Precharge circuit for DC/DC boost converter startup

Details Precharge circuit for DC/DC boost converter startup Precharge circuit for DC/DC boost converter startup

2007-10-02

2007-10-02

Assouad, Patrick (Department: 2809)

Electricity: power supply or regulation systems

Output level responsive

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

C365S203000, C323S314000, C323S222000

Reexamination Certificate

active

11053318

ABSTRACT:
An integrated circuit including a precharge circuit for a DC/DC boost converter which includes a reference current circuit with a MOSFET transistor (MP4) that has a gate connected with the gate of the DC/DC boost converter's power MOSFET transistor (MP5) to form a current mirror. The precharge circuit works to approach the output voltage to the supply voltage prior to the converter startup. An included regulation circuit adjusts the gate potential at the power MOSFET transistor (MP5) and at the MOSFET transistor (MP4) in the reference circuit in response to a reduction of the drain-source voltage of the power MOSFET transistor (MP5) due to precharging load capacitance, in a sense to keep the precharge current through the power MOSFET transistor (MP5) constant.

REFERENCES:
patent: 4408136 (1983-10-01), Kirsch
patent: 5745423 (1998-04-01), Tai
patent: 5998977 (1999-12-01), Hsu et al.
patent: 196 12 269 (1997-08-01), None
patent: 697 07 463 (2001-10-01), None
patent: 1 041 480 (2000-10-01), None

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