| 摘要 |
A flyback power converter includes a transformer having a first primary winding and a second primary winding. The first primary winding is coupled to the positive supply rail. The second primary winding is coupled to the negative supply rail. A transistor is connected in between the first primary winding and the second primary winding for switching the transformer. A control circuit is coupled to the transistor and the second primary winding to generate a switching signal for switching the transistor and regulating the output of the flyback power converter. A supplied capacitor is connected to the control circuit to supply the power to the control circuit. The second primary winding has a leakage inductor to store a stored energy when the transistor is on. A diode is coupled from the negative supply rail to the supplied capacitor. The stored energy of the leakage inductor is discharged to the supplied capacitor through the diode once the transistor is off. The split primary winding of the transformer improves the efficiency and reduces the EMI.
|
