Single-phase semi-bridge five-electrical level inverter and its application circuit
An inverter, five-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of large number of capacitors, large losses, large volume, etc., to achieve volume The effect of small size, low loss, and fewer semiconductor devices
Active Publication Date: 2014-03-26
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0008] figure 2 The capacitors in the topology shown can play the role of voltage equalization, but the disadvantage is that the number of capacitors used is large
[0009] To sum up, the two five-level inverter topologies in the prior art both use more semiconductor devices, resulting in larger volume, more losses, and lower efficiency
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[0076] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0077] see image 3 , which is a topology diagram of a single-phase half-bridge five-level inverter provided by an embodiment of the present invention.
[0078] The single-phase half-bridge five-level inverter provided by the embodiment of the present invention includes: a first switching tube T1, a second switching tube T2, a third switching tube T3, a fourth switching tube T4, a fifth switching tube T5, a The sixth switch tube T6, the seventh switch tube T7 and the eighth switch tube T8;
[0079] Each switch tube is connected in antiparallel with a diode; as image 3 As shown, T1-T8 are respectively antiparallel to D1-D8.
[0080] The positive terminal of the DC power supply is connected to the negative terminal of the DC power su...
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The invention provides a single-phase semi-bridge five-electrical level inverter and its application circuit, wherein the single-phase semi-bridge five-electrical level inverter includes eight switch tubes and eight diodes and does not include the clamping diodes and the flying capacitors in the prior art. The five-electrical level inverter in the prior art cannot abandon the clamping diodes because these diodes provide an access for the current and prevent the capacitor from being short circuit. The five-electrical level inverter provided by the invention can provide an access for the current via the diodes that are reversely parallel connected with eight switch tubes and prevent the capacitor from being short circuit. The whole inverter has few semiconductor apparatuses, small loss, high efficiency, small volume and low cost, which abandons the capacitor to generate the multi-electrical level because the flying capacitor in the prior art for generating multi-electrical level has high cost.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-phase half-bridge five-level inverter and an application circuit thereof. Background technique [0002] In medium-voltage and large-capacity applications, multi-level inverters are widely used. The current five-level inverters are mainly diode-clamped and flying capacitor structures. To be introduced below. [0003] see Figure 1a , which is a topology diagram of a diode-clamped five-level inverter provided in the prior art. [0004] Figure 1a Shown is the topology of a half-bridge five-level inverter. Diodes are used for voltage clamping for each switching tube. For example, the first diode DB1 is used to clamp the potential of the lower end of the switching tube T1 to the lower end of the first capacitor C1; the second diode DB2 is used to clamp the potential of the lower end of the switching tube T5 to the lower end of the first capacitor C1. The other ...
Claims
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IPC IPC(8): H02M7/5387
Inventor 汪洪亮曹仁贤倪华傅立秦
Owner SUNGROW POWER SUPPLY CO LTD