Charge pump voltage regulator

Details Charge pump voltage regulator Charge pump voltage regulator

1986-10-28

1988-03-22

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

322 28, G05F 156

Patent

active

047331593

ABSTRACT:
A voltage regulator (11) provides a pulse width modulated voltage regulator output (40) to a drive circuit (37) to provide field coil excitation for a voltage generator (15-17) providing a charging signal for a battery (14). The voltage regulator output determines on/off states of an FET power switching device (28) coupled in series with a field coil (17) across a maximum power source voltage potential V.sub.BAT corresponding to battery voltage. The drive circuit includes a charge pump (26, 35, 36) with a low capacitance capacitor (26) coupled and decoupled across a source of voltage potential at a rate determined by a high frequency signal (41), provided by the regulator, having a frequency substantially in excess of the frequency of the voltage regulator output. The drive circuit includes a pair of switches (21, 35) which alternately couple one terminal of the capacitor to either battery voltage or ground potential in accordance with the voltage regulator output. The above configuration provides a control voltage (44) at the gate of the FET substantially in excess of battery voltage and this insures maximum field current when the FET is on. This is achieved with a minimum capacitance for the capacitor, thus reducing circuit size and cost. Battery current drain of the drive circuit is minimized by disconnecting the one terminal of the capacitor from battery voltage when the FET is off.

REFERENCES:
patent: 3343060 (1967-09-01), Ingraham
patent: 3447065 (1969-05-01), Kuhn
patent: 4210856 (1980-07-01), Taylor
patent: 4346337 (1982-08-01), Watrous
patent: 4386310 (1983-05-01), Sievers
patent: 4388586 (1983-06-01), Lamoth
patent: 4388587 (1983-06-01), Lamoth et al.
patent: 4580090 (1986-04-01), Bailey et al.
patent: 4636711 (1987-01-01), Freymuth
Motorola Data Sheets XPC1500 for the 16 Ampere Logic-to-Power Switch.
Motorola Data Sheet MPC1500, Logic-to-Power Switch Block Diagram.

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