Energy processing devices and vehicles

Abstract

This disclosure relates to an energy processing device and a vehicle. The device includes a battery, a first boost inductor, a multi-phase first bridge arm, a multi-phase motor winding, an energy storage element, and a controller. A first end of each phase motor winding is connected to the midpoint of the corresponding first bridge arm, and the second end of each phase motor winding is shared. A first end of each phase first bridge arm is connected to a first end of the energy storage element, and a second end of each phase first bridge arm is connected to the second end of the energy storage element and the negative terminal of the battery. A first end of the first boost inductor is connected to the positive terminal of the battery, and a second end of the first boost inductor is connected to the midpoint of a first target bridge arm, wherein the first target bridge arm is any one of the first bridge arms. The controller is connected to each phase first bridge arm and is configured to control the first bridge arm. Thus, based on the control of the first bridge arm, motor drive and voltage boost are simultaneously achieved, improving the integration level of the high-voltage system of the electric vehicle.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more specifically, to an energy processing device and a vehicle. Background Technology

[0002] With the advancement of electrification, higher requirements are being placed on the high-voltage systems of electric vehicles, especially in terms of motor and electronic control. In order to match higher speeds, a higher voltage platform is often required.

[0003] To increase the voltage level, the battery cells can be directly stacked in series. However, this method increases the overall vehicle size and cost. Alternatively, a boost circuit can be added between the battery and the load to raise the voltage level of the low-voltage battery pack. A typical boost circuit requires at least one boost inductor and a boost bridge arm. The addition of the boost circuit also increases the overall vehicle size and cost. Summary of the Invention

[0004] The purpose of this disclosure is to provide an energy processing device and vehicle to improve the integration of the high-voltage system of an electric vehicle, while simultaneously achieving voltage boosting and motor drive.

[0005] To achieve the above objectives, the first aspect of this disclosure provides an energy processing device, including a battery, a first boost inductor, a multiphase first bridge arm, a multiphase motor winding, an energy storage element, and a controller.

[0006] The first end of each phase motor winding is connected to the midpoint of the corresponding first bridge arm, and the second end of each phase motor winding is connected together; the first end of each phase first bridge arm is connected to the first end of the energy storage element, and the second end of each phase first bridge arm is connected to the second end of the energy storage element and the negative terminal of the battery.

[0007] The first terminal of the first boost inductor is connected to the positive terminal of the battery, and the second terminal of the first boost inductor is connected to the midpoint of the first target bridge arm, wherein the first target bridge arm is any one of the first bridge arms;

[0008] The controller is connected to the first bridge arm of each phase and is configured to control the first bridge arm to achieve voltage boost and motor drive through the first target bridge arm.

[0009] Optionally, the controller is configured to:

[0010] The voltage across the energy storage element and the time elapsed between the last on / off state switch of the upper and lower arms of the first bridge arm are obtained.

[0011] The switching of the on / off states of the upper and lower arms of the first bridge arm is controlled according to the voltage or the duration.

[0012] Optionally, the controller is configured to:

[0013] In response to determining that the voltage or the duration meets a first preset condition, the lower bridge arm of the first target bridge arm is turned on and the upper bridge arm is turned off, so that the battery charges the first boost inductor and the energy storage element releases energy to the motor winding.

[0014] In response to determining that the voltage or the duration meets a second preset condition, the lower bridge arm of the first target bridge arm is controlled to turn off, so that the battery and the first boost inductor charge the energy storage element and release energy to the motor winding.

[0015] Optionally, the controller is configured to determine that a first preset condition is met by:

[0016] If the voltage increases to the first target voltage, or the duration of the lower arm of the first target bridge arm being turned off reaches the maximum allowable duration, then the first preset condition is determined to be met.

[0017] Optionally, the controller is configured to determine that a second preset condition is met by:

[0018] If the voltage decreases to the second target voltage, or the duration of conduction of the lower arm of the first target bridge arm reaches the maximum allowable duration, then the second preset condition is determined to be met.

[0019] Optionally, the device further includes at least one phase of second boost inductor and at least one phase of second bridge arm.

[0020] The first terminal of each phase second boost inductor is connected to the positive terminal of the battery, and the second terminal of each phase second boost inductor is connected to the midpoint of the corresponding second bridge arm, wherein the number of second boost inductors and second bridge arms is the same;

[0021] The first end of the second bridge arm is connected to the first end of the energy storage element, and the second end of the second bridge arm is connected to the second end of the energy storage element and the negative terminal of the battery.

[0022] The controller is connected to each phase second bridge arm and is configured to control the second bridge arm to achieve voltage boost through the second bridge arm.

[0023] Optionally, the controller is configured to:

[0024] The voltage across the energy storage element and the time elapsed since the last on / off state switch of the upper and lower arms of the first bridge arm and the upper and lower arms of the second bridge arm are obtained.

[0025] Based on the voltage or the duration, control the switching of the on / off states of the upper and lower bridge arms of the first and second bridge arms.

[0026] Optionally, the controller is configured to:

[0027] In response to determining that the voltage or the duration meets a third preset condition, the lower bridge arm of the first target bridge arm and the upper bridge arm of the second bridge arm are controlled to be turned on and turned off, so that the battery charges the first boost inductor and the second boost inductor, and the energy storage element releases energy to the motor winding.

[0028] In response to determining that the voltage or the duration meets a fourth preset condition, the lower bridge arm of the first target bridge arm and the second bridge arm is controlled to turn off, so that the battery, the first boost inductor and the second boost inductor charge the energy storage element and release energy to the motor winding.

[0029] Optionally, the controller is configured to determine that a third preset condition is met by:

[0030] If the voltage increases to the first target voltage, or the duration of the lower arm turn-off of the first target bridge arm and the second bridge arm reaches the maximum allowable duration, then the third preset condition is determined to be satisfied.

[0031] Optionally, the controller is configured to determine that a fourth preset condition is met by:

[0032] If the voltage decreases to the second target voltage, or the duration for which the lower arm of the first target bridge arm and the second bridge arm are turned on reaches the maximum allowable duration, then the fourth preset condition is determined to be satisfied.

[0033] Optionally, the controller is configured to:

[0034] In response to determining that the duration meets the fifth preset condition, the lower bridge arm of the second bridge arm is turned on and the upper bridge arm is turned off, and the lower bridge arm of the first target bridge arm is turned off, so that the battery charges the second boost inductor, and the first boost inductor and the battery charge the energy storage element and release energy to the motor winding.

[0035] In response to determining that the duration meets the sixth preset condition, the lower bridge arm of the second bridge arm is turned off, the lower bridge arm of the first target bridge arm is turned on, and the upper bridge arm is turned off, so that the battery charges the first boost inductor, the second boost inductor and the battery charge the energy storage element and release energy to the motor winding.

[0036] Optionally, the controller is configured to determine that a fifth preset condition is met by:

[0037] If the lower arm of the second bridge arm is turned off and the conduction time of the lower arm of the first target bridge arm reaches the maximum allowable time, then the fifth preset condition is determined to be satisfied.

[0038] Optionally, the controller is configured to determine that a sixth preset condition is met by:

[0039] If the duration for which the lower arm of the second bridge arm is turned on and the duration for which the lower arm of the first target bridge arm is turned off reaches the maximum allowable duration, then the sixth preset condition is determined to be satisfied.

[0040] Optionally, the motor winding is the motor winding of the vehicle's drive motor.

[0041] Optionally, the energy storage element includes a capacitor.

[0042] A second aspect of this disclosure provides a vehicle including the energy processing device provided in the first aspect of this disclosure.

[0043] In the above technical solution, the energy processing device includes a battery, a first boost inductor, a multi-phase first bridge arm, a multi-phase motor winding, an energy storage element, and a controller. The first end of each phase motor winding is connected to the midpoint of the corresponding first bridge arm, and the second end of each phase motor winding is shared. The first end of each phase first bridge arm is connected to the first end of the energy storage element, and the second end of each phase first bridge arm is connected to the second end of the energy storage element and the negative terminal of the battery. The first end of the first boost inductor is connected to the positive terminal of the battery, and the second end of the first boost inductor is connected to the midpoint of the first target bridge arm, wherein the first target bridge arm is any one of the first bridge arms. The controller is connected to each phase first bridge arm and is configured to control the first bridge arm. In this way, the first target bridge arm corresponding to the motor winding can be reused. Based on the controller's control of the first bridge arm, the first target bridge arm can not only achieve motor drive but also boost voltage, improving the integration level of the electric vehicle's high-voltage system, reducing the number of electrical components and wiring harnesses connecting these components in the electric vehicle's high-voltage system, and reducing the size and weight of the vehicle's high-voltage system.

[0044] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a block diagram illustrating an energy processing device according to an exemplary embodiment.

[0047] Figure 2 This is a circuit topology diagram of an energy processing device according to an exemplary embodiment.

[0048] Figure 3 This is a schematic diagram illustrating the working principle of an energy processing device when a first preset condition is met, according to an exemplary embodiment.

[0049] Figure 4 This is a schematic diagram illustrating the working principle of an energy processing device when a second preset condition is met, according to an exemplary embodiment.

[0050] Figure 5 This is a block diagram illustrating an energy processing device according to an exemplary embodiment.

[0051] Figure 6 This is a circuit topology diagram of an energy processing device according to an exemplary embodiment.

[0052] Figure 7 This is a schematic diagram illustrating the working principle of an energy processing device when a third preset condition is met, according to an exemplary embodiment.

[0053] Figure 8 This is a schematic diagram illustrating the working principle of an energy processing device when a fourth preset condition is met, according to an exemplary embodiment.

[0054] Figure 9 This is a schematic diagram illustrating the working principle of an energy processing device when a fifth preset condition is met, according to an exemplary embodiment.

[0055] Figure 10 This is a schematic diagram illustrating the working principle of an energy processing device when a sixth preset condition is met, according to an exemplary embodiment. Detailed Implementation

[0056] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0057] This disclosure provides an energy processing device, such as Figure 1 As shown, the energy processing device may include: a battery 1, a first boost inductor 2, a multiphase first bridge arm 3, a multiphase motor winding 4, an energy storage element 5, and a controller 6. The number of first bridge arms 3 and motor windings 4 are the same.

[0058] The first end of each phase motor winding 4 is connected to the midpoint of the corresponding first bridge arm 3, and the second end of each phase motor winding 4 is connected together; the first end of each phase first bridge arm 3 is connected to the first end of the energy storage element 5, and the second end of each phase first bridge arm 3 is connected to the second end of the energy storage element 5 and the negative terminal of the battery 1.

[0059] The first end of the first boost inductor 2 is connected to the positive terminal of the battery 1, and the second end of the first boost inductor 2 is connected to the midpoint of the first target bridge arm, wherein the first target bridge arm is any one of the first bridge arms 3.

[0060] The controller 6 is connected to the first bridge arm 3 of each phase, and the controller 6 is configured to control the first bridge arm 3 to achieve boost voltage and motor drive through the first target bridge arm.

[0061] For example, battery 1 can be a power battery in a vehicle, which may include multiple batteries connected in series, without limitation. Motor winding 4 can be the motor winding of the vehicle's drive motor, and energy storage element 5 may include a capacitor. The bridge arm in this disclosure is a circuit structure in which two power devices are connected in the form of a totem pole, with the midpoint as the output. Each bridge arm includes one power device in the upper arm and another power device in the lower arm. The power devices involved in this disclosure can be any one of a silicon controlled rectifier (SCR), a MOSFET (Metal-O-Semiconductor Field-Effect Transistor), or an IGBT (Insulated-Gate Bipolar Transistor). To avoid damage to the power devices from reverse voltage, each power device can be connected in reverse parallel with a parasitic diode and used as the upper or lower bridge arm. This parasitic diode will be referred to as the anti-parallel diode below.

[0062] The controller 6 can control the on / off state of the upper and lower bridge arms of the first bridge arm 3 to achieve voltage boosting. For example, it can control the upper bridge arm of the first target bridge arm to be off and the lower bridge arm to be on, so that the battery 1 charges the first boost inductor 2, thereby achieving voltage boosting. The controller 6 can also control the on / off state of the upper and lower bridge arms of the first bridge arm 3 to achieve motor drive. For example, it can control the upper bridge arm of at least one phase of the first bridge arm 3 to be on, thereby achieving motor drive.

[0063] By designing a new circuit topology between battery 1, first boost inductor 2, multi-phase first bridge arm 3, multi-phase motor winding 4, and energy storage element 5, the bridge arm corresponding to any phase of motor winding 4 (i.e., the first target bridge arm) is reused. Thus, under the control of controller 6, the first target bridge arm can not only control the motor drive where motor winding 4 is located, but also achieve voltage boosting. Compared to adding a boost circuit including at least one phase boost inductor and boost bridge arm between battery 1 and load (such as drive motor) in the electric vehicle high-voltage system, or directly stacking battery cells in series, this effectively improves the integration level of the electric vehicle high-voltage system. While reducing the number of electrical components in the electric vehicle high-voltage system, it ensures the normal operation of the load in the electric vehicle high-voltage system. The reduction in electrical components (power devices) also reduces the number of wiring harnesses and connectors used to connect electrical components, thus reducing the probability of failure in the electric vehicle high-voltage system to some extent. On the other hand, it can effectively reduce the size and weight of the electric vehicle high-voltage system, thereby improving the transportation capacity and space utilization of electric vehicles to a certain extent.

[0064] Figure 2 This is a circuit topology diagram of an energy processing device according to an exemplary embodiment. Figure 2 As shown (controller 6 in) Figure 2 (Not shown in the image), the energy processing device includes a three-phase first bridge arm 3 and a three-phase motor winding 4. Each phase first bridge arm 3 corresponds to one phase motor winding 4. For example... Figure 2 As shown, the motor winding 4 may include a phase A winding, a phase B winding, and a phase C winding. Each phase motor winding 4 has its own first end and second end (in... Figure 2 In the planar orientation shown, the first end is the left end, and the second end is the right end. Specifically, the first end of phase A winding is used to connect to the midpoint of phase A bridge arm, the first end of phase B winding is used to connect to the midpoint of phase B bridge arm, and the first end of phase C winding is used to connect to the midpoint of phase C bridge arm. Furthermore, the second ends of phase A winding, phase B winding, and phase C winding are shared. Each phase's first bridge arm 3 has its own first end and second end (in...). Figure 2 In the planar direction shown, the first end is the upper end and the second end is the lower end. Among them, phase A bridge arm is the first target bridge arm, and the midpoint of phase A bridge arm is also connected to the positive terminal of battery 1 through the first boost inductor 2.

[0065] The energy processing device disclosed herein offers a variety of control strategies to choose from, namely, it provides the possibility of enabling the first target bridge arm to participate in charging the first boost inductor 2, and also the possibility of enabling the first target bridge arm to participate in providing energy for the motor drive. The controller 6 can perform corresponding strategy configurations based on the voltage across the actual energy storage element 5 and the on / off state of the upper and lower bridge arms of the first bridge arm 3, further enhancing the flexibility and practicality of the energy processing device.

[0066] correspond Figure 2 In an optional embodiment, controller 6 can be configured as follows:

[0067] The voltage across the energy storage element 5 and the time elapsed between the upper and lower arms of the first bridge arm 3 and the last on / off state switch are obtained.

[0068] The switching of the on / off state of the upper and lower bridge arms of the first bridge arm 3 is controlled according to voltage or duration.

[0069] The switching frequencies of the upper and lower bridge arms in the bridge arm can be preset, and the maximum allowable switching time of the upper and lower bridge arms can be determined based on these frequencies. Timing can begin when the upper and lower bridge arms of the first bridge arm 3 switch states (from on to off, or from off to on) to determine the time elapsed since the last switching state. The switching frequencies of the power devices in each phase bridge arm can be consistent, meaning the maximum allowable time for each power device can be consistent.

[0070] For example, when the voltage across the energy storage element 5 is greater than the first target voltage, it can be determined that the energy storage element 5 has completed charging and can be used to supply power to the load in the high-voltage system of the electric vehicle. At this time, the controller 6 can control the state switching of the upper and lower bridge arms in the first bridge arm 3, so that the energy storage element 5 releases energy to the motor winding 4 or other loads (such as compressors and PTC heating modules) connected to the energy storage element 5 in the high-voltage system of the electric vehicle.

[0071] For example, if the time elapsed between the last on / off state switch of the upper or lower arm of the first bridge arm 3 and the last on / off state switch reaches the maximum allowable time, in order to ensure the safe operation of the first bridge arm 3 and avoid excessive wear, the controller 6 can control the switching of the on / off state of the upper and lower arms of the first bridge arm 3.

[0072] Alternatively, controller 6 can be configured as follows:

[0073] In response to the determination that the voltage or duration meets the first preset condition, the lower bridge arm of the first target bridge arm is turned on and the upper bridge arm is turned off, so that the battery 1 charges the first boost inductor 2 and the energy storage element 5 releases energy to the motor winding 4.

[0074] In response to the determination that the voltage or duration meets the second preset condition, the lower bridge arm of the first target bridge arm is controlled to turn off, so that the battery 1 and the first boost inductor 2 charge the energy storage element 5 and release energy to the motor winding 4.

[0075] exist Figure 3Under the condition that the voltage or duration meets the first preset condition, the lower arm of the first target bridge arm (phase A bridge arm) is turned on and the upper arm is turned off. Current flows out from the positive terminal of battery 1, passes through the first boost inductor 2 and the lower arm of phase A bridge arm, and flows into the negative terminal of battery 1. In this way, battery 1 can charge (store energy) the first boost inductor 2. In addition, by controlling the duty cycle of the power device in the lower arm of phase A bridge arm, the magnitude of the charging current can be controlled, thereby controlling the magnitude of the charging power. At the same time, the number of power devices turned on and their duty cycles in phase B and phase C bridge arms can be controlled, so that the energy storage element 5 releases energy to the motor winding 4, and the magnitude of the discharge current of the energy storage element 5 can be controlled.

[0076] The controller 6 can be configured to determine whether the first preset condition is met by the following method: if the voltage increases to the first target voltage, or the duration of the lower arm of the first target arm being turned off reaches the maximum allowable duration, then the first preset condition is met.

[0077] For example, the first target voltage can be a preset threshold, or it can be a value determined in real time by PI regulation based on the voltage before and after boosting (battery voltage and boosted voltage obtained through the boost inductor). In the previous state that meets the first preset condition (i.e., the state that meets the second preset condition), the battery 1 and the first boost inductor 2 charge the energy storage element 5. The energy stored in the battery 1 and the first boost inductor 2 is continuously transferred to the energy storage element 5. The voltage across the energy storage element 5 increases continuously over time, while the energy stored in the first boost inductor 2 decreases.

[0078] If the voltage increases to the first target voltage, it can be determined that the energy storage element 5 has completed charging and can be used to supply power to the loads in the high-voltage system of the electric vehicle. At this time, it can be determined that the first preset condition is met, and the lower bridge arm of the first target bridge arm is controlled to be turned on and the upper bridge arm is turned off, so that the battery 1 charges the first boost inductor 2 and the energy storage element 5 releases energy to the motor winding 4. In addition, the energy storage element 5 can also release energy to other loads in the high-voltage system of the electric vehicle that are connected to the energy storage element 5.

[0079] Under the condition that the second preset condition is met, the on / off state of the upper bridge arm of the first target bridge arm and the power devices in the other phases of the first bridge arm 3 is not always uniquely fixed, but the lower bridge arm of the first target bridge arm is always off, and the maximum allowable duration for each power device is consistent. Once the lower bridge arm of the first target bridge arm is turned on, the controller 6 no longer corresponds to the second preset condition. Therefore, the satisfaction of the first preset condition can be determined based on the relationship between the off-duty duration of the lower bridge arm of the first target bridge arm and the maximum allowable duration. If the off-duty duration of the lower bridge arm of the first target bridge arm reaches the maximum allowable duration, it can be determined that the on / off state of the lower bridge arm of the first target bridge arm needs to be changed to avoid excessive losses and ensure its safe operation subsequently.

[0080] exist Figure 4 Under the condition that the voltage or duration meets the second preset condition, the lower arm of the first target bridge arm (phase A bridge arm) is turned off, while the upper arm can be turned off or turned on. If the upper arm of phase A bridge arm is turned off, current cannot be transmitted through the body of the power device. In this case, the circuit can be turned on through the anti-parallel diode of the power device. However, under the same conditions, the loss of the anti-parallel diode is much greater than that of the power device. Therefore, the power device can be turned on, that is, the upper arm of phase A bridge arm can be turned on, so that the current flows through the body of the power device to reduce the loss of electronic components. When the lower arm of phase A bridge arm is turned off, the current flows out from the positive terminal of battery 1, passes through the first boost inductor 2 and the upper arm of phase A bridge arm in sequence, and flows into the first terminal of energy storage element 5. Figure 4 From the upper end in the planar direction shown), and then from the second end of the energy storage element 5 ( Figure 4 The energy flows out from the lower end in the planar direction shown and into the negative terminal of battery 1. This process enables battery 1 and the first boost inductor 2 to charge the energy storage element 5. At the same time, the number of power devices and their duty cycle in phase B and phase C can be controlled to enable battery 1 and the first boost inductor 2 to provide energy to motor winding 4.

[0081] The controller 6 can be configured to determine whether the second preset condition is met by the following method: if the voltage decreases to the second target voltage, or the conduction time of the lower arm of the first target arm reaches the maximum allowable time, then the second preset condition is met.

[0082] For example, the second target voltage can be a preset threshold, or it can be a value determined in real time by PI control based on the voltage before and after boosting (battery voltage and boosted voltage obtained through the boost inductor). In the state before the second preset condition is met (i.e., in the state when the first preset condition is met), the battery 1 charges the first boost inductor 2, the energy storage element 5 releases energy to the motor winding 4, the energy in the first boost inductor 2 continuously increases, and the voltage across the energy storage element 5 continuously decreases over time.

[0083] If the voltage decreases to the second target voltage, it can be determined that the voltage across the energy storage element 5 is too low to continue releasing energy to the motor winding 4, and the energy storage element 5 needs to be charged. Energy can be released by the battery 1 and the first boost inductor 2 to the loads in the electric vehicle's high-voltage system (at least including the motor winding 4). At this time, it can be determined that the second preset condition is met, and the lower arm of the first target bridge arm is controlled to turn off, so that the battery 1 and the first boost inductor 2 can charge the energy storage element 5 and release energy to the motor winding 4. In addition, the battery 1 and the first boost inductor 2 can also release energy to other loads in the electric vehicle's high-voltage system.

[0084] Under the condition that the first preset condition is met, the on / off state of the power devices in the other phases of the first bridge arm 3 (excluding the first target bridge arm) is not always uniquely fixed. However, the lower bridge arm of the first target bridge arm is always on and the upper bridge arm is always off, and the maximum allowable duration for each power device is consistent. Once the lower bridge arm is off, the controller 6 no longer corresponds to the first preset condition. Therefore, the second preset condition can be determined based on the relationship between the on-time of the lower bridge arm of the first target bridge arm and the maximum allowable duration. If the on-time of the lower bridge arm of the first target bridge arm reaches the maximum allowable duration, it can be determined that the on / off state of the lower bridge arm of the first target bridge arm needs to be changed to avoid excessive losses and ensure its safe operation subsequently.

[0085] By alternating between satisfying the first preset condition and satisfying the second preset condition, voltage boosting can be achieved, while the motor can simultaneously perform inverter drive. The timing of the power devices' operation in achieving inverter drive and voltage boosting overlaps; therefore, these two functions can be coupled together.

[0086] Figure 5 This is a block diagram illustrating an energy processing apparatus according to an exemplary embodiment. Figure 5 As shown, in Figure 1 Based on this, the energy processing device provided in this disclosure further includes at least one phase second boost inductor 7 and at least one phase second bridge arm 8, wherein the number of second boost inductors 7 and second bridge arms 8 are the same.

[0087] The first terminal of each phase second boost inductor 7 is connected to the positive terminal of battery 1, and the second terminal of each phase second boost inductor 7 is connected to the midpoint of the corresponding second bridge arm 8.

[0088] The first end of the second bridge arm 8 is connected to the first end of the energy storage element 5, and the second end of the second bridge arm 8 is connected to the second end of the energy storage element 5 and the negative terminal of the battery 1.

[0089] The controller 6 is connected to the second bridge arm 8 of each phase, and the controller 6 is also configured to control the second bridge arm 8 to achieve voltage boost through the second bridge arm 8.

[0090] It should be noted that, although Figure 5 The illustration is based on an energy processing device that also includes a second phase bridge arm 8 and a second phase boost inductor 7. However, those skilled in the art should understand that... Figure 5 The number of the second bridge arm 8 and the number of the second boost inductor 7 are just examples. Figure 6 This is a circuit topology diagram of an energy processing device according to an exemplary embodiment. Figure 6 As shown, in Figure 2 Based on this, a second bridge arm 8 and a second boost inductor 7 were added. Figure 6In the planar orientation shown, the first end of the second boost inductor 7 is the left end, the second end of the second boost inductor 7 is the right end, the first end of the second bridge arm 8 is the upper end, and the second end of the second bridge arm 8 is the lower end. The second end of the second boost inductor 7 is connected to the midpoint of the second bridge arm 8.

[0091] Thus, by adding at least one phase of the second boost inductor 7 and at least one phase of the second bridge arm 8, the voltage level of the battery 1 can be further increased, while reducing the workload of the first boost inductor 2. Furthermore, the controller 6 can control the first bridge arm 3 and the second bridge arm 8 based on two different control modes: interleaved boost and non-interleaved boost. This allows the energy processing device provided in this disclosure to simultaneously achieve voltage boost and motor drive, further enhancing the flexibility and practicality of the energy processing device.

[0092] Controller 6 can be configured as follows:

[0093] The voltage across the energy storage element 5 and the time elapsed between the last on / off state switch of the upper and lower arms of the first bridge arm 3 and the upper and lower arms of the second bridge arm 8 are obtained.

[0094] Based on voltage or duration, control the switching of the on / off states of the upper and lower arms of the first bridge arm 3 and the second bridge arm 8.

[0095] The specific methods for obtaining voltage and duration have been described in detail in the previous embodiments and will not be elaborated upon here. The following section will detail the strategy configuration of controller 6 based on two different control methods: non-interleaved boost and interleaved boost.

[0096] Based on the non-interleaved boost configuration strategy, the voltage waveform across energy storage element 5 can be a periodic triangular wave. For the non-interleaved boost configuration strategy, controller 6 can be configured as follows:

[0097] In response to the determination that the voltage or duration meets the third preset condition, the lower bridge arm of the first target bridge arm and the upper bridge arm of the second bridge arm 8 are controlled to be turned on and the upper bridge arm is turned off, so that the battery 1 charges the first boost inductor 2 and the second boost inductor 7, and the energy storage element 5 releases energy to the motor winding 4.

[0098] In response to the determination that the voltage or duration meets the fourth preset condition, the lower bridge arm of the first target bridge arm and the second bridge arm 8 is controlled to turn off, so that the battery 1, the first boost inductor 2 and the second boost inductor 7 charge the energy storage element 5 and release energy to the motor winding 4.

[0099] exist Figure 7Under the condition that the voltage or duration meets the third preset condition, the lower arm of the second bridge arm 8 and the upper arm of the first target bridge arm (phase A bridge arm) are turned on and off. Current flows out from the positive terminal of battery 1, through the first boost inductor 2 and the lower arm of phase A bridge arm into the negative terminal of battery 1, and through the second boost inductor 7 and the lower arm of the second bridge arm 8 into the negative terminal of battery 1. In this way, battery 1 can charge (store energy) the first boost inductor 2 and the second boost inductor 7. In addition, by controlling the duty cycle of the power devices in the lower arms of phase A bridge arm and the second bridge arm 8, the magnitude of the charging current can be controlled, thereby controlling the magnitude of the charging power. At the same time, the number of power devices turned on and the duty cycle of each device in the B-phase bridge arm and the C-phase bridge arm can be controlled to enable the energy storage element 5 to release energy to the motor winding 4, and the magnitude of the discharge current of the energy storage element 5 can be controlled. For example, the upper bridge arm of the C-phase bridge arm and the lower bridge arm of the B-phase bridge arm can be turned on, and the lower bridge arm of the C-phase bridge arm and the upper bridge arm of the B-phase bridge arm can be turned off to realize the conduction of the energy storage element 5 to release energy to the motor winding 4.

[0100] The controller 6 can be configured to determine whether the third preset condition is met by the following means: the voltage increases to the first target voltage, or the duration of the lower arm turn-off of the first target bridge arm and the second bridge arm 8 reaches the maximum allowable duration.

[0101] For example, in the state before the third preset condition is met (i.e., in the state before the fourth preset condition is met), the battery 1, the first boost inductor 2 and the second boost inductor 7 charge the energy storage element 5. The energy stored in the battery 1, the first boost inductor 2 and the second boost inductor 7 is continuously transferred to the energy storage element 5. The voltage across the energy storage element 5 increases continuously over time, while the energy stored in the first boost inductor 2 and the second boost inductor 7 decreases.

[0102] If the voltage increases to the first target voltage, it can be determined that the energy storage element 5 has completed charging and can be used to supply power to the load in the high-voltage system of the electric vehicle. At this time, it can be determined that the third preset condition is met, and the lower bridge arm of the first target bridge arm and the upper bridge arm of the second bridge arm 8 are controlled to be turned on and turned off. At this time, the energy storage element 5 begins to discharge, and the first boost inductor 2 and the second boost inductor 7 begin to charge.

[0103] Under the condition that the fourth preset condition is met, the on / off states of the upper arm of the first target bridge arm, the upper arm of the second bridge arm 8, and the power devices in the other phases of the first bridge arm 3 are not always uniquely fixed. However, the lower arms of the first target bridge arm and the second bridge arm 8 are always off, and the maximum allowable duration for each power device is consistent. Once the lower arm of the first target bridge arm or the second bridge arm 8 is turned on, the controller 6 no longer corresponds to the fourth preset condition. Therefore, based on the relationship between the off-time of the lower arms of the first target bridge arm and the second bridge arm 8 and the maximum allowable time, it can be determined whether the third preset condition is met, in order to avoid excessive wear on the power devices in the lower arms of the first target bridge arm and the second bridge arm 8 and ensure their safe operation thereafter.

[0104] exist Figure 8 If the voltage or duration meets the fourth preset condition, the lower arm of the first target bridge arm (phase A bridge arm) and the second bridge arm 8 are turned off, while the upper arm can be turned off or turned on. Preferably, the upper arm of both is controlled to be on. The specific reasons for this have been described in detail in the previous embodiments and will not be elaborated here.

[0105] When the lower arm of phase A and the second bridge arm 8 are turned off, the current flows out from the positive terminal of battery 1, passes through the first boost inductor 2 and the upper arm of phase A in sequence, and flows into the first terminal of energy storage element 5. Figure 8 The energy flows into the first end of the energy storage element 5 via the upper end of the plane shown, or sequentially through the upper arm of the second boost inductor 7 and the second bridge arm 8, and then from the second end of the energy storage element 5. Figure 8 The current flows out from the lower end (in the planar direction shown) into the negative terminal of battery 1. This process enables battery 1, the first boost inductor 2, and the second boost inductor 7 to charge the energy storage element 5. Simultaneously, the number of power devices and their duty cycle in the B-phase and C-phase bridge arms can be controlled, allowing battery 1, the first boost inductor 2, and the second boost inductor 7 to provide energy to the motor winding 4. For example, the lower bridge arm of the B-phase bridge arm can be controlled to conduct, allowing current to flow from the positive terminal of battery 1 through the first boost inductor 2, the A-phase winding, the B-phase winding, and the lower bridge arm of the B-phase bridge arm back to the negative terminal of battery 1.

[0106] The controller 6 can be configured to determine whether the fourth preset condition is met by the following means: the voltage decreases to the second target voltage, or the duration of conduction of the lower bridge arm of the first target bridge arm and the second bridge arm 8 reaches the maximum allowable duration.

[0107] For example, in the previous state that satisfies the fourth preset condition (i.e., in the state that satisfies the third preset condition), the battery 1 charges the first boost inductor 2 and the second boost inductor 7, the energy storage element 5 releases energy to the motor winding 4, the energy in the first boost inductor 2 and the second boost inductor 7 continuously increases, and the voltage across the energy storage element 5 continuously decreases over time.

[0108] If the voltage decreases to the second target voltage, it can be determined that the voltage across the energy storage element 5 is too low to continue releasing energy to the motor winding 4, and the energy storage element 5 needs to be charged. At this time, it can be determined that the fourth preset condition is met, and the lower bridge arm of the first target bridge arm and the second bridge arm 8 is turned off, so that the energy storage element 5 starts to charge, and the battery 1, the first boost inductor 2 and the second boost inductor 7 provide energy to the motor winding 4.

[0109] Under the condition that the third preset condition is met, the on / off state of the power devices in the other phases of the first bridge arm 3 (excluding the first target bridge arm) is not always uniquely fixed. However, the lower bridge arm of the second bridge arm 8 and the first target bridge arm are always on, and the upper bridge arm is always off. The maximum allowable duration for each power device is consistent. Once the second bridge arm 8 or the lower bridge arm of the first target bridge arm is off, the controller 6 no longer corresponds to the third preset condition. Therefore, the fourth preset condition can be determined based on the relationship between the on-time and maximum allowable duration of the lower bridge arm of the second bridge arm 8 and the first target bridge arm, in order to avoid excessive wear on the power devices in the first target bridge arm and the second bridge arm 8 and ensure their safe operation thereafter.

[0110] By alternating between satisfying the third and fourth preset conditions, voltage boosting can be achieved, while the motor can simultaneously perform inverter drive. The timing of the power devices' operation during inverter drive and voltage boost overlaps; therefore, these two functions can be coupled together.

[0111] For the staggered boost configuration strategy, the phases of the electromotive forces of different boost inductors are staggered during staggered boosting. The staggering angle can be determined based on the number of boost inductors (including the first boost inductor 2 and the second boost inductor 7). Figure 6 For example, the phase difference between the electromotive forces of the first boost inductor 2 and the second boost inductor 7 is 180°. If there is one phase of the first boost inductor 2 and two phases of the second boost inductor 7, the phase difference between the electromotive forces of the first boost inductor 2 and one phase of the second boost inductor 7 is 120°, and the phase difference between the electromotive forces of the second boost inductor 7 and the other phase of the second boost inductor 7 is also 120°. Based on the staggered boost configuration strategy, the voltage across the energy storage element 5 hardly changes after it is fully charged.

[0112] by Figure 6 Taking the circuit topology as an example, for the interleaved boost configuration strategy, controller 6 can be configured as follows:

[0113] In response to the determination that the duration meets the fifth preset condition, the lower bridge arm of the second bridge arm 8 is turned on and the upper bridge arm is turned off, and the lower bridge arm of the first target bridge arm is turned off, so that the battery 1 charges the second boost inductor 7, and the first boost inductor 2 and the battery 1 charge the energy storage element 5 and release energy to the motor winding 4.

[0114] In response to the determination that the duration meets the sixth preset condition, the lower bridge arm of the second bridge arm 8 is turned off, the lower bridge arm of the first target bridge arm is turned on and the upper bridge arm is turned off, so that the battery 1 charges the first boost inductor 2, the second boost inductor 7 and the battery 1 charge the energy storage element 5 and release energy to the motor winding 4.

[0115] exist Figure 9 During the test (when the duration meets the fifth preset condition), the lower arm of the second bridge arm 8 is turned on and the upper arm is turned off, while the lower arm of the first target bridge arm (phase A bridge arm) is turned off and the upper arm can be turned on or off. Preferably, the upper arm of the first target bridge arm is turned on. The specific reasons for this have been described in detail in the previous embodiments and will not be elaborated here.

[0116] like Figure 9 As shown, current flows out from the positive terminal of battery 1, passes through the second boost inductor 7 and the lower bridge arm of the second bridge arm 8, and flows into the negative terminal of battery 1 to charge the second boost inductor 7; current flows out from the positive terminal of battery 1, passes through the first boost inductor 2 and the upper bridge arm of the first target bridge arm, and flows into the first terminal of energy storage element 5. Figure 9 (the upper end in the planar direction shown), and then from the second end of the energy storage element 5 ( Figure 9 The energy flows out from the lower end in the planar direction shown and returns to the negative terminal of battery 1, which allows the first boost inductor 2 and battery 1 to charge the energy storage element 5. At the same time, the number of power devices and their duty cycle in phase B and phase C can be controlled to release energy from the first boost inductor 2 and battery 1 to the motor winding 4, and the magnitude of the discharge current of the energy storage element 5 can be controlled. For example, the upper arm of phase C and the lower arm of phase B can be turned on, and the lower arm of phase C and the upper arm of phase B can be turned off, so as to realize the conduction of the energy release circuit from the first boost inductor 2 and battery 1 to the motor winding 4.

[0117] The controller 6 can be configured to determine whether the fifth preset condition is met by the following means: the lower arm of the second bridge arm 8 is turned off, and the conduction time of the lower arm of the first target bridge arm reaches the maximum allowable time.

[0118] For example, under the condition that the sixth preset condition is met, the on / off state of the power devices in the upper arm of the second bridge arm 8 and the other phases of the first bridge arm 3 is not always uniquely fixed. However, the lower arm of the first target bridge arm is always on, and the lower arm of the second bridge arm 8 is always off. The maximum allowable duration for each power device is consistent. Once the lower arm of the first target bridge arm is off, or the lower arm of the second bridge arm 8 is on, the controller 6 no longer corresponds to the sixth preset condition. Therefore, based on the relationship between the off-off state of the lower arm of the second bridge arm 8, the on-off duration of the lower arm of the first target bridge arm, and the maximum allowable duration, it can be determined whether the on / off state of the power devices of the bridge arm needs to be changed (i.e., whether the fifth preset condition is met) to avoid excessive losses and ensure safe operation thereafter.

[0119] exist Figure 10 During the test (when the duration meets the sixth preset condition), the lower arm of the first target bridge arm (phase A bridge arm) is turned on and the upper arm is turned off, while the lower arm of the second bridge arm 8 is turned off and the upper arm can be turned on or off. Preferably, the upper arm of the second bridge arm 8 is turned on. The specific reasons for this have been described in detail in the previous embodiments and will not be elaborated here.

[0120] like Figure 10 As shown, current flows out from the positive terminal of battery 1, passes through the first boost inductor 2 and the lower arm of the first target bridge arm, and flows into the negative terminal of battery 1 to charge the first boost inductor 2; current flows out from the positive terminal of battery 1, passes through the second boost inductor 7 and the upper arm of the second bridge arm 8, and flows into the first terminal of energy storage element 5. Figure 10 (the upper end in the planar direction shown), and then from the second end of the energy storage element 5 ( Figure 10 The energy flows out from the lower end in the planar direction shown and returns to the negative terminal of battery 1, so that the second boost inductor 7 and battery 1 charge the energy storage element 5. At the same time, the number of power devices in phase B and phase C bridge arms and their duty cycle can be controlled to release energy from the second boost inductor 7 and battery 1 to the motor winding 4, and to control the magnitude of the discharge current of the energy storage element 5.

[0121] The controller 6 can be configured to determine whether the sixth preset condition is met by the following method: the duration of the lower arm of the second bridge arm 8 being turned on and the duration of the lower arm of the first target bridge arm being turned off reaches the maximum allowable duration.

[0122] For example, under the condition that the fifth preset condition is met, the on / off state of the upper bridge arm of the first target bridge arm and the power devices in the other phases of the first bridge arm 3 is not always uniquely fixed, but the lower bridge arm of the first target bridge arm is always off and the lower bridge arm of the second bridge arm 8 is always on, and the maximum allowable duration for each power device is consistent. Once the lower bridge arm of the first target bridge arm is on, or the lower bridge arm of the second bridge arm 8 is off, the controller 6 no longer corresponds to the fifth preset condition. Therefore, based on the relationship between the on / off duration of the lower bridge arm of the second bridge arm 8 and the lower bridge arm of the first target bridge arm and the maximum allowable duration, it can be determined whether the on / off state of the power devices of the bridge arm needs to be changed (i.e., whether the sixth preset condition is met), in order to avoid excessive losses and ensure safe operation thereafter.

[0123] When the controller 6 employs an alternating boost configuration strategy, ideally, the energy storage element 5, once fully charged, never discharges. That is, the voltage across the energy storage element 5 remains constant after charging. Even if the voltage across the energy storage element 5 drops, it will rise again due to the alternating cycle of satisfying the third and fourth preset conditions. If the capacitance of the energy storage element 5 has reached its maximum value, it can cease storing energy, and the battery 1 and boost inductor will provide energy to the motor winding 4. Boosting can be achieved through the alternating cycle of satisfying the fifth and sixth preset conditions, while simultaneously enabling the motor to perform inverter drive. The timing of the power devices' actions in implementing inverter drive and boosting overlaps; therefore, these two functions can be coupled together.

[0124] This disclosure also provides a vehicle including the energy processing device described above.

[0125] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0126] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0127] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An energy processing device, characterized in that, It includes a battery (1), a first boost inductor (2), a multiphase first bridge arm (3), a multiphase battery winding (4), an energy storage element (5), and a controller (6); The first end of each phase battery winding (4) is connected to the midpoint of the corresponding first bridge arm (3), and the second end of each phase battery winding (4) is connected together; the first end of each phase first bridge arm (3) is connected to the first end of the energy storage element (5), and the second end of each phase first bridge arm (3) is connected to the second end of the energy storage element (5) and the negative terminal of the battery (1); The first end of the first boost inductor (2) is connected to the positive terminal of the battery (1), and the second end of the first boost inductor (2) is connected to the midpoint of the first target bridge arm, wherein the first target bridge arm is any one of the first bridge arms (3); The controller (6) is connected to each phase first bridge arm (3), and the controller (6) is configured to control the first bridge arm (3) to achieve boost voltage and motor drive through the first target bridge arm; The controller (6) is configured as follows: Obtain the voltage across the energy storage element (5) and the time elapsed between the upper and lower arms of the first bridge arm (3) and the last on / off state switch. The switching of the on / off state of the upper and lower arms of the first bridge arm (3) is controlled according to the voltage or the duration.

2. The apparatus according to claim 1, characterized in that, The controller (6) is configured as follows: In response to determining that the voltage or the duration meets the first preset condition, the lower bridge arm of the first target bridge arm is turned on and the upper bridge arm is turned off, so that the battery (1) charges the first boost inductor (2) and the energy storage element (5) releases energy to the battery winding (4). In response to determining that the voltage or the duration meets the second preset condition, the lower bridge arm of the first target bridge arm is controlled to turn off, so that the battery (1) and the first boost inductor (2) charge the energy storage element (5) and release energy to the battery winding (4).

3. The apparatus according to claim 2, characterized in that, The controller (6) is configured to determine that a first preset condition is met by means of: If the voltage increases to the first target voltage, or the duration of the lower arm of the first target bridge arm being turned off reaches the maximum allowable duration, then the first preset condition is determined to be met.

4. The apparatus according to claim 2, characterized in that, The controller (6) is configured to determine that the second preset condition is met by means of: If the voltage decreases to the second target voltage, or the conduction time of the lower arm of the first target bridge arm reaches the maximum allowable time, then the second preset condition is determined to be met.

5. The apparatus according to claim 1, characterized in that, The device also includes at least one phase second boost inductor (7) and at least one phase second bridge arm (8). The first end of each phase second boost inductor (7) is connected to the positive terminal of the battery (1), and the second end of each phase second boost inductor (7) is connected to the midpoint of the corresponding second bridge arm (8). The number of second boost inductors (7) and second bridge arms (8) is the same. The first end of the second bridge arm (8) is connected to the first end of the energy storage element (5), and the second end of the second bridge arm (8) is connected to the second end of the energy storage element (5) and the negative terminal of the battery (1). The controller (6) is connected to each phase second bridge arm (8) and the controller (6) is configured to control the second bridge arm (8) to achieve voltage boost through the second bridge arm (8).

6. The apparatus according to claim 5, characterized in that, The controller (6) is configured as follows: Obtain the voltage across the energy storage element (5) and the time elapsed between the upper and lower arms of the first bridge arm (3) and the upper and lower arms of the second bridge arm (8) and the last on / off state switch. Based on the voltage or the duration, control the switching of the on / off states of the upper and lower arms of the first arm (3) and the second arm (8).

7. The apparatus according to claim 6, characterized in that, The controller (6) is configured as follows: In response to determining that the voltage or the duration meets the third preset condition, the lower bridge arm of the first target bridge arm and the upper bridge arm of the second bridge arm (8) are controlled to be turned on and the upper bridge arm is turned off, so that the battery (1) charges the first boost inductor (2) and the second boost inductor (7), and the energy storage element (5) releases energy to the battery winding (4); In response to determining that the voltage or the duration meets the fourth preset condition, the lower bridge arm of the first target bridge arm and the second bridge arm (8) is controlled to be turned off so that the battery (1), the first boost inductor (2) and the second boost inductor (7) charge the energy storage element (5) and release energy to the battery winding (4).

8. The apparatus according to claim 7, characterized in that, The controller (6) is configured to determine whether a third preset condition is met by means of: If the voltage increases to the first target voltage, or the duration of the lower arm of the first target bridge arm and the second bridge arm (8) being turned off reaches the maximum allowable duration, then the third preset condition is determined to be met.

9. The apparatus according to claim 7, characterized in that, The controller (6) is configured to determine that the fourth preset condition is met by means of: If the voltage decreases to the second target voltage, or the duration of conduction of the lower bridge arm of the first target bridge arm and the second bridge arm (8) reaches the maximum allowable duration, then the fourth preset condition is determined to be satisfied.

10. The apparatus according to claim 6, characterized in that, The controller (6) is configured as follows: In response to determining that the duration meets the fifth preset condition, the lower bridge arm of the second bridge arm (8) is turned on and the upper bridge arm is turned off, and the lower bridge arm of the first target bridge arm is turned off, so that the battery (1) charges the second boost inductor (7), and the first boost inductor (2) and the battery (1) charge the energy storage element (5) and release energy to the battery winding (4); In response to determining that the duration meets the sixth preset condition, the lower bridge arm of the second bridge arm (8) is turned off, the lower bridge arm of the first target bridge arm is turned on and the upper bridge arm is turned off, so that the battery (1) charges the first boost inductor (2), the second boost inductor (7) and the battery (1) charge the energy storage element (5) and release energy to the battery winding (4).

11. The apparatus according to claim 10, characterized in that, The controller (6) is configured to determine whether the fifth preset condition is met by means of: If the lower arm of the second bridge arm (8) is turned off and the conduction time of the lower arm of the first target bridge arm reaches the maximum allowable time, then the fifth preset condition is determined to be met.

12. The apparatus according to claim 10, characterized in that, The controller (6) is configured to determine whether the sixth preset condition is met by means of: If the duration of the lower arm of the second bridge arm (8) being turned on and the duration of the lower arm of the first target bridge arm being turned off reaches the maximum allowable duration, then the sixth preset condition is determined to be satisfied.

13. The apparatus according to claim 1, characterized in that, The battery winding (4) is the battery winding (4) of the vehicle's drive motor.

14. The apparatus according to claim 1, characterized in that, The energy storage element (5) includes a capacitor.

15. A vehicle, characterized in that, include: The energy processing device according to any one of claims 1-14.

Images