POWER CONVERTER AND METHOD OF ENTERING SKIP AT A FIXED OUTPUT POWER IN A LIGHT LOAD CONDITION INDEPENDENT OF MAGNETIZING INDUCTANCE
First Claim
1. A method of maintaining a fixed output power during a light load condition in a power converter, comprising:
- providing a power device;
reducing a switching frequency of the power device during the light load condition; and
controlling a pulse width of a drive signal to the power device to vary a current through the power device to maintain the fixed output power of the power converter over a range of switching frequencies.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A method of maintaining a fixed output power during a light load condition in a power converter, comprising:
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providing a power device; reducing a switching frequency of the power device during the light load condition; and controlling a pulse width of a drive signal to the power device to vary a current through the power device to maintain the fixed output power of the power converter over a range of switching frequencies. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of maintaining a fixed output power during a light load condition in a power converter, comprising:
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providing a semiconductor device; reducing a switching frequency of the semiconductor device during the light load condition; and controlling a pulse width of a drive signal to the semiconductor device to select a current through the semiconductor device corresponding to the switching frequency to maintain the fixed output power of the power converter. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A power converter having a fixed output power during a light load condition, comprising:
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a semiconductor device; means for reducing a switching frequency of the semiconductor device during the light load condition; and means for controlling a pulse width of a drive signal to the semiconductor device to select a current through the semiconductor device corresponding to the switching frequency to maintain the fixed output power of the power converter. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification