CN211377694U - Clock power supply device - Google Patents
Clock power supply device Download PDFInfo
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- CN211377694U CN211377694U CN201922403733.0U CN201922403733U CN211377694U CN 211377694 U CN211377694 U CN 211377694U CN 201922403733 U CN201922403733 U CN 201922403733U CN 211377694 U CN211377694 U CN 211377694U
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Abstract
The application discloses clock power supply unit includes: the clock battery power supply module, the main power supply module, the super capacitor charge-discharge module and the meter reading battery power supply module are sequentially connected; the clock battery power supply module comprises a replaceable clock battery, and the anode of the clock battery is respectively connected with the anode of the first diode and the anode of the second diode; the meter reading battery power supply module comprises a replaceable lithium battery, the anode of the lithium battery is connected with the input pin of the LDO power supply, and the output pin of the LDO power supply is connected with the anode of the third diode; the main power supply module comprises an AC/DC voltage reduction switch power supply circuit; the super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit. Even when extreme unusual condition appears in this application, also can maintain clock power supply 48 hours through super capacitor for when electric power personnel carry out the battery replacement, guarantee that the clock can maintain the accuracy.
Description
Technical Field
The application relates to the technical field of instruments and meters, in particular to a clock power supply device.
Background
At present, the clock battery of the intelligent meter generally requires 3.6V and 1.2Ah, the PTC working current is very small under normal conditions, and the clock battery can be used for more than 5 years after power failure. However, in practical application, the internal resistance of the battery may be too large due to passivation and long-time power consumption to cause battery under-voltage, and once the battery is out of power, the time scale error of power accumulation, the time-sharing rate settlement error and other problems may be caused. Because the clock battery of present smart meter is built-in welding generally, in case the clock power supply takes place the undervoltage, the electric power department can only tear the table open, returns to the ammeter factory and opens the lid and change the battery. This causes trouble to the user as well as to the power sector.
SUMMERY OF THE UTILITY MODEL
The purpose of the application is to provide a clock power supply device, a main power supply module is preferentially used for supplying power to a clock power supply, the current of a battery is not consumed, when the clock power supply device is in a power failure condition, a rechargeable super capacitor charging and discharging module is preferentially used for supplying power, when the voltage of the super capacitor charging and discharging module is low, the voltage of a replaceable meter reading battery power supply module is consumed firstly, a replaceable clock battery which is supplied to a clock chip is consumed finally, and the electric energy meter is guaranteed to be accurate in the service life of normal work. Even when extreme abnormal conditions occur, the clock power supply can be maintained for 48 hours through the super capacitor, so that the clock can be maintained accurately when an electric power person replaces a battery.
In view of the above, the present application provides a clock power supply device, including: the clock battery power supply module, the main power supply module, the super capacitor charge-discharge module and the meter reading battery power supply module are sequentially connected;
the clock battery power supply module comprises a replaceable clock battery, the anode of the clock battery is respectively connected with the anode of a first diode and the anode of a second diode, and the cathodes of the first diode and the second diode are connected with a power pin of a clock chip;
the meter reading battery power supply module comprises a replaceable lithium battery, the anode of the lithium battery is connected with the input pin of the LDO power supply, the output pin of the LDO power supply is connected with the anode of a third diode, and the cathode of the third diode is connected with the power pin of the clock chip;
the main power supply module comprises an AC/DC voltage reduction switch power supply circuit which is connected with a power supply pin of the clock chip;
the super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit connected with the super capacitor charging circuit, and the super capacitor discharging circuit is connected with a power supply pin of the clock chip.
Optionally, the super capacitor charging circuit includes a filter capacitor, a fourth diode, a fifth diode, a current limiting resistor, and a super capacitor; one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected with the anodes of the fourth diode and the fifth diode respectively; and the cathodes of the fourth diode and the fifth diode are connected with one end of the super capacitor through the current-limiting resistor.
Optionally, the super capacitor discharge circuit includes a super capacitor, a sixth diode, a seventh diode, and a current limiting resistor; one end of the super capacitor is grounded, and the other end of the super capacitor is respectively connected with the anodes of the sixth diode and the seventh diode through the current-limiting resistor; and cathodes of the sixth diode and the seventh diode are both connected with a power pin of the clock chip.
Optionally, the super-capacitor is an electric double layer drawn capacitor.
Optionally, the fourth diode and the fifth diode are schottky diodes with a common cathode.
Optionally, the AC/DC buck switching power supply circuit includes an eighth diode and a ninth diode, and cathodes of the eighth diode and the ninth diode are both connected to the power pin of the clock chip.
Optionally, the replaceable clock battery is a lithium-thionyl chloride battery.
Optionally, the replaceable lithium battery is a lithium-manganese dioxide battery.
Optionally, the first diode and the second diode are schottky diodes of a common cathode.
Optionally, the LDO power supply comprises a low dropout regulator.
Compared with the prior art, the application has the advantages that:
the application provides a clock power supply unit, includes: the clock battery power supply module, the main power supply module, the super capacitor charge-discharge module and the meter reading battery power supply module are sequentially connected;
the clock battery power supply module comprises a replaceable clock battery, the anode of the clock battery is respectively connected with the anode of a first diode and the anode of a second diode, and the cathodes of the first diode and the second diode are connected with a power pin of a clock chip;
the meter reading battery power supply module comprises a replaceable lithium battery, the anode of the lithium battery is connected with the input pin of the LDO power supply, the output pin of the LDO power supply is connected with the anode of a third diode, and the cathode of the third diode is connected with the power pin of the clock chip;
the main power supply module comprises an AC/DC voltage reduction switch power supply circuit which is connected with a power supply pin of the clock chip;
the super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit connected with the super capacitor charging circuit, and the super capacitor discharging circuit is connected with a power supply pin of the clock chip.
The clock power supply device preferentially uses the main power supply module to supply power to the clock power supply, current of a battery is not consumed, when the clock power supply device is in a power failure condition, the rechargeable super capacitor charging and discharging module is preferentially used to supply power, when the voltage of the super capacitor charging and discharging module is low, the voltage of the replaceable meter reading battery power supply module is consumed firstly, and the replaceable clock battery which is supplied to the clock chip is consumed finally, so that the electric energy meter is guaranteed to be accurate in clock during the normal working life. Even when extreme abnormal conditions occur, the clock power supply can be maintained for 48 hours through the super capacitor, so that the clock can be maintained accurately when an electric power person replaces a battery.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a circuit diagram of a clock power supply device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all 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 embodiment of the application provides a clock power supply device, a main power supply module is preferentially used for supplying power to a clock power supply, the current of a battery is not consumed, when the clock power supply device is in a power failure condition, a rechargeable super capacitor charging and discharging module is preferentially used for supplying power, when the voltage of the super capacitor charging and discharging module is low, the voltage of a replaceable meter reading battery power supply module is consumed firstly, a replaceable clock battery which is supplied to a clock chip is consumed finally, and the electric energy meter is guaranteed to be accurate in clock in the normal working life. Even when extreme abnormal conditions occur, the clock power supply can be maintained for 48 hours through the super capacitor, so that the clock can be maintained accurately when an electric power person replaces a battery.
In the description of the present application, it is noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "connected" and "connected," unless expressly specified or limited otherwise, are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, a circuit diagram of a clock power supply device according to an embodiment of the present application is shown.
The embodiment of the application discloses clock power supply unit includes: the clock battery power supply module, the main power supply module, the super capacitor charge-discharge module and the meter reading battery power supply module are sequentially connected;
the clock battery power supply module comprises a replaceable clock battery, the anode of the clock battery is respectively connected with the anode of the first diode and the anode of the second diode, and the cathodes of the first diode and the second diode are connected with the power pin of the clock chip;
the meter reading battery power supply module comprises a replaceable lithium battery, the anode of the lithium battery is connected with the input pin of the LDO power supply, the output pin of the LDO power supply is connected with the anode of a third diode, and the cathode of the third diode is connected with the power pin of the clock chip;
the main power supply module comprises an AC/DC voltage reduction switch power supply circuit which is connected with a power supply pin of the clock chip;
the super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit connected with the super capacitor charging circuit, and the super capacitor discharging circuit is connected with a power supply pin of the clock chip.
It can be seen from fig. 1 that the clock power supply device provided in the embodiment of the present application includes a clock battery power supply module, a main power supply module, a super capacitor charge-discharge module, and a meter reading battery power supply module, where the clock battery power supply module includes: the clock circuit comprises a replaceable clock battery (3.6V) BAT1, a current limiting resistor R1, a first diode and a second diode which are connected in parallel. The negative electrode of the replaceable clock battery is connected with a power ground, the positive electrode of the replaceable clock battery is connected with one end of a current limiting resistor R1, the other end of R1 is connected with the anodes of a first diode and a second diode, and the cathodes of the two diodes are connected with a power pin VRTC of the clock chip.
The meter reading battery power supply module comprises a replaceable lithium battery (6V) BAT2, a current limiting resistor R3, filter capacitors C4 and C5, a low dropout regulator U1 and a diode D5. The negative pole of the replaceable lithium battery is grounded, the positive pole of the replaceable lithium battery is connected with one end of a current-limiting resistor R3, the other end of the current-limiting resistor R3 is connected with a filter capacitor C4 and is connected with a power input pin VIN of a low dropout regulator U1, an output pin VOUT of the low dropout regulator U1 and a filter capacitor C5 are connected with the anode of a diode D5, and the cathode of the diode D5 is connected with a power pin VRTC of a clock chip. The other end of C5 is grounded.
The super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit which are connected, and the super capacitor discharging circuit is connected with a power supply pin VRTC of the clock chip.
The main power supply module mainly supplies +5V voltage to the clock through two parallel diodes, anodes of the two diodes are connected with a main power supply with the output voltage of +5V, and cathodes of the two diodes are connected with a power supply pin VRTC of the clock chip.
When the electric energy meter normally supplies power, the voltage output by the main power supply is converted by the preceding stage AC/DC to output stable +5V voltage, and the stable +5V voltage is input to the clock chip VRTC through the two diodes. The two diodes are germanium tubes, the conduction voltage drop is about 0.2V, and the voltage on the VRTC is 4.8V. Meanwhile, the main power supply charges the super capacitor charging circuit, when charging is carried out, the super capacitor in the super capacitor charging circuit is charged firstly, after the super capacitor is fully charged, the voltage at the cathodes of two diodes connected with one end of the super capacitor does not exceed 4.8V, when the super capacitor passes through the anode of the other pair of diodes connected with the two diodes in series, because the voltage on the VRTC is already 4.8V when the main power supply is electrified, and the highest voltage of the anodes of the two diodes on the super capacitor discharging circuit is only 4.8V, the two diodes are clamped and cannot be conducted. Similarly, the voltage of the replaceable clock battery is 3.6V, and the two diodes connected to the replaceable clock battery are clamped and do not conduct, while the voltage output by the low dropout regulator U1 is 4.5V although the voltage of the replaceable lithium battery is 6V, and it should be noted that the output of the selected low dropout regulator is fixed to be 4.5V, so the diode D5 connected to the low dropout regulator is not conducted. Thus, when the electric energy meter is normally powered, the VRTC of the embodiment of the present application is mainly powered by the main power supply, and the main power supply also charges the supercapacitors C1 and C2 until the supercapacitors are fully charged.
When the electric energy meter is powered off, the voltage at the main power supply is 0, so the main power supply does not supply power to the VRTC any more, at this time, assuming that the super capacitor is fully charged, the anode of the super capacitor C1 can reach 4.8V theoretically, the power supply of the clock chip is discharged through two diodes, knowing that the voltage on the super capacitor is lower than 4.5V, the voltage is stabilized to 4.5V by a low-voltage-difference voltage stabilizer of the meter reading battery power supply module, and then the diode D5 is connected in series to supply power to the VRTC, so the battery capacity of the meter reading battery power supply module is 1400mAh, the power supply of the clock chip is generally 2-4uA current, and the theoretical calculation can be satisfied for more than 5. Only when the meter reading battery power supply module is under-voltage and the voltage on the super capacitor is lower than 3.6V, the VRTC is supplied with power by the clock battery, the clock battery is specially used for supplying power to the VRTC, the capacity of the clock battery is 1200mAh, and the situation that the electric energy meter is used for more than 10 years can be met theoretically. The clock chip is not powered off in the working life of the whole electric energy meter.
When the clock battery and the meter reading battery power supply module of the electric energy meter are under-voltage, namely abnormal conditions occur, the VRTC is still supplied with power by a main power supply during power-on, an event is generated and reported to a power grid (software processing), the super capacitor is charged, and when the power grid is powered off, the super capacitor discharges to maintain the clock power supply to operate for 48 hours.
The embodiment of the application preferentially supplies power to the power supply of the clock through the main power supply module under the normal working condition, the current of the lithium battery is not consumed, when the power failure occurs, the rechargeable super capacitor is preferentially used for supplying power, when the voltage of the super capacitor is low, the voltage of the power supply module of the electricity meter is consumed firstly, and finally the replaceable clock battery which is supplied to the clock chip is consumed, so that the accuracy of the clock of the electric energy meter is ensured during the normal working life. When an extremely abnormal condition occurs, the clock power supply can be maintained for 48 hours through the super capacitor, so that when an electric power person replaces a battery, the clock can be maintained accurately.
Further, the super capacitor charging circuit comprises a filter capacitor, a fourth diode, a fifth diode, a current limiting resistor and a super capacitor; one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected with the anodes of the fourth diode and the fifth diode respectively; and cathodes of the fourth diode and the fifth diode are connected with one end of the super capacitor through a current-limiting resistor.
It should be noted that the super capacitor charging circuit provided in the embodiment of the present application is composed of a filter capacitor, two diodes, a current limiting resistor, and a super capacitor; one end of the filter capacitor C3 is grounded, the other end of the filter capacitor C3 is connected with the power supply and the anodes of the two diodes, the cathodes of the two diodes are connected with one end of the current-limiting resistor R2, the other end of the R2 is connected with the anode of the super capacitor C1, the cathode of the super capacitor C1 is connected with the anode of the super capacitor C2, and the cathode of the super capacitor C2 is grounded. That is, supercapacitor C1 is connected in series with supercapacitor C2.
Further, the super capacitor discharging circuit comprises a super capacitor, a sixth diode, a seventh diode and a current limiting resistor; one end of the super capacitor is grounded, and the other end of the super capacitor is respectively connected with the anodes of the sixth diode and the seventh diode through the current-limiting resistor; cathodes of the sixth diode and the seventh diode are connected with a power supply pin of the clock chip.
It should be noted that the super capacitor discharge circuit includes a super capacitor, two diodes and a current limiting resistor. The anodes of the two diodes are connected with the cathodes of the two diodes of the super capacitor charging circuit, and the cathodes of the two diodes are connected with a power supply pin VRTC of the clock chip.
Further, the super capacitor is a double electric layer drawing method capacitor.
The super capacitor shared by the super capacitor charging circuit and the super capacitor discharging circuit may be an electric double layer capacitor.
Further, the fourth diode and the fifth diode are schottky diodes with a common cathode.
It should be noted that, in the embodiment of the present application, two diodes connected in parallel as shown in fig. 1 are schottky diodes with a common cathode.
Further, the AC/DC buck switching power supply circuit comprises an eighth diode and a ninth diode, and cathodes of the eighth diode and cathodes of the ninth diode are both connected with a power supply pin of the clock chip.
It should be noted that the main power module is provided with two schottky diodes sharing a cathode, and cathodes of the two schottky diodes are both connected to the power supply pin VRTC of the clock chip.
Further, the replaceable clock battery is a lithium-thionyl chloride battery.
It should be noted that the replaceable lithium battery of the clock battery power supply module may be a lithium-thionyl chloride battery.
Further, the replaceable lithium battery is a lithium-manganese dioxide battery.
It should be noted that the replaceable lithium battery in the meter reading battery power supply module may be a lithium-manganese dioxide battery.
Further, the first diode and the second diode are Schottky diodes with a common cathode.
It should be noted that both the two diodes in the clock battery power supply module are schottky diodes with a common cathode.
Further, the meter reading battery power supply module comprises a low dropout regulator.
It should be noted that the meter reading battery power supply module includes a low dropout regulator.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A clock power supply apparatus, comprising: the clock battery power supply module, the main power supply module, the super capacitor charge-discharge module and the meter reading battery power supply module are sequentially connected;
the clock battery power supply module comprises a replaceable clock battery, the anode of the clock battery is respectively connected with the anode of a first diode and the anode of a second diode, and the cathodes of the first diode and the second diode are connected with a power pin of a clock chip;
the meter reading battery power supply module comprises a replaceable lithium battery, the anode of the lithium battery is connected with the input pin of the LDO power supply, the output pin of the LDO power supply is connected with the anode of a third diode, and the cathode of the third diode is connected with the power pin of the clock chip;
the main power supply module comprises an AC/DC voltage reduction switch power supply circuit which is connected with a power supply pin of the clock chip;
the super capacitor charging and discharging module comprises a super capacitor charging circuit and a super capacitor discharging circuit connected with the super capacitor charging circuit, and the super capacitor discharging circuit is connected with a power supply pin of the clock chip.
2. The clock power supply unit according to claim 1, wherein the super capacitor charging circuit comprises a filter capacitor, a fourth diode, a fifth diode, a current limiting resistor and a super capacitor; one end of the filter capacitor is grounded, and the other end of the filter capacitor is connected with the anodes of the fourth diode and the fifth diode respectively; and the cathodes of the fourth diode and the fifth diode are connected with one end of the super capacitor through the current-limiting resistor.
3. The clock power supply unit according to claim 1, wherein the super capacitor discharge circuit comprises a super capacitor, a sixth diode, a seventh diode, a current limiting resistor; one end of the super capacitor is grounded, and the other end of the super capacitor is respectively connected with the anodes of the sixth diode and the seventh diode through the current-limiting resistor; and cathodes of the sixth diode and the seventh diode are both connected with a power pin of the clock chip.
4. A clock power supply unit as claimed in claim 2 or 3, wherein the super capacitor is an edl capacitor.
5. The clock supply of claim 2, wherein said fourth diode and said fifth diode are common cathode schottky diodes.
6. The clock power supply of claim 1, wherein the AC/DC buck switching power supply circuit includes an eighth diode and a ninth diode, the cathodes of the eighth diode and the ninth diode each being connected to a power pin of the clock chip.
7. A clock power supply unit as claimed in claim 1, wherein the replaceable clock battery is a lithium-thionyl chloride battery.
8. The clock power supply of claim 1, wherein said replaceable lithium battery is a lithium-manganese dioxide battery.
9. The clock supply of claim 1, wherein the first diode and the second diode are common cathode schottky diodes.
10. The clock power supply of claim 1, wherein the LDO power supply comprises a low dropout regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922403733.0U CN211377694U (en) | 2019-12-27 | 2019-12-27 | Clock power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922403733.0U CN211377694U (en) | 2019-12-27 | 2019-12-27 | Clock power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211377694U true CN211377694U (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922403733.0U Active CN211377694U (en) | 2019-12-27 | 2019-12-27 | Clock power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211377694U (en) |
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2019
- 2019-12-27 CN CN201922403733.0U patent/CN211377694U/en active Active
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Address after: Room 501-503, annex building, Huaye building, No.1-3 Chuimao new street, Xihua Road, Yuexiu District, Guangzhou City, Guangdong Province 510000 Patentee after: China Southern Power Grid Power Technology Co.,Ltd. Address before: Room 501-503, annex building, Huaye building, No.1-3 Chuimao new street, Xihua Road, Yuexiu District, Guangzhou City, Guangdong Province 510000 Patentee before: GUANGDONG ELECTRIC POWER SCIENCE RESEARCH INSTITUTE ENERGY TECHNOLOGY Co.,Ltd. |