Cisco Technology, Inc.

Kan Seto

Yang Li

Shobhana Punjabi

Michael Grant

Jessica Kiefer

Joel Richard Goergen

Richard Anthony O'Brien

Paul Lachlan Mantiply

Straty Argyrakis

Ruqi Li

Qiuhua Zhu

Haitao Liu

Robert Ballenger

Matt Howard

Yingchun Ru

In one embodiment, an apparatus generally comprises a printed circuit board comprising a first side, a second side, and a plurality of power vias extending from the first side to the second side, the first side configured for receiving an application specific integrated circuit (ASIC), and a power delivery board mounted on the second side of the printed circuit board and comprising a power plane interconnected with power vias in the power delivery board to electrically couple voltage regulator modules and the ASIC. The voltage regulator modules are mounted on the second side of the printed circuit board.

Integrated power delivery board for delivering power to an ASIC with bypass of signal vias in a printed circuit board

In one embodiment, an apparatus generally comprises a power delivery board for integration with a printed circuit board, the power delivery board comprising a power plane for delivering power from a voltage regulator module to an application specific integrated circuit (ASIC) mounted on a first side of the printed circuit board. The power plane in the power delivery board interconnects with power vias in the power delivery board for vertical alignment with the ASIC through power vias in the printed circuit board to electrically couple the voltage regulator module and the ASIC when the power delivery board is mounted on a second side of the printed circuit board.

In one embodiment, a hot swap circuit is disclosed. The hot swap circuit includes a first switch connected to a power input line. The hot swap circuit also includes a first capacitor connected to the first switch that is charged when the first switch is closed. The hot swap circuit further includes a second switch connected to the first switch and the first capacitor. The hot swap circuit additionally includes an input capacitor connected to the second switch and located in parallel with an input line to a power system. When the second switch is closed, the input capacitor is charged.

Hot swap circuit

In one embodiment, a hot swap circuit is disclosed. The hot swap circuit includes a capacitor in parallel with an input line to a power system. The hot swap circuit also includes a switch in parallel with the input line to the power system and coupled to the capacitor. The hot swap circuit further includes circuitry configured to pre-charge the capacitor to a first voltage while the switch is open. The switch is operable to cause the capacitor to be charged from the first voltage to a second voltage when the switch is closed.

In one embodiment, a power apparatus includes a buck converter including a first capacitor, a first inductor and a first switch for connection with a direct current power supply, wherein when the first switch is closed and the buck converter is connected to the direct current power supply, the first capacitor and the first inductor are connected in series to the direct current power supply, a full-bridge inverter including at least four switches including the first switch, a second, third and fourth switch so that the first switch is shared by the inventor and buck converter, the inverter being operative to convert direct current to alternating current by alternating (a) closing the first and fourth switch with the second and third switch open, and (b) closing the second and third switch with the first and fourth switch open, and a transformer to step down an output of the inverter.

Inrush control power supply

An apparatus may be provided. The apparatus may comprise a first circuit portion, a second circuit portion, and a third circuit portion. The first circuit portion may comprise a voltage supply having an input voltage level (V) and a first switch. The second circuit portion may comprise a plurality of parallel paths. The third circuit portion may comprise a second switch and a third switch. The plurality of parallel paths may supply a portion of the input voltage level when the first switch is open, the second switch is closed, and the third switch is open.

Buck circuit

An apparatus and method for significantly reducing the initial set-point error and voltage margining accuracy of a DC/DC converter. The initial set-point error is reduced by utilizing the remote sense lines of a DC/DC converter to sense the voltage from the DC/DC converter that is actually applied to the load. A power supply controller having inputs coupled to the remote sense lines compares the sensed voltage to a precision voltage reference and provides an output voltage to the TRIM input of the DC/DC converter. The apparatus and method may be implemented in a voltage supply margining test set-up to test the functionality of an electronic device while the DC/DC converter supplies a voltage to the device that is at either the upper or lower margin of an acceptable supply voltage range of the device.

Growing community of inventors

Saratoga, CA, United States of America

Kan Seto