(12) United States Patent (io) Patent No.: US 6,768,656 B2
Figueroa (45) Date of Patent: Jul. 27,2004
DC - DC POWER CONVERTER
(54) POWER CONVERTER WITH INPUT-SIDE RESONANCE AND PULSE-POSITION DEMODULATION FEEDBACK CONTROL
(76) Inventor: Salvador Figueroa, 23905 Los Codona Ave. #101, Torrance, CA (US) 90505-5890
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 27 days.
(21) Appl. No.: 10/351,216
(22) Filed: Jan. 25, 2003
(65) Prior Publication Data
US 2003/0151929 Al Aug. 14, 2003
Related U.S. Application Data
(60) Provisional application No. 60/351,989, filed on lan. 28, 2002.
(51) Int. CI.7 H02M 3/335
(52) U.S. CI 363/21.03; 363/41
(58) Field of Search 363/41, 16, 21.02,
(56) References Cited
U.S. PATENT DOCUMENTS
A DC power converter enclosing a regulated AC power supply within the overall design topology. The power transfer function incorporates a process wherein a portion of the negative AC signal, generated across the input winding of a power transformer, is intercepted by a power switch transitional state. The volt-second product of the intercepted AC signal is reflected into the DC input line voltage as an additive element allowing a resonant inductor to absorb the sum of both components. Thus peak voltage transferred to a resonant capacitor is two times the sum of voltage absorbed by the resonant inductor as opposed to simply doubling the DC input line voltage. Voltage across the resonant capacitor remains constant for variations in DC input line voltage within the limits of the input voltage regulating band. This is due to an inverse relationship between the DC input line voltage and voltage yielded by the negative AC signal, at point of interception by the timing pulse. The two components combine in a subtractive manner to cancel out the variation in DC input line voltage and maintain a constant voltage to the input of the AC power supply loop. Input current supplied by the Input DC line also varies inversely proportional to the applied input DC voltage within the regulating band. Thus: negative resistance describing a constant-power load line is derived directly from the peak input current.
12 Claims, 6 Drawing Sheets