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PWM cycloconverter and power fault detctor

A technology of cycle converter and detection circuit, which is applied in the direction of conversion of AC power input to DC power output, conversion of AC power input to AC power output, and conversion equipment that can be converted to DC without intermediate conversion, and can solve the problem of hindering PWM cycle Converter normal operation and other problems, to achieve the effect of eliminating operation interruption, simple system structure

Inactive Publication Date: 2003-05-07
YASKAWA DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0054] However, when a PWM cycloconverter is used as an AC / AC direct power converter, the three-phase AC power is directly connected to a load such as a motor through a bidirectional switch, and therefore, an imbalance in the three-phase AC power prevents the PWM cycle conversion normal operation of the

Method used

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  • PWM cycloconverter and power fault detctor
  • PWM cycloconverter and power fault detctor
  • PWM cycloconverter and power fault detctor

Examples

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no. 1 example

[0161] first refer to attached Figure 9 , Figure 9 is a block diagram showing the structure of the PWM cycloconverter of the first embodiment of the present invention. exist Figure 9 neutralize figure 1 The same components have the same reference numerals, and these elements will not be described again.

[0162] Compared with the PWM cycloconverter of the background art shown in the figure, the PWM cycloconverter in this embodiment also has a power switch 20 and an uninterruptible power supply 10, the power supply 10 is a unidirectional AC power supply, and the controller 160 Replaced by controller 60.

[0163] When the power failure detection signal 120 is not received as an input, the power switch 20 outputs the three-phase (R, S, T) output voltage from the three-phase AC power source 1 to the input filter 2 as usual, and when the power failure detection signal 120 is received , the power switch 20 outputs a unidirectional AC voltage from the uninterruptible power su...

no. 2 example

[0171]Next, the PWM cycloconverter in the second embodiment of the present invention will be described. In the aforementioned PWM cycloconverter in the first embodiment, when the output power supply abnormality detection signal 120 is added as an input to the input power supply phase detection circuit When the power supply of 40 is converted from the three-phase AC power supply 1 to the uninterruptible power supply 10, the PLL forming the input power phase detection circuit 40 needs a certain time to lock the uninterruptible power supply 10 to be detected and the phase information to be output. Consistent with the performance of a typical PLL, if the tracking range of the frequency fluctuation of the input signal is set larger, the time interval becomes longer. Thus, when switching to the non-interruptible power source 10, that is, the emergency power source, there will be a possibility of momentary interruption of operation in the PWM cycloconverter of the first embodiment des...

no. 3 example

[0181] Refer below Figure 11 A PWM cycloconverter illustrating a third embodiment of the present invention, Figure 11 is a block diagram showing the structure of the PWM cycloconverter of this embodiment. exist Figure 11 in, with Figure 10 The same reference numerals are used for the same structural elements in , and the description of these elements will not be repeated.

[0182] and Figure 11 Compared with the PWM cycloconverter of the second embodiment shown, the PWM cycloconverter of this embodiment replaces the non-interruptible power supply 10 by the battery 11 , and replaces the non-interruptible power supply phase detection circuit by the fixed phase information generation circuit 42 . The fixed phase information generation circuit 42 generates and outputs fixed phase information.

[0183] Combine below Figure 11 The operation of the PWM cycloconverter of this embodiment will be described.

[0184] The power switch 20 and the phase detection circuit switch...

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Abstract

A PWM cycloconverter is disclosed that can switch power supplies without interrupting operation in the event of a power supply abnormality. When a power supply abnormality occurs in three-phase AC power supply 1, power supply abnormality detection circuit 30 outputs power supply abnormality detection signal 120, whereby power supply switch 20 selects and outputs the output voltage of uninterruptible power supply 10. Phase detection circuit switch 43 selects and outputs phase information that is output from uninterruptible power supply phase detection circuit 41. Uninterruptible power supply phase detection circuit 41 detects the phase of uninterruptible power supply 10 from before the occurrence of the power supply abnormality, whereby accurate phase information of uninterruptible power supply 10 can be output even immediately after phase detection circuit switch 43 switches the phase information that is output. As a result, operation is not interrupted when switching power supplies.

Description

technical field [0001] The present invention relates to a cycloconverter (cycloconvert), which is a power converter that can directly generate an AC output of any frequency from a fixed frequency AC power supply, especially a PWM cycle controlled by pulse width modulation (PWM). converter. Background technique [0002] Recently, the control of devices such as motors using a cycloconverter, which is a power converter that directly generates an AC output of any frequency without a DC output, from a fixed-frequency AC power source, has been researched and developed, especially Yes, by utilizing a PWM cycloconverter controlled by pulse width modulation (PWM). A PWM cycloconverter is also known as a "matrix converter". [0003] In this PWM cycloconverter, the input power supply and the output are directly connected to each other through a bidirectional switch, allowing current to flow directly in both directions. As a result, the operation of the PWM cycloconverter must be int...

Claims

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Application Information

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IPC IPC(8): B66B5/02H02M5/27H02P27/16
CPCB66B5/0018H02M5/271H02P27/16B66B5/02H02M5/273H02M2007/53876H02M7/53876H02M5/27
Inventor 山本荣治石井佐田夫原英则渡边英司山崎哲也田中耕次
Owner YASKAWA DENKI KK
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