POWER CONVERTER

• Main Authors: TAKAHARA MOTOKI, NISHIO NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 05.07.2018
• 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

PROBLEM TO BE SOLVED: To obtain a power converter having high conversion efficiency regardless of characteristic variations in a switching element of an inverter circuit.SOLUTION: A power converter (20) for converting DC power from an external power source to supply AC power, includes: a conversion efficiency calculation unit (13) for calculating conversion efficiency (η) on the basis of an inverter circuit (1) having a booster circuit (7), a smoothing capacitor (8), switches (9a, 9b), and switching elements (2a, 2b, 2c, 2d), an input voltage (V), an input current (I), an output voltage (V), and an output current (I); a drain voltage measurement unit (14) for measuring and acquiring a drain voltage of the switching elements (2a, 2b, 2c, 2d); and a gate voltage generation unit (19) for generating a gate voltage of the switching elements (2a, 2b, 2c, 2d) using the conversion efficiency (η) and the drain voltage.SELECTED DRAWING: Figure 1 【課題】インバータ回路のスイッチング素子の特性ばらつきに関わらず、変換効率の高い電力変換装置を得ること。【解決手段】外部電源からの直流電力を変換して交流電力を供給する電力変換装置（２０）が、昇圧回路（７）と、平滑コンデンサ（８）と、スイッチ（９ａ，９ｂ）と、スイッチング素子（２ａ，２ｂ，２ｃ，２ｄ）を有するインバータ回路（１）と、入力電圧（Ｖｉ）及び入力電流（Ｉｉ）と出力電圧（Ｖｏ）及び出力電流（Ｉｏ）とに基づいて変換効率（η）を算出する変換効率算出部（１３）と、スイッチング素子（２ａ，２ｂ，２ｃ，２ｄ）のドレイン電圧を計測して取得するドレイン電圧計測部（１４）と、変換効率（η）とドレイン電圧とを用いてスイッチング素子（２ａ，２ｂ，２ｃ，２ｄ）のゲート電圧を生成するゲート電圧生成部（１９）とを備える。【選択図】図１