CN202975141U - Range-adaptive digital voltmeter - Google Patents
Range-adaptive digital voltmeter Download PDFInfo
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- CN202975141U CN202975141U CN 201220694554 CN201220694554U CN202975141U CN 202975141 U CN202975141 U CN 202975141U CN 201220694554 CN201220694554 CN 201220694554 CN 201220694554 U CN201220694554 U CN 201220694554U CN 202975141 U CN202975141 U CN 202975141U
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Abstract
The utility model discloses a range-adaptive digital voltmeter. The range-adaptive digital voltmeter comprises a voltage division circuit, a multi-way switch range switching circuit, a signal conditioning circuit, an A/D (analog to digital) conversion judgment circuit and a main control circuit, a signal input circuit, the voltage division circuit, the multi-way switch range switching circuit, the signal conditioning circuit, the A/D conversion judgment circuit, the main control circuit and an LCD (liquid crystal display) displaying circuit are connected in sequence, and the main control circuit is also connected with the multi-way switch range switching circuit. By the technical scheme, the range-adaptive digital voltmeter solves the problem that ranges of a digital voltmeter cannot be switched automatically in the prior art, and is high in switching speed, small in size, portable, simple in circuit, stable and reliable in performance, accurate in measurement, wide in voltage measurement range and capable of measuring voltage within the range of 0-2000V, error probability can be reduced, probability of damage of digital multimeters is decreased, and usability and efficiency of the range-adaptive digital voltmeter are improved.
Description
Technical field
The utility model belongs to the technical field of electric test instrument and meter, relates to the voltage-measuring equipment technology, and more particularly, the utility model relates to a kind of range self-adapting type digital voltmeter.
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.
The utility model content
The utility model 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 utility model is:
Range self-adapting type digital voltmeter provided by the utility model, 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 utility model 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 classification, voltage signal is sent into multi-way switch range commutation circuit;
After 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 completing measurement range selection, the magnitude of voltage that governor circuit obtains sampling is sent into the LCD display circuit.
The utility model adopts technique scheme, has solved the problem that in the prior art, the digital voltmeter range can not automatically switch, 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 is briefly described the expressed content of each width accompanying drawing of this instructions and the mark in figure:
Fig. 1 is system architecture diagram of the present utility model;
Fig. 2 is the bleeder circuit figure in Fig. 1;
Fig. 3 is the multi-way switch range commutation circuit figure in Fig. 1;
Fig. 4 is the signal conditioning circuit figure in Fig. 1;
Fig. 5 is the A/D conversion decision circuitry figure in Fig. 1;
Fig. 6 is the governor circuit figure in Fig. 1;
Fig. 7 is the LCD display circuit figure in Fig. 1.
Being labeled as in 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, by the description to embodiment, embodiment of the present utility model is described in further detail, and to help those skilled in the art, inventive concept of the present utility model, technical scheme is had more complete, accurate and deep understanding.
Structure of the present utility model as expressed in 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 utility model is taked is:
As shown in Figure 1, range self-adapting type digital voltmeter provided by the utility model 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 utility model 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 beneficial effects of the utility model are:
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 classification is sent into multi-way switch range commutation circuit, after 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, send control signal to multi-way switch range commutation circuit, select the range adapt, the magnitude of voltage that after measurement range selection is correct, the main control chip circuit obtains sampling 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 described in the utility model 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 described in the utility model 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 described in the utility model adopts the TLC7135 chip, and input voltage range is at 0.18-2V.After conditioning, the voltage signal of output is connected with 10 pin of A/D conversion chip.If after conditioning, voltage signal is lower than 0.18V TLC7135 chip 28 under-voltage signals of pin output, if after conditioning, voltage signal is higher than 2V TLC7135 chip 27 pin output overvoltage signals.
As shown in Figure 6, governor circuit 6 described in the utility model 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 utility model 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 classification, voltage signal is sent into multi-way switch range commutation circuit 3;
After 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;
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 completing measurement range selection, the magnitude of voltage that governor circuit 6 obtains sampling is sent into LCD display circuit 7.
The above is exemplarily described the utility model by reference to the accompanying drawings; obviously the utility model specific implementation is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present utility model design and technical scheme carry out; or without improving, design of the present utility model and technical scheme are directly applied to other occasion, all within protection domain of the present utility model.
Claims (5)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694554 CN202975141U (en) | 2012-12-15 | 2012-12-15 | Range-adaptive digital voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220694554 CN202975141U (en) | 2012-12-15 | 2012-12-15 | Range-adaptive digital voltmeter |
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| Publication Number | Publication Date |
|---|---|
| CN202975141U true CN202975141U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220694554 Expired - Fee Related CN202975141U (en) | 2012-12-15 | 2012-12-15 | Range-adaptive digital voltmeter |
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| CN (1) | CN202975141U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033677A (en) * | 2012-12-15 | 2013-04-10 | 安徽工程大学 | Range self-adaptation type digital voltmeter and measurement method thereof |
| CN104849086A (en) * | 2015-06-03 | 2015-08-19 | 核工业理化工程研究院 | DSP-based multi-channel detection instrument |
| CN105372469A (en) * | 2014-08-13 | 2016-03-02 | 浙江巨磁智能技术有限公司 | Method for adjusting measuring range of current sensor and sensor utilizing the method |
| CN105759112A (en) * | 2016-05-24 | 2016-07-13 | 南宁市茂百科技有限公司 | Digital voltage meter achieving automatic range switching |
| 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 |
-
2012
- 2012-12-15 CN CN 201220694554 patent/CN202975141U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033677A (en) * | 2012-12-15 | 2013-04-10 | 安徽工程大学 | Range self-adaptation type digital voltmeter and measurement method thereof |
| CN105372469A (en) * | 2014-08-13 | 2016-03-02 | 浙江巨磁智能技术有限公司 | Method for adjusting measuring range of current sensor and sensor utilizing the method |
| CN104849086A (en) * | 2015-06-03 | 2015-08-19 | 核工业理化工程研究院 | DSP-based multi-channel detection instrument |
| CN104849086B (en) * | 2015-06-03 | 2018-09-14 | 核工业理化工程研究院 | Multi-channel detection instrument based on DSP |
| CN105759112A (en) * | 2016-05-24 | 2016-07-13 | 南宁市茂百科技有限公司 | Digital voltage meter achieving automatic range switching |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20151215 |
|
| EXPY | Termination of patent right or utility model |