CN101004588A

CN101004588A - Flame ions for testing ignition controller

Info

Publication number: CN101004588A
Application number: CN 200610003906
Authority: CN
Inventors: 苏颖耿
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-22
Filing date: 2006-01-22
Publication date: 2007-07-25

Abstract

An ignition controller with flame ion detection is prepared for setting voltage-limit components between secondary stage of high voltage head and grounding and arranging flame detection input loop at connection position of said voltage-limit component to make ignition needles simultaneously be as flame ion induction probe also, obtaining AC signal required in flame detection from said secondary stage, using CPU to stop oscillation for second if flame is detected, starting oscillation detection again and repeating above process cyclically.

Description

Flame ion detecting ignition controller

Technical field

The invention belongs to gas ignition control technology field, particularly a kind of flame ion detecting ignition controller that is used for gas ignition and possesses functions of flame detection.

Background technology

The gas igniter that possesses the flame ion measuring ability at present, a class flame inductive needle separates with the igniting pin, respectively with two independently probe carry out flame ion detection and light a fire.As the patent No. 91101566.3 " igniter capable of glowing again on flame-out ".Its IGNITION CONTROL is detected flare up fire by the flame ion probe and realizes.When flame ignition, the flame resistance that flame ionization forms changes detection loop total resistance value, and signal is used for the gating pulse high-pressure generating circuit and quits work after amplifying.This type of lighter is swift in response owing to adopt flame ion as induced signal, and probe structure is simple, and is than thermopair reliability height, easy to maintenance.But a probe, function singleness, complex structure are used in igniting and induction respectively.

Another kind of lighter discharge igniting and flame detect and use same probe, as the patent No. 95103398.0 " flame ion detecting ignition controller ", its pulsed high-voltage transformer high-voltage output line circle is in series with flame ion testing circuit input circuit, the igniting pin is a double as flame ion probe as flare up fire sampling end simultaneously, whether the flame detection circuit input circuit also is connected with power supply, have flame to exist to detect.Flame ion detects output terminal can be used for the control ignition loop.This type of lighter is because igniting pin and inducing probes unite two into one, and installation cost reduces, and reliability improves.But, its igniting high tension loop and flame directly connects because of detecting input circuit, when pulse firing, produce, the effluve loop must be detected the importation in loop by flame, will detect input circuit to the flame of the high sensitivity of needs and impact, and reduces the reliability that its flame detects.And because of it adopts series system, when the igniting pin is communicated with ground with ground short circuit or because of humidity, the voltage that the hi-line bag is produced will all be carried on the input circuit of flame detection, easily flame be detected the loop and cause damage.

The objective of the invention is provides a kind of combustion gas tool flame ion detecting ignition controller scheme that adopts single-chip microcomputer or customized logic device to realize control at the shortcoming that above-mentioned existing scheme exists.This programme can be realized the igniting pin simultaneously as the flame ion inducing probes, and can avoid be subjected to the lighting a fire damage of high pressure of ion detection loop, and is simple in structure, cost is low.

This programme detects the ignition circuit of loop, high voltage pulse generation loop, serial connection pressure limiting device by flame ion and method of attachment, the igniting pin of ion detection input circuit formed as the method for flame ion inducing probes simultaneously; Single-chip microcomputer or logical device control step-up transformer, shake by force when needing igniting, on storage capacitor, obtain high direct voltage one time through rectification, when high pressure rises to a certain degree, the voltage stabilizing diode conducting, the controllable silicon that trigger the loop trigger, thereby storage capacitor passes through the elementary discharge of high voltage package at the secondary acquisition igniting of high voltage package high pressure.Insert the pressure limiting device between the secondary and ground of high voltage package; and insert flame in the secondary and pressure limiting device junction of high voltage package and detect input circuit; constituting the T type connects; because of the pressure limiting device when the effluve with conducting; so the high-tension current loop is during pulse firing: the secondary upper end of the high voltage package-igniting pin-puncture air-ground-secondary lower end of pressure limiting device-high voltage package; the ceiling voltage that makes flame detection input circuit bear is no more than the forward voltage of pressure limiting device, thereby protection flame detects the loop.And when flame detects, because of detection signal voltage is lower than pressure limiting device forward voltage, the pressure limiting device manifests open-circuit characteristic, not to detection signal generation bypass, making flame detect loop signal passes through: flame detects input-high voltage package secondary-igniting pin-flame-ground, formation loop.Thereby realize that the igniting pin is simultaneously as the flame ion inducing probes.Because of effluve is an impulse form, in discharge time limit voltage device conducting, in case discharge off, the pressure limiting device reverts to open-circuit condition immediately, and the flame detection signal is by the secondary igniting pin that is added to of high voltage package, and whether can detect has flame to exist, whether the present invention just can detect in igniting has flame to exist, when testing flame, can stop igniting, reduce power consumption.

Scheme is further expanded, use electric capacity isolated DC signal to obtain flame at the defeated out secondary of step-up transformer and detect required AC signal to distribute to flame detection loop; Use the batch (-type) flame detecting method, after detecting flame, stop the vibration of a step-up transformer immediately, the vibration that a step-up transformer is opened in time-delay behind the certain hour is again carried out flame and is detected, as when failing to detect flame and certain time, thinks that flame extinguishes.

The invention has the beneficial effects as follows: the igniting pin is simultaneously as the flame ion inducing probes, and is simple in structure; Constitute the effluve loop by the pressure limiting device, can avoid be subjected to the lighting a fire damage of high pressure of ion detection loop; Whether have flame exist, when testing flame, can stop igniting if can detect in igniting, reduce power consumption; Use electric capacity to isolate to obtain flame detect required AC signal and with the shared step-up transformer of ignition section, cost simple in structure reduces; Use the batch (-type) flame detecting method, can reduce power consumption; Owing to use single-chip microcomputer or customized logic device to control, make batch product product time parameter consistent and stable, and can realize more complicated logic function.

Description of drawings

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

Fig. 1 is the circuit theory diagrams of a specific embodiments of the present invention.

Embodiment

CPU is a single-chip microcomputer among Fig. 1.Power supply is input as two joint dry cell series connection.Q3, Q4 are used to drive strong suction-keep valve.VR1, the VR2 voltage device of exceeding, using gases discharge tube, sparking voltage are greater than 150V but less than 250V, because of flame detection signal voltage is lower than 150V, so discharge tube shows open-circuit characteristic when flame detects, and ignition voltage is greater than 10KV, so the apparent short circuit curve of discharge tube during igniting.When the SW1 switch closure, circuit part obtains power supply, starts working.CPU shakes T1 by force by P50 mouth control Q6 conducting, obtains a sub-high pressure by the D1 rectification on storage capacitor C2.When the voltage on the C2 is raised to about 120V left and right sides, the voltage of trigger pip tap also is raised to enough puncture stabilivolt D9, trigger one-way SCR U1 conducting by R6, after the U1 conducting, electric energy on the C2 is released through controllable silicon U1 by the elementary winding of high voltage package HV1, thereby at the secondary generation high pressure of HV1, the high pressure warp: HV1 level upper end-left side igniting pin-igniting pin to the air-ground between ground-formation loop, VR1-HV1 level of discharge tube lower end, and at the pin of lighting a fire to the arc of lighting a fire of formation between ground.Utilize the characteristic every straight-through friendship of electric capacity, directly obtain flame on T1 level by C4 and detect needed AC signal, by R7 AC signal is added on the T contact, flame detects loop 3 and also is connected with the T contact by R8.When igniting, effluve is an impulse form, discharge tube VR1 conducting during discharge, the T point voltage is limited in below the 250V, and it is impaired to avoid flame to detect loop 3, and when the effluve end, discharge tube VR1 reverts to open-circuit condition rapidly, the flame detection signal is added on the left side igniting pin F1 by R7, high voltage package HV1 secondary coil, and the pin F1 that will light a fire detects pin as flame, and whether detect has flame to exist; Thereby whether this programme can detect in igniting and have flame to exist, and when detecting flame, CPU makes P50 mouth output high level, stops igniting.Detect at the catch fire flame of laggard row of point, the P50 mouth output high level of CPU, P51 mouth output low level makes the Q7 conducting simultaneously, owing to have R1, T1 to be operated in weak oscillatory regime, controllable silicon is not triggered and does not strike sparks little power consumption; Because discharge tube VR1 shows open-circuit condition to the flame detection signal, so the oscillator signal of T1 level acts on flame by C4, R7, HV1, F1.It is to utilize flame that the characteristic of unilateal conduction is arranged that flame detects, and the positive half-wave that detects AC signal will discharge by flame, and negative half-wave discharge off loop, so will on capacitor C 5, accumulate, make the comparer negative terminal voltage be lower than anode, thereby make the comparer upset, the output high level.And when no flame or when not having detection signal, the comparer output low level.After having detected flame, CPU stops the vibration 4 seconds of T1, and then opens oscillation test flame, so goes round and begins again.If can't detect flame in continuous 4 seconds, and think that then flame extinguished, valve-off.At the normal combustion state, detect flame and need 1 second time approximately, so the time of T1 vibration has only about 1/5 of continuous detecting mode, thus the electricity consumption of conserve batteries.When the SW2 switch open, working method is analogized.

Claims

1. flame ion detecting ignition controller scheme that is used for gas ignition and possesses functions of flame detection, detecting loop (3,6), high voltage pulse generation loop (1,4), the ignition circuit (2,5) of serial connection pressure limiting device (VR1, VR2) and the method for attachment (T) of ion detection input circuit by flame ion forms, and control by single-chip microcomputer (U1) or logical device, it is characterized in that: the secondary serial connection pressure limiting device (VR1, VR2) of high voltage package (HV1, HV2), flame detects loop (3,6) and inserts at its contact place (T); Igniting pin (F1, F2) is simultaneously as the flame ion inducing probes.

2. flame ion detecting ignition controller scheme according to claim 1 is characterized in that: use electric capacity (C3, C9) isolated DC signal to obtain every burner flame at a step-up transformer (T1, T2) out secondary and detect required AC signal to distribute to each flame detection loop.

3. flame ion detecting ignition controller scheme according to claim 2, it is characterized in that: use the batch (-type) flame detecting method, after detecting flame, stop the vibration of step-up transformer (T1, T2) immediately, open the vibration of step-up transformer (T1, T2) behind the time-delay certain hour again and carry out the flame detection, as when failing to detect flame and certain time, think that flame extinguishes.