CN102590601A - Wide-range current monitoring device - Google Patents
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Abstract
The invention discloses a wide-range current monitoring device which is characterized by comprising a zoom sampling module, an A/D (Alternating/Direct) converting module and a signal processing module, wherein the zoom sampling module is connected in series in a current loop to be monitored and is provided with a voltage sampling end; a voltage value of the voltage sampling end is controlled and can jump at a certain multiplying power; the A/D converting module is connected with the voltage sampling end and is provided with a sampling digital end; the signal processing module is connected to the sampling digital end and is provided with a zoom signal wire for controlling the zoom sampling module and a monitoring output end for outputting final digital information; a ratio of a sampling voltage value of the voltage sampling end to a current in the current loop to be monitored keeps positive; and the signal processing module controls the voltage sampling value to vary according to the multiplying power, so that digital information obtained by the sampling digital end is located within a main element range of the A/D converting module. According to the scheme provided by the invention, a monitoring current range greatly exceeds a maximum current value capable of being characterized by the A/D converting module before the zooming. The wide-range current monitoring device has good applicability in a condition that the data width of the A/D converting module is limited, so that the wide-range current monitoring is realized with lower cost and higher reliability.
Description
Technical field
The present invention relates to a kind of supervising device that is applicable to the wide variety DC current.
Background technology
In the electronic equipment, usually need monitor in real time the DC current of a certain characteristic because the electric current of this characteristic has usually reflected the real-time change of a certain monitored subtend, such as temperature, highly, logical, the power of pressure, light, signal intensity or the like; So electric current all has unique sensor as sampling equipment, makes monitored variable quantity be converted into the electric current with correlativity and take a sample, is treated to digital signal again and analyzes and in order to make a strategic decision in order to reading.Inevitably, to many continually varying monitoring subtend values, its monitoring output must need analog to digital (A/D) change-over circuit to obtain the net result of digital value.
Its current value of object that above-mentioned current monitoring device is monitored may have bigger variation range; And the complexity of A/D change-over circuit and cost increase along with the lifting of resolution, total element; And; The data transmission figure place of when resolution promotes with total element, bringing also increases thereupon, has so increased the cost of peripheral circuit more.When adopting the monitoring data transmission output of less byte, its cost can be controlled well, and correspondingly peripheral circuit does not need very complicacy, but its monitor current is range limited; On the other hand; If need satisfy the big electric current variation range that this monitored object produces, and adopt the A/D change-over circuit of high resolving power and total element, adopt more byte position to communicate simultaneously; Must bring increasing substantially of cost, the complexity of simultaneity factor also increases thereupon.
Summary of the invention
Be difficult to satisfy simultaneously the difficulty of hardware cost and electric current vary within wide limits to above current monitoring circuit, the present invention proposes a kind of current monitoring circuit of wide region, and its technical scheme is following:
Wide region current monitoring device, it comprises:
One becomes the sampling module, is series in the monitored current return, and having that its magnitude of voltage is controlled can be by the voltage sample end of a certain multiplying power saltus step;
One A/D modular converter connects said voltage sample end through filtering circuit, and has and export the sampled, digital end of switching signal; And
One signal processing module is connected in said sampled, digital end, has change times signal wire that is communicated with and controls said change sampling module and the monitoring output terminal of exporting final monitor current numerical information;
Wherein, the electric current in the sample voltage value of said voltage sample end and the said monitored current return keeps direct ratio; Said signal processing module detects the signal of said sampled, digital end in real time; Control said change sampling module through becoming a times signal wire; Said voltage sample end is changed by said multiplying power and export suitable said sample voltage value, to such an extent as to the numerical information that said sampled, digital end obtains is positioned at total elemental range of said A/D modular converter all the time.
As some preferred persons of present technique scheme, can aspect as follows, have improvement:
In one preferred embodiment, the controlled step of said signal processing module comprises the following person who alternately carries out:
1) overflow the detection step: with the signal of said sampled, digital end simultaneously with a upper threshold value and threshold once, press its result:
A. if be higher than said upper threshold value, then control said voltage sample value once by said multiplying power reduction;
B. if be lower than said lower threshold value, then control said voltage sample value once by said multiplying power amplification;
If not said two devices C., then said voltage sample value is constant;
2) conversion output step: the signal of said monitoring output terminal is once exported with respect to the multiplying power variation contrary operation of said A, B or C step again;
Wherein, said upper threshold value and lower threshold value all are positioned at total elemental range of said A/D modular converter, and upper threshold value is greater than the product of lower threshold value and said multiplying power.
On the last technical scheme basis, in the preferred embodiment, said change sampling module comprises the sampling resistor array that the resistance of switched conductive is provided with by said multiplying power.
On the last technical scheme basis, in the preferred embodiment, said sampling resistor array parallel is provided with; Said change times signal wire is corresponding one by one with the switch that the said sampling resistor of control inserts the loop.
On the last technical scheme basis, in the preferred embodiment, it is the said sampling resistor that multiplying power is arranged step by step by resistance with 8 that said change sampling module has 4; Said sampled, digital end is 8 bit parallel data lines, and said monitoring output terminal is 17 bit parallel data lines.
On the last technical scheme basis, in the preferred embodiment, said conversion output step comprises that the effective most-significant byte signal to said monitoring output terminal is shifted, and comprising:
1) if the said A step of executed then moves to left 3;
2) if the said B step of executed then moves to right 3;
After accomplishing above-mentioned displacement, not displacement person's signal output zero setting.
On the basis of above-mentioned preferred version, said signal processing module comprises that said overflowing an initialization step, this initialization step set said change sampling module before detecting step, to such an extent as to said voltage sample value is a lowest under the current monitored electric current.
In one preferred embodiment, said signal processing module comprises a digital signal processor.
In one preferred embodiment, said signal processing module and said A/D modular converter have the clock signal synchronous end.
The beneficial effect that the present invention brings is:
1. the final monitor current numerical information that obtains at the monitoring output terminal; Its scope of monitored electric current that can characterize is very big; Well beyond becoming the lowest high-current value that doubly preceding A/D modular converter can characterize; This has good applicability under A/D modular converter data width condition of limited, realized the current monitoring of wide region with lower cost, complexity and higher reliability.
2. adopt to go up the mode of lower threshold value, the change of signal processing module is doubly adjusted had hysteresis, especially upper threshold value and lower threshold value branch are taken leave of total element with null value has obvious distance, make that to become times hysteresis of adjusting more obvious, and it is controlled that lag performance becomes; Avoided the frequent switching of resistance gear.Make the digital signal of monitoring output terminal more stable easily.
3. the change sampling module of electric resistance array makes the sample voltage value change show intuitively and simple, and craft precision is controlled easily;
4. electric resistance array adopts and to insert side by side and become mode that times signal wire independently control and have very fast response speed and simple circuit.
5. have DSP, multiplying power convert resistance array, the parallel scheme that becomes times signal wire is specially adapted to the photocurrent monitoring in the optical communication, has faster response speed, process consistency and smaller volume preferably.
Description of drawings
Embodiment is described further the present invention below in conjunction with accompanying drawing:
Fig. 1 is the schematic block diagram of the embodiment of the invention one;
Fig. 2 is the circuit diagram of the embodiment of the invention two;
Fig. 3 is a process flow diagram embodiment illustrated in fig. 2.
Embodiment
Embodiment one:
Fig. 1 is the schematic block diagram of the embodiment of the invention one; Become sampling module 20, be series in the monitored current return, promptly monitored electric current I rop has voltage sample end 11 through becoming sampling mould fast 20 to ground with the Irop junction, and the sampled voltage that obtains on this voltage sample end 11 is proportional to Irop; But and the voltage controlled change on the voltage sample end 11, according to an identical multiplying power A saltus step step by step.
A/D modular converter 40 is connected to voltage sample end 11 through filtering circuit 30, and has and export the sampled, digital end 41 of switching signal; This sampled, digital end 41 is that the analog voltage that voltage sample end 11 obtains is converted into the sequential value that changes in the data area shown in A/D modular converter 40 total elements, is connected to a signal processing module 50 through sampled, digital end 41 again.
Signal processing module 50 has a monitoring output terminal 51, is used to export the digital signal that total system finally obtains.This signal processing module 50 also has one and becomes times signal wire 52 connection change sampling modules 20.Its role is to: the signal of 50 pairs of sampled, digital ends 41 of signal processing module detects in real time, because total element of A/D modular converter 40 fixes, so the numerical upper limits of this sampled, digital end 41 is confirmed; If but on this basis; Irop increases; Its ratio has exceeded total elemental range of A/D modular converter 40; Then signal processing module 50 becomes sampling module 20 through becoming 52 controls of times signal wire, makes the magnitude of voltage reduction of voltage sample end 11 or enlarges multiplying power A, is positioned at total elemental range of A/D modular converter 40 until the numerical information of sampled, digital end 41; So; Monitoring the final monitor current numerical information that output terminal 51 obtains; Its scope of monitored electric current I rop that can characterize is very big; Well beyond becoming doubly preceding 40 lowest high-current values that can characterize of A/D modular converter, this has good applicability under A/D modular converter 40 data width condition of limited, realized the current monitoring of wide region with lower cost, complexity and higher reliability.
Embodiment two:
Like Fig. 2, the circuit diagram of the embodiment of the invention two; Fig. 3 is a process flow diagram embodiment illustrated in fig. 2.Explain in conjunction with this two figure:
Become the electric resistance array R0 to R3 that switched conductive is arranged in the sampling module 20, resistance is set up in parallel by said multiplying power, and this routine moderate multiplying factor is set to 8, and promptly the resistance relation is R3=8R2=64R1=512R0; Accordingly, it is corresponding one by one with the K switch 0 to K3 of electric resistance array to become times signal wire 52, has 4, is communicated with respectively and is controlled by signal processing module 50.
The sampled, digital end of A/D modular converter 40 is 41 to be 8 bit parallel data lines, and (the monitoring output terminal of the signal processing module 50 that DSP realizes is 17 bit parallel data lines with a digital signal processor; Simultaneously, signal processing module 50 has clock signal synchronous end CLK and reset terminal RST with A/D modular converter 40.
During total system work; Signal processing module 50 at first has an initialization step 1; The K0 that this initialization step becomes in the sampling module 20 is connected; And K1-K3 ends, so the minimum R0 of resistance inserts the Irop loop, to such an extent as to the voltage sample value of voltage sample end 11 is a lowest under the current monitored electric current in the voltage sample step 2.
Get into analog to digital conversion step 3 immediately, obtain effective value, transform, obtain the instant data of one 8 bit parallel from sampled, digital end 41 through A/D modular converter 40 from the voltage sample value process R5 of voltage sample end 11 and the filtering circuit of C1 formation.
Immediately, signal processing module 50 gets into one and overflows and detect step 4, this step with the instant data of sampled, digital end 11 simultaneously with a upper threshold value and threshold once, upper threshold value is made as 240 in this example, lower threshold value is made as 20.
Signal processing module 50 is by its comparative result: if be lower than said upper threshold value 20, then control the voltage sample value and enlarge once by multiplying power 8; In this example, realize this expansion be before K0 is turn-offed on the basis of state, get final product and open K1; Get into next conversion output step 5 immediately.
The conversion output step of this moment because enlarged multiplying power 8, so need the value of contrary operation monitoring output terminal 51, is promptly reduced multiplying power 8, exports, and so, all be in a sampling period, to accomplish, obtain a circulation.
Another kind of situation, when comparative result is higher than upper threshold value 240 in circulation, signal processing module 50 control voltage sample values by multiplying power 8 reductions once, for example current state is that K1 opens, and then K1 is turn-offed K0 and opens and can realize this reduction; Simultaneously, because reduced multiplying power 8, so need the value of contrary operation monitoring output terminal 51, promptly enlarging multiplying power 8 and export, so also is in a sampling period, to accomplish.
It is thus clear that; When Irop constantly changed, after few sampling period, the monitoring output terminal can obtain characterizing the digital watch indicating value of Irop eventually; And the sampled, digital end 41 of A/D modular converter 40 changes in its total element 256 all the time, in the value that 8 bit data can be represented, works.
In addition, doubly operate the very succinct effective and efficient manner of employing in the reverse change of signal processing module 50 its monitoring output terminals 51: shifting function, if need to enlarge 8 times, then with 3 of 8 original valid data lts; If need 8 times of reductions, be 3 of valid data gts then with original 8.After accomplishing displacement, displacement person's signal output zero setting can not obtain 17 bit data, and the range of current that its 17 bit data is characterized far surpasses 41 electric currents that can characterize of 8 sampled, digital ends.On the other hand, when electrorheological gets enough hour, can be returned to original higher resolution again.
It is thus clear that the change sampling module 20 of electric resistance array makes the sample voltage value change show intuitively and simple, craft precision is controlled easily; And electric resistance array adopts the modes that insert side by side and become the 52 independent controls of times signal wire to have very fast response speed and simple circuit; The mode of lower threshold value in the employing can make the change of signal processing module doubly adjust and have hysteresis, and especially upper threshold value and lower threshold value branch are taken leave of total element and null value has obvious distance, make that the hysteresis that becomes doubly adjustment is more obvious, and it is controlled that lag performance becomes; Avoided the frequent switching of resistance gear.Make the digital signal of monitoring output terminal 51 more stable easily.Simultaneously, this programme detects step and conversion output step with the synchronous clock periodic duty in overflowing, and has fast speeds and higher precision, and in the application of laser optical power detection, seeming very is suitable for, and is easy to be integrated into small and exquisite reliable monitoring module.
The above is merely preferred embodiment of the present invention, so can not limit the scope that the present invention implements according to this, the equivalence of promptly doing according to claim of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (9)
1. wide region current monitoring device, it is characterized in that: it comprises:
One becomes the sampling module, is series in the monitored current return, and having that its magnitude of voltage is controlled can be by the voltage sample end of a certain multiplying power saltus step;
One A/D modular converter connects said voltage sample end through filtering circuit, and has and export the sampled, digital end of switching signal; And
One signal processing module is connected in said sampled, digital end, has change times signal wire that is communicated with and controls said change sampling module and the monitoring output terminal of exporting final monitor current numerical information;
Wherein, the electric current in the sample voltage value of said voltage sample end and the said monitored current return keeps direct ratio; Said signal processing module detects the signal of said sampled, digital end in real time; Control said change sampling module through becoming a times signal wire; Said voltage sample end is changed by said multiplying power and export suitable said sample voltage value, to such an extent as to the numerical information that said sampled, digital end obtains is positioned at total elemental range of said A/D modular converter all the time.
2. according to the said wide region current monitoring of claim 1 device, it is characterized in that: the controlled step of said signal processing module comprises the following person who alternately carries out:
1) overflow the detection step: with the signal of said sampled, digital end simultaneously with a upper threshold value and threshold once, press its result:
A. if be higher than said upper threshold value, then control said voltage sample value once by said multiplying power reduction;
B. if be lower than said lower threshold value, then control said voltage sample value once by said multiplying power amplification;
If not said two devices C., then said voltage sample value is constant;
2) conversion output step: the signal of said monitoring output terminal is once exported with respect to the multiplying power variation contrary operation of said A, B or C step again;
Wherein, said upper threshold value and lower threshold value all are positioned at total elemental range of said A/D modular converter, and upper threshold value is greater than the product of lower threshold value and said multiplying power.
3. according to the said wide region current monitoring of claim 2 device, it is characterized in that: said change sampling module comprises the sampling resistor array that the resistance of switched conductive is provided with by said multiplying power.
4. according to the said wide region current monitoring of claim 3 device, it is characterized in that: said sampling resistor array parallel is provided with; Said change times signal wire is corresponding one by one with the switch that the said sampling resistor of control inserts the loop.
5. according to the said wide region current monitoring of claim 4 device, it is characterized in that: it is the said sampling resistor that multiplying power is arranged step by step by resistance with 8 that said change sampling module has 4; Said sampled, digital end is 8 bit parallel data lines, and said monitoring output terminal is 17 bit parallel data lines.
6. according to the said wide region current monitoring of claim 5 device, it is characterized in that: said conversion output step comprises that the effective most-significant byte signal to said monitoring output terminal is shifted, and comprising:
1) if the said A step of executed then moves to left 3;
2) if the said B step of executed then moves to right 3;
After accomplishing above-mentioned displacement, not displacement person's signal output zero setting.
7. according to each said wide region current monitoring device in the claim 2 to 7; It is characterized in that: said signal processing module comprises an initialization step before in the said detection step of overflowing; This initialization step is set said change sampling module, to such an extent as to said voltage sample value is a lowest under the current monitored electric current.
8. according to the said wide region current monitoring of claim 1 device, it is characterized in that: said signal processing module comprises a digital signal processor.
9. according to the said wide region current monitoring of claim 1 device, it is characterized in that: said signal processing module and said A/D modular converter have the clock signal synchronous end.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868949A (en) * | 2015-04-08 | 2015-08-26 | 厦门优迅高速芯片有限公司 | Photoelectric current monitoring circuit applied to trans-impedance amplification circuit |
| CN106787717A (en) * | 2016-12-12 | 2017-05-31 | 深圳市派捷电子科技有限公司 | A kind of four line programmable power supply circuits |
| CN107231190A (en) * | 2017-07-21 | 2017-10-03 | 东莞铭普光磁股份有限公司 | A kind of optical power monitoring circuit and method |
| CN108111230A (en) * | 2018-01-19 | 2018-06-01 | 厦门优迅高速芯片有限公司 | A kind of circuit of multiplexed optical communications light-receiving component MON pins |
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| DE3303200A1 (en) * | 1983-02-01 | 1984-08-02 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Direct-current amplifier circuit arrangement with negative feedback |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104868949A (en) * | 2015-04-08 | 2015-08-26 | 厦门优迅高速芯片有限公司 | Photoelectric current monitoring circuit applied to trans-impedance amplification circuit |
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| CN106787717A (en) * | 2016-12-12 | 2017-05-31 | 深圳市派捷电子科技有限公司 | A kind of four line programmable power supply circuits |
| CN107231190A (en) * | 2017-07-21 | 2017-10-03 | 东莞铭普光磁股份有限公司 | A kind of optical power monitoring circuit and method |
| CN108111230A (en) * | 2018-01-19 | 2018-06-01 | 厦门优迅高速芯片有限公司 | A kind of circuit of multiplexed optical communications light-receiving component MON pins |
| CN108111230B (en) * | 2018-01-19 | 2023-07-21 | 厦门优迅高速芯片有限公司 | Circuit for multiplexing MON pin of optical communication optical receiving assembly |
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Application publication date: 20120718 |