CN111163563A - LED control circuit - Google Patents
LED control circuit Download PDFInfo
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- CN111163563A CN111163563A CN202010014113.2A CN202010014113A CN111163563A CN 111163563 A CN111163563 A CN 111163563A CN 202010014113 A CN202010014113 A CN 202010014113A CN 111163563 A CN111163563 A CN 111163563A
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Abstract
The invention discloses an LED control circuit, which comprises a rectifying unit, a constant current filtering unit, a control unit and a plurality of LED groups, wherein each LED group has different color temperatures; two input ends of the rectifying unit are respectively connected to two ends of an alternating current commercial power, and the rectifying unit outputs a direct current signal; the constant current filtering unit is electrically connected with the positive output end of the rectifying unit, and the output end of the constant current filtering unit is electrically connected with the plurality of LED groups to output constant current and constant voltage electric signals for each LED group; the plurality of LED groups are electrically connected with the control unit, and the control unit controls the on-off of each LED group. According to the invention, alternating current commercial power is connected with the LED groups with different color temperatures after passing through the rectifying unit and the constant current filtering unit, so that a better constant current and constant voltage effect can be realized, and the brightness and the luminous stability of the LED are effectively improved; the brightness of each LED group is effectively controlled through the control chip, and the dimming and color mixing functions are realized. The invention has simple circuit structure, low cost and easy realization.
Description
Technical Field
The invention relates to the field of LED (light emitting diode) illumination, in particular to an LED control circuit.
Background
In the technical field of illumination, the LED has the advantages of high luminous efficiency, energy conservation, long service life and the like, and is widely applied to various illumination lamps. Because the LED must be normally started and operated under proper current and voltage, the LED generally needs to be connected with the commercial power after being matched with a driving power supply, and the LED control circuit is used as a converter to convert the power supply into specific voltage and current to control the driving LED to emit light. The LEDs with different color temperatures emit light with different colors, the brightness of the LED with each color temperature is respectively adjusted, and the dimming and color mixing application of the LED combination can be realized, for example, three LEDs of red, green and blue are combined together, the brightness of the LEDs is respectively adjusted, and a full-color LED light-emitting device can be realized.
The existing LED control circuit generally uses a resistor to output constant current, the circuit design is complicated, the constant current and constant voltage effects are poor, the brightness and the luminous stability of the LED are influenced, and the dimming and color mixing of the LED groups with different color temperatures cannot be realized.
Disclosure of Invention
The invention provides an LED control circuit, aiming at overcoming the defects that an LED control circuit in the prior art is poor in constant current and constant voltage effect and cannot realize dimming and color mixing of LED groups with different color temperatures.
The invention solves the technical problems through the following technical scheme:
the invention provides an LED control circuit, which comprises a rectifying unit, a constant current filtering unit, a control unit and a plurality of LED groups, wherein the LED groups have different color temperatures;
two input ends of the rectifying unit are respectively connected to two ends of an alternating current commercial power, and the rectifying unit outputs a direct current signal;
the constant current filtering unit is electrically connected with the positive output end of the rectifying unit, and the output end of the constant current filtering unit is electrically connected with the plurality of LED groups to output constant current and constant voltage electric signals for the plurality of LED groups;
the LED groups are also electrically connected with the control unit, and the control unit controls the connection or disconnection of the LED groups.
Preferably, the constant current filtering unit includes a first constant current diode, a second constant current diode, a third constant current diode, a first capacitor and a second capacitor;
the anode of the first constant current diode is electrically connected with the output end of the rectifying unit, and the first constant current diode, the second constant current diode and the third constant current diode are sequentially connected in series;
one end of the first capacitor is electrically connected with the cathode of the first constant current diode and the anode of the second constant current diode, one end of the second capacitor is electrically connected with the cathode of the second constant current diode and the anode of the third constant current diode, and the capacitor is used as the output end of the constant current filter unit and is electrically connected with the LED groups;
the other end of the first capacitor and the other end of the second capacitor are electrically connected with the negative output end of the rectifying unit.
Preferably, the control unit includes a control chip and a plurality of switches, the plurality of switches are electrically connected to the control chip, and the plurality of switches are further electrically connected to the plurality of LED groups in a one-to-one correspondence.
Preferably, the control chip receives the dimming signal, outputs a plurality of PWM signals to the plurality of switches, and controls the plurality of LED groups to be turned on or off through the plurality of switches, respectively.
Preferably, the switch is a MOS transistor switch.
Preferably, the LED control circuit further includes a protection unit, an input end of the protection unit is electrically connected to one end of the ac mains supply, and an output end of the protection unit is electrically connected to an input end of the rectification unit, and is configured to reduce the current and voltage of the ac mains supply.
Preferably, the protection unit includes a third capacitor and a first resistor, and the third capacitor is connected in parallel with the first resistor;
one end of the third capacitor is electrically connected with one end of the first resistor to serve as an input end of the protection unit, and the other end of the third capacitor is electrically connected with the other end of the first resistor to serve as an output end of the protection unit.
Preferably, the rectifying unit is a bridge rectifying unit.
Preferably, the maximum withstand voltage value of the constant current diode is not less than 50V, and the constant current value of the constant current diode is not less than 8 milliamperes.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: according to the invention, alternating current commercial power is connected with the LED unit group after passing through the rectifying unit and the constant current filtering unit, so that a better constant current and constant voltage effect can be realized, the brightness and the luminous stability of the LED can be effectively improved, and the service life of the LED is also prolonged; the brightness of the LED groups with different color temperatures is effectively controlled through the control chip, and the dimming and color mixing functions are realized. Furthermore, the alternating current commercial power is subjected to current reduction and voltage reduction through the protection unit, so that a subsequent circuit is effectively protected. The invention has simple circuit structure, low cost and easy realization.
Drawings
Fig. 1 is a schematic circuit structure diagram of an LED control circuit according to embodiment 1 of the present invention.
Fig. 2 is a schematic circuit structure diagram of an LED control circuit according to embodiment 2 of the present invention.
Fig. 3 is a schematic diagram of a PWM signal of an LED control circuit according to embodiment 2 of the present invention.
Fig. 4 is a schematic circuit structure diagram of an LED control circuit according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides an LED control circuit, as shown in fig. 1, the LED control circuit includes a rectifying unit 1, a constant current filtering unit 2, a control unit 3, and a plurality of LED groups, and the LED groups have different color temperatures.
Two input ends of the rectifying unit 1 are respectively connected to two ends of an alternating current commercial power, the constant current filtering unit 2 is electrically connected with a positive output end of the rectifying unit 1, an output end of the constant current filtering unit 2 is electrically connected with a plurality of LED groups, and the plurality of LED groups are electrically connected with the control unit 3.
The rectifying unit 1 rectifies alternating current commercial power, outputs a direct current electric signal to the constant current filtering unit 2, and the constant current filtering unit 2 converts the direct current electric signal into a constant current and constant voltage electric signal which is output to the LED groups to provide a constant current and constant voltage driving electric signal for the LED groups.
The control unit 3 controls the on/off of the plurality of LED groups, controls the on time of each LED group to be different, and controls the brightness of each LED group by making the average current flowing through each LED group different, thereby controlling the color emitted by the LED light source formed by the plurality of LEDs and realizing various dimming and toning functions.
According to the embodiment, alternating current commercial power is connected with the plurality of LED groups after passing through the rectifying unit and the constant current filtering unit, so that a good constant current and constant voltage effect can be realized, the brightness and the light emitting stability of the LEDs can be effectively improved, and the service life of the LEDs is also prolonged; the control unit effectively controls the brightness of the LED groups with different color temperatures, and various dimming and color mixing functions are realized.
Example 2
This embodiment is a further refinement of embodiment 1, and as shown in fig. 2, the rectifying unit 1 of the LED control circuit includes a bridge rectifying unit DB; the constant current filtering unit 2 comprises a first constant current diode CRD1, a second constant current diode CRD2, a third constant current diode CRD3, a first capacitor C1 and a second capacitor C2; the control unit 3 includes a control chip 31 and a plurality of switches corresponding to the LED groups one to one.
Several include any number greater than or equal to 2, which is assumed to be 3 here, that is, the present embodiment includes 3 LED groups: first LED group LED1, second LED group LED2, and third LED group LED3, wherein the first LED group LED1 is turned on to emit red light, the second LED group LED2 is turned on to emit green light, and the third LED group LED3 is turned on to emit blue light.
The bridge rectifier unit DB includes 4 diodes, and full-wave rectifies ac mains to convert the ac mains into a dc signal.
In the constant current filter unit 2, the anode of the first constant current diode CRD1 is electrically connected with the output end of the rectifying unit 1.
The first constant current diode CRD1, the second constant current diode CRD2 and the third constant current diode CRD3 are sequentially connected in series; one end of the first capacitor C1 is electrically connected with the cathode of the first constant current diode CRD1 and the anode of the second constant current diode CRD2, one end of the second capacitor C2 is electrically connected with the cathode of the second constant current diode CRD2 and the anode of the third constant current diode CRD3, and is electrically connected with the 3 LED groups as the output end of the constant current filter unit 2.
The other end of the first capacitor C1 and the other end of the second capacitor C2 are electrically connected with the negative output end of the rectifying unit 1.
The constant current diode belongs to a constant current device at two ends, a constant current area exists when the constant current diode works in the forward direction, and the current in the area hardly changes along with the change of voltage. In the embodiment, three constant current diodes are used as a main body for constant current, and meanwhile, in combination with the first capacitor C1 and the second capacitor C2, the front-end constant current diode may not always work in a constant current region due to voltage fluctuation, so that charges are stored through the capacitors, when the front-end constant current diode is not in the constant current region, the potential at the capacitors is higher, and the rear-end constant current diode is ensured to always work in the constant current region, so that the output current is constant. The three constant current diodes and the two capacitors jointly form a filter circuit, and even if power supply of power voltage is unstable or load resistance changes greatly, the LED control circuit of the embodiment can ensure constant output current. The LED control circuit has constant output current, so that the LED has high brightness and stable light emission, the flicker frequency is reduced, and the service life of the LED is prolonged.
The control unit 3 includes a first switch S1, a second switch S2, and a third switch S3, which are respectively connected in series with the first LED group LED1, the second LED group LED2, and the third LED group LED3 in a one-to-one correspondence, and 3 switches are electrically connected to the control chip 31. The three LED groups in the LED control circuit are connected in parallel.
The control chip 31 receives a dimming signal sent by a user, generates 3 PWM signals according to the dimming signal and a preset operating frequency f, and outputs the 3 PWM signals to the first switch S1, the second switch S2, and the third switch S3, respectively, so as to control the on/off of the 3 LED groups through the 3 switches. As shown in fig. 3, the 3 PWM signals have the same period T (T ═ 1/f), and the high level signals differ in time and position in the period.
The control chip 31 firstly controls the first switch S1 to be turned on for t1 time, and simultaneously the second switch S2 and the third switch S3 are turned off, that is, the first LED group LED1 is turned on for t1 time, and the second LED group LED2 and the third LED group LED3 are turned off; the second switch S2 is controlled to be switched on for t2 time, and simultaneously the first switch S1 and the third switch S3 are switched off, namely the second LED group LED2 in the circuit is switched on for t2 time, and the first LED group LED1 and the third LED group LED3 are switched off; the third switch S3 is controlled to be switched on for t3 time, and simultaneously the first switch S1 and the second switch S2 are switched off, namely the third LED group LED3 in the circuit is switched on for t3 time, and the first LED group LED1 and the second LED group LED2 are switched off; and finally, the three switches are controlled to be turned off for t4 time, namely, the first LED group LED1, the second LED group LED2 and the third LED group LED3 in the circuit are all turned off for t4 time. The time of the 3 PWM signals satisfies the following formula:
T＝1/f＝t1+t2+t3+t4
the time of t1, t2, t3 and t4 can be changed by changing 3 PWM signals according to the dimming signal sent by a user, so that the on or off of each LED group is controlled; if the control working frequency f is large enough, if the control working frequency f is not less than 200 Hz, human eyes cannot find the flicker of each LED group, and therefore discomfort cannot be caused. Therefore, the light emitting time of the red light, the green light and the blue light in one period can be adjusted only by adjusting t1, t2 and t3, so that the light emitting color visible to naked eyes can be adjusted; and the light-emitting brightness can be adjusted by adjusting t 4. When each switch is turned on, the other two switches are turned off, that is, only one LED group emits light in the LED light emitting unit at most, so that the operating current and voltage of each LED group are substantially unchanged due to the existence of the rectifying unit 1 and the constant current filter circuit 2, and the stability of the light emitting performance can be realized. The LED control circuit of the embodiment can well perform dimming and color mixing of various functions according to the control of a user, meanwhile, the LED group is stable in light emitting, human eyes cannot feel flickering of the LED group, and the light emitting performance of the LED light source is greatly improved.
In a specific implementation, the number of the LED groups and the number of the switches may be other suitable numbers, and the LED groups may also be different light sources such as cool white light, warm white light, and the like. The control chip 31 can be an existing single chip or other integrated circuits with control functions, the control chip 31 can be connected with the infrared module, a user can send a dimming signal through a remote controller, the dimming signal is received by the infrared module and then transmitted to the control chip 31, and then a corresponding PWM signal is generated to control the light emitting performance of the LED group. The switch may be a MOS transistor switch or other switching element.
According to the embodiment, alternating current commercial power is connected with the plurality of LED groups after passing through the rectifying unit and the constant current filtering unit, so that a good constant current and constant voltage effect can be realized, the brightness and the light emitting stability of the LEDs can be effectively improved, and the service life of the LEDs is also prolonged; the control chip in the control unit receives dimming signals of a user, generates PWM signals to effectively control the brightness of the LED groups with different color temperatures, and achieves multiple dimming and color mixing functions.
Example 3
The present embodiment is further optimized on the basis of embodiment 1 or 2, and as shown in fig. 4, the LED driving circuit further includes a protection circuit 4 for performing a current reduction and voltage reduction on the ac mains supply. In this embodiment, the rectifying unit 1, the constant current filtering unit 2 and the control unit 3 are the same as those in embodiment 2, and are not described herein again.
The protection unit 4 comprises a third capacitor C3 and a first resistor R1 which are connected in parallel, one end of the third capacitor C3 is electrically connected with one end of the first resistor R1, the third capacitor C3 is electrically connected with the other end of the first resistor R1 as the input end of the protection unit 4, and the third capacitor C3 is electrically connected with one input end of the rectification unit 1 as the output end of the protection unit 4.
The third capacitor C3 is connected in series with a power supply loop of the alternating current mains supply, and can absorb the overvoltage of the alternating current mains supply in a peak state and prevent voltage mutation; the first resistor R1 connected in parallel with the third capacitor C3 can absorb the power of the third capacitor C3 to prevent the discharge current of the third capacitor C3 from being too large. Therefore, the protection circuit 4 can perform current reduction and voltage reduction on the alternating current commercial power and plays a role in protecting subsequent circuits.
Alternating current commercial power is through the protection unit in this embodiment and is fallen the class and step down, then connects the LED unit group behind bridge rectifier unit and the constant current filter unit, can realize constant current constant voltage effect better, effectively improves LED's luminance and luminous stability, has also improved LED's life-span.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. The LED control circuit is characterized by comprising a rectifying unit, a constant current filtering unit, a control unit and a plurality of LED groups, wherein the LED groups have different color temperatures;
two input ends of the rectifying unit are respectively connected to two ends of an alternating current commercial power, and the rectifying unit outputs a direct current signal;
the constant current filtering unit is electrically connected with the positive output end of the rectifying unit, and the output end of the constant current filtering unit is electrically connected with the plurality of LED groups to output constant current and constant voltage electric signals for the plurality of LED groups;
the LED groups are also electrically connected with the control unit, and the control unit controls the connection or disconnection of the LED groups.
2. The LED control circuit according to claim 1, wherein the constant current filter unit includes a first constant current diode, a second constant current diode, a third constant current diode, a first capacitor, and a second capacitor;
the anode of the first constant current diode is electrically connected with the output end of the rectifying unit, and the first constant current diode, the second constant current diode and the third constant current diode are sequentially connected in series;
one end of the first capacitor is electrically connected with the cathode of the first constant current diode and the anode of the second constant current diode, one end of the second capacitor is electrically connected with the cathode of the second constant current diode and the anode of the third constant current diode, and the capacitor is used as the output end of the constant current filter unit and is electrically connected with the LED groups;
the other end of the first capacitor and the other end of the second capacitor are electrically connected with the negative output end of the rectifying unit.
3. The LED control circuit of claim 1, wherein said control unit comprises a control chip and a plurality of switches, said plurality of switches being electrically connected to said control chip, said plurality of switches being further electrically connected to said plurality of LED groups in a one-to-one correspondence.
4. The LED control circuit of claim 3, wherein the control chip receives a dimming signal, outputs a plurality of PWM signals to the plurality of switches, and controls the plurality of LED groups to be turned on or off through the plurality of switches, respectively.
5. The LED control circuit of claim 3, wherein the switch is a MOS transistor switch.
6. The LED control circuit of claim 1, further comprising a protection unit, wherein an input end of the protection unit is electrically connected to one end of the ac mains, and an output end of the protection unit is electrically connected to one input end of the rectification unit, for reducing the ac mains voltage.
7. The LED control circuit of claim 5, wherein the protection unit comprises a third capacitor and a first resistor, the third capacitor being connected in parallel with the first resistor;
one end of the third capacitor is electrically connected with one end of the first resistor to serve as an input end of the protection unit, and the other end of the third capacitor is electrically connected with the other end of the first resistor to serve as an output end of the protection unit.
8. The LED control circuit of claim 1 wherein the rectifying unit is a bridge rectifying unit.
9. The LED control circuit according to claim 2, wherein the maximum withstand voltage value of the constant current diode is not less than 50V, and the constant current value of the constant current diode is not less than 8 ma.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014113.2A CN111163563A (en) | 2020-01-07 | 2020-01-07 | LED control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010014113.2A CN111163563A (en) | 2020-01-07 | 2020-01-07 | LED control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114258170A (en) * | 2021-11-29 | 2022-03-29 | 中山市特新电子科技有限公司 | Lamp control device, color temperature controllable lamp and data transmission method |
| CN114258170B (en) * | 2021-11-29 | 2024-04-19 | 中山市特新电子科技有限公司 | Lamp control device, color temperature-controllable lamp and data transmission method |
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