CN101944740B - Multichannel direct current sharing method and device - Google Patents
Multichannel direct current sharing method and device Download PDFInfo
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- CN101944740B CN101944740B CN 201010285874 CN201010285874A CN101944740B CN 101944740 B CN101944740 B CN 101944740B CN 201010285874 CN201010285874 CN 201010285874 CN 201010285874 A CN201010285874 A CN 201010285874A CN 101944740 B CN101944740 B CN 101944740B
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Abstract
The invention relates to a multichannel direct current sharing method, comprising the following steps: acquiring driving current values of multiple channels; comparing the current values of multiple channels and determining the channel with the highest driving current value and the channel with the lowest driving current value; and reducing the drive waveform of the channel with the highest driving current value and increasing the drive waveform of the channel with the lowest driving current value. The invention also relates to a multichannel direct current sharing device. The method and the device of the invention have the following beneficial effects: higher efficiency, ideal current sharing effect and lower cost.
Description
Technical field
The present invention relates to the control field of power supply direct current, more particularly, relate to a kind of Multichannel direct current sharing and device.
Background technology
Its multichannel (or multichannel) output is made in the situation of current-sharing needing power supply, for example, when driving the multi-way LED lamp string, the method that usually adopts in the prior art comprises AC/DC step-down constant current, except an external AC/DC constant voltage constant current power, without any other unnecessary electronic component.First with a plurality of LED series connection, then with the multi-string LED output that accesses AC/DC in parallel.The advantage of sort circuit is that circuit is very simple, efficient very high (efficient that is equal to AC power supplies).Shortcoming is the constant current poor effect, and the LED light decay is very large, has a strong impact on its useful life; Directly by the AC/DC constant-current supply 220V civil power of input to be transformed to constant-current supply about 50V to a kind of improvement of foregoing circuit, multi-string LED is connected in parallel, then seal in a resistance at every string LED, with flat permanent in the different current error that causes of the Vf value of LED, its circuit is simple, cost is very low, but the current-sharing weak effect, power-efficient is low.In addition, another kind of common technical scheme is by the AC/DC constant voltage source 220V civil power of input to be transformed to DC power supply about 50V first, then seal in a DC constant-current circuit on every string LED lamp string, thereby the circuit that guarantees the every LED of string lamp string is invariable all the time.The constant current accuracy of sort circuit is higher, but its circuit is numerous and diverse, failure rate is high, efficient is lower; Replenish as a kind of of foregoing circuit, also can connect a power supply by every string LED.Such constant current is effective, and single string design is disposed comparatively flexibly, but also just because of its modular structure, power is done smallerly, so efficient is lower, its cost is higher.
Summary of the invention
The technical problem to be solved in the present invention is, for the defective that above-mentioned efficient is low, the current-sharing effect is undesirable, cost is higher of prior art, provides a kind of efficient is high, the current-sharing effect is comparatively desirable, cost is low Multichannel direct current sharing and device.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of method of multi-channel DC current-sharing, comprise the steps:
A) obtain the driving current value of a plurality of passages;
B) current value of more above-mentioned a plurality of passages is determined the passage of its driving current value maximum and the passage of minimum;
C) reduce described maximum drive current the value passage drive waveforms and increase the drive waveforms of the passage of described minimum drive current value;
D) return steps A).
In Multichannel direct current sharing of the present invention, described steps A) further comprise:
A1) obtain a passage by the sampling and analog-to-digital conversion after instantaneous driving current value;
A2) whether judgement reaches the first set point to the reading times of the instantaneous driving current value of this passage, in this way execution in step A3); Otherwise, return steps A 1);
A3) described the first set point instantaneous driving current value is average, obtain the driving current value of this passage.
In Multichannel direct current sharing of the present invention, described steps A) also comprise the steps:
A4) whether the judgement port number of obtaining driving current value reaches the second set point, in this way, and execution in step B); Otherwise, return steps A 1) and obtain the driving current value of next passage.
In Multichannel direct current sharing of the present invention, described step B) by the current value of each passage relatively one by one, determines the passage that described driving current value is minimum and maximum in.
In Multichannel direct current sharing of the present invention, described step C) further comprise in:
C1) the drive waveforms duty ratio with the passage of described maximum drive current value reduces;
C2) the drive waveforms duty ratio with the passage of described minimum drive current value strengthens.
In Multichannel direct current sharing of the present invention, described step C1) and step C2) in reduce respectively and strengthen a duty ratio of setting unit.
The present invention has also disclosed a kind of multi-channel DC current equalizer, comprise that the driving current value be used to the driving current value that obtains a plurality of passages obtains module, be used for the current value of more above-mentioned a plurality of passages and determine the passage of its driving current value maximum and the comparison module of minimum passage and being used for reduce described maximum drive current the value passage drive waveforms and increase the adjustment module of drive waveforms of the passage of described minimum drive current value.
In multi-channel DC current equalizer of the present invention, described driving current value obtains module and further comprises be used to obtaining the transient current value of instantaneous driving current value of a passage after by sampling and analog-to-digital conversion and obtain the unit, be used for whether judgement reaches the first set point to the reading times of the instantaneous driving current value of this passage the first set point judging unit, be used for the driving current value computing unit whether port number that judgement obtains driving current value reaches the second set point judging unit of the second set point and be used for will described the first set point instantaneous driving current value on average obtaining the driving current value of this passage.
In multi-channel DC current equalizer of the present invention, described comparison module comprises the current value comparing unit of determining maximum and minimum value place passage in a plurality of driving current value.
In multi-channel DC current equalizer of the present invention, described adjustment module comprises for what the drive waveforms duty ratio with the passage of described maximum drive current value reduced and reduces the unit and be used for the increase unit that the drive waveforms duty ratio with the passage of described minimum drive current value increases.
Implement Multichannel direct current sharing of the present invention and device, has following beneficial effect: owing to the driving current value that obtains in a plurality of passages, and regulate the wherein passage of maximum and minimum value, the drive current in above-mentioned a plurality of passage is reached unanimity in dynamically; And owing to adopt same control device to the drive waveforms control of a plurality of passages, so its efficient is higher, the current-sharing effect is comparatively desirable, cost is lower.
Description of drawings
Fig. 1 is method flow diagram among Multichannel direct current sharing of the present invention and the device embodiment;
Fig. 2 is the structural representation that installs among the described embodiment;
Fig. 3 is the circuit theory diagrams that install among the described embodiment.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, in Multichannel direct current sharing of the present invention and device embodiment, realize that the method for multi-channel DC current-sharing comprises the steps:
Step S11 obtains the instantaneous driving current value of a passage: in this step, (be passage, LED lamp string by being serially connected in load, referring to Fig. 3) on sampling resistor, obtain the instantaneous driving current value on this passage, at this moment, this driving current value is an analog quantity, need to be by analog to digital conversion, make it be converted to digital signal, so that processing afterwards; After being converted into digital signal, just calculation obtains the instantaneous driving current value of this passage, so the instantaneous driving current value described in this step is digital signal.After the instantaneous driving current value that obtains this numeral, store this value, be convenient to subsequent treatment.In the present embodiment, above-mentioned passage is the controlled switch of a lamp string with a plurality of LED, series connection with it and is connected to sampling resistor between above-mentioned controlled switch and the ground, when above-mentioned controlled switch conducting, electric current by power supply successively by LED lamp string, controlled switch, sampling resistor, return power supply, so so that above-mentioned LED lamp string is luminous and form voltage at above-mentioned sampling resistor, because the sampling resistor value is known, so can obtain the instantaneous driving current value on this passage.
Does this passage value number of times of step S12 reach the first set point? in this step, after the instantaneous driving current value that obtains a subchannel and storage, counter adds one, and judge that whether Counter Value is greater than the first set point, as greater than the first set point, counter O reset, and execution in step S13; Otherwise, return step S11.
Step S13 on average obtains the first set point instantaneous driving current value the driving current value of this passage: in this step, owing to passed through the collection (establishing M is the first set point) of M instantaneous drive current through above-mentioned steps, so store M instantaneous driving current value, maximum and minimum value in above-mentioned M the instantaneous driving current value are cast out, with remaining instantaneous driving current value addition, and divided by M-2, obtain its mean value and storage, this mean value is exactly the driving current value of this passage.Why passing through multi collect, remove maximum and minimum value and get its mean value as the channel current value afterwards again, is in order to avoid instantaneous disturbance, so that this channels drive current value is more accurate.
Does the port number that step S14 obtains driving current value reach the second set point? in the present embodiment, comprise a plurality of passages (being above-mentioned LED string or load), be made as N, step S11-S13 obtains the mean value of a passage, this step is exactly that the driving current value that judges whether all passages all obtains, judges namely whether acquired channels drive current value has N; In this way, execution in step S16; Otherwise, execution in step S15.
Step S15 begins next channel measurement: this step is to have obtained the driving current value of a passage in this is measured, but not yet obtains in the situation of driving current value of all passages, begins to carry out the measurement of the driving current value of next passage.
Step S16 determines maximum passage and minimum value passage in the second set point driving current value: in this step, obtained the driving current value of all passages, one of maximum in these values and minimum one be need to find out, and then the passage of maximum drive current value and the passage with minimum drive current value determined to have.In the present embodiment, by more above-mentioned current value one by one, utilize the current value comparison program to realize the maximum of above-mentioned drive current and searching of minimum value; In other embodiments, also can realize with other means the searching of above-mentioned drive current maximum and minimum value.
Step S17 reduces the drive waveforms duty ratio of above-mentioned maximum passage: after above-mentioned steps is found out the passage with maximum driving current value and had the passage of minimum drive current value, in this step, just need to regulate above-mentioned channels drive current value with maximum drive current value, so that its drive current diminishes; In the present embodiment, adopt the mode of passing through to reduce the duty ratio of the drive waveforms of controlled switch in this passage so that the ON time of its controlled switch is shorter, and then so that its drive current becomes lower, more approaching with the drive current of multi-channel.
Step S18 increases the drive waveforms duty ratio of above-mentioned minimum value passage: in this step, need to regulate above-mentioned channels drive current value with minimum drive current value, so that its drive current becomes large; In the present embodiment, adopt the mode of passing through to increase the duty ratio of the drive waveforms of controlled switch in this passage so that the ON time of its controlled switch is longer, and then so that its drive current becomes larger, more approaching with the drive current of multi-channel.After finishing this step, return step S11, begin the drive current current-sharing in next cycle.
In the present embodiment, the execution in step S17 of above-mentioned steps elder generation at execution in step S18, returns step S11 afterwards; In other embodiments, also can first execution in step S18, execution in step S17 returns step S11 afterwards again; In addition, in the present embodiment, respectively to set point of duty cycle adjustment of its drive waveforms, be 1/256 among above-mentioned steps S17 and the S18, but in other embodiments, this set point also can be other numerical value, for example 1%; Simultaneously, in other embodiments, the regulated quantity in the above-mentioned different step also can be set to respectively different numerical value, for example, drive waveforms duty ratio 10% that can Primary regulation maximum passage, and the amount of the drive waveforms duty ratio of Primary regulation minimum value passage is 5%.
Present embodiment also relates to a kind of multi-channel DC current equalizer, and as shown in Figure 2, multi-channel DC current equalizer 2 comprises that driving current value obtains module 21, comparison module 22 and adjustment module 23; Wherein, driving current value obtains the driving current value that module 21 is used for obtaining a plurality of passages; Comparison module 22 is used for the current value of more above-mentioned a plurality of passages and determines passage and the minimum passage of its driving current value maximum; Adjustment module 23 be used for reducing described maximum drive current the value passage drive waveforms and increase the drive waveforms of the passage of described minimum drive current value.In the present embodiment, further, driving current value obtains module 21 and comprises that the transient current value obtains unit 211, the first set point judging unit 212, the second set point judging unit 213 and driving current value computing unit 214.Wherein the transient current value obtains unit 211 for the instantaneous driving current value that obtains after a passage passes through sampling and analog-to-digital conversion; The first set point judging unit 212 is used for judging whether the reading times to the instantaneous driving current value of this passage reaches the first set point; Whether the second set point judging unit 213 reaches the second set point for the port number that judgement obtains driving current value; Driving current value computing unit 214 is used for described the first set point instantaneous driving current value is on average obtained the driving current value of this passage.In addition, comparison module 22 has comprised the current value comparing unit 221 that is used for determining a plurality of driving current value maximums and minimum value place passage; Adjustment module 23 has comprised then that the drive waveforms duty ratio of the passage that is used for having the maximum drive current value reduces reduces unit 231 and is used for having the increase unit 232 that the drive waveforms duty ratio of the passage of minimum drive current value increases.In the present embodiment, above-mentionedly reduce unit 231 and increase drive waveforms is all regulated in unit 232 according to identical setting step value duty ratio, in other embodiments, also can set and above-mentionedly reduce unit 231 and increase unit 232 has different step-by-step adjustment values.
Fig. 3 is the electrical schematic diagram of present embodiment, its Primary Component is the MCU that realizes Based Intelligent Control, the metal-oxide-semiconductor that 8 realization switch controls are arranged in addition, its operation principle roughly is as follows: switch on moment, MCU resets, all PWM output pins are all exported high level, so that 8 whole conductings of metal-oxide-semiconductor, form a voltage at resistance R s like this, and after carrying out integral filtering through resistance R a, capacitor C a, a produces pressure drop in capacitor C, and its pressure drop size is mainly flow through the electric current of Rs by resistance R s and Irs() determine, when all aisle resistance Rs were identical, its pressure drop was just determined by Irs; The A/D that delivers to MCU through the voltage of RC integral filtering detects pin, with the input analog signal conversion be digital signal, behind 8 passage Pollings, the size of current on each road is namely identified by MCU, and through after MCU compares, the pwm control signal duty ratio of the passage that the electric current of correspondence is large is turned down, and the pwm control signal duty ratio of the passage that the electric current of correspondence is little tunes up, by after repeatedly adjusting, the electric current on each road namely reaches dynamic and equates like this.
In Fig. 3, when circuit powers on, external circuit is given a reset signal, make the single-chip microcomputer electrification reset, program begins to carry out from address 0000H, and at the beginning, single-chip microcomputer carries out initialization with I/O mouth, timer (PWM), A/D, interruption etc., when particularly powering on the port of 8 road PWM is opened, can be collected 8 correct channel current signals to guarantee follow-up A/D sampling; Then the RAM that program is used carries out assignment as required; Then the analog signal of the 1st passage is carried out multi collect, and image data is gone its maximum, minimum value, ask the mean value of remainder data, to reduce its bursty interference; Adopting same procedure is digital signal with the analog signal conversion of rest channels; Then with the data of passage collection compare, the PWM pulsewidth that the data largest passages is corresponding reduces, the PWM pulsewidth that the data smallest passage is corresponding strengthens; Then gather most, compare most, namely, each passage electricity can be annotated and adjust to equally, so circulation can be adjusted the phenomenon that each channel current of causing because of a variety of causes differs in size.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (5)
1. the method for a multi-channel DC current-sharing is characterized in that, comprises the steps:
A) obtain the driving current value of a plurality of passages;
B) driving current value of more above-mentioned a plurality of passages is determined the passage of its driving current value maximum and the passage of minimum;
C) reduce described driving current value maximum passage the drive waveforms duty ratio and increase the drive waveforms duty ratio of the passage of described driving current value minimum;
D) return steps A);
Described steps A) further comprise:
A1) obtain a passage by the sampling and analog-to-digital conversion after instantaneous driving current value;
A2) whether judgement reaches the first set point to the reading times of the instantaneous driving current value of this passage, in this way execution in step A3); Otherwise, return steps A 1);
A3) described the first set point instantaneous driving current value is average, obtain the driving current value of this passage;
A4) whether the judgement port number of obtaining driving current value reaches the second set point, in this way, and execution in step B); Otherwise, return steps A 1) and obtain the driving current value of next passage.
2. the method for multi-channel DC current-sharing according to claim 1 is characterized in that, described step B) in by the driving current value of each passage relatively one by one, determine the passage that described driving current value is minimum and maximum.
3. the method for multi-channel DC current-sharing according to claim 2 is characterized in that, described step C) in further comprise:
C1) the drive waveforms duty ratio with the passage of described driving current value maximum reduces;
C2) the drive waveforms duty ratio with the passage of described driving current value minimum strengthens.
4. the method for multi-channel DC current-sharing according to claim 3 is characterized in that, described step C1) and step C2) in reduce respectively and strengthen a duty ratio of setting unit.
5. multi-channel DC current equalizer, it is characterized in that, comprise that the driving current value be used to the driving current value that obtains a plurality of passages obtains module, be used for the driving current value of more above-mentioned a plurality of passages and determine the passage of its driving current value maximum and the comparison module of minimum passage and being used for reduce described driving current value maximum passage the drive waveforms duty ratio and increase the adjustment module of drive waveforms duty ratio of the passage of described driving current value minimum;
Described driving current value obtains module and further comprises be used to obtaining the transient current value of instantaneous driving current value of a passage after by sampling and analog-to-digital conversion and obtain the unit, be used for whether judgement reaches the first set point to the reading times of the instantaneous driving current value of this passage the first set point judging unit, be used for the driving current value computing unit whether port number that judgement obtains driving current value reaches the second set point judging unit of the second set point and be used for will described the first set point instantaneous driving current value on average obtaining the driving current value of this passage;
Described comparison module comprises the current value comparing unit of determining maximum and minimum value place passage in a plurality of driving current value;
Described adjustment module comprises for what the drive waveforms duty ratio with the passage of described driving current value maximum reduced and reduces the unit and be used for the increase unit that the drive waveforms duty ratio with the passage of described driving current value minimum increases.
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| CN 201010285874 CN101944740B (en) | 2010-09-17 | 2010-09-17 | Multichannel direct current sharing method and device |
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| CN 201010285874 CN101944740B (en) | 2010-09-17 | 2010-09-17 | Multichannel direct current sharing method and device |
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| CN101944740A CN101944740A (en) | 2011-01-12 |
| CN101944740B true CN101944740B (en) | 2013-05-29 |
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| CN102447253B (en) * | 2011-12-30 | 2014-07-09 | 洛阳理工学院 | Direct current switching power supply parallel system current sharing control method and control device |
| CN103369765A (en) * | 2012-03-30 | 2013-10-23 | 艾默生过程控制流量技术有限公司 | An apparatus and a method for driving a light emitting diode |
| CN103095133A (en) * | 2013-01-04 | 2013-05-08 | 浙江上方光伏科技有限公司 | Current-sharing control system of double Boost converters connected in parallel |
| CN104267249A (en) * | 2014-10-09 | 2015-01-07 | 长智光电（四川）有限公司 | Device for measuring voltage difference between LED string lights |
| CN108764151B (en) * | 2018-05-29 | 2023-08-04 | 深圳市金流明光电技术有限公司 | Sitting posture detection device and method |
| CN114237145A (en) * | 2021-11-22 | 2022-03-25 | 浙江华章科技有限公司 | Gear box temperature and vibration analysis and maintenance system |
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| JP2008130513A (en) * | 2006-11-24 | 2008-06-05 | Matsushita Electric Works Ltd | Led lighting circuit and illumination fixture using it |
| CN101668363B (en) * | 2008-09-05 | 2014-01-29 | 艾默龙电子科技（嘉兴）有限公司 | High-efficiency drive control method for LED |
| JP5289084B2 (en) * | 2009-02-05 | 2013-09-11 | 三菱電機株式会社 | Power supply circuit and lighting device |
| CN101702849B (en) * | 2009-11-12 | 2012-12-12 | 英飞特电子（杭州）股份有限公司 | Multi-path PWM chopped wave current sharing circuit for LED driver |
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