CN104053288B - The non-isolated voltage-dropping type LED drive circuit of adaptation power supply - Google Patents
The non-isolated voltage-dropping type LED drive circuit of adaptation power supply Download PDFInfo
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Abstract
The present invention relates to a kind of non-isolated voltage-dropping type LED drive circuit and method of work of adaptation power supply, comprising: current rectifying and wave filtering circuit, control module, the feeder ear of this control module is connected with the output of rectification circuit by a resistance; Be provided with an adaptation power supply circuit in control module, this adaptation power supply circuit comprises microprocessor unit, pressure unit, some PN junctions of series connection, analog switch unit; The output of pressure unit is connected with the input of some PN junctions of series connection, and this output is as the voltage output end of adaptation power supply circuit; Be provided with node between each PN junction, each node is connected with each switch input terminal of analog switch unit respectively, and each output switching terminal of this analog switch unit is connected and by a grounding through resistance; Processor unit feeder ear obtains sampled voltage, and the control output end of this processor unit is connected with the control end of analog switch unit respectively.
Description
Technical field
The present invention relates to a kind of LED drive circuit, particularly relate to a kind of non-isolated voltage-dropping type LED drive circuit and method of work of adaptation power supply.
Background technology
Along with the technique of LED (Light-EmittingDiode) is updated, as lighting source, LED has presented that light efficiency is high, the life-span is long, response is fast and the feature such as environmental protection, has started to replace conventional light source at multiple lighting field.Although the power capacity of single LEDs reaches 10W, needing the illumination occasion of large area and high illumination, adopting the illumination scheme of single LEDs still can not meet the demands.For addressing this problem, often LED is adopted parallel connection, connecting is connected with the mode of series-parallel connection, by non-isolated voltage-dropping type LED drive circuit, LED is driven, the feeder ear of traditional non-isolated voltage-dropping type LED drive circuit is generally connected with energy-storage units, to gather the output voltage of energy-storage units.
Summary of the invention
The object of this invention is to provide a kind of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, the power pack of this LED drive circuit is optimized more, to adapt to peripheral voltage fluctuation, plays the effect of protection components and parts.
In order to solve the problems of the technologies described above, the invention provides a kind of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, comprise: current rectifying and wave filtering circuit, be provided with the control module of switching tube, the feeder ear of this control module is connected with the output of rectification circuit by a resistance; Be provided with an adaptation power supply circuit in described control module, this adaptation power supply circuit comprises microprocessor unit, forms pressure unit by first, second resistant series, the PN junction unit be made up of the PN junction of some series connection, analog switch unit; The output of described pressure unit is connected with the input of PN junction unit, and this output is as the voltage output end of described adaptation power supply circuit; Be provided with node between described each PN junction, each node is connected with each switch input terminal of described analog switch unit respectively, and each output switching terminal of this analog switch unit is connected, and by a grounding through resistance; Described microprocessor unit obtains sampled voltage from described feeder ear, the control output end of this microprocessor unit is connected with the control end of described analog switch unit respectively, namely, control described analog switch unit according to described sample voltage value open or close respective switch, to increase or to reduce the PN junction of series connection, stablize the output voltage of described adaptation power supply circuit.
In order to better optimized circuit, simplify components and parts, one end of switching tube in described control module is connected to the input of energy-storage units as voltage output end, the negative electrode of current sample end continued flow tube from energy-storage units of described control module obtains current sampling signal, by judging that the size of this current sampling signal is to control the disconnection of described switching tube, conducting or maintenance.
Further, described control module also comprises: comparing unit, this comparing unit comprises: be suitable for sampling resistor current sampling signal being transferred to voltage sampling signal, one end of this sampling resistor is connected with described current sample end, its other end ground connection, one end of described sampling resistor is also connected with hysteresis voltage compare subelement, this hysteresis voltage compare subelement is suitable for inputting described voltage sampling signal by its in-phase end, the output of described hysteresis voltage compare subelement is connected with the control end of described switching tube by an inverter, this hysteresis voltage compare subelement is suitable for the disconnection controlling described switching tube according to the change of sampled voltage, conducting or maintenance.
Further, described hysteresis voltage compare subelement comprises: comparator, the end of oppisite phase of this comparator inputs a reference voltage, described voltage sampling signal is by the in-phase end of input resistance access comparator, this in-phase end is also connected with one end of a feedback resistance, the output of described comparator is connected with one end of an output resistance, and the output of described comparator is also connected with the other end of described feedback resistance, and the other end of described output resistance is as the output of described hysteresis voltage compare subelement.
In order to solve the problems of the technologies described above, on the basis of technique scheme, present invention also offers a kind of method of work of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, comprise: described microprocessor unit is suitable for controlling described analog switch unit according to described sample voltage value and opens or close respective switch, to increase or to reduce the PN junction of series connection, stablize the output voltage of described adaptation power supply circuit; That is, when described sample voltage value raises, then the PN junction of series connection is reduced; If when described sample voltage value declines, then increase the PN junction of series connection.
Further, the negative electrode of current sample end continued flow tube from energy-storage units of described control module obtains current sampling signal, by judging that the size of this current sampling signal is to control the disconnection of described switching tube, conducting or maintenance.
Further, described control module also comprises: comparing unit, this comparing unit comprises: be suitable for sampling resistor current sampling signal being transferred to voltage sampling signal, and is suitable for the hysteresis voltage compare subelement of the disconnection of the change control switch pipe according to described voltage sampling signal, conducting or maintenance; Described hysteresis voltage compare subelement inputs described voltage sampling signal by its in-phase end, and the output of described hysteresis voltage compare subelement is connected with the control end of described switching tube by an inverter.
Further, described hysteresis voltage compare subelement comprises: comparator, the end of oppisite phase of this comparator inputs a reference voltage, described voltage sampling signal is by the in-phase end of input resistance access comparator, this in-phase end is also connected with one end of a feedback resistance, the output of described comparator is connected with one end of an output resistance, and the output of described comparator is also connected with the other end of described feedback resistance, and the other end of described output resistance is as the output of described hysteresis voltage compare subelement; Set forward threshold voltage, the negative sense threshold voltage of described hysteresis voltage compare subelement; That is, when described voltage sampling signal raises from negative sense threshold voltage, described hysteresis voltage compare subelement output low level, the conducting of control switch pipe, when described voltage sampling signal exceedes forward threshold voltage value, this hysteresis voltage compare subelement exports high level, and control switch pipe is closed; Or when described voltage sampling signal declines from forward threshold voltage, described hysteresis voltage compare subelement exports high level, control switch pipe turns off, when described voltage sampling signal equals negative sense threshold voltage value, this hysteresis voltage compare subelement output low level, the conducting of control switch pipe.
Technique scheme of the present invention has the following advantages compared to existing technology: (1) the present invention is by some PN junctions, the analog switch unit cooperation formation adaptation power supply circuit of microprocessor unit, series connection, these power supply circuits make the acceptable power supply voltage range of control module larger, in described control module when forming non-isolated voltage-dropping type LED drive circuit, without the need to the supply voltage problem of too much consideration input, and optimize circuit greatly, save components and parts; (2) achieved the control of switch tube by hysteresis voltage compare subelement by forward threshold voltage, negative sense threshold voltage, achieve the discharge and recharge to follow-up energy-storage units; (3) by hysteresis voltage compare subelement, the structure of control module is simplified, without the need to the pulse control unit of inside, the break-make that also can realize switching tube controls.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the theory diagram one of non-isolated voltage-dropping type LED drive circuit;
Fig. 2 is the circuit theory diagrams of adaptation power supply circuit;
Fig. 3 is the circuit theory diagrams two of non-isolated voltage-dropping type LED drive circuit;
Fig. 4 is the circuit theory diagrams of comparing unit;
Fig. 5 is the oscillogram of hysteresis voltage compare subelement.
Wherein, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, current sampling signal I
cS, voltage sampling signal U
cS, sampling resistor R11, comparator A1, reference voltage U
r, input resistance R8, feedback resistance R9, output resistance R10, sampling resistor R11, bi-directional voltage stabilizing pipe Z, forward threshold voltage U
tH1, negative sense threshold voltage U
tH2, continued flow tube VD.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Embodiment 1
As depicted in figs. 1 and 2, a kind of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, comprising: current rectifying and wave filtering circuit, be provided with the control module of switching tube, and the feeder ear of this control module is connected with the output of rectification circuit by a resistance R; Be provided with an adaptation power supply circuit in described control module, this adaptation power supply circuit comprises microprocessor unit, forms pressure unit by first, second resistant series, the PN junction unit be made up of the PN junction of some series connection, analog switch unit; The output of described pressure unit is connected with the input of PN junction unit, and this output is as the voltage output end of described adaptation power supply circuit; Be provided with node between described each PN junction, each node is connected with each switch input terminal of described analog switch unit respectively, and each output switching terminal of this analog switch unit is connected, and by a resistance R6 ground connection; Feeder ear described in described microprocessor unit obtains sampled voltage, the control output end of this microprocessor unit is connected with the control end of described analog switch unit respectively, namely, control described analog switch unit according to described sample voltage value open or close respective switch, to increase or to reduce the PN junction of series connection, stablize the output voltage of described adaptation power supply circuit.
The bleeder circuit that described microprocessor unit is consisted of the 3rd resistance R3 and the 4th resistance R4 obtains sampled voltage.
Wherein, PN junction can adopt diode to realize, such as silicone tube or germanium tube.
The effect of described adaptation power supply circuit is available to the supply power voltage of all the other each circuit in control module, and for the other independently-powered circuit of the employing of adaptation power supply circuit itself, can adopt voltage stabilizing circuit to realize; Power supply circuits are overlapped by employing adaptation power supply circuit, independently-powered circuit two, the failure rate of control module can be effectively reduced, and described adaptation power supply circuit is larger than the adjustable range of independently-powered circuit to the adjustable range of voltage, is more conducive to the stable power-supplying of all the other each circuit in control module.
Switch in analog switch unit is realized by inner mos pipe.
As shown in Figure 3, one end of the switching tube of described control module is connected to the input of energy-storage units as voltage output end, and the negative electrode of current sample end continued flow tube VD from energy-storage units of described control module obtains current sampling signal I
cS, by judging this current sampling signal I
cSsize to control the disconnection of described switching tube, conducting or maintenance.
Shown control module also comprises: comparing unit, this comparing unit comprises: be suitable for current sampling signal I
cStransfer voltage sampling signal U to
cSsampling resistor R11, one end of this sampling resistor R11 is connected with described current sample end, its other end ground connection; One end of described sampling resistor R11 is also connected with hysteresis voltage compare subelement, and this hysteresis voltage compare subelement is suitable for inputting described voltage sampling signal U by its in-phase end
cS, the output of described hysteresis voltage compare subelement is connected by the control end of an inverter with described switching tube, and this hysteresis voltage compare subelement is suitable for controlling the disconnection of described switching tube, conducting or maintenance according to the change of sampled voltage.
Described hysteresis voltage compare subelement comprises: comparator A1, and the end of oppisite phase of this comparator A1 inputs a reference voltage U
r, described voltage sampling signal U
cSby the in-phase end of input resistance access comparator A1, this in-phase end is also connected with one end of a feedback resistance R9, the output of described comparator A1 is connected with one end of an output resistance R10, the output of described comparator A1 is also connected with the other end of described feedback resistance R9, and the other end of described output resistance R10 is as the output of described hysteresis voltage compare subelement.
Embodiment 2
On embodiment 1 basis, the present invention also provides a kind of method of work of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, comprise: described microprocessor unit is suitable for controlling described analog switch unit according to described sample voltage value and opens or close respective switch, to increase or to reduce the PN junction of series connection, stablize the output voltage of described adaptation power supply circuit; That is, when described sample voltage value raises, then the PN junction of series connection is reduced; If when described sample voltage value declines, then increase the PN junction of series connection.
The negative electrode of current sample end continued flow tube VD from energy-storage units of described control module obtains current sampling signal I
cS, by judging this current sampling signal I
cSsize to control the disconnection of described switching tube, conducting or maintenance.
Described control module comprises: be suitable for current sampling signal I
cStransfer the sampling resistor of voltage sampling signal U to, and be suitable for according to described voltage sampling signal U
cSthe disconnection of change control switch pipe, conducting or maintenance hysteresis voltage compare subelement; Described hysteresis voltage compare subelement inputs described voltage sampling signal by its in-phase end, and the output of described hysteresis voltage compare subelement is connected with the control end of described switching tube by an inverter.
As shown in Figure 4, described hysteresis voltage compare subelement comprises: comparator A1, and the end of oppisite phase of this comparator A1 inputs a reference voltage U
r, described voltage sampling signal U
cSthe in-phase end of comparator A1 is accessed by input resistance R8, this in-phase end is also connected with one end of a feedback resistance R9, the output of described comparator A1 is connected with one end of an output resistance R10, the output of described comparator A1 is also connected with the other end of described feedback resistance R9, and the other end of described output resistance R10 is as the output of described hysteresis voltage compare subelement; Set the negative sense threshold voltage U of described hysteresis voltage compare subelement
tH2, forward threshold voltage U
tH1.
That is, described voltage sampling signal U
cSfrom negative sense threshold voltage U
tH2when starting to raise, described hysteresis voltage compare subelement output low level, the conducting of control switch pipe, as described voltage sampling signal U
cSwhen exceeding forward threshold voltage value, this hysteresis voltage compare subelement exports high level, and control switch pipe is closed;
Or, described voltage sampling signal U
cSfrom forward threshold voltage U
tH1when starting to decline, described hysteresis voltage compare subelement exports high level, and control switch pipe turns off, as described voltage sampling signal U
cSwhen equaling negative sense threshold voltage value, this hysteresis voltage compare subelement output low level, the conducting of control switch pipe.
Forward threshold voltage
Negative sense threshold voltage
If U
oLget 0, and set suitable reference voltage U
rforward threshold voltage U can be obtained
tH1with negative sense threshold voltage U
tH2, as shown in Figure 5.
Wherein, if switching tube is triode, then described control end is base stage, if metal-oxide-semiconductor, then described control end is G pole.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (2)
1. a non-isolated voltage-dropping type LED drive circuit for adaptation power supply, is characterized in that comprising: current rectifying and wave filtering circuit, be provided with the control module of switching tube, and the feeder ear of this control module is connected with the output of rectification circuit by a resistance;
Be provided with an adaptation power supply circuit in described control module, this adaptation power supply circuit comprises microprocessor unit, forms pressure unit by first, second resistant series, the PN junction unit be made up of the PN junction of some series connection, analog switch unit; The output of described pressure unit is connected with the input of PN junction unit, and this output is as the voltage output end of described adaptation power supply circuit;
Be provided with node between described each PN junction, each node is connected with each switch input terminal of described analog switch unit respectively, and each output switching terminal of this analog switch unit is connected, and by a grounding through resistance;
Described microprocessor unit obtains sampled voltage from described feeder ear, the control output end of this microprocessor unit is connected with the control end of described analog switch unit respectively, namely, control described analog switch unit according to described sample voltage value open or close respective switch, to increase or to reduce the PN junction number of series connection, stablize the output voltage of described adaptation power supply circuit;
One end of switching tube in described control module is connected to the input of energy-storage units as voltage output end, the negative electrode of current sample end continued flow tube from energy-storage units of described control module obtains current sampling signal, by judging that the size of this current sampling signal is to control the disconnection of described switching tube, conducting or maintenance;
Described control module also comprises: comparing unit, this comparing unit comprises: be suitable for sampling resistor current sampling signal being transferred to voltage sampling signal, one end of this sampling resistor is connected with described current sample end, its other end ground connection, one end of described sampling resistor is also connected with hysteresis voltage compare subelement;
Described hysteresis voltage compare subelement is suitable for inputting described voltage sampling signal by its in-phase end, the output of this hysteresis voltage compare subelement is connected by the control end of an inverter with described switching tube, and this hysteresis voltage compare subelement is suitable for controlling the disconnection of described switching tube, conducting or maintenance according to sampled voltage.
2. non-isolated voltage-dropping type LED drive circuit according to claim 1, it is characterized in that, described hysteresis voltage compare subelement comprises: comparator, the end of oppisite phase of this comparator inputs a reference voltage, described voltage sampling signal is by the in-phase end of input resistance access comparator, this in-phase end is also connected with one end of a feedback resistance, the output of described comparator is connected with one end of an output resistance, the output of described comparator is also connected with the other end of described feedback resistance, the other end of described output resistance is as the output of described hysteresis voltage compare subelement.
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| CN108491158B (en) * | 2018-03-15 | 2020-11-17 | 厦门芯阳科技股份有限公司 | Schmitt algorithm-based extended application method and temperature detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN202713145U (en) * | 2012-06-26 | 2013-01-30 | 深圳市力生美半导体器件有限公司 | Voltage reducing type power circuit |
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| US8569956B2 (en) * | 2009-06-04 | 2013-10-29 | Point Somee Limited Liability Company | Apparatus, method and system for providing AC line power to lighting devices |
| US8493000B2 (en) * | 2010-01-04 | 2013-07-23 | Cooledge Lighting Inc. | Method and system for driving light emitting elements |
| CN102685986A (en) * | 2012-04-28 | 2012-09-19 | 绥中中维科技有限公司 | Solar LED lighting driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101668373A (en) * | 2009-09-29 | 2010-03-10 | 李云霄 | LED light source driving circuit supplied by AC power |
| CN202713145U (en) * | 2012-06-26 | 2013-01-30 | 深圳市力生美半导体器件有限公司 | Voltage reducing type power circuit |
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