Three-phase charging drive integrated electric vehicle controller

Abstract

The application discloses a kind of three-phase charging drive integration electric vehicle controller, belong to electric vehicle charging technical field, make full use of electric vehicle motor drive circuit, realize charging drive integration under the condition of not increasing active switching device, electric vehicle controller includes three-phase asymmetric half-bridge motor drive circuit, three-phase mains rectifier circuit, the three-phase battery charging circuit of electric vehicle controller multiplexes the first phase circuit, second phase circuit, third phase circuit of three-phase asymmetric half-bridge motor drive circuit.In the application, electric vehicle controller utilizes three-phase mains rectification as the system input under charging mode, multiplex motor drive circuit realizes the charging of battery, does not need additional charger, integrates charger and driver.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle charging technology, specifically relating to a three-phase charging drive integrated electric vehicle controller. Background Technology

[0002] With the increasing popularity of electric vehicles, miniaturization, lightweighting, and low cost of their power electronic systems have become core requirements. In traditional electric vehicle designs, the drive inverter and on-board charger are typically separate structures, meaning they are completely independent hardware systems. This design has several drawbacks: firstly, high hardware redundancy leads to a large overall system size, increasing the vehicle's weight and hindering the development of lightweight electric vehicles; secondly, high costs increase the operating costs for consumers, limiting the market penetration of electric vehicles. Furthermore, reduced component utilization further impacts the performance and reliability of electric vehicles.

[0003] While existing integrated solutions using multiplexed drive topologies attempt to address the aforementioned issues to some extent, they still exhibit significant shortcomings in practical applications. Unlike existing solutions, this patent fully utilizes a three-phase asymmetrical half-bridge motor drive circuit. Using three-phase rectified mains power as input, it charges the battery through three asymmetrical half-bridges and three-phase windings. This achieves integrated charging and driving of electric vehicles without adding active switching devices, meeting the low-cost and lightweight requirements of modern electric vehicles. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a three-phase charging and driving integrated electric vehicle controller. This controller achieves integrated charging and driving of electric vehicles without adding active switching devices, thus solving the problem of failing to meet the demands of modern electric vehicles for miniaturization, low cost, and high performance.

[0005] To address the problem that existing technologies cannot meet the demands of modern electric vehicles for miniaturization, low cost, and high performance without adding active switching devices, we propose a three-phase charging and driving integrated electric vehicle controller. In short, it includes a three-phase asymmetrical half-bridge motor drive circuit and a three-phase mains rectifier circuit. The three-phase battery charging circuit of the electric vehicle controller reuses the first, second, and third phases of the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is electrically connected to the three-phase asymmetrical half-bridge motor drive circuit and provides the system input for the three-phase battery charging circuit in charging mode. The three-phase battery charging circuit dynamically adjusts the duty cycle of the switching transistors in the three-phase asymmetrical half-bridge motor drive circuit based on the battery's voltage and current state to achieve charging control. In this embodiment, the electric vehicle controller uses the three-phase mains rectification as the system input in charging mode, reuses the motor drive circuit, and achieves battery charging without requiring an additional charger, integrating the charger and driver into one unit.

[0006] This invention is implemented as follows: a three-phase charging and driving integrated electric vehicle controller includes a three-phase asymmetrical half-bridge motor drive circuit and a three-phase mains rectifier circuit. The three-phase battery charging circuit of the electric vehicle controller reuses the first phase, second phase, and third phase circuits of the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is electrically connected to the three-phase asymmetrical half-bridge motor drive circuit and provides system input in charging mode to the three-phase battery charging circuit. The three-phase battery charging circuit dynamically adjusts the duty cycle of the switching transistors of the three-phase asymmetrical half-bridge motor drive circuit during charging based on the voltage and current state of the battery to achieve charging control.

[0007] Preferably, the three-phase asymmetrical half-bridge motor drive circuit includes a battery US, a first-phase circuit, a second-phase circuit, and a third-phase circuit; The first phase circuit includes a three-phase motor winding L1, switching transistors Q1 and Q2, diodes D1 and D2. The positive terminal of the battery US is connected to the drain of switching transistor Q1 and the cathode of diode D2. The source of switching transistor Q1 is connected to the cathode of diode D1 and one end of the three-phase motor winding L1. The other end of the three-phase motor winding L1 is electrically connected to the anode of diode D2 and the drain of switching transistor Q2. The source of switching transistor Q2 and the anode of diode D1 are connected back to the negative terminal of the battery US. The second phase circuit includes a three-phase motor winding L2, a switching transistor Q3, a switching transistor Q4, a diode D3, and a diode D4, while the third phase circuit includes a three-phase motor winding L3, a switching transistor Q5, a switching transistor Q6, a diode D5, and a diode D6.

[0008] Preferably, the three-phase AC rectifier circuit includes a transformer and a rectifier bridge. The three-phase AC rectifier circuit is used to convert the three-phase AC power into DC power with a voltage lower than that of the battery US through transformer rectification, so as to act as a DC power source for the three-phase battery charging circuit. The three-phase AC power includes a first phase AC power Ua, a second phase AC power Ub, and a third phase AC power Uc.

[0009] Preferably, when the three-phase battery charging circuit of the electric vehicle controller reuses the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit, the mains rectified input is applied to the series branch of the motor winding inductance and the switching transistor of the second bridge arm of any phase of the three-phase asymmetrical half-bridge motor drive circuit to form a three-phase battery charging circuit, and the battery US is charged by controlling the switching transistor.

[0010] Preferably, the three-phase battery charging circuit further includes a three-phase mains rectifier input branch, a main power branch, and a charging control branch.

[0011] Preferably, the mains power rectifier input branch transforms the three-phase AC power through a transformer, and then rectifies it into DC power lower than the battery US voltage through a rectifier bridge. This DC power is then connected to the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit. Taking the first phase circuit as an example, in the first phase circuit, the positive terminal of the rectified DC power is connected to one end of the motor three-phase winding L1, the other end of the motor three-phase winding L1 is connected to the drain of the switch Q2 of the second bridge arm, and the negative terminal of the DC power is connected to the source of the switch Q2 and the negative terminal of the battery US to charge the battery US. The main power branch is used to connect the mains rectifier input branch and the battery US. Taking the first phase circuit as an example, in the first phase, the mains rectifier input branch is connected to one end of the motor three-phase winding L1, and the other end of the motor three-phase winding L1 is connected to the connection point between the drain of the switch Q2 and the anode of the diode D2 in the second bridge arm. The source of the switch Q2 is connected to the negative terminal of the battery US, and the cathode of the diode D2 is connected to the connection point between the positive terminal of the battery US, thus forming a battery charging circuit. The three phases thus form a three-phase battery charging circuit.

[0012] Preferably, the charging control branch dynamically adjusts the duty cycles of switches Q2, Q4, and Q6, and turns off switches Q1, Q3, and Q5 to achieve charging control.

[0013] Compared with the prior art, the embodiments of this application have the following main advantages: In this embodiment of the invention, the electric vehicle controller uses three-phase mains rectification as the system input in charging mode, reuses the motor drive circuit, and realizes the charging of the battery without the need for an additional charger, integrating the charger and driver into one unit.

[0014] In this embodiment of the invention, without adding active switching devices, the drive circuit of the electric vehicle is reused as a charging circuit, reducing hardware redundancy and thus achieving miniaturization and weight reduction of the power electronic system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the circuit principle of the three-phase charging and driving integrated electric vehicle controller provided by the present invention.

[0016] Figure 2 This is a schematic diagram of the circuit principle of the three-phase asymmetrical half-bridge motor drive circuit provided by the present invention.

[0017] Figure 3 The diagram illustrates the charging control branch of the motor's three-phase winding L1 as a schematic diagram of the charging principle in an embodiment of the present invention.

[0018] Figure 4 This diagram illustrates the charging control branch of the battery US in an embodiment of the present invention. Detailed Implementation

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0020] To address the problem that existing technologies cannot meet the demands of modern electric vehicles for miniaturization, low cost, and high performance without adding active switching devices, we propose a three-phase charging and driving integrated electric vehicle controller. In short, it includes a three-phase asymmetrical half-bridge motor drive circuit and a three-phase mains rectifier circuit. The three-phase battery charging circuit of the electric vehicle controller reuses the first, second, and third phases of the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is electrically connected to the three-phase asymmetrical half-bridge motor drive circuit and provides the system input for the three-phase battery charging circuit in charging mode. The three-phase battery charging circuit dynamically adjusts the duty cycle of the switching transistors in the three-phase asymmetrical half-bridge motor drive circuit based on the battery's voltage and current state to achieve charging control. In this embodiment, the electric vehicle controller uses the three-phase mains rectification as the system input in charging mode, reuses the motor drive circuit, and achieves battery charging without requiring an additional charger, integrating the charger and driver into one unit.

[0021] This invention provides a three-phase charging and driving integrated electric vehicle controller, such as... Figure 1 As shown, the three-phase charging and driving integrated electric vehicle controller includes a three-phase asymmetrical half-bridge motor drive circuit and a three-phase mains rectifier circuit. The three-phase battery charging circuit of the electric vehicle controller reuses the first phase, second phase, and third phase circuits of the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is electrically connected to the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit provides system input in charging mode to the three-phase battery charging circuit. The three-phase battery charging circuit dynamically adjusts the duty cycle of the switching transistors of the three-phase asymmetrical half-bridge circuit during charging based on the voltage and current state of the battery to achieve charging control.

[0022] In this embodiment, as Figure 2 As shown, the three-phase asymmetrical half-bridge motor drive circuit includes a battery US, a first-phase circuit, a second-phase circuit, and a third-phase circuit; The first phase circuit includes a three-phase motor winding L1, switching transistors Q1 and Q2, diodes D1 and D2. The positive terminal of the battery US is connected to the drain of switching transistor Q1 and the cathode of diode D2. The source of switching transistor Q1 is connected to the cathode of diode D1 and one end of the three-phase motor winding L1. The other end of the three-phase motor winding L1 is electrically connected to the anode of diode D2 and the drain of switching transistor Q2. The source of switching transistor Q2 and the anode of diode D1 are connected back to the negative terminal of the battery US. The second phase circuit includes a three-phase motor winding L2, a switching transistor Q3, a switching transistor Q4, a diode D3, and a diode D4, while the third phase circuit includes a three-phase motor winding L3, a switching transistor Q5, a switching transistor Q6, a diode D5, and a diode D6. The circuit principles of the second and third phase circuits are similar to those of the first phase circuit, and will not be described in detail here.

[0023] In this embodiment of the invention, the electric vehicle controller uses three-phase mains rectification as the system input in charging mode, reuses the motor drive circuit, and realizes the charging of the battery without the need for an additional charger, integrating the charger and driver into one unit.

[0024] In this embodiment of the invention, the three-phase mains rectifier circuit includes a transformer and a rectifier bridge. The three-phase mains rectifier circuit is used to convert the three-phase AC power into DC power that is lower than the battery voltage US through transformer rectification, so as to provide the system input in charging mode for the three-phase battery charging circuit. The three-phase AC power includes the first phase AC power Ua, the second phase AC power Ub, and the third phase AC power Uc.

[0025] When the three-phase battery charging circuit of the electric vehicle controller reuses the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit, the mains rectified input is applied to the series branch of the motor winding inductance and the switching transistor of the second bridge arm of any phase of the three-phase asymmetrical half-bridge motor drive circuit to form a three-phase symmetrical structure three-phase battery charging circuit, and the battery US is charged by controlling the switching transistor.

[0026] In this embodiment of the invention, the three-phase battery charging circuit further includes a three-phase mains rectified input branch, a main power branch, and a charging control branch. The mains rectified input branch transforms the three-phase AC power through a transformer, then rectifies it into DC power lower than the battery's US voltage via a rectifier bridge. This DC power is connected to the first, second, and third phases of the three-phase asymmetrical half-bridge motor drive circuit. Taking the first phase circuit as an example, in the first phase, the positive terminal of the rectified DC power is connected to one end of the motor's three-phase winding L1, and the other end of L1 is connected to the drain of the switching transistor Q2 in the second bridge arm. The negative terminal of the DC power is connected to the source of the switching transistor Q2 and the negative terminal of the battery US, charging the battery US. The connection methods of the second and third phase circuits and the mains rectified input branch are the same as those of the first phase circuit.

[0027] It should be noted that the main power branch is used to connect the mains rectifier input branch and the battery US. Taking the first phase circuit as an example, the mains rectifier input branch is connected to one end of the motor three-phase winding L1, and the other end of the motor three-phase winding L1 is connected to the connection point between the drain of the switch Q2 and the anode of the diode D2 in the second bridge arm. The source of the switch Q2 is connected to the negative terminal of the battery US, and the cathode of the diode D2 is connected to the connection point between the positive terminal of the battery US, thus forming a battery charging circuit. The three phases form a three-phase battery charging circuit. The main power branch formed by the second and third phase circuits is similar to that of the first phase circuit.

[0028] In this embodiment of the invention, the charging control branch dynamically adjusts the duty cycles of switches Q2, Q4, and Q6, and turns off switches Q1, Q3, and Q5 based on the state of the battery and the charging demand, thereby achieving charging control.

[0029] In a further preferred embodiment of the present invention, such as Figure 3 The diagram illustrates the charging control branch of the motor's three-phase winding L1 in this embodiment of the invention. Taking the first phase circuit containing the motor's three-phase winding L1 as an example, the other two phases are similar. When switch Q1 is off and switch Q2 is on, the mains power is rectified and converted into DC power lower than the battery's US voltage, which flows through the motor's three-phase winding L1. Switch Q2 forms the excitation circuit of the three-phase battery charging circuit, thereby charging the motor's three-phase winding L1.

[0030] In a further preferred embodiment of the present invention, such as Figure 4 The diagram illustrates the charging control branch of the present invention, specifically the charging principle of the battery US. Taking the first phase circuit containing the motor's three-phase winding L1 as an example, the other two phases are similar. When switch Q1 is turned off and switch Q2 is closed, the mains power, after being rectified, becomes DC power lower than the battery US voltage. This DC power is connected in series with the previously charged motor three-phase winding L1 and flows through diode D2 to form the charging circuit for the battery US, thus charging the battery US.

[0031] In summary, the present invention provides a three-phase charging and driving integrated electric vehicle controller. In the embodiments of the present invention, the electric vehicle controller uses three-phase mains rectification as the system input in charging mode, reuses the motor drive circuit, and realizes the charging of the battery without the need for an additional charger, thus integrating the charger and driver into one unit.

[0032] In this embodiment of the invention, the drive circuit of the electric vehicle is reused as a charging circuit without adding active switching devices, thereby reducing hardware redundancy and realizing the miniaturization and weight reduction of the power electronic system.

[0033] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A three-phase charging and driving integrated electric vehicle controller, characterized in that, The system includes a three-phase asymmetrical half-bridge motor drive circuit and a three-phase mains rectifier circuit. The three-phase battery charging circuit of the electric vehicle controller reuses the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is electrically connected to the three-phase asymmetrical half-bridge motor drive circuit. The three-phase mains rectifier circuit is used to provide system input in charging mode to the three-phase battery charging circuit. The three-phase battery charging circuit dynamically adjusts the duty cycle of the switching transistors of the three-phase asymmetrical half-bridge motor drive circuit during charging based on the voltage and current state of the battery to achieve charging control. The three-phase battery charging circuit also includes a three-phase mains rectifier input branch, a main power branch, and a charging control branch. The three-phase asymmetrical half-bridge motor drive circuit includes a battery US, a first-phase circuit, a second-phase circuit, and a third-phase circuit. The first phase circuit includes a three-phase motor winding L1, a switching transistor Q1, a switching transistor Q2, a diode D1, and a diode D2. The positive terminal of the battery US is connected to the drain of the switching transistor Q1 and the cathode of the diode D2. The source of the switching transistor Q1 is connected to the cathode of the diode D1 and one end of the three-phase motor winding L1. The other end of the three-phase motor winding L1 is electrically connected to the anode of the diode D2 and the drain of the switching transistor Q2. The source of the switching transistor Q2 and the anode of the diode D1 are connected back to the negative terminal of the battery US. The second phase circuit includes a three-phase motor winding L2, a switching transistor Q3, a switching transistor Q4, a diode D3, and a diode D4, while the third phase circuit includes a three-phase motor winding L3, a switching transistor Q5, a switching transistor Q6, a diode D5, and a diode D6. The three-phase AC rectifier circuit includes a transformer and a rectifier bridge. The three-phase AC rectifier circuit is used to convert the three-phase AC power into DC power lower than the battery voltage US through transformer rectification, and to provide the system input in charging mode for the three-phase battery charging circuit. The three-phase AC power includes the first phase AC power Ua, the second phase AC power Ub, and the third phase AC power Uc. The charging control branch dynamically adjusts the duty cycles of switches Q2, Q4, and Q6, and turns off switches Q1, Q3, and Q5 based on the battery's state and charging requirements, thereby achieving charging control. In the first phase, the rectified DC positive terminal is connected to one end of the motor three-phase winding L1, the other end of the motor three-phase winding L1 is connected to the drain of the switch Q2 of the second bridge arm, and the DC negative terminal is connected to the source of the switch Q2 and the negative terminal of the battery US to charge the battery US.

2. The three-phase charging and driving integrated electric vehicle controller as described in claim 1, characterized in that: When the three-phase battery charging circuit of the electric vehicle controller reuses the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit, the mains rectified input is applied to the series branch of the motor winding inductance and the switching transistor of the second bridge arm of any phase of the three-phase asymmetrical half-bridge motor drive circuit to form a three-phase symmetrical structure three-phase battery charging circuit, and the battery US is charged by controlling the switching transistor.

3. The three-phase charging and driving integrated electric vehicle controller as described in claim 2, characterized in that: The mains power rectifier input branch transforms the three-phase AC power through a transformer, and then rectifies it into DC power lower than the battery US voltage through a rectifier bridge. This DC power is then connected to the first phase circuit, the second phase circuit, and the third phase circuit of the three-phase asymmetrical half-bridge motor drive circuit.

Images