# US 10,481,663 B2 · Managing the operation of power supply units (PSUs) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,663 B2 - Document ID: US10481663B2 - Status: Granted - Kind: B2 - Application number: 15/715,788 - Filed: 2017-09-26 - Published: 2019-03-28 - Granted: 2019-11-19 - Earliest claimed: 2017-09-26 - Assignees: Dell Products L.P. - Applicants: Dell Products, L.P. - Inventors: Wayne Kenneth Cook; John Erven Jenne; Kyle E. Cross - Web page: https://patentgrep.com/patent/US10481663B2 ## CPC - G06F 1/28: Supervision thereof, e.g. detecting power-supply failure by out of limits supervision - G06F 1/266: {Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips} - G06F 1/305: {in the event of power-supply fluctuations} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Systems and methods for managing the operation of Power Supply Units (PSUs) are described. In some embodiments, a method may include: identifying a mismatch between a first Power Supply Unit (PSU) and a second PSU in an Information Handling System (IHS), disabling the first PSU, determining that a voltage at an input line of the first PSU follows a predetermined pattern while the first PSU receives a secondary bias from the second PSU, and enabling the first PSU. ## Claims ### Claim 1 A method, comprising: identifying a mismatch between a first Power Supply Unit (PSU) and a second PSU in an Information Handling System (IHS); disabling the first PSU; determining that a voltage at an input line of the first PSU follows a predetermined pattern while the first PSU receives a secondary bias from the second PSU; and enabling the first PSU. ### Claim 2 (depends on 1) The method of claim 1, wherein the mismatch is identified by a Baseband Management Controller (BMC) coupled to the first and second PSUs. ### Claim 3 (depends on 2) The method of claim 2, wherein the mismatch is identified based upon a comparison between a line status of the input line reported to the BMC by the first PSU, and another line status of another second input line reported to the BMC by the second PSU. ### Claim 4 (depends on 1) The method of claim 1, wherein the predetermined pattern comprises: a drop from a first high-voltage level to a low-voltage level; and a rise from the low-voltage level to a second high-voltage level. ### Claim 5 (depends on 4) The method of claim 4, wherein the low-voltage level is 0 V. ### Claim 6 (depends on 5) The method of claim 5, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level is selected to model: (i) coupling a power cable to a first power source, wherein the power cable is coupled to an input line, (ii) decoupling the power cable from the first power source, and (iii) coupling the power cable to a second power source. ### Claim 7 (depends on 6) The method of claim 6, wherein the second high-voltage level has a higher value than the first high-voltage level. ### Claim 8 (depends on 5) The method of claim 5, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level is selected to model: (i) coupling a first power cable to an input line, wherein the first power cable is coupled to a first power source, (ii) decoupling the first power cable from the input line, and (iii) coupling a second power cable to the input line, wherein the second power cable is coupled to a second power source. ### Claim 9 (depends on 4) The method of claim 4, wherein the voltage drop includes the low-voltage level staying below 2 V for at least 500 ms. ### Claim 10 (depends on 9) The method of claim 9, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level is selected to model a voltage drop at the input line due to a power failure. ### Claim 11 (depends on 1) The method of claim 1, wherein the identifying, disabling, determining, and enabling operations occur while the first PSU is coupled to the IHS. ### Claim 12 A hardware memory device having program instructions stored thereon that, upon execution by a Baseband Management Controller (BMC) of an Information Handling System (IHS), cause the BMC to: identify a first mismatch between a first line status of a first input line of a first Power Supply Unit (PSU) and a second line status of a second input line of a second PSU, wherein the first and second PSUs are configured to provide power to the IHS, and wherein the second PSU provides a secondary bias to the first PSU; disable the first PSU in response to the mismatch; and enable the first PSU in response to an evaluation of the first input line without loss of the secondary bias. ### Claim 13 (depends on 12) The hardware memory device of claim 12, wherein the first line status is reported to the BMC by the first PSU, wherein the second line status is reported to the BMC by the second PSU, and wherein the evaluation is performed by the first PSU. ### Claim 14 (depends on 12) The hardware memory device of claim 12, wherein to perform the evaluation, the first PSU determines that a voltage at the first input line drops from a first high-voltage level to a low-voltage level, and then rises from the low-voltage level to a second high-voltage level. ### Claim 15 (depends on 14) The hardware memory device of claim 14, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level, is selected to model at least one of: (a) coupling a power cable to a first power source, wherein the power cable is coupled to the input line, (b) decoupling the power cable from the first power source, and (c) coupling the power cable to a second power source; or (ii) (a) coupling a first power cable to the first input line, wherein the first power cable is coupled to a first power source, (b) decoupling the first power cable from the first input line, and (c) coupling a second power cable to the first input line, wherein the second power cable is coupled to a second power source. ### Claim 16 (depends on 14) The hardware memory device of claim 14, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level, is selected to model a voltage drop at the first input line due to a power failure. ### Claim 17 An Information Handling System (IHS), comprising: a first Power Supply Unit (PSU); a second PSU coupled to the first PSU and configured to provide a secondary bias to the first PSU; and a Baseband Management Controller (BMC) coupled to the first and second PSUs, wherein the BMC is configured to: identify a mismatch between a first line status of a first input line of the first PSU and a second line status of a second input line of the second PSU; disable the first PSU in response to the mismatch; and enable the first PSU in response to an evaluation of the first input line without loss of the secondary bias by the first PSU, wherein to perform the evaluation, the first PSU is configured to determine that: a voltage at an input voltage at the first input line drops from a first high-voltage level to a low-voltage level, and subsequently rises from the low-voltage level to a second high-voltage level. ### Claim 18 (depends on 17) The IHS of claim 17, wherein the mismatch is identified in response to the first PSU having latched to the first input line before the first input line reached a steady state. ### Claim 19 (depends on 17) The IHS of claim 17, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level, is selected to model at least one of: (iii) (a) coupling a power cable to a first power source, wherein the power cable is coupled to the input line, (b) decoupling the power cable from the first power source, and (c) coupling the power cable to a second power source; or (i) (a) coupling a first power cable to the first input line, wherein the first power cable is coupled to a first power source, (b) decoupling the first power cable from the first input line, and (c) coupling a second power cable to the first input line, wherein the second power cable is coupled to a second power source. ### Claim 20 (depends on 17) The IHS of claim 17, wherein at least one of: the first high-voltage level, the low-voltage level, or the second high-voltage level, is selected to model a voltage drop at the first input line due to a mains power failure.