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Application Notes
Sequential shunt regulation is widely used for regulating satellite bus voltages. A simplified sequential shunt configuration is shown in Figure 1.
The Keysight Technologies, Inc. E436xA modular solar array simulator (SAS) is ideal for this type of application. Operating in this configuration, the SAS output current either flows into the load or into the shunt control FETs. The shunt control FET will be referred to as “the shunt” or “the switch” for the remainder of Figure 1. Example of a simplified sequential shunt regulation configuration this paper. Figure 2 shows a typical solar array I-V curve. As an example, let’s assume operation at the maximum power point. When the shunt is open, the current to the load will be Imp (current at the maximum power point). When the shunt is closed, the current in the shunt is Isc (short circuit current). Figure 3 shows the output waveforms from one SAS. The output current of the SAS is basically constant because the difference between Imp and Isc is usually small; however, the voltage changes from near zero with a short (switch on) to Vmp (switch off).
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