Method and apparatus for providing integrated low power self-supply in switched mode power supplies
AssigneeSemiconductor Components Industries, LLC
InventorsJosef Halamik, Jefferson W. Hall
Life of this patent
Estimating the term…
Abstract
A regulated self-supply power controller for a switched-mode power supply includes an operational voltage supply line having a voltage magnitude that varies between two voltage magnitudes. A controllable power source is intermittently coupled to a capacitor, which is coupled to the operational voltage supply line, on the basis of the variation of the operational voltage supply line voltage magnitude between the two voltage magnitudes.
Claims28
A method of regulating voltage on an operational voltage supply line in a switched-mode power supply self-supply controller, comprising:
- selectively routing a primary current to the operational voltage supply line to cycle the operational voltage supply line between a first voltage magnitude and a second voltage magnitude.
A self-supply power controller for a switched-mode power supply, comprising:
- a comparator circuit;
- an operational voltage supply line coupled to an input of said comparator circuit;
- and
- a controllable power source coupled to an output of said comparator circuit, said controllable power source being controlled by said comparator circuit to be selectively electrically coupled to said operational voltage supply line to cycle the operational voltage supply line between a first voltage magnitude and a second voltage magnitude.
An integrated circuit (IC) for use in regulating a switched-mode power supply, said IC being contained within an IC package including at least a switching pin, a reference potential pin, an operational voltage supply pin, and a feedback pin, said IC comprising:
- a controllable power source circuit including an input coupled to said switching pin;
- a controller including at least a feedback connection coupled to said feedback pin;
- a controllable switching device coupled to an output of, said controller and being controlled by said controller to selectively couple said switching pin to said reference potential pin;
- and
- a comparator circuit including an input coupled to said operational voltage supply pin and an output coupled to a control terminal of said controllable power source circuit, wherein said comparator circuit controls said controllable power source circuit to selectively couple an output of said controllable power source circuit to said operational voltage supply pin to cycle said operational voltage supply pin between a first voltage magnitude and a second voltage magnitude.
An integrated power supply controller operating from a supply voltage on a supply line, comprising:
- a control circuit having an output for switching a primary current to develop an output voltage at a node;
- and
- a comparator for comparing the supply voltage to a reference voltage for routing the primary current to charge the supply line to a second voltage, wherein the supply line discharges to a first voltage through the integrated power supply controller.
A method of regulating an output voltage, comprising:
- driving a switch with a controller to develop the output voltage at a node;
- turning off the switch to charge a supply line from a first voltage magnitude to a second voltage magnitude with the primary current;
- and
- discharging the supply line from the second voltage magnitude to the first voltage magnitude through the controller.
Dependencies are inferred from the claim text.