CN110087365B - Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip - Google Patents
Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip Download PDFInfo
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- CN110087365B CN110087365B CN201910441203.7A CN201910441203A CN110087365B CN 110087365 B CN110087365 B CN 110087365B CN 201910441203 A CN201910441203 A CN 201910441203A CN 110087365 B CN110087365 B CN 110087365B
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- 239000000758 substrate Substances 0.000 claims abstract description 23
- 230000000712 assembly Effects 0.000 claims abstract description 11
- 238000000429 assembly Methods 0.000 claims abstract description 11
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000004075 alteration Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
Classifications
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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]
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a soft LED light bar circuit and a soft light bar for synchronously adjusting brightness and color temperature, wherein the circuit comprises: positive bus bar (26), negative bus bar (27) and a plurality of LED luminous subassembly (22), each LED luminous subassembly includes: the LED lamp comprises a first LED lamp string (23) and a second LED lamp string (24) which are connected in parallel, a voltage control type semiconductor switch tube (5) connected in the second LED lamp string, and a delay circuit (25) connected at the control end of the switch tube, wherein the quantity of LEDs in the two LED lamp strings is the same and the color temperature values are different. The soft light bar comprises a strip-shaped substrate and the soft light bar circuit, wherein a positive bus and a negative bus are respectively arranged on the back surface of the substrate along the length direction of the substrate, and a plurality of LED light-emitting assemblies are arranged on the front surface of the substrate along the length direction of the substrate. The power supply of the circuit is easy to match, chromatic aberration is not generated due to the increase of the length of the lamp strip, and the consistency of color temperature adjustment is good.
Description
Technical Field
The invention relates to the field of LED illumination, in particular to a circuit for synchronously adjusting brightness and color temperature of an LED soft lamp strip and a soft lamp strip adopting the circuit.
Background
Traditional soft lamp strip of adjustable luminance and colour temperature adopts the mode that two way different colour temperature LED circuits adjusted respectively, and circuit structure needs three power input line, and such circuit needs to be equipped with special adjustable luminance and the controller of adjusting the colour temperature, and adjusts luminance and the temperature of mixing of colors and need separate the regulation, neither convenient installation or repacking, adjusts also inconvenient.
For this purpose, improvements have been proposed. Specifically, the number of LEDs in two LED circuits with different color temperatures is set to be different, so as to form an unbalanced structure, as shown in fig. 1, when the external dimmable LED driving power supply 11 is in a high-brightness output state, the output voltage is high, the current is large, the driving currents of the first color temperature LED circuit 12 and the second color temperature LED circuit 13 are equivalent, and the mixed color temperature is higher; when the external dimmable LED driving power supply 11 is in a low-brightness output state, the output voltage is lower, the driving current drop amplitude on the first color temperature LED circuit 12 is far greater than that on the second color temperature LED circuit 13, the proportion of low color temperature in mixed light emitted by the LED light bar is increased, the total color temperature of the mixed light is reduced, and the purpose of dimming and adjusting the color temperature is achieved. Therefore, as long as two power input lines are provided, a special controller for adjusting light and color temperature is not needed, and the function of adjusting light and color temperature can be realized by connecting the circuit with only the light adjusting function. However, such circuits also have some drawbacks: 1. the voltage regulation mode is adopted, but the voltage regulation type LED dimming power supply is eliminated in the market, so that the power supply of the matched soft light bar is difficult to find by a user side. 2. The color temperature change is directly related to the voltage, and when the cascade length of the soft light bar is longer, the color difference, namely the color difference, can occur due to inconsistent voltages before and after the soft light bar.
Disclosure of Invention
The invention aims to provide a circuit for synchronously adjusting the brightness and the color temperature of an LED soft light bar so as to solve the defects in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides a soft lamp strip circuit of luminance colour temperature synchronous regulation LED can adapt external constant voltage PWM output dimming power supply (21), soft lamp strip circuit of LED includes:
A positive electrode bus bar (26);
A negative electrode bus bar (27); and
A plurality of LED lighting assemblies (22), each of the LED lighting assemblies comprising:
the first LED lamp string (23) is formed by connecting a first current limiting resistor (2) and a plurality of first LEDs (1) in series, one end of the first LED lamp string is connected with the positive bus, and the other end of the first LED lamp string is connected with the negative bus;
the second LED lamp string (24) is formed by connecting a second current limiting resistor (4) and a plurality of second LEDs (3) in series, the second LED lamp string (24) is connected with the first LED lamp string (23) in parallel, and the second LEDs (3) and the first LEDs (1) are the same in number and different in color temperature value;
A voltage-controlled semiconductor switching tube (5) connected to the second LED string (24); and
The delay circuit (25) comprises a capacitor (6), a charging resistor (7) and a discharging resistor (8), wherein the capacitor and the discharging resistor are connected in parallel and then connected between the control end of the switching tube and the negative bus, and the charging resistor is connected between the control end of the switching tube and the positive bus in a bridging manner.
The driving current I WW of the first LED string follows the power voltage V DD, and the driving current I CW of the second LED string generates a delay time t A compared to the driving current I WW due to the switching tube and the delay circuit. In this way, when the LED light-emitting module is used, the positive bus and the negative bus are connected with the external constant-voltage PWM output dimming power supply, the brightness of the LED light-emitting module can be adjusted by controlling the duty ratio of the PWM waveform of the power supply voltage V DD, and the proportion t CW.ON/tON of the high-level duration t CW.ON of the driving current I CW to the high-level duration t ON of the driving current I WW is changed when the duty ratio of the PWM waveform is changed due to the delay time t A, so that the overall color temperature of mixed light emitted by the LED light-emitting module is changed, and the aim of adjusting the brightness and the color temperature Zhou Bu is fulfilled.
In the above scheme, the number of LEDs in two LED lamp strings is the same, synchronous adjustment of brightness and color temperature is realized by adjusting the duty ratio of PWM waveform, the power supply voltage VDD is kept constant, no color difference is generated after the length of the soft lamp strip is increased, and the length of the stage be reappointed or reelected consecutively can be theoretically calculated within the allowable range of the dimming power supply power without causing the color difference.
In the scheme, the voltage control type semiconductor switching tube is adopted, and the switching tube cannot cause deviation of delay time t A, so that consistency of color temperature adjustment is good, and product qualification rate is high.
In the above circuit for synchronously adjusting brightness and color temperature of the soft LED light bar, preferably, the voltage-controlled switching tube is a MOS tube.
The invention also provides an LED soft light bar for synchronously adjusting the brightness and the color temperature, which comprises: a band-shaped substrate; the LED soft light bar circuit; the positive electrode bus and the negative electrode bus are respectively arranged on the back surface of the substrate along the length direction of the substrate, and the LED light-emitting assemblies are arranged on the front surface of the substrate along the length direction of the substrate.
In the above-mentioned soft LED light bar with synchronously adjustable brightness and color temperature, preferably, the voltage-controlled switching tube is a MOS tube.
In the above-mentioned soft LED light bar for synchronously adjusting brightness and color temperature, preferably, a mark is provided on a surface of the substrate between adjacent LED light emitting assemblies.
In the above soft LED light bar with synchronous adjustment of brightness and color temperature, preferably, the positive bus and the negative bus are strip-shaped metal foils, and after the light bar is cut along the mark, the positive bus and the negative bus form a contact electrode at the cutting position for connecting with an external constant-voltage PWM output dimming power supply.
Compared with the prior art, the invention has at least the following beneficial effects:
As long as two input power lines, the synchronous adjustment effect of brightness and color temperature can be realized by only matching with a constant-voltage PWM output dimming power supply commonly used in the market, and the length of the stage be reappointed or reelected consecutively can be ensured within the allowable range of the dimming power supply power without causing chromatic aberration. Meanwhile, the consistency of color temperature adjustment is good, and the product percent of pass is high.
Drawings
FIG. 1 is a circuit diagram of a prior art LED soft light bar with adjustable light and color temperature;
FIG. 2 is a circuit diagram of an LED soft light bar of the present invention;
Fig. 3 is a waveform of the working voltage V DD of the corresponding soft light bar, a waveform of the driving current I WW of the first LED light string and a waveform of the driving current I CW of the second LED light string when the external constant voltage PWM output dimming power supply outputs at different dimming rates;
Reference numerals: 1. a first LED; 2. a first current limiting resistor; 3. a second LED; 4. a second current limiting resistor; 5. a voltage-controlled semiconductor switching tube; 6. a capacitor; 7. a charging resistor; 8. a discharge resistor; 11. an external dimmable LED driving power supply; 12. a first color temperature LED circuit; 13. a second color temperature LED circuit; 21. an external constant-voltage PWM output dimming power supply; 22. an LED light emitting assembly; 23. a first LED light string; 24. a second LED string light; 25. a delay circuit; 26. a positive electrode bus; 27. and a negative electrode bus.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 2, the present circuit for synchronously adjusting luminance and color temperature of an LED soft light bar includes: positive bus bar 26, negative bus bar 27, and several LED lighting assemblies 22.
Each LED lighting assembly 22 includes: the LED lamp comprises a first LED lamp string 23, a second LED lamp string 24, a voltage control type semiconductor switch tube 5 and a delay circuit 25.
The first LED lamp string 23 is formed by connecting a first current limiting resistor 2 and a plurality of first LEDs 1 in series and is in a strip shape, one end of the first LED lamp string 23 is connected with a positive bus 26, and the other end of the first LED lamp string is connected with a negative bus 27.
The second LED light string 24 is formed by connecting a second current limiting resistor 4 and a plurality of second LEDs 3 in series, and is in a strip shape, the second LED light string 24 is connected with the first LED light string 23 in parallel, the number of the second LEDs 3 is the same as the number of the first LEDs 1, and the color temperature value of the second LEDs 3 is different from the color temperature value of the first LEDs 1. In particular, in the present embodiment, the color temperature value of the first LED1 is smaller than that of the second LED3, but the present invention may be designed in the opposite manner.
The voltage-controlled semiconductor switching tube 5 is connected to the second LED string 24, and the voltage-controlled semiconductor switching tube 5 is preferably a MOS tube.
The delay circuit 25 comprises a capacitor 6, a charging resistor 7 and a discharging resistor 8, wherein the capacitor 6 and the discharging resistor 8 are connected in parallel and then connected between the control end of the switching tube 5 and the negative bus 27, and the charging resistor 7 is connected between the control end of the switching tube 5 and the positive bus 26 in a bridging manner.
As shown in fig. 3, the external constant voltage PWM output dimming power supply 21 outputs a PWM waveform with a voltage of period t PWM, and the dimming ratio is similar to the duty ratio t D of the waveform. When the output dimming rate of the external constant-voltage PWM output dimming power supply 21 is 100%, the duty ratio t D of the output PWM voltage is 100%, the soft light bar working voltage V DD is continuously output, the driving current I WW of the first LED light string 23 and the driving current I CW of the second LED light string 24 are both in continuous maximum states, and the two color temperatures are kept in a fixed proportion, and the soft light bar presents the highest brightness and the color temperature is the mixed color temperature of the first LED light string 23 and the second LED light string 24. Period t PWM may be any number between 0.0025 milliseconds and 10 milliseconds.
As shown in fig. 2, the minimum value of the driving current I WW of the first LED string 23 is 0, and the maximum value I WW.max is a constant determined by the lamp bar operating voltage V DD, the sum of the forward voltages of all the first LEDs 1, and the resistance value of the first current limiting resistor 2; the minimum value of the driving current I CW of the second LED string 24 is 0, and the maximum value I CW.max is a constant determined by the lamp bar working voltage VDD, the sum of the forward voltages of all the second LEDs 3, the resistance value of the second current limiting resistor 4, and the voltage drop between the drain and the source of the MOS transistor (the switching transistor 5).
As shown in fig. 3, when the output dimming rate of the external constant-voltage PWM output dimming power supply 21 is reduced, the duty cycle t D of the soft light bar operating voltage V DD is also reduced, the soft light bar operating voltage V DD is a PWM waveform with a high-low voltage variation, and the duty cycle t D is less than 100%. At this time, waveforms of the driving current I WW of the first LED string 23 and the driving current I CW of the second LED string 24 are different.
As shown in fig. 2, since the first LED string 23 is directly connected to the power supply through the first current limiting resistor 2, the driving current I WW of the first LED string 23 should follow the power supply voltage V DD, and the waveform thereof is as shown in fig. 3, and the duration of I WW.max is t ON in any period t PWM.
As shown in fig. 2, since the operation of the second LED string light 24 is controlled by the MOS transistor (the switch transistor 5), when the soft light bar operating voltage V DD is changed from low level to high level, the capacitor 6 is connected between the gate G and the source S of the MOS transistor, and the capacitor 6 is fully discharged by the discharge resistor 8 when the soft light bar operating voltage V DD is in the low level stage. Therefore, the grid voltage U GS cannot be suddenly changed, U GS is smaller than the starting voltage U T of the MOS tube, the MOS tube is in a cut-off state, and the driving current I CW of the second LED lamp string 24 still keeps in a0 state; when the power supply is required to charge the capacitor 6 to u GS≥UT through the charging resistor 7, the MOS tube is conducted, and the driving current I CW of the second LED lamp string 24 begins to change along with the power supply voltage V DD; at this time, the driving current I CW of the second LED string 24 generates a fixed delay time with respect to the driving current I WW of the first LED string 23, as shown by t A in fig. 3. Thus, the duration of I CW.max within any period t PWM is t CW.ON＝tON-tA.
As is known from the LED lighting principle and PWM dimming principle, the lighting brightness of the first LED string 23 and the second LED string 24 is in direct proportion to the respective driving currents and the on time in the period. Since the maximum values I WW.max and I CW.max of the driving currents of the two color temperature light strings are constant, the ratio of the light emission luminance of the second LED light string 24 to the light emission luminance of the first LED light string 23 is determined by t CW.ON/tON in one PWM pulse period t PWM, and then t CW.ON/tON＝(1-tA/tON)(tON≥tA. Therefore, when the dimming ratio is reduced, the brightness is reduced, t ON is also reduced, t CW.ON/tON is reduced, the low color temperature ratio of the two color temperatures of the soft light bar is increased, and the total color temperature of the mixed light emitted by the soft light bar is reduced. Thereby achieving the purpose of adjusting the brightness and the color temperature Zhou Bu.
As shown in fig. 2, the brightness of the second LED string 24 and the brightness of the first LED string 23 are adjusted to have opposite color temperature change effects.
As shown in fig. 2, changing the parameters of the charging resistor 7 and the capacitor 6 will change the delay time generated by the driving current I CW of the second LED string 24 relative to the driving current I WW of the first LED string 23, as shown by t A in fig. 3; thereby changing the slope of the color temperature following the brightness change. The delay time t A may be any value between 0.001 milliseconds and 5 milliseconds.
The LED light-emitting component is formed by connecting two LED lamp strings with different color temperatures in parallel, and the two LED lamp strings with different color temperatures have the same LED quantity. One path of LED lamp string directly emits light through the current limiting resistor, and the other path of LED lamp string emits light under the control of the MOS tube. The on time of the MOS tube is controlled, so that the ratio of the light emitting time of the low-color-temperature LED lamp string to the light emitting time of the high-color-temperature LED lamp string is changed under the condition of different dimming rates, the effect that the color temperature is changed while dimming is achieved, and the aim of synchronously adjusting the brightness and the color temperature is fulfilled.
Therefore, as long as two input power lines are used, the brightness and color temperature synchronous adjustment effect can be realized only by matching with a constant-voltage PWM output dimming power supply commonly used in the market, and the length of the stage be reappointed or reelected consecutively can be ensured within the allowable range of the dimming power supply power without causing chromatic aberration.
Because the voltage control type semiconductor switch tube is adopted, when the capacitor 6 is charged, the charging current is not shunted by the switch tube, and the deviation of the delay time t A is not caused, so that the consistency of color temperature adjustment is good, and the product qualification rate is high.
All parts of the invention can find the ready-made miniature packaging size, can be conveniently arranged on the flexible PCB, and have practical value.
The soft light bar of the LED soft light bar circuit structure comprises a strip-shaped substrate, wherein the positive electrode bus and the negative electrode bus are respectively arranged on the back surface of the substrate along the length direction of the substrate, and a plurality of LED luminous assemblies are arranged on the front surface of the substrate along the length direction of the substrate.
Further, marks may be provided on the surface of the substrate between adjacent LED light emitting modules. Thus, people can conveniently find the head and the tail of the LED luminous component and can cut rapidly.
The positive bus and the negative bus are strip-shaped metal foils, after the lamp strip is cut along the mark, the positive bus and the negative bus form a contact electrode at the cutting position, and after the cutting end is spliced with a power output master socket of an external constant-voltage PWM output dimming power supply, the contact electrode is contacted with an electrode in the power output master socket to realize electric connection. Therefore, the soft light bar can be used after being cut, and a plug is not required to be installed.
The foregoing detailed description of the invention has been provided by way of example only to assist those skilled in the art in understanding the invention and is not to be construed as limiting the scope of the invention. Various modifications, equivalent changes, etc. which are made by those skilled in the art to the above-described embodiments under the inventive concept should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a soft lamp strip circuit of luminance colour temperature synchronous regulation LED can adapt external constant voltage PWM output dimming power supply (21), its characterized in that, soft lamp strip circuit of LED includes:
A positive electrode bus bar (26);
A negative electrode bus bar (27); and
A plurality of LED lighting assemblies (22), each of the LED lighting assemblies comprising:
the first LED lamp string (23) is formed by connecting a first current limiting resistor (2) and a plurality of first LEDs (1) in series, one end of the first LED lamp string is connected with the positive bus, and the other end of the first LED lamp string is connected with the negative bus;
the second LED lamp string (24) is formed by connecting a second current limiting resistor (4) and a plurality of second LEDs (3) in series, the second LED lamp string (24) is connected with the first LED lamp string (23) in parallel, and the second LEDs (3) and the first LEDs (1) are the same in number and different in color temperature value;
A voltage-controlled semiconductor switching tube (5) connected to the second LED string (24); and
The delay circuit (25) comprises a capacitor (6), a charging resistor (7) and a discharging resistor (8), wherein the capacitor and the discharging resistor are connected in parallel and then connected between the control end of the switching tube and the negative bus, and the charging resistor is connected between the control end of the switching tube and the positive bus in a bridging manner.
2. The soft light bar circuit of claim 1, wherein the switching tube is a MOS tube.
3. The utility model provides a soft lamp strip of luminance colour temperature synchronous adjustment LED which characterized in that, soft lamp strip of LED includes:
A band-shaped substrate; and
The LED soft light bar circuit of claim 1;
The positive electrode bus and the negative electrode bus are respectively arranged on the back surface of the substrate along the length direction of the substrate, and the LED light-emitting assemblies are arranged on the front surface of the substrate along the length direction of the substrate.
4. The soft LED light bar of claim 3, wherein the switching tube is a MOS tube.
5. The luminance and color temperature synchronization adjustment LED soft light bar of claim 3, wherein the surface of the substrate is provided with a mark between adjacent LED light emitting assemblies.
6. The soft LED strip of claim 5, wherein the positive and negative bus bars are strip-shaped metal foils, and after the strip is cut along the mark, the positive and negative bus bars form contact electrodes at the cut positions for connection with an external constant voltage PWM output dimming power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910441203.7A CN110087365B (en) | 2019-05-24 | 2019-05-24 | Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip |
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| CN201910441203.7A CN110087365B (en) | 2019-05-24 | 2019-05-24 | Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip |
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| CN110087365B true CN110087365B (en) | 2024-05-24 |
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| CN110913525B (en) * | 2019-12-11 | 2022-06-28 | 国网北京市电力公司 | Double-bus lighting circuit with adjustable color temperature |
| CN117998703A (en) * | 2024-04-03 | 2024-05-07 | 深圳莱福德科技股份有限公司 | LED driving power supply control expansion system and method |
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