High-power-factor high-efficiency hard switch charger circuit
By combining rectification, filtering, and valley filling circuit modules, the problems of insufficient power and slow switching speed in the charger's hard switching circuit are solved, achieving a higher power factor and lower harmonic distortion, thus improving the overall performance of the charger.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-03-20
AI Technical Summary
Existing charger hard-switching circuits suffer from insufficient power and slow switching speed.
The high power factor, high efficiency hard-switching charger circuit design includes a rectifier circuit module, a surge protection circuit module, a first filter circuit module, and a valley-filling circuit module. The power factor is improved and harmonic distortion is reduced through rectification, filtering, and valley-filling circuits. A full-bridge topology circuit module and a transformer are used for energy conversion and control.
It significantly improves the charger's power factor, reduces harmonic distortion, and achieves higher power and better switching performance.
Smart Images
Figure CN224021470U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of charger switching circuit, in particular to a high power factor and high efficiency hard switching charger circuit. BACKGROUND
[0002] Hard switching technology refers to using switching devices in a circuit to achieve efficient power conversion. In a hard switching circuit, the switching device absorbs and releases energy in the circuit, and its on-time, off-time and switching frequency have important influence on the efficiency and performance of the circuit. Hard switching circuit has the advantages of high efficiency of converting electric energy, reducing the loss and heat generation of circuit components, improving the conversion efficiency and power density of the circuit, and is widely used in many power conversion devices and systems.
[0003] The current hard switching circuit of the charger adopts a half topology structure, which has problems of insufficient power and slow switching speed. CONTENT OF THE INVENTION
[0004] The present disclosure provides a high power factor and high efficiency hard switching charger circuit to solve the above technical problems.
[0005] The present disclosure provides a high power factor and high efficiency hard switching charger circuit, comprising a power board and a control board, the power board is connected with a rectifier circuit module, a surge protection circuit module, a first filter circuit module and a valley filling circuit module, the control board is connected with a primary end of a transformer LAB, a secondary end of the transformer LAB is connected with a full-bridge topology circuit module, the full-bridge topology circuit module is connected with the first filter circuit module and the valley filling circuit module, the full-bridge topology circuit module is connected with a primary end of a transformer T3, a secondary end of the transformer T3 is connected with a full-wave rectifier circuit module, the full-wave rectifier circuit module is connected with a second filter circuit module, the second filter circuit module is connected with relays FJ1 and FJ3, the relays FJ1 and FJ3 are used to control the output end of the charger.
[0006] Preferably, the rectifier circuit module comprises a rectifier bridge connected with the control board, the surge protection circuit module comprises a chip U1 and a relay FJH2, one end of the relay FJH2 is connected with the rectifier bridge, the other end is connected with the chip U1, and a thermistor RT1 and a thermistor RT2 are arranged between the relay FJH2 and the rectifier bridge.
[0007] Preferably, the first filter circuit module comprises capacitors C11, C211, C22, C31, C1, C21, C2, C3, the capacitors C11, C211, C22, C31 are connected in parallel with each other, the capacitors C1, C21, C2, C3 are connected in parallel with each other, one end of the capacitors C11, C211, C22, C31 is connected with the relay FJH2, the other end is connected with the capacitors C1, C21, C2, C3, one end of the capacitors C1, C21, C2, C3 is connected with the rectifier bridge.
[0008] Preferably, the valley filling circuit module comprises three groups of diodes, and the three groups of diodes are diodes D141 and D171 connected in parallel with each other, diodes D14 and D17, and diodes D142 and D172, the negative electrodes of the diodes D141 and D171 are connected with the positive electrodes of the capacitors C11, C211, C22, C31 respectively, the positive electrodes of the diodes D141 and D171 are connected with the positive electrodes of the capacitors C1, C21, C2, C3 respectively, the positive electrodes of the diodes D14 and D17 are connected with the negative electrodes of the capacitors C11, C211, C22, C31 respectively, the negative electrodes of the diodes D14 and D17 are connected with the positive electrodes of the capacitors C1, C21, C2, C3 respectively, the diodes D141 and D171 and the diodes D14 and D17 are arranged between the relay FJH2 and the first filter circuit module, the negative electrodes of the diodes D142 and D172 are connected with the negative electrodes of the capacitors C11, C211, C22, C31, the positive electrodes of the diodes D142 and D172 are connected with the negative electrodes of the capacitors C1, C21, C2, C3 respectively, and the diodes D142 and D172 are arranged between the first filter circuit module and the full-bridge topology circuit module.
[0009] Preferably, the full-bridge topology circuit module comprises IGBT tubes GTA, GTB, GTC, GTD, the first pins of the IGBT tubes GTA, GTB, GTC, GTD are connected with the secondary end of the transformer LAB, the second pin of the IGBT tube GTA is connected with the first filter circuit module, the third pin of the IGBT tube GTA is connected with the second pin of the IGBT tube GTB, the third pin of the IGBT tube GTB is connected with the secondary end of the transformer LAB, the second pin of the IGBT tube GTC is connected with the first filter circuit module, the third pin of the IGBT tube GTC is connected with the second pin of the IGBT tube GTD, and the third pin of the IGBT tube GTD is connected with the secondary end of the transformer LAB.
[0010] Preferably, parallel direct-current blocking capacitors C5, C51, C6, C61, C62 are arranged between the full-bridge topology circuit module and the transformer T3.
[0011] Preferably, the transformer T3 is a nanocrystalline transformer.
[0012] Preferably, the full-wave rectifier circuit module comprises diodes DB601, DB602, DB603, DB604, DB605, DB606, DB607, DB608, the diodes DB606, DB605, DB603, DB604 are arranged in parallel with each other, the anode of the diodes DB606, DB605, DB603, DB604 is connected with the fourth pin of the transformer T3, the cathode of the diodes DB606, DB605, DB603, DB604 is connected with the second filter circuit module, the diodes DB601, DB602, DB607, DB608 are arranged in parallel with each other, the anode of the diodes DB601, DB602, DB607, DB608 is connected with the third pin of the transformer T3, the cathode of the diodes DB601, DB602, DB607, DB608 is connected with the second filter circuit module.
[0013] Preferably, the second filter circuit module comprises inductors L5, capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, C122, the full-wave rectifier circuit module is connected with the negative electrode of the charger output end, the fifth pin of the transformer T3 is connected with the negative electrode of the charger output end, the capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, C122 are connected in parallel between the full-wave rectifier circuit module and the fifth pin of the transformer T3, the inductor L5 is arranged between the capacitors C11 and C12.
[0014] Preferably, the system further includes a low-pass filter circuit module connected to the power supply board. The low-pass filter circuit module includes Y capacitors CY14, CY15, and CY16, X capacitors CGZ1, CGZ2, CGZ3, CGZ11, CGZ22, and CGZ33, and a three-phase common-mode inductor LLL1. One end of each Y capacitor (CY14, CY15, or CY16) is grounded. Y capacitor CY14 is connected to the third pin of the three-phase common-mode inductor LLL1, Y capacitor CY15 is connected to the second pin of the three-phase common-mode inductor LLL1, and Y capacitor CY16 is connected to the first pin of the three-phase common-mode inductor LLL1. The two ends of capacitor X, CGZ1, are connected to the first and third pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor X, CGZ2, are connected to the second and third pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor X, CGZ3, are connected to the first and second pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor X, CGZ11, are connected to the fourth and sixth pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor X, CGZ22, are connected to the fourth and fifth pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor X, CGZ33, are connected to the fifth and sixth pins of the three-phase common-mode inductor LLL1, respectively.
[0015] The main beneficial effects of this disclosure are: the present invention improves the power factor and reduces harmonic content through the valley filling circuit module, and the full-bridge topology circuit module is adapted to high-power chargers, resulting in higher power and better switching performance.
[0016] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of a charger circuit according to an embodiment of the present disclosure;
[0019] Figure 2 This is a schematic diagram of a rectifier circuit module according to an embodiment of the present disclosure;
[0020] Figure 3A schematic diagram of a surge protection circuit module in an embodiment of the present disclosure;
[0021] Figure 4 A schematic diagram of a full-bridge topology circuit module in an embodiment of the present disclosure Figure 1 A local enlarged schematic diagram at A in the above figure;
[0022] Figure 5 A schematic diagram of a full-bridge topology circuit module in an embodiment of the present disclosure
[0023] Figure 6 A schematic diagram of a full-wave rectifier circuit module in an embodiment of the present disclosure
[0024] Figure 7 A schematic diagram of a second filter circuit module in an embodiment of the present disclosure
[0025] Figure 8 A schematic diagram of a control board circuit in an embodiment of the present disclosure
[0026] Figure 9 A schematic diagram of a power board circuit in an embodiment of the present disclosure
[0027] Figure 10 A schematic diagram of a low-pass filter circuit module in an embodiment of the present disclosure
[0028] Figure legend: 100 - rectifier circuit module; 200 - surge protection circuit module; 300 - full-bridge topology circuit module; 400 - full-wave rectifier circuit module; 500 - second filter circuit module. DETAILED DESCRIPTION
[0029] The technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure.
[0030] Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present disclosure.
[0031] In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0032] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.
[0033] Embodiment
[0034] As Figures 1-10 shown, the present embodiment provides a high power factor high efficiency hard switching charger circuit, including a power board and a control board, the power board is connected with a rectifier circuit module 100, a surge protection circuit module 200, a first filter circuit module and a valley filling circuit module, the control board is connected with the primary side of transformer LAB, the secondary side of transformer LAB is connected with full-bridge topology circuit module 300, the full-bridge topology circuit module 300 is connected with the first filter circuit module and the valley filling circuit module, the full-bridge topology circuit module 300 is connected with the primary side of transformer T3, the secondary side of transformer T3 is connected with full-wave rectifier circuit module 400, the full-wave rectifier circuit module 400 is connected with second filter circuit module 500, the second filter circuit module 500 is connected with relays FJ1, FJ3, the relays FJ1, FJ3 are used to control the output end of the charger.
[0035] In the present embodiment, the input alternating current is converted into direct current through the rectifier circuit module 100, then the arc appears when the charger is connected to the alternating current is avoided through the surge protection module, the direct current output after the first filter circuit module is more gentle, and the valley filling circuit module is cooperated to greatly increase the conduction angle of the rectifier tube, the input current is changed from sharp pulse to waveform close to sine wave by filling the valley point, the power factor is increased to about 0.9, and the total harmonic distortion is significantly reduced. After passing through the first filter circuit module and the valley filling circuit module, enter the full-bridge topology circuit module 300, the control signal of the control board is isolated and driven through the transformer LAB and then enters the full-bridge topology circuit module 300, the signal output by the control board controls the switch of the full-bridge topology circuit module 300, the waveform output by the full-bridge topology circuit module 300 is boosted or stepped down through the transformer T1, and is isolated and output to the second filter circuit module 500, and finally controlled by the relays FJ1, FJ3.
[0036] Specifically, the rectifier circuit module 100 includes a rectifier bridge connected with the control panel, the anti-surge circuit module 200 includes a chip U1 and a relay FJH2, one end of the relay FJH2 is connected with the rectifier bridge, the other end is connected with the chip U1, and the relay FJH2 is provided with thermistors RT1 and RT2 between the relay FJH2 and the rectifier bridge. The alternating current power input by the power panel is converted into direct current by the rectifier bridge, and the anti-surge circuit module 200 is controlled by the chip U1. In the embodiment, the chip U1 adopts an LM555 chip, the relay FJH2 is controlled by the chip U1, and the relay FJH2 is connected in parallel with the thermistors RT1 and RT2 to prevent electric arc when the charger is connected with AC alternating current.
[0037] Specifically, the first filter circuit module includes capacitors C11, C211, C22, C31, C1, C21, C2 and C3, the capacitors C11, C211 and C22 are connected in parallel with each other, the capacitors C1, C21, C2 and C3 are connected in parallel with each other, one end of the capacitors C11, C211 and C22 is connected with the relay FJH2, the other end is connected with the capacitors C1, C21, C2 and C3, and one end of the capacitors C1, C21, C2 and C3 is connected with the rectifier bridge. The first filter circuit module is composed of eight electrolytic capacitors, and the direct current rectified by the first filter circuit module is more smooth.
[0038] Specifically, the valley filling circuit module includes three groups of diodes, the three groups of diodes are diodes D141 and D171, diodes D14 and D17, and diodes D142 and D172 connected in parallel with each other, the negative poles of the diodes D141 and D171 are connected with the positive poles of the capacitors C11, C211, C22, and C31 respectively, the positive poles of the diodes D141 and D171 are connected with the positive poles of the capacitors C1, C21, C2, and C3 respectively, the positive poles of the diodes D14 and D17 are connected with the negative poles of the capacitors C11, C211, C22, and C31 respectively, the negative poles of the diodes D14 and D17 are connected with the positive poles of the capacitors C1, C21, C2, and C3 respectively, the diodes D141 and D171 and the diodes D14 and D17 are arranged between the relay FJH2 and the first filter circuit module, the negative poles of the diodes D142 and D172 are connected with the negative poles of the capacitors C11, C211, C22, and C31, the positive poles of the diodes D142 and D172 are connected with the negative poles of the capacitors C1, C21, C2, and C3 respectively, and the diodes D142 and D172 are arranged between the first filter circuit module and the full-bridge topology circuit module 300. The valley filling circuit is composed of three groups of diodes beside the electrolytic capacitor, and the "valley filling circuit" is used to greatly increase the conduction angle of the rectifier tube by using the valley filling circuit module behind the rectifier bridge, so that the input current changes from a sharp pulse to a waveform close to a sine wave, the power factor is increased to about 0.9, and the total harmonic distortion is significantly reduced.
[0039] Specifically, the full-bridge topology circuit module 300 includes IGBT tubes GTA, GTB, GTC, and GTD, the first pins of the IGBT tubes GTA, GTB, GTC, and GTD are connected with the secondary end of the transformer LAB, the second pin of the IGBT tube GTA is connected with the first filter circuit module, the third pin of the IGBT tube GTA is connected with the second pin of the IGBT tube GTB, the third pin of the IGBT tube GTB is connected with the secondary end of the transformer LAB, the second pin of the IGBT tube GTC is connected with the first filter circuit module, the third pin of the IGBT tube GTC is connected with the second pin of the IGBT tube GTD, and the third pin of the IGBT tube GTD is connected with the secondary end of the transformer LAB. After the current passes through the first filter circuit module and the valley filling circuit module, it enters the full-bridge topology circuit module 300, the full-bridge circuit module is formed by the IGBT tubes GTA, GTB, GTC, and GTD, the transformer LAB is used to isolate and drive the output signal of the control panel, GTA and GTC form a group, GTB and GTD form a group, and the transformer output signal controls the alternate switching of the two groups.
[0040] Further, the full-bridge topology circuit module 300 and the transformer T3 are provided with parallel direct-current blocking capacitors C5, C51, C6, C61, C62. The alternating current and direct current of the circuit are separated, thereby inhibiting transformer magnetic bias problems.
[0041] The transformer T3 is a nanocrystalline transformer. The nanocrystalline transformer has a higher inductance, a larger power density, a smaller volume, and a larger power than the ferrite transformer.
[0042] Specifically, the full-wave rectifier circuit module 400 includes diodes DB601, DB602, DB603, DB604, DB605, DB606, DB607, and DB608. The diodes DB606, DB605, DB603, and DB604 are connected in parallel with each other. The anode of the diode DB606, DB605, DB603, and DB604 is connected to the fourth pin of the transformer T3. The cathode of the diode DB606, DB605, DB603, and DB604 is connected to the second filter circuit module 100. The diodes DB601, DB602, DB607, and DB608 are connected in parallel with each other. The anode of the diode DB601, DB602, DB607, and DB608 is connected to the third pin of the transformer T3. The cathode of the diode DB601, DB602, DB607, and DB608 is connected to the second filter circuit module 100. The full-wave rectifier circuit module 400 composed of the diodes DB601, DB602, DB603, DB604, DB605, DB606, DB607, and DB608 rectifies the signal output by the transformer T3.
[0043] Specifically, the second filter circuit module 100 includes inductors L5, capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, and C122. The full-wave rectifier circuit module 400 is connected to the negative electrode of the charger output end. The fifth pin of the transformer T3 is connected to the negative electrode of the charger output end. The capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, and C122 are connected in parallel between the full-wave rectifier circuit module 400 and the fifth pin of the transformer T3. The inductor L5 is arranged between the capacitors C11 and C12. The signal rectified by the full-wave rectifier circuit module 400 is filtered by the inductor L5 and the plurality of electrolytic capacitors, and finally output by the relays FJ1 and FJ3.
[0044] Further, a low-pass filter circuit module is further included, the low-pass filter circuit module is connected with the power panel, the low-pass filter circuit module includes Y capacitor CY14, CY15, CY16, X capacitor CGZ1, CGZ2, CGZ3, CGZ11, CGZ22, CGZ33 and three-phase common mode inductance LLL1, one end of Y capacitor CY14, CY15, CY16 is grounded, Y capacitor CY14 is connected with the third pin of three-phase common mode inductance LLL1, Y capacitor CY15 is connected with the second pin of three-phase common mode inductance LLL1, Y capacitor CY16 is connected with the first pin of three-phase common mode inductance LLL1, two ends of X capacitor CGZ1 are connected with the first and third pins of three-phase common mode inductance LLL1 respectively, two ends of X capacitor CGZ2 are connected with the second and third pins of three-phase common mode inductance LLL1 respectively, two ends of X capacitor CGZ3 are connected with the first and second pins of three-phase common mode inductance LLL1 respectively, two ends of X capacitor CGZ11 are connected with the fourth and sixth pins of three-phase common mode inductance LLL1 respectively, two ends of X capacitor CGZ22 are connected with the fourth and fifth pins of three-phase common mode inductance LLL1 respectively, two ends of X capacitor CGZ33 are connected with the fifth and sixth pins of three-phase common mode inductance LLL1 respectively.
[0045] The working principle of the utility model discloses: power is input through the power panel, converts alternating current into direct current through the rectifier bridge, the valley fill circuit module is passive PFC circuit, makes it with input voltage waveform synchronization, improves power factor, reduces harmonic content, after the valley fill circuit module and the first filter circuit module, through full bridge topology circuit module 300, the control signal of control panel is driven full bridge topology circuit module 300 alternate switch through transformer LAB isolation, control signal is separated after alternating current and direct current through the direct current separation capacitor, through transformer T3 carries out voltage step-up or step-down, enters the second filter circuit module 500 filter, finally through relay FJ1, FJ3 control output.
[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and 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 present disclosure.
Claims
1. A high power factor, high efficiency hard-switching charger circuit, characterized in that, include: The system includes a power board and a control board. The power board is connected to a rectifier circuit module, a surge protection circuit module, a first filter circuit module, and a valley-filling circuit module. The control board is connected to the primary side of transformer LAB. The secondary side of transformer LAB is connected to a full-bridge topology circuit module, which is connected to the first filter circuit module and the valley-filling circuit module. The full-bridge topology circuit module is connected to the primary side of transformer T3. The secondary side of transformer T3 is connected to a full-wave rectifier circuit module, which is connected to a second filter circuit module. The second filter circuit module is connected to relays FJ1 and FJ3, which are used to control the output of the charger.
2. The high power factor, high efficiency hard-switching charger circuit according to claim 1, characterized in that, The rectifier circuit module includes a rectifier bridge connected to the control board. The surge protection circuit module includes a chip U1 and a relay FJH2. One end of the relay FJH2 is connected to the rectifier bridge, and the other end is connected to the chip U1. Thermistors RT1 and RT2 are provided between the relay FJH2 and the rectifier bridge.
3. The high power factor, high efficiency hard-switching charger circuit according to claim 2, characterized in that, The first filter circuit module includes capacitors C11, C211, C22, C31, C1, C21, C2, and C3. Capacitors C11, C211, C22, and C31 are connected in parallel, and capacitors C1, C21, C2, and C3 are also connected in parallel. One end of capacitors C11, C211, C22, and C31 is connected to the relay FJH2, and the other end is connected to capacitors C1, C21, C2, and C3. One end of capacitors C1, C21, C2, and C3 is connected to the rectifier bridge.
4. The high power factor, high efficiency hard-switching charger circuit according to claim 3, characterized in that, The valley-filling circuit module includes three sets of diodes: diodes D141 and D171, diodes D14 and D17, and diodes D142 and D172 connected in parallel. The negative terminals of diodes D141 and D171 are connected to the positive terminals of capacitors C11, C211, C22, and C3, respectively. The positive terminals of diodes D141 and D171 are connected to the positive terminals of capacitors C1, C21, C2, and C3, respectively. The positive terminals of diodes D141 and D171 are connected to the negative terminals of capacitors C11, C211, C22, and C3, respectively. The negative terminals of diodes D14 and D17 are connected to the positive terminals of capacitors C1, C21, C2, and C3, respectively. Diodes D141 and D171, and diodes D14 and D17 are disposed between relay FJH2 and the first filter circuit module. The negative terminals of diodes D142 and D172 are connected to the negative terminals of capacitors C11, C211, C22, and C31, respectively. The positive terminals of diodes D142 and D172 are connected to the negative terminals of capacitors C1, C21, C2, and C3, respectively. Diodes D142 and D172 are disposed between the first filter circuit module and the full-bridge topology circuit module.
5. The high power factor, high efficiency hard-switching charger circuit according to claim 1, characterized in that, The full-bridge topology circuit module includes IGBTs GTA, GTB, GTC, and GTD. The first pins of IGBTs GTA, GTB, GTC, and GTD are connected to the secondary side of the transformer LAB. The second pin of IGBT GTA is connected to the first filter circuit module. The third pin of IGBT GTA is connected to the second pin of IGBT GTB. The third pin of IGBT GTB is connected to the secondary side of the transformer LAB. The second pin of IGBT GTC is connected to the first filter circuit module. The third pin of IGBT GTC is connected to the second pin of IGBT GTD. The third pin of IGBT GTD is connected to the secondary side of the transformer LAB.
6. The high power factor, high efficiency hard-switching charger circuit according to claim 5, characterized in that, A parallel DC blocking capacitor C5, C51, C6, C61, and C62 is provided between the full-bridge topology circuit module and the transformer T3.
7. The high power factor, high efficiency hard-switching charger circuit according to claim 1, characterized in that, The transformer T3 is a nanocrystalline transformer.
8. The high power factor, high efficiency hard-switching charger circuit according to claim 1, characterized in that, The full-wave rectifier circuit module includes diodes DB601, DB602, DB603, DB604, DB605, DB606, DB607, and DB608. Diodes DB606, DB605, DB603, and DB604 are connected in parallel. The positive terminals of diodes DB606, DB605, DB603, and DB604 are connected to the fourth pin of transformer T3, and the negative terminals of diodes DB606, DB605, DB603, and DB604 are connected to the second filter circuit module. Diodes DB601, DB602, DB607, and DB608 are connected in parallel. The positive terminals of diodes DB601, DB602, DB607, and DB608 are connected to the third pin of transformer T3, and the negative terminals of diodes DB601, DB602, DB607, and DB608 are connected to the second filter circuit module.
9. A high power factor, high efficiency hard-switching charger circuit according to claim 8, characterized in that, The second filter circuit module includes an inductor L5 and capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, and C122. The full-wave rectifier circuit module is connected to the negative terminal of the charger output. The fifth pin of the transformer T3 is connected to the negative terminal of the charger output. The capacitors C151, C113, C112, C11, C121, C13, C142, C12, C14, C141, and C122 are connected in parallel between the full-wave rectifier circuit module and the fifth pin of the transformer T3. The inductor L5 is positioned between capacitors C11 and C12.
10. A high power factor, high efficiency hard-switching charger circuit according to claim 1, characterized in that, It also includes a low-pass filter circuit module, which is connected to the power supply board. The low-pass filter circuit module includes Y capacitors CY14, CY15, and CY16, X capacitors CGZ1, CGZ2, CGZ3, CGZ11, CGZ22, and CGZ33, and a three-phase common-mode inductor LLL1. One end of each Y capacitor (CY14, CY15, and CY16) is grounded. Y capacitor CY14 is connected to the third pin of the three-phase common-mode inductor LLL1, Y capacitor CY15 is connected to the second pin of the three-phase common-mode inductor LLL1, and Y capacitor CY16 is connected to the first pin of the three-phase common-mode inductor LLL1. The X capacitor... The two ends of capacitor CGZ1 are connected to the first and third pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor CGZ2 are connected to the second and third pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor CGZ3 are connected to the first and second pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor CGZ11 are connected to the fourth and sixth pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor CGZ22 are connected to the fourth and fifth pins of the three-phase common-mode inductor LLL1, respectively. The two ends of capacitor CGZ33 are connected to the fifth and sixth pins of the three-phase common-mode inductor LLL1, respectively.