Patent ID: 8021122
Filing Date: 2011-09-20
Classification: H01Q,Y10T

Abstract:
1. An apparatus for controlling the fluid pressure in a spherical object having first and second fluid-filled chambers in which it is desired for the first chamber to have a greater internal pressure than the second chamber, said apparatus comprising: first pressure sensor configured to detect a difference in internal pressure between said first chamber and said second chamber and to output a differential value signal representing a difference in pressure between said first chamber and said second chamber; second pressure sensor configured to detect internal pressure within said second chamber and to output a detected pressure signal representing the internal pressure within said second chamber; a first threshold value generator for providing a first predetermined value signal indicating the desired difference in pressure between said first and second chambers; a first comparator responsive to said first pressure sensor and said first threshold value generator, said first comparator configured to generate a first comparator output when said differential value signal is less than said first predetermined value signal; a first blower responsive to said first comparator output for pressurizing said first chamber; a second threshold value generator for providing a second predetermined value signal indicating the desired pressure within said second chamber; a second comparator responsive to said detected pressure signal and said second predetermined value signal configured to generate a second comparator output when said detected pressure signal indicates a value less than a value indicated by said second predetermined value signal, wherein said second predetermined value signal is biased with input from said first comparator output; and a second blower responsive to said second comparator output for pressurizing said second chamber.