Electric lamp and discharge devices: systems – With automatic shunt and/or cutout – Supply circuit current and/or potential actuated switch
Patent
1987-04-24
1988-10-18
Moore, David K.
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
Supply circuit current and/or potential actuated switch
315241S, 315307, 315241P, 361 91, 361 90, 363 50, 363 78, 363124, H02M 3315, H02M 3335, H02H 320, H01J 4116
Patent
active
047790270
ABSTRACT:
An overvoltage protection circuit limits the output voltage of a DC to DC converter to a maximum desired output voltage. An output voltage sensing circuit includes a semiconductor device such as a sidac having a normal resistive region of operation as well as a negative resistance region of operation which begins at a breakover voltage and extends into a foldback region. One terminal of the sidac is coupled to sense the converter output voltage while the second terminal opposite end of the sidac is coupled to a biasing device in the form of a resistor which generates an overvoltage signal when the sidac conducts current. The overvoltage signal from the biasing resistor is coupled to a converter switching transistor disabling circuit which reduces the converter output voltage to a level below the maximum desired output voltage in response to the overvoltage signal.
REFERENCES:
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patent: 4092710 (1978-05-01), Wadsworth
patent: 4449173 (1984-05-01), Nishino et al.
patent: 4571656 (1986-02-01), Ruckman
patent: 4572988 (1986-02-01), Handler et al.
patent: 4638395 (1987-01-01), Nilssen
patent: 4644228 (1987-02-01), Nilssen
patent: 4661878 (1987-04-01), Brown et al.
patent: 4682081 (1987-07-01), Sikora
Moore David K.
Powell Mark R.
Tomar Electronics, Inc.
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