CN202551453U - Constant Power LED Driver - Google Patents
Constant Power LED Driver Download PDFInfo
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- CN202551453U CN202551453U CN2012201726996U CN201220172699U CN202551453U CN 202551453 U CN202551453 U CN 202551453U CN 2012201726996 U CN2012201726996 U CN 2012201726996U CN 201220172699 U CN201220172699 U CN 201220172699U CN 202551453 U CN202551453 U CN 202551453U
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- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000005669 field effect Effects 0.000 claims description 11
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The utility model discloses a constant power LED drive arrangement is a power drive first LED group and a second LED group that uses alternating voltage 110 volts or 220 volts, and it contains a detection module, a switch module and a current control module. The detection module detects the power supply voltage, when the voltage is 110 volts, the switch module is conducted to enable the first light-emitting diode group to be connected with the second light-emitting diode group in parallel, and the current control module improves the working current; when the voltage is 220V, the switch module is cut off to connect the first LED group with the second LED group in series, and the current control module reduces the working current, so that the circuit has the working characteristics of double-voltage constant power, the circuit is simplified, and the working efficiency and the service life are improved.
Description
Technical field
The utility model be belong to light-emitting diode (Light-Emitting Diode, the LED) technical field of drive circuit, particularly about a kind of be the fixed power led drive unit of supply voltage with alternating voltage 110 volts (V) or 220V.
Background technology
After LED sweeps across illumination market with its low power consumption and characteristic such as high-effect, become the target that each manufacturer endeavours to study brightness of illumination, operating efficiency or useful life etc. how to control the LED light fixture.And at present; The drive unit of LED light fixture is the circuit design frameworks of deciding electric current that adopt more; As shown in Figure 1; Existing should decide electric current led drive circuit 1 be to make at least one LED group 2 serial connection one transistor 10 and sensing resistor 11, this sensing resistor 11 detects operating current I and the formation pressure drop and feed back to a comparator 12 in two ends of this LED group 2.Then, this comparator 12 is the pressure drop and the reference voltage that are fed back of this sensing resistor 11 relatively, when this reference voltage during greater than this pressure drop; This comparator 12 outputs one high levle signal; Otherwise then be a low level signal, adjust pulse wave width modulation (Pulse Width Modulation, PWM) the empty accounting of signal with conducting or by this transistor 10; Make the driving voltage size of adjustment output, the operating current I that keeps this LED group 2 is in a steady state.
Yet; Above-mentioned should decide though electric current led drive circuit 1 is applicable to 80～260 volts of civil powers and convenient use; But the circuit element that is provided with instant adjustment driving voltage for testing change in current amount; Such as PWM chip, charge and discharge capacitance and inductance etc. this circuit complexity of deciding electric current led drive circuit 1 will be increased, and cause production cost height and small product size big, and circuit elements such as said chip, electric capacity and inductance will increase the virtual work consumption and reduce whole work efficiency.Moreover along with the microminiaturized trend of electronic product, the circuit complexity height will make the LED light fixture be difficult to heat radiation, reduction of service life because of the circuit element clustering.
Prior art
1-decides the electric current led drive circuit; The 10-transistor; The 11-sensing resistor; The 12-comparator; The 2-LED group;
The utility model
The fixed power led drive unit of 3-; The 30-power supply; The 31-detection module; The 310-rectification unit; The 311-partial pressure unit; 3110-delay cell; The 312-detecting unit; The 32-switch module; 320-first switch element; 321-second switch unit; The 33-current control module; 330-the 3rd switch element; The 331-impedance unit; 3310-second resistance; 3311-the 3rd resistance; 332-NMOS; 333-first resistance; 334-three ends can be adjusted pressurizer; 34-first light-emitting diode group; 35-second light-emitting diode group; The 36-high-voltage diode.
Summary of the invention
Because the problem of existing skill, the purpose of the utility model is to provide a kind of fixed power led drive unit, promotes operating efficiency to reduce the virtual work consumption, and increases useful life.
For reaching above-mentioned purpose, the utility model provides a kind of fixed power led drive unit, is to use a power drives one first light-emitting diode group and one second light-emitting diode group of 110 volts of alternating voltages or 220 volts, and it comprises:
One detection module is to electrically connect this power supply, and the alternating voltage and the dividing potential drop that receive this power supply form a detected value, and this detection module relatively this detected value and a preset value, and when this detected value during less than this preset value, this detection module is exported and joined signal in the lump; When this detected value during greater than this preset value, this detection module is exported a string signal;
One switch module is to be provided with one first switch element and a second switch unit, and this first switch element couples this detection module and this second light-emitting diode group; This second switch unit couples this first switch element and this first light-emitting diode group; When this switch module receives should the parallel connection signal time; This first switch element and this second switch unit are conductings respectively and make this second light-emitting diode group of this first light-emitting diode group parallel connection, and this switch module is exported a low pressure signal; When this switch module receives should the series connection signal time, this first switch element and this second switch unit be respectively by and make this this second light-emitting diode group of first light-emitting diode group series connection, and this switch module is exported a high pressure signal; And
One current control module; Be to electrically connect this switch module, this first light-emitting diode group and this second light-emitting diode group; This current control module has one the 3rd switch element and an impedance unit; When this current control module received this low pressure signal, the 3rd switch element was conducting and the resistance of this impedance unit is dwindled, to form one first operating current; When this current control module receives this high pressure signal, the 3rd switch element be by and the resistance of this impedance unit is increased, to form this second operating current, make this first operating current greater than this second operating current.
During enforcement; This current control module has a N type metal oxide semiconductor field-effect transistor and one or three ends can be adjusted pressurizer; The grid of this N type metal oxide semiconductor field-effect transistor is to couple this three end can adjust the anode tap of pressurizer, and couples its drain electrode after being connected in series one first resistance; The drain electrode of this N type metal oxide semiconductor field-effect transistor couples this second light-emitting diode group and this second switch unit; The source electrode of this N type metal oxide semiconductor field-effect transistor couples reference edge and one second resistance that this three end can be adjusted pressurizer; Be connected in series one the 3rd resistance after coupling the 3rd switch element simultaneously, to form this impedance unit by this second resistance and the 3rd resistance.
During enforcement, when this current control module received this low pressure signal, the 3rd switch element was conducting and make this second resistance parallel connection the 3rd resistance.
During enforcement, this detection module is provided with a rectification unit, a partial pressure unit and a detecting unit, and this rectification unit couples this power supply and this partial pressure unit, and this detecting unit couples this partial pressure unit and this first switch element.
During enforcement, this detecting unit is that one or three ends can be adjusted pressurizer.
During enforcement, this preset value can be adjusted the inner fiducial value of pressurizer for this three end, and this fiducial value is 135～145 volts.
During enforcement, this partial pressure unit is to couple this detecting unit through a delay cell.
During enforcement, this first switch element, this second switch unit and the 3rd switch element are an optical coupler, a solid-state relay, an optical relay or a field-effect transistor.
During enforcement, this first light-emitting diode group is through this second light-emitting diode group of high-voltage diode serial connection.
In sum; The fixed power led drive unit of the utility model is when this supply voltages of different sizes; It is series-parallel circuit design framework of controlling two light-emitting diode group with this pass die sinking piece according to the size of this supply voltage; Compared to the existing constant-current driver framework that adopts pulse wave width modulation, promptly have simple relatively circuit and can dwindle the volume of application apparatus.And; The mode of Control work size of current through the resistance of this impedance unit of the 3rd switch element adjustment; Design architecture compared to utilizing capacitor charge and discharge or inductance magnetic strength effect adjustment size of current is to have than the high-temperature resistant degree; And can reduce the virtual work consumption and the lifting operating efficiency, and increase useful life.
Description of drawings
Fig. 1 is the existing circuit diagram of deciding the electric current led drive circuit.
Fig. 2 is the calcspar of the utility model preferred embodiment.
Fig. 3 is the circuit diagram of the utility model preferred embodiment.
Fig. 4 A is the action sketch map of the utility model preferred embodiment in the 110V supply voltage.
Fig. 4 B is the action equivalent schematic of the utility model preferred embodiment in the 110V supply voltage.
Fig. 5 A is the action sketch map of the utility model preferred embodiment in the 220V supply voltage.
Fig. 5 B is the action equivalent schematic of the utility model preferred embodiment in the 220V supply voltage.
Description of reference numerals:
Embodiment
For making your juror can know the content of understanding the utility model, sincerely graphic with the description collocation, please consult.
See also Fig. 2～4A, 5A, it is the calcspar, circuit diagram of the utility model preferred embodiment, in the action sketch map of 110V supply voltage and in the action sketch map of 220V supply voltage.As shown in the figure; Should fixed power led drive unit 3 be that a power supply 30 power supplies in alternating voltage 110V or 220V drive one first light-emitting diode group 34 and one second light-emitting diode group 35 down, and this first light-emitting diode group 34 and this second light-emitting diode group 35 be to be made up of 34～36 LEDs serial connection respectively.Should fixed power led drive unit 3 comprise a detection module 31, a switch module 32 and a current control module 33.This detection module 31 electrically connects these power supplys 30, and is provided with a rectification unit 310, a partial pressure unit 311 and a detecting unit 312.This switch module 32 electrically connects this detection module 312; Be provided with one first switch element 320 and a second switch unit 321 of serial connection; And this first switch element 320 couples this second light-emitting diode group 35, and this second switch unit 321 couples this first light-emitting diode group 34.This current control module 33 electrically connects this switch module 32; Has one the 3rd switch element 330 and an impedance unit 331, a NMOS332 and one or three ends can be adjusted pressurizer 334; The grid of this NMOS 332 is to couple this three end can adjust the anode tap of pressurizer 334, and couples its drain electrode after being connected in series one first resistance 333.The drain electrode of this NMOS 332 couples this second light-emitting diode group 35 and this second switch unit 321.The source electrode of this NMOS 3 32 couples reference edge and one second resistance 3310 that this three end can be adjusted pressurizer 3 34; Couple the 3rd switch element 330 back serial connection one the 3rd resistance 3311 simultaneously; So, this second resistance 3310 and the 3rd resistance 3311 promptly form this impedance unit 331.
This rectification unit 310 is a full-wave bridge rectifier circuit, couples this power supply 30 with these power supply 30 voltages of rectification.This partial pressure unit 311 is to be made up of two resistance serial connection; Couple this rectification unit 310 and form a detected value with these power supply 30 voltages of dividing potential drop; And this partial pressure unit 311 couples this detecting unit 312 through a delay cell 3110; This delay cell 3110 can be thermistor, and (Nagative Temperature Coefficience NTC) forms the slow effect that starts, and connects this power supply 30 moments generation surging and damaged circuit to avoid the utility model.This detecting unit 312 can be one or three ends can adjust pressurizer; Its reference edge is coupled between two resistance, and its anode tap couples this first switch element 320, after receiving this detected value, to compare a fiducial value and this detected value of its inner 135～145V; If this detected value is less than this fiducial value; Represent that this power supply 30 is 110V, at this moment, this detection module 312 ends and output joins signal in the lump.Otherwise if this detected value is greater than this fiducial value, then this power supply 30 is exported a string signal for 220V and 31 conductings of this detection module.
And; When this switch module 32 receives should the parallel connection signal time; This first switch element 320 and this second switch unit 321 are conductings respectively; Make this first light-emitting diode group 34 and this second light-emitting diode group 35 parallel with one another and distinctly carry 110V, shown in Fig. 4 B, it is the action equivalent schematic of the utility model preferred embodiment in the 110V supply voltage.At this moment, this switch module 32 outputs one low pressure signal makes this second resistance, 3310 parallel connections the 3rd resistance 3311 to this current control module 33 with conducting the 3rd switch element 330, and the resistance of dwindling this impedance unit 331 forms one first operating current.
Otherwise shown in Fig. 5 B, it is the action equivalent schematic of the utility model preferred embodiment in the 220V supply voltage; When these switch module 32 receptions should be connected signal; This first switch element 320 and this second switch unit 321 are to end respectively, make this first light-emitting diode group 34 and the 35 mutual series connection of this second light-emitting diode group and carry 220V jointly, and these switch module 32 output one high pressure signal to these current control module 33; To end the 3rd switch element 3311; At this moment, the resistance of this impedance unit 331 is the resistance of this second resistance 3310, forms this second operating current.Because the resistance of this second resistance 3310 is the resistances greater than this second resistance, 3310 parallel connections the 3rd resistance 3311, so this first operating current greater than this second operating current, so according to the P=VI principle, can be kept fixedly power consumption.
Incidentally be; This first switch element 320, this second switch unit 321 and the 3rd switch element 330 are an optical coupler, a solid-state relay, an optical relay or a field-effect transistor; And this first light-emitting diode group 34 is through these second light-emitting diode group 35 of a high-voltage diode 36 serial connection, produces moment reverse current and damaged circuit when avoiding switching connection in series-parallel.
The above is merely the preferred embodiment of illustrative, but not is restricted person.Any spirit and category that does not break away from the utility model, and to its equivalent modifications of carrying out or change, all should be contained in the accompanying claim.
Claims (9)
1. a fixed power led drive unit is characterized in that, is to use a power drives one first light-emitting diode group and one second light-emitting diode group of 110 volts of alternating voltages or 220 volts, and it comprises:
One detection module is to electrically connect this power supply, and the alternating voltage and the dividing potential drop that receive this power supply form a detected value, and this detection module relatively this detected value and a preset value, and when this detected value during less than this preset value, this detection module is exported and joined signal in the lump; When this detected value during greater than this preset value, this detection module is exported a string signal;
One switch module is to be provided with one first switch element and a second switch unit, and this first switch element couples this detection module and this second light-emitting diode group; This second switch unit couples this first switch element and this first light-emitting diode group; When this switch module receives should the parallel connection signal time; This first switch element and this second switch unit are conductings respectively and make this second light-emitting diode group of this first light-emitting diode group parallel connection, and this switch module is exported a low pressure signal; When this switch module receives should the series connection signal time, this first switch element and this second switch unit be respectively by and make this this second light-emitting diode group of first light-emitting diode group series connection, and this switch module is exported a high pressure signal; And
One current control module; Be to electrically connect this switch module, this first light-emitting diode group and this second light-emitting diode group; This current control module has one the 3rd switch element and an impedance unit; When this current control module received this low pressure signal, the 3rd switch element was conducting and the resistance of this impedance unit is dwindled, to form one first operating current; When this current control module receives this high pressure signal, the 3rd switch element be by and the resistance of this impedance unit is increased, to form this second operating current, make this first operating current greater than this second operating current.
2. fixed power led drive unit according to claim 1; It is characterized in that; This current control module has a N type metal oxide semiconductor field-effect transistor and one or three ends can be adjusted pressurizer; The grid of this N type metal oxide semiconductor field-effect transistor is to couple this three end can adjust the anode tap of pressurizer, and couples its drain electrode after being connected in series one first resistance; The drain electrode of this N type metal oxide semiconductor field-effect transistor couples this second light-emitting diode group and this second switch unit; The source electrode of this N type metal oxide semiconductor field-effect transistor couples reference edge and one second resistance that this three end can be adjusted pressurizer; Be connected in series one the 3rd resistance after coupling the 3rd switch element simultaneously, to form this impedance unit by this second resistance and the 3rd resistance.
3. fixed power led drive unit according to claim 2 is characterized in that, when this current control module received this low pressure signal, the 3rd switch element was conducting and make this second resistance parallel connection the 3rd resistance.
4. fixed power led drive unit according to claim 1; It is characterized in that; This detection module is provided with a rectification unit, a partial pressure unit and a detecting unit; This rectification unit couples this power supply and this partial pressure unit, and this detecting unit couples this partial pressure unit and this first switch element.
5. fixed power led drive unit according to claim 4 is characterized in that this detecting unit is that one or three ends can be adjusted pressurizer.
6. fixed power led drive unit according to claim 5 is characterized in that, this preset value can be adjusted the inner fiducial value of pressurizer for this three end, and this fiducial value is 135～145 volts.
7. fixed power led drive unit according to claim 4, wherein this partial pressure unit is to couple this detecting unit through a delay cell.
8. fixed power led drive unit according to claim 4 is characterized in that this first switch element, this second switch unit and the 3rd switch element are an optical coupler, a solid-state relay, an optical relay or a field-effect transistor.
9. fixed power led drive unit according to claim 4 is characterized in that, this first light-emitting diode group is through this second light-emitting diode group of high-voltage diode serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201726996U CN202551453U (en) | 2012-04-20 | 2012-04-20 | Constant Power LED Driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201726996U CN202551453U (en) | 2012-04-20 | 2012-04-20 | Constant Power LED Driver |
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| CN202551453U true CN202551453U (en) | 2012-11-21 |
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| CN2012201726996U Expired - Fee Related CN202551453U (en) | 2012-04-20 | 2012-04-20 | Constant Power LED Driver |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103280193A (en) * | 2013-05-28 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
| CN103687201A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | A constant current drive system for LED light strings |
| CN104918351A (en) * | 2014-03-14 | 2015-09-16 | 陈权霈 | LED light string driving circuit |
| US9271361B2 (en) | 2013-05-28 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving the backlight driving circuit |
| CN103986315B (en) * | 2014-06-10 | 2016-08-17 | 安徽工业大学 | IGBT driven with current sources circuit based on active gate current control mode and control method thereof |
| CN106102258A (en) * | 2016-08-17 | 2016-11-09 | 深圳普益照明科技有限公司 | The AC Driving System of LED light source and driving method |
| CN115035867A (en) * | 2022-07-20 | 2022-09-09 | 绵阳惠科光电科技有限公司 | Backlight driving circuit and method, backlight module and display device |
| US11854501B1 (en) | 2022-07-20 | 2023-12-26 | Mianyang HKC Optoelectronics Technology Co., Ltd. | Backlight driving circut, backlight module and display device |
-
2012
- 2012-04-20 CN CN2012201726996U patent/CN202551453U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280193A (en) * | 2013-05-28 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
| CN103280193B (en) * | 2013-05-28 | 2015-11-25 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit, liquid crystal indicator and backlight driving method |
| US9271361B2 (en) | 2013-05-28 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving the backlight driving circuit |
| CN103687201A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | A constant current drive system for LED light strings |
| CN104918351A (en) * | 2014-03-14 | 2015-09-16 | 陈权霈 | LED light string driving circuit |
| CN103986315B (en) * | 2014-06-10 | 2016-08-17 | 安徽工业大学 | IGBT driven with current sources circuit based on active gate current control mode and control method thereof |
| CN106102258A (en) * | 2016-08-17 | 2016-11-09 | 深圳普益照明科技有限公司 | The AC Driving System of LED light source and driving method |
| CN106102258B (en) * | 2016-08-17 | 2019-03-01 | 深圳普益照明科技有限公司 | The AC Driving System and driving method of LED light source |
| CN115035867A (en) * | 2022-07-20 | 2022-09-09 | 绵阳惠科光电科技有限公司 | Backlight driving circuit and method, backlight module and display device |
| US11854501B1 (en) | 2022-07-20 | 2023-12-26 | Mianyang HKC Optoelectronics Technology Co., Ltd. | Backlight driving circut, backlight module and display device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20140420 |