CN216413983U - Power supply circuit and smart electric meter - Google Patents
Power supply circuit and smart electric meter Download PDFInfo
- Publication number
- CN216413983U CN216413983U CN202122024576.XU CN202122024576U CN216413983U CN 216413983 U CN216413983 U CN 216413983U CN 202122024576 U CN202122024576 U CN 202122024576U CN 216413983 U CN216413983 U CN 216413983U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- power supply
- battery
- clock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model provides a power supply circuit and an intelligent electric meter, wherein the power supply circuit comprises a meter reading battery, a clock battery, a mains supply, a first voltage isolation circuit, a second voltage isolation circuit, a clock power supply, a voltage detection circuit and a voltage switch circuit. The voltage switch circuit is respectively and electrically connected with the voltage detection circuit, the first voltage isolation circuit and the clock battery; the meter reading battery is respectively and electrically connected with the voltage detection circuit and the first voltage isolation circuit; the second voltage isolation circuit is respectively connected with the first voltage isolation circuit, the commercial power supply and the clock power supply. The meter reading battery is connected into the power supply circuit preferentially, the clock battery is consumed after the meter reading battery is consumed, the service time of the clock battery can be prolonged, the stability of power supply of a clock power supply is ensured, and the reliability and the stability of the operation of the intelligent ammeter are improved.
Description
Technical Field
The utility model relates to a power supply circuit, in particular to a power supply circuit which consumes an external battery firstly and then consumes an internal battery.
Background
Under the power failure state, when the ammeter needs to be checked, the intelligent ammeter needs to be pressed to wake up the MCU to perform functions such as LCD display, the power consumption of the battery is greatly increased at the moment, the service life of the clock battery is greatly shortened, and therefore the external replaceable meter reading battery is added during design and is matched with the clock battery, and the two compete to supply power to the clock power supply. As shown in fig. 1, in the prior art, the voltage of the meter reading battery is equal to the voltage of the clock battery, and the meter reading battery and the clock battery compete for supplying power to the clock power supply, when the battery runs for a long time or is stored, and the battery is under-voltage, the clock battery and the meter reading battery have no electric quantity at the same time, if the meter reading battery is not replaced timely or replaced, the internal clock power supply is unstable, the clock running timing of the electric meter is inaccurate, and the quality hidden troubles such as inaccurate multi-rate time-sharing measurement of the intelligent electric meter, error in event recording time scale and the like may occur.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that a clock battery and a meter reading battery are under-voltage simultaneously, the utility model provides an intelligent ammeter of a battery power supply competition circuit.
A power supply circuit comprises a meter reading battery, a clock battery, a mains supply, a first voltage isolation circuit, a second voltage isolation circuit, a clock power supply, a voltage detection circuit and a voltage switch circuit; the voltage switch circuit is respectively and electrically connected with the voltage detection circuit, the first voltage isolation circuit and the clock battery; the meter reading battery is respectively and electrically connected with the voltage detection circuit and the first voltage isolation circuit; the second voltage isolation circuit is respectively connected with the first voltage isolation circuit, the commercial power supply and the clock power supply. The meter reading battery is an external replaceable battery, and the clock battery is an internal clock battery.
Further, the voltage switching circuit comprises a resistor and a MOS tube.
Further, the voltage switch circuit comprises a first resistor and an NPN triode.
Further, the voltage detection circuit comprises a second resistor, a third resistor and an NPN triode.
Further, the voltage detection circuit further comprises a fourth resistor and a processing chip, wherein the fourth resistor and the processing chip are connected in series between the NPN triode and the second resistor and between the NPN triode and the third resistor.
Furthermore, the drain electrode of the MOS tube is connected with the clock battery, the grid electrode of the MOS tube is connected with the voltage detection circuit, and the source electrode of the MOS tube is connected with the first voltage isolation circuit.
Furthermore, the collector of the NPN triode is connected to the internal clock power supply, the base is connected to the voltage detection circuit, and the emitter is connected to the first voltage isolation circuit.
Furthermore, the collector of the NPN triode is connected with the voltage switch circuit, the emitter of the NPN triode is connected with the meter reading battery, and the base of the NPN triode is connected with the second resistor and the third resistor.
Further, the first voltage isolation circuit includes a double diode, and the second voltage isolation circuit includes a double diode.
The utility model also provides an intelligent ammeter which comprises any one of the power supply circuits.
The utility model has the beneficial effects that:
whether voltage detection circuit detects the battery of checking meter and has the electricity, whether rethread control voltage switch circuit control clock battery inserts power supply circuit, when the battery of checking meter has the electricity, disconnection voltage switch circuit, the battery of checking meter inserts power supply circuit preferentially, the battery of checking meter has been consumed, consume the clock battery again, the live time of clock battery can be prolonged, and when changing the battery of checking meter, inside clock power keeps supplying power, the outage condition can not appear in clock power, ensure that clock power supplies power stably, the reliability and the stability of smart electric meter operation are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the structure of a prior art solution;
FIG. 2 is a schematic structural diagram in the embodiment;
FIG. 3 is a schematic circuit diagram of the embodiment 1;
FIG. 4 is a schematic circuit diagram of the embodiment 2;
FIG. 5 is a schematic circuit diagram of the scheme of embodiment 3.
Detailed Description
In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The utility model is further elucidated with reference to the drawings and the embodiments.
In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
Example 1
A circuit structure of the power supply circuit is shown in figure 2 and comprises a meter reading battery, a clock battery, a mains supply, a first voltage isolation circuit, a second voltage isolation circuit, an MCU clock power supply, a voltage detection circuit and a voltage switch circuit.
The voltage switch circuit is respectively and electrically connected with the voltage detection circuit, the first voltage isolation circuit and the clock battery; the meter reading battery is respectively and electrically connected with the voltage detection circuit and the first voltage isolation circuit; the second voltage isolation circuit is respectively connected with the first voltage isolation circuit, the commercial power supply and the MCU clock power supply.
The voltage detection circuit detects the voltage of the meter reading battery, when the meter reading battery is electrified, the voltage switch is controlled to be switched off, and at the moment, the clock battery is not connected into the circuit and does not consume the clock battery. When the meter reading battery has no electric quantity and is under-voltage, the voltage detection circuit controls the voltage switch circuit to be conducted, and at the moment, the clock battery is connected into the circuit to supply power for the clock power supply. When the meter reading battery is replaced by a new battery, the voltage detection circuit controls the voltage switch circuit to be disconnected again. Therefore, the electric quantity of the meter reading battery can be preferentially consumed, and the electric quantity of the internal teeth of the internal clock is saved, so that the reliability and the stability of the online operation of the intelligent electric meter are improved.
As shown in fig. 3, P1 is a plug interface of an external replaceable meter reading battery, B1 is an internal clock battery, and K1 is a clock battery short-circuit point. VBAT is MCU clock power, and 3.7V is the constant voltage power supply after the alternating current commercial power is stepped down through AC-DC.
The voltage switching circuit comprises a resistor R1 and a MOS tube Q1; the voltage detection circuit comprises a resistor R2, a resistor R3 and an NPN triode; the first voltage isolation circuit and the second voltage isolation circuit both comprise double diodes.
R1 in the voltage switching circuit is a MOS divider resistor. The drain of the MOS transistor is connected with an internal clock power supply B1, the grid of the MOS transistor is connected with the collector of an NPN triode in the voltage detection circuit, and the source of the MOS transistor is connected with the anode of one of the diodes in the first voltage isolation circuit.
The collector of an NPN triode in the voltage detection circuit is connected with an MOS (metal oxide semiconductor) tube in the voltage switching circuit, the emitter of the NPN triode is connected with a meter reading battery P1, and the base of the NPN triode is connected with a resistor R2 and a resistor R3.
The working principle of the circuit is as follows:
a base electrode PN of the NPN triode Q2 has the junction conduction threshold voltage characteristic, for example, a germanium tube is 0.3V, and a silicon tube is 0.7V; the resistors R2 and R3 divide the voltage, sample and detect the external DC3.6V, and the meter reading battery voltage can be changed. When the voltage of the external DC3.6V replaceable meter reading battery is electrified, the divided sampling voltage of the resistors R2 and R3 is larger than the conduction threshold voltage of the base PN junction of the triode Q2, and the triode Q2 is conducted. When the voltage of the external DC3.6V replaceable meter reading battery is under-voltage, namely no electricity, the divided and sampled voltages of the resistors R2 and R3 are smaller than the conduction threshold voltage of the base PN junction of the triode Q2, and the triode Q2 is cut off and switched off.
The switch tube in the voltage switch circuit adopts the MOS tube of N communication, and the on-resistance is little, and the voltage is little when switching on. When the external DC3.6V replaceable meter reading battery is electrified, the triode Q2 is conducted, the grid G of the MOS tube Q1 in the voltage switch circuit is at a low level, the MOS tube Q1 is switched off, and the battery power of DC3.6V clocks is not consumed at the moment. When the external DC3.6V replaceable meter reading battery is free of power and under-voltage, the triode Q2 is cut off, the voltage of the grid G of the MOS transistor Q1 is pulled up to be high level under the action of the pull-up resistor R1, and the MOS transistor Q1 is switched on and powered by the DC3.6V clock battery.
The resistors R1, R2, and R3 in this embodiment consume part of the battery power during operation, and when selecting the resistance value, it is necessary to select a large resistance value as much as possible under the normal operation condition of the circuit, so as to reduce the power consumption of the resistors R1, R2, and R3 as much as possible.
Example 2
As shown in fig. 4, the difference from embodiment 1 is that the MOS transistor in the circuit switching circuit is replaced by an NPN transistor.
The voltage switch circuit comprises a resistor R1 and an NPN triode; the voltage detection circuit comprises a resistor R2, a resistor R3 and an NPN triode; the first voltage isolation circuit and the second voltage isolation circuit both comprise double diodes.
R1 in the voltage switch circuit is an NPN tube divider resistor. The collector of the NPN tube is connected with an internal clock power supply B1, the base of the NPN tube is connected with the collector of the NPN triode in the voltage detection circuit, and the emitter of the NPN tube is connected with the anode of one of the diodes in the first voltage isolation circuit.
The collector of an NPN triode in the voltage detection circuit is connected with an NPN tube in the voltage switching circuit, the emitter of the NPN triode is connected with a meter reading battery P1, and the base of the NPN triode is connected with a resistor R2 and a resistor R3.
The working principle of embodiment 2 is the same as that of embodiment 1.
Example 3
As shown in fig. 5, unlike embodiment 1, a processing chip and a resistor R4 are added to the voltage detection circuit, and a resistor R4 is connected in series with the processing chip between the NPN transistor Q2 and the resistor R2 and the resistor R3. Resistor R4 current-limiting resistor, control the current of NPN triode.
The working principle of the power supply circuit of the embodiment is as follows: the processing chip divides voltage A/D sampling through a resistor R2 and a resistor R3, detects the voltage of the meter reading battery, and controls the on-off of a triode Q2 through an I/O port of the processing chip, so that the on-off of an MOS (metal oxide semiconductor) tube in the voltage switch circuit is controlled, and the clock battery is connected or not connected into the circuit.
Example 4
The embodiment provides a smart meter, which comprises any one of the power supply circuits of the embodiments 1 to 3.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the foregoing embodiments, and various equivalent changes (such as number, shape, position, etc.) may be made to the technical solution of the present invention within the technical spirit of the present invention, and the equivalents are protected by the present invention.
It should be noted that, the specific implementation principle, circuit, and required components of the main control module related in the embodiment of the present invention all adopt the prior art known to those skilled in the art, and for implementation of the control principle, those skilled in the art need not pay creative labor, and are not described herein again.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A power supply circuit comprises a meter reading battery, a clock battery, a mains supply, a first voltage isolation circuit, a second voltage isolation circuit and a clock power supply, and is characterized by further comprising a voltage detection circuit and a voltage switch circuit;
the voltage switch circuit is respectively and electrically connected with the voltage detection circuit, the first voltage isolation circuit and the clock battery;
the meter reading battery is respectively and electrically connected with the voltage detection circuit and the first voltage isolation circuit; the second voltage isolation circuit is respectively connected with the first voltage isolation circuit, the commercial power supply and the clock power supply.
2. The power supply circuit of claim 1, wherein the voltage switching circuit comprises a resistor and a MOS transistor.
3. The power supply circuit of claim 1, wherein the voltage switching circuit comprises a first resistor and an NPN transistor.
4. The power supply circuit of claim 1, wherein the voltage detection circuit comprises a second resistor, a third resistor, and an NPN transistor.
5. The power supply circuit according to claim 4, wherein the voltage detection circuit further comprises a fourth resistor and a processing chip, and the fourth resistor and the processing chip are connected in series between the NPN transistor and the second resistor and the third resistor.
6. The power supply circuit of claim 2, wherein the drain of the MOS transistor is connected to the clock battery, the gate of the MOS transistor is connected to the voltage detection circuit, and the source of the MOS transistor is connected to the first voltage isolation circuit.
7. The power supply circuit of claim 3, wherein said NPN triode has a collector connected to said clock battery, a base connected to said voltage detection circuit, and an emitter connected to said first voltage isolation circuit.
8. The power supply circuit according to claim 4, wherein the NPN triode has a collector connected with the voltage switching circuit, an emitter connected with the meter reading battery, and a base connected with the second resistor and the third resistor.
9. The power supply circuit of claim 1, wherein the first voltage isolation circuit comprises a double diode and the second voltage isolation circuit comprises a double diode.
10. A smart meter comprising the power supply circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122024576.XU CN216413983U (en) | 2021-08-25 | 2021-08-25 | Power supply circuit and smart electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122024576.XU CN216413983U (en) | 2021-08-25 | 2021-08-25 | Power supply circuit and smart electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216413983U true CN216413983U (en) | 2022-04-29 |
Family
ID=81288579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122024576.XU Active CN216413983U (en) | 2021-08-25 | 2021-08-25 | Power supply circuit and smart electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216413983U (en) |
-
2021
- 2021-08-25 CN CN202122024576.XU patent/CN216413983U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213243599U (en) | BMS low-power consumption dormancy power supply control and awakening circuit | |
| CN100559326C (en) | Low voltage detection system | |
| CN108429332B (en) | Super capacitor application circuit of battery replaceable intelligent electric energy meter power supply | |
| CN113472056A (en) | Dual-power supply system of remote intelligent gas meter | |
| CN103904762A (en) | Vehicle-mounted lead-acid storage battery intelligent charger | |
| CN206362841U (en) | Long-life intelligent electric energy meter based on super capacitor and button-shaped lithium-manganese cell | |
| CN216413983U (en) | Power supply circuit and smart electric meter | |
| CN208112325U (en) | The super capacitor application circuit of battery changeable type intelligent electric energy meter power supply | |
| CN214201596U (en) | Electric energy meter detection circuit and smart electric meter | |
| CN215990185U (en) | Overvoltage protection circuit and electrical equipment | |
| CN212992031U (en) | Linear power supply power-off detection circuit | |
| CN212909093U (en) | Backup power circuit of modular power consumption information acquisition terminal | |
| CN111525542B (en) | Power supply method for safely storing data of intelligent electric energy meter | |
| CN211318588U (en) | Intelligent electric energy meter with low-frequency load shedding function | |
| CN203747473U (en) | Dedicated chip integrating linear charging and constant-voltage output | |
| CN203502529U (en) | Switching on/of judging circuit of electric leakage reclosure breaker | |
| CN112751475B (en) | Novel synchronous rectification backflow-preventing circuit | |
| CN201503570U (en) | Computer power supply with quasi-zero standby power consumption | |
| CN209283090U (en) | A kind of switch controller of low power consumption and low cost | |
| CN212518524U (en) | Automatic switching and battery voltage monitoring circuit for battery and system power supply | |
| CN206060343U (en) | Power supply switch circuit and with measuring instrument made by the circuit | |
| CN205725691U (en) | A kind of soy bean milk making machine powder down memory circuit | |
| CN217692702U (en) | RTC module power supply circuit, RTC circuit and electronic equipment | |
| CN219678159U (en) | Low-power consumption battery management circuit | |
| CN208848046U (en) | A kind of new energy resources system real-time clock power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |