Systems and methods for reducing standby power consumption of switch-mode power converters

A power conversion system, the system comprising:

• a first capacitor including a first capacitor terminal and a second capacitor terminal;
• a second capacitor including a third capacitor terminal and a fourth capacitor terminal;
• a plurality of diodes including a first diode, a second diode, a third diode, and a fourth diode, the first diode being coupled to the second diode at a first node, the second diode being coupled to the fourth diode at a second node, the fourth diode being coupled to the third diode at a third node, the third diode being coupled to the first diode at a fourth node;
• a fifth diode including a first anode and a first cathode, the first anode being connected to a first input terminal;
• a sixth diode including a second anode and a second cathode, the second anode being connected to a second input terminal, the first cathode and the second cathode being connected to a fifth node;
• a system controller including a first controller terminal, a second controller terminal, a third controller terminal, a fourth controller terminal, and a fifth controller terminal;
• a primary winding including a first winding terminal and a second winding terminal;
• a secondary winding coupled to the primary winding;
• an auxiliary winding coupled to the secondary winding;
• and
• a switch including a first switch terminal and a second switch terminal;
• wherein:
• the first node is connected to the first input terminal;
• the second node is connected to the first winding terminal;
• the third node is connected to the second input terminal;
• the fourth node is biased to a predetermined voltage;
• the fifth node is connected to the first controller terminal;
• the second controller terminal is connected to the second input terminal;
• the third controller terminal is biased to the predetermined voltage;
• the fourth controller terminal is connected to the third capacitor terminal;
• the fourth capacitor terminal is biased to the predetermined voltage;
• the first capacitor terminal is connected to the first input terminal;
• the second capacitor terminal is connected to the second input terminal;
• the first switch terminal is connected to the fifth controller terminal;
• and
• the second switch terminal is connected to the second winding terminal;
• wherein:
• the first input terminal and the second input terminal are configured to receive an input voltage;
• and
• the secondary winding is configured to generate an output voltage based on at least information associated with the input voltage.