CN201601602U - Power supplying device with short circuit protection function - Google Patents
Power supplying device with short circuit protection function Download PDFInfo
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- CN201601602U CN201601602U CN2010201264856U CN201020126485U CN201601602U CN 201601602 U CN201601602 U CN 201601602U CN 2010201264856 U CN2010201264856 U CN 2010201264856U CN 201020126485 U CN201020126485 U CN 201020126485U CN 201601602 U CN201601602 U CN 201601602U
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Abstract
The utility model relates to a power supplying device with short circuit protection function, comprising a first power supply input terminal, a second power supply input terminal, a first switch, a second switch, a processing module and a capacitor. The first switch is connected with the first power supply input terminal to receive the first power supply and composed of a first parasitic diode. The second switch is connected with the second power supply input terminal to receive the second power supply and composed of a second parasitic diode. The processing module is connected with the first power supply input terminal, the second power supply input terminal, the first switch and the second switch and controls the turn-on or turn-off of the first switch and the second switch based on the voltage values of the first power supply and the second power supply. The capacitor is connected with the second power supply input terminal and a grounding terminal. The first parasitic diode and the second parasitic diode are in reverse serial connection to prevent the current through the first parasitic diode and the second parasitic diode when short circuit or micro short circuit occurs on the capacitor and the first switch and the second switch are cut off.
Description
Technical field
The utility model relates to a kind of electric supply installation, particularly relates to a kind of electric supply installation with short-circuit protection function.
Background technology
At present, the diverter switch of single mos field effect transistor (MOSFET) as power supply adopted in the design of the power supply of most portable electric devices more, and as shown in Figure 1, Fig. 1 is the circuit diagram of the electric supply installation of existing prior art.And connecing face (PN Junction), the PN of all mos field effect transistor all has parasitic diode (Parasitic Diode).In Fig. 1, power supply can be imported by battery-end Vb, and via after the mos field effect transistor control, export by output end vo, and this mos field effect transistor is P transistor npn npn PMOS, between drain D, source S and the grid G of this P transistor npn npn PMOS three parasitic diode Dn1, Dn2 and Dn3 are arranged respectively, and battery-end Vb and output end vo and P transistor npn npn PMOS tie point are respectively equipped with first capacitor C 1 and second capacitor C 2.When CPU CPU operate as normal, can be by the signal of pin Pin output LOW voltage to P transistor npn npn PMOS, so that P transistor npn npn PMOS conducting, this moment, electric current can directly flow to source S by drain D.
When P transistor npn npn PMOS is a cut-off state, and second capacitor C 2 is at tester's painstakingly short-circuit test, or when damaging (Crack) unintentionally, the resistance value at second capacitor C, 2 two ends may drop to less than 10 ohm (Ohm), and the electric current of the P transistor npn npn PMOS that flows through can be very big, because this moment, P transistor npn npn PMOS presented not on-state, therefore have only parasitic diode Dn1 can play the conducting effect, and voltage drop is about 0.7 volt (Volt), so the power of the P transistor npn npn PMOS that flows through is that electric current is multiplied by voltage drop, may reach a watt level, the maximum power that can bear with P transistor npn npn PMOS differs greatly, and electric energy is the form performance with heat dissipation on P transistor npn npn PMOS, and may produce the high temperature that reaches Fahrenheit 100 degree, causes user or tester's safety problem.
This shows that the diverter switch of the power supply of above-mentioned existing portable electric device obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of electric supply installation of new structure with short-circuit protection function, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The purpose of this utility model is; overcome the defective that the diverter switch of the power supply of existing portable electric device exists; and provide a kind of electric supply installation of new structure with short-circuit protection function; technical problem to be solved is that it is solved when the electronic component short circuit is arranged in the electric supply installation; can produce the safety problem of high temperature, be very suitable for practicality.
The purpose of this utility model and to solve its technical problem be to adopt following technical scheme to realize.According to the electric supply installation with short-circuit protection function that the utility model proposes, it comprises one first power input, a second source input, one first switch, a second switch, a processing module and an electric capacity.First power input can provide one first power supply.The second source input can provide a second source.First switch connects first power input, and the two ends of first switch have one first parasitic diode.Second switch is connected between first switch and second source input, and the two ends of second switch have one second parasitic diode.Processing module connects first power input, second source input, first switch and second switch, and exports a control signal according to the magnitude of voltage of the first power source voltage value and second source, makes first switch and second switch conducting or closes.Electric capacity is connected between a second source input and an earth terminal.Wherein, first parasitic diode and second parasitic diode oppositely are serially connected with between first power input and second source input, to prevent that electric current is by first parasitic diode and second parasitic diode when capacitance short-circuit or micro-short circuit and first switch and second switch are closed.
The purpose of this utility model and solve its technical problem and can also be further achieved by the following technical measures.
Aforesaid electric supply installation with short-circuit protection function, wherein said first switch and this second switch are to be respectively one the one P transistor npn npn and one the 2nd P transistor npn npn.
Aforesaid electric supply installation with short-circuit protection function; wherein said processing module is to control a P transistor npn npn and the 2nd P transistor npn npn ends with the control signal of high potential, and this processing module is to control a P transistor npn npn and the 2nd P transistor npn npn conducting with the control signal of electronegative potential.
Aforesaid electric supply installation with short-circuit protection function, the drain electrode of a wherein said P transistor npn npn, grid and source electrode connect the output and the 2nd P transistor npn npn of this first power input, this control signal respectively.
Aforesaid electric supply installation with short-circuit protection function have a trixenie diode and one the 4th parasitic diode between the grid of a wherein said P transistor npn npn and source electrode, and this trixenie diode is connected in series oppositely with the 4th parasitic diode.
Aforesaid electric supply installation with short-circuit protection function, the drain electrode of wherein said the 2nd P transistor npn npn, grid and source electrode connect the output of this second source input, this control signal and the source electrode of a P transistor npn npn respectively.
Aforesaid electric supply installation with short-circuit protection function have one the 5th parasitic diode and one the 6th parasitic diode between the grid of wherein said the 2nd P transistor npn npn and source electrode, and the 5th parasitic diode is connected in series oppositely with the 6th parasitic diode.
Aforesaid electric supply installation with short-circuit protection function more comprises one second electric capacity and is connected between this first power input and this earth terminal.
Aforesaid electric supply installation with short-circuit protection function, wherein said first power input is a battery.
Aforesaid electric supply installation with short-circuit protection function, wherein said second source input are the civil power of transformation and AC-DC conversion.
The utility model compared with prior art has tangible advantage and beneficial effect.By technique scheme; the electric supply installation that the utlity model has short-circuit protection function has following advantage and beneficial effect at least: this electric supply installation with short-circuit protection function can pass through to prevent electric current by the parasitic diode that oppositely is connected in series, and can improve the fail safe that electric supply installation uses by this.
In sum, the utility model relates to a kind of electric supply installation with short-circuit protection function, comprises first power input, second source input, first switch, second switch, processing module and electric capacity.First switch connects first power input receiving first power supply, and first switch has first parasitic diode.Second switch connects the second source input with the reception second source, and second switch has second parasitic diode.Processing unit connects first power input, second source input, first switch and second switch, and according to the magnitude of voltage of first power supply and second source, controls first switch and second switch conducting or closes.Electric capacity connects second source input and earth terminal.First parasitic diode and second parasitic diode are reverse serial connection, with prevent when capacitance short-circuit or micro-short circuit and first switch and second switch by the time, electric current passes through first parasitic diode and second parasitic diode.The utility model has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solutions of the utility model, for can clearer understanding technological means of the present utility model, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present utility model can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the circuit diagram of the electric supply installation of existing prior art.
Fig. 2 is the block diagram of first embodiment of the electric supply installation with short-circuit protection function of the present utility model.
Fig. 3 is the circuit diagram of second embodiment of the electric supply installation with short-circuit protection function of the present utility model.
1: the electric supply installation 10 with short-circuit protection function: processing module
Vb: battery-end Vo: output
PMOS:P transistor npn npn PMOS1: a P transistor npn npn
PMOS2: the 2nd P transistor npn npn D: drain electrode
S: source electrode G: grid
C: 1: the first electric capacity of capacitor C
C2: the second capacitor C PU: CPU
Dn1, Dn2, Dn3: parasitic diode D1: first parasitic diode
D2: the second parasitic diode D3: trixenie diode
D4: the 4th parasitic diode D5: the 5th parasitic diode
D6: the 6th parasitic diode V1: first power input
V2: second source input S1: first switch
S2: second switch Pin: pin
P1: the first pin P2: second pin
P3: the 3rd pin
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined goal of the invention is taked; below in conjunction with accompanying drawing and preferred embodiment; to according to its embodiment of the electric supply installation with short-circuit protection function, structure, feature and the effect thereof that the utility model proposes, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present utility model can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.For convenience of description, in following embodiment, components identical is represented with identical numbering.
Seeing also shown in Figure 2ly, is the block diagram of first embodiment of the electric supply installation with short-circuit protection function of the present utility model.Among the figure, the electric supply installation 1 with short-circuit protection function comprises the first power input V1, second source input V2, first switch S 1, second switch S2, processing module 10 and capacitor C.
The first power input V1 can provide first power supply, and the second source input V2 can provide second source.First switch S 1 connects the first power input V1, and the two ends of first switch S 1 have the first parasitic diode D1.Second switch S2 is connected between first switch S 1 and the second source input V2, and the two ends of second switch S2 have the second parasitic diode D2.
Capacitor C is connected between a second source input V2 and an earth terminal.
This first power input V1 is preferably a battery, and second source input V2 is preferably the civil power through transformation and AC-DC conversion.
When processing module 10 operate as normal, mainly be to provide power supply by second source input V2, at this moment, first switch S 1 and second switch S2 are conducting state, electric current directly flows into second source input V2 by first switch S 1 to second switch S2 at last.But when the tester is making short-circuit test; or the user is when knocking or touching the internal circuit of the electric supply installation 1 with short-circuit protection function because of carelessness; capacitor C can present the state of short circuit or micro-short circuit, and makes the two ends resistance value of capacitor C less than 10 ohm (Ohm).
Yet because this first parasitic diode D1 and the second parasitic diode D2 are for oppositely being serially connected between the first power input V1 and the second source input V2; therefore when capacitor C short circuit or micro-short circuit; because the first parasitic diode D1 and the second parasitic diode D2 are for oppositely to be connected in series; therefore electric current can not flow to second source input V2 by the first power input V1 as existing prior art; therefore can protect not have big electric current on first switch and the second switch and pass through, by this with assurance tester or user's safety.
Seeing also shown in Figure 3ly, is the circuit diagram of second embodiment of the electric supply installation with short-circuit protection function of the present utility model.Compare with first embodiment, its difference is among second embodiment, first switch S 1 and second switch S2 are respectively a P transistor npn npn PMOS1 and the 2nd P transistor npn npn PMOS2, and have more second capacitor C 2 on the contact of the first power input V1 and a P transistor npn npn PMOS1.And have reverse trixenie diode D3 that is connected in series and the 4th parasitic diode D4 between the grid of a P transistor npn npn PMOS1 and source electrode, have reverse the 5th parasitic diode D5 that is connected in series and the 6th parasitic diode D6 between the grid of the 2nd P transistor npn npn PMOS2 and source electrode.Remainder is all identical, just repeats no more.
In Fig. 3, when processing module 10 operate as normal, be responsible for detecting the supply voltage value that the first power input V1 and second source input V2 are provided by the first pin P1 and the 3rd pin P3, provide the control signal of electronegative potential to make a P transistor npn npn PMOS1 and two P transistor npn npn PMOS2 conducting by the second pin P2 this moment, and the electric current of this moment flow to source electrode by the drain electrode of a P transistor npn npn PMOS1, again by the source electrode of the 2nd P transistor npn npn PMOS2 to drain electrode, arrive second source input V2 at last.But when capacitor C is short-circuited or during micro-short circuit; voltage on the second pin P2 is high potential; therefore a P transistor npn npn PMOS1 and the 2nd P transistor npn npn PMOS2 are cut-off state; but because the first parasitic diode D1 and the second parasitic diode D2 are for oppositely to be connected in series; so electric current can't flow on the capacitor C; also can't produce big electric current, and reach the purpose of short-circuit protection.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, any those skilled in the art are not in breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. electric supply installation with short-circuit protection function is characterized in that it comprises:
One provides first power input of one first power supply;
One provides the second source input of a second source;
One first switch connects this first power input, and the two ends of this first switch have one first parasitic diode;
One second switch be connected between this first switch and this second source input, and the two ends of this second switch has one second parasitic diode;
One processing module, connect this first power input, this second source input, this first switch and this second switch, and the control signal that makes this first switch and this second switch conducting or close according to the magnitude of voltage of this first power source voltage value and this second source output one; And
One electric capacity is connected between this a second source input and an earth terminal;
Wherein, this first parasitic diode and this second parasitic diode oppositely are serially connected with between this first power input and this second source input.
2. the electric supply installation with short-circuit protection function according to claim 1 is characterized in that wherein said first switch and this second switch are to be respectively one the one P transistor npn npn and one the 2nd P transistor npn npn.
3. the electric supply installation with short-circuit protection function according to claim 2; the control signal that it is characterized in that the high potential that wherein said processing module output control the one P transistor npn npn and the 2nd P transistor npn npn end, or the control signal of the electronegative potential of output control the one P transistor npn npn and the 2nd P transistor npn npn conducting.
4. the electric supply installation with short-circuit protection function according to claim 2 is characterized in that drain electrode, grid and the source electrode of a wherein said P transistor npn npn connect the output and the 2nd P transistor npn npn of this first power input, this control signal respectively.
5. the electric supply installation with short-circuit protection function according to claim 4; it is characterized in that having a trixenie diode and one the 4th parasitic diode between the grid of a wherein said P transistor npn npn and source electrode, and this trixenie diode is connected in series oppositely with the 4th parasitic diode.
6. the electric supply installation with short-circuit protection function according to claim 2 is characterized in that drain electrode, grid and the source electrode of wherein said the 2nd P transistor npn npn connects the output of this second source input, this control signal and the source electrode of a P transistor npn npn respectively.
7. the electric supply installation with short-circuit protection function according to claim 6; it is characterized in that having one the 5th parasitic diode and one the 6th parasitic diode between the grid of wherein said the 2nd P transistor npn npn and source electrode, and the 5th parasitic diode is connected in series oppositely with the 6th parasitic diode.
8. the electric supply installation with short-circuit protection function according to claim 1 is characterized in that more comprising one second electric capacity and is connected between this first power input and this earth terminal.
9. the electric supply installation with short-circuit protection function according to claim 1 is characterized in that wherein said first power input is a battery.
10. the electric supply installation with short-circuit protection function according to claim 1 is characterized in that wherein said second source input is the civil power of transformation and AC-DC conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201264856U CN201601602U (en) | 2010-03-08 | 2010-03-08 | Power supplying device with short circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201264856U CN201601602U (en) | 2010-03-08 | 2010-03-08 | Power supplying device with short circuit protection function |
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| Publication Number | Publication Date |
|---|---|
| CN201601602U true CN201601602U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201264856U Expired - Fee Related CN201601602U (en) | 2010-03-08 | 2010-03-08 | Power supplying device with short circuit protection function |
Country Status (1)
| Country | Link |
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| CN (1) | CN201601602U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099153A (en) * | 2014-05-14 | 2015-11-25 | 德克萨斯仪器德国股份有限公司 | Short-circuit protection system for power converters |
-
2010
- 2010-03-08 CN CN2010201264856U patent/CN201601602U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105099153A (en) * | 2014-05-14 | 2015-11-25 | 德克萨斯仪器德国股份有限公司 | Short-circuit protection system for power converters |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20150308 |
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| EXPY | Termination of patent right or utility model |