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A brief analysis of the forced current sharing method for a modular power supply parallel method

Date:2016年4月5日 17:11

Want to parallel and realize the flow of multiple modules, engineers can choose the relatively simple average current method, you can also choose a relatively good accuracy of the external flow controller. In addition, there is a way to work in the process is more commonly used, that is forced to flow method. In this paper, we will introduce a simple introduction to the forced current sharing method, and help the engineers to understand the working principle of the parallel current sharing method.

Currently used forced flow, mainly through the circuit system monitoring module of a plurality of parallel power supply module implementation flow, flow in the parallel implementation are mainly two kinds of control software and hardware control. Below we will be described separately.

First of all, we look at the forced flow method of the software control mode. The so-called software control, just as its name implies, is to compare the current of each module and the average current of the system by software calculation, and then adjust the module voltage to make the current and average current is equal. This kind of software control method is easy to implement and has high accuracy, but its transient response is relatively poor, and the adjustment time is long.

After understanding the software control method, we will look at the hardware control method of forced current sharing method. The technical principle of hardware control mode is shown in the following figure. Through the following figure we can see more clearly, the sampling voltage us. And the system reference voltage ut compared to produce error voltage UE, the voltage sent to each module, and module is a current comparing and adjusting the reference voltage module, thus changing the output voltage, can adjust the output current, order to achieve current sharing. Such that each module is equivalent to a voltage controlled current source. This kind of hardware control system has high precision, good dynamic response, and can be controlled by many modules, which can be easily composed of redundant system.

The graph is the principle diagram of the hardware control mode of the forced current sharing method

 

  Power engineers in the use of forced current sharing of parallel multi module power, need to pay attention to is, in forced flow in the process of operation, due to the monitoring system to monitor the number of modules can be a lot of, the parameters set without any adjustment, current sharing precision even higher than 2%, the load response fast (within a few hundred MS) and non oscillation phenomenon. But this kind of forced flow is mainly dependent on the quality and precision of the monitoring module. If the monitoring module fails in the work process, it can not ensure the realization of the average flow.
 

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