CN103033677A - Range self-adaptation type digital voltmeter and measurement method thereof - Google Patents
Range self-adaptation type digital voltmeter and measurement method thereof Download PDFInfo
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- CN103033677A CN103033677A CN2012105439938A CN201210543993A CN103033677A CN 103033677 A CN103033677 A CN 103033677A CN 2012105439938 A CN2012105439938 A CN 2012105439938A CN 201210543993 A CN201210543993 A CN 201210543993A CN 103033677 A CN103033677 A CN 103033677A
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Abstract
The invention discloses a range self-adaptation type digital voltmeter. The range self-adaptation type digital voltmeter comprises a bleeder circuit, a multi-way switch range switching circuit, a signal conditioning circuit, an analog to digital (A/D) conversion judging circuit and a main control circuit. A signal input circuit, the bleeder circuit, the multi-way switch range switching circuit, the signal conditioning circuit, the A/D conversion judging circuit, the main control circuit and a liquid crystal display (LCD) displaying circuit are connected in sequence. The main control circuit is further connected with the multi-way switch range switching circuit. The invention further discloses a measurement method of the voltmeter. The technical scheme solves the problem that a range of a digital voltmeter in the prior art can not be switched automatically. In addition, the range self-adaptation type digital voltmeter is high in switching speed, small in size, convenient to take, simple in circuits, stable and reliable in performance, accurate in measurement and wide in voltage measurement range. Meanwhile, the range self-adaptation type digital voltmeter is capable of measuring voltage of 0-2000 Volts, reducing probability of an error, reducing probability of damage of a digital universal meter, and improving use performance and efficiency.
Description
Technical field
The invention belongs to the technical field of electric test instrument and meter, relate to the voltage-measuring equipment technology, more particularly, the present invention relates to a kind of range self-adapting type digital voltmeter.In addition, the invention still further relates to the measuring method of this voltage table.
Background technology
At present, known digital voltmeter has had multiple style and type, and clear display is directly perceived, measurement range is wide.But most digital voltmeters do not have the automatic range switching function, must the manual switchover range when measuring the voltage of different brackets, otherwise can't measurement voltage signal or greatly reduce measuring accuracy; Although a few digits voltage table can automatic switching range, adopts analog switch or relay to switch more, this kind method has the shortcoming that volume is large, switch speed is relatively slow.
Summary of the invention
The invention provides a kind of range self-adapting type digital voltmeter, its objective is the automatic switchover that realizes range.
To achieve these goals, the technical scheme taked of the present invention is:
Range self-adapting type digital voltmeter provided by the present invention, described voltage table is provided with the signal input circuit of tested voltage signal, also be provided with the LCD display circuit, described voltage table also comprises bleeder circuit, multi-way switch range commutation circuit, signal conditioning circuit, A/D conversion decision circuitry, governor circuit; And connect in the following order: signal input circuit, bleeder circuit, multi-way switch range commutation circuit, signal conditioning circuit, A/D change decision circuitry, governor circuit and LCD display circuit; Described governor circuit also is connected with multi-way switch range commutation circuit.
Described multi-way switch range commutation circuit adopts the 74HC4051 integrated chip.
Described signal conditioning circuit adopts the LM358 integrated chip.
Described A/D conversion decision circuitry is the TLC7135 integrated chip.
Described governor circuit adopts the C8051F340 integrated chip.
In order to realize the goal of the invention identical with technique scheme, the present invention also provides the measuring method of described range self-adapting type digital voltmeter, and the process of this measuring method is:
Described tested voltage signal is sent into bleeder circuit, and bleeder circuit is divided into three electric pressures with voltage signal, after the classification voltage signal is sent into multi-way switch range commutation circuit;
Behind the self-adaptation switching range, the voltage signal of output carries out second-order filter through signal conditioning circuit and signal amplifies processing, and conditioning is to the discernible voltage signal grade of A/D conversion decision circuitry;
A/D conversion decision circuitry judges the voltage signal of input, exports under-voltage or overvoltage signal, sends into governor circuit;
Governor circuit receive under-voltage or the overvoltage signal after, send control signal to multi-way switch range commutation circuit, multi-way switch range commutation circuit changes the conductive channel of multi-way switch, selects the range that adapts;
After finishing measurement range selection, the magnitude of voltage that governor circuit obtains sampling is sent into the LCD display circuit.
The present invention adopts technique scheme, has solved the problem that the digital voltmeter range can not automatically switch in the prior art, and switch speed is fast, volume is little, be easy to carry; Circuit is simple, and is stable and reliable for performance; Measure accurately, the voltage measurement wide ranges can be measured the voltage of 0-2000V; Can reduce the error probability, reduce the probability of damage of digital multimeter, improve its usability and efficient.
Description of drawings
The below makes brief description to the expressed content of each width of cloth accompanying drawing of this instructions and the mark among the figure:
Fig. 1 is system architecture diagram of the present invention;
Fig. 2 is the bleeder circuit figure among Fig. 1;
Fig. 3 is the multi-way switch range commutation circuit figure among Fig. 1;
Fig. 4 is the signal conditioning circuit figure among Fig. 1;
Fig. 5 is the A/D conversion decision circuitry figure among Fig. 1;
Fig. 6 is the governor circuit figure among Fig. 1;
Fig. 7 is the LCD display circuit figure among Fig. 1.
Being labeled as among Fig. 1:
1, signal input circuit, 2, bleeder circuit, 3, multi-way switch range commutation circuit, 4, signal conditioning circuit, 5, A/D changes decision circuitry, 6, governor circuit, 7, the LCD display circuit.
Embodiment
The below contrasts accompanying drawing, and the description by to embodiment is described in further detail the specific embodiment of the present invention, to help those skilled in the art inventive concept of the present invention, technical scheme is had more complete, accurate and deep understanding.
The of the present invention structure expressed such as Fig. 1 to Fig. 7 is a kind of range self-adapting type digital voltmeter, and described voltage table is provided with the signal input circuit 1 of tested voltage signal, also is provided with LCD display circuit 7.
In order to solve the problem that prior art exists and to overcome its defective, realize the goal of the invention of the automatic switchover of range, the technical scheme that the present invention takes is:
As shown in Figure 1, range self-adapting type digital voltmeter provided by the present invention comprises bleeder circuit 2, multi-way switch range commutation circuit 3, signal conditioning circuit 4, A/D conversion decision circuitry 5, governor circuit 6; And connect in the following order: signal input circuit 1, bleeder circuit 2, multi-way switch range commutation circuit 3, signal conditioning circuit 4, A/D change decision circuitry 5, governor circuit 6 and LCD display circuit 7; Described governor circuit 6 also is connected with multi-way switch range commutation circuit 3.
The present invention solves the problem that existing digital voltmeter range can not automatically switch, and the range switch speed is fast, volume is little, be easy to carry.Compared with prior art, the invention has the beneficial effects as follows:
1, circuit is simple, and is stable and reliable for performance;
2, measure accurately, the voltage measurement wide ranges can be measured the voltage of 0-2000V;
3, can reduce the error probability, reduce the probability of damage of digital multimeter, improve its usability and efficient.
During measurement, bleeder circuit is divided into three electric pressures with input signal, voltage signal after the classification is sent into multi-way switch range commutation circuit, behind the self-adaptation switching range, the voltage signal of output carries out second-order filter through signal conditioning circuit and signal amplifies processing, access A/D conversion decision circuitry, A/D conversion decision circuitry judges input voltage signal, exports under-voltage or the overvoltage signal is sent into governor circuit.Governor circuit receive under-voltage or the overvoltage signal after, then send control signal to multi-way switch range commutation circuit, select the range adapt, the magnitude of voltage that the main control chip circuit obtained sampling after measurement range selection was correct is sent into the LCD display circuit.
Described multi-way switch range commutation circuit 3 adopts the 74HC4051 integrated chip.
Described signal conditioning circuit 4 adopts the LM358 integrated chip.
Described A/D conversion decision circuitry 5 is the TLC7135 integrated chip.
Described governor circuit 6 adopts the C8051F340 integrated chip.
As shown in Figure 3, multi-way switch range commutation circuit 3 of the present invention adopts the 74HC4051 integrated chip, 13 pin Y0 of 0-20V access multi-way switch chip; 14 pin Y1 of 20-200V access multi-way switch chip; 15 pin Y2 of 200-2000V access multi-way switch chip.
As shown in Figure 4, signal conditioning circuit 4 of the present invention adopts the LM358 integrated chip, after the voltage signal that signal conditioning circuit is exported multi-way switch range commutation circuit 3 carries out second-order filter and signal amplification processing, and access A/D conversion decision circuitry 5.
As shown in Figure 5, A/D conversion decision circuitry 5 of the present invention adopts the TLC7135 chip, and input voltage range is at 0.18-2V.The voltage signal of output is connected with 10 pin of A/D conversion chip after the conditioning.If the conditioning after voltage signal be lower than 0.18V then TLC7135 chip 28 pin export under-voltage signal, if the conditioning after voltage signal be higher than then TLC7135 chip 27 pin output overvoltage signals of 2V.
As shown in Figure 6, governor circuit 6 of the present invention adopts the C8051F340 integrated chip.Overvoltage be connected signal output port respectively with 40 pin of main control chip with are connected pin and are connected.In order to protect digital voltmeter, the gear of start acquiescence is 200-2000V.After governor circuit 6 received the under-voltage signal that the A/D conversion chip sends, main control chip was to its P0.3 that is connected with multi-way switch range commutation circuit chip.
In order to realize the goal of the invention identical with technique scheme, the present invention also provides the measuring method of described range self-adapting type digital voltmeter, and the process of this measuring method is:
Described tested voltage signal is sent into bleeder circuit 2, and bleeder circuit 2 is divided into three electric pressures with voltage signal, after the classification voltage signal is sent into multi-way switch range commutation circuit 3;
Behind the self-adaptation switching range, the voltage signal of output carries out second-order filter through signal conditioning circuit 4 and signal amplifies processing, and conditioning is to A/D conversion decision circuitry 5 discernible voltage signal grades;
The voltage signal of 5 pairs of inputs of A/D conversion decision circuitry judges, and exports under-voltage or overvoltage signal, sends into governor circuit 6;
After finishing measurement range selection, the magnitude of voltage that governor circuit 6 obtains sampling is sent into LCD display circuit 7.
The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.
Claims (6)
1. range self-adapting type digital voltmeter, described voltage table is provided with the signal input circuit (1) of tested voltage signal, also be provided with LCD display circuit (7), it is characterized in that: described voltage table also comprises bleeder circuit (2), multi-way switch range commutation circuit (3), signal conditioning circuit (4), A/D conversion decision circuitry (5), governor circuit (6); And connect in the following order: signal input circuit (1), bleeder circuit (2), multi-way switch range commutation circuit (3), signal conditioning circuit (4), A/D change decision circuitry (5), governor circuit (6) and LCD display circuit (7); Described governor circuit (6) also is connected with multi-way switch range commutation circuit (3).
2. according to range self-adapting type digital voltmeter claimed in claim 1, it is characterized in that: described multi-way switch range commutation circuit (3) adopts the 74HC4051 integrated chip.
3. according to range self-adapting type digital voltmeter claimed in claim 1, it is characterized in that: described signal conditioning circuit (4) adopts the LM358 integrated chip.
4. according to range self-adapting type digital voltmeter claimed in claim 1, it is characterized in that: described A/D conversion decision circuitry (5) is the TLC7135 integrated chip.
5. according to range self-adapting type digital voltmeter claimed in claim 1, it is characterized in that: described governor circuit (6) adopts the C8051F340 integrated chip.
6. according to the measuring method of each described range self-adapting type digital voltmeter in the claim 1 to 5, it is characterized in that: the process of described measuring method is:
Described tested voltage signal is sent into bleeder circuit (2), and bleeder circuit (2) is divided into three electric pressures with voltage signal, after the classification voltage signal is sent into multi-way switch range commutation circuit (3);
Behind the self-adaptation switching range, the voltage signal of output carries out second-order filter through signal conditioning circuit (4) and signal amplifies processing, and conditioning is to the discernible voltage signal grade of A/D conversion decision circuitry (5);
A/D conversion decision circuitry (5) judges the voltage signal of input, exports under-voltage or overvoltage signal, sends into governor circuit (6);
Governor circuit (6) receive under-voltage or the overvoltage signal after, send control signal to multi-way switch range commutation circuit (3), multi-way switch range commutation circuit (3) changes the conductive channel of multi-way switch, selects the range that adapts;
After finishing measurement range selection, the magnitude of voltage that governor circuit (6) obtains sampling is sent into LCD display circuit (7).
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267233A (en) * | 2014-09-29 | 2015-01-07 | 国家电网公司 | Program control self-adaption switching circuit of meter ranges and switching control method thereof |
| CN106405432A (en) * | 2016-11-04 | 2017-02-15 | 优利德科技(中国)有限公司 | Multi-state battery power monitoring method and monitoring instrument |
| CN106443158A (en) * | 2016-11-04 | 2017-02-22 | 优利德科技(中国)有限公司 | Sensing method for displaying multi-state NCV and sensing device |
| CN106568997A (en) * | 2016-11-15 | 2017-04-19 | 深圳市鼎阳科技有限公司 | Switching control method and device of multimeter current range |
| CN106771525A (en) * | 2017-01-17 | 2017-05-31 | 华霆（合肥）动力技术有限公司 | Voltage detection method, device and voltage tester |
| CN107015177A (en) * | 2017-06-01 | 2017-08-04 | 北京市京核鑫隆科技中心 | Magnetic declination dipmeter automatic range switching circuit |
| CN107219402A (en) * | 2017-06-07 | 2017-09-29 | 中国电子科技集团公司第二十四研究所 | A kind of circuit for quick measurement of DC resistance for power module port |
| CN108896851A (en) * | 2018-07-24 | 2018-11-27 | 上海思源弘瑞自动化有限公司 | A kind of switch quantity acquisition circuit |
| CN108931336A (en) * | 2017-05-23 | 2018-12-04 | 北京航天计量测试技术研究所 | A kind of high stability pressure control algorithm |
| CN111025008A (en) * | 2019-12-31 | 2020-04-17 | 深圳市有方科技股份有限公司 | Voltage detection method and device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267233A (en) * | 2014-09-29 | 2015-01-07 | 国家电网公司 | Program control self-adaption switching circuit of meter ranges and switching control method thereof |
| CN106405432A (en) * | 2016-11-04 | 2017-02-15 | 优利德科技(中国)有限公司 | Multi-state battery power monitoring method and monitoring instrument |
| CN106443158A (en) * | 2016-11-04 | 2017-02-22 | 优利德科技(中国)有限公司 | Sensing method for displaying multi-state NCV and sensing device |
| CN106568997B (en) * | 2016-11-15 | 2019-06-07 | 深圳市鼎阳科技有限公司 | A kind of multimeter current range method for handover control and device |
| CN106568997A (en) * | 2016-11-15 | 2017-04-19 | 深圳市鼎阳科技有限公司 | Switching control method and device of multimeter current range |
| CN106771525A (en) * | 2017-01-17 | 2017-05-31 | 华霆（合肥）动力技术有限公司 | Voltage detection method, device and voltage tester |
| CN106771525B (en) * | 2017-01-17 | 2019-07-26 | 华霆（合肥）动力技术有限公司 | Voltage detection method, device and voltage tester |
| CN108931336A (en) * | 2017-05-23 | 2018-12-04 | 北京航天计量测试技术研究所 | A kind of high stability pressure control algorithm |
| CN107015177A (en) * | 2017-06-01 | 2017-08-04 | 北京市京核鑫隆科技中心 | Magnetic declination dipmeter automatic range switching circuit |
| CN107015177B (en) * | 2017-06-01 | 2023-08-01 | 北京市京核鑫隆科技中心 | Automatic range switching circuit of declination inclinometer |
| CN107219402A (en) * | 2017-06-07 | 2017-09-29 | 中国电子科技集团公司第二十四研究所 | A kind of circuit for quick measurement of DC resistance for power module port |
| CN107219402B (en) * | 2017-06-07 | 2019-06-21 | 中国电子科技集团公司第二十四研究所 | A kind of circuit for quick measurement of DC resistance for power module port |
| CN108896851A (en) * | 2018-07-24 | 2018-11-27 | 上海思源弘瑞自动化有限公司 | A kind of switch quantity acquisition circuit |
| CN108896851B (en) * | 2018-07-24 | 2021-06-18 | 上海思源弘瑞自动化有限公司 | Switching value acquisition circuit |
| CN111025008A (en) * | 2019-12-31 | 2020-04-17 | 深圳市有方科技股份有限公司 | Voltage detection method and device |
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Application publication date: 20130410 |