Constant-voltage adjustable LED driving controller

Abstract

The utility model discloses a constant-voltage adjustable LED driving controller, which relates to the field of LED driving and comprises a working power utilization module used for providing working voltage for a triangular wave output module and an output voltage adjusting module; the triangular wave output module is used for outputting triangular waves to the output voltage adjusting module; the output voltage adjusting module is used for adjusting the conduction state of the voltage output module and changing the magnitude of the output voltage; the voltage output module is used for outputting constant-voltage direct current to the LED, and the LED emits light and illuminates; the working power utilization module is connected with the triangular wave output module and the output voltage regulation module, and compared with the prior art, the LED driving power supply has the beneficial effects that the duty ratio of a PWM (Pulse Width Modulation) signal output to the voltage output module is regulated through the output voltage regulation module, so that the voltage of the voltage output module is changed, and the stepless regulation of the LED voltage is realized.

Description

Technical Field

[0001] The utility model relates to the field of LED driving, in particular to a constant voltage adjustable LED driving controller. Background Art

[0002] In recent years, high-brightness LED lighting is gradually replacing traditional light sources such as incandescent lamps and fluorescent lamps with advantages such as high light efficiency, long life, high reliability and no pollution. In some applications, it is hoped that the brightness of the light can be adjusted in some cases to further save energy and provide comfortable lighting.

[0003] The existing regulation circuits are often adjusted step by step, with level one brightness, level two brightness, level three brightness, etc., and cannot achieve stepless regulation, and need to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a constant voltage adjustable LED drive controller to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A constant voltage adjustable LED drive controller, comprising:

[0007] A working power module is used to provide working voltage for the triangle wave output module and the output voltage regulation module;

[0008] A triangle wave output module, used for outputting a triangle wave to supply an output voltage regulating module;

[0009] The output voltage regulating module is used to adjust the conduction state of the voltage output module and change the output voltage;

[0010] Voltage output module, used to output constant voltage DC power to supply LED, LED lighting;

[0011] The working power module is connected to the triangular wave output module and the output voltage regulating module, the triangular wave output module is connected to the output voltage regulating module, and the output voltage regulating module is connected to the voltage output module.

[0012] As a further solution of the utility model: the working power module includes resistor R1, resistor R2, resistor R3, and a controllable precision voltage-stabilizing source Z1. One end of the resistor R1 is connected to the voltage VDD, and the other end of the resistor R1 is connected to the negative electrode of the controllable precision voltage-stabilizing source Z1, one end of the resistor R2, a triangle wave output module, and an output voltage adjustment module. The other end of the resistor R2 is connected to one end of the resistor R3 and the reference electrode of the controllable precision voltage-stabilizing source Z1. The other end of the resistor R3 is grounded, and the positive electrode of the controllable precision voltage-stabilizing source Z1 is grounded. The model of the controllable precision voltage-stabilizing source Z1 is TL431.

[0013] As a further solution of the utility model: the triangle wave output module includes resistor R6, resistor R7, resistor R8, amplifier U2, resistor R9, resistor R10, and capacitor C2, one end of resistor R6 is connected to the working power module, the other end of resistor R6 is connected to one end of resistor R7, the in-phase end of amplifier U2, and one end of resistor R8, the other end of resistor R7 is grounded, the other end of resistor R8 is connected to the output end of amplifier U2, one end of resistor R9, and one end of resistor R10, the other end of resistor R9 is connected to the working power module, the other end of resistor R10 is connected to the inverting end of amplifier U2, one end of capacitor C2, and the output voltage regulation module, and the other end of capacitor C2 is grounded.

[0014] As a further solution of the utility model: the output voltage regulation module includes a resistor R4, a potentiometer RP1, and an amplifier U1, one end of the resistor R4 is connected to the working power module, the other end of the resistor R4 is connected to one end of the potentiometer RP1 and the in-phase end of the amplifier U1, the other end of the potentiometer RP1 is grounded, the inverting end of the amplifier U1 is connected to the triangle wave output module, and the output end of the amplifier U1 is connected to the voltage output module.

[0015] As a further solution of the utility model: the voltage output module includes a MOS tube V1, a capacitor C1, and a resistor R5, the D pole of the MOS tube V1 is connected to the voltage VDD, the G pole of the MOS tube V1 is connected to the output voltage regulation module, the S pole of the MOS tube V1 is connected to one end of the capacitor C1 and one end of the resistor R5, the other end of the capacitor C1 is grounded, the other end of the resistor R5 is grounded, and the S pole of the MOS tube V1 outputs the voltage VOUT to the LED.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model adjusts the duty cycle of the PWM signal output to the voltage output module through the output voltage adjustment module, thereby changing the voltage of the voltage output module and realizing stepless adjustment of the LED voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of a constant voltage adjustable LED driver controller.

[0018] Figure 2 It is the circuit diagram of the working power module, output voltage regulation module and voltage output module.

[0019] Figure 3 This is the circuit diagram of the triangle wave output module. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 , a constant voltage adjustable LED drive controller, comprising:

[0022] A working power module is used to provide working voltage for the triangle wave output module and the output voltage regulation module;

[0023] A triangle wave output module, used for outputting a triangle wave to supply an output voltage regulating module;

[0024] The output voltage regulating module is used to adjust the conduction state of the voltage output module and change the output voltage;

[0025] Voltage output module, used to output constant voltage DC power to supply LED, LED lighting;

[0026] The working power module is connected to the triangular wave output module and the output voltage regulating module, the triangular wave output module is connected to the output voltage regulating module, and the output voltage regulating module is connected to the voltage output module.

[0027] In this example: See Figure 2 The working power module includes a resistor R1, a resistor R2, a resistor R3, and a controllable precision voltage regulator Z1. One end of the resistor R1 is connected to the voltage VDD, and the other end of the resistor R1 is connected to the negative electrode of the controllable precision voltage regulator Z1, one end of the resistor R2, a triangle wave output module, and an output voltage adjustment module. The other end of the resistor R2 is connected to one end of the resistor R3 and the reference electrode of the controllable precision voltage regulator Z1. The other end of the resistor R3 is grounded, and the positive electrode of the controllable precision voltage regulator Z1 is grounded. The model of the controllable precision voltage regulator Z1 is TL431.

[0028] A fixed voltage is set at the reference pole of the controllable precision voltage regulator Z1, and TL431 is a 2.5V reference source. Therefore, by setting resistors R2 and R3, a fixed working voltage is finally obtained at the negative pole of the controllable precision voltage regulator Z1 to supply the triangle wave output module and the output voltage regulation module.

[0029] In this example: See Figure 3The triangle wave output module includes resistor R6, resistor R7, resistor R8, amplifier U2, resistor R9, resistor R10, and capacitor C2. One end of resistor R6 is connected to the working power module, the other end of resistor R6 is connected to one end of resistor R7, the in-phase end of amplifier U2, and one end of resistor R8, the other end of resistor R7 is grounded, the other end of resistor R8 is connected to the output end of amplifier U2, one end of resistor R9, and one end of resistor R10, the other end of resistor R9 is connected to the working power module, the other end of resistor R10 is connected to the inverting end of amplifier U2, one end of capacitor C2, and the output voltage adjustment module, and the other end of capacitor C2 is grounded.

[0030] Initially, there is no voltage on capacitor C2, the voltage at the in-phase terminal of amplifier U2 is higher than the voltage at the in-phase terminal, and amplifier U2 outputs a high level. At this time, the voltage charges capacitor C2 through resistor R10. As capacitor C2 is charged, the voltage at the in-phase terminal of amplifier U2 is lower than the voltage at the in-phase terminal, and amplifier U2 outputs a low level. At this time, capacitor C2 is discharged through resistor R10 and becomes a low level again. In a cycle of charging and discharging capacitor C2, a triangular wave signal is formed. Capacitor C2 is charged and discharged back and forth to form a triangular wave signal, which is output to the output voltage regulation module.

[0031] In this example: See Figure 2 The output voltage regulation module includes a resistor R4, a potentiometer RP1, and an amplifier U1. One end of the resistor R4 is connected to the working power module, the other end of the resistor R4 is connected to one end of the potentiometer RP1 and the in-phase end of the amplifier U1, the other end of the potentiometer RP1 is grounded, the inverting end of the amplifier U1 is connected to the triangle wave output module, and the output end of the amplifier U1 is connected to the voltage output module.

[0032] The voltage at the in-phase terminal of the amplifier U1 is adjusted by adjusting the resistance value of the potentiometer RP1. The voltage at the inverting terminal of the amplifier U1 is a triangle wave signal. The duty cycle of the PWM signal output by the amplifier U1 is changed by changing the voltage at the in-phase terminal of the amplifier U1.

[0033] In this example: See Figure 2 The voltage output module includes a MOS tube V1, a capacitor C1, and a resistor R5. The D pole of the MOS tube V1 is connected to the voltage VDD, the G pole of the MOS tube V1 is connected to the output voltage regulation module, the S pole of the MOS tube V1 is connected to one end of the capacitor C1 and one end of the resistor R5, the other end of the capacitor C1 is grounded, and the other end of the resistor R5 is grounded. The S pole of the MOS tube V1 outputs the voltage VOUT to the LED.

[0034] Based on the different duty cycles of the PWM signal, the conduction time of the MOS tube V1 is different, and the final output voltage VOUT is different, which meets the use requirements of different LEDs.

[0035] The working principle of the utility model is: the working power module is used to provide working voltage for the triangular wave output module and the output voltage regulation module; the triangular wave output module is used to output triangular waves to supply the output voltage regulation module; the output voltage regulation module is used to adjust the conduction state of the voltage output module and change the output voltage; the voltage output module is used to output constant voltage direct current to supply LED, and the LED emits light for illumination.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A constant voltage adjustable LED drive controller, characterized in that: The constant voltage adjustable LED driver controller includes: A working power module is used to provide working voltage for the triangle wave output module and the output voltage regulation module; A triangle wave output module, used for outputting a triangle wave to supply an output voltage regulating module; The output voltage regulating module is used to adjust the conduction state of the voltage output module and change the output voltage; Voltage output module, used to output constant voltage DC power to supply LED, LED lighting; The working power module is connected to the triangular wave output module and the output voltage regulating module, the triangular wave output module is connected to the output voltage regulating module, and the output voltage regulating module is connected to the voltage output module.

2. The constant voltage adjustable LED drive controller according to claim 1, characterized in that: The working power module includes resistor R1, resistor R2, resistor R3, and a controllable precision voltage-stabilizing source Z1. One end of the resistor R1 is connected to the voltage VDD, and the other end of the resistor R1 is connected to the negative electrode of the controllable precision voltage-stabilizing source Z1, one end of the resistor R2, a triangle wave output module, and an output voltage adjustment module. The other end of the resistor R2 is connected to one end of the resistor R3 and the reference electrode of the controllable precision voltage-stabilizing source Z1. The other end of the resistor R3 is grounded, and the positive electrode of the controllable precision voltage-stabilizing source Z1 is grounded. The model of the controllable precision voltage-stabilizing source Z1 is TL431.

3. The constant voltage adjustable LED drive controller according to claim 1, characterized in that: The triangle wave output module includes resistor R6, resistor R7, resistor R8, amplifier U2, resistor R9, resistor R10, and capacitor C2. One end of resistor R6 is connected to the working power module, the other end of resistor R6 is connected to one end of resistor R7, the in-phase end of amplifier U2, and one end of resistor R8, the other end of resistor R7 is grounded, the other end of resistor R8 is connected to the output end of amplifier U2, one end of resistor R9, and one end of resistor R10, the other end of resistor R9 is connected to the working power module, the other end of resistor R10 is connected to the inverting end of amplifier U2, one end of capacitor C2, and the output voltage regulation module, and the other end of capacitor C2 is grounded.

4. The constant voltage adjustable LED drive controller according to claim 3, characterized in that: The output voltage regulation module includes a resistor R4, a potentiometer RP1, and an amplifier U1. One end of the resistor R4 is connected to the working power module, the other end of the resistor R4 is connected to one end of the potentiometer RP1 and the in-phase end of the amplifier U1, the other end of the potentiometer RP1 is grounded, the inverting end of the amplifier U1 is connected to the triangle wave output module, and the output end of the amplifier U1 is connected to the voltage output module.

5. The constant voltage adjustable LED drive controller according to claim 1, characterized in that: The voltage output module includes a MOS tube V1, a capacitor C1, and a resistor R5. The D pole of the MOS tube V1 is connected to the voltage VDD, the G pole of the MOS tube V1 is connected to the output voltage adjustment module, the S pole of the MOS tube V1 is connected to one end of the capacitor C1 and one end of the resistor R5, the other end of the capacitor C1 is grounded, the other end of the resistor R5 is grounded, and the S pole of the MOS tube V1 outputs the voltage VOUT to the LED.

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