POWER SUPPLY VOLTAGE MONITORING CIRCUIT AND CONTROL DEVICE

• Main Author: ITO TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2020
• Subjects: CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING; TESTING

To provide a power supply voltage monitoring circuit capable of detecting occurrence of a failure when the failure has occurred in a component of the power supply voltage monitoring circuit.SOLUTION: A power supply voltage monitoring circuit 2 comprises: a power supply intermittent circuit unit 20 arranged between an input power supply line 113 and an output power supply line 114; a series circuit 3 constituting of first to third series resistors 31 to 33; a first opening and closing element 411 connected in parallel to the first series resistor 31; a second opening and closing element 421 connected in parallel to the second series resistor 32l; a first determination circuit 51 determining whether a first divided voltage V1 between the first series resistor 31 and the third series resistor 33 is within a normal range; a second determination circuit 52 determining whether a second divided voltage V2 between the second series resistor 32 and the third series resistor 33 is within the normal range; and a driving circuit 54 setting the power supply intermittent circuit unit 20 as a connection state when the first and second divided voltage V1 and V2 are both in the normal range, and as a cut-off state when either is not in the normal range.SELECTED DRAWING: Figure 2 【課題】電源電圧監視回路の構成部品に故障が発生した場合に、当該故障の発生を検出することができる電源電圧監視回路を提供する。【解決手段】電源電圧監視回路２は、入力電源線１１３と出力電源線１１４との間に配置された電源断続回路部２０と、第１乃至第３の直列抵抗器３１〜３３からなる直列回路３と、第１の直列抵抗器３１に並列接続された第１の開閉素子４１１と、第２の直列抵抗器３２に並列接続された第２の開閉素子４２１と、第１の直列抵抗器３１と第３の直列抵抗器３３との間の第１の分圧電圧Ｖ１が正常範囲か否かを判定する第１の判定回路５１と、第２の直列抵抗器３２と第３の直列抵抗器３３との間の第２の分圧電圧Ｖ２が正常範囲か否かを判定する第２の判定回路５２と、第１及び第２の分圧電圧Ｖ１，Ｖ２が共に正常範囲である場合に電源断続回路部２０を接続状態とし、何れかが正常範囲でない場合に遮断状態とする駆動回路５４とを備える。【選択図】図２