Charging and discharging circuit, charging and discharging device and vehicle

Abstract

The invention discloses a charging and discharging circuit, a charging and discharging device and a vehicle, the charging and discharging circuit comprises a first direct current conversion module and a second direct current conversion module, the first direct current conversion module comprises a plurality of bridge arms and a first transformer, and each bridge arm is connected with a coil of the first transformer; the charging and discharging module is used for charging and discharging a first battery; and the second direct current conversion module is connected with the midpoints of at least part of the bridge arms in the plurality of bridge arms and is used for charging and discharging the second battery. According to the charging and discharging circuit provided by the embodiment of the invention, the number of the power devices in the circuit can be reduced by increasing the number of the multiplexed power devices in the circuit, and the volume and the cost of an integrated circuit can be reduced on the whole.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a charging and discharging circuit, a charging and discharging device and a vehicle. Background Art

[0002] In the prior art, the topology of a two-in-one vehicle power supply product is usually composed of a front-stage PFC (Power Factor Correction) circuit connected to a rear-stage LLC (Inductor-Inductor-Capacitor, resonant circuit), the output of which is connected to a power battery, and then the power battery is connected to a DCDC (DC-to-DC converter, direct current converter) conversion circuit, and the output of the DCDC conversion circuit is connected to a storage battery, thereby realizing power supply for the vehicle-mounted power battery and storage battery by an external power supply.

[0003] In the prior art, during the charging and discharging process of the vehicle power battery and the storage battery, it is necessary to simultaneously control the operation of the front-stage PFC circuit, the rear-stage LLC and the DCDC conversion circuit. There are relatively few reused power devices in the entire circuit, so it is inevitable to use more power devices to meet different charging and discharging requirements. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present invention is to provide a charging and discharging circuit, which can reduce the number of power devices in the circuit by increasing the number of power devices reused in the circuit, which is conducive to reducing the volume and cost of the integrated circuit as a whole.

[0005] The second object of the present invention is to provide a charging and discharging device.

[0006] A third object of the present invention is to provide a vehicle.

[0007] In order to achieve the above-mentioned purpose, a first embodiment of the present invention proposes a charging and discharging circuit, comprising: a first DC conversion module, the first DC conversion module comprising a plurality of bridge arms and a first transformer, each of the plurality of bridge arms being respectively connected to a coil of the first transformer, for charging and discharging a first battery; a second DC conversion module, the second DC conversion module being connected to a midpoint of at least some of the plurality of bridge arms, for charging and discharging a second battery.

[0008] According to the charge and discharge circuit proposed in the embodiment of the present invention, by connecting the second DC conversion module to the midpoint of at least part of the multiple bridge arms of the first primary circuit unit in the first DC conversion module, that is, by reusing part of the bridge arms in the first DC conversion module, the output voltage of the second DC conversion module can be adjusted, so that the charge and discharge circuit can not only meet the charge and discharge requirements of the first battery and the second battery, but also reduce the number of power devices in the circuit by increasing the number of power devices reused in the circuit, thereby being conducive to reducing the size of the integrated circuit and reducing the cost as a whole.

[0009] In some embodiments of the present invention, the first DC conversion module includes: a first primary circuit unit, the first primary circuit unit includes a plurality of first bridge arms, the plurality of first bridge arms respectively have a first midpoint, and the first midpoint is connected to the primary coil of the first transformer; a first secondary circuit unit, the first secondary circuit unit is connected to the first battery, the first secondary circuit unit includes a plurality of second bridge arms, the plurality of second bridge arms respectively have a second midpoint, and the second midpoint is connected to the secondary coil of the first transformer.

[0010] In some embodiments of the present invention, the second DC conversion module includes: a second primary circuit unit, the second primary circuit unit is connected to the first midpoint or the second midpoint, and is used to adjust the output voltage of the second DC conversion module; a second transformer, the primary coil of the second transformer is connected to the second primary circuit unit; and a second secondary circuit unit, the second secondary circuit unit is connected to the secondary coil of the second transformer and the second battery.

[0011] In some embodiments of the present invention, the second primary circuit unit includes: a first switch tube and a second switch tube, at least one of the first switch tube and the second switch tube is connected to the first midpoint or the second midpoint, and at least one of the first switch tube and the second switch tube is connected to the primary coil of the second transformer.

[0012] In some embodiments of the present invention, the first primary circuit unit includes two first bridge arms, and the two first bridge arms have two first midpoints; the first secondary circuit unit includes two second bridge arms, and the two second bridge arms have two second midpoints.

[0013] In some embodiments of the present invention, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the second end of the primary coil of the second transformer is connected to one of the two first midpoints, the drain of the first switching tube is connected to the drain of the second switching tube, and the source of the second switching tube is connected to the other of the two first midpoints; or, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the second end of the primary coil of the second transformer is connected to one of the two second midpoints, the drain of the first switching tube is connected to the drain of the second switching tube, and the source of the second switching tube is connected to the other of the two second midpoints.

[0014] In some embodiments of the present invention, the source of the first switch tube is connected to one of the two first midpoints, the drain of the first switch tube is connected to the first end of the primary coil of the second transformer, the source of the second switch tube is connected to the other of the two first midpoints, and the drain of the second switch tube is connected to the second end of the primary coil of the second transformer; or, the source of the first switch tube is connected to one of the two second midpoints, the drain of the first switch tube is connected to the first end of the primary coil of the second transformer, the source of the second switch tube is connected to the other of the two second midpoints, and the drain of the second switch tube is connected to the second end of the primary coil of the second transformer.

[0015] In some embodiments of the present invention, the drain of the first switching tube is connected to one of the two first midpoints, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the drain of the second switching tube is connected to the other of the two first midpoints, and the source of the second switching tube is connected to the second end of the primary coil of the second transformer; or, the drain of the first switching tube is connected to one of the two second midpoints, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the drain of the second switching tube is connected to the other of the two second midpoints, and the source of the second switching tube is connected to the second end of the primary coil of the second transformer.

[0016] In some embodiments of the present invention, the first primary circuit unit includes: a third switch tube and a fourth switch tube, the third switch tube is connected to the fourth switch tube; a fifth switch tube and a sixth switch tube, the fifth switch tube is connected to the third switch tube and the sixth switch tube, and the sixth switch tube is connected to the fourth switch tube; wherein, the first midpoint is respectively provided between the third switch tube and the fourth switch tube and between the fifth switch tube and the sixth switch tube, and the two first midpoints are connected to the two ends of the primary coil of the first transformer.

[0017] In some embodiments of the present invention, the first secondary circuit unit includes: a seventh switch tube and an eighth switch tube, the seventh switch tube is connected to the eighth switch tube, and the seventh switch tube is connected to the first end of the first battery; a ninth switch tube and a tenth switch tube, the ninth switch tube is connected to the seventh switch tube, the tenth switch tube, and the first end of the first battery, the tenth switch tube is connected to the eighth switch tube and the second end of the first battery, and the two ends of the first battery are connected to a first capacitor; wherein, the second midpoint is respectively provided between the seventh switch tube and the eighth switch tube and between the ninth switch tube and the tenth switch tube, and the two second midpoints are connected to the two ends of the secondary coil of the first transformer.

[0018] In some embodiments of the present invention, the secondary coil of the second transformer includes multiple coils, and the first end of each coil is connected to the first end of the second battery through an inductor; the second secondary circuit unit includes multiple switching tubes, and the second end of each coil is connected to the second end of the second battery through a corresponding one of the multiple switching tubes.

[0019] In some embodiments of the present invention, the secondary coil of the second transformer includes a first secondary coil and a second secondary coil, the first ends of the first secondary coil and the second secondary coil are connected together as a coil common end, and the coil common end is connected to the first end of the second battery through the inductor; the second secondary circuit unit includes an eleventh switching tube and a twelfth switching tube, the second end of the first secondary coil is connected to the second end of the second battery through the eleventh switching tube, and the second end of the second secondary coil is connected to the second end of the second battery through the twelfth switching tube.

[0020] In some embodiments of the present invention, within a control cycle, the third switch tube, the sixth switch tube, the seventh switch tube and the tenth switch tube are turned on and turned off synchronously, and the fourth switch tube, the fifth switch tube, the eighth switch tube and the ninth switch tube are turned on and turned off synchronously, and after reserving a preset percentage of dead zone, the timing of the switch tube in the first primary circuit unit and the switch tube in the first secondary circuit unit are complementary.

[0021] In some embodiments of the present invention, the first switch tube and the second switch tube are turned on alternately.

[0022] In some embodiments of the present invention, when the third switch tube and the sixth switch tube are both turned on, the second switch tube is turned on and the first switch tube is turned off, the eleventh switch tube is turned on and the twelfth switch tube is turned off; or, when the fourth switch tube and the fifth switch tube are both turned on, the first switch tube is turned on and the second switch tube is turned off, the twelfth switch tube is turned on and the eleventh switch tube is turned off.

[0023] In some embodiments of the present invention, the duty cycles of the third switch tube and the sixth switch tube are both the first duty cycle, the duty cycle of the second switch tube is the second duty cycle, and the first duty cycle is greater than the second duty cycle; the output voltage of the second DC conversion module is adjusted by adjusting the size of the first duty cycle and the second duty cycle.

[0024] In some embodiments of the present invention, the duty cycles of the seventh switch tube and the tenth switch tube are both the third duty cycle, the duty cycle of the second switch tube is the second duty cycle, and the third duty cycle is greater than the second duty cycle; the output voltage of the second DC conversion module is adjusted by adjusting the third duty cycle and the second duty cycle.

[0025] In some embodiments of the present invention, the charging and discharging circuit also includes: a power factor correction module, the input end of the power factor correction module is suitable for inputting an AC power signal, and the output end of the power factor correction module is connected to the input end of the first DC conversion module for converting the AC power signal into a DC power signal.

[0026] In order to achieve the above-mentioned purpose, the second aspect of the present invention proposes a charging and discharging device, comprising: the charging and discharging circuit described in any one of the above embodiments; an AC port, a first DC port and a second DC port, the AC port is connected to the input end of the power factor correction module of the charging and discharging circuit, the first DC port is connected to the output end of the first DC conversion module of the charging and discharging circuit, and the second DC port is connected to the output end of the second DC conversion module of the charging and discharging circuit.

[0027] The charging and discharging device proposed in the embodiment of the present invention, by adopting the charging and discharging circuit of any of the above embodiments and reusing the power devices in the charging and discharging circuit, can not only meet the charging and discharging requirements of different vehicle batteries, but also reduce the number of power devices in the charging and discharging circuit by increasing the number of reused power devices in the circuit, thereby helping to reduce the size of the charging and discharging device as a whole and reduce the cost.

[0028] In some embodiments of the present invention, the charging and discharging device further includes: a controller, which is connected to the charging and discharging circuit and is used to control the switch tube in the charging and discharging circuit according to a preset timing.

[0029] In order to achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention further proposes a vehicle, comprising: a first battery and a second battery, wherein the power supply capacity of the second battery is lower than the power supply capacity of the first battery; and the charging and discharging device described in the above embodiment, wherein the first DC port of the charging and discharging device is connected to the first battery, and the second DC port of the charging and discharging device is connected to the second battery.

[0030] The vehicle proposed according to the embodiment of the present invention, by adopting the charging and discharging device of any of the above embodiments and reusing the power devices in the charging and discharging circuit, can not only meet the charging and discharging requirements of the first battery and the second battery, but also help to reduce the volume of the integrated circuit in the whole vehicle and reduce the cost of the whole vehicle.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 This is a structural diagram of a two-in-one vehicle power supply in the prior art;

[0034] Figure 2 A circuit diagram of a two-in-one vehicle power supply in the prior art;

[0035] Figure 3 is a block diagram of a charge and discharge circuit according to an embodiment of the present invention;

[0036] Figure 4 is a block diagram of a charging and discharging circuit according to another embodiment of the present invention;

[0037] Figure 5 is a circuit diagram of a charge and discharge circuit according to an embodiment of the present invention;

[0038] Figure 6 A control timing diagram of a power device in a charge and discharge circuit according to an embodiment of the present invention;

[0039] Figure 7 is a circuit diagram of a charging and discharging circuit according to another embodiment of the present invention;

[0040] Figure 8is a circuit diagram of a charging and discharging circuit according to yet another embodiment of the present invention;

[0041] Fig. 9 is a circuit diagram of a charging and discharging circuit according to yet another embodiment of the present invention;

[0042] Fig.10 is a circuit diagram of a charging and discharging circuit according to yet another embodiment of the present invention;

[0043] Fig.11 is a circuit diagram of a charging and discharging circuit according to yet another embodiment of the present invention;

[0044] Fig.12 is a block diagram of a charging and discharging device according to an embodiment of the present invention;

[0045] Fig.13 FIG. 4 is a block diagram of a vehicle according to an embodiment of the present invention.

[0046] Reference numerals:

[0047] Vehicles 1000;

[0048] A charging and discharging device 100, a first battery HV, and a second battery LV;

[0049] A charging and discharging circuit 10 and a controller 20;

[0050] A first DC conversion module 1, a second DC conversion module 2, and a power factor correction module 3;

[0051] A first primary circuit unit 11, a first transformer 12, a first secondary circuit unit 13, a second primary circuit unit 21, a second transformer 22, and a second secondary circuit unit 23;

[0052] The first midpoint A, the first midpoint B, the second midpoint C, the second midpoint D, the first inductor L1, the second capacitor C2, the third capacitor C3, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9, the tenth switch tube Q10, the eleventh switch tube Q11, the twelfth switch tube Q12, the thirteenth switch tube Q13, the fourteenth switch tube Q14, the fifteenth switch tube Q15, the sixteenth switch tube Q16, the seventeenth switch tube Q17, the eighteenth switch tube Q18, the AC port S1, the first DC port D1, and the second DC port D2. DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0054] In the prior art, such as Figure 1 As shown, it is a structural diagram of a two-in-one vehicle power supply in the prior art. Figure 2 This is a circuit diagram of a two-in-one vehicle power supply in the prior art. Figure 1 and Figure 2 As shown, the existing two-in-one vehicle power supply product topology is that the front-stage PFC circuit is connected to the rear-stage LLC, the rear-stage LLC output is connected to the power battery, and then the power battery is connected to a DCDC conversion circuit, and the output of the DCDC conversion circuit is connected to the battery, so that the vehicle power battery and the battery are powered by an external power supply. Among them, the front-stage PFC circuit realizes the conversion from AC voltage to DC voltage, the rear-stage LLC realizes the conversion from DC voltage to DC voltage, and the rear-stage LLC output is connected to the high-voltage battery, that is, the power battery. At the same time, the DCDC conversion circuit connected in parallel to the power battery end is used to realize the conversion from high voltage to low voltage, so as to realize the charging and discharging operations of the battery. As shown Figure 2 As shown, the DCDC conversion circuit connected to the power battery is directly connected to the power battery. When the vehicle-mounted power battery and the storage battery are powered by an external AC power supply during the charging process, it is necessary to control the front-stage PFC circuit, the rear-stage LLC and the DCDC conversion circuit to work at the same time, or when the vehicle-mounted power battery is powered by the storage battery during charging, it is necessary to control the DCDC conversion circuit to work. There are relatively few power devices reused in the entire circuit, so it is inevitable to use more power devices to meet different charging and discharging requirements. To this end, an embodiment of the present invention proposes a charging and discharging circuit, which can adjust the output voltage of the second DC conversion module by connecting the second primary circuit unit in the second DC conversion module to the first midpoint of the first primary circuit unit in the first DC conversion module or the second midpoint of the first secondary circuit unit. That is to say, in the process of charging and discharging the power battery and the storage battery, by reusing the first primary circuit unit or the first secondary circuit unit in the first DC conversion module, the different charging and discharging requirements of the whole vehicle battery equipment can be met. On this basis, the number of reused power devices can be increased, thereby achieving the purpose of reducing the number of power devices, which is conducive to reducing the volume and cost of integrated circuits as a whole.

[0055] Reference below Figure 3-Figure 11 A charge and discharge circuit according to an embodiment of the present invention is described.

[0056] In some embodiments of the present invention, it is possible to first combine Figure 3 and Figure 4 Understand the charging and discharging circuit of the embodiment of the present invention. Figure 3 is a block diagram of a charge and discharge circuit according to an embodiment of the present invention; Figure 4 FIG. 4 is a block diagram of a charge and discharge circuit according to another embodiment of the present invention.

[0057] Among them, Figure 3 or Figure 4 As shown, the charge and discharge circuit 10 includes a first DC conversion module 1 and a second DC conversion module 2. The first DC conversion module 1 includes a plurality of bridge arms and a first transformer 12, and each of the plurality of bridge arms is respectively connected to the coil of the first transformer 12, and is used to charge and discharge the first battery HV. The second DC conversion module 2 is connected to the midpoint of at least part of the plurality of bridge arms, and is used to charge and discharge the second battery LV.

[0058] Specifically, the first DC conversion module 1 includes a first primary circuit unit 11, a first transformer 12 and a first secondary circuit unit 13. The first primary circuit unit 11 includes a plurality of first bridge arms, each of which has a first midpoint. The first midpoint is connected to the primary coil of the first transformer 12. The first secondary circuit unit 13 includes a plurality of second bridge arms, each of which has a second midpoint. The second midpoint is connected to the secondary coil of the first transformer 12. The first secondary circuit unit 13 is connected to the first battery HV to charge and discharge the first battery HV. The first DC conversion module 1 can be a DCDC conversion circuit, and the first battery HV is a power battery in a vehicle. The second DC conversion module 2 is connected to the second battery LV for charging and discharging the second battery LV. The second DC conversion module 2 can be a DCDC conversion circuit, and the second battery LV is a storage battery in a vehicle. Normally, the power supply capacity of the power battery is higher than that of the storage battery. Figure 3 or Figure 4 The first midpoint or the second midpoint is not shown.

[0059] The second DC conversion module 2 includes a second primary circuit unit 21, which is connected to the first midpoint or the second midpoint and is used to adjust the output voltage of the second DC conversion module 2. Figure 3 As shown, the second primary circuit unit 21 is connected to the first midpoint of the first primary circuit unit 11 and is used to adjust the output voltage of the second DC conversion module 2 .

[0060] Furthermore, the second DC conversion module 2 further includes a second transformer 22 and a second secondary circuit unit 23. The primary coil of the second transformer 22 is connected to the second primary circuit unit 21; the second secondary circuit unit 23 is connected to the secondary coil of the second transformer 22 and the second battery LV.

[0061] Specifically, the following description is made by taking the charging of the first battery HV and the second battery LV by an external AC power source as an example.

[0062] like Figure 3As shown, when the first battery HV is charged by an external AC power source, the first primary circuit unit 11, the first transformer 12 and the first secondary circuit unit 13 in the first DC conversion module 1 can be controlled to realize charging of the first battery HV. When the second battery LV is charged by an external AC power source, while controlling the operation of the second DC conversion module 2, the first primary circuit unit 11 in the first DC conversion module 1 can also be reused to adjust the output voltage of the second DC conversion module 2, thereby realizing charging of the first battery HV.

[0063] Or, if Figure 4 As shown, a second primary circuit unit 21 may be provided to be connected to the second midpoint of the first secondary circuit unit 13 to adjust the output voltage of the second DC conversion module 2 .

[0064] When the first battery HV is charged by an external AC power source, the first primary circuit unit 11, the first transformer 12 and the first secondary circuit unit 13 in the first DC conversion module 1 can be controlled to realize charging of the first battery HV. When the second battery LV is charged by an external AC power source, while controlling the operation of the second DC conversion module 2, the first secondary circuit unit 13 in the first DC conversion module 1 can also be reused to adjust the output voltage of the second DC conversion module 2, thereby realizing charging of the first battery HV.

[0065] According to the charge and discharge circuit 10 proposed in the embodiment of the present invention, by connecting the second primary circuit unit 21 in the second DC conversion module 2 with the first midpoint of the first primary circuit unit 11 in the first DC conversion module 1 or the second midpoint of the first secondary circuit unit 13, that is, by reusing the first primary circuit unit 11 or the first secondary circuit unit 13 in the first DC conversion module 1, the output voltage of the second DC conversion module 2 can be adjusted, so that the charge and discharge circuit 10 can meet the charge and discharge requirements of the first battery HV and the second battery LV, and can also reduce the number of power devices in the circuit by increasing the number of power devices reused in the circuit, thereby being conducive to reducing the volume and cost of the integrated circuit as a whole.

[0066] In some embodiments of the present invention, the first primary circuit unit 11 includes two first bridge arms, the two first bridge arms have two first midpoints, namely, a first midpoint A and a first midpoint B; and the second secondary circuit unit 13 includes two second bridge arms, the two second bridge arms have two second midpoints, namely, a second midpoint C and a second midpoint D.

[0067] In some embodiments, the second primary circuit unit 21 includes two switch tubes, a first switch tube Q1 and a second switch tube Q2 , at least one of which is connected to the first midpoint or the second midpoint, and at least one of which is connected to the primary coil of the second transformer 22 .

[0068] The second DC conversion module 2 is connected to the first midpoint A and the first midpoint B of the first primary circuit unit 11 in the first DC conversion module 1 , or is connected to the second midpoint C and the second midpoint D of the first secondary circuit unit 13 in the first DC conversion module 1 .

[0069] Specifically, the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the second end of the primary coil of the second transformer 22 is connected to one of the two first midpoints, the drain of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the source of the second switch tube Q2 is connected to the other of the two first midpoints; or, the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the second end of the primary coil of the second transformer 22 is connected to one of the two second midpoints, the drain of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the source of the second switch tube Q2 is connected to the other of the two second midpoints.

[0070] Among them, Figure 5 and Figure 6 The circuit shown is described as an example. Figure 5 is a circuit diagram of a charge and discharge circuit according to an embodiment of the present invention, wherein: Figure 5 Only the second primary circuit unit 21 is connected to the first midpoint A and the first midpoint B of the first primary circuit unit 11, and the first switch tube Q1 and the second switch tube Q2 are arranged on one side of the primary coil of the second transformer 22. Specifically, the drain of the first switch tube Q1 is connected to one of the two first midpoints, the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the drain of the second switch tube Q2 is connected to the other of the two first midpoints, and the source of the second switch tube Q2 is connected to the second end of the primary coil of the second transformer 22.

[0071] And, the two switch tubes in the second primary circuit unit 21, namely the first switch tube Q1 and the second switch tube Q2, are turned on alternately. In a switching cycle, one of the switch tubes is controlled to be turned on naturally, and the output voltage can be controlled by controlling the duty cycle signal of the other switch tube. Furthermore, when the first switch tube Q1 or the second switch tube Q2 is controlled to be turned on, the control timing of the two is reversed.

[0072] Based on the above, it can be known that in the embodiment of the present invention, after the second primary circuit unit 21 in the second DC conversion module 2 is connected to the first midpoint A and the first midpoint B of the first primary circuit unit 11, the second primary circuit unit 21 can be set to include two switch tubes, the first switch tube Q1 and the second switch tube Q2. By reusing the bridge arm in the first primary circuit unit 11, the output voltage of the second DC conversion module 2 can be controlled. Figure 2 In the circuit of the prior art shown, the second DC conversion module 2 of the embodiment of the present invention uses only two switching tubes, which greatly reduces the number of power devices, improves the integration of power topology, increases the number of reused power devices, reduces the volume and reduces the cost.

[0073] In some embodiments of the present invention, Figure 5 As shown, the first primary circuit unit 11 includes a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5 and a sixth switch tube Q6.

[0074] The third switch tube Q3 is connected to the fourth switch tube Q4, a first midpoint A is defined between the third switch tube Q3 and the fourth switch tube Q4, and the first midpoint A is connected to one end of the primary coil of the first transformer 12. The fifth switch tube Q5 is connected to the third switch tube Q3, the fifth switch tube Q5 is connected to the sixth switch tube Q6, the sixth switch tube Q6 is connected to the fourth switch tube Q4, a first midpoint B is defined between the fifth switch tube Q5 and the sixth switch tube Q6, and the first midpoint B is connected to the other end of the primary coil of the first transformer 12.

[0075] Furthermore, the first secondary circuit unit 13 includes a seventh switch tube Q7 , an eighth switch tube Q8 , a ninth switch tube Q9 and a tenth switch tube Q10 .

[0076] Among them, the seventh switch tube Q7 is connected to the eighth switch tube Q8, the seventh switch tube Q7 is connected to the first end of the first battery HV, a second midpoint C is provided between the seventh switch tube Q7 and the eighth switch tube Q8, and the second midpoint C is connected to one end of the secondary coil of the first transformer 12. The ninth switch tube Q9 is connected to the seventh switch tube Q7 and one end of the first battery HV, the ninth switch tube Q9 is connected to the tenth switch tube Q10, the tenth switch tube Q10 is connected to the eighth switch tube Q8 and the second end of the first battery HV, the first capacitor C1 is connected to both ends of the first battery HV, a second midpoint D is provided between the ninth switch tube Q9 and the tenth switch tube Q10, and the second midpoint D is connected to the other end of the secondary coil of the first transformer 12.

[0077] In some embodiments, the secondary coil of the second transformer 22 includes a plurality of coils, and a first end of each coil is connected to a first end of the second battery LV through an inductor. Figure 5Taking the circuit shown in the figure as an example, the secondary coil of the second transformer 22 includes a first secondary coil and a second secondary coil, the first end of the first secondary coil and the first end of the second secondary coil are connected together as a common end, and the common end is connected to the first end of the second battery LV through an inductor, wherein the inductor is the first inductor L1 in the figure. The first end of the second secondary circuit unit 23 is connected to the second end of the first secondary coil and the second end of the second secondary coil, the second end of the second secondary circuit unit 23 is connected to the second end of the second battery LV, and the two ends of the second battery LV are connected to a second capacitor C2.

[0078] In some embodiments, the second secondary circuit unit 23 includes a plurality of switch tubes, and the second end of each coil is connected to the second end of the second battery LV through a corresponding one of the plurality of switch tubes. Figure 5 Taking the circuit shown in FIG. 1 as an example, the second secondary circuit unit 23 includes an eleventh switch tube Q11 and a twelfth switch tube Q12, the second end of the first secondary coil is connected to the second end of the second battery LV through the eleventh switch tube Q11, and the second end of the second secondary coil is connected to the second end of the second battery LV through the twelfth switch tube Q12. The drain of the eleventh switch tube Q11 is connected to the second end of the first secondary coil, the source of the eleventh switch tube Q11 is connected to the source of the twelfth switch tube Q12 and the second end of the second battery LV, and the drain of the twelfth switch tube Q12 is connected to the second end of the second secondary coil.

[0079] In some embodiments, within the control cycle, the third switch tube Q3 and the sixth switch tube Q6 are synchronously turned on and off, and the fourth switch tube Q4 and the fifth switch tube Q5 are synchronously turned on and off, and after reserving a preset percentage of dead zone, the timing of the switch tube in the first primary circuit unit 11 and the switch tube in the first secondary circuit unit 13 presents a complementary state. Among them, the reserved preset percentage of the dead zone between the third switch tube Q3, the sixth switch tube Q6 and the fourth switch tube Q4, the fifth switch tube Q5 can be set as needed, for example, the reserved preset percentage can be set to 2%, 5%, 8%, 10%, etc., which is not specifically limited here. The embodiment of the present invention is described by taking the reserved preset percentage of 5% as an example.

[0080] In some embodiments, the duty cycles of the third switch tube Q3 and the sixth switch tube Q6 are both the first duty cycle, the duty cycle of the first switch tube Q1 is the second duty cycle, and the first duty cycle is greater than the second duty cycle.

[0081] Specifically, it can be combined Figure 6 Understand the first duty cycle and the second duty cycle of the embodiment of the present invention. Figure 6 FIG. 1 is a control timing diagram of a power device in a charge and discharge circuit according to an embodiment of the present invention. Figure 6Ts*D1 represents the first duty cycle, and Ts*D2 represents the second duty cycle.

[0082] Specifically, in some embodiments, when the third switch tube Q3 and the sixth switch tube Q6 are both turned on, the second switch tube Q2 is turned on and the first switch tube Q1 is turned off, the eleventh switch tube Q11 is turned on and the twelfth switch tube Q12 is turned off. Figure 6 As shown, since the first duty cycle is set to be greater than the second duty cycle, when the third switch tube Q3, the sixth switch tube Q6 and the second switch tube Q2 are all turned on, the turn-on time of the second switch tube Q2 is shorter than the turn-on time of the third switch tube Q3 and the sixth switch tube Q6, and, in the control cycle, each time after the third switch tube Q3 and the sixth switch tube Q6 are turned on, the second switch tube Q2 is turned on, and before the third switch tube Q3 and the sixth switch tube Q6 are turned off, the second switch tube Q2 has been turned off. Under this working condition, the primary coil of the second transformer 22 is negative and the secondary coil is positive, and the working condition of the second secondary circuit unit 23 in the second DC conversion module 2 is that the eleventh switch tube Q11 is turned on and the twelfth switch tube Q12 is turned off, and the current flows from the first inductor L1 to the second capacitor C2, and then to the eleventh switch tube Q11, so that the third switch tube Q3 and the sixth switch tube Q6 in the first primary circuit unit 11 can be reused to realize the operation of charging and discharging the second battery LV.

[0083] Below, for the case where the first secondary circuit unit 21 in the second DC conversion module 2 is connected to the first midpoint A and the second midpoint B of the first primary circuit unit 11, the duty cycles of the first switch tube Q1 and the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 and their on and off conditions can be understood based on the on and off conditions of the third switch tube Q3, the sixth switch tube Q6 and the second switch tube Q2, and will not be repeated below.

[0084] Alternatively, when the fourth switch tube Q4 and the fifth switch tube Q5 are both turned on, the first switch tube Q1 is turned on and the second switch tube Q2 is turned off, the twelfth switch tube Q12 is turned on and the eleventh switch tube Q11 is turned off. Under this working condition, the primary coil of the second transformer 22 is positive and the secondary coil is negative, the working condition of the second secondary circuit unit 23 in the second DC conversion module 2 is that the twelfth switch tube Q12 is turned on and the eleventh switch tube Q11 is turned off, and the current flows from the first inductor L1 to the second capacitor C2, and then to the twelfth switch tube Q12, so that the fourth switch tube Q4 and the fifth switch tube Q5 in the first primary circuit unit 11 can be reused to realize the operation of charging and discharging the second battery LV.

[0085] Furthermore, for each switch tube in the first primary circuit unit 11 in the above-mentioned first DC conversion module 1, and each switch tube in the second DC conversion module 2, the embodiment of the present invention can also adjust the output voltage of the second DC conversion module 2 by adjusting the size of the first duty cycle and the second duty cycle.

[0086] In other embodiments of the present invention, Figure 7 , which is a circuit diagram of a charge and discharge circuit according to another embodiment of the present invention, wherein the source of the first switch tube Q1 is connected to one of the first midpoint A and the first midpoint B, the drain of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the source of the second switch tube Q2 is connected to the other of the first midpoint A and the first midpoint B, and the drain of the second switch tube Q2 is connected to the second end of the primary coil of the second transformer 22.

[0087] In this case, when the second primary circuit unit 21 is connected to the first midpoint A and the second midpoint B of the first primary circuit unit 11, the first switch tube Q1 and the second switch tube Q2 can also be respectively arranged on both sides of the primary coil of the second transformer 22, and other conditions are the same as above. Figure 5 The situation shown in the figure is the same as that in which the first switch tube Q1 and the second switch tube Q2 are arranged on one side of the primary coil of the second transformer 22. By setting the control timing of the first switch tube Q1 and the second switch tube Q2 to be reversed, the third switch tube Q3 and the sixth switch tube Q6 in the first primary circuit unit 11 can be reused to achieve the purpose of charging and discharging the second battery LV.

[0088] In other embodiments of the present invention, Figure 8 , which is a circuit diagram of a charging and discharging circuit according to another embodiment of the present invention, wherein the drain of the first switch tube Q1 is connected to one of the first midpoint A and the first midpoint B, the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the drain of the second switch tube Q2 is connected to the other of the first midpoint A and the first midpoint B, and the source of the second switch tube Q2 is connected to the second end of the primary coil of the second transformer 22.

[0089] In this case, when the second primary circuit unit 21 is connected to the first midpoint A and the second midpoint B of the first primary circuit unit 11, the first switch tube Q1 and the second switch tube Q2 can also be respectively arranged on both sides of the primary coil of the second transformer 22, and relative to Figure 7 The first switch tube Q1 and the second switch tube Q2 are placed in reverse positions, and the other conditions are the same as above. Figure 5The situation shown in the figure is the same as that in which the first switch tube Q1 and the second switch tube Q2 are arranged on one side of the primary coil of the second transformer 22. By setting the control timing of the first switch tube Q1 and the second switch tube Q2 to be reversed, the third switch tube Q3 and the sixth switch tube Q6 in the first primary circuit unit 11 can be reused to achieve the purpose of charging and discharging the second battery LV.

[0090] Above, for Figure 7 and Figure 8 In the case shown in FIG. 1 , the duty ratios of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 and their on and off conditions can all be determined based on the above contents and Figure 6 Please understand and I will not elaborate on it here.

[0091] Alternatively, in some embodiments of the present invention, Fig. 9 , which is a circuit diagram of a charge and discharge circuit according to another embodiment of the present invention, wherein the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the second end of the primary coil of the second transformer 22 is connected to the other of the second midpoint C and the second midpoint D, the drain of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the source of the second switch tube Q2 is connected to one of the second midpoint C and the second midpoint D.

[0092] In this case, the second primary circuit unit 21 is connected to the second midpoint C and the second midpoint D of the first secondary circuit unit 13 , and the first switch tube Q1 and the second switch tube Q2 are both arranged on one side of the primary coil of the second transformer 22 .

[0093] In some embodiments, during the control cycle, the third switch tube Q3, the sixth switch tube Q6, the seventh switch tube Q7 and the tenth switch tube Q10 are synchronously turned on and off, the fourth switch tube Q4, the fifth switch tube Q5, the eighth switch tube Q8 and the ninth switch tube Q9 are synchronously turned on and off, and after reserving a preset percentage of dead zone, the timing of the switch tube in the first primary circuit unit 11 and the switch tube in the first secondary circuit unit 13 presents a complementary state. Among them, the reserved preset percentage of the dead zone between the third switch tube Q3, the sixth switch tube Q6, the seventh switch tube Q7, the tenth switch tube Q10 and the fourth switch tube Q4, the fifth switch tube Q5, the eighth switch tube Q8, and the ninth switch tube Q9 can be set as needed, for example, the reserved preset percentage can be set to 2%, 5%, 8%, 10%, etc., which is not specifically limited here. The embodiment of the present invention is described by taking the reserved preset percentage of 5% as an example.

[0094] In some embodiments, the duty cycles of the seventh switch tube Q7 and the tenth switch tube Q10 are both the third duty cycle, the duty cycle of the first switch tube Q1 is the second duty cycle, and the third duty cycle is greater than the second duty cycle. Figure 6 Ts*D3 in represents a third duty cycle, wherein the third duty cycle Ts*D3 is equal to the first duty cycle Ts*D1.

[0095] In some embodiments, when the seventh switch tube Q7 and the tenth switch tube Q10 are both turned on, the second switch tube Q2 is turned on and the first switch tube Q1 is turned off, the eleventh switch tube Q11 is turned on and the twelfth switch tube Q12 is turned off.

[0096] like Figure 6 As shown, since the third duty cycle is set to be greater than the second duty cycle, when the seventh switch tube Q7, the tenth switch tube Q10 and the second switch tube Q2 are all turned on, the turn-on time of the second switch tube Q2 is shorter than the turn-on time of the seventh switch tube Q7 and the tenth switch tube Q10, and, in the control cycle, each time after the seventh switch tube Q7 and the tenth switch tube Q10 are turned on, the second switch tube Q2 is turned on, and before the seventh switch tube Q7 and the tenth switch tube Q10 are turned off, the second switch tube Q2 has been turned off. Under this operating condition, under this operating condition, the voltage between the second midpoint C and the second midpoint D is the voltage of the first battery HV. The primary coil of the second transformer 22 is negative, and the secondary coil is positive. The operating condition of the second secondary circuit unit 23 in the second DC conversion module 2 is that the eleventh switch tube Q11 is turned on and the twelfth switch tube Q12 is turned off. The current flows from the first inductor L1 to the second capacitor C2, and then to the eleventh switch tube Q11, so that the seventh switch tube Q7 and the tenth switch tube Q10 in the first secondary circuit unit 13 can be reused to realize the operation of charging and discharging the second battery LV.

[0097] Below, for the case where the first secondary circuit unit 21 in the second DC conversion module 2 is connected to the second midpoint C and the second midpoint D of the first secondary circuit unit 13, the duty cycles of the first switch tube Q1 and the second switch tube Q2, the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9 and the tenth switch tube Q10 and their on and off conditions can be understood based on the on and off conditions of the above-mentioned seventh switch tube Q7, the tenth switch tube Q10 and the second switch tube Q2, and will not be repeated below.

[0098] Alternatively, when the eighth switch tube Q8 and the ninth switch tube Q9 are both turned on, the first switch tube Q1 is turned on and the second switch tube Q2 is turned off, the twelfth switch tube Q12 is turned on and the eleventh switch tube Q11 is turned off. Under this operating condition, the voltage between the second midpoint C and the second midpoint D is the reverse voltage of the first battery HV. The primary coil of the second transformer 22 is positive and the secondary coil is negative. The operating condition of the second secondary circuit unit 23 in the second DC conversion module 2 is that the twelfth switch tube Q12 is turned on and the eleventh switch tube Q11 is turned off. The current flows from the first inductor L1 to the second capacitor C2, and then to the twelfth switch tube Q12, so that the seventh switch tube Q7 and the tenth switch tube Q10 in the first secondary circuit unit 13 can be reused to realize the operation of charging and discharging the second battery LV.

[0099] In some embodiments, the duty cycle of the first switch tube Q1 and the second switch tube Q2 is controlled to adjust the output voltage of the second DC conversion module 2. Specifically, for each switch tube in the first DC conversion module 1 and each switch tube in the second DC conversion module 2, the embodiment of the present invention can also adjust the output voltage of the second DC conversion module 2 by adjusting the third duty cycle and the second duty cycle.

[0100] In other embodiments of the present invention, Fig.10 As shown, it is a circuit diagram of a charging and discharging circuit according to another embodiment of the present invention, wherein the source of the first switch tube Q1 is connected to one of the third midpoint C, the second midpoint C and the fourth midpoint D, the drain of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the source of the second switch tube Q2 is connected to the other of the third midpoint C, the second midpoint C and the fourth midpoint D, the drain of the second switch tube Q2 is connected to the second end of the primary coil of the second transformer 22.

[0101] In this case, when the second primary circuit unit 21 is connected to the second midpoint of the first secondary circuit unit 13, the first switch tube Q1 and the second switch tube Q2 can also be respectively arranged on both sides of the primary coil of the second transformer 22, and other conditions are the same as above. Fig. 9 The situation shown in the figure is the same as that in which the first switch tube Q1 and the second switch tube Q2 are arranged on one side of the primary coil of the second transformer 22. By setting the control timing of the first switch tube Q1 and the second switch tube Q2 to be reversed, the seventh switch tube Q7 and the tenth switch tube Q10 in the first secondary circuit unit 13 can be reused to achieve the purpose of charging and discharging the second battery LV.

[0102] In other embodiments of the present invention, Fig.11, which is a circuit diagram of a charge and discharge circuit according to another embodiment of the present invention, wherein the drain of the first switch tube Q1 is connected to one of the second midpoint C and the second midpoint D, the source of the first switch tube Q1 is connected to the first end of the primary coil of the second transformer 22, the drain of the second switch tube Q2 is connected to the other of the second midpoint C and the second midpoint D, and the source of the second switch tube Q2 is connected to the second end of the primary coil of the second transformer 22.

[0103] In this case, when the second primary circuit unit 21 is connected to the second midpoint C and the second midpoint D of the first secondary circuit unit 13, the first switch tube Q1 and the second switch tube Q2 can also be respectively arranged on both sides of the primary coil of the second transformer 22, and relative to Fig.10 The first switch tube Q1 and the second switch tube Q2 are placed in reverse positions, and the other conditions are the same as above. Fig. 9 The situation shown in the figure is the same as that in which the first switch tube Q1 and the second switch tube Q2 are arranged on one side of the primary coil of the second transformer 22. By setting the control timing of the first switch tube Q1 and the second switch tube Q2 to be reversed, the seventh switch tube Q7 and the tenth switch tube Q10 in the first secondary circuit unit 13 can be reused to achieve the purpose of charging and discharging the second battery LV.

[0104] In some embodiments of the present invention, Figure 3 or Figure 4 As shown, the charge and discharge circuit 10 also includes a power factor correction module 3, the input end of the power factor correction module 3 is suitable for inputting an AC signal, and the output end of the power factor correction module 3 is connected to the input end of the first DC conversion module 1 for converting the AC signal into a DC signal.

[0105] Specifically, in some embodiments, Figure 5 , Figure 7-Figure 11 As shown, the power factor correction module 3 includes a thirteenth switch tube Q13, a fourteenth switch tube Q14, a fifteenth switch tube Q15, a sixteenth switch tube Q16, a seventeenth switch tube Q17 and an eighteenth switch tube Q18.

[0106] Among them, the source of the thirteenth switch tube Q13 is connected to the drain of the fourteenth switch tube Q14, the drain of the thirteenth switch tube Q13 and the source of the fourteenth switch tube Q14 are respectively connected to the input end of the first primary circuit unit 11, and there is a fifth midpoint between the thirteenth switch tube Q13 and the fourteenth switch tube Q14, and the fifth midpoint is suitable for inputting an AC signal; the source of the fifteenth switch tube Q15 is connected to the drain of the sixteenth switch tube Q16, and the drain of the fifteenth switch tube Q15 and the source of the sixteenth switch tube Q16 are respectively connected to The input end of the first primary circuit unit 11 is connected, and there is a sixth midpoint between the fifteenth switch tube Q15 and the sixteenth switch tube Q16, and the sixth midpoint is suitable for inputting an AC signal; the source of the seventeenth switch tube Q17 is connected to the drain of the eighteenth switch tube Q18, and the drain of the seventeenth switch tube Q17 and the source of the eighteenth switch tube Q18 are respectively connected to the input end of the first primary circuit unit 11, and there is a seventh midpoint between the seventeenth switch tube Q17 and the eighteenth switch tube Q18, and the seventh midpoint is suitable for inputting an AC signal. Among them, the fifth midpoint, the sixth midpoint and the seventh midpoint are not shown in the figure.

[0107] In addition, the power factor correction module 3 also includes a third capacitor C3, one end of the third capacitor C3 is connected to the drain of the thirteenth switch tube Q13, the drain of the fifteenth switch tube Q15, and the drain of the seventeenth switch tube Q17, and the other end of the third capacitor C3 is connected to the source of the fourteenth switch tube Q14, the source of the sixteenth switch tube Q16, and the source of the eighteenth switch tube Q18.

[0108] As described above, the charge and discharge circuit 10 proposed according to the embodiment of the present invention can adjust the output voltage of the second DC conversion module 2 by connecting the second primary circuit unit 21 in the second DC conversion module 2 with the first midpoint A and the second midpoint B of the first primary circuit unit 11 in the first DC conversion module 1 or the second midpoint C and the second midpoint D of the first secondary circuit unit 13, that is, by reusing the first primary circuit unit 11 or the first secondary circuit unit 13 in the first DC conversion module 1. Compared with the prior art, the charge and discharge circuit 10 can not only meet the charge and discharge requirements of the first battery HV and the second battery LV, but also reduce the number of power devices in the second primary circuit unit 21 in the second DC conversion module 2 in the circuit by increasing the number of power devices reused in the circuit, which is conducive to reducing the volume and cost of the integrated circuit as a whole.

[0109] In some embodiments of the present invention, a charging and discharging device is also provided, and the charging and discharging device at least includes an on-board power supply. Fig.12As shown, it is a block diagram of a charging and discharging device according to an embodiment of the present invention, wherein the charging and discharging device 100 includes a charging and discharging circuit 10 of any of the above embodiments, an AC port S1, a first DC port D1, and a second DC port D2, wherein the AC port S1 is connected to the input end of the power factor correction module 3 of the charging and discharging circuit 10, the first DC port D1 is connected to the output end of the first DC conversion module 1 of the charging and discharging circuit 10, and the second DC port D2 is connected to the output end of the second DC conversion module 2 of the charging and discharging circuit 10. Specifically, the AC port S1 is used for an external AC power source or an AC power-consuming device, and the first DC port D1 is used to connect to a first battery HV in a vehicle so that the charging and discharging circuit 10 can charge and discharge the first battery HV. The second DC port D2 is connected to a second battery LV in the vehicle so that the charging and discharging circuit 10 can charge and discharge the second battery LV. Among them, the specific composition and working state of the charging and discharging circuit 10 can be understood in conjunction with the above embodiments, and will not be repeated here.

[0110] And, in some embodiments, the charging and discharging device 100 further includes a controller 20, which is connected to the charging and discharging circuit 10 and is used to control the switch tube in the charging and discharging circuit 10 according to a preset timing. Among them, the controller 20 can be integrated into the charging and discharging device, or it can be not integrated, or the controller 20 can use other controllers in the vehicle, such as a vehicle controller or a domain controller, to realize the control function.

[0111] The charging and discharging device 100 proposed in an embodiment of the present invention, by adopting the charging and discharging circuit 10 of any one of the above embodiments and reusing the power devices in the charging and discharging circuit 10, can not only meet the charging and discharging requirements of different vehicle batteries, but also reduce the number of power devices in the charging and discharging circuit 10 by increasing the number of reused power devices in the circuit, thereby facilitating reducing the overall size and cost of the charging and discharging device 100.

[0112] In some embodiments of the present invention, a vehicle is also provided, such as Fig.13 , which is a block diagram of a vehicle according to an embodiment of the present invention, wherein the vehicle 1000 includes a first battery HV, a second battery LV and a charging and discharging device 100 according to the second embodiment of the above.

[0113] The power supply capacity of the second battery LV is lower than that of the first battery HV. For example, the first battery HV may be a power battery, and the second battery LV may be a storage battery. The first DC port D1 of the charging and discharging device 100 is connected to the first battery HV, and the second DC port D2 of the charging and discharging device 100 is connected to the second battery LV.

[0114] The vehicle 1000 proposed according to the embodiment of the present invention, by adopting the charging and discharging device 100 of any of the above embodiments and reusing the power devices in the charging and discharging circuit 10, can not only meet the charging and discharging requirements of the first battery HV and the second battery LV, but also help to reduce the volume of the integrated circuits in the whole vehicle and reduce the cost of the whole vehicle.

[0115] Other structures and operations of the vehicle 100 , the charging and discharging device 100 and the charging and discharging circuit 10 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail herein.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0117] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A charging and discharging circuit, characterized in that: include: A first DC conversion module, the first DC conversion module comprising a plurality of bridge arms and a first transformer, each of the plurality of bridge arms being respectively connected to a coil of the first transformer, and being used for charging and discharging the first battery; A second DC conversion module, wherein the second DC conversion module is connected to the midpoints of at least some of the bridge arms of the plurality of bridge arms and is used for charging and discharging the second battery.

2. The charge and discharge circuit according to claim 1, characterized in that: The first DC conversion module comprises: A first primary circuit unit, the first primary circuit unit comprising a plurality of first bridge arms, each of the plurality of first bridge arms having a first midpoint, and the first midpoint being connected to a primary coil of the first transformer; A first secondary circuit unit is connected to the first battery, and includes a plurality of second bridge arms, each of the plurality of second bridge arms has a second midpoint, and the second midpoint is connected to the secondary coil of the first transformer.

3. The charge and discharge circuit according to claim 2, characterized in that: The second DC conversion module comprises: a second primary circuit unit, the second primary circuit unit being connected to the first midpoint or the second midpoint and being used to adjust the output voltage of the second DC conversion module; a second transformer, wherein a primary coil of the second transformer is connected to the second primary circuit unit; A second secondary circuit unit is connected to the secondary coil of the second transformer and the second battery.

4. The charge and discharge circuit according to claim 3, characterized in that: The second primary circuit unit comprises: A first switch tube and a second switch tube, at least one of the first switch tube and the second switch tube is connected to the first midpoint or the second midpoint, and at least one of the first switch tube and the second switch tube is connected to the primary coil of the second transformer.

5. The charge and discharge circuit according to claim 4, characterized in that: The first primary circuit unit includes two first bridge arms, and the two first bridge arms have two first midpoints; The first secondary circuit unit includes two second bridge arms, and the two second bridge arms have two second midpoints.

6. The charge and discharge circuit according to claim 5, characterized in that: The source of the first switch tube is connected to the first end of the primary coil of the second transformer, the second end of the primary coil of the second transformer is connected to one of the two first midpoints, the drain of the first switch tube is connected to the drain of the second switch tube, and the source of the second switch tube is connected to the other of the two first midpoints; Alternatively, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the second end of the primary coil of the second transformer is connected to one of the two second midpoints, the drain of the first switching tube is connected to the drain of the second switching tube, and the source of the second switching tube is connected to the other of the two second midpoints.

7. The charge and discharge circuit according to claim 5, characterized in that: The source of the first switch tube is connected to one of the two first midpoints, the drain of the first switch tube is connected to the first end of the primary coil of the second transformer, the source of the second switch tube is connected to the other of the two first midpoints, and the drain of the second switch tube is connected to the second end of the primary coil of the second transformer; Alternatively, the source of the first switching tube is connected to one of the two second midpoints, the drain of the first switching tube is connected to the first end of the primary coil of the second transformer, the source of the second switching tube is connected to the other of the two second midpoints, and the drain of the second switching tube is connected to the second end of the primary coil of the second transformer.

8. The charge and discharge circuit according to claim 5, characterized in that: The drain of the first switch tube is connected to one of the two first midpoints, the source of the first switch tube is connected to the first end of the primary coil of the second transformer, the drain of the second switch tube is connected to the other of the two first midpoints, and the source of the second switch tube is connected to the second end of the primary coil of the second transformer; Alternatively, the drain of the first switching tube is connected to one of the two second midpoints, the source of the first switching tube is connected to the first end of the primary coil of the second transformer, the drain of the second switching tube is connected to the other of the two second midpoints, and the source of the second switching tube is connected to the second end of the primary coil of the second transformer.

9. The charge and discharge circuit according to any one of claims 4 to 8, characterized in that: The first primary circuit unit comprises: A third switch tube and a fourth switch tube, wherein the third switch tube is connected to the fourth switch tube; a fifth switch tube and a sixth switch tube, wherein the fifth switch tube is connected to the third switch tube and the sixth switch tube, and the sixth switch tube is connected to the fourth switch tube; The first midpoint is respectively provided between the third switch tube and the fourth switch tube and between the fifth switch tube and the sixth switch tube, and the two first midpoints are connected to two ends of the primary coil of the first transformer.

10. The charge and discharge circuit according to claim 9, characterized in that: The first secondary circuit unit comprises: a seventh switch tube and an eighth switch tube, wherein the seventh switch tube is connected to the eighth switch tube, and the seventh switch tube is connected to the first end of the first battery; a ninth switch tube and a tenth switch tube, wherein the ninth switch tube is connected to the seventh switch tube, the tenth switch tube, and a first end of the first battery, the tenth switch tube is connected to the eighth switch tube and a second end of the first battery, and both ends of the first battery are connected to a first capacitor; The second midpoint is respectively provided between the seventh switch tube and the eighth switch tube and between the ninth switch tube and the tenth switch tube, and the two second midpoints are connected to two ends of the secondary coil of the first transformer.

11. The charge and discharge circuit according to claim 10, characterized in that: The secondary coil of the second transformer includes a plurality of coils, and a first end of each coil is connected to a first end of the second battery through an inductor; The second secondary circuit unit includes a plurality of switch tubes, and the second end of each coil is connected to the second end of the second battery through a corresponding one of the plurality of switch tubes.

12. The charge and discharge circuit according to claim 11, characterized in that: The secondary coil of the second transformer includes a first secondary coil and a second secondary coil, the first ends of the first secondary coil and the second secondary coil are connected together to serve as a coil common end, and the coil common end is connected to the first end of the second battery through the inductor; The second secondary circuit unit includes an eleventh switching tube and a twelfth switching tube, the second end of the first secondary coil is connected to the second end of the second battery through the eleventh switching tube, and the second end of the second secondary coil is connected to the second end of the second battery through the twelfth switching tube.

13. The charge and discharge circuit according to claim 12, characterized in that: During the control cycle, The third switch tube, the sixth switch tube, the seventh switch tube and the tenth switch tube are turned on and turned off synchronously, and the fourth switch tube, the fifth switch tube, the eighth switch tube and the ninth switch tube are turned on and turned off synchronously, and after reserving a preset percentage of dead zone, the timing of the switch tube in the first primary circuit unit and the timing of the switch tube in the first secondary circuit unit are complementary.

14. The charge and discharge circuit according to claim 13, characterized in that: The first switch tube and the second switch tube are turned on alternately.

15. The charge and discharge circuit according to claim 14, characterized in that: When the third switch tube and the sixth switch tube are both turned on, the second switch tube is turned on and the first switch tube is turned off, the eleventh switch tube is turned on and the twelfth switch tube is turned off; Alternatively, when the fourth switch tube and the fifth switch tube are both turned on, the first switch tube is turned on and the second switch tube is turned off, the twelfth switch tube is turned on and the eleventh switch tube is turned off.

16. The charge and discharge circuit according to claim 15, characterized in that: The duty cycles of the third switch tube and the sixth switch tube are both the first duty cycle, the duty cycle of the second switch tube is the second duty cycle, and the first duty cycle is greater than the second duty cycle; The output voltage of the second DC conversion module is adjusted by adjusting the first duty cycle and the second duty cycle.

17. The charge and discharge circuit according to claim 15, characterized in that: The duty cycles of the seventh switch tube and the tenth switch tube are both the third duty cycle, the duty cycle of the second switch tube is the second duty cycle, and the third duty cycle is greater than the second duty cycle; The output voltage of the second DC conversion module is adjusted by adjusting the third duty cycle and the second duty cycle.

18. The charge and discharge circuit according to any one of claims 1 to 8, characterized in that: The charging and discharging circuit further comprises: A power factor correction module, wherein the input end of the power factor correction module is suitable for inputting an AC signal, and the output end of the power factor correction module is connected to the input end of the first DC conversion module for converting the AC signal into a DC signal.

19. A charging and discharging device, characterized in that: include: The charging and discharging circuit according to any one of claims 1 to 18; An AC port, a first DC port and a second DC port, wherein the AC port is connected to the input end of the power factor correction module of the charging and discharging circuit, the first DC port is connected to the output end of the first DC conversion module of the charging and discharging circuit, and the second DC port is connected to the output end of the second DC conversion module of the charging and discharging circuit.

20. The charge-discharge device according to claim 19, characterized in that: The charging and discharging device further comprises: A controller is connected to the charge and discharge circuit and is used to control the switch tube in the charge and discharge circuit according to a preset timing.

21. A vehicle, characterized in that: The vehicle comprises: A first battery and a second battery, wherein a power supply capacity of the second battery is lower than a power supply capacity of the first battery; The charging and discharging device according to claim 19 or 20, wherein the first DC port of the charging and discharging device is connected to the first battery, and the second DC port of the charging and discharging device is connected to the second battery.

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