Current-mode control device and switching power supply employing

Details Current-mode control device and switching power supply employing Current-mode control device and switching power supply employing

1998-07-07

1999-05-11

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 79, 363 97, H02M3/335

Patent

active

059034475

ABSTRACT:
A current-mode control device for controlling an output voltage of a DC power supply including: a switching element for supplying an output voltage of the DC power supply through an on/off switching action; an output voltage detector circuit for detecting the output voltage of the DC power supply and outputting an output voltage based on the output voltage of the DC power supply; a current sense circuit for converting into a voltage a switching current flowing through the switching element during the switch-on period of the switching element to sense and output the resulting voltage; an integrating circuit for converting the switching current of the switching circuit that increases at a gradient of a straight line linear function with time during of the switch-on period of the switching element into a voltage that increases at a rate defined by a quadratic or higher-order curved line with time by integrating the switching current of the switching circuit at least once and for superimposing the resulting voltage on the output voltage of the current sense circuit; and a switching control circuit for controlling the on/off switching action of the switching element in response to the output voltage of the output voltage detector circuit and the output voltage of the current sense circuit on which the output voltage of the integrating circuit is superimposed such that the output voltage of the DC power supply is stabilized.

REFERENCES:
patent: 4684859 (1987-08-01), Nohmi et al.
patent: 5371667 (1994-12-01), Nakao et al.
patent: 5661394 (1997-08-01), Nakao et al.

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