Boost charging system and new energy automobile

Abstract

The invention relates to the technical field of battery charging, and discloses a boost charging system and a new energy automobile, the system comprises a charging device, a control module, an electrical switch module and a motor module, the motor module comprises a power driving tube assembly and two three-phase motor systems or a six-phase motor system; the electrical switch module is respectively connected with the charging equipment, the control module and a winding of the motor module, and the control module is respectively connected with the electrical switch module and the motor module; the control module sends a switching signal and a power driving signal based on a preset boost charging mode. The electrical switch module receives the switch signal and is turned on or turned off; and the motor module receives the power driving signal and drives a power driving tube of the motor module based on the power driving signal so as to charge the storage battery according to a boost charging mode based on charging and discharging of a winding in the motor module. The problem that extra cost is increased by an extra series connection system in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging, and in particular to a boost charging system and a new energy vehicle. Background Art

[0002] With the trend of higher voltage batteries for new energy vehicles, the original low-voltage charging equipment needs to use a specific boosting device to charge the battery.

[0003] In the prior art, the boost charging method based on the integration of a single motor control system is to connect an additional inductor in series with the motor winding as a boost inductor. The characteristic of this method is that some components of the controller are shared, such as the power switch tube, current sensor, motor winding, control and drive power supply. In other words, the additional series-connected inductor can provide the system with greater boost charging power, but it adds additional cost. Summary of the invention

[0004] In view of this, the present invention provides a boost charging system and a new energy vehicle to solve the problem of additional cost increased by the additional series-connected system in the prior art.

[0005] In a first aspect, the present invention provides a boost charging system, the system comprising: a charging device, a control module, an electrical switch module and a motor module, wherein the motor module comprises: a power switch tube assembly, and two three-phase motor systems or one six-phase motor system, the three-phase motor system comprises three windings, and the six-phase motor system comprises six windings;

[0006] The electrical switch module is respectively connected to the charging device, the control module and the winding of the motor module, and the control module is respectively connected to the electrical switch module and the motor module;

[0007] A control module, used for sending a switch signal and a power drive signal respectively based on a preset boost charging mode;

[0008] An electrical switch module, for receiving a switch signal and turning it on or off;

[0009] The motor module is used to receive a power drive signal and drive a power drive tube of the motor module based on the power drive signal, so as to charge the battery in a boost charging mode based on the charging and discharging of the windings in the motor module.

[0010] The dual-motor control system can make full use of the winding inductance of the two motors. The two power units and the two motors share the charging power, reducing the loss and heat of a single power unit and a single motor to protect the devices, and greatly improving the boost charging power without the need for additional power inductance.

[0011] In an optional implementation, the preset boost charging mode includes: a non-boost charging mode and a power charging mode, and the electrical switch module includes:

[0012] An output switch unit, wherein a first end of the output switch unit is connected to the charging device, and a second end of the output switch unit is connected to the positive output end;

[0013] A boost switch unit, wherein a first end of the boost switch unit is connected to a first end of the output switch unit, and a second end of the boost switch unit is connected to a winding of the motor module;

[0014] Wherein, in the non-boost charging mode, the output switch unit is closed and the boost switch unit is disconnected;

[0015] In the power charging mode, the boost switch unit is closed and the output switch unit is opened.

[0016] In an optional implementation, the two three-phase motor systems include: a first three-phase motor system and a second three-phase motor system, and the power charging mode includes: a first low-power charging mode, a second low-power charging mode, and a high-power charging mode;

[0017] The output switch unit includes:

[0018] A first switch device, wherein a control end of the first switch device is connected to the control module, a first end of the first switch device is connected to the charging device, and a second end of the first switch device is connected to the positive output end;

[0019] The boost switch unit includes:

[0020] a second switch device, wherein a control end of the second switch device is connected to the control module, a first end of the second switch device is connected to a first end of the first switch device, and a second end of the second switch device is connected to a winding of the first three-phase motor system;

[0021] a third switch device, wherein a control end of the third switch device is connected to the control module, a first end of the third switch device is connected to a first end of the first switch device, and a second end of the third switch device is connected to a winding of the second three-phase motor system;

[0022] Wherein, in the non-boost charging mode, the first switch device is closed, and the second switch device and the third switch device are opened;

[0023] In the first low-power charging mode, the second switch device is closed, and the first switch device and the third switch device are opened;

[0024] In the second low-power charging mode, the third switch device is closed, and the first switch device and the second switch device are opened;

[0025] In the high-power charging mode, the second switch device and the third switch device are closed, and the first switch device is opened.

[0026] In an optional implementation, the preset boost charging mode further includes: a non-charging mode, and the electrical switch module further includes:

[0027] a fourth switch device, wherein a control end of the fourth switch device is connected to the control module, a first end of the fourth switch device is connected to the charging device, and a second end of the fourth switch device is connected to the first end of the first switch device;

[0028] a fifth switch device, wherein a control end of the fifth switch device is connected to the control module, a first end of the fifth switch device is connected to the charging device, and a second end of the fifth switch device is connected to the negative output end;

[0029] In the non-charging mode, the first switching device, the second switching device, the third switching device, the fourth switching device, and the fifth switching device are turned off.

[0030] In an optional implementation, the first three-phase motor system includes:

[0031] A full-bridge circuit consisting of a first winding, a second winding, a third winding, a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube and a sixth power switch tube;

[0032] The first end of the first winding, the first end of the second winding and the first end of the third winding are connected to the second end of the second switch device, the second end of the first winding is respectively connected to the second end of the first power switch tube and the second end of the fourth power switch tube, the second end of the second winding is respectively connected to the second end of the second power switch tube and the second end of the fifth power switch tube, and the second end of the third winding is respectively connected to the second end of the third power switch tube and the second end of the sixth power switch tube;

[0033] The first end of the first power switch tube, the first end of the second power switch tube and the first end of the third power switch tube are connected to the positive output end, and the first end of the fourth power switch tube, the first end of the fifth power switch tube and the first end of the sixth power switch tube are connected to the negative output end.

[0034] In an optional implementation, the second three-phase motor system includes:

[0035] A full-bridge circuit consisting of a fourth winding, a fifth winding, a sixth winding, a seventh power switch tube, an eighth power switch tube, a ninth power switch tube, a tenth power switch tube, an eleventh power switch tube and a twelfth power switch tube;

[0036] The first end of the fourth winding, the first end of the fifth winding, and the first end of the sixth winding are connected to the second end of the third switch device, the second end of the fourth winding is respectively connected to the second end of the seventh power switch tube and the second end of the tenth power switch tube, the second end of the fifth winding is respectively connected to the second end of the eighth power switch tube and the second end of the eleventh power switch tube, and the second end of the sixth winding is respectively connected to the second end of the ninth power switch tube and the second end of the twelfth power switch tube;

[0037] The first end of the seventh power switch tube, the first end of the eighth power switch tube and the first end of the ninth power switch tube are connected to the positive output end, and the first end of the tenth power switch tube, the first end of the eleventh power switch tube and the first end of the twelfth power switch tube are connected to the negative output end.

[0038] In an optional embodiment, the system further includes:

[0039] The current collection unit is connected to the winding and the control module respectively, and is used to transmit the collected current information to the control module.

[0040] In an optional embodiment, the system further includes:

[0041] The filter module is connected to the charging device, the positive output terminal and the negative output terminal.

[0042] In an optional implementation, the filtering module includes:

[0043] a first capacitor, wherein a first end of the first capacitor is connected to a first end of the charging device, and a second end of the first capacitor is connected to a second end of the charging device;

[0044] A second capacitor, wherein a first end of the second capacitor is connected to the positive output end, and a second end of the second capacitor is connected to the negative output end.

[0045] In a second aspect, the present invention provides a new energy vehicle, which includes the above-mentioned boost charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a conventional boost charging system;

[0048] Figure 2 It is another conventional boost charging system;

[0049] Figure 3 is a structural diagram of a boost charging system according to an embodiment of the present invention;

[0050] Figure 4 is a structural diagram of another boost charging system according to an embodiment of the present invention;

[0051] Figure 5 is a charging mode flow chart of a boost charging system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0056] In the prior art, there are two boost charging methods based on the integration of a single motor control system. The first method is referred to as Figure 1, using a single motor winding such as single-phase, two-phase or three-phase as a boost inductor. The characteristic of this method is that some components of the controller are shared, such as power switch tubes, current sensors, motor windings, control and drive units, etc. However, the boost charging power of the first method is low and the charging current ripple is large. The second method is referenced Figure 2 The characteristic of this method is that some components of the controller are shared, such as power switch tubes, current sensors, motor windings, control and drive power supplies. In other words, the additional series inductor can provide the system with greater boost charging power, but it adds additional costs.

[0057] In this regard, a boost charging system is provided in this embodiment, such as Figure 3 As shown, the system includes: a charging device U1, a control module 10, an electrical switch module 20 and a motor module 30, wherein the motor module 30 includes: two three-phase motor systems or one six-phase motor system, the three-phase motor system includes three windings, and the six-phase motor system includes six windings; that is, the motor module 30 includes 6 windings, three windings constitute a three-phase winding, and the other three windings constitute another three-phase winding, and the motor module 30 also includes a power drive tube assembly.

[0058] The electrical switch module 20 is connected to the windings of the charging device U1, the control module 10 and the motor module 30 respectively, and the control module 10 is connected to the electrical switch module 20 and the motor module 30 respectively;

[0059] Specifically, the motor module 30 has two built-in three-phase motor systems, and the AC side of each three-phase motor system is connected to the charging device U1 through a three-phase winding. Optionally, each three-phase motor system is a three-phase full-bridge structure, and each bridge arm is connected in series by at least two power drive tubes, and the midpoint of each bridge arm is connected to a winding of a corresponding phase in a three-phase winding. The control module 10 is connected to the power drive tube in each three-phase motor system. The control module 10 controls the charging and discharging operations of the corresponding winding of the power drive tube by controlling the shutdown and conduction of the power drive tube.

[0060] A control module 10, configured to send a switch signal and a power drive signal respectively based on a preset boost charging mode;

[0061] Specifically, the control module 10 can be a control chip such as MCU (Microcontroller Unit), DSP, FPGA, etc. It should be noted that the control module 10 has at least 12 control output ports. Optionally, the control module 10 is composed of two units, one is a chip for controlling the power drive tube, and the other is a power control unit of the host computer. Of course, the control module 10 can also be integrated in one chip.

[0062] The electrical switch module 20 is used to receive a switch signal and turn it on or off;

[0063] Specifically, the electrical switch module 20 receives the switch signal of the control module 10 to turn on or off, thereby realizing the control of the boost power. Specifically, it includes charging without boost or charging with a specific boost power value. Optionally, the electrical switch module 20 can be a switch with a control terminal, not limited to a relay or a power drive tube.

[0064] The motor module 30 is used to receive a power driving signal and drive a power driving tube of the motor module based on the power driving signal, so as to charge the battery in a boost charging mode based on the charging and discharging of the windings in the motor module.

[0065] Specifically, the control module 10 controls the power drive tube assembly of the electrical switch module 20 and the motor module 30 at the same time, so as to charge the battery according to different boost charging modes. It is worth noting that the power drive tube assembly of the motor module 30 is the power drive tube assembly of the motor in the motor module 30, wherein the control module 10 controls the electrical switch module 20, which is mainly used for switching the boost charging mode, and the control module 10 controls the power drive tube of the motor module 30, which is mainly used for charging and discharging operations of specific windings among the six windings. It can be understood that the windings of the motor are used as inductors for charging and discharging.

[0066] The motor module 30 includes two groups of three-phase motor systems, or the two groups of three-phase motor systems are replaced by a six-phase motor system. The motor module 30 includes 6 windings. Of course, the motor module 30 can also be multiple motor systems such as multiple three-phase motor systems or multiple six-phase motor systems, so as to achieve different power boosts based on the control of multiple motors.

[0067] The windings of the motor module 30 are the windings inside the two three-phase motors, or the windings inside the six-phase motor are directly used, without adding additional windings, which saves costs to a great extent. The six windings inside the two three-phase motors, or the six windings of a six-phase motor, and the power drive tubes corresponding to each winding are used to realize multi-phase staggered control and solve the problem of large charging current ripple. At the same time, the windings of the dual motors are used to bear the boost charging power, which solves the problem of single windings, single power switches or single motors that are prone to overheating and failure.

[0068] In some optional embodiments, the preset boost charging mode includes: a non-boost charging mode and a power charging mode, and the electrical switch module 20 includes:

[0069] An output switch unit, wherein a first end of the output switch unit is connected to the charging device, and a second end of the output switch unit is connected to the positive output end;

[0070] Specifically, the output switch unit is a switch device on the high-voltage positive circuit, and the output switch unit is used to control the charging mode of power boost and non-boost.

[0071] A boost switch unit, wherein a first end of the boost switch unit is connected to a first end of the output switch unit, and a second end of the boost switch unit is connected to a winding of the motor module;

[0072] Specifically, the boost switch unit is used to control the magnitude of the specific boost power. Optionally, the boost switch unit may specifically include one switch or multiple switches. For example, when the motor module 30 is two three-phase motor systems, the boost switch unit includes at least two switch devices, thereby controlling the two three-phase motor systems respectively to achieve the specific boost power value. When the motor module 30 is a six-phase motor system, the boost switch unit includes at least one switch device.

[0073] Wherein, in the non-boost charging mode, the output switch unit is closed and the boost switch unit is disconnected;

[0074] In the power charging mode, the boost switch unit is closed and the output switch unit is opened.

[0075] Specifically, the non-boost charging mode refers to charging without boosting power, that is, direct charging. In other words, based on the cooperation of the boost switch unit and the output switch unit, the direct charging or boost charging mode is controlled.

[0076] In some optional embodiments, such as Figure 4 As shown, the two three-phase motor systems include: a first three-phase motor system and a second three-phase motor system, and the power charging modes include: a first low-power charging mode, a second low-power charging mode and a high-power charging mode;

[0077] The output switch unit includes:

[0078] A first switch device K1, wherein a control end of the first switch device K1 is connected to the control module 10, a first end of the first switch device K1 is connected to the charging device U1, and a second end of the first switch device K1 is connected to the positive output end;

[0079] Specifically, the control module 10 controls the on and off of the first switch device K1 , and the first switch device K1 may be a relay.

[0080] The boost switch unit includes:

[0081] A second switch device K2, wherein a control end of the second switch device K2 is connected to the control module 10, a first end of the second switch device K2 is connected to a first end of the first switch device K1, and a second end of the second switch device K2 is connected to a winding of the first three-phase motor system;

[0082] Specifically, the control module 10 controls the on and off of the second switch device K2, which may be a relay. If the motor module 30 is a six-phase motor system, the boost switch unit only includes the second switch device K2, thereby realizing the on and off of the boost mode.

[0083] A third switch device K3, wherein a control end of the third switch device K3 is connected to the control module 10, a first end of the third switch device K3 is connected to a first end of the first switch device K1, and a second end of the third switch device K3 is connected to a winding of the second three-phase motor system;

[0084] Specifically, the control module 10 controls the on and off of the third switch device K3 , and the third switch device K3 may be a relay.

[0085] Wherein, in the non-boost charging mode, the first switch device K1 is closed, and the second switch device K2 and the third switch device K3 are opened;

[0086] In the first low-power charging mode, the second switch device K2 is closed, and the first switch device K1 and the third switch device K3 are opened;

[0087] In the second low-power charging mode, the third switch device K3 is closed, and the first switch device K1 and the second switch device K2 are opened;

[0088] In the high-power charging mode, the second switch device K2 and the third switch device K3 are closed, and the first switch device K1 is opened.

[0089] In some optional embodiments, such as Figure 4 and Figure 5 As shown, the preset boost charging mode also includes: a non-charging mode, and the electrical switch module 20 also includes:

[0090] A fourth switch device K4, wherein a control end of the fourth switch device K4 is connected to the control module 10, a first end of the fourth switch device K4 is connected to the charging device U1, and a second end of the fourth switch device K4 is connected to a first end of the first switch device K1;

[0091] Specifically, the control module 10 controls the on and off of the fourth switch device K4, which may be a relay. The fourth switch device K4 serves as a main switch to control the on and off of the charging circuit.

[0092] A fifth switch device K5, wherein a control end of the fifth switch device K5 is connected to the control module 10, a first end of the fifth switch device K5 is connected to the charging device U1, and a second end of the fifth switch device K5 is connected to the negative output end;

[0093] Specifically, the control module 10 controls the on and off of the fifth switch device K5, and the fourth switch device K4 can be a relay. The fifth switch device K5 is a switch device on the high-voltage negative circuit. It should be noted that the fifth switch device K5 is omitted to save costs, and the fifth switch device K5 is directly replaced by a wire.

[0094] The function of the first switch device K1 is: when the output voltage of the charging device U1 is higher than the voltage across the battery, the second switch device K2 and the third switch device K3 are disconnected, and the fifth switch device K5 is closed. After closing the first switch device K1, the charging device U1 can directly transmit the charging output current Iout to charge the battery, that is, the function of the charging device directly charging the battery is retained.

[0095] In addition, a current sensor can be added on the input side to detect the charging current Iin of the charging device U1, and a current sensor can also be added on the output side to detect the charging output current Iout. Normally, Iin and Iout serve as input signals of the control module 10 to provide additional control and monitoring functions for the system.

[0096] In the non-charging mode, the first switching device K1 , the second switching device K2 , the third switching device K3 , the fourth switching device K4 and the fifth switching device K5 are turned off.

[0097] It should be noted that the non-charging mode is a non-charging mode.

[0098] refer to Figure 5 , the charging modes include the following four.

[0099] Step S1 is a non-charging mode, in which the first switch device K1, the second switch device K2, the third switch device K3, the fourth switch device K4 and the fifth switch device K5 are disconnected. At this time, the A motor (i.e., the first three-phase motor system) operates normally under the drive of the power drive unit A (i.e., the power drive tube of the first three-phase motor system), and the B motor (i.e., the second three-phase motor system) operates normally under the drive of the power drive unit B (i.e., the power drive tube of the second three-phase motor system).

[0100] Step S2 is direct charging mode 1 (i.e. non-boost charging mode), the fourth switch device K4, the first switch device K1 and the fifth switch device K5 are closed, the second switch device K2 and the third switch device K3 are opened, and the charging device U1 directly outputs Vout and Iout to charge the battery.

[0101] Step S3 is high-power boost charging mode 2 (i.e., high-power charging mode), the first switch device K1 is disconnected, the second switch device K2, the third switch device K3, the fourth switch device K4 and the fifth switch device K5 are closed, and the charging device U1 outputs the charging output voltage Vout and the charging output current Iout to charge the battery through the combination of the A motor and the B motor and the power drive unit A and the power drive unit B into a boost charging system.

[0102] Step S4 is the low-power boost charging mode 3 (i.e., the first low-power charging mode), in which the second switch device K2, the fourth switch device K4, and the fifth switch device K5 are closed, and the first switch device K1 and the third switch device K3 are opened. The charging device U1 outputs the charging output voltage Vout and the charging output current Iout to charge the battery through the A motor and the power drive unit A combined into a boost charging system.

[0103] Step S5 is the low-power boost charging mode 4 (i.e., the second low-power charging mode), in which the third switch device K3, the fourth switch device K4, and the fifth switch device K5 are closed, and the first switch device K1 and the second switch device K2 are disconnected. The charging device U1 outputs the charging output voltage Vout and the charging output current Iout to charge the battery through the combination of the B motor and the power drive unit B into a boost charging system.

[0104] Step S6 is to end the charging mode by turning off the first switch device K1 , the second switch device K2 , the third switch device K3 , the fourth switch device K4 and the fifth switch device K5 .

[0105] Select a single motor or dual motor charging circuit according to the actual boost charging power demand. When the charging power demand is small, select a single power unit integrated with a single motor winding for charging control. When the charging power demand is large, select two power units integrated with two motor windings to perform boost charging. It should be noted that the battery charging mode does not need to be based on Figure 5 The order in can be switched arbitrarily.

[0106] In some optional embodiments, such as Figure 4 As shown, the first three-phase motor system includes:

[0107] A full-bridge circuit consisting of a first winding L1, a second winding L2, a third winding L3, a first power switch tube Q1, a second power switch tube Q2, a third power switch tube Q3, a fourth power switch tube Q4, a fifth power switch tube Q5 and a sixth power switch tube Q6;

[0108] Of course, only one or two windings among the first winding L1 , the second winding L2 , and the third winding L3 may be connected.

[0109] The first end of the first winding L1, the first end of the second winding L2 and the first end of the third winding L3 are connected to the second end of the second switch device K2, the second end of the first winding L1 is respectively connected to the second end of the first power switch tube Q1 and the second end of the fourth power switch tube Q4, the second end of the second winding L2 is respectively connected to the second end of the second power switch tube Q2 and the second end of the fifth power switch tube Q5, and the second end of the third winding L3 is respectively connected to the second end of the third power switch tube Q3 and the second end of the sixth power switch tube Q6;

[0110] The first end of the first power switch tube Q1, the first end of the second power switch tube Q2 and the first end of the third power switch tube Q3 are connected to the positive output end, and the first end of the fourth power switch tube Q4, the first end of the fifth power switch tube Q5 and the first end of the sixth power switch tube Q6 are connected to the negative output end.

[0111] Specifically, the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, the fourth power switch tube Q4, the fifth power switch tube Q5 and the sixth power switch tube Q6 of the first three-phase motor system are used as power switches for boost charging. Figure 4 The control module 10 outputs control signals G1 to G6 to respectively control the opening and closing of the first power switch tube Q1, the second power switch tube Q2, the third power switch tube Q3, the fourth power switch tube Q4, the fifth power switch tube Q5 and the sixth power switch tube Q6.

[0112] The charging device U1 forms a boost charging circuit based on the first three-phase motor system:

[0113] In the first circuit mode, the circuit for charging the first winding L1 is: charging device U1->fourth switch device K4->second switch device K2->first winding L1->fourth power switch tube Q4->fifth switch device K5->charging device U1. The circuit for the first winding L1 to boost and charge the battery is: charging device U1->fourth switch device K4->second switch device K2->first winding L1->first power switch tube Q1->output end.

[0114] In the second circuit mode, the circuit for charging the second winding L2 is: charging device U1->fourth switch device K4->second switch device K2->second winding L2->fifth power switch tube Q5->fifth switch device K5->charging device U1. The circuit for the second winding L2 to boost and charge the battery is: charging device U1->fourth switch device K4->second switch device K2->second winding L2->second power switch tube Q2->output end.

[0115] In the third circuit mode, the circuit for charging the third winding L3 is: charging device U1->fourth switch device K4->second switch device K2->third winding L3->sixth power switch tube Q6->fifth switch device K5->charging device U1. The circuit for the third winding L3 to boost and charge the battery is: charging device U1->fourth switch device K4->second switch device K2->third winding L3->third power switch tube Q3->output end.

[0116] It should be noted that the boost charging system can be composed of any combination of the first circuit mode, the second circuit mode and the third circuit mode.

[0117] In some optional embodiments, such as Figure 4 As shown, the second three-phase motor system includes:

[0118] a full-bridge circuit consisting of a fourth winding L4, a fifth winding L5, a sixth winding L6, a seventh power switch tube Q7, an eighth power switch tube Q8, a ninth power switch tube Q9, a tenth power switch tube Q10, an eleventh power switch tube Q11 and a twelfth power switch tube Q12, wherein the second end of the fourth winding L4 is respectively connected to the second end of the seventh power switch tube Q7 and the second end of the tenth power switch tube Q10, the second end of the fifth winding L5 is respectively connected to the second end of the eighth power switch tube Q8 and the second end of the eleventh power switch tube Q11, and the second end of the sixth winding L6 is respectively connected to the second end of the ninth power switch tube Q9 and the second end of the twelfth power switch tube Q12;

[0119] Of course, it is also possible to connect only one or two windings among the fourth winding L4, the fifth winding L5, and the sixth winding L6.

[0120] A first end of the fourth winding L4, a first end of the fifth winding L5, and a first end of the sixth winding L6 are connected to a second end of the third switching device K3;

[0121] The first end of the seventh power switch tube Q7, the first end of the eighth power switch tube Q8 and the first end of the ninth power switch tube Q9 are connected to the positive output end, and the first end of the tenth power switch tube Q10, the first end of the eleventh power switch tube Q11 and the first end of the twelfth power switch tube Q12 are connected to the negative output end.

[0122] Specifically, the seventh power switch tube Q7, the eighth power switch tube Q8, the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11 and the twelfth power switch tube Q12 of the second three-phase motor system are used as power switches for boost charging. Figure 4The control module 10 outputs control signals G7 to G12 to respectively control the opening and closing of the seventh power switch tube Q7, the eighth power switch tube Q8, the ninth power switch tube Q9, the tenth power switch tube Q10, the eleventh power switch tube Q11 and the twelfth power switch tube Q12.

[0123] The charging device U1 forms a boost charging circuit based on the second three-phase motor system:

[0124] In the fourth circuit mode, the circuit for charging the fourth winding L4 is: charging device U1->fourth switch device K4->second switch device K2->fourth winding L4->tenth power switch tube Q10->fifth switch device K5->charging device U1. The circuit for the fourth winding L4 to boost and charge the battery is: charging device U1->fourth switch device K4->second switch device K2->fourth winding L4->seventh power switch tube Q7->output end.

[0125] In the fifth circuit mode, the circuit for charging the fifth winding L5 is: charging device U1->fourth switch device K4->second switch device K2->fifth winding L5->eleventh power switch tube Q11->fifth switch device K5->charging device U1. The circuit for the fifth winding L5 to boost and charge the battery is: charging device U1->fourth switch device K4->second switch device K2->fifth winding L5->eighth power switch tube Q8->output end.

[0126] In the sixth circuit mode, the circuit for charging the sixth winding L6 is: charging device U1->fourth switch device K4->second switch device K2->sixth winding L6->twelfth power switch tube Q12->fifth switch device K5->charging device U1. The circuit for boosting and charging the battery by the sixth winding L6 is: charging device U1->fourth switch device K4->second switch device K2->sixth winding L6->ninth power switch tube Q9->output end.

[0127] It should be noted that the boost charging system can be composed of any combination of the fourth circuit mode, the fifth circuit mode and the sixth circuit mode. Of course, the boost charging system can be composed of any combination of the first circuit mode, the second circuit mode and the third circuit mode, the fourth circuit mode, the fifth circuit mode and the sixth circuit mode.

[0128] In some optional embodiments, such as Figure 4 As shown, the system also includes:

[0129] The current collection unit A1 is connected to the winding and the control module 10 respectively, and is used to transmit the collected current information to the control module.

[0130] The current acquisition unit A1 is respectively connected to the second end of the first winding L1, the second end of the second winding L2, the second end of the third winding L3, the second end of the fourth winding L4, the second end of the fifth winding L5, the second end of the sixth winding L6 and the control module 10.

[0131] Specifically, the current acquisition unit A1 respectively acquires the current of the first winding L1, the second winding L2, the third winding L3, the fourth winding L4, the fifth winding L5 and the sixth winding L6 through coupling connection and transmits them to the control module 10. Optionally, the current acquisition unit A1 may be a current sensor.

[0132] The control module 10 also collects the charging output voltage Vout and outputs the G1-G6 control signals to the power drive unit A to realize the staggered phase control of the first loop mode, the second loop mode and the third loop mode, so as to realize smaller charging current ripple. At the same time, the control module 10 also collects the charging output voltage Vout and outputs the G7-G12 control signals to the power drive unit B to realize the staggered phase control of the fourth loop mode, the fifth loop mode and the sixth loop mode, so as to realize smaller charging current ripple. Of course, the staggered phase control of the first loop mode, the second loop mode and the third loop mode, the fourth loop mode, the fifth loop mode and the sixth loop mode can also be realized.

[0133] In some optional embodiments, the system further comprises:

[0134] The filter module is connected to the charging device U1, the positive output terminal and the negative output terminal.

[0135] Specifically, when the distance between the charging device U1 and the charging output terminal is far, interference is avoided and the effect of wave smoothing is achieved.

[0136] In some optional embodiments, such as Figure 4 As shown, the filtering module includes:

[0137] A first capacitor C1, wherein a first end of the first capacitor C1 is connected to a first end of the charging device U1, and a second end of the first capacitor C1 is connected to a second end of the charging device U1;

[0138] Specifically, the first capacitor C1 is used to smooth the voltage output by the charging device U1.

[0139] A second capacitor C2, wherein a first end of the second capacitor C2 is connected to the positive output end, and a second end of the second capacitor C2 is connected to the negative output end.

[0140] Specifically, the second capacitor C2 is used to smooth the voltage received by the battery.

[0141] In this embodiment, the present invention provides a new energy vehicle, which includes the boost charging system and battery as above. When the boost charging mode is input on the new energy vehicle, the non-boost charging mode, the first low-power charging mode, the second low-power charging mode and the high-power charging mode are respectively realized. The control module can be a control system for a new energy vehicle. By using the windings provided inside the two three-phase motors, or directly using the windings provided inside the six-phase motor, there is no need to add additional windings, which saves costs to a great extent. The six windings inside the two three-phase motors, or the six windings of a six-phase motor, and the power drive tubes corresponding to each winding are applied to realize multi-phase dislocation control and solve the problem of large charging current ripple. At the same time, the windings of the dual motors are used to bear the boost charging power, which solves the problem of single windings, single power switches or single motors being prone to overheating and failure.

[0142] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A boost charging system, characterized in that: The system comprises: a charging device, a control module, an electrical switch module and a motor module, wherein the motor module comprises: a power drive tube assembly, and two three-phase motor systems or one six-phase motor system, wherein the three-phase motor system comprises three windings, and the six-phase motor system comprises six windings; The electrical switch module is respectively connected to the charging device, the control module and the winding of the motor module, and the control module is respectively connected to the electrical switch module and the motor module; The control module is used to send a switch signal and a power drive signal respectively based on a preset boost charging mode; The electrical switch module is used to receive the switch signal and turn it on or off; The motor module is used to receive the power drive signal and drive the power drive tube of the motor module based on the power drive signal, so as to charge the battery according to the boost charging mode based on the charging and discharging of the windings in the motor module.

2. The system according to claim 1, characterized in that The preset boost charging mode includes: a non-boost charging mode and a power charging mode, and the electrical switch module includes: An output switch unit, wherein a first end of the output switch unit is connected to the charging device, and a second end of the output switch unit is connected to the positive output end; A boost switch unit, wherein a first end of the boost switch unit is connected to a first end of the output switch unit, and a second end of the boost switch unit is connected to a winding of the motor module; Wherein, in the non-boost charging mode, the output switch unit is closed and the boost switch unit is opened; In the power charging mode, the boost switch unit is closed and the output switch unit is opened.

3. The system according to claim 2, characterized in that The two three-phase motor systems include: a first three-phase motor system and a second three-phase motor system, and the power charging mode includes: a first low-power charging mode, a second low-power charging mode and a high-power charging mode; The output switch unit comprises: a first switch device, wherein a control end of the first switch device is connected to the control module, a first end of the first switch device is connected to the charging device, and a second end of the first switch device is connected to the positive output end; The boost switch unit comprises: a second switch device, wherein a control end of the second switch device is connected to the control module, a first end of the second switch device is connected to a first end of the first switch device, and a second end of the second switch device is connected to a winding of the first three-phase motor system; a third switch device, wherein a control end of the third switch device is connected to the control module, a first end of the third switch device is connected to a first end of the first switch device, and a second end of the third switch device is connected to a winding of the second three-phase motor system; Wherein, in the non-boost charging mode, the first switch device is closed, and the second switch device and the third switch device are opened; In the first low-power charging mode, closing the second switch device and opening the first switch device and the third switch device; In the second low-power charging mode, closing the third switch device and opening the first switch device and the second switch device; In the high-power charging mode, the second switch device and the third switch device are closed, and the first switch device is opened.

4. The system according to claim 3, characterized in that The preset boost charging mode also includes: a non-charging mode, and the electrical switch module also includes: a fourth switch device, wherein a control end of the fourth switch device is connected to the control module, a first end of the fourth switch device is connected to the charging device, and a second end of the fourth switch device is connected to the first end of the first switch device; a fifth switch device, wherein a control end of the fifth switch device is connected to the control module, a first end of the fifth switch device is connected to the charging device, and a second end of the fifth switch device is connected to the negative output end; In a non-charging mode, the first switching device, the second switching device, the third switching device, the fourth switching device, and the fifth switching device are turned off.

5. The system according to claim 3, characterized in that The first three-phase motor system comprises: A full-bridge circuit consisting of a first winding, a second winding, a third winding, a first power switch tube, a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube and a sixth power switch tube; The first end of the first winding, the first end of the second winding and the first end of the third winding are connected to the second end of the second switch device, the second end of the first winding is respectively connected to the second end of the first power switch tube and the second end of the fourth power switch tube, the second end of the second winding is respectively connected to the second end of the second power switch tube and the second end of the fifth power switch tube, and the second end of the third winding is respectively connected to the second end of the third power switch tube and the second end of the sixth power switch tube; The first end of the first power switch tube, the first end of the second power switch tube and the first end of the third power switch tube are connected to the positive output end, and the first end of the fourth power switch tube, the first end of the fifth power switch tube and the first end of the sixth power switch tube are connected to the negative output end.

6. The system according to claim 3, characterized in that The second three-phase motor system comprises: A full-bridge circuit consisting of a fourth winding, a fifth winding, a sixth winding, a seventh power switch tube, an eighth power switch tube, a ninth power switch tube, a tenth power switch tube, an eleventh power switch tube and a twelfth power switch tube; The first end of the fourth winding, the first end of the fifth winding, and the first end of the sixth winding are connected to the second end of the third switch device, the second end of the fourth winding is respectively connected to the second end of the seventh power switch tube and the second end of the tenth power switch tube, the second end of the fifth winding is respectively connected to the second end of the eighth power switch tube and the second end of the eleventh power switch tube, and the second end of the sixth winding is respectively connected to the second end of the ninth power switch tube and the second end of the twelfth power switch tube; The first end of the seventh power switch tube, the first end of the eighth power switch tube and the first end of the ninth power switch tube are connected to the positive output end, and the first end of the tenth power switch tube, the first end of the eleventh power switch tube and the first end of the twelfth power switch tube are connected to the negative output end.

7. The system according to claim 1, characterized in that The system further comprises: A current collection unit is connected to the winding and the control module respectively, and is used to transmit the collected current information to the control module.

8. The system according to claim 1, characterized in that The system further comprises: A filter module is connected to the charging device, the positive output terminal and the negative output terminal.

9. The system according to claim 8, characterized in that The filtering module comprises: a first capacitor, wherein a first end of the first capacitor is connected to a first end of the charging device, and a second end of the first capacitor is connected to a second end of the charging device; A second capacitor, wherein a first end of the second capacitor is connected to the positive output end, and a second end of the second capacitor is connected to the negative output end.

10. A new energy vehicle, characterized in that: The new energy vehicle comprises the boost charging system as described in any one of claims 1 to 9.

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