High-voltage motor controller circuit board

Abstract

The utility model discloses a high-voltage motor controller circuit board, and relates to the technical field of power electronics. In the top layer of the high-voltage motor controller circuit board, the signal input end of an analog quantity acquisition circuit is electrically connected with an external interface, and the signal output end of the analog quantity acquisition circuit is electrically connected with the signal input end of a main control chip; a first signal input end of the main control chip is electrically connected with an output end of the analog quantity acquisition circuit and is used for generating a motor control signal of the high-voltage motor according to the motor digital signal; the signal input end of the isolation driving circuit is electrically connected with the signal output end of the main control chip; the control end of the power drive circuit is electrically connected with the signal output end of the isolation drive circuit, and the signal output end of the power drive circuit is electrically connected with the high-voltage motor. According to the embodiment of the invention, the control board and the driving board can be effectively integrated, so that the intersystem connecting wire harness is optimized, the overall size of the circuit board is reduced, the cost is reduced, and the reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of power electronics, especially, relate to a high voltage motor controller circuit board. BACKGROUND

[0002] Generally along with the development of new energy automobile and the requirement of energy conservation and emission reduction, the electric drive system based on 800V high voltage platform provides an excellent solution for solving the problems of slow charging speed and insufficient cruising range of new energy automobile. The existing 800V high voltage motor controller technical scheme usually separates the drive control circuit board from the main power circuit board, and connects them through a wire harness, so as to finally realize the drive control of the motor.

[0003] Specifically, the existing motor controller circuit board technical path usually separates the control part from the drive part into two separate circuit boards, and realizes the inter-board connection by using connectors or wire harnesses. In this scheme, the transmission loss of voltage signals and motor control signals during inter-board transmission cannot be ignored, which reduces the signal integrity and control reliability, and is not conducive to realizing high-precision motor drive control. At the same time, the structure of separating the control board from the drive board increases the overall volume of the motor controller circuit board, reduces the horizontal space utilization, and is not conducive to the development of controller integration and portability.

[0004] In view of the above, how to effectively realize the integration of the control board and the drive board of the circuit board so as to optimize the wire harness between systems and reduce the overall volume of the circuit board is a problem to be solved in the industry at present. INVENTION CONTENTS

[0005] The application embodiment provides a high voltage motor controller circuit board, which can effectively integrate the control board and the drive board, thereby optimizing the wire harness between systems and reducing the overall volume of the circuit board, reducing the cost while improving the reliability of high voltage motor control drive.

[0006] In the first aspect, the application embodiment provides a high voltage motor controller circuit board, characterized in that the high voltage motor controller circuit board comprises a top layer, an intermediate layer and a bottom layer arranged in sequence in the thickness direction; the top layer and the bottom layer are electrically connected through the intermediate layer;

[0007] The top layer is provided with:

[0008] An analog quantity acquisition circuit, a signal input end of the analog quantity acquisition circuit is electrically connected with an external interface, a signal output end of the analog quantity acquisition circuit is electrically connected with a signal input end of a master control chip, and the analog quantity acquisition circuit is used for receiving a motor analog signal of a high voltage motor transmitted by the external interface, and performing analog-to-digital conversion on the motor analog signal to obtain a motor digital signal;

[0009] The main control chip is electrically connected with the output end of the analog quantity acquisition circuit, and is used for generating a motor control signal of the high-voltage motor according to the motor digital signal;

[0010] The signal input end of the isolation driving circuit is electrically connected with the signal output end of the main control chip, and the isolation driving circuit is used for performing isolation driving processing on the motor control signal to obtain a power driving signal;

[0011] The control end of the power driving circuit is electrically connected with the signal output end of the isolation driving circuit, the signal output end of the power driving circuit is electrically connected with the high-voltage motor, and the power driving circuit is used for converting the voltage signal of the direct-current bus into a three-phase alternating voltage signal according to the power driving signal, and driving the high-voltage motor to work according to the three-phase alternating voltage.

[0012] According to some embodiments of the present application, optionally, the top layer of the high-voltage motor controller circuit board further comprises:

[0013] The power management circuit is electrically connected with the external interface, the first power supply end of the power management circuit is electrically connected with the analog quantity acquisition circuit, and the second power supply end of the power management circuit is electrically connected with the main control chip;

[0014] The power management circuit is used for receiving an external direct-current power signal transmitted by the external interface, and supplying power to the analog quantity acquisition circuit and the main control chip according to the external direct-current power signal;

[0015] The pre-driving isolation circuit is electrically connected with the third power supply end of the power management circuit, and the power signal output end of the pre-driving isolation circuit is electrically connected with the isolation driving circuit;

[0016] The pre-driving isolation circuit is used for converting a first power voltage signal output by the third power supply end of the power management circuit into a second power voltage signal, and transmitting the second power voltage signal to the isolation driving circuit.

[0017] According to some embodiments of the present application, optionally, the intermediate layer comprises a power layer; the power layer is arranged between the top layer and the bottom layer in the thickness direction of the high-voltage motor controller circuit board;

[0018] The power management circuit supplies power to the analog quantity acquisition circuit, the main control chip and the pre-driving isolation circuit in a copper paving manner in the power layer.

[0019] According to some embodiments of the present application, optionally, the intermediate layer further comprises a signal layer; the signal layer is arranged between the top layer and the power layer in the thickness direction of the high-voltage motor controller circuit board;

[0020] The first wire is electrically connected between the main control chip and the isolation driving circuit, and at least part of the first wire is arranged on the signal layer.

[0021] According to some embodiments of the present application, optionally, the wire direction in the power supply layer is a first direction, and the wire direction in the signal layer is a second direction.

[0022] The first direction and the second direction are orthogonal, or the included angle between the first direction and the second direction is in a preset range.

[0023] According to some embodiments of the present application, optionally, the high-voltage motor controller circuit board further comprises:

[0024] The current sensing circuit is electrically connected between the signal output end of the power driving circuit and the second signal input end of the main control chip.

[0025] The current sensing circuit is used for collecting the three-phase alternating voltage signal output by the power driving circuit, and transmitting the comparison result of the three-phase alternating voltage signal to the main control chip after comparing the three-phase alternating voltage signal with the first set voltage threshold.

[0026] The main control chip is further used for outputting a motor control signal according to the comparison result.

[0027] According to some embodiments of the present application, optionally, the current sensing circuit comprises a current sensor and a current signal processing circuit; the signal input end of the current sensor is electrically connected with the signal output end of the power driving circuit, the signal output end of the current sensor is electrically connected with the signal input end of the current signal processing circuit, and the signal output end of the current signal processing circuit is electrically connected with the second signal input end of the main control chip.

[0028] The current sensor is used for collecting the three-phase alternating voltage signal output by the power driving circuit and transmitting the three-phase alternating voltage signal to the current signal processing circuit.

[0029] The current signal processing circuit is used for transmitting the comparison result to the main control chip after comparing the three-phase alternating voltage signal with the first set voltage threshold.

[0030] The current sensor is arranged on the bottom layer of the high-voltage motor controller circuit board, and the current signal processing circuit is arranged on the top layer of the high-voltage motor controller circuit board.

[0031] According to some embodiments of the present application, optionally, the bottom layer of the high-voltage motor controller circuit board further comprises:

[0032] The DC bus monitoring circuit is electrically connected with the DC bus, and the signal output end of the DC bus monitoring circuit is electrically connected with the main control chip.

[0033] The direct current bus monitoring circuit is configured to sample a voltage signal on the direct current bus and perform a target operation if the voltage signal exceeds a second set voltage threshold.

[0034] According to some embodiments of the present application, optionally, the top layer of the high-voltage motor controller circuit board is further provided with:

[0035] The active discharge function circuit is electrically connected to the main control chip at a control end, and is electrically connected to the direct current bus at a first end and to the ground at a second end.

[0036] The active discharge function circuit is configured to receive an enable signal from the main control chip and to power off the direct current bus according to the enable signal.

[0037] According to some embodiments of the present application, optionally, a slot hole is provided between the power drive circuit and the direct current bus on the top layer.

[0038] The slot hole is configured to make the creepage distance between the power drive circuit and the direct current bus greater than or equal to a preset safety distance.

[0039] Compared with the prior art, the high-voltage motor controller circuit board provided by the embodiments of the present application integrates an analog quantity acquisition circuit, a main control chip, an isolation drive circuit, and a power drive circuit in the top layer. The analog quantity acquisition module receives motor analog signals transmitted by an external interface and converts them into motor digital signals. The analog quantity acquisition module is connected to the main control chip, which can receive the motor digital signals and output motor control signals according to the motor digital signals. The isolation drive circuit is electrically connected to the main control chip and is configured to perform isolation drive processing on the motor control signals to obtain power drive signals. The power drive circuit is electrically connected to the isolation drive circuit and is configured to convert voltage signals of the direct current bus into three-phase alternating voltage signals according to the power drive signals and drive the high-voltage motor to work according to the three-phase alternating voltage. Compared with the prior art, the high-voltage motor controller circuit board provided by the embodiments of the present application can effectively integrate the control board and the drive board, thereby optimizing the connection harness between systems and reducing the overall size of the circuit board, improving the transverse space utilization rate of the motor controller circuit board, reducing costs, and improving the reliability of high-voltage motor control and drive. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced. Those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0041] Figure 1is a structural schematic diagram of a high-voltage motor controller circuit board provided by an embodiment of the present application;

[0042] Figure 2 is a structural schematic diagram of a high-voltage motor controller circuit board provided by another embodiment of the present application;

[0043] Figure 3 is a structural schematic diagram of a high-voltage motor controller circuit board provided by yet another embodiment of the present application;

[0044] Figure 4 is a structural schematic diagram of a high-voltage motor controller circuit board provided by yet another embodiment of the present application;

[0045] Figure 5 is a top-layer structural schematic diagram of a high-voltage motor controller circuit board provided by an embodiment of the present application;

[0046] Figure 6 is a bottom-layer structural schematic diagram of a high-voltage motor controller circuit board provided by another embodiment of the present application;

[0047] Figure 7 is a power-layer structural schematic diagram of a high-voltage motor controller circuit board provided by yet another embodiment of the present application;

[0048] Figure 8 is a signal-layer structural schematic diagram of a high-voltage motor controller circuit board provided by yet another embodiment of the present application. DETAILED DESCRIPTION

[0049] The features and exemplary embodiments of various aspects of the present application will be described in detail below, in order to make the purposes, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0050] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but also other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, the elements defined by the sentence "comprising" do not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements defined by the sentence "comprising".

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0052] As described in the background section, the current motor controller circuit board technology path usually separates the above-mentioned control part and the driving part into two separate circuit boards, and realizes the inter-board connection by using connectors or wiring harnesses.

[0053] In this scheme, the transmission loss of the voltage signal and the motor control signal during the inter-board transmission cannot be ignored, which reduces the signal integrity and control reliability, and is not conducive to the realization of high-precision motor drive control. At the same time, the structure of separating the control board and the driving board in the above-mentioned scheme increases the overall volume of the motor controller circuit board, reduces the utilization rate of the horizontal space, and is not conducive to the development of controller integration and portability.

[0054] In view of the above, how to effectively realize the circuit board integration of the above-mentioned control board and driving board in order to optimize the system wiring harness and reduce the overall volume of the circuit board is a problem to be solved in the industry at present.

[0055] In order to solve the above technical problems, the embodiment of the present application provides a high-voltage motor controller circuit board. The high-voltage motor controller circuit board provided by the embodiment of the present application will be introduced below.

[0056] First, please refer to Figure 1 , Figure 1 The high-voltage motor controller circuit board provided by the embodiment of the present application.

[0057] As Figure 1As shown, the high-voltage motor controller circuit board 100 includes a top layer (TOP layer), an intermediate layer, and a bottom layer (BOTTOM layer) arranged in sequence in the thickness direction, and the top layer and the bottom layer are electrically connected through the intermediate layer. The high-voltage motor controller circuit board can be a printed circuit board (PCB). The top layer of the high-voltage motor controller circuit board 100 is provided with an analog quantity acquisition circuit 20, a main control chip 30, an isolation driving circuit 40, and a power driving circuit 50.

[0058] In some embodiments, the high-voltage motor controller circuit board 100 can also include an external interface 10. The external interface 10 can also be provided on the high-voltage motor controller circuit board 100. The external interface 10 can be a connector structure for connecting the entire high-voltage motor controller circuit board to external signals, and can be used to input low-voltage electrical signals such as power signals, communication signals, and motor signals of the high-voltage motor controller circuit board 100.

[0059] The signal input end of the analog quantity acquisition circuit 20 is electrically connected to the external interface 10, and the signal output end of the analog quantity acquisition circuit 20 is electrically connected to the signal input end of the main control chip 30.

[0060] The analog quantity acquisition circuit 20 can be used to receive the motor analog signal of the high-voltage motor transmitted by the external interface 10, and to perform analog-to-digital conversion on the motor analog signal to obtain a motor digital signal.

[0061] The motor analog signal can be, for example, a resolver signal of a high-voltage motor, a motor temperature, etc., which is not limited herein. The analog quantity acquisition circuit 20 can be provided with an analog-to-digital converter and the like. In some embodiments, the analog quantity acquisition circuit 20 can also perform signal processing such as filtering and amplification on the motor analog signal, which is not strictly limited herein.

[0062] The first signal input end of the main control chip 30 is electrically connected to the output end of the analog quantity acquisition circuit 20. The main control chip 30 can receive the motor digital signal output by the analog quantity acquisition circuit 20 through the first signal input end, and generate a motor control signal for the high-voltage motor according to the motor digital signal, and output the motor control signal. The main control chip 30 can combine with software to implement motor control related algorithms to obtain the motor control signal.

[0063] The signal input end of the isolation driving circuit 40 can be electrically connected to the signal output end of the main control chip 30. The isolation driving circuit 40 can be used to receive the motor control signal output by the main control chip 30, and to perform isolation driving processing on the motor control signal to obtain a power driving signal.

[0064] The control end of the power drive circuit 50 is electrically connected with the signal output end of the isolation drive circuit 40, the signal output end of the power drive circuit 50 is electrically connected with the high-voltage motor, and the power drive circuit 50 is used for converting the direct-current voltage into alternating-current voltage according to the power drive signal, so as to convert the voltage signal of the direct-current bus into a three-phase alternating-current voltage signal, and drive the high-voltage motor to work according to the three-phase alternating-current voltage.

[0065] Compared with the prior art, the high-voltage motor controller circuit board 100 provided by the embodiment of the application has the analog quantity acquisition circuit 20, the main control chip 30, the isolation drive circuit 40 and the power drive circuit 50 integrated in the top layer. The analog quantity acquisition module receives the motor analog signal transmitted by the external interface 10 and converts the motor analog signal into a motor digital signal. The analog quantity acquisition module is connected with the main control chip 30. The main control chip 30 can receive the motor digital signal and output a motor control signal according to the motor digital signal. The isolation drive circuit 40 is electrically connected with the main control chip 30 and is used for performing isolation drive processing on the motor control signal to obtain a power drive signal. The power drive circuit 50 is electrically connected with the isolation drive circuit 40 and is used for converting the voltage signal of the direct-current bus into a three-phase alternating-current voltage signal according to the power drive signal, and driving the high-voltage motor to work according to the three-phase alternating-current voltage.

[0066] The high-voltage motor controller circuit board 100 provided by the embodiment of the application can effectively integrate the control board and the drive board, thereby optimizing the connection wire harness between systems and reducing the overall volume of the circuit board, improving the transverse space utilization rate of the motor controller circuit board, reducing the cost and improving the reliability of the high-voltage motor control drive.

[0067] Please see the following Figure 2 , Figure 2 is a structural schematic diagram of a high-voltage motor controller circuit board provided by another embodiment of the application. As shown in Figure 2 According to some embodiments of the application, optionally, in order to facilitate the reasonable power-on work of each functional module in the high-voltage motor controller circuit board 100, the top layer of the high-voltage motor controller circuit board 100 is further provided with a power management circuit 60 and a pre-drive isolation circuit 70.

[0068] The power signal input end of the power management circuit 60 is electrically connected with the external interface 10. The first power supply end of the power management circuit 60 is electrically connected with the analog quantity acquisition circuit 20. The second power supply end of the power management circuit 60 is electrically connected with the main control chip 30.

[0069] The power management circuit 60 can be used for receiving the external direct-current power signal transmitted by the external interface 10 and supplying power to the analog quantity acquisition circuit 20 and the main control chip 30 according to the external direct-current power signal.

[0070] The power signal input end of the pre-drive isolation circuit 70 is electrically connected with the third power supply end of the power management circuit 60, and the power signal output end of the pre-drive isolation circuit 70 is electrically connected with the isolation drive circuit 40.

[0071] The pre-drive isolation circuit 70 can be used to convert the first power voltage signal output by the third power supply end of the power management circuit 60 into a second power voltage signal, and transmit the second power voltage signal to the isolation drive circuit 40.

[0072] Please refer to the following Figure 3 , Figure 3 is a structural schematic diagram of a high-voltage motor controller circuit board provided in another embodiment of the present application. According to some embodiments of the present application, optionally, in order to fully ensure the stable and reliable operation of the high-voltage motor, it can be considered to timely monitor and judge the three-phase alternating voltage signal input to the high-voltage motor. Based on this, the high-voltage motor controller circuit board 100 can further include a current sensing circuit 80.

[0073] As shown in Figure 3 , the signal input end of the current sensing circuit 80 is electrically connected with the signal output end of the power drive circuit 50, and the signal output end of the current sensing circuit 80 is electrically connected with the second signal input end of the master control chip 30.

[0074] The current sensing circuit 80 can collect the three-phase alternating voltage signal output by the power drive circuit 50 through the signal input end thereof electrically connected with the signal output end of the power drive circuit 50, and transmit the comparison result of the three-phase alternating voltage signal to the master control chip 30 after comparing the three-phase alternating voltage signal with the first set voltage threshold.

[0075] In the embodiment, the current sensing circuit 80 can include a comparator, which can compare the collected three-phase alternating voltage signal with the first set voltage threshold to determine whether the working voltage of the high-voltage motor is overvoltage, undervoltage, etc.

[0076] After the current sensing circuit 80 transmits the comparison result of the three-phase alternating voltage signal to the master control chip 30, the master control chip 30 can further be used to output a motor control signal according to the comparison result. For example, if the comparison result indicates that the working voltage of the high-voltage motor is overvoltage, the speed of the high-voltage motor can be reduced, etc., which is not strictly limited in the present application.

[0077] According to some embodiments of the present application, optionally, more specifically, in order to facilitate more reasonable implementation of the circuit function of the current sensing circuit 80, the current sensing circuit 80 can specifically include a current sensor and a current signal processing circuit.

[0078] The signal input end of the current sensor is electrically connected with the signal output end of the power drive circuit 50, and the signal output end of the current sensor is electrically connected with the signal input end of the current signal processing circuit.

[0079] The signal output end of the current signal processing circuit is electrically connected with the second signal input end of the master control chip 30.

[0080] In specific work, the current sensor can collect the three-phase alternating voltage signal output by the power drive circuit 50 through the signal input end thereof electrically connected with the signal output end of the power drive circuit 50, and transmit the three-phase alternating voltage signal from the signal output end thereof to the current signal processing circuit.

[0081] After receiving the three-phase alternating voltage signal transmitted by the current sensor, the current signal processing circuit compares the three-phase alternating voltage signal with the first set voltage threshold, and transmits the comparison result to the master control chip 30.

[0082] In order to save the top layer wiring control of the high-voltage motor controller circuit board 100 and reduce the interlayer crosstalk, the current sensor is arranged on the bottom layer of the high-voltage motor controller circuit board 100, and the current signal processing circuit can be arranged on the top layer of the high-voltage motor controller circuit board 100.

[0083] According to some embodiments of the present application, optionally, in order to fully guarantee the power-on safety of the high-voltage motor controller circuit board 100, and thus fully guarantee the stable and reasonable operation of the motor system, the top layer of the high-voltage motor controller circuit board 100 can further be provided with an active discharge function circuit 90.

[0084] The control end of the active discharge function circuit 90 is electrically connected with the master control chip 30, the first end of the active discharge function circuit 90 is electrically connected with the DC bus, and the second end of the active discharge function circuit 90 is electrically connected with the ground end.

[0085] In specific work, for example, when the master control chip 30 determines that the DC bus voltage is abnormal, the active discharge function circuit 90 can be used to receive the enable signal of the master control chip 30, and discharge the DC bus according to the enable signal.

[0086] In the embodiment, when an emergency occurs, the master control chip 30 can send an enable signal to the active discharge function circuit, so that the active discharge function circuit controls the internal high-voltage discharge of the high-voltage motor controller circuit board 100, and reduces the voltage to below 60V, for example, to ensure high-voltage safety.

[0087] As a feasible example, the active discharge function circuit 90 can be composed of a large resistance and a switching element connected in series between the master chip 30 and the ground. The master chip 30 sends an enable signal to make the switching element in the normally open state close, so as to connect the large resistance into the high-voltage motor controller circuit board 100 for high-voltage discharge.

[0088] According to some embodiments of the present application, optionally, in order to ensure the high-voltage safety performance of the entire electric drive system under the 800V platform, special attention needs to be paid to the creepage distance between the high-voltage part and the low-voltage part during the process of component layout and wiring.

[0089] Based on this, a slot hole is arranged between the power drive circuit 50 and the DC bus on the top layer.

[0090] The slot hole is used to make the creepage distance between the power drive circuit 50 and the DC bus greater than or equal to a preset safety distance.

[0091] In the embodiment, by arranging the slot hole between the power drive circuit 50 and the DC bus, the creepage distance between the power drive circuit 50 and the DC bus is effectively extended through the slot hole, so that the electrical isolation between the high-voltage part and the low-voltage part in the high-voltage motor controller circuit board 100 can be fully ensured.

[0092] According to some embodiments of the present application, optionally, the intermediate layer can include a power layer (POWER layer). The power layer is arranged between the top layer and the bottom layer in the thickness direction of the high-voltage motor controller circuit board 100.

[0093] The power management circuit 60 supplies power to the analog quantity acquisition circuit 20, the master chip 30 and the pre-drive isolation circuit 70 in a copper paving manner on the power layer.

[0094] In the embodiment, the power management circuit 60 in the high-voltage motor controller circuit board 100 is used to connect each power network for supplying power to each functional module in a copper paving manner. The copper width needs to meet the overcurrent capacity, so as to ensure the stability of the power supply of the power management circuit 60 and reduce the current overcurrent loss.

[0095] According to some embodiments of the present application, optionally, more specifically, the intermediate layer can further include a signal layer (SIGNAL layer). The signal layer is arranged between the top layer and the power layer in the thickness direction of the high-voltage motor controller circuit board 100.

[0096] The master chip 30 and the isolation drive circuit 40 are electrically connected through a first wiring, and at least part of the first wiring is arranged on the signal layer.

[0097] In the embodiment, considering that the signals transmitted between the master chip 30 and the isolation driving circuit 40 are high-speed signals or sensitive signals, the signal lines between the master chip 30 and the isolation driving circuit 40 are arranged on the signal layer, which is mainly used for the high-speed signal and sensitive signal lines in the motor controller, so as to improve the signal anti-interference performance.

[0098] According to some embodiments of the present application, optionally, the direction of the lines in the power supply layer is a first direction, and the direction of the lines in the signal layer is a second direction. The first direction and the second direction are orthogonal, or the included angle between the first direction and the second direction is in a preset range.

[0099] In the embodiment, the preset range can be determined according to actual line requirements. For example, the preset range can be set to about ninety degrees. In this way, by arranging the power supply layer lines and the signal layer lines to be orthogonal as much as possible, the interlayer crosstalk between the power supply layer and the signal layer can be effectively improved.

[0100] In addition, it should be noted that in some other embodiments, in addition to the signal layer and the power supply layer, a ground layer can also be arranged in the middle layer. For example, the middle layer of the high-voltage motor controller circuit board 100 can be sequentially arranged with a ground layer, a signal layer, a ground layer and a power supply layer from top to bottom, which is not strictly limited in the embodiment.

[0101] According to some embodiments of the present application, optionally, the bottom layer of the high-voltage motor controller circuit board 100 further comprises:

[0102] a DC bus monitoring circuit, a signal input end of the DC bus monitoring circuit is electrically connected with the DC bus, and a signal output end of the DC bus monitoring circuit is electrically connected with the master chip 30;

[0103] The DC bus monitoring circuit is used for sampling the voltage signal on the DC bus and performing a target operation when the voltage signal exceeds a second set voltage threshold.

[0104] In the embodiment, by arranging the DC bus monitoring circuit in the bottom layer of the high-voltage motor controller circuit board 100, the voltage signal on the DC bus can be sampled in time, and whether the voltage signal on the DC bus is overvoltage can be detected, so as to fully guarantee the normal input of the DC bus voltage and prevent the circuit board and power devices from being damaged by overvoltage.

[0105] It should be noted that the target operation can be, for example, a cut-off operation of the DC bus and the power driving circuit 50, which can be used to guarantee the safety of the high-voltage motor controller circuit board, which is not strictly limited in the embodiment.

[0106] For the high-voltage motor controller circuit board provided in the embodiments of the present application, some specific examples are introduced below. Please see Figure 4 , Figure 4 is a structural schematic diagram of a high-voltage motor controller circuit board provided in another embodiment of the present application. According to some embodiments of the present application, the entire 800V high-voltage motor controller circuit is composed of two parts, a control part circuit and a drive part circuit.

[0107] The control part circuit includes a low-voltage electrical interface / motor interface (corresponding to the aforementioned external interface 10), a power management circuit, an analog quantity acquisition circuit, a main control chip, and a current sensing circuit. The drive part circuit includes a pre-drive isolation power supply (corresponding to the aforementioned pre-drive isolation circuit), an isolation drive circuit, and a power module three-phase bridge (corresponding to the aforementioned power drive circuit). The external DC power supply is input by the low-voltage electrical interface and connected to the power management circuit. The output end of the power management circuit is connected to each functional module of the high-voltage motor controller circuit board, for powering the entire circuit. The motor signal (the aforementioned motor analog signal) is input by the motor interface and connected to the analog quantity acquisition circuit. The output end of the analog quantity acquisition circuit is connected to the input end of the main control chip.

[0108] The main control chip receives the motor signal processed by the analog quantity acquisition circuit, performs motor control related algorithms in combination with software, and generates a motor control signal corresponding to the motor signal. The motor control signal is transmitted by the main control chip to the isolation drive circuit to perform gate drive on the power module three-phase bridge, realize high-voltage DC (Direct Current) / AC (Alternating Current) inversion, and finally realize control on the high-voltage motor.

[0109] Please see Figure 5 , Figure 5 is a top layer structural schematic diagram of a high-voltage motor controller circuit board provided in an embodiment of the present application. As shown in Figure 5 , Figure 5It is the TOP layer structure of the whole high-voltage motor controller circuit board PCB, wherein 1-6 are control part circuits, and 7-10 are drive part circuits. 1 is a connector structure for connecting the whole circuit board with external signals, realizing the input of low-voltage electrical signals such as power supply signals, communication signals and motor signals, that is, the aforementioned external interface. 2 is a circuit for communication between the controller and the whole vehicle, containing two-way CAN (Controller Area Network) communication function, which can realize the sleep and wake-up of the power management chip. 3 is an analog quantity acquisition circuit for motor analog signals, which is used for AD sampling of motor resolver signals, motor temperature and the like. 4 is a power management circuit, external DC voltage input is converted into a series of voltage signals through BOOST / BUCK / LDO circuits, which is used for power supply of other circuits in the control part and pre-drive isolation circuit. 5 is a current sensing circuit, which is used for collecting three-phase AC output of the motor, comparing with the set voltage threshold, judging whether the three-phase output of the motor is overvoltage or undervoltage; 6 is the main control chip and peripheral circuit in the whole high-voltage motor controller circuit board, which is combined with software to analyze and process the collected communication signals, motor signals and sensor signals, and outputs corresponding control signals to realize accurate control and function safety protection of the motor.

[0110] Figure 5In the middle, 7, 8, 9 are isolated driving circuits of power devices, including UVW three-phase, a total of six bridge arms, since the schematic diagram of each phase circuit and the upper and lower bridge arms are the same, and the components are all symmetrical layout, here taking the lower bridge arm of 7 as an example for description, 71 is a pre-drive isolation circuit, the power management circuit 4 in the control part circuit inputs a voltage signal to 71, after the push-pull amplification of the transformer driver chip of 71, the positive and negative voltage output by the transformer is used to supply power to the high voltage side of the pre-drive chip (corresponding to the aforementioned isolated driving circuit) shown by 72, to realize the gate drive of the power device, the low voltage side of the pre-drive chip receives the motor control signal output from the main control chip, at the same time, the high voltage side power voltage, power device temperature and the like are sampled and measured, and are provided to the main control chip to make motor control algorithm, to ensure the normal drive and functional safety of the power device. Among them, according to the requirement of GB / T4943 safety regulations, in order to ensure the high voltage safety performance of the entire electric drive system under the 800V platform, special attention should be paid to the creepage distance between the high voltage part and the low voltage part in the process of component layout and wiring. Mainly including the creepage distance between the control circuit part and the driving circuit part, and the creepage distance between the high voltage side and the low voltage side of the driving circuit part. All the wiring, via and copper of the control circuit part need to be away from the high voltage side of the isolated driving circuit 7 by more than or equal to 7mm creepage distance, 73 is a slot hole opened to ensure the electrical clearance between the high voltage side and the low voltage side of the driving part.

[0111] Please refer to Figure 6 , Figure 6 is a bottom layer structure schematic diagram of a high-voltage motor controller circuit board provided by another embodiment of the application. As Figure 6 shown, in this BOTTOM layer, 1 is a DC bus monitoring circuit, which can be used for voltage sampling, overvoltage monitoring, so as to ensure the normal input of DC bus voltage and prevent overvoltage damage to the circuit board and power devices.

[0112] 2 is a current sensor layout area, no other components are arranged at the bottom of this area to ensure reliable welding of the current sensor and the circuit board. At the same time, the test points on the high-voltage motor controller circuit board can be set on the bottom layer as much as possible to facilitate process production test.

[0113] In this embodiment, by reasonably arranging the components in the TOP layer and the BOTTOM layer, the space in the board can be saved, and the wiring path can be optimized.

[0114] Please refer to Figure 7 , Figure 7 is a power layer structure schematic diagram of a high-voltage motor controller circuit board provided by another embodiment of the application. Figure 7The PWR layer structure is the PWR layer structure of the whole high-voltage motor controller PCB. The layer mainly connects various power supply networks on the circuit board in a copper paving manner. The width of the copper skin needs to meet the overcurrent capacity to ensure the stability of the power supply.

[0115] Please refer to Figure 8 , Figure 8 is a signal layer structure diagram of a high-voltage motor controller circuit board provided by another embodiment of the application. Figure 8 The SIG layer structure is the SIG layer structure of the whole high-voltage motor controller PCB. The layer is mainly used for high-speed signals and sensitive signal wires in the motor controller to improve the signal anti-interference performance. The PWR layer and the SIG wire direction are orthogonal as much as possible to reduce the crosstalk between layers.

[0116] The application integrates the control part and the driving part of the high-voltage motor controller on a complete circuit board to realize the control and driving integration of the high-voltage motor. The system connection line bundle can be reduced, the structural complexity and transmission energy loss can be reduced, the precise control of the motor by the electric drive system can be realized, and a series of technical requirements of the 800V high-voltage platform can be met.

[0117] It can be understood that the above are all examples and do not substantially limit the high-voltage motor controller circuit board 100 protected by the application.

[0118] Overall, compared with the prior art, the high-voltage motor controller circuit board 100 of the embodiment of the application can effectively integrate the control board and the driving board, thereby optimizing the system connection line bundle, reducing the overall volume of the circuit board, improving the lateral space utilization rate of the motor controller circuit board, reducing the cost, and improving the reliability of the high-voltage motor control and driving.

[0119] The functional blocks shown in the structure block diagram described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, etc. When implemented in software, the elements of the application are program or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. The "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of the machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc.

[0120] It should be noted that, as used herein, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0121] It should be noted that each of the above - described embodiments can be implemented in the form of a computer program or programs. That is, the embodiments described above can be implemented by using a computer program or programs executing on one or more programmable computers (e.g., computers, processing units or processor devices) having network browsing capabilities. Each computer program can be stored on a storage medium, which can comprise random access memory (RAM), read only memory (ROM), magnetic disk or optical disk, etc., readable by a general or special purpose computer or processor. The storage medium can be tangible and / or non-transitory. The computer program can be started by the data signal representing any of the intended processes, methods, articles or apparatuses recited above, which is supplied to the computer from the storage medium.

[0122] The principles and implementations of the present application have been described above with the specific examples. The above descriptions of the examples are only intended to help understand the method of the present application and its core idea. The above are only the preferred embodiments of the present application. It should be noted that, due to the limited nature of the language, there are objectively infinite specific structures. For ordinary skilled persons in the art, without departing from the principles of the present application, some improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner. These improvements, refinements, changes or combinations, or the direct application of the concepts and technical solutions of the present application to other fields without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A high voltage motor controller circuit board, characterized by, The high-voltage motor controller circuit board comprises a top layer, a middle layer and a bottom layer arranged in sequence in the thickness direction; the top layer and the bottom layer are electrically connected through the middle layer; The top layer is provided with: an analog quantity acquisition circuit, a signal input end of the analog quantity acquisition circuit is electrically connected with an external interface, a signal output end of the analog quantity acquisition circuit is electrically connected with a signal input end of a main control chip, the analog quantity acquisition circuit is used for receiving motor analog signals of a high-voltage motor transmitted by the external interface, and the motor analog signals are converted into motor digital signals through analog-digital conversion; a main control chip, a first signal input end of the main control chip is electrically connected with an output end of the analog quantity acquisition circuit, and the main control chip is used for generating motor control signals of the high-voltage motor according to the motor digital signals; an isolation driving circuit, a signal input end of the isolation driving circuit is electrically connected with a signal output end of the main control chip, and the isolation driving circuit is used for performing isolation driving processing on the motor control signals to obtain power driving signals; a power driving circuit, a control end of the power driving circuit is electrically connected with a signal output end of the isolation driving circuit, a signal output end of the power driving circuit is electrically connected with the high-voltage motor, and the power driving circuit is used for converting voltage signals of a direct-current bus into three-phase alternating voltage signals according to the power driving signals and driving the high-voltage motor to work according to the three-phase alternating voltage.

2. The high voltage motor controller circuit board of claim 1, wherein, The top layer of the high-voltage motor controller circuit board is further provided with: a power management circuit, a power signal input end of the power management circuit is electrically connected with the external interface, a first power supply end of the power management circuit is electrically connected with the analog quantity acquisition circuit, and a second power supply end of the power management circuit is electrically connected with the main control chip; the power management circuit is used for receiving external direct-current power signals transmitted by the external interface and supplying power to the analog quantity acquisition circuit and the main control chip according to the external direct-current power signals; a pre-driving isolation circuit, a power signal input end of the pre-driving isolation circuit is electrically connected with a third power supply end of the power management circuit, and a power signal output end of the pre-driving isolation circuit is electrically connected with the isolation driving circuit; the pre-driving isolation circuit is used for converting a first power voltage signal output by the third power supply end of the power management circuit into a second power voltage signal and transmitting the second power voltage signal to the isolation driving circuit.

3. The high voltage motor controller circuit board of claim 2, wherein, The middle layer comprises a power supply layer; the power supply layer is arranged between the top layer and the bottom layer in the thickness direction of the high-voltage motor controller circuit board; the power management circuit supplies power to the analog quantity acquisition circuit, the main control chip and the pre-driving isolation circuit in a copper-laying manner in the power supply layer.

4. The high voltage motor controller circuit board of claim 3, wherein, The middle layer further comprises a signal layer; the signal layer is arranged between the top layer and the power supply layer in the thickness direction of the high-voltage motor controller circuit board; the main control chip and the isolation driving circuit are electrically connected through a first wiring, and at least part of the first wiring is arranged in the signal layer.

5. The high voltage motor controller circuit board of claim 4, wherein, The trace direction in the power supply layer is a first direction, and the trace direction in the signal layer is a second direction; The first direction and the second direction are orthogonal, or the included angle between the first direction and the second direction is in a preset range.

6. The high voltage motor controller circuit board of claim 1, wherein, The high-voltage motor controller circuit board further comprises: A current sensing circuit, a signal input end of the current sensing circuit is electrically connected with a signal output end of the power drive circuit, and a signal output end of the current sensing circuit is electrically connected with a second signal input end of the main control chip; The current sensing circuit is used for collecting three-phase alternating voltage signals output by the power drive circuit, and transmitting a comparison result of the three-phase alternating voltage signals to the main control chip after comparing the three-phase alternating voltage signals with a first set voltage threshold; The main control chip is further used for outputting the motor control signal according to the comparison result.

7. The high voltage motor controller circuit board of claim 6, wherein, The current sensing circuit comprises a current sensor and a current signal processing circuit; a signal input end of the current sensor is electrically connected with a signal output end of the power drive circuit, a signal output end of the current sensor is electrically connected with a signal input end of the current signal processing circuit, and a signal output end of the current signal processing circuit is electrically connected with a second signal input end of the main control chip; The current sensor is used for collecting three-phase alternating voltage signals output by the power drive circuit, and transmitting the three-phase alternating voltage signals to the current signal processing circuit; The current signal processing circuit is used for transmitting a comparison result to the main control chip after comparing the three-phase alternating voltage signals with a first set voltage threshold; The current sensor is arranged on a bottom layer of the high-voltage motor controller circuit board, and the current signal processing circuit is arranged on a top layer of the high-voltage motor controller circuit board.

8. The high voltage motor controller circuit board of claim 1, wherein, The bottom layer of the high-voltage motor controller circuit board further comprises: A DC bus monitoring circuit, a signal input end of the DC bus monitoring circuit is electrically connected with the DC bus, and a signal output end of the DC bus monitoring circuit is electrically connected with the main control chip; The DC bus monitoring circuit is used for sampling a voltage signal on the DC bus, and performing a target operation when the voltage signal exceeds a second set voltage threshold.

9. The high voltage motor controller circuit board of claim 1, wherein, The top layer of the high-voltage motor controller circuit board further comprises: An active discharge function circuit, a control end of the active discharge function circuit is electrically connected with the main control chip, a first end of the active discharge function circuit is electrically connected with the DC bus, and a second end of the active discharge function circuit is electrically connected with a ground end; The active discharge function circuit is used for receiving an enable signal of the main control chip, and discharging the DC bus according to the enable signal.

10. The high voltage motor controller circuit board of claim 1, wherein, A slot hole is arranged between the power drive circuit and the DC bus on the top layer; The slot hole is used for making a creepage distance between the power drive circuit and the DC bus greater than or equal to a preset safety distance.

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