PPROBLEM TO BE SOLVED: To provide a method and an apparatus for implementing a control circuit for reducing energy consumption by a power converter under the condition of light load or no load by using an unregulated dormant operation mode. PSOLUTION: The control circuit includes: a drive signal generator coupled to regulate a flow of energy to a power converter output in response to an energy requirement of one or more loads. An unregulated dormant mode control circuit is included and is coupled to render dormant the drive signal generator thereby ceasing the regulation of the flow of energy to the power converter output by the drive signal generator when the energy requirement of the one or more loads falls below a threshold. The drive signal generator is coupled to be unresponsive to changes in the energy requirements of the one or more loads when dormant. The unregulated dormant mode control circuit is coupled to power up the drive signal generator after a period of time has elapsed. The drive signal generator is coupled to again be responsive to changes in the energy requirement of the one or more loads after the period of time has elapsed. PCOPYRIGHT: (C)2010,JPO&INPIT
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