High-boost DC-DC converter with mixed structure
By using a combination of IGBT and Schottky diodes in DC-DC converters, combining switching inductor and capacitance structures, the problems of many devices, high cost and low efficiency in the prior art are solved, and high boosting capabilities and low voltage-reinforcement are achieved Loss DC conversion is suitable for a variety of occasions.
Patent Information
- Application Number
- CN202421034297.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When existing DC-DC converters achieve high performance, there are many devices, high costs, low efficiency, and the stress of switching devices increases, making the converter poor efficiency.
A hybrid structure high-boost DC-DC converter is adopted. Through the combination of IGBT and Schottky diodes, combined with switching inductor and capacitor structure, it reduces the number of devices, improves efficiency, and reduces voltage stress.
It realizes high boost capability, low cost, low loss and high efficiency DC conversion, suitable for a variety of occasions, reduces the number of active and passive devices, and reduces the voltage stress of switches and filters.
Smart Images
Figure CN222262497U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power electronics, and in particular relates to a DC-DC converter with a hybrid structure and high voltage boost. Background Art
[0002] With the continuous development of power electronics technology and devices, various high-power and high-efficiency power devices have been introduced, and the demand for DC-DC converters has been increasing. Although they have simple structures, they are used everywhere. In the past design schemes, in order to achieve high performance, there are often a large number of active and passive devices. Therefore, the cost of the devices has increased and the loss is large. The high-gain DC-DC converters that were subsequently developed have some improvements over traditional converters, but there are also problems such as increased stress on switching devices and low converter efficiency. Utility Model Content
[0003] In view of the problems existing in the prior art, the utility model provides a hybrid structure high-boost DC-DC converter to solve the problem of voltage gain in the related technology.
[0004] The utility model is realized by the following technical solutions:
[0005] A hybrid structure high-boost DC-DC converter comprises an input source Vs, wherein the positive electrode of the input source Vs is connected to one end of an inductor L1 and the collector of a switch tube S2, and the negative electrode is connected to one end of the inductor L2 and the emitter of the switch tube S1; the collector of the switch tube S1 is connected to the negative electrode of a diode D3, the positive electrode of a diode D4 and one end of the inductor L3, and the emitter of the switch tube S2 is connected to the other end of the inductor L2, the negative electrode of a capacitor C1 and the negative electrode of an output terminal Vo; the positive electrode of the diode D3 is connected to the other end of the inductor L1, the positive electrode of the diode D1 and the negative electrode of the capacitor C3; the other end of the inductor L3 is connected to the positive electrode of the capacitor C3 and the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the negative electrode of the capacitor C2, the negative electrode of the diode D1 and the positive electrode of the capacitor C1; the positive electrode of the capacitor C2 is connected to the negative electrode of the diode D4 and one end of the inductor L4, and the other end of the inductor L4 is connected to the positive electrode of the output terminal Vo.
[0006] Furthermore, the switch tube S1 and the switch tube S2 are IGBTs with the same duty cycle.
[0007] Furthermore, the switch tube S1 and the switch tube S2 are both IGBTs of model IKW40N120CS6XKSA1.
[0008] Furthermore, the capacitor C1, the capacitor C2 and the capacitor C3 are all electrolytic capacitors.
[0009] Furthermore, the metal foil of the electrolytic capacitor is the positive electrode, the positive electrode is attached with an electrolyte, and the negative electrode of the electrolytic capacitor includes a conductive material and an electrolyte.
[0010] Furthermore, the diode D1 and the diode D2 are both Schottky diodes.
[0011] Furthermore, the diode D3 and the diode D4 are both Schottky diodes.
[0012] Furthermore, the diode D1 and the diode D2 are both Schottky diodes of model STPS745G-TR.
[0013] Furthermore, the diode D3 and the diode D4 are both Schottky diodes of STPS745G-TR.
[0014] Furthermore, the input voltage of the input source Vs is 48V.
[0015] Compared with the prior art, the utility model has the following beneficial technical effects:
[0016] The utility model provides a hybrid structure high-boost DC-DC converter, comprising an input source Vs, wherein the positive electrode of the input source Vs is connected to one end of an inductor L1 and the collector of a switch tube S2, and the negative electrode is connected to one end of the inductor L2 and the emitter of the switch tube S1; the collector of the switch tube S1 is connected to the negative electrode of a diode D3, the positive electrode of a diode D4 and one end of the inductor L3, the emitter of the switch tube S2 is connected to the other end of the inductor L2, the negative electrode of a capacitor C1 and the negative electrode of an output terminal Vo; the positive electrode of the diode D3 is connected to the other end of the inductor L1, the positive electrode of the diode D1 and the negative electrode of the capacitor C3. The other end of the inductor L3 is connected to the positive electrode of the capacitor C3 and the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the negative electrode of the capacitor C2, the negative electrode of the diode D1, and the positive electrode of the capacitor C1; the positive electrode of the capacitor C2 is connected to the negative electrode of the diode D4 and one end of the inductor L4, and the other end of the inductor L4 is connected to the positive electrode of the output terminal Vo; the present application has a high voltage boost capability and is suitable for DC conversion circuits in many occasions. It also has the advantages of a switched inductor and a switched capacitor structure, requires fewer active and passive devices, has lower voltage stress on its switch and filter inductor, has low cost, and high efficiency. The loss is also relatively small at higher power. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a topology diagram of a DC-DC converter with a hybrid structure and high voltage boost according to the utility model.
[0018] Figure 2 This is a schematic diagram of the first working state of the DC-DC converter with high voltage boost based on a hybrid structure according to the utility model.
[0019] Figure 3 This is a schematic diagram of the second working state of the DC-DC converter with high voltage boost based on a hybrid structure according to the utility model.
[0020] Figure 4 This is a schematic diagram of the third working state of the DC-DC converter with a hybrid structure and high voltage boost according to the utility model. DETAILED DESCRIPTION
[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.
[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, products or devices.
[0024] like Figure 1As shown, this embodiment discloses a hybrid structure high-boost DC-DC converter, including an input source Vs, wherein the positive electrode of the input source Vs is connected to one end of the inductor L1 and the collector of the switch tube S2, and the negative electrode is connected to one end of the inductor L2 and the emitter of the switch tube S1; the collector of the switch tube S1 is connected to the negative electrode of the diode D3, the positive electrode of the diode D4 and one end of the inductor L3, and the emitter of the switch tube S2 is connected to the other end of the inductor L2, the negative electrode of the capacitor C1 and the negative electrode of the output terminal Vo; the positive electrode of the diode D3 is connected to the other end of the inductor L1, the positive electrode of the diode D1, and the negative electrode of the capacitor C3; the other end of the inductor L3 is connected to the positive electrode of the capacitor C3 and the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the negative electrode of the capacitor C2, the negative electrode of the diode D1, and the positive electrode of the capacitor C1; the positive electrode of the capacitor C2 is connected to the negative electrode of the diode D4 and one end of the inductor L4, and the other end of the inductor L4 is connected to the positive electrode of the output terminal Vo.
[0025] Preferably, the switch tube S1 and the switch tube S2 use IGBTs with the same duty cycle; the switch tube S1 and the switch tube S2 use two IGBTs with the same duty cycle, and the number of devices that generate high voltage gain can be reduced through the combination of switch capacitors and switch inductors; at the same time, it has the advantages of switch inductor and switch capacitor structures, still has ultra-high efficiency in a wide working range, and has smaller input ripple and voltage stress compared with the same type of converters, thereby improving the overall working efficiency.
[0026] Specifically, in the embodiment of the present disclosure, the switch tube S1 and the switch tube S2 both use IGBT of model IKW40N120CS6XKSA1; it should be noted that the IGBT of model IKW40N120CS6XKSA1 has a withstand voltage of 1.2kV and can have excellent performance in high voltage applications; the maximum continuous current Ic of the collector is 80A, and can withstand the passage of large current; the power consumption (Pd-power dissipation) is 500W, the operating temperature range is from -40°C to +175°C, the maximum gate / emitter voltage is 20V, the collector-emitter saturation voltage is 1.85V, and the gate-emitter leakage current is 600nA.
[0027] Preferably, the capacitors C1, C2 and C3 are all electrolytic capacitors; specifically, the metal foil of the electrolytic capacitor is the positive electrode, the positive electrode is attached with an electrolyte, and the negative electrode of the electrolytic capacitor includes a conductive material and an electrolyte; when the electrolytic capacitor is connected to a power source, the electrons on the positive electrode will flow from the power source into the electrolyte to form an electron flow. This electron flow will further cause the cations in the solution to move toward the negative electrode, while the anions will move toward the positive electrode. This ion migration realizes the function of the electrolytic capacitor to store and release charge.
[0028] Preferably, the diode D1, the diode D2, the diode D3 and the diode D4 are all Schottky diodes; specifically, the diode D1, the diode D2, the diode D3 and the diode D4 are all Schottky diodes of model STPS745G-TR; specifically, the voltage-DC reverse (Vr) maximum value of the STPS745G-TR is 45V, the current-average rectification (Io) is 7.5A, its speed is fast recovery, and the reverse recovery time is moderate; in addition, its voltage-forward (Vf) at different If is 840mV@15A, the installation type is surface mount type, and the packaging forms include TO-263-3, D2Pak, TO-263AB, etc.
[0029] Preferably, the input voltage of the input source Vs is 48V.
[0030] A hybrid structure high-boost DC-DC converter disclosed in this embodiment includes the following working modes:
[0031] The first working mode:
[0032] like Figure 2 As shown in the figure, in this working mode, the inductor current is in a continuous state. The switch tube S1 and the switch tube S2 are closed at the same time, and the input voltage source magnetizes the inductors L1 and L2 when the switch tube is turned on. At this time, the input voltage source and the capacitor C1, the magnetizing inductor L3 and the capacitor C3 are connected in parallel and charged. At the same time, the energy stored in C1 and C2 is discharged to the inductor L4 and the load, and the output voltage is kept constant.
[0033] The second working mode:
[0034] like Figure 3 As shown, in this working mode, the switch tube S1 and the switch tube S2 are turned on at the same time, and the inductor current is in a continuous state. At this time, the inductor L1, the inductor L2, the inductor L3, the capacitor C3 and the input voltage source Vs continuously provide power to the load end in a cascade manner. At this time, there is a reverse voltage drop on the inductor L1, the inductor L2 and the inductor L3. At the same time, the capacitors C1 and C2 are charged by the inductors L3 and C3. In this mode, the diodes D1 and D2 are turned on.
[0035] The third working mode:
[0036] like Figure 4As shown, in this working mode, the inductor current is intermittent at this time, and the average value of the inductor current is less than half of the inductor ripple current. If the switch tube S1 and the switch tube S2 are turned on and off, the working mode has the same flow path as the first and second working modes, but because the inductor current is reduced to zero before the switch tube S1 and the switch tube S2 are turned on again, the switch tube S1, the switch tube S2 and the diode D1, the diode D2, the diode D3, and the diode D4 have no current flowing through them. Therefore, the energy stored in the capacitors C1 and C2 provides electrical energy to the load end and the inductor L4.
[0037] In summary, the inductor and the capacitor cooperate with each other to provide electrical energy to the load, and a higher voltage gain is achieved by using fewer devices.
[0038] The hybrid structure high-boost DC-DC converter of the utility model has a high voltage gain and uses fewer devices, and is suitable for DC conversion scenarios with narrow space, and still has high working efficiency. Among the same type of devices, the input current ripple and voltage stress on the power switch are smaller, and the cost of use is lower.
[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A hybrid structure high boost DC-DC converter, characterized in that: The input source Vs includes an input source Vs, wherein the positive electrode of the input source Vs is connected to one end of the inductor L1 and the collector of the switch tube S2, and the negative electrode is connected to one end of the inductor L2 and the emitter of the switch tube S1; the collector of the switch tube S1 is connected to the negative electrode of the diode D3, the positive electrode of the diode D4 and one end of the inductor L3, and the emitter of the switch tube S2 is connected to the other end of the inductor L2, the negative electrode of the capacitor C1 and the negative electrode of the output terminal Vo; the positive electrode of the diode D3 is connected to the other end of the inductor L1, the positive electrode of the diode D1 and the negative electrode of the capacitor C3; the other end of the inductor L3 is connected to the positive electrode of the capacitor C3 and the negative electrode of the diode D2; the positive electrode of the diode D2 is connected to the negative electrode of the capacitor C2, the negative electrode of the diode D1 and the positive electrode of the capacitor C1; the positive electrode of the capacitor C2 is connected to the negative electrode of the diode D4 and one end of the inductor L4, and the other end of the inductor L4 is connected to the positive electrode of the output terminal Vo.
2. A hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The switch tube S1 and the switch tube S2 are IGBTs with the same duty cycle.
3. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The switch tube S1 and the switch tube S2 are both IGBTs of model IKW40N120CS6XKSA1.
4. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The capacitor C1, capacitor C2 and capacitor C3 are all electrolytic capacitors.
5. The hybrid structure high boost DC-DC converter according to claim 4, characterized in that: The metal foil of the electrolytic capacitor is the positive electrode, the positive electrode is attached with an electrolyte, and the negative electrode of the electrolytic capacitor includes a conductive material and an electrolyte.
6. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The diode D1 and the diode D2 are both Schottky diodes.
7. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The diode D3 and the diode D4 are both Schottky diodes.
8. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The diode D1 and the diode D2 are both Schottky diodes of model STPS745G-TR.
9. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The diode D3 and the diode D4 are both Schottky diodes of STPS745G-TR.
10. The hybrid structure high boost DC-DC converter according to claim 1, characterized in that: The input voltage of the input source Vs is 48V.