Power converter, on-board charger, and vehicle

Abstract

This application relates to a power converter, an on-board charger, and a vehicle, and pertains to the field of power conversion technology. The power converter includes a boost circuit, a half-bridge circuit, and a decoupling circuit. The boost circuit is connected to the energy input terminal; the half-bridge circuit has a midpoint connected to both the boost circuit and the energy output terminal, used to achieve energy conversion between the energy input and output terminals; the decoupling circuit decouples the half-bridge circuit and the boost circuit. The connection of the half-bridge midpoint to the boost circuit and the energy output terminal enables multiplexing of the half-bridge circuit, allowing it to both participate in the boost function to provide a wider voltage adjustment range and simultaneously achieve energy transfer and regulation from the energy input terminal to the energy output terminal. Then, the decoupling circuit is connected to the half-bridge circuit, decoupling the half-bridge circuit and the boost circuit. This allows for wide voltage range adjustment of the power converter.

Description

Technical Field

[0001] This application relates to the field of power conversion technology, and in particular to a power converter, an on-board charger, and a vehicle. Background Technology

[0002] A power converter is an electronic device that can convert one form of electrical energy into another. It can change parameters such as voltage, current, and frequency of the input power supply to meet the requirements of different electrical devices for the form and quality of electrical energy, and realize various types of electrical energy conversion such as AC to DC and DC to DC.

[0003] Currently, power conversion is typically achieved using LLC (LLC Resonant Converter) resonant converters. These converters utilize a resonant network composed of inductors and capacitors to generate resonance at a specific frequency, enabling the switching transistors in the LLC resonant converter to operate under zero-voltage or zero-current switching conditions. This effectively reduces switching losses and improves converter efficiency. However, the voltage gain range of the LLC resonant converter is affected by its resonant characteristics, resulting in a relatively narrow voltage gain range, making it difficult to achieve wide voltage range adjustment. Utility Model Content

[0004] This application provides a power converter that can achieve wide voltage range regulation, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a power converter is provided, comprising:

[0006] A boost circuit is connected to the energy input terminal;

[0007] A half-bridge circuit has a midpoint, which is connected to the boost circuit and the energy output terminal, and is used to realize energy conversion between the energy input terminal and the energy output terminal through the boost circuit;

[0008] A decoupling circuit, connected to the half-bridge circuit, is used to decouple the half-bridge circuit and the boost circuit.

[0009] Optionally, the boost circuit includes a half-bridge arm and a resonant capacitor bank connected in parallel; the energy output terminal includes a first output terminal and a second output terminal; the midpoint of the half-bridge includes the midpoint of the half-bridge arm and the reference midpoint of the resonant capacitor bank.

[0010] The half-bridge arm is connected to the boost circuit and the first output terminal through the midpoint of the arm;

[0011] The resonant capacitor bank is connected to the second output terminal through the reference midpoint.

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

[0013] The first switching transistor includes a first electrode connected to the resonant capacitor bank and the decoupling circuit, a second electrode connected to the boost circuit and the energy output terminal at the midpoint of the bridge arm, and a control electrode for receiving a first control signal;

[0014] The second switching transistor includes a first electrode connected to the midpoint of the bridge arm, a second electrode connected to the energy input terminal, the resonant capacitor bank and the decoupling circuit, and a control electrode for receiving a second control signal;

[0015] The first switch and the second switch are complementary in conduction.

[0016] Optionally, the resonant capacitor bank includes a first capacitor and a second capacitor;

[0017] The first capacitor includes a first end connected to the second electrode of the first switching transistor and a second end connected to the second capacitor and the second output terminal;

[0018] The second capacitor includes a first terminal connected to the first capacitor and the second output terminal, and a second terminal connected to the energy input terminal.

[0019] Optionally, the boost circuit includes a first inductor;

[0020] The first inductor includes a first end connected to the energy input terminal and a second end connected to the midpoint of the bridge arm.

[0021] Optionally, the decoupling circuit includes a third capacitor;

[0022] The third capacitor includes a first end connected to the first switch and the first capacitor, and a second end connected to the second switch and the second capacitor.

[0023] Optionally, it also includes a first converter and a secondary circuit;

[0024] The first terminal of the primary side of the first converter is connected to the first output terminal, the second terminal of the primary side is connected to the second output terminal, and the first terminal of the secondary side and the second terminal of the secondary side are connected to the secondary circuit.

[0025] Optionally, it may also include a second converter and a secondary-side circuit;

[0026] The second converter is a magnetic integrated transformer; the boost circuit is the magnetizing inductor in the magnetic integrated transformer;

[0027] The primary side first terminal of the magnetic integrated transformer is connected to the energy input terminal, the primary side second terminal is connected to the midpoint of the bridge arm, and the secondary side first terminal and the secondary side second terminal are connected to the secondary circuit.

[0028] Optionally, the energy input terminal is connected to an AC signal, and the power converter further includes a power frequency bridge circuit disposed between the half-bridge arm and the resonant capacitor group for rectifying the AC signal;

[0029] The power frequency bridge circuit includes a first diode and a second diode;

[0030] The first diode includes an anode connected to the energy input terminal and the second diode, and a cathode connected to the half-bridge arm, the resonant capacitor bank, and the decoupling circuit;

[0031] The second diode includes an anode connected to the half-bridge arm, the resonant capacitor bank, and the decoupling circuit, and a cathode connected to the energy input terminal and the first diode.

[0032] Optionally, it also includes a feedback control circuit, which is connected to the energy input terminal, the output terminal of the secondary circuit, and the half-bridge arm;

[0033] The feedback control circuit is used to generate a first control signal and a second control signal with opposite phases and complementary according to the signal input to the energy input terminal and the signal output by the secondary circuit, and outputs the first control signal to the first switch and the second control signal to the second switch, so that the first switch and the second switch are complementaryly turned on.

[0034] Optionally, it also includes a DC blocking circuit, which is used to filter out the DC bias voltage in the signal transmitted to the energy output terminal;

[0035] The DC blocking circuit includes a fourth capacitor; the fourth capacitor includes a first end connected to the midpoint of the bridge arm and a second end connected to the first output terminal.

[0036] According to a second aspect of this application, an on-board charger is provided, including the power converter described above.

[0037] According to a third aspect of this application, a vehicle is provided, including the on-board charger described above.

[0038] In summary, in the power converter of this embodiment, the boost circuit is connected to the energy input terminal to increase the voltage input to the energy input terminal. The midpoint of the half-bridge circuit is connected to both the boost circuit and the energy output terminal, realizing the multiplexing of the half-bridge circuit. This allows the half-bridge circuit to participate in the boost function to provide a wider voltage adjustment range, while also realizing the transfer and regulation of energy from the energy input terminal to the energy output terminal. Then, by connecting the decoupling circuit to the half-bridge circuit, the half-bridge circuit and the boost circuit are decoupled from each other, avoiding mutual interference between the boost circuit and the half-bridge circuit. This allows the half-bridge circuit to control the stored and released energy of the boost circuit without being affected by the energy released by the boost circuit. Thus, a wide voltage range adjustment of the power converter can be achieved.

[0039] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0042] Figure 1 This is a schematic diagram of a power converter provided in an exemplary embodiment of this disclosure;

[0043] Figure 2 This is a circuit connection diagram of a power converter provided in an exemplary embodiment of this disclosure;

[0044] Figure 3 This is a current connection diagram of a DC-DC converter provided in an exemplary embodiment of this disclosure;

[0045] Figure 4 This is a current connection diagram of an AC / DC converter provided in an exemplary embodiment of this disclosure;

[0046] Figure 5 This is a circuit connection diagram of an application magnetic integrated transformer provided in an exemplary embodiment of this disclosure;

[0047] Figure 6 This is a schematic diagram of the feedback control circuit provided in an exemplary embodiment of this disclosure;

[0048] Figure 7 This is a waveform diagram of the first control signal and the second control signal provided in an exemplary embodiment of this disclosure;

[0049] Figure 8 This is a waveform diagram of the current of the first and second switching transistors provided in an exemplary embodiment of this disclosure;

[0050] Figure 9 This is a primary-side voltage waveform diagram of a power converter provided in an exemplary embodiment of this disclosure;

[0051] Figure 10 This is a waveform diagram of the resonant cavity current in a power converter provided in an exemplary embodiment of this disclosure.

[0052] Explanation of reference numerals in the attached diagram: 1. Boost circuit; 2. Half-bridge circuit; 21. Half-bridge arm; 22. Resonant capacitor bank; 3. Decoupling circuit; 4. Secondary circuit; 5. Power frequency bridge circuit; 6. Feedback control circuit; 7. DC blocking circuit. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0054] According to the first aspect of this application, referring to Figure 1 This disclosure provides a power converter, including a boost circuit 1, a half-bridge circuit 2, and a decoupling circuit 3. The boost circuit 1 is connected to the energy input terminal; the half-bridge circuit 2 has a midpoint, which is connected to both the boost circuit 1 and the energy output terminal, and is used to achieve energy conversion between the energy input and energy output terminals through the boost circuit 1; the decoupling circuit 3 is connected to the half-bridge circuit 2 and is used to decouple the half-bridge circuit 2 and the boost circuit 1.

[0055] As an example, as the conduction state of the half-bridge circuit 2 switches, the boost circuit 1 will continuously store and release energy. On the one hand, the power transmission and regulation between the energy input and energy output terminals can be realized through the half-bridge circuit 2. On the other hand, the boost function can be realized through the energy release of the boost circuit 1 and the synergistic effect of the half-bridge circuit 2.

[0056] In the above embodiment, boost circuit 1 is connected to the energy input terminal to increase the voltage input to the energy input terminal. The midpoint of half-bridge circuit 2 is connected to both boost circuit 1 and the energy output terminal, realizing the multiplexing of half-bridge circuit 2. This allows half-bridge circuit 2 to both participate in the boost function to provide a wider voltage adjustment range and simultaneously realize the transfer and regulation of energy from the energy input terminal to the energy output terminal. Then, decoupling circuit 3 is connected to half-bridge circuit 2, decoupling half-bridge circuit 2 and boost circuit 1 from each other. This avoids mutual interference between boost circuit 1 and half-bridge circuit 2, allowing half-bridge circuit 2 to control the stored and released energy of boost circuit 1 without being affected by the energy released by boost circuit 1. In this way, a wide voltage range adjustment of the power converter can be achieved.

[0057] Reference Figure 2 In some embodiments, the half-bridge circuit 2 includes a half-bridge arm 21 and a resonant capacitor bank 22 connected in parallel; the energy output terminal includes a first output terminal Out1 and a second output terminal Out2; the midpoint of the half-bridge includes the midpoint A of the half-bridge arm 21 and the reference midpoint B of the resonant capacitor bank 22; the half-bridge arm 21 is connected to the boost circuit 1 and the first output terminal Out1 through the midpoint A; the resonant capacitor bank 22 is connected to the second output terminal Out2 through the reference midpoint B.

[0058] The energy input terminal includes a first input terminal Vin1 and a second input terminal Vin2. The first input terminal Vin1 is connected to the boost circuit 1, and the boost circuit 1 transfers the energy transmitted to the energy input terminal to the midpoint A of the bridge arm. The second input terminal Vin2 is connected to the half-bridge arm 21, the resonant capacitor group 22, and the decoupling circuit 3 to form a complete circuit.

[0059] In the above embodiment, the half-bridge arm 21 and the resonant capacitor group 22, which are arranged in parallel in the half-bridge circuit 2, cooperate with each other. The half-bridge arm 21 is connected to the boost circuit 1 and the first output terminal Out1 through the midpoint A of the arm, so that the half-bridge arm 21 can process and convert the input energy to provide a stable energy output to the first output terminal Out1. The resonant capacitor group 22 is connected to the second output terminal Out2 through the reference midpoint B, and works in conjunction with the half-bridge arm 21 to clamp the half-bridge arm 21, while providing a stable reference point for the second output terminal Out2, so as to realize the energy conversion between the energy input terminal and the energy output terminal.

[0060] In some embodiments, the half-bridge arm 21 includes a first switch Q1 and a second switch Q2; the first switch Q1 includes a first electrode connected to the resonant capacitor group 22 and the decoupling circuit 3, a second electrode connected to the boost circuit 1 and the energy output terminal at the midpoint A of the arm, and a control electrode for receiving the first control signal G1; the second switch Q2 includes a first electrode connected to the midpoint A of the arm, a second electrode connected to the energy input terminal, the resonant capacitor group 22 and the decoupling circuit 3, and a control electrode for receiving the second control signal G2;

[0061] Among them, the first switch Q1 and the second switch Q2 are complementary in conduction.

[0062] In some embodiments, the resonant capacitor group 22 includes a first capacitor C1 and a second capacitor C2; the first capacitor C1 includes a first end connected to the second electrode of the first switch Q1 and a second end connected to the second capacitor C2 and the second output terminal Out2; the second capacitor C2 includes a first end connected to the first capacitor C1 and the second output terminal Out2 and a second end connected to the energy input terminal.

[0063] As an example, since the first capacitor C1 and the second capacitor C2 are connected in series and then in parallel with the half-bridge arm 21, the voltage on the half-bridge arm 21 can be clamped. Simultaneously, by controlling the on / off states of the first switch Q1 and the second switch Q2, the first capacitor C1 and the second capacitor C2 can conduct bidirectionally. For example, if the first switch Q1 is on, causing the second terminal potential of the first capacitor C1 to be higher than its first terminal potential, then the first capacitor C1 conducts in the direction from the reference midpoint B to the first switch Q1. If the second switch Q2 is on, causing the second terminal potential of the geothermal capacitor to be higher than its first terminal potential, then the second capacitor C2 conducts in the direction from the second switch Q2 to the reference midpoint B, thereby changing the conduction direction of the first capacitor C1 and the second capacitor C2.

[0064] In some embodiments, the boost circuit 1 includes a first inductor L1; the first inductor L1 includes a first end connected to the energy input terminal and a second end connected to the midpoint A of the bridge arm.

[0065] As an example, the first inductor L1 enables the storage and release of energy, allowing the energy at the energy input terminal to be stored and released to the midpoint A of the bridge arm, thereby increasing the potential at the midpoint A of the bridge arm and thus widening the adjustable voltage range.

[0066] As an example, since the first inductor L1 is connected to the midpoint A of the bridge arm, the soft switching of the first switch Q1 and the second switch Q2 can be achieved by reversing the current through the zero crossing of the first inductor L1, which is not easily limited by the design of the resonant cavity parameters.

[0067] In some embodiments, the decoupling circuit 3 includes a third capacitor C3; the third capacitor C3 includes a first end connected to the first switch Q1 and the first capacitor C1 and a second end connected to the second switch Q2 and the second capacitor C2.

[0068] As an example, when the first switch Q1 and the second switch Q2 generate high-frequency noise or other interference signals due to switching operations, the third capacitor C3 can absorb and filter out the interference signals using its own capacitive reactance, without affecting the boost circuit 1. Similarly, when the boost circuit 1 generates high-frequency interference signals, the interference signals will be filtered out by the third capacitor C3 because it exhibits low impedance characteristics to high-frequency signals, and will not be directly coupled to the half-bridge arm 21. Thus, through the energy buffering and absorption of interference signals by the third capacitor C3, interference signals are less likely to be transmitted between the boost circuit 1 and the half-bridge arm 21, thereby effectively reducing the electrical coupling between the boost circuit 1 and the half-bridge arm 21, and ultimately achieving decoupling between the boost circuit 1 and the half-bridge circuit 2.

[0069] Reference Figure 3 In some embodiments, the power converter further includes a first converter T1 and a secondary circuit 4; the first terminal of the primary side of the first converter T1 is connected to the first output terminal Out1, the second terminal of the primary side is connected to the second output terminal Out2, and the first terminal of the secondary side and the second terminal of the secondary side are connected to the secondary circuit 4.

[0070] As an example, the secondary circuit 4 is used to rectify and filter the signal output from the secondary side of the first converter T1 to obtain a stable power signal. For example, the secondary circuit 4 may include a rectifier circuit and a filter capacitor. The rectifier circuit is used to rectify the signal output from the secondary side of the first converter T1 into a DC signal. The specific structure of the rectifier circuit is not specifically limited here; for example, the rectifier circuit can be composed of multiple diodes to form a half-wave rectifier, a full-wave rectifier, or a bridge rectifier current. Then, the filter capacitor filters the DC signal output from the rectifier circuit to reduce output ripple.

[0071] In the above embodiment, the boost circuit 1, half-bridge circuit 2, decoupling circuit 3, first converter T1, and secondary circuit 4 constitute a DC-DC converter. The signal input at the energy input terminal is transmitted to the energy output terminal after passing through the boost circuit 1, half-bridge circuit 2, and decoupling circuit 3. Then, it is transmitted to the primary side of the first converter T1 through the energy output terminal. The energy on the primary side is then transmitted to the secondary side through the first converter T1. After rectification and filtering by the secondary side, the energy is output, thereby realizing the DC-DC conversion.

[0072] Reference Figure 4 In some embodiments, the energy input terminal is connected to an AC signal, and the power converter further includes a power frequency bridge circuit 5 disposed between the half-bridge arm 21 and the resonant capacitor group 22 for rectifying the AC signal; the power frequency bridge circuit 5 includes a first diode D1 and a second diode D2; the first diode D1 includes an anode connected to the energy input terminal and the second diode D2 and a cathode connected to the half-bridge arm 21, the resonant capacitor group 22 and the decoupling circuit 3; the second diode D2 includes an anode connected to the half-bridge arm 21, the resonant capacitor group 22 and the decoupling circuit 3 and a cathode connected to the energy input terminal and the first diode D1.

[0073] As an example, when the AC signal is in the positive half-cycle, the AC signal input to the energy input terminal causes the anode potential of the first diode D1 to be higher than the cathode potential, and the first diode D1 conducts. At this time, current flows from the energy input terminal through the anode of the first diode D1 to the cathode, thus providing a positive current path for the half-bridge arm 21, the resonant capacitor group 22, and the decoupling circuit 3, enabling the half-bridge arm 21, the resonant capacitor group 22, and the decoupling circuit 3 to operate normally under the positive half-cycle signal. When the AC signal enters the negative half-cycle, the anode potential of the second diode D2 is higher than the cathode potential, and the second diode D2 conducts. Current flows from the energy input terminal through the anode of the second diode D2 to the cathode, similarly providing current for the half-bridge arm 21, the resonant capacitor group 22, and the decoupling circuit 3, but the current direction is opposite to that of the positive half-cycle. In this way, through the alternating conduction of the first diode D1 and the second diode D2 in the positive and negative half-cycles of the AC signal, the power frequency bridge circuit 5 performs full-wave rectification of the input AC signal, converting the AC signal into a unidirectional DC signal. This allows the half-bridge arm 21, resonant capacitor bank 22, and decoupling circuit 3 to perform energy conversion and regulation based on the DC signal rectified by the power frequency bridge circuit 5. The working principle of the half-bridge arm 21, resonant capacitor bank 22, and decoupling circuit 3 is the same as that without the power frequency bridge circuit 5, and will not be elaborated further here. Thus, when an AC signal is input to the energy input terminal, the power converter can convert the input AC signal into a stable DC signal output, achieving AC-DC conversion.

[0074] Reference Figure 5 In some embodiments, the power converter further includes a second converter T2 and a secondary circuit 4; the second converter T2 is a magnetic integrated transformer; the boost circuit 1 is an excitation inductor in the magnetic integrated transformer; the first terminal of the primary side of the magnetic integrated transformer is connected to the energy input terminal, the second terminal of the primary side is connected to the midpoint A of the bridge arm, and the first terminal and the second terminal of the secondary side are connected to the secondary circuit 4.

[0075] Among them, the first terminal of the primary side of the magnetic integrated transformer is connected to the first input terminal Vin1, and the second input terminal Vin2 is connected to the reference midpoint B of the resonant capacitor group 22.

[0076] In the above embodiment, by connecting the energy input terminal and the midpoint A of the bridge arm through the primary side of the second converter T2, the excitation inductor in the magnetic integrated transformer acts as the boost circuit 1, eliminating the need for an additional inductor and further saving costs.

[0077] Reference Figure 6 In some embodiments, the power converter further includes a feedback control circuit 6, which is connected to the energy input terminal, the output terminal of the secondary circuit 4, and the half-bridge arm 21. The feedback control circuit 6 is used to generate a first control signal G1 and a second control signal G2 with opposite phases and complementary based on the signal Vin input to the energy input terminal and the signal Vout output by the secondary circuit 4. The first control signal G1 is output to the first switch Q1, and the second control signal G2 is output to the second switch Q2, so that the first switch Q1 and the second switch Q2 are complementaryly turned on.

[0078] As an example, the first switch Q1 and the second switch Q2 can be either symmetrically complementary or asymmetrically complementary. Complementary conduction means that at any given time, only one of the first switch Q1 and the second switch Q2 is on. Symmetrical complementary conduction means that the on-time of the first switch Q1 and the second switch Q2 is the same within one cycle, but symmetrical complementary conduction cannot adjust the output power. Asymmetrical complementary conduction means that the on-time of the first switch Q1 and the second switch Q2 is different within one cycle. For example, if the duration of one cycle is T, the on-time of the first switch Q1 can be 0.3T, and the on-time of the second switch Q2 can be 0.7T.

[0079] Reference Figure 7 As an example, the conduction time of the first switch Q1 and the second switch Q2 can be adjusted by changing the duty cycles of the first control signal G1 and the second control signal G2. For instance, taking the conduction time of the first switch Q1 as 0.3T and the conduction time of the second switch Q2 as 0.7T, then the duty cycle of the first control signal G1 is 0.3T, the duty cycle of the second control signal G2 is 0.7T, and the phases of the first control signal G1 and the second control signal G2 are always opposite, so that during operation, only one of the first switch Q1 and the second switch Q2 is in the conducting state at any given time. (Refer to...) Figure 8 , Figure 8 In the diagram, I_Fet1 represents the current waveform of the first switch Q1, and I_Fet2 represents the current waveform of the second switch Q2. It can be seen that the first switch Q1 and the second switch Q2 are alternately complementary in conduction.

[0080] Combination Figure 9 , Figure 9It is a voltage waveform diagram on the first converter T1 or the second converter T2. When the first switch Q1 and the second switch Q2 are asymmetrically complementary, a DC bias voltage will be generated, which will cause the power on the first converter T1 or the second converter T2 to be unbalanced in the positive half-cycle and the negative half-cycle, which will easily lead to the first converter T1 or the second converter T2 exhibiting a bias magnetization phenomenon.

[0081] Combination Figures 3 to 5 Based on this, in some embodiments, the power converter further includes a DC blocking circuit 7, which is used to filter out the DC bias voltage in the signal transmitted to the energy output terminal; the DC blocking circuit 7 includes a fourth capacitor C4; the fourth capacitor C4 includes a first end connected to the midpoint A of the bridge arm and a second end connected to the first output terminal Out1.

[0082] As an example, the fourth capacitor C4 can also be placed on the secondary side of the first converter T1 or the secondary side of the second converter T2, which can also filter out the DC bias voltage.

[0083] The power converter also includes a second inductor Lr, which is connected in series to the first terminal of the primary side of the first converter T1 or the second converter T2. The second inductor Lr can be the leakage inductance of the first converter T1 or the second converter T2, or it can be a separately provided inductor.

[0084] Reference Figure 10 Resonant cavity current 1 represents the resonant current waveform on the second inductor Lr, and resonant cavity current 2 represents the resonant current waveform on the first converter T1 or the second converter T2. It can be seen that after filtering the DC bias voltage through the fourth capacitor C4, the resonant current on the first converter T1 or the second converter T2 is zero, and the resonant current on the second inductor Lr alternates between positive and negative, thus eliminating the magnetization phenomenon.

[0085] According to a second aspect of this disclosure, an on-board charger is provided, which includes the power converter described above. This on-board charger possesses all the beneficial effects of the power converter described above, which will not be elaborated further herein.

[0086] According to a third aspect of this application, a vehicle is provided, including the on-board charger described above.

[0087] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A power converter, characterized in that, include: The boost circuit is connected to the energy input terminal; A half-bridge circuit has a midpoint, which is connected to the boost circuit and the energy output terminal, and is used to realize energy conversion between the energy input terminal and the energy output terminal through the boost circuit; A decoupling circuit, connected to the half-bridge circuit, is used to decouple the half-bridge circuit and the boost circuit.

2. The power converter according to claim 1, characterized in that, The half-bridge circuit includes half-bridge arms and a resonant capacitor bank connected in parallel; the energy output terminal includes a first output terminal and a second output terminal; the midpoint of the half-bridge includes the midpoint of the half-bridge arm and the reference midpoint of the resonant capacitor bank. The half-bridge arm is connected to the boost circuit and the first output terminal through the midpoint of the arm; The resonant capacitor bank is connected to the second output terminal through the reference midpoint.

3. The power converter according to claim 2, characterized in that, The half-bridge arm includes a first switching transistor and a second switching transistor; The first switching transistor includes a first electrode connected to the resonant capacitor bank and the decoupling circuit, a second electrode connected to the boost circuit and the energy output terminal at the midpoint of the bridge arm, and a control electrode for receiving a first control signal; The second switching transistor includes a first electrode connected to the midpoint of the bridge arm, a second electrode connected to the energy input terminal, the resonant capacitor bank and the decoupling circuit, and a control electrode for receiving a second control signal; The first switch and the second switch are complementary in conduction.

4. The power converter according to claim 3, characterized in that, The resonant capacitor bank includes a first capacitor and a second capacitor; The first capacitor includes a first end connected to the second electrode of the first switching transistor and a second end connected to the second capacitor and the second output terminal; The second capacitor includes a first terminal connected to the first capacitor and the second output terminal, and a second terminal connected to the energy input terminal.

5. The power converter according to claim 2, characterized in that, The boost circuit includes a first inductor; The first inductor includes a first end connected to the energy input terminal and a second end connected to the midpoint of the bridge arm.

6. The power converter according to claim 4, characterized in that, The decoupling circuit includes a third capacitor; The third capacitor includes a first end connected to the first switch and the first capacitor, and a second end connected to the second switch and the second capacitor.

7. The power converter according to claim 3, characterized in that, It also includes the first converter and the secondary circuit; The first terminal of the primary side of the first converter is connected to the first output terminal, the second terminal of the primary side is connected to the second output terminal, and the first terminal of the secondary side and the second terminal of the secondary side are connected to the secondary circuit.

8. The power converter according to claim 3, characterized in that, It also includes a second converter and secondary circuitry; The second converter is a magnetic integrated transformer; the boost circuit is the excitation inductor in the magnetic integrated transformer; The primary side first terminal of the magnetic integrated transformer is connected to the energy input terminal, the primary side second terminal is connected to the midpoint of the bridge arm, and the secondary side first terminal and the secondary side second terminal are connected to the secondary circuit.

9. The power converter according to claim 2, characterized in that, The energy input terminal is connected to an AC signal, and the power converter also includes a power frequency bridge circuit disposed between the half-bridge arm and the resonant capacitor group for rectifying the AC signal; The power frequency bridge circuit includes a first diode and a second diode; The first diode includes an anode connected to the energy input terminal and the second diode, and a cathode connected to the half-bridge arm, the resonant capacitor bank, and the decoupling circuit; The second diode includes an anode connected to the half-bridge arm, the resonant capacitor bank, and the decoupling circuit, and a cathode connected to the energy input terminal and the first diode.

10. The power converter according to claim 7 or 8, characterized in that, It also includes a feedback control circuit, which is connected to the energy input terminal, the output terminal of the secondary circuit, and the half-bridge arm; The feedback control circuit is used to generate a first control signal and a second control signal with opposite phases and complementary according to the signal input to the energy input terminal and the signal output by the secondary circuit, and outputs the first control signal to the first switch and the second control signal to the second switch, so that the first switch and the second switch are complementaryly turned on.

11. The power converter according to claim 2, characterized in that, It also includes a DC blocking circuit, which is used to filter out the DC bias voltage in the signal transmitted to the energy output terminal; The DC blocking circuit includes a fourth capacitor; the fourth capacitor includes a first end connected to the midpoint of the bridge arm and a second end connected to the first output terminal.

12. An on-board charger, characterized in that, Includes the power converter according to any one of claims 1 to 11.

13. A vehicle, characterized in that, Includes the on-board charger as described in claim 12.

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