Patent ID: 7898227
Filing Date: 2011-03-01
Classification: H02M

Abstract:
1. A non-synchronous boost converter comprising: an input voltage terminal; an output voltage terminal providing an output voltage; an inductor connected between the input voltage terminal and a switched node; a diode connected between the switched node and the output voltage terminal; a capacitor connected to the output voltage terminal; a power switch connected to the switched node, for being switched to generate an output current flowing through the inductor and the diode to charge the capacitor to generate the output voltage; a load disconnecting transistor connected between the diode and the output voltage terminal, for disconnecting the output voltage terminal from the input voltage terminal when the non-synchronous boost converter is shutdown, wherein the load disconnecting transistor is a low-voltage device; and a clamping circuit connected to the load disconnecting transistor, for clamping the voltage between the gate and the source of the load disconnecting transistor under a threshold value.