UPS zero line open circuit detection method and device and UPS

A technology of open circuit detection and neutral line, applied in the field of UPS, can solve the problem of high cost

Active Publication Date: 2018-09-21
KEHUA DATA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the detection method for the open circuit of the input neutral line of the inverter module 12 is generally to install a current transformer on the input neutral line cab

Method used

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  • UPS zero line open circuit detection method and device and UPS
  • UPS zero line open circuit detection method and device and UPS
  • UPS zero line open circuit detection method and device and UPS

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] The core of the present invention is to provide a UPS neutral line open circuit detection method, which is used to reduce the detection cost when detecting whether the input neutral line of the inverter module is open circuit. In addition, the present invention also provides a neutral line disconnection detection device and UPS. The method and device can be realized by the controller of the UPS itself, or can be realized by other devices...

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Abstract

The invention discloses a UPS zero line open circuit detection method and device and a UPS. The method comprises the steps that the phase voltage value inputted by a three-phase power supply and the voltage difference value between the positive DC bus and the negative DC bus are detected; whether the voltage difference value is within the preset theoretical calculation value range of zero line open circuit is judged; and if the judgment result is yes, the situation of zero line open circuit is determined, wherein the theoretical calculation value range is determined according to the type of the rectification module in the UPS and the phase voltage value. Therefore, the method can be realized based on the controller of the UPS. Compared with the mode of additional arrangement of the hardware in the prior art, additional arrangement of the hardware is not required by the method, the cost is low, and the method is simple in calculation logic and low in resource consumption of the controller. Besides, the UPS zero line open circuit detection device and the UPS also have the beneficial effects.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a UPS neutral line disconnection detection method and device, and the UPS. Background technique [0002] UPS is an important power supply device in the power electronics industry. It cooperates with the bypass power supply to realize uninterrupted power supply to the load. figure 1 A main topology structure diagram of a three-phase UPS provided for the prior art. like figure 1 As shown, the three-phase UPS mainly includes a rectifier module 10 , an electrolytic capacitor module 11 and an inverter module 12 . The three-phase AC power L1-L3 is rectified by the rectifier module 10 to obtain positive and negative DC bus voltages, and the inverter circuit 12 converts the DC power on the DC bus to an AC output, wherein the input and output of the inverter module 12 share the neutral line N. [0003] During application, when the input neutral line N of the inverter module 1...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/58
Inventor 刘艺超林圣雄叶柄
Owner KEHUA DATA CO LTD
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