CN218099572U - Power-down communication device and system for electric energy meter - Google Patents
Power-down communication device and system for electric energy meter Download PDFInfo
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- CN218099572U CN218099572U CN202222270036.4U CN202222270036U CN218099572U CN 218099572 U CN218099572 U CN 218099572U CN 202222270036 U CN202222270036 U CN 202222270036U CN 218099572 U CN218099572 U CN 218099572U
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Abstract
The utility model provides a power-down communication device and a system for an electric energy meter, wherein the device is applied to the electric energy meter, and an MCU of the electric energy meter is connected with an MC171 interface of the electric energy meter; the device comprises: the device comprises a signal conversion circuit, a boosting circuit and a voltage reduction circuit; the signal conversion circuit is respectively connected with the MC171 interface and the USB interface of the upper computer; the booster circuit is respectively connected with the MC171 interface and the USB interface; the voltage reduction circuit is respectively connected with the MC171 interface and the USB interface. Adopt the utility model discloses can realize the electric energy meter and fall the communication that falls.
Description
Technical Field
The utility model belongs to the technical field of the electric energy meter technique and specifically relates to a power down communication device and system of electric energy meter is related to.
Background
Under the condition that the existing electric energy meter is not connected into a power grid or the power grid is powered off, common communication modules (such as a 485 communication module, a near infrared communication module, an MBUS communication module, a PLC module, a GPRS module and the like) in the electric energy meter cannot be used. Therefore, under the condition that the electric energy meter is not connected to a power grid or the power grid is powered off, the power bureau generally cannot read data such as electric quantity, demand and event records in the electric energy meter, and cannot realize power-down communication of the electric energy meter, so that the requirement for detecting the electric energy meter under the condition cannot be met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electric energy meter falls electric communication device and system to realize that the electric energy meter falls the electric communication.
In a first aspect, the utility model provides a power-down communication device for an electric energy meter, which is applied to the electric energy meter, wherein the MCU of the electric energy meter is connected with the MC171 interface of the electric energy meter; the device comprises: the voltage boosting circuit comprises a signal conversion circuit, a voltage boosting circuit and a voltage reducing circuit; the signal conversion circuit is respectively connected with the MC171 interface and the USB interface of the upper computer; the booster circuit is respectively connected with the MC171 interface and the USB interface; the voltage reduction circuit is respectively connected with the MC171 interface and the USB interface.
As one possible implementation, the signal conversion circuit includes a signal conversion chip; the signal conversion chip comprises a data pin and a UART signal pin; the data pin is connected with a USB signal pin of the USB interface; the UART signal pin is connected with a UART pin of the MC171 interface.
As a possible implementation, the boost circuit includes a boost chip; the boost chip comprises a first voltage input pin and a first voltage output pin; the first voltage input pin is connected with a first power supply pin of the USB interface; the first voltage output pin is connected to a second power supply pin of the MC171 interface.
As a possible implementation, the voltage-reducing circuit includes a voltage-reducing chip; the voltage reduction chip comprises a second voltage input pin and a second voltage output pin; the second voltage input pin is connected with a first power supply pin of the USB interface; the voltage output pin is connected with a third power supply pin of the MC171 interface; and the power supply voltage corresponding to the third power supply pin is less than the power supply voltage corresponding to the second power supply pin.
As a possible implementation, the apparatus further includes an interface circuit, which is respectively connected to the signal conversion circuit, the voltage boost circuit, the voltage step-down circuit, and the MC171 interface.
As a possible implementation, the interface circuit includes a first pin and a first diode; the cathode of the first diode is connected with the first pin; the anode of the diode is connected with the first voltage output pin; the first pin is connected with the second power supply pin.
As a possible implementation, the interface circuit includes a second pin and a first resistor; the first resistor is respectively connected with the second pin and the second voltage output pin; the second pin is connected to a power state detection pin of the MC171 interface.
As a possible implementation, there are two UART signal pins; the number of the UART pins is two; the interface circuit comprises two third pins and two second resistors; each second resistor is respectively connected with one third pin and one UART signal pin; and each third pin is correspondingly connected with different UART pins.
As a possible implementation, the interface circuit includes a fourth pin; the fourth pin is connected with the third power supply pin.
In a second aspect, the utility model provides an electric energy meter power-down communication system, which comprises the electric energy meter power-down communication device and an upper computer; the device is connected with a USB interface of the upper computer.
The utility model provides a power-down communication device and a system for an electric energy meter, which are applied to the electric energy meter, wherein an MCU of the electric energy meter is connected with an MC171 interface of the electric energy meter; the device includes: the voltage boosting circuit comprises a signal conversion circuit, a voltage boosting circuit and a voltage reducing circuit; the signal conversion circuit is respectively connected with the MC171 interface and the USB interface of the upper computer; the booster circuit is respectively connected with the MC171 interface and the USB interface; the voltage reduction circuit is respectively connected with the MC171 interface and the USB interface. By adopting the technology, under the condition that the electric energy meter is not connected to a power grid or the power grid is cut off, the USB interface of the upper computer provides power for normal work of the electric energy meter, and the power bureau staff can read data such as electric quantity, demand, event record, load curve and the like in the electric energy meter through the upper computer, so that power-down communication of the electric energy meter can be realized, and the requirement for detecting the electric energy meter under the condition is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram illustrating an example of the functional descriptions of the pins of the MC171 interface of a conventional power meter;
fig. 2 is a schematic structural diagram of an electric energy meter power-down communication device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another power down communication device for an electric energy meter according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an exemplary signal conversion circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an exemplary embodiment of the boost circuit of the present invention;
fig. 6 is a circuit diagram of an exemplary embodiment of the voltage reduction circuit;
fig. 7 is a circuit diagram of an exemplary interface circuit according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Under the condition that the existing electric energy meter is not connected into a power grid or the power grid is powered off, common communication modules (such as a 485 communication module, a near infrared communication module, an MBUS communication module, a PLC module, a GPRS module and the like) in the electric energy meter cannot be used. Therefore, under the condition that the electric energy meter is not connected to a power grid or the power grid is cut off, the power bureau cannot generally read data such as electric quantity, demand and event records in the electric energy meter, and cannot realize power-down communication of the electric energy meter, so that the requirement for detecting the electric energy meter under the condition cannot be met. Based on this, the embodiment of the utility model provides an electric energy meter falls electric communication device and system can realize that the electric energy meter falls the electricity communication.
For ease of understanding, the pin functions of the MC171 interface of the prior art power meter will be described first. Referring to fig. 1, an MC171 interface (i.e., an MC171 standard interface) of the conventional electric energy meter includes pins No. 1 to 8; the No. 1 pin is a reserved pin and is only used for expanding the functions of the electric energy meter, and the electric energy meter does not perform signal interaction through the pin when in normal work; the No. 2 pin is a data sending pin (a UART pin), the electric energy meter can send UART signals outwards through the pin when working normally, and the default state of the pin is high level when the electric energy meter works normally; the No. 3 pin is a data receiving pin (another UART pin), the electric energy meter can receive external UART signals through the pin when in normal work, and the default state of the pin is high level when in normal work; the No. 4 pin is a power supply state detection pin, and the power supply state of the electric energy meter can be detected through the pin when the electric energy meter works normally (namely whether the electric energy meter is powered down or not is detected); the No. 5 pin is a public ground pin, and the default state of the pin is grounding when the electric energy meter works normally; the No. 6 pin is a system power supply pin, the pin is connected with an MCU (microprogrammed control unit) of the electric energy meter, the electric energy meter can receive external 3.3V power supply voltage through the pin to supply power for the MCU of the electric energy meter when in normal work, and the default state of the pin is +3.3V when in normal work; the No. 7 pin is a +12V pin, the electric energy meter can receive external 12V power supply voltage through the pin to supply power to the electric energy meter when in normal work, and the default state of the pin is +12V when the electric energy meter works normally; the No. 8 pin is a pin without function definition, and the electric energy meter does not perform signal interaction through the pin in normal operation.
Based on the structure of the MC171 interface, referring to the schematic structural diagram of the power-down communication device for the electric energy meter shown in fig. 2, the power-down communication device for the electric energy meter is applied to the electric energy meter, and the MCU201 of the electric energy meter is connected with the MC171 interface 202 of the electric energy meter; the apparatus may include: a signal conversion circuit 101, a voltage boost circuit 102, and a voltage step-down circuit 103; the signal conversion circuit 101 is respectively connected with the MC171 interface 202 and the USB interface 301 of the upper computer; the boost circuit 102 is connected to the MC171 interface 202 and the USB interface 301, respectively; the voltage step-down circuit 103 is connected to the MC171 interface 202 and the USB interface 301, respectively.
The signal conversion circuit 101 is configured to convert a USB signal of an upper computer into a UART signal, so as to implement UART signal interaction between the power-down communication device of the electric energy meter and the electric energy meter; the booster circuit 102 is configured to boost an initial power supply voltage provided by the upper computer to a working voltage required by the electric energy meter when the electric energy meter is powered down; the voltage reduction circuit 103 is used for reducing the initial power voltage provided by the upper computer to the working voltage required by the MCU201 when the power down of the electric energy meter occurs.
The utility model provides a power-down communication device for an electric energy meter, which is applied to the electric energy meter, wherein an MCU of the electric energy meter is connected with an MC171 interface of the electric energy meter; the device comprises: the voltage boosting circuit comprises a signal conversion circuit, a voltage boosting circuit and a voltage reducing circuit; the signal conversion circuit is respectively connected with the MC171 interface and the USB interface of the upper computer; the booster circuit is respectively connected with the MC171 interface and the USB interface; the voltage reduction circuit is respectively connected with the MC171 interface and the USB interface. By adopting the technology, under the condition that the electric energy meter is not connected to a power grid or the power grid is cut off, the USB interface of the upper computer provides power for normal work of the electric energy meter, and the power bureau staff can read data such as electric quantity, demand, event record, load curve and the like in the electric energy meter through the upper computer, so that power-down communication of the electric energy meter can be realized, and the requirement for detecting the electric energy meter under the condition is met.
As a possible implementation, the signal conversion circuit 101 may include a signal conversion chip; the signal conversion chip can comprise a data pin and a UART signal pin; the data pin is connected with the USB signal pin of the USB interface 301; the UART signal pin is connected to the UART pin of the MC171 interface 202.
The specific type of the signal conversion chip can be selected according to actual needs, and is not limited.
For example, as shown in fig. 4, the signal conversion chip adopts a CP2102 chip U1, where U1 includes pins 0 to 28, pins 4 and 5 of U1 are data pins D + and D ", respectively, and pins 25 and 26 of U1 are UART signal pins TXD and RXD, respectively; the USB interface of the upper computer comprises pins 1-4, a pin D-2 of the USB interface is connected with a pin D + 4 of the U1 through a resistor R1, a pin D +3 of the USB interface is connected with a pin D-5 of the U1 through a resistor R2, a pin 25 of the U1 is connected with a data sending pin (namely, the pin 2 in the figure 1) of the MC171 interface of the electric energy meter through a resistor R5, and a pin 26 of the U1 is connected with a data receiving pin (namely, the pin 3 in the figure 1) of the MC171 interface of the electric energy meter through a resistor R4. The USB signal of the upper computer is connected with the pins D + and D + 4 and 5 of the U1 through the pins D & lt- & gt and D & lt- & gt 2 and 3 of the USB interface by the resistors R1 and R2, the USB signal of the upper computer is converted into a pair of UART signals (comprising an input signal and an output signal) by the U1 and the peripheral devices (namely R4, R5, R3, R1, R2, C1 and C2), the pair of UART signals are connected with the pins 2 and 3 of the interface of the electric energy meter MC171 through the pins IR _ TXD and IR _ RXD 25 and 26 of the U1 by the resistors R5 and R4, and the pins 2 and 3 of the interface of the electric energy meter MC171 are generally directly connected with the UART interface of the main chip of the electric energy meter. By adopting the circuit structure shown in fig. 4, the USB signal of the upper computer can be converted into a UART signal, and the UART signal interaction between the power-down communication device of the electric energy meter and the electric energy meter is realized.
As a possible implementation, the boosting circuit 102 may include a boosting chip; the boost chip comprises a first voltage input pin and a first voltage output pin; the first voltage input pin is connected with the first power supply pin of the USB interface 301; the first voltage output pin is coupled to a second power supply pin of the MC171 interface 202.
The specific type of the boost chip can be selected according to actual needs, and is not limited.
For example, as shown in fig. 5, the SGM6607 chip V2 is adopted in the boost chip, where V2 includes pins 1 to 6, pin 1 of V2 is a first voltage input pin Vin, and pin 6 of V2 is a first voltage output pin fb; the USB interface of the upper computer comprises pins 1 to 4, the pin 1 VBUS of the USB interface is connected with the pin 1 Vin of the V2, and the pin 6 of the V2 is connected with the +12V pin (namely, the second power supply pin, namely, the pin 7 in the figure 1) of the MC171 interface of the electric energy meter through the resistors R12 and R13.
When the electric energy meter is powered off, the devices V2, L6, D7, R12, R13, R10, C7, R11, R14 and C8 form a DCDC booster circuit, 5V voltage output by a No. 5 pin VBUS of the USB interface of the upper computer is connected with a No. 1 pin Vin of the V2, and the DCDC booster circuit raises (namely boosts) the 5V voltage to a +12V power supply VCC _ +12V which is provided for a No. 7 pin of an MC171 interface of the electric energy meter, so that a +12V power supply voltage is provided for the electric energy meter to ensure normal operation of the electric energy meter.
As a possible implementation, the voltage reducing circuit 103 may include a voltage reducing chip; the voltage reduction chip comprises a second voltage input pin and a second voltage output pin; the second voltage input pin is connected with the first power supply pin of the USB interface 301; the voltage output pin is connected to the third power supply pin of the MC171 interface 202;
and the power supply voltage corresponding to the third power supply pin is less than the power supply voltage corresponding to the second power supply pin. For example, the power supply voltage corresponding to the third power supply pin is 3.3V, and the power supply voltage corresponding to the second power supply pin is 12V.
The specific type of the voltage reduction chip can be selected according to actual needs, and is not limited.
For example, as shown in fig. 6, the buck chip is an LDO chip U2, where U2 includes pins 0 to 3, pin 3 of U2 is a second voltage input pin Vin, and pin 1 of U2 is a second voltage output pin Vout; the USB interface of the upper computer includes pins 1 to 4, pin VBUS 1 of the USB interface is connected to pin Vin 3 of U2, and pin Vout 1 of U2 is connected to a system power pin (i.e., the third power pin, i.e., pin 6 in fig. 1) of the MC171 interface of the electric energy meter through a diode D8.
When the electric energy meter is powered off, the device U2, the device D8, the device C5, the device C4 and the device C3 form an LDO step-down circuit, 5V voltage output by a No. 5 pin VBUS of an upper computer USB interface is connected with a No. 3 pin Vin of the U2, and the LDO step-down circuit converts (namely steps down) the 5V voltage to +3.3V power and provides the +3.3V power for a No. 6 pin of an electric energy meter MC171 interface, so that the +3.3V power voltage is provided for the electric energy meter to ensure that an MCU of the electric energy meter works normally; wherein, the device C4 is a filter capacitor of the input voltage VBUS; wherein, the devices C3 and C5 are filter capacitors with output voltage +3.3V; the device D8 is a Schottky diode and can prevent the U2 from being damaged by current recoil.
As a possible implementation manner, referring to fig. 3, the above power down communication device for an electric energy meter may further include an interface circuit 104, which is respectively connected to the signal conversion circuit 101, the voltage boost circuit 102, the voltage step-down circuit 103, and the MC171 interface 202. The interface circuit 104 can provide a hardware interface for the electric energy meter power-down communication device to be in butt joint with an electric energy meter MC171 interface, so that the adaptability between the electric energy meter power-down communication device and the original structure of the electric energy meter is improved.
As a possible implementation, the interface circuit 104 may include a first pin and a first diode; the cathode of the first diode is connected with the first pin; the anode of the diode is connected with the first voltage output pin; the first pin is connected with the second power supply pin.
For example, as shown in fig. 5 and 7, the interface circuit includes pins 1 to 8 and devices R7, R8, R6, and D5, pin 7 of the interface circuit is the first pin, device D5 of the interface circuit is the first diode, the cathode of D5 is connected to pin 7 of the interface circuit, and the anode of D5 is connected to Vout in fig. 5; pin 7 of the interface circuit is connected to pin +12V (i.e., the second power supply pin, i.e., pin 7 in fig. 1) of the interface of the power meter MC 171. Aiming at the situation that the electric energy meter is connected with both the mains supply and the power-down communication device of the electric energy meter, if the 12V power supply of the electric energy meter happens to have high voltage and backflush to the power-down communication device of the electric energy meter at the moment, the possibility of damaging the chip V2 in the figure 5 is possible; therefore, the device D5 can effectively prevent the electric energy meter from current recoil damage to the electric energy meter power-down communication device under the condition that the electric energy meter is connected to both the mains supply of a power grid and the electric energy meter power-down communication device.
As a feasible example, the device D5 in fig. 7 may specifically employ a schottky diode LBAT54HT1G, which can resist a reverse surge voltage of 30V, and due to the presence of the device D5, even if the electric energy meter is connected to both the commercial power and the electric energy meter power-down communication device, and the 12V power of the electric energy meter fluctuates, the electric energy meter power-down communication device will not be damaged as long as the reverse surge voltage does not exceed 30V.
As a possible implementation, the interface circuit 104 may include a second pin and a first resistor; the first resistor is respectively connected with the second pin and the second voltage output pin; the second pin is connected to the power state detection pin of the MC171 interface.
For example, as shown in fig. 6 and 7, the interface circuit includes pins 1 to 8 and devices R7, R8, R6, and D5, pin 4 of the interface circuit is the second pin, device R6 of the interface circuit is the first resistor, and R6 is respectively connected to pin 4 of the interface circuit and pin Vout No. 1 (i.e., the second voltage output pin) of U2 in fig. 6; pin No. 4 of the interface circuit is connected to a power state detection pin (i.e., pin No. 4 in fig. 1) of the interface of the power meter MC 171. The device R6 is used for providing a +3.3V power supply for power supply state detection of the electric energy meter, so that the electric energy meter can recognize that the electric energy meter power-down communication device is connected without connecting to a mains supply, and malicious communication is prevented.
Usually, only the staff of the power bureau or the staff authorized by the power bureau can read the data in the electric energy meter through the MC171 interface at the meter end, but sometimes, non-staff tries to read and modify the data in the electric energy meter by connecting the power-down communication device of the electric energy meter with the MC171 interface of the electric energy meter, in order to prevent the malicious behavior, it may be defined that the power-down communication device of the electric energy meter is allowed to read and modify the data in the electric energy meter only when the chip of the electric energy meter recognizes the high level of pin 4 of the MC171 interface.
As a possible implementation, there are two UART signal pins; the number of the UART pins is two; the interface circuit 104 may include two third pins and two second resistors; each second resistor is respectively connected with a third pin and a UART signal pin; and each third pin is correspondingly connected with different UART pins.
For example, as shown in fig. 4 and 7, the interface circuit includes pins 1 to 8 and devices R7, R8, R6, and D5, the pin 2 and the pin 3 of the interface circuit are the third pins, the devices R7 and R8 of the interface circuit are the second resistors, R7 is connected to the pin 2 of the interface circuit and the pin 26 IR _ RXD (i.e., one UART signal pin) of U1 in fig. 4, respectively, R8 is connected to the pin 3 of the interface circuit and the pin 25 IR _ D (i.e., another UART signal pin) of U1 in fig. 4, respectively, and the pin 2 and the pin 3 of the interface circuit are connected to the pin 3 and the pin 2 of the MC171 interface, respectively. The reserved resistors designed for subsequent debugging of the devices R7 and R8 can be deleted or reserved according to requirements in practical application.
As a possible implementation, the interface circuit 104 may include a fourth pin; the fourth pin is connected with the third power supply pin.
For example, in fig. 4 and 7, the interface circuit includes pins 1 to 8 and devices R7, R8, R6, and D5, the pin 1 of the interface circuit is the fourth pin, and the pin 1 of the interface circuit is connected to the pin 6 (i.e., the third power supply pin) of the interface of the electric energy meter MC171 in fig. 1. When the electric energy meter is powered off, the electric energy meter power-off communication device can provide +3.3V voltage for the No. 6 pin of the MC171 interface of the electric energy meter through the No. 1 pin of the interface circuit, so that +3.3V power supply voltage is provided for the electric energy meter to ensure the normal work of the MCU of the electric energy meter.
Based on the power-down communication device for the electric energy meter, the embodiment of the utility model also provides a power-down communication system for the electric energy meter, which can comprise the power-down communication device for the electric energy meter and an upper computer; the device is connected with a USB interface of an upper computer.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The power-down communication device for the electric energy meter is characterized in that the device is applied to the electric energy meter, and an MCU of the electric energy meter is connected with an MC171 interface of the electric energy meter; the device comprises: the voltage boosting circuit comprises a signal conversion circuit, a voltage boosting circuit and a voltage reducing circuit; the signal conversion circuit is respectively connected with the MC171 interface and the USB interface of the upper computer; the boosting circuit is respectively connected with the MC171 interface and the USB interface; the voltage reduction circuit is respectively connected with the MC171 interface and the USB interface.
2. The power-down communication device for the electric energy meter according to claim 1, wherein the signal conversion circuit comprises a signal conversion chip; the signal conversion chip comprises a data pin and a UART signal pin; the data pin is connected with a USB signal pin of the USB interface; the UART signal pin is connected to a UART pin of the MC171 interface.
3. The power-down communication device for the electric energy meter according to claim 2, wherein the boost circuit comprises a boost chip; the boost chip comprises a first voltage input pin and a first voltage output pin; the first voltage input pin is connected with a first power supply pin of the USB interface; the first voltage output pin is connected to a second power supply pin of the MC171 interface.
4. The power-down communication device for the electric energy meter according to claim 3, wherein the voltage reduction circuit comprises a voltage reduction chip; the voltage reduction chip comprises a second voltage input pin and a second voltage output pin; the second voltage input pin is connected with a first power supply pin of the USB interface; the voltage output pin is connected with a third power supply pin of the MC171 interface;
and the power supply voltage corresponding to the third power supply pin is less than the power supply voltage corresponding to the second power supply pin.
5. The device for communicating loss of power to an electric energy meter of claim 4, further comprising an interface circuit for interfacing with the signal conversion circuit, the voltage boost circuit, the voltage buck circuit and the MC171 respectively.
6. The power down communication device for an electric energy meter according to claim 5, wherein the interface circuit comprises a first pin and a first diode; the cathode of the first diode is connected with the first pin; the anode of the diode is connected with the first voltage output pin; the first pin is connected with the second power supply pin.
7. The device for power down communication of an electric energy meter according to claim 5, wherein the interface circuit comprises a second pin and a first resistor; the first resistor is respectively connected with the second pin and the second voltage output pin; the second pin is connected to a power state detection pin of the MC171 interface.
8. The power-down communication device for the electric energy meter according to claim 5, wherein the UART signal pins are two; the number of the UART pins is two; the interface circuit comprises two third pins and two second resistors; each second resistor is respectively connected with one third pin and one UART signal pin; and each third pin is correspondingly connected with different UART pins.
9. The device for power down communication of an electric energy meter according to claim 5, wherein the interface circuit comprises a fourth pin; the fourth pin is connected with the third power supply pin.
10. A power-down communication system for an electric energy meter, which is characterized by comprising the power-down communication device for the electric energy meter and an upper computer according to any one of claims 1-9; the device is connected with a USB interface of the upper computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222270036.4U CN218099572U (en) | 2022-08-26 | 2022-08-26 | Power-down communication device and system for electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222270036.4U CN218099572U (en) | 2022-08-26 | 2022-08-26 | Power-down communication device and system for electric energy meter |
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| CN218099572U true CN218099572U (en) | 2022-12-20 |
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| CN202222270036.4U Active CN218099572U (en) | 2022-08-26 | 2022-08-26 | Power-down communication device and system for electric energy meter |
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- 2022-08-26 CN CN202222270036.4U patent/CN218099572U/en active Active
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