CN202679290U - Rotation speed self-adjustment system for vehicle-mounted direct current brushless fan - Google Patents
Rotation speed self-adjustment system for vehicle-mounted direct current brushless fan Download PDFInfo
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- CN202679290U CN202679290U CN 201220255082 CN201220255082U CN202679290U CN 202679290 U CN202679290 U CN 202679290U CN 201220255082 CN201220255082 CN 201220255082 CN 201220255082 U CN201220255082 U CN 201220255082U CN 202679290 U CN202679290 U CN 202679290U
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- circuit
- speed self
- active filter
- rotation speed
- direct current
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Abstract
The utility model relates to a rotation speed self-adjustment system for a vehicle-mounted direct current brushless fan, which comprises a second-order active filter circuit, a comparison circuit, a logic processing circuit, an inverter circuit, a brushless motor, a sampling resistor and an amplification circuit, wherein the input end of the comparison circuit is respectively connected with the second-order active filter circuit and the amplification circuit, and the output end is sequentially connected with the logic processing circuit, the inverter circuit and the brushless motor; and the inverter circuit is sequentially connected with the sampling resistor and the amplification circuit. Compared with the prior art, the rotation speed self-adjustment system for the vehicle-mounted direct current brushless fan provided by the utility model has the advantages of simple and reliable circuit, low cost, high efficiency and the like.
Description
Technical field
The utility model relates to a kind of dc brushless motor speed regulating device, especially relates to a kind of Vehicular direct-current brushless fan rotating speed self-adjusting system.
Background technology
At present, domestic most car air-conditioner blower fan adopts brush direct current motor.Brush direct current motor can produce electric spark between carbon brush and the commutator when rotating, and, the problems such as efficient low, job insecurity large with noise.Simultaneously, have the brush blower fan to adopt to stir stepping, the rheostatic speed regulation mode is controlled rotation speed of fan, this control mode can't realize the stepless speed regulation of blower fan; especially when low speed; the resistance power consumption is large and heating is severe, and not only system works efficient is low, and speed adjusting resistance also often can be burned.The problems such as in addition, some has the brush blower fan also to adopt the PWM speed adjusting module, although can realize the stepless speed regulation of blower fan, when low speed, the blower fan consumed power can occur equally large, and efficient is low.Now, what the use of small part vehicle fan was also arranged is dc brushless motor, adopts common speed control of open loop mode, and this control mode is difficult for realization to the Current Control of motor, load slightly changes and will cause the fluctuation of rotating speed and electric current, and then can affect the stability of fan performance.
Summary of the invention
The purpose of this utility model is exactly to provide the Vehicular direct-current brushless fan adjustment of rotational speed that a kind of circuit is simple and reliable, cost is low, efficient is high system for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of Vehicular direct-current brushless fan rotating speed self-adjusting system, comprise second-order active filter circuit, comparison circuit, logic processing circuit, inverter bridge circuit, brushless electric machine, sampling resistor and amplifying circuit, the input of described comparison circuit connects respectively second-order active filter circuit and amplifying circuit, output connects logic processing circuit, inverter bridge circuit and brushless electric machine successively, and described inverter bridge circuit connects sampling resistor and amplifying circuit successively.
The input of described second-order active filter circuit connects outside PWM modulator or aanalogvoltage speed-regulating signal.
Compared with prior art, the utlity model has following advantage:
One, the utility model is incorporated into brshless DC motor speed governing field with torque control, need not complicated circuit, can realize the current closed-loop control of brushless electric machine, circuit is simple and reliable, cost is low also can to suppress the brushless electric machine torque pulsation simultaneously preferably, so that rotation speed of fan is steady, noise is low;
Two, under the motor body same case, with upper different impeller, the air quantity of blower fan can be consistent, and rotating speed control is changed different impellers and wanted the air quantity that reaches identical, then needs motor body is made amendment, and adjusts to bother.
During three, owing to work, the rapid sudden change of electric current can not occur, so blower fan metal-oxide-semiconductor when work is difficult for being hit and damages;
Four, under the motor body same case, through the dynamometer machine test, high approximately 5 percentage points of the blower fan system efficient specific speed control under the utility model, and blower fan is controlled and will be grown at the operating time of high efficiency point specific speed;
Five, electric current can not increase during motor rotation blockage, therefore on the not impact of control of blower fan;
Six, simply increasing circuit can realize the fan speed closed-loop control.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of Vehicular direct-current brushless fan rotating speed self-adjusting system, utilize torque control to replace blower fan pure rotating speed control commonly used, this system comprises second-order active filter circuit 1, comparison circuit 2, logic processing circuit 3, inverter bridge circuit 4, brushless electric machine 5, sampling resistor 6 and amplifying circuit 7, the input of described comparison circuit 2 connects respectively second-order active filter circuit 1 and amplifying circuit 7, output connects logic processing circuit 3, inverter bridge circuit 4 and brushless electric machine 5 successively, and described inverter bridge circuit 4 connects sampling resistor 6 and amplifying circuit 7 successively.
The utility model utilizes operational amplifier to make up a real-time Dynamic comparison circuit 7, comparison circuit 7 one terminal voltage U
1Given through 1 conversion of second-order active filter circuit by outside PWM modulator or aanalogvoltage DC signal, other end input voltage U
27 amplifications form U by sampling resistor 7 collection brushless electric machine 5 bus currents conversions and through amplifying circuit
1And U
2Carry out real-time Dynamic comparison.Work as U
1＞U
2The time, the comparator output voltage U
0Give logic processing circuit 3 and trigger its switching signal that produce to improve motor speed and remove to control inverter bridge circuit 4, motor speed increases, and then fans load increases, and then bus current I increases, so U
2Increase, work as U
2Increase to and U
1Equate and when reaching dynamic equilibrium, it is constant that logic processing circuit 3 will be kept this switching signal, thus blower fan stable operation.In like manner, work as U
1＜U
2The time, U
0Trigger logic processing circuit 3 and send the switch controlling signal that reduces motor speed, motor speed descends, and fans load diminishes, and electric current I diminishes, U
2Diminish, work as U
2Be reduced to and U
1Equate and when reaching dynamic equilibrium, it is constant that logic processing circuit 3 will be kept this switching signal, guarantee blower fan stable operation.
Claims (2)
1. Vehicular direct-current brushless fan rotating speed self-adjusting system, it is characterized in that, comprise second-order active filter circuit, comparison circuit, logic processing circuit, inverter bridge circuit, brushless electric machine, sampling resistor and amplifying circuit, the input of described comparison circuit connects respectively second-order active filter circuit and amplifying circuit, the output of described comparison circuit, logic processing circuit, inverter bridge circuit are connected with brushless electric machine and are connected, and described inverter bridge circuit, sampling resistor are connected with amplifying circuit and are connected.
2. a kind of Vehicular direct-current brushless fan rotating speed self-adjusting system according to claim 1 is characterized in that, the input of described second-order active filter circuit connects outside PWM modulator or aanalogvoltage speed-regulating signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220255082 CN202679290U (en) | 2012-05-31 | 2012-05-31 | Rotation speed self-adjustment system for vehicle-mounted direct current brushless fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220255082 CN202679290U (en) | 2012-05-31 | 2012-05-31 | Rotation speed self-adjustment system for vehicle-mounted direct current brushless fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202679290U true CN202679290U (en) | 2013-01-16 |
Family
ID=47500162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220255082 Expired - Fee Related CN202679290U (en) | 2012-05-31 | 2012-05-31 | Rotation speed self-adjustment system for vehicle-mounted direct current brushless fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202679290U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104109A (en) * | 2020-09-11 | 2020-12-18 | 浙江大学 | Controller circuit for wireless power transmission system |
-
2012
- 2012-05-31 CN CN 201220255082 patent/CN202679290U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112104109A (en) * | 2020-09-11 | 2020-12-18 | 浙江大学 | Controller circuit for wireless power transmission system |
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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: 20130116 Termination date: 20180531 |