FLYBACK QUICK START DRIVING CIRCUIT AND DRIVING METHOD

摘要

The present disclosure discloses a flyback quick start driving circuit, comprising: a voltage input unit, a transformer including a primary winding, a secondary winding, and an auxiliary winding, a driving unit for controlling the primary winding of the transformer, a voltage pull-up unit, and a feedback control unit. The voltage pull-up unit performs a charging process according to the direct-current from the voltage input unit, so as to enable the output voltage rise up to a starting voltage which is input the driving unit. The driving unit output a control signal to drive the primary winding. Thus, a voltage is created across the auxiliary winding. The feedback control unit gets the voltage of the auxiliary winding, and determines whether to stop the charging of the voltage pull-up unit or not according to the voltage of the auxiliary winding. The circuit can be started quickly and have lower loss of the power.

主权项

1. A flyback quick start driving circuit, comprising:
a voltage input unit, for providing a direct-current voltage; a transformer, including a primary winding and a secondary winding which are coupled on the different sides of the transformer, and an auxiliary winding coupled with the primary winding on the same side of the transformer, wherein the first end of the primary winding is electrically connected with the voltage input unit to receive the direct-current voltage; a voltage pull-up unit, with the input thereof being electrically connected with the voltage input unit to receive the direct-current voltage which is used to perform the charging process, so as to enable the output voltage rise up to a starting voltage; a driving unit, with the power port thereof being electrically connected with the voltage pull-up unit to receive the output voltage and the output thereof being electrically connected with the second end of the primary winding of the transformer, wherein, when the voltage on the power port rises up to the starting voltage, the unit starts and drives the primary winding of the transformer; a feedback control unit, wherein the input thereof is electrically connected with the auxiliary winding of the transformer to get the voltage of the auxiliary winding, and the output thereof is electrically connected to the control end of the voltage pull-up unit to output a control signal according to the voltage of the auxiliary winding, so as to control the voltage pull-up unit to charge or not; and, when the voltage pull-up unit doesn't charge, the feedback control unit also feed the voltage of the auxiliary winding to the driving unit to make it keep working.