Control circuit, control method, DC-DC converter and electronic device
First Claim
1. A method for controlling a DC-DC converter operable in a continuous mode and in a discontinuous mode, the discontinuous mode comprising active and inactive durations, the method comprising:
- operating the DC-DC converter in the discontinuous mode;
measuring a first duration of an active duration and a second duration of an inactive duration;
judging whether a predefined criterion evaluated using the measured first duration and the measured second duration is satisfied; and
switching the DC-DC converter to operate in the continuous mode if the predefined criterion is satisfied,wherein a first switching frequency of charging and discharging the DC-DC converter operating in the continuous mode is different from a second switching frequency of charging and discharging the DC-DC converter during the active duration of the discontinuous mode.
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Accused Products
Abstract
A control circuit (115), a control method, a DC-DC converter and an electronic device are provided. The control circuit (115) is used to control the DC-DC converter to switch its operation modes. In the control circuit (115), whether mode of the DC-DC converter is to be switched is judged according to parameters of a first duration of an active duration and a second duration of an inactive duration. Comparison of analog values is prevented, and as a result, the use of the analog comparator is reduced, thus the influence of the semiconductor processes on designing a controller can be reduced.
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Citations
14 Claims
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1. A method for controlling a DC-DC converter operable in a continuous mode and in a discontinuous mode, the discontinuous mode comprising active and inactive durations, the method comprising:
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operating the DC-DC converter in the discontinuous mode; measuring a first duration of an active duration and a second duration of an inactive duration; judging whether a predefined criterion evaluated using the measured first duration and the measured second duration is satisfied; and switching the DC-DC converter to operate in the continuous mode if the predefined criterion is satisfied, wherein a first switching frequency of charging and discharging the DC-DC converter operating in the continuous mode is different from a second switching frequency of charging and discharging the DC-DC converter during the active duration of the discontinuous mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A DC-DC converter operable in a continuous mode and in a discontinuous mode, the discontinuous mode comprising active and inactive durations, the DC-DC converter comprising:
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an input node, an output node, and a first switch, a second switch, an inductor, a capacitor, a control circuit connected between the input node and the output node, wherein the control circuit is configured to; switch the DC-DC converter between the continuous mode and the discontinuous mode; switch the DC-DC converter between an active duration and an inactive duration of the discontinuous mode; measure a first duration of the active duration and a second duration of the inactive duration; judge whether a predefined criterion evaluated using the measured first duration and the measured second duration is satisfied; and if the predefined criterion is satisfied, switch the DC-DC converter from the discontinuous mode to the continuous mode, wherein a first switching frequency of charging and discharging the DC-DC converter operating in the continuous mode is different from a second switching frequency of charging and discharging the DC-DC converter during the active duration of the discontinuous mode. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification