Adaptive hysteresis sliding-mode control method for double-tube Buck-Boost converter

A control method and converter technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as excessive power loss, electromagnetic interference, and switching frequency instability, and avoid design Sophisticated, well tuned and dynamic performance, enhanced stability and robustness effects

Active Publication Date: 2016-11-16
威海天力电源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the sliding mode control has the above advantages, the main problem in its application is the characterist

Method used

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  • Adaptive hysteresis sliding-mode control method for double-tube Buck-Boost converter
  • Adaptive hysteresis sliding-mode control method for double-tube Buck-Boost converter
  • Adaptive hysteresis sliding-mode control method for double-tube Buck-Boost converter

Examples

Experimental program
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Example Embodiment

[0017] Specific implementation mode 1: the following combination figure 1 Explain the process of establishing the mathematical model of the dual-tube Buck-Boost converter. The dual-tube Buck-Boost converter is obtained by cascading and simplifying the Buck converter and the Boost converter. According to the comparison between the input voltage and the ideal output voltage, the converter can work in Buck mode and Boost mode.

[0018] (1) When the input voltage is higher than the output voltage, the controllable switch Q 2 Keep off, diode D 2 Turn on, control the controllable switch Q 1 To adjust the output voltage, the converter is equivalent to a Buck converter, and the mathematical model of the converter in Buck mode satisfies:

[0019] (1)

[0020] Wherein, L is the filter inductance, C is the filter capacitor, R is the load resistance, v in Is the instantaneous value of the input voltage, v c Is the instantaneous value of output voltage, i L Is the instantaneous value of the in...

Example Embodiment

[0026] Specific implementation manner 2: According to i in the mathematical model L And v c , Construct the control trajectory function S, so that S satisfies:

[0027] (4)

[0028] Where the I L Is the DC component of the inductor current, α is the positive control coefficient, which is called the sliding coefficient, V ref Is the reference output voltage, β is the proportional coefficient of the output voltage sampling circuit, and satisfies V ref =β×V o , V o Is the ideal output voltage value.

[0029] In the actual circuit, let the sampled inductor current i L After a high-pass filter, i is equivalently obtained L −I L .

Example Embodiment

[0030] Specific implementation mode 3: The entire sliding mode movement can be divided into two stages, the first stage (called the arrival stage), regardless of the initial position of the control trajectory S, the sliding mode control will force the trajectory to move to the sliding manifold. This process needs to meet the arrival conditions to be realized.

[0031] The reaching condition requires the trajectory of the selected control decision guidance system to approach and finally reach the sliding manifold, that is, satisfy:

[0032] (5)

[0033] (1) When S> At 0, by formula (5), it needs to satisfy , By formula (4), it needs to satisfy:

[0034] (6)

[0035] When the converter is in Buck mode, it needs to meet , Controllable switch tube Q 1 Control signal u 1 =0; when the converter is in Boost mode, it needs to meet , Controllable switch tube Q 2 Control signal u 2 =1.

[0036] (2) When S , By formula (4), it needs to satisfy:

[0037] (7)

[0038] When the converter is i...

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Abstract

The invention discloses an adaptive hysteresis sliding-mode control method for a double-tube Buck-Boost converter. Aiming at the characteristic that the double-tube Buck-Boost converter has a right-half-plane zero point, a hysteresis current controller is adopted and the controlled quantity switching frequency is not over-high due to addition of hysteresis; aiming at the characteristic that the converter is relatively wide in input range, an adaptive feedforward is introduced, the hysteresis width is changed according to a change of input voltage and the switching frequency changes within a relatively small range when the input voltage changes; and aiming at the characteristic that the steady state switching frequency is affected by a load change, an adaptive feedback is introduced, a sliding coefficient is adjusted according to the load change and the switching frequency remains unchanged in the load change. Design and implementation of the controller are relatively simple; the response speed is relatively high; and the controller has relatively high stability and robustness, and can be applied to the occasions of a wide-range change of input voltage and a relatively large load change.

Description

technical field [0001] The invention relates to an adaptive hysteresis loop sliding mode control method for a double-tube Buck-Boost converter, belonging to the technical field of power electronics. Background technique [0002] With the development of power electronics technology, power electronic converters have been more and more widely used. In wind and solar power generation, underground mine power supply, communication power supply, and military special vehicle power supply, etc., power electronic converters are required to convert a wide range of DC input voltage into a constant DC voltage output. In these occasions, due to the advantages of the same input and output voltage polarity, less passive components, and low voltage stress of the switch tube, the dual-tube Buck-Boost converter has been widely used. [0003] The PWM control method is a commonly used control method for the dual-tube Buck-Boost converter. However, this control method uses a small-signal model,...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/1582
Inventor 孟凡刚王琳高蕾
Owner 威海天力电源科技有限公司
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