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:
Jan. 25, 1977
Filed:
Oct. 09, 1975
Rudolf Blum, Wendlingen, DT;
Robert Bosch G.m.b.H., Stuttgart, DT;
Abstract
To provide output power, for example for automotive test equipment from input sources having widely varying input voltages, for example between 4.5 and 32 V, without range switches, or setting potentiometers, a blocking oscillator circuit including a transformer and a switching transistor in series with the primary are connected across the input terminals, one secondary of the transformer charging a capacitor, another secondary of the transformer charging an auxiliary capacitor, the output voltage of which is connected to a control transistor to interrupt operation of the blocking oscillator formed by the transformer primary and the transistor when the voltage applied to the control transistor control electrode exceeds a reference value established, for example, by a Zener diode; a sensing resistor is connected in series with the main switching transistor, across which an output voltage is taken which is in turn applied to the control electrode of the control transistor to interrupt blocking oscillator operation of the main transistor when the current through the sensing resistor exceeds a predetermined value.