Isolation of secondary transformer winding current during auxiliary power supply generation
First Claim
1. A method comprising:
- transferring energy, in accordance with a control signal provided from a controller, from a primary winding of a transformer of a switching power converter to a secondary-winding and to an auxiliary-winding for an auxiliary power supply during mutually exclusive first and second periods of time by at least controlling a value of a reflected voltage of the auxiliary-winding of the transformer to be lower than a reflected voltage of the secondary-winding of the transformer during transfer of energy to the auxiliary-winding during the first period of time and controlling an impedance of the auxiliary power supply to transfer energy to the secondary-winding without transferring energy to the auxiliary power supply during the second period of time, wherein the auxiliary power supply having the auxiliary-winding provides auxiliary power to the controller that provides the control signal to control the transferring of energy from the primary-winding, and the secondary-winding delivers energy for a load, other than the controller, of the switching power converter.
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Accused Products
Abstract
An electronic system and method include a controller to actively control power transfer from a primary winding of a switching power converter to an auxiliary-winding of an auxiliary power supply. The switching power converter is controlled and configured such that during transfer of power to the auxiliary-winding, the switching power converter does not transfer charge to one or more secondary-windings of the switching power converter. Thus, the switching power converter isolates one or more secondary transformer winding currents from an auxiliary-winding current. By isolating the charge delivered to the one or more secondary-windings from charge delivered to the auxiliary-winding, the controller can accurately determine an amount of charge delivered to the secondary-windings and, thus, to a load.
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Citations
20 Claims
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1. A method comprising:
transferring energy, in accordance with a control signal provided from a controller, from a primary winding of a transformer of a switching power converter to a secondary-winding and to an auxiliary-winding for an auxiliary power supply during mutually exclusive first and second periods of time by at least controlling a value of a reflected voltage of the auxiliary-winding of the transformer to be lower than a reflected voltage of the secondary-winding of the transformer during transfer of energy to the auxiliary-winding during the first period of time and controlling an impedance of the auxiliary power supply to transfer energy to the secondary-winding without transferring energy to the auxiliary power supply during the second period of time, wherein the auxiliary power supply having the auxiliary-winding provides auxiliary power to the controller that provides the control signal to control the transferring of energy from the primary-winding, and the secondary-winding delivers energy for a load, other than the controller, of the switching power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
a controller to at least control a transfer of energy, in accordance with a control signal provided from a controller, from a primary winding of a transformer of a switching power converter to a secondary-winding and to an auxiliary-winding for an auxiliary power supply during mutually exclusive first and second periods of time by at least controlling a value of a reflected voltage of the auxiliary-winding of the transformer to be lower than a reflected voltage of the secondary-winding of the transformer during transfer of energy to the auxiliary-winding during the first period of time and controlling an impedance of the auxiliary power supply to transfer energy to the secondary-winding without transferring energy to the auxiliary power supply during the second period of time, wherein the auxiliary power supply having the auxiliary-winding provides auxiliary power to the controller that provides the control signal to control the transfer of energy from the primary-winding, and the secondary-winding delivers energy for a load, other than the controller, of the switching power converter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification