Inverter multiplexing circuit, method and controller

Abstract

The embodiment of the invention provides a multiplexing circuit and method of an inverter and a controller. The inverter multiplexing circuit comprises an inverter and a transformer, and the inverter is used for connecting a first power supply and a motor of a vehicle or connecting the first power supply and a second power supply; the transformer is used for connecting the first power supply and the inverter under the condition that the inverter is connected with the first power supply and the second power supply. According to the embodiment of the invention, the corrected voltage can be transformed through the transformer, so that the DC power supply can be charged based on multiplexing of the inverter, the structure is simple, the stability is high, the problem that the inverter is not matched with the circuit during multiplexing is avoided, and the stability of the multiplexing circuit and the safety of the DC power supply are improved.

Description

Technical Field

[0001] This disclosure relates to the field of electronic technology, and more specifically, to multiplexing circuits, methods, and controllers for inverters. Background Technology

[0002] With the development of vehicles, new energy vehicles powered by batteries have gradually become one of the mainstream in the automotive field. Among them, new energy vehicles powered by batteries include pure electric vehicles, range-extended electric vehicles, and fuel cell electric vehicles, whose structure mainly involves battery systems, control systems, and charging systems.

[0003] In the aforementioned new energy vehicles, the control system further includes the vehicle control system, motor control system, and auxiliary control system. The control system often needs to execute multiple sets of control logic; for example, it needs to control the motor's operation when the vehicle is running, and control the battery charging logic when the vehicle is charging. Therefore, a high-quality, highly reliable, and low-cost control system is crucial for these new energy vehicles. Summary of the Invention

[0004] Embodiments of this disclosure provide multiplexing circuits, methods, and controllers for inverters.

[0005] In a first aspect of this disclosure, a multiplexing circuit for an inverter is provided, comprising: an inverter configured to connect a first power source of a vehicle to a motor, or configured to connect a first power source to a second power source; and a transformer configured to connect the first power source to the inverter when the inverter is connected to both the first and second power sources.

[0006] In a second aspect of this disclosure, a method for multiplexing an inverter is provided. The method includes controlling the inverter to connect between a first power source and a motor in a vehicle, or between a first power source and a second power source. The method further includes, when the inverter is connected between the first and second power sources, controlling a transformer to connect the first power source and the inverter.

[0007] In a third aspect of this disclosure, a controller is provided, including at least one processor; and a memory coupled to the at least one processor and having instructions stored thereon, which, when executed by the at least one processor, cause the controller to perform the method provided according to a second aspect of this disclosure.

[0008] In a fourth aspect of this disclosure, a vehicle is provided, including circuitry provided according to the first aspect and / or a controller provided according to the third aspect.

[0009] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify key or principal features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0010] The above and other objects, features and advantages of this disclosure will become more apparent from the more detailed description of exemplary embodiments thereof taken in conjunction with the accompanying drawings, in which the same reference numerals generally denote the same components.

[0011] Figure 1 A block diagram of the multiplexing circuit of an inverter according to some embodiments of the present disclosure is shown;

[0012] Figure 2 A schematic diagram of a transformer for step-down voltage according to some embodiments of the present disclosure is shown;

[0013] Figure 3 A schematic diagram of a transformer for step-up voltage according to some embodiments of the present disclosure is shown;

[0014] Figure 4 Schematic diagrams of transformers for step-down and step-up voltages according to some embodiments of the present disclosure are shown;

[0015] Figure 5 A schematic diagram of the multiplexing circuit of an inverter according to some embodiments of the present disclosure is shown;

[0016] Figure 6 Another schematic diagram of the multiplexing circuit of an inverter according to some embodiments of the present disclosure is shown;

[0017] Figure 7 Schematic diagrams of inverters according to some embodiments of this disclosure are shown; and

[0018] Figure 8 A flowchart illustrating a multiplexing method for an inverter according to some embodiments of this disclosure is shown. Detailed Implementation

[0019] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Those skilled in the art can derive alternative technical solutions from the following description without departing from the spirit and scope of the present disclosure.

[0020] The term “comprising” and its variations as used herein signify open inclusion, i.e., “including but not limited to”. Unless otherwise stated, the term “or” means “and / or”. The term “based on” means “at least partially based on”. The term “an embodiment” means “at least one example embodiment”. Other explicit and implicit definitions may also be included below.

[0021] As mentioned above, the control system is a core component of battery-powered new energy vehicles, involving various components such as the traction inverter. During vehicle operation, the traction inverter is used to convert the DC power output from the DC power supply into AC power suitable for the vehicle's motor. During vehicle charging, the on-board charger (OBC), which includes a power factor correction (PFC) unit, is used to convert the current output from the power grid into a current suitable for charging the DC power supply. Because the required electronic components differ and cannot be reused depending on the vehicle's mode and function, vehicle control systems often suffer from high hardware costs, large size, and numerous components, increasing the operating expenses of the vehicle. Furthermore, if transistors from the inverter are directly used as components in the power factor correction unit, the inverter transistors may not be compatible with the on-board charger circuitry, potentially damaging the vehicle's DC power supply.

[0022] This disclosure provides an inverter multiplexing circuit in its embodiments. In this multiplexing circuit, the inverter is used to connect a DC power supply and a motor, or to connect a DC power supply and an external power supply. During the process of the inverter connecting the DC power supply and the external power supply to charge the DC power supply, a transformer transforms the corrected voltage, enabling the DC power supply to be adaptively charged based on the inverter. This design is simple in structure and highly stable, avoiding the problem of incompatibility between the inverter and the circuit during inverter multiplexing, and improving the stability of the control system and the safety of the DC power supply.

[0023] Figure 1 A block diagram of a multiplexing circuit 100 of an inverter according to some embodiments of the present disclosure is shown. (See reference...) Figure 1 The inverter's multiplexing circuit 100 includes an inverter 104 configured to connect the vehicle's first power supply 102 to the motor 106, or configured to connect the first power supply 102 to the second power supply 108; and a transformer 110 configured to connect the first power supply 102 to the inverter 104 when the inverter 104 is connected to the first power supply 102 and the second power supply 108.

[0024] In some embodiments, when the vehicle is in motion, the motor 106 obtains electrical energy from the first power source 102 and drives the vehicle. An inverter 104 is connected between the first power source 102 and the motor 106. For example, the motor 106 is an AC motor, which may include a three-phase AC motor or a single-phase AC motor. The inverter 104 may include multiple transistors, and the inverter 104 performs its inversion function by controlling the on / off state of these transistors, thereby obtaining an AC current adapted to the motor 106. When the vehicle is charging, the first power source 102 obtains electrical energy from the second power source 108. The inverter 104 is connected between the second power source 108 and the first power source 102, and the output power of the second power source 108 is corrected using multiple transistors to obtain a charging power adapted to the first power source 102.

[0025] In some embodiments, when the vehicle is charging, a transformer 110 is further provided between the inverter 104 and the first power supply 102 to transform the output voltage of the inverter 104 so that the corrected voltage is adapted to the first power supply 102. When the voltage corrected by the inverter 104 is higher than the charging voltage of the first power supply 102, the transformer 110 is used to step down the voltage corrected by the inverter 104; when the voltage corrected by the inverter 104 is lower than the charging voltage of the first power supply 102, the transformer 110 is used to step up the voltage corrected by the inverter 104.

[0026] In some embodiments, the first power source 102 is a DC power source for the vehicle, including but not limited to lithium iron phosphate batteries, ternary lithium batteries, lead-acid batteries, nickel-metal hydride batteries, or any combination thereof, and the second power source 108 is an AC power source, such as mains power. It should be understood that the examples listed herein are only for illustrative purposes and do not constitute a limitation on the first power source 102 and the second power source 108.

[0027] In this way, in the multiplexing circuit 100, the inverter 104 is used to connect the first power supply 102 and the motor 106, or to connect the first power supply 102 and the second power supply 108. During the process of the inverter 104 connecting the first power supply 102 and the second power supply 108 to charge the first power supply 102, a transformer is used to transform the corrected voltage, enabling the first power supply 102 to be adaptively charged based on the inverter 104. This method is simple in structure and highly stable, avoiding the problem of incompatibility between the inverter 104 and the circuit 100 during multiplexing, thus improving the stability of the circuit 100 and the safety of the first power supply 102.

[0028] In some embodiments, the transformer 110 includes a first set of transistors, a first capacitor C1, and a first inductor L1, wherein the first capacitor C1 is connected in parallel with the first power supply 102, and the first set of transistors is configured to connect the inverter 104 and the first capacitor C1 to a first discharge circuit of the first inductor L1 when the transformer 110 steps up, or to connect the first capacitor C1 to a second discharge circuit of the first inductor L1 and disconnect the inverter 104 from the first inductor L1 when the transformer 110 steps down.

[0029] In some embodiments, the transformer 110 includes multiple transistors (which may be referred to as the first group of transistors), a capacitor C1, and an inductor L1, with the capacitor C1 connected in parallel with the first power supply 102. It should be understood that the terminal voltage of the capacitor C1 is the input voltage when the first power supply 102 is charging. When the output voltage of the inverter 104 is higher than the charging voltage of the first power supply 102, the transformer 110 operates in a step-down state. The state settings of the multiple transistors ensure that when the inductor L1 discharges, the capacitor C1 is connected in the discharge circuit (which may be referred to as the second discharge circuit), and the inverter 104 is not connected in the discharge circuit. At this time, the charging voltage of the first power supply 102 (i.e., the terminal voltage of the capacitor C1) is determined by the inductor L1. When the output voltage of inverter 104 is lower than the charging voltage of the first power supply 102, transformer 110 operates in boost mode. Through the state settings of multiple transistors, when inductor L1 discharges, capacitor C1 and inverter 104 are both connected in the discharge circuit (which can be called the first discharge circuit). At this time, the charging voltage of the first power supply 102 is jointly determined by the output voltage of inductor L1 and inverter 104.

[0030] In this way, the inverter 104 is used for current inversion and power correction in the multiplexing circuit 100. During the charging process of the first power supply 102, the corrected voltage is transformed by the transformer 110. The connection of capacitor C1 and inductor L1 is adjusted based on multiple transistors in the transformer 110 to achieve voltage boost or buck. The structure is simple and highly stable, avoiding the problem of incompatibility between the inverter 104 and the circuit when multiplexing, and improving the stability of the control system and the safety of the first power supply 102.

[0031] Figure 2 A schematic diagram of a transformer 110 for step-down voltage analysis according to some embodiments of the present disclosure is shown. In some embodiments, the transformer 110 includes a plurality of transistors, including transistor Q1 and transistor Q2, and an inverter 104, transistor Q1, and transistor Q2 are connected to form a loop. A capacitor C1 and an inductor L1 are connected in series and then in parallel with transistor Q2. (See reference...) Figure 2The transformer 110 has interfaces 1 and 2 connected to the inverter 104, and interfaces 3 and 4 connected to the first power supply 102. Capacitor C5 is a voltage stabilizing capacitor. Transistors Q1 and Q2 act as switching transistors, turning on and off at a certain frequency to form a continuous buck cycle. It should be understood that in each buck cycle, inductor L1 obtains corrected energy from the second power supply 108 from the inverter 104 during the charging phase (which can be called the first charging phase), and discharges to the first power supply 102 during the discharging phase (which can be called the first discharging phase).

[0032] During the charging phase of inductor L1, transistor Q1 is turned on and transistor Q2 is turned off. At this time, the current corrected by inverter 104 flows through inductor L1 and capacitor C1, charging inductor L1. During the discharging phase of inductor L1, transistor Q1 is turned off and transistor Q2 is turned on. Inverter 104 is disconnected from inductor L1, and the current output from inductor L1 flows through capacitor C1 and the first power supply 102 to discharge (forming a second discharge circuit for inductor L1). The input voltage of the first power supply 102 at this time is the terminal voltage of capacitor C1. In this way, by periodically switching the on / off states of transistors Q1 and Q2, the first power supply 102 can be continuously charged at a reduced voltage. The control logic is simple, requiring only the generation of modulation signals for transistors Q1 and Q2, thus reducing the cost of transformer 110.

[0033] Figure 3 A schematic diagram of a transformer 110 for step-up voltage analysis according to some embodiments of the present disclosure is shown. In some embodiments, the transformer 110 includes a plurality of transistors, including transistors Q3 and Q4. An inverter 104, an inductor L1, and transistor Q4 are connected to form a loop. Transistor Q3 and capacitor C1 are connected in series and then in parallel with transistor Q4. (Reference) Figure 3 The transformer 110 has interfaces 1 and 2 connected to the inverter 104, and interfaces 3 and 4 connected to the first power supply 102. Capacitor C5 is a voltage stabilizing capacitor. Transistors Q3 and Q4 act as switching transistors, turning on and off at a certain frequency to form a continuous boost cycle. It should be understood that during each boost cycle, inductor L1 obtains corrected energy from the second power supply 108 from the inverter 104 during the charging phase (which can be called the second charging phase), and discharges to the first power supply 102 during the discharging phase (which can be called the second discharging phase).

[0034] During the charging phase of inductor L1, transistor Q4 is turned on, and the current corrected by inverter 104 flows through inductor L1, charging it. During the discharging phase of inductor L1, transistor Q3 is turned on and transistor Q4 is turned off. The current output from inductor L1 and inverter 104 flows through capacitor C1 and the first power supply 102 (forming the first discharge circuit of inductor L1). Both capacitor C1 and inverter 104 are connected in this discharge circuit. At this time, the charging voltage of the first power supply 102 is jointly determined by the output voltage of inductor L1 and inverter 104. Specifically, the charging voltage of the first power supply 102, i.e., the terminal voltage of capacitor C1, is the sum of the terminal voltage of inductor L1 and the terminal voltage of inverter 104. In this way, the first power supply 102 can be continuously boosted and charged by periodically switching the on states of transistors Q3 and Q4. The control logic is simple, requiring only the generation of modulation signals for transistors Q3 and Q4, thereby reducing the cost of transformer 110.

[0035] Figure 4 A schematic diagram of a transformer 110 for step-down and step-up voltage conversion according to some embodiments of the present disclosure is shown. In some embodiments, a first terminal of inductor L1 is connected to transistors Q1 and Q2, and a second terminal is connected to transistors Q3 and Q4. When transformer 110 operates in step-down mode, transistor Q3 is turned on and transistor Q4 is turned off (i.e., transformer 110 operates in step-up mode). Figure 2 (As shown in the diagram), by periodically switching the on states of transistors Q1 and Q2, step-down charging of the first power supply 102 can be achieved. When the transformer 110 operates in step-up mode, transistor Q1 is on and transistor Q2 is off (i.e., the transformer 110 operates in step-up mode). Figure 3 (As shown in the diagram), by periodically switching the conduction states of transistors Q3 and Q4, the first power supply 102 can be boosted and charged. In this way, the boost and buck states of transformer 110 can be switched by controlling the conduction states of transistors Q1, Q2, Q3, and Q4. The switching logic is simple and easy to implement, thereby reducing the cost of transformer 110.

[0036] In some embodiments, reference Figures 2-4Transistors Q1, Q2, Q3, and Q4 are each configured as a field-effect transistor (FET) and a diode connected in parallel. The FET is a semiconductor device that uses the electric field effect of the input circuit to control the current in the output circuit, while the diode is an electronic component with unidirectional current conduction characteristics. The parallel connection of the FET and diode implements the conduction control logic for transistors Q1, Q2, Q3, and Q4. In this way, multiple conduction control logics can be implemented for each transistor, thereby achieving boost and buck control of transformer 110.

[0037] Figure 5 A schematic diagram of a multiplexing circuit 100 of an inverter according to some embodiments of the present disclosure is shown. In some embodiments, the circuit 100 includes a set of switches, namely switches S1 and S2 (which may be referred to as a first set of switches), connected between a first power supply 102 and a motor 106, and a set of switches, namely switches S3 and S4 (which may be referred to as a second set of switches), connected between the first power supply 102 and a second power supply 108. When switches S1 and S2 are on and switches S3 and S4 are off, the inverter 104 is connected between the first power supply 102 and the motor 106, and the inverter 104 is used to invert the current output from the first power supply 102. When switches S1 and S2 are off and switches S3 and S4 are on, the inverter 104 is connected between the first power supply 102 and the second power supply 108, and the inverter 104 is used to correct the output power of the second power supply 108. In this way, the inverter 104 can be connected to different working circuits to switch the working state of the inverter 104 based on the on / off control of a set of switches S1 and S2 and a set of switches S3 and S4. The switching logic is simple, thereby reducing the cost of circuit 100.

[0038] In some embodiments, switch S1 includes switches S11 and S12, which are connected between the first power supply 102 and the inverter 104 to control the current loop between the first power supply 102 and the inverter 104. Switch S2 includes switches S21, S22, and S23, which are respectively connected between the inverter 104 and the motor 106. When the inverter 104 is connected to the motor 106, the number of switches S21, S22, and S23 that are turned on can be set according to the number of input terminals of the motor 106, i.e., whether the motor 106 is a three-phase AC motor or a single-phase AC motor. In this way, the switching of the motor 106 between three-phase input and single-phase input can be realized based on the control of switches S21, S22, and S23, thereby improving the applicability of circuit 100.

[0039] In some embodiments, switch S3 includes switches S31, S32, and S33, which are respectively connected between inverter 104 and the second power supply 108. When inverter 104 is connected to the second power supply 108, the number of switches S31, S32, and S33 that are turned on can be determined based on the number of output terminals of the second power supply 108, i.e., whether the second power supply 108 is a single-phase or three-phase power supply. Switch S4 includes switches S41 and S42, which are connected between the first power supply 102 and transformer 110, and are used to control the current loop between transformer 110 and the first power supply 102. In this way, the switching of the second power supply 108 between single-phase and three-phase output can be realized based on the control of switches S31, S32, and S33, thereby improving the applicability of circuit 100.

[0040] In some embodiments, circuit 100 further includes inductor L2, which comprises inductors L21, L22, and L23. Inductors L21, L22, and L23 are respectively connected between inverter 104 and motor 106 to adjust the instantaneous current flowing from inverter 104 to motor 106. In this way, the stability of the input current to motor 106 can be ensured, avoiding damage to motor 106 due to transient current changes, thereby improving the stability of circuit 100.

[0041] In some embodiments, the second power supply 108 is mains power. The circuit 100 includes a socket 114 and an AC filter 112. The socket 114 is used to connect the vehicle's charging plug, and the AC filter 112 is connected between the inverter 104 and the socket 114 to filter the AC power flowing out of the socket 114. In this way, the stability of the current can be improved and electromagnetic interference can be reduced.

[0042] Figure 6 Another schematic diagram of a multiplexing circuit 100 of an inverter according to some embodiments of the present disclosure is shown. In some embodiments, the inverter 104 includes capacitors C2 and C3, which are connected in series and then connected in parallel with a first power supply 102. The inverter 104 also includes at least one set of transistors (which may be referred to as a second set of transistors), such as transistors Q5, Q6, Q7, and Q8. The first terminal of transistor Q5 is connected between capacitors C2 and C3, and its second terminal is connected to the first terminal of transistor Q6 and forms a back-to-back connection with transistor Q6. The second terminal of transistor Q6 is connected between transistors Q7 and Q8. Transistors Q6, Q7, and Q8 are simultaneously connected to one input terminal of motor 106. The inverter 104 forms a T-type three-level inverter.

[0043] refer to Figure 6 Capacitors C2 and C3 are capacitors with identical parameters. In circuit 100, point P is connected to the positive terminal of the first power supply 102, point N is connected to the negative terminal of the first power supply 102, point O is the center potential point between points P and N, and points A, B, and C are respectively connected to the three phase input ports of the motor 106. In some embodiments, circuit 100 further includes capacitor C4 for regulating the output voltage of the first power supply 102.

[0044] refer to Figure 6 At least one set of transistors may further include transistors Q9, Q10, Q11, Q12, Q13, Q14, Q15, and Q16. The connection relationships of transistors Q9, Q10, Q11, and Q12, as well as those of transistors Q13, Q14, Q15, and Q16, are similar to those of transistors Q5, Q6, Q7, and Q8, and will not be described in detail here. In some embodiments, inductors L21, L22, and L23 are respectively connected between the above three sets of transistors and the input terminal of motor 106.

[0045] Compared to other types of inverters, the inverter 104 in this embodiment has lower energy loss, better electromagnetic compatibility and motor isolation capability, and better adaptability to different voltage environments, such as 800V.

[0046] The inverter 104, composed of capacitors C2 and C3 and transistors Q5-Q16, can also function as a power factor corrector in the charging circuit when the first power supply 102 is charging. The charging circuit of the first power supply 102 in this disclosure can be used in a 220V or 380V voltage environment. Depending on the number of phases of the second power supply 108, the charging circuit can be either a single-phase or three-phase circuit. Furthermore, the charging circuit can also be applied to current environments such as 16A, 32A, and 63A, and the operating power of the charging circuit can vary from 7kW to 40kW. It should be understood that the above are merely examples of the charging circuit in this disclosure, and this disclosure does not impose any limitations on the charging circuit. The following will be combined with... Figure 6 Describe in detail the multiplexing process of inverter 104.

[0047] In some embodiments, during the operation of the motor 106 (when the first power supply 102 is in the first discharge state), switches S11, S12, S21, S22 and S23 are turned on, and switches S31, S32, S33, S41 and S42 are turned off. The inverter 104 (including capacitors C2 and C3 and transistors Q5 to Q16) is connected between the first power supply 102 and the motor 106, and acts as a T-type three-level inverter to invert the output current of the first power supply 102.

[0048] In some embodiments, during the charging period of the first power supply 102 (i.e., the first power supply 102 is in the first charging state), switches S11, S12, S21, S22 and S23 are turned off, and switches S31, S32, S33, S41 and S42 are turned on. Current flows into the first power supply 102 from the second power supply 108, socket 114, AC filter 112, inductors L21-L23, inverter 104 (including capacitors C2 and C3 and transistors Q5-Q16), and transformer 110 (including capacitor C1, inductor L1, and transistors Q1-Q4).

[0049] When the second power supply 108 is a three-phase power supply, the inverter 104 functions as a three-phase power factor corrector. When the second power supply 108 is a single-phase power supply, any one of switches S31, S32, and S33 is turned off, and the inverter 104 functions as a single-phase power factor corrector. When the output voltage of the inverter 104 is higher than the charging voltage of the first power supply 102, the transformer 104 enters buck mode. When the output voltage of the inverter 104 is lower than the charging voltage of the first power supply 102, the transformer 104 enters boost mode.

[0050] In some embodiments, when the first power supply 102 is used to supply power to an external device (i.e., the first power supply 102 is in a second discharge state), switches S11, S12 (collectively referred to as the first switch S1), S31, S32, and S33 (collectively referred to as the third switch S3) are turned on, while switches S21, S22, and S23 (collectively referred to as the second switch S2), S41, and S42 (collectively referred to as the fourth switch S4) are turned off. The inverter 104 is used to invert the current output by the first power supply 102. The inverted current flows into the external device through switches S31, S32, and S33, so that the inverted current can be adapted to the external device, such as household appliances or camping equipment. It should be understood that during the process of supplying power to the external device, since the socket 114 is always in an open state, the second power supply 108 will not be connected to the circuit 100.

[0051] In some embodiments, when the vehicle is in the kinetic energy recovery stage (at which time the first power supply 102 is in the second charging state), switches S21, S22, and S23 (collectively referred to as the second switch S2), S41, and S42 (collectively referred to as the fourth switch S4) are turned on, and switches S11, S12 (collectively referred to as the first switch S1), S31, S32, and S33 (collectively referred to as the third switch S3) are turned off. At this time, the inverter 104 is used as a power factor corrector to correct the power output of the motor 106, and the transformer 106 transforms the voltage corrected by the inverter 104.

[0052] Figure 7 A schematic diagram of an inverter 104 according to some embodiments of the present disclosure is shown. In some embodiments, the present disclosure also provides inverters different from those described herein. Figure 6 Another inverter shown is the one depicted. (Reference) Figure 7 The inverter 104 includes three sets of transistors: transistors Q7 and Q8, transistors Q11 and Q12, and transistors Q15 and Q16. Transistors Q7 and Q8 are connected in series and then connected in parallel with the first power supply 102. One input terminal of the motor 106 is connected to both transistors Q7 and Q8. The connection relationships of transistors Q11 and Q12, and transistors Q15 and Q16 are similar to those of transistors Q7 and Q8, and will not be described in detail here. Capacitor C4 serves as a voltage regulator capacitor to regulate the output voltage of the first power supply 102.

[0053] Figure 8 A flowchart illustrating an inverter multiplexing method 800 according to some embodiments of the present disclosure is provided. In some embodiments, method 800 may be executed by a vehicle controller, and the controlled object involved in method 800 may include, for example, a vehicle controller. Figures 1-8 The various electronic devices in the process. It should be understood that method 800 may also include additional actions not shown and / or the actions shown may be omitted, and the scope of this disclosure is not limited in this respect. Figure 8 The control processes shown have been described in detail above and will not be repeated here.

[0054] At point 802, with the inverter 104 connected between the first power supply 102 and the second power supply 108, the state of the transformer 110 is determined. The state of the transformer 110 includes a boost state and a buck state. In some embodiments, the controller may first determine the voltage output by the inverter 104 after correcting the power of the second power supply 108, and compare the voltage output by the inverter 104 with the rated charging voltage of the first power supply 102, thereby determining whether the state of the transformer 110 is a boost state or a buck state based on the voltage comparison result.

[0055] At point 804, based on the state of transformer 110, a first control signal is generated for a group of transistors in transformer 110. In some embodiments, the first control signal is a periodic signal, such as a pulse signal. The first pulse signal can cause the transistors in the group of transistors to periodically turn on and off.

[0056] At 806, a first control signal is sent to a group of transistors to control the transformer 110 to connect the inverter 104 and the first capacitor C1 to the first discharge circuit of the first inductor L1 when the transformer 110 is boosted, and to control the transformer 110 to connect the first capacitor C1 to the second discharge circuit of the first inductor L1 and disconnect the inverter 104 from the first inductor L1 when the transformer 110 is bucked, wherein the first capacitor C1 is connected in parallel with the first power supply 102.

[0057] In this way, the inverter 104 is used for current inversion and power correction in the multiplexing circuit 100. During the charging process of the first power supply 102, the corrected voltage is transformed by the transformer 110. The connection of capacitor C1 and inductor L1 is adjusted based on multiple transistors in the transformer 110 to achieve voltage boost or buck. The structure is simple and highly stable, avoiding the problem of incompatibility between the inverter 104 and the circuit when multiplexing, thus improving the stability of the control system and the safety of the first power supply 102.

[0058] In some embodiments, the controller determines the state of the first power supply 102 and generates a control signal (which may be referred to as a second control signal) based on the state of the first power supply 102, and sends it to switches S11, S12, S21, S22, and S23 (collectively referred to as the first group of switches) and switches S31, S32, S33, S41, and S42 (collectively referred to as the second group of switches). Switches S11, S12, S21, S22, and S23 are connected between the first power supply 102 and the motor 106, while switches S31, S32, S33, S41, and S42 are connected between the first power supply 102 and the second power supply 108.

[0059] In some embodiments, the vehicle includes a Battery Management System (BMS) for monitoring and managing the first power source 102. The BMS can monitor electrical parameters of the first power source 102, such as voltage, temperature, current, remaining charge, and health status, and switch the state of the first power source 102 based on these electrical parameters. The battery management system can determine the state of the first power source 102 and adjust its connection method based on monitored electrical parameters. For example, when the vehicle is detected to be in a power output phase, the system controls the circuit between the first power source 102 and the motor 106 to power the motor 106; when the vehicle is detected to be still moving but without power output, the system controls the circuit between the motor 106 and the first power source 102 to recover the kinetic energy of the motor 106; when the first power source 102 needs to be charged and the socket 114 is already connected to the second power source 108, the system controls the circuit between the first power source 102 and the second power source 108 to charge the first power source 102; when the vehicle is detected to have connected an external device, the system controls the circuit between the first power source 102 and the external device to power the external device.

[0060] If the first power source 102 is in a charging state, receiving electrical energy from the second power source 108, the controller controls switches S11, S12, S21, S22, and S23 (collectively referred to as the first set of switches) to open, and controls switches S31, S32, S33, S41, and S42 to close. If the first power source 102 is in a discharging state, supplying electrical energy to the motor 106, the controller controls switches S11, S12, S21, S22, and S23 to close, and controls switches S31, S32, S33, S41, and S42 to open. Through this control method, the circuit switching of the inverter 104 can be achieved based on the controller's control of the two sets of switches.

[0061] In some embodiments, switch S1 is connected between the first power supply 102 and the inverter 104, switch S2 is connected between the inverter 104 and the motor 106, switch S3 is connected between the second power supply 108 and the inverter 104, and switch S4 is connected between the first power supply 102 and the transformer 110. When the controller determines that the first power supply 102 is in a state of discharging to external devices, the controller controls switches S1 and S3 to close and switches S2 and S4 to open via control signals. When the controller determines that the first power supply 102 needs to obtain recovered electrical energy from the motor 106, the controller controls switches S2 and S4 to close and switches S1 and S3 to open via control signals. In this way, the function of circuit 100 can be quickly switched by the controller controlling the on / off state of switches S1-S4.

[0062] From the teachings given in the foregoing description and related drawings, many modifications and other embodiments of the present disclosure will become apparent to those skilled in the art. Therefore, it is to be understood that embodiments of the present disclosure are not limited to the specific embodiments disclosed, and modifications and other embodiments are intended to be included within the scope of this disclosure. Furthermore, although the foregoing description and related drawings have described exemplary embodiments in the context of certain example combinations of components and / or functions, it should be appreciated that different combinations of components and / or functions may be provided by alternative embodiments without departing from the scope of this disclosure. In this regard, for example, other combinations of components and / or functions that differ from those explicitly described above are also contemplated within the scope of this disclosure. Although specific terms are used herein, they are used in a general and descriptive sense only and are not intended to be limiting.

[0063] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A multiplexing circuit (100) for an inverter, comprising: The inverter (104) is configured to connect the vehicle’s first power supply (102) to the motor (106), or to connect the first power supply (102) to the second power supply (108); as well as The transformer (110) is configured to connect the first power supply (102) and the inverter (104) when the inverter (104) is connected to the first power supply (102) and the second power supply (108).

2. The circuit (100) according to claim 1, wherein the transformer (110) comprises: A first set of transistors, a first capacitor (C1), and a first inductor (L1), wherein the first capacitor (C1) is connected in parallel with the first power supply (102), the first set of transistors is configured to connect the inverter (104) and the first capacitor (C1) to a first discharge circuit of the first inductor (L1) when the transformer (110) steps up, or to connect the first capacitor (C1) to a second discharge circuit of the first inductor (L1) and disconnect the inverter (104) from the first inductor (L1) when the transformer (110) steps down.

3. The circuit (100) according to claim 2, wherein the first group of transistors comprises: A first transistor (Q1) and a second transistor (Q2), wherein the inverter (104), the first transistor (Q1), and the second transistor (Q2) are connected to form a loop, and the first capacitor (C1) and the first inductor (L1) are connected in series and then in parallel with the second transistor (Q2); and During the first charging phase of the first inductor (L1), the first transistor (Q1) is turned on and the second transistor (Q2) is turned off. During the first discharging phase of the first inductor (L1), the first transistor (Q1) is turned off and the second transistor (Q2) is turned on. The first charging phase and the first discharging phase form a buck cycle.

4. The circuit (100) according to claim 3, wherein the first group of transistors further comprises: The third transistor (Q3) and the fourth transistor (Q4) are connected to form a loop, wherein the inverter (104), the first inductor (L1) and the fourth transistor (Q4) are connected in series and then connected in parallel with the fourth transistor (Q4). as well as During the second charging phase of the first inductor (L1), the fourth transistor (Q4) is turned on. During the second discharging phase of the first inductor (L1), the third transistor (Q3) is turned on and the fourth transistor (Q4) is turned off. The second charging phase and the second discharging phase form a boost cycle.

5. The circuit (100) according to claim 4, wherein: The first terminal of the first inductor (L1) is connected to the first transistor (Q1) and the second transistor (Q2), and the second terminal is connected to the third transistor (Q3) and the fourth transistor (Q4); When the transformer (110) steps down the voltage, the third transistor (Q3) is turned on and the fourth transistor (Q4) is turned off; and When the transformer (110) boosts the voltage, the first transistor (Q1) is turned on and the second transistor (Q2) is turned off.

6. The circuit (100) according to claim 1, wherein the inverter (104) comprises: A second capacitor (C2) and a third capacitor (C3), wherein the second capacitor (C2) and the third capacitor (C3) are connected in series and then connected in parallel with the first power supply (102); and The second group of transistors includes a fifth transistor (Q5), a sixth transistor (Q6), a seventh transistor (Q7), and an eighth transistor (Q8). The first terminal of the fifth transistor (Q5) is connected between the second capacitor (C2) and the third capacitor (C3), and the second terminal is connected to the first terminal of the sixth transistor (Q6) and forms a back connection with the sixth transistor (Q6). The second terminal of the sixth transistor (Q6) is connected between the seventh transistor (Q7) and the eighth transistor (Q8). The sixth transistor (Q6), the seventh transistor (Q7), and the eighth transistor (Q8) are all connected to one input terminal of the motor (106).

7. The circuit (100) according to claim 6, wherein the inverter (104) further comprises: A second inductor (L2), connected between the second set of transistors and the motor (106), is configured to adjust the instantaneous current flowing into the motor (106) from the second set of transistors.

8. The circuit (100) according to claim 1 further includes: The first set of switches is connected between the first power source (102) and the motor (106); The second set of switches is connected between the first power source (102) and the second power source (108); as well as When the first set of switches is on and the second set of switches is off, the inverter (104) is connected to the first power supply (102) and the motor (106). When the first set of switches is off and the second set of switches is on, the inverter (104) is connected to the first power supply (102) and the second power supply (108).

9. The circuit (100) according to claim 8, wherein the first set of switches comprises: A first switch (S1) is connected between the first power supply (102) and the inverter (104); as well as At least three second switches (S2) are connected between the inverter (104) and the motor (106), and the number of the second switches (S2) that are turned on is determined based on the number of input terminals of the motor (106).

10. The circuit (100) according to claim 9, wherein the second set of switches comprises: At least three third switches (S3) are connected between the second power supply (108) and the inverter (104), the number of third switches (S3) being turned on being determined based on the number of output terminals of the second power supply (108); and A fourth switch (S4) is connected between the transformer (110) and the first power source (102).

11. The circuit (100) according to claim 10, wherein: When the first switch (S1) and the third switch (S3) are turned on and the second switch (S2) and the fourth switch (S4) are turned off, the inverter (104) is also configured to invert the current output by the first power supply (102) so that the inverted current is adapted to external devices. as well as When the second switch (S2) and the fourth switch (S4) are turned on and the first switch (S1) and the third switch (S3) are turned off, the inverter (104) is also configured to correct the power output of the motor (106), and the transformer (106) is also configured to transform the voltage corrected by the inverter (104) to obtain a voltage adapted to the first power supply (102).

12. A method for multiplexing an inverter (800), comprising: The inverter (104) is controlled to connect between the vehicle's first power supply (102) and the motor (106), or between the first power supply (102) and the second power supply (108); and When the inverter (104) is connected to the first power supply (102) and the second power supply (108), the control transformer (110) is connected to the first power supply (102) and the inverter (104).

13. The reuse method (800) according to claim 12 further includes: When the inverter (104) is connected between the first power supply (102) and the second power supply (108), the state of the transformer (110) is determined (802), the state of the transformer (110) including a step-up state and a step-down state; Based on the state of the transformer (110), a first control signal is generated (804) for a set of transistors in the transformer (110); as well as The first control signal is sent (806) to the group of transistors to control the transformer (110) to connect the inverter (104) and the first capacitor (C1) to the first discharge circuit of the first inductor (L1) when the transformer (110) is boosted, or to control the transformer (110) to connect the first capacitor (C1) to the second discharge circuit of the first inductor (L1) and disconnect the inverter (104) from the first inductor (L1) when the transformer (110) is bucked, wherein the first capacitor (C1) is connected in parallel with the first power supply (102).

14. The method (800) according to claim 12, further comprising: Determine the state of the first power supply (102); Based on the state of the first power supply (102), a second control signal is generated for the first set of switches and the second set of switches, wherein the first set of switches is connected between the first power supply (102) and the motor (106), and the second set of switches is connected between the first power supply (102) and the second power supply (108). as well as Send the second control signal to the first group of switches and the second group of switches to control the first group of switches to be turned on and the second group of switches to be turned off, or to control the first group of switches to be turned off and the second group of switches to be turned on.

15. The method (800) according to claim 13, wherein the first set of switches includes a first switch (S1) connected between the first power source (102) and the inverter (104) and a second switch (S2) connected between the inverter (104) and the motor (106), the second set of switches includes a third switch (S3) connected between the second power source (108) and the inverter (104) and a fourth switch (S4) connected between the transformer (110) and the first power source (102), and the second control signal is further used to control the first switch (S1), the second switch (S2), the third switch (S3), and the fourth switch (S4) to one of the following states: The first switch (S1) and the second switch (S2) are turned on, and the third switch (S3) and the fourth switch (S4) are turned off; The first switch (S1) and the second switch (S2) are turned off, and the third switch (S3) and the fourth switch (S4) are turned off; The first switch (S1) and the third switch (S3) are turned on, and the second switch (S2) and the fourth switch (S4) are turned off; or The first switch (S1) and the third switch (S3) are turned off, and the second switch (S2) and the fourth switch (S4) are turned on.

16. A controller, comprising: At least one processor; as well as A memory coupled to the at least one processor and having instructions stored thereon, which, when executed by the at least one processor, cause the controller to perform the method (800) according to any one of claims 12 to 15.

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