LCLCL high-order DC converter based on stacked bridges and control method

A technology of DC converter and control method, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, high-efficiency power electronic conversion, etc. It can solve the problems of limited voltage input range and voltage input fluctuation, and achieve high Conversion efficiency, stable voltage output, and effect of guaranteed voltage output

Pending Publication Date: 2020-09-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the voltage input range of the existing LLC resonant converter is limited and is prone to voltage input fluctuations, the present invention provides a stacked bridge-based LCLCL high-order DC converter and a control method

Method used

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  • LCLCL high-order DC converter based on stacked bridges and control method
  • LCLCL high-order DC converter based on stacked bridges and control method
  • LCLCL high-order DC converter based on stacked bridges and control method

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specific Embodiment approach 1

[0048] Specific implementation mode 1. Combination figure 1 As shown, the first aspect of the present invention provides a kind of LCLCL high-order DC converter based on the stacked bridge, including the switching tube S 1 , switch tube S 2 , switch tube S 3 , switch tube S 4 , Resonant capacitance C r , Resonant inductance L r , transformer T, band stop filter inductor L p , Band stop filter capacitor C p , Diode D 1 , Diode D 2 , output capacitance C 0 , Divider capacitor C in1 and the divider capacitor C in2 ;

[0049] Switch tube S 1 , switch tube S 2 , switch tube S 3 and switch tube S 4 connected in turn to form a stack bridge, the switching tube S 1 and switch tube S 2 Constitute the upper bridge arm, the upper bridge arm is connected in parallel with the voltage dividing capacitor C in1 ;Switch tube S 3 and switch tube S 4 It constitutes the lower bridge arm, and the lower bridge arm is connected in parallel with the voltage dividing capacitor C in...

specific Embodiment approach 2

[0058] Specific embodiment two, combine Figure 1 to Figure 19 As shown, another aspect of the present invention also provides a stacked bridge-based LCLCL high-order DC converter control method for realizing the control of the stacked bridge-based LCLCL high-order DC converter, including:

[0059] Sampling the input voltage of the power supply, when the input voltage is in the low-voltage range, at the switching frequency of 1MHz, the switching tube S 1 and switch tube S 4 As the first group of switching tubes, the switching tube S 2 and switch tube S 3 As the second group of switching tubes, control the two groups of switching tubes to alternately work for half the voltage cycle to realize the frequency conversion working mode;

[0060] When the input voltage is in the high-voltage range, and the switching frequency is 500kHz, the switching tubes S are cyclically controlled in sequence 1 and switch tube S 3 , switch tube S 2 and switch tube S 3 , switch tube S 2 and ...

specific Embodiment

[0083] Specific embodiments: the rated input voltage is 170V and 340V, the corresponding rated operating frequency is 1MHz and 500KHz, the output voltage is stable 20V, and the output power is 40W.

[0084] 1. Frequency conversion working mode:

[0085] When the input voltage is 170V, the working mode of frequency conversion is adopted, that is, the traditional LLC resonant power converter mode. At this time, the equivalent input square wave voltage amplitude is the input voltage, and the frequency is 1MHz.

[0086] 2. Double frequency working mode:

[0087] When the input voltage is 340V, the working mode of frequency doubling is adopted. By controlling the switching sequence of the four switching tubes, the amplitude of the input square wave voltage is equal to that of the input voltage. The frequency of the square wave is half of the frequency of the switching tubes, and the frequency is 1MHz.

[0088] 3. When the input voltage is further increased, the operating frequenc...

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Abstract

The invention discloses an LCLCL high-order DC converter based on stacked bridges and a control method, and belongs to the technical field of power converter design. The problems that the voltage input range of an existing LLC resonant converter is limited, and voltage input fluctuation is likely to be generated are solved. The converter comprises a switching tube S1, a switching tube S2, a switching tube S3 and a switching tube S4 which are sequentially connected to form a stacked bridge; a band elimination filter, a primary side of a transformer T, a resonant inductor Lr and a resonant capacitor Cr are sequentially connected between an upper bridge arm and a lower bridge arm in series; one end of the secondary side of the transformer T is connected with the anode of a diode D1, the cathode of the diode D1 is connected with the cathode of a diode D2, and the anode of the diode D2 is connected with the other end of the secondary side of the transformer T; an output capacitor C0 is connected between the center tap of the secondary side of the transformer T and the cathode of the diode D2; and the output capacitor C0 is connected in parallel with the load resistor RL. According to the invention, wide-range voltage input is realized, and the loss of the secondary side diode is reduced.

Description

technical field [0001] The invention relates to a stacked bridge-based LCLCL high-order DC converter and a control method, and belongs to the technical field of power converter design. Background technique [0002] The voltage input range of the existing LLC resonant converter is limited, and it cannot meet the needs of wide-range input voltage regulation applications; and its power supply quality is not good, and it is easy to generate voltage input fluctuations in occasions such as underground exploration and drilling. Contents of the invention [0003] Aiming at the problem that the existing LLC resonant converter has a limited voltage input range and is prone to voltage input fluctuations, the present invention provides a stacked bridge-based LCLCL high-order DC converter and a control method. [0004] The present invention provides an LCLCL high-order DC converter based on a stacked bridge, including a switching tube S 1 , switch tube S 2 , switch tube S 3 , switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/32
CPCH02M3/28H02M3/33523H02M3/3353H02M1/32H02M1/0058Y02B70/10
Inventor 张相军戴明聪管乐诗王懿杰徐殿国唐瑞鸿井嘉晨孙宇豪朱思妍
Owner HARBIN INST OF TECH
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