CN2671197Y

CN2671197Y - D.C. motor protective circuit

Info

Publication number: CN2671197Y
Application number: CN 200320116723
Authority: CN
Inventors: 王为彬
Original assignee: DINGPEI Co Ltd
Current assignee: DINGPEI Co Ltd
Priority date: 2003-11-14
Filing date: 2003-11-14
Publication date: 2005-01-12
Anticipated expiration: 2013-11-14

Abstract

The utility model relates to a d. c. motor protective circuit which can prevent the circuit and the motor from being damaged through the protecting component in the circuit when the power source is in reverse connection and also can ameliorate the condition that the rotational speed of the motor descends because the operating voltage decreases. The utility model comprises: a direct current power supply, a direct current motor, a drive circuit connected with the direct current motor to drive the action of the direct current motor, a protecting component connected between the direct current power supply and the drive circuit to protect the drive circuit and the direct current motor.

Description

The d.c. motor protective circuit

Technical field

The utility model relates to a kind of d.c. motor protective circuit, particularly relates to a kind of protective circuit that causes drive circuit or d.c. motor to burn when preventing the power supply reversal connection that is provided with.

Background technology

Along with the power of the each component of computer height that edges up more, its caloric value is also increasing.In this respect, the most outstanding with CPU.When the CPU transistor size from the hundreds of thousands in 386 epoch, when developing into more than 5,000 ten thousand of current P4 epoch, its common CPU surface temperature can reach 50-80 ℃.CPU inside is then gone up Baidu even up to 80 especially, and CPU is also just more and more higher to the requirement of heat radiation like this.PC World is born and various heat dissipation equipments thus, central the most general be exactly the wind-cooling heat dissipating method.Radiator fan has caused the concern of people to it as one of critical component of air-cooled radiator.

The motor technology of fan is one of technology of most critical in the fan.According to the kind of fan electromotor, can be divided into once-through type fan and AC type fan two classes to fan.The majority of using on the computer is a DC fan now; and DC fan non-carbonate d.c. motor and the non-carbonate d.c. motors of using are to drive flabellum with the magnetic field that inner control circuit changes to rotate more; rotating speed changes with the height of operating voltage; see also Fig. 1; Fig. 1 is known non-carbonate d.c. motor protective circuit calcspar; wherein the employed protection assembly 24 of circuit is a rectifier diode; it is serially connected with between DC power supply 22 and the drive circuit 26; and drive circuit is made up of drive IC 261 and Hall subassembly 262; and characteristic that can be by rectifier diode when the voltage source reversal connection during at revers voltage with circuit by (OFF); in order to protection when DC power supply 22 reversal connections the infringement of the circuit that causes and non-carbonate d.c. motor; but in operate as normal; circuit voltage as the known non-carbonate d.c. motor protective circuit of Fig. 2 distributes shown in the calcspar; itself have about 0.7 volt voltage drop during the rectifier diode conducting; if use the voltage source of 5 volts of voltages to drive; then in fact; 26 of drive circuits have used 4.3 volts voltage; and the voltage minimizing will make d.c. motor 28 rotating speeds descend, and make the radiating efficiency of fan integral body reduce.

Summary of the invention

Main purpose of the present utility model; be to provide a kind of d.c. motor protective circuit; has the protection assembly that causes circuit and motor infringement when preventing the power supply reversal connection; and should protection assembly circuit forward during conducting the voltage drop of itself much smaller than traditional protection assembly; therefore can significantly improve motor rotary speed and reduce the situation that descends, and improve the radiating efficiency of fan because of voltage.

In order to achieve the above object, the utility model provides a kind of d.c. motor protective circuit, comprising: a direct current power supply; One direct current motor; One drive circuit is connected in this d.c. motor, in order to drive this d.c. motor action; One protection assembly is connected between this DC power supply and this drive circuit, in order to protect this drive circuit and this d.c. motor.Thus; this protection assembly is used for protective circuit and motor when the DC power supply reversal connection; and when the operate as normal conducting; the voltage drop of this protection assembly itself is much smaller than known protection assembly; make drive circuit that higher voltage be arranged; reduce the situation that descends so can significantly improve motor rotary speed because of voltage, and improve the radiating efficiency of fan.

In order to enable further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet appended graphic only provide with reference to and the explanation usefulness, be not to be used for the utility model is limited.

Description of drawings

Fig. 1 is known non-carbonate d.c. motor protective circuit calcspar;

Fig. 2 is that the circuit voltage of known non-carbonate d.c. motor protective circuit distributes calcspar;

Fig. 3 is the non-carbonate d.c. motor protective circuit of a utility model calcspar; And

Fig. 4 is that the circuit voltage of the non-carbonate d.c. motor protective circuit of the utility model distributes calcspar.

Embodiment

Fig. 3 is non-carbonate d.c. motor protective circuit 10 calcspars of the utility model; be used in the protection of radiator fan drive circuit 16 and d.c. motor 18; comprising: DC power supply 12, d.c. motor 18, drive circuit 16 and protection assembly 14; this d.c. motor is a non-carbonate d.c. motor in above-mentioned, and this protection assembly 14 is a Schottky diode.

Continue to consult Fig. 3; wherein this drive circuit 16 comprises that also drive IC 161 connects a Hall subassembly 162; this drive IC 161 is connected to the induction coil of d.c. motor 18 inside; induce the change of d.c. motor 18 internal magnetic fields via Hall subassembly 162; and produce high respectively; the signal of electronegative potential; in order to the action of controlling and driving IC161 and and then drive d.c. motor 18 runnings; wherein also can be connected in series a resistor R between Hall subassembly 162 and the reference potential 19; characteristic by resistor R can limit the electric current that flows through Hall subassembly 162, in order to protection when electric current is excessive and cause the infringement of Hall subassembly 162.

Please continue to consult Fig. 3; required electric energy when wherein DC power supply 12 provides the action of whole protecting circuit and d.c. motor; be connected in series protection assembly 14 between this DC power supply 12 and the drive circuit 16; in order to when DC power supply 12 reversal connections with circuit by (OFF); make drive circuit 16 and d.c. motor 18 be unlikely to cause extensive damage; and can and meet a capacitor C between drive circuit 16 and protection assembly 14; cause drive circuit 16 to bear and burn in order to open (ON) moment when DC power supply 12, to avoid in circuit the surge voltage that is caused.

Please continue to consult Fig. 3; wherein this protection assembly 14 is a Schottky diode; because the forward conducting bias voltage of Schottky diode is generally 0.2 volt; much smaller than 0.7 volt of known rectifier diode; so can reduce the phenomenon that causes d.c. motor 18 rotating speeds to descend because of diode biasing; and the running efficiency of raising d.c. motor 18, to reach the function of protection, minimizing rotation speed change and raising fan radiating efficiency.

See also Fig. 2; it is the circuit voltage distribution calcspar of known non-carbonate d.c. motor protective circuit; wherein DC power supply 22 is 5 volt DC power supplys; protection assembly 24 conductings when the circuit regular event; this protection assembly 24 is a rectifier diode; its two ends pressure drop is 0.7 volt during general rectifier diode conducting, and the operating voltage that therefore is fed to drive circuit 26 has only 4.3 volts, and the rotating speed that can cause d.c. motor 28 this moment reduces and influences the radiating efficiency of fan.

See also Fig. 4; it is the circuit voltage distribution calcspar of the non-carbonate d.c. motor protective circuit of the utility model; wherein DC power supply 12 is 5 volt DC power supplys; protection assembly 14 conductings when the circuit regular event; this protection assembly 14 is a Schottky diode; its two ends pressure drop is 0.2 volt during general Schottky diode conducting; therefore the operating voltage that is fed to drive circuit 16 is 4.8 volts, and the situation that therefore can obviously improve rotating speed decline is to reach the function of protection, minimizing rotation speed change and raising fan radiating efficiency.

As mentioned above; the utility model can provide protection assembly 14; in order to the drive circuit that reversal connection caused 16 that prevents direct voltage 12 and the infringement of d.c. motor 18; and can be by the minimum forward conducting bias voltage of these protection assembly 14 Schottky diodes; make DC power supply 12 supply higher voltage give drive circuit 16, and increase the running ability of d.c. motor 18 and then the radiating efficiency of raising fan.

But the above; it only is the detailed description of specific embodiment of one of the utility model the best and graphic; all closing in the embodiment of the spirit variation similar of the utility model claims with it; all should be contained in the category of the present utility model; any those of ordinary skill of being familiar with this technology in field of the present utility model, can think easily and variation or modify all can be encompassed within claims of the present utility model scope required for protection.

Claims

1. d.c. motor protective circuit is characterized in that comprising:

One direct current power supply;

One direct current motor;

One drives the drive circuit of this d.c. motor action, is connected in this d.c. motor; And

One in order to protect the protection assembly of this drive circuit and this d.c. motor, is connected between this DC power supply and this drive circuit.

2. d.c. motor protective circuit as claimed in claim 1 is characterized in that this d.c. motor is a non-carbonate d.c. motor.

3. d.c. motor protective circuit as claimed in claim 1 is characterized in that this drive circuit comprises:

One drives the drive IC of this d.c. motor running; And

One cooperates this drive IC in order to control the Hall subassembly of this d.c. motor running, is connected in this drive IC.

4. d.c. motor protective circuit as claimed in claim 3 is characterized in that also having one in order to make the resistor of this Hall subassembly of current-limiting protection, is connected between this Hall subassembly and the reference potential.

5. d.c. motor protective circuit as claimed in claim 1 is characterized in that this protection assembly is a Schottky diode.

6. d.c. motor protective circuit as claimed in claim 1 is characterized in that also having one in order to protect the capacitor of the abrupt voltage wave phenomenon that this drive circuit caused when this DC power supply is opened, and is connected between this protection assembly and this drive circuit.