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:
May. 30, 1989
Filed:
May. 17, 1988
Raffaele Ricci, Pregnana Milanese, IT;
Gabriele Rotondi, Cerro Maggiore, IT;
Bull HN Information Systems Italia S.p.A., Milan, IT;
Abstract
Power recovery circuit for printer haivng printing elements actuated by electromagnets energized by a voltage VS available at a terminal. The circuit includes a voltage booster for generating a voltage HV higher than voltage VS at a node and a buffer capacitor charged by the voltage HV and connected between the terminal and the node, a connection between the electromagnets and the node for transferring the magnetic energy imparted to the electromagnets by the buffer capacitor for storing therein as capacitive energy, an inductor and a control switch, series connected between the node and the terminal, a recirculation diode connected between ground and the node common to the switch and the inductor, a voltage detector providing an enabling signal when voltage HV exceeds a predetermined level and a controlled oscillator, enabled by the enabling signal to generate a control signal which periodically switches the control switch on and off.