REMOTE SENSING POTENTIAL DETECTION TYPE POWER SUPPLY FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a switchable remote sensing potential detection type power supply for vehicle, which causes no uncontrolled state when switching from a remote sensing control to a local control by suppressing complexity in circuit configuration, suppressing degradation in an output voltage precision, and suppressing addition of an adjustment element.;SOLUTION: The difference between a load terminal voltage (remote sensing potential) VR and a reference voltage Vref2 is detected with a remote sensing potential difference detection circuit 62, and is converted to a PWM control signal P2 by a PWM comparator 631. The difference between an output voltage (local potential) VL of a switching power source circuit 2 and a reference voltage Vref1 is detected with a local potential difference detection circuit 61, and is converted to a PWM control signal P1 by a PWM comparator 632. The switching power source circuit 2 is PWM-controlled by the logical product signal of the PWM control signals P1 and P2. Thus, even if a sensing line is disconnected or has poor connection, uncontrolled state is not caused, realizing DC output voltage control with high precision.;COPYRIGHT: (C)2005,JPO&NCIPI