Noise-shaped power converters
AssigneeTexas Instruments Incorporated
InventorsRahmi Hezar, Nikolaus Klemmer
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Abstract
Noise-shaped frequency hopping power converters are disclosed. An example noise-shaped frequency hopping power converter comprises a shaped number generator having a first output to output a noise-shaped selection signal and a power converter having a first input to receive an input voltage signal, a second input to receive a switching signal that is based on the noise-shaped selection signal, and a second output to output an output voltage signal based on the switching signal.
Claims20
An apparatus to perform power conversion, the apparatus comprising:
- a shaped number generator that generates a noise-shaped selection signal and having an output to output the noise-shaped selection signal, wherein the shaped number generator includes a pseudo-random number generator that generates a number signal, a first adder that combines the number signal with a noise signal to generate a shaped number signal, and a quantizer that quantizes the shaped number signal to generate the noise-shaped selection signal, and wherein the noise signal is generated by filtering a quantization error between the shaped number signal and the noise-shaped selection signal;
- a frequency selector having an input to receive the noise-shaped selection signal and an output to output a ramp signal that is generated based on the noise-shaped selection signal;
- and
- a switching power converter having a first input to receive an input voltage signal, a second input to receive a switching signal to control a power transistor of the switching power converter, and an output to output an output voltage signal transformed from the input voltage signal based on the switching signal controlling the power transistor;
- wherein the switching signal is based on the ramp signal, and wherein the noise-shaped selection signal generated by the shaped number generator is not dependent on the ramp signal.
A method for power conversion, the method comprising:
- generating a number signal;
- noise-shaping the number signal to generate a noise-shaped selection signal, wherein noise-shaping the number signal to generate the noise-shaped selection signal includes adding a noise signal to the number signal to generate a shaped number signal and quantizing the shaped number signal to generate the noise-shaped selection signal;
- generating a ramp signal by selecting, based on the noise-shaped selection signal, a frequency for the ramp signal, wherein the generation of the noise-shaped selection signal is not dependent on the ramp signal;
- and
- controlling a switching power converter based on the ramp signal.
A tangible non-transitory computer readable medium comprising instructions that, when executed, cause a machine to at least:
- generate a number signal;
- noise-shape the number signal to generate a noise-shaped selection signal by adding a noise signal to the number signal to generate a shaped number signal and quantizing the shaped number signal to generate the noise-shaped selection signal;
- and
- generate a ramp signal by selecting, based on the noise-shaped selection signal, a frequency for the ramp signal, wherein the generation of the noise-shaped selection signal is not dependent on the ramp signal;
- and
- control a switching power converter to selectively enable or disable a power transistor of the switching power converter based on the ramp signal.
Dependencies are inferred from the claim text.