A kind of relay protection circuit and method

A technology for protecting circuits and relays, applied in the field of frequency converters, can solve problems such as burnout of contacts of on-board relays, and achieve the effect of safe and reliable disconnection

Active Publication Date: 2020-02-04
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a relay protection circuit and method, which solves the problem that the contacts of the onboard relay are burned when the compressor or the motor is running

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  • A kind of relay protection circuit and method
  • A kind of relay protection circuit and method
  • A kind of relay protection circuit and method

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] figure 1 A schematic diagram of a protection circuit of a relay provided in an embodiment of the present invention, such as figure 1 As shown, the protection circuit of the relay may include: a processor 11 , a switch module 12 and a control module 13 .

[0033] Wherein, the first end of the processor 11 is connected to the first end of the switch module 12, the second end of the switch module 12 is connected to the first end of the control module 13, and t...

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Abstract

The embodiment of the invention discloses a relay protection circuit and method, relates to the field of frequency converters, and solves the problem that contacts of onboard relays are burned when compressors or motors are running. The specific scheme is: the protection circuit of the relay includes a processor, a switch module and a control module; the first end of the processor is connected to the first end of the switch module, the second end of the switch module is connected to the first end of the control module, and the second end of the control module is connected to the first end of the control module. The two terminals are used to connect the relay; the second terminal of the processor is used to connect the power device; the control module is used to control the relay to be disconnected when the switch module is disconnected; the processor is used to detect when the power device is running The on-off state of the switch module, and after the off-time of the switch module is determined to reach the preset time, the power unit is controlled to stop; the preset time is less than the hysteresis separation time of the relay. The embodiment of the invention is used in the process of disconnecting the contacts of the relay under high voltage and high current.

Description

technical field [0001] The embodiments of the present invention relate to the field of frequency converters, and in particular to a relay protection circuit and method. Background technique [0002] In the prior art, frequency converters are widely used in air conditioners, refrigerators, washing machines and other equipment, and the AC contactor used to switch the bus current in the frequency converter can be replaced with an on-board relay to avoid wiring problems caused by the AC contactor. Too much leads to interference such as stray inductance. [0003] When the frequency converter is used in an air conditioner and the on-board relay is used to switch the current, if the refrigerant pressure in the pipeline exceeds the limit value when the compressor or motor is running, it means that the current in the circuit is large. At this time, the pressure switch (Pressure Switch, PSH) connected to the pipeline will be disconnected. Since the pressure switch is also connected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/18
CPCH01H47/002H01H47/18
Inventor 李希志沈乾军张俊喜赵晓青侯磊李光振林文涛
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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