A Quasi-Z Source DC-DC Converter Mixed with Active Switched Capacitor and Passive Switched Inductor

A technology of active switch and passive switch, which is applied in the direction of high-efficiency power electronic conversion, adjustment of electric variable, output power conversion device, etc., can solve the problems of circuit volume, weight and cost increase, limit application, etc. The effect of wide application range and high output voltage gain

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cascading of multi-level quasi-Z sources increases the number of passive components such as inductors and capacitors, which greatly increases the volume, weight and cost of the circuit, which limits the use of the circuit in terms of system volume, weight and cost. application of low power consumption circuits

Method used

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  • A Quasi-Z Source DC-DC Converter Mixed with Active Switched Capacitor and Passive Switched Inductor
  • A Quasi-Z Source DC-DC Converter Mixed with Active Switched Capacitor and Passive Switched Inductor
  • A Quasi-Z Source DC-DC Converter Mixed with Active Switched Capacitor and Passive Switched Inductor

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with specific examples.

[0012] Such as figure 1 As shown, the quasi-Z source DC-DC converter with active switched capacitors and passive switched inductors mixed in this embodiment includes a voltage source V in , the first inductance L 1 , Active switched capacitor unit, passive switched inductor unit, output MOS tube S 2 , output diode D O , output filter capacitor C O and output load R; the active switched capacitor unit consists of a first diode D 1 , the first MOS tube S 1 , the first capacitance C 1 constituted; the passive switching inductance unit consists of a second diode D 2 , the third diode D 3 , the second inductance L 2 constitute; the voltage source V in The positive pole of the first inductor L 1 Connected at one end, the first inductor L 1 The other end of the first diode D 1 The anode and the first MOS tube S 1 The drain connection of the first diode D 1 The cathodes...

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Abstract

The invention discloses a quasi-Z source DC-DC converter mixed with active switched capacitors and passive switched inductors, which includes a voltage source, a first inductor, and is composed of a first diode, a first MOS transistor, and a first capacitor. The active switched capacitor unit, the passive switched inductor unit composed of the second diode, the third diode and the second inductor, an output MOS tube, an output diode, an output filter capacitor and an output load. The invention combines the high-gain characteristics of the quasi-Z source, the characteristics of the active switch capacitor and the passive switch inductance, and compared with the 3-Z source network step-up DC-DC converter, the number of inductances is two less, the number of capacitors is the same, and the number of diodes is the same. 5 less, one more MOS transistor, but the voltage gain is significantly improved; compared with the scalable diode-assisted Z-source step-up DC-DC converter (first-stage expansion), the voltage gain is the same, and the number of inductors and capacitors are respectively reduced One and two, the number of diodes is the same, and the number of MOS transistors is one more, so that a higher output voltage gain is achieved with a lower duty cycle.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a quasi-Z source DC-DC converter in which active switched capacitors and passive switched inductors are mixed. Background technique [0002] The Z-source DC-DC converter connects an X-shaped LC impedance network between the input source and the output terminal, which has the unique properties of both step-up and step-down, and because it has a lower duty cycle than boost conversion The device has a higher voltage gain, making it widely used in fuel cell power generation and photovoltaic power generation. The traditional Z-source DC-DC converter has defects such as discontinuous power supply current and input-output non-common ground. The quasi-Z-source DC-DC converter proposed in recent years has solved these two problems well, and through multi-stage Quasi-Z source impedance networks can be cascaded to obtain quite high voltage gains. However, the cascading of multi-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156H02M1/0032Y02B70/10
Inventor 陈艳峰刘明杰张波丘东元黄子田
Owner SOUTH CHINA UNIV OF TECH
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