CN213068000U - Composite PTC thermistor with temperature measuring signal - Google Patents
Composite PTC thermistor with temperature measuring signal Download PDFInfo
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- CN213068000U CN213068000U CN202020477497.7U CN202020477497U CN213068000U CN 213068000 U CN213068000 U CN 213068000U CN 202020477497 U CN202020477497 U CN 202020477497U CN 213068000 U CN213068000 U CN 213068000U
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Abstract
The utility model relates to a circuit protection field especially relates to a take compound PTC thermistor of temperature measurement signal, take compound PTC thermistor of temperature measurement signal includes compound PTC thermistor and temperature sensor, compound PTC thermistor with thermal coupling between the temperature sensor. The technical scheme provided by the utility model, following advantage has: the composite PTC thermistor and the temperature sensor are fixed to form thermal coupling between the composite PTC thermistor and the temperature sensor, so that the temperature sensor can detect the temperature change of the composite PTC thermistor at the first time when overvoltage occurs, the power output is adjusted to protect a rear-stage circuit from being damaged, and the composite PTC thermistor and the temperature sensor can recover to work within a short time without power failure when the voltage recovers to be normal.
Description
Technical Field
The utility model relates to a circuit protection field especially relates to a take compound PTC thermistor of temperature measurement signal.
Background
The composite PTC thermistor is applied to a nonlinear power supply to perform overvoltage, overcurrent and lightning protection, when the composite PTC thermistor is in a protection state, the body surface temperature reaches about 140 ℃, and the PTC thermistor is in a high resistance state. At this time, the heat quantity for maintaining the surface temperature of the composite PTC thermosensitive body is changed from W to I2RT is generated, because R is in a high-resistance state, the current is only dozens of milliamperes, and the small current of the dozens of milliamperes cannot be usedThe normal working current of the rear-stage circuit is maintained, so the rear-stage circuit does not work. Meanwhile, R is in a high-resistance state, and shares a large voltage, so that the input voltage of the switching power supply is low, and in the nonlinear power supply, in order to maintain a constant power, the lower the voltage, the larger the current at the input terminal, that is, the larger the current flowing through the PTC is, and W is equal to I2It is known at RT that this large current will cause the composite type temperature-sensitive temperature to be higher, and thus the composite type PTC temperature-sensitive will not be recovered. How to make compound PTC thermistor's temperature monitor get up the back through reducing power output and make compound PTC thermistor appropriate withdraw from the protection state and make the normal power supply of back stage circuit just in the occasion of some inconvenient outage the utility model discloses the problem that solves. Therefore, it is desirable to provide a composite PTC thermistor with a temperature measuring signal, which can monitor the temperature of the composite PTC thermistor and rapidly exit the protection state when the voltage returns to normal by reducing the power output.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a composite PTC thermistor with a temperature measuring signal, which can monitor the temperature of the composite PTC thermistor.
In order to achieve the above object, the utility model provides a take compound PTC thermistor of temperature measurement signal, its characterized in that: the composite PTC thermistor with the temperature measuring signal comprises a composite PTC thermistor and a temperature sensor, and the composite PTC thermistor is thermally coupled with the temperature sensor.
Preferably, the temperature sensor comprises a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
Preferably, the temperature sensor comprises a positive temperature coefficient or negative temperature coefficient temperature compensation type thermistor.
Preferably, the composite PTC thermistor with temperature measurement signal further comprises a housing, and both the composite PTC thermistor and the temperature sensor are fixed in the housing.
Preferably, a partition plate for not blocking the flowing of the pouring sealant is arranged between the composite PTC thermistor and the temperature sensor.
Preferably, the composite PTC thermistor with temperature measurement signal further comprises a printed circuit board, the composite PTC thermistor and the temperature sensor are both fixed to the printed circuit board, the printed circuit board is provided with an electrical insulation groove, and the electrical insulation groove is arranged between the temperature sensor and the composite PTC thermistor.
The technical scheme provided by the utility model, following advantage has:
the composite PTC thermistor and the temperature sensor are fixed to form thermal coupling between the composite PTC thermistor and the temperature sensor, so that the temperature change of the composite PTC thermistor can be detected at the first time when overvoltage occurs, a rear-stage circuit is protected from being damaged by adjusting power output, and the composite PTC thermistor and the temperature sensor can recover to work within a short time without power failure when voltage recovers to be normal.
Drawings
Fig. 1 is a bottom view of a composite PTC thermistor according to an embodiment of the present invention;
FIG. 2 is a pin diagram of the components of FIG. 1;
FIG. 3 is a layout diagram of a PCB board of a composite PTC thermistor with a temperature measuring signal.
In the figure: 10. a housing; 20. a temperature sensor; 21. a first pin; 22. a second pin; 30. a composite PTC thermistor; 31. a pressure sensitive element; 311. a common terminal; 312. a third pin; 32. a thermosensitive element; 321. a fourth pin; 40. a composite PTC thermistor with a temperature measuring signal; 50. an electrically insulating slot; 60. A separator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. 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.
Referring to fig. 1 and 2, the present invention provides a composite PTC thermistor 40 with a temperature measurement signal, wherein the composite PTC thermistor 40 with a temperature measurement signal comprises a composite PTC thermistor 30 and a temperature sensor 20, the composite PTC thermistor 30 is coupled to the temperature sensor 20, and specifically, the composite PTC thermistor 30 is thermally coupled to the temperature sensor 20 and has a certain electrical insulation property. Preferably, the composite PTC thermistor 30 and the temperature sensor 20 are further fixed by potting adhesive and transfer heat; when the composite PTC thermistor 40 with the temperature measuring signal passes through a larger voltage or current, the composite PTC thermistor 30 generates heat, the heat of the composite PTC thermistor 30 is coupled to the temperature sensor 20, when the temperature of the temperature sensor rises to a certain value, the resistance value rises or falls, the output power is reduced by reaching a control threshold value, and the composite PTC thermistor accelerates the recovery process when the voltage or current is recovered to be normal.
Specifically, there is no electrical connection between the composite PTC thermistor 30 and the temperature sensor 20. However, the PTC thermistor 30 is thermally coupled to the temperature sensor 20, and the temperature of the temperature sensor 20 is increased or decreased by the thermal coupling, and in one embodiment, the temperature of the temperature sensor 20 is used as a control signal to control some functions of the power chip, so as to reduce the output power and prepare for the PTC thermistor 30 to exit the protection state.
The temperature sensor 20 can be a positive temperature coefficient or negative temperature coefficient thermistor used as a temperature sensor or temperature compensation, the temperature sensor 20 comprises a first pin 21 and a second pin 22, and the first pin 21 and the second pin 22 are nonpolar pins; for example, after the temperature of the temperature sensor 20 reaches a certain temperature, the resistance value between the temperature sensors 21 and 22 changes to control the power supply chip to reduce the output power.
The composite PTC thermistor 30 includes a pressure sensitive element 31 and a heat sensitive element 32, and the heat sensitive element 32 is electrically connected to the pressure sensitive element 31, and specifically, the composite PTC thermistor 30 may be a composite PTC thermistor. When the composite PTC thermistor 30 is subjected to a relatively large voltage or current, the pressure-sensitive element 31 and the heat-sensitive element 32 generate heat.
The temperature sensor 20 is attached to one side of the pressure sensitive element 31, and preferably, the temperature sensor 20 is attached to one side of the pressure sensitive element 31 away from the heat sensitive element 32, so as to realize the effect of improving the thermal coupling in the heat transfer between the composite type PTC thermistor 30 and the temperature sensor 20; preferably, the temperature sensor 20 is attached to the surface of the pressure-sensitive element 31, and it should be noted that the temperature sensor 20 may also be attached to the side of the heat-sensitive element 32, for example, the temperature switch 20 may also be attached to the side of the heat-sensitive element 32 away from the pressure-sensitive element 31. The heat generated by the pressure sensitive element 31 can be coupled directly to the temperature sensor 20 or can be coupled to the temperature sensor 20 via the heat sensitive element 32.
The first pole of the thermal element 32 is electrically connected with the first pole of the pressure-sensitive element 31 to form a common terminal 311, the second pole of the thermal element 32 is a fourth pin 321, and the second pole of the pressure-sensitive element 31 is a third pin 312.
The composite PTC thermistor 40 with the temperature measuring signal further comprises a shell 10, the composite PTC thermistor 30 and the temperature sensor 20 are fixed in the shell 10, and specifically, the composite PTC thermistor 30 and the temperature sensor 20 can be fixed in the shell 10 through sealing glue.
Alternatively, the housing may not be provided, wherein the composite PTC thermistor 40 with temperature measurement signal may include a printed circuit board, and the pressure-sensitive element 31, the temperature-sensitive element 32 and the temperature sensor 20 are thermally coupled via the printed circuit board. Preferably, the printed circuit board has an electrical insulation groove 50, the electrical insulation groove 50 is disposed between the temperature sensor 20 and the composite PTC thermistor 30, and the composite PTC thermistor and the temperature sensor meet the requirement of insulation and voltage resistance through a certain isolation measure, as shown in fig. 3, in order to enhance the electrical insulation of the strong current and the control signal, an insulation groove 50 is designed on the PCB board.
Specifically, the composite PTC thermistor 30 is attached to the temperature sensor 20 by a heat conductive adhesive; it should be noted that the composite PTC thermistor 30 and the temperature sensor 20 may be attached to each other by heat shrinking a heat shrinkable tube.
The following describes the manufacturing process of the composite PTC thermistor 40 with temperature measurement signal: the composite PTC thermistor 30 and the temperature sensor 20 are assembled in the case 10, and then the composite PTC thermistor 30 and the temperature sensor 20 are sealed in the case 10 by sealing compound.
The specific working principle of the composite PTC thermistor 40 with the temperature measuring signal is as follows: a composite PTC thermistor 40 with temperature measuring signal is electrically connected with the circuit to be protected, when the voltage applied on the protection circuit is too large, the transient current flowing through the chip of the pressure sensitive element 31 flows through the PTC thermistor 32, wherein the current flowing through the PTC thermistor 32 generates energy from W2 Rt to form heat accumulation, the transient current flowing through the pressure sensitive element 31 makes the pressure sensitive element 31 generate temperature rise, and the temperature rise is directly coupled to the temperature sensor 20 or is coupled to the temperature sensitive element 32 first and then coupled to the temperature sensor 20. When the overvoltage time is short, the energy of the overvoltage makes the whole temperature rise generated by the whole composite PTC thermistor 40 device with temperature measuring signals packaged together not enough to make the resistance value of the temperature sensor 20 change obviously and control the power supply chip to output power failure, and at the moment, the whole circuit works normally. When the overvoltage time is long, the energy generated by the overvoltage causes the resistance of the temperature sensor 20 to change significantly when the temperature of the entire protection device rises. The reduced power output is that no current continues to flow through the composite PTC thermistor 30 and the composite PTC thermistor 30 no longer generates heat. A composite PTC thermistor 40 with temperature measuring signal radiates heat through the surrounding air, when the whole temperature of the protection device is low to be near the normal resistance value of a temperature sensor 20, the power chip outputs normally, and the nonlinear power supply recovers the power supply of the post-stage circuit.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a take temperature measurement signal's compound PTC thermistor which characterized in that: the composite PTC thermistor with the temperature measuring signal comprises a composite PTC thermistor and a temperature sensor, and the composite PTC thermistor is thermally coupled with the temperature sensor.
2. A composite PTC thermistor with temperature measuring signal according to claim 1, characterized in that: the temperature sensor comprises a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
3. A composite PTC thermistor with temperature measuring signal according to claim 1, characterized in that: the temperature sensor comprises a positive temperature coefficient or negative temperature coefficient temperature compensation type thermistor.
4. A composite PTC thermistor with temperature measuring signal according to claim 1, characterized in that: the composite PTC thermistor with the temperature measuring signal further comprises a shell, and the composite PTC thermistor and the temperature sensor are fixed in the shell.
5. A composite PTC thermistor according to claim 4, with temperature measuring signal, characterized in that: and a partition plate used for not blocking the flowing of the pouring sealant is arranged between the composite PTC thermistor and the temperature sensor.
6. A composite PTC thermistor with temperature measuring signal according to claim 1, characterized in that: the composite PTC thermistor with the temperature measuring signal further comprises a printed circuit board, the composite PTC thermistor and the temperature sensor are both fixed on the printed circuit board, an electrical insulation groove is formed in the printed circuit board, and the electrical insulation groove is formed between the temperature sensor and the composite PTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020477497.7U CN213068000U (en) | 2020-04-03 | 2020-04-03 | Composite PTC thermistor with temperature measuring signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020477497.7U CN213068000U (en) | 2020-04-03 | 2020-04-03 | Composite PTC thermistor with temperature measuring signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213068000U true CN213068000U (en) | 2021-04-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020477497.7U Active CN213068000U (en) | 2020-04-03 | 2020-04-03 | Composite PTC thermistor with temperature measuring signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213068000U (en) |
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2020
- 2020-04-03 CN CN202020477497.7U patent/CN213068000U/en active Active
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