CN103698594A - Detection range-adjustable current detection circuit and method - Google Patents

Detection range-adjustable current detection circuit and method Download PDF

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Publication number
CN103698594A
CN103698594A CN201310754088.1A CN201310754088A CN103698594A CN 103698594 A CN103698594 A CN 103698594A CN 201310754088 A CN201310754088 A CN 201310754088A CN 103698594 A CN103698594 A CN 103698594A
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China
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described
current
circuit
digital signal
signal processor
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CN201310754088.1A
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Chinese (zh)
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陈书生
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广东易事特电源股份有限公司
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Priority to CN201310754088.1A priority Critical patent/CN103698594A/en
Publication of CN103698594A publication Critical patent/CN103698594A/en

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Abstract

The invention discloses a detection range-adjustable current detection circuit and method. The circuit comprises a hall current sensor, a digital signal processor and a range adjusting circuit, wherein the hall current sensor is used for collecting detection current signals; the digital signal processor is used for judging the current interval where the values of the detection current signals are positioned; the range adjusting circuit is used for adjusting the detection range of the detection current signals according to the judged current interval. According to the detection range-adjustable current detection circuit and method, the current detection precision of the current detection circuit can be improved.

Description

The adjustable current detection circuit of a kind of sensing range and method

Technical field

The present invention relates to signal detection technique field, relate in particular to the adjustable current detection circuit of a kind of sensing range for photovoltaic DC-to-AC converter and method.

Background technology

Photovoltaic DC-to-AC converter claims again feed regulator isolator, is a kind of power adjusting device being comprised of semiconductor devices, is mainly used in photovoltaic generating system, and the direct current energy that photovoltaic cell can be produced is transformed into AC energy.For photovoltaic DC-to-AC converter, the electric energy producing in one day due to photovoltaic cell changes, less while generally starting in the morning, then increase gradually, to noon, reach maximum, then reduce gradually, until other late because energy shortage shuts down, can see that the electric current that photovoltaic DC-to-AC converter collects is very large one day inner conversion scope.

As shown in Figure 1, the circuit of current detecting in the prior art and method, comprise Hall current sensor, resistor, modulate circuit and a digital signal processor.The testing process of the circuit of current detecting is: by Hall current sensor acquisition testing current signal, by a resistance, sensed current signal is transformed into detectable voltage signals, by modulate circuit, detectable voltage signals is being carried out to absolute value processing, and then by the detectable voltage signals after absolute value processing, be input to analog to digital conversion (AD) port of digital signal processor.

But, the electric current producing due to photovoltaic cell is very large one day inner conversion scope, the circuit of the current detecting of prior art and method, when photovoltaic output current smaller value, the larger problem of error that there will be detection, when photovoltaic output current higher value, detectable voltage signals may exceedance word signal processor AD port-threshold value, if the sensed current signal that current detection circuit gathers is inaccurate, can cause larger impact to the digital signal processor of current detection circuit, cause the precision of current detecting of current detection circuit not high.

Summary of the invention

The object of the invention is to propose the adjustable current detection circuit of a kind of sensing range and method, to improve the accuracy of detection of electric circuit inspection circuit.

The invention provides the adjustable current detection circuit of a kind of sensing range, described circuit comprises: Hall current sensor, digital signal processor and range regulation circuit, wherein,

Described Hall current sensor is for acquisition testing current signal;

Described digital signal processor is for judging between the Current Zone at value place of described sensed current signal;

Described range regulation circuit, for according between the described Current Zone of judging, regulates the sensing range of sensed current signal.

Optionally, described range regulation circuit comprises the first resistance unit and the second resistance unit, wherein, described the first resistance unit and described the second resistance unit are connected in parallel, described the first resistance unit comprises resistor, described the second resistance unit comprises a plurality of resistance subelements, and wherein described in each, resistance subelement is connected in parallel, and described resistance subelement is composed in series by resistor and switching device.

Optionally, described range regulation circuit, specifically for:

Between the described Current Zone of judging according to described digital signal processor, by described switching device, regulate resistor in described the second resistance unit to access the number of described current detection circuit.

Optionally, described range regulation circuit, also for being converted to detectable voltage signals by the described sensed current signal of described Hall current sensor collection.

Optionally, the first port of described digital signal processor is connected in the output terminal of described range regulation circuit, and the second port of described digital signal processor is connected in the control end of described the second resistance subelement.

Optionally, described current detection circuit also comprises: modulate circuit, the first port of described digital signal processor is connected in the output terminal of described range regulation circuit by described modulate circuit, described modulate circuit carries out absolute value processing for the detectable voltage signals that described range regulation circuit is exported, and processes by carrying out absolute value the first port that detectable voltage signals is afterwards sent to described digital signal processor.

Corresponding, the invention allows for the adjustable electric current detecting method of a kind of sensing range, described method comprises:

Acquisition testing current signal;

Judge between the Current Zone at value place of described sensed current signal;

According between the described Current Zone of judging, regulate the sensing range of sensed current signal.

Optionally, before described acquisition testing current signal, also comprise:

Set in advance between Current Zone;

According between described Current Zone, determine sampling resistor value corresponding between described Current Zone.

Optionally, between the described Current Zone that described basis is judged, regulate the sensing range of sensed current signal, comprising:

According between the described Current Zone of judging, sampling resistor value is adjusted to resistance value corresponding between described Current Zone.

The present invention proposes the adjustable current detection circuit of a kind of sensing range and method, by Hall current sensor acquisition testing current signal, by digital signal processor, judge between the Current Zone at value place of described sensed current signal, by range regulation circuit, can select different sampling resistor values according to different sensed current signal, and then the sensing range of adjusting sensed current signal, can either solve when photovoltaic output current smaller value, the larger problem of error detecting, can avoid again when photovoltaic output current higher value, the AD port-threshold value of detectable voltage signals exceedance word signal processor, improved the current detection accuracy of current detection circuit.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the current detection circuit of prior art;

Fig. 2 is the schematic diagram of the adjustable current detection circuit of sensing range that provides of first embodiment of the invention;

Fig. 3 is the realization flow figure of the adjustable electric current detecting method of sensing range that provides of second embodiment of the invention.

Embodiment

For the technical scheme of technical matters that the present invention is solved, employing and the technique effect that reaches clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content.

Embodiment mono-

Fig. 2 is the schematic diagram of the adjustable current detection circuit of sensing range that provides of first embodiment of the invention.The circuit that the embodiment of the present invention provides can be carried out the adjustable electric current detecting method of sensing range that any embodiment of the present invention provides.As shown in Figure 2, the circuit that the embodiment of the present invention provides comprises:

Hall current sensor 201.

In photovoltaic DC-to-AC converter, conventionally adopt Hall current sensor to gather photovoltaic output current signal, and output and the proportional sampling output current signal of photovoltaic output current signal, it is sensed current signal, Hall element for known models, the ratio value of its sampling output current signal and photovoltaic output current signal is certain, wherein, I pfor sampling photovoltaic output current signal, I sfor sampling output current signal, n is the ratio value of sampling output current signal and photovoltaic output current signal.

In the present embodiment, by Hall current sensor 201, gather the photovoltaic output current signal that photovoltaic cell produces, and through described Hall current sensor 201, described photovoltaic output current signal is converted to the sensed current signal proportional with described photovoltaic output signal, further, the described sensed current signal of described Hall current sensor 201 outputs, through described range regulation circuit 203, be converted to detectable voltage signals, further, described detectable voltage signals is transferred in described signal processor 202, wherein, characteristic due to described Hall current sensor 201, described sensed current signal and detectable voltage signals are AC signal.

Digital signal processor 202.

Digital signal processor (Digital Signal Processor, DSP) be a kind of microprocessor of uniqueness, it is with digital signal, to process the device of bulk information, its principle of work is to receive simulating signal, and simulating signal is converted to digital signal, again digital signal is modified, deletes, strengthens, analyzed and processes, digital signal processor has high travelling speed and powerful data-handling capacity.

In the present embodiment, can be interval by programming specified current flow in advance by digital signal processor 202, the sensing range of electric current, for example, can be expressed as [0, I between described Current Zone 1], [I 1, I 2] ..., [I n-1, I n], wherein, I 1, I 2..., I nfor the waypoint between described Current Zone, and 0<I 1<I 2< ... <I n, further, determine sampling resistor value corresponding between each Current Zone.

In the present embodiment, the first port of described digital signal processor 202 is connected in the output terminal of described range regulation circuit 203, the second port of described digital signal processor 202 is connected in the control end of described the second resistance subelement 2032, and wherein the second port number is specifically determined according to the quantity of the switching device of the second resistance unit.Described digital signal processor 202 is for judging between the Current Zone at value place of described sensed current signal, concrete deterministic process is: the first port of described digital signal processor 202 receives through the resistor in described range regulation circuit 203 the next detectable voltage signals of sensed current signal conversion, further, by default program, described detection voltage is resolved to the current signal with described sensed current signal with corresponding relation, and then judge between the Current Zone at described sensed current signal place, further, described digital signal processor 202 is according between the described Current Zone of judging, can to described range regulation circuit 203, send the instruction of the sensing range that regulates sensed current signal by the second port of described digital signal processor 202, wherein, the first port of described digital signal processor 202 is preferably the AD port of described digital signal processor 202.

Range regulation circuit 203.

In the present embodiment, described range regulation circuit 203, for according between the described Current Zone of judging, regulates the sensing range of sensed current signal.Preferably, described range regulation circuit 203 comprises the first resistance unit 2031 and the second resistance unit 2032, wherein, described the first resistance unit 2031 and described the second resistance unit 2032 are connected in parallel, described the first resistance unit 2031 comprises resistor, described the second resistance unit 2032 comprises a plurality of resistance subelements, and wherein described in each, resistance subelement is connected in parallel, and described resistance subelement is composed in series by resistor and switching device.

Preferably, described range regulation circuit 203, specifically for: between the described Current Zone of judging according to described digital signal processor 202, by described switching device, regulate resistor in described the second resistance unit 2032 to access the number of described current detection circuit.Wherein, described switching device is not limited to the electronic component that triode and field effect transistor etc. can play contactor effect.

Concrete, the second port that the control end of the second resistance unit 2032 of described range regulation circuit 203 receives described digital signal processor 202 sends the instruction of the sensing range that regulates sensed current signal, further, conducting by controlling switching device in described the second resistance unit 2032 with disconnect the number that regulates resistor in described the second resistance unit 2032 to access described current detection circuit, the adjusting of realization to the resistance of described the second resistance unit 2032, realize the adjusting to the resistance value of described range regulation circuit 203, and then the adjusting of realization to the sensing range of sensed current signal, wherein, the resistance value of described range regulation circuit 203 is the sampling resistor value of described current detection circuit, described sampling resistor value R xrepresent, wherein, R 1the resistance value that represents the first resistance unit 2031, R 2, R 3..., R nthe resistance value that represents resistance subelement described in each of the second resistance unit 2032.For example, if the value of sensed current signal is greater than the higher limit of current detection scope, described current detection circuit is adjusted to a sensing range, if the value of sensed current signal is less than the lower limit of current detection scope, described current detection circuit is adjusted to next sensing range.Preferably, for avoiding repeatedly regulating in the critical point of sensing range, certain stagnant poor △ I that whirls can be set.In addition, when photovoltaic DC-to-AC converter just starts, owing to cannot predicting the value of sensed current signal, first in described range regulation circuit, use less resistance value, the sensed current signal that obtains to be collected, and then between the Current Zone at value place of judgement sensed current signal, then according to electric current interval selection, access the sampling resistor value of described current detection circuit, and then regulate the sensing range of sensed current signal.

Compared with prior art, the current detection circuit that such scheme provides can be according to the difference of the value of sensed current signal, carry out the sampling resistor value of regulating current detection circuit, and then the dynamic adjustments of realization to the sensing range of sensed current signal, can either solve when photovoltaic output current smaller value, the larger problem of error detecting, can avoid again when photovoltaic output current higher value, the AD port-threshold value of detectable voltage signals exceedance word signal processor, has improved the current detection accuracy of current detection circuit.

Preferably, described range regulation circuit 203, is also converted to detectable voltage signals for the described sensed current signal that described Hall current sensor 202 is gathered.This is because described digital signal processor 202 can only receiver voltage signal.So can, by the sensed current signal of Hall current sensor 202 outputs, sensed current signal be transformed into detectable voltage signals through a plurality of resistors in range regulation circuit 203.

Preferably, described current detection circuit also comprises: modulate circuit 204, the first port of described digital signal processor 202 is connected in the output terminal of described range regulation circuit 203 by described modulate circuit 204, described modulate circuit 204 carries out absolute value processing for the detectable voltage signals that described range regulation circuit 203 is exported, and processes by carrying out absolute value the first port that detectable voltage signals is afterwards sent to described digital signal processor 202.

Form with example describes the present embodiment below:

The waypoint setting in advance between Current Zone is three, is respectively I 1, I 2, I 3, and 0<I 1<I 2<I 3, form between three Current Zone and be respectively [0, I 1], [I 1, I 2], [I 2, I 3], and the stagnant poor △ I of being that whirls is set.Corresponding, described range regulation circuit 203 is set, wherein, described range regulation circuit 203 comprises the first resistance unit 2031 and the second resistance unit 2032, wherein, described the first resistance unit 2031 and described the second resistance unit 2032 are connected in parallel, described the first resistance unit 2031 comprises a resistor, described the second resistance unit 2032 comprises two resistance subelements, wherein described in each, resistance subelement is connected in parallel, and described resistance subelement is composed in series by a resistor and a triode.

When photovoltaic DC-to-AC converter just starts, owing to cannot predicting size of current, described digital signal processor 202 will send high level and control triode Q 1, Q 2conducting, due to Q 1, Q 2select signal pipe, conduction voltage drop is extremely low, negligible, R xfor sampling resistor value, i.e. R 1, R 2and R 3the total resistance of parallel connection of actual access current detection circuit, if establish R 1=R 2=R 3=R, R x=R/3.Hall current sensor 201 acquisition testing current signal I s, by three resistors in parallel in described range regulation circuit 203, described sensed current signal is converted to detectable voltage signals, the AD port of digital signal processor 202 receives described detectable voltage signals, and described detectable voltage signals is resolved to the current signal with described sensed current signal with certain relation through pre-set programs, further between the Current Zone at judgement described sensed current signal place, further, described digital signal processor 202 is according between the described Current Zone of judging, can to described range regulation circuit 203, send the instruction of the sensing range that regulates sensed current signal by the second port of described digital signal processor 202, the second port that the base stage of the triode of the second resistance unit 2032 of described range regulation circuit 203 receives described digital signal processor 202 sends the instruction of the sensing range that regulates sensed current signal, control the conducting of triode and the number of cut-off, thereby control the size of the sampling resistor value of current detection circuit, realize the sensing range that regulates sensed current signal.

Between table 1 Current Zone, the corresponding relation of triode state and sampling resistor value

Between Current Zone 0,I 1 I 1,I 2 I 2,I 3 Q 1And Q 2State Q 1、Q 2All cut-offs Q 1、Q 2End one Q 1、Q 2Full conducting Sampling resistor value R x R R/2 R/3

Concrete adjustment process is: establishing between the original Current Zone of working of current detection circuit is [I 1, I 2], if the value of sensed current signal is greater than I 2+ △ I, the triode Q in digital signal processor 202 range of control regulating circuits 203 1, Q 2conducting, will be adjusted to [I between the Current Zone of current detection circuit work 2, I 3], sampling resistor value R xbecome R/3; If the value of sensed current signal is less than I 1-△ I, the Q in digital signal processor 202 range of control regulating circuits 203 1, Q 2full cut-off, will be adjusted to [0, I between the Current Zone of current detection circuit work 1], sampling resistor value R xbecome R.Other adjustment processes similarly, do not repeat them here.

The adjustable current detection circuit of sensing range that the present embodiment provides, by Hall current sensor acquisition testing current signal, by digital signal processor, judge between the Current Zone at value place of described sensed current signal, by range regulation circuit, can select different sampling resistor values according to different sensed current signal, and then the sensing range of adjusting sensed current signal, can either solve when photovoltaic output current smaller value, the larger problem of error detecting, can avoid again when photovoltaic output current higher value, the AD port-threshold value of detectable voltage signals exceedance word signal processor, improved the current detection accuracy of current detection circuit.The very large situation of transformation range of the electric current that the current detection circuit that the present embodiment provides produces in a day for photovoltaic cell, has more practical significance, can be applied industrial.

Embodiment bis-

Fig. 3 is the realization flow figure that second embodiment of the invention provides the adjustable electric current detecting method of sensing range.The adjustable current detection circuit of sensing range that the present embodiment can be provided by any embodiment of the present invention is carried out.As shown in Figure 3, the method that the embodiment of the present invention provides comprises:

Step 301, acquisition testing current signal.

In embodiments of the present invention, can adopt Hall current sensor to carry out acquisition testing current signal.

Preferably, before described acquisition testing current signal, also comprise: set in advance between Current Zone; According between described Current Zone, determine sampling resistor value corresponding between described Current Zone.

Step 302, judges between the Current Zone at value place of described sensed current signal.

In embodiments of the present invention, can adopt digital signal processor to judge between the Current Zone at value place of described sensed current signal.

Step 303, according between the described Current Zone of judging, regulates the sensing range of sensed current signal.

In embodiments of the present invention, can adopt digital signal processor according between the described Current Zone of judging, regulate the sensing range of sensed current signal.

Preferably, between the described Current Zone that described basis is judged, regulate the sensing range of sensed current signal, comprising: according between the described Current Zone of judging, sampling resistor value is adjusted to resistance value corresponding between described Current Zone.

Concrete, if the value of sensed current signal is greater than the higher limit of current detection scope, be adjusted to a sensing range, if the value of sensed current signal is less than the lower limit of current detection scope, be adjusted to next sensing range, wherein, the sensing range of sensed current signal is by reflecting between described Current Zone.

The adjustable electric current detecting method of sensing range that the present embodiment provides, by acquisition testing current signal, judge between the Current Zone at value place of described sensed current signal, can select different sampling resistor values to regulate the sensing range of sensed current signal according to different sensed current signal, improve the current detection accuracy of current detection circuit.

One of ordinary skill in the art will appreciate that realizing in above-described embodiment method is to come the hardware that instruction is relevant to complete by program in whole or in part.

Note, foregoing is only preferred embodiment of the present invention.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.

Claims (9)

1. the adjustable current detection circuit of sensing range, is characterized in that, comprising: Hall current sensor, digital signal processor and range regulation circuit, wherein,
Described Hall current sensor is for acquisition testing current signal;
Described digital signal processor is for judging between the Current Zone at value place of described sensed current signal;
Described range regulation circuit, for according between the described Current Zone of judging, regulates the sensing range of sensed current signal.
2. circuit according to claim 1, it is characterized in that, described range regulation circuit comprises the first resistance unit and the second resistance unit, wherein, described the first resistance unit and described the second resistance unit are connected in parallel, and described the first resistance unit comprises resistor, and described the second resistance unit comprises a plurality of resistance subelements, wherein described in each, resistance subelement is connected in parallel, and described resistance subelement is composed in series by resistor and switching device.
3. circuit according to claim 1 and 2, is characterized in that, described range regulation circuit, specifically for:
Between the described Current Zone of judging according to described digital signal processor, by described switching device, regulate resistor in described the second resistance unit to access the number of described current detection circuit.
4. circuit according to claim 1, is characterized in that, described range regulation circuit, also for being converted to detectable voltage signals by the described sensed current signal of described Hall current sensor collection.
5. circuit according to claim 1, is characterized in that, the first port of described digital signal processor is connected in the output terminal of described range regulation circuit, and the second port of described digital signal processor is connected in the control end of described the second resistance subelement.
6. circuit according to claim 4, it is characterized in that, described current detection circuit also comprises: modulate circuit, the first port of described digital signal processor is connected in the output terminal of described range regulation circuit by described modulate circuit, described modulate circuit carries out absolute value processing for the detectable voltage signals that described range regulation circuit is exported, and processes by carrying out absolute value the first port that detectable voltage signals is afterwards sent to described digital signal processor.
7. the adjustable electric current detecting method of sensing range, is characterized in that, comprising:
Acquisition testing current signal;
Judge between the Current Zone at value place of described sensed current signal;
According between the described Current Zone of judging, regulate the sensing range of sensed current signal.
8. method according to claim 7, is characterized in that, before described acquisition testing current signal, also comprises:
Set in advance between Current Zone;
According between described Current Zone, determine sampling resistor value corresponding between described Current Zone.
9. according to the method described in claim 7 or 8, it is characterized in that, between the described Current Zone that described basis is judged, regulate the sensing range of sensed current signal, comprising:
According between the described Current Zone of judging, sampling resistor value is adjusted to resistance value corresponding between described Current Zone.
CN201310754088.1A 2013-12-31 2013-12-31 Detection range-adjustable current detection circuit and method CN103698594A (en)

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Cited By (5)

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CN104849542A (en) * 2015-06-12 2015-08-19 武汉精测电子技术股份有限公司 Current detection system and gear shift method therefor
CN105067867A (en) * 2015-08-17 2015-11-18 新疆希望电子有限公司 High-resolution current segment detection circuit and signal processing method thereof
CN106546806A (en) * 2015-09-21 2017-03-29 上海交通大学 Current sensing means with Gain Automatic regulation and telecommunications functions
WO2017133398A1 (en) * 2016-02-05 2017-08-10 广东欧珀移动通信有限公司 Terminal charging system, charging method, and power adapter
CN107167652A (en) * 2017-06-28 2017-09-15 亿信标准认证集团四川有限公司 Detection means on electronic product electric current

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CN202182911U (en) * 2011-07-27 2012-04-04 万洲电气集团有限公司 Automatic gain regulating current detection circuit of low voltage soft starter
CN202210118U (en) * 2011-07-15 2012-05-02 珠海中慧微电子有限公司 Current measurement circuit of wide-range electric energy meter
CN202649300U (en) * 2012-06-20 2013-01-02 江苏敦超电子科技有限公司 Current detecting device

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US20050206367A1 (en) * 2004-03-16 2005-09-22 Qualitau, Inc. Automatic range finder for electric current testing
CN2890080Y (en) * 2006-03-17 2007-04-18 北京中科信电子装备有限公司 Wide range current detection automatic gearshift device of ion implantation machine
CN202210118U (en) * 2011-07-15 2012-05-02 珠海中慧微电子有限公司 Current measurement circuit of wide-range electric energy meter
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CN104849542A (en) * 2015-06-12 2015-08-19 武汉精测电子技术股份有限公司 Current detection system and gear shift method therefor
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