CN206524664U - A kind of small power electric source control circuit - Google Patents
A kind of small power electric source control circuit Download PDFInfo
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- CN206524664U CN206524664U CN201720271275.8U CN201720271275U CN206524664U CN 206524664 U CN206524664 U CN 206524664U CN 201720271275 U CN201720271275 U CN 201720271275U CN 206524664 U CN206524664 U CN 206524664U
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Abstract
The utility model discloses a kind of small power electric source control circuit, including：Current Voltage regulation circuit, charge power supply, power-fail detection circuit, power down switching circuit, switch, the input of the Current Voltage regulation circuit receive input power signal, and the output end of the Current Voltage regulation circuit is connected with the positive pole of the charge power supply；The positive pole of the charge power supply is also connected by the switch with external electrical network terminal, the negative pole ground connection of the charge power supply；The first input end of the power-fail detection circuit receives line voltage, and the second input connection voltage-reference of the power-fail detection circuit, the output end of the power-fail detection circuit is connected with the first input end of the power down switching circuit；Second input of the power down switching circuit is connected with the micro-control unit MCU of electric network terminal, and the output end of the power down switching circuit is connected with the switch.
Description
Technical field
The utility model is related to meter power technique fields, more particularly to a kind of small power electric source control circuit.
Background technology
The establishing criteria requirement in electric power meter terminal device, is required for being equipped with low-power battery, to realize in terminal master
During power failure, system can also normal work certain time.Due to meter terminal device small volume, inner space is limited, at present
The accessory power supply of use is mainly low capacity lithium battery, Ni-MH battery and farad capacitor etc..These power supplys are all dc sources,
Need to carry out management of charging and discharging during use, if miscarriage will cause the reduction of its service life and performance, so that shadow
Ring whole product.At the same time, battery will be quickly switched into power supply state after terminal device monitors civil power power down, if
It timely and effective can not switch, loss of data will be caused abnormal, therefore to accomplish seamless switching.
At present, accessory power supply mainly uses lithium battery, Ni-MH battery, on a small quantity using farad capacitor, main in terms of battery management
To be managed using special chip.What is commonly used at present in terms of switching is switched over by terminal monitoring city electricity condition.
Its function of power supply management of charging and discharging special chip is relatively simple, the battery of specific voltage can only be managed, example
Such as the CN3052B that such as rhythm electronics is produced, its output voltage is 4.2V, and maximum constant-current charge electric current is 180mA.For similar side
Case, casts aside cost, if it is desired that with during the battery of other models, it is necessary to carry out corresponding chip replacing and circuit design, to opening
Hair is made troubles with handling of goods and materials.
The mode that current civil power power down switching is used is detects line voltage by MCU, if voltage drops to setting
Threshold voltage is to judge civil power power down, and now MCU sends the battery powered signal of control, realizes that civil power is cut to battery powered
Change.Which needs the voltage detecting amount of the continuous calculating simulation inputs of MCU, is compared by software engineering and is judged, not only
Need to take system time, and react relative delay.
Current existing technology mainly completes battery management by charging management chip, such as 4.2V, 5.5V, 3.6V
Fixed voltage, existing charging current scope also relative narrower, for that can have certain limitation with the battery of quick charge.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the present utility model, and
It is not construed as recognizing or implies that the information structure has been existing well known to persons skilled in the art in any form
Technology.
Utility model content
The purpose of this utility model is a kind of method switched over when providing power source charges management with civil power power down, from
And overcome charging voltage in the prior art and charging current scope is narrower and power down switching time is longer technical problem.
To achieve the above object, the utility model provides a kind of small power electric source control circuit, including：Current Voltage is adjusted
Economize on electricity road, charge power supply, power-fail detection circuit, power down switching circuit, switch, the input termination of the Current Voltage regulation circuit
Input power signal is received, the output end of the Current Voltage regulation circuit is connected with the positive pole of the charge power supply；The charging
The positive pole of power supply is also connected by the switch with external electrical network terminal, the negative pole ground connection of the charge power supply；The power down inspection
The first input end of slowdown monitoring circuit receives line voltage, the second input connection voltage-reference of the power-fail detection circuit, institute
The output end for stating power-fail detection circuit is connected with the first input end of the power down switching circuit；The of the power down switching circuit
Two inputs are connected with the micro-control unit MCU of electric network terminal, and the output end of the power down switching circuit is connected with the switch.
Preferably, in above-mentioned technical proposal, the Current Voltage regulation circuit includes：Resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R5, resistance R6, triode Q1, voltage adjuster U7, voltage adjuster U8, the first end of the resistance R1, institute
The colelctor electrode for stating triode Q1 receives input power signal respectively；The second end of the resistance R1, the base stage of the triode Q1,
The negative electrode of the voltage adjuster U7, the negative electrode of the voltage adjuster U8 are respectively connected with；The emitter stage of the triode Q1 with
The first end of the resistance R5, the first end of the resistance R6, the reference pole of the voltage adjuster U7 are respectively connected with；The electricity
Resistance R5 the second end, the second end of the resistance R6, the anode of the voltage adjuster U7, the first end difference of the resistance R4
It is connected with the positive pole of the charge power supply；The second end of the resistance R4 is connected with the first end of the resistance R3, the resistance
R3 the second end, the reference pole of the voltage adjuster U8, the first end of the resistance R2 are respectively connected with；The of the resistance R2
Two ends, the anode of the voltage adjuster U8 are grounded respectively.
Preferably, in above-mentioned technical proposal, the power down switching circuit includes：Triode Q2, triode Q3, triode
Q4, the base stage of the triode Q2 is connected with the output end of the power-fail detection circuit, the colelctor electrode of the triode Q2 and institute
The emitter stage for stating triode Q3 is connected, and the emitter stage of the triode Q2 is connected with the supply voltage of electric network terminal；Three pole
Pipe Q3 base stage is connected with the micro-control unit MCU of electric network terminal, and the colelctor electrode of the triode Q3 is with the triode Q4's
Base stage is connected；The colelctor electrode of the triode Q4 is connected with the switch, the emitter stage of the triode Q4 and electric network terminal
Ground is connected.
Preferably, in above-mentioned technical proposal, the power-fail detection circuit is comparator.
Preferably, in above-mentioned technical proposal, the voltage adjuster U7, the voltage adjuster U8 are TL431IPK voltages
Adjuster.
Preferably, in above-mentioned technical proposal, the output voltage V of the Current Voltage regulationout=Vref*[1+(R3+R4)/
R2]+Iref*(R3+R4), maximum output current Imax=Vref/R6||R5, wherein, VrefFor reference voltage, IrefFor the defeated of reference edge
Enter electric current.
Preferably, in above-mentioned technical proposal, the charge power supply is lithium battery, Ni-MH battery or farad capacitor.
Compared with prior art, the utility model has the advantages that：Small-power power disclosed in the utility model
Circuit is managed, compared with prior art, with good flexible and changeable property, prior art can only be filled for single battery
Electricity；Electric power management circuit disclosed in the utility model can adjust charging voltage to meet variety classes battery at any time as needed
Charge requirement, and charging current can also be adjusted with battery difference；After civil power power down, being switched to charge power supply is
When terminal is powered, react compared with prior art more rapidly, delay time only with the rising of electronic device pulse signal with
Fall time is relevant, without other interference times, so that power supply switching is relatively reliable.
Brief description of the drawings
Fig. 1 is the principle schematic for carrying out electric network terminal power down switching in the prior art.
Fig. 2 is the principle schematic of small power electric source control circuit of the present utility model.
Fig. 3 is the principle schematic that Current Voltage of the present utility model adjusts circuit 1.
Fig. 4 is the principle schematic of power down switching circuit 4 of the present utility model.
Embodiment
Below in conjunction with the accompanying drawings, embodiment of the present utility model is described in detail, it is to be understood that this practicality
New protection domain is not limited by embodiment.
Explicitly indicated that unless otherwise other, otherwise in entire disclosure and claims, term " comprising " or its change
Change such as "comprising" or " including " etc. and will be understood to comprise stated element or part, and do not exclude other members
Part or other parts.
Scheme has preferable flexibility to the utility model compared with the prior art, and manageable battery voltage range is wide, resonable
Charged by the wide scope that can above realize 2.5V to 36V, its maximum floating charge electric current allowed can reach 1A, while can root
Can be flexible and changeable compared to existing fixed form with on-line control charging voltage and charging current according to being actually needed.Power down switches
Circuit refers to transmission line of electricity in the case of unpredictable, it may appear that region power down is abnormal, in order to ensure in transmission line of electricity power down
Afterwards, end product has the caching phase of a short time, it is desirable to quick seamless handoff is carried out after civil power power down, enables battery for eventually
End power supply ensures that it is reliably exited.The utility model is by circuit realiration civil power detection of power loss and seamless switching, compared to software inspection
Surveying switching has the advantages that fast response time.
As shown in Fig. 2 electric power management circuit of the present utility model, including：Current Voltage regulation circuit 1, charge power supply 2,
Power-fail detection circuit 3, power down switching circuit 4, switch 5, the input of the Current Voltage regulation circuit 1 receive input power letter
Number, the output end of the Current Voltage regulation circuit 1 is connected with the positive pole of the charge power supply 2；The positive pole of the charge power supply 2
Also it is connected by the switch 5 with external electrical network terminal, the negative pole ground connection of the charge power supply；The power-fail detection circuit 3
First input end receives line voltage, the second input connection voltage-reference of the power-fail detection circuit 3, the power down inspection
The output end of slowdown monitoring circuit 3 is connected with the first input end of the power down switching circuit 4；The second of the power down switching circuit 4 is defeated
Enter end with the micro-control unit MCU of electric network terminal to be connected, the output end of the power down switching circuit 4 is connected with the switch.
Current Voltage adjusts circuit 1, and Current Voltage adjusts acting as circuit 1：The DC voltage of input is adjusted to electricity
The charging voltage value that pond allows, while the adjustment of magnitude of voltage can be realized as needed；Many battery such as lithium batteries, Ni-MH battery
The requirement of its charging current if charging current crosses senior general and damages battery, therefore will be limited electric current no more than certain value,
The function of the circuit realizes the different batteries of correspondence, adjusts the charging current value of its permission.
Charge power supply 2, short time function of supplying power is provided when civil power power down occurs in electric network terminal equipment for terminal.It is optional
, the charge power supply 2 is lithium battery, Ni-MH battery or farad capacitor, not limited to this.
Power-fail detection circuit 3, the partial circuit realizes the detection function to civil power power down, according to the line voltage of detection
Value, judge current state whether power down, if judged result be system power failure, send control signal to seamless switching circuit, fall
Power detection circuit 3 can be will not be repeated here, for example, in this practicality using any one power-fail detection circuit in the prior art
New middle power-fail detection circuit 3 uses comparator.
Power down switching circuit 4, the control signal that response power-fail detection circuit 3 is sent, it is power network immediately to enable charge power supply 2
Terminal is powered, and makes the response speed that Microsecond grade is maintained between the switching that electric network terminal powers from mains-supplied to power supply.Also may be used
After system Safe withdrawing, to complete the lower electric control of electric network terminal.
Each circuit in the utility model is described in detail individually below：
As shown in figure 3, the Current Voltage regulation circuit 1 includes：(resistance R1 is pull-up resistor to resistance R1, plays current limliting
Effect), resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, triode Q1, voltage adjuster U7, voltage adjuster
U8, the first end of the resistance R1, the colelctor electrode of the triode Q1 receive input power signal respectively；The of the resistance R1
Two ends, the base stage of the triode Q1, the negative electrode of the voltage adjuster U7, the negative electrode difference phase of the voltage adjuster U8
Even；The first end, the first end of the resistance R6, the voltage adjuster of the emitter stage of the triode Q1 and the resistance R5
U7 reference pole is respectively connected with；The second end of the resistance R5, the second end of the resistance R6, the sun of the voltage adjuster U7
The positive pole of pole, the first end of the resistance R4 respectively with the charge power supply is connected；The second end of the resistance R4 and the electricity
The first end for hindering R3 is connected, the second end of the resistance R3, the reference pole of the voltage adjuster U8, the first of the resistance R2
End is respectively connected with；The second end of the resistance R2, the anode of the voltage adjuster U8 are grounded respectively.
Optionally, the voltage adjuster U7, the voltage adjuster U8 are TL431IPK voltage adjusters.In this practicality
Charging voltage is adjusted new middle use TL431IPK voltage adjusters, and its voltage calculated value exported is true by formula (1)
It is fixed.
Vout=Vref*[1+(R3+R4)/R2]+Iref*(R3+R4) (1)
Wherein, triode Q1 has PID adjustment effects in the utility model, passes through the anti-of TL431IPK voltage adjusters
Feedback input regulation triode Q1 base stage control voltage, so as to be adjusted to charging voltage, Vref=2.5V, VrefFor with reference to electricity
Pressure, Iref=2uA, IrefFor the input current of reference edge, that is, flow through resistance R3, resistance R4Electric current.
Maximum charging current is designed, the feedback reference voltage V that the utility model passes through TL431IPK voltage adjustersref=
2.5V carries out maximum charging current limitation, maximum charging current ImaxCalculation formula such as formula (2) shown in.
Imax=Vref/R6||R5 (2)
As shown in figure 4, power down switching circuit 4 includes：Triode Q2, triode Q3, triode Q4, the triode Q2's
Base stage is connected with the output end of the power-fail detection circuit, the colelctor electrode of the triode Q2 and the emitter stage of the triode Q3
It is connected, (supply voltage refers to electric network terminal powered operation for the emitter stage of the triode Q2 and the supply voltage of electric network terminal
When voltage) be connected；The base stage (by a pull-up resistor) and the micro-control unit MCU phases of electric network terminal of the triode Q3
Even, the colelctor electrode (by a resistance) of the triode Q3 is connected with the base stage of the triode Q4；The triode Q4's
Colelctor electrode is connected with the switch, and the emitter stage of the triode Q4 is connected with the ground of electric network terminal.
In the utility model, power-fail detection circuit 3 can be comparator, and the first input end of comparator receives (processing
Cross) line voltage, the second input connection voltage-reference of comparator, the output end of comparator switches electric with the power down
Triode Q2 base stage is connected in road 4.
The course of work of power down switching circuit 4 is a logic control process, the circuit have two input control signals and
One output control signal.Input signal comes from power-fail detection circuit 3 all the way, and another road is then the MCU hairs by electric network terminal
Go out, output signal is used for the opening and closing of controlling switch 5.In terminal at the beginning of electricity, civil power normal power supply, now detection of power loss
It is the signal that electric network terminal is powered that circuit 3, which sends control charge closing power supply 2, and now triode Q2 ends.Comparator by than
The threshold reference voltage that the line voltage and voltage-reference of relatively input are provided, comparator is in civil power normal work, and it is exported
Signal is high level, and now triode Q2 is in cut-off state；
After MCU initialization, the signal of battery is opened in control, and now triode Q3 is in pre- conducting state, two more than
Individual signal ends with triode Q4 on the basis of operation, and whole logic output disconnects switch 5, and charge power supply 2 does not supply for terminal
Electricity.
After power-fail detection circuit 3 detects civil power power down, sending control signal turns on triode Q2, now coordinates
Triode Q3 conducting, triode Q4 is also switched to conducting state, and whole logic output closes switch 5, and charge power supply 2 is eventually
End power supply.After civil power power down, power down voltage drops to less than threshold reference voltage, and the reversion of comparator output level is compared
Device exports low level, and is input to triode Q2 base stage, and now triode Q2 is in the conduction state.
The MCU of terminal completes the operation such as corresponding active reporting and data preservation after civil power dead electricity is received, it
Whole terminal can just switch to power-off operation afterwards, and shutdown only needs to MCU and sends shutdown signal (MCU when shutting down to triode Q3
Need to send high level to triode Q3 base stage, when triode Q3 base stage and emitter stage are high level, cause three poles
Pipe Q3 is not turned on, and is played a part of charge closing power supply and is powered for electric network terminal), the logic output of whole power down switching circuit 4
By closing switch 5, while charge power supply 2 stops powering for terminal.
Small power electric source control circuit disclosed in the utility model, compared with prior art, with flexible and changeable well
Property, prior art can only be charged for single battery；Electric power management circuit disclosed in the utility model can be as needed
Adjustment charging voltage is to meet the charge requirement of variety classes battery at any time, and charging current can also be carried out with battery difference
Regulation；After civil power power down, when being switched to charge power supply and being powered for terminal, react more rapidly, prolong compared with prior art
When the time only it is relevant with the rise and fall time of electronic device pulse signal, without other interference times, so that power supply
Switching is relatively reliable.
The foregoing description to specific illustrative embodiment of the present utility model be in order to illustrate and illustration purpose.These
Description is not wishing to being defined to the utility model into disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can carry out
It is many to change and change.The purpose of selecting and describing the exemplary embodiment is that explaining certain principles of the present utility model
And its practical application, so that those skilled in the art can realize and utilize a variety of examples of the present utility model
Property embodiment and a variety of selections and change.Scope of the present utility model is intended to by claims and its waits similar shape
Formula is limited.
Claims (7)
1. a kind of electric power management circuit, it is characterised in that including：Current Voltage regulation circuit, charge power supply, detection of power loss electricity
Road, power down switching circuit, switch, the input of the Current Voltage regulation circuit receive input power signal, the electric current electricity
The output end of voltage regulator circuit is connected with the positive pole of the charge power supply；
The positive pole of the charge power supply is also connected by the switch with external electrical network terminal, and the negative pole of the charge power supply connects
Ground；
The first input end of the power-fail detection circuit receives line voltage, the second input connection of the power-fail detection circuit
Voltage-reference, the output end of the power-fail detection circuit is connected with the first input end of the power down switching circuit；
Second input of the power down switching circuit is connected with the micro-control unit MCU of electric network terminal, the power down switching electricity
The output end on road is connected with the switch.
2. electric power management circuit according to claim 1, it is characterised in that the Current Voltage regulation circuit includes：Electricity
Hinder R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, triode Q1, voltage adjuster U7, voltage adjuster U8, institute
State resistance R1 first end, the colelctor electrode of the triode Q1 and receive input power signal respectively；
The second end of the resistance R1, the base stage of the triode Q1, the negative electrode of the voltage adjuster U7, voltage adjustment
Device U8 negative electrode is respectively connected with；
The first end, the first end of the resistance R6, the voltage of the emitter stage of the triode Q1 and the resistance R5 are adjusted
Device U7 reference pole is respectively connected with；
The second end of the resistance R5, the second end of the resistance R6, the anode of the voltage adjuster U7, the resistance R4
Positive pole of the first end respectively with the charge power supply is connected；
The second end of the resistance R4 is connected with the first end of the resistance R3, and the second end of the resistance R3, the voltage are adjusted
Whole device U8 reference pole, the first end of the resistance R2 are respectively connected with；
The second end of the resistance R2, the anode of the voltage adjuster U8 are grounded respectively.
3. electric power management circuit according to claim 1, it is characterised in that the power down switching circuit includes：Triode
Q2, triode Q3, triode Q4, the base stage of the triode Q2 are connected with the output end of the power-fail detection circuit, and described three
Pole pipe Q2 colelctor electrode is connected with the emitter stage of the triode Q3, the power supply of the emitter stage and electric network terminal of the triode Q2
Voltage is connected；
The base stage of the triode Q3 is connected with the micro-control unit MCU of electric network terminal, the colelctor electrode of the triode Q3 and institute
The base stage for stating triode Q4 is connected；
The colelctor electrode of the triode Q4 is connected with the switch, the emitter stage of the triode Q4 and the ground phase of electric network terminal
Even.
4. electric power management circuit according to claim 1, it is characterised in that the power-fail detection circuit is comparator.
5. electric power management circuit according to claim 2, it is characterised in that the voltage adjuster U7, the voltage are adjusted
Whole device U8 is TL431IPK voltage adjusters.
6. electric power management circuit according to claim 2, it is characterised in that the output electricity of the Current Voltage regulation circuit
Press Vout=Vref*[1+(R3+R4)/R2]+Iref*(R3+R4), maximum output current Imax=Vref/R6||R5, wherein, VrefFor ginseng
Examine voltage, IrefFor the input current of reference edge.
7. electric power management circuit according to claim 1, it is characterised in that the charge power supply is lithium battery, ni-mh electricity
Pond or farad capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720271275.8U CN206524664U (en) | 2017-03-20 | 2017-03-20 | A kind of small power electric source control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720271275.8U CN206524664U (en) | 2017-03-20 | 2017-03-20 | A kind of small power electric source control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206524664U true CN206524664U (en) | 2017-09-26 |
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ID=59902971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720271275.8U Active CN206524664U (en) | 2017-03-20 | 2017-03-20 | A kind of small power electric source control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181738A (en) * | 2020-01-20 | 2020-05-19 | 深圳市普威技术有限公司 | POE power supply equipment and system |
| CN113325321A (en) * | 2021-07-02 | 2021-08-31 | 阳光电源股份有限公司 | Energy storage system floating charge state battery power failure detection method and energy storage system |
-
2017
- 2017-03-20 CN CN201720271275.8U patent/CN206524664U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181738A (en) * | 2020-01-20 | 2020-05-19 | 深圳市普威技术有限公司 | POE power supply equipment and system |
| CN111181738B (en) * | 2020-01-20 | 2021-11-23 | 深圳市普威技术有限公司 | POE power supply equipment and system |
| CN113325321A (en) * | 2021-07-02 | 2021-08-31 | 阳光电源股份有限公司 | Energy storage system floating charge state battery power failure detection method and energy storage system |
| CN113325321B (en) * | 2021-07-02 | 2024-05-14 | 阳光电源股份有限公司 | Energy storage system floating state battery power failure detection method and energy storage system |
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