Multi-Mode Operation and Control of a Resonant Converter
First Claim
1. A method of controlling a switched-mode power supply, the method comprising:
- generating a feedback signal proportional to an output of the switched-mode power supply;
operating the switched-mode power supply in a normal mode comprising adjusting a pulse modulated signal to regulate a feedback signal to a first signal level;
if the feedback signal crosses a first threshold, operating the switched-mode power supply in a second operating mode comprising, adjusting a dead-time of the pulse modulated signal to regulate a feedback signal to a second signal level different from the first signal level; and
driving a switch of the switched-mode power supply with the pulse modulated signal.
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Abstract
In accordance with an embodiment, a method of controlling a switched-mode power includes generating a feedback signal proportional to an output of the switched-mode power supply, and operating the switched-mode power supply in a normal mode. If the feedback signal crosses a first threshold, the switched-mode power operates in a second operating mode. In the first operating mode the pulse modulated signal is adjusted to regulate a feedback signal to a first signal level, and in the second operating mode, a dead-time of the pulse modulated signal is adjusted to signal to regulate a feedback signal to a second signal level different from the first signal level. The method further includes driving a switch of the switched-mode power supply with the pulse modulated signal.
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Citations
22 Claims
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1. A method of controlling a switched-mode power supply, the method comprising:
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generating a feedback signal proportional to an output of the switched-mode power supply; operating the switched-mode power supply in a normal mode comprising adjusting a pulse modulated signal to regulate a feedback signal to a first signal level; if the feedback signal crosses a first threshold, operating the switched-mode power supply in a second operating mode comprising, adjusting a dead-time of the pulse modulated signal to regulate a feedback signal to a second signal level different from the first signal level; and driving a switch of the switched-mode power supply with the pulse modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A switch controller for a switched-mode power supply, the controller comprising:
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a first threshold detector coupled to a feedback signal of the switched-mode power supply; a switching signal generator coupled to a feedback signal input and to an output of the first threshold detector, the switching signal generator configured to; generate a first pulse modulated signal in a normal operating mode to regulate a feedback signal to a first signal level; transition to a second operating mode when the output of the first threshold detector indicates that the feedback signal has crossed the first threshold; generate a second pulse modulated signal in a second operating mode to regulate a feedback signal to a second signal level by adjusting a dead-time of the pulse modulated signal, wherein the second signal level is different from the first signal level. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A switched mode power supply system comprising:
a switching controller comprising; a first threshold detector coupled to a feedback signal of the switched-mode power supply; a switching signal generator coupled to a feedback signal input and to an output of the first threshold detector, the switching signal generator configured to; generate a first pulse modulated signal in a normal operating mode to regulate a feedback signal to a first signal level; transition to a second operating mode when the output of the first threshold detector indicates that the feedback signal is has crossed the first threshold; generate a second pulse modulated signal in a second operating mode to regulate a feedback signal to a second signal level by adjusting a dead-time of the pulse modulated signal, wherein the second signal level is different from the first signal level. - View Dependent Claims (19, 20, 21, 22)
Specification