CN101311631A

CN101311631A - Double needle united electronic impulse ignition apparatus flame checking scheme

Info

Publication number: CN101311631A
Application number: CNA2007101473125A
Authority: CN
Inventors: 朱德强
Original assignee: FOSHAN HUALIANXING ELECTRONIC Co Ltd
Current assignee: FOSHAN HUALIANXING ELECTRONIC Co Ltd
Priority date: 2007-05-25
Filing date: 2007-08-14
Publication date: 2008-11-26

Abstract

The invention discloses a flame detection scheme of an electron impulse flame lighter by using a discharge lamp to realize double-needle unification; in a lightering process, the sublevel of the T2 produces high pressure, which leads the discharge lamp to obtain electric breakdown strength to be punched and leads the high pressure discharging to form an integral loop. In the process of detecting flame, as the T1 secondary voltage is low and can not reach the electric breakdown strength of the discharge lamp, and then the T2 discharging needle breaks away from the ground. The characteristic of unilateral conduction of flame can be used for detecting that the positive semiwave can discharge electricity by flame; the negative semiwave has no electricity discharging loop and is accumulated in C2, which leads the voltage at the negative input terminal of a comparator to be lower than the voltage of the positive input terminal and leads the comparator to output low electricity level (carrying out overturning), thereby leading a singlechip to obtain fire signals. The scheme leads cooker to have low cost and smaller size.

Description

Double needle united electronic impulse ignition apparatus flame checking scheme

Technical field:

The present invention relates to a kind of electronic impulse ignition apparatus flame checking scheme of crosspointer unification.

Used predicate:

The crosspointer unification: so-called crosspointer unification is exactly the igniting pin on the igniter and feeds back the meaning that pin unites two into one.

Technical background

In the market no matter be that gas kitchen ranges igniter or its flame checking scheme of gas heater igniter can divide two big classes.One class is to use the thermocouple mode, it is to utilize pyroelectric effect, two kinds of different conductors or semiconductor are connected into the closed-loop path, when the temperature at two contact places not simultaneously, to produce thermoelectrical potential in the loop, whether flame detection circuit then has electric current to judge whether fire according to the loop, and its advantage is to install simply, and shortcoming is cost height and poor accuracy.

Another kind of is the mode of utilizing the ion flame, and it is a characteristic (its equivalent circuit is the resistance series connection of a diode and several megaohms) of utilizing the unilateal conduction of flame.Flame detection circuit has the potential difference of denying to judge whether to catch fire by detection, and its advantage is that cost relatively hot galvanic couple is low, and shortcoming is that trouble (it is made up of flame inductive needle, induction high-voltage line, clip and screw etc.) is installed.

These two kinds all exist shortcoming in sum, and the latter is although the relatively hot galvanic couple is cheap, but also want the cost about 4 yuan.In addition now because the building price is more and more higher, and the area in kitchen also diminishes accordingly, this just requires also relative little of kitchen tools, should decorate fiery pin and also will adorn the feedback pin and then be unfavorable for its littleization on a burner, and the cost requirement of household electrical appliances is more and more higher now.

Purpose of the present invention will make littleization of kitchen range become possibility exactly and cost becomes lower.That just is to use flame inductive needle that the mode of crosspointer unification will original flame feedback fraction, respond to high-voltage line, clip and screw saves, and makes kitchen range can become littler like this and cost also has certain decline.

Its operation principle is to add a discharge tube (discharge voltage is more than 200V) between the secondary and ground of high voltage package, when igniter in when igniting (step-up transformer shakes by force) since the voltage of high voltage package more than 10K, it can make discharge tube puncture and form discharge loop, but the voltage at discharge tube two ends does not reach 200V when detecting the fire combustion, discharge tube can not puncture and be equivalent to open circuit with ground, can form ion stream between igniting pin and ground and can examine the flame situation.

The present invention is further illustrated below in conjunction with accompanying drawing.

Operation principle is described as follows:

IC1 is single-chip microcomputer (also available discrete component mode is done igniting and flame detection circuit) among the figure.Power supply is input as two joint dry cell series connection.

In the time will lighting a fire, make the Q1 conducting by Single-chip Controlling, T1 is shaken by force, charge on storage capacitor C4 by the D1 rectification, Zener diode Z2 also obtains enough breakdown voltages and punctures when the voltage on the C4 is charged to about 120V, thereby makes unidirectional controllable silicon S R1 obtain trigger current and conducting.This moment, storage capacitor C4 discharged by the primary coil of controllable silicon SR1 and high voltage package T2, thereby secondary generation high pressure at T2, make discharge tube obtain breakdown voltage and puncture, simultaneously the air between the high-voltage breakdown of T2 igniting pin and ground and produce fiery arc (electrion forms complete loop like this).SR1 discharges by also again C4 being charged next time after C4 has discharged.

When flame detects: when no flame or when not having detection signal, the comparator output low level.Make Q1 turn-off the Q2 conducting by Single-chip Controlling, shake (this moment, T1 level both end voltage had only tens volts) a little less than making T1 enter, utilize the logical characteristic that exchanges of stopping direct current of electric capacity, by C2 direct required AC signal of acquisition flame detection on T1 secondary.This moment, Z2 can not get breakdown voltage, and R1 can promptly can not light a fire in conducting yet.In addition owing to the T1 secondary electrical force down do not reach discharge tube FDG breakdown voltage promptly this moment T2 spray point and ground between disconnect.Utilize flame that the characteristic of unilateal conduction is arranged, the positive half-wave that detects AC signal can discharge by flame, and negative half-wave discharge off loop and will accumulating on C2 makes the negative input end voltage ratio positive input terminal voltage of comparator low, makes comparator output low level (promptly overturning).Thereby make single-chip microcomputer obtain to have fiery signal.

Description of drawings:

Accompanying drawing is concrete circuit theory diagrams (this circuit only provides the circuit of igniting and feedback fraction) of implementing of the present invention.

Claims

1. the electronic impulse ignition apparatus flame checking scheme of crosspointer unification, its principal character is: the igniting pin of igniter and the shared pin of flame feedback pin, and it is to utilize the characteristic of the high-voltage breakdown of discharge tube to make the secondary wire bag of high voltage package and igniting ground be switched on or switched off, thereby satisfies the circuit requirement in ignition circuit and flame detection loop.