JPS62181669A - Complex power unit - Google Patents

Abstract

PURPOSE:To simplify a complex power unit having a large number of systems by controlling a large number of power systems by one controller. CONSTITUTION:The primary sides of transformers mounted to conversion circuits 251-256 are given AC electrical energy in each conversion circuit 251-256, thus outputting voltage or currents at levels corresponding to the electrical energy and the characteristics of the transformers. Electrical energy on the primary sides of these transformers is controlled by signals applied to gates G1-G6. The levels of output voltage from respective conversion circuit 251-256 alter in response to the pulse width of the output voltage. Pulse width is determined in response to timer values previously set to each channel in timers IC2, IC3 by a microcomputer IC1, and pulse periods are decided by trigger pulses CO0 at predetermined periods outputted to a port PC6 by the microcomputer IC1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a composite power supply device that supplies power to a load that requires power from multiple systems with different voltages or upstream values, and particularly to a device that performs digital control.

[Prior Art] For example, a copying machine that performs electrostatic recording requires multiple systems of high-voltage power for the recording process. In order to perform high-quality recording with a copying machine or the like, the voltage or current value of this type of high-voltage power must be set with high precision and maintained stably. Therefore, in conventional power supplies that supply this type of power, a pulse transformer or the like is connected to the output end of a pulse width modulation circuit consisting of a sawtooth wave generator, a reference voltage generator, an analog voltage comparator, etc. A DC-DC converter circuit is constructed, and each system is provided with one. For this reason.

As the number of power supply systems increases, the circuit configuration becomes more complicated, and it is more susceptible to external noise and ambient temperature, requiring difficult adjustment work, and the output voltage (or current) may become unstable. There was a fear that it would become stable.

Therefore, by performing 5 time division processing, the present inventor
We proposed a composite FA device n (Japanese Patent Application No. 8163/1982) that enables voltage and current pulse width control of multiple systems of high-voltage power supply circuits with a single microcomputer. According to this, 'composite power supply'! The circuit configuration of lUm is simplified, and the number of parts is reduced to about half of the conventional one.

By the way, in order to reduce the size of the DC-DC converter, it is necessary to increase the pulse frequency of the pulse width modulation circuit (for example, 10 KHz or more) so that the loss in the pulse transformer is reduced. . However, as the frequency of the pulse increases, the processing time allowed by the microcomputer or the like that generates the pulse becomes extremely short.

Controlling multiple power supplies with a single microcomputer becomes cumbersome. Said patent vX (composite power supply system rX1
(Japanese Patent Application No. 8163), the power supplies of four types of systems are controlled by one microcomputer, but if the number of systems becomes more than that, there is a high possibility that the control will not be able to be done in time. . Time for determining the pulse width of pulse width control: 11 By setting a large unit time so that l<a, the processing amount required to generate one pulse is reduced, and the processing time can be shortened. However, if you do so, the pulse width adjustment will be rough and the precision voltage (or current) will not be adjusted properly.
I can't control it. Therefore, considering the processing power of the microcomputer, it is unreasonable to increase the pulse repetition frequency even higher (for example, about 20 Kllz) in order to miniaturize the device.

[Objective] The present invention simplifies the configuration of a complex @g'jAm, which has a large number of power systems, by controlling a large number of power supply systems with one control device. The first purpose is to make the composite power supply smaller and/or more efficient by increasing the frequency of width control, and the second purpose is to eliminate the influence of changes in the 1M boundary on various devices. .

"Configuration" In order to achieve the above object, the present invention generates a first clock (i and a second clock signal) having different periods from each other, and also includes a hardware timer for each power supply system. The timer counts the second clock signal in synchronization with the first clock signal.Then, a value corresponding to the power supply output signal level and the target output level is set in the timer, and the timer performs pulse width modulation. output the signal.

The signal controls the switching of the power on the primary side of the transformer.

Hardware timers can count short-period pulses,
Since the timer counts the number of pulses according to the preset value and outputs a predetermined signal, if the set value is set to a value corresponding to the pulse width to be controlled, the signal output by the timer can be used to control the primary of the transformer. side switching control can be performed.

In other words, when a microcomputer is used as a control device, the microcomputer does not need to directly perform processing to generate pulse signals, and even if the number of systems increases, a single microcomputer can handle the control. become.

By the way, in the process of a copying machine, for example, the developing operation is easily affected by temperature, and the separating operation is easily affected by humidity. Therefore, in a preferred embodiment of the present invention, temperature detection means and humidity detection means are provided, and the set value of the timer of at least one system is corrected according to the detection results thereof. Composite configured like this? I! By providing the source device in the copying machine, the influence of changes in the environment on the operation of the copying machine can be reduced, thereby achieving the second objective.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2a shows a schematic configuration of one type of copying machine embodying the present invention.

The schematic structure of the apparatus will be explained with reference to FIG. 2a.

21 is the contact glass on which the S draft is placed. An optical scanning system 22 is provided below the contact glass 21, and an image of light reflected from the original is formed on the photosensitive drum l via the optical scanning system 22. The photoreceptor drum l rotates clockwise in FIG. 1a.

On the other hand, the paper feed system has two stages, with paper feed cassettes 24 and 24.
25, the paper feed roller 26 or 2 is selected.
7, the recording paper is fed.

, 10 sheets pass between a registration roller 28 and a tip folding roller 29 and are led to the photosensitive drum l.

The vicinity of the photoreceptor drum 1 is shown enlarged in FIG.

Referring also to FIG. 1, a main charger 2. Eraser 31. b32, pre-transfer static elimination lamp 6, transfer charger 4° separation charger 52 separation claw 36. Before cleaning charger 7, fur brush 3
7. A static elimination lamp 8°, a humidity sensor 1O, etc. are arranged. A thermistor 9 is arranged inside the photoreceptor drum l to detect its temperature. Support shaft 1a of photoreceptor drum
is to detect the current flowing to the photoreceptor drum.

It is grounded via a resistor Rs.

The main charger 2 includes a charge wire 2a made of gold S and a casing 2b made of gold EL that surrounds and supports the charge wire 2a. The casing 2b is grounded and the charge wire 2
The output terminal M of the high voltage power supply unit 200 is connected to a. Metal developing sleeve 3 provided in the developing device 32
The output terminal B of the high-voltage power supply unit 200 is connected to. Is the pre-transfer static elimination lamp 6 high voltage? It is connected to the output terminal PTL of the Il source unit 200. The charge wires of the transfer charger 4, separation charger 5, and pre-cleaning charger 7 are connected to output terminals T, D, and C of the high-voltage power supply unit 1-200, respectively.

The static elimination lamp 8 is connected to the output terminal QL of the high voltage power supply unit 1-200. Thermistor9. Humidity sensor 10
and resistor Rs are each high voltage power supply unit I-20.
0 terminals BT, DI-T and DR.

Explain the general copy process. The photosensitive drum 1 is
The surface is uniformly charged with a high potential by the energization of the charger 2, and when it is irradiated with reflected light from the original, the surface potential changes depending on the light intensity.

With this, Shizu'PI! A latent image is formed. This stillness 1'1
! The latent image is visualized by toner when it passes through development (development) ft32. The fed recording paper is sent by the registration rollers 28 at a predetermined timing according to the rotation of the photoreceptor drum 1, and overlaps the surface of the photoreceptor drum 1 on which the toner image is formed. Thereafter, the toner image is transferred from the photosensitive drum 1 to the recording paper side by the urging of the transfer charger 4. Furthermore,
Due to the bias of the separation charger 5, the recording paper on which the toner image has been transferred is separated from the photoreceptor drum l and transferred to the conveyor belt 39.
Head to. Then, the recording paper passes through a fixing roller 40 having a built-in heater to fix the toner image thereon, and then passes through a paper ejection roller 41 to a copy tray 42 .

FIG. 2b shows the appearance of the operation board 300 of the copying machine shown in FIG. 2a. 2) Referring to FIG. 3, this operation board has a number of keys Kl, 2. 3°K4 a, 4 b
, to 5. 6 a, 6 b, 7°K8. 9n, 9b, 9c, KIO, KL l.

1 (12a, Kl 2b, K13. K
C, KS, Ktt and KI, and a number of indicators DI,
D2. D3. D4, D5. It is equipped with...

K1 is a key for specifying the operation mode of the sorter, and when the sorter is connected, one of normal mode, sort mode, and stack mode can be selected by operating this key. K2 and K3 are keys that specify the operation mode of the automatic document feeder.
You can specify either F (fully automatic) mode or 5ADF (anti-auto a) mode. □Also, by operating 2, you can specify either the normal mode, size uniformity mode, or automatic paper selection mode.

In the size uniformity mode, the copy magnification is automatically set according to the size of the original and paper (copy sheet) (for example, A4, 85, etc.). In automatic paper selection mode, the paper source is automatically selected according to the original size and copy magnification.

K4a and K4b are keys for adjusting the binding margin. That is, in this copying machine, it is possible to shift the correspondence between the position of the original image and the position on the copy sheet in the sub-scanning direction. Keys 4a and 4b are used to set binding margins for the front and back sides of the copy sheet, respectively.

K5 is a key for specifying the dimension specification variable magnification mode. In dimension specification variable magnification mode, after pressing 5 on the key (
Specify the dimensions of the original (using the numeric keypad described later), press the # key, press 5 again, specify the dimensions of the copy (using the numeric keypad), and press the # key. .

With this operation, the copy magnification is automatically set by calculating the dimensions of the original and the copy.

K6a and K6b are zoom magnification keys;
By pressing a, the copy magnification is adjusted in 1% increments, and by pressing K6b, the copy magnification is increased by 1%.
The unit is adjusted in the direction of decrease. However, in this example, the adjustment range of the copy magnification is limited to 50% to 200%.

K7 is a single-sided mode designation key, and each time this key is pressed, double-sided mode and single-sided mode are alternately designated. K8 is a document size specification key, and by pressing this key, A, 3. A4. A5. Any of the standard sizes B4, B5, and B6 can be specified in sequence. The specified document size is displayed on the display D5.

K9a, K9b, and K9c are keys for specifying any one of the predefined IO copy magnifications. In this example, the copy magnification is +50.61°71+8
2+ 87+ 93. Loots 115, 122 and I41 (%) are defined. By pressing 9a on the same magnification key, no matter what magnification is set, the magnification can be returned to 100% with a single key operation. When you press 9b on the enlargement key, higher magnifications are selected sequentially from among the 10 magnifications, and when you press 9c on the reduction key, you select the 10 magnifications mentioned above.
Among the seed magnifications, successively smaller magnifications are selected.

Note that, regardless of which mode the specified copy magnification is specified, the specified content is displayed in the display H%D5 as a maximum three-digit numerical value.

K1. O is a numeric keypad for inputting numerical values, and is used for setting the number of copies and for setting dimensions in the size/magnification mode. The set value is displayed on the display DI as a maximum of two digits.

Kll is a paper key for selecting a paper feed system, and by operating this key, either the middle paper feed tray 122 or the lower paper feed 1-ray 123 is selected alternately. The distinction of the selected paper feed system and the size of the copy sheet loaded in the tray of each paper feed system are displayed on display 113D3.

KI2a and Kl 2b are keys for adjusting copy density. In this example, the copy density can be adjusted in seven steps; by pressing the key 12a, the density is adjusted one step at a time in the darker direction, and by pressing the key K12b, the density is adjusted one step at a time in the lighter direction. The set copy density is displayed on the display D2.

K13 is a preheating key, KC is a clear and stop key that instructs to clear the numerical value entered with the numeric keypad 10 and to stop the operation after the copy operation has started, KS is the print start key that instructs the start of the copy operation, and r<■ is the This is an interrupt key.

However, the above explanation is for the operation in normal mode. That is, the mode switch SWt! shown in FIG. 2a! - By operating the parameter setting mode, the parameter setting mode can be selected, and when this mode is specified, the following will occur.

The numeric keypad KIO indicates the current between the main charger 2 and the photoconductor tram 1, the current between the copying charger 4 and the photoconductor drum 1, the current between the separate charger 5 (6), the current between the photoconductor drum 1, and the current between the charger 7 and the photoconductor before cleaning. It is used to instruct whether to check or set the current between the drums or the developing bias voltage.The copy magnification display D4 shows the current of the system selected by pressing 10 on the numeric keypad (when the photoreceptor drum is The zoom up key Kt3a is used to update the control target value of the system selected by the 5 numeric keypad KIO in the direction of increase. 6b is used to update the control target value of the system in a decreasing direction.

FIG. 3 shows the configuration of the electric circuit of the high voltage power supply unit I-200. See Figure 3. 205 is an AC-DC converter, which converts a predetermined DC power (voltage Vp
p). 210 is a stabilizing circuit, and the voltage VP
Convert P to a regulated voltage Vcc. ICI, I.C.
2 and IC3 are integrated circuits. Specifically, the ICI is a single-chip microcomputer 7811G manufactured by NEC Corporation, and although not shown, it has internal oscillation@M,
Serial I10 circuit circuit 2 control, timer, event counter, 8-person A/D (analog/digital) converter, ROM, RAM, parallel I10 circuit, etc.
It is growing.

IC2 and IC3 are programmable timers 8253. The integrated circuits rC2 and IC3 each have 3 internal circuits.
It has two timers.

This high voltage power supply unit 200 includes six conversion circuits 2
51. ．． 252, 253, 254. '255 and 256
It has. Each of the conversion circuits 251 to 256 includes a transformer, and a higher voltage is generated on the secondary side of the transformer than on the primary side. The conversion circuits 251 to 255 are equipped with diodes that convert alternating current on the secondary side of the transformer to direct current. The conversion circuits 251 to 256 also include variable resistors VRI and VR2 for detecting the respective output levels.
゜VR3, VR4, VR5 and VR6 are provided respectively.

Driver circuits 241, 242, 243, 244.
The output terminals of 245 and 246 are connected. The input terminals of the driver circuits 241 to 246 have gates Gl, G2 . G3. G4° The output terminals of G5 and G6 are connected. Gl to each game 1, G2. G3. G4.
One input terminal of G5 and G6 is output port PAO, PAI, PA of microcomputer TCI, respectively.
2°PA3. Connected to PA4 and PA5. Further, the other input terminal of each gate Gl, G2 and G3 is connected to the output terminal (OUT) of channels 0°1 and 2 of timer IC2, respectively, and the other input terminal of each gate Q4. G5 and G
The other input terminals of timer IC 6 are connected to the output terminals of channels 0.1 and 2 of timer IC 3, respectively.

All clock input terminals (C
LK) is the output port P of the microcomputer ICI.
Commonly connected to C4. Also.

All three gate signal input terminals (GATE) of timers IC2 and IC3 are commonly connected to the output port PCG of microcomputer IC1.

In this example, output port PC4 has 0.3μ! A pulse signal (TO) with a period of ee appears, and a pulse signal (COO) with a period of 48 μSeC is cursed at the output port PC6 (see FIG. 5a).

Output terminals M, T, D of each conversion circuit 251-256.

C, B, PTL and QL are respectively connected to the main charger 2.C as described above. Transfer charger 42 Separate charger 5. Charger 7° developing sleeve before cleaning 3. It is connected to a pre-transfer static elimination lamp 6 and a static elimination lamp 8. The conversion circuit 256 is shared by the pre-transfer static elimination lamp 6 and the static elimination lamp 8.

Variable resistor VRI, VR2, VR3°VR of each conversion circuit
4. The output terminals of VR5 and VR6 are connected to the analog input ports ANO and A of the microcomputer ICI, respectively.
NI, AN2. AN3. Connected to AN4 and AN5. Analog input port AN6 is connected to thermistor 9 shown in FIG. Analog input port ΔN7
is connected to the output terminal of the analog multiplexer 260. A resistor R5 and a humidity sensor IO shown in FIG. 1 are connected to input terminals A and B of the analog multiplexer 260, respectively. The control terminal G of the analog multiplexer 260 is connected to the microcomputer I.
It is connected to the output port PF7 of CI.

Terminals TxD, RxD and S of high voltage power supply unit 200
EL is connected to the serial interface w1180 of the copying process control unit 100. Further, a pulse signal synchronized with the rotation of the photosensitive drum 1 is applied to the terminal DCLK. Note that 220 is a reset signal generation circuit, and 230 is a monitor unit connectable for testing.

FIG. 4 shows the copying process control unit 100 of the copying machine shown in FIG. 2a and its peripheral electric circuit configuration. Referring to FIG. 4, the control unit 100 includes a microprocessor l 10. ROM (read-only memory 120.R
AM (reading/writing memory) +30. I10 port +40
．． A/D converter 150, serial interface circuit 160. ]70 and 180 are provided. Each serial interface circuit 160, 170 and 180 includes a sorter 600. ADF (automatic document feeder) 700
and a high voltage power supply unit 200 are connected. Note that the sorter 600 and ADF 700 are omitted in FIG. 2a.

The control unit 100 also includes a scanner unit 21.
0. Fixing unit 220. Lamp (for FF light) control unit 230. Paper feed unit 240. Driver 250. An operation board 300 and the like are connected.

Next, the operation of the high voltage power supply unit 200 will be explained.

The following Tables 1, 2, 3 and 4 respectively include:
Assignment of each port of microcomputer IC, IC
I internal timer assignment, external timer (IC2 and IC
3) and the correspondence of data or registers in each control system, and FIG. 6a shows a part of the memory map of the microcomputer ICI.

In addition, in Tables 1, 2, 3, and 4 of this specification and in the flowcharts in the drawings, among the ports, registers, memories, or signals indicated by symbols, those in parentheses refer to the corresponding port, register, memory, or signal. It indicates the content, and if it is not attached, it indicates the address or location.

Table 2 Table 3 Table 4 First, an outline of the operation of one circuit will be explained with reference to FIG.

Each of the conversion circuits 251 to 256 outputs voltage or current at a level corresponding to the electric energy and the characteristics of the transformer by applying alternating current electric energy to the primary side of the lance provided therein. The electrical energy on the primary side of these transformers is controlled by signals applied to gates 1-Gl to GG. For example, the electrical energy on the primary side of the transformer TI of the conversion circuit 251 is controlled by the signal ◯UTMC and the signal DRVMC.

If signal ○UT ~ IC is high level ■, signal D RV
Electrical energy becomes zero regardless of MC. Signal○［
When JTMC is at a low level, electrical energy is produced according to signal DRVMC. Each signal DRVMC, DRVT
C, DRVDC, DRVCC, DRVI3V and DRV
QV is pulse width modulated 1 as shown in Figure 5a.
It is a pulse with a period of 48 μsec.

Therefore, the level of the output voltage (or current) of each conversion circuit 251 to 256 changes according to this pulse width. By controlling this pulse width, the level of each power source is adjusted. Pulse double amount DRVMC, DRVTC, D
RVDC, DRVCC, DRVBV and DRVQ
Vha, 9ia I C2 and IC3 are generated. That is, the pulse width is determined in advance according to the timer value set by the microcomputer ICI to each channel of timers IC2 and IC3, and the pulse period is determined by the fixed cycle 1-Riga pulse C○0 that the microcomputer ICI outputs to the port PC6.
Determined by

That is, as shown in FIG. 5a, when the 1-rega pulse CO0 becomes high level H (in synchronization with the falling edge IJ of the clock TO), each signal DRVMC, DR'VTC.

DRVDC, DRVCC, DRVBV, and DRVQV are set to low level L, and each timer starts counting clock To from that timing, and when the count value reaches the timer setting value, the signal is reset to high level H. This operation is repeated every time 1-Riga pulse COO becomes high level H.

This signal generation operation is automatically performed by timers IC2 and IC3. Microcomputer ICI is a timer IC
The timer setting values for each channel of IC2 and IC3 are updated. Signals C○0 and To are microcomputer IC
Output by internal hardware of I. That is, To is the internal clock φ3 with a period of 0.3 μsec, and CO
2 is the output of the internal timer/event 1-counter. Timer/Event 1 - Counter registers ETM
Since the values shown in Table 2 are set for O and ETM l, a pulse with a period of 48 μsec is always output.

FIG. 7a shows a schematic operation of the microcomputer Ct. This will be explained with reference to FIG. 7d. When the power is turned on,
First, various ports, internal read/write memory, various internal registers, timers IC2, IC3, etc. are set to the initial state frfA, and an interval timer for sampling is started. This timer is the internal timer TMO of ICt, and as shown in Table 2 above, in this example, the clock is set to φ
By using J84 and setting the timer setting value to 26, 1m3e
It operates as an interval timer for c. Then, every time the internal timer TMO counts 1m5ec, an internal timer interrupt INTTO is generated in the microcomputer ICI.

When the interrupt INTTO occurs, a "sampling proportional calculation" subroutine 5PCAL is executed. If there is no abnormality in the result of subroutine 5PCAL, then the trigger input signal is checked. The trigger input (n) here is control data given from the copy process control unit 100, and is present in the receiving equal buffer register TRIG shown in FIG. 6a. This register TRTG is as shown in FIG. 6c. Six 1-Rica No. 14 MCT N,
TCI N.

Contains data pins corresponding to DCIN, CCIN, BVIN and QVIN. Each data bit is "1"
That is, a high level I-1 indicates that No. 18 is on, and "0", that is, a low level L, indicates that the signal is off. When at least one of the six 1-trigger signals is on, output of the clock pulse To and the trigger pulse C○0 is permitted. Then, execute the output processing subroutine ○UTr'UT and register TR
According to each 1-Riga signal of Ding G, six 1-Riga output output amount○UTMC.

OUT T C, 0UTDC, 0UTCC, 0UTI
3V and ou'rqv, microcomputer IC1
Each output capo -+-PAO, PΔI, PA2. PA3+
P A 4 + P A 5 + P A 6 and P
Output to A7.

Then, it waits for the internal timer interrupt INTTO again, and repeats the above processing in a loop. Subroutine SP CA
[- If the result is abnormal, or if all 1-Riga manual power (No. 8 is off, the clock pulse TO
and 1 to set the output of the rigged pulse CoO to be prohibited.

When an A/D conversion interrupt request and a reception interrupt request occur during the above loop processing, these interrupt requests are accepted and predetermined interrupt service processing is executed at t7. A
The /D conversion interrupt request occurs when A/D conversion is completed, and the reception interrupt is issued by the copy process control unit I-100.
Occurs when data is received from.

The processing contents of subroutine 5PCAL are shown in FIG. 7c.

See Figure 7c. This subroutine.

Broadly speaking, there are 8 treatments per meter. When you enter this subroutine, first registers AD, C
The contents of the NT are referred to, and processing is selectively performed according to the results.

If the content of ADCNT is 0, first 48 of the A/D converter
Select port ANO as the signal input terminal.

Note that when the input terminal is selected, the A/D converter automatically starts the conversion operation. Next, the sampling data is loaded into accumulator 8. The sampling data at this time is the level of the analog input port ANO, that is, the content of the current (main corona) MCD at the conversion port vt251. Next, it is determined whether the contents of accumulator A are within a predetermined normal value range. If it's abnormal.

Set the abnormality flag EMGMF to "1",
Return to main routine. If normal, the target value is determined from the contents of the accumulator! Then, the SMC is calculated by wt, and the result, that is, the error between the target value and the detected value is stored in an accumulator. Next, the contents of the accumulator and the proportional gain KM
and store the result in the accumulator. Finally, store the contents of the accumulator in register MCTI.
M (main corona system PWM control timer value register)
is added to update the contents of the register, and the process returns to the main routine.

If the content of ADCNT is 1, first select the boat ANI as the signal input terminal of the A/D converter.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the level of the analog input port ANI, that is, the content of the current (transfer corona) TCD in the conversion circuit 252. Next, it is determined whether the contents of accumulator A are within a predetermined normal value range.

If different '1;t, set different door flag EMGTF to rlJ
cent and return to the main routine. If normal, the target data STC is subtracted from the contents of the accumulator, and the result, that is, the error between the target value and the detected value, is stored in the accumulator. Next, the contents of the accumulator are multiplied by the proportional gain KT and the result is stored in the accumulator. Finally, the contents of the accumulator are added to the register TCT IM (transfer corona system PWM control timer value register) to update the contents of the register, and the process returns to the main routine.

If the content of ADCNT is 2, port AN2 is first selected as the signal input terminal of the A/D converter.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the level of the analog input port AN2, that is, the content of the current (separated corona') DCD in the conversion circuit 253. Next, it is determined whether the contents of the accumulator are within a predetermined normal value range.

If abnormal, set the abnormal flag EMGDF to 1J and return to the main routine. If normal, humidity data D
Bring I-ID to the accumulator low 1, divide the data by the conversion constant KN, and store the result in the accumulator. Further, the target first direct data SDCt is added to the contents of the accumulator, the result is stored in the accumulator, and the contents of the Jaccumulator are stored in register B. Next, the contents of the sampling data DCD of the 5-minute corona current are loaded again into the 7-accumulator A, the contents of the register B are subtracted from the contents, the result is multiplied by the proportional gain KD, and the result is transferred to the accumulator A. 1-a. Finally, store the contents of the accumulator in register OCTIM (separated corona system P
WM control timer value register) to update the contents of the register, and return to the main routine.

Therefore, the control details (actually the target value) for the one-separation corona system are as follows:
Varies depending on humidity.

If the content of ADCNT is 3, first the (n
Select the port l-A N 3 as the signal input terminal.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the level of the analog input capo-1-AN3, that is, the content of the current (cleaning corona) CCD in the conversion circuit 254.
It is determined whether the contents of the accumulator are within a predetermined normal value range. If ylS is normal, set the abnormality flag EMGCF to "1" and return to the main routine. If normal, the target data SCC is subtracted from the contents of the accumulator A, and the result, that is, the error between the target value and the detected value, is transferred to the accumulator. Next, the contents of the accumulator and the proportional gain KC are subjected to l4t2, and the result is stored in the accumulator. After Ek, store the contents of the accumulator in register OCTTM (cleaning corona system PWM control timer value register)
is added to update the contents of the register, and the process returns to the main routine.

If the content of ADCNT is 4, port AN4 is first selected as the signal input terminal of the A/D converter.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the level of the analog input port ANA, that is, the content of the voltage (developing bias voltage) BVD in the conversion circuit 255. Next, it is determined whether the contents of the accumulator are within a predetermined normal value range. If abnormal, abnormal flag EMG
Set BF to "1" and return to the main routine. If normal, the contents of the bias data register BiAS are loaded into the accumulator A. Register BTAS is included in the receive buffer shown in FIG. 6a, and the contents of this register are updated by instructions from the copy process control unit 1-100. Next, the contents of a bias data lookup table (not shown) are referred to according to the contents of the accumulator A, and the obtained data is stored in the accumulator. After storing the contents of accumulator A in the register, store 13'2 in accumulator A.
Load the image bias temperature BTD and set it to constant BTD,
The contents of register B and bias voltage target data SBV are added in sequence, and the result is stored in accumulator A.

Furthermore, the contents of accumulator Δ are transferred to register B.
After downloading, load the sampling data BVD again,
Calculate the contents of register B from that value, multiply the result by a proportional gain I<B, etc., and transfer the result to accumulator A.
Store in. Finally, the contents of the accumulator are stored in register 13 V T I M (rfl image bias system) P
"iVM control timer value register)" to update the contents of the register and return to the main routine. Therefore, the control contents (substantially the target value) of the developing bias system are corrected according to the temperature.

When the content of ADCNT is 5, ports 1-AN5 are first selected as the signal input terminals of the A/D converter.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the level of the analog input port AN5, that is, the content of the voltage (static elimination lamp) QVD in the conversion circuit 256. Next, it is determined whether the contents of the accumulator are within a predetermined normal value range.

If it is abnormal, send the abnormality flag EMGQF to rlJ.
- Return to main routine. In the case of normality, the target data SQV is subtracted from the contents of the accumulator A, and the result, ie, the error between the target value and the detected value is stored in the accumulator. Next, the contents of the accumulator and the proportional gain KQ are calculated, and the result is stored in the accumulator. Adding the contents of the accu l router to the register QVT rM (register of the PWM control timer value of the static elimination lamp system), updating the contents of the register,
Return to main routine.

If the content of ADCNT is 6, first select baud 1-AN6 as the signal input terminal of the A/D converter.

Next, the sampling data is loaded into accumulator A. The sampling data at this time is the content of temperature data BVD corresponding to the levels of the analog input capos 1 to AN6, that is, the state Jn of the thermistor 9. Next, it is determined whether the contents of the accumulator are within a predetermined normal value range. If it is abnormal, the abnormality flag EMGXF is set to "1" and the process returns to the main routine. If it's normal,
Return to main routine immediately.

When the content of ADCNT is 7, the state of flag FGI is first referred to and processing is selected accordingly.

When the flag FGI is "0", a high level I-1 is sent to the output port PF7. This causes analog multiplexer 260 to select input terminal B.

Next, port AN7 is used as the signal input terminal of the A/D converter.
Select. Next, load the sampling data into accumulator 8. The numbering data at this time is the level of the analog input capo-1-AN7, that is, the content of the output level DIID of the humidity sensor IO. next,
It is determined whether the contents of the accumulator are within a predetermined normal range. If abnormal, abnormal flag E
Sera 1- of M G l-IF to rlJ. Finally, the complement of flag FGI is placed in FGl, its state is inverted, and the process returns to the main routine.

If flag ['G1 is rN, set low level L to output port PF7. This causes analog multiplexer 260 to select input terminal Δ.

Next, the port ΔN7 is used as the signal input terminal of the A/D converter.
Select. Next, the sampling data is set to low 1 in accumulator 8. The sampling data at this time is
The level of analog input capo-1-A N7, that is, the resistance f
This is the content of the output level DRD (drum current) of I Rs. Next, it is determined whether the contents of the accumulator are within a predetermined normal value range. If it is abnormal,
Set the abnormality flag EMGRF to rlJ. lastly,
The complement of flag FG1 is set in FGI, its state is reversed, and the process returns to the main routine.

In other words, every time the content of ADCNT becomes 7, the flag FG
The state of I is reversed, and separation section humidity detection processing and drum current detection processing are performed alternately.

On the other hand, when the A/D converter starts the conversion operation, approximately 23
Conversion ends after 0 μsec. When the conversion is complete, A
/Generates a D conversion interrupt request. When this interrupt request occurs, the microcomputer ICI executes the A/D interrupt service routine shown in FIG. 7d.

See Figure 7d. In this routine, first, the contents of the register are temporarily saved, the average value of the A/D conversion result register (, RO, CRI, CR2, and CR3) inside the device C1 is calculated, and the result is stored in the accumulator A. do.

Next, set the starting address MCD11゜II of the sampling data vano core shown in Figure 6a to the L register (address pointer), and write the contents of the register ADCNT to the B register (-A, indicated by the contents of HL+H). The contents of accumulator A are stored in the memory (sampling buffer) at the address to be stored.
Increment the contents of NT by h(+1). the result.

If ADCNT is 8 or more, register ADCNT
Add O to 1-. Then, the previously saved registers are restored, one interrupt is enabled, and the process returns to the original routine.

That is, in this A/D interrupt service routine, sampled data is stored in a predetermined address of the receiver 8 buffer register and the contents of the 2 register ADCNT are updated.

Therefore, "sampling proportional calculation" subroutine 5PC
When AL is executed, A/D conversion of the specified (iN number) is started, and when the conversion is completed, the Δ/D interrupt service routine is executed and the converted data is fetched. The time required for this one processing is 1m5ec. Since the process is completed within a certain period of time, the process is executed at the timing shown in FIG. 5b.

That is, first, if ADCNT is 0, input capo-1-ANO is selected and A/D conversion is performed, and according to the result, the pulse width timer value of the main corona system ~I
Update CTl~1. Here, ADCNT is updated to 1, so the input capo-1-ANI is selected by the interval timer interrupt TNTTO that occurs when 1rnsec has elapsed from the first timing, and its A/D conversion is performed. Update the pulse width timer value TCTIM of the transfer corona system. Here ADCNT is 2
Therefore, when the next interval timer interrupt occurs, input port A N ,2 is selected and its A
/D conversion is performed, and the minute m corona system pulse width timer value DCT I M is updated according to the result. AD here
Since CNT is updated to 3, when the next interval timer interrupt occurs, input port AN3 is selected and its A/D conversion is performed, and the cleaning corona system pulse width timer value CCTIM is updated according to the result. do. Here, ADCNT is updated to 4, so when the primary interval timer interrupt occurs, input capo-1-A N
tl is selected and its A/D conversion is performed, and the pulse width timer value 13VTIM of the developing bias system is updated according to the result.

Here, ΔD CN T is updated to 5, so when the next interval timer interrupt occurs, six capo-h A
, select N5 and perform its A/D conversion, and then
Depending on the result, the pulse width timer value of the static electricity removal lamp system QTI
Update M. Here, ADCNT is updated to 6, so when the next interval timer interrupt occurs, 6 capo-1-A N 6 is selected and its A/D conversion is performed, and the result, that is, the developing bias temperature is obtained. It's crowded. Here, ADCNT is updated to 7, so when the first interval timer interrupt occurs, the input port AN7 is selected and its A/D conversion is performed, and the result, that is, either the minute@humidity or the drum current. Take in. AD here
Since CNT is cleared to 0, the above process is repeated.

Therefore, the control amount update process for the main corona system, the control amount update process for the transfer corona system, the control area update process for the separated corona system,
The cleaning corona system control ff1ffi update processing, the developing bias voltage system control amount update processing, the static elimination lamp system control amount update processing, and the temperature data detection processing are each repeatedly executed at a cycle of 13 m5ec, and the processing for detecting the humidity of the splitter section and the tram The current detection process is repeatedly executed at a cycle of 16 m5ec.

1-The generation of the RIGA output signal is specifically performed by the process shown in FIG. 7b. That is, the contents of register TRIG are loaded into the accumulator, and that data and fixed 1st shift 3F (1G
The lower 6 bits of the data are extracted by performing a logical product (AND) with the sub-display). Furthermore, the data is complemented bit by bit, and the result is output as
Output to.

When the data is sent from the copy process control unit 1-100, a receive interrupt request is generated, which causes the microcomputer ICI to execute the receive interrupt service routine rINrsR shown in FIG. 7e. This will be explained with reference to FIG. 7e.

In this routine, we first save the registers and save the serial interface unit's receive buffer register RX.
Load the contents of B into accumulator A and check whether the loaded data matches a predetermined synchronization character. If it is not a synchronization character, write the start address of the receive buffer shown in FIG. 6a, that is, the address of TRIG, to the HL register,
Transfer the contents of CNT to the B register and store it in the memory at the address indicated by the sum of the L and B registers.

The contents of accumulator A, that is, the received 1-by-1 data is stored. And receive by 1 - counter R
Increment X CN T by 1-. The receive by 1 counter RXCNT is cleared to 0 when its value becomes 7 or more and when a synchronization character is received.

Next, check the transmission end flag FST, and then
Wait until fL becomes "1". When it becomes "1", the 6th
The start address of the transmission buffer shown in figure a, that is, TXSYN
Transfer the address of C directly to the I-I L register,
The contents of the transmit byte counter TXCNT are loaded into the accumulator A, and the contents of the IIL register and accumulator A are loaded.
The contents of the memory on the transmission buffer indicated by the sum of the values are loaded into the accumulator, and the contents are stored in the transmission buffer TX13 of the serial interface unit. Next, transmit by 1 and increment the contents of the counter TXCNT by 1. However, if TXCNT becomes 12 or more, clear it to 0. Next, the contents of the previously saved registers are restored, interrupts are enabled, and this routine returns to the original routine.

(The data stored in the ffi buffer yTXB is
It is automatically (independently of software processing) converted into serial data and sent to the copying process control unit 100.

The transmission buffer and reception buffer of the macro computer ICI are as shown in FIG.
QVD, DHD, BTD.

D RD , abnormality flags EMG and EMG2 are sent to the copy process control 22 I-100. Also.

The 1-register data TRIG, bias data BTAS, +9τ1 direct data SMC, STC, SDC, SCC and SBV sent by the copying process control unit I-100 are sent to the receiving core of the microcomputer ICI (Fig. 6a). Please go to the next step.

Therefore, the reproduction process control unit 100 operates under high pressure 'i
l! Source unit l-200 actual voltage 9 circuit current.

You can know drum current, humidity, temperature, etc., and high pressure
It is also possible to arbitrarily change the control target values of each control system of the Shagen Units I-200.

FIG. 8a shows a schematic operation of the copy process control unit 1-100, and FIG. 6b shows a part of the memory map of the units 1 to 1. First, explanation will be given with reference to FIG. 8a. When the power is turned on, initial settings are performed, and then standby processing is performed.

In the standby process, processing for reading the status of various switches and various sensors, manual processing for two keys (Q processing 2 indication processing, etc.) are carried out, and the copy operation is determined and the status of the print key is checked.

When the print key is turned on after copying becomes possible, a predetermined copy process is executed, and when all copies are completed, the process returns to standby process.

The standby process G2 includes the subroutine rTE shown in Figure 8C.
Contains STJ. Is this subroutine high pressure? U
This is a process for setting parameters for the source unit 200. If the motor switch SW1 shown in FIG. 2a is off, this subroutine does nothing, but if SWI is on, the subroutines rsETsJ, rGENTR
GJ and ALLODJ are executed sequentially. The specific processing contents of these subroutines are shown in FIGS. 8d, 8e, and 8f.

First, the subroutine rsETsJ will be explained with reference to FIG. 8d. In this routine, first the zoom keys K 6 a and 6 b (see FIG. 2b) on the operation board are checked. If both are off, the contents of register DLTIM are cleared to 0 and the original routine is returned. If either one is on, then the register DLTLM is incremented by 1-. The result is compared with 2, and if they do not match, then compared with 20.

If the value matches 20, the register DLTIM is cleared to O, and if not, the process immediately returns to the original process.

If the contents of the register DLTIM match 2, the contents of the numeric keypad register TENKY are loaded into the B register, and the address of the SMC of the transmission buffer shown in FIG. 6b is set in the HL register.

Then, the contents of the buffer whose address is the sum of the contents of the HL register and the contents of the B register are loaded into the accumulator. Next, it is determined whether the zoom up key 6a or the zoom down key 6b is turned on. K
If 6a is on, the contents of the accumulator are incremented, and if K6b is on, the contents of the accumulator are decremented! ·do. And the contents of the accumulator, LI
The value of the sum of the contents of the L register and the contents of the B register is stored in a buffer whose address is the value, and the process returns to the original process.

The numeric keypad register TENKY holds a value corresponding to the operation of the numeric keypad KIO on the operation board. In other words, the numerical value assigned to the key operated immediately before is held in the numeric keypad register TENKY. For example, if you press the key that displays the number 3 on the numeric keypad KtO, that number 3 is held in the register T E N l (Y. Therefore, when subroutine rSETSJ is executed, the target value data specified by the numeric keypad is The contents of the key KGa or 6b are sequentially increased or decreased depending on the duration and number of times the key KGa or 6b is pressed.

For example, if you press the number 2 key on the numeric keypad and then continue to press the zoom up key Kt3a, the contents of the target value data SDC for the isolated corona system located at the address of the main corona system target value data SMC plus 2 will be displayed. , increases by +1 once every 20 counts of the value of register DLTTM.

Next, referring to FIG. 8e, subroutine rGENTRGJ
Explain. In this routine, first the clear/stop key KC on the operation board is checked. If key KC is on, clear the B register to 0 and save its contents to 1-
Set the trigger data TRIG and return to the original routine.

If the clear/stop key KC is off, the contents of the numeric keypad register TENKY are loaded into the accumulator and its value is checked.

If the value is 4 or less, 1 is set in the B register, and then the contents of the accumulator are decremented from 1 to 1. Check the result, and if the content is not negative, shift the content of the B register by 1 bit toward the upper digits (i.e. shift left), and decrement the content of the accumulator again until the result becomes negative. Repeat the above process.

When the contents of the accumulator become negative, the contents of the B register are set to trigger data TRTG.

In other words, if this subroutine is executed after any of the numerical keys 0, 1.213, and 4 on the numeric keypad is pressed, each bit 0.1, 2.3, and 4 of the trigger data TRIG will be set to rlJ. Other bits are set in rOJ. That is, the trigger data TRIG is set so that only the main corona system is energized when the key with the number 0 on the numeric keypad is pressed.
is set, and similarly, if you press the keys with numbers 1, 2. Trigger data TRIG is set (see Figure 6c).

Next, referring to FIG. 8f, subroutine rALL is executed.

D” will be explained. In this routine, first the contents of the numeric keypad register TENKY are loaded into the B register and its value is checked. If it is 4 or less, perform the following process. That is, the value of the address of MCDD at the head of the drum electric Jε buffer is loaded into the I-IL register, the contents of the drum@stream sampling data DRD are loaded into the accumulator, and the contents are combined with the contents of the HL register and the B register. Store at the address of the sum of the contents.

In other words, it is sent from the high voltage power supply Unino I-200, and
The tram current data held in DRD of the reception buffer shown in Fig. 6b is changed to MCDD and TC of the drum current buffer shown in Fig. 6b according to the value of the numeric keypad pressed at that time.
Stored in DD, 0CDD and CCDD. That is, when setting the drum current for the main corona system by pressing the number 0 key on the numeric keypad, the value of the current flowing to the photosensitive drum at that time is stored in MCDD of the drum current buffer. Drum currents for a transfer corona system, a separation corona system, and a cleaning corona system are stored in the TCDD, DCDD, and CCDD, respectively.

FIG. 8b shows a subroutine rD T S PJ that is part of the display processing in the standby processing of FIG. 8a. This will be explained with reference to FIG. 8b. First, check the state of the mode switch SW. When the SW is off, that is, in normal mode, copy magnification data is loaded into the accumulator, and numerical information corresponding to that value is displayed on the operation board's magnification display D.
Display on 4. When the switch SW is on, the contents of the numeric keypad register TENKY are loaded into the B register, and the MC located at the head of the drum current buffer shown in Fig. 6b is loaded.
Set the address value of DD to HL register, HL
Data at the address of the sum of the contents of the register and the contents of the B register is loaded into the accumulator, and the data is displayed on the magnification display iD4 on the operation board.

In other words, normally the copy magnification is displayed on the display D4, but when the mode switch SW is turned on and the drum current setting mode is set, the drum current MCD being adjusted is displayed on the display D4.
The value of D, TCDD, DCDD or CCDD is displayed. This display content is the actual drum current sampled by the high voltage high source unit 200, so check the actual drum current value on the display D4, and press 6a on the zoom up key and 6b on the zoom down key. The set values (i.e., target values) of each control system can be updated using the following information.

The receive interrupt service routine of copy process control unit 100 is shown in FIG. 8g. Is the unit 100 a high voltage internal serial interface unit? ! ! When data is received from the source unit 200, an interrupt request is generated and the process shown in FIG. 8g is executed.

This will be explained with reference to FIG. 8g. In this routine.

First, the register is saved, the contents of the receive buffer register RXB of the serial interface unit are loaded into the accumulator A, and it is checked whether the loaded data matches a predetermined synchronization character. If it is not a synchronous character, set the start address of the receive buffer shown in Figure 6b, that is, the address of MCD, in the HL register, set the contents of the receive byte counter RXCNT in the B register, and calculate the sum of the contents of the HL register and the B register. The contents of accumulator A, ie, the received 1-byte data, are stored in the memory at the address indicated by . Then, the received byte counter RXCNT is incremented. Reception (m-byte counter RXCNT is set to 0 when its value becomes 12 or more and when a synchronization character is received.
cleared.

Next, check the transmission end flag FST and see if it is "
Wait until it reaches 1. When the value becomes "1", set the start address of the transmission buffer shown in FIG. The contents of the memory on the transmission buffer indicated by the sum of are loaded into the accumulator, and the contents are stored in the transmission buffer TXI3 of the serial interface unit. Next, increment the contents of the transmission (iby1-counter. However, TX
When CNT becomes 8 or more, clear it to O. Next, the contents of the previously saved registers are restored, interrupts are enabled, and this routine returns to the original routine.

The data stored in the transmission buffer TX[3 is automatically converted (independently from software processing) into serial data and sent to the high voltage power supply 22 I-200.

The transmission 4B buffer and reception buffer of the copying process control unit 100 are as shown in FIG. and SBV are sent to the high voltage Wi source unit) l-2QO. Also,
Sampling data M CD and T CD transmitted by the high voltage power supply unit 200.

DCD, CCD, BVD, QVD, DI-ID, BTD
, DRD, abnormality flags EMG and EMG2 are stored in the receive buffer of FIG. 6b.

Copying process control unit 100 and high pressure W1g unino 1
-200 means that data transmission (U and reception) is performed alternately, but the first data transmission is from the copy process control unit 1.
00 is the initial setting (Gl in FIG. 8a). Once data transmission is started, the copying process control unit and the high voltage 1π source unit repeat data transmission and reception (n) according to the execution of their respective receive interrupt service routines.

The data in the buffer shown in FIG. 6a is retained even when the power is turned off by the battery BAT (see FIG. 3) connected to the power line of the microcomputer C1, and the data in the buffer shown in FIG. - and is maintained by a battery (not shown) connected to the power supply line of the copying process control unit 100.

In the above embodiment, an example in which the present invention is applied to a high-voltage power supply device of a copying machine has been described, but the present invention can also be applied to a general low-voltage power supply device, a fluorescent lamp energizing device', and a Dada.

[Effects] As described above, according to the present invention, a large number of mutually independent '/Il source systems can be centrally controlled with one control device, so the circuit configuration can be simplified even when the power supply system 7 has many resistors. Become. Moreover, since high-frequency pulses can be generated, the loss in the first lance is reduced, and the transformer can be made smaller. Furthermore, when humidity, temperature, etc. are detected and the detection results are reflected in the control of each control system as in the practical case, it is possible to prevent changes in device operation in response to changes in the environment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing components near the photosensitive drum of the copying machine shown in FIG. 2a and connections between them and an electric circuit. FIG. 2a is a front view showing the internal configuration of one type of copying machine embodying the present invention. FIG. 2b is a plan view showing the exterior of the operation board of the copying machine shown in FIG. 2a. FIG. 3 is a block diagram showing the electric circuit configuration of the high voltage power supply device (I-200) shown in FIG. 1. FIG. 4 shows the copying process control unit y l"10 of FIG.
FIG. 2 is a block diagram showing an electric circuit configuration of 0 and its peripheral circuits. Figure 5a is a waveform diagram showing an example of the timing of each number 48 in Figure 3, and Figure 5b is a waveform diagram of the microcomputer IC in Figure 3.
2 is a timing chart showing an outline of the operation timing of I. FIG. 6a is a memory map showing the structure of a part of the internal memory of the microcomputer IC1 of FIG. FIG. 6b is a memory map showing the configuration of a portion of the internal memory of the copying process control unit 100 of FIG. FIG. 6C is the register TRIG shown in FIG. 6a. This is a memory map showing the allocation of each bit of EMG and EMG2. 7a, 7b, 7c, 7d, and 7e are flowcharts showing the operation of the microcomputer ICI of FIG. 3. Figure 8a, Figure 8b, Figure 8C, Figure 8d, Figure 8c,
8f and 8g are flowcharts 1- showing the operation of the copying process control unit 100 of FIG. 4. FIG. 1: Photoconductor drum 2: Main charger 3 Dual image sleeve 4: Transfer charger 5: Separation charger 6: Pre-transfer static eliminator 7: Pre-cleaning charger 8: Static eliminator lamp 9: Thermistor 10: Humidity sensor 100: ;M copying process Control Unison 1-200 = High Voltage Electric 1 Gen Unino 1-300: Operation board TI, 2. T3. T4. Ding 5. T6 Nitrans (transformer) 241 to 246: Driver circuit (switching means) VRI to VR6: Variable resistor (feedback signal generation means) 205: AC-DC conversion circuit (power supply means) ICI
: Microcomputer IC2, IC3: Timer (ICI + rc2 + IC3: ffl child control means) SW: Mode switch KGa: 6b for zoom up key: 10 for zoom down key; numeric keypad

Claims (3)

[Claims] (1) A plurality of power output units each comprising a transformer, a switching means having an output terminal connected to the primary side of the transformer, and a feedback signal generating means for detecting the output level on the secondary side of the transformer; power supply means for supplying predetermined DC power to the input side of the switching means of each power output unit; and analog/digital conversion means for converting the output signal of the feedback signal generation means into a digital quantity; clock signal generating means for generating a clock signal and a second clock signal, and counting the second clock signal in synchronization with the first clock signal outputted by the means, and setting a timer according to the period of the first clock signal. a plurality of timers for generating a pulse signal having a pulse width according to the value and controlling switching means of each of the plurality of power output units with the pulse signal; a predetermined target output level for each power output unit; A composite power supply device comprising: electronic control means for setting each count value of each of the plurality of timers according to each output level of the feedback signal generation means. (2) The electronic control means includes humidity detection means, and detects at least one of the timers according to information outputted by the humidity detection means.
The composite power supply device according to claim 1, which corrects two setting values. (3) The electronic control means includes temperature detection means, and depending on the information outputted by the means, at least one of the timers
The composite power supply device according to claim (1) or (2), which corrects two setting values.