CN204498414U - LED online dimming control circuit - Google Patents

Abstract

The utility model discloses an LED online dimming control circuit, which includes: an input end, a rectifier unit, a voltage stabilizing unit, a filtering unit, an MCU controller unit, and a photoelectric coupler circuit unit, a thyristor device, and an output end connected in sequence, wherein the cathode in the thyristor device serves as the L end of the output end, and the MCU controller unit is also connected to an adjustable resistor VR1 with adjustable resistance, and the adjustable resistor VR1 is also connected to the photoelectric coupler circuit unit. The MCU controller unit provides a signal to the photoelectric coupler and the optical isolation triac driver chip according to the resistance value of the adjustable resistor VR1, and the photoelectric coupler cooperates with the optical isolation triac driver chip to control the thyristor device to work, so as to achieve the purpose of dimming the lamp connected to the output end. This method can improve the controllable accuracy and stability, and can also achieve stepless dimming, so that the utility model has extremely high market competitiveness.

Description

LED online dimming control circuit

Technical field:

The utility model relates to the technical field of dimming circuits for LED lamps, in particular to an online dimming control circuit for LEDs.

Background technique:

LED, the abbreviation of Light Emitting Diode, is a light-emitting diode, which is a solid-state semiconductor device that can convert electrical energy into visible light, and it can directly convert electricity into light.

At this stage, under the circumstances of the global pursuit of health, environmental protection and energy crisis, LED lighting has been recognized by the world as an important way of health, energy saving and environmental protection, and its application scope is expanding at a faster speed. Used in lighting decorations, LEDs have the advantages of environmental protection, long life, and low power consumption, making LEDs gradually replace the original small incandescent bulbs and fluorescent lamps. Even so, it is necessary to adjust the brightness of the LED to meet the needs of the environment to further save energy.

The traditional LED dimming circuit cannot dim the LED at any time, and the number of dimming stages can only be two stages, and it is impossible to realize more stages of dimming. The occasion is not applicable.

In view of this, the inventor proposes the following technical solutions.

Utility model content:

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an LED on-line dimming control circuit.

In order to solve the above technical problems, the utility model adopts the following technical scheme: the LED on-line dimming control circuit includes: sequentially connected input terminal, rectifier unit, voltage stabilizing unit, filter unit, MCU controller unit and MCU control The photocoupler circuit unit connected to the device unit, the thyristor device, and the output terminal, wherein the cathode in the thyristor device is used as the L terminal of the output end, and the MCU controller unit is also connected with an adjustable resistance An adjustable resistor VR1, the adjustable resistor VR1 is also connected to the photocoupler circuit unit.

Further, in the above technical solution, the MCU controller unit includes: an MCU controller with 14 pins, the first pin of the MCU controller is connected to the VCC terminal, and is coupled with the filter unit and the photoelectric The circuit unit is connected, the 2nd, 6th, 7th, 10th, 11th, 12th, and 13th are suspended, the 3rd pin is connected to a resistor R6 and the LED and grounded, the 4th pin is connected to a resistor R7 and then connected to the LED cathode, the 5th pin Connect a resistor R8 to the photocoupler circuit unit, the 8th pin is connected to the photocoupler circuit unit, the 9th pin is connected to the adjustment pin in the adjustable resistor VR1, the 9th pin is also connected to a capacitor C7 and grounded, and the 14th pin is connected to the adjustment pin of the adjustable resistor VR1. The foot is grounded.

Further, in the above technical solution, the photocoupler circuit unit includes: an optically isolated triac driver chip and a photocoupler, the optically isolated triac driver chip and the photocoupler The switch pin K1 is connected between the adjustable resistor VR1.

Further, in the above technical solution, the model of the optocoupler is PC817, which has 4 pins, wherein, the first pin is connected to a switch pin K1 of the adjustable resistor VR1 after being connected to an electric group R3, and the second pin is connected to the switch pin K1 of the adjustable resistor VR1. The pin is connected to an electric group R4 and then connected to the N terminal of the output end, the third pin is grounded, and the fourth pin is connected to the MCU controller unit and the VCC end.

Further, in the above technical solution, the model of the optically isolated triac driver chip is MOC3022, which has 6 pins, wherein the first pin is connected to the MCU controller unit, and the second pin is connected to VCC terminal, the 3rd and 5th pins are suspended, the 4th pin is connected to the control pole of the thyristor device, the 6th pin is connected to a resistor R9 and then connected to the anode of the thyristor device and the switch of the adjustable resistor VR1 Foot K1.

Furthermore, in the above technical solution, a fuse F1 is connected between the input end and the rectification unit.

Furthermore, in the above technical solution, a step-down unit is further connected between the input terminal and the rectification unit, and the step-down unit includes a resistor R1 and a capacitor C1 connected in parallel.

Further, in the above technical solution, the rectification unit includes a bridge rectifier.

Furthermore, in the above technical solution, the voltage stabilizing unit includes: an electrolytic capacitor C2, a resistor R2, and a voltage stabilizing diode Z1.

Further, in the above technical solution, the filter unit includes: electrolytic capacitor C3, capacitor C4, and electrolytic capacitor C5 connected in parallel, and the two ends of the electrolytic capacitor C5 are respectively connected to the VCC terminal and the ground.

After adopting the above-mentioned technical scheme, the utility model has the following beneficial effects compared with the prior art: when the utility model works, the rectification unit, the voltage stabilizing unit, and the filter unit convert the mains power input in the input terminal into a power supply for the MCU The direct current used by the controller unit, the MCU controller unit provides signals to the optocoupler and the optically isolated triac driver chip according to the adjustment of the resistance value of the adjustable resistor VR1, and the optocoupler cooperates with the optically isolated triac The terminal bidirectional thyristor driver chip controls the operation of the thyristor device to achieve the purpose of dimming the lamps connected to the output end. Since the photoelectric coupler is used to cooperate with the optically isolated triac driver chip to control the operation of the thyristor device, the controllable precision and stability can be improved, and stepless dimming can also be realized, so that the utility model has extremely high market competitiveness.

Description of drawings:

Fig. 1 is a circuit diagram of the utility model.

Detailed ways:

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further described.

As shown in Figure 1, it is an LED online dimming control circuit, which includes: input terminal 1, rectifier unit 2, voltage stabilization unit 3, filter unit 4, MCU controller unit 5 and MCU controller unit 5 connected in sequence Connected photocoupler circuit unit 6, thyristor device 7, output terminal 8, wherein, the cathode in the said thyristor device 7 is used as the L end of the output end, and the MCU controller unit 5 is also connected with an adjustable The resistance adjustable resistor VR19 is also connected to the photocoupler circuit unit 6.

The input terminal 1 is used to connect to the mains, and the output terminal 8 is connected to the LED lamp.

A fuse F1 is connected between the input terminal 1 and the rectification unit 2 . In addition, a step-down unit 11 is connected between the input terminal 1 and the rectification unit 2, and the step-down unit 11 includes a resistor R1 and a capacitor C1 connected in parallel.

The rectification unit 2 includes a bridge rectifier 21 whose model is MB6S.

The voltage stabilizing unit 3 includes: an electrolytic capacitor C2, a resistor R2, and a voltage stabilizing diode Z1.

The filter unit 4 includes: an electrolytic capacitor C3, a capacitor C4, and an electrolytic capacitor C5 connected in parallel, and the two ends of the electrolytic capacitor C5 are respectively connected to the VCC terminal and the ground.

The MCU controller unit 5 includes: an MCU controller 51 with 14 pins, the first pin of the MCU controller 51 is connected to the VCC end, and is connected with the filter unit 4 and the photocoupler circuit unit 6 , the 2nd, 6th, 7th, 10th, 11th, 12th, and 13th are all suspended, the 3rd pin is connected to a resistor R6 and the LED and grounded, the 4th pin is connected to a resistor R7 and then connected to the LED cathode, the 5th pin is connected to a resistor R8 It is connected to the photocoupler circuit unit 6, the 8th pin is connected to the photocoupler circuit unit 6, the 9th pin is connected to the adjustment pin in the adjustable resistor VR19, the 9th pin is also connected to a capacitor C7 and grounded, and the 14th pin is grounded .

Described optocoupler circuit unit 6 comprises: an optical isolation triac driver chip 61 and a photocoupler 62, described between the optical isolation triac driver chip 61 and the optocoupler 62 The switch pin K1 of the adjustable resistor VR1 is connected.

The model of the photocoupler 62 is PC817, which has 4 pins. Among them, the first pin is connected to the switch pin K1 of the adjustable resistor VR1 after being connected to an electric group R3, and the second pin is connected to an electric group R4 and then connected to The N end of the output end is connected, the third pin is grounded, and the fourth pin is connected to the eighth pin of the MCU controller 51 in the MCU controller unit 5 and the VCC end.

The model of the optically isolated triac driver chip 61 is MOC3022, which has 6 pins, wherein the first pin is connected to the fifth pin and the second pin of the MCU controller 51 in the MCU controller unit 5 Connect to the VCC terminal, the 3rd and 5th pins are suspended, the 4th pin is connected to the control pole in the thyristor device 7, and the 6th pin is connected to a resistor R9 and then connected to the anode and the adjustable resistor in the thyristor device 7 switch pin K1 of device VR1.

The working principle of the utility model is as follows: the rectifying unit 2, the voltage stabilizing unit 3 and the filtering unit 4 transform the mains electricity input in the input terminal 1 into direct current for use by the MCU controller unit 5, and the MCU controller unit 5 adjusts The resistance value of the adjustable resistor VR1 provides signals to the optocoupler 62 and the optically isolated triac driver chip 61, and the optocoupler 62 cooperates with the optically isolated triac driver chip 61 to control the The thyristor device 7 described above works to achieve the purpose of dimming the lamps connected to the output terminal 8 . Owing to adopt optoelectronic coupler 62 to cooperate optical isolation triac driver chip 61 to control described thyristor device 7 to work, can improve controllable precision and stability, also can realize stepless dimming, make the utility model Has a very high market competitiveness.

Of course, the above descriptions are only specific embodiments of the utility model, and are not intended to limit the implementation scope of the utility model. Should be included in the utility model patent scope.

Claims (10)

1. Adjusting control circuit on 1.LED line, it is characterized in that: it comprises: the input (1) connected successively, rectification unit (2), voltage regulation unit (3), filter unit (4), MCU controller unit (5) and the optocoupler circuit unit (6) be connected with MCU controller unit (5), silicon-controlled device (7), output (8), wherein, negative electrode in described silicon-controlled device (7) is held as the L of output, described MCU controller unit (5) is also connected with the adjustable resistor VR1 (9) of adjustable resistance, this adjustable resistor VR1 (9) also connects optocoupler circuit unit (6).
2. 2. adjusting control circuit on LED line according to claim 1, it is characterized in that: described MCU controller unit (5) comprising: a MCU controller (51) with 14 pins, 1st pin of this MCU controller (51) connects VCC end, and be connected with described filter unit (4) and optocoupler circuit unit (6), 2nd, 6, 7, 10, 11, 12, 13 is all unsettled, 3rd pin connects ground connection after resistance R6 and LED, 4th pin is connected with LED negative electrode after connecting a resistance R7, 5th pin connects a resistance R8 and is connected with optocoupler circuit unit (6), 8th pin connects optocoupler circuit unit (6), 9th pin connects the adjustment pin in adjustable resistor VR1 (9), 9th pin also connects ground connection after an electric capacity C7, 14th pin ground connection.
3. 3. adjusting control circuit on LED line according to claim 1, it is characterized in that: described optocoupler circuit unit (6) comprising: light isolation triode ac switch driver chip (61) and a photoelectrical coupler (62), this light isolation triode ac switch driver chip (61) is connected with the switch pin K1 of described adjustable resistor VR1 between photoelectrical coupler (62).
4. 4. adjusting control circuit on LED line according to claim 3, it is characterized in that: described photoelectrical coupler (62) model is PC817, it has 4 pins, wherein, 1st pin is connected with the switch pin K1 of adjustable resistor VR1 after connecting an electricity group R3, hold with the N of described output after 2nd pin connects an electricity group R4 and be connected, the 3rd pin ground connection, the 4th pin connects described MCU controller unit (5) and VCC end.
5. 5. adjusting control circuit on LED line according to claim 3, it is characterized in that: described light isolation triode ac switch driver chip (61) model is MOC3022, it has 6 pins, wherein, 1st pin connects described MCU controller unit (5), 2nd pin connects VCC end, 3rd, 5 pin are unsettled, 4th pin connects the control pole in described silicon-controlled device (7), and the 6th pin connects the switch pin K1 of anode in described silicon-controlled device (7) and adjustable resistor VR1 after connecting a resistance R9.
6. 6. adjusting control circuit on the LED line according to claim 1-5 any one, is characterized in that: be connected with fuse F1 between described input (1) and rectification unit (2).
7. 7. adjusting control circuit on LED line according to claim 6, it is characterized in that: be also connected with pressure unit (11) between described input (1) and rectification unit (2), this pressure unit (11) comprises resistance R1 parallel with one another and electric capacity C1.
8. 8. adjusting control circuit on the LED line according to claim 1-5 any one, is characterized in that: described rectification unit (2) comprises a bridge rectifier (21).
9. 9. adjusting control circuit on the LED line according to claim 1-5 any one, is characterized in that: described voltage regulation unit (3) comprising: electrochemical capacitor C2, resistance R2, voltage stabilizing didoe Z1.
10. 10. adjusting control circuit on the LED line according to claim 1-5 any one, it is characterized in that: described filter unit (4) comprising: electrochemical capacitor C3 parallel with one another, electric capacity C4, electrochemical capacitor C5, this electrochemical capacitor C5 two ends connect VCC end and ground respectively.