CN201750379U - Starting protection circuit of low-voltage and high-power motor - Google Patents
Starting protection circuit of low-voltage and high-power motor Download PDFInfo
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- CN201750379U CN201750379U CN2010202881114U CN201020288111U CN201750379U CN 201750379 U CN201750379 U CN 201750379U CN 2010202881114 U CN2010202881114 U CN 2010202881114U CN 201020288111 U CN201020288111 U CN 201020288111U CN 201750379 U CN201750379 U CN 201750379U
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- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model discloses a starting protection circuit of a low-voltage and high-power motor, which includes a micro-processing unit, a starting resistance control unit, a motor drive unit and a current detection unit, wherein the starting resistance control unit is used for limiting the starting current of a motor, the micro-processing unit is connected with the motor through the motor drive unit, the rotating speed of the motor is controlled by adjusting the duty cycle input by the motor drive unit, and the micro-processing unit controls the maximum current of the circuit of the motor according to the detection signals of the current detection unit; and the utility model discloses the protection circuit, which combines the advantages of soft starting and series resistance starting, responses swiftly and has strong reliability.
Description
Technical field
The utility model belongs to the circuit design technique field, relates in particular to a kind of startup protective circuit of low-pressure high-power motor.
Background technology
The low-pressure high-power motor when starting, adopt the low pressure grade, once just very big by electric current, adopt soft start or crosstalk resistance to start two kinds of safeguard measures usually for this kind motor at present.Because the electric current during the low-pressure high-power electric motor starting is big, can on resistance, produce thermal losses the controller local temperature is raise fast, the power resistor volume is too huge simultaneously; During starter motor, the PWM duty cycle adjustment is unsuitable too fast under low-voltage, big electric current, high-power situation.Adopt present safeguard measure; be that soft start or crosstalk resistance starts the multinomial protection tasks such as rapidity, thermal losses and overtemperature protection that all can not take into account electric motor starting simultaneously; thereby be necessary to propose a kind of more efficiently protective circuit, the multinomial protection task in the time that the low-pressure high-power electric motor starting can being taken into account simultaneously.
Summary of the invention
Problem to be solved in the utility model just provides a kind of startup protective circuit of low-pressure high-power motor, and the advantage in conjunction with soft start and crosstalk resistance is opened is swift in response, good reliability.
For solving the problems of the technologies described above; the utility model adopts following technical scheme: a kind of startup protective circuit of low-pressure high-power motor; it is characterized in that: comprise microprocessing unit; the starting resistance control unit; electric-motor drive unit and current detecting unit; described starting resistance control unit is used to limit the starting current of motor; described microprocessing unit connects motor by electric-motor drive unit; and by regulating the duty ratio control motor speed of electric-motor drive unit input, described microprocessing unit is according to the maximum current of the detection signal control motor circuit of current detecting unit.
Further, described electric-motor drive unit comprises PWM drive signal unit and drive circuit.
Further, described starting resistance control unit comprises power resistor, is connected in parallel on the power tube on the power resistor, described microprocessing unit is by the conducting of power supply unit driving power pipe, under the power tube off state, power resistor inserts motor circuit, under the power tube conducting state, power resistor is by short circuit.
Further, described power supply unit is made of two triodes.
Further, described power resistor is connected on the positive terminal of motor power.
Further, described power tube adopts NMOS power tube IRFB3207.
Further, described microprocessing unit is the chip MAX5028 that boosts.
The beneficial effects of the utility model: employing crosstalk resistance starts back reliability height, reaction speed is fast; while is in conjunction with the advantage of soft start; the power resistor resistance can reduce one times; regulate the method that combines by the serial connection power resistor with motor power PWM; make the electric motor starting process be in big electric current always and, not only protected motor but also make the electric motor starting performance promote greatly again less than the state of motor limiting current.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 is an operation principle block diagram of the present utility model;
Fig. 2 is a circuit element connection diagram of the present utility model.
Embodiment
As shown in Figure 1 and Figure 2; the utility model is a kind of startup protective circuit of low-pressure high-power motor; comprise microprocessing unit 1, starting resistance control unit 4, electric-motor drive unit and current detecting unit 6; described starting resistance control unit 4 is used to limit the starting current of motor 5; described microprocessing unit 1 connects motor 5 by electric-motor drive unit; and by regulating duty ratio control motor 5 rotating speeds of electric-motor drive unit input, described microprocessing unit 1 is according to the maximum current of the detection signal control motor circuit of current detecting unit 6.
Electric-motor drive unit comprises PWM drive signal unit 2 and drive circuit 3; Starting resistance control unit 4 comprises power resistor R, is connected in parallel on the power tube Q2 on the power resistor R, described microprocessing unit 1 is by power supply unit driving power pipe Q2 conducting, when power tube Q2 turn-offs, power resistor R inserts the motor circuit limiting starting current, power tube Q2 conducting when motor 5 rotating speeds reach certain numerical value, power resistor R is by short circuit, power tube Q2 adopts NMOS power tube IRFB3207, the conducting internal resistance is less than 10 milliohms, conduction voltage drop mainly falls on motor coil voltage much smaller than general relay.Power supply unit is made of two triode Q1; The resistance of power resistor R and power should be selected according to the limiting current of motor coil, can guarantee that motor speed is zero and the PWM duty ratio is that 50% o'clock motor is under the safe current condition; Because the dividing potential drop of power resistor R is very big under current state, in order to guarantee bridge MOSFET operate as normal on the motor circuit, power resistor R is connected on the positive terminal of motor 5 power supplys, microprocessing unit 1 adopts the chip MAX5028 that boosts, this chip that boosts provides 35V voltage to power to two triode Q1, with driving power pipe Q2 conducting.
During starter motor, be made as access power resistance R under 50% the condition in electric-motor drive unit PWM duty ratio; Along with the PWM duty ratio strengthens, motor speed improves, and current detecting unit 6 guarantees that simultaneously motor circuit works under safe current; When motor speed tended towards stability, the chip MAX5028 that boosts provided 35V voltage to power to two triode Q1, driving power pipe Q2 conducting, and power resistor R is by short circuit, and the PWM duty ratio of regulating electric-motor drive unit makes the motor stabilizing operation.Above-mentioned execution mode is wherein a kind of embodiment of the present utility model; protection range of the present utility model is not construed as limiting; those skilled in the art can make various changes and distortion according to schematic diagram shown in Fig. 1; only otherwise break away from spirit of the present utility model, all should belong to the defined scope of the utility model claims.
Claims (7)
1. the startup protective circuit of a low-pressure high-power motor; it is characterized in that: comprise microprocessing unit (1), starting resistance control unit (4), electric-motor drive unit and current detecting unit (6); described starting resistance control unit (4) is used to limit the starting current of motor (5); described microprocessing unit (1) connects motor (5) by electric-motor drive unit; and by regulating duty ratio control motor (5) rotating speed of electric-motor drive unit input, described microprocessing unit (1) is according to the maximum current of the detection signal control motor circuit of current detecting unit (6).
2. the startup protective circuit of a kind of low-pressure high-power motor according to claim 1 is characterized in that: described electric-motor drive unit comprises PWM drive signal unit (2) and drive circuit (3).
3. the startup protective circuit of a kind of low-pressure high-power motor according to claim 2; it is characterized in that: described starting resistance control unit (4) comprises power resistor (R), is connected in parallel on the power tube (Q2) on the power resistor (R); described microprocessing unit (1) is by power supply unit driving power pipe (Q2) conducting; under power tube (Q2) off state; power resistor (R) inserts motor circuit; under power tube (Q2) conducting state, power resistor (R) is by short circuit.
4. the startup protective circuit of a kind of low-pressure high-power motor according to claim 3 is characterized in that: described power supply unit is made of two triodes (Q1).
5. the startup protective circuit of a kind of low-pressure high-power motor according to claim 3 is characterized in that: described power resistor (R) is connected on the positive terminal of motor power.
6. according to the startup protective circuit of claim 3 or 5 described a kind of low-pressure high-power motors, it is characterized in that: described power tube (Q2) adopts NMOS power tube IRFB3207.
7. according to the startup protective circuit of claim 1 or 2 or 3 described a kind of low-pressure high-power motors, it is characterized in that: described microprocessing unit (1) is the chip MAX5028 that boosts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202881114U CN201750379U (en) | 2010-08-06 | 2010-08-06 | Starting protection circuit of low-voltage and high-power motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202881114U CN201750379U (en) | 2010-08-06 | 2010-08-06 | Starting protection circuit of low-voltage and high-power motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201750379U true CN201750379U (en) | 2011-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202881114U Expired - Fee Related CN201750379U (en) | 2010-08-06 | 2010-08-06 | Starting protection circuit of low-voltage and high-power motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201750379U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997301A (en) * | 2010-08-06 | 2011-03-30 | 许晓华 | Start protecting circuit of low-voltage and high-power motor |
-
2010
- 2010-08-06 CN CN2010202881114U patent/CN201750379U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997301A (en) * | 2010-08-06 | 2011-03-30 | 许晓华 | Start protecting circuit of low-voltage and high-power motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHEJIANG LINIX MOTOR CO., LTD. Free format text: FORMER OWNER: XU XIAOHUA Effective date: 20130107 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 322100 JINHUA, ZHEJIANG PROVINCE TO: 322118 JINHUA, ZHEJIANG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130107 Address after: 196 No. 322118 Zhejiang city of Dongyang province Hengdian Electronic Industrial Park Industrial Avenue Patentee after: Zhejiang Linix Motor Co., Ltd. Address before: 196 No. 322100 Zhejiang city of Dongyang province Hengdian Electronic Industrial Park Industrial Avenue Patentee before: Xu Xiaohua |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20140806 |
|
| EXPY | Termination of patent right or utility model |