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Two-mode control method and system for bidirectional reversible direct-current converter

A technology of a DC converter and a control method, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as difficult stability requirements, switching point oscillation characteristics, and small input voltage range, etc. Achieve the effect of solving output voltage imbalance, smooth transition, and ensuring full stability

Pending Publication Date: 2021-09-07
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

At present, there are three-mode or four-mode control technologies, but there are unstable characteristics such as the oscillation characteristics of the switching point in the "transition zone" and the small input voltage range, which makes it difficult to meet the stability requirements of electric vehicles with a wide range of voltage input

Method used

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  • Two-mode control method and system for bidirectional reversible direct-current converter
  • Two-mode control method and system for bidirectional reversible direct-current converter
  • Two-mode control method and system for bidirectional reversible direct-current converter

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Embodiment 1

[0039] Using the above scheme, based on the Figure 4 The two-mode control system of the bidirectional reversible DC converter shown, where V in is the converter input voltage, V o is the converter output voltage, the load is R, Q 1 ~Q 4 is the switching tube, the switching tube Q 1 and Q 4 The duty cycle is d 1 , 1-d 1 , as a pair of switching tubes with complementary duty ratios; the switching tube Q 2 and Q 3 The duty cycle is d 2 , 1-d 2 , as a pair of switching tubes with complementary duty cycles. By controlling Q 1 ~Q 4 The opening and closing of the inductor L realizes the charging and discharging of the inductor L, and transfers energy to the load R. Specifically, the switching tube Q 1 with Q 3 Turn on, the inductor L stores energy; the switch tube Q 2 with Q 4 Turn on, the inductor L supplies energy to the load R; the switch tube Q 1 with Q 2 turn on, the inductor state depends on the input voltage V in and the output voltage V o size. The spec...

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Abstract

The invention provides a two-mode control method for a bidirectional reversible direct-current converter, which belongs to the conversion technology between direct current and direct current, and controls four paths of PWM signals of a control switch tube in a transition boost mode and a transition buck mode so as to realize that the output voltage is not changed. The duty ratio of the PWM signal is determined by the maximum duty ratio and the control duty ratio, and the maximum duty ratio is adjusted by calculating the output current through a Kalman filtering algorithm. The invention further provides a two-mode control system of the bidirectional reversible direct-current converter. On the basis of switching point estimation of a Kalman filtering algorithm, a nonlinear function of a transition area is linearized, so that when the amplitude of input voltage is close to that of output voltage, and the voltage conversion ratio enters the transition area discontinuously, the nonlinear function of the transition area is linearized, the position of a switching point of the transition area is obtained, and the problem of output voltage offset in a transition region is effectively solved, so that smooth transition between different modes can be realized, and the whole-course stability of the converter under wide-range voltage input is ensured.

Description

technical field [0001] The invention relates to a two-mode control method and system of a bidirectional reversible DC converter, which belongs to the conversion technology between direct current and direct current. Background technique [0002] With the gradual reduction of traditional energy sources, people are gradually developing vehicle technology that uses electric vehicles to use electricity greenly. At present, the battery capacity of electric vehicles is limited, and the driver is prone to the problem of insufficient battery power during driving. Existing electric vehicles are equipped with high-voltage power batteries, whose voltage range is generally distributed between 200-500V, which can charge other electric vehicles. Moreover, during the use of electric vehicles, as the remaining battery power decreases, the power battery voltage will also decrease. Therefore, it is necessary to adopt a buck-boost circuit to realize V2V (Vehicle to Vehicle) energy transfer an...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M3/156
CPCH02M3/158H02M3/156
Inventor 江友华叶怀宇张国旗
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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