Control circuit for detecting a reverse current in a DC-DC...

Details Control circuit for detecting a reverse current in a DC-DC... Control circuit for detecting a reverse current in a DC-DC...

2007-11-09

2010-10-26

Vu, Bao Q (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S282000, C323S284000, C323S286000

Reexamination Certificate

active

07821236

ABSTRACT:
A DC-DC converter reducing reverse current and maintaining high conversion efficiency under a light load. The DC-DC converter perform pulse width modulation (PWM) or pulse frequency modulation (PFM) and includes a drive control circuit generating a first drive signal and a second drive signal activating and inactivating a first transistor and a second transistor in a complementary manner. A reversed flow detection circuit detects current flowing to the second transistor and generates a detection signal controlling activation and inactivation of the second transistor. A detection signal invalidation circuit, coupled to the reversed flow detection circuit and the drive control circuit, receiving an operation switch signal and invalidating the detection signal in response to the operation switch signal during at least a certain period of the PWM.

REFERENCES:
patent: 6541947 (2003-04-01), Dittmer et al.
patent: 7307406 (2007-12-01), Shirai et al.
patent: 7420356 (2008-09-01), Hojo
patent: 7548050 (2009-06-01), Shirai et al.
patent: 2007/0257651 (2007-11-01), Wrathall
patent: 2009/0033299 (2009-02-01), Ishino
patent: 2009/0201000 (2009-08-01), Kojima et al.
patent: 06-303766 (1994-10-01), None
patent: 2006-305451 (2006-11-01), None

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