JPS6124690B2 - - Google Patents
Info
- Publication number
- JPS6124690B2 JPS6124690B2 JP13478878A JP13478878A JPS6124690B2 JP S6124690 B2 JPS6124690 B2 JP S6124690B2 JP 13478878 A JP13478878 A JP 13478878A JP 13478878 A JP13478878 A JP 13478878A JP S6124690 B2 JPS6124690 B2 JP S6124690B2
- Authority
- JP
- Japan
- Prior art keywords
- copying
- discharger
- control circuit
- voltage
- grounded
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Description
【発明の詳細な説明】
本発明は環境変化による複写性能の変動を減少
させ、安定した複写性能を有する複写機用交流高
圧電源装置を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide an AC high-voltage power supply device for a copying machine that reduces fluctuations in copying performance due to environmental changes and has stable copying performance.
従来における複写機用交流高圧電源装置として
は第１図に示すように構成されていた。 A conventional AC high-voltage power supply device for a copying machine was constructed as shown in FIG.
トランスの高圧コイル１の一端には放電器２が
接続され、この放電器２に対応して複写ドラム３
が配置され、他端はブリツジ整流回路４を通して
接地されるとともにブリツジ整流回路４にはコン
デンサ５、分圧用可変抵抗器６を介して制御回路
７が接続されて構成されており、高圧コイル１に
発生した高電圧は放電器２に印加され、放電安定
板および複写ドラム３を通じて接地に流れ、高圧
コイル１の他端はブリツジ整流回路４を介して接
地されているために高圧電流ＩOは図に示すよう
に正負非対称となる。ブリツジ整流回路４によつ
て整流された信号は第３図のようにＩOの正の半
波ＩO＋と負の半波ＩO−とに分かれ、平均したも
のＥSが制御回路７に印加される。 A discharger 2 is connected to one end of the high voltage coil 1 of the transformer, and a copying drum 3 is connected to the discharger 2.
The other end is grounded through a bridge rectifier circuit 4, and a control circuit 7 is connected to the bridge rectifier circuit 4 via a capacitor 5 and a voltage dividing variable resistor 6. The generated high voltage is applied to the discharger 2 and flows to ground through the discharge stabilizing plate and copying drum 3, and the other end of the high voltage coil 1 is grounded via the bridge rectifier circuit 4, so the high voltage current I O is As shown in , there is a positive/negative asymmetry. The signal rectified by the bridge rectifier circuit 4 is divided into a positive half-wave I O + and a negative half-wave I O - of I O as shown in FIG. 3, and the averaged signal E S is applied to the control circuit 7. be done.
一方、帯電器２の特性が気圧、温度、湿度など
の変化により、第４図の特性から特性に変化
した場合、その電流ＩOはＩO′となり、このＩO′
＋とＩO′−の平均により制御回路７が働き、電圧
ＶOはＶO′に減少する。これらのピーク値を比べ
ると放電器２′の等価内部抵抗が正の部分と負の
部分で異つており、負の部分の方が等価内部抵抗
が小さいためにＩO−が大きく変化する。制御回
路７はこれらの電流の平均値により働くため、第
４図の特性のときの電流ＩO′は正の半波は小さ
く負の半波は大きくなつている。 On the other hand, when the characteristics of the charger 2 change from the characteristics shown in FIG. 4 due to changes in atmospheric pressure, temperature, humidity, etc., the current I O becomes I O ', and this I O '
The control circuit 7 operates based on the average of + and I O ' - , and the voltage V O is reduced to V O '. Comparing these peak values, it is found that the equivalent internal resistance of the discharger 2' is different between the positive part and the negative part, and since the equivalent internal resistance is smaller in the negative part, I O - changes greatly. Since the control circuit 7 operates based on the average value of these currents, the current I O ' with the characteristics shown in FIG. 4 is small in the positive half wave and large in the negative half wave.
しかしながら、正、負の平均値はＩOでもＩO′
でも変つていないため、複写機の複写性能はI+I-
の差に影響されることから放電器２の特性変化に
より複写性能は大きく変化し不安定になるもので
あつた。 However, the positive and negative average values are I O as well as I O '
However, since it has not changed, the copying performance of the copier is I + I -
Since the copying performance is affected by the difference in the characteristics of the discharger 2, the copying performance changes greatly and becomes unstable due to changes in the characteristics of the discharger 2.
また、制御回路７が接地から浮いているため、
制御回路７の周辺を接地と絶縁しなければなら
ず、部品点数が増加しコスト面で不利になるもの
であつた。 Also, since the control circuit 7 is floating from the ground,
The area around the control circuit 7 must be insulated from ground, which increases the number of parts and is disadvantageous in terms of cost.
本発明は以上のような従来の欠点を除去するも
のである。 The present invention eliminates the drawbacks of the prior art as described above.
以下、本発明の実施例を図面第５図により説明
する。 Embodiments of the present invention will be described below with reference to FIG. 5.
交流高圧トランスの高圧コイル８の一端は放電
器９に接続され、この放電器９に対応する位置に
は複写ドラム１０が配置されこの複写ドラム１０
は接地されている。 One end of the high voltage coil 8 of the AC high voltage transformer is connected to a discharger 9, and a copying drum 10 is disposed at a position corresponding to the discharger 9.
is grounded.
また、高圧コイル８の他端は電流検出抵抗１１
を介して接地されるとともにダイオード１２、コ
ンデンサ１３、分圧用可変抵抗１４を介して差動
増幅器などからなる制御回路１５に接続され、コ
ンデンサ１３、分圧用可変抵抗１４、制御回路１
５はそれぞれ接地されている。 In addition, the other end of the high voltage coil 8 is connected to a current detection resistor 11.
It is grounded via a diode 12, a capacitor 13, and a voltage dividing variable resistor 14 to a control circuit 15 consisting of a differential amplifier, etc.
5 are each grounded.
この構成で高圧コイル８に発生した高電圧は放
電器９に印加され、放電安定板および複写ドラム
１０を通じて接地に流れ、高圧電流ｉOは電流検
出抵抗１１を通して高圧コイル８の他端に帰る。
この高圧電流ｉOはダイオード１２、コンデンサ
１３によつて半波整流され信号ｅSとなつて制御
回路１５に加えられ定電流制御を行なうものであ
る。 With this configuration, the high voltage generated in the high voltage coil 8 is applied to the discharger 9 and flows to ground through the discharge stabilizing plate and the copying drum 10, and the high voltage current i O returns to the other end of the high voltage coil 8 through the current detection resistor 11.
This high-voltage current i O is half-wave rectified by a diode 12 and a capacitor 13, and is applied as a signal e S to a control circuit 15 for constant current control.
この場合、ダイオード１２の極性は複写ドラム
１０の特性によつて正確に決定しなければならな
い。すなわち、セレンによる複写ドラム１０の場
合は負の電流、有機半導体による複写ドラム１０
の場合は正の電流を利用するため、複写ドラム１
０の特性によりダイオード１２の極性を変える必
要がある。 In this case, the polarity of diode 12 must be accurately determined depending on the characteristics of copying drum 10. That is, in the case of the copying drum 10 made of selenium, there is a negative current, and in the case of the copying drum 10 made of organic semiconductor,
In this case, since positive current is used, copying drum 1
It is necessary to change the polarity of the diode 12 depending on the characteristics of the diode 12.
このように本発明の構成によれば、負荷電流ｉ
Oの正あるいは負の半波のみを検出することがで
き、第４図に示すような放電器９の特性変化に対
しても負荷電流ｉOの検出されている正あるいは
負の半波の変動はなく、残りの半波についても制
御回路１５の働きによりＶO′が正負対称に減少す
るため変動が抑制され複写性能が安定化される。 As described above, according to the configuration of the present invention, the load current i
Only the positive or negative half-wave of O can be detected, and even when the characteristics of the discharger 9 change as shown in FIG. For the remaining half-waves as well, the control circuit 15 works to reduce V O ' symmetrically, suppressing fluctuations and stabilizing the copying performance.
また、複写性能が高圧電源のみで安定化される
ため余分な安定化のための部品や回路が不必要と
なり、コスト面で著しく有利となり信頼性の向上
も計れる。 Furthermore, since copying performance is stabilized using only a high-voltage power supply, no extra stabilizing parts or circuits are required, resulting in significant cost advantages and improved reliability.
さらに制御回路１５が接地できるため、この制
御回路１５を周辺より絶縁する必要がなくなり、
コスト面で有利にすることができる。 Furthermore, since the control circuit 15 can be grounded, there is no need to insulate the control circuit 15 from the surrounding area.
It can be advantageous in terms of cost.
また、従来のブリツジ整流回路では４個のダイ
オードが必要であるが、本発明の回路ではダイオ
ード１２だけであるため整流回路のコストも安価
とすることができる。 Further, while the conventional bridge rectifier circuit requires four diodes, the circuit of the present invention requires only the diode 12, so the cost of the rectifier circuit can be reduced.
そして、上記種々のことから全体の小型化も計
れることになる。 Further, due to the above-mentioned various factors, the overall size can be reduced.
以上のように本発明の複写機用交流高圧電源装
置は構成されることにより多くの利点が得られ工
業的価値の大なるものである。 As described above, the AC high voltage power supply device for a copying machine according to the present invention has many advantages and is of great industrial value.
第１図は従来の複写機用交流高圧電源装置の電
気的回路図、第２図は同装置の放電器の特性図、
第３図は同第１図における電流ＩOの整流後の波
形と制御回路に印加される信号ＥSの特性図、第
４図は放電器の特性変化に対する出力電流ＩOの
変化を示す特性図、第５図は本発明の複写機用交
流高圧電源装置の一実施例を示す電気的回路図で
ある。
８……高圧コイル、９……放電器、１０……複
写ドラム、１１……電流検出抵抗、１２……ダイ
オード、１３……コンデンサ、１４……分圧用可
変抵抗、１５……制御回路。
Figure 1 is an electrical circuit diagram of a conventional AC high-voltage power supply for copying machines, Figure 2 is a characteristic diagram of the discharger of the same equipment,
Figure 3 is a characteristic diagram of the rectified waveform of current I O in Figure 1 and the signal E S applied to the control circuit, and Figure 4 is a characteristic diagram showing changes in output current I O in response to changes in discharger characteristics. 5 are electrical circuit diagrams showing an embodiment of the AC high-voltage power supply device for a copying machine according to the present invention. 8... High voltage coil, 9... Discharger, 10... Copying drum, 11... Current detection resistor, 12... Diode, 13... Capacitor, 14... Variable resistor for voltage division, 15... Control circuit.
Claims (1)
器に接続し、この放電器に対応して接地された複
写ドラムを配置し、高圧コイルの他端を接地する
とともに制御回路を接続してなる複写機用交流高
圧電源装置において、高圧コイルの他端を電流検
出抵抗を介して接地して交流電流の正あるいは負
の半波のみを複写ドラムの特性に応じて検出し、
制御回路に帰還させて定電流制御を行なうように
したことを特徴とした複写機用交流高圧電源装
置。1. A copying machine in which one end of the high-voltage coil of an AC high-voltage transformer is connected to a discharger, a grounded copying drum is arranged corresponding to the discharger, and the other end of the high-voltage coil is grounded and connected to a control circuit. In an AC high-voltage power supply for use, the other end of the high-voltage coil is grounded via a current detection resistor to detect only the positive or negative half-wave of the alternating current depending on the characteristics of the copying drum.
An AC high-voltage power supply device for a copying machine, characterized in that constant current control is performed by feeding back to a control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13478878A JPS5560966A (en) | 1978-10-31 | 1978-10-31 | Ac high voltage power source for copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13478878A JPS5560966A (en) | 1978-10-31 | 1978-10-31 | Ac high voltage power source for copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5560966A JPS5560966A (en) | 1980-05-08 |
| JPS6124690B2 true JPS6124690B2 (en) | 1986-06-12 |
Family
ID=15136555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13478878A Granted JPS5560966A (en) | 1978-10-31 | 1978-10-31 | Ac high voltage power source for copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5560966A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5958461U (en) * | 1982-10-13 | 1984-04-16 | 長野愛知電機株式会社 | AC high voltage power supply for copying machines |
-
1978
- 1978-10-31 JP JP13478878A patent/JPS5560966A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5560966A (en) | 1980-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4189670A (en) | Power circuit for different stabilized DC voltages | |
| US3184637A (en) | Lamp monitoring apparatus | |
| US2843215A (en) | Automatic precipitator control | |
| JPS6124690B2 (en) | ||
| US5708572A (en) | Switched-mode power supply | |
| US4908753A (en) | High-tension power supply for an image recorder | |
| EP0050963A1 (en) | Ringing converter | |
| US3772585A (en) | Capacity compensation and discrimination circuits for high voltage power supply | |
| JPS6412181B2 (en) | ||
| JPS5660920A (en) | Voltage trailing control circuit | |
| JPS6037570Y2 (en) | High voltage power supply for electrophotographic copying machines | |
| JPH0540716Y2 (en) | ||
| JPS6229953Y2 (en) | ||
| JPS5597182A (en) | Switching regulator | |
| SU142122A1 (en) | The way to turn on the electronic lamp | |
| JPH0434104B2 (en) | ||
| JPS5655964A (en) | Charger | |
| JPH0423220B2 (en) | ||
| JPH0219773A (en) | Voltage detecting circuit | |
| JPS631024B2 (en) | ||
| JPH06335248A (en) | High-voltage power supply device | |
| JPS6151512B2 (en) | ||
| JPH06261547A (en) | High voltage power source apparatus | |
| GB2138977A (en) | Constant current source | |
| JPH0526432B2 (en) |