JPH0169384U - - Google Patents
Info
- Publication number
- JPH0169384U JPH0169384U JP1987163853U JP16385387U JPH0169384U JP H0169384 U JPH0169384 U JP H0169384U JP 1987163853 U JP1987163853 U JP 1987163853U JP 16385387 U JP16385387 U JP 16385387U JP H0169384 U JPH0169384 U JP H0169384U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- resistor
- supply circuit
- terminal
- converter power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
Description
第１図は本考案の一実施例を示す蛍光表示管表
示装置用の過負荷保護回路付ＤＣ／ＤＣコンバー
タ電源回路図、第２図は、従来のＤＣ／ＤＣコン
バータ電源回路図である。
１……ＤＣ／ＤＣコンバーター電源、２……電
源入力端子、３……ＧＮＤ端子、４……電流検出
用抵抗、５，６……抵抗、７……電解コンデンサ
ー、８……ＰＮＰ型トランジスター、８Ｂ……Ｐ
ＮＰ型トランジスターのベース端子、８Ｃ……Ｐ
ＮＰ型トランジスターのコレクター端子、８Ｅ…
…ＰＮＰ型トランジスターのエミツタ端子、９…
…電流制限用抵抗。
FIG. 1 is a power supply circuit diagram of a DC/DC converter with an overload protection circuit for a fluorescent display tube display device showing an embodiment of the present invention, and FIG. 2 is a diagram of a conventional DC/DC converter power supply circuit. 1... DC/DC converter power supply, 2... Power input terminal, 3... GND terminal, 4... Current detection resistor, 5, 6... Resistor, 7... Electrolytic capacitor, 8... PNP type transistor, 8B...P
Base terminal of NP type transistor, 8C...P
Collector terminal of NP type transistor, 8E...
...PNP type transistor emitter terminal, 9...
...Resistance for current limiting.
Claims (1)
バータ電源回路において、一次側で、直流電流を
継続させ、パルス状の信号に変換するＮＰＮ型ト
ランジスターのベース端子にベース電流を制限す
る抵抗を介して、ＰＮＰ型トランジスターのコレ
クター端子をつなぎ、ＰＮＰ型トランジスターの
ベース端子は入力電圧を分割する抵抗の接点に接
続し、エミツター端子と、ベース端子間にＤＣ／
ＤＣコンバータ電源回路の入力電流を検出する抵
抗を設けて、過負荷時過大入力電流を阻止するこ
とを特徴とするＤＣ／ＤＣコンバータ電源回路。 In a DC/DC converter power supply circuit used for a fluorescent display, on the primary side, the DC current is passed through a resistor that limits the base current to the base terminal of an NPN transistor that continues to flow and converts it into a pulsed signal. The collector terminal of the PNP transistor is connected, the base terminal of the PNP transistor is connected to the contact of a resistor that divides the input voltage, and the DC/DC is connected between the emitter terminal and the base terminal.
A DC/DC converter power supply circuit characterized in that a resistor is provided to detect the input current of the DC converter power supply circuit to prevent excessive input current during overload.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987163853U JPH0623190Y2 (en) | 1987-10-26 | 1987-10-26 | DC / DC converter power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987163853U JPH0623190Y2 (en) | 1987-10-26 | 1987-10-26 | DC / DC converter power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0169384U true JPH0169384U (en) | 1989-05-09 |
| JPH0623190Y2 JPH0623190Y2 (en) | 1994-06-15 |
Family
ID=31448953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987163853U Expired - Lifetime JPH0623190Y2 (en) | 1987-10-26 | 1987-10-26 | DC / DC converter power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623190Y2 (en) |
-
1987
- 1987-10-26 JP JP1987163853U patent/JPH0623190Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623190Y2 (en) | 1994-06-15 |