CN202737766U

CN202737766U - Large power adjustable direct current voltage stabilization power supply

Info

Publication number: CN202737766U
Application number: CN 201220363907
Authority: CN
Inventors: 刘喆
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-25
Filing date: 2012-07-25
Publication date: 2013-02-13
Anticipated expiration: 2022-07-25

Abstract

The utility model discloses a large power adjustable direct current voltage stabilization power supply. The large power adjustable direct current voltage stabilization power supply comprises a 220V alternating current, an alternating step-down transformer, a full bridge rectification circuit, a sampling circuit, a sampling signal amplification and current limiting protection circuit and a voltage division circuit and is characterized in that a compensating tube VT1 in the sampling signal amplification and current limiting protection circuit employs an enhancement N-channel large power field-effect tube, and the model is 2SK790. A compensating tube in a large power series-connection adjustable voltage stabilization power supply in the prior art commonly employs a large power NPN type transistor or a PNP type transistor which have a disadvantage of quite large power consumption of the compensating tube, so conversion efficiency of the power supply is quite low. The large power adjustable direct current voltage stabilization power supply takes high-precision three-terminal adjustable shunting reference voltage source TL431 as a core, takes the enhancement N-channel large power field-effect tube as the compensating tube, so the direct current voltage stabilization power supply not only can output large current and adjustable voltage, but also has improved conversion efficiency and reliability.

Description

High-power adjustable D. C regulated

Technical field

The utility model belongs to electronics and power technique fields, is about a kind of high-power adjustable D. C regulated.

Background technology

High-power adjustable D. C regulated is the power-supply device of design of electronic circuits personnel or electronic leaning laboratory indispensability.Multiplex high-power NPN transistor or high-power PNP transistor are managed in the in the past adjustment in the high-power series connection adjustable stabilized voltage supply, its major defect is that the power loss of adjustment pipe is very large, cause the conversion efficiency of power supply very low, the stabilized voltage power supply that is not easy to make large electric current.

In order to solve or remedy on the market all shortcoming of these high-power adjustable stabilized voltage supplies existence, the high-power adjustable D. C regulated that the utility model uses reference voltage source to make, adopting high accuracy three end adjustable shunt reference voltage source TL431 is core, adopt enhancement mode N channel high power field effect transistor as adjusting pipe, this D.C. regulated power supply not only can be exported large electric current, output voltage is adjustable, and has increased substantially conversion efficiency and the reliability of power supply.

Below describe high-power adjustable D. C regulated described in the utility model related relevant technologies content in implementation process in detail.

The utility model content

Goal of the invention and beneficial effect: multiplex high-power NPN transistor or PNP transistor are managed in the in the past adjustment in the high-power series connection adjustable stabilized voltage supply, its major defect is that the power loss of adjustment pipe is very large, cause the efficient of power supply conversion very low, the stabilized voltage power supply that is not easy to make large electric current.

In order to solve or remedy on the market all shortcoming of some high-power adjustable stabilized voltage supply existence, the high-power adjustable D. C regulated that the utility model uses reference voltage source to make, adopting high accuracy three end adjustable shunt reference voltage source TL431 is core, adopt enhancement mode N channel high power field effect transistor as adjusting pipe, this D.C. regulated power supply not only can be exported large electric current, output voltage is adjustable, and has increased substantially conversion efficiency and the reliability of power supply.

The circuit working principle: high-power adjustable D. C regulated passes through the 220V alternating current through transformer B step-down, full bridge rectifier QZ, electrochemical capacitor C3 filtering; form bleeder circuit by potentiometer RP and resistance R 1; form sampling amplification circuit by three end adjustable shunt reference voltage source IC1, resistance R 3; NPN type triode VT2, sample resistance R2 form current-limiting protection circuit; adjusting pipe VT1 is enhancement mode N channel high power field effect transistor; the voltage stabilizing output current can reach 6A, and electrochemical capacitor C1 is the voltage stabilizing output filter circuit.

Technical scheme: high-power adjustable D. C regulated, it is comprised of 220V alternating current, ac buck transformer, full bridge rectifier, sample circuit, sampled signal adjustment amplification and current-limiting protection circuit, bleeder circuit, and its feature comprises:

Full bridge rectifier: the two ends of AC transformer B secondary coil L2 connect respectively the alternating current input of full-bridge rectification element QZ, the cathode output end of full-bridge rectification element QZ connects the positive pole of electrochemical capacitor C3, the cathode output end of full-bridge rectification element QZ links to each other with the negative pole of electrochemical capacitor C3 and circuit ground GND, the two termination 220V alternating currents of AC transformer B primary coil L1;

Sample circuit: formed by three end adjustable shunt reference voltage source IC1 and resistance R 3, the positive pole of one termination electrochemical capacitor C3 of resistance R 3, the negative pole end of another termination three end adjustable shunt reference voltage source IC1 of resistance R 3 and the grid of adjusting pipe VT1, the positive terminal connection circuit ground GND of three end adjustable shunt reference voltage source IC1;

Sampled signal adjustment amplification and current-limiting protection circuit: by NPN type triode VT2, current sampling resistor R2 and adjustment pipe VT1 form, adjust pipe VT1 and adopt enhancement mode N channel high power field effect transistor, the model of selecting is 2SK790, the drain electrode of adjusting pipe VT1 connects the cathode output end of full-bridge rectification element QZ, the base stage of NPN type triode VT2 connects the source electrode of adjustment pipe VT1 and the end of current sampling resistor R2, the collector electrode of NPN type triode VT2 connects the grid of adjusting pipe VT1, the emitter of NPN type triode VT2, the other end of current sampling resistor R2 links to each other with the anodal VCC of output end of pressure-stabilizing;

Bleeder circuit: formed by potentiometer RP and divider resistance R1, the anodal VCC of the termination output end of pressure-stabilizing of potentiometer RP, the reference edge of the anodal and three end adjustable shunt reference voltage source IC1 of the end of another termination divider resistance R1 of potentiometer RP, electrochemical capacitor C2, the negative pole of the other end of divider resistance R1 and electrochemical capacitor C2 links to each other with circuit ground GND.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a high-power adjustable D. C regulated.

Embodiment

Implement according to the circuit working schematic diagram of high-power adjustable D. C regulated shown in the accompanying drawing 1 and the components and parts specification requirement of description of drawings and the following stated, can realize the utility model.

The selection of components and parts and technical parameter

QZ is the full-bridge rectification element, requires operating current 〉=10A, operating voltage 〉=100V;

IC1 is three end adjustable shunt reference voltage sources, model TL431, and packing forms T0-92,3 pin is respectively reference edge, positive terminal and negative pole end; Positive pole and negative pole two ends output voltage are adjustable continuously between 2.5～36V, and current margin is 0.1～100mA;

VT1 is enhancement mode N channel high power field effect transistor, and model is 2SK790, is encapsulated as T0-220;

VT2 is NPN type triode, selects the models such as 2SC9013,3DG8050,3DG12, requires β 〉=140;

Resistance R 1 is RTX-1/4W type metalfilmresistor, and resistance is 470 Ω; The resistance of current sampling resistor R2 is 0.1 Ω, power 〉=5W; The resistance of resistance R 3 is 1.5K Ω, power 〉=2W;

RP is potentiometer, its resistance 5.6 K Ω;

C1 selects the electrochemical capacitor of 470 μ F/40V; C3 selects the electrochemical capacitor of 3300 μ F/50V; C2 selects the electrochemical capacitor of 4.7 μ F/50V.

Circuit production main points and circuit debugging

Power transformer B requires power 〉=200W, and secondary coil L2 voltage is 35V, require operating current 〉=8A of secondary coil L2;

When making the circuit of high-power adjustable D. C regulated, as long as the electronic devices and components performance of selecting is intact, and the to specifications welding of the components and parts annexation in the accompanying drawing 1, after the physical connection line of circuit and welding quality were errorless through careful inspection, circuit only needed simple debugging to work;

When circuit debugging, the resistance of current sampling resistor R2 requires accurately, and the resistance of current sampling resistor R2 can further improve the output current of stabilized voltage power supply less than 0.1 Ω, otherwise will reduce output current.

Claims

1. high-power adjustable D. C regulated, it is comprised of 220V alternating current, ac buck transformer, full bridge rectifier, sample circuit, sampled signal adjustment amplification and current-limiting protection circuit, bleeder circuit, and its feature comprises:

The two ends of AC transformer B secondary coil L2 in the full bridge rectifier connect respectively the alternating current input of full-bridge rectification element QZ, the cathode output end of full-bridge rectification element QZ connects the positive pole of electrochemical capacitor C3, the cathode output end of full-bridge rectification element QZ links to each other with the negative pole of electrochemical capacitor C3 and circuit ground GND, the two termination 220V alternating currents of AC transformer B primary coil L1;

Sample circuit is comprised of three end adjustable shunt reference voltage source IC1 and resistance R 3, the positive pole of one termination electrochemical capacitor C3 of resistance R 3, the negative pole end of another termination three end adjustable shunt reference voltage source IC1 of resistance R 3 and the grid of adjusting pipe VT1, the positive terminal connection circuit ground GND of three end adjustable shunt reference voltage source IC1;

Sampled signal adjustment amplification and current-limiting protection circuit are by NPN type triode VT2, current sampling resistor R2 and adjustment pipe VT1 form, adjust pipe VT1 and adopt enhancement mode N channel high power field effect transistor, the model of selecting is 2SK790, the drain electrode of adjusting pipe VT1 connects the cathode output end of full-bridge rectification element QZ, the base stage of NPN type triode VT2 connects the source electrode of adjustment pipe VT1 and the end of current sampling resistor R2, the collector electrode of NPN type triode VT2 connects the grid of adjusting pipe VT1, the emitter of NPN type triode VT2, the other end of current sampling resistor R2 links to each other with the anodal VCC of output end of pressure-stabilizing;

Bleeder circuit is comprised of potentiometer RP and divider resistance R1, the anodal VCC of the termination output end of pressure-stabilizing of potentiometer RP, the reference edge of the anodal and three end adjustable shunt reference voltage source IC1 of the end of another termination divider resistance R1 of potentiometer RP, electrochemical capacitor C2, the negative pole of the other end of divider resistance R1 and electrochemical capacitor C2 links to each other with circuit ground GND.