Patent ID: 6075353
Filing Date: 2000-06-13
Classification: G05F,H02M

Abstract:
A power circuit for a solenoid comprising: a pulse width modulation controller having a feedback input, a current sensing input, and an output signal; a field effect transistor having a gate, a drain, and a source; feedback circuit means; current signal circuit means for providing a signal to said current sensing input of said pulse width modulation controller; said output signal of said pulse width modulation controller being in electrical communication with said gate of said field effect transistor; a first inductor; a coupling capacitor; a second inductor; said first inductor providing power to said circuit means for providing said current signal when said gate of said field effect transistor is energized by said output of said pulse width modulation controller; said coupling capacitor coupling said first inductor and said second inductor and permitting flow of current therebetween and to said feedback circuit means; said feedback circuit means further comprising timing means for regulating said feedback circuit so as to allow high power energization of a solenoid coil for a period of time followed by low power energization of said solenoid coil thereafter.