CN206920512U - A kind of power failure detection circuit with low power consumption - Google Patents
A kind of power failure detection circuit with low power consumption Download PDFInfo
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- CN206920512U CN206920512U CN201720856331.4U CN201720856331U CN206920512U CN 206920512 U CN206920512 U CN 206920512U CN 201720856331 U CN201720856331 U CN 201720856331U CN 206920512 U CN206920512 U CN 206920512U
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Abstract
The utility model provides a kind of power failure detection circuit with low power consumption, including resistance R1, diode D1, electric capacity SC1 and microcontroller, the VIN ends of battery connect the IO1 pins of resistance R1 one end, diode D1 anode and microcontroller respectively, the IO2 pins of the other end connection microcontroller of the resistance R1, the negative electrode of the diode D1 connects the VCC pins of microcontroller and electric capacity SC1 positive pole respectively, and the negative pole of the electric capacity SC1 meets GND.The utility model is used for the real-time detection of power loss of battery powered intellectual water meter, intelligent gas meter, intelligent calorimeter or other Internet of Things modules, can effectively reduce power consumption and system cost.
Description
Technical field
It the utility model is related to a kind of detection circuit, more particularly to a kind of power failure detection circuit with low power consumption.
Background technology
With the lifting that China is information-based, intelligent and technicalization is horizontal, intelligent metering technology is in water meter, ammeter, combustion
Application in gas meter, calorimeter is also more and more extensive.China is to intelligent electric meter, intellectual water meter, intelligent gas meter, intelligence at present
Can the research and building-up work of calorimeter progress energetically.With the continuous quickening of power network process of reform, intelligent electric meter in China
Large-scale popularization is obtained, the application of intellectual water meter, gas meter, flow meter and calorimeter is also more and more extensive.
Intellectual water meter, intelligent gas meter, intelligent calorimeter or other Internet of Things modules use battery powered mostly, to two
The leakage current requirement of pole pipe is higher, adds system cost, while the resistance in circuit can produce larger current drain, increase
System power dissipation.
Utility model content
To overcome the deficiencies in the prior art, the utility model provides a kind of power failure detection circuit with low power consumption, can be effective
Reduce power consumption and system cost.
The utility model uses following technical scheme：
A kind of power failure detection circuit with low power consumption, wherein, including resistance R1, diode D1, electric capacity SC1 and microcontroller, electricity
The VIN ends in pond connect the IO1 pins of resistance R1 one end, diode D1 anode and microcontroller respectively, the resistance R1's
The other end connects the IO2 pins of microcontroller, and the negative electrode of the diode D1 connects the VCC pins and electric capacity of microcontroller respectively
SC1 positive pole, the negative pole of the electric capacity SC1 meet GND.
Preferably, the microcontroller is STM8L052 single-chip microcomputers.
Preferably, the electric capacity SC1 is farad capacitor.
The beneficial effects of the utility model are as follows：
The utility model is used for battery powered intellectual water meter, intelligent gas meter, intelligent calorimeter or other Internet of Things
The real-time detection of power loss of module, its terminal potential of resistance two is equal, does not produce current drain, therefore power consumption is compared with the scheme of prior art
Reduce a lot.Further, since resistance is only in loop in very short detection time, reducing resistance will not produce to system power dissipation
Raw considerable influence, short circuit are no longer sensitive to the leakage current of diode, can effectively reduce system cost.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.
Fig. 1 is the circuit theory diagrams of power-fail detection circuit in the prior art.
Fig. 2 is a kind of circuit theory diagrams of power failure detection circuit with low power consumption of the utility model.
Fig. 3 is the connection principle schematic diagram of the utility model microcontroller.
Embodiment
Preferred embodiment of the present utility model is illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein excellent
Select embodiment to be merely to illustrate and explain the utility model, be not used to limit the utility model.
As shown in figure 1, the power-fail detection circuit of prior art, power supply/battery interface VIN is connected to diode D1, simultaneously
GND is connected to by fixed pull down resistor R1, when power down occurs, farad capacitor SC1 is to microcontroller and other circuits
Power supply, diode D1 anti-phase leakage current are consumed by R1, and now IO1 produces a trailing edge, and microcontroller judges to generate
Electric behavior.
Because resistance R1 is always present in circuit, larger current drain can be produced；Although increase resistance R1 can reduce
Current drain, it is possible that being not enough to consume diode D1 leakage current.Therefore, the low-power consumption detection of power loss electricity of prior art
Road is higher to diode D1 leakage current requirement, adds system cost, simultaneously because resistance R1 presence, adds system work(
Consumption.
As shown in Figure 2 and Figure 3, the utility model provides a kind of power failure detection circuit with low power consumption, including resistance R1, diode
D1, electric capacity SC1 and microcontroller, the VIN ends of battery connect resistance R1 one end, diode D1 anode and microcontroller respectively
IO1 pins, the IO2 pins of the other end connection microcontroller of the resistance R1, the negative electrode of the diode D1 connects respectively
The VCC pins of microcontroller and electric capacity SC1 positive pole, the negative pole of the electric capacity SC1 meet GND.Microcontroller is that STM8L052 is mono-
Piece machine, electric capacity SC1 are farad capacitor.
Power supply/battery interface VIN is connected to diode D1, while the IO2 pins of microcontroller are connected to by resistance R1.
Under normal condition, the IO2 pins output high level of microcontroller, the terminal potentials of resistance R1 two are equal, do not consume extra electric current.It is micro-
IO2 is periodically exported low level by controller, if now power down, resistance R1 can consume diode D1 leakage current
Fall, now IO1 can detect low level, and then judge that there occurs low electric behavior.
Because under usual state, the terminal potentials of resistance R1 two are equal, current drain is not produced, therefore power consumption is compared with prior art
Power-fail detection circuit reduces a lot.Further, since only in very short detection time (3us) is in loop resistance R1, reduce
Resistance R1 will not produce considerable influence to system power dissipation, that is to say, that short circuit is no longer sensitive to diode D1 leakage current, can be with
Effectively reduce system cost.
The utility model is applied to battery powered intellectual water meter, intelligent gas meter, intelligent calorimeter or other Internet of Things
Net module, in real time monitor battery/power source input whether be unplugged (detection of power loss), can effectively reduce power consumption and system into
This.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (3)
- A kind of 1. power failure detection circuit with low power consumption, it is characterised in that：Including resistance R1, diode D1, electric capacity SC1 and microcontroller Device, the VIN ends of battery connect the IO1 pins of resistance R1 one end, diode D1 anode and microcontroller, the resistance respectively The IO2 pins of R1 other end connection microcontroller, the negative electrode of the diode D1 connect respectively microcontroller VCC pins and Electric capacity SC1 positive pole, the negative pole of the electric capacity SC1 meet GND.
- 2. power failure detection circuit with low power consumption according to claim 1, it is characterised in that：The microcontroller is STM8L052 Single-chip microcomputer.
- 3. power failure detection circuit with low power consumption according to claim 1, it is characterised in that：The electric capacity SC1 is farad capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720856331.4U CN206920512U (en) | 2017-07-14 | 2017-07-14 | A kind of power failure detection circuit with low power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720856331.4U CN206920512U (en) | 2017-07-14 | 2017-07-14 | A kind of power failure detection circuit with low power consumption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206920512U true CN206920512U (en) | 2018-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720856331.4U Active CN206920512U (en) | 2017-07-14 | 2017-07-14 | A kind of power failure detection circuit with low power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164115A (en) * | 2019-06-05 | 2019-08-23 | 河南卓正电子科技有限公司 | A kind of multi-mode Internet of Things wisdom energy source data acquisition terminal |
-
2017
- 2017-07-14 CN CN201720856331.4U patent/CN206920512U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164115A (en) * | 2019-06-05 | 2019-08-23 | 河南卓正电子科技有限公司 | A kind of multi-mode Internet of Things wisdom energy source data acquisition terminal |
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