CN210803603U - Factory power test circuit of general converter - Google Patents
Factory power test circuit of general converter Download PDFInfo
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- CN210803603U CN210803603U CN201821970500.8U CN201821970500U CN210803603U CN 210803603 U CN210803603 U CN 210803603U CN 201821970500 U CN201821970500 U CN 201821970500U CN 210803603 U CN210803603 U CN 210803603U
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- frequency converter
- transformer
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- power
- rectification
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Abstract
The utility model discloses a power test circuit that dispatches from factory of general converter inserts converter direct current power return circuit with a DC power supply, connects a step up transformer between the rectification input side and the contravariant output side of converter, and the converter contravariant output side is connected the step up transformer primary side promptly, and the rectifier input side is connected the step up transformer secondary side, makes converter and step up transformer constitute closed loop test circuit. During test, the output voltage of the inverter side of the frequency converter is boosted through the booster transformer, the secondary side voltage peak value of the booster transformer is higher than the direct-current bus voltage of the frequency converter, rectification is started, the voltage amplitude of the inverter side of the frequency converter is adjusted according to the experimental design power value, and control of the output power of the inverter side and the input power of the rectification side is achieved. The utility model discloses only need an external DC power supply and a step-up transformer can realize the full power test of dispatching from the factory of general converter, have simple structure, easily realize, characteristics such as low power dissipation.
Description
Technical Field
The utility model belongs to the converter field, especially a power test circuit dispatches from factory of general converter.
Background
The frequency conversion and speed regulation technology becomes an important means for saving energy, reducing consumption, improving process flow, improving product quality and environment and promoting technical progress in the industrial field, and meanwhile, the universal frequency converter is also a high-end intelligent basic core part for industrial application, and most of the universal frequency converters adopt a diode rectification topological structure.
The factory power test of the frequency converter is an indispensable part of the factory test of products, and the complete machine power test of the frequency converter is very difficult when the capacity is particularly large. At present, a reactor load is generally adopted for testing general frequency converter equipment, but full power testing cannot be realized on a rectification part, and a high-power frequency conversion system generally only tests a power unit to replace a complete machine test. Therefore, it is necessary to research an effective and energy-saving test method for a high-power frequency converter.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of current general converter power test of leaving a factory, provide a simple, low energy consumption's a general converter's power test circuit and test method of dispatching from the factory.
The utility model discloses a realize through following technical scheme:
a DC power supply is connected to a DC power loop of a frequency converter, and a step-up transformer is connected between a rectification input side and an inversion output side of the frequency converter, namely the inversion output side of the frequency converter is connected with a primary side of the step-up transformer, and the rectification input side is connected with a secondary side of the step-up transformer, so that the frequency converter and the step-up transformer form a closed loop test loop.
In the above technical scheme: the frequency converter is a three-phase universal frequency converter, and the booster transformer is a three-phase booster transformer; the frequency converter is formed by connecting a three-phase diode rectifying unit, a middle direct current side and a two-level inversion output unit; the inverter output side of the frequency converter is connected with the primary side of the boosting transformer, the rectifier input side of the frequency converter is connected with the secondary side of the boosting transformer, and the direct current power supply is connected to the middle direct current side of the frequency converter.
In the above technical scheme: the frequency converter is a single-phase universal frequency converter, and the booster transformer is a single-phase booster transformer.
In the above technical scheme: and the rectification side of the frequency converter adopts a diode passive rectification topology.
During test, the output voltage of the inverter side of the frequency converter is boosted through the booster transformer, the secondary side voltage peak value of the booster transformer is higher than the direct-current bus voltage of the frequency converter, rectification is started, the voltage amplitude of the inverter side of the frequency converter is adjusted according to the experimental design power value, and control of the output power of the inverter side and the input power of the rectification side is achieved.
The utility model discloses an advantage and beneficial effect do:
1. the utility model discloses a step up transformer links together general converter contravariant side and rectification side and constitutes closed loop, and whole test process does not have other active power consumption except the loss on converter self and circuit, only needs to follow the electric wire netting and takes less energy and can realize complete machine power test, accomplishes the test project.
2. The utility model discloses only need a miniwatt DC power supply and a step up transformer, consequently, the used auxiliary device of this test system is few, connect simple, easy realization.
3. The utility model discloses can realize the full power test of rectification part and contravariant part in step, overcome only the not enough of contravariant side full power test.
Drawings
FIG. 1 is a three-phase universal inverter test electrical wiring diagram of the present invention;
FIG. 2 is a schematic diagram of waveforms of output voltage and current of an inverter unit of the three-phase universal frequency converter;
FIG. 3 is a single-phase universal inverter test electrical wiring diagram of the present invention;
fig. 4 is a schematic diagram of waveforms of output voltage and current of an inverter unit of the single-phase universal frequency converter.
Detailed Description
In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.
Example one
A factory power test method of a universal frequency converter comprises the following steps of testing the field power of the universal frequency converter.
Step 1: according to the wiring method shown in figure 1, a direct current power supply is connected into a direct current power loop of a frequency converter, a step-up transformer is connected between a rectification input side and an inversion output side of the frequency converter, the frequency converter and the step-up transformer form a closed loop test loop, the voltage of the direct current power supply is the voltage of the direct current power loop under the rated working condition of equipment, the capacity is the sum of the self loss of the rated working condition of the frequency converter and the self loss of an external step-up transformer, and the direct current power supply provides energy required by the self loss of the equipment.
In this embodiment, the frequency converter is a three-phase universal frequency converter, and the step-up transformer is a three-phase step-up transformer; the frequency converter is formed by connecting a three-phase diode rectifying unit, a middle direct current side and a two-level inversion output unit; the inverter output side of the frequency converter is connected with the primary side of the boosting transformer, the rectifier input side of the frequency converter is connected with the secondary side of the boosting transformer, and the direct current power supply is connected to the middle direct current side of the frequency converter.
Step 2: the output power of the equipment is controlled by adjusting the V/F voltage-frequency ratio of the inverter output side of the frequency converter and adjusting the output current, and the outgoing power test and the temperature rise test of a power device of the rectification part and the inverter part of the frequency converter are completed.
Further, the factory power test is carried out on the rectification part and the inversion part of the frequency converter at the same time, and the test method comprises the following steps: the output voltage of the inverter side of the frequency converter is boosted through the booster transformer, the secondary side voltage peak value of the booster transformer is higher than the direct-current bus voltage of the frequency converter, rectification is started, the voltage amplitude of the inverter side of the frequency converter is adjusted according to the experimental design power value, and control of the output power of the inverter side and the input power of the rectification side is achieved.
For example, the inversion output frequency of the frequency converter is power frequency 50Hz, the amplitude of the inversion output voltage is adjusted, the inversion output voltage is boosted through a step-up transformer, the peak value of the secondary side voltage of the transformer is higher than the direct-current bus voltage of the frequency converter, rectification is started, the amplitude of the voltage on the inversion side is increased, the output current is gradually increased, the output current is increased to the test power of the frequency converter, and the test of the factory power of the frequency converter is carried out after stable operation. In the test process, no other power is consumed except the loss of the frequency converter and the loss of the booster transformer, so that the active power provided by the direct-current power supply is less than 10% of the capacity of the frequency converter.
The utility model discloses test method principle as follows: the inverter voltage output by the frequency converter is boosted through the boosting transformer, when the secondary side voltage peak value of the boosting transformer is higher than the direct-current loop voltage of the inverter, the secondary side voltage of the inverter is rectified through the rectifier bridge, energy flows out from the inverting side and flows in from the rectifying side of the transformer, and energy circulation is achieved; when the output voltage of the inverter side is increased, partial voltage is born by the leakage reactance of the step-up transformer, the secondary side voltage of the inverter is adjusted, an output circuit is increased, and the leakage reactance voltage drop of the step-up transformer is increased.
Example two
Referring to fig. 3, the difference between the present embodiment and the first embodiment is that the frequency converter may also be a single-phase frequency converter, and the step-up transformer is a single-phase step-up transformer. The inverting output side of the single-phase frequency converter is connected with the primary side of the unidirectional boosting transformer, the rectifying input side of the single-phase frequency converter is connected with the secondary side of the boosting transformer, and the direct-current power supply is connected with the middle direct-current side of the frequency converter, as shown in fig. 3.
The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.
Claims (4)
1. The utility model provides a power test circuit that dispatches from factory of general converter which characterized in that: a direct current power supply is connected to a direct current power loop of the frequency converter, and a booster transformer is connected between a rectification input side and an inversion output side of the frequency converter, namely the inversion output side of the frequency converter is connected with a primary side of the booster transformer, and the rectification input side of the frequency converter is connected with a secondary side of the booster transformer, so that the frequency converter and the booster transformer form a closed loop test loop.
2. The factory power test circuit of the universal frequency converter according to claim 1, wherein: the frequency converter is a three-phase universal frequency converter, and the booster transformer is a three-phase booster transformer; the frequency converter is formed by connecting a three-phase diode rectifying unit, a middle direct current side and a two-level inversion output unit; the inverter output side of the frequency converter is connected with the primary side of the boosting transformer, the rectifier input side of the frequency converter is connected with the secondary side of the boosting transformer, and the direct current power supply is connected to the middle direct current side of the frequency converter.
3. The factory power test circuit of the universal frequency converter according to claim 1, wherein: the frequency converter is a single-phase universal frequency converter, and the booster transformer is a single-phase booster transformer.
4. The factory power test circuit of the universal frequency converter according to claim 1, wherein: and the rectification input side of the frequency converter adopts a diode passive rectification topology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821970500.8U CN210803603U (en) | 2018-11-28 | 2018-11-28 | Factory power test circuit of general converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821970500.8U CN210803603U (en) | 2018-11-28 | 2018-11-28 | Factory power test circuit of general converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210803603U true CN210803603U (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821970500.8U Expired - Fee Related CN210803603U (en) | 2018-11-28 | 2018-11-28 | Factory power test circuit of general converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210803603U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283418A (en) * | 2018-11-28 | 2019-01-29 | 天津农学院 | A kind of factory power test test method of universal frequency converter |
-
2018
- 2018-11-28 CN CN201821970500.8U patent/CN210803603U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109283418A (en) * | 2018-11-28 | 2019-01-29 | 天津农学院 | A kind of factory power test test method of universal frequency converter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200619 Termination date: 20201128 |