Three-level boost circuit

A boost circuit, three-level technology, applied in the direction of electrical components, adjusting electrical variables, instruments, etc., can solve problems such as unbearable high voltage, affecting the normal operation of the system, common-mode interference, etc., and achieve the effect of solving common-mode interference

Inactive Publication Date: 2019-05-10
SINENG ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In order to reduce the cost of photovoltaic power generation systems, inverters for high-voltage systems are becoming more and more popular. Most of the photovoltaic MPPT (Maximum Power Point Tracking, maximum power point tracking) optimization uses Boost circuits, and most of the more common power switches on the market are low-voltage It is difficult for devices to withstand higher voltages. At present, symmetrical BOOST booster circuits are generally used to realize the MPPT optimization function.
The topology of the symmetrical BOOST boost circuit is as follows figure 1 As shown, due to the power switch tube D1 and power switch tube D2 between the bus output and the DC source DC, there is a serious common-mode signal between the output voltage and the ground, and a common-mode interference is formed between the ground and the normal of the system. Work

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Embodiment Construction

[0011] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intervening elements at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpos...

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Abstract

The invention discloses a three-level boost circuit. The circuit comprises a direct-current power supply DC, a boost inductance L1, a power switch tube Q1, a power switch tube Q2, an output bus filtercapacitor C1, an output bus filter capacitor C2, a diode D1, a diode D2, a clamping diode D3 and an energy converter. According to the three-level booster circuit disclosed by the invention, the direct-current power supply DC and the output share the cathode; the problem that a symmetrical Boost circuit has the common-mode interference is solved; and the boost function in a high-voltage system can be realized through serial connection of the power switch tube Q1 and the power switch tube Q2.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a three-level voltage boosting circuit. Background technique [0002] In order to reduce the cost of photovoltaic power generation systems, inverters for high-voltage systems are becoming more and more popular. Most of the photovoltaic MPPT (Maximum Power Point Tracking, maximum power point tracking) optimization uses Boost circuits, and most of the more common power switches on the market are low-voltage It is difficult for devices to withstand higher voltages. At present, symmetrical BOOST boost circuits are generally used to realize the MPPT optimization function. The topology of the symmetrical BOOST boost circuit is as follows figure 1 As shown, due to the power switch tube D1 and power switch tube D2 between the bus output and the DC source DC, there is a serious common-mode signal between the output voltage and the ground, and a common-mode interference is formed between ...

Claims

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Application Information

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IPC IPC(8): H02M3/158
Inventor 赵龙李爱刚鹿明星张林江
Owner SINENG ELECTRIC CO LTD
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