CN207263827U

CN207263827U - A kind of guide rail type electrical energy meter circuit

Info

Publication number: CN207263827U
Application number: CN201721110771.1U
Authority: CN
Inventors: 刘平; 张健
Original assignee: YUEQING RENHE ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: YUEQING RENHE ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2017-08-26
Filing date: 2017-08-26
Publication date: 2018-04-20
Anticipated expiration: 2027-08-26

Abstract

It the utility model is related to a kind of guide rail type electrical energy meter circuit, including current sampling unit, voltage sampling unit, electrical energy pulse unit, electrical energy measurement IC units, CPU, LCD display unit, RS485 communication units, memory cell, push-button unit and power supply, wherein electrical energy measurement IC units include current input circuit, voltage input circuit, reference voltage-regulating circuit, impulse output circuit and integrated circuit U 2, the output terminal of the current input circuit and voltage input circuit connects the input terminal of integrated circuit U2 respectively, reference voltage-regulating circuit is connected with integrated circuit U2, the input terminal of the output terminal connection impulse output circuit of integrated circuit U2, the electrical energy measurement precision of electric energy meter is high, connection is simple, circuit stability is good.

Description

A kind of guide rail type electrical energy meter circuit

Technical field

It the utility model is related to a kind of circuit, more particularly to a kind of guide rail type electrical energy meter circuit.

Background technology

With the development of economic society and the increase of electricity needs, contacting between power consumer and electric power networks is more next Closer, electric energy meter has electrical energy measurement, information storage, information exchange, automatic control as both electric energy measurement instruments of contact The effect such as system, therefore the measuring accuracy of electric energy meter and circuit function are particularly important, and a kind of present two line of Domestic single-phase Although electric energy meter can achieve the purpose that measuring power, its precision is not high enough, and circuit structure is complicated, and connection is not steady enough It is fixed.

The content of the invention

In view of this, lead the purpose of this utility model is to provide a kind of precision is high, connection is simple, circuit stability is good Rail electric energy meter circuit.

In order to realize the above object the utility model uses such a guide rail type electrical energy meter circuit, including current sampling Unit, voltage sampling unit, electrical energy pulse unit, electrical energy measurement IC units, CPU, LCD display unit, RS485 communication units, Memory cell, push-button unit and power supply, wherein current sampling unit, the output terminal of voltage sampling unit connect electric energy meter respectively The input terminal of IC units is measured, the output terminal of electrical energy measurement IC units connects electrical energy pulse unit and the input terminal of CPU, CPU respectively Output terminal connect LCD display unit, RS485 communication units, the input terminal of memory cell, the output of push-button unit respectively The input terminal of end connection CPU, the output terminal of power supply connect the input terminal of CPU and electrical energy measurement IC units, the electric energy meter respectively Amount IC units include current input circuit, voltage input circuit, reference voltage-regulating circuit, impulse output circuit and integrated circuit U2, the output terminal of the current input circuit and voltage input circuit connect the input terminal of integrated circuit U2, reference voltage respectively Adjustment circuit is connected with integrated circuit U2, the input terminal of the output terminal connection impulse output circuit of integrated circuit U2, wherein,

The current input circuit includes resistance R11, R12, and capacitance C7, C8, described resistance R11 one end connects current sampling The output terminal of unit, 4 pins of resistance R11 other ends connection integrated circuit U2, the one of R12 one end connection current sampling unit End, 5 pins of resistance R12 other ends connection integrated circuit U2, capacitance C7 and C8 are connected in series in the 4 of integrated circuit U2,5 and draw Between foot, capacitance C7 and C8 connecting pin analogue grounds；

The voltage input circuit includes resistance R4, R6, R7, and capacitance C1, C2, the capacitance C2 and resistance R7 are in parallel, electricity Hold 3 pins of C2 one end connection integrated circuit U2, the other end analogue ground of capacitance C2, capacitance C1 and resistance R6 are in parallel, capacitance 2 pins of C1 one end connection integrated circuit U2, the other end analogue ground of capacitance C1, resistance R4 one end connection integrated circuit U2's 2 pins, the output terminal of another termination voltage sampling unit of resistance R4；

The reference voltage-regulating circuit includes capacitance C3 and electrolytic capacitor C9, and the capacitance C3 and electrolytic capacitor C9 are simultaneously Connection, 7 pins of the cathode connection integrated circuit U2 of electrolytic capacitor C9, the anode analogue ground of electrolytic capacitor C9；

The impulse output circuit includes resistance R19, opto-coupler chip U1, U4, wire connection terminal P3, described resistance R19 one end Connect 14 pins of integrated circuit U2, the cathode of resistance R19 other ends connection opto-coupler chip U4, the anode connection of opto-coupler chip U4 The cathode of opto-coupler chip U1, the collector and emitter of opto-coupler chip U4 are connected to wire connection terminal P3 both ends, and wire connection terminal P3 connects Connect electrical energy pulse unit, the anode analogue ground of opto-coupler chip U1, the emitter ground connection of opto-coupler chip U1, the collection of opto-coupler chip U1 Electrode connects the input terminal of CPU.

This practicality is further arranged to integrated circuit U2 models BL0930.

This practicality is further arranged to the model PC816 of opto-coupler chip U1, U4.

Above-mentioned electrical energy measurement IC units use computation chip BL0930, computation chip BL0930 to employ over-sampling, number Word signal processing technology, substantially increases the accuracy of chip measurement, it is contemplated that takes into account electric energy meter shunt running and startability will Ask different, designed using rational anti-shunt running threshold values, on the premise of ensureing reliably to prevent shunt running, be far below starting current Standard requirement, and computing and processing are carried out by digital circuit in the transformed data of A/D, it ensure that computation chip is steady for a long time Fixed operation, the peripheral circuit based on computation chip BL0930 are simple.

Brief description of the drawings

Fig. 1 is the utility model embodiment circuit block diagram.

Fig. 2 is the utility model embodiment electrical energy measurement IC element circuit schematic diagrams.

Embodiment

As illustrated in fig. 1 and 2, the utility model is a kind of guide rail type electrical energy meter circuit, including current sampling unit, voltage take Sample unit, electrical energy pulse unit, electrical energy measurement IC units, CPU, LCD display unit, RS485 communication units, memory cell, Push-button unit and power supply, wherein current sampling unit, the output terminal of voltage sampling unit connect electrical energy measurement IC units respectively Input terminal, the output terminal of electrical energy measurement IC units connect electrical energy pulse unit and the input terminal of CPU, the output terminal point of CPU respectively Not Lian Jie LCD display unit, RS485 communication units, the input terminal of memory cell, the output terminal connection CPU of push-button unit Input terminal, the output terminal of power supply connect the input terminal of CPU and electrical energy measurement IC units respectively, and the electrical energy measurement IC units include Current input circuit, voltage input circuit, reference voltage-regulating circuit, impulse output circuit and integrated circuit U 2, the electric current The output terminal of input circuit and voltage input circuit connects the input terminal of integrated circuit U2, reference voltage-regulating circuit and collection respectively Connected into circuit U 2, the input terminal of the output terminal connection impulse output circuit of integrated circuit U2, integrated circuit U2's uses metering Chip BL0930, wherein,

Current input circuit includes resistance R11, R12, and capacitance C7, C8, described resistance R11 one end connects current sampling list The output terminal of member, 4 pins of resistance R11 other ends connection integrated circuit U2, R12 one end connect one end of current sampling unit, 5 pins of resistance R12 other ends connection integrated circuit U2, capacitance C7 and C8 be connected in series in the 4 of integrated circuit U2,5 pins it Between, capacitance C7 and C8 connecting pin analogue grounds；

Voltage input circuit includes resistance R4, R6, R7, and capacitance C1, C2, the capacitance C2 and resistance R7 are in parallel, capacitance C2 3 pins of one end connection integrated circuit U2, the other end analogue ground of capacitance C2, capacitance C1 and resistance R6 are in parallel, capacitance C1 mono- 2 pins of end connection integrated circuit U2, the other end analogue ground of capacitance C1, the 2 of resistance R4 one end connection integrated circuit U2 draws Foot, the output terminal of another termination voltage sampling unit of resistance R4；

Reference voltage-regulating circuit includes capacitance C3 and electrolytic capacitor C9, and the capacitance C3 and electrolytic capacitor C9 are in parallel, electricity Solve 7 pins of the cathode connection integrated circuit U2 of capacitance C9, the anode analogue ground of electrolytic capacitor C9；

Impulse output circuit includes resistance R19, opto-coupler chip U1, U4, wire connection terminal P3, opto-coupler chip U1, U4 model PC816,14 pins of resistance R19 one end connection integrated circuit U2, resistance R19 other ends connection opto-coupler chip U4 is just Pole, the cathode of the anode connection opto-coupler chip U1 of opto-coupler chip U4, the collector and emitter of opto-coupler chip U4 are connected to wiring 3 both ends of terminals P, wire connection terminal P3 connection electrical energy pulse units, the anode analogue ground of opto-coupler chip U1, opto-coupler chip U1's Emitter is grounded, the input terminal of the collector connection CPU of opto-coupler chip U1.

According to above example, current sampling unit, voltage sampling unit are respectively by current sampling unit, voltage sampling Unit is input to the corresponding passages of electric energy computation chip BL0930, obtains the product of electric current, voltage, i.e. active power, passes through meter After measuring chip BL0930 processing, frequency signal is converted to, output frequency signal is transported to CPU and wire connection terminal through opto-coupler chip, Isolation input side signal and outlet side signal, make circuit have good antijamming capability, and CPU adds up pulse number, And the accurate measurement to electric energy is realized according to meter constant size, it is stored in after computing in non-volatile EEPROM, reaches accurate Metering, anti-interference, stable operation purpose.

Claims

1. a kind of guide rail type electrical energy meter circuit, including current sampling unit, voltage sampling unit, electrical energy pulse unit, electric energy meter Measure IC units, CPU, LCD display unit, RS485 communication units, memory cell, push-button unit and power supply, wherein current sampling Unit, the output terminal of voltage sampling unit connect the input terminal of electrical energy measurement IC units, the output of electrical energy measurement IC units respectively End connects electrical energy pulse unit and the input terminal of CPU respectively, and the output terminal of CPU connects LCD display unit, RS485 communications respectively The input terminal of unit, memory cell, the input terminal of the output terminal connection CPU of push-button unit, the output terminal of power supply connect respectively The input terminal of CPU and electrical energy measurement IC units, it is characterised in that：The electrical energy measurement IC units include current input circuit, electricity Press input circuit, reference voltage-regulating circuit, impulse output circuit and integrated circuit U 2, the current input circuit and voltage defeated The output terminal for entering circuit connects the input terminal of integrated circuit U2 respectively, and reference voltage-regulating circuit is connected with integrated circuit U2, collection Output terminal into circuit U 2 connects the input terminal of impulse output circuit,

The current input circuit includes resistance R11, R12, and capacitance C7, C8, described resistance R11 one end connects current sampling unit Output terminal, 4 pins of resistance R11 other ends connection integrated circuit U2, R12 one end connects one end of current sampling unit, electricity 5 pins of R12 other ends connection integrated circuit U2 are hindered, capacitance C7 and C8 are connected in series between the 4 of integrated circuit U2,5 pins, Capacitance C7 and C8 connecting pin analogue grounds；

The voltage input circuit includes resistance R4, R6, R7, and capacitance C1, C2, the capacitance C2 and resistance R7 are in parallel, capacitance C2 3 pins of one end connection integrated circuit U2, the other end analogue ground of capacitance C2, capacitance C1 and resistance R6 are in parallel, capacitance C1 mono- 2 pins of end connection integrated circuit U2, the other end analogue ground of capacitance C1, the 2 of resistance R4 one end connection integrated circuit U2 draws Foot, the output terminal of another termination voltage sampling unit of resistance R4；

The reference voltage-regulating circuit includes capacitance C3 and electrolytic capacitor C9, and the capacitance C3 and electrolytic capacitor C9 are in parallel, electricity Solve 7 pins of the cathode connection integrated circuit U2 of capacitance C9, the anode analogue ground of electrolytic capacitor C9；

The impulse output circuit includes resistance R19, opto-coupler chip U1, U4, wire connection terminal P3, resistance R19 one end connection 14 pins of integrated circuit U2, the cathode of resistance R19 other ends connection opto-coupler chip U4, the anode connection optocoupler of opto-coupler chip U4 The cathode of chip U1, the collector and emitter of opto-coupler chip U4 are connected to wire connection terminal P3 both ends, wire connection terminal P3 connections electricity Energy impulse unit, the anode analogue ground of opto-coupler chip U1, the emitter ground connection of opto-coupler chip U1, the collector of opto-coupler chip U1 Connect the input terminal of CPU.

2. guide rail type electrical energy meter circuit according to claim 1, it is characterised in that：The integrated circuit U2 models BL0930。

3. guide rail type electrical energy meter circuit according to claim 1 or 2, it is characterised in that：The type of described opto-coupler chip U1, U4 Number it is PC816.