CN206099505U - Power supply and use this power supply's water gauge - Google Patents

Power supply and use this power supply's water gauge Download PDF

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Publication number
CN206099505U
CN206099505U CN201620693437.2U CN201620693437U CN206099505U CN 206099505 U CN206099505 U CN 206099505U CN 201620693437 U CN201620693437 U CN 201620693437U CN 206099505 U CN206099505 U CN 206099505U
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China
Prior art keywords
power supply
circuit
port
resistance
battery
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CN201620693437.2U
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Chinese (zh)
Inventor
丁明明
张方方
唐寅
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China Railway Water Group Co ltd
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WUHAN SHENGFAN ELECTRONICS STOCK CO Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/14Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

The utility model relates to a power supply and use this power supply's water gauge, wherein, power supply has included power supply circuit, battery power supply circuit and power supply selection circuit, power supply circuit's voltage output port, battery power supply circuit's voltage output port are connected with power supply selection circuit's voltage input port electricity respectively, power supply circuit's voltage input port is used for connecting external power supply, battery power supply circuit's voltage input port is used for connecting battery supply, power supply selection circuit is used for putting through power supply circuit to when the external power supply that power supply circuit connected falls the electricity, switch -on battery power supply circuit. The utility model provides a power supply and use this power supply's water gauge can improve power supply's power supply stability, guarantees the real -time and the accuracy of ultrasonic water meter measurement.

Description

Power supply and the water meter using the power supply
Technical field
The utility model is related to water meter technical field, in particular to a kind of power supply and using the power supply electricity The water meter in source.
Background technology
Ultrasonic water meter needs as the continuous and stable work of a metering product needed 6~10 years, and ultrasonic water meter Continued power just can guarantee that the real-time and accuracy of metering.At present common ultrasonic water meter adopt dry cell for main power source to Water meter is powered, and the capacity of dry cell is limited, once abnormity of power supply occur will directly affect the real-time of ultrasonic water meter metering Property, and then affect the accuracy of metering.If add on ultrasonic water meter checked meter and pre-payment related function module, electricity is done The technical bottleneck that pond powering mode is brought will be especially prominent.
For the problems referred to above, a kind of water meter of dual power supply concept is provided in correlation technique.In the art, except main power source Outward, in one stand-by power supply of two ends parallel connection of main power source.But substantially, the technical scheme is also only a battery in work, institute When effect and if only if the battery runs down or not enough delivery of meaning stand-by power supply, i.e. capacitor, interim supply water meter is closing The valve of water meter, and after water meter valve is closed, water meter cannot be used, and user is restricted with water, greatly have impact on user Normally use.
Therefore, the electrical stability of power supply how is improved, it is ensured that the real-time and accuracy of ultrasonic water meter metering Remain current problem demanding prompt solution.
Utility model content
In view of this, the purpose of the utility model embodiment is to provide a kind of power supply and using the power supply Water meter, it is possible to increase the electrical stability of power supply, it is ensured that ultrasonic water meter metering real-time and accuracy.
In a first aspect, the utility model embodiment provides a kind of power supply, including:Power supply circuit, battery are supplied Circuit and power supply selection circuit;
Wherein, the voltage output port of power supply circuit, battery feed circuit voltage output port respectively with power supply The control source port electrical connection of selection circuit;
The control source port of power supply circuit is used to connect external power supply;
The control source port of battery feed circuit is used to connect battery supply;
Power supply selection circuit is used to connect power supply circuit, and the external power supply power down connected in power supply circuit When, connect battery feed circuit.
With reference in a first aspect, the utility model embodiment provide first aspect the first possible embodiment, its In:Power supply selection circuit includes:Resistance bR1, farad capacitor bC1, diode bD1, electrostatic protector bD2 and compound diode bD3;
One end of resistance bR1 as power supply selection circuit voltage output port, the anode of the other end and diode bD1, The positive pole connection of farad capacitor bC1;
The negative pole of farad capacitor bC1 is connected with one end of electrostatic protector bD2;
The negative electrode of diode bD1, the other end of electrostatic protector bD2 are connected with the 3rd port of compound diode bD3;
The first port and second port of compound diode bD3 is respectively used to connect battery feed circuit and power supply electricity Road.
With reference to the first possible embodiment of first aspect, the utility model embodiment provides the of first aspect Two kinds of possible embodiments, wherein:Power supply circuit includes:Zener diode vD1, thermistor vRT1 and filtering are steady Die block;
The anode of Zener diode vD1, one end of thermistor vRT1 connect respectively the first port of external power supply and Two-port netwerk;
The negative electrode of Zener diode vD1 is connected with the other end of thermistor vRT1;
Filtering voltage regulation module is in parallel with Zener diode vD1.
Filtering voltage regulation module includes:Electric capacity vC1, mu balanced circuit vU1 and electric capacity vC2;
Electric capacity vC1 and electric capacity vC2 are connected between the grounding ports of mu balanced circuit vU1 and input port and are grounded Between port and output port;
The output port of mu balanced circuit vU1 is additionally operable to connect the voltage output port of power supply circuit.
With reference to the first possible embodiment of first aspect, the utility model embodiment provides the of first aspect Three kinds of possible embodiments, wherein:Battery feed circuit includes:Resistance bR3, resistance bR4, resistance bR5 and electric capacity bC2;
One end of resistance bR3 as battery feed circuit voltage output port, the first end of the other end and battery supply One end connection of mouth, resistance bR4;
The second port of battery supply is connected with one end of resistance bR5, electric capacity bC2 with earth terminal;
Resistance bR4, the other end of resistance bR5 are connected with the other end of electric capacity bC2.
With reference to the third possible embodiment of first aspect, the utility model embodiment provides the of first aspect Four kinds of possible embodiments, wherein:Battery feed circuit also includes:Battery voltage detection port;
One end connection battery voltage detection ports of the electric capacity bC2 away from ground connection;
Battery voltage detection port is used for the extraneous magnitude of voltage for obtaining the battery supply that battery feed circuit is connected.
With reference to four kinds of possible embodiments before first aspect, the utility model embodiment provides the 5th of first aspect Possible embodiment is planted, wherein:Also include:Power-fail detection circuit;
Power-fail detection circuit is electrically connected with power supply selection circuit;
Power-fail detection circuit exports high level letter in the external power supply power down that power supply circuit is connected, outwardly Number.
With reference to the 5th kind of possible embodiment of first aspect, the utility model embodiment provides the of first aspect Six kinds of possible embodiments, wherein:Power-fail detection circuit is specifically included:Resistance bR6, resistance bR7, resistance bR8, resistance bR9 And triode bQ1;
One end of resistance bR6 connects the second port of external power supply, the base stage of other end connecting triode bQ1;
Resistance bR7 is also associated between the base stage and emitter stage of triode bQ1, colelctor electrode connects one end of resistance bR9;
One end of the other end of resistance bR9 and resistance bR8 is used to being connected detection of power loss port, the other end of resistance bR8 with The voltage output port connection of power supply selection circuit.
Second aspect, the utility model embodiment additionally provides a kind of water meter, including:Meter body;Peace in meter body Power supply equipped with MCU module and as described in above-mentioned first aspect;
MCU module is connected with the voltage output port of power supply.
With reference to second aspect, the utility model embodiment provides the first possible embodiment of second aspect, its In:Also include:At least one in communicator, liquid crystal indicator, data acquisition unit, data storage device, prepaid devices Kind;
Communicator, liquid crystal indicator, data acquisition unit, data storage device, prepaid devices are and MCU module Connection.
With reference to the first possible embodiment of second aspect, the utility model embodiment provides the of second aspect Two kinds of possible embodiments, wherein:When power supply includes power-fail detection circuit, the detection of power loss end of power-fail detection circuit Mouth is connected with MCU module;
When MCU module obtains the high level that detection of power loss port is exported, control MCU module enters low-power consumption mode;
When battery feed circuit also includes battery voltage detection port, battery voltage detection port is connected with MCU module;
MCU module reads the voltage of the battery supply for accessing battery feed circuit, and when voltage is less than preset value, control Valve closing in meter body.
The utility model embodiment provides a kind of power supply and the water meter using the power supply, wherein, power supply Power supply includes power supply circuit, battery feed circuit and power supply selection circuit;The voltage output end of power supply circuit Mouth, the voltage output port of battery feed circuit electrically connect respectively with the control source port of power supply selection circuit;Power supply The control source port of circuit is used to connect external power supply;The control source port of battery feed circuit is used to connect battery electricity Source;In concrete power supply, power supply selection circuit can first connect power supply circuit, and now, power supply can pass through external Power supply is powered, and when external power supply power down, and power supply selection circuit can transfer to connect battery feed circuit, and battery is powered electricity Road is connected to battery, it is achieved thereby that continual power supply, improves electrical stability.And then use the power supply to be ultrasonic wave When water meter is powered, the real-time and accuracy of ultrasonic water meter metering can be ensured.
To enable above-mentioned purpose of the present utility model, feature and advantage to become apparent, preferred embodiment cited below particularly, and Coordinate appended accompanying drawing, be described in detail below.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the utility model embodiment, below will be to use needed for embodiment Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 shows a kind of structural representation of power supply that the utility model embodiment is provided;
Fig. 2 shown in the power supply that the utility model embodiment is provided, power supply selection circuit, battery feed circuit And the circuit diagram of power-fail detection circuit;
Fig. 3 shown in the power supply that the utility model embodiment is provided, the circuit diagram of power supply circuit;
Fig. 4 shows a kind of structural representation of water meter that the utility model embodiment is provided.
Illustrate:
11- power supplies;22-MCU modules;33- communicators;44- liquid crystal indicators;55- pre paid functionality devices; 66- data storage devices;77- data acquisition units;
111- power supply circuits;222- battery feed circuits;333- powers selection circuit;444- power-fail detection circuits.
Specific embodiment
It is new below in conjunction with this practicality to make purpose, technical scheme and the advantage of the utility model embodiment clearer Accompanying drawing in type embodiment, is clearly and completely described, it is clear that described to the technical scheme in the utility model embodiment Embodiment be only a part of embodiment of the utility model, rather than the embodiment of whole.Generally described in accompanying drawing herein Can arrange and design with a variety of configurations with the component of the utility model embodiment for illustrating.Therefore, below to The detailed description of the embodiment of the present utility model provided in accompanying drawing is not intended to limit claimed model of the present utility model Enclose, but be merely representative of selected embodiment of the present utility model.Based on embodiment of the present utility model, those skilled in the art exist The every other embodiment obtained on the premise of not making creative work, belongs to the scope of the utility model protection.
Consider to adopt up till now and power to ultrasonic water meter by the way of the stand-by power supply (capacitor) in parallel of main power source two ends, Electrical stability is poor, and affects the real-time of water meter measurement, or even affects user's water.Based on this, the application provide one Plant power supply and the water meter using the power supply, it is possible to increase the electrical stability of power supply, it is ensured that ultrasonic wave water The real-time and accuracy of meter amount.
For ease of understanding the present embodiment, a kind of power supply disclosed in the utility model embodiment is entered first Row is discussed in detail.It should be noted that the power supply that the utility model embodiment is provided, decapacitation is used in ultrasonic water meter Outward, can be also used in the middle of any electrical equipment.
A kind of structural representation of power supply shown in Figure 1, the power supply 11 includes:Power supply circuit 111st, battery feed circuit 222 and power supply selection circuit 333;
Wherein, the voltage output port difference of the voltage output port of power supply circuit 111, battery feed circuit 222 Electrically connect with the control source port of power supply selection circuit 333;The control source port of power supply circuit 111 is used to connect outer Connect power supply;The control source port of battery feed circuit 222 is used to connect battery supply;Power supply selection circuit 333 is used to connect Power supply circuit 111, and in the external power supply power down that power supply circuit 111 is connected, connect battery feed circuit 222。
When being embodied as, power supply circuit 111 is used for and external power supply connection, and the external power supply generally can be with It is the dc source of civil power, civil power Jing after step-down, rectification, can is the generator that stabling current can be provided, can also be vapour Device power supply (DPS)s such as car power supply, computer power etc..
The power supply 11 that the utility model embodiment is provided, powers electricity due to including power supply circuit 111, battery Road 222 and power supply selection circuit 333;The voltage output port of power supply circuit 111, the voltage of battery feed circuit 222 Output port is electrically connected respectively with the control source port of power supply selection circuit 333;The voltage input end of power supply circuit 111 Mouth is used to connect external power supply;The control source port of battery feed circuit 222 is used to connect battery supply;Specifically powering When, power supply selection circuit 333 can first connect power supply circuit 111, and now, power supply 11 can be supplied by external power supply Electricity, and when external power supply power down, power supply selection circuit 333 can transfer to connect battery feed circuit 222, battery feed circuit 222 are connected to battery, it is achieved thereby that continual power supply, improves electrical stability.The use of the power supply 11 is further super When sound wave water meter is powered, the real-time and accuracy of ultrasonic water meter metering can be ensured.
It is described in detail below for several circuits that power supply 11 is included, it is specifically, shown in Figure 2, The utility model embodiment additionally provides a kind of concrete structure of power supply selection circuit 333, and the power supply selection circuit 333 includes: Resistance bR1, farad capacitor bC1, diode bD1, electrostatic protector bD2 and compound diode bD3;
Wherein, one end of resistance bR1 as power supply selection circuit 333 voltage output port, the other end and diode bD1 Anode, farad capacitor bC1 positive pole connection;The negative pole of farad capacitor bC1 is connected with one end of electrostatic protector bD2;Two poles The negative electrode of pipe bD1, the other end of electrostatic protector bD2 are connected with the 3rd port of compound diode bD3;Compound diode The first port and second port of bD3 is respectively used to connect battery feed circuit 222 and power supply circuit 111.
In the utility model embodiment, power supply selection circuit 333 by resistance bR1, farad capacitor bC1, diode bD1, Electrostatic protector bD2, compound diode bD3 are constituted.When external power supply normal work, by the output of power supply circuit 111 The voltage VCC1 of voltage port output, the second port 2 of Jing compound diode bD3, the 3rd port 3 are supplied to other modules Electricity.At the same time, voltage VCC1 Jing compound diode bD3, resistance bR1 charge to farad capacitor bC1, until farad capacitor bC1 It is essentially identical with voltage VCC1 to the voltage of earth terminal GND_MCU.Wherein, electrostatic protector bD2 has prevents electrostatic breakdown electricity The function of other components and parts in road.When external power supply power-off, farad capacitor bC1 preferential Jing resistance bR1 provide voltage VCC_ MCU, the battery supply for now being connected in battery feed circuit (such as lithium battery) is released from passive state, battery feed circuit The first port 1 of 222 Jing compound diode bD3, the 3rd port 3 are powered to other modules.
Shown in Figure 3, the utility model embodiment additionally provides a kind of power supply circuit 111, the power supply electricity Road 111 includes:Zener diode vD1, thermistor vRT1 and filtering voltage regulation module;
Wherein, the anode of Zener diode vD1, one end of thermistor vRT1 connect respectively the first port of external power supply And second port;The negative electrode of Zener diode vD1 is connected with the other end of thermistor vRT1;Filtering voltage regulation module and voltage stabilizing two Pole pipe vD1 is in parallel.
Wherein, filtering voltage regulation module includes:Electric capacity vC1, mu balanced circuit vU1 and electric capacity vC2;Electric capacity vC1 and the electricity Hold vC2 to be connected between the grounding ports of the mu balanced circuit vU1 and input port and grounding ports and output port Between;The output port of mu balanced circuit vU1 is additionally operable to connect the voltage output port of the power supply circuit.
In the utility model embodiment, power supply circuit 111 connects an external power supply (DC source PWR), external The connection earth terminal GND_MCU of first port 1 of power supply, the one thermistor vRT1 of series connection of second port 2 of external power supply, can prevent Other components and parts in circuit are damaged when only high pressure, high current occurs in external power supply, it is then steady through Zener diode vD1 After pressure, it is filtered by filtering voltage regulation module so that the voltage source ripple of output, noise are greatly reduced, is other functions module Stable voltage source is provided.Additionally, the mu balanced circuit vU1 in filtering voltage regulation module is low voltage difference Micro Energy Lose CMOS (Complementary Metal Oxide Semiconductor;Complementary metal oxide semiconductors (CMOS)) voltage stabilizing circuit, its Output voltage high precision, and the electric current with super low-power consumption, height input is pressure, can carry out output short circuit protection.Electric capacity vC2 has Filter action, can make the voltage VCC1 high frequency characteristicses of whole circuit output more preferably, substantially reduce high frequency in output voltage source into Point, reduce the radiation to external power supply.Shown in Figure 2, the utility model embodiment additionally provides a kind of battery feed circuit 222, the battery feed circuit 222 includes:Resistance bR3, resistance bR4, resistance bR5 and electric capacity bC2;
One end of resistance bR3 as battery feed circuit 222 voltage output port, the first of the other end and battery supply Port 1, one end connection of resistance bR4;The second port 2 of battery supply (battery bJ3) is equal with one end of resistance bR5, electric capacity bC2 It is connected with earth terminal;Resistance bR4, the other end of resistance bR5 are connected with the other end of electric capacity bC2.
In the utility model embodiment, battery feed circuit 222 is by resistance bR3, resistance bR4, resistance bR5, electric capacity bC2 Composition, wherein resistance bR3, resistance bR4, electric capacity bC2 collectively constitute RC filter circuits, the interference signal in filtering circuit;Resistance BR4, resistance bR5, battery supply composition resist passivation circuit, effectively prevent battery to be passivated.
The voltage condition of battery supply is detected for convenience, and battery feed circuit 222 also includes:Battery voltage detection end Mouthful;One end connection battery voltage detection ports of the electric capacity bC2 away from ground connection;Battery voltage detection port is used for extraneous acquisition battery The magnitude of voltage of the battery supply that power supply circuits 222 are connected.
When implementing, battery voltage detection is drawn by resistance bR4, resistance bR5, electric capacity bC2 connections crosspoint Mouthful, external device can carry out voltage sample, judge whether battery supply under-voltage to battery supply, and according to the result of judgement come Perform the concrete control to external equipment.
Additionally, in the power supply 11 that the utility model embodiment is provided, also including:Power-fail detection circuit 444;Should Power-fail detection circuit 444 is electrically connected with power supply selection circuit 333;Power-fail detection circuit 444 is connected in power supply circuit 111 External power supply power down when, outwardly export high level signal.
Specifically, a kind of specific embodiment of power-fail detection circuit 444 shown in Figure 2, the power-fail detection circuit 444 is wrapped Include:Resistance bR6, resistance bR7, resistance bR8, resistance bR9 and triode bQ1;The of one end connection external power supply of resistance bR6 Two-port netwerk 2, the base stage of other end connecting triode bQ1;Resistance bR7 is also associated between the base stage and emitter stage of triode bQ1, Colelctor electrode connects one end of resistance bR9;The other end of resistance bR9 is used to be connected detection of power loss port with one end of resistance bR8, electricity The other end of resistance bR8 is connected with the voltage output port of power supply selection circuit 333.
In the utility model embodiment, power-fail detection circuit 444 is by resistance bR6, resistance bR7, resistance bR8, resistance bR9 And triode bQ1 compositions.When external power supply PWR power down, triode bQ1 cut-offs, now detection of power loss mouth output high level, Whole meter will reduce the consumption to battery electric quantity into power down low-power consumption mode.
The utility model embodiment additionally provides a kind of water meter, shown in Figure 4, and the water meter includes:Meter body;Water meter MCU module 22 and the power supply as described in above-mentioned embodiment 11 are installed in main body;MCU module 22 and power supply 11 Voltage output port connects.The concrete structure of power supply 11 and function can be found in above-described embodiment, will not be described here.
When implementing, above-mentioned water meter can also include:Communicator 33, liquid crystal indicator 44, data are adopted At least one of acquisition means 77, data storage device 66, prepaid devices 55;Wherein, communicator 33, liquid crystal indicator 44th, data acquisition unit 77, data storage device 66, pre paid functionality device 55 are connected with MCU module 22.
In the utility model embodiment, MCU module (Microcontroller Unit, micro-control unit), also known as list Piece microcomputer (Single Chip Microcomputer) or single-chip microcomputer, are a kind of IC chips, are different Do various combination control in application scenario.And the control core of the water meter that MCU module 22 is provided as the utility model embodiment, It can realize the functions such as data of water meter collection, data storage and reading, liquid crystal display, communication, pre-payment, power supply selection.Liquid Crystal device 44 shows integrated flow, residual flow, valve working state, battery undervoltage, communication by the control of MCU module 22 The data such as state, pre-payment.Pre paid functionality device 55 can according to the actual requirements select IC-card module or CPU card module, The ladder pre-payment of section metering, pricing for segment can be carried out, it is also possible to remote by data collection station, computer management system Charging/ladder charging is carried out with water information in the mode copy reading meter that journey is checked meter.Data storage device 66 mainly stores user The significant datas such as water data, logout, the running status of meter, even if breaking down economic dispute of also will not cause, side Just fault detect, is easy to management.Communicator 33 can select 485 communications, infrared communication, M-bus communications, radio communication, load The plurality of communication schemes such as wave communication.
Additionally, when above-mentioned power supply 11 includes power-fail detection circuit 444, the detection of power loss of power-fail detection circuit 444 Port is connected with MCU module 22;When MCU module 22 obtains the high level that detection of power loss port is exported, control MCU module 22 is entered Enter low-power consumption mode;
When battery feed circuit 222 also includes battery voltage detection port, battery voltage detection port and MCU module 22 Connection;MCU module 22 reads the voltage of the battery supply for accessing battery feed circuit 222, and when voltage is less than preset value, control Valve closing in meter body processed.
When implementing, when external power supply normal work, power supply selection circuit 333 preferentially connects power supply Circuit 111 is powered to meter, and now water meter can carry out real time measure, check meter in real time;When external power supply power down, MCU module 22 magnitudes of voltage for reading the battery supply for accessing battery feed circuit, when detecting cell voltage and being normal, selection circuit of powering 333 connect battery feed circuit 222, and now water meter can be checked meter with real time measure, discontinuity;When external power supply power down, MCU moulds Block 22 reads the magnitude of voltage of the battery supply for accessing battery feed circuit 222, when the battery supply voltage for detecting is less than default During value (battery supply voltage preset value can be arranged flexibly), the valve in meter body is automatically switched off, and stops user's water, this When, MCU module 22 preserves related continuous data by data storage device 66, and shows that battery is owed by liquid crystal indicator 44 Pressure bell character, so, ensures that the real-time and accuracy of water meter measurement.
It should be noted that in description of the present utility model, term " first ", " second ", " the 3rd " are only used for description Purpose, and it is not intended that indicating or implying relative importance.
In addition, in description of the present utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected;Can be It is mechanically connected, or electrically connects;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two The connection of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood in this practicality Concrete meaning in new.
Finally it should be noted that:Above example, specific embodiment only of the present utility model, to illustrate this practicality New technical scheme, rather than a limitation, protection domain of the present utility model is not limited thereto, although with reference to aforementioned enforcement Example has been described in detail to the utility model, it will be understood by those within the art that:It is any to be familiar with this technology neck In the technical scope that the utility model is disclosed, it still can be to the technical side described in previous embodiment for the technical staff in domain Case is modified or can readily occur in change, or carries out equivalent to which part technical characteristic;And these modifications, change Or replace, do not make the spirit and scope of essence disengaging the utility model embodiment technical scheme of appropriate technical solution.All Should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with the protection of claim Scope is defined.

Claims (8)

1. a kind of power supply, it is characterised in that include:Power supply circuit, battery feed circuit, power supply selection circuit and Power-fail detection circuit;
The voltage output port of the power supply circuit, the voltage output port of the battery feed circuit respectively with the confession The control source port electrical connection of electric selection circuit;
The control source port of the power supply circuit is used to connect external power supply;
The control source port of the battery feed circuit is used to connect battery supply;
The power supply selection circuit is used to connect the power supply circuit, and the power supply circuit connected it is external During power supply power-fail, the battery feed circuit is connected;
The power-fail detection circuit is electrically connected with the power supply selection circuit;
The power-fail detection circuit outwardly exports high level in the external power supply power down that the power supply circuit is connected Signal;
The power supply selection circuit includes:Resistance bR1, farad capacitor bC1, diode bD1, electrostatic protector bD2 and compound two Pole pipe bD3;
Wherein, one end of the resistance bR1 as the power supply selection circuit voltage output port, the other end and two pole The positive pole connection of the anode of pipe bD1, the farad capacitor bC1;
The negative pole of the farad capacitor bC1 is connected with one end of the electrostatic protector bD2;
The negative electrode of the diode bD1, the other end of the electrostatic protector bD2 are with the 3rd of the compound diode bD3 the Port connects;
The first port and second port of the compound diode bD3 is respectively used to connect the battery feed circuit and the confession Electric power circuit.
2. power supply according to claim 1, it is characterised in that the power supply circuit includes:Zener diode VD1, thermistor vRT1 and filtering voltage regulation module;
The anode of the Zener diode vD1, one end of the thermistor vRT1 connect respectively the first of the external power supply Port and second port;
The negative electrode of the Zener diode vD1 is connected with the other end of the thermistor vRT1;
The filtering voltage regulation module is in parallel with the Zener diode vD1;
The filtering voltage regulation module includes:Electric capacity vC1, mu balanced circuit vU1 and electric capacity vC2;
The electric capacity vC1 and the electric capacity vC2 are connected between the grounding ports of the mu balanced circuit vU1 and input port And between grounding ports and output port;
The output port of the mu balanced circuit vU1 is additionally operable to connect the voltage output port of the power supply circuit.
3. power supply according to claim 1, it is characterised in that the battery feed circuit includes:Resistance bR3, electricity Resistance bR4, resistance bR5 and electric capacity bC2;
One end of the resistance bR3 as the battery feed circuit voltage output port, the other end and the battery supply First port, the resistance bR4 one end connection;
The second port of the battery supply is connected with one end of the resistance bR5, the electric capacity bC2 with earth terminal;
The resistance bR4, the other end of the resistance bR5 are connected with the other end of the electric capacity bC2.
4. power supply according to claim 3, it is characterised in that the battery feed circuit also includes:Cell voltage Detection port;
The electric capacity bC2 connects the battery voltage detection port away from one end of ground connection;
The battery voltage detection port is used for the extraneous magnitude of voltage for obtaining the battery supply that the battery feed circuit is connected.
5. power supply according to claim 1, it is characterised in that the power-fail detection circuit is specifically included:Resistance BR6, resistance bR7, resistance bR8, resistance bR9 and triode bQ1;
One end of the resistance bR6 connects the second port of the external power supply, and the other end connects the base of the triode bQ1 Pole;
The resistance bR7 is also associated between the base stage and emitter stage of the triode bQ1, colelctor electrode connects the resistance bR9 One end;
The other end of the resistance bR9 is used to be connected detection of power loss port with one end of the resistance bR8, the resistance bR8's The other end is connected with the voltage output port of the power supply selection circuit.
6. a kind of water meter, it is characterised in that include:Meter body;MCU module is installed and such as right in the meter body Require the power supply described in 1-5 any one;
The MCU module is connected with the voltage output port of the power supply.
7. water meter according to claim 6, it is characterised in that also include:Communicator, liquid crystal indicator, data are adopted At least one of acquisition means, data storage device, prepaid devices;
The communicator, liquid crystal indicator, data acquisition unit, data storage device, prepaid devices with the MCU Module connects.
8. water meter according to claim 6, it is characterised in that when power supply includes power-fail detection circuit, it is described fall The detection of power loss port of power detection circuit is connected with the MCU module;
When the MCU module obtains the high level that the detection of power loss port is exported, control the MCU module and enter low-power consumption Pattern;
When battery feed circuit also includes battery voltage detection port, the battery voltage detection port and the MCU module Connection;
The MCU module reads the voltage of the battery supply for accessing the battery feed circuit, and in the voltage less than default During value, the valve closing in the meter body is controlled.
CN201620693437.2U 2016-07-04 2016-07-04 Power supply and use this power supply's water gauge Active CN206099505U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112134349A (en) * 2020-11-26 2020-12-25 苏州伟创电气科技股份有限公司 Power failure control method, controller and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112134349A (en) * 2020-11-26 2020-12-25 苏州伟创电气科技股份有限公司 Power failure control method, controller and system

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