# US 10,466,730 B2 · Transient suppression with lossless steady state operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,466,730 B2 - Document ID: US10466730B2 - Status: Granted - Kind: B2 - Application number: 15/363,108 - Filed: 2016-11-29 - Published: 2017-03-16 - Granted: 2019-11-05 - Earliest claimed: 2013-03-13 - Assignees: Quantance, Inc. - Applicants: Quantance, Inc. - Inventors: Vikas Vinayak; Serge Francois Drogi - Web page: https://patentgrep.com/patent/US10466730B2 ## CPC - G05F 3/08: wherein the variable is DC - G05F 1/613: using semiconductor devices in parallel with the load as final control devices (G05F1/461 takes precedence) - H02J 3/28: Arrangements for balancing of the load in networks by storage of energy - H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)} - G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A power supply efficiently suppresses transient voltages by storing the maximum charge expected in the transient and releasing it during the transient event at a rate in an equal but opposite amount to the transient, preventing the battery voltage from collapsing. The described power supply provides improved efficiency compared to conventional architectures for transient suppression, thus increasing the length of time between battery charges and creating a better user experience. ## Claims ### Claim 1 A transient suppression circuit, comprising: a power supply terminal configured to couple to a voltage source and to an electronic device to provide power to the electronic device; an operational amplifier having a positive input, a negative input, a bias supply input, and an output, the output of the operational amplifier being coupled to the power supply terminal to provide an output current during a transient load condition; a bias capacitor, coupled to the bias supply input of the operational amplifier, to discharge and provide a bias current to the operational amplifier during the transient load condition; and an output capacitor coupled between the output of the operational amplifier and the power supply terminal to provide a discharge current to the electronic device during the transient load condition to prevent the power supply terminal from dropping below a threshold voltage. ### Claim 2 (depends on 1) The transient suppression circuit of claim 1 wherein the bias capacitor and output capacitor are configured to collectively store an amount of charge during the nominal load condition based on an expected maximum drop in a voltage at the power supply terminal during the transient load condition and an expected maximum duration of the transient load condition. ### Claim 3 (depends on 1) The transient suppression circuit of claim 1 further comprising an operational amplifier input circuit to provide a first voltage to the positive input terminal of the operational amplifier and to provide a second voltage to the negative input terminal of the operational amplifier, the second voltage being greater than the first voltage during a nominal load condition and the second voltage dropping below the first voltage in response to the transient load condition to cause the operational amplifier to provide the output current during the transient load condition. ### Claim 4 (depends on 3) The transient suppression circuit of claim 3 wherein the operational amplifier input circuit includes; a first RC circuit having a first time constant, the first RC circuit being coupled to the power supply terminal, and the first RC circuit to provide the first voltage to the positive input terminal of the operational amplifier; and a second RC circuit having a second time constant, the second RC circuit being coupled to the power supply terminal, and the second RC circuit to provide the second voltage to the negative input terminal of the operational amplifier. ### Claim 5 (depends on 1) The transient suppression circuit of claim 1 further comprising a switch to couple the power supply terminal to the bias supply input of the operational amplifier during the nominal load condition and to decouple the power supply terminal from the bias supply input during the transient load condition. ### Claim 6 (depends on 1) The transient suppression circuit of claim 1 further comprising a resistor coupled between the power supply terminal and the bias supply input of the operational amplifier. ### Claim 7 A transient suppression circuit, comprising: a power supply terminal configured to couple to a voltage source and to an electronic device to provide power to the electronic device; an operational amplifier having an output coupled to the power supply terminal to provide an output current during a transient load condition; a bias capacitor, coupled to a bias input of the operational amplifier, to discharge and provide a bias current to the operational amplifier during the transient load condition; and a current limiting element, coupled between the power supply terminal and the bias input of the operational amplifier, to limit an amount of current flowing from the power supply terminal to at least one of the bias input of the operational amplifier and the bias capacitor during the transient load condition. ### Claim 8 (depends on 7) The transient suppression circuit of claim 7 further comprising an output capacitor coupled between the output of the operational amplifier and the power supply terminal to provide a discharge current to the electronic device during the transient load condition to prevent the power supply terminal from dropping below a threshold voltage. ### Claim 9 (depends on 8) The transient suppression circuit of claim 8 wherein the bias capacitor and output capacitor are configured to collectively store an amount of charge during the nominal load condition based on an expected maximum drop in a voltage at the power supply terminal during the transient load condition and an expected maximum duration of the transient load condition. ### Claim 10 (depends on 7) The transient suppression circuit of claim 7 further comprising an operational amplifier input circuit to provide a first voltage to a positive input terminal of the operational amplifier and to provide a second voltage to a negative input terminal of the operational amplifier, the second voltage being greater than the first voltage during a nominal load condition and the second voltage dropping below the first voltage in response to the transient load condition to cause the operational amplifier to provide the output current during the transient load condition. ### Claim 11 (depends on 10) The transient suppression circuit of claim 10 wherein the operational amplifier input circuit includes; a first RC circuit having a first time constant, the first RC circuit being coupled to the power supply terminal, and the first RC circuit to provide the first voltage to the positive terminal of the operational amplifier; and a second RC circuit having a second time constant, the second RC circuit being coupled to the power supply terminal, and the second RC circuit to provide the second voltage to the negative terminal of the operational amplifier. ### Claim 12 (depends on 7) The transient suppression circuit of claim 7 wherein the current limiting element is a switch. ### Claim 13 (depends on 7) The transient suppression circuit of claim 7 wherein the current limiting element is a resistor. ### Claim 14 A transient suppression circuit for providing power to an electronic device, comprising: a power supply terminal configured to couple to a voltage source and to the electronic device to provide power to the electronic device; an operational amplifier having a positive input, a negative input, a bias supply input, and an output, configured to receive a differential input voltage and produce an output current responsive to the differential input voltage being positive; an operational amplifier input circuit to provide the differential input voltage to the operational amplifier, the differential input voltage being positive during a transient load condition, and the differential input voltage being negative during a nominal load condition; a bias capacitor coupled to the bias supply input of the operational amplifier to supply provide a bias current to the bias supply input of the operational amplifier during the transient load condition to enable the operational amplifier to supply the output current; and an output capacitor coupled between the output of the operational amplifier and the power supply terminal to supply a discharge current to the electronic device in response to the output current produced by the operational amplifier during the transient load condition, the discharge current sufficient to prevent the power supply terminal from dropping below a threshold voltage. ### Claim 15 (depends on 14) The transient suppression circuit of claim 14 wherein the bias capacitor and output capacitor are configured to collectively store an amount of charge during the nominal load condition based on an expected maximum drop in a voltage at the power supply terminal during the transient load condition and an expected maximum duration of the transient load condition. ### Claim 16 (depends on 14) The transient suppression circuit of claim 14 wherein the operational amplifier input circuit provides the differential input voltage to the operational amplifier by providing a first voltage to the positive input terminal of the operational amplifier and providing a second voltage to the negative input terminal of the operational amplifier, the second voltage being greater than the first voltage during a nominal load condition and the second voltage dropping below the first voltage in response to the transient load condition. ### Claim 17 (depends on 14) The transient suppression circuit of claim 14 further comprising a switch to couple the power supply terminal to the bias supply input of the operational amplifier during the nominal load condition and to decouple the power supply terminal from the bias supply input during the transient load condition. ### Claim 18 (depends on 14) The transient suppression circuit of claim 14 further comprising a resistor coupled between the power supply terminal and the bias supply input of the operational amplifier.