Connection apparatus circuit and high voltage surge protection method thereof

摘要

A connection apparatus circuit includes an isolation transformer, an impedance matching network, a high-voltage capacitor and a first high-voltage surge protector. The isolation transformer has a first coil and a second coil, wherein the first coil has a first terminal, a second terminal and a center tap. The impedance matching network is coupled between the center tap and a relay terminal. The high-voltage capacitor is coupled between the relay terminal and a ground terminal. The first high-voltage surge protector is coupled between the relay terminal and the ground terminal. When a high-voltage surge exceeds a default value between the first terminal or the second terminal and the ground terminal, the first high-voltage surge protector is conducted to clamp current on the impedance matching network.

主权项

1. A connection apparatus circuit comprising:
an isolation transformer having a first coil and a second coil, wherein the first coil has a first terminal, a second terminal and a center tap; an impedance matching network coupled between the center tap and a relay terminal; a high-voltage capacitor coupled between the relay terminal and a ground terminal; and a first high-voltage surge protector coupled between the center tap and the relay terminal; wherein when a high-voltage surge exceeds a default value between the first terminal or the second terminal and the ground terminal, the first high-voltage surge protector is conducted to clamp current on the impedance matching network; wherein when a DC high-voltage occurs between the first terminal or the second terminal and the ground terminal, the high-voltage capacitor is an open circuit to break current path between the first terminal or the second terminal and the ground terminal.