A kind of bidirectional dc/dc converter and its control method
A control method and converter technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of uneven current, soft switching loss, small output current ripple of interleaved parallel converters, etc. , to achieve the effect of avoiding uneven current, low soft switching loss, and expanding the power of the converter
Active Publication Date: 2020-03-10
费莱(浙江)科技有限公司
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Problems solved by technology
[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention proposes a bidirectional DC / DC converter and its control method, adopting the cascaded and parallel interleaved structure of the two-stage DC / DC converter, which can not only play a role in the soft switching of the LLC converter The advantages of low loss and small output current ripple of interleaved parallel converters can also avoid the problem of current unevenness caused by inconsistent parameters when LLC converters are connected in parallel
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[0027] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0028] figure 1 It is a topological diagram of a DC / DC converter according to an embodiment of the present invention.
[0029] refer to figure 1 , The DC / DC converter in this embodiment includes: a front-stage converter and a rear-stage converter, and the front-stage converter and the rear-stage converter are in an interleaved parallel structure. Among them, the front-stage converters are interleaved with fixed-frequency operation, and the rear-stage converters are interleaved with voltage and current double closed-loop operation. The control schematic diagram is as follows: image 3 As shown, the p...
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The invention discloses a bidirectional DC / DC converter and a control method thereof. The converter comprises: a front-stage converter and a rear-stage converter which are interleaved and parallel-connected, the front-stage converter operates at a fixed frequency interleaved, and the rear-stage converter is Interleaved voltage and current double closed-loop operation. The method includes: during forward / reverse operation, controlling the post-stage converter to generate a current command through the voltage outer loop, and then comparing the detected inductor current with the current command, and adjusting the current in the post-stage converter The duty cycle of the multiple converters is used to make the currents of the multiple converters the same; thus, the output / input voltages of the multiple converters in the previous stage converter are different. The bidirectional DC / DC converter and its control method of the present invention can not only take advantage of the advantages of low soft switching loss of the LLC converter and the small output current ripple of the interleaved parallel converter, but also avoid the problems caused by inconsistent parameters when the LLC converters are connected in parallel. The problem of uneven current.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a bidirectional DC / DC converter and a control method thereof. Background technique [0002] The LLC resonant converter is a resonant circuit that achieves a constant output voltage or output current by controlling the switching frequency. Its advantage is that it can effectively reduce the switching loss of the switching tube through soft switching technology, and improve the efficiency and power density of the converter. However, the output of the LLC resonant converter does not have inductance filtering, resulting in large current ripple and affecting the life of the capacitor. Therefore, in high-power applications, LLC needs to be used in interleaved parallel connection. [0003] Unlike the traditional PWM converter which can adjust the duty ratio and current sharing, the LLC converter cannot adjust the frequency current sharing, otherwise the frequency of the LLC co...
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IPC IPC(8): H02M3/335H02M3/158H02M1/14
CPCH02M1/14H02M3/1584H02M3/33584H02M1/0058H02M3/1586Y02B70/10
Inventor 王勇刘亚孙佳
Owner 费莱(浙江)科技有限公司