Dc power supply from a constant current source

A power supply comprising:

• an active bridge section with input terminals that receive power from a constant current source;
• a resonant section comprising a resonant inductor and a resonant capacitor, the resonant section connected to an output of the active bridge section;
• an output rectifier that receives power from the resonant section and comprising output terminals for connection to a load;
• a controller that regulates output current to the load;
• a bypass branch connected in parallel with the input terminals, wherein the bypass branch shunts current from the constant current source through the bypass branch when the bypass branch is active;
• a resonant capacitor voltage clamping circuit that clamps voltage across the resonant capacitor to a voltage less than a maximum voltage rating of the resonant capacitor during a transient condition;
• and
• a current limiting circuit connected in series between an output terminal of the output rectifier and the load, wherein the current limiting circuit increases a resistance across the current limiting circuit in response to output current to the load increasing above an output current limit.

A controller comprising:

• an output current regulation feedback loop that regulates output current of a power supply to a load, wherein the controller regulates output current to the load by controlling switching of an active bridge section of the power supply, the power supply comprising:
• a resonant section comprising a resonant inductor and a resonant capacitor, the resonant section connected to an output of the active bridge section, the active bridge section comprising input terminals that receive power from to a constant current source, wherein the active bridge section operates at a fixed switching frequency;
• and
• an output rectifier that receives power from the resonant section and comprising output terminals for connection to the load,
• wherein the fixed switching frequency of the active bridge section matches a resonant frequency of the resonant section.