PWM switching regulator with current and voltage feedback

Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device

Reexamination Certificate

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C323S285000, C323S288000

Reexamination Certificate

active

06922040

ABSTRACT:
In a switching power source apparatus which outputs a DC output voltage converted from a DC power source voltage, the DC output, voltage is compared with a reference voltage to generate a feedback signal which decreases as the DC output voltage increases. A current detecting signal which decreases as the output current increase is also generated. The smaller of the feedback signal and the current detecting signal, as a comparison signal, is compared with a triangular signal in a PWM comparator to produce a PWM signal. A semiconductor switch is on-off controlled by the PWM signal. Therefore, the apparatus can perform a constant voltage control with a current limit function.

REFERENCES:
patent: 6194875 (2001-02-01), Takimoto et al.
patent: 6724174 (2004-04-01), Esteves et al.
patent: 6828766 (2004-12-01), Corva et al.
patent: 7-55055 (1995-06-01), None

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