CN201083785Y - Automatic range volt-ampere phase meter - Google Patents
Automatic range volt-ampere phase meter Download PDFInfo
- Publication number
- CN201083785Y CN201083785Y CNU2007200328204U CN200720032820U CN201083785Y CN 201083785 Y CN201083785 Y CN 201083785Y CN U2007200328204 U CNU2007200328204 U CN U2007200328204U CN 200720032820 U CN200720032820 U CN 200720032820U CN 201083785 Y CN201083785 Y CN 201083785Y
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- converter
- microcontroller
- range
- programmable gain
- gain amplifier
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Abstract
The utility model relates to an electric work measuring instrument, in particular to a volt ampere phase meter with automatic measuring range function; the utility model mainly comprises an input option switch, an I/V converter, an operational amplifier, a programmable gain amplifier, an A/D converter, a micro controller and a display screen, wherein the programmable gain amplifier and the A/D converter are integrated in the micro controller or independently arranged outside the micro controller, and the programmable gain amplifier is controlled by an automatic measuring range software module. The utility model has the advantages of simple structure and convenient operation, and can better resolve the manual shift problem existing in the conventional measuring instruments.
Description
Technical field
The present invention relates to a kind of electric instrument, specifically two pincers type volt-ampere phase meters of electrical quantitys such as measuring voltage, electric current, phase place.
Background technology
Volt-ampere phase meter such as two pincers such as at present comparatively common SMG2000, ML12 etc. is relay protection worker, calibration worker and circuit upfitter's a universal measurement instrument.The primary structure of this instrument mainly is made up of input selector switch J, divider resistance, operational amplifier, A/D converter, microcontroller and liquid crystal display as shown in Figure 1.Because the gain of operational amplifier is fixed in this circuit, can not regulate automatically, so this circuit can only be realized the range conversion in the mode of regulating the divider resistance size by changing the gear of switch J.That is, when with the electric current of this instrument measurement electric system, voltage, need to adopt manual mode, determine to select the measurement range of signal earlier, during as the measurement electric current, need set measurement range: 200mA or 2A, 10A etc. in advance, satisfy the measuring accuracy requirement, measure then.So the traditional measurement instrument exists the loaded down with trivial details shortcoming of operation.
The utility model content
The objective of the invention is to improve the deficiency that conventional instrument exists, a kind of volt-ampere phase meter of automatic range of simple operation is provided.
The present invention is achieved in that mainly containing input selector switch, I/V converter, operational amplifier, programmable gain amplifier, A/D converter, microcontroller and LCD liquid crystal display constitutes.Karyonide is controlled the automatic range software module of this programmable gain amplifier in the microcontroller.Because the microcontroller model difference of selecting, programmable gain amplifier and A/D converter can be independent of the microcontroller outside, also can be integrated in microcontroller inside.Input selector switch is used for selecting the semaphore of measuring; The I/V converter is used for the current signal of mutual inductor output is converted into voltage signal; Operational amplifier is used for improving the gain of amplification channel; Programmable gain amplifier, A/D converter and microcontroller constitute signal adjustment circuit, are responsible for automatic range and regulate and signals collecting; Microcontroller also is used for image data, and after converting authentic and valid value to, shows by liquid crystal display.
The range of automatic range is divided: the measurement range of measuring-signal is divided into several little measurement ranges promptly divides range, again according to the performance index of A/D converter, determine to satisfy under each range the gain requirement of measuring accuracy.
Principle of work of the present invention is: signal enters the automatic range regulating circuit through switch J, and microcontroller is determined input signal place range by the gain setting value of A/D sampled value and programmable-gain operational amplifier; Microcontroller is reset adjustable gain Amplifier Gain value according to the range of determining again, satisfies the gain requirement under this range; Microcontroller carries out A/D sampling again then, and gain is provided with and sampled value calculates the authentic and valid value of input signal according to range, shows by liquid crystal display.
The present invention is simple in structure, easy to operate.Not only solved the problem of hand shift, can also as required range arbitrarily have been divided, reduced, saved cost the performance demands of operational amplifier own.
Description of drawings
The two pincers of Fig. 1 .SMG2000 volt-ampere phase meter circuit theory synoptic diagram;
Fig. 2. electrical block diagram of the present invention;
Fig. 3. the schematic flow sheet of the automatic range of microcontroller.
Embodiment
Below in conjunction with embodiments of the invention of accompanying drawing narration.
Fig. 2 has shown the circuit structure of present embodiment: mainly be made of input selector switch J, I/V converter, operational amplifier, the microcontroller that contains programmable gain amplifier and A/D converter, liquid crystal display.I/V converter and operational amplifier adopt the OPA2277 operational amplifier, and microcontroller is selected the C8051F series monolithic for use.Power supply is divided into VCC, AGND, three kinds of voltages of GND, and VCC is 3.3V, is used as the power supply of microcontroller and mimic channel; AGND is 1.5V, is used as the reference mid-point voltage of mimic channel; GND is 0V, is used as the ground wire of microcontroller and mimic channel.
The input stage that input selector switch J, I/V converter constitute signal realizes the input of signal.The programmable gain amplifier of operational amplifier and microcontroller inside, A/D converter, kernel constitute automatic gain and adjust circuit, are used for processing signals.The kernel of microcontroller and A/D converter composition data are gathered, are handled, and are responsible for calculating the result.
The automatic range of present embodiment is realized: be made up of control program and hardware two parts, wherein control program is present in the microcontroller kernel, and hardware components contains following parts.
1. operational amplifier is used for compensating the gain deficiency of programmable gain amplifier.
2. the programmable gain amplifier of microcontroller inside is used for adjusting signal gain according to the present range of signal.
3. the A/D converter of microcontroller inside is used for gathering through adjusted signal.
4. the microcontroller kernel is finished the gain of control A/D sampling, the calculating present range of current input signal and control programmable gain amplifier by the program of inside.
The measurement range of setting the current range of present embodiment is 0～10A, and it is divided into 0～100mA, 100mA～1A, three ranges of 1A～10A.When measuring electric current,, enter automatic gain through switch J then and adjust circuit by the current clamp sensor current signal.Behind signal process operational amplifier, the programmable gain amplifier, the effective value of nuclear control A/D sampling in the microcontroller, calculating picked up signal; Judge the range at signal place then by microcontroller, and reset the gain of the programmable gain amplifier of microcontroller inside according to the range of judging.When gain be provided with correct after, again by microcontroller by the A/D sampling, calculate the authentic and valid value of measured signal, show by liquid crystal display.Thereby realize the surveying work of automatic range.
Fig. 3 is the automatic range process flow diagram of the present invention's microcontroller, and process is as follows:
1. microprocessor controls A/D samples to adjusted signal;
2. use root mean square method, the effective value of calculating sampling value picked up signal;
3. according to the gain setting of current programmable gain amplifier and the conversion proportion of mutual inductor, calculate the authentic and valid value of input signal;
4. according to the range ability of dividing in advance, calculate the range at input signal place;
5. judge whether the range that this range that calculates and last computation go out is identical;
(1) if identical, illustrate that this sampling is to carry out under correct gain, the authentic and valid value of the signal that the 3rd step calculated is correct.Send liquid crystal display to show effective value.Returned for the 1st step, carry out new range once and regulate.
(2) if different, illustrate that this sampling carries out under incorrect gain, there is error in the authentic and valid value of the signal that the 3rd step calculated, and the result can not satisfy accuracy requirement.So need reset the gain of programmable gain amplifier.Returned for the 1st step, carry out new range once and regulate.
Claims (2)
1. the volt-ampere phase meter of an automatic range, input selector switch J, operational amplifier, A/D converter, microcontroller and liquid crystal display are arranged, it is characterized in that: be connected with the I/V converter between input selector switch J and operational amplifier, the interior karyonide of microcontroller is controlled the automatic range software module of this programmable gain amplifier.
2. the volt-ampere phase meter of a kind of automatic range according to claim 1 is characterized in that: it is inner or be independent of the microcontroller outside that programmable gain amplifier and A/D converter are integrated in microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200328204U CN201083785Y (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200328204U CN201083785Y (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201083785Y true CN201083785Y (en) | 2008-07-09 |
Family
ID=39626254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200328204U Expired - Lifetime CN201083785Y (en) | 2007-09-20 | 2007-09-20 | Automatic range volt-ampere phase meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201083785Y (en) |
-
2007
- 2007-09-20 CN CNU2007200328204U patent/CN201083785Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XI'AN APWR ELECTRICAL SYSTEM CO., LTD. Free format text: FORMER OWNER: XI'AN AIBANG ELECTRIC CO.,LTD Effective date: 20120626 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 710025 XI'AN, SHAANXI PROVINCE TO: 710075 XI'AN, SHAANXI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120626 Address after: 710075 No. 1-401, No. 34, B, hi tech Zone, Shaanxi, Xi'an Patentee after: Xian Aibang Electronic System Co., Ltd. Address before: The road high tech Zone Technology 710025 Shaanxi city of Xi'an province No. 34 European Mianyuan block B 1-401 Patentee before: Xi'an Aibang Electric Co.,Ltd |
|
| CX01 | Expiry of patent term |
Granted publication date: 20080709 |
|
| CX01 | Expiry of patent term |