To provide an input protection circuit which can protect an excessive voltage due to resonance of an LC filter generated caused by supply voltage fluctuates from being applied to an electronic apparatus.SOLUTION: An input protection circuit 100 comprises an LC filter 110 for removing noise superimposed on a supply voltage applied to an electronic apparatus 300 by a battery 200, a reverse connection protection circuit 120 having a MOS FET 122 for reverse connection protection which is connected between the battery 200 and the electronic apparatus 300 and turned off during reverse connection of the battery 200, and a reverse current protection circuit 130 for turning off the MOS FET 122 when a voltage applied by the battery 200 is lower than an output voltage of the LC filter 110.SELECTED DRAWING: Figure 1

    【課題】電源電圧の変動に伴って発生するLCフィルタの共振による過大な電圧が電子機器に印加されることを防止することができる入力保護回路を提供すること。【解決手段】入力保護回路100は、バッテリ200から電子機器300に印加される電源電圧に重畳されるノイズを除去するLCフィルタ110と、バッテリ200と電子機器300との間に接続されてバッテリ200の逆接続時にオフされる逆接保護用のMOS FET122を有する逆接保護回路120と、バッテリ200から印加される電圧がLCフィルタ110の出力電圧よりも低下したときにMOS FET122をオフする逆電流保護回路130とを備えている。【選択図】図1


    Access

    Download


    Export, share and cite



    Title :

    INPUT PROTECTION CIRCUIT


    Additional title:

    入力保護回路


    Contributors:
    MIURA SHO (author)

    Publication date :

    2020-08-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H01L Halbleiterbauelemente , SEMICONDUCTOR DEVICES / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



    CURRENT INPUT CIRCUIT

    European Patent Office | 2017

    Free access

    Environment specific input protection

    HENDERSON GEORGE R | European Patent Office | 2022

    Free access

    ENVIRONMENT SPECIFIC INPUT PROTECTION

    HENDERSON GEORGE R | European Patent Office | 2019

    Free access

    Discretionary current input circuit

    DHAWAN MOHIT / SHENOY NAMRITHA H / EISENBEIS KIRK N et al. | European Patent Office | 2024

    Free access

    Microcomputer input/output circuit

    TAKAHASHI HIROAKI | European Patent Office | 2022

    Free access