This thesis takes us through the process of developing a circuit for testing the safety of electronic devices, intended to perform short circuits on the primary side of electronic devices using a thyristor module. The main goal is to find the worst condition for testing the device according to the thyristor firing angle and to compare the test results at different angles.
At the beginning, we get acquainted with the basics of standardization, standards and the main institutions behind them. Furthermore, we describe some of the basic requirements of the IEC 61010-1 safety standard, and then we focus on the design of the electronic circuit of the device. In order to achieve triggering the thyristors at any firing angle with respect to the input AC voltage, the zero-cross detector is applied. It detects the transitions of the input AC voltage through zero, which sets a time reference to trigger the thyristor module after a predefined time delay. This delay is determined and measured using a microprocessor, which is programmed via an external programmer in Atmel Studio 7, while the schematics and the printed circuit board is designed in Altium Designer 2016. Finally, we test the device and determine the worst condition for testing the test sample with different triggering delays of thyristor module.
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