Capacitively coupled power supply system

摘要

A power supply system (200) is provided which comprises a first input (206), an output (218), a DC-DC converter (204), a rectifying circuit (212) and a voltage limiter (214). An AC voltage is received by the first input. Power is supplied to a load (216) via the output. The DC-DC converter comprises a second input (203) which is capacitively coupled to the first input, and the DC-DC converter provides power to the output. The rectifying circuit is capacitively coupled to the first input and is arranged between the first input and the output. The rectifying circuit provides a rectified output voltage to the output. The voltage limiter is coupled to the output and limits the rectified voltage to a predefined voltage.

主权项

1. A power supply system (200, 300, 400, 600, 700, 812, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700) comprising:
a first input (206) for receiving an AC voltage, an output (218) for supplying power to a load (216, RL), a DC-DC converter (204, 404) comprising a second input (203) being capacitively coupled to the first input (206), and being arranged for supplying power to the output (218), a rectifying circuit (212, D1) being capacitively coupled to the first input (206) and being arranged between the first input (206) and the output (218) for supplying a rectified output voltage to the output (218), and a voltage limiter (214, Dzener2, D3a) being coupled to the output (218) for limiting the rectified output voltage to a predefined voltage.