CN201965144U - Speed measuring device of small motor - Google Patents
Speed measuring device of small motor Download PDFInfo
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- CN201965144U CN201965144U CN2010206775947U CN201020677594U CN201965144U CN 201965144 U CN201965144 U CN 201965144U CN 2010206775947 U CN2010206775947 U CN 2010206775947U CN 201020677594 U CN201020677594 U CN 201020677594U CN 201965144 U CN201965144 U CN 201965144U
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Abstract
The utility model relates to a speed measuring device of a small motor, which is characterized by comprising a motor commutation ripple signal sampling circuit (1) connected with a motor signal output end, a signal filter amplifying circuit (2) with a signal input end being connected with the signal output end of the motor commutation ripple signal sampling circuit, a wave-shaped rectifying circuit (3) with a signal input end being connected with the signal output end of the signal filter amplifying circuit, and a rectification square wave amplifying circuit (4) with a signal input end being connected with the signal output end of the wave-shaped rectifying circuit. Compared with the prior art, the speed measuring device of the small motor has the advantages that: the speed measuring device does not need any speed measuring sensor or other speed measuring devices in the prior art at all but directly measures the rotating speed of a motor by sampling ripple signals when the motor commutates, so that the cost is greatly reduced, and the speed measuring device of the small motor has the advantages of space saving, convenience in installation, high measuring precision and the like.
Description
Technical field
The utility model relates to a kind of speed measuring device of micro-machine.
Background technology
Have the brush direct current generator cheap, control and speed governing are simple, are widely used.And rotating speed is the important indicator that the brush direct current generator is arranged, and its unit is: rev/min.In many application scenarios, all need rotating speed of motor is measured accurately, existing have the speed measuring device of brush direct current generator that scrambler, tech-generator, photoelectric code disk, laser Dppler veloicty measurement or the like are arranged, but it is very high that the shortcoming of these speed-measuring methods is installation costs, and almost the price with motor is suitable; And these devices need be installed with motor, handle for rate signal being passed to central microprocessor, must take some corresponding technical measures to increase the reliability of transmission, promptly take up room and the inconvenience installation.
The utility model content
Technical problem to be solved in the utility model be provide a kind of at above-mentioned prior art and do not need to adopt speed measuring device of the prior art, can save the space, the speed measuring device of easy for installation, micro-machine that measuring accuracy is high.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: this motor commutation ripple signal sample circuit, link to each other with the motor signal output part, and be used to gather motor commutation ripple signal, and the ripple conversion of signals that should commutate becomes voltage signal;
The signal filtering amplifying circuit, its signal input part links to each other with the signal output part of described motor commutation ripple signal sample circuit, be used for filtering motor commutation ripple signal and do not comprise the DC component of motor speed information, and the motor commutation ripple signal that filtering is not comprised after the DC component of motor speed information amplifies;
Waveform shaping circuit, its signal input part links to each other with the signal output part of described signal filtering amplifying circuit, is used for the motor commutation ripple conversion of signals after handling through described signal filtering amplifying circuit is become the square-wave signal that can be discerned by microprocessor;
Shaping square wave amplifying circuit, its signal input part links to each other with the signal output part of described waveform shaping circuit, and the square-wave signal that is used for obtaining after handling through described waveform shaping circuit amplifies so that can allow the microprocessor better recognition.
For the brush direct current generator is arranged, one of its indispensable ingredient be exactly commutator, when motor rotates, rotor all obtains the electric current of proper orientation by commutator, to guarantee the continuous rotation of motor, and commutation each time, electric current in the rotor all can reduce through one, zero, the reverse process that increases, and rotor has certain inductance characteristic, when moment of commutation or brush touching are between two adjacent commutator segments, the commutator two ends have high voltage and produce, this voltage is reflected on the current of electric a little fluctuation can occur, the ripple that this fluctuation produces is called the commutation ripple, and has the each commutation of brush direct current generator all can have this ripple to occur, and its waveform of commutation ripple signal at motor two ends is the M type ripple of amplitude 50mv rule; And the frequency of the direct waveform therewith of rotating speed of motor is proportional, so we can measure rotating speed of motor by surveying the commutation ripple, it is feasible therefore adopting scheme of the present utility model to carry out testing the speed of micro-machine.
As improvement, described signal filtering amplifying circuit can be realized in the following way: it comprises a filter capacitor, first resistance, second resistance, the 3rd resistance, a concussion electric capacity and an operational amplifier, the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of first resistance by behind the described filter capacitor, second end of described first resistance links to each other with the inverting input of operational amplifier, an end ground connection behind the composition RC circuit after described second resistance and the described concussion capacitances in series, the other end links to each other with the in-phase input end of described operational amplifier, the two ends of described the 3rd resistance are connected to the inverting input and the output terminal of described operational amplifier, and the output terminal of described operational amplifier is the signal output part of described signal filtering amplifying circuit.
Described signal filtering amplifying circuit can also be realized by the another one scheme: it comprises a filter capacitor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, second electric capacity, the 3rd electric capacity and an operational amplifier, the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of the 4th resistance by behind the described filter capacitor, second end of described the 4th resistance links to each other with the inverting input of operational amplifier, the first end connection-5V stabilized voltage supply of described the 5th resistance, second end of described the 5th resistance links to each other with the in-phase input end of described operational amplifier; The equal ground connection of first end of described the 6th resistance, second electric capacity, the 3rd electric capacity, second end of described the 6th resistance, second electric capacity, the 3rd electric capacity all links to each other with the in-phase input end of described operational amplifier; The two ends of described the 7th resistance are connected to the inverting input and the output terminal of described operational amplifier, and the output terminal of described operational amplifier is the signal output part of described signal filtering amplifying circuit.
Described motor commutation ripple signal sample circuit comprises a sampling resistor, first end of this sampling resistor links to each other with the motor signal output part, the second end ground connection of this sampling resistor, and first end of described sampling resistor is the signal output part of this motor commutation ripple signal sample circuit.
Described waveform shaping circuit comprises the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the 12 resistance and an operational amplifier, the signal output part of wherein said signal filtering amplifying circuit links to each other with the inverting input of described operational amplifier, first end of described the 8th resistance links to each other with+5V voltage of voltage regulation, second end of described the 8th resistance links to each other with first end of described the tenth resistance, and second end of described the tenth resistance links to each other with the in-phase input end of described operational amplifier; The first end ground connection of the 9th resistance, second end of the 9th resistance links to each other with first end of described the tenth resistance; First end of the 11 resistance links to each other with the output terminal of described operational amplifier, the two ends of described the 12 resistance are connected on second end of the in-phase input end of operational amplifier and the 11 resistance, and second end of described the 12 resistance is the signal output part of described waveform shaping circuit.
Described shaping square wave amplifying circuit comprises the 13 resistance, the 14 resistance and a triode, the signal output part of wherein said waveform shaping circuit links to each other with the base stage of described triode by the 13 resistance, the collector of described triode connects connection+5V stabilized voltage supply behind the 14 resistance, the grounded emitter of triode.
Compared with prior art, advantage of the present utility model is: speed measuring device of the present utility model does not need tachogenerator of the prior art or other speed measuring devices fully, but the ripple signal during directly by the sampling motor commutation is measured rotating speed of motor, cost just greatly reduces like this, and has the space of saving, easy for installation, measuring accuracy advantages of higher.
Description of drawings
Fig. 1 is the circuit structure block diagram of the speed measuring device of the utility model embodiment micro-machine;
Fig. 2 is the circuit structure diagram of motor commutation ripple signal sample circuit among the utility model embodiment;
Fig. 3 is the circuit structure diagram of signal filtering amplifying circuit scheme one among the utility model embodiment;
Fig. 4 is the circuit structure diagram of signal filtering amplifying circuit scheme two among the utility model embodiment;
Fig. 5 is the circuit structure diagram of waveform shaping circuit among the utility model embodiment;
Fig. 6 is the circuit structure diagram of shaping square wave amplifying circuit among the utility model embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
The speed measuring device of micro-machine as shown in Figure 1, it comprises
Motor commutation ripple signal sample circuit 1 links to each other with the motor signal output part, is used to gather motor commutation ripple signal, and the ripple conversion of signals that should commutate becomes voltage signal;
Signal filtering amplifying circuit 2, its signal input part links to each other with the signal output part of described motor commutation ripple signal sample circuit, be used for filtering motor commutation ripple signal and do not comprise the DC component of motor speed information, and the motor commutation ripple signal that filtering is not comprised after the DC component of motor speed information amplifies;
Waveform shaping circuit 3, its signal input part links to each other with the signal output part of described signal filtering amplifying circuit, is used for the motor commutation ripple conversion of signals after handling through described signal filtering amplifying circuit is become the square-wave signal that can be discerned by microprocessor;
Shaping square wave amplifying circuit 4, its signal input part links to each other with the signal output part of described waveform shaping circuit, and the square-wave signal that is used for obtaining after handling through described waveform shaping circuit amplifies so that can allow the microprocessor better recognition.
Because the ripple signal that occurs during motor commutation is to be superimposed upon on the output current of motor, and central microprocessor can only be discerned voltage signal, so, in the present embodiment, motor commutation ripple signal sample circuit 1 converts current signal to voltage signal by the sampling resistor R of a 0.01ohm/5W, first end of this sampling resistor R links to each other with the motor signal output part, the second end ground connection of this sampling resistor R, and first end of described sampling resistor R is the signal output part of this motor commutation ripple signal sample circuit, the signal end of this signal conversion voltage from Fig. 2 takes out, and sends into follow-up amplifying circuit then and carries out processing and amplifying.
Be superimposed with the direct current signal that does not much comprise motor speed information in the commutation ripple signal by the 1 conversion output of motor commutation ripple signal sample circuit, the DC component of these stacks must be with its filtering before the ripple signal is amplified, not so will certainly have influence on the accuracy of measurement, and want these DC component of filtering, circuit in the present embodiment scheme one adopts one 104 nonpolarity filter capacitor, referring to C1 among Fig. 3, because electric capacity has the characteristic of handing over every straight-through, and commutation ripple signal is a M type alternating signal, so, just well remained by commutation ripple signal behind the C1, and unwanted direct current signal is just by the electric capacity filtering, and the commutation ripple is the feeble signal of a millivolt level, and its amplitude is approximately about 50mv, this signal is not as amplifying, and microprocessor can't be discerned; Can be discerned by microprocessor in order to make signal, we must design a kind of small signal amplification circuit feeble signal is amplified, therefore in the present embodiment scheme one, the signal filtering amplifying circuit comprises a filter capacitor C1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, a concussion capacitor C 2 and a model are the operational amplifier U3A of LM358, the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of first resistance R 1 after by described filter capacitor C1, second end of described first resistance R 1 links to each other with the inverting input of operational amplifier U3A, an end ground connection behind described second resistance R 2 and the described concussion capacitor C 2 series connection back composition RC circuit, the other end links to each other with the in-phase input end of described operational amplifier U3A, the two ends of described the 3rd resistance R 3 are connected to inverting input and the output terminal of described operational amplifier U3A, and the output terminal of described operational amplifier U3A is the signal output part of described signal filtering amplifying circuit.Be under the desirable running status at operational amplifier U3A, the alternating signal after the output terminal of amplifier will be exported amplification, its amplification coefficient are among Fig. 3, the ratio of the 3rd resistance R 3 and first resistance R 1.
Fig. 4 has provided the circuit of signal filtering amplifying circuit scheme two, it comprises a filter capacitor C1, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, second capacitor C 2, the 3rd capacitor C 3 and a model are the operational amplifier U1A of LM358, the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of the 4th resistance R 4 after by described filter capacitor C1, second end of described the 4th resistance R 4 links to each other with the inverting input of operational amplifier U1A, the first end connection-5V stabilized voltage supply of described the 5th resistance R 5, second end of described the 5th resistance R 5 links to each other with the in-phase input end of described operational amplifier U3A; The equal ground connection of first end of described the 6th resistance R 6, second capacitor C 2, the 3rd capacitor C 3, second end of described the 6th resistance R 6, second capacitor C 2, the 3rd capacitor C 3 all links to each other with the in-phase input end of described operational amplifier U3A; The two ends of described the 7th resistance R 7 are connected to inverting input and the output terminal of described operational amplifier U3A, and the output terminal of described operational amplifier U1A is the signal output part of described signal filtering amplifying circuit.Commutation ripple signal acts on the inverting input of operational amplifier U1A by the 4th resistance R 4, so, signal_1 is opposite with input voltage phase for operational amplifier U1A output voltage, and the 7th resistance R 7 is connected across the output terminal and the inverting input of integrated transporting discharging, introduces voltage negative feedback in parallel; It amplifies shown in voltage and the following formula of input voltage relation: U
o=(R7/R4) U
i, U wherein
oFor amplify the back output voltage ,-R7/R4 is amplification coefficient, U
iBe input voltage; Since commutation ripple signal by the end of oppisite phase input of operational amplifier U1A its phase place for just, cause output signal voltage must be negative pressure, and this circuit does not provide negative voltage, in order to solve the problem that negative voltage appears in circuit, we are in the certain improvement of in-phase end input having carried out of amplifier, convert to from original in-phase end ground connection and to connect the 2.5V reference voltage, so just with the reference ground of 2.5V as this amplifying circuit, be called for short virtual earth, by raising virtual earth, well solved the problem of circuit output negative pressure.
Because the waveform after the signal filtering amplifying circuit amplifies still is the M type ripple of alternation, this waveform can not be discerned by microprocessor, so, we must design a waveform shaping circuit, with the identical square wave of this waveform transformation Cheng Yuqi frequency, so just solved the problem that microprocessor can't be discerned.Waveform shaping circuit in the present embodiment comprises the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R 12 and an operational amplifier U1B, the signal output part of wherein said signal filtering amplifying circuit links to each other with the inverting input of described operational amplifier (U1B), first end of described the 8th resistance R 8 links to each other with+5V voltage of voltage regulation, second end of described the 8th resistance R 8 links to each other with first end of described the tenth resistance R 10, and second end of described the tenth resistance (R10) links to each other with the in-phase input end of described operational amplifier U1B; The first end ground connection of the 9th resistance R 9, second end of the 9th resistance R 9 links to each other with first end of described the tenth resistance R 10; First end of the 11 resistance R 11 links to each other with the output terminal of described operational amplifier U1B, the two ends of described the 12 resistance R 12 are connected on second end of the in-phase input end of operational amplifier U1B and the 11 resistance R 11, and second end of described the 12 resistance R 12 is the signal output part of described waveform shaping circuit.
Because the square wave that the waveform shaping circuit shaping of prime is come out is owing to be subjected to the influence of amplifier oneself factor, the high level voltage of square wave has only 3.8V, rather than the 5V voltage of standard, in order to allow the microprocessor better recognition, just designed shaping square wave amplifying circuit in the present embodiment.This shaping square wave amplifying circuit comprises the 13 resistance R the 13, the 14 resistance R 14 and a triode Q1, the signal output part of wherein said waveform shaping circuit links to each other with the base stage of described triode Q1 by the 13 resistance R 13, the collector of described triode Q1 connects the 14 resistance R 14 back connection+5V stabilized voltage supplys, the grounded emitter of triode Q1.Its principle mainly is the triode formation on-off circuit by 9013 (NPN), referring to shown in Figure 6, when signal_2 end input low level, triode Q1 by, at this moment, signal_o end output 5V high level, otherwise, the 0V low level is then exported in the triode conducting, and the waveform of exporting by this circuit is exactly fairly regular 0V or the square wave of 5V.The collector of described triode Q1 is the signal output part of described shaping square wave amplifying circuit, links to each other with external little processing, and the microprocessor here can be the central processing unit of motor.
Claims (6)
1. the speed measuring device of a micro-machine is characterized in that: comprise
Motor commutation ripple signal sample circuit (1) links to each other with the motor signal output part, is used to gather motor commutation ripple signal, and the ripple conversion of signals that should commutate becomes voltage signal;
Signal filtering amplifying circuit (2), its signal input part links to each other with the signal output part of described motor commutation ripple signal sample circuit, be used for filtering motor commutation ripple signal and do not comprise the DC component of motor speed information, and the motor commutation ripple signal that filtering is not comprised after the DC component of motor speed information amplifies;
Waveform shaping circuit (3), its signal input part links to each other with the signal output part of described signal filtering amplifying circuit, is used for the motor commutation ripple conversion of signals after handling through described signal filtering amplifying circuit is become the square-wave signal that can be discerned by microprocessor;
Shaping square wave amplifying circuit (4), its signal input part links to each other with the signal output part of described waveform shaping circuit, and the square-wave signal that is used for obtaining after handling through described waveform shaping circuit amplifies so that can allow the microprocessor better recognition.
2. the speed measuring device of micro-machine according to claim 1, it is characterized in that: described signal filtering amplifying circuit comprises a filter capacitor (C1), first resistance (R1), second resistance (R2), the 3rd resistance (R3), a concussion electric capacity (C2) and an operational amplifier (U3A), the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of first resistance (R1) by described filter capacitor (C1) back, second end of described first resistance (R1) links to each other with the inverting input of operational amplifier (U3A), an end ground connection behind described second resistance (R2) and described concussion electric capacity (C2) the series connection back composition RC circuit, the other end links to each other with the in-phase input end of described operational amplifier (U3A), the two ends of described the 3rd resistance (R3) are connected to the inverting input and the output terminal of described operational amplifier (U3A), and the output terminal of described operational amplifier (U3A) is the signal output part of described signal filtering amplifying circuit.
3. the speed measuring device of micro-machine according to claim 1, it is characterized in that: described signal filtering amplifying circuit comprises a filter capacitor (C1), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), second electric capacity (C2), the 3rd electric capacity (C3) and an operational amplifier (U1A), the signal output part of wherein said motor commutation ripple signal sample circuit links to each other with first end of the 4th resistance (R4) by described filter capacitor (C1) back, second end of described the 4th resistance (R4) links to each other with the inverting input of operational amplifier (U1A), the first end connection-5V stabilized voltage supply of described the 5th resistance (R5), second end of described the 5th resistance (R5) links to each other with the in-phase input end of described operational amplifier (U3A); The equal ground connection of first end of described the 6th resistance (R6), second electric capacity (C2), the 3rd electric capacity (C3), second end of described the 6th resistance (R6), second electric capacity (C2), the 3rd electric capacity (C3) all link to each other with the in-phase input end of described operational amplifier (U3A); The two ends of described the 7th resistance (R7) are connected to the inverting input and the output terminal of described operational amplifier (U3A), and the output terminal of described operational amplifier (U1A) is the signal output part of described signal filtering amplifying circuit.
4. the speed measuring device of micro-machine according to claim 1, it is characterized in that: described motor commutation ripple signal sample circuit comprises a sampling resistor (R), first end of this sampling resistor (R) links to each other with the motor signal output part, the second end ground connection of this sampling resistor (R), and first end of described sampling resistor (R) is the signal output part of this motor commutation ripple signal sample circuit.
5. the speed measuring device of micro-machine according to claim 1, it is characterized in that: described waveform shaping circuit comprises the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12) and an operational amplifier (U1B), the signal output part of wherein said signal filtering amplifying circuit links to each other with the inverting input of described operational amplifier (U1B), first end of described the 8th resistance (R8) links to each other with+5V voltage of voltage regulation, second end of described the 8th resistance (R8) links to each other with first end of described the tenth resistance (R10), and second end of described the tenth resistance (R10) links to each other with the in-phase input end of described operational amplifier (U1B); The first end ground connection of the 9th resistance (R9), second end of the 9th resistance (R9) links to each other with first end of described the tenth resistance (R10); First end of the 11 resistance (R11) links to each other with the output terminal of described operational amplifier (U1B), the two ends of described the 12 resistance (R12) are connected on second end of the in-phase input end of operational amplifier (U1B) and the 11 resistance (R11), and second end of described the 12 resistance (R12) is the signal output part of described waveform shaping circuit.
6. the speed measuring device of micro-machine according to claim 1, it is characterized in that: described shaping square wave amplifying circuit comprises the 13 resistance (R13), the 14 resistance (R14) and a triode (Q1), the signal output part of wherein said waveform shaping circuit links to each other with the base stage of described triode (Q1) by the 13 resistance (R13), the collector of described triode (Q1) connects the 14 resistance (R14) back connection+5V stabilized voltage supply, the grounded emitter of triode (Q1), the collector of described triode (Q1) is the signal output part of described shaping square wave amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206775947U CN201965144U (en) | 2010-12-13 | 2010-12-13 | Speed measuring device of small motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206775947U CN201965144U (en) | 2010-12-13 | 2010-12-13 | Speed measuring device of small motor |
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| CN201965144U true CN201965144U (en) | 2011-09-07 |
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| CN2010206775947U Expired - Fee Related CN201965144U (en) | 2010-12-13 | 2010-12-13 | Speed measuring device of small motor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675906A (en) * | 2016-03-08 | 2016-06-15 | 江苏仁源电气有限公司 | Direct current brushed motor speed measurement device and speed measurement method |
| CN105751004A (en) * | 2016-02-19 | 2016-07-13 | 西安秦川数控系统工程有限公司 | Post-processing circuit for position feedback signals |
| CN107152906A (en) * | 2017-05-04 | 2017-09-12 | 唐山钢铁集团微尔自动化有限公司 | A kind of potable metal thickness gauge |
| CN110275043A (en) * | 2019-06-21 | 2019-09-24 | 拉扎斯网络科技（上海）有限公司 | DC motor speed detection method, device, storage medium and electronic equipment |
| CN111060732A (en) * | 2019-12-24 | 2020-04-24 | 兰州飞行控制有限责任公司 | Signal processing circuit based on DSP gathers motor current |
| CN111608503A (en) * | 2019-02-26 | 2020-09-01 | 麦格纳覆盖件有限公司 | Smart latch assembly with window regulator control |
| CN111740657A (en) * | 2019-03-20 | 2020-10-02 | 浙江润诚智控科技有限公司 | Control device and electric equipment |
| CN113417533A (en) * | 2021-07-19 | 2021-09-21 | 温州长江汽车电子有限公司 | Ripple anti-pinch circuit of automobile electric window |
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2010
- 2010-12-13 CN CN2010206775947U patent/CN201965144U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105751004A (en) * | 2016-02-19 | 2016-07-13 | 西安秦川数控系统工程有限公司 | Post-processing circuit for position feedback signals |
| CN105675906A (en) * | 2016-03-08 | 2016-06-15 | 江苏仁源电气有限公司 | Direct current brushed motor speed measurement device and speed measurement method |
| CN107152906A (en) * | 2017-05-04 | 2017-09-12 | 唐山钢铁集团微尔自动化有限公司 | A kind of potable metal thickness gauge |
| CN111608503A (en) * | 2019-02-26 | 2020-09-01 | 麦格纳覆盖件有限公司 | Smart latch assembly with window regulator control |
| CN111608503B (en) * | 2019-02-26 | 2021-11-05 | 麦格纳覆盖件有限公司 | Smart latch assembly with window regulator control |
| CN111740657A (en) * | 2019-03-20 | 2020-10-02 | 浙江润诚智控科技有限公司 | Control device and electric equipment |
| CN110275043A (en) * | 2019-06-21 | 2019-09-24 | 拉扎斯网络科技（上海）有限公司 | DC motor speed detection method, device, storage medium and electronic equipment |
| CN111060732A (en) * | 2019-12-24 | 2020-04-24 | 兰州飞行控制有限责任公司 | Signal processing circuit based on DSP gathers motor current |
| CN113417533A (en) * | 2021-07-19 | 2021-09-21 | 温州长江汽车电子有限公司 | Ripple anti-pinch circuit of automobile electric window |
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Granted publication date: 20110907 Termination date: 20121213 |