# US 12,113,588 B2 · Initialization and synchronization for pulse power in a network system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,588 B2 - Document ID: US12113588B2 - Status: Granted - Kind: B2 - Application number: 17/171,723 - Filed: 2021-02-09 - Published: 2021-06-03 - Granted: 2024-10-08 - Earliest claimed: 2019-11-01 - Assignees: Cisco Technology, Inc. - Applicants: Cisco Technology, Inc. - Inventors: Douglas Paul Arduini; Sung Kee Baek; Richard Anthony O'Brien; Joel Richard Goergen; Chad M. Jones; Jason DeWayne Potterf; Ruqi Li - Web page: https://patentgrep.com/patent/US12113588B2 ## CPC - H04B 3/54: Systems for transmission via power distribution lines - G01R 31/083: {in cables, e.g. underground} - G01R 31/50: Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections (testing of sparking plugs H01T13/58) - G05B 9/02: electric - G06F 1/305: {in the event of power-supply fluctuations} - H02J 13/00: Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network - H02J 13/16: the power network being controlled at grid-level, e.g. using aggregators - H04L 12/10: Current supply arrangements - H04L 12/40045: {Details regarding the feeding of energy to the node from the bus} - H04B: TRANSMISSION - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In one embodiment, a method includes receiving low voltage pulse power from power sourcing equipment at a powered device, synchronizing the powered device with a waveform of the low voltage pulse power received from the power sourcing equipment, and operating the powered device with high voltage pulse power received from the power sourcing equipment. ## Claims ### Claim 1 A method comprising: receiving first pulse power from power sourcing equipment at a powered device; synchronizing the powered device with a waveform of the first pulse power received from the power sourcing equipment; and operating the powered device with second pulse power received from the power sourcing equipment, wherein the first pulse power is at a power level lower than a power level of the second pulse power, and wherein receiving the first pulse power and synchronizing are performed for each phase of a multi-phase pulse power system. ### Claim 2 (depends on 1) The method of claim 1 further comprising starting up a transceiver at the powered device for communication with the power sourcing equipment before receiving the second pulse power. ### Claim 3 (depends on 1) The method of claim 1, wherein said synchronizing the powered device comprises synchronizing the powered device such that a modulator switch at the power sourcing equipment is turned on before a modulator switch at the powered device is turned on and the modulator switch at the powered device is turned off before the modulator switch at the power sourcing equipment is turned off. ### Claim 4 (depends on 1) The method of claim 1 further comprising starting up a housekeeping circuit upon receiving the first pulse power from the power sourcing equipment over a fixed time period. ### Claim 5 (depends on 1) The method of claim 1 further comprising disabling a first housekeeping circuit upon receiving the second pulse power and operating a second housekeeping circuit for the second pulse power. ### Claim 6 (depends on 1) The method of claim 1 wherein the first pulse power comprises pulses of power transmitted at or below 60 volts. ### Claim 7 (depends on 1) The method of claim 1 wherein a difference between the first pulse power and the second pulse power is at least 170 volts. ### Claim 8 (depends on 1) The method of claim 1 further comprising negotiating a power level with the power sourcing equipment. ### Claim 9 (depends on 1) The method of claim 1 wherein the power sourcing equipment performs a safety test before transmitting the second pulse power. ### Claim 10 (depends on 1) The method of claim 1 further comprising transmitting the second pulse power to a second powered device. ### Claim 11 (depends on 1) The method of claim 1, wherein the first pulse power comprises a first waveform of pulses of a first level with on and off periods of a duty cycle, and the second pulse power comprises a second waveform of pulses of a second level with on and off periods of a duty cycle. ### Claim 12 A method comprising: receiving pulse power from power sourcing equipment at a powered device with a modulator switch open; coupling isolated voltage at the powered device when a pulse of the pulse power is on; energizing a housekeeping circuit at the powered device; and turning on the modulator switch at the powered device after a specified number of pulses of the pulse power are received to power the powered device with the pulse power. ### Claim 13 (depends on 12) The method of claim 12 wherein the power sourcing equipment checks for normal operation of the modulator switch at the powered device and turns off the pulse power if normal operation is not confirmed. ### Claim 14 (depends on 12) The method of claim 12 wherein the powered device is hot swapped into a network comprising the power sourcing equipment before receiving the pulse power. ### Claim 15 (depends on 12) The method of claim 12 wherein the pulse power received with the modulator switch open comprises a short pulse On-time and wherein the pulse power received after the modulator switch is turned on comprises a normal operation pulse On-time. ### Claim 16 (depends on 12) The method of claim 12 further comprising synchronizing timing of the modulator switch with a power sourcing equipment modulator switch. ### Claim 17 A powered device comprising: an input for receiving first pulse power from power sourcing equipment at the powered device; a modulator switch; and a controller for synchronizing the powered device with a waveform of the first pulse power received from the power sourcing equipment and switching to operation with second pulse power, wherein the controller is configured to turn on the modulator switch after a modulator switch at the power sourcing equipment is turned on and to turn off the modulator switch at the powered device before the modulator switch at the power sourcing equipment is turned off, wherein the first pulse power is at a power level lower than a power level of the second pulse power. ### Claim 18 (depends on 17) The powered device of claim 17 wherein the controller is operable to start up a transceiver at the powered device for communication with the power sourcing equipment before receiving the second pulse power from the power sourcing equipment. ### Claim 19 (depends on 17) The powered device of claim 17 wherein the controller is operable to start up a housekeeping circuit upon receiving low voltage power from the power sourcing equipment over a fixed time period before receiving the second pulse power. ### Claim 20 (depends on 17) The powered device of claim 17, wherein the first pulse power comprises a first waveform of pulses of a first level with on and off periods of a duty cycle, and the second pulse power comprises a second waveform of pulses of a second level with on and off periods of a duty cycle.