Resonant converter control based on zero current detection

A method of operating a resonant circuit, comprising:

• providing one or more gate signals to cause a power switch to become selectively conductive;
• and
• with a power switch driver, causing the power switch to become nonconductive in response to a switch signal indicating that a value of a current flowing through the power switch has transitioned across a threshold value, wherein the power switch comprises:
• a first switch having a first gate, a first drain, and a first source;
• and
• a second switch having a second gate, a second drain, and a second source,
• wherein the first and second gates are electrically connected,
• wherein the first and second drains are electrically connected, and
• wherein the first switch conducts more current than the second switch, and the second switch is configured to generate the switch signal.

A resonant circuit, comprising:

• a power switch comprising:
• first and second terminals, and
• first and second parallel current paths, each of the first and second current paths terminating at each of the first and second terminals, wherein the first and second current paths are configured to be selectively conductive according to a gate signal, wherein the second current path is configured to generate a switch signal indicative of a value of a current flowing therethrough, and wherein the first current path substantially does not generate the switch signal;
• and
• a power switch driver, configured to generate the gate signal in response to one or more control signals, wherein the power switch driver is configured to cause the power switch to become nonconductive in response to the switch signal indicating that the value of the current flowing through the power switch is greater than a threshold value.

A method of operating a resonant circuit, comprising:

• providing a gate signal to cause a power switch to become conductive according to the gate signal, wherein the power switch comprises first and second terminals, and wherein the power switch comprises first and second parallel current paths, each of the first and second current paths terminating at each of the first and second terminals;
• with the second current path of the power switch, generating a switch signal indicative of a value of a current flowing therethrough, and wherein the first current path substantially does not generate the switch signal;
• with a power switch driver, generating the gate signal in response to one or more control signals;
• and
• with the power switch driver, causing cause the power switch to become nonconductive in response to the switch signal indicating that the value of the current flowing through the power switch is greater than a threshold value.