The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1981
Filed:
Jun. 22, 1978
Rhea W Bockhorst, Ponca City, OK (US);
Wiley E Zimmerman, Ponca City, OK (US);
Conoco, Inc., Ponca City, OK (US);
Abstract
An intrinsically safe regulated power supply has an input connected to a source of power and an output connected to a voltage-limited diode. The output current is limited by having a current sensor placed in series between the output terminal of the regulator and the diode. The current sensor generates an output which is applied to a differential amplifier. The differential amplifier develops an output voltage which is proportional to the current passing through the current-sensing means. This voltage is converted to a corresponding frequency which forms pulses having a repetition rate proportional to the frequency from the voltage-to-frequency converter but having a constant width. Pulses are applied to output transistors which control the current through the primary of a transformer. An excessive output current will convert the pulses to a low repetition rate, drastically cutting the voltage which will prevent excessive current through the load. Internal failures will electrically discontinue power transmission to the secondary of the transformer.