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aphelion APPENDIX approximately array power obtained array temperature sensor array to operate array voltage operating astronomical unit battery and load Battery charge battery voltage capacitor charging current circuitry conditioning network constant control signal curve dc supply designed determine the values diode directly coupled duty cycle factor figure 11 Figure 17 figure 9 function of array Illumination intensity illumination levels Impedance Matching Langley Research Center maximum array power maximum available array maximum power point modulator nickel-cadmium battery OBTAIN MAXIMUM ARRAY obtaining maximum power ohms open-circuit voltage Optimum orbiting spacecraft output voltage perature percent perihelion pulse pulse-width pulse-width-modulated regulator radiation resistive temperature sensor resistors sensor load resistance sensor voltage signal conditioning signal-conditioning network simulated array temperature solar array solar-cell temperature sensor subscripts denoting different switching period switching power transistor technique Test setup thermal thermal mass transient errors typical voltage at maximum voltage operating error volts dc watt-hours watts