Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor

A technology of AC power supply and AC voltage, applied in the direction of power supply testing, emergency protection circuit devices, electrical components, etc., can solve the problems of complete machine product failure, permanent magnet demagnetization, damage to inverter components, etc., to improve reliability and prolong service life Life, reduce the effect of demagnetization

Active Publication Date: 2013-01-30
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This detection time t is sufficient for ordinary AC power detection applications, but it is not enough for applications such as DC inverter air conditioners that use inverter power
Because at the moment of AC power failure, if the corresponding protection measures cannot be detected and im

Method used

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  • Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor
  • Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor
  • Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor

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Example Embodiment

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] This embodiment first takes a DC inverter air conditioner as an example to briefly introduce the generation principle of the inverter power supply required by the DC inverter compressor.

[0029] See image 3 As shown, the DC inverter compressor adopts the AC-DC-AC power inversion principle, that is, after the input AC power is rectified into a DC power supply through a rectifier circuit, it is output to a filter circuit composed of electrolytic capacitors C1~C3 in parallel Perform filtering processing to generate DC bus voltage and input to the inverter circuit. The inverter circuit receives the PWM trigger signal output by the processor MCU, and then inverts the DC bus voltage into a three-phase AC voltage with variable three-phase frequency and adjustable voltage amplitude, and outputs it to the DC inverter compressor to control the com...

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Abstract

The invention discloses a poweroff detection method of an alternating current power supply and a poweroff protection method of a direct current inverter compressor. A wave form of alternating voltage of the alternating current power supply is detected, and when an absolute value of an amplitude value of the alternating voltage is less than a protection threshold Vp and the duration exceeds the set hold time T, the alternating current power supply is determined to be powered off, wherein when the hold time T is normally greater than the alternating voltage, the experienced dead time from -Vp to +Vp or from +Vp to -Vp before and after zero is t0. The poweroff detection method of the alternating current power supply can be used for detecting the alternating current power supply in real time, detecting the instantaneous poweroff condition of the power supply within short time, quickly reacting to the control of a controlled object, and implementing quick protection. When the method is used for poweroff protection of the direct current inverter compressor, a power supply inverter and the direct current inverter compressor can be effectively protected, thereby improving the reliability of a product and prolonging the service life of the product.

Description

technical field [0001] The invention belongs to the technical field of power supply detection, and in particular relates to a detection method for detecting whether an AC power supply is cut off and a power failure protection method for a DC frequency conversion compressor designed using the detection method. Background technique [0002] AC mains or three-phase power failure detection is not a new technology, and has been widely used in various fields such as industry and agriculture. For example: in the field of aquaculture, if the power is cut off for a long time, the oxygen supply of the water body is insufficient, which will cause a large number of fish and shrimp to die; in the field of cold storage, once the cold storage is powered off, it will affect the shelf life of the stored products; In the field of management, once the computer room is powered off, the UPS power supply is required to start immediately to meet the continuous power demand of the computer room, et...

Claims

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Application Information

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IPC IPC(8): G01R31/42H02H7/122
Inventor 尹发展王志刚陈建兵
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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