Patent ID: 9515576
Filing Date: 2016-12-06
CPC Classification: H02H,H02M

Claim Text:
1. A bridge circuit, comprising: an input power unit comprising a first electrode and a second electrode; a converter unit being coupled to said input power unit; a first capacitor comprising a first terminal and a second terminal, said first terminal of said first capacitor being coupled to said converter unit, said second terminal of said first capacitor being coupled to said second electrode; a second capacitor comprising a first terminal and a second terminal, said first terminal of said second capacitor being coupled to said first terminal of said first capacitor, wherein the capacitance of said first capacitor is larger than the capacitance of said second capacitor, said second capacitor being a high-frequency capacitor; a detection unit being coupled to said second terminal of said second capacitor, said detection unit comprises a first diode, an opto-coupler, a resistor and an operation voltage source; and a bridge inverter unit comprising a plurality of switches and being coupled to said converter unit, said first capacitor, said second capacitor, said detection unit and said second electrode; wherein said detection unit issues a short-circuit signal to a control unit when said detection unit detects a current variation on said second capacitor; wherein said second capacitor and said first diode of said detection unit are electrically connected in series, said first diode is electrically connected in parallel with said opto-coupler of said detection unit, and said resistor is coupled to said opto-coupler and said operation voltage source.