CN2307364Y - Program-controlled switchboard subscriber's line thick film protector - Google Patents
Program-controlled switchboard subscriber's line thick film protector Download PDFInfo
- Publication number
- CN2307364Y CN2307364Y CN 97239864 CN97239864U CN2307364Y CN 2307364 Y CN2307364 Y CN 2307364Y CN 97239864 CN97239864 CN 97239864 CN 97239864 U CN97239864 U CN 97239864U CN 2307364 Y CN2307364 Y CN 2307364Y
- Authority
- CN
- China
- Prior art keywords
- thick film
- thick
- protector
- ceramic substrate
- film resistors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a thick film protector for the subscriber's line of a program-controlled switchboard, comprising a ceramic substrate. Thick film resistors are printed on the ceramic substrate by a double-side parallel connection method. Moreover, one side of the ceramic substrate is provided with a thermistor connected with the thick film resistors in series. The synthesis resistance value of the protector is the sum of the resistance values of the thick film resistors and the resistance value of the thermistor. The utility model has the technical proposals of large area, both-side parallel connection and no resistance regulation. The integrality of the thick film resistors is ensured. Current can be evenly distributed on the thick film resistors. The power tolerance and the high-voltage-proof performance of the thick film resistors are increased. The utility model can well protect the program-controlled switchboard.
Description
The utility model belongs to the electric elements technical field, relates to a kind of stored-program control exchange subscribers feeder protective device.
Develop rapidly along with modern science and technology; the application of stored-program control exchange more and more widely; for avoiding device damage; protection problem to the stored-program control exchange subscribers feeder is also just more and more outstanding; its claimed circuit both can be struck by lightning (being the 1000V high pressure) by anti-secondary, anti-again civil power overlap joint (being the 220V alternating current).At present; all adopt both at home and abroad generally thick film circuit with laser resistor trimming protective device as the stored-program control exchange subscribers feeder; because traditional thick film circuit is to adopt the mode of laser trimming to improve the thick-film resistor precision; CURRENT DISTRIBUTION on the thick-film resistor is inhomogeneous; cause the resistance after laser resistor trimming to have certain defective; under high slightly voltage, occur spark phenomenon easily, influence the service behaviour and the life-span of device.
The purpose of this utility model is prior art is improved, thereby provides a kind of rational in infrastructure, dependable performance, can play the stored-program control exchange subscribers feeder thick film protector of good protection effect to switch.
The purpose of this utility model is achieved in that the thick film protector that is provided has a ceramic substrate; on ceramic substrate, be printed with thick-film resistor by two-sided parallel way; also be provided with a thermistor of connecting with thick-film resistor on a face of ceramic substrate, the combined resistance value of protector is thick-film resistor value and thermosensitive resistance sum.
The utility model designer is when the design thick-film resistor, broken the design philosophy that traditional method of passing through laser trimming improves the thick-film resistor precision, adopt large tracts of land, two-sided parallel connection and the technical scheme of resistance trimming not, mate by meticulous selection resistance slurry, strict control printing, sintering process and strictness and PTC stepping simultaneously and reach the high-precision requirement of resistance, so just guaranteed the integrality of thick-film resistor, electric current on the thick-film resistor is evenly distributed, thereby increased the power tolerance and the high voltage performance of thick-film resistor.
Below with reference to accompanying drawing the utility model content is described further.
Fig. 1 is the end view of a specific embodiment structure of the utility model.
Fig. 2 is the front view of Fig. 1 structure.
Fig. 3 is an electrical schematic diagram of the present utility model.
As shown in the figure; include a protective circuit that is composed in series by thick-film resistor 3 and thermistor 2 in the stored-program control exchange subscribers feeder thick film protector described in the utility model; thick-film resistor 3 is printed on the two sides of ceramic substrate 1 by two-sided parallel way; thermistor 2 is located on the single face of ceramic substrate 1 and makes it to connect with thick-film resistor 3 coupling; even the structural principle of this protector satisfies form shown in Figure 3, its combined resistance value R is thick-film resistor value R
1With thermosensitive resistance R
2Sum.Label 4 is the resistance pin in the accompanying drawing, in the actual fabrication structure, and thick-film resistor pin-pitch l on this protector
1With thermistor pin-pitch l
2Ratio be 7～8: 4.5～5.5.
Product described in the utility model detects through national departments concerned test, and every test index is all qualified, satisfies fully and has surpassed the K20 of Ministry of Posts and Telecommunications standard, plays a good protection in switch.
Claims (2)
1, a kind of stored-program control exchange subscribers feeder thick film protector; it is characterized in that having a ceramic substrate (1); upward be printed with thick-film resistor (3) at ceramic substrate (1) by two-sided parallel way; also be provided with a thermistor (2) of connecting with thick-film resistor (3) on a face of ceramic substrate (1), the combined resistance value (R) of protector is thick-film resistor value (R
1) and thermosensitive resistance (R
2) sum.
2, stored-program control exchange user thick film protector as claimed in claim 1 is characterized in that thick-film resistor pin-pitch (l on this protector
1) and thermistor pin-pitch (l
2) ratio be 7～8: 4.5～5.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239864 CN2307364Y (en) | 1997-09-15 | 1997-09-15 | Program-controlled switchboard subscriber's line thick film protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239864 CN2307364Y (en) | 1997-09-15 | 1997-09-15 | Program-controlled switchboard subscriber's line thick film protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2307364Y true CN2307364Y (en) | 1999-02-10 |
Family
ID=33949764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97239864 Expired - Fee Related CN2307364Y (en) | 1997-09-15 | 1997-09-15 | Program-controlled switchboard subscriber's line thick film protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2307364Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923930B (en) * | 2009-06-12 | 2011-08-24 | 深圳市安培盛科技有限公司 | Intelligent PTC (Positive Temperature Coefficient) overvoltage and overcurrent protector |
| CN110246640A (en) * | 2019-06-04 | 2019-09-17 | 陕西华经微电子股份有限公司 | A kind of hurtless measure resistance value method for repairing and regulating |
-
1997
- 1997-09-15 CN CN 97239864 patent/CN2307364Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923930B (en) * | 2009-06-12 | 2011-08-24 | 深圳市安培盛科技有限公司 | Intelligent PTC (Positive Temperature Coefficient) overvoltage and overcurrent protector |
| CN110246640A (en) * | 2019-06-04 | 2019-09-17 | 陕西华经微电子股份有限公司 | A kind of hurtless measure resistance value method for repairing and regulating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |