Synchronizable power supply controller and a system incorporatin

Details Synchronizable power supply controller and a system incorporatin Synchronizable power supply controller and a system incorporatin

1991-03-07

1992-08-25

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

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

307269, 331 55, 363 71, G05F 146

Patent

active

051422174

ABSTRACT:
A pulse width modulated power supply controller is disclosed which is capable of generating synchronization pulses in such a manner that multiple ones of such power supply controllers in a system are synchronized to the controller having the highest oscillation frequency, without requiring one of the controllers to be implemented as a master and the others implemented as slaves. The power supply controller includes two comparators which are coupled to receive the external capacitor voltage. A first comparator enables a fast charging circuit, such as a current source, for increasing the rate at which the capacitor is charged responsive to the capacitor voltage reaching a first threshold; a single-ended or differential synchronization pulse is also generated, and communicated to the first comparators of other power supply controllers in a multiple controller system. The second comparator, which includes hysteresis in its characteristic, turns off the fast charging circuit at the upper threshold and initiates the discharge of the capacitor. Control of the output and masking of the comparators of the controllers is also based on the operation of the first and second comparators.

REFERENCES:
patent: 4171517 (1979-10-01), Higa et al.
patent: 4386311 (1983-05-01), Bafaro
patent: 4532435 (1985-07-01), Wood
patent: 4694388 (1987-09-01), Losel
patent: 4825144 (1989-04-01), Alberkrack et al.
Deichmann, "External Synchronization of SGS-Thomson Switching Regulators: L296, L4960, L4962, L4964" (SGS-Thomson Microelectronics, Inc.).
Unitrode Linear Integrated Circuits Data and Application Handbook (1990), pp. 9-108, 9-109, 9-139-144.

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