CN104102269A - Novel power limiting circuit - Google Patents
Novel power limiting circuit Download PDFInfo
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- CN104102269A CN104102269A CN201410345437.9A CN201410345437A CN104102269A CN 104102269 A CN104102269 A CN 104102269A CN 201410345437 A CN201410345437 A CN 201410345437A CN 104102269 A CN104102269 A CN 104102269A
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- chip
- triode
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Abstract
The invention discloses a novel power limiting circuit comprising a BM2596 chip. The signal input end of the BM2596 chip is connected to a base of a triode Q1 through a resistor R2, and an emitter of the triode Q1 is connected to a 24V power supply. A resistor R1 is connected between the emitter of the triode Q1 and the signal input end of the BM2596 chip, a capacitor C1 and a capacitor C8 in parallel are connected between the emitter and the base of the triode Q1, a collector of the triode Q1 is connected with an FB-pin of the BM2596 chip and a resistor R3 at the same time through a resistor R4, and the other end of the resistor R3 is grounded through capacitors C4, C5 and C7 in parallel and is further connected with a VOUT end. When a load is short-circuited, since the input end still continues working, the triode Q1 is in an on state, the voltage of the FB-pin of the BM2596 chip cannot become zero, and pipeline protection effect is achieved; the BM2596 chip is used for products with high requirements on power efficiency and heat emission, and is high in quality and not easy to damage.
Description
Technical field
The present invention relates to a kind of power limit circuit, specifically a kind of new power limiting circuit.
Background technology
In a lot of application scenarios, between power supply and equipment, not close-connected, most of comprehensive power casees, for AC220V input, AC24V output and DC12V output, but use the later stage to occur that after the meeting a lot of IC heatings damage phenomenon, by observation, while being erecting equipment, do not note DC12V polarity and actual energising far to fall behind installation period again and cause the long-term short circuit of DC12V, thereby damaging.
Summary of the invention
The object of the present invention is to provide a kind of new power limiting circuit with defencive function, to solve the problem proposing in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
A kind of new power limiting circuit, comprises BM2596 chip; The signal input part of described BM2596 chip is connected to the base stage of triode Q1 by resistance R 2, the emitter of triode Q1 is connected to 24V power supply; Between the signal input part of the emitter of described triode Q1 and BM2596 chip, be connected with resistance R 1, between the emitter of triode Q1 and base stage, be connected with capacitor C in parallel 1 and capacitor C 8, the collector of triode Q1 connects FB pin and the resistance R 3 of BM2596 chip simultaneously by resistance R 4, resistance R 3 other ends are by capacitor C in parallel 4, capacitor C 5 and capacitor C 7 ground connection, and described resistance R 3 other ends also connect VOUT end; The signal input part of described BM2596 chip is also by capacitor C in parallel 6, capacitor C 2 and capacitor C 3 ground connection; GND end and the equal ground connection of switch control end of described BM2596 chip, the OUT end of described BM2596 chip connects the negative pole of diode D1 and one end of inductance L 1 simultaneously, the plus earth of diode D1, the other end of inductance L 1 also connects VOUT end.
Compared with prior art, the invention has the beneficial effects as follows: in the time that short circuit appears in load, because input end is still working on, triode Q1 is in conducting state, and the voltage of BM2596 chip FB pin also can not become zero, plays pipeline protective effect; BM2596 chip is high for power-efficient requirement, heat radiation requires high product, of fine qualities, not fragile.
Brief description of the drawings
Fig. 1 is the structural representation of new power limiting circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, a kind of new power limiting circuit, comprises BM2596 chip; The signal input part of described BM2596 chip is connected to the base stage of triode Q1 by resistance R 2, the emitter of triode Q1 is connected to 24V power supply; Between the signal input part of the emitter of described triode Q1 and BM2596 chip, be connected with resistance R 1, between the emitter of triode Q1 and base stage, be connected with capacitor C in parallel 1 and capacitor C 8, the collector of triode Q1 connects FB pin and the resistance R 3 of BM2596 chip simultaneously by resistance R 4, resistance R 3 other ends are by capacitor C in parallel 4, capacitor C 5 and capacitor C 7 ground connection, and described resistance R 3 other ends also connect VOUT end; The signal input part of described BM2596 chip is also by capacitor C in parallel 6, capacitor C 2 and capacitor C 3 ground connection; GND end and the equal ground connection of switch control end of described BM2596 chip, the OUT end of described BM2596 chip connects the negative pole of diode D1 and one end of inductance L 1 simultaneously, the plus earth of diode D1, the other end of inductance L 1 also connects VOUT end.
When work of the present invention, described resistance R 3 is adjusted output voltage during for normal work; The current sample of described resistance R 1 during for circuit working, when the electric current flowing through when resistance R 1 exceedes certain numerical value, triode Q1 will conducting, and FB pin (four pin of IC) voltage will significantly rise, IC declines output voltage, reduces the power stage of circuit; The effect of described resistance R 2 and electric capacity (capacitor C 1 is in parallel with capacitor C 8) is the emitter of level and smooth triode Q1, the voltage of base stage; In the time that short circuit appears in load, because input end is still working on, triode Q1 is in conducting state, and the voltage of BM2596 chip FB pin also can not become zero, plays pipeline protective effect.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to include in the present invention.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this instructions is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should make instructions as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.
Claims (1)
1. a new power limiting circuit, comprises BM2596 chip; It is characterized in that, the signal input part of described BM2596 chip is connected to the base stage of triode Q1 by resistance R 2, and the emitter of triode Q1 is connected to 24V power supply; Between the signal input part of the emitter of described triode Q1 and BM2596 chip, be connected with resistance R 1, between the emitter of triode Q1 and base stage, be connected with capacitor C in parallel 1 and capacitor C 8, the collector of triode Q1 connects FB pin and the resistance R 3 of BM2596 chip simultaneously by resistance R 4, resistance R 3 other ends are by capacitor C in parallel 4, capacitor C 5 and capacitor C 7 ground connection, and described resistance R 3 other ends also connect VOUT end; The signal input part of described BM2596 chip is also by capacitor C in parallel 6, capacitor C 2 and capacitor C 3 ground connection; GND end and the equal ground connection of switch control end of described BM2596 chip, the OUT end of described BM2596 chip connects the negative pole of diode D1 and one end of inductance L 1 simultaneously, the plus earth of diode D1, the other end of inductance L 1 also connects VOUT end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410345437.9A CN104102269A (en) | 2014-07-20 | 2014-07-20 | Novel power limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410345437.9A CN104102269A (en) | 2014-07-20 | 2014-07-20 | Novel power limiting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104102269A true CN104102269A (en) | 2014-10-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410345437.9A Pending CN104102269A (en) | 2014-07-20 | 2014-07-20 | Novel power limiting circuit |
Country Status (1)
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| CN (1) | CN104102269A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200627119A (en) * | 2005-01-31 | 2006-08-01 | Topower Computer Ind Co Ltd | Load-protection control circuit of power supply |
| TWI259343B (en) * | 2003-04-11 | 2006-08-01 | Mac Valves Inc | Proportional pressure regulator having positive and negative pressure delivery capability |
| CN201039545Y (en) * | 2007-04-25 | 2008-03-19 | 鹤山丽得电子实业有限公司 | A power limited circuit |
| CN202748690U (en) * | 2012-06-21 | 2013-02-20 | 湖北融通三立科技有限公司 | Power limiting circuit based on LM2576 series |
| CN203982252U (en) * | 2014-07-20 | 2014-12-03 | 苏州塔可盛电子科技有限公司 | A kind of new power limiting circuit |
-
2014
- 2014-07-20 CN CN201410345437.9A patent/CN104102269A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI259343B (en) * | 2003-04-11 | 2006-08-01 | Mac Valves Inc | Proportional pressure regulator having positive and negative pressure delivery capability |
| TW200627119A (en) * | 2005-01-31 | 2006-08-01 | Topower Computer Ind Co Ltd | Load-protection control circuit of power supply |
| CN201039545Y (en) * | 2007-04-25 | 2008-03-19 | 鹤山丽得电子实业有限公司 | A power limited circuit |
| CN202748690U (en) * | 2012-06-21 | 2013-02-20 | 湖北融通三立科技有限公司 | Power limiting circuit based on LM2576 series |
| CN203982252U (en) * | 2014-07-20 | 2014-12-03 | 苏州塔可盛电子科技有限公司 | A kind of new power limiting circuit |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141015 |