Fail-safe reference voltage source

Details Fail-safe reference voltage source Fail-safe reference voltage source

1973-11-19

1976-04-13

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

317 16, 317231, 323 22Z, H02M 114

Patent

active

039506908

ABSTRACT:
This disclosure relates to a vital type of d.c. reference voltage supply. The reference voltage supply is coupled to a suitable source of a.c. voltage. A zener diode rectifies the a.c. voltages and regulates the rectified d.c. voltage. A current-limiting resistor is connected from the zener diode to a four-terminal capacitor which charges to a value approximately equal to the zener breakdown voltage minus the diode voltage drop. Hence, a constant d.c. reference voltage is produced when and only when no critical component or circuit failure is present.

REFERENCES:
patent: 1924606 (1933-08-01), Hammond
patent: 2841771 (1958-07-01), Dunleavey
patent: 3063001 (1962-11-01), White
patent: 3259834 (1966-07-01), Wright
patent: 3439230 (1969-04-01), Lambert et al.
patent: 3614539 (1971-10-01), Hallenbeck
patent: 3747014 (1973-07-01), Darrow
patent: 3842334 (1974-10-01), Franz
Motorola Semiconductor Handbook, June 1, 1965, pp. 2-13, 2-14.

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