CN217157853U - Thermal protection type piezoresistor with controlled device - Google Patents
Thermal protection type piezoresistor with controlled device Download PDFInfo
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- CN217157853U CN217157853U CN202220230438.9U CN202220230438U CN217157853U CN 217157853 U CN217157853 U CN 217157853U CN 202220230438 U CN202220230438 U CN 202220230438U CN 217157853 U CN217157853 U CN 217157853U
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- temperature fuse
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Abstract
The utility model discloses a thermal protection type piezo-resistor with controlled device includes shell, piezo-resistor, temperature fuse, rising temperature device and controlling means, one of them pin of temperature fuse and one of them pin of piezo-resistor are established ties, another pin of piezo-resistor and another pin of temperature fuse are as leading out the electrode and stretch out the shell; the temperature rising device is attached to the temperature fuse and electrically connected with the control device, and the control device controls the temperature rising device to rise so that the temperature fuse is fused; the utility model discloses a controlling means control rising temperature device rapid heating up cuts off the temperature fuse who establishes ties with piezo-resistor to make piezo-resistor break away from the circuit, avoid piezo-resistor or shell that piezo-resistor leads to because the cracking to catch fire.
Description
Technical Field
The utility model relates to an electronic components technical field especially relates to a thermal protection type piezo-resistor with controlled device, can initiatively cut off piezo-resistor's circuit, avoids piezo-resistor because the cracking leads to piezo-resistor and other subassemblies or the shell that seal piezo-resistor catch fire.
Background
The piezoresistor has wide application, and can effectively prevent overvoltage from damaging application equipment particularly in the aspect of circuit protection, such as overvoltage or lightning stroke of a power grid. However, for the voltage dependent resistor, after the product is cracked or aged to lose efficacy, the leakage current of the product is increased, so that the product temperature is increased to cause short circuit, and if the short circuit is not controlled in time, the product can catch fire or even fire. Therefore, thermal protection type piezoresistors with various structures appear in the market, a temperature fuse is mainly connected in series with the piezoresistor, the temperature fuse generally comprises an electrode pin, a shell, a fluxing agent and fusible gold, the shell is wrapped by fusible alloy coated with a fluxing agent element, the electrode pin is connected with the fusible alloy, and then the piezoresistor is connected in series with the electrode pin to realize electrical and thermal interconnection. The temperature fuse senses the temperature of the piezoresistor mainly through low-temperature fusible alloy, and when the temperature of the piezoresistor is too high, the piezoresistor shrinks to two ends with the help of the fluxing medium to break a circuit.
However, the temperature fuse can be fused to achieve the effect of breaking the circuit only when the temperature sensing material senses the abnormal rise of the temperature of the piezoresistor through the shell or the pin, and the temperature fuse belongs to passive disconnection. However, since the cracking position of the varistor cannot be predicted, the temperature fuse may not sense the abnormality of the varistor in time, and cannot actively disconnect the circuit in advance when the varistor is aged or cracked, so that the hidden danger that the varistor, other components or a housing enclosing the varistor catch fire due to cracking of the varistor cannot be completely avoided.
SUMMERY OF THE UTILITY MODEL
The main object of the present invention is to overcome the above disadvantages and shortcomings of the prior art, and to provide a thermal protection type varistor with a controlled device.
A thermal protection type piezoresistor with a controlled device comprises a shell, a piezoresistor, a temperature fuse, a heating device and a control device, wherein one pin of the temperature fuse is connected with one pin of the piezoresistor in series, and the other pin of the piezoresistor and the other pin of the temperature fuse are taken as extraction electrodes to extend out of the shell; the temperature rising device is attached to the temperature fuse, the temperature rising device is electrically connected with the control device, and the control device controls the temperature rising device to rise temperature so that the temperature fuse is fused.
In one embodiment, the thermal protection type piezoresistor with the controlled device comprises a shell, a piezoresistor, a temperature fuse, a temperature raising device, a control device, a first extraction electrode and a second extraction electrode, wherein one pin of the temperature fuse is connected with one pin of the piezoresistor in series, the other pin of the piezoresistor is connected with the first extraction electrode, the other pin of the temperature fuse is connected with the second extraction electrode, and the first extraction electrode and the second extraction electrode extend out of the shell; the temperature rising device is attached to the temperature fuse, the temperature rising device is electrically connected with the control device, and the control device controls the temperature rising device to rise temperature so that the temperature fuse is fused.
After thermal protection type piezo-resistor took place to crack or age, piezo-resistor's leakage current grow, but piezo-resistor is still not enough to make temperature fuse break because the produced temperature of leakage current, the utility model discloses an increase rising temperature device and controlling means, detect piezo-resistor current abnormity or temperature anomaly through controlling means, control adds rising temperature device initiative and heaies up and make temperature fuse break to avoid piezo-resistor to take place the short circuit or even the conflagration of starting a fire.
In one embodiment, the heating device is a heating plate, the heating plate is attached to one surface of the temperature fuse, and the heating plate is electrically connected with the control device.
In one embodiment, the temperature raising device is a thick film electrothermal resistor or a PI heating sheet or a PI electric heating sheet. The thick film electrothermal resistor has the advantages of light weight, high thermal efficiency, high heating speed, long service life, high mechanical strength and the like.
In one embodiment, the temperature raising device comprises a heating panel, two heating side plates and a heating back plate, and the heating panel, the two heating side plates and the heating back plate attach four surfaces of the temperature fuse.
In one embodiment, the temperature raising device is a PI heating film or a PI electric heating film.
The temperature fuse is a square-shell type temperature fuse or a porcelain tube type temperature fuse. The temperature rising device is in a surface heating mode, has the advantages of being high in heat efficiency, energy-saving, electricity-saving, fast in temperature rising, small in thermal inertia and the like, soft in material, capable of surrounding the temperature fuse and enabling the temperature fuse to be attached to the temperature fuse more tightly, and capable of enabling the surrounding temperature of the temperature fuse to rise rapidly.
In one embodiment, the housing includes a bottom plate and a casing, the piezoresistor and the temperature fuse are mounted on the bottom plate, the casing surrounds the piezoresistor, the temperature fuse and the temperature raising device, the control device is mounted in the casing, and the first extraction electrode and the second extraction electrode extend out of the bottom plate.
In one embodiment, the control device comprises a temperature rise control module and a piezoresistor detection module, the temperature rise control module controls the temperature rise device to realize rapid temperature rise, the piezoresistor detection module detects the current or the temperature of the piezoresistor, and the temperature rise control module controls the temperature rise device to be turned on according to the detection result of the piezoresistor detection module.
In one embodiment, the housing includes a bottom plate and a casing, the piezoresistor and the temperature fuse are mounted on the bottom plate, the casing surrounds the piezoresistor, the temperature fuse and the temperature raising device, the control device is mounted outside the casing, and the first extraction electrode and the second extraction electrode extend out of the bottom plate.
In one embodiment, the control device includes a temperature rise control module, the temperature rise control module controls the temperature rise device to achieve rapid temperature rise, the temperature rise control module is a light control module, and a photosensitive sensor is arranged on the temperature rise control module.
In one embodiment, the temperature rise control module is a voice control module.
In one embodiment, the thermal fuse comprises a fuse housing, a fluxing agent element and a fusible alloy element, the housing surrounds the fluxing agent element, the fluxing agent element surrounds the fusible alloy element, and the fusible alloy element connects two pins of the thermal fuse.
In one embodiment, the housing is made of one or a combination of plastic, ceramic and ceramic glass.
The utility model discloses heat protection type piezo-resistor with controlled device beneficial effect lies in: when the control device or other external detection devices detect that the piezoresistor is cracked, the control device can remotely control the heating device to rapidly heat up and cut off the temperature fuse connected with the piezoresistor in series, so that the piezoresistor is separated from the circuit, and the piezoresistor caused by cracking and other components or shells for packaging the piezoresistor are prevented from catching fire.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a thermal protection type varistor with a controlled device according to the present invention;
FIG. 2 is an exploded view of the thermal protection varistor of FIG. 1 with a controlled device;
FIG. 3 is a schematic circuit diagram of the thermally protected varistor with controlled device of the present invention;
FIG. 4 is a schematic diagram of a portion of the thermal protection varistor of FIG. 1 with a controlled device;
FIG. 5 is a schematic diagram of a second embodiment of a thermal protection type varistor with a controlled device according to the present invention;
FIG. 6 is a schematic diagram of a third embodiment of a thermally protected varistor with a controlled device according to the present invention;
FIG. 7 is a schematic diagram of a fourth embodiment of a thermal protection type varistor with a controlled device according to the present invention;
FIG. 8 is a schematic diagram of a fifth embodiment of a thermally protected varistor with a controlled device according to the present invention;
fig. 9 is a schematic diagram of a sixth embodiment of a thermally protected varistor with a controlled device according to the present invention;
fig. 10 is a schematic diagram of a seventh embodiment of a thermally protected varistor with a controlled device according to the present invention;
fig. 11 is a schematic diagram of an embodiment eight of the thermal protection type varistor with controlled device according to the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
Referring to fig. 1 and 2, the present invention provides a thermal protection type varistor with a controlled device, which includes a housing 1, a varistor 2, a temperature fuse 3, a temperature raising device 4, a control device 5, a first extraction electrode 6 and a second extraction electrode 7, wherein one pin of the temperature fuse 3 is connected in series with one pin of the varistor 2, another pin of the varistor 2 is connected with the first extraction electrode 6, another pin of the temperature fuse 3 is connected with the second extraction electrode 7, and the first extraction electrode 6 and the second extraction electrode 7 extend out of the housing 1. The heating device 4 is attached to the temperature fuse 3, the heating device 4 is electrically connected with the control device 5, and the control device 5 controls the heating device 4 to heat up so that the temperature fuse 3 is fused.
More specifically, referring to fig. 2, the housing 1 includes a bottom plate 11 and a casing 12, the varistor 2 and the temperature fuse 3 are mounted on the bottom plate 11, the casing 12 surrounds the varistor 2, the temperature fuse 3 and the temperature raising device 4, the control device 5 is mounted outside the casing 12, and the first leading-out electrode 6 and the second leading-out electrode 7 extend out of the bottom plate.
Referring to fig. 2 and 3, fig. 3 is a simple diagram of the circuit control of the present invention, in which the control device 5 includes a temperature raising control module, and the temperature raising control module controls the temperature raising device 4 to realize rapid temperature raising to fuse the temperature fuse 3. The control module that rises temperature is light-operated module, be equipped with photosensitive sensor (not shown) on the control module that rises temperature, because controlling means 5 is located the outside of casing 12, casing 12 can not block optical communication's route, and the mode through optical communication controls the opening of the control module that rises temperature, and this kind of mode optical communication control mode belongs to optical communication's conventional application, and this application is no longer repeated.
More specifically, referring to fig. 2, the temperature raising device 4 is a heating plate, the heating plate is attached to one surface of the thermal fuse 3, and the heating plate is electrically connected to the control device 5. Wherein, the heating plate is a thick film electric heating resistor or a PI heating sheet or a PI electric heating sheet. The PI heating sheet or the PI electric heating sheet is in a surface heating mode and has the advantages of being high in heat efficiency, energy-saving, electricity-saving, fast in temperature rising, small in thermal inertia and the like.
More specifically, referring to fig. 4, the thermal fuse 3 includes a fuse housing 31, a fluxing agent element 32, and a fusible alloy element 33, the housing 31 surrounds the fluxing agent element 32, the fluxing agent element 32 surrounds the fusible alloy element 33, and the fusible alloy element 33 is connected to two pins of the thermal fuse 3. The temperature fuse 3 has different structures, the contact area of the pin on the fusible alloy element is increased to improve the heat conduction efficiency, or the heat conduction efficiency is increased by other modes, the temperature fuse belongs to the selection of the technical personnel in the field according to different temperature fuses, and the more specific structure of the temperature fuse is not described in detail in the application.
In the prior art, the cracking position or the breakdown position of the piezoresistor has a certain distance with the position of the thermal protector, and the leakage current of the piezoresistor becomes large after the piezoresistor is cracked, so that the temperature fuse cannot feel the temperature of the piezoresistor or the temperature of the piezoresistor is not enough to break the temperature fuse, and the circuit of the piezoresistor cannot be cut off in time. When the temperature-sensitive fuse is used, induction detection is performed through a device for detecting current in a non-contact mode, namely a detection device in an external environment, which is not shown in the drawing of the embodiment, after the cracking or leakage current abnormality of the piezoresistor is detected, the control device controls the heating device which is connected and attached to the temperature fuse to be conducted and actively heated, and the temperature of the heating device is increased in a short time to fuse the temperature fuse, so that the circuit of the piezoresistor is cut off, and the short circuit and even the fire of the piezoresistor are avoided.
Example two
Referring to fig. 5, the structure of the thermal protection type varistor with the controlled device in this embodiment is substantially the same as that of the first embodiment, and the difference is that the control device 5 is installed in the housing 12 and cannot be controlled by optical communication or other direct communication methods, and in this embodiment, the control device 5 is turned on by installing a chip built-in APP program and by an external wireless control or wired electrical control method. The first embodiment and the second embodiment are both in a single-wire control mode, namely, an external detection device is used for sensing and detecting the overcurrent abnormal condition or the temperature abnormal condition of the piezoresistor, and then an APP program is used for remotely operating and controlling the starting of the temperature rising device.
EXAMPLE III
Referring to fig. 6, in this embodiment, a thermal protection type varistor with a controlled device has a structure substantially the same as that of the first embodiment, and a difference is that the control device 5 is a two-wire control, the control device 5 includes a temperature rise control module (not shown) and a varistor detection module (not shown), the temperature rise control module controls the temperature rise device 4 to realize rapid temperature rise, the varistor detection module detects a current or a temperature of the varistor 2, and the temperature rise control module controls the temperature rise device 4 to be turned on according to a detection result of the varistor detection module. Compared with single-wire control, the two-wire control can enable the control 5 to acquire data of current or temperature abnormality of the piezoresistor 2 in a shorter time, and the temperature rising device 4 is started to disconnect the temperature fuse 3 more quickly, so that the piezoresistor 2 is prevented from catching fire.
Example four
Referring to fig. 7, a thermal protection type varistor with a controlled device in this embodiment has a structure substantially the same as that of the first embodiment, except that the control device 5 is a two-wire control device and the control device 5 is installed in the housing 12, the control device 5 includes a temperature-raising control module (not shown) and a varistor detection module (not shown), the temperature-raising control module controls the temperature-raising device 4 to achieve rapid temperature raising, the varistor detection module detects a current or a temperature of the varistor 2, and the temperature-raising control module controls the temperature-raising device 4 to be turned on according to a detection result of the varistor detection module. Controlling means 5 can't open through optical communication or other direct communication mode control, and controlling means 5 opens through outside wireless control or wired electric control mode through installing the built-in APP procedure of chip in this embodiment.
EXAMPLE five
Referring to fig. 8, the structure of the thermal protection type varistor with the controlled device in this embodiment is substantially the same as that of the first embodiment, except that the control device 5 is installed in the housing 12 and the structure of the temperature raising device 4 is different, the temperature raising device 4 includes a heating panel 41, two heating side plates 42 and a heating back plate 43, the heating panel 41, the two heating side plates 42 and the heating back plate 43 attach four sides of the thermal fuse 3, that is, the heating panel 41, the two heating side plates 42 and the heating back plate 43 enclose the thermal fuse 3, compared with the single-side attaching manner, the enclosing manner enables the temperature at the periphery of the thermal fuse 3 to be rapidly raised, and the thermal fuse 3 is blown out in a shorter time. The heating device 4 is a PI heating film or a PI electric heating film, the PI heating film or the PI electric heating film is in a surface heating mode, and the heating device has the advantages of being high in heat efficiency, energy-saving, electricity-saving, fast in heating, small in thermal inertia and the like, and the temperature fuse 3 can be conveniently surrounded by soft materials, so that the temperature fuse is attached more tightly, and the heat conduction efficiency is higher.
EXAMPLE six
Referring to fig. 9, the thermal protection type varistor with a controlled device in this embodiment is substantially the same as the first embodiment, except that the structure of the temperature raising device 4 is different, the temperature raising device 4 includes a heating panel 41, two heating side plates 42 and a heating back plate 43, and the heating panel 41, the two heating side plates 42 and the heating back plate 43 attach four surfaces of the thermal fuse 3, that is, the heating panel 41, the two heating side plates 42 and the heating back plate 43 enclose the thermal fuse 3, and compared with the single-surface attaching manner, the enclosing manner enables the temperature at the periphery of the thermal fuse 3 to be rapidly raised, and the thermal fuse 3 is blown out in a shorter time.
EXAMPLE seven
Referring to fig. 10, a thermal protection type varistor with a controlled device in this embodiment is basically the same as the varistor in the first embodiment, except that the control device 5 is installed in the housing 12, the temperature raising device 4 has a different structure, and the control device 5 is controlled by two wires, where the control device 5 includes a temperature raising control module (not shown) and a varistor detection module (not shown), the varistor detection module may be a built-in temperature sensor for detecting the temperature of the casing of the varistor, the temperature raising control module controls the temperature raising device 4 to achieve rapid temperature raising, the varistor detection module detects the temperature of the varistor 2, and the temperature raising control module controls the temperature raising device 4 to be turned on according to a detection result of the varistor detection module.
The temperature raising device 4 comprises a heating panel 41, two heating side plates 42 and a heating back plate 43, wherein the heating panel 41, the two heating side plates 42 and the heating back plate 43 attach four surfaces of the temperature fuse 3, that is, the heating panel 41, the two heating side plates 42 and the heating back plate 43 enclose the temperature fuse 3, compared with a single-surface attaching mode, the enclosing mode enables the temperature of the periphery of the temperature fuse 3 to be raised rapidly, and the temperature fuse 3 is fused in a shorter time.
Example eight
Referring to fig. 11, the thermal protection type varistor with a controlled device in this embodiment is basically the same as the first embodiment, except that the structure of the temperature increasing device 4 is different and the control device 5 is a two-wire control, where the control device 5 includes a temperature increasing control module (not shown) and a varistor detection module (not shown), the varistor detection module is a built-in non-contact current sensor and is configured to detect a current of a casing of the varistor, when the current of the varistor is greater than 1mA, the temperature increasing control module controls the temperature increasing device 4 to turn on according to a detection result of the varistor detection module, and the temperature increasing control module controls the temperature increasing device 4 to achieve rapid temperature increase, so that the temperature around the temperature fuse 3 is rapidly increased, and the temperature fuse 3 is blown out in a shorter time.
All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A thermally protected varistor with a controlled device, comprising: the temperature control circuit comprises a shell, a piezoresistor, a temperature fuse, a heating device and a control device, wherein one pin of the temperature fuse is connected with one pin of the piezoresistor in series, and the other pin of the piezoresistor and the other pin of the temperature fuse are taken as leading-out electrodes and extend out of the shell; the temperature rising device is attached to the temperature fuse, the temperature rising device is electrically connected with the control device, and the control device controls the temperature rising device to rise temperature so that the temperature fuse is fused.
2. A thermally protected varistor with controlled means according to claim 1, wherein: the heating device is a heating plate, the heating plate is attached to one surface of the temperature fuse, and the heating plate is electrically connected with the control device.
3. A thermally protected varistor with controlled means according to claim 2, characterized in that: the temperature raising device is a thick film electrothermal resistor or a PI heating sheet or a PI electric heating sheet.
4. A thermally protected varistor with controlled means according to claim 1, wherein: the temperature rising device comprises a heating panel, two heating side plates and a heating back plate, and the four surfaces of the temperature fuse are attached to the heating panel, the two heating side plates and the heating back plate.
5. A thermally protected varistor with controlled means according to claim 4, characterized in that: the heating device is a PI heating film or a PI electric heating film.
6. A thermally protected varistor with controlled means according to claim 1, wherein: the temperature fuse is characterized by further comprising a first extraction electrode and a second extraction electrode, one pin of the temperature fuse is connected with one pin of the piezoresistor in series, the other pin of the piezoresistor is connected with the first extraction electrode, the other pin of the temperature fuse is connected with the second extraction electrode, and the first extraction electrode and the second extraction electrode extend out of the shell.
7. A thermally protected varistor with controlled means according to claim 6, characterized in that: the shell comprises a bottom plate and a shell, the piezoresistor and the temperature fuse are arranged on the bottom plate, the piezoresistor, the temperature fuse and the heating device are surrounded by the shell, the control device is arranged in the shell, and the first leading-out electrode and the second leading-out electrode extend out of the bottom plate.
8. A thermally protected varistor with controlled means according to claim 7, wherein: the control device comprises a temperature rise control module and a piezoresistor detection module, the temperature rise control module controls the temperature rise device to realize rapid temperature rise, the piezoresistor detection module detects the current or the temperature of the piezoresistor, and the temperature rise control module controls the temperature rise device to be turned on according to the detection result of the piezoresistor detection module.
9. A thermally protected varistor with a controlled device according to claim 6, wherein: the shell comprises a bottom plate and a shell, the piezoresistor and the temperature fuse are arranged on the bottom plate, the piezoresistor, the temperature fuse and the heating device are surrounded by the shell, the control device is arranged outside the shell, and the first leading-out electrode and the second leading-out electrode extend out of the bottom plate.
10. A thermally protected varistor with controlled means according to claim 9, wherein: the control device comprises a heating control module, the heating control module controls the heating device to realize rapid heating, the heating control module is a light control module, and a photosensitive sensor is arranged on the heating control module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220230438.9U CN217157853U (en) | 2022-01-27 | 2022-01-27 | Thermal protection type piezoresistor with controlled device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220230438.9U CN217157853U (en) | 2022-01-27 | 2022-01-27 | Thermal protection type piezoresistor with controlled device |
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| CN217157853U true CN217157853U (en) | 2022-08-09 |
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| CN202220230438.9U Active CN217157853U (en) | 2022-01-27 | 2022-01-27 | Thermal protection type piezoresistor with controlled device |
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- 2022-01-27 CN CN202220230438.9U patent/CN217157853U/en active Active
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