Soft start with active reset
First Claim
1. A power supply input circuit comprising:
- an input node configured to removeably couple to a plurality of electrical power sources including a wireless electrical power source;
a solid state switch coupled between the input node and a capacitive load that is coupled to a power rail, wherein the capacitive load is sized to permit the wireless electrical power source to power a load coupled to the power rail;
an RC soft start circuit coupled to the solid state switch, the RC soft start circuit having a capacitor that causes the solid state switch to increasingly pass electrical power from one of the plurality of the electrical power sources to the capacitive load as the capacitor charges from the one of the plurality of the electrical power sources; and
an active reset circuit coupled to the RC soft start circuit, the active reset circuit configured to detect when the one of the plurality of the electrical power sources is decoupled from the input node and, in response, discharges the capacitor to actively reset the soft start circuit.
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Accused Products
Abstract
A power supply input circuit includes an input node configured to removeably couple to an electrical source. A solid state switch is coupled between the input node and a capacitive load. An RC soft start circuit is coupled to the input node and the switch. The soft start circuit has a capacitor that causes the switch to increasingly pass electrical power from the source to the load as the capacitor charges from the source. An active reset circuit is coupled to the soft start circuit. The reset circuit is configured to detect when the source is removed from the input node and in response to the source being removed from the input node, the reset circuit discharges the capacitor to reset the soft start circuit.
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Citations
20 Claims
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1. A power supply input circuit comprising:
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an input node configured to removeably couple to a plurality of electrical power sources including a wireless electrical power source; a solid state switch coupled between the input node and a capacitive load that is coupled to a power rail, wherein the capacitive load is sized to permit the wireless electrical power source to power a load coupled to the power rail; an RC soft start circuit coupled to the solid state switch, the RC soft start circuit having a capacitor that causes the solid state switch to increasingly pass electrical power from one of the plurality of the electrical power sources to the capacitive load as the capacitor charges from the one of the plurality of the electrical power sources; and an active reset circuit coupled to the RC soft start circuit, the active reset circuit configured to detect when the one of the plurality of the electrical power sources is decoupled from the input node and, in response, discharges the capacitor to actively reset the soft start circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An information handling system (IHS) comprising:
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a processor; a memory device coupled to the processor; and a power supply input circuit coupled to the processor and the memory device, the power supply input circuit comprising; an input node configured to removeably couple to a plurality of electrical power sources including a wireless electrical power source; a solid state switch coupled between the input node and a capacitive load that is coupled to the processor and the memory device, wherein the capacitive load is sized to permit the wireless electrical power source to power the processor and the memory device; an RC soft start circuit coupled to the solid state switch, the RC soft start circuit having a capacitor that causes the solid state switch to increasingly pass electrical power from one of the plurality of the electrical power sources to the capacitive load as the capacitor charges from the one of the plurality of the electrical power sources; and an active reset circuit coupled to the RC soft start circuit, the active reset circuit configured to detect when the one of the plurality of the electrical power sources is decoupled from the input node and, in response, discharges the capacitor to actively reset the soft start circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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providing a solid state switch between an input node and a capacitive load that is coupled to a power rail, wherein the capacitive load is sized to permit a wireless electrical power source to power a load coupled to the power rail; receiving power by an RC soft start circuit from one of a plurality of electrical power sources coupled to the input node, wherein the RC soft start circuit causes the switch to increasingly pass power from the one of the plurality of electrical power sources to the capacitive load; and detecting when the one of the plurality of electrical power sources is decoupled from the input node and, in response, actively resetting the RC soft start circuit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification