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Power converter for electric vehicle

A technology of power converters and electric vehicles, which is applied in the direction of output power conversion devices, motor control, AC motor control, etc., and can solve problems such as large heat generation

Active Publication Date: 2020-03-31
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Switching elements for power conversion generate large amounts of heat because they handle large amounts of power

Method used

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  • Power converter for electric vehicle
  • Power converter for electric vehicle
  • Power converter for electric vehicle

Examples

Experimental program
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Embodiment Construction

[0018] The power converter 2 of the embodiment will be described with reference to the drawings. Power converter 2 is mounted on electric vehicle 100 . exist figure 1 A block diagram of the power system of the electric vehicle 100 including the power converter 2 is shown in . Electric vehicle 100 has two electric motors 91a, 91b for driving the vehicle.

[0019] The electric vehicle 100 includes a DC power supply 13 , a power converter 2 , and a main controller 25 in addition to the two electric motors 91 a and 91 b. The DC power supply 13 is a lithium ion battery. The power converter 2 converts the output power of the DC power supply 13 into driving power for the motors 91a and 91b. The motors 91a and 91b are three-phase AC motors. The power converter 2 boosts the output voltage of the DC power supply 13 and converts the boosted power into three-phase AC.

[0020] The power converter 2 includes a voltage converter 11 , an inverter 12 , a cooler 20 , and a controller 6 ....

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PUM

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Abstract

A technique for providing thermal protection of a current sensor in a power converter used in an electric vehicle that utilizes a driving electromotor to supply powder is provided. The power converteris provided with a switching element, a current sensor, a cooler and a controller. The switching element converts output of a battery to driving power of a driving electromotor. The current sensor ismounted on a bus bar in which an output current of the switching element flows, and measuring output current. The cooler cools the switching element. The controller determines an estimated temperature of the current sensor based on the temperature of a refrigerant. The controller determines first and second correction values for the estimated temperature based on the output current and an input voltage applied to the switching element. The controller restricts a load on the switching element when a corrected temperature, which is obtained by adding the first and second correction values to the estimated temperature, exceeds a predetermined temperature threshold.

Description

technical field [0001] The technology disclosed in this specification relates to a power converter that converts output power of a power supply into driving power of a running motor. Background technique [0002] An electric vehicle includes a power converter that converts output power from a power supply into driving power for a running motor. In addition, the electric vehicle in this specification includes a hybrid vehicle including both an electric motor for running and an engine, and an automobile including a fuel cell as a power source for the electric motor for running. A typical power converter is an inverter that converts DC power to AC power. A power converter sometimes includes a step-up converter that boosts the voltage of DC power in the first stage of the converter (for example, JP-A-2013-48515). Hereinafter, the running electric motor will be simply referred to as an electric motor. [0003] A power converter includes many switching elements for power conver...

Claims

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Application Information

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IPC IPC(8): H02P5/46H02P27/06H05K7/20
CPCH02P5/46H02P27/06H05K7/20927H05K7/20945H02M3/158H02M1/08H02M7/003H02M7/5387H02P29/68H02M1/0009H02M1/008H02M1/007H02M1/327H02M3/003H02M1/32H02M3/156
Inventor 前田英树
Owner DENSO CORP
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