A water purifier fault detection method and circuit

A fault detection circuit and fault detection technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of machines that cannot be automatically detected, poor consumer experience, machine accidents, etc., to achieve easy implementation, effective implementation, accurate high sex effect
CN107748305BActive Publication Date: 2020-05-19HANGZHOU JIUYANG WATER PURIFICATION SYST
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU JIUYANG WATER PURIFICATION SYST
Publication Date
2020-05-19

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Abstract

The embodiments of the invention disclose a fault detection method and circuit for a water purifier. The water purifier includes a system power supply, a load and a first switch. The fault detection circuit includes a first resistor, a second resistor, a voltage regulator diode and a main control chip. The system power supply, the load, the first switch and the first resistor are sequentially connected in series and then grounded. The voltage regulator diode is connected in parallel between the voltage sampling end of the main control chip and the ground. One end of the second resistor is connected with the voltage sampling end of the main control chip, and the other end is connected between the load and the first switch. The fault detection method includes the following steps: judging whether there is a short circuit fault or an open circuit fault in the first switch according to the magnitude of the sampling voltage of the main control chip and / or calculating the actual load currentaccording to the sampling voltage of the main control chip; and judging whether there is a fault in the load and the magnitude of the fault according to the magnitude of the actual load current. Through the scheme in the embodiments, low-cost and automatic fault detection on the water purifier is realized, and the safety and reliability of the water purifier are improved.
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Description

technical field

[0001] Embodiments of the present invention relate to water treatment equipment control technology, in particular to a water purifier fault detection method and circuit. Background technique

[0002] The current water purifier valves and pumps basically use relays or metal oxide semiconductor MOS tubes as control switches; when the valve or pump fails, the machine is under abnormal working conditions, such as water cut-off, water pressure is insufficient; when the switch device When there is a fault or a fault in the drive circuit of the switching device, the machine cannot automatically detect it, which may easily cause machine accidents or performance problems, and even cause safety hazards, and the consumer experience is not good. Contents of the invention

[0003] The embodiment of the present invention provides a water purifier fault detection method and circuit, which can realize low cost and automatic fault detection of the water purifier, and improv...

Claims

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