CN2198042Y

CN2198042Y - AC powered high voltage discharging igniter

Info

Publication number: CN2198042Y
Application number: CN 94219927
Authority: CN
Inventors: 金宗维
Original assignee: BEIJING AUTOMATION TECHNOLOGY INST
Current assignee: BEIJING AUTOMATION TECHNOLOGY INST
Priority date: 1994-08-31
Filing date: 1994-08-31
Publication date: 1995-05-24
Anticipated expiration: 2004-08-31

Abstract

The utility model relates to an AC powered high voltage discharging igniter which is composed of an outer shell, a rectifier, a high-voltage generator, a spark plug connected with the output end of the high-voltage generator and a control circuit for controlling the work of the high voltage generator, wherein, the control circuit is composed of a differential input circuit, a series branch of photocouplers, and an oscillation controlling transistor and an oscillation maintaining transistor which are connected with the output end of the branch. The output of the oscillation controlling transistor and the oscillation maintaining transistor are both connected with the controlled end of the high-voltage generator. The utility model can be used for explosive coating devices, has the advantages of precise ignition time and large discharge current, can successfully solve the problems of unstable detonation and short service life of the spark plug caused by spark plug fouling and can detonate stably in the process of metal powder coating.

Description

AC powered high voltage discharging igniter

The utility model relates to the electrion igniter that is used for the material surface detonation flame spraying.

The electrion igniter that is used for the material surface detonation flame spraying is at present continued to use the igniter of automobile, aviation internal combustion engine more, and they all adopt direct current supply, thereby following defective is in use arranged:

1. discharge current is generally less than 2MA, can not stablize ignition in containing the atmosphere of metal dust;

Discharge time uncontrollable, influence service life of spark plug;

3. be not suitable for computer control.

The purpose of this utility model is that a kind of power output of design stablizes that adjustable, discharge current is big, can adjust in advance discharge time, thus the electrion igniter that detonation flame spraying equipment working stability, performance are improved.

The electrion igniter that the purpose of this utility model is achieved in that Alternating Current Power Supply is made up of shell, the rectifier that working power is provided, high pressure generator, the control circuit that is connected on the spark plug of said high pressure generator output and controls said high pressure generator work.Wherein: said control circuit is kept transistor by differential input circuit, optical coupler, the vibration control transistor that is connected on this optical coupler output and vibration and is constituted, the output of differential input circuit connects the input of optical coupler, and the controlled end that transistorized output all connects said high pressure generator is kept in vibration transistorized output of control and vibration.

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is circuit theory diagrams of the present utility model.

Circuit shown in the figure is made up of, wherein the control circuit of the full-bridge rectifier Q1 that working power is provided, high pressure generator, spark plug SP and the work of control high pressure generator:

The ac input end of rectifier Q1 is connected to wave filter L1 and L2;

High pressure generator is made up of the push-pull oscillator circuit of forming with transistor T 3, T4 and feedback transformer TR1, the output transformer TR2 that picks out from the efferent duct T3 of this push-pull oscillator circuit, the former limit serial connection REgulatable reactor L6 of this output transformer, secondary meets spark plug SP, and output transformer and reactor all adopt the ferrite permeability magnetic material.

Control circuit is kept transistor T 2 by differential input circuit, optical coupler G1, the vibration control transistor T 1 that is connected on optical coupler G1 output and vibration and is constituted, the output of transistor T 1 connects the base stage that is subjected to keyholed back plate T4 of push-pull oscillator circuit through trigger tube B1, and the output of transistor T 2 directly connects the base stage of T4;

The differential input circuit is the RC differentiator that is made of resistance R 5～R7 and capacitor C 8, its output connects the input of optical coupler G1, in the control impuls input I1～I4 of differential input circuit, I1 is the signal common, and I2, I3, I4 are respectively 5V Transistor-Transistor Logic level end, 12V CMOS level end, 24V switching value level end.

This circuit 150 * 100 * 50MM that packs into moulds in the shell, carries out sealed damp-proof after the drying and handles, by the control impuls input I1～I4 and the computer interconnection use of its differential input circuit.

Narrate its operation principle below:

Civil power produces about 300V dc source voltage on C2 behind full-bridge rectifier Q1.Push-pull oscillator circuit becomes the high-frequency alternating current of about 20KHZ with this DC voltage, and by output transformer TR2 voltage is promoted to more than the 26KV, outputs on the spark plug SP.Reactor L6 is in order to adjust and the restriction output current.C7 is a load capacitance, can improve electrical source power factor, and keeps the balance of voltage when static state.

Control impuls from computer comes becomes trigger impulse through the differential input circuit, again through optical coupler G1 output, makes T1 pipe and T2 pipe end.After the T1 pipe ends, the C3 energy storage, B1 is breakdown, and the T4 conducting produces vibration thereby cause push-pull oscillator circuit.After the T2 pipe ends, make the T4 pipe accept feedback voltage again and keep vibration.

When differential capacitance C8 in the differential circuit charge to saturated after, optical coupler G1 turn-offs, so power supply makes T1 pipe and the conducting of T2 pipe again, the C3 discharge with base, the emitter-base bandgap grading short circuit of T4, makes the failure of oscillations of T4 pipe.

Advantage of the present utility model and effect are:

Adopt alternating current to obtain the operating voltage more much higher than automotive ignition system supply voltage, so the step-up ratio that can make output transformer much smaller than the latter, makes output current much larger than the latter, promptly available small and exquisite element provides bigger power output; The REgulatable reactor of the Cai Yonging load current of exportable ideal stability again simultaneously.

The differential circuit that control circuit selects for use optical coupler to isolate, by adjusting differential capacitance each back length of discharge time that triggers of adjusting, can burn off spark plug discharging gap surface precipitation thing, the extending plug life-span; Optical coupler can reliably be isolated high pressure and control loop, computer control easy to use and not disturbed by forceful electric power.

The discharge current of this device can reach 8～10MA, can be controlled at discharge time in 2～100MS, directly uses Alternating Current Power Supply, no appendiron core transformer, and volume is little, in light weight, power is strong, can cooperate online with the multiple standard of computer.

This device is used for detonation flame spraying equipment, successful solution the igniting blasting problem of unstable that causes because of plug fouling, particularly in metal powder painting, can not stablize the problem of ignition; Spark plug life also can be prolonged by the automatic burn off of electric arc of suitable intensity greatly because of the incrustation on it; Accurate by the computer-controlled timing duration of ignition.

In other embodiment of the present utility model, differential circuit is connected on the output of optical coupler, and the input and the control impuls input I1～I4 of optical coupler joined, and effect is the same.In addition, differential circuit also can adopt inductive type or integrated circuit to realize.

Claims

1, the electrion igniter of Alternating Current Power Supply has shell, high pressure generator and the spark plug that is connected on the high pressure generator output, it is characterized in that: it also comprises rectifier that working power is provided and the control circuit of controlling high pressure generator work, said control circuit is by the differential input circuit, optical coupler, vibration control transistor and vibration are kept transistor and are constituted, the differential input circuit is connected with optical coupler, the input that transistor is kept in vibration control transistor and vibration all connects the output from differential input circuit and optical coupler series arm, and vibration control transistor and the output of keeping transistor of vibrating all connect the controlled end of high pressure generator.

2, the electrion igniter of Alternating Current Power Supply according to claim 1, it is characterized in that: said high pressure generator is formed by push-pull oscillator circuit and from the output transformer that the efferent duct of this push-pull oscillator circuit picks out, the former limit serial connection REgulatable reactor of said output transformer, secondary connects said spark plug; Said vibration is controlled transistorized output and is connect the input that is subjected to keyholed back plate of said push-pull oscillator circuit through trigger tube, and the input that is subjected to keyholed back plate that transistorized output directly connects said push-pull oscillator circuit is kept in said vibration.