in detail with regards to fig2 and 3 as depicted in fig5 a the power supplied to the load 110 remains sufficient at all times supplied by the first power supplies 130 a and 130 b and second power supplies 150 b and 150 c as the first power supplies 130 a 130 b are u201c running down u201d and the second power supplies 150 b 150 c are u201c ramping up u201d after the first power supplies 130 a and 130 b complete their run down the power supplied to the load 110 can be completely supplied by the second power supplies 150 a 150 b and 150 c certain embodiments and features have been described above using one or more sets of numerical limits it should be appreciated that ranges from any lower limit to any upper limit are contemplated unless otherwise indicated certain lower limits upper limits and ranges appear in one or more claims below all numerical values are u201c about u201d or u201c approximately u201d the indicated value and take into account experimental error and variations that would be expected by a person having ordinary skill in the art various terms have been defined above to the extent a term.