phase shift clock for digital llc converter

Abstract

The techniques of this disclosure can digitally generate driver signals with a finer period (or frequency) resolution than can be achieved by simply counting the clock periods of the system clock. The driver signals can be configured to trigger based on a single output clock signal, which can be phase shifted relative to the main system clock. The clock phase shift circuit can increase the phase shift of the output clock signal by any fraction relative to the main system clock. Driver signals generated based on the phase-shifted output clock can achieve high resolution in frequency that is desired when controlling some pulse width modulation circuits, such as LLC converters.

Description

technical field [0001] The present disclosure relates to generating control signals for frequency modulation circuits. Background technique [0002] Some frequency modulation circuits have a steep transfer curve of output power versus input frequency. Small frequency changes in the input signal may result in large output changes, so precise control of the input signal frequency may be required. In some examples, generating the input signal by counting an entire clock cycle of the system clock may not yield a resolution fine enough to precisely control the frequency of the input signal. Some techniques for increasing resolution may also increase system power consumption or increase system complexity and cost. Contents of the invention [0003] In one example, the present disclosure relates to a system comprising: a main input clock; a clock phase shift circuit configured to: output a second clock signal, wherein the second clock signal frequency is approximately the same ...

AI Technical Summary

Problems solved by technology

Some resolution-enhancing techniques may also increase system power consumption or increase system complexity and cost

Images