CN204287446U - A kind of power-fail detection circuit - Google Patents
A kind of power-fail detection circuit Download PDFInfo
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- CN204287446U CN204287446U CN201420767110.6U CN201420767110U CN204287446U CN 204287446 U CN204287446 U CN 204287446U CN 201420767110 U CN201420767110 U CN 201420767110U CN 204287446 U CN204287446 U CN 204287446U
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Abstract
The utility model discloses a kind of power-fail detection circuit, and comprise power down voltage comparator circuit and Port detecting circuit, power down voltage comparator circuit is electrically connected with Port detecting circuit.The utility model circuit component is few, and circuit is simple, and reliability is high, directly monitor detected power vd D, is not easy the interference being subject to the external world, can change as required voltage stabilizing diode ZD1 size thus for different power down voltage, applied widely.
Description
Technical field
The utility model relates to protection circuit field, more specifically, relates to a kind of power-fail detection circuit.
Background technology
The mode that current most of power-fail detection circuit adopts detects the scheme of forceful electric power, realizes the object detecting detected power supply power-fail.Circuit complexity and the cost of this scheme are higher, and can increase the stand-by power consumption of product.
Utility model content
The utility model provides a kind power-fail detection circuit, and this circuit low cost, power consumption are little, and structure is simple.
For reaching above-mentioned technical purpose, the technical solution of the utility model is as follows:
A kind of power-fail detection circuit, comprise power down voltage comparator circuit and Port detecting circuit, power down voltage comparator circuit is electrically connected with Port detecting circuit.
Further, described power down voltage comparator circuit comprises voltage stabilizing diode ZD1, electric capacity C1, resistance R1-R2; The power supply that voltage stabilizing diode ZD1 negative electrode and this power-fail detection circuit detect is connected, the anode of voltage stabilizing diode ZD1 respectively with one end of electric capacity C, one end of resistance R1, one end of resistance R2 is connected; The other end of electric capacity C1, the other end ground connection of resistance R1; The other end of resistance R2 is connected with Port detecting circuit.
Further, described Port detecting circuit electrical connection comprises resistance R3, triode Q1; One end of resistance R3 is connected with a standby power supply, and the other end of resistance R3 is connected with the collector of triode Q1, and the base stage of triode Q1 is connected with resistance R2, the grounded emitter of triode Q1; Tie point between resistance R3 and triode Q1 is as detection of power loss port INT.
In the utility model, by voltage stabilizing diode ZD1, detected power vd D is monitored, when detected power vd D powers on vdd voltage higher than voltage stabilizing diode ZD1 voltage of voltage regulation thus make the conducting of triode Q1, INT port is low level, during detected power vd D power down vdd voltage lower than voltage stabilizing diode ZD1 voltage of voltage regulation thus triode Q1 is ended, INT port is high level, like this by detecting change INT port producing low and high level, thus realizes the detection of power down.
Further, described standby power supply is battery or single-chip microcomputer.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
The utility model circuit component is few, and circuit is simple, and reliability is high, directly monitor power vd D, is not easy the interference being subject to the external world, can change as required voltage stabilizing diode ZD1 size thus for different power down voltage, applied widely.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described further.
Embodiment 1
As shown in Figure 1, a kind of power-fail detection circuit, comprise power down voltage comparator circuit and Port detecting circuit, power down voltage comparator circuit is electrically connected with Port detecting circuit.
In the present embodiment, power down voltage comparator circuit comprises voltage stabilizing diode ZD1, electric capacity C1, resistance R1-R2; The power supply that voltage stabilizing diode ZD1 negative electrode and this power-fail detection circuit detect is connected, the anode of voltage stabilizing diode ZD1 respectively with one end of electric capacity C, one end of resistance R1, one end of resistance R2 is connected; The other end of electric capacity C1, the other end ground connection of resistance R1; The other end of resistance R2 is connected with Port detecting circuit.
The electrical connection of Port detecting circuit comprises resistance R3, triode Q1; One end of resistance R3 is connected with a standby power supply, and the other end of resistance R3 is connected with the collector of triode Q1, and the base stage of triode Q1 is connected with resistance R2, the grounded emitter of triode Q1; Tie point between resistance R3 and triode Q1 is as detection of power loss port INT.
Standby power supply is that battery or single-chip microcomputer are for powering to port testing circuit.
The principle of work of this circuit is as follows:
(1) detected power supply electrifying and normal time:
When detected power supply electrifying, when VDD rises to the voltage of voltage regulation of voltage stabilizing diode ZD1 by 0V, voltage stabilizing diode starts voltage stabilizing, electric current is now just had to flow through voltage stabilizing diode ZD1, resistance R1 and R2, the triode Q1 conducting when the electric current flowing through R2 reaches the conducting limit of triode Q1, thus INT port obtains low level signal; When detected power supply is normal, because vdd voltage is higher than the voltage of voltage regulation of voltage stabilizing diode ZD1, so said process keeps.Now detect detected power supply electrifying and detected power supply normal.
(2) during detected power supply power-fail:
When detected power supply power-fail, vdd voltage changes from high to low, when voltage of voltage regulation lower than voltage stabilizing diode, when the electric current flowing through voltage stabilizing diode ZD1 and resistance R2 is less than the cutoff limiting of triode Q1, triode Q1 ends, thus INT port obtains high level signal.Detected power supply power-fail now detected.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection domain that all should be included in the utility model claim.
Claims (2)
1. a power-fail detection circuit, is characterized in that, comprise power down voltage comparator circuit and Port detecting circuit, power down voltage comparator circuit is electrically connected with Port detecting circuit; Described power down voltage comparator circuit comprises voltage stabilizing diode ZD1, electric capacity C1, resistance R1-R2; The power supply that voltage stabilizing diode ZD1 negative electrode and this power-fail detection circuit detect is connected, the anode of voltage stabilizing diode ZD1 respectively with one end of electric capacity C, one end of resistance R1, one end of resistance R2 is connected; The other end of electric capacity C1, the other end ground connection of resistance R1; The other end of resistance R2 is connected with Port detecting circuit; Described Port detecting circuit electrical connection comprises resistance R3, triode Q1; One end of resistance R3 is connected with a standby power supply, and the other end of resistance R3 is connected with the collector of triode Q1, and the base stage of triode Q1 is connected with resistance R2, the grounded emitter of triode Q1; Tie point between resistance R3 and triode Q1 is as detection of power loss port INT.
2. power-fail detection circuit according to claim 1, is characterized in that, described standby power supply is battery or single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420767110.6U CN204287446U (en) | 2014-12-09 | 2014-12-09 | A kind of power-fail detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420767110.6U CN204287446U (en) | 2014-12-09 | 2014-12-09 | A kind of power-fail detection circuit |
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| CN204287446U true CN204287446U (en) | 2015-04-22 |
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| CN201420767110.6U Active CN204287446U (en) | 2014-12-09 | 2014-12-09 | A kind of power-fail detection circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786853A (en) * | 2016-12-02 | 2017-05-31 | 杭州创睿新能源科技有限公司 | A kind of charging pile power down release circuit |
| 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 |
| CN107748305A (en) * | 2017-09-26 | 2018-03-02 | 九阳股份有限公司 | A kind of water purifier fault detection method and circuit |
| CN108196113A (en) * | 2017-12-30 | 2018-06-22 | 武汉长光科技有限公司 | A kind of quick warning circuit of ONU power down for PON system |
| CN108233738A (en) * | 2016-12-22 | 2018-06-29 | 赤多尼科两合股份有限公司 | Voltage conversion device |
| CN111193317A (en) * | 2020-01-22 | 2020-05-22 | 福建工程学院 | Power-down protection circuit for terminal equipment |
| CN112886697A (en) * | 2020-12-31 | 2021-06-01 | 杭州堃博生物科技有限公司 | Injection pump and power supply circuit thereof |
-
2014
- 2014-12-09 CN CN201420767110.6U patent/CN204287446U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786853A (en) * | 2016-12-02 | 2017-05-31 | 杭州创睿新能源科技有限公司 | A kind of charging pile power down release circuit |
| CN108233738A (en) * | 2016-12-22 | 2018-06-29 | 赤多尼科两合股份有限公司 | Voltage conversion device |
| CN108233738B (en) * | 2016-12-22 | 2020-11-17 | 赤多尼科两合股份有限公司 | Voltage conversion 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 |
| CN107748305A (en) * | 2017-09-26 | 2018-03-02 | 九阳股份有限公司 | A kind of water purifier fault detection method and circuit |
| CN107748305B (en) * | 2017-09-26 | 2020-05-19 | 杭州九阳净水系统有限公司 | Water purifier fault detection method and circuit |
| 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 |
| CN108196113A (en) * | 2017-12-30 | 2018-06-22 | 武汉长光科技有限公司 | A kind of quick warning circuit of ONU power down for PON system |
| CN111193317A (en) * | 2020-01-22 | 2020-05-22 | 福建工程学院 | Power-down protection circuit for terminal equipment |
| CN112886697A (en) * | 2020-12-31 | 2021-06-01 | 杭州堃博生物科技有限公司 | Injection pump and power supply circuit thereof |
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