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DC contactor sticking detection device and method

A technology of DC contactor and detection device, applied in the direction of measurement device, circuit breaker test, instrument, etc., can solve the problems of large error and high cost, achieve accurate detection, low-cost detection, and solve the effect of complex adhesion detection circuit

Active Publication Date: 2020-08-11
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The embodiment of the present invention provides a DC contactor adhesion detection device and method to at least solve the technical problems of high cost and large error caused by the complexity of the DC contactor adhesion detection circuit in the related art

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  • DC contactor sticking detection device and method
  • DC contactor sticking detection device and method
  • DC contactor sticking detection device and method

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The invention discloses a device and method for detecting the adhesion of a DC contactor. The device comprises a DC contactor, a photoelectric coupler and a micro control unit (MCU), wherein the DC contactor is controlled to be on or off through a positive temperature coefficient (PTC) thermistor powered by high-voltage direct current, the DC contactor, the PTC thermistor and the photoelectric coupler are sequentially connected in a DC power supply circuit in series, and the MCU is used for detecting whether the DC contactor is adhered or not according to a level signal outputted by the photoelectric coupler on the basis of the state of an isolation end. The device solves the technical problems of high cost and great error caused by the complexity of a DC contact adhesion detection circuitin the related art.

Description

technical field [0001] The invention relates to the field of automobile air-conditioning control, in particular to a DC contactor adhesion detection device and method. Background technique [0002] A positive temperature coefficient thermistor (Positive Temperature Coefficient, referred to as PTC), as a semiconductor heating device, performs electric auxiliary heating when the air conditioner is heating. However, during the working process, the DC contactor that controls the on-off of the high-voltage PTC often sticks, resulting in damage to the heating effect of the air conditioner. For example, in the related technologies of bus air conditioners, there are basically three types of anti-sticking measures for DC contactors for controlling high-voltage PTC on-off: [0003] (1) Current protection based on the current sensor, but due to the large current specification, the cost is high. [0004] (2) Judging whether there is adhesion based on the PTC outlet air temperature. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 孙磊宋爱程海松戴彪
Owner GREE ELECTRIC APPLIANCES INC