Three-level double step-down full bridge inverter

A full-bridge inverter, double step-down technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. Problems such as high switching frequency

Inactive Publication Date: 2007-05-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] DBHBI and half-bridge inverters (hereinafter referred to as half-bridge inverters) also have the following disadvantages: the voltage stress of the device is twice the input voltage, and it is difficult to apply in high-voltage input applications; the bridge arm can only output + 1 and -1 two-state level, working in bipolar modulation

Method used

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  • Three-level double step-down full bridge inverter
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  • Three-level double step-down full bridge inverter

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Embodiment Construction

[0013] Accompanying drawing 1 is the structural representation of three-level double step-down type full-bridge inverter circuit, comprises the output of power supply circuit 1 and connects the first step-down circuit 2 and the second step-down circuit 3, the first step-down circuit 2 and the second step-down circuit 2. The output terminal of the step-down circuit 3 is connected to the filter capacitor and the load circuit 4. One end of the power frequency switch circuit is connected to the filter capacitor and the load terminal, and the other two ends are respectively connected to the positive and negative terminals of the input power supply. It is characterized in that the input power supply circuit 1 is constituted by a single external power supply. The first step-down circuit 2, which regulates and works during the half cycle of the positive polarity current output by the inverter, is connected by the cathode of the first power switch tube D1, the source of the first power ...

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Abstract

The invention relates to a three-voltage dual-reduction full-bridge inverter, wherein it comprises power circuit (1), two reduction circuits (2, 3), filter capacitors and load circuit (4), and work-frequency switch circuit (5); the inputs of circuits (2, 3) are connected to circuit (1), while outputs are connected to filter capacitor and load circuit (4). The invention is characterized in that: the ground part of filter capacitor (Cf) via two switch tubes is connected to the anode and the cathode of bus voltage; the external bus voltage is reduced from 2Ud to Ud. The invention has simple structure and control method.

Description

1. Technical field [0001] The invention relates to a three-level double-step-down full-bridge inverter, which belongs to an inverter in an electric energy conversion device. 2. Background technology [0002] With the development of power electronics technology, power converters are developing in the direction of high frequency and high efficiency. At the same time, many applications such as aerospace and UPS have put forward high requirements for power supply reliability. In traditional bridge inverter circuits, because the switch tubes are directly connected in series, there is a potential for the bridge arm to pass through, and an additional control dead zone is required, and this dead zone will cause distortion of the output voltage waveform. At the same time, the body diode of the switching tube in the bridge circuit participates in the work. For MOS devices, measures to improve MOSFET performance often lead to poor body diode performance, and it is difficult to optimiz...

Claims

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Application Information

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IPC IPC(8): H02M7/515H02M1/12
Inventor 洪峰於俊严仰光单任仲王慧贞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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