204 can also protect the compressor 203 well.
Fig. 6 is the electrical block diagram of current foldback circuit fourth embodiment of the present invention, in the lump reference picture 2 and Fig. 6, this
In embodiment, the current foldback circuit unit includes operating voltage input VCC, first resistor R1, second resistance R2, the 3rd
Resistance R3, the 4th resistance R4, the first electric capacity C1, voltage comparator ic 1 and NMOS tube Q4.
Specifically, the first end of the first resistor R1 is adjusted for the protective current value of the current foldback circuit unit 204
End B is saved, the first end of the first resistor R1 is connected with the pwm control signal output end PWM1 of the MCU201, described first
Resistance R1 the second end is the protective current value regulation voltage sample end C of the current foldback circuit unit 204, first electricity
Resistance R1 the second end is connected with the inverting input of the voltage comparator ic 1 and the voltage sample end of the MCU201 respectively；
The first end of the second resistance R2 is connected with the second end of the first resistor R1, the second termination of the second resistance R2
Ground；The first electric capacity C1 is in parallel with the second resistance R2；The first end of the 3rd resistor R3 is overcurrent protection electricity
The sample rate current input A of road unit 204, the first end of the 3rd resistor R3 and the first end of the current sampling resistor RS
Connection, the second end of the 3rd resistor R3 is connected with the in-phase input end of the voltage comparator ic 1；The voltage comparator
IC1 output end is connected with the grid of the NMOS tube Q4；The drain electrode of the NMOS tube Q4 connects with operating voltage input VCC
Connect, the drain electrode of the NMOS tube Q4 is also connected through the 4th resistance R4 with the grid of the PMOS Q4, the NMOS tube Q4
Source electrode be the current foldback circuit unit 204 overcurrent protection signal output part D, the source electrode of the NMOS tube Q4 with it is described
The overcurrent protection pin connection of SPM 202.It is understood that the NMOS tube Q4 in the present embodiment can also
Substituted with IGBT pipes.
During the present embodiment current foldback circuit normal work, the electricity of the lower bridge arm output end of the SPM 202
Flow I<Ip (Ip is the compressor 203 demagnetization protective current value), and when the lower bridge arm output end of the SPM 202
Electric current I<During Ip, the voltage Vin of the in-phase input end of the voltage comparator ic 1<During Vref, the voltage comparator ic 1
Output end be low level so that NMOS tube Q4 cut-off, and then make it that the excessively stream of the current foldback circuit unit 204 is protected
Protect signal output part D output low levels, the normal work of SPM 202；
As electric current I >=Ip of the lower bridge arm output end of the SPM 202, the voltage comparator ic 1
Voltage Vin >=Vref of in-phase input end, the output end of the voltage comparator ic 1 is high level so that the NMOS tube Q4
Conducting, and then cause the overcurrent protection signal output part D output high level of the current foldback circuit unit 204, i.e., described intelligence
The overcurrent protection pin of energy power model 202 can detect high level, when the overcurrent protection pin of the SPM 202 is examined
When measuring high level, the overcurrent protection function of the SPM 202 is triggered, the SPM 202 stops work
Make, realize the purpose for protecting the SPM 202.
Also, the MCU201 in the present embodiment current foldback circuit is protected due to that can be demagnetized to the compressor 203
Shield current value Ip is adjusted and set, and therefore, the versatility of the present embodiment current foldback circuit is stronger, when in the present embodiment
When the MCU201 and the SPM 202 coordinate the different work of compressors 203, the current foldback circuit unit
204 can also protect the compressor 203 well.
The present invention also provides a kind of air-conditioner, and the air-conditioner includes current foldback circuit, the structure of the current foldback circuit
And operation principle can refer to above-described embodiment, it will not be repeated here.Naturally, because the air-conditioner of the present embodiment is used
The technical scheme of above-mentioned current foldback circuit, therefore the air-conditioner has all beneficial effects of above-mentioned current foldback circuit.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of current foldback circuit, it is characterised in that the current foldback circuit includes SPM, compresses 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 SPM is sampled；
The MCU, sets 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, is exported for the electric current sampled according to the current sampling resistor and the MCU
The pwm control signal, corresponding overcurrent protection signal is exported to the SPM, with to the intelligent power mould
Block carries out overcurrent protection and carries out demagnetization protection to the compressor.
2. current foldback circuit as claimed in claim 1, it is characterised in that the first end of the current sampling resistor with it is described
The lower bridge arm output end connection of SPM, the second end ground connection of the current sampling resistor；The current foldback circuit
The sample rate current input of unit is connected with the first end of the current sampling circuit, the protection of the current foldback circuit unit
Current value adjustment end is connected with the pwm control signal output end of the MCU, the protective current value of the current foldback circuit unit
Regulation voltage sample end is connected with the voltage sample input of the MCU, the overcurrent protection letter of the current foldback circuit unit
Number output end is connected with the overcurrent protection pin of the SPM.
3. current foldback circuit as claimed in claim 2, it is characterised in that the current foldback circuit unit includes work electricity
Press input, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, 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 be connected with the pwm control signal output end of the MCU, the second end of the first resistor is overcurrent protection electricity
The protective current value regulation voltage sample end of road unit, the second end of the first resistor is same with the voltage comparator respectively
Phase input and the MCU voltage sample end connection；Second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end connection of resistance, the second end of the 3rd resistor is connected with the inverting input of the voltage comparator；The electricity
The output end of pressure comparator is connected through the 4th resistance with the base stage of the PNP triode；The emitter stage of the PNP triode
It is connected with operating voltage input, the overcurrent protection letter of the extremely described current foldback circuit unit of current collection of the PNP triode
Number output end, the colelctor electrode of the PNP triode is connected with the overcurrent protection pin of the SPM.
4. current foldback circuit as claimed in claim 2, it is characterised in that the current foldback circuit unit includes work electricity
Press input, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, 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 be connected with the pwm control signal output end of the MCU, the second end of the first resistor is overcurrent protection electricity
The protective current value regulation voltage sample end of road unit, the second end of the first resistor is anti-with the voltage comparator respectively
Phase input and the MCU voltage sample end connection；Second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end connection of resistance, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；The electricity
The output end of pressure comparator is connected with the base stage of the NPN triode；The colelctor electrode of the NPN triode is inputted with operating voltage
End connection, the colelctor electrode of the NPN triode is also connected through the 4th resistance with the base stage of the NPN triode, the NPN
The overcurrent protection signal output part of the extremely described current foldback circuit unit of transmitting of triode, the transmitting of the NPN triode
Pole is connected with the overcurrent protection pin of the SPM.
5. current foldback circuit as claimed in claim 2, it is characterised in that the current foldback circuit unit includes work electricity
Press input, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, voltage comparator and PMOS；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 be connected with the pwm control signal output end of the MCU, the second end of the first resistor is overcurrent protection electricity
The protective current value regulation voltage sample end of road unit, the second end of the first resistor is same with the voltage comparator respectively
Phase input and the MCU voltage sample end connection；Second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end connection of resistance, the second end of the 3rd resistor is connected with the inverting input of the voltage comparator；The electricity
The output end of pressure comparator is connected with the grid of the PMOS；The drain electrode of the PMOS is connected with operating voltage input,
The drain electrode of the PMOS is also connected through the 4th resistance with the grid of the PMOS, and the source electrode of the PMOS is described
The overcurrent protection signal output part of current foldback circuit unit, the excessively stream of the source electrode of the PMOS and the SPM
Protection pin is connected.
6. current foldback circuit as claimed in claim 2, it is characterised in that the current foldback circuit unit includes work electricity
Press input, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, 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 be connected with the pwm control signal output end of the MCU, the second end of the first resistor is overcurrent protection electricity
The protective current value regulation voltage sample end of road unit, the second end of the first resistor is anti-with the voltage comparator respectively
Phase input and the MCU voltage sample end connection；Second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end connection of resistance, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；The electricity
The output end of pressure comparator is connected with the grid of the NMOS tube；The drain electrode of the NMOS tube is connected with operating voltage input,
The drain electrode of the NMOS tube is also connected 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 part of current foldback circuit unit, the excessively stream of the source electrode of the NMOS tube and the SPM
Protection pin is connected.
7. current foldback circuit as claimed in claim 2, it is characterised in that the current foldback circuit unit includes work electricity
Press input, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, 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 be connected with the pwm control signal output end of the MCU, the second end of the first resistor is overcurrent protection electricity
The protective current value regulation voltage sample end of road unit, the second end of the first resistor is anti-with the voltage comparator respectively
Phase input and the MCU voltage sample end connection；Second end of the first end of the second resistance and the first resistor
Connection, the second end ground connection of the second resistance；First electric capacity is in parallel with the second resistance；The of the 3rd resistor
One end is the sample rate current input of the current foldback circuit unit, the first end of the 3rd resistor and the current sample
The first end connection of resistance, the second end of the 3rd resistor is connected with the in-phase input end of the voltage comparator；The electricity
The output end of pressure comparator is connected with the grid of the NMOS tube；The drain electrode of the NMOS tube is connected with operating voltage input,
The drain electrode of the NMOS tube is also connected through the 4th resistance with the grid of the PMOS, and the source electrode of the NMOS tube is described
The overcurrent protection signal output part of current foldback circuit unit, the excessively stream of the source electrode of the NMOS tube and the SPM
Protection pin is connected.
8. the current foldback circuit as any one of claim 1 to 7, it is characterised in that bridge arm in the U phases of the MCU
Control signal output is connected with bridge arm control signal input in the U phases of the SPM, in the V phases of the MCU
Bridge arm control signal output is connected with bridge arm control signal input in the V phases of the SPM, the W of the MCU
Bridge arm control signal output is connected with bridge arm control signal input in the W phases of the SPM in phase；The MCU
U phases under bridge arm control signal output be connected with bridge arm control signal input under the U phases of the SPM, it is described
Bridge arm control signal output is connected with bridge arm control signal input under the V phases of the SPM under MCU V phases,
Bridge arm control signal output connects with bridge arm control signal input under the W phases of the SPM under the W phases of the MCU
Connect.
9. the current foldback circuit as any one of claim 1 to 7, it is characterised in that the U of the SPM
Phase output terminal is connected with the U phase inputs of the compressor, V phase output terminals and the compressor of the SPM
V phases input is connected, and the W phase output terminals of the SPM are connected with the W phase inputs of the compressor.
10. a kind of air-conditioner, it is characterised in that the air-conditioner is protected including excessively stream as claimed in any one of claims 1-9 wherein
Protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710345634.4A CN106961095B (en) | 2017-05-12 | 2017-05-12 | Current foldback circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710345634.4A CN106961095B (en) | 2017-05-12 | 2017-05-12 | Current foldback circuit and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106961095A true CN106961095A (en) | 2017-07-18 |
| CN106961095B CN106961095B (en) | 2019-02-12 |
Family
ID=59481852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710345634.4A Active CN106961095B (en) | 2017-05-12 | 2017-05-12 | Current foldback circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106961095B (en) |
Cited By (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 |
| CN108233339A (en) * | 2018-01-19 | 2018-06-29 | 广东美的制冷设备有限公司 | Intelligent power module, controller of air conditioner and air conditioner |
| CN109921398A (en) * | 2019-03-21 | 2019-06-21 | 广东美的制冷设备有限公司 | Current foldback circuit and air conditioner |
| CN109946498A (en) * | 2017-12-20 | 2019-06-28 | 青岛海尔智能电子有限公司 | Linear compressor current sampling circuit and refrigeration equipment |
| 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 |
| CN110160296A (en) * | 2019-05-23 | 2019-08-23 | 百尔制冷(无锡)有限公司 | Screw parallel unit electric current dynamic control method |
| CN111707918A (en) * | 2020-06-22 | 2020-09-25 | 卧龙电气驱动集团股份有限公司 | Self-integration driving detection method and device of motor control system for air-conditioning fan |
| CN112653082A (en) * | 2020-11-27 | 2021-04-13 | 凯迈（洛阳）测控有限公司 | Intelligent overcurrent protection module |
| CN113422350A (en) * | 2021-06-30 | 2021-09-21 | 佛山市顺德区美的电子科技有限公司 | Overcurrent protection circuit and air conditioning equipment |
| CN113904579A (en) * | 2021-07-19 | 2022-01-07 | 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 |
Cited By (14)
| 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 |
| CN109946498A (en) * | 2017-12-20 | 2019-06-28 | 青岛海尔智能电子有限公司 | Linear compressor current sampling circuit and refrigeration equipment |
| 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 |
| CN108233339A (en) * | 2018-01-19 | 2018-06-29 | 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 |
| CN109921398A (en) * | 2019-03-21 | 2019-06-21 | 广东美的制冷设备有限公司 | Current foldback 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 |
| CN110160296A (en) * | 2019-05-23 | 2019-08-23 | 百尔制冷(无锡)有限公司 | Screw parallel unit electric current dynamic control method |
| CN111707918A (en) * | 2020-06-22 | 2020-09-25 | 卧龙电气驱动集团股份有限公司 | Self-integration driving detection method and device of motor control system for air-conditioning fan |
| 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 |
| CN113422350A (en) * | 2021-06-30 | 2021-09-21 | 佛山市顺德区美的电子科技有限公司 | Overcurrent protection circuit and air conditioning equipment |
| CN113904579A (en) * | 2021-07-19 | 2022-01-07 | 杭州先途电子有限公司 | Control circuit and controller |
| CN113904579B (en) * | 2021-07-19 | 2024-08-13 | 杭州先途电子有限公司 | Control circuit and controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106961095B (en) | 2019-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106961095A (en) | Current foldback circuit and air-conditioner | |
| CN105515472B (en) | Motor drive current detection circuit and control system | |
| CN108318797A (en) | System and method for desaturation detection | |
| CN103973134B (en) | Continuous-current plant and improve the pwm pulse control method of its power factor | |
| CN106655768A (en) | Constant-current input power supply control circuit | |
| CN104882856A (en) | High-precision over-current detection circuit | |
| CN203983941U (en) | A kind of overcurrent protection testing circuit that is applied to heavy-duty motor driving chip | |
| CN207426787U (en) | A kind of power supply and its charging circuit | |
| CN206379719U (en) | Overcurrent protection peripheral circuit and electrical equipment | |
| CN108075622A (en) | Power converter gate drive control method, device, controller and converter | |
| CN102035381A (en) | BOOST circuit with adjusting starting voltage | |
| CN217133305U (en) | Aging circuit for diode | |
| CN208094432U (en) | Power inverter protects circuit | |
| CN108063436B (en) | Intelligent power module, controller of air conditioner and air conditioner | |
| CN206517300U (en) | A kind of constant current input power controls circuit | |
| CN106953624B (en) | MOSFET parallel overcurrent protection circuit | |
| CN209329673U (en) | Overcurrent protection circuit, switching tube drive circuit and electric equipment | |
| CN209461383U (en) | Relay drive circuit, relay | |
| CN202405740U (en) | Current-limiting protection circuit of alternating current power supply loop | |
| CN103944147B (en) | A kind of protective circuit of switch power source and its control method | |
| CN209088519U (en) | A kind of current foldback circuit | |
| CN208707298U (en) | A kind of current foldback circuit and motor driven systems, electric system | |
| CN206584926U (en) | A kind of gate protection circuit | |
| CN207096857U (en) | A kind of constant-current circuit of amplifier output voltage clamper in driving tube threshold voltage | |
| CN217469447U (en) | Overcurrent protection circuit and electrical equipment |
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 |