Constant on-time converter with frequency control
AssigneeSilanna Asia Pte Ltd
InventorsRawinder Dharmalinggam, Tiong Lim
Life of this patent
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Abstract
An improved power converter produces power through a power switch in response to an activation signal that has an on-time and a switching frequency. An on-time signal has a constant on-time and controls the on-time of the activation signal. An error signal indicates that the switching frequency is not equal to a reference frequency. A step up signal and a step down signal are based on the error signal. A count signal is increased in response to the step up signal and decreased in response to the step down signal. An on-time pulse has a duration that is related to a value of the count signal. The on-time pulse controls the constant on-time of the on-time signal and maintains the switching frequency at about the reference frequency.
Claims20
A frequency controller comprising:
- a pulse generator producing a pulse having a duration that is related to a value of a count signal that is changed based on a switching frequency relative to a reference frequency, the pulse generator providing the pulse to a feedback loop to control a signal generated by the feedback loop and to maintain the switching frequency at about the reference frequency.
A power converter comprising:
- a frequency controller producing a pulse having a duration that is related to a value of a count signal that is changed based on a switching frequency relative to a reference frequency, the frequency controller providing the pulse to a feedback loop to control a signal generated by the feedback loop and to maintain the switching frequency at about the reference frequency, the signal controlling an activation signal, and the activation signal having the switching frequency and being used to generate an output voltage of the power converter.
A method comprising:
- producing a pulse having a duration that is related to a value of a count signal that is changed based on a switching frequency relative to a reference frequency;
- and
- controlling, based on the pulse, a signal that controls an activation signal, the activation signal having the switching frequency and being used by a power converter to generate an output voltage, the controlling of the signal resulting in maintaining the switching frequency at about the reference frequency.
Dependencies are inferred from the claim text.