# US 10,122,290 B2 · Switched energy resonant power supply system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,290 B2 - Document ID: US10122290B2 - Status: Granted - Kind: B2 - Application number: 15/377,860 - Filed: 2016-12-13 - Published: 2017-06-15 - Granted: 2018-11-06 - Earliest claimed: 2015-12-14 - Applicants: James F. Murray - Inventors: James F. Murray - Web page: https://patentgrep.com/patent/US10122290B2 ## CPC - H02J 3/381: {Dispersed generators} - H02M 5/297: for conversion of frequency - H02J 2101/24: Photovoltaics - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 5/293: using semiconductor devices only - H02M 7/155: using semiconductor devices only - H02M 7/162: in a bridge configuration - H02M 7/217: using semiconductor devices only - H02M 7/219: in a bridge configuration - H02M 7/2195: {the switches being synchronously commutated at the same frequency of the AC input voltage} - H02P 9/14: by variation of field (H02P9/08, H02P9/10 take precedence) - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - 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) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Apparatus and associated methods relate to a switching network that (1) receives energy from an input source that magnetically excites an output winding, (2) stores some of that energy in a series capacitance while delivering power to a resistive load during a first excitation cycle portion, and (3) then injects some of the stored energy back to the input source by injecting current into a tap of the output winding while delivering power to the resistive load and during a second excitation cycle portion. In an illustrative example, the first excitation cycle portion may include a first positive or negative quarter cycle of the excitation waveform. The second excitation cycle portion may include a second positive or negative quarter cycle of the excitation waveform. The energy injected back to the input source during the second excitation cycle portion may advantageously provide, for example, an assisting torque to a prime mover. ## Claims ### Claim 1 A method comprising: providing a magnetic flux path to couple energy between an input source and an output winding; providing a charging terminal and a return terminal at opposite ends of the output winding, and an injection terminal at a tap between the charging terminal and the return terminal; exciting the magnetic flux path with a periodic flux waveform alternately having a positive half-cycle and a negative half-cycle, wherein the positive half-cycle is formed of temporally adjacent first and second quarter cycles, and the negative half-cycle is formed of temporally adjacent third and fourth quarter cycles; during the first quarter cycle, providing a positive charging current path from the charging terminal to the return terminal through a series capacitance and a resistive load to transfer energy from the flux waveform to the resistive load; interrupting the charging current path at a predetermined point in the positive half-cycle; during the second quarter cycle, providing a positive injection current path from the return terminal to the injection terminal through the series capacitance and the resistive load to transfer energy to the input source while simultaneously dissipating energy in the resistive load; during the third quarter cycle, providing a negative charging current path from the return terminal to the charging terminal through the series capacitance and the resistive load to transfer energy from the flux waveform to the resistive load; interrupting the negative charging current path at a predetermined point in the negative half-cycle; and, during the fourth quarter cycle, providing a negative injection current path from the charging terminal to the injection terminal through the series capacitance and the resistive load to transfer energy to the input source while simultaneously dissipating energy in the resistive load. ### Claim 2 (depends on 1) The method of claim 1, wherein the input source comprises a primary winding of a transformer and the output winding comprises a secondary winding of the transformer. ### Claim 3 (depends on 2) The method of claim 2, wherein the primary winding has a first number of turns Np and the secondary winding has a second number of turns Ns, and the number of turns between the injection tap and the return terminal has k*Ns turns, where k<1. ### Claim 4 (depends on 3) The method of claim 3, wherein during the first quarter cycle, energy input to the primary winding couples to the secondary winding with an effective primary-to-secondary turns ratio of Np:Ns, and during the second quarter cycle, energy input to the secondary winding at the injection terminal couples to the primary winding with an effective primary-to-secondary turns ratio of Np:k*Ns. ### Claim 5 (depends on 1) The method of claim 1, wherein the tap is located at an electrically symmetric center-point between the charging terminal and the return terminal. ### Claim 6 (depends on 1) The method of claim 1, wherein the tap couples to the output winding at a point between about twenty to fifty percent of the electrical distance between the charging terminal and the return terminal. ### Claim 7 (depends on 1) The method of claim 1, wherein the tap couples to the output winding at a point between about fifty to eighty percent of the electrical distance between the charging terminal and the return terminal. ### Claim 8 (depends on 1) The method of claim 1, wherein the input source comprises a rotating magnetic field source. ### Claim 9 (depends on 8) The method of claim 8, further comprising a prime mover operably coupled to rotate the magnetic field source, wherein during the second and fourth quarter cycles, the transfer of energy to the input source comprises an assisting torque to the prime mover. ### Claim 10 (depends on 9) The method of claim 9, wherein the prime mover comprises a combustion engine. ### Claim 11 (depends on 9) The method of claim 9, wherein the prime mover comprises an electric motor. ### Claim 12 A method comprising: providing a magnetic flux path to couple energy between an input source and an output winding; providing a charging terminal and a return terminal at opposite ends of the output winding, and an injection terminal at a tap between the charging terminal and the return terminal; exciting the magnetic flux path with a periodic flux waveform having a positive half-cycle the positive half-cycle formed from temporally adjacent first and second quarter cycles; during the first quarter cycle, providing a charging current path from the charging terminal to the return terminal through a series capacitance and a resistive load to transfer energy from the flux waveform to the resistive load; interrupting the charging current path at a predetermined point in the positive half-cycle; and, during the second quarter cycle, providing an injection current path from the return terminal to the injection terminal through the series capacitance and the resistive load to transfer energy to the input source while simultaneously dissipating energy in the resistive load. ### Claim 13 (depends on 12) The method of claim 12, wherein the input source comprises a primary winding of a transformer and the output winding comprises a secondary winding of the transformer. ### Claim 14 (depends on 13) The method of claim 13, wherein the primary winding has a first number of turns Np and the secondary winding has a second number of turns Ns, and the number of turns between the injection tap and the return terminal has k*Ns turns, where k<1. ### Claim 15 (depends on 14) The method of claim 14, wherein during the first quarter cycle, energy input to the primary winding couples to the secondary winding with an effective primary-to-secondary turns ratio of Np:Ns, and during the second quarter cycle, energy input to the secondary winding at the injection terminal couples to the primary winding with an effective primary-to-secondary turns ratio of Np:k*Ns. ### Claim 16 (depends on 12) The method of claim 12, wherein the input source comprises a rotating magnetic field source. ### Claim 17 (depends on 16) The method of claim 16, further comprising a prime mover operably coupled to rotate the magnetic field source. ### Claim 18 (depends on 17) The method of claim 17, wherein during the second quarter cycle, the transfer of energy to the input source comprises an assisting torque to the prime mover. ### Claim 19 An apparatus comprising: a magnetic flux path to couple energy between an input source and an output winding; a charging terminal and a return terminal at opposite ends of the output winding, and an injection terminal at a tap between the charging terminal and the return terminal; an electronically controllable charging switch that, in a conducting state, electrically connects an output node to the charging terminal, and in a non-conducting state, electrically disconnects the charging terminal from the output node; an electronically controllable injection switch that, in a conducting state, electrically connects the output node to the injection terminal, and in a non-conducting state, electrically disconnects the injection terminal from the output node; a controller operatively connected to control the conducting state of the charging switch, and further operatively connected to control the conducting state of the injection switch; a data store operably coupled to the controller, wherein the data store contains a program of instructions that, when executed by the controller, cause the controller to perform operations to control the charging switch and the injection switch to direct current via the output node through a series capacitance and a resistive load in response to excitation of the magnetic flux path with a periodic flux waveform having a positive half-cycle formed of temporally adjacent first and second quarter cycles, the operations comprising: controlling, during the first quarter cycle, the charging switch to the conducting state and the injection switch to the non-conducting state to form a charging current path from the charging terminal to the return terminal through the series capacitance and the resistive load to transfer energy from the flux waveform to the resistive load; interrupt the charging current path at a predetermined point in the positive half-cycle; and, controlling, during the second quarter cycle, the charging switch to the non-conducting state and the injection switch to the conducting state to form a positive injection current path from the return terminal to the injection terminal through the series capacitance and the resistive load to transfer energy to the input source while simultaneously dissipating energy in the resistive load. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the input source comprises a rotating magnetic field source, the apparatus further comprising a prime mover operably coupled to rotate the magnetic field source, wherein during the second quarter cycle, the transfer of energy to the input source comprises an assisting torque to the prime mover.