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A voltage regulator of a vehicle AC generator includes a switching element connected between a battery and a field coil, a control circuit for controlling the switching element according to battery voltage, a power circuit for supplying the control circuit with a constant voltage and a reverse-curre

A voltage regulator of a vehicle AC generator includes a switching element connected between a battery and a field coil, a control circuit for controlling the switching element according to battery voltage, a power circuit for supplying the control circuit with a constant voltage and a reverse-current blocking diode having an anode connected through an outside power line to the battery and a cathode connected to the power circuit. Even if a large negative surge voltage is generated in a power line connected to a battery, and applied to the power circuit, the output voltage, i.e. VDD, does not widely fluctuate, so that devices included in the voltage regulator, such as a comparator or an oscillator, can operate properly.

대표청구항 ▼

1. A voltage regulator of a vehicle AC generator having a field coil for charging a battery, said voltage regulator comprising:a switching element connected between said battery and said field coil; a control circuit for controlling said switching element according to terminal voltage of said batter

1. A voltage regulator of a vehicle AC generator having a field coil for charging a battery, said voltage regulator comprising:a switching element connected between said battery and said field coil; a control circuit for controlling said switching element according to terminal voltage of said battery; a power circuit having a high-side input terminal, said power circuit providing a constant voltage from power supplied to said high-side terminal and supplying said control circuit with said constant voltage; and a reverse-current blocking diode having an anode connected through an outside power line to said battery and a cathode connected to said high-side terminal.