Integrated multi-mode power converter for electric automobile and control method of integrated multi-mode power converter

A technology for power converters and electric vehicles, applied to output power conversion devices, converting DC power input to DC power output, and converting AC power input to AC power output, etc., can solve problems such as reducing efficiency and increasing losses, and achieve Effect of improving charging efficiency

Pending Publication Date: 2019-04-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a scheme of sharing the power switch tube of the motor controller for DC / AC conversion for high-power charging (such as BYD's patent No. 201210591834.5), but when the output voltage of the motor is low, the scheme also needs to pass through DC / AC. After the DC boost is converted by the motor controller module, the loss is increased
In addition, when the solution is charged with high power, it needs to go through a three-phase inverter circuit and a DC / DC module circuit, which reduces the efficiency.

Method used

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  • Integrated multi-mode power converter for electric automobile and control method of integrated multi-mode power converter
  • Integrated multi-mode power converter for electric automobile and control method of integrated multi-mode power converter
  • Integrated multi-mode power converter for electric automobile and control method of integrated multi-mode power converter

Examples

Experimental program
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Effect test

Embodiment 1

[0033] like figure 1 Shown is the schematic circuit diagram of Example 1, which is an integrated multi-mode power converter for electric vehicles, and the energy source is the charging and discharging storage energy of lithium battery or lead-acid battery.

[0034] The integrated multi-mode power converter converts AC input power into DC power to charge the energy source, and inverts the DC power of the energy source into AC output. The integrated multi-mode power converter includes a single-phase AC path, a three-phase AC path and a DC path.

[0035] The emitter of the power switching device IGBT91 is connected to the collector of IGBT94 to form a group of bridge arms. The collector terminal of IGBT91 is the high end of the bridge arm, and the connection between the emitter of IGBT91 and the collector of IGBT94 is the midpoint of the bridge arm; the emitter of IGBT92 The pole is connected to the collector of IGBT93 to form another group of bridge arms. The collector terminal...

Embodiment 2

[0069] In this embodiment, the energy source 15 connected to the DC terminal interface 14 is selected as a fuel cell; compared with other energies, the fuel cell has the advantages of no pollution, high efficiency, and recyclability. The fuel cell does not need to be charged, and only needs to be supplemented with fuel. , so the DC terminal only has a one-way DC / DC function.

[0070] When the system works in the one-way conversion mode of DC terminal-DC bus (DC-DC), the controller (ECU) 4 controls IGBT93 and IGBT94 to work in PWM mode through signals, and IGBT91 and IGBT92 provide current paths or work through anti-parallel diodes. In the synchronous rectification mode, the unidirectional boost (Boost) function is realized.

[0071] Other basic working principles are basically the same as Example 1, and the circuit schematic diagram refers to Example 1, so I won’t go into details here

Embodiment 3

[0073] like Figure 8 As shown, it is the circuit schematic diagram of the embodiment. When the parameters such as the voltage level, current, switching frequency, and ripple rate of the designed grid three-phase AC path and the motor three-phase AC path are similar, the grid three-phase AC inductance value and the motor three-phase AC path are similar. The three-phase AC inductance values ​​are also similar. By adjusting the design parameters, the three-phase AC path of the power grid and the three-phase AC path of the motor can share the first three-phase AC terminal inductance 53, the second three-phase AC terminal inductance 54, and the third three-phase AC terminal. Inductor 55, thereby further saving system space and cost.

[0074] In the three-phase AC path of this implementation example, the charging and discharging socket 8 is sequentially connected to a single-phase AC electromagnetic interference filter EMI2, a six-connector three-phase DC motor 18, and connected to a...

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Abstract

The invention discloses an integrated multi-mode power converter for an electric automobile and a control method of the integrated multi-mode power converter. The integrated multi-mode power converterfor the electric automobile comprises a single phase alternating current connector, a single-pole double-throw switch, a charging and discharging socket, a single phase alternating current electromagnetic interference filter (EMI), a direct current terminal connector, a direct current bus switch, power switch elements, alternating current inductance, a controller, a filter capacitor, a three-phase alternating current electromagnetic interference filter (EMI), a three-phase alternating current motor, a current sensor and a voltage sensor, and a plurality conversion modes of bidirectional conversion of direct current-direct current, bidirectional conversion of single phase alternating current-direct current, the bidirectional conversion of direct current-motor three-phase alternating current, the bidirectional conversion of direct current-power grid three-phase alternating current and the bidirectional conversion of single phase alternating current-three-phase alternating current underhigh voltage requirement or low voltage requirement can be realized. Parts of elements are used by the modes, space can be saved, the control efficiency is improved, the number of the power switch elements and the number of radiators matched with the power switch elements are reduced, and the integrated multi-mode power converter for the electric automobile has smaller volume, lighter weight and lower cost.

Description

technical field [0001] The invention relates to a power conversion system, in particular to an integrated multi-mode power converter for an electric vehicle and a control method thereof. Background technique [0002] As a low-carbon and environmentally friendly means of transportation, electric vehicles represent the direction of future automobile development and have developed rapidly in recent years. For electric vehicles, based on the limitations of their space layout and power density requirements, it is usually necessary to integrate systems with different functions. Power density and vehicle performance requirements. In order to improve the performance of the electric vehicle power supply system, lithium batteries or fuel cells are usually used as energy sources. In order to meet the load power and energy requirements, a DC / DC converter needs to be used for DC power conversion to achieve voltage matching; at the same time, in order to power the battery Efficient and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M3/158
CPCH02M5/4585H02M3/1584
Inventor 罗玉涛
Owner SOUTH CHINA UNIV OF TECH
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