CN2045510U

CN2045510U - Isolated dc voltage stabilizing and output device

Info

Publication number: CN2045510U
Application number: CN 88215368
Authority: CN
Inventors: 宋维纲
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-27
Filing date: 1988-10-27
Publication date: 1989-10-04

Abstract

The utility model provides an isolated DC voltage stabilizing and output device which is very suitable for the computer to normally work in vile environment. The isolated DC voltage stabilizing and output device is composed of an invert circuit, a rectifying filter circuit and a voltage stabilizing circuit. The invert circuit adopts a shared emission pot inverter circuit. The isolated DC voltage stabilizing and output device has the advantages of simple device, high efficiency and high reliability, the isolated DC voltage stabilizing and output device can output the stable direct current low voltage, and the input voltage and the output voltage is isolated reliably.

Description

Isolated DC voltage stabilizing and output device

The utility model relates to a kind of isolated power supply, particularly a kind of DC-isolation voltage stabilizing output unit.Be applicable to computing machine operate as normal in rugged surroundings.

Along with the continuous development of computer utility, its application enlarges day by day, in some special occasion, on motor vehicles such as automobile, tractor, because the power-supply fluctuation scope is big and interference, makes the truck-mounted computer cisco unity malfunction.In the prior art, general transformer can only be done to exchange and rise or step-down usefulness, even existing direct current → interchange → continuous-current convertor also constitutes high voltage output in the multiplication of voltage mode often, can not address this problem.And inverter circuit is complicated, and the components and parts of usefulness are more, and cost is higher.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of energy output stable dc low-voltage and the simple DC-isolation voltage stabilizing of circuit output unit.

The purpose of this utility model can reach by following measure: the utility model is made up of inverter circuit, current rectifying and wave filtering circuit, mu balanced circuit.The collector C of diode T1, T2 links to each other with 4,6 elementary ends of isolation tripping device K respectively in the inverter circuit, the base stage of T1 links to each other with 3 ends of K by resistance R 2, the base stage of T2 links to each other with 1 end of K by R1, the emitter-base bandgap grading of T1, T2 links to each other as voltage input anode, and connect an end of capacitor C 1, the end of R4,2 ends of K by R3,5 pin of another termination K of R4 and the other end of capacitor C 1, and as voltage input negative terminal, secondary 7, the 8 termination rectification circuits of K.

The purpose of this utility model can also reach by following measure: rectification circuit adopts way of full-wave rectification, and is connected to commutator tube A in addition.Mu balanced circuit uses three-terminal voltage-stabilizing pipe W to export as voltage stabilizing.

Figure＜one〉is a control principle block scheme of the present utility model;

Figure＜two〉is an electrical schematic diagram of the present utility model.

The utility model is described in further detail below in conjunction with (accompanying drawing) embodiment:

With reference to figure＜〉and figure＜two 〉, inverter circuit is made up of elementary winding (collector winding), feedback winding (base stage winding), resistance R 1, R2, R3, R4, the capacitor C 1 of triode T1, T2, transformer K.After input voltage vin was connected, the voltage on the resistance R 3 made the transistor base stage be in forward bias, (after inverter work, the self-deflection voltage of base current on R3 is opposite with this starting potential direction).Because the difference of two pipe characteristics, their collector current is unequal, thereby the ampere turns of two collector winding Wc is also unequal, and the result produces certain resultant flux φ in the heart in transformer fe, and the magnetic flux of this variation makes each winding produce induced potential.The end of the same name of supposing winding is shown in the figure direction, and the induced potential of then basic winding Wb1 is added to the T1 base stage and makes its conducting, and the induced potential of Wb2 ends T2.Because two pipe collector difference between currents increase, T1 is conducting more, and T2 ends more.Electric current among the collector winding Wc1 is made up of two parts, and wherein watt current is decided by the size of load, and it is a constant value in T1 conduction period; And magnetization current is decided by the magnetic flux in the transformer.Through behind the certain hour, when the magnetic flux value of reaching capacity in the transformer, inductance value just is reduced to zero, magnetization current sharply increases, collector current also sharply increases to maximal value in the transistor, at this moment current value in the collector winding or magnetic flux just no longer increase, and each winding induced potential descends, and base current and collector current and magnetic flux all begin to descend.The magnetic flux of this decline just induces the electromotive force with original opposite polarity on each winding, these electromotive forces end the pipe T1 of original conducting, originally the pipe T2 conducting that ended, because positive feedback process, T1 is ended fully, the T2 conducting has so far been finished the half period of vibration to state of saturation.Because the T2 conducting all adds on second winding Wc2 voltage Vin, so the magnetization current of winding and magnetic flux in like manner can be finished the conversion of half period just with the same half cycle reverse direction linear growth, resistance R 1, R2 make current limliting and use.

Current rectifying and wave filtering circuit is by full bridge rectifier Z, and 7,8 windings of commutation diode A, capacitor C 2, isolating transformer K are formed.Isolating transformer K plays isolation and imports and output voltage, and full-bridge type rectification circuit Z makes the interchange input become direct current and exports, and commutation diode A rises and stablizes three-terminal voltage-stabilizing pipe W input voltage usefulness.

Mu balanced circuit is made up of three-terminal voltage-stabilizing pipe W and capacitor C 3, and W is the main voltage stabilizing part of this device output.C2, C3 are jumbo electrochemical capacitors, play the electric weight compensating action.

The signal of being come by inverter circuit again through C3 and W, provides stable dc low-voltage after full-bridge rectification, C2 filtering.

The utility model has following advantage compared to existing technology:

1. dc low-voltage that can stable output, and input and output voltage are isolated reliably.

2. circuit is simple, volume is little, cost is low, efficient is high, dependable performance, is specially adapted to computer and works in adverse circumstances.

Claims

1, a kind of DC-isolation voltage stabilizing output unit, by current rectifying and wave filtering circuit 2, mu balanced circuit 3, shell is formed, it is characterized in that triode T1 in the inverter circuit 1, the collector C of T2 respectively with isolating transformer K elementary 4,6 ends link to each other, the base stage of T1 links to each other with 3 ends of K by resistance R 2, the base stage of T2 links to each other with 1 end of K by R1, T1, the emitter-base bandgap grading of T2 links to each other as voltage input anode, and connect an end of capacitor C 1 by R3, the end of R4 and 2 ends of K, 5 ends of another termination K of R4 and the other end of capacitor C 1, and as voltage input negative terminal, secondary 7 of K, 8 termination current rectifying and wave filtering circuits 2.

2, device according to claim 1 is characterized in that current rectifying and wave filtering circuit 2 adopts way of full-wave rectification, and is connected to commutator tube A in addition.

3, device according to claim 1 is characterized in that mu balanced circuit 3 uses three-terminal voltage-stabilizing pipe W to export as voltage stabilizing.