電圧検出回路、過電流検出回路、充電電流制御システム、及び電圧検出方法

Voltage detecting circuit, overcurrent detecting circuit, charge current control system, and voltage detecting method

Abstract

PROBLEM TO BE SOLVED: To solve the problem that detection values output from a voltage detecting circuit are varied by variations in relative error components of a plurality of resistors for dividing an input voltage, variations in input offset components of a voltage amplifier for amplifying an input minute voltage and variations in input offset components of a comparator for comparing an amplified voltage value whether it is not less than a certain level, in the case the detected voltage value is too minute in the voltage detecting circuit. SOLUTION: The input voltage is detected two times at a first period and a second period by using a switch circuit and a sampling circuit, and detected values are averaged. In this case, the variations in the relative error components of the plurality of resistors for dividing the input voltage, the variations in the input offset components of the voltage amplifier for amplifying the input minute voltage, and the variations in the input offset components of the comparator for comparing the amplified voltage value whether it is not less than the certain level, are subjected to an addition process respectively such that their positive/negative polarizations at the first and second periods are opposite to each other. Therefore, only effective components of the object voltage to be detected can be detected precisely. COPYRIGHT: (C)2006,JPO&NCIPI
【課題】電圧検出回路において検出電圧値があまりにも微小である場合、入力電圧を分圧するための複数の抵抗の相対誤差成分のバラツキ、入力された微小な電圧を増幅する電圧増幅器の入力オフセット成分のバラツキ、増幅された電圧値が一定レベル以上かどうかを比較する比較器の入力オフセット成分のバラツキにより、電圧検出回路の出力する検出値がばらつく。 【解決手段】スイッチ回路およびサンプリング回路を用い、第一期間・第二期間にて入力電圧を2回検出し平均化する。この際、入力電圧を分圧するための複数の抵抗の相対誤差成分のバラツキ、入力された微小な電圧を増幅する電圧増幅器の入力オフセット成分のバラツキ、増幅された電圧値が一定レベル以上かどうかを比較する比較器の入力オフセット成分のバラツキ、それぞれが第一期間と第二期間にて正/負が反対の極性になるように加算し、検出対象電圧の実効成分のみが精度良く検出できるようにする。 【選択図】図1

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