CN201937463U - Short-circuit current limiting circuit, power supply and loading equipment - Google Patents
Short-circuit current limiting circuit, power supply and loading equipment Download PDFInfo
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- CN201937463U CN201937463U CN2010206924301U CN201020692430U CN201937463U CN 201937463 U CN201937463 U CN 201937463U CN 2010206924301 U CN2010206924301 U CN 2010206924301U CN 201020692430 U CN201020692430 U CN 201020692430U CN 201937463 U CN201937463 U CN 201937463U
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Abstract
The utility model discloses a short-circuit current limiting circuit, a power supply and loading equipment. The short-circuit current limiting circuit comprises a first resistor and a second resistor in parallel connection, when a circuit connected with the short-circuit current limiting circuit is short-circuited, the resistance of the first resistor increases till the first resistor is open-circuit; and both the power supply and the loading equipment comprise the short-circuit current limiting circuit. The short-circuit current limiting circuit can still ensure the output current of the power supply to be steadily controlled within a certain range when the load is in a long-term short-circuited condition; in addition, the circuit is simple and reliable and easy to realize.
Description
Technical field
The utility model relates to the electronic power supply field, is specifically related to a kind of short circuit current limitation circuit, power supply and load equipment.
Background technology
In some occasion; the active filter of the communications industry for example; even the long-time short circuit of load; also require power supply can export the electric current of certain limit; the short-circuit protection circuit that is adopted is the current-limiting type short-circuit protection circuit in such cases; now, the method for designing for the current-limiting type short-circuit protection circuit is: restriction of constant-current type electric current and the restriction of reentrant type electric current.
The restriction of constant-current type electric current is nothing but three kinds of schemes from the design of circuit: the one, and the duty ratio of by-pass cock pipe is fallen electric current little as far as possible; But, owing to be subjected to the restriction of minimum duty cycle, and if the impedance of short-circuit loop enough little, then the electric current during short circuit is still very big.The 2nd, introduce other constant-current source for output, still, and the circuit complexity, power consumption is bigger.The 3rd, the method that secondary is regulated in advance.Allow most of unnecessary energy consumption on the passive resistance rather than on the transistor of consumption at series regulator.Shortcoming is to need to increase preposition adjuster, and whole power loss is still bigger.
The restriction of reentrant type electric current is owing to " locking " phenomenon of nonlinear load, interconnection load, so general recommendations is not then used the foldback current limit circuit if not necessary.
The utility model content
The purpose of this utility model is to solve the deficiency that exists in the above-mentioned background technology, be in long-term short-circuit condition even propose a kind of load, the short circuit current limitation circuit still can make power supply outputting current steadily be controlled in certain scope and the simple and reliable short circuit current limitation circuit of circuit.
For achieving the above object, the utility model is by the following technical solutions:
A kind of short circuit current limitation circuit, described short circuit current limitation circuit comprises first resistance and second resistance, described first resistance and the second resistance parallel connection, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance increases to first resistance interruption.
Described first resistance is positive temperature coefficient PTC thermistor.
Described positive temperature coefficient PTC thermistor is a saltant positive temperature coefficient PTC thermistor.
Described first resistance is resettable fuse.
Described second resistance is wire-wound resistor or cement resistor or metal oxidation resistance.
When with circuit operate as normal that described short circuit current limitation circuit links to each other, the resistance of described second resistance is greater than the resistance of described first resistance, and when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance is greater than the resistance of second resistance.
A kind of power supply comprises output rectifier and filter, and described power supply also comprises above-mentioned described short circuit current limitation circuit, and described short circuit current limitation circuit is connected on the output of described output rectifier and filter.
A kind of load equipment comprises load, and described load equipment also comprises above-mentioned described short circuit current limitation circuit, and described short circuit current limitation circuit is connected on the input of described load.
The short circuit current limitation circuit that the utility model provides adopts first resistance and the second resistance parallel connection, electric current only passes through from first resistance when with circuit operate as normal that the short circuit current limitation circuit links to each other, the resistance value of first resistance increases rapidly when circuit is short-circuited fault, until infinite, output current changes into from second resistance and flowing through.At this moment, electric current equals the resistance of the voltage of short circuit current limitation circuit input end divided by second resistance, thus restriction maximum output current when realizing short circuit.With respect to prior art, this kind short circuit current limitation circuit design is simple and reliable, and when short circuit, maximum output current obtains stable control.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit diagram of a kind of short circuit current limitation circuit of the utility model embodiment one;
Fig. 2 is the circuit diagram of a kind of power supply of the utility model embodiment two;
Fig. 3 is the circuit diagram of a kind of load equipment of the utility model embodiment three.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one, a kind of short circuit current limitation circuit, as shown in Figure 1, described short circuit current limitation circuit comprises first resistance R 1 and second resistance R 2, described first resistance R 1 and 2 parallel connections of second resistance R, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance increases to first resistance interruption.
Wherein, first resistance R 1 can be selected positive temperature coefficient PTC thermistor, and positive temperature coefficient PTC thermistor is the PTC thermistor, is a kind of resistance value presents step evolution along with the rising of PTC thermistor body temperature increase, temperature is high more, the resistance that resistance value is big more.When with short circuit that the PTC thermistor links to each other, the electric current by the PTC thermistor increases, and resistance temperature raises, and resistance increases, until resistance interruption.
Concrete, described positive temperature coefficient PTC thermistor can be a saltant positive temperature coefficient PTC thermistor.The characteristic of saltant PTC thermistor is that the temperature when resistance is increased to Curie temperature when above, its resistance value is phase step type to be increased, can reach 4～10 orders of magnitude, saltant positive temperature coefficient PTC thermistor can in time open circuit, like this when short circuit, the short circuit current limitation circuit just can be made sensitive reaction, and first resistance interruption flows to load with the blocking-up electric current by R1.
Described first resistance can also be resettable fuse, also can be when short circuit, and the resistance value of R1 increases to R1 and opens circuit.
Choosing of first resistance mainly is to have utilized resistance along with the rising of resistance self-temperature can increase characteristic until a quasi-resistance that opens circuit in the present embodiment, and concrete resistance type does not constitute restriction of the present utility model.
Described second resistance R 2 can be wire-wound resistor or cement resistor or metal oxidation resistance.The common ground of choosing this quasi-resistance is that the resistance of resistance is subjected to Temperature Influence very little with respect to first resistance R 1, can ignore.The particular type of second resistance does not constitute restriction of the present utility model yet.
The short circuit current limitation circuit of present embodiment adopts the mode of first resistance R 1 and 2 parallel connections of second resistance R, when with circuit operate as normal that described short circuit current limitation circuit links to each other, the resistance of described second resistance is greater than the resistance of described first resistance, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance is greater than the resistance of second resistance.Concrete, the described circuit that links to each other with the short circuit current limitation circuit can be load and power supply, described short circuit current limitation circuit is connected in series with power output end and load input terminal respectively.
Concrete, less by the current ratio of first resistance R 1 during owing to the load operate as normal, the heat of generation and the heat of distributing reach balance, and temperature is lower, and resistance value is constant substantially, and element is in low resistive state.At this moment, the resistance of R1 is far smaller than the resistance of R2, so output current only flows through from R1 basically.
When being short-circuited property of load fault; electric current by first resistance R 1 is very big; the heat that produces can be greater than the heat that distributes; make component temperature increase suddenly; in this stage; very little variations in temperature can cause the significantly raising of resistance; at this moment element is in high-impedance state; the increase of impedance has limited electric current; electric current sharply descended in very short time; thereby the protection load equipment is avoided damaging, as long as the heat that the enough elements of the heat that electric current produced that pass through give out, the element that is under the variable condition just can be in operate condition always.That is to say, when being short-circuited property of load fault, along with the resistance value of R1 increases rapidly, until infinite; Output current changes into from R2 and flowing through.At this moment, electric current equals electric power output voltage divided by R2, thus restriction maximum output current when realizing short circuit.When passing through the current vanishes of R1, along with temperature descends, R1 just can revert to normal operating conditions again automatically.
The short circuit current limitation circuit structure that embodiment one provides is simple, and when the long-term short circuit of load, the maximum output current of power supply can access stable control, to supply with load.
Embodiment two, a kind of power supply as shown in Figure 2, comprise output rectifier and filter, and described power supply also comprises embodiment one described short circuit current limitation circuit, and described short circuit current limitation circuit is connected on the output of described output rectifier and filter.
Described short circuit current limitation circuit comprises first resistance R 1 and second resistance R 2, described first resistance R 1 and 2 parallel connections of second resistance R, and when load short circuits that power supply is supplied with, the resistance of described first resistance increases to first resistance interruption.
Wherein, first resistance R 1 can be selected positive temperature coefficient PTC thermistor, and positive temperature coefficient PTC thermistor is the PTC thermistor, is a kind of resistance value presents step evolution along with the rising of PTC thermistor body temperature increase, temperature is high more, the resistance that resistance value is big more.When with short circuit that the PTC thermistor links to each other, the electric current by the PTC thermistor increases, and resistance temperature raises, and resistance increases, until resistance interruption.
Concrete, described positive temperature coefficient PTC thermistor can be a saltant positive temperature coefficient PTC thermistor.The characteristic of saltant PTC thermistor is that the temperature when resistance is increased to Curie temperature when above, its resistance value is phase step type to be increased, can reach 4～10 orders of magnitude, saltant positive temperature coefficient PTC thermistor can in time open circuit, like this when short circuit, the short circuit current limitation circuit just can be made sensitive reaction, and first resistance interruption flows to load with the blocking-up electric current by R1.
Described first resistance can also be resettable fuse, also can be when short circuit, and the resistance value of R1 increases to R1 and opens circuit.
Choosing of first resistance mainly is to have utilized resistance along with the rising of resistance self-temperature can increase characteristic until a quasi-resistance that opens circuit in the present embodiment, and concrete resistance type does not constitute restriction of the present utility model.
Described second resistance R 2 can be wire-wound resistor or cement resistor or metal oxidation resistance.The common ground of choosing this quasi-resistance is that the resistance of resistance is subjected to Temperature Influence very little with respect to first resistance R 1, can ignore.The particular type of second resistance does not constitute restriction of the present utility model yet.
The short circuit current limitation circuit of present embodiment adopts the mode of first resistance R 1 and 2 parallel connections of second resistance R, when with circuit operate as normal that described short circuit current limitation circuit links to each other, the resistance of described second resistance is greater than the resistance of described first resistance, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance is greater than the resistance of second resistance.
Described power supply comprises output rectifier and filter, and then, described short circuit current limitation circuit is serially connected in the output of described output rectifier and filter, constitutes the part of power supply.Power supply also comprises other part, does not do detailed introduction at this.
Concrete, when load operate as normal that power supply is supplied with, less by the current ratio of first resistance R 1, the heat of generation and the heat of distributing reach balance, and temperature is lower, and resistance value is constant substantially, and element is in low resistive state.At this moment, the resistance of R1 is far smaller than the resistance of R2, so output current only flows through from R1 basically.
When being short-circuited property of load fault that power supply is supplied with; electric current by first resistance R 1 is very big; the heat that produces can be greater than the heat that distributes; make component temperature increase suddenly; in this stage; very little variations in temperature can cause the significantly raising of resistance; at this moment element is in high-impedance state; the increase of impedance has limited electric current; electric current sharply descended in very short time; thereby the protection power supply is avoided damaging with the load that links to each other with power supply, as long as the heat that the enough elements of the heat that electric current produced that pass through give out, the element that is under the variable condition just can be in operate condition always.That is to say, when being short-circuited property of load fault, along with the resistance value of R1 increases rapidly, until infinite; Output current changes into from R2 and flowing through, for load.At this moment, electric current equals electric power output voltage divided by R2, thus restriction maximum output current when realizing short circuit.When passing through the current vanishes of R1, along with temperature descends, R1 just can revert to normal operating conditions again automatically.
The power supply that embodiment two provides; comprised the short circuit current limitation circuit described in the embodiment one; can be when the long-term short circuit of load; the maximum output current of power supply obtains stable control; both blocked big electric current by load with the protection load; guarantee the power supply of load again, also played the effect of protection power supply.
Embodiment three, a kind of load equipment as shown in Figure 3, comprise load, and described load equipment also comprises embodiment one described short circuit current limitation circuit, and described short circuit current limitation circuit is connected on the input of described load.
Described short circuit current limitation circuit comprises first resistance R 1 and second resistance R 2, described first resistance R 1 and 2 parallel connections of second resistance R, and when load short circuits, the resistance of described first resistance increases to first resistance interruption.
Wherein, first resistance R 1 can be selected positive temperature coefficient PTC thermistor, and positive temperature coefficient PTC thermistor is the PTC thermistor, is a kind of resistance value presents step evolution along with the rising of PTC thermistor body temperature increase, temperature is high more, the resistance that resistance value is big more.When with short circuit that the PTC thermistor links to each other, the electric current by the PTC thermistor increases, and resistance temperature raises, and resistance increases, until resistance interruption.
Concrete, described positive temperature coefficient PTC thermistor can be a saltant positive temperature coefficient PTC thermistor.The characteristic of saltant PTC thermistor is that the temperature when resistance is increased to Curie temperature when above, its resistance value is phase step type to be increased, can reach 4～10 orders of magnitude, saltant positive temperature coefficient PTC thermistor can in time open circuit, like this when short circuit, the short circuit current limitation circuit just can be made sensitive reaction, and first resistance interruption flows to load with the blocking-up electric current by R1.
Described first resistance can also be resettable fuse, also can be when short circuit, and the resistance value of R1 increases to R1 and opens circuit.
Choosing of first resistance mainly is to have utilized resistance along with the rising of resistance self-temperature can increase characteristic until a quasi-resistance that opens circuit in the present embodiment, and concrete resistance type does not constitute restriction of the present utility model.
Described second resistance R 2 can be wire-wound resistor or cement resistor or metal oxidation resistance.The common ground of choosing this quasi-resistance is that the resistance of resistance is subjected to Temperature Influence very little with respect to first resistance R 1, can ignore.The particular type of second resistance does not constitute restriction of the present utility model yet.
The short circuit current limitation circuit of present embodiment adopts the mode of first resistance R 1 and 2 parallel connections of second resistance R, when with load operate as normal that described short circuit current limitation circuit is connected, the resistance of described second resistance is greater than the resistance of described first resistance, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance is greater than the resistance of second resistance.
Then, described short circuit current limitation circuit is serially connected in load input terminal, and described load equipment may comprise multichannel loading, and in this case, the short circuit current limitation circuit can be serially connected in the input of the load of required protection.
Concrete, less by the current ratio of first resistance R 1 during owing to loaded work piece, the heat of generation and the heat of distributing reach balance, and temperature is lower, and resistance value is constant substantially, and element is in low resistive state.At this moment, the resistance of R1 is far smaller than the resistance of R2, so output current only flows through from R1 basically.
When being short-circuited property of load fault; electric current by first resistance R 1 is very big; the heat that produces can be greater than the heat that distributes; make component temperature increase suddenly; in this stage; very little variations in temperature can cause the significantly raising of resistance; at this moment element is in high-impedance state; the increase of impedance has limited electric current; electric current sharply descended in very short time; thereby the protection load is avoided damaging, as long as the heat that the enough elements of the heat that electric current produced that pass through give out, the element that is under the variable condition just can be in operate condition always.That is to say, when being short-circuited property of load fault, along with the resistance value of R1 increases rapidly, until infinite; Output current changes into from R2 and flowing through, for load.At this moment, electric current equals electric power output voltage divided by R2, thus restriction maximum output current when realizing short circuit.When passing through the current vanishes of R1, along with temperature descends, R1 just can revert to normal operating conditions again automatically, for load.
The load equipment that embodiment three provides; comprised the short circuit current limitation circuit described in the embodiment one, can be when the long-term short circuit of load, the maximum output current of power supply obtains stable control; both blocked big electric current by load with the protection load, guaranteed the power supply of load again.
More than several specific embodiments of the present utility model are described in detail, wherein:
The short circuit current limitation circuit that the utility model provides adopts first resistance and the second resistance parallel connection, electric current only passes through from first resistance when with circuit operate as normal that the short circuit current limitation circuit links to each other, the resistance value of first resistance increases rapidly when circuit is short-circuited fault, until infinite, output current changes into from second resistance and flowing through.At this moment, electric current equals the resistance of the voltage of short circuit current limitation circuit input end divided by second resistance, thus restriction maximum output current when realizing short circuit.With respect to prior art, this kind short circuit current limitation circuit design is simple and reliable, need not constant-current source and preposition adjuster, and when short circuit, maximum output current obtains stable control.
Power supply that the utility model provides and load equipment include this kind short circuit current limitation circuit, power supply and can both obtain effective current-limiting protection when loading on short circuit.
Used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (8)
1. short circuit current limitation circuit, it is characterized in that described short circuit current limitation circuit comprises first resistance and second resistance, described first resistance and the second resistance parallel connection, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance increases to first resistance interruption.
2. short circuit current limitation circuit according to claim 1 is characterized in that, described first resistance is positive temperature coefficient PTC thermistor.
3. short circuit current limitation circuit according to claim 2 is characterized in that, described positive temperature coefficient PTC thermistor is a saltant positive temperature coefficient PTC thermistor.
4. short circuit current limitation circuit according to claim 1 is characterized in that, described first resistance is resettable fuse.
5. short circuit current limitation circuit according to claim 1 is characterized in that, described second resistance is wire-wound resistor or cement resistor or metal oxidation resistance.
6. according to any described short circuit current limitation circuit of claim 1-5, it is characterized in that, when with circuit operate as normal that described short circuit current limitation circuit links to each other, the resistance of described second resistance is greater than the resistance of described first resistance, when with short circuit that described short circuit current limitation circuit links to each other, the resistance of described first resistance is greater than the resistance of second resistance.
7. a power supply comprises output rectifier and filter, it is characterized in that, described power supply also comprises any described short circuit current limitation circuit of claim 1-6, and described short circuit current limitation circuit is connected on the output of described output rectifier and filter.
8. a load equipment comprises load, it is characterized in that, described load equipment also comprises any described short circuit current limitation circuit of claim 1-6, and described short circuit current limitation circuit is connected on the input of described load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206924301U CN201937463U (en) | 2010-12-31 | 2010-12-31 | Short-circuit current limiting circuit, power supply and loading equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206924301U CN201937463U (en) | 2010-12-31 | 2010-12-31 | Short-circuit current limiting circuit, power supply and loading equipment |
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| Publication Number | Publication Date |
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| CN201937463U true CN201937463U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206924301U Expired - Fee Related CN201937463U (en) | 2010-12-31 | 2010-12-31 | Short-circuit current limiting circuit, power supply and loading equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346206A (en) * | 2011-09-13 | 2012-02-08 | 深圳桑菲消费通信有限公司 | Device and method for protecting overheating device |
| CN105098742A (en) * | 2014-04-29 | 2015-11-25 | 瑞侃电子(上海)有限公司 | Current balance control unit, electric appliance part, electric appliance component and circuit |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
| CN113691167A (en) * | 2021-08-23 | 2021-11-23 | 江苏华凯能源科技有限公司 | Intelligent power saving device with self-adjusting impedance and use method thereof |
-
2010
- 2010-12-31 CN CN2010206924301U patent/CN201937463U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346206A (en) * | 2011-09-13 | 2012-02-08 | 深圳桑菲消费通信有限公司 | Device and method for protecting overheating device |
| CN105098742A (en) * | 2014-04-29 | 2015-11-25 | 瑞侃电子(上海)有限公司 | Current balance control unit, electric appliance part, electric appliance component and circuit |
| CN105098742B (en) * | 2014-04-29 | 2019-01-18 | 上海利韬电子有限公司 | Current balance type control unit, electric component, electric appliance component and circuit |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
| CN110336264B (en) * | 2019-08-22 | 2024-01-26 | 成都铁达电子股份有限公司 | Voltage limiting circuit |
| CN113691167A (en) * | 2021-08-23 | 2021-11-23 | 江苏华凯能源科技有限公司 | Intelligent power saving device with self-adjusting impedance and use method thereof |
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Address after: 518104, Guangdong, Shenzhen province Baoan District manhole Street oyster road manhole Industrial Company Third Industrial Zone A1, A2, A3 101 and 2 layers, A4 Patentee after: Shenzhen Tat Fook Technology Co., Ltd. Address before: 518108 Bao'an District, Shenzhen City, Guangdong Province, Shiyan Town, love group with the rich industrial area A \ B Dong Patentee before: Shenzhen Tat Fook Technology Co., Ltd. |
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Granted publication date: 20110817 Termination date: 20151231 |
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