CN214377227U

CN214377227U - Training and examining device for SPWM variable-frequency speed regulation system

Info

Publication number: CN214377227U
Application number: CN202022715831.0U
Authority: CN
Inventors: 陈柬; 严金云; 何君
Original assignee: Nanjing Polytechnic Institute
Current assignee: Nanjing Polytechnic Institute
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-10-08
Anticipated expiration: 2030-11-23

Abstract

The utility model discloses a practical training checking device of an SPWM variable frequency speed control system, which is provided with a tetragonal box body, and comprises an SPWM variable frequency speed control circuit (1), an auxiliary circuit (2) and a transparent panel (3), and is characterized in that the SPWM variable frequency speed control circuit (1) is positioned at the bottom of the box body, the transparent panel (3) is positioned at the periphery and the upper part and comprises a power switch, a fault operation switch, an input power circuit working state indicating lamp, a single-phase bridge type inverter circuit state indicating lamp, an inverter output testing hole, a direct current voltage testing hole, a SPWM1 testing hole, an SPWM2 testing hole and a protection circuit testing hole, the auxiliary circuit (2) is positioned at the bottom and comprises a relay, the SPWM variable frequency speed control circuit (1) is connected with the auxiliary circuit (2) and a wire is connected between the transparent panel (3) according to an electric circuit, the SPWM variable-frequency speed regulation circuit (1) is internally provided with fault points K1-K5, and the fault points are connected with a fault operation switch on a box body panel through a relay of an auxiliary circuit.

Description

Training and examining device for SPWM variable-frequency speed regulation system

Technical Field

The utility model relates to a real standard examination device of variable frequency speed governing, specific theory relates to a real standard examination device of SPWM variable frequency speed governing system.

Background

SPWM variable frequency speed regulation is an important aspect of power electronic technology application. In traditional vocational education, experimental practical training related to SPWM variable frequency speed regulation adopts a practical training device manufactured by a teaching instrument manufacturer. Aiming at aspects such as more important system debugging, waveform observation and actual fault analysis in SPWM variable frequency speed regulation, almost all practical training devices are not involved, so that learning obstacles of students in SPWM variable frequency speed regulation are large.

Therefore, the development of an SPWM variable-frequency speed regulation system training and examining device is urgently needed, and the comprehensive debugging skill of students in the aspect of SPWM variable-frequency speed regulation systems can be improved.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims at providing a real standard examination device of SPWM variable frequency speed control system can cultivate the ability of student to aspects such as SPWM variable frequency speed control technique's system identification picture, system debugging, waveform observation and actual failure analysis.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a real standard examination device of SPWM variable frequency speed control system, has the tetragonal body box, including SPWM variable frequency speed control circuit (1), auxiliary circuit (2) and transparent panel (3), its characterized in that: SPWM variable frequency speed control circuit (1) is located the bottom half, contains input EMI (01), input rectification (02), input filter (03), single-phase bridge inverter circuit (04), ICL8038 and LM311 control circuit (05), M57962L drive circuit (06), CD4013 protection circuit (07), ICL8038 and LM311 control circuit (05) contain SPWM1 and SPWM2 waveform output, CD4013 protection circuit (07) contains the two D flip-flops of CD4013, has the Q output, transparent panel (3) are located all around and upper portion, contain switch, fault operation switch, "input power supply circuit operating condition instructs" lamp, "single-phase bridge inverter circuit state instructs" lamp, "contravariant output" test hole, "direct current voltage" test hole, "SPWM 1" test hole, "SPWM 2" protection circuit "test hole, auxiliary circuit (2) is located the bottom, including the relay, SPWM variable frequency speed governing circuit (1) with auxiliary circuit (2) be connected with the wire according to electric line between transparent panel (3), set up fault point K1 ~ K5 in SPWM variable frequency speed governing circuit (1), and link to each other fault operation switch on relay and the box panel that passes through auxiliary circuit with the fault point.

The fault points K1-K5 arranged in the SPWM variable-frequency speed control system are respectively a direct-current input open-circuit fault point in a simulation single-phase bridge inverter circuit (04), an output open-circuit fault point of the simulation single-phase bridge inverter circuit (04), a simulation ICL8038 and LM311 control circuit (05), an output open-circuit fault point of the SPWM1, a simulation ICL8038 and LM311 control circuit (05), an output open-circuit fault point of the SPWM2 and an output end Q of a CD4013 in a simulation CD4013 protection circuit (07) are low-level fault points.

Adopt above-mentioned technical scheme's beneficial effect: a fault point is set in an actual SPWM variable-frequency speed regulation system, and the fault can be switched on or switched off according to the requirement. When a fault point is closed, the graphic recognition capability of the SPWM variable-frequency speed regulation system of a student can be cultured, and the overall analysis and design capability of the SPWM variable-frequency speed regulation system is improved; when the circuit fault point is opened, the waveform observation, fault analysis and fault solving capabilities of students are cultured, so that the professional skills of the students in the aspect of power electronic technology are improved.

Drawings

FIG. 1 is a schematic diagram of the SPWM variable-frequency speed control system practical training assessment device provided with a fault point K1-K5.

Detailed Description

The following detailed description of the present invention is made with reference to the accompanying drawings and examples:

the utility model provides a real standard examination device of SPWM variable frequency speed control system, has the tetragonal body box, including SPWM variable frequency speed control circuit (1), auxiliary circuit (2) and transparent panel (3), its characterized in that: SPWM variable frequency speed control circuit (1) is located the bottom half, contains input EMI (01), input rectification (02), input filter (03), single-phase bridge inverter circuit (04), ICL8038 and LM311 control circuit (05), M57962L drive circuit (06), CD4013 protection circuit (07), ICL8038 and LM311 control circuit (05) contain SPWM1 and SPWM2 waveform output, CD4013 protection circuit (07) contains the two D flip-flops of CD4013, has the Q output, transparent panel (3) are located all around and upper portion, contain switch, fault operation switch, "input power supply circuit operating condition instructs" lamp, "single-phase bridge inverter circuit state instructs" lamp, "contravariant output" test hole, "direct current voltage" test hole, "SPWM 1" test hole, "SPWM 2" protection circuit "test hole, auxiliary circuit (2) is located the bottom, including the relay, SPWM variable frequency speed governing circuit (1) with auxiliary circuit (2) be connected with the wire according to electric line between transparent panel (3), set up fault point K1 ~ K5 in SPWM variable frequency speed governing circuit (1), and link to each other fault operation switch on relay and the box panel that passes through auxiliary circuit with the fault point. And the teacher can flexibly set faults in the test training and check the faults conveniently.

The training assessment device for the SPWM variable-frequency speed regulation system comprises 5 fault points which are respectively as follows:

fault point K1 (located within 04 cell circuit): and simulating the direct current input open circuit. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit is normally lightened, the lamp for indicating the state of the single-phase bridge type inverter circuit cannot be lightened, the voltage of a direct-current voltage test hole is 0V, and the voltage of an inverter output test hole is 0V.

Fault point K2 (located within 04 cell circuit): the output of the single-phase bridge type inverter circuit (04) is simulated to be broken. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit is normally lighted, the lamp for indicating the state of the single-phase bridge type inverter circuit is normally lighted, the voltage of a direct-current voltage test hole is larger than 0V (normal), and the voltage of an inverter output test hole is 0V.

Failure point K3 (located within 05 cell circuit): in the analog ICL8038 and LM311 control circuit (05), SPWM1 outputs the open circuit fault point. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit is normally lightened, the lamp for indicating the state of the single-phase bridge type inverter circuit cannot be normally lightened, the voltage of a direct-current voltage test hole is larger than 0V (normal), the voltage of an inverter output test hole is 0V, the test hole of the SPWM1 has no waveform, and the waveform of the test hole of the SPWM2 is normal.

Failure point K4 (located within 05 cell circuit): in the analog ICL8038 and LM311 control circuit (05), SPWM2 outputs the open circuit fault point. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit is normally lightened, the lamp for indicating the state of the single-phase bridge type inverter circuit cannot be normally lightened, the voltage of a direct-current voltage test hole is larger than 0V (normal), the voltage of an inverter output test hole is 0V, the waveform of the test hole of SPWM1 is normal, and the waveform of the test hole of SPWM2 is zero.

Fault point K5 (located within 07 unit circuit): the output end Q of the CD4013 in the analog CD4013 protection circuit (07) is in a low level. The fault phenomenon is as follows: after the circuit is started, the lamp for indicating the working state of the input power supply circuit is normally lightened, the lamp for indicating the state of the single-phase bridge type inverter circuit cannot be normally lightened, the voltage of a direct-current voltage test hole is larger than 0V (normal), the voltage of an inverter output test hole is 0V, the SPWM1 test hole has no waveform, the SPWM2 test hole has no waveform, and the test hole of the protection circuit is at a low level.

Claims

1. The utility model provides a real standard examination device of SPWM variable frequency speed control system, has the tetragonal body box, including SPWM variable frequency speed control circuit (1), auxiliary circuit (2) and transparent panel (3), its characterized in that: SPWM variable frequency speed control circuit (1) is located the bottom half, contains input EMI (01), input rectification (02), input filter (03), single-phase bridge inverter circuit (04), ICL8038 and LM311 control circuit (05), M57962L drive circuit (06), CD4013 protection circuit (07), ICL8038 and LM311 control circuit (05) contain SPWM1 and SPWM2 waveform output, CD4013 protection circuit (07) contains the two D flip-flops of CD4013, has the Q output, transparent panel (3) are located all around and upper portion, contain switch, fault operation switch, "input power supply circuit operating condition instructs" lamp, "single-phase bridge inverter circuit state instructs" lamp, "contravariant output" test hole, "direct current voltage" test hole, "SPWM 1" test hole, "SPWM 2" protection circuit "test hole, auxiliary circuit (2) is located the bottom, including the relay, SPWM variable frequency speed governing circuit (1) with auxiliary circuit (2) be connected with the wire according to electric line between transparent panel (3), set up fault point K1 ~ K5 in SPWM variable frequency speed governing circuit (1), and link to each other fault operation switch on relay and the box panel that passes through auxiliary circuit with the fault point.

2. The SPWM variable-frequency speed regulation system practical training assessment device as claimed in claim 1, wherein the fault point K1 is a DC input open circuit fault point in a simulated single-phase bridge inverter circuit (04).

3. The SPWM variable-frequency speed regulation system practical training assessment device as claimed in claim 1, wherein the fault point K2 is an output open circuit fault point of a simulation single-phase bridge inverter circuit (04).

4. The SPWM variable-frequency speed regulation system practical training assessment device as claimed in claim 1, wherein the fault point K3 is an open circuit fault point output by SPWM1 in a control circuit (05) of an analog ICL8038 and LM 311.

5. The SPWM variable-frequency speed regulation system practical training assessment device as claimed in claim 1, wherein the fault point K4 is an open circuit fault point output by SPWM2 in a control circuit (05) of an analog ICL8038 and LM 311.

6. The SPWM variable-frequency speed regulation system practical training assessment device as claimed in claim 1, wherein the fault point K5 is a low-level fault point at the output end Q of the CD4013 in the simulated CD4013 protection circuit (07).