CN202535277U

CN202535277U - 15V DC boosting device of pointer multimeter

Info

Publication number: CN202535277U
Application number: CN2012202152429U
Authority: CN
Inventors: 洪珍; 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-14
Filing date: 2012-05-14
Publication date: 2012-11-14
Anticipated expiration: 2022-05-14

Abstract

The utility model discloses a 15V DC boosting device of a pointer multimeter. The DC boosting device comprises a 1.5V battery, a multivibrator circuit, an oscillation frequency adjusting circuit, a boosting circuit and a rectifying, filtering and voltage-stabilizing circuit. A 9V or 15V or 22.5V laminated battery is used in general when the pointer multimeter is used for measuring high impedence of the resistance. The laminated battery is higher in cost, not easy to be purchased sometimes, is extremely short in service life and not economic due to frequency replacement. The 15V DC boosting device of the pointer multimeter can boost 1.5V voltage to 15V voltage for the pointer multimeter. The DC boosting device disclosed by the utility model has a simple circuit structure and fewer used components; and a circuit board of the boosting device can be directly arranged at a position of the laminated battery in the original pointer multimeter.

Description

Pointer universal instrument 15V DC boosting device

Technical field

The utility model belongs to electronics and dc inverter technical field, is about a kind of pointer universal instrument 15V DC boosting device.

Background technology

Pointer multimeter is electronic technology worker, electrician, the indispensable instrument of radio amateur.Pointer multimeter stops the laminated cell of 9V of common use or 15V or 22.5V at the height of measuring resistance.This laminated cell not only price is higher, differ sometimes and bought this laminated cell surely, and useful life is short especially, often changes very uneconomical.The described pointer multimeter DC boosting of the utility model device can rise to 15V with 1.5V voltage and supply pointer multimeter to use.This DC boosting device have circuit structure simple, use components and parts few, the circuit board of increasing apparatus can directly place the position of former pointer multimeter laminated cell.

Below specify this pointer universal instrument 15V DC boosting device related relevant technologies content in implementation process.

The utility model content

Goal of the invention and beneficial effect: pointer multimeter stops the laminated cell of 9V of common use or 15V or 22.5V at the height of measuring resistance.This laminated cell not only price is higher, differ sometimes and bought this laminated cell surely, and useful life is short especially, often changes very uneconomical.The described pointer multimeter DC boosting of the utility model device can rise to 15V with 1.5V voltage and supply pointer multimeter to use.This DC boosting device have circuit structure simple, use components and parts few, the circuit board of increasing apparatus can directly place the position of former pointer multimeter laminated cell.

The circuit working principle: the described pointer universal instrument of utility model 15V DC boosting device circuit comprises multivibrator and booster circuit and rectification filtering voltage stabilizing circuit three parts composition.The power supply of increasing apparatus is by the 1.5V powered battery in the former pointer universal instrument, and operating current is about 18mA, and output current >=1mA, the power of increasing apparatus output voltage are used for the universal instrument height and stop 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 is a step-up coil; Export the direct current that higher pulse voltage obtains about 17V after through switching diode D1 halfwave rectifier and electrochemical capacitor C2 filtering; Through output 15V stable DC voltage after current-limiting resistance R2 and the zener diode DW voltage stabilizing, potentiometer RP is used for the adjusting of frequency of oscillation in the circuit.This 15V stable DC voltage can directly replace the 15V laminated cell.

Technical characterictic: pointer universal instrument 15V DC boosting device, it comprises 1.5V battery, multi-resonant oscillating circuit and frequency of oscillation regulating circuit, booster circuit and rectification filtering voltage stabilizing circuit composition, it is characterized in that:

Multi-resonant oscillating circuit and frequency of oscillation regulating circuit: form by NPN type triode VT1, positive-negative-positive triode VT2, step-up transformer primary coil L1, potentiometer RP, resistance R 1 and capacitor C 1; The end of the base stage connecting resistance R1 of NPN type triode VT1 and the end of potentiometer RP; The anodal VCC of the other end of potentiometer RP and lever arm connection circuit thereof; One end of another termination capacitor C 1 of resistance R 1; 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;

Booster circuit and rectification filtering voltage stabilizing circuit: form by step-up transformer secondary coil L2, switching diode D1, electrochemical capacitor C2, resistance R 2, voltage stabilizing didoe DW and DC output end; The positive pole of the termination switching diode D1 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 2; The other end of the secondary coil L2 of step-up transformer and the negative pole of electrochemical capacitor C2 connect direct current cathode output end; The negative pole of another termination voltage stabilizing didoe DW of resistance R 2 and direct current cathode output end, the positive pole of voltage stabilizing didoe DW connects direct current cathode output end.

1.5V the anodal VCC of connection circuit behind the positive pole of the battery serial connection mains switch SW, the negative pole of 1.5V battery 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 pointer universal instrument 15V DC boosting device; The negative pole of 1.5V battery links to each other with circuit ground GND in the accompanying drawing 1.

Embodiment

Circuit working schematic diagram and description of drawings according to the 15V of pointer universal instrument shown in the accompanying drawing 1 DC boosting device; And according to the annexation between the components and parts in the said circuit of utility model content, and the components and parts technical parameter described in the execution mode and requirement are implemented to realize the utility model.

The selection of components and parts and technical parameter

The utility model embodiment is an example with the 15V direct current that boosts:

VT1 is a NPN type triode, and the model of selecting for use is 2SC9013;

VT2 is the positive-negative-positive triode, and the model of selecting for use is 3AX31;

D1 is a switching diode, selects model 1N4148 for use;

DW is a voltage stabilizing didoe, and parameter is 14～16V;

Resistance R 1～R2 all uses metalfilmresistor, and resistance is respectively 20K Ω, 6.2K Ω;

RP is a 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 10 μ F/25V;

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

1.5V No. 2 MnZn dry cells of the used single-unit of battery.

The making main points and the circuit debugging of circuit

The making of step-up transformer T: the silicon steel sheet that uses the transistor output transformer; Primary coil uses diameter flat around 110 circles as the high strength enamelled wire layering of 0.21mm; Secondary coil use diameter as the high strength enamelled wire of 0.1mm around 400～420 circles, need add one deck insulation film between primary coil and the secondary coil;

Turn potentiometer RP can change the operating frequency of oscillating circuit, if when voltage is greater than 17V between switching diode D1 negative pole and direct current cathode output end, can suitably reduce the resistance of potentiometer RP, or the resistance of resistance R 2 is increased to 8.2K Ω;

If the voltage of voltage influences the voltage stabilizing output effect less than 17V between switching diode D1 negative pole and direct current cathode output end; Except that the resistance of suitable increase resistance R 2; Can change 1 switching diode D1 or use Schottky diode instead, perhaps on electrochemical capacitor C2 and connect the electrochemical capacitor of 1 same capability; Output valve is still on the low side if boost, and can suitably increase the number of turn of step-up transformer T secondary coil.

Claims

1. pointer universal instrument 15V DC boosting device, it comprises that 1.5V battery, multi-resonant oscillating circuit and frequency of oscillation regulating circuit, booster circuit and rectification filtering voltage stabilizing circuit form, and it is characterized in that:

Multi-resonant oscillating circuit and frequency of oscillation regulating circuit are made up of NPN type triode VT1, positive-negative-positive triode VT2, step-up transformer primary coil L1, potentiometer RP, resistance R 1 and capacitor C 1; The end of the base stage connecting resistance R1 of NPN type triode VT1 and the end of potentiometer RP; The anodal VCC of the other end of potentiometer RP and lever arm connection circuit thereof; One end of another termination capacitor C 1 of resistance R 1; 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;

Booster circuit and rectification filtering voltage stabilizing circuit are made up of step-up transformer secondary coil L2, switching diode D1, electrochemical capacitor C2, resistance R 2, voltage stabilizing didoe DW and DC output end; The positive pole of the termination switching diode D1 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 2; The other end of the secondary coil L2 of step-up transformer and the negative pole of electrochemical capacitor C2 connect direct current cathode output end; The negative pole of another termination voltage stabilizing didoe DW of resistance R 2 and direct current cathode output end, the positive pole of voltage stabilizing didoe DW connects direct current cathode output end.

2. pointer universal instrument 15V DC boosting device according to claim 1 is characterized in that: the anodal VCC of connection circuit behind the positive pole serial connection mains switch SW of 1.5V battery, the negative pole of 1.5V battery links to each other with circuit ground GND.