Motor driver

Abstract

The utility model discloses a motor driver. The motor driver comprises a power supply access module, a first rectification module, an inversion module, a second rectification module and a driving control module. The power supply access module is used for respectively outputting alternating current output by an external alternating current power supply to the first rectification module and the second rectification module. The first rectification module is used for outputting a first direct current obtained by rectifying an alternating current to the inversion module, and the second rectification module is used for outputting a second direct current obtained by rectifying the alternating current to the driving control module. The working power supply for motor control is independently established, and electric energy is not obtained from the direct current bus, so that when the power supply circuit for supplying power to the driving control module is designed, reverse interference on the direct current bus due to motor work does not need to be considered, and the design difficulty and the production cost of the power supply circuit are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial automation, in particular to a motor driver. BACKGROUND

[0002] Motor drivers play a crucial role in the field of industrial automation, as they are responsible for driving and controlling the operation of motors, thereby enabling various automation tasks. Motor drivers can receive control signals from a control system (such as a programmable logic controller, PLC) and control the start, stop, acceleration, deceleration, and direction of the motor based on these signals. In the prior art, the power conversion circuit used to supply power to the controller of the motor driver obtains power from the DC bus that drives the motor. When the motor is operating, it will cause a voltage pump-up phenomenon on the DC bus, which will have a negative impact on the power conversion circuit, thereby reducing the reliability of the power conversion circuit. CONTENT OF THE INVENTION

[0003] The technical problem to be solved by the present application is how to improve the reliability of the power supply for the controller of the motor driver.

[0004] According to a first aspect, in one embodiment, a motor driver is provided, comprising a power access module, a first rectification module, an inverter module, a second rectification module, and a drive control module;

[0005] The power access module is connected to the first rectification module and the second rectification module, respectively, for outputting AC power from an external AC power supply to the first rectification module and the second rectification module, respectively;

[0006] The input end of the first rectification module is connected to the power access module, and the output end is connected to the inverter module, for rectifying the AC power and outputting the first DC power obtained by rectification as the power supply for the inverter module;

[0007] The input end of the second rectification module is connected to the power access module, and the output end is connected to the drive control module, for rectifying the AC power and outputting the second DC power obtained by rectification as the power supply for the drive control module.

[0008] In one embodiment, the motor driver further comprises a filter module connected between the first rectification module and the inverter module, for stabilizing and filtering the first DC power.

[0009] In one embodiment, the drive control module comprises a power conversion circuit, a controller, and a drive circuit.

[0010] The power conversion circuit is connected with the second rectifier module and the controller respectively, and is configured to convert the second direct current into third direct current, and use the third direct current as the working power supply of the controller.

[0011] The controller is connected with the drive circuit, and is configured to send a pulse control signal to the drive circuit.

[0012] The drive circuit is connected with the inverter module, and is configured to control the switching of the switching tube on the inverter bridge arm of the inverter module after amplifying the pulse control signal.

[0013] In an embodiment, the second rectifier module comprises a half-bridge rectifier circuit or a full-bridge rectifier circuit.

[0014] In an embodiment, when the second rectifier module comprises the half-bridge rectifier circuit, the half-bridge rectifier circuit comprises a first diode D11 and a second diode D12; the anodes of the first diode D11 and the second diode D12 are configured to be input terminals of the alternating current output by the alternating current power supply, and the cathodes of the first diode D11 and the second diode D12 are electrically connected and configured to be output terminals of the second direct current.

[0015] In an embodiment, the half-bridge rectifier circuit further comprises a first capacitor C10; one end of the first capacitor C10 is connected with the cathode of the first diode D11, and the other end is grounded.

[0016] In an embodiment, the first rectifier module comprises a full-bridge rectifier circuit and a second capacitor C20.

[0017] The full-bridge rectifier circuit comprises an alternating current first connection end, an alternating current second connection end, a direct current output positive connection end, a direct current output negative grounding end, a third diode D21, a fourth diode D22, a fifth diode D23 and a sixth diode D24; the alternating current first connection end and the alternating current second connection end are configured to be input terminals of the alternating current output by the alternating current power supply, the direct current output positive connection end is configured to be a positive output connection end of the first direct current, and the direct current output negative grounding end is configured to be a negative output connection end of the first direct current; the anodes of the third diode D21 and the fifth diode D23 are connected with the direct current output negative grounding end, the anode of the third diode D21 is connected with the alternating current first connection end, the anode of the fifth diode D23 is connected with the alternating current second connection end, the cathodes of the fourth diode D22 and the sixth diode D24 are connected with the direct current output positive connection end, the anode of the fourth diode D22 is connected with the alternating current first connection end, and the cathode of the sixth diode D24 is connected with the alternating current second connection end.

[0018] The two ends of the second capacitor C20 are connected to the first AC connection terminal and the second AC connection terminal, respectively.

[0019] In one embodiment, the first rectifier module further includes a third capacitor C30 and a fourth capacitor C40; one end of the third capacitor C30 is connected to the second AC connection terminal, and the other end is grounded; one end of the fourth capacitor C40 is connected to the first AC connection terminal, and the other end is grounded.

[0020] In one embodiment, the first rectifier module further includes a varistor RV1 for overvoltage protection; the two ends of the varistor RV1 are respectively connected to the first AC connection terminal and the second AC connection terminal.

[0021] In one embodiment, the filtering module includes a fifth capacitor C50, a sixth capacitor C60, and a seventh capacitor C70; the two ends of the fifth capacitor C50, the sixth capacitor C60, and the seventh capacitor C70 are respectively connected to the positive DC output terminal and the negative DC output ground terminal.

[0022] According to the motor driver of the above embodiment, a separate input power supply for motor control is established instead of obtaining power from the DC bus. This eliminates the need to consider the reverse interference of the motor operation on the DC bus when designing the power supply circuit to power the controller, thereby reducing the design difficulty and production cost of the power supply circuit. Attached Figure Description

[0023] Figure 1 This is a block diagram of the power supply circuit of a motor driver in the prior art;

[0024] Figure 2 This is a structural block diagram of a motor driver in one embodiment;

[0025] Figure 3 This is a schematic diagram of the circuit connection of a half-bridge rectifier circuit in one embodiment;

[0026] Figure 4 This is a circuit connection diagram of the first rectifier module in one embodiment;

[0027] Figure 5 This is a schematic diagram of the circuit connection of the full-bridge rectifier circuit and the half-bridge rectifier circuit in one embodiment. Detailed Implementation

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0029] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the order of the steps or actions in the method description can be changed or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0030] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0031] Please refer to Figure 1This is a block diagram of the power supply circuit of a motor driver in the prior art, including a drive control module 10, an inverter module 20, a first rectifier module 30, a filter module 40, and a power input module 50. The drive control module 10 includes a controller 11, a drive circuit 12, and a power conversion circuit 13. The power input module 50 is connected to the first rectifier module 30 and is used to output AC power from an external AC power source to the first rectifier module 30. The first rectifier module 30 converts the AC power from the AC power source into first DC power. The filter module 40 is used to regulate and filter the first DC power, and the filtered first DC power is output to the inverter module 20 through a DC bus. The inverter module 20 is connected to the motor and is used to convert the first DC power into AC power that meets the requirements to drive the motor. The controller 11 in the drive control module 10 is connected to the drive circuit 12 and is used to send pulse control signals to the drive circuit 12. The drive circuit 12 is connected to the inverter module 20. The drive circuit 12 amplifies the pulse control signal and controls the switching of the switching transistors on the inverter bridge arm of the inverter module 20. The power conversion circuit 13 is connected to the controller 11. It obtains the first DC power from the DC bus and converts the first DC power into the second DC power as the working power of the controller 11. When the motor decelerates or stops suddenly, the motor will be in a generating state. The energy generated will be fed back to the DC bus, causing the voltage of the first DC power transmitted by the bus to continuously rise. The power conversion module 13 needs to convert the first DC power to obtain the second DC power. Therefore, when designing the circuit of the power conversion module 13, it is necessary to select electronic components with high voltage resistance (otherwise, the voltage rise phenomenon of the first DC power will damage the drive control module), which will inevitably increase the production cost of the power conversion module 13. Example

[0032] Please refer to Figure 2This is a structural block diagram of a motor driver in one embodiment. The motor driver includes a power input module 50, a first rectifier module 30, an inverter module 20, a second rectifier module 60, and a drive control module 10. The power input module 50 is connected to both the first rectifier module 30 and the second rectifier module 60, and is used to output AC power from an external AC power source to both the first rectifier module 30 and the second rectifier module 60. The input terminal of the first rectifier module 30 is connected to the power input module 50, and its output terminal is electrically connected to the inverter module 20. It is used to rectify the AC power from the external AC power source and output the rectified first DC power as the power supply for the inverter module 20. The input terminal of the second rectifier module 60 is connected to the power input module 50, and its output terminal is connected to the drive control module 10. It is used to rectify the AC power from the external AC power source and output the rectified second DC power as the power supply for the drive control module 10. The drive control module 10 is connected to the inverter module 20, and the drive control module 10 is used to send pulse control signals to the inverter module 20. The inverter module 20 is connected to the motor, and the inverter module 20 is used to control the switching of the switching transistors on its inverter bridge arm according to the pulse control signals, so as to invert the first DC power into AC power to drive the motor. In one embodiment, the motor driver further includes a filter module 40, which is connected between the first rectifier module 30 and the inverter module 20, and is used to perform voltage regulation and filtering on the first DC power.

[0033] In one embodiment, the drive control module 10 includes a power conversion circuit 13, a controller 11, and a drive circuit 12. The power conversion circuit 13 is connected to both the second rectifier module 60 and the controller 11. The power conversion circuit 13 converts a second DC power supply into a third DC power supply, which is then used as the operating power supply for the controller 11. The controller 11 is connected to the drive circuit 12 and sends pulse control signals to the drive circuit 12. The drive circuit 12 is connected to the inverter module 20 and amplifies the pulse control signals to control the switching of the switching transistors on the inverter bridge arm of the inverter module 20.

[0034] In one embodiment, the second rectifier module 60 includes a half-bridge rectifier circuit or a full-bridge rectifier circuit. Please refer to [reference needed]. Figure 3This is a schematic diagram of the circuit connection of a half-bridge rectifier circuit in one embodiment. In one embodiment, when the second rectifier module 60 includes a half-bridge rectifier circuit, the half-bridge rectifier circuit includes a first diode D11 and a second diode D12. The positive terminals of the first diode D11 and the second diode D12 are respectively used as the input terminals of the AC power output, and the negative terminals of the first diode D11 and the second diode D12 are electrically connected and serve as the output terminals of the second DC power. In one embodiment, the half-bridge rectifier circuit also includes a first capacitor C10. One end of the first capacitor C10 is connected to the negative terminal of the first diode D11, and the other end is grounded.

[0035] Please refer to Figure 4 The diagram shows the circuit connection of the first rectifier module in one embodiment. In one embodiment, the first rectifier module 30 includes a full-bridge rectifier circuit DB and a second capacitor C20.

[0036] Please refer to Figure 5 This is a schematic diagram of the circuit connections of a full-bridge rectifier circuit and a half-bridge rectifier circuit in one embodiment. The full-bridge rectifier circuit DB includes an AC first connection terminal, an AC second connection terminal, a DC output positive connection terminal, a DC output negative ground terminal, a third diode D21, a fourth diode D22, a fifth diode D23, and a sixth diode D24. The AC first connection terminal and the AC second connection terminal are used as input terminals for AC power output. The DC output positive connection terminal is used as the positive output connection terminal for the first DC power, and the DC output negative ground terminal is used as the negative output connection terminal for the first DC power. The anodes of the third diode D21 and the fifth diode D23 are connected to the DC output negative ground terminal. The anode of the third diode D21 is connected to the AC first connection terminal, and the anode of the fifth diode D23 is connected to the AC second connection terminal. The cathodes of the fourth diode D22 and the sixth diode D24 are connected to the DC output positive connection terminal. The anode of the fourth diode D22 is connected to the AC first connection terminal, and the cathode of the sixth diode D24 is connected to the AC second connection terminal. The two ends of the second capacitor C20 are connected to the first AC connection terminal and the second AC connection terminal, respectively.

[0037] like Figure 4As shown, in one embodiment, the first rectifier module 30 further includes a third capacitor C30 and a fourth capacitor C40. One end of the third capacitor C30 is connected to the second AC connection terminal, and the other end is grounded. One end of the fourth capacitor C40 is connected to the first AC connection terminal, and the other end is grounded. In one embodiment, the first rectifier module 30 further includes a varistor RV1 for overvoltage protection. The two ends of the varistor RV1 are connected to the first AC connection terminal and the second AC connection terminal, respectively. In one embodiment, the filter module 40 includes a fifth capacitor C50, a sixth capacitor C60, and a seventh capacitor C70. The two ends of the fifth capacitor C50, the sixth capacitor C60, and the seventh capacitor C70 are connected to the positive DC output connection terminal and the negative DC output ground terminal, respectively.

[0038] like Figure 3 As shown, the first diode D11, the second diode D12, and the first capacitor C10 serve as another conversion path for the AC power output to obtain the second DC power. The first DC power supplies power to the inverter module, which is used for the motor power stage. The second DC power supplies power to the drive control module, which is used for the motor control stage. Figure 5 As shown, in one embodiment, based on the characteristics of diodes, when a pump-up voltage appears on the DC bus used for power stage power supply during the operation of the motor, the reverse voltage of the rectifier bridge of the full-bridge rectifier circuit is 1000V, which can meet the design requirements.

[0039] In one embodiment, the first diode D11 and the second diode D12 in the half-bridge rectifier circuit of the second rectifier module can be replaced with multiple diode devices connected in parallel, and the specific number of parallel connections can be set according to the actual power requirements. In another embodiment, the third diode D21, the fourth diode D22, the fifth diode D23, and the sixth diode D24 in the full-bridge rectifier circuit of the first rectifier module can be replaced with six or eight diode devices, and the specific number of series and parallel connections can be set according to the actual power requirements.

[0040] The motor driver disclosed in this application includes a power input module, a first rectifier module, an inverter module, a second rectifier module, and a drive control module. The power input module outputs AC power from an external AC power source to the first and second rectifier modules respectively. The first rectifier module outputs a first DC power obtained by rectifying the AC power to the inverter module, and the second rectifier module outputs a second DC power obtained by rectifying the AC power to the drive control module. Because a separate power supply for motor control is established instead of drawing power from the DC bus, the design of the power supply circuit to the drive control module does not need to consider reverse interference to the DC bus caused by motor operation, thus reducing the design difficulty and production cost of the power supply circuit.

[0041] The above description uses specific examples to illustrate this utility model, which are only for the purpose of helping to understand this application and are not intended to limit this application. For those skilled in the art to which this application pertains, based on the concept of this application, several simple deductions, modifications, or substitutions can be made.

Claims

1. An electric motor drive, characterized by The power access module, the first rectifier module, the inverter module, the second rectifier module and the drive control module are connected with each other. The power access module is connected with the first rectifier module and the second rectifier module, and is used for outputting the alternating current output by the external alternating current power supply to the first rectifier module and the second rectifier module. The input end of the first rectifier module is connected with the power access module, and the output end of the first rectifier module is connected with the inverter module, which is used for rectifying the alternating current and outputting the first direct current obtained by rectification as the power supply of the inverter module. The input end of the second rectifier module is connected with the power access module, and the output end of the second rectifier module is connected with the drive control module, which is used for rectifying the alternating current and outputting the second direct current obtained by rectification as the power supply of the drive control module.

2. The motor driver of claim 1, wherein, The drive control module comprises a power conversion circuit, a controller and a drive circuit. The power conversion circuit is connected with the second rectifier module and the controller, and is used for converting the second direct current into third direct current and outputting the third direct current as the working power supply of the controller. The controller is connected with the drive circuit, and is used for sending a pulse control signal to the drive circuit. The drive circuit is connected with the inverter module, and is used for amplifying the pulse control signal and controlling the switch of the switch tube on the inverter bridge arm of the inverter module.

3. The motor driver of claim 1, wherein, The second rectifier module comprises a half-bridge rectifier circuit or a full-bridge rectifier circuit.

4. The motor driver of claim 3, wherein, When the second rectifier module comprises the half-bridge rectifier circuit, the half-bridge rectifier circuit comprises a first diode D11 and a second diode D12; the anodes of the first diode D11 and the second diode D12 are used as the input end of the alternating current output by the alternating current power supply, and the cathodes of the first diode D11 and the second diode D12 are connected with each other and used as the output end of the second direct current.

5. The motor driver of claim 4, wherein, The half-bridge rectifier circuit further comprises a first capacitor C10; one end of the first capacitor C10 is connected with the cathode of the first diode D11, and the other end is grounded.

6. The motor driver of claim 3, wherein, The first rectifier module comprises a full-bridge rectifier circuit and a second capacitor C20; The full-bridge rectifier circuit comprises an alternating current first connection end, an alternating current second connection end, a direct current output positive connection end, a direct current output negative ground end, a third diode D21, a fourth diode D22, a fifth diode D23 and a sixth diode D24; the alternating current first connection end and the alternating current second connection end are respectively used as input ends of alternating current output by the alternating current power supply, the direct current output positive connection end is used as a positive output connection end of the first direct current, and the direct current output negative ground end is used as a negative output connection end of the first direct current; the positive poles of the third diode D21 and the fifth diode D23 are connected with the direct current output negative ground end, the positive pole of the third diode D21 is connected with the alternating current first connection end, the positive pole of the fifth diode D23 is connected with the alternating current second connection end, the negative poles of the fourth diode D22 and the sixth diode D24 are connected with the direct current output positive connection end, the positive pole of the fourth diode D22 is connected with the alternating current first connection end, and the negative pole of the sixth diode D24 is connected with the alternating current second connection end. Two ends of the second capacitor C20 are respectively connected with the alternating current first connection end and the alternating current second connection end.

7. The motor driver of claim 6, wherein, The first rectifier module further comprises a third capacitor C30 and a fourth capacitor C40; one end of the third capacitor C30 is connected with the alternating current second connection end, and the other end is grounded; one end of the fourth capacitor C40 is connected with the alternating current first connection end, and the other end is grounded.

8. The motor driver of claim 6, wherein, The first rectifier module further comprises a pressure-sensitive resistor RV1 for overvoltage protection; two ends of the pressure-sensitive resistor RV1 are respectively connected with the alternating current first connection end and the alternating current second connection end.

9. The motor driver of claim 6, wherein, The filter module is further connected between the first rectifier module and the inverter module, and is used for voltage-stabilizing filtering of the first direct current.

10. The motor driver of claim 9, wherein, The filter module comprises a fifth capacitor C50, a sixth capacitor C60 and a seventh capacitor C70; two ends of the fifth capacitor C50, the sixth capacitor C60 and the seventh capacitor C70 are respectively connected with the direct current output positive connection end and the direct current output negative ground end.

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