Zero current detection circuit for converter soft switching control
AssigneeTexas Instruments Incorporated
InventorsZhong Ye, Sanatan Rajagopalan
Life of this patent
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Abstract
A circuit includes a zero current detector (ZCD) circuit that senses an inductor current of an inductor and generates signal pulses indicating when an increasing cycle of the inductor current crosses a predetermined current value and when a decreasing cycle of the inductor current crosses the predetermined current value. A sync control provides a control signal specifying one of the signal pulses corresponding to the increasing or decreasing cycle of the inductor current. A sync selector circuit generates a sync pulse representing the signal pulse from the ZCD in response to the control signal. The sync pulse triggers a timing adjustment for a switch device.
Claims18
A circuit, comprising:
- a zero current detector (ZCD) circuit configured to sense an inductor current of an inductor and generate signal pulses indicating when an increasing cycle of the inductor current crosses a predetermined current value and when a decreasing cycle of the inductor current crosses the predetermined current value;
- a sync control configured to provide a control signal specifying one of the signal pulses corresponding to the increasing or decreasing cycle of the inductor current;
- and
- a sync selector circuit configured to generate a sync pulse representing the one of the signal pulses from the ZCD selected in response to the control signal, the sync pulse configured to trigger timing adjustment for a switch device.
A circuit, comprising:
- a zero current detection circuit configured to sense an inductor current of an inductor and generate a sync pulse indicating when a discharge cycle of the inductor current crosses a predetermined current value;
- and
- a control circuit configured to utilize the sync pulse to control timing of at least one pair of switch devices, the sync pulse configured to begin a delay period in the control circuit to increase an end portion of a discharge period of the inductor current for one of the pair of switch devices.
Dependencies are inferred from the claim text.