CN218584930U - Special circuit board detecting instrument for container crane - Google Patents
Special circuit board detecting instrument for container crane Download PDFInfo
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- CN218584930U CN218584930U CN202221931709.XU CN202221931709U CN218584930U CN 218584930 U CN218584930 U CN 218584930U CN 202221931709 U CN202221931709 U CN 202221931709U CN 218584930 U CN218584930 U CN 218584930U
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Abstract
The invention discloses a special circuit board detecting instrument for a container crane, which comprises: the analog signal generator is used for triggering the driver driving board to generate square wave signals; the signal connection channel module is used for converting the square wave signal into a signal to be detected and transmitting the signal to the main circuit module; and the main circuit module is used for processing the signal to be detected to obtain a detection result and sending the detection result to the display and human-computer interface module for display. The invention abandons the method that the traditional equipment manufacturers generally do not maintain the circuit board, does not change the circuit board after the circuit board fails, and can meet the use requirements after detection and maintenance. Therefore, the cost is greatly reduced, and the profit is improved.
Description
Technical Field
The invention relates to a circuit board detection instrument, in particular to a detection instrument for a container crane driver circuit board.
Background
Variable frequency drives are produced primarily to meet the demand for speed regulation control of ac motors. The main circuit of the inverter drive system is generally composed of three parts, a "rectifier" for converting a commercial power supply into dc power, a "smoothing circuit" for absorbing voltage ripples generated in a converter and an inverter, and an "inverter" for converting dc power into ac power, which is also referred to as a "driver". In addition, when the asynchronous motor needs to be braked, a "brake circuit" is sometimes added.
The inverter (driver) is the reverse of the rectifier, and converts dc power into ac power of a desired frequency, and turns on and off 6 switching devices at predetermined times to obtain a 3-phase ac output. The inverter (driver) is mainly divided into three parts, namely a main control board, a driving circuit board and an IGBT module.
Wherein, the function of driver master control board: the main control board is mainly responsible for comparing and calculating commands such as external speed, torque and the like with current and voltage signals of the detection circuit, determining output voltage and frequency of the inverter, generating control commands and sending the control commands to a drive control board of the driver.
With the increase of the service life of the wharf equipment, the maintenance cost of the equipment driving equipment is increased year by year, and in order to reduce the maintenance cost, an efficient and convenient driver circuit board testing system needs to be established. The following problems are still to be solved:
1. due to the lack of online working condition detection of the offline maintenance board card, after part of the board cards are tested on the computer, the driver still cannot work normally, and needs to be disassembled and maintained for the second time; if the power element control board card is used, under the condition that the test is not determined to be normal, the on-board test can cause secondary damage to the power element of the driver, less, tens of thousands of elements are lost, more, and the situation generally exists in the industry.
2. When a driver fails, the state of components used in part of the drivers cannot be detected, and the components can only be passively and completely replaced at present, otherwise, secondary driver failure can be caused, and economic loss is caused.
3. The method has no drawing and online detection conditions, is the main difficulty of the current device-level fault detection, and can not carry out maintenance comparison test. Integrated ICs and transistors and resistor-capacitor devices beyond the device library cannot be tested.
Disclosure of Invention
The invention provides special test equipment for a driving circuit board of a container crane driver of shore bridge field bridge equipment, namely a Fuji driver driving circuit board 10EP-4142-C1-Z7, and aims to avoid loss caused by misoperation, such as circuit board burning loss caused by wrong circuit board power supply selection. The special test system is simplified in design, facilitates the field maintenance personnel to master the test system skillfully, and facilitates the improvement of the field maintenance efficiency.
In order to achieve the above object, the present invention provides a container crane dedicated circuit board detection instrument, which is characterized by comprising:
the analog signal generator is used for triggering the driver driving plate to generate square wave signals;
the signal connection channel module is used for converting the square wave signal into a signal to be detected and transmitting the signal to the main circuit module; the signal connection channel module comprises a signal conversion channel circuit and a six-channel voltage measuring circuit;
the main circuit module is used for processing the signal to be detected to obtain a detection result, outputting the detection result in a serial port form, converting a serial port signal into a 485 signal through a serial port-to-485 conversion module, and transmitting the signal to an upper computer of the detection instrument through a 485-to-USB (universal serial bus);
the display and human-computer interface module graphically displays the signal detection result through the upper computer and is used for judging the detection result by comparing the input and output signals of a detection person;
the signal connection channel module comprises six paths of input square wave signals, in each path, a signal to be detected is divided by two divider resistors R12 and R23, the voltage value is reduced to half of the original value, and the signal to be detected is divided into 2 paths; one of the paths enters a comparison circuit LM339A, is subjected to voltage reduction processing, and outputs a TTL voltage signal through a triode Q1, and the TTL voltage signal is transmitted to the main circuit module; and the other path of the data is input into a six-channel voltage measuring circuit, AD7606 carries out 16-bit accurate sampling measurement, outputs 16-bit parallel data and transmits the data to the main circuit module.
In a preferred mode, the circuit board detecting instrument for a container crane of the present invention further comprises:
the signal detection unit power supply module is used for supplying power to the instrument so as to drive each electric element in the related detection device to work;
the detection unit program memory module is used for detecting the writing operation and the storage function of the instrument program;
the program programming protection module is used for protecting in the program programming process;
and the system clock module provides a clock period of 20ns for the system through the crystal oscillator X1M.
The analog signal generator is a PWM signal generator ZK-PP2K.
The invention abandons the method that the traditional equipment manufacturer generally does not maintain the circuit board, does not change the whole circuit board after the circuit board breaks down, and can meet the use requirement after detection and maintenance. Rough estimation, which is calculated by the value of each circuit board from thousands to tens of thousands, if the failed circuit board is repaired, the repair cost is generally 15% of the original value. Meanwhile, the million-yuan expense for replacing the circuit board is saved, so that the cost is greatly reduced, and the profit is improved.
Drawings
Fig. 1 is a schematic diagram of an original circuit diagram of the circuit board detecting instrument specially used for the container crane.
FIG. 2 is a circuit diagram of a signal conversion channel in the detecting instrument of the present invention.
FIG. 3 is a circuit diagram of a six-channel voltage measuring circuit in the detecting instrument of the present invention.
FIG. 4 is a circuit diagram of serial port to 485 interface in the detecting instrument of the present invention.
FIG. 5 is a circuit diagram of a power supply circuit of a signal detection unit in the detecting instrument of the present invention.
FIG. 6 is a circuit diagram of a program memory of the detecting unit in the detecting instrument of the present invention.
FIG. 7 is a circuit diagram of the program programming protection circuit of the detection apparatus of the present invention.
FIG. 8 is a circuit diagram of a system clock in the detecting instrument of the present invention.
FIG. 9 shows a first part of the main circuit of the detecting instrument of the present invention.
FIG. 10 shows a second portion of the main circuit of the detecting instrument according to the present invention.
Detailed Description
As shown in figure 1, the invention provides a set of detection platform aiming at a special circuit board in a container crane, namely a Fuji driver driving circuit board 10EP-4142-C1-Z7, and the detection platform specifically comprises:
the analog signal generator is used for triggering the driver driving board to generate square wave signals;
the signal connection channel module is used for converting the square wave signal into a signal to be detected and transmitting the signal to the main circuit module; the signal connection channel module comprises a signal conversion channel circuit and a six-channel voltage measuring circuit;
the main circuit module is used for processing the signal to be detected to obtain a detection result, outputting the detection result in a serial port form, converting the serial port signal into a 485 signal through a serial port-to-485 conversion module, and transmitting the signal to an upper computer of the detection instrument through a 485-to-USB;
and the display and human-computer interface module graphically displays the signal detection result through the upper computer and is used for judging the detection result by comparing the input signal with the output signal of a detection person.
The displayed graphical waveform should be square wave, the frequency and the duty ratio of the square wave should be consistent with the output of the PWM signal generator, and the maximum value V of the square wave max And V min The turn-on and turn-off voltages of the control IGBTs output by the tested circuit board are represented. The quality of the tested circuit board can be judged by looking at the values.
Specifically, the signal generator of the invention is a PWM signal generator ZK-PP2K produced by Qingdao Wuzhi company.
The technical parameters are as follows: working voltage: 3.3-30V, and has the function of reverse connection prevention protection;
frequency range: 1Hz-150Hz, and the precision is about 1 percent;
duty cycle range: 0-100%,1% stepping;
output signal amplitude: the amplitude is equal to the supply voltage.
For the convenience of testing, the input signal of the system driver driving board is a waveform relatively convenient to observe, the system defaults to 20Hz, and the duty ratio is a square wave model with 50%.
The driver drive board is applied with analog signals, and 6 paths of square wave signals are output through 6 paths of output ports after the drive board carries out signal processing. The square wave signal enters through the detection means (in 1-in 6). Taking in1 as an example, a signal enters the detection device, and first enters a signal conversion channel circuit (as shown in fig. 2), a signal in1 to be detected is divided by two voltage dividing resistors R12 and R23 (both 47K Ω), and the voltage value of in1 is reduced to half of the original voltage value V1 (-4 VDC to 7.5 DVC). V1 is divided into 2 paths, wherein one path V1 is processed by the comparator circuit LM339A, and is subjected to voltage reduction processing, and outputs a TTL voltage signal PWM1 through the transistor Q1 (S9014), and the signal is transmitted to the signal detection apparatus main circuit (as shown in fig. 9 and 10), i.e., pin No. EP4CE22E22C8N-68, to provide duty ratio and frequency information of the signal for the detection apparatus. The other path of V1 is input into a six-channel voltage measuring circuit (shown in figure 3), pins U9-49 of the circuit diagram, AD7606, carry out 16-bit accurate sampling measurement on V1, and output 16-bit parallel data (DB 0-DB 15). The 16-bit parallel data output by the signal conversion channel circuit is transmitted to the main circuit of the signal detection device (as shown in fig. 9 and 10), and the main circuit performs data processing. After the related data of the signal to be detected is transported and processed by the EP4CE22E22C8N of the main circuit, the related data is transmitted to a serial port to 485 interface circuit (shown in figure 4) through pins of the EP4CE22E22C8N-50 and 51 in a serial port mode, a serial port signal is converted into a 485 signal, the signal is transmitted to an upper computer of the detection device through a 485 to USB, and a signal detection result is displayed on a display through application software arranged in the upper computer. The detection personnel judge whether the detection result is correct or not by comparing the input signal with the output signal.
In addition, as shown in fig. 5, the power supply module of the signal detection unit provides different power sources for the circuit board detection device to drive each electrical component in the related detection device to operate. As shown in fig. 6, the detection unit program memory module, M25P16-VMN3PB, is mainly responsible for the writing operation and storage function of the driver board detection device program. The program programming protection module shown in fig. 7 plays a role in protecting mainly during the program programming process. As shown in fig. 8, the system clock module provides a clock period of 20ns for the system through the crystal oscillator X1 (50M).
In an optimal mode, after the driver circuit board signal detection system detects the output signals of the circuit board, the 485-to-USB conversion interface transmits detection data to the upper computer, and a human-computer interaction interface and a display interface of the test system are arranged on the upper computer to display detection results. The signal detection of the system is realized by the FPGA. The FPGA adopts a Logic Cell Array (LCA), and comprises a Configurable Logic module CLB (Configurable Logic Block), an Input/Output module IOB (Input Output Block) and an internal connecting line (Interconnect). The logic of the FPGA is implemented by loading programming data into the internal static memory cells, and the values stored in the memory cells determine the logic functions of the logic cells and the connection modes between modules or between modules and I/O, and finally determine the functions that the FPGA can implement. The system is a detection system which is built by taking Altera EP4CE22E22C9N as a core. The human-computer interface is compiled by adopting Java language, and the system structure is as follows: browser + middleware + database (Browser/Server three-tier architecture). If the output signals of the display driving board are all square wave models of-8V-15V, the frequency and the duty ratio of the square wave models are consistent with the setting of the signal generator, and the driver circuit board works normally.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. The utility model provides a container crane private circuit board detecting instrument which characterized in that includes:
the analog signal generator is used for triggering the driver driving board to generate square wave signals;
the signal connection channel module is used for converting the square wave signal into a signal to be detected and transmitting the signal to the main circuit module; the signal connection channel module comprises a signal conversion channel circuit and a six-channel voltage measuring circuit;
the main circuit module is used for processing the signal to be detected to obtain a detection result, outputting the detection result in a serial port form, converting the serial port signal into a 485 signal through a serial port-to-485 conversion module, and transmitting the signal to an upper computer of the detection instrument through a 485-to-USB;
the display and human-computer interface module graphically displays the signal detection result through the upper computer and is used for judging the detection result by comparing the input and output signals of a detection person;
the signal connection channel module comprises six paths of input square wave signals, in each path, a signal to be detected is divided by two divider resistors R12 and R23, the voltage value is reduced to half of the original value, and the signal to be detected is divided into 2 paths; one of the paths enters a comparison circuit LM339A, is subjected to voltage reduction processing, and outputs a TTL voltage signal through a triode Q1, and the TTL voltage signal is transmitted to the main circuit module; and the other path of the data is input into a six-channel voltage measuring circuit, AD7606 carries out 16-bit accurate sampling measurement, outputs 16-bit parallel data and transmits the data to the main circuit module.
2. The container crane special circuit board detection instrument according to claim 1, further comprising: and the signal detection unit power supply module is used for supplying power to the instrument so as to drive each electric element in the related detection device to work.
3. The container crane special circuit board detection instrument according to claim 1, further comprising: and the detection unit program memory module is used for detecting the writing operation and the storage function of the instrument program.
4. The container crane special circuit board detection instrument according to claim 1, further comprising: and the program programming protection module is used for protecting the program programming process.
5. The container crane special circuit board detection instrument according to claim 1, further comprising: and the system clock module provides a clock period of 20ns for the system through the crystal oscillator X1M.
6. The container crane special circuit board detection instrument according to claim 1, wherein the analog signal generator is selected from a PWM signal generator ZK-PP2K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221931709.XU CN218584930U (en) | 2022-07-26 | 2022-07-26 | Special circuit board detecting instrument for container crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221931709.XU CN218584930U (en) | 2022-07-26 | 2022-07-26 | Special circuit board detecting instrument for container crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218584930U true CN218584930U (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221931709.XU Active CN218584930U (en) | 2022-07-26 | 2022-07-26 | Special circuit board detecting instrument for container crane |
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| CN (1) | CN218584930U (en) |
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2022
- 2022-07-26 CN CN202221931709.XU patent/CN218584930U/en active Active
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