CN204069423U - 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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- CN204069423U CN204069423U CN201420376442.1U CN201420376442U CN204069423U CN 204069423 U CN204069423 U CN 204069423U CN 201420376442 U CN201420376442 U CN 201420376442U CN 204069423 U CN204069423 U CN 204069423U
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Abstract
The utility model 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, 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 control module, this adaptation power supply circuit comprises processor unit, pressure unit, diode group, analog switch unit; The output of pressure unit is connected with the input of diode group, and this output is as the voltage output end of adaptation power supply circuit; Be provided with node between each diode, 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 utility model relates to a kind of LED drive circuit, particularly relates to a kind of non-isolated voltage-dropping type LED drive circuit of adaptation power supply.
Background technology
Along with the technique of LED (Light-Emitting Diode) 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.
Utility model content
The purpose of this utility model is to provide a kind of non-isolated voltage-dropping type LED drive circuit of adaptation power supply, and 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 utility model 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 processor unit, forms pressure unit by first, second resistant series, the diode group be made up of the diode of some series connection, analog switch unit; The output of described pressure unit is connected with the input of some diodes of series connection, and this output is as the voltage output end of described adaptation power supply circuit; Be provided with node between described each diode, 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 processor unit obtains sampled voltage from described feeder ear, the control output end of this processor 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 diode 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, 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.
Further, in order to the output voltage of stable hysteresis voltage compare subelement, the output of described hysteresis voltage compare subelement also connects bi-directional voltage stabilizing pipe.
Further, in order to simplify circuit, described inverter adopts not gate.
Technique scheme of the present utility model has the following advantages compared to existing technology: (1) the utility model is by some diodes, the analog switch unit cooperation formation adaptation power supply circuit of processor 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, the break-make that the pulse control unit without the need to inside can realize switching tube controls.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below basis specific embodiment and by reference to the accompanying drawings, the utility model is described in further detail, 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 purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.Should be appreciated that, these describe just exemplary, and do not really want to limit scope of the present utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present utility model.
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 processor unit, forms pressure unit by first, second resistant series, the diode group be made up of the diode of some series connection, analog switch unit; The output of described pressure unit is connected with the input of some diodes of series connection, and this output is as the voltage output end of described adaptation power supply circuit; Be provided with node between described each diode, 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; Described processor unit obtains sampled voltage from described feeder ear, the control output end of this processor 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 diode of series connection, stablize the output voltage of described adaptation power supply circuit; When described sample voltage value raises, then reduce the diode of series connection; If when described sample voltage value declines, then increase the diode of series connection.
Described diode can adopt as silicone tube or germanium tube.
The bleeder circuit that described processor unit is consisted of the 3rd resistance R3 and the 4th resistance R4 obtains sampled voltage.
Described processor unit exports the technical scheme of control signal by sampled voltage, is disclosed at the patent documentation " portable power source discharging current detection method and system " of application number 201210410051.2.
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.
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 switch, then described control end is G pole.
The output of described hysteresis voltage compare subelement also connects bi-directional voltage stabilizing pipe Z.
Described inverter adopts not gate.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (6)
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 processor unit, forms pressure unit by first, second resistant series, the diode group be made up of the diode of some series connection, analog switch unit; The output of described pressure unit is connected with the input of described diode group, and this output is as the voltage output end of described adaptation power supply circuit;
Be provided with node between described each diode, 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 processor unit obtains sampled voltage from described feeder ear, and the control output end of this processor unit is connected with the control end of described analog switch unit.
2. non-isolated voltage-dropping type LED drive circuit according to claim 1, it is characterized in that, 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.
3. non-isolated voltage-dropping type LED drive circuit according to claim 2, it is characterized in that, 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, and the output of this hysteresis voltage compare subelement is connected with the control end of described switching tube by an inverter.
4. non-isolated voltage-dropping type LED drive circuit according to claim 3, 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.
5. non-isolated voltage-dropping type LED drive circuit according to claim 4, is characterized in that, the output of described hysteresis voltage compare subelement also connects bi-directional voltage stabilizing pipe.
6., according to the arbitrary described non-isolated voltage-dropping type LED drive circuit of claim 3-5, it is characterized in that, described inverter adopts not gate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420376442.1U CN204069423U (en) | 2014-07-08 | 2014-07-08 | The non-isolated voltage-dropping type LED drive circuit of adaptation power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420376442.1U CN204069423U (en) | 2014-07-08 | 2014-07-08 | The non-isolated voltage-dropping type LED drive circuit of adaptation power supply |
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| Publication Number | Publication Date |
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| CN204069423U true CN204069423U (en) | 2014-12-31 |
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| CN201420376442.1U Active CN204069423U (en) | 2014-07-08 | 2014-07-08 | The non-isolated voltage-dropping type LED drive circuit of adaptation power supply |
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