CN102611317A

CN102611317A - Pointer type universal meter direct-current booster

Info

Publication number: CN102611317A
Application number: CN2012100979215A
Authority: CN
Inventors: 黄宇嵩
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-05
Filing date: 2012-04-05
Publication date: 2012-07-25

Abstract

The invention belongs to the field of electronic technology application and relates to a pointer type universal meter direct-current booster. The direct-current booster is formed by a 1.5-V battery, a complementary multi-vibrator circuit, a vibration frequency adjusting circuit, a pulse boosting circuit and a rectification filtering voltage stabilizing circuit. The pointer type universal meter direct-current booster is a necessary tool for electricians and electronic technology workers and commonly utilizes one 9-V, 15-V or 22.5-V overlapped battery to measure the high resistance of a resistor. The overlapped battery has a high price and a very short service life, so that the overlapped battery needs to be frequently exchanged and the existing pointer type universal meter direct-current booster is not economical. The pointer type universal meter direct-current booster, disclosed by the invention, is applicable to a small-sized direct-current booster circuit for a pointer type universal meter; the pointer type universal meter direct-current booster disclosed by the invention takes 22.5 V as an embodiment and the direct-current booster has the advantages of simple circuit structure and fewer used elements; and a circuit board of the booster can be directly placed at the position of the overlapped battery in the previous pointer type universal meter.

Description

The pointer multimeter DC booster

Technical field

The invention belongs to the application of electronic technology field, is about a kind of pointer multimeter DC booster.

Background technology

Pointer multimeter is an indispensable instrument of being engaged in electrician, electronic technology worker, and the height of its measuring resistance stops the laminated cell of common use 9V, 15V or a 22.5V.This laminated cell not only price is higher, and useful life is short especially, often changes very uneconomical.Pointer multimeter DC booster of the present invention is fit to the small-sized DC booster circuit that pointer multimeter uses; The present invention is embodiment with the output 22.5V that boosts; This DC booster have circuit structure simple, use components and parts few, the circuit board of stepup transformer can directly place the position of former pointer multimeter laminated cell.

Below specify pointer multimeter DC booster related relevant technologies content in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: pointer multimeter is an indispensable instrument of being engaged in electrician, electronic technology worker, and the height of its measuring resistance stops the laminated cell of common use 9V, 15V or a 22.5V.This laminated cell not only price is higher, and useful life is short especially, often changes very uneconomical.Pointer multimeter DC booster of the present invention is fit to the small-sized DC booster circuit that pointer multimeter uses; The present invention is embodiment with the output 22.5V that boosts; That this DC boosting utensil circuit has is simple in structure, use components and parts few, and the circuit board of stepup transformer can directly place the position of former pointer multimeter laminated cell.

The circuit working principle: the circuit of pointer multimeter DC booster is made up of complementary multivibrator and booster circuit and rectifying and wave-filtering voltage stabilizing three parts.Circuit is by the single-unit 1.5V powered battery in the former pointer multimeter, and operating current is about 25mA, the about 0.6mA of output current, and the power of stepup transformer output is used for the universal instrument height and stops fully and can satisfy the demand.Circuit is formed complementary multivibrator by NPN type triode VT1, positive-negative-positive triode VT2, and its frequency of oscillation is about 2kHz.The primary coil L1 of step-up transformer T is the load of complementary multivibrator; Secondary coil L2 and secondary coil L3 are step-up coil; Become high voltage direct current after exporting higher pulse voltage process diode D1 halfwave rectifier and electrochemical capacitor C2 filtering; Through output 22.5V stable DC voltage after current-limiting resistance R3, bleeder resistance R4 and the zener diode DW voltage stabilizing, this voltage can directly replace the 22.5V laminated cell again.RP is the pulse frequency regulator potentiometer in the circuit.

Technical characterictic: the pointer multimeter DC booster, it is made up of 1.5V battery, complementary multi-resonant oscillating circuit and frequency of oscillation adjustment circuit, pulse boostering circuit and rectification filtering voltage stabilizing circuit, and its characteristic comprises:

Complementary multi-resonant oscillating circuit and frequency of oscillation adjustment circuit: form by NPN type triode VT1, positive-negative-positive triode VT2, step-up transformer primary coil L1, linear potentiometer RP, resistance R 1 and resistance R 2, capacitor C 1; The end of the base stage connecting resistance R1 of NPN type triode VT1 and an end of resistance R 2; The end of the other end wiring property potentiometer RP of resistance R 1; The anodal VCC of the other end of linear potentiometer RP and lever arm connection circuit thereof; One end of another termination capacitor C 1 of resistance R 2, the collector electrode of NPN type triode VT1 connects the base stage of positive-negative-positive triode VT2, the anodal VCC of the emitter connection circuit of positive-negative-positive triode VT2; The collector electrode of positive-negative-positive triode VT2 connects the end of step-up transformer primary coil L1 and the other end of capacitor C 1, the other end connection circuit ground GND of step-up transformer primary coil L1;

Pulse boostering circuit and rectification filtering voltage stabilizing circuit: form by step-up transformer secondary coil L2 and secondary coil L3, switching diode D1, electrochemical capacitor C2, resistance R 3, resistance R 4, voltage stabilizing didoe DW and DC output end; The positive pole of the last termination switching diode D1 of step-up transformer secondary coil L3; The lower end of step-up transformer secondary coil L3 links to each other with the upper end of step-up transformer secondary coil L2; The negative pole of switching diode D1 connects the positive pole of electrochemical capacitor C2 and an end of resistance R 3; The lower end of the secondary coil L2 of step-up transformer and the negative pole of electrochemical capacitor C2 connect direct current cathode output end; One end of the other end of resistance R 3 and resistance R 4 and the negative pole of voltage stabilizing didoe DW connect direct current cathode output end, and the positive pole of the other end of resistance R 4 and voltage stabilizing didoe DW connects direct current cathode output end.

Description of drawings

Accompanying drawing 1 is the embodiment circuit working schematic diagram that the present invention provides a pointer multimeter DC booster; The 1.5V dc power cathode links to each other with circuit ground GND in the accompanying drawing 1.

Embodiment

Circuit working schematic diagram and description of drawings according to pointer multimeter DC booster shown in the accompanying drawing 1; And according to the annexation between the components and parts in the said circuit of summary of the invention, and the components and parts technical parameter described in the execution mode requires to implement to realize the present invention.

The selection of components and parts and technical parameter

The embodiment of the invention is an example with the output 22.5V that boosts:

VT1 selects middle power NPN type triode for use, and model is a pliotron in the positive-negative-positives such as 2SC9013;

VT2 selects small-power positive-negative-positive triode for use, and model is positive-negative-positive low-power transistors such as 3AX31;

D1 is a switching diode, selects model 1N4148 for use; DW is a voltage stabilizing didoe, and parameter is 22～23V;

Resistance R 1～R4 all uses fixed carbon resister, and resistance is respectively 20K Ω, 1K Ω, 8.2K Ω, 6.2K Ω;

RP is a linear potentiometer, and resistance is 47K Ω;

C1 is a magnetic sheet electric capacity, and capacity is 1000PF; C2 is an electrochemical capacitor, and its capacity is 3.3 μ F/50V;

SW1 is a mains switch, selects single-pole single-throw switch (SPST) for use;

1.5V DC power supply can use No. 2 dry cells of single-unit.

Circuit production main points, circuit debugging and use

The 502 type audio frequency output transformers that step-up transformer T can use with transistor; Secondary coil is elementary as step-up transformer, and former elementary coil is secondary as step-up transformer, and former elementary coil centre tap is empty need not; If select less than suitable transformer; Also can use the silicon steel sheet of broadcast receiver output transformer to make, primary coil use diameter as the high strength enamelled wire of 0.21mm around 110 circles, secondary use diameter as the high strength enamelled wire of 0.12mm around 520 circles; To add one deck insulation film for the first time and between the level, and note the end sign of the same name of secondary coil;

Turn linear potentiometer RP can change the operating frequency of oscillating circuit, if when voltage is greater than 28V between switching diode D1 negative pole and direct current cathode output end, can suitably reduces the resistance of linear potentiometer RP, or suitably reduce the resistance of resistance R 4;

If the voltage of voltage influences the voltage stabilizing output effect less than 25V between switching diode D1 negative pole and direct current cathode output end; Except that the resistance of suitable increase resistance R 4; Interchangeable 1 switching diode D1 or use the Schottky diode examination instead is perhaps on electrochemical capacitor C2 and connect the electrochemical capacitor of 1 same capability.

Claims

1. pointer multimeter DC booster, it is made up of 1.5V battery, complementary multi-resonant oscillating circuit and frequency of oscillation adjustment circuit, pulse boostering circuit and rectification filtering voltage stabilizing circuit, and its characteristic comprises:

Complementary multi-resonant oscillating circuit and frequency of oscillation adjustment circuit are made up of NPN type triode VT1, positive-negative-positive triode VT2, step-up transformer primary coil L1, linear potentiometer RP, resistance R 1 and resistance R 2, capacitor C 1; The end of the base stage connecting resistance R1 of NPN type triode VT1 and an end of resistance R 2; The end of the other end wiring property potentiometer RP of resistance R 1; The anodal VCC of the other end of linear potentiometer RP and lever arm connection circuit thereof; One end of another termination capacitor C 1 of resistance R 2, the collector electrode of NPN type triode VT1 connects the base stage of positive-negative-positive triode VT2, the anodal VCC of the emitter connection circuit of positive-negative-positive triode VT2; The collector electrode of positive-negative-positive triode VT2 connects the end of step-up transformer primary coil L1 and the other end of capacitor C 1, the other end connection circuit ground GND of step-up transformer primary coil L1;

Pulse boostering circuit and rectification filtering voltage stabilizing circuit are made up of step-up transformer secondary coil L2 and secondary coil L3, switching diode D1, electrochemical capacitor C2, resistance R 3, resistance R 4, voltage stabilizing didoe DW and DC output end; The positive pole of the last termination switching diode D1 of step-up transformer secondary coil L3; The lower end of step-up transformer secondary coil L3 links to each other with the upper end of step-up transformer secondary coil L2; The negative pole of switching diode D1 connects the positive pole of electrochemical capacitor C2 and an end of resistance R 3; The lower end of the secondary coil L2 of step-up transformer and the negative pole of electrochemical capacitor C2 connect direct current cathode output end; One end of the other end of resistance R 3 and resistance R 4 and the negative pole of voltage stabilizing didoe DW connect direct current cathode output end, and the positive pole of the other end of resistance R 4 and voltage stabilizing didoe DW connects direct current cathode output end.