JP2002236528A - Power source controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save unprocessed data in a memory if an AC input voltage drops. SOLUTION: This controller has a secondary voltage generating means which generates a secondary DC voltage according to an AC input voltage, a voltage drop detecting means which detects the AC input voltage dropping, and a data saving function part which has a function of saving data when the drop in the AC input voltage is detected. In this case, if the AC input voltage drops, no remaining electric power is unwittingly consumed, so the electric power which is large enough to save the data can be supplied to the data saving function part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control device.

[0002]

2. Description of the Related Art Conventionally, in an information device, for example, a printer, a power supply control device is provided for detecting a decrease in an AC input voltage which is a power supply voltage, and the power supply control device operates a control system. And a secondary DC voltage supplied to drive a power system such as a motor and a print head.

[0003]

However, in the conventional power supply control device, since the secondary DC voltage is monitored to detect that the AC input voltage has dropped, the unprocessed power supply control device has not been processed. In the case of a printer, for example, in the case of a printer, a process for saving unprinted print data in a memory cannot be performed. Therefore, data such as print data and print mode data already sent to the printer is erased. In that case, turn off the printer
When the power is turned off and then turned on again, it becomes necessary to transmit data from the host device to the printer again from the beginning.

The present invention solves the problems of the conventional power supply control device and provides a power supply control device capable of saving unprocessed data to a memory when the AC input voltage decreases. Aim.

[0005]

For this purpose, in the power supply control device of the present invention, a secondary side voltage generating means for generating a secondary side DC voltage based on an AC input voltage, and detecting a decrease in the AC input voltage. And a data saving function unit that processes data transmitted from a higher-level device and saves data when a decrease in AC input voltage is detected.

[0006]

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

FIG. 1 is a first diagram showing a circuit of a power control device according to a first embodiment of the present invention, and FIG. 2 is a second diagram showing a circuit of the power control device according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a secondary-side power generation circuit according to the first embodiment of the present invention.

In the figure, reference numeral 11 denotes an AC power supply for supplying an AC input voltage, which is a power supply voltage, and 12 denotes a power supply unit. The power supply unit 12 includes a full-wave rectifier circuit 13 and a secondary Side power generation circuit 14, AC low detection circuit 1 as voltage drop detection means for detecting a drop in AC input voltage
5 and a diode bridge DB. The diode bridge DB rectifies the AC input voltage, and the anodes of the diodes D1 and D2 are connected to two AC terminals (-terminals). The secondary power supply generating circuit 14 generates a secondary DC voltage of +5 [V] and a secondary DC voltage of +40 [V] higher than that based on the AC input voltage. Also, a negative terminal (-terminal) of the diode bridge DB.
An electrolytic capacitor CP is connected to the cathodes of the diodes D1 and D2, and the electrolytic capacitor CP smoothes the rectified voltage. The first secondary DC voltage is constituted by the secondary DC voltage of +5 [V], and the second secondary DC voltage is constituted by the secondary DC voltage of +40 [V].

Then, resistors R1 and R2 are connected in series to both ends of the electrolytic capacitor CP, and the resistors R1 and R2 divide the voltage Vcp (t) between the terminals of the electrolytic capacitor CP. The anode of the photocoupler PC is connected to the connection between the resistors R1 and R2, the cathode of the Zener diode ZD1 is connected to the cathode of the photocoupler PC, and the anode of the Zener diode ZD1 is connected to the negative terminal (−) of the diode bridge DB. Terminal).

Further, the cathode of a Zener diode ZD2 is connected to the collector of a diode disposed on the primary side in the photocoupler PC, and the anode of the Zener diode ZD2 is connected to the emitter of the diode in the photocoupler PC. When the transistor arranged on the secondary side is off, the voltage between the collector and the emitter can be kept at a certain level or more.

The cathode of the Zener diode ZD2 is connected to one terminal of a resistor R3 for limiting the current flowing through the photocoupler PC, and the other terminal of the resistor R3 is connected to the base of an NPN transistor TR. . A DC voltage of +40 [V] is applied to the base of the transistor TR via a pull-up resistor R4 to turn on the transistor TR.

Then, a DC voltage of +5 [V] is applied to the collector of the transistor TR via a pull-up resistor R5. The DC voltage of +5 [V] is a signal POWGOOD as a voltage drop detection signal output to the control unit 21.
Used as -N. The emitter in the photocoupler PC, the anode of the Zener diode ZD2, and the emitter of the transistor TR are all connected to 0 [V] potential (the same potential as 0 [V] of the control unit 21).

Next, the secondary power supply generation circuit 14 will be described.

As shown in FIG. 3, the secondary power supply generating circuit 14 includes a primary terminal t connected to the positive terminal (+ terminal) and the negative terminal of the diode bridge DB, respectively.
1, t2 and +5 [V] secondary DC voltage and +4
It has secondary terminals t3 and t4 for outputting a secondary DC voltage of 0 [V]. Further, the secondary-side power supply generation circuit 1
Numeral 4 includes a transformer T, to which an electrolytic capacitor CP11 and a switching circuit 91 are connected to the primary side of the transformer T to generate a secondary DC voltage of +5 [V] on the secondary side of the transformer T. Is connected to a diode D11, an electrolytic capacitor CP12 and a regulator 92,
In order to generate a secondary DC voltage of +40 [V], a diode D12, a coil L and an electrolytic capacitor CP13 are used.
Is connected.

Next, the control section 21 will be described.

The control unit 21 includes NPN transistors TR1 and TR2 as secondary DC voltage distribution means, and an input terminal of the signal POWGOOD-N is connected to the bases of the transistors TR1 and TR2. Also,
+ Generated by the secondary-side power generation circuit 14
Input terminals of +5 [V] and +40 [V] are connected to collectors of the transistors TR1 and TR2, respectively, to supply secondary side DC voltages of 5 [V] and +40 [V]. Resistances R6 and R7 are respectively connected between the base and the collector. The emitters of the transistors TR1 and TR2 are connected to the ground G.
Connected to ND.

The input terminal of +5 [V] is connected to a data processing unit 71 as a control system.
23, ROM 24, LSI 25, D-
+ In RAM 26, S-RAM 27 and EEPROM 28
A secondary DC voltage of 5 [V] is applied. The data processing unit 71 processes data transmitted from a higher-level device (not shown), performs printing in accordance with the data, and
A data saving function unit having a function of saving the data when a decrease in the input voltage is detected.

The CPU 23 controls the entire printer as an information device.
4, an LSI 25, a D-RAM 26, an S-RAM 27, and an EEPROM 28 are connected. A control program for controlling the entire printer is recorded in the ROM 24. The LSI 25 is a D-RAM 26, S
-Control each element such as the RAM 27 and the EEPROM 28 and each mechanism circuit such as the space motor, the print head, and the LF motor. The D-RAM 26 is a volatile memory in which various data such as print data and print mode data are recorded. Each data recorded in the D-RAM 26 disappears when the secondary DC voltage of +5 [V] is not supplied. The S-RAM 27 and the EEPROM 28 are non-volatile memories, in which data such as various mode set data is recorded. SR
Each data recorded in the AM 27 and the EEPROM 28 does not disappear even when the secondary DC voltage of +5 [V] is not supplied.

The emitter of the transistor TR1 is connected to a sensor / display unit 72 as a sensor system.
Photointerrupter 3 constituting sensor / display unit 72
1, +5 for the option detection sensor 32, platen position detection sensor 33, SP motor encoder 34, operator panel LED 35, operator panel switch 36, and sensor monitoring / operator panel control LSI 37
[V] secondary side DC voltage is applied. The photo-interrupter 31 is for detecting the presence or absence of a sheet (not shown).
It is connected to the light emission side of the photo interrupter 31. The sensor / display unit 72 constitutes a first non-data saving function unit having no function of saving data transmitted from the higher-level device.

The input terminal of +40 [V] is connected to the first
Is connected to a driving circuit 73 as a power system, and the space motor driver circuit 41, the print head driver circuit 42 and the LF motor driver circuit 43 constituting the driving circuit section 73 are connected to a secondary DC of +40 [V]. Apply voltage.

The emitter of the transistor TR2 is connected to a driving auxiliary circuit section 74 as a second power system. The stepping motor holding circuit 51 and the solenoid driver circuit 52 constituting the driving auxiliary circuit section 74.
, A secondary DC voltage of +40 [V] is applied. The stepping motor holding circuit 51 is for fixing the position of the stepping motor (not shown) when the rotation of the stepping motor is stopped. The driving auxiliary circuit unit 74 constitutes a second non-data saving function unit that is not driven when the data transmitted from the host device is saved and has no function of saving the data.

Further, an input terminal of a signal POWGOOD-N from the power supply unit 12 is connected to a port of the CPU 23 capable of performing an interrupt process.
Monitor the level of OD-N.

Next, the operation of the power supply control device having the above configuration will be described.

First, in the power supply section 12, when the AC input voltage is normal, the voltage between the terminals of the electrolytic capacitor CP is Vcp (t), and the resistance constants of the resistors R1 and R2 are r1 and r2.
Assuming that r2, the voltage Vr2 between the terminals of the resistor R2 is as follows: Vr2 = Vcp (t) · r2 / (r1 + r2). Normally, the terminal-to-terminal voltage Vr2 is set to the breakdown voltage Vz of the Zener diode ZD1 by the L in the photocoupler PC.
Since the voltage is higher than the voltage obtained by adding the voltage drop Vpcd by the ED, a current flows to the LED in the photocoupler PC, and the transistor in the photocoupler PC is turned on. Therefore, the transistor TR is turned off, and the signal POWGOOD-N
Is high level (+5) by pull-up resistor R5.
[V]).

When the AC input voltage decreases due to a power failure, a momentary interruption, or the like, the voltage Vr2 between the terminals of the resistor R2 becomes lower than the voltage obtained by adding the voltage drop Vpcd to the breakdown voltage Vz. , No current flows, and the transistor in the photocoupler PC is turned off. As a result, the pull-up resistor R
4, a secondary DC voltage of +40 [V] is applied,
The transistor TR is turned on, and the signal POWGOOD-
N goes low. In this manner, the decrease in the AC input voltage is detected, and the control unit 21 is notified of the decrease in the AC input voltage. Note that the decrease in the AC input voltage includes interruption of the AC input voltage.

The breakdown voltage Vz and the resistance constants r1, r2
Is set in advance by a slice voltage that is used to distinguish between a normal time and a fall time of the AC input voltage. Then, the condition that the signal POWGOOD-N becomes low level is Vcp (t) <(r1 + r2) · (Vz + Vpc) / r
2.

By the way, in the control unit 21, the CP
U23 constantly monitors the voltage level of the port where interrupt processing is possible. If the AC input voltage is normal, the signal POWGOOD-N is at the high level.
Reference numeral 3 performs normal control for a printing operation. When the AC input voltage decreases due to a power failure, momentary interruption, or the like, the signal P
OWGOOD-N goes low. Along with this,
The data processing unit 71 sends a predetermined signal to the host device,
The transmission of the data is stopped, and the evacuation processing unit (not shown) of the data processing unit 71 stops all the processing currently being performed and, at the same time, the unprocessed data received from the higher-level device, for example, the unprocessed data among the print data. Print data such as print data and print mode data necessary for control
The data is read from the AM 26, and the data is stored in the S-RAM 27, E
The data is recorded in the EPROM 28 or the like and is evacuated.

Further, for example, in the case of a printer that performs control such as counting the total number of print characters and the total number of line feeds and managing the life of consumables such as cartridges, the evacuation processing means includes the total number of print characters, Data such as the total number of line breaks
23, the S-RAM 27 and the EE
The data is recorded in the PROM 28 or the like and is saved.

Then, the secondary DC voltage of +5 [V] and +40 [V] is not applied to the bases of the transistors TR1 and TR2, and the transistors TR1 and TR2 are turned off. The supply of the secondary side DC voltage of +5 [V] and +40 [V] is stopped.

Therefore, the supply of the secondary DC voltage of +5 [V] to the sensor / display unit 72 and the driving auxiliary circuit unit 74 which are unnecessary for saving the data with the decrease of the AC input voltage. The supply of the secondary DC voltage of +40 [V] is stopped. Accordingly, the photo interrupter 31,
Optional detection sensor 32, platen position detection sensor 3
3. SP motor encoder 34, LED 35, switch 36, and LSI 3 for sensor monitoring and operator panel control
7, a secondary DC voltage of +5 [V], a stepping motor holding circuit 51 and a solenoid driver circuit 52
, The application of the secondary side DC voltage of +40 [V] is forcibly stopped. Such a series of processes is performed until the operation of the data processing unit 71 becomes unstable or stops after the secondary DC voltage of +5 [V] starts to decrease after the decrease of the AC input voltage is detected. Done.

Since it is not preferable that the printing operation is interrupted in a state where printing is not completed for the minimum data unit of the printing data, even after the transistor TR2 is turned off, +40 The supply of the secondary DC voltage [V] is continued, and the space motor driver circuit 41, the print head driver circuit 42, and the LF motor driver circuit 43 are driven to perform printing for the minimum data unit. The driving of the driver circuit 41, the print head driver circuit 42, and the LF motor driver circuit 43 is stopped. Then, brakes (not shown) of the space motor driver circuit 41 and the LF motor driver circuit 43 are braked. These processes are L
This is performed by SI25.

Next, when the power is turned off and then turned on again, the CPU 23 operates in the S-RAM 27, EEPR
It reads out unprocessed data such as unprinted print data and print mode data from the OM 28 or the like, sets a print mode, and performs print processing. Also, the S-RAM 27,
Data such as the total number of print characters and the total number of line feeds is read from the EEPROM 28 or the like, and recorded in the internal memory of the CPU 23.

Therefore, the remaining power generated by the power supply section 12, that is, the remaining power is not unnecessarily consumed, so that the power required to save the data is sufficiently supplied to the data processing section 71. And unprocessed data such as unprinted print data and print mode data can be saved. As a result, when the power is turned off and then turned on again, there is no need to transmit data from the host device to the printer again from the beginning.

When the power is turned off and then turned on again, data such as the total number of print characters and the total number of line feeds can be read out and used for subsequent counting. The life of the consumable can be accurately calculated based on data such as the total number of line feeds.

FIG. 4 is a comparison diagram of the secondary DC voltage of +5 [V] in the first embodiment of the present invention and the secondary DC voltage of +5 [V] in the conventional power supply control device. In the figure, the horizontal axis represents time, and the vertical axis represents secondary DC voltage.

In the drawing, L1 is a line indicating the secondary side DC voltage of +5 [V] in the present embodiment, and L2 is the conventional + 5V.
This is a line indicating a secondary DC voltage of 5 [V]. As shown in the figure, at timing t1, an AC
When the input voltage decreases, the secondary DC voltage is changed to lines L1 and L1.
As shown in FIG. 2, the voltage decreases with the passage of time. However, while the conventional secondary DC voltage rapidly decreases, the secondary DC voltage in the present embodiment gradually decreases.

Next, a second embodiment of the present invention will be described. In addition, about what has the same structure as 1st Embodiment, the description is abbreviate | omitted by attaching the same code | symbol.

FIG. 5 is a diagram showing a circuit of a power supply control device according to the second embodiment of the present invention. In the figure, a diode bridge DB (FIG. 1) in the power supply unit 12
The sensor / display unit 72 (FIG. 2) and the driving auxiliary circuit unit 74 in the control unit 61 are omitted for convenience.

As shown in the drawing, the control section 61 outputs a signal POWGOOD-N as a voltage drop detection signal.
Is supplied to the base of the PNP transistor TR3,
The input terminal of the secondary DC voltage of +40 [V] is connected to the emitter of the transistor TR3,
A resistor R8 is connected between the base and the emitter of No.3. The input terminal of the secondary DC voltage of +5 [V] is connected to the data processing unit 71, and the input terminal of the secondary DC voltage of +40 [V] is connected to the driving circuit unit 73.

Then, a Zener diode Z having a breakdown voltage of +5 [V] is connected to the collector of the transistor TR3.
D3 is connected to the Zener diode ZD.
The third anode is connected to the ground GND. Therefore, when the transistor TR3 is turned on, the voltage generated at the collector becomes the breakdown voltage +5 [V], and is supplied to the data processing unit 71 via the diode D3. For this purpose, the anode of the diode D3 is connected to the cathode of the Zener diode ZD3, and the cathode of the diode D3 is connected to the data processing unit 71 and the input terminal of the secondary DC voltage of +5 [V].

Then, between the emitter of the transistor TR3 and the ground GND, there is connected an electrolytic capacitor CP1 as a storage means.
The power of +40 V secondary-side DC voltage is stored, and the power is released after the power is turned off. The Zener diode ZD3 is connected to the collector of the transistor TR3 by +
The secondary DC voltage of 5 [V] is continuously generated and supplied to the data processing unit 71. At this time, the Zener diode ZD3 constitutes a secondary side DC voltage supply unit.

Next, the operation of the power supply control device having the above configuration will be described. The power supply unit 12 is the same as in the first embodiment, and a description thereof will be omitted.

First, in the power supply section 12, when the AC input voltage is normal, the signal POWGOOD-N is at a high level and the transistor TR3 is turned off, so that the secondary of +5 [V] on the collector side of the transistor TR3 is The side DC voltage and the secondary side DC voltage of +40 [V] on the emitter side are opened. In this state, the secondary DC voltage of +40 [V] is supplied to the driving circuit unit 73, and the secondary DC voltage of +5 [V] is supplied to the data processing unit 71.

When the AC input voltage decreases due to a power failure, a momentary interruption, or the like, the signal POWGOOD-N goes low, turning on the transistor TR3. Along with this, the power of +40 [V] secondary DC voltage stored in the electrolytic capacitor CP1 connected to the emitter side of the transistor TR3 is supplied to the collector side.

The remaining power is supplied to the collector side until the power of the secondary DC voltage of +40 [V] is lost. However, since the Zener diode ZD3 is provided, the data processing unit is operated by the remaining power. The secondary side DC voltage supplied to 71 does not exceed +5 [V]. Therefore, it is possible to extend the time from when the decrease in the AC input voltage is detected to when the secondary DC voltage supplied to the data processing unit 71 becomes lower than +5 [V].

FIG. 6 is a comparison diagram of the secondary DC voltage in the second embodiment of the present invention and the secondary DC voltage in the conventional power supply control device. In the figure, the horizontal axis represents time, and the vertical axis represents secondary DC voltage.

In the figure, L3 is a line showing the secondary DC voltage of +5 [V] in the present embodiment, L4 is a line showing the secondary DC voltage of +5 [V] in the conventional power supply control device, L5 Is a line indicating +40 [V] secondary DC voltage in the present embodiment, and L6 is a line indicating +40 [V] secondary DC voltage in the conventional power supply control device.

As shown in the figure, the conventional +40 [V]
When the AC input voltage decreases due to a power failure, instantaneous interruption, or the like at the timing t1, the secondary side DC voltage decreases as time passes, as indicated by the line L6. In addition, the conventional +5
When the AC input voltage decreases at the timing t1, the secondary side DC voltage of [V] rapidly decreases as time passes, as indicated by the line L4.

On the other hand, in the present embodiment,
When the AC input voltage decreases at the timing t1, the transistor TR3 is turned on, and the power of the secondary DC voltage of +40 [V] stored in the electrolytic capacitor CP1 is supplied to the collector side, which is indicated by the line L3. Like, +5
[V] is maintained. Thereafter, the power stored in the electrolytic capacitor CP1 decreases, and at the timing t3, the power is increased by +5.
When [V] cannot be maintained, it gradually decreases. In addition, +40 stored in the electrolytic capacitor CP1
As the power of the secondary side DC voltage of [V] is supplied to the collector side, the secondary side DC voltage of +40 [V]
As shown in FIG. 5, the voltage rapidly decreases with time and becomes +5 [V] at the timing t2. Thereafter, when the power stored in the electrolytic capacitor CP1 decreases and it becomes impossible to maintain +5 [V] at the timing t3, the power gradually decreases.

As described above, in the present embodiment, A
When the C input voltage decreases, the secondary DC voltage of +5 [V] is maintained by the power stored in the electrolytic capacitor CP1, so that the power required to save data is sufficiently supplied to the data processing unit 71. can do. Moreover, A
After the C input voltage drops, the secondary DC voltage is +5 [V]
Since the time until the temperature becomes lower becomes longer, not only the data is saved but also a process that requires a long time can be performed.

Next, a third embodiment of the present invention will be described. Note that the structure of the circuit of the power supply control device according to the present embodiment is the same as that of the first embodiment, and will be described with reference to FIGS.

In this case, the signal POWG as the voltage drop detection signal generated by the AC low detection circuit 15
OOD-N is transmitted to a higher-level device, and a signal PO is transmitted to a specific signal line of an interface connector in the higher-level device.
WGOOD-N is supplied. To this end, a transmission means for transmitting the signal POWGOOD-N to the host device as a signal on the interface is provided on the control board of the printer.

The higher-level device outputs the signal POWGOOD
−N is read, and it is possible to determine whether the AC input voltage has decreased in the printer based on whether the signal POWGOOD-N is at a high level or a low level.

Then, the upper device receives the signal POWGOOD-
When N goes low and it detects that the AC input voltage of the printer has dropped, it immediately stops sending data to the printer. Therefore, the host device does not needlessly transmit data to the printer, and when the printer is turned off and then turned on again, it is necessary to send data from the host device to the printer again from the beginning. Disappears. In addition, the fact that the power of the printer has been turned off can be displayed on the display screen of the host device to notify the operator.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0056]

As described above in detail, according to the present invention, in the power supply control device, the secondary-side voltage generating means for generating the secondary-side DC voltage based on the AC input voltage;
A voltage drop detecting means for detecting a drop in AC input voltage; processing data transmitted from a host device;
A data saving function unit having a function of saving data when a decrease in the input voltage is detected.

In this case, when the AC input voltage decreases, the remaining power is not unnecessarily consumed, so that the power required to save the data can be sufficiently supplied to the data saving function unit. Unprocessed data can be saved. As a result, when the power is turned off and then turned on again, there is no need to transmit data from the host device to the information device again from the beginning.

Further, in the printer, when the power is turned off and then turned on again, data such as the total number of print characters and the total number of line feeds can be read and used for subsequent counting. The life of the consumable can be accurately calculated based on data such as the total number of print characters and the total number of line feeds.

[Brief description of the drawings]

FIG. 1 is a first diagram illustrating a circuit of a power supply control device according to a first embodiment of the present invention.

FIG. 2 is a second diagram illustrating a circuit of the power supply control device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a secondary-side power supply generation circuit according to the first embodiment of the present invention.

FIG. 4 shows +5 [V] according to the first embodiment of the present invention.
Secondary DC voltage and +5 in the conventional power supply controller
FIG. 6 is a comparison diagram of [V] with a secondary-side DC voltage.

FIG. 5 is a diagram illustrating a circuit of a power supply control device according to a second embodiment of the present invention.

FIG. 6 is a comparison diagram of the secondary DC voltage in the second embodiment of the present invention and the secondary DC voltage in the conventional power supply control device.

[Explanation of symbols]

 14 Secondary-side power generation circuit 15 AC low detection circuit 71 Data processing unit 72 Sensor / display unit 74 Driving auxiliary circuit unit CP1 Electrolytic capacitor TR1, TR2 Transistor ZD3 Zener diode

Continuing from the front page (72) Inventor Koji Kawagoe 1-1, Tateda, Shono-ji, Fukushima-shi, Fukushima Prefecture In-house Data Systems Corporation (72) Inventor Hironori Moriguchi 1-1, Tateda, Shono-ji, Fukushima-shi, Fukushima Prefecture In Systems (72) Inventor Toru Mogi 1-1, Tateda, Shono, Fukushima City, Fukushima Prefecture F-Term in Oki Data Systems Corporation (Reference) 5B011 DB01 GG01 GG03 JA04 5G015 FA16 GB10 JA11 JA32 JA62 KA04

Claims (4)

[Claims] 1. A secondary-side voltage generating means for generating a secondary-side DC voltage based on an AC input voltage;
Voltage drop detection means for detecting a drop in input voltage; (c)
While processing the data transmitted from the host device,
A power control device comprising: a data saving function unit having a function of saving data when a decrease in the C input voltage is detected. 2. A non-data saving function unit having no function of saving data, and (b) a secondary DC to the non-data saving function unit when a decrease in AC input voltage is detected. A power supply control device comprising: a secondary-side DC voltage distribution means for stopping supply of a voltage. 3. A power storage means for storing power of a second secondary DC voltage higher than the first secondary DC voltage supplied to the data saving function unit; and And a secondary-side DC voltage replenishing unit that generates a first secondary-side DC voltage by the power stored in the power storage unit when the decrease is detected, and supplies the first secondary-side DC voltage to a data saving function unit. 3. The power supply control device according to 2. (A) the voltage drop detecting means generates a voltage drop detection signal when detecting a drop in the AC input voltage, and (b) uses the voltage drop detection signal as a signal on an interface for a higher-level device. The power supply control device according to claim 1, further comprising a transmission unit configured to transmit the power to the power supply.