# US 11,309,796 B2 · Control method of single live line charging circuit, control circuit of single live line charging circuit and single live line charging circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,796 B2 - Document ID: US11309796B2 - Status: Granted - Kind: B2 - Application number: 16/847,692 - Filed: 2020-04-14 - Published: 2020-10-22 - Granted: 2022-04-19 - Earliest claimed: 2019-04-16 - Assignees: Joulwatt Technology (Hangzhou) Co., Ltd. - Applicants: Joulwatt Technology (Hangzhou) Co.,LTD. - Inventors: Hao Long; Xunwei Zhou - Web page: https://patentgrep.com/patent/US11309796B2 ## CPC - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 7/217: using semiconductor devices only - H05B 45/375: using buck topology - H02J 7/90: Regulation of charging or discharging current or voltage - H02M 3/1582: {Buck-boost converters (H02M3/1584 takes precedence)} - H05B 47/105: in response to determined parameters - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - 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) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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 ## Abstract A control method of a single live line charging circuit, a control circuit of a single live line charging circuit, and a single live line charging circuit are provided. The single live line charging circuit includes a first switch, a first conduction element, a first inductor, a second switch, a second conduction element, a third switch, a first input end and a second input end; the first input end is connected to a first end of the first switch through the second conduction element; the first switch, the first conduction element and the first inductor constitute a buck circuit; the first input end is connected to a reference ground through the second switch, the second input end is connected to the reference ground through the third switch, and an alternating current input is connected to the first input end through a load circuit. ## Claims ### Claim 1 A control method of a single live line charging circuit, wherein the single live line charging circuit comprises a first switch, a first conduction element, a first inductor, a second switch, a second conduction element, a third switch, a first input end and a second input end; the first input end is connected to a first end of the first switch through the second conduction element; the first switch, the first conduction element and the first inductor constitute a buck circuit; the first input end is connected to a reference ground through the second switch, the second input end is connected to the reference ground through the third switch, and an alternating current input is connected to the first input end through a load circuit; wherein when the load circuit is turned off, the first switch, the first conduction element and the first inductor work in a buck mode, and both the second switch and the third switch are turned off; when the load circuit is turned on, an output end of the single live line charging circuit is in a charging state when a voltage of the output end of the single live line charging circuit relative to the reference ground is lower than a first voltage threshold, the output end of the single live line charging circuit is in a non-charging state when the voltage of the output end of the single live line charging circuit rises to a second voltage threshold, and the output end of the single live line charging circuit returns to the charging state when the voltage of the output end of the single live line charging circuit decreases to the first voltage threshold; wherein the second voltage threshold is greater than the first voltage threshold; and the first conduction element and the second conduction element are diodes or switches. ### Claim 2 (depends on 1) The control method of the single live line charging circuit of claim 1, wherein, in the charging state, when a voltage of the first input end is greater than a voltage of the second input end, the second switch is turned off, the third switch is turned off or completely turned on, or a drain voltage of the third switch is made to approach a third voltage by controlling a control electrode voltage of the third switch; when the voltage of the first input end is less than the voltage of the second input end, the third switch is completely turned on, the second switch is turned off or completely turned on, or a drain voltage of the second switch is made to approach a second voltage by controlling a control electrode voltage of the second switch; in the non-charging state, both the second switch and the third switch are turned on. ### Claim 3 (depends on 2) The control method of the single live line charging circuit of claim 2, wherein, in the charging state, when an input current is less than a first current threshold, the input current charges the output end of the single live line charging circuit. ### Claim 4 (depends on 1) The control method of the single live line charging circuit of claim 1, wherein, the single live line charging circuit further comprises a third conduction element, and the second input end is connected to the first end of the first switch through the third conduction element. ### Claim 5 (depends on 4) The control method of the single live line charging circuit of claim 4, wherein, in the charging state, when a voltage of the first input end is greater than a voltage of the second input end, the second switch is turned off, the third switch is turned off or completely turned on, or a drain voltage of the third switch is made to approach a third voltage by controlling a control electrode voltage of the third switch; when the voltage of the first input end is less than the voltage of the second input end, the third switch is turned off, the second switch is turned off or completely turned on, or a drain voltage of the second switch is made to approach a second voltage by controlling a control electrode voltage of the second switch; in the non-charging state, both the second switch and the third switch are turned on. ### Claim 6 (depends on 5) The control method of the single live line charging circuit of claim 5, wherein, in the charging state, when an input current is less than a first current threshold, the input current charges the output end of the single live line charging circuit. ### Claim 7 (depends on 4) The control method of the single live line charging circuit of claim 4, wherein, in the charging state, when an input current is less than a first current threshold, the input current charges the output end of the single live line charging circuit. ### Claim 8 (depends on 1) The control method of the single live line charging circuit of claim 1, wherein, in the charging state, when an input current is less than a first current threshold, the input current charges the output end of the single live line charging circuit. ### Claim 9 (depends on 8) The control method of the single live line charging circuit of claim 8, wherein, in the charging state, when a current of the first switch is greater than the first current threshold, the first switch is turned off, the second switch and the third switch are turned on. ### Claim 10 (depends on 1) A single live line charging circuit, using the control method of claim 1. ### Claim 11 (depends on 10) The single live line charging circuit of claim 10, wherein, in the charging state, when a voltage of the first input end is greater than a voltage of the second input end, the second switch is turned off, the third switch is turned off or completely turned on, or a drain voltage of the third switch is made to approach a third voltage by controlling a control electrode voltage of the third switch; when the voltage of the first input end is less than the voltage of the second input end, the third switch is completely turned on, the second switch is turned off or completely turned on, or a drain voltage of the second switch is made to approach a second voltage by controlling a control electrode voltage of the second switch; in the non-charging state, both the second switch and the third switch are turned on. ### Claim 12 (depends on 10) The single live line charging circuit of claim 10, wherein, the single live line charging circuit further comprises a third conduction element, and the second input end is connected to the first end of the first switch through the third conduction element. ### Claim 13 (depends on 12) The single live line charging circuit of claim 12, wherein, in the charging state, when a voltage of the first input end is greater than a voltage of the second input end, the second switch is turned off, the third switch is turned off or completely turned on, or a drain voltage of the third switch is made to approach a third voltage by controlling a control electrode voltage of the third switch; when the voltage of the first input end is less than the voltage of the second input end, the third switch is turned off, the second switch is turned off or completely turned on, or a drain voltage of the second switch is made to approach a second voltage by controlling a control electrode voltage of the second switch; in the non-charging state, both the second switch and the third switch are turned on. ### Claim 14 (depends on 10) The single live line charging circuit of claim 10, wherein, in the charging state, when an input current is less than a first current threshold, the input current charges the output end of the single live line charging circuit. ### Claim 15 (depends on 14) The single live line charging circuit of claim 14, wherein, in the charging state, when a current of the first switch is greater than the first current threshold, the first switch is turned off, the second switch and the third switch are turned on. ### Claim 16 A control circuit of a single live line charging circuit, wherein the single live line charging circuit comprises a first switch, a first conduction element, a first inductor, a second switch, a second conduction element, a third switch, a first input end and a second input end; the first input end is connected to a first end of the first switch through the second conduction element; the first switch, the first conduction element and the first inductor constitute a buck circuit; the first input end is connected to a reference ground through the second switch, the second input end is connected to the reference ground through the third switch, and an alternating current input is connected to the first input end through a load circuit; wherein when the control circuit receives a first signal, the control circuit controls the first switch, the first conduction element and the first inductor to work in a buck mode, and the control circuit controls both the second switch and the third switch to be turned off, wherein the first signal indicates a turn-off of the load circuit; when the control circuit receives a second signal, the control circuit controls an output end of the single live line charging circuit to be in a charging state when a voltage of the output end of the single live line charging circuit relative to the reference ground is lower than a first voltage threshold, the control circuit controls the output end of the single live line charging circuit to be in a non-charging state when the voltage of the output end of the single live line charging circuit rises to a second voltage threshold, and the output end of the single live line charging circuit returns to the charging state when the voltage of the output end of the single live line charging circuit decreases to the first voltage threshold, wherein the second signal indicates a turn-on of the load circuit; and the second voltage threshold is greater than the first voltage threshold; the first conduction element and the second conduction element are diodes or switches. ### Claim 17 (depends on 16) The control circuit of the single live line charging circuit of claim 16, wherein, the control circuit detects a voltage of the first input end and a voltage of the second input end; in the charging state, when the voltage of the first input end is greater than the voltage of the second input end, the control circuit controls the second switch to be turned off, controls the third switch to be turned off or completely turned on, or controls a control electrode voltage of the third switch to make a drain voltage of the third switch approach a third voltage; when the voltage of the first input end is less than the voltage of the second input end, the control circuit controls the third switch to be completely turned on, controls the second switch to be turned off or completely turned on, or controls a control electrode voltage of the second switch to make a drain voltage of the second switch approach a second voltage; in the non-charging state, the control circuit controls both the second switch and the third switch to be turned on. ### Claim 18 (depends on 16) The control circuit of the single live line charging circuit of claim 16, wherein, the single live line charging circuit further comprises a third conduction element, and the second input end is connected to the first end of the first switch through the third conduction element. ### Claim 19 (depends on 16) The control circuit of the single live line charging circuit of claim 16, wherein, the single live line charging circuit further comprises a microprocessor, and the microprocessor receives a signal that the load circuit is turned on or off, converts the signal into a signal indicating a turn-on or a turn-off of the load circuit, and sends the signal indicating the turn-on or the turn-off of the load circuit to the control circuit.