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System for actively short-circuiting phases of an inverter and a motor vehicle drive

A drive device and inverter technology, which is applied to power consumption devices, output power conversion devices, electric vehicles, etc., to achieve high functional effects

Active Publication Date: 2019-11-08
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem with these systems is that the drive circuit itself and the power supply to the drive circuit are used to perform a safety-critical function, i.e. active short-circuiting

Method used

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  • System for actively short-circuiting phases of an inverter and a motor vehicle drive
  • System for actively short-circuiting phases of an inverter and a motor vehicle drive
  • System for actively short-circuiting phases of an inverter and a motor vehicle drive

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Embodiment Construction

[0036] exist figure 1 The motor vehicle drive shown in has an inverter 1 and an electric machine 2 , such as in particular a synchronous machine, preferably a PSM. The electric machine 2 is used as a traction drive and is therefore mechanically coupled to the wheels 3 , which can therefore be driven by the electric machine 2 . Electric machine 2 and inverter 1 are designed in three phases, ie they currently have three phases U, V, W. For operation, the electric machine 2 is supplied with electrical energy by the inverter 1 via the phases U, V, W.

[0037] Therefore, the inverter 1 has three phase terminals on the output side. On the input side, the inverter 1 has two direct current terminals for connection to a direct current line DC+ and DC− in each case. The DC lines DC+, DC- are in contact with each pole of the DC power supply 4 . The DC power source 4 can be, for example, a traction battery or a DC generator. The inverter 1 also has a controller, which actuates, ie co...

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Abstract

The invention relates to a system for actively short-circuiting phases (U, V, W) of an inverter (1), wherein the inverter (1) is provided with power semiconductor switches (5, 5A, 5B) for applying an electrical current at the phases (U, V, W), comprising a driver circuit (7) for actuating the power semiconductor switches (5, 5A, 5B), and comprising a protection circuit (9) which permits at least some of the power semiconductor switches (5, 5A, 5B) to be closed for actively short-circuiting the phases (U, V, W). In addition, the protection circuit (9) actuates the power semiconductor switches (5, 5A, 5B) for active short-circuiting in a direct manner, i.e. without detour via the driver circuit (7). The invention further relates to a motor vehicle drive comprising a system of this type.

Description

technical field [0001] The invention relates to a system for actively short-circuiting phases of an inverter. Furthermore, the invention relates to a motor vehicle drive with an inverter for operating an electric machine of the drive, which has such a system for actively short-circuiting the phases of the inverter. Background technique [0002] It is known that inverters have power semiconductor switches, such as MOSFETs or IGBTs, for applying a current with a specific frequency to the phases of the inverter. For this, on the input side, direct current is fed to the inverter. The power semiconductor switches are actuated by a driver circuit, ie respectively switched on (conducting) or switched off (non-conducting). For this purpose, the gate or base terminals of the power semiconductor switches are correspondingly actuated by the driver circuit. The drive circuit is in turn controlled by a controller. The controller determines which of each of the power semiconductor swi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08H02H7/122H02M1/08
CPCB60L3/003H02H7/0838H02H7/1227H02M1/08
Inventor 亚历山大·比尔克曼纽尔·施瓦布
Owner ZF FRIEDRICHSHAFEN AG