JPS62286757A - Power source circuit of dot matrix printer - Google Patents
Power source circuit of dot matrix printerInfo
- Publication number
- JPS62286757A JPS62286757A JP13142986A JP13142986A JPS62286757A JP S62286757 A JPS62286757 A JP S62286757A JP 13142986 A JP13142986 A JP 13142986A JP 13142986 A JP13142986 A JP 13142986A JP S62286757 A JPS62286757 A JP S62286757A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- resistor
- transistor
- load
- 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
- 239000011159 matrix material Substances 0.000 title claims description 4
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
〔産業上の利用分野〕
本発明はドツトマトリックスプリンタの電源回路、特に
熱設計に関する。Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a power supply circuit for a dot matrix printer, particularly to thermal design.
ドツトマトリックスプリンタにおいて、電源の出力負荷
は印字するドツト密度にエフかなりの差があり、従来の
電源に最大負荷の連続動作にあっても定格電力？供給で
きる出力容量並びに放熱の〔発明が解決しようとする問
題点〕
上述し次従来の電源は、グラフィック等の高ドツト密度
の印字にあってはその能力を充分に発揮するが、英字数
字等の通常印字においては１７５〜し８の能力で間に合
ってしまう。一般的な使用方法としてグラフィック等の
印字のみを連続的に行うことはまれであり、余剰設計と
なる次点がある。In dot matrix printers, the output load of the power supply has a considerable difference in printed dot density, so even if the conventional power supply is in continuous operation at maximum load, the rated power is still low. [Problems to be solved by the invention] Regarding the output capacity that can be supplied and heat dissipation [problems to be solved by the invention] As mentioned above, the conventional power supply fully demonstrates its ability when printing high dot density such as graphics, but when printing alphanumeric characters etc. For normal printing, a capacity of 175 to 8 will suffice. As a general usage method, it is rare to print only graphics etc. continuously, and there is a runner-up that results in redundant design.
本発明の電源回路は、一時的な重負荷又は最大負荷は出
力するが連続的な重負荷又は最大負荷が要求される場合
には、電源回路の一次側電流値並びに時間を監視し負荷
側に制限を加えるものであり、電流の増大に伴う発熱を
制御し、電源回路の熱設計を最小にするものである。The power supply circuit of the present invention outputs a temporary heavy load or maximum load, but when continuous heavy load or maximum load is required, the power supply circuit monitors the primary side current value and time of the power supply circuit and outputs the load side. The purpose is to control the heat generation associated with the increase in current and to minimize the thermal design of the power supply circuit.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例であり、ドロッパー電源の簡
略回路である。本実施例において、−次側電流工１が増
えてくると電流検出回路１の電流検出抵抗比！の両端電
圧も高くなり、この電圧愼がある値になるとトランジス
タＱ１がオンとなり、これに伴いトランジスタＱ２もオ
ンとなる。トランジスタＱ２のコレクター電流工ｏは時
間監視用積分回路の抵抗比２並びにコンデンサーＣ１の
コンデンサーＣｔ ｋ充電する、このコンデンサー０１
の両端電圧はフォトカプラ２全通して二次側の抵抗比３
に現われる、ＭＰＵ３ｆｌこの抵抗比３の両端電圧をア
ナログボートＡＰにより監視することにＬり一次側の電
流工！の状態を知ることができる、ＭＰＵ３はこの電圧
レベルにより二次側の負荷４を制御する。各部品の定格
を適当に選択する事により、−次側電流工！を制御し１
？ｌ！！回路の発熱を制御できる。FIG. 1 shows one embodiment of the present invention and is a simplified circuit of a dropper power supply. In this embodiment, as the negative side current generator 1 increases, the current detection resistance ratio of the current detection circuit 1! The voltage across the transistor also increases, and when this voltage reaches a certain value, the transistor Q1 turns on, and accordingly, the transistor Q2 also turns on. The collector current o of the transistor Q2 is charged by the resistance ratio 2 of the time monitoring integrating circuit and the capacitor Ct k of the capacitor C1.
The voltage across the photocoupler 2 is the resistance ratio of the secondary side, which is 3.
By monitoring the voltage across this resistance ratio 3 of the MPU 3fl, which appears on the analog board AP, the primary side electric current is used! The MPU 3 controls the secondary side load 4 based on this voltage level. By appropriately selecting the ratings of each part, - next-side electrical work! control 1
? l! ! The heat generation of the circuit can be controlled.
以上説明したように本発明は、重負荷に伴い増大する一
次側′ＲＬ流を、電流検出回路にエフ監視し負荷制御を
行うことに工９、を源回路の熱設計に最小にできる効果
がある。As explained above, the present invention has the effect of minimizing the thermal design of the source circuit by monitoring the primary side RL current, which increases with heavy loads, in the current detection circuit and performing load control. be.
【図面の簡単な説明】
第１図は本発明の一実施例回路図である。
Ｒ１・・・電流検出抵抗Ｒ１−Ｑ＋ｅＱｚ°゛トランジ
スタ、几２ 、Ｒ３・・・抵抗、Ｃ１・・・コンデンサ
、１・・・電流検出回路、２・・・フォトカプラ、３・
・・ＭＰＵ、４・・・二次側負荷。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of an embodiment of the present invention. R1...Current detection resistor R1-Q+eQz°゛transistor, R3...Resistor, C1...Capacitor, 1...Current detection circuit, 2...Photocoupler, 3.
...MPU, 4...Secondary side load.
Claims (1)
ることを特徴とするドットマトリックスプリンタの電源
回路。A power supply circuit for a dot matrix printer, characterized in that a limit is imposed on a secondary side load in response to a primary side current of the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13142986A JPS62286757A (en) | 1986-06-05 | 1986-06-05 | Power source circuit of dot matrix printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13142986A JPS62286757A (en) | 1986-06-05 | 1986-06-05 | Power source circuit of dot matrix printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62286757A true JPS62286757A (en) | 1987-12-12 |
Family
ID=15057753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13142986A Pending JPS62286757A (en) | 1986-06-05 | 1986-06-05 | Power source circuit of dot matrix printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62286757A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0423811A2 (en) * | 1989-10-20 | 1991-04-24 | Canon Kabushiki Kaisha | Sheet transport unit for recording systems |
| US5114252A (en) * | 1989-10-13 | 1992-05-19 | Oki Electric Industry Co., Ltd. | Printer with protection from discharge line disconnection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916766A (en) * | 1982-07-21 | 1984-01-27 | Canon Inc | Controlling system of printing |
| JPS6174852A (en) * | 1984-09-21 | 1986-04-17 | Seiko Epson Corp | Printing apparatus |
-
1986
- 1986-06-05 JP JP13142986A patent/JPS62286757A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916766A (en) * | 1982-07-21 | 1984-01-27 | Canon Inc | Controlling system of printing |
| JPS6174852A (en) * | 1984-09-21 | 1986-04-17 | Seiko Epson Corp | Printing apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5114252A (en) * | 1989-10-13 | 1992-05-19 | Oki Electric Industry Co., Ltd. | Printer with protection from discharge line disconnection |
| EP0423811A2 (en) * | 1989-10-20 | 1991-04-24 | Canon Kabushiki Kaisha | Sheet transport unit for recording systems |
| US5126764A (en) * | 1989-10-20 | 1992-06-30 | Canon Kabushiki Kaisha | Sheet transport unit for recording systems |
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