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

Active Publication Date: 2020-05-19
HANGZHOU JIUYANG WATER PURIFICATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • A water purifier fault detection method and circuit
  • A water purifier fault detection method and circuit
  • A water purifier fault detection method and circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A water purifier fault detection method, such as figure 1 As shown, the water purifier includes: a system power supply 1, a load 2 and a first switch 3 for controlling the on-off of the load 2, and the fault detection circuit of the water purifier includes: a first resistor 4, a second resistor 5 , a Zener diode 6 and a main control chip 7; wherein, the system power supply 1, the load 2, the first switch 3 and the first resistor 4 are sequentially connected in series and then grounded; the Zener diode 6 is connected in parallel to the voltage sampling terminal of the main control chip 7 and ground between; one end of the second resistor 5 is connected to the voltage sampling end of the main control chip 7, and the other end is connected between the load 2 and the first switch 3; the control output end of the main control chip 7 is connected to the controlled output end of the first switch 3 The main control chip 7 is used to control the on-off of the load 2 by controlli...

Embodiment 2

[0062] Based on the first embodiment, this embodiment provides a specific solution embodiment for judging the short-circuit fault and open-circuit fault of the first switch 3 through the magnitude of the sampling voltage of the main control chip 7 .

[0063] Optionally, judging the short-circuit fault and open-circuit fault of the first switch 3 through the magnitude of the sampling voltage of the main control chip 7 may include:

[0064] When the load stops working, judge the short-circuit fault of the first switch by sampling the magnitude of the voltage; and,

[0065] In the load working state, the open circuit fault of the first switch is judged by the magnitude of the sampling voltage.

[0066] In the embodiment of the present invention, when the first switch 3 has a short circuit failure, the water purifier under the load 2 stop working state will be in an abnormal state; when the first switch 3 is open circuit fault, the water purifier under the load 2 working state Th...

Embodiment 3

[0083] On the basis of the first embodiment, this embodiment provides a specific solution embodiment for judging whether the load 2 is faulty and the magnitude of the fault according to the magnitude of the actual load current.

[0084] In the embodiment of the present invention, before the load 2 is fault judged according to the actual load current, the actual load current can be calculated through the voltage collected by the main control chip 7 , that is, the voltage at point B.

[0085] Optionally, calculating the actual load current according to the sampling voltage of the main control chip 7 includes: calculating the actual load current by the following equation:

[0086] I D =U / (R DS +R 1 +R N );

[0087] Among them, I D is the actual load current, U is the sampling voltage, and U is U B , R DS is the internal resistance of the first switch 3, R 1 is the internal resistance of the first resistor 4, R N It is a wire group connecting the connection end of the loa...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 王旭宁唐拥华
Owner HANGZHOU JIUYANG WATER PURIFICATION SYST
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