GATE DRIVE CIRCUIT

• Main Authors: UEDA KAZUHIRO, KUZUMAKI ATSUHIKO, TAKIMOTO KAZUYASU, TAI HIROMICHI, MORIKAWA RYUICHI, OBE TOSHIHARU, HIRANO MAKIKO, ITO HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 14.12.2017
• 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; BASIC ELECTRONIC CIRCUITRY; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PULSE TECHNIQUE

PROBLEM TO BE SOLVED: To provide a gate drive circuit suppressing a turn-off loss of a switching element while achieving protection of the switching element.SOLUTION: Each of gate drive circuits 1A-1C according to one embodiment comprises: a gate output terminal connected with a gate of a switching element 3; a pulse generation device 5 that outputs a pulse for controlling gate potential of the switching element 3; a first resistor 6 connected between the pulse generation device 5 and the gate output terminal; a second resistor 7 connected in parallel to the first resistor 6 between the pulse generation device 5 and the gate output terminal; a changeover switch 14 that connects one of the first resistor 6 and the second resistor 7 to the pulse generation device 5; a comparator 12 that compares a signal supplied to an input terminal with a reference voltage Vref and outputs a signal for switching the changeover switch 14; and an inductance 8 whose one end is connected to an emitter of the switching element 3, and whose other end is connected to the input terminal of the comparator 12 via a diode 9 and voltage dividing resistors 10 and 11.SELECTED DRAWING: Figure 1 【課題】 スイッチング素子の保護を図るとともに、スイッチング素子のターンオフ損失を抑制するゲート駆動回路を提供する。【解決手段】 実施形態によるゲート駆動回路１Ａ〜１Ｃは、スイッチング素子３のゲートと接続したゲート出力端子と、スイッチング素子３のゲート電位を制御するパルスを出力するパルス発生装置５と、パルス発生装置５とゲート出力端子との間に接続した第１抵抗器６と、パルス発生装置５とゲート出力端子との間において、第１抵抗器６と並列に接続した第２抵抗器７と、第１抵抗器６と第２抵抗器７との一方をパルス発生装置５と接続する切替スイッチ１４と、入力端子に供給された信号と参照電圧Ｖｒｅｆとを比較して切替スイッチ１４を切替える信号を出力するコンパレータ１２と、一端がスイッチング素子３のエミッタと接続し、他端がダイオード９と分圧抵抗器１０、１１とを介してコンパレータ１２の入力端子と接続したインダクタンス８と、を備える。【選択図】図１