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US 11,456,661 B2Granted
Starting of a switched-mode power supply
AssigneeSTMicroelectronics (Rousset) SAS
InventorsSebastien Ortet, Cedric Thomas
Life of this patent
Estimating the term…
Abstract
The process for starting a power supply circuit which includes a switched-mode power supply is performed using: a first phase during which, if an output voltage of the switched-mode power supply is lower than a first voltage, the switched-mode power supply operates in pulse width modulation mode to increase its output voltage up to said first voltage; and when the output voltage has reached the first voltage, a second phase during which the switched-mode power supply operates in a bypass mode.
Claims9
A method of starting a power supply circuit that includes a switched-mode power supply, comprising:
- operating the power supply circuit in a first phase wherein bypass of the switched-mode power supply to generate an output voltage from an input voltage is requested;
- setting a comparison voltage in the first phase to a first level that is less than the input voltage;
- generating a start voltage that is equal to the output voltage;
- then operating the power supply circuit in a second phase wherein the switched-mode power supply is controlled using pulse width modulation to cause an increase in the output voltage;
- increasing the start voltage in accordance with a ramp while in the second phase;
- comparing the ramping start voltage to the comparison voltage in the second phase;
- and
- when the ramping start voltage reaches the comparison voltage, then operating the power supply circuit in a third phase wherein the switched-mode power supply is bypassed to generate the output voltage from the input voltage.
5 more elements
A power supply circuit, comprising:
- a switched-mode power supply receiving an input voltage and generating an output voltage;
- and
- a circuit including a comparator circuit having an input receiving the comparison voltage, said circuit configured to start the power supply circuit by:
- operating in a first phase wherein bypass of the switched-mode power supply to generate the output voltage from the input voltage is requested;
- generating a start voltage that is equal to the output voltage;
- setting the comparison voltage in the first phase to a first level that is less than the input voltage;
- then operating in a second phase wherein the switched-mode power supply is controlled using pulse width modulation to cause an increase in the output voltage;
- increasing the start voltage in accordance with a ramp during in the second phase;
- comparing the ramping start voltage to the comparison voltage during the second phase;
- and
- when the ramping start voltage reaches the comparison voltage, then operating in a third phase wherein the switched-mode power supply is bypassed to generate the output voltage from the input voltage.
8 more elements
A method of starting a power supply circuit that includes a switched-mode power supply, comprising:
- operating the power supply circuit in a first phase including:
- generating a start voltage that is equal to an output voltage of the switched-mode power supply;
- and
- first comparing the start voltage to a comparison voltage set at a first level that is less than an input voltage of the switched-mode power supply;
- when the start voltage is less than the comparison voltage in the first comparing, then:
- operating the power supply circuit in a second phase wherein the switched-mode power supply is controlled using pulse width modulation to cause an increase in the output voltage;
- conversely, when the start voltage is more than the comparison voltage in the first comparing, then:
- increasing the comparison voltage to a second level that is greater than the first level;
- and
- second comparing the start voltage to the comparison voltage set at the second level;
- when the start voltage is more than the comparison voltage in the second comparing, then:
- operating the power supply circuit in a third phase wherein the switched-mode power supply is bypassed to generate the output voltage from the input voltage;
- conversely, when the start voltage is less than the comparison voltage in the second comparing, then:
- operating the power supply circuit in the second phase wherein the switched-mode power supply is controlled using pulse width modulation to cause the increase in the output voltage.
11 more elements
Dependencies are inferred from the claim text.