Power source circuit

Details Power source circuit Power source circuit

2005-03-22

2005-03-22

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S282000, C323S224000

Reexamination Certificate

active

06870354

ABSTRACT:
A power source circuit includes a CMOS inversion circuit including a P-channel transistor and an N-channel transistor connected in series between a power source voltage and a reference potential, the transistors being alternately turned “on” or “off” by a PWM signal input to a gate of each transistor with an “on” period of the transistors being controlled, and being capable of outputting a D.C. voltage to a load via a stabilized capacitance. The circuit also includes a detection circuit outputting a detection signal showing a state where an intermediate node potential at a connection point of the P-channel transistor and the N-channel transistor surpasses the reference potential after undershooting to a level lower than the reference potential when the N-channel transistor is turned “on” during the “off” period of the P-channel transistor. An error amplifier is provided that obtains an error signal by comparing an output from the CMOS inversion circuit with a predetermined reference voltage value. A PWM circuit and output driver are provided that produce a PWM signal of which a pulse width is controlled by the error signal, supplying the PWM signal to each gate of the CMOS inversion circuit, controlling the PWM signal supplied to the gate of the N-channel transistor among PWM signals supplied to the CMOS inversion circuit by the detection signal from the detection circuit, and turning “off” an “on” state of the N-channel transistor.

REFERENCES:
patent: 6366070 (2002-04-01), Cooke et al.
patent: 2000-092824 (2000-03-01), None
patent: 2001-037213 (2001-02-01), None

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