编程脉冲具有恒定的脉冲宽度和增大的幅度，直到达到最大电压。

The programming pulses have a constant pulse width and increasing magnitudes until a maximum voltage is reached.

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块脉冲函数（BPF）用于PWM系统的分析及最优控制，获得分段恒定解；

Block Pulse Function (BPF) is applied in analysis and synthesis of optimal control for PWM systems, and a piecewise constant solution is obtained;

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