Modular parallel great power DC power source switch apparatus

Abstract

The invention relates to a module parallel type high power direct current switch power device which comprises a plurality of direct current switch power modules which are parallel and a plurality of outer ring negative feedback modules of total output current and voltage after being parallel. One of the direct current switch power modules is internally provided with a current negative feedback inner ring control loop, and one of the outer ring negative feedback modules is internally provided with a total output current negative feedback outer loop and a total output voltage outer ring loop. The invention eliminates the master-slave installation operation of the prior master-slave installation method parallel power device, thereby causing the use to become simple, saving components and lowering the cost. At the same time, the device is added with the total output current negative feedback outer ring loop to cause the total output current after being parallel to also get negative feedback control, thereby greatly enhancing the output stability of the device.

Description

technical field [0001] The invention relates to a high-power direct current switching power supply, in particular, it is a module parallel high-power direct current switching power supply device. Background technique [0002] DC switching power supply is a new type of power conversion device that has emerged in recent years. Its working method is AC-DC-AC-DC, that is, it first rectifies and filters the 50Hz low-frequency AC of the power grid into DC, then inverts the DC into high-frequency AC, and then rectifies and filters the high-frequency AC into DC output. Among them, the transformation efficiency of high-frequency AC in the transformer is much higher than that of 50Hz low-frequency grid AC. Therefore, the transformer can be made very small. Therefore, compared with the traditional phase-controlled power supply, it has the advantages of small size and light weight, so it has been developed in recent years. However, because it is limited by the rated power of power dev...

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Problems solved by technology

The disadvantages of this parallel connection method are: First, the master and slave settings need to be set before each use, which increases the number of operations

The second is that if the main module fails, the entire power supply device cannot work, and it is difficult to improve the reliability of the work.

The third is that the output stability is not high enough. This is because the device only performs negative feedback control of the shunt output current, but does not perform negative feedback control of the total output current. That is to say, only one is set at the output of each module. Current feedback detection point, and use the current negative feedback inner loop of each module to carry out negative feedback control of the shunt current in the module, but there is no feedback current detection point at the total output end after multiple modules are connected in parallel, and there is no total output The current negative feedback control loop, therefore, the negative feedback control of the total output current cannot be performed

Because in the parallel device, the current has a process of shunting and then merging, if only the negative feedback control of shunting is performed, and the negative feedback control after merging is not performed, it is difficult to achieve a good level of output stability.

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