# US 7,612,531 B2 · Deep discharge battery dynamic charging system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,612,531 B2 - Document ID: US7612531B2 - Status: Granted - Kind: B2 - Application number: 11/700,098 - Filed: 2007-01-31 - Published: 2008-07-31 - Granted: 2009-11-03 - Earliest claimed: 2007-01-31 - Assignees: SPX Corporation - Inventors: Surender Makhija; Kurt Raichle - Web page: https://patentgrep.com/patent/US7612531B2 ## CPC - H02J 7/875: {Charging or discharging for charge maintenance, battery initiation or rejuvenation} - H02J 7/04: Regulation of charging current or voltage - H02J 7/90: Regulation of charging or discharging current or voltage - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A system and method of dynamically charging a lead-acid battery that has been in a deep discharged state for an extended period of time or is deeply sulfated includes an alternating current (AC) line input connected to a transformer. The output of the transformer is connected to a pair of silicon-controlled rectifiers (SCRs). The SCRs are in turn connected to terminals of a lead-acid battery. A pair of signal diodes is used to obtain waveform information for the AC input for phase control to trigger the SCRs. The outputs of the signal diodes and the SCRs are connected to a phase regulated output controller. A turn-on time for the SCRs is delayed to create a differential voltage between the transformer output and a voltage of the battery. The differential voltage is applied to terminals of the battery at an increased frequency rate to break battery sulfation. ## Claims ### Claim 1 A system for dynamically charging a battery, comprising: a transformer; a node connected to an output of the transformer; a waveform sensor having an input connected to the node; at least one rectifier having an input connected to the node; and a phase-regulated output controller connected to the waveform sensor and a gate input of the at least one rectifier. ### Claim 2 (depends on 1) The system of claim 1, further comprising a plurality of rectifiers. ### Claim 3 (depends on 1) The system of claim 1, wherein the waveform sensor comprises at least one diode. ### Claim 4 (depends on 3) The system of claim 3, wherein the at least one diode comprises a signal diode. ### Claim 5 (depends on 1) The system of claim 1, wherein the at least one rectifier comprises a silicon-controlled rectifier. ### Claim 6 (depends on 1) The system of claim 1, further comprising an alternating current line input. ### Claim 7 (depends on 1) The system of claim 1, further comprising at least one terminal of a battery connected to the output of the at least one rectifier. ### Claim 8 (depends on 7) The system of claim 7, wherein battery is a lead-acid battery. ### Claim 9 A method of dynamically charging a battery, comprising: receiving a sinusoidal voltage; applying the sinusoidal voltage through a node directly to at least one rectifier and directly to at least one waveform sensor; obtaining waveform information for the sinusoidal voltage; delaying a turn-on time for the at least one rectifier for a predetermined period of time based on the waveform information; triggering the at least one rectifier after the predetermined period of time has expired; and applying a differential voltage to at least one terminal of a battery. ### Claim 10 (depends on 9) The method of claim 9, further comprising repeating the receiving, obtaining, delaying, triggering, and applying. ### Claim 11 (depends on 10) The method of claim 10, wherein the repeating is performed at a rate that is greater than a frequency of a line voltage. ### Claim 12 (depends on 11) The method of claim 11, wherein the rate is at least twice the frequency of the line voltage. ### Claim 13 (depends on 9) The method of claim 9, further comprising determining a time delay for the predetermined period of time. ### Claim 14 (depends on 9) The method of claim 9, wherein the triggering uses a phase-regulated output controller. ### Claim 15 (depends on 9) The method of claim 9, wherein the at least one rectifier comprises a silicon-controlled rectifier. ### Claim 16 (depends on 9) The method of claim 9, wherein the obtaining the waveform information uses at least one signal diode. ### Claim 17 (depends on 9) The method of claim 9, wherein the sinusoidal voltage is output from a transformer. ### Claim 18 (depends on 17) The method of claim 17, wherein an output of the transformer is applied to the at least one rectifier through the node. ### Claim 19 (depends on 9) The method of claim 9, wherein the battery comprises a lead-acid battery. ### Claim 20 A system of dynamically charging a battery, comprising: means for receiving a sinusoidal voltage; means for obtaining waveform information for the sinusoidal voltage; means for delaying a turn-on time of at least one rectifier for a predetermined period of time based on the waveform information; means for triggering the at least one rectifier after the predetermined period of time has expired; means for applying a differential voltage to at least one terminal of the battery; and means for connecting to an output of the means for receiving a sinusoidal voltage, an input of the means for obtaining waveform information, and an input of the at least on rectifier. ### Claim 21 (depends on 20) The system of claim 20, further comprising a plurality of rectifiers. ### Claim 22 (depends on 20) The system of claim 20, wherein the means for obtaining waveform information comprises at least one diode. ### Claim 23 (depends on 22) The system of claim 22, wherein the at least one diode comprises a signal diode. ### Claim 24 (depends on 23) The system of claim 23, wherein the at least one rectifier comprises a silicon-controlled rectifier. ### Claim 25 (depends on 24) The system of claim 24, wherein the at least one rectifier is directly connected to the output of the means for receiving a sinusoidal voltage. ### Claim 26 (depends on 20) The system of claim 20, further comprising at least one terminal of the battery connected to an output of the at least one rectifier. ### Claim 27 (depends on 26) The system of claim 26, wherein the battery is a lead-acid battery.