CN1298089C - Circuit protector and method for over current and over heat protection thereof - Google Patents
Circuit protector and method for over current and over heat protection thereof Download PDFInfo
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- CN1298089C CN1298089C CNB021460817A CN02146081A CN1298089C CN 1298089 C CN1298089 C CN 1298089C CN B021460817 A CNB021460817 A CN B021460817A CN 02146081 A CN02146081 A CN 02146081A CN 1298089 C CN1298089 C CN 1298089C
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Abstract
The present invention provides a circuit protecting device and an overcurrent and overtemperature protecting method thereof, which is used for carrying out overcurrent protection and overtemperature protection to a main circuit. The circuit protecting device is provided with a current limiting circuit and an overtemperature protection circuit, wherein the current limiting circuit is used for detecting the current of the main circuit to enable the output current of the main circuit to be limited within a preset value, and the overtemperature protection circuit is used for carrying out the overtemperature protection to the main circuit; in addition, the overtemperature protection operation of the overtemperature protection circuit is controlled by the current limiting circuit. The present invention can avoid the condition that a false operation occurs due to the deflection of the preset temperature caused by the deviation of a control program of the overtemperature protection circuit.
Description
Technical field
The present invention relates to the resist technology field of circuit, be meant a kind of circuit protection device and overcurrent and method for excessive heating protection that prevents to cause the misoperation generation especially because of the process deviation of protective circuit.
Background technology
In general Circuits System, in order to provide power supply to an internal electric source supply system of other peripheral circuits when the running, usually to face system overheat or the excessive problem of output current.Therefore as shown in Figure 1, known a kind of circuit protection device 1 promptly is used to protect this power system 2 the reason electric current is excessive or temperature is too high and damage.This circuit protection device 1 comprises that one is limited in current-limiting circuit 11 in the preset value in order to detecting and with the output current of this power system 2, and the temperature of this power system 2 of detecting is to carry out the overheating protection circuit 12 of overtemperature protection in good time.And generally this overheating protection circuit 12 is set in its overtemperature protection temperature between 150 ℃～170 ℃ usually, that is when the temperature of this power system 2 surpassed 150 ℃～170 ℃, this overheating protection circuit 12 just can carry out overtemperature protection and make it close it.But, because general overheating protection circuit 12 is in manufacture process, can be because its element self character skew causes process deviation, make its temperature set and produce skew, and for example, be reduced to 130 ℃ or be elevated to 190 ℃ from 150 ℃ (correct temperature set), thereby cause this overheating protection circuit 12 when the temperature of this power system 2 reaches design temperature (150 ℃) as yet, not close this power system 2 in advance, and reduce the service efficiency of this power system 2; Or when the temperature of this power system 2 had surpassed design temperature (150 ℃), this overheating protection circuit 12 was not but in time closed this power system, causes this power system 2 because of overheated situation about damaging.And present known opening in the technology of overheating protection circuit; all be that focus is placed in the improvement of the circuit of overheating protection circuit own; they can only improve the usefulness of overheating protection circuit usually, but still can not avoid the influence that process deviation caused of overheating protection circuit.
Summary of the invention
Therefore, purpose of the present invention is promptly providing a kind of circuit protection device and overcurrent and the method for excessive heating protection that can avoid causing because of the process deviation of overheating protection circuit the misoperation generation.
For reaching above-mentioned purpose, the present invention proposes a kind of circuit protection device, and in order to a main circuit is carried out overcurrent and overtemperature protection, it comprises: a current-limiting circuit, it is connected with above-mentioned main circuit, this main circuit is carried out current sense also the output current of this main circuit is limited in the preset value; And an overheating protection circuit, it is connected with above-mentioned current-limiting circuit and main circuit, and is subjected to the control of above-mentioned current-limiting circuit and this main circuit is carried out overtemperature protection.
In addition, the present invention also proposes a kind of overcurrent and method for excessive heating protection of circuit protection device, wherein the control of the overtemperature protection of overheating protection circuit action restricted flow circuit.
In above-mentioned method: when circuit protection device is activated; current-limiting circuit can be moved in advance and main circuit is carried out current sense; when reaching a limits value as if the output current that detects main circuit; the output current that is about to main circuit is limited in the preset value, and starts overheating protection circuit simultaneously.
In above-mentioned method: when circuit protection device is activated; current-limiting circuit and overheating protection circuit move simultaneously; and respectively main circuit is carried out electric current and temperature detecting; when the output current that detects main circuit when current-limiting circuit reaches a limits value; be about to this output current and be limited in the preset value, and the preset temperature of overheating protection circuit is controlled.
The present invention can avoid causing the design temperature skew that the situation of misoperation takes place because of the process deviation of overheating protection circuit.
Description of drawings
Other features and advantages of the present invention in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly be understood, in graphic:
Fig. 1 is the calcspar and the user mode schematic diagram thereof of known a kind of circuit protection device;
Fig. 2 is the calcspar and the user mode schematic diagram thereof of first preferred embodiment of circuit protection device of the present invention; And
Fig. 3 is calcspar and another user mode schematic diagram thereof of second preferred embodiment of circuit protection device of the present invention.
Embodiment
Consult shown in Figure 2; it is first preferred embodiment of circuit protection device of the present invention; this circuit protection device 3 is in order to carry out overcurrent and overtemperature protection to a main circuit 4; and this main circuit 4 is one to provide the internal electric source supply system of power supply to peripheral circuit 41 in the present embodiment; this circuit protection device 3 comprises respectively a current-limiting circuit 31 and an overheating protection circuit 32 that electrically connects with this main circuit 4, and this main circuit 4, current-limiting circuit 31 and overheating protection circuit 32 all are by an external circuit 5 power supplies.And can be because process deviation producing component characteristic deviation based on this overheating protection circuit 32; and the problem that causes design temperature to be offset; and when overcurrent takes place in main circuit 4; the situation that its temperature does not reach usually overheated (being that temperature is too high); so; as shown in Figure 2, the present invention promptly controls the action of this overheating protection circuit 32 with this current-limiting circuit 31.That is; when this circuit protection device 3 is activated; this current-limiting circuit 31 can be activated earlier so that this main circuit 4 is carried out overcurrent detecting; at this moment; this overheating protection circuit 32 also is failure to actuate; when the output current that detects this main circuit 4 up to this current-limiting circuit 31 reaches a limits value (being overcurrent), be about to this output current and be limited in the preset value, and start this overheating protection circuit 32 simultaneously.Make this main circuit 4 is carried out temperature detecting and overtemperature protection action.For this reason; suppose that this overheating protection circuit 32 makes its design temperature reduce to 120 ℃ (incorrect set points) by 150 ℃ (correct set points) because of process deviation; and the limits value of this current-limiting circuit 31 is 1.6 amperes; when then the temperature that arrives 1 ampere-hour when the output current of this main circuit 4 is 120 ℃; because the output current of main circuit 4 does not reach the limits value (1.6 amperes) of current-limiting circuit 31; so this current-limiting circuit 31 can not carried out overcurrent limiting and can not started this overheating protection circuit 32; therefore, also can not reach the design temperature of its deviation because of the temperature of main circuit 4 but do not close this main circuit 4 yet under the situation of overcurrent even the design temperature of this overheating protection circuit 32 is reduced to 120 ℃.On the other hand; when the output current that detects main circuit 4 when current-limiting circuit 31 reaches limits value (1.6 amperes) and temperature at that time and is 150 ℃; except its output current is limited in the preset value; for example 1.5 amperes; and start this overheating protection circuit 32 simultaneously; make this overheating protection circuit 32 under the situation of overcurrent, just carry out overtemperature protection at least and close this main circuit 4 (because temperature 150 ℃ greater than 120 ℃ of its design temperatures) at that time this main circuit 4; thereby avoid main circuit 4 not reason overheating protection circuit 32 process deviation and closed and the unlikely task performance that influences main circuit 4 in advance.Therefore the circuit protection device 3 of first embodiment mainly is in order to avoiding this overheating protection circuit 32 because process deviation causes design temperature low excessively, causes circuit erroneous action and the situation of closing main circuit 4 in advance takes place.
Then with reference to shown in Figure 3; it is second preferred embodiment of circuit protection device of the present invention; and as above-mentioned first embodiment; this circuit protection device 6 also comprises that a current-limiting circuit 61 and an overheating protection circuit 62 are to carry out overcurrent and overtemperature protection to a main circuit 7 respectively; and its different with first embodiment be that it mainly is to cause the too high situation of design temperature at this overheating protection circuit 62 because of process deviation.Therefore; in when, based on main circuit 7 overcurrent taking place; the situation that its temperature does not reach usually overheated (being that temperature is too high); in the present embodiment; this current-limiting circuit 61 and overheating protection circuit 62 be except carrying out electric current and the temperature detecting this main circuit 7 simultaneously, the overtemperature protection of this overheating protection circuit 62 action and be subjected to the control of this current-limiting circuit 61.That is; these overheating protection circuit 62 internal preset have one high and one low two kinds of temperature; when this circuit protection device 6 is activated; this current-limiting circuit 61 and overheating protection circuit 62 can start simultaneously and this main circuit 7 is carried out electric current and temperature detecting; this moment, the preset temperature of this overheating protection circuit 62 was provided in a side of " high-temperature "; therefore; when the output current that detects main circuit 7 when this current-limiting circuit 61 surpasses its limits value; except the output current with main circuit 7 is limited in a preset value; and control this overheating protection circuit 62 simultaneously its preset temperature is downgraded " low temperature " by " high-temperature " of original setting; make that by this overheating protection circuit 62 is unlikely under the situation of setting " high-temperature "; because of processing procedure skew make should " high-temperature " temperature drift, the situation that causes main circuit 7 but in time not closed yet under the situation of Da Gaowen (promptly overheated) takes place.For instance; suppose that this overheating protection circuit 62 makes its design temperature up be offset 30 ℃ because of process deviation; that is " high-temperature " is higher to 180 ℃ (incorrect preset temperatures) by original 150 ℃ (correct preset temperatures); and " low temperature " is offset to 150 ℃ by 120 ℃; then the output current when these current-limiting circuit 61 these main circuits 7 of detecting arrives limits value; for example 1.6 amperes; and temperature at that time is for for example 140 ℃ the time; promptly this electric current can be limited in the preset value; for example in 1.5 amperes; and control this overheating protection circuit 62 simultaneously preset temperature is reduced; that is switch to " low temperature " (150 ℃) by original " high-temperature " (180 ℃); and make its preset temperature become 150 ℃; so; in the time of can making the temperature of main circuit 7 continue to be increased to reach 150 ℃ of temperature that overheating protection circuit 62 sets; promptly be subjected to the overtemperature protection of this overheating protection circuit 62 and in time close, thereby can avoid process deviation because of overheating protection circuit 62 to cause main circuit 7 at high temperature not to be subjected to the situation that overtemperature protection burns yet really taking place.Therefore the circuit protection device 6 of second embodiment mainly is in order to avoid this overheating protection circuit 62 design temperature is higher to be caused circuit erroneous action and delay the situation of closing main circuit 7 and take place because process deviation causes.
Certainly; above-mentioned circuit protection device 3; 6 except respective action separately; also can be used simultaneously in this protected circuit; conclude above-mentioned; circuit protection device 3 of the present invention; 6 mainly is to utilize its current-limiting circuit 31; 61 control this overheating protection circuit 32; 62 start; and pass through in current-limiting circuit 31; 61 pairs of main circuits 4; 7 carry out electric current restriction time; control this overheating protection circuit 32; 62 carry out overtemperature protection under more suitable temperature; make not the reason process deviation and produce misoperation; thereby can avoid overheating protection circuit 32 really; 62 cause in advance or delay and close circuit 4 because of design temperature skew; 7 situation takes place, and promotes the task performance of main circuit 4 and further prevent overheated the burning of misoperation that main circuit 7 is caused because of thermal protection circuit 62 process deviation.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those who are familiar with this art, without departing from the spirit and scope of the invention; when can doing a little change and retouching, so the present invention's protection range is as the criterion when looking claims scope person of defining.
Claims (6)
1. circuit protection device, in order to a main circuit is carried out overcurrent and overtemperature protection, it is characterized in that: it comprises:
One current-limiting circuit, it is connected with above-mentioned main circuit, this main circuit is carried out current sense also the output current of this main circuit is limited in the preset value; And
One overheating protection circuit, it is connected with above-mentioned current-limiting circuit and main circuit, and is subjected to the control of above-mentioned current-limiting circuit and this main circuit is carried out overtemperature protection;
Wherein, when this circuit protection device is activated; this current-limiting circuit and overheating protection circuit are to move simultaneously; and respectively this main circuit is carried out electric current and temperature detecting; but when the output current that detects this main circuit when this current-limiting circuit reaches a limits value; be about to this output current and be limited in this preset value, and the preset temperature of this overheating protection circuit is controlled.
2. circuit protection device as claimed in claim 1; it is characterized in that: this overheating protection circuit internal preset has one high and one low two kinds of temperature; when this overheating protection circuit is not subjected to this current-limiting circuit control; the preset temperature of this overheating protection circuit is provided in a side of this " high-temperature "; and when this overheating protection circuit was subjected to the control of this current-limiting circuit, this overheating protection circuit then downgraded this " low temperature " with its preset temperature by " high-temperature " of original setting.
3. circuit protection device as claimed in claim 1 is characterized in that: this limits value is greater than this preset value.
4. an overcurrent and a method for excessive heating protection that utilizes the circuit protection device of the described device realization of claim 1 is characterized in that: the control of the overtemperature protection action restricted flow circuit of overheating protection circuit;
Wherein, when circuit protection device is activated; current-limiting circuit and overheating protection circuit move simultaneously; and respectively main circuit is carried out electric current and temperature detecting; when the output current that detects main circuit when current-limiting circuit reaches a limits value; be about to this output current and be limited in the preset value, and the preset temperature of overheating protection circuit is controlled.
5. method as claimed in claim 4; it is characterized in that: the overheating protection circuit internal preset has one high and one low two kinds of temperature; when this overheating protection circuit restricted flow circuit when control; the preset temperature of overheating protection circuit is provided in a side of this " high-temperature "; and when overheating protection circuit restricted flow circuit was controlled, overheating protection circuit then downgraded this " low temperature " with its preset temperature by " high-temperature " of original setting.
6. method as claimed in claim 4 is characterized in that: this limits value is greater than this preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021460817A CN1298089C (en) | 2002-10-25 | 2002-10-25 | Circuit protector and method for over current and over heat protection thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021460817A CN1298089C (en) | 2002-10-25 | 2002-10-25 | Circuit protector and method for over current and over heat protection thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1492557A CN1492557A (en) | 2004-04-28 |
| CN1298089C true CN1298089C (en) | 2007-01-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021460817A Expired - Fee Related CN1298089C (en) | 2002-10-25 | 2002-10-25 | Circuit protector and method for over current and over heat protection thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1298089C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI393318B (en) * | 2009-09-30 | 2013-04-11 | Genesys Logic Inc | Electrical circuit protection system and method thereof |
| CN102412558B (en) * | 2010-09-26 | 2015-07-15 | 南京德朔实业有限公司 | Over-temperature protection circuit of power device |
| CN109413767B (en) * | 2017-08-16 | 2021-01-26 | 佛山市顺德区美的电热电器制造有限公司 | Electric heating device and IGBT overheating protection method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5569999A (en) * | 1994-02-04 | 1996-10-29 | Mercedes-Benz Ag | System for monitoring the current drawn from traction batteries in electric vehicles and hybrid vehicles |
| CN1153413A (en) * | 1995-09-29 | 1997-07-02 | 摩托罗拉公司 | Protection element and method for protecting circuit |
| CN1161588A (en) * | 1996-02-21 | 1997-10-08 | 株式会社明电舍 | Method and apparatus for protecting switching element of inverter from being overheated |
-
2002
- 2002-10-25 CN CNB021460817A patent/CN1298089C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5569999A (en) * | 1994-02-04 | 1996-10-29 | Mercedes-Benz Ag | System for monitoring the current drawn from traction batteries in electric vehicles and hybrid vehicles |
| CN1153413A (en) * | 1995-09-29 | 1997-07-02 | 摩托罗拉公司 | Protection element and method for protecting circuit |
| CN1161588A (en) * | 1996-02-21 | 1997-10-08 | 株式会社明电舍 | Method and apparatus for protecting switching element of inverter from being overheated |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1492557A (en) | 2004-04-28 |
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Granted publication date: 20070131 Termination date: 20151025 |
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