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Control method of relay with inductive load, and household appliance

A technology of relay control and inductive load, which is applied in the direction of program control, computer control, general control system, etc., can solve the problems of ignition and discharge, and achieve the effect of prolonging the service life, eliminating the phenomenon of discharge and ignition, and eliminating potential safety hazards

Active Publication Date: 2012-04-18
青岛海信网络能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a relay control method with an inductive load to solve the problem of ignition and discharge at the moment of opening and closing of the movable contact of the relay, and improve the safety of the operation of electrical products

Method used

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  • Control method of relay with inductive load, and household appliance
  • Control method of relay with inductive load, and household appliance
  • Control method of relay with inductive load, and household appliance

Examples

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Embodiment 1

[0024] Embodiment 1. In order to solve the problem that relays with inductive loads are prone to contact ignition and discharge at the moment of breaking, starting from the breaking sequence of the movable contacts of the relay, a current zero-crossing method for AC power supply is proposed. The control strategy of controlling the action of the movable contact of the relay at all times to avoid the charge stored on the inductive load from being applied to the movable contact of the relay, causing discharge and sparking at both ends of the contact.

[0025] The zero-current breaking method of the relay in this embodiment will be described in detail below from two aspects: the composition of the hardware circuit and the design of the software flow.

[0026] First of all, the basic hardware circuit configuration based on the zero-current breaking method of the relay is introduced, see figure 2 As shown, including relay J1, inductive load, processor MCU and AC voltage zero-crossi...

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Abstract

The invention discloses a control method of a relay with an inductive load, and a household appliance. A movable contact of the relay is connected with an alternating current power supply loop of the inductive load so as to execute on-off control on the alternating current power supply of the inductive load; while executing power off control on the inductive load, voltage zero crossing moment of the alternating current power supply is detected, after T*n+Delta T-T2, the power supply of a coil of the relay is cut off when the voltage zero crossing moment is detected, and the movable contact ofthe relay is controlled to act so as to cut off the power supply of the inductive load; FORMULA, wherein f is the frequency of the alternating current power supply; FORMULA is the power factor of theinductive load; T2 is the time from the moment when the power supply of the coil is cut off to the moment when the movable contact of the relay acts, and n is a natural number. In the method, the movable contact of the relay is controlled to act at the alternating current zero crossing moment, and power on and power off control for the inductive load is realized, thus, the sparking phenomenon of the relay at the cut-off moment of the movable contact is eliminated, and service life of the relay is prolonged.

Description

technical field [0001] The present invention belongs to the technical field of power supply control, and in particular relates to a control method designed for controlling the switching of inductive loads on and off at zero current and the control method Application of the method on household electrical appliances with inductive loads. Background technique [0002] Existing household appliances, such as air conditioners, widely use relays for load control, and most of the loads are inductive loads such as motors, which makes the contact ignition and discharge phenomenon often occur when the relay is switched off. The reason is: when the relay contact is disconnected, the capacitive voltage of the inductive load will increase, and at this time the distance between the contacts is very small, when the voltage at both ends of the contact increases to the point where the contact can be broken down When the air is released, the contacts are re-conducted, and the current flows th...

Claims

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Application Information

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IPC IPC(8): G05B19/042
Inventor 高思云陈建兵张新建
Owner 青岛海信网络能源股份有限公司
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