Drooping method working principle circuit diagram

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The drooping method is called the external characteristic drooping method, also called the slope control method. In a parallel power module system, each power module operates independently. Each module determines the output current based on its external characteristics and voltage parameter values. In the drooping method, the current feedback signal is mainly used to adjust the output impedance of each module, that is, the slope of Vo=f(Io) is adjusted to adjust the output current. The working principle diagram is shown in the figure.

Drooping method working principle circuit diagram

Ri is the sampling resistor of the output current Io of any parallel module. The current feedback voltage signal Vi is generated by current amplification. Vf is the output voltage feedback, Vr is the sum of Vi and Vf, Vg is the control reference voltage (5V), and Ve is the error voltage. . When the output current Io of a certain module is too large, the voltage and current feedback synthesis signal Vr=Vi+Vf increases. After comparing with Vg, Ve is decreased, and Ve is fed back to the control part of the power module to make the output voltage of the module Io. When it falls, Io decreases, that is, the characteristic of Vo=f(Io) is lowered. Each module individually adjusts its own output current to achieve parallel current sharing of each module.
The advantage of this method is that it does not require an additional current sharing device and is an open loop control. The disadvantage is that the adjustment accuracy is not high, and each module must be individually adjusted. If the power of the modules in parallel is different, the current imbalance between the modules is prone to occur.