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Null-live wire circuit protection method and circuit as well as device using relay

A technology of circuit protection and relay, applied in the direction of circuit devices, emergency protection devices with automatic disconnection, emergency protection circuit devices, etc., can solve problems such as affecting loads and potential safety hazards of operators, and achieve good protection effects

Inactive Publication Date: 2012-07-04
SHENZHEN H&T INTELLIGENT CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, in the standby state, some external interference may affect the load, and there may be safety hazards for the operators when the machine is installed and debugged by the complete machine factory.

Method used

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  • Null-live wire circuit protection method and circuit as well as device using relay
  • Null-live wire circuit protection method and circuit as well as device using relay
  • Null-live wire circuit protection method and circuit as well as device using relay

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] as attached figure 1 As shown, the conventional relay protection circuit uses the relay RY104 as the main switch for circuit protection. RY104 is connected in series with the live wire. The neutral wires are connected in series for protection.

[0021] However, this connection method has a disadvantage: all loads will eventually be connected to the neutral line. At this time, the neutral line is equivalent to a common terminal. Although the neutral line is theoretically dead, it is safe. Yes, but in practical applications, especially in some abnormal situations, such as accidentally reversed the live and neutral wires, in this case, one end of the load is directly connected to the live wire. In this way, in the standby state, some external disturbances may affect the load. Moreover, when the machine is installed and debugged in the co...

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PUM

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Abstract

The invention provides a null-live wire circuit protection method using a relay. According to the null-live wire circuit protection method, the relay which is used as a main switch is connected in series with a null wire, loaded ends of a live wire are connected in series with the live wire through corresponding load switches, all the loaded ends of the null wire are connected in series with the null wire through the relay as the main switch. A relay protection circuit and a device with the adoption of the method not only keep former protection functions but also can supply better protection in a process of installation of a complete machine factory or a production test of a manufacture factory for producing controllers. If only the load switches are not switched on, no security accidents occur when an operator is careless to touch a load in the operation process. Furthermore, the improvement does not increase any cost.

Description

technical field [0001] The invention relates to a circuit protection method, circuit and device, in particular to a circuit protection method, circuit and device using a relay. Background technique [0002] When making home appliance control boards, especially for washing machines, refrigerators, electric ovens and other large home appliance control boards that have relatively high safety requirements for electromagnetic interference and use environments, for safety reasons, a relay is generally used as a control board. The main switch and the relay are connected in series with the live wires of all the loads and connected with the live wires of the loads. When the relay driving the load fails, the load and the live wire can be disconnected by disconnecting the relay as the main switch to protect the safety of the circuit. [0003] However, this method of neutral and live wire circuit protection has a disadvantage: all loads will eventually be connected to the neutral wire,...

Claims

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Application Information

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IPC IPC(8): H02H3/14
Inventor 邓宝宁
Owner SHENZHEN H&T INTELLIGENT CONTROL
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