Voltage converters and voltage generating methods for generating output voltage signals according to a pulse width modulation signal
AssigneeMediatek Inc.
InventorChien Wei Kuan
Life of this patent
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Abstract
A voltage converter is provided. The voltage converter generates an output voltage signal and comprises a controller, a wave generator, a comparator, and a voltage converting unit. The controller generates a control voltage signal according to the output voltage signal and a first reference voltage. The wave generator generates a saw-wave signal and modifies at least one of an upper limit and a lower limit of a waveform of the saw-wave signal according to the output voltage signal. The comparator generates a pulse width modulation (PWM) signal according to the control voltage signal and the saw-wave signal. The voltage converting unit generates the output voltage signal according to the PWM signal.
Claims14
A voltage converter for generating an output voltage signal, comprising:
- a controller for generating a control voltage signal according to the output voltage signal and a first reference voltage;
- a wave generator for generating a saw-wave signal and modifying at least one of an upper limit and a lower limit of a waveform of the saw-wave signal according to the output voltage signal;
- a first comparator for generating a pulse width modulation (PWM) signal according to the control voltage signal and the saw-wave signal;
- and
- a voltage converting unit for generating the output voltage signal according to the PWM signal;
- wherein the wave generator comprises:
- a second comparator for comparing the output voltage signal with a second reference voltage;
- and
- an oscillator for generating the saw-wave signal and changing the least one of the upper limit and the lower limit of the waveform of the saw-wave signal according to a compared result of the second comparator.
A voltage converter for generating an output voltage signal, comprising:
- a controller for generating a control voltage signal according to the output voltage signal and a first reference voltage;
- a wave generator for generating a saw-wave signal, wherein a waveform of the saw-wave signal has at least two different slopes in a leading edge of each pulse of the saw-wave signal;
- a comparator for generating a pulse width modulation (PWM) signal according to the control voltage signal and the saw-wave signal;
- and
- a voltage converting unit for generating the output voltage signal according to the PWM signal.
A voltage generating method for generating an output voltage signal, comprising:
- providing a saw-wave signal with a waveform having at least two different slopes in a leading edge of each pulse of the saw-wave signal;
- comparing a control voltage signal with the saw-wave signal to generate a compared result;
- generating a pulse width modulation (PWM) signal according to the compared result;
- and
- generating the output voltage signal according to the PWM signal.
Dependencies are inferred from the claim text.