Patent ID: 8363435

Claim:
A power system having a boot strap stimulator for startup thereof, said power system comprising: a power inductor having a power coil and an auxiliary coil; a power transistor connected to the power coil, and the power coil and power transistor are connected to a direct current power source, wherein when the power transistor switches on and off a varying magnetic flux is created in the power inductor that causes alternating current voltages to be generated in the power coil and the auxiliary coil; a transistor driver connected to and controlling the power transistor; a digital device having an output connected to the transistor driver for control thereof; a low dropout voltage regulator supplying power to the digital device; a circuit configured to provide a low current bias voltage coupled to the direct current power source, the circuit configured to provide a low current bias voltage supplying a startup voltage to the low dropout voltage regulator and the transistor driver; and a power rectifier coupled to the auxiliary coil, wherein the power rectifier supplies an operating voltage to the low dropout voltage regulator and transistor driver; wherein the output of the digital device supplies a first control signal at a constant frequency during startup of the power system and a pulse width modulated (PWM) second control signal independent from said first signal after startup, wherein the digital device determines a switching from the first control signal to the PWM second control signal.