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| The commonly used methods of flow equalize for Switching power supply parallel system |
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How to improve the efficiency of power, is an important issue in power source The commonly used methods of flow equalize for Switching power supply parallel system are the following kinds. 1,The way of output impedance namely Droop (prolapse, tilt) method is to adjust outside characteristics gradient of converter switch(that is adjustment output impedance), to achieve all of the flow parallel module close to all flow. The method is a simple roughly the flow of method, precision are low. 2, the master-slave act applies to current model control switch power supply system in parallel. This all flow system have voltage control and current control,can form double closed loop control system. This method requires each module have communication, so maks the system complexity, and when the main failure, the whole power system will cannot work. 3, averageflow equalize,every parallel module current amplifier output terminal connect one of the same resistance to a public generatrix and form average bus. When a module voltage higher than bus voltage, the output voltage drop, and vice versa. Average flow and maximum flow are all of the method are flow off the bus or open will not affect all the power modules work independently,and they are automatically flow, precision is higher. If all flow bus bar is the average value of the parallel module current, it is average value all flow method; If is the maximum current parallel module, it is a maximum flow method; If all flow bus bar is the main module current in parallel module, the current is taken all flow method. But, in the flow equalize method, all flow each module need has a set of independent PWM control ring. |
