Navitas Semiconductor Limited

Milind Gupta

Jun Li

Chih-Hsien Hsieh

A power factor correction circuit for a boost converter comprises a voltage converting means and a voltage-to-time converting means. The voltage converting means converts a supply voltage based on a time period of a turn-on duration Tand a turn-off duration Tof the boost converter into an output voltage. The voltage-to-time converting means generates the turn-on duration Tbased on the output voltage from the voltage converting means. The power factor correction circuit adjusts the turn-on duration Tsubstantially in accordance with the following relationship: The first parameter includes at least one first process-dependent parameter and the second parameter includes at least one second process-dependent parameter. The first process-dependent parameter and the second process-dependent parameter are same electrical characteristic associated with different circuit components in the power factor correction circuit.

Power factor correction circuit for a boost converter

Aspects of this disclosure relate to a discrete time analog multiplier and a discrete time analog divider. The multiplier and divider circuits are mainly using linear components such as capacitors, current sources, comparators and transconductance amplifiers, etc. The dynamic range is only limited by the available range of supply to the circuit rather than dependent on the transistor's linearity. Such limitation could be overcome by proper scaling or autoscaling of the signals. Hence, the limited dynamic range can be easily improved. With the help of using basic electronic components and operating in the analog domain, the conversion from analog to digital and/or digital to analog is not required.

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Irvine, CA, United States of America

Milind Gupta