IMAGE FORMING APPARATUS

• Main Authors: OKADA NORIKAZU, SANJO MAKOTO, SHIDA HARUO
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2023
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CINEMATOGRAPHY; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRICITY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; GENERATION; HOLOGRAPHY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MAGNETOGRAPHY; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

To prevent destruction of an electrolytic capacitor and restrict the height of the electrolytic capacitor.SOLUTION: An image forming apparatus comprises: a rectification circuit that rectifies a current supplied from a commercial power supply; a smoothing circuit that smooths a current output from the rectification circuit; and a determination unit that determines whether a voltage supplied from the commercial power supply is an overvoltage exceeding a threshold. The smoothing circuit has two electrolytic capacitors, and a switching unit being a switch that switches the electrolytic capacitor to be used according to output from the determination unit. The determination unit has a voltage detection circuit that detects a voltage value being the value of the voltage supplied from the commercial power supply, and a control circuit for switching that outputs a switching control signal for the switching unit based on the voltage value from the voltage detection circuit.SELECTED DRAWING: Figure 3 【課題】電解コンデンサの破壊を防止し、かつ電解コンデンサの高さを制限する。【解決手段】画像形成装置は、商用電源からの供給電流を整流する整流回路と、整流回路からの出力電流を平滑化する平滑回路と、商用電源からの供給電圧が閾値を超える過電圧であるか否かを判定する判定部と、を備える。平滑回路は、２つの電解コンデンサと、判定部の出力に従って、使用する電解コンデンサを切り替えるスイッチである切り替え部と、を有する。判定部は、商用電源からの供給電圧の値である電圧値を検知する電圧検知回路と、電圧検知回路からの電圧値を基に、切り替え部の切り替え制御信号を出力する切り替え用制御回路と、を有する。【選択図】図３