JPH0810366B2 - Power supply for image forming apparatus - Google Patents
Power supply for image forming apparatusInfo
- Publication number
- JPH0810366B2 JPH0810366B2 JP61291221A JP29122186A JPH0810366B2 JP H0810366 B2 JPH0810366 B2 JP H0810366B2 JP 61291221 A JP61291221 A JP 61291221A JP 29122186 A JP29122186 A JP 29122186A JP H0810366 B2 JPH0810366 B2 JP H0810366B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- voltage
- input
- control circuit
- image forming
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 （イ）産業上の利用分野 この発明は、画像形成装置の制御回路を駆動する電源
装置に関する。The present invention relates to a power supply device that drives a control circuit of an image forming apparatus.
（ロ）従来の技術 従来、画像形成装置において、制御回路を駆動する電
源装置に異常が発生した場合には、画像形成装置の動作
が停止するようになっている。(B) Related Art Conventionally, in an image forming apparatus, when an abnormality occurs in a power supply device that drives a control circuit, the operation of the image forming apparatus is stopped.
（ハ）発明が解決しようとする問題点 従って、このような従来の画像形成装置においては、
電源装置に異常が発生した場合に、それを表示すること
ができず使用者は動作停止の原因を把握することが困難
である。また、その場合に画像形成装置の動作が停止し
てしまうと、動作停止原因を調査する期間および電源装
置を補修する期間、使用者は画像形成装置を使用できず
不便である。(C) Problems to be Solved by the Invention Therefore, in such a conventional image forming apparatus,
When an abnormality occurs in the power supply device, it cannot be displayed and it is difficult for the user to understand the cause of the operation stop. If the operation of the image forming apparatus is stopped in that case, the user cannot use the image forming apparatus during the period for investigating the cause of the operation stop and the period for repairing the power supply device, which is inconvenient.
この発明は、このような事情を考慮してなされたもの
で、主電源と補助電源とを備え、電源装置の主電源に異
常が発生した場合には直ちに補助電源に切換えることに
より画像形成装置の正常な動作さを維持することが困難
な電源装置を提供するものである。The present invention has been made in view of the above circumstances, and includes a main power supply and an auxiliary power supply, and when an abnormality occurs in the main power supply of the power supply device, the auxiliary power supply is immediately switched to the image forming apparatus. The power supply device is difficult to maintain normal operation.
（ニ）問題点を解決するための手段 この発明は、交流電源から供給される電圧を直流定電
圧に変換して画像形成装置の制御回路に供給する電源装
置において、入力が前記交流電源に、出力が前記制御回
路にそれぞれ接続され直流定電圧を出力する主電源と、
入力が前記交流電源に接続され直流定電圧を出力する補
助電源と、前記主および補助電源の出力電圧を設定値と
比較する比較手段と、前記主電源の出力電圧が前記設定
値より低下したときに前記主電源を前記補助電源に切換
えて前記制御回路に前記補助電源の出力電圧を入力する
切換え手段と、前記制御回路の入力に並列接続され前記
切換え手段の切換え期間中に前記制御回路の入力電圧を
保持する電圧保持手段と、表示手段と、前記主電源の出
力電圧が制御回路に入力されている時に補助電源の出力
電圧が前記設定値より低下するとそれを表示手段に表示
させる制御手段とから構成されたことを特徴とする画像
形成装置の電源装置である。(D) Means for Solving the Problems The present invention relates to a power supply device that converts a voltage supplied from an AC power supply into a DC constant voltage and supplies the DC control voltage to a control circuit of an image forming apparatus. A main power source whose output is connected to the control circuit and outputs a constant DC voltage,
An auxiliary power source whose input is connected to the AC power source and outputs a constant DC voltage, comparing means for comparing the output voltage of the main and auxiliary power sources with a set value, and when the output voltage of the main power source is lower than the set value. Switching means for switching the main power supply to the auxiliary power supply and inputting the output voltage of the auxiliary power supply to the control circuit, and an input of the control circuit connected in parallel to the input of the control circuit during the switching period of the switching means. Voltage holding means for holding a voltage, display means, and control means for displaying the output voltage of the auxiliary power supply on the display means when the output voltage of the auxiliary power supply falls below the set value when the output voltage of the main power supply is input to the control circuit. And a power supply unit for an image forming apparatus.
なお、前記電圧保持手段には大容量コンデサンやバッ
テリーが使用される。A large-capacity condensate or a battery is used as the voltage holding means.
（ホ）作用 主電源に異常が発生して出力電圧が所定値よりも低下
すると、比較手段が出力し、切換え手段が制御回路への
入力を主電源から補助電源に切換える。そしてその切換
え期間中には電圧保持手段が制御回路の入力電圧を保持
する。これによって、主電源に異常が発生しても、制御
回路は正常な動作を持続する。また、主又は補助電源に
異常が発生した場合には、いずれの場合も表示手段に表
示されるので、使用者は、画像形成装置を継続して使用
した後、表示された電源の補修を行えばよい。(E) Action When an abnormality occurs in the main power supply and the output voltage falls below a predetermined value, the comparison means outputs and the switching means switches the input to the control circuit from the main power supply to the auxiliary power supply. Then, during the switching period, the voltage holding means holds the input voltage of the control circuit. This allows the control circuit to continue normal operation even if an abnormality occurs in the main power supply. In addition, when an abnormality occurs in the main or auxiliary power supply, the display means displays the error in either case, and the user repairs the displayed power supply after continuously using the image forming apparatus. I'll do it.
（ヘ）実施例 以下、図面に示す実施例に基づいてこの発明を詳述す
る。なお、これによってこの発明が限定されるものでは
ない。(F) Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. The present invention is not limited to this.
第１図はこの発明の一実施例を示すブロック図であ
り、１は交流電圧ｅを出力する交流電源、２は交流電圧
ｅを常閉リレー接点r1を介して端子a,bに入力し直流定
電圧E1を端子c,dから出力する主電源、３は交流電圧ｅ
を常閉リレー接点r2を介して端子f,gに入力し直流定電
圧E2を端子h,jから出力する補助電源、４はメモリ５に
接続されると共にI/Oポート６を介してリレーコイルR1
〜R4、表示灯L1,L2および各種制御負荷７に制御信号を
出力するCPUである。また、主電源２の（＋）出力端子
ｃおよび補助電源３の（＋）出力端子ｈはそれぞれ常閉
リレー接点r3および常閉リレー接点r4を介してCPU4の
（＋）電源入力端子ｍに接続され，主電源２および補助
電源３の（−）出力端子d,jは接地されると共にCPU4の
（−）電源入力端子ｎに接続されている。さらに、大容
量のコンデンサ８はCPU4の入力電源端子m,n間に接続さ
れ、主電源２および補助電源３の出力電圧E1,E2はそれ
ぞれA/D変換器9,10を介してCPU4に入力されメモリ５に
格納された設定電圧Erと比較される。なお、リレーコイ
ルR1,3R4は、E1＜ErのときにCPU4の出力によりそれぞれ
通電されて常閉リレー接点r1,r3を開路にすると共に常
開リレー接点r4を閉路にする。リレーコイルR2は、E2＜
ErのときにCPU4の出力により通電され常閉リレー接点r2
を開路にする。また、表示灯L1はE1＜Erのときに、表示
灯L2はE2＜ErのときにそれぞれCPU4の出力によって点灯
されるようになっている。FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is an AC power source that outputs an AC voltage e, 2 is an AC voltage e that is input to terminals a and b via a normally closed relay contact r1, Main power supply that outputs constant voltage E1 from terminals c and d, 3 is AC voltage e
Is input to terminals f and g via normally closed relay contact r2 and outputs constant DC voltage E2 from terminals h and j. 4 is connected to memory 5 and relay coil is connected via I / O port 6 R1
Is a CPU that outputs control signals to R4, indicator lights L1 and L2, and various control loads 7. The (+) output terminal c of the main power supply 2 and the (+) output terminal h of the auxiliary power supply 3 are connected to the (+) power supply input terminal m of the CPU 4 via the normally closed relay contact r3 and the normally closed relay contact r4, respectively. The (−) output terminals d and j of the main power supply 2 and the auxiliary power supply 3 are grounded and connected to the (−) power supply input terminal n of the CPU 4. Further, the large-capacity capacitor 8 is connected between the input power supply terminals m and n of the CPU 4, and the output voltages E1 and E2 of the main power supply 2 and the auxiliary power supply 3 are input to the CPU 4 via the A / D converters 9 and 10, respectively. It is compared with the set voltage Er stored in the memory 5. The relay coils R1, 3R4 are energized by the output of the CPU 4 when E1 <Er to open the normally closed relay contacts r1 and r3 and close the normally open relay contact r4. Relay coil R2 is E2 <
When Er is turned on, electricity is supplied by the output of CPU4 and normally closed relay contact r2
Open circuit. Further, the indicator lamp L1 is turned on by the output of the CPU 4 when E1 <Er, and the indicator lamp L2 is turned on by the output of the CPU 4 when E2 <Er.
このような構成において、交流電源１から電圧ｅが主
電源２および補助電源３に入力されCPU4の電源として直
流電圧E1が印加されると、CPU4は各種制御負荷７に制御
信号を出力して画像形成装置の制御を行う。この時、何
らかの原因で補助電源３に異常が発生し、出力電圧E2が
CPU4において設定電圧Erより低下したと判断されると、
表示灯L2が点灯されると共に、リレー接点r2が開路され
て補助電源３への入力が遮断される。従って、使用者
は、画像形成装置の非使用時に補助電源３を補修すれば
よい。In such a configuration, when the voltage e is input from the AC power supply 1 to the main power supply 2 and the auxiliary power supply 3 and the DC voltage E1 is applied as the power supply of the CPU 4, the CPU 4 outputs a control signal to various control loads 7 to display an image. Controls the forming device. At this time, the auxiliary power supply 3 becomes abnormal for some reason, and the output voltage E2
When the CPU4 determines that the voltage has dropped below the set voltage Er,
The indicator light L2 is turned on and the relay contact r2 is opened to cut off the input to the auxiliary power supply 3. Therefore, the user may repair the auxiliary power supply 3 when the image forming apparatus is not used.
また、画像形成装置の使用中に、主電源２に異常が発
生して、出力電圧E1がCPU4において設定電圧Erより低下
したと判断されると、表示灯L1が点灯され、リｒー接点
r1,r3が開路されて主電源２の入出力が遮断されると共
に、リレー接点r4が閉路されて補助電源３からの直流電
圧E2がCPU4の電源として入力され、また、リレー接点r3
とr4との切換え期間中は電圧E1によって充電されたコン
デンサ８からCPU4へ電圧が印加される。つまり、主電源
２に異常が発生してもCPU4の電源は補助電源３に連続的
に切換えられてCPU4は正常に作動するため、画像形成装
置の動作は継続される。When the output voltage E1 is determined to be lower than the set voltage Er in the CPU 4 when an abnormality occurs in the main power supply 2 during the use of the image forming apparatus, the indicator light L1 is turned on and the return contact is released.
r1 and r3 are opened to cut off the input / output of the main power supply 2, and the relay contact r4 is closed to input the DC voltage E2 from the auxiliary power supply 3 as the power supply of the CPU4, and the relay contact r3.
During the switching period between r4 and r4, the voltage is applied to the CPU 4 from the capacitor 8 charged by the voltage E1. That is, even if an abnormality occurs in the main power source 2, the power source of the CPU 4 is continuously switched to the auxiliary power source 3 and the CPU 4 operates normally, so that the operation of the image forming apparatus is continued.
従って、使用者は画像形成装置の非使時用まで待って
主電源２を補修することができる。Therefore, the user can wait until the image forming apparatus is not in use to repair the main power supply 2.
なお、前記実施例において、主電源２に異常が発生し
たときに、各種制御負荷７へのCPU4の出力を停止し、CP
U4の最小限の動作に必要な電力のみを補助電源３から供
給するようにすれば、CPU4の誤動作（暴走）が防止され
ると共に補助電源３は主電源２に比べて十分に小容量の
電源でよいことになる。In the above embodiment, when an abnormality occurs in the main power supply 2, the output of the CPU 4 to the various control loads 7 is stopped and the CP
If the auxiliary power supply 3 supplies only the power necessary for the minimum operation of U4, the malfunction (runaway) of the CPU 4 is prevented and the auxiliary power supply 3 has a sufficiently small capacity compared to the main power supply 2. Will be good.
（ト）発明の効果 この発明によれば、制御回路用電源に異常が発生して
も補助電源に切換えられて制御回路が異常なく作動する
ので、画像形成装置が暴走したり、作動を停止すること
がなく、使用者の作業能率を向上させる。さらに、主電
源の使用中に補助電源の異常を検出することができるの
で、予め補助電源を補修しておくことにより、主電源に
異常が発生した場合に、常に健全な補助電源に切換るこ
とができる。(G) Effect of the Invention According to the present invention, even if an abnormality occurs in the power supply for the control circuit, it is switched to the auxiliary power supply and the control circuit operates without abnormality. Therefore, the image forming apparatus runs out of control or stops operating. Improve the work efficiency of the user. Furthermore, since an abnormality in the auxiliary power supply can be detected while the main power supply is in use, repairing the auxiliary power supply in advance ensures that when the abnormality occurs in the main power supply, it always switches to a sound auxiliary power supply. You can
【図面の簡単な説明】 第１図はこの発明の一実施例を示すブロック図である。 １……交流電源、２……主電源、３……補助電源、４…
…CPU、８……コンデンサ、R1〜R4……リレーコイル、r
1〜r4……リレー接点、L1,L1……表示灯。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 ... AC power supply, 2 ... Main power supply, 3 ... Auxiliary power supply, 4 ...
… CPU, 8… Capacitor, R1 to R4… Relay coil, r
1 to r4 …… Relay contact, L1, L1 …… Indicator lamp.
Claims (1)
に変換して画像形成装置の制御回路に供給する電源装置
において、入力が前記交流電源に、出力が前記制御回路
にそれぞれ接続され直流定電圧を出力する主電源と、入
力が前記交流電源に接続され直流定電圧を出力する補助
電源と、前記主および補助電源の出力電圧を設定値と比
較する比較手段と、前記主電源の出力電圧が前記設定値
より低下したときに前記主電源を前記補助電源に切換え
て前記制御回路に前記補助電源の出力電圧を入力する切
換え手段と、前記制御回路の入力に並列接続され前記切
換え手段の切換え期間中に前記制御回路の入力電圧を保
持する電圧保持手段と、表示手段と、前記主電源の出力
電圧が制御回路に入力されている時に補助電源の出力電
圧が前記設定値より低下するとそれを表示手段に表示さ
せる制御手段とから構成されたことを特徴とする画像形
成装置の電源装置。1. A power supply device for converting a voltage supplied from an AC power supply into a DC constant voltage for supply to a control circuit of an image forming apparatus, wherein an input is connected to the AC power supply and an output is connected to the control circuit. A main power source that outputs a constant voltage, an auxiliary power source whose input is connected to the AC power source and outputs a constant DC voltage, a comparing unit that compares the output voltage of the main and auxiliary power sources with a set value, and an output of the main power source Switching means for switching the main power supply to the auxiliary power supply to input the output voltage of the auxiliary power supply to the control circuit when the voltage drops below the set value; and the switching means connected in parallel to the input of the control circuit. The voltage holding means for holding the input voltage of the control circuit during the switching period, the display means, and the output voltage of the auxiliary power supply when the output voltage of the main power supply is being input to the control circuit is above the set value. Power supply of the image forming apparatus characterized by being composed of the drops and control means for displaying it on the display means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61291221A JPH0810366B2 (en) | 1986-12-05 | 1986-12-05 | Power supply for image forming apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61291221A JPH0810366B2 (en) | 1986-12-05 | 1986-12-05 | Power supply for image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63143565A JPS63143565A (en) | 1988-06-15 |
| JPH0810366B2 true JPH0810366B2 (en) | 1996-01-31 |
Family
ID=17766038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61291221A Expired - Lifetime JPH0810366B2 (en) | 1986-12-05 | 1986-12-05 | Power supply for image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810366B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5000927B2 (en) * | 2006-01-05 | 2012-08-15 | 株式会社リコー | Image forming apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57117986A (en) * | 1981-01-16 | 1982-07-22 | Canon Inc | Electronic device |
| JPS58220168A (en) * | 1982-06-17 | 1983-12-21 | Canon Inc | Recording apparatus |
| JPS61157240A (en) * | 1984-12-28 | 1986-07-16 | キヤノン株式会社 | Forming device for picture |
| JPS61195873A (en) * | 1985-02-27 | 1986-08-30 | Usac Electronics Ind Co Ltd | Printer |
-
1986
- 1986-12-05 JP JP61291221A patent/JPH0810366B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63143565A (en) | 1988-06-15 |
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