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Power electronic device

A technology of power electronics and equipment, applied in the field of power electronics equipment, can solve problems such as increasing the cost of power electronics equipment

Active Publication Date: 2020-01-10
DANFOSS POWER ELECTRONICS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This increases the cost of the power electronics

Method used

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  • Power electronic device

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Embodiment Construction

[0020] The power electronics in the form of a frequency converter 1 comprises a grid side L1 , L2 , L3 connected to a capacitor bank 2 . The capacitor bank 2 is connected to ground 3 via a switch 4 . A capacitor bank consists of an arrangement of star-connected capacitors, more precisely the capacitance between each phase and the midpoint. Switch 4 is connected between the midpoint and ground 3 . Each capacitance may be formed by a single capacitor, or by a series or parallel connection of two or more capacitors.

[0021] The varistor 5 is connected in parallel with the switch 4 . The varistor 5 is preferably in the form of a metal oxide varistor.

[0022] The varistor 5 is an electronic component whose resistance changes with the applied voltage. At low voltage it has a high resistance which decreases as the voltage increases.

[0023] Therefore, when a common mode surge voltage occurs, the varistor 5 becomes conductive.

[0024] The varistor 5 is dimensioned such that ...

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Abstract

A power electronic device is described. The power electronic device comprises a grid side (L1, L2, L3) connected to a capacitor bank (2) , and the capacitor bank (2) is connected to ground via a switch. Such power electronic device should be used in different types of grid with low costs. To this end a varistor (5) is connected in parallel to the switch.

Description

technical field [0001] The invention relates to a power electronics device comprising a grid side connected to a capacitor bank which is grounded via a switch. Background technique [0002] The power electronics may be in the form of frequency converters, for example. A frequency converter includes a rectifier stage, a DC link and an inverter stage. [0003] In any case, such power electronics should be protected from grid surges. For this purpose, it is known to use varistors as surge suppressors. As a minimum, protection against differential mode surge voltages is necessary for the robustness of power electronics, ie against phase-to-phase surge voltages. Additional protection against common mode surge voltages is required, ie against surge voltages between phases and ground. [0004] It should be possible to use power electronics in different types of grids. One type of grid is a star-connected grid and the other is a delta-connected grid. Other types of grids are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02J3/38
CPCH02H9/04H02J3/38H02M1/32H02M5/458H02M5/4585
Inventor 卡斯滕·R·汉森亨宁·马库斯·莫滕森
Owner DANFOSS POWER ELECTRONICS AS
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