CN1221249A - Wave-wide regulation controlled electric circuit for D. C. brushless fan - Google Patents
Wave-wide regulation controlled electric circuit for D. C. brushless fan Download PDFInfo
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- CN1221249A CN1221249A CN 97126314 CN97126314A CN1221249A CN 1221249 A CN1221249 A CN 1221249A CN 97126314 CN97126314 CN 97126314 CN 97126314 A CN97126314 A CN 97126314A CN 1221249 A CN1221249 A CN 1221249A
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- fan
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- voltage
- controlled electric
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
An automatic waveform width controller for brushless DC fan features that it includes a rectifier connected to signal pick-up line of fan, a voltage comparator for comparing reference voltage with output signal of rectifier, and a control switch connected to power supply of fan and controlled by the voltage comparactor. A square-wave signal is sent from fan to rectifier. A square-wave signal is sent from fan to rectifier. After voltage comparison, the comparator sets a waveform width control signal to control switch to make rotational speed of fan constant or variable with ambient temp.
Description
The present invention relates to a kind of control circuit, relate in particular to a kind of brush DC fan Wave-wide regulation controlled electric circuit of rotating speed of the small-sized DC brush-less fan of controlling power supply source supply or computer and microcomputer chip heat transmission.
The structure of tradition brush DC fan, because it is more small-sized and applies to the very not strict occasion of rotating speed requirement, so only be designed to have the kenel of power input, yet require gradually strict today for heat radiation, must control or record the operational situation of fan effectively, make its not the reason rotating speed cross low and cause dispelling the heat bad or not reason stop the rotation and the problem that causes electronic component to burn, the notion that therefore the so-called privates of utilization is just arranged, that is be in the fan internal control circuit, to draw a signal to detect lead, and this forms a kind of square-wave signal that is synchronized with rotation speed change at the lead place, Shu Chu square-wave signal thus, can measure and relevant control by outside line, caution when not turning round, the relevant utilization of unusual indication or other of turning round, yet the above-mentioned also only the most basic utilization of genus, and for the heart of personal computer (CPU) now, because the high heat that under high clock pulse operation, is produced, badly cause element to burn reducing because of dispelling the heat easily with causing operating efficiency, so fan is maintained at certain rotating speed, and the design that can be automatic adjustment rotating speed along with ambient temperature just can be guaranteed better heat radiating effect, so based on this requirement, this creation human desires provides a solution.
The object of the present invention is to provide a kind of brush DC fan Wave-wide regulation controlled electric circuit, it can make rotation speed of the fan maintain certain value, and can dynamically change rotation speed of the fan with ambient temperature, thereby reaches the most appropriate radiating effect.
The object of the present invention is achieved like this:
A kind of brush DC fan Wave-wide regulation controlled electric circuit, its characteristics are to comprise:
One rectification circuit, the signal that can pick up the brush DC fan detects the square-wave signal that lead is sent, and giving rectification is the direct voltage signal,
One voltage comparator, the one end is connected with rectification circuit, and its other end is to be connected with a reference voltage,
One control switch, its control end is connected with the voltage comparator output, and its input and output are connected with feeder ear and fan power supply end respectively.
In above-mentioned brush DC fan Wave-wide regulation controlled electric circuit, wherein, described reference voltage can be made of the electric resistance partial pressure networking.
In above-mentioned brush DC fan Wave-wide regulation controlled electric circuit, wherein, described reference voltage can form the dividing potential drop networking by a resistance and with thermistor serial connection, compensates with formation temperature.
In above-mentioned brush DC fan Wave-wide regulation controlled electric circuit, wherein, described rectification circuit comprises a high-pass filtering networking and rectifying and wave-filtering networking, makes output voltage and the proportional relation of input signal frequency.
The present invention is owing to be provided with a Wave-wide regulation controlled electric circuit, the back coupling control action that fan is had decide rotating speed; Simultaneously, be connected in series with a divider resistance and form, make it to have concurrently the effect of the dynamic adjustment rotating speed of temperature-compensating, so the service efficiency of fan is got a promotion because the reference voltage of voltage comparator is a thermistor by a negative temperature coefficient.
By the description of a following embodiment to brush DC fan Wave-wide regulation controlled electric circuit of the present invention, can further understand purpose of the present invention, architectural feature and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is the circuit block diagram according to the brush DC fan Wave-wide regulation controlled electric circuit of the present invention's proposition.
Fig. 2 is the detailed circuit diagram according to the brush DC fan Wave-wide regulation controlled electric circuit of the present invention's proposition.
Fig. 3 is the output waveform according to control switch in the brush DC fan Wave-wide regulation controlled electric circuit of the present invention's proposition.
Fig. 4 is according to the output voltage of rectification circuit and the characteristic curve of input signal frequency in the brush DC fan Wave-wide regulation controlled electric circuit of the present invention's proposition.
Brush DC fan Wave-wide regulation controlled electric circuit of the present invention is shown in the frame of broken lines of Fig. 1, be with a rectification circuit 10, one voltage comparator 20 and a control switch 30 are formed, wherein this rectification circuit 10 signal of picking up fan 50 detects the continuous square-wave signal that end (T) is sent, and after rectification circuit 10 carries out square-wave signal filtering and rectification and is a direct current voltage, be fed through the negative-phase input (-) of voltage comparator 20, the normal phase input end (+) of voltage comparator 20 is to be connected with a reference voltage of presetting, set point for setting rotating speed of fan, the output of voltage comparator 20 is as the controlling signal of control switch 30, and control switch 30 can be the electronic switch of a transistor or equivalence, it is to be serially connected with between the voltage input end of power source supply end and fan 50, this control switch 30 can make direct voltage and the reference voltage (VREF) sent into by rectification circuit 10 compare, when if the voltage that rectification circuit 10 is sent into voltage comparator is lower than reference voltage (rotating speed is lower), voltage comparator 20 output HIGH voltages and make control switch 30 connect then, and fan 50 rotating speeds are improved, and when rotation speed of the fan surpasses desired speed, rectification circuit 10 output voltages surpass reference voltage (VREF), then make voltage comparator 20 outputs change electronegative potential into and make control switch 30 close, make fan 50 outages, and then heavily cover and aforementionedly constantly make control switch 30 be intermittent opening and closing, and make fan 50 be maintained at a fixed rotating speed state, and control switch 30 output waveforms promptly form and open and close and open and close width a kind of intermittence as shown in Figure 3 and also just change and the pattern of modulation along with rotating speed, that is are the rotating-speed control circuits that forms a kind of Wave-wide regulation controlled electric.
That shown in Figure 2 is detail circuits figure, this rectification circuit 10 is to constitute the high-pass filtering networking with electric capacity 11 and a resistance 14, and with two diodes 12,13 and filter capacitor 15 constitute rectifying and wave-filterings, and the square-wave signal that makes reception can be exchanged into the direct voltage signal, and the adding at this high-pass filtering networking, more make the output voltage can be with the proportional relationship change of frequency (as Fig. 4), so, can measure fan 50 rotating speeds by the output voltage of rectification circuit 10, be connected in series with a divider resistance and form and the reference voltage of this supply voltage comparator 20 is thermistors 40 by a negative temperature coefficient, obtain a reference voltage level by its dividing potential drop end points place, and the design of this thermistor 40, can make it have effect temperature compensation concurrently, that is when ambient temperature raises, make the impedance of thermistor 40 descend relatively, that is the feasible reference voltage rising (heightening speed reference) that is fed through voltage comparator 20, so, can make fan 50 maintain the higher rotation speed state, otherwise, if ambient temperature is reduced to standard value when following, the also corresponding speed reference that makes descends, and promptly keeps fan in than low speed state, and the usefulness that can dynamically change rotation speed of the fan with ambient temperature is provided.
But the present invention is the rotating-speed control circuit of the small-sized DC brush-less fan of a kind of power supply source supply or computer and microcomputer chip heat radiation purposes, the control action that it can make fan have to decide rotating speed and dynamically change rotation speed of the fan along with variation of ambient temperature, the back coupling control action that fan is had decide rotating speed, simultaneously also have the effect of the dynamic adjustment rotating speed of temperature-compensating concurrently, thereby promoted the fan service efficiency.
Claims (4)
1. brush DC fan Wave-wide regulation controlled electric circuit is characterized in that comprising:
One rectification circuit, the signal that can pick up the brush DC fan detects the square-wave signal that lead is sent, and giving rectification is the direct voltage signal,
One voltage comparator, the one end is connected with rectification circuit, and its other end is to be connected with a reference voltage,
One control switch, its control end is connected with the voltage comparator output, and its input and output are connected with feeder ear and fan power supply end respectively.
2. brush DC fan Wave-wide regulation controlled electric circuit according to claim 1 is characterized in that: described reference voltage can be made of the electric resistance partial pressure networking.
3. brush DC fan Wave-wide regulation controlled electric circuit according to claim 1 is characterized in that: described reference voltage can form the dividing potential drop networking by a resistance and with thermistor serial connection, compensates with formation temperature.
4. brush DC fan Wave-wide regulation controlled electric circuit according to claim 1 is characterized in that: described rectification circuit comprises a high-pass filtering networking and rectifying and wave-filtering networking, makes output voltage and the proportional relation of input signal frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97126314A CN1061800C (en) | 1997-12-23 | 1997-12-23 | Wave-wide regulation controlled electric circuit for D. C. brushless fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97126314A CN1061800C (en) | 1997-12-23 | 1997-12-23 | Wave-wide regulation controlled electric circuit for D. C. brushless fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1221249A true CN1221249A (en) | 1999-06-30 |
| CN1061800C CN1061800C (en) | 2001-02-07 |
Family
ID=5177632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97126314A Expired - Fee Related CN1061800C (en) | 1997-12-23 | 1997-12-23 | Wave-wide regulation controlled electric circuit for D. C. brushless fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061800C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501169C (en) * | 2006-05-26 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Luminous air blower |
| CN1758171B (en) * | 2004-10-10 | 2010-05-12 | 仁宝电脑工业股份有限公司 | Method for automatic fine regulating rotation speed of heat radiation fan |
| CN103124156B (en) * | 2001-12-03 | 2016-06-22 | 台达电子工业股份有限公司 | Use the fan control system of single-chip |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0130537B1 (en) * | 1994-05-31 | 1998-04-09 | 이대원 | Brushless dc motor control system |
-
1997
- 1997-12-23 CN CN97126314A patent/CN1061800C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124156B (en) * | 2001-12-03 | 2016-06-22 | 台达电子工业股份有限公司 | Use the fan control system of single-chip |
| CN1758171B (en) * | 2004-10-10 | 2010-05-12 | 仁宝电脑工业股份有限公司 | Method for automatic fine regulating rotation speed of heat radiation fan |
| CN100501169C (en) * | 2006-05-26 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Luminous air blower |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1061800C (en) | 2001-02-07 |
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