# US 8,543,848 B2 · Reducing latency when activating a power supply unit

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- Number: US 8,543,848 B2
- Document ID: US8543848B2
- Status: Granted
- Kind: B2
- Application number: 12/886,711
- Filed: 2010-09-21
- Published: 2012-03-22
- Granted: 2013-09-24
- Earliest claimed: 2010-09-21
- Assignees: Oracle International Corporation
- Applicants: Michael Bushue; Drew G. Doblar
- Inventors: Michael Bushue; Drew G. Doblar
- Web page: https://patentgrep.com/patent/US8543848B2

## CPC

- H02M 1/36: Means for starting or stopping converters
- H02J 9/005: {using a power saving mode (for copiers G03G15/5004)}
- Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y04S 20/20: End-user application control systems
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

## Abstract

A method for reducing latency using a charging module when activating a power supply unit (PSU) among a plurality of PSUs in a power supply system. The method includes: Receiving, by the PSU from a power input feed, input power; receiving, from a supply bus shared by the plurality of PSUs, a first controlled signal designating a status of the PSU as standby; disabling, in response to the first controlled signal, a switching regulator of the PSU; receiving, from a voltage rail of the supply bus, charge flowing through a resistor of the charging module to maintain a charge of an output capacitor of the switching regulator; receiving a second controlled signal designating the status of the PSU as active; enabling the switching regulator; outputting a voltage from the PSU through the charging module to the voltage rail; and charging the output capacitor using the PSU.

## Claims

### Claim 1

A method for reducing latency using a charging module when activating a power supply unit (PSU) among a plurality of PSUs in a power supply system, the method comprising:
receiving, by the PSU from a power input feed, input power;
receiving, from a supply bus shared by the plurality of PSUs, a first controlled signal designating a status of the PSU as standby;
disabling, in response to the first controlled signal, a switching regulator of the PSU, wherein the switching regulator is configured to:
receive continuous power from a power factor correction module,
separate the continuous power into a plurality of discrete segments of power, and
send the plurality of discrete segments of power to the supply bus;
receiving, from a voltage rail of the supply bus, charge flowing through a resistor of the charging module to maintain a charge of an output capacitor of the switching regulator;
receiving, from the supply bus, a second controlled signal designating the status of the PSU as active;
enabling, in response to the second controlled signal, the switching regulator;
in response to enabling the switching regulator:
outputting a voltage from the PSU through the charging module to the voltage rail; and
charging the output capacitor using the PSU.

### Claim 2 (depends on 1)

The method of claim 1, wherein the charging module comprises a switch connected in parallel with the resistor between the voltage rail and the output capacitor.

### Claim 3 (depends on 2)

The method of claim 2, wherein the switch is a diode configured to prevent a flow of energy from the voltage rail to the output capacitor.

### Claim 4 (depends on 1)

The method of claim 1, wherein a resistance of the resistor is between 1,000 ohms and 10,000 ohms.

### Claim 5 (depends on 1)

The method of claim 1, wherein the latency from the status of the PSU as standby to the PSU outputting the voltage to the voltage rail is less than 2 milliseconds.

### Claim 6 (depends on 2)

The method of claim 2, further comprising:
opening, in response to disabling the switching regulator, the switch of the charging module; and
closing, in response to receiving the second controlled signal, the switch of the charging module.

### Claim 7 (depends on 6)

The method of claim 6, wherein the switch is a field-effect transistor.

### Claim 8 (depends on 1)

The method of claim 1, wherein the PSU is controlled by a control system for a power supply system to manage the PSUs in a manner that increases energy efficiency, the management being delegated to each PSU of the plurality of PSUs in the power supply system to allow each PSU to autonomously control its operation once initial thresholds and settings are received from the control system.

### Claim 9 (depends on 8)

The method of claim 8, wherein active standby OFF is the status when the PSU is in standby.

### Claim 10 (depends on 8)

The method of claim 8, wherein active ON is the status when the PSU is active.

### Claim 11

A system for reducing latency when activating a power supply unit (PSU) among a plurality of PSUs in a power supply system, the system comprising:
a supply bus comprising a voltage rail, the supply bus and voltage rail operatively connected to each PSU within the power supply system;
a plurality of power input feeds, wherein each of the plurality of power input feeds provides input voltage to one of the plurality of PSUs; and
the plurality of PSUs, wherein each of the plurality of PSUs comprises:
memory for storing instructions executed by a central processing unit (CPU),
a charging module comprising a resistor and a switch, and
a switching regulator comprising an output capacitor, wherein the switching regulator is configured to:
receive continuous power from a power factor correction module,
separate the continuous power into a plurality of discrete segments of power, and
send the plurality of discrete segments of power to the supply bus,
wherein the PSU is configured to:
receive input power from one of the plurality of power input feeds;
receive, from the supply bus, a first controlled signal designating the status of the PSU as standby;
disable, using the CPU and in response to the first controlled signal, the switching regulator;
receive, from the voltage rail, charge flowing through the resistor of the charging module to maintain a charge of the output capacitor of the switching regulator;
receive, from the supply bus, a second controlled signal designating the status of the PSU as active;
enable, using the CPU and in response to the second controlled signal, the switching regulator;
charge the output capacitor using the PSU; and
output voltage from the PSU through the charging module to the voltage rail.

### Claim 12 (depends on 11)

The system of claim 11, wherein a resistance of the resistor is between 1,000 ohms and 10,000 ohms.

### Claim 13 (depends on 11)

The system of claim 11, wherein the switch is connected in parallel with the resistor between the voltage rail and the output capacitor.

### Claim 14 (depends on 13)

The system of claim 13, wherein the switch is a diode configured to prevent a flow of energy from the voltage rail to the output capacitor.

### Claim 15 (depends on 13)

The system of claim 13, wherein the PSU is further configured to:
open, in response to disabling the switching regulator, the switch of the charging module; and
close, in response to enabling the switching regulator, the switch of the charging module.

### Claim 16 (depends on 15)

The system of claim 15, wherein the switch is a field-effect transistor.

### Claim 17

A power supply unit (PSU) comprising:
a charging module comprising a resistor and a switch and operatively connected to a supply bus;
a switching regulator comprising an output capacitor and operatively connected to the charging module, wherein the switching regulator is configured to:
receive continuous power from a power factor correction module,
separate the continuous power into a plurality of discrete segments of power, and
send the plurality of discrete segments of power to the supply bus;
an input stage comprising a plurality of components configured to:
receive input power from a power input feed;
receive, from the supply bus through the resistor of the charging module, a first controlled signal designating a status of the PSU as standby;
disable, in response to the first controlled signal, the switching regulator;
receive, from a voltage rail of the supply bus, charge flowing through the resistor of the charging module to maintain a charge of the output capacitor;
receive, from the supply bus, a second controlled signal designating the status of the PSU as active;
enable, in response to the second controlled signal, the switching regulator;
in response to enabling the switching regulator:
output a voltage from the input stage through the switch of the charging module to the voltage rail; and
charge the output capacitor using the voltage output from the input stage.

### Claim 18 (depends on 17)

The PSU of claim 17, wherein the plurality of components of the input stage comprise an electromagnetic interference filter, a rectifier, and a power factor correction module.

### Claim 19 (depends on 17)

The PSU of claim 17, wherein the switch and the resistor of the charging module are connected in parallel, wherein the switch is open for charge flowing from the supply bus to the switching regulator, and wherein the switch is closed for charge flowing from the switching regulator to the supply bus.

### Claim 20 (depends on 17)

The PSU of claim 17, wherein the output capacitor is sized to maintain a voltage that is substantially the same as a voltage of the voltage rail of the supply bus.