CN202395414U - A circuit protection device and an electronic circuit comprising the same - Google Patents
A circuit protection device and an electronic circuit comprising the same Download PDFInfo
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- CN202395414U CN202395414U CN2011203574029U CN201120357402U CN202395414U CN 202395414 U CN202395414 U CN 202395414U CN 2011203574029 U CN2011203574029 U CN 2011203574029U CN 201120357402 U CN201120357402 U CN 201120357402U CN 202395414 U CN202395414 U CN 202395414U
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- thermistor
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- heater element
- circuit brake
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Abstract
The utility model brings forward a circuit protection device (P) and an electronic circuit comprising the same. The circuit protection device comprises a first thermistor (1) with the characteristic of a positive temperature coefficient, and a heater (2) that is coupled with the first thermistor (1) in a heat conduction manner and is used for heating the first thermistor (1) in a controlled manner. The circuit protection device and the electronic circuit comprising the same allow controlled protection to be realized, enables the motion time to be shortened, is suitable for faults of over-current, over-temperature or the like, is also suitable for faults caused by non-over-current and non-over-temperature situations, allows the work current and the fault current to be similar, and is suitable for occasions that need the fast operating time of protection and enable protection to be actively triggered depending on a control circuit, such as a power batter, a USB and a power circuit.
Description
Technical field
The utility model relates to technical field of electronic devices, and more specifically, the utility model relates to a kind of circuit brake.
Background technology
In circuit, electronic component or electric equipment all have specified operating voltage and operating current usually.Yet because a variety of causes, for example power-supply fluctuation, short circuit etc., these electronic components or electronic equipment are operated in inadequately sometimes under the overload and break down.Break down and cause damaging for fear of electronic component or electronic equipment, can use circuit brake to come voltage and electric current in the restricting circuits.
Positive temperature coefficient (Positive Temperature Coefficient is called for short PTC) thermo-sensitive material is a kind of circuit brake commonly used.Its characteristic is that because the power that curtage produces on ptc material, ptc material can little by little accumulate heat, and its temperature is raise.Locate when its temperature is elevated to Curie point (or claiming transition temperature point), the resistance of ptc material can become the increase of geometric progression.When the temperature reduction, the resistance of ptc material can reduce the position of getting back near initial resistance again.Therefore, ptc material needing can be widely used in the overcurrent of self recovery, the protection occasion of excess temperature, for example; PTC resistance is connected with the circuit part that needs protection, when this circuit part that needs protection of flowing through, promptly flow through the electric current of PTC resistance excessive after; PTC resistance can generate heat and be warming up to Curie point, causes that its resistance significantly promotes, thereby improves the resistance in the loop widely; Then reduce to flow through the electric current of the circuit part that needs protection, play a protective role.
There is certain shortcoming in the existing resist technology of more than describing, and when overcurrent, ptc material must rely on certain heat accumulation time just can reach Curie point, and resistance raises to begin the protection action then.This time is compared with the semiconductor protection circuit, and is slower usually, and the protection effect is limited.Moreover, because ptc material is the passive protection device, lack controllably defencive function; For example can't accept the instruction of control circuit, therefore, under the specific fault condition; As under non-overcurrent and the non-overheated condition during system failure, ptc material can't effectively be protected.And big electric current, fast motion, small size and can intelligent control be that the current main direction of ptc material technology develops.
The utility model content
In order to solve above-mentioned at least one problem, the inventive concept of the utility model is, for ptc material provides a thermal source that can controllably heat this ptc material.In normal operation, this thermal source does not operate; And when the external world detected fault and takes place, when for example overvoltage, excess temperature, under-voltage or the like fault, this thermal source controllably heated this ptc material.Like this, can accelerate ptc material and be warming up to its Curie point, and then make ptc material begin protection work quickly.Thereby, can realize controllably protecting, and be provided shorter operate time.
An aspect according to the utility model provides a kind of circuit brake, it is characterized in that, comprising:
One is used for first thermistor circuit protection, that have ptc characteristics; And
A heater element couples with said first thermistor with heat conduction, is used for controllably heating this first thermistor.
According to this aspect, realized protection controllably, and be provided shorter operate time.Both be applicable to faults such as overcurrent and excess temperature, and be applicable to that also fault was caused by non-overcurrent and non-excess temperature situation, it is comparatively approaching with fault current perhaps to work, but the operate time of protection requirement is very fast, needs to rely on the initiatively occasion of trigger protection of control circuit.More concrete application scenario includes but not limited to power-type battery, USB and power circuit etc.
According to an execution mode more specifically, said circuit brake further comprises input, output and control end,
Wherein, said first thermistor has first electrode and second electrode, and said first electrode links to each other with said input, and said second electrode links to each other with said output;
Said heater element has third electrode and the 4th electrode, and said third electrode links to each other with said output, and said the 4th electrode links to each other with said control end and can be made as by said control end and forms loop or unsettled, comes controllably to heat first thermistor.
This more specifically execution mode circuit brake structure a kind of three ends, compact is provided.
According to another execution mode more specifically, said heater element comprise following at least each:
-have second thermistor of ptc characteristics;
-resistive heater element;
-perceptual heater element;
-semiconductor heat booster spare.
This more specifically execution mode the multiple implementation of heater element is provided.
Preferably, said heater element comprises said second thermistor, and the transition temperature point of said second thermistor is equal to or higher than the transition temperature point of said first thermistor.According to this preferred embodiment, can before the running of first thermistor, heat this first thermistor constantly, have more excellent heats, therefore have more excellent protection effect.
Preferably, said heater element comprises said second thermistor, and under same current and environment, the operate time of said second thermistor is faster than the operate time of said first thermistor.According to this preferred embodiment, first thermistor can begin the protection action quickly, has more excellent protection effect.
According to another execution mode more specifically; Said first thermistor and said heater element are in the form of sheets; And said first and second electrode lays respectively at the both sides of said first thermistor; The the said the 3rd and the 4th electrode is respectively for the both sides of said heater element, and said first thermistor and said heater element be by be electrically connected ground connection and fitting with heat conduction of said second electrode and said third electrode, and this circuit brake also comprises
As first pin of said input, be connected with said first electrode electricity;
As second pin of said output, be electrically connected with said third electrode with said second electrode;
As the 3rd pin of said control end, be connected with said the 4th electrode electricity.
This execution mode provide this circuit brake, the pin-type implementation.
According to another execution mode more specifically; Said first thermistor and heater element are in the form of sheets; And said first and second electrode lays respectively at the both sides of said first thermistor; The the said the 3rd and the 4th electrode lays respectively at the both sides of said heater element, and first thermistor and heater element are coupled by following arbitrary mode with heat conduction:
-engage through fixed frame;
-fit through Heat Conduction Material;
This circuit brake also comprises:
As first pad of said input, be connected with said first electrode electricity;
As second pad of said output, be electrically connected with said third electrode with said second electrode;
As the 3rd pad of said control end, be connected with said the 4th electrode electricity.
This execution mode provide this circuit brake, paster pad type implementation.
According to another execution mode, this circuit brake also comprises, the insulating heat-conductive layer between said first thermistor and said heater element.
Second aspect according to the utility model provides a kind of electronic circuit, comprises the circuit part that needs protection, and it is characterized in that, also comprises:
-one according to the described circuit brake in aforementioned first aspect, and wherein, first thermistor of this circuit brake links to each other with said circuit part;
-one control circuit links to each other with said circuit part, to detect whether the protection incident takes place in the said circuit part; And, link to each other with the heater element of said circuit brake, heat said first thermistor when said protection incident takes place, to control said heater element.
This aspect provides the electronic circuit that comprises this circuit brake, the protection that it can access controllably, operate time is shorter.
The 3rd aspect according to the utility model provides a kind of circuit protection method, it is characterized in that, comprises the steps:
-in circuit, provide one to be used to protect first thermistor this circuit, that have ptc characteristics;
-heater element is provided, couple with heat conduction with said first thermistor;
-when needs are protected this circuit, control said heater element and heat said first thermistor.
According to this aspect, realized protection controllably, and be provided shorter operate time.
The above characteristic of the utility model and other characteristics are partly set forth embodiment hereinafter clearly.
Description of drawings
Through with reference to the detailed description of being done below the advantages, can more easily understand characteristic, purpose and the advantage of the utility model to non-limiting example.
Fig. 1 shows the circuit diagram according to the circuit brake of an embodiment of the utility model;
Fig. 2 shows the circuit brake of realizing with pin mode according to the embodiment of the utility model;
Fig. 3 shows the decomposing schematic representation of realizing with paster pad mode according to a kind of circuit brake of the embodiment of the utility model;
The circuit brake of paster pad mode after accomplishing, shown in Figure 3 that Fig. 4 shows assembling;
Fig. 5 shows the decomposing schematic representation of realizing with paster pad mode according to another circuit brake of the embodiment of the utility model;
Fig. 6 shows assembling circuit brake after accomplishing, shown in Figure 5;
Fig. 7 shows the vertical view of realizing with paster pad mode according to the another kind of circuit brake of the embodiment of the utility model;
Fig. 8 shows the upward view of circuit brake shown in Figure 7;
Fig. 9 shows the electronic circuit that comprises according to the circuit brake of the embodiment of the utility model.
Wherein, same or analogous Reference numeral is represented same or analogous device.
Embodiment
Go through enforcement and the use of embodiment below.Yet, should be appreciated that the specific embodiment discussed only exemplarily explanation implement and use the ad hoc fashion of the utility model, and the scope of unrestricted the utility model.
The utility model provides a kind of circuit brake, comprising:
A heater element 2 couples with said first thermistor with heat conduction, is used for controllably heating this first thermistor.
According to an execution mode more specifically, as shown in Figure 1, circuit brake P comprises input IN, output OUT and control end Ctrl.First thermistor 1 has the first electrode t1 and the second electrode t2, and the first electrode t1 links to each other with input IN, and the second electrode t2 links to each other with output OUT; And heater element 2 has third electrode t3 and the 4th electrode t4, and third electrode t3 links to each other with output OUT, and the 4th electrode t4 links to each other with control end Ctrl.And, the connected mode that reference example is as shown in Figure 6, the 4th electrode t4 can be made as formation loop or unsettled by controlled terminal Ctrl, and heater element 2 is controllably operated to heat first thermistor 1.Arrow T among the figure represents the heat transfer process of 2 pairs first thermistors 1 of heater element.
In one embodiment, heater element 2 is second thermistors 2 with ptc characteristics.
One preferred embodiment in; The transition temperature point of second thermistor 2 is equal to or higher than the transition temperature point of first thermistor 2; Like this, can before 1 running of first thermistor, heat this first thermistor 1 constantly; Have more excellent heats, therefore have more excellent protection effect.Special, when this circuit brake is applied in non-overcurrent and non-excess temperature situation following time, depending merely on electric current and the temperature that first thermistor 1 oneself bears can't come into operation.At this moment, rely on this preferred embodiment, second thermistor 2 is heated to its Curie temperature with first thermistor 1, makes thermistor 1 running of winning, and this just seems and is particularly useful.
Another preferred embodiment in; Under same current and environment, the operate time of second thermistor 2 is faster than the operate time of first thermistor 1, like this; First thermistor 1 begins to protect the time of action to shorten further, therefore has more excellent protection effect.
Fig. 2 shows this circuit brake P that realizes with pin mode.As shown in the figure; First thermistor 1 and second thermistor 2 are in the form of sheets; And the first electrode t1 and the second electrode t2 lay respectively at first thermistor 1 in paper and towards the paper outside, third electrode t3 and the 4th electrode t4 lay respectively at second thermistor in paper and towards the paper outside, and first thermistor 1 and second thermistor are by the second electrode t2 and third electrode t3 be electrically connected ground connection and applying with heat conduction; This circuit brake P also comprises the first pin PIN1 as input; Be electrically connected with the first electrode t1, as the second pin PIN2 of output, with the second electrode t2 be electrically connected with third electrode t3; And, be electrically connected with the 4th electrode t4 as the 3rd pin PIN3 of control end.Be appreciated that this circuit brake P can also comprise the insulation-encapsulated of outside, do not illustrate for the structure of display circuit protection device P here.
Fig. 3 shows a kind of circuit brake P that realizes with the pad mode.As shown in the figure, first thermistor 1 and second thermistor 2 in the form of sheets, and the first electrode t1 and the second electrode t2 lay respectively at the upside and the downside of first thermistor 1, third electrode t3 and the 4th electrode t4 lay respectively at second thermistor, 2 downsides and upside.Fixed frame 3 engages first thermistor 1 through being used for the anti-cushion of pressing 5, and hollow outs in the middle of fixed frame 3 and the cushion 5, just in time holds second thermistor 2, allows the third electrode t3 of second thermistor 2 to engage the second electrode t2 of first thermistor 1.This circuit brake P also comprises protective finish 4, is positioned at second thermistor, 2 upper stratas.Comprise three pads on this protective finish 4; Wherein, First pad as input IN is electrically connected with the first electrode t1 through through hole; Be electrically connected with the second electrode t2 and third electrode t3 through through hole as second pad of output OUT, pass through through hole as the 3rd pad c of control end Ctrl and be electrically connected with the 4th electrode t4.The circuit brake of paster pad mode after accomplishing, shown in Figure 3 that Fig. 4 shows assembling.
Fig. 5 has provided a kind of execution mode of variation.As shown in the figure, first thermistor 1 and second thermistor 2 in the form of sheets, and the first electrode t1 and the second electrode t2 lay respectively at the upside and the downside of first thermistor 1, third electrode t3 and the 4th electrode t4 lay respectively at second thermistor, 2 downsides and upside.Insulating barrier 4 is positioned at the lower floor of first thermistor 1, between first and second thermistors, and the upper strata of second thermistor 2.Comprise three on the insulating barrier 4 on second thermistor, 2 upper stratas respectively as the pad of input, control end and output, they link to each other with the counter electrode of first and second thermistors respectively through through hole.Fig. 6 is the view after circuit brake assembling shown in Figure 5 is accomplished.
Fig. 7 and Fig. 8 show the another kind of circuit brake P that realizes with the pad mode, and wherein, Fig. 7 is a vertical view, and Fig. 8 is a upward view.As shown in the figure, first thermistor 1 and second thermistor 2 in the form of sheets, and the first electrode t1 and the second electrode t2 lay respectively at the upside and the downside of first thermistor 1, third electrode t3 and the 4th electrode t4 lay respectively at second thermistor, 2 upsides and downside.Have insulating heat-conductive layer 3 between first thermistor 1 and second thermistor 2, they are fit together by materials such as heat-conducting glues.The coating 4 of two insulation is fitted in the top of first thermistor 1 and the below of second thermistor 2 respectively.Be formed with or be combined with pad on the 4th electrode t4 of second thermistor, and the correspondence position of the coating 4 of below had opening 5 by hollow out, manifest this pad with below fitting in second thermistor 2 time as control end Ctrl.Pad as input IN is positioned at the right side, and it links to each other with the first electrode t1 through through hole, is positioned at the left side as the pad of output Ctrl, and it passes through through hole and links to each other with third electrode t3 with the second electrode t2.
Be appreciated that pad the position be not limited to the above execution mode of lifting, these pads can be positioned at any position on the circuit brake of patch-type, and are connected with required electrode electricity through the through hole that rationally is provided with.
After the structure of having described this circuit brake and function, the electronic circuit that will adopt an example below details the operation principles of this circuit brake.
As shown in Figure 9; Electronic circuit comprises the circuit part that needs protection; Load circuit L for example, and comprise this circuit brake P, wherein; Circuit brake P connects with load circuit through input IN and output OUT, and control end Ctrl is second thermistor, 2 formation loops through a gate-controlled switch K.The control of the controlled circuit C of this gate-controlled switch K and opening or closing.This control circuit C also links to each other with load circuit L, to detect among the load circuit L whether the protection incident takes place.
In normal operation, control circuit does not detect the protection incident, and then its control gate-controlled switch K breaks off; Be about to break off for the loop of second thermistor 2; Second thermistor is not worked, and first thermistor do not work, and promptly circuit brake P does not protect.In the protection incident, when arbitrary situation takes place below for example:
-overcurrent;
-overvoltage;
-under voltage;
-excess temperature.
Control circuit can compare through electric current, voltage, temperature and predetermined current, voltage, the temperature value that load circuit is stood, and detects this protection incident and takes place.Then, K is closed for this control circuit C control gate-controlled switch, promptly for second thermistor, 2 formation loops, causes 2 actions of second thermistor, thereby heats first temperature-sensitive, 1 resistance, impels it to move quickly, the protection load circuit.
Through this kind circuit arrangement, the electric current that can avoid flowing into control switch K after the action of first thermistor 1 is excessive, thereby can select lower-powered control switch K, reduces cost.
Under non-electric current and non-temperature fault condition, through control circuit control, circuit brake still can be protected action.The applicant tested the operate time of single PTC protection device and this circuit brake, and following table has provided test result.Wherein, input voltage is 16V, and the holding current of single PTC protection device is 7A, and the electric current during fault is merely 5A.Test 5 single PTC protection devices and this circuit brake respectively, respectively with shown in the sequence number 1-5.
Table 1
Can find out that from test result the electric current during owing to fault is lower than holding current, so single PTC protection device is failure to actuate.And the operate time of this circuit brake is all less than 2 seconds.
Although in accompanying drawing and aforesaid description sets forth in detail with the utility model has been described, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The utility model is not limited to above-mentioned execution mode.For example; This heater element 2 shown in Figure 1 and the circuit connecting mode between first thermistor 1 do not limit the utility model; For example the third electrode t3 of heater element 2 also can link to each other with the first electrode t1 of first thermistor 1, if both entities between with heat conduction.Again for example, heater element can also be by resistive heater element, and perceptual heater element and semiconductor heat booster spare constitute, and these heater elements and suitable connected mode thereof are that one of ordinary skill in the art is known, and repeat no more at this.
The those skilled in the art in those present technique fields can be through research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In claim, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the practical application of utility model, the function of a plurality of technical characterictics of being quoted during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.
Claims (10)
1. a circuit brake is characterized in that, comprising:
One is used for first thermistor circuit protection, that have ptc characteristics (1); And
A heater element (2) couples (T) with heat conduction with said first thermistor (1), is used for controllably heating this first thermistor (1).
2. circuit brake according to claim 1 is characterized in that, said circuit brake further comprises input (IN), output (OUT) and control end (Ctr1),
Wherein, said first thermistor has first electrode (t1) and second electrode (t2), and said first electrode links to each other with said input, and said second electrode links to each other with said output;
Said heater element has third electrode (t3) and the 4th electrode (t4); Said third electrode links to each other with said output; Said the 4th electrode links to each other with said control end and can be made as by said control end and forms loop or unsettled, comes controllably to heat first thermistor.
3. circuit brake according to claim 1 is characterized in that, said heater element comprise following at least each:
-have second thermistor of ptc characteristics;
-resistive heater element;
-perceptual heater element; Or
-semiconductor heat booster spare.
4. circuit brake according to claim 3 is characterized in that, said heater element comprises said second thermistor, and the transition temperature point of said second thermistor is equal to or higher than the transition temperature point of said first thermistor.
5. according to claim 3 or 4 described circuit brakes, it is characterized in that said heater element comprises said second thermistor, under same current and environment, the operate time of said second thermistor is faster than the operate time of said first thermistor.
6. circuit brake according to claim 2; It is characterized in that; Said first thermistor and said heater element in the form of sheets, and said first and second electrode lays respectively at the both sides of said first thermistor, the said the 3rd and the 4th electrode is respectively for the both sides of said heater element; And said first thermistor and said heater element are by be electrically connected ground connection and fitting with heat conduction of said second electrode and said third electrode, and this circuit brake also comprises
As first pin (PIN1) of said input, be connected with said first electrode electricity;
As second pin (PIN2) of said output, be electrically connected with said third electrode with said second electrode;
As the 3rd pin (PIN3) of said control end, be connected with said the 4th electrode electricity.
7. circuit brake according to claim 2; It is characterized in that; Said first thermistor and heater element are in the form of sheets; And said first and second electrode lays respectively at the both sides of said first thermistor, and the said the 3rd and the 4th electrode lays respectively at the both sides of said heater element, and first thermistor and heater element are coupled by following arbitrary mode with heat conduction:
-engage through fixed frame;
-fit through Heat Conduction Material;
This circuit brake also comprises:
As first pad of said input, be connected with said first electrode electricity;
As second pad of said output, be electrically connected with said third electrode with said second electrode;
As the 3rd pad of said control end, be connected with said the 4th electrode electricity.
8. circuit brake according to claim 2 is characterized in that, also comprises the insulating heat-conductive layer between said first thermistor and said heater element.
9. an electronic circuit comprises the circuit part (L) that needs protection, and it is characterized in that, also comprises:
-one according to each described circuit brake in the claim 1 to 7, and wherein, first thermistor (1) of this circuit brake links to each other with said circuit part (L);
-one control circuit (C), (L) links to each other with said circuit part, to detect in the said circuit part (L) whether the protection incident takes place; And, link to each other with the heater element (2) of said circuit brake, when said protection incident takes place, to control said heater element (2) heating said first thermistor (1).
10. according to the said electronic circuit of claim 9, it is characterized in that, said protection incident comprise following at least each:
-overcurrent;
-overvoltage;
-under voltage;
-excess temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203574029U CN202395414U (en) | 2011-09-22 | 2011-09-22 | A circuit protection device and an electronic circuit comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203574029U CN202395414U (en) | 2011-09-22 | 2011-09-22 | A circuit protection device and an electronic circuit comprising the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202395414U true CN202395414U (en) | 2012-08-22 |
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ID=46670316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203574029U Withdrawn - After Issue CN202395414U (en) | 2011-09-22 | 2011-09-22 | A circuit protection device and an electronic circuit comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202395414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022961A (en) * | 2011-09-22 | 2013-04-03 | 瑞侃电子(上海)有限公司 | Circuit protection device, electronic circuit containing device, and circuit protection method |
| CN105190270A (en) * | 2013-03-14 | 2015-12-23 | Zf腓德烈斯哈芬股份公司 | Arrangement for testing a device for protecting an electronic component against overheating and pertaining method |
-
2011
- 2011-09-22 CN CN2011203574029U patent/CN202395414U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022961A (en) * | 2011-09-22 | 2013-04-03 | 瑞侃电子(上海)有限公司 | Circuit protection device, electronic circuit containing device, and circuit protection method |
| CN105190270A (en) * | 2013-03-14 | 2015-12-23 | Zf腓德烈斯哈芬股份公司 | Arrangement for testing a device for protecting an electronic component against overheating and pertaining method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120822 Effective date of abandoning: 20160427 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |