Motor controller, motor control system and electric vehicle

Abstract

The utility model provides a motor controller, a motor control system and an electric vehicle. The motor controller comprises a switch control circuit and a driving circuit, and when the electric vehicle is in a first working mode, the switch control circuit is used for controlling the driving circuit to output first driving voltage; when the electric vehicle is in a second working mode, the switch control circuit is used for controlling the driving circuit to output second driving voltage; the first driving voltage is equal to the voltage of the power battery, and the second driving voltage is greater than the voltage of the power battery. The driving circuit is controlled to work through the switch control circuit according to different working modes of the electric vehicle, the first driving voltage can be output through inversion, the second driving voltage can also be output through boosting, different voltage requirements are met, and the dynamic property of the electric vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric vehicles, in particular to a motor controller, a motor control system and an electric vehicle. BACKGROUND

[0002] Hybrid electric vehicle (HEV / PHEV) generally refers to a vehicle using both fuel drive and electric drive, and the range extender hybrid electric vehicle is a series plug-in hybrid electric vehicle, which is different from the common parallel hybrid vehicle. The range extender hybrid vehicle is driven by an electric motor, and does not use an internal combustion engine for driving. For the range extender hybrid electric vehicle, the function of the internal combustion engine is to drive the generator to generate electricity, charge the battery, drive the motor or provide power for other electrical equipment such as air conditioning, heating equipment and 12V power supply. The conventional range extender vehicle energy flow is as shown in Figure 1

[0003] In the current electric vehicle, the power battery is usually discharged to drive the motor to control the motor to drive the wheels to rotate. However, in this process, the working voltage of the motor is always consistent with the voltage of the power battery, and cannot be selected according to the highest efficiency point of the motor. As the SOC of the power battery decreases, the voltage of the power battery decreases, and the driving voltage of the motor also decreases, which may narrow the high-efficiency working range of the motor and weaken the economy of the vehicle. CONTENT OF THE INVENTION

[0004] In order to solve the problems in the prior art, the present application provides a motor controller, a motor control system and an electric vehicle, which improves the economy of the electric vehicle.

[0005] In a first aspect, the present application provides a motor controller for controlling the operation of a motor and the output voltage of a power battery. The motor controller comprises a switching control circuit and a driving circuit. In a first working mode, the switching control circuit is configured to control the driving circuit to output a first driving voltage. In a second working mode, the switching control circuit is configured to control the driving circuit to output a second driving voltage. The first driving voltage is equal to the voltage of the power battery to be controlled, and the second driving voltage is greater than the voltage of the power battery to be controlled.

[0006] In an embodiment, the switching control circuit comprises a first switching circuit, a second switching circuit, a first inductor and a first control circuit.

[0007] The first control circuit is configured to control the driving circuit to output the first driving voltage when the first switching circuit is turned on and the second switching circuit is turned off, and to control the driving circuit to convert the voltage of the power battery to be controlled into the second driving voltage when the first switching circuit is turned off and the second switching circuit is turned on.​

[0008] In an embodiment, the motor controller further comprises a second control circuit;

[0009] The second control circuit is configured to control the first switch circuit and the second switch circuit to be turned on / off according to the power of the power battery to be controlled.

[0010] In an embodiment, the second control circuit is configured to control the first switch circuit to be turned on and the second switch circuit to be turned off when the power of the power battery to be controlled is greater than a power threshold; and control the first switch circuit to be turned off and the second switch circuit to be turned on when the power of the power battery to be controlled is less than or equal to the power threshold.

[0011] In an embodiment, each phase line of the motor is provided with a second inductor, and the first inductor is the second inductor of any phase line in the motor.

[0012] In an embodiment, the motor comprises a first motor and a second motor, the drive circuit is electrically connected with the first motor, and the drive circuit is configured to convert a voltage output by the first motor into a first driving voltage.

[0013] The motor controller further comprises a third control circuit configured to control the second motor to work.

[0014] In an embodiment, the drive circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, and a first capacitor.

[0015] A first end of the first switch tube, a first end of the third switch tube, and a first end of the fifth switch tube are electrically connected to form a first input end of the drive circuit, a first end of the second switch tube, a first end of the fourth switch tube, and a first end of the sixth switch tube are electrically connected to form a second input end of the drive circuit, a second end of the first switch tube and a second end of the second switch tube are electrically connected to form a first output end of the drive circuit, a second end of the third switch tube and a second end of the fourth switch tube are electrically connected to form a second output end of the drive circuit, and a second end of the fifth switch tube and a second end of the sixth switch tube are electrically connected to form a third output end of the drive circuit.

[0016] A first end of the first capacitor is electrically connected to the first input end of the drive circuit, and a second end of the first capacitor is electrically connected to the second input end of the drive circuit.

[0017] The first input end of the driving circuit is electrically connected with the second end of the first switch circuit, the second input end of the driving circuit is electrically connected with the negative electrode of the power battery, and the second end of the first inductor is electrically connected with the second end of the first switch tube.

[0018] The first control circuit is configured to control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to work to output a first driving voltage, or control the first switch tube and the second switch tube to work to output a second driving voltage.

[0019] The application further provides an electric motor controller applied to an electric vehicle, wherein the electric vehicle comprises a power battery, and the electric motor controller comprises a switch control circuit and a driving circuit.

[0020] In an embodiment, the switch control circuit comprises a first switch circuit, a second switch circuit, a first inductor and a first control circuit.

[0021] The first control circuit is configured to control the driving circuit to output the first driving voltage when the first switch circuit is turned on and the second switch circuit is turned off, and control the driving circuit to convert the voltage of the power battery into the second driving voltage when the first switch circuit is turned off and the second switch circuit is turned on.

[0022] In an embodiment, the electric motor controller further comprises a second control circuit.

[0023] The second control circuit is configured to control the first switch circuit to be turned on and the second switch circuit to be turned off when the power of the power battery is greater than a power threshold, and control the first switch circuit to be turned off and the second switch circuit to be turned on when the power of the power battery is less than or equal to the power threshold.

[0024] In an embodiment, the electric vehicle further comprises a three-phase motor, and a third inductor is arranged on each phase line of the three-phase motor, and the first inductor is the third inductor arranged on any phase line of the three-phase motor.

[0025] In an embodiment, the electric vehicle further comprises a driving motor, and the electric motor controller further comprises a third control circuit configured to control the driving motor to work.

[0026] In an embodiment, the drive circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube and a first capacitor;

[0027] The first end of the first switch tube, the first end of the third switch tube and the first end of the fifth switch tube are electrically connected to constitute a first input end of the drive circuit, the first end of the second switch tube, the first end of the fourth switch tube and the first end of the sixth switch tube are electrically connected to constitute a second input end of the drive circuit, the second end of the first switch tube and the second end of the second switch tube are electrically connected to constitute a first output end of the drive circuit, the second end of the third switch tube and the second end of the fourth switch tube are electrically connected to constitute a second output end of the drive circuit, and the second end of the fifth switch tube and the second end of the sixth switch tube are electrically connected to constitute a third output end of the drive circuit;

[0028] The first end of the first capacitor is electrically connected to the first input end of the drive circuit, and the second end of the first capacitor is electrically connected to the second input end of the drive circuit;

[0029] The first input end of the drive circuit is electrically connected to the second end of the first switch circuit, the second input end of the drive circuit is electrically connected to the negative electrode of the power battery, and the second end of the first inductor is electrically connected to the second end of the first switch tube;

[0030] The first control circuit is configured to control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to work to output a first drive voltage, or control the first switch tube and the second switch tube to work to output a second drive voltage.

[0031] The application further provides a motor control system, which comprises a first motor, a second motor and the motor controller.

[0032] The motor controller is configured to output the first drive voltage or the second drive voltage to drive the first motor and / or the second motor to work, and the second drive voltage is greater than the first drive voltage.

[0033] In an embodiment, the motor control system comprises an engine, and the first motor is configured to drive the engine to work.

[0034] In an embodiment, the motor control system further comprises a discharging interface.

[0035] The discharging interface is configured to be electrically connected to a powered device, and the discharging interface is configured to output the second drive voltage to the powered device.

[0036] The application also provides a motor control system, which comprises a three-phase motor, a driving motor and the motor controller.

[0037] The motor controller is configured to output a first driving voltage or a second driving voltage; the first driving voltage is configured to drive the three-phase motor to work, and the second driving voltage is configured to drive the driving motor to work; the second driving voltage is greater than the first driving voltage.

[0038] In an embodiment, the motor control system further comprises a discharging interface.

[0039] The discharging interface is configured to be electrically connected with a powered device, and the discharging interface is configured to output the second driving voltage to the powered device.

[0040] The application also provides an electric vehicle, which comprises a power battery and the motor control system.

[0041] The application controls the driving circuit to work according to different working modes through the switching control circuit, so that the first driving voltage equal to the voltage of the power battery can be output, or the second driving voltage can be output by boosting the voltage of the power battery, different voltage requirements are met, and the power of the motor controller is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 An energy flow schematic diagram of an existing technology range-extender vehicle.

[0043] Figure 2 A module structure diagram of the motor controller according to an embodiment of the application.

[0044] Figure 3 A circuit structure diagram of the motor controller according to an embodiment of the application.

[0045] Figure 4 An energy flow schematic diagram of the electric vehicle according to an embodiment of the application.

[0046] Figure 5 An equivalent circuit diagram of the motor controller according to an embodiment of the application in a second discharging path.

[0047] Figure 6 An equivalent circuit diagram of the motor controller according to another embodiment of the application in a second discharging path.

[0048] Figure 7 A structure schematic diagram of the electric vehicle according to an embodiment of the application.

[0049] Explanation of main element symbols:

[0050]

[0051] The following detailed description will further describe the present application with reference to the above mentioned figures. DETAILED DESCRIPTION

[0052] The following description will reference the accompanying drawings so as to provide a thorough understanding of the present application. The drawings provided herein are exemplary of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be both thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like elements throughout.

[0053] With reference to Figure 2 The present application proposes an electric motor controller 100 for controlling an electric motor 200 to work while controlling an output voltage of a power battery 300, the electric motor controller 100 comprising a switch control circuit 110 and a driving circuit 120, when the electric vehicle 10 is in a first working mode, the switch control circuit 110 is configured to control the driving circuit 120 to output a first driving voltage; when the electric vehicle 10 is in a second working mode, the switch control circuit 110 is configured to control the driving circuit 120 to output a second driving voltage; the first driving voltage is equal to the voltage of the power battery 300 to be controlled, and the second driving voltage is greater than the voltage of the power battery 300 to be controlled.

[0054] In the present embodiment, the electric motor controller 100 can be applied to a vehicle, a ship or other transportation tools, or an air conditioner, a sweeping robot or other furniture devices, or an electric scissors, an electric chain saw or other electric tools. Taking the electric motor controller 100 applied to the electric vehicle 10 as an example, in the first working mode, the switch control circuit 110 can control the driving circuit 120 to output a first driving voltage equal to the voltage of the power battery 300. In the second working mode, the switch control circuit 110 can control the driving circuit 120 to output a second driving voltage greater than the voltage of the power battery 300. In this way, the electric vehicle 10 can switch different working modes to make the driving circuit 120 output different driving voltages to meet different power supply requirements.

[0055] With reference to Figure 3 and Figure 4In an embodiment, the electric vehicle 10 can include a power battery 300 and an engine 700, and the motor 200 can include a first motor 210 and a second motor 220. The first motor 210 can convert the mechanical energy output by the engine 700 into electrical energy output. The second motor 220 can be connected to the running system or the steering system of the electric vehicle 10 to control the running or steering of the wheels. The first working mode of the electric vehicle 10 can be a hybrid drive powered by the power battery 300 and the first motor 210 together, and the second working mode can be a pure electric drive powered by the power battery 300.

[0056] In the hybrid drive mode, the switch control circuit 110 controls the drive circuit 120 to perform inversion (DC to AC) to convert the voltage output by the first motor 210 into a first drive voltage output to the second motor 220, while the power battery 300 also supplies power to the second motor 220. At this time, the first drive voltage follows the change of the voltage output by the power battery 300, and if the voltage output by the power battery 300 is relatively high, the first drive voltage is relatively large and can meet the working voltage requirement of the second motor 220; if the voltage output by the power battery 300 decreases, the first drive voltage also decreases, and the first drive voltage cannot meet the working voltage requirement of the second motor 220, in which case the second working mode can be switched to, so that the drive circuit 120 boosts the voltage output by the power battery 300 to meet the working voltage requirement of the second motor 220.

[0057] The second working mode of the electric vehicle 10 can be a power battery 300 power drive. In the pure electric drive mode, the switch control circuit 110 controls the drive circuit 120 to perform voltage boosting to convert the voltage output by the power battery 300 into a second drive voltage output to the second motor 220. At this time, the first motor 210 does not work, and even if the voltage output by the power battery 300 is relatively low, the switch control circuit 110 can control the drive circuit 120 to boost the voltage output by the power battery 300 to output a second drive voltage with a relatively high voltage, which can meet the working voltage requirement of the second motor 220 when the voltage output by the power battery 300 is relatively low, and increase the high-efficiency working interval of the second motor 220.

[0058] In addition, the first working mode and the second working mode of the electric vehicle 10 can also be set according to actual application. For example, the first working mode can also be to supply power to the internal load of the electric vehicle 10, and the second working mode can be to supply power to external equipment.

[0059] The present application controls the drive circuit 120 to work according to different working modes through the switch control circuit 110, which can output a first drive voltage equal to the voltage of the power battery 300, or boost the voltage of the power battery 300 to output a second drive voltage, to meet different voltage requirements and improve the power of the motor controller 100.

[0060] In an embodiment, the switch control circuit 110 comprises a first switch circuit 111, a second switch circuit 112, a first inductor L1, a driving circuit 120 and a first control circuit 113.

[0061] The first end of the first switch circuit 111 is configured to be electrically connected to the positive electrode of the power battery 300. The first end of the second switch circuit 112 is configured to be electrically connected to the positive electrode of the power battery 300. The first end of the first inductor L1 is electrically connected to the second end of the second switch circuit 112. The input end of the driving circuit 120 is electrically connected to the second end of the first switch circuit 111 and the second end of the first inductor L1, respectively. The first control circuit 113 is configured to control the driving circuit 120 to output a first driving voltage when the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, and to convert the voltage of the power battery 300 into a second driving voltage when the first switch circuit 111 is turned off and the second switch circuit 112 is turned on; the size of the first driving voltage is consistent with the size of the voltage of the power battery 300, and the second driving voltage is greater than the voltage of the power battery 300.

[0062] In the embodiment, when the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, the first switch circuit 111 and the driving circuit 120 form a first discharge path. The voltage output by the power battery 300 is output to the driving circuit 120 through the first switch circuit 111, and the driving circuit 120 is controlled by the first control circuit 113 to invert (convert DC to AC) to form a first driving voltage output. At this time, the size of the first driving voltage is consistent with the size of the voltage output by the power battery 300.

[0063] When the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, the second switch circuit 112, the first inductor L1 and the driving circuit 120 form a second discharge path. The voltage output by the power battery 300 is output to the driving circuit 120 through the second switch circuit 112 and the first inductor L1, and the driving circuit 120 is controlled by the first control circuit 113 to boost to form a second driving voltage output. Due to the volt-second characteristic of the first inductor L1, a boost circuit can be formed in cooperation with the driving circuit 120 to realize voltage boosting of the voltage output by the power battery 300. In this way, when the voltage output by the power battery 300 is small, the voltage can be boosted through the second discharge path to meet the voltage requirement of the back end.

[0064] For example, when the first motor 210 and the power battery 300 supply power to the second motor 220 at the same time, the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, and the power battery 300 can supply power to the second motor 220 through the first discharge path. At this time, the first motor 210 also works normally. The first drive voltage changes with the voltage output by the power battery 300. If the voltage output by the power battery 300 is relatively high, the first drive voltage is relatively large, and the working voltage requirement of the second motor 220 can be met. If the voltage output by the power battery 300 decreases, the first drive voltage also decreases, and the working voltage requirement of the second motor 220 cannot be met. In this case, the voltage output by the power battery 300 can be boosted through the second discharge path to meet the working voltage requirement of the second motor 220.

[0065] In the pure electric driving mode, the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, and the power battery 300 can boost the voltage output by the power battery 300 through the second discharge path to supply power to the second motor 220. At this time, the first motor 210 does not work. Even if the voltage output by the power battery 300 is relatively low, the voltage output by the power battery 300 can be boosted through the second discharge path to output a second drive voltage with a relatively high voltage, so that the working voltage requirement of the second motor 220 can be met even when the voltage output by the power battery 300 is relatively low, and the high-efficiency working interval of the second motor 220 is increased.

[0066] The first switch circuit 111 can be implemented by using a relay, a field effect transistor or other devices with switching function, and the second switch circuit 112 can be implemented by using a relay, a field effect transistor or other devices with switching function. The first control circuit 113 can be implemented by using a microprocessor, an FPGA or other chips with control function.

[0067] In an embodiment, the drive circuit 120 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6 and a first capacitor C1.

[0068] The first end of the first switch tube Q1, the first end of the third switch tube Q3 and the first end of the fifth switch tube Q5 are electrically connected to constitute a first input end of the drive circuit 120, the first end of the second switch tube Q2, the first end of the fourth switch tube Q4 and the first end of the sixth switch tube Q6 are electrically connected to constitute a second input end of the drive circuit 120, the second end of the first switch tube Q1 and the second end of the second switch tube Q2 are electrically connected to constitute a first output end of the drive circuit 120, the second end of the third switch tube Q3 and the second end of the fourth switch tube Q4 are electrically connected to constitute a second output end of the drive circuit 120, and the second end of the fifth switch tube Q5 and the second end of the sixth switch tube Q6 are electrically connected to constitute a third output end of the drive circuit 120.

[0069] The first end of the first capacitor C1 is electrically connected to the first input end of the driving circuit 120, and the second end of the first capacitor C1 is electrically connected to the second input end of the driving circuit 120. The first input end of the driving circuit 120 is electrically connected to the second end of the first switch circuit 111, and the second input end of the driving circuit 120 is electrically connected to the negative electrode of the power battery 300. The second end of the first inductor L1 is electrically connected to the second end of the first switch tube Q1.

[0070] The first control circuit 113 is configured to control the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, and the sixth switch tube Q6 to work to output the first driving voltage, or control the first switch tube Q1 and the second switch tube Q2 to work to output the second driving voltage.

[0071] In the embodiment, when the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, the first control circuit 113 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, and the sixth switch tube Q6 to be turned on / off to inverter, and converts the voltage output by the power battery 300 or other input power supply voltage into the first driving voltage, and filters the first driving voltage through the second capacitor C2.

[0072] When the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, the first control circuit 113 controls the first switch tube Q1 and the second switch tube Q2 to be turned on alternately, and cooperates with the first inductor L1 and the first capacitor C1 to boost the voltage output by the power battery 300 into the second driving voltage.

[0073] For example, when the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, the first control circuit 113 can control the first switch tube Q1 and the second switch tube Q2 to work through constant pulse width modulation, and control other switch tubes to be turned off. When the first switch tube Q1 is turned off and the second switch tube Q2 is turned on, the voltage output by the power battery 300 charges the first inductor L1, and the electric energy is converted into magnetic energy and stored in the first inductor L1. The circuit equivalent diagram is as shown in Figure 5 .

[0074] When the first switch tube Q1 is turned on and the second switch tube Q2 is turned off, the first inductor L1 discharges to the first capacitor C1. The circuit equivalent diagram is as shown in Figure 6The voltage across the first capacitor C1 is pumped up due to the energy storage of the first inductor L1. After the voltage across the first capacitor C1 is stabilized, the output second driving voltage can be higher than the voltage of the input power battery 300, realizing the function of voltage boosting. Further, by adjusting the duty cycle of the constant pulse width modulation output by the first control circuit 113, the switching frequency of the first switch and the second switch Q2 can be adjusted, and the voltage boosting multiple of the output second driving voltage can be adjusted:

[0075] D = 1 - V in / V out ;

[0076] wherein D is the duty cycle, V in is the voltage of the input power battery 300, V out is the output second driving voltage, and the voltage boosting multiple is V out / V in .

[0077] In an embodiment, the driving circuit 120 can further include a second capacitor C2. The second capacitor C2 is used to filter the voltage output by the power battery 300.

[0078] The application controls the discharge path of the power battery 300 through the first switch circuit 111 and the second switch circuit 112, and controls the operation of the driving circuit 120 through the first control circuit 113, so that the first driving voltage can be inverter output and the second driving voltage can be boosted output. The application boosts the voltage output by the power battery 300 through the first inductor L1 and the driving circuit 120 to meet the voltage requirement of the subsequent circuit, thereby improving the power of the electric vehicle 10. The application integrates the voltage boosting function on the driving circuit 120, reduces the number of electronic devices used, reduces the cost of the motor controller 100, and also reduces the occupied space of the motor controller 100, thereby improving the economy of the electric vehicle 10.

[0079] In an embodiment, the motor controller 100 further includes a second control circuit 150. The second control circuit 150 is used to control the conduction / disconnection of the first switch circuit 111 and the second switch circuit 112 according to the power of the power battery 300.

[0080] In the embodiment, when the power of the power battery 300 is large, the voltage output by the power battery 300 is also high, and the second control circuit 150 can control the first switch circuit 111 to be turned on and the second switch circuit 112 to be turned off, so that the power battery 300 discharges through the first discharge path. At this time, the first driving voltage can meet the voltage requirement of the subsequent circuit. In the process of continuous discharge of the power battery 300, with the passage of time, the power of the power battery 300 gradually decreases, and the voltage output by the power battery 300 also decreases. When the voltage of the power battery 300 decreases to a value that cannot meet the voltage requirement of the subsequent circuit, the second control circuit 150 can control the first switch circuit 111 to be turned off and the second switch circuit 112 to be turned on, so that the power battery 300 discharges through the second discharge path. The voltage output by the power battery 300 is boosted by the first inductor L1 and the driving circuit 120, forming a second driving voltage to meet the voltage requirement of the subsequent circuit.

[0081] In an embodiment, the second control circuit 150 is configured to control the first switch circuit 111 to be turned on and the second switch circuit 112 to be turned off when the power of the power battery 300 is greater than the power threshold value, and control the first switch circuit 111 to be turned off and the second switch circuit 112 to be turned on when the power of the power battery 300 is less than or equal to the power threshold value.

[0082] In the embodiment, the second control circuit 150 can communicate with the power battery 300 to obtain the power information of the power battery 300. The power threshold value can be set according to the working voltage of the subsequent circuit. For example, when the working voltage of the subsequent circuit is 5V, the power threshold value can be set to the power value corresponding to the voltage of 4.8V of the power battery 300. When the power of the power battery 300 is greater than the power threshold value, it indicates that the power of the power battery 300 is sufficient, and the output voltage is also high, which can meet the voltage requirement of the subsequent circuit. The second control circuit 150 controls the first switch circuit 111 to be turned on and the second switch circuit 112 to be turned off, and the driving circuit 120 is controlled by the first control circuit 113 to invert the voltage output by the power battery 300 into the first driving voltage. When the power of the power battery 300 is less than or equal to the power threshold value, it indicates that the power of the power battery 300 is low and cannot provide a suitable voltage to drive the subsequent circuit to work. At this time, the second control circuit 150 controls the first switch circuit 111 to be turned off and the second switch circuit 112 to be turned on, and the driving circuit 120 is controlled by the first control circuit 113 to boost the voltage output by the power battery 300 to form a second driving voltage to meet the voltage requirement of the subsequent circuit. In addition, by integrating the second control circuit 150 in the motor controller 100, the occupied space of the electric vehicle 10 can be reduced.

[0083] In an embodiment, each phase wire of the motor 200 is provided with a second inductance L2, and the first inductance L1 is the second inductance L2 of any phase wire in the first motor 210.

[0084] In the embodiment, by multiplexing the second inductance L2 of any phase wire in the first motor 210 as the first inductance L1, the number of inductor devices can be further reduced, and the occupied space and cost of the motor controller 100 can be reduced.

[0085] In an embodiment, the motor 200 includes a first motor 210 and a second motor 220, and the driving circuit 120 is electrically connected with the first motor 210. The motor controller 100 further includes a third control circuit 115, and the third control circuit 115 is configured to control the second motor 220 to work.

[0086] For example, the first motor 210 can be a generator, and the second motor 220 can be a driving motor for driving a vehicle to travel. In some devices including dual motors, by integrating the third control circuit 115 in the motor controller 100, the occupied space of the dual motor device can be reduced.

[0087] Referring to Figure 7 , the application further provides a motor controller 100 applied to an electric vehicle 10, the electric vehicle 10 including a power battery 300, and the motor controller 100 including a switch control circuit 110 and a driving circuit 120. The switch control circuit 110 is configured to control the driving circuit 120 to output a first driving voltage when the power of the power battery 300 is greater than an electric quantity threshold value, and to output a second driving voltage when the power of the power battery 300 is less than or equal to the electric quantity threshold value. The first driving voltage is equal in size to the voltage of the power battery 300, and the second driving voltage is greater than the voltage of the power battery 300.

[0088] In the embodiment, the driving circuit 120 can convert the voltage output by the power battery 300 into the first driving voltage or the second driving voltage.

[0089] Under pure electric driving, the switch control circuit 110 controls the driving circuit 120 to convert the voltage output by the power battery 300 into the first driving voltage and output to the driving motor 500. If the voltage output by the power battery 300 is low, the switch control circuit 110 can control the driving circuit 120 to boost the voltage output by the power battery 300, and output the second driving voltage with a higher voltage. The voltage output by the power battery 300 is low, and the working voltage requirement of the driving motor 500 can be met, and the high-efficiency working interval of the driving motor 500 is increased.

[0090] The switch control circuit 110 can obtain the power information of the power battery 300. The power threshold can be set according to the working voltage of the subsequent circuit. For example, when the working voltage of the subsequent circuit is 5V, the power threshold can be set to the power value corresponding to the voltage of 4.8V of the power battery 300.

[0091] The switch control circuit 110 can obtain the power information of the power battery 300. The power threshold can be set according to the working voltage of the subsequent circuit. For example, when the working voltage of the subsequent circuit is 5V, the power threshold can be set to the power value corresponding to the voltage of 4.8V of the power battery 300.

[0092] In an embodiment, the switch control circuit 110 includes a first switch circuit 111, a second switch circuit 112, a first inductor L1 and a first control circuit 113. The first control circuit 113 is configured to control the drive circuit 120 to output the first drive voltage when the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, and control the drive circuit 120 to convert the voltage of the power battery 300 into the second drive voltage when the first switch circuit 111 is turned off and the second switch circuit 112 is turned on.

[0093] In the embodiment, when the power of the power battery 300 is greater than the power threshold, it indicates that the power of the power battery 300 is sufficient, and the output voltage is also high, which can meet the voltage requirement of the subsequent circuit. At this time, the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, and the drive circuit 120 is controlled by the first control circuit 113 to invert the voltage output by the power battery 300 into the first drive voltage. When the power of the power battery 300 is less than or equal to the power threshold, it indicates that the power of the power battery 300 is low and cannot provide a suitable voltage to drive the subsequent circuit to work. At this time, the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, and the drive circuit 120 is controlled by the first control circuit 113 to boost the voltage output by the power battery 300 to form the second drive voltage to meet the voltage requirement of the subsequent circuit.

[0094] In an embodiment, the motor controller 100 further includes a second control circuit 150. The second control circuit 150 is configured to control the first switch circuit 111 to be turned on and the second switch circuit 112 to be turned off when the power of the power battery 300 is greater than the power threshold, and control the first switch circuit 111 to be turned off and the second switch circuit 112 to be turned on when the power of the power battery 300 is less than or equal to the power threshold.

[0095] In this embodiment, the second control circuit 150 can communicate with the power battery 300 to obtain the power information of the power battery 300. When the power of the power battery 300 is greater than the power threshold, it indicates that the power of the power battery 300 is sufficient, and the output voltage is also higher, which can meet the voltage demand of the subsequent circuit. The second control circuit 150 controls the first switch circuit 111 to be turned on and the second switch circuit 112 to be turned off, and the first control circuit 113 controls the drive circuit 120 to inverse the voltage output by the power battery 300 into the first drive voltage. When the power of the power battery 300 is less than or equal to the power threshold, it indicates that the power of the power battery 300 is low and cannot provide a suitable voltage to drive the subsequent circuit to work. At this time, the second control circuit 150 controls the first switch circuit 111 to be turned off and the second switch circuit 112 to be turned on, and then the first control circuit 113 controls the drive circuit 120 to boost the voltage output by the power battery 300 to form the second drive voltage to meet the voltage demand of the subsequent circuit. In addition, by integrating the second control circuit 150 in the motor controller 100, the occupied space of the electric vehicle 10 can be reduced.

[0096] With reference to Figure 6 In an embodiment, the electric vehicle 10 further includes a three-phase motor 400, and each phase line of the three-phase motor 400 is provided with a third inductor L3, and the first inductor L1 is the third inductor L3 on any one phase line of the three-phase motor 400.

[0097] In this embodiment, in the electric vehicle 10 including a dual-motor or other multi-motor, the third inductor L3 on any one phase line of the three-phase motor 400 can be reused as the first inductor L1, which can further reduce the number of inductor devices used, and thus reduce the occupied space and cost of the motor controller 100.

[0098] In an embodiment, the electric vehicle 10 further includes a drive motor 500, and the motor controller 100 further includes a third control circuit 115 for controlling the drive motor 500 to work. By integrating the third control circuit 115 in the motor controller 100, the occupied space of the electric vehicle 10 can be reduced.

[0099] In an embodiment, the drive circuit 120 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, and a first capacitor C1.

[0100] The first end of the first switch tube Q1, the first end of the third switch tube Q3 and the first end of the fifth switch tube Q5 are electrically connected to constitute a first input end of the driving circuit 120, the first end of the second switch tube Q2, the first end of the fourth switch tube Q4 and the first end of the sixth switch tube Q6 are electrically connected to constitute a second input end of the driving circuit 120, the second end of the first switch tube Q1 and the second end of the second switch tube Q2 are electrically connected to constitute a first output end of the driving circuit 120, the second end of the third switch tube Q3 and the second end of the fourth switch tube Q4 are electrically connected to constitute a second output end of the driving circuit 120, and the second end of the fifth switch tube Q5 and the second end of the sixth switch tube Q6 are electrically connected to constitute a third output end of the driving circuit 120.

[0101] The first end of the first capacitor C1 is electrically connected to the first input end of the driving circuit 120, and the second end of the first capacitor C1 is electrically connected to the second input end of the driving circuit 120. The first input end of the driving circuit 120 is electrically connected to the second end of the first switch circuit 111, the second input end of the driving circuit 120 is electrically connected to the negative electrode of the power battery 300, and the second end of the first inductor L1 is electrically connected to the second end of the first switch tube Q1.

[0102] The first control circuit 113 is configured to control the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 to work to output the first driving voltage, or control the first switch tube Q1 and the second switch tube Q2 to work to output the second driving voltage.

[0103] In the embodiment, when the first switch circuit 111 is turned on and the second switch circuit 112 is turned off, the first control circuit 113 controls the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 to be turned on / off to invert, convert the voltage output by the power battery 300 or other input power supply voltage into the first driving voltage, and filter the first driving voltage through the second capacitor C2.

[0104] When the first switch circuit 111 is turned off and the second switch circuit 112 is turned on, the first control circuit 113 controls the first switch tube Q1 and the second switch tube Q2 to be turned on alternately, and cooperates with the first inductor L1 and the first capacitor C1 to boost the voltage output by the power battery 300 into the second driving voltage.

[0105] For example, when the first switch circuit 111 is off and the second switch circuit 112 is on, the first control circuit 113 can control the first switch Q1 and the second switch Q2 to act through constant pulse width modulation, and control other switches to be off. When the first switch Q1 is off and the second switch Q2 is on, the voltage output by the power battery 300 charges the first inductor L1, and the electrical energy is converted into magnetic energy and stored in the first inductor L1. The circuit equivalent diagram can refer to Figure 4 .

[0106] When the first switch Q1 is on and the second switch Q2 is off, the first inductor L1 discharges to the first capacitor C1, and the circuit equivalent diagram can refer to Figure 5 . Due to the energy storage effect of the first inductor L1, the voltage across the first capacitor C1 is pumped up. After the voltage is stabilized through the first capacitor C1, the output second driving voltage can be higher than the input voltage of the power battery 300, thereby realizing the function of voltage boosting. Further, by adjusting the duty cycle of the constant pulse width modulation output by the first control circuit 113, the switching frequency of the first switch and the second switch Q2 can be adjusted, and the voltage boosting multiple of the output second driving voltage can be adjusted:

[0107] D=1-V in / V out ;

[0108] Wherein, D is the duty cycle, V in is the input voltage of the power battery 300, V out is the output second driving voltage, and the voltage boosting multiple is V out / V in。

[0109] In an embodiment, the driving circuit 120 can further include a second capacitor C2. The second capacitor C2 is used to filter the voltage output by the power battery 300.

[0110] The application controls the discharge path of the power battery 300 through the first switch circuit 111 and the second switch circuit 112, and controls the driving circuit 120 to work through the first control circuit 113, so that the first driving voltage can be invertered and output, and the second driving voltage can be boosted and output. The application boosts the voltage output by the power battery 300 through the first inductor L1 and the driving circuit 120, so as to meet the voltage demand of the subsequent circuit, and improves the power of the electric vehicle 10. The application integrates the voltage boosting function on the driving circuit 120, reduces the number of electronic devices used, reduces the cost of the motor controller 100, and also reduces the occupied space of the motor controller 100, thereby improving the economy of the electric vehicle 10.

[0111] The application further provides a motor control system, which comprises a first motor 210, a second motor 220 and the motor controller 100. The motor controller 100 is configured to output a first driving voltage or a second driving voltage to drive the first motor 210 and / or the second motor 220 to work, and the second driving voltage is greater than the first driving voltage. The motor control system can be applied to a pure electric driving device or a hybrid electric-oil driving device.

[0112] The detailed structure of the motor controller 100 can refer to the above-mentioned embodiments, which will not be described here again. It can be understood that, since the motor controller 100 is used in the motor control system of the application, the embodiments of the motor control system of the application include all the technical solutions of all the embodiments of the motor controller 100, and the same technical effects are achieved, which will not be described here again.

[0113] In an embodiment, the motor control system further comprises an engine, and the first motor 210 is configured to drive the engine to work.

[0114] In the embodiment, the motor control system can be applied to a hybrid electric-oil driving device, such as a hybrid electric vehicle. The first motor 210 can be a generator.

[0115] In an embodiment, the motor control system further comprises a discharging interface 600, which is configured to be electrically connected with a powered device, and the discharging interface 600 is configured to output the second driving voltage to the powered device.

[0116] For example, the motor control system can be applied to an electric vehicle 10, and the powered device can be another electric vehicle 10 or other electronic devices that need to be charged. When discharging from one vehicle to another, if the voltage of the power battery of the powered vehicle is relatively high, the voltage of the power battery 300 can be boosted to the second driving voltage by the motor controller 100 to meet the charging demand of the powered vehicle.

[0117] The application further provides a motor control system, which comprises a three-phase motor 400, a second motor 220 and the motor controller 100. The motor controller 100 is configured to output a first driving voltage or a second driving voltage, the first driving voltage is configured to drive the three-phase motor 400 to work, and the second driving voltage is configured to drive the second motor 220 to work, and the second driving voltage is greater than the first driving voltage.

[0118] The detailed structure of the motor controller 100 can refer to the above-mentioned embodiments, which will not be described here again. It can be understood that, since the motor controller 100 is used in the motor control system of the application, the embodiments of the motor control system of the application include all the technical solutions of all the embodiments of the motor controller 100, and the technical effects achieved are also completely the same, which will not be described here again.

[0119] In an embodiment, the electric vehicle 10 further comprises a discharging interface 600, the discharging interface 600 is used for electrically connecting with a power receiving device, and the discharging interface 600 is used for outputting the second driving voltage to the power receiving device.

[0120] In the embodiment, the power receiving device can be another electric vehicle 10 or other electronic device requiring charging. For example, when discharging between vehicles, if the power battery voltage of the power receiving vehicle is relatively high, the voltage of the power battery 300 can be boosted to the second driving voltage by the motor controller 100 to meet the charging demand of the power receiving vehicle.

[0121] The application further provides an electric vehicle 10, which comprises the power battery 300 and the above-mentioned motor control system. The electric vehicle can be an electric-oil hybrid electric vehicle or a pure electric vehicle.

[0122] The detailed structure of the motor control system can refer to the above-mentioned embodiments, which will not be described here again. It can be understood that, since the motor control system is used in the electric vehicle 10 of the application, the embodiments of the electric vehicle 10 of the application include all the technical solutions of all the embodiments of the motor control system, and the technical effects achieved are also completely the same, which will not be described here again.

[0123] In the above, the specific embodiments of the application are described with reference to the accompanying drawings. However, those skilled in the art can understand that various changes and replacements can be made to the specific embodiments of the application without departing from the spirit and scope of the application. These changes and replacements are within the scope defined by the application.

Claims

1. A motor controller for controlling the operation of a motor and simultaneously controlling the output voltage of a power battery, characterized in that, The motor controller includes a switch control circuit and a drive circuit. In a first operating mode, the switch control circuit controls the drive circuit to output a first drive voltage. In a second operating mode, the switch control circuit controls the drive circuit to output a second drive voltage. The magnitude of the first drive voltage is equal to the voltage of the power battery to be controlled, and the second drive voltage is greater than the voltage of the power battery to be controlled.

2. The motor controller as described in claim 1, characterized in that, The switch control circuit includes a first switch circuit, a second switch circuit, a first inductor, and a first control circuit; The first control circuit is configured to control the drive circuit to output the first drive voltage when the first switch circuit is turned on and the second switch circuit is turned off; and to control the drive circuit to convert the voltage of the power battery to be controlled into the second drive voltage when the first switch circuit is turned off and the second switch circuit is turned on.

3. The motor controller as described in claim 2, characterized in that, The motor controller also includes a second control circuit; The second control circuit is used to control the first switching circuit and the second switching circuit to be turned on / off according to the power battery to be controlled.

4. The motor controller as described in claim 3, characterized in that, The second control circuit is used to control the first switch circuit to be turned on and the second switch circuit to be turned off when the power battery charge is greater than the power battery charge threshold; and to control the first switch circuit to be turned off and the second switch circuit to be turned on when the power battery charge is less than or equal to the power battery charge threshold.

5. The motor controller as described in claim 2, characterized in that, The motor has a second inductor on each phase line, and the first inductor is the second inductor on any one phase line of the motor.

6. The motor controller as described in claim 2 or 3, characterized in that, The motor includes a first motor and a second motor, and the drive circuit is electrically connected to the first motor; the drive circuit is used to convert the voltage output by the first motor into a first drive voltage. The motor controller also includes a third control circuit, which is used to control the operation of the second motor.

7. The motor controller as described in claim 2, characterized in that, The driving circuit includes a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, and a first capacitor; The first terminal of the first switch, the first terminal of the third switch, and the first terminal of the fifth switch are all electrically connected to form the first input terminal of the driving circuit. The first terminal of the second switch, the first terminal of the fourth switch, and the first terminal of the sixth switch are all electrically connected to form the second input terminal of the driving circuit. The second terminal of the first switch and the second terminal of the second switch are electrically connected to form the first output terminal of the driving circuit. The second terminal of the third switch and the second terminal of the fourth switch are electrically connected to form the second output terminal of the driving circuit. The second terminal of the fifth switch and the second terminal of the sixth switch are electrically connected to form the third output terminal of the driving circuit. The first terminal of the first capacitor is electrically connected to the first input terminal of the driving circuit, and the second terminal of the first capacitor is electrically connected to the second input terminal of the driving circuit. The first input terminal of the drive circuit is electrically connected to the second terminal of the first switching circuit, the second input terminal of the drive circuit is electrically connected to the negative terminal of the power battery, and the second terminal of the first inductor is electrically connected to the second terminal of the first switching transistor. The first control circuit is used to control the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch to operate so as to output a first driving voltage; or, to control the first switch and the second switch to operate so as to output a second driving voltage.

8. A motor controller for use in an electric vehicle, the electric vehicle including a power battery, characterized in that, The motor controller includes a switch control circuit and a drive circuit. The switch control circuit is used to control the drive circuit to output a first drive voltage when the power battery charge is greater than a charge threshold, and to control the drive circuit to output a second drive voltage when the power battery charge is less than or equal to the charge threshold. The magnitude of the first drive voltage is equal to the voltage of the power battery, and the second drive voltage is greater than the voltage of the power battery.

9. The motor controller as described in claim 8, characterized in that, The switch control circuit includes a first switch circuit, a second switch circuit, a first inductor, and a first control circuit; The first control circuit is configured to control the drive circuit to output the first drive voltage when the first switch circuit is turned on and the second switch circuit is turned off; and to control the drive circuit to convert the voltage of the power battery into the second drive voltage when the first switch circuit is turned off and the second switch circuit is turned on.

10. The motor controller as described in claim 9, characterized in that, The motor controller also includes a second control circuit; The second control circuit is used to control the first switch circuit to be turned on and the second switch circuit to be turned off when the power battery charge is greater than the charge threshold; and to control the first switch circuit to be turned off and the second switch circuit to be turned on when the power battery charge is less than or equal to the charge threshold.

11. The motor controller as described in claim 9, characterized in that, The electric vehicle also includes a three-phase motor, and each phase of the three-phase motor is provided with a third inductor, wherein the first inductor is the third inductor on any one phase of the three-phase motor.

12. The motor controller as described in claim 9 or 10, characterized in that, The electric vehicle also includes a drive motor, and the motor controller further includes a third control circuit, which is used to control the operation of the drive motor.

13. The motor controller as described in claim 9, characterized in that, The driving circuit includes a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, a sixth switching transistor, and a first capacitor; The first terminal of the first switch, the first terminal of the third switch, and the first terminal of the fifth switch are all electrically connected to form the first input terminal of the driving circuit. The first terminal of the second switch, the first terminal of the fourth switch, and the first terminal of the sixth switch are all electrically connected to form the second input terminal of the driving circuit. The second terminal of the first switch and the second terminal of the second switch are electrically connected to form the first output terminal of the driving circuit. The second terminal of the third switch and the second terminal of the fourth switch are electrically connected to form the second output terminal of the driving circuit. The second terminal of the fifth switch and the second terminal of the sixth switch are electrically connected to form the third output terminal of the driving circuit. The first terminal of the first capacitor is electrically connected to the first input terminal of the driving circuit, and the second terminal of the first capacitor is electrically connected to the second input terminal of the driving circuit. The first input terminal of the drive circuit is electrically connected to the second terminal of the first switching circuit, the second input terminal of the drive circuit is electrically connected to the negative terminal of the power battery, and the second terminal of the first inductor is electrically connected to the second terminal of the first switching transistor. The first control circuit is used to control the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch to operate so as to output a first driving voltage; or, to control the first switch and the second switch to operate so as to output a second driving voltage.

14. A motor control system, characterized in that, The motor control system includes a first motor, a second motor, and a motor controller as described in any one of claims 1 to 7; The motor controller is used to output a first driving voltage or a second driving voltage to drive the first motor and / or the second motor to work; the second driving voltage is greater than the first driving voltage.

15. The motor control system as described in claim 14, characterized in that, The motor control system includes an engine, and the first motor is used to drive the engine.

16. The motor control system as described in claim 14 or 15, characterized in that, The motor control system also includes a discharge interface; The discharge interface is used for electrical connection with the powered device, and the discharge interface is used for outputting the second driving voltage to the powered device.

17. A motor control system, characterized in that, The motor control system includes a three-phase motor, a drive motor, and a motor controller as described in any one of claims 8 to 13; The motor controller is used to output a first driving voltage or a second driving voltage; the first driving voltage is used to drive the three-phase motor to work, and the second driving voltage is used to drive the drive motor to work. The second driving voltage is greater than the first driving voltage.

18. The motor control system as described in claim 17, characterized in that, The motor control system also includes a discharge interface; The discharge interface is used for electrical connection with the powered device, and the discharge interface is used for outputting the second driving voltage to the powered device.

19. An electric vehicle, characterized in that, The electric vehicle includes a power battery and a motor controller as described in any one of claims 1-13 or a motor control system as described in any one of claims 14-18.

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