Patent ID: 6169374
Filing Date: 2001-01-02
Classification: H02M,H05B,Y02B

Abstract:
A low frequency to high frequency power converter comprising: a source of low frequency line voltage, having two source connection points between which the low frequency line voltage is maintained, a DC supply circuit having at least two diodes and four terminals, two of said terminals being AC-side terminals, and two of said terminals being DC-side terminals, one of said diodes being connected between one of the AC-side terminals and one of the DC-side terminals, an input inductor connected in series between one of said source connection points and a first of said AC-side terminals, the second of said AC-side terminals being connected to the other of said source connection points, a half-bridge inverter connected to receive DC voltage from said DC-side terminals, said inverter comprising two switches connected in series and having an output node between said switches for providing a high frequency voltage, a load circuit carrying a first high frequency current and having an end connected to said output node, said load circuit comprising two connection points for a load, and a high frequency power feedback circuit, said feedback circuit including a connection to said load circuit, characterized in that said power feedback circuit is a current feedback circuit, one of said two connection points for a load is another end of said load circuit, and said connection to said load circuit is connection of said another end of the load circuit to a first node which is one of said AC-side terminals, and said converter further comprises a voltage feedback circuit including a feedback capacitor connected between the other of said two connection points for a load and a second node which is the other of said AC-side terminals.