CN2141639Y - Electronic transformer for neon lamp - Google Patents

Abstract

The utility model relates to an electronic transformer for a neon lamp, comprising a rectification circuit, a sinusoidal wave generator, a supersonic transformer and an over-load protection circuit connected in the front of the sinusoidal wave generator. The electronic transformer of the utility model has the advantages of light weight, convenient operation, favorable anti-interference ability, can effectively protect the electronic transformer in the possible failure of a high-voltage open circuit or and an output short circuit, and can enable the circuit automatically reset after the failure is cleared, increasing the service life of the electronic transformer for the neon lamp.

Description

Electronic transformer for neon lamp

A kind of neon sign electron transformer relates to the improvement of transformer lines.

The electronic transformer that is used at present the high pressure neon light on the market; though also have the high pressure open-circuit protecting device; but all are the inputs that fuse BX are serially connected in the superaudio transformer; puncture contact M, N by the high pressure open circuit that is connected on output; disruptive discharge when the high pressure zero load occurring; blow fuse BX, thereby it is unlikely impaired to reach the protection electronic transformer that electronic transformer is not worked.Because after fuse BX blows; people can not allow it automatically reset; still it to be pulled down maintenance (general fuse BX is contained in outdoor with neon light); moreover this electronic transformer does not generally have short-circuit protection; in case because of the external circuit reason produces short circuit current; burn electronic transformer equally, can not deal with the generation of various abnormal conditions, the useful life of electronic transformer is not long.

The purpose of this utility model is to provide a kind of novel neon sign electron transformer, both can occur making the electronic transformer failure of oscillation when high pressure is unloaded, and the protection transformer is not impaired; Also can because of the external circuit short circuit time, make electronic transformer not impaired; Simultaneously can also be after eliminating fault, directly starting transformer is reworked, and does not need it is removed maintenance, has prolonged the useful life of electronic transformer.

The utility model is to implement like this; in the neon sign electron transformer of forming by rectification circuit 1, sine-wave generator 2, superaudio transformer 3; added overload protecting circuit 4; wherein overload protecting circuit is formed by testing circuit, comparison circuit with by the control circuit that LK forms, and is connected on before the sine-wave generator 2.

Below in conjunction with accompanying drawing in detail enforcement of the present utility model is described in detail.

Fig. 1 is a block diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

As shown in the figure; the rectification circuit 1 that the utility model is made up of D1～D4, the sine-wave generator of forming by L3, L4, L5, L6, L7, L8, BG2, BG3, R5, R6, C7, C8 2 and the basic circuit of forming electronic transformer by the high-tension circuit that superaudio transformer 3 is formed; in the prime of sine-wave generator 2, insert an overload protecting circuit 4.This circuit is made up of testing circuit, comparison circuit, circuits for triggering and control circuit.Wherein, the testing circuit of being made up of R1, D6, C4 is connected on respectively on the end of the negative pole of rectification circuit 1 of electronic transformer and sine-wave generator 2, and comparison circuit is made up of R2, D5, and circuits for triggering are made up of B3, BG1, and controller then is made up of LK.

In order to protect sine-wave generator 2 unlikely generation misoperations, the utility model is equipped with the anti-jamming circuit 5 that a cover is made up of L1, L2, C1, C2 between mains electricity input end and rectification circuit 1, in order to reduce the interchange radiated interference electric wave that civil power is sent here on the net.When connecting the power supply of electronic transformer, mains supply is sent into rectification behind anti-jamming circuit 5, again through the filtering of C3, obtain a level and smooth direct current, and the positive pole of this signal is connect to R4, charge to C5 through R4, and when being charged to the threshold values of BD, the BD conducting; C5 is by utmost point discharge of base of BG2 simultaneously, make the BG2 conducting, because L3, L4, L5 are positive coupled modes, so sine-wave generator 2 starting of oscillations, the signal that produces is added on the elementary L8 of superaudio transformer 3, through boosting of transformer B, on output L9, obtain one and remove to light neon lamp tube up to the high pressure about 3000V, guaranteed the reliable in action of electronic transformer.

When because neon light tube damages, when forming the output open circuit, voltage across poles height at this moment very easily produces spark phenomenon.In case interpolar sparking causes promptly to occur instantaneous large-current on the L9 that feed back on the L8, voltage jumps on the R1 of testing circuit, greater than being 2.5 volts under the 5V(normal condition).This voltage reaches more than the 6.6V through the effect liter of C4, D6, has triggered the conducting of BG1.Because this electric current is powered to 1,2 pin of controller LK through the A of R3, the BG1 utmost point, the R utmost point, it is infinitely small making output 3,4 signals of LK, force this signal directly to land through the base stage of BG2, ended the conducting of oscillating tube BG2, make the original circuit failure of oscillation that is vibrating, no longer the sine wave output signal.Because BG1 is a triode thyrister, in case when being in conducting state, whole sine wave oscillation circuit is in the failure of oscillation state, not under the triggering of the new signal that power supply comes, this state is keeping always, therefore, before not getting rid of the fault of neon light tube, the said electronic transformer of the utility model no longer moves.

After extraneous fault was got rid of, people were as long as press the start button of neon sign electron transformer again and since this moment R1 voltage be in state less than 2.7V, be lower than the conducting threshold values of D5, D5 can not get triggering, overload protecting circuit 5 is not worked.The sine-wave generator 2 of electronic transformer can normally start neon light, finishes normally resetting of circuit.

Equally; if because external circuit is subjected to the effect of all factors; when the output short circuit; can produce an instantaneous large-current equally,, feed back on the R1 of testing circuit of protective circuit through the effect of superaudio transformer B; through as mentioned above; equally can make the electronic transformer failure of oscillation, be convenient for people to maintenance and restart neon light, protect the safety of transformer itself.

Adopted the said neon sign electron transformer of the utility model; have in light weight, easy to use, good in anti-interference performance; in the fault of high pressure open circuit that may occur or output short-circuit; can protect electronic transformer effectively; in case and fault can make circuit automatically reset after eliminating easily, improved the useful life and the practicality of neon sign electron transformer greatly.

Claims (3)

1, a kind of neon sign electron transformer is made up of rectification circuit, sine-wave generator, superaudio transformer, it is characterized in that adding before sine-wave generator the overload protecting circuit of being made up of testing circuit, comparison circuit, circuits for triggering and control circuit.

2, according to the said neon sign electron transformer of claim 1; it is characterized in that said overload protecting circuit is made up of R1, R2, R3, BG1, C4, D5, D6, LK; wherein R1, C4, D6 form testing circuit; R2, D5 form comparison circuit; R3, BG1 form circuits for triggering, and LK forms control circuit.

3,, it is characterized in that being equipped with one in said rectification circuit front overlaps the anti-jamming circuit of being made up of L1, L2, C1, C2 according to the said neon sign electron transformer of claim 1.

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