Frequency converter and its control method

A technology of frequency converter and converter, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, AC power input conversion to AC power output, etc., can solve the problems of expensive and complex frequency converters, and minimize the physical effect of size

Inactive Publication Date: 2005-02-09
VAAHTO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this PFC circuit makes the frequency converter more expensive and complex

Method used

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  • Frequency converter and its control method
  • Frequency converter and its control method
  • Frequency converter and its control method

Examples

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Embodiment Construction

[0023] Figure 4a shows a single-phase PWM frequency converter according to the present invention. As in the prior art (see Figure 1a ), which includes a rectifier bridge 10 for converting the AC voltage U of the supply line in Rectification into the DC voltage Udc of the DC intermediate circuit 11, and a three-phase converter bridge 12 for converting the intermediate circuit DC voltage Udc into a single-phase or three-phase variable frequency AC voltage U out . The frequency converter is connected to a small three-phase AC load such as a pump or fan motor 13 . The converter bridge is a full wave bridge having pulse width modulated semiconductor switches V11 to V16, such as IGBTs, and freewheeling diodes D11 to D16 connected in antiparallel to the semiconductor switches. By means of the PWM control unit 14 the semiconductor switches V11 to V16 are controlled with pulse width modulation. The rectifier bridge may be a full-wave diode bridge having the same voltage as the si...

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PUM

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Abstract

Method of controlling a voltage controlled PWM (Pulse Width Modulated) frequency converter comprising a single phase rectifier bridge (10) connectable to a sinusoidal single phase supply, a DC intermediate circuit (11) and a controlled inverter bridge (12) for generating an AC output voltage with varying amplitude and frequency to a load, said inverter bridge (12) having PWM controlled semiconductor switches (V11-V16) and flywheel diodes (D11-D16) connected in inverse-parallel with the semiconductor switches, wherein the DC intermediate circuit (11) is provided with a DC capacitor unit, and wherein the frequency converter is controlled so that the supply line current (Iin) is essentially sinusoidal and in phase with the supply line voltage (Uin). The inverter bridge is controlled so that the curve of filtered average current (Idc) in the DC intermediate circuit follows essentially the curve of the rectified AC supply voltage (Udc), the rectifier bridge is (10) connected to the inverter bridge (12) directly without a DC capacitor unit acting as an intermediate energy storage, and the curve of the power fed to the load has essentially the form sin<2>(2Pift) (f=line frequency, t=time).

Description

technical field [0001] The invention relates to a voltage-controlled PWM (Pulse Width Modulation) frequency converter comprising a single-phase rectifier bridge, a DC intermediate circuit and a controlled converter bridge for generating an AC output voltage with varying voltage and frequency. The invention also relates to a method for controlling such a frequency converter. Background technique [0002] Figure 1a A prior art single phase PWM frequency converter is shown. It contains a rectifier bridge 10 for converting the AC voltage U on the supply line in rectification to a DC voltage Udc for the DC intermediate circuit 11, and a converter bridge 12 for converting the intermediate circuit DC voltage Udc into a single-phase or three-phase variable-frequency AC voltage U out . Such single-phase frequency converters can be connected to small single-phase or three-phase AC loads, such as pump motors or fan motors 13 . The converter bridge may be a full-wave bridge with pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M1/00H02M1/42H02M5/458
CPCH02M5/458Y02B70/126H02M1/425Y02B70/10
Inventor D·施雷伯O·普尔赫恩P·斯文托恩R·科穆莱恩
Owner VAAHTO
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