Electronic load requires high input current slew rate for the dynamic test. An inductor current step (ICS) control (nonlinear control) cooperating with input voltage feedforward (linear control) during the transient is proposed to realize fast input current step response. The ICS control pushes the inductor current and the duty cycle to the target quiescent point within minimum time. Starting from the target quiescent point, the linear control with input voltage feedforward takes over. The advantage of proposed control is that the ICS control is able to break the low bandwidth in discontinuous conduction mode current loop, improving the input current slew rate. The input voltage feedforward can compensate the input capacitance current diversion, further improving the input current transient response. Compared with the conventional linear control, the maximum slew is increased from 32.9 to 699 A/ms, the settling time is decreased from 1.42 ms to 236 μs, increased by 21.2 times and decreased by six times respectively, when the input current steps from 1 to 24 A at 200-V input voltage in a 5-kW prototype.

中文翻译：

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具有输入电压前馈的电感电流阶跃控制可实现能量回收直流电子负载的快速负载瞬态


电子负载需要高输入电流转换速率才能进行动态测试。提出了一种在瞬态期间与输入电压前馈（线性控制）配合的电感电流阶跃（ICS）控制（非线性控制），以实现快速输入电流阶跃响应。 ICS 控制在最短时间内将电感器电流和占空比推至目标静态点。从目标静态点开始，具有输入电压前馈的线性控制开始起作用。所提出的控制的优点是ICS控制能够打破不连续导通模式电流环路中的低带宽，提高输入电流转换速率。输入电压前馈可以补偿输入电容电流分流，进一步改善输入电流瞬态响应。与传统线性控制相比，当输入电流从1阶跃变化时，最大压摆率从32.9 A/ms增加到699 A/ms，稳定时间从1.42 ms减少到236 μs，分别增加了21.2倍和减少了6倍。在 5kW 原型中，输入电压为 200V 时电流可达 24A。