초록 ▼

A unity power factor power supply includes a boost converter. The boost converter draws current in phase with the input voltage by operating as a current regulator having a current reference control signal which tracks the line voltage waveform. A sample and hold technique is utilized to accommodate

A unity power factor power supply includes a boost converter. The boost converter draws current in phase with the input voltage by operating as a current regulator having a current reference control signal which tracks the line voltage waveform. A sample and hold technique is utilized to accommodate single cycle step input compensation and to reduce harmonic distortion over a wide input frequency range.

대표청구항 ▼

[ What is claimed is:] [1.] A power factor controller for a switched power supply including a pulse width modulation control input, the switched power supply receiving input power at variable frequencies and providing output power with an optimized power factor, the power factor controller comprisin

[ What is claimed is:] [1.] A power factor controller for a switched power supply including a pulse width modulation control input, the switched power supply receiving input power at variable frequencies and providing output power with an optimized power factor, the power factor controller comprising:a sample and hold circuit coupled to the switched power supply to receive an electrical voltage parameter related to the input power and to provide an averaged sampled parameter; anda control circuit having a control output coupled to the pulse width modulation control input, the control circuit coupled to the sample and hold circuit, the control circuit generating the pulse width modulation signal in response to an integral of a factor, the factor being equal to a current parameter related to the output power plus the electrical voltage parameter multiplied by a voltage error factor related to the output power divided by a square of the averaged sampled parameter.