Power-on and braking circuit of frequency conversion drive system

A variable frequency drive and braking circuit technology, applied in motor generator control, motor generator/starter, control system, etc., can solve the problems of braking energy consumption, high cost, complex control, etc., and achieve power-on current impact Small, low cost and simple circuit structure

Inactive Publication Date: 2016-04-13
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method is complicated to control, high in cost, and the braking energy is consumed inside the motor, so it is not suitable for frequent braking applications

Method used

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  • Power-on and braking circuit of frequency conversion drive system

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0016] Such as figure 1 As shown, a power-on and brake circuit of a variable frequency drive system includes a power-on brake circuit 1 , a rectifier circuit 2 and a drive system 3 . Wherein, the power-on braking circuit is combined with a soft power-on circuit and a braking circuit, and its two input terminals are respectively connected to the two output positive poles and negative poles of the rectifier circuit 2, and its two output terminals are respectively connected to the two output terminal...

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Abstract

The invention discloses a power-on and braking circuit of a variable frequency drive system. The power-on and braking circuit comprises a power-on braking circuit, a rectifying circuit and the drive system. A soft power-on circuit and a braking circuit are combined to form the power-on and braking circuit, the two input ends of the power-on and braking circuit are connected with two output positive electrodes and two output negative electrodes of the rectifying circuit respectively, the two output ends of the power-on and braking circuit are connected with two input positive electrodes and two input negative electrodes of the drive system respectively, the two input ends of the rectifying circuit are connected with a live wire and a null line of a single-phase alternating current power source respectively, and the drive system is a variable frequency speed control system. Soft power-on of a rectifier and rapid braking of a motor can be achieved, power-on currents are small in impact, the reliable braking function is achieved, the circuit structure is simple without manual control, and the power-on and braking circuit is suitable for the variable frequency speed control system adopting the alternating current power source for power supply.

Description

technical field [0001] The invention relates to a device in the field of AC frequency conversion and speed regulation using power electronic conversion technology, in particular to a power-on and braking circuit for a frequency conversion drive system. Background technique [0002] The power-on current limiting circuit and fast braking circuit are important components of the variable frequency drive system, and their application fields include industrial sewing machines, CNC machine tools, etc. [0003] In a large power system, the energy storage capacitor on the output side of the rectifier circuit has a large capacity and its initial voltage is zero, so the energy storage capacitor will cause a high-amplitude inrush current during the power-on stage, causing damage to power devices, pollution Power grid and other adverse consequences, so power-on current limiting measures must be taken. Up to now, the power-on current-limiting circuit has a variety of solutions, including...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26H02P3/18
Inventor 渠浩杨喜军
Owner SHANGHAI JIAOTONG UNIV
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