Transformer tester based on programmable constant current source

Abstract

The invention relates to a transformer tester based on a programmable constant current source. A transformer loading clamp comprises a strip-shaped conductive plate serially connected in a load circuit; and two ends of the strip-shaped conductive plate are electrical connection ends, and the middle part is a transformer loading section coated with an insulated layer. The programmable AC constant current source comprises a constant current source circuit module and a current feedback circuit module, wherein the constant current source circuit module completes AC-DC-AC conversion, through carrying out pulse width control on a DC-AC full-bridge inverter circuit, high-voltage small current is acquired, the high-voltage small current outputted by the constant current source circuit module is subjected to voltage reduction and current boosting via a current boosting transformer to be supplied to a load circuit; the duty cycle D of a pulse width modulation driving signal outputted by a single chip microcomputer control unit to the DC-AC full-bridge inverter circuit is controlled to be 20% to 80%; and the current feedback circuit module is used for detecting the magnitude of the current of the load circuit. The transformer tester based on the programmable constant current source has the advantages of fast response speed, high precision and high detection efficiency.

Description

technical field [0001] The invention relates to electrical testing equipment, specifically a transformer testing machine for testing intelligent circuit breakers and the like. Background technique [0002] In the production process of intelligent circuit breakers in low-voltage electrical appliances, it is necessary to pass a constant power frequency alternating current (50Hz in China) to test the transformers used in them. Due to the large protection current range of intelligent circuit breakers and many models , so the test current range required for transformer testing is wide, from a few amperes to thousands of amperes [0003] The existing transformer testing machine has problems such as unreasonable structural design, low detection current accuracy, slow current adjustment speed, and low detection efficiency. Contents of the invention [0004] Purpose of the invention: In order to overcome the defects in the prior art, the invention provides a transformer testing ma...

AI Technical Summary

Problems solved by technology

[0003] The existing transformer testing machine has unreasonable structural design, low detection current accuracy, slow current adjustment speed and low detection efficiency.

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