CN209803234U - Single-phase voltage digital display instrument - Google Patents
Single-phase voltage digital display instrument Download PDFInfo
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- CN209803234U CN209803234U CN201920508624.2U CN201920508624U CN209803234U CN 209803234 U CN209803234 U CN 209803234U CN 201920508624 U CN201920508624 U CN 201920508624U CN 209803234 U CN209803234 U CN 209803234U
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Abstract
The utility model relates to a single-phase voltage digital display instrument, including MCU, voltage sampling circuit, keying circuit, power supply circuit, pilot lamp display circuit, charactron display circuit, data storage circuit, RS485 communication circuit, MCU's input is connected respectively to keying circuit's output and voltage sampling circuit's output, MCU's input, charactron display circuit's input, data storage circuit's input are connected respectively to MCU's output, MCU and RS485 communication circuit are connected, power supply circuit provides operating voltage for MCU, voltage sampling circuit, keying circuit, pilot lamp display circuit, charactron display circuit, data storage circuit, RS485 communication circuit respectively. The utility model discloses a single-phase voltage digital display instrument has significantly reduced voltage sampling circuit's components and parts and cost, and circuit integration is higher, can realize the remote communication of single-phase voltage digital display instrument and next machine, and the instrument self can save voltage measurement data simultaneously.
Description
Technical Field
the utility model relates to an electric power instrument especially relates to a single-phase voltage digital display instrument.
Background
With the development of social economy and the progress of science and technology, the power industry is rapidly developed. In order to better implement the smart grid and realize the automation of the power industry, the state puts forward higher requirements on the power industry, relates to the aspects of strengthening the supervision of the power market, the power safety production management, improving the power quality and the like, realizes the comprehensive monitoring of the power grid, and must invest a large number of digital display instruments. The voltage sampling of the single-phase voltage digital display instrument on the market at present generally inputs the CPU to measure after the step-down rectification of the sampling circuit and the analog-to-digital conversion of the ADC sampling chip, and such single-phase voltage digital display instrument sampling circuit is too complicated and the power consumption of the instrument is high, does not have a communication interface, can't carry out remote communication with the voltage parameter that obtains of measurement, also can't preserve voltage data for a long time.
Disclosure of Invention
In view of this, the utility model aims at providing a voltage sampling circuit is simple, the integrated level is high, can realize remote communication and data long-term storage's single-phase voltage digital display instrument.
In order to realize the above purpose, the utility model adopts such a single-phase voltage digital display instrument, which comprises an MCU, a voltage sampling circuit, a key circuit, a power circuit, an indicator light display circuit, a nixie tube display circuit, a data storage circuit and an RS485 communication circuit, wherein the output end of the key circuit and the output end of the voltage sampling circuit are respectively connected with the input end of the MCU, the output end of the MCU is respectively connected with the input end of the indicator light display circuit, the input end of the nixie tube display circuit and the input end of the data storage circuit, the MCU is connected with the RS485 communication circuit, the power circuit respectively provides working voltage for the MCU, the voltage sampling circuit, the key circuit, the indicator light display circuit, the nixie tube display circuit, the data storage circuit and the RS485 communication circuit,
The voltage sampling circuit comprises resistors R1-R8, capacitors C1-C3, a transient voltage suppression diode D1 and an operational amplifier U1A, wherein the resistor R3, the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, one end of the resistor R1 and one end of the resistor R3 are respectively connected with external single-phase alternating current, the other end of the resistor R1 are respectively connected with one end of a resistor R2 and the non-inverting input end of the operational amplifier U1A, the other end of the resistor R2 is respectively connected with one end of a capacitor C2, one end of the transient voltage suppression diode D2 and high level, the other end of the capacitor C2 and the other end of the transient voltage suppression diode D2 are both grounded, the capacitor C2 is connected in parallel with the two ends of the transient voltage suppression diode D2, one end of the resistor R2 is respectively connected with the inverting input end of the operational amplifier U1 2 and one end of the resistor R2, the output end of the operational amplifier U1 2 is respectively connected with the other, the other end of the resistor R8 is connected with one end of the capacitor C3, the other end of the capacitor C3 is grounded in an analog mode, and the other end of the capacitor R8 outputs a voltage sampling signal to the input end of the MCU.
The voltage sampling circuit of the single-phase voltage digital display instrument directly reduces the voltage of single-phase alternating current through the resistor, the single-phase alternating current is input to the input end of the operational amplifier U1A for operational amplifier, voltage sampling signals obtained by operational amplifier are input to the MCU for metering, the MCU can directly obtain real-time data of voltage through an algorithm, a rectifying part, a filtering part and an ADC (analog to digital converter) sampling chip required by the existing voltage sampling circuit are omitted, components and parts and cost of the voltage sampling circuit are greatly reduced, a capacitor C1, a capacitor C2 and a transient voltage suppression diode D1 form overvoltage protection of the voltage input side. The utility model discloses a single-phase voltage digital display instrument circuit integrated level is high, and is equipped with RS485 communication circuit and data storage circuit, can realize the remote communication of single-phase voltage digital display instrument and next machine, and the instrument self can save voltage measurement data simultaneously.
The utility model discloses it is further set up as data storage circuit includes memory chip U5, resistance R9, resistance R10, electric capacity C4, electric capacity C5, memory chip U5's A0 pin, A1 pin, A2 pin, GND pin all ground, memory chip U5's SDA pin connecting resistance R10's one end, memory chip U5's SCL pin connecting resistance R9's one end, the other end of resistance R9, the other end of resistance R10, memory chip U5's VDD pin all connects the high level, electric capacity C4's one end connects the high level, electric capacity C4's other end ground connection, electric capacity C5 connects in parallel at electric capacity C4's both ends, memory chip U5's SDA pin, SCL pin, WP pin are connected to MCU's output respectively.
The utility model further provides that the model of memory chip U5 is 24C 04.
The data storage circuit is mainly based on a memory chip with the model number of 24C04, has few peripheral components, supports the transmission of bidirectional two-wire bus data, has the advantages of low power consumption and long data storage time, and can retain the voltage data of a user for a long time.
What this practicality further set up to MCU adoption is HR8P506 series singlechip.
The MCU of the HR8P506 type has high integration level, 12-bit ADC sampling precision and 46I/O ports, and has enough ports for the output and input of nixie tubes, indicator lamps and keys, so that the requirement of a single-phase voltage digital display instrument is met, and two-way two-wire bus communication is supported.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a data storage circuit according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the MCU circuit according to the embodiment of the present invention.
Detailed Description
As shown in figures 1-4, the utility model relates to a single-phase voltage digital display instrument, which comprises an MCU, a voltage sampling circuit, a key circuit, a power circuit, an indicator light display circuit, a nixie tube display circuit, a data storage circuit and an RS485 communication circuit, wherein the MCU adopts an HR8P506 series single chip microcomputer, the output end of the key circuit and the output end of the voltage sampling circuit are respectively connected with the input end of the MCU, the output end of the MCU is respectively connected with the input end of the indicator light display circuit, the input end of the nixie tube display circuit and the input end of the data storage circuit, the MCU is connected with the RS485 communication circuit, the power circuit respectively provides working voltage for the MCU, the voltage sampling circuit, the key circuit, the indicator light display circuit, the nixie tube display circuit, the data storage circuit and the RS485 communication circuit,
The voltage sampling circuit comprises resistors R1-R8, capacitors C1-C3, a transient voltage suppression diode D1 and an operational amplifier U1A, wherein the resistor R3, the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, one end of the resistor R1 and one end of the resistor R3 are respectively connected with external single-phase alternating current, the other end of the resistor R1 are respectively connected with one end of a resistor R2 and the non-inverting input end of the operational amplifier U1A, the other end of the resistor R2 is respectively connected with one end of a capacitor C2, one end of the transient voltage suppression diode D2 and high level, the other end of the capacitor C2 and the other end of the transient voltage suppression diode D2 are both grounded, the capacitor C2 is connected in parallel with the two ends of the transient voltage suppression diode D2, one end of the resistor R2 is respectively connected with the inverting input end of the operational amplifier U1 2 and one end of the resistor R2, the output end of the operational amplifier U1 2 is respectively connected with the other, the other end of the resistor R8 is connected with one end of the capacitor C3, the other end of the capacitor C3 is grounded in an analog mode, and the other end of the capacitor R8 outputs a voltage sampling signal to the input end of the MCU
The data storage circuit comprises a memory chip U5, a resistor R9, a resistor R10, a capacitor C4 and a capacitor C5, wherein the model of the memory chip U5 is 24C04, the pin A0, the pin A1, the pin A2 and the pin GND of the memory chip U5 are all grounded, the pin SDA of the memory chip U5 is connected with one end of the resistor R10, the pin SCL of the memory chip U5 is connected with one end of the resistor R9, the other ends of the resistor R9, the resistor R10 and the pin VDD of the memory chip U5 are all connected with high level, one end of the capacitor C4 is connected with high level, the other end of the capacitor C4 is grounded, the capacitor C5 is connected in parallel to two ends of the capacitor C4, and the pin SDA, the pin SCL and the pin WP of the memory chip U5 are respectively connected to the output end of.
Claims (4)
1. A single-phase voltage digital display instrument is characterized in that: the device comprises an MCU, a voltage sampling circuit, a key circuit, a power supply circuit, an indicator light display circuit, a nixie tube display circuit, a data storage circuit and an RS485 communication circuit, wherein the output end of the key circuit and the output end of the voltage sampling circuit are respectively connected with the input end of the MCU, the output end of the MCU is respectively connected with the input end of the indicator light display circuit, the input end of the nixie tube display circuit and the input end of the data storage circuit, the MCU is connected with the RS485 communication circuit, the power supply circuit respectively provides working voltage for the MCU, the voltage sampling circuit, the key circuit, the indicator light display circuit, the nixie tube display circuit, the data storage circuit and the RS485 communication circuit,
The voltage sampling circuit comprises resistors R1-R8, capacitors C1-C3, a transient voltage suppression diode D1 and an operational amplifier U1A, wherein the resistor R3, the resistor R4, the resistor R5 and the resistor R6 are sequentially connected in series, one end of the resistor R1 and one end of the resistor R3 are respectively connected with external single-phase alternating current, the other end of the resistor R1 are respectively connected with one end of a resistor R2 and the non-inverting input end of the operational amplifier U1A, the other end of the resistor R2 is respectively connected with one end of a capacitor C2, one end of the transient voltage suppression diode D2 and high level, the other end of the capacitor C2 and the other end of the transient voltage suppression diode D2 are both grounded, the capacitor C2 is connected in parallel with the two ends of the transient voltage suppression diode D2, one end of the resistor R2 is respectively connected with the inverting input end of the operational amplifier U1 2 and one end of the resistor R2, the output end of the operational amplifier U1 2 is respectively connected with the other, the other end of the resistor R8 is connected with one end of the capacitor C3, the other end of the capacitor C3 is grounded in an analog mode, and the other end of the capacitor R8 outputs a voltage sampling signal to the input end of the MCU.
2. The single-phase digital voltage display instrument according to claim 1, wherein: the data storage circuit comprises a memory chip U5, a resistor R9, a resistor R10, a capacitor C4 and a capacitor C5, wherein a0 pin, a1 pin, a2 pin and a GND pin of the memory chip U5 are all grounded, an SDA pin of the memory chip U5 is connected with one end of the resistor R10, an SCL pin of the memory chip U5 is connected with one end of the resistor R9, the other end of the resistor R9, the other end of the resistor R10 and a VDD pin of the memory chip U5 are all connected with a high level, one end of the capacitor C4 is connected with the high level, the other end of the capacitor C4 is grounded, the capacitor C5 is connected in parallel with two ends of a capacitor C4, and the SDA pin, the SCL pin and the WP pin of the memory chip U5 are respectively connected with an output end of.
3. the single-phase digital voltage display instrument according to claim 1 or 2, characterized in that: the MCU adopts an HR8P506 series single chip microcomputer.
4. The single-phase digital voltage display instrument according to claim 2, wherein: the model number of the memory chip U5 is 24C 04.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508624.2U CN209803234U (en) | 2019-04-15 | 2019-04-15 | Single-phase voltage digital display instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920508624.2U CN209803234U (en) | 2019-04-15 | 2019-04-15 | Single-phase voltage digital display instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209803234U true CN209803234U (en) | 2019-12-17 |
Family
ID=68829496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920508624.2U Expired - Fee Related CN209803234U (en) | 2019-04-15 | 2019-04-15 | Single-phase voltage digital display instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209803234U (en) |
-
2019
- 2019-04-15 CN CN201920508624.2U patent/CN209803234U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191217 |