Conversion control circuit and converter thereof

摘要

A conversion control circuit for controlling the operation of a power transistor is disclosed. The conversion control circuit includes a voltage-regulating switch and a control unit. One end of the voltage-regulating switch connects to an external voltage input terminal while another end connects to a voltage-regulating capacitor. The conversion control circuit converts an input voltage inputted from the external voltage input terminal into a power voltage. The power voltage is for supplying operating power to the conversion control circuit. The control unit receives a feedback voltage signal to generate a voltage-regulating pulse signal and a turn-on pulse signal, which are used for controlling the operations of the voltage-regulating switch and the power transistor, respectively and for defining a charging period for charging the voltage-regulating capacitor. A converter including the described conversion control circuit is also disclosed.

主权项

1. A conversion control circuit, for controlling operation of a power transistor comprising:
a voltage-regulating switch, having one end thereof connected to an external voltage input terminal and another end thereof connected to a voltage-regulating capacitor, for converting an input voltage inputted from the external voltage input terminal into a power voltage to supply operating power to the conversion control circuit; and a control unit, for generating a voltage-regulating pulse signal and a turn-on pulse signal to control the operations of the voltage-regulating switch and the power transistor, respectively, and for defining a charging period of the voltage-regulating capacitor charged through the external voltage input terminal.