Frequency-adjustable high-gain boost flyback DC-DC converter
By designing a frequency-adjustable high-gain boost flyback DC-DC converter, the charging and discharging process of the switching transistors and capacitors is utilized to solve the problem of performance degradation in high-gain applications of traditional boost converters, achieving a high-efficiency, low-cost high-gain boost effect.
Patent Information
- Application Number
- CN202520364796.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-04
AI Technical Summary
Traditional boost converters suffer from performance degradation in high-gain applications due to increased semiconductor voltage stress, high conduction and reverse recovery losses, and shortened lifespan, failing to meet high-gain requirements.
Design a frequency-adjustable high-gain boost flyback DC-DC converter. By combining the input source, input inductor, magnetic core, pre-amplifier and post-amplifier units, and using the switching control of the switching transistors, high-gain boost is achieved. By employing specific types of MOSFETs and diodes, combined with the charging and discharging process of the capacitor, the voltage gain is improved and the voltage stress is reduced.
It achieves high-gain boost effect, reduces power supply voltage requirements, improves converter reliability and efficiency, simplifies control circuit, and reduces cost.
Smart Images
Figure CN223859036U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of power electronics, specifically relates to a high gain boost flyback DC-DC converter of adjustable frequency. BACKGROUND
[0002] With growing energy demand for renewable energy, growing energy demand, plus rising costs of fossil fuels and global concerns about pollution emissions, favor the expansion of renewable energy penetration. However, before integrating these power sources into an AC or DC grid, it is necessary to step up.
[0003] Due to the small number of components, simple structure and low cost, the traditional boost converter is still used in many applications. In theory, the static gain can be set to an infinite level by adjusting its duty cycle to a value close to 1, however, in practice, due to the increase in voltage stress on the semiconductor, conduction and reverse recovery losses, and large current ripples, these all contribute to deteriorating performance and shortening the life cycle, so it is not feasible to use traditional boost converters for high gain applications. SUMMARY
[0004] The utility model aims at providing a high gain boost flyback DC-DC converter of adjustable frequency to overcome the deficiency that the traditional boost converter of prior art cannot be used in the scene of high gain demand.
[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme to realize:
[0006] A high gain boost flyback DC-DC converter of adjustable frequency, comprising an input source, an input inductor, a magnetic core, a circuit front-end unit, a circuit back-end unit, a load resistor and a load inductor;
[0007] The first end of the input inductor is connected to the input source, and the second end of the input inductor is connected to the circuit front-end unit, and the circuit front-end unit is connected to the circuit back-end unit through the magnetic core; the load resistor and the load inductor are connected in series and connected in parallel between the two ends of the circuit front-end unit and the circuit back-end unit.
[0008] Further, the circuit front-end unit comprises a primary coil group, a first switch tube, a second switch tube, a third capacitor, a first diode and a second diode, and the primary coil group comprises two primary coils.
[0009] The second end of the input inductor is connected to the primary coil group, the primary coil group is connected to the anode of the first diode and the second diode and connected to the first switch tube and the second switch tube, the cathode of the first diode and the second diode is connected to the first end of the third capacitor, and the negative electrode of the input source is connected to the source of the first switch tube and the second switch tube and the second end of the third capacitor.
[0010] Further, the circuit rear unit comprises a secondary coil group, a first capacitor, a second capacitor, a third diode and a fourth diode, and the secondary coil group comprises two secondary coils.
[0011] The anodes of the third diode and the fourth diode are connected with the two secondary coils respectively, the cathode of the third diode is connected with the first end of the first capacitor, the cathode of the fourth diode is connected with the first end of the second capacitor, the second end of the first capacitor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the cathodes of the first diode and the second diode in the circuit front unit.
[0012] Further, the cathode of the third diode is connected with the first end of a load resistor, the second end of the load resistor is connected with the first end of a load inductor, and the second end of the load inductor is connected with the cathode of an input source.
[0013] Further, the anode of the first diode is connected with the drain of a first switch tube, and the anode of the second diode is connected with the drain of a second switch tube.
[0014] Further, the first switch tube and the second switch tube are both MOS tubes with the model number C2M0025120.
[0015] Further, the first diode and the second diode are both Schottky diodes with the model number MBR40250.
[0016] Further, the third diode and the fourth diode are both diodes with the model number MUR840.
[0017] Further, the first capacitor, the second capacitor and the third capacitor are all polyester capacitors.
[0018] Further, the input voltage of the input source is 60V.
[0019] Compared with the prior art, the high-gain boost-reverse-flyback DC-DC converter has the following beneficial technical effects:
[0020] The high-gain boost-reverse-flyback DC-DC converter has the following beneficial technical effects:
[0021] Specifically, by switching on and off of the switch tube, the four coupling inductances of the two primary coils and the two secondary coils, the first capacitor, the second capacitor and the third capacitor are charged and discharged, so that the high gain effect is realized; the voltage stress of the first switch tube and the second switch tube is low, the voltage gain of the high gain boost converter is improved; the two switch tube driving signals are synchronous, so that the control circuit is simple and effective, the structure is simple, the cost of the high gain boost converter is reduced, and the efficiency of the converter is improved. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a kind of adjustable frequency high gain boost flyback DC-DC converter top schematic diagram in the embodiment of the utility model.
[0023] Figure 2 It is a kind of adjustable frequency high gain boost flyback DC-DC converter first kind of working state schematic diagram in the embodiment of the utility model.
[0024] Figure 3 It is a kind of adjustable frequency high gain boost flyback DC-DC converter second kind of working state schematic diagram in the embodiment of the utility model.
[0025] Figure 4 It is a kind of adjustable frequency high gain boost flyback DC-DC converter third kind of working state schematic diagram in the embodiment of the utility model.
[0026] Figure 5 It is a kind of adjustable frequency high gain boost flyback DC-DC converter fourth kind of working state schematic diagram in the embodiment of the utility model.
[0027] Figure 6 It is a kind of adjustable frequency high gain boost flyback DC-DC converter fifth kind of working state schematic diagram in the embodiment of the utility model.
[0028] Figure 7 It is a kind of adjustable frequency high gain boost flyback DC-DC converter sixth kind of working state schematic diagram in the embodiment of the utility model.
[0029] In the figure, Vi, input source;C1, first capacitor;C2, second capacitor;C3, third capacitor;C4, fourth capacitor;S1, first switch tube;S2, second switch tube;Db1, first diode;Db2, second diode;Df1, third diode;Df2, fourth diode;T1, magnetic core;N1, primary coil;N2, secondary coil;R, load resistance;Lg, load inductance;L, input inductance. DETAILED DESCRIPTION
[0030] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.
[0031] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0032] As shown in Figure 1 The adjustable frequency high-gain boost flyback DC-DC converter of the present application specifically includes an input source Vi, an input inductor L, a magnetic core T1, a circuit front-end unit, a circuit back-end unit, a load resistor R and a load inductor Lg. The input voltage of the input source Vi is 60V.
[0033] The first end of the input inductor L is connected to the input source Vi, and the second end of the input inductor L is connected to the circuit front-end unit. The circuit front-end unit is connected to the circuit back-end unit through the magnetic core T1. The load resistor R and the load inductor Lg are connected in series and connected in parallel between the circuit front-end unit and the circuit back-end unit. The circuit front-end unit is provided with voltage by the input source Vi, and the circuit back-end unit is provided with suitable voltage by the magnetic field of the magnetic core T1 for the load resistor R.
[0034] In some preferred embodiments of the present application, the circuit front-end unit includes a primary coil group, a first switch tube S1, a second switch tube S2, a third capacitor C3, a first diode Db1 and a second diode Db2. The primary coil group includes two primary coils N1. The first switch tube S1 and the second switch tube S2 are both MOS tubes with model number C2M0025120, and the first diode Db1 and the second diode Db2 are Schottky diodes with model number MBR40250.
[0035] The second end of the input inductor L is connected with a primary coil group, the primary coil group is connected with the positive poles of a first diode Db1 and a second diode Db2, the positive pole of the first diode Db1 is connected with the drain of a first switch tube S1, the positive pole of the second diode Db2 is connected with the drain of a second switch tube S2, the negative poles of the first diode Db1 and the second diode Db2 are connected with the first end of a third capacitor C3, and the negative pole of the input source Vi is connected with the sources of the first switch tube S1 and the second switch tube S2 and the second end of the third capacitor C3.
[0036] The circuit post-stage unit comprises a secondary coil group, a first capacitor C1, a second capacitor C2, a third diode Df1 and a fourth diode Df2, and the secondary coil group comprises two secondary coils N2; wherein the third diode Df1 and the fourth diode Df2 are diodes of MUR840, and the first capacitor C1, the second capacitor C2 and the third capacitor C3 are polyester capacitors.
[0037] The positive poles of the third diode Df1 and the fourth diode Df2 are connected with the two secondary coils N2 respectively, the negative pole of the third diode Df1 is connected with the first end of the first capacitor C1, the negative pole of the fourth diode Df2 is connected with the first end of the second capacitor C2, the second end of the first capacitor C1 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 is connected with the negative poles of the first diode Db1 and the second diode Db2 in the circuit pre-stage unit, the negative pole of the third diode Df1 is connected with the first end of a load resistor R, the second end of the load resistor R is connected with the first end of a load inductor Lg, and the second end of the load inductor Lg is connected with the negative pole of the input source Vi.
[0038] The adjustable frequency high-gain boost-reverse-flip DC-DC converter provided by the utility model has six working modes, wherein Lf is the magnetization inductance of two primary winding coils in the process of running of the converter. Figures 2 to 7
[0039] The first working mode:
[0040] As shown in FIG. Figure 2 In the working mode, the first switch tube S1 is closed, the second switch tube S2 is disconnected, the input inductor L starts to release energy, the first diode Db1 and the fourth diode Df2 are in reverse bias state, keep blocking state, prevent current from flowing reversely, the second diode Db2 and the third diode Df1 are in forward bias state, open and conduct current, charge the first capacitor C1, the second capacitor C2 and the third capacitor C3, and the load inductor Lg stores energy.
[0041] The second working mode:
[0042] As shown in FIG. Figure 3 As shown, in this operating mode, the first switch S1 is closed, the second switch S2 is open, the input inductor L begins to release energy, the first diode Db1, the second diode Db2 and the fourth diode Df2 are all in reverse bias, maintaining a blocking state and preventing current from flowing in the opposite direction, the third diode Df1 is in forward bias, turning on and conducting current, the first capacitor C1 is charged, and the second capacitor C2 and the third capacitor C3 are discharged.
[0043] The third working mode:
[0044] like Figure 4 As shown, in this operating mode, the first switch S1 is closed, the second switch S2 is open, the input inductor L begins to release energy, the magnetizing inductor Lf freewheels through the primary coil N1, the first capacitor C1 is charged, and the second capacitor C2 and the third capacitor C3 are both in a discharging state; the load inductor Lg, the first capacitor C1 are charged, and the second capacitor C2 and the third capacitor C3 freewheel in this circuit.
[0045] The fourth working mode:
[0046] like Figure 5 As shown, in this operating mode, the second switch S2 is closed, the first switch S1 is open, the input inductor L releases energy, the first diode Db1 and the fourth diode Df2 conduct current, the magnetized inductor Lf stores energy, and the second capacitor C2 and the third capacitor C3 are in a charging state.
[0047] The fifth working mode:
[0048] like Figure 6 As shown, in this operating mode, the second switch S2 is closed, the first switch S1 is open, the input inductor L releases energy, the fourth diode Df2 turns on to conduct current, the first diode Db1, the second diode Db2 and the fourth diode Df1 are all in the blocking state, the first capacitor C1 is in the charging state, and the second capacitor C2 and the third capacitor C3 are in the discharging state.
[0049] The sixth working mode:
[0050] like Figure 7 As shown, in this operating mode, the second switch S2 is closed, the first switch S1 is open, the input inductor L releases energy, the magnetizing inductor Lf freewheels through the primary coil N1, the first capacitor C1 is charged, the second capacitor C2 and the third capacitor C3 are both in a discharging state, the load inductor Lg and the first capacitor C1 are charged, and the second capacitor C2 and the third capacitor C3 freewheel in this circuit.
[0051] In summary, by selectively controlling and turning on each switch, the voltage is raised through the capacitor.
[0052] The high-gain boost-reverse-flashing DC-DC converter has high boost capacity, is suitable for low-voltage places, has low required power supply voltage, has lower voltage stress on the switch and filter inductor, is low in cost and high in efficiency.
[0053] The above is only used for describing the technical idea of the utility model, and cannot be used for limiting the protection scope of the utility model, and any modification made on the basis of the technical scheme according to the technical idea of the utility model falls into the protection scope of the utility model claim.
Claims
1. A frequency-adjustable high-gain boost-reverse flyback DC-DC converter, characterized in that, The input source, the input inductor, the magnetic core, the circuit front-end unit, the circuit back-end unit, the load resistor and the load inductor are included. The first end of the input inductor is connected to the input source, and the second end of the input inductor is connected to the circuit front-end unit, and the circuit front-end unit is connected to the circuit back-end unit through the magnetic core; the load resistor and the load inductor are connected in series and are connected in parallel between the circuit front-end unit and the circuit back-end unit.
2. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 1, characterized in that, The circuit front-end unit includes a primary coil group, a first switch tube, a second switch tube, a third capacitor, a first diode and a second diode, and the primary coil group includes two primary coils. The second end of the input inductor is connected to the primary coil group, the positive poles of the first diode and the second diode are connected to the primary coil group, and the first switch tube and the second switch tube are connected to the primary coil group, the negative poles of the first diode and the second diode are connected to the first end of the third capacitor, and the negative pole of the input source is connected to the source of the first switch tube and the second switch tube and the second end of the third capacitor.
3. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 2, characterized in that, The circuit back-end unit includes a secondary coil group, a first capacitor, a second capacitor, a third diode and a fourth diode, and the secondary coil group includes two secondary coils. The positive poles of the third diode and the fourth diode are respectively connected to the two secondary coils, the negative pole of the third diode is connected to the first end of the first capacitor, the negative pole of the fourth diode is connected to the first end of the second capacitor, the second end of the first capacitor is connected to the first end of the second capacitor, and the second end of the second capacitor is connected to the negative poles of the first diode and the second diode in the circuit front-end unit.
4. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 3, characterized in that, The negative pole of the third diode is connected to the first end of the load resistor, the second end of the load resistor is connected to the first end of the load inductor, and the second end of the load inductor is connected to the negative pole of the input source.
5. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 2, characterized in that, The positive pole of the first diode is connected to the drain of the first switch tube, and the positive pole of the second diode is connected to the drain of the second switch tube.
6. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 2, characterized in that, The first switch tube and the second switch tube are both MOS tubes with the model C2M0025120.
7. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 2, characterized in that, The first diode and the second diode are Schottky diodes with the model MBR40250.
8. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 3, characterized in that, The third diode and the fourth diode are diodes with the model MUR840.
9. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 3, characterized in that, The first capacitor, the second capacitor and the third capacitor are all polyester capacitors.
10. The frequency-adjustable high-gain boost-revert DC-DC converter according to claim 1, characterized in that, The input voltage of the input source is 60V.