公开(公告)号：US20190068069A1

公开(公告)日：2019-02-28

申请号：US15693393

申请日：2017-08-31

Applicant: Google Inc.

Inventor： Honggang Sheng ,  Liang Jia ,  Srikanth Lakshmikanthan

IPC: H02M3/335

Abstract: In some implementations, a programmable power adapter includes a first set of switches, a resonant circuit, a transformer, and a second set of switches. The power adapter includes control circuitry configured to provide control signals that change the voltage conversion ratios of the first set of switches and the second set of switches. The control circuitry can provide control signals causing the first set of switches to operate in one of multiple operating modes that each correspond to a different voltage conversion ratio, and the control circuitry can provide control signals causing the second set of switches to operate in one of multiple operating modes that each correspond to a different voltage conversion ratio.

公开(公告)号：US20180166873A1

公开(公告)日：2018-06-14

申请号：US15375833

申请日：2016-12-12

Applicant: Google Inc.

Inventor： Liang Jia ,  Xin Li

IPC: H02H3/28 ,  H02H9/00 ,  H02H9/04 ,  G06F1/26

CPC classification number: H02H3/28 ,  G06F1/26 ,  H02H9/005 ,  H02H9/04 ,  H02J1/06 ,  H03K17/08122

Abstract: A protection circuits for server racks may include an Oring circuit having a first MOSFET, a first diode, and first and second comparators. Each of the first and second comparators supports a maximum voltage difference that is less than an operational voltage of the power supply. The protection circuit also includes a clamping circuit having a second MOSFET and a second diode. Each of the first and second comparators is configured to compare voltage at the first MOSFET with voltage at the second MOSFET. The first comparator is configured to switch the first MOSFET to an off condition using the comparison, and the second comparator is configured to switch the first MOSFET to an on condition using the comparison. The second MOSFET is configured to clamp a node of each of the first and second comparators to below the maximum in the event of a short at the power supply.

公开(公告)号：US20190068071A1

公开(公告)日：2019-02-28

申请号：US15693055

申请日：2017-08-31

Applicant: Google Inc.

Inventor： Liang Jia ,  Srikanth Lakshmikanthan

IPC: H02M3/335 ,  H02M1/14

Abstract: This specification describes a device that includes a voltage-regulated DC-DC converter comprising a switching network, a resonant circuit, and control circuitry, wherein the switching network has a switching frequency. The DC-DC converter has an output impedance and the control circuity uses a control loop to control the DC-DC converter. The control circuitry implements the control loop using: an output voltage sensor configured to sense an output voltage of the DC-DC converter; and a compensator configured to adjust operation of the DC-DC converter based on the output voltage sensed by the output voltage sensor. The DC-DC converter comprises an output impedance suppression mechanism configured to at least partially suppress increases in the output impedance of the DC-DC converter.