Active clamping with bootstrap circuit

A power converter comprising:

• a transformer having a primary winding and a secondary winding, a first terminal of the primary winding being configured to be coupled to a DC voltage input node, the secondary winding being configured to be coupled to a load;
• a main switch coupled to a second terminal of the primary winding to control a current through the primary winding;
• and
• an active clamp circuit comprising:
• an active clamp switch having a drain node, a gate node, and a source node, the drain node being directly electrically connected to the first terminal of the primary winding;
• an active clamp capacitor having a first terminal directly electrically connected to the source node of the active clamp switch, and a second terminal directly electrically connected to the second terminal of the primary winding of the transformer;
• a gate driver circuit coupled to the gate node to control the active clamp switch, the gate driver circuit having a high-side input voltage node and a low-side input voltage node, the low-side input voltage node being directly electrically connected the first terminal of the active clamp capacitor;
• and
• a voltage regulator circuit having a voltage input node directly electrically connected to the second terminal of the active clamp capacitor, a voltage output node directly electrically connected to the high-side input voltage node of the gate driver circuit, and being configured to:
• i) receive, at the voltage input node, an input voltage from the second terminal of the active clamp capacitor, and ii) provide, from the voltage output node, a regulated voltage to the high-side input voltage node of the gate driver circuit using the input voltage, the regulated voltage being of a sufficient voltage level to control the active clamp switch.