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AssigneeSemiconductor Componenents Industries, LLC
InventorsAjay Karthik HARI, Bryan Wayne MCCOY
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A power converter has a power transistor and inductor coupled in a conduction path with the power transistor. A switching frequency of the power transistor is reduced during a light load condition. A pulse width of a drive signal to the power transistor is controlled to select a current through the inductor and power transistor corresponding to the switching frequency to maintain a fixed output power of the power converter, and further to vary the current through the inductor and power transistor to maintain the fixed output power of the power converter over a range of switching frequencies. A first number of pulses of the drive signal to the power transistor during a first time period sets the fixed output power of the power converter. No pulses of the drive signal are provided during a second time period after the first time period.
A power converter, comprising:
A power converter, comprising a controller including an input coupled for receiving a signal representative of a current through a primary side inductor of the power converter, wherein the controller establishes a relationship of the current through the primary side inductor given a primary inductance of primary side inductor that provides fixed output power of the power converter and controls a drive signal to vary the current through the primary side inductor in accordance with the relationship to maintain the fixed output power of the power converter.
A method of using a power converter, comprising providing a controller including an input coupled for receiving a signal representative of a current through a primary side inductor of the power converter, wherein the controller establishes a relationship of the current through the primary side inductor given a primary inductance of primary side inductor that provides fixed output power of the power converter and controls a drive signal to vary the current through the primary side inductor in accordance with the relationship to maintain the fixed output power of the power converter.
Dependencies are inferred from the claim text.