JP2007124781A - Power supply device, uninterruptible power supply device and power output control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply device which can control start or stop of power output to a load apparatus connected with a second output terminal while interlocking with turn on/off of a load apparatus connected with a first output terminal, and can suppress a rush current flowing into the power supply device, and to provide an uninterrptible power supply device and a power output control method. <P>SOLUTION: A current detecting section 16 detects the magnitude of a current delivered from an output terminal OT1 through a switch 17. Upon elapsing a predetermined delay time after the magnitude of a current delivered from the output terminal OT1 reached a predetermined threshold, a CPU 19 turns a switch 18 on to start power output from an output terminal OT2, and stops power output from the output terminal OT2 when the magnitude of a current delivered from the output terminal OT1 is under the predetermined threshold. The invention is applicable to an uninterrptible power supply. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device, an uninterruptible power supply device, and a power output control method, and more particularly, to a power supply device, an uninterruptible power supply device, and a power output control method that suppress an inrush current flowing through the power supply device or the uninterruptible power supply device. .

  Conventionally, if the operation of the peripheral device of the computer is not detected for a predetermined time, the power of the peripheral device is automatically shut off, and if the operation of the peripheral device is detected after the power is turned off, the power of the peripheral device is automatically turned on again A power supply device has been proposed (see, for example, Patent Document 1).

  By the way, when a load device connected to an uninterruptible power supply (UPS), which is one type of power supply device, is activated, an inrush current accompanying the activation of the load device flows to the UPS. When there are many load devices connected to the UPS, if those load devices are activated at once, the inrush current to those load devices is added and flows to the UPS, which destroys the UPS. there is a possibility.

As a method for preventing the destruction of the UPS due to the inrush current, first, an inrush current suppressing circuit for suppressing the inrush current may be provided in the UPS. In addition, when starting the UPS, it is conceivable to start outputting power from a plurality of output terminals provided in the UPS with a time difference.
JP 2000-242371 A

  However, when an inrush current suppression circuit is provided inside the UPS, when a large inrush current occurs, the output voltage of the UPS may drop, and the load device may not start normally.

  In addition, when starting the UPS, the method of starting the output of power from the plurality of output terminals provided in the UPS with a time difference is used. Are activated simultaneously, the inrush current to those load devices is added and flows to the UPS. Therefore, when starting up the load device, it is necessary to always stop the UPS and then restart it.

  Further, the invention described in Patent Document 1 controls the power supply based on the operation of the load device, and does not describe suppressing the inrush current that flows when the load device is activated.

  The present invention has been made in view of such a situation, and is intended to suppress an inrush current flowing in a power supply device such as a UPS.

  The power supply device of the 1st side surface of this invention is a power supply device provided with the 1st output terminal and 2nd output terminal for outputting electric power outside, Comprising: The output output from the said 1st output terminal Current detection means for detecting the magnitude of the current, and when a predetermined time has elapsed since the magnitude of the output current is equal to or greater than a predetermined threshold, starts outputting power from the second output terminal, Output control means for controlling the output of power from the second output terminal to stop when the magnitude of the output current is less than the threshold value.

  In the power supply device according to the first aspect of the present invention, the power supply device including a first output terminal and a second output terminal for outputting power to the outside, the power is output from the first output terminal. When a predetermined time has elapsed since the magnitude of the output current is detected and the magnitude of the output current exceeds a predetermined threshold, the output of power from the second output terminal is started, and the output current Is controlled to stop output of power from the second output terminal.

  Accordingly, the start or stop of the output of power to the load device connected to the second output terminal is controlled in conjunction with the turning on or off of the power supply of the load device connected to the first output terminal. Can do. Moreover, the inrush current which flows into a power supply device can be suppressed.

  This current detection means is constituted by, for example, a detection resistor.

  This output control means is constituted by a CPU, for example.

  A power output control method according to a first aspect of the present invention is a power output control method for a power supply device including a first output terminal and a second output terminal for outputting power to the outside. When the magnitude of the output current output from the output terminal is detected and a predetermined time has elapsed since the magnitude of the output current has exceeded a predetermined threshold, the output of power from the second output terminal is And starting to control the output of power from the second output terminal to stop when the magnitude of the output current is less than the threshold.

  In the power output control method according to the first aspect of the present invention, in the power output control method for a power supply device including a first output terminal and a second output terminal for outputting power to the outside, In the power supply device including the first output terminal and the second output terminal for outputting the output current, the magnitude of the output current output from the first output terminal is detected, and the magnitude of the output current is predetermined. When a predetermined time has passed since the threshold value is exceeded, the output of power from the second output terminal is started, and when the magnitude of the output current is less than the threshold value, the second output terminal It is controlled to stop the output of power from the.

  Accordingly, the start or stop of the output of power to the load device connected to the second output terminal is controlled in conjunction with the turning on or off of the power supply of the load device connected to the first output terminal. Can do. Moreover, the inrush current which flows into a power supply device can be suppressed.

  The magnitude of the output current is detected by, for example, a detection resistor.

  Control of the output of power from the power supply device is performed by, for example, a CPU.

  The uninterruptible power supply device according to the second aspect of the present invention is an uninterruptible power supply device including a first output terminal and a second output terminal for outputting electric power to the outside, from the first output terminal. Current detection means for detecting the magnitude of the output current output, and output of power from the second output terminal when a predetermined time has elapsed since the magnitude of the output current exceeds a predetermined threshold value And when the magnitude of the output current is less than the threshold value, output control means for controlling to stop the output of power from the second output terminal.

  In the uninterruptible power supply according to the second aspect of the present invention, in the uninterruptible power supply including a first output terminal and a second output terminal for outputting electric power to the outside, the first output terminal When the magnitude of the output current output from the second output terminal is detected and a predetermined time has elapsed since the magnitude of the output current exceeds a predetermined threshold, the output of power from the second output terminal is started. When the magnitude of the output current is less than the threshold value, the output of power from the second output terminal is controlled to stop.

  Accordingly, the start or stop of the output of power to the load device connected to the second output terminal is controlled in conjunction with the turning on or off of the power supply of the load device connected to the first output terminal. Can do. Moreover, the inrush current which flows into an uninterruptible power supply device can be suppressed.

  This current detection means is constituted by, for example, a detection resistor.

  This output control means is constituted by a CPU, for example.

  A power output control method according to a second aspect of the present invention is a power output control method for an uninterruptible power supply device including a first output terminal and a second output terminal for outputting power to the outside. When the magnitude of the output current output from one output terminal is detected and a predetermined time has elapsed since the magnitude of the output current has exceeded a predetermined threshold, the power from the second output terminal Starting the output, and when the magnitude of the output current is less than the threshold value, controlling to stop the output of the power from the second output terminal.

  In the power output control method according to the second aspect of the present invention, in the power output control method of the uninterruptible power supply device including the first output terminal and the second output terminal for outputting power to the outside, In the uninterruptible power supply device including the first output terminal and the second output terminal for outputting electric power to the first output terminal, the magnitude of the output current output from the first output terminal is detected, and the output current When a predetermined time has elapsed since the magnitude became equal to or greater than a predetermined threshold, the output of power from the second output terminal is started, and when the magnitude of the output current is less than the threshold, the first Control is performed to stop the output of power from the two output terminals.

  Accordingly, the start or stop of the output of power to the load device connected to the second output terminal is controlled in conjunction with the turning on or off of the power supply of the load device connected to the first output terminal. Can do. Moreover, the inrush current which flows into an uninterruptible power supply device can be suppressed.

  The magnitude of the output current is detected by, for example, a detection resistor.

  Control of the output of power from the uninterruptible power supply is performed by, for example, a CPU.

  As described above, according to the first aspect of the present invention, the load connected to the second output terminal in conjunction with the turning on or off of the power supply of the load device connected to the first output terminal. The start or stop of power output to the device can be controlled. Moreover, according to the 1st side surface of this invention, the rush current which flows into a power supply device can be suppressed.

  According to the second aspect of the present invention, the power to the load device connected to the second output terminal is linked with the power on or off of the load device connected to the first output terminal. The start or stop of output can be controlled. Moreover, according to the 2nd side surface of this invention, the inrush current which flows into an uninterruptible power supply device can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an embodiment of a UPS to which the present invention is applied. A UPS 1 to which the present invention is applied includes a voltage / current detection unit 11, a line 12, a battery 13, an inverter 14, a switch 15, a current detection unit 16, switches 17 and 18, a CPU (Central Processing Unit) 19, a storage unit 20, and an external device. The interface (I / F) 21 is configured to include an input terminal IT1, output terminals OT1 and OT2, and an external terminal ET1.

  The voltage / current detection unit 11 includes, for example, a detection resistor and the like, detects the magnitude of the input voltage and the input current, and indicates data of the detected input voltage and input current (hereinafter referred to as input power data). Is supplied to the CPU 19.

  The line 12 is a line that propagates power from an external AC power source (not shown). That is, when the input voltage and input current are normal (that is, in a normal case), the input of the switch 15 is switched to the line 12 side and the switch 17 is turned on under the control of the CPU 19, and the input terminal IT1. Is output from the output terminal OT <b> 1 via the line 12, the switch 15, the current detection unit 16, and the switch 17. When the magnitude of the output current (hereinafter also referred to as main output current) output from the output terminal OT1 is equal to or greater than a predetermined threshold (hereinafter also referred to as sub output permission value), the switch is controlled based on the control of the CPU 19. 18 is turned on, and the electric power from the AC power source input from the input terminal IT1 is also output from the output terminal OT2 via the line 12, the switch 15, and the switch 18.

  The sub output permission value can be set to an arbitrary value by the user. For example, the total value of the standby current that flows when the power supply of the load device connected to the output terminal OT1 is turned off. It is set to a value that is larger and smaller than the magnitude of the current that flows when the load device connected to the output terminal OT1 is operating.

  The battery 13 is a standby power source (backup power source) for supplying power to the outside when an abnormality occurs in input power. Note that an AC voltage input from an external AC power supply via the input terminal IT1 is converted into a DC voltage by a charging circuit (not shown), and the DC voltage is applied to the battery 13, whereby the battery 13 is charged. The

  The inverter 14 converts the DC voltage of the battery 13 into an AC voltage having the same frequency and substantially the same level as the AC power source connected to the input terminal IT1, under the control of the CPU 19. When the input voltage or input current is abnormal due to the occurrence of a power failure or the like (that is, when the input power is abnormal), the input of the switch 15 is switched to the inverter 14 side under the control of the CPU 19, and the inverter 14 The output AC voltage is applied to the load device connected to the output terminal OT1 through the switch 15, the current detection unit 16, and the switch 17 (power is supplied). Further, when the magnitude of the main output current is equal to or greater than the sub output permission value and the switch 18 is turned on, the AC voltage output from the inverter 14 is output to the output terminal OT2 via the switch 15 and the switch 18. It is also applied to the connected load device (power is supplied).

  A DC / DC converter that converts the DC voltage of the battery 13 into a predetermined DC voltage may be provided between the battery 13 and the inverter 14.

  As described above, the input of the switch 15 is switched based on the control of the CPU 19. That is, the CPU 19 switches the input of the switch 15 to the inverter 14 side when the UPS 1 is in operation and the input power is abnormal, and otherwise the input of the switch 15 is connected to the line 12 side. Switch to.

  The current detection unit 16 includes, for example, a detection resistor and the like, detects the magnitude of the output current (main output current) output from the output terminal OT1, and indicates data indicating the magnitude of the detected output current (hereinafter, output) (Referred to as current data) is supplied to the CPU 19.

  The state of the switch 17 is switched based on the control of the CPU 19. That is, the CPU 19 turns on the switch 17 when the UPS 1 is operating, and turns off the switch 17 in other cases.

  The state of the switch 18 is switched under the control of the CPU 19. That is, the CPU 19 turns on the switch 18 when the UPS 1 is in an operating state and the predetermined time has elapsed since the main output current has exceeded the sub-output permission value. If it is less than the output permission value, the switch 18 is turned off. That is, the CPU 19 starts outputting power from the output terminal OT2 when a predetermined time has elapsed after the main output current becomes equal to or higher than the sub output permission value, and the main output current is less than the sub output permission value. Then, control is performed to stop the output of power from the output terminal OT2.

  Hereinafter, the switch 17 is also referred to as a main switch, and the switch 18 is also referred to as a sub switch. Hereinafter, the output terminal OT1 is also referred to as a main output terminal, and the output terminal OT2 is also referred to as a sub output terminal.

  The CPU 19 receives input power data supplied from the voltage / current detection unit 11, output current data supplied from the current detection unit 16, and an external device connected to the external terminal ET1 via the external interface 21. The operation of each part of the UPS 1 is controlled based on a command for instructing various processes or a user command input by operating an operation part (not shown) of the UPS 1. Further, the CPU 19 transmits information indicating the state of the UPS 1 and commands for instructing execution of various processes to an external device connected to the external terminal ET1 via the external interface 21.

  The storage unit 20 is configured by a nonvolatile storage medium such as a flash memory, an EEPROM (Electrically Erasable and Programmable Read Only Memory), and an HDD (Hard Disk Drive). The storage unit 20 stores, for example, various programs, setting values of the UPS 1, data necessary for the processing of the UPS 1, and the like.

  The external interface 21 communicates with an external device connected to the external terminal ET1.

  In the example of FIG. 1, the power supply method (that is, the configuration) of the UPS 1 is a so-called constant commercial power supply method for the sake of simplicity of explanation, but is not limited to the example of FIG. Various methods such as a so-called constant inverter method can be applied. In addition, although not shown, other components such as a filter unit may be provided so that a voltage having a waveform closer to a sine wave can be applied to the load device connected to the output terminal OT1 or OT2.

  Next, the power output control process executed by the UPS 1 will be described with reference to the flowchart of FIG.

  In the following description, as shown in FIG. 3, a personal computer 51 is connected to the main output terminal (output terminal OT1) of the UPS 1, and a personal computer such as a monitor or a printer is connected to the sub output terminal (output terminal OT2). It is assumed that the peripheral device 52 of the computer 51 is connected. Further, in FIG. 3, the input terminal IT1 is shown as a power plug of the UPS 1, and power is input to the UPS 1 from a commercial AC power supply by inserting the input terminal IT1 as a power plug into a commercial power outlet. .

  4 shows an AC input that is an input of power from the input terminal IT1 of the UPS 1, a main output that is an output of power from the main output terminal of the UPS 1, and a sub output that is an output of power from the sub output terminal of the UPS 1. 4 shows an example of a timing chart showing transitions of the power state of personal computer 51 and the power state of peripheral device 52 (on or off). Hereinafter, the output power control process by the UPS 1 will be described with reference to the timing chart of FIG. 4 as appropriate.

  This process is performed, for example, when the user turns on a power switch (not shown) of the UPS 1 and the input power (commercial AC power supply) from the input terminal IT1 is in a normal state, for example, the timing shown in FIG. In the chart, processing starts at time t0 when the AC input is turned on.

  In step S1, the CPU 19 activates the UPS 1 and turns on the main switch. Specifically, the CPU 19 switches the switch 15 to the line 12 side and turns on the main switch. Thereby, the output of electric power to the personal computer 51, which is a load device connected to the main output terminal, is started (the main output is turned on). At this time, the sub switch remains off, and output of power to the peripheral device 52, which is a load device connected to the sub output terminal, is not started. That is, in the timing chart of FIG. 4, the state is at time t1 when the main output is turned on. Further, the CPU 19 starts monitoring the main output current based on the output current data supplied from the current detection unit 16.

  In step S2, the CPU 19 determines whether or not the magnitude of the main output current has become equal to or greater than a predetermined threshold value. If it is determined that the magnitude of the main output current is equal to or greater than a predetermined threshold, that is, the sub-output permission value, for example, in the timing chart of FIG. 4, the personal computer 51 is turned on at time t2 and the sub-output is turned on. If a current larger than the output permission value starts to flow through the current detector 16, the process proceeds to step S3.

  In step S3, the CPU 19 turns on the sub switch after a predetermined delay time has elapsed. As a result, the output of power to the peripheral device 52 connected to the sub output terminal is started (the sub output is turned on), and the peripheral device 52 is set to automatically start in response to the input of power. If so, the peripheral device 52 is powered on. That is, in the timing chart of FIG. 4, the state is at time t3.

  In this way, a predetermined delay time is required after the load device (personal computer 51) connected to the main switch is activated until the load device (peripheral device 52) connected to the sub switch is activated. Therefore, the inrush current at the time of starting up the personal computer 51 and the inrush current at the time of starting up the peripheral device 52 are added and prevented from flowing to the UPS 1. That is, the inrush current flowing through the UPS 1 is suppressed.

  The delay time may be set to an arbitrary value by the user.

  In step S4, the CPU 19 determines whether or not the magnitude of the main output current is less than a predetermined threshold value. If it is determined that the magnitude of the main output current is equal to or greater than the predetermined threshold, that is, the sub-output permission value, that is, if the personal computer 51 is still on, the process is stepped. Proceed to S5.

  In step S5, the CPU 19 determines whether to stop the UPS 1 or not. If it is determined that the UPS 1 is not to be stopped, the process returns to step S4, and it is determined in step S4 that the magnitude of the main output current has become less than a predetermined threshold value, or if the UPS 1 is stopped in step S5. Until the determination is made, the processes of steps S4 and S5 are repeatedly executed.

  In step S5, for example, the user inputs a command to command the UPS 1 to be stopped via the external interface 21 from an external device connected to the external terminal ET1 by turning off the power switch of the UPS 1 (not shown). Or when the input power becomes abnormal and the UPS 1 starts backup operation and a predetermined backup time has elapsed, the CPU 19 determines to stop the UPS 1 and the process proceeds to step S8.

  In step S4, when it is determined that the magnitude of the current output from the main output terminal is less than a predetermined threshold (sub-output permission value), for example, in the timing chart of FIG. 4, the personal computer 51 at time t4. If the power is turned off, the process proceeds to step S6.

  In step S6, the CPU 19 turns off the sub switch. As a result, the output of power from the sub output terminal is stopped (the sub output is turned off), and the power supply of the peripheral device 52 is turned off. For example, in the timing chart of FIG. 4, the sub output and the peripheral device 52 are in a state at time t5 when the power of the peripheral device 52 is turned off. Therefore, by turning off the power of the personal computer 51 connected to the main output terminal, it is possible to automatically turn off the power of the peripheral device 52 connected to the sub output terminal. Thereafter, the process proceeds to step S7.

  It should be noted that a predetermined delay time may be provided after the magnitude of the main output current becomes less than the sub output permission value until the output of power from the sub output terminal is stopped. The delay time may be set by the user.

  If it is determined in step S2 that the magnitude of the main output current is less than the predetermined threshold (sub-output permission value), that is, if the personal computer 51 is turned off, the processes in steps S3, S4, and S6 are performed. Skipped and the process proceeds to step S7.

  In step S7, it is determined whether the UPS 1 is to be stopped by the same processing as in step S5. When it is determined that the UPS 1 is not stopped, the process returns to step S2, and the processes after step S2 described above are executed.

  If it is determined in step S7 that the UPS 1 is to be stopped, the process proceeds to step S8.

  In step S8, the CPU 19 stops the UPS 1 and the power output control process ends. Specifically, the CPU 19 turns off the main switch, and turns off the sub switch when the sub switch is on. Further, when the UPS 1 is in the backup operation, the CPU 19 stops the processing of the inverter 14 and switches the switch 15 to the line 12 side.

  In this way, the inrush current that flows when starting the load device connected to the UPS 1 is suppressed. Also, by turning off the power supply of the load device connected to the main output terminal of the UPS 1, the power supply of the load device connected to the sub output terminal can be automatically turned off.

  In the above description, an example in which the number of UPS output terminals (for example, output terminals OT1 and OT2) and switches corresponding to the output terminals (for example, switches 17 and 18) is two has been described. You may make it. When three or more output terminals are provided, for example, when a predetermined delay time has elapsed since the magnitude of the output current output from the output terminal A exceeds a predetermined threshold, the power from the next output terminal B The output is started, and when a predetermined delay time has elapsed since the magnitude of the output current output from the output terminal B becomes equal to or greater than a predetermined threshold value, the output of power from the next output terminal C is further started. In addition, the inrush current flowing through the UPS is suppressed by preventing the load devices connected to the different output terminals from starting simultaneously. When three or more output terminals are provided, for example, an output terminal that is not interlocked with the output of another output terminal may be provided, or a plurality of output terminals may be interlocked with the output of the same output terminal.

  In the above description, an example in which the present invention is applied to a UPS has been described. However, the present invention can be applied to a power supply apparatus that divides electric power into two or more outputs in addition to a UPS. .

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a network or a recording medium into a general-purpose personal computer or the like.

  In the present specification, the step of describing the program stored in the program storage medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series. Or the process performed separately is also included.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows one Embodiment of UPS to which this invention is applied. 3 is a flowchart for explaining a power output control process executed by the UPS of FIG. 1. It is a figure which shows the usage example of UPS of FIG. It is a timing chart which shows the example of the transition of the state of the load apparatus connected to UPS and UPS.

Explanation of symbols

1 UPS
16 Current detection part (current detection means)
17, 18 switch 19 CPU (output control means)
OT1, OT2 output terminals

Claims (4)

In a power supply device including a first output terminal and a second output terminal for outputting power to the outside,
Current detection means for detecting the magnitude of the output current output from the first output terminal;
When a predetermined time has elapsed since the magnitude of the output current becomes equal to or greater than a predetermined threshold, the output of power from the second output terminal is started, and the magnitude of the output current is less than the threshold. In the case, a power supply apparatus comprising: output control means for controlling to stop the output of power from the second output terminal. In a power output control method of a power supply device including a first output terminal and a second output terminal for outputting power to the outside,
Detecting the magnitude of the output current output from the first output terminal;
When a predetermined time has elapsed since the magnitude of the output current becomes equal to or greater than a predetermined threshold, the output of power from the second output terminal is started, and the magnitude of the output current is less than the threshold. A power output control method including a step of controlling to stop the output of power from the second output terminal. In an uninterruptible power supply comprising a first output terminal and a second output terminal for outputting power to the outside,
Current detection means for detecting the magnitude of the output current output from the first output terminal;
When a predetermined time has elapsed since the magnitude of the output current becomes equal to or greater than a predetermined threshold, the output of power from the second output terminal is started, and the magnitude of the output current is less than the threshold. An uninterruptible power supply comprising: output control means for controlling to stop the output of power from the second output terminal. In the power output control method of the uninterruptible power supply device including the first output terminal and the second output terminal for outputting power to the outside,
Detecting the magnitude of the output current output from the first output terminal;
When a predetermined time has elapsed since the magnitude of the output current becomes equal to or greater than a predetermined threshold, the output of power from the second output terminal is started, and the magnitude of the output current is less than the threshold. A power output control method including a step of controlling to stop the output of power from the second output terminal.

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