POWER-FACTOR IMPROVEMENT CIRCUIT, AND SWITCHING POWER-SUPPLY DEVICE USING THE SAME

• Main Author: SUGIMOTO MASATOSHI
• Format: Patent
• Language: English; Japanese
• Published: 04.04.2019
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

To provide a power-factor improvement circuit capable of properly maintaining a loop gain while maintaining current detection accuracy even when inputting a different AC input voltage, and to provide a switching power-supply device using the same.SOLUTION: There are provided an input voltage detection terminal tat which a voltage according to an input voltage of a boost chopper 11 is input, a current detection terminal tat which a voltage according to an inductor current of the boost chopper is input, an output voltage detection terminal tat which a voltage according to an output voltage of the boost chopper is input, a power-factor improvement circuit 14 provided with an output terminal at which a driving signal is output to a switching element, and a voltage adjustment circuit 19 for adjusting a current detection terminal voltage and an input voltage detection terminal voltage according to a detected input voltage by detecting the input voltage.SELECTED DRAWING: Figure 1 【課題】異なる交流入力電圧が入力された場合でも電流検出精度を維持しながらループゲインを適正に維持することができる力率改善回路及びこれを使用したスイッチング電源装置を提供する。【解決手段】昇圧チョッパ１１の入力電圧に応じた電圧が入力される入力電圧検出端子ｔＶＤＥＴと、昇圧チョッパのインダクタ電流に応じた電圧が入力される電流検出端子ｔＩＳと、昇圧チョッパの出力電圧に応じた電圧が入力される出力電圧検出端子ｔＦＢと、スイッチング素子に対する駆動信号を出力する出力端子とを備える力率改善制御回路１４と、入力電圧を検出し、検出した入力電圧に応じて電流検出端子の電圧及び入力電圧検出端子の電圧を調整する電圧調整回路１９とを備えている。【選択図】図１