Autotuned resonant power source

Details Autotuned resonant power source Autotuned resonant power source

1990-03-28

1991-04-09

Stephan, Steven L.

Electric power conversion systems

Current conversion

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

363 36, 363 37, 363 79, 363 95, 323211, H02M 540

Patent

active

050069730

ABSTRACT:
A resonant, quasi-square wave, pulse width modulated (PWM) power source (33) for a connectorless power system is disclosed. The power source (33) supplies constant amplitude, fixed-frequency current to a supply loop (31) that is inductively coupled to a plurality of pickup loops (35), each of which supplies power to a remote unit, such as the seat regulator that supplies power to a group of commercial airplane seats (37). Precise, fixed-frequency control is provided by triggering a PWM with fixed-frequency sync pulses. Current control is provided by sensing the current applied to the supply loop, converting the magnitude of the sensed current to a voltage and using the voltage to control the width of the pulses produced by the PWM. The PWM pulses, in turn, control the width of the power pulses applied by the power source (33) to the supply loop (31). Stability and efficiency are improved by maintaining the output of the power source nearly resonant, i.e., maintaining the phase angle between the output voltage and current low. This is accomplished by determining the phase angle between the output voltage and current and using the result to control the magnitude of capacitance connected in series with the supply loop.

REFERENCES:
patent: 3703680 (1972-11-01), Frank et al.
patent: 4066954 (1978-01-01), Vukasovic
patent: 4234843 (1980-11-01), Gyugy et al.
patent: 4385348 (1983-05-01), Wisner
patent: 4428078 (1984-01-01), Kuo
patent: 4672300 (1987-06-01), Harper
patent: 4866592 (1989-09-01), Fujii et al.
patent: 4885675 (1989-12-01), Henze et al.
patent: 4903181 (1990-02-01), Seidel

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