Adaptive slope compensator for current mode power converters

Details Adaptive slope compensator for current mode power converters Adaptive slope compensator for current mode power converters

1997-08-11

1999-05-11

Sterrett, Jeffrey

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 363131, H02M7/5395

Patent

active

059034521

ABSTRACT:
A circuit of an adaptive slope compensator prevents instability in the current mode converter operating under a continuous mode. A timing capacitor, charged by a programmable current source, is used to generate a slope signal. The timing capacitor is discharged by a switching signal via a switching diode connection. The programmable current source is implemented by a transistor and three bias resistors. A voltage feedback signal of the converter is taken as an input to the programmable current source to control the slew rate and magnitude of the slope signal in response to the variations of the input voltage and the output power of the converter. The slope signal is added to a sensed current loop of the converter through an output diode and a resistor in series for providing necessary slope compensation.

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Keith H. Billings, "Switchmode Power Supply Handbook", McGraw-Hill Book Co., p. 3.148 -p.3.150, Dec. 1989.
Abraham I. Pressman, "Switching Power Supply Design", McGraw-Hill Book Co., pp. 105-136; pp. 143-165, Dec. 1991.
Unitrode Application Note U-97, "Modelling Analysis and Compensation of the Curent-Mode Converter", Unitrode Handbook, Dec. 1994.
Unitrode Application Note U-111, "Practical Considerations in Current Mode Power Supplies", Unitrode Handbook, Dec. 1994.

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