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LLC resonant converter based on switch control inductor and control method

A resonant converter, switching control technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc., can solve problems such as high cost and difficult physical design, achieve low voltage and current stress, design and testing Ease, the effect of reducing manufacturing costs and time

Inactive Publication Date: 2021-07-09
CHANGZHOU TIANMAN INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It reduces the weight compared to conventional converters, however, it also has some disadvantages such as the need for high-voltage power semiconductor switches, high cost, and difficulty in physical design, etc.

Method used

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  • LLC resonant converter based on switch control inductor and control method
  • LLC resonant converter based on switch control inductor and control method
  • LLC resonant converter based on switch control inductor and control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as Figure 4 As shown, this embodiment provides an LLC resonant converter based on switch-controlled inductors, including an H-bridge inverter, a resonant network, a rectifier network and a low-pass filter network connected in sequence, and the resonant network includes a resonant inductor and a resonant The capacitor also includes a switch control inductor SCI, which is connected in parallel with the resonant inductor. On the premise of keeping the switching frequency constant, the variable reactance control is realized by using the SCI, and the topology of the scheme is simple.

[0040] SCI is a mechanism that uses a semiconductor power switch to control inductive reactance, which can be realized by a linear inductor and a power switch in series. SCI includes serial full-wave SCI and parallel full-wave SCI, such as figure 1 (1a) and (1b) shown. A series-type full-wave SCI consists of two series networks consisting of a switch and a diode connected in anti-paral...

Embodiment 2

[0049] In the LLC resonant converter based on switch-controlled inductors provided by this implementation, in the resonant inductor L a Add a transformer between SCI and SCI, such as Figure 5 shown. The transformer can be used as a resonant inductor L a , the leakage inductance can be used as the SCI inductance L b , and the appropriate switching device can be flexibly selected by adjusting the turn ratio. All the other are with embodiment 1.

[0050] The equivalent inductance Ls of the resonant inductance of the SCI parallel network and the LLC resonant converter is shown in formula (3):

[0051]

[0052] L eq The value can be determined by formula (2).

[0053] Therefore, the equivalent inductance L s It can be adjusted by changing β. When β=π, L s is the maximum value, equal to L a . When β=π / 2, L s is the minimum value, equal to L a ‖ L b . In fact, to avoid L eq = ∞, the maximum value of β>0.9π is avoided, because L eq The increase of is exponential i...

Embodiment 3

[0080] The converter of this embodiment is applied to a modular power system structure. In a modular power system structure, the configuration of the converter includes input series output series (ISOS), input series output parallel (ISOP), input parallel output series (IPOS) ) and input-parallel-output-series (IPOS) converters. Any of the aforementioned modular structures of the proposed converter scheme can be applied without introducing any complexity.

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PUM

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Abstract

The invention relates to an LLC resonant converter based on a switch control inductor and a control method. The converter comprises an H-bridge inverter, a resonant network, a rectification network and a low-pass filtering network which are connected in sequence; the resonant network comprises a resonant inductor and a resonant capacitor, and the converter also comprises the switch control inductor SCI; and the switch control inductor is connected in parallel with the resonant inductor. Compared with the prior art, the LLC resonant converter has the advantages of simple structure, low loss and the like.

Description

technical field [0001] The invention relates to an LLC resonant converter, in particular to an LLC resonant converter based on a switch-controlled inductor and a control method. Background technique [0002] Compactness and cost-effectiveness are the primary requirements for HVDC and MVDC power systems. As an important part of these power systems, power electronic devices such as DC-DC converters play an important role in the compactness index of the entire power system. Increasing the switching frequency of the converter system overcomes the size issue to some extent, but also brings about a significant increase in switching losses due to parasitic capacitance and inductance. Applying a resonant converter to realize zero-current switching (ZCS) or zero-voltage switching (ZVS) to reduce switching loss is one of the methods widely used at present. [0003] Resonant converters are a broad category of DC / DC converters and are suitable for high-frequency and high-power applica...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/08H02M7/5387H02M1/12
CPCH02M1/083H02M1/12H02M3/33569H02M7/53871Y02B70/10
Inventor 曼苏乐徐雅梅
Owner CHANGZHOU TIANMAN INTELLIGENT TECH
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