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CN-224204762-U - Fault failure protection circuit for electric energy meter functional module

CN224204762UCN 224204762 UCN224204762 UCN 224204762UCN-224204762-U

Abstract

The utility model provides a fault failure protection circuit of a functional module of an electric energy meter, which comprises a first power supply conversion circuit, a current-limiting control protection circuit and a module communication circuit, wherein the first power supply conversion circuit is connected with the power supply module and the current-limiting control protection circuit and is used for converting direct-current high voltage into direct-current low voltage, the current-limiting control protection circuit is respectively connected with the module communication circuit and an MCU chip U1 and is used for limiting current and protecting the circuit, the communication module circuit is connected with the MCU chip U1 and is used for realizing communication between each functional module and the MCU chip U1, and therefore, when one functional module fails, the MCU chip U1 can control the current-limiting control protection circuit to close the functional module, so that other functional modules of the electric energy meter are not damaged and normal operation of other functional modules of the electric energy meter is ensured.

Inventors

  • XU JUN
  • WANG JUN
  • ZHANG JIONG
  • WANG XIN
  • WU YI
  • WANG YONGXIN

Assignees

  • 青岛乾程科技股份有限公司

Dates

Publication Date
20260505
Application Date
20250424

Claims (7)

  1. 1. The fault failure protection circuit for the electric energy meter functional module is characterized by comprising a power supply module, a first power supply conversion circuit, a current-limiting control protection circuit and a functional module communication circuit; the first power supply conversion circuit is connected with the power supply module and the current-limiting control protection circuit and is used for converting direct-current high voltage into direct-current low voltage; The current-limiting control protection circuit is respectively connected with the functional module communication circuit and the MCU chip U1 and is used for limiting current and protecting the circuit; the functional module communication circuit is connected with the MCU chip U1 and is used for realizing communication between each functional module and the MCU chip U1; the power supply module is connected with the MCU chip U1 and is used for supplying power to the MCU chip U1 and the functional module; The current-limiting control protection circuit comprises a triode QS2, a triode QS3, a capacitor CS4, a resistor RS21, a resistor RS24, a resistor RS25 and a resistor RS26, wherein an emitting electrode of the triode QS2 and one end of the resistor RS24 are jointly connected with the power supply conversion circuit, a collecting electrode of the triode QS2 and one end of the capacitor CS4 are jointly connected with the function module communication circuit, the other end of the capacitor CS4 is grounded, a base electrode of the triode QS2 is connected with one end of the resistor RS21, the other end of the resistor RS21 and the other end of the resistor RS24 are jointly connected with a collecting electrode of the triode QS3, one end of the resistor RS25 and one end of the resistor RS26 are jointly connected with a base electrode of the triode QS3, the other end of the resistor RS25 is jointly connected with an MCU chip U1, and the other end of the resistor RS26 and the emitting electrode of the triode QS3 are jointly grounded.
  2. 2. The fault failure protection circuit of a functional module of an electric energy meter according to claim 1, wherein the power conversion circuit comprises a capacitor CQ1, a capacitor CQ2, a capacitor EC11 and a chip UQ4, wherein one end of the capacitor CQ1 and a pin 2 of the chip UQ4 are commonly connected to the power module, the other end of the capacitor CQ1 and the pin 1 of the chip UQ4, one end of the capacitor CQ2 and one end of the capacitor EC11 are commonly grounded, and the pin 3 of the chip UQ4, the other end of the capacitor CQ2 and the other end of the capacitor EC11 are commonly connected to a current limiting protection control circuit.
  3. 3. The electrical energy meter functional module failure protection circuit of claim 1, wherein the functional module is a bluetooth module or an RF wireless module.
  4. 4. The fault failure protection circuit for a functional module of an electric energy meter according to claim 3, wherein when the functional module is a BlueTooth module, the communication circuit for the functional module comprises a resistor RB1, a resistor RB13, a resistor RB19, a resistor RB2, a resistor RB3, a resistor RB4, a capacitor CB1, a capacitor CB7, a capacitor CB16 and a chip BLE1, wherein one end of the resistor RB1 and one end of the resistor RB13 are commonly connected with a current limiting control protection circuit, the other end of the resistor RB1 and one end of the resistor RB2 are commonly connected with a 68 pin of the MCU chip U1 to send a signal TX_BlueTooth, the other end of the resistor RB2 is connected with a 5 pin of the chip BLE1, the other end of the resistor RB13 and one end of the resistor RB4 are commonly connected with a 63 pin of the MCU chip U1, the other end of the resistor RB4 and one end of the capacitor CB7 are commonly connected with a 4 pin 1 of the chip BLE1, the other end of the capacitor CB7 is grounded, one end of the other end of the resistor RB3 is commonly connected with one end of the capacitor CB1, one end of the other end of the resistor RB3 is commonly connected with the other end of the capacitor CB1, the other end of the resistor RB 6 is commonly connected with the other end of the capacitor RB1, and one end of the other end of the resistor RB1 is commonly connected with the other end of the capacitor BLE1 is connected with the capacitor BLE1, and one end of the other end of the capacitor BLE1 is 16 is commonly connected with the other end of the capacitor BLE1, and the other end of the capacitor is1 is connected with the capacitor BLE 1.
  5. 5. The fault failure protection circuit of a functional module of an electric energy meter according to claim 3, wherein when the functional module is an RF wireless module, the functional module communication circuit comprises a chip UR1, a capacitor CT5, a capacitor CT6, a capacitor CT1, a resistor RT5 and an antenna, one end of the resistor RT5 and one end of the capacitor CT6 are commonly connected with a2 pin of the chip UR1, the other end of the RT5 is connected with one end of the capacitor CT5 and the antenna, the other end of the capacitor CT5 and the other end of the capacitor CT6 are commonly grounded, one end of the capacitor CT1 and the 5 pin of the chip UR1 are commonly connected with a current limiting control protection circuit, the other end of the capacitor CT1 and the 6 pin of the chip UR1 are commonly grounded, the 8 pin of the chip UR1 is connected with a 67 pin of the MCU U1 to receive a signal rx_etoth, the 7 pin of the chip UR1 is connected with a 68 pin of the MCU U1 to transmit a signal TX BlueTooth, and the pins UR1, 10, 4 are grounded.
  6. 6. The fault failure protection circuit of the power meter functional module according to claim 1, further comprising a second power conversion circuit, wherein the second power conversion circuit is connected with the power module and the MCU chip U1 and is used for converting direct-current high voltage into direct-current low voltage so as to provide electric energy for the MCU chip U1.
  7. 7. The fault and failure protection circuit of a functional module of an electric energy meter according to claim 6, wherein the second power conversion circuit comprises a chip UQ1, a capacitor CN25, a capacitor CN26, a capacitor CN27 and a diode DN21, wherein a3 pin of the chip UQ1 and one end of the capacitor CN26 are commonly connected with the power module, one end of the capacitor CN25, one end of the capacitor CN27 and one end of the diode DN21 are commonly connected with a1 pin of the chip UQ1, the other end of the diode DN21 is connected with an MCU chip U1, and the other end of the capacitor CN25, the other end of the capacitor CN27, the other end of the capacitor CN26 and the 2 pin of the chip UQ1 are commonly grounded.

Description

Fault failure protection circuit for electric energy meter functional module Technical Field The application relates to the technical field of electric energy meters, in particular to a fault failure protection circuit of a functional module of an electric energy meter. Background There are typically many different types of functional modules in the embedded hardware system of the electric energy meter, such as a wideband and narrowband carrier module, a bluetooth module, an RF wireless communication module, etc. The common characteristics of the modules are that the power consumption is larger, when the modules are failed by short-circuit faults or other faults, the power supply is greatly lost, meanwhile, the functions of the electric energy meter system are damaged or abnormal, for example, the electric energy meter is likely to be dead and dead due to black screen, the electric energy meter cannot accurately measure, the power consumption of the electric energy meter is increased, the line loss is increased, the functions of other systems of the electric energy meter are abnormal, and the like. Therefore, when one functional module fails, the electric energy meter needs to be protected from other functional modules, and the electric energy meter can continue to work. Disclosure of utility model In order to solve the technical problems, the application provides a fault failure protection circuit of a functional module of an electric energy meter, which comprises a power module, a first power conversion circuit, a current-limiting control protection circuit and a functional module communication circuit; the first power supply conversion circuit is connected with the power supply module and the current-limiting control protection circuit and is used for converting direct-current high voltage into direct-current low voltage; The current-limiting control protection circuit is respectively connected with the functional module communication circuit and the MCU chip U1 and is used for limiting current and protecting the circuit; the functional module communication circuit is connected with the MCU chip U1 and is used for realizing communication between each functional module and the MCU chip U1; The power module is connected with the MCU chip U1 and is used for supplying power to the MCU chip U1 and the functional module. In some embodiments of the present application, the power conversion circuit includes a capacitor CQ1, a capacitor CQ2, a capacitor EC11, and a chip UQ4, where one end of the capacitor CQ1 and the 2 pin of the chip UQ4 are commonly connected to the power module, the other end of the capacitor CQ1 and the 1 pin of the chip UQ4, one end of the capacitor CQ2, and one end of the capacitor EC11 are commonly grounded, and the 3 pin of the chip UQ4, the other end of the capacitor CQ2, and the other end of the capacitor EC11 are commonly connected to the current-limiting protection control circuit. In some embodiments of the present application, the current limiting control protection circuit includes a triode QS2, a triode QS3, a capacitor CS4, a resistor RS21, a resistor RS24, a resistor RS25 and a resistor RS26, where an emitter of the triode QS2 and one end of the resistor RS24 are commonly connected to the power conversion circuit, a collector of the triode QS2 and one end of the capacitor CS4 are commonly connected to the functional module communication circuit, another end of the capacitor CS4 is grounded, a base of the triode QS2 is connected to one end of the resistor RS21, another end of the resistor RS21 and another end of the resistor RS24 are commonly connected to a collector of the triode QS3, one end of the resistor RS25 and one end of the resistor RS26 are commonly connected to a base of the triode QS3, another end of the resistor RS25 is connected to the chip U1, and another end of the resistor RS26 and the emitter of the triode QS3 are commonly grounded. In some embodiments of the present application, the functional module may be a bluetooth module or an RF wireless module. In some embodiments of the present application, when the function module is a BlueTooth module, the function module communication circuit includes a resistor RB1, a resistor RB13, a resistor RB19, a resistor RB2, a resistor RB3, a resistor RB4, a capacitor CB1, a capacitor CB7, a capacitor CB16, and a chip BLE1, wherein one end of the resistor RB1 is commonly connected to a current limiting control protection circuit with one end of the resistor RB13, the other end of the resistor RB1 is commonly connected to a 68 pin of the MCU chip U1 with one end of the resistor RB2 to transmit a signal tx_bluetooth, the other end of the resistor RB2 is commonly connected to a 5 pin of the chip BLE1, the other end of the resistor RB13 is commonly connected to a 63 pin RST of the MCU chip U1 with one end of the resistor RB4, the other end of the resistor RB4 is commonly connected to a 4 pin RST1 of the chip BLE CB7, the other en