JP2021164335A - Uninterruptible power supply device - Google Patents

Uninterruptible power supply device Download PDF

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JP2021164335A
JP2021164335A JP2020065991A JP2020065991A JP2021164335A JP 2021164335 A JP2021164335 A JP 2021164335A JP 2020065991 A JP2020065991 A JP 2020065991A JP 2020065991 A JP2020065991 A JP 2020065991A JP 2021164335 A JP2021164335 A JP 2021164335A
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power failure
secondary battery
load device
power supply
discharge
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JP7469110B2 (en
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佑亮 草茅
Yusuke Kusagaya
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FDK Corp
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Abstract

To provide means for detecting power failures instantaneously and reliably in an uninterruptible power supply device, and to achieve this at a low cost.SOLUTION: Power failure detection means is configured to include a voltage detection unit 11, which detects a potential difference between the two sides of a first rectifying element 7 and a power failure determination unit that determines the state of power failure on the basis of the potential difference detected by the voltage detection unit 11. The power failure determination unit is configured to determine that it is a power failure when a voltage on the secondary battery 1 side of the first rectifier element 11 is higher than a voltage on the load device 21 side.SELECTED DRAWING: Figure 1

Description

本発明は、無停電電源装置に関し、特に、停電検出装置を有するものに関する。 The present invention relates to an uninterruptible power supply, and more particularly to a device having a power failure detection device.

外部電源に接続された負荷装置に、停電時にバックアップのため電力を供給する二次電池を備えた無停電電源装置は、例えば、特許文献１から知られている。このような無停電電源装置には、停電しても負荷装置への電力供給が止まらないよう、停電の発生を検知する停電検出手段が設けられ、停電状態を検出すると、すぐに二次電池からの放電を開始し、負荷装置に電力を供給するようになっている。 An uninterruptible power supply device including a secondary battery that supplies power to a load device connected to an external power supply for backup in the event of a power failure is known from, for example, Patent Document 1. Such an uninterruptible power supply is provided with a power failure detecting means for detecting the occurrence of a power failure so that the power supply to the load device does not stop even if the power failure occurs. Is started to discharge and power is supplied to the load device.

従来の、停電検出手段としては、外部電源に接続され、外部電源から電力を供給して二次電池を充電するための充電ラインの電圧を監視し、この電圧が停電時に低下するのを検知して停電であることを判定するものが知られている。しかし、この停電検出手段においては、停電を検出したあと、二次電池から負荷装置に電力を供給するよう切り替えると、充電ラインが二次電池の出力側と接続されているため、充電ラインの電圧はまたすぐに正常電圧に復帰してしまう。そのため、停電状態であるにもかかわらず、非停電状態であると判定されてしまうことになり好ましくない。例えば、停電が解消して商用電力が復帰しても、そのことを検出することができない。 As a conventional power failure detection means, the voltage of the charging line connected to an external power source and supplied with power from the external power source to charge the secondary battery is monitored, and it is detected that this voltage drops during a power failure. There are known ones that determine that there is a power outage. However, in this power failure detecting means, when the power is supplied from the secondary battery to the load device after the power failure is detected, the charging line is connected to the output side of the secondary battery, so that the voltage of the charging line is high. Will soon return to normal voltage. Therefore, even though it is in a power failure state, it is determined that it is in a non-power failure state, which is not preferable. For example, even if the power outage is resolved and the commercial power is restored, that cannot be detected.

また、上記の停電検出手段に加えて、又はそれに代えて、二次電池の放電電流を監視して停電を検出することも行われているが、電流検知による停電の検出は、電圧検知による場合に比較して、停電発生から検出まで時間がかかり瞬停を検出できない場合があった。また、負荷装置の電力消費が小さい場合には、放電電流も小さく、停電検出を確実に行うことがむつかしいという問題もあった。 Further, in addition to or instead of the above-mentioned power failure detection means, the discharge current of the secondary battery is monitored to detect the power failure, but the detection of the power failure by the current detection is the case of voltage detection. In some cases, it took a long time from the occurrence of a power failure to the detection, and the momentary power failure could not be detected. Further, when the power consumption of the load device is small, the discharge current is also small, and there is a problem that it is difficult to reliably detect a power failure.

特開２０１６−１０２８８JP 2016-10288

本発明は、上記のような課題を解決するためなされたものであり、確実にかつ瞬時に停電を検出することができ、しかも安価な停電検出手段を提供することを目的とする。 The present invention has been made to solve the above problems, and an object of the present invention is to provide an inexpensive power failure detecting means capable of reliably and instantly detecting a power failure.

本発明は、
停電時に、外部電源に接続された負荷装置に電力を供給する二次電池と、
非停電時に、前記外部電源から電力の供給を受けて前記二次電池を充電する充電回路と、
前記二次電池から電力を前記負荷装置に放電する放電ライン上に設けられ、非停電時には当該放電ラインを遮断する開位置と停電時には当該放電ラインを導通させる閉位置とを有するスイッチ要素と、
前記放電ラインにおいて前記スイッチ要素と前記二次電池の間に直列的に設けられ、前記二次電池から前記負荷装置への向きの電流を選択的に通過させる第一の整流要素と、
前記スイッチ要素が開位置にある非停電時において前記負荷装置に接続された前記外部電源の電圧が前記第一の整流素子の前記負荷装置側に印加できるようにする素子であって、前記スイッチ要素と並列に設けられ、前記負荷装置から前記二次電池への向きの電流を選択的に通過させる第二の整流要素と、
停電時であることを検出する停電検出手段と、
を備え、
前記停電検出手段は、
前記第一の整流要素の両側の電位差を検知する電圧検知部と、
前記電圧検知部で検出した電位差に基づいて停電の状態を判定する停電判定部と、を備え、
前記停電判定部は、前記第一の整流要素の前記二次電池側の電圧が前記負荷装置側の電圧より高い場合に、停電時であると判定するよう構成されている、
無停電電源装置である。 The present invention
A secondary battery that supplies power to the load device connected to the external power supply in the event of a power outage,
A charging circuit that charges the secondary battery by receiving power from the external power source during a non-power failure.
A switch element provided on a discharge line that discharges electric power from the secondary battery to the load device, and has an open position that shuts off the discharge line during a non-power failure and a closed position that conducts the discharge line during a power failure.
A first rectifying element provided in series between the switch element and the secondary battery in the discharge line and selectively passing a current in the direction from the secondary battery to the load device.
An element that enables the voltage of the external power supply connected to the load device to be applied to the load device side of the first rectifying element when the switch element is in the open position during a non-power failure, and is the switch element. A second rectifying element, which is provided in parallel with the load device and selectively passes a current in the direction from the load device to the secondary battery.
A power failure detection means that detects the time of a power failure,
With
The power failure detecting means is
A voltage detection unit that detects the potential difference on both sides of the first rectifying element, and
A power failure determination unit that determines a power failure state based on the potential difference detected by the voltage detection unit is provided.
The power failure determination unit is configured to determine that a power failure has occurred when the voltage on the secondary battery side of the first rectifying element is higher than the voltage on the load device side.
It is an uninterruptible power supply.

本発明によれば、放電ライン上に設けられた第一の整流要素の両側の電位差は、非停電時には、この第一の整流要素の負荷装置側の電圧が二次電池側の電圧より高いものであるところ、停電時には、負荷装置側の電圧がゼロに低下するため、第一の整流要素の負荷装置側の電圧が二次電池側の電圧より低くなり、このため、前記電位差の正負を判定することにより、停電になった瞬間や非停電状態に戻った瞬間、さらには停電状態にあることなどを確実に検出することができる。 According to the present invention, the potential difference on both sides of the first rectifying element provided on the discharge line is such that the voltage on the load device side of the first rectifying element is higher than the voltage on the secondary battery side during non-power failure. However, in the event of a power failure, the voltage on the load device side drops to zero, so the voltage on the load device side of the first rectifying element becomes lower than the voltage on the secondary battery side, and therefore the positive or negative of the potential difference is determined. By doing so, it is possible to reliably detect the moment of a power failure, the moment of returning to a non-power failure state, and the fact that the power is in a power failure state.

この場合、前記停電検出手段は、前記二次電池からの放電電流を検出する電流検知部をさらに備え、前記停電判定部は、停電時であるとの判定下で前記電流検知部で検出された放電電流が所定の値を下回る場合には、前記負荷装置は停止していると判定するよう構成されているのが好ましい。 In this case, the power failure detection means further includes a current detection unit that detects the discharge current from the secondary battery, and the power failure determination unit is detected by the current detection unit under the determination that it is during a power failure. When the discharge current is less than a predetermined value, it is preferable that the load device is configured to be determined to be stopped.

従来、停電下において、負荷装置の稼働状態を把握するため、負荷装置から稼働状態を示す信号を無停電電源装置の制御装置に出力するように構成しているところ、上記のような構成により、負荷装置からの信号を用いることなく、負荷装置の稼働状態を管理することができる。特に、放電電流を検出する電流検知部を、従来から用いられている、充電電流や放電電流を管理するための充放電電流計を流用することにより、負荷装置からの上記信号のための配線を省くことができ極めて安価にこれを実現することができる。 Conventionally, in order to grasp the operating state of the load device under a power failure, the load device is configured to output a signal indicating the operating state to the control device of the uninterruptible power supply device. The operating state of the load device can be managed without using the signal from the load device. In particular, by diverting the charge / discharge ammeter for managing the charge current and the discharge current, which has been conventionally used, to the current detector for detecting the discharge current, the wiring for the above signal from the load device can be provided. This can be omitted and can be achieved at extremely low cost.

ここで、前記停電検出手段は、前記二次電池の充放電を制御して少なくとも充電処理及び放電処理を行う充放電制御部を備え、前記停電判定部は、前記充放電制御部に設けられているのが好ましい。 Here, the power failure detecting means includes a charge / discharge control unit that controls the charge / discharge of the secondary battery to perform at least charge processing and discharge processing, and the power failure determination unit is provided in the charge / discharge control unit. It is preferable to have it.

また、前記充放電制御部はプロセッサを備え、前記停電判定部は、前記放電処理以外の処理中に前記電圧検知部から前記停電時に対応する信号を入力すると停電時であると判定し、前記プロセッサの割り込み機能を用いて前記放電処理を開始するよう構成されているのが、好ましい。 Further, the charge / discharge control unit includes a processor, and the power failure determination unit determines that a power failure occurs when a signal corresponding to the power failure is input from the voltage detection unit during a process other than the discharge process, and determines that the processor. It is preferable that the discharge process is started by using the interrupt function of the above.

本発明によれば、プロセッサの割り込み機能を用いるので、停電が発生すると、停電時に対応する信号をすぐにプロセッサに取り込み、同時に放電処理を開始できるので瞬停対策に好適である。 According to the present invention, since the interrupt function of the processor is used, when a power failure occurs, the signal corresponding to the power failure can be immediately taken into the processor and the discharge process can be started at the same time, which is suitable for measures against momentary power failure.

前記電流検知部は、前記外部電源、前記負荷装置及び前記二次電池に接続される共通の接地ラインに設けられているのが好ましい。また、前記スイッチ要素及び前記第二の整流要素を１つのMOSFETで構成するのが好ましい。さらに、前記外部電源は、外部電力で駆動される直流電源であるとよい。 The current detection unit is preferably provided on a common ground line connected to the external power supply, the load device, and the secondary battery. Further, it is preferable that the switch element and the second rectifying element are composed of one MOSFET. Further, the external power supply may be a DC power supply driven by external power.

図１は、本開示に係る無停電電源装置の実施形態を示す概略回路図である。FIG. 1 is a schematic circuit diagram showing an embodiment of an uninterruptible power supply according to the present disclosure.

図１に示すように、この実施形態の無停電電源装置１０は、停電時、外部電源２２に接続された負荷装置２１に電力を供給する二次電池１を備えている。ここで、外部電源２２は、商用の交流電源から電力の供給受け、負荷装置２１（例えば、サーバ-）に直流の電力を供給する。 As shown in FIG. 1, the uninterruptible power supply 10 of this embodiment includes a secondary battery 1 that supplies electric power to a load device 21 connected to an external power supply 22 in the event of a power failure. Here, the external power supply 22 receives power from a commercial AC power supply and supplies DC power to the load device 21 (for example, a server).

二次電池１は、通常、複数の二次電池セルを多直列に、又は、多直列かつ多並列に接続して構成される。本実施形態の場合、二次電池１の正極側は、充電ライン４を介して外部電源２２に接続されるとともに、充電ライン４と並列に配置された放電ライン３を介して負荷装置２１に接続される。 The secondary battery 1 is usually configured by connecting a plurality of secondary battery cells in multiple series or in multiple series and in multiple parallels. In the case of the present embodiment, the positive electrode side of the secondary battery 1 is connected to the external power supply 22 via the charging line 4 and is connected to the load device 21 via the discharge line 3 arranged in parallel with the charging line 4. Will be done.

充電ライン４上には、非停電時、すなわち、停電ではない時、前記外部電源２２から電力の供給を受けて二次電池１を充電するための充電回路８と、二次電池１に向かう向きの電流、すなわち充電電流だけを通過させる整流要素、例えばダイオード９が設けられる。 On the charging line 4, a charging circuit 8 for charging the secondary battery 1 by receiving power from the external power source 22 and a direction toward the secondary battery 1 when there is no power failure, that is, when there is no power failure. A rectifying element that allows only the current of the above, that is, the charging current, for example, a diode 9 is provided.

一方、放電ライン３上には、非停電時にこの放電ライン３を遮断する開位置と停電時に当該放電ライン３を導通させる閉位置とを有するスイッチ要素５と、二次電池１から負荷装置２１に向かう向きの電流、すなわち放電電流だけを選択的に通過させる第一の整流要素７とが設けられる。第一の整流要素７は、スイッチ要素５と直列に、スイッチ要素５の二次電池１側に接続される。 On the other hand, on the discharge line 3, a switch element 5 having an open position for shutting off the discharge line 3 during a non-power failure and a closed position for conducting the discharge line 3 during a power failure, and a secondary battery 1 to a load device 21 A first rectifying element 7 that selectively passes only the current in the direction of heading, that is, the discharge current is provided. The first rectifying element 7 is connected in series with the switch element 5 to the secondary battery 1 side of the switch element 5.

また、放電ライン３上にはスイッチ要素５と並列に第二の整流要素６が設けられる。第二の整流要素６により、スイッチ要素５が開位置にあるときでも、第一の整流要素７には、負荷装置２１の入力電圧（すなわち、負荷装置２１に接続された外部電源２２の供給電圧）が印加されるようになっている。
ここで、第一の整流要素７は、例えばダイオードで構成することができ、また、スイッチ要素５と第二の整流要素６との組み合わせを１つのMOSFETで構成することができる。
また、電圧検知器１１が、第一の整流要素７の両側の電位差を検知するために設けられている。 Further, a second rectifying element 6 is provided on the discharge line 3 in parallel with the switch element 5. Due to the second rectifying element 6, even when the switch element 5 is in the open position, the first rectifying element 7 has the input voltage of the load device 21 (that is, the supply voltage of the external power supply 22 connected to the load device 21). ) Is applied.
Here, the first rectifying element 7 can be composed of, for example, a diode, and the combination of the switch element 5 and the second rectifying element 6 can be composed of one MOSFET.
Further, a voltage detector 11 is provided to detect the potential difference on both sides of the first rectifying element 7.

二次電池１の負極側は接地ライン１３に接続される。接地ライン１３上には、電流検出部１２、例えば電流計が設けられ双方向の電流を測定できるようになっており、電流検出部１２は、二次電池１の充電時には充電電流を、二次電池１の放電時には放電電流を測定することができる。 The negative electrode side of the secondary battery 1 is connected to the ground line 13. A current detection unit 12, for example, a current meter, is provided on the ground line 13 to measure bidirectional current, and the current detection unit 12 charges the secondary battery 1 when charging the secondary battery 1. The discharge current can be measured when the battery 1 is discharged.

無停電電源装置１０には、二次電池１、充電装置８、ダイオード９、スイッチ要素５、第一の整流要素７、第二の整流要素６、及び電流計１１の他、二次電池１の充放電を制御する制御装置２も、備えられる。 The uninterruptible power supply 10 includes a secondary battery 1, a charging device 8, a diode 9, a switch element 5, a first rectifying element 7, a second rectifying element 6, a current meter 11, and a secondary battery 1. A control device 2 for controlling charging / discharging is also provided.

そして、電圧検知器１１により検出された、第一の整流要素７の両側の電位差を表す信号Ａは、制御装置２の入力ポート１５に入力される。また、電流検出器１２により検出された電流値を表す信号Ｂは制御装置２の入力ポート１６に入力される。そして、制御装置２の出力ポート１７からは、スイッチ要素５を開閉するための信号Ｃが出力される。
本実施形態では、制御装置２が二次電池１の充放電を制御するための充放電制御部２３を備え、充放電制御部２３にはプロセッサ２４が設けられる。 Then, the signal A representing the potential difference on both sides of the first rectifying element 7 detected by the voltage detector 11 is input to the input port 15 of the control device 2. Further, the signal B representing the current value detected by the current detector 12 is input to the input port 16 of the control device 2. Then, a signal C for opening / closing the switch element 5 is output from the output port 17 of the control device 2.
In the present embodiment, the control device 2 includes a charge / discharge control unit 23 for controlling the charge / discharge of the secondary battery 1, and the charge / discharge control unit 23 is provided with a processor 24.

この実施形態の無停電電源装置１０は、停電を検出するための停電検出手段を備え、この停電検出手段は、電圧検知器１１と、電圧検知器１１からの電位差の信号に基づいて停電の状態を判定する停電判定部とを備えて構成され、この停電判定部は、制御装置２内に配置された充放電制御部２３に設けられている。
本実施形態において、停電検出手段は、電流検出器１２をさらに備える。 The uninterruptible power supply 10 of this embodiment includes a power failure detecting means for detecting a power failure, and the power failure detecting means is in a power failure state based on a voltage detector 11 and a signal of a potential difference from the voltage detector 11. The power failure determination unit is provided in the charge / discharge control unit 23 arranged in the control device 2.
In the present embodiment, the power failure detecting means further includes a current detector 12.

次に、非停電時から停電時に移行する際の停電検出手段の動作について説明する。
非停電時においては、放電のためのスイッチ要素５は開放しているが、スイッチ要素５をバイパスして、スイッチ要素５と並列に設けられた第二の整流要素６を介して、電源装置２２の電圧が第一の整流要素７の負荷装置２１側に印加され、一方、第一の整流要素７の二次電池１側には、電源装置２２の電圧より低い二次電池１の電圧が印加されている。
本実施形態において、直流電源装置２２の電圧は、二次電池１の電圧より常に高くなるよう設定されており、このため、非停電時は、第一の整流要素７の両側の電圧は、負荷装置２１側が高く、二次電池１側が低い。このとき、電圧検知器１１からの信号Ａは、負荷装置２２の側の電圧から二次電池１の側の電圧を差し引いた電圧に比例するように設定させており、したがって、非停電時には信号Ａは正の値を表すものとなっている。 Next, the operation of the power failure detection means when shifting from a non-power failure to a power failure will be described.
In the non-power failure, the switch element 5 for discharging is open, but the power supply device 22 bypasses the switch element 5 and passes through the second rectifying element 6 provided in parallel with the switch element 5. Is applied to the load device 21 side of the first rectifying element 7, while the voltage of the secondary battery 1 lower than the voltage of the power supply device 22 is applied to the secondary battery 1 side of the first rectifying element 7. Has been done.
In the present embodiment, the voltage of the DC power supply device 22 is set to be always higher than the voltage of the secondary battery 1, and therefore, during non-power failure, the voltage on both sides of the first rectifying element 7 is loaded. The device 21 side is high, and the secondary battery 1 side is low. At this time, the signal A from the voltage detector 11 is set to be proportional to the voltage obtained by subtracting the voltage on the secondary battery 1 side from the voltage on the load device 22 side. Therefore, the signal A is set in the absence of a power failure. Represents a positive value.

一方、停電時には、電源装置２２の電圧はゼロになるので、第一の整流要素７の両側の電圧は、負荷装置２１側が低く、二次電池１側が高くなる。よって停電時の信号Ａは負の値を表すことになる。 On the other hand, in the event of a power failure, the voltage of the power supply device 22 becomes zero, so that the voltages on both sides of the first rectifying element 7 are low on the load device 21 side and high on the secondary battery 1 side. Therefore, the signal A at the time of power failure represents a negative value.

電圧値を表す信号Ａは、制御装置２の入力ポート１５に送信されるが、制御装置２内の充放電制御部２３のプロセッサ２４の割り込みポートは常に信号Ａの正負を表す信号（正負信号）を監視しており、この正負信号が正から負に転じたときは、プロセッサ２４の割り込み機能により、プロセッサ２４は、例えば充電処理を中断して、停電判定処理として、停電状態であると判定する処理を行い、プロセッサ２４が停電状態であると判定すると、制御装置２の充放電制御部２３は、制御装置２の出力ポート１７からスイッチ要素５を閉止させる信号Ｃを出力する。また、このとき、充放電制御部２３は、停電状態を表すランプを表示するなどの処理も行うことができる。 The signal A representing the voltage value is transmitted to the input port 15 of the control device 2, but the interrupt port of the processor 24 of the charge / discharge control unit 23 in the control device 2 is always a signal (positive / negative signal) indicating the positive or negative of the signal A. When the positive / negative signal changes from positive to negative, the processor 24 interrupts the charging process, for example, and determines that the power is in a power failure state as a power failure determination process by the interrupt function of the processor 24. When the processing is performed and the processor 24 is determined to be in a power failure state, the charge / discharge control unit 23 of the control device 2 outputs a signal C for closing the switch element 5 from the output port 17 of the control device 2. Further, at this time, the charge / discharge control unit 23 can also perform processing such as displaying a lamp indicating a power failure state.

逆に、停電が復帰し非停電状態になると、信号Ａの値は負になるので、プロセッサ２４は、非停電状態であると判定し、充放電制御部２３は、スイッチ要素５に信号Ｃを出力しスイッチ要素５を開放する。 On the contrary, when the power failure is restored and the power failure state is reached, the value of the signal A becomes negative. Therefore, the processor 24 determines that the power failure state is reached, and the charge / discharge control unit 23 sends the signal C to the switch element 5. Output and open the switch element 5.

上記のような動作をおこなう本実施形態の停電検出手段は、電圧検知器１１と、電圧検知器１１からの電位差の信号Ａに基づいて停電の状態を判定する停電判定部とを備えて構成され、上記の説明の通り、停電判定部の停電判定処理は充放電制御部２３に設けられたプロセッサ２４によって行われる。 The power failure detection means of the present embodiment that performs the above operation includes a voltage detector 11 and a power failure determination unit that determines a power failure state based on a potential difference signal A from the voltage detector 11. As described above, the power failure determination process of the power failure determination unit is performed by the processor 24 provided in the charge / discharge control unit 23.

ここで、停電検出手段は、停電時における負荷装置２１の稼働状態を監視する負荷装置監視部を備えることもできる。この場合、停電検出手段の荷装置監視部は、接地ライン１３に配置された電流検知部１２をも含む。電流検知部１２からの信号Ｂが出力され入力ポート１６を介して充放電制御部２３に入力される。信号Ｂは、停電時には、放電電流に比例する値を表すようになっている。そして、充放電制御部２３では、信号Ｂが所定の値を下回る場合には、負荷装置２１は停止していると判定するよう構成されている。これにより、負荷装置２１の稼働状態を監視することができる。 Here, the power failure detecting means may also include a load device monitoring unit that monitors the operating state of the load device 21 at the time of a power failure. In this case, the load device monitoring unit of the power failure detecting means also includes the current detecting unit 12 arranged on the grounding line 13. The signal B from the current detection unit 12 is output and input to the charge / discharge control unit 23 via the input port 16. The signal B represents a value proportional to the discharge current at the time of a power failure. Then, the charge / discharge control unit 23 is configured to determine that the load device 21 is stopped when the signal B falls below a predetermined value. As a result, the operating state of the load device 21 can be monitored.

１ 二次電池
２ 制御装置
３ 放電ライン
４ 充電ライン
５ スイッチ要素
６ 第二の整流要素
７ 第一の整流要素
８ 充電回路
９ ダイオード
１０ 無停電電源装置
１１ 電圧検出器
１２ 電流検出器
１３ 接地ライン
１５、１６ 入力ポート
１７ 出力ポート
２１ 負荷装置
２２ 電源装置
２３ 充放電制御部
２４ プロセッサ 1 Rechargeable battery 2 Control device 3 Discharge line 4 Charging line 5 Switch element 6 Second rectifying element 7 First rectifying element 8 Charging circuit 9 Diode 10 Uninterruptible power supply 11 Voltage detector 12 Current detector 13 Grounding line 15 , 16 Input port 17 Output port 21 Load device 22 Power supply device 23 Charge / discharge control unit 24 Processor

Claims (7)

停電時に、外部電源に接続された負荷装置に電力を供給する二次電池と、
非停電時に、前記外部電源から電力の供給を受けて前記二次電池を充電する充電回路と、
前記二次電池から電力を前記負荷装置に放電する放電ライン上に設けられ、非停電時には当該放電ラインを遮断する開位置と停電時には当該放電ラインを導通させる閉位置とを有するスイッチ要素と、
前記放電ラインにおいて前記スイッチ要素と前記二次電池の間に直列的に設けられ、前記二次電池から前記負荷装置への向きの電流を選択的に通過させる第一の整流要素と、
前記スイッチ要素が開位置にある非停電時において前記負荷装置に接続された前記外部電源の電圧が前記第一の整流素子の前記負荷装置側に印加できるようにする素子であって、前記スイッチ要素と並列に設けられ、前記負荷装置から前記二次電池への向きの電流を選択的に通過させる第二の整流要素と、
停電時であることを検出する停電検出手段と、
を備え、
前記停電検出手段は、
前記第一の整流要素の両側の電位差を検知する電圧検知部と、
前記電圧検知部で検出した電位差に基づいて停電の状態を判定する停電判定部と、を備え、
前記停電判定部は、前記第一の整流要素の前記二次電池側の電圧が前記負荷装置側の電圧より高い場合に、停電時であると判定するよう構成されている、
無停電電源装置。 A secondary battery that supplies power to the load device connected to the external power supply in the event of a power outage,
A charging circuit that charges the secondary battery by receiving power from the external power source during a non-power failure.
A switch element provided on a discharge line that discharges electric power from the secondary battery to the load device, and has an open position that shuts off the discharge line during a non-power failure and a closed position that conducts the discharge line during a power failure.
A first rectifying element provided in series between the switch element and the secondary battery in the discharge line and selectively passing a current in the direction from the secondary battery to the load device.
An element that enables the voltage of the external power supply connected to the load device to be applied to the load device side of the first rectifying element when the switch element is in the open position during a non-power failure, and is the switch element. A second rectifying element, which is provided in parallel with the load device and selectively passes a current in the direction from the load device to the secondary battery.
A power failure detection means that detects the time of a power failure,
With
The power failure detecting means is
A voltage detection unit that detects the potential difference on both sides of the first rectifying element, and
A power failure determination unit that determines a power failure state based on the potential difference detected by the voltage detection unit is provided.
The power failure determination unit is configured to determine that a power failure has occurred when the voltage on the secondary battery side of the first rectifying element is higher than the voltage on the load device side.
Uninterruptible power system. 前記停電検出手段は、前記二次電池からの放電電流を検出する電流検知部をさらに備え、前記停電判定部は、停電時であるとの判定下で前記電流検知部で検出された放電電流が所定の値を下回る場合には、前記負荷装置は停止していると判定するよう構成されている、請求項１に記載の無停電電源装置。 The power failure detecting means further includes a current detecting unit that detects a discharge current from the secondary battery, and the power failure determining unit uses the discharge current detected by the current detecting unit under the determination that a power failure has occurred. The uninterruptible power supply according to claim 1, wherein if the value is lower than a predetermined value, it is determined that the load device is stopped. 前記二次電池の充放電を制御して少なくとも充電処理及び放電処理を行う充放電制御部を備え、前記停電判定部は、前記充放電制御部に設けられている、請求項１又は２に記載の無停電電源装置。 The first or second aspect of claim 1 or 2, further comprising a charge / discharge control unit that controls the charge / discharge of the secondary battery to perform at least charge processing and discharge processing, and the power failure determination unit is provided in the charge / discharge control unit. Uninterruptible power supply. 前記充放電制御部はプロセッサを備え、前記停電判定部は、前記放電処理以外の処理中に前記電圧検知部から前記停電時に対応する信号を入力すると前記プロセッサの割り込み機能を用いて停電時であると判定し、前記放電処理を開始するよう構成されている請求項３に記載の無停電電源装置。 The charge / discharge control unit includes a processor, and when a signal corresponding to the power failure is input from the voltage detection unit during a process other than the discharge process, the power failure determination unit uses the interrupt function of the processor to perform a power failure. The uninterruptible power supply according to claim 3, which is configured to start the discharge process. 前記電流検知部は、前記外部電源、前記負荷装置及び前記二次電池に接続される共通の接地ラインに設けられている請求項２〜４のいずれか１項に記載の無停電電源装置。 The uninterruptible power supply according to any one of claims 2 to 4, wherein the current detection unit is provided on a common ground line connected to the external power supply, the load device, and the secondary battery. 前記スイッチ要素及び前記第二の整流要素を１つのMOSFETで構成した請求項１〜４のいずれか１項に記載の無停電電源装置。 The uninterruptible power supply according to any one of claims 1 to 4, wherein the switch element and the second rectifying element are composed of one MOSFET. 前記外部電源は、外部電力で駆動される直流電源である請求項１〜６に記載の無停電電源装置。 The uninterruptible power supply according to claim 1 to 6, wherein the external power supply is a DC power supply driven by external power.
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