Patent ID: 9748948
Date: 2017-08-29
CPC Classifications: H03K

Claim:
1. A power converter control circuit comprising: a bipolar junction transistor (BJT) having a base, a collector and an emitter; a metal oxide semiconductor field effect transistor (MOSFET) coupled to the emitter; a bias voltage supply coupled to the base; a buffer coupled to the base; a controller coupled to the gate of the MOSFET, the controller configured to apply a pulse width modulated (PWM) signal to control the MOSFET; and a timer element coupled between the controller and an input of the buffer, the timer element configured to, in response to receiving a control signal from the controller to turn on the MOSFET, cause the buffer to inject a current pulse to the base for a fixed period of time, the fixed period of time selected such that the current pulse will substantially saturate the BJT.