A startup control circuit for a positive temperature coefficient heater, an air conditioning system and an automobile

Abstract

The embodiment of the invention provides a positive temperature coefficient heater starting control circuit, an air-conditioning system and an automobile. The starting control circuit comprises a power supply, a relay, a first heating module, a first control switch, a second heating module, a second control switch, a third control switch, a detecting unit and a control unit. After an enabled instruction is received, the control unit controls the third control switch and the first control switch to connect, and receives a detecting value sent by the detecting unit; and when the detecting valueis less than a preset value, the third control switch and the first control switch are controlled to disconnect, and the relay and the second control switch are sequentially controlled to communicatewith the first control switch. According to the scheme of the embodiment, after the control unit receives the enabled instruction, the first heating module is controlled to connect with the second heating module in series, all-in resistance of the starting control circuit is increased, electric current is reduced, the influence on finished automobile voltage and starting and driving of the automobile is reduced, and the traffic safety is advantageously ensured.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a start-up control circuit of a positive temperature coefficient heater, an air-conditioning system and an automobile. Background technique [0002] With the improvement of the technical level of electric vehicles and the rapid development of the electric vehicle industry, electric vehicles are becoming more and more sought after by the masses. At the same time, the requirements for the safety of electric vehicles are also getting higher and higher. PTC (positive temperature coefficient, Positive Temperature Coefficient) heater, that is, the positive temperature coefficient heater performs heating, but when the positive temperature coefficient heater is started, the starting current is very large, which will cause the voltage instability of the whole vehicle and affect the electric vehicle. Starting and driving have a great influence, and there is a great safety risk. ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a start-up control circuit for a positive temperature coefficient heater to solve the problem of starting the positive temperature coefficient heater when the current air-conditioning system of an electric vehicle uses a positive temperature coefficient heater for heating. The large current can easily cause the voltage instability of the whole vehicle, which has a great impact on the starting and driving of electric vehicles

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