Electromagnetic water meter power supply circuit and electromagnetic water meter system comprising same

Abstract

The utility model relates to the field of electromagnetic water meters, and provides an electromagnetic water meter power supply circuit and an electromagnetic water meter system comprising the same. The standby battery power supply circuit comprises a main battery, a standby battery, a low-dropout linear regulator, an electromagnetic water meter control chip, a first low-dropout diode, a second low-dropout diode, a first voltage monitoring sub-circuit and a second voltage monitoring sub-circuit. The standby battery main battery, the standby battery first low dropout diode and the standby battery electromagnetic water meter control chip are sequentially connected, and the standby battery main battery is used for being connected with the standby battery electromagnetic water meter measuring circuit and the standby battery data remote transmission circuit; and the standby battery, the standby battery low dropout linear regulator, the standby battery second low dropout diode and the standby battery electromagnetic water meter control chip are connected in sequence. According to the application, the function of automatically switching to the standby battery for power supply when the main battery is lack of power, real-time monitoring of the battery voltage and remote transmission of alarm information are realized.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic water meters, and in particular to an electromagnetic water meter power supply circuit and an electromagnetic water meter system including the same. Background Art

[0002] In the existing field of electromagnetic water meter technology, traditional power supply designs generally rely on a single main battery as the core power source, providing continuous power support for the main water meter's measurement circuitry and data transmission circuitry. As the electromagnetic water meter ages, the main battery's power gradually depletes. When its power level falls below a certain threshold, it enters a low-power state and is no longer able to meet the power requirements for normal operation of the electromagnetic water meter.

[0003] When the main battery runs low, existing electromagnetic water meters often fail to measure properly due to insufficient power supply to the measuring circuit due to the lack of an effective backup power supply switching mechanism. This can easily lead to disputes when electromagnetic water meters are used for trade settlement. Utility Model Content

[0004] In order to help solve the problem of the lack of an effective backup power supply switching mechanism in the existing electromagnetic water meter power supply circuit, the present application provides an electromagnetic water meter power supply circuit and an electromagnetic water meter system including the same.

[0005] In a first aspect, the present application provides an electromagnetic water meter power supply circuit, which adopts the following technical solution:

[0006] An electromagnetic water meter power supply circuit, wherein the power supply circuit is used to power the electromagnetic water meter measurement circuit and the data remote transmission circuit, and the power supply circuit includes a main battery, a backup battery, a low-voltage dropout linear regulator, an electromagnetic water meter control chip, a first low-voltage dropout diode, a second low-voltage dropout diode, a first voltage monitoring subcircuit and a second voltage monitoring subcircuit.

[0007] The main battery, the first low voltage dropout diode and the electromagnetic water meter control chip are connected in sequence. The main battery is used to connect the electromagnetic water meter measurement circuit and the data remote transmission circuit, and is used to provide the main battery output voltage to the electromagnetic water meter measurement circuit, the data remote transmission circuit and the electromagnetic water meter control chip.

[0008] The backup battery, the low-voltage dropout linear regulator, the second low-voltage dropout diode and the electromagnetic water meter control chip are connected in sequence, the backup battery is used to output a backup battery output voltage, the low-voltage dropout linear regulator is used to output a stable voltage to the electromagnetic water meter control chip according to the backup battery output voltage, and the stable voltage value of the stable voltage is less than the main battery output voltage value of the main battery output voltage.

[0009] The main battery, the first voltage monitoring subcircuit and the electromagnetic water meter control chip are connected in sequence, and the first voltage monitoring subcircuit is used to monitor and transmit the main battery output voltage value of the main battery output voltage.

[0010] The backup battery, the second voltage monitoring subcircuit and the electromagnetic water meter control chip are connected in sequence, the second voltage monitoring subcircuit is used to monitor and transmit the backup battery output voltage value of the backup battery output voltage, and the electromagnetic water meter control chip is used to receive the main battery output voltage value and the backup battery output voltage value.

[0011] By adopting the above technical solution, the basic structure of an electromagnetic water meter power supply circuit is described, including a main battery, a backup battery, a low-dropout linear regulator, an electromagnetic water meter control chip, and a low-voltage dropout diode. The main battery powers the control chip and measurement circuit via a low-voltage dropout diode, while the backup battery is stepped down by an LDOV3 to power the control chip. A voltage monitoring subcircuit is also designed to monitor the battery voltage. This design ensures stable operation of the electromagnetic water meter when the main battery power is normal and seamlessly switches to the backup battery power supply when the main battery power is low, ensuring continuous and accurate measurement. The voltage monitoring subcircuit monitors the battery voltage in real time, providing data support for subsequent battery management.

[0012] Preferably, the power supply circuit further includes a third low voltage difference diode, a fourth low voltage difference diode and an electronic switch sub-circuit.

[0013] The electronic switch subcircuit has a first end, a second end, and a third end. The first end, the anode of the fourth low voltage difference diode, the cathode of the fourth low voltage difference diode, the cathode of the third low voltage difference diode, the anode of the third low voltage difference diode, and the main battery are connected in sequence. The second end is connected to the backup battery. The third end is connected to the electromagnetic water meter control chip.

[0014] The electromagnetic water meter control chip is provided with a first main battery output voltage value threshold, and the electromagnetic water meter control chip is used to control the opening and closing of the electronic switch subcircuit according to the main battery output voltage value.

[0015] By adopting the above technical solution, a third low-voltage dropout diode, a fourth low-voltage dropout diode, and an electronic switch subcircuit are added. These components work in conjunction with the control chip to control the on and off of the electronic switch based on the battery voltage, thereby controlling whether the backup battery powers the measurement circuit, further enhancing the circuit's flexibility and reliability. Through the control chip's intelligent control, the timing of the backup battery's power supply can be precisely controlled, avoiding unnecessary power consumption and ensuring rapid switching to the backup battery when the main battery is low.

[0016] Preferably, the electromagnetic water meter control chip is also provided with a second main battery output voltage value threshold and a backup battery output voltage value threshold. The electromagnetic water meter control chip is used to connect to the data remote transmission circuit, and to send alarm information to the data remote transmission circuit according to the main battery output voltage value and the backup battery output voltage value.

[0017] By adopting the above technical solution, a voltage threshold is set for the control chip, and it can be connected to the data remote transmission circuit to send alarm information, so that the electromagnetic water meter can monitor the battery status in real time and send an alarm information to the system platform in time when the battery voltage is lower than the set threshold, reminding the user to replace the battery, thereby avoiding measurement interruption caused by battery depletion.

[0018] Preferably, the electromagnetic water meter control chip is provided with a frequency parameter, and the electromagnetic water meter control chip is used to periodically control the opening and closing of the electronic switch circuit according to the frequency parameter.

[0019] By adopting this technical solution, a frequency parameter is set for the control chip to periodically control the opening and closing of the electronic switch circuit. This design can regularly activate the backup battery, preventing it from being degraded due to long periods of disuse, and also helps to extend the service life of the backup battery.

[0020] Preferably, the first voltage monitoring subcircuit includes a first MOS transistor, a first resistor, a second resistor, and a third resistor. The source of the first MOS transistor is used to connect to the main battery, the gate of the first MOS transistor is used to connect to the electromagnetic water meter control chip, the drain of the first MOS transistor is connected to the second resistor, one end of the first resistor is used to connect to the main battery, and the other end is connected to the gate of the first MOS transistor, one end of the second resistor is connected to the drain of the first MOS transistor, and the other end is used to connect to the electromagnetic water meter control chip, one end of the third resistor is connected to the second resistor, and the other end is grounded.

[0021] The first resistor is used to limit the current passing through the first MOS transistor, and the second resistor and the third resistor are used to divide the voltage for the first voltage detection sub-circuit.

[0022] By adopting the above technical solution, the specific implementation of the first voltage monitoring subcircuit is described, including the connection method of components such as MOS transistors and resistors. These subcircuits can accurately monitor the voltages of the main battery and backup battery and transmit the monitoring results to the control chip.

[0023] Preferably, the second voltage monitoring subcircuit includes a second MOS transistor, a fourth resistor, a fifth resistor and a sixth resistor, the source of the second MOS transistor is used to connect to the backup battery, the gate of the second MOS transistor is used to connect to the electromagnetic water meter control chip, the drain of the second MOS transistor is connected to the fifth resistor, one end of the fourth resistor is used to connect to the backup battery, and the other end is connected to the gate of the second MOS transistor, one end of the fifth resistor is connected to the drain of the second MOS transistor, and the other end is used to connect to the electromagnetic water meter control chip, one end of the sixth resistor is connected to the fifth resistor, and the other end is grounded.

[0024] The fourth resistor is used to limit the current passing through the second MOS transistor, and the fifth resistor and the sixth resistor are used to divide the voltage for the second voltage detection sub-circuit.

[0025] By adopting the above technical solution, the specific implementation of the second voltage monitoring subcircuit is described. The design of the voltage monitoring subcircuit provides accurate battery voltage data support for the control chip. By monitoring the voltage status of the main battery and backup battery in real time, the control chip can accurately determine the remaining battery charge and power supply capacity, thereby making reasonable power supply decisions.

[0026] Preferably, the electronic switch circuit includes a third MOS tube and a seventh resistor, the source of the third MOS tube is used to connect to the backup battery, the gate of the third MOS tube is used to connect to the electromagnetic water meter control chip, the drain of the third MOS tube is used to connect to the positive electrode of the fourth low voltage difference diode, one end of the seventh resistor is used to connect to the backup battery, and the other end is used to connect to the gate of the third MOS tube, and the seventh resistor is used to limit the current passing through the third MOS tube.

[0027] By adopting the above technical solution, the specific implementation of the electronic switch circuit is described, including the connection method of the third MOS transistor and the resistor. This design enables the electronic switch circuit to reliably control the backup battery's power supply to the measurement circuit, ensuring that the power source can be quickly switched when the main battery is depleted.

[0028] In a second aspect, the present application provides an electromagnetic water meter system, which adopts the following technical solution:

[0029] An electromagnetic water meter system, wherein the electromagnetic water meter system includes the power supply circuit as described in any one of the first aspects above, and the electromagnetic water meter system also includes the electromagnetic water meter measurement circuit, the data remote transmission circuit power supply and the electromagnetic water meter.

[0030] By adopting the above technical solution, an electromagnetic water meter system including the above power supply circuit is provided. This system integrates all necessary components and functions, can operate stably and reliably, and automatically switches to the backup battery power supply when the main battery is low, ensuring continuous and accurate measurement.

[0031] In summary, this application has designed a backup battery power supply circuit for an electromagnetic water meter, achieving a function that automatically switches to a backup battery when the main battery is depleted, thus ensuring the continuity and accuracy of electromagnetic water meter measurements. Furthermore, through the intelligent control of the control chip, real-time monitoring of the battery voltage and remote transmission of alarm information are achieved, improving system reliability and maintenance efficiency. Furthermore, by periodically activating the backup battery and precisely controlling the opening and closing of the electronic switching circuit, the service life of the backup battery is further extended, reducing the operating costs of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic block diagram of an embodiment of an electromagnetic water meter power supply circuit of the present application;

[0033] Figure 2 This is a structural diagram of an embodiment of the first voltage monitoring sub-circuit of the present application;

[0034] Figure 3 A schematic structural diagram of an embodiment of a second voltage monitoring sub-circuit of the present application; and

[0035] Figure 4 This is a schematic structural diagram of an embodiment of the electronic switch circuit of the present application.

[0036] Figure numerals: 1. Second voltage monitoring subcircuit; 2. Electronic switch subcircuit; 3. First voltage monitoring subcircuit; 4. Data remote transmission circuit; 5. Electromagnetic water meter measurement circuit. DETAILED DESCRIPTION

[0037] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of an electromagnetic water meter power supply circuit and an electromagnetic water meter system including the same according to the present application will be described below in an exemplary manner. However, all descriptions should not be used to form any limitations on the present application.

[0038] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to this application are also within the scope of the description in this document.

[0039] It should also be noted that terms such as "disposed" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediary. Unless otherwise specified, those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Figure 1 This is a schematic block diagram of an embodiment of an electromagnetic water meter power supply circuit of the present application. The power supply circuit is used to power the electromagnetic water meter measurement circuit 5 and the data remote transmission circuit 4. In this embodiment, the power supply circuit includes a main battery V1, a backup battery V2, a low voltage dropout linear regulator LDO V3, an electromagnetic water meter control chip MCU, a first low voltage dropout diode D1, a second low voltage dropout diode D2, a first voltage monitoring subcircuit 3 and a second voltage monitoring subcircuit 1. The main battery V1, the first low voltage dropout diode D1 and the electromagnetic water meter control chip MCU are connected in sequence. The main battery V1 is used to connect the electromagnetic water meter measurement circuit 5 and the data remote transmission circuit 4, and is used to provide the main battery output voltage to the electromagnetic water meter measurement circuit 5, the data remote transmission circuit 4 and the electromagnetic water meter control chip MCU. The backup battery V2, the low voltage dropout linear regulator LDO V3, the second low voltage dropout diode D2 and the electromagnetic water meter control chip MCU are connected in sequence. The backup battery V2 is used to output the backup battery output voltage. The low voltage dropout linear regulator LDO V3 is used to output a stable voltage to the electromagnetic water meter control chip MCU according to the output voltage of the backup battery. The stable voltage value of the stable voltage is less than the main battery output voltage value of the main battery output voltage. The main battery, the first voltage monitoring sub-circuit 3 and the electromagnetic water meter control chip MCU are connected in sequence. The first voltage monitoring sub-circuit 3 is used to monitor and transmit the main battery output voltage value of the main battery output voltage. The backup battery V2, the second voltage monitoring sub-circuit 1 and the electromagnetic water meter control chip MCU are connected in sequence. The second voltage monitoring sub-circuit 1 is used to monitor and transmit the backup battery output voltage value of the backup battery output voltage. The electromagnetic water meter control chip MCU is used to receive the main battery output voltage value and the backup battery output voltage value.

[0041] In this embodiment, the main battery V1 supplies power to the electromagnetic water meter control chip MCU via the second low-voltage dropout diode D2, and supplies power to the electromagnetic water meter measurement circuit 5 via the first low-voltage dropout diode D1. Since the backup battery V2 is stepped down by the low-voltage dropout linear regulator LDO V3, the regulated voltage output by LDO V3 ​​is lower than the main battery output voltage of the main battery V1. Therefore, when the main battery V1 has normal power supply capacity, the first and second low-voltage dropout diodes D1 and D2 will preferentially conduct due to the unidirectional conductivity of the diodes. Due to the preferential conduction of the first and second low-voltage dropout diodes D1 and D2, the electromagnetic water meter measurement circuit 5 and the electromagnetic water meter control chip MCU are powered by the main battery V1, the third low-voltage dropout diode D3 is cut off, and the backup battery V2 only supplies power to the LDO V3, which consumes extremely low power and almost no power. Therefore, only when the main battery V1 is low and its output voltage falls below the regulated output voltage of LDOV3 does diode D3 conduct preferentially, allowing the backup battery V2 to power the electromagnetic water meter's control chip MCU. The main battery powers the control chip and measurement circuits via a low-voltage dropout diode, while the backup battery, after being stepped down by LDOV3, powers the control chip. A voltage monitoring subcircuit is also included to monitor the battery voltage. This design ensures stable operation of the electromagnetic water meter when the main battery is operating normally. It also seamlessly switches to the backup battery when the main battery is depleted, ensuring continuous and accurate measurement. The voltage monitoring subcircuit monitors the battery voltage in real time, providing data support for subsequent battery management.

[0042] from Figure 1 As can be seen, the power supply circuit also includes a fourth low-voltage dropout diode D4 and an electronic switch subcircuit 2. The electronic switch subcircuit 2 has a first end, a second end, and a third end. The first end, the anode of the fourth low-voltage dropout diode, the cathode of the fourth low-voltage dropout diode, the cathode of the third low-voltage dropout diode, the anode of the third low-voltage dropout diode, and the main battery V1 are connected in sequence. The second end is connected to the backup battery V2, and the third end is connected to the electromagnetic water meter control chip MCU. The electromagnetic water meter control chip MCU is provided with a first main battery output voltage threshold value. The electromagnetic water meter control chip MCU is used to control the opening and closing of the electronic switch subcircuit 2 based on the main battery output voltage value. In addition, the electromagnetic water meter control chip MCU is also provided with a second main battery output voltage threshold value and a backup battery output voltage threshold value. The electromagnetic water meter control chip MCU is used to connect to the data remote transmission circuit 4 and is used to send alarm information to the data remote transmission circuit 4 based on the main battery output voltage value and the backup battery output voltage value.

[0043] Specifically, the first voltage monitoring sub-circuit 3 monitors the main battery output voltage value of the main battery output voltage in real time and transmits it to the electromagnetic water meter control chip MCU. The second voltage monitoring sub-circuit 1 monitors the backup battery output voltage value of the backup battery output voltage in real time and transmits it to the electromagnetic water meter control chip MCU. The electromagnetic water meter control chip is used to receive the main battery output voltage value and the backup battery output voltage value.

[0044] When the main battery output voltage value output by main battery V1 is higher than the first main battery output voltage value threshold, the electromagnetic water meter control chip MCU will control the switch in the electronic switch subcircuit 2 to be in the off state, and the backup battery V2 will be unable to power the electromagnetic water meter measurement circuit 5. The electromagnetic water meter measurement circuit 5 is powered by the main battery V1. When the main battery output voltage value output by main battery V1 is lower than the first main battery output voltage value threshold, the electromagnetic water meter control chip MCU will control the switch in the electronic switch subcircuit 2 to be in the on state, and the backup battery V2 can power the electromagnetic water meter measurement circuit 5. However, the backup battery V2 only powers the electromagnetic water meter control chip MCU and the electromagnetic water meter measurement circuit 5, thereby conserving energy and ensuring the service life of the backup battery V2.

[0045] When the main battery output voltage value output by the main battery V1 falls below the second main battery output voltage value threshold, the electromagnetic water meter control chip MCU will send an alarm message to the remote data transmission circuit 4, reminding the user to replace the battery, thereby avoiding measurement interruptions caused by battery depletion. When the backup battery output voltage value output by the backup battery V2 falls below the backup battery output voltage value threshold, the electromagnetic water meter control chip MCU will send an alarm message to the remote data transmission circuit 4, reminding the user to replace the battery, thereby avoiding measurement interruptions caused by battery depletion.

[0046] In order to prevent the backup battery V2 from being passivated due to long-term non-use or extremely low discharge, the electromagnetic water meter control chip MCU is set with a frequency parameter. The electromagnetic water meter control chip MCU is used to periodically control the opening and closing of the electronic switch circuit according to the frequency parameter, thereby regularly activating the backup battery V2.

[0047] Figure 2This is a structural diagram of an embodiment of the first voltage monitoring subcircuit of the present application. In this embodiment, the first voltage monitoring subcircuit 3 may include a first MOS transistor Q1, a first resistor R1, a second resistor R2, and a third resistor R3. The source of the first MOS transistor Q1 is used to connect to the main battery V1, the gate of the first MOS transistor Q1 is used to connect to the electromagnetic water meter control chip MCU, the drain of the first MOS transistor Q1 is connected to the second resistor R2, one end of the first resistor R1 is used to connect to the main battery V1, and the other end is connected to the gate of the first MOS transistor Q1, one end of the second resistor R2 is connected to the drain of the first MOS transistor Q1, and the other end is used to connect to the electromagnetic water meter control chip MCU, one end of the third resistor R3 is connected to the second resistor R2, and the other end is grounded. The first resistor R1 is used to limit the current passing through the first MOS transistor, and the second resistor R2 and the third resistor R3 are used to divide the voltage for the first voltage detection subcircuit. A in the figure represents the control pin of the electromagnetic water meter control chip MCU, and B represents the ADC input interface of the electromagnetic water meter control chip MCU.

[0048] Specifically, the main battery V1 provides power to the first voltage monitoring sub-circuit 3, and the electromagnetic water meter control chip MCU controls the on / off state of Q1 through its control pin. When the MCU control pin has no output signal, the gate voltage of Q1 is pulled high by the pull-up resistor R2, keeping Q1 off. At this time, the MCU's ADC input is in a high-impedance state. When the MCU control pin outputs a high-level signal, Q1 turns on, allowing current to flow from the source to the drain, connecting the MCU's ADC input to ground. This allows the MCU to measure the voltage connected to ground through the ADC input. Resistor R1 is used to limit the current from the main battery V1 to the gate of Q1, protecting Q1. Simultaneously, resistor R3, connected between the MCU's ADC input and ground, acts as a voltage divider and filter, protecting the MCU's ADC input. The MCU's ADC input receives the analog signal from Q1 and converts it into a digital signal for the MCU to process.

[0049] Figure 3This is a schematic diagram of the structure of an embodiment of the second voltage monitoring subcircuit of the present application. The second voltage monitoring subcircuit 1 includes a second MOS transistor Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The source of the second MOS transistor Q2 is used to connect to the backup battery V2, the gate of the second MOS transistor Q2 is used to connect to the electromagnetic water meter control chip MCU, the drain of the second MOS transistor Q2 is connected to the fifth resistor R5, one end of the fourth resistor R4 is used to connect to the backup battery V2, and the other end is connected to the gate of the second MOS transistor Q2. One end of the fifth resistor R5 is connected to the drain of the second MOS transistor Q2, and the other end is used to connect to the electromagnetic water meter control chip MCU. One end of the sixth resistor R6 is connected to the fifth resistor R5, and the other end is grounded. The fourth resistor R4 is used to limit the current passing through the second MOS transistor Q2. The fifth resistor R5 and the sixth resistor R6 are used to divide the voltage for the second voltage detection subcircuit.

[0050] Specifically, backup battery V2 serves as a power source, providing energy to the circuit when appropriate. Q2 acts as a switching element, its gate connected to the MCU's control pin via internal circuitry. When the MCU's control pin outputs a high signal, Q2 turns on, allowing current to flow from backup battery V2 through resistor R5 to the MCU's ADC input. Resistor R5 primarily limits the current flowing to the MCU, protecting the ADC input from excessive current. Resistor R4, connected in parallel between Q2's gate and source, stabilizes the gate voltage, ensuring that Q2 responds correctly to the MCU's control signals and preventing damage from excessive gate voltage. Resistor R6, connected between Q2's drain and ground, provides a discharge path for drain current, ensuring that the drain voltage does not rise excessively when Q2 is off, thereby maintaining circuit stability. When the MCU needs to measure the backup battery V2 voltage, it outputs a high signal through its control pin, turning Q2 on. The backup battery V2 voltage is then transmitted through R5 to the MCU's ADC input for analog-to-digital conversion. The MCU can then read the backup battery V2 voltage. On the contrary, when measurement is not required, the MCU outputs a low-level signal, Q2 is turned off, and the connection between the backup battery V2 and the ADC input is cut off, thereby saving energy and protecting the ADC input.

[0051] Figure 4This is a structural diagram of an embodiment of the electronic switch circuit of the present application. In this embodiment, the electronic switch circuit includes a third MOS tube Q3 and a seventh resistor R7. The source of the third MOS tube Q3 is used to connect to the backup battery V2, the gate of the third MOS tube Q3 is used to connect to the electromagnetic water meter control chip MCU, the drain of the third MOS tube Q3 is used to connect to the positive electrode of the fourth low-voltage difference diode D4, one end of the seventh resistor R7 is used to connect to the backup battery V2, and the other end is used to connect to the gate of the third MOS tube Q3. The seventh resistor R7 is used to limit the current passing through the third MOS tube Q3. Specifically, the working principle of the circuit is: the backup battery V2 provides power to the MCU through Q3, and R7 acts as a current-limiting resistor to protect the MCU. The MCU controls its switching state by controlling the gate of Q3, thereby adjusting the circuit power supply.

[0052] The present application also provides an electromagnetic water meter system, which includes the aforementioned power supply circuit, an electromagnetic water meter measurement circuit 5, a data remote transmission circuit 4 for power supply, and an electromagnetic water meter. The electromagnetic water meter system can receive alarm information sent by the data remote transmission circuit 4, thereby reminding staff or users to replace batteries in a timely manner.

[0053] In summary, when the main battery is fully charged, the electromagnetic water meter's measurement circuit and data transmission circuit are both powered by the main battery. If the main battery charge drops, the system automatically switches to backup battery V2 to ensure continuous power to the measurement circuit, maintaining measurement continuity and accuracy. Simultaneously, the MCU monitors the main battery voltage in real time. If it detects a voltage drop, it immediately activates the data transmission circuit and transmits an alarm to the system. Upon receiving the alarm, the system displays a warning indicating that the electromagnetic water meter's main battery may be low, allowing the user to take timely action, such as replacing or recharging the main battery. This prevents the electromagnetic water meter from malfunctioning due to a completely depleted main battery, ensuring the long-term stable operation and accurate measurement of the electromagnetic water meter.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An electromagnetic water meter power supply circuit, characterized in that: The power supply circuit is used to supply power to the electromagnetic water meter measurement circuit and the data remote transmission circuit. The power supply circuit includes a main battery, a backup battery, a low voltage drop linear regulator, an electromagnetic water meter control chip, a first low voltage drop diode, a second low voltage drop diode, a first voltage monitoring subcircuit and a second voltage monitoring subcircuit. The main battery, the first low voltage dropout diode and the electromagnetic water meter control chip are connected in sequence. The main battery is used to connect the electromagnetic water meter measurement circuit and the data remote transmission circuit, and is used to provide the main battery output voltage to the electromagnetic water meter measurement circuit, the data remote transmission circuit and the electromagnetic water meter control chip. The backup battery, the low-voltage dropout linear regulator, the second low-voltage dropout diode and the electromagnetic water meter control chip are connected in sequence, the backup battery is used to output a backup battery output voltage, the low-voltage dropout linear regulator is used to output a stable voltage to the electromagnetic water meter control chip according to the backup battery output voltage, and the stable voltage value of the stable voltage is less than the main battery output voltage value of the main battery output voltage. The main battery, the first voltage monitoring subcircuit and the electromagnetic water meter control chip are connected in sequence, and the first voltage monitoring subcircuit is used to monitor and transmit the main battery output voltage value of the main battery output voltage. The backup battery, the second voltage monitoring subcircuit and the electromagnetic water meter control chip are connected in sequence, the second voltage monitoring subcircuit is used to monitor and transmit the backup battery output voltage value of the backup battery output voltage, and the electromagnetic water meter control chip is used to receive the main battery output voltage value and the backup battery output voltage value.

2. The power supply circuit according to claim 1, wherein: The power supply circuit further includes a third low voltage difference diode, a fourth low voltage difference diode and an electronic switch sub-circuit, The electronic switch subcircuit has a first end, a second end, and a third end. The first end, the anode of the fourth low voltage difference diode, the cathode of the fourth low voltage difference diode, the cathode of the third low voltage difference diode, the anode of the third low voltage difference diode, and the main battery are connected in sequence. The second end is connected to the backup battery. The third end is connected to the electromagnetic water meter control chip. The electromagnetic water meter control chip is provided with a first main battery output voltage value threshold, and the electromagnetic water meter control chip is used to control the opening and closing of the electronic switch subcircuit according to the main battery output voltage value.

3. The power supply circuit according to claim 2, wherein: The electromagnetic water meter control chip is also provided with a second main battery output voltage value threshold and a backup battery output voltage value threshold. The electromagnetic water meter control chip is used to connect to the data remote transmission circuit and to send alarm information to the data remote transmission circuit according to the main battery output voltage value and the backup battery output voltage value.

4. The power supply circuit according to claim 2, characterized in that: The electromagnetic water meter control chip is provided with a frequency parameter, and the electromagnetic water meter control chip is used to periodically control the electronic switch subcircuit to be turned on and off according to the frequency parameter.

5. The power supply circuit according to claim 2, characterized in that: The first voltage monitoring subcircuit includes a first MOS transistor, a first resistor, a second resistor, and a third resistor. The source of the first MOS transistor is used to connect to the main battery, the gate of the first MOS transistor is used to connect to the electromagnetic water meter control chip, the drain of the first MOS transistor is connected to the second resistor, one end of the first resistor is used to connect to the main battery, and the other end is connected to the gate of the first MOS transistor, one end of the second resistor is connected to the drain of the first MOS transistor, and the other end is used to connect to the electromagnetic water meter control chip, one end of the third resistor is connected to the second resistor, and the other end is grounded. The first resistor is used to limit the current passing through the first MOS transistor, and the second resistor and the third resistor are used to divide the voltage of the first voltage monitoring sub-circuit.

6. The power supply circuit according to claim 2, characterized in that: The second voltage monitoring subcircuit includes a second MOS transistor, a fourth resistor, a fifth resistor and a sixth resistor. The source of the second MOS transistor is used to connect to the backup battery, the gate of the second MOS transistor is used to connect to the electromagnetic water meter control chip, the drain of the second MOS transistor is connected to the fifth resistor, one end of the fourth resistor is used to connect to the backup battery, and the other end is connected to the gate of the second MOS transistor. One end of the fifth resistor is connected to the drain of the second MOS transistor, and the other end is used to connect to the electromagnetic water meter control chip. One end of the sixth resistor is connected to the fifth resistor, and the other end is grounded. The fourth resistor is used to limit the current passing through the second MOS transistor, and the fifth resistor and the sixth resistor are used to divide the voltage for the second voltage monitoring sub-circuit.

7. The power supply circuit according to claim 2, wherein: The electronic switch subcircuit includes a third MOS transistor and a seventh resistor. The source of the third MOS transistor is used to connect to the backup battery, the gate of the third MOS transistor is used to connect to the electromagnetic water meter control chip, and the drain of the third MOS transistor is used to connect to the positive electrode of the fourth low-voltage difference diode. One end of the seventh resistor is used to connect to the backup battery, and the other end is used to connect to the gate of the third MOS transistor. The seventh resistor is used to limit the current passing through the third MOS transistor.

8. An electromagnetic water meter system, characterized in that: The electromagnetic water meter system includes the power supply circuit according to any one of claims 1 to 7, and the electromagnetic water meter system also includes the electromagnetic water meter measurement circuit, the data remote transmission circuit power supply, and the electromagnetic water meter.

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