CN102209414A - LED lighting device and LED illuminator - Google Patents
LED lighting device and LED illuminator Download PDFInfo
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- CN102209414A CN102209414A CN2011100649403A CN201110064940A CN102209414A CN 102209414 A CN102209414 A CN 102209414A CN 2011100649403 A CN2011100649403 A CN 2011100649403A CN 201110064940 A CN201110064940 A CN 201110064940A CN 102209414 A CN102209414 A CN 102209414A
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Abstract
The invention relates to an LED lighting device and an LED illuminator. The LED lighting device (1) comprises a DC power supply circuit (2) formed to output constant voltage to the two ends of a capacitor (C3) for smooth use; a light emitting diode (3) connected on the two ends of the capacitor (C3) for smooth use; a current detecting circuit (4) for detecting the current flowing through the light emitting diode (3); and a bypass circuit (5) comprising a second resistor (R2) connected on the two ends of the capacitor (C3) for smooth use and a series circuit of a switching element (Trl) and used for controlling the switching element (Trl) to be turned on when the current is detected by the current detecting circuit (4) to be more than a prescribed value.
Description
Technical field
The present invention relates to a kind of LED ignition device that light-emitting diode (diode) is lit a lamp and the LED ligthing paraphernalia that possesses this LED ignition device.
Background technology
(Light Emitting Diode LED) is used for the common ligthing paraphernalia of using as light source to light-emitting diode.This ligthing paraphernalia is equipped with a plurality of light-emitting diodes to obtain the illumination (brightness) of regulation.And, be high output as far as possible in order to make from the output of the light of each light-emitting diode, have to make near the flow through situation of light-emitting diode of the constant current of maximum permissible current.In case supply voltage generation drastic change has little time to carry out constant current control sometimes, thereby cause the overcurrent light-emitting diode of flowing through herein.And, pull down light-emitting diode at ignition device from energized, when perhaps light-emitting diode being connected in ignition device again, also have the overcurrent light-emitting diode of flowing through sometimes.
And, propose to have a kind of flow through LED drive unit (with reference to patent documentation 1) of LED unit of overcurrent that when connecting LED unit (unit) again, prevents.The LED drive unit of this background technology possesses the bindiny mechanism that releasably connects the LED unit and differentiates the LED unit that to be connected in bindiny mechanism still be the non-loaded mechanism for identifying that the LED unit has been pulled down from bindiny mechanism, and the series circuit of resistor and switch (switching) the element mechanism of promptly discharging is connected in parallel in the smoothing capacitor (condenser) of DC-to-DC switching mechanism.And, conducting disconnects (ON/OFF) switching mechanism when being connected in bindiny mechanism by non-loaded mechanism for identifying differentiation for the LED unit, switch element is made as off-state, and differentiate by non-loaded mechanism for identifying be the LED unit when bindiny mechanism pulls down, switch element is switched to conducting state from off-state.
[prior art document]
[patent documentation]
[patent documentation 1] Japan Patent spy opens 2010-55824 communique (7-8 page or leaf, the 1st figure)
When the LED drive unit of patent documentation 1 is not connected in bindiny mechanism in the LED unit, the mechanism of will discharging is connected in parallel in smoothing capacitor, make that voltage reduces between the two ends of smoothing capacitor, thereby prevent the overcurrent LED unit of flowing through when being connected in bindiny mechanism in the LED unit.The caused overcurrent such as drastic change of the supply voltage in the time of therefore, can't preventing that the LED unit the is connected in bindiny mechanism LED unit of flowing through.
And the LED drive unit is provided with non-loaded mechanism for identifying or conducting and disconnects switching mechanism, and therefore the conducting off-state with the switch element of switch discharges mechanism has circuit structure to become complicated, thus the shortcoming of the high price that becomes.
This shows that above-mentioned existing LED ignition device and LED ligthing paraphernalia obviously still have inconvenience and defective, and demand urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of LED ignition device and LED ligthing paraphernalia of new structure, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, overcome the defective that existing LED ignition device and LED ligthing paraphernalia exist, and the LED ligthing paraphernalia that a kind of LED ignition device of new structure is provided and possesses this LED ignition device, technical problem to be solved can form it at an easy rate and can suppress the overcurrent light-emitting diode of flowing through, and is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.Comprise according to technical scheme 1 described LED ignition device of the present invention: DC power supply circuit, have smoothing capacitor, form in the mode of output constant voltage between the two ends of this smoothing capacitor; Light-emitting diode is connected between the two ends of described smoothing capacitor; Current detection circuit detects the electric current of this light-emitting diode of flowing through; And bypass (bypass) circuit, have the resistance between the two ends that are connected in described smoothing capacitor and the series circuit of switch element, when current detection circuit detects the electric current of flowing through more than the setting, control described switch element and become conducting.
In the present invention and following each invention, as long as do not mention especially, then each structure is as follows.
The two ends of smoothing capacitor are meant the output of DC power supply circuit.
DC power supply circuit so long as between the two ends of smoothing capacitor output constant voltage direct voltage get final product, battery (battery) for example, alternating voltage is carried out rectification or the level and smooth device of rectification, and the device etc. that on described battery or device, is connected with boost chopper (chopper) circuit, buck chopper circuit or buck chopper device circuit.
Light-emitting diode also can be one or more, if be a plurality of, then be connected in series or connect side by side any all can.
The resistance value of resistance is configured to bring into play function as discharge resistance.
" electric current that setting is above " is meant the overcurrent of the light-emitting diode of flowing through.And setting for example can be made as the maximum permissible current of the light-emitting diode of can flowing through.
According to the present invention, when the electric current more than overcurrent is setting is flowed through current detection circuit, under the state of light-emitting diode lighting, the conducting during this is whole of the switch element of bypass circuit, thus resistance is connected between the two ends of smoothing capacitor.Voltage comes the overvoltage that surpasses this constant voltage is discharged by resistance between the two ends of smoothing capacitor, thereby becomes constant voltage.Thus, suppress the overcurrent light-emitting diode of flowing through.
The invention of technical scheme 2 described LED ignition devices is the inventions according to technical scheme 1 described LED ignition device, it comprises: the current blocking circuit, have the switching device that is connected with light-emitting diode series connection than the more close light-emitting diode side of described current detection circuit, it is corresponding to the conducting disconnection of the switch element of described bypass circuit and be controlled that the conducting of this switching device disconnects.
Light-emitting diode is connected between the two ends of smoothing capacitor and lights a lamp when the switching device conducting, and when switching device disconnects, and is not attached between the two ends of smoothing capacitor and turns off the light.
And, conducting when switching device disconnects at the switch element of bypass circuit, and when the switch element conducting, disconnect.
According to the present invention, when the electric current more than overcurrent is setting is flowed through current detection circuit, the switch element conducting of bypass circuit, and switching device disconnects.Light-emitting diode is not attached between the two ends of smoothing capacitor, does not flow through thereby there is overcurrent.And, the electric current current detection circuit of no longer flowing through, the switch element of bypass circuit disconnects, and the switching device conducting.
The switch element conducting till disconnecting during, the resistance of bypass circuit is connected between the two ends of smoothing capacitor.Voltage comes the overvoltage that surpasses this constant voltage is discharged by resistance between the two ends of smoothing capacitor, thereby becomes constant voltage.Thus, light-emitting diode is applied constant voltage and the constant current of flowing through, flow through to suppress overcurrent.
The object of the invention to solve the technical problems also realizes by the following technical solutions.Comprise according to technical solution of the present invention 3 described LED ligthing paraphernalias: according to technical scheme 1 or 2 described LED ignition devices; And apparatus body, setting this LED ignition device.
According to the present invention, owing to possess technical scheme 1 or 2 described LED ignition devices, therefore can provide a kind of overcurrent that can suppress to flow through as the LED ligthing paraphernalia of the light-emitting diode of light source.
The present invention compared with prior art has tangible advantage and beneficial effect by technique scheme, and LED ignition device of the present invention and LED ligthing paraphernalia have following advantage and beneficial effect at least:
Invention according to technical scheme 1, during overcurrent is flowed through current detection circuit whole, the resistance of bypass circuit is connected between the two ends of smoothing capacitor, come the overvoltage between the two ends of smoothing capacitor is discharged by resistance, therefore under the state of light-emitting diode lighting, the overcurrent light-emitting diode of flowing through can be suppressed, thereby the destruction of the light-emitting diode that causes because of overcurrent or short life etc. can be prevented.
Invention according to technical scheme 2, when overcurrent is flowed through current detection circuit resistance, the conducting of the switch element by bypass circuit, the disconnection of the switching device of current blocking circuit, light-emitting diode no longer is connected between the two ends of smoothing capacitor, thereby no longer include the overcurrent light-emitting diode of flowing through, and when the switch element conducting of bypass circuit, resistance is connected between the two ends of smoothing capacitor, come the overvoltage of voltage between the two ends of smoothing capacitor is discharged by resistance, therefore the overcurrent light-emitting diode of flowing through can be suppressed, thereby the destruction of the light-emitting diode that causes because of overcurrent or short life etc. can be prevented.
According to the invention of technical scheme 3, suppress overcurrent and flow through owing to possess as the LED ignition device of the light-emitting diode of light source, therefore the LED ligthing paraphernalia of a kind of destruction that prevents the light-emitting diode that causes because of overcurrent or short life etc. can be provided.
In sum, the invention relates to a kind of LED ignition device and LED ligthing paraphernalia.This LED ignition device comprises: DC power supply circuit forms in the mode of output constant voltage between the two ends of smoothing capacitor; Light-emitting diode is connected between the two ends of smoothing capacitor; Current detection circuit detects the electric current of the light-emitting diode of flowing through; And bypass circuit, have the 2nd resistance between the two ends that are connected in smoothing capacitor and the series circuit of switch element, when the electric current more than current detection circuit detects setting flows, control this switch element and become conducting.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the schematic circuit diagram of the LED ignition device of expression example 1 of the present invention.
Fig. 2 is the variation diagram of electric current of the light-emitting diode of flowing through of expression example 1 of the present invention.
Fig. 3 is the schematic circuit diagram of the LED ignition device of expression example 2 of the present invention.
Fig. 4 is the approximate three-dimensional map of the LED ligthing paraphernalia of expression example 3 of the present invention.
1, the 15:LED ignition device 2: DC power supply circuit/current detection circuit
3: light-emitting diode/current detection circuit 4: current detection circuit
5: bypass circuit 6a, 6b: input terminal
7a, 7b, 7a1,7a2,7b1,7b2: lead-out terminal 8: connector
9:AC-DC change-over circuit 10: buck chopper device circuit
11: full-wave rectifying circuit 12: noise filter circuit
13: control circuit 14:LED circuit
16: current blocking circuit 17:LED ligthing paraphernalia
18: apparatus body 19: light source cell
20: luminous element 21: cell body
21a: opening 22: lid
23: light-passing board 24: screw
A1: mid point C1, C2, C4: capacitor
C3: smoothing capacitor D1: diode
E: ground wire L1: inductor
Q1: field-effect transistor R1: the 1st resistance
R2: as the 2nd resistance R 3 of resistance: resistance
T1: transformer Tr1: as the N type bipolar transistor of switch element
Tr2: as the N type bipolar transistor Vs of switching device: commercial ac power source
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to LED ignition device and its embodiment of LED ligthing paraphernalia, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to obtain one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Among the present invention, between the two ends of the smoothing capacitor of DC power supply circuit, be connected with the series circuit of resistance and switch element.And during overcurrent was flowed through current detection circuit whole, switch element was switched on, and comes the overvoltage between the two ends of smoothing capacitor is discharged by resistance.Thus, suppress the overcurrent light-emitting diode of flowing through.
[example 1]
Fig. 1 and Fig. 2 represent example 1 of the present invention, and Fig. 1 is the schematic circuit diagram of LED ignition device, and Fig. 2 is the variation diagram of electric current of light-emitting diode of flowing through.
In Fig. 1, LED ignition device 1 has DC power supply circuit 2, light-emitting diode 3, current detection circuit 4 and bypass circuit 5 and constitutes.And input terminal 6a, 6b are connected in commercial ac power source Vs, and lead-out terminal 7a, 7b are located in the connector (connector) 8.
DC power supply circuit is that (Alternating Current-Direct Current, AC-DC) change-over circuit 9 and buck chopper device circuit 10 constitute by AC-DC.AC-DC change-over circuit 9 be have full-wave rectifying circuit 11, (transformer) T1 that possesses transformer and noise filter (noise filter) circuit 12 that forms and form with the capacitor C1 that plays a role as noise filter.And the input terminal of full-wave rectifying circuit 11 is connected in input terminal 6a, 6b via noise filter circuit 12.Between the lead-out terminal of full-wave rectifying circuit 11, connecting capacitor C1.The low potential side of capacitor C1 is connected in ground wire (earth) E via capacitor C2.The alternating voltage of 9 couples of commercial ac power source Vs of AC-DC change-over circuit for example AC100V carries out full-wave rectification, and full-wave rectified voltage is exported between the two ends of capacitor C1.
Buck chopper device circuit 10 is formed with well-known structure, and is connected between the output of AC-DC change-over circuit 9.That is, described buck chopper device circuit 10 has: be connected in parallel in field-effect transistor (transistor) Q1 of capacitor C1 of AC-DC change-over circuit 9 and the series circuit of diode D1; And be connected in parallel in inductor (inductor) L1 of diode D1 and the series circuit of smoothing capacitor C3.Be between the output of buck chopper device circuit 10 and between the two ends of smoothing capacitor C3, and be connected in lead-out terminal 7a, 7b between the output of DC power supply circuit 2.On this lead-out terminal 7a, 7b, connecting light-emitting diode 3.
And, be connected in control circuit 13 between the grid of field-effect transistor Q1 (gate), source electrode (source).Control circuit 13 for example the control signal (driving voltage) of DC3V～4V is applied between the grid (gate), source electrode of field-effect transistor Q1 so that field-effect transistor Q1 conducting, and the mode of itself light-emitting diode 3 so that constant current is flowed through is exported control signal and made field-effect transistor Q1 carry out conducting to disconnect action.Thus, the direct voltage of exporting from AC-DC change-over circuit 9 is subjected to copped wave (chopping), thereby produces constant voltage between the two ends of smoothing capacitor C3.
So, DC power supply circuit 2 has smoothing capacitor C3, and forms the mode of light-emitting diode 3 so that constant current is flowed through and between the two ends of smoothing capacitor C3 output dc voltage.
Light-emitting diode 3 forms a plurality of led circuits 14 that are connected in series and form.Light-emitting diode 3 is made of same kind, and form, when between the two ends that between the two ends of led circuit 14, apply smoothing capacitor C3 during voltage (constant voltage), there is constant current to flow through and light a lamp, and radiates visible light (for example white light) as illumination light.
The flow through electric current of light-emitting diode 3 of 4 pairs of current detection circuits detects, and utilizes the 1st resistance R 1 to detect this electric current.The 1st resistance R 1 is inserted between the negative side and light-emitting diode 3 of smoothing capacitor C3.The electric current of light-emitting diode 3 of flowing through is converted into voltage between the two ends of the 1st resistance R 1, and is input to control circuit 13.
Bypass circuit 5 is by being formed as the 2nd resistance R 2 of resistance and as the series circuit of N type bipolar transistor (bipolar transistor) Tr1 of switch element and the capacitor C4 that is connected in parallel in bipolar transistor Tr1, and this series circuit is connected between the two ends of smoothing capacitor C3.And, be connected between the base stage of transistor Tr 1 (base), emitter (emitter) between the two ends of the 1st resistance R 1 of current detection circuit 4.
Bypass circuit 5 is connected between the two ends of the 2nd resistance R 2 between the two ends of smoothing capacitor C3 when transistor Tr 1 conducting.Thus, voltage discharges by the power consumption of the 2nd resistance R 2 between the two ends of smoothing capacitor C3.And, not conducting when transistor Tr 1 is flowed through the 1st resistance R 1 at constant current.But the electric current more than the setting that transistor Tr 1 is set surpassing constant current is that overcurrent is when flowing through the 1st resistance R 1, because of voltage increase conducting between the two ends of the 1st resistance R 1.Transistor Tr 1 is made as conducting during the electric current more than the setting is flowed through the 1st resistance R 1 whole.
In addition, constant current for example can be set at the electric current of the maximum permissible current that is lower than light-emitting diode 3 slightly, and setting can be set at the electric current that surpasses maximum permissible current slightly.
Secondly, the effect of example 1 of the present invention is narrated.
The electric current of light-emitting diode 3 of flowing through is that the 1st resistance R 1 by current detection circuit 4 detects, and is input to the control circuit 13 of DC power supply circuit 2.Control circuit 13 disconnects action with the constant current conducting that the mode of light-emitting diode 3 controls the field-effect transistor Q1 of buck chopper device circuit 10 of flowing through, so that direct voltage exports between the two ends of smoothing capacitor C3.Thus, the constant current light-emitting diode 3 of flowing through, light-emitting diode 3 is stably lit a lamp.
And during the loose contact of the connector 8 that causes when the rapid variation in voltage that commercial ac power source Vs takes place or because of vibration etc. etc., voltage rises sometimes between the two ends of smoothing capacitor C3.Rise at this voltage,, have little time to carry out constant current control sometimes, thereby as shown in Figure 2, the above electric current of the setting light-emitting diode 3 of flowing through is arranged though control circuit 13 carries out constant current control.
When the electric current more than the setting is an overcurrent when flowing through light-emitting diode 3,, thereby make transistor Tr 1 conducting of bypass circuit 5 because of voltage between the two ends of the 1st resistance R 1 of current detection circuit 4 rises.Transistor Tr 1 is conducting during the 1st resistance R 1 detects overcurrent whole.
During transistor Tr 1 conducting, the 2nd resistance R 2 of bypass circuit 5 is connected between the two ends of smoothing capacitor C3, and voltage is discharged by the 2nd resistance R 2 between the two ends of smoothing capacitor C3.Thus, when voltage descended gradually between the two ends of smoothing capacitor C3, the overcurrent of the light-emitting diode 3 of flowing through reduced gradually, and voltage descends gradually between the two ends of the 1st resistance R 1 of current detection circuit 4
And when the electric current of the 1st resistance R 1 of flowing through was lower than setting, the voltage that produces between the two ends of the 1st resistance R 1 can't make transistor Tr 1 conducting of bypass circuit 5, thereby transistor Tr 1 disconnects.Thus, the 2nd resistance R 2 no longer is connected between the two ends of smoothing capacitor C3, thereby the discharge of voltage is stopped between the two ends of smoothing capacitor C3.Herein, light-emitting diode 3 is in transistor Tr 1 conducting and also light a lamp during voltage is discharged between the two ends of smoothing capacitor C3.
And, after transistor Tr 1 disconnects,, make the constant current light-emitting diode 3 of flowing through by the constant current control of control circuit 13.
As described above, during overcurrent is flowed through the 1st resistance R 1 whole of current detection circuit 2, the 2nd resistance R 2 of bypass circuit 5 is connected between the two ends of smoothing capacitor C3, overvoltage between the two ends of smoothing capacitor C3 is discharged by the 2nd resistance R 2, therefore under the state that light-emitting diode 3 is lit a lamp, the overcurrent light-emitting diode 3 of flowing through can be suppressed, thereby the destruction of the light-emitting diode 3 that causes because of overcurrent or short life etc. can be prevented.
And the easy structure of carrying out according to voltage between the two ends of the 1st resistance R 1 of current detection circuit 4 has been adopted in the conducting disconnection control of the transistor Tr 1 of bypass circuit 5, therefore can form LED ignition device 1 at an easy rate.
In addition, the transistor Tr 1 of bypass circuit 5 also can be controlled to by the control circuit 13 of DC power supply circuit 2, detects overcurrent conducting when flowing through at current detection circuit 4.
[example 2]
Fig. 3 is the schematic circuit diagram of the LED ignition device of expression example 2 of the present invention.In addition, for the part identical, mark identical symbol and omit explanation with Fig. 1.
LED ignition device 15 shown in Figure 3 is to be provided with current blocking circuit 16 in LED ignition device 1 shown in Figure 1.And, a plurality of lead-out terminal 7a1,7b1,7a2,7b2 are set, a plurality of led circuits 14 are connected.And,, be provided with current detection circuit 4 and current blocking circuit 16 at each led circuit 14.And, between current detection circuit 4 and current blocking circuit 16, inserting resistance R 3.
Current blocking circuit 16 is blocked the electric current of the light-emitting diode 3 of flowing through, and it is connected in series in light-emitting diode 3, and is connecting than current detection circuit 4 more close light-emitting diode 3 sides.Current blocking circuit 16 is by forming as the N type of switching device bipolar (bipolar) transistor Tr 2.Transistor Tr 2 is inserted between current detection circuit 4 and the light-emitting diode 3.And the base stage of transistor Tr 2 is connected in the 2nd resistance R 2 of bypass circuit 5 and the mid point A1 of transistor Tr 1.
When transistor Tr 2 disconnects in the transistor Tr 1 of bypass circuit 5, come the base stage supplying electric current and conducting via the 2nd resistance R 2 from smoothing capacitor C3.Thus, light-emitting diode 3 is connected between the two ends of smoothing capacitor C3 and lights a lamp.
And transistor Tr 2 makes base stage and emission intereelectrode short-circuit and disconnects via the 1st resistance R 1 of current detection circuit 4 when transistor Tr 1 conducting of bypass circuit 5.Thus, light-emitting diode 3 is blocked with smoothing capacitor C3, flows through thereby no longer include electric current.So, transistor Tr 2 is subjected to conducting disconnection control corresponding to the conducting disconnection of the transistor Tr 1 of bypass circuit 5.
Secondly, the effect of example 2 of the present invention is narrated.
When the electric current more than the setting is an overcurrent when flowing through the 1st resistance R 1 of current detection circuit 4, voltage increases between the two ends of the 1st resistance R 1, transistor Tr 1 conducting of bypass circuit 5.When transistor Tr 1 conducting, the transistor Tr 2 of current blocking circuit 16 disconnects.Thus, light-emitting diode 3 no longer is connected between the two ends of smoothing capacitor C3, flows through thereby no longer include electric current.And electric current is no longer flowed through and is no longer produced voltage between the two ends of the 1st resistance R 1, the 1 resistance R 1 of current detection circuit 4, and thus, the transistor Tr 1 of bypass circuit 5 disconnects.When transistor Tr 1 disconnects, transistor Tr 2 conductings of this current blocking circuit 16, light-emitting diode 3 is connected in smoothing capacitor C3.
And, transistor Tr 1 conducting of bypass circuit 5 till disconnecting during, the 2nd resistance R 2 of bypass circuit 5 is connected between the two ends of smoothing capacitor C3.Voltage discharges by the 2nd resistance R 2 between the two ends of smoothing capacitor C3.
And, flow through till the 1st resistance R 1 of current detection circuit 4 until no longer including electric current more than the setting, repeat said process, thus, voltage becomes constant voltage between the two ends of smoothing capacitor C3.
In addition, though turn off the light when light-emitting diode 3 can disconnect in the transistor Tr 2 of current blocking circuit 16, but because this light-off, the transistor Tr 1 of this bypass circuit 5 will disconnect and the transistor Tr 2 of this current blocking circuit 16 with conducting, therefore light-emitting diode 3 is lit a lamp immediately, flicker is arranged but still lighting a lamp though range estimation it will be appreciated that light-emitting diode 3.
As described above, when overcurrent is flowed through the 1st resistance R 1 of current detection circuit 3, the conducting of the transistor Tr 1 by bypass circuit 5, the disconnection of the transistor Tr 2 of this current blocking circuit 16, then light-emitting diode 3 no longer is connected between the two ends of smoothing capacitor C3 and no longer includes the overcurrent light-emitting diode 3 of flowing through, and when transistor Tr 1 conducting of bypass circuit 5, the 2nd resistance R 2 is connected between the two ends of smoothing capacitor C3, the overvoltage of voltage is discharged by the 2nd resistance R 2 between the two ends of smoothing capacitor C3, therefore the overcurrent light-emitting diode 3 of flowing through can be suppressed, thereby the destruction of the light-emitting diode 3 that causes because of overcurrent or short life etc. can be prevented.
[example 3]
Fig. 4 is the approximate three-dimensional map of the LED ligthing paraphernalia of expression example 3 of the present invention.In addition, for the part identical, mark identical symbol and omit explanation with Fig. 2.
And luminous element 20 is positioned at the mode of the opening 21a side of cell body 21 with light-emitting diode 3, installs by not shown screw etc.
And the inside of apparatus body 18 is setting not shown LED ignition device 15.Each lead-out terminal 7a1,7b1,7a2, the 7b2 of LED ignition device 15 are connected in luminous element 20 by connector 8,8 and not shown lead, and light-emitting diode 3 are connected.
When LED ignition device 15 was connected the alternating voltage of commercial ac power source Vs, light-emitting diode 3 was lit a lamp, and radiates for example white light of visible light from light-emitting diode 3.The light-passing board 23 that this radiating light sees through cell body 21 throws light on to the floor side of the lower side that is positioned at apparatus body 18.
[industry is utilized possibility]
The present invention can be used in LED lamp (lamp) or the LED ligthing paraphernalia of light-emitting diode as light source.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (3)
1. LED ignition device is characterized in that comprising:
DC power supply circuit has smoothing capacitor, forms in the mode of output constant voltage between the two ends of this smoothing capacitor;
Light-emitting diode is connected between the two ends of described smoothing capacitor;
Current detection circuit detects the electric current of this light-emitting diode of flowing through; And
Bypass circuit has the resistance between the two ends that are connected in described smoothing capacitor and the series circuit of switch element, when this current detection circuit detects the electric current of flowing through more than the setting, controls described switch element and becomes conducting.
2. LED ignition device according to claim 1 is characterized in that comprising:
The current blocking circuit, have the switching device that is connected with this light-emitting diode series connection than the more close light-emitting diode side of described current detection circuit, the conducting disconnection of this switching device is to be controlled by the voltage that produces between the conducting disconnection of this switch element of described bypass circuit and the two ends corresponding to the 2nd resistance.
3. LED ligthing paraphernalia is characterized in that comprising:
LED ignition device according to claim 1 and 2; And
Apparatus body is setting this LED ignition device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-083037 | 2010-03-31 | ||
| JP2010083037A JP5447969B2 (en) | 2010-03-31 | 2010-03-31 | LED lighting device and LED lighting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102209414A true CN102209414A (en) | 2011-10-05 |
| CN102209414B CN102209414B (en) | 2014-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110064940.3A Expired - Fee Related CN102209414B (en) | 2010-03-31 | 2011-03-14 | LED lighting device and LED illuminator |
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| Country | Link |
|---|---|
| JP (1) | JP5447969B2 (en) |
| CN (1) | CN102209414B (en) |
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| JP6273894B2 (en) * | 2014-02-24 | 2018-02-07 | 岩崎電気株式会社 | LED lighting device and LED lighting device |
| JP6350821B2 (en) * | 2014-10-20 | 2018-07-04 | 東芝ライテック株式会社 | Light emitting module and lighting device |
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| JP2010055824A (en) * | 2008-08-26 | 2010-03-11 | Panasonic Electric Works Co Ltd | Led driving device, lighting system, and luminaire |
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| CN103249217A (en) * | 2012-02-03 | 2013-08-14 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus |
| CN103249217B (en) * | 2012-02-03 | 2015-05-06 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus |
| CN104145531A (en) * | 2012-03-05 | 2014-11-12 | 松下电器产业株式会社 | Two-wire load control device |
| CN104754793A (en) * | 2013-12-25 | 2015-07-01 | 深圳市海洋王照明工程有限公司 | Voltage-reduction constant-current LED (Light Emitting Diode) driving circuit, driving device and lighting system |
| CN104754793B (en) * | 2013-12-25 | 2019-04-12 | 深圳市海洋王照明工程有限公司 | A kind of decompression constant current LED drive circuit, driving device and lighting system |
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
| WO2017080086A1 (en) * | 2015-11-13 | 2017-05-18 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102209414B (en) | 2014-02-05 |
| JP5447969B2 (en) | 2014-03-19 |
| JP2011216316A (en) | 2011-10-27 |
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