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A method and device for adaptively adjusting charging power

A technology of self-adaptive adjustment and charging power, applied in the direction of circuit devices, battery circuit devices, collectors, etc., can solve problems such as large voltage drop of access voltage, affecting normal use of electrical equipment, and failure to work normally

Active Publication Date: 2018-09-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the charging devices on the market are generally of constant power and high power. For places with harsh electricity environments such as mountainous areas, the load current may be too large, resulting in a large drop in the access voltage, which may cause it to fail to work normally and Affect the normal use of other electrical equipment

Method used

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  • A method and device for adaptively adjusting charging power
  • A method and device for adaptively adjusting charging power
  • A method and device for adaptively adjusting charging power

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 As shown, it includes pre-charging circuit, three-phase three-switch three-level rectifier VIENNA rectifier, LLC resonant circuit, low-pass low-frequency filter circuit, terminal voltage detection circuit, proportional integral differential regulator namely PID regulator, power / current control and charging circuit.

[0026] The charging circuit is composed of a relay, a capacitor, a diode, an inductor, a sampling resistor I, a sampling resistor II, and a logic control circuit; the output terminal of the pre-charging circuit is connected to a diode for preventing backflow, and then connected to an inductor for filtering and a parallel capacitor , and finally connected to the output relay, and two sampling resistors are connected between the output terminal of the output relay and the ground to feed back the output voltage; the control method adopts the control method of constant current first and then constant voltage.

[0027] The power line of the VIENNA ...

Embodiment 2

[0040] Through MATLAB / Simulink for modeling and simulation, the charging model without the function of self-adaptive adjustment of charging power and the charging model of the present invention with the function of self-adaptive adjustment of charging power are respectively established in the case of relatively harsh power consumption conditions.

[0041] The charging model without the function of adaptively adjusting the charging power is as follows: image 3 As shown, the resistance of the line can be obtained by its definition, and the charging power of this charging device is approximately linearly increased.

[0042] Through the simulation results, the waveform of the grid voltage and the curve of the effective value of the grid voltage can be obtained, see Figure 4 with Figure 5 . It can be seen from this that after loading, the grid voltage drops very quickly to 180v, which seriously affects the normal operation of the charging device and other electrical equipment....

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Abstract

The invention provides a method and device for adaptively adjusting charging power. The device comprises a pre-charging circuit, a VIENNA rectifier, an LLC resonance circuit, a low-frequency filter circuit, a terminal voltage detection circuit, a PID adjuster, a power / current controller and a charging circuit. The adaptive charging method comprises: employing the terminal voltage detection circuit to measure the voltage U1 of a power grid before loading of a charging device and the voltage U2 of the power grid after loading of the charging device; calculating the voltage drop and the line loss of the power grid; judging whether the voltage drop value of the power grid reaches 10% of the nominal voltage of the power grid and whether the line loss power reaches 10% of the charging power; and adjusting the charging power via the PID adjuster. If the voltage drop value of the power grid is greater than 10% or the line loss power is greater than 10%, the charging power is reduced. If the voltage drop value of the power grid is less than 10% or the line loss power is less than 10%, then the charging power is increased until a full-load state is reached. The adaptive charging method and device of the invention are adaptive to charging devices in various charging environments, and therefore are relatively reliable, safe and effective.

Description

technical field [0001] The technical field of electric vehicle charging of the present invention relates to charging for electric vehicles, in particular to a method for adaptively adjusting charging power and a charging device. Background technique [0002] With the development of electric vehicles, electric vehicle charging devices are more and more widely used in various occasions. At present, the charging devices on the market are generally of constant power and high power. For places with harsh electricity environments such as mountainous areas, the load current may be too large, resulting in a large drop in the access voltage, which may cause it to fail to work normally and Affect the normal use of other electrical equipment. Contents of the invention [0003] The purpose of the present invention is to provide a high-efficiency, intelligent method and charging device for self-adapting charging power adjustment. [0004] The charging device for adaptively adjusting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/04
CPCH02J7/00H02J7/02
Inventor 刘和平程章格金烨璇陈金罗何佳璐余传祥邓力郑群英
Owner CHONGQING UNIV