# US 2015/0311805 A1 · Power supply device, image forming apparatus, laser device, laser ignition device, and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0311805 A1 - Document ID: US20150311805A1 - Status: Published application - Kind: A1 - Application number: 14/688,047 - Filed: 2015-04-16 - Published: 2015-10-29 - Earliest claimed: 2014-04-24 - Assignees: Ricoh Company, Ltd. - Inventors: Tomofumi YAMASHITA - Web page: https://patentgrep.com/patent/US20150311805A1 ## CPC - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - G03G 15/5004: {Power supply control, e.g. power-saving mode, automatic power turn-off} - G03G 15/80: {Details relating to power supplies, circuits boards, electrical connections} - H02M 1/34: Snubber circuits - H02M 3/33546: {with automatic control of the output voltage or current (H02M3/33561 takes precedence)} - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 1/346: {Passive non-dissipative snubbers} - 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 - 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) - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A power supply device includes a power converter transformer, a coil, a first capacitor, and an energy regeneration circuit. The power converter transformer includes a primary winding and a secondary winding. The coil is provided on a primary side of the power converter transformer, and has a first end connected in series to a first end of the primary winding of the power converter transformer to store energy. The stored energy is regenerated in the first capacitor provided on the primary side of the power converter transformer by the energy regeneration circuit provided on the primary side of the power converter transformer. ## Claims ### Claim 1 A power supply device comprising: a power converter transformer including a primary winding and a secondary winding; a coil provided on a primary side of the power converter transformer, and having a first end connected in series to a first end of the primary winding of the power converter transformer to store energy; a first capacitor provided on the primary side of the power converter transformer, and in which the stored energy is regenerated; and an energy regeneration circuit provided on the primary side of the power converter transformer to regenerate the stored energy in the first capacitor. ### Claim 2 (depends on 1) The power supply device according to claim 1, wherein the energy regeneration circuit includes a first electronic switch connected to a second end of the coil opposed to the first end of the coil and a second electronic switch connected to a second end of the primary winding opposed to the first end of the primary winding. ### Claim 3 (depends on 2) The power supply device according to claim 2, further comprising: a second capacitor and a first resistor connected in parallel to the first electronic switch; and a third capacitor and a second resistor connected in parallel to the second electronic switch. ### Claim 4 (depends on 2) The power supply device according to claim 2, wherein the energy regeneration circuit further includes a first diode to store the energy of the coil in the first capacitor and a second diode to clamp a surge voltage. ### Claim 5 (depends on 1) The power supply device according to claim 1, further comprising a synchronous rectifier circuit provided on a secondary side of the power converter transformer, and including Schottky barrier diodes connected in parallel to parasitic diodes of the synchronous rectifier circuit. ### Claim 6 (depends on 5) The power supply device according to claim 5, further comprising a switch circuit to cut off the synchronous rectifier circuit in accordance with a magnitude of a load connected to the secondary side of the power converter transformer. ### Claim 7 (depends on 1) The power supply device according to claim 1, further comprising: a charging unit provided on a secondary side of the power converter transformer, and including a plurality of capacitors connected in parallel; and a charge current control unit to control a charge current to the charging unit. ### Claim 8 (depends on 7) The power supply device according to claim 7, wherein the charge current control unit includes a feedback circuit including a current sensor to detect a current and controlling the charge current to the charging unit based on a detection result obtained from the current sensor. ### Claim 9 (depends on 1) An image forming apparatus comprising: an image forming unit to form an image; a control unit to control the image forming unit; and the power supply device according to claim 1. ### Claim 10 (depends on 7) A laser device comprising: a laser to emit laser beams; and the power supply device according to claim 7 to supply power to the laser to oscillate. ### Claim 11 (depends on 10) A laser ignition device comprising: the laser device according to claim 10; and an optical system to collect the laser beams emitted from the laser device onto an object to ignite the object. ### Claim 12 (depends on 1) An electronic device comprising the power supply device according to claim 1.