Total charge measurement

Details Total charge measurement Total charge measurement

2008-07-01

2008-07-01

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

C320S166000

Reexamination Certificate

active

07394230

ABSTRACT:
In a fast power converter with distributed output capacitors with parasitic impedances between them, the settling time of the output voltage is too long, making voltage unsuitable as a control input. The charge on each of the distributed output capacitors can be measured, preferably differentially, in a summing network in which the conductance of each of the summing resistors is proportional to the capacitance of the capacitor with which it is associated. The charges can be summed as a total charge control input for the fast power converter. The total charge control is very sensitive to changes in the output current, and is insensitive to lags, ringing and/or oscillations of the voltages among the distributed capacitors. If the output capacitor of a VRM is small compared to the total capacitance, the impedance of its connector is largely mitigated.

REFERENCES:
patent: 6121761 (2000-09-01), Herbert
patent: 7002328 (2006-02-01), Kernahan et al.
patent: 7139180 (2006-11-01), Herbert

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