CN2419401Y

CN2419401Y - Controller for controlling rotation speed of electric fan by temperature

Info

Publication number: CN2419401Y
Application number: CN 00234364
Authority: CN
Inventors: 古金龙
Original assignee: DALONG INDUSTRY Co Ltd TAIWEN PROV
Current assignee: DALONG INDUSTRY Co Ltd TAIWEN PROV
Priority date: 2000-05-12
Filing date: 2000-05-12
Publication date: 2001-02-14
Anticipated expiration: 2010-05-12

Abstract

The utility model relates to a controller for controlling the rotation speed of an electric fan by temperature, comprising a motor driving circuit, a temperature detecting element control circuit, a power control circuit and a voltage regulator circuit; the temperature detecting element control circuit is connected with a temperature detecting circuit, and the control circuit takes action depending on the resistance change of the temperature detecting element; the power control circuit is connected with the output terminal of the control circuit, the output terminal of the power control circuit is connected with the motor driving circuit, and the power control circuit takes action when the control circuit is conducted; the voltage regulator circuit is connected with the power control circuit and provides power for an electric fan motor in low speed operation. The utility model has the advantages that a favorable linear characteristic can be obtained, the volume of the device is decreased, etc.

Description

Control gear with temperature control electric fan rotating speed

The utility model relates to a kind of temperature controlled electric fan revolution speed control device that has, and particularly relates to a kind of rotating speed of electric fan motor and electric fan revolution speed control device that the characteristic between the voltage remains on linear relationship of making.

In the prior art, the alignment circuit that changes the electric fan motor rotary speed generally is to adopt pulse width modulation (PWM) (Pulse Width Modulation) to change motor rotary speed, for example, Taiwan patent announcement number: 0327486, " brush DC fan Wave-wide regulation controlled electric circuit "; Taiwan patent announcement number: 0152582, " Wave-wide regulation controlled electric speed control formula brush DC radiation fan "; Taiwan patent announcement number: 0146147 disclosed PWM control techniques such as " controls of alternating current motor continuous variable speed Pulse wave width modulation ".

But the PWM control gear of prior art exists many, the increase manufacture cost of big, the peripheral part in addition of volume, and the linearization of performance characteristic is poor.

For this reason, the applicant, designs a kind of rotating speed of heat radiation motor fan that makes and can keep linear circuit control device with respect to voltage through concentrating on studies for many years in conjunction with control theory.

A purpose of the present utility model provides a kind of rotating speed of heat radiation motor fan that makes can keep linear circuit control device with respect to voltage.

Another purpose of the present utility model provides the temperature controlled electric fan that a kind of volume is little, circuit is simple, performance characteristic is good and with low cost.

Above-mentioned purpose of the present utility model is to realize by the device for controlling motor rotational speed of being made up of temperature detection part, control circuit, power control circuit, mu balanced circuit, load circuit and drive circuit.

Below by consulting in conjunction with the description of each accompanying drawing to preferred embodiment of the present utility model, the professional and technical personnel can have more deep understanding to the utility model.Wherein each accompanying drawing is:

Fig. 1 is an an embodiment's of the present utility model circuit block diagram;

Fig. 2 is an an embodiment's of the present utility model circuit diagram;

Fig. 3 is the plotted curve that concerns between expression electric fan motor rotary speed of the present utility model and the temperature variation;

Fig. 4 is an improved circuit skeleton diagram of the present utility model;

Fig. 5 is follow-on circuit diagram of the present utility model.

Next, with reference to each accompanying drawing preferred embodiment of the present utility model is described.

At first see figures.1.and.2 and describe first embodiment of the present utility model, Fig. 1 and Fig. 2 are respectively circuit block diagram of the present utility model and circuit diagram.In Fig. 1, on behalf of control circuit, label 3, label 1 representation temperature Detecting element, label 2 represent power control circuit, label 4 to represent load circuit, label 5 to represent mu balanced circuit and label 6 to represent drive circuit.

Temperature detection element 1 is a thermistor (NTC), and its resistance is with the temperature variation that is inversely proportional to, that is: temperature rises, and resistance diminishes; It is big that temperature decline resistance becomes.

Temperature detection element 1 links to each other with the input end of control circuit 2, and this control circuit is made up of transistor Q1 and biasing resistor R2, R3.This control circuit 2 is moved by the change in resistance of temperature detection element 1, promptly when the resistance of temperature rising, temperature detection element 1 reduces, make the voltage at resistance R 3 two ends greater than the voltage at the base-emitter two ends of transistor Q1, thereby make transistor Q1 be on state.Otherwise transistor Q1 is in not on-state.

The input end of power control circuit 3 links to each other with the collector electrode of the transistor Q1 of control circuit 2, and this power control circuit is made up of power Vcc, transistor Q2, resistance R 4.The transistor Q2 of power control circuit 3 moves when transistor Q1 is switched on.

Mu balanced circuit 5 is connected the collector electrode of the transistor Q2 of power control circuit 3, and this mu balanced circuit 5 is made up of Q3, resistance R 5, Zener diode ZD1.

This mu balanced circuit 5 provides the power supply of electric fan motor when low-speed running, that is to say that when transistor Q2 was not on-state, the voltage of this Zener diode ZD1 was greater than the voltage between the base-emitter of transistor Q3, make transistor Q3 conducting, thereby remain on low potential.

Load circuit 4 is connected on the emitter of transistor Q3 of the collector electrode of transistor Q2 of power control circuit 3 and mu balanced circuit 5, and load circuit 4 is made up of the winding inductance L1 of electric fan motor and L2.The output of load circuit 4 be connected by elements such as intergrated circuit U1, U2, capacitor C 1, C2 form drive circuit 6.Wherein intergrated circuit U1 is a two-phase unisexuality direct current electric fan motor driver, and for example can adopt marque is the driver of LB1967M and so on; Intergrated circuit U2 is the high sensitivity Hall element, and for example can adopt marque is the Hall element of HW-101A.

This load circuit 4 is to be subjected to the voltage drive of power control circuit 3 or mu balanced circuit 5 outputs to carry out work.

Referring now to Fig. 3, this figure is the rotating speed of explanation electric fan motor of the present utility model and the characteristic curve between the temperature variation, and wherein transverse axis is represented temperature (T), and the longitudinal axis is represented rotating speed (rpm).Particularly, when temperature during 0-T1, the resistance of temperature detection element 1 increases, cause transistor Q1 to end, make not conducting of Q2, at this moment, transistor Q3 conducting makes the emitter of transistor Q3 remain on low potential always, so winding L 1, L2 are subjected to the excitation of low potential.Thereby make the electric fan motor rotary speed maintain the slow-speed of revolution (r1) running.

When temperature rose (T1-T2), the resistance of temperature detection element 1 reduced, and makes transistor Q1 conducting, make the collector potential of transistor Q1 descend, thereby make transistor Q2 conducting, thereby the electric fan motor is turned round (r1-r2) according to the collector potential variation of Q2, and keep linear.

When temperature rises to certain value (T2), cause the collector electrode of transistor Q2 to remain on maximum potential, this moment, the electric fan motor rotary speed maintained certain value (r2) running.

Below with reference to Fig. 4 and Fig. 5, they are improved circuit skeleton diagram of the present utility model and circuit diagram.The circuit square frame of the circuit square frame of Fig. 4 and Fig. 5 and formation fundamental sum Fig. 1 of circuit diagram and Fig. 2 is the same substantially with the formation of circuit diagram; dimension one difference is can be connected a protecting component (diode) 7 between load circuit 4 and the mu balanced circuit 5, is burnt with the transistor Q3 that prevents mu balanced circuit 5.

In sum, by the design of voltage adjustment type of the present utility model, make to have following characteristics:

(1) can obtain the characteristic of good linear;

(2) reduce the volume of device;

It is (3) peripheral that part is few in addition;

(4) reduce cost.

At last, embodiment of the present utility model described above only is illustrative, rather than restrictive.The professional and technical personnel is under the situation that does not break away from spirit and scope of the present utility model, and still various modifications and changes may be made.Therefore, the scope that contains various modifications and variations of the present utility model is determined by following claims.

Claims

1. the control gear of temperature control electric fan rotating speed is characterized in that comprising:

Motor drive circuit, this circuit is subjected to voltage drive and operates;

Temperature detection element, this element are the thermistor that its resistance and temperature variation are inversely proportional to;

Control circuit is connected with temperature sensing circuit, and this control circuit is to be subjected to the change in resistance of temperature detection element and to move;

Power control circuit is connected to the output terminal of control circuit, and the output terminal of this power control circuit is connected to motor drive circuit, and this power control circuit is when control circuit is switched on and move; And

Mu balanced circuit is connected power control circuit, and the power supply of electric fan motor when low-speed running is provided.

2. according to the control gear of the temperature of claim 1 control electric fan rotating speed, it is characterized in that: be connected a protecting component between load circuit and the mu balanced circuit.

3. control the control gear of electric fan rotating speed according to the temperature of claim 2, it is characterized in that: it is characterized in that above-mentioned protecting component is a diode.