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Integrated multifunctional power source switching system

A power conversion system and multi-functional technology, applied in the direction of output power conversion device, control/regulation system, DC power input conversion to DC power output, etc., can solve the problems of occupying valuable space, increasing the weight and cost of electric vehicles, etc. Achieve the effect of saving system cost, light weight and reducing system volume

Inactive Publication Date: 2016-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in order to realize these three functions, a bidirectional DC / DC converter, an AC / DC charger, and a DC / AC inverter need to be equipped, which takes up valuable space in the car and increases the weight and cost of the electric car.

Method used

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  • Integrated multifunctional power source switching system
  • Integrated multifunctional power source switching system
  • Integrated multifunctional power source switching system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The integrated multifunctional power conversion system is applied to the composite power system composed of battery packs and super capacitors. The integrated multifunctional power conversion system performs DC power conversion between the super capacitor and the battery pack, and converts AC input power into DC power. Charging the battery pack, inverting the DC power of the battery pack into AC output.

[0039] Such as figure 1 As shown, the integrated multifunctional power conversion system includes an AC interface 1, a transformer 2, an EMI filter 3, a first AC-side inductor 51, a second AC-side inductor 52, an AC-side switch 6, and a first DC-side filter capacitor 16 , The first DC terminal interface 17, the super capacitor group 18, the DC terminal switch 15, the first DC terminal inductor 53, the second DC terminal inductor 54, the second DC terminal interface 10, the battery pack 11, the motor controller 12, Three-phase motor 13, second DC terminal filter capacitor ...

Embodiment 2

[0054] The inductance value is determined by the following formula:

[0055] L = V i n X D I L X r X f

[0056] In the formula, L is the inductance value, V in Is the input voltage, D is the duty cycle, I L Is the inductor current, r is the current ripple rate, and f is the switching frequency.

[0057] When the voltage level, current, switching frequency, ripple rate and other parameters of the designed AC path and DC path are similar, the AC-side inductance value and the DC-side inductance value are also similar. By adjusting the design parameters, the first AC-side inductance 51, The two AC-side inductors 52 can be replaced by the first DC-side inductor 53 and the second DC-side inductor 54, such as Figure 5 As shown, thereby further saving system space and cost.

[0058] In the AC path of this embodiment, the AC interface 1 is connected to the first DC-side inductor 53 and the first DC-side inductor 54 after passing through the transfor...

Embodiment 3

[0062] When the peak input AC voltage is (V acL Is the lowest value of the effective value of AC voltage, V acH Is the highest value of AC voltage effective value), the second DC terminal voltage range is V dcL ~V dcH (V dcL Is the lowest voltage of the second DC terminal, V dcH Is the highest voltage of the second DC terminal), and satisfies When the AC-side transformer is not required, the AC interface 1 is directly connected to the EMI filter 3. Such as Image 6 As shown, compared with the implementation example 2, since the voltage level of the AC interface 1 and the voltage level of the second DC terminal 10 meet the above requirements, the AC terminal transformer may not be used, and both ends of the AC interface 1 are directly connected to the EMI filter 3 Both ends are connected, and the connection method of other devices is the same as that of embodiment 2. When the system works in the bidirectional DC / DC mode, the AC side switch 6 is opened, and the DC side s...

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Abstract

The invention discloses an integrated multifunctional power source switching system. An alternating-current interface of the integrated multifunctional power source switching system is connected with an alternating-current end switch through an EMI filter, passes through the alternating-current end switch, a first direct-current end inductor and a second direct-current end inductor and is connected with bridge arm middle points formed by a first power switch device, a second power switch device, a third power switch device and a fourth power switch device respectively; the positive electrode and the negative electrode of a first direct-current end interface are connected with the positive electrode and the negative electrode of a first direct-current end filter capacitor respectively, the positive electrode of the first direct-current end filter capacitor passes through a direct-current end switch and then is divided into two paths, and the two paths pass through the first direct-current end inductor and the second direct-current end inductor and then are connected to bridge arm middle points formed by the first power switch device, the second power switch device, the third power switch device and the fourth power switch device respectively. The switching system is used for mutual switching between alternating currents and direct currents of an electric automobile power source system, and two-way direct current-direct current switching, single-phase alternating current-direct current switching and direct current-single-phase alternating current switching between power sources are achieved.

Description

Technical field [0001] The invention relates to a power conversion system, in particular to an integrated multifunctional power conversion system, in particular to an electric vehicle power supply DC / DC, AC / DC, and DC / AC conversion system. technical background [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. In order to improve the performance of the electric vehicle power system, lithium batteries or fuel cells are usually used as the main power source, combined with super capacitor banks or batteries as auxiliary power sources to form a composite power structure to meet the power and energy requirements of the power system. The main power supply and the auxiliary power supply usually have different voltage levels, and a bidirectional DC / DC converter is required for bidirectional DC power conversion to achieve voltage matching; at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M7/797
CPCH02M3/1563H02M7/797
Inventor 罗玉涛王峰
Owner SOUTH CHINA UNIV OF TECH
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