CN201689129U - Power-down detecting device - Google Patents
Power-down detecting device Download PDFInfo
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- CN201689129U CN201689129U CN2010201748549U CN201020174854U CN201689129U CN 201689129 U CN201689129 U CN 201689129U CN 2010201748549 U CN2010201748549 U CN 2010201748549U CN 201020174854 U CN201020174854 U CN 201020174854U CN 201689129 U CN201689129 U CN 201689129U
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- photoelectrical coupler
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Abstract
The utility model relates to a power-down detecting device which comprises more than two connecting loops, a photoelectric coupler and a comparator. Each connecting loop is composed of a current-limiting resistor and a rectifying diode which are sequentially connected in series, a phase wire of an AC power supply is connected outside the input end of the current-limiting resistor, the output end of each rectifying diode is respectively connected at a common end point of the connecting loops, and the common end point is connected with the first input end of the photoelectric coupler; a neutral wire of the AC power supply is connected outside the second input end of the photoelectric coupler, and a voltage-stabilizing power supply is connected outside the first output end of the photoelectric coupler; the positive-phase input end of the comparator is connected with the second output end of the photoelectric coupler, the voltage-stabilizing power supply is connected outside the negative-phase input end of the comparator, and a CPU is connected outside the output end of the comparator. The power-down detecting device adopts the AC power supply (AC220V) as a detecting source without magnetic retardation; as the response of a power-down signal is quick, the power-down detecting device can timely reflect the real condition of current power supply of a power grid, so as to ensure the safety and reliability of a terminal.
Description
Technical field
The utility model relates to a kind of power loss detection means, belongs to power supply control technology field.
Background technology
Along with the function of power consumer power information acquisition terminal constantly strengthens, acquisition terminal is also more and more higher to the requirement of the promptness of power-off signal, reliability.Power-off signal not only is related to the accuracy that power failure information reports, the promptness that backup battery switches, and also is related to the security of stored information reliability.
At present, existing power-off signal produces and testing process is: AC power (AC220V) is through step-down transformer and rectifier bridge, and output DC V, direct current V are again through electric resistance partial pressure, and output power-off signal VF to CPU detects (as shown in Figure 1).Because direct current V is again the input source of other power supplys, need high capacity filter capacitor in parallel, just can obtain effective power-off signal; And, because there is hysteresis in transformer, can cause the power-off signal response slow, mainly show as, when powering on, power-off signal rises very slow, and during power down, power-off signal descends also very slow.Like this, just be difficult to reflect timely and effectively the real conditions of mains supply, for security, the reliability of terminal have been buried hidden danger.
The utility model content
The purpose of this utility model is: overcomes the problem that prior art exists, a kind of power loss detection means is provided, and simple and practical, can reflect the real conditions of mains supply timely and effectively.
In order to reach above purpose, power loss detection means of the present utility model comprises two above link circuits, photoelectrical coupler and comparers; It is characterized in that, described each link circuit is made of the current-limiting resistance and the commutation diode of series connection successively, the phase line of the input end external AC power supply of current-limiting resistance, the output terminal of commutation diode all is connected in the common end points of link circuit, and described common end points inserts the first input end of photoelectrical coupler; The center line of the second input end external AC power supply of described photoelectrical coupler, the first output terminal external power supply of described photoelectrical coupler; The normal phase input end of described comparer is connected with second output terminal of photoelectrical coupler, the negative-phase input external power supply of described comparer, the output terminal cpu peripheral of described comparer.
The utility model further improves as follows:
1. the common end points of described link circuit is connected with the photoelectrical coupler first input end through first resistance;
2. bridge joint has first electric capacity, voltage stabilizing diode and the bi-directional voltage stabilizing diode that is relation in parallel between described photoelectrical coupler first input end and second input end;
3. described first electric capacity, voltage stabilizing diode and bi-directional voltage stabilizing diode all are positioned at the side away from photoelectrical coupler of described first resistance at the access point of photoelectrical coupler first input end side;
4. described photoelectrical coupler second output terminal is connected with the normal phase input end of comparer through inductance;
5. described inductance two ends are parallel with second resistance and second electric capacity of series connection successively, and the link of the described inductance and second resistance inserts photoelectrical coupler second output terminal, and the link of the described inductance and second electric capacity inserts the normal phase input end of comparer;
6. the link ground connection of described second resistance and second electric capacity;
7. the negative-phase input of described comparer is through the 3rd resistance external power supply;
8. the link of the negative-phase input of described the 3rd resistance and comparer is through the 4th resistance eutral grounding.
Power loss detection means of the present utility model is a detection resources with AC power (AC220V), does not have hysteresis, and the power-off signal response can in time reflect the real conditions of current mains supply rapidly, can guarantee security, the reliability of terminal.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
The circuit theory diagrams that Fig. 1 produces and detects for the prior art power-off signal.
Fig. 2 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Embodiment
The power loss detection means of present embodiment comprises three link circuits, photoelectrical coupler U27 and comparer U30 as shown in Figure 2.
First link circuit constitutes the phase line UA` of the input end external AC power supply of current-limiting resistance R83 by current-limiting resistance R83, R84 and the commutation diode D29 of series connection successively; Second link circuit constitutes the phase line UB` of the input end external AC power supply of current-limiting resistance R85 by current-limiting resistance R85, R88 and the commutation diode D30 of series connection successively; The 3rd link circuit constitutes the phase line UC` of the input end external AC power supply of current-limiting resistance R89 by current-limiting resistance R89, R90 and the commutation diode D31 of series connection successively; Commutation diode D29, the D30 of above-mentioned three link circuits, the output terminal of D31 all are connected in the common end points of link circuit; This common end points is connected with photoelectrical coupler U27 input end 1 pin through first resistance R 30; The center line UN of the input end 2 pin external AC power supplies of photoelectrical coupler U27.Wherein, first, second, third link circuit plays resistance current limliting and half-wave rectification.
Bridge joint has first capacitor C 8, voltage stabilizing diode D28 and the bi-directional voltage stabilizing diode D27 that is relation in parallel between photoelectrical coupler U27 input end 1 pin and input end 2 pin; These three elements all are positioned at the side away from photoelectrical coupler of first resistance R 30 at the access point of photoelectrical coupler U27 input end 1 pin side.Wherein, first capacitor C 8 strobes; Voltage stabilizing diode D28, bi-directional voltage stabilizing diode D27 can maintain photoelectrical coupler U27 input terminal voltage about 5V, prevent too high voltages damage photoelectrical coupler U27.
The external 3V3 power supply of photoelectrical coupler U27 output terminal 4 pin, output terminal 3 pin are connected with comparer U30 normal phase input end through inductance L 6.Photoelectrical coupler U27 can play the electric effect of isolating, to reduce the interference that the light current circuit is subjected to.
Comparer U30 negative-phase input is through the 3rd resistance R 92 external 3V3 power supplys, and the link of the 3rd resistance R 92 and comparer U30 negative-phase input is through the 4th resistance R 93 ground connection.Under the effect of 3V3 power supply, the 3rd resistance R 92 and the 4th resistance R 93, the voltage of comparer U30 negative-phase input is stabilized in about 1.25V, prevents to produce wrong power-off signal because of the mains supply fluctuation.
Comparer U30 output terminal cpu peripheral (not shown).
The course of work of present embodiment power loss detection means is: AC power (AC220V) is after the resistance current limliting and half-wave rectification of first, second, third link circuit, drive photoelectrical coupler U27 through first resistance R 30 and send signal to comparer U30, this signal is input comparator U30 normal phase input end after inductance L 6; When mains supply normal (have at least one mutually normal), the normal phase input end voltage of comparer U30 promptly is higher than negative-phase input voltage about 2.8V, and the power-off signal VF that its output terminal sends is a high level, and the expression mains supply is normal; When electric network power-fail, AC power descends gradually to the driving force of photoelectrical coupler U27, and comparer U30 normal phase input end voltage also descends thereupon, drop to below the 1.25V at it, when promptly being lower than negative-phase input voltage, the power-off signal VF that its output terminal sends is a low level, the expression electric network power-fail.
The present embodiment power loss detection means is a detection resources with AC power (AC220V), does not have hysteresis, and the power-off signal response can in time reflect the real conditions of current mains supply rapidly, can guarantee security, the reliability of terminal.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (9)
1. a power loss detection means comprises two above link circuits, photoelectrical coupler and comparers; It is characterized in that, described each link circuit is made of the current-limiting resistance and the commutation diode of series connection successively, the phase line of the input end external AC power supply of current-limiting resistance, the output terminal of commutation diode all is connected in the common end points of link circuit, and described common end points inserts the first input end of photoelectrical coupler; The center line of the second input end external AC power supply of described photoelectrical coupler, the first output terminal external power supply of described photoelectrical coupler; The normal phase input end of described comparer is connected with second output terminal of photoelectrical coupler, the negative-phase input external power supply of described comparer, the output terminal cpu peripheral of described comparer.
2. power loss detection means according to claim 1 is characterized in that: the common end points of described link circuit is connected with the photoelectrical coupler first input end through first resistance.
3. power loss detection means according to claim 2 is characterized in that: bridge joint has first electric capacity, voltage stabilizing diode and the bi-directional voltage stabilizing diode that is relation in parallel between described photoelectrical coupler first input end and second input end.
4. power loss detection means according to claim 3 is characterized in that: described first electric capacity, voltage stabilizing diode and bi-directional voltage stabilizing diode all are positioned at the side away from photoelectrical coupler of described first resistance at the access point of photoelectrical coupler first input end side.
5. power loss detection means according to claim 1 is characterized in that: described photoelectrical coupler second output terminal is connected with the normal phase input end of comparer through inductance.
6. power loss detection means according to claim 5, it is characterized in that: described inductance two ends are parallel with second resistance and second electric capacity of series connection successively, the link of the described inductance and second resistance inserts photoelectrical coupler second output terminal, and the link of the described inductance and second electric capacity inserts the normal phase input end of comparer.
7. power loss detection means according to claim 6 is characterized in that: the link ground connection of described second resistance and second electric capacity.
8. power loss detection means according to claim 1 is characterized in that: the negative-phase input of described comparer is through the 3rd resistance external power supply.
9. power loss detection means according to claim 8 is characterized in that: the link of the negative-phase input of described the 3rd resistance and comparer is through the 4th resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201748549U CN201689129U (en) | 2010-04-29 | 2010-04-29 | Power-down detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201748549U CN201689129U (en) | 2010-04-29 | 2010-04-29 | Power-down detecting device |
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| Publication Number | Publication Date |
|---|---|
| CN201689129U true CN201689129U (en) | 2010-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201748549U Expired - Fee Related CN201689129U (en) | 2010-04-29 | 2010-04-29 | Power-down detecting device |
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| CN (1) | CN201689129U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257272A (en) * | 2013-05-02 | 2013-08-21 | 江苏大学 | Power failure detection circuit and detection method for alternating current (AC) power supply |
| CN106353572A (en) * | 2015-07-17 | 2017-01-25 | 无锡市晶源微电子有限公司 | Output end power-down detection device and on-off conversion power source system with same |
| CN107703405A (en) * | 2017-09-26 | 2018-02-16 | 九阳股份有限公司 | A kind of water purifier power failure detection method |
| CN109031038A (en) * | 2018-05-25 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of method and circuit for realizing power fail warning in PON far end system |
| 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 |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
-
2010
- 2010-04-29 CN CN2010201748549U patent/CN201689129U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257272A (en) * | 2013-05-02 | 2013-08-21 | 江苏大学 | Power failure detection circuit and detection method for alternating current (AC) power supply |
| CN103257272B (en) * | 2013-05-02 | 2016-03-02 | 江苏大学 | A kind of communication power supply power-fail detection circuit and detection method |
| CN106353572A (en) * | 2015-07-17 | 2017-01-25 | 无锡市晶源微电子有限公司 | Output end power-down detection device and on-off conversion power source system with same |
| CN106353572B (en) * | 2015-07-17 | 2018-09-21 | 无锡市晶源微电子有限公司 | Output end power loss detection means and switch conversion power-supply system with the device |
| CN107703405A (en) * | 2017-09-26 | 2018-02-16 | 九阳股份有限公司 | A kind of water purifier power failure detection method |
| CN107703405B (en) * | 2017-09-26 | 2020-06-12 | 杭州九阳小家电有限公司 | Power failure detection method for water purifier |
| 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 |
| CN109031038A (en) * | 2018-05-25 | 2018-12-18 | 烽火通信科技股份有限公司 | A kind of method and circuit for realizing power fail warning in PON far end system |
| CN110794196A (en) * | 2018-08-01 | 2020-02-14 | 中兴通讯股份有限公司 | Alternating current power failure detection method and device and communication equipment |
| CN111122955A (en) * | 2018-10-31 | 2020-05-08 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
| CN111122955B (en) * | 2018-10-31 | 2021-10-01 | 宁波方太厨具有限公司 | Overvoltage detection circuit applied to range hood |
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Legal Events
| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20180429 |