Power supply module for efficient management of battery power consumption, electric energy meter and power supply management method thereof

Abstract

The invention provides a power supply module capable of efficiently managing battery power consumption, an electric energy meter and a power supply management method thereof. 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 invention, 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] The present invention relates to the technical field of power management, and in particular to a power module for efficiently managing battery power consumption, an electric energy meter, and a power management method thereof. Background Art

[0002] A smart energy meter is a meter with metering capabilities, enabling remote meter reading, rate control, real-time recording of electricity usage data, event logging and reporting, fault diagnosis, and power outage notification. Currently, all energy meters on the market contain batteries, which, when a power outage occurs, maintain the internal clock, LCD display, event logging, and power outage notification functions.

[0003] Since energy meters typically have a service life of more than 10 years, and some have internal batteries fixed to the PCB and cannot be replaced, reducing battery consumption and extending battery life is crucial to ensure the meter can maintain its necessary functions after a power outage.

[0004] In the existing technology, a common practice for high-end electricity meters is to reduce battery energy loss through a combination of supercapacitors and batteries. In the overseas electricity meter market, due to its complex environment, numerous technical requirements, various unstable technical requirements of customers, and the large number of electricity meter bids, cost and price control requirements are high; especially for low-end single-phase electricity meters, cost and price control is more stringent. In this case, if all meter types use a large number of supercapacitors, it will increase costs and result in the product having no competitive advantage. In addition, if the battery is severely undervoltage during a power outage, it will seriously affect the accuracy of the meter clock, resulting in inaccurate meter billing rates and incorrect event recording time. Therefore, it is particularly important to develop an electricity meter with ultra-low power consumption when the battery is powered off. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a power module, an electric energy meter and a power management method thereof 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] In order to solve the above technical problems, the first technical solution adopted by the present invention is:

[0007] A power module for efficient battery power consumption management, comprising: a V_DC output terminal, a DC-DC conversion circuit, a first switch element, a second switch element, a third switch element, and a battery;

[0008] The V_DC output terminal is connected to the input terminal of the DC-DC conversion circuit. The output terminal of the DC-DC conversion circuit is divided into two paths, one path passes through the first switch element and serves as the VDD output terminal, and the other path passes through the second switch element and serves as the VCC output terminal. The output terminal of the battery is connected to the VCC output terminal after passing through the third switch element.

[0009] The VCC output end is connected to the MCU and the power-consuming module that cannot be powered off respectively.

[0010] Optionally, the first switch element, the second switch element and the third switch element are double diodes.

[0011] Optionally, it further comprises a mains input terminal, a transformer and a rectifier circuit connected in sequence; the output terminal of the rectifier circuit comprises 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; and the AVDD output terminal is connected to an external analog circuit.

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

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

[0015] The second technical solution provided by the present invention is:

[0016] An electric energy meter, comprising the power module for efficient battery power consumption management as described above; and also comprising 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 further 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 the transistor Q3 is connected to the VCC output terminal of the power module, the base thereof is connected to the EE_Ctrl pin of the MCU, and the collector thereof is connected to the memory chip;

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

[0021] The third technical solution provided by the present invention is:

[0022] A power supply control method for an electric energy meter includes the above-mentioned electric energy meter; the power supply control method for the electric energy meter includes:

[0023] When the mains is normally supplied, the voltage output by the output terminal of the DC-DC conversion circuit is greater than the voltage output by the output terminal of the battery, so that the first switch element and the second switch element are turned on, and the voltages output by the VDD output terminal and the VCC output terminal of the power module are both provided by the mains;

[0024] When the mains power fails to supply power, the first switch element and the second switch element are turned off, the third switch element is turned on, and the voltage output by the VCC output terminal in the power module is provided by the battery.

[0025] Optionally, the power control method further includes:

[0026] 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 in the cut-off state, thereby cutting off the power supply of the memory chip and the FLASH chip;

[0027] When there is a need to read or write the memory or FLASH module, the MCU controls its EE_Ctrl pin and its FS_Ctrl pin so that the transistor Q3 of the memory and the transistor Q1 of the FLASH module are both in the on state, thereby restoring the power supply of the memory chip and the FLASH chip.

[0028] Optionally, the power control method further includes:

[0029] When the mains power fails, the MCU controls to turn off the display module, reduce the timing rate of the clock module, extend the RTC wake-up time, and enter deep sleep mode;

[0030] In the deep sleep mode, when the MCU detects a key wake-up operation, it controls the display module to turn on and modifies the RTC wake-up time to seconds; if the AC power cannot be supplied and the display module is turned on for a preset time, the display module is turned off, the RTC wake-up time is extended, and the deep sleep mode is entered again.

[0031] The beneficial effects of the present invention are as follows: when the mains power supply is normal, the voltage at the output of the DC-DC conversion circuit is greater than the voltage output by the battery, which will cause the first switch element and the second switch element to be turned on, and the voltage output by the power module is all provided by the mains power; when the mains power supply is unable to supply power, the first switch element and the second switch element are turned off, and the third switch element is turned on, and the battery only supplies power to the MCU connected to the VCC output terminal and the power-consuming module that cannot be powered off. The present invention can achieve efficient management of battery power consumption by only using a combination of three switch elements, minimize battery power consumption, and increase battery service life; compared to the supercapacitor solution, the present invention can not only greatly reduce 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a power module for efficient battery power consumption management provided in the first embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a power supply module in an electric energy meter provided in the second and third embodiments of the present invention;

[0034] Figure 3 A schematic diagram of the structure of the EEPROM memory in the electric energy meter provided in the third embodiment of the present invention;

[0035] Figure 4 This is a structural diagram of the FLASH module in the electric energy meter provided in the third embodiment of the present invention;

[0036] Figure 5 Schematic diagram of the power consumption management process of the electric energy meter in the power-off mode in the fourth embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the power consumption management process when the electric energy meter detects a key press to wake up in sleep mode in the fourth embodiment of the present invention.

[0038] Description of labels:

[0039] 1. Mains power input terminal; 2. Transformer; 3. Rectifier circuit; 4. DC-DC conversion circuit; 5. Battery;

[0040] 6. First switch element; 7. Second switch element; 8. Third switch element. DETAILED DESCRIPTION

[0041] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0042] Example 1

[0043] Please refer to Figure 1 , this embodiment provides a power module with efficient management of battery power consumption.

[0044] like Figure 1 As shown, the power supply module for efficient battery power consumption management provided in this embodiment includes: a mains input terminal 1, a transformer 2, a rectifier circuit 3, a V_DC output terminal, a DC-DC conversion circuit 4, a first switch element 6, a second switch element 7, a third switch element 8 and a battery 5.

[0045] Specifically, the mains input terminal 1, the transformer 2 and the 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 conversion circuit 4; the output terminal of the DC-DC conversion circuit 4 is divided into two paths, one path passes through the first switch element 6 and serves as the VDD output terminal, and the other path passes through the second switch element 7 and serves as the VCC output terminal; the output terminal of the battery 5 is connected to the VCC output terminal after passing through the third switch element 8.

[0046] The voltage outputted by the output terminal of the DC-DC conversion circuit is greater than the voltage outputted by the output terminal of the battery. The VCC output terminal is respectively connected to the MCU and the non-disabled power module.

[0047] In some specific implementations of this embodiment, the first switch element, the second switch element, and the third switch element are dual diodes D3, D11, and D12, respectively. Using dual diodes to control the on / off of the three power outputs of the circuit module has the advantages of high response speed, high reliability, simple structure, and low power consumption. This makes it more suitable for power-off scenarios and helps further reduce power consumption.

[0048] Of course, the first switch element, the second switch element and the third switch element can also be other components with circuit on-off control functions, such as diodes, transistors, MOSFET tubes and other switching tubes, which can be flexibly configured according to the needs of different application scenarios.

[0049] The working principle of this embodiment is:

[0050] After the AC 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 conversion circuit through the V_DC output end; the DC power supply V_DC is converted into the required voltage value by the DC-DC conversion circuit and is output stably in two ways; one of the outputs of the DC-DC conversion circuit passes through the first switch element as the VDD output end, which is used to power some non-non-power-off modules of the device when the AC power is normally supplied; the other output passes through the second switch element as the VCC output end, which is used to power the MCU of the device and some non-power-off power-consuming modules when the AC power is normally supplied; the output end of the battery BT1 is also connected to the VCC output end through the third switch element, which is used as the power output of the VCC output end when the AC power cannot supply power, to power the MCU and some non-power-off modules of the device.

[0051] When the mains is normally supplied, the voltage output by the output terminal of the DC-DC converter circuit is greater than the voltage output by the output terminal of the battery, which causes the first switch element and the second switch element to be turned on and the third switch element to be turned off. The voltages output by the VDD output terminal and the VCC output terminal are both provided by the output terminal of the DC-DC converter circuit, that is, the mains;

[0052] When the mains power fails to supply power, the first switch element and the second switch element are turned off at the same time, the third switch element is turned on, the VDD output terminal has no voltage output, and the voltage output by the VCC output terminal is provided by the battery.

[0053] As can be seen from the above, the power module provided in this embodiment divides the mains power output into two paths, one of which is the VDD output terminal, which is specifically used to supply power to power-consuming modules that are not non-interruptible; the other is the VCC output terminal, which is specifically used to supply power to the MCU and power-consuming modules that are non-interruptible; at the same time, the battery output will be connected to the VCC output terminal as a backup power output for the VCC output terminal; the above three power outputs of the power module are output controlled by a switch component respectively. In normal operation when the mains power is supplied, since the mains output voltage is greater than the battery output voltage, the two switch components connected to the mains output will be turned on, and the corresponding VDD output terminal and VCC output terminal will be provided by the mains; in the special case where the mains power cannot be supplied, the switch component connected to the power output will be turned on, and the battery output voltage will be transmitted to the VCC output terminal, which will only supply power to power-consuming modules that are non-interruptible, ensuring that the equipment maintains basic functions.

[0054] It can be seen that the power module provided in this embodiment can achieve efficient management of battery power consumption by reasonably distributing the power output and combining the control of the three switch components, thereby minimizing battery power consumption and increasing 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, thereby extending battery life while ensuring equipment safety and operational stability.

[0055] Example 2

[0056] See also Figure 2 This embodiment is further expanded based on the embodiment and applied to the field of electric energy meters to provide a power module for an electric energy meter, which can achieve efficient management of battery power consumption in the electric energy meter.

[0057] like Figure 2 As shown, the power supply module of the electric energy meter provided in this embodiment is based on the embodiment 1, and the output ends of the rectifier circuit respectively include the V_DC output end (i.e. Figure 2 V_DC in), communication voltage output terminal (i.e. Figure 2 V_485 in) and AVDD output (i.e. Figure 2 AVDD in the .

[0058] 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 modules (MCU and peripheral circuits) of the energy meter when the mains is powered on (normal power supply).

[0059] In some specific embodiments, the above-mentioned main power-consuming modules include but are not limited to MCU, buttons, infrared, LCD, memory, security module, LED and relay driver, etc.

[0060] The communication voltage output terminal is connected to an external communication module and is used to supply power to the communication module in the electric energy meter when the mains is powered on, thereby ensuring the normal operation of the communication module in the electric energy meter.

[0061] In some embodiments, such as Figure 2 As shown, the communication voltage output terminal is specifically a V485 output terminal; and the communication module is an RS485 circuit.

[0062] The AVDD output terminal is connected to an external analog circuit and is used to power the analog circuit in the energy meter when the mains is turned on. Here, the analog circuit in the energy meter includes a metering circuit, an oscillation circuit, etc.

[0063] In some specific implementations of this embodiment, 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 the mains is on, the DC power converted from the mains is 5.4V, which is higher than the 3.6V voltage supplied by the battery. Therefore, the VDD and VCC outputs are both powered by 5.4V. When the energy meter loses power, the DC power converted from the mains is lower than the battery power, and the VCC output is powered entirely by the battery.

[0064] In some specific implementations of this embodiment, the non-non-disabled power-consuming modules connected to the VDD output terminal include infrared modules, LED modules, security modules (such as ESAM modules), relays, etc. Because these power-consuming modules may not use their functions in the event of a power outage, in order to reduce battery power consumption, they can be de-powered after a power outage. Therefore, the power supply module of the electric energy meter in this embodiment divides a separate line (i.e., the VDD output terminal) from the mains output for independent power supply, distinguishing it from the battery output line that requires a backup power supply; thus, when the electric energy meter loses power, this output line (i.e., the VDD output terminal) will not be powered by the battery output, thereby reducing battery power consumption without affecting the basic functions of the electric energy meter.

[0065] In some specific embodiments, the non-power-off power-consuming module connected to the VCC output terminal may include an MCU, a button module, a liquid crystal module, a memory, etc. The non-power-off power-consuming module refers to a power-consuming module that needs to be powered by a battery after the power meter loses power to ensure that its functions can be used normally. Here, the power-consuming module connected to the VCC output terminal can be flexibly selected according to the different requirements of the power meter in different usage scenarios. For example, in some specific application scenarios, it is required to ensure the normal use of the button function after the power meter loses power, then the corresponding button module belongs to the non-power-off power-consuming module, and it needs to be configured to be connected to the VCC output terminal; on the contrary, in other specific application scenarios, there is no such requirement, then the corresponding relay drive, security module and infrared module belong to the non-non-power-off power-consuming module that can be powered off after power failure, and it can be configured to be connected to the VDD output terminal in this embodiment.

[0066] The power supply module of the electric energy meter provided in this embodiment is as follows: Figure 2 As shown in the figure, after the AC mains is added to the energy meter, the mains will be transformed by the transformer and rectified by the rectifier bridge into three power outputs: V_DC, V485 and AVDD. Among them, the V_DC output will pass through the DC-DC conversion circuit to obtain the required stable voltage output and then be divided into two paths. One path passes through the first switch ( Figure 2 D3 shown in the figure) is used as the VDD output terminal to supply power to some power-off power modules; the other path is through the second switch ( Figure 2D1 shown in the figure) serves as the VCC output terminal to power the MCU and the power-consuming modules that cannot be powered off; in particular, the battery ( Figure 2 The BT1) output will pass through the third switch ( Figure 2 D12 is also connected to the VCC output terminal. 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, turning on the first and second switches, and all power-consuming modules are powered by the mains power. When the mains power fails, the first and second switches are turned off, and the third switch is turned on. The battery then powers only the MCU connected to the VCC output terminal and the power-consuming modules that cannot be powered off.

[0067] The power module of the electric energy meter provided in this embodiment can achieve efficient management of the power consumption of the electric energy meter battery by reasonably distributing the power output and combining the control of the three switch components, thereby minimizing the power consumption of the battery in the electric energy meter and increasing the service life of the electric energy meter battery. Compared with the supercapacitor solution of traditional electric energy meters, this embodiment can not only greatly reduce the cost of the electric energy meter, but more importantly, it can also effectively solve the battery undervoltage problem during the use of the electric energy meter, thereby extending the battery life of the electric energy meter while ensuring the safety of the electric energy meter and the stability of the metering operation.

[0068] Example 3

[0069] Please refer to Figures 2 to 4 This embodiment further expands upon the second embodiment and provides an electric energy meter.

[0070] This embodiment provides an electric energy meter, including: Figure 2 The power module for efficient battery power consumption management as described in the second embodiment shown above also includes Figure 2 The MCU, metering module, communication module, non-non-non-interruptible module and non-non-non-interruptible module are not shown.

[0071] The internal structure and connection relationship of the power module, as well as the connection relationship between the power module and the above modules will not be repeated here. For details, please refer to the description of the above embodiment 2.

[0072] In some specific implementations of this embodiment, 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 The MCU is used to monitor the battery voltage in real time and take protective measures in time when a battery undervoltage problem is detected, thereby effectively avoiding the impact of the battery undervoltage problem on the energy meter.

[0073] In some specific implementations of this embodiment, the electric energy meter further includes a memory EEPROM. Figure 3 As shown, the memory EEPROM includes a transistor Q3 and a memory chip U5; the emitter of the transistor Q3 is connected to the VCC output terminal in the power module, the base thereof is connected to the EE_Ctrl pin of the MCU, and the collector thereof is connected to the memory chip U5.

[0074] The working principle of the memory EEPROM is:

[0075] During the operation of the MCU, when a high level is output through its EE_Ctrl pin, the transistor Q3 is in the cut-off state, and the VCC output end will not be able to power the memory chip U5 through the transistor Q3; when the MCU determines that there is a need to perform data reading and writing operations on the memory EEPROM, it will output a low level through its EE_Ctrl pin to turn on the transistor Q3, and the VCC output end will provide power to the memory chip U5 through the transistor Q3, so that the memory chip U5 can work normally and complete the data reading and writing operations.

[0076] In some specific implementations of this embodiment, the electric energy meter further includes a FLASH module. 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 in the power module, the base thereof is connected to the FS_Ctrl pin of the MCU, and the collector thereof is connected to the FLASH chip U13 through the voltage regulator chip U14.

[0077] The working principle of the FLASH module is:

[0078] During the operation of the MCU, when a high level is output through its FS_Ctrl pin, the transistor Q1 is in the cut-off state. The power output of the VCC output end will not be able to reach the voltage regulator chip U14 through the transistor Q1, and thus cannot provide stable power for the FLASH chip U13, and the FLASH chip U13 cannot work; when the MCU determines that there is a need to perform data read and write operations on the FLASH module, it will output a low level through its FS_Ctrl pin to turn on the transistor Q1, and then the VCC output end can reach the voltage regulator chip U14 through the transistor Q1, and thus provide stable power for the FLASH chip U13, so that the FLASH chip U13 can work normally and complete the data read and write operations.

[0079] As can be seen from the above, the electric energy meter provided in this embodiment is respectively provided with a transistor in the memory and the FLASH module. The power supply of the memory and FLASH modules is turned off and outputted through the control of the transistor by the MCU, so that the memory and FLASH modules are powered on only when necessary to ensure normal storage operation. When the read and write operations are not required, the storage power supply is controlled to turn off its power supply, thereby effectively reducing the static power consumption of the electric energy meter. In addition, it can be understood that since the VCC output end is completely powered by the battery when the electric energy meter loses power, the above power management for the memory and FLASH modules can also effectively reduce the battery power consumption.

[0080] The energy meter provided by this embodiment can achieve efficient battery power management, minimize battery power consumption, and extend battery life. Compared with traditional supercapacitor solutions for energy meters, this embodiment not only significantly reduces the cost of the energy meter but, more importantly, effectively resolves the battery undervoltage issue during meter use, extending the battery life while ensuring meter safety and metering stability. Furthermore, by optimizing the power control of its memory and FLASH modules, it can further reduce the static power consumption of the battery.

[0081] Example 4

[0082] This embodiment further expands upon the third embodiment above and provides a power control method for an electric energy meter. The power control method of this embodiment is implemented based on the electric energy meter described in the third embodiment above. The structure and connection relationship of the electric energy meter will not be repeated here. For details, please refer to the description of the third embodiment above.

[0083] The power supply control method of the electric energy meter provided in this embodiment:

[0084] When the mains is normally supplied, the voltage output by the output terminal of the DC-DC converter circuit is greater than the voltage output by the output terminal of the battery, which causes the first switch element and the second switch element to be turned on, and the voltages output by the VDD output terminal and the VCC output terminal of the power module are both provided by the mains;

[0085] When the mains power fails to supply power, the first switch element and the second switch element are turned off, the third switch element is turned on, and the voltage output by the VCC output terminal in the power module is provided by the battery.

[0086] 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 in the cut-off state, thereby cutting off the power supply of the memory chip and the FLASH chip;

[0087] When there is a need to read or write the memory or FLASH module, the MCU controls its EE_Ctrl pin and its FS_Ctrl pin so that the transistor Q3 of the memory and the transistor Q1 of the FLASH module are both in the on state, thereby restoring the power supply of the memory chip and the FLASH chip.

[0088] In some specific embodiments, the MCU performs the aforementioned memory and FLASH module power control only when the mains power is unavailable. That is, when powered by a battery, the memory and FLASH modules are powered by the battery only when read and write operations are required, thereby effectively reducing the battery power consumption of the energy meter.

[0089] The power supply control method of the electric energy meter of this embodiment utilizes the combined control of three switching elements to achieve efficient management of battery power consumption, minimize battery power consumption, and increase battery service life. Compared with the supercapacitor solution, it can not only greatly reduce the cost of the electric energy meter, but also effectively reduce the probability of battery undervoltage problems, thereby extending battery life while ensuring equipment safety and operational stability.

[0090] In some further specific implementations of this embodiment, the power supply control method of the electric energy meter will further optimize the display function of the electric energy meter.

[0091] The power supply control method of the electric energy meter further includes:

[0092] When the mains power fails, the MCU controls to turn off the power of the LCD and the internal display module. The LCD will only turn on after detecting external power-on (i.e. when the mains power is restored) or a key wake-up is pressed.

[0093] Preferably, if a key press is detected during power-off mode but no key press is performed continuously, the MCU will control the LCD to rotate through items and then turn off the LCD. If no key press is detected within a preset period of time (e.g., 60 seconds) after the key press is activated, the MCU will control the LCD to turn off. This minimizes battery power consumption caused by the display function after power failure.

[0094] See below. Figure 5 and Figure 6 This embodiment will explain in detail the power supply control method of the electric energy meter through two preferred specific implementation methods:

[0095] like Figure 5 As shown in the figure, the power consumption management process of the energy meter in power-down mode includes:

[0096] When the energy meter detects a power failure, it immediately enters the power-off cycle program, first switching to a low-speed clock, that is, reducing the clock rate; at the same time, the display module, peripheral circuit power supply, metering module power supply, infrared power supply, EEPROM and FLASH power supply are turned off, that is, all the power-consuming modules connected to the VDD output of the power module are turned off; at the same time, the power-consuming modules connected to the VCC output of the power module are powered by the battery; in addition, the RTC wake-up time will be extended, such as configuring the RTC wake-up function to "hourly wake-up"; then the energy meter enters sleep mode.

[0097] When the energy meter enters a deep sleep state, the power consumption is reduced to 3uA. When the energy meter is awakened, the interrupt source will be judged. If it is awakened by a power interruption, the process of judging whether the energy meter is powered on will be entered; if it is awakened by an RTC interruption, the RTC will be temperature compensated according to the current detected temperature at a preset time interval to ensure the accuracy of the clock module, and then the process of judging whether the energy meter is powered on will be entered; if it is awakened by a key interruption, the display module will be turned on. If it is awakened by a cover opening key interruption, the cover opening event will be recorded, and then the process of judging whether the energy meter is powered on will be entered. Among them, the process of judging whether the energy meter is powered on includes: judging whether the energy meter is powered on, if so, jumping to the power-on mode, if not, continuing to enter the sleep mode.

[0098] like Figure 6 As shown in the figure, the power management process of the energy meter detecting a key wake-up in sleep mode includes:

[0099] When the energy meter detects a key 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 to ensure accurate calculation of the remaining display time of the LCD; then it will cyclically detect 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 the sleep mode.

[0100] The power control method of the electric energy meter provided by the above two preferred specific embodiments can achieve efficient management of battery power consumption in the electric energy meter by optimizing the power management after the electric energy meter loses power, thereby minimizing the battery power consumption and increasing the service life of the battery in the electric energy meter.

[0101] It is understood that the power supply control methods for electric energy meters provided in the two preferred embodiments described above can be implemented by the electric energy meter's MCU executing a corresponding computer program and instructing the relevant hardware. The program can be stored in a computer-readable storage medium. When executed by the electric energy meter's MCU, the program can include the processes of the above-mentioned methods. After being executed by the electric energy meter's MCU, the program can also achieve the beneficial effects of the corresponding methods.

[0102] In summary, the power module, electric energy meter, and power management method for efficiently managing battery power consumption provided by the present invention have the following advantages:

[0103] 1. Improve the efficiency of battery usage in electric energy meters while saving R&D costs;

[0104] 2. Reduce the static power consumption of the battery in the energy meter;

[0105] 3. Improve the service life of batteries in electric energy meters;

[0106] 4. Effectively reduce the probability of battery undervoltage during the use of the energy meter.

[0107] 5. Effectively solve the problem of battery undervoltage affecting the accuracy of the meter clock.

[0108] It can be seen that the power module, electric energy meter and power management method for efficient battery power consumption management provided by the present invention are lower in cost, more reliable and stable than traditional battery-powered power consumption management methods, and can greatly extend the service life of batteries and electric energy meters.

[0109] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power module with efficient battery power consumption management, characterized in that: include: A V_DC output terminal, a DC-DC conversion circuit, a first switch element, a second switch element, a third switch element, and a battery; The V_DC output terminal is connected to the input terminal of the DC-DC conversion circuit. The output terminal of the DC-DC conversion circuit is divided into two paths, one path passes through the first switch element and serves as the VDD output terminal, and the other path passes through the second switch element and serves as the VCC output terminal. The output terminal of the battery is connected to the VCC output terminal after passing through the third switch element. The VCC output end is connected to the MCU and the power-consuming module that cannot be powered off respectively.

2. The power module for efficient battery power consumption management according to claim 1, wherein: The first switch element, the second switch element and the third switch element are double diodes.

3. The power module for efficient battery power consumption management according to claim 1, wherein: 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; and the AVDD output terminal is connected to an external analog circuit.

4. The power module for efficient battery power consumption management according to claim 3, wherein: The communication voltage output terminal is a V485 output terminal; the communication module is an RS485 circuit.

5. The power module with efficient battery power consumption management according to claim 3, characterized in that: The analog circuit is a metering circuit.

6. Electric energy meter, characterized in that, A power supply module for efficient battery power consumption management comprising any one of claims 1 to 5; and 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 electric energy meter according to 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 the transistor Q3 is connected to the VCC output terminal of the power module, the base thereof is connected to the EE_Ctrl pin of the MCU, and the collector thereof is connected to the memory chip; The emitter of the transistor Q1 is connected to the VCC output terminal of the power module, the base thereof is connected to the FS_Ctrl pin of the MCU, and the collector thereof is connected to the FLASH chip through the voltage stabilizing chip.

8. A power supply control method for an electric energy meter, characterized in that: The electric energy meter according to claim 6 or 7 above; the power supply control method of the electric energy meter comprises: When the mains is normally supplied, the voltage output by the output terminal of the DC-DC conversion circuit is greater than the voltage output by the output terminal of the battery, so that the first switch element and the second switch element are turned on, and the voltages output by the VDD output terminal and the VCC output terminal of the power module are both provided by the mains; When the mains power fails to supply power, the first switch element and the second switch element are turned off, the third switch element is turned on, and the voltage output by the VCC output terminal in the power module is provided by the battery.

9. The power supply control method of the electric energy meter according to claim 8, characterized in that: The power control method further includes: 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 in the cut-off state, thereby cutting off the power supply of the memory chip and the FLASH chip; When there is a need to read or write the memory or FLASH module, the MCU controls its EE_Ctrl pin and its FS_Ctrl pin so that the transistor Q3 of the memory and the transistor Q1 of the FLASH module are both in the on state, thereby restoring the power supply of the memory chip and the FLASH chip.

10. The power supply control method of the electric energy meter according to claim 8, characterized in that: The power control method further includes: When the mains power fails, the MCU controls to turn off the display module, reduce the timing rate of the clock module, extend the RTC wake-up time, and enter deep sleep mode; In the deep sleep mode, when the MCU detects a key wake-up operation, it controls the display module to turn on and modifies the RTC wake-up time to seconds; if the AC power cannot be supplied and the display module is turned on for a preset time, the display module is turned off, the RTC wake-up time is extended, and the deep sleep mode is entered again.

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