CN204539035U - A kind of low EMI motor driver - Google Patents
A kind of low EMI motor driver Download PDFInfo
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- CN204539035U CN204539035U CN201520263619.1U CN201520263619U CN204539035U CN 204539035 U CN204539035 U CN 204539035U CN 201520263619 U CN201520263619 U CN 201520263619U CN 204539035 U CN204539035 U CN 204539035U
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Abstract
The utility model relates to motor driver technical field, be specially a kind of low EMI motor driver, comprise drive circuit, drive circuit comprises motor coil, be placed in the EMI transducer of motor driver by motor coil part, the output of the sensor circuit of EMI transducer is connected to the input of a time-domain and frequency-domain change-over circuit, the output of time-domain and frequency-domain change-over circuit is connected to the input of a subtraction circuit, the input of subtraction circuit is also connected with an output presetting spectrum circuits, the output of subtraction circuit is connected to the input of an integrating circuit, the output of integrating circuit is connected to the input of a frequency jitter circuit, the input of frequency jitter circuit is also connected with the output of a pwm circuit, the output of frequency jitter circuit is connected to the input of a H-bridge drive circuit, the output of H-bridge drive circuit is connected to the input of a H-bridge circuit, the output of H-bridge circuit is connected to motor coil, stable, power consumption less and endanger little.
Description
Technical field
the utility model relates to motor driver technical field, is specially a kind of low EMI motor driver.
Background technology
the driver of motor operationally can produce EMI(electromagnetic interference), certain harm is produced to the electronic equipment of surrounding and personnel, particularly motor unsteadiness at work, the EMI(electromagnetic interference that as easy as rolling off a log formation is superpower) and great damage is caused to equipment and personnel, all there is above-mentioned problem in existing motor driver, need a kind of operation more stable, the motor driver of lower EMI can be maintained.
Utility model content
an object of the present utility model is to provide a kind of stable, power consumption less and endanger little low EMI motor driver.
above-mentioned technical purpose of the present utility model is achieved by the following technical programs: a kind of low EMI motor driver, comprise drive circuit, drive circuit comprises motor coil, be placed in the EMI transducer of motor driver by motor coil part, the output of the sensor circuit of described EMI transducer is connected to the input of a time-domain and frequency-domain change-over circuit, the output of described time-domain and frequency-domain change-over circuit is connected to the input of a subtraction circuit, the input of described subtraction circuit is also connected with an output presetting spectrum circuits, the output of described subtraction circuit is connected to the input of an integrating circuit, the output of described integrating circuit is connected to the input of a frequency jitter circuit, the input of described frequency jitter circuit is also connected with the output of a pwm circuit, the output of described frequency jitter circuit is connected to the input of a H-bridge drive circuit, the output of described H-bridge drive circuit is connected to the input of a H-bridge circuit, the output of described H-bridge circuit is connected to motor coil, described H-bridge drive circuit is three-phase H-bridge drive circuit, described H-bridge circuit is three-phase H-bridge circuit, motor coil is three phase electric machine coil.
in technique scheme, the electromagnetic interference signal utilizing EMI transducer to detect also exports analog circuit signal to time-domain and frequency-domain change-over circuit by sensor circuit, then the frequency circuit signal preset of the frequency circuit signal of each frequency of time-domain and frequency-domain change-over circuit and default spectrum circuits is obtained a difference frequency circuit signal by subtraction circuit, output frequency control signal is amplified again by integrating circuit, control to come from PWM(pulse width modulation by the effect of frequency jitter circuit) signal of circuit, the operating frequency of pwm circuit is shaken, the frequency spectrum concentrated, by trembling, frequency division free combat is flat can maintain a comparatively stable state, tremble in the cycle frequently at one, the frequency control signal exported by integrating circuit controls the holding time length of each frequency, the circuit control signal of a H-bridge drive circuit is exported by frequency jitter circuit, H-bridge circuit work is driven again by H-bridge drive circuit, and motor coil is also worked, this circuit can make system comparatively fast to stablize, and the frequency self-energy that EMI is being concerned about that motor produces will be controlled in certain limit, reduce the spectral energy density that motor drives EMI, maintain a lower state, whole circuit is higher compared to traditional circuit stability, less energy consumption, heat radiation is few, preset the value that the predetermined frequency one of the frequency circuit signal of spectrum circuits is less, it is a value being similar to safer EMI, when the signal frequency difference of itself and time-domain and frequency-domain change-over circuit is larger positive, the time that the frequency extending this frequency by frequency jitter circuit stops, otherwise it is then contrary, in time equaling 0, it is made to keep the time of staying constant, play the function of this circuit so better, motor coil can adopt existing motor coil, EMI transducer can adopt existing transducer, time-domain and frequency-domain change-over circuit, subtraction circuit, preset spectrum circuits, integrating circuit, frequency jitter circuit, pwm circuit, frequency jitter circuit, H-bridge drive circuit, H-bridge circuit all can adopt existing circuit, by reasonably selecting the stability of the operation improving circuit further, reduce energy consumption, heat radiation is few, the spectral energy density that motor drives EMI can be reduced better, reduce the appearance of strong EMI.
as to preferably of the present utility model, H-bridge circuit comprises power end and earth terminal, three branch roads are parallel with between described power end and earth terminal, every bar branch road is all in series with two metal-oxide-semiconductor field effect transistors, be respectively the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the grid of each metal-oxide-semiconductor field effect transistor is connected with the exit point of H-bridge drive circuit output as the input endpoint of H-bridge circuit input, the source electrode of the first metal-oxide-semiconductor is connected with power end, the source electrode of the second metal-oxide-semiconductor is connected with earth terminal, the drain electrode of the first metal-oxide-semiconductor on same branch road is connected with the drain electrode of the second metal-oxide-semiconductor and is connected in this junction and draws the exit point of electric wire as H-bridge circuit.The stability of the operation of further raising circuit, reduces energy consumption, and heat radiation is few, can reduce the spectral energy density that motor drives EMI better, reduce the appearance of strong EMI.
as to preferably of the present utility model, the frequency presetting the output signal of spectrum circuits equals 1/2nd of the electromagnetic interference highest frequency that motor produces.Further improve the stability of the operation of circuit, reduce energy consumption, heat radiation is few, can reduce the spectral energy density that motor drives EMI better, reduce the appearance of strong EMI.
the beneficial effects of the utility model: Stability Analysis of Structures, less and endanger little, heat radiation is few, not easily always damages, and reduces the spectral energy density that motor drives EMI for safe and reliable to operation, power consumption.
Accompanying drawing explanation
fig. 1 is the circuit theory diagrams of the utility model embodiment;
fig. 2 is the H-bridge circuit schematic diagram of the utility model embodiment;
fig. 3 is the motor coil schematic diagram of the utility model embodiment.
in figure: 1, motor coil, 2, EMI transducer, 3, time-domain and frequency-domain change-over circuit, 4, subtraction circuit, 5, preset spectrum circuits, 6, integrating circuit, 7, frequency jitter circuit, 8, pwm circuit, 9, H-bridge drive circuit, 10, H-bridge circuit, 101, power end, 102, earth terminal, the 103, first metal-oxide-semiconductor, the 104, second metal-oxide-semiconductor.
Embodiment
following specific embodiment is only to explanation of the present utility model; it is not to restriction of the present utility model; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this specification, as long as but be all subject to the protection of Patent Law in right of the present utility model.
embodiment, as Fig. 1, 2, shown in 3, a kind of low EMI motor driver, comprise drive circuit, drive circuit comprises motor coil 1, be placed in the EMI transducer 2 of motor driver by motor coil 1 part, the output of the sensor circuit of described EMI transducer 2 is connected to the input of a time-domain and frequency-domain change-over circuit 3, the output of described time-domain and frequency-domain change-over circuit 3 is connected to the input of a subtraction circuit 4, the input of described subtraction circuit 4 is also connected with an output presetting spectrum circuits 5, the output of described subtraction circuit 4 is connected to the input of an integrating circuit 6, the output of described integrating circuit 6 is connected to the input of a frequency jitter circuit 7, the input of described frequency jitter circuit 7 is also connected with the output of a pwm circuit 8, the output of described frequency jitter circuit 7 is connected to the input of a H-bridge drive circuit 9, the output of described H-bridge drive circuit 9 is connected to the input of a H-bridge circuit 10, the output of described H-bridge circuit 10 is connected to motor coil 1, described H-bridge drive circuit 9 is three-phase H-bridge drive circuit, described H-bridge circuit 10 is three-phase H-bridge circuit, motor coil 1 is three phase electric machine coil.
h-bridge circuit 10 comprises power end 101 and earth terminal 102, three branch roads are parallel with between described power end 101 and earth terminal 102, every bar branch road is all in series with two metal-oxide-semiconductor field effect transistors, be respectively the first metal-oxide-semiconductor 103 and the second metal-oxide-semiconductor 104, the grid of each metal-oxide-semiconductor field effect transistor is connected with the exit point of H-bridge drive circuit 9 output as the input endpoint of H-bridge circuit 10 input, the source electrode of the first metal-oxide-semiconductor 103 is connected with power end 101, the source electrode of the second metal-oxide-semiconductor 104 is connected with earth terminal 102, the drain electrode of the first metal-oxide-semiconductor 103 on same branch road is connected with the drain electrode of the second metal-oxide-semiconductor 104 and is connected in this junction and draws the exit point of electric wire as H-bridge circuit 10.The frequency presetting the output signal of spectrum circuits 5 equals 1/2nd of the electromagnetic interference highest frequency that motor produces.
Claims (3)
1. one kind low EMI motor driver, comprise drive circuit, it is characterized in that: drive circuit comprises motor coil (1), be placed in the EMI transducer (2) of motor driver by motor coil (1) part, the output of the sensor circuit of described EMI transducer (2) is connected to the input of a time-domain and frequency-domain change-over circuit (3), the output of described time-domain and frequency-domain change-over circuit (3) is connected to the input of a subtraction circuit (4), the input of described subtraction circuit (4) is also connected with an output presetting spectrum circuits (5), the output of described subtraction circuit (4) is connected to the input of an integrating circuit (6), the output of described integrating circuit (6) is connected to the input of a frequency jitter circuit (7), the input of described frequency jitter circuit (7) is also connected with the output of a pwm circuit (8), the output of described frequency jitter circuit (7) is connected to the input of a H-bridge drive circuit (9), the output of described H-bridge drive circuit (9) is connected to the input of a H-bridge circuit (10), the output of described H-bridge circuit (10) is connected to motor coil (1), described H-bridge drive circuit (9) is three-phase H-bridge drive circuit, described H-bridge circuit (10) is three-phase H-bridge circuit, motor coil (1) is three phase electric machine coil.
2. the low EMI motor driver of one according to claim 1, it is characterized in that: H-bridge circuit (10) comprises power end (101) and earth terminal (102), three branch roads are parallel with between described power end (101) and earth terminal (102), every bar branch road is all in series with two metal-oxide-semiconductor field effect transistors, be respectively the first metal-oxide-semiconductor (103) and the second metal-oxide-semiconductor (104), the grid of each metal-oxide-semiconductor field effect transistor is connected with the exit point of H-bridge drive circuit (9) output as the input endpoint of H-bridge circuit (10) input, the source electrode of the first metal-oxide-semiconductor (103) is connected with power end (101), the source electrode of the second metal-oxide-semiconductor (104) is connected with earth terminal (102), the drain electrode of the first metal-oxide-semiconductor (103) on same branch road is connected with the drain electrode of the second metal-oxide-semiconductor (104) and is connected in this junction and draws the exit point of electric wire as H-bridge circuit (10).
3. the low EMI motor driver of one according to claim 2, is characterized in that: the frequency presetting the output signal of spectrum circuits (5) equals 1/2nd of the electromagnetic interference highest frequency that motor produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520263619.1U CN204539035U (en) | 2015-04-28 | 2015-04-28 | A kind of low EMI motor driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520263619.1U CN204539035U (en) | 2015-04-28 | 2015-04-28 | A kind of low EMI motor driver |
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| Publication Number | Publication Date |
|---|---|
| CN204539035U true CN204539035U (en) | 2015-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520263619.1U Expired - Fee Related CN204539035U (en) | 2015-04-28 | 2015-04-28 | A kind of low EMI motor driver |
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| Country | Link |
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| CN (1) | CN204539035U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767461A (en) * | 2015-04-28 | 2015-07-08 | 浙江格兰菲德电子科技有限公司 | Low EMI motor driver |
| CN104779888A (en) * | 2015-04-28 | 2015-07-15 | 浙江格兰菲德电子科技有限公司 | Low EMI motor driver structure |
-
2015
- 2015-04-28 CN CN201520263619.1U patent/CN204539035U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767461A (en) * | 2015-04-28 | 2015-07-08 | 浙江格兰菲德电子科技有限公司 | Low EMI motor driver |
| CN104779888A (en) * | 2015-04-28 | 2015-07-15 | 浙江格兰菲德电子科技有限公司 | Low EMI motor driver structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20170428 |