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Control unit, inverter, assembly, vehicle and method for controlling inverter

A technology for control units and inverters, which is used in vehicles and used to control inverters, inverters, and components, and can solve problems such as braking torque

Pending Publication Date: 2020-05-01
VALEO EAUTOMOTIVE GERMANY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, disturbance of these functions may cause braking torque

Method used

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  • Control unit, inverter, assembly, vehicle and method for controlling inverter
  • Control unit, inverter, assembly, vehicle and method for controlling inverter

Examples

Experimental program
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Embodiment Construction

[0022] figure 1 is an assembly 1 of a motor 2 , an inverter 3 and a DC voltage source 4 connected to the inverter 3 via a switch 5 . The switch can be controlled by an electronic control unit (ECU) 5 a that is part of the assembly 1 .

[0023] The inverter 3 comprises a DC link capacitor 6 for smoothing the voltage provided by the DC voltage source 4 connected to the input 8 of the inverter 3 . A voltage measurement unit 7 is connected in parallel with the DC link capacitor 6 . Furthermore, the inverter 3 comprises a power unit 9 comprising three half-bridges 10 connected in parallel between the positive potential 11 of the DC link capacitor 6 and the negative potential 12 of the DC link capacitor 6 . Each half-bridge 10 comprises a switching element 13 connected to a positive potential 11 and a switching element 14 connected to a negative potential 12 . Each switching element 13 , 14 comprises a power transistor 15 , such as an insulated gate field effect transistor or an ...

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PUM

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Abstract

A control unit (17) for controlling an inverter (3) with a DC link capacitor (6), with a plurality of output phases (20) and with a plurality of switching elements (13, 14) being arranged in half bridges (10) and being connected to the DC link capacitor (6) and the output phases (20), wherein in a failure mode the control unit is configured to control the switching elements (13, 14) to adopt an active short circuit state, in which the output phases (20) are short-circuited, wherein the control unit is configured to control the switching elements (13, 14) to be transferred from the active shortcircuit state into a freewheeling state, in which the switching elements (13, 14) of one half bridge are turned off, if a first condition, according to which a voltage measuring signal (26) representing a voltage dropping over the DC link capacitor (6) is indicative that the voltage between a positive potential (11) of the DC link capacitor and a negative potential (12) of the DC link capacitor (6) is below a predefined positive voltage threshold, and a second condition, according to which a current measuring signal (28) representing a current (29) flowing between an input (8) of the inverter(3) and the switching elements (13, 14) is indicative that the current (29) in a direction from the positive potential (11) to the negative potential (12) is above or equal to a predefined current threshold being below zero, are fulfilled, and to maintain and / or adopt the active short circuit state, if the first condition is fulfilled and the second condition is not fulfilled.

Description

technical field [0001] The invention relates to a control unit for controlling an inverter having a DC link capacitor, a plurality of output phases and a plurality of switches arranged in a half bridge and connected to the DC link capacitor and the output phases element, wherein in the fault mode, the control unit is configured to control the switching element to adopt an active short-circuit state, wherein the output phase is short-circuited. Furthermore, the invention relates to an inverter, an assembly, a vehicle and a method for controlling an inverter. Background technique [0002] Inverters are known to convert a DC voltage supplied to a DC link into an AC output current that supplies the stator windings of an electric motor. The inverter includes a control unit configured to control switching elements of the inverter such that an alternating output current is generated in a normal operating mode. Due to a fault, the control unit is switched to a fault mode in which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32B60L3/04B60L58/20H02M7/797H02P3/22H02M1/00
CPCB60L3/04H02M1/32H02M7/797H02P3/22B60L2210/10B60L58/20Y02T10/64Y02T10/72Y02T10/70H02M1/0006H02M1/0096
Inventor 卡斯滕·维德曼
Owner VALEO EAUTOMOTIVE GERMANY GMBH