JPH0998235A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the facsimile equipment in which its power consumption is reduced. SOLUTION: In the standby state of the facsimile equipment, a 1st power supply 15 is interrupted, a start detection circuit 17 detects call reception/ transmission by a telephone set and the facsimile equipment and operations of copying or the like. When the equipment is started, power from the 1st power supply 15 is supplied to each of control sections 10, 11 executing various service operations. After the end of service operations, the power from the 1st power supply 15 to each of the control sections 10, 11 is interrupted to reduce the power consumption of the equipment in the standby state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine provided with a plurality of control units, a memory commonly accessed by these control units, and a memory backup control means.

[0002]

2. Description of the Related Art Conventionally, in a facsimile apparatus, a power source is configured to be turned on / off by a switch, and even in a standby state where no operation such as copying is performed, all the control units and the memory have a power source. Is supplied, CP
The program is always operated by U or the like, and the memory is accessed by the read / write and refresh cycles from each control unit.

In a conventional backup circuit of a facsimile apparatus, power is supplied from the same power source to a plurality of control units, a memory and its peripheral circuits, and a backup circuit using a secondary battery. When the power supply is turned off, a decrease in the output voltage of the power supply is detected, and the power supply to the memory and its peripheral circuits is switched from the power supply to a backup power supply using a secondary battery.

[0004]

However, the above-mentioned conventional apparatus has the following drawbacks.

(1) Since power is supplied to each control unit and memory even in a standby state in which no operation related to transmission, reception, copying, etc. is performed, the CPU or I / O
Since the program is executed and the clock is operated and the memory accesses and refreshes from each control unit, extra power is consumed even in a circuit that does not require the operation.

(2) When the power source of the device is turned off, the voltage levels of the output signals from the plurality of control units to the memory and the memory peripheral circuit that are backed up by the secondary battery follow the power source voltage of the device. Since a through current flows through the input element of the memory peripheral circuit during the intermediate level period when the voltage drops with a constant and the logic is not fixed, a rush current flows in the discharge circuit of the secondary battery and the backup voltage decreases or the secondary voltage decreases. Over discharge current flows in the battery.

An object of the present invention is to provide a facsimile machine which can reduce power consumption.

[0008]

In order to achieve the above-mentioned object, a facsimile apparatus according to a first aspect of the present invention uses a plurality of control means, a storage means shared by these control means, and a secondary battery. Backup control means for supplying a backup power source for the storage means to the plurality of control means, start detection means for detecting an activation factor of the apparatus, first power source for supplying power to at least the plurality of control means, and the backup A second power source for supplying power to the control means and the activation detection means is provided, and when the device is in a standby state, the second power source remains on and the first power source is turned off to start the device. In doing so, the activation detection means detects the activation factor and turns on the first power supply. A facsimile machine according to a second aspect is the facsimile machine according to the first aspect, wherein when the inputs of the first power source and the second power source are both turned off, a fall of the output voltage of the second power source is caused. The output voltage of the first power source is delayed from the fall of the output voltage, the charging circuit of the secondary battery is connected to the second power source, and the discharging circuit of the secondary battery is a constant voltage output circuit via a diode. Is connected to the second power supply through another diode, and the output of the constant voltage output circuit is used as a backup power supply for the storage means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of a facsimile apparatus according to an embodiment of the present invention.

The facsimile apparatus according to the present embodiment has a main control section 10 that operates independently, a communication control section 11, and
It has a shared memory 12 as a storage means.

The main controller 10 controls the host operation of the apparatus, image processing, and input / output of the image scanner 20 and printer 21. The communication control unit 11 manages communication control of the line interface. The main control unit 10 and the communication control unit 11 are provided with a CPU that is the center of control, a ROM that stores control programs and the like, an I / O interface that is a bus master, and the like, and the CPU executes a control program to perform various processes. And an I / O interface which is a bus master controls data processing.

The shared memory 12 is composed of, for example, a semiconductor memory such as DRAM, and the shared memory 12 can be independently accessed from the control units 10 and 11 via the memory control unit 13.

The memory backup control means 14 uses a secondary battery and supplies backup power to the shared memory 12 to back up the data in the shared memory 12 when the input power of the device is turned off.

This facsimile apparatus has a first power supply 15 connected to an AC power supply and a second power supply 16. The first power supply 15 supplies power to the main control unit 10 and the communication control unit 11, and the second power supply is the memory backup control unit 14 and the activation detection unit 1 connected to the communication control unit 11.
Supply power to 7 and. The first power supply 15 is connected to a standby control means 18 that turns on / off the first power supply 15. When the inputs of the first power supply 15 and the second power supply 16 are both turned off, the fall of the output voltage of the second power supply 16 is delayed relative to the fall of the output voltage of the first power supply 15. Controlled. When the first power supply 15 is off, the activation detection means 17 sends an activation signal to the standby control means 18 when it detects an operation related to transmission or reception, copying, or an incoming signal, and the first power supply Turn on the output of 15. When the first power supply 15 is on, the main control unit 10 sends a standby signal to the standby control unit 18 after the communication of the communication control unit 11 ends and a predetermined time has elapsed, and the first control unit 18 The output voltage of the power supply 15 is turned off.

Next, the operation of the power supply of the present embodiment having the above configuration will be described.

FIG. 2 is an explanatory diagram showing the flow of data and signals during operation of the facsimile apparatus according to this embodiment. In FIG. 2, the same components as those in FIG. 1 have the same reference numerals. The description of these components is the same as that of FIG.

First, in the standby state where the facsimile apparatus is not transmitting / receiving, the standby control means 18
The output voltage of the first power supply 15 is turned off.

When transmitting a facsimile, the activation detection means 17 detects an operation related to reading of a document to be transmitted or an outgoing call and sends out an activation signal, and then the standby control means 18 receives the activation signal, and the standby control means 18 receives the activation signal. The first power supply 15 that had been powered off during the standby state of is turned on, and the first power supply is the main control unit 10 and the communication control unit 11.
And supply power to. As a result, the apparatus is set in a state in which the facsimile operation is possible.

In this state, the image data of the original read by the image scanner 20 is converted into the facsimile compressed data CD1 by the main controller 10 and transferred to the shared memory 12. Next, the communication control unit 11 reads the compressed data CD1, generates facsimile data to be communicated, and outputs it to the line via the modem 26 and the line control unit 27. After the communication is completed and a predetermined time has elapsed, the standby control unit 18 receives the standby signal 10a from the main control unit 10 and turns off the output voltage of the first power supply 15.

Further, in the case of performing facsimile reception, when the start detecting means 17 detects an operation for reading an original to be transmitted or detects an operation related to a call and sends a start signal, the standby control means 18 receives the start signal and the apparatus is activated. The output of the first power supply 15 whose power supply has been turned off during the standby state is turned on. As a result, the apparatus is set in a state in which the facsimile operation is possible.

In this state, the facsimile data received from the line is transferred to the shared memory 12 as the facsimile compressed data CD2 by the communication control unit 11, and then the main control unit 10 decompresses the compressed data CD2 into image data, It outputs to 21. After all the printouts due to the reception are completed and a predetermined time has elapsed, the standby control means 18 causes the main control unit 1 to operate.
The standby signal is received from 0, and the output of the first power supply 15 is turned off.

FIG. 3 is a block diagram showing the configuration of the memory backup control means 14 of this embodiment. 3, the same components as those in FIG. 1 are designated by the same reference numerals. The description of these components is the same as that of FIG.

The memory backup control means 14 has a first
Shared by the voltage detection circuit 31 including a comparator that detects the output voltage Vcc of the power supply 15, the secondary battery 32, and the charging circuit 33 that supplies a constant voltage from the output VBcc of the second power supply 16 to the secondary battery 32. Memory 12 and memory control unit 1
The DC-DC converter 34 as a constant voltage output circuit for outputting the backup voltage of No. 3 is provided.

The input of the DC-DC converter 34 is connected to the secondary battery 32 via the diode 35 and to the output VBcc of the second power source 16 via the diode 36.

Further, the memory 12 and the memory control unit 13 are
The first circuit is connected to the DC-DC converter 34 via a diode and is turned on / off by the output signal from the voltage detection circuit 31 via a transistor circuit 37.
Is connected to the output voltage Vcc of the power supply 15.

As shown in FIG. 3, during normal operation,
Since the output voltage Vcc of 15 V is stably supplied from the first power supply 15, the output signal PO of the voltage detection circuit 31 is
WDWN is high level. This output signal POWDW
The transistor circuit 37 is turned on by N, and the shared memory 12 and the memory control unit 13 are powered by the output voltage Vcc of the first power supply 15 and operate.

At this time, the output VBcc of the second power source 16
The secondary battery 32 is charged through the charging circuit 33.

Next, when the apparatus is in the standby state, the output voltage Vcc of the first power supply 15 is turned off as described in the explanation of FIG. At this time, the output voltage Vcc of the first power supply 15 is +
When the voltage drops from 5 V to a predetermined voltage or less, the output signal POWDWN of the voltage detection circuit 31 falls to a low level, and the transistor circuit 37 is turned off by the input of this output signal POWDWN. As a result, the shared memory 12 and the memory control unit 13 receive the backup power supply from the DC-DC converter 34 via the diode 36 from the second power supply 16 and hold the data.

Since the output voltage Vcc decreases from + 5V to 0V with a time constant due to the load capacity of the first power supply 15, the signal level input from each of the control units 10 and 11 to the memory control unit 13 is the output voltage Vcc. The through current It generated in the input element 38 of the memory control unit 13 when transitioning from the high level to the low intermediate level following the above is the output of the second power supply 16 as in the case of the backup power supply. It is absorbed from VBcc through the diode 36 and the DC-DC converter 34.

At this time, as in the normal operation, the secondary battery 32 is charged from the second power source 16 via the charging circuit 33.

Further, the input power of the apparatus is turned off, and the first
When both the power supply 15 and the second power supply 16 of the first power supply 15 are turned off and the output voltage Vcc of the first power supply 15 drops from + 5V to a predetermined voltage or less, the output signal PO of the voltage detection circuit 31 is output.
WDWN falls to low level and this output signal PO
The transistor circuit 37 that has received WDWN is turned off, and the shared memory 12 and the memory control unit 13 cause the output voltage VBcc of the second power supply 16 that falls after the output voltage Vcc of the first power supply 15 to fall to the secondary battery. 32 voltage Vb
When higher than at, the output voltage V of the second power supply 16
Backup power is supplied from the DC-DC converter 34 from Bcc via the diode 36. Further, when the output voltage VBcc of the second power supply 16 is lower than the voltage Vbat of the secondary battery 32, the secondary battery 32 starts discharging, and the secondary battery 32 DC-via the diode 35 via the diode 35.
From the DC converter 34 to the memory backup control means 1
The backup power is supplied to 4.

Since the output voltage Vcc decreases from + 5V to 0V in a time constant due to the load capacity of the first power supply 15, the control units 10 and 11 to which power is supplied from the first power supply 15 are supplied. The through current It generated in the input element 38 of the memory control unit 13 when the signal level input to the memory control unit 13 follows the output voltage Vcc and transits from the high level to the intermediate level of the low level is the second power supply. 1
Since the fall of the output voltage VBcc of No. 6 is delayed from the fall of the output voltage Vcc of the first power supply 15, the diode 36 and the DC-DC from the second power supply 16 which maintains the output voltage VBcc above a predetermined level. It can be absorbed via the converter 34.

As described above, according to the present embodiment, the first power supply 15 is turned off when the device is on standby, and the telephone,
The start detection circuit 17 detects an operation operation such as a call or an incoming call by facsimile, and a copy operation. When starting, various power supply operations are performed by the first power supply 15 to the control units 10 and 11. After the power supply is turned on and the service operation is completed, the first power supply 15 to each control unit 10 and 11 is supplied.
It is possible to reduce the power consumption of the device during standby by turning off the power supply by.

When both the inputs of the first power supply 15 and the second power supply 16 are turned off, the fall of the output voltage VBcc of the second power supply 16 is the output voltage V of the first power supply 15.
Since it is delayed from the fall of cc, the signals input from the plurality of control units 10 and 11 supplied from the first power supply 15 to the memory control unit 13 are changed in time constant from high level to low level. The second power supply 16 that maintains the output voltage equal to or higher than the predetermined value even when the through current flows through the input elements of the shared memory 12 and the memory control unit 13 to which the power is supplied from the backup control unit 14 is the secondary battery. Since the discharge circuit 32 is connected to the DC-DC converter 36 via the diode 35, the through current It is supplied from the second power source 16 and the secondary battery 32 is supplied.
The backup voltage can be stably supplied.

[0036]

As described above in detail, according to the facsimile apparatus of the first aspect, the first power source is turned off when the apparatus is on standby, and an operation such as detection or copying of a call or an incoming call by telephone or facsimile is performed. The operation is detected by the start detection means, and at the time of start, the power supply by the first power source to each control unit that executes various service operations is turned on, and after the service operation is completed, the first control unit It is possible to reduce the power consumption of the device during standby by turning off the power supply from the power source.

According to the second aspect of the present invention, when both the first power source input and the second power source input are turned off,
Since the fall of the output voltage of the second power supply is delayed from the fall of the output voltage of the first power supply, the signals input from the plurality of control units from the first power supply to the memory control unit are at high level. By changing from the low level to the low level in a time constant, the output voltage of the predetermined value or more is maintained even when the through current flows through the shared memory to which power is supplied from the backup control unit and the input element of the memory control unit. Since the second power source is connected to the constant voltage circuit via the diode in the discharge circuit of the secondary battery, the through current I
t is supplied from the second power supply, and the backup voltage can be stably supplied from the secondary battery.

[Brief description of drawings]

FIG. 1 is a block diagram of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing flows of data and signals during a facsimile operation according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a memory backup control means according to the embodiment of the present invention.

[Explanation of symbols]

 10 main control unit 11 communication control unit 12 shared memory 13 memory control unit 14 memory backup control means 15 first power supply 16 second power supply 17 startup detection means 18 standby control means 20 image scanner 21 printer 31 voltage detection circuit 32 secondary Battery 34 DC-DC converter

Claims (2)

[Claims] 1. A plurality of control means, a storage means shared by these control means, a backup control means for supplying a backup power source for the storage means to the plurality of control means by using a secondary battery, and an apparatus. The system includes a start detection unit that detects a start factor, a first power supply that supplies power to at least the plurality of control units, and a second power supply that supplies power to the backup control unit and the start detection unit. When the device is in the standby state, the first power source is turned off while the second power source remains on, and when the device is activated, the activation detecting means detects the activation factor to turn on the first power source. A facsimile machine characterized by being turned on. 2. When the inputs of the first power supply and the second power supply are both turned off, the fall of the output voltage of the second power supply is more than the fall of the output voltage of the first power supply. And the charging circuit of the secondary battery is connected to the second power source, the discharging circuit of the secondary battery is connected to the constant voltage output circuit via a diode, and further another diode is connected. 2. The facsimile apparatus according to claim 1, wherein the facsimile device is connected to the second power source via a power source and uses the output of the constant voltage output circuit as a backup power source of the storage means.