JP3187646B2 - Power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply used for a facsimile machine .

[0002]

2. Description of the Related Art In general, devices driven by electric power include:
Power supply is mounted. Here, a facsimile machine will be described as an example of a device equipped with the power supply device.

In a device such as a facsimile machine in which a standby state (standby state) is set, a switching power supply or the like is used as a power supply. This power supply always rises during standby and operation, and power is supplied from this power supply. In addition, power saving is achieved by directly controlling the primary side of the main power supply by a call signal from a telephone line or the like.

On the other hand, other devices include a main power supply,
Some devices have a sub power supply for standby. In this device, only the sub power supply rises during standby,
The main power supply is set to rise during operation, and low power consumption is achieved.

[0005] Furthermore, a completely new system (Japanese Patent Application No. 5-101) for low power consumption in the standby mode.
No. 108) has been proposed. In this system, starting and stopping of a main power supply (switching power supply) are controlled by a main power supply control means, and power is supplied to the main power supply control means from a secondary battery during standby and from the main power supply during operation. During standby, the main power supply is stopped, and only the main power control means operates (standby). During operation, a control signal from the main power control means is given to the main power supply, and the control signal causes power supply from the main power supply. Done. Therefore, power consumption can be further reduced.

[0006]

However, in the above-mentioned newly proposed system, when the time is displayed at the time of standby, the following problems occur.

[0007] A sub CP constituting the center of the main power supply control means
When the time is measured by the clock timer means incorporated in U, the supply power supply voltage varies depending on the state of charge of the secondary battery. Therefore, the time cannot be accurately measured by the clock timer means, and the Time cannot be displayed.

[0008] In order to display an accurate time, a sub CPU
It is conceivable to provide a real-time clock controlled by the above. However, since the exchange of data between the main CPU and the sub CPU and the system configuration of the sub CPU become complicated, the increase in cost and the realization are difficult.

Further, considering a configuration in which the main CPU can access the real-time clock, the time cannot be displayed in a standby mode in which the operation of the main power supply is stopped and power is not supplied to the main CPU.

An object of the present invention is to provide a power supply system that operates independently of the state of the main power supply.
Accurate time can be displayed and the main power
It is an object of the present invention to provide a power supply device capable of suppressing battery consumption at the time of power off.

[0011]

According to the first aspect of the present invention,
Using a clock means for measuring the time and the first display unit,
A power supply device used in a facsimile apparatus having first display means for performing a kind of display, comprising: a main power supply for inputting AC power from outside to supply power to each means of the facsimile apparatus; and a timer. , Turn on the main power,
Main power control means for controlling off, and a battery for supplying power to the main power control means when the main power is off
And the main power control means is independent of the first display unit.
A second method of displaying time using a controllable second display unit
Display means, and the main power control means comprises:
Is off, the time measured by the timer
The features and this <br/> be controlled so as to display by said second display means.

According to a second aspect of the present invention, in the power supply device according to the first aspect, the battery includes a secondary battery that can be charged by the main power supply.

According to a third aspect of the present invention, in the power supply device of the first aspect, the battery includes a solar cell.

According to a fourth aspect of the present invention, in the power supply device according to the second aspect, when the main power supply is on, the main power supply charges the secondary battery.

According to a fifth aspect of the present invention, in the power supply device according to the first aspect, the battery includes a secondary battery and a solar battery, and when the solar battery outputs power, the main power supply control is performed. The means receives the power supplied from the solar cell, and when the solar cell is not outputting power,
The main power supply control means receives electric power supplied from the secondary battery.

According to a sixth aspect of the present invention, in the power supply device according to the fifth aspect, the solar battery charges the secondary battery.

According to a seventh aspect of the present invention, in the power supply device according to the sixth aspect, when the main power is on, the secondary battery is charged by the main power, the main power is off, and When the solar cell is not outputting power, the secondary battery is charged by the solar cell.

According to an eighth aspect of the present invention, in the power supply device according to the second aspect, the main power supply control means turns on the main power supply or charges the secondary battery in response to an input of a start signal. The main power supply is controlled to be turned on.

According to a ninth aspect of the present invention, in the power supply device according to the eighth aspect, the start signal is transmitted to the facsimile apparatus.
The main power supply control means is inputted from the corresponding means among the respective means of the device.

According to a tenth aspect of the present invention, in the power supply device according to the ninth aspect, the start signal is transmitted by the facsimile.
Call signal from the connected line in the apparatus, the facsimile
Key input signal from the operation means provided in Li device, wherein
The signal is any one of detection signals for an off-hook of a handset provided in the facsimile apparatus .

According to an eleventh aspect of the present invention, in the power supply device according to the first aspect, the facsimile apparatus has a main body control means for controlling each means of the facsimile apparatus, and the main power supply control means includes a main body control means. The main power supply is turned off based on a control signal from a control means.

[0022] The invention of claim 12, wherein, in the power supply device according to claim 11, wherein the battery comprises a secondary battery chargeable by said main power supply, the main body control unit, the file
Outputting the control signal to the main power control means in response to the end of the communication operation of the x-millimeter , the main power control means turning off the main power based on the control signal and charging the secondary battery by the main power. Is terminated.

The invention according to claim 13 is the power supply device according to claim 2, further comprising timer means for measuring a charging time of the secondary battery by the main power supply, wherein the main power supply control means comprises: When the charging time measured by the timer means reaches a predetermined time, the main power supply is turned off to terminate charging of the secondary battery by the main power supply.

According to a fourteenth aspect of the present invention, in the power supply device according to the second aspect, the power supply apparatus further includes a voltage detection means for detecting a voltage of the secondary battery by the main power supply, and the main power supply control means includes: The main power supply is turned on and off in accordance with the detection result of the voltage detection means to control charging of the secondary battery by the main power supply.

According to a fifteenth aspect of the present invention, in the power supply device according to the first aspect, the main power supply comprises a switching power supply.

According to a sixteenth aspect of the present invention, in the power supply device of the first aspect, it is preferable that the main power supply is turned on.
Based on the time measured by the clock means
Time correction to correct the time measured by the timer
It is characterized by comprising means .

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a facsimile apparatus using one embodiment of the power supply device of the present invention.

As shown in FIG. 1, the facsimile apparatus 1 of this embodiment has a C
PU2 is provided. The CPU 2 has a RAM 4, a non-volatile RAM 5, a character generator (hereinafter referred to as CG) 6, a reading unit 7, a recording unit 8, a modem unit 9, and a network control unit (hereinafter referred to as N) according to a program stored in the ROM 3.
CU) 10, the operation unit 13 and the display unit 14 are controlled.

The RAM 4 stores the binarized image data read by the reading unit 7 or the binarized image data recorded in the recording unit 8. The binary image data read by the reading unit 7 is modulated by the modem unit 9, and the modulated signal is output to the telephone line 11 via the NCU 10. On the other hand, the binarized image data recorded in the recording unit 8 is data obtained by demodulating an analog waveform signal input from the telephone line 11 via the NCU 10 and the modem unit 9.

The non-volatile RAM 5 stores the facsimile device 1
And a storage unit for securely storing data to be stored (for example, a speed dial number) when the power supply is turned off.

The CG 6 comprises a ROM for storing characters such as JIS codes and ASCII codes.
From the OM, character data corresponding to a predetermined code is extracted as required by 2-byte data under the control of the CPU 2.

The reading section 7 is composed of a DMA controller, an image processing IC, an image sensor, a CMOS logic IC, and the like, and binarizes data read using a contact sensor (CS) under the control of the CPU 2, and The binarized data is sequentially sent to the RAM 4. The state of setting the original on the reading unit 7 is detected by a mechanical original sensor (included in the operation unit 13) provided on the original conveyance path, and an original detection signal indicating the setting state of the original is controlled by the main power supply control. Input to the unit 15. By using a mechanical original sensor (mechanical switch) instead of a photo sensor or the like as the original sensor here, power consumption during standby can be suppressed, and consumption of a secondary battery described later can be prevented. .

The recording section 8 is composed of a DMA controller, an ink jet recording apparatus, a CMOS logic IC, and the like. The recording section 8 takes out recording data stored in the RAM 4 under the control of the CPU 2 and records and outputs it as a hard copy.

The modem section 9 is composed of G3 and G2 modems, a clock generation circuit connected to these modems, and the like. The modem section 9 modulates transmission data stored in the RAM 4 under the control of the CPU 2 and transmits the modulated data through the NCU 10. Output to the telephone line 11. Further, the modem unit 9 introduces an analog signal of the telephone line 11 through the NCU 10, modulates the signal, and stores binary data in the RAM 4.

The NCU 10 switches and connects the telephone line 11 to either the modem unit 9 or the telephone 12 under the control of the CPU 2. The NCU 10 has means for detecting a call signal (CI), and sends an incoming signal to the main power supply control unit 15 when the call signal is detected.

The telephone 12 is integrated with the facsimile machine 1. Specifically, the telephone 12 includes a handset and a speech network, a dialer, a numeric keypad or a one-touch key, and the like.

The operation unit 13 includes keys for starting image transmission and reception, and fine, standard, and
It is composed of a mode selection key for designating an operation mode such as automatic reception, a ten-key or one-touch key for dialing, and a document detection switch (30 in FIG. 2, the above-described document sensor). When these keys are pressed or the document detection switch detects a document,
An ON signal or a document detection signal is input to the main power control unit 15.

The display unit 14 includes a pictogram LCD for displaying 7 segments for clock display and various modes, and a dot matrix LCD for displaying 5 × 7 dots, 16 digits × 1 line.
LCD module combining LED and LCD, etc., and emoticon LCD and dot matrix LCD
Are independent of each other.

The main power supply control unit 15 controls the facsimile machine 1
It is composed of a circuit for controlling energization (power supply) to each part (block) of the whole, and this circuit is composed of a one-chip microcomputer, a capacitor type secondary battery, and the like. The main power control unit 15 is set to be drivable with the power supplied from the secondary battery. Main power controller 15
When a document detection signal from the operation unit 13, an incoming signal from the NCU 10 or an ON signal from the operation unit 13 is input, a start signal is sent to the main power supply 16. The display of the pictograph LCD on the display unit 14 is controlled by the microcomputer of the main power supply control unit 15, and the display of the dot matrix LCD on the display unit 14 is controlled by the CPU 2.

The main power supply 16 is composed of a switching power supply that receives alternating current power (AC). The main power supply 16 is composed of a switching power supply that can be turned on and off by switching from the outside, and this switching power supply performs power supply and power supply stop according to a start signal and a stop signal from the main power supply control unit 15, respectively.

Next, the schematic configuration of the main power supply control section 15 and its peripheral configuration will be described with reference to FIG. FIG. 2 is a circuit diagram showing a schematic configuration of a main power control unit used in the facsimile apparatus of FIG. 1 and a configuration around it.

The voltage Vcc is, as shown in FIG.
The power is supplied from three power supply sources via a DC converter 22 (shown in FIG. 2). The first power supply is + 5V
The second power supply source is a solar cell 23, and the third power supply source is a capacitor type secondary battery 19. The priority of these three power supplies is determined by the respective voltages, the state of charge of the secondary voltage 19, the Schottky barrier diode 20 for backflow prevention, and the diode 29 for backflow prevention.

The voltage from the main power supply 16 is set to 4.8 V by the Schottky barrier diode 20 for backflow prevention, and the voltage from the solar cell 23 is set to the diode 2 for backflow prevention.
9, the voltage is set to 4.6 V, and the voltage from the secondary battery 19 is set according to the state of charge. In addition, depending on the orientation of the backflow prevention Schottky barrier diode 20 and the backflow prevention diode 29, the power supply becomes the most significant in the rising state of the main power supply 16, charging the rechargeable battery 19 through the resistor 21 and the DC-DC converter. The power as Vcc is supplied through 22. During this power supply, the solar cell 23 has a low potential, and no current flows from the solar cell 23.

The main power supply 16 is not operating and the solar cell 23
Is supplying power, that is, the main power supply 16 is not operating but the light energy is supplied, and if the potential of the secondary battery 19 is higher than the potential of the solar battery 23, Vc via the DC converter 22
Power as c is supplied, and no power is supplied from the solar cell 23. When the potential of the secondary battery 19 is lower than the potential of the solar battery 23, power as Vcc is supplied from the solar battery 23 via the DC-DC converter 22, and the secondary battery 19 is charged through the resistor 21 at the same time.

When the main power supply 16 is not operating and power is not being supplied from the solar cell 23, the secondary battery 19 supplies power as Vcc via the DC-DC converter 22. By giving priority to power supply in this way, stable power supply from Vcc is always performed.

The microcomputer 17 comprises an 8-bit one-chip microcomputer operable with very low power consumption.
This microcomputer has built-in clock timer means. The microcomputer 17 exchanges data with the CPU 2 through the serial interface sI / O.

Whether or not the solar cell 23 is supplying power is detected by detecting the voltage with a voltage detection circuit 27. When the voltage is higher than 2.5 V, OUT of the voltage detection circuit 27 When the voltage is at H (High) level and the voltage is 2.5 V or less, OUT at 27 is at L (Low) level. The output from OUT of the voltage detection circuit 27 is input to IN8 of the microcomputer 17.

The voltage in the discharged state of the secondary battery 19 is detected by the voltage detection circuit 24. When the voltage is higher than 1.2V, OUT of the voltage detection circuit 24 becomes H level. OUT of the detection circuit 24 becomes L level. The output from OUT of the voltage detection circuit 24 is input to IN9 of the microcomputer 17.

The voltage of the secondary battery 19 in the fully charged state is detected by the voltage detection circuit 28. When the voltage is higher than 4.8V, OUT of the voltage detection circuit 28 becomes H level and when the voltage is 4.8V or less, OUT of the voltage detection circuit 28 becomes L level. The output from OUT of the voltage detection circuit 28 is input to IN13 of the microcomputer 17.

The DC-DC converter 22 operates as a series regulator when the input voltage is higher than the output voltage.
It operates as a step-up switching regulator and a series regulator when the input voltage is lower than the output voltage.
The output voltage of the DC-DC converter 22 is 5 V or 3 V
5V is output when the input port SEL is at the H level, and 3V is output when the input port SEL is at the L level. The DC-DC converter 22 has its input Vin
Is 0.9 V or more, 5 V or 3 from the output Vout
V is always output.

The microcomputer 17 uses the detection result of the voltage detection circuit 18 for resetting. The voltage detection circuit 18 is a voltage detection circuit for resetting the microcomputer 17,
The output RE is input to RESET of the microcomputer 17. When the voltage of Vout of the DC-DC converter 22 is 2.
When the voltage is 7 V or less, RE of the voltage detection circuit 18 is at the L level. When the voltage of Vout of the DC-DC converter 22 becomes larger than 2.7 V, the RE of the voltage detection circuit 18 delays by the time required for resetting the microcomputer 17 and sets L
Level after the microcomputer 17 is reset.
Level.

The microcomputer 17 operates the pictogram LC on the display unit 14.
D25 and the key matrix circuit 26 of the operation unit 13 are controlled.

The key matrix circuit 26 scans various keys in the operation unit 13 (identifies pressed keys).
The key pressed by software control of the microcomputer 17 is identified. The key matrix circuit 26 includes a document detection switch 30 and a hooking switch 31.

The document detection switch 30 is a mechanical document detection switch (or reed switch) provided on the document conveyance path. By using this mechanical document detection switch, power consumption is eliminated when the switch is turned off (during standby for document insertion), and power consumption of the secondary battery can be prevented.

The hooking switch 31 is a switch for performing off-hook or on-hook.

Next, the schematic configuration of the main power supply 16 will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 is a circuit diagram showing a schematic configuration of the main power supply.

As shown in FIG. 3, the main power supply 16 has an insulating transformer 39 to which AC power is supplied through a filter circuit 40, a rectifier circuit 41, and a smoothing circuit 42. The insulating transformer 39 includes a primary winding 36, an auxiliary winding 37, and a secondary winding 38. The voltage application to the primary winding 36 and the voltage application to the auxiliary winding 37 are switched by the FET 43. The voltage induced in the secondary winding 38 of the insulating transformer 39 is increased by +24 through the rectifying / smoothing circuits 52 and 53.
V and +5 V are supplied to each part of the facsimile apparatus 1 as power.

The gate of the FET 43 is connected to OUT1 of the control IC 44 via the resistor 47, and the operation of the FET 43 is controlled by the control IC 44.

The current from the rectification / smoothing circuit 52 is detected by a current detection circuit 54, and the output from the current detection circuit 54 is fed back to the control IC 44 via a photocoupler 56.

The voltage from the rectification / smoothing circuit 53 is detected by the overvoltage detection circuit 55, and the output of the overvoltage detection circuit 55 is fed back to the control IC 44 via the photocoupler 57.

The P from the microcomputer 17 of the main power controller 15
The S signal (pwON) is a resistor 5 for limiting the current.
1, input to the control IC 44 via the transistor 46 and the photocoupler 45.

The control IC 44 controls the oscillation of the primary side of the insulating transformer 39, and the power supply Vdd is
Nine auxiliary windings 37. The control IC 44
Performs PWM control using the current on the secondary side, and performs control for shutting down the entire system when an overvoltage is detected. OUT1 of the control IC 44 is connected to one end of the primary winding 36 via a resistor 50.

When the PS signal is at the H level, the transistor 46 turns on, a current flows through the photocoupler 45,
The photocoupler 45 performs current-voltage conversion. The light emitting part of the photocoupler 45 is connected to the voltage Vcc via the resistor 49, and the light receiving part is connected to the auxiliary winding 37 via the resistor. In accordance with the operation of the photocoupler 45, the control IC 4
The input port IN1 of the control IC 44 goes low, and the output port OUT1 of the control IC 44 oscillates accordingly. The oscillation signal from the output port OUT1 is fed to the FET via the resistor 47.
The FET 43 performs a switching operation. The primary side oscillates by the switching operation of the FET 43, and power is supplied to the secondary side. The main power supply 16 rises by the power supply to the secondary side, and starts its operation.

When the PS signal is at the L level, the transistor 46 turns off, and IN1 of the control IC 44 goes to the H level. The control IC 4 according to the H level of IN1
4 is at the L level, and the FET 43
Operates off. Oscillation on the primary side is stopped by the OFF operation of the FET 43, and the main power supply 16 stops operating. For example, when the hooking switch 31 (shown in FIG. 2) is pressed during standby, an ON signal is output from the key matrix circuit 26, and the microcomputer 17 recognizes the pressing of the hooking switch 31 and sets OUT5 to the H level, that is, the PS signal. To the H level to activate the main power supply 16. The activation information of the main power supply 16 is transmitted through the serial interface sI /
The facsimile machine 1 is sent to the CPU 2 through O, and the CPU 2 controls the NCU 10 so that the facsimile machine 1 goes off-hook.

Next, the configuration of the CPU 2 and its peripheral circuits will be described with reference to FIG. FIG. 4 is a diagram showing a CPU used in the facsimile apparatus of FIG. 1 and its peripheral circuit configuration.

For the reset operation of the CPU 2, a voltage detection circuit 60 is used as shown in FIG. The voltage detection circuit 60 is a circuit for resetting the CPU 2,
The output RE is input to RESET of CPU2. When the voltage from the main power supply 16 is 4.5 V or less, the output level of RE of the voltage detection circuit 60 is at L level. On the other hand, when the voltage from the main power supply 16 becomes higher than 4.5 V, the output level of the RE of the voltage detection circuit 60 is maintained at the L level by delaying the time required for resetting the CPU 2 and after the CPU 2 is reset. It becomes H level. The output from the RE is also input to the IN 10 of the microcomputer 17 and monitored.

The CPU 2 includes a real-time clock unit 63
Read the exact time from. Real-time clock section 6
Reference numeral 3 includes a primary battery 62 independent of the main power supply 16 and a real-time clock 61 driven by electric power from the primary battery 62 and measuring an accurate time.

Next, a partial circuit configuration of the NCU 10 will be described with reference to FIG. FIG. 5 is a diagram showing a circuit configuration of a part of the NCU used in the facsimile apparatus of FIG.

As shown in FIG. 5, the NCU 10 has a light emitting unit connected to the telephone line 11 via the modular jack 34, a light receiving unit connected to the voltage Vcc via a resistor 58, and a light emitting unit. Unit is connected to the telephone 12 via a modular jack 35, and the light receiving unit is connected to a resistor 5
9, the photocoupler 3 connected to the voltage Vcc
And 3.

The photocoupler 32 outputs a calling signal (CI signal).
This photocoupler 32 receives a call signal through the telephone line 11 when a call signal is received.
It operates so that the incoming signal (L level) is input to IN12 of the microcomputer 17. When a call signal is received during standby, an incoming signal (L level) is input to the microcomputer 17, and the microcomputer 17 recognizes the signal and activates the main power supply 16 by setting OUT5 to the H level, that is, setting the PS signal to the H level. The activation information of the main power supply 16 is sent to the CPU 2 through the serial interface sI / O, and the CPU 2 controls each block according to the information.

The photocoupler 33 is a photocoupler for detecting the off-hook of the telephone set 12. The photocoupler 33 operates so that the L level is inputted to IN11 of the microcomputer 17 when the telephone set 12 is off-hook. I do. When the telephone 12 is off-hook during standby, the L level is input to the microcomputer 17 and the microcomputer 17
Recognizes this, sets OUT5 to the H level, that is, sets the PS signal to the H level, and activates the main power supply 16. The activation information of the main power supply 16 is transmitted through the serial interface sI / O.
To the CPU 2, and the CPU 2 controls each block according to the information.

Next, the operation of the facsimile apparatus of this embodiment will be described with reference to the drawings.

First, the operation in the standby state will be described with reference to FIG. FIG. 6 is a flowchart showing the operation of the facsimile apparatus of FIG. 1 in the FAX standby state.

The AC input is started (step S10)
1), the main power supply 16 is first activated (step S).
102). Next, initialization of the microcomputer 17 (step S103) and initialization of the CPU 2 (step S104) are sequentially performed. When the initialization of the microcomputer 17 is completed, the facsimile machine 1 enters the standby state.

After the initialization of the CPU 2 is completed, charging of the secondary battery 19 is started (step S105), and charging of the secondary battery 19 is continued in a standby state.

Next, it is determined whether or not the charging of the secondary battery 19 has been completed based on the output of the voltage detection circuit 28 and the charging duration (step S106).

It is determined that the charging is completed when the output of the voltage detection circuit 28 is at the H level or when the microcomputer 1
The charging is performed when one hour has elapsed, as measured by the clock timer means incorporated in the timer 7.

In the former case, IN13 of the microcomputer 17 is H
Level, so that the microcomputer 17
5, that is, the operation of the main power supply 16 is stopped by setting the PS signal to the L level (step S107). When the operation of the main power supply 16 is stopped, the RE of the voltage detection circuit 60 becomes the L level, and the CPU 2 is reset (step S107). Step S1
08). Next, power supply by only the secondary battery 19 and the solar battery 23 is started (step S109).

In the latter case, an interrupt is generated, and the microcomputer 17 stops the operation of the main power supply 16 by setting OUT5, that is, the PS signal to the L level (step S107). When the operation of the main power supply 16 is stopped, RE of the voltage detection circuit 60 becomes L level, and the CPU 2
Is reset (step S108). Next, power supply by the secondary battery 19 and the solar battery 23 is started.

After the start of power supply from the secondary battery 19 and the solar battery 23, the secondary battery 19 is charged with surplus power of the power supplied by the solar battery 23 (step S11).
0).

Next, when the potential of the solar cell 23 is
9 is determined (step S).
111). When the potential of the solar battery 23 is lower than the potential of the secondary battery 19 due to a decrease in the power supplied to the solar battery 23, it is determined whether or not the voltage of the secondary battery 19 is 1.2 V or less (step S112). Due to the decrease in the power supplied to the solar cell 23, its potential becomes lower than the potential of the secondary battery, and the secondary battery 1
When the voltage of No. 9 becomes 1.2 V or less, the level of OUT of the voltage detection circuit 24 becomes L level and the level of IN9 of the microcomputer 17 becomes L level. Accordingly, the microcomputer 17 sets OUT5 to H level, that is, PS
The signal is set to H level. The transistor 46 is turned on by the H-level PS signal, the photocoupler 45 is turned on, and IN1 of the control IC 44 becomes L level. When the level of IN1 becomes L level, the control IC
OUT1 of 44 oscillates, and 1
The secondary oscillates and power is supplied to the secondary. The main power supply 16 starts up by supplying power to the secondary side (step S
113). When the main power supply 16 rises, the voltage detection circuit 6
At 0, the CPU 2 is initialized and charging of the secondary battery 19 by the main power supply 16 is started. Therefore, the secondary battery 19 is charged again while the fax standby state is maintained, and this cycle is repeated.

Next, the FA in the FAX standby state
An interrupt routine at the time of X transmission will be described with reference to FIG. FIG. 7 shows the FA in the FAX standby state.
9 is a flowchart illustrating an interrupt routine at the time of X transmission.

When a document is inserted in the FAX standby state (step S201), when the hooking button is pressed (step S202), or when the handset is off-hook (step S203), the document detection switch 30, the hooking switch 31 , Photo coupler 33
Are turned on, the respective ON signals or document detection signals are input to the microcomputer 17, and an interrupt is started (step S204). The microcomputer 17 sets the OUT5 to the H level, that is, sets the PS signal to the H level, and turns on the photocoupler 45. When the photocoupler 45 is turned on, the control IC 44 oscillates the primary side via the FET 43 and supplies electric power to the secondary side, so that the main power supply 1
6 rises (step S205).

When the main power supply 16 starts up, the secondary battery 19
Is started (step S206), and the secondary battery 19 is constantly charged during the operation of the main power supply 16. Main power supply 1
6 is sent to the CPU 2 through the serial interface sI / O, and thereafter the operation control of the facsimile apparatus 1 is performed mainly by the CPU 2. In this state, a call is made to the partner device (step S207), and when the line is captured (step S208), normal facsimile transmission is performed (step S209). When transmission is completed (step S210), the line is disconnected (step S210).
211), the information is sent to the microcomputer 17 through the serial interface sI / O, and the microcomputer 17 stops the operation of the main power supply 16 by setting the PS signal to the L level (step S212). Next, the charging of the secondary battery 19 is terminated (step S213), and the interruption is terminated (step S214). After the interrupt ends, F
The AX standby state is entered, and the process proceeds to step S109
Returning to FIG.

Next, the FA in the FAX standby state
An interrupt routine at the time of X reception will be described with reference to the drawings. FIG. 8 shows the fax in the fax standby state.
9 is a flowchart illustrating an interrupt routine at the time of reception.

When the hooking button is pressed in the FAX standby state (step S301) or when the receiver is hooked off (step S302), the hooking switch 31 and the photocoupler 33 are turned on, and the respective ON signals are output from the microcomputer 17 Is input to
An interrupt is started (step S304).

At the start of the interrupt, the microcomputer 17
5 is set to the H level, that is, the PS signal is set to the H level, whereby the photocoupler 45 is turned on. When the photocoupler 45 is turned on, the control IC 44 oscillates the primary side via the FET 43, power is supplied to the secondary side, and the main power supply 16 rises.

On the other hand, when a calling signal (CI signal) is detected (step S303), the photocoupler 32 is turned on, and an interrupt is started by inputting the ON signal to the microcomputer 17 (step S303). Step S31
6). At the start of the interrupt, the microcomputer 17 sets OUT5 to H
The photo coupler 45 is turned on by setting the level, that is, the PS signal to the H level. Photo coupler 4
When 5 is turned on, the control IC 44 oscillates the primary side via the FET 43 and power is supplied to the secondary side. The power supply to the secondary side causes the main power supply 16 to rise (step S317).

When the hooking button is pressed in the fax standby state (step S301), when the receiver is off-hook (step S302), or when a calling signal is detected (step S303), the main power supply 16 is turned off.
The charging of the secondary battery 19 is started with the rise of the power supply, and the secondary battery 19 is constantly charged during the operation of the main power supply 16. Next, this information is transmitted to the serial interface
The data is sent to the CPU 2 via / O, and thereafter, the operation of the facsimile apparatus 1 is controlled mainly by the CPU 2.

When the hooking button is pressed or the receiver goes off-hook, a call is made to the other party's FAX (step S307), and when the line is captured by the NCU 10 (step S308), normal facsimile reception is performed. (Step S309).

When a call signal is detected, the NCU 10 captures the line and performs facsimile reception by automatic reception (step S309).

When the reception is completed and the line is disconnected (step S310), the information is sent to the microcomputer 17 through the serial interface sI / O, and the microcomputer 17 sets the PS signal to the L level so that the operation of the main power supply 16 is performed. The operation is stopped (step S312).

Next, the charging of the secondary battery 19 is terminated (step S313), and the interruption is terminated (step S314). After the interruption ends, the facsimile standby state is set (step S315), and the process returns to step S109.

Next, an interrupt routine for time correction in the FAX standby state will be described with reference to FIG. FIG. 9 is a flowchart showing an interrupt routine for time correction in the FAX standby state.

In the FAX standby state, the main power supply 16
Is stopped, as shown in FIG. 9, the time is measured by the clock timer means of the microcomputer 17, and the measured time is displayed on the pictogram LCD 25 (step S401).

While the time is being displayed, whether the main power supply 16 has been activated is monitored (step S402). When the main power supply 16 is started for some reason, an interrupt is started (step S403). First, the time displayed on the pictographic LCD 25 is corrected (step S404). In this time correction, the CPU 2 sets the real-time clock (RT
C) The correct time is read by accessing 61 and this time information is read from the serial interface sI /
The microcomputer 17 sends the time information to the microcomputer 17 through O to perform time correction control for correcting the time displayed on the pictogram LCD 25 based on the time information, and stores the time information in a RAM built in the microcomputer 17.

Next, the time read from the real-time clock 61 is displayed on the pictograph LCD 25 (step S405).

During the display of the time read from the real-time clock 61, the operation stop of the main power supply 16 is monitored (step S406). When the operation of the main power supply 16 is stopped, the interruption ends, and the time measured by the clock timer means of the microcomputer 17 is displayed on the pictogram LCD 25 again.

As described above, at the time of transition from the standby state to the operating state, the time of the clock timer means of the microcomputer 17 displayed at the time of standby is corrected based on the accurate time read from the real-time clock 61. Almost accurate time can be displayed.

Further, since the CPU 2 accesses the real-time clock, the exchange of data between the CPU 2 and the microcomputer 17 becomes easy, and
Since the construction system of No. 7 is small, the cost can be easily reduced.

Further, since the accurate time is stored in the RAM of the microcomputer 17, it is possible to display a substantially accurate time when the operation mode shifts to the standby mode.

Further, the voltage supplied from the main power supply control unit 15 to the microcomputer 17 is kept constant by the DC-DC converter 22 irrespective of the state of charge of the secondary battery 19, so that the microcomputer 17 can operate at a wide operating voltage. There is no need to type.

Further, by setting the output voltage of the DC-DC converter 22 to be low, the power consumption of the main power supply control unit 15 can be reduced, and the unnecessary consumption of power of the secondary battery 19 can be suppressed. .

Further, the charging start voltage of the secondary battery 19 can be set to a voltage lower than the minimum voltage at which the microcomputer 17 can operate, and the capacity of the secondary battery 19 can be fully utilized. As a result, the discharge cycle can be lengthened, and the frequency of charging can be suppressed.

[0106]

As described above, according to the power supply device of the first aspect, there is provided a main power supply for supplying AC power from the outside and supplying power to each means of the facsimile apparatus, and a timer, A main power control means for controlling on / off of the main power, a battery for supplying power to the main power control means when the main power is off, and a first display unit comprising:
Displaying time using a second display unit that can be controlled independently
And a second display means, wherein the main power supply control means
When off, the time measured by the timer
Is controlled by the display means of
That accurate time can be displayed regardless of the status of
In both cases, battery consumption when main power is off can be reduced
It works.

According to the power supply device of the second aspect, since the battery includes the secondary battery which can be charged by the main power source, the secondary battery can be used many times by charging, and the trouble of replacing the battery can be reduced. Can be omitted.

According to the power supply device of the third aspect, since the battery includes a solar cell, power consumption from the external AC power supply can be suppressed.

According to the power supply device described in claims 5 to 7, the battery includes a secondary battery and a solar cell, and when the solar cell outputs power, the main power supply control means is supplied from the solar cell. When the power is received and the solar cell is not outputting power, the main power control means receives the power supplied from the secondary battery, so that the use of the secondary battery can save the trouble of replacing the battery, By using a solar cell, power consumption from an external AC power supply can be suppressed.

According to the power supply device of the present invention, the main power supply control means turns on the main power supply in response to the input of the start signal or turns on the main power supply so as to charge the secondary battery. , It is possible to prevent the system from being unable to start due to the discharge of the battery.

According to the power supply device of the present invention, the power supply device further includes a voltage detection means for detecting a voltage of the secondary battery by the main power supply, and the main power supply control means operates in accordance with a detection result of the voltage detection means. Since the charging of the secondary battery by the main power source is controlled by turning on and off the power source, the operable time of the main power source control means by the secondary battery can be extended. Claim 1
According to the power supply device described in Item 6, when the main power is on
Based on the time measured by the obtained clock means, the timer
Time correction means for correcting the time measured by the
From the main power on state to the main power off state
Occasionally an almost accurate time can be displayed on the display means.
Wear.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus using an embodiment of a power supply device of the present invention.

FIG. 2 is a circuit diagram schematically showing a configuration of a main power control unit and its peripheral circuits in the facsimile apparatus of FIG.

FIG. 3 is a circuit diagram schematically showing a configuration of a main power supply used in the facsimile apparatus of FIG. 1;

FIG. 4 shows a CP used in the facsimile apparatus of FIG.
FIG. 3 is a diagram illustrating a U and its peripheral circuit configuration.

FIG. 5 shows an NC used in the facsimile apparatus of FIG.
FIG. 3 is a diagram partially showing a circuit configuration of U.

FIG. 6 is a flowchart showing an operation of the facsimile apparatus of FIG. 1 in a facsimile standby state.

FIG. 7 is a flowchart showing an interrupt routine at the time of facsimile transmission in the facsimile apparatus of FIG. 1 in a facsimile standby state.

FIG. 8 is a flowchart showing an interrupt routine at the time of facsimile reception in the facsimile apparatus of FIG. 1 in a facsimile standby state.

9 is a flowchart showing an interrupt routine for time correction in the facsimile apparatus of FIG. 1 in a FAX standby state.

[Brief description of reference numerals]

 2 CPU 10 NCU 13 Operation unit 15 Main power supply control unit 16 Main power supply 17 Microcomputer 18, 24, 27, 28, 60 Voltage detection circuit 19 Secondary battery 22 DC-DC converter 23 Solar cell 26 Key matrix circuit 30 Document detection switch 31 Hooking switch 32, 33, 45 Photocoupler 39 Insulation transformer 43 FET 44 Control IC 61 Real-time clock 62 Primary battery 63 Real-time clock unit

Claims (16)

(57) [Claims] 1. Clock means for measuring time and a first table
A power supply device used in a facsimile machine having first display means for performing various displays using a display unit , comprising: a main power supply for inputting AC power from outside and supplying power to each means of the facsimile machine; , a timer, turn on the main power, the main power supply control means for turning off control, when the main power supply is off, the battery for supplying electric power to said main power supply control means, said main power supply control means Second display means for displaying time using a second display part which can be controlled independently of the first display part, wherein the main power supply control means is provided when the main power supply is off.
The time measured by the timer is displayed on the second display
A power supply device controlled to display by means . 2. The power supply device according to claim 1, wherein the battery includes a secondary battery that can be charged by the main power supply. 3. The power supply device according to claim 1, wherein the battery includes a solar cell. 4. The power supply device according to claim 2, wherein the main power supply charges the secondary battery when the main power supply is on. 5. The battery includes a secondary battery and a solar cell, and when the solar cell outputs power, the main power supply control unit receives the power supplied from the solar cell, and 2. The power supply device according to claim 1, wherein when the battery is not outputting power, the main power control unit receives the power supplied from the secondary battery. 6. The power supply device according to claim 5, wherein said solar cell charges said secondary battery. 7. When the main power is on, the secondary battery is charged by the main power. When the main power is off and the solar cell is not outputting power, the secondary battery is charged. The power supply device according to claim 6, wherein the power supply is charged by the solar cell. 8. The main power supply control means controls the main power supply to be turned on in response to an input of a start signal, or the main power supply to be turned on so as to charge the secondary battery. The power supply device according to claim 2. 9. The power supply device according to claim 8, wherein the activation signal is input to the main power supply control unit from a corresponding unit among the units of the facsimile apparatus. 10. The start signal includes a call signal from a line connected to the facsimile machine, a key input signal from operation means provided in the facsimile machine, and detection of an off-hook of a handset provided in the facsimile machine. The power supply device according to claim 9, wherein the power supply device is any one of signals. 11. The facsimile apparatus has main body control means for controlling each means of the facsimile apparatus, and the main power supply control means turns off the main power supply based on a control signal from the main body control means. Claim 1 characterized by the following:
The power supply as described. 12. The battery includes a secondary battery that can be charged by the main power supply, and the main body control means outputs the control signal to the main power supply control means in response to termination of a communication operation of the facsimile apparatus, The power supply device according to claim 11, wherein the main power supply control unit turns off the main power supply based on the control signal and terminates charging of the secondary battery by the main power supply. 13. A timer unit for measuring a charging time of the secondary battery by the main power supply, wherein the main power supply control unit determines that the charging time measured by the timer unit reaches a predetermined time. 3. The power supply device according to claim 2, wherein the main power supply is turned off to terminate charging of the secondary battery by the main power supply. 14. The power supply apparatus according to claim 1, further comprising voltage detection means for detecting a voltage of the secondary battery by the main power supply, wherein the main power supply control means turns on the main power supply in accordance with a detection result of the voltage detection means. The power supply device according to claim 2, wherein charging of the secondary battery by the main power supply is controlled by turning off the power. 15. The power supply according to claim 1, wherein the main power supply comprises a switching power supply. 16. The apparatus according to claim 1, further comprising time correction means for correcting the time measured by said timer based on the time measured by said clock means obtained when said main power supply is turned on. The power supply device according to 1.