Three-level inverter and control method thereof
A three-level inverter, full-control technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of high conduction loss and reduce conduction Loss, the effect of improving efficiency
Inactive Publication Date: 2014-04-02
上海交通大学无锡研究院
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Problems solved by technology
[0007] In summary, the traditional three-level circuit has high conduction loss, which needs to be improved
Method used
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[0029] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0030] Such as Figure 5 As shown, a three-level inverter is connected to the power supply, the third and fourth electrolytic capacitors C3 and C4, including the seventh and eighth diodes D7 and D8 and the first to sixth full-control power devices, which are introduced respectively below.
[0031] In the scope of power electronics, fully controlled power devices generally refer to IGBT or Mosfet. In this embodiment, the second and fifth fully-controlled power devices S2 and S1c use IGBTs, and the third and fourth fully-controlled power devices use Mosfets with anti-parallel diodes, as Figure 5 As shown in Snpc1 and Snpc2, the first and sixth full-control power devices can use Mosfet or IGBT, and in the same circuit structure, the types of the first and sixth full-control power devices can be different, the first One and six full-control ...
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The invention discloses a three-level inverter. A positive terminal of a first full-control type power device is connected with a cathode of a first diode group; a negative terminal of the first full-control type power device is connected with positive terminals of a second full-control type power device and a third full-control type power device respectively; a negative terminal of the third full-control type power device is connected with a positive terminal of a fourth full-control type power device; a negative terminal of the fourth full-control type power device is connected with a negative terminal of a fifth full-control type power device and a positive terminal of a sixth full-control type power device respectively; a negative terminal of the sixth full-control type power device is connected with an anode of a second diode group; a negative terminal of the second full-control type power device, a positive terminal of the fifth full-control type power device, an anode of the first diode group and a cathode of the second diode group are connected to serve as the output end of the three-level inverter; the third full-control type power device and the fourth full-control type power device are MOSFETs (metal oxide semiconductor field effect transistors). The three-level inverter is low in conduction loss. The invention also discloses a control method of the three-level inverter.
Description
technical field [0001] The invention relates to a three-level inverter and a control method thereof, in particular to a three-level inverter with small conduction loss and a control method thereof. Background technique [0002] Such as figure 1 As shown, the traditional three-level circuit includes the first to six diodes D1, D2, D3, D4, D5, D6 and the first to four IGBTs S3, S4, S5, S6, which are connected with the power supply and the first and second electrolytic capacitors C1 , C2 are connected together, specifically, the positive pole of the power supply is respectively connected to the positive pole of C1, the positive terminal of S3 and the cathode of D1, the negative terminal of S3, the anode of D1, and the positive terminal of S4 are connected to the cathode of D2, and are connected together The cathode of D5; the negative pole of the power supply is respectively connected to the negative pole of C2, the negative terminal of S6 and the anode of D4, the positive t...
Claims
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Login to View More IPC IPC(8): H02M7/483H02M7/537
Inventor 王勇黄金伟汤小琪林建韩建华
Owner 上海交通大学无锡研究院