Vehicle-mounted charger, control method thereof and vehicle

Abstract

According to the vehicle-mounted charger, the control method thereof and the vehicle, the vehicle-mounted charger comprises a primary side circuit, a center tapped transformer and a secondary side circuit, and the primary side circuit comprises a half-bridge unit and an absorption half-bridge unit; the two input ends of the half-bridge unit and the two input ends of the absorption half-bridge unit are connected with the two ends of a primary winding of the center-tapped transformer respectively, and the output end of the half-bridge unit and the output end of the absorption half-bridge unit are connected with a first bus. The two input ends of the secondary circuit are connected with the two ends of a secondary winding of the center tapped transformer respectively, and the output end of the secondary circuit is used for being connected with a load. According to the scheme, only single-stage conversion from alternating current to direct current is achieved, power factor correction and the primary side of high-voltage alternating current are integrated through single-stage topology, a rectifier bridge arm, a power factor correction inductor and an electrolytic capacitor needed by power factor correction are removed, the board occupation area and the size of the vehicle-mounted charger can be reduced, the cost of the vehicle-mounted charger is reduced, and the vehicle-mounted charger is suitable for popularization and application. And the electric energy conversion efficiency of the vehicle-mounted charger is improved.

Description

Technical Field

[0001] This application relates to the field of chargers, and more particularly to an on-board charger and its control method, and a vehicle. Background Technology

[0002] An on-board charger (OBC) is a core power electronic component of new energy vehicles. An on-board charger can convert AC power from an external power source (grid) into high-voltage DC power to charge the power battery of a new energy vehicle.

[0003] Traditional on-board chargers include two stages of conversion: the first stage converts AC power to DC power, and the second stage converts the DC power provided by the first stage into voltage and current suitable for battery charging.

[0004] The two-stage conversion of the on-board charger includes not only PFC inductors and bus electrolytic capacitors, but also bridge arms with a large number of tubes, resulting in the on-board charger being large in size, inefficient, and expensive. Summary of the Invention

[0005] The on-board charger and its control method, as well as the vehicle provided in this application embodiment, are used to reduce the size of the on-board charger, improve efficiency, and reduce costs.

[0006] In a first aspect, embodiments of this application provide an on-board charger, comprising:

[0007] The circuit consists of a primary circuit, a center-tapped transformer, and a secondary circuit; the first busbar of the primary circuit is connected to the negative terminal of the AC power supply, and the second busbar is connected to the positive terminal of the AC power supply; the center tap of the center-tapped transformer is connected to the second busbar.

[0008] The primary-side circuit includes:

[0009] A half-bridge unit, wherein the two input terminals of the half-bridge unit are respectively connected to the two ends of the primary winding of the center tap transformer, and the output terminal of the half-bridge unit is connected to the first busbar;

[0010] An absorption half-bridge unit is provided, wherein the two input terminals of the absorption half-bridge unit are respectively connected to the two ends of the primary winding of the center tap transformer, and the output terminal of the half-bridge unit is connected to the first busbar.

[0011] The two input terminals of the secondary circuit are respectively connected to the two ends of the secondary winding of the center tap transformer, and the output terminal of the secondary circuit is used to connect the load.

[0012] Optionally, the half-bridge unit includes: a first bridge arm and a second bridge arm;

[0013] The first bridge arm is connected between the first input terminal and the first output terminal of the half-bridge unit;

[0014] The second bridge arm is connected between the second input and the output of the half-bridge unit.

[0015] Optionally, the first bridge arm includes: a first switching transistor and a second switching transistor;

[0016] The first end of the first switching transistor is connected to the first input terminal of the half-bridge unit, the second end of the first switching transistor is connected to the second end of the second switching transistor, and the first end of the second switching transistor is connected to the output terminal of the half-bridge unit.

[0017] The second bridge arm includes a third switch and a fourth switch;

[0018] The first end of the third switch is connected to the second input end of the half-bridge unit, the second end of the third switch is connected to the second end of the fourth switch, and the first end of the fourth switch is connected to the output end of the half-bridge unit.

[0019] Optionally, the absorbing half-bridge unit includes: a third bridge arm and a fourth bridge arm;

[0020] The third bridge arm is connected between the first input terminal and the output terminal of the absorption half-bridge unit;

[0021] The fourth bridge arm is connected between the second input and the output of the absorption half-bridge unit.

[0022] Optionally, the third bridge arm includes: a fifth switch and a sixth switch;

[0023] The first end of the fifth switch is connected to the first input end of the absorption half-bridge unit, the second end of the fifth switch is connected to the second end of the sixth switch, and the first end of the sixth switch is connected to the output end of the absorption half-bridge unit.

[0024] The fourth bridge arm includes: a seventh switch and an eighth switch;

[0025] The first end of the seventh switch is connected to the second input end of the absorption half-bridge unit, the second end of the seventh switch is connected to the second end of the eighth switch, and the first end of the eighth switch (clamp4) is connected to the output end of the absorption half-bridge unit.

[0026] Optionally, the third bridge arm includes: a first resistor;

[0027] The first resistor is connected between the first input terminal and the output terminal of the absorption half-bridge unit;

[0028] The fourth bridge arm includes: a second resistor;

[0029] The second resistor is connected between the second input terminal and the output terminal of the absorption half-bridge unit.

[0030] Optionally, the absorption half-bridge unit further includes: a first absorption capacitor and a second absorption capacitor;

[0031] The first absorption capacitor is connected between the first input terminal of the absorption half-bridge unit and the fifth switching transistor;

[0032] The second absorption capacitor is connected between the second input terminal of the absorption half-bridge unit and the seventh switching transistor.

[0033] Optionally, the primary winding of the center-tapped transformer includes:

[0034] The first primary winding, wherein the same-named end of the first primary winding is the first end of the primary winding;

[0035] The second primary winding has its same-name end connected to the opposite-name end of the first primary winding and connected to the center tap. The opposite-name end of the second primary winding serves as the second end of the primary winding.

[0036] Optionally, it may also include a resonant unit connected to the center-tapped transformer.

[0037] Optionally, the resonant unit includes a resonant inductor connected between the same-name terminal of the secondary winding and the first input terminal of the secondary circuit.

[0038] Optionally, the resonant unit includes a coupling inductor, wherein the first terminal of the coupling inductor is connected to the first terminal of the primary winding, the first terminal of the coupling inductor is connected to the first input terminal of the half-bridge unit, the second terminal of the coupling inductor is connected to the second input terminal of the half-bridge unit, and the second terminal of the coupling inductor is connected to the second terminal of the primary winding.

[0039] Optionally, it also includes: a transformer leakage inductance connected between the center tap and the second busbar.

[0040] Optionally, it also includes: a third capacitor, the third capacitor being connected between the opposite terminal of the secondary winding and the second input terminal of the secondary circuit;

[0041] The third capacitor is a DC blocking capacitor or a resonant capacitor.

[0042] Optionally, the secondary-side circuit includes: a full-bridge unit;

[0043] The first input terminal of the full-bridge unit is connected to the first input terminal of the secondary circuit, and the second input terminal of the full-bridge unit is connected to the second input terminal of the secondary circuit.

[0044] The first output terminal of the full-bridge unit is connected to the first terminal of the load, and the second output terminal of the full-bridge unit is connected to the second terminal of the load.

[0045] Optionally, the full-bridge unit includes: a fifth bridge arm and a sixth bridge arm;

[0046] The first end of the fifth bridge arm is connected to the first input terminal of the full-bridge unit; the first end of the sixth bridge arm is connected to the second input terminal of the full-bridge unit; the second end of the fifth bridge arm is connected to the second end of the sixth bridge arm and to the first output terminal of the full-bridge unit; the third end of the fifth bridge arm is connected to the third end of the sixth bridge arm and to the second output terminal of the full-bridge unit.

[0047] Optionally, the fifth bridge arm includes: a ninth switch and a tenth switch;

[0048] The first terminal of the ninth switch is connected to the second terminal of the tenth switch, and is also connected to the first input terminal of the full-bridge unit; the second terminal of the ninth switch is connected to the first output terminal of the full-bridge unit; and the first terminal of the tenth switch is connected to the second output terminal of the full-bridge unit.

[0049] The sixth bridge arm includes: an eleventh switch and a twelfth switch;

[0050] The first terminal of the eleventh switch is connected to the second terminal of the twelfth switch, and is also connected to the second input terminal of the full-bridge unit; the second terminal of the eleventh switch is connected to the first output terminal of the full-bridge unit; and the first terminal of the twelfth switch is connected to the second output terminal of the full-bridge unit.

[0051] Optionally, each of the said switching transistors includes:

[0052] Si MOS, SiC MOS, and at least one of IGBT and FRD.

[0053] Optionally, it may also include a filtering unit, which is connected to the first bus and the second bus.

[0054] Optionally, the filtering unit includes: a filter inductor and a filter capacitor;

[0055] The filter inductor is connected in the second busbar;

[0056] The filter capacitor is connected between the first bus and the second bus.

[0057] Secondly, this application provides a control method for an on-board charger, the method being used in the on-board charger described in the first aspect, the method comprising:

[0058] The operating states of the half-bridge unit, the absorption half-bridge unit, and the secondary circuit are controlled to modulate the power factor and output power of the on-board charger.

[0059] Optionally, the half-bridge unit in the on-board charger includes: a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor;

[0060] The first end of the first switch is connected to the first input terminal of the half-bridge unit, the second end of the first switch is connected to the second end of the second switch, and the first end of the second switch is connected to the output terminal of the half-bridge unit; the first end of the third switch is connected to the second input terminal of the half-bridge unit, the second end of the third switch is connected to the second end of the fourth switch, and the first end of the fourth switch is connected to the output terminal of the half-bridge unit.

[0061] The control of the operating state of the half-bridge unit includes:

[0062] When the on-board charger is in charging mode or discharging mode, during the positive half-cycle of the AC power output from the AC power source, the first switch and the third switch are controlled to close, and the second switch and the fourth switch are controlled to generate complementary waves. During the negative half-cycle of the AC power output, the second switch and the fourth switch are controlled to close, and the first switch and the third switch are controlled to generate complementary waves.

[0063] Optionally, the absorption half-bridge unit in the on-board charger includes: a fifth switch, a sixth switch, a seventh switch, and an eighth switch;

[0064] The first end of the fifth switch is connected to the first input end of the absorption half-bridge unit, the second end of the fifth switch is connected to the second end of the sixth switch, and the first end of the sixth switch is connected to the output end of the absorption half-bridge unit; the first end of the seventh switch is connected to the second input end of the absorption half-bridge unit, the second end of the seventh switch is connected to the second end of the eighth switch, and the second end of the eighth switch is connected to the output end of the half-bridge unit.

[0065] The control of the operating state of the absorption half-bridge unit includes:

[0066] When the on-board charger is in charging mode or discharging mode, during the positive half-cycle of the AC power output from the AC power source, the sixth and eighth switches are controlled to close, and the fifth and seventh switches are controlled to generate complementary waves. During the negative half-cycle of the AC power source, the fifth and seventh switches are controlled to close, and the sixth and eighth switches are controlled to generate complementary waves.

[0067] Optionally, the secondary circuit of the on-board charger includes a full-bridge unit, which includes a ninth switch, a tenth switch, an eleventh switch, and a twelfth switch; the first terminal of the ninth switch is connected to the second terminal of the tenth switch and is also connected to the first input terminal of the full-bridge unit; the second terminal of the ninth switch is connected to the first output terminal of the full-bridge unit; the first terminal of the tenth switch is connected to the second output terminal of the full-bridge unit; the first terminal of the eleventh switch is connected to the second terminal of the twelfth switch and is also connected to the second input terminal of the full-bridge unit; the second terminal of the eleventh switch is connected to the first output terminal of the full-bridge unit; and the first terminal of the twelfth switch is connected to the second output terminal of the full-bridge unit.

[0068] The control of the operating state of the secondary circuit includes:

[0069] The secondary circuit is controlled to differ from the primary circuit by a first phase angle;

[0070] The eleventh switch is controlled to lag behind the second phase angle of the ninth switch, the twelfth switch is controlled to lag behind the second phase angle of the tenth switch, and the ninth and tenth switches are controlled to generate complementary waves.

[0071] The power factor and output power of the on-board charger are modulated according to the first phase angle and the second phase angle.

[0072] Thirdly, this application provides a vehicle including the on-board charger described in the first aspect.

[0073] The on-board charger and its control method, and the vehicle provided in this application embodiment include a primary circuit, a center-tapped transformer, and a secondary circuit. The first bus of the primary circuit is connected to the negative terminal of the AC power supply, and the second bus of the primary circuit is connected to the positive terminal of the AC power supply. The center tap of the center-tapped transformer is connected to the second bus. The primary circuit also includes a half-bridge unit and an absorption half-bridge unit. The two input terminals of the half-bridge unit and the two input terminals of the absorption half-bridge unit are respectively connected to the two ends of the primary winding of the center-tapped transformer. The output terminals of the half-bridge unit and the absorption half-bridge unit are both connected to the first bus. The two input terminals of the secondary circuit are respectively connected to the two ends of the secondary winding of the center-tapped transformer, and the output terminal of the secondary circuit is used to connect to the load. The solution of this application only has a single-stage AC-to-DC conversion. Through a single-stage topology, it integrates power factor correction and the primary side of high-voltage AC, eliminating the rectifier bridge arm, power factor correction inductor, and electrolytic capacitor required for power factor correction. This helps to reduce the board area and volume of the on-board charger, reduce the cost of the on-board charger, and improve the power conversion efficiency of the on-board charger. Attached Figure Description

[0074] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0075] Figure 1 Schematic diagram of the on-board charger provided in this application Figure 1 ;

[0076] Figure 2 Schematic diagram of the on-board charger provided in this application Figure 2 ;

[0077] Figure 3 Timing diagram of the on-board charger provided in this application Figure 1 ;

[0078] Figure 4 Timing diagram of the on-board charger provided in this application Figure 2 ;

[0079] Figure 5 A schematic diagram of the structure of the electronic device provided in this application.

[0080] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0081] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0082] An on-board charger (OBC) is a core power electronic component of new energy vehicles. An on-board charger can convert AC power from an external power source (grid) into high-voltage DC power to charge the power battery of a new energy vehicle.

[0083] Traditional on-board chargers include two stages of conversion: the first stage converts AC power to DC power, and the second stage converts the DC power provided by the first stage into voltage and current suitable for battery charging.

[0084] The pre-conversion stage includes a PFC (Power Factor Correction) rectifier bridge arm, a PFC power inductor, and a bus electrolytic capacitor. The PFC rectifier bridge arm converts AC to DC; the PFC power inductor stores energy and regulates the current waveform, ensuring the input current follows the voltage phase and improving the power factor; the bus electrolytic capacitor smooths the rectified DC voltage, reduces ripple, and provides stable energy to subsequent circuits.

[0085] The subsequent conversion stage includes an HVAC (High Voltage Alternating Current) side H-bridge, a resonant inductor, a transformer, and an HVDC (High Voltage Direct Current) side H-bridge. The HVAC side H-bridge converts DC to high-frequency AC so that voltage conversion can be achieved through the transformer; the HVDC side H-bridge rectifies and regulates the output voltage and current to ensure that the required voltage and current are provided to the battery; the resonant inductor reduces switching losses and improves the conversion efficiency of the transformer.

[0086] Therefore, the two-stage conversion of the on-board charger not only includes PFC inductors and bus electrolytic capacitors, but also bridge arms with a large number of tubes, resulting in the on-board charger being large in size, inefficient and expensive.

[0087] For example, PFC inductors are affected by DC offset, typically requiring larger magnetic cores and more windings to avoid saturation and maintain the desired inductance value. This increases the inductor's size, thus increasing the size of the on-board charger. Furthermore, the larger area of ​​the electrolytic capacitor prevents a reduction in the height of the on-board charger, further increasing its size.

[0088] Furthermore, the layout of the electrolytic capacitors also requires special attention. If the layout affects the uneven current distribution of the electrolytic capacitors, it will lead to a decrease in the lifespan of the electrolytic capacitors, thereby affecting the lifespan of the on-board charger.

[0089] Therefore, this application proposes an on-board charger, including a primary circuit, a center-tapped transformer, and a secondary circuit. The primary circuit includes a half-bridge unit and an absorption half-bridge unit. The single-stage topology integrates the PFC and HVAC primary sides, eliminating the PFC rectifier bridge arm, PFC inductor, and electrolytic capacitor. This helps reduce the board area and volume of the on-board charger, lowers the cost of the on-board charger, improves the power conversion efficiency of the on-board charger, and the removal of electrolytic capacitors helps improve the lifespan of the on-board charger.

[0090] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0091] Figure 1 The structural schematic diagram of the on-board charger provided in this application is as follows: Figure 1 As shown, the on-board charger provided in this application includes:

[0092] Primary circuit 101, center-tapped transformer 102, and secondary circuit 103;

[0093] The primary circuit 101 includes: a first bus and a second bus, wherein the first bus is connected to the negative terminal of the AC power supply and the second bus is connected to the positive terminal of the AC power supply;

[0094] The center tap of the center-tapped transformer 102 is connected to the second busbar;

[0095] The primary-side circuit 101 also includes:

[0096] Half-bridge unit 1011, the two input terminals of half-bridge unit 1011 are respectively connected to the two ends of the primary winding of center tap transformer 102, and the output terminal of half-bridge unit 1011 is connected to the first bus.

[0097] The absorption half-bridge unit 1012 has two input terminals connected to the two ends of the primary winding of the center tap transformer 102, and the output terminal of the absorption half-bridge unit 1012 is connected to the first busbar.

[0098] The input terminal of the secondary circuit 103 is connected to both ends of the secondary winding of the center tap transformer 102, and the output terminal of the secondary circuit 103 is used to connect the load.

[0099] For example, the primary circuit includes a first bus, a second bus, a half-bridge unit 1011, and an absorption half-bridge unit 1012. The half-bridge unit 1011 includes a first input terminal, a second input terminal, and an output terminal; the absorption half-bridge unit 1012 includes a first input terminal, a second input terminal, and an output terminal; the center-tapped transformer 102 includes a primary winding, a secondary winding, and a center tap. The primary winding includes a first end and a second end, and the secondary winding includes a first end and a second end. The secondary circuit 103 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal.

[0100] The first busbar is connected to the negative terminal of the AC power supply (e.g., Figure 1 The lower end of the AC power supply), the second busbar is connected to the positive terminal of the AC power supply (e.g., the lower end of the AC power supply). Figure 1(The upper end of the AC power supply). The first input terminal of the half-bridge unit 1011 is connected to the first end of the primary winding, the second input terminal of the half-bridge unit 1011 is connected to the second end of the primary winding, and the output terminal of the half-bridge unit 1011 is connected to the first bus; the first input terminal of the absorption half-bridge unit 1012 is connected to the first end of the primary winding, the second input terminal of the absorption half-bridge unit 1012 is connected to the second end of the primary winding, and the output terminal of the absorption half-bridge unit 1012 is connected to the second bus; the first input terminal of the secondary circuit 103 is connected to the first end of the secondary winding, the second input terminal of the secondary circuit 103 is connected to the second end of the secondary winding, the first output terminal of the secondary circuit 103 is connected to the first end of the load, and the second output terminal of the secondary circuit 103 is connected to the second end of the load.

[0101] In this embodiment, the on-board charger includes a primary circuit 101, a center-tapped transformer 102, and a secondary circuit 103. The primary circuit 101 includes a half-bridge unit 1011. The primary circuit 101 of the on-board charger can convert the power frequency voltage into a high-frequency voltage through switching operations. The combination of the primary circuit 101 and the secondary circuit 103 can also achieve modulation of the power factor and output power.

[0102] For example, the power factor (PF) is the ratio of active power (the power actually doing work) to apparent power (the product of voltage and current), usually expressed as cos(phi), where phi is the phase difference between voltage and current. If the phase difference between the primary circuit 101 and the secondary circuit 103 is large, the secondary current may lag or lead the primary voltage. This phase difference leads to an increase in reactive power, thereby reducing the power factor. The phase difference between different arms in the secondary circuit 103 may cause distortion of the output current and voltage waveforms, which also affects the power factor. For example, the distorted waveform usually contains resonant components, reducing the power factor. Therefore, by adjusting the phase difference between the primary circuit 101 and the secondary circuit 103, as well as the phase difference between different arms in the secondary circuit 103, the power factor of the on-board charger can be modulated.

[0103] For example, the phase difference between the primary circuit 101 and the secondary circuit 103 also affects the power transfer efficiency from the primary circuit 101 to the secondary circuit 103. A larger phase difference may lead to increased power loss and reduced output power. The phase difference between different arms of the secondary circuit 103 also affects the waveform of the output voltage and current, thereby affecting the output power.

[0104] In this embodiment, the center-tapped transformer 102 transmits high-frequency alternating current to the secondary circuit 103. The center-tapped transformer 102 utilizes the transformer core in both directions, reducing core size and losses, thus enabling higher efficiency. The symmetrical structure of the center-tapped transformer 102 allows the transformer core to be alternately magnetized in both positive and negative directions, helping to avoid core saturation. The symmetry of the push-pull structure also results in a more balanced current waveform, reducing electromagnetic interference. The secondary circuit 103 rectifies the high-frequency alternating current output from the center-tapped transformer 102 into direct current, providing it to a load, which may include a battery or other electrical equipment.

[0105] Furthermore, the applicant considered that the half-bridge unit 1011 may generate transient energy during switching, which can easily lead to voltage spikes and electromagnetic interference. Therefore, in this embodiment, the primary-side circuit also includes an absorption half-bridge unit 1012. The absorption half-bridge unit 1012 is connected between the primary winding and the first busbar, and can absorb excess energy in the primary-side circuit 101, especially transient energy generated during switching, which helps to clamp voltage spikes and reduce electromagnetic interference. The absorption half-bridge unit 1012 also helps to manage the waveforms of voltage and current, reducing unnecessary oscillations and fluctuations.

[0106] It should be noted that the center tap of the center-tapped transformer 102 is connected to the positive busbar, and its two output terminals are connected to the first and second input terminals of the half-bridge unit 1011 and the absorption half-bridge unit 1012, respectively. The output terminals of the half-bridge unit 1011 and the absorption half-bridge unit 1012 are connected to the negative busbar. The center tap of the center-tapped transformer 102, connected to the positive power supply, is the input terminal of the transformer; the two ends of the primary winding of the center-tapped transformer 102 are the two output terminals of the transformer. Similarly, the end of the half-bridge unit 1011 and the absorption half-bridge unit 1012 connected to the negative busbar is the output terminal, and the two ends connected to the primary winding of the center-tapped transformer 102 are the input terminals.

[0107] The two input terminals of the absorption half-bridge unit 1012 are respectively connected to the two ends of the primary winding of the center-tapped transformer 102; the two input terminals of the half-bridge unit 1012 are also respectively connected to the two ends of the primary winding of the center-tapped transformer 102; therefore, the absorption half-bridge and the half-bridge unit form a common connection point (e.g., Figure 1 (a and b in the text).

[0108] In some optional embodiments, the half-bridge unit 1011 includes a first bridge arm and a second bridge arm. The first bridge arm is connected between the first input terminal and the output terminal of the half-bridge unit 1011, that is, the first end of the first bridge arm is connected to the first input terminal of the half-bridge unit 1011, and the second end of the first bridge arm is connected to the output terminal of the half-bridge unit 1011. The second bridge arm is connected between the second input terminal and the output terminal of the half-bridge unit 1011, that is, the first end of the second bridge arm is connected to the second input terminal of the half-bridge unit 1011, and the second end of the second bridge arm is connected to the output terminal of the half-bridge unit 1011. By turning the first bridge arm on or off, and by turning the second bridge arm on or off, the half-bridge unit 1011 can be turned on or off, thereby converting the power frequency voltage into a high frequency voltage.

[0109] For example, half-bridge unit 1011 may also include more than two bridge arms.

[0110] In one possible implementation, the first bridge arm includes a first switch P1 and a second switch P2; the first end of the first switch P1 is connected to the first input terminal of the half-bridge unit 1011, the second end of the first switch P1 is connected to the second end of the second switch P2, and the first end of the second switch P2 is connected to the output terminal of the half-bridge unit 1011. The first bridge arm can be switched on or off by turning the first switch P1 and the second switch P2 on or off. For example, when both the first switch P1 and the second switch P2 are on, the first bridge arm is on, allowing the AC power output from the AC power supply to be transmitted to the transformer unit 102.

[0111] The second bridge arm includes a third switch P3 and a fourth switch P4. The first end of the third switch P3 is connected to the second input terminal of the half-bridge unit 1011, and the second end of the third switch P3 is connected to the second end of the fourth switch P4. The first end of the fourth switch P4 is connected to the output terminal of the half-bridge unit 1011. By turning the third switch P3 and the fourth switch P4 on or off, the second bridge arm can be turned on or off. For example, when both the third switch P3 and the fourth switch P4 are on, the second bridge arm is on, allowing the AC power output from the AC power supply to be transmitted to the transformer unit 102.

[0112] For example, during the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are turned on, while the second switch P2 and the fourth switch P4 generate complementary waveforms. For instance, the second switch P2 and the fourth switch P4 can use a 50% complementary waveform generation. During the negative half-cycle of the AC power output, the second switch P2 and the fourth switch P4 are turned on, while the first switch P1 and the third switch P3 generate complementary waveforms. For instance, the first switch P1 and the third switch P3 can use a 50% complementary waveform generation. Here, 50% complementary waveform generation means that the two switches are turned on or off in a complementary manner, and the on-time of each switch accounts for 50% of the entire switching cycle.

[0113] For example, the first and second bridge arms may also include one or more switching transistors.

[0114] For example, each switch in the half-bridge unit 1011 may include at least one of Si MOS (Metal Oxide Semiconductor), SiC MOS, IGBT (Insulated Gate Bipolar Transistor), and FRD (Fast Recovery Diode). The source of the MOS transistor may serve as the first terminal of the corresponding switch, and the drain of the MOS transistor may serve as the second terminal of the corresponding switch.

[0115] In one possible implementation, the absorption half-bridge unit 1012 includes a third arm and a fourth arm. The third arm is connected between the first input terminal and the output terminal of the absorption half-bridge unit 1012, that is, the first end of the third arm is connected to the first input terminal of the absorption half-bridge unit 1012, and the second end of the third arm is connected to the output terminal of the absorption half-bridge unit 1012. The fourth arm is connected between the second input terminal and the output terminal of the absorption half-bridge unit 1012, that is, the first end of the fourth arm is connected to the second input terminal of the absorption half-bridge unit 1012, and the second end of the fourth arm is connected to the output terminal of the absorption half-bridge unit 1012. By turning the first arm on or off, and by turning the second arm on or off, the absorption half-bridge unit 1012 can be turned on or off. Combined with the turning on or off of the half-bridge unit 1011, the power frequency voltage can be converted into a high frequency voltage.

[0116] For example, when the first and fourth bridge arms are conducting, the AC power output from the AC power supply flows into the center tap transformer 102 through the first and fourth bridge arms. When the second and third bridge arms are conducting, the AC power output from the AC power supply flows into the center tap transformer 102 through the second and third bridge arms.

[0117] In one possible implementation, the third bridge arm includes a fifth switch clamp1 and a sixth switch clamp2. The first end of the fifth switch clamp1 is connected to the first input terminal of the absorption half-bridge unit 1012, the second end of the fifth switch clamp1 is connected to the second end of the sixth switch clamp2, and the first end of the sixth switch clamp2 is connected to the output terminal of the absorption half-bridge unit 1012. The fourth bridge arm includes a seventh switch clamp3 and an eighth switch clamp4. The first end of the seventh switch clamp3 is connected to the second input terminal of the absorption half-bridge unit 1012, the second end of the seventh switch clamp3 is connected to the second end of the eighth switch clamp4, and the second end of the eighth switch clamp4 is connected to the output terminal of the absorption half-bridge unit 1012.

[0118] For example, when both the fifth switch (clamp1) and the sixth switch (clamp2) are turned on, the third bridge arm is turned on, allowing the AC power output from the AC power supply to be transmitted to the center-tapped transformer 102. When both the seventh switch (clamp3) and the eighth switch (clamp4) are turned on, the fourth bridge arm is turned on, allowing the AC power output from the AC power supply to be transmitted to the center-tapped transformer 102.

[0119] For example, the fifth switch clamp1 is driven by the fourth switch P4, the sixth switch clamp2 is driven by the third switch P3, the seventh switch clamp3 is driven by the second switch P2, and the eighth switch clamp4 is driven by the first switch P1.

[0120] For example, during the positive half-cycle of the AC output from the AC power supply, the first switch P1 and the third switch P3 are turned on, the sixth switch clamp2 and the eighth switch clamp4 are turned on, the second switch P2 and the fourth switch P4 generate complementary waveforms, and the fifth switch clamp1 and the seventh switch clamp3 generate complementary waveforms. For example, the second switch P2 and the fourth switch P4 can use 50% complementary waveform generation, and the fifth switch clamp1 and the seventh switch clamp3 can use 50% complementary waveform generation.

[0121] During the negative half-cycle of the AC output, the second switch P2 and the fourth switch P4 are turned on, as are the fifth switch clamp1 and the seventh switch clamp3. The first switch P1 and the third switch P3 generate complementary waveforms, and the sixth switch clamp2 and the eighth switch clamp4 generate complementary waveforms. For example, the first switch P1 and the third switch P3 can generate complementary waveforms with a 50% complementarity, and the sixth switch clamp2 and the eighth switch clamp4 can generate complementary waveforms with a 50% complementarity.

[0122] For example, the third and fourth bridge arms may also include one or more switching transistors.

[0123] In one possible implementation, the third bridge arm may include a first resistor connected between the first input and output terminals of the half-bridge unit 1011. The fourth bridge arm may include a second resistor connected between the second input and output terminals of the half-bridge unit 1011. The resistors can be used in a simple RC damping network to reduce oscillations and overshoot, or to convert excess energy into heat, thereby reducing voltage spikes.

[0124] For example, the absorption half-bridge unit 1012 further includes a first absorption capacitor C1 and a second absorption capacitor C2. The first absorption capacitor C1 is connected between the first input terminal of the absorption half-bridge unit 1012 and the first end of the third bridge arm, and the second absorption capacitor C2 is connected between the second input terminal of the absorption half-bridge unit 1012 and the first end of the fourth bridge arm.

[0125] In one possible implementation, the first absorption capacitor C1 is connected between the first input terminal of the absorption half-bridge unit 1012 and the fifth switching transistor clamp1. The second absorption capacitor C2 is connected between the second input terminal of the half-bridge unit 1011 and the seventh switching transistor clamp3. Since voltage spikes are also generated during the switching process of the absorption half-bridge unit 1012, the first absorption capacitor C1 and the second absorption capacitor C2 can be charged and discharged quickly to absorb the spike energy.

[0126] In some alternative embodiments, the secondary circuit 103 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal of the secondary circuit 103 is connected to the first input terminal of the secondary winding of the center-tapped transformer 102, the second input terminal of the secondary circuit 103 is connected to the second input terminal of the secondary winding of the center-tapped transformer 102, the first output terminal of the secondary circuit 103 is connected to the first terminal of the load, and the second output terminal of the secondary circuit 103 is connected to the second terminal of the load.

[0127] The secondary circuit 103 may include a full-bridge unit 1031, which includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal of the full-bridge unit 1031 is connected to the first input terminal of the secondary circuit 103; the second input terminal of the full-bridge unit 1031 is connected to the second input terminal of the secondary circuit 103; the first output terminal of the full-bridge unit 1031 is connected to the first output terminal of the secondary circuit 103; and the second output terminal of the full-bridge unit 1031 is connected to the second output terminal of the secondary circuit 103. The full-bridge unit 1031 can rectify the high-frequency AC power output from the center-tapped transformer 102 into DC power to supply the load.

[0128] For example, the first end of the load can be the positive end of the load, and the second end of the load can be the negative end of the load.

[0129] In one possible implementation, the full-bridge unit 1031 includes a fifth bridge arm and a sixth bridge arm; the first end of the fifth bridge arm is connected to the first input terminal of the full-bridge unit 1031; the first end of the sixth bridge arm is connected to the second input terminal of the full-bridge unit 1031; the second end of the fifth bridge arm is connected to the second end of the sixth bridge arm and to the first output terminal of the full-bridge unit 1031; the third end of the fifth bridge arm is connected to the third end of the sixth bridge arm and to the second output terminal of the full-bridge unit 1031. Through the fifth and sixth bridge arms, the high-voltage AC power output from the transformer unit 102 is converted into DC power.

[0130] For example, the full-bridge unit 1031 may also include more than two bridge arms.

[0131] In one possible implementation, the fifth bridge arm includes a ninth switch S1 and a tenth switch S2; the first end of the ninth switch S1 is connected to the second end of the tenth switch S2, serving as the first end of the fifth bridge arm and connected to the first input terminal of the full-bridge unit 1031; the second end of the ninth switch S1 serves as the second end of the fifth bridge arm and is connected to the first output terminal of the full-bridge unit 1031, and the first end of the tenth switch S2 serves as the third end of the fifth bridge arm and is connected to the second output terminal of the full-bridge unit 1031. The sixth bridge arm includes an eleventh switch S3 and a twelfth switch S4; the first end of the eleventh switch S3 is connected to the second end of the twelfth switch S4, serving as the first end of the sixth bridge arm and connected to the second input terminal of the full-bridge unit 1031; the second end of the eleventh switch S3 serves as the second end of the sixth bridge arm and is connected to the first output terminal of the full-bridge unit 1031, and the first end of the twelfth switch S4 serves as the third end of the sixth bridge arm and is connected to the second output terminal of the full-bridge unit 1031. By turning on or off each switch in the full-bridge unit 1031, the high-voltage AC power output from the center-tapped transformer 102 can be converted into DC power.

[0132] For example, during the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are turned on, the sixth switch clamp2 and the eighth switch clamp4 are turned on, the second switch P2 and the fourth switch P4 generate complementary waveforms, and the fifth switch clamp1 and the seventh switch clamp3 generate complementary waveforms. The secondary circuit 103 is controlled to differ from the primary circuit 101 by a first phase angle, and simultaneously the sixth bridge arm is controlled to lag behind the fifth bridge arm by a second phase angle. That is, the eleventh switch S3 is controlled to lag behind the ninth switch S1 by a second phase angle, the twelfth switch S4 is controlled to lag behind the tenth switch S2 by a second phase angle, and the ninth switch S1 and the tenth switch S2 generate complementary waveforms. Thus, the power factor and output power of the on-board charger can be modulated according to the first and second phase angles. For example, when the on-board charger is in charging mode, the secondary circuit 103 lags behind the primary circuit 101 by the first phase angle, and when the on-board charger is in discharging mode, the secondary circuit 103 leads the primary circuit 101 by the first phase angle.

[0133] During the negative half-cycle of the AC power output, the second switch P2 and the fourth switch P4 are turned on, the fifth switch clamp1 and the seventh switch clamp3 are turned on, the first switch P1 and the third switch P3 generate complementary waveforms, and the sixth switch clamp2 and the eighth switch clamp4 generate complementary waveforms. The secondary circuit 103 is controlled to differ from the primary circuit 101 by a first phase angle. Simultaneously, the eleventh switch S3 is controlled to lag behind the ninth switch S1 by a second phase angle, the twelfth switch S4 is controlled to lag behind the tenth switch S2 by a second phase angle, and the ninth switch S1 and the tenth switch S2 generate complementary waveforms. Thus, the power factor and output power of the on-board charger can be modulated according to the first and second phase angles.

[0134] For example, the fifth and sixth bridge arms may also include more than two switching transistors.

[0135] In one possible implementation, each switch in the full-bridge unit 1031 may include a combination of IGBT and FRD, Si MOS, or at least one of SiC MOS.

[0136] For example, the secondary circuit 103 may also include a filter capacitor C0 connected between the first output terminal and the second output terminal of the secondary circuit 103. The filter capacitor C0 can be used to smooth the output voltage and current waveforms, reduce ripple, and temporarily store energy to provide instantaneous current support when the load demand suddenly increases, which helps to stabilize the output voltage and avoid voltage fluctuations caused by load changes.

[0137] In one possible implementation, the primary winding of the center-tapped transformer 102 includes a first primary winding and a second primary winding. The same-name terminal of the first primary winding serves as the first terminal of the primary winding, and the same-name terminal of the second primary winding is connected to the opposite-name terminal of the first primary winding and connected to the center tap. The opposite-name terminal of the second primary winding serves as the second terminal of the primary winding. The same-name terminal of the secondary winding is connected to the first input terminal of the secondary circuit 101, and the opposite-name terminal of the secondary winding is connected to the second input terminal of the secondary circuit 101. Through the primary and secondary windings, voltage conversion can be achieved, for example, the voltage can be increased or decreased to convert the voltage to the voltage required by the load.

[0138] In some alternative implementations, the on-board charger may include a resonant unit connected to a center-tapped transformer 102 to smooth the rate of change of current, reduce voltage or current spikes when the switching transistor is turned off, and reduce electromagnetic interference.

[0139] In one possible implementation, the resonant unit is located on the secondary side, such as... Figure 1 As shown, the resonant unit includes a resonant inductor Lr, which is connected between the same-name terminal of the secondary winding and the first input terminal of the secondary circuit 103.

[0140] In one possible implementation, the resonant unit is located on the original side, such as... Figure 2 As shown, to accommodate the structure of the center-tapped transformer 102 with two primary windings, the resonant unit includes a coupling inductor Lr0. The first terminal of the coupling inductor Lr0 is connected to the first terminal of the primary winding, the first terminal of the coupling inductor Lr0 is connected to the first input terminal of the half-bridge unit 1011, the second terminal of the coupling inductor Lr0 is connected to the second input terminal of the half-bridge unit 1011, and the second terminal of the coupling inductor Lr0 is connected to the second terminal of the primary winding. The coupling inductor Lr0 can cancel the DC bias.

[0141] In one possible implementation, the on-board charger also includes a transformer leakage inductance Lk, which is connected between the center tap and the second busbar. The transformer leakage inductance Lk can serve as part of an energy storage element, aiding in energy transfer and conversion, and can also limit the rate of current rise in the circuit, protecting circuit components from overcurrent damage.

[0142] In one possible implementation, the on-board charger may further include a third capacitor C3, which is connected between the opposite terminal of the secondary winding and the second input terminal of the secondary circuit 103. The third capacitor C3 may be a DC blocking capacitor or a resonant capacitor. If the third capacitor C3 is a resonant capacitor, it can form an LC resonant circuit with the resonant inductor Lr, which helps reduce switching losses, improve system efficiency, and reduce electromagnetic interference (EMI). If the third capacitor C3 is a DC blocking capacitor, it allows AC signals to pass through while allowing DC current to pass through, ensuring correct signal transmission and normal circuit operation.

[0143] In some optional implementations, the primary-side circuit may further include a filtering unit connected to the first bus and the second bus of the primary-side circuit 101. The filtering unit can smooth the voltage on the bus, reduce ripple voltage, suppress high-frequency noise and electromagnetic interference, and improve the electromagnetic compatibility of the system.

[0144] In one possible implementation, the filtering unit includes a filter inductor Lf and a filter capacitor Cf. The filter inductor Lf is connected in the second bus of the primary circuit 101, and the filter capacitor Cf is connected between the first bus and the second bus of the primary circuit 101. The filter structure formed by the filter inductor Lf and the filter capacitor Cf achieves the filtering effect.

[0145] For example, the filter unit may also include other components such as damping resistors.

[0146] The on-board charger provided in this application eliminates the PFC rectifier bridge arm, PFC inductor, and electrolytic capacitor, which helps to reduce the board area and volume of the on-board charger, reduce the cost of the on-board charger, improve the power conversion efficiency of the on-board charger, and remove the electrolytic capacitor helps to improve the lifespan of the on-board charger.

[0147] This application also provides a control method for an on-board charger, which can be used in the above-mentioned on-board charger. The control method provided in the embodiments of this application may include:

[0148] S101 controls the operating state of the half-bridge unit 1011, absorbs the operating state of the half-bridge unit 1012 and the operating state of the secondary circuit 103, so as to modulate the power factor and output power of the on-board charger.

[0149] In one possible implementation, the on-board charger includes a half-bridge unit 1011, which includes a first switch P1, a second switch P2, a third switch P3, and a fourth switch P4. The first terminal of the first switch P1 is connected to the first input terminal of the half-bridge unit 1011, the second terminal of the first switch P1 is connected to the second terminal of the second switch P2, and the first terminal of the second switch P2 is connected to the output terminal of the half-bridge unit 1011. The first terminal of the third switch P3 is connected to the second input terminal of the half-bridge unit 1011, the second terminal of the third switch P3 is connected to the second terminal of the fourth switch P4, and the first terminal of the fourth switch P4 is connected to the output terminal of the half-bridge unit 1011.

[0150] like Figure 3 As shown, when the on-board charger is in charging or discharging mode, during the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are closed, and the second switch P2 and the fourth switch P4 are controlled to generate complementary waves. During the negative half-cycle of the AC power output, as shown... Figure 4 As shown, the second switch P2 and the fourth switch P4 are closed, and the first switch P1 and the third switch P3 are controlled to generate complementary waves.

[0151] In one possible implementation, the on-board charger includes an absorption half-bridge unit 1012, which comprises a fifth switch clamp1, a sixth switch clamp2, a seventh switch clamp3, and an eighth switch clamp4. The first terminal of the fifth switch clamp1 is connected to the first input terminal of the absorption half-bridge unit 1012, the second terminal of the fifth switch clamp1 is connected to the second terminal of the sixth switch clamp2, and the first terminal of the sixth switch clamp2 is connected to the output terminal of the absorption half-bridge unit 1012. The first terminal of the seventh switch clamp3 is connected to the second input terminal of the absorption half-bridge unit 1012, the second terminal of the seventh switch clamp3 is connected to the second terminal of the eighth switch clamp4, and the second terminal of the eighth switch clamp4 is connected to the output of the absorption half-bridge unit 1012.

[0152] like Figure 3 As shown, when the on-board charger is in charging or discharging mode, during the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are turned on, the sixth switch clamp2 and the eighth switch clamp4 are turned on, the second switch P2 and the fourth switch P4 generate complementary waveforms, and the fifth switch clamp1 and the seventh switch clamp3 generate complementary waveforms. During the negative half-cycle of the AC power, as... Figure 4As shown, the second switch P2 and the fourth switch P4 are turned on, while the sixth switch clamp2 and the eighth switch clamp4 are turned off, thus controlling the sixth switch clamp2 and the eighth switch clamp4 to generate complementary waves.

[0153] In one possible implementation, the on-board charger includes a secondary circuit 103, which includes a full-bridge unit 1031. The full-bridge unit 1031 includes a ninth switch S1, a tenth switch S2, an eleventh switch S3, and a twelfth switch S4. The first terminal of the ninth switch S1 is connected to the second terminal of the tenth switch S2 and is also connected to the first input terminal of the full-bridge unit 1031. The second terminal of the ninth switch S1 is connected to the first output terminal of the full-bridge unit 1031. The first terminal of the tenth switch S2 is connected to the second output terminal of the full-bridge unit 1031. The first terminal of the eleventh switch S3 is connected to the second terminal of the twelfth switch S4 and is also connected to the second input terminal of the full-bridge unit 1031. The second terminal of the eleventh switch S3 is connected to the first output terminal of the full-bridge unit 1031. The first terminal of the twelfth switch S4 is connected to the second output terminal of the full-bridge unit 1031.

[0154] like Figure 3 and Figure 4 As shown, the control secondary circuit 103 differs from the primary circuit 101 by a first phase angle α, that is, the switching timing of the control secondary full bridge differs from the switching timing of the primary half bridge by a first phase angle α.

[0155] Simultaneously, the seventh switch S3 is controlled to lag the fifth switch S1 by the second phase angle β, the eighth switch S4 is controlled to lag the sixth switch S2 by the second phase angle β, and the fifth switch S1 and the sixth switch S2 are controlled to generate complementary waves, so that the power factor and output power of the on-board charger can be modulated according to the first phase angle α and the second phase angle β.

[0156] It should be noted that, as Figure 3 and Figure 4 As shown, the first switch P1 and the third switch P3 on the primary side generate complementary waves, or the second switch P2 and the fourth switch P4 generate complementary waves, so that the bus voltage Uab of the primary circuit is twice the input voltage Ucd of the secondary circuit.

[0157] For example, the expression for adjusting the output power based on the first phase angle and the second phase angle is:

[0158]

[0159] in, This represents the instantaneous value of the AC power output from the AC power source. This is the output voltage of the secondary circuit; The first phase angle, <In charging mode, A value less than 0 indicates a discharge mode; This is the second phase angle; It is a resonant inductor; This represents the switching frequency of the transistors in the full-bridge unit. This indicates the turns ratio of the primary winding to the secondary winding of the transformer unit in the on-board charger.

[0160] Therefore, by designing the resonant inductor, switching frequency, and adjusting... and It can adjust the output power of the on-board charger.

[0161] For example, when the on-board charger is in charging mode:

[0162] During the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are closed, and the second switch P2 and the fourth switch P4 are controlled to generate complementary waves. At the same time, the driving signal timing of the ninth switch S1 and the tenth switch S2 is delayed by a first phase angle α relative to the driving timing of the half-bridge unit and the absorption half-bridge unit (each switch of the half-bridge), and the eleventh switch S3 and the twelfth switch S4 are delayed by a second phase angle β relative to the ninth switch S1 and the tenth switch S2.

[0163] During the negative half-cycle of the AC power output, the second switch P2 and the fourth switch P4 are closed, and the first switch P1 and the third switch P3 are controlled to generate complementary waves. At the same time, the driving signal timing of the ninth switch S1 and the tenth switch S2 is delayed by a first phase angle α relative to the driving timing of the half-bridge unit and the absorption half-bridge unit (each switch of the half-bridge), and the eleventh switch S3 and the twelfth switch S4 are delayed by a second phase angle β relative to the ninth switch S1 and the tenth switch S2.

[0164] When the on-board charger is in discharge mode:

[0165] During the positive half-cycle of the AC power output, the first switch P1 and the third switch P3 are controlled to close, and the second switch P2 and the fourth switch P4 are controlled to generate complementary waves. At the same time, the driving signal timing of the ninth switch S1 and the tenth switch S2 is controlled to lead the driving timing of the half-bridge unit and the absorption half-bridge unit (each switch of the half-bridge) by a first phase angle α, and the eleventh switch S3 and the twelfth switch S4 are controlled to lag the ninth switch S1 and the tenth switch S2 by a second phase angle β.

[0166] During the negative half-cycle of the AC power output, the second switch P2 and the fourth switch P4 are closed, and the first switch P1 and the third switch P3 are controlled to generate complementary waves. At the same time, the driving signal timing of the ninth switch S1 and the tenth switch S2 is ahead of the driving timing of the half-bridge unit and the absorption half-bridge unit (each switch of the half-bridge) by a first phase angle α, and the eleventh switch S3 and the twelfth switch S4 are lagging behind the ninth switch S1 and the tenth switch S2 by a second phase angle β.

[0167] It should be noted that the fifth switch, clamp1, is driven by the fourth switch, P4, and can also be included within the fourth switch, P4; the sixth switch, camlp2, is driven by the third switch, P3, and can also be included within the third switch, P3; the seventh switch, clamp3, is driven by the second switch, P2, and can also be included within the second switch, P2; and the eighth switch, clamp4, is driven by the first switch, P1, and can also be included within the first switch, P1.

[0168] Figure 5 A schematic diagram of the structure of the electronic device provided in this application. Figure 5 As shown, the electronic device 50 provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the electronic device 50 further includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus.

[0169] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.

[0170] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0171] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0172] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0173] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0174] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0175] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0176] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An on-board charger, characterized in that, include: The circuit consists of a primary circuit (101), a center-tapped transformer (102), and a secondary circuit (103); the first bus of the primary circuit (101) is connected to the negative terminal of the AC power supply, and the second bus is connected to the positive terminal of the AC power supply; the center tap of the center-tapped transformer (102) is connected to the second bus. The primary-side circuit (101) includes: A half-bridge unit (1011) is provided, wherein the two input terminals of the half-bridge unit (1011) are respectively connected to the two ends of the primary winding of the center tap transformer (102), and the output terminal of the half-bridge unit (1011) is connected to the first busbar. An absorption half-bridge unit (1012) is provided, wherein the two input terminals of the absorption half-bridge unit (1012) are respectively connected to the two ends of the primary winding of the center tap transformer (102), and the output terminal of the half-bridge unit (1012) is connected to the first busbar. The two input terminals of the secondary circuit (103) are respectively connected to the two ends of the secondary winding of the center tap transformer (102), and the output terminal of the secondary circuit (103) is used to connect the load.

2. The on-board charger according to claim 1, characterized in that, The half-bridge unit (1011) includes: a first bridge arm and a second bridge arm; The first bridge arm is connected between the first input terminal and the output terminal of the half-bridge unit (1011); The second bridge arm is connected between the second input and the output of the half-bridge unit (1011).

3. The on-board charger according to claim 2, characterized in that, The first bridge arm includes: a first switch (P1) and a second switch (P2); The first end of the first switch (P1) is connected to the first input end of the half-bridge unit (1011), the second end of the first switch (P1) is connected to the second end of the second switch (P2), and the first end of the second switch (P2) is connected to the output end of the half-bridge unit (1011). The second bridge arm includes a third switch (P3) and a fourth switch (P4). The first end of the third switch (P3) is connected to the second input end of the half-bridge unit (1011), the second end of the third switch (P3) is connected to the second end of the fourth switch (P4), and the first end of the fourth switch (P4) is connected to the output end of the half-bridge unit (1011).

4. The on-board charger according to claim 2, characterized in that, The absorption half-bridge unit (1012) includes: a third bridge arm and a fourth bridge arm; The third bridge arm is connected between the first input terminal and the output terminal of the absorption half-bridge unit (1012); The fourth bridge arm is connected between the second input and the output of the absorption half-bridge unit (1012).

5. The on-board charger according to claim 4, characterized in that, The third bridge arm includes: a fifth switch (clamp1) and a sixth switch (clamp2). The first end of the fifth switch (clamp1) is connected to the first input end of the absorption half-bridge unit (1012), the second end of the fifth switch (clamp1) is connected to the second end of the sixth switch (clamp2), and the first end of the sixth switch (clamp2) is connected to the output end of the absorption half-bridge unit (1012). The fourth bridge arm includes: a seventh switch (clamp3) and an eighth switch (clamp4). The first end of the seventh switch (clamp3) is connected to the second input end of the absorption half-bridge unit (1012), the second end of the seventh switch (clamp3) is connected to the second end of the eighth switch (clamp4), and the first end of the eighth switch (clamp4) is connected to the output end of the absorption half-bridge unit (1012).

6. The on-board charger according to claim 4, characterized in that, The third bridge arm includes: a first resistor; The first resistor is connected between the first input terminal and the output terminal of the absorption half-bridge unit (1012); The fourth bridge arm includes: a second resistor; The second resistor is connected between the second input terminal and the output terminal of the absorption half-bridge unit (1012).

7. The on-board charger according to claim 5, characterized in that, The absorption half-bridge unit (1012) further includes: a first absorption capacitor (C1) and a second absorption capacitor (C2); The first absorption capacitor (C1) is connected between the first input terminal of the absorption half-bridge unit (1012) and the fifth switching transistor (clamp1); The second absorption capacitor (C2) is connected between the second input terminal of the absorption half-bridge unit (1012) and the seventh switch (clamp3).

8. The on-board charger according to claim 1, characterized in that, The primary winding of the center-tapped transformer (102) includes: The first primary winding, wherein the same-named end of the first primary winding is the first end of the primary winding; The second primary winding has its same-name end connected to the opposite-name end of the first primary winding and connected to the center tap. The opposite-name end of the second primary winding serves as the second end of the primary winding.

9. The on-board charger according to claim 8, characterized in that, Also includes: A resonant unit, which is connected to the center tap transformer (102).

10. The on-board charger according to claim 9, characterized in that, The resonant unit includes a resonant inductor (Lr) connected between the same-name terminal of the secondary winding and the first input terminal of the secondary circuit (103).

11. The on-board charger according to claim 9, characterized in that, The resonant unit includes a coupling inductor (Lr0), the first terminal of which is connected to the first terminal of the primary winding, the first terminal of which is connected to the first input terminal of the half-bridge unit (1011), the second terminal of which is connected to the second input terminal of the half-bridge unit (1011), and the second terminal of which is connected to the second terminal of the primary winding.

12. The on-board charger according to claim 8, characterized in that, Also includes: The transformer leakage inductance (Lk) is connected between the center tap and the second busbar.

13. The on-board charger according to claim 8, characterized in that, It also includes: a third capacitor (C3), which is connected between the opposite terminal of the secondary winding and the second input terminal of the secondary circuit (103); The third capacitor is a DC blocking capacitor or a resonant capacitor.

14. The on-board charger according to claim 1, characterized in that, The secondary circuit (103) includes: a full-bridge unit (1031); The first input terminal of the full-bridge unit (1031) is connected to the first input terminal of the secondary circuit (103), and the second input terminal of the full-bridge unit (1031) is connected to the second input terminal of the secondary circuit (103). The first output terminal of the full-bridge unit (1031) is connected to the first terminal of the load, and the second output terminal of the full-bridge unit (1031) is connected to the second terminal of the load.

15. The on-board charger according to claim 14, characterized in that, The full-bridge unit (1031) includes: a fifth bridge arm and a sixth bridge arm; The first end of the fifth bridge arm is connected to the first input terminal of the full-bridge unit (1031); the first end of the sixth bridge arm is connected to the second input terminal of the full-bridge unit (1031); the second end of the fifth bridge arm is connected to the second end of the sixth bridge arm and to the first output terminal of the full-bridge unit (1031); the third end of the fifth bridge arm is connected to the third end of the sixth bridge arm and to the second output terminal of the full-bridge unit (1031).

16. The on-board charger according to claim 15, characterized in that, The fifth bridge arm includes: a ninth switch (S1) and a tenth switch (S2). The first end of the ninth switch (S1) is connected to the second end of the tenth switch (S2) and to the first input end of the full-bridge unit (1031); the second end of the ninth switch (S1) is connected to the first output end of the full-bridge unit (1031); the first end of the tenth switch (S2) is connected to the second output end of the full-bridge unit (1031). The sixth bridge arm includes: the eleventh switch (S3) and the twelfth switch (S4); The first end of the eleventh switch (S3) is connected to the second end of the twelfth switch (S4) and to the second input end of the full bridge unit (1031); the second end of the eleventh switch (S3) is connected to the first output end of the full bridge unit (1031); the first end of the twelfth switch (S4) is connected to the second output end of the full bridge unit (1031).

17. The on-board charger according to claim 3, 5, or 16, characterized in that, Each of the aforementioned switching transistors includes: Si MOS, SiC MOS, and at least one of IGBT and FRD.

18. The on-board charger according to any one of claims 1-16, characterized in that, Also includes: A filtering unit is provided, which is connected to the first bus and the second bus.

19. The on-board charger according to claim 18, characterized in that, The filtering unit includes: a filter inductor (Lf) and a filter capacitor (Cf); The filter inductor (Lf) is connected in the second busbar; The filter capacitor (Cf) is connected between the first bus and the second bus.

20. A control method for an on-board charger, characterized in that, The method is used in the on-board charger according to any one of claims 1-19, the method comprising: The operating states of the half-bridge unit (1011), the absorption half-bridge unit (1012), and the secondary circuit (103) are controlled to modulate the power factor and output power of the on-board charger.

21. The method according to claim 20, characterized in that, The half-bridge unit (1011) in the on-board charger includes: a first switch (P1), a second switch (P2), a third switch (P3), and a fourth switch (P4). The first terminal of the first switch (P1) is connected to the first input terminal of the half-bridge unit (1011), the second terminal of the first switch (P1) is connected to the second terminal of the second switch (P2), and the first terminal of the second switch (P2) is connected to the output terminal of the half-bridge unit (1011); the first terminal of the third switch (P3) is connected to the second input terminal of the half-bridge unit (1011), the second terminal of the third switch (P3) is connected to the second terminal of the fourth switch (P4), and the first terminal of the fourth switch (P4) is connected to the output terminal of the half-bridge unit (1011); The control of the operating state of the half-bridge unit (1011) includes: When the on-board charger is in charging mode or discharging mode, during the positive half-cycle of the AC power output from the AC power source, the first switch (P1) and the third switch (P3) are controlled to close, and the second switch (P2) and the fourth switch (P4) are controlled to generate complementary waves. During the negative half-cycle of the AC power source, the second switch (P2) and the fourth switch (P4) are controlled to close, and the first switch (P1) and the third switch (P3) are controlled to generate complementary waves.

22. The method according to claim 21, characterized in that, The absorption half-bridge unit (1012) in the on-board charger includes: a fifth switch (clamp1), a sixth switch (clamp2), a seventh switch (clamp3), and an eighth switch (clamp4). The first end of the fifth switch (clamp1) is connected to the first input end of the absorption half-bridge unit (1012), the second end of the fifth switch (clamp1) is connected to the second end of the sixth switch (clamp2), and the first end of the sixth switch (clamp2) is connected to the output end of the absorption half-bridge unit (1012); the first end of the seventh switch (clamp3) is connected to the second input end of the absorption half-bridge unit (1012), the second end of the seventh switch (clamp3) is connected to the second end of the eighth switch (clamp4), and the second end of the eighth switch (clamp4) is connected to the output end of the half-bridge unit (1012); The control of the operating state of the absorption half-bridge unit (1012) includes: When the on-board charger is in charging or discharging mode, during the positive half-cycle of the AC power output, the sixth switch (clamp2) and the eighth switch (clamp4) are controlled to close, and the fifth switch (clamp1) and the seventh switch (clamp3) are controlled to generate complementary waves. During the negative half-cycle of the AC power, the fifth switch (clamp1) and the seventh switch (clamp3) are controlled to close, and the sixth switch (clamp2) and the eighth switch (clamp4) are controlled to generate complementary waves.

23. The method according to claim 22, characterized in that, The secondary circuit (103) in the on-board charger includes a full-bridge unit (1031), which includes a ninth switch (S1), a tenth switch (S2), an eleventh switch (S3), and a twelfth switch (S4). The first terminal of the ninth switch (S1) is connected to the second terminal of the tenth switch (S2) and to the first input terminal of the full-bridge unit (1031). The second terminal of the ninth switch (S1) is connected to the first input terminal of the full-bridge unit (1031). The first output terminal; the first terminal of the tenth switch (S2) is connected to the second output terminal of the full-bridge unit (1031); the first terminal of the eleventh switch (S3) is connected to the second terminal of the twelfth switch (S4), and is also connected to the second input terminal of the full-bridge unit (1031); the second terminal of the eleventh switch (S3) is connected to the first output terminal of the full-bridge unit (1031); the first terminal of the twelfth switch (S4) is connected to the second output terminal of the full-bridge unit (1031). The control of the operating state of the secondary circuit (103) includes: The secondary circuit (103) is controlled to differ from the primary circuit (101) by a first phase angle; The eleventh switch (S3) is controlled to lag the second phase angle of the ninth switch (S1), the twelfth switch (S4) is controlled to lag the second phase angle of the tenth switch (S2), and the ninth switch (S1) and the tenth switch (S2) are controlled to generate complementary waves. The power factor and output power of the on-board charger are modulated according to the first phase angle and the second phase angle.

24. A vehicle, characterized in that, Includes the on-board charger as described in any one of claims 1-19.

Images