CN215734939U - Constant-power LED dimming circuit - Google Patents
Constant-power LED dimming circuit Download PDFInfo
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- CN215734939U CN215734939U CN202120519624.XU CN202120519624U CN215734939U CN 215734939 U CN215734939 U CN 215734939U CN 202120519624 U CN202120519624 U CN 202120519624U CN 215734939 U CN215734939 U CN 215734939U
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Abstract
The utility model provides a constant-power LED dimming circuit, which comprises: a first light emitting loop; the second light-emitting loop is connected with the first light-emitting loop in parallel; a first switch connected in series to the first light-emitting circuit; the second switch is connected in series with the second light-emitting circuit; the control signal output end is connected with the control end of the first switch; and the inverting circuit is connected between the control signal output end and the control end of the second control switch. The beneficial effects are that: the LED color temperature control circuit is simple in wiring and high in functionality, the color temperature of the two groups of LED modules can be respectively adjusted through one group of control signals, and the total power of the two groups of load circuits can be kept unchanged due to the fact that only one group of driving power supply is adopted, so that the effect of constant power is achieved.
Description
Technical Field
The utility model relates to the technical field of illumination control, in particular to a constant-power LED dimming circuit.
Background
LED lighting devices are gradually replacing traditional lighting devices due to their energy-saving and durable properties. In recent years, with the development of LED dimming technology, users can adjust the color temperature of LED lamps as required, so that LEDs have different lighting and visual effects.
In the dimming mode of the LED lamp in the prior art, the corresponding constant-power operation of the LED lamp can be controlled mainly through a group of control signals and an independent driving power supply, and because the color temperature adjustment needs to be formed by combining two groups of LED lamps with different color temperatures, the total power of the two groups of LED lamps is ensured to be unchanged, so that certain difficulty exists. Therefore, in order to solve the above problems, the present invention provides a constant power LED dimming circuit.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a constant-power LED dimming circuit, which comprises:
a first light emitting loop;
the second light-emitting loop is connected with the first light-emitting loop in parallel;
a first switch connected in series to the first light-emitting loop;
the second switch is connected in series with the second light-emitting circuit;
the control signal output end is connected with the control end of the first switch;
and the inverting circuit is connected between the control signal output end and the control end of the second control switch.
Preferably, the inverter circuit includes:
a first voltage output terminal;
one end of the first resistor is connected with the first voltage output end;
the collector of the first triode is connected with the other end of the first resistor, the emitter of the first triode is grounded, and the base of the first triode is connected with the control signal output end;
and the collector electrode of the first triode is also connected with the control end of the second switch.
Preferably, the control signal output end is connected with the control end of the first switch through a second resistor, and the control signal output end is connected with the inverter circuit through the second resistor.
Preferably, the first triode is an NPN-type triode.
Preferably, the first switch and the second switch are NMOS transistors.
Preferably, the inverter circuit includes:
one end of the third resistor is connected with the control model output end, and the other end of the third resistor is connected with the control end of the first switch;
the first switch is a second triode, the collector of the second triode is connected with the light-emitting device in the first light-emitting loop, the emitter of the second triode is grounded, and the base of the second triode forms the control end of the first switch;
and the collector electrode of the second triode is also connected with the control end of the second switch.
Preferably, the second switch is a third triode, a base of the third triode is connected with a collector of the second triode through a fourth resistor, the collector of the third triode is connected with a light emitting device in the second light emitting loop, and an emitter of the third triode is grounded.
Preferably, the control signal output end is connected with the inverter circuit through an optical coupling circuit.
Preferably, the control signal output terminal outputs a pulse width modulation signal.
Preferably, the lighting device further comprises a rectifying driving device, the rectifying driving device comprises an output end, and the first light-emitting circuit and the second light-emitting circuit are connected in parallel between the output end of the rectifying driving device and the ground.
The technical scheme has the following advantages or beneficial effects: the LED color temperature control circuit is simple in wiring and high in functionality, the color temperature of the two groups of LED modules can be respectively adjusted through one group of control signals, and the total power of the two groups of load circuits can be kept unchanged due to the fact that only one group of driving power supply is adopted, so that the effect of constant power is achieved.
Drawings
FIG. 1 is a circuit diagram of a constant power LED dimming circuit according to a first preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a constant power LED dimming circuit according to a second preferred embodiment of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In accordance with the above-mentioned problems of the prior art, there is provided a constant power LED dimming circuit, as shown in fig. 1 and 2, comprising:
a first light emitting loop 1;
a second light-emitting circuit 2 connected in parallel with the first light-emitting circuit 1;
a first switch M1 connected in series to the first light-emitting circuit 1;
a second switch M2 connected in series to the second light-emitting circuit 2;
a control signal output terminal 3 connected to the control terminal of the first switch M1;
and the inverter circuit 4 is connected between the control signal output end 3 and the control end of the second control switch.
A specific embodiment is now provided to further explain and explain the present technical solution:
the control signal output end 3 of the utility model can generate a corresponding control signal to adjust the color temperature of the first light-emitting loop 1 and the second light-emitting loop 2 according to the illumination requirements of the LED lamp on different occasions. The color temperatures of the LED lamps in the first light-emitting loop 1 and the second light-emitting loop 2 are different, the duty ratio of the control signal generated by the control signal output terminal 3 can be adjusted to adjust the color temperature, if the input duty ratio is 75%, that is, the high level occupies 75% in a control signal period, the first switch M1 is turned on when the input terminal is at the high level, and the on-time of the first switch M1 to the first light-emitting loop 1 can be changed according to the duty ratio of the control signal, so as to change the color temperature of the first light source loop; because the control signal output end 3 is also connected with the inverter circuit 4, an inverted signal opposite to the control signal can be obtained through the control signal of the inverter circuit 4, if the duty ratio of the control signal is 75%, the duty ratio of the inverted signal is 25%, the second switch M2 is conducted when the input end is at a high level, and the conducting time of the second switch M2 to the second light-emitting loop 2 can be changed according to the duty ratio of the inverted signal, so as to change the color temperature of the second light-emitting loop 2, in the process of adjusting the color temperature of the first light-emitting loop 1 and the second light-emitting loop 2, the sum of the duty ratios of the control signal and the inverted signal is always 100%, so that the simultaneous adjustment of the color temperature of the first light-emitting loop 1 and the second light-emitting loop 2 can be realized by adjusting and changing the duty ratio of a group of control signals, and two independent control signals are not needed to respectively adjust the first light-emitting loop 1 and the second light-emitting loop 2, the effectiveness and the simplicity of dimming are improved.
In the preferred embodiment of the present invention, the inverter circuit 4 includes:
a first voltage output terminal 41;
a first resistor R1, one end of which is connected to the first voltage output terminal 41;
a first triode Q1, the collector of which is connected with the other end of the first resistor R1, the emitter of which is grounded, and the base of which is connected with the control signal output end 3;
the collector of the first transistor Q1 is also connected to the control terminal of the second switch M2.
Specifically, in this embodiment, the first transistor Q1 is used to realize the function of the inverter in the inverter circuit 41, and therefore, a collector of the first transistor Q1 needs to be connected to a first resistor R1, an emitter of the first transistor Q1 is grounded, so that the first transistor Q1 can be in a working state suitable for the switching value, so as to output the high level input in the control signal as the low level, and output the low level input as the high level, and the collector of the first transistor Q1 is further connected to the control end of the second switch M2, so as to send the inverted signal to the second switch M2, and the second switch M2 can control the on/off of the second light emitting circuit 2 according to the inverted signal, thereby realizing the adjustment of the color temperature of the second light emitting circuit 2.
In the preferred embodiment of the present invention, the control signal output terminal 3 is connected to the control terminal of the first switch M1 through a second resistor R2, and the control signal output terminal 3 is connected to the inverter circuit 4 through a second resistor R2.
Specifically, in this embodiment, the control signal output end 3 is directly connected to the control end of the first switch M1, so that the control signal is directly sent to the first switch M1, and the first switch M1 can control the on/off of the first light-emitting loop 1 according to the control signal; the second switch M2 needs to send an inverted signal obtained by inverting the control signal through the inverting circuit 4 to the control end of the second switch M2, so as to control the on/off of the second light-emitting loop 2.
In the preferred embodiment of the present invention, the first transistor Q1 is an NPN transistor.
In the preferred embodiment of the present invention, as shown in fig. 1, the first switch M1 and the second switch M2 are NMOS transistors.
Specifically, in this embodiment, the first switch M1 and the second switch M2 are both NMOS transistors, and are turned on when the input of the control terminal is high level and turned off when the input of the control terminal is low level, the gate of the first switch M1 is connected to the second resistor R2, the drain of the first switch M1 is connected to the light emitting device of the first light emitting loop 1, and the source of the first switch M1 is grounded; the gate of the second switch M2 is connected to the collector of the first transistor Q1, the drain of the second switch M2 is connected to the light emitting device of the second light emitting circuit 2, and the source of the second switch M2 is grounded.
In the preferred embodiment of the present invention, the inverter circuit 4 includes:
one end of the third resistor R3 is connected with the output end of the control model, and the other end of the third resistor R3 is connected with the control end of the first switch M1;
as an alternative embodiment, as shown in fig. 2, the first switch M1 is a second transistor, a collector of the second transistor is connected to the light emitting device in the first light emitting loop 1, an emitter of the second transistor is grounded, and a base of the second transistor forms a control terminal of the first switch M1;
the collector of the second triode is also connected with the control end of the second switch M2.
In an alternative embodiment, the second switch M2 is a third transistor, a base of the third transistor is connected to a collector of the second transistor through a fourth resistor R4, the collector of the third transistor is connected to the light emitting device in the second light emitting circuit 2, and an emitter of the third transistor is grounded.
Specifically, in this embodiment, the first switch M1 and the second switch M2 can be both triodes, and both can respectively control the on/off of the first light-emitting circuit 1 and the second light-emitting circuit 2 according to the corresponding control signal and the inverted signal, which can play an equivalent role with the NMOS transistor.
In the preferred embodiment of the present invention, the control signal output terminal 3 is connected to the inverter circuit 4 through the optical coupling circuit 5.
Specifically, in the present embodiment, the optical coupling circuit 5 can perform isolation protection on the control signal sent to the inverter circuit 4 to prevent the interference of electromagnetic radiation.
In the preferred embodiment of the present invention, the control signal output terminal 3 outputs a pulse width modulation signal.
In a preferred embodiment of the present invention, the lighting device further includes a rectifying driving device U, the rectifying driving device U includes an output end, and the first light emitting loop 1 and the second light emitting loop 2 are connected in parallel between the output end of the rectifying driving device U and the ground.
Specifically, in the embodiment, the pwm signal is simply and flexibly controlled, and the change of the on-time of the first switch M1 and the second switch M2 is controlled by the change of the corresponding load, so as to change the output power of the first light-emitting loop 1 and the second light-emitting loop 2, so as to adjust the color temperature, and ensure that the output voltage of the rectifying driving device U is unchanged, and the rectifying driving device U is constant power, so that the power of the rectifying driving device U is constant no matter how the output power of the first light-emitting loop 1 and the second light-emitting loop 2 changes, and the constant power dimming of the first light-emitting loop 1 and the second light-emitting loop 2 is realized.
In conclusion, the LED color temperature control circuit is simple in wiring and high in functionality, the color temperature of the two groups of LED modules can be respectively adjusted through one group of control signals, and the total power of the two groups of load circuits can be kept unchanged due to the fact that only one group of driving power supply is adopted, so that the constant power effect is achieved.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (10)
1. A constant power LED dimming circuit, comprising:
a first light emitting loop;
the second light-emitting loop is connected with the first light-emitting loop in parallel;
a first switch connected in series to the first light-emitting loop;
the second switch is connected in series with the second light-emitting circuit;
the control signal output end is connected with the control end of the first switch;
and the inverting circuit is connected between the control signal output end and the control end of the second switch.
2. The constant-power LED dimming circuit according to claim 1, wherein the inverter circuit comprises:
a first voltage output terminal;
one end of the first resistor is connected with the first voltage output end;
the collector of the first triode is connected with the other end of the first resistor, the emitter of the first triode is grounded, and the base of the first triode is connected with the control signal output end;
and the collector electrode of the first triode is also connected with the control end of the second switch.
3. The constant-power LED dimming circuit according to claim 2, wherein the control signal output terminal is connected to the control terminal of the first switch through a second resistor, and the control signal output terminal is connected to the inverter circuit through the second resistor.
4. The constant-power LED dimming circuit according to claim 2, wherein the first transistor is an NPN transistor.
5. The constant-power LED dimming circuit according to claim 2, wherein the first switch and the second switch are NMOS transistors.
6. The constant-power LED dimming circuit according to claim 1, wherein the inverter circuit comprises:
one end of the third resistor is connected with the control signal output end, and the other end of the third resistor is connected with the control end of the first switch;
the first switch is a second triode, the collector of the second triode is connected with the light-emitting device in the first light-emitting loop, the emitter of the second triode is grounded, and the base of the second triode forms the control end of the first switch;
and the collector electrode of the second triode is also connected with the control end of the second switch.
7. The constant-power LED dimming circuit according to claim 6, wherein the second switch is a third transistor, a base of the third transistor is connected to a collector of the second transistor through a fourth resistor, the collector of the third transistor is connected to the light emitting device in the second light emitting loop, and an emitter of the third transistor is grounded.
8. The constant-power LED dimming circuit according to claim 6, wherein the control signal output terminal is connected to the inverter circuit through a photo-coupling circuit.
9. The constant-power LED dimming circuit according to claim 1, wherein the control signal output terminal outputs a pulse width modulation signal.
10. The constant-power LED dimming circuit according to claim 1, further comprising a rectifying driving device, wherein the rectifying driving device comprises an output terminal, and the first and second light-emitting circuits are connected in parallel between the output terminal of the rectifying driving device and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120519624.XU CN215734939U (en) | 2021-03-11 | 2021-03-11 | Constant-power LED dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120519624.XU CN215734939U (en) | 2021-03-11 | 2021-03-11 | Constant-power LED dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215734939U true CN215734939U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120519624.XU Active CN215734939U (en) | 2021-03-11 | 2021-03-11 | Constant-power LED dimming circuit |
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| Country | Link |
|---|---|
| CN (1) | CN215734939U (en) |
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2021
- 2021-03-11 CN CN202120519624.XU patent/CN215734939U/en active Active
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