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A bidirectional clllc resonant converter with variable capacitance and control method

A resonant converter and variable capacitor technology, which is applied in control/regulation systems, high-efficiency power electronic conversion, output power conversion devices, etc., can solve problems such as deviation from switching frequency, converter transmission power and efficiency drop, and errors. Achieve the effect of maintaining efficient transmission

Active Publication Date: 2021-09-28
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to errors in parameters such as power switching devices, capacitors, and transformer leakage inductance, and they will change with actual power and temperature, the resonant frequency will deviate from the set switching frequency, and the performance of the converter will decrease
In addition, within the converter operating frequency range, the converter's operating frequency may vary according to different requirements and conditions, causing the resonant frequency to deviate from the operating frequency, which will also reduce the converter's transmission power and efficiency, and cannot maintain a stable unit voltage gain

Method used

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  • A bidirectional clllc resonant converter with variable capacitance and control method
  • A bidirectional clllc resonant converter with variable capacitance and control method
  • A bidirectional clllc resonant converter with variable capacitance and control method

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0062] 1. Implementation Mode 1

[0063] Such as figure 1 , Figure 5 to Figure 10 As shown, the primary side resonant tank includes a primary side resonant inductor L1 and two primary side resonant capacitors C1 and C2 connected in series. The secondary side resonant tank includes a secondary side resonant inductor L2 and two secondary side resonant capacitors C3 and C4 that are connected in series.

[0064] Among them, the primary-side resonant inductor L1, the primary-side resonant capacitors C1 and C2, and the primary-side power winding of the transformer T are all connected in series, and the series sequence can be adjusted. One end of the series connection is connected to the midpoint of the first bridge arm, and the other end is connected to Midpoint of the second bridge arm. A transformer excitation inductance Lm is also connected in parallel at both ends of the power winding on the primary side of the transformer T.

[0065] The secondary side resonant inductor L2...

Embodiment approach B

[0081] Such as Figure 5 and Figure 9 As shown, the DC bias application circuit includes an auxiliary switch Sa, an auxiliary inductor La, a first auxiliary diode Da and a second auxiliary diode.

[0082] The auxiliary switch Sa, the auxiliary inductor La, and the first auxiliary diode Da are connected in series, and the second auxiliary diode is connected in parallel at both ends of the auxiliary inductor La (or an auxiliary resistor Ra) and the auxiliary resistor Ra.

Embodiment approach C

[0084] Such as Figure 6 and Figure 8 As shown, the DC bias application circuit includes an auxiliary switch Sa, an auxiliary resistor Ra, and a first auxiliary diode Da connected in series in sequence.

[0085] The aforementioned auxiliary resistor Ra plays the same role as the auxiliary inductor La in Embodiment A.

[0086] 4. Implementation Mode D

[0087] It is basically the same as Embodiment B, except that the auxiliary inductance La is replaced by auxiliary resistance Ra.

[0088] 3. Layout requirements of DC bias application circuit

[0089] In the variable capacitance bidirectional CLLLC resonant converter of the present invention, the number of DC bias applying circuits can be one, two, three or four. For each variable capacitance bidirectional CLLLC resonant converter, any DC bias application circuit topology and any primary side resonant tank and secondary side resonant tank topology in Embodiments A to D can be used. Therefore, there are various layout struc...

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Abstract

The invention discloses a variable capacitance bidirectional CLLLC resonant converter and a control method thereof, which include a primary side full bridge, a secondary side full bridge and a CLLLC resonant cavity; the CLLLC resonant cavity includes a transformer T, a primary side resonant tank and a secondary side Resonant tank, and DC bias application circuit; the primary side resonance tank has two primary side resonance capacitors C1 and C2 connected in series, the secondary side resonance tank has two secondary side resonance capacitors C3 and C4 connected in series, and the DC bias The setting application circuit is connected to both ends of the primary side resonant capacitor C1 and / or the secondary side resonant capacitor C3, and is used for applying a DC bias to C1 and / or C3. When the primary-side resonance frequency and the secondary-side resonance frequency do not match or deviate from the operating frequency, the resonance of the primary-side resonance tank and / or the secondary-side resonance tank is changed by adjusting the duty cycle of the auxiliary switch in the DC bias application circuit Capacitance value, and then make the resonant frequency of the primary side and the resonant frequency of the secondary side match or return to the working frequency.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a variable capacitance bidirectional CLLLC resonant converter and a control method. Background technique [0002] In order to realize the connection between DC microgrid and DC distribution network or between DC distribution networks of different voltage levels, high-power DC converters are widely used to realize the transmission and conversion of DC power. Because traditional power transformers are difficult to achieve DC conversion, DC power distribution systems often need to rely on power electronic converters to achieve power transmission. The isolated bidirectional dc-dc converter (IBDC) is an important power electronic converter. With its advantages of galvanic isolation, bidirectional power transmission, symmetry and modularization, it can realize DC microgrid voltage And the flexible control of power has received extensive attention. Among them, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/32
CPCH02M1/32H02M3/28H02M3/33584H02M1/0048Y02B70/10
Inventor 金平卢意夏志鹏常岭田煜窦卓慧
Owner HOHAI UNIV
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