Converter, battery system, control method, electronic device, vehicle, and medium

Abstract

The application discloses a transformer, a battery system, a control method, an electronic device, a vehicle and a medium. The transformer comprises a primary side module and a secondary side module; the secondary side module comprises a resonant conversion circuit and a rectification circuit, the resonant conversion circuit is used for outputting a first voltage, and the rectification circuit is used for outputting a second voltage. In the case that the primary side module is connected with a power supply, different voltages can be output simultaneously to charge different devices to be charged; in the case that the primary side module is not connected with the power supply, the transmission of electric energy between the resonant conversion circuit and the rectification circuit can be realized. In this way, the charging and discharging functions under various working conditions can be applicable, and the production cost is effectively reduced.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and in particular relates to a converter, battery system, control method, electronic device, vehicle, non-transitory computer-readable storage medium and computer program product. Background Technology

[0002] In a vehicle's operating system, the power battery and the storage battery play crucial roles. The power battery provides the primary energy for the vehicle's operation, determining its range and power performance; the storage battery is mainly responsible for powering the vehicle's starting system, onboard electronic equipment, and other components, ensuring the normal operation of all vehicle parts.

[0003] The charging process for power batteries and storage batteries is crucial. In traditional vehicles, these two charging tasks are handled by two separate modules. Each module operates independently, requiring two separate circuits and control systems, which significantly increases costs. Furthermore, each module occupies space, leading to an increase in the overall size of the vehicle and hindering the development of more compact and efficient vehicles. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a converter, battery system, control method, electronic device, vehicle, non-transitory computer-readable storage medium, and computer program product, which can achieve…

[0005] In a first aspect, this application provides a converter including a primary-side module and a secondary-side module; the secondary-side module includes a resonant converter circuit and a rectifier circuit, the resonant converter circuit being used to output a first voltage, and the rectifier circuit being used to output a second voltage.

[0006] In some embodiments, the primary-side module includes a primary-side switching circuit, which is controlled based on pulse frequency modulation and / or pulse width modulation.

[0007] In some embodiments, the resonant converter circuit includes a first secondary-side switching circuit, which is controlled based on pulse frequency modulation and / or pulse width modulation.

[0008] In some embodiments, the rectifier circuit includes a second secondary-side switching circuit, which is controlled based on primary-side and secondary-side phase shift control.

[0009] In some embodiments, the second secondary-side switching circuit includes a first sub-switching circuit and a second sub-switching circuit. Both the first and second sub-switching circuits include multiple switching elements. The multiple switching elements of the first sub-switching circuit are connected in parallel, and the multiple switching elements of the second sub-switching circuit are also connected in parallel.

[0010] In some embodiments, the switching device includes a field-effect transistor, the drains of multiple switching devices in the first sub-switching circuit are connected together, and the sources are connected together; the drains of multiple switching devices in the second sub-switching circuit are connected together, and the sources are connected together.

[0011] In some embodiments, both the first sub-switch circuit and the second sub-switch circuit include three switching devices.

[0012] In some embodiments, the second secondary-side switching circuit further includes a first secondary-side winding, an inductor, and a capacitor. The first sub-switching circuit, the first secondary-side winding, and the second sub-switching circuit are connected in series to form a first loop, and the inductor and capacitor are connected in series to form a first branch. One end of the first branch is connected to the middle position of the first secondary-side winding, and the other end is connected between the first sub-switching circuit and the second sub-switching circuit.

[0013] In some embodiments, the second secondary-side switching circuit further includes a first power supply interface, which is connected in parallel with the capacitor.

[0014] In some embodiments, the converter further includes a magnetic core, the primary-side module includes a primary-side winding, the resonant converter circuit includes a second secondary-side winding, and the rectifier circuit includes a first secondary-side winding. The primary-side winding, the first secondary-side winding, and the second secondary-side winding are respectively wound around different parts of the magnetic core.

[0015] Secondly, this application provides a battery system including the converter and battery in any of the above embodiments.

[0016] Thirdly, this application provides a control method applied to a converter, the converter including a primary-side module and a secondary-side module; the primary-side module includes a first switching element, the secondary-side module includes a resonant converter circuit and a rectifier circuit, the resonant converter circuit is used to output a first voltage, and the rectifier circuit is used to output a second voltage; the resonant converter circuit includes a second switching element, the rectifier circuit includes a third switching element, and the control method includes:

[0017] The first, second, and third switches are controlled to switch the operating modes of the converter, which include at least a charging mode and a discharging mode.

[0018] Fourthly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described control method.

[0019] Fifthly, this application provides a vehicle including the converter and the electronic device described in any of the above embodiments, or the battery system and the electronic device described above.

[0020] Sixthly, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described control method.

[0021] In a seventh aspect, this application provides a computer program product, including a computer program that, when executed by a processor, implements the above-described control method.

[0022] The converter, battery system, control method, electronic device, vehicle, non-transitory computer-readable storage medium, and computer program product provided in this application embodiments, when the primary-side module is connected to a discharge device, allow the resonant converter circuit and rectifier circuit to output different voltages to charge different devices; when the resonant converter circuit is connected to a discharge device, the primary-side module and rectifier circuit can output different voltages to charge different devices. This satisfies the charging and discharging requirements under various operating conditions, effectively reducing the required space and production costs.

[0023] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic diagram of the converter provided in the embodiments of this application;

[0026] Figure 2 This is a schematic diagram of the battery system provided in an embodiment of this application;

[0027] Figure 3 This is a first flowchart illustrating the control method provided in an embodiment of this application;

[0028] Figure 4 This is a second flowchart illustrating the control method provided in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the third process of the control method provided in the embodiments of this application;

[0030] Figure 6 This is a schematic diagram of the control device provided in the embodiments of this application;

[0031] Figure 7 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;

[0032] Figure 8 This is a schematic diagram of the vehicle structure provided in the embodiments of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] Converter 100, primary-side module 10, primary-side switching circuit 11, primary-side winding 12, first switching element 13, first interface 14, first full-bridge circuit 15, first filter capacitor 16, first resonant inductor 17, first magnetizing inductor 18, first resonant capacitor 19, secondary-side module 20, resonant converter circuit 30, first secondary-side switching circuit 31, second secondary-side winding 32, second switching element 33, second interface 34, second full-bridge circuit 35, second filter capacitor 36, second resonant inductor 37, second resonant capacitor 38, rectifier circuit 40, second secondary-side switching circuit 41, first sub-switching circuit 42, second sub-switching circuit 43, switching element 44, first secondary-side winding 45, third switching element 46, inductor 47, capacitor 48, first branch circuit 49, first power supply interface 50, magnetic core 60, battery 110, battery system 200, control device 300, electronic device 400, vehicle 500. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of the embodiments of this application are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, 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. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of a converter provided in an embodiment of this application. The converter 100 will be described in detail below.

[0040] The converter 100 includes a primary-side module 10 and a secondary-side module 20.

[0041] The secondary module 20 includes a resonant converter circuit 30 and a rectifier circuit 40. The resonant converter circuit 30 is used to output a first voltage, and the rectifier circuit 40 is used to output a second voltage.

[0042] The primary side module 10 includes a first interface 14, which can be connected to a discharge device (such as an external power source) or a device to be charged (such as an electrical load); the resonant converter circuit 30 includes a second interface 34, which can be connected to a device to be charged (such as a power battery) or a discharge device (such as a power battery); the rectifier circuit 40 includes a first power supply interface 50, which can be connected to a device to be charged (such as a storage battery or a starting battery).

[0043] When a discharge device is connected to the primary side module 10, the resonant converter circuit 30 outputs a first voltage, and / or the rectifier circuit 40 outputs a second voltage; thus, the device to be charged connected to the second interface 34 can be charged, and / or the device to be charged connected to the first power supply interface 50 can be charged.

[0044] When the resonant converter circuit 30 is connected to a discharge device, the primary side module 10 outputs a corresponding voltage, and / or the rectifier circuit 40 outputs a second voltage; thus, the device to be charged connected to the first interface 14 can be charged, and / or the device to be charged connected to the first power supply interface 50 can be charged.

[0045] The first voltage and the second voltage can be equal or unequal, and the values ​​can be adjusted according to the devices to be charged connected to the resonant converter circuit 30 and the rectifier circuit 40 respectively.

[0046] The voltage conversion processes of the resonant converter circuit 30 and the rectifier circuit 40 do not affect each other.

[0047] In this way, the integration of related charging and discharging equipment effectively reduces the space occupied and production costs.

[0048] In some embodiments, please continue reading Figure 1 The primary-side module 10 includes a primary-side switching circuit 11, which is controlled based on pulse frequency modulation and / or pulse width modulation.

[0049] Pulse Frequency Modulation (PFM) refers to a method of circuit control by changing the frequency of a pulse signal.

[0050] Pulse Width Modulation (PWM) is a method of circuit control that involves changing the duty cycle of a pulse signal.

[0051] The primary-side switching circuit 11 can realize voltage conversion, such as converting DC to AC or AC to DC.

[0052] The output voltage of the primary-side switching circuit 11 is controlled and regulated by PFM and / or PWM, facilitating digital voltage control. This maintains a stable output voltage, reduces energy loss during the conversion process, and improves energy conversion efficiency.

[0053] In some embodiments, please continue reading Figure 1 The primary-side switching circuit 11 includes a first full-bridge circuit 15, a first filter capacitor 16, and a first resonant circuit.

[0054] The first full-bridge circuit 15 includes four switching transistors. The first and second switching transistors are connected in series to form the first bridge arm, and the third and fourth switching transistors are connected in series to form the second bridge arm. The first bridge arm and the second bridge arm are connected in parallel. The first and third switching transistors are connected to one end of the first interface 14, and the second and fourth switching transistors are connected to the other end of the first interface 14.

[0055] Optionally, the switching transistor can be a metal-oxide-semiconductor field-effect transistor (MOSFET), a junction field-effect transistor (JEFT), or other devices. This application does not limit the specific type of transistor used.

[0056] The two ends of the first filter capacitor 16 and the two ends of the first interface 14 are used to smooth the voltage of the primary side module 10 and reduce the ripple in the primary side module 10.

[0057] One end of the first resonant circuit is connected to the midpoint of the first bridge arm (i.e., the connection point between the first and second switching transistors), and the other end is connected to the midpoint of the second bridge arm (i.e., the connection point between the third and fourth switching transistors).

[0058] The first resonant circuit includes a first resonant inductor 17, a first magnetizing inductor 18, and a first resonant capacitor 19 connected in series.

[0059] When the first resonant circuit is in the series resonance stage, the output capacitor of the switching transistor in the first full-bridge circuit 15 is fully charged and discharged, and it has the soft switching conditions of zero voltage turn-on (ZVS) or zero current turn-off (ZCS). This avoids the overlap of voltage and current, thereby significantly reducing the loss of the switching transistor, helping to extend the service life of the switching transistor, and improving the conversion efficiency and reliability with the primary-side switching circuit 11.

[0060] The first resonant circuit can improve the voltage and current waveforms of the primary-side switching circuit 11, improve power quality, and reduce the probability of failure.

[0061] By controlling the on / off state of each switching transistor in the primary-side switching circuit 11 using PFM and / or PWM, voltage conversion can be performed to maintain the stability of the output voltage.

[0062] In some embodiments, please continue reading Figure 1 The resonant converter circuit 30 includes a first secondary-side switching circuit 31, which is controlled based on pulse frequency modulation and / or pulse width modulation.

[0063] The first secondary-side switching circuit 31 can realize voltage conversion, such as converting DC to AC or AC to DC.

[0064] The output voltage of the first secondary-side switching circuit 31 is controlled and regulated by PFM and / or PWM, facilitating digital voltage control. This maintains a stable output voltage, reduces energy loss during the conversion process, and improves energy conversion efficiency.

[0065] In some embodiments, please continue reading Figure 1 The first secondary-side switching circuit 31 includes a second full-bridge circuit 35, a second filter capacitor 36, and a second resonant circuit.

[0066] The second full-bridge circuit 35 includes four switching transistors. The fifth and sixth switching transistors are connected in series to form the third bridge arm, and the seventh and eighth switching transistors are connected in series to form the fourth bridge arm. The third and fourth bridge arms are connected in parallel. The fifth and seventh switching transistors are connected to one end of the second interface 34, and the sixth and eighth switching transistors are connected to the other end of the second interface 34.

[0067] Optionally, the switching transistor can be a metal-oxide-semiconductor field-effect transistor (MOSFET), a junction field-effect transistor (JEFT), or other devices. This application does not limit the specific type of transistor used.

[0068] The two ends of the second filter capacitor 36 and the two ends of the second interface 34 are used to smooth the voltage of the resonant converter circuit 30 and reduce the ripple in the resonant converter circuit 30.

[0069] One end of the second resonant circuit is connected to the midpoint of the third bridge arm (i.e., the connection point between the fifth and sixth switches), and the other end is connected to the midpoint of the fourth bridge arm (i.e., the connection point between the seventh and eighth switches).

[0070] The second resonant circuit includes a second resonant inductor 37 and a second resonant capacitor 38 connected in series.

[0071] When the second resonant circuit is in the series resonance stage, the output capacitor of the switching transistor in the second full-bridge circuit 35 is fully charged and discharged, and it has the soft switching conditions of zero voltage turn-on (ZVS) or zero current turn-off (ZCS). This avoids the overlap of voltage and current, thereby significantly reducing the loss of the switching transistor, helping to extend the service life of the switching transistor, and improving the conversion efficiency and reliability with the primary-side switching circuit 11.

[0072] The second resonant circuit can improve the voltage and current waveforms of the first secondary-side switching circuit 31, improve power quality, and reduce the probability of failure.

[0073] By controlling the on / off state of each switch in the first secondary-side switching circuit 31 using PFM and / or PWM, voltage conversion can be performed to maintain the stability of the output voltage.

[0074] In some embodiments, please continue reading Figure 1 The rectifier circuit 40 includes a second secondary-side switching circuit 41, which is controlled based on the phase shift control of the primary and secondary sides.

[0075] Primary and secondary side phase shift control (PS) refers to the control of parameters such as output voltage by shifting the phase of voltage or current in the primary side module 10 and rectifier circuit 40.

[0076] PS features soft-switching characteristics, which can effectively reduce switching losses and adjust the output voltage over a wide range, providing flexible control and strong power transmission capability.

[0077] In some embodiments, please continue reading Figure 1 The second sub-side switch circuit 41 includes a first sub-switch circuit 42 and a second sub-switch circuit 43. Both the first sub-switch circuit 42 and the second sub-switch circuit 43 include multiple switching elements 44. The multiple switching elements 44 of the first sub-switch circuit 42 are connected in parallel, and the multiple switching elements 44 of the second sub-switch circuit 43 are connected in parallel.

[0078] The multiple switches 44 in the first sub-switch circuit 42 are connected in parallel to shunt the current in the first sub-switch circuit 42, reducing the current in each switch 44, thereby reducing the heat loss of each switch 44 and improving the charging efficiency and safety of the rectifier circuit 40.

[0079] The multiple switches 44 in the second sub-switch circuit 43 have the same effect when connected in parallel, and will not be described again here to avoid repetition.

[0080] Optionally, the switching device can be a metal-oxide-semiconductor field-effect transistor (MOSFET), a junction field-effect transistor (JEFT), or other similar devices. This application does not limit the specific device used in this embodiment.

[0081] In some embodiments, please continue reading Figure 1 The switching devices include field-effect transistors. The drains of multiple switching devices 44 in the first sub-switching circuit 42 are connected together, and the sources are connected together. The drains of multiple switching devices 44 in the second sub-switching circuit 43 are connected together, and the sources are connected together.

[0082] This achieves the effect of current diversion, reduces the heat loss of each switching component, extends the service life of each switching component, and improves the charging efficiency of the rectifier circuit 40.

[0083] In some embodiments, please continue reading Figure 1 Preferably, both the first sub-switch circuit 42 and the second sub-switch circuit 43 include three switching elements 44. In this way, the current shunting effect is achieved, while avoiding the circuit complexity and increased cost caused by using multiple switching elements 44.

[0084] In some embodiments, please continue reading Figure 1 The second secondary-side switching circuit 41 also includes a first secondary-side winding 45, an inductor, and a capacitor. The first sub-switching circuit 42, the first secondary-side winding 45, and the second sub-switching circuit 43 are connected in series to form a first loop. The inductor and capacitor are connected in series to form a first branch 49. One end of the first branch 49 is connected to the middle position of the first secondary-side winding, and the other end is connected between the first sub-switching circuit 42 and the second sub-switching circuit 43.

[0085] The first branch 49 enables each switch in the second secondary switching circuit 41 to have ZVS or ZCS soft switching conditions, effectively reducing the losses of each switch and improving the conversion efficiency of the rectifier circuit 40. At the same time, it filters the output voltage, reduces voltage ripple and noise, and improves the stability of the output voltage.

[0086] In some embodiments, please continue reading Figure 1 The second auxiliary switch circuit 41 also includes a first power supply interface 50, which is connected in parallel with a capacitor.

[0087] The first power supply interface 50 is used to connect the device to be charged. When the device to be charged is connected to the first power supply interface 50, the capacitor is connected in parallel with the device to be charged, which plays a filtering role and ensures the stability of the voltage entering the device to be charged.

[0088] In some embodiments, please continue reading Figure 1 The converter 100 also includes a magnetic core 60, a primary side module 10 including a primary side winding 12, a resonant converter circuit 30 including a second secondary side winding 32, and a rectifier circuit 40 including a first secondary side winding 45. The primary side winding 12, the first secondary side winding 45, and the second secondary side winding 32 are respectively wound around different parts of the magnetic core 60.

[0089] The primary winding 12 is connected in parallel with the first magnetizing inductor 18 in the first resonant circuit of the primary switching circuit 11; one end of the second secondary winding 32 is connected to the second resonant capacitor 38 in the resonant converter circuit 30, and the other end is connected to the second resonant inductor 37; the two ends of the first secondary winding 45 are respectively connected to the first sub-switching circuit 42 and the second sub-switching circuit 43 in the rectifier circuit 40.

[0090] When the primary-side module 10 is connected to a discharge device, the electrical energy of the discharge device is converted into alternating current through the primary-side switching circuit 11 and transmitted to the primary-side winding 12. The primary-side winding 12 generates a magnetic field due to the change in alternating current. The magnetic core 60 has high permeability, which can concentrate and guide the magnetic field generated by the primary-side winding 12 to the first secondary-side winding 45 and the second secondary-side winding 32. The first secondary-side winding 45 and the second secondary-side winding 32 generate induced electromotive forces based on the change in the magnetic flux passing through them, forming currents in the resonant conversion circuit and the rectifier circuit 40, respectively. This realizes the transfer of electrical energy from the primary-side module 10 to the resonant conversion circuit and the rectifier circuit 40.

[0091] In some embodiments, please continue reading Figure 1 The converter 100 provided in this application embodiment has multiple operating states, which are described in detail below.

[0092] In the first full-bridge circuit 15 of the primary-side module 10 and the second full-bridge circuit 35 of the resonant converter circuit 30, each switch typically operates near the resonant frequency to reduce the switching losses of each switch, reduce heat generation, extend the service life of each switch, reduce energy loss during transmission, and thus improve the efficiency of the entire converter 100.

[0093] When the voltage of the first magnetizing inductor 18 is clamped by the output voltage of the resonant converter circuit 30 or the rectifier circuit 40, the resonant frequency satisfies the following relationship:

[0094]

[0095] Among them, L r1 C is the inductance value of the first resonant inductor 17. r1 This is the capacitance value of the first resonant capacitor 19.

[0096] When the first magnetizing inductor 18 participates in resonance, the resonant frequency satisfies the following relationship:

[0097]

[0098] Among them, L r1 L is the inductance value of the first resonant inductor 17. m C is the inductance value of the first magnetizing inductor 18. r1 This is the capacitance value of the first resonant capacitor 19.

[0099] In the first full-bridge circuit 15 of the primary-side module 10 and the second full-bridge circuit 35 of the resonant converter circuit 30, each switching element in the rectifier circuit 40 is a MOSFET. When the primary-side module 10 supplies power to the resonant converter circuit and the rectifier circuit 40, the operating states are as follows:

[0100] Operating State 1: When the first resonant inductor 17, the first resonant capacitor 19, and the first magnetizing inductor 18 are in the series resonance stage, the output capacitor of the switching transistor is fully charged and discharged. After the drain-source voltage of the first and fourth switching transistors drops to zero, the body diode is turned on, and the ZVS soft-switching condition is met.

[0101] Operating State 2: With the first and fourth switching transistors conducting, ZVS soft switching is achieved. The primary-side module 10 transfers energy to the secondary-side module 20. The body diodes in the sixth and seventh switching transistors and each switching element of the second sub-switching circuit 43 are turned on, the output voltage of the secondary-side module 20 is clamped, the first magnetizing inductor 18 exits series resonance, and the resonant current on the first resonant inductor 17 begins to decrease.

[0102] Operating state 3: When the resonant current in the first resonant inductor 17 drops to zero and begins to reverse, the voltage on the first resonant capacitor 19 reaches its maximum value, and the primary side module 10 continues to transfer energy to the secondary side module 20.

[0103] Operating State 4: When the excitation current in the primary module 10 is equal to the resonant current, the current in the second resonant circuit and the first branch 49 in the secondary module 20 drops to zero. The body diodes in the sixth switch, the seventh switch, and the second sub-switch circuit 43 achieve ZCS turn-off. The output voltage in the secondary module 20 loses its clamping effect, and the first resonant inductor 17, the first resonant capacitor 19, and the first excitation inductor 18 enter the series resonant state.

[0104] Operating State 5: When the first resonant inductor 17, the first resonant capacitor 19, and the first magnetizing inductor 18 are in the series resonance stage, the output capacitors of the second and third switching transistors are fully charged and discharged. After the drain-source voltage of the second and third switching transistors drops to zero, the body diode is turned on, thus meeting the ZVS soft-switching conditions.

[0105] Operating State 6: With the second and third switches on, ZVS soft switching is achieved. Primary-side module 10 transfers energy to secondary-side module 20. The fifth and eighth switches, and the body diode in the first switching circuit, are turned on. The output voltage of secondary-side module 20 is clamped, the first magnetizing inductor 18 exits series resonance, and the resonant current on the first resonant inductor 17 begins to decrease. Operating State 7: With the resonant current in the first resonant inductor 17 dropping to zero and starting to reverse, the voltage on the first resonant capacitor 19 reaches its maximum value, and primary-side module 10 continues to transfer energy to secondary-side module 20.

[0106] Operating State 8: When the excitation current in the primary module 10 is equal to the resonant current, the current in the second resonant circuit and the first branch 49 in the secondary module 20 drops to zero. The fifth switch, the eighth switch and the body diode in the first switching circuit achieve ZCS turn-off. The voltage of the secondary transformer loses its clamping effect. The first resonant inductor 17, the first resonant capacitor 19 and the first excitation inductor 18 re-enter the series resonant state.

[0107] When the primary-side module 10 charges the resonant switching circuit or the rectifier circuit 40 alone, or when the resonant switching circuit charges the primary-side module 10 and / or the rectifier circuit 40, the various operating states of the converter 100 are the same as the process principles of the operating states 1-8 described above. To avoid repetition, they will not be described again here.

[0108] This application embodiment also provides a battery system 200, which includes the converter 100 and battery 110 from any of the above embodiments. In some embodiments, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the battery system provided in an embodiment of this application. The battery system 200 includes a converter 100 and batteries 110. When the converter 100 is connected to an external discharge device, the converter 100 can charge at least one of the two connected batteries 110. When the converter 100 is connected to an external device to be charged, the converter 100 can transfer power from one battery 110 to the external device to be charged, and / or to the other battery 110. To avoid repetition, further details are omitted here.

[0109] Based on the above description of the converter and battery system, this application provides a control method applied to the converter 100. The control method is described in detail below:

[0110] Please see Figure 3 The control method provided in this application embodiment is implemented by step 011, which is described in detail below.

[0111] Step 011: Control the on / off state of the first, second, and third switching devices to switch the operating mode of the converter.

[0112] The operating modes include at least a charging mode and a discharging mode.

[0113] The charging modes include single-output charging mode and dual-output charging mode; the single-output charging mode includes powering the resonant converter circuit or rectifier circuit through the primary-side module, and the dual-output charging mode includes powering the resonant converter circuit and rectifier circuit through the primary-side module.

[0114] The discharge modes include single-output discharge mode and dual-output discharge mode; the single-output discharge mode includes discharging the primary-side module or rectifier circuit through the resonant converter circuit, and the dual-output discharge mode includes discharging the primary-side module and rectifier circuit through the resonant converter circuit.

[0115] Specifically, when the first interface of the primary-side module is connected to a charging / discharging device (such as a portable power supply or electrical load), the second interface of the resonant rectifier circuit is connected to a charging / discharging device (such as a power battery), and the first power supply interface of the rectifier circuit is connected to a device to be charged (such as a storage battery or starting battery), by controlling the on / off state of the first, second, and third switches, it is possible to control whether the primary-side module, the resonant converter circuit, and the rectifier circuit participate in power transmission, thereby corresponding to different operating modes.

[0116] In this way, the required working modes under different conditions can be met, thus improving the versatility of the converter.

[0117] In some embodiments, please refer to Figure 4Optionally, step 011 includes:

[0118] Step 0111: Control the first, second, and third switches to turn on, so as to switch to a dual-output charging mode that supplies power to the resonant converter circuit and the rectifier circuit.

[0119] Specifically, in charging mode, when the first, second, and third switches are turned on, the primary-side module simultaneously transfers electrical energy to both the resonant converter circuit and the rectifier circuit. Each switch in the first full-bridge circuit of the primary-side module is controlled by PFM and / or PWM. The output voltage range of the first full-bridge circuit is relatively large. The switching pulses of the first and fourth switches are identical, as are the switching pulses of the second and third switches.

[0120] When using the PFM control strategy, the duty cycle of each switch in the first full-bridge circuit is fixed, and the switching frequency is adjusted. The difference between the output voltage of the resonant converter circuit and the preset first target voltage is calculated, and then the frequency adjustment is obtained by closed-loop calculation through a proportional-integral (PI) regulator.

[0121] When the output voltage of the resonant converter circuit is relatively large and the PFM control reaches its adjustment limit (based on the preset upper limit value of the parameters in the primary-side module), a PWM control strategy is adopted to fix the frequency of each switching transistor in the first full-bridge circuit and adjust the duty cycle. The difference between the output voltage of the resonant converter circuit and the preset first target voltage is calculated, and then the duty cycle adjustment is obtained by closed-loop calculation through a PI regulator.

[0122] When the output voltage of the resonant converter circuit is low and the PWM control reaches its adjustment limit (not meeting the requirements within the preset duty cycle range), the PFM control strategy is used again. This achieves smooth switching between PFM and PWM, allowing the output voltage of the resonant converter circuit and rectifier circuit to rise smoothly during startup. This reduces the stress on the individual switches in the first full-bridge circuit, ensuring maximum transmission efficiency while achieving a wide range of variable voltage values, thus improving power transmission efficiency and charging process stability.

[0123] In the second full-bridge circuit of the resonant converter, each switch adopts a control strategy that is synchronized with the switches in the first full-bridge circuit, or no control strategy is adopted, and automatic rectification is achieved through the body diode inside the switch (with poor performance).

[0124] The switching devices in the first and second sub-switching circuits of the rectifier circuit employ a PS control strategy. The switching pulses of all switching devices in the first sub-switching circuit are identical, and the switching pulses of all switching devices in the second sub-switching circuit are also identical.

[0125] The difference between the output voltage of the rectifier circuit and the preset second target voltage (e.g., 13.8V) is calculated, and then a closed-loop operation is performed through a PI regulator to obtain the phase shift adjustment amount. The phase shift adjustment amount is used to adjust the various switching components in the rectifier circuit, so that the rectifier circuit can stably output the second target voltage and avoid output voltage runaway.

[0126] Step 0112: Control the first and second switches to be turned on, and the third switch to be turned off, so as to switch to the single-output charging mode that supplies power to the resonant converter circuit;

[0127] Specifically, in charging mode, the first and second switches are turned on, and the third switch is turned off, allowing the primary-side module and the resonant converter circuit to participate in power transfer. PFM and / or PWM control strategies are used to control the individual switches in the first full-bridge circuit of the primary-side module, synchronously controlling or not controlling the individual switches in the second full-bridge circuit of the resonant converter circuit, so that the output voltage of the second interface of the resonant converter circuit is stabilized at the required first target voltage.

[0128] Step 0113: Control the first and third switches to be turned on, and the second switch to be turned off, so as to switch to a single-output charging mode that supplies power to the rectifier circuit;

[0129] Specifically, in charging mode, the first and third switches are turned on, and the second switch is turned off, allowing the primary-side module and rectifier circuit to participate in power transfer. PFM and / or PWM control strategies are used to control the individual switches in the first full-bridge circuit of the primary-side module, and PS control strategies are used to control the individual switches in the rectifier circuit, ensuring that the output voltage of the first power supply interface of the rectifier circuit is stabilized at the required second target voltage (e.g., 13.8V).

[0130] In some embodiments, please refer to Figure 5 Optionally, step 011 further includes:

[0131] Step 0114: Control the first, second, and third switches to conduct, so as to switch to a dual-output discharge mode that discharges to the primary side module and the rectifier circuit.

[0132] Specifically, in discharge mode, the first, second, and third switching devices are turned on, and the primary-side module, resonant converter circuit, and rectifier circuit all participate in power transfer. PFM and / or PWM control strategies are used to control each switch in the second full-bridge circuit of the resonant converter circuit, synchronously controlling or not controlling each switch in the first full-bridge circuit of the primary-side module. PS control strategies are used to control each switch in the rectifier circuit, so that the output voltage of the first interface of the primary-side module is stabilized at the required voltage, and the output voltage of the first power supply interface of the rectifier circuit is stabilized at the required second target voltage (e.g., 13.8V).

[0133] Step 0115: Control the first and second switching devices to be turned on, and the third switching device to be turned off, so as to switch to the single-output discharge mode of discharging to the primary side module;

[0134] Specifically, in discharge mode, the first and second switches are turned on, and the third switch is turned off, allowing the primary-side module and the resonant converter circuit to participate in power transfer. PFM and / or PWM control strategies are used to control the individual switches in the second full-bridge circuit of the resonant converter circuit, synchronously controlling or not controlling the individual switches in the first full-bridge circuit of the primary-side module, so that the output voltage of the first interface of the primary-side module is stabilized at the required voltage.

[0135] Step 0116: Control the second and third switching devices to be turned on, and the first switching device to be turned off, so as to switch to the single-output discharge mode for discharging to the rectifier circuit;

[0136] Specifically, in discharge mode, the first and third switches are turned on, and the second switch is turned off, allowing the resonant converter circuit and rectifier circuit to participate in power transfer. PFM and / or PWM control strategies are used to control the individual switches in the second full-bridge circuit of the resonant converter circuit, and PS control strategies are used to control the individual switches in the rectifier circuit. The output voltage of the first power supply interface of the rectifier circuit is stabilized to the required second target voltage (e.g., 13.8V).

[0137] This can extend the lifespan of the converter and improve the efficiency of power transmission and the stability of the charging and discharging process.

[0138] Based on the method described in the above embodiments, this application also provides a control device 300 for executing the steps in the above control method. Please refer to... Figure 6 , Figure 6 This is a schematic diagram of a control device 300 provided in an embodiment of this application. The control device 300 includes:

[0139] The control module 301 is used to control the on / off state of the first switch, the second switch and the third switch to switch the working mode of the converter. The working mode includes at least a charging mode and a discharging mode.

[0140] It should be noted that the specific details of each module unit in the above control device have been described in detail in the embodiments of the above control method, and will not be repeated here.

[0141] In this application embodiment, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0142] In some embodiments, the control device in this application can be implemented in hardware, such as an electronic device or a component in an electronic device, such as an integrated circuit or a chip; the control device can also be implemented in software, such as as an application installed in an electronic device.

[0143] In some embodiments, please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. The electronic device 400 includes a processor 401 and a memory 402. The memory 402 stores a computer program 403 that can run on the processor 401. When the processor 401 executes the program 403, it implements the various processes of the embodiments of the above-described control method and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0144] This application also provides a vehicle, which includes the converter and electronic device described in any of the above embodiments, or the battery system and electronic device described above. In some embodiments, please refer to... Figure 8 , Figure 8 This is a schematic diagram of the vehicle structure provided in an embodiment of this application. The vehicle 500 includes a battery system 200 and an electronic device 400. When the electronic device 400 is executed, it implements the various processes of the embodiments of the above-described control method and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0145] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0146] The processor can be the processor in the electronic device described in the above embodiments. The computer-readable storage medium can be a computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc.

[0147] Computer-readable media can include computer storage media and communication media. Computer storage media includes volatile and non-volatile, removable and non-removable media implemented using any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include RAM, ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other solid-state storage technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape cassettes, magnetic tape, disk storage, or other magnetic storage devices. Of course, those skilled in the art will recognize that computer storage media are not limited to the above-mentioned types.

[0148] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described control method. The processor may be a processor in the electronic device described in the above embodiments. When executed by the processor, the computer program implements the various processes of the embodiments of the above-described control method and achieves the same technical effects; therefore, to avoid repetition, further details are omitted here.

[0149] It is understood that in the specific implementation of this application, data related to user identity or characteristics is involved. When the above embodiments of this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0150] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0151] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0152] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A converter, characterized in that, include: Primary edge module; and The secondary-side module includes a resonant converter circuit and a rectifier circuit. The resonant converter circuit is used to output a first voltage, and the rectifier circuit is used to output a second voltage.

2. The converter according to claim 1, characterized in that, The primary-side module includes a primary-side switching circuit, which is controlled based on pulse frequency modulation and / or pulse width modulation.

3. The converter according to claim 1 or 2, characterized in that, The resonant converter circuit includes a first secondary-side switching circuit, which is controlled based on pulse frequency modulation and / or pulse width modulation.

4. The converter according to claim 1 or 2, characterized in that, The rectifier circuit includes a second secondary-side switching circuit, which is controlled based on the phase shift control of the primary and secondary sides.

5. The converter according to claim 4, characterized in that, The second secondary-side switching circuit includes a first sub-switching circuit and a second sub-switching circuit. Both the first and second sub-switching circuits include multiple switching elements. The multiple switching elements of the first sub-switching circuit are connected in parallel, and the multiple switching elements of the second sub-switching circuit are also connected in parallel.

6. The converter according to claim 5, characterized in that, The switching device includes a field-effect transistor. The drains of multiple switching devices in the first sub-switching circuit are connected together, and the sources are connected together. The drains of multiple switching devices in the second sub-switching circuit are connected together, and the sources are connected together.

7. The converter according to claim 5 or 6, characterized in that, Both the first sub-switch circuit and the second sub-switch circuit include three switching devices.

8. The converter according to claim 5, characterized in that, The second secondary-side switching circuit also includes a first secondary-side winding, an inductor, and a capacitor. The first sub-switching circuit, the first secondary-side winding, and the second sub-switching circuit are connected in series to form a first loop. The inductor and capacitor are connected in series to form a first branch. One end of the first branch is connected to the middle position of the first secondary-side winding, and the other end is connected between the first sub-switching circuit and the second sub-switching circuit.

9. The converter according to claim 8, characterized in that, The second secondary-side switching circuit also includes a first power supply interface, which is connected in parallel with the capacitor.

10. The converter according to claim 1, characterized in that, The converter also includes a magnetic core, the primary side module includes a primary side winding, the resonant converter circuit includes a second secondary side winding, and the rectifier circuit includes a first secondary side winding. The primary side winding, the first secondary side winding, and the second secondary side winding are respectively wound around different parts of the magnetic core.

11. A battery system, characterized in that, Includes the converter and battery as described in any one of claims 1-10.

12. A control method, characterized in that, The invention is applied to a converter, which includes a primary-side module and a secondary-side module. The primary-side module includes a first switching device, and the secondary-side module includes a resonant converter circuit and a rectifier circuit. The resonant converter circuit is used to output a first voltage, and the rectifier circuit is used to output a second voltage. The resonant converter circuit includes a second switching element, the rectifier circuit includes a third switching element, and the method includes: The first, second, and third switches are controlled to switch the operating modes of the converter, which include at least a charging mode and a discharging mode.

13. The control method according to claim 12, characterized in that, The charging modes include a single-output charging mode and a dual-output charging mode; the single-output charging mode includes powering the resonant converter circuit or rectifier circuit through the primary-side module, and the dual-output charging mode includes powering the resonant converter circuit and rectifier circuit through the primary-side module.

14. The control method according to claim 13, characterized in that, The control of the on / off states of the first, second, and third switches to switch the operating mode of the converter includes: The first and second switches are turned on, and the third switch is turned off, so as to switch to a single-output charging mode that supplies power to the resonant converter circuit; The first and third switches are turned on, and the second switch is turned off, so as to switch to a single-output charging mode that supplies power to the rectifier circuit; The first, second, and third switches are controlled to be turned on, so as to switch to a dual-output charging mode that supplies power to the resonant converter circuit and the rectifier circuit.

15. The control method according to claim 12, characterized in that, The discharge modes include a single-output discharge mode and a dual-output discharge mode; the single-output discharge mode includes discharging the primary-side module or rectifier circuit through the resonant converter circuit, and the dual-output discharge mode includes discharging the primary-side module and rectifier circuit through the resonant converter circuit.

16. The control method according to claim 15, characterized in that, The control of the on / off states of the first, second, and third switches to switch the operating mode of the converter includes: The first and second switches are turned on, and the third switch is turned off, so as to switch to a single-output discharge mode that discharges to the primary side module; The second and third switches are turned on while the first switch is turned off, so as to switch to a single-output discharge mode that discharges to the rectifier circuit. The first, second, and third switches are controlled to be turned on, so as to switch to a dual-output discharge mode that discharges to the primary-side module and the rectifier circuit.

17. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the control method as described in any one of claims 12-16.

18. A vehicle comprising the converter of any one of claims 1-10 and the electronic device of claim 17; or, the battery system of claim 11 and the electronic device of claim 17.

19. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 12-16.

20. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the control method as described in any one of claims 12-16.

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