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A buckboost circuit and its control method

A circuit control and circuit technology, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., can solve the problems of low efficiency of the power supply system, the efficiency cannot meet the practical requirements, and the operation is complicated, so as to improve the efficiency of the circuit, The effect of optimal system performance and efficiency and low cost

Active Publication Date: 2019-11-05
XIAN TELD LINCHR NEW ENERGY TECH CO LTD
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Problems solved by technology

Therefore, when switching modes with the relay, its efficiency cannot meet the practical requirements, the operation is more complicated, and the efficiency of the power system is not high

Method used

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  • A buckboost circuit and its control method
  • A buckboost circuit and its control method
  • A buckboost circuit and its control method

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0040] The present invention can realize the seamless switching method of the working mode of the BuckBoost circuit. Different from the control method in the prior art, the present invention switches the working mode of the BuckBoost in real time according to the modulation ratio obtained by instantaneous calculation, and the shortest switching time between the modes is one interruption period .

[0041]In the present invention, the operation mode switching of the BuckBoost circuit is interlocked with the action logic of the bypass relay. Based on the above-mentioned real-time identification method of the working mode, the corresponding high-efficiency flag is set in the working mode of each circuit as the pull-in condition of the corresponding relay. In order to avoid the impact of frequent...

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Abstract

The present invention provides a BuckBoost circuit and a control method thereof. The method includes: in the fixed-frequency width modulation mode of the BuckBoost circuit, the controller calculates the modulation ratio M in real time according to the given output voltage and the sampled value of the output voltage; the controller calculates the modulation ratio M according to the modulation ratio M The steps of controlling the bypass relay of the Buck switch tube and the bypass relay of the Boost diode respectively; the steps of controlling the bypass control of the Buck switch tube and the Boost diode by the controller through the bypass relay respectively, and realizing the working mode control of the BuckBoost circuit; the circuit includes A Buck switch tube bypass relay for bypassing the Buck switch tube, a Boost diode bypass relay for bypassing the Boost diode, a flying relay arranged between the Buck switch tube and the Boost diode, and a controller; The invention can effectively improve circuit efficiency, has low cost, reduces circuit loss, operates safely and reliably without being affected by circuit topological functions, and realizes optimum system performance and efficiency. Through the control of the flag bit, the safe and reliable operation of the system under the topology is realized.

Description

technical field [0001] The invention belongs to the technical field of power supplies and relates to BuckBoost circuit control, in particular to a BuckBoost circuit and a control method thereof. Background technique [0002] High efficiency is one of the important qualities of power supply products. There are three ways to improve its efficiency: [0003] 1) Reduce loss and improve efficiency by improving device performance; [0004] 2) Apply soft switching technology to reduce device loss; [0005] 3) Low impedance switching devices are used to bypass power devices to reduce system losses. [0006] These three approaches differ in terms of performance, cost, and ease of implementation. Among them, improving the performance of the device is the fundamental way to reduce the loss of the device, but the performance of the device is subject to the process, and with the improvement of the performance of the device, the cost of the device will increase exponentially; the soft ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582H02M1/0058Y02B70/10
Inventor 武荣王利强张丽娟
Owner XIAN TELD LINCHR NEW ENERGY TECH CO LTD
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