CN102098855B - Light-emitting diode (LED) driving device - Google Patents
Light-emitting diode (LED) driving device Download PDFInfo
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- CN102098855B CN102098855B CN 201110046445 CN201110046445A CN102098855B CN 102098855 B CN102098855 B CN 102098855B CN 201110046445 CN201110046445 CN 201110046445 CN 201110046445 A CN201110046445 A CN 201110046445A CN 102098855 B CN102098855 B CN 102098855B
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Abstract
The invention discloses a light-emitting diode (LED) driving device. A dimming circuit can be used for dimming an LED module. The LED driving device comprises a rectifier circuit, a voltage transformation circuit, a first control circuit and a stabilizer circuit. When the output voltage of the rectifier circuit is less than a specific value, the stabilizer circuit disables the first control circuit; and when the voltage of the rectifier circuit is more than or equal to the specific value, the stabilizer circuit enables the first control circuit. When the first control circuit is enabled, the output of the voltage transformation circuit is adjusted according to the output of the rectifier circuit so as to drive the LED module. Only when the output voltage of the rectifier circuit is enoughto continuously drive the first control circuit and the LED module at the same time, the stabilizer circuit enables the first control circuit. Therefore, the condition that the LED module at a low conduction angle flashes due to insufficient holding current of the dimming circuit or the control circuit is avoided.
Description
Technical field
The present invention is relevant for a kind of light-emitting diode driving device, more particularly, relevant for a kind of light-emitting diode driving device that comprises stabilizing circuit, with avoid because of the light-emittingdiode module when the low angle of flow because keeping undercurrent, and cause the flicker situation.
Background technology
In prior art, when using AC power to be used as the power supply of luminous load, light emission drive circuit usually needs to see through light adjusting circuit and adjusts the luminous brightness of luminous load.Luminous load for instance, can be the light-emittingdiode module of the light-emittingdiode (Light Emitting Diode, LED) that comprises a plurality of serial connections.
In the design of light adjusting circuit, two-way exchange all can be set trigger three polar bodys (TRIAC).Please refer to Fig. 1, Fig. 1 triggers the schematic diagram of the I-E characteristic of three polar bodys for explanation one two-way interchange.In Fig. 1, Id represents electric current, the Vd that two-way exchange triggers three polar bodys and represents the voltage that two-way exchange triggers three polar bodys.Therefore, as seen from Figure 1, the characteristic that two-way exchange triggers three polar bodys is to be that conducting needs to continue to be supplied to one afterwards and keeps electric current (holding current) triggers three polar bodys to keep this two-way exchange state.In other words, light adjusting circuit need to continue to be supplied to keeps electric current, to keep running.
In general, light adjusting circuit is that design is used to conventional incandescent.Compared to conventional incandescent, light-emittingdiode itself possesses the characteristic characteristic of V-I, along folk prescription to similar with general diode, even to the knee point also no current flows of input voltage.In case input voltage surmounts the knee point, light-emittingdiode is the on state characteristic of ohm.When utilizing light adjusting circuit to adjust the luminous brightness of luminous load, can cause because the load line (load line) of luminous load surpasses the knee-point voltage of light-emittingdiode when the low angle of flow undercurrent of keeping of light adjusting circuit, produce the flicker situation.
Summary of the invention
For above-mentioned technical problem, the present invention discloses a kind of light-emitting diode driving device, and it carries out light modulation by light adjusting circuit.This light-emitting diode driving device comprises rectification circuit, transforming circuit, first control circuit and stabilizing circuit.This rectification circuit is coupled to this light adjusting circuit and AC power.The voltage that this rectification circuit provides according to this AC power is to produce high-voltage DC power supply.This transforming circuit is coupled to this rectification circuit, so that this high-voltage DC power supply is converted to low-voltage dc power supply.This low-voltage dc power supply is in order to drive the light-emittingdiode module.This first control circuit is coupled to this transforming circuit.This first control circuit is adjusted the output of this transforming circuit according to the output of this rectification circuit.This stabilizing circuit has circuit for detecting and second control circuit.This circuit for detecting couples this rectification circuit.This second control circuit couples this first control circuit, and this second control circuit is activation or this first control circuit of disabled optionally.When the high-voltage DC power supply of this rectification circuit output during less than particular value, this this first control circuit of second control circuit disabled, when the voltage of this rectification circuit output during more than or equal to particular value, this this first control circuit of second control circuit activation.
According to light-emitting diode driving device of the present invention, second control circuit comprises the first switch, the first switch and first control circuit couple an end points jointly, this end points couples rectification circuit, and have a specific voltage, and when the voltage of rectification circuit output during less than particular value, the first switch conduction, make this end points ground connection, in order to the disabled first control circuit.Further, stabilizing circuit more comprises first end and second switch.The first end of stabilizing circuit is coupled to rectification circuit and transforming circuit, to receive high-voltage DC power supply.Second switch couples circuit for detecting and the first switch.Wherein circuit for detecting is coupled to the first end of stabilizing circuit, in order to the high-voltage DC power supply dividing potential drop.When the first switch conduction, second switch is closed, when the first switch cuts out, and the second switch conducting.
According to light-emitting diode driving device of the present invention, stabilizing circuit more comprises diode, the first resistance, the second resistance and electric capacity.Diode comprises the anode that is coupled to this end points, and negative electrode.The first resistance comprises the first end of the anode that is coupled to diode, and the second end that is coupled to the first end of the first switch.The second resistance comprises the first end of the negative electrode that is coupled to diode, and the second end that is coupled to the first end of this second switch.Electric capacity comprises the first end of the first end that is coupled to the second resistance, and the second end that is coupled to earth terminal.Wherein the resistance of the second resistance is greater than the first resistance.
According to light-emitting diode driving device of the present invention, circuit for detecting comprises the Zener diode of two series connection, the end points that these two Zener diodes couple mutually is coupled to the control end of second switch, the negative electrode of one of them of these two Zener diodes is coupled to the first end of this stabilizing circuit, and wherein another the anode of these two Zener diodes is coupled to earth terminal.Further, light-emitting diode driving device more comprises diode, and this diode comprises anode and negative electrode, and anode is coupled to this end points, and negative electrode is coupled to transforming circuit, and this diode is used for preventing that current reflux is to rectification circuit.
According to light-emitting diode driving device of the present invention, this end points is coupled to the anode of diode, and the first end of stabilizing circuit is coupled to the negative electrode of diode.
According to light-emitting diode driving device of the present invention, light adjusting circuit is that two-way exchange triggers three polar bodys (TRIAC).
According to light-emitting diode driving device of the present invention, first control circuit is pulse width modulation circuit or frequency conversion modulation circuit.
According to light-emitting diode driving device of the present invention, transforming circuit is reducing transformer.
Stabilizing circuit of the present invention is activation first control circuit when the voltage of rectification circuit output is enough to continue simultaneously to drive first control circuit and light-emittingdiode module only, the flicker situation that can therefore avoid the light-emittingdiode module to produce because keeping undercurrent when the low angle of flow.
Description of drawings
Fig. 1 triggers the schematic diagram of the I-E characteristic of three polar bodys for explanation one two-way interchange.
Fig. 2 is the schematic diagram of an embodiment of explanation light-emitting diode driving device of the present invention.
Fig. 3 is the schematic diagram of another embodiment of explanation light-emitting diode driving device of the present invention.
Embodiment
For making purpose of the present invention, structure, feature and function thereof there are further understanding, hereby cooperate embodiment to be described in detail as follows.
Please refer to Fig. 2.Fig. 2 is the schematic diagram of an embodiment of explanation light-emitting diode driving device 200 of the present invention.As shown in Figure 2, AC power 110 comprises two output O1 and O2, with output AC voltage Vac.Light-emitting diode driving device 200 carries out light modulation by light adjusting circuit 130.Light-emitting diode driving device 200 sees through light adjusting circuit 130, receives the alternating voltage Vac that AC power 110 provides, to drive light-emittingdiode module 600.For instance, AC power 110 provides alternating voltage Vac to light adjusting circuit 130; Light adjusting circuit 130 is adjusted the average voltage level that alternating voltage Vac inputs to light-emitting diode driving device 200, to adjust according to this brightness of light-emittingdiode module 600.Light adjusting circuit 130 comprises two-way exchange and triggers three polar bodys (TRIAC), and the structure of light adjusting circuit 130 and operation principle are industry technology known, do not give unnecessary details in this.Light-emittingdiode module 600 can be realized by the light-emittingdiode of a plurality of serial connections.
Light-emitting diode driving device 200 comprises rectification circuit 206, transforming circuit 208, first control circuit 210 and stabilizing circuit 212.
Transforming circuit 208 is coupled between rectification circuit 206 and the light-emittingdiode module 600, is used for high-voltage DC power supply Vdc_h is converted to suitable light-emittingdiode module 600 employed scopes.For instance, transforming circuit 208 can be reduction voltage circuit or booster circuit, and transforming circuit 208 consists of constant-current circuit with first control circuit 210.In present embodiment, transforming circuit 208 is converted to low-voltage dc power supply Vdc_l to light-emittingdiode module 600 with high-voltage DC power supply Vdc_h, to drive light-emittingdiode module 600.
Light-emitting diode driving device 200 comprises diode Da in addition, is coupled between rectification circuit 206 and the transforming circuit 208, is used for preventing that current reflux is to first control circuit 210.The anode of diode Da is coupled to first control circuit 210, and the negative electrode of diode Da is coupled to transforming circuit 208.In present embodiment, the negative electrode of diode Da is coupled to the first end of filter capacitor Ce in addition, and the second end of filter capacitor Ce is coupled to earth terminal.
The first end E1 of stabilizing circuit 212 is coupled to the negative electrode of diode Da, to receive high-voltage DC power supply Vdc_h.Stabilizing circuit 212 comprises circuit for detecting 212a and second control circuit 212b.Second control circuit 212b is coupled to first control circuit 210, in order to optionally activation or disabled first control circuit 210.Second control circuit 212b comprises the first interrupteur SW 1, the first interrupteur SW 1 and jointly is coupled to end points P with first control circuit 210, and end points P has specific voltage.
Stabilizing circuit 212 comprises second switch SW2, diode Db, the first resistance R 1, the second resistance R 2, capacitor C and two divider resistance R3, R4 in addition.The first interrupteur SW 1 and second switch SW2 can be by N-type metal-oxide-semifield-effect electric crystal (N-type Metal Oxide Semiconductor, NMOS) realize, for instance, the control end of the first interrupteur SW 1 and second switch SW2 is the gate of N-type metal-oxide-semifield-effect electric crystal.Each element couples the pass as shown in Figure 2 in the stabilizing circuit 212; The anode of diode Db is coupled to end points P.The first end of the first resistance R 1 is coupled to the anode of diode Db, and the second end of the first resistance R 1 is coupled to the first end of the first interrupteur SW 1.The first end of the second resistance R 2 is coupled to the negative electrode of diode Db, and the second end of the second resistance R 2 is coupled to the first end of second switch SW2 and the control end of the first interrupteur SW 1.The first end of capacitor C is coupled to the first end of the second resistance R 2, and the second end of capacitor C is coupled to earth terminal.The second termination of the first interrupteur SW 1 and second switch SW2 is coupled to earth terminal.In present embodiment, the second resistance R 2 has high value (for example 12x103 ohm), and the second resistance R 2 only is used as to drive the first interrupteur SW 1, and the resistance of the second resistance R 2 is greater than the resistance of the first resistance R 1, and the first resistance R 1 can be with end points P current potential ground connection.
Circuit for detecting 212a is coupled to rectification circuit 206; More particularly, circuit for detecting 212a is coupled to the negative electrode of diode Da via the first end E1 of stabilizing circuit 212, to receive high-voltage DC power supply Vdc_h.Circuit for detecting comprises Zener diode (zener diodes) Z1, the Z2 of two series connection, and the end points that Zener diode Z1, Z2 couple mutually is coupled to the control end (gate) of second switch SW2.In present embodiment, the voltage of exporting when rectification circuit 206 is during more than or equal to particular value Vb, Zener diode Z1, the Z2 collapse of circuit for detecting 212a is that high-voltage DC power supply Vdc_h carries out dividing potential drop and conducting second switch SW2 with the voltage that rectification circuit 206 is exported.
The spirit of stabilizing circuit 212 of the present invention is to guarantee that voltage that rectification circuit 206 is exported is enough to allow first control circuit 210 have and enough keeps electric current, and can continue simultaneously to drive in the situation of light-emittingdiode module 600, activation first control circuit 210 is to adjust the output of transforming circuit 208.The operation principle of stabilizing circuit 212 of the present invention below will be described.
The voltage of exporting when rectification circuit 206 is during less than particular value Vb, when namely not reaching the breakdown voltage of Zener diode Z1, Z2 of circuit for detecting 212a, circuit for detecting 212a can't carry out dividing potential drop to the high-voltage DC power supply Vdc_h that rectification circuit 206 is exported, not conducting of second switch SW2.The voltage that rectification circuit 206 is exported via end points P and diode Db to capacitor C fill can, and the voltage exported of rectification circuit 206 transfers to the control end of the first interrupteur SW 1 simultaneously via end points P, diode Db and the second resistance R 2, with conducting the first interrupteur SW 1.Because the resistance of the second resistance R 2 is greater than the resistance of the first resistance R 1, therefore after 1 conducting of the first interrupteur SW, the electric current that rectification circuit 206 is exported second resistance R 2 of can't flowing through, but flow to earth terminal via the first interrupteur SW 1.In addition, after 1 conducting of the first interrupteur SW, the voltage that rectification circuit 206 is exported has filled the capacitor C of energy this moment because the obstruct of diode Db makes electric current can not flow to the path of the first resistance R 1 no longer via the second resistance R 2 conductings the first interrupteur SW 1, and therefore the first interrupteur SW 1 can continue conducting.In other words, the voltage of exporting when rectification circuit 206 is during less than particular value Vb, the first interrupteur SW 1 conducting and second switch SW2 closes, the electricity of rectification circuit 206 outputs flow to earth terminal via end points P, the first resistance R 1 and the first interrupteur SW 1, so the current potential ground connection of end points P, first control circuit 210 can't be enabled.
When the voltage of exporting when rectification circuit 206 was equal to or greater than particular value Vb, the high-voltage DC power supply Vdc_h that Zener diode Z1, the Z2 of circuit for detecting 212a export rectification circuit 206 carried out dividing potential drop, and conducting second switch SW2 according to this.When second switch SW2 conducting, the electric current of all second resistance R 2 of flowing through all can flow to earth terminal via second switch SW2, and therefore the first interrupteur SW 1 can't be enabled.In other words, when the voltage of exporting when rectification circuit 206 is equal to or greater than particular value Vb, second switch SW2 conducting and the first interrupteur SW 1 is closed, the electric current that rectification circuit 206 is exported transfers to first control circuit 210 via end points P, with activation first control circuit 210.So, adjust the output of transforming circuit 208 after first control circuit 210 activations according to the output of rectification circuit 206, to drive light-emittingdiode module 600.
So, if the voltage that rectification circuit 206 is exported is not sufficient to continue simultaneously to drive first control circuit 210 and light-emittingdiode module 600, when namely the voltage exported of rectification circuit 206 is less than particular value Vb, even if the voltage of rectification circuit 206 outputs is enough to drive first control circuit 210 or light-emittingdiode module 600, stabilizing circuit 212 can't activation first control circuit 210.When the voltage of only exporting at rectification circuit 206 is enough to continue simultaneously to drive first control circuit 210 and light-emittingdiode module 600, when namely the voltage exported of rectification circuit 206 was more than or equal to particular value Vb, stabilizing circuit 212 is activation first control circuits 210.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of an embodiment of explanation light-emitting diode driving device 300 of the present invention.Light-emitting diode driving device 300 is similar in appearance to the light-emitting diode driving device 200 of Fig. 2, different is, light-emitting diode driving device 300 comprises filter circuit 204 in addition, be coupled between light adjusting circuit 130 and the rectification circuit 206, in order to the electromagnetic interference of the alternating voltage Vac that eliminates light adjusting circuit 130 output.As shown in Figure 3, filter circuit 204 comprises the first capacitor C a and the second capacitor C b.First, second end of the first capacitor C a is respectively coupled to first, second end of the second capacitor C b.The first end of the first capacitor C a and the second capacitor C b is coupled to the input I1 of light adjusting circuit 130 and rectification circuit 206, and the second end of the first capacitor C a and the second capacitor C b is coupled to the output O2 of AC power 110 and the input I2 of rectification circuit 206.The structure of filter circuit 204 and operation principle are the technology that industry is familiar with, and in Fig. 3, the filter circuit 204 of being implemented take the first capacitor C a and the second capacitor C b is only as an embodiment, and non-limiting protection scope of the present invention.
In sum, by the stabilizing circuit of light emission drive circuit provided by the present invention, can be according to the voltage of rectification circuit output, optionally activation or disabled first control circuit are to drive the light-emittingdiode module.Stabilizing circuit of the present invention is activation first control circuit when the voltage of rectification circuit output is enough to continue simultaneously to drive first control circuit and light-emittingdiode module only.So, can avoid because of light-emittingdiode module undercurrent of keeping because of light adjusting circuit or control circuit when hanging down the angle of flow, and the flicker situation that produces.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that the embodiment that has disclosed does not limit the scope of the invention.On the contrary, the change of doing without departing from the spirit and scope of the present invention and retouching all belong to scope of patent protection of the present invention.
Claims (10)
1. light-emitting diode driving device, it carries out light modulation by light adjusting circuit, it is characterized in that this light-emitting diode driving device comprises:
Rectification circuit is coupled to this light adjusting circuit and AC power, and the alternating voltage that this rectification circuit provides according to this AC power is to produce high-voltage DC power supply;
Transforming circuit is coupled to this rectification circuit, and this high-voltage DC power supply is converted to low-voltage dc power supply, and this low-voltage dc power supply is in order to drive the light-emittingdiode module;
First control circuit is coupled to this transforming circuit, and this first control circuit is adjusted the output of this transforming circuit according to the output of this rectification circuit; And
Stabilizing circuit has circuit for detecting and second control circuit, and this circuit for detecting couples this rectification circuit, and this second control circuit couples this first control circuit, and this second control circuit is activation or this first control circuit of disabled optionally;
When the voltage of this rectification circuit output during less than particular value, this this first control circuit of second control circuit disabled, when the voltage of this rectification circuit output during more than or equal to particular value, this this first control circuit of second control circuit activation.
2. light-emitting diode driving device as claimed in claim 1, it is characterized in that this second control circuit comprises the first switch, this first switch and this first control circuit couple an end points jointly, this end points couples this rectification circuit, and have a specific voltage, and when the voltage of rectification circuit output during less than particular value, this first switch conduction, make this end points ground connection, in order to this first control circuit of disabled.
3. light-emitting diode driving device as claimed in claim 2 is characterized in that this stabilizing circuit more comprises:
The first end of stabilizing circuit is coupled to this rectification circuit and this transforming circuit, to receive this high-voltage DC power supply; And
Second switch couples this circuit for detecting and this first switch;
Wherein this circuit for detecting is coupled to the first end of this stabilizing circuit, in order to this high-voltage DC power supply dividing potential drop;
Wherein when the first switch conduction, this second switch is closed, when the first switch cuts out, and this second switch conducting.
4. light-emitting diode driving device as claimed in claim 3 is characterized in that this stabilizing circuit more comprises:
Diode comprises the anode that is coupled to this end points, and negative electrode;
The first resistance comprises the first end of the anode that is coupled to this diode, and the second end that is coupled to the first end of this first switch;
The second resistance comprises the first end of the negative electrode that is coupled to this diode, and the second end that is coupled to the first end of this second switch; And
Electric capacity comprises the first end of the first end that is coupled to this second resistance, and the second end that is coupled to earth terminal;
Wherein the resistance of this second resistance is greater than this first resistance.
5. light-emitting diode driving device as claimed in claim 3, it is characterized in that this circuit for detecting comprises the Zener diode of two series connection, the end points that these two Zener diodes couple mutually is coupled to the control end of this second switch, the negative electrode of one of them of these two Zener diodes is coupled to the first end of this stabilizing circuit, and wherein another the anode of these two Zener diodes is coupled to earth terminal.
6. light-emitting diode driving device as claimed in claim 5, it is characterized in that more comprising: diode, this diode comprises anode and negative electrode, and this anode is coupled to this end points, this negative electrode is coupled to this transforming circuit, and this diode is used for preventing that current reflux is to this rectification circuit.
7. light-emitting diode driving device as claimed in claim 6 it is characterized in that this end points is coupled to the anode of this diode, and the first end of this stabilizing circuit is coupled to the negative electrode of this diode.
8. light-emitting diode driving device as claimed in claim 1 is characterized in that this light adjusting circuit is that two-way exchange triggers three polar bodys.
9. light-emitting diode driving device as claimed in claim 1 is characterized in that this first control circuit is pulse width modulation circuit or frequency conversion modulation circuit.
10. light-emitting diode driving device as claimed in claim 1 is characterized in that this transforming circuit is reducing transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110046445 CN102098855B (en) | 2011-02-20 | 2011-02-20 | Light-emitting diode (LED) driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110046445 CN102098855B (en) | 2011-02-20 | 2011-02-20 | Light-emitting diode (LED) driving device |
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| CN102098855A CN102098855A (en) | 2011-06-15 |
| CN102098855B true CN102098855B (en) | 2013-10-23 |
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| CN 201110046445 Active CN102098855B (en) | 2011-02-20 | 2011-02-20 | Light-emitting diode (LED) driving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI584099B (en) * | 2016-04-06 | 2017-05-21 | 普誠科技股份有限公司 | Current control circuits |
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| CN103298189B (en) * | 2012-03-01 | 2018-01-19 | 欧司朗股份有限公司 | Lighting device |
| TWI477198B (en) * | 2012-04-20 | 2015-03-11 | Champion Elite Co Ltd | Dimming circuit |
| TWI496504B (en) * | 2013-04-26 | 2015-08-11 | Unity Opto Technology Co Ltd | Variable power dimming control circuit |
| CN106105400B (en) * | 2014-03-11 | 2018-09-07 | 松下知识产权经营株式会社 | Light modulating device |
| CN104992674A (en) | 2015-07-24 | 2015-10-21 | 上海和辉光电有限公司 | Pixel compensation circuit |
| CN105451391B (en) * | 2015-12-17 | 2017-11-17 | 盐城工学院 | A kind of LED drive circuit and light fixture |
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| CN101605416A (en) * | 2008-06-13 | 2009-12-16 | 登丰微电子股份有限公司 | LED driving circuit and controller thereof |
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
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| GB2435724A (en) * | 2006-03-04 | 2007-09-05 | Mood Concepts Ltd | TRIAC dimming of LED lighting units |
| CN101605416A (en) * | 2008-06-13 | 2009-12-16 | 登丰微电子股份有限公司 | LED driving circuit and controller thereof |
| CN101965074A (en) * | 2009-07-22 | 2011-02-02 | 立锜科技股份有限公司 | Drive circuit and method for driving load |
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