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Thermal protection type piezoresistor with controlled device

A varistor and controlled device technology, applied in varistors, overvoltage protection resistors, resistors, etc., can solve problems such as the inability to actively disconnect the circuit and the inability of the thermal fuse to sense the varistor in time. Avoid the effect of fire

Pending Publication Date: 2022-05-20
肃菲(江苏)电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the cracking location of the varistor cannot be predicted, the thermal fuse may not be able to detect the abnormality of the varistor in time, and cannot actively disconnect the circuit in advance when the varistor is aging or cracking, and cannot completely avoid the cracking of the varistor. The hidden danger of fire in the varistor and other components or casings enclosing the varistor

Method used

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  • Thermal protection type piezoresistor with controlled device
  • Thermal protection type piezoresistor with controlled device
  • Thermal protection type piezoresistor with controlled device

Examples

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Effect test

Embodiment 1

[0036] see figure 1 and figure 2 , the present invention provides a thermally protected varistor with a controlled device, the thermally protected varistor with a controlled device includes a housing 1, a varistor 2, a thermal fuse 3, a heating device 4, a control device 5, the first lead-out electrode 6 and the second lead-out electrode 7, one of the pins of the thermal fuse 3 is connected in series with one of the pins of the varistor 2, and the other pin of the varistor 2 It is connected to the first lead-out electrode 6 , the other pin of the thermal fuse 3 is connected to the second lead-out electrode 7 , and the first lead-out electrode 6 and the second lead-out electrode 7 extend out of the housing 1 . Wherein, the heating device 4 is attached to the thermal fuse 3 , the heating device 4 is electrically connected to the control device 5 , and the control device 5 controls the heating device 4 to heat up so that the thermal fuse 3 is blown.

[0037] More specifically,...

Embodiment 2

[0043] see Figure 5 , the structure of a thermally protected varistor with a controlled device in this embodiment is basically the same as that of Embodiment 1, the difference is that the control device 5 is installed in the housing 12 and cannot communicate through optical communication or For other direct communication control, in this embodiment, the control device 5 is turned on by installing an APP program built into the chip and by external wireless control or wired electrical control. Embodiment 1 and Embodiment 2 are both single-line control methods, that is, the external detection device is used to detect the abnormal overcurrent or abnormal temperature of the piezoresistor, and then the APP program is used to remotely control the opening of the heating device.

Embodiment 3

[0045] see Figure 6 In this embodiment, a thermally protected varistor with a controlled device has basically the same structure as that of Embodiment 1, the difference is that the control device 5 is a two-wire control, and the control device 5 includes a temperature rise control module ( not shown in the figure) and a piezoresistor detection module (not shown in the figure), the temperature rise control module controls the heating device 4 to achieve rapid temperature rise, and the piezoresistor detection module detects the current or temperature of the piezoresistor 2, The temperature rise control module controls the opening of the temperature rise device 4 according to the detection result of the piezoresistor detection module. Compared with the single-line control, the two-line control can enable the control 5 to obtain data on the abnormal current or temperature of the varistor 2 in a shorter time, open the heating device 4 faster and disconnect the thermal fuse 3, and ...

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Abstract

The thermal protection type piezoresistor with the controlled device comprises a shell, a piezoresistor body, a temperature fuse, a temperature rising device and a control device, and one pin of the temperature fuse is connected with one pin of the piezoresistor body in series. The other pin of the piezoresistor and the other pin of the temperature fuse serve as extraction 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 the temperature so that the temperature fuse can be fused; the temperature rising device is controlled by the control device to rapidly rise temperature, and the temperature fuse connected with the piezoresistor in series is cut off, so that the piezoresistor is separated from a circuit, and the piezoresistor or a shell is prevented from catching fire caused by cracking of the piezoresistor.

Description

technical field [0001] The present invention relates to the technical field of electronic components, in particular to a heat-protected varistor with a controlled device, which can actively cut off the circuit of the varistor, and avoid the varistor caused by the cracking of the varistor and Other components or the housing enclosing the varistor could catch fire. Background technique [0002] Varistors are widely used, especially in circuit protection, such as when the power grid is overvoltage or lightning strikes, it can effectively prevent the damage of overvoltage to the application equipment. But for varistors, after the product itself is cracked or aged and fails, the leakage current of the product itself will increase, which will cause the temperature of the product to become higher and higher, resulting in a short circuit phenomenon. If it cannot be controlled in time, it will catch fire or even fire. Therefore, thermal protection varistors with various structures h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/10H01C7/12H01H85/04
CPCH01C7/10H01C7/12H01C7/126H01H85/04
Inventor 汪洋王维丛艳丽汪富敏
Owner 肃菲(江苏)电子科技有限公司
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