CN2689646Y

CN2689646Y - Electronic stabilizing device of vehicle headlight

Info

Publication number: CN2689646Y
Application number: CN 200420004541
Authority: CN
Inventors: 林再福; 李清然; 陈新得
Original assignee: HENGSHAN ELECTRONICS CO Ltd
Current assignee: HENGSHAN ELECTRONICS CO Ltd
Priority date: 2004-02-19
Filing date: 2004-02-19
Publication date: 2005-03-30
Anticipated expiration: 2014-02-19

Abstract

The utility model relates to an electronic stabilizing device of a vehicle headlight which is designed by a three-stage architecture. The electronic stabilizing device of the vehicle headlight comprises a pressure boost converter, a pressure reduction converter, a DC-AC converting circuit and an ignition circuit. The purpose of controlling the power can be easily achieved by matching a suitable control integrated circuit. Simultaneously, the electronic stabilizing device of the vehicle headlight also has the instant heat activation. Various protecting functions can be added without complex control circuits and checking assembly to satisfy the design requirement of the electronic stabilizing device of vehicle xenon lamp with high efficiency and low cost.

Description

The auto bulb electric stabilizer

Technical field

It is the auto bulb electric stabilizer of design basis with the three-level structure that the utility model relates to a kind of.

Background technology

High-intensity gas discharge lamp has been widely used in the light source of every indoor and outdoor lighting equipment at present, because luminous intensity, efficient, life-span and the color rendering of this lamp are good than Halogen lamp LED all, in recent years in each senior car type, brought into use the light source of high-intensity gas discharge lamp as auto bulb, so that high-quality lighting source to be provided, therefore automobile is called xenon lamp again with mainly being based on high-pressure xenon in the gaseous discharge lamp fluorescent tube.Domesticly at present still belong to the starting stage at automobile with the design of xenon lamp electronic ballast, domestic employed stabilizer all need be dependent on external import, and costs an arm and a leg.

The circuit that present automobile-used xenon lamp electric stabilizer adopts is mostly formed alternating-current converter and firing circuit with flyback converter, full-bridge type direct current, though this kind circuit framework is comparatively simple, but because of power supply on vehicle voltage and xenon lamp steady state working voltage at a distance of having ten times more than approximately, therefore the efficient of flyback converter is low, therefore lose higher, cause the electric stabilizer temperature to raise, and reduce its life-span.

Summary of the invention

The purpose of this utility model provides an xenon lamp electric stabilizer of the automobile with transient heat mobilizing function, can improve whole efficiency and reduce loss.

The utility model can be dealt with the automobile power source change, still can provide constant power to give load under different supply voltages, to improve the stability of product.

Above-mentioned purpose of the present utility model is achieved in that a kind of auto bulb electric stabilizer, it is characterized in that comprising: an electromagnetic interference filter circuit is connected in power input; One boost converter is connected in after the filter circuit, is made up of push-pull transistor, step-up transformer and rectifier diode and filter capacitor; One step-down controller is connected rectification circuit and direct current between the ac conversion circuit; One direct current is connected between step-down controller and the load circuit ac conversion circuit, provides AC square wave current to the automobile xenon lamp; One firing circuit comprises extra winding, capacitor and the spark discharge switch of boost converter; One control integrated circuit is connected between power input and the step-down controller, according to the size of the supply voltage of the input on-state rate with the control step-down controller, reaches the purpose of deciding power control; By the combination of above circuit, can make the DC decompression change-over circuit of control operate in the discontinuous current pattern, make the conversion crystal in the zero current switched conductive, can reduce switch cost, raise the efficiency.

The utility model is elaborated with instantiation below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is a circuit framework square of the present utility model;

Fig. 2 is a circuit diagram of the present utility model;

Light tube electric voltage, electric current and power waveform figure when Fig. 3 is the utility model use stable state.

Description of reference numerals: 1-battery tension; The 2-filter circuit; The 3-voltage up converting circuit; The 4-decompression converting circuit; The 5-direct current is to ac conversion circuit; The 6-firing circuit; The 7-xenon lamp; The 8-control integrated circuit; Inductance L f, Lb; Capacitor C f, Cdc, Cb; Diode D1, D2, Db; Transformer T1.Drive circuit 30; Drive circuit 50.

Embodiment

See also the utility model circuit framework calcspar shown in Figure 1 and circuit diagram of the present utility model shown in Figure 2, the utility model mainly is to use 12V battery tension 1 via a filter circuit 2 filtering electromagnetic interference in automobile, boost, send into step-down controller 4 after rectification and the filtering by boost converter 3, this step-down controller 4 is made up of crystal switch pipe Qb, diode Db and inductance L b and capacitor C b, one full-bridge type direct current places ac conversion circuit 5 after the step-down controller 4, and it is made up of crystal switch pipe Q3, Q4, Q5 and Q6 and drive circuit 50; One high-tension igniton circuit 6 is connected in series in the ac output end of direct current to ac conversion circuit 5 with xenon lamp 7, produces high voltage to light xenon lamp 7; One control integrated circuit 8 is connected between power input and the step-down controller.

The operation principle of the utility model circuit is as described below: the supply voltage of filter circuit 2 filtering that will be formed via inductance L f and capacitor C f; send into the push-pull type voltage up converting circuit 3 of electric current pattern; (this drive circuit 30 can be the bifurcation square-wave oscillator circuit to utilize drive circuit 30; two ends are alternately exported high/low level and are transported to the grid of Q1 and Q2 respectively; to drive Q1 and Q2 alternate conduction) mode that drives crystal switch pipe Q1 and Q2 alternate conduction promoted the automobile storage battery voltage 1 of 12V through transformer T1; again with diode D1 and diode D2 rectification; capacitor C dc is filtered into high-tension direct voltage; this direct voltage must be higher than the stable state light tube electric voltage value of maximum possible; again this direct voltage is transferred to crystal switch pipe Qb; inductance L b; the step-down controller 4 that diode Db and capacitor C b form is made Current Control; the electric current of this control is mainly xenon lamp 7 provides a stable electric current; b operates in the discontinuous current pattern with the energy storage component inductance L; can reduce the loss of crystal switch pipe Qb; it is last that (this drive circuit 50 can be the bifurcation square-wave oscillator circuit via drive circuit 50 with this controlled stabling current again; high/low level is alternately exported at two ends; to drive Q3; Q6 and Q4; the Q5 alternate conduction; wherein Q3 is connected an end of oscillating circuit with Q6 by going between; Q4 is connected the other end of oscillating circuit with Q5 by going between) to drive crystal switch pipe Q3; Q4; the direct current that Q5 and Q6 formed converts alternating current to ac conversion circuit 5; can be connected to xenon lamp 7 two ends of load; obtain a stable ac square-wave voltage and a current waveform (as shown in Figure 3); firing circuit 6 is a power supply with the extra winding of boost converter 3; cooperate transformer T1; capacitor C dc and spark discharge switch; generation reaches instantaneous function of lighting a lamp up to the high voltage more than the 25kV; control integrated circuit 8 is controlled the on-state rate of step-down controller 4 according to the size of the supply voltage of input; to reach the purpose of deciding power control; in addition, control integrated circuit 8 also can be implemented the control of lighting a lamp; the supply voltage reversal connection; electric light such as does not connect at defencive function.

In sum, the utility model cooperates three grades of automobile xenon lamp electric stabilizers that circuit framework is realized forming with control integrated circuit, the function that it not only can be reduced the loss, raise the efficiency, can reach the purpose of deciding power control by integrated circuit simultaneously, can improve the product stability again, lower the influences that problem caused such as heat generation.

Claims

1, a kind of auto bulb electric stabilizer is characterized in that comprising:

One electromagnetic interference filter circuit is connected in power input;

One boost converter is connected in after the filter circuit, is made up of push-pull transistor, step-up transformer and rectifier diode and filter capacitor;

One step-down controller is connected rectifier diode and direct current between the ac conversion circuit;

One direct current is connected between step-down controller and the load circuit ac conversion circuit, provides AC square wave current to the automobile xenon lamp;

One firing circuit comprises extra winding, capacitor and the spark discharge switch of boost converter;

One control integrated circuit is connected between power input and the step-down controller, controls the on-state rate of step-down controller according to the size of the supply voltage of importing.