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Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source

A technology of AC regulated power supply and load capacity, which is applied in the field of testing and can solve problems such as redundancy, increased user costs, and failure of AC regulated power supply and load to work normally.

Active Publication Date: 2017-03-22
BEIJING DONGFANG MEASUREMENT & TEST INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When users choose UPS, in order to increase reliability, they often need to carry out large redundancy of capacity, which increases the cost of users. If the load is underestimated and the redundancy is not enough, there may be AC ​​stabilized power supply and load. Neither can work normally, which is absolutely not allowed in some important occasions

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  • Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source
  • Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source
  • Method and system for testing non-linear load capacity characteristic of alternating-current voltage-stabilized source

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Embodiment Construction

[0033] Attached below Figure 1-5 Explain the principle of the test method of the present invention.

[0034] The load impedance of a nonlinear load is not always a constant, it varies with other parameters such as voltage or time. figure 1 A schematic diagram of a standard reference non-linear load is shown, which includes a rectifier circuit composed of four diodes connected to the power supply, a capacitor C connected in parallel with the rectifier circuit, and a variable resistor R1 as a load.

[0035] Under nonlinear load conditions, after the sinusoidal voltage is output, the current will become non-sinusoidal due to the change of the load impedance parameters, and the voltage drop caused by the non-sinusoidal current will also affect the voltage waveform to change to a non-sinusoidal waveform. For a non-sinusoidal voltage u(t) and a non-sinusoidal current i(t) with a period of T=2π / ω, it can generally be decomposed into a Fourier series:

[0036]

[0037] in:

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Abstract

The invention relates to a method and system for testing a non-linear load capacity characteristic of an alternating-current voltage-stabilized source. The employed non-linear load includes a rectification circuit that is connected with a power supply and is formed by four diodes, a capacitor connected in parallel with the rectification circuit, and a variable resistor serving as a load. The method is characterized in that a power factor situation of a load is simulated by adjusting the resistor and the capacitor in the non-linear load; parameter measurement and analysis is carried out on the circuit; and then the non-linear load capacity of the alternating-current voltage-stabilized source is tested. Therefore, the power factor situation of the load can be simulated randomly and testing and verification of the non-linear load capacity of the alternating-current voltage-stabilized source can be realized.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a method and system for testing the nonlinear load capacity characteristics of an AC stabilized power supply. Background technique [0002] At present, a large number of manufacturers of AC regulated power supplies in China only use resistive loads or nonlinear electronic loads to complete the tests of basic functions and indicators. For some items that are difficult to test (such as nonlinear load capacity characteristic tests) there is no suitable test. method to give up. In actual work and life, the loads of regulated power supplies are mostly power supplies, PCs, etc., and the input circuits of these loads are generally nonlinear loads of diode rectifier bridges. If the manufacturer does not test the nonlinear load capacity of AC regulated power supplies such as UPS, the risk of use will be passed on to the user. When users choose UPS, in order to increase relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/42
CPCG01R31/40
Inventor 李树明宋海龙孙毅罗宇轩门伯龙罗震张若林
Owner BEIJING DONGFANG MEASUREMENT & TEST INST