Driving and clamping power regulation technique for continuous, in-phase, full-duration, switch-mode resonant converter power supply
First Claim
1. A resonant power supply comprising:
- a transformer having a primary winding and a secondary winding;
a resonant primary circuit including the primary winding in which a natural resonant current oscillates at a natural frequency in alternate positive and negative half cycles; and
switch means connected to the resonant primary circuit, the switch means driving current pulses to the resonant primary circuit in phase with and substantially only during the full duration of the positive and negative half cycles, the switch means further clamping to allow the natural resonant current to decay in magnitude substantially only during the full duration of the positive and negative half cycles, the switch means selectively alternatively driving or clamping commencing and ending substantially at each zero magnitude of the natural resonant current.
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Accused Products
Abstract
A converter power supply uses a resonant primary circuit connected to a transformer and switches driving current pulses to the resonant primary circuit in phase with and substantially over the duration of the positive and negative half cycles during drive conditions, and clamps to allow the natural resonant current to decay in magnitude substantially over the duration of the positive and negative half cycles during clamping conditions. The decisions to drive or to clamp are made on half-cycle of the naturally resonating current. An algorithmic relationship creates the maximum alternation of drive and clamp conditions to achieve the desired level of power regulation. A configuration of current switches drives the primary winding and charges a resonator capacitor during one half cycle of the resonant current, and during the other half cycle the capacitor is discharged to drive in the other direction. The power supply is particularly useful for energizing an x-ray tube.
88 Citations
69 Claims
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1. A resonant power supply comprising:
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a transformer having a primary winding and a secondary winding; a resonant primary circuit including the primary winding in which a natural resonant current oscillates at a natural frequency in alternate positive and negative half cycles; and switch means connected to the resonant primary circuit, the switch means driving current pulses to the resonant primary circuit in phase with and substantially only during the full duration of the positive and negative half cycles, the switch means further clamping to allow the natural resonant current to decay in magnitude substantially only during the full duration of the positive and negative half cycles, the switch means selectively alternatively driving or clamping commencing and ending substantially at each zero magnitude of the natural resonant current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method of supplying power using a transformer having a primary winding and a secondary winding, comprising:
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connecting the primary winding in a resonant primary circuit; oscillating a natural resonant current at a natural frequency in alternating positive and negative half cycles in the resonant primary circuit; driving current pulses to the resonant primary circuit in phase with and substantially only during the full duration of selected positive and negative half cycles to increase the magnitude of the resonant current; clamping the natural resonant current substantially only during the full duration of selected positive and negative half cycles to allow the resonant current decay in magnitude; selecting one of the driving or clamping steps with each half cycle of resonant current to control the magnitude of the resonant current in the primary winding; commencing and ending the selected one of the driving step or clamping step substantially at each zero magnitude of the natural resonant current; and deriving the power supplied from the secondary winding. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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44. A method of supplying power as defined in claim further comprising:
obtaining the average value from a predetermined number of previous consecutively occurring half cycles.
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49. A method of supplying power as defined in claim further comprising:
creating each predetermined pattern to achieve a maximum degree of alternation of the drive and clamp signals.
Specification