Voltage balancing in half-bridge voltage converter
AssigneeTexas Instruments Incorporated
InventorIsaac Cohen
Life of this patent
Estimating the term…
Abstract
A controller for a voltage converter includes a current mode control circuit having an input. The controller includes a voltage imbalance correction circuit, which includes a subtractor configured to subtract a first voltage from a second voltage to produce a third voltage. The controller also includes a transconductance circuit coupled to the subtractor. The transconductance circuit has a current output and is configured to produce a current on the current output that is proportional to the third voltage. A capacitor is coupled to the current output and configured. The capacitor is configured to be charged by the current from the current output to produce a ramp voltage. The ramp voltage is configured to control, at least in part, the current mode control circuit.
Claims20
A circuit comprising:
- an amplifier having a first input, a second input, and an output, the first input of the amplifier coupled to an inductor terminal;
- a ramp generator having an output and a ramp slope control input, the ramp slope control input coupled to the output of the amplifier;
- and
- a summer having a first input, a second input, and an output, the first input of the summer coupled to the output of the ramp generator, and the second input of the summer coupled to a current sense input, the summer configurable to generate a first signal at the output based on adding a second signal at the first input and a third signal at the second input.
A circuit comprising:
- p1 an amplifier having a first input, a second input, and an output, the first input of the amplifier coupled to a capacitor terminal:
- a ramp generator having an output and a ramp slope control input, the ramp slope control input coupled to the output of the amplifier;
- and
- a summer having a first input, a second input, and an output, the first input of the summer coupled to the output of the ramp generator, and the second input of the summer coupled to a current sense input, the summer configurable to generate a first signal at the output based on adding a second signal at the first input and a third signal at the second input.
A voltage converter, comprising:
- a power stage having a control input and an output;
- a transformer, the transformer including a primary side winding and a secondary side winding, the primary side winding coupled to the output of the power stage;
- an amplifier having a first input, a second input, and an output, the first input of the amplifier coupled to one of the primary side winding or the secondary side winding;
- a ramp generator having an output and a ramp slope control input, the ramp slope control input coupled to the output of the amplifier;
- and
- a summer having a first input, a second input, and an output, the first input of the summer coupled to the output of the ramp generator, and the second input of the summer coupled to a current sense input, the summer configurable to generate a first signal at the output based on adding a second signal at the first input and a third signal at the second input.
Dependencies are inferred from the claim text.