Vehicle-mounted charger, charging control method, electronic equipment, storage medium and vehicle

Abstract

The invention discloses a vehicle-mounted charger, a charging control method, electronic equipment, a storage medium and a vehicle. The vehicle-mounted charger comprises a power factor correction module and a direct current conversion module, the input end of the power factor correction module is suitable for being connected with a power supply and is used for performing boost-buck processing on an input alternating current signal and outputting a first direct current signal; the input end of the direct-current conversion module is connected with the output end of the power factor correction module, the output end of the direct-current conversion module is suitable for being connected with a battery and used for converting the first direct-current electric signal into a direct-current electric signal of the battery, and the ratio of the direct-current electric signal of the battery to the first direct-current electric signal is a preset fixed gain value. The charger can enlarge the adjustable voltage range of the power factor correction module, the direct current conversion module presets a fixed gain value, it can be guaranteed that wide-range voltage regulation of the direct current conversion module is not needed, full-voltage high-efficiency work can be achieved, and the size of the vehicle-mounted charger can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to an on-board charger, a charging control method, an electronic device, a computer-readable storage medium and a vehicle. Background Art

[0002] In the related technology, the on-board charging power factor correction module can only boost the voltage, and the adjustable range is small. Therefore, the subsequent DC conversion module is required to have a large voltage regulation range, resulting in low efficiency. In addition, the gain range needs to be taken into account in the high-frequency and small-volume design. The magnetic devices are large in size, resulting in a large volume of the entire machine. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a vehicle-mounted charger, which can increase the adjustable voltage range of the power factor correction module, and the DC conversion module presets a fixed gain value, which can ensure that the DC conversion module does not need to adjust the voltage over a wide range, can achieve full voltage high-efficiency operation, and can reduce the size of the vehicle-mounted charger.

[0004] The second objective of the present invention is to provide a charging control method.

[0005] The third objective of the present invention is to provide an electronic device.

[0006] A fourth objective of the present invention is to provide a computer storage medium.

[0007] A fifth object of the present invention is to provide a vehicle.

[0008] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a vehicle-mounted charger, including: a power factor correction module, the input end of the power factor correction module is suitable for connecting to a power supply, for performing step-up and step-down processing on the input AC power signal and outputting a first DC power signal; a DC conversion module, the input end of the DC conversion module is connected to the output end of the power factor correction module, the output end of the DC conversion module is suitable for connecting to a battery, for converting the first DC power signal into a DC power signal of the battery, and the ratio of the DC power signal of the battery to the first DC power signal is a preset fixed gain value.

[0009] According to the on-board charger of the embodiment of the present invention, the power factor correction module can perform step-up and step-down processing on the input AC power signal, thereby increasing the adjustable voltage range. Therefore, the subsequent DC conversion module does not have to adopt a large voltage adjustment range, and the volume of the subsequent tributary conversion module can be reduced, that is, the volume of the on-board charger is reduced; and the DC conversion module adopts a preset fixed gain value, which makes it possible for the DC conversion module to operate at a high-efficiency operating point. The on-board charger can achieve full-voltage high-efficiency operation, reduce losses, and achieve high frequency.

[0010] In some embodiments, the preset fixed gain value corresponds to the DC conversion module operating at an ideal efficiency operating point, where the ideal efficiency operating point is an operating point where the operating efficiency of the DC conversion module is higher than an efficiency threshold.

[0011] In some embodiments, the power factor correction module includes: multiple bridge arm circuits, each of which has a midpoint; a bidirectional switch unit, which is connected to the midpoints of the multiple bridge arm circuits, and the bidirectional switch unit is also suitable for connecting to the power supply to control the connection status between the multiple bridge arm circuits and the power supply, and / or control the connection status between the midpoints of the multiple bridge arm circuits to achieve step-up and step-down processing of the input AC signal.

[0012] In some embodiments, the bidirectional switch unit includes: an inductor, a first end of which is connected to a midpoint of one of the multiple bridge arm circuits; a first bidirectional switch, a first end of which is suitable for being connected to a first end of the power supply, and a second end of the first bidirectional switch is connected to a second end of the inductor, for controlling the connection state between the multiple bridge arm circuits and the power supply.

[0013] In some embodiments, the bidirectional switch unit also includes: a second bidirectional switch, the first end of the second bidirectional switch is suitable for connecting to the second end of the power supply, the second end of the second bidirectional switch is connected to the midpoint of one bridge arm circuit among the multiple bridge arm circuits through the inductor, and the first end of the second bidirectional switch is also connected to the midpoint of another bridge arm circuit among the multiple bridge arm circuits, for controlling the connection status between the midpoints of the multiple bridge arm circuits.

[0014] In some embodiments, the power factor correction module includes a first bridge arm circuit and a second bridge arm circuit connected in parallel; the first bidirectional switch includes a first switch tube and a second switch tube, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the second end of the first switch tube is connected to the second end of the second switch tube, and the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits through the inductor.

[0015] In some embodiments, the second bidirectional switch includes a third switch tube and a fourth switch tube, and the third switch tube and the fourth switch tube are arranged back to back; the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the third switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits through the inductor, the second end of the third switch tube is connected to the second end of the fourth switch tube, and the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits.

[0016] In some embodiments, the first bridge arm circuit includes: a fifth switch tube and a first diode, the second end of the fifth switch tube is connected to the anode of the first diode, and there is a first node between the second end of the fifth switch tube and the anode of the first diode to serve as the midpoint of the first bridge arm circuit among the multiple bridge arm circuits, and the first midpoint is connected to the first end of the second switch tube and the first end of the third switch tube through the inductor.

[0017] In some embodiments, the second bridge arm circuit includes: a sixth switch tube and a second diode, the first end of the sixth switch tube is connected to the first end of the fifth switch tube, the second end of the sixth switch tube is connected to the anode of the second diode, the cathode of the second diode is connected to the cathode of the first diode, and there is a second node between the anode of the second diode and the second end of the sixth switch tube to serve as the midpoint of the second bridge arm circuit among the multiple bridge arm circuits.

[0018] In some embodiments, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube respectively include a switch tube structure and a body diode connected in reverse parallel to the switch tube structure.

[0019] In some embodiments, the on-board charger further includes: a capacitor, wherein the capacitor is located between the power factor correction module and the DC conversion module.

[0020] In some embodiments, the on-board charger further includes: a controller, which is connected to the power factor correction module and the DC conversion module and is used to control the working modes of the power factor correction module and the DC conversion module.

[0021] In some embodiments, the on-board charger further includes: a collection module connected to the controller and configured to collect the input AC power signal and the DC power signal of the battery.

[0022] A second aspect of the present invention provides a charging control method for the vehicle-mounted charger described in the above embodiment, the charging control method comprising: obtaining a first DC power signal based on the DC power signal of the battery connected to the DC conversion module; controlling the power factor correction module to perform step-up and step-down processing on the input AC power signal based on the first DC power signal and the input AC power signal of the power factor correction module.

[0023] According to the charging control method of the embodiment of the present invention, after obtaining the first DC power signal, the first DC power signal is compared with the AC power signal of the input power factor correction module, and the power factor correction module is controlled to perform step-up and step-down processing on the input AC power signal according to the comparison result, so as to ensure that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always works at a high-efficiency working point, realizes full-voltage high-efficiency operation, reduces losses, and realizes high frequency.

[0024] In some embodiments, the first DC signal is obtained according to a DC signal of a battery connected to the DC conversion module, a preset fixed gain value of the DC conversion module, and the number of turns of a transformer coil of the DC conversion module.

[0025] In some embodiments, based on the first DC signal and the input AC signal of the power factor correction module, the power factor correction module is controlled to perform step-up and step-down processing on the input AC signal, including: when the absolute value of the input AC signal is less than the first DC signal, the power factor correction module is controlled to step up the input AC signal; or when the absolute value of the input AC signal is greater than the first DC signal, the power factor correction module is controlled to step down the input AC signal.

[0026] In some embodiments, when the absolute value of the input AC power signal is less than the first DC power signal, the power factor correction module is controlled to perform a voltage boost process on the input AC power signal, including: when the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the second switch tube of the power factor correction module is controlled to be in a closed state, the fifth switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are controlled to be in an open state or The first switch tube and the second switch tube are in a closed state to realize the boosting of the input AC power signal; wherein, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for being connected to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0027] In some embodiments, when the absolute value of the input AC power signal is less than the first DC power signal, the power factor correction module is controlled to perform a voltage boost process on the input AC power signal, including: when the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the first switch tube of the power factor correction module is controlled to be in a closed state, and the sixth switch tube of the power factor correction module is controlled to switch alternately, and the second switch tube and the fifth switch tube of the power factor correction module are in an open state. Or it is in a closed state to achieve a boost on the input AC power signal; wherein the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for being connected to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0028] In some embodiments, when the absolute value of the input AC power signal is greater than the first DC power signal, the power factor correction module is controlled to perform voltage reduction processing on the input AC power signal, including: when the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the fourth switch tube and the fifth switch tube of the power factor correction module are controlled to be in an open state, and the third switch tube of the power factor correction module is controlled to be in a closed state, and the second switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are controlled to be in a closed state. state or in a disconnected state to achieve the step-down of the input AC power signal; wherein the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for being connected to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0029] In some embodiments, when the absolute value of the input AC power signal is greater than the first DC power signal, the power factor correction module is controlled to perform voltage reduction processing on the input AC power signal, including: when the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the third switch tube and the sixth switch tube of the power factor correction module are controlled to be in an open state, and the fourth switch tube of the power factor correction module is controlled to be in a closed state, and the first switch tube of the power factor correction module is controlled to be alternately switched, and the second switch tube and the fifth switch tube of the power factor correction module are controlled to be in a closed state. state or in a disconnected state to achieve the step-down of the input AC power signal; wherein the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for being connected to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0030] A third aspect of the present invention provides an electronic device, comprising: at least one processor; a memory communicatively connected to the at least one processor; the memory storing a computer program executable by the at least one processor, wherein the at least one processor implements the charging control method described in the above embodiment when executing the computer program.

[0031] According to the electronic device of the embodiment of the present invention, the corresponding charging control program can be stored in the memory. When implementing the charging control method, the processor runs the program in the memory, and controls the power factor correction module to perform step-up and step-down processing on the input AC power signal according to the first DC power signal and the input AC power signal of the power factor correction module, thereby ensuring that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always operates at a high-efficiency operating point, realizes full-voltage high-efficiency operation, reduces losses, and realizes high frequency.

[0032] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the charging control method described in the above embodiment when executed.

[0033] A fourth aspect of the present invention provides a vehicle, comprising a battery and the on-board charger described in the above embodiment, wherein the on-board charger is connected to the battery.

[0034] In a vehicle according to an embodiment of the present invention, the on-board charger obtains a first DC signal and an input AC signal when charging a battery, and controls the power factor correction module to perform step-up and step-down processing on the input AC signal according to the first DC signal and the input AC signal of the power factor correction module, thereby ensuring that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always operates at a high-efficiency operating point, achieving full-voltage high-efficiency operation, reducing losses, achieving high frequency, and reducing the size of the on-board charger.

[0035] 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

[0036] 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: Figure 1 is a schematic diagram of a vehicle charger according to an embodiment of the present invention; Figure 2 is a schematic diagram of a power factor correction module according to an embodiment of the present invention; Figure 3 is a topological diagram of a vehicle charger according to an embodiment of the present invention; Figure 4 is a flow chart of a charging control method according to an embodiment of the present invention; Figure 5 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Figure 6 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Figure 7 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Figure 8 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Fig. 9 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Fig.10 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Fig.11 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Fig.12 is a schematic diagram of the current flow of a vehicle charger according to an embodiment of the present invention; Fig.13 is a structural block diagram of an electronic device according to an embodiment of the present invention; Fig.14 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0037] Reference numerals: Vehicle 400; electronic device 300; On-vehicle charger 100; battery 402; processor 301; memory 302; Power factor correction module 110; DC conversion module 120; capacitor 130; controller 140; first acquisition module 150; second acquisition module 160; Bidirectional switch unit 200; inductor 210; first bidirectional switch 220; second bidirectional switch 230; first bridge arm circuit 111; second bridge arm circuit 112; first switch tube 221; second switch tube 222; third switch tube 231; fourth switch tube 232; fifth switch tube 101; first diode 102; first node 103; sixth switch tube 104; second diode 105; second node 106. DETAILED DESCRIPTION

[0038] 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.

[0039] In the existing technology, OBC (On Board Charger) mostly adopts the combination of PFC (Power Factor Correction) and DC conversion module. The current product PFC is a boost circuit, which can only boost the voltage and has a small adjustable range. It has high requirements for the voltage regulation of the subsequent DC conversion module, is difficult to design, and has adjustable gain, large loss and low efficiency.

[0040] In order to solve the above problems, an embodiment of the first aspect of the present invention provides a vehicle-mounted charger, which can increase the adjustable voltage range of the power factor correction module. The DC conversion module presets a fixed gain value, which can ensure that the DC conversion module does not need to adjust the voltage over a wide range, can achieve full voltage and high-efficiency operation, and can reduce the size of the vehicle-mounted charger.

[0041] like Figure 1 As shown, the on-board charger 100 of the first embodiment of the present invention includes: a power factor correction module 110 and a DC conversion module 120 .

[0042] Among them, the input end of the power factor correction module 110 is suitable for connecting to a power supply, for performing step-up and step-down processing on the input AC signal and outputting a first DC signal; the input end of the DC conversion module 120 is connected to the output end of the power factor correction module 110, and the output end of the DC conversion module 120 is suitable for connecting to a battery, for converting the first DC signal into a DC signal of the battery, and the ratio of the DC signal of the battery to the first DC signal is a preset fixed gain value.

[0043] Specifically, the first DC signal can be understood as an electrical signal output by the power factor correction module 110 after the input AC signal is bucked and reduced; the gain in the circuit is an important parameter to measure the circuit amplification capability, which is usually defined as the ratio of the amplitude of the output signal to the amplitude of the input signal. According to different types of gain, it can be voltage gain, current gain, power gain or other forms of gain. The realization of current gain usually depends on specific electronic components, such as transistors or operational amplifiers. These components can efficiently control the current gain through proper biasing and circuit design; when the on-board charger 100 is charging the battery, the power factor correction module 110 performs buck-boost processing on the AC signal input by the power supply. If the AC signal input by the power supply is greater than the electrical signal required for battery charging, it is bucked; if the AC signal input by the power supply is less than the electrical signal required for battery charging, it is boosted. The on-board charger 100 performs buck-boost processing on the input AC signal and then outputs a first DC signal to the DC conversion module 120. The DC conversion module 120 converts the first DC signal into a DC signal of the battery through a preset fixed gain value.

[0044] For example, the present invention adopts a front-stage buck-boost power factor correction module to increase the adjustable voltage range of the power factor correction module, and adopts a fixed-gain DC conversion module in the back stage (the original and secondary voltage gains are fixed), which can effectively reduce the transformer volume of the DC conversion module (taking LLC as an example, the transformer design in LLC (LLC Resonant Converter) needs to take into account the lowest frequency in frequency modulation, so the transformer will be larger in design), reduce losses, improve efficiency, and meet a wide range of voltage outputs.

[0045] According to the on-board charger of the embodiment of the present invention, the power factor correction module can perform step-up and step-down processing on the input AC power signal, thereby increasing the adjustable voltage range. Therefore, the subsequent DC conversion module does not have to adopt a large voltage adjustment range, and the volume of the subsequent tributary conversion module can be reduced, that is, the volume of the on-board charger is reduced; and the DC conversion module adopts a preset fixed gain value, which makes it possible for the DC conversion module to operate at a high-efficiency operating point. The on-board charger can achieve full-voltage high-efficiency operation, reduce losses, and achieve high frequency.

[0046] In some embodiments, the preset fixed gain value corresponds to the DC conversion module operating at an ideal efficiency operating point, wherein the ideal efficiency operating point is an operating point at which the working efficiency of the DC conversion module is higher than the efficiency threshold. In an embodiment, the efficiency threshold can be a relatively high value. In other words, the ideal efficiency operating point can be a high efficiency operating point of the DC conversion module, that is, when the on-board charger is working, the DC conversion module can always operate at a high efficiency operating point, so that the DC conversion module does not need a wide range of voltage regulation, has low loss and high efficiency, and is easy to achieve high frequency. The DC-DC transformer is small in size, which can reduce the volume of the entire OBC.

[0047] Specifically, the preset fixed gain value of the DC conversion module 120 generally refers to setting the gain of the module to a specific value, which corresponds to the gain of the DC conversion module 120 when it operates at an ideal efficiency point. The ideal efficiency operating point may refer to the operating state of the DC conversion module 120 with minimal energy loss and highest efficiency when converting electrical energy.

[0048] In some embodiments, Figure 2 As shown, the power factor correction module 110 includes: a plurality of bridge arm circuits and a bidirectional switch unit 200 .

[0049] In which, each bridge arm circuit has a midpoint; the bidirectional switch unit 200 is connected to the midpoints of multiple bridge arm circuits, and the bidirectional switch unit 200 is also suitable for being connected to a power supply to control the connection status between multiple bridge arm circuits and the power supply, and / or, to control the connection status between the midpoints of multiple bridge arm circuits to achieve step-up and step-down processing of the input AC signal.

[0050] Specifically, the bridge arm circuit is a circuit that converts alternating current into direct current, and is mainly composed of electronic diodes. When the input is alternating current, the direction of the current will change continuously. Through the unidirectional conductivity of the diode, the bridge arm circuit can convert this unstable alternating current into a relatively stable direct current. When the current is in the positive half cycle, the current flows through the diode from one direction, and when the current is in the negative half cycle, the current flows through the diode from the other direction; the bidirectional switch unit 200 allows current to flow in both directions and prevents current backflow when the power is off. After the power supply inputs an alternating current signal, the input alternating current signal is bucked and stepped up by controlling the on and off of the bidirectional switch unit 200. After the input alternating current signal passes through multiple bridge arm circuits, the alternating current input by the power supply is converted into a direct current signal.

[0051] In some embodiments, Figure 2 As shown, the bidirectional switch unit 200 includes: an inductor 210 and a first bidirectional switch 220 .

[0052] Among them, the first end of the inductor 210 is connected to the midpoint of one bridge arm circuit among the multiple bridge arm circuits; the first end of the first bidirectional switch 220 is suitable for being connected to the first end of the power supply, and the second end of the first bidirectional switch 220 is connected to the second end of the inductor 210, which is used to control the connection status between the multiple bridge arm circuits and the power supply.

[0053] Specifically, the power supply is connected to multiple bridge arm circuits through the inductor 210 and the first bidirectional switch 220 in the bidirectional switch unit 200. The on and off of the first bidirectional switch 220 can control the connection state between the bridge arm circuit and the power supply, and convert the AC signal input by the power supply into a DC signal through multiple bridge arm circuits.

[0054] In some embodiments, Figure 2 As shown, the bidirectional switch unit 200 includes: a second bidirectional switch 230 .

[0055] Among them, the first end of the second bidirectional switch 230 is suitable for connecting to the second end of the power supply, the second end of the second bidirectional switch 230 is connected to the midpoint of one bridge arm circuit among the multiple bridge arm circuits through the inductor 210, and the first end of the second bidirectional switch 230 is also connected to the midpoint of another bridge arm circuit among the multiple bridge arm circuits, which is used to control the connection status between the midpoints of the multiple bridge arm circuits.

[0056] Specifically, the second bidirectional switch 230 is connected between the power supply and multiple bridge arm circuits to control the connection status between the midpoints of the multiple bridge arm circuits. The bridge arm circuit is usually composed of multiple switching devices, such as transistors, related diodes, resistors, capacitors and other components. Each bridge arm contains multiple switching devices for controlling the waveform and phase of the output voltage. The midpoint is the potential of a specific point in the bridge arm circuit, which is crucial to the performance and stability of the circuit. By adopting a suitable control method, it can be ensured that the circuit can operate stably and meet various application requirements.

[0057] In some embodiments, Figure 2 As shown, the power factor correction module 110 may include a first bridge arm circuit 111 and a second bridge arm circuit 112 ; the first bidirectional switch 220 includes a first switch tube 221 and a second switch tube 222 .

[0058] Among them, the first bridge arm circuit 111 and the second bridge arm circuit 112 are connected in parallel; the first switch tube 221 and the second switch tube 222 are arranged back to back, the first end of the first switch tube 221 is suitable for connecting to the first end of the power supply, the second end of the first switch tube 221 is connected to the second end of the second switch tube 222, and the first end of the second switch tube 222 is connected to the midpoint of the first bridge arm circuit 111 in the multiple bridge arm circuits through the inductor 210.

[0059] In some embodiments, Figure 2 As shown, the second bidirectional switch 230 includes a third switch tube 231 and a fourth switch tube 232 .

[0060] The third switch tube 231 and the fourth switch tube 232 are arranged back to back.

[0061] Specifically, the first end of the third switch tube 231 is connected to the first end of the second switch tube 222 and the inductor 210, the third switch tube 231 is connected to the midpoint of the first bridge arm circuit 111 among the multiple bridge arm circuits through the inductor 210, the second end of the third switch tube 231 is connected to the second end of the fourth switch tube 232, and the first end of the fourth switch tube 232 is connected to the second end of the power supply and the midpoint of the second bridge arm circuit 112 among the multiple bridge arm circuits.

[0062] In some embodiments, Figure 2 As shown, the first bridge arm circuit 111 includes: a fifth switch tube 101 and a first diode 102 .

[0063] Among them, the second end of the fifth switch tube 101 is connected to the anode of the first diode 102, and there is a first node 103 between the second end of the fifth switch tube 101 and the anode of the first diode 102 to serve as the midpoint of the first bridge arm circuit 111. The first midpoint is connected to the first end of the second switch tube 222 and the first end of the third switch tube 231 through the inductor 210.

[0064] In some embodiments, Figure 2 As shown, the second bridge arm circuit includes 112: a sixth switch tube 104 and a second diode 105.

[0065] Among them, the first end of the sixth switch tube 104 is connected to the first end of the fifth switch tube 101, the second end of the sixth switch tube 104 is connected to the anode of the second diode 105, the cathode of the second diode 105 is connected to the cathode of the first diode 102, and there is a second node 106 between the anode of the second diode 105 and the second end of the sixth switch tube 104 as the midpoint of the second bridge arm circuit 112.

[0066] In some embodiments, the first switch tube 221 , the second switch tube 222 , the third switch tube 231 , the fourth switch tube 232 , the fifth switch tube 101 and the sixth switch tube 104 respectively include a switch tube structure and a body diode connected in reverse parallel to the switch tube structure.

[0067] Specifically, in a circuit, a switch tube (e.g., a metal oxide semiconductor field effect transistor, a bipolar transistor) and its reverse parallel body diode are a common structure used to control the on and off of a circuit and handle reverse voltage; the switch tube structure is a core component in an electronic circuit, used to control the on and off of a circuit, and has the advantages of high input impedance, low drive power, and fast switching speed, and is widely used in various electronic circuits. The body diode is formed by the PN (PN junction) junction inside the switch tube. When the switch tube is in the off state, the body diode can withstand the reverse voltage, thereby protecting the switch tube from damage. At the same time, when the switch tube is turned on, the body diode is in a reverse cutoff state and will not affect the circuit.

[0068] In some embodiments, Figure 1 As shown, the on-board charger 100 further includes a capacitor 130 .

[0069] The capacitor 130 is located between the power factor correction module 110 and the DC conversion module 120 .

[0070] Specifically, capacitor 130 plays a key role between the power factor correction module 110 and the DC conversion module 120. Capacitor 130 mainly serves as an energy storage element to ensure that the DC conversion module 120 can receive stable and continuous DC input. In addition, capacitor 130 can also filter out high-frequency noise and harmonics to a certain extent, further improving the power supply quality.

[0071] In some embodiments, Figure 1 As shown, the on-board charger 100 further includes a controller 140 .

[0072] The controller 140 is connected to the power factor correction module 110 and the DC conversion module 120 , and is used to control the working modes of the power factor correction module 110 and the DC conversion module 120 .

[0073] Specifically, the controller 140 is responsible for coordinating and managing the work of each module to ensure that the on-board charger 100 operates efficiently and stably. The controller 140 needs to receive feedback signals (such as input voltage, output voltage, current, etc.) from the power factor correction module 110 and the DC conversion module 120 in real time, and adjust the working status of the power factor correction module 110 and the DC conversion module 120 according to these signals and a preset control algorithm.

[0074] In some embodiments, the on-board charger 100 further includes a collection module, which is connected to the controller 140 and is used to collect the input AC power signal of the on-board charger and the DC power signal of the battery.

[0075] In the embodiment, the acquisition module can be one acquisition module or two acquisition modules. Figure 1 As shown, the acquisition module may include a first acquisition module 150 and a second acquisition module 160 .

[0076] The first acquisition module 150 is connected to the controller 140 and is used to acquire input AC power signals; the second acquisition module 160 is connected to the controller 140 and is used to acquire DC power signals of the battery.

[0077] Specifically, the first acquisition module 150 acquires the input AC power signal of the power factor correction module 110, and sends the acquired input AC power signal to the controller 140; the second acquisition module 160 acquires the DC power signal of the battery, and sends the acquired DC power signal to the controller 140. The controller 140 compares the size of the input AC power signal with the DC power signal. If the input AC power signal is smaller than the DC power signal, the controller 140 controls the power factor correction module 110 to increase the voltage. If the input AC power signal is larger than the DC power signal, the controller 140 controls the power factor correction module 110 to reduce the voltage.

[0078] For example, the present invention adopts a buck-boost PFC + fixed gain DC conversion module architecture. The advantage is that the buck-boost PFC can ensure that the subsequent DC conversion module does not need a wide range of voltage regulation, and the fixed gain DC conversion module can always operate at a high efficiency working point position, with low loss and high efficiency, can meet a larger output voltage range, and can easily achieve high frequency. The DC conversion module transformer is small in size, which can reduce the size of the entire OBC.

[0079] The topology diagram of the on-board charger is as follows: Figure 3 As shown, according to the new buck-boost PFC topology, the PFC can complete the buck-boost function, a bidirectional switch is added at one end of the AC input (for example, two back-to-back switch tubes), and a bidirectional switch is added between the bidirectional switch and the inductor and at the other end of the AC input (for example, two back-to-back switch tubes); the two back-to-back switch tubes constitute a bidirectional switch, which allows current to flow in both directions and blocks voltage flow when power is off.

[0080] like Figure 1 The on-board charger shown in the figure is currently compatible with domestic and foreign power grids. The input voltage range of OBC is 85VAC~265VAC. The input voltage is converted to V by the buck-boost PFC module. PFC (first DC signal), and then pass through the fixed gain DC conversion module to get V battery (battery DC signal), the entire system samples V battery With input voltage V in (AC signal), makes certain comparisons, and controls the buck-boost PFC to complete the voltage boost and downshift to match the battery voltage based on the results.

[0081] Reference below Figure 4 A charging control method according to an embodiment of the second aspect of the present invention is described as follows: Figure 4 As shown, the method at least includes step S1 to step S2.

[0082] Step S1, obtaining a first direct current signal according to a direct current signal of a battery connected to a direct current conversion module.

[0083] Specifically, the DC conversion module is an electric energy conversion device that can convert one DC voltage into another DC voltage. When the on-board charger charges the battery, the power input is the AC signal of the on-board charger, and a DC signal is required to charge the battery. Therefore, it is necessary to obtain the DC signal of the battery connected to the DC conversion module. Since the DC conversion module presets a fixed gain value, the first DC signal can be calculated using the DC signal of the battery.

[0084] Step S2, controlling the power factor correction module to perform step-up and step-down processing on the input AC power signal according to the first DC power signal and the input AC power signal of the power factor correction module.

[0085] Specifically, after obtaining the first DC signal, the first DC signal is compared with the AC signal of the input power factor correction module, and the power factor correction module is controlled to perform step-up and step-down processing on the input AC signal according to the comparison result, so that the AC signal of the power supply input is converted into the first DC signal.

[0086] According to the charging control method of the embodiment of the present invention, after obtaining the first DC power signal, the first DC power signal is compared with the AC power signal of the input power factor correction module, and the power factor correction module is controlled to perform step-up and step-down processing on the input AC power signal according to the comparison result, so as to ensure that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always works at a high-efficiency working point, realizes full-voltage high-efficiency operation, reduces losses, and realizes high frequency.

[0087] In some embodiments, the first DC signal is obtained according to a DC signal of a battery connected to the DC conversion module, a preset fixed gain value of the DC conversion module, and the number of turns of a transformer coil of the DC conversion module.

[0088] Specifically, the DC conversion module is connected to the battery to first obtain the DC signal of the battery; the DC conversion module has a preset fixed gain value, which determines the proportional relationship between the output DC voltage and the input DC voltage, and the selection of the gain value is usually based on the battery characteristic design; the turns ratio of the transformer coil of the DC conversion module (i.e., the ratio of the turns of the primary coil to the secondary coil) is a key factor affecting the output voltage, and the amplitude of the output voltage can be changed by adjusting the turns ratio; after obtaining the DC signal of the battery, the preset fixed gain value and the turns of the transformer coil, the first DC signal is obtained according to calculation.

[0089] In some embodiments, a first DC power signal and an input AC power signal of a power factor correction module control the power factor correction module to perform step-up and step-down processing on the input AC power signal, including: when the absolute value of the input AC power signal is less than the first DC power signal, controlling the power factor correction module to step up the input AC power signal; or, when the absolute value of the input AC power signal is greater than the first DC power signal, controlling the power factor correction module to step down the input AC power signal.

[0090] Specifically, since the DC signal required for battery charging can be detected and obtained, and the preset fixed gain value and the number of turns of the transformer coil are available, the first DC signal can be obtained by calculation. After the first DC signal is calculated, the input AC signal is compared with the first DC signal. If the absolute value of the input AC signal is less than the first DC signal, in order to ensure the DC signal required for battery charging, the power factor correction module is controlled to boost the input AC signal; if the absolute value of the input AC signal is greater than the first DC signal, in order to ensure the DC signal required for battery charging, the power factor correction module is controlled to step down the input AC signal.

[0091] For example, if the primary-to-secondary turns ratio of the DC conversion module transformer is set to n, due to the fixed gain (gain is K), V PFC =KnV battery , where Kn is the preset fixed gain value; the on-board charger has two working states, one is V in <KnV battery , control the buck-boost PFC module to the boost mode, and set V PFC Stable control in KnV battery (V PFC =KnV battery ); Another working state is V in >KnV battery , control the buck-boost PFC module to buck mode, and set V PFC Stable control in KnV battery (V PFC =KnV battery ).

[0092] like Figure 3 In the application example shown, the rear stage is a fixed-frequency LLC topology, which is a mature topology, VPFC=KnVbattery, so the new PFC buck-boost topology proposed in the front stage is introduced. The front stage buck-boost topology has four working states, namely, boost and buck when the input is positive, and boost and buck when the input is negative.

[0093] In some embodiments, when the absolute value of the input AC power signal is less than the first DC power signal, the power factor correction module is controlled to perform a voltage boost processing on the input AC power signal, including: when the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the second switch tube of the power factor correction module is controlled to be in a closed state, the fifth switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are in an open state or in a closed state, so as to achieve a voltage boost on the input AC power signal.

[0094] Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0095] Specifically, when the input AC signal is in the positive half cycle and the absolute value V of the input AC signal is in <KnV battery (The power factor correction module needs to be boosted), the third switch tube and the fourth switch tube are in the open state, the second switch tube is in the closed state, and the fifth switch tube is controlled to switch alternately; the circuit can be regarded as a BOOST (boost circuit) to complete the boost, and the input-output relationship is V PFC =V in / (1-D), where D is the duty cycle of the fifth switch tube. Since the switch tube includes a body diode connected in reverse parallel to the switch tube structure, when the positive electrode voltage of the body diode is higher than the negative electrode voltage, even if the switch tube structure is in an open state, current can be transmitted through the body diode, and in the embodiment, controlling the switch tube to be closed or opened can be a switch control of the switch tube structure in the switch tube, so the first switch tube and the sixth switch tube can be normally open or normally closed.

[0096] When the fifth switch is turned off, V PFC =V in , at this time, the capacitor is charged, and the current flow is as follows Figure 5 As shown, since the third switch tube and the fourth switch tube are in the open state and the second switch tube is in the closed state, the current input by the power supply can only flow to the capacitor through the first switch tube and the second switch tube, and then flow back to the power supply through the sixth switch tube, thereby forming a loop to charge the capacitor.

[0097] When the fifth switch is closed, the current flows as follows Figure 6 As shown, when the fifth switch tube is closed, the current output by the power supply passes through the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube and then returns to the power supply and cannot charge the capacitor; at this time, the capacitor discharges so that the output voltage of the power factor correction module increases.

[0098] In some embodiments, when the absolute value of the input AC power signal is less than the first DC power signal, the power factor correction module is controlled to boost the input AC power signal, including: when the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the first switch tube of the power factor correction module is controlled to be in a closed state, and the sixth switch tube of the power factor correction module is controlled to switch alternately, and the second switch tube and the fifth switch tube of the power factor correction module are in an open state or in a closed state, so as to achieve boosting of the input AC power signal.

[0099] Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0100] Specifically, when the input AC signal is in the negative half cycle, it can be found that the circuit is positively and negatively symmetrical, and the operating principle is the same as the positive half cycle. The absolute value of the input AC signal V in <KnV battery (The power factor correction module needs to be boosted), the third switch tube and the fourth switch tube are in the off state, the first switch tube is normally closed, and the sixth switch tube is switched on and off alternately; the circuit can be regarded as a BOOST circuit to complete the boost, and the input-output relationship is V PFC =V in / (1-D), where D is the duty cycle of the sixth switch. The second switch and the fifth switch can be normally open or normally closed. When the switch is an IGBT (Insulate-Gate Bipolar Transistor) parallel diode switch, the on-off control is meaningless. When the switch is a MOS switch, controlling the switch to be normally closed will reduce the voltage drop on the MOS and reduce the loss.

[0101] When the sixth switch is turned off, V PFC =V in , at this time, the capacitor is charged, and the current flow is as follows Figure 7 As shown, since the third switch tube and the fourth switch tube are in the disconnected state, the current input by the power supply can only flow to the capacitor through the second diode, and then flow back to the power supply through the fifth switch tube, the second switch tube and the first switch tube, thereby forming a loop to charge the capacitor.

[0102] When the sixth switch is closed, the current flows as follows Figure 8 As shown, when the sixth switch tube is closed, the current output by the power supply passes through the sixth switch tube, the fifth switch tube, the second switch tube and the first switch tube and then returns to the power supply and cannot charge the capacitor; at this time, the capacitor discharges so that the output voltage of the power factor correction module increases.

[0103] In some embodiments, when the absolute value of the input AC power signal is greater than the first DC power signal, the power factor correction module is controlled to perform voltage reduction processing on the input AC power signal, including: when the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the fourth switch tube and the fifth switch tube of the power factor correction module are controlled to be in an open state, and the third switch tube of the power factor correction module is controlled to be in a closed state, and the second switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are in a closed state or in an open state, so as to achieve voltage reduction of the input AC power signal.

[0104] Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0105] Specifically, when the input AC signal is in the positive half cycle, the absolute value V of the input AC signal is in >KnV battery (The power factor correction module needs to be stepped down), the fourth switch tube and the fifth switch tube are in the open state, the third switch tube is in the closed state, and the second switch tube is switched on and off alternately. The circuit can be regarded as a BUCK (step-down circuit) circuit to complete the step-down, and the input-output relationship is V PFC =V in D, where D is the duty cycle of the second switch tube. The first switch tube and the sixth switch tube can be normally open or normally closed. When the switch is an IGBT parallel diode switch, the on-off control is meaningless. When the switch is a MOS tube switch, controlling the switch to be normally closed will reduce the voltage drop on the MOS and reduce the loss.

[0106] When the second switch is closed, the current flows as follows Fig. 9As shown, since the fourth switch tube and the fifth switch tube are in the open state and the third switch tube is in the closed state, the current input by the power supply can only flow to the capacitor through the first switch tube and the second switch tube, and then flow back to the power supply through the sixth switch tube, thereby forming a loop to charge the capacitor.

[0107] When the second switch is turned off, the current flows to Fig.10 As shown, when the second switch tube is disconnected, the capacitor discharges, and the capacitor discharge current passes through the sixth switch tube, the fourth switch tube, and the third switch tube to the inductor, and then flows through the first diode back to the capacitor. Since the inductor consumes current, it plays a role in reducing the voltage.

[0108] In some embodiments, when the absolute value of the input AC power signal is greater than the first DC power signal, the power factor correction module is controlled to perform voltage reduction processing on the input AC power signal, including: when the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the third switch tube and the sixth switch tube of the power factor correction module are controlled to be in an open state, and the fourth switch tube of the power factor correction module is controlled to be in a closed state, and the first switch tube of the power factor correction module is controlled to switch alternately, and the second switch tube and the fifth switch tube of the power factor correction module are controlled to be in a closed state or in an open state, so as to achieve voltage reduction of the input AC power signal.

[0109] Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

[0110] Specifically, when the input AC signal is in the negative half cycle, the absolute value V of the input AC signal is in >KnV battery (The power factor correction module needs to be stepped down), the third switch tube and the sixth switch tube are in the open state, the fourth switch tube is in the closed state, and the first switch tube is switched on and off alternately. The topology can be regarded as a BUCK to complete the step-down. The input-output relationship is V PFC =V in D, where D is the duty cycle of the first switch tube. The second switch tube and the fifth switch tube can be normally open or normally closed. When the switch is an IGBT parallel diode switch, the on-off control is meaningless. When the switch is a MOS tube switch, controlling the switch to be normally closed will reduce the voltage drop on the MOS and reduce the loss.

[0111] When the first switch is closed, the current flows as follows Fig.11 As shown, since the third switch tube and the sixth switch tube are in the open state, and the first switch tube is in the closed state, the current input by the power supply can only flow to the capacitor through the second diode. Then the power flows back to the power supply through the fifth switch tube, the second switch tube and the first switch tube, thereby forming a loop to charge the capacitor.

[0112] When the first switch is turned off, the current flows to Fig.12 As shown, when the first switch tube is disconnected, the capacitor discharges, and the capacitor discharge current passes through the fifth switch tube, then flows through the inductor, and then flows through the third switch tube, the fourth switch tube and the second diode, and then flows back to the capacitor. Since the inductor consumes current, it plays a role in reducing the voltage.

[0113] A third aspect of the present invention provides an electronic device, such as Fig.13 As shown, the electronic device 300 includes: at least one processor 301 and a memory 302 .

[0114] Among them, at least one processor 301 is in communication connection with the memory 302, and the memory 302 stores a computer program that can be executed by the at least one processor 301. When the at least one processor 301 executes the computer program, the charging control method is implemented.

[0115] According to the electronic device of the embodiment of the present invention, the corresponding charging control program can be stored in the memory. When implementing the charging control method, the processor runs the program in the memory, and controls the power factor correction module to perform step-up and step-down processing on the input AC power signal according to the first DC power signal and the input AC power signal of the power factor correction module, thereby ensuring that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always operates at a high-efficiency operating point, realizes full-voltage high-efficiency operation, reduces losses, and realizes high frequency.

[0116] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements a charging control method when executed.

[0117] A fifth aspect of the present invention provides a vehicle, such as Fig.14 As shown, the vehicle 400 includes: an on-board charger 100 and a battery 402 The on-board charger 100 is connected to the battery 402 .

[0118] In a vehicle according to an embodiment of the present invention, the on-board charger obtains a first DC signal and an input AC signal when charging a battery, and controls the power factor correction module to perform step-up and step-down processing on the input AC signal according to the first DC signal and the input AC signal of the power factor correction module, thereby ensuring that the DC conversion module does not need to adjust the voltage over a wide range, so that the DC conversion module always operates at a high-efficiency operating point, achieving full-voltage high-efficiency operation, reducing losses, achieving high frequency, and reducing the size of the on-board charger.

[0119] In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code including one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0120] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0121] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0122] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0123] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0124] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0125] 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, substrates, 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 representations of the above terms do not necessarily refer to the same embodiment or example.

[0126] 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 vehicle-mounted charger, characterized in that: include: A power factor correction module, wherein the input end of the power factor correction module is suitable for connecting to a power source, and is used to perform step-up and step-down processing on the input AC power signal and output a first DC power signal; A DC conversion module, wherein the input end of the DC conversion module is connected to the output end of the power factor correction module, and the output end of the DC conversion module is suitable for being connected to a battery, and is used to convert the first DC signal into a DC signal of the battery, and the ratio of the DC signal of the battery to the first DC signal is a preset fixed gain value.

2. The vehicle-mounted charger according to claim 1, characterized in that: The preset fixed gain value corresponds to the DC conversion module operating at an ideal efficiency operating point, where the ideal efficiency operating point is an operating point where the operating efficiency of the DC conversion module is higher than an efficiency threshold.

3. The vehicle-mounted charger according to claim 1 or 2, characterized in that: The power factor correction module comprises: A plurality of bridge arm circuits, each of the bridge arm circuits having a midpoint; A bidirectional switch unit, wherein the bidirectional switch unit is connected to the midpoints of the multiple bridge arm circuits, and the bidirectional switch unit is also suitable for being connected to the power supply, and is used to control the connection status between the multiple bridge arm circuits and the power supply, and / or, to control the connection status between the midpoints of the multiple bridge arm circuits, so as to achieve step-up and step-down processing of the input AC signal.

4. The vehicle-mounted charger according to claim 3, characterized in that: The bidirectional switch unit comprises: an inductor, a first end of the inductor being connected to a midpoint of one bridge arm circuit among the plurality of bridge arm circuits; A first bidirectional switch, wherein a first end of the first bidirectional switch is suitable for being connected to a first end of the power supply, and a second end of the first bidirectional switch is connected to a second end of the inductor, and is used to control a connection state between the multiple bridge arm circuits and the power supply.

5. The vehicle-mounted charger according to claim 4, characterized in that: The bidirectional switch unit also includes: A second bidirectional switch, wherein the first end of the second bidirectional switch is suitable for being connected to the second end of the power supply, the second end of the second bidirectional switch is connected to the midpoint of one bridge arm circuit among the multiple bridge arm circuits through the inductor, and the first end of the second bidirectional switch is also connected to the midpoint of another bridge arm circuit among the multiple bridge arm circuits, for controlling the connection status between the midpoints of the multiple bridge arm circuits.

6. The vehicle-mounted charger according to claim 5, characterized in that: The power factor correction module comprises a first bridge arm circuit and a second bridge arm circuit connected in parallel; The first bidirectional switch includes a first switch tube and a second switch tube, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the second end of the first switch tube is connected to the second end of the second switch tube, and the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits through the inductor.

7. The vehicle-mounted charger according to claim 6, characterized in that: The second bidirectional switch includes a third switch tube and a fourth switch tube, and the third switch tube and the fourth switch tube are arranged back to back; The first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the third switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits through the inductor, the second end of the third switch tube is connected to the second end of the fourth switch tube, and the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits.

8. The vehicle-mounted charger according to claim 7, characterized in that: The first bridge arm circuit comprises: A fifth switch tube and a first diode, wherein the second end of the fifth switch tube is connected to the anode of the first diode, and a first node is provided between the second end of the fifth switch tube and the anode of the first diode to serve as the midpoint of the first bridge arm circuit among the multiple bridge arm circuits, and the first midpoint is connected to the first end of the second switch tube and the first end of the third switch tube through the inductor.

9. The vehicle-mounted charger according to claim 8, characterized in that: The second bridge arm circuit comprises: A sixth switch tube and a second diode, wherein the first end of the sixth switch tube is connected to the first end of the fifth switch tube, the second end of the sixth switch tube is connected to the anode of the second diode, the cathode of the second diode is connected to the cathode of the first diode, and a second node is provided between the anode of the second diode and the second end of the sixth switch tube to serve as the midpoint of the second bridge arm circuit among the multiple bridge arm circuits.

10. The vehicle-mounted charger according to claim 9, characterized in that: The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube respectively include a switch tube structure and a body diode connected in reverse parallel to the switch tube structure.

11. The vehicle-mounted charger according to claim 1 or 2, characterized in that: The vehicle-mounted charger also includes: A capacitor is located between the power factor correction module and the DC conversion module.

12. The vehicle-mounted charger according to claim 1 or 2, characterized in that: The vehicle-mounted charger also includes: A controller is connected to the power factor correction module and the DC conversion module, and is used to control the working modes of the power factor correction module and the DC conversion module.

13. The vehicle-mounted charger according to claim 12, characterized in that: The vehicle-mounted charger also includes: The acquisition module is connected to the controller and is used to acquire the input AC power signal and the DC power signal of the battery.

14. A charging control method, characterized in that: For the on-board charger according to any one of claims 1 to 13, the charging control method comprises: Obtaining a first direct current signal according to a direct current signal of a battery connected to the direct current conversion module; The power factor correction module is controlled according to the first direct current signal and the input alternating current signal of the power factor correction module to perform step-up and step-down processing on the input alternating current signal.

15. The charging control method according to claim 14, characterized in that: The first DC signal is obtained according to the DC signal of the battery connected to the DC conversion module, the preset fixed gain value of the DC conversion module and the number of turns of the transformer coil of the DC conversion module.

16. The charging control method according to claim 14 or 15, characterized in that: According to the first direct current signal and the input alternating current signal of the power factor correction module, controlling the power factor correction module to perform step-up and step-down processing on the input alternating current signal includes: When the absolute value of the input AC power signal is smaller than the first DC power signal, controlling the power factor correction module to perform voltage boost processing on the input AC power signal; Alternatively, when the absolute value of the input AC power signal is greater than the first DC power signal, the power factor correction module is controlled to perform voltage reduction processing on the input AC power signal.

17. The charging control method according to claim 16, characterized in that: When the absolute value of the input AC power signal is smaller than the first DC power signal, controlling the power factor correction module to perform voltage boost processing on the input AC power signal includes: In the case where the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the second switch tube of the power factor correction module is controlled to be in a closed state, the fifth switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are in an open state or in a closed state, so as to achieve a voltage boost of the input AC power signal; Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

18. The charging control method according to claim 16, characterized in that: When the absolute value of the input AC power signal is smaller than the first DC power signal, controlling the power factor correction module to perform voltage boost processing on the input AC power signal includes: In the case where the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is less than the first DC power signal, the third switch tube and the fourth switch tube of the power factor correction module are controlled to be in an open state, the first switch tube of the power factor correction module is controlled to be in a closed state, and the sixth switch tube of the power factor correction module is controlled to switch alternately, and the second switch tube and the fifth switch tube of the power factor correction module are in an open state or in a closed state, so as to achieve a voltage boost of the input AC power signal; Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

19. The charging control method according to claim 16, characterized in that: When the absolute value of the input AC power signal is greater than the first DC power signal, controlling the power factor correction module to perform voltage reduction processing on the input AC power signal includes: In the case where the input AC power signal is in a positive half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the fourth switch tube and the fifth switch tube of the power factor correction module are controlled to be in an open state, and the third switch tube of the power factor correction module is controlled to be in a closed state, and the second switch tube of the power factor correction module is controlled to switch alternately, and the first switch tube and the sixth switch tube of the power factor correction module are in a closed state or in an open state, so as to realize the voltage reduction of the input AC power signal; Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

20. The charging control method according to claim 16, characterized in that: When the absolute value of the input AC power signal is greater than the first DC power signal, controlling the power factor correction module to perform voltage reduction processing on the input AC power signal includes: In the case where the input AC power signal is in a negative half cycle, when the absolute value of the input AC power signal is greater than the first DC power signal, the third switch tube and the sixth switch tube of the power factor correction module are controlled to be in an open state, and the fourth switch tube of the power factor correction module is controlled to be in a closed state, and the first switch tube of the power factor correction module is controlled to switch alternately, and the second switch tube and the fifth switch tube of the power factor correction module are in a closed state or in an open state, so as to realize the voltage reduction of the input AC power signal; Among them, the first switch tube and the second switch tube are arranged back to back, the first end of the first switch tube is suitable for connecting to the first end of the power supply, the first end of the second switch tube is connected to the midpoint of the first bridge arm circuit among the multiple bridge arm circuits of the power factor correction module through the inductor, the third switch tube and the fourth switch tube are arranged back to back, the first end of the third switch tube is connected to the first end of the second switch tube and the inductor, the first end of the fourth switch tube is connected to the second end of the power supply and the midpoint of the second bridge arm circuit among the multiple bridge arm circuits, the fifth switch tube is the switch tube in the first bridge arm circuit, and the sixth switch tube is the switch tube in the second bridge arm circuit.

21. An electronic device, characterized in that: include: at least one processor; a memory communicatively coupled to the at least one processor; The memory stores a computer program that can be executed by the at least one processor, and when the at least one processor executes the computer program, the charging control method according to any one of claims 14 to 20 is implemented.

22. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the charging control method according to any one of claims 14 to 20 is implemented.

23. A vehicle, characterized in that: It comprises a battery and the on-board charger according to any one of claims 1 to 13, wherein the on-board charger is connected to the battery.

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