CN210183599U - Brightness and color temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip - Google Patents
Brightness and color temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip Download PDFInfo
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- CN210183599U CN210183599U CN201920766667.0U CN201920766667U CN210183599U CN 210183599 U CN210183599 U CN 210183599U CN 201920766667 U CN201920766667 U CN 201920766667U CN 210183599 U CN210183599 U CN 210183599U
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- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 12
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Abstract
The utility model discloses a luminance colour temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip, this circuit includes: positive bus bar (26), negative bus bar (27) and a plurality of LED light emitting components (22), each LED light emitting component 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 number of LEDs in the two LED lamp strings is the same, and the color temperature values are different. The flexible light bar comprises a strip-shaped substrate and the flexible light bar circuit, wherein a positive bus and a negative bus are arranged on the back of the substrate respectively along the length direction of the substrate, and a plurality of LED light-emitting assemblies are arranged on the front of the substrate along the length direction of the substrate. The power of the circuit is easy to match, color difference cannot be 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 utility model relates to a LED illumination field, in particular to luminance colour temperature synchronous adjustment LED soft lamp strip circuit to relate to the soft lamp strip that adopts this kind of circuit.
Background
The traditional mode that the LED soft lamp strip of adjustable luminance and colour temperature adopted two ways of different colour temperature LED circuit to adjust respectively, and circuit structure needs three power input lines, and such circuit need be equipped with the controller of special adjustable light and mixing of colors temperature, and adjusts luminance and mix colors temperature and separately adjust, neither easy to assemble or repack, and it is also inconvenient to adjust.
For this reason, improvements have been proposed. Specifically, the number of LEDs in two different color temperature LED circuits is set to be different 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 high; when the external dimmable LED driving power supply 11 is in a low-brightness output state, the output voltage is low, the driving current drop amplitude on the first color temperature LED circuit 12 is much larger than the driving current drop amplitude on the second color temperature LED circuit 13, the low-middle color temperature proportion in the mixed light emitted by the LED light bar is increased, so that 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 used, 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 switching on a circuit which only has an adjustable light function originally. However, such circuits also have some drawbacks: 1. the voltage regulating type LED dimming power supply adopts a voltage regulating mode, but the voltage regulating type LED dimming power supply is eliminated in the market, so that a user side is difficult to find a power supply matched with a soft light bar. 2. The color temperature change is directly related to the voltage, and when the concatenation length of the soft light bars is long, the color difference, namely the color difference, can appear due to the inconsistent voltage before and after the soft light bars.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a luminance colour temperature synchronous adjustment LED soft lamp strip circuit to solve the above-mentioned defect that prior art exists.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a luminance colour temperature synchronous adjustment LED soft lamp strip circuit, can adapt external constant voltage PWM output dimming power supply (21), LED soft lamp strip circuit includes:
a positive electrode bus bar (26);
a negative electrode bus bar (27); and
a plurality of LED light assemblies (22), each of said LED light 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;
the voltage control type semiconductor switch tube (5) is connected in the second LED lamp string (24); and
and the delay circuit (25) comprises a capacitor (6), a charging resistor (7) and a discharging resistor (8), the capacitor and the discharging resistor are connected in parallel and then bridged between the control end of the switching tube and the negative bus, and the charging resistor is bridged between the control end of the switching tube and the positive bus.
The drive current I of the first LED lamp stringWWFollowing the supply voltage VDDVarying, and the drive current I of the second LED stringCWThe driving current I is compared with the driving current I due to the action of the switching tube and the time delay circuitWWA delay time t is generatedA. Thus, when in use, the positive bus and the negative bus are connected with an external constant voltage PWM output dimming power supply, and the power supply voltage V is controlledDDNot only can the brightness of the LED light-emitting component be adjusted, but also the delay time t can be adjustedASo that when the duty ratio of the PWM waveform is changed, the current I is drivenCWOf high level tCW.ONAnd a drive current IWWOf high level tONRatio t ofCW.ON/tONIs changed so that the mixed light emitted by the LED light-emitting component is enabledThe overall color temperature is changed, thereby achieving the purpose of adjusting the brightness and the color temperature in a cycle.
In the scheme, the number of the LEDs in the two LED lamp strings is the same, the synchronous adjustment of brightness and color temperature is realized by adjusting the duty ratio of the PWM waveform, the power supply voltage VDD is kept constant, the color difference cannot be generated after the length of the soft lamp strip is increased, and theoretically, any length can be cascaded within the allowable range of the power of the dimming power supply without causing the color difference.
In the scheme, the voltage control type semiconductor switch tube is adopted, and the switch tube cannot cause delay time tADeviation is generated, so that the consistency of color temperature adjustment is good, and the product qualification rate is high.
In the above brightness and color temperature synchronous adjustment LED flexible light bar circuit, preferably, the voltage control type switching tube is an MOS tube.
The utility model also provides a luminance colour temperature synchronous adjustment LED soft lamp strip, the soft lamp strip of LED includes: a band-shaped substrate; the LED flexible lamp strip circuit is arranged on the LED flexible lamp strip circuit; the positive bus and the negative bus are respectively arranged on the back of the substrate along the length direction of the substrate, and the LED light-emitting assemblies are arranged on the front of the substrate along the length direction of the substrate.
In the above LED light bar with brightness and color temperature synchronous adjustment, preferably, the voltage control type switching tube is an MOS tube.
In the above brightness and color temperature synchronous adjustment LED flexible light bar, preferably, a mark is disposed on the surface of the substrate between adjacent LED light emitting assemblies.
In the above LED light bar with brightness and color temperature synchronous adjustment, 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 cut position and are used for connecting with an external constant voltage PWM output dimming power supply.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
as long as two input power lines are provided, the synchronous adjustment effect of brightness and color temperature can be realized only by matching with a commonly used constant voltage PWM output dimming power supply on the market, and any length can be cascaded within the allowable range of the power of the dimming power supply without causing color difference. Meanwhile, the color temperature adjustment consistency is good, and the product qualification rate is high.
Drawings
Fig. 1 is a circuit diagram of a prior art LED flexible light bar capable of adjusting light and color temperature;
fig. 2 is a circuit diagram of the LED flexible light bar of the present invention;
FIG. 3 shows the operating voltage V of the corresponding soft light bar when the corresponding external constant voltage PWM outputs the dimming power supply with different dimming ratesDDWaveform of (1), drive current I of first LED lamp stringWWWaveform of (1) and drive current I of second LED lamp stringCWThe waveform of (a);
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 control type 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 light string; 25. a delay circuit; 26. a positive bus bar; 27. and a negative electrode bus bar.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 2, the circuit for synchronously adjusting brightness and color temperature of a flexible LED light bar comprises: a positive bus bar 26, a negative bus bar 27, and a plurality of 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 time 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, wherein one end of the first LED lamp string 23 is connected with the positive bus 26, and the other end is connected with the 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 that of the first LEDs 1, and the color temperature value of the second LEDs 3 is different from that of the first LEDs 1. Specifically, in the present embodiment, the color temperature value of the first LED1 is smaller than the color temperature value of the second LED3, but the present invention can also be designed in the opposite way.
The voltage control type semiconductor switch tube 5 is connected to the second LED string 24, and the voltage control type semiconductor switch tube 5 is preferably a MOS tube.
The delay circuit 25 comprises a capacitor 6, a charging resistor 7 and a discharging resistor 8, the capacitor 6 and the discharging resistor 8 are connected in parallel and then bridged between the control end of the switch tube 5 and the negative bus 27, and the charging resistor 7 is bridged between the control end of the switch tube 5 and the positive bus 26.
As shown in FIG. 3, the output voltage of the external constant voltage PWM output dimming power supply 21 has a period tPWMThe dimming ratio is approximate to the duty ratio t of the waveformD. When the output dimming rate of the external constant voltage PWM output dimming power supply 21 is 100%, the duty ratio t of the output PWM voltage isD100% of the working voltage V of the flexible lamp stripDDFor continuous output, the driving current I of the first LED string 23WWAnd the drive current I of the second LED string 24CWAnd the two color temperatures are in a continuous maximum state, and the two color temperatures are kept in a fixed and constant proportion, so that 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 tPWMAnd may be any value between 0.0025 ms and 10 ms.
As shown in FIG. 2, the driving current I of the first LED string 23WWHas a minimum value of 0 and a maximum value of IWW.maxIs composed of a lamp strip working voltage VDDThe sum of the forward voltages of all the first LEDs 1 and the resistance value of the first current limiting resistor 2; drive current I of second LED string light 24CWHas a minimum value of 0 and a maximum value of ICW.maxIs composed of a lamp strip working voltageVDDThe 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 tube (the switch tube 5) are determined to be constant.
As shown in fig. 3, the constant pressure is externally arrangedUnder the condition that the output dimming rate of the PWM output dimming power supply 21 is lowered, the working voltage V of the soft light barDDDuty cycle tDAlso along with the reduction, the working voltage V of the soft lamp stripDDPWM waveform with high and low voltage changes and point-to-space ratio tD< 100%. At this time, the driving current I of the first LED lamp string 23WWAnd the drive current I of the second LED string 24CWWill be distinguished.
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 of the first LED string 23WWShould be following the supply voltage VDDThe waveform of the change is shown in FIG. 3, and at any period tPWMInner IWW.maxDuration of tON。
As shown in fig. 2, since the operation of the second LED string 24 is controlled by the MOS transistor (the switch transistor 5), the operating voltage V is set at the soft lamp strip operating voltageDDWhen the low level is converted into the high level, because the capacitor 6 is connected between the grid G and the source S of the MOS tube and the capacitor 6 is already at the working voltage V of the soft lamp strip by the discharge resistor 8DDAnd fully discharged in the low level stage. Therefore, the gate voltage uGSInability to mutate, uGS< starting voltage U of MOS tubeTWhen the MOS tube is in cut-off state, the driving current I of the second LED lamp string 24CWThe 0 state is still maintained; the waiting power supply charges the capacitor 6 to u through the charging resistor 7GS≥UTWhen the MOS tube is conducted, the driving current I of the second LED lamp string 24 is conductedCWJust start following the supply voltage VDD(ii) a change; at this time, the driving current I of the second LED string light 24CWRelative to the drive current I of the first LED string 23WWGenerating a fixed delay time, t shown in FIG. 3A. Thus, any period tPWMInner ICW.maxDuration of tCW.ON＝tON-tA。
As known from the LED light emitting principle and the PWM dimming principle, the light emitting brightness of the first LED string 23 and the second LED string 24 is in direct proportion to the respective driving current and the on-time in the period. Maximum value I of drive current of lamp string due to two color temperaturesWW.maxAnd ICW.maxIs a constant quantityIn a PWM pulse period tPWMIn this case, the ratio of the luminance of the second LED string 24 to the luminance of the first LED string 23 is represented by tCW.ON/tONDetermined, then tCW.ON/tON＝(1-tA/tON)(tON≥tA). Therefore, when the dimming ratio is lowered, the luminance is lowered, tONAlso becomes smaller, tCW.ON/tONAnd when the color temperature of the soft lamp strip is reduced, the low color temperature proportion in the proportion of the two color temperatures of the soft lamp strip is increased, and the total color temperature of the mixed light emitted by the soft lamp strip is reduced. Thereby achieving the purpose of adjusting brightness and color temperature in a cycle.
As shown in fig. 2, the light-emitting brightness of the second LED string 24 and the light-emitting brightness of the first LED string 23 are exchanged to obtain an opposite color temperature change effect.
As shown in FIG. 2, changing the parameters of the charging resistor 7 and the capacitor 6 will change the driving current I of the second LED string 24CWRelative to the drive current I of the first LED string 23WWResulting in a delay time, t shown in FIG. 3A(ii) a Thereby changing the slope with which the color temperature follows the change in brightness. Delay time tAAnd may be any value between 0.001 milliseconds and 5 milliseconds.
By the above, the utility model discloses a LED light-emitting component is constituteed to the parallelly connected mode of two way different colour temperature LED lamp cluster, and the LED lamp cluster of two way different colour temperatures has 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. By controlling the conduction time of the MOS tube, the proportion of the light emitting time of the two different color temperature LED lamp strings is changed under the condition of different dimming rates, so that the effect of changing the color temperature while dimming is achieved, and the purpose of synchronously adjusting the brightness and the color temperature is realized.
Therefore, as long as two input power lines are provided, the synchronous adjustment effect of brightness and color temperature can be realized only by matching with a commonly used constant voltage PWM output dimming power supply on the market, and any length can be cascaded within the allowable range of the power of the dimming power supply without causing color difference.
Due to the adoption of a voltage control type semiconductor switchWhen the capacitor 6 is charged, the charging current is not shunted by the switch tube, and the delay time t is not causedADeviation is generated, so that the consistency of color temperature adjustment is good, and the product qualification rate is high.
The utility model discloses all parts can all find ready-made miniature encapsulation size, can conveniently arrange on flexible PCB, possess practical value.
The flexible light bar comprises a strip-shaped substrate, the positive bus and the negative bus are respectively arranged on the back of the substrate along the length direction of the substrate, and the LED light-emitting assemblies are arranged on the front of the substrate along the length direction of the substrate.
Further, indicia may be provided on the surface of the substrate between adjacent ones of the LED light assemblies. Therefore, people can conveniently find the head and the tail of the LED light-emitting component and can quickly cut.
And further, the positive bus and the negative bus adopt 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 cut part, and after the cut end is plugged with a power output female seat of an external constant-voltage PWM output dimming power supply, the contact electrode is in contact with an electrode in the power output female seat to realize electric connection. Therefore, the soft lamp strip can be used after being cut, and a plug does not need to be installed.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for assisting the skilled person in understanding the content of the present invention, and can not be understood as the limitation of the protection scope of the present invention. Various decorations, equivalent changes and the like which are performed on the scheme by the technical personnel in the field under the conception of the invention are all included in the protection scope of the invention.
Claims (6)
1. The utility model provides a luminance colour temperature synchronous adjustment LED soft lamp strip circuit, can adapt external constant voltage PWM output dimming power supply (21), its characterized in that, the soft lamp strip circuit of LED includes:
a positive electrode bus bar (26);
a negative electrode bus bar (27); and
a plurality of LED light assemblies (22), each of said LED light 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;
the voltage control type semiconductor switch tube (5) is connected in the second LED lamp string (24); and
and the delay circuit (25) comprises a capacitor (6), a charging resistor (7) and a discharging resistor (8), the capacitor and the discharging resistor are connected in parallel and then bridged between the control end of the switching tube and the negative bus, and the charging resistor is bridged between the control end of the switching tube and the positive bus.
2. The circuit of claim 1, wherein the switching tube is an MOS tube.
3. The utility model provides a soft lamp strip of luminance colour temperature synchronous adjustment LED, its characterized in that, the soft lamp strip of LED includes:
a band-shaped substrate; and
the LED soft light bar circuit of claim 1;
the positive bus and the negative bus are respectively arranged on the back of the substrate along the length direction of the substrate, and the LED light-emitting assemblies are arranged on the front of the substrate along the length direction of the substrate.
4. The LED soft light bar with the brightness and the color temperature synchronously adjusted according to claim 3, wherein the switch tube is an MOS tube.
5. The LED soft light bar with synchronous brightness and color temperature adjustment according to claim 3, wherein a mark is arranged on the surface of the substrate between the adjacent LED light-emitting components.
6. The LED flexible light bar with the brightness and the color temperature synchronously adjusted according to claim 5, wherein the positive bus bar and the negative bus bar are strip-shaped metal foils, and after the light bar is cut along the mark, the positive bus bar and the negative bus bar form contact electrodes at the cut positions and are used for being connected with an external constant-voltage PWM output dimming power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920766667.0U CN210183599U (en) | 2019-05-24 | 2019-05-24 | Brightness and color temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920766667.0U CN210183599U (en) | 2019-05-24 | 2019-05-24 | Brightness and color temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip |
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| Publication Number | Publication Date |
|---|---|
| CN210183599U true CN210183599U (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920766667.0U Withdrawn - After Issue CN210183599U (en) | 2019-05-24 | 2019-05-24 | Brightness and color temperature synchronous adjustment LED soft lamp strip circuit and soft lamp strip |
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| CN (1) | CN210183599U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110087365A (en) * | 2019-05-24 | 2019-08-02 | 深圳迪亚士照明科技有限公司 | A kind of brightness colour temperature synchronous adjustment flexible LED lamp bar circuit and soft light bar |
-
2019
- 2019-05-24 CN CN201920766667.0U patent/CN210183599U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110087365A (en) * | 2019-05-24 | 2019-08-02 | 深圳迪亚士照明科技有限公司 | A kind of brightness colour temperature synchronous adjustment flexible LED lamp bar circuit and soft light bar |
| CN110087365B (en) * | 2019-05-24 | 2024-05-24 | 深圳迪亚士照明科技有限公司 | Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip |
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