Patent ID: 8044536
Filing Date: 2011-10-25
Classification: H02J,H02M

Abstract:
1. A device comprising: a battery having an output of a battery voltage; a step-up voltage converter having an input coupled to the battery voltage and configured to produce a high supply voltage at an output; a high voltage circuit coupled to the output of the step-up voltage converter; a low voltage circuit; a voltage regulator having an input coupled to the output of the step-up voltage converter, the voltage regulator having an activated state, in which a low supply voltage is produced at an output of the voltage regulator that is coupled to the low voltage circuit, and a deactivated state, in which the low supply voltage is not produced at the output of the voltage regulator; a first diode including an anode side coupled to the battery voltage and a cathode side coupled to the low voltage circuit; a bypass circuit having an input coupled to the anode side of the first diode and an output coupled to the cathode side of the first diode, wherein power is delivered to the low voltage circuit through the bypass circuit when the bypass circuit is activated and power is blocked from being delivered to the low voltage circuit through the bypass circuit when the bypass circuit is deactivated; and a controller selectively couples the low voltage circuit to one of the output from the step-up voltage converter and the battery voltage, deactivates the bypass circuit when the voltage regulator is activated and activates the bypass circuit when the voltage regulator is deactivated.