Three-phase power protection circuit, and control method of the three-phase power protection circuit
A technology for protecting circuits and three-phase power supplies, which is applied in the field of circuits and can solve problems such as equipment failure and partial damage to switching power supplies, and achieve the effects of good safety and protection of loads and components
Active Publication Date: 2018-01-16
GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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Problems solved by technology
In the three-phase four-wire power supply equipment of the related art, the switching power supply is often powered by one of the live wires and one neutral wire, that is, 220V power supply. When 220V is wrongly connected to 380V power supply, the switching power supply part will be damaged immediately, so that the equipment will not work
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[0037] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0038] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the protection scope of the present invention is not limited to the specific details disclosed below. EXAMPLE LIMITATIONS.
[0039] The embodiment of the first aspect of the present invention proposes a three-phase power supply protection circuit, Figure 1a and Figure 1b A schematic structural diagram of the three-phase powe...
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The invention provides a three-phase power protection circuit, and a control method of the three-phase power protection circuit. The three-phase power protection circuit includes a first thermistor, afiltering circuit and a control chip, wherein the first thermistor is connected between a phase voltage wire and a first rectification circuit; the filtering circuit is connected between the first rectification circuit and a switch power supply; one end of the control chip is connected with the first output terminal of the switch power supply, and the other end of the control chip is connected with a zero line protection circuit and a first relay; when the first relay is not closed, the first thermistor turns on the circuit to charge an electrolytic capacitor on the filtering circuit; the filtering circuit is used for filtering and improving the adaptability in the voltage range; and the control chip is used for controlling the first relay and the zero line protection circuit. The three-phase power protection circuit can avoid the problem that the switch power supply is easy to damage during the line voltage power supply process or the overvoltage power supply process.
Description
technical field [0001] The invention relates to the field of circuit technology, in particular to a three-phase power protection circuit and a control method for the three-phase power protection circuit. Background technique [0002] In the application of three-phase four-wire power supply, there are load devices powered by 220V phase voltage, that is, one of the live wires and one neutral wire supplies power, but it may also be connected to two live wires, missing neutral wire or missing live wire. In the three-phase four-wire power supply equipment of the related art, the switching power supply is often powered by one of the live wires and one neutral wire, that is, 220V power supply. When 220V is wrongly connected to 380V power supply, the switching power supply part will be damaged immediately, so that the equipment will not work. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art or ...
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Inventor 温永和
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD