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US 9,804,616 B2Granted
Single-shot duty cycle generator for a switched-mode power supply
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorVratislav Michal
Life of this patent
Estimating the term…
Abstract
A switched-mode power supply device includes a power switch configured to transfer power from a supply line to a load in switched-mode; a first oscillator configured to operate at a frequency proportional to a voltage of the supply line; a second oscillator configured to operate at a frequency proportional to a voltage of the load; and a regulator configured to operate the power switch according to a duty cycle based on a ratio between the first and second oscillator frequencies.
Claims11
A switched-mode power supply device comprising:
- a power switch configured to transfer power from a supply line to a load in switched-mode;
- and
- a duty cycle generator that includes:
- a first oscillator configured to operate at a frequency proportional to a voltage of the supply line;
- and
- a second oscillator configured to operate at a frequency proportional to a voltage of the load;
- wherein:
- the duty cycle generator is configured to operate the power switch according to a duty cycle based on a ratio between the first and second oscillator frequencies.
5 more elements
A device comprising:
- a first oscillator configured to operate at a frequency proportional to a first voltage;
- a first counter configured to count cycles of the first oscillator;
- a second oscillator configured to operate at a frequency proportional to a second voltage smaller than the first voltage;
- a second counter configured to count cycles of the second oscillator;
- a clock circuit configured to reset the first and second counters at clock cycle transitions;
- a latch configured to store content of the second counter at clock cycle transitions;
- and
- a comparator configured to enable an output signal while content of the first counter is smaller than the content of the latch.
5 more elements
A switched-mode power supply comprising:
- an inductor configured to supply a load;
- and
- a switched-mode power supply device configured to drive the inductor, the switched-mode power supply device including:
- a power switch configured to transfer power from a supply line to the load in switched-mode;
- and
- a duty cycle generator that includes:
- a first oscillator configured to operate at a frequency proportional to a voltage of the supply line;
- a second oscillator configured to operate at a frequency proportional to a voltage of the load;
- wherein:
- the duty cycle generator is configured to operate the power switch according to a duty cycle based on a ratio between the first and second oscillator frequencies.
7 more elements
Dependencies are inferred from the claim text.