CN203504856U

CN203504856U - Fluorescent lamp dc source drive unit

Info

Publication number: CN203504856U
Application number: CN201320668036.8U
Authority: CN
Inventors: 黄月华
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-24
Filing date: 2013-10-24
Publication date: 2014-03-26
Anticipated expiration: 2023-10-24

Abstract

The utility model relates to a fluorescent lamp dc source drive unit characterized by comprising a 12V dc source, an oscillation auxiliary circuit, a field effect transistor promotion circuit, and a boost and illumination circuit; the oscillation auxiliary circuit comprises an NPN type transistor VT1, a resistor R1, an NPN type transistor VT3, and a programmable unijunction transistor VT4, wherein the programmable unijunction transistor VT4 chooses 2B6027 model; a drain electrode of an enhanced N channel field effect transistor VT2 in the field effect transistor promotion circuit is connected with one end of a transformer T primary coil L1, the other end of the transformer T primary coil L1 is connected with a circuit anode VCC, a grid electrode of the enhanced N channel field effect transistor VT2 is connected with an emission electrode of the NPN type transistor VT1, and the drain electrode of an enhanced N channel field effect transistor VT2 is connected with circuit ground GND through a resistor R2; the boost and illumination circuit comprises a transformer T boost coil L2, a capacitor C1, and a fluorescent lamp RGD.

Description

Fluorescent lamp DC power supply drive unit

Technical field

The utility model belongs to electronics and emergency lighting technical field, relates to a kind of fluorescent lamp DC power supply drive unit.

Background technology

People are also more and more higher to the dependence of power supply now, once 220V AC-powered is interrupted, bring very large impact will to normal work, life and Students ' Learning, even cause some losses.Fluorescent lamp DC power supply drive unit is a kind of emergency lighting being independent of outside 220V alternating current electrical network, conventional emergency-lighting set mainly with maintenance free cell as DC power supply.

Fluorescent lamp DC power supply drive unit described in the utility model, it can tackle the requirement of supply lines short time emergency lighting while having a power failure, and is also applicable to emergency lighting or the fire emergency of various small-sized public places.

Below describe fluorescent lamp DC power supply drive unit described in the utility model related correlation technique content in force in detail.

Utility model content

Goal of the invention and beneficial effect: people are also more and more higher to the dependence of power supply now, once 220V AC-powered is interrupted, bring very large impact will to normal work, life and Students ' Learning, even causes some losses.Fluorescent lamp DC power supply drive unit is a kind of emergency lighting being independent of outside 220V alternating current electrical network, conventional emergency-lighting set mainly with maintenance free cell as DC power supply.Fluorescent lamp DC power supply drive unit described in the utility model, it can tackle the requirement of supply lines short time emergency lighting while having a power failure, and is also applicable to emergency lighting or the fire emergency of various small-sized public places.

Circuit working principle: circuit is when initial, and the emitter of NPN transistor VT1 drives enhancement mode N channel field-effect pipe VT2, its grid voltage is uprised, and make enhancement mode N channel field-effect pipe VT2 conducting.At this moment transformer T primary coil L1 shows as inductance, and electric current progressively rises in inductance.While arriving certain amperage by Current rise in transformer T, enhancement mode N channel field-effect pipe VT2 (≤1A), NPN transistor VT3 starts conducting, make the base stage of NPN transistor VT1 and the grid potential of programmable unijunction transistor VT4 pull to electronegative potential, cause programmable unijunction transistor VT4 to trigger, at this moment to show as an one-way SCR and drive rapidly the grid of enhancement mode N channel field-effect pipe VT2 be zero to programmable unijunction transistor VT4.At this moment, the energy being stored in transformer T primary coil L1 just turns to step-up coil L2, thereby the mercury vapour conduction in percussion fluorescent lamp RGD is finally pulled the trigger the light-emitting phosphor on fluorescent lamp tube wall.At this moment programmable unijunction transistor VT4 still remains stationary, until transformer T all discharges its energy to fluorescent lamp RGD.Now, the reverse current producing in transformer T flows back to enhancement mode N channel field-effect pipe VT2, cause the grid of enhancement mode N channel field-effect pipe VT2 slightly negative, because having distributed capacitance, enhancement mode N channel field-effect pipe VT2 exists, the anode of programmable unijunction transistor VT4 thereby also change are negative, programmable unijunction transistor VT4 cut-off, enhancement mode N channel field-effect pipe VT2 conducting again, starts the vibration in next cycle.

Technical scheme: fluorescent lamp DC power supply drive unit, it is promoted circuit, is boosted and lighting circuit forms by 12V DC power supply, vibration auxiliary circuit, field effect transistor, and its feature comprises:

Vibration auxiliary circuit: it is by NPN transistor VT1, resistance R 1, NPN transistor VT3 and programmable unijunction transistor VT4 form, one end of base stage connecting resistance R1 of NPN transistor VT1 and the grid of the collector electrode of NPN transistor VT3 and programmable unijunction transistor VT4, the anodal VCC of collector electrode connection circuit of the other end of resistance R 1 and NPN transistor VT1, the emitter of NPN transistor VT1 connects the anode of programmable unijunction transistor VT4, the emitter connection circuit ground GND of the negative electrode of programmable unijunction transistor VT4 and NPN transistor VT3, the base stage of NPN transistor VT3 connects the source electrode of enhancement mode N channel field-effect pipe VT2,

Field effect transistor promotes circuit: the drain electrode of enhancement mode N channel field-effect pipe VT2 connects one end of transformer T primary coil L1, the anodal VCC of other end connection circuit of transformer T primary coil L1, the grid of enhancement mode N channel field-effect pipe VT2 connects the emitter of NPN transistor VT1, and the drain electrode of enhancement mode N channel field-effect pipe VT2 is by resistance R 2 connection circuit ground GND;

Boost and lighting circuit: it is comprised of transformer T step-up coil L2, capacitor C 1 and fluorescent lamp RGD, one end of transformer T step-up coil L2 connects the filament of fluorescent lamp RGD one end by capacitor C 1, the filament of the fluorescent lamp RGD other end connects the other end of transformer T step-up coil L2;

The positive pole of 12V DC power supply is connected with circuit anode VCC, and the negative pole of 12V DC power supply is connected with circuit ground GND.

Accompanying drawing explanation

Accompanying drawing is the embodiment circuit working schematic diagram that the utility model provides a fluorescent lamp DC power supply drive unit.

Embodiment

According to fluorescent lamp DC power supply drive unit circuit working schematic diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in execution mode requires and circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.

The selection of components and parts and technical parameter

The resistance of resistance R 1 is 10K Ω; The resistance of resistance R 2 is 0.62 Ω, and power is 2W;

VT1, VT3 are NPN transistor, and the model of selecting is 2SC9013, require multiplication factor β >=150;

VT2 is enhancement mode N channel field-effect pipe, and the model of selecting is IRFZ22;

VT4 is programmable unijunction transistor, and the model of selecting is 2N6027;

C1 is electric capacity, selects electric capacity of the dacron, and its capacity is 820PF, and withstand voltage is 1000V;

RGD is fluorescent lamp, the optional fluorescent lamp that is 6～8W with power;

DC power supply is selected 12V, 7AH maintenance free cell, and when emergent, 12V DC power supply can be used 8 joint 1# manganese-zinc batteries.

Circuit production main points and circuit debugging

The making of transformer T: magnetic core is selected U-shaped FERRITE CORE, or ring type magnetic core, primary coil L1 is used ￠ 0.33～0.41mm enamelled wire around 33 circles, and step-up coil L2 is used ￠ 0.15mm enamelled wire around 600 circles;

The circuit of fluorescent lamp DC power supply drive unit is as long as the components and parts performance of using is intact, annexation according to components and parts shown in accompanying drawing is welded, physics wiring is conscientiously checked and check errorless after, the circuit of this device does not need to debug and can normally work;

When 12V DC power supply, current sinking is 160mA, and circuit oscillation frequency is about 30kHz;

Resistance R 1 is used for controlling the brightness of fluorescent lamp RGD, and resistance R 1 resistance hour can increase the switching energy in transformer T, and fluorescent lamp RGD luminosity is increased.

Claims

1. a fluorescent lamp DC power supply drive unit, it is promoted circuit, is boosted and lighting circuit forms by 12V DC power supply, vibration auxiliary circuit, field effect transistor, and its feature comprises:

Described vibration auxiliary circuit is by NPN transistor VT1, resistance R 1, NPN transistor VT3 and programmable unijunction transistor VT4 form, the model that programmable unijunction transistor VT4 selects is 2N6027, one end of base stage connecting resistance R1 of NPN transistor VT1 and the grid of the collector electrode of NPN transistor VT3 and programmable unijunction transistor VT4, the anodal VCC of collector electrode connection circuit of the other end of resistance R 1 and NPN transistor VT1, the emitter of NPN transistor VT1 connects the anode of programmable unijunction transistor VT4, the emitter connection circuit ground GND of the negative electrode of programmable unijunction transistor VT4 and NPN transistor VT3, the base stage of NPN transistor VT3 connects the source electrode of enhancement mode N channel field-effect pipe VT2,

The drain electrode of enhancement mode N channel field-effect pipe VT2 in described field effect transistor promotion circuit connects one end of transformer T primary coil L1, the anodal VCC of other end connection circuit of transformer T primary coil L1, the grid of enhancement mode N channel field-effect pipe VT2 connects the emitter of NPN transistor VT1, and the drain electrode of enhancement mode N channel field-effect pipe VT2 is by resistance R 2 connection circuit ground GND;

Described boosts and power for illumination routing transformer T step-up coil L2, capacitor C 1 and fluorescent lamp RGD composition, one end of transformer T step-up coil L2 connects the filament of fluorescent lamp RGD one end by capacitor C 1, the filament of the fluorescent lamp RGD other end connects the other end of transformer T step-up coil L2;

The positive pole of described 12V DC power supply is connected with circuit anode VCC, and the negative pole of 12V DC power supply is connected with circuit ground GND.