CN202548205U

CN202548205U - Collecting and synchronizing device for welding current

Info

Publication number: CN202548205U
Application number: CN2011205717455U
Authority: CN
Inventors: 闫志鸿; 张潇; 陈志翔; 宋永伦
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2012-11-21
Anticipated expiration: 2021-12-30

Abstract

The utility model relates to a collecting and synchronizing device for a welding current and belongs to the technical field of welding. The device comprises a filter unit (1), a signal collecting unit (2) and a control unit (3), wherein the filter unit is composed of a filter circuit and a signal regulating circuit; the signal collecting unit is an A/D (Analog/Digital) converter and is used for realizing the collecting and converting of a current signal; the control unit comprises an ARM (Advanced RISC (reduced instruction-set computer) Machine), a serial port communication circuit, a JTAG (Joint Test Action Group) interface circuit and a PC (Personal Computer); the ARM is connected with an A/D conversion chip; a digital signal after being subjected to A/D conversion is read in the ARM; the ARM is connected with the PC through the serial port communication circuit, so as to realize the reading of a remotely set sampling frequency, a Baud rate, an output mode and a sampling signal; and a simulator is connected with software of an upper computer of the PC through a JTAG interface, thereby obtaining a rising edge, a falling edge and characteristic points, such as a basic value point, a peak point, a zero crossing point and the like, in the current signal. The collecting and synchronizing device for the welding current is suitable for the collecting, synchronous outputting and zero crossing triggering of the current signal during a welding process.

Description

A kind of welding current collection and synchronous device

Technical field:

The utility model relates to a kind of current acquisition and synchronous device, particularly a kind of current acquisition and synchronous device in being applied to weld.

Background technology:

In welding process; Welding current is one of the most key factor of influence welding form; Through the welding current in the welding process is analyzed, can study shop characteristic relevant in the welding process, like interim form, the size of splashing, arc stability etc. with welding current; Therefore, be very necessary to welding the real-time current collection and analyzing.

Tradition is gathered welding current has two kinds of methods: a kind of method is to utilize the welding current loop is linked to each other with the voltage hysteresis loop comparator; Only analyze the weld information that current over-zero was correlated with during the moment; The welding current quantity of information that this method obtains is few, thereby can not well analyze welding performance; Another kind method is to utilize the inner A/D module of single-chip microcomputer to gather welding current, but because the scope of Chip Microcomputer A sampling is 0～3.3V, and the scope of welding current is-1000A～1000A; After Hall current sensor sampling output, corresponding voltage signal size is-10V～10V, therefore; If using the AD module in the sheet samples; Just necessary additional designs circuit is controlled at voltage range in 0～3.3V, does like this and has not only brought unnecessary error; And the increase cost, the volume of increase device.

The utility model content:

The utility model technical matters to be solved is the technical matters that the current information amount is few, error is big, acquisition range is limited that exists in the existing welding current acquisition technique, and a kind of welding current collection and synchronous device are provided.

In order to solve the problems of the technologies described above; The utility model is realized through following technical scheme: a kind of welding current collection and synchronous device; This device is used for it is characterized in that among the sensed current loop: this device is made up of filter unit, signal gathering unit and control module; Wherein said filter unit is made up of filtering circuit and signal adjustment circuit, and input signal gets into signal adjustment circuit after by filtering circuit filtering; Said signal gathering unit is an A/D converter, realizes current signals and conversion; Said control module comprises ARM, serial communication circuit, jtag interface circuit and PC.The output port of filtering circuit is connected to signal adjustment circuit, and the output port of signal adjustment circuit is connected to the A/D converter in the signal gathering unit.ARM output terminal of clock pulse mouth is connected with the control end of A/D conversion chip the SPI module among the ARM is connected with A/D conversion chip respective signal IO port in the said control module, realizes communicating by letter between ARM and the A/D conversion chip.Serial communication circuit is connected ARM in the said control module with PC, realizes reading synchronously of long-range setting welding current signal SF, baud rate, the way of output, software reset and welding current signal.Said control module is provided with the jtag interface that is connected with external emulator, and emulator realized by the PC that simulation software is installed, and the signal of jtag interface import, exports, resetted, clock port links to each other the in-circuit emulation of realization current signal respectively with the ARM chip.

A/D converter in the said signal gathering unit is 12 signed position bipolarity A/D conversion chips, and model is AD7324.

The model that described ARM chip selects for use ST company to produce is the chip of STM32F103VCT6.

The communication chip that described serial communication circuit adopts is MAX3232.

The utility model through C language algorithm programming, obtains the unique point in the current signal in the host computer simulation software, like base value point, peak point, zero crossing, and the rising edge of current signal, negative edge etc., and can realize the zero cross fired function.In-circuit emulation during through program debug, is specified adjustment methods such as breakpoint, assigned address debugged program effectively in real time at for example single step, for debugging, revise and generate final program strong assurance is provided.

Compared with prior art; The beneficial effect of the utility model is: according to the welding current collection and the synchronous triggering device of this programme design, the filtering circuit input end is linked into after the Hall current sensor, need not designs electric resistance partial pressure and negative voltage become the circuit of positive voltage; Directly just can carry out the collection of welding current signal; After the current signal that collects converts digital signal to through A/D converter, be sent to and carry out algorithm controls in the control module, can realize the synchronous output of current signal; Particular point in the current signal; What for example the rising edge of unique point such as base value point, peak point, zero crossing and current signal, negative edge etc. can be real-time collects, and can access abundant current information, and can realize the function of zero cross fired through algorithm.Use through long-term can effectively solve the problem that the current information amount is few, error is big, acquisition range is limited in the traditional welding current acquisition circuit.

Description of drawings:

Fig. 1 is the structural representation block diagram of the utility model;

Fig. 2 is the theory diagram of the utility model;

Fig. 3 is the filtering circuit figure and the signal adjustment circuit figure of filter unit in the utility model;

Fig. 4 is the circuit diagram of the A/D converter of signal gathering unit in the utility model;

Fig. 5 is the power unit circuit diagram in the utility model;

Fig. 6 is the circuit diagram of the ARM part of control module in the utility model;

Fig. 7 is the serial communication circuit figure of control module in the utility model;

Fig. 8 is the jtag interface circuit diagram of control module in the utility model;

Among the figure, 1, filter unit, 2, signal gathering unit, 3, control module;

Embodiment:

For technological means, creation characteristic that the utility model is realized, reach purpose and be easy to understand understanding with effect, below in conjunction with concrete diagram, further set forth the embodiment of the utility model.

As shown in Figure 1, the utility model is made up of three parts: filter unit 1, signal gathering unit 2 and control module 3.The theory diagram of each unit is as shown in Figure 2, and filter unit comprises filtering circuit and signal adjustment circuit; Signal gathering unit is an A/D converter; Control module comprises ARM, serial communication circuit and jtag interface circuit.

As shown in Figure 3, filter unit is made up of filtering circuit and signal adjustment circuit.Because wherein filtering circuit is made up of inductance L 5, resistance R 51 and capacitor C 59, C60; Inductance L 5 can reduce the degree of pulsatility of output voltage; Resistance R 51 and capacitor C 59, C60 form π shape RC wave filter, can access filter effect better, make the pulsation of output voltage littler; Signal adjustment circuit is made up of voltage follower and some capacitance resistances, and its function is to improve the load-carrying ability of original circuit.

As shown in Figure 4; The AD7324 chip that A/D converter selects for use Analog Devices company to produce; AD7324 is a 12 signed position bipolarity A/D conversion chips, and this chip switching rate can reach 1MSPS, can accept the bipolarity analog input signal; Four analog channels are arranged, and each analog channel all can independently be programmed.Welding current signal is through after the filtering adjustment; Be input to the VIN0 input end of AD converter, AD converter AD7324 chip is gathered the aanalogvoltage of input end VIN0, and converts-4096～+ 4096 digital signal to; Arrive ARM to digital data transmission through the SPI data bus; ARM be through can obtaining correct welding current value after the computing, VDD and VSS port mouth connect respectively+15V and-15V voltage, the VCC port connects 3.3V voltage.

As shown in Figure 5, select for use power module AMS1117 and some electric capacity accomplish power supply by the 5V voltage stabilizing to 3.3V, be system's power supply; The some electric capacity that adopt are electrical power by-pass electric capacity; Be used for filtering interfering, resistance R 45 is to be used to limit transient current, and the LED1 lamp is lighted after correct energising; Select for use power module TMA to provide+15V and-15V power supply to the A/D conversion chip, the model of this power module is E0515S-2W, and C47 and C48 are used to filter the interference that power supply causes.

A ARM chip as shown in Figure 6, that ARM selects for use ST company to produce, model is STM32F103VCT6.The PB12 of ARM, PB13, PB14 and PB15 respectively with A/D converter in CS, SCLK, DOUT and DIN port be connected, A/D converter can be communicated by letter with ARM; C19, C29 and CY2 are that ARM provides RTC clock; C17, C18 and CY1 are that ARM provides system clock; As shown in Figure 8; Jtag circuit connects ARM chip and external emulator, and emulator is realized that by the PC that simulation software is installed the PA13 of ARM, PA14, PA15, PB3 and PB4 be the

7,9,5,13 and 3 of connection interface terminal JTAG respectively; In the host computer simulation software, programme through C language algorithm; Obtain the particular point in the current signal,, and can realize the zero cross fired function like rising edge, the negative edge of unique points such as base value point, peak point, zero crossing and current signal.In-circuit emulation when realizing program debug is through single step, specify adjustment methods such as breakpoint, assigned address debugged program effectively in real time, for debugging, revise and generate final program strong assurance is provided.

As shown in Figure 7, the serial communication circuit communication chip is MAX3232, and the digital signal of the PA9 pin output of ARM is sent to serial communication chip T1IN;, exports chip after handling by T1OUT; Chip has been accomplished level conversion, enters into the digital signal of controller through the DB9 joint, imports the R1IN of MAX3232 into; After chip is accomplished level conversion, import the PA10 of ARM into from R1OUT, this road serial communication is transferred in the PC current digital signal that collects to analyze; The PA2 that other one group of serial communication is ARM is connected with R2OUT with the T2IN of MAX3232 respectively with PA3, transmission course with above-mentioned one group identical, the purpose of this road serial communication is to regulate SF, baud rate, the way of output and software reset through serial ports.Through two groups of serial communication circuits, accomplish the communication between PC and the ARM.

Show more than and described the ultimate principle of the utility model and the advantage of principal character and the utility model that pass through long-term experiment, the welding current signal relative error that collects is less than 0.50%; Satisfy the requirement of system; The A/D converter switching rate can reach 1MSPS the soonest, and acquisition range can be-10V～+ 10V, the containing much information of collection; Particular point in the current signal; For example base value point, peak point, zero crossing, and rising edge of current signal, negative edge etc. can be real-time collects, and can access abundant current information.Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.

Claims

1. welding current collection and synchronous device, this device is used for it is characterized in that among the sensed current loop: this device is made up of filter unit (1), signal gathering unit (2) and control module (3); Wherein said filter unit (1) is made up of filtering circuit and signal adjustment circuit; The output port of filtering circuit is connected to signal adjustment circuit in the filter unit, and the output port of signal adjustment circuit is connected to the A/D converter in the signal gathering unit; Said signal gathering unit (2) is an A/D converter, realizes current signals; Said control module (3) comprises ARM, serial communication circuit, jtag interface circuit and PC; ARM output terminal of clock pulse mouth is connected with the control end of A/D conversion chip; SPI module among the ARM is connected with A/D conversion chip respective signal IO port, realizes communicating by letter between ARM and the A/D conversion chip; Serial communication circuit is connected ARM with PC, realize reading synchronously of long-range setting welding current signal SF, baud rate, the way of output, software reset and welding current signal; The signal of jtag interface is imported, exports, is resetted, clock port is connected with the ARM chip respectively, realizes the in-circuit emulation of current signal.

2. a kind of welding current collection as claimed in claim 1 and synchronous device is characterized in that: said signal gathering unit, A/D converter are 12 signed position bipolarity A/D conversion chips, and model is AD7324.

3. according to claim 1 or claim 2 a kind of welding current collection and synchronous device is characterized in that: in the said control module, and a ARM chip that ARM selects for use ST company to produce, model is STM32F103VCT6.

4. like claim 1 or 2 or 3 described a kind of welding current collection and synchronous devices, it is characterized in that: the serial communication circuit communication chip in the said control module is MAX3232.