CN213186630U

CN213186630U - LED control circuit based on dial-up adjustment

Info

Publication number: CN213186630U
Application number: CN202022069641.6U
Authority: CN
Inventors: 钟小泉; 陈耀显; 林杰忠; 邹伟宏; 陈实
Original assignee: Huizhou Cdn Industrial Development Co ltd
Current assignee: Huizhou Cdn Industrial Development Co ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-05-11
Anticipated expiration: 2030-09-18

Abstract

The utility model relates to a LED control circuit based on dial-up adjustment is applied to in the LED, the circuit includes dial-up circuit, main control chip, first dimmer circuit and second dimmer circuit, main control chip sets up sense terminal, first signal end, second signal end, the sense terminal with dial-up circuit connects, first signal end links to each other with first dimmer circuit, the second signal end is connected with second dimmer circuit. The beneficial effects are that: the method comprises the steps that complementary PWM duty ratio signals are output to a first dimming circuit and a second dimming circuit respectively through a dial circuit, and cold color LEDs and warm color LEDs are adjusted respectively through the first dimming circuit and the second dimming circuit; hardware cost is reduced, and meanwhile, operation experience is improved.

Description

LED control circuit based on dial-up adjustment

Technical Field

The application relates to the technical field of LEDs, in particular to an LED control circuit based on dial-up adjustment.

Background

At present, a DALI dimming/color-modulation LED driving power supply generally adopts two dialing codes to control output power, and one driving can be matched with a plurality of power section lamps. There are two disadvantages, however: 1, two dial switches are needed, so that the cost is wasted, and the competitiveness of the product is influenced; 2. the operation is inconvenient, when needing to adjust luminance and mixing of colors the function, two dial switches need to be stirred simultaneously, complex operation, experience feels poor.

Disclosure of Invention

In order to solve the above technical problems, the present application provides a dial-up adjustment based LED control circuit, which is applied in an LED, the circuit includes a dial-up circuit, a main control chip, a first dimming circuit, and a second dimming circuit,

the main control chip is provided with a detection end, a first signal end and a second signal end, the detection end is connected with the dial circuit, the first signal end is connected with the first dimming circuit, and the second signal end is connected with the second dimming circuit;

the main control chip outputs a first PWM signal to the first dimming circuit and outputs a second PWM signal to the second dimming circuit by receiving a signal of the dial-up circuit, and the sum of the first PWM signal and the second PWM signal is 1.

Optionally, the dialing circuit includes a first dialing circuit and at least one second dialing circuit,

the first dial-up circuit comprises a first resistor and a second resistor, one end of the first resistor is connected with the detection end, the other end of the first resistor is connected with the second resistor, and the other end of the second resistor is connected with a first input power supply;

the second dial circuit comprises a dial switch and a third resistor, one end of the dial switch is connected to the first input power supply, and the other end of the dial switch is connected with the first resistor through the third resistor.

Optionally, the number of the second dialing circuits is 3.

Optionally, a fourth resistor is further connected between the first resistor and the second resistor, and the other end of the fourth resistor is grounded.

Optionally, the first dimming circuit includes a first positive output terminal, a first negative output terminal, a second input power supply, a fifth resistor, a first dimming chip, and a first switch circuit;

the second input power supply is connected with the first positive electrode output end through a fifth resistor; a first signal input end of the first dimming chip is connected to the first signal end, and a first control end of the first dimming chip is connected with the first negative electrode output end through a first switch circuit; the first positive output end and the first negative output end are connected with a first capacitor.

Optionally, the first switch circuit includes a first MOS transistor, a first diode, and a first inductor, a gate of the first MOS transistor is connected to the first control terminal, a drain of the first MOS transistor is connected to the first diode and the first inductor, respectively, and a source of the first MOS transistor is grounded; the other end of the first diode is connected with a second input power supply, and the other end of the first inductor is connected with a first cathode output end.

Optionally, the first sampling end of the first dimming chip is connected to the first positive output end.

Optionally, the second dimming circuit includes a second positive output terminal, a second negative output terminal, a second input power supply, a sixth resistor, a second dimming chip, and a second switching circuit;

the second input power supply is connected with the second anode output end through a sixth resistor; a second signal input end of the second dimming chip is connected to the second signal end, and a second control end of the second dimming chip is connected with the second negative electrode output end through a second switch circuit; and the second positive output end and the second negative output end are connected with a second capacitor.

Optionally, the second switch circuit includes a second MOS transistor, a second diode, and a second inductor, a gate of the second MOS transistor is connected to the second control terminal, a drain of the second MOS transistor is connected to the second diode and the second inductor, and a source of the second MOS transistor is grounded; the other end of the second diode is connected with a second input power supply, and the other end of the second inductor is connected with a second cathode output end.

Optionally, the second sampling terminal of the second dimming chip is connected to the second positive output terminal.

The application relates to a LED control circuit based on dial-up adjustment, its beneficial effect lies in: the method comprises the steps that complementary PWM duty ratio signals are output to a first dimming circuit and a second dimming circuit respectively through a dial circuit, and cold color LEDs and warm color LEDs are adjusted respectively through the first dimming circuit and the second dimming circuit; hardware cost is reduced, and meanwhile, operation experience is improved.

Drawings

Fig. 1 is a schematic circuit diagram according to an embodiment of the present application.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention.

In the embodiment shown in fig. 1, the present application provides an LED control circuit based on dial adjustment, which is applied to an LED, and includes a dial circuit 1, a main control chip U1, a first dimming circuit 2, and a second dimming circuit 3, where the main control chip U1 is provided with a detection terminal U1_ ADC, a first signal terminal U1_ PWM1, and a second signal terminal U1_ PWM2, the detection terminal U1_ ADC is connected to the dial circuit 1, the first signal terminal U1_ PWM1 is connected to the first dimming circuit 2, and the second signal terminal U1_ PWM2 is connected to the second dimming circuit 3; the main control chip U1 outputs a first PWM signal to the first dimming circuit 2 and a second PWM signal to the second dimming circuit 3 by receiving the signal of the dial circuit 1, and the sum of the first PWM signal and the second PWM signal is 1. In this embodiment, the first PWM signal and the second PWM signal are percentage duty ratio signals, and the sum of the first PWM signal and the second PWM signal is equal to 100%. The first dimming circuit 2 may be connected to a warm color LED, and the second dimming circuit 3 may be connected to a cold color LED; according to the power regulation circuit, voltage sampling is carried out through the dial switch SW, then the voltage value is connected to the checking end of the main control chip U1 to carry out detection operation and output corresponding PWM signals, and finally the output PWM signals control output current to complete the power regulation function. The main control chip U1 may be an NDA102EC1 chip or other chips capable of implementing the present technical solution. The main control chip is powered by a first input power supply VDD.

In some embodiments, the dial circuit 1 includes a first dial circuit including a first resistor R1 and a second resistor R2, the first resistor R1 is connected to the detection terminal U1_ ADC at one end, the first resistor R1 is connected to the second resistor R2 at the other end, and the second resistor R2 is connected to the first input power VDD at the other end; the second dial circuit comprises a dial switch SW and a third resistor R3, wherein one end of the dial switch SW is connected to the first input power VDD, and the other end of the dial switch SW is connected with the first resistor R1 through the third resistor R3. The number of second dialing circuits may be 3. A fourth resistor R4 is further connected between the first resistor R1 and the second resistor R2, and the other end of the fourth resistor R4 is grounded. Referring to fig. 1, after power-on, the detection terminal U1_ ADC of the main control chip U1 performs Vsen terminal voltage detection, and outputs 100% PWM signal when Vsen terminal voltage is greater than or equal to 4V, at this time, the output current is the maximum, that is, the output power is also the maximum, and when Vsen terminal voltage is less than 4V, the PWM signal is in linear proportion, and the formula duty (PWM) ═ Vsen/4 × 100% is calculated, so that Vsen terminal voltage value can be changed by dialing, and corresponding PWM signal can be realized, thereby changing output current to complete adjustment of different powers; the voltage value of the detection terminal U1_ ADC is equal to the Vsen terminal voltage value. Each second dial circuit is each dial gear, when the dial switch SW is dialed, the resistor of the dial switch SW is connected in parallel with the second resistor R2, the voltage of the detection end U1_ ADC changes, the main control chip U1 recognizes a corresponding voltage signal through the detection end U1_ ADC, and accordingly outputs a corresponding signal through the first signal end U1_ PWM1 and the second signal end U1_ PWM 2.

In some embodiments, the first dimming circuit 2 includes a first positive output terminal CW +, a first negative output terminal CW-, a second input power VinDC +, a fifth resistor R5, a first dimming chip U2, and a first switching circuit; the second input power supply VinDC + is connected with the first positive output end CW + through a fifth resistor R5; a first signal input end U2_ DIM of the first dimming chip U2 is connected to a first signal end U1_ PWM1, and a first control end U2_ GATE of the first dimming chip U2 is connected with a first negative electrode output end CW-through a first switch circuit; the first positive output terminal CW + and the first negative output terminal CW-are connected to a first capacitor C1. In this embodiment, the first dimming circuit 2 controls the on/off of the first switch circuit through the first dimming chip U2, so as to control the output power connected to the first dimming circuit 2, and the fifth resistor R5 is used for voltage division. The switch circuit comprises a first MOS tube Q1, a first diode D1 and a first inductor L1, wherein the grid electrode of the first MOS tube Q1 is connected to a first control end U2_ GATE, the drain electrode of the first MOS tube Q1 is respectively connected with a first diode D1 and a first inductor L1, and the source electrode of the first MOS tube Q1 is grounded; the other end of the first diode D1 is connected with a second input power supply VinDC +, and the other end of the first inductor L1 is connected with a first negative output end CW-. When the first control terminal U2_ GATE of the first dimming chip U2 outputs a high level signal, the first MOS transistor Q1 is turned on, the first inductor L1 stores energy, the current flowing through the inductor linearly increases while charging the C1, and provides energy to the first positive output terminal CW +, the first negative output terminal CW-, when the first control terminal U2_ GATE of the first dimming chip U2 outputs a low level, the first MOS transistor Q1 is turned off, the L1 is discharged through the freewheeling first diode D1, and the energy when the inductor current linearly decreases is maintained by the first C1. The first sampling terminal U2_ CS of the first dimming chip U2 is connected to the first positive output terminal CW +, and is used for sampling the voltage of the first positive output terminal CW +. A filter capacitor is connected between the first signal input terminal U2_ DIM and the first signal terminal U1_ PWM 1. The first dimming chip U2 may be a chip with model number PT4121E or other chips capable of implementing the present disclosure.

In some embodiments, the second dimming circuit 3 includes a second positive output terminal WW +, a second negative output terminal WW-, a second input power VinDC +, a sixth resistor R6, a second dimming chip U3, and a second switching circuit; the second input power supply VinDC + is connected with the second positive output end WW + through a sixth resistor R6; a second signal input end U3_ DIM of the second dimming chip U3 is connected to a second signal end U1_ PWM2, and a second control end U3_ GATE of the second dimming chip U3 is connected with a second negative electrode output end WW-through a second switching circuit; the second positive output end WW + and the second negative output end WW-are connected with a second capacitor C2. In this embodiment, the second dimming circuit 3 controls the on/off of the second switch circuit through the second dimming chip U3, so as to control the output power connected to the first dimming circuit 2, and the sixth resistor R6 is used for voltage division. The second switch circuit comprises a second MOS tube Q2, a second diode D2 and a second inductor L2, the grid electrode of the second MOS tube Q2 is connected to a second control end U3_ GATE, the drain electrode of the second MOS tube Q2 is connected with a second diode D2 and a second inductor L2 respectively, and the source electrode of the second MOS tube Q2 is grounded; the other end of the second diode D2 is connected with a second input power supply VinDC +, and the other end of the second inductor L2 is connected with a second cathode output end WW-. When the second control terminal U3_ GATE of the second dimming chip U3 outputs a high level signal, the second MOS transistor Q2 is turned on, the second inductor L2 stores energy, the current flowing through the inductor linearly increases, and at the same time, the C2 is charged to provide energy to the second positive output terminal WW +, the second positive output terminal WW-, and when the second control terminal U3_ GATE of the second dimming chip U3 outputs a low level, the second MOS transistor Q2 is turned off, the L2 discharges through the freewheeling second diode D2, and the energy at the moment when the inductor current linearly decreases is maintained by the C1. The second sampling terminal U3_ CS of the second dimming chip U3 is connected to the second positive output terminal WW +, and is configured to sample a voltage of the second positive output terminal WW +. A filter capacitor is connected between the second signal input terminal U3_ DIM and the second signal terminal U1_ PWM 2. The second dimming chip U3 may be a chip with model number PT4121E or other chips capable of implementing the present disclosure.

According to the LED cold-color LED dimming circuit, complementary PWM duty ratio signals are output to the first dimming circuit 2 and the second dimming circuit 3 through one dial circuit respectively, and the cold-color LED and the warm-color LED are adjusted respectively through the first dimming circuit 2 and the second dimming circuit 3; hardware cost is reduced, and meanwhile, operation experience is improved.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.

Claims

1. An LED control circuit based on dial adjustment is characterized in that the LED control circuit is applied to an LED and comprises a dial circuit (1), a main control chip (U1), a first dimming circuit (2) and a second dimming circuit (3);

the main control chip (U1) is provided with a detection end (U1_ ADC), a first signal end (U1_ PWM1) and a second signal end (U1_ PWM2), the detection end (U1_ ADC) is connected with the dial-up circuit (1), the first signal end (U1_ PWM1) is connected with the first dimming circuit (2), and the second signal end (U1_ PWM2) is connected with the second dimming circuit (3);

the main control chip (U1) outputs a first PWM signal to the first dimming circuit (2) and outputs a second PWM signal to the second dimming circuit (3) by receiving a signal of the dial-up circuit (1), and the sum of the first PWM signal and the second PWM signal is 1.

2. Dial-adjustment based LED control circuit according to claim 1, characterized in that the dial circuit (1) comprises a first dial circuit and at least one second dial circuit,

the first dial circuit comprises a first resistor (R1) and a second resistor (R2), one end of the first resistor (R1) is connected with the detection end (U1_ ADC), the other end of the first resistor (R1) is connected with the second resistor (R2), and the other end of the second resistor (R2) is connected with a first input power supply (VDD);

the second dial circuit comprises a dial Switch (SW) and a third resistor (R3), one end of the dial Switch (SW) is connected to the first input power supply (VDD), and the other end of the dial Switch (SW) is connected with the first resistor (R1) through the third resistor (R3).

3. The dial-adjustment based LED control circuit according to claim 2, wherein the number of the second dial-up circuits is 3.

4. The dial-up adjustment based LED control circuit according to claim 2, wherein a fourth resistor (R4) is further connected between the first resistor (R1) and the second resistor (R2), and the other end of the fourth resistor (R4) is grounded.

5. A dial-up based LED control circuit according to claim 1, wherein the first dimming circuit (2) comprises a first positive output terminal (CW +), a first negative output terminal (CW-), a second input power source (VinDC +), a fifth resistor (R5), a first dimming chip (U2), and a first switching circuit;

the second input power supply (VinDC +) is connected with the first positive output end (CW +) through a fifth resistor (R5); a first signal input terminal (U2_ DIM) of the first dimming chip (U2) is connected to the first signal terminal (U1_ PWM1), and a first control terminal (U2_ GATE) of the first dimming chip (U2) is connected to the first negative output terminal (CW-) through a first switch circuit; the first positive electrode output end (CW +) and the first negative electrode output end (CW-) are connected with a first capacitor (C1).

6. The LED control circuit based on dial-up adjustment of claim 5, wherein the first switch circuit comprises a first MOS transistor (Q1), a first diode (D1) and a first inductor (L1), the GATE of the first MOS transistor (Q1) is connected to the first control terminal (U2_ GATE), the drain of the first MOS transistor is connected to the first diode (D1) and the first inductor (L1), the source of the first MOS transistor is grounded; the other end of the first diode (D1) is connected with a second input power supply (VinDC +), and the other end of the first inductor (L1) is connected with a first negative electrode output end (CW-).

7. The dial-up adjustment based LED control circuit according to claim 6, wherein the first sampling terminal (U2_ CS) of the first dimming chip (U2) is connected to the first positive output terminal (CW +).

8. A dial-up adjustment based LED control circuit according to claim 1, wherein the second dimming circuit (3) comprises a second positive output terminal (WW +), a second negative output terminal (WW-), a second input power source (VinDC +), a sixth resistor (R6), a second dimming chip (U3), and a second switching circuit;

the second input power supply (VinDC +) is connected with the second positive electrode output end (WW +) through a sixth resistor (R6); a second signal input end (U3_ DIM) of the second dimming chip (U3) is connected to the second signal end (U1_ PWM2), and a second control end (U3_ GATE) of the second dimming chip (U3) is connected to the second negative output end (WW-) through a second switch circuit; and the second positive electrode output end (WW +) and the second negative electrode output end (WW-) are connected with a second capacitor (C2).

9. The dial-tone-adjustment-based LED control circuit according to claim 8, wherein the second switch circuit comprises a second MOS transistor (Q2), a second diode (D2) and a second inductor (L2), the GATE of the second MOS transistor (Q2) is connected to the second control terminal (U3_ GATE), the drain of the second MOS transistor is connected to the second diode (D2) and the second inductor (L2), the source of the second MOS transistor is grounded; the other end of the second diode (D2) is connected with a second input power supply (VinDC +), and the other end of the second inductor (L2) is connected with a second cathode output end (WW-).

10. The dial-up adjustment based LED control circuit according to claim 9, wherein the second sampling terminal (U3_ CS) of the second dimming chip (U3) is connected to the second positive output terminal (WW +).