Power supply and relay state detection circuit and method
A state detection and relay technology, applied in the field of electric energy meters, can solve the problems of complex circuit structure, high raw material cost and high production and processing cost
Active Publication Date: 2019-12-13
WAHLAP TECH CO LTD
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Problems solved by technology
[0003] In view of this, the purpose of the present invention is to provide a power supply and relay state detection circuit and method, to alleviate the technical problems of complex circuit structure, high raw material cost and production and processing cost in the prior art
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[0044]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0045] At present, in the prior art, the state detection circuit of the power supply of the electric energy meter and the internal relay is not only complicated in circuit structure, but also has high raw material cost and production and processing cost. Based on this, a power supply and relay state detection circuit and The method can simplify the detection circuit and reduce the cos...
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The invention provides a power supply and relay status detection circuit and method. The circuit comprises: a first sampling terminal for receiving a direct-current voltage signal after power supply voltage of an electricity meter is rectified and filtered; a second sampling terminal connected with a normally closed terminal of a relay in the electricity meter; a divider resistor for dividing voltage of the direct-current voltage signal; an optical coupler that is used for opening or closing a high-level signal output by a pull-up resistor through a pull-up node under control of an output signal of the divider resistor, and for outputting a low-level signal to a processor when the high-level signal output by the pull-up resistor is closed; the pull-up resistor that is used for outputting ahigh-level signal to the processor in response to the control of the pull-up node; the processor that is used for determining statuses of the power supply and relay according to the high-level signalor low-level signal as well as power-up status or low-consumption status. The power supply and relay status detection circuit is simple in structure, with material cost and production and processingcost reduced.
Description
technical field [0001] The invention relates to the technical field of electric energy meters, in particular to a power supply and relay state detection circuit and method. Background technique [0002] figure 1 Circuit diagram for detection of power supply and relay status for prior art, such as figure 1 As shown, the prior art sampling terminals are power supply L and N, the front end of optocoupler 25 is composed of resistor 23, resistor 24, resistor 22, resistor 21 and patch diode 27, and the rear end of optocoupler 25 is composed of pull-up resistor 26 and filter Capacitor 28 is formed. In the positive half cycle of the sine wave, the voltage is from L to N through resistor 23, resistor 24, chip diode 27, resistor 22, and resistor 21. At this time, the optocoupler 25 is not turned on, and the RELAY is pulled up to VCC by the pull-up resistor 26, and the CPU detects to the RELAY pin is high level; in the negative half cycle of the sine wave, the voltage is from N to L...
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IPC IPC(8): G01R35/04
Inventor 蒋丽娜曾招辉李家成
Owner WAHLAP TECH CO LTD