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A short circuit detection method and device

A technology of short-circuit detection and thyristor, which is applied in the direction of measuring devices, measuring electricity, measuring electric variables, etc., can solve the problem of low accuracy

Active Publication Date: 2017-05-24
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The embodiment of the present invention provides a short-circuit detection method and device to solve the problem in the prior art that the accuracy of the short-circuit detection of the SCR used to isolate the mains and the battery is not high

Method used

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  • A short circuit detection method and device
  • A short circuit detection method and device
  • A short circuit detection method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Such as image 3 As shown, it is the first embodiment of the present invention for the UPS battery discharge line, which is connected to the L K A schematic diagram of any thyristor between the input terminal of the phase mains and the positive pole of the positive side battery or the negative pole of the negative side battery, and the method includes the following steps:

[0078] Step 101: Judging L K Whether the phase angle of the phase-to-mains voltage is J degrees, if yes, execute step 102, if not, continue the judgment, the K is 1, 2 or 3.

[0079] Said J is greater than or equal to 0 and less than or equal to 360. Preferably, said J is 0 or 180 in order to accurately determine the phase angle of the mains voltage.

[0080] Step 102: Sampling the voltage value of the battery corresponding to the thyristor at a set frequency, accumulating the sampled values, recording the sampling times, and executing step 103.

[0081] When the thyristor is connected to the posi...

Embodiment 2

[0106] Such as Figure 4 As shown, it is the second embodiment of the present invention for the UPS battery discharge circuit, which is connected to the L K A schematic diagram of a short circuit detection method for any thyristor between the input terminal of the phase mains and the positive pole of the positive side battery or the negative pole of the negative side battery. The method includes the following steps:

[0107] Steps 201 to 206 are the same as Steps 101 to 106 in Embodiment 1, and will not be repeated here.

[0108] Step 207: Determine whether the average voltage of the battery corresponding to the thyristor is greater than the second set threshold, if yes, execute step 209, if not, execute step 208.

[0109] The second set threshold is determined according to the lowest possible voltage of the positive-side battery under normal working conditions and the accuracy of detecting the voltage of the positive-side battery.

[0110] For example: Take a certain UPS as...

Embodiment 3

[0116] Such as Figure 5 As shown, for the UPS battery discharge circuit in the third embodiment of the present invention, it is connected to the L K A schematic diagram of a short circuit detection method for any thyristor between the input terminal of the phase mains and the positive pole of the positive side battery or the negative pole of the negative side battery. The method includes the following steps:

[0117] Step 301-Step 307: the same as Step 201-Step 207 in Embodiment 2, and will not be repeated here.

[0118] Step 308: The value of the thyristor counter and the stored V 1max Execute the clearing operation, and jump to step 301.

[0119] Step 309 : judging whether the value of the thyristor counter is 0, if yes, execute step 310 , if not, execute step 311 .

[0120] Step 310: Store the instantaneous voltage value V of the battery corresponding to the thyristor detected this time 1max , and execute step 311 or step 312.

[0121] Step 311: Determine the instanta...

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Abstract

The invention discloses a short-circuit detection method and device, the main contents of which include: determining the average voltage value of the battery corresponding to the thyristor to be detected within a commercial power cycle, and determining the instantaneous voltage value of the battery corresponding to the thyristor corresponding to the thyristor When the average voltage difference of the battery is greater than the first set threshold, it is determined that the thyristor is short-circuited; the instantaneous voltage value is detected when the voltage phase angle of the phase mains is W degrees. In the solution of the embodiment of the present invention, due to the utilization of the phase and amplitude relationship between the voltage of the battery and the voltage of the mains when the thyristor used to control the mains and battery isolation is short-circuited, it can be quickly compared with the prior art. Accurately detect whether the thyristor is short-circuited.

Description

technical field [0001] The present invention relates to the technical field of Uninterruptible Power Supply (UPS), in particular to a short circuit detection method and device. Background technique [0002] With the advancement of power electronics technology and the rapid development of the IT industry, people are increasingly aware of the important role UPS plays in protecting data. UPS has also been widely used in industries, communications, and family life. At the same time, more and more companies have put forward higher requirements for the stability of their own networks and data security. The demand for high-quality UPS has been greatly improved, which puts forward a new challenge to the quality of power supply. higher requirement. [0003] In the UPS battery discharge circuit, the thyristor (Silicon Controlled Rectifier, SCR) plays the role of isolating the mains and the battery and controlling the battery discharge. When the mains supply power, if the SCR is shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 资志翔
Owner VERTIV CORP