Capacitor charging method and apparatus with constant power input characteristic

Abstract

The invention belongs to the technical field of power supplies, and in particular relates to a capacitor charging method and apparatus with constant power input and constant current output characteristics. A continuous working mode characteristic is mainly adopted, and returned redundant energy is stored in a temporary energy storage link, so as to charge a load and charge the energy storage link at the same time; in addition, a mode of switching an excitation source in the front half cycle of resonance current is adopted to establish an access for outputting energy to a resonance loop in the energy storage link so as to realize that the temporary energy storage link can perform an auxiliary power supplying function together with a power grid in the charging period for the load; and through real-time regulation and control on the switching time, the constant of the power supply power is realized. The temporary energy storage link is a voltage source, and a DC-link direct current busbar is a voltage source also; for avoiding short circuit between the two voltage sources of different voltages, the two voltage sources are serially connected with bidirectional switches respectively and then the voltage sources are connected with the resonant loop so as to realize the reliable switch of the resonant current between the voltage sources.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to a capacitor charging method and device with constant power input and constant current output characteristics. Background technique [0002] Pulse power system is used in high power laser and high power microwave and other fields. The capacitor charging power supply is an important part of the pulse power system. With the development of the pulse power system in the direction of high power, high repetition frequency, long running time and high power density, the same requirements are put forward for the charging power system. In recent years, with the increase of the power capacity and repetition frequency of the charging system, the adverse impact of the charging power system on the power grid has gradually emerged. For the power grid, the charging power supply is a nonlinear and transient load, which will not only generate a large number of harmonics, but also cause fluc...

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Problems solved by technology

However, the output power of the constant current output power supply gradually increases with the increase of the load capacitor voltage, and the power supply at the input terminal gradually changes, which will cause large current harmonics and reduce the power supply efficiency of the power grid; secondly, the power grid is required to be able to provide power The required peak power will increase the cost of power distribution; finally, after the charging is completed, the power supply will drop from the peak power to 0 instantaneously, which will cause severe fluctuations in the grid voltage, and even cause fluctuations in the grid frequency, especially when the pulse repetition frequency is close to Under the condition of grid frequency operation, it may cause grid oscillation, which will adversely affect the stability and reliability of the grid

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