POWER SUPPLY START CIRCUIT

摘要

A start circuit (70) for starting the generation of pulse width modulated switching pulses is disclosed for use in a DC/DC switching converter power supply. The starting circuit (70) is responsive to the initiation of a DC voltage source and starts the operation of a pulse generator (60). The starting circuit (70) also includes a relaxation oscillator (71) connected to the DC voltage source for periodically generating a start pulse at a predetermined frequency. On going power is coupled to the pulse generator (60) once the generator begins operation. The relaxation oscillator (71) is selectively disabled by a disabling circuit (90, 92, 94) when the pulse generator (60) is powered by the ongoing power supplied by the power supply during normal operation. The start circuit includes means (107) for delaying the disabling of the relaxation oscillator (71) for a preselected period after shutdown of the power supply and includes a rapid start circuit (300) for reducing the time between restoration of input power and the operation of the start circuit (70).