Grading frequency conversion type multipath series resonance inverter power supply

Abstract

The invention discloses a grading frequency conversion type multipath series resonance inverter power supply. The grading frequency conversion type multipath series resonance inverter power supply comprises a rectification transformer, a three-phase full bridge phase control rectifier, an LC filter, an H-bridge inverter, a matching transformer, a load coil and n parallelly-conected grading frequency conversion units, wherein each grading frequency conversion unit comprises a charge bleeder, a resonant capacitor and a switching switch, the charge bleeder is in parallel connection with the resonant capacitor, one end of the charge bleeder is connected with the matching transformer, and the other end is connected with the load coil. The inverter power supply is advantaged in that through switching different grading frequency conversion units and matching the corresponding H-bridge inverter driving frequency, grading frequency conversion operation of the power supply is realized; residual charges in the resonant capacitor can be released in the quite short time, DC bias borne by the switching switch is timely eliminated, and over-voltage burning of the switching switch can be prevented; the switching switch is controlled through employing a synchronization triggering strategy and a synchronization switching strategy, the control strategies are simple, seamless switching of output current frequency of the power supply is guaranteed, and current harmonic distortion is small.

Description

technical field [0001] The invention belongs to the field of power electronics, and more specifically relates to a hierarchical frequency conversion multi-channel series resonant inverter power supply. Background technique [0002] Series resonant inverter power supply is widely used in the design of various high-frequency and high-power power supplies such as induction heating power supply, ultrasonic power supply, laser power supply and tokamak power supply. Series resonant inverter power usually adopts AC-DC-AC topology, that is, AC-DC rectification and DC-AC inverter. like figure 1 As shown, the main circuit topology of the series resonant inverter power supply provided by the prior art includes a rectifier transformer 1, a three-phase full-bridge phase-controlled rectifier 2, an LC filter 3, an H-bridge inverter 4, a matching transformer 5, a resonant capacitor 6, load coil 7. The input terminal of the rectifier transformer 1 takes power from the 10kV power grid, and...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a multi-channel series resonant inverter power supply with graded frequency conversion, which aims to solve the problem that the existing series resonant inverter power supply cannot be operated with graded frequency conversion, so as to meet the requirements of related applications (such as Carmack Physics Experiment) Requirements

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