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Double-loop constant-frequency control method based on BUCK-LLC (buck-logical link control) two-level DC/DC (direct current/direct current) converter

A control method and converter technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as unfavorable engineering applications, weak anti-interference ability, complex control system design, etc., to achieve Strong anti-load disturbance ability, wide voltage input range and high working efficiency

Active Publication Date: 2017-06-13
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. The stability of the two-stage DC / DC converter system is poor, and the ability to resist external interference is weak
[0010] 2. The design of the control system is complicated, which is not conducive to the actual engineering application
[0011] 3. The input voltage adjustment range of the two-stage DC / DC converter is narrow, which is not conducive to the application in a wide voltage input range
[0012] 4. The response speed of the control system is slow, which is not conducive to the rapid response of the output voltage

Method used

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  • Double-loop constant-frequency control method based on BUCK-LLC (buck-logical link control) two-level DC/DC (direct current/direct current) converter
  • Double-loop constant-frequency control method based on BUCK-LLC (buck-logical link control) two-level DC/DC (direct current/direct current) converter
  • Double-loop constant-frequency control method based on BUCK-LLC (buck-logical link control) two-level DC/DC (direct current/direct current) converter

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0051] figure 1 It is a circuit topology diagram of the present invention, and it can be seen from this figure that the circuit topology involved in the present invention is a two-stage structure, and the front-stage BUCK converter includes a DC input voltage V in , switch tube S1, switch tube S2, inductor L BUCK , output capacitance C in ; The post-stage LLC converter includes switch tube Q1, switch tube Q2, switch tube Q3, switch tube Q4, and resonant inductor L r , Resonant capacitance C r , high frequency transformer T, diode D R1 , Diode D R2 , output capacitance C 0 , output load resistance R 0 .

[0052] The collector of the switch tube S1 is connected to the input voltage V in The positive pole of the switching tube S2 is connected to the emitter of the switching tube S1, and the emitter of the switching tube S2 is connected to the DC input v...

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Abstract

The invention discloses a double-loop constant-frequency control method based on a BUCK-LLC (buck-logical link control) two-level DC / DC (direct current / direct current) converter. The switch frequency of an LLC resonance converter is set to two-element resonance frequency; the output voltage of the BUCK-LLC two-level DC / DC converter is collected by a differential circuit; the inductive current of a BUCK converter is collected by a current sensor to implement double-loop control. The double-loop constant-frequency control method has the advantages that the gain of the LLC resonance converter is not changed, and the output voltage of the BUCK-LLC two-level DC / DC converter is adjusted by regulating the duty cycle of a BUCK converter switch tube through the double-loop control; compared with the traditional single-loop control, the dynamic response speed of the double-loop control is higher, and the steady-state performance is better; the power density of the converter is higher; for a built simulation model of the BUCK-LLC two-level DC / DC converter, the range of input voltage is wider, the anti-load disturbance ability is stronger, and the certain engineering application value is realized.

Description

technical field [0001] The invention relates to a double-loop control method of a two-stage DC / DC converter, in particular to a double-loop fixed-frequency control method based on a BUCK-LLC two-stage DC / DC converter. Background technique [0002] DC / DC converters have a wide range of applications in the industrial field, such as electric vehicle on-board chargers, LED drives, and DC convergence systems for new energy power generation. Soft switching technology is widely used in DC / DC converters, and it can reduce switching loss and EMI interference in ZVS and ZCS modes. [0003] The soft switching technology of LLC resonant converter can realize the ZVS of the primary switching tube and the ZCS of the secondary diode. Its switching frequency is higher than that of traditional soft switching technology, which can significantly increase the power density of the converter while ensuring efficiency. However, when the input voltage range of the LLC converter is large, the swit...

Claims

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Application Information

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IPC IPC(8): H02M3/338
CPCH02M3/3381H02M3/3385
Inventor 张兴刘闯颜瑄赵涛赵文广郭华越
Owner HEFEI UNIV OF TECH
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