CN213906295U - IGBT temperature protection structure of water heating PTC - Google Patents
IGBT temperature protection structure of water heating PTC Download PDFInfo
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- CN213906295U CN213906295U CN202022948146.2U CN202022948146U CN213906295U CN 213906295 U CN213906295 U CN 213906295U CN 202022948146 U CN202022948146 U CN 202022948146U CN 213906295 U CN213906295 U CN 213906295U
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Abstract
The utility model discloses a water heating PTC's IGBT temperature protection architecture is fixed with a plurality of IGBTs, every on the automatically controlled board the other thermistor that all is fixed with of IGBT, every thermistor all through circuit connection to MCU and with temperature signal transport to MUC. The utility model discloses a thermistor cost is lower to thermistor is close apart from the IGBT, and temperature acquisition is accurate, rapid, and real-time temperature can be gathered to every IGBT homoenergetic, can independent control, need not stop work together, has reduced the down time of temperature protection, has improved the utilization ratio.
Description
Technical Field
The utility model relates to a water heating PTC's IGBT temperature protection technical field.
Background
The water heating PTC generally has a plurality of IGBTs, and the IGBT can burn out fast when the temperature is too high, so all water heating PTC all have IGBT temperature protection. However, most of the designs in the market use the temperature sensor for temperature detection of the temperature protection of the IGBT, the IGBT temperature sensor is generally located outside the circuit board on the water heating PTC housing structure, and because the cost of one IGBT temperature sensor is more than 10 times of that of one thermistor, and the temperature sensor is large in volume and difficult to arrange, the cost and the structural arrangement problems are considered, the general water heating PTC is only provided with one IGBT temperature sensor, and the following problems are caused by the design:
1. the temperature collected by the IGBT temperature sensor is inaccurate: the temperature collected near which IGBT is closer to which IGBT is collected, and the temperature of the IGBT at the far distance cannot be collected;
2. the temperature is not collected by the IGBT temperature sensor in time: because the IGBT temperature sensor is positioned on the shell structure, the heat transfer path is long, the temperature change of the IGBT is rapid, and the temperature collected by the IGBT sensor is not reflected at all.
Therefore, in order to ensure that the IGBT does not burn out due to an excessively high temperature, the protection temperature of the IGBT has to be set too low when one IGBT temperature sensor is used, which results in an underutilization of the capability of the IGBT.
Disclosure of Invention
The utility model discloses technical scheme solves the not enough problem of IGBT ability utilization that water heating PTC adopted single IGBT temperature sensor to cause.
In order to realize the purpose, the utility model discloses a technical scheme be: a plurality of IGBTs are fixed on an electric control board, a thermistor is fixed beside each IGBT, and each thermistor is connected to an MCU through a circuit and transmits a temperature signal to an MUC.
Each thermistor is fixed on the electric control board, and each thermistor is fixed beside the collector of the IGBT monitored by the thermistor.
The MCU is fixed on the electric control board, the MUC is connected with each IGBT through mutually independent circuits, and the MUC outputs control signals to each IGBT through the circuits independently.
The utility model discloses a thermistor cost is lower to thermistor is close apart from the IGBT, and temperature acquisition is accurate, rapid, and real-time temperature can be gathered to every IGBT homoenergetic, can independent control, need not stop work together, has reduced the down time of temperature protection, has improved the utilization ratio.
Drawings
The following brief descriptions of the contents expressed by each figure and the marks in the figures in the specification of the present invention are as follows:
FIG. 1 is a schematic diagram of an IGBT temperature protection structure of a water heating PTC;
FIG. 2 is an exploded view of an IGBT temperature protection structure of a water heating PTC;
the labels in the above figures are: 1. an IGBT; 2. a thermistor; 3. MCU; 4. an electric control board.
Detailed Description
The following description of the embodiments with reference to the drawings is intended to illustrate the present invention in further detail, such as the shapes and structures of the components, the mutual positions and connections between the components, the functions and working principles of the components, the manufacturing process, and the operation and use methods, etc., so as to help those skilled in the art understand the present invention more completely, accurately and deeply.
As shown in fig. 1 and 2, the IGBT1 temperature protection structure of the water heating PTC is provided with a plurality of IGBTs 1, thermistors 2 with the number corresponding to that of the IGBTs 1, an MCU3, and an electronic control board 4.
The number of the IGBTs 1 is set according to the requirement, each IGBT1 is fixed on the electric control board 4, and the arrangement position of the IGBTs 1 on the electric control board 4 can be set according to the requirement.
The number of thermistors 2 is the same as the number of IGBTs 1, one thermistor 2 for each IGBT1 and for monitoring the temperature of the IGBT1, and each thermistor 2 is fixed near the collector of the IGBT1 monitored by the thermistor 2 to quickly sense the temperature of the IGBT1 at close distances.
MCU3 is fixed on automatically controlled board 4, every thermistor 2 is connected to MCU3 through the circuit, the temperature that will sense is handed over by MCU3 and is handled, if MCU3 senses which way IGBT1 temperature is too high, then stop this way IGBT 1's work immediately, MCU3 can carry out real-time judgement to the temperature of every IGBT1 like this, independent control, which reaches the temperature protection state, just stop the work of which IGBT1, in order to guarantee that the operating temperature of every IGBT1 is not overtemperature.
According to the control method of the IGBT1 temperature protection structure based on the water heating PTC, when the system works, the MCU3 acquires the parameters of the thermistors 2 in real time, and when the temperature value acquired by one or more thermistors 2 is higher than a set upper limit value, the power supply of the IGBT1 monitored by the thermistors 2 is disconnected. Each IGBT1 can be effectively controlled, the IGBT1 with overhigh temperature can be turned off in time, the turned-off IGBT1 can be continuously monitored, when the temperature is lower than the set lower limit value, the power supply of the IGBT1 monitored by the thermistor 2 is switched on, abnormal water level after turning off is avoided, in addition, the set upper limit value is larger than the set lower limit value, a transition interval with upper and lower limits exists, and the situation that the IGBT1 is repeatedly started and stopped to cause device damage is avoided.
The present invention has been described above with reference to the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments described above, and that the invention is not limited to the specific embodiments described above, but rather is intended to cover various insubstantial modifications of the inventive method and solution, or its application to other applications without modification.
Claims (3)
1. The utility model provides a water heating PTC's IGBT temperature protection structure is fixed with a plurality of IGBTs on the automatically controlled board, its characterized in that: and a thermistor is fixed beside each IGBT, and each thermistor is connected to the MCU through a circuit and transmits a temperature signal to the MUC.
2. The IGBT temperature protection structure of a water heating PTC according to claim 1, characterized in that: each thermistor is fixed on the electric control board, and each thermistor is fixed beside the collector of the IGBT monitored by the thermistor.
3. The IGBT temperature protection structure of a water heating PTC according to claim 1 or 2, characterized in that: the MCU is fixed on the electric control board, the MUC is connected with each IGBT through mutually independent circuits, and the MUC outputs control signals to each IGBT through the circuits independently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022948146.2U CN213906295U (en) | 2020-12-08 | 2020-12-08 | IGBT temperature protection structure of water heating PTC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022948146.2U CN213906295U (en) | 2020-12-08 | 2020-12-08 | IGBT temperature protection structure of water heating PTC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213906295U true CN213906295U (en) | 2021-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022948146.2U Active CN213906295U (en) | 2020-12-08 | 2020-12-08 | IGBT temperature protection structure of water heating PTC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213906295U (en) |
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2020
- 2020-12-08 CN CN202022948146.2U patent/CN213906295U/en active Active
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