CN205377417U - Electric power meter reading is back -up source for concentrator - Google Patents
Electric power meter reading is back -up source for concentrator Download PDFInfo
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- CN205377417U CN205377417U CN201521059153.XU CN201521059153U CN205377417U CN 205377417 U CN205377417 U CN 205377417U CN 201521059153 U CN201521059153 U CN 201521059153U CN 205377417 U CN205377417 U CN 205377417U
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Abstract
The utility model discloses an electric power meter reading is back -up source for concentrator circuit, including main power source, MCU, super capacitor group, one -way current -limiting circuit, voltage acquisition circuit, switching circuit. One -way current -limiting circuit connects to be located between main power source and the super capacitor group, voltage acquisition circuit connects and locates super capacitor group with between the MCU, the switching circuit connects to be established between super capacitor group and the MCU. Electric power meter reading is back -up source for concentrator adopt the technical scheme of super capacitor group, need not additionally to design the charge management circuit, simplified hardware design, and longe -lived, the charge -discharge number of times is many, fill the discharge time weak point, no memory effect, temperature range extend.
Description
Technical field
This utility model relates to Electric Measurement Technology field, and more particularly it, relate to a kind of electricity meter-reading concentrator back-up source, particularly relate to a kind of back-up source applying super capacitor group.
Background technology
Electricity meter-reading concentrator is as the on-the-spot power information harvester in power information acquisition system, it is necessary to can collect various running status accurately and in time, including, under alternating voltage power-off condition, information being informed long-distance management system in time.Therefore electricity meter-reading concentrator must possess backup power supply, and traditional back-up source is generally aneroid battery or rechargeable battery.This scheme has several big shortcoming: cost is high, and single battery is RMB more than 3 yuan at least；Charging interval length, life-span are short；When frequently having a power failure and power failure duration is little, availability is low；Needing design specialized charge management circuit, both having added cost also increases circuit complexity.
Summary of the invention
For the deficiencies in the prior art part, this utility model provides a kind of electricity meter-reading concentrator back-up source, including MCU, power transfer module, super capacitor group, Unidirectional flow-limiting circuit, voltage collection circuit, switching circuit；Described power transfer module, is connected with main power source, for, under main power source electric power thus supplied, providing working power for described MCU；
Described Unidirectional flow-limiting circuit is arranged between described main power source and super capacitor group, for charging to described super capacitor group with current limit；
Described voltage collection circuit is arranged between described super capacitor group and MCU, for gathering super capacitor group both end voltage and exporting the AD conversion interface to MCU；
Described switching circuit is connected between described super capacitor group and MCU, for according to the described MCU control signal exported, switching on or off the described super capacitor group supply access to external loading.
As preferably, described switching circuit accesses described super capacitor group, and includes: the first switching device, receives the control signal of described MCU, late-class circuit causes break-make control further；Pull-up device, connects described first switching device, with the first voltage increase its break-make drawn or decay to the second voltage；Second switch device, the voltage difference according to the first described voltage and the second voltage, switch on or off the described super capacitor group supply access to external loading.
As preferably, described second switch device is MOS switch.
As preferably, the drain D of described MOS switch, as power output end, is connected with external loading and described main power source simultaneously.
As preferably, between described external loading and described power output end, being equipped with DC-DC module, to provide external loading required voltage.
As preferably, described super capacitor group is made up of super capacitor and multiple resistance in parallel respectively with described super capacitor of multiple series connection.
As preferably, the model of described super capacitor group is 8F/2.7V.
As preferably, also including the working power being connected with described main power source, for when main power source power-off, providing running voltage for described MCU.
This utility model one electricity meter-reading concentrator back-up source adopts the design of super capacitor group, it is not necessary to additional designs charge management circuit, simplifies hardware designs；Super capacitor have the advantage that compared with battery extra long life, discharge and recharge often, the discharge and recharge time is short, charging circuit requirement is simple, memory-less effect, temperature range width.
Accompanying drawing explanation
Accompanying drawing is used to offer and is further appreciated by of the present utility model, and constitutes a part for description, is used for explaining this utility model, but is not intended that restriction of the present utility model together with detailed description below.
Fig. 1 is a preferred embodiment principle schematic of a kind of electricity meter-reading concentrator back-up source of this utility model.
Fig. 2 is a preferred embodiment circuit diagram of a kind of electricity meter-reading concentrator back-up source of this utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail.It is merely to illustrate it should be appreciated that carry embodiment herein and explains this utility model, being not intended that restriction of the present utility model.
With reference to Fig. 1, a kind of electricity meter-reading concentrator back-up source, including MCU, power transfer module, super capacitor group, Unidirectional flow-limiting circuit, voltage collection circuit, switching circuit；Described power transfer module, is connected with main power source, and described Unidirectional flow-limiting circuit is arranged between described main power source and super capacitor group；Described voltage collection circuit is arranged between described super capacitor group and MCU；Described switching circuit is connected between described super capacitor group and MCU.
In one embodiment, described MCU selects universal models, such as AT89C51 single-chip microcomputer.
Fig. 2 gives a preferred embodiment of described Unidirectional flow-limiting circuit, and described Unidirectional flow-limiting circuit is composed in series by diode D2 and current-limiting resistance R1.
Fig. 2 gives a preferred embodiment of described voltage collection circuit, described voltage collection circuit is made up of divider resistance R4 and R5, and at resistance R5 two ends, shunt capacitance C3 is set, its output terminals A D is linked into the AD conversion interface of MCU, convert digital signal to, the MCU voltage according to the R5 two ends gathered, calculates the voltage V0 at super capacitor group two ends.
In a preferred embodiment, described switching circuit accesses described super capacitor group the first switching device (preferably selecting bipolar transistor), receives the control signal of described MCU, late-class circuit causes break-make control further；Pull-up device (preferably selects resistance), connects described first switching device, with the first voltage increase its break-make drawn or decay to the second voltage；Second switch device (preferably selects metal-oxide-semiconductor field effect transistor), the voltage difference according to the first described voltage and the second voltage, switches on or off the supply access to external loading.
Fig. 2 gives a preferred embodiment of described switching circuit, and described switching electricity routing resistance R7, bipolar transistor Q1, pull-up resistor R6, MOS switch FET form.The base stage of bipolar transistor Q1 is connected to an I/O interface of MCU by resistance R7, and its colelctor electrode is connected with the grid G of MOS switch FET, and is connected to the grid S of super capacitor group and MOS switch FET by pull-up resistor R6.The drain D of described MOS switch, as power output end, is connected with external loading and described main power source simultaneously.FET selects P-channel enhancement type MOS switch.When the CTL of described switching circuit terminates and receives high level, Q1 turns on, and the grid G of MOS switch FET is low level, because UG < US, so FET conducting, connects the super capacitor group supply access to external loading；When CTL termination receives low level, Q1 ends, and FET grid G voltage is equal with source S voltage, i.e. UG=US, so FET cut-off, cuts off the described super capacitor group supply access to external loading.
In a preferred embodiment, between described external loading and described power output end, it is equipped with DC-DC module, to provide external loading required voltage.
In a preferred embodiment, described super capacitor group is made up of super capacitor C1, C2 and 2 resistance R2, the R3 in parallel respectively with C1, C2 of 2 series connection.
In a preferred embodiment, the model of described super capacitor C1, C2 is 8F/2.7V.
In a preferred embodiment, described back-up source also includes the working power being connected with described main power source, for when main power source power-off, providing running voltage for described MCU.
In a preferred embodiment, main power source is preferably by mains-supplied.
Above-mentioned specific embodiment operation principle is as follows:
Described back-up source cold start-up, main power source, by mains-supplied, is directly powered for external loading by power output end on the one hand；Meanwhile, powered to MCU by power transfer module；Meanwhile, charged to super capacitor group with current limit by Unidirectional flow-limiting circuit；Meanwhile, reversely charged to super capacitor group by MOS switch；Now, the super capacitor group both end voltage V0 of voltage collection circuit Real-time Collection is being gradually increased, MCU compares super capacitor group both end voltage V0 and the minimum input voltage V1 of external loading, the super capacitor group path to external loading described in described switching circuit ON is controlled when V0 exports control signal more than or equal to V1, MCU；When main power source power-off, super capacitor group is powered to external loading immediately by switching circuit, it is achieved the bumpless transfer of main power source and back-up source is powered；Owing to super capacitor group is powered to external loading, cause that its both end voltage V0 is gradually reduced, when V0 is less than V1, MCU controls the super capacitor group path to external loading described in switching circuitry cuts by exporting control signal, it is prevented that because brownout causes MCU internal program to run by mistake.
Adopt technical solutions of the utility model, it is not necessary to additional designs charge management circuit, simplify hardware designs；Super capacitor have the advantage that compared with battery extra long life, discharge and recharge often, the discharge and recharge time is short, charging circuit requirement is simple, memory-less effect, temperature range width.
Aforementioned embodiments is only the preferably embodiment to technical solutions of the utility model, is not the restriction to technical solutions of the utility model, and technology category of the present utility model and claims are as the criterion with claims.In concept of the present utility model, it is possible to the technical solution of the utility model is carried out multiple simple variant, these simple variant belong to protection domain of the present utility model.
Claims (8)
1. an electricity meter-reading concentrator back-up source, it is characterised in that: include MCU, power transfer module, super capacitor group, Unidirectional flow-limiting circuit, voltage collection circuit, switching circuit；Described power transfer module, is connected with main power source, for, under described main power source electric power thus supplied, providing working power for described MCU；
Described Unidirectional flow-limiting circuit is arranged between described main power source and super capacitor group, for charging to described super capacitor group with current limit；
Described voltage collection circuit is arranged between described super capacitor group and MCU, for gathering super capacitor group both end voltage and exporting the AD interface to MCU；
Described switching circuit is connected between described super capacitor group and MCU, for according to the described MCU control signal exported, switching on or off the described super capacitor group supply access to external loading.
2. a kind of electricity meter-reading concentrator back-up source according to claim 1, it is characterized in that: described switching circuit accesses described super capacitor group, and include: the first switching device, receive the control signal of described MCU, further late-class circuit is caused break-make control；Pull-up device, connects described first switching device, with the first voltage increase its break-make drawn or decay to the second voltage；Second switch device, the voltage difference according to the first described voltage and the second voltage, switch on or off the described super capacitor group supply access to external loading.
3. a kind of electricity meter-reading concentrator back-up source according to claim 2, it is characterised in that: described second switch device is MOS switch.
4. a kind of electricity meter-reading concentrator back-up source according to claim 3, it is characterised in that: the drain D of described MOS switch, as power output end, is connected with external loading and described main power source simultaneously.
5. a kind of electricity meter-reading concentrator back-up source according to claim 4, it is characterised in that: between described external loading and described power output end, it is equipped with DC-DC module, to provide external loading required voltage.
6. a kind of electricity meter-reading concentrator back-up source according to claim 1, it is characterised in that: described super capacitor group is made up of super capacitor and multiple resistance in parallel respectively with described super capacitor of multiple series connection.
7. a kind of electricity meter-reading concentrator back-up source according to claim 6, it is characterised in that: the model of described super capacitor is 8F/2.7V.
8. a kind of electricity meter-reading concentrator back-up source according to claim 1, it is characterised in that: also include the working power being connected with described main power source, for when main power source power-off, providing running voltage for described MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521059153.XU CN205377417U (en) | 2015-12-18 | 2015-12-18 | Electric power meter reading is back -up source for concentrator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521059153.XU CN205377417U (en) | 2015-12-18 | 2015-12-18 | Electric power meter reading is back -up source for concentrator |
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| CN205377417U true CN205377417U (en) | 2016-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636450A (en) * | 2020-12-10 | 2021-04-09 | 福建星网视易信息系统有限公司 | Protection circuit based on super capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636450A (en) * | 2020-12-10 | 2021-04-09 | 福建星网视易信息系统有限公司 | Protection circuit based on super capacitor |
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