A high-reliability motor driver with redundancy design

Abstract

The utility model relates to technical field of motor driver, concretely relates to a kind of high reliability motor driver using redundancy design, technical solution main point includes including single-chip microcontroller module circuit, first inverter drive circuit, first bridge inverter circuit, second inverter drive circuit, second bridge inverter circuit, and output switching circuit, the output end of output switching circuit is used to connect motor, first inverter drive circuit connects first bridge inverter circuit and is used to provide X2 line output, first inverter drive circuit connects first bridge inverter circuit and is used to provide X1 line output, X1 line output and X2 line output are selected one way through output switching circuit and connect motor, single-chip microcontroller module circuit output single signal S0 and are used to control output switching circuit, single signal S0 initial state is virtual signal.The utility model improves work reliability by redundancy design.

Description

Technical Field

[0001] This utility model relates to the technical field of motor drivers, and specifically to a high-reliability motor driver with redundant design. Background Technology

[0002] In existing technologies, the reliability of variable frequency pump drives becomes crucial in applications requiring high-reliability pumps, such as chemical and fire-fighting industries. The inverter circuit section has the highest failure rate in frequency converters. Conventional frequency converter drivers use a basic three-phase full-bridge design; if any half-bridge fails, the entire pump becomes unusable.

[0003] Therefore, how to solve the above problems has become a technical challenge.

[0004] In the prior art, Chinese patent document application number 202410231736.3 discloses a redundant drive system and a control method for online switching of backup drives. The redundant drive system includes: a first controller connected to a host computer; a first drive and a second drive connected to the first controller; a first motor connected to the first drive and the second drive, wherein a first drive switching contactor is connected in series on the connection line between the first motor and the first drive, and a second drive switching contactor is connected in series on the connection line between the first motor and the second drive; and the first controller acquires the current state of each drive and each drive switching contactor in real time, and generates corresponding drive switching commands based on the current state. The drive switching commands are used to control the opening and closing actions of the first drive switching contactor and the second drive switching contactor. The first drive switching contactor and the second drive switching contactor are configured such that only one of them can be closed simultaneously.

[0005] As can be seen from the above scheme, the redundant design can significantly improve the reliability of the water pump inverter driver. However, during the modification of the redundant design scheme for the water pump inverter driver, it was found that the inverter circuit needs to be set up with two independent inverters, thus requiring two independent drive components to complete the drive. How to achieve the switching between the two sets of inverters requires consideration of the microcontroller control pin resources. If directly controlled by a microcontroller independently, two microcontrollers are required, which is costly. If a single microcontroller is used, the pin resources are insufficient, making effective control impossible. Therefore, the problem to be solved is, given the above situation, how to effectively achieve redundant control and improve the reliability of redundant switching control while saving costs and microcontroller resources. Utility Model Content

[0006] To address the technical problems and shortcomings of existing technologies, this invention provides a high-reliability motor driver with a redundant design. This driver overcomes the limitations of single-chip microcontroller pin resources, further avoids signal faults and interference in redundant control, improves the reliability of redundant switching control, and solves the technical problem of unstable chip signals in redundant control.

[0007] To achieve the above and other related objectives, the present invention adopts the following technical solution:

[0008] A high-reliability motor driver with redundant design includes a microcontroller module circuit, a first inverter drive circuit, a first bridge inverter circuit, a second inverter drive circuit, a second bridge inverter circuit, and an output switching circuit. The output terminal of the output switching circuit is used to connect to the motor. The first inverter drive circuit is connected to the first bridge inverter circuit to provide X2 line output, and the first inverter drive circuit is also connected to the first bridge inverter circuit to provide X1 line output. The X1 line output and the X2 line output are selected by the output switching circuit to connect one of them to the motor. The microcontroller module circuit is connected to the first inverter drive circuit through a first driver chip and to the second inverter drive circuit through a second driver chip. The first driver chip and the second driver chip are connected to the microcontroller module circuit via the same pin group.

[0009] The microcontroller module circuit outputs a single signal S0 and uses it to control the output switching circuit. The single signal S0 is initially a virtual signal.

[0010] Preferably, the output switching circuit includes resistor R3, resistor R4, transistor Q1, and relay. One end of resistor R3 serves as the signal output terminal, the other end of resistor R3 is connected to the base of transistor Q1 and one end of resistor R4, the other end of resistor R4 is connected to the emitter of transistor Q1 and grounded, the collector of transistor Q1 is connected to one end of the relay coil, and the other end of the relay coil is connected to a 12V voltage source. The relay switch is used to control the output of line X1 or line X2.

[0011] Preferably, the microcontroller module circuit is further connected to the output switching circuit through a switching control circuit. The switching control circuit includes a filter section, an OR gate circuit B1, an OR gate circuit B2, an NOT gate circuit A1, an NOT gate circuit A2, and an NOT gate circuit A3. One pin of the microcontroller module circuit inputs a signal to the input terminal of the NOT gate circuit A2 through the filter section. The output terminal of the NOT gate circuit A2 is connected to the input terminal of the NOT gate circuit A1, one input terminal of the OR gate circuit B2, and the input terminal of the NOT gate circuit A3. The other input terminals of the OR gate circuit B2 and the OR gate circuit B1 are connected together as a protection signal input terminal to receive the protection signal Ss. The output terminal of the OR gate circuit B1 outputs the control signal S1, the output terminal of the OR gate circuit B2 outputs the control signal S2, and the output terminal of the NOT gate circuit A3 controls the output switching circuit.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model employs a redundant design with independent first and second driver chips, thereby sharing six pins (PWMUH, PWMUL, PWMVH, PWMVL, PWMWH, and PWMWL) on the microcontroller module circuit. This saves pin resources of the microcontroller chip. Compared to using two microcontroller chips or one microcontroller chip with twelve pins, the solution in this application is more pin-efficient. Through this redundant structure, the working performance is more stable and reliable. If one line fails, the backup line can be switched to work. For example, if the X1 line output fails, the X2 line output can be selected to work, improving the reliability of operation.

[0014] 2. In this utility model, for the output switching circuit, only one microcontroller pin is used, and a filter circuit is used to stabilize the signal. At the same time, signal processing is performed according to different logic gate circuits, which not only realizes the delay adjustment and logic control in the circuit transmission process, but also makes the signal control stable and reliable.

[0015] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram illustrating the overall principle of an embodiment of this application;

[0018] Figure 2 This is a circuit example diagram of an embodiment of this application;

[0019] Figure 3 This is a key circuit diagram of the improved part of the embodiment of this application.

[0020] Explanation of reference numerals for major components:

[0021] 100. Microcontroller module circuit; 200. First inverter drive circuit; 300. First bridge inverter circuit; 400. Second inverter drive circuit; 500. Second bridge inverter circuit; 600. Output switching circuit; 700. Switching control circuit; 701. Filtering unit; 801. First driver chip; 802. Second driver chip. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The following specific examples illustrate the embodiments of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be changed at will, and the layout of the components may also be more complex.

[0024] It should be noted that in the description of this application, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention. Furthermore, it should be noted that in the description of this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the invention based on the specific circumstances.

[0025] Example:

[0026] The present invention discloses a high-reliability motor driver with redundant design, including a microcontroller module circuit 100, a first inverter drive circuit 200, a first bridge inverter circuit 300, a second inverter drive circuit 400, a second bridge inverter circuit 500, and an output switching circuit 600.

[0027] The first inverter drive circuit 200 and the first bridge inverter circuit 300 protect the first bridge inverter circuit 300, the second inverter drive circuit 400, and the second bridge inverter circuit 500, and adopt a three-phase bridge inverter design.

[0028] The switching control circuit 700 determines which circuit to use. If one circuit malfunctions, the microcontroller switches to the other circuit via the switching control circuit 700 to continue operation.

[0029] Figure 1 In this circuit, the microcontroller module 100 consists of the microcontroller and its peripheral circuits, forming the core processing unit of the inverter driver. It primarily comprises the microcontroller and necessary reset circuits. The inverter drive circuit drives the power devices in the inverter circuit. A commonly used circuit is a half-bridge driver chip. The microcontroller generates six PWM signals to enhance the inverter drive circuit's ability to drive the power devices, thereby driving the motor.

[0030] The output terminal of the output switching circuit 600 is used to connect to the motor. The first inverter drive circuit 200 is connected to the first bridge inverter circuit 300 to provide the X2 line output, and the first inverter drive circuit 200 is also connected to the first bridge inverter circuit 300 to provide the X1 line output. The X1 line output and the X2 line output are selected by the output switching circuit 600 to connect one of them to the motor. The microcontroller module circuit 100 is connected to the first inverter drive circuit 200 through the first driver chip 801, and to the second inverter drive circuit 400 through the second driver chip 802. The first driver chip 801 and the second driver chip 802 are connected to the microcontroller module circuit 100 via the same pin group. The microcontroller module circuit 100 outputs a single signal S0 to control the output switching circuit 600. The single signal S0 is initially a dummy signal. The dummy signal is a low-level chip, which reduces power consumption.

[0031] The drive switching circuit is used to switch which of the six PWM signals drives which group of inverter circuits. The detection circuit is used to detect current, voltage, and position, and to detect the parameters of motor operation for use by the microcontroller. This part is a conventional circuit, modified from an existing module that was not aligned.

[0032] Specifically, in combination Figure 2 and Figure 3 Understandably, the output switching circuit 600 includes resistors R3 and R4, transistor Q1, and a relay. One end of resistor R3 serves as the signal output terminal, and the other end of resistor R3 is connected to the base of transistor Q1 and one end of resistor R4. The other end of resistor R4 is connected to the emitter of transistor Q1 and grounded. The collector of transistor Q1 is connected to one end of the relay coil, and the other end of the relay coil is connected to a 12V voltage source. The relay switch is used to control the output of line X1 or line X2.

[0033] Specifically, the microcontroller module circuit 100 is also connected to the output switching circuit 600 through the switching control circuit 700. The switching control circuit 700 includes a filter section 701, an OR gate circuit B1, an OR gate circuit B2, an NOT gate circuit A1, an NOT gate circuit A2, and an NOT gate circuit A3. One pin of the microcontroller module circuit 100 inputs a signal to the input terminal of the NOT gate circuit A2 through the filter section 701. The output terminal of the NOT gate circuit A2 is connected to the input terminal of the NOT gate circuit A1, one input terminal of the OR gate circuit B2, and the input terminal of the NOT gate circuit A3. The other input terminals of the OR gate circuit B2 and the OR gate circuit B1 are connected together as a protection signal input terminal to receive the protection signal Ss. The output terminal of the OR gate circuit B1 outputs the control signal S1, the output terminal of the OR gate circuit B2 outputs the control signal S2, and the output terminal of the NOT gate circuit A3 controls the output switching circuit 600.

[0034] Several microcontrollers are available that can meet the requirements of motor drive; in this application, we used the FS026C7L. Using the microcontroller as the core, it generates six PWM signals for motor drive and analyzes voltage, current, and position signals to achieve motor drive, fault detection, and protection functions. The circuit includes two independent inverter circuits, each composed of six power semiconductor devices, typically IGBTs or MOSFETs, or a module consisting of six devices. The two inverter circuits are driven by two independent drive units, using conventional half-bridge or full-bridge drive circuits.

[0035] To achieve the switching between the two sets of inverters, the six PWM signals generated by the microcontroller are sent to an integrated circuit (or other similar functional circuits) via two 74LS367 chips, namely the first driver chip 801 and the second driver chip 802, to control the input signals of the two sets of inverter drive circuits respectively. These two chips cannot work simultaneously; this is achieved by the switching control circuit 700. Hardware-wise, these two sets are mutually exclusive. If the microcontroller's IO1 outputs a low level S0, the signal connected to the 1G and 2G ports of the first driver chip 801 after passing through NOT gates B and A will still be low. At this time, the first driver chip 801 is turned on, allowing the six PWM signals to pass through. The upper set of inverter circuits is now active, while the other signal becomes high after passing through NOT gate B, disabling the output of the second driver chip 802, and the lower set of inverter circuits is inactive. When the microcontroller's IO1 outputs a high level, the output connected to the 1G and 2G ports of the first driver chip 801 after passing through NOT gate circuit B and NOT gate circuit A will still be at a high level. At this time, the first driver chip 801 is disabled from outputting, and the upper set of inverter circuits does not work. Meanwhile, the other path becomes low level after passing through NOT gate circuit B, and the second driver chip 802 is allowed to output, and the lower set of inverter circuits works.

[0036] While each inverter group is active, relay RELAY1 also switches simultaneously to ensure the motor is connected to an effective inverter circuit. Specifically: When IO1 outputs a low level (S0), the upper inverter group is active. At this time, the base of the transistor is low, the transistor is not conducting, the relay does not operate, and the normally closed contact connects the motor to the upper inverter circuit. Similarly, when IO1 outputs a high level, the transistor conducts, the relay operates, and the relay switches the motor to the lower inverter circuit.

[0037] The signal from the external detection circuit can also be used for protection. The protection signal Ss generated by this part of the detection circuit is output to the OR gate circuit, which works together with the S0 signal of the microcontroller's output pin IO1. When an abnormal signal is generated, the protection signal outputs a high level. At this time, the drive of both the upper and lower inverter circuits is blocked and they do not work.

[0038] exist Figure 3 As can be seen, the filter section 701 is composed of resistors R1 and C1, which can stabilize the signal S0.

[0039] Therefore, this utility model utilizes independent first driver chip 801 and second driver chip 802 for redundant design, thus sharing six pins (PWMUH, PWMUL, PWMVH, PWMVL, PWMWH, and PWMWL) on the microcontroller module circuit 100. This saves pin resources of the microcontroller chip. Compared to using two microcontroller chips or one microcontroller chip with twelve pins, the solution in this application is more pin-efficient. This redundant structure results in more stable and reliable operation. If one output fails, the backup output can be switched to work. For example, if line X1 fails, line X2 can be selected to operate, improving reliability. The output switching circuit 600 uses only one microcontroller pin and employs a filter circuit for signal stabilization. Furthermore, it performs signal processing based on different logic gates, achieving delay adjustment and logic control during circuit transmission, ensuring stable and reliable signal control.

[0040] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-reliability motor driver with redundant design, comprising a microcontroller module circuit (100), a first inverter drive circuit (200), a first bridge inverter circuit (300), a second inverter drive circuit (400), a second bridge inverter circuit (500), and an output switching circuit (600), wherein the output terminal of the output switching circuit (600) is used to connect to a motor, the first inverter drive circuit (200) is connected to the first bridge inverter circuit (300) to provide X2 line output, the first inverter drive circuit (200) is connected to the first bridge inverter circuit (300) to provide X1 line output, and the X1 line output and X2 line output are selected by the output switching circuit (600) to connect one of them to the motor, characterized in that, The microcontroller module circuit (100) is connected to the first inverter drive circuit (200) through the first driver chip (801) and to the second inverter drive circuit (400) through the second driver chip (802). The first driver chip (801) and the second driver chip (802) are connected to the microcontroller module circuit (100) via the same pin group. The microcontroller module circuit (100) outputs a single signal S0 and is used to control the output switching circuit (600). The single signal S0 is initially a virtual signal.

2. A high-reliability motor driver with redundant design according to claim 1, characterized in that, The output switching circuit (600) includes resistors R3 and R4, transistor Q1, and a relay. One end of resistor R3 serves as the signal output terminal, and the other end of resistor R3 is connected to the base of transistor Q1 and one end of resistor R4. The other end of resistor R4 is connected to the emitter of transistor Q1 and grounded. The collector of transistor Q1 is connected to one end of the relay coil, and the other end of the relay coil is connected to a 12V voltage source. The relay switch is used to control the output of line X1 or line X2.

3. A high-reliability motor driver with redundant design according to claim 2, characterized in that, The microcontroller module circuit (100) is also connected to the output switching circuit (600) through a switching control circuit (700). The switching control circuit (700) includes a filter section (701), an OR gate circuit B1, an OR gate circuit B2, an NOT gate circuit A1, an NOT gate circuit A2, and an NOT gate circuit A3. One pin of the microcontroller module circuit (100) inputs a signal to the input terminal of the NOT gate circuit A2 through the filter section (701). The output terminal is connected to the input terminal of the NOT gate circuit A1, one input terminal of the OR gate circuit B2, and the input terminal of the NOT gate circuit A3. The other input terminals of the OR gate circuit B2 and the OR gate circuit B1 are connected together as the protection signal input terminal to receive the protection signal Ss. The output terminal of the OR gate circuit B1 outputs the control signal S1, the output terminal of the OR gate circuit B2 outputs the control signal S2, and the output terminal of the NOT gate circuit A3 controls the output switching circuit (600).

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