CN104754832A - Led drive circuit and led lamp - Google Patents
Led drive circuit and led lamp Download PDFInfo
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- CN104754832A CN104754832A CN201510143789.0A CN201510143789A CN104754832A CN 104754832 A CN104754832 A CN 104754832A CN 201510143789 A CN201510143789 A CN 201510143789A CN 104754832 A CN104754832 A CN 104754832A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 8
- 230000001629 suppression Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 230000001939 inductive effect Effects 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 9
- 239000010703 silicon Substances 0.000 description 9
- 238000010304 firing Methods 0.000 description 8
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention provides an LED drive circuit and an LED lamp. The LED drive circuit comprises a rectifying circuit and an energy conversion circuit, the rectifying circuit is used for rectifying input alternating current so as to output pulsating direct current to the energy conversion circuit, the energy conversion circuit performs energy conversion on the direct current inputted from the rectifying circuit so as to provide needed current and voltage to LED particles, and the LED drive circuit further comprises a leakage circuit formed by a resistor and a capacitor in serial connection so as to provide extra load current to a switch in serial connection with the LED lamp of the LED drive circuit, so that normal conduction of the switch is guaranteed, and the problem about compatibility when an acoustic electric induction switch and a touch delay switch are matched with the LED lamp during operation by the aid of the concise application circuit is solved.
Description
Technical field
The invention belongs to field of electronic illumination, particularly relate to a kind of LED drive circuit and LED lamp.
Background technology
At present, LED lamp, as a kind of conventional light fixture, has generally been applied in the middle of daily life.The such as various switches of acousto-optic control inductive switch, touching delay-action switch are also widely used in corridor, building corridor, and washing house, lavatory, the places such as factory building garden, they are energy-saving lighting switchs of the novelty in a kind of modern times.This switch of initial design coordinates incandescent lamp loads, and it can electrical energy saving, can also help the useful life extending incandescent lamp bulb.But along with the improvement in the technological progress and production technology of Material Field, LED light source is due to its high-luminous-efficiency, and long service live, color true to nature, the advantages such as environmental protection, substitute the traditional application of incandescent lamp in illumination gradually.
But due to what mainly design for incandescent lamp loads during the initial design such as acousto-optic control inductive switch and touching delay-action switch; when the work of connection LED; LED load usually can be caused to occur the problem of glimmering, thus make energy-efficient LED cannot be applied to above-mentioned power down switch.
Occur that flicker reason is: the switching device of the inside of acousto-optic control inductive switch and touching delay-action switch is all a unidirectional or bidirectional triode thyristor device usually, reverse-blocking tetrode thyristor its load current when controlled triggering and conducting needs to be greater than initial firing current, triggering and conducting back loading electric current needs to be greater than maintenance electric current, and such silicon-controlled device could normal work.And LED due to light efficiency high, when the bright output of same light stream, power is generally much little than original incandescent lamp, therefore the input current needed is general less, the input current of LED may be less than silicon controlled initial firing current, this can make silicon-controlled device cannot reliably conducting, thus causes the line voltage inputing to LED unstable, produces LED flicker.
Therefore need a kind of succinct application circuit solve acousto-optic control inductive switch and touching delay-action switch cooperated with LED lamp work time compatibility issue.
Summary of the invention
According to an aspect of the present invention, a kind of LED drive circuit is provided.Described LED drive circuit comprises rectification circuit and power conversion circuits, wherein, rectification circuit is used for carrying out rectification with to power conversion circuits output ripple direct current to input AC electricity, power conversion circuits is carried out power conversion to the direct current inputted from rectification circuit thus is provided electric current and the voltage of needs to LED particle, wherein, described LED drive circuit also comprises the leadage circuit that formed by resistance and capacitances in series to provide extra load current to the switch be connected in series with the LED lamp comprising described LED drive circuit, thus ensures the normally of this switch.
According to a further aspect in the invention, described leadage circuit can be connected to the alternating current input two ends of described LED drive circuit.
According to a further aspect in the invention, described leadage circuit can be connected to the direct current output two ends of described rectification circuit.
According to a further aspect in the invention, described LED drive circuit also comprises electromagnetic interference suppression circuit, and wherein, described rectification circuit carries out rectification to the input AC electricity carrying out electromagnetic interference suppression through electromagnetic interference suppression circuit.
According to a further aspect in the invention, described leadage circuit can be connected to the alternating current input two ends of the rectification circuit after described electromagnetic interference suppression circuit.
According to a further aspect in the invention, described LED drive circuit also can comprise electromagnetic interference suppression circuit, the direct current that described electromagnetic interference suppression circuit is used for rectification circuit exports carries out electromagnetic interference suppression, and the direct current suppressed through electromagnetic interference is inputted described power conversion circuits carries out power conversion.
According to a further aspect in the invention, described leadage circuit can be connected to the output of described electromagnetic interference suppression circuit.
According to a further aspect in the invention, a kind of LED lamp comprising LED drive circuit described above is provided.
According to illustrated embodiment, can allow urban electric power switch on various common wall, such as acousto-optic control inductive switch, touching delay-action switch etc., when the load of band LED lamp, LED lamp can not be caused to occur the phenomenon of the operation irregularities such as flicker, thus compatibility issue when solving urban electric power switch band LED load, and cost is very low.
Accompanying drawing explanation
Fig. 1 is the structural representation of LED lamp conventional in prior art.
Fig. 2 shows the schematic block diagram of LED drive circuit according to an exemplary embodiment of the present invention.
Fig. 3 shows the example that leadage circuit is according to an exemplary embodiment of the present invention connected with LED drive circuit of the prior art.
Embodiment
The characteristic sum exemplary embodiment of various aspects of the present invention will be described in detail below.Description below covers many details, to provide complete understanding of the present invention.But, it will be apparent to one skilled in the art that the present invention can implement when not needing some details in these details.Below the description of embodiment is only used to by illustrating example of the present invention to provide to the clearer understanding of the present invention.Any concrete configuration proposed below the invention is not restricted to, but cover any amendment of coherent element or parts, replacement and improvement under the premise of without departing from the spirit of the present invention.
Fig. 1 is the structural schematic block diagram of LED lamp conventional in prior art.As shown in Figure 1, described LED lamp comprises LED drive circuit and LED particle.Described LED lamp can be connected in series in power supply circuits with described acousto-optic control inductive switch or touching delay-action switch etc.LED drive circuit is used for providing required electric current and voltage for LED particle.
Fig. 2 shows the schematic block diagram of LED drive circuit according to an exemplary embodiment of the present invention.Generally, the LED drive circuit of prior art comprises electromagnetic interference (EMI) and suppresses circuit 210, rectification circuit 220 and power conversion circuits 230.Wherein, EMI suppresses circuit 210 to can be used for suppressing the electromagnetic interference in circuit.Rectification circuit 220 is for carrying out rectification with to power conversion circuits 230 output ripple direct current to the input AC electricity suppressing circuit 210 to input via EMI.Power conversion circuits 230 is for the electric current that provides to LED particle and voltage.
Switch (such as acousto-optic control inductive switch, touching delay-action switch is in circuit connected in series with LED lamp, not shown in the drawings) inner silicon-controlled device needs the load current being greater than initial firing current when triggering and conducting, and when conducting state, needs are greater than the load current maintaining electric current.If do not meet this two conditions, the silicon-controlled device in switch cannot maintain normal work.The scope of initial firing current and maintenance electric current is different with silicon controlled model, such as, for the bidirectional triode thyristor that urban electric power switch on the wall of lamp lighting is inner, generally its current effective value is at about 1A, the model Z00607 that such as STMicw Electronics produces, be the standard controllable silicon of a current effective value 0.8A, be widely used in the urban electric power switch of doing light fixture or small household appliances.Its maintenance electric current is usually at 5mA.Its initial firing current is usually at 20mA.Be the LED of 3W for a power output, under 220V civil power, the effective value of input current approximately only has about 20mA, if therefore as the load of urban electric power switch on such wall, very possible because load current is less than the initial firing current of inner bidirectional triode thyristor and causes the operation irregularity of whole system.
According to an exemplary embodiment of the present, provide a kind of a kind of scheme solving in prior art existing problem, exactly existing for the LED drive circuit of LED lamp in increase leadage circuit, this vent discharge routing resistance and capacitances in series composition.
This leadage circuit can be connected to the alternating current input of the LED drive circuit that LED lamp of the prior art comprises two ends (position 1 as Fig. 2), as described in LED drive circuit the EMI that comprises suppress alternating current input two ends (position 2 as Fig. 2) of the rectification circuit 220 after circuit 210 or as described in LED drive circuit rectification circuit 220 after direct current export two ends (position 3 as Fig. 2).
In addition, as another example, electromagnetic interference EMI shown in Fig. 2 suppresses after circuit can be positioned at rectification circuit, to carry out electromagnetic interference suppression with the direct current exported rectification circuit, and the direct current suppressed through electromagnetic interference is inputted described power conversion circuits carries out power conversion.In this case, described leadage circuit can be connected to the output of the electromagnetic interference suppression circuit before power conversion circuits.
Shown in Fig. 2 is exemplarily, and in the prior art, in order to save cost, some LED drive circuit does not comprise EMI and suppresses circuit.In this case, alternating current input two ends (also namely do not comprise EMI and suppress the two ends of the alternating current input of the LED drive circuit of circuit) or the direct current of rectification circuit that leadage circuit can be connected to rectification circuit export two ends.Exemplarily, the capacitance normally hundreds of nF of electric capacity, the switch (such as touching delay-action switch or acousto-optic control inductive switch) that electric capacity in this leadage circuit is used for being connected in series with LED lamp of the prior art provides extra load current, the total load current flowing through this switch is made to be greater than the silicon controlled initial firing current of this switch and to maintain electric current, thus ensure the normally of this switch, here, total load current equals the electric current of leadage circuit and the input current sum of former LED drive circuit (being also LED drive circuit of the prior art).The effect of the resistance of leadage circuit is the voltage and current spike caused for eliminating or suppress above-mentioned electric capacity.
Fig. 3 shows the example that leadage circuit is according to an exemplary embodiment of the present invention connected with a LED drive circuit of the prior art.Those skilled in the art should understand that, EMI described hereinafter suppresses circuit 310, the concrete structure of rectification circuit 320 and the power conversion circuits 330 just conveniently understanding of those skilled in the art and the schematic example that provides, it is not as limitation of the present invention, leadage circuit described in the present invention can suppress circuit 310 in conjunction with the EMI shown in Fig. 3, rectification circuit 320 and power conversion circuits 330 have the circuit structure of similar or identical function thus provide extra load current, to solve the problem that switch of the prior art and LED can not be compatible.
As shown in Figure 3, LED drive circuit comprises two power inputs (these two power inputs are connected with AC power AC) and two drive output (this drive output exports the constant current being supplied to LED particle) according to an exemplary embodiment of the present invention.Here, EMI suppresses the input of circuit 310 to be connected with the leadage circuit of resistance Rx1 and electric capacity Cx1 series connection formation.Exemplarily, EMI suppresses circuit 310 can be made up of inductance L 1-L2, resistance R1-R2 and electric capacity CX, rectification circuit 320 is made up of four diodes, and EMI suppresses the side of circuit 310 to be connected with AC power through leadage circuit, and opposite side is connected with the input of rectification circuit 320.The direct current of rectification circuit 320 inputs to power conversion circuits 330 and carries out power conversion to export electric current required for LED particle and voltage.Power conversion circuits 320 comprises the circuit that forms of the element such as some resistance, electric capacity, diode of LED driving governor, switch mosfet M1, transformer and periphery.Exemplarily, the OB3637 chip of Ang Bao company can be used as LED driving governor, this chip is the constant-current controller of the quasi-resonant mode of a band power factor emendation function.What shown here power conversion circuits 330 adopted is flyback framework, and main power conversion apparatus is made up of input capacitance Cin, switch M1, transformer T1, output rectifier diode D2, output capacitance Co etc.The Gate pin output of LED driving governor is pulse-width modulation (PWM) signal of certain frequency scope, adjustable pulse width relative to the output of its SW pin, and this signal is turned on and off by control switch M1 and realizes energy from the conversion being input to output.When M1 opens, input current flows through the winding Np of transformer T1 and switch M1 to ground, and the energy of input is stored in the magnetic core of T1; When input current reaches the set point of OB3637, switch M1 turns off, and now transformer T1 mono-aspect is powered the energy transferring be stored in before in magnetic core to electric capacity C2 through diode D1 by auxiliary winding Naux to OB3637; On the other hand by exporting winding Ns, through D2, export energy to electric capacity Co, thus lightening LED lamp.
Following table is the explanation of the pin of chip OB3637 used in this example.
Those skilled in the art should understand that, EMI shown in Fig. 3 suppresses the concrete structure of circuit 310, rectification circuit 320 and power conversion circuits 330 to be example, and the LED drive circuit mentioned in the present invention is not limited to the concrete structure that shown here EMI suppresses circuit 310, rectification circuit 320 and power conversion circuits 330.
According to an exemplary embodiment of the present, the leadage circuit formed by resistance and capacitances in series except the two ends (position 1 as Fig. 3) that can be connected to the alternating current input port of LED drive circuit, can also be connected to rectification circuit 320 alternating current input two ends (position 2 as Fig. 3) or rectification circuit 320 after direct current export two ends (position 3 as Fig. 3).
In addition, those skilled in the art should understand that, after electromagnetic interference EMI suppression circuit shown in Fig. 3 can be positioned at rectification circuit, carry out electromagnetic interference suppression with the direct current exported rectification circuit, and the direct current suppressed through electromagnetic interference is inputted described power conversion circuits carry out power conversion.In this case, described leadage circuit can be connected to the output of the electromagnetic interference suppression circuit before power conversion circuits.
Certainly, when in order to save cost and not LED drive circuit comprise EMI suppress circuit, leadage circuit can be connected to rectification circuit alternating current input two ends (namely do not comprise yet EMI suppress circuit LED drive circuit alternating current input two ends) or rectification circuit direct current export two ends.Leadage circuit is used for joining to LED strip the load current that the switch be connected in circuit provides extra, thus the total load current making to flow through switch (wherein, total load current equals the electric current of leadage circuit and the input current sum of LED drive circuit of the prior art) be greater than the silicon controlled initial firing current in switch and maintain electric current, thus ensure the normally of switch, thus solve compatibility issue when working with such as acousto-optic control inductive switch and touching delay-action switch cooperated with LED lamp.
Although described particular instance of the present invention, but it will be understood by those skilled in the art that other example existing and be equal to described example.Therefore, it will be understood by those skilled in the art that the present invention is not limited to shown particular instance, but only limited by the scope of claim.
Claims (8)
1. a LED drive circuit, comprise rectification circuit and power conversion circuits, wherein, rectification circuit is used for carrying out rectification with to power conversion circuits output ripple direct current to input AC electricity, power conversion circuits is carried out power conversion to the direct current inputted from rectification circuit thus is provided electric current and the voltage of needs to LED particle
Wherein, described LED drive circuit also comprises the leadage circuit that formed by resistance and capacitances in series to provide extra load current to the switch be connected in series with the LED lamp comprising described LED drive circuit, thus ensures the normally of this switch.
2. LED drive circuit as claimed in claim 1, wherein, described leadage circuit is connected to the alternating current input two ends of described LED drive circuit.
3. LED drive circuit as claimed in claim 1, wherein, the direct current that described leadage circuit is connected to described rectification circuit exports two ends.
4. LED drive circuit as claimed in claim 1, described LED drive circuit also comprises electromagnetic interference suppression circuit, and wherein, described rectification circuit carries out rectification to the input AC electricity carrying out electromagnetic interference suppression through electromagnetic interference suppression circuit.
5. LED drive circuit as claimed in claim 4, wherein, described leadage circuit is connected to the alternating current input two ends of the rectification circuit after described electromagnetic interference suppression circuit.
6. LED drive circuit as claimed in claim 1, described LED drive circuit also comprises electromagnetic interference suppression circuit, the direct current that described electromagnetic interference suppression circuit is used for rectification circuit exports carries out electromagnetic interference suppression, and the direct current suppressed through electromagnetic interference is inputted described power conversion circuits carries out power conversion.
7. LED drive circuit as claimed in claim 6, wherein, described leadage circuit is connected to the output of described electromagnetic interference suppression circuit.
8. one kind comprises the LED lamp of the LED drive circuit as described in any one in claim 1-7.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811183870.1A CN109496028A (en) | 2015-03-30 | 2015-03-30 | LED drive circuit and LED lamp |
| CN201510143789.0A CN104754832A (en) | 2015-03-30 | 2015-03-30 | Led drive circuit and led lamp |
| TW104115612A TWI555435B (en) | 2015-03-30 | 2015-05-15 | LED driver circuit and LED lighting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510143789.0A CN104754832A (en) | 2015-03-30 | 2015-03-30 | Led drive circuit and led lamp |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811183870.1A Division CN109496028A (en) | 2015-03-30 | 2015-03-30 | LED drive circuit and LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104754832A true CN104754832A (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811183870.1A Pending CN109496028A (en) | 2015-03-30 | 2015-03-30 | LED drive circuit and LED lamp |
| CN201510143789.0A Pending CN104754832A (en) | 2015-03-30 | 2015-03-30 | Led drive circuit and led lamp |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811183870.1A Pending CN109496028A (en) | 2015-03-30 | 2015-03-30 | LED drive circuit and LED lamp |
Country Status (2)
| Country | Link |
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| CN (2) | CN109496028A (en) |
| TW (1) | TWI555435B (en) |
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2015
- 2015-03-30 CN CN201811183870.1A patent/CN109496028A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109496028A (en) | 2019-03-19 |
| TW201635861A (en) | 2016-10-01 |
| TWI555435B (en) | 2016-10-21 |
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Application publication date: 20150701 |