Method and apparatus for controlling a resonant power module
First Claim
1. A power module of the resonant type comprising:
- a resonant power circuit for supplying current to a load;
first and second switching elements coupled to the resonant circuit for alternately supplying current to the resonant circuit;
trigger generator means coupled to the switching elements for supplying trigger signals to alternately enable the first and second switching elements; and
control means coupled to the trigger generator means for operating the power module in a first mode wherein the resonant circuit current is controlled by varying the repetition rate of the trigger signals and in a second mode wherein the trigger signal repetition rate is fixed and the resonant circuit current is controlled by varying the on/off duty cycle of the power module.
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Abstract
A method and apparatus for controlling a resonant power module comprising a resonant power circuit which is coupled to a load. First and second switching elements are coupled to the resonant circuit for alternately supplying a flow of current. Trigger generator means are provided for supplying trigger signals to alternately enable the first and second switching elements. A control means is coupled to the trigger generator for operating the power module in a first mode in which the resonant circuit current is controlled by varying the repetition rate of the trigger signals. The control means operates the power module in a second mode by maintaining the trigger signal repetition rate at a fixed limit and controlling the resonant circuit current by varying the on/off duty cycle of the power module.
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Citations
12 Claims
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1. A power module of the resonant type comprising:
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a resonant power circuit for supplying current to a load; first and second switching elements coupled to the resonant circuit for alternately supplying current to the resonant circuit; trigger generator means coupled to the switching elements for supplying trigger signals to alternately enable the first and second switching elements; and control means coupled to the trigger generator means for operating the power module in a first mode wherein the resonant circuit current is controlled by varying the repetition rate of the trigger signals and in a second mode wherein the trigger signal repetition rate is fixed and the resonant circuit current is controlled by varying the on/off duty cycle of the power module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling the current delivered to a load by a power module of the resonant type in which a pair of switching elements are alternately enabled by trigger signals to supply current to the resonant circuit comprising:
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varying the repetitive rate of the switching element trigger signals to control the current in the resonant circuit above a predetermined current level; and maintaining the switching element trigger repetition rate at the rate established by the predetermined current level and varying the on/off duty cycle of the power module to control the current in the resonant circuit at or below the predetermined current level. - View Dependent Claims (12)
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Specification