Isolated power converter with output voltage protection
AssigneeNXP B.V.
InventorsWilhelmus Hinderikus Maria Langeslag, Jeroen Kleinpenning
Life of this patent
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Abstract
An apparatus for delivering power to a load, which comprises an isolated power converter that converts input power on a primary side to output power and a supply voltage at a node on a secondary side. On the secondary side, a load switch is located on a current path to the load. A secondary-side control circuitry controls the load switch to operate in an ON mode in which current is provided to the load, and in response to a fault condition corresponding to an effective sudden disconnection of the supply voltage, switches the load switch into an OFF mode in which the current path to the load is blocked.
Claims20
An apparatus for delivering power to a load having load circuitry configured to draw power from the apparatus, the apparatus comprising:
- an isolated power converter configured and arranged to convert input power at a primary side of the isolated power converter to output power and a supply voltage at a node on a secondary side of the isolated power converter;
- on the primary side of the isolated power converter, primary-side control circuitry configured and arranged to limit an extent to which the isolated power converter is capable of supplying power for providing the supply voltage at an output;
- on the secondary side of the isolated power converter, a load switch configured and arranged along a current path between the node and the load having load circuitry configured to draw power from the apparatus;
- and
- on the secondary side of the isolated power converter, secondary-side control circuitry configured and arranged to receive the supply voltage and to control the load switch to operate in an ON mode in which the current path is used to provide current to the load, and in response to a fault condition corresponding to an effective sudden disconnection of the supply voltage, switches the load switch into an OFF mode in which the current path to the load is blocked.
An apparatus for delivering power to a load having load circuitry configured to draw power from the apparatus, the apparatus comprising:
- an isolated power converter configured and arranged to convert input power on a primary side of the isolated power converter to output power and a supply voltage at a node on a secondary side of the isolated power converter;
- on the primary side of the isolated power converter, a primary-side control circuitry configured and arranged to limit an extent to which the isolated power converter is capable of supplying power for providing the supply voltage;
- on the secondary side of the isolated power converter, a load switch configured and arranged along a current path between the node and the load having load circuitry configured to draw power from the apparatus;
- and
- on the secondary side of the isolated power converter,
- circuitry configured and arranged to draw power during the ON mode, and
- a USB power-delivery controller circuit configured and arranged to receive the supply voltage and to a control the load switch to operate in an ON mode in which the current path is used to provide current to the load, and in response to a fault condition of the supply voltage corresponding to an effective sudden disconnection, in the form of a short circuit or an open circuit, switches the load switch into an OFF mode in which the current path to the load is blocked using the power drawn by the circuitry.
A method comprising:
- converting input power on a primary side of an isolated power converter to output power and a supply voltage at a node on a secondary side of the isolated power converter, wherein the supply voltage is one of multiple voltages that is selected based on feedback from a load to the secondary side;
- receiving the supply voltage at the node and passing the supply voltage along a current path from the node to the load;
- in response to a presence of the supply voltage at a secondary-side control circuitry, controlling a load switch to operate in an ON mode in which the current path is used to provide current to the load;
- and
- in response to a fault condition of the supply voltage corresponding to an effective sudden disconnection, in a form of a short circuit or an open circuit,
- switching the load switch into an OFF mode in which the current path to the load is blocked, and
- causing the primary-side control circuitry to limit an extent to which the isolated power converter is capable of supplying power for providing the supply voltage in response to the load switch switching into the OFF mode.
Dependencies are inferred from the claim text.