CN106532908B - Double-core electric energy meter and power supply control method thereof - Google Patents
Double-core electric energy meter and power supply control method thereof Download PDFInfo
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- CN106532908B CN106532908B CN201610903410.6A CN201610903410A CN106532908B CN 106532908 B CN106532908 B CN 106532908B CN 201610903410 A CN201610903410 A CN 201610903410A CN 106532908 B CN106532908 B CN 106532908B
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- 239000003990 capacitor Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 59
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims 3
- 238000007726 management method Methods 0.000 description 98
- 230000005540 biological transmission Effects 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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Abstract
The invention relates to a double-core electric energy meter and a power supply control method thereof. The double-core electric energy meter comprises a metering core, a first control circuit and a second control circuit, wherein the metering core is used for realizing the electric energy metering function; the management core is used for realizing a non-electric energy metering management function; and the power management control module is used for realizing independent power supply of the metering core and the management core. The power management control module comprises a main power supply, a clock battery and a stop-reading battery, and the control method is that when the main power supply is powered on, all power supplies are provided by the main power supply, and the metering core is powered by an independent power supply branch; when the main power supply is powered off, the clock battery provides power for the clock circuit RTC of the metering core, and the copy stopping battery provides power for the management core; when the clock battery is replaced, the super capacitor temporarily provides power supply for the clock circuit RTC in the metering core.
Description
Technical Field
The invention relates to the field of electric energy meters, in particular to a double-core electric energy meter and a power supply control method thereof.
Background
With the diversification of customer requirements, the twin-core electric energy meter based on the IR46 standard will become the development direction of the electric energy meter in the future China. The double-core electric energy meter requires that a metering core (a functional module for realizing electric energy metering statistics in the electric energy meter) and a management core (a functional module for realizing data transmission, storage and the like in the electric energy meter) are separated, namely the metering core and the management core are separated, and a metering part can work independently. However, the electric energy meter in China is designed in an integrated mode at present, namely, the metering part and the non-metering part do not have independent working requirements. The power supply part of the electric energy meter mainly comprises a main power supply, a copy stopping battery and a clock battery, wherein the copy stopping battery is replaceable, and the clock battery is not replaceable. When the main power supply is powered on, the electric energy meter is provided with all consumption by the main power supply; when the main power supply is powered off, the power supply of the battery is stopped and the power is supplied preferentially; when the stop-copy battery is under-voltage, the clock battery supplies power. Therefore, the existing power supply control circuit cannot meet the independent power supply requirement of the double-core electric energy meter.
Disclosure of Invention
In order to solve the above problems, the present invention provides a dual-core electric energy meter with a novel power management control module. Through novel power management control module can provide stand-by power supply respectively for the measurement core and the management core of two-core electric energy meter to satisfy the requirement that two-core electric energy meter supplied power alone for each module. The double-core electric energy meter of the invention comprises:
the metering core is composed of a clock circuit RTC and a metering unit and is used for realizing the electric energy metering function;
the management core is used for realizing non-electric energy metering management functions, such as data storage and data transmission functions; and
and the power management control module is used for realizing independent power supply for the metering core and the management core, so that the metering core and the management core can work independently.
Preferably, the power management control module includes:
the main power supply is electrically connected with the metering unit and the RTC in the metering core and the management core respectively and is used for providing power supply for the metering unit and the RTC in the metering core and the management core respectively;
the clock battery is electrically connected with the RTC in the metering core and is used for providing power supply for the metering core after the power supply is cut off; and
and the copy stopping battery is electrically connected with the management core and is used for supplying power to the management core after the main power supply is powered off.
Preferably, the power management control module further includes a first diode, the first diode is connected in series between the clock battery and the RTC, the anode is electrically connected to the clock battery, and the cathode is electrically connected to the RTC, the first diode is configured to prevent the clock battery from providing power to the RTC when the main power supply is powered on.
Preferably, the power management control module further includes a second diode, the second diode is connected in series between the main power source and the first diode, the anode is electrically connected to the main power source, and the cathode is electrically connected to the cathode of the first diode and the RTC, and the second diode is used for preventing the clock battery from charging the main power source when the clock battery is working.
Preferably, the power management control module further includes a super capacitor, which is located between the second diode and the RTC, and is used for charging the super capacitor when the main power supply or the clock battery supplies power, and for supplying power to the RTC when the main power supply is powered off and the clock battery is under-voltage or the clock battery is replaced.
Preferably, the power management control module further includes a third diode, which is connected in series between the off-battery and the management core, the anode of the third diode is electrically connected to the off-battery, and the cathode of the third diode is electrically connected to the management core, and the third diode is configured to prevent the off-battery from providing power to the management core when the main power supply is powered on.
Preferably, the power management control module further includes a fourth diode, which is located between the main power supply and the management core, the anode of the fourth diode is electrically connected to the main power supply, and the cathode of the fourth diode is electrically connected to the cathode of the third diode and the management core, and the fourth diode is used for preventing the off-copy battery from charging the main power supply when the off-copy battery is in operation.
Preferably, in order to meet the requirement of event detection such as power supply abnormality and full voltage loss when the electric energy meter is powered off, the power management control module further comprises a controlled switch, and the controlled switch is arranged between the metering unit in the metering core and the cathode of the third diode and is electrically connected with a management chip in a management core for controlling the opening and closing of the controlled switch. When the main power supply is powered off, the metering unit can control the on-off of the controlled switch through the management core to perform primary detection, so that the metering core is ensured to effectively complete the detection process.
Preferably, the management core of the two-core electric energy meter further comprises a backlight unit, and the backlight unit is electrically connected with a main power supply.
Preferably, the management core of the two-core electric energy meter further comprises a buzzer, and the buzzer is electrically connected with a main power supply.
Preferably, the management core of the two-core electric energy meter further comprises an infrared device, and the infrared device is electrically connected with the cathode of the fourth diode.
Preferably, the power management control module further includes five voltage conversion units for performing voltage conversion of the circuit, the first voltage conversion unit is located between the first diode and the super capacitor, the second voltage conversion unit is located between the fourth diode and the management core, the third voltage conversion unit is located between the second diode and the metering unit, the fourth voltage conversion unit is located between the main power supply and the fourth diode, and the fifth voltage conversion unit is located between the stop battery and the third diode.
Preferably, the power control method of the power management control module includes:
when the main power supply is powered on:
an independent branch circuit is used for supplying power to a clock circuit RTC and a super capacitor in the metering core after voltage of the independent branch circuit is reduced by a fourth voltage conversion unit, a second diode and a first voltage conversion unit in sequence;
an independent branch circuit is supplied with power to the metering unit in the metering core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit and the third voltage conversion unit in sequence;
an independent branch circuit is supplied with power to the management unit in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit, the fourth diode and the second voltage conversion unit in sequence;
an independent branch circuit is powered on by an infrared device in the management core after the voltage of the independent branch circuit is reduced by a fourth voltage conversion unit and a fourth diode in sequence;
an independent branch circuit is powered to a backlight unit in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit;
an independent branch circuit is powered to a buzzer in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit; and
the main power supply is prevented from charging the clock battery and the copy stopping battery through the cut-off of the first diode and the third diode;
when the main power supply is powered off:
one independent branch is powered by a clock circuit RTC and a super capacitor in the metering core after the voltage of the clock battery is reduced by a first diode and a first voltage conversion unit in sequence;
an independent branch route stop-copy battery is used for supplying power to a management unit in the management core after voltage is reduced by a fifth voltage conversion unit, a third diode and a second voltage conversion unit in sequence, and the management chip in the management unit controls the closing of the controlled switch to supply power to a metering unit in the metering core so as to ensure that the metering chip completes event detection processes, such as power supply abnormity, full voltage loss and other event detection;
an independent branch route stop-copy battery sequentially reduces the voltage through a fifth voltage conversion unit and a third diode and then supplies power to an infrared device in the management core;
when the clock battery is replaced, the super capacitor temporarily provides power for a clock circuit RTC in the metering core so as to ensure the accuracy of the clock of the metering core; and
the clock battery and the stop battery are prevented from charging the main power supply through the cut-off of the second diode and the fourth diode.
In summary, by using the power management control method, independent power supply can be realized for the metering core and the management core no matter when the main power supply is powered on or powered off, so that the metering core and the management core can work independently, and the independent power supply requirement of the electric energy meter with the metering core and the management core is fully met.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be obtained by reference to the following drawings.
Fig. 1 shows a circuit structure diagram of a two-core electric energy meter with a novel power management control module according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals. Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a circuit configuration diagram of a two-core electric energy meter having a novel power management control module according to an embodiment of the present invention. As shown in fig. 1, according to the preferred embodiment of the present invention, the two-core electric energy meter includes a metering core 1, a management core 2 and a power management control module 3.
Preferably, the metering core 1 is composed of a metering unit 11 and a clock circuit RTC12 for implementing the power metering function. The management core 2 is used for realizing non-metering management functions of the electric energy meter, such as data storage, transmission and other functions; the management core 2 includes a management unit 21, an infrared device 22, a backlight unit 23, a buzzer 24, and the like, and the management unit 21 is provided with a management Chip (CPU)211, a Flash cache 212, a communication unit 213, and the like. The power management control module 3 is arranged in the electric energy meter and used for supplying independent power to the metering core and the management core.
Preferably, the power management control module 3 includes: a main power supply 31 electrically connected to the metering unit 11 and the clock circuit RTC12 in the metering core and the management core 2, respectively, for supplying power to the metering unit 11 and the clock circuit RTC12 in the metering core and the management core 2, respectively; a clock battery 33 electrically connected with a clock circuit RTC12 in the metering core 1 and used for providing power supply for the metering core 1 and the super capacitor 36 after the power supply is cut off; and a stop battery 32 electrically connected to the management core 2 for supplying power to the management core 2 after the main power supply 31 is powered off.
Preferably, the power management control module 3 further includes a first diode D1, the first diode D1 is connected in series between the clock battery 33 and the clock circuit RTC12, the anode is electrically connected to the clock battery 3, and the cathode is electrically connected to the clock circuit RTC12, the first diode D1 is used for preventing the clock battery 33 from providing power to the clock circuit RTC12 when the main power supply 31 is powered on.
Preferably, the power management control module 3 further includes a second diode D2, the second diode D2 is connected in series between the main power source 31 and the first diode D1, the anode is electrically connected to the main power source 31, and the cathode is electrically connected to the cathode of the first diode D1 and the clock circuit RTC12, the second diode D2 is used for preventing the clock battery 33 from charging the main power source 31 when the clock battery 33 is working.
Preferably, the power management control module 3 further includes a super capacitor 36, which is located between the second diode D2 and the clock circuit RTC12, and is used to charge the super capacitor 36 when the main power source 31 or the clock battery 33 supplies power, and the super capacitor 36 supplies power to the clock circuit RTC12 when the main power source 31 is powered off and the clock battery 33 is under-voltage or the clock battery 33 is replaced.
Preferably, the power management control module 3 further includes a third diode D3, the third diode D3 is connected in series between the off-battery 32 and the management core 2, the anode is electrically connected to the off-battery 32, and the cathode is electrically connected to the management core 2, the third diode D3 is configured to prevent the off-battery 32 from providing power to the management core 2 when the main power supply 31 is powered on.
Preferably, the power management control module 3 further includes a fourth diode D4, the fourth diode D4 is located between the main power source 31 and the management core 2, the anode is electrically connected to the main power source 31, and the cathode is electrically connected to the cathode of the third diode D3 and the management core 2, and the fourth diode D4 is configured to prevent the battery 32 from charging the main power source 31 when the battery 32 is in operation.
Preferably, the power management control module 3 further includes a controlled switch 35, and the controlled switch 35 is disposed between the metering unit 11 in the metering core 1 and the cathode of the third diode D3, and is electrically connected to the management chip 211 in the management core 2 for controlling the opening and closing of the controlled switch. When the main power supply 31 is powered off, the metering unit 11 can perform a detection by the management core 2 controlling the opening and closing of the controlled switch 35, thereby ensuring that the metering core 1 effectively completes the detection process.
Preferably, the management core 2 of the two-core electric energy meter further comprises a backlight unit 23, and the backlight unit 23 is electrically connected with the main power supply 31.
Preferably, the management core 2 of the two-core electric energy meter further comprises a buzzer 24, and the buzzer 24 is electrically connected with the main power supply 31.
Preferably, the management core 2 of the two-core electric energy meter further comprises an infrared device 22 electrically connected to the cathode of the fourth diode D4.
Preferably, the power management control module further includes five voltage conversion units for performing voltage conversion of the circuit, the first voltage conversion unit 341 is located between the first diode D1 and the super capacitor 36, the second voltage conversion unit 342 is located between the fourth diode D4 and the management core 2, the third voltage conversion unit 343 is located between the second diode D2 and the metering unit 11, the fourth voltage conversion unit 344 is located between the main power supply 31 and the fourth diode D4, and the fifth voltage conversion unit 345 is located between the shutdown battery 32 and the third diode D3.
In practical application, the voltage required by the management unit 21 in the measurement core 1 and the management core 2 is 3.3V, and the voltages required by the infrared device 22, the backlight unit 23 and the buzzer 24 are higher, so when the main power supply 31 is powered on, the fourth voltage conversion unit 344 converts the voltage of the main power supply 31 into 5.6V, the voltage of the 5.6V is reduced to 5V after passing through D4 and D2, and the voltage of the 5V is converted into 3.3V by the second voltage conversion unit 342 and the first voltage conversion unit 341 and then is respectively provided for the management unit 21 in the management core 2 and the clock circuit RTC12 in the measurement core 1;
on the other independent branch, when the main power supply 31 is powered on, the fourth voltage conversion unit 344 converts the voltage of the main power supply 31 into 5.6V, and then the voltage is converted into 3.3V by the third voltage conversion unit 343 and is provided to the metering unit 11 of the metering core 1;
the infrared device 22 is directly connected to the cathode of the D4, and when the main power supply 31 is powered on, the fourth voltage conversion unit 344 converts the voltage of the main power supply 31 into 5.6V, and the voltage of the 5.6V is reduced to 5V by the D4 and then provided to the infrared device 22.
The backlight unit 23 and the buzzer 24 are directly connected to the fourth conversion unit 344, and when the main power supply 31 is powered on, the main power supply 31 supplies a voltage of 5.6V to the backlight unit 23 and the buzzer 24;
when the main power supply 31 is powered on, the cathode voltages of D2 and D4 are 5V, and the anode voltages of D1 and D3 are lower than the cathode voltages of D2 and D4, respectively, so D1 and D3 are turned off, thereby preventing the main power supply 31 from charging the clock battery 33 and the stop battery 32.
When the main power supply 31 is powered on, the main power supply 31 supplies power to the clock circuit RTC in the metering core 1 while charging the super capacitor 36.
When the main power supply 31 is powered off, the clock battery 33 supplies power to the clock circuit RTC12 in the metering core 1, and the 3.6V voltage is supplied to the clock circuit RTC12 after passing through the D1 and being converted into 3.3V voltage by the first voltage conversion unit 341;
when the main power supply 31 is powered off, the clock battery 33 supplies power to the clock circuit RTC12 in the metering core 1 and simultaneously charges the super capacitor 36;
when the main power supply 31 is powered off and the clock battery 33 supplies power to the clock circuit RTC12, the cathode voltage of the D2 is higher than the anode voltage, and the D2 is cut off, so that the clock battery 33 is prevented from charging the main power supply 31;
when the main power supply 31 is powered off, the battery 32 stops supplying power to the management unit 21 and the infrared device 22 in the management core 2, the voltage of 6V is converted into the voltage of 4.5V through the fifth voltage conversion unit 345, the voltage is reduced to 4.2V through the third diode D3, one path of the voltage is directly supplied to the infrared device 22, and the other path of the voltage is converted into the voltage of 3.3V through the second voltage conversion unit 342 and then supplied to the management unit 21 in the management core 2;
when the main power supply 31 is powered off, the copy-stopping battery 32 supplies power to the management unit 21 and the infrared device 22 in the management core 2, the cathode voltage of the D4 is higher than the anode voltage, and the D4 is cut off, so that the copy-stopping battery 32 is prevented from charging the main power supply 31;
when the main power supply 31 is powered off, in order to detect events such as power supply abnormality and total voltage loss, the management chip 211 controls the controlled switch 35 to be closed, at this time, the metering unit 11 obtains power supply, the management chip 211 reads metering data from the metering chip 113 to judge whether the external power line is electrified, after the detection is finished, the management chip 211 controls the controlled switch 35 to be opened, and the metering unit 11 stops working.
When the clock battery 33 is replaced, the super capacitor 36 temporarily supplies power to the clock circuit RTC12 in the metering core 1 to ensure the clock accuracy of the metering core 1.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the (device, component, etc.)" are to be interpreted openly as at least one instance of the device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (6)
1. A two-core electric energy meter, characterized in that, two-core electric energy meter includes:
the metering core is composed of a clock circuit RTC and a metering unit and is used for realizing the electric energy metering function;
the management core is used for realizing a non-electric energy metering management function; and
power management control module for the realization carries out independent power supply to measurement core and management core, thereby makes measurement core and management core can independent work, and it includes:
the main power supply is respectively and electrically connected with the metering unit and the clock circuit RTC in the metering core and the management core and is used for respectively supplying power to the metering unit and the clock circuit RTC in the metering core and the management core;
the clock battery is electrically connected with the clock circuit RTC in the metering core and is used for providing power supply to the clock circuit RTC after the power supply is cut off;
the super capacitor is electrically connected with the clock circuit RTC in the metering core and is used for charging the main battery or the clock battery when the main power supply or the clock battery supplies power, and supplying power to the clock circuit RTC by the super capacitor when the main power supply is powered off and the clock battery is undervoltage or the clock battery is replaced;
the copy stopping battery is electrically connected with the management core and is used for providing power to the management core after the main power supply is powered off;
the first diode is connected between the clock battery and the clock circuit RTC in series, the anode is electrically connected with the clock battery, the cathode is electrically connected with the clock circuit RTC, and the first diode is used for preventing the clock battery from providing power supply for the clock circuit RTC when the main power supply is electrified;
the second diode is connected between the main power supply and the first diode in series, the anode of the second diode is electrically connected with the main power supply, the cathode of the second diode is electrically connected with the cathode of the first diode and the clock circuit RTC, and the second diode is used for preventing the clock battery from charging the main power supply when the clock battery works;
the third diode is connected between the stop battery and the management core in series, the anode of the third diode is electrically connected with the stop battery, the cathode of the third diode is electrically connected with the management core, and the third diode is used for preventing the stop battery from providing power supply for the management core when the main power supply is electrified;
the fourth diode is positioned between the main power supply and the management core, the anode of the fourth diode is electrically connected with the main power supply, the cathode of the fourth diode is electrically connected with the cathode of the third diode and the management core, and the fourth diode is used for preventing the copy-stopping battery from charging the main power supply when the copy-stopping battery works; and
the voltage conversion device comprises five voltage conversion units, a first diode, a management core, a second diode, a third diode, a metering unit, a main power supply, a fourth diode, a fifth voltage conversion unit and a fifth voltage conversion unit, wherein the five voltage conversion units are used for converting the voltage of the circuit, the first voltage conversion unit is positioned between the first diode and the super capacitor, the second voltage conversion unit is positioned between the fourth diode and the management core, the third voltage conversion unit is positioned between the second diode and the metering unit, the fourth voltage conversion unit is positioned between the main power supply and the fourth diode, and the fifth.
2. The two-core electric energy meter according to claim 1, wherein the power management control module further comprises a controlled switch, the controlled switch is disposed between the metering unit in the metering core and the cathode of the third diode, and is electrically connected to the management chip in the management core for controlling the opening and closing of the controlled switch, so as to supply power to the metering unit for event detection when the main power supply is powered off.
3. The dual core power meter of claim 1, wherein the management core further comprises a backlight unit, the backlight unit being electrically connected to a main power source.
4. The dual core electric energy meter of claim 1, wherein the management core further comprises a buzzer, the buzzer being electrically connected to a main power source.
5. The dual core electric energy meter of claim 3, wherein the management core further comprises an infrared device electrically connected to the cathode of the fourth diode.
6. The two-core electric energy meter according to claim 5, wherein the power management control module power control method comprises:
when the main power supply is powered on:
an independent branch circuit is used for supplying power to a clock circuit RTC and a super capacitor in the metering core after voltage of the independent branch circuit is reduced by a fourth voltage conversion unit, a second diode and a first voltage conversion unit in sequence;
an independent branch circuit is supplied with power to the metering unit in the metering core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit and the third voltage conversion unit in sequence;
an independent branch circuit is supplied with power to the management unit in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit, the fourth diode and the second voltage conversion unit in sequence;
an independent branch circuit is powered on by an infrared device in the management core after the voltage of the independent branch circuit is reduced by a fourth voltage conversion unit and a fourth diode in sequence;
an independent branch circuit is powered to a backlight unit in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit;
an independent branch circuit is powered to a buzzer in the management core after the voltage of the independent branch circuit is reduced by the fourth voltage conversion unit; and
the main power supply is prevented from charging the clock battery and the copy stopping battery through the cut-off of the first diode and the third diode;
when the main power supply is powered off:
one independent branch is powered by a clock circuit RTC and a super capacitor in the metering core after the voltage of the clock battery is reduced by a first diode and a first voltage conversion unit in sequence;
the independent branch route stop-copy battery is used for supplying power to the management unit in the management core after the voltage of the independent branch route stop-copy battery is reduced by the fifth voltage conversion unit, the third diode and the second voltage conversion unit in sequence, and the management chip in the management unit controls the closing of the controlled switch to supply power to the metering unit in the metering core so as to ensure that the metering chip completes an event detection process;
an independent branch route stop-copy battery sequentially reduces the voltage through a fifth voltage conversion unit and a third diode and then supplies power to an infrared device in the management core;
when the clock battery is replaced, the super capacitor temporarily provides power supply for the RTC in the metering core so as to ensure the accuracy of the clock of the metering core; and
the clock battery and the stop battery are prevented from charging the main power supply through the cut-off of the second diode and the fourth diode.
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| CN201610903410.6A CN106532908B (en) | 2016-10-17 | 2016-10-17 | Double-core electric energy meter and power supply control method thereof |
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| CN108414830A (en) * | 2018-02-05 | 2018-08-17 | 国网江苏省电力有限公司苏州供电分公司 | Twin-core intelligent electric meter with non-invasive powerline road breakdown judge function |
| CN108964245A (en) * | 2018-07-05 | 2018-12-07 | 杭州乾程弘泰电力科技有限公司 | A kind of detection of electric energy meter source and switching device |
| CN109142860A (en) * | 2018-08-22 | 2019-01-04 | 华立科技股份有限公司 | Wireless power electric energy meter |
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