CN2757400Y

CN2757400Y - Power module special for automobile

Info

Publication number: CN2757400Y
Application number: CN 200420012916
Authority: CN
Inventors: 白玉民; 侯延东
Original assignee: FAW QIMING INFORMATION TECHNOLOGY Co Ltd
Current assignee: FAW QIMING INFORMATION TECHNOLOGY Co Ltd
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-02-08
Anticipated expiration: 2014-12-29

Abstract

The utility model relates to a special power module for an automobile. The front end of a main conversion circuit is provided with an electronic switching tube, an over-voltage detecting device, an under-voltage detecting device and a counter-voltage breaking circuit; an inverted diode is connected with an emitting electrode of an electronic switch; a voltage stabilizing tube and a resistor are connected with a base electrode of a triode in series and bridged between a base electrode of the electronic switching tube K and the emitting electrode. A diode and the resistor which are connected in series are connected with the base electrode of the triode; a voltage input terminal of the main conversion circuit is connected with a collecting electrode of the electronic switch K, and an output terminal of the main conversion circuit is connected with load. The utility model ensures that when the power module encounters inverse voltage at the input terminal or voltage is higher than rated value, an input circuit can be quickly switched off so that the conversion circuit can be protected from influence, the power section can lie in a safe working region, and an automobile-mounted device on the automobile can work reliably and not be damaged. The utility model has the characteristics of simple structure, convenient use, reliable working, low cost, etc. and can be completely suitable for the requirement of an electric device of an automobile power-supply bus.

Description

The automobile specified power module

Technical field:

The utility model relates to a kind of car-mounted electronic device specialized voltages translation circuit, further will be to disclose a kind of automobile specified power module, for car electrics provide various required voltages, the various adverse circumstances that especially can adapt to the automobile power source bus belong to automobile-use supply unit technical field.

Background technology:

At present, the working voltage of car-mounted electronic device often is not the nominal voltage of automobile, need carry out conversion.Conventional transform method is to adopt the mode of linear adjustment or high frequency conversion that voltage is adjusted to required voltage; such translation circuit can't satisfy the application on the automobile strictly; because power supply is the state that is operated in more complicated on the car; although nominal is 12 volts or 24 volts; but be subjected to the influence of various electrical equipment composite factors on the power bus; produce higher forward voltage or reverse impulse through regular meeting; perhaps voltage is lower than the minimum operating voltage of system's defined; make using electricity system get muddled (as embedded computer system etc.) or permanent damage, also do not have special automobile electrical source module to occur at present.

Summary of the invention:

The utility model discloses a kind of automobile specified power module, can satisfy the application of 12 volts or 24 volts power supply vehicles, has the specific function of 200 volts of overvoltage protections of forward, reverse 1500 volts of protections, under-voltage protection.Solved the problem that existing power module can not adapt to the power supply adverse circumstances.

Technical scheme:

The technical scheme that the utility model adopted is: change the IC circuit front end at typical main transformer and be provided with electronic switching tube; overvoltage detects protective circuit; under-voltage detection control circuit; the back-pressure blocking circuit; wherein; the backward diode D of back-pressure blocking circuit connects the emitter of electronic switch K; suppress the reverse voltage input; voltage-stabiliser tube D1; the base stage of resistance R 1 serial connection triode BG1 constitutes overvoltage and detects protective circuit; be connected across between the base stage and emitter of electronic switching tube K; the control action that realization is switched on or switched off to electronic switch; voltage stabilizing didoe D2; the base stage of resistance R 2 series connection triode BG2 constitutes overvoltage/undervoltage and detects control circuit; the collector electrode of BG2 connects the output control terminal that main transformer changes circuit; the voltage input end that main transformer changes circuit connects the collector electrode of electronic switch K, its output termination load.

The overvoltage control circuit turn-offs electronic switch when input voltage is higher than set point, and main transformer changes circuit does not have operating voltage, quits work; When input voltage was lower than set point, electronic switch was open-minded, and the BG2 in the under-voltage circuit ends, and it is high level that main transformer changes the circuit control signal input, and main transformer changes circuit output and is turned off; When input voltage is between the setting district, the electronic switch conducting, it is low level that main transformer changes the circuit control signal input, main transformer changes circuit and produces normal voltage output.

The application of power module does not have specific (special) requirements, only needs the negative pole with public termination power, input termination positive source, and output termination electrical appliance can use.

Good effect of the present utility model is: vehicle power installs overvoltage crowbar, reverse voltage buffer circuit and under-voltage protecting circuit additional; guaranteed power module input meet reverse voltage or voltage is higher than, when being lower than rated value; can turn-off input circuit rapidly; the protection translation circuit is unaffected; make power unit be in safe operation interval; the assurance car-mounted device is worked on automobile reliably, is not compromised.Have simple in structure, easy to use, reliable operation, characteristics such as with low cost, can adapt to the requirement of automobile power source bus power consumption equipment fully.

Description of drawings:

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

Embodiment:

According to shown in Figure 1, the utility model changes circuit by electronic switching tube, overvoltage detection protective circuit, under-voltage detection control circuit, back-pressure blocking circuit and main transformer and constitutes; Wherein (referring to Fig. 2), main transformer changes IC circuit and is conventional switch mode power translation circuit, type selecting is the LM2576T model, electronic switch K is the V-MOS power field effect pipe of P raceway groove, backward diode D connects the emitter of electronic switch K, suppress the reverse voltage input, the back-pressure blocking-up guarantees can not deliver to electronic switch to back-pressure; Just often voltage is delivered to the electronic switch of back, and electronic switch is the switching device (0.03 ohm of conducting resistance) of extremely low conducting internal resistance, and response speed is exceedingly fast, and only is nanosecond.The base stage of voltage-stabiliser tube D1, resistance R 1 serial connection triode BG1 constitutes overvoltage and detects protective circuit; be connected across between the base stage and emitter of electronic switching tube K; the control action that realization is switched on or switched off to electronic switch; the base stage of voltage stabilizing didoe D2, resistance R 2 series connection triode BG2 constitutes overvoltage/undervoltage and detects control circuit; the collector electrode of BG2 connects the output control terminal that main transformer changes circuit; the voltage input end that main transformer changes circuit connects the collector electrode of electronic switch K, its output termination load.Electronic switch is controlled by overvoltage and detects, and when set point voltage appearred being higher than in the voltage on the power line, electronic switch turn-offed rapidly, and when set point voltage appearred being lower than in the voltage on the power line, main transformer changed circuit and is turned off, and the protection main transformer changes circuit and is not damaged.

Claims

1; a kind of automobile specified power module; it is characterized in that: change the IC circuit front end at main transformer and be provided with electronic switching tube; overvoltage detects protective circuit; under-voltage detection control circuit; the back-pressure blocking circuit; wherein; the backward diode D of back-pressure blocking circuit connects the emitter of electronic switch K; voltage-stabiliser tube D1; the base stage of resistance R 1 serial connection triode BG1 constitutes overvoltage and detects protective circuit; be connected across between the base stage and emitter of electronic switching tube K; voltage stabilizing didoe D2; the base stage of resistance R 2 series connection triode BG2 constitutes overvoltage/undervoltage and detects control circuit; the collector electrode of BG2 connects the output control terminal that main transformer changes circuit; the voltage input end that main transformer changes circuit connects the collector electrode of electronic switch K, its output termination load.