JP2001045198A - Facsimile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device that suppresses a generated heat produced from the power supply device in an excellent way and minimizes the energy consumed by a fixed output type regulator. SOLUTION: After starting copy processing, a MODEM is switched to a sleep mode (S1), and in the case that a call signal from an external communication line is detected (YES: S9) during copy execution (NO: S3) and a communication priority mode is set (YES: S11), the sleep mode of the MODEM is released (S13) and communication with the external communication line is attained (S15).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a copy function, and connects an AC power supply to a primary side of a transformer.
The present invention relates to a facsimile device having a power supply device that generates a DC voltage on the secondary side of a transformer, and more particularly to a facsimile device capable of favorably suppressing heat generated from a fixed output voltage regulator when a copy function is performed. is there.

[0002]

2. Description of the Related Art Conventionally, various electronic devices such as facsimile machines have been provided with a power supply device for connecting an AC power supply to a primary side of a transformer and generating a desired DC voltage at a secondary side of the transformer. Various types of power supply devices have been proposed according to their uses.

FIG. 4 is a schematic configuration diagram showing an example of the above-described power supply device. As shown in FIG. 4, this power supply device 71 includes a filter circuit 76, a rectifier circuit 77, a smoothing circuit 78, and a switch 79. , A primary side 72 including a primary winding 83, and a secondary side 7 including a detector 80, a fixed output voltage regulator 81, a secondary winding 84, and the like.
4 is a power supply device using a switching system consisting of: an AC voltage supplied from an AC power supply 73;
The first and second DC voltages necessary for driving the electronic device 75 are output by converting the DC voltage through the second and secondary sides 74.

In the power supply device 71 configured as described above, a DC voltage value obtained from a winding ratio between the primary winding 83 and the secondary winding 84 is detected by the detector 80, and based on the detection result, , The primary side 7 via the feedback control circuit 82.
By controlling ON / OFF of the switch 79 provided in the electronic device 75, a stable first DC voltage is always supplied to the electronic device 75.
It is configured to supply to Also, the power supply 7
Reference numeral 1 denotes an unstable DC voltage that fluctuates in accordance with a load current applied to the first DC voltage based on a winding ratio obtained from a connection position with respect to the secondary winding 84, By converting a potential difference between the stable DC voltage and the second DC voltage into heat energy or the like, a stable second DC voltage is always supplied to the electronic device 75. The unstable DC voltage fluctuates in accordance with the amount of energy applied to the secondary winding 84, and the increase in the amount of energy applied to the secondary winding 84 caused by the increase in the load current applied to the first DC voltage becomes unstable. The configuration is such that the DC voltage is increased.

[0005]

However, in the power supply device 71 having the above-described configuration, in the fixed output voltage regulator 81, the potential difference (V) between the unstable DC voltage on the input side and the second DC voltage on the output side is equal to the potential difference (V). Since a desired DC voltage value is obtained by converting the power (W) obtained by multiplying the DC current value (I) applied to the fixed output voltage type regulator 81 into heat energy or the like, the fixed output voltage type regulator 81 There is a problem that it is not suitable for energy saving if the power supply device 71 becomes high temperature due to the heat generation of 81 or increases the energy consumption by converting it into heat energy. In addition, these problems occur, particularly when the unstable DC voltage increases due to an increase in the amount of energy applied to the secondary winding 84 due to an increase in the load current applied to the first DC voltage.
These phenomena have become more serious, and these phenomena have been conspicuous when supplying a large amount of power to the electronic device 75 described above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to provide a power supply device capable of satisfactorily suppressing heat generated by the power supply device and minimizing energy wasted by a fixed output voltage regulator. It is an object of the present invention to provide a facsimile apparatus having the same.

[0007]

According to a first aspect of the present invention, there is provided a facsimile apparatus capable of communicating with an external communication line and simultaneously operating a scanner function and a printer function. In a facsimile apparatus capable of performing the following, an AC power supply is connected to the primary side of the transformer, and a primary winding and a secondary winding of the transformer are used to generate a stable DC voltage at the secondary side of the transformer. A first DC voltage generator that generates a stable first DC voltage based on a turn ratio of the first DC voltage generator and a fixed DC voltage that fluctuates according to a load current applied to the first DC voltage generator, and is fixed. A second DC voltage generator for generating a stable second DC voltage via an output voltage regulator; a power supply having two DC voltage generators; and a scanner function for the copy function When the printer function and the printer function operate simultaneously using the first DC voltage by the first current voltage generator, the second DC voltage generator supplies power to a circuit that operates using the second DC voltage. And a load current reducing means for reducing the load current applied to the second DC voltage generating section.

According to this facsimile apparatus, when the power supply unit includes the first DC voltage generation unit and the second DC voltage generation unit, and executes the copy function for simultaneously operating the scanner function and the printer function. , The first DC voltage generated by the first DC voltage generator is used. At this time, the load current applied to the first DC voltage generator increases, but the load current reducing unit does not supply power to the circuit that operates using the second DC voltage by the second DC voltage generator. Therefore, the load current applied to the second DC voltage generator can be reduced. As a result, the DC voltage value applied to the fixed output voltage type regulator is reduced, the amount of energy to be lost in the fixed output voltage type regulator is reliably reduced, and it is possible to suppress heat generation satisfactorily, It is suitable for energy saving because consumption is reduced.

According to a second aspect of the present invention, in the facsimile apparatus according to the first aspect, the load current reducing means operates using a second DC voltage generated by the second DC voltage generator. It is characterized in that power supply to a circuit necessary for communication with the device is not performed.

According to this configuration, when the copy function is performed, the load current reducing unit does not supply power to a circuit necessary for communication with the external communication line, so that the load on the second DC voltage generation unit is reduced. Since the load current is reduced, the load current required for a circuit that is not related to the operation of the copy function is reduced, and the copy function can be reliably executed and the load current applied to the second DC voltage generator can be reduced. ,
Very convenient.

According to a third aspect of the present invention, in the facsimile apparatus according to the first or second aspect, the second DC voltage generator supplies power to a communication system and a control system such as a CPU and a modem, and The current reducing means reduces a load current required for the operation of the modem.

According to this configuration, when the copy function is executed, the load current reducing means operates the load current required for the operation of the modem in the communication system and the control system receiving the power supply from the second DC voltage generator. Is reduced and the sleep state is set, so that the modem does not supply power to the circuits necessary for communication with the external communication line, so that the load current applied to the second DC voltage generator can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a control unit provided in the facsimile apparatus of the present invention. As shown in FIG. 1, the facsimile apparatus 29 includes a central control unit (CP) via a bus line 1.
U) 2, ROM 3, reading unit 4, recording unit 5, RAM 6, nonvolatile RAM 7, character generator (CG)
8, an operation unit 9, a display unit 10, a modem 11, a network control unit (NCU) 12, and a power supply unit 27 are connected to each other.

The CPU 2 used in the facsimile apparatus 29 having such a configuration is constituted by a microprocessor or the like, and based on a predetermined arithmetic program recorded in the ROM 3, the above-mentioned components such as the reading section 4, the recording section 5, and the like. Controlling.

The reading unit 4 includes a DMA controller,
It is composed of an image processing IC, an image sensor such as a contact sensor (CS), a CMOS logic IC, etc., binarizes data read by the image sensor under the control of the CPU 2, and stores the binarized data in the RAM 6 sequentially. ing. The recording unit 5 includes a DMA controller, an ink jet recording device, a CMOS logic IC, and the like, extracts recording data stored in the RAM 6, and performs recording and output as a hard copy.

The RAM 6 stores the binary data read by the reading unit 4, the binary data demodulated through the NCU 12 and the modem 11, the binary data recorded in the recording unit 5, and the external communication line 13. And stores the binarized data to be output.

The nonvolatile RAM 7 stores the facsimile device 2
Even when the input of the AC power supply 25 to the power supply 9 is cut off, desired data to be stored such as a speed dial is stored. CG8 is a ROM for storing characters such as JIS code and ASCII code in advance.
The character data corresponding to the predetermined code is output as 2-byte data as needed based on the control of the above.

The operation unit 9 includes a start key (not shown) for starting transmission and reception of images,
A mode selection key (not shown) for designating an operation mode such as standard or automatic reception, a ten-key for dialing and a one-touch key (not shown), and whether or not to put the modem 11 into the sleep mode during copying can be set. It has a modem setting key 26 and the like. The display unit 10 includes a liquid crystal display (not shown) for displaying the state and operation of the facsimile machine 29 and the like.

The modem 11 modulates the transmission data stored in the RAM 6 under the control of the CPU 2, and modulates the NCU.
The data is output to the external communication line 13 via the external communication line 12 or the analog signal from the external communication line 13 is modulated into predetermined binary data via the NCU 12 and stored in the RAM 6.

The power supply unit 27 converts an alternating current from the alternating current power supply 25 into a direct current through a switching system, and supplies power to each of the above-described blocks. The DC voltage supplied from the power supply unit 27 to each block is a + 5V DC voltage and a + 24V DC voltage, and the + 5V DC voltage is mainly the CP voltage.
U2 and modem 11 are supplied to communication and control system blocks.
And a drive unit block such as the recording unit 5.

FIG. 2 is a schematic diagram showing the power supply configuration of the power supply unit 27. As shown in FIG. 2, the +5 V DC voltage and the +24 V DC voltage required for driving the main part 31 of the facsimile apparatus. Is supplied from an AC power supply 25 via a power supply unit 27.

The power supply unit 27 uses a switching method as a method of converting an AC current to a DC current.
A primary side 4 including a filter circuit 33, a rectifier circuit 35, a smoothing circuit 37, a switch 39, a primary side winding 46, and the like.
1, a fixed output voltage regulator 43, a detector 50,
A desired DC voltage is output to the facsimile main unit 31 side by a secondary side 45 including a secondary winding 47 and the like.

The +24 V DC voltage is applied to the primary winding 4
The DC voltage value obtained from the turns ratio between the secondary winding 6 and the secondary winding 47 is detected by the detector 50, and based on the detection result,
ON / OFF of a switch 39 provided on the primary side 41 is controlled via a feedback control circuit 49, whereby a constantly stable + 24V DC voltage is supplied to a drive system block of the main part 31 of the facsimile apparatus. Configuration. In addition, fixed output voltage regulator 4
3 is based on a winding ratio determined from a connection position with respect to the secondary winding 47, and after inputting an unstable DC voltage of + 6V to + 9V which fluctuates according to a load current applied to a + 24V DC voltage, The difference in electric power (W) obtained by multiplying the potential difference (V) between the voltage and the +5 V DC voltage supplied to the communication / control system block of the facsimile main part 31 by the load current (I) applied to the +5 V DC voltage, , A stable +5 V DC voltage is output. The unstable DC voltage of + 6V to + 9V increases as the load current applied to the + 24V DC voltage increases. Such an increase in unstable DC voltage
A facsimile having many functions such as a facsimile function, a copy function, a telephone function, a scanner function, and a printer function occurs when the load current applied to the +24 V DC voltage increases and the amount of energy applied to the secondary winding 47 increases. Among the functions of the apparatus 29, the above-described function is particularly prominent when executing a copy function that simultaneously uses a scanner function and a printer function.

Next, the operation for executing the copy process will be described in detail with reference to FIG. Through the operation unit 9,
When the execution of the copy processing is instructed, first, the modem 11 to which the +5 V DC voltage is supplied is switched to the sleep state (S1). By putting the modem 11 into the sleep state, the modem 11 does not supply power to circuits necessary for communication with the external communication line 13, and the load current applied to the + 5V DC voltage is reduced. .

Next, it is confirmed whether or not copying has been completed (S
3) If it has not been completed (S3: NO), it is checked whether or not a call signal from the external communication line 13 has been detected via the NCU 12 (S9). Here, external communication line 1
3 is not detected (S9: N
O) Until the copy is completed (S3: YES), S3 and S
Step 9 is repeated.

When a call signal from the external communication line 13 is detected (S9: YES), it is confirmed whether or not the communication priority mode is set by the modem setting key 26 provided on the operation unit 9 (S11). If the mode is not the communication priority mode (S11: NO), the process proceeds to S3. Note that the communication priority mode is a mode in which communication with the external communication line 13 is enabled even during the execution of the copy process. When a call signal from the external communication line 13 is detected during the execution of the copy process, the communication priority mode is set. By releasing the sleep mode 11, communication with the external communication line 13 is enabled.

On the other hand, when the communication priority mode has been set in advance via the modem setting key 26 provided on the operation unit 9 (S11: YES), the sleep mode of the modem 11 is released (S13). Then, communication with the external communication line 13 is enabled, and FAX data from the external communication line 13 is received in the memory, or a telephone call is started (S15). This FAX memory reception processing or telephone call processing (S15) is performed in parallel with the copy processing (S3).

When all copying is completed, (S
3: YES), after releasing the modem sleep (S5),
During the execution of the copy (S3: NO), it is confirmed whether the FAX memory reception has been performed (S7). Here, during copying, the FA
If X memory reception has been performed (S7: YES), F
After the data received by the AX memory is printed out (S17), the copy processing ends. On the other hand, during copying,
If X memory reception has not been performed (S7: NO), the copy processing is terminated as it is. When the data received from the facsimile memory is being output (S17), even if a call signal from the external communication line 13 is detected, after the copy is completed (S17).
3: YES), the modem sleep is released (S5), so that there is no hindrance to communication functions such as a telephone function and a FAX function, which is very convenient.

As described above, when the copy process is being executed, the modem 11 is switched to the sleep state and power is not supplied to the circuits necessary for communication with the external communication line 13, so that a + 5V DC voltage is applied. The load current can be satisfactorily reduced, the amount of energy to be consumed by the fixed output voltage regulator 43 is reduced, heat generation of the fixed output regulator 43 is suppressed, and wasteful energy consumption can be prevented. I have.

Further, the load current applied to the + 5V DC voltage is reduced by sleeping the modem 11 during the execution of the copy function in which the load current applied to the + 24V DC voltage is large. Can be suppressed.

Further, the modem 1 not used for the copy function
Since the load current required for the operation 1 is reduced, heat generation of the fixed output voltage regulator 43 can be suppressed without impairing the copy function, which is very convenient.

During execution of the copy function, the external communication line 1
When the call signal from the modem 3 is detected, the sleep mode of the modem 11 can be released based on the setting of the modem setting key 26 of the operation unit 9, so that the communication with the external communication line 13 is performed during the copy. There is no inconvenience that it cannot be done, and it is very convenient.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, an example has been given in which the modem 11 is switched to the sleep mode when the copy function is executed. However, the present invention is not limited to this.
It is needless to say that a good effect can be obtained by measuring the DC voltage value of the unstable DC voltage input to the modem 11 and switching the modem 11 to the sleep mode when the DC voltage value exceeds the predetermined DC voltage value. .

In this embodiment, an example of a power supply device that outputs +24 V DC voltage and +5 V DC voltage has been described. However, the present invention is not limited to this, and it is possible to use a power supply device having a different DC voltage value. Needless to say, the same effect can be obtained by using the present invention in a power supply device that supplies three or more DC voltages.

[0035]

As described above, according to the facsimile apparatus of the first aspect, the power supply unit is provided with the first DC voltage generation unit and the second DC voltage generation unit, and has a scanner function and a printer. When executing the copy function to operate the function at the same time, using the first DC voltage by the first DC voltage generator, at this time, the load current applied to the first DC voltage generator increases, Since the load current reducing unit does not supply power to the circuit that operates using the second DC voltage by the second DC voltage generation unit, it is possible to reduce the load current applied to the second DC voltage generation unit. it can. As a result, the DC voltage value applied to the fixed output voltage type regulator is reduced, the amount of energy to be lost in the fixed output voltage type regulator is reliably reduced, and it is possible to suppress heat generation satisfactorily, It is suitable for energy saving because consumption is reduced.

According to the facsimile apparatus of the second aspect, in addition to the effect of the facsimile apparatus of the first aspect, when the copy function is executed, the load current reducing means is necessary for communication with the external communication line. Since the load current applied to the second DC voltage generator is reduced by not supplying power to the power supply, the load current required for circuits not related to the operation of the copy function is reduced, and the copy function is not performed. And the load current applied to the second DC voltage generator can be reduced, which is very convenient.

According to the facsimile apparatus of the third aspect, when the copy function is executed, the load current reducing means includes:
Since the load current required for the operation of the modem in the communication system and the control system receiving the power supply from the second DC voltage generation unit is reduced and the sleep state is established, the modem is required for communication with the external communication line. Since power is not supplied to the circuit, the load current applied to the second DC voltage generator can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a facsimile apparatus provided with a power supply device according to an embodiment.

FIG. 2 is a schematic diagram illustrating a power supply configuration of a power supply unit.

FIG. 3 is a flowchart illustrating an operation of a copy process.

FIG. 4 is a block diagram of a power supply device.

[Explanation of symbols]

 4 Reading unit 5 Recording unit 11 Modem 12 NCU 13 External communication line 25 AC power supply 26 Modem setting key 27 Power supply unit 29 Facsimile device 39 Switch 41 Primary side 43 Fixed output voltage regulator 45 Secondary side 46 Primary side winding 47 Secondary Side winding 49 Feedback control circuit 50 Detector

Claims (3)

[Claims] 1. A facsimile apparatus capable of performing communication with an external communication line and executing a copy function for simultaneously operating a scanner function and a printer function. In order to generate a stable DC voltage on the secondary side of
A first DC voltage generator for generating a stable first DC voltage based on a winding ratio between a primary winding and a secondary winding of the transformer, and a first DC voltage generator. Using a non-stable DC voltage that varies according to the load current, a second DC voltage generator that generates a stable second DC voltage via a fixed output voltage regulator, and a power supply unit having two DC voltage generators, When the scanner function and the printer function operate simultaneously using the first DC voltage by the first current voltage generator for the copy function, the second DC voltage is used by the second DC voltage generator. A facsimile apparatus comprising: a load current reducing unit configured to reduce a load current applied to the second DC voltage generating unit by not supplying power to an operating circuit. 2. The load current reducing unit does not supply power to a circuit necessary for communication with an external communication line operated by using a second DC voltage by the second DC voltage generation unit. The facsimile apparatus according to claim 1, wherein: 3. The second DC voltage generator supplies power to a communication system and a control system such as a CPU and a modem, and the load current reducing unit reduces a load current required for operation of the modem. The facsimile apparatus according to claim 1 or 2, wherein