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A frequency converter AC speed control device

A technology of AC speed regulation and frequency converter, applied in the field of frequency converter, can solve problems such as cost increase, and achieve the effect of cost saving

Active Publication Date: 2018-03-30
KINCO ELECTRIC SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] like figure 1 As shown, the output current detection of a frequency converter in the prior art is realized by Hall sampling. The detection point for detecting the output line current is placed on the output motor line. The whole scheme needs to strengthen the strong current of the main circuit and the weak current of the control circuit. insulation, resulting in increased cost

Method used

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  • A frequency converter AC speed control device
  • A frequency converter AC speed control device
  • A frequency converter AC speed control device

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 2 As shown, the inverter AC speed control device includes a rectifier circuit, a power-on buffer circuit, a filter circuit, an inverter circuit, a voltage sampling circuit, a short-circuit protection circuit and a control module (MCU). Among them, the rectification circuit is a rectification bridge composed of 6 diodes, and the filter circuit is composed of capacitors and resistors. The inverter circuit includes a drive module and a three-phase inverter bridge composed of six IGBT tubes. Among them, the three lower bridge arms of the three-phase inverter bridge are respectively provided with current-sensing resistors R1, R2, and R3, and the output three-phase currents Iu, Iv, and Iw are detected by detecting the voltages of the resistors of R1, R2, and R3. size. The PWM pulse drive module is used to output control pulse signals to respectively control the opening and closing of the six IGBT tubes, and the control module is used to sample the voltages o...

Embodiment 2

[0032] Such as Figure 5 As shown, the present invention further optimizes the detection output current scheme of the lower bridge arm, and proposes a single resistance detection output current device, which includes a rectifier circuit, a power-on buffer circuit, a filter circuit, an inverter circuit, a short circuit protection circuit and a control module. The inverter circuit includes a PWM pulse drive module and a three-phase inverter bridge composed of six IGBT tubes. The three lower bridge arms of the three-phase inverter bridge are grounded together through a current-sensing resistor R, and the PWM pulse drives The module is used to output control pulse signals to control the opening and closing of six IGBT tubes respectively. The control module is used to sample the voltage of the current-sensing resistor when only one IGBT tube of the lower bridge arm is turned on in each PWM cycle, so that The three-phase line current output by the motor is reconstructed. The power-...

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Abstract

The invention provides an AC speed adjusting device of a frequency converter. The AC speed adjusting device comprises a rectifying circuit, a filtering circuit, an inverter circuit and a control module, wherein the inverter circuit comprises a PWM pulse driving module, and a three-phase inverter bridge consisting of six IGBT tubes; three lower bridge arms of the three-phase inverter bridge are connected with a current sensing resistor in series; the PWM pulse driving module is used for outputting control pulse signals for controlling the on and off operation of the six IGBT tubes; the control module is used for sampling the voltage of the current sensing resistor, so that three-phase line current output by a motor is reconstructed; the sampling time is used for controlling the underflow interruption of the widest pulse in the three pulse signals of the IGBT tubes of the three lower bridge arms. The AC speed adjusting device of the frequency converter is high in reliability, and is low in cost.

Description

technical field [0001] The invention belongs to the field of frequency converters, and in particular relates to an AC speed regulating device of a frequency converter which detects output current through a lower bridge arm. Background technique [0002] Inverter is a device that converts fixed frequency alternating current into continuously adjustable frequency alternating current. Frequency conversion speed regulation has been recognized as one of the most ideal and promising speed regulation methods. And product quality and other aspects have a wide range of applications. [0003] In the current domestic inverter market, hundreds of manufacturers are fiercely competing in the low-voltage inverter market. The development of domestic inverters has encountered unprecedented difficulties. Competing with foreign brands has encountered brand and performance bottlenecks, and competition with domestic inverters has encountered price and price constraints. A test of reliability. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
CPCH02P27/06
Inventor 王茂峰
Owner KINCO ELECTRIC SHENZHEN