CN102858047A - AC/DC (alternating current/direct current) common-ground illumination drive circuit - Google Patents
AC/DC (alternating current/direct current) common-ground illumination drive circuit Download PDFInfo
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- CN102858047A CN102858047A CN2011101786450A CN201110178645A CN102858047A CN 102858047 A CN102858047 A CN 102858047A CN 2011101786450 A CN2011101786450 A CN 2011101786450A CN 201110178645 A CN201110178645 A CN 201110178645A CN 102858047 A CN102858047 A CN 102858047A
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Abstract
The invention discloses an AC/DC (alternating current/direct current) common-ground illumination drive circuit which is used for driving a luminous unit, receiving the external power through an input unit and converting the power through a conversion unit connected with the input unit to form switch power, wherein the output switch power drives the luminous unit through an output unit; and the reference potential of the luminous unit can be directly connected to the reference potential of the external power so as to avoid electric shock when a user directly touches the switch power of the luminous unit.
Description
Technical field
The present invention relates to a kind of illumination driving circuit, altogether formula illumination driving circuit of a alternating current-direct current that the alterating and direct current with common ground reference edge drives luminescence unit particularly is provided.
Background technology
Traditionally, be that mode by alternating current directly drives lighting filament.Yet along with the green consciousness that can subtract carbon is surging gradually, the environment-friendly type lighting device also is used thereupon in large quantities, for example the lighting device take light-emitting diode as light emitting source.
But the type of drive of traditional light-emitting diode can directly not utilize alternating current to drive like traditional filament, but carries out the driving in lamp source in the direct current mode.Therefore very different from the drive circuit of traditional lighting filament in the design of the drive circuit of this light-emitting diode.Moreover, in order to be suitable for present electric power presentation mode (for example alternating current), need to before the lighting device that drives this luminous diode, carry out in advance first the conversion of this electric power, just now can be in order to drive the lighting device of this luminous diode, for example alternating current is converted to direct current.
Present illumination Driving technique adopts the AC/DC electrical switching device to drive light emitting diode illuminating apparatus, but the reference potential of light-emitting diode assembly is different from the AC power current potential in this technology, therefore in this technology might so that the user in the process that this lighting device is installed or because of its aging circuit and the factor that comes off etc., the harm that might cause the user to get an electric shock.
Therefore have a kind of invention need to be proposed can be in order to solving the disappearance of prior art, and then reach safely and the effect that lighting apparatus is installed reliably.
Summary of the invention
A purpose of the present invention provides altogether formula illumination driving circuit of a kind of alternating current-direct current, provide power supply with ground connection jointly and conversion electric power after conversion to convert AC power to a conversion electric power in order to drive luminescence unit, this AC power is connected to identical reference potential with this conversion electric power, in order to reach the effect that can avoid equally high pressure to get an electric shock with isolated form conversion topologies framework.
Another object of the present invention is according to above-mentioned illumination driving circuit, can be in the situation that powered-down not, and directly carry out the replacing of luminescence unit and do not have the harm of electric shock.
For reaching above-mentioned purpose and other purpose, the present invention is altogether formula illumination driving circuit of a kind of alternating current-direct current, is used for driving luminescence unit, and it comprises input unit, converting unit, control unit and output unit.This input unit is for being connected with an outside AC power and receiving this AC power; This converting unit is connected with this input unit, be used for this AC power of conversion to form a conversion electric power, this control unit has control end and detecting back coupling end, the feedback signal generation that this control end is used for these detecting back coupling termination receipts has the control signal of controllable operation work period, and wherein this control signal is controlled this converting unit; And this output unit connects this converting unit and this control unit, is used for this feedback signal of output to this detecting back coupling end and transmits this conversion electric power to drive this luminescence unit.
During enforcement, more comprise: a filter unit is arranged between described input unit and the described converting unit.
During enforcement, described converting unit has a plurality of commutation circuits, and these a plurality of commutation circuits be buck change-over circuit or step-down/up type change-over circuit one of them, these a plurality of commutation circuits are jointly used an inductance again.
During enforcement, described control unit is pulse width modulation circuit, and this can control this control signal of work period for generation of control.
During enforcement, described output unit more comprises a capacitor and a detecting resistance, and this capacitor is for this conversion electric power filtering and should supply to produce this feedback signal by detecting resistance.
During enforcement, described converting unit is connected to an end of this luminescence unit, and an end of described detecting resistance is connected in series to the other end of described luminescence unit, and the other end of described detecting resistance is connected with the earth.
During enforcement, described Parallel-connected Capacitor ground connects described luminescence unit and described detecting resistance.
Compare with prior art, alternating current-direct current of the present invention altogether formula illumination driving circuit has alterating and direct current feature altogether simultaneously, so that can have identical reference potential from the alternating current of civil power with the conversion electric power of changing through converting unit, can be in order to avoid when the power circuit that is connected with luminescence unit comes off, occuring the harm of electric shock.In addition, the present invention can provide the user can in the situation that not powered-down directly change so that in the process of luminescence unit is installed, do not have outside the Accidental occurrence of electric shock, also can carry out easily the replacing of luminescence unit.
Description of drawings
Fig. 1 is the alternating current-direct current block schematic diagram of formula illumination driving circuit altogether of first embodiment of the invention;
Fig. 2 is the schematic illustration in this operation element cycle among explanation the 1st figure;
Fig. 3 a-3c is the alternating current-direct current detailed circuit diagram of formula illumination driving circuit altogether of second embodiment of the invention; And
Fig. 4 a-4c is the alternating current-direct current detailed circuit diagram of formula illumination driving circuit altogether of third embodiment of the invention.
Description of reference numerals: 2,2 ', 2 " alternating current-direct current is the formula illumination driving circuit altogether; The 4-luminescence unit; The 6-input unit; The 8-converting unit; 82-the first commutation circuit; 84-the second commutation circuit; The 10-control unit; The 102-control end; The 104-detecting is feedback and is held; The 12-output unit; The 14-filter unit; The PW-power supply; P1, P2-current path; CS, CS1, CS2-control signal; The FBS-feedback signal; The CPW-conversion electric power; τ-pulse duration; The T-square-wave cycle; The HV-high potential; The LV-electronegative potential; L, L2-inductance; C1-electric capacity; The D1-D5-diode.
Embodiment
For fully understanding purpose of the present invention, feature and effect, hereby by following specific embodiment, and cooperate appended graphicly, the present invention is described in detail, illustrate as after:
With reference to figure 1, it is the altogether block schematic diagram of formula illumination driving circuit of alternating current-direct current of the present invention.In Fig. 1, this alternating current-direct current altogether formula illumination driving circuit 2 is used for driving luminescence unit 4.Wherein, this luminescence unit 4 can be the lamp source group that is comprised of single or multiple optical diode serial or parallel connection.Moreover this alternating current-direct current altogether formula illumination driving circuit 2 comprises input unit 6, converting unit 8, control unit 10 and output unit 12.
This input unit 2 is used for receiving an outside power supply PW, and for example this power supply PW can be alternating current.This converting unit 8 is connected with this input unit 2, is used for this power supply of conversion PW to form a conversion electric power CPW.Moreover this converting unit 8 more comprises the first commutation circuit 82 and the second commutation circuit 84.Wherein, this first commutation circuit 82 and this second commutation circuit 84 can be at least its one of buck-converter (buck converter) or step-down/up type transducer (buck-boost converter).In other words, this converting unit 8 can be carried out to this power supply PW the conversion of rectification and step-down.
It is the schematic illustration of the control signal of this controlled work period in Fig. 2, wherein the control signal of this controlled work period is a series of pulse square wave signal, and the work period of the control signal of this controlled work period (or claiming duty ratio) is defined as the ratio of pulse duration τ and square-wave cycle T, and wherein transverse axis is that time shaft and the longitudinal axis are the current potential axle.For example, when this pulse square wave signal is positioned at high potential HV, then can provide the electronic switch conducting; Otherwise, when this pulse square wave signal is positioned at electronegative potential LV, then can provide electronic switch to close.
In addition, this electronic switch conducting and the time of closing, be subject to the impact of pulse duration τ in the control signal of this controlled work period.In one embodiment, this control unit 10 can be pulse wave width modulation (pulse width modulation) circuit, and this pulse width modulation circuit produces the control signal of this controlled work period.In other words, the control signal of this controlled work period can should pulse duration τ and the ratio of square-wave cycle T by this pulse width modulation the regulation of electrical circuit.
This output unit 12 connects this converting unit 8 and this control unit 10, delivers to this detecting back coupling end 104 of this control unit 10 for generation of this feedback signal FBS, and this output unit 12 also and receives this conversion electric power CPW to drive this luminescence unit 4.
In addition, this alternating current-direct current altogether formula illumination driving circuit 2 can more comprise filter unit 14 and is arranged between this input unit 2 and this converting unit 8, is used for for example noise pulse of surging and so on of filtering.
Please in the lump with reference to figure 1 and Fig. 3 a-3c, the alternating current-direct current of this Fig. 3 a-3c first embodiment of the invention detailed circuit diagram of formula illumination driving circuit altogether wherein.In Fig. 3 a, this alternating current-direct current is formula illumination driving circuit 2 ' be connected with this luminescence unit 4 altogether.Wherein, this first commutation circuit 82 of this converting unit 8 is the step-down/up type transducer with this second commutation circuit 84, and this first commutation circuit 82 and this second commutation circuit, 84 common inductance that use, the voltage transitions that it carries out step-down to the positive-negative half-cycle voltage of this power supply PW respectively.At this, this converting unit 8 take electronic switch MOS1, the MOS2 of two metal-oxide semiconductor (MOS)s (metal-oxide-semiconductor field-effect transistor) as the example explanation.In another embodiment, this electronic switch can effect electric crystal (field-effect transistor), two-carrier junction electric crystal (Bipolar Junction transistor) or its combination replace.
This alternating current-direct current is formula illumination driving circuit 2 ' comprise input unit 6, converting unit 8, control unit 10, output unit 12 and filter unit 14 altogether.Wherein, this converting unit 8 is by diode D1-D5, and electronic switch MOS1, MOS2 and inductance L form, and this control unit 10 is the pulse width modulation circuit.
With reference to figure 3b, this power supply PW is input as example with positive half cycle voltage and describes, this power supply PW of positive half cycle produces this control signal CS1 and CS2 according to this control unit 10, in order to this electronic switch of side by side conducting MOS1, MOS2, so that this power supply PW forms the first current path P1 in this input unit 6 and this converting unit 8, this moment with storage power in inductance L.Then, this control unit 10 produces this control signal CS1 and CS2 side by side closes this electronic switch MOS1, MOS2, is released into this luminescence unit 4 so that be stored in the energy of this inductance L by this output unit 12 formed the second current path P2.
With reference to figure 3c, when this power supply PW entered negative half period, it was P3 that control unit 10 generation this control signal CS1 and CS2 form a current path for this electronic switch of side by side conducting MOS1, MOS2, makes this power supply PW to this inductance L storage power.Then, when this control unit 10 produces this control signal CS1 and CS2 side by side closes this electronic switch MOS1, MOS2, be released into this luminescence unit 4 so that be stored in the energy of this inductance L by this output unit 12 formed the second current path P2.
In addition, this output unit 12 comprises a capacitor C1 in order to as filtering usefulness, and 12 of this output unit more comprises the detecting resistance R, and this detecting resistance R becomes a voltage signal that this feedback signal FBS is provided the current conversion of this luminescence unit 4.Wherein, this detecting resistance R and this luminescence unit 4 are connected in series, and the other end of this detecting resistance R is connected to ground connection (ground), and this capacitor C1 connects this luminescence unit 4 and this detecting resistance R in parallel.
Please in the lump with reference to figure 1 and Fig. 4 a-4c, the alternating current-direct current of this Fig. 4 a-4c second embodiment of the invention detailed circuit diagram of formula illumination driving circuit altogether wherein.
This alternating current-direct current is formula illumination driving circuit 2 altogether " comprises input unit 6, converting unit 8, control unit 10, output unit 12 and filter unit 14.Wherein, this converting unit 8 is comprised of diode D1-D2, D4-D5, electronic switch MOS1, MOS2 and inductance L 2, this first commutation circuit 82 of this converting unit 8 is a buck-converter, and this second commutation circuit 84 is a step-down/up type transducer and the first commutation circuit 82 and these second commutation circuit, 84 shared same inductance, and this control unit 10 is the pulse width modulation circuit.
With reference to figure 4b, this power supply PW is input as example with positive half cycle voltage and describes.When this power supply during at positive half cycle, these the first commutation circuit 82 actions of this converting unit 8 are as a step-down controller, and the control signal CS2 that this power supply PW of positive half cycle produces according to this control unit 10 is in order to continue to close this electronic switch MOS2, and this control signal CS1 is in order to this electronic switch of conducting MOS1, so that this power supply PW forms the first current path P1 in this input unit 6 and this converting unit 8, in order to this inductance L 2 is carried out energy storage and is driven this luminescence unit 4, moreover the control signal CS1 that produces when this control unit 10 is in order to close this electronic switch MOS1.At this moment, the energy that is stored in this inductance L 2 drives this luminescence unit 4 constantly with current path P2.
Then, with reference to figure 4c, when this power supply PW entered negative half period, these the second commutation circuit 84 actions of this converting unit 8 were as a step-down/up type transducer.Control unit 10 produces control signal CS1 in order to close constantly this electronic switch MOS1, and this control signal CS2 is in order to this electronic switch of conducting MOS2, so that this power supply PW forms a current path P3 in order to this inductance L 2 is carried out energy storage in this input unit 6 and this converting unit 8; And, when control unit 10 generation control signal CS2 close this electronic switch MOS2, be released into this luminescence unit 4 so that be stored in the energy of this inductance L 2 by this output unit 12 formed the second current path P2.
In addition, this output unit 12 comprises a capacitor C1 in order to as filtering usefulness, and 12 of this output unit more comprises the detecting resistance R, and this detecting resistance R becomes a voltage signal that this feedback signal FBS is provided the current conversion of this luminescence unit 4.Wherein, this detecting resistance R and this luminescence unit 4 are connected in series, and the other end of this detecting resistance R is connected to the earth (ground), and this Parallel-connected Capacitor is connected to this luminescence unit 4 and this detecting resistance R series circuit.
Compare with prior art, alternating current-direct current of the present invention altogether the formula illumination driving circuit owing to having an alterating and direct current feature altogether, so that from the alternating current of civil power and the conversion electric power of changing through converting unit, in the situation that have the same reference current potential, can be used for avoiding when the power circuit that is connected with luminescence unit comes off, occuring the harm of electric shock.In addition, the present invention can provide the user can in the situation that not powered-down directly change this luminescence unit, it also can change luminescence unit easily except the Accidental occurrence that does not have electric shock.
The present invention discloses with preferred embodiment hereinbefore, so has the knack of the technology person and it should be understood that this embodiment only is used for describing the present invention, does not limit the scope of the invention and should not be read as.It should be noted, such as with variation and the displacement of this embodiment equivalence, all should be made as and be covered by in the category of the present invention.Therefore, protection scope of the present invention when with hereinafter claim the person of being defined be as the criterion.
Claims (7)
1. alternating current-direct current formula illumination driving circuit altogether is used for driving at least one luminescence unit, it is characterized in that, comprises:
One input unit is used for receiving an outside power supply;
One converting unit is connected with this input unit, is used for this power supply of conversion to form a conversion electric power;
One control unit has a control end and a detecting back coupling end, and this control end is used for having the control signal that can control the work period according to the feedback signal generation that this detecting back coupling termination is received, and wherein this control signal is controlled this converting unit; And
One output unit connects this converting unit and this control unit, is used for this feedback signal of output to this detecting back coupling end and transmits this conversion electric power to drive this luminescence unit.
2. such as claim 1 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, more comprise: a filter unit is arranged between described input unit and the described converting unit.
3. such as claim 1 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, described converting unit has a plurality of commutation circuits, and these a plurality of commutation circuits be buck change-over circuit or step-down/up type change-over circuit one of them, these a plurality of commutation circuits are jointly used an inductance again.
4. such as claim 1 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, described control unit is pulse width modulation circuit, and this can control this control signal of work period for generation of control.
5. such as claim 1 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, described output unit more comprises a capacitor and a detecting resistance, this capacitor for this conversion electric power filtering and should detecting resistance for producing this feedback signal.
6. such as claim 5 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, described converting unit is connected to an end of this luminescence unit, one end of described detecting resistance is connected in series to the other end of described luminescence unit, and the other end of described detecting resistance is connected with the earth.
7. such as claim 6 described alternating current-direct current formula illumination driving circuit altogether, it is characterized in that, described Parallel-connected Capacitor ground connects described luminescence unit and described detecting resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101786450A CN102858047A (en) | 2011-06-29 | 2011-06-29 | AC/DC (alternating current/direct current) common-ground illumination drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101786450A CN102858047A (en) | 2011-06-29 | 2011-06-29 | AC/DC (alternating current/direct current) common-ground illumination drive circuit |
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| CN102858047A true CN102858047A (en) | 2013-01-02 |
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| CN2011101786450A Pending CN102858047A (en) | 2011-06-29 | 2011-06-29 | AC/DC (alternating current/direct current) common-ground illumination drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326599A (en) * | 2013-06-19 | 2013-09-25 | 华南理工大学 | BUCK-BUCK-BOOST bridgeless converter |
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| TW200539478A (en) * | 2004-05-27 | 2005-12-01 | Richtek Techohnology Corp | Method to adjust brightness of light-emitting device and its driving apparatus |
| TW200838358A (en) * | 2006-11-21 | 2008-09-16 | Exclara Inc | Time division modulation with average current regulation for independent control of arrays of light emitting diodes |
| WO2009039112A1 (en) * | 2007-09-21 | 2009-03-26 | Exclara, Inc. | Digital driver apparatus, method and system for solid state lighting |
| CN102098833A (en) * | 2009-12-09 | 2011-06-15 | 立锜科技股份有限公司 | Light emitting device driver circuit and method for driving light emitting device |
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2011
- 2011-06-29 CN CN2011101786450A patent/CN102858047A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200539478A (en) * | 2004-05-27 | 2005-12-01 | Richtek Techohnology Corp | Method to adjust brightness of light-emitting device and its driving apparatus |
| TW200838358A (en) * | 2006-11-21 | 2008-09-16 | Exclara Inc | Time division modulation with average current regulation for independent control of arrays of light emitting diodes |
| WO2009039112A1 (en) * | 2007-09-21 | 2009-03-26 | Exclara, Inc. | Digital driver apparatus, method and system for solid state lighting |
| CN102098833A (en) * | 2009-12-09 | 2011-06-15 | 立锜科技股份有限公司 | Light emitting device driver circuit and method for driving light emitting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103326599A (en) * | 2013-06-19 | 2013-09-25 | 华南理工大学 | BUCK-BUCK-BOOST bridgeless converter |
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Application publication date: 20130102 |