JPH0458083U

JPH0458083U -

Info

Publication number: JPH0458083U
Application number: JP9851890U
Authority: JP
Priority date: 1990-09-21
Filing date: 1990-09-21
Publication date: 1992-05-19

Description

[Brief explanation of drawings]

第１図は第１〜第３の本考案それぞれの１実施
例を示す回路図、第２図は本考案者の先行技術の
点火用電力変換回路（点火回路）を示す回路図で
ある。符号の説明、１……ＤＣ−ＤＣコンバータ回路
、２，３……電源コンデンサ、４２……シールド
・ケース、４３……点火コイル、４３ａ……１次
コイル、４４……点火用放電ギヤツプ、ｔ１，ｔ
２……入力端子。 FIG. 1 is a circuit diagram showing one embodiment of each of the first to third inventions, and FIG. 2 is a circuit diagram showing an ignition power conversion circuit (ignition circuit) of the inventor's prior art. Explanation of symbols, 1...DC-DC converter circuit, 2, 3...Power supply capacitor, 42...Shield case, 43...Ignition coil, 43a...Primary coil, 44...Ignition discharge gap, t1 ,t
2...Input terminal.

Claims

[Claims for Utility Model Registration] (1) A second switching means is connected to a control terminal of the first switching means having a self-turn-off function, and the two switching means are connected so that the constant voltage means is sandwiched between them. On-signal output means is connected in series between both power supply terminals of the DC power source and outputs an on-signal to the first switching means, and the inductance means and the load connected directly or equivalently in series are connected to the first switching means. These are connected in series between the two power supply terminals so as to be sandwiched between the first switching means, the load, and the inductance means, and one non-controllable switch is connected to each of the series circuit of the first switching means, the load and the inductance means, and the capacitance means. In a power conversion circuit provided with a control means connected in parallel in a direction opposite to the voltage and controlling on/off of the second switching means based on the direction of current flowing through the inductance means, a main switching means of the first switching means is provided. 1. A power conversion circuit comprising: on-signal input blocking means for blocking the on-signal from being input to the first switching means when the current becomes smaller than a predetermined value. (2) A second switching means is connected to the control terminal of the first switching means having a self-turn-off function, and the two switching means are connected between both power supply terminals of the DC power supply so that the constant voltage means is sandwiched between the two switching means. On-signal output means is connected in series and outputs an on-signal to the first switching means, and the inductance means and the load connected directly or equivalently in series are sandwiched between the first switching means and the capacitance means. are connected in series between the two power supply terminals, and a non-controllable switch is connected in parallel in a direction opposite to the power supply voltage to a series circuit of the first switching means, the load and the inductance means, and one non-controllable switch to each of the capacitance means. In a power conversion circuit provided with a control means for controlling on/off of the second switching means based on the direction of the current of the inductance means, while the main current of the first switching means is larger than a predetermined value, . A power conversion circuit characterized in that a function of keeping the second switching means off is added to the control means. (3) A second switching means is connected to the control terminal of the first switching means having a self-turn-off function, and the two switching means are connected between both power supply terminals of the DC power supply so that the constant voltage means is sandwiched between the two switching means. On-signal output means is connected in series and outputs an on-signal to the first switching means, and the inductance means and the load connected directly or equivalently in series are sandwiched between the first switching means and the capacitance means. are connected in series between the two power supply terminals, and the power conversion circuit is provided with a control means for controlling on/off of the second switching means based on the direction of the current flowing through the inductance means, the first switching means 1. A power conversion circuit comprising a switching speed reduction means for slowing down the switching speed of the power converter circuit. (4) A power conversion circuit according to claim 3, characterized in that a capacitor is connected between the main terminal forming a pair with the control terminal and the control terminal for inputting a drive signal to the first switching means.