CN210167802U - Over-temperature protection control system for transformer - Google Patents
Over-temperature protection control system for transformer Download PDFInfo
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- CN210167802U CN210167802U CN201920778177.2U CN201920778177U CN210167802U CN 210167802 U CN210167802 U CN 210167802U CN 201920778177 U CN201920778177 U CN 201920778177U CN 210167802 U CN210167802 U CN 210167802U
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- 238000005070 sampling Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Abstract
The utility model discloses a transformer over-temperature protection control system, which comprises an inversion module, a transformer, a non-critical load, a temperature adopting circuit, an SPWM driving module, an MCU and a voltage sampling circuit, wherein the voltage input end of the inversion module is connected with a battery, the voltage output end of the inversion module is connected with the transformer, the control end of the inversion module is connected with the SPWM driving module, the SPWM driving module is also connected with the MCU, the transformer is also respectively connected with a relay and the critical load, the relay is also connected with the non-critical load, the transformer is provided with a temperature sensor, the transformer over-temperature protection control system in the utility model can effectively realize the temperature control of the transformer in a power frequency inverter, prevent the damage of the transformer caused by the overhigh temperature of the transformer, ensure the more stable and reliable work of the whole power frequency inverter system, great practicability is brought to users.
Description
Technical Field
The utility model relates to a transformer technical field specifically is a transformer excess temperature protection control system.
Background
With the continuous improvement of living standard of people, the demand for electric power is more and more vigorous, especially in areas with very short and unstable electric power resources, and the power frequency inverter is a device capable of converting direct current of a battery into alternating current to provide electric power for various household appliances, so the demand of the power frequency inverter in the markets is more and more strong, and the electric power, environment and load conditions in the markets are more and more complex, so the heat loss of a transformer in the power frequency inverter is larger, the power frequency transformer has the maximum working temperature, the insulation of a transformer wire rod and the like are easily damaged when the maximum working temperature is exceeded, and the power frequency transformer is damaged under severe conditions, so that the power frequency inverter cannot work, and great inconvenience is caused to users.
The prevention measures for the over-temperature of the transformer in the existing power frequency inverter mainly comprise the following steps: the method comprises the steps of natural heat dissipation, or the temperature of a transformer is predicted based on the temperature of a radiating fin of a power frequency inverter to start forced air cooling heat dissipation, or a fan is controlled to start forced air cooling through the power, and the like, but the temperature of the transformer is not really controlled, and the maximum working temperature exists in the transformer, but the temperature of the transformer exceeds the maximum working temperature due to great heat loss of the transformer, so that the potential hazard of transformer damage caused by overhigh temperature of the transformer exists.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a transformer excess temperature protection control system, in order to solve the problem of proposing among the background art.
In order to realize the purpose, the utility model provides a following technical scheme:
the utility model provides a transformer excess temperature protection control system, adopts circuit, SPWM drive module, MCU and voltage sampling circuit including contravariant module, transformer, non-critical load, temperature, the battery is connected to the voltage input end of contravariant module, and the transformer is connected to the voltage output end of contravariant module, and SPWM drive module is connected to the control end of contravariant module, and SPWM drive module still connects MCU, and relay and critical load are still connected respectively to the transformer, non-critical load is still connected to the relay, be equipped with temperature sensor on the transformer, temperature sensor passes through temperature sampling circuit and connects MCU, and critical load still connects voltage sampling circuit, and MCU is still connected to voltage sampling circuit.
As a further aspect of the present invention: the inversion module is an IGBT inversion module.
As a further aspect of the present invention: the model of the MCU is TMS320F 28062.
As a further aspect of the present invention: the rated voltage of the battery is 48V.
As a further aspect of the present invention: the temperature sensor is a thermistor.
Compared with the prior art, the beneficial effects of the utility model are that: use the utility model provides a transformer excess temperature protection control system can effectual realization to the temperature control of transformer among the power frequency inverter, prevents to lead to the damage of transformer because of the transformer high temperature, makes the more reliable and stable work of whole power frequency inverter system, prolongs equipment service time, brings very big practicality for the user.
Drawings
FIG. 1 illustrates a schematic diagram of a transformer over-temperature protection control system;
FIG. 2 illustrates a derating curve of the over-temperature protection control system of the transformer;
fig. 3 illustrates a flow chart of the operation of the transformer over-temperature protection control system.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1: referring to fig. 1-3, a transformer over-temperature protection control system includes: the system comprises a battery, an inversion module connected with the battery, a transformer connected with the inversion module, a key load connected with the transformer, a relay connected with the transformer, a non-key load connected with the relay, an MCU, an SPWM drive connected with the MCU and the inversion module, a temperature sampling circuit connected with the MCU and the transformer, and a voltage sampling circuit connected with the MCU and the key load, wherein the inversion module further comprises an IGBT, and the transformer module further comprises a temperature sensor;
as shown in fig. 2 the embodiment of the present invention provides a derating curve diagram and fig. 3 the embodiment of the present invention provides a working process diagram of a transformer over-temperature protection control system, which is as follows:
when the MCU detects that the temperature T of the transformer is greater than the forced air cooling point T of the transformerfWhen the temperature of the transformer is lower than the over-temperature derating point T of the transformer, the MCU starts the fan to perform forced air cooling, and the temperature T of the transformer is further lower than the over-temperature derating point T of the transformerdDuring the process, the MCU drives and controls the inverter module to output a load voltage U by adjusting the SPWMNWhen the MCU detects that the temperature T of the transformer is greater than the over-temperature derating point T of the transformerdDuring the process, the MCU drives and controls the inverter module to output a load voltage U by adjusting the SPWMdAccording to the physical electrical formula P = U ^/2R, the load power can be changed into positive correlation exponential change when the load voltage is changed, and when the load voltage is U ^ 2RdLess than the load voltage UNWhen the load power is less than the load voltage UNAnd the corresponding load power is reduced, namely de-rating processing is realized. If the temperature T of the transformer is reduced after the de-rating treatment, the temperature T of the transformer is still increased to exceed the over-temperature load reduction point T of the transformerLDuring the process, the MCU controls the relay to disconnect the noncritical load, reduces the loss of the transformer by reducing the load amount so as to control the temperature of the transformer, and if the temperature T of the transformer still continues to riseUp to over-temperature protection point T of transformerpWhen the MCU is in the over-temperature protection state, the MCU is shut down;
example 2: based on the embodiment 1, the rated voltage of the battery is 48V, a 48V industrial frequency transformer is taken as an example, the maximum working temperature of the transformer is 180 ℃, so the forced air cooling point T of the transformer is setfSetting over-temperature de-rating point T of transformer at 100 DEG CdSetting an over-temperature load reduction point T of the transformer at 140 DEG C L160 ℃ and the over-temperature protection point T of the transformerpIt was 180 ℃.
The input of the power frequency inverter is connected with a 48V battery, then the machine is started, the MCU adopts F28062, the F28062 continuously samples the temperature of the transformer through the temperature sampling circuit, and when the temperature of the transformer is sampled to be larger than a forced air cooling point TfF28062 starts fan to wind at 100 degree; further, when the temperature of the transformer is sampled to be less than 150 ℃ of an over-temperature derating point, the F28062 drives and controls the inverter module to output 220V (rated voltage) of load voltage for load use through the SPWM, when the temperature of the transformer is sampled to continuously rise to exceed 150 ℃ of the over-temperature derating point, the F28062 drives and controls the inverter module to output 200V of load voltage for load use through the SPWM, the physical electrical formula P = U ^2/R can be known, the load power is 81% of the load power when the load voltage is 220V, and the power frequency inverter realizes derating output; because the minimum load voltage of the power frequency inverter is limited to 200V, when the load voltage continuously works at 200V, the power frequency inverter can still output 81% of rated power to the maximum, the temperature of the transformer can be increased continuously, and if the temperature of the transformer is increased to be larger than the over-temperature load reduction point TLIn the process, the F28062 controls the relay to disconnect non-critical loads, and reduces transformer loss by reducing load capacity, thereby realizing transformer temperature control; but if the transformer temperature continues to rise to when being greater than excess temperature protection point 180 ℃, then F28062 starts excess temperature protection, and power frequency inverter excess temperature protection is shut down, and is visible, based on the embodiment of the utility model discloses an excess temperature protection control of the inside transformer of power frequency inverter has been realized.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a transformer excess temperature protection control system, adopts circuit, SPWM drive module, MCU and voltage sampling circuit including contravariant module, transformer, non-critical load, temperature, the battery is connected to the voltage input end of contravariant module, and the transformer is connected to the voltage output end of contravariant module, and SPWM drive module is connected to the control end of contravariant module, and SPWM drive module still connects MCU, and relay and critical load are still connected respectively to the transformer, and non-critical load is still connected to the relay, its characterized in that, be equipped with temperature sensor on the transformer, temperature sensor passes through temperature sampling circuit and connects MCU, and critical load still connects voltage sampling circuit, and MCU is still connected to voltage sampling circuit.
2. The over-temperature protection control system of the transformer according to claim 1, wherein the inverter module is an IGBT inverter module.
3. The transformer over-temperature protection control system of claim 2, wherein the MCU is TMS320F 28062.
4. The transformer over-temperature protection control system according to claim 3, wherein the rated voltage of the battery is 48V.
5. The transformer excess temperature protection control system of any one of claims 1-4, wherein the temperature sensor is a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920778177.2U CN210167802U (en) | 2019-05-28 | 2019-05-28 | Over-temperature protection control system for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920778177.2U CN210167802U (en) | 2019-05-28 | 2019-05-28 | Over-temperature protection control system for transformer |
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| Publication Number | Publication Date |
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| CN210167802U true CN210167802U (en) | 2020-03-20 |
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| CN201920778177.2U Active CN210167802U (en) | 2019-05-28 | 2019-05-28 | Over-temperature protection control system for transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049410A (en) * | 2019-12-31 | 2020-04-21 | 华为数字技术（苏州）有限公司 | Control method of electric energy conversion device and electric energy conversion system |
| CN113357769A (en) * | 2021-05-26 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and control equipment for sharing air conditioner |
-
2019
- 2019-05-28 CN CN201920778177.2U patent/CN210167802U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049410A (en) * | 2019-12-31 | 2020-04-21 | 华为数字技术（苏州）有限公司 | Control method of electric energy conversion device and electric energy conversion system |
| CN113357769A (en) * | 2021-05-26 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and control equipment for sharing air conditioner |
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Address after: 510080 No. 2, 4, 6, 8, 10, and 12 Donghua Huaye Road, Renhe Town, Baiyun District, Guangzhou City, Guangdong Province (Airport Baiyun) Patentee after: GUANGZHOU FELICITY SOLAR TECHNOLOGY Co.,Ltd. Country or region after: China Address before: Room 101, Building 2, Gangpu Third Street, the Nanling Mountain, Taihe Town, Baiyun District, Guangzhou, Guangdong 510080 Patentee before: GUANGZHOU FELICITY SOLAR TECHNOLOGY Co.,Ltd. Country or region before: China |
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| CP03 | Change of name, title or address |