CN1680727A

CN1680727A - Controlling circuit of low-voltage high rotating speed rotation with high-voltage activation for DC fan motor

Info

Publication number: CN1680727A
Application number: CN 200410030670
Authority: CN
Inventors: 林盟智
Original assignee: Asia Vital Components Co Ltd
Current assignee: Asia Vital Components Co Ltd
Priority date: 2004-04-05
Filing date: 2004-04-05
Publication date: 2005-10-12

Abstract

A control circuit for direct current motor to be ignited at high voltage and run in high speed at low voltage comprises an input unit, an output unit, a control unit and a comparison unit. The input unit for power input links to the comparison unit and the control unit. The output unit includes coil group of motor and links to the control unit which controls the running of the motor. The comparison unit links to the control unit and controls the output current from the control unit. With these units, when the motor is ignited at high voltage, it won't be damaged by overload and can keep a high speed running at low voltage.

Description

The DC fan high pressure activates the control circuit of the high rotation speed operation of low pressure

Technical field

The present invention relates to the control circuit that a kind of DC fan high pressure activates the high rotation speed operation of low pressure, particularly a kind of control circuit that prevents that the motor control unit from damaging.

Background technique

The high speed development of information-intensive society, a large amount of electronic bits of datas is propagated and is handled to become the indispensable function of electronic product, yet thereupon promptly is to be accompanied by the phenomenon that produces high-temperature under this function, solves heat dissipation problem so electronic product need possess the splendid and less sink of self power consumption of heat dispersion.

And at present general common on the market sink, be radiation fan and radiator, the former utilizes the mode of thermoconvection to dispel the heat, the latter utilizes heat conducting mode to make it heat radiation, but, its heat dissipation of mandatory heat radiation that thermoconvection produced of radiation fan is preferable, is therefore favored research and development by present each businessman.

See also and Figure 1 shows that general known fan motor circuit, it comprises: a motor 11, include one first coil winding 111 at least, and second coil winding 112; One driver element 12, connect this motor 11, this driver element 12 includes a driven unit 121 and a Hall subassembly 122 at least, wherein this Hall subassembly 122 detects the rotor magnetic pole variation of this motor 11, produce positive voltage H+ and negative voltage H-output, connect driven unit 121 corresponding pin positions respectively, these driven unit 121 first output connecting pins 1211 connect this first coil winding 111, and second output connecting pin 1212 of this driven unit 121 connects this second coil winding 112, with drive motor 11 running starts.

The problem of above-mentioned known circuit is, general fan motor circuit motor 11 characteristics and to fix design is finished after, just the input voltage of motor 11 can become a proportional relation with rotating speed, T1 curve as shown in Figure 2, promptly for example: when input voltage was 12 volts (volt), the rotating speed of DC fan 11 was 4000 rev/mins (rpm); And when being 4 volts (volt) when input voltage, the rotating speed of DC fan 11 is 1000 rev/mins (rpm), and the rotating speed when the input voltage that set under this state shows slightly too low, can't efficiently radiates heat.

For the running of DC fan 11 when the low input can be improved, just make VDC motor 11 can when input voltage is 4 volts (volt), operate as 2300 rev/mins (rpm) from new design coil winding, yet this moment Yin Mada 11 characteristics, though can when identical low voltage, obtain high rotational speed, but identical high input voltage promotes high rotating speed also, promptly rotating speed is (a T2 curve as shown in Figure 2) between 8000 rev/mins (rpm) when 12 volts (volt), and the rotating speed height is the electric current increase, surpass 121 energy load currents of driven unit scope, very easily cause and burn or the anxiety of bad phenomenon generation.

Summary of the invention

Main purpose of the present invention provides and a kind ofly can improve rotation speed of the fan when low output voltage, so that its tool power saving can promote the control circuit that the DC fan high pressure of radiating effect activates the high rotation speed operation of low pressure again.

Another object of the present invention provides and a kind ofly can provide fan to run up when being output as low voltage, and its rotating speed can maintain same high rotating speed when being output as high voltage, that is driving current can maintain in the default safety value of control unit institute, prevent that fan is excessive because of the high pressure activated current, burn the control circuit that control unit causes fan to damage.

DC fan high pressure of the present invention activates the control circuit of the high rotation speed operation of low pressure, at least comprise an input unit, an output unit, a control unit, a comparing unit, wherein this input unit connects comparing unit and control unit, and for the input of input power supply, so that control circuit running; This output unit comprises the motor coil winding, it connects this control unit, turn round by control unit controlling and driving output unit, this comparing unit connects control unit, controls the output current of this control unit, by the combination of above-mentioned each unit, make motor when high pressure output activates, can do not burnt, and also can be kept at a high speed a running when exporting, to reach heat radiation and less electricity consumption in pressure drop to low pressure because of electric current causes control unit too greatly.

Above-mentioned purpose of the present invention and structure and functional characteristic will be illustrated with preferred embodiment according to accompanying drawing.

Description of drawings

Fig. 1 is the circuit diagram of conventional fan;

Fig. 2 is a conventional fan motor characteristics plotted curve;

Fig. 3 is the circuit box schematic representation of preferred embodiment of the present invention;

Fig. 4 is the circuit diagram of preferred embodiment of the present invention;

Fig. 5 is the fan motor characteristic curve schematic representation of preferred embodiment of the present invention.

Description of reference numerals: 11 motors; 111 first coil winding; 112 second coil winding; 12 driver elements; 121 driven units; 1,211 first output connecting pins; 1,212 second output connecting pins; 122 Hall subassemblies; 21 input units; 211 diodes; 22 comparing units; 221 comparators; 2211 normal phase input ends; 2212 inverting inputs; 2213 output terminals; 222 resistors; 223 stabipacks; 224 resistors; 225 resistors; 226 capacitors; 227 resistors; 228 stabipacks; 23 control units; 231 control units; 232 Hall subassemblies; 24 output units; 241 first motor coil windings; 242 second motor coil windings; OUT1 first output connecting pin; OUT2 second output connecting pin.

Embodiment

See also the circuit block diagram of preferred embodiment of the present invention shown in Figure 2, control circuit of the present invention comprises at least: an output unit 24; One control unit 23 connects this output unit 24, controls this output unit 24 and drives; One comparing unit 22 connects this control unit 23, controls the output current of this control unit 23; One input unit 21 connects control unit 23 and comparing unit 22, and for the input of input power supply.

Please consult the circuit diagram of Fig. 3, preferred embodiment of the present invention shown in Figure 4 again, this output unit 24 includes one first motor coil winding 241 at least, and one second motor coil winding 242; This control unit 23 includes a control unit 231 and a Hall subassembly 232 at least, this Hall subassembly 232 detects the pole change of the rotor of this output unit 24, produce positive voltage H+ and negative voltage H-output, the corresponding IN+ pin and the IN-pin that connect this control unit 231 respectively, the first output connecting pin OUT1 of this control unit 231 connects above-mentioned this first motor coil winding 241, and above-mentioned this second motor coil winding 242 of this second output connecting pin OUT2 connection, use these output unit 24 running starts of controlling and driving.

Described comparing unit 22 includes a comparator 221 (exclusive disjunction amplifier) at least, this comparator 221 has a normal phase input end 2211, an inverting input 2212 and an output terminal 2213, wherein this output terminal 2213 connects the VTH pin of control unit 231, and between output terminal 2213 and VTH pin, be connected with a resistor 222 and a stabipack 223, one end of this resistor 222 is for the DC electrical source input, the other end connects this output terminal 2213, these stabipack 223 1 end ground connection, the other end connects this output terminal 2213; This normal phase input end 2211 connects a resistor 224, a resistor 225 and a capacitor 226, wherein these resistor 224 1 ends are for direct current power supply input, the other end connects normal phase input end 2211, these resistor 225 1 end ground connection, the other end connects normal phase input end 2211, these capacitor 226 1 end ground connection, the other end connects normal phase input end 2211; And this inverting input 2212 connects a resistor 227 and a stabipack 228, and wherein these resistor 227 1 ends are bestowed DC electrical source, and the other end connects inverting input 2212, these stabipack 228 1 end ground connection, another termination inverting input 2212; That is, the inverting input 2212 of this comparator 221 is accepted the voltage division signal that aforementioned resistor 227 and stabipack 228 are formed; And this above-mentioned stabipack 223,228 can be Zener diode.

This input unit 21 is for an input power Vcc input, and it includes a contrary pressure protection diode 211, and connects comparing unit 22 and control unit 23, bestows its DC electrical source.

When power Vcc is imported via input unit 21; transfer to comparing unit 22 and control unit 23 through the contrary protection diode 211 of pressing; the resistance 224 of the normal phase input end 2211 of comparator 221 and resistance 225 produces voltage division signal and receives these voltage division signal and discharge and recharge through capacitor 226; voltage signal by normal phase input end 2211 inputs is changed between a rating value; when the signal of normal phase input end 2211 voltage division signal less than inverting input 2212; the output terminal 2213 of comparator 221 produces an inversion signal; when the VTH pin of control unit 231 received inversion signal, control unit 231 can not sent drive signal (being driving current) to output unit 24.

When the input signal of normal phase input end 2211 greater than inverting input 2212 voltage division signal, the output terminal 2213 of comparator 221 produces a positive phase signals, the positive difference of the voltage division signal of the input signal of normal phase input end 2211 and inverting input 2212 is big, be that the fan motor high pressure activates, this output positive voltage of signals value is big, resistor 222 and stabipack 223 dividing potential drop effects via output terminal 2213, these stabipack 223 stable these positive phase signals are in fixed voltage value, when the reception of the VTH of control unit 231 pin position has positive phase signals, can output one drive signal (being driving current) export first coil winding 241 and second coil winding 242 respectively to, order about output unit 24 high speed rotating by the first output connecting pin OUT1 and the second output connecting pin OUT2.

When the positive difference of the voltage division signal of the input voltage signal of normal phase input end 2211 and inverting input 2212 little, be that fan motor pressure drop to low pressure is rotated, this output positive voltage of signals value is little, via resistor 222 and stabipack 223 dividing potential drop effects, these stabipack 223 stable these positive phase signals are fixed voltage value as hereinbefore, when the reception of the VTH of control unit 231 pin position has positive phase signals, the control unit 231 first output connecting pin OUT1 and the second output connecting pin OUT2 output current to the first motor coil winding 241 and the second motor coil winding 242 respectively, make output unit 24 keep identical speed and rotate.

As Fig. 4, shown in Figure 5, promptly for example rotate and fan motor output HIGH voltage 12 volts (volt) when activating when embodiment's fan motor output LOW voltage 4 volts (volt), comparing unit 22 produces the pin position of an identical fixing positive phase signals to the VTH of control unit 231, make output current by the first output pin position OUT1 of control unit 231 and the second output pin position OUT2 at different magnitude of voltage, be that high voltage has identical output value during with low voltage, and then the rotating speed of output unit 24 maintains identical 2300 rev/mins of rotating speeds (rpm), improve known techniques at the high tachometer value of output LOW voltage, output HIGH voltage activates and to cause the control unit load excessive and produce and burn phenomenon and take place, and has the characteristic that radiating efficiency promotes when reducing power supply waste and low voltage running.

The above only is preferable feasible embodiment of the present invention, and the variation that utilizes said method of the present invention, shape, structure, device to do such as all should belong to protection scope of the present invention.

Claims

1, a kind of DC fan high pressure activates the control circuit of the high rotation speed operation of low pressure, comprising:

One output unit;

One control unit connects output unit, controls this output unit and drives;

One comparing unit connects control unit, controls the output current of this control unit;

One input unit connects control unit and comparing unit, and for the input of input power supply.

2, DC fan high pressure as claimed in claim 1 activates the control circuit of the high rotation speed operation of low pressure, and wherein, output unit comprises the motor coil winding.

3, DC fan high pressure as claimed in claim 1 activates the control circuit of the high rotation speed operation of low pressure, and wherein, control unit comprises a control unit and a Hall subassembly.

4, DC fan high pressure as claimed in claim 1 activates the control circuit of the high rotation speed operation of low pressure, and wherein, this comparing unit comprises a comparator.

5, DC fan high pressure as claimed in claim 4 activates the control circuit of the high rotation speed operation of low pressure, and wherein, comparator comprises a positive input.

6, DC fan high pressure as claimed in claim 4 activates the control circuit of the high rotation speed operation of low pressure, and wherein, comparator comprises a reverse input end.

7, DC fan high pressure as claimed in claim 6 activates the control circuit of the high rotation speed operation of low pressure, and wherein, the reverse input end of comparator connects at least one stabipack.

8, DC fan high pressure as claimed in claim 4 activates the control circuit of the high rotation speed operation of low pressure, and wherein, this comparator has an output terminal.

9, DC fan high pressure as claimed in claim 8 activates the control circuit of the high rotation speed operation of low pressure, and wherein, the output terminal of this comparator connects at least one stabipack.

10, as the control circuit of claim 7 or the high rotation speed operation of 9 described DC fan high pressure activation low pressure, wherein, this stabipack is a Zener diode.