Patent ID: 8830700

Claim:
A DC-DC converter, comprising: a transformer; a voltage-source power converter that is provided at a primary side of the transformer; a first voltage detection circuit that detects a first voltage between first input and output terminals of the voltage-source power converter; a current-source power converter that is provided at a secondary side of the transformer; a second voltage detection circuit that detects a second voltage between second input and output terminals of the current-source power converter; a current detection circuit that detects an input-output current between the second input and output terminals of the current-source power converter; and a controller that controls the voltage-source power converter and the current-source power converter to transfer power between the primary side and the secondary side of the transformer, wherein the controller includes a first control unit that generates a first control input for the input-output current based on the first voltage, the first control unit has a first limiter having a first range and a first limit value, the first control unit outputs the first control input when the first control input is within the first range, and the first control unit outputs the first limit value when the first control input is outside the first range, the controller includes a second control unit that generates a second control input for the input-output current based on the second voltage, the second control unit has a second limiter having a second range and a second limit value, the second control unit outputs the second control input when the second control input is within the second range, and the second control unit outputs the second limit value when the second control input is outside the second range, the controller includes a third control unit that generates a command value based on the first and second control inputs, the first and second limit values, and the input-output current, and the voltage-source power converter and the current-source power converter are controlled based on the command value.