Heat dissipation structure of encapsulated transformer and built-in temperature monitoring method thereof

Abstract

The invention relates to a heat dissipation structure of an encapsulated transformer and a built-in temperature monitoring method of the heat dissipation structure, the heat dissipation structure is optimized for an equipment circuit use scene in the underwater sound field, the heat dissipation structure comprises an outer shell, a ferrite transformer is arranged in the outer shell, and the inner shape feature of the outer shell is consistent with the outer contour structure of the contained ferrite transformer. A gap between the outer shell and the ferrite transformer is filled with heat-conducting pouring sealant for pouring, and meanwhile, four mounting brackets are arranged on the outer side of the outer shell; according to the temperature monitoring method, the overall temperature of the transformer is monitored remotely according to the added built-in temperature monitoring device, and automatic control or manual control is carried out when the overall temperature of the transformer exceeds a safety interval. According to the scheme, when the large-current power type transformer is designed, the heat dissipation structure is added to improve the power of the transformer, the size and weight of the transformer are reduced, and circuit safety control is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation manufacturing of power transformers, and in particular to a heat dissipation structure based on a potting-type transformer, and a built-in temperature monitoring method thereof. Background Art

[0002] In the circuits of underwater acoustic equipment (frequency from a few kilohertz to several hundred kilohertz), ferrite power transformers are used, generally for voltage conversion or impedance matching. Due to the space limitations of cabin cabinets, it is sometimes necessary to limit the volume and weight of high-power transformers in the circuit. Therefore, a solution is urgently needed to consider designing the transformer housing into a structure that is easy to dissipate heat at the beginning of the design, so as to ensure that a smaller space can be used to design a larger power.

[0003] At the same time, the cabin cabinet room where the equipment is installed is generally a certain distance away from the equipment controller. For safety control, a built-in temperature monitoring device needs to be added to facilitate remote monitoring of the overall temperature of the transformer and automatic or manual control when the overall temperature of the transformer exceeds the safety range. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a heat dissipation structure based on a potted transformer, which is optimized for the use scenario of the equipment circuit in the field of underwater acoustics, and includes an outer shell, in which a ferrite transformer is arranged, and the shape characteristics of the inner part of the outer shell are consistent with the outer contour structure of the ferrite transformer accommodated therein, except that the outer contour size is slightly larger, and a potted heat-conductive potting glue is arranged in the gap between the outer shell and the ferrite transformer, and four mounting brackets are processed on the outer side of the outer shell;

[0005] In the ferrite transformer, flat copper wires are used to wind the primary and secondary windings respectively, which are directly turned outward to the outer shell and then welded out, and the lead pins formed by the lead-out are isolated from the outer shell by an insulating material;

[0006] At the same time, a thermistor is also arranged on one side of the magnetic core of the ferrite transformer, and a metal lead at one end of the thermistor is connected to an external display control circuit through an external high temperature resistant AF line.

[0007] In one embodiment of the present invention, the outer shell as a whole is a component of a sink-type structure and is processed from a whole piece of aluminum plate.

[0008] In one embodiment of the present invention, the ferrite transformer includes a PM100 core structure, wherein the current during operation reaches more than 20A.

[0009] In one embodiment of the present invention, the thermistor is MF52A103F3950 (A1), R25 = 10kΩ, and the accuracy is ±1%; therefore, during the assembly and use of the thermistor, the black head portion at one end is inserted into the uncured thermal conductive potting glue and adhered to the lower surface of the core or shell of the ferrite transformer.

[0010] The present invention also provides a built-in temperature monitoring method based on a heat dissipation structure, comprising the following steps:

[0011] Step S1: The potted ferrite transformer and the outer shell are fastened to the metal bracket and the cold plate in the equipment cabinet in the hydroacoustic field with screws, and at the same time, the bottom is ensured to be in good contact with the cold plate of the cabinet;

[0012] Step S2: Connect the input and output ends of the ferrite transformer to the circuit printed board of the host computer, and connect the external high temperature resistant AF lead of the thermistor to the display control circuit of the host computer;

[0013] Step S3: After the ferrite transformer circuit is powered normally and starts to work for a period of time, the ferrite transformer starts to heat up under load, and the resistance value of the thermistor is measured and displayed in real time by the resistance meter. After manual conversion, manual control is performed according to the situation, or the conversion is controlled by a computer program according to the resistance-temperature conversion table, and a real-time temperature display is given.

[0014] In one embodiment of the present invention, in step S3, the relationship between manual and program control is: according to the subsequent temperature setting, when there is no over-temperature, a normal mark is displayed, and the computer program continues to control; when the safe temperature is exceeded, an alarm mark is displayed, and the engineer performs manual control according to the situation; and after a period of time, there is no intervention, the transformer temperature continues to rise, and exceeds the limit setting temperature set by the program, then the program will automatically control and cut off the power supply.

[0015] The above technical solution of the present invention has the following advantages over the prior art: the heat dissipation structure based on the encapsulated transformer and the built-in temperature monitoring method thereof described in the present invention are used for designing a large current power transformer. When designing the transformer, the heat dissipation structure is considered to increase the transformer power, reduce the transformer volume and weight, and a built-in thermistor is used for temperature monitoring, so as to facilitate subsequent monitoring of the transformer temperature and circuit safety control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the heat dissipation structure of the potted transformer after assembly of the present invention;

[0018] Figure 2 It is a system flow chart of the built-in temperature monitoring method based on the heat dissipation structure of the present invention.

[0019] As shown in the figure, 1. Shell, 2. Ferrite transformer, 3. Thermistor, 4. Thermal conductive potting glue. DETAILED DESCRIPTION

[0020] Embodiment 1

[0021] like Figure 1 As shown, this embodiment provides a heat dissipation structure based on a potted transformer, which is optimized for the use scenario of the equipment circuit in the field of underwater acoustics, and includes an outer shell 1, in which a ferrite transformer 2 is arranged, and the shape characteristics of the inner part of the outer shell 1 are consistent with the outer contour structure of the ferrite transformer 2 accommodated therein, except that the outer contour size is slightly larger, and a potted heat-conductive potting glue 4 is arranged in the gap between the outer shell 1 and the ferrite transformer 2, and four mounting brackets are processed on the outer side of the outer shell 1;

[0022] The ferrite transformer 2 uses flat copper wires to wind the primary and secondary windings respectively, which are directly turned outward to the outer shell 1 and then welded out, and the lead pins formed by the lead-out are isolated from the outer shell 1 by an insulating material;

[0023] At the same time, a thermistor 3 is also provided on one side of the magnetic core of the ferrite transformer 2. The metal lead at one end of the thermistor 3 is connected to the display control circuit through an external high temperature resistant AF line.

[0024] Furthermore, the outer shell 1 is processed from a whole piece of aluminum plate, and the internal shape is slightly larger than the outer contour structure of the ferrite transformer 2 contained therein. The ferrite transformer 2 can be completely placed inside the outer shell 1, and the magnetic core of the ferrite transformer 2 is fully fitted with the bottom surface of the outer shell 1. Four mounting brackets can be processed on the outside according to actual installation needs. In the present invention, the outer shell 1 is a sink-type structure, and the mounting bracket is located in the upper middle position of the outer shell 1.

[0025] Furthermore, the ferrite transformer 2 is a high-power ferrite transformer with a PM100 core structure. When working, the current reaches more than 20A, and the heat is quite large. Flat copper wires are used to wind the primary and secondary windings respectively, and then directly turned outward to the outer shell 1 for welding and lead-out. Note that the pins should not be in direct contact with the outer shell 1, and necessary insulation treatment should be taken.

[0026] Furthermore, the thermistor 3 is a standard component. The present invention uses MF52A103F3950 (A1), a small black head thermistor. R25 = 10kΩ, accuracy ±1%. It can accurately reflect the resistance change of -55°C to +125°C, and the accurate temperature value can be obtained by checking the specification of the component. In actual use, the metal lead of the thermistor is externally connected to the high temperature resistant AF line and then externally connected to the display control circuit, and the black head part is inserted into the uncured thermal conductive potting glue, and the measurement is carried out by sticking to the magnetic core of the ferrite transformer 2 or the lower surface of the outer shell 1.

[0027] Furthermore, the thermally conductive potting glue 4 is an auxiliary material. The thermally conductive potting glue 4 should be selected with a grade with a thermal conductivity coefficient of more than 1.3, composed of two components AB, and the ingredients should be prepared before use.

[0028] After the ferrite transformer 2 is placed in the outer shell 1, the gap between the ferrite transformer 2 and the outer shell 1 is filled with thermally conductive potting glue until the entire ferrite transformer 2 is submerged. If conditions permit, the potting glue should be vacuum-extracted to remove the air that cannot be exhausted in the future. This will improve the overall heat dissipation effect. After the thermally conductive potting glue is poured in for 15 minutes, insert the thermistor into the outer shell 1 and measure it against the core of the ferrite transformer 2 or the lower surface of the outer shell 1.

[0029] Embodiment 2

[0030] like Figure 2 As shown, this embodiment provides a built-in temperature monitoring method based on a heat dissipation structure, comprising the following steps:

[0031] Step S1: The potted ferrite transformer 2 and the outer shell 1 are fastened to the metal bracket and the cold plate in the equipment cabinet in the hydroacoustic field with screws, and at the same time, the bottom is ensured to be in good contact with the cold plate of the cabinet;

[0032] Step S2: Connect the input and output ends of the ferrite transformer 2 to the circuit printed board of the host computer, and connect the external high temperature resistant AF lead wire of the thermistor 3 to the display control circuit of the host computer;

[0033] Step S3: After the circuit of the ferrite transformer 2 is powered normally and starts to work for a period of time, the ferrite transformer 2 starts to generate heat under load, and the resistance value of the thermistor 3 is measured and displayed in real time by the resistance meter. After manual conversion, manual control is performed according to the situation, or the conversion is controlled by a computer program according to the resistance-temperature conversion table, and a real-time temperature display is given.

[0034] Specifically, in step S3, the relationship between manual and program control is: according to the subsequent temperature setting, when there is no over-temperature, the normal mark is displayed, and the computer program continues to control; when the safety temperature is exceeded, the alarm mark is displayed, and the engineer performs manual control according to the situation; and after a period of time, there is no intervention, the transformer temperature continues to rise and exceeds the limit setting temperature set by the program, then the program will automatically control and cut off the power supply.

[0035] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A heat dissipation structure based on a potted transformer, the heat dissipation structure is optimized for the use scenario of equipment circuits in the field of underwater acoustics, characterized in that: The invention comprises an outer shell (1), wherein a ferrite transformer (2) is arranged inside the outer shell (1), and the internal shape characteristics of the outer shell (1) are consistent with the outer contour structure of the ferrite transformer (2) accommodated therein, and a heat-conductive potting glue (4) for potting is arranged in the gap between the outer shell (1) and the ferrite transformer (2), and four mounting brackets are processed and arranged on the outer side of the outer shell (1); In the ferrite transformer (2), flat copper wires are used to wind the primary and secondary windings respectively, which are directly turned outward to the outer shell (1) and then welded and led out, and an insulating material is provided between the lead pins and the outer shell (1); At the same time, a thermistor (3) is also provided on one side of the magnetic core of the ferrite transformer (2), and a metal lead at one end of the thermistor (3) is connected to an external display control circuit via an external high-temperature resistant AF line.

2. The heat dissipation structure according to claim 1, characterized in that: The outer shell (1) is a component of a sink-type structure as a whole and is processed from a whole piece of aluminum plate.

3. The heat dissipation structure according to claim 1, characterized in that: The ferrite transformer (2) comprises a PM100 magnetic core structure, wherein the current during operation reaches above 20A.

4. The heat dissipation structure according to claim 1, characterized in that: The thermistor (3) is MF52A103F3950 (A1), R25 = 10 kΩ, and the accuracy is ±1%. Therefore, during the assembly and use of the thermistor (3), the black head portion at one end is inserted into the thermal conductive potting glue (4) that is not fully cured, and is attached to the lower surface of the magnetic core or the shell (1) of the ferrite transformer (2).

5. A built-in temperature monitoring method based on a heat dissipation structure, characterized in that: The steps include: Step S1: The potted ferrite transformer (2) and the outer shell (1) are fastened to the metal bracket and the cold plate in the equipment cabinet of the hydroacoustic field by screws; Step S2: Connect the input and output ends of the ferrite transformer (2) to the circuit printed board of the host computer, and connect the external high temperature resistant AF lead wire of the thermistor (3) to the display control circuit of the host computer; Step S3: After the circuit of the ferrite transformer (2) is powered normally and starts to work for a period of time, the ferrite transformer (2) starts to generate load heat, and the resistance value of the thermistor (3) is measured and displayed in real time by the resistance meter. After manual conversion, manual control is performed according to the situation, or the conversion is controlled by a computer program according to a resistance-temperature conversion table, and a real-time temperature display is given.

6. The temperature monitoring method according to claim 5, characterized in that: In step S3, the relationship between manual and program control is: according to the subsequent temperature setting, the normal mark is displayed when there is no over-temperature, and the computer program continues to control; when the safety temperature is exceeded, the alarm mark is displayed, and the engineer performs manual control according to the situation; and after a period of time, there is no intervention, the transformer temperature continues to rise and exceeds the limit setting temperature set by the program, then the program will automatically control and cut off the power supply.

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