Agilent HP AN 1293 Application Note free download

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Agilent AN 1293 Sequential Shunt Regulation Application Note SAS Satellite + GPIB SAS #1 Control - Battery Control Load Bus CKT Cap + Control SAS #2 Control Signals - I Isc Imp Pmp + Control RL SAS #N - Figure 1 Vmp Voc V Regulating Satellite Bus Voltage assume operation at the maximum Figure 2 The sequential shunt regulator is power point. When the shunt is open, Isc= short circuit current widely used for regulating the satellite the current to the load will be Imp Imp= current at the maximum power bus voltage. A simplified sequential (current at the maximum power Vmp= voltage at the maximum power shunt concept is shown in Figure 1. point). When the shunt is closed, the Voc= open circuit voltage current in the shunt is Isc (short cir- Pmp= maximum power point The Agilent Technologies E4350B/ cuit current). Figure 3 shows the out- RL= load line E4351B Solar Array Simulators (SAS) put waveforms across one SAS. The are ideal for this type of application. output current of the SAS is basically Operating in this mode, the current constant because the difference either flows into the load or into the between Imp and Isc is usually small shunt control FETs. The shunt control but the voltage changes from a short FET will be referred to as the shunt (switch on) to Vmp (switch off). or the switch for the remainder of the paper. Figure 2 shows a typical solar array I-V curve. As an example, let's Sensitivity Po