Phase shift clock for digital LLC converter
AssigneeInfineon Technologies Austria AG
InventorMartin Feldtkeller
Life of this patent
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Abstract
The techniques of this disclosure may digitally generate a driver signal with a period (or frequency) at a finer resolution than can be achieved by simply counting clock cycles of a system clock. The driver signal may be configured to trigger based on single output clock signal that may be phase-shifted relative to the master system clock. A clock phase shift circuit may increment the phase shift of the output clock signal to any fraction relative to the master system clock. A driver signal generated based on the phase-shifted output clock may achieve the high resolution in frequency desirable when controlling some pulse-width modulated circuits, such as an LLC converter.
Claims19
A system comprising:
- a single, input clock, wherein the single, input clock defines a master input clock frequency;
- a clock phase shift circuit, configured to:
- output a second clock signal wherein a second clock signal frequency is approximately the same frequency as the master input clock frequency, and
- increment a phase shift of the second clock signal relative to the single, input clock, wherein the clock phase shift circuit increments the phase shift in response to a capacitor charge current amperage level;
- and
- a control unit configured to:
- receive the second clock signal,
- generate a driver signal at a predetermined frequency,
- wherein the phase shift of the second clock signal relative to the master input clock sets a fractional part of a frequency ratio between the master input clock frequency and the predetermined frequency, and
- wherein the predetermined frequency of the driver signal comprises an integer part generated by counting clock cycles and the fractional part generated by shifting the phase of the second clock signal.
Dependencies are inferred from the claim text.