CN218733395U - Power failure and supply circuit for intelligent electric meter - Google Patents
Power failure and supply circuit for intelligent electric meter Download PDFInfo
- Publication number
- CN218733395U CN218733395U CN202222928483.4U CN202222928483U CN218733395U CN 218733395 U CN218733395 U CN 218733395U CN 202222928483 U CN202222928483 U CN 202222928483U CN 218733395 U CN218733395 U CN 218733395U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- circuit
- voltage
- linear voltage
- chip
- 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
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a power failure supply circuit of an intelligent ammeter, which comprises a first linear voltage stabilizer circuit, a second linear voltage stabilizer circuit and a capacitor charging and discharging circuit; the capacitor charging and discharging circuit is used for current limiting and voltage limiting charging and power storage during normal power supply and providing power to the ammeter chip in preference to the battery during power failure; the first linear voltage stabilizer circuit is used for reducing the voltage of the input voltage and realizing the voltage conversion when in normal power supply, and obtaining a voltage which provides input for the second linear voltage stabilizer circuit and the capacitor charging and discharging circuit; the second linear voltage stabilizer circuit is used for reducing the voltage of the input voltage to realize the conversion of the power supply voltage when the power supply is normal or the power failure occurs, and the required voltage is obtained to compete with the battery to provide power for the electric meter chip. The utility model discloses the circuit is simple, low cost, and compatible super capacitor and the supply circuit of two kinds of differences of rechargeable battery condenser have very strong adaptability and practicality.
Description
Technical Field
The utility model relates to a smart electric meter power failure power supply technical field, in particular to smart electric meter power failure supply circuit.
Background
In the overseas electricity meter production market, the requirement of maintaining the normal work of the electricity meter for 7 days due to power failure and over capacity exists. Because the current electric meters are developed in the direction of intellectualization and integration, when power failure is caused due to abnormity, the intelligent electric meter needs to maintain an RTC (micro control unit) chip to ensure normal work of basic functions of the electric meter (ensure complete data record in the period from power failure to power re-on). The conventional super capacitor circuit design can only meet the requirements of 48 or 72 hours, cannot meet the requirements of 7 days and the like required by partial regions, and the intelligent electric meter power failure supply circuit based on the rechargeable battery capacitor can be designed to solve the problem in order to meet the different time lengths of the RTC of the MCU chip for the super capacitors in the requirements of different regions.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a smart electric meter power failure supply circuit.
The utility model adopts the following scheme: a power failure power supply circuit of an intelligent ammeter comprises a first linear voltage stabilizer circuit, a second linear voltage stabilizer circuit and a capacitor charging and discharging circuit; the first linear voltage stabilizer circuit is respectively connected with the capacitor charging and discharging circuit and the second linear voltage stabilizer circuit, and the second linear voltage stabilizer circuit is connected with the capacitor charging and discharging circuit;
the capacitor charging and discharging circuit is used for current limiting and voltage limiting charging and power storage during normal power supply, and provides power to the ammeter chip in preference to the battery during power failure, and comprises a capacitor and a single lithium ion battery protection chip;
the first linear voltage stabilizer circuit is used for reducing the voltage of input voltage and realizing the voltage conversion when in normal power supply, and obtaining voltage which provides input for the second linear voltage stabilizer circuit and the capacitor charging and discharging circuit;
the second linear voltage stabilizer circuit is used for reducing the voltage of input voltage to realize the conversion of power supply voltage when the power is supplied normally or in power failure, obtains required voltage to compete with a battery, and provides power for the electric meter chip.
Preferably, the capacitor charging and discharging circuit comprises a resistor RV21, a resistor RV22, a resistor RV23, a capacitor CV23, a capacitor EV20 and a single-chip lithium ion battery protection chip UV22; the first end of the resistor RV21 is connected with a current-limiting resistor of the first linear voltage stabilizer circuit, and the second end of the resistor RV is connected with a PCKP pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV22 is connected with a PCKP pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV22 is connected with a BYPS pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV23 is connected with a PCKN pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV23 is connected with a BATN pin of the single-chip lithium ion battery protection chip; the first end of the capacitor CV23 is connected with a BYPS pin of a single lithium ion battery protection chip, and the second end of the capacitor CV23 is connected with the first end of a capacitor EV 20; the second terminal of the capacitor EV20 is connected to the input of the second linear regulator.
Preferably, the first linear regulator circuit comprises a capacitor CV22, a capacitor CV20, a linear regulator UV2, a current limiting resistor RV20 and a schottky diode DV20, wherein a first end of the capacitor CV22 is grounded, and a second end is connected to an input end of the linear regulator UV 20; the first end of the capacitor CV20 is grounded, and the second end of the capacitor CV20 is connected with the output end of the linear voltage regulator UV 20; the first end of schottky double diode DV20 is connected with output end of nature stabiliser UV20, and the first end of current-limiting resistor RV20 is connected to the second end, the first end of resistance RV21 among the capacitor charging and discharging circuit is connected to the second end of current-limiting resistor RV 20.
Preferably, the second linear regulator circuit comprises a capacitor CV21, a schottky diode DV21 and a linear regulator UV21, wherein a first end of the capacitor CV21 is grounded, and a second end is connected to an output end of the linear regulator UV 21; the first end of the Schottky double diode DV21 is connected with the output end of the linear voltage stabilizer UV21, the other end of the Schottky double diode DV21 is connected with a short-circuit welding point JV1, and the short-circuit welding point JV1 is used for serially connecting the battery into a circuit.
Preferably, the maximum charging voltage of the capacitor EV20 is 3.95V.
Preferably, the capacitors CV20, CV21, CV22 and CV23 are all chip ceramic capacitors, and have a capacity of 1uF and a withstand voltage of 25V.
Preferably, the reverse breakdown voltages of the schottky double diode DV20 and the schottky double diode DV21 are both 30V.
Compared with the prior art, the utility model discloses there is following beneficial effect: the utility model carries out compatible design to the power failure supply circuit of different overseas intelligent meters, and realizes flexible switching of the circuit when different demands are met; the circuit protection function comprises charge and discharge protection, battery overcharge, overdischarge, overcurrent detection and protection. The charging and discharging processes of the battery capacitor are protected, and phenomena such as overcharge and undervoltage are avoided; the circuit is simple, low cost, compatible two kinds of different supply circuits of super capacitor and rechargeable battery condenser, has very strong adaptability and practicality.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
As shown in fig. 1, the embodiment provides a power failure supply circuit for a smart meter, which includes a first linear voltage regulator circuit, a second linear voltage regulator circuit, and a capacitor charging and discharging circuit; the first linear voltage stabilizer circuit is respectively connected with the capacitor charging and discharging circuit and the second linear voltage stabilizer circuit, and the second linear voltage stabilizer circuit is connected with the capacitor charging and discharging circuit;
the capacitor charging and discharging circuit is used for current limiting and voltage limiting charging and power storage during normal power supply and provides power to the ammeter chip in priority to the battery during power failure, and comprises a resistor RV21, a resistor RV22, a resistor RV23, a capacitor CV23, a capacitor EV20 and a single-chip lithium ion battery protection chip UV22; the first end of the resistor RV21 is connected with a current-limiting resistor of the first linear voltage stabilizer circuit, and the second end of the resistor RV is connected with a PCKP pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV22 is connected with a PCKP pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV22 is connected with a BYPS pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV23 is connected with a PCKN pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV23 is connected with a BATN pin of the single-chip lithium ion battery protection chip; the first end of the capacitor CV23 is connected with a BYPS pin of the single-chip lithium ion battery protection chip, and the second end of the capacitor CV23 is connected with the first end of the capacitor EV 20; the second terminal of the capacitor EV20 is connected to the input terminal of the linear regulator UV21 of the second linear regulator. Capacitor EV20 charges the energy storage when normal power supply, discharges when having a power failure, guarantees its normal work for the power supply of ammeter chip, can change the model according to the demand.
The first linear voltage stabilizer circuit is used for reducing the voltage of the input voltage and realizing the voltage conversion when in normal power supply, and obtaining a voltage which provides input for the second linear voltage stabilizer circuit and the capacitor charging and discharging circuit; the first linear voltage stabilizer circuit comprises a capacitor CV22, a capacitor CV20, a linear voltage stabilizer UV2, a current limiting resistor RV20 and a Schottky double diode DV20, wherein the first end of the capacitor CV22 is grounded, and the second end of the capacitor CV22 is connected with the input end of the linear voltage stabilizer UV 20; the first end of the capacitor CV20 is grounded, and the second end of the capacitor CV is connected with the output end of the linear voltage regulator UV 20; the first end of Schottky double diode DV20 is connected with the output end of linear voltage stabilizer UV20, the second end is connected with the first end of current limiting resistor RV20, and the second end of current limiting resistor RV20 is connected with the first end of resistor RV21 in the capacitor charging and discharging circuit.
The second linear voltage stabilizer circuit is used for reducing the voltage of the input voltage to realize the conversion of the power supply voltage when the power supply is normal or the power failure occurs, and the required voltage competes with the battery to provide power for the electric meter chip. The second linear voltage regulator circuit comprises a capacitor CV21, a Schottky double diode DV21 and a linear voltage regulator UV21, wherein the first end of the capacitor CV21 is grounded, and the second end of the capacitor CV21 is connected with the output end of the linear voltage regulator UV 21; the first end of the Schottky double diode DV21 is connected with the output end of the linear voltage stabilizer UV21, the other end of the Schottky double diode DV21 is connected with a short-circuit welding point JV1, and the short-circuit welding point JV1 is used for serially connecting a battery into a circuit.
Wherein RV20 is a chip resistor with a resistance of 62 omega;
RV21 is a chip resistor with the resistance value of 1K omega;
RV22 and RV23 are chip resistors with the resistance value of 0 omega;
CV20, CV21, CV22 and CV23 are chip ceramic capacitors with a capacity of 1uF and a withstand voltage of 25V;
DV20 and DV21 are Schottky double diodes, the reverse breakdown voltage is 30V, certain voltage drop is generated when the diodes are conducted in the forward direction, and the reverse flow influence can be prevented when the diodes are conducted in the reverse direction;
EV20 is a battery capacitor with a maximum charging voltage of 3.95V;
UV20 is LDO, output voltage 4V;
UV21 is LDO, and the output voltage is 3.6V;
UV22 is a single-chip lithium ion battery protection chip for charging and discharging protection of a capacitor.
The working principle is as follows: when the intelligent ammeter is connected with alternating voltage for normal power supply, the circuit is in a charging state, and MHVDD voltage is used for charging a battery capacitor by outputting voltage through a linear voltage stabilizer UV 20; the capacitors CV20 and CV22 in the first linear regulator circuit serve to stabilize the input and output and prevent oscillation. The voltage has a certain voltage drop after passing through the Schottky diode DV20, the current is limited through the resistor RV20, one path of the voltage after passing through the resistor RV20 is output to the second linear voltage stabilizer UV21, the voltage is reduced after passing through the Schottky diode DV21 and competes with a battery, and the capacitor CV21 is used for stably outputting the voltage; and the other path of the current is connected to a single lithium ion battery protection chip UV22, the chip can monitor the battery capacitor EV20, the battery capacitor EV20 is switched off when being charged to the maximum voltage to prevent overcharging, the resistor RV21 is used for limiting the current, the resistor RV22 is used for inhibiting input noise, and the resistor RV23 is not used during charging. When the circuit is in a normal power supply state, the voltage output by the second linear voltage stabilizer circuit is larger than the voltage of the battery, and the battery cannot be used;
when power is off, the circuit is in a discharging state, MHVDD has no voltage, EV20 discharges to supply power to the chip, and the RV23 is used for closing output; when the EV20 voltage reaches the discharge cutoff voltage, the battery power supply is switched. I.e. in a power-off state, the voltage of the capacitor is used as an input to the second linear regulator circuit, and when the output voltage is lower than the battery voltage, the battery is switched to supply power.
The foregoing description, taken in conjunction with the drawings, illustrate specific embodiments herein sufficiently to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for those of others. The scope of the embodiments herein includes the full ambit of the claims, as well as all available equivalents of the claims. The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a structure, device, or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like herein, as used herein, are defined as orientations or positional relationships based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description herein, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, and indirect connections via intermediary media, where the specific meaning of the terms is understood by those skilled in the art as appropriate. Herein, the term "plurality" means two or more, unless otherwise specified.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art, and it should be understood by those skilled in the art that various modifications, changes, equivalents, and the like which can be made without inventive work based on the technical solution of the present invention are included in the protection scope of the present application.
Claims (7)
1. The utility model provides a smart electric meter power failure supply circuit which characterized in that: the circuit comprises a first linear voltage stabilizer circuit, a second linear voltage stabilizer circuit and a capacitor charging and discharging circuit; the first linear voltage stabilizer circuit is respectively connected with the capacitor charging and discharging circuit and the second linear voltage stabilizer circuit, and the second linear voltage stabilizer circuit is connected with the capacitor charging and discharging circuit;
the capacitor charging and discharging circuit is used for current limiting and voltage limiting charging and power storage during normal power supply, provides power to the ammeter chip in preference to the battery during power failure, and comprises a capacitor and a single lithium ion battery protection chip;
the first linear voltage stabilizer circuit is used for reducing the voltage of input voltage and realizing the voltage conversion when in normal power supply, and obtaining voltage which provides input for the second linear voltage stabilizer circuit and the capacitor charging and discharging circuit;
the second linear voltage stabilizer circuit is used for reducing the voltage of input voltage to realize the conversion of power supply voltage when the power is supplied normally or in power failure, obtains required voltage to compete with a battery, and provides power for the electric meter chip.
2. The intelligent ammeter power failure supply circuit of claim 1, wherein: the capacitor charging and discharging circuit comprises a resistor RV21, a resistor RV22, a resistor RV23, a capacitor CV23, a capacitor EV20 and a single-chip lithium ion battery protection chip UV22; the first end of the resistor RV21 is connected with a current-limiting resistor of the first linear voltage stabilizer circuit, and the second end of the resistor RV is connected with a PCKP pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV22 is connected with a PCKP pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV is connected with a BYPS pin of the single-chip lithium ion battery protection chip; the first end of the resistor RV23 is connected with a PCKN pin of the single-chip lithium ion battery protection chip, and the second end of the resistor RV23 is connected with a BATN pin of the single-chip lithium ion battery protection chip; the first end of the capacitor CV23 is connected with a BYPS pin of a single lithium ion battery protection chip, and the second end of the capacitor CV23 is connected with the first end of a capacitor EV 20; the second terminal of the capacitor EV20 is connected to the input of the second linear regulator.
3. The intelligent ammeter power failure supply circuit of claim 2, wherein: the first linear voltage stabilizer circuit comprises a capacitor CV22, a capacitor CV20, a linear voltage stabilizer UV2, a current limiting resistor RV20 and a Schottky double diode DV20, wherein the first end of the capacitor CV22 is grounded, and the second end of the capacitor CV22 is connected with the input end of the linear voltage stabilizer UV 20; the first end of the capacitor CV20 is grounded, and the second end of the capacitor CV20 is connected with the output end of the linear voltage regulator UV 20; the first end of schottky double diode DV20 is connected with output end of nature stabiliser UV20, and the first end of current-limiting resistor RV20 is connected to the second end, the first end of resistance RV21 among the capacitor charging and discharging circuit is connected to the second end of current-limiting resistor RV 20.
4. The intelligent ammeter power failure supply circuit of claim 3, wherein: the second linear voltage regulator circuit comprises a capacitor CV21, a Schottky double diode DV21 and a linear voltage regulator UV21, wherein the first end of the capacitor CV21 is grounded, and the second end of the capacitor CV21 is connected with the output end of the linear voltage regulator UV 21; the first end of the Schottky double diode DV21 is connected with the output end of the linear voltage stabilizer UV21, the other end of the Schottky double diode DV21 is connected with a short-circuit welding point JV1, and the short-circuit welding point JV1 is used for serially connecting the battery into a circuit.
5. The intelligent ammeter power failure supply circuit of claim 2, wherein: the maximum charging voltage of the capacitor EV20 is 3.95V.
6. The intelligent ammeter power failure supply circuit of claim 4, wherein: the capacitor CV20, the capacitor CV21, the capacitor CV22 and the capacitor CV23 are all patch ceramic capacitors, and have a capacity of 1uF and a withstand voltage of 25V.
7. The intelligent ammeter power failure supply circuit of claim 4, wherein: the reverse breakdown voltages of the Schottky double diode DV20 and the Schottky double diode DV21 are both 30V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928483.4U CN218733395U (en) | 2022-11-03 | 2022-11-03 | Power failure and supply circuit for intelligent electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222928483.4U CN218733395U (en) | 2022-11-03 | 2022-11-03 | Power failure and supply circuit for intelligent electric meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218733395U true CN218733395U (en) | 2023-03-24 |
Family
ID=85604686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222928483.4U Active CN218733395U (en) | 2022-11-03 | 2022-11-03 | Power failure and supply circuit for intelligent electric meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218733395U (en) |
-
2022
- 2022-11-03 CN CN202222928483.4U patent/CN218733395U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101997147B (en) | Secondary battery | |
| US7423410B2 (en) | Battery protecting circuit | |
| US20050112420A1 (en) | Power supply device | |
| US9077189B2 (en) | Battery protection circuit module device | |
| CN102868193A (en) | Solar energy power supply circuit for wireless sensor network node | |
| CN110912259A (en) | Clock power supply device | |
| CN117595449A (en) | Charging and discharging control device, charging control method and discharging control method | |
| CN212304781U (en) | Multi-path battery charging and discharging management circuit | |
| CN218733395U (en) | Power failure and supply circuit for intelligent electric meter | |
| CN219960154U (en) | Battery protection circuit and battery management system | |
| CN102647002A (en) | Composite device system | |
| CN212726547U (en) | Solar supplementary power supply system based on primary battery and composite capacitor | |
| CN215990263U (en) | Integrated circuit and system for battery charging and discharging protection | |
| CN209913490U (en) | Battery protection chip and battery system | |
| CN211377694U (en) | Clock power supply device | |
| CN111431262A (en) | Solar supplementary power supply system based on primary battery and composite capacitor | |
| CN209184290U (en) | A kind of power supply management circuit | |
| CN107453452B (en) | Multi-cell series lithium battery based on load switch | |
| RU222970U1 (en) | Uninterruptible DC power supply | |
| CN213717653U (en) | Novel battery charge-discharge control circuit | |
| CN215870848U (en) | Battery active equalization device, chip, battery management system and electric equipment | |
| CN217882927U (en) | Charger and reverse connection prevention protection circuit thereof | |
| CN213754027U (en) | Battery pack device | |
| CN209786856U (en) | Power supply device and tool | |
| CN111880005B (en) | Loop resistance tester and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |