Device for the stabilization of d.c. voltage

Claim 1

DEVICE FOR STABILIZING THE VOLTAGE SUPPLIED A DIRECT CURRENT VOLTAGE SOURCE TO A UTILIZATION MEANS INCLUDING A SWITCHING TRANSISTOR CONNECTED IN A SERIES BETWEEN SAID VOLTAGE SOURCE AND SAID UTILIZATION MEANS FOR SELECTIVELY CONNECTING SAID VOLTAGE SOURCE TO SAID UTILIZATION MEANS IN RESPONSE TO A CONTROL SIGNAL AND STORAGE CAPACITOR MEANS CONNECTED IN PARALLEL WITH SAID UTILIZATION MEANS SO AS TO BE CHARGED BY SAID VOLTAGE SOURCE, THE IMPROVEMENT COMPRISING MEANS FOR STABILIZING THE VOLTAGE ON SAID STORAGE CAPACITOR MEANS AT A PREDETERMINED VOLTAGE LEVEL INCLUDING VOLTAGE DIVIDER MEANS FOR DETECTING THE VOLTAGE DIFFERENCE BETWEEN A REFERENCE VOLTAGE AND A FRACTION OF SAID STABILIZED VOLTAGE, MULTIVIBRATOR MEANS FOR GENERATING SAID CONTROL SIGNAL VOLTAGE CONTROLLED VARIABLE IMPEDANCE MEANS CONTROLLED BY SAID VOLTAGE DIFFERENCE FOR BIASING SAID MULTIVIBRATOR MEANS TO A STABLE STATE PROVIDING A CONTINUOUS OUTPUT CONTROL SIGNAL WHEN SAID VOLTAGE SOURCE IS BELOW SAID PREDETERMINED VOLTAGE LEVEL AND FOR BIASING SAID MULTIVIBRATOR MEANS TO PROVID A SQUARE-WAVE OUTPUT CONTROL SIGNAL WHEN SAID VOLTAGE SOURCE IS ABOVE SAID PREDETERMINED VOLTAGE LEVEL, SAID MULTIVIBRATOR MEANS BEING PROVIDED WITH ENERGIZING VOLTAGE ON THE ONE HAND FROM SAID VOLTAGE SOURCE VIA IMPEDANCE MEANS AND ON THE OTHER HAND FROM SAID STORAGE CAPACITOR VIA RECTIFIER MEANS, AND AMPLIFIER MEAND CONNECTING THE OUTPUT OF SAID MULTIVIBRATOR MEANS TO SAID SWITCHING TRANSISTOR IN CONTROL THEREOF, THE IMPEDANCE OF SAID IMPEDANCE MEANS CONNECTED TO SAID MULTIVIBRATOR BEING MUCH GREATER THAN THE IMPEDANCE OF SAID RECTIFIER MEANS SUCH THAT SAID MULTIVIBRATOR MEANS IS ENERGIZED ESSENTIALLY ENTIRELY BY THE STABILIZED VOLTAGE OF SAID STORAGE CAPACITOR, THE RISE AND FALL TIMES OF SAID SQUARE WAVE BEING OF UNEQUAL DURATION, THE RATIO OF WHICH IS INVERSELY PROPORTIONAL TO THE MAGNITUDE OF SAID VOLTAGE DIFFERENCE DETECTED BY SAID VOLTAGE DIVIDER MEANS, SAID MULTIVIBRATOR MEANS INCLUDING AN ASYMMETRICAL MULTIVIBRATOR AND SAID VOLTAGE CONTROLLED VARIABLE IMPEDANCE MEANS FOR BIASING SAID MULTIVIBRATOR MEANS CONSISTING OF A TRANSISTOR CONNECTED IN THE BIASING CIRCUIT OF SAID MULTIVIBRATOR AND CAPABLE OF CONTROLLING THE BIAS THEREOF IN RELATION TO ITS INTERNAL IMPEDANCE, WHICH IS CONTROLLED BY THE MAGNITUDE OF SAID VOLTAGE DIFFERENCE.