Current output mechanism and test device

Abstract

The invention relates to a current output mechanism and a test device. The test device comprises a current booster and the current output mechanism. An input terminal of the current booster is connected with an external power supply, and an output terminal of the current booster is connected with the current output mechanism; the current output mechanism comprises a first output unit and a second output unit, a containing cavity is defined by the first output unit, the output end of the second output unit is inserted into the containing cavity, the output end of the second output unit is connected with the inflow end of the first output unit, and the first output unit and the second output unit jointly form a closed loop; the second output unit is used for being matched with the first output unit to shunt the current in the closed loop; by arranging the first output unit and the second output unit, current shunting in the closed loop is realized, so that resistance and inductance in the closed loop are reduced, inductive reactance of the closed loop is further reduced, and apparent power of the power supply is reduced.

Description

technical field [0001] The invention relates to the technical field of current output test devices, in particular to a current output mechanism and a test device. Background technique [0002] At present, there is a power frequency short-time overcurrent withstand test in the testing items of some power electronic equipment such as current monitoring devices, current transformers and other products, and the test current is generally high. In a high current loop, the inductive reactance of cables or copper bars has a great influence. [0003] The traditional high current output device includes power input, current booster, output copper bar, connection terminal and test output piece. The power input improves the current output capability through the current booster, the output end of the current booster is connected to the connection terminal through the output copper bar, and the end of the connection terminal away from the output copper bar is connected to the test output ...

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Problems solved by technology

[0004] However, under strong current, the resistance of the loop (that is, the internal resistance of the current booster coil, the resistance of the output copper bar, the test output and the cable resistance of the test output and the connecting terminal) can be reduced by increasing the cross-sectional area of ​​the output copper bar, so that The resistance of the loop can be controlled within tens of microohms; and the inductance of the loop is difficult to effectively reduce because of the need to provide an output detection loop. Even if it is less than 1 microhenry, it can generate hundreds of microohms of output loop inductance, resulting in The required power input apparent power is higher

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