| 主权项 |
1. A primary side regulated isolation voltage converter, comprising:
a storage element having a primary winding, a secondary winding and a tertiary winding, wherein the tertiary winding is configured to induct an output voltage signal of the isolation voltage converter to generate a voltage feedback signal; a controllable switch, coupled to the primary winding, wherein an input voltage signal is converted to the output voltage signal by switching the controllable switch on and off; a control module, configured to determine whether the isolation voltage converter is in a light load state, and further configured to receive the voltage feedback signal and to provide a first control signal based on the voltage feedback signal, wherein the first control signal is active when the voltage feedback signal is smaller than a voltage reference signal; a ripple control circuit, configured to sense ripples of the output voltage signal to generate a ripple signal when the isolation voltage converter is in the light load state, and further configured to compare the ripple signal with a ripple threshold to generate a second control signal, wherein when the ripple signal is larger than the ripple threshold, the second control signal is active; and a logic circuit, configured to receive the first control signal and the second control signal, and further configured to conduct a logic operation of the first control signal and the second control signal to generate a third control signal, wherein the third control signal is configured to turn the controllable switch on when either the first control signal or the second control signal is active. |
