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Novel power circuit of high-voltage SRD (Step Recovery Diode)

A power circuit, a new type of technology, applied in the direction of electrical components, AC motor control, single motor speed/torque control, etc., can solve the problem of IGBT voltage equalization that is difficult to overcome, high-voltage SRD can not be applied, etc., to achieve low cost and high power consumption. Less electronic components and simple circuit structure

Inactive Publication Date: 2010-11-10
孟润泉
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, it is limited to the application of low-voltage (380V, 660V, 1140V) SRD at home and abroad; there is no application of high-voltage (6KV, 10KV) SRD, although many industrial sectors actually need to use high-voltage SRD; but because there is no country in the world that can In the manufacture of power electronic components with a withstand voltage of 6KV or 10KV, some people have tried to use multiple power electronic components IGBT in series to solve the insufficient withstand voltage of a single IGBT, but the voltage equalization problem of each IGBT in series is difficult to overcome; resulting in high voltage SRD Cannot be applied in actual production

Method used

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  • Novel power circuit of high-voltage SRD (Step Recovery Diode)
  • Novel power circuit of high-voltage SRD (Step Recovery Diode)
  • Novel power circuit of high-voltage SRD (Step Recovery Diode)

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specific Embodiment 1

[0018] combined with image 3 Set forth specific embodiment 1 of the present invention: step-down transformer once connects high-voltage three-phase power supply, step-down transformer secondary 24 angle-connected windings are respectively connected with (A 1 …A 8 ), (B 1 …B 8 )(C 1 …C 8 ) 24 power unit three-phase input terminals are connected. (A 1 …A 8 ) indicates that the voltage after the output ends of the eight power units are connected in series is applied to the A-phase winding L of the SR motor A . Similarly, the 8 power units of the other two phases are connected in series and respectively added to the B-phase winding L of the SR motor B and C-phase winding L C . If the primary high voltage is 6KV (10KV), the voltage drop of the secondary corner extension winding is 530V (890V). After three-phase bridge rectification and filtering, the DC output voltage is 750V (1250V) and then pulse width modulated by the power electronic component IGBT. The output volt...

specific Embodiment 2

[0019] combined with Figure 4 Describe the specific embodiment 2 of the present invention: the step-down transformer is connected to the high-voltage three-phase power supply at the first time, and the transformer is only provided with 8 corner-connected windings at the secondary stage, and the three-phase input terminals of the 8 power units are connected with 8 corner-connected three-phase windings , the IGBTs that supply power to the A-phase, B-phase and C-phase windings of the SR motor are all connected in parallel on the DC side of the same three-phase bridge rectifier filter circuit. If the primary high voltage is 6KV (10KV), the voltage drop of the secondary extension corner winding is 530V (890V); the same as embodiment 1, the voltage added to the three-phase winding of the SR motor is 0 to 6KV (0 to 10KV) adjustable voltage, This also adjusts the SR motor speed.

Embodiment 2

[0020] Compared with the wiring diagram of embodiment 1, the wiring diagram of embodiment 2 has the advantage that the number of secondary windings of the step-down transformer is reduced from 24 to 8, and the number of outgoing lines is reduced from 72 to 24; at the same time, the rectification and filtering elements are also reduced, but with The disadvantage is that the primary side harmonics of the step-down transformer pollute the grid, and the power factor is low.

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Abstract

The invention relates to a novel power circuit suitable for a high-voltage SRD (Step Recovery Diode), which comprises a power unit serial circuit and a step-down transformer. The output ends of a plurality of independent power units are connected in series, a three-phase input end of each power unit and a secondary winding of the step-down transformer in delta connection are connected, and a three-phase bridge rectification element and a power electronic element in each power unit are both low-voltage elements. Primary windings of the step-down transformer are connected in a star shape, and the secondary winding comprises a plurality of mutually insulated independent windings in delta connection. The voltage of the secondary winding in delta connection is low and has a certain phase angle. The step-down transformer has three functions of voltage reduction, phase shift and isolation.

Description

technical field [0001] The invention relates to electric transmission and power electronics technology, in particular to a new type of power circuit. Background technique [0002] Switched Reluctance Drive (SRD) is a new type of AC speed control system developed in the mid-1980s. It is composed of power circuit, drive and control circuit and switched reluctance motor (Switched Reluctance Motor referred to as SR motor). Type asynchronous motor is also simple. As soon as it appeared, it attracted widespread attention from the electrical industry at home and abroad. In the past ten years, it has been widely used in mining, transportation, petroleum, machine tools, aviation and other industrial fields at home and abroad. But at present, it is limited to the application of low-voltage (380V, 660V, 1140V) SRD at home and abroad; there is no application of high-voltage (6KV, 10KV) SRD, although many industrial sectors actually need to use high-voltage SRD; but because there is no...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P25/08
Inventor 王振民孟润泉
Owner 孟润泉
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