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首页> 外文期刊>IEEE Power Electronics Letters >Adjustable shunt regulator based control systems
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Adjustable shunt regulator based control systems

机译：基于可调节并联稳压器的控制系统

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摘要

Adjustable shunt regulators known as TL431 are extensively used to build the control systems in switched-mode converter applications. The resulting control system is typically a two-loop system, where one loop defines the low frequency behavior, and the other loop the higher frequency behavior, respectively. The shunt regulator is regarded to possess characteristics similar to an operational amplifier, even if it is basically a transconductance amplifier having current as an output signal instead of voltage as well as positive feedback instead of negative feedback. The small-signal response of a shunt regulator shows that it may be modeled as a voltage-controlled current source with a small transconductance gain and an equivalent capacitor as output impedance, which may be extracted from the open-loop frequency response by inspection. The variance in the parameters may be high depending on the manufacture, and operating point, i.e., cathode current, which is normally chosen to be close to 1 mA due to the specifications. The analysis shows, however, that the cathode current should be at least 5 mA for stable equivalent circuit parameters. If low cathode current is used, the control system may not be better than a Zener diode replacing the shunt regulator.
机译：可调并联稳压器TL431被广泛用于构建开关模式转换器应用中的控制系统。最终的控制系统通常是两回路系统，其中一个回路定义了低频行为，另一个回路定义了高频行为。即使并联稳压器基本上是具有电流而不是电压作为输出信号以及正反馈而不是负反馈的跨导放大器，也被认为具有类似于运算放大器的特性。并联稳压器的小信号响应表明，它可以建模为具有较小跨导增益和等效电容器作为输出阻抗的压控电流源，可以通过检查从开环频率响应中提取出来。取决于制造商和工作点，即阴极电流，参数的变化可能很大，由于规格，通常将其选择为接近1mA。但是分析表明，对于稳定的等效电路参数，阴极电流应至少为5 mA。如果使用低阴极电流，则控制系统可能不会比替代并联稳压器的齐纳二极管更好。

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