JPH0369936U

JPH0369936U -

Info

Publication number: JPH0369936U
Application number: JP12788989U
Authority: JP
Priority date: 1989-11-02
Filing date: 1989-11-02
Publication date: 1991-07-12

Description

[Brief explanation of drawings]

第１図ａは第１の本考案の駆動回路の１実施例
を示す回路図、第１図ｂは第２の本考案のスイツ
チング回路の１実施例を示す回路図、第１図ｃは
第３の本考案の駆動回路の１実施例を示す回路図
、第１図ｄは第４の本考案のスイツチング回路の
１実施例を示す回路図、第２図、第３図は従来の
各駆動回路を示す回路図、第４図は第２の本考案
のスイツチング回路の１実施例を示す回路図、第
５図は第１の本考案の駆動回路の１実施例を用い
たスイツチング回路の回路図、である。符号の説明、９……トランジスタ（ノーマリイ
・オン形ＳＩＴ）、２０……トランジスタ（ＩＧ
ＢＴ）。 FIG. 1a is a circuit diagram showing an embodiment of the driving circuit of the first invention, FIG. 1b is a circuit diagram showing an embodiment of the switching circuit of the second invention, and FIG. 3 is a circuit diagram showing one embodiment of the driving circuit of the present invention, FIG. 1d is a circuit diagram showing an embodiment of the switching circuit of the fourth invention, and FIGS. FIG. 4 is a circuit diagram showing an embodiment of the switching circuit of the second invention, and FIG. 5 is a circuit diagram of a switching circuit using an embodiment of the driving circuit of the first invention. Figure. Explanation of symbols, 9...Transistor (normally on type SIT), 20...Transistor (IG
BT).

Claims

[Claims for Utility Model Registration] (1) There is a first switching means having a self-turn-off function, whose control terminals and main terminals are a control terminal ct1, main terminals mt1a and mt1b,
When the main terminal mt1a of the control terminal ct1 forms a pair for inputting the drive signal, a first current limiting means for limiting the maximum current and a capacitor are connected to the control terminal ct1 and the main terminal mt1.
A first DC power supply, a second switching means, a second current limiting means for limiting the maximum current, and a forward bias direction of the capacitor are connected in series between the main terminal mt1b and the control terminal ct1. A drive circuit characterized by being connected in series with. (2) Claim 1 characterized in that a resistor or constant current means is used for the first or second current limiting means.
The drive circuit described. (3) The main terminal mt1b and the control terminal ct1
Claim 1 characterized in that the first DC power supply, the second switching means, and the third current limiting means for limiting the maximum current are connected in series between the two.
Or the drive circuit according to 2. (4) The drive circuit according to claim 3, wherein a resistor or constant current means is used as the third current limiting means. (5) In the drive circuit according to claim 1, 2, 3 or 4, there is a third switching means having a self-turn-off function, and the control terminal and main terminal thereof are connected to the control terminal ct3, the main terminals mt3a and mt3b. When the control terminal ct3 and the main terminal mt3a form a pair for inputting the drive signal, the first and third switching means are normally off type, and the control terminal ct1 and the main terminal The forward voltage direction between mt1a and the forward voltage direction between the control terminal ct3 and the main terminal mt3a are opposite, the control terminals ct1 and ct3 are connected, the main terminals mt1a and mt3a are connected, and a second DC A switching circuit characterized in that the first and third switching means are connected in series between both output terminals of a power source. (6) There is a fourth switching means having a self-turn-off function, whose control terminals and main terminals are a control terminal ct4, main terminals mt4a and mt4b,
When the control terminal ct4 and the main terminal mt4a form a pair for inputting the drive signal, a third DC power supply, a fifth switching means, and a maximum switching means are connected between the main terminal mt4b and the control terminal ct4. A fourth current limiting means for limiting current is connected in series in a forward bias direction, and between the main terminal mt4b and the main terminal mt4a, the third DC power supply, the fifth switching means, and the fifth switching means limit the maximum current. A drive circuit characterized in that a fifth current limiting means and a coil are connected in series. (7) Claim 6, characterized in that a resistor or constant current means is used for the fourth or fifth current limiting means.
The drive circuit described. (8) The control terminal ct4/the main terminal mt4a
8. The drive circuit according to claim 6, further comprising a current/voltage conversion means for converting current into voltage connected between the two. (9) The drive circuit according to claim 8, wherein a resistor or a constant voltage means is used as the current/voltage conversion means. (10) In the drive circuit according to claim 6, 7, 8 or 9, there is a sixth switching means having a self-turn-off function, and the control terminal and main terminal thereof are connected to the control terminal ct6, the main terminals mt6a and mt6b. When the control terminal ct6 and the main terminal mt6a form a pair for inputting the drive signal, the fourth and sixth switching means are normally off type, and the control terminal ct4 and the main terminal The forward voltage direction between mt4a and the forward voltage direction between the control terminal ct6 and the main terminal mt6a are opposite, the control terminals ct4 and ct6 are connected, the main terminals mt4a and mt6a are connected, and a fourth DC A switching circuit characterized in that the fourth and sixth switching means are connected in series between both output terminals of a power source.