Ignition and detection circuit and gas wall-hung boiler based on boost principle

Abstract

The invention discloses an ignition and fire detection circuit based on a BOOST principle and a gas wall-hanging stove. The ignition and fire detection circuit comprises a controller and an ignition module; the ignition module comprises a boosting and detecting unit; and the boosting and detecting unit is connected with an external direct-current power source to be used for maintaining an ignitionpower source at a set voltage, and meanwhile a detected ignition voltage of the ignition power source is fed back to the controller. The ignition and fire detection circuit based on the BOOST principle and the gas wall-hanging stove eliminate the inductance squealing problem, a high voltage of the ignition power source is isolated from a controller chip, and the safety of the circuit is improved;the ignition module and a flame detection module share one boosting circuit, and the circuit cost is lowered; and a comparator is adopted for outputting a flame parameter signal, an I / O port connected with a flame detection signal is changed into a common detection port from an analog (AD) detection port, a detection signal is more accurate, and difficulty is greatly lowered during hardware design and software programming.

Description

technical field [0001] The invention relates to a gas ignition circuit, in particular to a pulse ignition and detection circuit based on the BOOST principle and a gas wall-hung boiler using the circuit. Background technique [0002] Gas equipment such as gas water heaters, gas hot air stoves, gas boilers, gas wall-hung boilers, etc., the circuits of these products include ignition and flame detection circuits. When igniting, the direct current needs to be boosted. After boosting, the voltage of the ignition power supply needs to be fed back to the controller, and the controller performs closed-loop control. Inductance, the main component of the current step-up, generates high voltage by energizing and discharging the inductance; in addition, a sampling circuit using resistor divider is used to feed back the voltage of the ignition power supply to the controller. Such a circuit has the following defects: 1. The noise is relatively large when the inductor passes through the h...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of inductance howling when the inductance passes high-frequency current in the prior art, the present invention proposes a pulse ignition and detection circuit based on the BOOST principle and a gas wall-hung boiler using the circuit

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