CN105989768B

CN105989768B - YAG laser welding power supply teaching experiment and examination platform of passing a grade

Info

Publication number: CN105989768B
Application number: CN201510394613.2A
Authority: CN
Inventors: 樊永康; 苏镇耿; 其他发明人请求不公开姓名
Original assignee: Shenzhen Poda Laser Technology Co ltd
Current assignee: Shenzhen Poda Laser Technology Co ltd
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2020-05-19
Anticipated expiration: 2035-07-08
Also published as: CN105989768A

Abstract

The YAG laser welding entity power supply, the student experiment examination low-voltage low-current simulation circuit and the student experiment examination low-voltage low-current fault simulation module are all electrically connected with an upper computer through a CAN bus, and the student experiment examination low-voltage low-current fault simulation module comprises a detection circuit and a fault simulation circuit. The invention simulates the high-voltage high-current power supply circuit of the entity and the entity power supply to work synchronously by using a set of low-voltage low-current circuit under the safe voltage. The invention is applied to teaching, not only can enable students to see entities of YAG laser welding power supply, but also can automatically simulate various circuit faults to enable the students to search fault points to remove faults, and train the problem solving ability of the students.

Description

YAG laser welding power supply teaching experiment and examination platform of passing a grade

Technical Field

The invention belongs to the technical field of laser welding industrial application, and particularly relates to a YAG laser welding power supply teaching experiment and a graded examination platform.

Background

The YAG laser welding power supply is a set of high-voltage and high-current equipment, so that certain safety risk exists in teaching application, the existing teaching equipment of the YAG laser welding power supply is mainly characterized in that the YAG laser welding power supply for industrial application is tiled and installed and then placed in a closed transparent display box, students can only see the YAG laser welding power supply which cannot be used for operating circuits by hands or can manually connect circuits for carrying out experiments, and thus, the training of the manual operation capability of the students is limited.

Disclosure of Invention

The invention aims to provide a YAG laser welding power supply teaching experiment and a graded examination platform to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a YAG laser welding power teaching experiment and examination platform of passing a grade, includes host computer electric connection, student experiment examination low pressure undercurrent fault analog module, YAG laser welding entity power, student experiment examination low pressure undercurrent analog circuit, detection circuitry, fault analog circuit, YAG laser welding entity power, student experiment examination low pressure undercurrent analog circuit, student experiment examination low pressure undercurrent fault analog module all are connected with the host computer electric connection through the CAN bus, student experiment examination low pressure undercurrent fault analog module 22 includes detection circuitry and fault analog circuit.

Preferably, the general circuit of the YAG laser welding entity power supply includes 220V ac mains supply, a large-current air-core power inductor, a xenon lamp LP1, an IGBT module, a loop freewheeling diode, an IGBT drive protection circuit, a main control module, and a hall current transformer module, one end of the 220V ac mains supply is connected between a first unidirectional diode D1 and a second unidirectional diode D2, a first electrolytic capacitor C1 and a second electrolytic capacitor C2 are respectively connected to a first unidirectional diode D1 and a second unidirectional diode D2, the other end of the 220V ac mains supply is connected between a first electrolytic capacitor C1 and a second electrolytic capacitor C2, the hall current transformer module is respectively connected to the main control module and the large-current air-core power inductor, the IGBT drive protection circuit is respectively connected to the main control module and the IGBT module, the xenon lamp is connected between the IGBT module and the large-current air-core power inductor, and the loop freewheeling diode is connected to the two ends of the Hall current transformer module and the xenon lamp.

Preferably, the low-voltage and low-current analog circuit for student experiment examinations comprises a 9V alternating current power supply, a low-current power inductor, a high-power LED, a low-power IGBT, a loop freewheeling diode, a Hall current transformer, an IGBT driving protection circuit, an experiment circuit main control module and a double-contact relay, wherein the experiment circuit main control module is respectively connected with the IGBT driving module and the high-power LED, one end of the 9V alternating current power supply is connected between a third electrolytic capacitor and a fourth electrolytic capacitor, the other end of the 9V alternating current power supply is connected between a third unidirectional diode and a fourth unidirectional diode, the Hall current transformer is connected at two ends of the low-current power inductor and the third unidirectional diode, the loop freewheeling diode is connected at two ends of the high-power LED and the Hall current transformer, and the IGBT driving protection circuit is connected between the main control module and the low-power IGBT, a double-contact relay is added to each connecting line in the circuit, and the relay contacts are connected to two ends of the connecting line in series.

The invention has the technical effects and advantages that: the invention simulates the high-voltage high-current power supply circuit of the entity and the entity power supply to work synchronously by using a set of low-voltage low-current circuit under the safe voltage. The invention is applied to teaching, not only can the students see the entity of the YAG laser welding power supply, but also can build an electronic circuit like an entity power supply circuit for experiment under the condition of absolute safety, and can automatically detect whether the electronic circuit is connected correctly on line before the students are electrified, thereby avoiding the result that electronic components are burnt out due to improper connection; the invention can also automatically simulate various circuit faults to enable students to search fault points to remove the faults, and train the problem solving capability of the students; meanwhile, when the examination is taken, the questions can be automatically made from the question bank, and the examination scores of the students and the electronic circuit diagrams manually built can be automatically stored in a document mode, so that the basis for filing the examination scores of the students is reserved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

FIG. 2 is an overall circuit of a YAG laser welding physical power supply.

Fig. 3 is a circuit for student operation experiment.

Fig. 4 is a detection circuit.

Fig. 5 shows a connection of an electronic circuit error.

Fig. 6 shows a connection of an electronic circuit error.

Fig. 7 shows a connection of an electronic circuit error.

In the figure: the device comprises a 21 upper computer electrical connection, a 22 student experiment examination low-voltage low-current fault simulation module, a 23YAG laser welding entity power supply, a 24 student experiment examination low-voltage low-current simulation circuit, a 25 detection circuit and a 26 fault simulation circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a YAG laser welding power supply teaching experiment and grading test platform as shown in figure 1, which comprises an upper computer electrical connection 21, a student experiment test low-voltage low-current fault simulation module 22, a YAG laser welding entity power supply 23, a student experiment test low-voltage low-current simulation circuit 24, a detection circuit 25 and a fault simulation circuit 26, wherein the YAG laser welding entity power supply 23, the student experiment test low-voltage low-current simulation circuit 24 and the student experiment test low-voltage low-current fault simulation module 22 are electrically connected with the upper computer 21 through CAN buses, and the student experiment test low-voltage low-current fault simulation module 22 comprises the detection circuit 25 and the fault simulation circuit 26.

The general design block diagram of the invention is shown in fig. 1, the general circuit of a YAG laser welding entity power supply is shown in fig. 2, fig. 4 is 220V ac mains supply input, bus dc voltage Vbus generated after voltage doubling rectification through a first unidirectional diode D1, a second unidirectional diode D2, a first electrolytic capacitor C1 and a second electrolytic capacitor C2 is about 620V, L1 is a high-current air-core power inductor of 180uH, LP1 is a xenon lamp, Q1 is an IGBT module of 400A/1200V, D3 is a loop freewheeling diode, 1 is an IGBT drive protection circuit, 2 is a main control module, and 3 is a hall current transformer module with rated current of 400A. The circuit working control principle is as follows: setting a given reference current, measuring the current of a main loop by a Hall current transformer and feeding back the current to a main controller, and controlling an IGBT (insulated gate bipolar transistor) by the main controller through PWM (pulse-width modulation) so that the current flowing through a xenon lamp in the loop is stabilized at the set reference current.

The YAG laser welding solid power supply bus voltage Vbus reaches 620V, the main loop current CAN reach 400A at most, and the large voltage current is not suitable for being applied to student teaching experiments, so a set of low-voltage and small-current experimental circuit under safe voltage is added in the solution, the circuit principle of the experimental circuit is completely the same as that of a solid power supply, and the simulation experimental circuit module and the solid power supply circuit module communicate through a CAN bus to realize synchronous operation and control; simultaneously in order to be able to on-line automated inspection student build the electronic circuit of connection, the both ends of each connecting wire respectively concatenate a controllable switch in the circuit, this kind of controllable switch can use but not limited to MOSFET, relay etc. this solution has used a two contact relay, the relay contact respectively connects in series at the both ends of connecting wire, just so can keep apart this connecting wire with other connecting wires in the circuit when detecting the connecting wire, just can be independent this connecting wire of measurement correctly connect. The circuit for students to carry out manual experiment operation is shown in fig. 3, in the diagram, 5 is a 9V alternating current power supply, bus direct current voltage Vbus generated after voltage doubling rectification is about 25V, L2 is a low current power inductor of 180uH, LP2 is a high-power LED with rated current of 1A and forward voltage drop of 6V to replace a xenon lamp, Q2 is a low-power IGBT of 10A/600V, D4 is a loop freewheeling diode, 6 is a hall current transformer with rated current of 1A, 7 is an IGBT driving protection circuit, 8 is an experiment circuit main control module, and S is a relay normally closed contact. The working control principle is the same as the control principle of the entity power supply. In order to enable the experiment simulation circuit and the entity power supply circuit to operate synchronously, students feel that the experiment simulation circuit is controlled just like controlling the entity power supply, the experiment simulation circuit and the entity power supply circuit are connected together to communicate by a CAN bus, parameters on the entity power supply are set in an operation mode, a main controller on the entity power supply CAN transmit the same parameters to a main controller of the experiment simulation circuit through CAN communication, and each action of operating and executing the entity power supply CAN be notified to the experiment simulation circuit through the CAN bus, so that the overall synchronization is achieved.

In order to detect the electronic connection circuit of the experimental simulation circuit in real time on line, a detection circuit is required to be added, as shown in fig. 4, the intersection point between the connection line and the connection line is called an end point, the connection socket on the experimental platform is connected with the end point, each end point in the experimental circuit is provided with a plurality of connection terminal sockets when a plurality of connection lines are connected with the end point, or at most one connection terminal socket (such as a connection terminal socket to the ground and at most one connection terminal used as other detection terminal) is arranged at the end point, the detection unit of each connection line with the end point is detected, each end point is provided with 17 detection circuits, S in the figure is a normally closed relay contact, 10 and 11 are the connection socket of the end point of the experimental platform, 12 and 13 are the connection lines needing to be correct, 9 in 23 is the detection voltage of the output line controlled by the main control module of the experimental simulation, at the other end 21 of the line 14 is the output enable detect level signal controlled by the main control module of the circuit, U1 is a comparator, Vref is the comparator reference voltage-2.5V, and 15 is the comparator output signal. For convenience of explaining the principle of connecting line detection, the following terms are agreed: 1. at the detection end point: the terminal that is detecting whether the terminal has a connection line with other terminals is the detecting terminal, for example, in fig. 4, the terminal 10 is detecting whether the terminal 10 has a connection line with other terminals (e.g.,

terminals

11, 19, 22), and then the terminal 10 is the detecting terminal. 2. Scanning an end point: the scanning detection is that whether other end points of the non-detection end points are connected with the detection end points through connecting lines is called scanning end points. 3. End point detection voltage signal: the experiment simulation circuit main control module controls the voltage output to 9 in the detection terminal 23, the terminal detection voltage signal is valid when being 5V, and invalid when being 0V; at any time, only one of the endpoint detection voltage signals is active, or all of them are inactive. 4. End point scan enable signal: the experimental analog circuit main control module controls and outputs an enabling signal to a 14 detection level signal in a scanning endpoint 21, allows to detect whether the scanning endpoint is connected with a connection line at a detection endpoint, and is effective when the level signal is at a high level and ineffective when the level signal is at a low level; only one connecting line is used for detecting whether the enabling signal is valid or not at any time; during scan detection scan endpoint, the 9-endpoint detection voltage in the detection endpoint 23 remains active. The endpoint detection voltage and the endpoint scan enable signal for the same endpoint may not be active at the same time at any time.

The connection detection circuit works according to the following principle: when a student connects a circuit to be tested, a start button is pressed to operate the circuit, the master control module detects a start signal, the master control module does not allow the experimental circuit to operate at the moment, the master control module outputs a signal to operate all relays to disconnect all normally closed contacts, then detects the terminals one by one, for example, a 12 connection line between a terminal 10 and a terminal 11 in fig. 4 is correctly connected, the connection state of the terminal 10 is detected at the moment, the terminal 10 is a detected terminal, the master control controller outputs a terminal detection voltage signal to be effective on the terminal 10, simultaneously outputs a terminal scanning enabling signal to be effective on the terminal 11, if 12 has a correct connection line, a PNP triode Q3E-C is connected because 14 is high level, so that a terminal detection voltage signal 9 passes through D5, R1 (= 1K), the connection line 12, R2 (= 1K), the PNP triode Q3, R3 (= 100K), (R4 =30K, R5=30K, R6= 10K) is finally connected to ground, so that the voltage generated at 16 will be higher than the reference voltage Vref, and the output 15 of the comparator U1 will output a high level; the output of 15 is low if 12 is not connected by a bond wire. Therefore, when the main control module outputs the endpoint detection voltage signal to 9 to be valid and the endpoint scan enable signal to 14 to be valid, 12 has correct connection line connection when the high level is detected at 15, and no connection line connection is formed if the high level is low. Then the experimental simulation circuit main controller outputs an endpoint scanning enabling signal to scan and detect other remaining undetected endpoints in sequence, if 15 of the other endpoints has high level output, the endpoint is connected with the current detection endpoint through a connecting line, and if the other endpoints have low level, the endpoint is not connected.

Fig. 5, 6 and 7 are schematic diagrams of the erroneous connection of the electronic circuit.

If the circuit is only used as a student experiment, the experiment simulation circuit can complete the simulation of various line faults, because each connecting line in the circuit is connected with a relay, and the relays can be controlled independently. However, when a level test is performed, if the circuit connected with the student is incorrect, the circuit cannot work normally, so that the circuit cannot simulate faults to allow the student to perform a troubleshooting topic test. In order to solve the problem, a set of circuit is added to the device and is called as a fault simulation circuit as well as the experimental simulation circuit, and the end point of each connecting line in the fault simulation circuit is connected with the corresponding end point of the experimental simulation circuit, so that the fault simulation circuit is just like the shadow of the experimental simulation circuit. Under normal conditions, all relay contacts in the fault simulation circuit are disconnected, and the fault simulation circuit does not participate in work, so that the operation of the experiment simulation circuit is not influenced, and the fault simulation circuit only participates in work when a troubleshooting examination is carried out. When the fault simulation circuit works, all relays of the experiment simulation circuit are completely disconnected, so that the experiment simulation circuit does not influence the normal operation of the fault simulation circuit. The main control module in the fault simulation circuit controls a relay to break a contact to simulate that a related line has a fault, and when a student finds the correct position of a fault point, the student can correctly remove the fault.

In order to facilitate the management of teachers on the subjects of the students taking examinations, the examination archives of the students and the like, the upper computer is provided with special application management software for compiling a subject setting library and a student examination score archive database, the subject setting library is issued to the YAG laser welding entity power supply main control module through a CAN bus, and the examination scores of the students are also uploaded to the upper computer database through the CAN bus by the entity power supply main control module. The scheme realizes the on-line automatic detection of the student connection experiment circuit, so that the automatic filing of the manual connection circuit diagram required to be completed in the student examination becomes possible, the entity power supply main control module completely controls the experiment simulation circuit, all control instructions of the experiment simulation circuit are executed by the entity power supply main control module, the on-line automatic detection of the examination connection circuit is completed by the entity power supply main control module and the experiment circuit main control module in a cooperative manner, each connection line in the connection circuit is formed by each component into a unique code, the entity power supply uploads the codes to the upper computer, and the upper computer management software automatically converts the codes into a dxf file format of CAD to be stored.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a YAG laser welding power supply intelligent teaching experiment and examination platform of passing a grade, includes host computer (21), student experiment examination low-voltage undercurrent fault analog module (22), YAG laser welding entity power (23), student experiment examination low-voltage undercurrent analog circuit (24), detection circuitry (25), fault analog circuit (26), its characterized in that: the YAG laser welding entity power supply (23), the student experiment examination low-voltage low-current simulation circuit (24) and the student experiment examination low-voltage low-current fault simulation module (22) are electrically connected with an upper computer (21) through a CAN bus, the student experiment examination low-voltage low-current fault simulation module (22) comprises a detection circuit (25) and a fault simulation circuit 26, the overall circuit of the YAG laser welding entity power supply (23) comprises a 220V alternating current commercial power, a high-current hollow power inductor, a LP1 xenon lamp, an IGBT module, a first loop freewheeling diode, a first IGBT driving protection circuit, a first main control module and a Hall current transformer module, one end of the 220V alternating current commercial power is connected between a first one-way diode D1 and a second one-way diode D2, the other end of the 220V alternating current commercial power is connected between a first electrolytic capacitor C1 and a second electrolytic capacitor C2, the high-current hollow power inductor comprises a first electrolytic capacitor C1, a second electrolytic capacitor C2, a first one-way diode D1, a second one-way diode D2, a Hall current transformer module, a first main control module, a high-current hollow power inductor, a first IGBT driving protection circuit, a xenon lamp, a first loop freewheeling diode and a second loop freewheeling diode, wherein the first one-way diode D1 and the second one-way diode D2 are respectively connected; the low-voltage and low-current analog circuit (24) for the student experiment examination comprises a 9V alternating-current power supply, a low-current power inductor, a high-power LED, a low-power IGBT, a second loop freewheeling diode, a Hall current transformer, a second IGBT driving protection circuit, a second main control module and a double-contact relay; the second main control module is respectively connected with the second IGBT driving protection circuit, the Hall current transformer and the detection circuit; the IGBT power switch tube is connected with the high-power LED; one end of the 9V alternating current power supply is connected between the third electrolytic capacitor and the fourth electrolytic capacitor, and the other end of the 9V alternating current power supply is connected between the third one-way diode and the fourth one-way diode; the Hall current transformer is connected to the small current power inductor and the two ends of the third unidirectional diode; the second circuit freewheeling diode is connected to two ends of the high-power LED and the Hall current transformer, the second IGBT driving protection circuit is connected between the second main control module and the low-power IGBT switching tube, each connecting line in the low-voltage low-current simulation circuit (24) for the student experiment examination is additionally provided with a double-contact relay, and the relay contacts are connected to two ends of the connecting line in series.