CN215420063U

CN215420063U - Power distribution circuit, motor control system and vehicle

Info

Publication number: CN215420063U
Application number: CN202120463639.9U
Authority: CN
Inventors: 邹瑞杰; 熊建
Original assignee: Beiqi Foton Motor Co Ltd
Current assignee: Beiqi Foton Motor Co Ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2022-01-04
Anticipated expiration: 2031-03-03

Abstract

The present disclosure relates to a power distribution circuit, a motor control system, and a vehicle. The power distribution circuit includes: the power supply comprises a power supply and a chip with multiple output interfaces, wherein each output interface is used for providing voltage with known magnitude, and the power supply is connected with the chip; each output interface of the chip is used for being connected with electric equipment to form a power supply branch circuit and converting the voltage of the power supply into the target voltage of the electric equipment connected with the output interface. Thus, wide power input can be achieved without the need to reuse a first-stage voltage reduction circuit. In addition, a primary voltage reduction circuit is not required to be designed, so that the number of peripheral devices is reduced, the design target of ASILD is easy to achieve, and the occupied space on a PCB can be effectively reduced.

Description

Power distribution circuit, motor control system and vehicle

Technical Field

The present disclosure relates to the field of vehicle technologies, and in particular, to a power distribution circuit, a motor control system, and a vehicle.

Background

Along with the demonstration and operation of hybrid electric vehicles and pure electric vehicles in important cities across the country, people are also more concerned about the power distribution problem of the hybrid electric vehicles and the pure electric vehicles. The low-voltage power supply platform of the existing hybrid electric vehicle and pure electric vehicle is 12V or 24V, and most of the low-voltage power supply platform is 12V, so that the application requirements of wide power supply input of 9V-32V cannot be met. In order to meet the requirement of wide Power input, the existing scheme adopts two-stage voltage reduction, firstly, the voltage of 24V is reduced to the voltage of 12V, and then the voltage of 12V is input into a PMIC (Power Management IC) to obtain different voltages of each path, so as to meet the requirement of wide Power input. However, since the number of peripheral devices is increased by one step of voltage reduction Circuit, the number of failure points is increased, it is difficult to achieve the design target of asidd, and the space occupied on a PCB (Printed Circuit Board) is increased due to low integration level. Where ASIL is the automotive safety integrity rating, ASIL has A, B, C, D four ratings, and asidl is the highest rating.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a power distribution circuit, a motor control system, and a vehicle to solve the problems existing in the prior art.

In order to achieve the above object, the present disclosure provides a power distribution circuit including: the power supply comprises a power supply and a chip with multiple output interfaces, wherein each output interface is used for providing voltage with known magnitude, and the power supply is connected with the chip;

each output interface of the chip is used for being connected with electric equipment to form a power supply branch circuit and converting the voltage of the power supply into the target voltage of the electric equipment connected with the output interface.

Optionally, the power distribution circuit further includes: a filter device located between the power supply and the chip;

the filter device is used for filtering the voltage of the power supply and sending the filtered voltage to the chip.

Optionally, the chip is an SBC FS8510 chip; the electric device includes: microprocessor, microprocessor analog/digital converter, analog signal conditioning circuit, rotary transformer decoder, CAN transceiver and digital logic circuit, and microprocessor has three voltage interface, is first voltage interface, second voltage interface and third voltage interface respectively, power distribution circuit still includes: a first chip;

a first output interface, a second output interface, and a third output interface of the SBC FS8510 chip are respectively connected to the first voltage interface, the second voltage interface, and the third voltage interface of the microprocessor, wherein voltages provided by the first output interface, the second output interface, and the third output interface are respectively the same as voltages corresponding to the first voltage interface, the second voltage interface, and the third voltage interface;

a fourth output interface of the SBC FS8510 chip is connected to the microprocessor/digital converter via the first chip, wherein a voltage provided by the fourth output interface is greater than or less than a target voltage of the microprocessor/digital converter;

a fifth output interface of the SBC FS8510 chip is connected with the analog signal conditioning circuit;

and a sixth output interface of the SBC FS8510 chip is respectively connected with the rotary transformer decoder, the CAN transceiver and the digital logic circuit.

Optionally, the power consuming device comprises: the power supply comprises a driving board, a driving board chip, a direct current bus current sensor and a three-phase current sensor, wherein the power supply is also connected with the driving board; the power distribution circuit further includes: two second chips, a third chip;

the fourth output interface of the SBC FS8510 chip is connected to the driving board chip and the three-phase current sensor via one second chip, respectively, wherein the voltage provided by the fourth output interface is greater than or less than target voltages of the driving board chip, the dc bus current sensor, and the three-phase current sensor;

and the fourth output interface of the SBC FS8510 chip is connected with the dc bus current sensor through the third chip.

Optionally, each power supply branch has a fault response mechanism;

and aiming at each power supply branch, when the power supply abnormality of the power supply branch is detected, the SBC FS8510 chip executes corresponding operation according to a fault response mechanism corresponding to the power supply branch.

Optionally, the power supply abnormality includes: the current of the power supply branch is larger than a preset current threshold value, and/or the voltage of the electric equipment is not in a normal voltage range.

Optionally, for each power supply branch not including any one of the first chip, the second chip, and the third chip, when power supply abnormality of the power supply branch is detected, the SBC FS8510 chip is powered off; and

aiming at each power supply branch comprising the first chip, the second chip or the third chip, if the power supply branch is detected to supply power abnormally, the current of the power supply branch is larger than a preset current threshold value, the current of the power supply branch is limited by other target chips in the power supply branches, and if the power supply branch is detected to supply power abnormally, the voltage of electric equipment in the power supply branch is not in a normal voltage range, an interrupt signal is generated by the SBC FS8510 chip to indicate a microprocessor to execute corresponding actions.

Optionally, the first chip is a reference chip TL4050C50, the second chip is a Tracker TLs115D0 with a current limiting function, and the third chip is a Tracker TLE4250 with a current limiting function.

The second aspect of the present disclosure further provides a motor control system, which includes an electric device and the power distribution circuit provided by the first aspect of the present work card.

The third aspect of the present disclosure also provides a vehicle including: the motor control system provided by the second aspect of the present disclosure.

Through the technical scheme, the voltage of the power supply is directly converted into the target voltage of different electric equipment through the chip with the multi-output interface, so that the wide power supply input can be realized without reusing the primary voltage reduction circuit. In addition, a primary voltage reduction circuit is not required to be designed, so that the number of peripheral devices is reduced, the design target of ASILD is easy to achieve, and the occupied space on a PCB can be effectively reduced.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a block diagram of a motor control system of a pure electric vehicle in the related art.

Fig. 2 is a block diagram illustrating a power distribution circuit according to an example embodiment.

Fig. 3 is a schematic diagram illustrating a power distribution circuit in accordance with an exemplary embodiment.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

Fig. 1 is a block diagram of a motor control system of a pure electric vehicle in the related art. In the motor controller system shown in fig. 1, the basic principle of motor control is: the motor control board receives an instruction of the vehicle control unit, combines direct current bus current collected by the direct current bus current sensor, current operation physical quantities such as motor three-phase winding current, an obtained motor angle (which is an offset angle of the motor relative to a preset zero point), motor speed and the like collected by the three-phase current sensor, and outputs a PWM wave with a certain time sequence to the drive board to drive the insulated gate bipolar transistor IGBT after operation through a specific algorithm in the related technology, so that the rotating speed and the torque of the motor are controlled. When the motor control board judges that parameters such as IGBT temperature, motor temperature, direct current bus current, motor three-phase winding current appear unusually, protect IGBT through driving IGBT logic protection circuit to prevent IGBT and motor damage and burn out, can also guarantee vehicle operation and driver and crew's safety simultaneously. It should be noted that the IGBT described herein is located between the motor and the power supply for supplying power to the motor, and when the IGBT is turned on, the power supply may supply power to the motor to normally rotate the motor, and when the IGBT is turned off, the power supply may stop supplying power to the motor to stop rotating the motor.

It is known that the safety and reliability of the design of the motor control system are important for the safe running of the vehicle. In the reliability design of the motor control system, the power supply of the motor control system is uniformly provided by a motor control board, the working voltages required by different electric devices (such as a microcontroller MCU shown in fig. 1, an analog signal conditioning circuit, a rotary transformer decoder, a CAN transceiver, a fault judgment circuit, an IGBT logic protection circuit, an IGBT driving waveform generation circuit, a driving board (i.e., an IGBT driving board), a driving chip, a direct-current bus current sensor and a three-phase current sensor) are different, and in order to ensure the normal operation of each electric device, the power supply needs to be reasonably distributed.

Fig. 2 is a block diagram illustrating a power distribution circuit according to an example embodiment. As shown in fig. 2, the power distribution circuit may include: a power supply 10 and a chip 20 having a multi-output interface, wherein the power supply 10 is connected to the chip 20, and each of the multi-output interfaces is used for providing a voltage with a known magnitude.

As described above, most of the pure voltage power supply platforms are 12V or 24V, and therefore, the voltage of the power supply 10 is 12V or 24V, and in the present disclosure, the voltage of the power supply is 24V.

Each output interface of the chip 20 is used for connecting with a power consumption device to form a power supply branch, and can convert the voltage of the power supply source 10 into a target voltage of the power consumption device connected with the output interface. It should be noted that the target voltage of the electric device may be understood as a voltage required for normal operation of the electric device, and the target voltages of different electric devices are not identical. In the present disclosure, the electric device includes an electric device inside the motor control board and an electric device outside the motor control board.

By adopting the power distribution circuit, the voltage of the power supply is directly converted into the target voltage of different electric equipment through the chip with the multi-output interface, so that the wide power input can be realized without using a primary voltage reduction circuit. In addition, a primary voltage reduction circuit is not required to be designed, so that the number of peripheral devices is reduced, the design target of ASILD is easy to achieve, and the occupied space on a PCB can be effectively reduced.

Fig. 3 is a schematic diagram illustrating a power distribution circuit in accordance with an exemplary embodiment. As shown in fig. 3, a filter device is further disposed between the power supply 10 and the chip 20, and is configured to perform filtering protection on the voltage of the power supply 10 and send the filtered voltage to the chip 20, and the chip 20 is further configured to convert the filtered voltage into a target voltage of different electric devices.

As shown in FIG. 3, the chip 20 may be an SBC FS8510 chip. The electric equipment 20 may be an electric equipment inside a motor control panel, and includes a microprocessor, a microprocessor analog/digital converter, an analog signal conditioning circuit, a rotary encoder, a CAN transceiver, and a digital logic circuit, where the data logic circuit may include a fault determination circuit, an IGBT logic protection circuit, and an IGBT drive waveform generation circuit. The microprocessor MCU is provided with three voltage interfaces, and the voltage input by each voltage interface is different and is respectively marked as a first voltage interface, a second voltage interface and a third voltage interface.

The first voltage interface of the microprocessor MCU is used for inputting 1.3V voltage, the second voltage interface of the microprocessor MCU is used for inputting 3.3V voltage, and the third voltage interface of the microprocessor MCU is used for inputting 5.0V voltage. The target voltages of the microprocessor/digital converter, the rotary transformer decoder, the CAN transceiver and the digital logic circuit are all 5.0V.

A first output interface, a second output interface, and a third output interface of the SBC FS8510 chip are respectively connected to the first voltage interface, the second voltage interface, and the third voltage interface of the microprocessor to form power supply branches, respectively, where the voltages provided by the first output interface, the second output interface, and the third output interface are respectively the same as the voltages corresponding to the first voltage interface, the second voltage interface, and the third voltage interface.

Illustratively, as shown in fig. 3, the first output interface is an interface of 2.6A @1.3V BUCK1 of the SBC FS8510 chip, which may be referred to as a switching power supply SMPS _1V3, i.e., the first output interface is used for providing a voltage of 1.3V. The second output interface is an interface of the SBC FS8510 chip, which is 2.6A @3.3V BUCK3, and may be referred to as a switching power supply SMPS _3V3, that is, the second output interface is used to provide a voltage of 3.3V. The third output interface is 150mA @5V LDO1, which may be denoted as LDO1 — 5V, i.e., the third output interface is used to provide a voltage of 5.0V.

Therefore, in fig. 3, a first output interface of the SBC FS8510 chip is connected to a first voltage interface of the microprocessor MCU, a second output interface of the SBC FS8510 chip is connected to a second voltage interface of the microprocessor MCU, and a third output interface of the SBC FS8510 chip is connected to a third voltage interface of the microprocessor MCU.

As shown in fig. 3, the power distribution circuit further includes: a first chip, which may be the reference chip TL4050C 50. And a fourth output interface of the SBC FS8510 chip is connected with the microprocessor analog/digital converter through the first chip to form a power supply branch, wherein the voltage provided by the fourth output interface is greater than or less than the target voltage of the microprocessor analog/digital converter.

In this disclosure, the fourth output interface of the SBC FS8510 chip is 1.1A @5.74V Boost, which is denoted as Boost _5V74, that is, the fourth output interface is used to provide a voltage of 5.74V, and the target voltage of the microprocessor analog/digital converter is 5V, so that the first chip is further required to convert the voltage of 5.74V provided by the fourth output interface into a voltage of 5.0V, and then supply power to the microprocessor analog/digital converter.

As shown in fig. 3, the fifth output interface of the SBC FS8510 chip may be 150mA @5V LDO2, which may be referred to as LDO2 — 5V, that is, the fifth output interface is used to provide a voltage of 5.0V, and the target voltage of the analog signal conditioning circuit is 5.0V, and then the fifth output interface may be directly connected to the analog signal conditioning circuit to form a power supply branch.

The sixth output interface of the SBC FS8510 chip may be 3A @5V VPRE, which may be recorded as a switching power supply SMPS _5V, that is, the sixth output interface is configured to provide a voltage of 5.0V, and target voltages of the resolver decoder, the CAN transceiver, and the digital logic circuit are all 5.0V, so that the sixth output interface of the SBC FS8510 chip may be directly connected to the resolver decoder, the CAN transceiver, and the digital logic circuit, respectively.

In this way, the purpose of supplying power to the electric equipment inside the motor control board by using the power supply 10 and the chip 20 can be achieved.

In addition, the electric equipment can also be external electric equipment of the motor control panel, and can comprise: the driving plate, the driving plate chip, the direct current bus current sensor and the three-phase current sensor. In the present disclosure, the power supply 10 is 24V, and the target voltage of the driver board is also 24V, and thus, the driver board may be directly powered by the power supply 10, that is, the power supply 10 may be directly connected to the driver board.

In the present disclosure, the target voltages of the driving board chip, the dc bus current sensor and the three-phase current sensor are all 5.0V. In an embodiment, an output interface providing a voltage of 5.0V in the SBC FS8510 chip may be used to directly supply power to the driver board chip, the dc bus current sensor, and the three-phase current sensor, but it is considered that if a plurality of electric devices are directly connected to one output interface at the same time, when one of the power supply branches including the data interface is abnormal, the other power supply branches including the output interface may not work. Therefore, in another embodiment, the driving board chip, the direct current bus current sensor and the three-phase current sensor are respectively connected with the same output interface through other chips.

Illustratively, as shown in fig. 3, the power distribution circuit further includes: two second chips, a third chip. The second chip may be a Tracker TLS115D0 with current limiting function, and the third chip may be a Tracker TLE4250 with current limiting function.

In fig. 3, a fourth output interface of the SBC FS8510 chip is connected to the driving board chip and the three-phase current sensor via a second chip, respectively, wherein a voltage provided by the fourth output interface is greater than or less than target voltages of the driving board chip, the dc bus current sensor, and the three-phase current sensor. Illustratively, a fourth output interface of the SBC FS8510 chip is connected to the driver board chip via a second chip to form a power supply branch, and the fourth output interface is connected to the three-phase current sensor via another second chip to form a power supply branch. And a fourth output interface of the SBC FS8510 chip is connected with the direct-current bus current sensor through the third chip to form a power supply branch. Thus, the purpose of independently supplying power to the driving board chip, the three-phase current sensor and the direct current bus current sensor can be realized by utilizing one output interface in the chip 20.

It should be noted that fig. 3 also shows the current of each power supply branch during normal power supply, for example, the current of the power supply branch in which the digital logic circuit is located is 20mA during normal power supply, the current of the power supply branch in which the rotary encoder is located is 500mA during normal power supply, the current of the power supply branch in which the analog signal conditioning circuit is located is 30mA during normal power supply, and so on.

By adopting the technical scheme, the multiple output interfaces of the SBC FS8510 chip and other chips are utilized to realize independent power supply of internal electric equipment and external electric equipment of the motor control board.

In addition, each power supply branch of the SBC FS8510 chip has a fault response mechanism, and the fault response mechanism of each power supply branch may be the same or different. For each power supply branch, when power supply abnormality of the power supply branch is detected, the SBC FS8510 chip executes corresponding operations according to a fault response mechanism corresponding to the power supply branch. The abnormal power supply of the output interface can be determined by detecting the output current and/or voltage of the output interface, or by detecting the circuit and/or voltage of the electric equipment connected with the output interface.

The power supply abnormality may include that the current of the power supply branch is greater than a preset current threshold, and/or that the voltage of the electric device is not within a normal voltage range.

In the present disclosure, for each power supply branch, the normal voltage range may be determined according to a target voltage of the powered device in the power supply branch. For example, the voltage of the first voltage interface of the microprocessor MCU is 1.3V, the normal voltage corresponding to the power supply branch where the first voltage interface of the microprocessor MCU is located is [1.17V, 1.43V ], the voltage of the second voltage interface of the microprocessor MCU is 3.3V, the normal voltage corresponding to the power supply branch where the second voltage interface of the microprocessor MCU is located is [2.97V, 3.63V ], the voltage of the third voltage interface of the microprocessor MCU is 5.0V, the normal voltage corresponding to the power supply branch where the second voltage interface of the microprocessor MCU is located is [4.5V, 5.0V ], and so on.

It is worth noting that the fault response mechanism of the power supply branch in which the other chip exists and the power supply branch in which the other chip does not exist is not exactly the same. Thus, in one embodiment, first, in the power supply branch, it is determined whether there are other chips between the target output interface and the powered device. The other chip may be the first chip, the second chip or the third chip shown in fig. 3.

For example, in the power supply branch, if the voltage provided by the target output interface is greater than or less than the target voltage of the electric device, it is determined that there is another chip between the target output interface and the electric device, where the other chip is used to convert the voltage provided by the target output interface into the target voltage of the electric device.

That is, if the voltage provided by the target output interface is the same as the target voltage of the electric device in the power supply branch, the electric device can be supplied with power without converting the voltage by using another chip. If the voltage provided by the target output interface is different from the target voltage of the electric equipment in the power supply branch, the voltage provided by the target output interface needs to be converted by other chips so as to obtain the voltage same as the target voltage of the electric equipment.

It is determined whether there are other chips in the power supply branch in the above manner. If there are no other chips, for example, there are no other chips in the power supply branches where the first output interface, the second output interface, the third output interface, the fifth output interface, and the sixth output interface in fig. 3 are located.

For each power supply branch not including any one of the first chip, the second chip and the third chip, when power supply abnormality of the power supply branch is detected, the SBC FS8510 chip is powered off, so that all output interfaces in the chip are in a powered off state, and after the power supply abnormality fault is eliminated, the SBC FS8510 chip can be controlled to be powered on.

For each power supply branch including the first chip, the second chip or the third chip, if the current of the power supply branch is detected to be larger than a preset current threshold value when the power supply branch supplies power abnormally, the current of the power supply branch is limited by other target chips in the power supply branches, and if the voltage of the electric equipment included in the power supply branch is detected to be not within a normal voltage range when the power supply branch supplies power abnormally, the SBC FS8510 chip generates an interrupt signal to instruct the microprocessor to execute corresponding actions. Thus, the safety of the motor control system, the vehicle and the driver can be ensured.

For example, as shown in fig. 3, when the power supply abnormality of the power supply branch where the first chip is located is detected, the cause of the abnormality is further determined, if the cause of the abnormality is that the current of the power supply branch is greater than a preset current threshold, the first chip is a target other chip in the power supply branch, and the first chip may limit the current of the power supply branch, and if the voltage of the power consumption device included in the power supply branch is not within a normal range, the SBC FS8510 chip generates an interrupt signal to instruct the microprocessor to perform a corresponding action. When power supply abnormality of the power supply branch where the second chip is located is detected, and the abnormality is caused because the current of the power supply branch is larger than a preset current threshold, the Tracker TLS115D0 with the current limiting function limits the current in the power supply branch to 151mA to 500 mA. And when detecting that the power supply branch where the third chip is located is abnormal in power supply and the abnormality is caused because the current of the power supply branch is greater than a preset current threshold, the Tracker TLE4250 with the current limiting function limits the current in the power supply branch to 50mA to 120 mA. Therefore, only the circuit of the abnormal power supply branch is limited, the normal use of other power supply branches is not influenced, and the flexibility of power distribution is improved.

Based on the same conception, the present disclosure also provides a motor control system, which comprises an electric device and the power distribution circuit provided by the present disclosure.

Based on the same concept, the present disclosure also provides a vehicle including the motor control system provided by the present disclosure.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A power distribution circuit, comprising: the power supply comprises a power supply and a chip with multiple output interfaces, wherein each output interface is used for providing voltage with known magnitude, and the power supply is connected with the chip;

2. The power distribution circuit of claim 1, further comprising: a filter device located between the power supply and the chip;

3. The power distribution circuit of claim 1, wherein the chip is an SBC FS8510 chip; the electric device includes: microprocessor, microprocessor analog/digital converter, analog signal conditioning circuit, rotary transformer decoder, CAN transceiver and digital logic circuit, and microprocessor has three voltage interface, is first voltage interface, second voltage interface and third voltage interface respectively, power distribution circuit still includes: a first chip;

4. The power distribution circuit of claim 3, wherein the powered device comprises: the power supply comprises a driving board, a driving board chip, a direct current bus current sensor and a three-phase current sensor, wherein the power supply is also connected with the driving board; the power distribution circuit further includes: two second chips, a third chip;

5. The power distribution circuit of claim 4, wherein each power supply branch has a fault response mechanism;

6. The power distribution circuit of claim 5, wherein the power supply anomaly comprises: the current of the power supply branch is larger than a preset current threshold value, and/or the voltage of the electric equipment is not in a normal voltage range.

7. The power distribution circuit of claim 5,

for each power supply branch not including any one of the first chip, the second chip and the third chip, when power supply abnormality of the power supply branch is detected, powering off the SBC FS8510 chip; and

8. The power distribution circuit of claim 4, wherein the first chip is a reference chip TL4050C50, the second chip is a Tracker TLS115D0 with current limiting function, and the third chip is a Tracker TLE4250 with current limiting function.

9. A motor control system comprising a consumer and a power distribution circuit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized by comprising: the motor control system of claim 9.