CN103094890A - Flexible limited current circuit - Google Patents
Flexible limited current circuit Download PDFInfo
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- CN103094890A CN103094890A CN2011103483109A CN201110348310A CN103094890A CN 103094890 A CN103094890 A CN 103094890A CN 2011103483109 A CN2011103483109 A CN 2011103483109A CN 201110348310 A CN201110348310 A CN 201110348310A CN 103094890 A CN103094890 A CN 103094890A
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Abstract
The invention relates to the technical field of overcurrent protection of electricity power or an electronic circuit, in particular to a flexible limited current circuit. The flexible limited current circuit comprises a positive temperature coefficient (PTC) resistance PTC branch, a silicon carbide (SiC) nonlinear resistance SiC branch and a zinc oxide (ZnO) nonlinear resistor ZnO branch, wherein the resistance PTC branch, the nonlinear resistance SiC branch and the nonlinear resistor ZnO branch are connected in parallel. When the flexible limited current circuit is adopted to solve overcurrent problem of a circuit, the flexible limited current circuit is complete in function and has a self-protection function, maintenance is not needed, and safety of the circuit is greatly improved.
Description
Technical field
The present invention relates to electric power or electronic circuit current protection technology field, more specifically say a kind of flexible current-limiting circuit.
Background technology
Fuse majority that uses at present be disposable fuse, and when overcurrent and after fusing, the whole piece protected circuit just disconnects, the benefit of doing like this is safe, but brings simultaneously the shortcoming that the stability of a system is poor, replacing bothers.
In electronic system, also adopt positive temperature coefficient resistor PTC be the chief component element certainly recover the over-current protection device that fuse is used as circuit.Cross when being no more than safe current or not reaching the PTC operating temperature when link tester, positive temperature coefficient resistor is low resistance, does not substantially affect the normal operation of circuit; When the circuit overcurrent or when reaching the PTC operating temperature, PTC resistance moment several orders of magnitude that rise, thereby with the protected circuit blocking-up, and PTC returns to the normal temperature resistance and needs the regular hour, in this time course, circuit becomes high value to disconnect, and loses current path and makes circuit lose function; Certainly will cause PTC to continue keep high value and bear overvoltage and thermal breakdown if run into the overvoltage that continues the long period; Can cause the PTC insulation breakdown if run into the higher overvoltage of peak value, the whole piece circuit is brought potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of flexible current-limiting circuit with non-maintaining, perfect in shape and function, oneself safety protection function.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of flexible current-limiting circuit, have positive temperature coefficient resistor PTC branch road, silicon carbide nonlinear resistor SiC branch road, znr ZnO branch road, three resistance branch connect side by side.
Wherein positive temperature coefficient resistor PTC props up route and has protection and be swift in motion, and self can recover the PTC chip series, parallel of characteristics or string and the mode of combination and combine, and PTC chip material can be divided into polymer electrolyte, ceramic mould.
Positive temperature coefficient resistor SiC props up that the route leakage current is large, residual voltage is high, the mode of non-linear poor, thermal capacitance measured SiC chip series, parallel or string and combination combines.
Znr ZnO props up that the route leakage current is minimum, residual voltage is low, non-linear good ZnO chip series, parallel or the mode of string and combination combine.
After flexible current-limiting circuit of the present invention was sealed in protected circuit, when being no more than normal running current or not reaching the PTC operating temperature, PTC was low resistance, and flexible current-limiting circuit does not affect the normal operation of circuit substantially; When the special circumstances such as voltage fluctuation occurring, when surpassing normal running current and reaching the PTC operating temperature, positive temperature coefficient resistor PTC branch road will be blocked, and current transfer produces self pressure drop and limits circuit by larger electric current to positive temperature coefficient resistor SiC branch road and on branch road two ends; In the situations such as instantaneous high pressure, znr ZnO branch road can be limited in the flexible current-limiting circuit both end voltage reduced levels when occurring, and plays the effect of overvoltage protection.
The invention has the beneficial effects as follows: adopt the present invention solve circuit cross flow problem the time, this flexible current-limiting circuit perfect in shape and function and have the autoprotection function does not need to be serviced, and has greatly improved the fail safe of circuit.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 is another embodiment of the present invention.
In figure: 1. positive temperature coefficient resistor PTC branch road; 2. silicon carbide nonlinear resistor SiC branch road; 3. znr ZnO branch road.
Embodiment
Flexible current-limiting circuit structural representation of the present invention as shown in Figure 1 has positive temperature coefficient resistor PTC branch road 1, silicon carbide nonlinear resistor SiC branch road 2,3, three resistance branch of znr ZnO branch road and connects side by side.
Wherein positive temperature coefficient resistor PTC branch road 1 is swift in motion by having protection, self can recover the PTC chip series, parallel of characteristics or the mode of string and combination and combine, and PTC chip material can be divided into polymer electrolyte, ceramic mould.
Silicon carbide nonlinear resistor SiC branch road 2 is large by leakage current, residual voltage is high, the mode of non-linear poor, thermal capacitance measured SiC chip series, parallel or string and combination combines.
Change that zinc nonlinear resistance ZnO branch road 3 is minimum by leakage current, residual voltage is low, non-linear good ZnO chip series, parallel or the mode of string and combination combine.
As shown in Figure 1: positive temperature coefficient resistor PTC branch road 1 is when being no more than normal running current or not reaching the PTC operating temperature, and PTC is low resistance, and flexible current-limiting circuit does not affect the normal operation of circuit substantially; When the special circumstances such as voltage fluctuation occurring, when surpassing normal running current and reaching the PTC operating temperature, positive temperature coefficient resistor PTC branch road 1 will be blocked.
After 1 blocking-up of positive temperature coefficient resistor PTC branch road, the flexible current-limiting circuit both end voltage will rise, utilize the large characteristics of SiC leakage current, can be with the current transfer in positive temperature coefficient resistor PTC branch road 1 to self, and due to the higher characteristics of SiC residual voltage, the voltage at flexible current-limiting circuit two ends is slightly raised, and the function of protected circuit is preserved and protected like this; Recover normal when system, PTC will recover cold conditions gradually, and electric current is gained again in positive temperature coefficient resistor PTC branch road 1, and whole process does not impact circuit, and the current limliting process is soft, plays the effect of overvoltage protection.
When 2 normal operation of positive temperature coefficient resistor PTC branch road 1 and silicon carbide nonlinear resistor SiC branch road, to have a leakage current little due to znr ZnO branch road 3, substantially do not affect other two branch road work; When silicon carbide nonlinear resistor SiC branch road 2 owing to flowing through destructive electric current and make residual voltage higher than positive temperature coefficient resistor PTC branch road 1 tolerance range, utilize the fabulous characteristics of ZnO nonlinear characteristic, can be with the limiting voltage at flexible current-limiting circuit two ends in rational scope.
As shown in Figure 2: when the present invention is applied to take the overvoltage precautionary measures or does not cause positive temperature coefficient resistor PTC and silicon carbide nonlinear resistor SiC damages and electric current is no more than in the low voltage circuit such as protected device limit of tolerance, can reduce znr ZnO branch road 3.
Claims (5)
1. flexible current-limiting circuit, it is characterized in that: have positive temperature coefficient resistor PTC branch road, silicon carbide nonlinear resistor SiC branch road, znr ZnO branch road, three resistance branch connect side by side.
2. flexible current-limiting circuit according to claim 1 is characterized in that: described positive temperature coefficient resistor PTC props up route to have protection and is swift in motion, and self can recover the PTC chip series, parallel of characteristics or the mode of string and combination and combine.
3. flexible current-limiting circuit according to claim 1 is characterized in that: described silicon carbide nonlinear resistor SiC props up that the route leakage current is large, residual voltage is high, the mode of non-linear poor, thermal capacitance measured SiC chip series, parallel or string and combination combines.
4. flexible current-limiting circuit according to claim 1 is characterized in that: described znr ZnO props up that the route leakage current is minimum, residual voltage is low, non-linear good ZnO chip series, parallel or the mode of string and combination combine.
5. flexible current-limiting circuit according to claim 2, it is characterized in that: described PTC chip material is polymer electrolyte and ceramic mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103483109A CN103094890A (en) | 2011-11-02 | 2011-11-02 | Flexible limited current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103483109A CN103094890A (en) | 2011-11-02 | 2011-11-02 | Flexible limited current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103094890A true CN103094890A (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103483109A Pending CN103094890A (en) | 2011-11-02 | 2011-11-02 | Flexible limited current circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN103094890A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6157290A (en) * | 1998-01-09 | 2000-12-05 | Abb Research Ltd. | Resistor element |
| CN1367512A (en) * | 2002-02-10 | 2002-09-04 | 朱仲彦 | Magnetic breaking technique of excitation system of large power generator set |
| CN2779570Y (en) * | 2004-10-08 | 2006-05-10 | 朱仲彦 | High energy ZnO and PTC compound component |
| CN201498988U (en) * | 2009-10-10 | 2010-06-02 | 朱仲彦 | ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection |
| CN202285325U (en) * | 2011-11-02 | 2012-06-27 | 上官春轶 | Flexible current-limiting circuit |
-
2011
- 2011-11-02 CN CN2011103483109A patent/CN103094890A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6157290A (en) * | 1998-01-09 | 2000-12-05 | Abb Research Ltd. | Resistor element |
| CN1367512A (en) * | 2002-02-10 | 2002-09-04 | 朱仲彦 | Magnetic breaking technique of excitation system of large power generator set |
| CN2779570Y (en) * | 2004-10-08 | 2006-05-10 | 朱仲彦 | High energy ZnO and PTC compound component |
| CN201498988U (en) * | 2009-10-10 | 2010-06-02 | 朱仲彦 | ZnO and SiC compound circuit used for arc extinction, harmony extinction and overvoltage protection |
| CN202285325U (en) * | 2011-11-02 | 2012-06-27 | 上官春轶 | Flexible current-limiting circuit |
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| ASS | Succession or assignment of patent right |
Owner name: CHANGZHOU BAYI ELECTRICAL APPLIANCE FACTORY CO., L Free format text: FORMER OWNER: SHANGGUAN CHUNYI Effective date: 20130823 |
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Free format text: CORRECT: ADDRESS; FROM: 213100 CHANGZHOU, JIANGSU PROVINCE TO: 213022 CHANGZHOU, JIANGSU PROVINCE |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20130823 Address after: 213022 No. 28 ERON Middle Road, Xinbei District, Jiangsu, Changzhou Applicant after: Changzhou Bonrey Electrical Co., Ltd. Address before: 213100 Jiangsu city of Changzhou province Wujin Nanxiashu Street No. 19 new North Applicant before: SHANGGUAN CHUNYI |
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Application publication date: 20130508 |