CONTROL UNIT AND EMERGENCY LIGHTING DEVICE
To provide a control unit that suppresses the variation of the charge current to charge a battery and controls the constant current without adding components with large variation such as Zener diodes or costly components such as shunt regulators, and a display device.SOLUTION: The control unit compr...
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Zusammenfassung: | To provide a control unit that suppresses the variation of the charge current to charge a battery and controls the constant current without adding components with large variation such as Zener diodes or costly components such as shunt regulators, and a display device.SOLUTION: The control unit comprises: a charging circuit 150 with transistors 151 and resistors 152 connected in series to a battery to be charged; a first detection unit 157 that detects the voltage on one end side of a current detection element 152; a second detection unit 158 that detects the voltage on the other end side of the current detector 152; and a control unit 181 that sets a target value based on a second detection value detected by the second detection unit 158 and a charge current value of the battery 300, and controls the current flowing to the transistor 151 so that a first detection value detected by the first detection unit 157 becomes equal to the target value.SELECTED DRAWING: Figure 5
【課題】ツェナーダイオード等のばらつきの大きい部品やシャントレギュレータ等のコストの高い部品を追加することなく、電池を充電する充電電流のばらつきを抑制し定電流制御するコントロールユニット並びに表示装置を提供する。【解決手段】コントロールユニットは、充電する電池に対して直列に接続されたトランジスタ151ならびに抵抗152を備えた充電回路150と、電流検出素子152の一端側の電圧を検出する第1の検出部157と、電流検出素子152の他端側の電圧を検出する第2の検出部158と、第2の検出部158が検出する第2の検出値と電池300の充電電流値とに基づき目標値を設定し、第1の検出部157が検出する第1の検出値が目標値と等しくなるように、トランジスタ151に流れる電流を制御する制御部181と、を備える。【選択図】図5 |
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