CN103139982B - Alternating current direct-coupled type light-emitting diode lighting apparatus - Google Patents
Alternating current direct-coupled type light-emitting diode lighting apparatus Download PDFInfo
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- CN103139982B CN103139982B CN201210491934.0A CN201210491934A CN103139982B CN 103139982 B CN103139982 B CN 103139982B CN 201210491934 A CN201210491934 A CN 201210491934A CN 103139982 B CN103139982 B CN 103139982B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention relates to an alternating current direct-coupled type light-emitting diode lighting apparatus, and more particularly, to a light-emitting diode lighting apparatus which includes a rectifier diode for converting alternating current power into direct current power, a first light-emitting diode constituted by one or more light-emitting diodes, and a second light-emitting diode constituted by one or more light-emitting diodes, the lighting apparatus including: a first constant current circuit which allows constant current to flow to the first and second light-emitting diodes; a current sensing circuit which senses sensing current flowing to the second light-emitting diode through the first light-emitting diode; a second constant current circuit which supplies second constant current to the first light-emitting diode when the sensing current does not exist; and a third constant current circuit which supplies third constant current to the second light-emitting diode when the sensing current does not exist.
Description
Technical field
The present invention relates to a kind of light emitting diode illuminating apparatus, especially a kind ofly by half-wave or full-wave rectifying circuit, light-emitting diode be directly connected to AC power and improve luminous efficiency and alleviate the interchange direct coupled type light emitting diode illuminating apparatus of total harmonic distortion phenomenon.
Background technology
As the characteristic of diode, if the voltage being applied with more than forward threshold voltage when applying forward voltage to light-emitting diode will allow current flowing.Connected by the form that direct coupled type light-emitting diode is connected in series one or more light-emitting diode by full-wave rectification diode, connection in series-parallel connects of interchange Direct driver.When applying the power supply of full-wave rectification, under the voltage more than forward threshold voltage, light-emitting diode is connected (Turn-on) and electric current is flow through and starts ray.
Even if apply voltage below light-emitting diode turn-on voltage, light-emitting diode does not also have current flowing, and when taking single cycle as benchmark, the connection interval due to light-emitting diode is shorter and cause optical efficiency to decline and produce total harmonic distortion phenomenon.
When increasing the light-emitting diode quantity be connected in series, connect that required voltage can increase a lot and to connect interval shorter, thus foregoing problems is aggravated further, and can production cost be improved.
In contrast to this, when reducing the light-emitting diode quantity be connected in series, although voltage required when can reduce startup, more fatal problem can occur, that allows light-emitting diode bear overcurrent and shorten its life-span exactly.And the change in voltage of AC power can cause above-mentioned optical efficiency to decline and overcurrent phenomenon.
Therefore, therefore need to develop the light-emitting diode assembly with following effect, that is, the light-emitting diode assembly of the production cost that is not subject to the voltage variations affect of power supply, increases optical efficiency, reduces total harmonic distortion, prevents overcurrent, reduces.
Fig. 1 shows the alternating-current light emitting diode drive circuit that rectifier diode Dr and current regulating resistance Rr and light-emitting diode De is connected in series.Fig. 2 shows the AC supply voltage V that Fig. 1 applies
aCwith electric current I
aC, commutating voltage Vcc and the electric current I cc waveform that flows.
As shown in Figure 1, AC power V
aCcommutating voltage Vcc is allowed to be applied to light-emitting diode De through resistance Rr by the form being rectified diode Dr full-wave rectification.The forward threshold voltage sum of basic light-emitting diode contained by the forward threshold voltage light-emitting diode De of the light-emitting diode De be connected in series) below, electric current I cc can not had to flow at certain hour t1, t3 as illustrated in fig. 2.T2 when commutating voltage Vcc is greater than forward threshold voltage Vth, electric current I cc starts flowing, the electric current I cc sizableness of flowing in the difference of commutating voltage Vcc and forward threshold voltage Vth divided by resistance Rr, therefore, when input rectifying voltage increases, the electric current flowing through light-emitting diode may be greater than maximum permissible current.
Required voltage during connection, namely forward threshold voltage Vth can be along with the basic light-emitting diode quantity be connected in series ratio increase, thus make the connection of light-emitting diode interval shorten and allow total harmonic distortion (Total Harmonics Distortion, THD) increase and reduce optical efficiency, when reducing forward threshold voltage or increase supply voltage, the electric current exceeding allowable current can be allowed to shorten its life-span through light-emitting diode and reduce reliability.
Above-mentioned total harmonic distortion is worldwide restricted owing to causing the dry ripple of various electricity, need when the optical efficiency of light-emitting diode declines to use more light-emitting diode for fall, when therefore producing a certain amount of light-emitting device, required cost also can and then increase.
Fig. 3 shows the alternating-current light emitting diode drive circuit improving total harmonic distortion THD, first light-emitting diode Da and the second light-emitting diode Db of inverse parallel form are connected in series in current regulating resistance R, the electric capacity C1 improving total harmonic distortion is formed in the tie point na between resistance R and the first light-emitting diode Da, the tie point nb between the first light-emitting diode Da and the second light-emitting diode Db, power supply V
aClight-emitting diode is directly connected to through resistance when there is no rectifier diode.
Fig. 4 shows the voltage V being applied to light-emitting diode shown in Fig. 3
aCwith electric current I
aC, voltage waveform Vcc, by first light-emitting diode Da flow current waveform IDa and by second light-emitting diode Db flow current waveform IDb.
First light-emitting diode Da does not have electric current to pass through when below forward threshold voltage Vth.During more than forward threshold voltage Vth, forward first light-emitting diode Da2 in positive half period in the first light-emitting diode Da has electric current I Da2 to flow, and in negative half-cycle, reverse first light-emitting diode Da1 has electric current I Da1 flow and become the first LED current Ida.
Second light-emitting diode Db also can allow charging current process when voltage rises towards positive direction by electric capacity C1 when below forward threshold voltage Vth, also discharging current can be allowed to pass through by electric capacity C1 when rising towards negative direction.
During more than forward threshold voltage Vth, in positive half period, there is electric current I Db2 to pass through by forward first light-emitting diode Da2 at forward second light-emitting diode Db2, in negative half-cycle, there is electric current I Db1 process by reverse first light-emitting diode Da1 at reverse second light-emitting diode Db1, thus become the second LED current Idb.But during voltage drop, do not have the C1 electric current process by electric capacity, during below threshold voltage vt h, do not have electric current the same as the first light-emitting diode Da passes through.
When supply voltage rises, produce charging and discharging currents by the second light-emitting diode Db at electric capacity C1 and make at power supply V
aCthe electric current I of flowing
aCtotal harmonic distortion obtain improvement to a certain degree, but the electric capacity life-span is shorter and need bear high voltage, and electric capacity not only price is higher, and its size also makes product be difficult to miniaturization.
And, the charging and discharging currents flowing of the electric capacity C1 of total harmonic distortion just can only can be improved on the second light-emitting diode Db of half being equivalent to light-emitting diode used, therefore the electric current flowing through the second light-emitting diode Db is greater than the electric current flowing through the first light-emitting diode Da, can form overcurrent and cannot be the glow current that light-emitting diode supply is enough when supplying the first light-emitting diode Da with maximum current at the second light-emitting diode Db.
Therefore, the maximum permissible current of basic light-emitting diode cannot be allowed to flow through the first light-emitting diode Da and the second light-emitting diode, thus optical efficiency is declined.
And, supply voltage V
aCwhen being subject to the impact of change in voltage and increasing, the current value flowing through first and second light-emitting diode can be greater than maximum permissible current value, therefore considers change in voltage and the electric current flowing through light-emitting diode cannot be allowed to reach maximum permissible value, thus reduces optical efficiency.
The problem of above-mentioned prior art can arrange as follows, in order to improve total harmonic distortion, even if also allow certain source current I below the forward threshold voltage of light-emitting diode
aCflowing, but electric current only can be allowed to flow in a part for light-emitting diode, the maximum permissible current of separate radiation diode cannot be allowed to flow and optical efficiency is declined; High-voltage electrical is used to hold in order to reduce total harmonic distortion, but increase production cost because the electric capacity life-span is shorter, price is more expensive, the change in voltage of supply voltage makes the current value flowing through light-emitting diode exceed maximum permissible current value when causing voltage to raise, and then shorten the life-span of light-emitting diode.
The technical problem to be addressed by invention
In order to solve the problem, the object of this invention is to provide and exchange direct coupled type light emitting diode illuminating apparatus, it can regulate the connection scope in a power cycle, allows certain electric current flow through light-emitting diode and be improved total harmonic distortion and optical efficiency below forward threshold voltage.
Another object of the present invention is to provide and exchanges direct coupled type light emitting diode illuminating apparatus, and it forms a semiconductor device and is minimized production cost.
Solve the technical scheme of problem
In order to solve above-mentioned existing issue and realize above-mentioned purpose, light emitting diode illuminating apparatus of the present invention comprises rectifier diode AC power being converted to DC power supply, the first light-emitting diode be made up of more than one light-emitting diode and the second light-emitting diode be made up of more than one light-emitting diode, it is characterized in that comprising: the first constant-current circuit, allow certain electric current flow through first, second light-emitting diode above-mentioned; Current detection circuit, detects the detection electric current being flowed to the second light-emitting diode by above-mentioned first light-emitting diode; Second constant-current circuit, when the detection electric current flowing to the second light-emitting diode by above-mentioned first light-emitting diode does not exist, is that the first light-emitting diode supplies the second continuous current; And the 3rd constant-current circuit, when the detection electric current flowing to the second light-emitting diode by above-mentioned first light-emitting diode does not exist, be the second light-emitting diode supply the 3rd continuous current.
In the present invention, above-mentioned first constant-current circuit is connected between rectifier diode and the first light-emitting diode.
In the present invention, above-mentioned first constant-current circuit is connected between the first light-emitting diode and current detection circuit.
In the present invention, above-mentioned first constant-current circuit is connected between current detection circuit and the second light-emitting diode.
In the present invention, above-mentioned first constant-current circuit is connected in series the second light-emitting diode.
In the present invention, above-mentioned first constant-current circuit is made up of a JFET.
In the present invention, above-mentioned first constant-current circuit is made up of CRD Current Regulator Diode.
In the present invention, above-mentioned first constant-current circuit is made up of an a JFET and BJT or the 2nd BJT.
In the present invention, above-mentioned first constant-current circuit by comprise a BJT or the 2nd BJT, the first resistance, the second resistance, the first diode, the second diode BCR Bipolar Current Regulator form.
In the present invention, the 3rd diode of above-mentioned current detection circuit is connected with the 3rd resistance and the 4th resistant series.
In the present invention, above-mentioned second constant-current circuit has current sense terminal, current input terminal, current output terminal, also comprises: constant-current circuit, is made up of the 2nd JFET; Detect current level translation circuit, detected electric current by the 5th BJT of the current potential of change detection electric current and maintain certain the 5th JFET and form with allowing; Current detection circuit, by detecting the 3rd JFET of electric current and providing the 5th resistance of reference potential to form; Output current regulating circuit, is formed by detecting the 4th JFET of output current, the 4th diode adjusting reference potential, the 6th resistance and the 7th resistance; And output current amplifying circuit, be made up of the 3rd BJT.
In the present invention, above-mentioned output current regulating circuit also comprises the 5th diode and is connected with the 4th Diode series.
In the present invention, above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
In the present invention, above-mentioned output current regulating circuit also comprises the 5th diode and is connected with the 4th Diode series, and above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
In the present invention, above-mentioned 3rd constant-current circuit has detection current reference terminal, current sense terminal, current input terminal, current output terminal, also comprises: constant-current circuit, is made up of the 2nd JFET; Current detection circuit, by detecting the 3rd JFET of electric current and providing the 5th resistance of reference potential to form; Output current regulating circuit, is formed by detecting the 4th JFET of output current, the 4th diode adjusting reference potential, the 6th resistance and the 7th resistance; And output current amplifying circuit, be made up of the 3rd BJT.
In the present invention, above-mentioned output current regulating circuit also comprises the 5th diode and is connected with the 4th Diode series.
In the present invention, above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
In the present invention, above-mentioned output current regulating circuit also comprises the 5th diode and is connected with the 4th Diode series, and above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
Beneficial effect
As previously mentioned, the present invention can realize current switch (Switch), the electric current flowing through light-emitting diode is detected when being applied with AC power, if below light-emitting diode threshold voltage, allow electric current through all light-emitting diodes, exchange total harmonic distortion and optical efficiency therefore, it is possible to regulate easily.
And the higher and overcurrent that can prevent change in voltage from causing of optical efficiency of the present invention and be improved the reliability of lighting device, can also improve total harmonic distortion.
Accompanying drawing explanation
Fig. 1 is the embodiment of existing interchange light emitting diode illuminating apparatus.
Fig. 2 is the waveform of electric current shown in Fig. 1 and voltage characteristic.
Fig. 3 is another embodiment of existing interchange light emitting diode illuminating apparatus.
Fig. 4 is the waveform of electric current shown in Fig. 3 and voltage characteristic.
Fig. 5 is the embodiment that the present invention exchanges direct coupled type light emitting diode illuminating apparatus.
Fig. 6 is showing the waveform of electric current shown in Fig. 5 and voltage characteristic.
The circuit diagram being suitable for result that Fig. 7 is the first constant-current circuit shown in Fig. 5, current detection circuit, the second constant-current circuit, the 3rd constant-current circuit are applicable to embodiment.
Fig. 8 a to Fig. 8 c is the different embodiment in the position of the first constant-current circuit shown in Fig. 5.
Fig. 9 a to Fig. 9 e is another embodiment of the first constant-current circuit shown in Fig. 5.
Figure 10 a to Figure 10 b is another embodiment of current detection circuit shown in Fig. 5.
Figure 11 a to Figure 11 c is another embodiment of the second constant-current circuit shown in Fig. 5.
Figure 12 a to Figure 12 c is another embodiment of the 3rd constant-current circuit shown in Fig. 5.
Embodiment
Preferred embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 5 is the circuit diagram that the present invention exchanges direct coupled type light emitting diode illuminating apparatus, and Fig. 6 is showing the waveform of electric current shown in Fig. 5 and voltage characteristic.
Refer to Fig. 5 and Fig. 6, utilize rectifier diode 10 the AC power V being fed at home general or office
aCbe transformed into DC power supply, that is the power Vcc of rectification has commutating voltage 11 morphological character of some cycles as illustrated in fig. 6.
Above-mentioned power Vcc voltage is supplied to the first constant-current circuit 100 be connected in series, the first light-emitting diode 20 be made up of more than one light-emitting diode, current detection circuit 200, the second light-emitting diode 21 of being made up of more than one light-emitting diode, have glow current time more than the forward threshold voltage of above-mentioned cascaded structure, namely detect electric current 12 and pass through.Time more than threshold voltage, voltage increases the electric current caused exponentially can increase according to the physical characteristic of diode functional expression, therefore allows electric current maintain the effect of the first constant-current circuit 100 flowed definitely extremely important.
Above-mentioned first constant-current circuit 100 is made up of power input terminal a and the lead-out terminal b exporting certain electric current, although resistance can be utilized when not having the first constant-current circuit 100 to prevent overcurrent to a certain extent, but the overcurrent that mains voltage variations causes can allow the life-span of lighting device significantly shorten, if formed safely under above-mentioned overcurrent, then the supply voltage of the single cycle luminous cycle is caused to shorten and optical efficiency is declined.
But, above-mentioned first constant-current circuit 100 can not be increased the light period in single power supply cycle dramatically by the commutating voltage Vcc variable effect ground certain electric current of supply, the maximum current can also allowed with light-emitting diode for induced current, thus can allow the life-span of lighting device and optical efficiency be optimized.
Now, above-mentioned first constant-current circuit 100 uses after being connected with a certain circuit connected in series in rectifier diode 10, first light-emitting diode 20, second light-emitting diode 21 as shown in Fig. 8 a to Fig. 8 c.That is, above-mentioned first constant-current circuit 100 between to be connected in rectifier diode 10 and the first light-emitting diode 20, first light-emitting diode 10 and current detection circuit 200, current detection circuit 200 and the second light-emitting diode 21 some after use, or be connected in series rear use with the second light-emitting diode 21.As illustrated in fig. 6, only by commutating voltage 11 and when detecting electric current 12 action, there will be the total harmonic distortion phenomenon causing various electric clutter relative to the current characteristics of voltage.
As the method reducing this total harmonic distortion phenomenon, time below forward threshold voltage, that is detect electric current and rely on the detection current circuit 200 of Fig. 5 and the second constant-current circuit 300 to be while the first light-emitting diode 20 supplies certain electric current (the second continuous current) when not existing, by means of the 3rd constant-current circuit 400 for the second light-emitting diode 21 supplies certain electric current i.e. the 3rd continuous current and provide extra current 13, thus improve total harmonic distortion, power factor (power factor) and optical efficiency.
Now, the magnitude of current is the second continuous current and the 3rd continuous current sum, presents before and after the detection electric current 12 of Fig. 6 with extra current 13 waveform morphology, and operation voltage is then in threshold voltage vt h and half interval action of threshold voltage 1/2Vth.
Above-mentioned detection current circuit 200 is by being connected to the current input terminal c of the first light-emitting diode 20, the current output terminal d being connected to the second circuit of LED 21, the first detection terminal e being connected to the second constant-current circuit 300 and the second detection terminal f of being connected to the 3rd constant-current circuit 400 is formed, when the electric current that input terminal c and lead-out terminal d flows through, to voltage be there is at detection terminal e, f and disconnect the electric current of the second constant-current circuit 300 and the 3rd constant-current circuit 400.
Above-mentioned second constant-current circuit 300 is by the continuous current input terminal j of the tie point n2 be connected between the first light-emitting diode 20 and detection current circuit 200, be connected to the continuous current lead-out terminal m of the reference voltage GND of supply voltage, the detection current input terminal k being connected to the first detection terminal d detecting the current circuit 200 and detection current reference terminal l being connected to the tie point n3 detected between current circuit 200 and the second light-emitting diode 21 is formed, as detecting circuit when electric current does not exist, the first light-emitting diode 20 being supplied to certain electric current, the voltage vcc of rectification from about the half of forward threshold voltage to forward threshold voltage, that is, detect when electric current does not exist and supply certain electric current to the first light-emitting diode 20.
Above-mentioned 3rd constant-current circuit 400 is by the continuous current input terminal g being connected to commutating voltage Vcc terminal n1, the continuous current lead-out terminal i being connected to the tie point n3 detected between current circuit 200 and the second light-emitting diode 21 and detection current input terminal h being connected to the second detection terminal d detecting current circuit 200 is formed, the same with above-mentioned second constant-current circuit 300, as detecting circuit when electric current does not exist, the second light-emitting diode 21 being supplied to certain electric current, the voltage vcc of rectification is that the second light-emitting diode 21 supplies certain electric current from about the half of forward threshold voltage to detection current flowing.
The circuit diagram being suitable for result that Fig. 7 is the first constant-current circuit shown in Fig. 5, current detection circuit, the second constant-current circuit, the 3rd constant-current circuit are applicable to embodiment.
Refer to Fig. 7, the first constant-current circuit 100a is made up of a JFET J1, and gate terminal is connected to source terminal and makes grid voltage certain and realize continuous current.
Current detection circuit 200a is made up of resistance R3 and diode D3, and occur detect current potential and detected electric current at resistance R3 two ends when detecting current flowing, diode D3 can allow the first light-emitting diode 20 form being separated in electricity with the second light-emitting diode 21.
Second constant-current circuit 300a comprises: the constant-current circuit 510 be made up of the 2nd JFET J2; Detected electric current by the 5th BJT Q5 of the current potential of change detection electric current and maintain the detection current level translation circuit 550 that certain the 5th JFET J5 forms with allowing; By detecting the 3rd JFET J3 of electric current and providing the 5th resistance R5 of the reference potential of the 3rd JFET J3 current detection circuit 520 formed; By detect output current the 4th JFET J4, regulate the 4th diode D4 of the reference potential of above-mentioned 4th JFET J4, the 6th resistance R6 and detect the output current regulating circuit 530 that the 7th resistance R7 of the second continuous current forms; The output current amplifying circuit 540 be made up of the 3rd BJT Q3.
3rd constant-current circuit 400a comprises: the constant-current circuit 510 be made up of the 2nd JFET J2; By detecting the 3rd JFET J3 of electric current and providing the 5th resistance R5 of the reference potential of the 3rd JFET J3 current detection circuit 520 formed; By detect output current the 4th JFET J4, regulate the 4th diode D4 of the reference potential of above-mentioned 4th JFET J4, the 6th resistance R6 and detect the output current regulating circuit 530 that the 7th resistance R7 of the 3rd continuous current forms; The output current amplifying circuit 540 be made up of the 3rd BJT Q3.
Below in conjunction with Fig. 5 to Fig. 7, elemental motion principle is described, when commutating voltage Vcc is less than half threshold voltage 1/2Vth, the first constant-current circuit 100, second constant-current circuit 300 and the 3rd constant-current circuit 400 do not take action, and therefore LED does not also take action.
When commutating voltage Vcc is greater than half threshold voltage 1/2Vth and is less than threshold voltage vt h, be subject to the second constant-current circuit 300,300a and the 3rd constant-current circuit 400, the restriction of 400a and allow extra current 13 flow, when commutating voltage Vcc is greater than threshold voltage vt h, be subject to the first constant-current circuit 100,100a restriction and allow detect electric current 12 flow.
When commutating voltage Vcc is greater than threshold voltage vt h and is greater than the second constant-current circuit 300,300a and the 3rd constant-current circuit 400,400a sum, become from extra current 13 flow transition to the change point detecting electric current 12 flowing.
Fig. 9 a is the embodiment of the first constant-current circuit 100a shown in Fig. 7, and the first constant-current circuit 100b is realized by CRD Current Regulator Diode.
Fig. 9 b is another embodiment of the first constant-current circuit 100a shown in Fig. 7, and the first constant-current circuit 100c is made up of a JFET J1 and a PNP BJT Q1, by a PNP BJT Q1, the electric current flowing through an above-mentioned JFET J1 is amplified rear realization.
Fig. 9 c is another embodiment of the first constant-current circuit 100a shown in Fig. 7, and the first constant-current circuit 100d is made up of a JFET J1 and the 2nd NPN BJT Q2, by the 2nd NPN BJT Q2, the electric current flowing through an above-mentioned JFET J1 is amplified rear realization.
Fig. 9 d is another embodiment of the first constant-current circuit 100a shown in Fig. 7, first constant-current circuit 100e is by comprising the first resistance R1, second resistance R2, first diode D1, the BCR Bipolar Current Regulator of the second diode D2 and a PNP BJT Q1 is formed, above-mentioned first diode D1 and the second diode D2 is connected in series and forms certain threshold voltage and flow definitely to allow the electric current flowing through the first resistance R1 maintain and amplified by a PNP BJT Q1, second resistance R2 is then that the base terminal of a PNP BJT Q1 changes voltage with being formed continuous current action.
Fig. 9 e is another embodiment of the first constant-current circuit 100a shown in Fig. 7, first constant-current circuit 100f by comprising the first resistance R1, the second resistance R2, the BCR of the first diode D1, the second diode D2 and the 2nd NPN BJT Q2 forms, above-mentioned first diode D1 and the second diode D2 is connected in series and forms certain threshold voltage and amplified by the 2nd NPN BJT Q2 to allow the electric current flowing through the first resistance R1 maintain to flow definitely, and the second resistance R2 is then that the base terminal of the 2nd NPN BJT Q2 changes voltage with being formed continuous current action.
Figure 10 a is the embodiment of the 200a of current detection circuit shown in Fig. 7,3rd resistance R3, the 3rd diode D3 of current detection circuit 200b and the 4th resistance R4 are connected in series, when the electric current being input to input terminal c flows to lead-out terminal d by the 3rd resistance R3, the 3rd diode D3 and the 4th resistance R4, allow the first detection terminal e and the second detection terminal f formation voltage.
Figure 10 b is another embodiment of the 200a of current detection circuit shown in Fig. 7,3rd diode D3, the 3rd resistance R3 of current detection circuit 200c and the 4th resistance R4 are connected in series, when the electric current being input to input terminal c flows to lead-out terminal d by the 3rd resistance R3, the 3rd diode D3 and the 4th resistance R4, allow the first detection terminal e and the second detection terminal f formation voltage.
Figure 11 a is the embodiment of the second constant-current circuit 300a shown in Fig. 7, and in the second constant-current circuit 300b, output current amplifying circuit 541 is formed Darlington transistor Darlington structure by the 4th BJT and the 3rd BJT Q3 and increased current amplification degree.
Figure 11 b is another embodiment of the second constant-current circuit 300a shown in Fig. 7, and in the second constant-current circuit 300c, output current regulating circuit 531 is connected in series the 4th diode D4 and the 5th diode D5 and changes adjustment current potential.
Figure 11 c is another embodiment of the second constant-current circuit 300a shown in Fig. 7, in the second constant-current circuit 300d, output current amplifying circuit 541 is formed Darlington transistor structure by the 4th BJT and the 3rd BJT Q3 and is increased current amplification degree, and output current regulating circuit 531 is connected in series the 4th diode D4 and the 5th diode D5 and changes adjustment current potential.
Figure 12 a is the embodiment of the 3rd constant-current circuit 400a shown in Fig. 7, and in the 3rd constant-current circuit 400b, output current amplifying circuit 541 is formed Darlington transistor structure by the 4th BJT Q3 and the 3rd BJT Q3 and increased current amplification degree.
Figure 12 b is another embodiment of the 3rd constant-current circuit 400a shown in Fig. 7, and in the 3rd constant-current circuit 400c, output current regulating circuit 531 allows the 4th diode D4 and the 5th diode D5 be connected in series and to change adjustment current potential.
Figure 12 c is another embodiment of the 3rd constant-current circuit 400a shown in Fig. 7, in the 3rd constant-current circuit 400d, output current amplifying circuit 541 is formed Darlington transistor structure by the 4th BJT Q3 and the 3rd BJT Q3 and is increased current amplification degree, and output current regulating circuit 531 allows the 4th diode D4 and the 5th diode D5 be connected in series and to change adjustment current potential.
With embodiment, preferred embodiment of the present invention is described by reference to the accompanying drawings above, various distortion and amendment can be realized in technological thought category of the present invention, this is obviously to those skilled in the art, therefore therefore interest field of the present invention must not be defined in this, should determine according to claims and equivalency range thereof.
The explanation > of < main graphical mark
10: rectifier diode 11: commutating voltage
12: detect electric current 13: extra current
20: the first light-emitting diode 21: the second light-emitting diodes
100: the first constant-current circuits 200: current detection circuit
300: the second constant-current circuit 400: the three constant-current circuits
Claims (16)
1. one kind exchanges direct coupled type light emitting diode illuminating apparatus, this light emitting diode illuminating apparatus comprises the second light-emitting diode be made up of more than one light-emitting diode that AC power is converted to the rectifier diode of DC power supply, the first light-emitting diode be made up of more than one light-emitting diode and connects with the first light-emitting diode, it is characterized in that comprising:
First constant-current circuit, allows certain electric current flow through above-mentioned first light-emitting diode, the second light-emitting diode;
Current detection circuit, detects the detection electric current being flowed to the second light-emitting diode by above-mentioned first light-emitting diode;
Second constant-current circuit, when the detection electric current flowing to the second light-emitting diode by above-mentioned first light-emitting diode does not exist, is that the first light-emitting diode supplies the second continuous current; And
3rd constant-current circuit, when the detection electric current flowing to the second light-emitting diode by above-mentioned first light-emitting diode does not exist, is the second light-emitting diode supply the 3rd continuous current;
Wherein have current sense terminal, current input terminal, current output terminal above-mentioned second constant-current circuit comprise: constant-current circuit, is made up of the 2nd JFET; Detect current level translation circuit, detected electric current by the 5th BJT of the current potential of change detection electric current and maintain certain the 5th JFET and form with allowing; Current detection circuit, by detecting the 3rd JFET of electric current and providing the 5th resistance of reference potential to form; Output current regulating circuit, is formed by detecting the 4th JFET of output current, the 4th diode adjusting reference potential, the 6th resistance and the 7th resistance; And output current amplifying circuit, be made up of the 3rd BJT; Described constant-current circuit is connected with described current detection circuit between two with described output current regulating circuit, and described constant-current circuit, output current amplifying circuit, output current regulating circuit, current detection circuit are connected with detection current level translation circuit order;
Have detect current reference terminal, current sense terminal, current input terminal, current output terminal above-mentioned 3rd constant-current circuit comprise: constant-current circuit, is made up of the 2nd JFET; Current detection circuit, by detecting the 3rd JFET of electric current and providing the 5th resistance of reference potential to form; Output current regulating circuit, is formed by detecting the 4th JFET of output current, the 4th diode adjusting reference potential, the 6th resistance and the 7th resistance; And output current amplifying circuit, be made up of the 3rd BJT; Described constant-current circuit is connected with described output current regulating circuit between two with described current detection circuit, and described output current regulating circuit is connected with described output current amplifying circuit respectively with described current detection circuit.
2. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is connected between rectifier diode and the first light-emitting diode.
3. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is connected between the first light-emitting diode and current detection circuit.
4. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is connected between current detection circuit and the second light-emitting diode.
5. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is connected in series the second light-emitting diode.
6. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is made up of a JFET.
7. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is made up of CRD (Current Regulator Diode).
8. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit is made up of an a JFET and BJT or the 2nd BJT.
9. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
Above-mentioned first constant-current circuit by comprise a BJT or the 2nd BJT, the first resistance, the second resistance, the first diode, the second diode BCR (Bipolar Current Regulator) form;
Described first diode D1 and the second diode D2 is connected in series and forms certain threshold voltage and amplified by a PNP BJT Q1 or the 2nd NPN BJT Q2 to allow the electric current flowing through the first resistance R1 maintain to flow definitely, and the second resistance R2 is then that the base terminal of a PNP BJT Q1 or the 2nd NPN BJT Q2 changes voltage with being formed continuous current action.
10. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
3rd diode of above-mentioned current detection circuit, the 3rd resistance and the 4th resistant series connect.
11. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current regulating circuit of above-mentioned second constant-current circuit also comprises the 5th diode and is connected with the 4th Diode series.
12. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current amplifying circuit of above-mentioned second constant-current circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
13. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current regulating circuit of above-mentioned second constant-current circuit also comprises the 5th diode and is connected with the 4th Diode series, and above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
14. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current regulating circuit of above-mentioned 3rd constant-current circuit also comprises the 5th diode and is connected with the 4th Diode series.
15. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current amplifying circuit of above-mentioned 3rd constant-current circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
16. interchange direct coupled type light emitting diode illuminating apparatus according to claim 1, is characterized in that,
The output current regulating circuit of above-mentioned 3rd constant-current circuit also comprises the 5th diode and is connected with the 4th Diode series, and above-mentioned output current amplifying circuit also comprises the 4th BJT and forms Darlington transistor structure with the 3rd BJT.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020110128716A KR101128680B1 (en) | 2011-12-05 | 2011-12-05 | Ac direct coupled led lighting device |
| KR10-2011-0128716 | 2011-12-05 |
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| CN103139982A CN103139982A (en) | 2013-06-05 |
| CN103139982B true CN103139982B (en) | 2015-05-20 |
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| Country | Link |
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| KR (1) | KR101128680B1 (en) |
| CN (1) | CN103139982B (en) |
| WO (1) | WO2013085158A1 (en) |
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| KR101298486B1 (en) | 2012-05-31 | 2013-08-21 | 주식회사 실리콘웍스 | Led lighting system and control circuit thereof |
| KR101478782B1 (en) * | 2012-10-30 | 2015-01-02 | 한국전기연구원 | LED Driving Circuit for AC Driving and Dimming Based on Constant Current of Sine Wave |
| CN103096591B (en) * | 2013-01-07 | 2015-01-28 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional type negative sinusoidal current |
| CN103096592B (en) * | 2013-01-07 | 2015-01-28 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional indentation type current |
| KR101301087B1 (en) * | 2013-03-06 | 2013-08-28 | (주) 알에프세미 | Apparatus for driving light emitting diode |
| US9113523B2 (en) | 2013-05-15 | 2015-08-18 | Iml International | Light-emitting diode lighting device having multiple driving stages |
| CN104284488A (en) * | 2014-09-28 | 2015-01-14 | 大连工业大学 | Method for designing alternating-current light-emitting diode circuit |
| CN105792443B (en) * | 2016-05-06 | 2017-07-07 | 熊晓丹 | It is driving IC power supply circuits in a kind of LED power |
| CN106793253B (en) * | 2016-11-24 | 2018-12-28 | 深圳市明微电子股份有限公司 | A kind of LED linear constant-current drive circuit and LED light device |
| KR102003365B1 (en) | 2017-05-24 | 2019-07-24 | 그린칩 주식회사 | Driving apparatus for light emitting diode |
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| CN103139982A (en) | 2013-06-05 |
| KR101128680B1 (en) | 2012-03-23 |
| WO2013085158A1 (en) | 2013-06-13 |
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