초록 ▼

To protect the battery in an automotive electrical system against over-charging upon failure of the voltage regulator to control current flow through the field of an automotive alternator, the field current is conducted through an interruptable network element, for example a fuse or a relay controll

To protect the battery in an automotive electrical system against over-charging upon failure of the voltage regulator to control current flow through the field of an automotive alternator, the field current is conducted through an interruptable network element, for example a fuse or a relay controlled switch. A voltage sensing network, for example a Zener diode, is connected to control current flow through a controlling element, for example a thyristor, which provides either an auxiliary current to burn out the fuse or a control current to the relay coil to interrupt connection to the field if over-voltage has been sensed. Simultaneously, an indicator lamp can be energized to indicate malfunction of the voltage regulator.

대표청구항 ▼

Overload protected, self-contained mobile electrical network system having two d-c terminals; an electrical generator (G) having its output connected to the d-c terminals and further having a field winding; a storage battery (11) connected to the d-c terminals of the network and to the output of the

Overload protected, self-contained mobile electrical network system having two d-c terminals; an electrical generator (G) having its output connected to the d-c terminals and further having a field winding; a storage battery (11) connected to the d-c terminals of the network and to the output of the generator to store electrical energy therein; a voltage regulator (6) connected to sense the output voltage of the generator and intermittently controlling current flow through the field winding (5) thereof; and an over-voltage control circuit to prevent damage to the battery connected to the generator and to continuously and positively interrupt current flow to the field winding of the generator upon short circuit within the voltage regulator including a fuse (12) connected in series with the field winding (5) of the generator and to one(-) terminal of the network; and means providing a control current to said fuse independently of said voltage regulator under over-voltage conditions of said network, comprising a thyristor (15) having one terminal of its main current carrying path connected to the other d-c terminal (+) of the network; a branch circuit (16) from the other terminal of the main current carrying path of the thyristor to the fuse (12) at a point remote from said one d-c terminal (-); a Zener diode providing a reference voltage, connected to and controlling application of a trigger voltage to the gate terminal of the thyristor to cause the thyristor to become conductive when the output voltage from the generator has a prohibited excess relationship with respect to said reference voltage, whereby conduction of said thyristor will apply short circuit current directly from said other d-c terminal (+) of the network through the branch circuit (16) to the fuse and to the one d-c terminal (-) of the network to cause the fuse to burn out under loading by said short circuit current and thereby interrupt current flow to the field winding (5) regardless of the conduction condition of the voltage regulator.