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A clamping circuit and a y-source inverter capable of increasing the boost ratio and suppressing DC bus voltage spikes

A technology of clamping circuit and source inverter, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problems of low circuit utilization efficiency and limited circuit power level, etc. Achieve high utilization rate, reduce impact, and increase boost ratio

Inactive Publication Date: 2019-11-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the power level of the circuit is limited and the circuit utilization efficiency is low due to the leakage inductance in the coupling inductance of the existing Z-source inverter. Y-source Inverter for Suppressing DC Bus Voltage Spike

Method used

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  • A clamping circuit and a y-source inverter capable of increasing the boost ratio and suppressing DC bus voltage spikes
  • A clamping circuit and a y-source inverter capable of increasing the boost ratio and suppressing DC bus voltage spikes
  • A clamping circuit and a y-source inverter capable of increasing the boost ratio and suppressing DC bus voltage spikes

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specific Embodiment approach 1

[0030] Specific embodiment one: reference figure 1 with figure 2 Detailed description of this embodiment, a clamp circuit described in this embodiment includes a capacitor C 3 , Capacitance C 4 , Diode D 2 And inductance L 0 ;

[0031] Diode D 2 The cathode is also connected to capacitor C 3 And inductance L 0 One end, capacitance C 4 Connect diode D to both ends of 2 Anode and inductance L 0 On the other end,

[0032] Diode D 2 Anode and capacitance C 3 The other end is used as the voltage input port of the clamp circuit, diode D 2 The anode is the positive input terminal, the capacitor C 3 The other end of is the reverse input end,

[0033] Inductance L 0 And capacitor C 3 The other end is used as the voltage output port of the clamp circuit, the inductor L 0 The other end is the positive output end, the capacitor C 3 The other end is the reverse output end.

[0034] figure 1 L in coupled Indicates the coupled inductor in the inverter, the specific structure of the coupled inductor...

specific Embodiment approach 2

[0043] Specific embodiment two: reference Figure 3 to Figure 5 Detailed description of this embodiment, this embodiment is a Y-source inverter containing the clamping circuit described in the first embodiment, including a Y-source network circuit, a clamping circuit, and an inverter bridge circuit. The voltage output of the Y-source network circuit The port is connected to the voltage input port of the clamp circuit, and the voltage output port of the clamp circuit is connected to the voltage input port of the inverter bridge circuit. The inverter bridge circuit is used to supply power to the load or the power grid.

[0044] In this embodiment, the capacitance C 3 , Capacitance C 4 And diode D 2 It is used to clamp the voltage on the DC bus so that no voltage spikes will be generated on the DC bus.

specific Embodiment approach 3

[0045] Specific embodiment three: This embodiment is a further description of the Y-source inverter described in specific embodiment two. In this embodiment, the inverter bridge circuit is equivalent to a switch, and the Y-source inverter includes a through mode In the non-direct mode, the equivalent switch is closed in the direct mode, and the equivalent switch is open in the non-direct mode.

[0046] The Y-source inverter is divided into direct mode and non-direct mode when it is working. Among them, the direct mode and non-direct mode both include the linear region. In the linear region, the current on the leakage inductance will slowly change linearly, so there will be no large voltage spikes across the leakage inductance. The equivalent circuits in the two modes are as Figure 5 Shown. The AC output is equivalent to a current source, and the inverter bridge is equivalent to the switch tube SW. In the through mode, the equivalent switch SW is closed; and in the non-through ...

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Abstract

The invention provides a clamping circuit and a Y-source inverter improved in step-up ratio and capable of suppressing the direct-current bus voltage spike, and relates to the technical field of inverters. The invention aims to solve the problem that an existing Z-source inverter is used for solving the problems that an existing z-source inverter is limited in power level and low in circuit utilization efficiency. The cathode of a diode D2 is simultaneously connected with one end of a capacitor C3 and one end of an inductor L0. The two ends of a capacitor C4 are respectively connected with theanode of the diode D2 and the other end of the inductor L0. The anode of the diode D2 and the other end of the capacitor C3 are used as the voltage input end of the clamping circuit. The other end ofthe inductor L0 and the other end of the capacitor C3 are used as the voltage output end of the clamping circuit. The voltage output end of the Y-source network circuit is connected with the voltageinput end of the clamping circuit. The voltage output end of the clamping circuit is connected with the voltage input end of an inverter bridge circuit. The inverter bridge circuit is used for supplying power to a load or a power grid.

Description

Technical field [0001] The invention belongs to the technical field of inverters. Background technique [0002] At present, the inverter is an indispensable important equipment in power applications, but the traditional inverter has many inherent defects. For example, the upper and lower switch tubes of the same bridge arm of a traditional voltage source inverter cannot be turned on at the same time, so dead time needs to be injected, which causes a certain distortion of the output waveform. Correspondingly, the traditional current source inverter is not allowed to enter the freewheeling mode, so overlap time needs to be added. On the other hand, traditional voltage source inverters and current source inverters respectively require that the output voltage must be lower or higher than the DC bus voltage. Therefore, it may be necessary to use multi-level circuits to transform the voltage in practical applications, which not only increases Control complexity while also increasing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/5395H02M1/32
CPCH02M1/32H02M7/53871H02M7/5395
Inventor 刘鸿鹏周自超吴文韬刘桂花王盼宝王卫
Owner HARBIN INST OF TECH
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