CN200990495Y - Overcurrent protection state indicating circuit - Google Patents
Overcurrent protection state indicating circuit Download PDFInfo
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- CN200990495Y CN200990495Y CN 200620049562 CN200620049562U CN200990495Y CN 200990495 Y CN200990495 Y CN 200990495Y CN 200620049562 CN200620049562 CN 200620049562 CN 200620049562 U CN200620049562 U CN 200620049562U CN 200990495 Y CN200990495 Y CN 200990495Y
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- divider resistance
- voltage source
- overcurrent protection
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Abstract
The utility model provides an over current protection status indicating circuit that is connected at the two ends of the fuse between the system voltage source and connector voltage source to indicate the connection and breaking of the fuse in the indicating circuit. The utility model comprises a first voltage division circuit, a second voltage division circuit and a display circuit. The input end of the first voltage division circuit is connected with the system voltage source while the output end is the first input end of the display circuit; the input end of the second voltage circuit is connected with the connector voltage source while the output end is the second input end of the display circuit; the display circuit is provided with at least a display device which needs to have unilateral directional conductivity property and the anode of the display device is connected with the first input end while the cathode is connected with the second input end. The utility model can indicate the status of the fuse in the indicating circuit. Consumers can distinguish that where the fault is without opening the shell, which reduces the difficulty and work load of maintenance.
Description
[technical field]
The relevant a kind of overcurrent protection condition indication circuit of the utility model, particularly a kind of indicating circuit that is used to indicate circuit protection state between system voltage source and the interface voltage source.
[background technology]
Present most of electronic products is computer particularly, and the circuit of digital product adopts modularized design mostly, perhaps offers interface to connect ancillary equipment in system.Be connected with power line, holding wire and control line between each module and between system and the ancillary equipment, each module and ancillary equipment move according to system command.Between said power, holding wire, control line, holding wire and control line generally can not bring the hidden danger of secure context, and power line then is the source of circuit system potential safety hazard.Particularly present digital product video processing capacity from strength to strength, rate request is more and more faster, ancillary equipment and unit module are in quick startup, flash of light (digital camera is taken pictures moment) all may produce surge current, moreover, in production or use, the short circuit between the electronic device, overcurrents etc. all can cause the potential safety hazard of circuit.So most of circuit design all can be between the power line of intermodule, the serial connection fuse is avoided above-mentioned potential safety hazard between the system power supply supply peripheral interface power supply.Suitable and negligible resistance of resistance of fuse under the normal condition; but fuse inside will fuse by (disposable fuse) or become high-impedance state (restorability fuse under the excessive situation of electric current; recover just often to become again again low resistance state at electric current; and can use repeatedly) to cut off circuit; but; whether fuse makes the protection action because overcurrent takes place be can't see from outward appearance; open shell or do not have that check circuit has difficulties under the situation of related tool in user's inconvenience, and the workload of the complicated circuit of maintenance is just bigger.
In view of this, in fact be necessary to develop a kind of overcurrent protection condition indication circuit, the break-make of knowing the fuse between indication mechanism voltage source and the interface voltage source whether, thereby timely decision circuitry guilty culprit reduces the workload of overhauling circuit.
[summary of the invention]
Therefore, the purpose of this utility model is to provide a kind of overcurrent protection condition indication circuit, the break-make of knowing the fuse between indication mechanism voltage source and the interface voltage source whether, thereby timely decision circuitry guilty culprit reduces the workload of maintenance circuit.
For reaching above-mentioned purpose, overcurrent protection condition indication circuit of the present utility model cross-over connection is in the fuse two ends.Fuse is present in the primary circuit, and the one end is connected in system voltage source, and its other end is connected in the interface voltage source.Overcurrent protection condition indication circuit of the present utility model comprises one first bleeder circuit, one second bleeder circuit, a display circuit.The input connected system voltage source of this first bleeder circuit, and its output is the first input end of display circuit; The input connecting interface voltage source of this second bleeder circuit, and its output is second input of display circuit; This display circuit is established at least one display unit, and this display unit has unidirectional conduction, and its positive pole is connected in first input end and negative pole is connected in second input.
The voltage ratio (its output voltage and its input voltage ratio) of above-mentioned first bleeder circuit and second bleeder circuit is set, makes the voltage ratio of second bleeder circuit be not less than the voltage ratio of first bleeder circuit.So then when overcurrent protection condition indication circuit of the present utility model cross-over connection during in the fuse two ends; when the fuse normally; the input voltage value of its first bleeder circuit and second bleeder circuit much at one; because the voltage ratio of second bleeder circuit is not less than the voltage ratio of first bleeder circuit; then this moment second bleeder circuit output voltage will be not less than the output voltage of first bleeder circuit; also be the voltage that the voltage of second input of display circuit is higher than first input end; so then above-mentioned display unit is oppositely ended, and does not have the output of demonstration.Otherwise, when fuse disconnects, because the input voltage of second bleeder circuit is zero, second input of display circuit can not be got voltage from second bleeder circuit so, so the voltage of first input end will be higher than the voltage of second input, this moment, the display unit forward conduction had the output of demonstration.Can judge that thus fuse is an off-state.
Compared to prior art; the utility model passes through at fuse two ends cross-over connection one overcurrent protection condition indication circuit; the break-make that notifies the fuse between system voltage source and the interface voltage source at once whether; the user need not open just decision circuitry guilty culprit fast of shell; reduced the workload of maintenance circuit greatly; and only just can realize with simple assembly commonly used, practical and with low cost.
[description of drawings]
Fig. 1 is the composition frame chart that overcurrent protection condition indication circuit of the present utility model is connected with circuit system.
Fig. 2 is the circuit diagram that overcurrent protection condition indication circuit of the present utility model is connected with circuit system.
Fig. 3 works in the circuit diagram of indicating status for overcurrent protection condition indication circuit of the present utility model.
[embodiment]
As shown in Figure 1, the composition frame chart that is connected with circuit system for overcurrent protection condition indication circuit of the present utility model.Wherein, system voltage source 1 gives the interface voltage source 3 power supplies by a fuse 2, and overcurrent protection condition indication circuit 4 cross-over connections of the present utility model are in the two ends of fuse 2.
See also Fig. 2, the circuit diagram that is connected with circuit system for overcurrent protection condition indication circuit of the present utility model.The voltage V of system voltage source 1
XTBe transferred to interface voltage source 3 by a fuse 2, and provide voltage V by interface voltage source 1
JKGive ancillary equipment or discrete circuit module power supply (not drawing among the figure), overcurrent protection condition indication circuit 4 of the present utility model is connected across the two ends of fuse 2.This overcurrent protection condition indication circuit 4 comprises one first bleeder circuit, 41, one second bleeder circuits, 42, one display circuits 43.The input V of this first bleeder circuit 41
XTConnected system voltage source 1, and its output terminals A is the first input end A of display circuit 43; The input V of this second bleeder circuit 42
JKConnecting interface voltage source 3, and its output B is the second input B of display circuit 43; This display circuit 43 is established at least one display unit.
The display unit of display circuit 43 can be made as a unusual indicator light LED2 in the present embodiment, and it must have unidirectional conduction.Its positive pole is connected in first input end A, and negative pole is connected in the second input B. present embodiment and is made as a light-emitting diode, and its color is made as red, yellow or green according to user's custom and hobby.In addition, also set up a normality indicator light LED1 in the present embodiment, it has unidirectional conduction.Its negative pole is connected in first input end A, and positive pole is connected in the second input B.This normality indicator light LED1 can be made as light-emitting diode equally, and its color should differ from the color of unusual indicator light LED2.And when system voltage source 1 and interface voltage source 3 normallies, this second driving voltage V2 should be made as and be higher than the first driving voltage V1, and its difference must be greater than the voltage of lighting of normality indicator light LED1.According to Ohm's law and Ampere's law, in the present embodiment, can be by regulating the first divider resistance R
11With the second divider resistance R
10, the 3rd divider resistance R
21With the 4th divider resistance R
20Thereby resistance value ratio set the voltage to earth value of node A and Node B, set the first divider resistance R
11With the second divider resistance R
10, the 3rd divider resistance R
21With the 4th divider resistance R
20Thereby resistance value ratio make the voltage (the second driving voltage V2) of Node B be higher than the voltage (the first driving voltage V1) of node A, and both differences are more than or equal to the voltage of lighting of normality indicator light LED1.
See also shown in Figure 2, when fuse 4 is in the normally state, the second driving voltage V2 (being the voltage of Node B) that second bleeder circuit 42 offers display circuit 43 is higher than the first driving voltage V1 (being the voltage of node A) that first bleeder circuit 41 offers display circuit 43, and the voltage difference of the two is higher than the voltage of lighting of normality indicator light LED1, and this moment, normality indicator light LED1 was lighted and unusual indicator light LED2 ends.When not establishing this normality indicator light, unusual indicator light LED2 understands the remain off state equally.As shown in Figure 3; when system voltage source 1 situation of overcurrent occurs for interface voltage source 3 supply currents by a fuse 4; fuse 4 is made the protection action and is disconnected; this moment Node B can't be from the interface voltage source 3 minutes voltage; then the voltage of node A will be higher than the voltage of Node B; promptly the first driving voltage V1 is higher than the second driving voltage V2, and unusual indicator light LED2 is lighted thereby normality indicator light LED1 ends.Whether so then the user need not open shell or measurement, only lighted by observing unusual indicator light LED2, just can have overcurrent condition to take place in the clear and definite decision circuitry, and the on off operating mode of fuse.
Compared to prior art; the utility model passes through at fuse two ends cross-over connection one overcurrent protection condition indication circuit; notify the situation whether overcurrent has taken place in the circuit at once; make the user in time find the fault place; reduced the workload of maintenance circuit greatly; and only just can realize with simple assembly commonly used, practical and with low cost.
Claims (9)
1, a kind of overcurrent protection condition indication circuit, the two ends of the fuse of cross-over connection between system voltage source and interface voltage source, the overcurrent protection state in order to real-time indicating circuit is characterized in that: comprise
One first bleeder circuit, the input of this first bleeder circuit is connected in system voltage source;
One second bleeder circuit, the input of second bleeder circuit is connected in the interface voltage source, and its voltage ratio is greater than the voltage ratio of above-mentioned first bleeder circuit;
One display circuit, this display circuit is established a first input end and one second input, its first input end is connected in the output of above-mentioned first bleeder circuit, and its second input is connected in the output of above-mentioned second bleeder circuit, and this display circuit is established at least one display unit, display unit has unidirectional conduction, and its positive pole is connected in first input end, and negative pole is connected in second input.
2, overcurrent protection condition indication circuit as claimed in claim 1 is characterized in that: this first bleeder circuit is made as a variable resistance.
3, overcurrent protection condition indication circuit as claimed in claim 1; it is characterized in that: this first bleeder circuit is made as and comprises one first divider resistance; one second divider resistance; wherein first divider resistance and second divider resistance are series between system voltage source and the ground wire, and are connected in first input end by the node that is connected between first divider resistance and second divider resistance.
4, overcurrent protection condition indication circuit as claimed in claim 1 is characterized in that: this second bleeder circuit is made as a variable resistance.
5, overcurrent protection condition indication circuit as claimed in claim 1; it is characterized in that: second bleeder circuit is for comprising one the 3rd divider resistance; one the 4th divider resistance; and the 3rd divider resistance and the 4th divider resistance are series between interface voltage source and the ground wire, and are connected in second input by the node that is connected between the 3rd divider resistance and the 4th divider resistance.
6, overcurrent protection condition indication circuit as claimed in claim 1; it is characterized in that: this display unit can be made as a unusual indicator light; it must have unidirectional conduction, and its positive pole is connected in the first input end of display circuit, and negative pole is connected in second input of display circuit.
7, overcurrent protection condition indication circuit as claimed in claim 6 is characterized in that: this unusual indicator light can be made as a light-emitting diode.
8, overcurrent protection condition indication circuit as claimed in claim 1; it is characterized in that: this display circuit is set up a normality indicator light; it has unidirectional conduction; its negative pole is connected in the first input end of display circuit; and its positive pole is connected in second input of display circuit, and when system voltage source and interface voltage source normally the difference of second driving voltage and first driving voltage more than or equal to the voltage of lighting of normality indicator light.
9, overcurrent protection condition indication circuit as claimed in claim 8 is characterized in that: this normality indicator light is made as a light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620049562 CN200990495Y (en) | 2006-12-26 | 2006-12-26 | Overcurrent protection state indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620049562 CN200990495Y (en) | 2006-12-26 | 2006-12-26 | Overcurrent protection state indicating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200990495Y true CN200990495Y (en) | 2007-12-12 |
Family
ID=38941529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620049562 Expired - Fee Related CN200990495Y (en) | 2006-12-26 | 2006-12-26 | Overcurrent protection state indicating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200990495Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175943A (en) * | 2011-02-12 | 2011-09-07 | 中兴通讯股份有限公司 | Load overcurrent protector state detection device and method |
-
2006
- 2006-12-26 CN CN 200620049562 patent/CN200990495Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175943A (en) * | 2011-02-12 | 2011-09-07 | 中兴通讯股份有限公司 | Load overcurrent protector state detection device and method |
| CN102175943B (en) * | 2011-02-12 | 2013-12-11 | 中兴通讯股份有限公司 | Load overcurrent protector state detection device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071212 Termination date: 20111226 |