A color temperature adjusting circuit and driving device based on a dial switch

Abstract

The utility model relates to a kind of color temperature adjusting circuit and driving device based on dial switch, comprising: linear step-down power supply module, switch module, constant-current drive module and LED lamp panel;LED lamp panel includes: first group color temperature LED lamp string and second group LED color temperature lamp string;The anode of first group color temperature LED lamp string and the anode of second group LED color temperature lamp string are connected with the positive output end of drive power supply, the cathode of first group color temperature LED lamp string is connected with one end of switch module, the cathode of second group color temperature LED lamp string is connected with the other end of switch module, switch module is also connected in the negative output end of drive power supply, the input end of linear step-down power supply module is connected with the positive output end of drive power supply, the output end of linear step-down power supply module is connected with the power supply end of constant-current drive module, constant-current drive module is also connected with switch module.The utility model makes lamp string work in linear mode by linear constant-current regulation, both can achieve the purpose of adjusting color temperature, and can avoid flicker phenomenon, effectively improve user experience.

Description

Technical Field

[0001] This utility model relates to the technical field of color temperature adjustment for lamps, and more specifically, to a color temperature adjustment circuit and driving device based on a DIP switch. Background Technology

[0002] Adjustable color temperature LED lights use two different color temperature LED beads connected in parallel, such as a warm color temperature LED bead string (3K color temperature) and a cool color temperature LED bead string (5K color temperature). By adjusting the current ratio of the two LED bead strings, different color temperature lighting effects can be achieved.

[0003] Commonly used LED color temperature adjustment circuits adjust the duty cycle of two strings of LEDs by using PWM signals to adjust the current ratio of the two strings of LEDs. Because it is a PWM adjustment method, the LED strings will flicker when working in bright and dark modes, which will affect the user experience. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a color temperature adjustment circuit and driving device based on a DIP switch.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a color temperature adjustment circuit based on a DIP switch, including: a linear step-down power supply module, a switch module, a constant current drive module, and an LED light board;

[0006] The LED light panel includes: a first set of color temperature LED light strings and a second set of color temperature LED light strings;

[0007] The positive terminals of the first and second sets of LED color temperature light strings are connected to the positive output terminal of the driving power supply. The negative terminal of the first set of LED color temperature light strings is connected to one end of the switching module, and the negative terminal of the second set of LED color temperature light strings is connected to the other end of the switching module. The switching module is also connected to the negative output terminal of the driving power supply. The input terminal of the linear buck power supply module is connected to the positive output terminal of the driving power supply, and the output terminal of the linear buck power supply module is connected to the power supply terminal of the constant current driving module. The constant current driving module is also connected to the switching module.

[0008] In the color temperature adjustment circuit based on a DIP switch described in this utility model, the switch module includes a DIP switch; the DIP switch includes multiple positions, each position being used to adjust the color temperature of the first group of color temperature LED strings and the second group of color temperature LED strings.

[0009] In the color temperature adjustment circuit based on a DIP switch described in this utility model, the switch module includes a DIP switch; the DIP switch includes a first position, a second position, a third position, a fourth position, and a fifth position.

[0010] The DIP switch includes: a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, and a twelfth pin;

[0011] The first pin and the second pin are connected, and the eleventh pin and the twelfth pin are connected to form the first gear position;

[0012] The second pin and the third pin are connected, and the eleventh pin and the tenth pin are connected to form the second gear position;

[0013] The third pin and the fourth pin are connected, and the tenth pin and the ninth pin are connected to form the third gear position;

[0014] The fourth pin and the fifth pin are connected, and the ninth pin and the eighth pin are connected to form the fourth gear position;

[0015] The fifth pin and the sixth pin are connected, and the eighth pin and the seventh pin are connected to form the fifth gear position.

[0016] In the color temperature adjustment circuit based on a DIP switch described in this utility model, the negative terminal of the first set of color temperature LED strings is connected to the eleventh and ninth pins of the DIP switch, and the negative terminal of the second set of color temperature LED strings is connected to the third and fifth pins of the DIP switch.

[0017] The twelfth and tenth pins of the DIP switch are both connected to the negative output terminal of the drive power supply, the second and eighth pins of the DIP switch are both connected to the constant current drive module, and the fourth and sixth pins of the DIP switch are grounded.

[0018] In the color temperature adjustment circuit based on DIP switch described in this utility model, when the DIP switch is set to the first position, the current flowing through the first set of color temperature LED strings is equal to the current output from the positive output terminal of the driving power supply, and the current flowing through the second set of color temperature LED strings is 0.

[0019] The ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 75%, and the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 25%.

[0020] The ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 50%, and the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 50%.

[0021] The ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 25%, and the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driving power supply is 75%.

[0022] The current flowing through the first set of color temperature LED strings is 0, which is equal to the current output from the positive output terminal of the driving power supply. The current flowing through the second set of color temperature LED strings is equal to the current output from the positive output terminal of the driving power supply.

[0023] In the color temperature adjustment circuit based on DIP switch described in this utility model, the linear step-down power supply module includes: a power supply circuit and a filter circuit;

[0024] The input terminal of the power supply circuit is connected to the positive output terminal of the drive power supply, and the output terminal of the power supply circuit is connected to the power supply terminals of the filter circuit and the constant current drive module.

[0025] In the color temperature adjustment circuit based on DIP switch described in this utility model, the power supply circuit includes: a first resistor, a second resistor, a first transistor, and a second Zener diode;

[0026] The second end of the first resistor and the second end of the second resistor are connected to the positive output terminal of the driving power supply. The first end of the first resistor is connected to the base of the first transistor and the cathode of the second Zener diode. The anode of the second Zener diode is grounded. The collector of the first transistor is connected to the first end of the second resistor. The emitter of the first transistor is connected to the power supply terminal of the constant current driving module.

[0027] In the color temperature adjustment circuit based on DIP switch described in this utility model, the filter circuit includes: a first capacitor;

[0028] The first terminal of the first capacitor is connected to the emitter of the first transistor, and the second terminal of the first capacitor is grounded.

[0029] In the color temperature adjustment circuit based on DIP switch described in this utility model, the constant current driving module includes: a constant current driver;

[0030] The third terminal of the constant current driver is connected to the output terminal of the linear buck power supply module as the power supply terminal of the constant current driver module. The second terminal of the constant current driver is grounded, and the first terminal of the constant current driver is connected to the second and eighth pins of the DIP switch.

[0031] This utility model also provides a driving device, including: the color temperature adjustment circuit based on the DIP switch described above.

[0032] The color temperature adjustment circuit and driving device based on a DIP switch of this utility model have the following beneficial effects: It includes a linear step-down power supply module, a switching module, a constant current driving module, and an LED light board. The LED light board includes a first set of color temperature LED strings and a second set of color temperature LED strings. The positive terminals of the first and second sets of color temperature LED strings are connected to the positive output terminal of the driving power supply. The negative terminal of the first set of color temperature LED strings is connected to one end of the switching module, and the negative terminal of the second set of color temperature LED strings is connected to the other end of the switching module. The switching module is also connected to the negative output terminal of the driving power supply. The input terminal of the linear step-down power supply module is connected to the positive output terminal of the driving power supply, and the output terminal of the linear step-down power supply module is connected to the power supply terminal of the constant current driving module. The constant current driving module is also connected to the switching module. This utility model, through linear constant current adjustment, enables the LED strings to operate in linear mode, achieving both color temperature adjustment and avoiding flicker, effectively improving the user experience. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the color temperature adjustment circuit based on a DIP switch provided by this utility model;

[0035] Figure 2 This is a circuit diagram of the linear step-down power supply module and constant current drive module provided by this utility model. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Figure 1 The color temperature adjustment circuit based on a DIP switch provided by this utility model is shown.

[0038] like Figure 1 As shown, the color temperature adjustment circuit includes: a linear step-down power supply module 10, a switching module 20, a constant current drive module 30, and an LED light board 40. The LED light board 40 includes: a first set of color temperature LED strings and a second set of color temperature LED strings. The first set of color temperature LED strings can be cool color temperature strings (i.e., 5K color temperature), and the second set of color temperature LED strings can be warm color temperature strings (i.e., 3K color temperature).

[0039] like Figure 1As shown, in this embodiment, the positive terminal (LED1+) of the first set of color temperature LED strings and the positive terminal (LED2+) of the second set of color temperature LED strings are connected to the positive output terminal of the driving power supply. The negative terminal (LED1-) of the first set of color temperature LED strings is connected to one end of the switching module 20, and the negative terminal (LED2-) of the second set of color temperature LED strings is connected to the other end of the switching module 20. The switching module 20 is also connected to the negative output terminal of the driving power supply. The input terminal of the linear buck power supply module 10 is connected to the positive output terminal of the driving power supply, and the output terminal of the linear buck power supply module 10 is connected to the power supply terminal of the constant current driving module 30. The constant current driving module 30 is also connected to the switching module 20. In this embodiment, the driving power supply can be an LED constant current driving power supply, which can be any existing LED constant current driving power supply. This utility model does not make any specific limitation. The positive output terminal of the LED constant current driving power supply is LED+, and the negative output terminal of the LED constant current driving power supply is LED-.

[0040] In this embodiment, the linear step-down power supply module 10 includes a power supply circuit and a filter circuit; the input terminal of the power supply circuit is connected to the positive output terminal of the drive power supply, and the output terminal of the power supply circuit is connected to the power supply terminal of the filter circuit and the constant current drive module 30.

[0041] In this embodiment, the switch module 20 can be a DIP switch SW1. The DIP switch SW1 includes multiple positions, each used to adjust the color temperature of the first and second color temperature LED strings. Specifically, in this embodiment, when the user operates any position of the DIP switch SW1, the corresponding circuit is connected, thereby realizing the adjustment of the color temperature of the first and second color temperature LED strings.

[0042] In a preferred embodiment, such as Figure 1 As shown, the DIP switch SW1 is a dual-row DIP switch SW1 (e.g., Figure 1 The DIP switch SW1 includes five positions: first position, second position, third position, fourth position, and fifth position. The DIP switch SW1 includes the following pins: first pin (Pin1), second pin (Pin2), third pin (Pin3), fourth pin (Pin4), fifth pin (Pin5), sixth pin (Pin6), seventh pin (Pin7), eighth pin (Pin8), ninth pin (Pin9), tenth pin (Pin10), eleventh pin (Pin11), and twelfth pin (Pin12).

[0043] In this embodiment, the first and second pins are connected, and the eleventh and twelfth pins are connected to form the first gear position. Specifically, in this embodiment, the first and second pins of the DIP switch SW1 are shorted internally (e.g., the two pins are connected together internally by a wire), and the eleventh and twelfth pins of the DIP switch SW1 are shorted internally.

[0044] The second and third pins are connected, and the eleventh and tenth pins are connected to form the second position. Specifically, in this embodiment, the second and third pins of the DIP switch SW1 are shorted internally, and the eleventh and tenth pins of the DIP switch SW1 are shorted internally.

[0045] The third and fourth pins are connected, and the tenth and ninth pins are connected to form the third position. Specifically, in this embodiment, the third and fourth pins of the DIP switch SW1 are shorted internally, and the tenth and ninth pins of the DIP switch SW1 are shorted internally.

[0046] The fourth and fifth pins are connected, and the ninth and eighth pins are connected to form the fourth position. Specifically, in this embodiment, the fourth and fifth pins of the DIP switch SW1 are shorted internally, and the ninth and eighth pins of the DIP switch SW1 are also shorted internally.

[0047] Pins 5 and 6 are connected, and pins 8 and 7 are connected to form the fifth position. Specifically, in this embodiment, pins 5 and 6 of the DIP switch SW1 are shorted internally, and pins 8 and 7 of the DIP switch SW1 are also shorted internally.

[0048] Specifically, such as Figure 1 As shown, in this embodiment, the negative electrode of the first group of color temperature LED strings (such as...) Figure 1 LED1-) connects to pins 11 and 9 of DIP switch SW1, and is the negative terminal of the second group of color temperature LED strings (e.g., Figure 1 LED2-) is connected to the third and fifth pins of DIP switch SW1; the twelfth and tenth pins of DIP switch SW1 are both connected to the negative output terminal of the drive power supply; the second and eighth pins of DIP switch SW1 are both connected to the constant current drive module 30; and the fourth and sixth pins of DIP switch SW1 are grounded.

[0049] Specifically, such as Figure 2As shown, in this embodiment, the power supply circuit includes: a first resistor R1, a second resistor R2, a first transistor Q1, and a second Zener diode DZ2; the second end of the first resistor R1 and the second end of the second resistor R2 are connected to the positive output terminal of the driving power supply, the first end of the first resistor R1 is connected to the base of the first transistor Q1 and the cathode of the second Zener diode DZ2, the anode of the second Zener diode DZ2 is grounded, the collector of the first transistor Q1 is connected to the first end of the second resistor R2, and the emitter of the first transistor Q1 is connected to the power supply terminal of the constant current driving module 30.

[0050] In this embodiment, as Figure 2 As shown, the filter circuit includes: a first capacitor C1; the first end of the first capacitor C1 is connected to the emitter of the first transistor Q1, and the second end of the first capacitor C1 is grounded.

[0051] In this embodiment, as Figure 2 As shown, the constant current drive module 30 includes: a constant current driver U1; the third terminal of the constant current driver U1 is connected to the output terminal of the linear step-down power supply module 10 (i.e., the emitter of the first transistor Q1) as the power supply terminal of the constant current drive module 30; the second terminal of the constant current driver U1 is grounded; and the first terminal of the constant current driver U1 is connected to the second and eighth pins of the DIP switch SW1.

[0052] Optionally, in this embodiment, the constant current driver U1 is a low-voltage, low-current (25% of the total output current) constant current circuit, which shares this constant current source when the DIP switch SW1 is in the second and fourth positions.

[0053] Specifically, such as Figure 2 As shown, the first resistor R1, the second resistor R2, the first transistor Q1, the second Zener diode DZ2, and the first capacitor C1 power the constant current driver U1. The first Zener diode is for protection. The constant current driver U1 can use ICs with different current ranges to suit different current magnitudes. For example, when the total output current is 1A, the constant current driver U1 can be an OC7135E25, 250m, to achieve the required 25%I current.

[0054] In this embodiment, when the DIP switch SW1 is in the first position, the current flowing through the first set of color temperature LED strings is equal to the current output from the positive output terminal of the driver power supply, and the current flowing through the second set of color temperature LED strings is 0; the ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 75%, the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 25%, and the ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 5. 0%, the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 50%; the ratio of the current flowing through the first set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 25%, and the ratio of the current flowing through the second set of color temperature LED strings to the current output from the positive output terminal of the driver power supply is 75%; the current flowing through the first set of color temperature LED strings is 0, which is equal to the current output from the positive output terminal of the driver power supply, and the current flowing through the second set of color temperature LED strings is equal to the current output from the positive output terminal of the driver power supply.

[0055] Specifically, in this embodiment, as Figure 1 As shown, when the DIP switch SW1 is set to position 1 (first position), Pin1 and Pin2 are shorted, and Pin11 and Pin12 are shorted. The cool-toned LED string LED1 is connected to SW1 Pin11, Pin11 is shorted, and Pin12 is grounded. The negative terminal of the warm-toned LED string LED2 is left floating, and the current is 0.5K. The current of the 0.5K LED string is equal to 100% I, and the color temperature of the LED is a cool 5K color temperature.

[0056] When DIP switch SW1 is set to position 2 (second position), Pin 2 and Pin 3 are shorted, and Pin 11 and Pin 10 are shorted. For the cool-toned LED string, LED1 is connected to SW1 Pin 11, Pin 11 is shorted, and Pin 10 is grounded. For the warm-toned LED string, the negative terminal is connected to Pin 3, and Pin 2 and Pin 3 are shorted. This is connected to a constant current source. The constant current source current is set to 25%I. The current for a 5K LED string is equal to 100%I - 25%I = 75%I, resulting in a color temperature of 4.5K.

[0057] When the DIP switch SW1 is set to position 3 (third position), pins 3 and 4 are shorted, and pins 10 and 9 are shorted. For the cool-toned LED string, LED1 is connected to pin 9 of SW1, pin 9 is shorted, and pin 10 is grounded. For the warm-toned LED string, the negative terminal is connected to pin 3, pins 3 and 4 are shorted, and then grounded. The 5K LED string and the 3K LED string are connected in parallel to ground, with the current evenly distributed (50% each), resulting in a 4K color temperature.

[0058] When DIP switch SW1 is set to position 4 (fourth position), pins 4 and 5 are shorted, and pins 9 and 8 are shorted. For the cool-toned LED string, connect to pin 9 of SW1, shorting pin 8, and connect to a constant current source. Set the constant current source current to 25%I. For the warm-toned LED string, connect the negative terminal to pin 5, shorting pins 5 and 4. The current for the warm-toned 3K LED string is equal to 100%I - 25%I = 75%I, resulting in a color temperature of 3.5K.

[0059] When DIP switch SW1 is set to position 5 (fifth position), pins 5 and 6 are shorted, and pins 8 and 7 are shorted. LED1 (cool-toned LED string) is left floating, with zero current. LED2 (warm-toned LED string) has its negative terminal connected to pin 5, and pins 5 and 6 are shorted to ground. The current in the 3K LED string is equal to 100% I, resulting in a warm 3K color temperature.

[0060] It should be noted that, Figure 1 The implementation with 5 positions is shown. In other embodiments, the DIP switch SW1 can also adopt a multi-position structure, such as 4 positions or 6 positions. In addition, the DIP switch SW1 is not limited to the short-circuiting of adjacent pins. Other methods can also be used, such as shorting Pin1 and Pin3 inside the DIP switch SW1, or shorting Pin11 and Pin10 inside the DIP switch SW1.

[0061] This invention achieves linear constant current adjustment of color temperature through DIP switch SW1, enabling the light string to work in linear mode, effectively avoiding flickering. Moreover, the circuit structure is simple and cost-effective, and it does not use MCU or MOSFET, reducing the complexity of linear adjustment and making it more economical.

[0062] This utility model also provides a driving device, including: the color temperature adjustment circuit based on a DIP switch disclosed in the embodiments of this utility model. The driving device may include, but is not limited to, an LED driver power supply.

[0063] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They do not limit the scope of protection of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the scope of the claims of this utility model.

Claims

1. A color temperature adjustment circuit based on a DIP switch, characterized in that, include: Linear step-down power supply module, switching module, constant current drive module, and LED light board; The LED light panel includes: a first set of color temperature LED light strings and a second set of color temperature LED light strings; The positive terminals of the first and second sets of LED color temperature light strings are connected to the positive output terminal of the driving power supply. The negative terminal of the first set of LED color temperature light strings is connected to one end of the switching module, and the negative terminal of the second set of LED color temperature light strings is connected to the other end of the switching module. The switching module is also connected to the negative output terminal of the driving power supply. The input terminal of the linear buck power supply module is connected to the positive output terminal of the driving power supply, and the output terminal of the linear buck power supply module is connected to the power supply terminal of the constant current driving module. The constant current driving module is also connected to the switching module.

2. The color temperature adjustment circuit based on a DIP switch according to claim 1, characterized in that, The switching module includes a DIP switch; the DIP switch has multiple positions, each position being used to adjust the color temperature of the first group of color temperature LED strings and the second group of color temperature LED strings.

3. The color temperature adjustment circuit based on a DIP switch according to claim 1, characterized in that, The switch module includes a DIP switch; the DIP switch includes a first position, a second position, a third position, a fourth position, and a fifth position. The DIP switch includes: a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin, an eighth pin, a ninth pin, a tenth pin, an eleventh pin, and a twelfth pin; The first pin and the second pin are connected, and the eleventh pin and the twelfth pin are connected to form the first gear position; The second pin and the third pin are connected, and the eleventh pin and the tenth pin are connected to form the second gear position; The third pin and the fourth pin are connected, and the tenth pin and the ninth pin are connected to form the third gear position; The fourth pin and the fifth pin are connected, and the ninth pin and the eighth pin are connected to form the fourth gear position; The fifth pin and the sixth pin are connected, and the eighth pin and the seventh pin are connected to form the fifth gear position.

4. The color temperature adjustment circuit based on a DIP switch according to claim 3, characterized in that, The negative terminal of the first set of color temperature LED strings is connected to the eleventh and ninth pins of the DIP switch, and the negative terminal of the second set of color temperature LED strings is connected to the third and fifth pins of the DIP switch. The twelfth and tenth pins of the DIP switch are both connected to the negative output terminal of the drive power supply, the second and eighth pins of the DIP switch are both connected to the constant current drive module, and the fourth and sixth pins of the DIP switch are grounded.

5. The color temperature adjustment circuit based on a DIP switch according to claim 1, characterized in that, The linear step-down power supply module includes: a power supply circuit and a filter circuit; The input terminal of the power supply circuit is connected to the positive output terminal of the drive power supply, and the output terminal of the power supply circuit is connected to the power supply terminals of the filter circuit and the constant current drive module.

6. The color temperature adjustment circuit based on a DIP switch according to claim 5, characterized in that, The power supply circuit includes: a first resistor, a second resistor, a first transistor, and a second Zener diode; The second end of the first resistor and the second end of the second resistor are connected to the positive output terminal of the driving power supply. The first end of the first resistor is connected to the base of the first transistor and the cathode of the second Zener diode. The anode of the second Zener diode is grounded. The collector of the first transistor is connected to the first end of the second resistor. The emitter of the first transistor is connected to the power supply terminal of the constant current driving module.

7. The color temperature adjustment circuit based on a DIP switch according to claim 6, characterized in that, The filter circuit includes: a first capacitor; The first terminal of the first capacitor is connected to the emitter of the first transistor, and the second terminal of the first capacitor is grounded.

8. The color temperature adjustment circuit based on a DIP switch according to claim 3, characterized in that, The constant current drive module includes: a constant current driver; The third terminal of the constant current driver is connected to the output terminal of the linear buck power supply module as the power supply terminal of the constant current driver module. The second terminal of the constant current driver is grounded, and the first terminal of the constant current driver is connected to the second and eighth pins of the DIP switch.

9. A driving device, characterized in that, include: The color temperature adjustment circuit based on a DIP switch as described in any one of claims 1-8.

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