CN103346533A - Circuit structure with protection function - Google Patents
Circuit structure with protection function Download PDFInfo
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- CN103346533A CN103346533A CN2013102562013A CN201310256201A CN103346533A CN 103346533 A CN103346533 A CN 103346533A CN 2013102562013 A CN2013102562013 A CN 2013102562013A CN 201310256201 A CN201310256201 A CN 201310256201A CN 103346533 A CN103346533 A CN 103346533A
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Abstract
A circuit structure with a protection function comprises a power line (1) and is characterized in that a temperature current protector (100) is directly connected in series on the power line, comprises a bimetallic strip (40) and thermistors (50) connected in parallel at the two ends of the bimetallic strip (40), and is connected in series on a firing line of the power line. The circuit structure has the over-temperature over-current protection function, can prevent the bimetallic strip from automatically restoring after over-heat tipping off open circuit, from being capable of restoring only after socket power is cut off, and a power supply is switched on after temperature dropping, and is improved in safety. Moreover, the circuit is more sensitive on over-current protection. Further, the circuit structure is especially suitable for a circuit used for being connected with the temperature current protector (100) or the condition that rated current in a circuit branch is smaller than or equal to 9A, and can play a role of reliable protection.
Description
Technical field
The present invention relates to a kind of circuit structure, particularly relate to a kind of circuit structure with defencive function.
Background technology
What shield in traditional circuit structure is fuse, but fuse must just can reactivate after fusing in replacing, uses comparatively trouble; On power line, itself there are not other temperature protection and current protecting function, when ambient temperature raises and when overheated, when perhaps electric current is excessive, can't auto power off on such power line, do not have protective effect.Wearing and tearing or damage in various household electrical appliance and the shop equipment use, cause that circuit load is excessive, the electric wire wearing and tearing, the a series of faults of the damage of household electrical appliance and shop equipment cause that easily circuit generates heat or electric current is excessive, thereby burn out electric equipment even may cause appliance fire.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of circuit structure with protection easy to use.
For addressing the above problem, the invention provides a kind of circuit structure with defencive function, comprise power line, it is characterized in that, directly be in series with the temperature current protector on the described power line; Described temperature current protector comprises a bimetal leaf and is connected in parallel on a thermistor at its two ends.
Connect in the circuit of described temperature current protector or the circuit branch rated current less than 9A or equal 9A;
Described temperature current protector is connected on the live wire of described power line.
Described temperature current protector is provided with a metal base plate and the described metal shell with groove, the groove mouth of described base plate and described shell is relative and be buckled into a cavity with shell, insulate with insulating paper between described base plate and the described shell, described cavity is built-in with described bimetal leaf, one end of described bimetal leaf is electrically connected with described metal shell, the other end is provided with moving contact, be fixed with a fixed contact outstanding in the described cavity on the described base plate, described fixed contact passes the insulating paper of base plate one side and is corresponding with described moving contact, is electrically connected with fixed contact during described moving contact normality, when the bimetal leaf temperature is higher than set point, then leave fixed contact and disconnect electrical connection; One side of described thermistor is close to and is electrically connected on described base plate away from a side of shell, and the opposite side of described thermistor then is electrically connected with a metal clips, and this metal clips also is electrically connected with described shell, and thermistor and shell are compressed; Stretch out an electric connecting terminal respectively from described metal shell and described base plate, and insert on the described power line with these two electric connecting terminals.
Described electric connecting terminal is a section lead, and an end is welded on the described base plate or is electrically connected with base plate or shell on the described shell or by the wiring card on base plate or the shell, and the other end is connected with described power line.
Described thermistor is cuboid, and described metal clips middle part is bent into thermistor profile shape adapting, part and surrounds described thermistor, the metal clips two ends then outwards shell side to bending and be held in described shell both sides; Described every the insulating paper between base plate and shell to the side bending of base plate away from shell, the two ends perk, clamp the both sides of described thermistor.
The base plate of described temperature current protector adopts the cold-reduced sheet of iron nickel zinc alloy; Described shell adopts the deep-draw stretching cold-reduced sheet of iron nickel zinc alloy material; Described metal clips adopts stainless steel.
Because the present invention is at the power line of the circuit structure temperature current protector of having connected; the thermistor protector in parallel with bimetal leaf is connected on the power line; can set the rated current of this circuit; select protector according to the rated current that allows; exceed set point when ambient temperature occurring; or circuital current exceeds set point, but then temperature current protector open circuit connects, thereby plays a protective role.And than fuse, easy to use, do not need the electricity that broke to change again, and can use several thousand up to ten thousand times.Thermistor has certain conductive capability; the thermistor resistance is very big; when bimetal leaf is crossed thermal cutoff; at this moment electric current passes through from temperature-sensitive resistance; it is big that its resistance becomes rapidly; make in the loop electric current very little; be not enough to drive load, and thermistor energising back heating, heat passes to bimetal leaf; causing bimetal leaf to lower the temperature resets; must cut off the electricity supply, make thermistor outage and stop heating, wait for a few minutes; reclose power supply after the bimetal leaf cooling; at this moment bimetal leaf just can reset, and this reduces naturally with regard to the temperature of having been avoided bimetal leaf and makes socket automatically reset, and has namely realized the function that outage just can reset; so not only make circuit play overtemperature protection, and improved safety in utilization.Because thermistor PTC energising back self-heating, resistance increase exponentially, thereby realize protection, so used behind the thermistor current protection of circuit more responsive.
The temperature current protector adopts metal shell, metal base plate and the metal clips of conduction as conductor in the further technical scheme of the present invention; and utilize insulating paper to be base plate and casing insulation; adopt structure compact, ingenious easy row thermistor to be connected in parallel on the two ends of bimetal release; form a small and exquisite protector of being convenient to place in circuit; wherein; the adjacent bimetal leaf of thermistor, the heat that makes the thermistor energising produce can pass to bimetal leaf rapidly, and the protection effect is faster and better.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
Fig. 1 is the schematic diagram of excess temperature circuit overcurrent protection structure of the present invention.
Fig. 2 is the temperature current protector front view in the circuit structure of the present invention.
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the temperature current protector end view in the circuit structure of the present invention.
Embodiment
As shown in Figure 1, be the schematic diagram of excess temperature circuit overcurrent protection structure of the present invention, this circuit structure can be main circuit, also can circuit branch, be applicable to rated current more less than 9A usually or equal in the circuit of 9A.As shown in the figure, this circuit structure has power line 1, directly is in series with temperature current protector 100 on the described power line; Described temperature current protector 100 comprises a bimetal leaf 40 and is connected in parallel on a thermistor 50 at its two ends.Connecting described temperature current protector 100 is connected on the live wire of described power line usually.As this area general knowledge, this temperature current protector periphery has insulation protection usually, does not give unnecessary details.
Described temperature current protector 100 be one can be too high to electric current in the circuit; the protective device that circuit or ambient temperature play a protective role when overheated; shown in Fig. 2-4; it is provided with a rectangular flat plate shape conducting metal base plate 10 and a conducting metal shell 20; base plate is to be made by the cold-reduced sheet of iron nickel zinc alloy; conduction; good heat conduction effect; and non-corrosive; and shell 20 is made by deep-draw stretching cold-reduced sheet iron nickel zinc alloy material; this metal shell 20 has notch towards the groove 22 of base plate; described base plate 10 is buckled into a cavity with shell 20; insulate with insulating paper 30 between described base plate and the described shell; bimetal leaf 40 is arranged in the described cavity; the one end is electrically connected with described shell 20; electrical connection in the present embodiment is achieved in that the nearly middle part of described shell 20 outer surfaces is recessed to form an outstanding contact 23 in the cavity to inner surface; described bimetal leaf 40 corresponding ends are welded with the fixedly iron nail 41 of a conduction, and fixedly iron nail and described contact 23 weld together for these.The other end of described bimetal leaf 40 is moving contacts 42, and conduction fixed contact 12 of giving prominence to described cavity of fixing electrical connection on the described base plate 10, described fixed contact 12 passes the insulating paper 30 of base plate one side and is corresponding with described moving contact 42, is electrically connected with fixed contact 12 during described moving contact 42 normalities then to leave fixed contact and disconnect electrical connection when the bimetal leaf temperature is higher than set point; Reset for the ease of bimetal leaf, also be recessed to form an outstanding projection 25 in the cavity to inner surface at the outer surface of described shell, after bimetal leaf sound contact separates, that end of bimetal leaf moving contact withstands on the described projection 25, can not be close to the inner surface of shell, contact-making surface is little, helps to reset.
As shown, what one side of the PTC thermistor 50 of a cuboid was electrically connected is close on the base plate 10, be positioned at base plate away from a side of shell 20, and the opposite side of this PTC thermistor 50 is provided with the conducting metal shell fragment 60 of a stainless steel material, these metal clips 60 middle parts are bent into the rectangular channel 61 suitable with thermistor 50 profiles, part is surrounded and is close to described thermistor, formation is electrically connected with thermistor, and the two ends 62 outside shell sides of metal clips 60 tightly are buckled in described shell both sides to bending, realization like this is electrically connected with described shell, and with thermistor, base plate, insulating paper, shell tightly forces together, and forms compact structure; Be rectangle every the insulating paper 30 between base plate and shell, make with the polyester composite material, has certain rigidity, this insulating paper surrounds bottom parts to base plate 10 outer surface bendings, not besieged and be used for placing thermistor in the middle of the base plate, 31 perks of insulating paper two ends are clamped in described thermistor 50 between the two ends of perk, has certain fixation, as shown in Figure 4.
As shown in Figure 2, extend an electric connecting terminal 21 integratedly from described metal shell 20, extend another electric connecting terminal 11 integratedly from described base plate 10, do not contact between described two links, insulation each other, each electric connecting terminal 21,11 outer end are respectively equipped with wiring card 24,14.
The said structure of temperature current protector has formed circuit as shown in Figure 1 and has connected, and namely temperature-sensitive resistance 50 is in parallel with bimetal leaf 40.
Difference clamping one section lead 80 on the described wiring card 24,14; wherein a lead is stuck to constitute with second wiring card 70 of fire line terminal 2 usefulness conduction and is electrically connected; another lead then is stuck to constitute by another second wiring card 70 and the live wire 5 of power supply output line and is electrically connected, and so the temperature current protector is connected into the plug live wire.
Usually, bimetal leaf operating temperature of the present invention is from 65 ℃ to 160 ℃, and reset temperature is from 50 ℃ to 105 ℃; So selected thermistor and bimetal leaf reset temperature have relation, common selected thermistor gauge surface temperature is greater than 120 ℃.The thermistor gauge surface temperature must for example adopt the thermistor of LKP0EY00009025 model greater than the product reset temperature.The voltage of thermistor has 110VAC and 220VAC, according to the voltage decision of protective circuit.The room temperature resistance of thermistor is normally between 500～6000 Europe.
When because failure and other reasons, overheated or the overcurrent of circuit, after the bimetal leaf dynamic and static contact tripping, electric current passes through from temperature-sensitive resistance, thermistor generates heat immediately, thermistor makes the heat transferred bimetal leaf it can't lower the temperature and resets, because the thermistor resistance is big, electric current is very little in the loop, be not enough to drive load, electric equipment can not move, and has only when cutting off the electricity supply, make the thermistor outage and stop heating, bimetal leaf cools to and resets behind the wait certain hour, recloses power supply, and circuit has been started working again.When the circuit overcurrent, thermistor meeting heating up if make the bimetal leaf temperature surpass limit value and tripping on the one hand, can be realized protection, and on the other hand, thermistor intensification resistance increases much and reduces circuital current, also can realize overcurrent protection.
Claims (7)
1. the circuit structure with defencive function comprises power line (1), it is characterized in that, directly is in series with temperature current protector (100) on the described power line; Described temperature current protector (100) comprises a bimetal leaf (40) and is connected in parallel on a thermistor (50) at its two ends.
2. according to the described a kind of circuit structure with defencive function of claim, it is characterized in that, connect in the circuit of described temperature current protector (100) or the circuit branch rated current less than 9A or equal 9A.
3. a kind of circuit structure with defencive function according to claim 1 is characterized in that, described temperature current protector (100) is connected on the live wire of described power line.
4. a kind of circuit structure with defencive function according to claim 1, it is characterized in that, described temperature current protector (100) is provided with a metal base plate (10) and the described metal shell (20) with groove (22), the groove mouth of described base plate and described shell is relative and be buckled into a cavity with shell, insulate with insulating paper (30) between described base plate and the described shell, described cavity is built-in with described bimetal leaf (40), one end of described bimetal leaf is electrically connected with described metal shell (20), the other end is provided with moving contact (42), be fixed with a fixed contact (12) outstanding in the described cavity on the described base plate (10), described fixed contact (12) passes the insulating paper (30) of base plate one side and is corresponding with described moving contact (42), is electrically connected with fixed contact during described moving contact normality, when bimetal leaf (30) then leaves fixed contact when temperature is higher than set point and disconnects electrical connection; One side of described thermistor (50) is close to and is electrically connected on described base plate (10) away from a side of shell, the opposite side of described thermistor then is electrically connected with a metal clips (60), this metal clips (60) also is electrically connected with described shell (20), and thermistor and shell are compressed; Stretch out an electric connecting terminal (21,11) respectively from described metal shell (20) and described base plate (10), and insert on the described power line (1) with these two electric connecting terminals.
5. a kind of circuit structure with defencive function according to claim 4; it is characterized in that; described electric connecting terminal (21; 11) be a section lead; one end is welded on the wiring card (14) that described base plate (10) is gone up or described shell (20) is gone up or pass through on base plate or the shell and is electrically connected with base plate or shell, and the other end is connected with described power line (1).
6. a kind of circuit structure with defencive function according to claim 4, it is characterized in that, described thermistor (50) is cuboid, and described metal clips (60) middle part is bent into thermistor profile shape adapting, part and surrounds described thermistor, metal clips two ends (62) then outwards shell side to bending and be held in described shell both sides; Described every the insulating paper between base plate and shell to the side bending of base plate away from shell, two ends (31) perk, clamp the both sides of described thermistor (50).
7. a kind of circuit structure with defencive function according to claim 4 is characterized in that, the base plate of described temperature current protector (10) adopts the cold-reduced sheet of iron nickel zinc alloy; Described shell (20) adopts the deep-draw stretching cold-reduced sheet of iron nickel zinc alloy material; Described metal clips (60) adopts stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102562013A CN103346533A (en) | 2013-06-25 | 2013-06-25 | Circuit structure with protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102562013A CN103346533A (en) | 2013-06-25 | 2013-06-25 | Circuit structure with protection function |
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|---|---|
| CN103346533A true CN103346533A (en) | 2013-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102562013A Pending CN103346533A (en) | 2013-06-25 | 2013-06-25 | Circuit structure with protection function |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551904A (en) * | 2016-01-22 | 2016-05-04 | 江苏常胜电器股份有限公司 | Dual voltage current inlaid protector |
| CN106057596A (en) * | 2016-06-27 | 2016-10-26 | 攸县联诚电子有限公司 | Power failure reset protector integrating double temperature and current protections |
| CN106992103A (en) * | 2016-01-21 | 2017-07-28 | 瑞侃电子(上海)有限公司 | Thermal circuit beraker |
| CN107437790A (en) * | 2016-05-26 | 2017-12-05 | 郑浩生 | Family expenses overcurrent protection socket |
| CN112437576A (en) * | 2020-11-24 | 2021-03-02 | 张昌林 | Inverter heat dissipation device for photovoltaic power generation |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
| CN117728369A (en) * | 2024-02-18 | 2024-03-19 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
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| CN101197480A (en) * | 2007-12-14 | 2008-06-11 | 深大宇电器(深圳)有限公司 | Plug |
| CN201126958Y (en) * | 2007-12-07 | 2008-10-01 | 深大宇电器(深圳)有限公司 | Motor temperature, current protective circuit, protector as well as stirring machine with protector |
| US20100149714A1 (en) * | 2008-12-12 | 2010-06-17 | Tsung-Mou Yu | Dual Protection Device For Circuit |
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2013
- 2013-06-25 CN CN2013102562013A patent/CN103346533A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201126958Y (en) * | 2007-12-07 | 2008-10-01 | 深大宇电器(深圳)有限公司 | Motor temperature, current protective circuit, protector as well as stirring machine with protector |
| CN101197480A (en) * | 2007-12-14 | 2008-06-11 | 深大宇电器(深圳)有限公司 | Plug |
| US20100149714A1 (en) * | 2008-12-12 | 2010-06-17 | Tsung-Mou Yu | Dual Protection Device For Circuit |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992103A (en) * | 2016-01-21 | 2017-07-28 | 瑞侃电子(上海)有限公司 | Thermal circuit beraker |
| CN105551904A (en) * | 2016-01-22 | 2016-05-04 | 江苏常胜电器股份有限公司 | Dual voltage current inlaid protector |
| CN107437790A (en) * | 2016-05-26 | 2017-12-05 | 郑浩生 | Family expenses overcurrent protection socket |
| CN106057596A (en) * | 2016-06-27 | 2016-10-26 | 攸县联诚电子有限公司 | Power failure reset protector integrating double temperature and current protections |
| CN112437576A (en) * | 2020-11-24 | 2021-03-02 | 张昌林 | Inverter heat dissipation device for photovoltaic power generation |
| CN112437576B (en) * | 2020-11-24 | 2022-01-07 | 汪清县振发投资有限公司 | Inverter heat dissipation device for photovoltaic power generation |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
| CN117728369A (en) * | 2024-02-18 | 2024-03-19 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
| CN117728369B (en) * | 2024-02-18 | 2024-05-10 | 国网安徽省电力有限公司电力科学研究院 | Electromagnetic voltage transformer overvoltage suppression assembly based on PTC |
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Application publication date: 20131009 |