Primary-side regulation for isolated power supplies
AssigneeTexas Instruments Incorporated
InventorsERHAN OZALEVLI, DAVID DANIELS, LUTHULI E. DAKE
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Abstract
A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.
Claims20
A DC-DC converter, comprising:
- a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter;
- a primary side diode to model effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter;
- and
- an output correction circuit to control a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.
A DC-DC converter, comprising:
- a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter;
- a current source to drive a primary side diode, wherein the primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter;
- and
- an output correction circuit to control a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.
An apparatus, comprising:
- a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter;
- a current source to drive a primary side diode, wherein the primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter;
- and
- an output correction circuit to control a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode, wherein the output correction circuit controls a voltage across the primary side diode according to a function of average load current.
Dependencies are inferred from the claim text.