JPH0288475U

JPH0288475U -

Info

Publication number: JPH0288475U
Application number: JP16398188U
Authority: JP
Priority date: 1988-12-20
Filing date: 1988-12-20
Publication date: 1990-07-12

Description

[Brief explanation of the drawing]

第１図は、本考案ＤＣ―ＤＣコンバータの望ま
しい一実施例の概略構成図、第２図は第１図示Ｄ
Ｃ―ＤＣコンバータの動作に係る説明図、である
。図中、１０は車両搭載のバツテリ等の直流低電
圧源、１１はキー・スイツチに連動する等の電源
スイツチ、２１は第一比較器、２２，２３は抵抗
分圧回路構成用の抵抗、２４は抵抗、２５はキヤ
パシタ、２６，２７，２８は抵抗分圧回路構成用
の抵抗、２９は昇圧トランス一次電流検出抵抗、
３０は本考案により構成された全体としてのＤＣ
―ＤＣコンバータ、３１は第二比較器、３２，３
３はドライバ回路構成用のバイポーラ・トランジ
スタ、３４は昇圧トランス一次電流断続用のスイ
ツチング素子ないしその一例としてのＭＯＳ―Ｆ
ＥＴ、３５は昇圧トランス、３６はその一次巻線
、３７は同じくその二次巻線、３８は昇圧トラン
ス二次電流整流用のダイオード、３９はエネルギ
蓄積キヤパシタ、５０は負荷の一例としての容量
放電型内燃機関点火装置の点火回路部、５１は点
火コイル、５４は点火プラグ、である。 FIG. 1 is a schematic configuration diagram of a preferred embodiment of the DC-DC converter of the present invention, and FIG.
It is an explanatory diagram concerning operation of a C-DC converter. In the figure, 10 is a DC low voltage source such as a battery mounted on the vehicle, 11 is a power switch such as one linked to a key switch, 21 is a first comparator, 22 and 23 are resistors for configuring a resistive voltage divider circuit, and 24 is a resistor, 25 is a capacitor, 26, 27, 28 are resistors for configuring a resistor voltage divider circuit, 29 is a step-up transformer primary current detection resistor,
30 is the entire DC configured according to the present invention.
-DC converter, 31 is the second comparator, 32,3
3 is a bipolar transistor for driver circuit configuration, and 34 is a switching element for interrupting the primary current of the step-up transformer, or a MOS-F as an example thereof.
ET, 35 is a step-up transformer, 36 is its primary winding, 37 is also its secondary winding, 38 is a diode for rectifying the step-up transformer secondary current, 39 is an energy storage capacitor, and 50 is a capacitive discharge as an example of a load. The ignition circuit section of the type internal combustion engine ignition system includes an ignition coil 51 and a spark plug 54.

Claims

[Claims for Utility Model Registration] A DC-- which periodically cuts off the primary DC current of a step-up transformer using a switching element to obtain an AC high voltage waveform on the secondary side of the step-up transformer, which is rectified to output a DC high voltage. In the DC converter; means for monitoring the primary current of the step-up transformer flowing through the switching element and forcibly turning off the switching element when the magnitude thereof reaches a predetermined set current value; Monitor the output voltage of the next side,
A DC-DC converter comprising: means for forcibly turning off the switching element even when the switching element reaches a predetermined set voltage value.