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Electronic intermediate DC circuit

A DC intermediate circuit, electronic technology, applied in the direction of AC motor control, high-efficiency power electronic conversion, electrical components, etc.

Inactive Publication Date: 2008-10-08
VORWERK & CO INTERHOLDING GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the instantaneous value of the supplied mains sinusoidal voltage now rises above this voltage level again, the capacitor starts to recharge, which leads to a non-sinusoidal current jump in the energy supply network

Method used

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  • Electronic intermediate DC circuit

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Embodiment Construction

[0008] The circuit is configured to supply an electric motor 1 (here polyphase) from an energy supply network 2 into which a DC intermediate circuit 3 is inserted.

[0009] A rectifier bridge 5 consisting of diodes 4 serves as the initial stage for the sinusoidal voltage of the mains supply. The two capacitors 6 and 7 connected in parallel are provided by the two-way bridge rectifier. Capacitor 6 is a film capacitor with a low capacitance of a few microfarads. An electrolytic capacitor is provided as the second capacitor 7 . Capacitor 7 has a significantly higher capacitance than capacitor 6 . It is several microfarads, such as 500 μF.

[0010] The two capacitors 6 and 7 are connected to each other via a blocking diode 8 in such a way that, seen from the supply side, only the film capacitor 6, which forms the input capacitor, is active, the capacitor 6 has a small capacitance, and the harmonic From the point of view of wave standards, this capacitance is not critical. The...

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PUM

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Abstract

The invention relates to an electronic intermediate DC circuit which is to be used in brushless electric motors (1) such as reluctance motors and comprises a rectifier bridge (5) composed of diodes (4) and a capacitor that is connected downstream from the rectifier bridge (5). In order to improve the design of a circuit of said type in a structurally simple manner, two capacitors (6, 7) which have different capacities are connected downstream from the rectifier bridge (5).

Description

technical field [0001] The invention relates to an electronic DC intermediate circuit for use with a brushless motor, such as a reluctance motor, comprising a rectifier bridge consisting of diodes and a capacitor connected downstream of the rectifier bridge. Background technique [0002] In the case of brushless motors such as reluctance motors (which are further used in household appliances such as household vacuum cleaners), the power supply is influenced by a DC intermediate circuit. A passive DC bridge is used as the initial stage of the mains sine wave voltage, which charges the electrolytic capacitor bank to the peak value of the input voltage. This intermediate circuit can act as an energy store from which the electric motor draws energy via the rectifier and to which the electric motor can also return its freewheel energy. Harmonics in the energy supply network caused by reverse charging of the intermediate circuit are damped, as far as the characteristics of the va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/08H02M1/00
CPCH02P25/08H02M1/4208H02P25/04Y02B70/126Y02B70/10
Inventor 冈特·波彭尤维·考尔德维托斯滕·兰
Owner VORWERK & CO INTERHOLDING GMBH