JPH01128342U - - Google Patents
Info
- Publication number
- JPH01128342U JPH01128342U JP2288988U JP2288988U JPH01128342U JP H01128342 U JPH01128342 U JP H01128342U JP 2288988 U JP2288988 U JP 2288988U JP 2288988 U JP2288988 U JP 2288988U JP H01128342 U JPH01128342 U JP H01128342U
- Authority
- JP
- Japan
- Prior art keywords
- output
- voltage
- power supply
- protection circuit
- high voltage
- 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.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 2
- 238000003079 width control Methods 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
Description
第１図はこの考案の一実施例である電子写真用
高圧電源の構成を示す回路図、第２図は第１図の
検出電圧を求めるための簡略化した回路図、第３
図は第２図の無負荷時における等価回路図、第４
図は出力電圧と検出電圧の関係を示す線図、第５
図は電圧制御用比較器の影響を受けない範囲を示
す線図、第６図はデツトタイム電圧とデツトタイ
ムの関係を示す線図、第７図は負荷抵抗と出力電
圧Ｖを分圧した電圧Ｖｇとの関係を示す線図であ
る。
１……ＩＣ（パルス幅制御スイツチングレギユ
レータ用）、２……電流制御用の比較器、３……
電圧制御用の比較器、Ａ，Ｂ……外部電源入力端
子、Ｃ……トリガ信号入力端子、Ｄ，Ｅ……出力
端子、Ｑ１……トリガ用トランジスタ、Ｑ２，Ｑ
３……保護回路のトランジスタ、Ｑ４……スイツ
チングトランジスタ、ＴＲ……昇圧トランジスタ
、ＳＷ……保護回路の動作を禁止するためのスイ
ツチ。
Figure 1 is a circuit diagram showing the configuration of a high voltage power supply for electrophotography which is an embodiment of this invention, Figure 2 is a simplified circuit diagram for determining the detection voltage of Figure 1, and Figure 3 is a simplified circuit diagram for determining the detection voltage of Figure 1.
The figure shows the equivalent circuit diagram at no load in Figure 2, and the equivalent circuit diagram in Figure 4.
The figure is a diagram showing the relationship between output voltage and detected voltage.
The figure is a diagram showing the range not affected by the voltage control comparator, Figure 6 is a diagram showing the relationship between dead time voltage and dead time, and Figure 7 is a diagram showing the relationship between the load resistance and the voltage Vg obtained by dividing the output voltage V. FIG. 1...IC (for pulse width control switching regulator), 2...Comparator for current control, 3...
Comparator for voltage control, A, B...External power input terminal, C...Trigger signal input terminal, D, E...Output terminal, Q1...Trigger transistor, Q2, Q
3...Transistor of the protection circuit, Q4...Switching transistor, TR...Boost transistor, SW...Switch for prohibiting the operation of the protection circuit.
Claims (1)
力を得るようにし、トリガ信号によつてその出力
のオン・オフを制御する出力制御手段と、該出力
の短絡あるいはアーキング発生時にそれを検出し
て前記出力を停止させる保護回路を備えた電子写
真用高圧電源において、 前記保護回路の動作を禁止するためのスイツチ
手段を設けたことを特徴とする電子写真用高圧電
源。[Claims for Utility Model Registration] Output control means for inputting an external power supply, boosting the voltage to obtain a high voltage output, and controlling on/off of the output by a trigger signal; A high-voltage power supply for electrophotography equipped with a protection circuit that detects the occurrence of short circuit or arcing and stops the output, characterized in that a switch means for prohibiting the operation of the protection circuit is provided. High voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288988U JPH01128342U (en) | 1988-02-23 | 1988-02-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2288988U JPH01128342U (en) | 1988-02-23 | 1988-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01128342U true JPH01128342U (en) | 1989-09-01 |
Family
ID=31241407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2288988U Pending JPH01128342U (en) | 1988-02-23 | 1988-02-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01128342U (en) |
-
1988
- 1988-02-23 JP JP2288988U patent/JPH01128342U/ja active Pending
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