Bus voltage detection system

Abstract

The application relates to the technical field of motor driving, and particularly discloses a bus voltage detection system which comprises an initialization module, a pre-charging module, a direct charging module, a motor driving module and an upper computer, the upper computer is signal-connected with a driver, the motor driving module is electrically connected with the driver, the voltage output end of a three-phase power supply is electrically connected with the input end of the initialization module, the output end of the initialization module is electrically connected with the weak-current input end of the driver, the voltage output end of the three-phase power supply is electrically connected with the input end of the direct charging module and the input end of the pre-charging module, and the output end of the direct charging module and the output end of the pre-charging module are both electrically connected with the strong-current input end of the driver. The application has the effect of accurately detecting bus voltage abnormalities.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor driving, and in particular to a bus voltage detection system. BACKGROUND

[0002] In the field of industrial automation, a driver is usually used for controlling the operation of equipment such as a three-phase motor, so as to realize accurate control and speed regulation of the three-phase motor. The bus voltage is mainly used for supporting the operation of the driver and providing power for the load end of the driver. The bus voltage of the driver needs to be provided with stable direct-current power by a three-phase power supply. The zero line is a common end lead-out line of the three-phase power supply, and provides a complete loop for current in the circuit.

[0003] During the operation of the three-phase motor, whether the three-phase motor can be successfully started is one of important factors for evaluating the indexes of the three-phase motor. During the starting process of the three-phase motor, a certain torque needs to be output to make the rotor rotate. During the process, if the bus voltage fails, the three-phase motor cannot be normally started, and even damaged. Therefore, a method for accurately detecting bus voltage abnormalities is needed, so as to take measures in time when the bus voltage is abnormal, and guarantee the normal operation of the three-phase motor. CONTENT OF THE INVENTION

[0004] In order to accurately detect bus voltage abnormalities, the application provides a bus voltage detection system.

[0005] The bus voltage detection system provided by the application adopts the following technical scheme:

[0006] A bus voltage detection system comprises an initialization module, a pre-charging module, a direct charging module, a motor driving module and an upper computer. The upper computer is signal-connected with a driver, and the motor driving module is electrically connected with the driver. The voltage output end of a three-phase power supply is electrically connected with the input end of the initialization module, and the output end of the initialization module is electrically connected with the weak current input end of the driver. The voltage output end of the three-phase power supply is electrically connected with the input end of the direct charging module and the input end of the pre-charging module. The output end of the direct charging module and the output end of the pre-charging module are both electrically connected with the strong current input end of the driver.

[0007] By adopting the technical scheme, in the initialization stage, the output end of the three-phase power supply supplies power to the driver, the host computer can see that the bus voltage of the driver displays abnormally, and other parameters display normally; in the pre-charging stage, the host computer can still monitor the bus voltage abnormality fault; when the direct charging module directly supplies power to the driver, the bus voltage in the driver reaches a normal level, the host computer detects that the bus fault in the driver disappears, and the motor driving module can be set to detect the output function of the driver; in the above manner, the detection of the bus voltage is realized, the modular design can ensure that the driver receives power from the three-phase power supply, and effective signal communication between the driver and the host computer is realized.

[0008] Preferably, the three-phase air switch K2 is further included, the pre-charging module includes a single-phase air switch K3, the three-phase air switch K2 and a second three-phase contactor, one end of the three-phase air switch K2 is electrically connected to the voltage output end of the three-phase power supply, the other end of the three-phase air switch K2 is electrically connected to the input end of the second three-phase contactor through the indicator light group respectively, and the output end of the second three-phase contactor is electrically connected to the strong current input end of the driver.

[0009] By adopting the technical scheme, when the initialization is completed, the two-phase air switch K1 is disconnected, the three-phase air switch K2 and the single-phase air switch K3 are closed, at this time, the output voltage of the three-phase power supply is input to the strong current input end of the driver through the indicator light group, and the pre-charging of the driver is realized in cooperation with the pre-charging circuit inside the driver, thereby avoiding the tripping problem caused by direct power supply; the indicator light group is a current limiting element for protecting the driver, and can indicate that the current driver is in the pre-charging state; the safety control of the three-phase power supply and the accurate management of the pre-charging process are realized.

[0010] Preferably, the direct charging module includes a first three-phase contactor and a single-phase air switch K4, one end of the three-phase air switch K2 is electrically connected to the voltage output end of the three-phase power supply, and the other end of the three-phase air switch K2 is electrically connected to the input end of the first three-phase contactor; the output end of the first three-phase contactor is electrically connected to the strong current input end of the driver; one end of the single-phase air switch K4 is electrically connected to one of the voltage output ends of the three-phase power supply, the other end of the single-phase air switch K4 is electrically connected to the control end A1 of the first three-phase contactor, and the output end of the zero line of the three-phase power supply is electrically connected to the control end A2 of the first three-phase contactor.

[0011] By adopting the technical scheme, after the pre-charging is completed, the single-phase air switch K3 is disconnected, the single-phase air switch K4 is closed, the strong current of the three-phase power supply directly supplies power to the driver through the first three-phase contactor, and at this time, the host computer detects that the bus fault in the driver disappears, thereby realizing the safe and direct power supply control of the strong current input of the driver.

[0012] Preferably, the initialization module comprises a voltage converter and a two-phase air switch K1, one voltage output end and a zero line output end of the three-phase power supply are electrically connected to one end of the two-phase air switch K1, the other end of the two-phase air switch K1 is electrically connected to the input end of the voltage converter, and the output end of the voltage converter is electrically connected to the weak current input end of the driver.

[0013] By adopting the technical scheme, in the initialization stage, the two-phase air switch K1 is closed, the output end of the three-phase power supply supplies power to the driver through the voltage converter, at this time, the bus voltage in the driver is low, the host computer checks that the bus voltage display of the driver is abnormal, and other parameters are normal; through the voltage converter and the two-phase air switch K1 in the initialization module, the three-phase power supply is converted into a voltage suitable for the weak current input of the driver, and the safety of power supply is ensured.

[0014] Preferably, the motor driving module comprises a three-phase motor and an encoder, the driver is provided with a voltage input end for driving the three-phase motor and an encoder control end for controlling the encoder; the voltage output end of the driver is electrically connected to the input end of the three-phase motor, and the encoder control end is electrically connected to the input end of the encoder.

[0015] By adopting the technical scheme, the driver can drive the three-phase motor to move and control the encoder to work, thereby controlling the rotation of the three-phase motor, and realizing the accurate driving of the three-phase motor by the driver and the effective control of the encoder signal.

[0016] Preferably, the driver is provided with a motor control end, the motor control end is electrically connected with a switch module, one end of the switch module is electrically connected to the output end of the voltage converter, the other end of the switch module is electrically connected to the motor control end of the driver, and the switch module is used for controlling the rotation of the three-phase motor.

[0017] By adopting the technical scheme, the rotation of the three-phase motor can be controlled through the switch module, and the detection of the output function of the driver can be more comprehensively realized.

[0018] Preferably, the switch module comprises a plurality of parallel switches, and the plurality of parallel switches are provided as a slow switch K5, a fast switch K6, a forward and reverse switch K7 and / or an enable switch K8.

[0019] By adopting the technical scheme, the on-off of the signals of the plurality of switches is controlled independently, the speed of the three-phase motor can be controlled by controlling the closing or opening of the slow switch K5 and the opening or closing of the fast switch K6, the forward and reverse rotation of the three-phase motor can be controlled by closing or opening the forward and reverse switch K7, the driver can enter the enabled state by closing the enable switch K8, the fault reset can be performed by closing the reset switch K9 when the driver reports a fault, if the fault cannot be cleared, it indicates that the driver may be damaged and needs to be further checked and repaired, and the flexible and diversified control of the motor driving system is realized by the switch module integrated with multiple functions.

[0020] Preferably, a braking resistor R is further included, two ends of the braking resistor R are electrically connected to a terminal U DC and a terminal R B of the driver.

[0021] By adopting the technical scheme, the braking resistor R is used to consume the voltage generated when the three-phase motor is stopped, so as to prevent the voltage from burning the driver.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. By integrating the initialization module, the pre-charging module, the direct charging module and the motor driving module, and cooperating with the upper computer, the comprehensive detection of the bus voltage and the safe and efficient control of the motor driving system are realized;

[0024] 2. The accurate control of the power supply of the three-phase power supply to the strong electric input end of the driver is realized by the first three-phase contactor and the single-phase air switch K4 in the direct charging module, and the safety and reliability of the power supply process are ensured;

[0025] 3. The pre-charging of the driver is realized by setting the pre-charging module and cooperating with the pre-charging circuit inside the driver, so as to avoid the tripping problem caused by direct power supply. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the circuit diagram of the present application.

[0027] Reference signs: 1, initialization module; 2, pre-charging module; 3, direct charging module; 4, motor driving module; 5, switch module. DETAILED DESCRIPTION

[0028] The present application will be further described in detail below with reference to the accompanying Figure 1 The present application will be further described in detail below with reference to the accompanying

[0029] The present application discloses a bus voltage detection system.

[0030] Refer toFigure 1 A bus voltage detection system comprises an initialization module 1, a pre-charge module 2, a direct charging module 3, a motor driving module 4 and an upper computer; the output end L3 of a three-phase power supply and the output end N of a zero line are electrically connected to the input end N and the input end L of the initialization module 1, and the output end of the initialization module 1 is electrically connected to the weak current input end of a driver; the voltage output end of the three-phase power supply is electrically connected to the input end of the direct charging module 3 and the input end of the pre-charge module 2, and the output end of the direct charging module 3 and the output end of the pre-charge module 2 are both electrically connected to the strong current input end of the driver; the motor driving module 4 is electrically connected to the driver; the upper computer is signal connected with the driver, and the parameters of the driver can be viewed through the upper computer.

[0031] The initialization module 1 comprises a voltage converter and a two-phase air switch K1, the output end L3 of the three-phase power supply is electrically connected to one end of the two-phase air switch K1, and the other end of the two-phase air switch K1 is electrically connected to the input end L of the voltage converter; the zero line output end N of the three-phase power supply is electrically connected to one end of the two-phase air switch K1, and the other end of the two-phase air switch K1 is electrically connected to the input end N of the voltage converter, and the positive output end and the negative output end of the voltage converter are respectively electrically connected to the weak current input end IN4 and the weak current input end IN5 of the driver. In the embodiment, the voltage converter is used to convert 220V voltage into 24V voltage.

[0032] In the initialization stage, the two-phase air switch K1 is closed, and the output voltage of the three-phase power supply is converted by the voltage converter to supply power to the driver. When the bus voltage is normally output, the upper computer views the bus fault at this time, and other parameters are displayed normally; because the driver does not obtain strong current at this time, the bus fault viewed through the upper computer belongs to the normal condition.

[0033] The pre-charge module 2 comprises a single-phase air switch K3 and a second three-phase contactor, and the embodiment further comprises a three-phase air switch K2, the voltage output end of the three-phase power supply is electrically connected to one end of the three-phase air switch K2, and the other end of the three-phase air switch K2 is electrically connected to the 1 pin, the 3 pin and the 5 pin of the second three-phase contactor through a group of indicator lights. In the embodiment, each group of indicator lights is two series-connected indicator lights, and the group of indicator lights is a current-limiting element for protecting the driver. The 2 pin, the 4 pin and the 6 pin of the second three-phase contactor are respectively electrically connected to the strong current input end IN1, the strong current input end IN2 and the strong current input end IN3 of the driver. The voltage output end L3 of the three-phase power supply is electrically connected to one end of the single-phase air switch K3, the other end of the single-phase air switch K3 is electrically connected to the control end A1 of the second three-phase contactor, and the zero line output end N of the three-phase power supply is electrically connected to the control end A2 of the second three-phase contactor. The 2 pin, the 4 pin and the 6 pin of the second three-phase contactor are respectively electrically connected to the strong current input end IN1, the strong current input end IN2 and the strong current input end IN3 of the driver.

[0034] When the initialization is completed, disconnect the two-phase air break K1, close the three-phase air break K2 and the single-phase air break K3, at this time, the output voltage of the three-phase power supply is input to the strong current input end of the driver through the indicator light group, and the pre-charging circuit inside the driver is used to realize the pre-charging of the driver, so as to avoid the tripping problem caused by direct power supply.

[0035] The direct charging module 3 includes a first three-phase contactor and a single-phase air break K4, the voltage output end L1, the voltage output end L2 and the voltage output end L3 of the three-phase power supply are electrically connected to one end of the three-phase air break K2, the other end of the three-phase air break K2 is electrically connected to the 1 pin, the 3 pin and the 5 pin of the first three-phase contactor respectively; the 2 pin, the 4 pin and the 6 pin of the first three-phase contactor are electrically connected to the input end IN1, the input end IN2 and the input end IN3 of the driver respectively; the voltage output end L1 of the three-phase power supply is electrically connected to one end of the single-phase air break K4, the other end of the single-phase air break K4 is electrically connected to the control end A1 of the first three-phase contactor, the zero line output end N of the three-phase power supply is electrically connected to the control end A2 of the first three-phase contactor, and the 2 pin, the 4 pin and the 6 pin of the first three-phase contactor are electrically connected to the strong current input end IN1, the strong current input end IN2 and the strong current input end IN3 of the driver respectively.

[0036] After the pre-charging is completed, disconnect the single-phase air break K3 and close the single-phase air break K4, the strong current of the three-phase power supply directly supplies power to the driver through the first three-phase contactor, and the host computer detects that the bus fault in the driver disappears.

[0037] The motor driving module 4 includes a three-phase motor, an encoder and a motor brake arranged in the three-phase motor. The driver is provided with output ends OUT1, OUT2 and OUT3 for driving the three-phase motor, and a motor encoder control end for driving the encoder. The two ends of the motor brake are electrically connected to the positive output end and the negative output end of the voltage converter. Preferably, the encoder is signal-connected with the host computer, so that the encoder can detect the rotating speed and direction of the three-phase motor and upload the detected results to the host computer. When the three-phase motor needs to slow down or stop, the motor brake can consume the energy generated by the reverse power generation of the three-phase motor in time, preventing damage to the three-phase motor.

[0038] On this basis, the driver is electrically connected with a braking resistor R, and the two ends of the braking resistor R are electrically connected to the terminal U DC and the terminal R B of the driver. The braking resistor R is used to consume the voltage generated when the three-phase motor stops rotating, preventing the voltage from burning out the driver.

[0039] The motor control end of the driver is also provided with a switch module 5 electrically connected to the positive and negative output ends of the voltage converter, and the other end of the switch module 5 is electrically connected to the motor control end of the driver, and the switch module 5 can control the rotation of the three-phase motor.

[0040] The switch module 5 includes a plurality of parallel switches, and in this embodiment, six switches are provided, which are respectively slow-speed switch K5, fast-speed switch K6, forward-reverse switch K7, enable switch K8, reset switch K9 and clear switch K10. By controlling the closing or opening of the slow-speed switch K5 and the opening or closing of the fast-speed switch K6, the rotation speed of the three-phase motor can be controlled. By closing or opening the forward-reverse switch K7, the forward-reverse rotation of the three-phase motor can be controlled. By closing the enable switch K8, the driver can be controlled to enter the enabled state. Moreover, when the driver reports a fault, the fault can be reset by closing the reset switch K9, and if the fault cannot be cleared, it means that the driver may be damaged and needs to be further checked and repaired.

[0041] The upper computer is arranged outside the three-phase motor and the driver, and the parameters of the driver and the state of the bus voltage can be viewed through the upper computer. When the three-phase motor rotates, the state of the bus voltage can be viewed in real time by the upper computer. In this embodiment, the upper computer is a computer, a smart phone or other electronic devices with data processing and communication capabilities.

[0042] The implementation principle of the embodiment of the application is that in the initialization stage, the two-phase air switch K1 is closed, the output end of the three-phase power supply supplies power to the driver through the voltage converter, and the bus voltage of the driver is displayed abnormally through the upper computer, and other parameters are displayed normally. In the pre-charging stage, the upper computer can still monitor the abnormal fault of the bus voltage. After the pre-charging is completed, the single-phase air switch K4 is closed and the single-phase air switch K3 is disconnected, and the strong current of the three-phase power supply directly supplies power to the driver through the first three-phase contactor. At this time, the bus voltage in the driver reaches the normal level, and the bus fault in the driver disappears in the upper computer. By detecting the rotation of the three-phase motor, the output function of the driver is detected.

[0043] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A bus voltage detection system, characterized in that, The system includes an initialization module (1), a pre-charging module (2), a direct charging module (3), a motor drive module (4), and a host computer. The host computer and the driver are connected by signals, and the motor drive module (4) and the driver are electrically connected. The voltage output terminal of the three-phase power supply is electrically connected to the input terminal of the initialization module (1), and the output terminal of the initialization module (1) is electrically connected to the low-voltage input terminal of the driver. The voltage output terminal of the three-phase power supply is electrically connected to the input terminal of the direct charging module (3) and the input terminal of the pre-charging module (2). The output terminals of the direct charging module (3) and the pre-charging module (2) are both electrically connected to the high-voltage input terminal of the driver.

2. The bus voltage detection system according to claim 1, characterized in that, It also includes a three-phase circuit breaker K2. The pre-charging module (2) includes a single-phase circuit breaker K3, a three-phase circuit breaker K2, and a second three-phase contactor. The voltage output terminal of the three-phase power supply is electrically connected to one end of the three-phase circuit breaker K2. The other end of the three-phase circuit breaker K2 is electrically connected to the input terminal of the second three-phase contactor through an indicator light group. The output terminal of the second three-phase contactor is electrically connected to the high-voltage input terminal of the driver. One of the voltage output terminals of the three-phase power supply is electrically connected to one end of the single-phase circuit breaker K3. The other end of the single-phase circuit breaker K3 is electrically connected to the control terminal A1 of the second three-phase contactor. The neutral output terminal of the three-phase power supply is electrically connected to the control terminal A2 of the second three-phase contactor.

3. The bus voltage detection system according to claim 2, characterized in that, The direct charging module (3) includes a first three-phase contactor and a single-phase circuit breaker K4. The voltage output terminal of the three-phase power supply is electrically connected to one end of the three-phase circuit breaker K2, and the other end of the three-phase circuit breaker K2 is electrically connected to the input terminal of the first three-phase contactor. The output terminal of the first three-phase contactor is electrically connected to the high-voltage input terminal of the driver. One of the voltage output terminals of the three-phase power supply is electrically connected to one end of the single-phase circuit breaker K4, and the other end of the single-phase circuit breaker K4 is electrically connected to the control terminal A1 of the first three-phase contactor. The output terminal of the neutral wire of the three-phase power supply is electrically connected to the control terminal A2 of the first three-phase contactor.

4. The bus voltage detection system according to claim 1, characterized in that, The initialization module (1) includes a voltage converter and a two-phase circuit breaker K1. One of the voltage output terminals and the neutral output terminal of the three-phase power supply are electrically connected to one end of the two-phase circuit breaker K1. The other end of the two-phase circuit breaker K1 is electrically connected to the input terminal of the voltage converter. The output terminal of the voltage converter is electrically connected to the low-voltage input terminal of the driver.

5. The bus voltage detection system according to claim 1, characterized in that, The motor drive module (4) includes a three-phase motor and an encoder. The driver is provided with a voltage input terminal for driving the three-phase motor and an encoder control terminal for controlling the encoder. The voltage output terminal of the driver is electrically connected to the input terminal of the three-phase motor, and the encoder control terminal is electrically connected to the input terminal of the encoder.

6. The bus voltage detection system according to claim 5, characterized in that, The driver is provided with a motor control terminal, which is electrically connected to a switch module (5). One end of the switch module (5) is electrically connected to the output terminal of the initialization module (1), and the other end of the switch module (5) is electrically connected to the motor control terminal of the driver. The switch module (5) is used to control the rotation of the three-phase motor.

7. A bus voltage detection system according to claim 6, characterized in that, The switch module (5) includes multiple switches connected in parallel, which are configured as a slow switch K5, a fast switch K6, a forward / reverse switch K7 and / or an enable switch K8.

8. The bus voltage detection system according to claim 1, characterized in that, It also includes a braking resistor R, the two ends of which are electrically connected to the terminals U of the driver. DC and terminal R B superior.

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