CN201509346U - LED power supply device capable of fixing maximum and minimum brightness - Google Patents
LED power supply device capable of fixing maximum and minimum brightness Download PDFInfo
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- CN201509346U CN201509346U CN2009202499292U CN200920249929U CN201509346U CN 201509346 U CN201509346 U CN 201509346U CN 2009202499292 U CN2009202499292 U CN 2009202499292U CN 200920249929 U CN200920249929 U CN 200920249929U CN 201509346 U CN201509346 U CN 201509346U
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Abstract
The utility model discloses an LED power supply device capable of fixing the maximum and minimum brightness, which is applied to a TRIAC light modulator and at least one LED. The LED power supply device capable of fixing the maximum and minimum brightness comprises a light modulating circuit, an input voltage detector, a feedback circuit, a DC-to-DC converter and a rectifier, wherein the light modulating circuit outputs a reference voltage, the reference voltage can ensure that the LED can maintain the fixed maximum brightness when a conducting angle of the TRIAC light modulator is too large, and the reference voltage can also ensure that the LED can maintain the fixed minimum brightness when the conducting angle of the TRIAC light modulator is too small.
Description
Technical field
The utility model relates to a kind of LED power source feeding mechanism, particularly a kind of LED power source feeding mechanism of fixing maximum and minimum brightness.
Background technology
Please refer to Fig. 6, it is known LED power source feeding mechanism calcspar.This known LED power source feeding mechanism 100A is applied to an AC power 10A, a triac dimmable device 20A and at least one light-emitting diode 50A.This triac dimmable device 20A is electrically connected to this AC power 10A.This LED power source feeding mechanism 100A is electrically connected to this triac dimmable device 20A and this light-emitting diode 50A.
This LED power source feeding mechanism 100A comprises a full-wave rectifier 30A, a DC-to-DC converter 40A, an input voltage detector 60A, a feedback circuit 70A and a dim signal generator 80A.This full-wave rectifier 30A is electrically connected to this triac dimmable device 20A, this DC-to-DC converter 40A and this input voltage detector 60A.This feedback circuit 70A is electrically connected to this DC-to-DC converter 40A, this dim signal generator 80A and this light-emitting diode 50A.This light-emitting diode 50A is electrically connected to this DC-to-DC converter 40A and this feedback circuit 70A.This dim signal generator 80A is electrically connected to this feedback circuit 70A and this input voltage detector 60A.
This input voltage detector 60A can produce a direct current voltage V1, and after this direct voltage V1 handled through this dim signal generator 80A, this dim signal generator 80A sent a dim signal S1.This dim signal S1 is directly proportional with the angle of flow size of this triac dimmable device 20A: the angle of flow is big more, and then this dim signal S1 is big more; The angle of flow is more little, and then this dim signal S1 is more little.Therefore, this triac dimmable device 20A difference of different manufacturers manufacturing, thus angle of flow difference, this dim signal S1 difference.Therefore will cause this light-emitting diode 50A difference to some extent when maximum and minimum brightness.
Wherein, the AC supply voltage waveform of this AC power 10A behind this triac dimmable device 20A as shown in Figure 5.
The utility model content
For solving the shortcoming of above-mentioned known technology, the purpose of this utility model is to provide a kind of LED power source feeding mechanism maximum and minimum brightness of fixing.
For realizing above-mentioned purpose of the present utility model, the LED power source feeding mechanism of fixing maximum and minimum brightness of the present utility model is applied to a triac dimmable device and at least one light-emitting diode.This can be fixed maximum LED power source feeding mechanism with minimum brightness and comprise: a light adjusting circuit; One input voltage detector is electrically connected to this light adjusting circuit; One feedback circuit is electrically connected to this light adjusting circuit and this light-emitting diode; One DC-to-DC converter is electrically connected to this input voltage detector, this feedback circuit and this light-emitting diode; And a rectifier, be electrically connected to this input voltage detector, this DC-to-DC converter and this triac dimmable device.Wherein this light adjusting circuit receives a direct current voltage of this input voltage detector output and exports a reference voltage to this feedback circuit.After this feedback circuit received this reference voltage, the angle of flow that can guarantee this triac dimmable device was when excessive, and this light-emitting diode can keep a fixing high-high brightness; And the angle of flow of guaranteeing this triac dimmable device is when too small, and this light-emitting diode can keep a fixing minimum brightness.
Description of drawings
Fig. 1 is the LED power source feeding mechanism calcspar of fixing maximum and minimum brightness of the present utility model;
Fig. 2 is an embodiment line map (impulse width modulation and light adjusting signal generator) of the first of light adjusting circuit of the present utility model;
Fig. 3 is an embodiment line map of the second portion of light adjusting circuit of the present utility model;
Fig. 4 is the triangular wave oscillogram of the non-inverting input of first operational amplifier;
Fig. 5 is the output voltage waveform of known triac dimmable device;
Fig. 6 is known LED power source feeding mechanism calcspar.
Wherein, Reference numeral
AC power 10 triac dimmable devices 20
Rectifier 30 DC-to-DC converter 40
Light-emitting diode 50 input voltage detectors 60
Can fix light-emitting diode reference voltage Vref maximum and minimum brightness
The direct voltage Vdim first operational amplifier U1
The second operational amplifier U2, first resistance R 36
The 4th resistance R 26 the 5th resistance R 27
First capacitor C, 5 impulse width modulation and light adjusting signal S2
Reverser 95 low pass filters 93
The 7th resistance 96 the 8th resistance 98
Reverse impulse width modulation and light adjusting signal S2 dimmer voltage Vs
Bucking voltage Vd operating voltage Vcc
Voltage minimum Vu voltage peak Vh
Angle of flow A1 AC power 10A
Triac dimmable device 20A full-wave rectifier 30A
DC-to-DC converter 40A light-emitting diode 50A
Direct voltage V1 dim signal S1
Embodiment
Please refer to Fig. 1, it is the LED power source feeding mechanism calcspar of fixing maximum and minimum brightness of the present utility model.The LED power source feeding mechanism 100 of fixing maximum and minimum brightness of the present utility model is applied to an AC power 10, a triac dimmable device 20 and at least one light-emitting diode 50.This triac dimmable device 20 is electrically connected to this AC power 10.This can be fixed maximum LED power source feeding mechanism 100 with minimum brightness and be electrically connected to this triac dimmable device 20 and this light-emitting diode 50.
This can be fixed maximum LED power source feeding mechanism 100 with minimum brightness and comprise: a light adjusting circuit 80, a feedback circuit 70, an input voltage detector 60, a DC-to-DC converter 40 and a rectifier 30.This rectifier 30 is electrically connected to this input voltage detector 60, this DC-to-DC converter 40 and this triac dimmable device 20.This light adjusting circuit 80 is electrically connected to this input voltage detector 60 and this feedback circuit 70.This feedback circuit 70 is electrically connected to this light adjusting circuit 80, this DC-to-DC converter 40 and this light-emitting diode 50.This light-emitting diode 50 is electrically connected to this DC-to-DC converter 40 and this feedback circuit 70.
Please refer to Fig. 2, it is an embodiment line map (impulse width modulation and light adjusting signal generator) of the first of light adjusting circuit of the present utility model.This light adjusting circuit 80 comprises one first operational amplifier U1, one second operational amplifier U2, one first resistance R 36, one second resistance R 4, one the 3rd resistance R 23, one the 4th resistance R 26, one the 5th resistance R 27 and one first capacitor C 5.
The non-inverting input of this first operational amplifier U1 is electrically connected to the non-inverting input of this second operational amplifier U2.The reverse input end of this second operational amplifier U2 is electrically connected to this input voltage detector 60.One end of this first resistance R 36 is electrically connected to 12 volts of voltages, and the other end is electrically connected to the output of this first operational amplifier U1.One end of this second resistance R 4 is electrically connected to the output of this first operational amplifier U1, and the other end is electrically connected to the non-inverting input of this first operational amplifier U1.One end of the 3rd resistance R 23 is electrically connected to the output of this first operational amplifier U1, and the other end is electrically connected to the reverse input end of this first operational amplifier U1.One end of the 4th resistance R 26 is electrically connected to 12 volts of voltages, and the other end is electrically connected to the reverse input end of this first operational amplifier U1.One end ground connection of the 5th resistance R 27, the other end is electrically connected to the reverse input end of this first operational amplifier U1.One end ground connection of this first capacitor C 5, the other end is electrically connected to the non-inverting input of this first operational amplifier U1.
Please refer to Fig. 3, it is an embodiment line map of the second portion of light adjusting circuit of the present utility model.This light adjusting circuit 80 more comprises a low pass filter 93, a reverser 95, a voltage follower (Voltage-follower) 92, one the 6th resistance 94, one the 7th resistance 96 and one the 8th resistance 98.One end of the 6th resistance 94 is electrically connected to the output of this voltage follower 92, and the other end is electrically connected to a bucking voltage Vd.One end of the 7th resistance 96 is electrically connected to the output of this voltage follower 92, and the other end is electrically connected to this feedback circuit 70.One end of the 8th resistance 98 is electrically connected to the output of this voltage follower 92, other end ground connection.The non-inverting input of this voltage follower 92 is electrically connected to this low pass filter 93.This reverser 95 is electrically connected to output and this low pass filter 93 of this second operational amplifier U2.Even this voltage follower 92 is electrically connected between an operating voltage Vcc and the ground connection.
The motion flow of fixing the LED power source feeding mechanism of maximum and minimum brightness of the present utility model below will be described, please also refer to Fig. 1, Fig. 2 and Fig. 3.
Main notion of fixing the LED power source feeding mechanism of maximum and minimum brightness of the present utility model is: this light adjusting circuit 80 outputs one reference voltage Vref; After this feedback circuit 70 receives this reference voltage Vref, it is luminous that this DC-to-DC converter 40 and this feedback circuit 70 drive this light-emitting diode 50, the angle of flow that can guarantee this triac dimmable device 20 is when excessive, and this light-emitting diode 50 can keep a fixing high-high brightness; After this feedback circuit 70 receives this reference voltage Vref, it is luminous that this DC-to-DC converter 40 and this feedback circuit 70 drive this light-emitting diode 50, the angle of flow that can guarantee this triac dimmable device 20 is when too small, and this light-emitting diode 50 can keep a fixing minimum brightness.Now details are as follows:
The configuration of this first operational amplifier U1 is a hysteresis comparator, and the non-inverting input of this first operational amplifier U1 can get a triangular wave, as shown in Figure 4.This triangular wave is electrically connected with the non-inverting input of this second operational amplifier U2.The direct current voltage Vdim that this input voltage detector 60 is sent then is electrically connected to the reverse input end of this second operational amplifier U2.After this triangular wave and this direct voltage Vdim handle relatively by this second operational amplifier U2, can get an impulse width modulation and light adjusting signal S2, and be sent to this reverser 95, after oppositely, get a reverse impulse width modulation and light adjusting signal S2, this reverse impulse width modulation and light adjusting signal S2 is sent to this low pass filter 93, the non-inverting input that can get a dimmer voltage Vs and be sent to this voltage follower 92 after this low pass filter 93 is handled.
When the magnitude of voltage of this direct voltage Vdim is changed to a voltage peak Vh by a voltage minimum Vu, the duty ratio (Duty) of this impulse width modulation and light adjusting signal S2 is changed to 0% by 100%, and output current is maximum by minimum change.For instance, when the angle of flow when 90 spend, this direct voltage Vdim is 2V, 120 Vdim of this direct voltage when spending are 4V, are changed to dimming scope if set this angle, this voltage minimum Vu and this voltage peak Vh just need design at 2V and 4V.And the 3rd resistance R 23, the 4th resistance R 26 and the 5th resistance R 27 can determine this voltage minimum Vu of this triangular wave and the numerical value of this voltage peak Vh.Arithmetic expression is then as follows:
By the overlapping networking of this bucking voltage Vd and the 6th resistance 94, the 7th resistance 96 and the 8th resistance 98, this initial reference voltage Vref when start can be provided.The characteristic of this voltage follower 92 is that output voltage can equal non-inverting input voltage.As the VOH (maximum output voltage) of non-inverting input voltage greater than this voltage follower 92, then output voltage can maintain VOH; As the VOL (minimum output voltage) of non-inverting input voltage less than this voltage follower 92, then output voltage can maintain VOL.That is to say that output voltage maximum and minimum value can not exceed a preset range (the foregoing description is between VOH and VOL).
This light adjusting circuit 80 transmit these reference voltage Vref to this feedback circuit 70 to determine to export at last the size of current of this light-emitting diode 50.As the VOH of this dimmer voltage Vs greater than this voltage follower 92, then output voltage can maintain VOH, can guarantee the angle of flow if still can keep same brightness when excessive.As the VOL of this dimmer voltage Vs less than this voltage follower 92, then output voltage can maintain VOL, can guarantee the angle of flow if still can keep same brightness when too small.
If the minimum brightness that must be maintained fixed, then this rectifier 30 is necessary for half-wave rectifier, because full-wave rectifier can cause shutdown when the angle of flow is too small, can't keep fixing minimum brightness.
Therefore, define the angle of flow of minimum and high-high brightness after, can obtain corresponding this direct voltage Vdim by this input voltage detector 60.According to this direct voltage Vdim excursion and above-mentioned arithmetic expression, design the resistance of the 3rd resistance R 23, the 4th resistance R 26 and the 5th resistance R 27, and this voltage follower 92 of arranging in pairs or groups, just can in the definition angle of flow, accomplish the variation of output-current rating 1%～100%.So, promptly can avoid angle of flow difference, and cause maximum and minimum brightness difference to some extent because of this triac dimmable device 20 of different manufacturers manufacturing.
Maximum and the required angle of flow of minimum brightness that the utility model definable is fixing when the angle of flow of the triac dimmable device angle less than definition, can be fixed the minimum brightness of exporting; Greater than the angle of definition, can fix maximum output brightness.
The use of the light adjusting circuit technology of fixed maximum that the utility model proposed and minimum brightness, solve arrange in pairs or groups different triac dimmable devices of LED power source supply and can't fix shortcoming maximum and minimum brightness, and realize dimming scope, and increase the adjustability of LED power source supply brightness by 1%～100% variation.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (6)
1. can fix LED power source feeding mechanism maximum and minimum brightness for one kind, be applied to a triac dimmable device and at least one light-emitting diode, it is characterized in that this can be fixed maximum LED power source feeding mechanism with minimum brightness and comprise:
One light adjusting circuit;
One input voltage detector is electrically connected to this light adjusting circuit;
One feedback circuit is electrically connected to this light adjusting circuit and this light-emitting diode;
One DC-to-DC converter is electrically connected to this input voltage detector, this feedback circuit and this light-emitting diode; And
One rectifier is electrically connected to this input voltage detector, this DC-to-DC converter and this triac dimmable device,
Wherein this light adjusting circuit receives a direct current voltage of this input voltage detector output and exports a reference voltage to this feedback circuit, after this feedback circuit receives this reference voltage, the angle of flow that can guarantee this triac dimmable device is when excessive, and this light-emitting diode can keep a fixing high-high brightness; And the angle of flow of guaranteeing this triac dimmable device is when too small, and this light-emitting diode can keep a fixing minimum brightness.
2. the LED power source feeding mechanism of fixing maximum and minimum brightness as claimed in claim 1, it is characterized in that, this light adjusting circuit comprises an impulse width modulation and light adjusting signal generator and a low pass filter, this impulse width modulation and light adjusting signal generator is electrically connected to this low pass filter, after this impulse width modulation and light adjusting signal generator receives this direct voltage of this input voltage detector output, obtain an impulse width modulation and light adjusting signal, and being sent to this low pass filter, this low pass filter produces this reference voltage again and is sent to this feedback circuit after handling.
3. the LED power source feeding mechanism of fixing maximum and minimum brightness as claimed in claim 2, it is characterized in that, this light adjusting circuit also comprises one first operational amplifier and one second operational amplifier, the non-inverting input of this first operational amplifier is electrically connected to the non-inverting input of this second operational amplifier, and the reverse input end of this second operational amplifier is electrically connected to this input voltage detector.
4. the LED power source feeding mechanism of fixing maximum and minimum brightness as claimed in claim 3 is characterized in that this light adjusting circuit also comprises:
One voltage follower, the non-inverting input of this voltage follower is electrically connected to the output of this second operational amplifier; And
One reverser, this reverser are electrically connected to output and this low pass filter of this second operational amplifier,
Wherein, the non-inverting input of this first operational amplifier obtains a triangular wave, after this triangular wave and this direct voltage are handled relatively by this second operational amplifier, obtain this impulse width modulation and light adjusting signal, and be sent to this reverser, after oppositely, get a reverse impulse width modulation and light adjusting signal, this reverse impulse width modulation and light adjusting signal is sent to this low pass filter, this low pass filter is handled the non-inverting input that the back obtains a dimmer voltage and is sent to this voltage follower, produces this reference voltage again and is sent to this feedback circuit.
5. the LED power source feeding mechanism of fixing maximum and minimum brightness as claimed in claim 4 is characterized in that this light adjusting circuit also comprises:
One first resistance, an end of this first resistance is electrically connected to 12 volts of voltages, and the other end is electrically connected to the output of this first operational amplifier;
One second resistance, an end of this second resistance is electrically connected to the output of this first operational amplifier, and the other end is electrically connected to the non-inverting input of this first operational amplifier;
One the 3rd resistance, an end of the 3rd resistance is electrically connected to the output of this first operational amplifier, and the other end is electrically connected to the reverse input end of this first operational amplifier;
One the 4th resistance, an end of the 4th resistance is electrically connected to 12 volts of voltages, and the other end is electrically connected to the reverse input end of this first operational amplifier;
One the 5th resistance, an end ground connection of the 5th resistance, the other end is electrically connected to the reverse input end of this first operational amplifier; And
One first electric capacity, an end ground connection of this first electric capacity, the other end is electrically connected to the non-inverting input of this first operational amplifier.
6. the LED power source feeding mechanism of fixing maximum and minimum brightness as claimed in claim 5 is characterized in that this light adjusting circuit also comprises:
One the 6th resistance, an end of the 6th resistance is electrically connected to the output of this voltage follower, and the other end is electrically connected to a bucking voltage;
One the 7th resistance, an end of the 7th resistance is electrically connected to the output of this voltage follower, and the other end is electrically connected to this feedback circuit;
One the 8th resistance, an end of the 8th resistance is electrically connected to the output of this voltage follower, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202499292U CN201509346U (en) | 2009-10-23 | 2009-10-23 | LED power supply device capable of fixing maximum and minimum brightness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202499292U CN201509346U (en) | 2009-10-23 | 2009-10-23 | LED power supply device capable of fixing maximum and minimum brightness |
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| CN201509346U true CN201509346U (en) | 2010-06-16 |
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| CN2009202499292U Expired - Fee Related CN201509346U (en) | 2009-10-23 | 2009-10-23 | LED power supply device capable of fixing maximum and minimum brightness |
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Cited By (7)
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| CN102143638A (en) * | 2011-04-08 | 2011-08-03 | 杭州矽力杰半导体技术有限公司 | Silicon-controlled light-dimming circuit, light-dimming method and LED (light-emitting diode) driver applying the same |
| CN102625520A (en) * | 2011-01-31 | 2012-08-01 | 美高森美股份有限公司-模拟混合信号集团有限公司 | User control of an led luminaire for a phase cut dimmer |
| CN103200744A (en) * | 2011-04-08 | 2013-07-10 | 矽力杰半导体技术(杭州)有限公司 | Silicon controlled rectifier dimming circuit, silicon controlled rectifier dimming method and light emitting diode (LED) driver applied silicon controlled rectifier dimming circuit and silicon controlled rectifier dimming method |
| CN103379713A (en) * | 2012-04-20 | 2013-10-30 | 金威贸易有限公司 | Light modulation circuit |
| CN103874276A (en) * | 2012-12-07 | 2014-06-18 | 东芝照明技术株式会社 | Power supply circuit and illumination device |
| WO2014121661A1 (en) * | 2013-02-08 | 2014-08-14 | 东林科技股份有限公司 | Dimmable light-emitting diode illumination system |
| CN104902609A (en) * | 2014-03-04 | 2015-09-09 | 上海酷蓝电子科技有限公司 | Segmented linear constant current drive circuit constant power control circuit |
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Cited By (13)
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| CN102625520A (en) * | 2011-01-31 | 2012-08-01 | 美高森美股份有限公司-模拟混合信号集团有限公司 | User control of an led luminaire for a phase cut dimmer |
| CN103200744A (en) * | 2011-04-08 | 2013-07-10 | 矽力杰半导体技术(杭州)有限公司 | Silicon controlled rectifier dimming circuit, silicon controlled rectifier dimming method and light emitting diode (LED) driver applied silicon controlled rectifier dimming circuit and silicon controlled rectifier dimming method |
| US8736185B2 (en) | 2011-04-08 | 2014-05-27 | Sileroy Semiconductor Technology (Hangzhou) Ltd. | SCR dimming circuit and method |
| CN102143638A (en) * | 2011-04-08 | 2011-08-03 | 杭州矽力杰半导体技术有限公司 | Silicon-controlled light-dimming circuit, light-dimming method and LED (light-emitting diode) driver applying the same |
| CN103200744B (en) * | 2011-04-08 | 2015-05-13 | 矽力杰半导体技术(杭州)有限公司 | Silicon controlled rectifier dimming circuit, dimming method and light emitting diode (LED) driver applied silicon controlled rectifier dimming circuit |
| US9055629B2 (en) | 2011-04-08 | 2015-06-09 | Silergy Semiconductor Technology (Hangzhou) Ltd | SCR dimming circuit and method |
| CN103379713B (en) * | 2012-04-20 | 2016-05-18 | 金威贸易有限公司 | Light modulation circuit |
| CN103379713A (en) * | 2012-04-20 | 2013-10-30 | 金威贸易有限公司 | Light modulation circuit |
| CN103874276A (en) * | 2012-12-07 | 2014-06-18 | 东芝照明技术株式会社 | Power supply circuit and illumination device |
| CN103874276B (en) * | 2012-12-07 | 2018-04-20 | 东芝照明技术株式会社 | Power circuit and lighting device |
| WO2014121661A1 (en) * | 2013-02-08 | 2014-08-14 | 东林科技股份有限公司 | Dimmable light-emitting diode illumination system |
| CN104902609A (en) * | 2014-03-04 | 2015-09-09 | 上海酷蓝电子科技有限公司 | Segmented linear constant current drive circuit constant power control circuit |
| CN104902609B (en) * | 2014-03-04 | 2019-04-05 | 上海酷蓝电子科技有限公司 | A kind of control circuit of piece-wise linear constant-current drive circuit firm power |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100616 Termination date: 20111023 |