Test system and method for smoothing reactor inductance

Abstract

The invention provides a test system and method of the inductance value of a smoothing reactor. The test system of the inductance value of the smoothing reactor includes a voltage regulator for regulating voltage, an isolation step-down transformer, a rectifier bridge for converting alternating current into direct current, a first filtering inductor, a second filtering inductor, a first current limiting inductor, a second current limiting inductor, a connecting port for connecting a tested smoothing reactor, a first switch, a second switch, a third switch, a first blocking capacitor, a second blocking capacitor and an RCL bridge tester. According to the test system and method of the invention, the characteristics that inductors can conduct direct current and block alternating current and capacitors can conduct alternating current and block direct current are ingeniously utilized, so that direct current can be successfully applied to the tested smoothing reactor and will not flow into the RCL bridge tester, and high-frequency carriers can be applied to the tested smoothing reactor and will not flow into a power grid end, and therefore, the inductance value of the smoothing reactor can be measured. The test system and method have high measurement precision.

Description

technical field [0001] The invention relates to the field of electronic devices, in particular to a testing system and method for the inductance of a smoothing reactor. Background technique [0002] The smoothing reactor is used in the DC circuit after rectification. The pulse number of the rectifier circuit is always limited, and there are always ripples in the output DC voltage. This ripple is often harmful and needs to be suppressed by smoothing reactors. The converter stations of DC transmission need to be equipped with smoothing reactors to make the output DC close to the ideal DC; in the charging pile of new energy vehicles, smoothing reactors are also essential to filter out its high-frequency PWM. Control the high frequency ripple after rectification. Therefore, the smoothing reactor is one of the important components of the power electronics industry. [0003] The inductance of the smoothing reactor is its core electrical parameter. Most of the existing test met...

AI Technical Summary

Problems solved by technology

If you have in-depth research on DC reactors, you will know that the DC magnetization curve of the reactor core is completely different from the AC magnetization curve. Therefore, the DC inductance tested by the first method above is not accurate, and sometimes there is a big difference. Big

The second method above uses RCL to measure directly, only to measure its no-load inductance, not the inductance at rated current, and what users often need is the inductance at rated current

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