Power supply with overvoltage protection circuit

Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means

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Details

307 102, 323231, 323313, 361 91, G05F 1569

Patent

active

052913651

ABSTRACT:
First, second, and third power supply lines are separate from each other. A power supply circuit receives electric power from the first power supply line, and generates a given power supply voltage from the received electric power and outputs the generated power supply voltage to the third power supply line. An electronic circuit is connected to the third power supply line to be activated by the power supply voltage. The electronic circuit has an input section for receiving an input signal from the second power supply line. A protective circuit provided in the electronic circuit leaks a current from the input section of the electronic circuit toward the third power supply line when a voltage of the input signal exceeds the power supply voltage. A reference voltage generating device serves to generate a first reference voltage in the presence of the electric power fed from the first power supply line to the power supply circuit, and serves to generate a second reference voltage in the absence of the electric power fed from the first power supply line to the power supply circuit. The second reference voltage is lower than the first reference voltage. A voltage limiting device being responsive to the first and second reference voltages serves to limit a voltage of the third power supply line to below a level approximately equal to the first or second reference voltage.

REFERENCES:
patent: 4476426 (1984-10-01), Kishimoto et al.
patent: 4736271 (1988-04-01), Mack et al.
Practical Circuit for Electrical Power Source (English translation attached), (undated).
Improvement in Electrostatic Breakage Resistivity (English translation attached), (undated).

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