Valley to valley switching in quasi-resonant mode for driver
AssigneeInfineon Technologies Austria AG
InventorsMarcus Schaemann, Josef Neulinger, Martin Krueger, Torsten Hinz
Life of this patent
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Abstract
Techniques are described to adjust the time when a switch is turned on from the time of one voltage valley to the time of another voltage valley for controlling an average load current or average load voltage. In some examples, the adjustment is instantaneous, and in some examples, the adjustment is gradual. Both of these example techniques provide for high switching efficiency of the switch.
Claims18
A method for controlling power delivered to a load, the method comprising:
- determining whether or not to adjust a turn-on time of a switch from a first time associated with a first voltage valley in an oscillating voltage at a node of the switch to a second time associated with a second voltage valley in the oscillating voltage at the node of the switch;
- determining one or more switch operational parameters for the switch such that if the turn-on time is adjusted from the first time to the second time an amount of power delivered to the load is substantially the same immediately before the adjustment and immediately after the adjustment;
- adjusting the turn-on time of the switch to the second time based on the determination to adjust the turn-on time;
- and
- setting the one or more switch operational parameters for the switch based on the determined one or more switch operational parameters.
A driver system for controlling power delivered to a load, the driver system comprising:
- a transformer comprising a primary side that includes a first coil and a secondary side that includes a second coil, wherein the load is connected to the second coil;
- a switch coupled to the first coil;
- and
- a driver coupled to the switch and configured to:
- determine whether or not to adjust a turn-on time of the switch from a first time associated with a first voltage valley in an oscillating voltage at a node of the switch to a second time associated with a second voltage valley in the oscillating voltage at the node of the switch;
- determine one or more switch operational parameters for the switch such that if the turn-on time is adjusted from the first time to the second time an amount of power delivered to the load is substantially the same immediately before the adjustment and immediately after the adjustment;
- adjust the turn-on time of the switch to the second time based on the determination to adjust the turn-on time;
- and
- set the one or more switch operational parameters for the switch based on the determined one or more switch operational parameters.
A driver for controlling power delivered to a load, the driver comprising:
- a controller configured to:
- determine whether or not to adjust a turn-on time of a switch from a first time associated with a first voltage valley in an oscillating voltage at a node of the switch to a second time associated with a second voltage valley in the oscillating voltage at the node of the switch;
- and
- determine one or more switch operational parameters for the switch such that if the turn-on time is adjusted from the first time to the second time an amount of power delivered to the load is substantially the same immediately before the adjustment and immediately after the adjustment;
- and
- a pulse width modulation (PWM) unit configured to:
- adjust the turn-on time of the switch to the second time based on the determination to adjust the turn-on time;
- and
- set the one or more switch operational parameters for the switch based on the determined one or more switch operational parameters.
Dependencies are inferred from the claim text.