KR102108692B1 - Control device for uninterruptible power supply - Google Patents

Abstract

The present invention relates to a control device for an uninterruptible power supply (UPS) to prevent overcharging of a storage battery. According to the present invention, the control device for a UPS includes the storage battery and supplies power stored in the storage battery to a load side in power failure of a commercial power line. The control device comprises: a temperature sensor installed in the storage battery or on one side of the storage battery to detect the temperature of the storage batery; a switching means opening a charging line of the storage battery when the temperature of the storage battery detected by the temperature sensor is increased more than an upper limit value and closing the charging line of the storage battery when the temperature of the storage battery is decreased less than a lower limit value; a notification means repeatedly outputting a first open notification sound at a predetermined time interval when the charging line is operated by the switching means as the temperature of the storage battery is increased more than the upper limit value and repeatedly outputting a first closing notification sound at a predetermined time interval when the charging line is closed by the switching means as the temperature of the storage battery is decreased less than the lower limit value; and a discharging diode connected and normally biased to a discharging direction of the storage battery in parallel to the charging line of the storage battery, supplying the power of the storage battery to a UPS side, and preventing the charging power from being abandoned from the UPS side to a storage battery side.

Description

Control device for uninterruptible power supply

The present invention relates to a control device for an uninterruptible power supply.

In general, an uninterruptible power supply (UPS) is a device that supplies uninterrupted power to a load such as a server device or subway screen door that must be constantly powered. Normally, a storage battery is installed in the uninterruptible power supply, and the power stored in the storage battery is supplied to the load side in the event of a power failure of a power line input to the uninterruptible power supply.

In the conventional uninterruptible power supply, the storage battery was charged in two modes. In general, the storage battery is charged by a floating charging method in which a plurality of cells are connected in series, a charging voltage is set, and charging and discharging of the storage battery are repeated in response to a change in current flowing through the storage battery. However, since the voltage difference per cell occurs when such floating charging is performed for a long time, equal charging is performed once every several months for the purpose of reducing the voltage deviation per cell. The uniform charging method is a method of charging the entire cell evenly by forcibly applying a voltage per cell for a predetermined period of time compared to the floating charging method. After the time set by the timer, the battery returns to the floating charging mode from the uniform charging mode again to save the battery. It will be charged.

For example, the charging voltage per cell is set to approximately 1.34V / Cell in the floating charging method, whereas the charging voltage per cell is set to approximately 1.42V / Cell in the uniform charging method.

However, while charging the storage battery in the floating charging mode, when the temperature of the storage battery increases due to an increase in ambient temperature or a delay in replacement of the electrolyte, the charging current of each cell rises, and accordingly the charging voltage decreases to compensate for this. There is a frequent occurrence of overcharge of the storage battery. The overcharging of the storage battery is the biggest cause of shortening the life of the storage battery, leading to problems such as uninterruptible power supply not being provided due to the unexpected shortening of the storage life.

In addition, conventionally, a control device for controlling to prevent overcharging of a storage battery according to a temperature or capacity value of the storage battery has been disclosed. However, the conventional control device for an uninterruptible power supply has a problem in that management of the control device is cumbersome and difficult to grasp in real time because it is difficult for an administrator to immediately know an open state of a charging line for charging a storage battery.

Registered Patent Publication No. 10-1875536 (Publication date 2018.07.06)

The present invention was created to solve the above problems, the object of the present invention is to detect the temperature rise of the storage battery and control to prevent overcharging of the storage battery according to the detected temperature value, as well as the administrator to immediately overcharge the state. An object of the present invention is to provide a control device for an uninterruptible power supply that can be recognized and improve management efficiency.

A control device for an uninterruptible power supply provided with an uninterruptible power supply device having a storage battery and supplying power stored in the storage battery to a load side in the event of a power failure of a commercial power line, installed inside or on one side of the storage battery to detect the temperature of the storage battery temperature Senser; Switching means for opening the charging line of the storage battery when the temperature of the storage battery detected by the temperature sensor rises above the upper limit setting value and closing the charging line of the storage battery when the temperature of the storage battery falls below the lower limit setting value; When the charging line is opened by the switching means as the temperature of the storage battery rises above the upper limit, the first opening notification sound is repeatedly output for a certain period of time, and as the temperature of the storage battery falls below the lower limit set value A notification means for outputting a first closing notification sound when the charging line is closed by the switching means; And a discharge diode that is connected in a forward bias to the discharge direction of the storage battery in parallel with the charging line of the storage battery, and supplies the power of the storage battery to the uninterruptible power supply, but blocks the charging power from being discharged from the uninterruptible power supply to the storage. ;.

In the control device for an uninterruptible power supply according to an embodiment of the present invention, the temperature sensor is a thermal switch, and the switching means may include a switching element that opens and closes the charging line of the storage battery by opening and closing the thermal switch.

In the control device for an uninterruptible power supply according to an embodiment of the present invention, a level sensor for detecting the height of the electrolyte contained in the battery is further installed inside the battery, and the switching means has a level of the electrolyte detected by the level sensor. When it rises above the reference value, the charging line of the storage battery is opened, and when the level of the electrolyte falls below the reference value, the charging line of the storage battery is switched to close, and the notification means switches the switching means as the level of the electrolyte rises above the reference value. When the charging line is opened by, the second opening notification sound is repeatedly output over a period of time, and when the charging line is closed by the switching means as the level of the electrolyte decreases below the reference value, the second closing notification Can output sound.

The present invention detects a temperature rise of the storage battery and controls to prevent overcharging of the storage battery according to the detected temperature value, and also allows an administrator to immediately recognize the overcharge state, thereby improving management efficiency.

According to the present invention, since the administrator can visually recognize the open or closed state of the charging line more easily through the display means together with the notification sound through the notification means, the convenience of management can be further increased.

1 is a configuration diagram schematically showing a control device for an uninterruptible power supply according to the present invention.
2 is a circuit diagram showing an embodiment of a switching means in the present invention.
3 is a circuit diagram showing a drive signal generating unit of the switching means in the present invention.
4 is a circuit diagram showing an embodiment of a driving power generator in the present invention.
5 is a block diagram showing the operating state of the control device for an uninterruptible power supply according to the present invention.

Hereinafter, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the numbers used in the description process of this specification are only identification symbols for distinguishing one component from other components.

In addition, the terms used in the present specification and claims should not be construed as being limited to a dictionary meaning, and based on the principle that the inventor can properly define the concept of terms to explain his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in this specification is only a preferred embodiment of the present invention, and does not express all of the technical spirit of the present invention, and various equivalents that can replace them at the time of this application It should be understood that water and variations may exist.

The preferred embodiments of the present invention will be described in more detail, but the technical parts that have already been well-known will be omitted or compressed for the sake of brevity.

1 is a configuration diagram schematically showing a control device for an uninterruptible power supply in the present invention, FIG. 2 is a circuit diagram showing an embodiment of a switching means in the present invention, and FIG. 3 is a driving signal generator of the switching means in the present invention 4 is a circuit diagram showing an embodiment of a driving power generator in the present invention, and FIG. 5 is a configuration diagram showing an operating state of a control device for an uninterruptible power supply according to the present invention.

A control device for an uninterruptible power supply provided with an uninterruptible power supply device (10) having a storage battery (12) and supplying power stored in the storage battery (12) to a load side when a commercial power line is cut off, the storage battery (12) A temperature sensor 14 installed inside or on one side to detect the temperature of the storage battery 12; When the temperature of the storage battery 12 detected by the temperature sensor 14 rises above the upper limit set value, the charging line of the storage battery 12 is opened, and when the temperature of the storage battery 12 falls below the lower limit set value, the storage battery 12 ) The switching means 16 for closing the charging line; When the charging line is opened by the switching means 16 as the temperature of the storage battery 12 rises above the upper limit set value, a first opening notification sound is output, and the temperature of the storage battery 12 is lower than or equal to the lower limit setting value. When the charging line is closed by the switching means 16 as it goes down to the notification means 30 for outputting a first closing notification sound; And a forward bias connection to the discharge direction of the storage battery 12 in parallel with the charging line of the storage battery 12, and supplying the power of the storage battery 12 to the uninterruptible power supply side, but the storage battery 12 at the uninterruptible power supply side. It includes; a discharge diode for blocking the charging power is induced to the side.

In the control device for an uninterruptible power supply according to an embodiment of the present invention, the temperature sensor 14 is a thermal switch, and the switching means 16 opens and closes the charging line of the storage battery 12 by opening and closing the thermal switch. It may include a switching element.

In the control device for an uninterruptible power supply according to an embodiment of the present invention, a level sensor for detecting the height of the electrolyte contained in the storage battery 12 is further installed inside the storage battery 12, and the switching means 16 is the When the level of the electrolyte detected by the level sensor rises above the reference value, the charging line of the storage battery 12 is opened, and when the level of the electrolyte decreases below the reference value, the charging line of the storage battery 12 is closed, and the notification means 30, when the filling line is opened by the switching means 16 as the level of the electrolyte rises above a reference value, a second opening notification sound is output, and as the level of the electrolyte falls below the reference value When the charging line is closed by the switching means 16, a second closing notification sound may be output.

1 is a schematic view showing an overcharge control device according to the present invention, and for convenience of understanding, the uninterruptible power supply and a storage battery are conceptually illustrated for convenience. Referring to this, the control device for an uninterruptible power supply of the present invention is attached to an existing uninterruptible power supply 10, and a temperature sensor 14 for detecting the temperature of the storage battery 12 inside or on one side of the storage battery 12 Is installed. In addition, a level sensor 15 for detecting the height of the electrolyte may be further installed inside each storage battery 12. The detection signals of the temperature sensor 14 and the level sensor 15 are transmitted to the switching means 16 that opens and closes the charging line of the storage battery 12. The switching means 16 opens the charging line for supplying charging power from the uninterruptible power supply 10 to the storage battery 12 side when the temperature of the storage battery 12 detected by the temperature sensor 14 rises above the upper limit set value. , When the detection temperature falls below the lower limit, the battery is switched to close the charging line of the storage battery. Similarly, the switching means 16 may be switched to open the filling line when the level of the electrolyte detected by the level sensor 15 rises above the reference value, and close the filling line when the level of the electrolyte falls below the reference value. .

On the other hand, even if the charging of the storage battery 12 is blocked by the switching means 16, the discharge line that supplies the power stored in the storage battery 12 to the side of the uninterruptible power supply 10 when the commercial power line is cut off must remain alive. To this end, the discharge line of the storage battery 12 is constituted in parallel with the charging line of the storage battery 12, and a discharge diode 18 forward-disconnected in the discharge direction is installed on the discharge line. Preferably, the discharging diode 18 is installed at a relatively high rating to block the supply of charging power from the uninterruptible power supply 10 side to the storage battery 12 side through the discharge line.

In the present invention, the temperature sensor 14, the level sensor 15 and the switching means 16 can be configured in various ways. 2 to 4 is a circuit diagram showing an embodiment of the present invention. Referring to this, the configuration and operation of the present invention will be described in more detail as follows.

Referring to the circuit diagram of FIG. 2, the switching means 16 receives and receives a signal from the temperature sensor 14 to open and close the charging line of the storage battery 12, and may be composed of various switching elements. On the other hand, although not shown, the switching means 16 may be operated to open and close the charging line by receiving the signals of the temperature sensor 14 and the level sensor 15 in parallel. As shown, in this embodiment, the switching means 16 is a MOSFET, a driving signal is applied from the temperature sensor 14 to the gate terminal of the MOSFET, and the drain terminal and the source terminal are respectively charged with the uninterruptible power supply 10. The line and the positive potential terminal of the storage battery 12 are connected. At this time, it is also possible to configure the switching means 16 with a single MOSFET, but preferably, by connecting a pair of MOSFETs (Q1, Q2) in parallel as shown in Figure 2 to disperse the switching current, relatively high It is configured to protect MOSFETs that are vulnerable to current. Even in this case, a driving signal applied from the temperature sensor 14 is transmitted to the gate terminals of each of the MOSFETs Q1 and Q2, and the drain line and the source terminal are charged to the uninterruptible power supply 10 and the storage battery 12, respectively. The positive potential terminal of is connected.

The driving signals applied to the respective MOSFETs Q1 and Q2 are generated from the temperature sensor 14, and FIG. 3 shows such a driving signal generating circuit. Referring to FIG. 3, the temperature sensor 14 is a thermal switch, and in this embodiment, the thermal switch is normally turned off, and then switched to an on state when the temperature of the storage battery 12 rises above the upper limit set value. When the temperature of the storage battery 12 again falls below the lower limit set value, it returns to the off state. For example, the thermal switch may be bimetallic. In addition, the thermal switch may be composed of a combination of a temperature sensor and a contact switch. In this embodiment, the upper limit setting value of the storage battery 12 temperature is 40 ° C, and the lower limit setting value is set to 30 ° C. Of course, the upper limit and lower limit may be set differently due to factors such as capacity and specification of the storage battery 12.

In the circuit diagram of FIG. 3, when the thermal switch is turned off, that is, when the temperature of the storage battery 12 is normal, the driving power of DC 12V is through the diode D2 and the inductor L1 of the MOSFET (Q1, Q2) gate terminal of FIG. Is applied to. At this time, as shown, a light emitting diode D3 indicating normal operation may be installed on the driving power supply side. Referring to the circuit diagram of FIG. 2, when a driving signal is applied to the gate terminals of each of the MOSFETs Q1 and Q2, the charging power of the uninterruptible power supply 10 is applied to the storage battery 12 while the MOSFETs Q1 and Q2 are driven. do. That is, the storage battery 12 is normally charged.

If the temperature of the storage battery 12 rises above the upper limit, the thermal switch is turned on, and the driving power of DC 12V is bypassed to the ground side through the thermal position. Therefore, the driving signals applied to the gate terminals of each of the MOSFETs Q1 and Q2 are blocked, and the MOSFETs Q1 and Q2 stop driving. That is, while the charging power supplied to the storage battery 12 is cut off, charging of the storage battery 12 is stopped. As mentioned above, even if the charging line of the storage battery 12 is blocked by the MOSFETs Q1 and Q2, the discharge of the storage battery 12 is normally performed, and thus the storage battery 12 in an emergency situation such as a power failure of the commercial power line Power stored in) is normally supplied to the uninterruptible power supply 10.

When each of the MOSFETs Q1 and Q2 stops driving, if the temperature of the storage battery 12 falls below the lower limit, the thermal switch is turned off again, and the driving power is normally restored to the gate terminals of the MOSFETs Q1 and Q2. This is supplied, and the storage battery 12 starts normal charging again.

Subsequently, referring to the circuit diagram of FIG. 2, an inductor that protects the MOSFETs Q1 and Q2 from a high switching current is installed between the drain terminals of each MOSFET Q1 and Q2 and the charging line of the uninterruptible power supply 10. . In addition, between the source terminals of each of the MOSFETs Q1 and Q2 and the positive potential terminal of the storage battery 12, a diode 20 for constant voltage compensation that is forward-biased in the charging direction of the storage battery 12 is installed.

4 is a circuit diagram showing a circuit configuration for generating driving power for the MOSFETs Q1 and Q2. Referring to this, the MOSFET (Q1, Q2) driving power generator includes a bridge diode (D1) rectifying commercial power, a capacitor (C3) connected in parallel to the bridge diode output terminal to remove noise, a constant voltage regulator (U1), and current smoothing Capacitor C4 for is configured in combination. Needless to say, the driving power generator may be configured with other general constant voltage circuits.

The control device for the uninterruptible power supply device of the present invention as described above detects the temperature rise of the storage battery 12 by the temperature sensor 14, and when the temperature of the storage battery 12 rises above the upper limit set value, the uninterruptible power supply device 10 By blocking the charging line of) to forcibly block charging of the storage battery 12, it is prevented that the storage battery 12 is overcharged by an abnormal increase in the charging current. Therefore, the phenomenon of shortening of the lifespan due to overcharging of the storage battery 12 is prevented, and the lifespan of the storage battery 12 is completely preserved to enable stable uninterrupted supply. An advantage of the present invention is that it is attached to the existing uninterruptible power supply 10 and uses the uninterruptible power supply 10 that has been conventionally used. In addition, the overcharge control device for the uninterruptible power supply of the present invention has an advantage of forming a discharge line separately from the charging line even if the charging of the storage battery 12 is forcibly blocked, so that the discharge of the storage battery 12 is normally performed. In addition, the control device for an uninterruptible power supply according to the present invention detects the level of the electrolyte in the battery 12 by the level sensor 15 in parallel with detecting the temperature of the battery 12 by the temperature sensor 14. It may be operated to block the charging of the storage battery 12 when the level of the electrolyte is raised above a reference value.

Meanwhile, referring to FIG. 5, according to the present invention, the notification means 30 may repeatedly output a first closed notification sound or a second closed notification sound at regular intervals. Accordingly, the administrator can easily recognize that the charging line is closed through the first closed notification sound or the second closed notification sound that is repeatedly output, thereby increasing the convenience of management.

In addition, the present invention is installed on one side of the storage battery 12, in addition to the notification sound output through the notification means 30, when the charging line is opened or closed by the switching means 16, a display for visually displaying it Means 40 may be further included. The display means 40 is provided with an LED lighting, when the charging line is opened through the lighting or flashing of the LED lighting, the lighting of the LED is made, and when the charging line is closed, the LED lighting can be blinked. . Accordingly, the present invention further enhances the convenience of management because the administrator can visually recognize the open or closed state of the charging line more easily through the display means 40 together with the notification sound through the notification means 30. It becomes possible.

Additionally, when the charging line is closed through the switching means 16, the present invention may further include recording means 50 for counting and recording the number of closed times during a certain period.

Through this recording means 50, the number of times the charging line is closed for a certain period of time and the number of overcharges corresponding to it can be accurately known, so that the manager can efficiently manage the control device.

In addition, the recording means 50 is a first count unit for counting the number of times the charging line is closed by the switching means 16 as the temperature of the storage battery 12 decreases below the lower limit set value through the temperature sensor 14, The second count unit counts the number of times the charging line is closed by the switching means 16 as the level of the electrolyte decreases below the reference value through the level sensor 15, and is charged through the first count unit and the second count unit A third count unit for counting the case where the filling line is closed may be included, except for the number of times the line is closed.

Accordingly, the recording means 50 accurately checks whether the charging line is closed by the detection of one of the temperature sensor 14 and the level sensor 15 or the charging line is closed by another element. This allows the administrator to efficiently manage the control device.

As described above, although the detailed description of the present invention has been made by examples, it is understood that the present invention is limited only to the above-described embodiments, since the above-described embodiments are merely described as preferred examples of the present invention. It should not be lost, and the scope of the present invention should be understood as the following claims and equivalent concepts.

10: Uninterruptible power supply
12: storage battery
14: temperature sensor
15: level sensor
16: Switching means
18: discharge diode
20: constant voltage compensation diode
30: notification means
40: display means
50: recording means

Claims (3)

In the control device for an uninterruptible power supply having a storage battery, attached to the uninterruptible power supply that supplies power stored in the storage battery to the load side in the event of a power failure of a commercial power line,
A temperature sensor installed inside or on one side of the battery to detect the temperature of the battery;
Switching means for opening the charging line of the storage battery when the temperature of the storage battery detected by the temperature sensor rises above the upper limit set value and closing the charging line of the storage battery when the temperature of the storage battery falls below the lower limit set value;
When the charging line is opened by the switching means as the temperature of the storage battery rises above the upper limit set value, a first opening notification sound is output, and as the temperature of the storage battery falls below the lower limit set value, the switching means When the charging line is closed, the notification means for repeatedly outputting the first closing notification sound for a predetermined time; And
A discharge diode that is connected in a forward bias to the discharge direction of the battery in parallel with the charging line of the battery, and supplies the power of the battery to the uninterruptible power supply side, but blocks discharge of charging power from the uninterruptible power supply side to the storage side; It includes,
The temperature sensor is a thermal switch, and the switching means includes a switching element that opens and closes the charging line of the storage battery by opening and closing the thermal switch,
A level sensor for detecting the height of the electrolyte contained in the storage battery is further installed inside the storage battery, and the switching means opens the charging line of the storage battery when the level of the electrolyte detected by the level sensor rises above a reference value, and opens the level of the electrolyte. If it falls below this standard, the battery is switched to close the charging line.
The notification means outputs a second opening notification sound when the charging line is opened by the switching means as the level of the electrolyte rises above a reference value, and the switching means as the level of the electrolyte decreases below a reference value. When the charging line is closed by, the second closing notification sound is repeatedly output over a period of time,
When it is installed on one side of the storage battery and the charging line is opened or closed by the switching means, it further includes display means for visually displaying it,
The display means is configured such that the LED lighting is provided so that when the charging line is opened, the LED lighting is turned on, and when the charging line is closed, the LED lighting is blinking.
Further comprising a recording means for counting and recording the number of times the charging line of the storage battery is closed,
The recording means,
A first counting unit counting the number of times the charging line is closed by the switching means as the temperature of the storage battery decreases below the lower limit set value through the temperature sensor;
A second counting unit counting the number of times the charging line is closed by the switching means as the level of the electrolyte decreases below the reference value through the level sensor; And
And a third counting unit counting when the charging line is closed, except for the number of times counted through the first counting unit and the second counting unit.
Control device for uninterruptible power supply. delete delete

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