CN106102258B - The AC Driving System and driving method of LED light source - Google Patents
The AC Driving System and driving method of LED light source Download PDFInfo
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- CN106102258B CN106102258B CN201610678092.8A CN201610678092A CN106102258B CN 106102258 B CN106102258 B CN 106102258B CN 201610678092 A CN201610678092 A CN 201610678092A CN 106102258 B CN106102258 B CN 106102258B
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- led light
- light string
- power source
- logic switch
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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
- H05B45/37—Converter circuits
-
- 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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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
The present invention discloses the AC Driving System and driving method of a kind of LED light source, the system includes: AC power source, voltage detection unit, control unit, first LED light string, second LED light string, first logic switch, second logic switch, diode and constant-current source, voltage detection unit is connected to AC power source both ends, control unit is connected to AC power source both ends, voltage detection unit is also electrically connected with control unit, first LED light string one end is connect with constant-current source one end, the other end respectively with diode cathode, the connection of first logic switch one end, the first logic switch other end is connect with AC power source one end, the constant-current source other end is connect with the AC power source other end, second logic switch one end is connect with constant-current source one end, the other end respectively with the anode of diode, the connection of second LED light string one end, second LED light One end of the string other end and AC power source connects, and control unit is connect with the first logic switch, the second logic switch respectively.
Description
Technical field
The present invention relates to the AC Driving Systems and driving side of field of LED drive technology more particularly to a kind of LED light source
Method.
Background technique
LED(Light Emitting Diode, light emitting diode) it is that one kind can convert electrical energy into consolidating for visible light
The semiconductor devices of state, it can directly be converted electricity to light.LED has that small in size, driving voltage is low, long service life, bright
The features such as degree height, energy conservation and environmental protection, to be rapidly developed.
In prior art driving device, the AC-input voltage and AC input current that power supply generates, usual light source exist
In use process, the work relationship of voltage and time is at sinusoidal waveform, and the square wave region in the sinusoidal waveform is conducting area, as
LED light source acting area, now there are two types of the linear constant current drive modes of LED industry: another one is single hop constant current drive mode
Kind is multistage driving method.
Single hop constant current drive mode: which includes two ways, and first way is as shown in Figure 1, increase LED light source
Duty ratio, although this form has reached, the circuit debugging time is long, and cathode performance increases, and idle power consumption area is very
Greatly, therefore the power very little of light source is caused；The second way is as shown in Fig. 2, reduce duty ratio, although reducing idle power consumption
Area, but the LED light source working time is extremely short, is also unable to get beneficial effect.
Multistage driving method: it referring to Fig. 3, LED light is divided into multistage, is led needed for voltage rises to certain section of LED light
When the pressure that is powered, signal control module just outputs signal to the constant-current driven module of this section, and at the same time, the constant current of leading portion drives mould
Block stops working, and the constant-current driven module of this section is the LED light for supplying electricity to first segment to this section, the LED light of first segment to this section
ON operation can increase the mechanical efficiency of LED light source within the identical working time.But such multistage LED light is with voltage
Waveform rises and drives the mode lighted paragraph by paragraph, and during first segment is lighted, second to the 4th section all due to not arriving required lead
It is powered and presses and cannot light；During lighting to second segment, third to the 4th section all cannot due to not arriving required conducting voltage
It lights, and so on, the utilization rate of such LED light can be very low.
Therefore, the prior art is defective, needs to improve.
Summary of the invention
The purpose of the present invention is overcome the deficiencies of the prior art and provide the AC Driving System and driving of a kind of LED light source
Method.
Technical scheme is as follows: the present invention provides a kind of AC Driving System of LED light source, comprising: alternating current
Source, voltage detection unit, control unit, the first LED light string, the second LED light string, the first logic switch, the second logic switch, two
Pole pipe and constant-current source, the voltage detection unit are connected to the AC power source both ends, and described control unit is connected to the exchange
Both ends of power, the voltage detection unit are also electrically connected with described control unit, first LED light string one end and the perseverance
The one end in stream source connects, and the other end is connect with one end of the cathode of diode, the first logic switch respectively, and first logic is opened
The other end of pass is connect with one end of the AC power source, and the other end of the other end of the constant-current source and the AC power source connects
Connect, second logic switch one end is connect with one end of the constant-current source, the other end respectively with the anode of diode, second
One end of LED light string connects, and the other end of second LED light string is connect with one end of the AC power source, and the control is single
Member is connect with first logic switch, the second logic switch respectively.
Wherein, the conducting voltage of first LED light string is Vf1, and the conducting voltage of second LED light string is Vf2,
The sum of Vf1≤Vf2, Vf1 and Vf2 are less than or equal to the crest voltage of the AC power source.
Wherein, first logic switch and the second logic switch are metal-oxide-semiconductor.
Wherein, first LED light string includes several concatenated LED lamp beads, and second LED light string includes several series connection
LED lamp bead.
The present invention also provides a kind of AC driving methods of LED light source, comprising the following steps:
Step 11, control unit detect the output voltage values Vac of AC power source using voltage detection unit；
Step 12, AC power source output voltage Vac are incrementally increased, and increase to the conducting voltage equal to the first LED light string
When Vf1, described control unit controls the conducting of the first logic switch, the first LED light string is connected, so that the first LED light string shines；
Step 13, when the out-put supply Vac of AC power source be equal to the second LED light string conducting voltage Vf2 when, the control
Unit controls the conducting of the second logic switch, the second LED light string is connected, so that the second LED light string shines；
Step 14, AC power source output voltage Vac continue to increase, when increasing to equal to the sum of Vf1 and Vf2, control unit
It controls the first logic switch and the second logic switch is closed, first LED light string is connected with the second LED light string to be followed by described
The output end of AC power source.
Wherein, the conducting voltage Vf1 of first LED light string is less than or equal to the conducting voltage of second LED light string
It is less than or equal to the crest voltage of the AC power source for Vf2, the sum of Vf1 and Vf2.
Wherein, first logic switch and the second logic switch are metal-oxide-semiconductor.
Wherein, in the step 13, when the conducting of the second LED light string, second LED light string and the second LED light string are simultaneously
It is connected in the output end of the AC power source.
Wherein, first LED light string includes several concatenated LED lamp beads, and second LED light string includes several series connection
LED lamp bead.
Using the above scheme, the AC Driving System and driving method of LED light source of the invention, is opened by the first logic
It closes, the one-way conduction characteristic of the second logic switch and diode cooperates to control the first LED light string, the second LED light
It is connected in series or in parallel in the both ends of AC power source, so as to improve the utilization rate of LED light well.
Detailed description of the invention
Fig. 1 is the embodiment one of single hop constant current drive mode in the prior art.
Fig. 2 is the embodiment two of single hop constant current drive mode in the prior art.
Fig. 3 is the functional framework figure of multistage driving method in the prior art.
Fig. 4 is the schematic diagram of the AC Driving System of LED light source of the present invention.
Fig. 5 is the flow chart of the AC driving method of LED light source of the present invention.
Fig. 6 is the relation schematic diagram of the output voltage of AC power source and the electric current of the first LED light string.
Fig. 7 is the relation schematic diagram of the output voltage of AC power source and the electric current of the second LED light string.
Fig. 8 is the relation schematic diagram of the output voltage of AC power source and the total current of the first, second LED light string.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Referring to Fig. 4, the present invention provides a kind of AC Driving System of LED light source, comprising: AC power source 1, voltage detecting
Unit 2, control unit 3, the first LED light string 4, the second LED light string 5, the first logic switch 6, the second logic switch 7, diode 8
And constant-current source 9.The voltage detection unit 2 is connected to 1 both ends of AC power source, and described control unit 3 is connected to the exchange
1 both ends of power supply, the voltage detection unit 2 are also electrically connected with described control unit 3, described first LED light string, 4 one end and institute
One end connection of constant-current source 9 is stated, the other end connect with one end of the cathode of diode 8, the first logic switch 6 respectively, and described the
The other end of one logic switch 6 is connect with one end of the AC power source 1, the other end and the alternating current of the constant-current source 9
The other end in source 1 connects, and described second logic switch, 7 one end is connect with one end of the constant-current source 9, the other end respectively with two poles
One end connection of the anode of pipe 8, the second LED light string 5, the one of the other end of second LED light string 5 and the AC power source 1
End connection, described control unit 3 are also connect with first logic switch 6, the second logic switch 7 respectively.The present invention passes through the
The first LED of control is cooperated between the one-way conduction characteristic of one logic switch 6, the second logic switch 7 and diode 8
Lamp string 4, the second LED light string 5 are connected in series or in parallel in the both ends of AC power source 1, so as to improve the benefit of LED light well
With rate.
The conducting voltage of first LED light string 4 is Vf1, and the conducting voltage of second LED light string 5 is Vf2, Vf1≤
Vf2, by compare AC power source 1 real-time output voltage Vac and Vf1, Vf2 size relation come control the first LED light string 4 with
The on state of second LED light string 5.Preferably, the sum of Vf1 and Vf2 are less than or equal to the crest voltage of the AC power source 1,
It may insure that the first LED light string 4 and the second LED light string 5 can be connected in series in the both ends of AC power source 1 in this way.
Further, first logic switch 6 and the preferred selection metal-oxide-semiconductor of the second logic switch 7, grid and control are single
Member 3 links together, and described control unit 3 exports low and high level to control the working condition of metal-oxide-semiconductor.
First LED light string 4 includes several concatenated LED lamp beads, and second LED light string 5 includes several concatenated
LED lamp bead.
The AC Driving System of the LED light source includes that there are three types of on states: the first is that the first LED light string 4 is independent
It is connected to the both ends of the AC power source 1；Second is that the first LED light string 4 is followed by exchanging in described with 5 parallel connection of the second LED light string
The both ends of power supply 1；The third is that the first LED light string 4 is connected with the second LED light string 5 and is followed by the both ends of the AC power source 1,
The utilization rate of LED light can be effectively improved in this way.Referring to Fig. 5, specific driving method the following steps are included:
Step 11, control unit 3 detect the output voltage values Vac of AC power source 1 using voltage detection unit 2.
The AC power source 1 provides the alternating current that waveform is sine wave.
Step 12,1 output voltage Vac of AC power source are incrementally increased, and increase to the conducting voltage equal to the first LED light string 4
When Vf1, described control unit 3 controls the conducting of the first logic switch 6, the first LED light string 4 is connected, so that the first LED light string 4
It shines.
At this point, only the first LED light string 4 is connected in 1 both ends of AC power source, that is to say defeated 1 early period in AC power source
Out when low-voltage, only the first LED light string 4 works.
In the present embodiment, first logic switch 6 selects metal-oxide-semiconductor, and grid is connect with described control unit 3, institute
It states control unit 3 and exports low and high level to control its working condition.
Step 13, when the out-put supply Vac of AC power source 1 be equal to the second LED light string 5 conducting voltage Vf2 when, the control
Unit 3 processed controls the conducting of the second logic switch 7, the second LED light string 5 is connected, so that the second LED light string 5 shines.
In the present invention, the conducting voltage Vf1 of first LED light string 4 is less than or equal to leading for second LED light string 5
Be powered pressure be Vf2: when Vf1 be equal to Vf2 when, the second LED light string 5 is lighted simultaneously with the first LED light string 4, the two parallel connection connection in
1 both ends of AC power source；When Vf1 is less than Vf2, the first LED light string 4 is first connected in 1 both ends of AC power source work one
After the section time, the second LED light string 5 is connected again in 1 both ends of AC power source, at this point, the first LED light string 4 and the second LED light
String 5 is connected in 1 both ends of AC power source.
In addition, the sum of the conducting voltage Vf1 of the first LED light string 4 and the conducting voltage Vf2 of the second LED light string 5 are less than or wait
In the crest voltage of the AC power source 1.
In the present embodiment, second logic switch 7 selects metal-oxide-semiconductor, and grid is connect with described control unit 3, institute
It states control unit 3 and exports low and high level to control its working condition.
Step 14,1 output voltage Vac of AC power source continue to increase, when increasing to equal to the sum of Vf1 and Vf2, control unit
3 the first logic switches 6 of control and the second logic switch 7 are closed, and first LED light string 4 is connected with the second LED light string 5 and is followed by
In the output end of the AC power source 1.
First LED light string 4 is connect by two poles 8 with one-way conduction function with the second LED light string 5.
Later, the output voltage of the AC power source 1 continues to increase, i.e. Vac is greater than the sum of Vf1 and Vf2, control unit 3
The first logic switch 6 and the second logic switch 7 is controlled to close, first LED light string 4 connect with the second LED light string 5 be followed by
The output end of the AC power source 1.
Referring to Fig. 6, its relation schematic diagram for the output voltage of AC power source and the electric current of the first LED light string, from figure
In it can be seen that the first LED light string utilization rate.Fig. 7 is the pass of the output voltage of AC power source and the electric current of the second LED light string
It is schematic diagram, it can be with the utilization rate of the second LED light string from figure.Fig. 8 is the output voltage and the first, second LED of AC power source
The relation schematic diagram of the total current of lamp string from figure therefore can be seen that the utilization rate presentation of LED light is significantly promoted.
In conclusion the present invention provides the AC Driving System and driving method of a kind of LED light source, opened by the first logic
It closes, the one-way conduction characteristic of the second logic switch and diode cooperates to control the first LED light string, the second LED light
It is connected in series or in parallel in the both ends of AC power source, so as to improve the utilization rate of LED light well.
The above is merely preferred embodiments of the present invention, be not intended to restrict the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (3)
1. a kind of AC Driving System of LED light source characterized by comprising AC power source, voltage detection unit, control are single
Member, the first LED light string, the second LED light string, the first logic switch, the second logic switch, diode and constant-current source, the electricity
Pressure detection unit is connected to the AC power source both ends, and described control unit is connected to the AC power source both ends, the voltage detecting
Unit is also electrically connected with described control unit, and first LED light string one end is connect with one end of the constant-current source, the other end
It is connect respectively with one end of the cathode of diode, the first logic switch, the other end of first logic switch is exchanged with described
One end of power supply connects, and the other end of the constant-current source is connect with the other end of the AC power source, second logic switch
One end is connect with one end of the constant-current source, and the other end is connect with one end of the anode of diode, the second LED light string respectively, institute
The other end for stating the second LED light string is connect with one end of the AC power source, described control unit respectively with first logic
Switch, the connection of the second logic switch；
The conducting voltage of first LED light string is Vf1, and the conducting voltage of second LED light string is Vf2, Vf1 < Vf2,
The sum of Vf1 and Vf2 are less than or equal to the crest voltage of the AC power source:
The first LED light string and the is controlled by the size relation of the real-time output voltage Vac and Vf1, Vf2 that compare AC power source
The on state of two LED light strings；
As Vf1 < Vf2, the AC Driving System of the LED light source includes that there are three types of on states: the first is when the friendship
When the output voltage Vac in galvanic electricity source increases to the conducting voltage Vf1 equal to first LED light string, described control unit control
The first logic switch conducting, first LED light string is connected, the first LED light string is individually connected to the alternating current at this time
The both ends in source；It is for second to increase to equal to the second LED light string when the out-put supply Vac of the AC power source continues to increase
When conducting voltage Vf2, described control unit controls the conducting of the second logic switch, the second LED light string is connected, the first LED at this time
Lamp string and the second LED light are followed by series and parallel in the both ends of the AC power source；The third is the output electricity when the AC power source
Pressure Vac continues to increase, and when being increased above or being equal to the sum of Vf1 and Vf2, control unit controls the first logic switch and patrols with second
It collects switch to close, first LED light string is connected with the second LED light string to be followed by the both ends of the AC power source.
2. the AC Driving System of LED light source according to claim 1, which is characterized in that first logic switch with
Second logic switch is metal-oxide-semiconductor.
3. the AC Driving System of LED light source according to claim 1, which is characterized in that first LED light string includes
Several concatenated LED lamp beads, second LED light string include several concatenated LED lamp beads.
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| CN201610678092.8A CN106102258B (en) | 2016-08-17 | 2016-08-17 | The AC Driving System and driving method of LED light source |
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| CN201610678092.8A CN106102258B (en) | 2016-08-17 | 2016-08-17 | The AC Driving System and driving method of LED light source |
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| CN106102258B true CN106102258B (en) | 2019-03-01 |
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| CN213638295U (en) * | 2019-06-06 | 2021-07-06 | 上海路傲电子科技有限公司 | Double-base-island chip driving circuit, chip, linear constant current driving circuit and lighting device |
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