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Adaptive hysteresis-loop sliding mode control method for dual-tube buck-boost converter

A control method and converter technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as unstable switching frequency, excessive power loss and electromagnetic interference, and achieve good regulation performance and dynamic performance, avoid design complexity, enhance stability and robustness effects

Active Publication Date: 2019-04-19
威海天力电源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sliding mode control has the above advantages, the main problem in its application is the characteristic that the switching frequency is not fixed, which will cause excessive power loss and electromagnetic interference

Method used

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  • Adaptive hysteresis-loop sliding mode control method for dual-tube buck-boost converter
  • Adaptive hysteresis-loop sliding mode control method for dual-tube buck-boost converter
  • Adaptive hysteresis-loop sliding mode control method for dual-tube buck-boost converter

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specific Embodiment approach 1

[0024] Specific implementation mode one: the following combination figure 1 Explain the establishment process of 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 converters can work separately in Buck mode and Boost mode.

[0025] (1) When the input voltage is higher than the output voltage, the controllable switch Q 2 kept open, the diode D 2 conduction, 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:

[0026]

[0027] Wherein, the 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, when u 1 = 1, the converter is in the stage of inductiv...

specific Embodiment approach 2

[0033] Specific implementation mode two: according to the i in the mathematical model L and v c , construct the control trajectory function S, so that S satisfies:

[0034] S=(i L -I L )-α(V ref -βv c ) (4),

[0035] Among them, the I L is the DC component of the inductor current, α is the positive control coefficient, 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.

[0036] In the actual circuit, let the sampled inductor current i L After a high-pass filter, to equivalently obtain i L -I L .

specific Embodiment approach 3

[0037] Specific embodiment three: the whole sliding mode motion can be divided into two phases, the first phase (referred to as the arrival phase), 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 can only be realized if the arrival condition is met.

[0038] The arrival condition requires that the selected control decision guides the trajectory of the system to approach and eventually reach the sliding manifold, that is, to satisfy:

[0039]

[0040] (1) When S>0, from formula (5), it needs to satisfy According to formula (4), it needs to satisfy:

[0041]

[0042] When the converter is in Buck mode, it needs to satisfy Controllable switch tube Q 1 The control signal u 1 =0; when the converter is in Boost mode, it needs to satisfy Controllable switch tube Q 2 The control signal u 2 =1.

[0043] (2) When S According to formula (4), it needs to satisf...

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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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Patent Type & Authority Patents(China)
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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