Constant frequency second-order sliding mode control system and control method for Buck DC-DC converter
A second-order sliding mode, fixed frequency technology, applied in control/regulation systems, DC power input to DC power output, output power conversion devices, etc. , to achieve the effect of simplified design and good robustness
Active Publication Date: 2018-10-30
CHONGQING UNIV +1
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[0004] However, since the switching frequency depends on the relative magnitude between the input voltage and the output voltage, the second-order sliding mode control operates at a variable frequency when either the input voltage or the output voltage changes, which makes the design of the filter components Difficult and difficult to apply in isolation transformers
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[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0049] The invention establishes a second-order sliding mode control model of the fixed frequency of the Buck DC-DC converter. A finite state machine second-order sliding mode controller is established to analyze the system motion trajectory and the influence of hysteresis parameters on switching frequency. A finite state machine second-order sliding mode controller with hysteresis parameters added is established, and the relationship between hysteresis parameters and switching frequency is analyzed. A second-order sliding mode controll...
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The invention provides a constant frequency second-order sliding mode control system and control method for a Buck DC-DC converter. The control system comprises a voltage input end connected with theinput end of a synchronous Buck DC-DC converter and the input end of a second-order sliding mode controller respectively, wherein the output end of the synchronous Buck DC-DC converter is connected with a voltage output end and the reference voltage signal comparison input end of the second-order sliding mode controller respectively; the switching signal output end of the second-order sliding modecontroller is connected with the signal input end of a frequency converter and the switching signal input end of the synchronous Buck DC-DC converter respectively; the signal output end of the frequency converter is connected with the signal comparison input end of a frequency controller and the reference frequency signal input end is also connected with the signal comparison input end of the frequency controller; and the signal output end of the frequency controller is connected with the frequency control signal receiving end of the second-order sliding mode controller. A hysteresis parameter delta in the second-order sliding mode controller is regulated and controlled in real time through the frequency controller, so that the technical field of frequency stabilization is achieved.
Description
technical field [0001] The invention relates to the field of automation control, in particular to a second-order sliding mode control system and control method for a fixed frequency of a Buck DC-DC converter. Background technique [0002] Most DC-DC converters usually use PWM control, whose switching control signal is determined by a compensator designed using frequency techniques and small-signal averaging models. Once the controller design is based on the small-signal average model, the dynamic performance of the system can only be determined near the equilibrium point, and the existence of the integral term in the compensator will cause the system to respond slowly to disturbances. [0003] It is well known that sliding mode control has better stability and robustness. Sliding mode control can characterize the system under large and small signals, and has a good robust response to uncertainty and disturbance, and is widely used in DC-DC converters. Traditional sliding m...
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Login to View More IPC IPC(8): H02M3/157
CPCH02M3/157H02M1/0016
Inventor 凌睿鲍玲玲邓策亮胡青王殿何欣驰刘姝胡睿冯洋飞
Owner CHONGQING UNIV