High voltage isolating switch power and a plurality of output isolated switch power systems

Abstract

The invention belongs to the field of power electronics and aims at providing a high voltage isolating switch power and a plurality of output isolated switch power systems. The switch power is inputted by AC power sources, inputted into a filter capacitor in parallel after being isolated and rectified by a transformer to change the impedance property, and then outputted by a conventional high frequency switch convertor; and the regulation direction of the switch power is opposite to the conventional direction. Output is divided into a voltage mode and a current mode; and an energy storage value of an output filter capacitor or inductance is higher than that of an input filter capacitor. The circuit and control method adopted by the voltage isolating switch power and the plurality of outputisolated switch power systems have the characteristics of compact structure, simple circuit, high working efficiency and low mutual interference among a plurality of auxiliary power sources, which are especially applicable to distributed auxiliary power supply needing high voltage and superhigh voltage insulated isolation, and can be applied in high voltage power electronic equipment. The high voltage isolating switch power and the plurality of output isolated switch power systems can also directly obtain electric energy from transmission lines of a power system, and assist to supply power for the power electronic equipment in an intelligent grid system.

Description

technical field [0001] The invention belongs to the field of power electronics, and relates to a high-voltage isolated switching power supply and a switching power supply system with multiple output isolations. Background technique [0002] High-voltage isolated power supply is used in the field of high-voltage power electronics. In the driving of power semiconductor devices in testing instruments, meters, and power electronic converters, it is necessary to use isolation voltages of tens of thousands of volts on the primary and secondary sides. Auxiliary power. Often multiple such isolated power supplies are required in one device or instrument. It is generally difficult for traditional isolated power supplies to meet such isolation requirements, and it is even more difficult to manufacture in the field of ultra-high voltage (eg 100kV). Due to the high-voltage isolation requirements, such a power supply produced by conventional solutions is often bulky, costly, and ineffic...

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Problems solved by technology

Unfortunately, the switching frequency of this circuit is high, which increases switching losses

In addition, due to the randomness of the bypass at the input end of the secondary side circuit, the situation of synchronous switching of multiple secondary side power supplies (that is, a voltage drop on the current source at the same time) still has a certain probability, and it still cannot completely solve the problem under the condition of relatively light load. The problem of the number of secondary side power supplies in series

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