Method of and apparatus for efficient high voltage generation by resonant fly back
First Claim
1. A method of low-current, high voltage generation for high-impedance application to a load with the aid of a resonant circuit, that comprises, successively switching input energy from a source into the resonant circuit during an energy input interval that is a portion of each of a plurality of power conversion cycles;
- adjusting the resonant circuit to enable resonant flyback operation, with storage inductance thereof resonating with capacitance thereof, and to permit free ringing of the circuit during another portion of each conversion cycle;
delivering energy from said circuit to a load at the voltage peak developed within the circuit;
returning to the source at the end of each conversion cycle the remainder of the energy therein after each energy delivery to the load; and
varying the energy input interval in each of the conversion cycles in response to variations in the load so that the length of the energy input intervals is directly proportional to the load.
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Accused Products
Abstract
This disclosure is concerned with adapting very high-voltage, low-current, high impedance power source circuits, such as CRT anode supplies and the like, to employ the efficiency over wide input voltage ranges and other advantages, including small size, of switching-mode operation through combining variable frequency (or period) output control circuitry with resonant high-voltage transformers, wherein the transformer resonant frequency is rendered comparable to the desired range of conversion frequencies; and in which resonant flyback circuit operation drives a voltage multiplier such as to accommodate the resonance caused by the stray capacitance shunting its storage inductance.
55 Citations
17 Claims
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1. A method of low-current, high voltage generation for high-impedance application to a load with the aid of a resonant circuit, that comprises, successively switching input energy from a source into the resonant circuit during an energy input interval that is a portion of each of a plurality of power conversion cycles;
- adjusting the resonant circuit to enable resonant flyback operation, with storage inductance thereof resonating with capacitance thereof, and to permit free ringing of the circuit during another portion of each conversion cycle;
delivering energy from said circuit to a load at the voltage peak developed within the circuit;
returning to the source at the end of each conversion cycle the remainder of the energy therein after each energy delivery to the load; and
varying the energy input interval in each of the conversion cycles in response to variations in the load so that the length of the energy input intervals is directly proportional to the load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- adjusting the resonant circuit to enable resonant flyback operation, with storage inductance thereof resonating with capacitance thereof, and to permit free ringing of the circuit during another portion of each conversion cycle;
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9. A low-current, high-voltage power supply apparatus for a high impedance load having, in combination, a resonant circuit connected with a control circuit comprising switching means for successively forcing an input voltage into the resonant circuit for a variable energy input interval that is a portion of each of a plurality of power conversion cycles;
- said resonant circuit being constructed to operate in resonance flyback at a frequency comparable to a desired power conversion frequency and to provide free-ringing of capacitance of the resonant circuit shunting storage inductance thereof during another portion of each power conversion cycle; and
feedback means for operating the control circuit to vary each energy input interval so that the length of the energy input intervals is directly proportional to the load. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- said resonant circuit being constructed to operate in resonance flyback at a frequency comparable to a desired power conversion frequency and to provide free-ringing of capacitance of the resonant circuit shunting storage inductance thereof during another portion of each power conversion cycle; and
Specification