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Drive circuit for electrical load

A technology for driving circuits and electrical loads, applied in AC motor control, electrical components, electrical signal transmission systems, etc., can solve problems such as increasing costs, and achieve the effects of high performance price ratio, high efficiency, and low total harmonic distortion

Inactive Publication Date: 2014-09-03
NIDEC CONTROL TECHN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using more active devices like insulated gate bipolar transistors can significantly increase the cost

Method used

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  • Drive circuit for electrical load
  • Drive circuit for electrical load
  • Drive circuit for electrical load

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Embodiment Construction

[0024] The following description of the preferred embodiments is only exemplary, and is by no means a limitation to the present invention and its application or usage. The same reference numerals are used in the various drawings to denote the same components, and therefore, the configuration of the same components will not be described repeatedly.

[0025] The technical solution of the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0026] Such as figure 1 As shown, the driver of the three-phase motor includes a non-phase-shifting transformer 10, the secondary of which has an output terminal at each tap A-N, which is consistent with the required voltage ratio. The tap output terminal is the three-phase voltage provided to the power battery A1, B1, C1-AN, BN, CN. The power battery provides supply voltages A, B, and C to an electrical load 12, such as the illustrated 10kV three-phase induction motor. Any other suitable ...

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PUM

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Abstract

A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer.

Description

Technical field [0001] The invention relates to a drive circuit for an electric load. The present invention is particularly, but not limited to, its application to a drive circuit in which AC power is rectified into a DC output. Background technique [0002] As we all know, the by-product of rectifying AC power to DC power is the harmonics generated on the transformer and the harmonics are fed back to the AC power through the power grid. These harmonics are undesirable because, at a given voltage and power, they increase the circulating current, and therefore increase power consumption and cause distortion of the voltage, which also supplies power to other loads. The additional harmonics will cause more circulating currents, which are not consumed by the load. The AC power supply still has to generate this part of the electric energy even when it does not supply power to the load. The additional current also means that the cable performance needs to be improved to cope with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M1/12
CPCH02M1/12H02M7/49Y10T307/696H02M5/458H02M7/487Y02P80/10H02M1/42H02M5/10H02M5/453H02P27/06
Inventor 弗兰克·韦纳·黑特
Owner NIDEC CONTROL TECHN LTD