CN203984724U - LED constant-current drive circuit, Switching Power Supply and lighting apparatus - Google Patents
LED constant-current drive circuit, Switching Power Supply and lighting apparatus Download PDFInfo
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- CN203984724U CN203984724U CN201420290589.9U CN201420290589U CN203984724U CN 203984724 U CN203984724 U CN 203984724U CN 201420290589 U CN201420290589 U CN 201420290589U CN 203984724 U CN203984724 U CN 203984724U
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Abstract
A kind of LED constant-current drive circuit, Switching Power Supply and lighting apparatus, Switching Power Supply comprises current controller, N-type metal-oxide-semiconductor, fly-wheel diode, inductor, filter capacitor and sampling module, described sampling module comprises: the first sampling resistor, first end is connected with the source electrode of described metal-oxide-semiconductor, the second end ground connection; Comparison module, positive input terminal is connected with the source electrode of described metal-oxide-semiconductor, and output is connected with the sampling end of described current controller; The first divider resistance, the first termination stabilized voltage power supply, the second end is connected with the negative input end of described comparison module; Resistance handover module, first end is connected with the second end of described the first divider resistance, and the second end ground connection utilizes the resistance of the different resistances of switching over to be placed between described the first divider resistance and ground.In main circuit loop, large electric current is not by the switch of resistance handover module like this, and just can not be affected the useful life of switch, more can not occur because of potential safety hazards such as aging arcings, and can realize the LED driving product that power is larger.
Description
Technical field
The utility model relates to LED lighting technology, particularly relates to a kind of LED constant-current drive circuit, Switching Power Supply and lighting apparatus.
Background technology
In LED illumination, drive in application technology, it is generally by floating the BUCK type the electric circuit constitute of exporting that many gears LED drives.Current sample comparator by high-performance current mode controller inside comes control switch pipe to conduct.
As Fig. 1, many gears electric current is exactly that control switch K changes resistance R
son resistance, the sampled voltage of the sampling pin CS of controller U is changed, switch conduction that just can control switch pipe Q, thereby control output current.Therefore, when switching gear toggle switch K, the K switch of also just flowing through of major loop.In long-term work or often switch gear, the contact of K switch will be aging, and fault engenders.Therefore, K switch can not be passed through larger electric current, thus the power of limits product; In addition, K switch is applied in the main current loop of circuit, after K switch is aging, easily occurs that the phenomenons such as arcing even appear in loose contact, and the security reliability of product will reduce.
Utility model content
Based on this, be necessary to provide a kind of switch life that improves, avoid the LED constant-current drive circuit of potential safety hazard.
A Switching Power Supply, comprises current controller, N-type metal-oxide-semiconductor, fly-wheel diode, inductor, filter capacitor and sampling module, and the anode of described fly-wheel diode is connected with the first end of the drain electrode of described metal-oxide-semiconductor, described inductor, and negative electrode connects DC power supply; The two ends of described filter capacitor are accessed respectively described DC power supply and are connected with the second end of described inductor, and respectively as two outputs of Switching Power Supply; The control end of current controller is connected with the grid of described metal-oxide-semiconductor, the source electrode of sampling end and described metal-oxide-semiconductor is by described sampling module ground connection, described controller is controlled the switch opportunity of described metal-oxide-semiconductor according to the magnitude of voltage size of sampling, thereby controls output current size, and described sampling module comprises:
The first sampling resistor, first end is connected with the source electrode of described metal-oxide-semiconductor, the second end ground connection;
Comparison module, positive input terminal is connected with the source electrode of described metal-oxide-semiconductor, and output is connected with the sampling end of described current controller;
The first divider resistance, the first termination stabilized voltage power supply, the second end is connected with the negative input end of described comparison module;
Resistance handover module, first end is connected with the second end of described the first divider resistance, and the second end ground connection utilizes the resistance of the different resistances of switching over to be placed between described the first divider resistance and ground.
Further, described resistance handover module comprises a plurality of the second divider resistances and a plurality of switch, the number of this second divider resistance and switch is identical, after the plurality of the second divider resistance is connected in series, connect the second end of described the first divider resistance, and described in each, the second divider resistance passes through respectively described switch ground connection away from one end of this first divider resistance.
Further, described comparison module comprises comparator, and the positive input of this comparator, inverting input, output are respectively as positive input terminal, negative input end, the output of described comparison module.
Further, described comparison module also comprises:
Analog conversion module, the second end of input and described the first divider resistance, the magnitude of voltage of sampling according to described resistance handover module is at its output output reference voltage;
Internal reference module, input is connected with the output of described analog conversion module, and output is connected with the inverting input of described comparator, is input to the inverting input of described comparator after described reference voltage is calibrated.
In addition, a kind of LED constant-current drive circuit is also provided, for driving LED load, comprise current controller, N-type metal-oxide-semiconductor, fly-wheel diode, inductor, filter capacitor and sampling module, the anode of described fly-wheel diode is connected with the first end of the drain electrode of described metal-oxide-semiconductor, described inductor, and negative electrode connects DC power supply; The first end of described filter capacitor accesses described DC power supply and is connected with the anode of described LED load, and the second end is connected with the second end of described inductor and the negative terminal of described LED load; The control end of current controller is connected with the grid of described metal-oxide-semiconductor, the source electrode of sampling end and described metal-oxide-semiconductor is by described sampling module ground connection, described controller is controlled the switch opportunity of described metal-oxide-semiconductor according to the magnitude of voltage size of sampling, thereby control to the size of the electric current of described LED load output, described sampling module comprises:
The first sampling resistor, first end is connected with the source electrode of described metal-oxide-semiconductor, the second end ground connection;
Comparison module, positive input terminal is connected with the source electrode of described metal-oxide-semiconductor, and output is connected with the sampling end of described current controller;
The first divider resistance, the first termination stabilized voltage power supply, the second end is connected with the negative input end of described comparison module;
Resistance handover module, first end is connected with the second end of described the first divider resistance, and the second end ground connection utilizes the resistance of the different resistances of switching over to be placed between described the first divider resistance and ground.
Further, described resistance handover module comprises a plurality of the second divider resistances and a plurality of switch, the number of this second divider resistance and switch is identical, after the plurality of the second divider resistance is connected in series, connect the second end of described the first divider resistance, and described in each, the second divider resistance passes through respectively described switch ground connection away from one end of this first divider resistance.
Further, described comparison module comprises comparator, and the positive input of this comparator, inverting input, output are respectively as positive input terminal, negative input end, the output of described comparison module.
Further, described comparison module also comprises:
Analog conversion module, the second end of input and described the first divider resistance, the magnitude of voltage of sampling according to described resistance handover module is at its output output reference voltage;
Internal reference module, input is connected with the output of described analog conversion module, and output is connected with the inverting input of described comparator, is input to the inverting input of described comparator after described reference voltage is calibrated.
In addition, also provide a kind of lighting apparatus, comprised above-mentioned Switching Power Supply; Or above-mentioned LED constant-current drive circuit and LED load.
Above-mentioned Switching Power Supply or LED constant-current drive circuit connect comparison module by adopting on resistance, when resistance handover module switches resistance gear, the magnitude of voltage that current controller only need to be sampled by stabilized voltage power supply dividing potential drop forms reference voltage, the sampling end that makes comparison module output signal to current controller conducts to control the switch of metal-oxide-semiconductor, thereby control output current, the current value that obtains wanting.In main circuit loop, large electric current is not by the switch of resistance handover module like this, and just can not be affected the useful life of switch, more can not occur because of potential safety hazards such as aging arcings, and can realize the LED driving product that power is larger.
Accompanying drawing explanation
Fig. 1 is existing LED drive circuit;
Fig. 2 is the LED constant-current drive circuit in the utility model preferred embodiment.
Embodiment
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 2, LED constant-current drive circuit in the utility model preferred embodiment, it is for driving LED load, this LED constant-current drive circuit mainly comprises Switching Power Supply, and this Switching Power Supply comprises current controller U1, N-type metal-oxide-semiconductor Q1, sustained diode 1, inductor L1, filter capacitor C1 and sampling module 10.
The anode of sustained diode 1 is connected with the drain electrode of metal-oxide-semiconductor Q1 and the first end of inductor L1, and the negative electrode of sustained diode 1 connects DC power supply DC.The two ends of filter capacitor C1 are accessed respectively DC power supply DC and are connected with the second end of inductor L1, and respectively as two outputs of Switching Power Supply, wherein, first end access DC power supply DC is also connected with the anode of LED load, and the second end is connected with the second end of inductor L1 and the negative terminal of LED load.
The control end of current controller U1 is connected with the grid of metal-oxide-semiconductor Q1, and the source electrode of sampling end and metal-oxide-semiconductor Q1 is by sampling module 10 ground connection, and current controller U1 controls the switch opportunity of metal-oxide-semiconductor Q1 according to the magnitude of voltage size of sampling, thereby controls output current size.Current controller U1 can select the UCx843B/2/3843B chip of ST (STMicw Electronics).
In the present embodiment, sampling module 10 comprises: the first sampling resistor Rs, comparison module 11, the first divider resistance R1, resistance handover module 12.
The first end of the first sampling resistor Rs is connected with the source electrode of metal-oxide-semiconductor Q1, the second end ground connection of the first sampling resistor Rs; The positive input terminal of comparison module 11 is connected with the source electrode of metal-oxide-semiconductor Q1, and the output of comparison module 11 is connected with the sampling end of current controller U1.The second end of first termination stabilized voltage power supply VDD the first divider resistance R1 of the first divider resistance R1 is connected with the negative input end of comparison module 11.The first end of resistance handover module 12 is connected with the second end of the first divider resistance R1, the second end ground connection, and resistance handover module 12 utilizes the switch having, and the resistance that switches different resistances is placed between the first divider resistance R1 and ground.
Further, resistance handover module 12 comprises a plurality of the second divider resistance R2 and a plurality of K switch, the number of this second divider resistance R2 and K switch is identical, after the plurality of the second divider resistance R2 is connected in series, connect the second end of the first divider resistance R1, and each second divider resistance R2 passes through respectively K switch ground connection away from one end of this first divider resistance R1.
Further, comparison module 11 comprises comparator, and the positive input of this comparator OP1, inverting input, output difference be positive input terminal, negative input end, the output of module 11 as a comparison.
Preferably, comparison module 11 also comprises analog conversion module 112, internal reference module 114.The second end of the input of analog conversion module 112 and the first divider resistance R1, the magnitude of voltage that analog conversion module 112 is sampled according to resistance handover module 12 is at its output output reference voltage; The input of internal reference module 114 is connected with the output of analog conversion module 112, and the output of internal reference module 114 is connected with the inverting input of comparator OP1, is input to the inverting input of comparator OP1 after reference voltage is calibrated.In one embodiment, comparison module 11 can solidify in a chip.
By the obstructed too much driving switch K of large electric current, the function of K switch only plays gear switch, directly connect the second divider resistance R2 to ground, now the second divider resistance R2 does not need collection signal to the inner current sample comparator OP1 of current controller U1 (as UCx843).
Increase comparison module 11, many gears toggle switch K only need connect inner analog level sampling just can differentiate the size of current of each gear.Utilize the comparator OP1 output low and high level signal of comparison module 11 inside, this signal is accessed to the K switch conduction of having controlled metal-oxide-semiconductor Q1 since the sampling end of current controller U1 again, so just can control size of current, thereby reach the powerful requirement of minute gear.
In addition, also provide a kind of lighting apparatus, comprised above-mentioned Switching Power Supply; Or above-mentioned LED constant-current drive circuit and LED load.
Above-mentioned K switch power supply or LED constant-current drive circuit connect comparison module 11 by adopting on resistance, when resistance handover module 12 switches resistance gear, the magnitude of voltage that current controller U1 only need to sample by stabilized voltage power supply VDD dividing potential drop forms reference voltage, the sampling end that makes comparison module 11 output signal to current controller U1 conducts to control the K switch of metal-oxide-semiconductor Q1, thereby control output current, the current value that obtains wanting.In main circuit loop, large electric current is not by the K switch of resistance handover module 12 like this, and just can not be affected the useful life of K switch, more can not occur because of potential safety hazards such as aging arcings, and can realize the LED driving product that power is larger.
Above embodiment has only expressed several execution mode of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. a Switching Power Supply, comprises current controller, N-type metal-oxide-semiconductor, fly-wheel diode, inductor, filter capacitor and sampling module, and the anode of described fly-wheel diode is connected with the first end of the drain electrode of described metal-oxide-semiconductor, described inductor, and negative electrode connects DC power supply; The two ends of described filter capacitor are accessed respectively described DC power supply and are connected with the second end of described inductor, and respectively as two outputs of Switching Power Supply; The control end of current controller is connected with the grid of described metal-oxide-semiconductor, the source electrode of sampling end and described metal-oxide-semiconductor is by described sampling module ground connection, described current controller is controlled the switch opportunity of described metal-oxide-semiconductor according to the magnitude of voltage size of sampling, thereby control output current size, it is characterized in that, described sampling module comprises:
The first sampling resistor, first end is connected with the source electrode of described metal-oxide-semiconductor, the second end ground connection;
Comparison module, positive input terminal is connected with the source electrode of described metal-oxide-semiconductor, and output is connected with the sampling end of described current controller;
The first divider resistance, the first termination stabilized voltage power supply, the second end is connected with the negative input end of described comparison module;
Resistance handover module, first end is connected with the second end of described the first divider resistance, and the second end ground connection utilizes the resistance of the different resistances of switching over to be placed between described the first divider resistance and ground.
2. Switching Power Supply according to claim 1, it is characterized in that, described resistance handover module comprises a plurality of the second divider resistances and a plurality of switch, the number of this second divider resistance and switch is identical, after the plurality of the second divider resistance is connected in series, connect the second end of described the first divider resistance, and described in each, the second divider resistance passes through respectively described switch ground connection away from one end of this first divider resistance.
3. Switching Power Supply according to claim 1 and 2, is characterized in that, described comparison module comprises comparator, and the positive input of this comparator, inverting input, output are respectively as positive input terminal, negative input end, the output of described comparison module.
4. Switching Power Supply according to claim 3, is characterized in that, described comparison module also comprises:
Analog conversion module, the second end of input and described the first divider resistance, the magnitude of voltage of sampling according to described resistance handover module is at its output output reference voltage;
Internal reference module, input is connected with the output of described analog conversion module, and output is connected with the inverting input of described comparator, is input to the inverting input of described comparator after described reference voltage is calibrated.
5. a LED constant-current drive circuit, for driving LED load, comprise current controller, N-type metal-oxide-semiconductor, fly-wheel diode, inductor, filter capacitor and sampling module, the anode of described fly-wheel diode is connected with the first end of the drain electrode of described metal-oxide-semiconductor, described inductor, and negative electrode connects DC power supply; The first end of described filter capacitor accesses described DC power supply and is connected with the anode of described LED load, and the second end is connected with the second end of described inductor and the negative terminal of described LED load; The control end of current controller is connected with the grid of described metal-oxide-semiconductor, the source electrode of sampling end and described metal-oxide-semiconductor is by described sampling module ground connection, described current controller is controlled the switch opportunity of described metal-oxide-semiconductor according to the magnitude of voltage size of sampling, thereby control to the size of the electric current of described LED load output, it is characterized in that, described sampling module comprises:
The first sampling resistor, first end is connected with the source electrode of described metal-oxide-semiconductor, the second end ground connection;
Comparison module, positive input terminal is connected with the source electrode of described metal-oxide-semiconductor, and output is connected with the sampling end of described current controller;
The first divider resistance, the first termination stabilized voltage power supply, the second end is connected with the negative input end of described comparison module;
Resistance handover module, first end is connected with the second end of described the first divider resistance, and the second end ground connection utilizes the resistance of the different resistances of switching over to be placed between described the first divider resistance and ground.
6. LED constant-current drive circuit according to claim 5, it is characterized in that, described resistance handover module comprises a plurality of the second divider resistances and a plurality of switch, the number of this second divider resistance and switch is identical, after the plurality of the second divider resistance is connected in series, connect the second end of described the first divider resistance, and described in each, the second divider resistance passes through respectively described switch ground connection away from one end of this first divider resistance.
7. according to the LED constant-current drive circuit described in claim 5 or 6, it is characterized in that, described comparison module comprises comparator, and the positive input of this comparator, inverting input, output are respectively as positive input terminal, negative input end, the output of described comparison module.
8. LED constant-current drive circuit according to claim 7, is characterized in that, described comparison module also comprises:
Analog conversion module, the second end of input and described the first divider resistance, the magnitude of voltage of sampling according to described resistance handover module is at its output output reference voltage;
Internal reference module, input is connected with the output of described analog conversion module, and output is connected with the inverting input of described comparator, is input to the inverting input of described comparator after described reference voltage is calibrated.
9. a lighting apparatus, is characterized in that, comprises the Switching Power Supply described in claim 1 to 4 any one; Or
Comprise LED constant-current drive circuit and LED load described in claim 5 to 8 any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420290589.9U CN203984724U (en) | 2014-05-30 | 2014-05-30 | LED constant-current drive circuit, Switching Power Supply and lighting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420290589.9U CN203984724U (en) | 2014-05-30 | 2014-05-30 | LED constant-current drive circuit, Switching Power Supply and lighting apparatus |
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| CN203984724U true CN203984724U (en) | 2014-12-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
| CN107834821A (en) * | 2017-12-11 | 2018-03-23 | 东莞市港奇电子有限公司 | One kind detection circuit, power supply constant-current circuit and power supply constant-current device |
| CN110138218A (en) * | 2019-06-25 | 2019-08-16 | 深圳市海浦蒙特科技有限公司 | A kind of band-type brake power supply of adjustable output voltage |
| CN112332823A (en) * | 2020-10-19 | 2021-02-05 | 北京动力源科技股份有限公司 | Direct current switch |
| CN112702047A (en) * | 2021-01-04 | 2021-04-23 | 长江存储科技有限责任公司 | Switching device, integrated circuit, and electronic apparatus |
-
2014
- 2014-05-30 CN CN201420290589.9U patent/CN203984724U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188232A (en) * | 2015-10-23 | 2015-12-23 | 深圳市奇脉电子技术有限公司 | LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit |
| CN107834821A (en) * | 2017-12-11 | 2018-03-23 | 东莞市港奇电子有限公司 | One kind detection circuit, power supply constant-current circuit and power supply constant-current device |
| CN107834821B (en) * | 2017-12-11 | 2024-02-23 | 东莞市港奇电子有限公司 | Detection circuit, power supply constant current circuit and power supply constant current device |
| CN110138218A (en) * | 2019-06-25 | 2019-08-16 | 深圳市海浦蒙特科技有限公司 | A kind of band-type brake power supply of adjustable output voltage |
| CN110138218B (en) * | 2019-06-25 | 2020-08-11 | 深圳市海浦蒙特科技有限公司 | Band-type brake power supply with adjustable output voltage |
| CN112332823A (en) * | 2020-10-19 | 2021-02-05 | 北京动力源科技股份有限公司 | Direct current switch |
| CN112332823B (en) * | 2020-10-19 | 2024-01-26 | 北京动力源科技股份有限公司 | DC switch |
| CN112702047A (en) * | 2021-01-04 | 2021-04-23 | 长江存储科技有限责任公司 | Switching device, integrated circuit, and electronic apparatus |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20200530 |