CN2417478Y - Portable and digital type instrument for measuring power and electric energy - Google Patents
Portable and digital type instrument for measuring power and electric energy Download PDFInfo
- Publication number
- CN2417478Y CN2417478Y CN 00208316 CN00208316U CN2417478Y CN 2417478 Y CN2417478 Y CN 2417478Y CN 00208316 CN00208316 CN 00208316 CN 00208316 U CN00208316 U CN 00208316U CN 2417478 Y CN2417478 Y CN 2417478Y
- Authority
- CN
- China
- Prior art keywords
- pin
- power
- circuit
- input
- integrated package
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Power Sources (AREA)
Abstract
The utility model relates to a portable and digital type instrument for measuring power and electric energy. The utility model is characterized in that an analog input pin of an integrated module of a digital power switching circuit is connected with an external connecting measuring terminal, the output of the digital power switching circuit is connected with a single chip computer and a liquid crystal driving circuit, and the output of which is connected with a liquid crystal display; a keyboard is connected with the single chip computer and the liquid crystal driving circuit, and a power supply and a low voltage detecting circuit adopt voltage stabilizing power supply through batteries and provide DC voltage stabilizing voltage and low voltage detecting signals for the digital power switching circuit, the single chip computer and the liquid crystal driving circuit. The utility model has the advantages of simple structure, stable performance, high precision, convenient operation and low cost.
Description
The utility model relates to the electrotechnical measurement instrument, and especially a kind of portable digital power, power meter can be widely used in electric industry department, enterprises and institutions, school, family etc.
Notification number is that CN2364467Y discloses a kind of " high accuracy number power, watt-hour meter ", this table is made up of shell, portable handle, pilot lamp, power display screen, electric degree counter, slide, alternating current-direct current selector switch, double-range selector switch, power switch, voltage input positive and negative electrode terminal, electric current input positive and negative electrode terminal, wiring board, bonnet etc., it mainly is an analog multiplier to be housed on the wiring board in housing, and a voltage-to-frequency converter is arranged on the lower line plate.This power watt-hour meter AC/DC universal can carry out the synchro measure of power, electric degree, and precision height, security performance are good, double-range is selected.But this utility model also has the following disadvantages: (one) adopts the analog multiplier mode, so the linearity and precision is stable poor; (2) adopt mechanical part such as stepper motor, less reliable; (3) circuit power consumption is big, can only adopt ac power supply method, and it is convenient inadequately to use.
The purpose of this utility model is to overcome deficiency of the prior art and a kind of portable digital power, power meter is provided, and makes it simple advanced, high, the stable performance of precision of circuit structure; Carry, operation, simple and convenient; Production cost is low.
The technical scheme that realizes the purpose of the utility model is: portable digital power, power meter contain tool housing, keyboard, LCD, it is characterized in that: it also has digital power change-over circuit, one-chip computer and liquid crystal display drive circuit and power supply and low-voltage detection circuit, the integrated package U of digital power change-over circuit
1Four analog input pin be connected with four external measurement connection terminals respectively, the digital power change-over circuit is converted to electric current and voltage sampling signal digital quantity and exports one-chip computer to and liquid crystal display drive circuit, the output of one-chip computer and liquid crystal display drive circuit connects LCD, keyboard is connected with one-chip computer and liquid crystal display drive circuit, power supply and low-voltage detection circuit adopt battery voltage stabilizing power supply mode, provide voltage of direct-flow voltage regulation and low voltage detection to digital power change-over circuit and one-chip computer and liquid crystal display drive circuit respectively.
Digital power change-over circuit described in the utility model mainly comprises integrated package U
1Its analog input pin 5,6,7,8 connects four external measurement connection terminals 1,2,3,4 respectively, wherein input pin 5,6 is the electric current input, input pin 7,8 is the voltage input, digital power pin 1 and analog power pin 3 and connect after connect direct supply, Hi-pass filter is selected the integrated package U of pin 2 order sheet computing machines and liquid crystal display drive circuit
2Output pin 22, resetting pin 9 connects direct supply, reference voltage pin 10 connects capacitor C
7The back also connects back ground connection with analogue ground pin 11, calibration frequency output select pin 12 and calibration frequency select pin 13,14 and connect after connect direct supply, the analog input channel gain selects pin 15,16 to meet integrated package U
2Output pin 23,24, pin 17,18 meets crystal oscillator X
1, power polarity output pin 20 meets integrated package U
2Input pin 18,21 ground connection digitally, calibration frequency logic output pin 22 meets integrated package U
2Input pin 17.
One-chip computer described in the utility model and liquid crystal display drive circuit mainly comprise integrated package U
2, wherein display common signal output pin 1～4 and display segment signal output pin 53～64 meet the input pin 1～16 of LCD, integrated package U
2Display power supply control pin 5～8 connect by resistance R
11, R
12, R
13, R
14The bleeder circuit of forming, power supply input pin 9 connects direct supply, pin 10 ground connection, main system clock input pin 11,12 connecting resistance R
9, test signal pin 13 ground connection, subsystem clock input pin 14,15 meets crystal oscillator X2, resetting pin 16 connecting resistance R
8And capacitor C
9Common point, input and output pin 17,18,22,23,24 respectively with the integrated package U of digital power change-over circuit
1Calibration frequency logic output pin 22, power polarity output pin 20, Hi-pass filter select pin 2, analog input channel gain to select pin 15,16 to be connected, input pin 27 connects the emitter of the triode T of low-voltage detection circuit in power supply and the low-voltage detection circuit, and input and output pin 29～32 connects keyboard.
Power supply described in the utility model and low-voltage detection circuit comprise by battery BAT, power switch K, DC voltage-stabilizing integrated package U
3And capacitor C
5, C
6Form the battery direct current regulation circuit; By resistance R
5, R
6, R
7Battery low-voltage testing circuit with triode T composition.
Advantage and good effect that the utility model is compared with prior art had are: adopt the method for the large scale integrated circuit of advanced digital multiplier principle to come the simplified design circuit, obviously digital circuit is than mimic channel stable performance, and the linearity is good and production cost is low; Adopt battery powered mu balanced circuit and low-voltage detection circuit to guarantee the stable of power supply, thereby guarantee higher precision and stability, and powered battery is carried easy to operate; Use one-chip computer and liquid crystal display to make instrument performance reliable, flexible operation is as long as adjust the needs that software just can satisfy different user.
Below by specific embodiment and contrast accompanying drawing the utility model is described:
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is the electrical schematic diagram of the utility model embodiment.
As shown in Figure 1, the utility model comprises tool housing 1, keyboard 2, LCD 3, digital power change-over circuit 4, one-chip computer and liquid crystal display drive circuit 5 and power supply and low-voltage detection circuit 6.
Tool housing 1 is a portable instrument, and keyboard 2 has four button K
1, K
2, K
3, K
4, LCD LCD 3 is the display terminal of measurement result.This routine digital power change-over circuit 4 mainly comprises integrated package U
1, its analog input pin 5,6,7,8 connects four external measurement connection terminals 1,2,3,4 respectively, and wherein input pin 5,6 is the electric current input, and input pin 7,8 is voltage input, R
10Be current sampling resistor, R
20With R
3Form the voltage sampling of bleeder circuit, R to circuit-under-test
1C
1, R
2C
2, R
3C
3, R
4C
4Form filtering circuit.Digital power pin 1 and analog power pin 3 and connect after connect the 5V direct current, Hi-pass filter selects pin 2 to meet integrated package U
2Output pin 22, pin 4 is empty pin, resetting pin 9 connects the 5V direct current, reference voltage pin 10 meets capacitor C
7The back also connects back ground connection with analogue ground pin 11, calibration frequency output select pin 12 and calibration frequency select pin 13,14 and connect after meet direct current 5V, the analog input channel gain selects pin 15,16 to meet integrated package U
2Output pin 23,24, pin 17,18 meets crystal oscillator X
1, pin 19 is empty pin, power polarity output pin 20 meets integrated package U
2Input pin 18,21 ground connection digitally, calibration frequency logic output pin 22 meets integrated package U
2Input pin 17, pin 23,24 is empty pin.
One-chip computer and liquid crystal display drive circuit 5 mainly comprise integrated package U
2, wherein display common signal output pin 1～4 and display segment shows signal output pin 53～64 meet the input pin 1～16 of LCD LCD 3, integrated package U
2Display power supply control pin 5～8 connect by resistance R
11, R
12, R
13, R
14The bleeder circuit of forming, power supply input pin 9 connects the 5V direct current, pin 10 ground connection, main system clock input pin 11,12 connecting resistance R
9, test signal pin 13 ground connection, subsystem clock input pin 14,15 meets crystal oscillator X
2, resetting pin 16 connecting resistance R
8With capacitor C
9Common point, input and output pin 17,18,22,23,24 respectively with integrated package U
1Calibration frequency logic output pin 22, power polarity output pin 20, Hi-pass filter select pin 2, analog input channel gain to select pin 15,16 to be connected, input pin 27 connects the emitter of the triode T of low-voltage detection circuit in power supply and the low-voltage detection circuit 6, input and output pin 29～32 connects four buttons of keyboard 2, and all the other pin are empty pin.
Power supply and low-voltage detection circuit 6 are made up of two parts, and the DC power voltage stabilizing part is by battery BAT, power switch K, DC voltage-stabilizing integrated package U
3And capacitor C
5, C
6Form, the battery low-voltage test section is by resistance R
5, R
6, R
7And triode T forms.
Principle of work of the present utility model is: power supply phase line (or anodal) inserts the current sampling connection terminal 2 and the voltage sampling connection terminal 4 of instrument, the center line of power supply (or negative pole) inserts the voltage sampling connection terminal 3 and the load R of instrument, the current sampling connection terminal 1 of another termination instrument of load R, electric current, voltage sampling signal are through R
1C
1, R
2C
2, R
3C
3, R
4C
4Behind the signal filter circuit of forming, enter digital power converter ic U
1Electric current and voltage sampling signal are converted to digital quantity, obtain the instantaneous power value of circuit-under-test with the digital multiplication mode, and export this power digital quantity to one-chip computer and liquid crystal display drive circuit 5, single-chip microcomputer contains software program, average power and electric power signal that it can become to be easy to observe with the instantaneous power conversion of signals by user's requirement, and pass through liquid crystal display displays.The user can select needed function by keyboard 2, and as measurement range selection, reading maintenance etc., single-chip microcomputer is accepted to export the control signal of controlling each duty behind the keyboard operation signal.Power supply and low-voltage detection circuit 6 provide stable dc supply for other each circuit, and export the low voltage detection that battery is about to exhaust to one-chip computer.
Main components and parts inventory:
Integrated package U1:AD7755
Integrated package U2:KS57P2304
Integrated package U3:78L05
LCD ：6N451MUF
Claims (4)
1. a portable digital power, power meter, contain tool housing (1), keyboard (2), LCD (3), it is characterized in that: it also has digital power change-over circuit (4), one-chip computer and liquid crystal display drive circuit (5) and power supply and low-voltage detection circuit (6), the integrated package U of digital power change-over circuit (4)
1Four analog input pin be connected with four external measurement connection terminals respectively, the digital power change-over circuit is converted to electric current and voltage sampling signal digital quantity and exports one-chip computer to and liquid crystal display drive circuit (5), the output of one-chip computer and liquid crystal display drive circuit connects LCD (3), keyboard (2) is connected with one-chip computer and liquid crystal display drive circuit, power supply and low-voltage detection circuit (6) adopt battery voltage stabilizing power supply mode, provide D.C. regulated power supply and low voltage detection to digital power change-over circuit (4) and one-chip computer and liquid crystal display drive circuit (5) respectively.
2. portable digital power as claimed in claim 1, power meter is characterized in that: described digital power change-over circuit (4) mainly comprises integrated package U
1Its analog input pin 5,6,7,8 connects four external measurement connection terminals 1,2,3,4 respectively, wherein input pin 5,6 is the electric current input, input pin 7,8 is the voltage input, digital power pin 1 and analog power pin 3 and connect after connect direct supply, Hi-pass filter is selected the integrated package U of pin 2 order sheet computing machines and liquid crystal display drive circuit (5)
2Output pin 22, resetting pin 9 connects direct supply, reference voltage pin 10 meets capacitor C
7The back also connects back ground connection with analogue ground pin 11, calibration frequency output select pin 12 and calibration frequency select pin 13,14 and connect after connect direct supply, the analog input channel gain selects pin 15,16 to meet integrated package U
2Output pin 23,24, pin 17,18 meets crystal oscillator X
1, power polarity output pin 20 meets integrated package U
2Input pin 18,21 ground connection digitally, calibration frequency logic output pin 22 meets integrated package U
2Input pin 17.
3. portable digital power as claimed in claim 1, power meter is characterized in that: described one-chip computer and liquid crystal display drive circuit (5) mainly comprise integrated package U
2, wherein display common signal output pin 1～4 and display segment signal output pin 53～64 meet the input pin 1～16 of LCD (3), integrated package U
2Display power supply control pin 5～8 connect by resistance R
11, R
12, R
13, R
14The bleeder circuit of forming, power supply input pin 9 connects direct supply, pin 10 ground connection, main system clock input pin 11,12 connecting resistance R
9, test signal pin 13 ground connection, subsystem clock input pin 14,15 meets crystal oscillator X
2, resetting pin 16 connecting resistance R
8And capacitor C
9Common point, input and output pin 17,18,22,23,24 minutes in addition with the integrated package U of digital power change-over circuit (4)
1Calibration frequency logic output pin 22, power polarity output pin 20, Hi-pass filter select pin 2, analog input channel gain to select pin 15,16 to be connected, input pin 27 connects the emitter of the triode T of low-voltage detection circuit in power supply and the low-voltage detection circuit (6), and input and output pin 29～32 connects keyboard (2).
4. portable digital power as claimed in claim 1, power meter is characterized in that: described power supply and low-voltage detection circuit (6) comprise by battery BAT, power switch K, DC voltage-stabilizing integrated package U
3And capacitor C
5, C
6The battery direct current regulation circuit of forming; By resistance R
5, R
6, R
7Battery low-voltage testing circuit with triode T composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00208316 CN2417478Y (en) | 2000-04-12 | 2000-04-12 | Portable and digital type instrument for measuring power and electric energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00208316 CN2417478Y (en) | 2000-04-12 | 2000-04-12 | Portable and digital type instrument for measuring power and electric energy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2417478Y true CN2417478Y (en) | 2001-01-31 |
Family
ID=33575726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00208316 Expired - Fee Related CN2417478Y (en) | 2000-04-12 | 2000-04-12 | Portable and digital type instrument for measuring power and electric energy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2417478Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148885A (en) * | 2013-03-18 | 2013-06-12 | 核工业理化工程研究院 | Portable tester |
| CN103162743A (en) * | 2013-04-12 | 2013-06-19 | 核工业理化工程研究院 | Single-channel detection instrument based on digital signal processor (DSP) |
| CN104931100A (en) * | 2015-06-17 | 2015-09-23 | 核工业理化工程研究院 | Microcontroller-based disk loading rotation speed power consumption tester |
| CN109444536A (en) * | 2018-11-23 | 2019-03-08 | 广东电网有限责任公司 | A kind of electric power consumption detection device of adaptive signal transmission |
-
2000
- 2000-04-12 CN CN 00208316 patent/CN2417478Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148885A (en) * | 2013-03-18 | 2013-06-12 | 核工业理化工程研究院 | Portable tester |
| CN103162743A (en) * | 2013-04-12 | 2013-06-19 | 核工业理化工程研究院 | Single-channel detection instrument based on digital signal processor (DSP) |
| CN103162743B (en) * | 2013-04-12 | 2015-03-18 | 核工业理化工程研究院 | Single-channel detection instrument based on digital signal processor (DSP) |
| CN104931100A (en) * | 2015-06-17 | 2015-09-23 | 核工业理化工程研究院 | Microcontroller-based disk loading rotation speed power consumption tester |
| CN109444536A (en) * | 2018-11-23 | 2019-03-08 | 广东电网有限责任公司 | A kind of electric power consumption detection device of adaptive signal transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110794207A (en) | Three-phase manganin sampling alternating current guide rail meter | |
| CN205228803U (en) | Isolator state test device | |
| CN201909811U (en) | Three-phase watt-hour meter based on MSP430 singlechip | |
| CN2417478Y (en) | Portable and digital type instrument for measuring power and electric energy | |
| CN113064018B (en) | Direct current charging pile metering detection circuit, device and method | |
| CN207908608U (en) | Metering device wire searcher | |
| CN201215505Y (en) | Digital weighing controller | |
| CN2556651Y (en) | Automatic range digital AC/DC pincerlike multimeter | |
| CN107831358A (en) | A kind of current measurement device based on MAX4373HEUA | |
| CN2482055Y (en) | Digital angle measurer | |
| CN103176022A (en) | Digital multimeter with automatic range conversion function | |
| CN102539870A (en) | Portable high-precision multifunctional testing instrument | |
| CN202058089U (en) | Digital power supply and external displaying device connected with same | |
| CN200965551Y (en) | Multi-functional digital watt-hour meter | |
| CN1570653A (en) | MSP430FE42x single phase multifunctional electric energy meter and metering method | |
| CN202939219U (en) | Multichannel intelligent electric quantity module | |
| CN2364467Y (en) | High-accuracy digital power and KWH meter | |
| CN206804120U (en) | A kind of accurate electronic scale device of intelligent portable | |
| CN216117834U (en) | Handheld transformer no-load loss test circuit | |
| CN220105241U (en) | Dial type electric quantity indicating structure for mobile power supply | |
| CN218445948U (en) | Automatic load box control system of voltage transformer | |
| CN2172478Y (en) | Multifunctional electronic watt-hour meter | |
| CN218332747U (en) | Bluetooth prepayment electric energy meter | |
| CN202929195U (en) | Electrician meter | |
| CN214278405U (en) | Multi-functional fortune dimension terminal of electric energy meter with wiring analysis function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: PATENTEE; FROM: YAO WEILIAN TO: HANGZHOU HUAXIN INTELLIGENT INSTRUMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Hangzhou Huaxin Intelligent Instrument Co., Ltd. Patentee before: Yao Weilian |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |