An ignition and detection circuit and a gas device

Abstract

The invention provides an ignition and detection circuit and a gas device. The circuit includes: an ignition circuit, including a third power supply terminal, a high-voltage discharge needle and an air discharge tube connected to the two ends of the third power supply terminal and acting on the casing; the air discharge tube The other end is connected with the casing; the control circuit includes an ignition control end that receives the ignition signal and a switch circuit that turns on the third power supply end after receiving the ignition signal; The fire pin is connected to the third resistor; the other end of the third resistor is connected to the casing; the amplifying circuit includes an operational amplifier, two input terminals of the operational amplifier are connected to both ends of the third resistor, and the output terminal outputs a detection signal. With such a design, the presence and size of the flame can be detected by outputting the detection signal through the output terminal of the amplifying circuit; and the ignition control is realized through the ignition control terminal; only two chip IO ports are needed to both ignite and detect the presence and size of the flame , saving chip resources and cost.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to an ignition and detection circuit and a gas device. 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 usually include ignition and detection circuits. The ignition and flame detection circuit needs to be compatible with the dual functions of ignition and flame detection, which is very important for gas equipment. [0003] The principle design of pulse ignition and flame detection is similar. At present, one needle is commonly used for ignition and one needle for flame detection. The ignition needle and fire detection needle respectively control their respective functions. The structure of the double-needle ignition and fire detection burner is relatively complicated; the controller Two output ports are required to control the ignition module and the fire...

AI Technical Summary

Problems solved by technology

[0003] The principle design of pulse ignition and flame detection is similar. At present, one needle is commonly used for ignition and one needle for flame detection. The ignition needle and fire detection needle respectively control their respective functions. The structure of the double-needle ignition and fire detection burner is relatively complicated; the controller Two output ports are required to control the ignition module and the fire detection module separately, and one input port is used to receive the detection signal of the fire detection module, which has certain requirements for the controller chip resources

[0004] And the ignition detection circuit in the prior art often can only detect the presence or absence of the flame, and cannot detect the size of the flame

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