CN204925291U - Circuit board falls electrical detection circuitry - Google Patents
Circuit board falls electrical detection circuitry Download PDFInfo
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- CN204925291U CN204925291U CN201520508903.0U CN201520508903U CN204925291U CN 204925291 U CN204925291 U CN 204925291U CN 201520508903 U CN201520508903 U CN 201520508903U CN 204925291 U CN204925291 U CN 204925291U
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Abstract
The utility model relates to a circuit design technique field, concretely relates to circuit board falls electrical detection circuitry, include: resistance R961, resistance R962, resistance R963, electric capacity C602, electric capacity C603, electric capacity C604, zener diode U122 and voltage comparater U121, resistance R961's one end is connected and is surveyed power end VCC, and when 0.8 times of the voltage subnormality value of being surveyed power VCC, voltage comparater U121's output becomes the low level by the high level, infories the external control system to be surveyed power end VCC and falls, the utility model discloses a simple electronic components constitutes to fall electrical detection circuitry, and the cost is lower, and the overall arrangement space of having practiced thrift the circuit board.
Description
Technical field
The utility model relates to technical field of circuit design, is specifically related to a kind of circuit board power-fail detection circuit.
Background technology
In current design of electronic products, in most cases, need storage unit divided data when power supply power-fail, Given this plant situation, how to detect power supply power-fail, become the precondition that data are preserved; In prior art, often adopt special chip to do detection of power loss, produce a signal when power down to electronic electric energy meter chip, electronic electric energy meter chip completes corresponding power down process again, and this power-fail detection circuit is complicated and cost is high.
Utility model content
The purpose of this utility model is to propose a kind of circuit board power-fail detection circuit, can by simple electronic devices and components composition power-fail detection circuit, and cost is lower, and has saved the arrangement space of circuit board.
For reaching this object, the utility model by the following technical solutions:
As an aspect of the present utility model, a kind of circuit board power-fail detection circuit provided, comprise: resistance R961, resistance R962, resistance R963, electric capacity C602, electric capacity C603, electric capacity C604, voltage stabilizing diode U122 and voltage comparator U121, wherein, one end of resistance R961 connects tested power end VCC, the other end of resistance R961 and one end of resistance R962, one end of electric capacity C602 and the terminal 1 of voltage comparator U121 link together, other end ground connection together with the other end of electric capacity C602 of resistance R962, one end of resistance R963 connects working power end VCC_3V3, the other end of resistance R963 and one end of electric capacity C603, the terminal 3 of voltage comparator U121, the negative pole of voltage stabilizing diode U122 and the reference pole of voltage stabilizing diode U122 link together, positive pole ground connection together with the other end of electric capacity C603 of voltage stabilizing diode U122, terminal 2 ground connection of voltage comparator U121, the terminal 5 of voltage comparator U121 links together with one end of electric capacity C604 and working power end VCC_3V3, the other end ground connection of electric capacity C604, the terminal 4 of voltage comparator U121 connects VCC_check node.
Preferably, the model of described voltage stabilizing diode U122 is LM431AIM3, and the voltage stabilizing value of described voltage stabilizing diode U122 is 2.5V, and the model of voltage comparator U121 is LMV931MG.
Preferably, the terminal 3 of voltage comparator U121 is at working power end VCC_3V3, resistance R963, under the effect of electric capacity C603 and voltage stabilizing diode U122, remain on a stable reference voltage 2.5V, when tested power end VCC is normal, the voltage of the terminal 1 of voltage comparator U121 is greater than 2.5V, now, because terminal 1 voltage of voltage comparator U121 is higher than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can export a lasting 3.3V high level, when the Voltage Drop of tested power end VCC is to when being less than 0.8*VCC, then the voltage of the terminal 1 of voltage comparator U121 can be less than 2.5V, now, because terminal 1 voltage of voltage comparator U121 is lower than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can become low level from original normal high level, and be sent to external control system by VCC_check node.
Preferably, described electric capacity C602, electric capacity C603 and electric capacity C604 are filter capacitor.
Preferably, described resistance R961 and resistance R962 is divider resistance.
Preferably, described resistance R963 is dropping resistor.
The beneficial effects of the utility model are: a kind of circuit board power-fail detection circuit, comprise: resistance R961, resistance R962, resistance R963, electric capacity C602, electric capacity C603, electric capacity C604, voltage stabilizing diode U122 and voltage comparator U121, wherein, one end of resistance R961 connects tested power end VCC, the other end of resistance R961 and one end of resistance R962, one end of electric capacity C602 and the terminal 1 of voltage comparator U121 link together, other end ground connection together with the other end of electric capacity C602 of resistance R962, one end of resistance R963 connects working power end VCC_3V3, the other end of resistance R963 and one end of electric capacity C603, the terminal 3 of voltage comparator U121, the negative pole of voltage stabilizing diode U122 and the reference pole of voltage stabilizing diode U122 link together, positive pole ground connection together with the other end of electric capacity C603 of voltage stabilizing diode U122, terminal 2 ground connection of voltage comparator U121, the terminal 5 of voltage comparator U121 links together with one end of electric capacity C604 and working power end VCC_3V3, the other end ground connection of electric capacity C604, the terminal 4 of voltage comparator U121 connects VCC_check node, the utility model is by simple electronic devices and components composition power-fail detection circuit, cost is lower, and saved the arrangement space of circuit board.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of a kind of circuit board power-fail detection circuit that the utility model embodiment provides.
Embodiment
The technical solution of the utility model is further illustrated by embodiment below in conjunction with Fig. 1.
Fig. 1 is the circuit diagram of a kind of circuit board power-fail detection circuit that the utility model embodiment provides.
A kind of circuit board power-fail detection circuit, comprise: resistance R961, resistance R962, resistance R963, electric capacity C602, electric capacity C603, electric capacity C604, voltage stabilizing diode U122 and voltage comparator U121, wherein, one end of resistance R961 connects tested power end VCC, the other end of resistance R961 and one end of resistance R962, one end of electric capacity C602 and the terminal 1 of voltage comparator U121 link together, other end ground connection together with the other end of electric capacity C602 of resistance R962, one end of resistance R963 connects working power end VCC_3V3, the other end of resistance R963 and one end of electric capacity C603, the terminal 3 of voltage comparator U121, the negative pole of voltage stabilizing diode U122 and the reference pole of voltage stabilizing diode U122 link together, positive pole ground connection together with the other end of electric capacity C603 of voltage stabilizing diode U122, terminal 2 ground connection of voltage comparator U121, the terminal 5 of voltage comparator U121 links together with one end of electric capacity C604 and working power end VCC_3V3, the other end ground connection of electric capacity C604, the terminal 4 of voltage comparator U121 connects VCC_check node.
In the present embodiment, the model of described voltage stabilizing diode U122 is LM431AIM3, and the voltage stabilizing value of described voltage stabilizing diode U122 is 2.5V, and the model of voltage comparator U121 is LMV931MG.
In the present embodiment, the terminal 3 of voltage comparator U121 is at working power end VCC_3V3, resistance R963, under the effect of electric capacity C603 and voltage stabilizing diode U122, remain on a stable reference voltage 2.5V, when tested power end VCC is normal, the voltage of the terminal 1 of voltage comparator U121 is greater than 2.5V, reason is: 0.8*VCC*R962/ (R961+R962)=2.5V, then VCC*R962/ (R961+R962) >2.5V, wherein, the VCC of above-mentioned formula represents the voltage of tested power end VCC, R961 represents the resistance value of resistance R961, R962 represents the resistance value of resistance R962, now, because terminal 1 voltage of voltage comparator U121 is higher than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can export a lasting 3.3V high level, when the Voltage Drop of tested power end VCC is to when being less than 0.8*VCC, then the voltage of the terminal 1 of voltage comparator U121 can be less than 2.5V, now, because terminal 1 voltage of voltage comparator U121 is lower than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can become low level from original normal high level, and be sent to external control system by VCC_check node, whether control system can know VCC power down by the change of this road level of detecting, then follow-up action can be started.
In the present embodiment, described electric capacity C602, electric capacity C603 and electric capacity C604 are filter capacitor, can reduce the noise of power supply everywhere.
In the present embodiment, described resistance R961 and resistance R962 is divider resistance, selects suitable resistance, 0.8*VCC can be divided to about 2.5V.
In the present embodiment, described resistance R963 is dropping resistor, under the effect of voltage stabilizing diode U122, VCC_3V3 can be dropped to about 2.5V.
The foregoing is only embodiment of the present utility model, these describe just in order to explain principle of the present utility model, and can not be interpreted as the restriction to the utility model protection domain by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other specific implementation method of the present utility model, and these modes all will fall within protection domain of the present utility model.
Claims (6)
1. a circuit board power-fail detection circuit, it is characterized in that, comprise: resistance R961, resistance R962, resistance R963, electric capacity C602, electric capacity C603, electric capacity C604, voltage stabilizing diode U122 and voltage comparator U121, wherein, one end of resistance R961 connects tested power end VCC, the other end of resistance R961 and one end of resistance R962, one end of electric capacity C602 and the terminal 1 of voltage comparator U121 link together, other end ground connection together with the other end of electric capacity C602 of resistance R962, one end of resistance R963 connects working power end VCC_3V3, the other end of resistance R963 and one end of electric capacity C603, the terminal 3 of voltage comparator U121, the negative pole of voltage stabilizing diode U122 and the reference pole of voltage stabilizing diode U122 link together, positive pole ground connection together with the other end of electric capacity C603 of voltage stabilizing diode U122, terminal 2 ground connection of voltage comparator U121, the terminal 5 of voltage comparator U121 links together with one end of electric capacity C604 and working power end VCC_3V3, the other end ground connection of electric capacity C604, the terminal 4 of voltage comparator U121 connects VCC_check node.
2. a kind of circuit board power-fail detection circuit according to claim 1, is characterized in that, the model of described voltage stabilizing diode U122 is LM431AIM3, and the voltage stabilizing value of described voltage stabilizing diode U122 is 2.5V, and the model of voltage comparator U121 is LMV931MG.
3. a kind of circuit board power-fail detection circuit according to claim 2, it is characterized in that, the terminal 3 of voltage comparator U121 is at working power end VCC_3V3, resistance R963, under the effect of electric capacity C603 and voltage stabilizing diode U122, remain on a stable reference voltage 2.5V, when tested power end VCC is normal, the voltage of the terminal 1 of voltage comparator U121 is greater than 2.5V, now, because terminal 1 voltage of voltage comparator U121 is higher than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can export a lasting 3.3V high level, when the Voltage Drop of tested power end VCC is to when being less than 0.8*VCC, then the voltage of the terminal 1 of voltage comparator U121 can be less than 2.5V, now, because terminal 1 voltage of voltage comparator U121 is lower than the voltage of terminal 3, so the terminal 4 of voltage comparator U121 can become low level from original normal high level, and be sent to external control system by VCC_check node.
4. a kind of circuit board power-fail detection circuit according to claim 1, is characterized in that, described electric capacity C602, electric capacity C603 and electric capacity C604 are filter capacitor.
5. a kind of circuit board power-fail detection circuit according to claim 1, is characterized in that, described resistance R961 and resistance R962 is divider resistance.
6. a kind of circuit board power-fail detection circuit according to claim 1, is characterized in that, described resistance R963 is dropping resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520508903.0U CN204925291U (en) | 2015-07-14 | 2015-07-14 | Circuit board falls electrical detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520508903.0U CN204925291U (en) | 2015-07-14 | 2015-07-14 | Circuit board falls electrical detection circuitry |
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| Publication Number | Publication Date |
|---|---|
| CN204925291U true CN204925291U (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520508903.0U Expired - Fee Related CN204925291U (en) | 2015-07-14 | 2015-07-14 | Circuit board falls electrical detection circuitry |
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| CN (1) | CN204925291U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788212A (en) * | 2016-03-04 | 2016-07-20 | 北京理工大学珠海学院 | Intelligent wireless meter reading system and communication method thereof |
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
-
2015
- 2015-07-14 CN CN201520508903.0U patent/CN204925291U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788212A (en) * | 2016-03-04 | 2016-07-20 | 北京理工大学珠海学院 | Intelligent wireless meter reading system and communication method thereof |
| CN105788212B (en) * | 2016-03-04 | 2019-01-15 | 北京理工大学珠海学院 | A kind of Intelligent wireless meter reading system and its communication means |
| CN110501553A (en) * | 2018-05-17 | 2019-11-26 | 中兴通讯股份有限公司 | A kind of power failure warning circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20210714 |