Coupled inductor-type three-level Zeta converter

A technology of coupled inductors and converters, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve problems such as voltage conversion ratio switching duty cycle dependence
CN104967313AInactive Publication Date: 2015-10-07HARBIN INST OF TECH
5 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2015-10-07
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a coupled inductor-type three-level Zeta converter, which relates to the technical field of power electronics converters and aims at solving the problem that as voltage gain is limited by the value of a duty ratio, a voltage conversion ratio of the circuit depends too much on selection of the switch duty cycle. Primary ends of the coupled inductors in the circuit are connected in parallel with a power supply when two main switch transistors are conducted, the power supply charges the coupled inductors, n times of voltage are generated at the secondary ends of the coupled inductors correspondingly, voltage at two ends of bootstrap capacitors is enhanced to n+1 times of power voltage. When one of the two main switch transistors is cut off, the primary ends and the secondary ends of the two coupled inductors are serially connected together in the circuit for discharging. According to a volt-second balance circuit effect principle, the circuit can realize high voltage gain. As the circuit introduces a turn ratio of the coupled inductor, dependence on the duty cycle value by the voltage gain is fully reduced. The coupled inductor-type three-level Zeta converter can be used for changing the topological structure of a DC converter main circuit.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of power electronic converters. Background technique

[0002] High-gain DC-DC converters are widely used in green energy systems, but currently most DC-DC converters used in various fields are two-level converters. When the three-level DC-DC converter and the two-level circuit structure have the same voltage gain, the voltage stress at both ends of power switching devices such as switch tubes and diodes is only half of that of the two-level conversion circuit. At the same time, when the switching frequency of the driving signal is the same, and the ripple of the inductor current and the capacitor voltage are also the same, the value of the energy storage elements such as the inductor and capacitor is only half of that of the original two-level circuit.

[0003] But because the voltage gain of the traditional three-level DC-DC converter is the same as that of the two-level circuit, it cannot achieve a higher...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More