CN206074715U - A kind of direct current power-fail detection circuit - Google Patents
A kind of direct current power-fail detection circuit Download PDFInfo
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- CN206074715U CN206074715U CN201621061473.3U CN201621061473U CN206074715U CN 206074715 U CN206074715 U CN 206074715U CN 201621061473 U CN201621061473 U CN 201621061473U CN 206074715 U CN206074715 U CN 206074715U
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- comparator
- electrical switch
- electric capacity
- divider resistance
- power
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Abstract
This utility model direct current power-fail detection circuit, including hysteresis loop comparator and back-up source, wherein back-up source includes electrical switch, electric capacity and charging resistor, hysteresis loop comparator includes the first divider resistance, second divider resistance and feedback resistance, first divider resistance two ends are connected with positive source and comparator positive pole, second divider resistance two ends are connected with power supply ground and comparator positive pole, comparator negative pole connects reference power source, feedback resistance is connected between the output stage of comparator and positive pole, the output stage of comparator is connected with the control pole of electrical switch, the input of electrical switch is connected with capacitance cathode, outfan is connected with electric capacity one end by charging resistor, the electric capacity other end is grounded.Power supply is compared with reference voltage after first, second divider resistance partial pressure, and when voltage drops to identical, the power-off signal control electrical switch opening of comparator output, electric capacity is load supplying.The reliability service in the case where electrical network or the unexpected increasing of load cause supply voltage unstable.
Description
Technical field
This utility model is related to power control circuit technical field, more particularly to a kind of direct current power-fail detection circuit.
Background technology
Power-down protection circuit is all, when voltage is less than a certain reference value, to export a level to microcontroller mostly at present,
Microcontroller enters power-down mode；When voltage is higher than reference value, then a level is exported to microcontroller, microcontroller is entered
Normal mode of operation.When realization is used, disturb because of electrical network, the reason such as unexpected increasing of load causes the power supply electricity for detecting
Existing fluctuation is extruded, situation of the supply voltage less than reference value higher than reference value is frequently alternately present, and causes equipment to occur abnormal.
The content of the invention
This utility model is mainly solving the technical problems that provide a kind of direct current power-fail detection circuit, the direct current detection of power loss
Circuit can adjust the circuit of detection of power loss reference value lower limit and the upper limit, and being increased in electrical network or load suddenly causes supply voltage not
Reliably run in the case of stable.
In order to solve the above problems, this utility model provides a kind of direct current power-fail detection circuit, the direct current detection of power loss electricity
Road includes hysteresis loop comparator, isolating diode D1 and back-up source, wherein the back-up source include electrical switch, electric capacity C1 and
Charging resistor R4, the hysteresis loop comparator include the first divider resistance R1, the second divider resistance R2 and feedback resistance R3, first point
One end of piezoresistance R1 is connected to positive source, and the other end and the second divider resistance R2 are connected to comparator positive pole jointly, second point
The another of piezoresistance R2 terminates at power supply ground, and the negative pole of comparator connects reference power source, and feedback resistance R3 is connected on the output of comparator
Level and positive pole, the output stage of comparator are connected with the control pole of electrical switch, and the input of electrical switch terminates at the positive pole of C1, defeated
Go out end to be connected with electric capacity C1 one end by charging resistor R4, electric capacity C1 other ends ground connection, when power supply is normal, power supply is by filling
Resistance R4 charges for electric capacity C1；When supply voltage is less than power down voltage V1, electrical switch is opened, and electric capacity C1 is negative.
Further saying, the electric capacity C1 is large bulk capacitance, which is at least more than 0.1F.
Further saying, isolating diode, the outfan connection of electrical switch Q are being provided between charging resistor R4 and power supply
Between isolating diode D1 and charging resistor R4.
Further saying, the electrical switch is metal-oxide-semiconductor.
This utility model direct current power-fail detection circuit, including hysteresis loop comparator, isolating diode D1 and back-up source, wherein
The back-up source includes electrical switch, electric capacity C1 and charging resistor R4, the hysteresis loop comparator include the first divider resistance R1,
One end of second divider resistance R2 and feedback resistance R3, the first divider resistance R1 is connected to positive source, the other end and second point
Piezoresistance R2 is connected to comparator positive pole jointly, and the another of the second divider resistance R2 terminates at power supply ground, and the negative pole of comparator connects ginseng
Power supply is examined, feedback resistance R3 is connected on the output stage and positive pole of comparator, the output stage of comparator and the control pole phase of electrical switch Q
Connect, the input of electrical switch terminates at the positive pole of C1, outfan is connected with electric capacity C1 one end by charging resistor R4, electric capacity C1
The other end is grounded.Voltage V0 of the supply voltage after the first divider resistance R1 and the second divider resistance R2 partial pressures, feeding compare
Device positive pole is compared with the reference voltage Vref for being connected to comparator negative pole, when supply voltage is normal, comparator output high level.
When supply voltage Vin declines, V0 is reduced with the reduction of supply voltage, when V0=Vref, comparator output low level
Power-off signal control electrical switch open, electric capacity C1 be load supplying, if Vin now be V1.When supply voltage is raised,
V0 is raised with the rising of supply voltage Vin, as Vin=V1, due to the presence of feedback resistance R3, V0<Vref, until V0
When being more than Vref with the rising of supply voltage Vin, comparator can just export high level, close electrical switch, if now
Vin is V2.By the value for adjusting the first divider resistance R1, the second divider resistance R2 and divider resistance R3, expection can be obtained and thought
The V1 for wanting and the value of V2.The circuit of detection of power loss reference value lower limit and the upper limit can be adjusted, is increased in electrical network or load suddenly and is led
Reliably run in the case of sending a telegraph source spread of voltage.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or accompanying drawing to be used is briefly described needed for description of the prior art, it should be apparent that, and the accompanying drawing in describing is this practicality
Some new embodiments, to those skilled in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is direct current power-fail detection circuit embodiment electrical schematic diagram.
With reference to embodiment, and referring to the drawings, the realization, functional characteristics and advantage to this utility model purpose is made into one
Step explanation.
Specific embodiment
In order that want the purpose of utility model, technical scheme and advantage clearer, below in conjunction with this utility model reality
The accompanying drawing in example is applied, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described
Embodiment is a part of embodiment of utility model, rather than the embodiment of whole.Based on the embodiment in this utility model, ability
The every other embodiment obtained on the premise of creative work is not made by domain those of ordinary skill, belongs to practical
Novel protected scope.
As shown in figure 1, a kind of direct current power-fail detection circuit embodiment of this utility model.
The direct current power-fail detection circuit includes hysteresis loop comparator, isolating diode D1 and back-up source, wherein the standby
Power supply includes electrical switch Q, electric capacity C1 and charging resistor R4, the hysteresis loop comparator include the first divider resistance R1, second point
One end of piezoresistance R2 and feedback resistance R3, the first divider resistance R1 is connected to positive source, the other end and the second divider resistance
R2 is connected to comparator positive pole jointly, and the another of the second divider resistance R2 terminates at power supply ground, and the negative pole of comparator connects reference power source,
Feedback resistance R3 is connected on the output stage and positive pole of comparator, and the output stage of comparator is connected with the control pole of electrical switch Q, electronics
The input of switch Q terminates at the positive pole of C1, and outfan is connected with electric capacity C1 one end by charging resistor R4, the electric capacity C1 other ends
Ground connection, when power supply is normal, power supply is charged for electric capacity C1 by charging resistor R4；When supply voltage is less than power down voltage V1,
Electrical switch Q is opened, and electric capacity C1 is negative.
Specifically, the hysteresis loop comparator is used for the detection voltage of the detection voltage for arranging power down and upper electricity.The electricity
Appearance C1 be large bulk capacitance, its size be at least more than 0.1F.Isolating diode is provided between charging resistor R4 and power supply, should
The presence of isolating diode can preferably extend the cruising time of back-up source, and the outfan of electrical switch Q is connected to isolation two
Between pole pipe D1 and charging resistor R4.The electrical switch Q can adopt metal-oxide-semiconductor, or other can realize switching function
Electronic device.
During work, voltage V0 of the supply voltage after the first divider resistance R1 and the second divider resistance R2 partial pressures sends into
Comparator positive pole is compared with the reference voltage Vref for being connected to comparator negative pole, and when supply voltage is normal, comparator output is high
Level.When supply voltage Vin declines, V0 is reduced with the reduction of supply voltage, when V0=Vref, comparator output
Low level power-off signal control electrical switch Q is opened, and electric capacity C1 is load supplying, if Vin now is V1, in electric capacity C1 is
During load supplying, back-up sources of the electric capacity C1 equivalent to load supplying.When supply voltage is raised, V0 is with supply voltage Vin
Rising and raise, as Vin=V1, due to the presence of feedback resistance R3, V0<Vref, until V0 is with supply voltage Vin's
When raising and being more than Vref, comparator can just export high level, close electrical switch Q, if Vin now is V2.By adjusting
The value of the first divider resistance R1, the second divider resistance R2 and divider resistance R3, can obtain the value of the expected V1 for wanting and V2.
Above example only to illustrate the technical solution of the utility model, rather than a limitation；Although with reference to aforementioned reality
Apply example to be described in detail this utility model, it will be understood by those within the art that：Which still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic, and these
Modification is replaced, and does not make the essence of appropriate technical solution depart from the spirit and model of each embodiment technical scheme of this utility model
Enclose.
Claims (4)
1. a kind of direct current power-fail detection circuit, it is characterised in that：Including hysteresis loop comparator, isolating diode D1 and back-up source,
Wherein described back-up source includes electrical switch, electric capacity C1 and charging resistor R4, and the hysteresis loop comparator includes the first partial pressure electricity
Resistance R1, the second divider resistance R2 and feedback resistance R3, one end of the first divider resistance R1 are connected to positive source, the other end and the
Two divider resistance R2 are connected to comparator positive pole jointly, and the another of the second divider resistance R2 terminates at power supply ground, the negative pole of comparator
Reference power source is connect, feedback resistance R3 is connected on the output stage and positive pole of comparator, the output stage of comparator and the control of electrical switch
Pole connects, and the input of electrical switch terminates at the positive pole of C1, and outfan is connected with electric capacity C1 one end by charging resistor R4, the electricity
Hold C1 other ends ground connection, when power supply is normal, power supply is charged for electric capacity C1 by charging resistor R4；When supply voltage is less than power down
During voltage V1, electrical switch is opened, and electric capacity C1 is negative.
2. direct current power-fail detection circuit according to claim 1, it is characterised in that the electric capacity C1 is large bulk capacitance,
Which is at least 0.1F.
3. direct current power-fail detection circuit according to claim 1, it is characterised in that set between charging resistor R4 and power supply
The outfan for having isolating diode, electrical switch is connected between isolating diode D1 and charging resistor R4.
4. direct current power-fail detection circuit according to claim 1, it is characterised in that the electrical switch is metal-oxide-semiconductor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016200154729 | 2016-01-09 | ||
| CN201620015472 | 2016-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206074715U true CN206074715U (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621061473.3U Expired - Fee Related CN206074715U (en) | 2016-01-09 | 2016-09-19 | A kind of direct current power-fail detection circuit |
Country Status (1)
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| CN (1) | CN206074715U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991455A (en) * | 2019-01-30 | 2019-07-09 | 国网浙江省电力有限公司衢州供电公司 | Battery compensation system after a kind of intelligent electric meter battery undervoltage |
| CN110456139A (en) * | 2019-08-19 | 2019-11-15 | 深圳市双翼科技股份有限公司 | A kind of power fail warning device of PON equipment |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
| CN114019418A (en) * | 2021-11-10 | 2022-02-08 | 南京能瑞自动化设备股份有限公司 | Power failure detection circuit for Internet of things electric energy meter and Internet of things electric energy meter |
| CN114020132A (en) * | 2021-10-15 | 2022-02-08 | 苏州浪潮智能科技有限公司 | PG signal circuit |
-
2016
- 2016-09-19 CN CN201621061473.3U patent/CN206074715U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991455A (en) * | 2019-01-30 | 2019-07-09 | 国网浙江省电力有限公司衢州供电公司 | Battery compensation system after a kind of intelligent electric meter battery undervoltage |
| CN109991455B (en) * | 2019-01-30 | 2021-01-26 | 国网浙江省电力有限公司衢州供电公司 | Battery compensation system after intelligent electric meter battery under-voltage |
| CN110456139A (en) * | 2019-08-19 | 2019-11-15 | 深圳市双翼科技股份有限公司 | A kind of power fail warning device of PON equipment |
| CN110456139B (en) * | 2019-08-19 | 2022-01-11 | 深圳市双翼科技股份有限公司 | Power failure warning device of PON equipment |
| CN113484589A (en) * | 2021-06-30 | 2021-10-08 | 杭州加速科技有限公司 | Power-off detection circuit with hysteresis function and control system |
| CN113484589B (en) * | 2021-06-30 | 2024-09-17 | 杭州加速科技有限公司 | Power failure detection circuit with hysteresis function and control system |
| CN114020132A (en) * | 2021-10-15 | 2022-02-08 | 苏州浪潮智能科技有限公司 | PG signal circuit |
| CN114020132B (en) * | 2021-10-15 | 2023-07-14 | 苏州浪潮智能科技有限公司 | PG signal circuit |
| CN114019418A (en) * | 2021-11-10 | 2022-02-08 | 南京能瑞自动化设备股份有限公司 | Power failure detection circuit for Internet of things electric energy meter and Internet of things electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Ping Inventor after: Zhang Yongchao Inventor before: Chen Ping |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200113 Address after: 518000 South Block 509, 5th Floor, Yuanxing Science and Technology Building, No. 1 North Songpingshan Road, North Ring Road, Nanshan High-tech Park, Shenzhen City, Guangdong Province Patentee after: Shenzhen material union Microelectronics Co., Ltd. Address before: 518000 Guangdong province Huizhou City Zhongkai high tech Development Zone, financial venture building 18 building 801 room Patentee before: HUIZHOU INTERNET OF THINGS MICROELECTRONIC CO., LTD. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170405 Termination date: 20200919 |
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| CF01 | Termination of patent right due to non-payment of annual fee |