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Resonant-pole soft switching inversion circuit for driving of brushless direct current motor

A brushless DC motor, inverter circuit technology, applied in the direction of high-efficiency power electronic conversion, AC power input conversion to DC power output, electrical components, etc., can solve the problem of not completely suitable for brushless DC motors, and achieve the effect of simple structure

Inactive Publication Date: 2017-05-31
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

[0005] In order to meet the requirements of the brushless DC motor drive system, the present invention provides a resonant soft switching inverter circuit for brushless DC motor driving, which solves the problem that the traditional resonant soft switching inverter technology is not completely suitable Problems with brushless DC motors

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  • Resonant-pole soft switching inversion circuit for driving of brushless direct current motor
  • Resonant-pole soft switching inversion circuit for driving of brushless direct current motor
  • Resonant-pole soft switching inversion circuit for driving of brushless direct current motor

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Embodiment Construction

[0018] 1. Circuit structure

[0019] refer to figure 1 , provides a main circuit diagram of a resonant extremely soft-switching inverter for driving a brushless DC motor, which can be used to drive a brushless DC motor. The main circuit includes: a DC power supply 1, an auxiliary resonant circuit 2, a three-phase inverter 3 with a buffer capacitor connected in parallel to the three main switches of the lower bridge arm, and a brushless DC motor load 4. In the auxiliary resonant circuit of the resonant extremely soft switch inverter circuit driven by the brushless DC motor of the present invention, three auxiliary switches S a , S b , S c The emitters are connected together, the 3 auxiliary switches S a , S b , S c The connection point of the emitter of the single-phase transformer is connected to the a terminal of the primary winding of the single-phase transformer, the b terminal of the primary winding of the single-phase transformer is connected to the N pole of the DC...

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Abstract

The invention relates to a resonant-pole soft switching inversion circuit for driving of a brushless direct current motor. The inversion circuit is characterized by comprising a direct current power supply, a three-phase pulse width modulation inverter and the brushless direct current motor, wherein an auxiliary resonance circuit is arranged between the direct current power supply and the three-phase pulse width modulation inverter, and comprises a single-phase transformer, three auxiliary switches and two diodes. According to the inversion circuit, a large capacitor used for forming neutral point voltage is not arranged between direct current buses, and no neutral point potential change exists, so that main switches on bridge arms of the inverter can adopt a relatively simple single-side modulation method; an auxiliary circuit of the three-phase inverter is simple in structure, and only comprises three auxiliary switch devices, two auxiliary diodes and a high-frequency transformer; and zero voltage switching of main switch devices of the inverter and zero current switching of the auxiliary switch devices are realized by utilizing resonance between an equivalent inductor of the high-frequency transformer in the auxiliary circuit and a buffer capacitor parallel to the main switches of the lower bridge arm.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a resonant extremely soft switching inverter circuit for driving a brushless DC motor. Background technique [0002] Brushless DC motor (BLDCM) has the advantages of low inertia, fast response, high power density, good stability and low maintenance cost, so it has been widely used in the industrial field. In addition, this motor also has the operating characteristics of a DC permanent magnet motor, but without the mechanical rectifier and brushes in the motor, therefore, many problems related to the brushes are also eliminated at the same time, such as audio interference problems, in easy It is easy to ignite potential ignition source problems when working in a flammable environment. Brushless DC motors are usually driven by hard-switching pulse width modulation (PWM) inverters, but such inverters have large switching losses and low efficiency, especially w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387H02M1/0058H02M7/4815Y02B70/10
Inventor 王强岳远韶韩建荣王天施刘晓琴
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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