Back to results
US 10,804,890 B2Granted
Control of a pass switch by a current source
AssigneeInfineon Technologies Austria AG
InventorsXiaowu Gong, Andrey Malinin
Life of this patent
Estimating the term…
Abstract
In some examples, a controller is configured to control a power switch electrically connected in series with a winding. In some examples, the controller is also configured to control a pass switch electrically connected between an output node of the winding and a bus out node. In some examples, the controller includes a current source configured to selectively drive a charging current from an intermediate node between the power switch and the winding to a control terminal of the pass switch to turn on the pass switch.
Claims20
A controller configured to:
- control a power switch electrically connected in series between a winding and a voltage rail;
- and
- control a pass switch electrically connected between an output node of the winding and a bus out node,
- wherein the pass switch is electrically connected between a smoothing capacitor and the bus out node,
- wherein a load terminal of the pass switch is directly electrically connected to the bus out node, and
- wherein the controller comprises a current source configured to selectively drive a charging current from an intermediate node between the power switch and the winding to a control terminal of the pass switch to turn on the pass switch.
3 more elements
A method comprising:
- controlling, by a controller, a power switch electrically connected in series between a winding and a voltage rail;
- and
- controlling, by the controller, a pass switch electrically connected between an output node of the winding and a bus out node,
- wherein the pass switch is electrically connected between a smoothing capacitor and the bus out node,
- wherein a load terminal of the pass switch is directly electrically connected to the bus out node, and
- wherein controlling the pass switch comprises selectively driving, by a current source of the controller, a charging current from an intermediate node between the power switch and the winding to a control terminal of the pass switch to turn on the pass switch.
3 more elements
A system comprising:
- primary-side circuitry including:
- a primary-side switch;
- a primary-side winding of a transformer, and
- a primary-side controller configured to control the primary-side switch;
- and
- secondary-side circuitry including:
- a secondary-side switch;
- a secondary-side winding of the transformer magnetically coupled to the primary side and electrically connected in series with the secondary-side switch through an intermediate node;
- a voltage rail, wherein the secondary-side switch is electrically connected in series between the secondary-side winding and the voltage rail;
- a bus out node configured to deliver electrical power to an electrical load;
- a pass switch configured to conduct electricity from an output node of the secondary-side winding to the bus out node, wherein the pass switch is electrically connected between a smoothing capacitor and the bus out node, wherein a load terminal of the pass switch is directly electrically connected to the bus out node;
- and
- a secondary-side controller configured to control the secondary-side switch and the pass switch, wherein the secondary-side controller comprises a current source configured to selectively drive a charging current from the intermediate node between the secondary-side switch and the secondary-side winding to a control terminal of the pass switch to turn on the pass switch.
10 more elements
Dependencies are inferred from the claim text.