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:
Dec. 26, 1989
Filed:
Oct. 04, 1988
Gary Russell, Pacific Grove, CA (US);
Walter J Kozacky, San Jose, CA (US);
Lockwood Technical, Inc., Sand City, CA (US);
Abstract
A solenoid driver system drives a solenoid, such as a solenoid in a glue applicator or any like apparatus incorporating a solenoid, and which requires control of the solenoid in response to a signal voltage. The solenoid driver system generates a turn on signal that enables the solenoid, such as that of a glue gun applicator, to energize quickly because of a rapid rise solenoid signal. A solenoid driver stage of two switching transistors and two high voltage fast recovery diodes are connected to a control pulse through a high side optical isolator and a high side buffer, and a low side optical isolator and a low side buffer. The low side circuit includes a trigger circuit and a delay circuit connected to a gate along with a free-running oscillator for periodically energizing the low side drive of the circuit in a mode as long as the input signal is energized. This ensures that the amount of current dissipated in the solenoid coil is small. A current sensing fault logic and shut down logic are provided to prevent damage to the solenoid driver system circuitry or the solenoid coil.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile