CN104053289B - The non-isolated voltage-dropping type LED drive circuit of direct acquisition sample rate current and method of work - Google Patents
The non-isolated voltage-dropping type LED drive circuit of direct acquisition sample rate current and method of work Download PDFInfo
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Abstract
本发明涉及一种直接获取采样电流的非隔离降压型LED驱动电路及其工作方法，包括：设有开关管的控制模块，该开关管的一端作为电压输出端连接至储能单元的输入端，所述控制模块的电流采样端从储能单元中续流管的阴极获取电流采样信号，通过判断该电流采样信号的大小以控制所述开关管的断开、导通或保持；本发明在采样过程中无需通过采样电阻进行电压采样，节约了元器件，降低了生产成本；通过滞回电压比较子单元通过正向阈值电压、负向阈值电压实现了对开关管的控制，实现了对后续储能单元的充放电；通过滞回电压比较子单元使控制模块的结构得到精简，无需内部的脉冲控制单元来实现开关管的通断。
The invention relates to a non-isolated step-down LED drive circuit for directly obtaining sampling current and a working method thereof, comprising: a control module provided with a switch tube, one end of the switch tube is used as a voltage output end and connected to an input end of an energy storage unit , the current sampling terminal of the control module obtains a current sampling signal from the cathode of the freewheeling tube in the energy storage unit, and controls the disconnection, conduction or maintenance of the switching tube by judging the magnitude of the current sampling signal; In the sampling process, there is no need to sample the voltage through the sampling resistor, which saves components and reduces the production cost; through the hysteresis voltage comparison subunit, the control of the switching tube is realized through the positive threshold voltage and the negative threshold voltage, and the follow-up The charge and discharge of the energy storage unit; the structure of the control module is simplified through the hysteresis voltage comparison sub-unit, and the internal pulse control unit is not required to realize the on-off of the switch tube.
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 of direct acquisition sample rate current.
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 sampled voltage of traditional non-isolated voltage-dropping type LED drive circuit obtains often by sampling resistor dividing potential drop, such design makes circuit production cost improve, and circuit design is also tending towards complicated.
Summary of the invention
The object of this invention is to provide a kind of non-isolated voltage-dropping type LED drive circuit of direct acquisition sample rate current, the structure of this LED drive circuit is more simple, effectively reduces cost of manufacture.
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 direct acquisition sample rate current, comprise: the control module being provided with switching tube, one end of this switching tube 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, and this comparing unit comprises: be suitable for sampling resistor current sampling signal being transferred to voltage sampling signal, and 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 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.
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 other end of this output resistance is connected with one end of the other end of described feedback resistance and bi-directional voltage stabilizing pipe, using the output as 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 direct acquisition sample rate current, comprise: 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 other end of this output resistance is connected with one end of the other end of described feedback resistance and bi-directional voltage stabilizing pipe, using the output as 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) present invention optimizes the peripheral circuit of control module, has saved components and parts, has reduced production cost; (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 pulse control unit without the need to inside realizes the break-make of switching tube.
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 circuit theory diagrams of non-isolated buck-type LED drive circuit;
Fig. 2 is the circuit theory diagrams of comparing unit;
Fig. 3 is the oscillogram of hysteresis voltage compare subelement.
Wherein, current sampling signal I
cS, voltage sampling signal U
cS, sampling resistor R
5, comparator A1, reference voltage U
r, input resistance R
2, feedback resistance R
3, output resistance R
4, output resistance R
5, 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 shown in Figure 1, a kind of non-isolated voltage-dropping type LED drive circuit of direct acquisition sample rate current, comprise: the control module being provided with switching tube, one end of this switching tube is connected to the input of energy-storage units as voltage output end, 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 R
5, this sampling resistor R
5one end be connected with described current sample end, its other end ground connection; Described sampling resistor R
5one end be also connected with hysteresis voltage compare subelement, 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 also with a feedback resistance R
3one end be connected, the output of described comparator A1 and an output resistance R
4one end be connected, this output resistance R
4the other end and described feedback resistance R
3the other end and one end of bi-directional voltage stabilizing pipe Z be connected, using the output as 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 described direct acquisition sample rate current, comprising: 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 also comprises: comparing unit, and this comparing unit comprises: be suitable for current sampling signal I
cStransfer voltage sampling signal U to
cSsampling resistor, and to 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.
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 input resistance R
2the in-phase end of access comparator A1, this in-phase end also with a feedback resistance R
3one end be connected, the output of described comparator A1 and an output resistance R
4one end be connected, this output resistance R
4the other end and described feedback resistance R
3the other end and one end of bi-directional voltage stabilizing pipe Z be connected, using the output as 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.
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 3.
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 (5)
1. one kind directly obtains the non-isolated voltage-dropping type LED drive circuit of sample rate current, it is characterized in that comprising: the control module being provided with switching tube, one end of this switching tube 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, and this comparing unit comprises: be suitable for sampling resistor current sampling signal being transferred to voltage sampling signal, and 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 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.
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 other end of this output resistance is connected with one end of the other end of described feedback resistance and bi-directional voltage stabilizing pipe, using the output as described hysteresis voltage compare subelement.
3. the method for work of the non-isolated voltage-dropping type LED drive circuit of a direct acquisition sample rate current according to claim 1, it is characterized in that comprising: 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.
4. method of work according to claim 3, it is characterized in that, described control module also comprises: comparing unit, this 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.
5. method of work according to claim 4, 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 other end of this output resistance is connected with one end of the other end of described feedback resistance and bi-directional voltage stabilizing pipe, using the output as 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.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203968468U (en) * | 2014-07-09 | 2014-11-26 | 浙江大学常州工业技术研究院 | Directly obtain the non-isolated buck-type LED drive circuit of sample rate current |
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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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203968468U (en) * | 2014-07-09 | 2014-11-26 | 浙江大学常州工业技术研究院 | Directly obtain the non-isolated buck-type LED drive circuit of sample rate current |
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