CN115149606A - Energy conversion system and power system - Google Patents

Energy conversion system and power system Download PDF

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Publication number
CN115149606A
CN115149606A CN202210741419.7A CN202210741419A CN115149606A CN 115149606 A CN115149606 A CN 115149606A CN 202210741419 A CN202210741419 A CN 202210741419A CN 115149606 A CN115149606 A CN 115149606A
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CN
China
Prior art keywords
switch
motor
module
battery module
voltage
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Pending
Application number
CN202210741419.7A
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Chinese (zh)
Inventor
李迎
马文武
王超
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Huawei Digital Power Technologies Co Ltd
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Huawei Digital Power Technologies Co Ltd
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Priority to CN202210741419.7A priority Critical patent/CN115149606A/en
Publication of CN115149606A publication Critical patent/CN115149606A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides an energy conversion system and a power system. The energy conversion system comprises a control module, a first switch, a second switch, a motor and a motor driving module. The control module is used for controlling the first switch to be switched off and the second switch to be switched on when the voltage of the power supply is greater than the voltage of the battery module, and controlling the motor driving module to drive the motor based on the input voltage provided by the power supply so as to charge the battery module. By adopting the method and the device, the charging current is increased, the charging power is improved and the charging efficiency can be improved by conducting the corresponding closed loop.

Description

Energy conversion system and power system
Technical Field
The application relates to the technical field of power electronics, in particular to a power conversion system and a power system.
Background
Currently, when the voltage of the power supply device is greater than the voltage of the charging device, the power supply device may adjust the voltage of the power supply device to be close to or equal to the voltage of the charging device for charging. However, this charging method limits the current capability of the output of the power supply device, and the output current of the power supply device is less than or equal to the maximum value, resulting in low charging efficiency. For example, the upper limit of the voltage of the battery module in the vehicle is 400V, the voltage range of the charging pile is 200V-750V, the maximum value of the output current of the charging pile is 250A, and the charging power can be 350V/250A at the maximum considering that the large current charging cannot be performed when the battery is fully charged.
Disclosure of Invention
The embodiment of the application discloses energy conversion system and driving system, through the switch turn-off or switch-on of control energy conversion system to and control motor drive module, can form corresponding closed circuit, charge or discharge to battery module, and improved the power of charging or discharging, can improve charging efficiency of battery charging outfit.
In a first aspect, an embodiment of the present application discloses an energy conversion system. The energy conversion system comprises a control module, a first switch, a second switch, a motor and a motor driving module. The first end of the battery module is connected with the first end of the motor driving module, the second end of the motor driving module is connected with the second end of the battery module through the first switch, the first end and the second end of the motor driving module are connected with the two ends of the power supply in parallel, the third end of the motor driving module is connected with the first end of the motor, and the second end of the motor is connected with the second end of the battery module through the second switch. The control module is used for controlling the first switch to be switched off and the second switch to be switched on when the voltage of the power supply is greater than the voltage of the battery module, and controlling the motor driving module to drive the motor based on the input voltage provided by the power supply so as to charge the battery module. It can be understood that if the first switch is turned off and the second switch is turned on, the power supply may form a closed loop with the battery module, the second switch, the motor, and the motor driving module, so that the input current of the power supply may flow into the motor and the battery module through the closed loop. At the moment, the motor is in a charging state, and the motor can form another closed loop with the motor driving module, the battery module and the second switch, so that the battery module can be charged through the motor, the charging current of the battery module is increased, and the charging efficiency of the battery module can be improved.
The control module may include, but is not limited to, a control board, a control chip, or a controller. Illustratively, the control module may include a Battery Management System (BMS), a Micro Control Unit (MCU), a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, and the like.
The battery module may be a single cell or a stack of cells, including but not limited to a high voltage battery (also referred to as a power cell) and a low voltage battery (also referred to as a low voltage battery). The high voltage battery may refer to a power source that provides a power source for an electric vehicle, and may include, but is not limited to, a ternary lithium battery, a lithium iron phosphate battery, and other high voltage batteries. The energy conversion system can simultaneously drive the motor and charge the battery module, or independently drive the motor, or independently charge the battery module in a single-phase or three-phase manner, so that the working efficiency and flexibility of the power system can be improved, the structure is simpler, the integration level is high, and the cost is low; in addition, the energy conversion system can integrate the motor and the vehicle-mounted charger without using a high-voltage distribution box, so that the number of high-voltage components used in the power system is reduced, the cost is lower, and the applicability is higher.
In some possible implementations, the control module is further configured to control the second switch to be turned off and the first switch to be turned on when the voltage of the power supply is less than or equal to the voltage of the battery module, and control the motor driving module not to drive the motor based on the input voltage provided by the power supply, so as to charge the battery module. So, power supply's output current can directly charge to battery module based on not passing through the closed circuit that motor drive module and motor correspond, can improve battery module's charge efficiency.
In some possible implementations, the motor driving module includes a plurality of bridge arms connected in parallel, a first parallel connection end of the plurality of bridge arms is a first end of the motor driving module, a second parallel connection end of the plurality of bridge arms is a second end of the motor driving module, and a bridge arm midpoint of one of the plurality of bridge arms is a third end of the motor driving module; the bridge arm comprises a third switch and a fourth switch which are connected in series, and the series connection point of the third switch and the fourth switch of the bridge arm is the bridge arm midpoint of the bridge arm; the motor comprises a plurality of windings with one ends connected in parallel, one end of one winding in the plurality of windings is used as a first end of the motor to be connected with the middle point of one bridge arm in the plurality of bridge arms, and the parallel connection ends of the plurality of windings are used as the second end of the motor. Therefore, the bridge arm switches in the bridge arms can be controlled to be switched on or switched off, and the corresponding closed loop is formed by the bridge arm switches and the first switch or the second switch, so that the charging efficiency of the battery module can be improved.
The switches corresponding to the third switch and the fourth switch in each bridge arm may be referred to as bridge arm switches. The bridge arm switch may be a metal-oxide-semiconductor field-effect transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) made of silicon semiconductor material (silicon, si), silicon carbide (SiC) of third generation wide bandgap semiconductor material, or gallium nitride (GaN), or diamond (diamond), or zinc oxide (ZnO), or other materials, and is not limited herein. The specific circuit topology of the multiple bridge arms in the motor driving module may be determined according to an actual application scenario, for example, a two-level topology structure or a multi-level topology structure, which is not limited herein.
It should be noted that the third switch and the fourth switch in the same bridge arm may be in an off state at the same time, but may not be in an on state at the same time. That is, when the third switch of the bridge arm is in the on state, the fourth switch of the bridge arm may be in the off state. Or the third switch in the same bridge arm and the fourth switch of the bridge arm are in a complementary wave-sending relationship. For example, when the third switch of the first leg is on, the fourth switch of the first leg may be turned off; when the third switch of the first leg is turned off, the fourth switch of the first leg may be turned on or off. Or the phase difference between the carriers of the third switch and the fourth switch in the same bridge arm can be controlled to be 180 degrees, so that when the third switch of the bridge arm emits waves, the fourth switch of the bridge arm stops emitting waves; when the third switch of a leg stops transmitting, the fourth switch of that leg either transmits or also stops transmitting.
The third switch (or fourth switch) in the plurality of legs may be turned on individually or simultaneously. If the number of the conducted third switches (or fourth switches) is greater than or equal to 2, the duty ratios of the conducted third switches (or fourth switches) may be equal, and the phases of the carriers of the bridge arm switches may be the same or different. For example, if the plurality of bridge arms include 3 bridge arms and the fourth switches in the 3 bridge arms are all turned on, the phase difference between the carriers of the 3 fourth switches may be 120 degrees, so that the 3 fourth switches send out waves in an interlaced manner.
In some possible implementations, the first end of the motor driving module is connected to a positive pole of the power supply, the second end of the motor driving module is connected to a negative pole of the power supply, the first end of the battery module is a positive pole of the battery module, and the second end of the battery module is a negative pole of the battery module. Therefore, the common bus positive connection method can be adopted to realize that the power supply supplies power to the battery module.
In some possible implementations, the first end of the motor driving module is connected to a negative pole of the power supply, the second end of the motor driving module is connected to a positive pole of the power supply, the first end of the battery module is a negative pole of the battery module, and the second end of the battery module is a positive pole of the battery module. Therefore, the common negative line positive connection method can be adopted to realize that the power supply supplies power to the battery module.
In a second aspect, another energy conversion system is disclosed. The energy conversion system comprises a control module, a first switch, a second switch, a motor and a motor driving module; the first end of the motor driving module is connected with the first end of the battery module, the second end of the motor driving module is connected with the second end of the battery module through the first switch, the first end and the second end of the motor driving module are connected with the two ends of the load in parallel, the third end of the motor driving module is connected with the first end of the motor, and the second end of the motor is connected with the second end of the battery module through the second switch. The control module is used for controlling the first switch to be switched off and the second switch to be switched on when the voltage of the load is greater than the voltage of the battery module, and controlling the motor driving module to drive the motor based on the input voltage provided by the battery module so as to charge the load. Thus, the battery module can form a closed loop with the second switch, the motor and the motor driving module, so that the output current of the battery module can flow into the motor through the closed loop. At the moment, the motor is in a charging state, and the motor can form another closed loop with the motor driving module, the battery module, the second switch and the load, so that the battery module can be charged through the motor, the charging current of the load is increased, and the charging efficiency of the load can be improved.
In some possible implementations, the control module is further configured to control the second switch to be turned off, the first switch to be turned on, and the motor driving module to not drive the motor based on the input voltage provided by the battery module to charge the load when the voltage of the load is less than or equal to the voltage of the battery module. So, battery module's output current can directly charge the charge to the load based on not passing through the closed circuit that motor drive module and motor correspond, has improved the charge efficiency of load.
In some possible implementations, the motor driving module includes a plurality of bridge arms connected in parallel, a first parallel connection end of the plurality of bridge arms is a first end of the motor driving module, a second parallel connection end of the plurality of bridge arms is a second end of the motor driving module, and a bridge arm midpoint of one of the plurality of bridge arms is a third end of the motor driving module; the bridge arm comprises a third switch and a fourth switch which are connected in series, and the series connection point of the third switch and the fourth switch of the bridge arm is the bridge arm midpoint of the bridge arm. The motor comprises a plurality of windings with one end connected in parallel, one end of one winding in the plurality of windings is used as a first end of the motor to be connected with the middle point of one bridge arm in the plurality of bridge arms, and the parallel connection end of the plurality of windings is used as a second end of the motor. Therefore, the bridge arm switches in the bridge arms can be controlled to be switched on or switched off, and the corresponding closed loop is formed by the bridge arm switches and the first switch or the second switch, so that the charging efficiency of the load can be improved.
In some possible implementations, the first end of the motor driving module is connected to a positive pole of the load, the second end of the motor driving module is connected to a negative pole of the load, the first end of the battery module is a positive pole of the battery module, and the second end of the battery module is a negative pole of the battery module. Therefore, the common bus positive connection method can be adopted to realize that the battery module charges the load.
In some possible implementations, the first end of the motor driving module is connected to a negative pole of the load, the second end of the motor driving module is connected to a positive pole of the load, the first end of the battery module is a negative pole of the battery module, and the second end of the battery module is a positive pole of the battery module. Therefore, the common negative line positive connection method can be adopted to realize that the battery module charges the load.
In a third aspect, the present application provides a power system comprising the energy conversion system described in the first or second aspect and a battery module.
In a fourth aspect, the present embodiments provide an electric vehicle including the power system described in the third aspect. The electric vehicle may include, but is not limited to, an electric automobile, an electric amusement device, an electric train, an electric bicycle, a golf cart, or other electric vehicles, and may be determined according to practical application scenarios, which are not limited herein.
It should be understood that the implementations and advantages of the various aspects described above in this application are mutually referenced.
Drawings
The drawings used in the embodiments of the present application are described below.
Fig. 1 and fig. 2 are schematic views of an application scenario of an energy conversion system provided in the present application, respectively;
fig. 3, 4 and 5 are schematic structural diagrams of the energy conversion system provided by the present application, respectively;
fig. 6 and 7 are waveform diagrams of a carrier of the bridge arm switch provided in the present application;
fig. 8 and 9 are circuit diagrams of the first closed loop provided by the present application, respectively;
fig. 10 and fig. 11 are circuit diagrams of the second closed loop provided in the present application, respectively;
fig. 12 and 13 are circuit diagrams of a third closed loop provided by the present application, respectively;
fig. 14, 15 and 16 are schematic structural diagrams of another energy conversion system provided by the present application, respectively;
fig. 17 and 18 are circuit diagrams of a fourth closed loop provided by the present application, respectively;
fig. 19 and 20 are circuit diagrams of a fifth closed loop circuit provided by the present application, respectively;
fig. 21 and 22 are circuit diagrams of a sixth closed loop provided by the present application, respectively;
FIG. 23 is a schematic structural diagram of a powertrain system provided herein.
Detailed Description
The energy conversion system provided by the application is suitable for electric vehicles. A battery module such as a high-voltage battery (may also be referred to as a power battery) and a low-voltage battery (may also be referred to as a low-voltage storage battery) and a motor in an electric vehicle, thereby implementing the driving of the battery module, the driving of the motor, or the simultaneous driving of the motor and the charging of the battery module.
The electric vehicle may include, but is not limited to, an electric automobile, an electric amusement device, an electric train, an electric bicycle, a golf cart, or other electric vehicles, and may be determined according to practical application scenarios, which are not limited herein. The energy conversion system provided by the application can be adapted to different application scenes, such as an electric vehicle application scene and an electric amusement device application scene, and the application scene of the electric vehicle is taken as an example for description.
The electric vehicle usually supports the functions of slow charging and quick charging, the quick charging power module is arranged in an external charging pile, and large current is output to quickly charge the battery module. The slow charging power module (e.g., an On Board Charger (OBC)) is disposed inside, the power is generally within 10kW, the commercial power 220V is used as an input, and a current of tens of amperes is output to slow charge the battery module, and the charging time is generally within 10 hours.
The power supply equipment is equipment for providing power supply, and the charging equipment is a charging object of the power supply equipment. The charging method is suitable for a scene that a power supply charges a battery module in an electric vehicle, namely, the power supply equipment is the power supply, and the charging equipment is the battery module. The charging method provided by the application can also be suitable for a scene that the battery module charges the load, namely, the power supply equipment is the battery module, and the charging equipment is the load. This charging method can be understood as a discharging method of the battery module.
In some possible implementations, the power supply may be a direct current provided by a charging pile, and the output specification may include 200-500v, 200-750V and above. Or may be a dc power supply for other electric vehicle outputs; or the direct current can be output after the single-phase and three-phase alternating current charging piles are rectified; or may be electrical energy generated by a fuel cell; or the range extender can be in a power supply form such as a power supply form that an engine rotates to drive a generator to generate power, direct current is rectified by a generator controller, and the like. The power supply may comprise an ac power source. And under the condition that the power supply is an alternating current power supply, a conversion circuit is arranged between the alternating current power supply and the battery module and is used for converting alternating current into direct current.
For example, a power supply is taken as a dc power supply, please refer to fig. 1, and fig. 1 is a schematic view of an application scenario of the energy conversion system provided in the present application. In an application scenario of an electric vehicle, as shown in fig. 1, the electric vehicle may include a battery module and an energy conversion system. The motor in the energy conversion system may be understood as a motor in an electric vehicle (such as an air conditioner compressor motor). When the battery module needs to be charged, the energy conversion system can provide direct current electric energy for the battery module so as to charge the battery module. Optionally, after the high-voltage battery in the battery module is charged, the high-voltage battery may provide direct-current electric energy for a driving motor for driving in the electric vehicle, and the driving motor may convert the direct-current electric energy provided by the high-voltage battery into mechanical energy to drive the electric vehicle to drive. When the motor needs to be driven, other functional modules in the energy conversion system can provide alternating current electric energy for the motor to drive the motor to work, and at the moment, the air-conditioning refrigeration system in the electric automobile can work normally. Optionally, the energy conversion system can drive the motor and charge the battery module, so that the battery module is charged while the air-conditioning refrigeration system works, different requirements of the electric automobile are met, the structural layout of the electric automobile is simplified, the cost is low, the size is small, the integration level is high, and the applicability is stronger.
As shown in fig. 1, when an electric vehicle is charged, the electric vehicle can be generally charged through a charging pile. The charging pile can comprise a power supply circuit and a charging gun; one end of the power supply circuit is connected with a power frequency power grid, and the other end of the power supply circuit is connected with the charging gun through a cable. At present, it is mostly direct current to fill electric pile, and power supply circuit can be direct current with the alternating current conversion that power frequency electric wire netting provided. For example, operating personnel can insert the rifle that charges into electric automobile's charging socket, makes the rifle that charges realize being connected with the battery module in the electric automobile, and the power supply circuit who fills electric pile and then can charge for battery module through the rifle that charges.
Wherein, fill electric pile's output voltage, can understand as the mains voltage that electric automobile received. Under the direct current scene of filling soon, the mains voltage that electric automobile received is located battery module's charging voltage within range, and battery module can directly use the output voltage who fills electric pile to accomplish and charge.
In some possible implementations, the load may be any dc electric device, such as an air conditioner, a mobile phone, a computer, an electric water heater, an electric kettle, and other electric appliances installed or placed in a vehicle, and may even be a movable electric appliance such as an electric vehicle. In the following, a computer is taken as a load, and another application scenario of the energy conversion system is exemplified, and in the application scenario of an electric vehicle, as shown in fig. 2, the electric vehicle may charge the computer. The electric automobile can comprise an energy conversion system and a battery module; one end of the energy conversion system is connected with the battery module, and the other end of the energy conversion system can be connected with the computer through a charging wire, so that the computer can be charged by input voltage (direct current) provided by the battery module.
The application does not limit the types of the battery module, the power supply and the load, and does not limit the number of the devices. Hereinafter, a charging device and a power supply device are exemplified. The battery module may be a single battery or a battery pack including, but not limited to, a high voltage battery and a low voltage battery. The high voltage battery herein may refer to a power source for providing a power source for an electric vehicle, and may include, but is not limited to, a ternary lithium battery, a lithium iron phosphate battery, and other high voltage batteries.
The voltage of the power supply device or the charging device in the present application may be an upper voltage limit supported by the device. For example, if the voltage range of the charging pile is 200-500V, the voltage of the charging pile may be 500V. If the voltage range of the charging pile is 200V-750V, the voltage of the charging pile can be 750V. If the upper limit of the voltage supported by the battery module is 400V, the voltage of the battery module may be 400V. If the upper limit of the voltage supported by the battery module is 600V, the voltage of the battery module may be 600V.
When the voltage of the power supply device is greater than the voltage of the charging device, the charging may be performed by the power supply device adjusting its voltage to be close to or equal to the voltage of the charging device. However, such a charging manner is limited by the current capability of the output of the power supply device, that is, the output current of the power supply device is less than or equal to the maximum value, resulting in low charging efficiency. For example, when the upper limit of the voltage of the battery module in the vehicle is 400V, the voltage range of the charging pile is 200V to 750V, and the maximum value of the output current of the charging pile is 250A, the charging power may be 350V/250A at the maximum considering that the large current charging cannot be performed when the battery is fully charged.
Based on this, this application provides an energy conversion system and driving system, through control energy conversion system's switch or switch on to and motor drive module, can form corresponding closed circuit, charge or discharge the battery module, improved the charging or discharge power, can improve the charge efficiency of battery charging outfit.
The energy conversion system, the power system and the working principle thereof provided by the present application will be exemplified with reference to fig. 3 to 23.
First, a power supply device is taken as a power supply source, and a charging device is taken as a battery module for illustration, that is, a charging scene of the battery module. Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy conversion system provided in the present application. The energy conversion system 1 comprises a control module 11 and a first switch K 1 A second switch K 2 A motor drive module 12 and a motor 13. Wherein, the first end of the motor driving module 12 is connected to the first end of the battery module, and the second end of the motor driving module 12 passes through the first switch K 1 The second end of the battery module is connected, the first end and the second end of the motor driving module 12 are connected in parallel with the two ends of the power supply, the third end of the motor driving module 12 is connected with the first end of the motor 13, and the second end of the motor 13 passes through the second switch K 2 The second end of the battery module is connected.
In some possible embodiments, the control module 11 may include, but is not limited to, a control board, a control chip, or a controller. Illustratively, the control module 11 may include a Battery Management System (BMS), a Micro Control Unit (MCU), a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and the like.
In the embodiment of the present application, the control module 11 is configured to control the first switch K when the voltage of the power supply is greater than the voltage of the battery module 1 A second switch K 2 And switches on and controls the motor driving module 12 to drive the motor 13 based on the input voltage provided by the power supply to charge the battery module.
It will be appreciated that if the first switch K is opened 1 And turn on the second switch K 2 The power supply can be connected with the battery module and the second switch K 2 The motor 13 and the motor drive module 12 form a closed circuit, so that the input current of the power supply can flow into the circuit through the closed circuitA machine 13 and a battery module. At this time, the motor 13 is in a charging state, and the motor 13 may be connected with the motor driving module 12, the battery module and the second switch K 2 Another closed loop is formed so that the battery module can be charged through the motor 13, the charging current of the battery module is increased, and the charging efficiency of the battery module can be improved.
In some possible embodiments, the control module 11 is further configured to control the second switch K when the voltage of the power supply is less than or equal to the voltage of the battery module 2 Turn-off, first switch K 1 And is turned on and controls the motor driving module 12 not to drive the motor 13 based on the input voltage supplied from the power supply source to charge the battery module.
It will be appreciated that if the second switch K is opened 2 And turn on the first switch K 1 And then the output current of the power supply may not pass through the motor driving module 12 and the motor 13, and is connected with the battery module to form a closed loop, so that the output current of the power supply may directly charge the battery module based on the closed circuit that does not pass through the motor driving module and the motor. In this way, the first switch K is controlled by the magnitude relation between the voltage of the power supply and the voltage of the battery module 1 And a second switch K 2 The motor driving module 12 is turned off or on and is controlled to form a corresponding closed loop, so that the charging efficiency of the battery module can be improved.
The motor drive module 12 may include multiple legs connected in parallel. It should be noted that the specific circuit of the motor driving module 12 may be determined according to the actual application scenario, and reference may be made to the related structures exemplarily shown in fig. 4 to fig. 22, which is not limited herein.
The motor 13 may be a motor in an electric vehicle, for example, a driving motor for a traveling vehicle, an air conditioner compressor motor, or other motor. The motor 13 includes, but is not limited to, a three-phase motor and a six-phase motor, and the specific type of the motor 13 may be determined according to the actual application scenario and is not limited herein. For example, when the motor 13 is a three-phase motor, the multi-phase winding may be a three-phase winding; where the motor 13 is a six-phase motor, the multi-phase winding may be a six-phase winding. For convenience of description, the motor 13 will be described as a three-phase motor, and details are not described below.
Referring to fig. 4 and 5 together, fig. 4 and 5 are schematic structural diagrams of an energy conversion system provided in the present application, respectively. As shown in fig. 4 and 5, the energy conversion system 1 includes a control module 11, a first switch K 1 A second switch K 2 A motor drive module 12 and a motor 13. Wherein, the control module 11 and the first switch K 1 A second switch K 2 The connection relationship among the motor driving module 12, the motor 13, the battery module and the power supply source can be referred to the description of fig. 3, and will not be described herein again.
The motor driving module 12 may include a plurality of parallel-connected bridge arms, and each of the plurality of bridge arms may include a third switch and a fourth switch connected in series. For example, fig. 4 and 5 illustrate a three-phase leg, the third switch Q 11 And a fourth switch Q 12 Form a first bridge arm and a third switch Q 21 And a fourth switch Q 22 Form a second bridge arm and a third switch Q 31 And a fourth switch Q 32 To form a third leg.
In some possible implementations, the switches corresponding to the third switch and the fourth switch in each leg may be referred to as leg switches. The bridge arm switch may be a metal-oxide-semiconductor field-effect transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT) made of silicon semiconductor material (silicon, si), silicon carbide (SiC) of third generation wide bandgap semiconductor material, or gallium nitride (GaN), or diamond (diamond), or zinc oxide (ZnO), or other materials, and is not limited herein. For example, the third switch Q 11 And a fourth switch Q 12 Is an IGBT or a MOSFET. The specific circuit topology of the multiple bridge arms in the motor driving module 12 may be determined according to an actual application scenario, for example, a two-level topology or a multi-level topology, which is not limited herein.
It should be noted that the third switch and the fourth switch in the same bridge arm may be in an off state at the same timeBut not both simultaneously in the on state. That is, when the third switch of the bridge arm is in the on state, the fourth switch of the bridge arm may be in the off state. Or the third switch in the same bridge arm and the fourth switch of the bridge arm are in a complementary wave-sending relationship. For example, in the third switch Q 11 When turned on, the fourth switch Q can be turned off 12 (ii) a When the third switch of the bridge arm is turned off, the fourth switch of the bridge arm can be turned on or off. Or the phase difference between the carriers of the third switch and the fourth switch in the same bridge arm can be controlled to be 180 degrees, so that the third switch Q of the bridge arm 11 When the wave is generated, the fourth switch of the bridge arm stops generating the wave; when the third switch of a leg stops transmitting, the fourth switch of that leg either transmits or also stops transmitting.
The third switch (or fourth switch) in the plurality of legs may be turned on individually or simultaneously. If the number of the conducted third switches (or fourth switches) is greater than or equal to 2, the duty ratios of the conducted third switches (or fourth switches) may be equal, and the phases of the carriers of the bridge arm switches may be the same or different. For example, if the motor driving module 12 includes 3 bridge arms and the fourth switches in the 3 bridge arms are all turned on, the phase difference between the carriers of the 3 fourth switches may be 120 degrees, so that the 3 fourth switches send waves in a staggered manner.
For example, referring to fig. 6 and fig. 7, fig. 6 and fig. 7 are waveform diagrams of a carrier of the bridge arm switch provided in the present application, respectively. As shown in fig. 6, arm switch Q 1 And bridge arm switch Q 2 The wave is sent by the same phase and the same duty ratio. As shown in fig. 7, arm switch Q 1 And bridge arm switch Q 2 The same duty cycle is used for wave-sending through the staggered phases.
In some possible embodiments, the parallel connection end of one end of the third switch of each of the plurality of legs may be referred to as a first parallel connection end of the plurality of legs, which may be a first end of the motor drive module 12. The parallel connection section of one end of the fourth switch of each of the plurality of bridge arms mayA second parallel connection section, referred to as a plurality of legs, which may be a second end of the motor drive module 12. The series connection point of the third switch and the fourth switch in any leg may be referred to as the leg midpoint of that leg. For example, the third switch Q 11 And a fourth switch Q 12 The series connection point of (A) is the middle point of the bridge arm of the first bridge arm, and the third switch Q 21 And a fourth switch Q 22 The series connection point of (A) is the middle point of the bridge arm of the second bridge arm, and a third switch Q 31 And a fourth switch Q 32 The series connection point of (a) is the middle point of the bridge arm of the third bridge arm. The bridge arm midpoint of one of the plurality of bridge arms may be a third end of the motor drive module 12.
As shown in fig. 4 and 5, the motor 13 may include a plurality of windings, and one end of one of the plurality of windings is connected to the bridge arm midpoint of one of the plurality of bridge arms as a first end of the motor 13. For example, the midpoint of the first leg is connected to the winding N of the motor 13 1 The middle point of the bridge arm of the second bridge arm is connected with a winding N of the motor 13 2 And the middle point of the bridge arm of the third bridge arm is connected with a winding N3 of the motor 13. The other end of each winding can be referred to as a parallel connection of the windings, which serves as a second end of the electric machine 13, via a second switch K 2 The second end of the battery module is connected.
Fig. 4 adopts a common bus bar positive connection method, a first end (a first parallel connection end of a plurality of bridge arms) of the motor drive module 12 is connected with a positive electrode of the power supply and a positive electrode (a first end) of the battery module, and a second end (a second parallel connection end of a plurality of bridge arms) of the motor drive module 12 is connected with a first switch K 1 And the negative pole (the second end) of the battery module is connected, and the negative pole of the power supply is also connected. The third switch in the leg is the upper tube of the leg relative to the fourth switch, and the fourth switch in the leg is the lower tube of the leg relative to the third switch.
Fig. 5 shows a common negative line positive connection method, in which the first end of the motor driving module 12 (the first parallel connection end of the plurality of bridge arms) supplies the negative pole of the power supply and the negative pole of the battery module (the first end), and the second end of the motor driving module 12 (the second parallel connection end of the plurality of bridge arms) passes through the first switch K 1 Connecting batteryThe positive pole (second end) of the module, and also connect the positive pole of the power supply. The third switch in the leg is a lower tube of the leg relative to the fourth switch and the fourth switch in the leg is an upper tube of the leg relative to the third switch.
In some possible embodiments, the energy conversion system 1 may further include a first inductor, a first capacitor, a second capacitor, a fifth switch, etc., which are not shown, and are not limited herein.
Wherein, the first inductor can be arranged on the second switch K 2 And the motor 13. For example, one end of the first inductor is connected to the second switch K 2 The other end of the first inductor is connected to the parallel connection terminals of the plurality of windings in the motor 13. It can be understood that after the first inductor is added, the resistance value of the winding in the motor 13 can be increased, and the charging power can be further improved, which is beneficial to further improving the charging efficiency.
The first capacitor is connected in parallel at two ends of the battery module, the second capacitor is connected in parallel at two ends of the power supply, and the electric quantity of the first capacitor and the electric quantity of the second capacitor are respectively provided by the equipment at the two ends. The fifth switch may be provided at the negative electrode terminal of the power supply and the second parallel connection terminals of the plurality of bridge arms, and the like. The number of switches arranged in the energy conversion system is not limited, and the specific switch arrangement can be set according to the actual needs of the power supply circuit. The above-mentioned switches may be embodied as contactors or relays, etc. In addition, the placement position of the switch is not limited, and the electric connection relation disclosed by the application can be realized.
Referring to fig. 8 and 9 together, fig. 8 and 9 are circuit diagrams of the first closed loop provided in the present application, respectively. The circuit connection relationship of fig. 8 may refer to the description of fig. 4, and the circuit connection relationship of fig. 9 may refer to the description of fig. 5. In fig. 8 and 9, to turn on the fourth switch Q of the first leg 12 For example, in practice, at least one fourth switch of the plurality of bridge arms may be controlled as a conducting bridge arm switch, i.e. the fourth switch Q 12 And a fourth switch Q 22 And a fourth switch Q 32 At least one of (a). That is, the fourth switch of one of the plurality of legs may be employed to independently fire wavesReferring to fig. 6 and 7, the fourth switches of two bridge arms or the fourth switches of multiple bridge arms can be adopted for synchronous wave sending or staggered wave sending.
The present application is directed to the fourth switch Q being turned on 12 Third switch Q connected in series 11 The state of (2) is not limited. In some possible embodiments, if the fourth switch Q is turned on 12 Is conducted to control the fourth switch Q 12 Third switch Q in series 11 Turn off, or control, the fourth switch Q 12 And a third switch Q 11 Complementary hair wave to realize another closed loop.
It can be understood that the first switch K is controlled when the voltage of the power supply is greater than the voltage of the battery module 1 A second switch K 2 On and controls the motor drive module 12 (at least a fourth switch is on, e.g. fourth switch Q) 12 ) So that the first switch K 1 Is in an off state and the second switch K 2 And a fourth switch Q 12 Is in a conducting state. The power supply can be connected with the battery module and the second switch K 2 And a fourth switch Q connected to the motor 13 12 Connected winding N 1 And the fourth switch Q 12 And the power supply forms a first closed loop. At this time, winding N 1 Corresponding to an inductor, in a charged state. And winding N 1 May also be connected to a third switch Q 11 Battery module and second switch K 2 Forming a second closed loop. The circuit diagram of the second closed loop may refer to fig. 10 and 11, the circuit connection relationship of fig. 10 may refer to the description of fig. 4, and the circuit connection relationship of fig. 11 may refer to the description of fig. 5. And fig. 10 and 11 show the third switch Q of the first leg 11 As exemplified by the device in the second closed loop. Therefore, the power supply can also perform voltage reduction charging on the battery module through the motor 13, the charging current of the battery module is increased, the charging power of the power supply is improved, and the charging efficiency of the battery module can be improved.
In some possible embodiments, please refer to fig. 12 and 13 together, and fig. 12 and 13 are circuit diagrams of the third closed loop provided in the present application, respectively. Circuit of fig. 12The connection relation may refer to the description of fig. 4, and the circuit connection relation of fig. 13 may refer to the description of fig. 5. As shown in fig. 12 and 13, when the voltage of the power supply is less than or equal to the voltage of the battery module, the second switch K may be controlled 2 The motor drive module 12 is switched off and controlled (bridge arm switch off) and the first switch K is controlled 1 Is turned on to make the second switch K 2 And the bridge arm switches of each bridge arm are all in an off state, and the first switch K 1 Is in a conducting state. The output current of the power supply can pass through the third closed loop and is not connected with the battery module through the motor driving module 12 and the motor 13, so that the power supply can directly charge the battery module. Thus, the first switch K is controlled by the magnitude relationship between the voltage of the power supply and the voltage of the battery module 1 And a second switch K 2 And the bridge arm switch is controlled to be switched on or off to form a corresponding closed loop, so that the charging efficiency of the battery module can be improved.
Then, the power supply device is taken as a battery module, and the charging device is taken as a load for illustration, that is, a discharging scene of the battery module. Referring to fig. 14, fig. 14 is another schematic structural diagram of the energy conversion system provided in the present application. As shown in fig. 14 and 15, the energy conversion system 1 may include a control module 11, a first switch K 1 A second switch K 2 A motor drive module 12 and a motor 13. Wherein, the first end of the motor driving module 12 is connected to the first end of the battery module, and the second end of the motor driving module 12 passes through the first switch K 1 The second end of the battery module is connected, the first end and the second end of the motor driving module 12 are connected in parallel with the two ends of the load, the third end of the motor driving module 12 is connected with the first end of the motor 13, and the second end of the motor 13 passes through the second switch K 2 The second end of the battery module is connected. Control module 11, first switch K 1 A second switch K 2 The types of the motor driving module 12, the motor 13, the battery module and the load can be referred to the foregoing or the following, and are not described herein again.
In some possible implementations, the control module 11 is configured to control the first switch K when the voltage of the load is greater than the voltage of the battery module 1 A second switch K 2 And turns on and controls the motor driving module 12 to drive the motor 13 based on the input voltage provided from the battery module to charge the load.
It will be appreciated that if the first switch K is opened 1 And turn on the second switch K 2 Then the battery module can be connected with a second switch K 2 The motor 13 and the motor driving module 12 form a closed loop, so that the output current of the battery module can flow into the motor 13 through the closed loop. At this time, the motor 13 is in a charging state, and the motor 13 may be connected with the motor driving module 12, the battery module, and the second switch K 2 And the load form another closed loop, so that the load can be charged through the motor 13, the discharge current of the battery module is increased, and the charging efficiency of the load can be improved.
In some possible embodiments, the control module 11 is further configured to control the second switch K when the voltage of the load is less than or equal to the voltage of the battery module 2 A first switch K for switching off 1 And is turned on to control the motor driving module 12 not to drive the motor 13 based on the input voltage provided from the battery module to charge the load.
It will be appreciated that if the second switch K is opened 2 And turn on the first switch K 1 And the motor driving module 12 is controlled not to drive the motor 13, the output current of the battery module can be directly charged to the load based on a closed circuit which does not pass through the motor driving module and the motor, so that the charging efficiency of the load is improved. Thus, the first switch K is controlled by the magnitude relationship between the voltage of the load and the voltage of the battery module 1 And a second switch K 2 And the motor driving module 12 is turned off or on and is controlled to form a corresponding closed loop, so that the discharging efficiency of the battery module and the charging efficiency of the load can be improved.
Motor drive module 12, motor 13 and first switch K 1 A second switch K 2 The connection relationship between the battery modules can be described with reference to fig. 4 and 5, the connection relationship between the motor driving module 12 and the motor 13, and the load can be also referred to fig. 15 and 16, and fig. 15 and 16 are respectively another node of the energy conversion system provided by the present applicationSchematic diagram. In fig. 15, a common bus bar positive connection method is adopted, a first end (a first parallel connection end of a plurality of bridge arms) of the motor drive module 12 is connected with a positive electrode of the battery module and a positive electrode (a first end) of the load, and a second end (a second parallel connection end of a plurality of bridge arms) of the motor drive module 12 is connected with a first switch K 1 The negative pole (second end) of the battery module is connected, and also the negative pole of the load is connected. The third switch in the leg is the upper tube of the leg relative to the fourth switch, and the fourth switch in the leg is the lower tube of the leg relative to the third switch.
Fig. 16 adopts a common negative line positive connection method, the first end (the first parallel connection end of the plurality of bridge arms) of the motor drive module 12 is connected with the negative electrode of the battery module and the negative electrode (the first end) of the load, and the second end (the second parallel connection end of the plurality of bridge arms) of the motor drive module 12 is connected with the negative electrode of the load through a first switch K 1 The positive pole of the battery module is connected and the positive pole of the load is also connected. The third switch in the leg is a lower tube of the leg relative to the fourth switch and the fourth switch in the leg is an upper tube of the leg relative to the third switch.
In some possible embodiments, the control module 11 is configured to control the first switch K when the voltage of the load is greater than the voltage of the battery module 1 A second switch K 2 And turns on and controls the motor driving module 12 to drive the motor based on the input voltage provided from the battery module to charge the load.
Referring to fig. 17 and 18 together, fig. 17 and 18 are circuit diagrams of a fourth closed loop provided in the present application, respectively. The circuit connection relationship of fig. 17 can be described with reference to fig. 15, and the circuit connection relationship of fig. 18 can be described with reference to fig. 16. In fig. 17 and 18, third switch Q of the first leg is used 11 Conduction is exemplified. In practice, at least one third switch of the plurality of legs may be controlled as a conducting leg switch, i.e. the third switch Q 11 And a third switch Q 21 And a third switch Q 31 At least one of (a). That is, the third switch of one of the plurality of arms may be used to transmit the wave alone, or the third switches of two arms or the third switches of the plurality of arms may be used to transmit the wave synchronously with reference to fig. 6 and 7Wave generation is staggered.
For the third switch Q that is turned on 11 Fourth switch Q connected in series 12 The state of (2) is not limited. In some possible embodiments, if the third switch Q 11 Is conducted to control the third switch Q 11 Fourth switch Q connected in series 12 Turn off, or control, the fourth switch Q 12 And a third switch Q 11 Complementary wave generation to realize another closed loop.
It can be understood that the first switch K is controlled when the voltage of the load is greater than the voltage of the battery module 1 A second switch K 2 Conducting and controlling the motor drive module 12 (at least one third switch conducting, e.g. third switch Q) 11 ) So that the first switch K 1 Is in an off state and the second switch K 2 And a third switch Q 11 Is in a conducting state. Thus, the battery module can be connected with the second switch K 2 And a third switch Q in the motor 13 and conducting 11 Connected winding N 1 And a third switch Q 11 A fourth closed loop is formed. At this time, winding N 1 Corresponding to an inductor, in a charging state. And the battery module can also be connected with a second switch K 2 Winding N 1 And a fourth switch Q 12 And the load forms a fifth closed loop. The circuit diagram of this fifth closed loop can be seen in fig. 19 and 20. The circuit connection relationship of fig. 19 may refer to the description of fig. 15, and the circuit connection relationship of fig. 20 may refer to the description of fig. 16. Like this, motor 13 charges through the fifth closed circuit to the load steps up, has increased the charging current of load, has improved the charging power of load, can improve the charge efficiency of load.
In some possible embodiments, please refer to fig. 21 and fig. 22 together, and fig. 21 and fig. 22 are circuit diagrams of the sixth closed loop provided in the present application, respectively. The circuit connection relationship of fig. 21 can be described with reference to fig. 15, and the circuit connection relationship of fig. 22 can be described with reference to fig. 16. As shown in fig. 21 and 22, when the voltage of the load is less than or equal to the voltage of the battery module, the second switch K may be controlled 2 Shut down and control of the motor drive module 12 (bridge arm switch off)) And controls the first switch K 1 Is turned on to make the second switch K 2 And the bridge arm switches of all bridge arms are in an off state, and the first switch K 1 Is in a conducting state. The output current of the battery module may pass through the sixth closed loop without being connected to the load through the motor driving module 12 and the motor 13, so that the battery module may be directly charged to the load. Thus, the first switch K is controlled by the magnitude relationship between the voltage of the load and the voltage of the battery module 1 And a second switch K 2 And the bridge arm switch is controlled to be switched off or switched on to form a corresponding closed loop, so that the charging efficiency of the load can be improved.
Further, please refer to fig. 23, fig. 23 is a schematic structural diagram of the power system provided in the present application. The power system provided by the present application is suitable for the above electric vehicle, and the specific structure of the power system is shown in fig. 23, and the power system includes a battery module and an energy conversion system (such as the energy conversion system shown in fig. 2 to 22), and since the energy conversion system can drive the motor and charge the battery module at the same time, or drive the motor alone, or charge the battery module alone in a single-phase or three-phase manner, the working efficiency and flexibility of the power system can be improved, the structure is simpler and has high integration level, and the cost is low; in addition, the energy conversion system can integrate the motor and the vehicle-mounted charger without using a high-voltage distribution box, so that the number of high-voltage components used in the power system is reduced, the cost is lower, and the applicability is higher.
Through implementing this application, if energy conversion system locates between battery module and the power supply, through the big or small relation between the voltage of power supply and the voltage of battery module, the turn-off of first switch and the second switch among the control energy conversion system or switch on to and control motor drive module drive or not drive the motor, form corresponding closed circuit, can improve battery module's charge efficiency. When the energy conversion system is arranged between the battery module and the load, the first switch and the second switch in the energy conversion system are controlled to be switched off or switched on through the magnitude relation between the voltage of the load and the voltage of the battery module, and the motor driving module is controlled to drive or not drive the motor to form a corresponding closed loop, so that the charging efficiency of the load can be improved.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program code, such as a removable memory device, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. An energy conversion system is characterized by comprising a control module, a first switch, a second switch, a motor and a motor driving module; wherein,
the first end of the motor driving module is connected with the first end of the battery module, the second end of the motor driving module is connected with the second end of the battery module through the first switch, the first end and the second end of the motor driving module are connected with the two ends of the power supply in parallel, the third end of the motor driving module is connected with the first end of the motor, and the second end of the motor is connected with the second end of the battery module through the second switch;
and the control module is used for controlling the first switch to be switched off and the second switch to be switched on when the voltage of the power supply is greater than the voltage of the battery module, and controlling the motor driving module to drive the motor based on the input voltage provided by the power supply so as to charge the battery module.
2. The energy conversion system of claim 1, wherein the control module is further configured to control the second switch to be turned off and the first switch to be turned on when the voltage of the power supply is less than or equal to the voltage of the battery module, and control the motor driving module to not drive the motor based on the input voltage provided by the power supply to charge the battery module.
3. The energy conversion system according to claim 1 or 2, wherein the motor drive module comprises a plurality of legs connected in parallel, a first parallel connection end of the plurality of legs is a first end of the motor drive module, a second parallel connection end of the plurality of legs is a second end of the motor drive module, and a bridge leg midpoint of one of the plurality of legs is a third end of the motor drive module; the bridge arm comprises a third switch and a fourth switch which are connected in series, and the series connection point of the third switch and the fourth switch of the bridge arm is the bridge arm midpoint of the bridge arm;
the motor comprises a plurality of windings with one end connected in parallel, one end of one winding in the plurality of windings is used as a first end of the motor to be connected with the middle point of one bridge arm in the plurality of bridge arms, and the parallel connection ends of the plurality of windings are used as the second end of the motor.
4. The energy conversion system according to any one of claims 1 to 3, wherein a first end of the motor drive module is connected to a positive pole of the power supply, a second end of the motor drive module is connected to a negative pole of the power supply, a first end of the battery module is a positive pole of the battery module, and a second end of the battery module is a negative pole of the battery module.
5. The energy conversion system according to any one of claims 1 to 3, wherein a first end of the motor drive module is connected to a negative pole of the power supply, a second end of the motor drive module is connected to a positive pole of the power supply, a first end of the battery module is a negative pole of the battery module, and a second end of the battery module is a positive pole of the battery module.
6. An energy conversion system, characterized in that the energy conversion system comprises a control module, a first switch, a second switch, a motor and a motor driving module; wherein,
the first end of the motor driving module is connected with the first end of the battery module, the second end of the motor driving module is connected with the second end of the battery module through the first switch, the first end and the second end of the motor driving module are connected with the two ends of the load in parallel, the third end of the motor driving module is connected with the first end of the motor, and the second end of the motor is connected with the second end of the battery module through the second switch;
the control module is used for controlling the first switch to be switched off and the second switch to be switched on when the voltage of the load is greater than the voltage of the battery module, and controlling the motor driving module to drive the motor based on the input voltage provided by the battery module so as to charge the load.
7. The energy conversion system of claim 6, wherein the control module is further configured to control the second switch to be turned off and the first switch to be turned on when the voltage of the load is less than or equal to the voltage of the battery module, and to control the motor driving module to not drive the motor based on the input voltage provided by the battery module to charge the load.
8. The energy conversion system according to claim 6 or 7, wherein the motor drive module comprises a plurality of bridge arms connected in parallel, a first parallel connection end of the plurality of bridge arms is a first end of the motor drive module, a second parallel connection end of the plurality of bridge arms is a second end of the motor drive module, and a bridge arm midpoint of one of the plurality of bridge arms is a third end of the motor drive module; the bridge arm comprises a third switch and a fourth switch which are connected in series, and the series connection point of the third switch and the fourth switch of the bridge arm is the bridge arm midpoint of the bridge arm;
the motor comprises a plurality of windings with one end connected in parallel, one end of one winding in the plurality of windings is used as a first end of the motor to be connected with the middle point of one bridge arm in the plurality of bridge arms, and the parallel connection ends of the plurality of windings are used as the second end of the motor.
9. The energy conversion system according to any one of claims 6 to 8, wherein a first end of the motor drive module is connected to a positive pole of the load, a second end of the motor drive module is connected to a negative pole of the load, a first end of the battery module is a positive pole of the battery module, and a second end of the battery module is a negative pole of the battery module.
10. The energy conversion system according to any one of claims 6 to 8, wherein a first end of the motor drive module is connected to a negative pole of the load, a second end of the motor drive module is connected to a positive pole of the load, a first end of the battery module is a negative pole of the battery module, and a second end of the battery module is a positive pole of the battery module.
11. A power system comprising an energy conversion system according to any one of claims 1-10 and a battery module.
CN202210741419.7A 2022-06-28 2022-06-28 Energy conversion system and power system Pending CN115149606A (en)

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Application Number Priority Date Filing Date Title
CN202210741419.7A CN115149606A (en) 2022-06-28 2022-06-28 Energy conversion system and power system

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