Fig. 5

Various HVPSU parameters plotted against output current. Top: shows how the output voltage drops linearly with current draw, consistent with an output impedance of 1.47 k\(\Omega \). The linear fit has an \(R^2 > 0.998\). The switching converters produce voltage ripple on the output that increases with current drawn. Bottom: shows the efficacy of the circuit with respect to output current. For low currents the quiescent current of the circuit dominates the output power. At higher currents the loss over the effective output impedance dominates. Current drawn from the battery is also shown to rise at approximately eight times the high voltage output current in accordance with theory. The typical operating current range of the subsequent HVCP is shown as the shaded region