Voltage doubler with delayed loading

A power supply comprising, in combination:

• a source of unidirectional voltage, comprising a reserve battery, having first and second terminals of opposite polarity;
• a series circuit connected across said source including in sequence a first capacitor and first and second unidirectional conductors oriented for conduction in the same direction to charge said first capacitor from said source;
• means for connecting a load, to be energized from said source, across said first capacitor;
• a second capacitor having a first terminal, connected to said series circuit between said unidirectional conductors, and a second terminal;
• switching means energizable to alternately connect said second terminal of said second capacitor to said terminals of said source;
• and means, including one of said unidirectional conductors, initially preventing flow of current from said source, and effective after a first positive alternation of said switching means to enable flow of current from said source.