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Relay zero crossing disconnection arc extinguishing method

A relay and zero-crossing technology, applied in the direction of relays, circuits, electrical components, etc., can solve problems such as easy breakdown of air, high cost, and impact on the life of relay contacts

Inactive Publication Date: 2010-07-28
罗静
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, when the contact of the lighting control relay is broken, due to the potential difference, a strong electric field will be generated on both sides of the contact, so it is easy to break down the air and form an arc, which has a great impact on the life of the relay contact
At present, the commonly used contact arc extinguishing technologies include: vacuum technology, relay complementary technology, etc., and the cost of these methods is relatively high

Method used

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  • Relay zero crossing disconnection arc extinguishing method
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  • Relay zero crossing disconnection arc extinguishing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Connect the mechanical relay to a 2000W lighting load, use the Hall current sensor to convert the AC current value with a voltage of 220V and a frequency of 50Hz into a low-voltage signal of 0-5V, and then measure it through the ADC port of the ATMEGA16 microcontroller to identify the current within 15ms after detecting the zero-crossing point of the current, at an interval of 0.01ms, the ATMEGA16 microcontroller sends a disconnection command to the mechanical relay, observes the relay contacts, and records the arc value; take the time corresponding to the minimum arc is the delay time t, and store the delay time t into the EEPROM of the ATMEGA16 single-chip microcomputer. In the future, each time a command needs to be sent to the relay to be disconnected, the zero-crossing point of the current is first detected, and then the delay time t is controlled by the ATMEGA16 single-chip microcomputer to disconnect. The last delay time set in this embodiment is 9.6ms.

Embodiment 2

[0019] Connect the mechanical relay to a 1000W lighting load, use the Hall current sensor to convert the 220V AC current value into a 0-5V low-voltage signal, and then measure it through the ADC port of the ATMEGA16 microcontroller to identify the zero-crossing point of the current; detect Within 15ms after the zero-crossing point of the current, at an interval of 0.1ms, the ATMEGA16 microcontroller sends a disconnection command to the mechanical relay, observes the relay contacts, and records the arc value; take the time corresponding to the minimum arc as the delay time t and The delay time t is stored in the EEPROM of the ATMEGA16 single-chip microcomputer. In the future, when a command needs to be sent to the relay to be disconnected, the zero-crossing point of the current is first detected, and then the delay time t is controlled by the ATMEGA16 single-chip microcomputer. The last setting in this embodiment The latency is 9.6ms.

Embodiment 3

[0021] Connect the mechanical relay to a 500W lighting load, use the mutual induction coil to convert the 220V AC current value into a low-voltage signal of 0-5V, and then measure it through the ADC port of the ATMEGA64 microcontroller to identify the zero-crossing point of the current; detect the current Within 15ms after the zero point, at an interval of 0.2ms, the ATMEGA64 MCU sends a disconnection command to the mechanical relay, observes the relay contacts, and records the arc value; the time corresponding to the minimum arc is taken as the delay time t and the delay time t is stored in the EEPROM of the ATMEGA64 single-chip microcomputer. When it is necessary to send a command to the relay to be disconnected every time in the future, the zero-crossing point of the current is first detected, and then the delay time t is controlled by the ATMEGA64 single-chip microcomputer. The delay time is the last setting in this embodiment is 9.6ms.

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Abstract

The invention discloses a relay zero crossing disconnection arc extinguishing method, belonging to the technical field of relay arc extinguishing. The essential technical scheme thereof comprises the following steps: (1) establishing a current measuring circuit for detecting current frequency; (2) after detecting the zero crossing point of the current, taking the corresponding time when an electric arc value is minimum as a delay time t, and recording the delay time t; and (3) as long as a command needs to be sent to a relay for disconnection, firstly, detecting the zero crossing point of the current and then disconnecting at the delay time t. The method of the invention has simple operation, convenience and practicality and can reduce and even eliminate electric arc at the moment when the relay is disconnected, thereby greatly prolonging the service life of relay contacts and being suitable for arc extinguishing of the relay.

Description

technical field [0001] The invention relates to a method for extinguishing an arc in a relay, and more specifically, to a method for extinguishing an arc when a relay is turned off when it crosses zero. Background technique [0002] At present, when the contact of the lighting control relay is broken, due to the potential difference, a strong electric field will be generated on both sides of the contact, so it is easy to break down the air and form an arc, which has a great impact on the life of the relay contact. Currently commonly used contact arc extinguishing technologies include: vacuum technology, relay complementary technology, etc., and the cost of these methods is relatively high. The alternating current is 50Hz, and its load is in resistive, capacitive, and inductive states, and the current shows a waveform characteristic of 50Hz. Therefore, if the relay can be controlled to make it break just at the current zero point, the relay contact can be broken at the moment...

Claims

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Application Information

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IPC IPC(8): H01H47/18
Inventor 罗静
Owner 罗静
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