Power supply module capable of efficiently managing battery power consumption and electric energy meter

Abstract

The utility model provides a power supply module capable of efficiently managing battery power consumption and an electric energy meter. The power supply module comprises a VDC output end, a DC-DC conversion circuit, a first switch piece, a second switch piece, a third switch piece and a battery, the VDC output end is connected with the input end of the DC-DC conversion circuit, the output end of the DC-DC conversion circuit is divided into two paths, one path is used as a VDD output end after passing through a first switch piece, and the other path is used as a VCC output end after passing through a second switch piece; the output end of the battery is connected to the VCC output end after passing through the third switch piece; the output end of the VCC is connected with the MCU and the power utilization module which cannot be powered off. According to the utility model, the high-efficiency management of the power consumption of the battery of the electric energy meter can be realized, the cost is lower, the reliability and the stability are higher, and the service life of the battery and the electric energy meter can be greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of power management technology, specifically to a power module and an energy meter for efficient battery power consumption management. Background Technology

[0002] A smart meter is an energy meter with metering functions, enabling remote meter reading, rate control, real-time recording of electricity consumption data, event logging, event reporting, fault diagnosis, and power outage display. Currently, most smart meters on the market are equipped with batteries, which maintain the internal clock, LCD display, event logging, and power outage reporting functions during power outages.

[0003] Since the lifespan of electricity meters is generally over 10 years, and the internal batteries of some electricity meters are fixed to the PCB board and cannot be replaced, it is necessary to reduce battery consumption and extend battery life in order to ensure that the electricity meter can continue to function normally by relying on the battery after a power outage.

[0004] In existing technologies, high-end electricity meters commonly employ a combination of supercapacitors and batteries to reduce battery power consumption. However, in overseas electricity meter markets, the complex environment, numerous technical requirements, and fluctuating customer demands, coupled with the large volume of electricity meter bids leading to stringent cost control requirements—especially for low-end single-phase electricity meters—make cost control even more crucial. Under these circumstances, extensive use of supercapacitors across all meter models would increase costs, rendering the product uncompetitive. Furthermore, significant battery voltage drops during power outages can severely impact the accuracy of the meter's clock, resulting in inaccurate billing rates and incorrect event recording times. Therefore, developing an electricity meter with ultra-low battery power consumption during power outages is particularly important. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a power module and energy meter for efficient management of battery power consumption, which can realize efficient management of power after power failure, and has the advantages of low cost and ensuring stable battery operation.

[0006] To solve the above-mentioned technical problems, the first technical solution adopted by this utility model is as follows:

[0007] A power module for efficient battery power management includes: a V_DC output terminal, a DC-DC conversion circuit, a first switching device, a second switching device, a third switching device, and a battery;

[0008] The V_DC output terminal is connected to the input terminal of the DC-DC converter circuit. The output terminal of the DC-DC converter circuit is divided into two paths: one path passes through the first switch and becomes the VDD output terminal, and the other path passes through the second switch and becomes the VCC output terminal. The output terminal of the battery is connected to the VCC output terminal through the third switch.

[0009] The VCC output terminal is connected to the MCU and the power module that cannot be disconnected from power, respectively.

[0010] Optionally, the first switching element, the second switching element, and the third switching element are dual diodes.

[0011] Optionally, it also includes a mains input terminal, a transformer, and a rectifier circuit connected in sequence; the output terminal of the rectifier circuit includes the V_DC output terminal, a communication voltage output terminal, and an AVDD output terminal;

[0012] The communication voltage output terminal is connected to an external communication module; the AVDD output terminal is connected to an external analog circuit.

[0013] Optionally, the communication voltage output terminal is a V485 output terminal; the communication module is an RS485 circuit.

[0014] Optionally, the analog circuit is a metering circuit.

[0015] The second technical solution provided by this utility model is:

[0016] The electricity meter includes the aforementioned power module for efficient battery power management; it also includes an MCU.

[0017] The battery in the power module includes a detection signal output terminal; the detection signal output terminal is connected to the MCU.

[0018] Optionally, it also includes a memory and a FLASH module; the memory includes a transistor Q3 and a memory chip; the FLASH module includes a transistor Q1, a voltage regulator chip, and a FLASH chip;

[0019] The emitter of transistor Q3 is connected to the VCC output terminal of the power supply module, its base is connected to the EE_Ctrl pin of the MCU, and its collector is connected to the memory chip.

[0020] The emitter of transistor Q1 is connected to the VCC output terminal of the power supply module, its base is connected to the FS_Ctrl pin of the MCU, and its collector is connected to the FLASH chip through the voltage regulator chip.

[0021] The beneficial effects of this invention are as follows: When the mains power supply is normal, the voltage at the output terminal of the DC-DC converter circuit is greater than the voltage output by the battery, which will cause the first and second switches to conduct, and the voltage output by the power module is all provided by the mains power; when the mains power supply is unavailable, the first and second switches are turned off, and the third switch is turned on, and the battery only supplies power to the MCU connected to the VCC output terminal and the power-consuming modules that cannot be disconnected. This invention can achieve efficient battery power consumption management using only a combination of three switches, minimizing battery power consumption and extending battery life; compared with the supercapacitor solution, this invention not only greatly reduces costs, but more importantly, through the optimization of battery power consumption management, it can more accurately control the battery charging and discharging process, reduce energy loss, thereby greatly reducing the probability of battery undervoltage problems, extending battery life while ensuring equipment safety and operational stability. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a power module for efficient battery power consumption management provided in Embodiment 1 of this utility model;

[0023] Figure 2 These are schematic diagrams of the power module structure in the energy meter provided in Embodiments 2 and 3 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the EEPROM in the energy meter provided in Embodiment 3 of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the FLASH module in the energy meter provided in Embodiment 3 of this utility model;

[0026] Figure 5 This is a schematic diagram of the power consumption management process of the energy meter in power-off mode in Embodiment 4 of this utility model;

[0027] Figure 6 This is a schematic diagram of the power management process of the energy meter detecting button wake-up in sleep mode in Embodiment 4 of this utility model.

[0028] Label Explanation:

[0029] 1. Mains input terminal; 2. Transformer; 3. Rectifier circuit; 4. DC-DC converter circuit; 5. Battery;

[0030] 6. First switching element; 7. Second switching element; 8. Third switching element. Detailed Implementation

[0031] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0032] Example 1

[0033] Please refer to Figure 1 This embodiment provides a power module for efficient battery power consumption management.

[0034] like Figure 1 As shown, the power module for efficient battery power management provided in this embodiment includes: mains input terminal 1, transformer 2, rectifier circuit 3, V_DC output terminal, DC-DC conversion circuit 4, first switch 6, second switch 7, third switch 8, and battery 5.

[0035] Specifically, the mains input terminal 1, transformer 2, and rectifier circuit 3 are connected in sequence; the output terminal of the rectifier circuit 3 includes a V_DC output terminal; the V_DC output terminal is connected to the input terminal of the DC-DC converter circuit 4; the output terminal of the DC-DC converter circuit 4 is divided into two paths, one path passes through the first switch 6 to serve as the VDD output terminal, and the other path passes through the second switch 7 to serve as the VCC output terminal; the output terminal of the battery 5 is connected to the VCC output terminal through the third switch 8.

[0036] The voltage output from the DC-DC converter circuit is greater than the voltage output from the battery. The VCC output is connected to both the MCU and a non-disconnectable power supply module.

[0037] In some specific embodiments of this example, the first switch, the second switch, and the third switch are respectively dual diodes D3, D11, and D12. Here, using dual diodes for the on / off control of the three power outputs of the circuit module has the characteristics of high response speed, high reliability, simple structure, and low power consumption, making it more suitable for power-down scenarios and helping to further reduce power consumption.

[0038] Of course, the first, second, and third switching components can also be other components with circuit switching control functions, such as diodes, transistors, MOSFETs, etc., which can be flexibly configured according to the needs of different application scenarios.

[0039] The working principle of this embodiment is as follows:

[0040] After the mains power is transformed by the transformer, it is rectified into a DC power supply V_DC by the rectifier circuit. The DC power supply V_DC is output to the DC-DC converter circuit through the V_DC output terminal. The DC power supply V_DC is converted into the required voltage value by the DC-DC converter circuit and is stably output in two paths. One output of the DC-DC converter circuit is connected to the VDD output terminal through the first switch, which is used to power some non-disconnectable modules of the device when the mains power is normal. The other output is connected to the VCC output terminal through the second switch, which is used to power the MCU and some non-disconnectable power modules of the device when the mains power is normal. The output terminal of the battery BT1 is also connected to the VCC output terminal through the third switch, which is used as the power output of the VCC output terminal to power the MCU and some non-disconnectable power modules of the device when the mains power is unavailable.

[0041] When the mains power supply is normal, the voltage output by the DC-DC converter circuit is greater than the voltage output by the battery. This will cause the first and second switches to be turned on and the third switch to be turned off. The voltages output by the VDD and VCC output terminals are both provided by the output of the DC-DC converter circuit, i.e., the mains power.

[0042] When the mains power supply is unavailable, the first and second switches will be turned off simultaneously, the third switch will be turned on, the VDD output terminal will have no voltage output, and the voltage output by the VCC output terminal will be provided by the battery.

[0043] As described above, the power module provided in this embodiment divides the mains power output into two paths: one is the VDD output terminal, dedicated to powering non-uninterruptible power modules; the other is the VCC output terminal, dedicated to powering the MCU and uninterruptible power modules. Simultaneously, the battery output is connected to the VCC output terminal as a backup power output. The three power outputs of the power module are each controlled by a switch. Under normal mains power supply conditions, since the mains output voltage is greater than the battery output voltage, the two switches connected to the mains output are activated, and both the VDD and VCC output terminals are powered by the mains. In special circumstances where mains power is unavailable, the switches connected to the power output are activated, and the battery output voltage is supplied to the VCC output terminal, providing power only to the uninterruptible power modules, ensuring the device maintains its basic functions.

[0044] As can be seen, the power module provided in this embodiment can achieve efficient management of battery power consumption by rationally allocating the power output and combining the control of three switching components, thereby minimizing battery power consumption and extending battery life. Compared with traditional supercapacitor solutions, this embodiment can not only greatly reduce the cost of the power module, but more importantly, it can also effectively reduce the probability of battery undervoltage problems, extend battery life, and ensure equipment safety and operational stability.

[0045] Example 2

[0046] Please see Figure 2 This embodiment is a further extension of the previous embodiment, applied to the field of electricity meters, to provide a power module for electricity meters that can achieve efficient management of battery power consumption in electricity meters.

[0047] like Figure 2 As shown, the power supply module of the energy meter provided in this embodiment, based on embodiment one, includes the V_DC output terminal (i.e., the output terminal of the rectifier circuit) as described in embodiment one. Figure 2 V_DC in the middle), communication voltage output terminal (i.e. Figure 2 The V_485 and AVDD output terminals (i.e.) Figure 2 (AVDD in the middle).

[0048] The V_DC output terminal is connected to the input terminal of the DC-DC conversion circuit and is used to supply power to the main power consumption module (MCU and peripheral circuits) of the energy meter when the mains power is on (normal power supply).

[0049] In some specific implementations, the aforementioned main power-consuming modules include, but are not limited to, MCU, buttons, infrared, LCD, memory, security modules, LEDs, and relay drivers.

[0050] The communication voltage output terminal is connected to an external communication module to supply power to the communication module in the energy meter when the mains power is on, ensuring the normal operation of the communication module in the energy meter.

[0051] In some specific implementations, such as Figure 2 As shown, the communication voltage output terminal is specifically a V485 output terminal; the communication module is an RS485 circuit.

[0052] The AVDD output terminal is connected to an external analog circuit to supply power to the analog circuit in the energy meter when the mains power is on. This analog circuit in the energy meter includes a metering circuit, an oscillation circuit, etc.

[0053] In some other specific embodiments of this example, such as Figure 2As shown, the output voltage of the DC-DC converter circuit is 5.4V; the output voltage of the battery is 3.6V. When there is mains power, because the DC power converted from mains power is 5.4V, which is higher than the 3.6V voltage supplied by the battery, both the VDD and VCC output terminals are powered by 5.4V. When the power meter loses power, the DC power converted from mains power is lower than the battery power, so the VCC output terminal will be powered entirely by the battery.

[0054] In some specific embodiments of this example, the non-uninterruptible power modules connected to the VDD output terminal include infrared modules, LED modules, safety modules (such as ESAM modules), relays, etc. Because these power modules do not require power during a power outage, they can be deprived of power after a power failure to reduce battery power consumption. Therefore, the power meter module in this example dedicates a separate path (i.e., the VDD output terminal) from the mains power output for independent power supply, distinguishing it from the battery output path which requires a backup power source. This ensures that when the power meter loses power, this output path (i.e., the VDD output terminal) will not be powered by the battery, thereby reducing battery power consumption without affecting the basic functions of the power meter.

[0055] In some specific embodiments, the non-disconnectable power module connected to the VCC output terminal may include an MCU, a button module, an LCD module, a memory, etc. The non-disconnectable power module refers to a power module that requires battery power to ensure normal operation of the electricity meter after a power outage. Here, the power module connected to the VCC output terminal can be flexibly selected according to the different requirements of the electricity meter in different usage scenarios. For example, in some specific application scenarios, it is required that the button function must remain operational after a power outage; therefore, the corresponding button module is a non-disconnectable power module and needs to be configured to connect to the VCC output terminal. Conversely, in other specific application scenarios, there is no such requirement; therefore, the corresponding relay driver, safety module, and infrared module are non-disconnectable power modules that can be disconnected after a power outage and can be configured to connect to the VDD output terminal in this embodiment.

[0056] The power module of the energy meter provided in this embodiment, such as Figure 2 As shown, when the electricity meter receives AC mains power, the mains power will be transformed by a transformer and rectified by a rectifier bridge into three power outputs: V_DC, V485, and AVDD. The V_DC output will then be converted to a stable DC-DC converter and split into two paths. One path passes through the first switching device (…). Figure 2 D3 (shown) serves as the VDD output terminal to power some power-disconnectable modules; another path is through the second switch ( Figure 2D1, as shown, serves as the VCC output to power the MCU and the non-disconnectable power supply modules; specifically, the battery ( Figure 2 The output of BT1 shown will be transmitted through the third switch ( Figure 2 D12 (shown) is also connected to the VCC output. When the mains power supply is normal, the voltage at the output of the DC-DC converter circuit is greater than the voltage output by the battery, which will turn on the first and second switches, and all power modules will be powered by the mains power. When the mains power supply is unavailable, the first and second switches will turn off, the third switch will turn on, and the battery will only power the MCU connected to the VCC output and the power modules that cannot be disconnected.

[0057] The power module of the electricity meter provided in this embodiment can achieve efficient management of the electricity meter's battery power consumption by rationally distributing the power output and combining the control of three switching components. This minimizes the power consumption of the electricity meter's battery and extends its service life. Compared with the traditional supercapacitor solution for electricity meters, this embodiment not only significantly reduces the cost of the electricity meter, but more importantly, it can effectively solve the problem of battery undervoltage during the use of the electricity meter, extending the battery life while ensuring the safety of the electricity meter and the stability of its metering operation.

[0058] Example 3

[0059] Please refer to Figures 2 to 4 This embodiment is a further extension of Embodiment 2, providing an electricity meter.

[0060] This embodiment provides an electricity meter, including as follows: Figure 2 The power module for efficient battery power management described in Embodiment 2 above also includes: Figure 2 The MCU, metering module, communication module, non-power-off module, and non-power-off module are not shown in the diagram.

[0061] The internal structure and connection relationships of the power module, as well as the connection relationships between the power module and the above-mentioned modules, will not be repeated here. For details, please refer to the description in Embodiment 2 above.

[0062] In some specific implementations of this embodiment, such as Figure 2 As shown, the battery BT1 in the power module includes a detection signal output terminal BATCHK; the detection signal output terminal BATCHK is connected to the MCU ( Figure 2 (Not shown in the image) This connection is used by the MCU to monitor the battery voltage in real time. When a battery undervoltage problem is detected, protective measures are taken in time to effectively avoid the impact of battery undervoltage on the energy meter.

[0063] In some further embodiments of this example, the electricity meter also includes an EEPROM memory. For example... Figure 3 As shown, the EEPROM memory includes a transistor Q3 and a memory chip U5; the emitter of the transistor Q3 is connected to the VCC output terminal of the power supply module, its base is connected to the EE_Ctrl pin of the MCU, and its collector is connected to the memory chip U5.

[0064] The working principle of the EEPROM memory is as follows:

[0065] During MCU operation, when the EE_Ctrl pin outputs a high level, transistor Q3 is in the off state, and the VCC output terminal cannot supply power to the memory chip U5 through transistor Q3. When the MCU determines that data read / write operations need to be performed on the EEPROM, it outputs a low level through the EE_Ctrl pin, turning on transistor Q3. Then, the VCC output terminal will supply power to the memory chip U5 through transistor Q3, enabling the memory chip U5 to work normally and complete data read / write operations.

[0066] In some further embodiments of this example, the electricity meter also includes a FLASH module. For example... Figure 4 As shown, the FLASH module includes a transistor Q1, a voltage regulator chip U14, and a FLASH chip U13; the emitter of the transistor Q1 is connected to the VCC output terminal of the power supply module, its base is connected to the FS_Ctrl pin of the MCU, and its collector is connected to the FLASH chip U13 through the voltage regulator chip U14.

[0067] The working principle of the FLASH module is as follows:

[0068] During MCU operation, when the FS_Ctrl pin outputs a high level, transistor Q1 is in the off state. Therefore, the power output from the VCC terminal cannot reach the voltage regulator chip U14 through transistor Q1, thus failing to provide stable power to the FLASH chip U13, and the FLASH chip U13 cannot operate. When the MCU determines that data read / write operations are needed for the FLASH module, it outputs a low level through the FS_Ctrl pin, turning on transistor Q1. Then, the VCC output can reach the voltage regulator chip U14 through transistor Q1, providing stable power to the FLASH chip U13, enabling the FLASH chip U13 to operate normally and complete data read / write operations.

[0069] As described above, the energy meter provided in this embodiment has a transistor corresponding to both the memory and the FLASH module. The MCU controls the transistors to turn off and output power to the memory and FLASH module, thereby enabling power supply to the memory and FLASH module only when necessary to ensure normal storage operation. When read / write operations are not required, the power supply to the memory and FLASH module is turned off, effectively reducing the static power consumption of the energy meter. In addition, it can be understood that since the VCC output is completely powered by the battery when the energy meter loses power, the power management for the memory and FLASH module can also effectively reduce battery power consumption.

[0070] The energy meter provided in this embodiment can efficiently manage battery power consumption, minimizing battery power consumption and extending battery life. Compared to the supercapacitor solution in traditional energy meters, this embodiment not only significantly reduces the cost of the energy meter, but more importantly, it effectively solves the battery undervoltage problem during the use of the energy meter, extending battery life while ensuring the safety and stability of the metering operation. Furthermore, by optimizing the power control of its memory and FLASH modules, the static power consumption of the battery can be further reduced.

[0071] Example 4

[0072] This embodiment further extends the above-described embodiment three, providing a power control method for an electricity meter. The power control method in this embodiment is implemented based on the electricity meter described in embodiment three. The structure and connection relationships of the electricity meter will not be repeated here; please refer to the description in embodiment three for details.

[0073] The power control method for the electricity meter provided in this embodiment is as follows:

[0074] When the mains power supply is normal, the voltage output by the DC-DC converter circuit is greater than the voltage output by the battery, which will cause the first switch and the second switch to conduct, and the voltages output by the VDD and VCC output terminals in the power module are both provided by the mains power.

[0075] When the mains power supply is unavailable, the first and second switches are turned off, the third switch is turned on, and the voltage output from the VCC output terminal in the power module is provided by the battery.

[0076] When the MCU is running, by controlling its EE_Ctrl pin and its FS_Ctrl pin, the transistor Q3 of the memory and the transistor Q1 of the FLASH module are both turned off, thereby cutting off the power supply to the memory chip and the FLASH chip.

[0077] When there is a need to read or write to the memory or FLASH module, the MCU controls its EE_Ctrl pin and its FS_Ctrl pin to turn on the transistor Q3 of the memory and the transistor Q1 of the FLASH module, thereby restoring the power supply to the memory chip and the FLASH chip.

[0078] In some specific implementations, the MCU only performs the aforementioned power control of the memory and FLASH modules when mains power is unavailable. That is, when powered by battery, the memory and FLASH modules are only powered by the battery when read / write operations are required, thereby effectively reducing the battery power consumption of the electricity meter.

[0079] The power control method of the electricity meter in this embodiment utilizes the combined control of three switching components to achieve efficient battery power consumption management, minimize battery power consumption, and extend battery life. Compared with the supercapacitor solution, it can not only greatly reduce the cost of the electricity meter, but also effectively reduce the probability of battery undervoltage problems, extend battery life, and ensure equipment safety and operational stability.

[0080] In some further embodiments of this example, the power control method of the electricity meter will be further optimized for the display function of the electricity meter.

[0081] The power control method for the electricity meter also includes:

[0082] When the mains power is unavailable, the MCU controls the power supply to shut down the LCD display and the internal display module. The LCD display will only be turned on when external power is detected (i.e., when the mains power is restored) or after being activated by a button.

[0083] Preferably, if a button is detected to wake the device during the power-off mode of the energy meter but there is no continuous button operation, the MCU will control the LCD display to cycle through the items and then turn off the LCD display; if no button operation is detected within a preset time period (e.g., 60 seconds) after the button is woken up, the MCU will control the LCD display to turn off. This minimizes the battery power consumption caused by the display function after a power outage.

[0084] Please refer to the following. Figure 5 and Figure 6 This embodiment will describe in detail the power control method of an electricity meter through two preferred specific implementation methods:

[0085] like Figure 5 As shown, the power consumption management process of the electricity meter in power-down mode includes:

[0086] When the energy meter detects a power outage, it immediately enters a power outage loop program. First, it switches to a low-speed clock, i.e., reduces the clock rate. At the same time, it shuts down the power supplies for the display module, peripheral circuits, metering module, infrared module, EEPROM, and FLASH. In other words, all power-consuming modules connected to the VDD output of the power module are turned off. Meanwhile, the power-consuming modules connected to the VCC output of the power module are powered by batteries. In addition, the RTC wake-up time is extended, such as by configuring the RTC wake-up function to "hourly wake-up". After that, the energy meter enters sleep mode.

[0087] When the energy meter enters deep sleep mode, its power consumption is reduced to 3uA. Upon waking, the energy meter checks for interrupt sources. If the wake-up is due to a power interrupt, it proceeds to determine whether the energy meter is powered on. If the wake-up is due to an RTC interrupt, it performs temperature compensation on the RTC based on the current detected temperature at preset time intervals to ensure the accuracy of the clock module, before proceeding to the same step. If the wake-up is due to a button interrupt, the display module is turned on; if the interrupt is due to a cover opening button, the cover opening event is recorded, before proceeding to the same step. The power-on determination process includes: determining whether the energy meter is powered on; if so, switching to power-on mode; otherwise, reverting to sleep mode.

[0088] like Figure 6 As shown, the power management process for the energy meter to detect button wake-up in sleep mode includes:

[0089] When the energy meter detects a button wake-up operation in sleep mode, it will turn on the display module and change the RTC hour wake-up mode to RTC second wake-up mode to ensure accurate calculation of the remaining display time of the LCD. Then, it will continuously check whether the energy meter is powered on. If it is powered on, it will jump to the power-on mode. Otherwise, it will continue to complete the LCD display function and then re-enter sleep mode.

[0090] The power control method for the electricity meter provided by the two preferred embodiments described above can achieve efficient management of battery power consumption in the electricity meter by optimizing power management after power failure, thereby minimizing battery power consumption and improving battery life in the electricity meter.

[0091] It is understood that the power control methods for electricity meters provided in the two preferred embodiments described above can be implemented by the MCU on the electricity meter executing a corresponding computer program and instructing related hardware. The program can be stored in a computer-readable storage medium. When executed by the MCU on the electricity meter, the program can include the processes described above. After execution by the MCU on the electricity meter, the program can also achieve the beneficial effects of the corresponding methods.

[0092] In summary, the power module, energy meter, and power management method for efficient battery power consumption management provided by this utility model have the following advantages:

[0093] 1. Improve the efficiency of batteries in electricity meters while saving research and development costs;

[0094] 2. Reduce the static power consumption of the battery in the electricity meter;

[0095] 3. Improve the lifespan of batteries in electricity meters;

[0096] 4. Effectively reduces the probability of battery undervoltage problems during the use of the electricity meter.

[0097] 5. Effectively solves the problem of the meter's clock accuracy being affected by low battery voltage.

[0098] It is evident that the power module, energy meter, and power management method for efficient battery power consumption management provided by this utility model are lower in cost and more reliable and stable than traditional battery power consumption management methods, and can greatly extend the service life of the battery and energy meter.

[0099] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A power module with efficient battery power consumption management, characterized in that, include: V_DC output terminal, DC-DC conversion circuit, first switch, second switch, third switch and battery; The V_DC output terminal is connected to the input terminal of the DC-DC converter circuit. The output terminal of the DC-DC converter circuit is divided into two paths: one path passes through the first switch and becomes the VDD output terminal, and the other path passes through the second switch and becomes the VCC output terminal. The output terminal of the battery is connected to the VCC output terminal through the third switch. The VCC output terminal is connected to the MCU and the power module that cannot be disconnected from power, respectively.

2. The power module for efficient battery power management as described in claim 1, characterized in that, The first switching element, the second switching element, and the third switching element are dual diodes.

3. The power module for efficient battery power management as described in claim 1, characterized in that, It also includes a mains input terminal, a transformer, and a rectifier circuit connected in sequence; the output terminal of the rectifier circuit includes the V_DC output terminal, a communication voltage output terminal, and an AVDD output terminal. The communication voltage output terminal is connected to an external communication module; the AVDD output terminal is connected to an external analog circuit.

4. The power module for efficient battery power management as described in claim 3, characterized in that, The communication voltage output terminal is a V485 output terminal; the communication module is an RS485 circuit.

5. The power module for efficient battery power management as described in claim 3, characterized in that, The analog circuit is a metering circuit.

6. An electricity meter, characterized in that, The power module includes the battery power consumption high-efficiency management as described in any one of claims 1 to 5; and also includes an MCU; The battery in the power module includes a detection signal output terminal; the detection signal output terminal is connected to the MCU.

7. The electricity meter as described in claim 6, characterized in that, It also includes a memory and a FLASH module; the memory includes a transistor Q3 and a memory chip; the FLASH module includes a transistor Q1, a voltage regulator chip, and a FLASH chip; The emitter of transistor Q3 is connected to the VCC output terminal of the power supply module, its base is connected to the EE_Ctrl pin of the MCU, and its collector is connected to the memory chip. The emitter of transistor Q1 is connected to the VCC output terminal of the power supply module, its base is connected to the FS_Ctrl pin of the MCU, and its collector is connected to the FLASH chip through the voltage regulator chip.

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