CN209894881U

CN209894881U - Three-phase intelligent electric energy meter based on AC-DC high-frequency conversion power supply

Info

Publication number: CN209894881U
Application number: CN201920557836.XU
Authority: CN
Inventors: 姚诚; 孙雯; 吴晓政; 张鹏飞; 周立; 商丽君
Original assignee: Zhejiang Bada Electronic Instrument Co Ltd
Current assignee: Zhejiang Bada Electronic Instrument Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-01-03
Anticipated expiration: 2029-04-23

Abstract

The embodiment provides a three-phase intelligent electric energy meter based on an AC-DC high-frequency conversion power supply, which comprises a main control module for realizing three-phase metering and data communication and a power supply module for supplying power to the main control module; the main control module is also connected with a three-phase metering module for metering and a storage module for storing metering data, and is also provided with an integrated three-phase magnetic latching relay HFE45, an HPLC (high performance liquid chromatography) module for data transmission in the intelligent electric energy meter and an ESMA (electronic security and authentication) module for encrypting data transmitted in the intelligent electric energy meter; the main control module is also connected with a display module for displaying the working state of the intelligent electric energy meter, an infrared module for realizing data transmission, a 485 module and a clock module for providing reference time; the power conversion efficiency is improved by adopting an AC/DC high-frequency conversion power supply technology, the running power consumption of the whole machine is reduced by adopting a reasonable power supply management framework, various communication modes and communication protocols are compatible, the metering precision is high, and the requirement of safety fee control is met.

Description

Three-phase intelligent electric energy meter based on AC-DC high-frequency conversion power supply

Technical Field

The utility model belongs to the electric energy meter field especially relates to three-phase intelligent electric energy meter based on AC-DC high frequency conversion power.

Background

At present, the three-phase electric energy meter power supply operated on the grid in China generally adopts a three-phase line transformer mode to supply power. The linear transformer has low power conversion efficiency, and the efficiency of the common full-load work is only about 60-70%; the narrow operating voltage range generally has an operating voltage of (160- & lt380- & gt) V.

With the advance of national grid intelligent power, the power grid has higher requirements on the power consumption and voltage working range of the on-grid running electric energy meter. The development of the intelligent electric energy meter is limited by the obvious defects of heavy volume, low conversion efficiency, large heat generation and the like of the linear voltage-stabilized power supply; the current power supply mode of the linear transformer can not meet the requirements of power grid detection and on-grid operation gradually.

SUMMERY OF THE UTILITY MODEL

In order to solve the shortcoming and the not enough that exist among the prior art, the utility model provides a three-phase intelligent ammeter based on AC-DC high frequency conversion power improves power conversion efficiency and reasonable power management framework through adopting AC/DC high frequency conversion power technology and reduces complete machine operation consumption, compatible multiple communication mode and communication protocol, and measurement accuracy is high, satisfy the requirement of safe expense accuse.

Specifically, three-phase intelligent ammeter based on AC-DC high frequency conversion power supply, three-phase intelligent ammeter includes:

the system comprises a main control module for realizing three-phase metering and data communication and a power supply module for supplying power to the main control module;

the main control module is also connected with a three-phase metering module for metering and a storage module for storing metering data, and is also provided with an integrated three-phase magnetic latching relay HFE45, an HPLC (high performance liquid chromatography) module for data transmission in the intelligent electric energy meter and an ESMA (electronic security and authentication) module for encrypting data transmitted in the intelligent electric energy meter;

the main control module is also connected with a display module for displaying the working state of the intelligent electric energy meter, an infrared module for realizing data transmission, a 485 module and a clock module for providing reference time;

the power supply module converts an input AC high-frequency power supply into two groups of voltages V1 and V2 which are isolated from each other, the voltage V1 is subjected to voltage conversion by a chip AOZ1282CI power supply chip to obtain 6.7V voltage, the 6.7V voltage is processed by a power failure detection chip U10 to generate a power failure signal PFI, and the power failure signal PFI is output to the main control module;

the 6.7V voltage is also connected to the input end of a voltage stabilizer U11 through a diode D8, the output end of U11 is respectively connected to the ground through an MOS tube Q4MOS tube Q5 and an MOS tube Q6, the grid of the MOS tube Q4 is connected with the end pin of LCD1& MEM _ Pwr _ Ctrl in the main control module, the grid of the MOS tube Q5 is connected with the end pin of IrDA _ Pwr _ Ctrl in the main control module, and the grid of the MOS tube Q6 is connected with the end pin of ESAM _ Pwr _ Ctrl in the main control module.

Optionally, in the power supply module:

the 6.7V voltage is grounded through capacitors C40 and C41 before being transmitted to a diode D8, a U _ SMP _ BKUp _ BAT terminal pin in the main control module is sequentially connected with the input end of U11 through resistors R140, R138 and R137 and a diode D9, one end of the R140, far away from the terminal pin of the main control module, is grounded through a capacitor C44 and a polarity capacitor E4, and the output end of the U11 is connected to the anode of the diode D9 through a capacitor C49 and a power supply BT 1;

the output end of the U11 is grounded through a polar capacitor E5, a capacitor C51 is connected in parallel with two ends of a polar capacitor E5, the positive electrode of the polar capacitor E5 is connected to the drain electrode of an MOS tube Q3, the source electrode of the MOS tube Q3 grounds capacitors C42, C43 and C45 which are connected in parallel, and the grid electrode of the MOS tube Q3 is connected with an ADE _ Pwr _ Ctrl terminal pin of the main control module.

Optionally, the clock module includes a high-precision RX8025T chip, and pins INTA, INTB, SCL, and SDA of the RX8025T chip are all connected to a system power supply VDD33 via a resistor R12.

Optionally, the memory module includes a chip UC8, the chip UC8 is connected to the CPU through an SPI bus, pin 15 of UC8 is connected to pin DF _ SI of the CPU, pin 16 of UC8 is connected to pin DF _ SCK of the CPU, pin 7 of UC8 is connected to pin DF _ CS of the CPU, pin 8 of UC8 is connected to pin DF _ SO of the CPU, pin 2 of UC8 is connected to power signals V _ LCD1& MEM, and pin 10 of UC8 is connected to ground.

Optionally, the 485 module includes a communication chip ISL3152, a VCC end of the 485 communication chip is connected to the V485 port, the VCC end of the 485 communication chip is further connected to the DGND through a capacitor C5, a resistor R35, a zener diode TVS1 and a resistor R34 are sequentially disposed between the GND end and the VCC end of the 485 communication chip, a pin 1 of the 485 communication chip is connected to a second control end of the optocoupler O6 through a capacitor C20 and a resistor R32 which are connected in parallel,

pins

2 and 3 of the 485 communication chip are simultaneously connected to a second controlled end of the optocoupler O7, a pin 4 of the 485 communication chip is connected to a second controlled end of the optocoupler O7 through a resistor R33 and is simultaneously grounded, and a first control end of the optocoupler O6 is connected to a first controlled end of the optocoupler O7 through a resistor R31; the second controlled end of the optical coupler O6 is grounded, the first controlled end of the optical coupler O6 is connected with a system power supply VDD33 through a resistor R28 and is simultaneously connected with a 485_ RXD pin of the MCU main control module, the first control end of the optical coupler O7 is connected with a system power supply VDD33 through a resistor R29, the second control end of the optical coupler O7 is connected with a 485_ TXD pin of the MCU main control module through a resistor R30, and two ends of the resistor R30 are connected with a capacitor C19 in parallel.

Optionally, the infrared module includes an infrared receiving circuit and an infrared transmitting circuit, wherein

The infrared receiving circuit comprises an infrared receiving triode U14, a VCC end of U14 is connected with a system power supply VDD33 through a resistor R72, an OUT end of U14 is connected with a rDA _ RXD pin of the MCU main control module and is connected with a system power supply VDD33 through a resistor R73, and a GND end of U14 is grounded;

the infrared transmitting circuit comprises an infrared transmitting diode DS1, one end of the infrared transmitting diode DS1 is connected with a triode Q6, the other end of the infrared transmitting circuit is connected with a triode Q7 through a resistor R75, a pin 1 of the triode Q6 is connected with a VDD33, a pin 2 is connected with a rDA _ TXD pin of the MCU main control module, and a pin 2 of the triode Q7 is connected with a rDA _38KHz pin of the MCU main control module.

Optionally, the HPLC module includes a BD-KDZBSX _016 three-phase table broadband carrier HPLC module.

Optionally, the display module includes a liquid crystal display circuit and an indicator light indicating circuit;

the liquid crystal display driving chip UY4 adopts a BU97950FUV chip of ROHM company, the liquid crystal screen UY5 adopts M9384, and the power supply voltage is 5V;

one end of an alarm indicator lamp D14 in the indicator lamp display circuit is connected with the ground, the other end of the alarm indicator lamp D14 is turned on when the Show _ Ctrl pin outputs a high level, the alarm indicator lamp D14 is a yellow indicator lamp, the yellow indicator lamp is turned on when an alarm signal is generated on a three-phase meter, one end of an active indicator lamp D13 is grounded, the other end of the active indicator lamp D13 is connected with the 3 rd pin of a triode Q8 through a resistor R154, the 2 nd pin of the Q8 is connected with the ADE _ CF1 pin of the three-phase metering module, when the three-phase metering module outputs an active signal, the D13 is turned on, and the D13 is a red signal indicator lamp; one end of a reactive indicator lamp D15 is grounded, the other end of the reactive indicator lamp is connected with the 3 rd pin of the triode Q9 through the resistor R157, the 2 nd pin of the Q9 is connected with the ADE _ CF2 pin of the three-phase metering module, when the three-phase metering module has active signal output, the D15 is lightened, and the D15 is a red signal indicator lamp.

Optionally, a three-phase metering chip in the three-phase metering module adopts ADE7858, the metering chip ADE7858 and a 16.384 crystal oscillator form a minimum system, the three-phase metering module performs data communication with the MCU through SPI communication, a 37 th pin is connected with an ADE _ SO pin of the CPU, a 38 th pin is connected with an ADE _ SI pin of the CPU, a 36 th pin is connected with an ADE _ SCK pin of the CPU, a 39 th pin is connected with an ADE _ CS pin of the CPU, a 4 th pin is connected with an ADE _ R \ S \ T \ pin of the CPU, a 29 th pin is connected with an ADE _ I \ R \ Q \0\ pin of the CPU, a 32 th pin is connected with an ADE _ I \ R \ Q \1 pin of the CPU, a 32 th pin is connected with an indicator light signal ADE _ CF1 of the display module, a 33 th pin is connected with an indicator light signal ADE _ CF1 of the display module, and a 34 th pin is connected with an indicator light signal ADE _ CF2 of the display module.

Optionally, the chip UE1 in the ESMA module adopts SGC1118B, pin 1 of UE1 is grounded, pin 2 and pin 7 are connected to an ESMA _ SDI pin of the CPU, pin 3 and pin 6 are connected to an ESAM _ SDO pin of the CPU, pin 4 is connected to an EAAM _ C \ S \ pin of the CPU, pin 5 is connected to an ESAM _ CLK pin of the CP, pin 8 is connected to an ESMA power supply pin, and pin ESAM _ Pwr _ Ctrl of the MCU in the main control module is connected to a 2 nd pin of the triode QE1 and is connected to a power supply of 33 through a resistor RE 1.

Optionally, the main control module includes an MCU chip HT6025, a peripheral crystal oscillator circuit, and a power-down detection chip; the MCU chip carries out data communication with the real-time clock module through the IIC bus; carrying out data communication with the 485 communication circuit through a UART serial port; carrying out data communication with the HPLC module through a UART serial port; the infrared module is connected with the UART serial port; carry out data communication through SPI bus and storage module, carry out data communication through liquid crystal driver chip control liquid crystal display module, carry out data communication through UART serial ports and smart card module, carry out data communication through SPI bus and ESMA module.

The utility model provides a beneficial effect that technical scheme brought is:

the power conversion efficiency is improved by adopting an AC/DC high-frequency conversion power supply technology, the running power consumption of the whole machine is reduced by adopting a reasonable power supply management framework, various communication modes and communication protocols are compatible, the metering precision is high, and the requirement of safety fee control is met.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural block diagram of a three-phase intelligent electric energy meter based on an AC-DC high-frequency conversion power supply according to an embodiment of the present application;

fig. 2 is a schematic circuit diagram of a power module according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of a clock module according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of a memory module according to an embodiment of the present disclosure;

fig. 5 is a schematic circuit structure diagram of a 485 module according to an embodiment of the present disclosure;

fig. 6(a) is a schematic circuit structure diagram of an infrared receiving circuit according to an embodiment of the present application;

fig. 6(b) is a schematic circuit structure diagram of an infrared transmitting circuit according to an embodiment of the present application;

fig. 7(a) is a first schematic circuit diagram of an indicator circuit according to an embodiment of the present disclosure;

fig. 7(b) is a schematic circuit structure diagram of an indicator light circuit according to an embodiment of the present application;

fig. 7(c) is a schematic circuit diagram of a third exemplary embodiment of an indicator circuit;

fig. 8 is a schematic circuit diagram of an ESMA module according to an embodiment of the present application.

Detailed Description

In order to make the structure and advantages of the present invention clearer, the structure of the present invention will be further described with reference to the accompanying drawings.

Example one

The three-phase intelligent electric energy meter adopts the AC/DC high-frequency conversion power supply technology to improve the power conversion efficiency and a reasonable power supply management framework to reduce the running power consumption of the whole machine, is compatible with various communication modes and communication protocols, has high metering precision and meets the requirement of safety cost control. The three-phase electric energy metering management which is more economical, reliable and safe can be provided. The hardware work block diagram of the three-phase intelligent electric energy meter.

Three-phase intelligent electric energy meter based on AC-DC high frequency conversion power supply, three-phase intelligent electric energy meter includes:

the main control module is also connected with a three-phase metering module for metering and a storage module for storing metering data, and is also provided with an integrated three-phase magnetic latching relay HFE45, an HPLC (high performance liquid chromatography) module for data transmission in the intelligent electric energy meter and an ESMA (electronic security and authentication) module for encrypting data transmitted in the intelligent electric energy meter; the main control module is also connected with a display module for displaying the working state of the intelligent electric energy meter, an infrared module for realizing data transmission, a 485 module and a clock module for providing reference time;

the AC/DC high frequency conversion power used in this embodiment provides power supply for the main control module. The digital flyback switching power supply is adopted to replace the traditional linear voltage-stabilized power supply, so that the power supply conversion efficiency of the system is effectively improved, the hardware volume of the system is reduced, and the heating of the system is reduced; the input power amplifier can work under the ultra-wide input voltage of 80-500Vac, the input working efficiency is not less than 75% when Vin is 220Vac, Io is 100%, and Ta is 25 ℃, and the maximum input power efficiency can reach 95%. Meanwhile, the power supply has an input side overvoltage shutdown protection function, and when the input voltage exceeds a set value, the power supply automatically stops working, so that the stress borne by the switch MOSFET is reduced, the probability of power supply damage under high-voltage input is reduced, and the reliability of the system is improved. Meanwhile, a micro-current starting low-power consumption technology is adopted, so that the three-phase meter has the characteristics of high efficiency and low standby power consumption. The magnetic latching relay module adopts a built-in integrated three-phase magnetic latching relay HFE45, and the relay meets the requirement of executing breaking under the condition of maximum current of 80A. After a switch breaking instruction is received, the simultaneous breaking of three-phase current is guaranteed from a hardware structure, the phase-lacking operation of the motor is avoided, and the purpose of safety cost control is achieved.

The power supply module converts an input AC high-frequency power supply into two groups of voltages V1 and V2 which are isolated from each other, the voltage V1 is subjected to voltage conversion by a chip AOZ1282CI power supply chip to obtain 6.7V voltage, the 6.7V voltage is processed by a power failure detection chip U10 to generate a power failure signal PFI, and the power failure signal PFI is output to the main control module; the 6.7V voltage is also connected to the input end of a voltage stabilizer U11 through a diode D8, the output end of U11 is grounded through an MOS tube Q4, an MOS tube Q5 and an MOS tube Q6, the grid of the MOS tube Q4 is connected with the end pin of the LCD1& MEM _ Pwr _ Ctrl in the main control module, the grid of the MOS tube Q5 is connected with the end pin of the IrDA _ Pwr _ Ctrl in the main control module, and the grid of the MOS tube Q6 is connected with the end pin of the ESAM _ Pwr _ Ctrl in the main control module. The element adopted by the MOS transistor Q4, the MOS transistor Q5 and the MOS transistor Q6 is SSM3K 304T.

As shown in fig. 2, before the voltage of 6.7V is transmitted to the diode D8, the voltage is grounded through the capacitors C40 and C41, the U _ SMP _ BkUp _ BAT terminal pin in the main control module is sequentially connected to the input end of U11 through the resistors R140, R138, R137 and the diode D9, one end of R140, which is far away from the terminal pin of the main control module, is grounded through the capacitor C44 and the polarity capacitor E4, and the output end of U11 is connected to the anode of the diode D9 through the capacitor C49 and the power supply BT 1; the output end of the U11 is grounded through a polar capacitor E5, a capacitor C51 is connected in parallel with two ends of a polar capacitor E5, the positive electrode of the polar capacitor E5 is connected to the drain electrode of an MOS tube Q3, the source electrode of the MOS tube Q3 grounds capacitors C42, C43 and C45 which are connected in parallel, and the grid electrode of the MOS tube Q3 is connected with an ADE _ Pwr _ Ctrl terminal pin of the main control module.

The power supply V1 performs voltage conversion through the AOZ1282CI power supply chip. The voltage of 6.7V is divided and adjusted to be output by the voltage dividing resistors R129, R130 and R131. The output 6.7V power supply is connected with the 5 th pin of the power failure detection chip U10 through R132 and R133 voltage division, and the 4 th pin of U10 is grounded through R134 and R135. And meanwhile, outputting a power-down signal PFI to be connected with a PFI pin of the CPU. When the PFI pin is at high level, the three-phase meter is indicated to work in a mains supply state, and when the PFI pin is at low level, the three-phase meter is indicated to be in a power-down state. The 6.7V power supply is connected with a pin 3 of the U11 through a diode D8, a pin 1 of the U11 is grounded, and a pin 2 outputs a power supply VDD 33; the 1 st pin of the Mos tube Q4 is connected with VDD33, the 2 nd pin outputs power supply V _ LCD1& MEM, and the 3 rd pin is connected with LCD1& MEM _ Pwr _ Ctrl pin of the CPU; the 1 st pin of the Mos tube Q5 is connected with VDD33, the 2 nd pin outputs a power supply V _ IrDA, and the 3 rd pin is connected with an IrDA _ Pwr _ Ctrl pin of the CPU; the 1 st pin of the Mos tube Q6 is connected with VDD33, the 2 nd pin outputs a power supply V _ ESAM, and the 3 rd pin is connected with an ESAM _ Pwr _ Ctrl pin of the CPU; the 1 st pin of the Mos tube Q3 is connected with VDD33, the 2 nd pin outputs a power supply V _ ADE, and the 3 rd pin is connected with an E ADE _ Pwr _ Ctrl pin of the CPU; the 1 st pin of the U12 is connected to the V1, the 2 nd pin is grounded, the 3 rd pin is connected to the LCD2_ Pwr _ Ctrl of the CPU, and the 5 th pin outputs the power supply V _ LCD 2.

Circuit principle control description of power management:

when the pins LCD1& MEM _ Pwr _ Ctrl of the MCU in the master control module output high level, the Mos tube Q4 is turned on to output V _ LCD1& MEM to be 3.3V, when the pins LCD1& MEM _ Pwr _ Ctrl of the MCU in the master control module output low level, the level Mos tube Q4 is turned off, and the power supply V _ LCD1& MEM is 0V. The power supply V _ LCD1& MEM provides working power supply for the memory module, the liquid crystal driving chip, the liquid crystal IO, and the like. The Mos tube Q4 selects a chip SSM3K 304T;

when the pin rDA _ Pwr _ Ctrl of the MCU in the main control module outputs a high level, the Mos tube Q5 turns on to output V _ IrDA of 3.3V, and when the pin LCD1& MEM _ Pwr _ Ctrl of the MCU in the main control module outputs a low level, the Mos tube Q5 turns off, and the power supply V _ IrDA is 0V. And the power supply V _ IrDA provides a working power supply for the infrared module. The Mos tube Q5 selects a chip SSM3K 304T;

when the pin ESAM _ Pwr _ Ctrl of the MCU in the main control module outputs a high level, the Mos tube Q6 is conducted to output V _ ESAM of 3.3V, when the pin ESAM _ Pwr _ Ctrl of the MCU in the main control module outputs a low level, the level Mos tube Q6 is cut off, and the power supply V _ ESAM is 0V. The power supply V _ ESAM provides working power supply for the ESMA module. The Mos tube Q6 selects a chip SSM3K 304T;

when the pin 485_ Pwr _ Ctrl of the MCU in the main control module outputs a high level, the Mos tube Q27 turns on to output V _485 of 3.3V, and when the pin 485_ Pwr _ Ctrl of the MCU in the main control module outputs a low level, the Mos tube Q6 turns off, and the power supply V _485 is 0V. And the power supply V _485 provides a working power supply for the 485 module. The Mos tube Q27 selects a chip SSM3K 304T;

when the pin LCD2_ Pwr _ Ctrl of the MCU in the main control module outputs high level, the output V _ LCD2 is 5V, and when the pin LCD2_ Pwr _ Ctrl of the MCU in the main control module outputs low level, the power supply V _ LCD2 is 0V. The power supply V _ LCD2 provides operating power for the liquid crystal module backlight. The U12 chip used S-1167B 50.

Optionally, as shown in fig. 3, the clock module includes a high-precision RX8025T chip, and the INTA, INTB, SCL, and SDA pins of the RX8025T chip are all connected to the system power supply VDD33 via a resistor R12; the daily timing error of the timing unit is less than or equal to +/-0.5 s/d.

Optionally, as shown in fig. 4, the memory module includes a chip UC8, the chip UC8 is connected to the CPU through an SPI bus, pin 15 of UC8 is connected to pin DF _ SI of the CPU, pin 16 of UC8 is connected to pin DF _ SCK of the CPU, pin 7 of UC8 is connected to pin DF _ CS of the CPU, pin 8 of UC8 is connected to pin DF _ SO of the CPU, pin 2 of UC8 is connected to power signals V _ LCD1& MEM, and pin 10 of UC8 is connected to ground. By selecting the serial FLASH with large capacity, the corresponding data and parameter storage can be reasonably configured, and various data can be stored according to different freezing and task requirements.

Optionally, as shown in fig. 5, the 485 module includes a communication chip ISL3152, a VCC end of the 485 communication chip is connected to the V485 port, a VCC end of the 485 communication chip is further connected to the DGND through a capacitor C5, a resistor R35, a zener diode TVS1, and a resistor R34 are sequentially disposed between the GND end and the VCC end of the 485 communication chip, a pin 1 of the 485 communication chip is connected to a second control end of the optocoupler O6 through a parallel capacitor C20 and a resistor R32, pins 2 and 3 of the 485 communication chip are simultaneously connected to a second controlled end of the optocoupler O7, a pin 4 of the 485 communication chip is connected to a second controlled end of the optocoupler O7 through a resistor R33 and is simultaneously grounded, and a first control end of the optocoupler O6 is connected to a first controlled end of the optocoupler O7 through a resistor R31; the second controlled end of the optical coupler O6 is grounded, the first controlled end of the optical coupler O6 is connected with a system power supply VDD33 through a resistor R28 and is simultaneously connected with a 485_ RXD pin of the MCU main control module, the first control end of the optical coupler O7 is connected with a system power supply VDD33 through a resistor R29, the second control end of the optical coupler O7 is connected with a 485_ TXD pin of the MCU main control module through a resistor R30, and two ends of the resistor R30 are connected with a capacitor C19 in parallel.

The 485 communication module adopts a 485 chip ISL3152 and exchanges data with the CPU through a UART serial port.

The 485 circuit has the advantages that the baud rate supports 2400-.

Optionally, the infrared module includes an infrared receiving circuit shown in fig. 6(a) and an infrared transmitting circuit shown in fig. 6(b), where the infrared receiving circuit includes an infrared receiving transistor U14, a VCC terminal of U14 is connected to a system power supply VDD33 through a resistor R72, an OUT terminal of U14 is connected to a rDA _ RXD pin of the MCU master control module and is connected to a system power supply VDD33 through a resistor R73, and a GND terminal of U14 is grounded;

The infrared debugging circuit supports the palm computer to read the data of the converter. The data of the electric energy meter can be read in real time.

Optionally, the HPLC module includes a BD-KDZBSX _016 three-phase table broadband carrier HPLC module. The module is a broadband OFDM power line carrier communication module which is specially designed by taking a power line medium as a communication channel, a broadband carrier processing chip used by the module is a high-integration Soc chip, a 65-nanometer manufacturing process is adopted, an analog front end, a baseband modulation and demodulation, a digital signal processing, a CPU inner core and rich functional peripherals are perfectly integrated, and complete power line communication solutions such as a physical layer (PHY), a medium access control layer (MAC), an adaptation layer (ADP), a network layer (NET), an application layer (APP) and the like are provided. The broadband carrier communication chip realizes a reliable data exchange core module between electronic terminal equipment based on a power line communication network, has the functions of a frame relay forwarding strategy, signal strength indication, phase detection, automatic rate/power adjustment, self-adaptive message framing, a perfect network data communication protocol set and the like, and has the characteristics of high communication rate, high communication reliability, low cost, low power consumption, few peripheral devices and the like.

Optionally, as shown in fig. 7, the display module includes a liquid crystal display circuit and an indicator light indicating circuit;

as shown in fig. 7(a), 7(b), and 7(c), respectively, an alarm indicator D14 in the indicator display circuit has one end connected to ground and the other end connected to the Show _ Ctrl pin of the CPU through a resistor R155, when the Show _ Ctrl pin outputs a high level, the alarm indicator D14 is turned on and turned off when the Show _ Ctrl pin outputs a low level, D14 is a yellow indicator, when an alarm signal is generated in the three-phase meter, the yellow indicator is turned on, one end of the active indicator D13 is grounded, the other end is connected to the 3 rd pin of the transistor Q8 through a resistor R154, the 2 nd pin of Q8 is connected to the ADE _ CF1 pin of the three-phase metering module, when the three-phase metering module has an active signal output, D13 is turned on, and D13 is a red indicator; one end of a reactive indicator lamp D15 is grounded, the other end of the reactive indicator lamp is connected with the 3 rd pin of the triode Q9 through the resistor R157, the 2 nd pin of the Q9 is connected with the ADE _ CF2 pin of the three-phase metering module, when the three-phase metering module has active signal output, the D15 is lightened, and the D15 is a red signal indicator lamp.

Voltage sampling is carried out through a resistance voltage division mode, and current signal sampling is carried out through a difference mode. The sampling of the A-phase current is performed in a parallel-connection serial-connection mode of four high-precision low-temperature drifts R13, R14, R15 and R16, so that the sampling precision is adjusted to be the highest, and the influence of temperature and external factors on error measurement is reduced. A. B, C the voltage and current sampling modes of the three-way signals are consistent. The metering sampling scheme can ensure that the error fluctuation range is in the minimum range under the environment temperature change of-40 to 75 ℃, improves the metering sampling precision and meets the sampling error requirement of a national grid three-phase metering 0.2-level table.

Optionally, as shown in fig. 8, the chip UE1 in the ESMA module adopts SGC1118B, pin 1 of UE1 is grounded, pin 2 and pin 7 are connected to an ESMA _ SDI pin of the CPU, pin 3 and pin 6 are connected to an ESAM _ SDO pin of the CPU, pin 4 is connected to an EAAM _ C \ S \ pin of the CPU, pin 5 is connected to an ESAM _ CLK pin of the CP, pin 8 is connected to an ESMA power supply pin, and pin ESAM _ Pwr _ Ctrl of the MCU in the main control module is connected to pin 2 of the triode QE1 and is connected to a VDD33 power supply through a resistor RE 1.

When the ESAM _ Pwr _ Ctrl outputs high level, the ESAM power supply is turned on, and the low level is the ESAM power supply is turned off. The power supply can be turned on only in the communication process through the CPU control, and the power supply is turned off in the non-communication state, so that the power and the reliability of the whole machine are reduced.

The power failure detection circuit consists of an MCU chip HT6025, a peripheral crystal oscillator circuit and a power failure detection chip. The peripheral crystal oscillator adopts an 8M crystal oscillator, and the power failure detection chip adopts S-80126CLMC-JIZ to reset the MCU when the system voltage is lower than 2.93V, so that the system reliability is improved. The MCU chip carries out data communication with the real-time clock module through the IIC bus; carrying out data communication with the 485 communication circuit through a UART serial port; carrying out data communication with the HPLC module through a UART serial port; the infrared module is connected with the UART serial port; carry out data communication through SPI bus and storage module, carry out data communication through liquid crystal driver chip control liquid crystal display module, carry out data communication through UART serial ports and smart card module, carry out data communication through SPI bus and ESMA module.

The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. Three-phase intelligent ammeter based on AC-DC high frequency conversion power supply, its characterized in that, three-phase intelligent ammeter includes:

2. The AC-DC high frequency conversion power supply based three-phase intelligent electric energy meter according to claim 1, wherein in the power supply module:

3. The AC-DC high frequency conversion power supply-based three-phase intelligent electric energy meter according to claim 1, wherein the clock module comprises a high-precision RX8025T chip, and the INTA, INTB, SCL and SDA pins of the RX8025T chip are all connected with a system power supply VDD33 through a resistor R12.

4. The three-phase intelligent electric energy meter based on the AC-DC high-frequency conversion power supply of claim 1, wherein the storage module comprises a chip UC8, the chip UC8 is connected with the CPU through an SPI bus, the 15 th pin of UC8 is connected with the DF _ SI pin of the CPU, the 16 th pin of UC8 is connected with the DF _ SCK pin of the CPU, the 7 th pin of UC8 is connected with the DF _ CS pin of the CPU, the 8 th pin of UC8 is connected with the DF _ SO pin of the CPU, the 2 nd pin of UC8 is connected with power supply signals V _ LCD1& MEM, and the 10 th pin of UC8 is connected with the ground.

5. The three-phase intelligent electric energy meter based on the AC-DC high-frequency conversion power supply as claimed in claim 1, wherein the 485 module comprises a communication chip ISL3152, a VCC end of the 485 communication chip is connected with a V485 port, the VCC end of the 485 communication chip is further connected with a DGND through a capacitor C5, a resistor R35, a voltage stabilizing diode TVS1 and a resistor R34 are sequentially arranged between a GND end and a VCC end of the 485 communication chip, a pin 1 of the 485 communication chip is connected with a second control end of an optical coupler O6 through a parallel capacitor C20 and a resistor R32, pins 2 and 3 of the 485 communication chip are simultaneously connected with a second controlled end of an optical coupler O7, a pin 4 of the 485 communication chip is connected with a second controlled end of an optical coupler O7 through a resistor R33 and is simultaneously grounded, and a first control end of an optical coupler O6 is connected with a first controlled end of the optical coupler O7 through a resistor R31; the second controlled end of the optical coupler O6 is grounded, the first controlled end of the optical coupler O6 is connected with a system power supply VDD33 through a resistor R28 and is simultaneously connected with a 485_ RXD pin of the MCU main control module, the first control end of the optical coupler O7 is connected with a system power supply VDD33 through a resistor R29, the second control end of the optical coupler O7 is connected with a 485_ TXD pin of the MCU main control module through a resistor R30, and two ends of the resistor R30 are connected with a capacitor C19 in parallel.

6. The AC-DC high frequency conversion power supply-based three-phase intelligent electric energy meter according to claim 1, wherein the infrared module comprises an infrared receiving circuit and an infrared transmitting circuit, wherein

7. The AC-DC high frequency conversion power supply-based three-phase intelligent electric energy meter according to claim 1, wherein the display module comprises a liquid crystal display circuit and an indicator light indicating circuit;

8. The AC-DC high frequency conversion power supply based three-phase intelligent electric energy meter according to claim 1, the device is characterized in that a three-phase metering chip in the three-phase metering module adopts ADE7858, the ADE7858 and a 16.384 crystal oscillator form a minimum system, the three-phase metering module is in data communication with an MCU through SPI communication, a 37 th pin is connected with an ADE _ SO pin of the CPU, a 38 th pin is connected with an ADE _ SI pin of the CPU, a 36 th pin is connected with an ADE _ SCK pin of the CPU, a 39 th pin is connected with an ADE _ CS pin of the CPU, a 4 th pin is connected with an ADE _ R \ S \ T \ pin of the CPU, a 29 th pin is connected with an ADE _ I \ R \ Q \0\ pin of the CPU, a 32 th pin is connected with an ADE _ I \ R \ Q1 \ pin of the CPU, a 32 th pin is connected with an indicator light signal ADE _ CF1 of the display module, a 33 th pin is connected with an indicator light signal ADE _ CF1 of the display module, and a 34 th pin is connected with an indicator light signal ADE _ CF2 of the display module.

9. The AC-DC high-frequency conversion power supply-based three-phase intelligent electric energy meter as claimed in claim 1, wherein a chip UE1 in the ESMA module adopts an SGC1118B, a pin 1 of the UE1 is grounded, a pin 2 and a pin 7 are connected with an ESMA _ SDI pin of the CPU, a pin 3 and a pin 6 are connected with an ESAM _ SDO pin of the CPU, a pin 4 is connected with an EAAM _ C \ S \ pin of the CPU, a pin 5 is connected with an ESAM _ CLK pin of the CP, a pin 8 is connected with an ESMA power supply pin, a pin ESAM _ Pwr _ Ctrl of the MCU in the main control module is connected with a 2 nd pin of a triode QE1, and is connected with a VDD33 power supply through a resistor RE 1.

10. The three-phase intelligent electric energy meter based on the AC-DC high-frequency conversion power supply according to claim 1, wherein the main control module comprises an MCU chip HT6025, a peripheral crystal oscillator circuit and a power failure detection chip; the MCU chip carries out data communication with the real-time clock module through the IIC bus; carrying out data communication with the 485 communication circuit through a UART serial port; carrying out data communication with the HPLC module through a UART serial port;

the infrared module is connected with the UART serial port; carry out data communication through SPI bus and storage module, carry out data communication through liquid crystal driver chip control liquid crystal display module, carry out data communication through UART serial ports and smart card module, carry out data communication through SPI bus and ESMA module.