Isolated bidirectional charger control method and control circuit

A control circuit, isolated technology, applied in battery circuit devices, circuit devices, AC network circuits, etc., can solve the problems of difficult to achieve regulation, inability to achieve boost function, insufficient voltage gain, etc.

Inactive Publication Date: 2018-12-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS WUXI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under pulse frequency modulation, the voltage gain of the LC series circuit is equal to or less than 1, and it can only step down, but cannot realize the boost function. The traditional LLC converter has the problem of insufficient voltage gain when it operates in reverse, and it is difficult to achieve the goal of regulation.

Method used

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  • Isolated bidirectional charger control method and control circuit
  • Isolated bidirectional charger control method and control circuit
  • Isolated bidirectional charger control method and control circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Embodiment 1: The control circuit of the isolated bidirectional charger of the present invention:

[0067] like figure 1 , Image 6 As shown, the bidirectional charger control circuit of the present invention includes a bidirectional AC / DC converter, an isolated DC / DC converter and a control unit; the grid is connected to the battery through the bidirectional AC / DC converter and the isolated DC / DC converter in turn group, the isolated DC / DC converter adopts LLC converter, and the control unit includes sampling circuit, DSP and optocoupler isolation driving circuit.

[0068] The bidirectional AC / DC converter includes a first switching tube Q 1 , the second switching tube Q 2 , the third switching tube Q 3 , the fourth switching tube Q 4 ; The fifth switching tube Q 5 , the sixth switching tube Q 6 . Switch tube Q 1 with Q 2 connected in series to form the first bridge arm, the switching tube Q 3 with Q 4 connected in series to form the second bridge arm, the ...

Embodiment 2

[0077] Embodiment 2: The control method of the isolated bidirectional charger of the present invention:

[0078] The present invention is based on the isolated bidirectional charger control method of Embodiment 1:

[0079] When charging the battery, the charging process is completed by a bidirectional AC / DC converter and an LLC converter. The bidirectional AC / DC converter uses the pulse width modulation (PWM) method to control the bus voltage v bus , The LLC converter adopts the pulse frequency modulation method (PFM) to connect to the car battery for charging.

[0080] When the battery is discharged, the isolated DC / DC converter is an inverse LLC converter, which always works near the best efficiency point, and the bus voltage v bus The output is inverted by a bidirectional AC / DC converter. The inverter output can be connected to the large power grid to provide peak-shaving and valley-filling functions, and it can also be operated in an isolated island to realize home powe...

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Abstract

The invention discloses a control method and a control circuit of an isolated bidirectional charger, belonging to the technical field of power electronic converters. The bi-directional charger controlcircuit adopted by the method comprises a bi-directional AC/DC converter, an isolated DC/DC converter and a control unit. The power grid is connected to the battery pack through bi-directional AC/DCconverter, isolated DC/DC converter, isolated DC/DC converter using LLC converter, control unit including sampling circuit, DSP and optocoupler isolated driving circuit. The control method realizes the high efficiency of bi-directional operation and forward and backward operation of the vehicle-mounted charger, and has the advantages of high power density, high reliability, few devices and high efficiency.

Description

Technical field [0001] The invention discloses an isolated bidirectional charger control method and belongs to the technical field of power electronic converters. Background technique [0002] Electric vehicles are an important breakthrough in solving the energy crisis in today's society. Global electric vehicle sales exceeded 1.2 million in 2017, and the charging efficiency of electric vehicles has received widespread attention. The two-stage vehicle charger topology is the most commonly used solution in the industry. The front stage is BoostPFC with a power frequency diode rectifier bridge. It uses the Boost boost principle to rectify the AC input voltage and uniformly increase it to about 400V, which is suitable for wide AC voltages. Input occasion (85-275V, 45-70Hz). The rear stage is a full-bridge LLC resonant converter, which can achieve soft switching within the full load range and achieve extremely high charging efficiency. Moreover, the inductor in the LLC convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/10H02J3/38H02J3/32
CPCH02J2007/10H02J3/32H02J3/381H02J7/06
Inventor 张之梁李浩然任小永李建飞陈乾宏朱靖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS WUXI RES INST
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