CAPACITIVELY COUPLED POWER SUPPLY
First Claim
1. A power supply, comprising:
- a supply inductor coupled to a first capacitor to form a first resonant circuit for generating a resonant waveform in a resonant operation, during a first portion of an operation cycle of said power supply;
a charge storage element for developing an output voltage to energize a load;
a rectifier coupled to said charge storage element and to said first resonant circuit and responsive to said resonant waveform for producing a first change of state in said rectifier, in accordance with said resonant waveform, at an end time of said operation cycle first portion, that causes said output voltage to be coupled back to said first resonant circuit and to interrupt said resonant operation;
a first sensor for sensing when said first change of state in said rectifier occurs;
a source of a supply current coupled to said rectifier and rectified in said rectifier to produce a rectified current that is coupled to said charge storage element to replenish a charge therein, during a second portion of said operation cycle; and
a switching transistor responsive to an output signal of said first sensor for coupling said supply current to said rectifier, after said first change of state in said rectifier occurs, and for decoupling said supply current from said rectifier, prior to an occurrence of said first change of state in said rectifier.
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Accused Products
Abstract
A power supply includes a supply inductor and a first capacitor coupled to form a resonant circuit to generate a resonant waveform in a resonant operation, during a first portion of an operation cycle of the power supply. A charge storage element develops an output voltage to energize a load. A rectifier is coupled to the charge storage element and to the resonant circuit and is responsive to the resonant waveform for applying the output voltage back to the resonant circuit to interrupt the resonant operation, at an end time of the operation cycle first portion, when the resonant waveform produces a first change of state in the rectifier. A first sensor senses when the first change of state in the rectifier occurs. A source of a supply current is coupled to the rectifier and rectified in the rectifier to produce a rectified current that is coupled to the charge storage element to replenish a charge therein, during a second portion of the operation cycle. A switching transistor is responsive to an output signal of the first sensor for enabling the supply current to be coupled to the rectifier, during the operation cycle second portion, and for disabling the supply current from being coupled to the rectifier, during the operation cycle first portion.
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Citations
11 Claims
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1. A power supply, comprising:
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a supply inductor coupled to a first capacitor to form a first resonant circuit for generating a resonant waveform in a resonant operation, during a first portion of an operation cycle of said power supply;
a charge storage element for developing an output voltage to energize a load;
a rectifier coupled to said charge storage element and to said first resonant circuit and responsive to said resonant waveform for producing a first change of state in said rectifier, in accordance with said resonant waveform, at an end time of said operation cycle first portion, that causes said output voltage to be coupled back to said first resonant circuit and to interrupt said resonant operation;
a first sensor for sensing when said first change of state in said rectifier occurs;
a source of a supply current coupled to said rectifier and rectified in said rectifier to produce a rectified current that is coupled to said charge storage element to replenish a charge therein, during a second portion of said operation cycle; and
a switching transistor responsive to an output signal of said first sensor for coupling said supply current to said rectifier, after said first change of state in said rectifier occurs, and for decoupling said supply current from said rectifier, prior to an occurrence of said first change of state in said rectifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification