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CN-121984346-A - Bidirectional DC-DC converter topological structure

CN121984346ACN 121984346 ACN121984346 ACN 121984346ACN-121984346-A

Abstract

The invention discloses a topological structure of a bidirectional DC-DC converter, which comprises a coupling inductance unit, three power switching tubes and a low-voltage side filter capacitor High-voltage side filter capacitor An auxiliary resonant branch, a coupled inductance unit including primary winding And secondary winding And primary winding And secondary winding Mutual inductance exists between Low voltage side filter capacitor Parallel to low-pressure ports Two ends of the high-voltage side filter capacitor Parallel to the high-pressure port The auxiliary resonant branch comprises resonant damping resistors at two ends And a resonance capacitor . It can provide an improved topology capable of suppressing an oscillation loop current, eliminating a voltage spike, and improving the operational stability and reliability.

Inventors

  • ZHAO SHUANG
  • HE XI
  • Liu Gunyao
  • LI HELONG
  • WEI JINXIAO
  • YANG ZHIQING
  • YANG XIAODONG
  • DING LIJIAN

Assignees

  • 合肥工业大学

Dates

Publication Date
20260505
Application Date
20251219

Claims (10)

  1. 1. A bi-directional DC-DC converter topology comprising: Coupling inductance unit, power switch tube and low-voltage side filter capacitor High-voltage side filter capacitor An auxiliary resonant branch, wherein, The coupled inductance unit comprises a primary winding And secondary winding And the primary winding And secondary winding Mutual inductance exists between ; The power switching tube comprises a first power switching tube S1, a second power switching tube S2 and a third power switching tube S3; the low-voltage side filter capacitor Parallel to low-pressure ports Both ends; The high-voltage side filter capacitor Parallel to the high-pressure port Both ends; The auxiliary resonant branch comprises a resonant damping resistor And a resonance capacitor ; The electrical connection relationship is as follows: The low pressure port Is connected with the secondary winding at the same time Is not the same name terminal, resonance capacitor One end of (2) and resonance damping resistor Is a member of the group; The low pressure port The negative electrode of the second power switch tube S2 is connected with the source electrode and the low-voltage side filter capacitor Is a negative electrode of (a); The secondary winding The same name end of the first power switch tube S1 is connected with the drain electrode of the first power switch tube; the primary winding The non-homonymous end of the third power switch tube S3 is connected with the source electrode of the primary winding Is connected with a resonance capacitor at the same name end Is connected with the other end of the capacitor and is provided with a resonance damping resistor Is arranged at the other end of the tube; The source electrode of the first power switch tube S1 and the drain electrode of the third power switch tube S3 are connected with the high-voltage side filter capacitor in common Is a positive electrode of (a).
  2. 2. The topology of claim 1, wherein said power switching transistors comprise non-ideal metal oxide semiconductor field effect transistor MOSFETs, and said power switching transistors are all connected in parallel with parasitic capacitances 。
  3. 3. The topology of claim 2, wherein said coupled inductor element comprises a non-ideal coupled inductor, said primary winding Includes a first leakage inductance The secondary winding Including a second leakage inductance 。
  4. 4. A topology according to claim 3, characterized in that the primary winding of the coupled inductive unit The equivalent inductance of the serial branch is asymmetric.
  5. 5. The topology of claim 4, wherein said coupled inductive element is connected in parallel across said resonant damping resistor And the resonance capacitor An auxiliary resonance branch circuit formed by series connection.
  6. 6. The topology of claim 5, wherein said resonant capacitor For absorbing the coupling inductance unit in the primary winding And secondary winding High-frequency current components generated at the time of structure switching.
  7. 7. The topology of claim 6, wherein said resonance damping resistance For reducing the flow through the resonant capacitance Is set in the above-described range).
  8. 8. The topology of claim 7, wherein said auxiliary resonant branch is configured to suppress oscillations in terminal voltage of said power switch tube when turned off.
  9. 9. The topology of claim 8, wherein said auxiliary resonant branch is further configured to absorb high frequency current components, and to dampen oscillations of the output voltage to reduce output voltage ripple.
  10. 10. The topology according to any of the claims 1 to 9, characterized in that the low pressure port And the high-pressure port And supports bi-directional transmissions therebetween.

Description

Bidirectional DC-DC converter topological structure Technical Field The invention belongs to the technical field of power electronic conversion, and particularly relates to a topological structure of a bidirectional DC-DC converter. Background In the field of power electronic conversion, a non-isolated high-gain bidirectional DC-DC converter is core equipment for realizing bidirectional transmission of high-low voltage side energy, and the performance of the non-isolated high-gain bidirectional DC-DC converter directly affects the stability, reliability and energy transmission efficiency of the whole system. Under the ideal condition of the converter in the prior art, that is, the switching device ideally has no parasitic parameters such as ON-resistance RDS (ON), parasitic capacitance, parasitic inductance and the like, the coupling inductance has no leakage inductance or is strictly symmetrical, and the bidirectional energy transfer function of forward boosting and reverse reducing can be better realized under the influence of the parasitic parameters which are not existed in the same way as the circuit. However, in the practical application process, the coupling inductance, the switching device and the filter capacitor are not ideal, the topological structure of the converter can be influenced by parasitic parameters and non-pile distribution thereof during operation, and larger voltage peaks and oscillations can be generated on the switching device, the low-voltage side and the high-voltage side filter capacitor, which becomes a technical problem to be solved urgently. Disclosure of Invention The invention aims to provide a topological structure of a bidirectional DC-DC converter, which solves the defects in the prior art and can provide an improved topological structure capable of inhibiting oscillation circulation, eliminating voltage spikes and improving working stability and reliability. One embodiment of the present application provides a bidirectional DC-DC converter topology comprising: Coupling inductance unit, power switch tube and low-voltage side filter capacitor High-voltage side filter capacitorAn auxiliary resonant branch, wherein, The coupled inductance unit comprises a primary windingAnd secondary windingAnd the primary windingAnd secondary windingMutual inductance exists between; The power switching tube comprises a first power switching tube S1, a second power switching tube S2 and a third power switching tube S3; the low-voltage side filter capacitor Parallel to low-pressure portsBoth ends; The high-voltage side filter capacitor Parallel to the high-pressure portBoth ends; The auxiliary resonant branch comprises a resonant damping resistor And a resonance capacitor; The electrical connection relationship is as follows: The low pressure port Is connected with the secondary winding at the same timeIs not the same name terminal, resonance capacitorOne end of (2) and resonance damping resistorIs a member of the group; The low pressure port The negative electrode of the second power switch tube S2 is connected with the source electrode and the low-voltage side filter capacitorIs a negative electrode of (a); The secondary winding The same name end of the first power switch tube S1 is connected with the drain electrode of the first power switch tube; the primary winding The non-homonymous end of the third power switch tube S3 is connected with the source electrode of the primary windingIs connected with a resonance capacitor at the same name endIs connected with the other end of the capacitor and is provided with a resonance damping resistorIs arranged at the other end of the tube; The source electrode of the first power switch tube S1 and the drain electrode of the third power switch tube S3 are connected with the high-voltage side filter capacitor in common Is a positive electrode of (a). Optionally, the power switch tube comprises non-ideal metal oxide semiconductor field effect tube MOSFET, and the power switch tubes are all connected in parallel with parasitic capacitance。 Optionally, the coupled inductance unit comprises non-ideal coupled inductance, the primary windingIncludes a first leakage inductanceThe secondary windingIncluding a second leakage inductance。 Optionally, the primary winding of the coupled inductance unitThe equivalent inductance of the serial branch is asymmetric. Optionally, two ends of the coupling inductance unit are connected in parallel by the resonance damping resistorAnd the resonance capacitorAn auxiliary resonance branch circuit formed by series connection. Optionally, the resonance capacitorFor absorbing the coupling inductance unit in the primary windingAnd secondary windingHigh-frequency current components generated at the time of structure switching. Optionally, the resonance damping resistorFor reducing the flow through the resonant capacitanceIs set in the above-described range). Optionally, the auxiliary resonant branch is used for suppressing the os