Charge and discharge circuit

Abstract

The present application relates to the application field of new energy technology, and in particular to a charging and discharging circuit, which includes: a power factor correction module, configured to receive an initial voltage, and output a processing voltage after correcting the initial voltage; a voltage conversion module, configured to receive the processing voltage, and output a charging and discharging voltage after voltage conversion of the processing voltage; a control module, configured to determine a target voltage value based on the charging and discharging voltage, and adjust the power factor correction module so that the processing voltage meets the target voltage value; the charging and discharging circuit provided in the embodiment of the present application is used to provide a converter structure that can adapt to the output requirements of a wide voltage range.

Description

Technical Field

[0001] The present application relates to the field of new energy technology applications, and in particular to a charging and discharging circuit. Background Art

[0002] With the rapid development of new energy, the application of power batteries is becoming more and more extensive, especially in electric vehicles and small drones.

[0003] Among them, the battery voltage variation range of power batteries is getting wider and wider, and the LLC topology has obvious advantages in efficiency, volume and power density compared with other topologies, so it has been widely used and studied. Due to the adjustment frequency range and working characteristics of the LLC topology, the output gain of the LLC topology is small, and it is difficult to cope with power batteries with a wide voltage variation range.

[0004] Simple frequency modulation control cannot meet the output requirements of the LLC topology for a wide voltage range. The hybrid modulation strategy combining frequency modulation with pulse width modulation can meet the output requirements of the LLC topology for a wide voltage range, but it cannot fully achieve zero voltage switching (Zero Voltage Switch, ZVS) at low voltage output, which leads to reduced efficiency of the LLC topology and difficulty in meeting the temperature design requirements. Therefore, it is necessary to design a converter structure that can adapt to the output requirements of a wide voltage range. Summary of the invention

[0005] The purpose of the present application is to provide a charging and discharging circuit to provide a converter structure that can adapt to output requirements in a wide voltage range.

[0006] To achieve the above-mentioned purpose, the present application proposes a charging and discharging circuit, comprising: a power factor correction module, configured to receive an initial voltage, and output a processing voltage after correcting the initial voltage; a voltage conversion module, configured to receive the processing voltage, and output a charging and discharging voltage after voltage conversion of the processing voltage; a control module, configured to determine a target voltage value based on the charging and discharging voltage, and adjust the power factor correction module so that the processing voltage meets the target voltage value.

[0007] In some embodiments, the control module includes: a first control unit connected to the voltage conversion module, the first control unit is configured to obtain the charging and discharging voltages, and determine the target voltage value based on the charging and discharging voltages; a second control unit connected to the first control unit and the power factor correction module, the second control unit is configured to adjust the power factor correction module based on the target voltage value so that the processing voltage meets the target voltage value.

[0008] In some embodiments, the target voltage value is used to configure the voltage conversion module to operate in a zero voltage turn-on state.

[0009] In some embodiments, the control module is further used to obtain charging and discharging currents, and is configured to determine the target voltage value based on the charging and discharging currents and the charging and discharging voltages.

[0010] In some embodiments, the charge and discharge current, the charge and discharge voltage, and the target voltage value satisfy the following relationship: V0=A*Vout+B*Iout+C, wherein V0 is the target voltage value, Vout is the charge and discharge voltage, Iout is the charge and discharge current, A is the first coefficient, B is the second coefficient, and C is the third coefficient.

[0011] In some embodiments, the first control unit also dynamically adjusts the first coefficient, the second coefficient and the third coefficient based on the working state of the voltage conversion module.

[0012] In some embodiments, the power factor correction module includes at least one correction unit connected in parallel, each correction unit is used to receive the initial voltage, and the at least one correction unit connected in parallel jointly outputs the processed voltage.

[0013] In some embodiments, the correction unit includes: a full-bridge component, including a positive terminal, a negative terminal and a midpoint input terminal, the midpoint input terminal is used to receive the initial voltage; a first inductor, a first end of which is connected to the positive terminal of the full-bridge component; a first switch tube, a first end of which is connected to the second end of the first inductor, a second end of which is connected to the negative terminal of the full-bridge component, and a control end of which is connected to the control module; a diode, an input end of which is connected to the second end of the first inductor; a first capacitor, a first end of which is connected to the output end of the diode, and a second end of which is connected to the second end of the full-bridge component.

[0014] In some embodiments, the control module adjusts the process voltage by controlling a duty cycle of the first switch tube.

[0015] In some embodiments, the voltage conversion module includes at least an isolation unit, and the isolation unit is arranged based on an LLC topology.

[0016] The technical solution of the present invention has the following beneficial effects:

[0017] The charge and discharge circuit provided in the embodiment of the present application obtains the target voltage value through charge and discharge voltage feedback, and adjusts the power factor correction module so that the processing voltage meets the target voltage value. At this time, the processing voltage input to the voltage conversion module and the charge and discharge voltage output meet the preset gain ratio. The preset gain ratio is maintained in a relatively small range, so that the voltage conversion module can maintain a relatively narrow operating frequency transformer under a wider output voltage requirement, so that the voltage conversion module can be in an ideal working state.

[0018] In addition, the ideal working state of the voltage conversion module is the zero voltage switch (Zero Voltage Switch, ZVS) state. The zero voltage switch state can ensure that the loss of the voltage conversion module is minimized.

[0019] In addition, by dynamically adjusting the first coefficient, the second coefficient and the third coefficient, it is ensured that the voltage conversion module can operate in a zero voltage turn-on state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the structure of a charging and discharging circuit provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a control module provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a correction unit provided in an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of the isolation unit provided in an embodiment of the present application.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] As can be seen from the background technology, simple frequency modulation control cannot meet the output requirements of the LLC topology for a wide voltage range. Although the hybrid modulation strategy combining frequency modulation and pulse width modulation can meet the output requirements of the LLC topology for a wide voltage range, it cannot fully achieve zero voltage switching (Zero Voltage Switch, ZVS) at low voltage output, which leads to reduced efficiency of the LLC topology and difficulty in meeting the temperature design requirements.

[0027] In order to solve the above problems, this embodiment proposes a charging and discharging circuit, including: a power factor correction module, configured to receive an initial voltage, and output a processing voltage after correcting the initial voltage; a voltage conversion module, configured to receive the processing voltage, and output a charging and discharging voltage after voltage conversion of the processing voltage; a control module, configured to determine a target voltage value based on the charging and discharging voltage, and adjust the power factor correction module so that the processing voltage meets the target voltage value.

[0028] The charge and discharge circuit provided in the embodiment of the present application obtains the target voltage value through charge and discharge voltage feedback, and adjusts the power factor correction module so that the processing voltage meets the target voltage value. At this time, the processing voltage input to the voltage conversion module and the charge and discharge voltage output meet the preset gain ratio. The preset gain ratio is maintained in a relatively small range, so that the voltage conversion module can maintain a relatively narrow operating frequency transformer under a wider output voltage requirement, so that the voltage conversion module can be in an ideal working state.

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The charge and discharge circuit provided in this embodiment is described in detail below in conjunction with the accompanying drawings. Figure 1 , Figure 1 This is a schematic diagram of the structure of the charging and discharging circuit provided in this embodiment.

[0032] The charge and discharge circuit 100 includes a power factor correction module 101 , a voltage conversion module 102 and a control module 103 .

[0033] The power factor correction module 101 is configured to receive an initial voltage Vin, and output a processed voltage Vbus after correcting the initial voltage Vin.

[0034] The power factor is defined as the ratio of the energy that the device can transmit to the output terminal to the total energy it obtains from the input power supply. In one example, the power factor correction module 101 is based on a power factor correction circuit (Power Factor Correction, PFC), and the power factor correction circuit (PFC) is used to improve the power factor of the charging and discharging circuit.

[0035] The voltage conversion module 102 is configured to receive a processing voltage Vbus, and perform voltage conversion on the processing voltage Vbus to output a charge-discharge voltage Vout.

[0036] Specifically, the voltage conversion module 102 is used for voltage conversion between an input voltage and an output voltage; wherein the voltage conversion includes but is not limited to DC-DC conversion, DC-AC conversion, AC-DC conversion and AC-AC conversion.

[0037] The control module 103 is configured to determine a target voltage value based on the charge and discharge voltage Vout, and adjust the power factor correction module 101 so that the processing voltage Vbus meets the target voltage value.

[0038] Based on the foregoing description, it can be known that when the charge and discharge voltage Vout needs to vary over a wide range, the gain brought by the frequency modulation of the voltage conversion module 102 alone cannot be satisfied in the optimal state. The charge and discharge circuit 100 provided in this embodiment monitors the charge and discharge voltage Vout and adjusts the processing voltage Vbus accordingly, so that the gain ratio of the charge and discharge voltage Vout to the processing voltage Vbus is always maintained in a relatively narrow range, thereby achieving a relatively narrow operating frequency transformation under a wider output voltage requirement, so that the voltage conversion module 102 can be designed in an ideal working state.

[0039] In some embodiments, the voltage conversion module 102 is further used to process the voltage isolation between the voltage Vbus and the charge and discharge voltage Vout, wherein the voltage isolation means that there is no direct connection line between the input path and the output path.

[0040] In some embodiments, the ideal working state of the voltage conversion module 102 is a zero voltage switch (Zero Voltage Switch, ZVS) state. The zero voltage switch state can ensure that the loss of the voltage conversion module 102 is minimized. Accordingly, in this embodiment, the target voltage value is used to configure the voltage conversion module 102 to work in the zero voltage switch state.

[0041] Based on the above example, it can be known that the control module 103 determines the target voltage value based on the charge and discharge voltage Vout.

[0042] In some embodiments, the control module 103 is further used to obtain the charge and discharge current Iout, and is configured to determine the target voltage value based on the charge and discharge current Iout and the charge and discharge voltage Vout. In other embodiments, the control module 103 can also obtain the target voltage value based only on the charge and discharge current Iout.

[0043] In one example, if the control module 103 determines the target voltage value V0 based on the charge and discharge voltage Vout, the charge and discharge voltage Vout and the target voltage value V0 satisfy the following relationship:

[0044] V0=A1*Vout+C1

[0045] Among them, A1 is the first coefficient and C1 is the third coefficient.

[0046] In one example, if the control module 103 determines the target voltage value V0 based on the charge and discharge current Iout, the charge and discharge current Iout and the target voltage value V0 satisfy the following relationship:

[0047] V0=B1*Iout+C2

[0048] Among them, B1 is the second coefficient and C2 is the third coefficient.

[0049] In one example, if the control module 103 determines the target voltage value V0 based on the charge and discharge voltage Vout and the charge and discharge current Iout, the charge and discharge voltage Vout, the charge and discharge current Iout and the target voltage value V0 satisfy the following relationship:

[0050] V0=A2*Vout+B2*Iout+C3

[0051] Among them, A2 is the first coefficient, B2 is the second coefficient, and C3 is the third coefficient.

[0052] Specifically, the first coefficient A (including A1 and A2), the second coefficient B (including B1 and B2) and the third coefficient C (including C1, C2 and C3) are used to configure the voltage conversion module 102 to operate in a zero voltage turn-on state.

[0053] In some embodiments, the control module 103 also dynamically adjusts the first coefficient, the second coefficient, and the third coefficient based on the working state of the voltage conversion module 102. By dynamically adjusting the first coefficient, the second coefficient, and the third coefficient, it is ensured that the voltage conversion module 102 can operate in a zero voltage switching (ZVS) state.

[0054] Taking a charging circuit with a charging power of 2-3.3kw as an example, the charging and discharging voltage Vout, the charging and discharging current Iout and the target voltage value V0 satisfy V0=6*Vout+4*Iout+85.

[0055] It should be noted that the examples of the above specific parameters are only used to reflect a specific relationship between a charging and discharging voltage Vout, a charging and discharging current Iout and a target voltage value V0, and do not constitute a limitation on this embodiment. In other applications, it can be determined according to the actual application scenario of the voltage conversion module 102.

[0056] In some embodiments, the control module 103 may be configured based on a microcontroller unit (MCU); in other embodiments, the control module 103 may be configured based on a digital signal processing (DSP) chip.

[0057] refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the control module provided in this embodiment. In some embodiments, the control module 103 includes a first control unit 201 and a second control unit 202.

[0058] The first control unit 201 is connected to the voltage conversion module 102 , and the first control unit 201 is configured to obtain the charge and discharge voltage Vout, and determine a target voltage value based on the charge and discharge voltage Vout.

[0059] The second control unit 202 is connected to the first control unit and the power factor correction module 101 . The second control unit 202 is configured to adjust the power factor correction module 101 based on the target voltage value so that the processing voltage Vbus meets the target voltage value.

[0060] Based on the foregoing, it can be known that in some embodiments, the first control unit 201 can also be configured to obtain the charging and discharging current Iout, and determine the target voltage value based on the charging and discharging current Iout; in other embodiments, the first control unit 201 can also be configured to obtain the charging and discharging current Iout and the charging and discharging voltage Vout, and determine the target voltage value based on the charging and discharging current Iout and the charging and discharging voltage Vout.

[0061] Specifically, the first control unit 201 determines the target voltage value based on at least one of the first coefficient A, the second coefficient B and the third coefficient C. In some embodiments, the first coefficient A, the second coefficient B and the third coefficient C can be adjusted according to actual applications to match actual parameters of the voltage conversion module 102 .

[0062] Accordingly, in some embodiments, the first control unit 201 may be arranged based on a microcontroller unit (MCU); in other embodiments, the first control unit 201 may be arranged based on a digital signal processing technology (DSP) chip.

[0063] Accordingly, in some embodiments, the second control unit 202 may be arranged based on a microcontroller unit (MCU); in other embodiments, the second control unit 202 may be arranged based on a digital signal processing technology (DSP) chip.

[0064] Regarding the power factor correction module 101 , in some embodiments, the power factor correction module 101 includes at least one correction unit connected in parallel, each correction unit is used to receive an initial voltage Vin, and the at least one correction unit connected in parallel jointly outputs a processing voltage Vbus.

[0065] For calibration units, refer to Figure 3 , Figure 3 The structural diagram of the correction unit provided in this embodiment, the correction unit comprises: a full-bridge component, including a positive terminal, a negative terminal and a midpoint input terminal, the midpoint input terminal is used to receive the initial voltage Vin; a first inductor L B , the first end is connected to the positive terminal of the full-bridge component; the first switch tube Q1, the first end is connected to the first inductor L B The second end of the diode D is connected to the negative end of the full-bridge component, and the control end is connected to the control module 103; B , the input end is connected to the first inductor L B The second end of the first capacitor Co, the first end of which is connected to the diode D B The output end of the device is connected to the second end of the full-bridge component.

[0066] for Figure 3 The full-bridge assembly shown in the figure includes diodes D1, D2, D3 and D4, and the full-bridge assembly is used to realize AC to DC conversion, so as to convert the initial voltage Vin of AC into DC voltage. In some embodiments, the diodes D1, D2, D3 and D4 can be replaced by switch tubes, that is, the full-bridge assembly forms a bridge arm based on the switch tube.

[0067] for Figure 3 The working principle of the correction unit shown is as follows: when the control terminal of the first switch tube Q1 is at a high level, the first switch tube Q1 is turned on, which is equivalent to a short circuit of the branch where the first switch tube Q1 is located. At this time, the first inductor L B The first end of the first inductor L is connected to the positive terminal of the full-bridge component.B The second end of the full-bridge assembly is connected to the negative end, and the initial voltage Vin is applied to the first inductor L B The first inductor L B The first end of the first inductor L B The second end of the inductor is negatively charged. As time goes by, the B The current of diode D B Reverse cutoff is equivalent to open circuit. At this time, the first capacitor Co discharges to the first load resistor Ro. As time goes by, the voltage across the first capacitor Co decreases continuously, that is, the output voltage of the correction unit decreases continuously.

[0068] When the control terminal of the first switch tube Q1 is at a low level, the first switch tube Q1 is turned off, which is equivalent to breaking the branch where the first switch tube Q1 is located. At this time, the first inductor L B The polarity of the first inductor L B The first end of the first inductor L is negatively charged. B The second end of the diode D is positively charged. B The first inductor L B discharge, over time, through the first inductor L B The current decreases continuously, the initial voltage Vin and the first inductance L B The voltage across both ends charges the first capacitor Co and supplies power to the first load resistor Ro at the same time. As time goes by, the voltage across both ends of the first capacitor Co increases continuously, that is, the output voltage of the correction unit increases continuously.

[0069] Therefore, by controlling the duty cycle of the first switch tube Q1 , the output voltage of the correction unit can be adjusted.

[0070] It should be noted that Figure 3 The first switch tube Q1 shown is an NMOS tube, which does not constitute a limitation on this embodiment. In some embodiments, the first switch tube Q1 can be set to a PMOS tube. In this case, the first switch tube Q1 is turned on based on a low level.

[0071] In some embodiments, the correction unit further includes a first load resistor Ro, a first end of the first load resistor Ro is connected to a diode D B The output end of the first load resistor Ro is connected to the second end of the full-bridge component.

[0072] In some embodiments, the control module 103 adjusts the processing voltage Vbus by controlling the duty cycle of the first switch tube Q1. In one example, the second control unit 202 controls the duty cycle of the first switch tube Q1 to adjust the processing voltage Vbus through a control signal.

[0073] Based on the foregoing description, the parallel correction units output a processing voltage Vbus, and by controlling the duty cycle of the first switch tube Q1, the output voltage of the correction unit can be adjusted. Therefore, the processing voltage Vbus can be adjusted by controlling the duty cycle of the first switch tube Q1.

[0074] In some embodiments, the voltage conversion module 102 includes at least an isolation unit, and the isolation unit is configured based on an LLC topology.

[0075] Specifically, for the charging and discharging circuit, the first stage is a power factor correction circuit (PFC), which converts the initial voltage Vin of the AC into a stable processing voltage Vbus, and completes the power factor correction at the same time. The processing voltage Vbus is used as the input of the second stage voltage conversion module 102 based on the LLC topology. The control module 103 controls and monitors the operation of the first stage power factor correction circuit (PFC) and the second stage voltage conversion module 102 based on the LLC topology.

[0076] For the isolation unit of LLC topology, in some embodiments, reference Figure 4 The isolation unit includes: a second switch tube Q2 and a third switch tube Q3, wherein the first end of the third switch tube Q3 is connected to the second end of the second switch tube Q2 to form a control bridge arm, and the control end of the second switch tube Q2 and the control end of the third switch tube Q3 are connected to the control module 103. The first end of the second switch tube Q2 and the second end of the third switch tube Q3 serve as input ends of the isolation unit, and are used to receive the input voltage of the voltage conversion module 102, that is, the processing voltage Vbus; the second capacitor Cr, the first end of which is connected to the second end of the second switch tube Q2, the second inductor Lr, the first end of which is connected to the second end of the second capacitor Cr, and the second end of which is connected to the transformer. The transformer includes a primary coil Lm and a secondary coil, wherein the first end of the primary coil Lm is connected to the second end of the second inductor Lr, and the second end of the primary coil Lm is connected to the second end of the third switch tube Q3; the secondary coil includes a first end, a second end and a coil midpoint; the fourth switch tube SR1, wherein the first end is connected to the first end of the secondary coil; the fifth switch tube SR2, wherein the first end is connected to the second end of the secondary coil, and the second end is connected to the second end of the fourth switch tube SR1, and the control end of the fourth switch tube SR1 and the control end of the fifth switch tube SR2 are connected to the control module 103 to form a secondary rectifier circuit. The third capacitor Co, wherein the first end is connected to the coil midpoint of the secondary coil, and the second end is connected to the second end of the fifth switch tube SR2; the second load resistor Rload, wherein the first end is connected to the first end of the third capacitor Co, and the second end is connected to the second end of the third capacitor Co.

[0077] The voltage across the second load resistor Rload is the output voltage of the isolation unit, that is, the charge-discharge voltage Vout output by the voltage conversion module 102 .

[0078] In some embodiments, the control end of the second switch tube Q2 and the control end of the third switch tube Q3 are connected to the first control unit 201; the control end of the fourth switch tube SR1 and the control end of the fifth switch tube SR2 are also connected to the first control unit 201. The first control unit 201 controls the second switch tube Q2 and the third switch tube Q3 so that the voltage conversion module 102 converts the processing voltage Vbus into a charge and discharge voltage Vout.

[0079] It should be noted that Figure 4 The LLC topology shown does not constitute a limitation on the isolation unit and the voltage conversion module 102 .

[0080] The charge and discharge circuit provided in the embodiment of the present application obtains the target voltage value through charge and discharge voltage feedback, and adjusts the power factor correction module so that the processing voltage meets the target voltage value. At this time, the processing voltage input to the voltage conversion module and the charge and discharge voltage output meet the preset gain ratio. The preset gain ratio is maintained in a relatively small range, so that the voltage conversion module can maintain a relatively narrow operating frequency transformer under a wider output voltage requirement, so that the voltage conversion module can be in an ideal working state.

[0081] It should also be noted that, in the absence of conflict, the features disclosed in the charge and discharge circuits provided in the above embodiments can be randomly combined to obtain new charge and discharge circuit embodiments.

[0082] Accordingly, an embodiment of the present application also provides a control method, which is applied to the charging and discharging circuit provided in the above embodiment, including: obtaining the charging and discharging voltage output by the voltage conversion module; determining the target voltage value based on the charging and discharging voltage; and adjusting the power factor correction module based on the target voltage value so that the processed voltage output by the power factor correction module meets the target voltage value.

[0083] Regarding the method for obtaining the target voltage value, in one example, if the target voltage value V0 is determined based on the charge and discharge voltage Vout, the charge and discharge voltage Vout and the target voltage value V0 satisfy the following relationship:

[0084] V0=A1*Vout+C1

[0085] Among them, A1 is the first coefficient and C1 is the third coefficient.

[0086] In some embodiments, the control method further includes: acquiring the charge and discharge current output by the current conversion module; and determining the target voltage value based on the charge and discharge voltage and the charge and discharge current.

[0087] Regarding the method for obtaining the target voltage value, in one example, if the target voltage value V0 is determined based on the charge and discharge voltage Vout and the charge and discharge current Iout, the charge and discharge voltage Vout, the charge and discharge current Iout and the target voltage value V0 satisfy the following relationship:

[0088] V0=A2*Vout+B2*Iout+C3

[0089] Among them, A2 is the first coefficient, B2 is the second coefficient, and C3 is the third coefficient.

[0090] In some embodiments, the target voltage value may also be determined directly based on the charge and discharge current.

[0091] Regarding the method for obtaining the target voltage value, in one example, if the target voltage value V0 is determined based on the charge and discharge current Iout, the charge and discharge current Iout and the target voltage value V0 satisfy the following relationship:

[0092] V0=B1*Iout+C2

[0093] Among them, B1 is the second coefficient and C2 is the third coefficient.

[0094] Specifically, the first coefficient A (including A1 and A2), the second coefficient B (including B1 and B2) and the third coefficient C (including C1, C2 and C3) are used to configure the voltage conversion module 102 to operate in a zero voltage turn-on state.

[0095] In some embodiments, the first coefficient, the second coefficient and the third coefficient are dynamically adjusted based on the working state of the voltage conversion module 102. By dynamically adjusting the first coefficient, the second coefficient and the third coefficient, it is ensured that the voltage conversion module 102 can work in a zero voltage switching (ZVS) state.

[0096] Taking a charging circuit with a charging power of 2-3.3kw as an example, the charging and discharging voltage Vout, the charging and discharging current Iout and the target voltage value V0 satisfy V0=6*Vout+4*Iout+85.

[0097] Regarding the method for adjusting the power factor correction module based on the target voltage value, the processing voltage Vbus is adjusted by controlling the duty cycle of the switch tube in the power factor correction module.

[0098] The control method provided in the embodiment of the present application obtains the target voltage value through charging and discharging voltage feedback, and adjusts the power factor correction module so that the processing voltage meets the target voltage value. At this time, the processing voltage input to the voltage conversion module and the charging and discharging voltage output meet the preset gain ratio. The preset gain ratio is maintained in a relatively small range, so that the voltage conversion module can maintain a relatively narrow operating frequency transformer under a wider output voltage requirement, so that the voltage conversion module can be in an ideal working state.

[0099] Correspondingly, an embodiment of the present application also provides an electronic device, comprising the charging and discharging circuit provided by the above embodiment.

[0100] The exclusive right of the electronic device has all the beneficial effects of the above-mentioned minimum protection subject, which will not be described in detail in this application. The electronic device can be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, a drone, etc., which is not specifically limited in this application.

[0101] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0102] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0103] The above is a detailed introduction to a charging and discharging circuit provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A charging and discharging circuit, characterized in that: include: A power factor correction module is configured to receive an initial voltage, correct the initial voltage, and output a processed voltage; A voltage conversion module is configured to receive the processing voltage, perform voltage conversion on the processing voltage, and then output a charge and discharge voltage; The control module is configured to determine a target voltage value based on the charge and discharge voltage, and adjust the power factor correction module so that the processing voltage meets the target voltage value.

2. The charge and discharge circuit according to claim 1, characterized in that: The control module comprises: a first control unit connected to the voltage conversion module, wherein the first control unit is configured to obtain the charge and discharge voltages and determine the target voltage value based on the charge and discharge voltages; A second control unit is connected to the first control unit and the power factor correction module, and the second control unit is configured to adjust the power factor correction module based on the target voltage value so that the processing voltage meets the target voltage value.

3. The charge and discharge circuit according to claim 1, characterized in that: The target voltage value is used to configure the voltage conversion module to operate in a zero voltage turn-on state.

4. The charge and discharge circuit according to claim 1, characterized in that: The control module is further used to obtain the charge and discharge current, and is configured to determine the target voltage value based on the charge and discharge current and the charge and discharge voltage.

5. The charge and discharge circuit according to claim 4, characterized in that: The charge and discharge current, the charge and discharge voltage, and the target voltage value satisfy the following relationship: V0=A*Vout+B*Iout+C Among them, V0 is the target voltage value, Vout is the charge and discharge voltage, Iout is the charge and discharge current, A is the first coefficient, B is the second coefficient, and C is the third coefficient.

6. The charge and discharge circuit according to claim 5, characterized in that: The control module includes a first control unit connected to the voltage conversion module, and the first control unit is configured to obtain the charge and discharge voltages, and determine the target voltage value based on the charge and discharge voltages; The first control unit also dynamically adjusts the first coefficient, the second coefficient and the third coefficient based on the working state of the voltage conversion module.

7. The charge and discharge circuit according to claim 1, characterized in that: The power factor correction module includes at least one correction unit connected in parallel, each correction unit is used to receive the initial voltage, and the at least one correction unit connected in parallel jointly outputs the processed voltage.

8. The charge and discharge circuit according to claim 7, characterized in that: The correction unit comprises: A full-bridge component, comprising a positive terminal, a negative terminal and a midpoint input terminal, wherein the midpoint input terminal is used to receive the initial voltage; A first inductor, a first end of which is connected to the positive terminal of the full-bridge component; A first switch tube, wherein a first end is connected to the second end of the first inductor, a second end is connected to the negative end of the full-bridge component, and a control end is connected to the control module; A diode, an input end of which is connected to the second end of the first inductor; A first capacitor has a first end connected to the output end of the diode and a second end connected to the second end of the full-bridge component.

9. The charge and discharge circuit according to claim 8, characterized in that: The control module adjusts the processing voltage by controlling the duty cycle of the first switch tube.

10. The charge and discharge circuit according to claim 1, wherein: The voltage conversion module at least includes an isolation unit, and the isolation unit is arranged based on an LLC topology.

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