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System and method for variable DC bus voltage coupled to inverters

A bus voltage and inverter technology, applied in the field of variable DC bus voltage, can solve the problems of increasing thermal stress and reducing lifespan

Pending Publication Date: 2020-12-15
DEERE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the DC bus voltage level is designed to be higher than required, the capacitors coupled to the DC bus and the switches of the inverter may experience increased thermal stress; thus, reduced lifetime

Method used

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  • System and method for variable DC bus voltage coupled to inverters
  • System and method for variable DC bus voltage coupled to inverters
  • System and method for variable DC bus voltage coupled to inverters

Examples

Experimental program
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Embodiment Construction

[0015] figure 1 is a block diagram of one embodiment of a system 11 for a variable direct current (DC) bus voltage coupled to an inverter. exist figure 1 In , a first electric machine 12 is coupled to a first inverter 14 powered by a variable DC bus (eg, observable at DC bus terminal 30 ). The second electric machine 112 is coupled to a second inverter 114 powered by a variable DC bus. In one embodiment, a voltage regulator 34 is coupled to the DC bus terminal 30 . Voltage regulator 34 is configured to be based on command estimator 36 (e.g., V DC voltage command estimator) to adjust the voltage level of the variable DC bus.

[0016] According to one embodiment, the method and system 11 is configured to control a first inverter 14 and a second inverter 114 coupled to a variable DC voltage bus or DC bus terminal 30 . The inverter inputs of the first inverter 14 and the second inverter 114 are coupled to a variable direct current (DC) voltage bus at DC bus terminal 30, and t...

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PUM

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Abstract

A voltage command estimator is configured to estimate a minimum required variable DC bus voltage based on the first direct-axis current / voltage command, the first quadrature-axis current / voltage command, the second direct-axis current / voltage command, and the second quadrature-axis current / voltage command for a respective time interval. The voltage command estimator is configured to provide the estimated minimum required variable DC bus voltage to a voltage regulator to adjust the observed voltage level of the variable DC voltage bus to the estimated minimum required variable DC bus voltage tomaintain the operation, as commanded by the voltage / current commands, of the first electric machine under the first variable load and the second electric machine under the second variable load at thetime interval.

Description

technical field [0001] The present disclosure relates to a system and method for a variable direct current (DC) bus voltage coupled to an inverter. [0002] related application [0003] This application claims the benefit of the filing date and priority of U.S. Provisional Application Serial No. 62 / 861,792, filed June 14, 2019, which is hereby incorporated by reference in its entirety. Background technique [0004] In some prior art vehicle systems, the DC bus voltage is fixed at a voltage level that determines the available alternating current (AC) output of an inverter to supply an electric motor or other load. If the DC bus voltage level is designed to be higher than required, the capacitors coupled to the DC bus and the switches of the inverter may experience increased thermal stress; thus, reduced lifetime. Accordingly, there is a need for a system and method for a variable DC bus voltage coupled to an inverter, where the system and method are well suited for reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/493H02P5/74H02P21/00H02P27/06
CPCH02P5/74H02P21/14H02M1/143H02M7/4826H02M7/493H02M1/0043H02M7/48H02P21/0003H02P27/06H02P21/0025H02P6/28H02M1/0006H02M1/008
Inventor 李丹吴隆朱光启
Owner DEERE & CO