CN2149083Y - Transformer for neon lamp - Google Patents

Abstract

The utility model relates to a self-exciting electronic switching type power source of a neon lamp, comprising a bridge rectifier, a starting trigger, a high-frequency self-oscillation link, a novel double push-pull field-effect transistor, a single-pack type voltage-boosting ferrite transformer, etc. The driving of the power tube of the utility model adopts an optimal overdriving mode, and the utility model has the high efficiency of circuit switching, the wide range of application of voltage, the low temperature increment of the complete machine of the utility model, strong continuous working capability, high frequency, high voltage, very small volume, symmetrical mounting holes on the casing of the utility model, very convenient operation but no working noise.

Description

Transformer for neon lamp

The utility model relates to a kind of electric neon light transformer.

The main power component of gas tube sign transformer all adopts bipolar transistor at present; it is used on high-power switching circuit; have some intrinsic shortcomings: driving power consumption is big; the saturation voltage drop height; thereby the pipe consumption is high; the shell temperature is high; this will increase self consuming energy of integrated circuit undoubtedly; worsen the operational environment of other electronic devices; work to transformer is unfavorable; a kind of efficient electricity-saving neon lamp power source is disclosed in CN2056303U; it is by oscillating circuit; start-up circuit; high-voltage output circuit; protective circuit and power circuit are formed; though it has used field effect transistor rate of doing work element; but owing to adopt the protective circuit of amplitude limit voltage stabilizing triode as power tube; it must be lower than over-drive value to power tube input amplitude limit value; just can not realize initially overdriving of power tube; the pipe consumption is bigger; and voltage-stabiliser tube is converted in the turn off process by opening at power tube; because reversed electric field has ordered about the outer of charge carrier and has moved; so when reverse electricity disappears; the recovery of inner charge carrier will worsen the turn-off criterion of power tube; strengthen turn-off power loss; the forward PN junction of voltage-stabiliser tube has good conduction in addition; make energy partly consume on the resistance flowing resistance thermal power of power tube input branch road, make product heating temperature rise too fast.

The purpose of this utility model is the up-to-date theoretical principle according to electronic switch: reduce switching loss, and dynamic process the best that the excitation energy that use is initially overdrived is opened pipe, the pipe consumption is minimum, and design a kind of simple in structure, the pipe consumption is little, and temperature rise is low, and the neon light that volume is little is pressed and become device.

The purpose of this utility model realizes by following structure: gas tube sign transformer, include shell and current rectifying and wave filtering circuit in the enclosure, and circuits for triggering, self-excitation feedback circuit and power promote output circuit and transformer B ₂, its principal character is: it is by two field effect transistor T that the power in the shell promotes output circuit ₁, T ₂And C ₅, C ₄Constitute, the self-excitation feedback circuit is by R ₁Be connected on B ₁Coil L ₁On half-wave exciting circuit R ₃And D ₆And be connected on coil L ₂First wave excitation circuit R ₄, D ₇Constitute, during use, 1., utilize diode D because the direct current half-wave mode of optimizing is adopted in the power tube excitation ₆, D ₇Unidirectional conduction, with oscillation transformer B ₁The invalid loss that drives link has been eliminated in the negative half-wave current blocking-up of two excitation coils, makes the divider resistance R of power tube input branch road ₃, R ₄Can select less power grade for use, the work temperature rise descends, and has improved the reliability of complete machine continuous operation; 2. owing to adopt initial blasting to drive to power tube, according to pipe consumption formula △ P=△ U. △ I, can get, the primary quantity that increases excitation can improve the climbing of opening electric current and reduce dynamically saturated and pressure drop, shorten standard-sized sheet and pass through journey, the utility model can suitably improve the driving voltage amplitude, makes the forward position of excitation waveform and the input pipe consumption is reduced to the utmost point that crest nondestructively is transmitted to power tube.

The utility model compared with prior art has: simple in structure, advantage such as pipe consumption is low, and power saving is energy-conservation, and temperature rise is low can be dwindled the volume of transformer effectively, guarantees the reliability of its continuous operation.

Description of drawings of the present utility model is as follows:

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

Fig. 2 is a shell stereogram of the present utility model.

Among the figure: 1. current rectifying and wave filtering circuit, 2. circuits for triggering, 3. the self-excitation feedback circuit, 4. power promotes output circuit, 5. shell, 6. electrode hole, 7. groove, 8. louvre.

Below in conjunction with drawings and Examples structure of the present utility model and principle are described further:

As shown in Figure 1: the utility model includes shell 5 and current rectifying and wave filtering circuit in the enclosure 1, circuits for triggering 2, and self-excitation feedback circuit 3 and power promote output circuit 4 and transformer B ₂, wherein: it is by two field effect transistor T that the power in the shell promotes output circuit ₁, T ₂And C ₅, C ₄Constitute, the self-excitation feedback circuit is by B ₁Be connected on B ₁Coil L ₁Half-wave exciting circuit R ₃And D ₆And be connected on coil L ₂On half-wave exciting circuit R ₄, D ₇Constitute, through testing oscillation transformer B repeatedly ₁Each coil ratio be L ₁: L ₂: L ₃=18:18:6 makes oscillation circuit working properly stable, and its energy consumption reduces, and is determined by experiment L ₁And R ₃, D ₆And L ₂, R ₄, D ₇Value, can make the initial overdrive voltage of exciting circuit is T ₁, T ₂2.5 times of rated value also can be realized working stability, and energy consumption is little, and the purpose that temperature rise is little in order further to reduce the volume of this transformer, can be on shell has groove 7 between two electrode holes 6 when defeated; All there is semicircle louvre 8 two side at shell, with the mutual thermal impact between before and after weakening in the transformer, and the heat of the shell that sheds, thus reduce the temperature rise of enclosure interior circuit, as shown in Figure 2.

Operation principle of the present utility model is as follows:

Alternating current is through D ₁～D ₄Behind the rectifying and wave-filtering, for circuit provides direct-current working volts, C at first ₂By R ₁Charging voltage is to D ₅During conducting voltage, T ₂The pipe conducting makes T ₁The midpoint potential that Guan Yuqi is unified into is approximate to be equal to earth potential, and another road of this conducting voltage is through R ₂Cross B ₁N ₁Ground under the coil is because bidirectional diode D ₅Stronger discharge capability after higher threshold value and the conducting is arranged, C ₂On voltage drop to D very soon ₅Turn-off, and C ₅, C ₄Charging already finishes T ₂The conducting of pipe makes C ₄Discharge (C ₅Charging) electric current is through B ₂Former limit and B ₁N ₃Coil is crossed T ₂Pipe is ground down, at B ₁The polarity of voltage of last induction tries hard to keep T ₂The conducting of pipe.Work as C ₄Discharge stream is by being increased to when weakening gradually B gradually ₁The electromotive force of induction makes T ₂Pipe turn-offs, and makes T ₁The pipe conducting, midpoint potential rises to C ₁The dc voltage value of anode, C ₄Charging (C ₅Discharge) electric current is through B ₁N ₃And B ₂Flow backwards back in former limit, this electric current is kept T ₁C is worked as in conducting ₄Charging current reduces, at B ₁The electromotive force of last induction makes T ₁Pipe turn-offs, and makes T ₂Manage conducting again, midpoint potential is left behind again to be similar to and is waited earth potential, C ₄Charging (C ₅Discharge), repeat the course of work of one-period, go round and begin again, circuit is kept self-oscillation.Though after the circuit self-oscillation, C ₂Still by R ₁Charging, but because its time constant is bigger, far away from T ₁, T ₂The cycle of alternate conduction upset is fast, and the conducting electric current is to B ₁Feedback effect also greater than by D ₅The discharging current of coming over, R thus ₁, C ₁Only be leading role, the work vibration then is by T ₁, T ₂Alternate conduction is at B ₁On cause the feedback self-excitation keep.The C that this alternate conduction causes ₄, C ₅Charging and discharging currents, output transformer B is travelled to and fro between in turnover ₂Former limit, through B ₂The outer end load is exported in the limit coupling of paying of multiturn number.

Claims (4)

1, a kind of gas tube sign transformer includes shell 5 and current rectifying and wave filtering circuit in the enclosure 1, circuits for triggering 2, and self-excitation feedback circuit 3 and power promote output circuit 4 and transformer B ₂, it is characterized in that: the moving output circuit of the power in the shell is by two field effect transistor T ₁, T ₂And C ₅, C ₄Constitute, the self-excitation feedback circuit is by B ₁Be connected on B ₁Coil L ₁On half-wave exciting circuit R ₃And D ₆And be connected on coil L ₂On half-wave exciting circuit R ₄, D ₇Constitute.

2, neon light as claimed in claim 1 is pressed and is become device, it is characterized in that: B ₁Each coil ratio be L ₁: L ₂: L ₃=18:18:6.

3, neon light as claimed in claim 1 is pressed and is become device, it is characterized in that: on the shell between the output electrode hole 6 fluted 7.

4, neon light as claimed in claim 1 is pressed and is become device, and it is characterized in that: all there is semicircle louvre 8 two side at shell.

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