CN215805347U - High-speed fan control circuit - Google Patents
High-speed fan control circuit Download PDFInfo
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- CN215805347U CN215805347U CN202121832235.9U CN202121832235U CN215805347U CN 215805347 U CN215805347 U CN 215805347U CN 202121832235 U CN202121832235 U CN 202121832235U CN 215805347 U CN215805347 U CN 215805347U
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Abstract
The utility model discloses a high-speed fan control circuit, and belongs to the field of fan equipment. The control circuit includes: the high-speed fan comprises a rectifier bridge, an inverter bridge and a filter, wherein the rectifier bridge is connected with a power supply, the inverter bridge is connected with the rectifier bridge, the input end of the filter is connected with the inverter bridge, the output end of the filter is connected with the high-speed fan, when the high-speed fan works, alternating current output by the power supply is converted into direct current by the rectifier bridge, the direct current is converted into high-frequency square waves by the inverter bridge, and harmonic waves of the current are filtered by the filter. The utility model filters the harmonic wave of the current through the filter, can reduce the electromagnetic noise of the fan, improve the efficiency of the fan and reduce the interference to other surrounding electronic equipment.
Description
Technical Field
The utility model belongs to the field of fan equipment, and particularly relates to a high-speed fan control circuit.
Background
The existing high-speed fan has the characteristic of high power density, an inverter for driving the fan is driven and controlled through PWM square wave voltage, the switching frequency of the inverter is very high, the driving current of the fan has a lot of harmonic waves, the current harmonic waves can reduce the efficiency of the fan, even electromagnetic noise can be caused, and the normal work of other surrounding electronic equipment can be seriously interfered.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model provides a high-speed fan control circuit to solve the above-mentioned problem that prior art exists.
The technical scheme is as follows: a high-speed fan control circuit is arranged between a power supply and a high-speed fan and has the function of filtering the drive current harmonic waves of the high-speed fan.
The control circuit includes: and the rectifier bridge is connected with a power supply.
And the inverter bridge is connected with the rectifier bridge.
And the input end of the filter is connected with the inverter bridge, and the output end of the filter is connected with the high-speed fan.
When the high-speed fan works, the rectifier bridge converts alternating current output by the power supply into direct current, the inverter bridge converts the direct current into high-frequency square waves, and the filter filters harmonic waves of the current.
In a further embodiment, the filter comprises: and the input end of the filter inductor is connected with the inverter bridge.
And the input end of the filter resistor is connected with the output end of the filter inductor.
And the input end of the fan resistor is connected with the output end of the filter inductor.
And the input end of the fan inductor is connected with the output end of the fan resistor.
And one end of the filter capacitor is connected with the output end of the filter resistor and the input end of the fan resistor, the other end of the filter capacitor is grounded, and an LCL type filter is formed by the filter inductor, the filter resistor, the fan resistor and the fan inductor, so that a better filtering effect can be obtained.
In a further embodiment, the high-speed fan control circuit further comprises: and the input end of the voltage detection circuit is connected with the output end of the filter.
And the microprocessor is connected with the current detection circuit and the voltage detection circuit.
When the high-speed fan works, the voltage detection circuit detects the back electromotive voltage of the high-speed fan.
In a further embodiment, the microprocessor comprises: and the input capturing unit is connected with the output end of the voltage detection circuit.
And the speed error calculation unit is connected with the output end of the input capturing unit.
And the rotating speed PID control unit is connected with the output end of the speed error calculation unit.
And the phase compensation control unit is connected with the output end of the rotating speed PID control unit.
And the current adjusting unit is connected with the output end of the phase compensation control unit.
And the PWM control unit is connected with the output end of the current regulating unit.
And the output end of the PWM control unit is connected with the inverter bridge.
In a further embodiment, the high-speed fan control circuit further comprises: and the input end of the current detection circuit is connected with the output end of the filter, and the current detection circuit acquires the working current of the high-speed fan.
The microprocessor further includes: and the AD sampling unit is connected with the output end of the current detection circuit.
The output end of the AD sampling unit is connected with the input end of the current adjusting unit, current loop control is added on the basis of a speed loop, and the speed control system is guaranteed to have the same performance under the conditions of current interruption and continuity.
In a further embodiment, the high-speed fan control circuit further comprises: and the start-stop control circuit is connected with the microprocessor and controls the start and stop of the high-speed fan.
The microprocessor further includes: the I/O port is connected with the start-stop control circuit and the PWM control unit, the current detection circuit collects the working current of the high-speed fan, the working current is used for detecting the current state of the fan during overcurrent and operation and is also used as the input of the current regulator, the purpose is to increase current loop control on the basis of a speed loop to ensure that a speed control system has the same performance under the conditions of current interruption and current continuity, and the voltage detection circuit is used for detecting the reverse electromotive voltage and realizing the phase change control of the high-speed fan according to the zero-crossing point of the reverse electromotive voltage.
Has the advantages that: the utility model discloses a high-speed fan control circuit which filters harmonic waves of current through a filter, can reduce electromagnetic noise of a fan, improves the efficiency of the fan, and reduces interference on other surrounding electronic equipment.
Drawings
FIG. 1 is a schematic diagram of the general architecture of the high-speed fan control system with filter according to the present invention.
Fig. 2 is a schematic diagram of the filter principle of the present invention.
Fig. 3 is a schematic diagram of the phase compensation controller principle of the present invention.
The reference numerals shown in fig. 1 to 3 are: the fan comprises a filter resistor R1, a fan resistor R2, a filter inductor L1, a fan inductor L2 and a filter capacitor C1.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.
The application discloses can filter drive current's harmonic, improve fan efficiency, reduce electromagnetic noise's high-speed fan control circuit.
The control circuit is arranged between the power supply and the high-speed fan and has the function of filtering the driving current harmonic waves of the high-speed fan.
The control circuit includes: a rectifier bridge, an inverter bridge and a filter.
The rectifier bridge is connected with the power supply, the inverter bridge is connected with the rectifier bridge, the input end of the filter is connected with the inverter bridge, and the output end of the filter is connected with the high-speed fan.
When the high-speed fan works, the rectifier bridge converts alternating current output by the power supply into direct current, the inverter bridge converts the direct current into high-frequency square waves, and the filter filters harmonic waves of the current.
In this embodiment, the filter includes: the fan comprises a filter inductor L1, a filter resistor R1, a fan resistor R2 and a fan inductor L2.
The input end of a filter inductor L1 is connected with an inverter bridge, the input end of a filter resistor R1 is connected with the output end of a filter inductor L1, the input end of a fan resistor R2 is connected with the output end of a filter inductor L1, the input end of a fan inductor L2 is connected with the output end of a fan resistor R2, one end of a filter capacitor C1 is connected with the output end of the filter resistor R1 and the input end of a fan resistor R2, the other end of the filter capacitor C1 is grounded, wherein the output end of the fan inductor L2 is connected with a high-speed fan
The working principle is as follows: the three-phase alternating current power supply is used for supplying power to a system, the rectifier bridge is used for converting alternating current into direct current, and the inverter bridge is used for converting the direct current output by the rectifier bridge into high-frequency square waves and driving a high-speed fan rotor.
The LCL type filter is formed by the filter inductor L1, the filter resistor R1, the fan resistor R2 and the fan inductor L2, and a better filter effect can be obtained.
The filter filters the harmonic waves of the current, so that the electromagnetic noise of the fan can be reduced, the efficiency of the fan is improved, and the interference to other surrounding electronic equipment is reduced.
In a further embodiment, the control circuit further comprises: a voltage detection circuit and a microprocessor.
The input end of the voltage detection circuit is connected with the output end of the filter.
The microprocessor is connected with the current detection circuit and the voltage detection circuit.
When the high-speed fan works, the voltage detection circuit detects the back electromotive voltage of the high-speed fan.
In this embodiment, the microprocessor includes: the device comprises an input capturing unit, a speed error calculating unit, a rotating speed PID control unit, a phase compensation control unit, a current adjusting unit and a PWM control unit.
The input capturing unit is connected with the output end of the voltage detection circuit, the speed error calculation unit is connected with the output end of the input capturing unit, the rotating speed PID control unit is connected with the output end of the speed error calculation unit, the phase compensation control unit is connected with the output end of the rotating speed PID control unit, the current regulation unit is connected with the output end of the phase compensation control unit, the PWM control unit is connected with the output end of the current regulation unit, and the output end of the PWM control unit is connected with the inverter bridge.
In a further embodiment, the control circuit further comprises: a current detection circuit.
The input end of the current detection circuit is connected with the output end of the filter, and the current detection circuit collects the working current of the high-speed fan.
The microprocessor further includes: and the AD sampling unit is connected with the output end of the current detection circuit.
And the output end of the AD sampling unit is connected with the input end of the current regulating unit.
The current loop control is added on the basis of the speed loop, so that the speed control system has the same performance under the conditions of current interruption and continuity.
In a further embodiment, the control circuit further comprises: and a start-stop control circuit.
The start-stop control circuit is connected with the microprocessor and controls the start and stop of the high-speed fan.
The microprocessor further includes: and the I/O port is connected with the start-stop control circuit and the PWM control unit.
The working principle of the embodiment is as follows: the current detection circuit collects the working current of the high-speed fan and inputs the current signal i to the leading phase compensation calculation module, the device is used for detecting the current state of the fan during overcurrent and operation and simultaneously used as the input of a current regulator, aims to add current loop control on the basis of a speed loop and ensure that a speed control system has the same performance under the conditions of current interruption and continuity, a voltage detection circuit is used for detecting the voltage of a reverse electromotive force, the phase change control of the high-speed fan is realized according to the counter potential zero crossing point, a rotating speed PID controller in the microprocessor, the output control quantity is adjusted according to the detected actual rotating speed omega of the fan and the given rotating speed to control the inverter bridge, the phase compensation controller adopts a leading phase compensation method, the start-stop control circuit is used for compensating the phase lag caused by the introduction of the filter and controlling the start and stop of the high-speed fan.
Phase compensation controller as shown in fig. 3, the lead phase compensation calculation module works according to the following principle: the method comprises the steps of calculating a transfer function relation between inverter output PWM current and high-speed fan stator current according to a motor driving system mathematical model with a filter, calculating a rotating speed phase lag corresponding table fitted with corresponding current lag phase angles at different rotating speeds according to amplitude-frequency characteristics of the inverter output current passing through the filter, obtaining the phase lag angle theta through table lookup to compensate to the detected phase angle theta according to the detected motor rotating speed omega, wherein d/dt represents a calculation algorithm of the motor rotating speed omega.
The high-speed fan control system with the filter provided by the embodiment filters harmonic waves in fan current by using the LCL filter, so that the working efficiency of the motor is improved, and the electromagnetic noise of the motor is reduced. The phase compensation controller improves the steady-state performance of the motor, so that the current waveform of the fan is smoother, and the torque and the rotating speed oscillation of the fan are reduced. The defects of the traditional high-speed fan in working efficiency and electromagnetic interference are overcome, and the high-speed fan has great economic value and social value.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (6)
1. A high-speed fan control circuit is arranged between a power supply and a high-speed fan and has the function of filtering the drive current harmonic waves of the high-speed fan;
it is characterized by comprising:
the rectifier bridge is connected with a power supply;
the inverter bridge is connected with the rectifier bridge;
the input end of the filter is connected with the inverter bridge, and the output end of the filter is connected with the high-speed fan;
when the high-speed fan works, the rectifier bridge converts alternating current output by the power supply into direct current, the inverter bridge converts the direct current into high-frequency square waves, and the filter filters harmonic waves of the current.
2. The high-speed fan control circuit of claim 1, wherein the filter comprises:
the input end of the filter inductor is connected with the inverter bridge;
the input end of the filter resistor is connected with the output end of the filter inductor;
the input end of the fan resistor is connected with the output end of the filter inductor;
the input end of the fan inductor is connected with the output end of the fan resistor;
and one end of the filter capacitor is connected with the output end of the filter resistor and the input end of the fan resistor, and the other end of the filter capacitor is grounded.
3. The high-speed fan control circuit of claim 1, further comprising:
the input end of the voltage detection circuit is connected with the output end of the filter;
the microprocessor is connected with the current detection circuit and the voltage detection circuit;
when the high-speed fan works, the voltage detection circuit detects the back electromotive voltage of the high-speed fan.
4. The high-speed fan control circuit of claim 3, wherein the microprocessor comprises:
the input capturing unit is connected with the output end of the voltage detection circuit;
the speed error calculation unit is connected with the output end of the input capture unit;
the rotating speed PID control unit is connected with the output end of the speed error calculation unit;
the phase compensation control unit is connected with the output end of the rotating speed PID control unit;
the current adjusting unit is connected with the output end of the phase compensation control unit;
the PWM control unit is connected with the output end of the current regulating unit;
and the output end of the PWM control unit is connected with the inverter bridge.
5. The high-speed fan control circuit of claim 4, further comprising:
the input end of the current detection circuit is connected with the output end of the filter, and the current detection circuit collects the working current of the high-speed fan;
the microprocessor further includes:
the AD sampling unit is connected with the output end of the current detection circuit;
and the output end of the AD sampling unit is connected with the input end of the current regulating unit.
6. The high-speed fan control circuit of claim 4, further comprising:
the start-stop control circuit is connected with the microprocessor and controls the start and stop of the high-speed fan;
the microprocessor further includes:
and the I/O port is connected with the start-stop control circuit and the PWM control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121832235.9U CN215805347U (en) | 2021-08-06 | 2021-08-06 | High-speed fan control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121832235.9U CN215805347U (en) | 2021-08-06 | 2021-08-06 | High-speed fan control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215805347U true CN215805347U (en) | 2022-02-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121832235.9U Active CN215805347U (en) | 2021-08-06 | 2021-08-06 | High-speed fan control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215805347U (en) |
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2021
- 2021-08-06 CN CN202121832235.9U patent/CN215805347U/en active Active
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