CN107658942A - Power supply circuit and intelligent electric meter based on RTC - Google Patents
Power supply circuit and intelligent electric meter based on RTC Download PDFInfo
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- CN107658942A CN107658942A CN201711029408.1A CN201711029408A CN107658942A CN 107658942 A CN107658942 A CN 107658942A CN 201711029408 A CN201711029408 A CN 201711029408A CN 107658942 A CN107658942 A CN 107658942A
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- rtc
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- resistance
- booster circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 230000005611 electricity Effects 0.000 claims description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229910018095 Ni-MH Inorganic materials 0.000 claims description 2
- 229910018477 Ni—MH Inorganic materials 0.000 claims description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000005779 cell damage Effects 0.000 description 2
- 208000037887 cell injury Diseases 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- H02J2007/0067—
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides the power supply circuit based on RTC and intelligent electric meter, including：When super capacitor C1 voltage is less than predeterminated voltage, booster circuit enters boost mode, by using boost chip, it is ensured that clock chip RTC normal work.
Description
Technical field
The present invention relates to intelligent electric meter technical field, more particularly, to power supply circuit and intelligent electric meter based on RTC.
Background technology
At present, intelligent electric meter is by external battery, when cell damage or after more than service life, can not open ammeter
In the case of lead sealing, battery is changed in outside.Before new battery is inserted, if used batteries have been damaged or owed
Pressure, causes ammeter out of power, then needs the super capacitor inside intelligent electric meter to maintain power supply, so as to ensure the accurate of intelligent electric meter
Property.
But due to super capacitor by capacity, self discharge, RTC (Real-time clock, clock chip) power consumption and
The influence of the factors such as environment temperature, very high requirement is proposed to the power supply mode of super capacitor.Especially under the high temperature conditions,
The situation less than 2V occurs in measurement super capacitor both end voltage, and deviation occurs in clock chip RTC, and this explanation works as super capacitor
Voltage less than RTC operating voltage after, clock chip RTC does not just work.
To sum up, because super capacitor is influenceed by hot environment factor, self discharge is too fast at high temperature, keeps voltage capability
Difference, it is impossible to ensure clock chip RTC normal work.
The content of the invention
In view of this, it is an object of the invention to provide the power supply circuit based on RTC and intelligent electric meter, by using boosting
Chip, it is ensured that clock chip RTC normal work.
In a first aspect, the embodiments of the invention provide the power supply circuit based on RTC, the circuit includes：Diode D2's
Anode inputs first voltage, the negative electrode of the diode D2 negative electrode with diode D3, electric capacity C2 one end, resistance R3 respectively
One end is connected with inductance L1 one end, the anode of the diode D3 negative electrode with diode D1, resistance R1 one end respectively
Be connected with resistance R2 one end, the anode of diode D1 input second voltage, the other end of the resistance R1 respectively with
The other end of the resistance R2 is connected with super capacitor C1 one end, the other end of the super capacitor C1 respectively with the electricity
The other end for holding C2 is connected with electric capacity C3 one end, and is grounded；
The other end of the resistance R3 is connected with the pin 1 of booster circuit, the other end and the liter of the inductance L1
The pin 2 of volt circuit is connected, and the other end of the electric capacity C3 is connected with the pin 1 of the booster circuit, the boosting electricity
The pin 6 on road is connected with electric capacity C4 one end and resistance R4 one end respectively, and is grounded, the other end of the electric capacity C4 with
The pin 5 of the booster circuit is connected, and the other end of the resistance R4 is connected with the pin 4 of the booster circuit；
When the voltage of the super capacitor C1 is less than predeterminated voltage, the booster circuit enters boost mode.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the first of first aspect, wherein, institute
The pin 3 for stating booster circuit is input voltage VIN, and the pin 1 of the booster circuit is output voltage VMIAN, when
When the input voltage VIN is more than the predeterminated voltage, clock chip RTC is in pass-through state, and the clock chip RTC's is defeated
It is the input voltage VIN to go out voltage.
With reference to the first possible embodiment of first aspect, the embodiments of the invention provide second of first aspect
Possible embodiment, wherein, when the input voltage VIN is less than the output voltage VMIAN, the booster circuit is carried out
Boosting, so that the output voltage of the clock chip RTC is the output voltage VMIAN.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the third of first aspect, wherein, when
During mains-supplied, there is provided the second voltage, the second voltage are clock chip RTC power supplies, and by resistance R1 and
Resistance R2 charges for the super capacitor C1.
With reference to the third possible embodiment of first aspect, the embodiments of the invention provide the 4th of first aspect kind
Possible embodiment, wherein, when the civil power is without power supply, lithium battery provides the first voltage, first electricity
Pressure is powered by the diode D2 for the clock chip RTC.
With reference to the 4th kind of possible embodiment of first aspect, the embodiments of the invention provide the 5th of first aspect kind
Possible embodiment, wherein, when the civil power and the lithium battery are without power supply, and the voltage of the super capacitor C1
During more than the predeterminated voltage, the super capacitor C1 is powered by the diode D3 for the clock chip RTC.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 6th of first aspect kind, wherein, institute
It is TPS61098 to state booster circuit.
With reference to the 6th kind of possible embodiment of first aspect, the embodiments of the invention provide the 7th of first aspect kind
Possible embodiment, wherein, the TPS61098 includes single-unit alkaline battery, binodal alkaline battery, nickel-cadmium cell, ni-mh electricity
One or more in pond, single-unit button cell, single-unit lithium ion battery and lithium polymer battery.
With reference in a first aspect, the embodiments of the invention provide the possible embodiment of the 8th of first aspect kind, wherein, institute
It is 2.2V to state predeterminated voltage.
Second aspect, the embodiment of the present invention also provide intelligent electric meter, including the power supply circuit based on RTC as described above.
The embodiments of the invention provide the power supply circuit based on RTC and intelligent electric meter, including：Diode D2 anode input
First voltage, diode D2 the negative electrode negative electrode with diode D3, electric capacity C2 one end, resistance R3 one end and inductance L1 respectively
One end be connected, one end phase of diode D3 the anode negative electrode with diode D1, resistance R1 one end and resistance R2 respectively
Connection, diode D1 anode input second voltage, the resistance R1 other end other end and super capacitor with resistance R2 respectively
C1 one end is connected, and the super capacitor C1 other end is connected with the electric capacity C2 other end and electric capacity C3 one end respectively, and
And it is grounded；The resistance R3 other end is connected with the pin 1 of booster circuit, the inductance L1 other end and the pin 2 of booster circuit
Be connected, the electric capacity C3 other end is connected with the pin 1 of booster circuit, the pin 6 of booster circuit respectively with electric capacity C4 one
End is connected with resistance R4 one end, and is grounded, and the electric capacity C4 other end is connected with the pin 5 of booster circuit, resistance R4
The other end be connected with the pin 4 of booster circuit；When super capacitor C1 voltage is less than predeterminated voltage, booster circuit enters
Boost mode, by using boost chip, it is ensured that clock chip RTC normal work.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and obtained in accompanying drawing.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the power supply circuit schematic diagram based on RTC that the embodiment of the present invention one provides；
Fig. 2 is the boost conversion efficiency and output current relation schematic diagram that the embodiment of the present invention one provides；
Fig. 3 is the output voltage of the offer of the embodiment of the present invention one with load change schematic diagram；
Fig. 4 is the output voltage waveforms schematic diagram that the embodiment of the present invention two provides；
Fig. 5 is the output voltage of the offer of the embodiment of the present invention two with change range of input voltage schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Technical scheme be clearly and completely described, it is clear that described embodiment is part of the embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
At present, intelligent electric meter is by external battery, when cell damage or after more than service life, can not open ammeter
In the case of lead sealing, battery is changed in outside.Before new battery is inserted, if used batteries have been damaged or owed
Pressure, causes ammeter out of power, then needs the super capacitor inside intelligent electric meter to maintain power supply, so as to ensure the accurate of intelligent electric meter
Property.
But due to super capacitor by capacity, self discharge, RTC (Real-time clock, clock chip) power consumption and
The influence of the factors such as environment temperature, very high requirement is proposed to the power supply mode of super capacitor.Especially under the high temperature conditions,
The situation less than 2V occurs in measurement super capacitor both end voltage, and deviation occurs in clock chip RTC, and this explanation works as super capacitor
Voltage less than RTC operating voltage after, clock chip RTC does not just work.
When civil power and lithium battery are without power supply, super capacitor may insure clock chip RTC in following three kinds of rings
Clock accuracy at a temperature of border, it is specially：After normal temperature 25 degree 7 days, RTC clock accuracy error is less than 5 seconds；After high temperature 70 degree 2 days,
RTC clock accuracy error is less than 5 seconds；After low temperature -40 spends 2 days, RTC clock accuracy error is less than 5 seconds.
It follows that super capacitor under normal temperature and low temperature environment, influences smaller；But at high temperature, due to internal resistance liter
Height, capacity decline to a great extent, and self discharge is larger, so that clock chip RTC voltage fall also increases therewith.
Clock chip RTC operating voltage range is 2V~5.5V；Normal temperature operating current about 5uA, 70 degree of high temperature are
10uA.The charging voltage of super capacitor is 4V, the pressure drop for subtracting diode is about 3.6V.
After high temperature 48 hours, measurement super capacitor both end voltage can occur the situation less than 2V, check clock for test
Chip RTC, discovery have discrete quantities deviation some to be more than a few minutes, the phenomenon of several hours.Illustrate that super-capacitor voltage is less than
After RTC operating voltage, RTC does not work.
To sum up, because super capacitor is influenceed by hot environment factor, self discharge is too fast at high temperature, keeps voltage capability
Difference, it is impossible to ensure clock chip RTC normal work.
Therefore, the application uses the boost chip of low-power consumption, even if the voltage of super capacitor is less than clock chip RTC work
Make voltage, also ensure that clock chip RTC normal work.
For ease of understanding the present embodiment, the embodiment of the present invention is described in detail below.
Embodiment one：
Fig. 1 is the power supply circuit schematic diagram provided in an embodiment of the present invention based on RTC.
Reference picture 1, the circuit include：
Diode D2 anode input first voltage, the negative electrode of the diode D2 negative electrode with diode D3, electricity respectively
One end, the resistance R3 one end for holding C2 are connected with inductance L1 one end, diode D3 anode the moon with diode D1 respectively
Pole, resistance R1 one end are connected with resistance R2 one end, diode D1 anode input second voltage, the resistance R1 other end
It is connected respectively with the resistance R2 other end and super capacitor C1 one end, the super capacitor C1 other end is respectively with electric capacity C2's
The other end is connected with electric capacity C3 one end, and is grounded；
The resistance R3 other end is connected with the pin 1 of booster circuit, the inductance L1 other end and the pin 2 of booster circuit
Be connected, the electric capacity C3 other end is connected with the pin 1 of booster circuit, the pin 6 of booster circuit respectively with electric capacity C4 one
End is connected with resistance R4 one end, and is grounded, and the electric capacity C4 other end is connected with the pin 5 of booster circuit, resistance R4
The other end be connected with the pin 4 of booster circuit；
When super capacitor C1 voltage is less than predeterminated voltage, booster circuit enters boost mode.
Here, predeterminated voltage 2.2V.
When super capacitor C1 voltage is less than predeterminated voltage, booster circuit enters boost mode, by output voltage stabilizing extremely
2.2V, so as to ensure that when the voltage of super capacitor is less than clock chip RTC minimum, clock chip RTC
It is 2.2V that VRTC voltages, which can be ensured, the minimum more than VRTC, makes clock chip RTC normal works.
Further, the pin 3 of booster circuit is input voltage VIN, and the pin 1 of booster circuit is output voltage
VMIAN, when input voltage VIN is more than predeterminated voltage, clock chip RTC is in pass-through state, clock chip RTC output electricity
Press as input voltage VIN.
Here, booster circuit TPS61098.TPS61098 includes single-unit alkaline battery, binodal alkaline battery, NI-G electricity
One or more in pond, Ni-MH battery, single-unit button cell, single-unit lithium ion battery and lithium polymer battery.
Specifically, the input voltage using VRTC_IN as U1 (TPS61098), L1 size determine output voltage
VMIAN (VRTC) size.
It is 2.2V to set VMIAN (VRTC) herein, and pin 4 (MODE) connects drop-down, booster circuit is in low power consumpting state
(RTC operating currents are smaller, and -40~70 degree of operated within range electric currents of degree are less than 10uA), due to need not be with heavy load, so drawing
Pin 5 (VSUB) can be hanging, and it is to improve anti-interference that C4 is held in power-up here.
Further, when input voltage VIN is less than output voltage VMIAN, booster circuit is boosted, so that clock core
Piece RTC output voltage is output voltage VMIAN.
Further, when mains-supplied, there is provided second voltage, second voltage is powered for clock chip RTC, and passes through electricity
R1 and resistance R2 is hindered to charge for super capacitor C1.
Further, when civil power is without power supply, lithium battery provides first voltage, and first voltage is by diode D2
Clock chip RTC powers.
Here, when civil power is powered, or civil power is without power supply, electric due to inputting when lithium battery is powered
Pressure VRTC_IN be more than 2.2V, now booster circuit is operated in pass-through state, and input voltage is much, output voltage just have it is much, it is several
It is not lost, conversion efficiency is close to 100%.
Specifically, with reference to boost conversion efficiency as shown in Figure 2 and output current relation schematic diagram, in figure (a) and figure (b)
In, when electric current is 10uA, boost conversion efficiency is between 82%-90%.
With reference to output voltage as shown in Figure 3 with load change schematic diagram, in the current range of RTC work, output electricity
Press as 2.3V, holding stabilization.
It follows that in boosting, although have lost some conversion efficiencies, output voltage loads electricity in 5~10uA
In the range of stream, 2.3V is but maintained always, ensure that the work of RTC normal tables.
Further, when civil power and lithium battery are without power supply, and super capacitor C1 voltage is more than predeterminated voltage,
Super capacitor C1 is powered by diode D3 for clock chip RTC.
Intelligent electric meter includes the power supply circuit based on RTC as described above.
The embodiments of the invention provide the power supply circuit based on RTC and intelligent electric meter, including：Diode D2 anode input
First voltage, diode D2 the negative electrode negative electrode with diode D3, electric capacity C2 one end, resistance R3 one end and inductance L1 respectively
One end be connected, one end phase of diode D3 the anode negative electrode with diode D1, resistance R1 one end and resistance R2 respectively
Connection, diode D1 anode input second voltage, the resistance R1 other end other end and super capacitor with resistance R2 respectively
C1 one end is connected, and the super capacitor C1 other end is connected with the electric capacity C2 other end and electric capacity C3 one end respectively, and
And it is grounded；The resistance R3 other end is connected with the pin 1 of booster circuit, the inductance L1 other end and the pin 2 of booster circuit
Be connected, the electric capacity C3 other end is connected with the pin 1 of booster circuit, the pin 6 of booster circuit respectively with electric capacity C4 one
End is connected with resistance R4 one end, and is grounded, and the electric capacity C4 other end is connected with the pin 5 of booster circuit, resistance R4
The other end be connected with the pin 4 of booster circuit；When super capacitor C1 voltage is less than predeterminated voltage, booster circuit enters
Boost mode, by using boost chip, it is ensured that clock chip RTC normal work.
Embodiment two：
Fig. 4 is the output voltage waveforms schematic diagram that the embodiment of the present invention two provides.
Reference picture 4, output voltage is more stable, and voltage pulsation is less than 10mV.
Fig. 5 is the output voltage of the offer of the embodiment of the present invention two with change range of input voltage schematic diagram.
Reference picture 5, under low-power consumption mode, output voltage with input voltage change as shown in the figure.
The computer program product that the embodiment of the present invention is provided, including store the computer-readable storage of program code
Medium, the instruction that described program code includes can be used for performing the method described in previous methods embodiment, and specific implementation can be joined
See embodiment of the method, will not be repeated here.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
With the specific work process of device, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In addition, in the description of the embodiment of the present invention, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
If the function is realized in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are causing a computer equipment (can be
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
Finally it should be noted that：Embodiment described above, it is only the embodiment of the present invention, to illustrate the present invention
Technical scheme, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those within the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify to the technical scheme described in previous embodiment or can be light
Change is readily conceivable that, or equivalent substitution is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of technical scheme of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
1. a kind of power supply circuit based on RTC, it is characterised in that the circuit includes：The diode D2 electricity of anode input first
Pressure, the negative electrode of the diode D2 negative electrode with diode D3, electric capacity C2 one end, resistance R3 one end and inductance L1 respectively
One end is connected, one end of the anode of the diode D3 negative electrode with diode D1, resistance R1 one end and resistance R2 respectively
It is connected, the anode of the diode D1 inputs second voltage, and the other end of the resistance R1 is another with the resistance R2 respectively
One end is connected with super capacitor C1 one end, the other end of the super capacitor C1 respectively with the other end of the electric capacity C2 and
Electric capacity C3 one end is connected, and is grounded；
The other end of the resistance R3 is connected with the pin 1 of booster circuit, the other end of the inductance L1 and the boosting electricity
The pin 2 on road is connected, and the other end of the electric capacity C3 is connected with the pin 1 of the booster circuit, the booster circuit
Pin 6 is connected with electric capacity C4 one end and resistance R4 one end respectively, and is grounded, the other end of the electric capacity C4 with it is described
The pin 5 of booster circuit is connected, and the other end of the resistance R4 is connected with the pin 4 of the booster circuit；
When the voltage of the super capacitor C1 is less than predeterminated voltage, the booster circuit enters boost mode.
2. the power supply circuit according to claim 1 based on RTC, it is characterised in that the pin 3 of the booster circuit
For input voltage VIN, the pin 1 of the booster circuit is output voltage VMIAN, when the input voltage VIN is more than institute
When stating predeterminated voltage, clock chip RTC is in pass-through state, and the output voltage of the clock chip RTC is the input voltage
VIN。
3. the power supply circuit according to claim 2 based on RTC, it is characterised in that when the input voltage VIN is less than institute
When stating output voltage VMIAN, the booster circuit is boosted, so that the output voltage of the clock chip RTC is described defeated
Go out voltage VMIAN.
4. the power supply circuit according to claim 1 based on RTC, it is characterised in that when mains-supplied, there is provided described
Two voltages, the second voltage are powered for the clock chip RTC, and are the super capacitor C1 by resistance R1 and resistance R2
Charging.
5. the power supply circuit according to claim 4 based on RTC, it is characterised in that when the civil power is without power supply,
Lithium battery provides the first voltage, and the first voltage is powered by the diode D2 for the clock chip RTC.
6. the power supply circuit according to claim 5 based on RTC, it is characterised in that when the civil power and the lithium battery
Without power supply, and when the voltage of the super capacitor C1 is more than the predeterminated voltage, the super capacitor C1 passes through described
Diode D3 powers for the clock chip RTC.
7. the power supply circuit according to claim 1 based on RTC, it is characterised in that the booster circuit is TPS61098.
8. the power supply circuit according to claim 7 based on RTC, it is characterised in that the TPS61098 includes single-unit alkali
Property battery, binodal alkaline battery, nickel-cadmium cell, Ni-MH battery, single-unit button cell, single-unit lithium ion battery and lighium polymer electricity
One or more in pond.
9. the power supply circuit according to claim 1 based on RTC, it is characterised in that the predeterminated voltage is 2.2V.
A kind of 10. intelligent electric meter, it is characterised in that including described in claim 1 to any one of claim 9 based on RTC's
Power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029408.1A CN107658942A (en) | 2017-10-27 | 2017-10-27 | Power supply circuit and intelligent electric meter based on RTC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029408.1A CN107658942A (en) | 2017-10-27 | 2017-10-27 | Power supply circuit and intelligent electric meter based on RTC |
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| Publication Number | Publication Date |
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| CN107658942A true CN107658942A (en) | 2018-02-02 |
Family
ID=61095955
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711029408.1A Pending CN107658942A (en) | 2017-10-27 | 2017-10-27 | Power supply circuit and intelligent electric meter based on RTC |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429332A (en) * | 2018-05-18 | 2018-08-21 | 扬州万泰电子科技有限公司 | A kind of super capacitor application circuit of battery changeable type intelligent electric energy meter power supply |
| CN110632420A (en) * | 2019-09-20 | 2019-12-31 | 广州鲁邦通物联网科技有限公司 | RTC (real time clock) module testing method and device and multi-module automatic testing method and device for Android equipment production |
| WO2021194719A1 (en) * | 2020-03-26 | 2021-09-30 | Landis+Gyr Innovations, Inc. | Utility meter with solar-powered real-time clock |
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| CN204359861U (en) * | 2014-12-31 | 2015-05-27 | 潍坊五洲浩特电气有限公司 | The real-time clock power circuit of intelligent electric meter and be provided with the intelligent electric meter of this circuit |
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| CN108429332A (en) * | 2018-05-18 | 2018-08-21 | 扬州万泰电子科技有限公司 | A kind of super capacitor application circuit of battery changeable type intelligent electric energy meter power supply |
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| CN110632420A (en) * | 2019-09-20 | 2019-12-31 | 广州鲁邦通物联网科技有限公司 | RTC (real time clock) module testing method and device and multi-module automatic testing method and device for Android equipment production |
| CN110632420B (en) * | 2019-09-20 | 2021-06-22 | 广州鲁邦通物联网科技有限公司 | RTC (real time clock) module testing method and device and multi-module automatic testing method and device for Android equipment production |
| WO2021194719A1 (en) * | 2020-03-26 | 2021-09-30 | Landis+Gyr Innovations, Inc. | Utility meter with solar-powered real-time clock |
| US11309727B2 (en) | 2020-03-26 | 2022-04-19 | Landis+Gyr Innovations, Inc. | Utility meter with solar-powered real-time clock |
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