Circuit for detecting power failure of three-phase mains supply
A technology of mains power failure and circuit, which is applied in the direction of continuity test, etc., can solve the problems of limited detection speed and high cost of mains power failure, and achieve the effect of low cost, simple circuit structure and fast determination
Pending Publication Date: 2021-04-16
DAYU ELECTRIC
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Problems solved by technology
It can be seen that this related technology can detect the abnormality of the mains power, but it is necessary to sample the mains voltage in real time and perform calculations on the sampled signals to determine whether the mains is powered off.
[0005] It can be seen that in the actual power-off detection process, sampling voltage or current still requires more hardware components and a certain sampling period, which leads to higher cost of mains power-off and limited detection speed
Method used
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[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.
[0024] The embodiment of the present application provides a circuit for detecting power failure of three-phase mains, which can quickly detect whether the three-phase mains is powered off, and has a simple circuit structure and low cost.
[0025] Such as figure 1 As shown, the embodiment of the present application provides a circuit fo...
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The invention relates to a circuit for detecting power failure of three-phase mains supply, which relates to the technical field of mains supply power failure detection and comprises three relays K. Each relay K comprises a coil L and a switch M. Each coil L is coupled between a zero line and a live line of three-phase mains supply, and the three switches M are connected in series to form a circuit. One end of the circuit serves as an input end to be connected to a power supply VCC, the other end of the circuit is grounded after being connected with a resistor R4 in series, the end, away from the grounding end, of the resistor R4 serves as an output end, and the output end is configured to output an electric signal. Whether the three-phase mains supply is powered down or not can be rapidly detected, the circuit composition structure is simple, and the cost is low.
Description
technical field [0001] The present application relates to the technical field of mains power failure detection, in particular to a circuit for detecting three-phase mains power failure. Background technique [0002] With the rapid development of industrialization, electrical equipment has higher and higher requirements for power supply reliability, and power supply reliability is closely related to the timely detection of power failure in the mains. [0003] Generally, the mains power failure detection circuit adopts two methods. One is to use the hardware circuit to divide, rectify, isolate and shape the three-phase mains to generate a power frequency square wave pulse, and then detect a power frequency Whether there is a pulse input in the frequency cycle to judge whether the power is off; the second is to use pure software to judge whether the power is off by sampling the three-phase mains and comparing it with the set threshold. However, both of these two types of metho...
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Inventor 李崇波毛康宇肖少兵王怡华
Owner DAYU ELECTRIC