CN215416347U

CN215416347U - DSP processing system of motor integrated protector

Info

Publication number: CN215416347U
Application number: CN202122275170.9U
Authority: CN
Inventors: 郭雷雷
Original assignee: Ningbo Yisen Electromechanical Technology Co ltd
Current assignee: Ningbo Yisen Electromechanical Technology Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-01-04
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a DSP processing system of a motor comprehensive protector, which belongs to the field of motor control and solves the problems of high circuit complexity, complex data processing, low integration level and low calculation speed and low acquisition precision of a main control panel of the current intelligent switch cabinet system, and has the technical key points that: including power module, temperature measurement module, current-voltage acquisition module, RS485 communication module, ethernet communication module, signal conversion module and digital signal processing module, voltage stability and ripple are little, and data accuracy and reliability are high, designs 2 way RS485 conventional bus communications and 1 way ethernet bus communication, makes things convenient for bus network deployment convenience and high reliability greatly, and each detected object signal of system real time monitoring, and the security is high. The processor has an event recording function, does not lose data when power is down, and is convenient for analyzing fault reasons and diagnosing equipment defects.

Description

DSP processing system of motor integrated protector

Technical Field

The utility model relates to the field of motor control, in particular to a Digital Signal Processing (DSP) processing system of a motor comprehensive protector.

Background

With the continuous progress and the updating development of the modern technology level, various novel intelligent devices emerge endlessly, compared with most of the traditional mechanical devices, because most of the mechanical devices can not be separated from devices such as motors and the like, the electric power automation control is realized by integrating multiple functions such as protection, monitoring, control, communication and the like, and a high and new technology system is formed by the automation control, so that an ideal electrical appliance unit of the intelligent switch cabinet is formed. The comprehensive protection control system is widely popularized and used in system application with the voltage level below 35kv through high integration of multiple functions, flexible configuration and a friendly human-computer interface, a main control CPU board of the comprehensive protector is a core in the core, and accurate control is realized through a Micro Control Unit (MCU) software algorithm.

Moreover, most of the existing intelligent switch cabinets integrate multiple functions of protection, simple measurement, monitoring, control, human-computer interface, communication and the like; the switch cabinet is specially designed to be 'unitized', all automatic functions in the switch cabinet can be completed by one device, secondary design and construction of the switch cabinet are simplified, various conventional relays and measuring instruments are replaced, and a large amount of installation space and control cables are saved. The circuit complexity of a main control panel of the current intelligent switch cabinet system is high, a combination mode of a Micro Control Unit (MCU) and a Complex Programmable Logic Device (CPLD) processor is adopted conventionally, the data processing is complex, the integration level is not high, the calculation speed is low, and the acquisition precision is not high enough.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the embodiment of the utility model aims to provide a DSP processing system of a motor comprehensive protector, which adopts a high-performance 32-bit floating point Digital Signal Processor (DSP) and has the excellent characteristics of advanced kernel structure, high-speed operation capability, real-time signal processing and the like.

In order to achieve the purpose, the utility model provides the following technical scheme:

a DSP processing system of a motor comprehensive protector comprises a power supply module, a temperature measuring module, a current and voltage acquisition module, an RS485 communication module, an Ethernet communication module, a signal conversion module and a digital signal processing module; the power supply module, the temperature measuring module, the current and voltage acquisition module, the RS485 communication module, the Ethernet communication module and the signal conversion module are respectively connected with the digital signal processing module; the power module is composed of a topological structure of a DC/DC converter, and the temperature measuring module is composed of a temperature probe connected to a temperature acquisition circuit and used for generating a temperature signal according to the resistance change of the temperature probe; the current and voltage acquisition module consists of a voltage and current acquisition circuit and an acquired signal processing circuit topological structure and is used for inputting acquired voltage and sampled current into the metering chip for processing to obtain a voltage value and a current value; the RS485 communication module is communicated with the 2-channel RS485 bus communicated with the digital signal processing module and is used for carrying out bidirectional data transmission with the digital signal processing module; the Ethernet communication module and the digital signal processing module are in bidirectional data transmission and used for interaction between the digital signal processing module and an upper computer.

As a further scheme of the utility model, the DC/DC converter adopts a DC/DC chip with the model number of TPS767D301, and the converted power supply voltage has good stability and small ripple waves.

As a further scheme of the present invention, the temperature signal generated by the temperature probe is amplified by the amplifying circuit and transmitted to the digital signal processing module, and is processed by the AD converter integrated in the digital signal processing module to obtain a sampling voltage value, and the temperature value is calculated according to the sampling voltage value.

As a further scheme of the utility model, the temperature probe is a PTC or NTC temperature sensitive device, the temperature acquisition circuit is a PT100 temperature measurement circuit, and the amplification circuit is an LM358 amplification circuit.

As a further scheme of the utility model, the voltage and current acquisition circuit is used for phase current, zero sequence current and phase voltage acquisition, and is also used for differential current, multiplexing voltage and zero sequence voltage acquisition, the voltage and current acquisition circuit is connected with a three-phase mains supply, the three-phase mains supply is respectively connected to VA, VB and VC interfaces of the voltage and current acquisition circuit, a neutral line is connected to VO, the voltage is reduced by a voltage division circuit, and then filtered by an RC filter circuit, and then the sampled voltage is input to a metering chip for processing, so that a voltage value is obtained.

As a further scheme of the utility model, the metering chip adopts a special current and voltage acquisition chip with the model number of ATT 7022E.

As a further scheme of the utility model, the RS485 communication module is a chip with an isolation ADM2587E, and performs bidirectional data transmission with the digital signal processing module, and is used for sending data and alarm information acquired by the digital signal processing module to an upper computer control system or receiving a control instruction sent by an upper computer and forwarding the control instruction to the digital signal processing module.

As a further scheme of the present invention, bidirectional data transmission is performed between the ethernet communication module and the digital signal processing module, and the ethernet communication module is used for sending the acquired data and alarm information to an upper computer control system and receiving data of an upper computer and forwarding the data to the digital signal processing module.

As a further scheme of the present invention, a 12-bit AD converter is integrated inside the digital signal processing module, the highest main frequency is 150MHz, the digital signal processing module is configured to process the collected temperature signal and the current and voltage data, an alarm threshold is further set inside the digital signal processing module, and when the temperature value exceeds the set threshold, a protection action instruction is issued to the motor and the alarm information is reported to the upper computer system.

In summary, compared with the prior art, the embodiment of the utility model has the following beneficial effects:

the DSP processing system of the motor comprehensive protector has the excellent characteristics of an advanced kernel structure, high-speed computing capability, real-time signal processing and the like, is operated in an operating system mode, has better real-time performance, stable voltage, small ripple waves and extremely high data precision and reliability, is greatly convenient for bus networking convenience and high reliability, monitors signals of all detected objects in real time, and ensures the absolute safety of the protected objects by immediately performing corresponding logic processing on a processor once any abnormal signal appears. The processor has an event recording function, can record all events related to the safe operation of the power system, has the time resolution of less than 1ms, can record 90 events on line, does not lose data when power is down, and is convenient for analyzing fault reasons and diagnosing equipment defects.

To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a system block diagram of a DSP processing system of the integrated motor protector according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a DSP in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Fig. 3 is a circuit diagram of temperature measurement in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Fig. 4-7 are circuit diagrams of voltage and current acquisition in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Fig. 8-9 are circuit diagrams of collected signal processing in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Fig. 10 is a circuit diagram of an RS485 communication module in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Fig. 11 is a circuit diagram of an ethernet communication module in the DSP processing system of the integrated motor protector according to the embodiment of the present invention.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, an embodiment of the present invention provides a DSP processing system for a comprehensive motor protector, including a power module, a temperature measuring module, a current and voltage collecting module, an RS485 communication module, an ethernet communication module, a signal conversion module, and a digital signal processing module. The power module, the temperature measuring module, the current and voltage acquisition module, the RS485 communication module, the Ethernet communication module and the signal conversion module are respectively connected with the digital signal processing module.

In the embodiment of the present invention, referring to fig. 1 and fig. 2, the digital signal processing module (DSP) employs a high-performance 32-bit floating-point digital signal processor, which has excellent characteristics of an advanced kernel structure, high-speed computing capability, real-time signal processing, and the like, and replaces a conventional multi-processor joint processing mode, the speed is several times faster than that of the conventional one, and the integration level is very high, and the system operates in an operating system mode, and the real-time performance is better. The digital signal processing module is internally integrated with a 12-bit AD converter, the highest main frequency is 150MHz, and the DSP circuit of the digital signal processing module adopts a TMS320F28335 processor, as shown in FIG. 2. The digital signal processing module is used for processing the collected temperature signals and the current and voltage data, an alarm threshold value is further arranged in the digital signal processing module, and when the temperature value exceeds the set threshold value, a protection action instruction is sent to the motor and the alarm information is reported to the upper computer system.

The power supply module is composed of a DC/DC converter topological structure, the DC/DC converter is a DC/DC chip with the model number of TPS767D301, and the converted power supply voltage is good in stability and small in ripple wave. The temperature measurement module is composed of a temperature probe connected with a temperature acquisition circuit and used for generating a temperature signal according to the resistance value change of the temperature probe. Referring to fig. 1, the temperature acquisition circuit is a PT100 temperature measurement circuit, the temperature probe is connected to the PT100 temperature measurement circuit, the temperature probe employs a temperature sensitive device such as a PTC or NTC, the temperature signal generated by the temperature probe is amplified by the amplification circuit and transmitted to the digital signal processing module, the signal is processed by an AD converter integrated in the digital signal processing module to obtain a sampling voltage value, and the temperature value is calculated according to the sampling voltage value. When the temperature is sent and changed, the resistance value of the temperature probe is changed, the temperature signal is amplified through the amplifying circuit LM358, the signal is processed through the AD converter integrated in the digital signal processing module (DSP), the sampled voltage value is obtained, the corresponding temperature value is calculated according to the sampled voltage value, namely, the temperature collection is completed, and when the collected temperature value is larger than the set alarm threshold value, the system gives an alarm.

Referring to fig. 1, the current-voltage acquisition module is composed of a voltage-current acquisition circuit and an acquisition signal processing circuit topology structure, and is configured to input an acquired voltage and a sampled current to a metering chip for processing, so as to obtain a voltage value and a current value. In the present embodiment, referring to fig. 4 to 7, circuit diagrams a to n represent the circuit diagrams of the voltage and current acquisition circuit for phase current, zero sequence current and phase voltage acquisition and for differential current, multiplexed voltage and zero sequence voltage acquisition. The voltage and current acquisition circuit of the acquisition current and voltage acquisition module is respectively used for three-phase current detection (IA, IB and IC), three-phase voltage detection (UA, UB and UC), three-phase voltage detection (UAB, UBC and UCA), voltage frequency detection (F), active power detection (P), reactive power detection (Q) and power factor detection (COS).

Taking e in fig. 5 as an example, the three-phase mains supply is respectively connected to the phase voltages VA, VB, VC of the voltage current collecting circuit, and the neutral line is connected to the terminal voltage VO of the voltage current collecting circuit. Taking VA voltage acquisition as an example, after voltage VA is reduced by a voltage dividing circuit formed by connecting a resistor R72 in series with a resistor R730 and then connecting the resistor R75 in series with a resistor R76 in parallel, the voltage VA is filtered by an RC filter circuit formed by connecting a resistor R8 in series with a capacitor C25, and then sampled voltage is input into a metering chip, and the metering chip transmits an obtained voltage value to a digital signal processing module (DSP) for data processing through processing. Referring to fig. 8 and 9, the circuit diagram of the collected signal processing circuit is used for processing the voltage value and the current value collected by the voltage and current collecting circuit and then sending the processed voltage value and current value to the digital signal processing module for data processing.

Taking e in fig. 5 as an example, when the pins AT1V2P and AT1V 2N of the voltage-current acquisition circuit of the voltage VA are connected to the acquisition signal processing circuit in fig. 8, the pins AT1V2P and AT1V 2N of the acquisition signal processing circuit in fig. 8 are connected. In this embodiment, referring to fig. 4 to 7, circuit diagrams a to n show that the voltage and current acquisition circuits can be connected with the acquisition signal processing circuit shown in fig. 8 and 9 through pins thereof, so as to process the voltage value and the current value acquired by the voltage and current acquisition circuits and then send the processed voltage value and current value to the digital signal processing module for data processing.

The metering chip is a special current and voltage acquisition chip with the model number of ATT 7022E. The current and voltage acquisition module adopts a current and voltage acquisition special chip ATT7022E in the aspect of acquisition circuits, is simpler and more reliable than a conventional design mode of acquiring current and voltage by discrete components, and has extremely high data precision and reliability through a large amount of actual data tests.

Referring to fig. 1, the RS485 communication module is in 2-channel RS485 bus communication with the digital signal processing module, and is configured to perform bidirectional data transmission with the digital signal processing module. Referring to fig. 10, the RS485 communication module is a chip with isolation ADM2587E, and performs bidirectional data transmission with the digital signal processing module, and the chip with isolation ADM2587E is connected to the SCIC RS485 pin of the TMS320F28335 processor, and is configured to transmit data acquired by the digital signal processing module and alarm information to an upper computer control system or receive a control instruction transmitted by an upper computer and forward the control instruction to the digital signal processing module. The RS485 communication module can perform bidirectional data transmission between the DSP and a chip with an isolation ADM 2587E. The digital signal processing module can send the data and the alarm information of gathering to upper computer control system, and digital signal processing module also can collect the control command that the host computer sent and come and control.

Referring to fig. 1, the ethernet communication module and the digital signal processing module perform bidirectional data transmission therebetween, so as to interact between the digital signal processing module and an upper computer. Referring to fig. 11, the ethernet communication module adopts an ethernet interface with a model of USR-Kx, the ethernet communication module of USR-Kx is connected with the TMS320F28335 processor through SCIRXDC and SCITXDC pins, and the digital signal processing module can send acquired data and alarm information to the upper computer control system. When the upper computer sends a command, the data are firstly sent to the network server and are sent after being packaged and processed by the network server. The communication module receives the data sent by the server and then forwards the data to the digital signal processing module, the digital signal processing module processes the data, and the Ethernet module ensures that the data, alarm information and the like acquired by a product interact with an upper computer in real time.

In summary, the DSP processing system of the integrated motor protector of the present invention samples the hardware circuit filtering and the software time window technology at the same time, and ensures that the signal accuracy rate is 100%. The system monitors signals of each detected object in real time, and once any abnormal signal appears, the processor immediately performs corresponding logic processing to ensure the absolute safety of the protected object. The processor has an event recording function, can record all events related to the safe operation of the power system, has the time resolution of less than 1ms, can record 90 events on line, does not lose data when power is down, and is convenient for analyzing fault reasons and diagnosing equipment defects.

The technical principle of the present invention has been described above with reference to specific embodiments, which are merely preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. Other embodiments of the utility model will occur to those skilled in the art without the exercise of inventive faculty, and such will fall within the scope of the utility model.

Claims

1. A DSP processing system of a motor comprehensive protector is characterized by comprising a power supply module, a temperature measuring module, a current and voltage acquisition module, an RS485 communication module, an Ethernet communication module, a signal conversion module and a digital signal processing module; the power supply module, the temperature measuring module, the current and voltage acquisition module, the RS485 communication module, the Ethernet communication module and the signal conversion module are respectively connected with the digital signal processing module;

the temperature measuring module is formed by connecting a temperature probe into a temperature acquisition circuit and is used for generating a temperature signal according to the resistance value change of the temperature probe; the current and voltage acquisition module consists of a voltage and current acquisition circuit and an acquired signal processing circuit topological structure and is used for inputting acquired voltage and sampled current into the metering chip for processing to obtain a voltage value and a current value; the RS485 communication module is communicated with the 2-channel RS485 bus communicated with the digital signal processing module and is used for carrying out bidirectional data transmission with the digital signal processing module; the Ethernet communication module and the digital signal processing module are in bidirectional data transmission and used for interaction between the digital signal processing module and an upper computer.

2. The DSP processing system of an integrated motor protector as recited in claim 1, wherein the power module comprises a DC/DC converter topology, the DC/DC converter using a DC/DC chip model TPS767D 301.

3. The DSP processing system of the motor integrated protector according to claim 1, wherein the temperature signal generated by the temperature probe is amplified by the amplifying circuit and transmitted to the digital signal processing module, and is processed by an AD converter integrated in the digital signal processing module to obtain a sampling voltage value, and the temperature value is calculated according to the sampling voltage value.

4. The DSP processing system of the motor composite protector according to claim 3, wherein the temperature probe is a PTC or NTC temperature sensitive device, the temperature acquisition circuit is a PT100 temperature measurement circuit, and the amplification circuit is an LM358 amplification circuit.

5. The DSP processing system of the motor integrated protector according to claim 1, wherein the voltage and current collection circuit is used for collecting phase current, zero sequence current and phase voltage, and is also used for collecting differential current, multiplexing voltage and zero sequence voltage, the voltage and current collection circuit is connected with a three-phase mains supply, the three-phase mains supply is respectively connected with VA, VB and VC interfaces of the voltage and current collection circuit, a neutral line is connected with VO, voltage is reduced through a voltage division circuit, and then is filtered through an RC filter circuit, and then the sampled voltage is input into a metering chip for processing, so that a voltage value is obtained.

6. The DSP processing system of the motor comprehensive protector as claimed in claim 5, wherein the metering chip is a current and voltage acquisition special chip with model number ATT 7022E.

7. The DSP system of the motor integrated protector according to claim 1, wherein the RS485 communication module is a chip with an isolation ADM2587E, and performs bidirectional data transmission with the digital signal processing module, so as to transmit data acquired by the digital signal processing module and alarm information to the upper computer control system or receive a control instruction transmitted by the upper computer and forward the control instruction to the digital signal processing module.

8. The DSP processing system of the motor integrated protector according to claim 7, wherein the Ethernet communication module and the digital signal processing module perform bidirectional data transmission therebetween, and are configured to send collected data and alarm information to an upper computer control system and receive data of an upper computer and forward the data to the digital signal processing module.

9. The DSP processing system of the motor comprehensive protector as claimed in claim 1 or 2, wherein the digital signal processing module is used for processing collected temperature signals and current and voltage data, a 12-bit AD converter is integrated in the digital signal processing module, and the maximum dominant frequency is 150 MHz.

10. The DSP system of the motor integrated protector according to claim 9, wherein an alarm threshold is further provided in the DSP module, and when the temperature value exceeds the set threshold, a protection action instruction is issued to the motor and the alarm information is reported to the upper computer system.