CN104914301A - Digital power meter - Google Patents
Digital power meter Download PDFInfo
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- CN104914301A CN104914301A CN201510358244.1A CN201510358244A CN104914301A CN 104914301 A CN104914301 A CN 104914301A CN 201510358244 A CN201510358244 A CN 201510358244A CN 104914301 A CN104914301 A CN 104914301A
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Abstract
The invention provides a digital power meter which is formed by a power sampling circuit, a power metering circuit, a single chip microcomputer circuit, an LED display circuit and a power supply circuit, and the connection relationship is shown in the drawing. Resistance sampling is used by power sampling, an HLW8012 single phase electric energy metering meter is used to measure the active power consumed by an electrical appliance, an AT89C2051 single chip microcomputer is applied to carry out data processing and display driving, a four-bit eight-section LED digital tube is used to display a measurement value, and a non-isolated +5V power supply is used for power supplying. The maximum measurement power of the digital meter is 4400W and can be accurate to 0.1W. The L and N ends of the digital meter are connected to AC mains supply, the power input end of the electrical appliance powered by the AC mains supply is connected to the two wiring ends J1 and J2 of the digital meter, and the active power consumed by the electrical appliance can be measured. The digital power meter has the advantages of simple circuit, small size, light weight, low cost, low power consumption, high precision, low price, simple operation and easy use.
Description
Technical field
The present invention relates to electronic measuring instrument technical field, be specifically related to a kind of digital power meter.
Background technology
Electrical power P is measured in laboratory, be generally the voltage U measuring electrical appliance two ends with voltage table, measure the electric current I in electrical appliance with reometer, then calculate the power of electrical appliance consumption according to P=UI, not only measuring process is complicated, but also will by calculating the power that just can obtain electrical appliance and consume.Wattmeter complex structure, sensitivity is low, and volume is large, and price is high.Improving constantly simultaneously along with economic development and people's living standard, household electrical appliance get more and more, and the power consumption of many families to household electrical appliance is attached great importance to, and need the power meter of a kind of energy simple and quick measurement electrical appliance consumed power.
Summary of the invention
For solving the deficiency of existing power meter, the present invention discloses a kind of digital power meter.The power samples of this digital power meter adopts resistance sampling, HLW8012 single-phase electric energy computation chip is utilized to measure the active power of electrical appliance consumption, application AT89C2051 single-chip microcomputer carries out data processing and display driver, adopt four eight sections LED numeral method measured values, use non-isolated+5V Power supply, the maximum measurement power of power meter is 4400W, can be accurate to 0.1W.By L, N two termination electric main of digital watch, the power input of the electrical appliance using electric main to power, is connected on J1, J2 two terminals of digital power meter, can measures the active power that electrical appliance consumes.
For achieving the above object, the present invention adopts following technical scheme: a kind of digital power meter, is made up of power samples circuit, power measurement circuit, single chip circuit, LED display circuit and power circuit.Power samples electricity routing resistance R1 ~ R8 and electric capacity C1, C2, C3 composition.Power measurement circuit is made up of integrated circuit (IC) chip HLW8012 and electric capacity C4.Single chip circuit is by AT89C2051 single-chip microcomputer, and resistance R9, electric capacity C5 ~ C8 and crystal oscillator X1 form.LED display circuit is made up of four eight sections of LED charactron DPY1 and exclusion R10.Power circuit is by integrated circuit (IC) chip 78L05, and resistance R11, R12, electric capacity C9 ~ C12, diode D1, D2 and voltage stabilizing diode DZ1 form.
Good effect of the present invention is: circuit is simple, volume is little, lightweight, and cost is low, power consumption is little, precision is high, low price, simple to operate, easy to use.
Accompanying drawing explanation
Fig. 1 is block diagram of the present invention.
Fig. 2 is power samples circuit of the present invention.
Fig. 3 is power measurement circuit of the present invention.
Fig. 4 is single chip circuit of the present invention.
Fig. 5 is LED display circuit of the present invention.
Fig. 6 is power circuit of the present invention.
Embodiment
As shown in Figure 1, the present invention is made up of power samples circuit, power measurement circuit, single chip circuit, LED display circuit and power circuit.The input termination electric main of power samples circuit, exports the input end of termination power measurement circuit; The output terminal of the input termination power measurement circuit of single chip circuit, exports termination LED display circuit input end; The input termination electric main of power circuit, exports the power end of termination power measurement circuit, single chip circuit and LED display circuit.
As shown in Figure 2, power samples electricity routing resistance R1 ~ R8 and electric capacity C1, C2, C3 composition.The tie point of resistance R1 and R2 one end meets terminals J2, and J2 connects one end of electrical appliance, another termination terminals J1 of electrical appliance, and J1 connects the live wire of electric main; The tie point ground connection of R3 one end and the R1 other end, and connect the zero line of electric main; The other end of R2 and one end of C1 are connected to the output terminal V1P of current sample, are connected with the 2 pin V1P of the THLW8012 of power measurement circuit; The other end of R3 and one end of C2 are connected to the output terminal V1N of current sample, are connected with the 3 pin V1N of THLW8012; The other end of C1 and C2 is connected and ground connection.R4, R5, R6, R7 connect, the live wire of another termination electric main of R4, one end ground connection of R8 and C3 parallel connection, and the other end in parallel and the other end of R7 are connected to the output terminal V2P of voltage sample, meet the 4 pin voltage sample input end V2P of THLW8012.
Power samples can be divided into electric current and voltage sample, and the sampling of electric current, voltage has resistance sampling and mutual inductor sample two kinds of modes, and mutual inductor sample mode volume is large, cost is high, and electric current of the present invention and voltage sample all adopt resistance sampling mode.The current flowing resistance R1 of electrical appliance, through R2, C1 and R3, C2 capacitance-resistance filter, converts current signal to voltage signal.Current sampling resistor R1 is designed to the copper-manganese resistance of 0.001 Ω/2W, and maximum sample rate current is 20A.Voltage sample utilizes the sampling of resistance R4 ~ R8 series connection dividing potential drop, and the voltage divided by R8 obtains sampled voltage through C3 filtering.The resistance value of resistance R4 ~ R7 is all designed to 470K Ω, and the resistance value of R8 is 1K Ω, is practically applicable to the voltage sample to 220V electric main.
As shown in Figure 3, power measurement circuit is made up of integrated circuit (IC) chip HLW8012 and electric capacity C4.1 pin of THLW8012 connects one end of+5V power supply and C4, the other end ground connection of C4; 2 pin meet the output terminal V1P of power samples circuit; 3 pin meet the output terminal V1N of power samples circuit; 4 pin meet the output terminal V2P of power samples circuit; 5 pin ground connection; 6 pin connect 6 pin of the AT89C2051 of single chip circuit, and 7,8 pin are unsettled need not.
HLW8012 is the single-phase electric energy computation chip that Shenzhen makes a concerted effort for scientific & technical corporation designs, and can measure the effective value of active power, electric current and voltage.Adopt CMOS technology, SOP8 encapsulates, and built-in crystal oscillator, 2.43V voltage reference source and power supply supervisory circuit ,+5V single power supply, power consumption during work is not more than 15mW.The square wave of the high-frequency impulse CF exported to be dutycycle be 1:1, by measuring the frequency computation part active power of the high-frequency impulse that CF pin exports, precision is ± 0.3%.
As shown in Figure 4, single chip circuit is by AT89C2051 single-chip microcomputer, and resistance R9, electric capacity C5 ~ C8 and crystal oscillator X1 form.1 pin of AT89C2051 connects the tie point of R9 one end and C6 negative pole, 2, 3, 7, 8 pin connect 6 of the DPYI of LED display circuit respectively, 8, 9, 12 pin, 4 pin connect the tie point of crystal oscillator X1 one end and electric capacity C8 one end, 5 pin connect the tie point of the crystal oscillator X1 other end and electric capacity C7 one end, 6 pin connect 6 pin of HLW8012, 9, 11 pin are unsettled need not, 10 pin and R9, C5, C7, the other end all ground connection of C8, 12 ~ 19 pin connect 11 of DPYI respectively, 7, 4, 2, 1, 10, 5, 3 pin, 12 ~ 19 pin also connect 2 ~ 9 pin of the exclusion R10 of LED display circuit respectively, 20 pin, the positive pole of C6 and C5 one end all connect+5V power supply.
AT89C2051 is high-performance, low voltage cmos 8 single-chip microcomputers that atmel corp produces.1 pin of AT89C2051 is reset terminal, and R9, C6 form the reset circuit of single-chip microcomputer.4 pin of AT89C2051,5 pin internal circuits and external crystal-controlled oscillation X1 and electric capacity C7, C8 form clock oscillation circuit.AT89C2051 calculates active power by the frequency of the high-frequency impulse that the CF pin measuring electric energy computation chip HLW8012 exports, and drives DPY1 display measurement value.
As shown in Figure 5, LED display circuit is made up of four eight sections of LED charactron DPY1 and exclusion R10.1 pin of exclusion R10 connects+5V power supply, and 2 ~ 9 pin connect 12 ~ 19 pin of AT89C2051 single-chip microcomputer respectively; 11,7,4,2,1,10,5,3 pin of DPY1 connect 12 ~ 19 pin of AT89C2051 single-chip microcomputer respectively, and 6,8,9,12 pin connect 2,3,7,8 pin of AT89C2051 single-chip microcomputer respectively.
As shown in Figure 6, power circuit is by integrated circuit (IC) chip 78L05, and resistance R11, R12, electric capacity C9 ~ C12, diode D1, D2 and voltage stabilizing diode DZ1 form.The live wire of one termination electric main of C9 and R11 parallel connection, one end of another termination R12, another termination D1 negative pole of R12 and the tie point of D2 positive pole, the negative pole of D2, the negative pole of DZ1, the positive pole of C10, one end of C11 are connected with 1 pin of 78L05,3 pin of 78L05 are connected with the positive pole of C12 for the output terminal of+5V power supply, 2 pin of the negative pole of the positive pole of D1, the positive pole of DZ1, C10, the other end of C11,78L05 and negative pole all ground connection of C12, and connect the zero line of electric main.In order to coordinate the resistance non-isolated sample mode of electric current, voltage, the present invention samples the non-isolated power supply of resistance-capacitance depressurization type.
The digital power meter of the present invention's design, operating voltage is the electric main of 220V, and self power consumption is less than 1W, and maximum measurement power is 4400W, can be accurate to 0.1W, measuring error is less than ± and 0.3%.Circuit is simple, volume is little, lightweight, cost is low, power consumption is little, precision is high, low price, simple to operate, easy to use, has wide market outlook.
Claims (5)
1. a digital power meter, is characterized in that: a kind of digital power meter, is made up of power samples circuit, power measurement circuit, single chip circuit, LED display circuit and power circuit; Power samples electricity routing resistance R1 ~ R8 and electric capacity C1, C2, C3 composition; Power measurement circuit is made up of integrated circuit (IC) chip HLW8012 and electric capacity C4; Single chip circuit is by AT89C2051 single-chip microcomputer, and resistance R9, electric capacity C5 ~ C8 and crystal oscillator X1 form; LED display circuit is made up of four eight sections of LED charactron DPY1 and exclusion R10; Power circuit is by integrated circuit (IC) chip 78L05, and resistance R11, R12, electric capacity C9 ~ C12, diode D1, D2 and voltage stabilizing diode DZ1 form.
2. a kind of digital power meter according to claim 1, is characterized in that: the resistance R1 of power samples circuit and the tie point of R2 one end meet terminals J2, and J2 connects one end of electrical appliance, another termination terminals J1 of electrical appliance, and J1 connects the live wire of electric main; The tie point ground connection of R3 one end and the R1 other end, and connect the zero line of electric main; The other end of R2 and one end of C1 are connected to the output terminal V1P of current sample, are connected with the 2 pin V1P of the THLW8012 of power measurement circuit; The other end of R3 and one end of C2 are connected to the output terminal V1N of current sample, are connected with the 3 pin V1N of THLW8012; The other end of C1 and C2 is connected and ground connection; R4, R5, R6, R7 connect, the live wire of another termination electric main of R4, one end ground connection of R8 and C3 parallel connection, and the other end in parallel and the other end of R7 are connected to the output terminal V2P of voltage sample, meet the 4 pin voltage sample input end V2P of THLW8012; Current sampling resistor R1 is designed to the copper-manganese resistance of 0.001 Ω/2W, and maximum sample rate current is 20A; Voltage sample utilizes the sampling of resistance R4 ~ R8 series connection dividing potential drop, and the resistance value of resistance R4 ~ R7 is all designed to 470K Ω, and the resistance value of R8 is 1K Ω, is practically applicable to the voltage sample to 220V electric main.
3. a kind of digital power meter according to claim 1, is characterized in that: 1 pin of the THLW8012 of power measurement circuit connects one end of+5V power supply and C4, the other end ground connection of C4; 2 pin meet the output terminal V1P of power samples circuit; 3 pin meet the output terminal V1N of power samples circuit; 4 pin meet the output terminal V2P of power samples circuit; 5 pin ground connection; 6 pin connect 6 pin of the AT89C2051 of single chip circuit, and 7,8 pin are unsettled need not.
4. a kind of digital power meter according to claim 1, it is characterized in that: 1 pin of the AT89C2051 of single chip circuit connects the tie point of R9 one end and C6 negative pole, 2, 3, 7, 8 pin connect 6 of the DPYI of LED display circuit respectively, 8, 9, 12 pin, 4 pin connect the tie point of crystal oscillator X1 one end and electric capacity C8 one end, 5 pin connect the tie point of the crystal oscillator X1 other end and electric capacity C7 one end, 6 pin connect 6 pin of HLW8012, 9, 11 pin are unsettled need not, 10 pin and R9, C5, C7, the other end all ground connection of C8, 12 ~ 19 pin connect 11 of DPYI respectively, 7, 4, 2, 1, 10, 5, 3 pin, 12 ~ 19 pin also connect 2 ~ 9 pin of the exclusion R10 of LED display circuit respectively, 20 pin, the positive pole of C6 and C5 one end all connect+5V power supply.
5. a kind of digital power meter according to claim 1, it is characterized in that: the live wire of a termination electric main of C9 and the R11 parallel connection of power circuit, one end of another termination R12, another termination D1 negative pole of R12 and the tie point of D2 positive pole, the negative pole of D2, the negative pole of DZ1, the positive pole of C10, one end of C11 is connected with 1 pin of 78L05, 3 pin of 78L05 are connected with the positive pole of C12 for the output terminal of+5V power supply, the positive pole of D1, the positive pole of DZ1, the negative pole of C10, the other end of C11, 2 pin of 78L05 and negative pole all ground connection of C12, and connect the zero line of electric main.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510358244.1A CN104914301A (en) | 2015-06-26 | 2015-06-26 | Digital power meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510358244.1A CN104914301A (en) | 2015-06-26 | 2015-06-26 | Digital power meter |
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| CN104914301A true CN104914301A (en) | 2015-09-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030973A (en) * | 2018-05-15 | 2018-12-18 | 淮阴师范学院 | Smart grid non-intrusion type resident load observation circuit and system |
| CN109738689A (en) * | 2019-03-12 | 2019-05-10 | 攀枝花学院 | A kind of Digital AC power meter module |
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| EP1666891A1 (en) * | 2004-07-28 | 2006-06-07 | Joseph Technology Co., Ltd. | Electric plug having display means to indicate consumed power and electric energy |
| CN200965546Y (en) * | 2006-11-10 | 2007-10-24 | 浙江康泰电气有限公司 | Electricity metering and charge metering display device |
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| CN104330621A (en) * | 2014-11-11 | 2015-02-04 | 苏州工业职业技术学院 | Electric appliance energy consumption tester |
| CN104597414A (en) * | 2015-01-12 | 2015-05-06 | 擎翌(上海)智能科技有限公司 | Signal lamp or street lamp parameter detection electric method |
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2015
- 2015-06-26 CN CN201510358244.1A patent/CN104914301A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1666891A1 (en) * | 2004-07-28 | 2006-06-07 | Joseph Technology Co., Ltd. | Electric plug having display means to indicate consumed power and electric energy |
| CN200965546Y (en) * | 2006-11-10 | 2007-10-24 | 浙江康泰电气有限公司 | Electricity metering and charge metering display device |
| CN101409408A (en) * | 2008-07-31 | 2009-04-15 | 宋成法 | Power socket capable of metering electric charge with time sharing |
| CN101435833A (en) * | 2008-11-22 | 2009-05-20 | 苏州市瀛华智能电器有限公司 | Single-phase multiple-parameter electric power instrument |
| CN102508003A (en) * | 2011-11-08 | 2012-06-20 | 安徽鑫龙电器股份有限公司 | Combined electricity meter and method for measuring current, voltage and power factor |
| CN203658459U (en) * | 2013-10-31 | 2014-06-18 | 珠海中慧微电子有限公司 | Metering circuit based on SWF2L23A type chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030973A (en) * | 2018-05-15 | 2018-12-18 | 淮阴师范学院 | Smart grid non-intrusion type resident load observation circuit and system |
| CN109738689A (en) * | 2019-03-12 | 2019-05-10 | 攀枝花学院 | A kind of Digital AC power meter module |
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Application publication date: 20150916 |
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