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Ceramic chip and low-limit voltage piezoresistor

A piezoresistor and piezoresistor technology, applied in piezoresistor cores, piezoresistors, resistors, etc., can solve the problems of long response time of discharge tubes, low inherent capacitance, and affecting protection effects

Active Publication Date: 2019-12-10
CHENGDU TIEDA ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to avoid circuit damage caused by power grid fluctuations by using a discharge tube in series with a varistor with a low-voltage sensitive voltage value in the prior art. The discharge tube enters the subsequent stage circuit before it is turned on, which seriously affects the protection effect. A ceramic chip and a low-limit voltage varistor are provided. The varistor passes two varistors and gas The connection of the discharge element, while achieving the purpose of low limit voltage, when the surge wave arrives, one of the varistors is turned on first. After the discharge tube is turned on, most of the surge current is absorbed by the other varistor. , so that the piezoresistor of the combination circuit has low limiting voltage, high conduction threshold and fast response time characteristics, and has the characteristics of low inherent capacitance, which can be used in higher frequency working occasions

Method used

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  • Ceramic chip and low-limit voltage piezoresistor
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  • Ceramic chip and low-limit voltage piezoresistor

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Low limiting voltage varistors, the principle of which is as figure 1 As shown, it includes a gas discharge element 3 and a first varistor U1 connected in parallel with the gas discharge element 3, and also includes a second varistor U2 with a lower varistor voltage value. The resistor U2 is connected in series with the parallel circuit, and the varistor voltage of the second varistor is between 150V and 500V.

[0060] The gas discharge element 3 is connected to the first piezoresistor U1 to form a parallel circuit, which not only includes electrical connection to form a parallel circuit, as shown in this embodiment, but also includes a direct connection to form a parallel circuit structure, as in Embodiment 2 and The structure shown in Embodiment 3 also includes the case where the integrated structure is designed to form a parallel circuit, as shown in Embodiment 4.

[0061] When the combined piezoresistor of this embodiment is connected to the power grid loop, the ga...

Embodiment 2

[0069] low limiting voltage varistors, such as figure 2 and image 3 As shown, it includes a gas discharge element 3 and a first varistor U1 connected in parallel with the gas discharge element, and also includes a second varistor U2 with a lower varistor voltage value, the second varistor U2 U2 is connected in series with the parallel circuit, and the electrode surface area of ​​the second piezoresistor U2 is larger than the electrode surface area of ​​the first piezoresistor U1. Due to the isolation effect of the gas discharge element 3, the varistor voltage value of the low limiting voltage varistor can be several specifications lower than when the varistor is used alone, so as to achieve the purpose of low limiting voltage, and the varistor with the gas discharge element 3 The purpose of the first varistor U1 connected in parallel is to conduct first at the beginning of the surge. At this time, the amplitude of the surge is not too high and the energy is not too large. T...

Embodiment 3

[0085] Such as Figure 6 and Figure 7 As shown, the ceramic chip (equivalent to the first ceramic chip 1 identified in the figure), the first electrode 11 and the second electrode 12 are arranged at both ends of the ceramic chip to form the first electrode surface and the second electrode surface, and the second electrode surface Located on the opposite side of the first electrode surface, the first electrode surface is provided with a cavity penetrating to the second electrode surface.

[0086] The first electrode surface and the second electrode surface described in this embodiment are just a plane and have no thickness, and the figure shows a schematic diagram of the arrangement of the electrodes. When the ceramic chip is applied, the first electrode 11 and the second electrode surface can be combined. The second electrode 12 is made into a structure that closes the middle cavity, and the first electrode 11 and the second electrode 12 can also be made into the structure s...

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Abstract

The invention relates to the technical field of piezoresistors and particularly relates to a ceramic chip and a low-limit voltage piezoresistor. The piezoresistor comprises a gas discharge element anda first piezoresistor connected with the gas discharge element to form a parallel circuit and further comprises a second piezoresistor with a lower piezovoltage value, wherein the second piezoresistor is connected with the parallel circuit in series. The piezoresistor is advantaged in that two ends of the gas discharge element are connected in parallel with the first piezoresistor and then are connected in series with the second piezoresistor with the low voltage-sensitive voltage value, and a purpose of absorbing a wave head with a steep surge is achieved by utilizing the rapid response time(less than 20ns) of the piezoresistor.

Description

technical field [0001] The invention relates to the technical field of varistors, in particular to a ceramic chip and a low-limit voltage varistor. Background technique [0002] As a safety component, varistors are suitable for circuit and electrical protection, especially widely used in low-frequency power circuits. During the use of varistors, it is required that the limiting voltage of varistors be as low as possible, that is, the protection level of varistors is required to be as high as possible, so that the protection of varistors can reduce the failure of the protected device. It also avoids requiring the protected device to increase the withstand voltage level, but the limiting voltage is determined by the varistor voltage of the varistor. The lower the varistor voltage, the lower the limiting voltage. The varistor voltage also represents the conduction threshold of the varistor. If the varistor voltage is too low, the safety of the varistor itself will be greatly a...

Claims

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Application Information

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IPC IPC(8): H01C13/02H01C7/105H01C1/14
CPCH01C13/02H01C7/105H01C1/14
Inventor 张治成叶磊詹俊鹄石小龙章俊龚述娟
Owner CHENGDU TIEDA ELECTRONICS CORP