Automatic transaction machines and power supplies

Abstract

To provide an automatic transaction device that suppresses wasted power by intermittently stopping inverter output. [Solution] In an automated teller machine equipped with a power supply device connected to a secondary battery that outputs DC and that can supply power in place of a commercial power supply, the power supply device has an AC / DC conversion unit that converts AC voltage supplied from the commercial power supply into DC voltage and generates a DC output, a DC / AC inverter unit that converts the DC output into AC voltage, and a load connection determination unit that determines whether a load is connected to the AC output of the DCAC inverter unit while the DC / AC inverter unit is outputting AC voltage. If the load connection determination unit determines that a load is not connected while the DC / AC inverter unit is operating, the load connection determination unit controls the DC / AC inverter unit to temporarily stop the AC output operation of the DC / AC inverter unit and then resume output after a predetermined period of time, repeating this process.

Description

[Technical Field]

[0001] The present invention relates to an automatic transaction device and a power supply device. [Background technology]

[0002] In automated teller machines, it is common for a power supply device equipped with a secondary battery built into the machine to operate as a backup process in the event of a power outage.

[0003] For example, Patent Document 1 discloses a power supply device that includes an inverter that converts current from a commercial power source and a secondary battery.

[0004] The power supply device described in Patent Document 1 includes a commercial power input unit connected to a commercial power source and receiving an AC voltage, a DC power input unit connected to a DC power source and receiving a DC voltage, a power output unit outputting an AC voltage, a secondary battery, a charger that charges the secondary battery with the AC voltage of the commercial power source, and an inverter that converts the DC voltage output from the secondary battery into an AC voltage for the commercial power source. It is described that the disclosed power supply device has a first switch, a second switch, and a third switch that can be switched in conjunction with each other according to the operating mode, which is an AC charging mode, a DC charging mode, or a discharging mode. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2008-109782 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the power supply device described in Patent Document 1 requires a circuit for switching to commercial power when an AC load is not in use, which increases the circuit size. There is a demand for a circuit that saves energy and does not require a circuit for switching to commercial power when an AC load is not in use.

[0007] The present invention has been made in consideration of the above points, and aims to provide an automatic transaction device and a power supply device that detects inverter output current, periodically monitors whether the inverter output is being used, and stops the inverter output to reduce power consumption if it is determined that the inverter output is not being used. [Means for solving the problem]

[0008] The automatic transaction device according to the present invention is an automatic transaction device equipped with a power supply device that is connected to a secondary battery that outputs DC and is capable of supplying power in place of a supply from a commercial power source, wherein the power supply device has an ACDC conversion unit that converts AC voltage supplied from the commercial power source into DC voltage and generates DC output, a DC / AC inverter unit that converts the DC output into AC voltage, and a load connection determination unit that determines whether a load is connected to the AC output of the DCAC inverter unit during AC output operation of the AC voltage by the DCAC inverter unit, and is characterized in that when it is determined that a load is not connected during operation of the DCAC inverter unit, the load connection determination unit controls the DCAC inverter unit to temporarily stop the AC output operation of the DCAC inverter unit and resume output after a predetermined period of time, repeatedly.

[0009] A power supply device according to the present invention comprises terminals connected to a secondary battery that outputs a DC output, an AC / DC conversion unit that converts AC voltage supplied from a commercial power source into a DC voltage and generates a DC output, a charging circuit that charges the secondary battery, a DC / AC inverter unit that converts the DC output into an AC voltage, a current detection unit that detects the current in the AC output of the DC / AC inverter unit, and a power supply control unit that controls the charging circuit, the DC / AC inverter unit, and the current detection unit, and is characterized in that the power supply control unit repeatedly stops the AC output operation of the DC / AC inverter unit and then resumes the output after a predetermined period of time. [Effects of the Invention]

[0010] According to the present invention, the output current of the AC inverter is detected and it is periodically monitored whether the AC inverter output is being used. If it is determined that the AC inverter output is not being used, the AC inverter output is stopped, thereby reducing wasted power.

[0011] Furthermore, according to the present invention, the connection status of an external device is detected and periodically monitored to determine whether the AC inverter output is in use, and if it is determined that the AC inverter output is not in use, the AC inverter output is stopped, thereby achieving the effect of reducing power consumption and reducing wasted power. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing a configuration of an automatic transaction device according to a first embodiment. [Figure 2] FIG. 2 is a block diagram of a power supply device in the automatic transaction apparatus according to the first embodiment. [Figure 3] Fig. 10 is a flowchart showing the operation of the automatic transaction apparatus according to the first embodiment when a power outage occurs Fig. 11 is a flowchart showing the processing of the power supply device in the automatic transaction apparatus according to the first embodiment when a power outage occurs Fig. 12 is a flowchart showing the operation of the automatic transaction apparatus according to the first embodiment when a power outage occurs Fig. 13 is a flowchart showing the processing of the power supply device in the automatic transaction apparatus according to the first embodiment when a power outage occurs [Figure 4] 10 is a flowchart showing the processing of the intermittent stopping operation of the AC inverter output by the power supply control circuit in the automatic transaction device according to the first embodiment in the event of a power outage. FIG. [Figure 5] FIG. 10 is a block diagram showing the configuration of an automatic transaction device according to a second embodiment. [Figure 6] FIG. 10 is a flowchart showing the process of intermittently stopping the AC inverter output by the power supply control circuit in the automatic transaction device according to the second embodiment during a power outage. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same components are designated by the same reference numerals, and the description of the same components will be omitted.

[0014] (First Example) (Configuration explanation) FIG. 1 is a configuration diagram illustrating an automated transaction apparatus 1 according to the first embodiment.

[0015] The automated transaction device 1 is an automated teller machine including a power supply device 10, a secondary battery 20 connected to the power supply device 10, a mechanical unit 30, a control unit 40, and a display unit 50.

[0016] The power supply device 10 receives power from, for example, a commercial power supply 2 of AC 100V to 240V external to the device, converts the power, and supplies it to the mechanical unit 30, the control unit 40, and the display unit 50. The power supply device 10 also receives power from the commercial power supply 2, converts the power, and supplies it to the secondary battery 20. The secondary battery 20 is built into the automated teller machine 1.

[0017] Furthermore, in the event of a power outage, for example when the power supply from the commercial power source 2 is cut off, the power supply device 10 receives power from the secondary battery 20 instead of from the commercial power source 2, and switches the power supply mode so as to supply power to each of the mechanical unit 30, the control unit 40, and the display unit 50. The power supply device 10 is then connected to an external outlet 202 for AC output of the automated teller machine.

[0018] The secondary battery 20 is a DC output uninterruptible power supply. The secondary battery 20 is connected to the power supply device 10 and receives power from the power supply device 10 to be charged when there is no power outage, and is controlled by the power supply device 10 to supply power to the power supply device 10 when there is a power outage.

[0019] The mechanical unit 30 is a mechanical unit consisting of a card unit 31, a bankbook unit 32, a bill unit 33, and a coin unit .

[0020] The card unit 31 is a mechanical unit that handles cards (bank cards and credit cards). For example, when a transaction is executed, the card unit 31 has functions such as taking a card inserted by an operator through a card insertion / ejection slot (not shown) into the device, reading magnetic information from a magnetic stripe provided on the card, and reading stored information from a memory unit (IC chip) built into the IC card. Furthermore, when the transaction is completed, the card unit 31 ejects the card from the device through the card insertion / ejection slot.

[0021] The passbook unit 32 is a mechanical part that handles passbooks. The passbook unit 32 has functions such as taking a passbook inserted by an operator through a passbook insertion / ejection slot (not shown) into the device when a transaction is being carried out, printing on the passbook, and reading magnetic data from a magnetic tape affixed to the passbook. Furthermore, the passbook unit 32 ejects the passbook from the passbook insertion / ejection slot to the outside of the device when the transaction is completed.

[0022] The banknote unit 33 is a mechanical part that handles banknotes. The banknote unit 33 has functions such as taking banknotes inserted by an operator through a banknote insertion slot (not shown) into the device when a transaction is being carried out, validating the banknotes, and stacking the banknotes in a predetermined location inside the device. During a transaction, the banknote unit 33 also ejects banknotes that cannot be taken into the device or that should be returned to the operator from a banknote ejection slot (not shown) to the outside of the device.

[0023] The coin unit 34 is a mechanism that handles coins. For example, when a transaction is performed, the coin unit 34 has functions such as taking coins inserted by an operator through a coin insertion slot (not shown) into the device, validating the coins, and accumulating the coins in a predetermined location inside the device. Furthermore, during a transaction, the coin unit 34 ejects coins that cannot be taken into the device or coins that should be returned to the operator from a coin ejection slot (not shown) onto a tray outside the device.

[0024] The card unit 31, the bankbook unit 32, the bill unit 33 and the coin unit 34 each include a mechanical unit having a transport motor for transporting the media to be handled and a drive unit for driving the motor.

[0025] The display unit 50 is configured as a touch panel display that integrates an input section and a display section, and uses, for example, an LCD (Liquid Crystal Display) or an EL (Electro-Luminescence) display. The display unit 50 is provided on the top surface of the front part of the housing.

[0026] The display unit 50 has functions such as detecting input of transaction information from the operator during a transaction, and displaying transaction information or notifications to the operator.

[0027] The control unit 40 is, for example, a computer equipped with an OS (Operating System), and is connected to the mechanical unit 30 and the display unit 50 to control them.

[0028] The control unit 40 includes, for example, a communication unit that communicates via a network, a non-volatile storage unit such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and a storage unit such as a RAM (Random Access Memory) and a ROM (Read Only Memory).

[0029] The control unit 40 functions as an automated transaction device by expanding the OS and application programs stored in the HDD or SSD into the RAM and ROM, and executing the programs by a CPU (Central Processing Unit).

[0030] In addition, when the power supply device 10 detects a power outage (power supply from the commercial power source 2 is cut off), the control unit 40 sends a backup start signal to the power supply device 10 indicating the start of backup processing, and causes power to be supplied from the secondary battery 20 to perform backup processing of the mechanical unit 30, the display unit 50, and the control unit 40.

[0031] In this description, backup processing refers to processing that occurs when a power outage occurs, in which an operator completes or forcibly terminates a transaction in progress, causes the mechanical unit 30 to return cards, passbooks, banknotes, and coins that should be returned to the operator, and shuts down the OS of the control unit 40, i.e., the automated transaction apparatus 1. The backup processing may also include a backup power supply operation that supplies power from the secondary battery 20 to the mechanical unit 30 and the control unit 40 during the backup processing.

[0032] Fig. 2 is a block diagram of the power supply device 10 in the automatic transaction device 1 of the first embodiment. In Fig. 2, solid lines indicate power supply lines, and dashed lines indicate control signal lines.

[0033] The power supply device 10 includes a terminal 21 connected to a secondary battery 20, a power factor correction circuit 100, a control system power supply power conversion circuit 110, a mechanical system power supply power conversion circuit 120, a charging circuit 130, a secondary battery voltage detection circuit 140, a power failure detection circuit 150, a mechanical system power supply step-up / step-down circuit 160, a mechanical system power supply voltage switching circuit 170, a control system power supply voltage switching circuit 180, a power supply control circuit 190, a direct current alternating current (DCAC) inverter unit 200, a current detection unit 201, and an outlet 202. The power supply device 10 has an uninterruptible power supply function.

[0034] The power factor correction circuit 100 is connected to a commercial power supply 2. Furthermore, a mechanical power supply step-up / step-down circuit 160 and a control power supply voltage switching circuit 180 are connected to a secondary battery 20.

[0035] The power factor correction circuit 100 is a non-insulated DC power supply circuit (ACDC converter or ACDC conversion unit). The power factor correction circuit 100 receives power (AC voltage of 100V to 240V) from a commercial power source 2, converts it into a predetermined DC voltage value (primary side DC voltage), and improves the power factor during conversion.

[0036] The power factor correction circuit 100 includes, for example, a transistor (not shown) and controls the transistor to turn on and off so as to match the waveform of the input AC voltage with the waveform of the AC current in the power factor correction circuit 100, thereby reducing harmonic components and improving the power factor.

[0037] The power factor correction circuit 100 also supplies the converted primary side DC voltage to the control system power supply power conversion circuit 110 and the mechanism system power supply power conversion circuit 120 .

[0038] The control system power supply power conversion circuit 110 is an isolated power supply circuit (DC-DC converter) that steps down the primary side DC voltage to the DC power supply voltage of the control unit 40. The control system power supply power conversion circuit 110 supplies an output voltage to the control unit 40 via the control system power supply voltage switching circuit 180.

[0039] The mechanical power supply power conversion circuit 120 is an isolated power supply circuit (DC-DC converter) that steps down the primary side DC voltage to a DC voltage value that drives the mechanical unit 30. The mechanical power supply power conversion circuit 120 supplies an output voltage to the mechanical unit 30 via the mechanical power supply voltage switching circuit 170.

[0040] The control system power supply power conversion circuit 110 and the mechanism system power supply power conversion circuit 120 use a forward circuit, a bridge circuit, an LLC circuit, or the like, depending on the power consumption of the control unit 40 and the mechanical unit 30, respectively.

[0041] In this way, the power supply device 10 is provided with two power conversion circuits, the mechanical system power supply power conversion circuit 120 and the control system power supply power conversion circuit 110, for the mechanical unit 30 and the control unit 40, respectively.

[0042] Therefore, compared to a system that uses a single power conversion circuit and outputs two output voltages using two secondary windings, the power supply device 10 can drive either the control system power supply power conversion circuit 110 or the mechanism system power supply power conversion circuit 120 independently.

[0043] The charging circuit 130 is connected between the output terminal of the control system power supply power conversion circuit 110 and the secondary battery 20 .

[0044] The charging circuit 130 charges the secondary battery 20 at the output voltage value of the control system power supply power conversion circuit 110, for example, when there is no power outage (when the output voltage value of the control system power supply power conversion circuit 110 is greater than the voltage value of the secondary battery 20).

[0045] In addition, the charging circuit 130 includes, for example, a diode (not shown) that blocks current from flowing from the secondary battery 20 to the output terminal of the control system power supply power conversion circuit 110 during a power outage (when the output voltage value of the control system power supply power conversion circuit 110 is less than the voltage value of the secondary battery 20).

[0046] The secondary battery voltage detection circuit 140 is connected to the connection line of the secondary battery 20 and detects the voltage of the secondary battery 20 , and transmits a secondary battery voltage signal to the control unit 40 via the power supply control circuit 190 .

[0047] The power failure detection circuit 150 is connected between the commercial power source 2 and the power factor correction circuit 100, and is a circuit that detects a power outage (a power failure) of the AC power supplied by the commercial power source 2. When a power failure is detected, the power failure detection circuit 150 transmits a power failure signal to the control unit 40 via the power supply control circuit 190.

[0048] The mechanical power supply step-up / step-down circuit 160 is an isolated power supply circuit (DC-DC converter) that increases or decreases the voltage value of the power supplied from the secondary battery 20 during a power outage to a DC voltage value that drives the mechanical unit 30. The mechanical power supply step-up / step-down circuit 160 uses a forward circuit, a bridge circuit, an LLC circuit, or the like according to the power consumption of the mechanical unit 30.

[0049] The mechanical power supply voltage switching circuit 170 has a diode 171 and switches between the power supplied from the mechanical power supply power conversion circuit 120 to the mechanical unit 30 and the power supplied from the mechanical power supply step-up / step-down circuit 160 to the mechanical unit 30 .

[0050] Specifically, during a power outage, the mechanism power supply voltage switching circuit 170 switches the current when the output voltage value of the mechanism power supply power conversion circuit 120 drops below the output voltage value of the mechanism power supply step-up / step-down circuit 160 (more precisely, when it drops below the voltage value obtained by subtracting the forward voltage value of the diode 171 from the output voltage value of the mechanism power supply step-up / step-down circuit 160).

[0051] The control system power supply voltage switching circuit 180 has a diode 181 and switches between the power supplied from the secondary battery 20 to the control unit 40 and the power supplied from the control system power supply power conversion circuit 110 to the control unit 40 .

[0052] Specifically, during a power outage, the control system power supply voltage switching circuit 180 switches when the output voltage value of the control system power supply power conversion circuit 110 drops below the output voltage value of the secondary battery 20 (more precisely, when it drops below the voltage obtained by subtracting the forward voltage value of the diode 181 from the voltage value of the secondary battery 20).

[0053] As a result, even during a power outage, i.e., when the power supply from the power factor correction circuit 100 is cut off, the control system power supply power conversion circuit 110 and the mechanism system power supply power conversion circuit 120 can supply power from the secondary battery 20 to the control unit 40 and the mechanism unit 30, just as they would during a non-power outage.

[0054] In addition, when there is no power outage, current flows (charges) from the control system power supply power conversion circuit 110 to the secondary battery 20 via the charging circuit 130, so no power is supplied from the secondary battery 20 to the mechanism system power supply step-up / step-down circuit 160 and the control system power supply voltage switching circuit 180.

[0055] In response to the power failure detection signal received from the power failure detection circuit 150, the control unit 40 transmits a backup start signal to the charging circuit 130, causing the charging circuit 130 to execute a backup power supply operation in which power is supplied from the secondary battery 20.

[0056] The power supply control circuit 190 is composed of a control unit such as a microcontroller, and is driven regardless of whether there is a power outage or not by the output voltage of the control system power supply voltage switching circuit 180. The power supply control circuit 190 monitors the secondary battery voltage detection circuit 140 and the power outage detection circuit 150.

[0057] The power supply control circuit 190 monitors a direct current alternating current (DCAC) inverter unit 200 based on the current detection result of a current detection unit 201 connected to the output of the inverter unit 200.

[0058] Although not shown, the power supply control circuit 190 is a power supply control unit that includes a microcontroller including an interface with the main controller 3 and a memory unit (not shown) such as a RAM or SSD. Note that some or all of the functions of the power supply control circuit 190 may be realized by hardware such as a DSP, ASIC, or FPGA.

[0059] The memory unit stores a control program executed by the power supply control circuit 190. The power supply control circuit 190 reads out and executes the control program from the memory unit, thereby functioning as a load connection determination unit that determines whether or not there is a load on the AC output outlet 202 of the direct current alternating current (DCAC) inverter unit 200.

[0060] The load connection determination unit (power supply control circuit 190) determines whether or not a load is connected to the AC output of the DCAC inverter unit 200 during AC output operation of an AC voltage by the DCAC inverter unit 200. If it is determined that no load is connected during operation of the DCAC inverter unit 200, the load connection determination unit (power supply control circuit 190) controls the DCAC inverter unit 200 to temporarily stop the AC output operation of the DCAC inverter unit 200 and then resume the output after a predetermined period, and repeats this process.

[0061] The power supply control circuit 190 (load connection determination unit) is connected to a current detection unit 201 that detects the current in the AC output of the DCAC inverter unit 200, and therefore the power supply control circuit 190 (load connection determination unit) determines that no load is connected to the outlet 202 when the current in the AC output of the DCAC inverter unit 200 is equal to or less than a threshold value.

[0062] In another example, in the power supply device 10, when a specific electronic device operating on the AC output of the DCAC inverter unit 200, such as a wireless LAN router or other electronic device, is connected to the outlet 202 of the power supply device 10 and the wireless LAN client device 41 is connected to the control unit 40, the power supply control circuit 190 (load connection determination unit) determines that no load is connected to the outlet 202 if an identifier (such as an SSID) identifying the electronic device, such as the wireless LAN router, is not detected. SSID stands for "Service Set Identifier" and is an identifier that plays an important role in wireless networks. Essentially, an SSID is an identifier assigned to a Wi-Fi (registered trademark) network when the router is set up.

[0063] (Explanation of operation) (Backup processing during power outages) The backup process of the automated transaction apparatus 1 according to the first embodiment during a power outage will be described in detail below with reference to FIG.

[0064] 3 is a flowchart showing the operation of the automated teller machine of the first embodiment when a power outage occurs. The left side of the drawing is a flowchart of the power supply control circuit 190 (FIG. 2), and the right side is a flowchart of the control unit 40 (FIG. 2).

[0065] When the power failure detection circuit 150 (FIG. 2) detects the occurrence of a power failure, the power failure detection circuit 150 notifies the power failure control circuit 190, and the power failure control circuit 190 transmits a power failure signal to the control unit 40 via the control line (FIG. 2) (S10).

[0066] The power supply control circuit 190 then continues to perform backup processing (S11). This backup processing includes starting the mechanical power supply step-up / step-down circuit 160 (FIG. 2) and having the secondary battery voltage detection circuit 140 (FIG. 2) monitor the secondary battery voltage, and transmitting a secondary battery voltage drop signal to the control unit 40 when the secondary battery voltage drops.

[0067] The control unit 40 performs interrupt processing upon receiving the power failure signal from the power supply control circuit 190. In this interrupt processing, the entire automatic transaction apparatus 1 (the control unit 40 and the mechanical unit 30) is backed up, so the control unit 40 continues operation (S12).

[0068] Then, the control unit 40 determines whether the secondary battery voltage has dropped based on the presence or absence of a secondary battery voltage drop signal (S13). If the secondary battery voltage has not dropped (No in S13), the control unit 40 returns the process to S12 and continues operation.

[0069] On the other hand, if the secondary battery voltage is low (Yes in S13), the control unit 40 proceeds to S14 and determines whether a transaction is in progress (S14). If a transaction is not in progress (No in S14), the control unit 40 shuts down the OS (S17).

[0070] On the other hand, if a transaction is in progress (Yes in S14), the control unit 40 performs processing to forcibly terminate or complete the transaction (S15) and performs processing to return the card (S16). After the card is returned, the control unit 40 shuts down the OS (S17). Here, the control unit 40 can also complete one transaction in progress before shutting down (S17) without forcibly terminating the transaction in S15.

[0071] If power is restored and the power failure signal is released before the secondary battery voltage drop signal is detected, the control unit 40 may continue normal operation.

[0072] (Alarm processing operation) The power supply control circuit 190 is connected to the control unit 40 via a control line (dashed line), and transmits a power outage signal, a secondary battery voltage drop signal, an alarm signal, etc. to the control unit 40. The alarm signals include a fault signal for the power supply device 10 and a fault signal for the secondary battery 20. Here, we will explain the alarm processing operation of the automatic transaction apparatus 1 when the power supply control circuit 190 sends an alarm signal to the control unit 40 via the control line.

[0073] The alarm signals include a "power supply failure detection alarm signal" and a "secondary battery failure detection alarm signal."

[0074] First, in the case of a "power supply failure detection alarm signal," the control unit 40 (Fig. 2) suspends operation and displays on the display unit 50 (Fig. 1) that the power supply 10 (Fig. 2) has failed. At this point, if the power supply 10 has failed, the worker performs the work of replacing the power supply. Note that, depending on the failed part within the power supply 10 (for example, the mechanical power boost / buck circuit 160), backup may not be possible in the event of a power outage, but normal operation is possible if no power outage occurs. For this reason, the control unit 40 may continue operation and display on the display unit 50 (Fig. 1) a message urging the user to replace the power supply 10.

[0075] Next, in the case of a "secondary battery failure detection alarm signal," the control unit 40 stops operation and an operator replaces the secondary battery to ensure backup in the event of a power outage. Normal operation is possible if no power outage occurs. For this reason, the control unit 40 may continue operation and display a message on the display unit 50 (FIG. 1) urging the operator to replace the secondary battery 20 (FIG. 1).

[0076] (Intermittent shutdown of AC inverter output) The power supply device 10 has a backup AC output function for use in the event of a power outage and is connected to an outlet 202, but when there is no power outage, it supplies DC from the control system power supply power conversion circuit 110 to the DCAC inverter unit 200. This causes AC to be output from the DCAC inverter unit 200, and an AC voltage appears at the outlet 202. Figure 4 shows the flow of the operation of the power supply control circuit 190 to intermittently stop the AC inverter output.

[0077] When the power supply (not shown) is turned on (S201) and the commercial power source 2 is supplied to the power supply device 10, the power factor correction circuit 100 operates, and its output is supplied to the DCAC inverter unit 200, causing the inverter to start operating (S202). The current detection unit 201 monitors whether a current is flowing (monitors whether the current is below a threshold) (S203). If a current is detected (Yes in S203), the DCAC inverter unit 200 continues operating, and this operation is repeated. If the current detection unit 201 cannot detect a current (No in S203), the current detection operation continues for one minute. If no current is detected after one minute has elapsed (Yes in S204), the DCAC inverter unit 200 stops operating (S205). It is determined whether one minute has elapsed since the DCAC inverter unit 200 stopped operating (S207), and after the elapsed time (Yes in S207), the DCAC inverter unit 200 starts operating again (S202).

[0078] As described above, according to the first embodiment, whether or not an AC device is connected to the AC inverter output is determined by checking the output current, and if no AC device is connected, the AC inverter output is turned off, so that no unnecessary power is used, thereby achieving the effect of saving power.

[0079] Although this embodiment has been described with reference to an automated teller machine, it can also be implemented in a power supply device with an AC inverter output function, a UPS, or a portable power supply device.

[0080] (Second Example) (Configuration explanation) In the first embodiment, the power supply control circuit 190 (load connection determination unit) determines that no load is connected to the outlet 202 based on the detection result by the current detection unit 201 in the AC output of the DCAC inverter unit 200.

[0081] 5, the second embodiment is the same as the automated teller machine 1 of the first embodiment, except that a wireless LAN slave device 41 is connected to the control unit 40 separately from the current detection unit 201. In the second embodiment, for example, the power supply control circuit 190 (load connection determination unit) can determine via the wireless LAN slave device 41 and the control unit 40 that a wireless LAN master router (not shown) of the wireless LAN slave device 41 is connected to the outlet 202 of the power supply device 10 and the wireless LAN master router serves as a load.

[0082] (Explanation of operation) (Backup processing during power outages) 4 shows the flow of the operation of intermittently stopping the AC inverter output by the power supply control circuit 190 in the second embodiment. However, since the configuration of the automatic transaction device 1 and the configuration of the power supply device 10 and each processing flow are the same as those in the first embodiment, only the differences from the first embodiment will be explained.

[0083] In the second embodiment, steps S301 to S307 of the intermittent stopping operation of the AC inverter output during a power outage are the same as steps S201 to S207 of the first embodiment except for step S303, and only step S303 will be explained.

[0084] In step S303, the power supply control circuit 190 determines, via the wireless LAN client 41 and the control unit 40, whether an identifier (SSID) that identifies the electronic device of the wireless LAN master router is detected. If the SSID is detected (Yes in S203), the power supply control circuit 190 continues operating the DCAC inverter unit 200, and repeats this operation. If the power supply control circuit 190 cannot detect the SSID (No in S203), it continues current detection operation for one minute. If the SSID cannot be detected after one minute has elapsed (Yes in S204), it stops the operation of the DCAC inverter unit 200 (S205). It determines whether one minute has elapsed since the DCAC inverter unit 200 stopped operating (S207), and after the elapsed time (Yes in S207), it starts the operation of the DCAC inverter unit 200 again (S202).

[0085] As described above, according to the second embodiment, whether or not an AC device (specific electronic device) is connected to the AC inverter output is determined by checking the SSID, and if no connection is made, the AC inverter output is turned off, thereby preventing unnecessary power consumption and achieving power saving effects. [Explanation of symbols]

[0086] 41 Wireless LAN adapter 190 Power supply control circuit 200 DC / AC inverter section 201 Current detection unit electrical outlet

Claims

1. An automated teller machine having a power supply device that is connected to a secondary battery that outputs DC and that can supply power instead of power from a commercial power source, The power supply device an AC-DC conversion unit that converts AC voltage supplied from a commercial power source into DC voltage and generates a DC output; a DC / AC inverter unit that converts the DC output into an AC voltage; a load connection determination unit that determines whether or not a load is connected to the AC output of the DC-AC inverter unit during an AC output operation of the DC-AC inverter unit to output the AC voltage, The automatic transaction device is characterized in that, when it is determined that a load is not connected while the DC-AC inverter unit is operating, the load connection determination unit controls the DC-AC inverter unit to temporarily stop the AC output operation of the DC-AC inverter unit and then resume output after a predetermined period of time.

2. the load connection determination unit is connected to a current detection unit that detects a current in the AC output of the DC / AC inverter unit, 2. The automatic transaction device according to claim 1, wherein the load connection determination unit determines that the load is not connected when the current in the AC output of the DC / AC inverter unit is equal to or less than a threshold value.

3. the power supply device is connected to a specific electronic device that operates on the AC output of the DC / AC inverter unit, 2. The automated teller machine according to claim 1, wherein the load connection determination unit determines that the load is not connected when an identifier that identifies the electronic device is not detected.

4. 2. The automatic transaction device according to claim 1, further comprising an outlet for outputting the AC voltage of the DC-AC inverter unit.

5. a terminal connected to a secondary battery that outputs a DC output; an AC-DC conversion unit that converts AC voltage supplied from a commercial power source into DC voltage and generates a DC output; a charging circuit for charging the secondary battery; a DC / AC inverter unit that converts the DC output into an AC voltage; a current detection unit that detects a current in the AC output of the DC / AC inverter unit; a power supply control unit that controls the charging circuit, the DC / AC inverter unit, and the current detection unit, The power supply device is characterized in that the power supply control unit repeatedly stops the AC output operation of the DC / AC inverter unit and then resumes the output after a predetermined period of time.

6. The power supply device according to claim 5 , further comprising an outlet for outputting the AC voltage of the DC-AC inverter unit.

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