Novel high-power PFC converter
By adopting a novel high-power PFC converter structure and control method, the problems of traditional PFC converters, such as numerous components, complex control, and large inductance, have been solved, achieving miniaturization, low cost, and high-efficiency power conversion.
Patent Information
- Application Number
- CN202520129965.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Traditional PFC converters suffer from problems such as a large number of components, complex control technology, and low converter power due to large circulating current. Furthermore, the large auxiliary inductor increases the size and cost of the converter.
A novel high-power PFC converter structure is adopted, including an input source, inductor, capacitor and switching transistor. By selectively controlling the conduction of the switching transistor, voltage regulation and soft switching are achieved, reducing the number of components, adapting to CCM control methods, and optimizing the power factor correction effect.
This results in a converter with a simple structure, low cost, high power, and small inductor size, capable of adapting to a wide range of AC cycles, reducing switching losses, and improving power quality and efficiency.
Smart Images
Figure CN223758179U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to power electronics technical field relates to a new type high power PFC converter. BACKGROUND
[0002] Greatly improving energy utilization rate is the challenge problem of realizing "carbon peak" and "carbon neutralization" target in China, power electronics technology can greatly improve the utilization efficiency of electric energy, accurately acts on the electric energy conversion link, greatly reduces the loss in the process of electric energy transmission and use, is the key technology of realizing efficient electric energy conversion, with the accurate regulation and control of electric energy, it can make electric energy in different electrical equipment, different power consumption scene, can be efficiently used in the most adaptive form, thereby avoiding the energy consumption caused by improper conversion, poor adaptation.
[0003] In order to guarantee electric energy quality in all directions, power factor correction technology is also introduced into power system. In daily power consumption scene, harmonic current interferes with the stable operation of power grid, makes the electric energy transmission efficiency greatly discounted, leads to a large amount of electric energy is wasted, the introduction of power factor correction technology can effectively reduce the pollution of harmonic current to power grid, so that the power supply quality of power grid can be steadily improved.
[0004] The traditional PFC converter topology, although their structure and control are relatively simple, can easily realize power factor correction and other advantages, but with the pursuit of miniaturization and low cost of electrical equipment rising, the traditional PFC converter needs to configure larger auxiliary inductance, which cannot meet the use requirement, and the converter not only has the problem of large auxiliary inductance, but also has the problem of large circulating current, which leads to the increase of the overall size and cost of the converter.
[0005] Therefore, a new type high power PFC converter is proposed. Utility model content
[0006] The utility model aims at providing a new type high power PFC converter to overcome the defects of many devices, complex control technology and low power of the converter caused by large circulating current in prior art.
[0007] In order to achieve the above object, the utility model adopts the following technical scheme to realize it:
[0008] A new type high power PFC converter, including input source Vg, inductance L, inductance Lr1, inductance Lr2, inductance Lo, capacitor Cr, capacitor Co, switch tube S1, switch tube S2, switch tube S3, switch tube S4, switch tube Saux, load R;
[0009] The one end of the input source Vg is connected with one end of the inductor L, the other end of the inductor L is connected with one end of the inductor Lr1 and one end of the inductor Lr2, the other end of the inductor Lr1 is connected with the source electrode of the switch tube S1 and one end of the capacitor Cr, the drain electrode of the switch tube S1 is connected with the drain electrode of the switch tube S3 and one end of the inductor Lo, the other end of the inductor Lo is connected with one end of the capacitor Co and the positive electrode of the load R; the other end of the capacitor Cr is connected with the drain electrode of the switch tube Saux, the source electrode of the switch tube Saux is connected with the other end of the inductor Lr2, the other end of the inductor Lr2 is also connected with the drain electrode of the switch tube S2, the source electrode of the switch tube S2 is connected with the source electrode of the switch tube S4, the other end of the capacitor Co and the negative electrode of the load R, the drain electrode of the switch tube S4 is connected with the other end of the input source Vg and the source electrode of the switch tube S3.
[0010] Further, the source electrode and the drain electrode of the switch tube S1 are also connected with two ends of the diode D1 and the capacitor C1 respectively.
[0011] Further, the source electrode and the drain electrode of the switch tube S2 are also connected with two ends of the diode D2 and the capacitor C2 respectively.
[0012] Further, the source electrode and the drain electrode of the switch tube S3 are also connected with two ends of the diode D3 and the capacitor C3 respectively.
[0013] Further, the source electrode and the drain electrode of the switch tube S4 are also connected with two ends of the diode D4 and the capacitor C4 respectively.
[0014] Further, the source electrode and the drain electrode of the switch tube Saux are also connected with two ends of the diode Daux and the capacitor Caux respectively.
[0015] Further, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4 and the switch tube Saux all adopt MOSFET switch tubes.
[0016] Further, the switch tube S1, the switch tube S2, the switch tube S3, the switch tube S4 and the switch tube Saux all adopt MOSFET switch tubes with the model of LMG3425R050.
[0017] Further, the inductor L, the inductor Lr1, the inductor Lr2 and the inductor Lo are all soft magnetic ferrite materials.
[0018] Further, the capacitor Cr and the capacitor Co are all electrolytic capacitors.
[0019] Compared with the prior art, the utility model has the following beneficial technical effects:
[0020] The utility model provides a novel high -power PFC converter, including input source Vg, inductance L, inductance Lr1, inductance Lr2, inductance Lo, capacitor Cr, capacitor Co, switch tube S1, switch tube S2, switch tube S3, switch tube S4, switch tube Saux, load R, input source Vg one end connects one end of inductance L, the other end of inductance L connects one end of inductance Lr1, one end of inductance Lr2, the other end of inductance Lr1 connects the source electrode of switch tube S1, one end of capacitor Cr, the drain electrode of switch tube S1 connects the drain electrode of switch tube S3, inductance Lo, the other end of inductance Lo connects one end of capacitor Co, the positive pole of load R, the other end of capacitor Cr connects the drain electrode of switch tube Saux, the source electrode of switch tube Saux connects the other end of inductance Lr2, the other end of inductance Lr2 still connects the drain electrode of switch tube S2, the source electrode of switch tube S2 connects the source electrode of switch tube S4, the other end of capacitor Co, the negative pole of load R, the drain electrode of switch tube S4 connects the other end of input source Vg, the source electrode of switch tube S3, the high -power PFC converter structure simple of utility model proposes, the quantity of component parts is few, reduces the cost, can reduce the size of magnetic component, improves the power of converter, still can adapt CCM (continuous conduction mode) Control method, under CCM mode, inductance current is always continuous, can reduce current ripple, optimize power factor correction effect, improve electric energy quality. When realizing soft switch of switch tube opening and shutting down, reduce the loss of switch tube, improve the efficiency of converter, and can be applied to the FET (field effect transistor) in wide range AC cycle. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is high -power PFC converter topology graph in the utility model embodiment.
[0022] Figure 2 It is high -power PFC converter first kind of working state schematic view in the utility model embodiment.
[0023] Figure 3 It is high -power PFC converter second kind of working state schematic view in the utility model embodiment.
[0024] Figure 4 It is high -power PFC converter third kind of working state schematic view in the utility model embodiment.
[0025] Figure 5 It is high -power PFC converter fourth kind of working state schematic view in the utility model embodiment.
[0026] Figure 6 It is high -power PFC converter fifth kind of working state schematic view in the utility model embodiment.
[0027] Figure 7 The sixth working state schematic view of the high-power PFC converter in the embodiment of the utility model.
[0028] Figure 8 The seventh working state schematic view of the high-power PFC converter in the embodiment of the utility model.
[0029] Figure 9 The eighth working state schematic view of the high-power PFC converter in the embodiment of the utility model.
[0030] Figure 10 The ninth working state schematic view of the high-power PFC converter in the embodiment of the utility model. DETAILED DESCRIPTION
[0031] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination 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 the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.
[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the utility model 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 the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0033] As Figure 1 shown, the utility model provides a novel high-power PFC converter, including input source Vg, inductance L, inductance Lr1, inductance Lr2, inductance Lo, capacitor Cr, capacitor Co, switch tube S1, switch tube S2, switch tube S3, switch tube S4, switch tube Saux, load R;
[0034] Input source Vg is connected to one end of inductor L, the other end of inductor L is connected to one end of inductor Lr1 and one end of inductor Lr2, the other end of inductor Lr1 is connected to the source of switch tube S1 and one end of capacitor Cr, the drain of switch tube S1 is connected to the drain of switch tube S3 and one end of inductor Lo, the other end of inductor Lo is connected to one end of capacitor Co and the positive pole of load R; the other end of capacitor Cr is connected to the drain of switch tube Saux, the source of switch tube Saux is connected to the other end of inductor Lr2, the other end of inductor Lr2 is also connected to the drain of switch tube S2, the source of switch tube S2 is connected to the source of switch tube S4, the other end of capacitor Co and the negative pole of load R, the drain of switch tube S4 is connected to the other end of input source Vg and the source of switch tube S3. Wherein, switch tube Saux refers to a bidirectional auxiliary switch.
[0035] Preferably, the source and the drain of switch tube S1 are also connected with the two ends of diode D1 and capacitor C1 respectively.
[0036] Preferably, the source and the drain of switch tube S2 are also connected with the two ends of diode D2 and capacitor C2 respectively.
[0037] Preferably, the source and the drain of switch tube S3 are also connected with the two ends of diode D3 and capacitor C3 respectively.
[0038] Preferably, the source and the drain of switch tube S4 are also connected with the two ends of diode D4 and capacitor C4 respectively.
[0039] Preferably, the source and the drain of switch tube Saux are also connected with the two ends of diode Daux and capacitor Caux respectively.
[0040] Preferably, the switch tube S1, switch tube S2, switch tube S3, switch tube S4 and switch tube Saux all adopt MOSFET switch tube.
[0041] Preferably, the switch tube S1, switch tube S2, switch tube S3, switch tube S4 and switch tube Saux all adopt MOSFET switch tube with model LMG3425R050.
[0042] Preferably, the inductor L, inductor Lr1, inductor Lr2 and inductor Lo are all soft magnetic ferrite material.
[0043] The new high-power PFC converter has nine working modes, as shown in the following table: Figures 2 to 10 The solid line represents the required elements in the current working state, and the dotted line represents not joining the current working state. The positive pole of input source Vg is connected to one end of inductor L.
[0044] The first working mode:
[0045] AsFigure 2 As shown, in this operating mode, switches S2 and S4 are closed, the input source Vg charges inductors L and Lr2 through switches S2 and S4, capacitor Co releases energy to load R, switches S1, S3, and Saux are open, and capacitor Cr and inductor Lr1 do not work.
[0046] In this mode, there are two loops. Loop 1: When switches S2 and S4 are closed, current flows from the positive terminal of input source Vg through inductor L, then from the positive terminal of inductor Lr2 to the negative terminal of inductor Lr2, and then through switches S2 and S4 to the negative terminal of input source Vg. In this loop, input source Vg releases energy to inductors L and Lr2, charging them. Loop 2: Current flows from the positive terminal of capacitor Co into the positive terminal of load R, then from the negative terminal of load R into the negative terminal of capacitor Co. In this loop, capacitor Co releases energy to load R.
[0047] The second working mode:
[0048] like Figure 3 As shown, in this operating mode, switch S4 is closed, while switches S1 and S2 are open. When switch S2 is open, inductor L charges capacitor Co through inductor Lr1 and capacitor C1 via switch S4. Simultaneously, inductors L and Lr2 charge capacitor C2 through switch S4. Capacitor Cr, inductor Lo, and switches S3 and Saux are inactive in this operating mode.
[0049] In this mode, there are two loops. Loop 1: When switch S4 is closed, current flows from the positive terminal of input source Vg through inductor L and then into one end of inductor Lr1. From the other end of inductor Lr1, it flows through capacitor C1 and inductor Lo connected to switch S1 to the positive terminal of capacitor Co. Then, it flows out from the negative terminal of capacitor Co and through switch S4 to the negative terminal of input source Vg. In this loop, inductor L and capacitor C1 release energy to inductor Lo and capacitor Co, charging them. Loop 2: Current flows from the positive terminal of input source Vg through inductor L and then into one end of inductor Lr2. From the other end of inductor Lr2, it flows into one end of capacitor C2 connected to switch S2. From the other end of capacitor C2, it flows through switch S4 to the negative terminal of input source Vg. In this loop, inductor L and inductor L2 release energy to capacitor C2, charging it.
[0050] The third working mode:
[0051] like Figure 4As shown, in this operating mode, switches S1 and S4 are closed, while switches S2 and Saux are open. When capacitor C1 connected to switch S1 discharges to 0, diode D1 conducts, achieving zero-voltage turn-on of switch S1. Inductors Lr1 and Lr2, along with capacitor Cr, form a resonant circuit. Inductor Lr2 releases energy to capacitor Cr through diode Daux connected to switch Saux, charging capacitor Cr. Inductor Lo and switch S3 are not in operation in this mode.
[0052] In this mode, there are three loops. Loop 1: Current flows from the positive terminal of input source Vg through inductor L and then into one end of inductor Lr1. From the other end of Lr1, it flows through diode D1 connected to switch S1 and inductor Lo into the positive terminal of capacitor Co. Then, it flows out from the negative terminal of capacitor Co and through switch S4 to the negative terminal of input source Vg. Loop 2: Current flows from the positive terminal of input source Vg through inductor L and then into one end of inductor Lr2. From the other end of Lr2, it flows into one end of capacitor C2 connected to switch S2. Then, it flows from the other end of capacitor C2 through switch S4 to the negative terminal of input source Vg. In this loop, inductors L and L2 release energy to capacitor C2, charging capacitor C2. Loop 3: Current flows from one end of inductor Lr2 through diode Daux into one end of capacitor Cr. Then, from the other end of capacitor Cr, it flows through inductor Lr1 to the other end of inductor Lr2. In this loop, inductor Lr2 releases energy to capacitor Cr, charging capacitor Cr.
[0053] The fourth working mode:
[0054] like Figure 5 As shown, in this operating mode, switches S1 and S4 are closed, inductor Lr2 no longer has current flowing through it, and the current through inductors L and Lr1 continues to decrease. Inductors L and Lr1 are in a discharging state. Inductors Lr2, Lo, capacitor Cr, and switches S2, S3, and Saux are in a non-operating state in this operating mode.
[0055] In this mode, there is a loop. Loop 1: the current flows from the positive terminal of the input source Vg through the inductor L and then into one end of the inductor Lr1. Then, from the other end of the inductor Lr1, it flows through the switch S1 and the inductor Lo into the positive terminal of the capacitor Co. Then, it flows out from the negative terminal of the capacitor Co and through the switch S4 to the negative terminal of the input source Vg.
[0056] The fifth working mode:
[0057] like Figure 6As shown, in this operating mode, switches S1, S4, and Saux are closed, inductor Lr2 is in a charging state, inductors Lr1 and Lr2 form a resonant circuit, capacitor Cr is in a discharging state, and capacitor Cr releases energy through inductors Lr1 and Lr2. In this operating mode, switches S2 and S3 are not in operation.
[0058] In this mode, there are two loops. Loop 1: Current flows from the positive terminal of the input source Vg through inductor L and then into one end of inductor Lr1. From the other end of inductor Lr1, it flows through switch S1 and inductor Lo into the positive terminal of capacitor Co. From the negative terminal of capacitor Co, it flows out through switch S4 and back to the negative terminal of the input source Vg. Loop 2: Current flows from one end of inductor Lr2 through switch Saux into one end of capacitor Cr. From the other end of capacitor Cr, it flows through inductor Lr1 to the other end of inductor Lr2. In this loop, capacitor Cr releases energy to inductors Lr1 and Lr2, and capacitor Cr discharges.
[0059] The sixth working mode:
[0060] like Figure 7 As shown, in this operating mode, switch S4 is closed, and switches S1 and S2 are open. Inductor Lr2 is in a discharging state, and capacitor Co is in a charging state. When capacitor Co is fully discharged, switches S1 and Saux are turned off simultaneously. Inductor Lr1 releases energy to capacitor C2 through diode D1 connected to switch S1, and capacitor C2 is charged.
[0061] In this mode, there are two loops. Loop 1: Current flows from the positive terminal of the input source Vg through inductor L and then into one end of inductor Lr1. From the other end of Lr1, it flows through switch S1 and inductor Lo into the positive terminal of capacitor Co, and then flows out from the negative terminal of capacitor Co through switch S4 back to the negative terminal of the input source Vg. Loop 2: Current flows from one end of inductor Lr1 through diode D2 and inductor Lo to the positive terminal of capacitor Co, and then from the negative terminal of capacitor Co through capacitor C2 and inductor Lr2 back to the other end of inductor Lr1. In this loop, inductor Lr1 releases energy to capacitor C2, and capacitor C2 is charged.
[0062] The seventh working mode:
[0063] like Figure 8As shown, in this operating mode, switches S2 and S4 are closed, and switch S1 is open. When switch S2 is closed, inductor Lr2 achieves zero-voltage turn-on of switch S2. Inductors Lr1 and Lr2 release energy to inductor Lo and capacitor Co through diode D1 connected to switch S1, and inductor Lo and capacitor Co are charged. At the same time, inductor Lr1 releases energy to inductor Lr2. Inductor Lo, capacitor Cr, switch S3, and switch Saux are in a non-operating state in this operating mode.
[0064] In this mode, there are two loops. Loop 1: Current flows from the positive terminal of the input source Vg through inductor L and then into one end of inductor Lr1. From the other end of Lr1, it flows through diode D1 connected to switch S1 and inductor Lo into the positive terminal of capacitor Co. Then, it flows out from the negative terminal of capacitor Co and through switch S4 back to the negative terminal of the input source Vg. Loop 2: Current flows from one end of inductor Lr1 through diode D1 and inductor Lo to the positive terminal of capacitor Co. Then, it flows from the negative terminal of capacitor Co through switch S2 and inductor Lr2 back to the other end of inductor Lr1. In this loop, inductor Lr1 releases energy to inductor Lr2.
[0065] The eighth working mode:
[0066] like Figure 9 As shown, in this operating mode, switches S2 and S4 are closed, and switch S1 is open. When diode D2 connected to switch S2 is reverse biased, inductors Lr1, Lr2, and capacitor C1 together form a resonant circuit. Inductor Lr1 releases energy to capacitor C1 through switch S4, and capacitor C1 is charged. Inductors Lo, capacitor Cr, switch S3, and switch Saux are in a non-operating state in this operating mode.
[0067] In this mode, there are two loops. Loop 1: Current flows from the positive terminal of input source Vg through inductor L and into one end of inductor Lr1. Then, from the other end of inductor Lr1, it flows through capacitor C1 and inductor Lo into the positive terminal of capacitor Co. Then, it flows out from the negative terminal of capacitor Co and through switch S4 to the negative terminal of input source Vg. In this loop, inductor Lr1 releases energy to capacitor C1. Loop 2: Current flows from the positive terminal of input source Vg through inductor L and into one end of inductor Lr2. Then, from the other end of inductor Lr2, it flows through switch S2 and switch S4 to the negative terminal of input source Vg.
[0068] The ninth working mode:
[0069] like Figure 10As shown, in this mode, switch S2 and switch S4 are closed, switch Saux is open, inductor Lr1 and inductor Lr2 are in discharging state, capacitor Cr is in charging state, capacitor Co and inductor Lo are in discharging state, switch S1 and switch S3 are in non-working state in this mode.
[0070] In this mode, there are two loops, loop one: current flows from the positive pole of input source Vg through inductor L, then flows into one end of inductor Lr2, and then flows from the other end of inductor Lr2 through switch S2 and switch S4 to the negative pole of input source Vg. Loop two: current flows from one end of inductor Lr2 through diode Daux into one end of capacitor Cr, and then flows from the other end of capacitor Cr through inductor Lr1 to the other end of inductor Lr2. In this loop, inductor Lr2 releases energy to capacitor Cr, and charges capacitor Cr.
[0071] As shown above, by selectively controlling each switch and making it conductive, the voltage regulation process is realized through capacitors and inductors.
[0072] The utility model has improved the ability of converter power factor, applicable to wider range of soft switch technology, required component is less, low in cost, effectively improve switching frequency, reduce input inductance size, improved the overall power of converter.
[0073] The above content is only for illustrating the technical thought of the utility model, and cannot limit the protection scope of the utility model, and any modification made on the basis of the technical scheme according to the technical thought of the utility model falls into the protection scope of the utility model claim.
Claims
1. A novel high power PFC converter characterized in that, The input source Vg, the inductor L, the inductor Lr1, the inductor Lr2, the inductor Lo, the capacitor Cr, the capacitor Co, the switch S1, the switch S2, the switch S3, the switch S4, the switch Saux, and the load R are included. One end of the input source Vg is connected to one end of the inductor L, and the other end of the inductor L is connected to one end of the inductor Lr1 and one end of the inductor Lr2. The other end of the inductor Lr1 is connected to the source of the switch S1 and one end of the capacitor Cr. The drain of the switch S1 is connected to the drain of the switch S3 and one end of the inductor Lo. The other end of the inductor Lo is connected to one end of the capacitor Co and the positive electrode of the load R. The other end of the capacitor Cr is connected to the drain of the switch Saux, and the source of the switch Saux is connected to the other end of the inductor Lr2. The other end of the inductor Lr2 is also connected to the drain of the switch S2. The source of the switch S2 is connected to the source of the switch S4, the other end of the capacitor Co, and the negative electrode of the load R. The drain of the switch S4 is connected to the other end of the input source Vg and the source of the switch S3.
2. A novel high power PFC converter as claimed in claim 1, wherein, The source and the drain of the switch S1 are also connected to the two ends of the diode D1 and the capacitor C1, respectively.
3. A novel high power PFC converter as claimed in claim 1, wherein, The source and the drain of the switch S2 are also connected to the two ends of the diode D2 and the capacitor C2, respectively.
4. A novel high power PFC converter as claimed in claim 1, wherein, The source and the drain of the switch S3 are also connected to the two ends of the diode D3 and the capacitor C3, respectively.
5. A novel high power PFC converter as claimed in claim 1, wherein, The source and the drain of the switch S4 are also connected to the two ends of the diode D4 and the capacitor C4, respectively.
6. A novel high power PFC converter as claimed in claim 1, characterized in that, The source and the drain of the switch Saux are also connected to the two ends of the diode Daux and the capacitor Caux, respectively.
7. A novel high power PFC converter as claimed in claim 1, wherein, The switches S1, S2, S3, S4, and Saux are all MOSFET switches.
8. A novel high power PFC converter as claimed in claim 7, characterized in that, The switches S1, S2, S3, S4, and Saux are all MOSFET switches with the model number LMG3425R050.
9. A novel high power PFC converter as claimed in claim 1, characterized in that, The inductors L, Lr1, Lr2, and Lo are all soft magnetic ferrite materials.
10. A novel high power PFC converter as claimed in claim 1, characterized in that, The capacitors Cr and Co are both electrolytic capacitors.