CN203788206U - Low-voltage large-power direct current motor control circuit with over-current protection - Google Patents
Low-voltage large-power direct current motor control circuit with over-current protection Download PDFInfo
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- CN203788206U CN203788206U CN201420207598.7U CN201420207598U CN203788206U CN 203788206 U CN203788206 U CN 203788206U CN 201420207598 U CN201420207598 U CN 201420207598U CN 203788206 U CN203788206 U CN 203788206U
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Abstract
The utility model discloses a low-voltage large-power direct current motor control circuit with over-current protection. The control circuit comprises an external large-power direct current power supply, an over-current protection circuit, a control signal amplification circuit and a power amplification circuit. The control circuit is advantaged by high efficiency, large driving power, high reliability, long service life and low cost. The response rate and the driving power of a product are raised. The multistage protection measures protect normal working of the circuit effectively. The control circuit has good application prospects.
Description
Technical field
The utility model relates to low-pressure high-power DC MOTOR CONTROL field, more specifically, relates to a kind of control circuit of direct current machine of the low-voltage high-power with overcurrent protection.
Background technology
Motor is as main electromechanical energy conversion device at present, and range of application has spreaded all in the household electrical appliances and consumption electronic product of industrial and agricultural production, communications and transportation, national defence scientific research, health care and various daily lifes.Along with the appearance of savings battery, the use of the direct current machine of various low pressure is also more extensive.For the DC motor to these low pressure starts, braking, the physical quantitys such as rotating control, voltage, electric current, power are controlled, and need to configure suitable drive circuit to motor.Along with the difference of application product, the driving power of direct current machine requires different, and the type of drive of various direct current machines is also various.Common drive circuit has following two kinds:
1) as shown in Figure 1, a termination external dc power of the coil of relay, the other end is connected on the C utmost point of triode, and the triode E utmost point connects power supply ground.Drive signal to control conducting or shutoff between triode C, the E utmost point through being loaded into the B utmost point of triode after electric resistance partial pressure, thus control relay adhesive and disconnection.The switch termination direct current machine of relay can be controlled the running of direct current machine.When driving signal input high level, triode conducting, relay adhesive, motor rotation; When driving signal input low level, triode cut-off, relay disconnects, motor stalling.When triode becomes when cut-off from conducting, relay winding generates a larger self induction voltage, so at the coil two ends of relay reverse parallel connection twin zener dioder, to absorb this electromotive force.The advantage of sort circuit is that circuit is simple, and drive motors power can be according to using different relays to determine.But it is larger that sort circuit is affected by relay, for actuating force, require larger relay, adopt transistor drive circuit may occur driving hypodynamic situation, and may greatly reduce the useful life of circuit.
2), in order to address the above problem, people have found out the stronger drive circuit of another kind of power drive power.As shown in Figure 2, with metal-oxide-semiconductor, replace triode, can realize equally the function of control relay adhesive and disconnection.Utilize the characteristic of the super-high-current of metal-oxide-semiconductor, promote control end and bear current range.In the occasion of large electric current, between the D utmost point of metal-oxide-semiconductor and the S utmost point, can bear larger electric current and flow through, greatly promoted the actuating force of Control end.Circuit after improvement has not only increased the actuating force of circuit, and has reduced the infringement to switching device, has promoted greatly the useful life of circuit.In governing system, relay frequently adhesive disconnects, still has a great impact the useful life for circuit like this, and also higher in the cost price of the control circuit repeat circuit of super-large current, make the cost of whole circuit also relatively high, in actual production, do not calculate.
Utility model content
The utility model is in order to solve above-mentioned the deficiencies in the prior art part, provides a kind of efficiency high, and driving power is large, and reliability is high, long service life, the low-pressure high-power DC motor control circuit with overcurrent protection that cost is low.
The purpose of this utility model can reach by the following technical programs:
A low-pressure high-power DC motor control circuit with overcurrent protection, comprises external dc power, also comprise current foldback circuit and with its connection control signal amplifying circuit and power amplification circuit;
Described current foldback circuit comprises control chip IC1, resistance R 5-R10, resistance R 16-R18, resistance R 26, resistance R 28, triode Q12 and capacitor C 1, capacitor C 2;
Described control signal amplifying circuit comprises triode Q10, Q11 and resistance R 15, R21;
Described power amplification circuit comprises sustained diode 3, D4, D5, D8, D10, metal-oxide-semiconductor Q1-Q3 and Electric Machine Control interface P2;
One end of the first pin OutPutA connecting resistance R5 of described control chip IC1, also connects digitally by resistance R 6; One end of the 2nd pin InPutA-connecting resistance R10 of control chip IC1, also connects the collector electrode of triode Q12 by resistance R 26, the emitter of triode Q12 connects digitally; One end of the 3rd pin InPutA+ connecting resistance R9 of control chip IC1, also meets the 7th pin OutPutB of control chip IC1; The 4th pin GND of control chip IC1 connects digitally; The 5th pin InPutB+ of control chip IC1, by one end of resistance R 7 connecting resistance R28, also connects one end of one end of capacitor C 1, one end of capacitor C 2 and resistance R 18; The 6th pin InPutB-of control chip IC1 meets the 7th pin OutPutB of control chip IC1 by resistance R 16; The other end, the other end of resistance R 5, the other end of the other end of resistance R 9 and resistance R 10 of the 8th pin VCC connecting resistance R28 of control chip IC1; The 8th pin VCC of control chip IC1 also connects external dc power;
The 6th pin InPutB-of the other end of capacitor C 1, C2 and control chip IC1 connects digitally, and the other end of capacitor C 1 also connects digitally by resistance R 17; Another termination external dc power ground of resistance R 18 connects digitally simultaneously; The base stage of triode Q12 meets the 2nd pin InPutA-of control chip IC1 by resistance R 8;
The first pin OutPutA of control chip IC1 connects the base stage of triode Q10 and the base stage of triode Q11 by resistance R 15; The collector electrode of triode Q10 connects external dc power, and the emitter of triode Q10 connects the emitter of triode Q11, and the collector electrode of triode Q11 connects digitally, and the emitter of triode Q10 also connects digitally by R21;
The 1st pin of sustained diode 8 connects the 2nd pin of external dc power and sustained diode 8, the 3rd pin of sustained diode 8 meets K end, the D utmost point of metal-oxide-semiconductor Q1, the D utmost point of the D utmost point of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and the Electric Machine Control interface P2 of fly-wheel diode D3, and the A termination of sustained diode 3 digitally; The S utmost point of metal-oxide-semiconductor Q1 connects digitally, and the G utmost point of metal-oxide-semiconductor Q1 connects the A end of fly-wheel diode D4 and one end of resistance R 1; The S utmost point of metal-oxide-semiconductor Q2 connects digitally, and the G utmost point of metal-oxide-semiconductor Q2 connects the A end of fly-wheel diode D5 and one end of resistance R 2; The S utmost point of metal-oxide-semiconductor Q3 connects digitally, and the G utmost point of metal-oxide-semiconductor Q3 connects the A end of fly-wheel diode D10 and enables one end of resistance R 3; The K end of the K termination sustained diode 10 of sustained diode 4, the K end of sustained diode 5, the other end of resistance R 1 are, the other end of the other end of resistance R 2 and resistance R 3; The emitter of another termination triode Q10 of resistance R 2.
Said external DC power supply is outside high-power DC power supply; The utility model adopts control chip IC1 as the control end of automatic overcurrent protection; Real-Time Monitoring electric current, controls the generation of pwm control signal by detecting the size of electric current, thereby controls turning on and off of MOS switching tube Q10; make motor rotation or stall, form defencive function.If after circuital current overcurrent, motor stalling, whole circuit output voltage reduces, and can cause output current to reduce, and when electric current recovers normal range (NR), circuit recovers again normal operating conditions, so this circuit also has self-recovering function.Due to this specific character of this circuit, greatly increased the dependable with function of circuit, life of product is also greatly improved;
This circuit metal-oxide-semiconductor can be used as power amplifying device use in parallel, has improved greatly the driving power to outside direct current machine; Sustained diode 8 is fast recovery diode, absorbs rapidly the inverse electromotive force of motor with protection metal-oxide-semiconductor drive circuit in the moment of motor stalling.The high-speed switch characteristic of metal-oxide-semiconductor, is well positioned to meet the frequent starting of direct current machine and the requirement of speed governing, the useful life of also having improved circuit.Meanwhile, with respect to the scheme of the relay drive motors of super-large current, what the cost of metal-oxide-semiconductor will be low is many, and this more can adapt to actual production application demand.
Described resistance R 28, R7, R5, R9, R10 are pull-up resistor, and resistance R 18, R16, R6, R21 are divider resistance, and resistance R 17 is current-limiting resistance, and resistance R 15, R1, R2, R3, R8, R26 are for enabling resistance, and capacitor C 1, C2 are filter capacitor.
Compared with prior art, the utlity model has following outstanding beneficial effect: whole circuit efficiency is high, and driving power is large, good reliability, long service life, cost is low.The reaction rate and the driving rate that have improved product, the effective protective circuit of multi-stage protection measure is normally worked, and has good application prospect.
Accompanying drawing explanation
Fig. 1 is the triode control relay driving circuit principle figure of direct current machine in prior art.
Fig. 2 is the metal-oxide-semiconductor control relay driving circuit principle figure of direct current machine in prior art.
Fig. 3 is the circuit theory diagrams of the utility model specific embodiment.
Wherein, 1-current foldback circuit; 2-control signal amplifying circuit; 3-power amplification circuit; IC1-control chip; R28, R7, R5, R9, R10-pull-up resistor, R18 R6, R16, R21-divider resistance, R17-current-limiting resistance; Q1, Q2, Q3-MOS pipe; Q10, Q11, Q12-triode, D3, D4, D5, D8, D10-fly-wheel diode, the outside high-power DC power supply of POWER-; the outside high-power DC power supply of P4-ground; R15, R1, R2, R3, R8, R26-enable resistance, C1, C2-filter capacitor, P2-Electric Machine Control interface.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described, but execution mode of the present utility model is not limited to this.
Fig. 3 forms specific embodiment of the utility model 1.
With reference to Fig. 3, the present embodiment comprises control chip IC1, pull-up resistor R28, R7, divider resistance R18, R16, current-limiting resistance R17, metal-oxide-semiconductor Q1, Q2, Q3, triode Q10, Q11, Q12, sustained diode 3, D4, D5, D8, D10.Its design feature is also to comprise outside high-power DC power supply, outside high-power DC power supply ground P4, pull-up resistor R5, R9, R10, enable resistance R 15, R1, R2, R3, R8, R26, divider resistance R6, R21, filter capacitor C1, C2, Electric Machine Control interface P2;
Described outside high-power DC power supply and filter capacitor C1, C2; control chip IC1, pull-up resistor R5, R9, R10, R28, R7, divider resistance R6, R16, R18, R8, R26; current-limiting resistance R17, outside high-power DC power supply ground P4 forms current foldback circuit.The first pin of control chip IC1 connects to draw one end of resistance R 5 and one end of divider resistance R6 and export control signal OutPutA and is connected circuit below, the 2nd pin of control chip IC1 connects and draws one end of resistance R 10 and one end of resistance R 26, the 3rd pin of control chip IC1 connects and draws one end of resistance R 9 and the 7th pin of control chip IC1, the 4th pin of control chip IC1 connects digitally the other end with divider resistance R6, the 5th pin of control chip IC1 connects the one end of drawing resistance R 7, one end of divider resistance R18, one end of filter capacitor C1, one end of filter capacitor C2, one end of the 6th pin connecting resistance R16 of control chip IC1 and digitally, the other end of the 7th pin connecting resistance R16 of control chip IC1 and the 3rd pin of control chip IC1, the 8th pin of control chip IC1 connects outside high-power DC power supply.The outside high-power DC power supply of another termination of pull-up resistor R5, R9, R10, the outside high-power DC power supply of a termination of pull-up resistor R28, the other end connects the other end that draws resistance R 7.Another termination of filter capacitor C1, C2 digitally.The outside high-power DC power supply ground P4 of another termination of divider resistance R18 and one end of current-limiting resistance R17.Another termination of current-limiting resistance R17 digitally.The C utmost point of another termination triode Q12 of resistance R 26, the E utmost point of triode Q12 connects digitally, one end of the B utmost point connecting resistance R8 of triode Q12, another termination control signal InPutA-signal input of resistance R 8.
Described outside high-power DC power supply and triode Q10, Q11, enable resistance R 15, and divider resistance R21 forms control signal amplifying circuit.The B utmost point of triode Q10 connects and enables one end of resistance R 15 and the B utmost point of triode Q11, the C utmost point of triode Q10 connects outside high-power DC power supply, and one end that the E utmost point of triode meets the E utmost point of triode Q11, divider resistance R21 is connected circuit below with control signal output DrivM1-.The other end that enables resistance R 15 meets the control signal OutPutA of current foldback circuit output.The C utmost point of triode Q11 connects digitally.Another termination of divider resistance R21 digitally.
Described outside high-power DC power supply and metal-oxide-semiconductor Q1, Q2, Q3, enable resistance R 1, R2, R3, sustained diode 3, D4, D5, D8, D10, and Electric Machine Control interface P2 forms power amplification circuit.The 1st pin of sustained diode 8 connects the 2nd pin of outside high-power DC power supply and diode D8, the 3rd pin of diode D8 connects the K end, the D utmost point of metal-oxide-semiconductor Q1 of fly-wheel diode D3, the D utmost point of the D utmost point of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 is connected system below with Electric Machine Control interface P2, to control the state of direct current machine.The A termination of sustained diode 3 digitally.The S utmost point of metal-oxide-semiconductor Q1 connects digitally, and the G utmost point of metal-oxide-semiconductor Q1 connects the A end of fly-wheel diode D4 and enables one end of resistance R 1.The S utmost point of metal-oxide-semiconductor Q2 connects digitally, and the G utmost point of metal-oxide-semiconductor Q2 connects the A end of fly-wheel diode D5 and enables one end of resistance R 2.The S utmost point of metal-oxide-semiconductor Q3 connects digitally, and the G utmost point of metal-oxide-semiconductor Q3 connects the A end of fly-wheel diode D10 and enables one end of resistance R 3.The K end of the K termination sustained diode 10 of sustained diode 4, the K of sustained diode 5 hold, enable the control signal output DrivM1-of the other end of resistance R 1, the other end that enables resistance R 2, the other end that enables resistance R 3 and control signal amplifying circuit.
In the present embodiment, described current-limiting resistance R17 is for observation circuit electric current.Described triode Q10 is used for amplifying control signal.Described triode Q11 makes triode Q11 conducting while ending for motor conducting, forms discharge loop protection front stage circuits.Described metal-oxide-semiconductor Q1, Q2, Q3 are used for improving driving power, better the running of drive motors.
The operation principle of the present embodiment:
With reference to Fig. 3, the 5th, 6,7 pin of control chip IC1 and resistance R 16, R7, R17, R18, R28 and filter capacitor C1, C2 form current limliting loop, the incoming level of restriction control chip IC1 the 3rd pin.When circuit is normally worked, the 5th pin voltage of control chip IC1 is higher than the 6th pin voltage of control chip IC1, and the 7th pin of control chip IC1 is exported high level.Because the 7th pin of control chip IC1 and the 3rd pin of control chip IC1 are connected, so the 3rd pin of control chip IC1 is also high level.
When Electric Machine Control pwm signal InputA-is high level, conducting between the C utmost point of triode Q12, the E utmost point, the 2nd pin level of control chip IC1 becomes low level, and the 1st pin output control signal OutPutA of control chip IC1 is high level.High-level control signal OutPutA enables through one the B utmost point that resistance R 15 acts on triode Q10 and triode Q11 afterwards, between the C utmost point of conducting between the C utmost point of control triode Q10, the E utmost point, Q11, the E utmost point, ends, and drives signal DrivM1-output high level.High level drives signal DrivM1-to be loaded in power amplifying part circuit.Drive signal DrivM1-to act on the other end of resistance R 1, the other end of the other end of resistance R 2, resistance R 3 is controlled the metal-oxide-semiconductor conducting of 3 tunnel parallel connections simultaneously, Electric Machine Control interface P2 level is dragged down, thereby the current channel that electric current forms through three road metal-oxide-semiconductors and current-limiting resistance R17 flow back to battery ground, P4 forms complete current circuit, makes machine operation.
When Electric Machine Control pwm signal InputA-is low level, between the C utmost point of triode Q12, the E utmost point, end, the 2nd pin level of control chip IC1 becomes high level and level voltage higher than the 3rd pin voltage of control chip IC1, and the 1st pin output control signal OutPutA of control chip IC1 is low level.Low level control signal OutPutA enables through one the B utmost point that resistance R 15 acts on triode Q10 and triode Q11 afterwards, between the C utmost point of conducting between the C utmost point of control triode Q11, the E utmost point, Q10, the E utmost point, ends, and drives signal DrivM1-output low level.Low level drives signal DrivM1-to be loaded in power amplifying part circuit.Drive signal DrivM1-to act on the other end of resistance R 1, the other end of the other end of resistance R 2, resistance R 3 is controlled between the metal-oxide-semiconductor D utmost point, the S utmost point of 3 tunnel parallel connections ends simultaneously, Electric Machine Control interface P2 level becomes high level, and motor quits work.Diode D3 plays the effect of absorbed power drive current body capacitance here.Diode D8 receives between the positive pole of low-voltage dc voltage and the control end of motor, plays and absorbs motor by starting to the effect that stops inverse electromotive force constantly.The rapid G electrode current that discharges metal-oxide-semiconductor Q1, Q2, Q3 when diode D4, D5, D10 are low level at driving signal DrivM1-, drags down G pole tension fast, makes metal-oxide-semiconductor Q1, Q2, Q3 become cut-off state from conducting state before.
When in circuit, electric current is excessive, the 5th pin voltage of control chip IC1 is lower than the 6th pin voltage of control chip IC1, the 7th pin output low level of control chip IC1.Because the 7th pin of control chip IC1 and the 3rd pin of control chip IC1 are connected, so the 3rd pin of control chip IC1 is also low level.Now no matter Electric Machine Control pwm signal InputA-is high level or low level, and the 1st pin output control signal OutPutA of control chip IC1 is low level, that is to say the generation of the 1st pin output pwm control signal that has stoped control chip IC1.Triode Q10 is always in off state, and triode Q11 is in conducting state, and drive signal DrivM1-is low level always.Low level drives signal DrivM1-to be loaded in power amplifying part circuit, makes metal-oxide-semiconductor Q1, Q2, Q3 all in off state, and motor quits work.Along with motor quits work, the total current flowing through in circuit also slowly diminishes.Once after flowing through the electric current recovery normal value of current-limiting resistance R17, the 5th pin voltage of control chip IC1 is higher than the 6th pin voltage of control chip IC1, the 7th pin of control chip IC1 is exported high level, and the 3rd pin of control chip IC1 is also high level.Along with the level variation of Electric Machine Control pwm signal InputA-, the 1st pin of control chip IC1 is exported corresponding pwm control signal OutPutA, and circuit recovers again normal operating conditions.
Above-described execution mode of the present utility model, does not form the restriction to the utility model protection range.Any modification of having done within spiritual principles of the present utility model, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.
Claims (2)
1. with a low-pressure high-power DC motor control circuit for overcurrent protection, comprise external dc power, it is characterized in that, comprise current foldback circuit (1) and with its connection control signal amplifying circuit (2) and power amplification circuit (3);
Described current foldback circuit (1) comprises control chip IC1, resistance R 5-R10, resistance R 16-R18, resistance R 26, resistance R 28, triode Q12 and capacitor C 1, capacitor C 2;
Described control signal amplifying circuit (2) comprises triode Q10, Q11 and resistance R 15, R21;
Described power amplification circuit (3) comprises sustained diode 3, D4, D5, D8, D10, metal-oxide-semiconductor Q1-Q3 and Electric Machine Control interface P2;
One end of the first pin OutPutA connecting resistance R5 of described control chip IC1, also connects digitally by resistance R 6; One end of the 2nd pin InPutA-connecting resistance R10 of control chip IC1, also connects the collector electrode of triode Q12 by resistance R 26, the emitter of triode Q12 connects digitally; One end of the 3rd pin InPutA+ connecting resistance R9 of control chip IC1, also meets the 7th pin OutPutB of control chip IC1; The 4th pin GND of control chip IC1 connects digitally; The 5th pin InPutB+ of control chip IC1, by one end of resistance R 7 connecting resistance R28, also connects one end of one end of capacitor C 1, one end of capacitor C 2 and resistance R 18; The 6th pin InPutB-of control chip IC1 meets the 7th pin OutPutB of control chip IC1 by resistance R 16; The other end, the other end of resistance R 5, the other end of the other end of resistance R 9 and resistance R 10 of the 8th pin VCC connecting resistance R28 of control chip IC1; The 8th pin VCC of control chip IC1 also connects external dc power;
The 6th pin InPutB-of the other end of capacitor C 1, C2 and control chip IC1 connects digitally, and the other end of capacitor C 1 also connects digitally by resistance R 17; Another termination external dc power ground of resistance R 18 connects digitally simultaneously; The base stage of triode Q12 meets the 2nd pin InPutA-of control chip IC1 by resistance R 8;
The first pin OutPutA of control chip IC1 connects the base stage of triode Q10 and the base stage of triode Q11 by resistance R 15; The collector electrode of triode Q10 connects external dc power, and the emitter of triode Q10 connects the emitter of triode Q11, and the collector electrode of triode Q11 connects digitally, and the emitter of triode Q10 also connects digitally by R21;
The 1st pin of sustained diode 8 connects the 2nd pin of external dc power and sustained diode 8, the 3rd pin of sustained diode 8 meets K end, the D utmost point of metal-oxide-semiconductor Q1, the D utmost point of the D utmost point of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and the Electric Machine Control interface P2 of fly-wheel diode D3, and the A termination of sustained diode 3 digitally; The S utmost point of metal-oxide-semiconductor Q1 connects digitally, and the G utmost point of metal-oxide-semiconductor Q1 connects the A end of fly-wheel diode D4 and one end of resistance R 1; The S utmost point of metal-oxide-semiconductor Q2 connects digitally, and the G utmost point of metal-oxide-semiconductor Q2 connects the A end of fly-wheel diode D5 and one end of resistance R 2; The S utmost point of metal-oxide-semiconductor Q3 connects digitally, and the G utmost point of metal-oxide-semiconductor Q3 connects the A end of fly-wheel diode D10 and enables one end of resistance R 3; The K end of the K termination sustained diode 10 of sustained diode 4, the K end of sustained diode 5, the other end of resistance R 1 are, the other end of the other end of resistance R 2 and resistance R 3; The emitter of another termination triode Q10 of resistance R 2.
2. according to claim 1 with the low-pressure high-power DC motor control circuit of overcurrent protection; it is characterized in that; described resistance R 28, R7, R5, R9, R10 are pull-up resistor; resistance R 18, R16, R6, R21 are divider resistance; resistance R 17 is current-limiting resistance; resistance R 15, R1, R2, R3, R8, R26 are for enabling resistance, and capacitor C 1, C2 are filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420207598.7U CN203788206U (en) | 2014-04-25 | 2014-04-25 | Low-voltage large-power direct current motor control circuit with over-current protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420207598.7U CN203788206U (en) | 2014-04-25 | 2014-04-25 | Low-voltage large-power direct current motor control circuit with over-current protection |
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| Publication Number | Publication Date |
|---|---|
| CN203788206U true CN203788206U (en) | 2014-08-20 |
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|---|---|---|---|
| CN201420207598.7U Expired - Lifetime CN203788206U (en) | 2014-04-25 | 2014-04-25 | Low-voltage large-power direct current motor control circuit with over-current protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956946A (en) * | 2014-04-25 | 2014-07-30 | 广东瑞德智能科技股份有限公司 | Low-voltage high-power direct-current motor control circuit with overcurrent protection function |
-
2014
- 2014-04-25 CN CN201420207598.7U patent/CN203788206U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956946A (en) * | 2014-04-25 | 2014-07-30 | 广东瑞德智能科技股份有限公司 | Low-voltage high-power direct-current motor control circuit with overcurrent protection function |
| CN103956946B (en) * | 2014-04-25 | 2016-12-07 | 广东瑞德智能科技股份有限公司 | A kind of low-pressure high-power DC motor control circuit of band overcurrent protection |
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