CN207603197U - A kind of circuit of DC brushless motor overcurrent protection - Google Patents
A kind of circuit of DC brushless motor overcurrent protection Download PDFInfo
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- CN207603197U CN207603197U CN201721553597.8U CN201721553597U CN207603197U CN 207603197 U CN207603197 U CN 207603197U CN 201721553597 U CN201721553597 U CN 201721553597U CN 207603197 U CN207603197 U CN 207603197U
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- 230000004224 protection Effects 0.000 title claims abstract description 68
- 230000005347 demagnetization Effects 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims description 13
- 230000005856 abnormality Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The utility model discloses a kind of circuits of DC brushless motor overcurrent protection, are related to electric motor protecting technical field.The circuit of the DC brushless motor overcurrent protection; including MCU control circuit, current sample amplifying circuit, intelligent power module inverter circuit, motor demagnetization protection circuit, electric motor short circuit protection circuit and load motor circuit; wherein, the output terminal of the MCU control circuit is connect with the first input end of intelligent power module inverter circuit.The circuit of the DC brushless motor overcurrent protection; it is overloaded in load motor; in the case of extremely short-circuit etc. high currents of load motor; using different protected modes, motor normal operation and the security reliability of circuit devcie are protected, so as to ensure that motor will not be demagnetized because of motor so that motor failure; it also ensures under motor abnormality short-circuit conditions; in circuit device will not short-circuit failure, reduce failure rate, reduce maintenance cost, reduce influence user experience.
Description
Technical field
The utility model is related to electric motor protecting technical field, specially a kind of electricity of DC brushless motor overcurrent protection
Road.
Background technology
Universal with electric appliance with the development of economy, DC frequency conversion technology also reaches its maturity, such as convertible frequency air-conditioner, frequency conversion ice
Case, variable-frequency washing machine etc..During the use of direct current generator, when motor load is overweight, current of electric can be caused excessive, reached
Motor demagnetization current so that demagnetization phenomenon occurs in motor；When occurring short circuit inside motor, long-time amplitude pulse current,
It can lead to the overcurrent short-circuit failure of intelligent power module.Apparatus failure can be caused to shut down in this way, influence use and the body of user
It tests.For example, motor can be caused normally not start and operate in use, since motor demagnetizes in air-conditioning；Or due to motor
Short circuit causes the short-circuit failure of control panel.
Utility model content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of circuit of DC brushless motor overcurrent protection,
It solves the problems, such as to lead to motor demagnetization, intelligent power module short-circuit failure by current of electric is excessive.
(2) technical solution
In order to achieve the above object, the utility model is achieved by the following technical programs：A kind of DC brushless motor mistake
The circuit of current protection, including MCU control circuit, current sample amplifying circuit, intelligent power module inverter circuit, motor demagnetization
Circuit, electric motor short circuit protection circuit and load motor circuit are protected, wherein, the output terminal of the MCU control circuit and intelligent work(
The first input end connection of rate module inverter circuit, the first output terminal and load motor of the intelligent power module inverter circuit
The input terminal connection of circuit, the second output terminal of the intelligent power module inverter circuit and the current sample amplifying circuit
Input terminal connects, the input terminal of the third output terminal and electric motor short circuit protection circuit of the intelligent power module inverter circuit
Connection, the first output terminal and the motor of the current sample amplifying circuit, which demagnetize, protects circuit input end to connect, the electricity
The second output terminal of stream amplifier circuit is connect with the first input end of the MCU control circuit, the electric motor short circuit protection
The output terminal of circuit is connect with the second input terminal of the intelligent power module inverter circuit, the motor demagnetization protection circuit
Output terminal is connect with the second input terminal of the MCU control circuit, the 4th output terminal of the intelligent power module inverter circuit
It is connect with the third input terminal of the MCU control circuit, when the load motor overload, flows through noninductive resistance RS1, RS2
Electric current increase, the current sample amplifying circuit amplifies resistance RS1, RS2 both end voltage, when motor demagnetizes protection circuit detection
When reaching fiducial value to current sample amplifying circuit output valve, the motor demagnetization protection circuit output low level signal is described
MCU control circuit detects the low level signal of the motor demagnetization protection circuit output, and MCU control circuit stops output PWM
Signal is to intelligent power module inverter circuit.
(3) advantageous effect
The utility model provides a kind of circuit of DC brushless motor overcurrent protection, has following advantageous effect：
(1) circuit of the DC brushless motor overcurrent protection, can solve excessive by motor load, lead to current of electric mistake
Greatly, the phenomenon that motor is caused demagnetization phenomenon occur, can also solve the intelligent power module short-circuit failure as caused by electric motor short circuit, from
And ensure that motor can be run in the reasonable scope, optimize user experience while machine reliability service is improved.
(2) circuit of the DC brushless motor overcurrent protection can solve to lead to motor demagnetization, intelligence by current of electric is excessive
Can power module short-circuit failure the problem of, motor operating current reach motor demagnetization current protection when or motor inside around
When short circuit occurs for group, triggering MCU controller protections so as to ensure the safety in motor operation service life and intelligent power module, carry
High machine reliability service.
(3) circuit of the DC brushless motor overcurrent protection is overloaded in load motor, and load motor is extremely short-circuit etc. big
Under current conditions, using different protected modes, motor normal operation and the security reliability of circuit devcie are protected, so as to ensure
Motor will not demagnetize because of motor so that motor failure, also ensures under motor abnormality short-circuit conditions, device will not in circuit
Short-circuit failure reduces failure rate, reduces maintenance cost, and reducing influences user experience.
Description of the drawings
Fig. 1 is the general illustration of the utility model；
Fig. 2 is the overall circuit figure of the utility model；
Fig. 3 is the current sample amplification circuit diagram of the utility model；
Fig. 4 is the circuit diagram of the intelligent power module inverter circuit of the utility model；
Fig. 5 is the circuit diagram of the motor demagnetization protection circuit of the utility model；
Fig. 6 is the electric motor short circuit protection circuit of the circuit of the utility model.
In figure：101 MCU controllers, 102 current sample amplifying circuits, 103 intelligent power module inverter circuits, 104 electricity
Machine demagnetization protection circuit, 105 electric motor short circuits protection circuit, 106 load motor circuits.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.The utility model provides a kind of technical solution：
As shown in figures 1 to 6, a kind of circuit of DC brushless motor overcurrent protection, including MCU control circuit 101, electric current
Amplifier circuit 102, intelligent power module inverter circuit 103, motor demagnetization protection circuit 104, electric motor short circuit protection circuit
105 and load motor circuit 106；
Wherein, the output terminal of MCU control circuit 101 is connect with the first input end of intelligent power module inverter circuit 103,
First output terminal of intelligent power module inverter circuit 103 is connect with the input terminal of load motor circuit 106, intelligent power module
The second output terminal of inverter circuit 103 is connect with the input terminal of current sample amplifying circuit 102, intelligent power module inversion electricity
The third output terminal on road 103 is connect with the input terminal of electric motor short circuit protection circuit 105, and the first of current sample amplifying circuit 102
Output terminal demagnetizes with motor protects 104 input terminal of circuit to connect, and second output terminal and the MCU of current sample amplifying circuit 102 are controlled
The first input end connection of circuit 101 processed, the output terminal and intelligent power module inverter circuit of electric motor short circuit protection circuit 105
103 the second input terminal connection, the output terminal and the second input terminal of MCU control circuit 101 of motor demagnetization protection circuit 104 connect
It connects, the 4th output terminal of intelligent power module inverter circuit 103 is connect with the third input terminal of MCU control circuit 101.
When load motor overload, the electric current increase of noninductive resistance RS1, RS2 are flowed through, in resistance RS1, RS2 both ends shape
Increase into voltage value, 102 output end voltage value of current sample amplifying circuit can also increase；Circuit 104 is protected to examine when motor demagnetizes
It measures backward end input value to have reached or the comparing voltage value higher than in-phase input end, motor demagnetization protection circuit 104 is defeated
Go out low level signal；When it is low level signal that MCU control circuit 101, which detects input terminal, stop output drive signal to intelligence
Energy power module inverter circuit 103, so as to stop the motor operation of load motor circuit 106；
When load motor overload or there is short circuit, the immediate current increase of noninductive resistance RS1, RS2 are flowed through, in electricity
It hinders RS1, RS2 both ends and forms voltage value increase, electric motor short circuit protection 105 homophase input terminal voltage value of circuit also increases；Work as motor
Short-circuit protection circuit 105 detects comparing voltage value of the homophase input terminal voltage value up to or over reverse input end, motor
Short-circuit protection circuit 105 exports high level to intelligent power module inverter circuit 103；When intelligent power module inverter circuit 103
When detecting input terminal as high level, it is output that intelligent power module U3, which stops 21/22/23 pin, while exports low level and arrive
MCU control circuits 101；When it is low level signal that MCU control circuit 101, which detects input terminal, stop output drive signal
To intelligent power module inverter circuit 103；
As shown in figures 1 to 6, MCU control circuit 101 includes resistance R3, capacitance C12, MCU control chip U1, resistance R3, electricity
Hold the pin 7 that C12 is connected to MCU control chips U1；Resistance R3 is connected to 5V power supplys；Capacitance C12 is connected to 5V power supplys.
As shown in Fig. 1-6 to Fig. 5, current sample amplifying circuit 102 include current sample amplifying circuit include resistance RS1,
Resistance RS2, resistance R8, resistance R21, resistance R12, resistance R14, resistance R19, resistance R22, resistance R16, operational amplifier U5；
The pin 49 of U1 that the output terminal series connection R16 of current sample amplifying circuit 102 is connected to MCU control circuit 101 connects；Electric current
The output terminal series connection R16 of amplifier circuit 102 is connected to the input terminal of motor demagnetization protection circuit 104.
As shown in figures 1 to 6, intelligent power module inverter circuit 103 includes capacitance E1, capacitance C1, capacitance E2, capacitance C2, electricity
Hold E3, capacitance C3, intelligent power module U3, the output pin 35,34,33,38,37,36 of MCU control circuit 101 connects respectively
In the input pin 5,6,7,10,11,12 of the U3 of intelligent power module inverter circuit 103, intelligent power module inverter circuit
The output pin 14 of 103 U3 is connected to the input pin 39 of the U1 of MCU control circuit 101.
As shown in figures 1 to 6, motor demagnetization protection circuit 104, including resistance R17, resistance R23, capacitance C10, resistance R10,
Resistance R11, resistance R13, resistance R18, capacitance C9, triode Q1, resistance R9, resistance R7, capacitance C7；Motor demagnetization protection electricity
104 input terminal series resistance R16 of road is connected to the output terminal of current sample amplifying circuit 102；Motor demagnetization protection circuit 104 is defeated
Output terminal is connected to the input pin 39 of the U1 of MCU control circuits 101.
As shown in figures 1 to 6, electric motor short circuit protection circuit 105, including resistance R6, capacitance C6, resistance R1, resistance R4, compares
Device U4, resistance R2, resistance R5, capacitance C5；Electric motor short circuit protection 105 input terminal of circuit is connected to resistance RS1, RS2；Electric motor short circuit
Protection 105 output terminal of circuit is connected to the U3 input terminals pin 15 of intelligent power module inverter circuit 103.
As shown in figures 1 to 6, load motor circuit 106, including direct current generator M；Direct current generator M input terminals are connected to intelligent work(
21,22,23 pin of output terminal of the U3 of rate module inverter circuit 103.
A kind of circuit of DC brushless motor overcurrent protection provided by the utility model, when motor operation, electric current leads to
18,/19,/20 3 pins outflow of the U3 of overpower module inverter circuit 103, flows through resistance RS1, RS2 to 5V power supplys, and
Resistance RS1, RS2 both ends form voltage value V1.
The operational amplifier that voltage value V1 is connected in current sample amplifying circuit 102 is formed at resistance RS1, RS2 both ends
On U5, amplified voltage signal V2 is connected on the AD mouths (AN103) of MCU control circuit 101, and MCU control circuit 101 receives
Analog signal on 49 feet judges estimated current value height by tabling look-up.Amplified letter in current sample amplifying circuit 102
Number V2, while it is connected to the reverse input end of comparator U4 in motor demagnetization protection circuit 104；If motor demagnetization protection circuit
The reverse input end voltage V2 of comparator U4 then exports high level less than positive input voltage V3, comparator U4 in 104, place
In normal operating conditions；If the reverse input end voltage V2 of comparator U4 is defeated higher than positive in motor demagnetization protection circuit 104
Enter terminal voltage V3, comparator U4 then exports low level so that triode Q1 is connected, output low level to MCU control circuit 101
39 feet trigger MCU internal interrupts, and the output pin 35,34,33,38,37,36 for stopping MCU control circuit 101 exports PWM letters
Number so that intelligent power module inverter circuit 103 stops the output of 21/22/23 pin, so as to stop motor operating.
When situations such as motor internal abnormality, appearance short circuit being, flowing through current of electric can increase, and be presented as resistance moment
The voltage value V1 that RS1, RS2 both ends are formed；This voltage value V1 can be input to electric motor short circuit protection circuit 105 in comparator U4 just
To 3 foot of input terminal；When the input voltage V4 of reverse input end 2 feet of the voltage value V1 less than comparator U4, the output of comparator U4
1 foot is held to export low level, in normal operating conditions；When the input of reverse input end 2 feet of the voltage value V1 more than comparator U4
1 foot of the output terminal output high level of voltage V4, comparator U4, and it is input to drawing for U3 in intelligent power module inverter circuit 103
Foot 15；The pin 15 of U3 detects high level in intelligent power module inverter circuit 103, first stops the defeated of 21/22/23 pin
Go out so that motor shuts down；The pin 14 of U3 exports low level signal simultaneously, is input to the 39 of MCU control circuit 101
Foot triggers MCU internal interrupts, stops 35,34,33,38,37,36 output pwm signal of output pin of MCU control circuits 101.
As shown in figures 1 to 6, the circuit of a kind of DC brushless motor overcurrent protection provided by the utility model, it is worked
Journey includes the following contents：
S1, load motor operating, electric current form voltage value V1 (according to electricity by resistance RS1, RS2, and at resistance both ends
Pressure=resistance * electric currents)；
When S2, load motor work, amplifier U5 amplification voltage value V1 in current sample amplifying circuit 102, and export amplification
Voltage value V2 afterwards；And it is input in motor demagnetization protection circuit 104.
S3, as shown in 1-6, if amplification after voltage value V2, more than motor demagnetize protection circuit 104 in comparator positive terminal
7 feet of comparison voltage V3, comparator U4 then export low level so that triode Q1 is connected, and output low level to MCU controls electricity
39 feet on road 101 trigger MCU internal interrupts, and the output pin 35,34,33,38,37,36 for stopping MCU control circuits 101 is defeated
Go out pwm signal so that intelligent power module inverter circuit 103 stops the output of 21/22/23 pin, so as to stop motor operating.
S4, as shown in 1-6, if resistance RS1, RS2 both ends formed voltage value V1, more than electric motor short circuit protect circuit 105
1 foot of the output terminal output high level of the voltage value V4 of the reversed input pin 2 of middle U4, comparator U4, and it is input to intelligent power mould
The pin 15 of U3 in block inverter circuit 103；The pin 15 of U3 detects high level in intelligent power module inverter circuit 103, first
Stop the output of 21/22/23 pin so that motor shuts down；The pin 14 of U3 exports low level signal simultaneously, is input to
39 feet of MCU control circuit 101, trigger MCU internal interrupts, stop MCU control circuit 101 output pin 35,34,33,
38th, 37,36 output pwm signal.
In conclusion the circuit of the DC brushless motor overcurrent protection, overloads in load motor, load motor is extremely short
In the case of the high currents such as road, using different protected modes, motor normal operation and the security reliability of circuit devcie are protected, from
And ensureing motor will not demagnetize because of motor so that motor failure, also ensures under motor abnormality short-circuit conditions, device in circuit
Part will not short-circuit failure, reduce failure rate, reduce maintenance cost, reduce influence user experience.
The preferable specific embodiment of the above, only the utility model, but the scope of protection of the utility model is not
This is confined to, in the technical scope that any one skilled in the art discloses in the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (6)
1. a kind of circuit of DC brushless motor overcurrent protection, it is characterised in that：It is adopted including MCU control circuit (101), electric current
Sample amplifying circuit (102), intelligent power module inverter circuit (103), motor demagnetization protection circuit (104), electric motor short circuit protection
Circuit (105) and load motor circuit (106)；
Wherein, the first input end of the output terminal of the MCU control circuit (101) and intelligent power module inverter circuit (103)
Connection, the first output terminal of the intelligent power module inverter circuit (103) connect with the input terminal of load motor circuit (106)
It connects, the second output terminal of the intelligent power module inverter circuit (103) and the input of the current sample amplifying circuit (102)
End connection, third output terminal and the electric motor short circuit protection circuit (105) of the intelligent power module inverter circuit (103)
Input terminal connects, and the first output terminal and the motor of the current sample amplifying circuit (102), which demagnetize, protects circuit (104) defeated
Enter end connection, the second output terminal of the current sample amplifying circuit (102) and the first of the MCU control circuit (101) defeated
Enter end connection, the of the output terminal of electric motor short circuit protection circuit (105) and the intelligent power module inverter circuit (103)
Two input terminals connect, the output terminal of motor demagnetization protection circuit (104) and the second of the MCU control circuit (101) defeated
Enter end connection, the of the 4th output terminal of the intelligent power module inverter circuit (103) and the MCU control circuit (101)
Three input terminals connect.
2. a kind of circuit of DC brushless motor overcurrent protection according to claim 1, it is characterised in that：The electric current
Amplifier circuit (102) including resistance RS1, resistance RS2, resistance R8, resistance R21, resistance R12, resistance R14, resistance R19,
Resistance R22, resistance R16, operational amplifier U5, the resistance R8 are connected to 8 feet of the operational amplifier U5, the resistance
R8 is connected to the in-phase input end pin 5 of the operational amplifier U5, and the resistance R8 is connected to the resistance R21, institute
The in-phase input end pin 5 that resistance R21 is connected to the operational amplifier U5 is stated, the resistance R21 is connected to the fortune
The input terminal pin 4 of amplifier U5 is calculated, the resistance R12 is connected to the in-phase input end pin 3 of the operational amplifier U5,
The resistance R12 is connected to the inverting input pin 6 of the operational amplifier U5, and the resistance R12 is connected to described
The output pin 7 of operational amplifier U5, the resistance R14 is connected to the in-phase input end pin 3 of operational amplifier U5, described
The inverting input pin 2 of the resistance R19 connections operational amplifier U5, the resistance R22 connections operational amplifier U5
Inverting input pin 2, the output pin 1 of the resistance R22 connections operational amplifier U5.
3. a kind of circuit of DC brushless motor overcurrent protection according to claim 1, it is characterised in that：The intelligence
Power module inverter circuit (103) includes MCU controller U1, intelligent power module U3, the output pin of the MCU controllers U1
35th, 34,33,38,37,36 input pin 5,6,7,10,11,12 for being connected to the intelligent power module U3, the intelligence
The output pin 14 of energy power module U3 is connected to the input pin 39 of the MCU controllers U1.
4. a kind of circuit of DC brushless motor overcurrent protection according to claim 1, it is characterised in that：The motor
Demagnetization protection circuit (104) includes resistance R17, resistance R23, capacitance C10, resistance R10, resistance R11, resistance R13, resistance R18,
Capacitance C9, triode Q1, resistance R9, resistance R7, capacitance C7, the resistance R17 is series at resistance R16 and comparator U4 is reversely defeated
Enter to hold pin 6, connection and comparator U4 reverse input ends pin 6, the resistance R10, resistance after resistance R23, capacitance C10 parallel connections
11 are connected to comparator U4 noninverting inputs pin 5, and the resistance R13 is connected to comparator U4 inverse output terminals pin 7, described
Resistance R18 is connected to comparator U4 inverse output terminals pin 7, and the resistance R18 is connected to the triode Q1 base stages, the electricity
Hold C9 and be connected to the triode Q1 base stages and collector, the triode Q1 grounded collectors, the resistance R9 connections and institute
Triode Q1 emitters are stated, the resistance R7 is connected to 5V power supplys and the resistance R9.
5. a kind of circuit of DC brushless motor overcurrent protection according to claim 1, it is characterised in that：The motor
Short-circuit protection circuit (105) includes resistance R6, capacitance C6, resistance R1, resistance R4, comparator U4, resistance R2, resistance R5, capacitance
C5, the resistance R6 are connected to resistance RS1, RS2, and the resistance R6 is connected to comparator U4 in-phase input ends pin 3, the electricity
Hold C6 and be connected to comparator U4 in-phase input ends pin 3, the capacitance C6 is connected to 5V power supplys, and the resistance R1, which is connected to, to be compared
Device U4 inverting inputs pin 2, the resistance R4 are connected to the comparator U4 inverting inputs pin 2, and the resistance R1 connects
5V power supplys are connected to, the resistance R2 is connected to 5V power supplys, and the resistance R2 is connected to comparator U4 output pins 1, the electricity
Resistance R5 is connected to comparator U4 output pins 1, and the resistance R5 is connected to intelligent power module U3 pins 15, the capacitance C5
The resistance R5 is connected to, the capacitance C5 is connected to 5V power supplys.
6. a kind of circuit of DC brushless motor overcurrent protection according to claim 1, it is characterised in that：The load
Output pin 21,22,23 of the motor circuit (106) including motor M, intelligent power module U3, the intelligent power module U3 connects
It is connected to the motor M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721553597.8U CN207603197U (en) | 2017-11-20 | 2017-11-20 | A kind of circuit of DC brushless motor overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721553597.8U CN207603197U (en) | 2017-11-20 | 2017-11-20 | A kind of circuit of DC brushless motor overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207603197U true CN207603197U (en) | 2018-07-10 |
Family
ID=62760114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721553597.8U Expired - Fee Related CN207603197U (en) | 2017-11-20 | 2017-11-20 | A kind of circuit of DC brushless motor overcurrent protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207603197U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687697A (en) * | 2018-12-12 | 2019-04-26 | 珠海格力电器股份有限公司 | A kind of guard method of IPM, device, storage medium and IPM module |
| CN110289796A (en) * | 2019-07-19 | 2019-09-27 | 广东美的制冷设备有限公司 | Two-phase-three-phase modulations mode switching circuit and equipment |
| CN110518549A (en) * | 2019-08-20 | 2019-11-29 | 珠海格力电器股份有限公司 | The current foldback circuit of DC brushless motor |
| CN110854812A (en) * | 2019-10-10 | 2020-02-28 | 珠海格力电器股份有限公司 | Motor overcurrent protection circuit and method |
-
2017
- 2017-11-20 CN CN201721553597.8U patent/CN207603197U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687697A (en) * | 2018-12-12 | 2019-04-26 | 珠海格力电器股份有限公司 | A kind of guard method of IPM, device, storage medium and IPM module |
| CN110289796A (en) * | 2019-07-19 | 2019-09-27 | 广东美的制冷设备有限公司 | Two-phase-three-phase modulations mode switching circuit and equipment |
| CN110518549A (en) * | 2019-08-20 | 2019-11-29 | 珠海格力电器股份有限公司 | The current foldback circuit of DC brushless motor |
| CN110854812A (en) * | 2019-10-10 | 2020-02-28 | 珠海格力电器股份有限公司 | Motor overcurrent protection circuit and method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180710 |
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| CF01 | Termination of patent right due to non-payment of annual fee |