Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2006-10-31
2006-10-31
Laxton, Gary L (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S225000, C323S282000
Reexamination Certificate
active
07129678
ABSTRACT:
A low cost, board level, inductor-based charge pump is provided to generate a sufficiently high voltage to drive a power MOSFET307having a rotor coil311attached on its source side in an automotive alternator voltage regulator. A first BJT transistor303of the charge pump receives a clock signal at its base from an application specific integrated circuit (ASIC)302. The clock signal continuously turns transistor303on and off, forcing a current to flow through an inductor301connected to a voltage supply terminal. A second BJT transistor308receives a gate control signal at its base from the ASIC302for turning the second transistor308on and off to enable the circuit. In operation when the first transistor303is turned off, a slowly decreasing current flows from the inductor301to an output node. With the base of the second transistor308low to enable the system, the second transistor308is turned off and the current flows from the output node through a capacitor309to ground. The current charges the capacitor309to a higher voltage level than the alternator system voltage Vcc. The voltage across the capacitor309is sufficiently high to drive the power MOSFET307in an automotive alternator voltage regulator.
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Fliesler & Meyer LLP
Victory Industrial Corporation
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