CN102917486A - LED lamp adjustable in luminance and color temperature - Google Patents
LED lamp adjustable in luminance and color temperature Download PDFInfo
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- CN102917486A CN102917486A CN2011102203219A CN201110220321A CN102917486A CN 102917486 A CN102917486 A CN 102917486A CN 2011102203219 A CN2011102203219 A CN 2011102203219A CN 201110220321 A CN201110220321 A CN 201110220321A CN 102917486 A CN102917486 A CN 102917486A
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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
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The invention discloses an LED lamp adjustable in luminance and color temperature. The LED lamp comprises a direct-current power module, an order receiving module, a control driving module, a first LED group, a second LED group, a first dimming module and a second dimming module. The order control module is used for receiving control orders; the control driving module is used for outputting a first PWM (pulse width modulation) signal and a second PWM signal according to the control orders received by the order receiving module; the first LED group and the second LED group are different in color temperature, LEDs in the first LED group and the second LED group are all white-light LEDs, and the LEDs in the same LED group are uniform in color temperature; the first dimming module is used for controlling operating states and luminance of the first LED group according to the first PWM signal; and the second dimming module is used for controlling operating states and luminance of the second LED group according to the second PWM signal. Production cost of the LED lamp is reduced while failure rate of the LED lamp is decreased, and occupancy of system resources is reduced.
Description
Technical field
The present invention relates to lighting technical field, more specifically, relate to the adjustable LED of a kind of brightness and colour temperature (Light Emitting Diode, light-emitting diode) light fixture.
Background technology
In recent years, along with the popularization of power-saving technology, the energy-saving lighting design has become the research emphasis of field of illuminating lamps.LED is subject to the people's attention in the energy-saving lighting design because it has the advantages such as luminous efficiency is high, good energy-conserving effect.Making illuminating lamp with LED and replace traditional illuminating lamp, is the development trend of current lighting technical field.
In order to satisfy the difference hobby of different people on colour temperature, the LED light fixture that can regulate colour temperature also comes out successively.At present, the LED lamp of adjustable color temperature adopts the LED luminous tube group of three kinds of colors of red, green, blue to realize more, what have has also added white LED luminous tube group in order to strengthen brightness, and the luminous tube group of every kind of color all is connected with power supply and LED luminous tube group drive circuit, chroma-luminance controller in turn.Export respectively 1 road signal by 4 LED luminous tube group drive circuits of chroma-luminance controller control, control luminosity and the operating state of versicolor LED luminous tube group, realize the adjusting of the colour temperature of LED light fixture.
But, in the LED light fixture of above-mentioned prior art, need to export respectively 1 road signal by 4 LED luminous tube group drive circuits of chroma-luminance controller control, be controlled one to one respectively the LED luminous tube group of 4 kinds of colors by this 4 road signal, circuit is very complicated, has increased production cost and failure rate.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of brightness and the adjustable LED light fixture of colour temperature, can solve the production cost and the high problem of failure rate that exist in the prior art.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the adjustable LED light fixture of a kind of brightness and colour temperature, comprising: DC power supplier; The command reception module is used for receiving control command; The control driver module for the control command that receives according to the command reception module, is exported the first pwm signal and the second pwm signal; The LED luminous tube group that colour temperature is different and the 2nd LED luminous tube group, the LED in a LED luminous tube group and the 2nd LED luminous tube group is white light LEDs, and the colour temperature of the LED in the same LED luminous tube group is identical; The first light-adjusting module is used for controlling according to the first pwm signal operating state and the brightness of a LED luminous tube group; And second light-adjusting module, be used for controlling according to the second pwm signal operating state and the brightness of the 2nd LED luminous tube group.
LED light fixture of the present invention has adopted two kinds of White LED luminous tube groups that colour temperature is different, and use the two-way pwm signal to control one to one respectively operating state and the brightness of the LED of these two groups of different-colours, because colour temperature is different, change respectively operating state and the brightness of two groups of White LEDs, can realize the adjusting of two kinds of different-colour mixing ratios, thereby reach the effect that changes brightness and colour temperature.In addition, owing to only needing the two-way pwm signal to control one to one two groups of White LEDs that colour temperature is different, greatly simplify circuit, thereby reduced production cost and failure rate, reduced taking system resource.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram according to the adjustable LED light fixture of the brightness of the embodiment of the invention one and colour temperature;
Fig. 2 shows the schematic diagram according to the adjustable LED light fixture of the brightness of the embodiment of the invention two and colour temperature;
Fig. 3 shows the circuit diagram according to first (or second) LED luminous tube group, the first (or second) light-adjusting module and first (or second) constant flow module of the embodiment of the invention three;
Fig. 4 shows the circuit diagram according to the adjustable LED light fixture of the brightness of the embodiment of the invention three and colour temperature;
Fig. 5 shows the circuit diagram according to the adjustable LED light fixture of the brightness of the embodiment of the invention four and colour temperature.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Embodiment one
Fig. 1 shows the schematic diagram according to the adjustable LED light fixture of the brightness of the embodiment of the invention one and colour temperature, as shown in Figure 1, this LED light fixture comprises: DC power supplier 10, command reception module 20, control driver module 30, a LED luminous tube group 40, the 2nd LED luminous tube group 50, the first light-adjusting module 60 and the second light-adjusting module 70, and annexation and the function of modules are as follows:
DC power supplier 10 is used to control driver module 30, a LED luminous tube group 40 and the 2nd LED luminous tube group 50 that operating voltage is provided;
Command reception module 20 be used for to receive control command, the control command of sending by remote controller such as, user or the control command of sending by other means, and restriction is not done in embodiment of the invention contrast;
Control driver module 30, are connected with the command reception module with DC power supplier 10 and are connected, for the control command that receives according to command reception module 20, output two-way PWM (Pulse-Width Modulation, pulse width modulation) signal is called: the first pwm signal and the second pwm signal;
The LED luminous tube group 40 that colour temperature is different and the 2nd LED luminous tube group 50, be connected with DC power supplier 10 respectively, wherein, the LED in a LED luminous tube group 40 and the 2nd LED luminous tube group 50 is white light LEDs, and the colour temperature of the LED in the same LED luminous tube group is identical;
The first light-adjusting module 60, with a LED luminous tube group 40 be connected driver module 30 and be connected, be used for controlling according to the first pwm signal operating state (comprise conducting (be luminous or open) and end (namely not luminous or close)) and the brightness of a LED luminous tube group 40; And
The second light-adjusting module 70, with the 2nd LED luminous tube group 50 be connected driver module 30 and be connected, be used for controlling according to the second pwm signal operating state (comprise conducting (be luminous or open) and end (namely not luminous or close)) and the brightness of the 2nd LED luminous tube group 50.
The LED light fixture of the embodiment of the invention has adopted two kinds of White LED luminous tube groups that colour temperature is different, and use the two-way pwm signal to control one to one respectively operating state and the brightness of the LED of these two groups of different-colours, because colour temperature is different, change respectively operating state and the brightness of two groups of White LEDs, can realize the adjusting of two kinds of different-colour mixing ratios, thereby reach the effect that changes brightness and colour temperature.In addition, owing to only needing the two-way pwm signal to control one to one two groups of White LEDs that colour temperature is different, greatly simplify circuit, thereby reduced production cost and failure rate, reduced taking system resource.
Embodiment two
As shown in Figure 2, in order to guarantee that two groups of LED in the LED luminous tube group can be operated in optimum state when the LED conducting, the embodiment of the invention two has been set up two constant flow modules in the LED light fixture: the first constant flow module 80 and the second constant flow module 90, thus realized powering take linear current constant mode as two groups of LED luminous tube groups.
As shown in Figure 2, the first constant flow module 80 is connected with the first light-adjusting module 60, the first constant flow module 80 is used for the current value of the LED in the LED luminous tube group 40 of flowing through being maintained the rated working current value of the LED in the LED luminous tube group 40 when a LED luminous tube group 40 work (being conducting); And, the second constant flow module 90 is connected with the second light-adjusting module 70, the second constant flow module 90 is used for the current value of the LED in the 2nd LED luminous tube group 50 of flowing through being maintained the rated working current value of the LED in the 2nd LED luminous tube group 50 when 50 work (being conducting) of the 2nd LED luminous tube group.
The work characteristics of LED is the mode that needs to adopt constant current-supplying, makes it be operated in the state of best light efficiency and MaLS.The electric current of LED has surpassed the rated current of LED if flow through, and then LED will seriously generate heat, and then can greatly shorten the life-span of LED; And if less than rated current, then can have influence on the luminous light efficiency of LED.The embodiment of the invention is by being two groups of LED constant flow modules of having connected respectively, this constant flow module can be when the conducting of the LED of series connection with it luminous tube group, the current value of LED in this LED luminous tube group of flowing through is maintained the rated working current value of LED, thereby so that LED can be operated in optimum state when conducting, effectively prolong the life-span of LED.
In the specific implementation, constant flow module can adopt current regulator diode (CRD belongs to two ends junction field constant current device, can export constant electric current in very wide voltage range, and have very high motional impedance) to realize.When the LED conducting, current regulator diode guarantees that it is operated in optimum state, can effectively prolong the life-span of LED.The command reception module can be that infrared receiver is first-class, as long as can receive control command, the embodiment of the invention is not done restriction to this.
Embodiment three
Fig. 3 shows the circuit diagram according to first (or second) LED luminous tube group, the first (or second) light-adjusting module and first (or second) constant flow module in the LED light fixture of the embodiment of the invention three.As shown in Figure 3, in the present embodiment three, any one LED luminous tube group among embodiment one and the embodiment two can be comprised of one or more LED of forward series connection, any one light-adjusting module can adopt field effect transistor to realize, any one constant flow module among the embodiment two can adopt current regulator diode to realize, and the constant current value of current regulator diode equates with the rated working current value of LED.
As shown in Figure 3, in a LED luminous tube group or the 2nd LED luminous tube group, a plurality of LED adopt the mode of forward series connection to connect, and wherein, forward series connection refers to that the negative electrode of a LED connects the anode of next LED, by that analogy.The positive pole of the anodic bonding DC power supplier (representing with VCC in Fig. 3) of uppermost LED, the negative electrode of nethermost LED connects the drain electrode of field effect transistor.And the anodic bonding of the source electrode of field effect transistor and current regulator diode, the minus earth of current regulator diode.
Then at this moment, the LED light fixture of the embodiment of the invention three as shown in Figure 4, comprise: VCC (being DC power supplier), the White LED 1 of high color temperature (i.e. a LED luminous tube group), the White LED 2 (i.e. the 2nd LED luminous tube group) of low colour temperature, current regulator diode D3 (i.e. the first constant flow module), D4 (i.e. the second constant flow module), N channel field-effect pipe Q3 (i.e. the first light-adjusting module), Q4 (i.e. the second light-adjusting module), control driver module (not shown) and command reception module (not shown).Wherein, the negative electrode of last LED is connected with the drain electrode of N channel field-effect pipe Q3 (or Q4) among the LED1 (or LED2), and the anode of first LED is connected with the positive pole of DC power supplier (VCC); The anodic bonding of the source electrode of field effect transistor Q3 (or Q4) and current regulator diode D3 (or D4), the minus earth of current regulator diode D3 (or D4) forms one by the series loop of current regulator diode control electric current.
After the command reception module receives control command, the pwm signal that the control driver module has certain duty ratio according to this control command output two-way: the PWM2 (i.e. the second pwm signal) that has the PWM1 (i.e. the first pwm signal) of the first duty ratio and have the second duty ratio.According to different control commands, the duty ratio of two-way pwm signal can identical (namely the first duty ratio equals the second duty ratio), also can different (namely the first duty ratio is not equal to the second duty ratio).The control driver module is exported to PWM1 the grid of field effect transistor Q3, PWM2 is exported to the grid of field effect transistor Q4, controls respectively conducting and the cut-off of these two field effect transistor, and then the turn-on and turn-off of control LED1 and LED2.And pwm signal has certain duty ratio, can control conducting and the deadline of field effect transistor, and then the turn-on and turn-off time (duty ratio of the electric current of the LED that namely flows through) of control LED luminous tube group, has realized the brightness adjustment of LED luminous tube group.By conducting, the deadline that changes respectively LED1 and LED2, can realize the respectively adjustment of the brightness of LED1, LED2.(colour temperature of supposing LED1 is designated as K1 because the colour temperature of LED1 and two groups of luminous tubes of LED2 is different, the colour temperature of LED2 is designated as K2, and K1＞K2), the brightness that changes respectively LED1 and LED2 just can realize changing the effect of colour temperature, that is, the colour temperature of LED light fixture can change between high color temperature K1 and lowest color temperature K2.For example:
(1) luminous as LED1, when LED2 is not luminous, this moment, the colour temperature of LED light fixture was the highest, was K1;
(2) luminous as LED2, when LED1 is not luminous, this moment, the colour temperature of LED light fixture was minimum, was K2;
(3) when the brightness of LED1 and LED2 is identical, this moment, LED light fixture colour temperature was the Neutral colour temp effect.
Particularly, as shown in Figure 4, when PWM1 (or PWM2) is high voltage (concrete magnitude of voltage gets final product more than or equal to the conducting voltage of field effect transistor), field effect transistor Q3 (or Q4) conducting.After Q3 (or Q4) conducting, the resistance between its drain electrode and the source electrode is subjected to the control of the voltage of grid.Because the conducting of Q3 (or Q4), current regulator diode D3 (or D4) work, guarantee to flow through the current value (be the constant current value of D3 (or D4), also be the rated working current value of LED) of value for setting of the electric current of current regulator diode D3 (or D4).(leak, source electrode) (or Q4 (leak, source electrode)) and current regulator diode D3 (or D4) be for being connected in series because light-emitting diode group LED1 (or LED2), field effect transistor Q3, so it is also consistent with the current value of above-mentioned setting to flow through the value of electric current of light-emitting diode group LED1 (or LED2).
Otherwise, when PWM1 (or PWM2) is low-voltage (concrete magnitude of voltage gets final product less than the conducting voltage of field effect transistor), field effect transistor Q3 (or Q4) enters cut-off state, and then this moment, LED 1 (or LED2) ends (not luminous).
As from the foregoing, when PWM1 (or PWM2) is high voltage, LED1 (or LED2) conducting (namely luminous), and when being low-voltage, LED1 (or LED2) ends (namely not luminous).Therefore, can come to control one to one respectively by the PWM1 with first duty ratio and the PWM2 with second duty ratio the operating state of LED1 and LED2, and, because the conducting of LED and the ratio of deadline (or duty ratio of LED electric current) can determine the brightness of LED, therefore, the duty ratio of PWM1 (or PWM2) also can determine the brightness of LED1 (or LED2).Therefore, come to control one to one respectively the duty ratio of the electric current of LED1 and LED2 by PWM1 and PWM2, can control respectively operating state and the brightness of LED1 and LED2, realize the adjusting of two kinds of different-colour mixing ratios, thereby reach the effect that changes brightness and colour temperature.For example: when the duty ratio of PWM1 equated (namely the first duty ratio equals the second duty ratio) with the duty ratio of PWM2, the brightness of LED1 and LED2 was identical, and this moment, LED light fixture colour temperature was the Neutral colour temp effect; The duty ratio of PWM1 be during than large must more the manying of duty ratio of PWM2, LED1 than LED2 is bright must be more many, this moment, the colour temperature of LED light fixture was higher, on the contrary, the colour temperature of LED light fixture is lower.
Embodiment four
As shown in Figure 5, the present embodiment four has increased the voltage stabilizing circuit and the NPN triode (Q1 and Q2) that are comprised of resistance (R1 and R2) and voltage stabilizing didoe (D1 and D2) on the circuit base of above-described embodiment three.Then at this moment, as shown in Figure 5, the LED light fixture comprises: VCC (being DC power supplier), the White LED 1 of high color temperature (i.e. a LED luminous tube group), the White LED 2 (i.e. the 2nd LED luminous tube group) of low colour temperature, current regulator diode D3 (i.e. the first constant flow module), D4 (i.e. the second constant flow module), insulated-gate type N channel field-effect pipe Q3, resistance R 1, the first light-adjusting module that voltage stabilizing didoe D1 and NPN triode Q1 form, insulated-gate type N channel field-effect pipe Q4, resistance R 2, the second light-adjusting module that voltage stabilizing didoe D2 and NPN triode Q2 form, control driver module (not shown) and command reception module (not shown).Wherein, the voltage stabilizing value of voltage stabilizing didoe D1, D2 is 6～10V; D3, D4 are large electric current current regulator diode, and constant current value is identical with the rated operational current of LED; Resistance R 1=R2=VCC/10000.
As shown in Figure 5, the negative electrode of last LED is connected with the drain electrode of N channel field-effect pipe Q3 (or Q4) among the LED1 (or LED2), and the anode of first LED is connected with the positive pole of DC power supplier (VCC); The anodic bonding of the source electrode of field effect transistor Q3 (or Q4) and current regulator diode D3 (or D4), the minus earth of current regulator diode D3 (or D4) forms one by the series loop of current regulator diode control electric current.PWM1 (i.e. the first pwm signal) and PWM2 (i.e. the second pwm signal) are the two-way pwm signal of drive control module output, output to respectively the base stage of Q1, two triodes of Q2; D1 and R1 form voltage stabilizing circuit, and the grid for Q3 when Q1 ends provides a constant voltage; D2 and R2 form voltage stabilizing circuit, and the grid for Q4 when Q2 ends provides a constant voltage; The emitter of Q1 links to each other with the grid of Q3, control Q3 conducting and cut-off; The emitter of Q2 links to each other with the grid of Q4, control Q4 conducting and cut-off.
Then, after the command reception module receives control command, the pwm signal that the control driver module has certain duty ratio according to control command output two-way: have the PWM1 of the first duty ratio and the PWM2 with second duty ratio, according to different control commands, the duty ratio of two-way pwm signal can identical (namely the first duty ratio equals the second duty ratio), also can different (namely the first duty ratio is not equal to the second duty ratio).The control driver module is exported to PWM1 the base stage of NPN triode Q1, PWM2 is exported to the base stage of NPN triode Q2, by conducting and the cut-off of controlling respectively these two NPN triodes, come to control one to one respectively conducting and the cut-off of two field effect transistor, and then the turn-on and turn-off of control LED1 and LED2.And pwm signal has certain duty ratio, can control conducting and the deadline of field effect transistor, and then the turn-on and turn-off time of control LED luminous tube group, has realized the brightness adjustment of LED luminous tube group.By conducting, the deadline that changes respectively LED1 and LED2, can realize the respectively adjustment of the brightness of LED1, LED2.(colour temperature of supposing LED1 is designated as K1 because the colour temperature of LED1 and two groups of luminous tubes of LED2 is different, the colour temperature of LED2 is designated as K2, and K1＞K2), the brightness that changes respectively LED1 and LED2 just can realize changing the effect of colour temperature, that is, the colour temperature of LED light fixture can change between high color temperature K1 and lowest color temperature K2.For example:
(1) luminous as LED1, when LED2 is not luminous, this moment, the colour temperature of LED light fixture was the highest, was K1;
(2) luminous as LED2, when LED1 is not luminous, this moment, the colour temperature of LED light fixture was minimum, was K2;
(3) when the brightness of LED1 and LED2 is identical, this moment, LED light fixture colour temperature was the Neutral colour temp effect.
Particularly, as shown in Figure 5, when PWM1 (or PWM2) is that (concrete magnitude of voltage gets final product less than the conducting voltage of NPN triode low level, for example be 0) time, Q1 (or Q2) cut-off, the grid of Q3 (or Q4) is subjected to voltage stabilizing didoe D1 (or D2) control, and its voltage is high level, Q3 (or Q4) conducting.After Q3 (or Q4) conducting, the resistance between its drain electrode and the source electrode is subjected to the control of grid voltage.Because the conducting of Q3 (or Q4), current regulator diode D3 (or D4) work is guaranteed to flow through the electric current of current regulator diode D3 (or D4) and is the electric current of setting.Because belonging to field effect transistor Q3 (leakage, source electrode) (or Q4 (leakage, source electrode)) and current regulator diode D3 (or D4), light-emitting diode group LED1 (or LED2) is connected in series, so it is also consistent with the electric current of setting to flow through the electric current of light-emitting diode group LED1 (or LED2).
If the power consumption of current regulator diode D3 (or D4) strengthens, then the voltage at current regulator diode D3 (or D4) two ends can increase.Because the grid voltage of Q3 (or Q4) is controlled by voltage stabilizing didoe D1 (or D2); remain on a constant voltage; the increase of the voltage at current regulator diode D3 (or D4) two ends can reduce the voltage between Q3 (or Q4) grid and the source electrode; resistance between its drain electrode and the source electrode is increased, play the effect of protection current regulator diode D3 (or D4).
Otherwise, when PWM1 (or PWM2) is high level (concrete magnitude of voltage only needs to get final product more than or equal to the conducting voltage of NPN triode, for example greater than 0.7V), Q1 (or Q2) conducting, the grid of Q3 (or Q4) is low level, and Q3 (or Q4) enters cut-off state.Light-emitting diode group LED1 this moment (or LED2) cut-off (not luminous).
As from the foregoing, when PWM1 (or PWM2) was high voltage, LED1 (or LED2) ended (namely not luminous), and when being low-voltage, LED1 (or LED2) conducting (namely luminous).Therefore, can come to control one to one respectively by the PWM1 with first duty ratio and the PWM2 with second duty ratio the operating state of LED1 and LED2, and, because the conducting of LED and deadline (or duty ratio of LED electric current) can determine the brightness of LED, therefore, the duty ratio of PWM1 (or PWM2) also can determine the brightness of LED1 (or LED2).Therefore, come to control one to one respectively the duty ratio of the electric current of LED1 and LED2 by PWM1 and PWM2, can control respectively operating state and the brightness of LED1 and LED2, realize the adjusting of two kinds of different-colour mixing ratios, thereby reach the effect that changes brightness and colour temperature.For example: when the duty ratio of PWM1 equated (namely the first duty ratio equals the second duty ratio) with the duty ratio of PWM2, the brightness of LED1 and LED2 was identical, and this moment, LED light fixture colour temperature was the Neutral colour temp effect; The duty ratio of PWM2 be during than large must more the manying of duty ratio of PWM1, LED1 than LED2 is bright must be more many, this moment, the colour temperature of LED light fixture was higher, on the contrary, the colour temperature of LED light fixture is lower.
Obviously, the first light-adjusting module among above-described embodiment three and the embodiment four and the physical circuit of the second light-adjusting module can combination in any.That is to say, when reality was implemented, the first light-adjusting module comprised: field effect transistor Q3, and the second light-adjusting module comprises: field effect transistor Q4, resistance R 2, voltage stabilizing didoe D2 and NPN triode Q2; Perhaps, the first light-adjusting module comprises: field effect transistor Q3, resistance R 1, voltage stabilizing didoe D1 and NPN triode Q1, and the second light-adjusting module comprises: field effect transistor Q4.
In above-described embodiment three and embodiment four, the quantity of the LED that each LED luminous tube group comprises can be according to the actual requirements and the output voltage of DC power supply determine.Particularly, when the output voltage V c of DC power supplier determines, can come to determine by the output voltage V c of DC power supplier according to following formula (1) the quantity N of LED in the LED luminous tube group:
Max{LED quantity }=(Vc-V1)/V2 (1)
Wherein, max{LED quantity } the quantity maximum of LED in the expression LED luminous tube group, Vc is the output voltage of DC power supplier, and V1 represents the conducting voltage of current regulator diode, and V2 is the conducting voltage of LED.Like this, the LED actual quantity N in each LED luminous tube group is less than or equal to max{LED quantity } get final product.When the LED actual quantity N in each LED luminous tube group equals max{LED quantity } time, most effective; When the LED actual quantity N in each LED luminous tube group less than max{LED quantity the time, can increase the power consumption of field effect transistor, reduce energy-saving efficiency; When the LED actual quantity N in each LED luminous tube group greater than max{LED quantity the time, can make fully conducting of luminous tube, reduce luminous efficiency.
Equally, when the quantity N of the LED in LED luminous tube group determines, also can come to determine by the quantity N of LED in the LED luminous tube group according to following formula (2) the output voltage V c of DC power supplier:
Vc＝N×V2+V1 (2)
Wherein, N represents the actual quantity of the LED in the LED luminous tube group, and Vc is the output voltage of DC power supplier, and V1 represents the conducting voltage of current regulator diode, and V2 is the conducting voltage of LED.
When reality is implemented, the control driver module can use respectively the DC power supply of different voltages to power independently from two LED luminous tube groups, at this moment, can comprise two DC power supply with different output voltages in the DC power supplier, one of them is the power supply of control driver module, and another is two LED luminous tube group power supplies; Perhaps, DC power supplier also can be a DC power supply, and it can export two kinds of different voltages, is respectively control driver module and two LED luminous tube group power supplies.In addition, when the quantity of the LED in the LED luminous tube group is more, can adopt higher power voltage supply to LED luminous tube group.
In addition, in above-described embodiment one to embodiment four, as long as a LED luminous tube group is different with the colour temperature of the 2nd LED luminous tube group, but in actual applications, the gap of both colour temperatures can differ largerly, color temperature difference is apart from larger, the colour temperature adjustable range of LED light fixture is larger, and the colour temperature of that group that colour temperature is higher in two LED luminous tube groups is higher, the colour temperature of that group that colour temperature is lower is lower, and the colour temperature regulating effect of LED light fixture is better.
The LED light fixture that the brightness of the above embodiment of the present invention and colour temperature are adjustable can be widely used in normal lighting and ambient lighting.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
(1) two kinds of White LED luminous tube groups that colour temperature is different have been adopted, and use the two-way pwm signal to control one to one respectively operating state and the brightness of the LED of these two groups of different-colours, because colour temperature is different, change respectively operating state and the brightness of two groups of White LEDs, can realize the adjusting of two kinds of different-colour mixing ratios, thereby reach the effect that changes brightness and colour temperature;
(2) owing to only needing the two-way pwm signal to control one to one two groups of White LEDs that colour temperature is different, greatly simplify circuit, thereby reduced production cost and failure rate, reduced taking system resource;
(3) by being two groups of LED constant flow modules of having connected respectively, this constant flow module can be when the conducting of the LED of series connection with it luminous tube group, the current value of LED in this LED luminous tube group of flowing through is maintained the rated working current value of LED, thereby so that LED can be operated in optimum state when conducting, effectively prolong the life-span of LED.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a brightness and the adjustable light-emitting diode (LED) lamp of colour temperature is characterized in that,
Comprise:
DC power supplier;
The command reception module is used for receiving control command;
The control driver module for the control command that receives according to described command reception module, is exported the first pulse width modulation (PWM) signal and the second pwm signal;
The LED luminous tube group that colour temperature is different and the 2nd LED luminous tube group, the LED in a described LED luminous tube group and the 2nd LED luminous tube group is white light LEDs, and the colour temperature of the LED in the same LED luminous tube group is identical;
The first light-adjusting module is used for controlling according to described the first pwm signal operating state and the brightness of a described LED luminous tube group; And
The second light-adjusting module is used for controlling according to described the second pwm signal operating state and the brightness of described the 2nd LED luminous tube group.
2. LED light fixture according to claim 1 is characterized in that, also comprises:
The first constant flow module is used for the current value of the LED in the described LED luminous tube group being maintained the rated working current value of LED when described LED luminous tube group work; And
The second constant flow module is used for the current value of the LED in described the 2nd LED luminous tube group being maintained the rated working current value of LED when described the 2nd LED luminous tube group work.
3. LED light fixture according to claim 2 is characterized in that,
Described the first constant flow module is current regulator diode D3, the anode of described current regulator diode D3 is connected with described the first light-adjusting module, minus earth, and the rated working current value of the LED in the constant current value of described current regulator diode D3 and the described LED luminous tube group equates; And
Described the second constant flow module is current regulator diode D4, the anode of described current regulator diode D4 is connected with described the second light-adjusting module, minus earth, and the rated working current value of the LED in the constant current value of described current regulator diode D4 and described the 2nd LED luminous tube group equates.
4. each described LED light fixture in 3 according to claim 1, it is characterized in that, each LED luminous tube group in a described LED luminous tube group and described the 2nd LED luminous tube group includes forward at least one LED of series connection, and, the anode of the LED of an end is connected with the positive pole of described DC power supplier in described each LED luminous tube group, and the negative electrode of the LED of the other end connects with corresponding light-adjusting module.
5. LED light fixture according to claim 3, it is characterized in that, described the first light-adjusting module is N channel field-effect pipe Q3, the anodic bonding of the source electrode of described field effect transistor Q3 and described current regulator diode D3, drain electrode is connected with a described LED luminous tube group, and grid is connected, is used for receiving described the first pwm signal with described control driver module.
6. LED light fixture according to claim 5, it is characterized in that, described the second light-adjusting module is N channel field-effect pipe Q4, the anodic bonding of the source electrode of described field effect transistor Q4 and described current regulator diode D4, drain electrode is connected with described the 2nd LED luminous tube group, and grid is connected, is used for receiving described the second pwm signal with described control driver module.
7. LED light fixture according to claim 6 is characterized in that, includes in described the first light-adjusting module: N channel field-effect pipe Q3, resistance R 1, voltage stabilizing didoe D1 and NPN triode Q1; Wherein:
The source electrode of described N channel field-effect pipe Q3 and the anodic bonding of described current regulator diode D3, drain electrode is connected with a described LED luminous tube group, the negative electrode of grid and described voltage stabilizing didoe D1 be connected the emitter of NPN triode Q1 and be connected;
The plus earth of described voltage stabilizing didoe D1;
One end of described resistance R 1 is connected with the positive pole of described DC power supplier, the emitter of the other end and described NPN triode Q1 be connected the negative electrode of voltage stabilizing didoe D1 and be connected;
The base stage of described NPN triode Q1 is connected, is used for receiving described the first pwm signal, grounded collector with described control driver module.
8. according to claim 5 or 7 described LED light fixtures, it is characterized in that, include in described the second light-adjusting module: N channel field-effect pipe Q4, resistance R 2, voltage stabilizing didoe D2 and NPN triode Q2; Wherein:
The source electrode of described N channel field-effect pipe Q4 and the anodic bonding of described current regulator diode D4, drain electrode is connected with described the 2nd LED luminous tube group, the negative electrode of grid and described voltage stabilizing didoe D2 be connected the emitter of NPN triode Q2 and be connected;
The plus earth of described voltage stabilizing didoe D2;
One end of described resistance R 2 is connected with the positive pole of described DC power supplier, the emitter of the other end and described NPN triode Q2 be connected the negative electrode of voltage stabilizing didoe D2 and be connected;
The base stage of described NPN triode Q2 is connected, is used for receiving described the second pwm signal, grounded collector with described control driver module.
9. according to claim 1-3, each described LED light fixture among the 5-7, it is characterized in that, described control driver module is single-chip microcomputer, described single-chip microcomputer is for the control command that receives according to described command reception module, and output has the first pwm signal of the first duty ratio and the second pwm signal with second duty ratio.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102203219A CN102917486A (en) | 2011-08-02 | 2011-08-02 | LED lamp adjustable in luminance and color temperature |
| PCT/CN2012/078514 WO2013017010A1 (en) | 2011-08-02 | 2012-07-11 | Brightness and color temperature adjustable led lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102203219A CN102917486A (en) | 2011-08-02 | 2011-08-02 | LED lamp adjustable in luminance and color temperature |
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| CN102917486A true CN102917486A (en) | 2013-02-06 |
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| CN2011102203219A Pending CN102917486A (en) | 2011-08-02 | 2011-08-02 | LED lamp adjustable in luminance and color temperature |
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| WO (1) | WO2013017010A1 (en) |
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