CN202563046U - Fuse burnout alarm device - Google Patents
Fuse burnout alarm device Download PDFInfo
- Publication number
- CN202563046U CN202563046U CN2012202444342U CN201220244434U CN202563046U CN 202563046 U CN202563046 U CN 202563046U CN 2012202444342 U CN2012202444342 U CN 2012202444342U CN 201220244434 U CN201220244434 U CN 201220244434U CN 202563046 U CN202563046 U CN 202563046U
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- fuse
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- comparer
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Abstract
The utility model discloses a fuse burnout alarm device comprising a fuse, wherein a pull-up resistor is connected between an input end of the fuse and a power supply, and a sampling resistor is connected between the other end of the fuse and a grounding end; and an input end of a comparator is connected at a joint of the pull-up resistor and the fuse, and an alarm circuit is connected with an output end of the comparator. A level signal at the joint of the fuse and the pull-up resistor is monitored in real time, and is taken as a level signal of fuse burnout; when the fuse is normal, the level signal is at a low level, and the low level output by the comparator is insufficient to drive the alarm circuit to work; when the fuse is burnt out, the level signal is at a high level, and the high level output by the comparator drives the alarm circuit to alarm, thereby users are prompted to replace the burnt fuse, and the normal operation of measuring instruments or control electronic circuits are ensured.
Description
Technical field
The utility model relates to a kind of blown fuse warning device, specifically is a kind of be used to protect instrument with current measurement function and the blown fuse warning circuit of controlling electronic circuit.
Background technology
As everyone knows; In current measurement and control electronic circuit, generally all adopt fuse (also being called fuse) as overcurrent protection; When electric current surpasses its regulation parameter value; Thereby himself fusing is broken off circuit, and metering circuit is damaged to prevent to cause because of maloperation or electric current are excessive, important devices consequence such as burns in the opertaing device.In the instrument of existing current measurement and the control electronic circuit; Can't directly show or remind the user during blown fuse; Usually need user or maintenance personal to use professional tool to detect and whether judgment device can not work because blown fuse causes; Even to take for be that equipment has other Out of order or send and repair, and causes unnecessary waste.
The utility model content
For addressing the above problem, the utility model aims to provide a kind of blown fuse warning device, and whether it can detect fuse in real time and fuse, and when blown fuse, can point out the user in time to change fuse.
For reaching above-mentioned purpose, the utility model provides a kind of blown fuse warning device, comprises a fuse,
It is characterized in that:Be connected with a pull-up resistor between fuse input end and the power supply, be connected a sample resistance between the fuse other end and the earth terminal; The input end of one comparer is connected the junction of pull-up resistor and fuse, connects a warning circuit at the output terminal of comparer.
Described warning circuit is for being buzz circuit, LED illuminating circuit or LCD symbol prompting circuit; The utility model preferentially adopts the LED illuminating circuit as warning circuit; Change fuse through the luminous prompting of LED illuminating circuit, to guarantee that measurement instrument or control electronic circuit can operate as normal.
Described LED illuminating circuit is made up of at least one current-limiting circuit and at least one LED light emitting diode serial connection, through the LED lumination of light emitting diode prompting person of making the fuse in measurement instrument or the control electronic circuit is changed.
The input end of described comparer is connected with the junction of pull-up resistor and fuse through a current limliting buffer resistance, monitors in real time through the blown fuse level signal to the junction of pull-up resistor and fuse, and the blown fuse level signal is input to the input end of comparer through the current limliting buffer resistance; When the level of the junction of pull-up resistor and fuse levels off to the power supply of pull-up resistor; Can confirm that then fuse is fused, the level of the input end of comparer is a high level, and then comparer output high level drives the warning circuit warning; Otherwise; Fuse just often, the comparer output low level, warning circuit is not reported to the police.
Described comparer is analog comparator or the digital comparator that has A/D converter, and the utility model adopts the digital comparator that has A/D converter.
The beneficial effect of the utility model is: through the level signal of real-time monitoring fuse and pull-up resistor junction, this level signal is as the level signal of blown fuse; Fuse just often, this level signal is a low level, the comparer output low level is not enough to drive warning circuit work; During blown fuse, this level signal is a high level, and comparer output high level drives warning circuit and reports to the police, and the prompting user in time changes the fuse of fusing, but guarantees measurement instrument or control electronic circuit operate as normal.
Description of drawings
Fig. 1 is the utility model electrical block diagram.
The specific embodiment circuit diagram of Fig. 2 the utility model.
Accompanying drawing is designated among the figure: 1. fuse; 2.V+ power supply; 3.GND earth terminal; 4.R0 sample resistance; 5.R1 pull-up resistor; 6.R2 current limliting buffer resistance; 7. comparer; 8. warning circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As
Fig. 1With
Fig. 2Shown a kind of blown fuse warning device, fuse 1, V+ power supply 2, GND earth terminal 3, R0 sample resistance 4, R1 pull-up resistor 5, R2 current limliting buffer resistance 6, the digital comparator 7 that has A/D converter, warning circuit 8 connect to form; Specifically: be connected R1 pull-up resistor 5 between fuse 1 input end and the V+ power supply 2; Be connected R0 sample resistance 4 between fuse 1 other end and the GND earth terminal 3; The in-phase input end of comparer 7 is through the public junction Vc of R2 current limliting buffer resistance 6 with R1 pull-up resistor 5 and fuse 1; The reference voltage circuit that serial connection one is made up of R3, R4 divider resistance between V+ power supply 2 and GND earth terminal 3, the points of common connection between R3, the R4 divider resistance is connected with the end of oppisite phase of comparer 7; The utility model is formed the LED illuminating circuit to one as warning circuit 8 by R5 current-limiting resistance and LED light emitting diode serial connection; Comparer 7 output terminals are connected with the R5 current-limiting resistance of warning circuit 8; LED light emitting diode negative pole in the warning circuit 8 is connected with the GND earth terminal, and the circuit of accomplishing the utility model connects.
Specify the principle of work of the utility model below.
As
Fig. 2Shown in; Resistance value R3=R4, it is 0.5V+ that V+ power supply 2 obtains comparer 7 benchmark gate voltages through R3, R4 dividing potential drop, when fuse 1 is fused; The public junction voltage Vc＞0.5V+ of pull-up resistor 5 and fuse 1; A1 comparer 7 output high level, the LED light emitting diode is bright, warning circuit 8 luminous alarms; At fuse 1 just often, terminal voltage Vc＜0.5V+ on the fuse 1, A1 comparer 7 output low levels, warning circuit 8 is not worked, and the LED light emitting diode does not work; Promptly under fuse 1 normal condition, because R1>>R0+Rf (Rf is the resistance of fuse own), fuse 1 upper side level Vc → 0, A1 comparer 7 output low levels, warning circuit 8 is not worked, and the LED light emitting diode does not work; When because maloperation or input current are excessive; After fuse 1 fusing, Vc ≈ V+, A1 comparer 7 output high level; The LED light emitting diode is bright; Realize warning circuit 8 luminous warnings, the prompting user will be by 1 replacement of fusing fuse, to guarantee the current instruments or the normal use of control electronic circuit.
The utility model warning device can be ignored the measuring accuracy influence of measurement instrument; Specify as follows: to the influence of measurement and control accuracy; R0 is a sample resistance 4, and voltage U0 is for measuring required voltage, the situation that influences of the R1 pull-up resistor 5 of increase, 6 couples of U0 of R2 current limliting buffer resistance on it:
According to
Fig. 1, the flow through electric current of R0 sample resistance 4 of V+ power supply 2 is I
V+=V ÷ (R0+R1); In order not influence the work of circuit-under-test or Be Controlled circuit; The R0 sample resistance 4 of measuring electric current is small resistor; And R1 pull-up resistor value is bigger, thus with V+ power supply 2 flow through R1 pull-up resistor 5, R0 sample resistance 4 electric current to the sampling influence be controlled in the accuracy requirement scope.
Sample resistance such as in multimeter, measuring the 10A electric current is generally 0.01 Ω, if add the utility model circuit, if V+=3V, R1=2M Ω, I
V+=3 ÷ (0.01+2000000)=1.5 * 10
-6A=1.5 μ A, this electric current for the current affects of measuring the 10A scope only less than 100,000/, for general multimeter, the 10A measuring accuracy is all more than 1%, so this error is to ignore; In like manner, if R2>>During R0, R2 also is negligible to the error that the shunting of input current causes.
The foregoing description only supplies to explain the usefulness of the utility model; Those skilled in the art; Under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or variation, therefore; All technical schemes that are equal to also should belong to the category of the utility model, are limited each claim.
Claims (5)
1. a blown fuse warning device comprises a fuse, it is characterized in that: be connected with a pull-up resistor between fuse input end and the power supply, be connected a sample resistance between the fuse other end and the earth terminal; The input end of one comparer is connected the junction of pull-up resistor and fuse, connects a warning circuit at the output terminal of comparer.
2. a kind of blown fuse warning device as claimed in claim 1 is characterized in that: described warning circuit is for being buzz circuit, LED illuminating circuit or LCD symbol prompting circuit.
3. a kind of blown fuse warning device as claimed in claim 1 is characterized in that: described LED illuminating circuit is made up of at least one current-limiting resistance and at least one LED light emitting diode serial connection.
4. a kind of blown fuse warning device as claimed in claim 1 is characterized in that: the input end of described comparer is connected with the junction of pull-up resistor and fuse through a current limliting buffer resistance.
5. like claim 1 or 4 described a kind of blown fuse warning devices, it is characterized in that: described comparer is analog comparator or the digital comparator that has A/D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202444342U CN202563046U (en) | 2012-05-29 | 2012-05-29 | Fuse burnout alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202444342U CN202563046U (en) | 2012-05-29 | 2012-05-29 | Fuse burnout alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202563046U true CN202563046U (en) | 2012-11-28 |
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ID=47212691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202444342U Expired - Fee Related CN202563046U (en) | 2012-05-29 | 2012-05-29 | Fuse burnout alarm device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202563046U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499767A (en) * | 2013-10-21 | 2014-01-08 | 刘海先 | Electronic instrument input fuse monitoring device |
| CN103595396A (en) * | 2013-11-04 | 2014-02-19 | 矽恩微电子(厦门)有限公司 | IC parameter correcting circuit |
| CN108614186A (en) * | 2018-07-02 | 2018-10-02 | 优利德科技(中国)股份有限公司 | The device and method of automatic detection protective tube fusing |
| CN108828285A (en) * | 2018-08-22 | 2018-11-16 | 深圳市迈斯泰克电子有限公司 | Automatic alarm device and multimeter |
| CN111383869A (en) * | 2018-12-29 | 2020-07-07 | 安波福电子(苏州)有限公司 | Novel fuse box with large current and fuse fusing early warning function |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
-
2012
- 2012-05-29 CN CN2012202444342U patent/CN202563046U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499767A (en) * | 2013-10-21 | 2014-01-08 | 刘海先 | Electronic instrument input fuse monitoring device |
| CN103595396A (en) * | 2013-11-04 | 2014-02-19 | 矽恩微电子(厦门)有限公司 | IC parameter correcting circuit |
| CN103595396B (en) * | 2013-11-04 | 2019-03-15 | 矽恩微电子(厦门)有限公司 | A kind of IC parameter correction circuit |
| CN108614186A (en) * | 2018-07-02 | 2018-10-02 | 优利德科技(中国)股份有限公司 | The device and method of automatic detection protective tube fusing |
| CN108614186B (en) * | 2018-07-02 | 2024-03-12 | 优利德科技(中国)股份有限公司 | Device and method for automatically detecting fusing of fuse tube |
| CN108828285A (en) * | 2018-08-22 | 2018-11-16 | 深圳市迈斯泰克电子有限公司 | Automatic alarm device and multimeter |
| CN111383869A (en) * | 2018-12-29 | 2020-07-07 | 安波福电子(苏州)有限公司 | Novel fuse box with large current and fuse fusing early warning function |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
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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: 20121128 Termination date: 20130529 |