CN210042294U - LED color temperature adjusting circuit and device - Google Patents
LED color temperature adjusting circuit and device Download PDFInfo
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- CN210042294U CN210042294U CN201821925785.3U CN201821925785U CN210042294U CN 210042294 U CN210042294 U CN 210042294U CN 201821925785 U CN201821925785 U CN 201821925785U CN 210042294 U CN210042294 U CN 210042294U
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- 239000003990 capacitor Substances 0.000 claims description 47
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
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- 238000010586 diagram Methods 0.000 description 13
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Abstract
The embodiment of the utility model discloses a LED color temperature adjusting circuit, which comprises a LED driving power supply, a first LED load, a second LED load, a signal sampling circuit, a signal turning circuit and a second LED load driving circuit, wherein the LED driving power supply is respectively connected with the first LED load, the first end of the signal turning circuit and the second LED load; the input end of the signal sampling circuit is connected with a signal source, and the output end of the signal sampling circuit is connected with the second end of the signal overturning circuit so as to collect the signal of the signal source and transmit the signal to the signal overturning circuit; the third end of the signal turning circuit is connected with one end of the LED drive circuit so as to receive the signal transmitted by the signal sampling circuit, invert the signal and transmit the signal to the second LED load drive circuit; the other end of the second LED load driving circuit is connected with the second LED load so as to receive the inverted signal and control the on and off of the second LED load. The utility model discloses can adjust the whole colour temperature of LED in this circuit.
Description
Technical Field
The embodiment of the utility model provides a relate to LED colour temperature regulation technical field, especially relate to a LED colour temperature regulating circuit and device.
Background
In a traditional silicon controlled light dimming LED product, mains supply transmits phase-cut mains supply voltage to an LED device through a silicon controlled light dimmer, wherein the LED device comprises an LED driving power supply and an LED load. The LED driving power supply changes output current along with the change of input voltage, and the output current is supplied to an LED load to change the brightness of the LED. The method has the core principle that the input voltage is changed by phase-cut of the silicon controlled rectifier, so that the brightness of the LED is changed, the function of the product is single, the brightness of the LED can be changed only, and the color temperature of the LED cannot be adjusted.
Therefore, how to adjust the color temperature of the LED is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a LED colour temperature regulating circuit to can only change LED luminance among the solution prior art, can't adjust the technical problem of LED's colour temperature.
In order to achieve the above object, the embodiment of the present invention provides a specific technical solution of a LED color temperature adjusting circuit, which is:
the utility model provides a LED colour temperature regulating circuit, includes LED drive power supply, first LED load, second LED load, signal sampling circuit, signal upset circuit and second LED load drive circuit, wherein:
the LED driving power supply is respectively connected with the first LED load, the first end of the signal overturning circuit and the second LED load;
the input end of the signal sampling circuit is connected with a signal source, and the output end of the signal sampling circuit is connected with the second end of the signal overturning circuit so as to collect the signal of the signal source and transmit the signal to the signal overturning circuit;
the third end of the signal turning circuit is connected with one end of the LED drive circuit so as to receive the signal transmitted by the signal sampling circuit, invert the signal and transmit the signal to the second LED load drive circuit;
the other end of the second LED load driving circuit is connected with the second LED load so as to receive the inverted signal and control the on and off of the second LED load.
Further, the signal sampling circuit includes a first diode, a first resistor, a first capacitor, and a second resistor connected between the signal source and ground, wherein: the first diode and the first resistor are connected in series and are connected with the first capacitor and the second resistor which are connected in parallel, and the first capacitor and the second resistor are grounded.
Furthermore, the signal turning circuit comprises a third resistor and a first triode which are connected between the LED driving power supply and the ground, the base electrode of the first triode is connected with the parallel connection end of the first capacitor and the second resistor, which is connected with the first resistor, the collector electrode of the first triode is connected with the third resistor, and the emitter electrode of the first triode is grounded;
the second LED load driving circuit comprises a first MOS tube, the grid electrode of the first MOS tube is connected with the collector electrode of the first triode, the source electrode of the first MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the second LED load.
Furthermore, the signal turning circuit comprises a third resistor and a second MOS tube which are connected between the LED driving power supply and the ground, the grid electrode of the second MOS tube is connected with the parallel connection end of the first capacitor and the second resistor, which is connected with the first resistor, the drain electrode of the second MOS tube is connected with the third resistor, and the source electrode of the second MOS tube is grounded;
the second LED load driving circuit comprises a second triode, the base electrode of the second triode is connected with the drain electrode of the second MOS tube, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the second LED load.
Furthermore, the LED color temperature adjusting circuit also comprises a fourth resistor, one end of the fourth resistor is connected with the parallel connection end of the first capacitor and the second resistor, which is connected with the first resistor, and the other end of the fourth resistor is connected with the base electrode of the first triode; or,
the LED color temperature adjusting circuit further comprises a fourth resistor, one end of the fourth resistor is connected with a parallel connection end of the first capacitor and the second resistor, the parallel connection end of the first capacitor and the second resistor is connected with the first resistor, and the other end of the fourth resistor is connected with a grid electrode of the second MOS tube.
Further, the LED color temperature adjusting circuit further comprises a fifth resistor connected between the collector of the first triode and the gate of the first MOS transistor, and a sixth resistor connected between the gate of the first MOS transistor and ground; or,
the LED color temperature adjusting circuit further comprises a fifth resistor connected between the drain electrode of the second MOS tube and the base electrode of the second triode, and a sixth resistor connected between the base electrode of the second triode and the ground.
Furthermore, the LED color temperature adjusting circuit further comprises a second diode and a second capacitor, one end of the second diode is connected with the LED driving power supply, the other end of the second diode is connected with the third resistor and the first LED load respectively, one end of the second capacitor is connected with the second diode and the third resistor respectively, and the other end of the second capacitor is grounded.
Further, the forward voltage value of the second LED load is lower than that of the first LED load.
Further, the LED color temperature adjusting circuit further comprises a seventh resistor connected between the second LED load and the drain of the first MOS transistor; or,
the LED color temperature adjusting circuit further comprises a seventh resistor connected between the second LED load and the collector of the second triode.
Further, the LED color temperature adjusting circuit further comprises a third capacitor connected in parallel to two ends of the second LED load; or,
the LED color temperature adjusting circuit further comprises a fourth capacitor connected between the grid of the first MOS tube and the ground; or,
the LED color temperature adjusting circuit further comprises a fourth capacitor connected between the base of the second triode and the ground.
Further, the signal source is the LED driving power source, or the signal source is another transformer winding different from the LED driving power source, or the signal source is a first LED load.
The embodiment of the utility model provides a still provide a LED colour temperature adjusting device, including silicon controlled rectifier dimmer and as above LED colour temperature regulating circuit, silicon controlled rectifier dimmer with LED colour temperature regulating circuit connects.
The utility model discloses LED colour temperature regulating circuit's advantage lies in: the signal sampling circuit is used for collecting voltage signals, the voltage signals are overturned and transmitted to the second LED load driving circuit through the signal overturning circuit, and the second LED load driving circuit controls the connection and disconnection of a second LED load connected with the second LED load driving circuit, so that the whole color temperature of LEDs in the whole circuit is controlled according to different sampling voltages.
Drawings
Fig. 1 is a schematic structural diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 3 is a circuit structure diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 4 is a circuit structure diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 5 is a circuit structure diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 6 is a circuit structure diagram of the embodiment of the present invention for obtaining voltage from the LED power supply winding T1;
fig. 7 is a circuit diagram of the embodiment of the present invention for obtaining voltage from the transformer winding T2;
fig. 8 is a circuit diagram of an embodiment of the present invention for obtaining voltage from two ends of the LED 1;
fig. 9 is a circuit structure diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an LED color temperature adjusting device according to an embodiment of the present invention.
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the LED color temperature adjusting circuit of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, it is a schematic structural diagram of an LED color temperature adjusting circuit according to an embodiment of the present invention. The circuit includes an LED drive power supply 110, a first LED load 120, a second LED load 130, a signal sampling circuit 140, a signal flipping circuit 150, and a second LED load drive circuit 160. The LED driving power supply 110 is respectively connected to the first LED load 120, the first end of the signal flipping circuit 150, and the second LED load 130; the input end of the signal sampling circuit 140 is connected to a signal source, and the output end is connected to the second end of the signal flipping circuit 150, so as to collect the signal of the signal source and transmit the signal to the signal flipping circuit 150; the third end of the signal flipping circuit 150 is connected to one end of the LED driving circuit 110 to receive the signal transmitted by the signal sampling circuit 140, flip the signal and transmit the signal to the second LED load driving circuit 160; the other end of the second LED load driving circuit 160 is connected to the second LED load 130 to receive the inverted signal and control the second LED load 130 to be turned on and off.
The circuit can be used in a silicon controlled dimmer LED product, and the signal sampling circuit 140 receives an envelope signal chopped by the silicon controlled dimmer and transmits the envelope signal to the signal inverting circuit 150.
The utility model discloses LED colour temperature regulating circuit passes through signal sampling circuit and gathers voltage signal, through signal upset circuit with voltage signal upset and transmit for second LED load drive circuit, the second LED load drive circuit control rather than the second LED load of being connected switch on and turn-off to the realization is according to the whole colour temperature of LED in the whole circuit of sampling voltage control of difference.
As shown in fig. 2, it is a circuit structure diagram of the LED color temperature adjusting circuit according to the embodiment of the present invention. The first LED load is LED1, and the second LED load is LED 2. The LED driving power supply 110 includes a transformer winding T1.
The signal sampling circuit 140 includes a diode D1, a resistor R1, a capacitor C1, and a resistor R2 connected between the signal source and ground, wherein: the diode D1 and the resistor R1 are connected in series and are connected with the capacitor C1 and the resistor R2 which are connected in parallel, and the capacitor C1 and the resistor R2 are grounded. The diode D1, the resistor R1 and the capacitor C1 filter out the switching high-frequency signal in the conduction time after the phase of the SCR dimmer is cut off, and the switching high-frequency signal is converted into a waveform similar to that of the SCR dimmer after the phase of the SCR dimmer is cut off.
The signal inversion circuit 150 comprises a resistor R3 and a transistor Q1 connected between the LED driving power supply 110 and the ground, wherein a base b of the transistor Q1 is connected with a parallel connection end of a capacitor C1 and a resistor R2, which is connected with the resistor R1, a collector C is connected with a resistor R3, and an emitter e is grounded.
The second LED load driving circuit 160 includes a MOS transistor Q2, a gate G of the MOS transistor Q2 is connected to a collector c of the transistor Q1, a source S is grounded, and a drain D is connected to the LED 2.
When the transistor Q1 is turned off, the resistor R3 may provide a voltage (i.e., a gate voltage) for turning on the transistor Q2 to the transistor Q2.
The circuit can be used in a silicon controlled dimmer LED product, and the signal sampling circuit 140 receives an envelope signal chopped by the silicon controlled dimmer and transmits the envelope signal to the signal inverting circuit 150. Therefore, the envelope signal chopped by the thyristor dimmer is transmitted to the base b of the diode Q1 through the diode D1, the resistor R1, the capacitor C1 and the resistor R2, and an inverse square wave signal of the chopped signal of the thyristor dimmer is obtained at the collector C of the transistor Q1 through the signal inverting circuit 150 composed of the resistor R3 and the transistor Q1, and the square wave signal drives the MOS transistor Q2 to control the on-off of the LED2 connected with the MOS transistor Q2. Specifically, it can control the turning on, turning off, and the duration of the turning on and off of the LED2, thereby adjusting the brightness of the LED2, and ultimately the overall color temperature of the circuit.
For example, when the dimming angle of the thyristor is 80% of the brightness, the circuit also obtains an 80% positive duty cycle signal through the diode D1, the resistor R1, the capacitor C1 and the resistor R2, the signal is transmitted to the signal flipping circuit 150 composed of the resistor R3 and the transistor Q1 to convert the 80% positive duty cycle signal into a 20% positive duty cycle signal, the 20% positive duty cycle signal is input to the base G of the MOS transistor Q2, the MOS transistor Q2 has 20% of the on-time, and the on-time of the LED2 is short, so that the overall color temperature of the entire LED device is biased to the color temperature of the LED 1. On the contrary, when the dimming angle of the thyristor is 10% of the brightness, the circuit also obtains a 10% positive duty cycle signal through the diode D1, the resistor R1, the capacitor C1 and the resistor R2, the signal is transmitted to the signal turning circuit 150 composed of the resistor R3 and the triode Q1 to convert the 10% positive duty cycle signal into a 90% positive duty cycle signal, the 90% positive duty cycle signal is input to the base G of the MOS transistor Q2, the MOS transistor Q2 has 90% on-time, and the on-time of the LED2 is longer, so that the overall color temperature of the whole LED device is biased to the color temperature between the LED1 and the LED 2.
In the LED circuit, two LED strings are connected in parallel, and a current having a low VF value is larger than a current having a high VF value. Therefore, if wide color temperature adjustment is required, the color temperature of the LED2 is biased when the triac dimmer is dimmed to low brightness, and the Forward Voltage value VF2 of the LED2 needs to be set lower than the Forward Voltage value VF1 of the LED 1. At this time, the current flowing through the LED2 is much larger than the current flowing through the LED1 when the MOS transistor Q2 is turned on for 90%, so that the color temperature is biased toward the LED2, thereby achieving the purpose of wide color temperature adjustment.
When VF2 is set to be less than VF1, the voltage of VF1 reduced by VF2 is dropped between the drain and the source of the MOS transistor Q2, so as to form a very large overshoot current, and at this time, the resistor R7 is added to prevent the overshoot current, thereby achieving the purpose of protecting the MOS transistor Q2. As shown in fig. 3, the LED color temperature adjusting circuit further includes a resistor R7 connected between the LED2 and the drain of the MOS transistor Q2.
The LED color temperature adjusting circuit can further comprise a resistor R4, one end of a resistor R4 is connected with a parallel connection end of the capacitor C1 and the resistor R2, the parallel connection end of the resistor R1 is connected with the resistor R2, and the other end of the resistor R4 is connected with a base b of the triode Q1. The envelope signal chopped by the thyristor dimmer collected by the diode D1, the resistor R1, the capacitor C1 and the resistor R2 is transmitted to the base b of the diode Q1 through the resistor R4. The resistor R4 is a current limiting resistor, which limits the voltage divided by the resistor R1 and the resistor R2 to control the conduction of the transistor Q1.
The LED color temperature adjusting circuit can further comprise a resistor R5 connected between the collector c of the transistor Q1 and the gate G of the MOS transistor Q2, and a resistor R6 connected between the gate G of the MOS transistor Q2 and the ground. The envelope signal chopped by the silicon controlled dimmer is transmitted to a base b of a diode Q1 through a diode D1, a resistor R1, a capacitor C1 and a resistor R2, a reverse square wave signal of the chopped signal of the silicon controlled dimmer is obtained at a collector C of the triode Q1 through a signal overturning circuit 150 consisting of a resistor R3 and a triode Q1, and the square wave signal drives a MOS tube Q2 through the resistor R5 so as to control the on-off of an LED2 connected with the MOS tube Q2. The resistor R5 is a driving resistor of the MOS transistor Q2, and is used for buffering a charging current of a junction capacitor of the MOS transistor Q2.
The LED color temperature adjusting circuit can further comprise a resistor R6 connected between the grid G of the MOS transistor Q1 and the ground. R6 is the gate ground resistance of MOS transistor Q2.
The LED color temperature adjusting circuit can further comprise a diode D2 and a capacitor C2, one end of the diode D2 is connected with the LED driving power supply 110, the other end of the diode D2 is connected with the resistor R3 and the LED1 respectively, one end of the capacitor C2 is connected with the diode D2 and the resistor R3 respectively, and the other end of the capacitor C2 is grounded.
Because the signal that MOS pipe Q2 switches on the output is the square wave, can lead to LED2 to have the stroboscopic, connect a electric capacity C3 in parallel at LED2 both ends, can remove the stroboscopic. As shown in fig. 4, the LED color temperature adjusting circuit further includes a capacitor C3 connected in parallel to two ends of the LED2, so as to achieve the purpose of removing stroboflash.
In another embodiment, a capacitor C4 may be further added to the gate G of the MOS transistor Q2, the square wave of the gate G of the MOS transistor Q2 is filtered into a dc signal, and since the duty ratio of the MOS transistor Q2 is inversely changed along with the input signal of the triac dimmer, the filtered dc voltages will be different for the square waves with different duty ratios, and therefore, the dc filtered out from the square wave in the same state causes the MOS transistor Q2 to operate in a "conduction region", a "varistor region" or a "cutoff region" to control the current flowing through the LED 2. As shown in fig. 5, the LED color temperature adjusting circuit further includes a capacitor C4 connected between the gate G of the MOS transistor Q2 and ground, and the capacitor C4 filters the square wave of the gate G of the MOS transistor Q2 into a dc signal, thereby achieving the purpose of removing stroboflash.
The signal sampling circuit 140 can obtain the voltage from the signal source by several means:
1. the signal source is an LED driving power source, that is, the signal sampling circuit directly obtains a voltage signal on the LED power supply winding, for example, obtains a voltage from the LED power supply winding T1 shown in fig. 6;
2. taken at the other transformer winding, e.g. from another transformer winding T2 than the LED supply winding T1 as shown in fig. 7;
3. the signal source is an LED1, for example, the signal sampling circuit can obtain signals from two ends of the LED1 shown in fig. 8, and can obtain different sampling voltage signals according to the change of the VF value of the LED1 with the change of the brightness during the dimming process, and the voltage signals can control the transistor Q1 to operate in a conducting region, an amplifying region or a cut-off region. The signal is transmitted to the gate G of the MOS transistor Q2 after being inverted by the triode Q1, so that the MOS transistor Q2 can work in a conducting region, a variable resistance region or a cut-off region, the brightness of the LED2 can be controlled, and the purpose of changing the color temperature is achieved. R1 can be a resistor or a voltage regulator tube.
Alternatively, the transistor Q1 may be replaced by a MOS transistor, and the MOS transistor Q2 may be replaced by a transistor. Specifically, in another embodiment, as shown in fig. 9, the signal inverting circuit 150 includes a resistor R3 and a MOS transistor Q3 connected between the LED driving power source 110 and the ground, a gate G of the MOS transistor Q3 is connected to a parallel connection end of the capacitor C1 and the resistor R2, which is connected to the resistor R1, a drain D is connected to the resistor R3, and a source S is grounded. The LED load driving circuit 160 includes a transistor Q4, a base b of a transistor Q4 is connected to a drain D of a MOS transistor Q3, an emitter e is grounded, and a collector c is connected to the LED load 130. Other parts of the circuit of this embodiment are the same as those described in the above embodiment, and the structure and the operation principle thereof will not be described herein again.
In the embodiment of the utility model, when the silicon controlled rectifier dimmer is adjusted to the maximum brightness, the circuit of the embodiment of the utility model turns off the LED2 or lights the LED2 for a time with a smaller duty ratio, so that the whole color temperature is biased to the color temperature of the LED 1; when the silicon controlled rectifier dimmer transferred lower luminance, through the utility model discloses the circuit switches on LED2 completely or lets it switch on the time of a great duty cycle, lets its whole colour temperature be partial to the colour temperature of LED2, reaches colour temperature adjustable purpose.
Specifically, a voltage signal is collected through a signal sampling circuit, a phase-cut signal of the silicon controlled rectifier dimmer is inverted through a signal inverting circuit and is transmitted to a grid G of an MOS tube Q2 in a second LED load driving circuit, the MOS tube Q2 controls the connection and disconnection of an LED2 connected with the MOS tube Q2, when the silicon controlled rectifier dimmer adjusts to the maximum output voltage, namely, the signal with the maximum duty ratio, the LED1 is brightest at the moment, the inverted signal is the signal with the minimum duty ratio to drive the MOS tube Q2, the conduction time of the MOS tube Q2 is shortest, the brightness of the LED2 is smaller, and the integral color temperature is biased to the LED 1. Similarly, when the thyristor dimmer is adjusted to the minimum output voltage, the LED1 is dark at this time, the inverted signal is the signal with the largest duty cycle to drive the MOS transistor Q2, the conduction time of the MOS transistor Q2 is the longest, the LED2 is bright, and the overall color temperature is biased to the LED 2. Therefore, the whole color temperature of the LED in the whole circuit is controlled according to different sampling voltages. When the brightness of the whole product is high, the color temperature is close to that of the LED 1; at low overall product brightness, the color temperature is close to that of the LED 2.
The embodiment of the utility model provides a still provide a LED colour temperature adjusting device, as shown in FIG. 10, do the utility model discloses LED colour temperature adjusting device's schematic structure diagram. The device comprises a silicon controlled dimmer 210 and an LED color temperature adjusting circuit 220, wherein the silicon controlled dimmer 210 is connected with the LED color temperature adjusting circuit 220. The specific structure and operation principle of the LED color temperature adjusting circuit 220 are the same as those described in the above embodiments, and are not described herein again.
The utility model discloses among the LED colour temperature adjusting device, gather voltage signal through the signal sampling circuit among the LED colour temperature adjusting circuit, through signal upset circuit with voltage signal upset and transmit for second LED load drive circuit, second LED load drive circuit control rather than the second LED load of being connected switch on and turn-off to the realization is according to the whole colour temperature of LED in the whole circuit of sampling voltage control of difference.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (17)
1. The utility model provides a LED colour temperature regulating circuit which characterized in that, includes LED drive power supply, first LED load, second LED load, signal sampling circuit, signal flip circuit and second LED load drive circuit, wherein:
the LED driving power supply is respectively connected with the first LED load, the first end of the signal overturning circuit and the second LED load;
the input end of the signal sampling circuit is connected with a signal source, and the output end of the signal sampling circuit is connected with the second end of the signal overturning circuit so as to collect the signal of the signal source and transmit the signal to the signal overturning circuit;
the third end of the signal turning circuit is connected with one end of the LED drive circuit so as to receive the signal transmitted by the signal sampling circuit, invert the signal and transmit the signal to the second LED load drive circuit;
the other end of the second LED load driving circuit is connected with the second LED load so as to receive the inverted signal and control the on and off of the second LED load.
2. The LED color temperature adjustment circuit of claim 1, wherein the signal sampling circuit comprises a first diode, a first resistor, a first capacitor, and a second resistor connected between the signal source and ground, wherein: the first diode and the first resistor are connected in series and are connected with the first capacitor and the second resistor which are connected in parallel, and the first capacitor and the second resistor are grounded.
3. The LED color temperature adjusting circuit according to claim 2, wherein the signal inverting circuit comprises a third resistor and a first triode connected between the LED driving power supply and the ground, the base of the first triode is connected with the parallel connection end of the first capacitor and the second resistor, which is connected with the first resistor, the collector of the first triode is connected with the third resistor, and the emitter of the first triode is grounded;
the second LED load driving circuit comprises a first MOS tube, the grid electrode of the first MOS tube is connected with the collector electrode of the first triode, the source electrode of the first MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the second LED load.
4. The LED color temperature adjusting circuit according to claim 2, wherein the signal inverting circuit comprises a third resistor and a second MOS transistor connected between the LED driving power supply and the ground, the gate of the second MOS transistor is connected with the parallel connection end of the first capacitor and the second resistor connected with the first resistor, the drain of the second MOS transistor is connected with the third resistor, and the source of the second MOS transistor is grounded;
the second LED load driving circuit comprises a second triode, the base electrode of the second triode is connected with the drain electrode of the second MOS tube, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the second LED load.
5. The LED color temperature adjusting circuit according to claim 3, further comprising a fourth resistor, wherein one end of the fourth resistor is connected to the parallel connection end of the first capacitor and the second resistor and the first resistor, and the other end of the fourth resistor is connected to the base of the first triode.
6. The LED color temperature adjusting circuit according to claim 4, further comprising a fourth resistor, wherein one end of the fourth resistor is connected to the parallel connection end of the first capacitor and the second resistor and the first resistor, and the other end of the fourth resistor is connected to the gate of the second MOS transistor.
7. The LED color temperature adjusting circuit of claim 3, further comprising a fifth resistor connected between the collector of the first transistor and the gate of the first MOS transistor, and a sixth resistor connected between the gate of the first MOS transistor and ground.
8. The LED color temperature adjusting circuit of claim 4, further comprising a fifth resistor connected between the drain of the second MOS transistor and the base of the second transistor, and a sixth resistor connected between the base of the second transistor and ground.
9. The LED color temperature adjusting circuit according to claim 3 or 4, further comprising a second diode and a second capacitor, wherein one end of the second diode is connected to the LED driving power supply, the other end of the second diode is connected to the third resistor and the first LED load, the other end of the second capacitor is connected to the second diode and the third resistor, and the other end of the second capacitor is grounded.
10. The LED color temperature adjusting circuit according to claim 3, wherein the forward voltage value of the second LED load is lower than the forward voltage value of the first LED load.
11. The LED color temperature adjusting circuit according to claim 4, wherein the forward voltage value of the second LED load is lower than the forward voltage value of the first LED load.
12. The LED color temperature adjusting circuit of claim 10, further comprising a seventh resistor connected between the second LED load and the drain of the first MOS transistor.
13. The LED color temperature adjustment circuit of claim 11, further comprising a seventh resistor connected between the second LED load and the collector of the second transistor.
14. The LED color temperature adjustment circuit of claim 3, further comprising a third capacitor connected in parallel across the second LED load; or,
the LED color temperature adjusting circuit further comprises a fourth capacitor connected between the grid of the first MOS tube and the ground.
15. The LED color temperature adjusting circuit of claim 4, further comprising a fourth capacitor connected between the base of the second transistor and ground.
16. The LED color temperature adjusting circuit according to any one of claims 1-4, wherein the signal source is the LED driving power supply, or the signal source is another transformer winding different from the LED driving power supply, or the signal source is the first LED load.
17. An LED color temperature adjusting device, characterized by comprising a silicon controlled dimmer and an LED color temperature adjusting circuit as claimed in any one of claims 1 to 16, wherein the silicon controlled dimmer is connected with the LED color temperature adjusting circuit.
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| CN109496013A (en) * | 2018-11-21 | 2019-03-19 | 深圳和而泰智能照明有限公司 | LED colour temperature adjusts circui and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109496013A (en) * | 2018-11-21 | 2019-03-19 | 深圳和而泰智能照明有限公司 | LED colour temperature adjusts circui and device |
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Effective date of registration: 20230220 Address after: 1010-1011, 10 / F, block D, Shenzhen Aerospace Science and Technology Innovation Research Institute building, no.6, Keji south 10 road, high tech South Zone, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN H&T INTELLIGENT CONTROL Co.,Ltd. Address before: 518000 4 / F, R & D building, heertai Industrial Park, Genyu Road, mold base, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN H&T INTELLIGENT LIGHTING Co.,Ltd. |
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