Electricity: power supply or regulation systems – Remote sensing
Patent
1995-09-22
1997-10-21
Wong, Peter S.
Electricity: power supply or regulation systems
Remote sensing
363 79, 363 97, 323235, H02M 3335
Patent
active
056800347
ABSTRACT:
A pulse width modulated controller controls a zero-voltage switching resonant power converter or inverter. The on time of the power switch (110) of the converter or inverter is varied by an error amplifier (280) such that the output voltage of the converter or inverter maintains proportionality to a reference voltage (290). The off time is terminated by a switch-voltage detector (320) when the voltage across the power switch (110) drops below a threshold voltage (330) due to the natural resonance of the external resonating capacitor (120) and inductors (130 and 150). In the first two embodiments of the invention, a single timing capacitor (260) is employed both for determining the on time and the off time. In two other embodiments, two timing capacitors (262 and 264) are employed for separately determining the maximum allowed off time and the variable on time. A cycle-by-cycle current limit circuit comprising a current sensor (605), a comparator (610), and an R-S latch (620) may be added to the circuits representing each of the embodiments. By incorporating a soft start subcircuit (775) and an overlap detector (710, 715, 20, 725), protection against overdissipation of the power switch caused by loss of zero-voltage switching can also be implemented. The soft start subcircuit can also be triggered by a voltage detector (740, 745), which monitors the output voltage of the power converter or some other voltage within the system, such as the peak voltage across the power switch (110), to effectively implement overvoltage protection.
REFERENCES:
patent: 4864480 (1989-09-01), Melcher
patent: 5387822 (1995-02-01), Martin-Lopez et al.
patent: 5532626 (1996-07-01), Khayat
Kwang-Hwa Liu and Fred C. Lee, "Zero-Voltage Switching Technique in DC/DC Converters," IEEE, 1986, pp. 58-70.
Richard Redl and Bela Molnar, "Class-E Resonant Regulated DC/DC Power Converters: Analysis of Operation, and Experimental Results at 1.5 MHz," IEEE PESC, 1983 Record, pp. 50-60.
N.O. Sokal and A.D. Sokal, "Class E-A New Class of High Efficiency Tuned Single-Ended Switching Power Amplifiers," IEEE Journal of Solid-State Circuits, pp. 168-176, Jun. 1975, vol. SC-10, No. 3.
Hein William E.
Riley Shawn
Toko Inc.
Wong Peter S.
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