CN201859176U - Direct current micro voltage/micro current detection device - Google Patents
Direct current micro voltage/micro current detection device Download PDFInfo
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- CN201859176U CN201859176U CN2010205948440U CN201020594844U CN201859176U CN 201859176 U CN201859176 U CN 201859176U CN 2010205948440 U CN2010205948440 U CN 2010205948440U CN 201020594844 U CN201020594844 U CN 201020594844U CN 201859176 U CN201859176 U CN 201859176U
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Abstract
The utility model discloses a direct current micro voltage/micro current detection device, which comprises an oscillation circuit, a digital signal amplification circuit, a subtractor and a numerical value conversion circuit, wherein the oscillation circuit comprises a first voltage control oscillator and a second voltage control oscillator that have same parameters; the input end of the first voltage control oscillator is connected with the to-be-detected signal output end or grounded; the input end of the second voltage control oscillator is grounded or connected with the to-be-detected signal output end; the output ends of the first and the second voltage control oscillators are respectively connected with the input end of the digital signal amplification circuit; the output end of the digital signal amplification circuit is connected with the input end of the subtractor; the output end of the subtractor is connected with the input end of the numerical value conversion circuit. The detection device converts the input signal into oscillation frequency through the first and the second voltage control oscillators, and the oscillation frequency is processed through amplification, subtraction and conversion, so as to judge if the direct current micro voltage or micro current is input.
Description
Technical field
The utility model relates to a kind of DC voltage/current pick-up unit, particularly relates to a kind of pick-up unit that can detect the DC current of the DC voltage of microvolt level or microampere order.
Background technology
At present, desire is measured a unknown voltage or electric current, and digital multimeter is undoubtedly a preferable selection, both can realize quick measurement by digital multimeter, and measurement result can visually see again.Yet because digital multimeter also can only be shown to 0.01 peace at 20 ampere-hours, thereby its precision is limited, only is suitable for measuring bigger curtage, and for the electric current of microampere order or the voltage of microvolt level, but is powerless.Except digital multimeter, comparer also is a good selection.But when using comparer, need to do benchmark with a known voltage or electric current, this just occurs deviation easily, thereby influence precision, especially, general comparer has only 0.01 volt precision at present, has the limited problem of precision equally, thereby is unsuitable for measuring the electric current of microampere order or the voltage of microvolt level equally with comparer.In addition, hall device also can be used for measuring unknown voltage or electric current, but because hall device can only measure milliampere, the millivolt level, does not accomplish microampere, microvolt level, thereby can't be used for measuring micro voltage or little electric current equally.Obviously, the detection technique to direct current micro voltage, little electric current is blank at present substantially.
The utility model content
The purpose of this utility model is to overcome the deficiency of prior art, a kind of direct current micro voltage/little current sensing means is provided, employing is converted into oscillation frequency with signal to be checked, process amplification again, the detection method that compares, converts, thereby judge whether direct current micro voltage or the input of little electric current are arranged, and then filled up the blank of direct current micro voltage/little current detection technology in the prior art.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of direct current micro voltage/little current sensing means comprises an oscillatory circuit, a digital signal amplifying circuit, a subtracter and a numerical value scale unit; This oscillatory circuit comprises two identical first voltage controlled oscillators of parameter and second voltage controlled oscillator, the input reception inspection signal output part or the ground connection of this first voltage controlled oscillator, the input grounding of second voltage controlled oscillator or reception inspection signal output part, the output of this first voltage controlled oscillator and second voltage controlled oscillator is connected with the input of digital signal amplifying circuit respectively; The output of this digital signal amplifying circuit is connected with the input of subtracter, and the output of subtracter connects the input of numerical value scale unit.
Described digital signal amplifying circuit comprises two first counter and second counters that parameter safety is identical; The input of first counter connects the output of described first voltage controlled oscillator, and the input of second counter connects the output of described second voltage controlled oscillator; The output of this first counter and second counter is connected with the input of described subtracter respectively.
Described oscillatory circuit, digital signal amplifying circuit, subtracter and numerical value scale unit are integrated on the control chip; The 6th pin of this control chip is the input end of described first voltage controlled oscillator, and the 6th pin of this control chip connects described signal output part to be checked; The 5th pin of this control chip is the input end of described second voltage controlled oscillator, the 5th pin ground connection of this control chip; The 7th pin of this control chip is the output terminal of described numerical value scale unit; The 8th pin of this control chip connects external power supply.
Further, also comprise first electric capacity, second electric capacity, first resistance and second resistance; First resistance is connected between the 6th pin and described signal output part to be checked of described control chip; First electric capacity and second resistance are connected in parallel between the 5th pin and described signal output part to be checked of described control chip; One end of second electric capacity is connected with described external power supply, the other end ground connection of second electric capacity; The 4th pin of described control chip is connected with the 5th pin of described control chip.
The 5th pin and the 6th pin of described control chip can be exchanged use.
The beneficial effects of the utility model are, owing to comprise oscillatory circuit, the digital signal amplifying circuit, subtracter, the numerical value scale unit, and oscillatory circuit comprises two identical first voltage controlled oscillators of parameter and second voltage controlled oscillator, the input reception inspection signal output part or the ground connection of first voltage controlled oscillator, the input grounding of second voltage controlled oscillator or reception inspection signal output part, the output of first voltage controlled oscillator and second voltage controlled oscillator connects the input of digital signal amplifying circuit respectively, the output of digital signal amplifying circuit connects the input of subtracter, the output of subtracter connects the numerical value scale unit, make win voltage controlled oscillator and second voltage controlled oscillator input quantity can be converted into oscillation frequency respectively, and carry out processing and amplifying through the digital signal amplifying circuit successively, do subtraction through subtracter, through the processing that converts of numerical value scale unit, whether direct current micro voltage or the little electric current input of direct current are arranged thereby judged first voltage controlled oscillator.Obviously, the utility model has been filled up the blank of direct current micro voltage, little current detection technology in the prior art with simple, effective pick-up unit and detection method, and this is the raising of a matter for automatic control accuracy and mode.
Below in conjunction with drawings and Examples the utility model is described in further detail; But a kind of direct current micro voltage of the present utility model/little current sensing means is not limited to embodiment.
Description of drawings
Fig. 1 is an embodiment theory diagram of the present utility model;
Fig. 2 is an embodiment circuit connection diagram of the present utility model.
Embodiment
Embodiment sees also shown in Figure 1ly, and a kind of direct current micro voltage of the present utility model/little current sensing means comprises an oscillatory circuit, a digital signal amplifying circuit, a subtracter 5 and a numerical value scale unit 6; This oscillatory circuit comprises two identical first voltage controlled oscillators 1 of parameter and second voltage controlled oscillator 2; The digital signal amplifying circuit comprises two identical first counters 3 of parameter and second counter 4; The input reception inspection signal output part of this first voltage controlled oscillator 1, the input grounding of second voltage controlled oscillator 2 promptly connects 0 input end; The output of this first voltage controlled oscillator 1 and second voltage controlled oscillator 2 is corresponding respectively to be connected with the input of first counter 3 and second counter 4; The output of this first counter 3 and second counter 4 is connected with the input of subtracter 5 respectively, and the output of subtracter 5 connects the input of numerical value scale unit 6.
A kind of direct current micro voltage of the present utility model/little current sensing means, its specific implementation process is: first voltage controlled oscillator 1 and second voltage controlled oscillator 2 are handled input signal wherein respectively, the output oscillation frequency, and respectively this oscillation frequency is exported to first counter 3 and second counter 4; First counter 3 and second counter 4 carry out high-frequency count to the oscillation frequency of first voltage controlled oscillator 1 and second voltage controlled oscillator 2 respectively, export the vibration frequency of amplifying, and this oscillation frequency is exported to subtracter 5; 5 pairs of inputs of subtracter, two oscillation frequency are wherein done and are subtracted computing, obtain the oscillation frequency difference, and this oscillation frequency difference is exported to numerical value scale unit 6; The processing that converts of 6 pairs of these oscillation frequency differences of numerical value scale unit, the output digital signal; If this digital signal, is then confirmed first voltage controlled oscillator 1 greater than numerical value scale unit 6 pre-set threshold direct current micro voltage or the little electric current input of direct current are arranged; If this digital signal is less than or equal to numerical value scale unit 6 pre-set threshold, confirm that then first voltage controlled oscillator 1 does not have direct current micro voltage or the little electric current input of direct current.
A kind of direct current micro voltage of the present utility model/little current sensing means, adopt first voltage controlled oscillator to change signal to be checked (the little electric current of direct current micro voltage or direct current) into oscillation frequency, and the input of second voltage controlled oscillator connect 0, the output oscillation frequency is as benchmark, do the difference computing with the oscillation frequency of first voltage controlled oscillator, both both errors can be deducted by subtracting computing, can find out both differences again by difference; Output terminal at oscillatory circuit connects digital signal amplification circuit, particularly connect two identical counters of parameter, can carry out high-frequency count to the vibration frequency of two voltage controlled oscillators respectively on the one hand, and amplify oscillation frequency indirectly, can improve the arithmetic speed of subtracter on the other hand; At the output termination numerical operation circuit of subtracter, can be used for then judging whether first voltage controlled oscillator has direct current micro voltage or the input of little electric current.
See also shown in Figure 2ly, the utility model is integrated in above-mentioned oscillatory circuit, digital signal amplifying circuit, subtracter and numerical value scale unit on the one control chip IC1; The 6th pin of this control chip IC1 is the input end of described first voltage controlled oscillator 1, and the 6th pin of this control chip IC1 connects described signal output part to be checked; The 5th pin of this control chip IC1 is the input end of described second voltage controlled oscillator 2, the 5th pin ground connection GND of this control chip IC1; The 7th pin of this control chip IC1 is the output terminal of described numerical value scale unit; The 8th pin of this control chip IC1 meets external power supply VDD; Here, the 5th pin of control chip IC1 and the 6th pin can be exchanged use; When the 5th pin of control chip IC1 and the 6th pin are exchanged when using, the operation result that is integrated in the subtracter among the control chip IC1 is a negative value, and the numerical operation circuit that then is integrated among the control chip IC1 also has a function: the negative value of subtracter operation result is become absolute value.
Further, also comprise first capacitor C 1, second capacitor C 2, first resistance R 1 and second resistance R 2 among Fig. 2; First resistance R 1 is connected between the 6th pin and described signal output part to be checked of described control chip IC1; First capacitor C 1 and second resistance R 2 are connected in parallel between the 5th pin and described signal output part to be checked of described control chip IC1; One end of second capacitor C 2 is connected with described external power supply VDD, the other end ground connection GND of second capacitor C 2; The 4th pin of described control chip IC1 is connected with the 5th pin of described control chip.
Among Fig. 2, control chip IC1 is except connecting above-mentioned first capacitor C 1, second capacitor C 2, first resistance R 1 and second resistance R 2, its the 7th pin also connects the base stage of a triode BG1 by one the 3rd resistance R 3, its 8th pin also is connected with the end that the coil of a relay J K is imported; Wherein, the grounded emitter GND of triode BG1, the other end of the coil input of the collector connecting relay JK of triode BG1; Between the coil input end of relay J K, also be connected with one the 3rd capacitor C 3.This control chip IC1 in the course of the work, when having detected the input of the little electric current of direct current micro voltage or direct current, signal after this control chip IC1 will handle by its 7th pin is exported to triode BG1, make triode BG1 carry out processing and amplifying, disconnect or keep the state of disconnection with the sound contact that drives relay J K this signal.
The foregoing description only is used for further specifying a kind of direct current micro voltage of the present utility model/little current sensing means; but the utility model is not limited to embodiment; every foundation technical spirit of the present utility model all falls in the protection domain of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (5)
1. direct current micro voltage/little current sensing means is characterized in that: comprise an oscillatory circuit, a digital signal amplifying circuit, a subtracter and a numerical value scale unit; This oscillatory circuit comprises two identical first voltage controlled oscillators of parameter and second voltage controlled oscillator, the input reception inspection signal output part or the ground connection of this first voltage controlled oscillator, the input grounding of second voltage controlled oscillator or reception inspection signal output part, the output of this first voltage controlled oscillator and second voltage controlled oscillator is connected with the input of digital signal amplifying circuit respectively; The output of this digital signal amplifying circuit is connected with the input of subtracter, and the output of subtracter connects the input of numerical value scale unit.
2. direct current micro voltage according to claim 1/little current sensing means is characterized in that: described digital signal amplifying circuit comprises two first counter and second counters that parameter safety is identical; The input of first counter connects the output of described first voltage controlled oscillator, and the input of second counter connects the output of described second voltage controlled oscillator; The output of this first counter and second counter is connected with the input of described subtracter respectively.
3. direct current micro voltage according to claim 1 and 2/little current sensing means is characterized in that: described oscillatory circuit, digital signal amplifying circuit, subtracter and numerical value scale unit are integrated on the control chip; The 6th pin of this control chip is the input end of described first voltage controlled oscillator, and the 6th pin of this control chip connects described signal output part to be checked; The 5th pin of this control chip is the input end of described second voltage controlled oscillator, the 5th pin ground connection of this control chip; The 7th pin of this control chip is the output terminal of described numerical value scale unit; The 8th pin of this control chip connects external power supply.
4. direct current micro voltage according to claim 3/little current sensing means is characterized in that: further, also comprise first electric capacity, second electric capacity, first resistance and second resistance; First resistance is connected between the 6th pin and described signal output part to be checked of described control chip; First electric capacity and second resistance are connected in parallel between the 5th pin and described signal output part to be checked of described control chip; One end of second electric capacity is connected with described external power supply, the other end ground connection of second electric capacity; The 4th pin of described control chip is connected with the 5th pin of described control chip.
5. direct current micro voltage according to claim 3/little current sensing means is characterized in that: the 5th pin and the 6th pin of described control chip can be exchanged use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205948440U CN201859176U (en) | 2010-11-05 | 2010-11-05 | Direct current micro voltage/micro current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205948440U CN201859176U (en) | 2010-11-05 | 2010-11-05 | Direct current micro voltage/micro current detection device |
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| Publication Number | Publication Date |
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| CN201859176U true CN201859176U (en) | 2011-06-08 |
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| CN2010205948440U Expired - Lifetime CN201859176U (en) | 2010-11-05 | 2010-11-05 | Direct current micro voltage/micro current detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033157A (en) * | 2010-11-05 | 2011-04-27 | 漳州国绿太阳能科技有限公司 | Direct current micro voltage/micro current detection device and detection method thereof |
| CN102680776A (en) * | 2012-05-08 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wide-range logarithmic micro-current detection circuit |
| CN103604982A (en) * | 2013-11-19 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | PXI micro-current detection device |
-
2010
- 2010-11-05 CN CN2010205948440U patent/CN201859176U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033157A (en) * | 2010-11-05 | 2011-04-27 | 漳州国绿太阳能科技有限公司 | Direct current micro voltage/micro current detection device and detection method thereof |
| CN102033157B (en) * | 2010-11-05 | 2012-10-31 | 漳州国绿太阳能科技有限公司 | Direct current micro voltage/micro current detection device and detection method thereof |
| CN102680776A (en) * | 2012-05-08 | 2012-09-19 | 中国科学院空间科学与应用研究中心 | Wide-range logarithmic micro-current detection circuit |
| CN103604982A (en) * | 2013-11-19 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | PXI micro-current detection device |
| CN103604982B (en) * | 2013-11-19 | 2015-11-25 | 中国电子科技集团公司第四十一研究所 | PXI micro-current detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110608 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |