System and method for switch mode power supply delay...

Details System and method for switch mode power supply delay... System and method for switch mode power supply delay...

2011-04-26

2011-04-26

Vu, Bao Q (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S223000, C323S224000, C323S282000, C323S284000, C323S285000

Reexamination Certificate

active

07932703

ABSTRACT:
A delay applied to a turn-on time for a high side switch in a switch mode power converter prevents oscillation between continuous and discontinuous conduction modes under light load conditions. The delay equalizes turn-on time for a high side switch with respect to continuous and discontinuous modes, so that turn-on time is not treated differently between the different modes. The delay value can be set for be equivalent to a propagation delay through a driver for a low side switch, in addition to a turn-off time for the low side switch. The addition of the delay element tends to maintain the switch mode power converter in a discontinuous mode under light load conditions and avoids oscillation between discontinuous and continuous conduction modes.

REFERENCES:
patent: 6249156 (2001-06-01), Attwood
patent: 6958592 (2005-10-01), Chapuis
patent: 7446513 (2008-11-01), Dikken et al.
patent: 2005/0110475 (2005-05-01), Chapuis
patent: 2006/0164867 (2006-07-01), Dikken et al.

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