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Hybrid control method of buck-boost convertor

A control method and converter technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problem of difficulty in stable operation, the complexity of Buck-Boost converter control strategy design, Buck-Boost converters cannot work at the same time, etc. problem, to achieve the effect of fast dynamic response, simple algorithm, and high steady-state accuracy

Inactive Publication Date: 2013-07-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In the design of the traditional control strategy, it is necessary to model the two working modes separately. First, it causes the complexity of the control strategy design of the Buck-Boost converter. Second, the Buck-Boost converter cannot work in the two working modes at the same time. (CCM and DCM), that is, it is difficult to work stably in a large load variation range

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  • Hybrid control method of buck-boost convertor
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  • Hybrid control method of buck-boost convertor

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings, but for those skilled in the art, the implementation and protection of the present invention are not limited thereto.

[0025] The Buck-Boost converter is a hybrid dynamic system in which discrete and continuous variables alternate and interact with each other. The hybrid dynamic system is decomposed into a continuous variable dynamic subsystem and a discrete dynamic subsystem. The dynamic characteristics of the continuous variable subsystem evolve with time, and the discrete The dynamic evolution of the event subsystem is driven by events, and the two interact and proceed alternately, showing the migration of discrete positions on the whole, and the gradual evolution of continuous states locally, forming a unified dynamic system.

[0026] According to the conduction of the switch and the diode, the Buck-Boost converter has three working states, q 1 : The switc...

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Abstract

The invention discloses a hybrid control method of a buck-boost convertor. The method comprises the following steps: building a hybrid automata model of the buck-boost convertor; calculating a boundary condition of the hybrid control method, and judging a specific working mode of the buck-boost convertor; and according to a comparison result of a state variable and the boundary condition, outputting a control signal of a switch pipe of a main circuit by a digital signal processor (DSP) and driving the main circuit to operate. By means of the method, a control problem is simplified into a boundary selection problem, an algorithm is simple, the buck-boost convertor is enabled to simultaneously work for a continuous current mode (CCM) and a discontinuous conduction mode (DCM), two kinds of different energy transmission modes are not considered under the CCM, a uniform boundary condition is adopted, steady-state switching frequency cannot change along with jumping of a load, a ripple current of inductance is constant under the CCM, and the hybrid control method has the advantages of being high in dynamic response speed, high in steady-state accuracy, and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a hybrid control method of a Buck-Boost converter. Background technique [0002] On the one hand, the use of the main switching device in the Buck-Boost converter makes the circuit topology of the Buck-Boost converter no longer fixed, but changes with the change of the switch state; on the other hand, the Buck-Boost converter has two There are two working modes: inductor current continuous mode (CCM) and inductor current discontinuous mode (DCM). In the design of the traditional control strategy, it is necessary to model the two working modes separately. First, it causes the complexity of the control strategy design of the Buck-Boost converter. Second, the Buck-Boost converter cannot work in the two working modes at the same time. (CCM and DCM), that is, it is difficult to work stably within a large load variation range. [0003] In essence, the Buck-Boost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
Inventor 王学梅余泉张波
Owner SOUTH CHINA UNIV OF TECH
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