Quadratic Boost converter with low capacitance voltage stress

A voltage stress, quadratic technology, applied in the electrical field, can solve the problems of switching loss, large dv/dt, low conversion efficiency, etc., and achieve the effect of reducing voltage stress, reducing the number of capacitors, and simple control

Inactive Publication Date: 2019-12-03
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When the working duty cycle D approaches 1, the gain of the basic Boost converter tends to be infinite in theory, but there are the following problems in practical engineering applications: ①The voltage and current stress of the switch tube and diode are large; ②The switching loss , The reverse recovery loss of the diode is large, resulting in low conversion efficiency; ③The dv / dt is large, resulting in serious electromagnetic interference (EMI); ④The ability to resist input voltage disturbance and the dynamic performance are poor
However, the voltage stress of the capacitor is the same as that of the original cascaded system, which is much higher than the input voltage, which increases the difficulty of capacitor selection and reduces the system efficiency

Method used

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  • Quadratic Boost converter with low capacitance voltage stress
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  • Quadratic Boost converter with low capacitance voltage stress

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0024] Please refer to figure 2 . figure 2 It is a schematic diagram of a circuit structure of a secondary boost converter with low capacitor voltage stress provided by an embodiment of the present invention (in the figure, the switch tube is an N-channel MOS tube, and the capacitor is a polarized capacitor as an example). The secondary boost converter with low capacitive voltage stress includes a DC voltage source U in , the first inducta...

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Abstract

The invention discloses a quadratic Boost converter with low capacitance voltage stress. The quadratic Boost converter comprises a DC voltage source, two inductors, a switching tube, three diodes, twocapacitors and a load. The drain of the switching tube is connected with one end of the second inductor. The anode of the second diode is connected with the cathode of the third diode. The anode of the first capacitor is connected with the cathode of the first diode, the other end of the second inductor and the cathode of the second capacitor. One end of the first inductor is connected with the anode of the first diode and the anode of the third diode. The anode of the second capacitor is connected with the cathode of the second diode and one end of the load. The positive electrode of the DCvoltage source is connected with the other end of the first inductor and the cathode of the first capacitor. The negative electrode of the DC voltage source is connected with the source of the switching tube and the other end of the load. The first inductor and the second inductor operate in the CCM mode. The converter has only one switching tube and has the characteristics of high gain and low capacitance voltage stress so as to be especially suitable for high voltage and high power application occasion.

Description

technical field [0001] The present application relates to the field of electrical technology, in particular to a secondary boost converter with low capacitor voltage stress. Background technique [0002] Since the output voltage of DC power sources such as photovoltaic cells, fuel cells, and storage batteries is low, even lower than 48V, and for AC220V grids, the input of half-bridge and full-bridge grid-connected inverters is generally DC760V and DC380V. Voltage conversion is one of the main problems to be solved in renewable energy grid-connected power generation systems. [0003] When the working duty cycle D approaches 1, the gain of the basic Boost converter tends to be infinite in theory, but there are the following problems in practical engineering applications: ①The voltage and current stress of the switch tube and diode are large; ②The switching loss , Diode reverse recovery loss is large, resulting in low conversion efficiency; ③ dv / dt is large, resulting in serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 秦岭张宇妍韩启萌田民尹铭沈家鹏高娟段冰莹周磊
Owner NANTONG UNIVERSITY
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