CN112258924A - Three-level DC-DC converter examination device - Google Patents
Three-level DC-DC converter examination device Download PDFInfo
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- CN112258924A CN112258924A CN202011337216.9A CN202011337216A CN112258924A CN 112258924 A CN112258924 A CN 112258924A CN 202011337216 A CN202011337216 A CN 202011337216A CN 112258924 A CN112258924 A CN 112258924A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/183—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a three-level DC-DC converter checking device, which comprises a square box body, transparent panels are arranged on the periphery and the upper part of the square box body, the bottom of the box body is provided with a three-level DC-DC converter and an auxiliary circuit, the three-level DC-DC converter circuit comprises an input EMI (01), an input rectifier (02), an input filter (03), a TL ZVZCS PWM DC-DC converter (04), a UC3875 and SG3525 control circuit (05), a drive circuit (06) and a protection circuit (07), the auxiliary circuit comprises a relay, wires are connected among the three-level DC-DC converter circuit, the auxiliary circuit and the transparent panel according to an electric circuit, fault points K1-K6 are arranged in the three-level DC-DC converter, and the fault point is connected with a fault operation switch on the box body panel through a relay of the auxiliary circuit.
Description
Technical Field
The invention relates to a training assessment device for a full-bridge converter, in particular to a three-level DC-DC converter assessment device.
Background
Full-bridge converters are an important aspect of power electronics applications. In traditional vocational education, the relevant experimental training of full-bridge converter adopts the real device of instructing that the teaching instrument producer made. Aiming at the aspects of more important system debugging, waveform observation, actual fault analysis and the like in the full-bridge converter, almost all practical training devices are not involved, so that the learning obstacles of students in the aspect of the full-bridge converter are large. In addition, the multi-level converter is a novel high-voltage high-power converter, and various defects of a two-level circuit are overcome while high-quality output waveforms are obtained.
Therefore, the development of a three-level DC-DC converter examination device is urgently needed, and the comprehensive skill of the system debugging of students in the aspect of three-level DC-DC converters can be improved.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a three-level DC-DC converter assessment apparatus, which can cultivate the capability of students in system identification, system debugging, waveform observation, actual fault analysis, etc. for three-level DC-DC converters.
In order to achieve the purpose, the invention adopts the technical scheme that: a three-level DC-DC converter checking device comprises a tetragonal box body, wherein transparent panels are arranged on the periphery and the upper part of the tetragonal box body, the transparent panels comprise a starting switch, a fault operation switch, an input power circuit working state indicating lamp, a three-level conversion circuit working state indicating lamp, an inversion output testing hole, a transformer primary side testing hole and a transformer secondary side testing hole, a three-level DC-DC converter and an auxiliary circuit are arranged at the bottom of the box body, the three-level DC-DC converter circuit comprises an input EMI (01), an input rectifier (02), an input filter (03), a TL ZVZCS PWM DC-DC converter (04), a UC3875 and SG3525 control circuit (05), a driving circuit (06) and a protection circuit (07), the input EMI (01) comprises an input power fuse, the input rectifier (02) comprises a rectifier diode, the TL ZVZCS PWM DC-DC converter (04) comprises switching tubes Q1 and Q4, a rectifier transformer, a rectifier diode and an output high-frequency filter inductor, the UC3875 and SG 6 control circuit (05) comprises output pulses, the auxiliary circuit comprises a relay, conducting wires are connected among the three-level DC-DC converter circuit, the auxiliary circuit and the transparent panel according to electric lines, fault points K1-K6 are arranged in the three-level DC-DC converter, and the fault points are connected with a fault operation switch on a box body panel through the relay of the auxiliary circuit.
The fault points K1 to K6 set in the three-level DC-DC converter are a fault point at which the input power supply fuse of the analog 01 unit circuit is blown, a fault point at which one rectifier diode of the analog 02 unit circuit is broken, a fault point at which all rectifier diodes on the secondary side of the rectifier transformer of the analog 04 unit circuit are broken, a fault point at which the output high-frequency filter inductor of the analog 04 unit circuit is blown, a fault point at which the Q1 and the Q4 of the analog 04 unit circuit are broken, and a fault point at which the pulses provided to the switching tubes Q1 and Q4 by the analog 05 unit circuit are lost, respectively.
Adopt above-mentioned technical scheme's beneficial effect: a fault point is set in an actual three-level DC-DC converter, and the fault can be switched on or switched off according to requirements. When a fault point is closed, the image recognition capability of the three-level DC-DC converter of a student can be cultured, and the system analysis and design capability of the three-level DC-DC converter 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 a three-level DC-DC converter checking device provided with fault points K1-K6.
Detailed Description
The invention is described in detail below with reference to the following figures and examples:
a three-level DC-DC converter checking device comprises a tetragonal box body, wherein transparent panels are arranged on the periphery and the upper part of the tetragonal box body, the transparent panels comprise a starting switch, a fault operation switch, an input power circuit working state indicating lamp, a three-level conversion circuit working state indicating lamp, an inversion output testing hole, a transformer primary side testing hole and a transformer secondary side testing hole, a three-level DC-DC converter and an auxiliary circuit are arranged at the bottom of the box body, the three-level DC-DC converter circuit comprises an input EMI (01), an input rectifier (02), an input filter (03), a TL ZVZCS PWM DC-DC converter (04), a UC3875 and SG3525 control circuit (05), a driving circuit (06) and a protection circuit (07), the input EMI (01) comprises an input power fuse, the input rectifier (02) comprises a rectifier diode, the TL ZVZCS PWM DC-DC converter (04) comprises switching tubes Q1 and Q4, a rectifier transformer, a rectifier diode and an output high-frequency filter inductor, the UC3875 and SG 6 control circuit (05) comprises output pulses, the auxiliary circuit comprises a relay, conducting wires are connected among the three-level DC-DC converter circuit, the auxiliary circuit and the transparent panel according to electric lines, fault points K1-K6 are arranged in the three-level DC-DC converter, and the fault points are connected with a fault operation switch on a box body panel through the relay of the auxiliary circuit. And the teacher can flexibly set faults in the test training and check the faults conveniently.
The three-level DC-DC converter examination device is characterized in that 6 fault points arranged in the three-level DC-DC converter examination device are respectively as follows:
fault point K1 (located within 01 cell circuit): and simulating the input power supply fuse to blow. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit cannot be lightened, and the converter cannot be started.
Fault point K2 (located within 02-cell circuit): one rectifying diode of the analog input filter circuit is broken down. The fault phenomenon is as follows: the lamp for indicating the working state of the input power supply circuit cannot be lightened, and the converter cannot be started.
Fault point K3 (located within 04 cell circuit): in the analog three-level DC-DC converter circuit, all rectifier diodes on the secondary side of a rectifier transformer are broken down. The fault phenomenon is as follows: after the circuit is started, the 'input power supply circuit working state indicating' lamp is normally lightened, the 'three-level conversion circuit working state indicating' lamp cannot be lightened, and the 'inversion output' has no output value. The voltage of the primary side of the transformer is normal, and the voltage of the secondary side of the transformer is zero.
Fault point K4 (located within 04 cell circuit): in the analog three-level DC-DC converter circuit, the output high-frequency filter inductor is blown. The fault phenomenon is as follows: after the circuit is started, the circuit stops working quickly, the three-level conversion circuit working state indicating lamp cannot be lightened, and the inverter output has no output value.
Fault point K5 (located within 04 cell circuit): the Q1 and Q4 switch tubes in the analog three-level circuit are disconnected.
The fault phenomenon is as follows: after the circuit is started, the lamp is normally lightened by the 'three-level conversion circuit working state indication', the output value of the 'inversion output' is lower than a normal value, and the voltage of the 'primary side' test hole of the transformer is lower than the normal value; the voltage waveform was measured with an oscilloscope and only two levels of voltage appeared.
Failure point K6 (located within 05 cell circuit): the pulse provided by the analog SG3525 control circuit to the switching tubes Q1, Q4 disappears. The fault phenomenon is as follows: after the circuit is started, the lamp is normally lightened by the 'three-level conversion circuit working state indication', the output value of the 'inversion output' is lower than a normal value, and the voltage of the 'primary side' test hole of the transformer is lower than the normal value; the voltage waveform was measured with an oscilloscope and only two levels of voltage appeared.
Claims (7)
1. The invention discloses a three-level DC-DC converter checking device, which is provided with a tetragonal box body, wherein the periphery and the upper part of the tetragonal box body are transparent panels, the transparent panels comprise a starting switch, a fault operation switch, an input power circuit working state indicating lamp, a three-level conversion circuit working state indicating lamp, an inversion output testing hole, a transformer primary side testing hole and a transformer secondary side testing hole, the bottom of the box body is provided with a three-level DC-DC converter and an auxiliary circuit, the three-level DC-DC converter circuit comprises an input EMI (01), an input rectifier (02), an input filter (03), a TL ZVZCS PWM DC-DC converter (04), a UC3875 and SG3525 control circuit (05), a driving circuit (06) and a protection circuit (07), the input EMI (01) comprises a fuse, the input rectifier (02) comprises a rectifier diode, the TL ZVZCS PWM DC-DC converter (04) comprises switching tubes Q1 and Q4, a rectifier transformer, a rectifier diode and an output high-frequency filter inductor, the UC3875 and SG 6 control circuit (05) comprises output pulses, the auxiliary circuit comprises a relay, conducting wires are connected among the three-level DC-DC converter circuit, the auxiliary circuit and the transparent panel according to electric lines, fault points K1-K6 are arranged in the three-level DC-DC converter, and the fault points are connected with a fault operation switch on a box body panel through the relay of the auxiliary circuit.
2. The three-level DC-DC converter assessment device according to claim 1, wherein said fault point K1 is a fuse blow fault point in the analog input EMI (01).
3. The three-level DC-DC converter assessment device according to claim 1, wherein the fault point K2 is a fault point where a rectifying diode of the analog input rectifier (02) is broken down.
4. The examination device for the three-level DC-DC converter according to claim 1, wherein the fault point K3 is a fault point where all rectifier diodes on the secondary side of a rectifier transformer are broken down in an analog TL ZVZCS PWM DC-DC converter (04).
5. The examination device for the three-level DC-DC converter according to claim 1, wherein the fault point K4 is a fault point of an analog TL ZVZCS PWM DC-DC converter (04) with a blown output high-frequency filter inductor.
6. The examination device of claim 1, wherein the fault point K5 is a Q1, Q4 switch tube open circuit fault point in a TL ZVZCS PWM DC-DC converter (04).
7. The examination device of claim 1, wherein the fault point K6 is a pulse extinction fault point provided by the analog UC3875 and SG3525 control circuit (05) to the switching tube Q1, Q4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337216.9A CN112258924A (en) | 2020-11-25 | 2020-11-25 | Three-level DC-DC converter examination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337216.9A CN112258924A (en) | 2020-11-25 | 2020-11-25 | Three-level DC-DC converter examination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112258924A true CN112258924A (en) | 2021-01-22 |
Family
ID=74224981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011337216.9A Withdrawn CN112258924A (en) | 2020-11-25 | 2020-11-25 | Three-level DC-DC converter examination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112258924A (en) |
-
2020
- 2020-11-25 CN CN202011337216.9A patent/CN112258924A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210122 |
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| WW01 | Invention patent application withdrawn after publication |