Multifunctional LED dimming power supply

Abstract

The utility model relates to the technical field of lamp power supplies, and discloses a multifunctional LED dimming power supply in order to solve the technical problem of single dimming signal of the existing dimming LED power supply, which is provided with a PWM (Pulse Width Modulation) controller, a first operational amplifier, a second operational amplifier, a fourth operational amplifier, an oscillator, a reference voltage source and a voltage stabilizer, the first OR gate is connected with the output end of the fourth operational amplifier and the output end of the second operational amplifier, the second OR gate is connected with the output end of the first operational amplifier and the output end of the first OR gate, the output end of the second OR gate is connected with the input end of the PWM controller, the AND gate is connected with the output end of the PWM controller and an external PWM dimming signal, and the AND gate is connected with the output end of the PWM controller. The output end of the AND gate is connected with the input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the controlled end of the switching tube. Three dimming modes are set to adapt to three different types of external dimming signals, different types of dimming signals are adapted, the problem that the dimming signal is single is solved, and multifunctional dimming is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lamp power supplies, in particular to a multifunctional LED dimming power supply. Background Art

[0002] Lighting is indispensable in daily life and work, especially LED lighting has become the mainstream choice. In order to meet the lighting needs of different scenarios, various types of light sources need to be adopted, which has prompted the development and application of LED dimming power supplies. LED dimming power supplies, also known as LED segmented dimming power supplies, can adjust the brightness through external dimming signals. However, the current LED dimming power supplies on the market can usually only handle one type of dimming signal, which makes them difficult to be compatible and adapt to the various dimming signal forms available on the market. The existence of multiple dimming signals, including PWM (pulse width modulation), 0-10V, DALI (digital addressable lighting interface), etc., requires LED dimming power supplies to have higher compatibility and flexibility to adapt to different application requirements.

[0003] This limitation of single dimming signal support not only restricts the diversity and flexibility of LED lighting systems, but also affects the user experience and the overall efficiency of the system.

[0004] Therefore, developing LED dimming power supplies that are compatible with multiple dimming signals has become an important direction for improving the performance of LED lighting systems and user satisfaction. Utility Model Content

[0005] The utility model aims to provide a multifunctional LED dimming power supply to solve the technical problem of the single dimming signal of the existing dimming LED power supply.

[0006] To achieve the above purpose, the specific technical solution of a multifunctional LED dimming power supply of the utility model is as follows:

[0007] A multifunctional LED dimming power supply comprises an input power supply circuit and a dimming circuit, wherein the dimming circuit comprises a switch tube, wherein the upper end of the switch tube is connected to an LED load via an inductor, and the lower end of the switch tube is grounded via a current-sense resistor, and is provided with a PWM controller, a first operational amplifier for amplifying a signal flowing through the current-sense resistor, a second operational amplifier for amplifying a first dimming voltage signal, a fourth operational amplifier for amplifying a second dimming voltage signal, an oscillator for providing an oscillation signal to the PWM controller, a reference voltage source for providing a reference voltage to the oscillator, the first operational amplifier, and the second operational amplifier, and a voltage stabilizer for providing a stable voltage to the reference voltage source;

[0008] A first OR gate is provided which is respectively connected to the output ends of the fourth operational amplifier and the second operational amplifier, and a second OR gate is respectively connected to the output end of the first operational amplifier and the output end of the first OR gate, the output end of the second OR gate is connected to the input end of the PWM controller, and an AND gate which is respectively connected to the output end of the PWM controller and the external PWM dimming signal is provided, the output end of the AND gate is connected to the input end of the third operational amplifier, and the output end of the third operational amplifier is connected to the controlled end of the switch tube.

[0009] The circuit can accept external PWM dimming signals and two different forms of voltage dimming signals to achieve flexible dimming control. This allows the circuit to adapt to different dimming requirements and application scenarios.

[0010] The lower end of the switch tube is grounded through a current-sense resistor, and the current signal flowing through the current-sense resistor is amplified by the first operational amplifier for feedback control. This design can effectively control the current of the LED load, prevent overcurrent or unstable current conditions, and extend the service life of the LED.

[0011] The oscillation signal provided by the oscillator enables the PWM controller to generate a stable PWM signal, thereby controlling the on / off state of the switch tube. By adjusting the frequency of the oscillator, the brightness of the LED can be flexibly adjusted.

[0012] The first OR gate, the second OR gate and the AND gate play a role of logic control in the circuit. By combining different signals and selecting the required control signal type, the controllability and flexibility of the circuit are improved.

[0013] Furthermore, the input power supply circuit includes an EMC circuit that uses the input AC power to reduce noise. The EMC circuit is provided with a first rectifier circuit and a second rectifier circuit at the rear stage. The first rectifier circuit and the second rectifier circuit are grounded in common. A first direct current is output through the first rectifier circuit, and a second direct current is output through the second rectifier circuit.

[0014] The EMC (electromagnetic compatibility) circuit is used to suppress noise and interference signals in the mains input, ensuring that the power supply circuit can work stably and is not affected by external electromagnetic interference. The first rectifier circuit and the second rectifier circuit convert the AC mains into a stable first direct current and a second direct current, providing the required voltage for different circuit modules to ensure stable operation of the circuit. The first rectifier circuit and the second rectifier circuit are grounded together, which helps to reduce the ground potential difference and further improve the stability and anti-interference ability of the circuit.

[0015] Furthermore, a first dimming voltage signal generating circuit for generating a first dimming voltage signal is provided, comprising a fixed resistor and a potentiometer connected in series, a second direct current is input to the first end of the fixed resistor, the second end of the fixed resistor is grounded through the potentiometer, a sliding end of the potentiometer is connected to the inverting input end of the second operational amplifier, and a non-inverting input end of the second operational amplifier is connected to a reference voltage source.

[0016] By combining a fixed resistor and a potentiometer, the potentiometer can be adjusted to accurately control the output first dimming voltage signal, providing an accurate dimming function. The design of the potentiometer allows the user to manually adjust the brightness of the LED conveniently, providing flexible dimming control. The non-inverting input of the second op amp is connected to the reference voltage source to ensure the stability of the reference voltage, thereby ensuring the stability and accuracy of the dimming voltage signal.

[0017] Furthermore, a second dimming voltage signal generating circuit for generating a second dimming voltage signal is provided, including a fourth operational amplifier, a first button and a second button, the second direct current is input to the power supply terminal of the fourth operational amplifier, the second direct current is input to the non-inverting input terminal of the fourth operational amplifier through a current limiting resistor, the inverting input terminal of the fourth operational amplifier is connected to ground through the first button and a pull-down resistor in sequence, and is connected to ground through an electrolytic capacitor, and the inverting input terminal of the fourth operational amplifier is also connected to the second direct current through the second button and a pull-up resistor in sequence.

[0018] Through the design of the first button and the second button, the user can adjust the second dimming voltage signal through simple button operation, providing a convenient dimming method. The inverting input terminal is grounded through an electrolytic capacitor, which can filter out the jitter signal generated by the button operation to ensure the stability and accuracy of the dimming signal. Through the combination of buttons and resistors, users can finely adjust the dimming voltage signal to meet different brightness requirements.

[0019] The utility model provides a multifunctional LED dimming power supply with the following advantages:

[0020] The utility model provides a multifunctional LED dimming power supply, which can adapt to three different types of external dimming signals by setting three dimming modes, namely knob dimming, button dimming and external input PWM signal dimming, and finally convert them into PWM signals to control the switch tube, so that one power supply can adapt to different types of dimming signals, solves the problem of single dimming signal, is compatible with key-controlled dimmers, PWM dimmers and potentiometer dimmers, and realizes multifunctional dimming. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The input power supply and power branch block diagram provided by the utility model;

[0022] Figure 2This is a schematic diagram of the multifunctional LED dimming power supply provided by the utility model.

[0023] In the figure: Y1, oscillator; Q3, switch tube; R50, potentiometer; R53, current sensing resistor; R59, fixed resistor; R55, pull-up resistor; R54, pull-down resistor; K1, first button; K2, second button; DC1, first direct current; DC2, second direct current; U12, first op amp; U13, second op amp; U21, third op amp; U28, fourth op amp; U15, PWM controller; C22, electrolytic capacitor; U18, first OR gate; U19, AND gate; U24, reference voltage source; U25, voltage regulator; U26, second OR gate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] See also Figure 1 to Figure 2 The utility model provides a multifunctional LED dimming power supply, including an EMC circuit for reducing noise with input mains power. The rear stage of the EMC circuit is respectively provided with a first rectifier circuit and a second rectifier circuit. The first rectifier circuit and the second rectifier circuit are grounded in common. The first rectifier circuit outputs a first direct current DC1 mainly for supplying power to an LED load, and the second rectifier circuit outputs a second direct current DC2 mainly for supplying power to a dimming circuit.

[0026] The dimming circuit includes a switch tube Q3, which is a NOMS tube. The drain of the switch tube Q3 is connected to the LED load through an inductor L3, and the source of the switch tube Q3 is grounded through a current detection resistor R53.

[0027] It includes a PWM controller U15, a first operational amplifier U12 for amplifying a current detection signal, a second operational amplifier U13 for amplifying a first dimming voltage signal, a fourth operational amplifier U28 for amplifying a second dimming voltage signal, an oscillator Y1 for providing an oscillation signal to the PWM controller U15, a reference voltage source U24 for providing a reference voltage to the oscillator Y1, the first operational amplifier U12, and the second operational amplifier U13, and a voltage regulator U25 for providing a stable voltage to the reference voltage source U24.

[0028] The output ends of the fourth operational amplifier U28 and the second operational amplifier U13 are respectively connected to the two input ends of the first OR gate U18, the output end of the first operational amplifier U12 and the output end of the first OR gate U18 are respectively connected to the two input ends of the second OR gate U26, the output end of the second OR gate U26 is connected to the input end of the PWM controller U15, the output end of the PWM controller U15 and the external PWM dimming signal are respectively input to the two input ends of the AND gate U19, the output end of the AND gate U19 is connected to the input end of the third operational amplifier U21, and the output end of the third operational amplifier U21 is connected to the gate of the switch tube Q3.

[0029] The first direct current DC1 supplies power to the reference voltage source U24 and the operational amplifier 21 through the output voltage of the voltage regulator U25.

[0030] The first dimming voltage signal generating circuit includes a fixed resistor R59 and a potentiometer R50 connected in series, the first end of the fixed resistor R59 is input with a second DC voltage DC2, the second end of the fixed resistor R59 is grounded through the potentiometer R50, the sliding end of the potentiometer R50 is connected to the inverting input end of the second operational amplifier U13, and the non-inverting input end of the second operational amplifier U13 is connected to the reference voltage source U24. When the potentiometer R50 is rotated, the voltage-dividing signal output from the sliding end changes, that is, the voltage at the inverting input end is changed, and is compared with the reference voltage at the non-inverting input end in the second operational amplifier U13, thereby changing the output voltage of the second operational amplifier U13.

[0031] The second dimming voltage signal generating circuit includes a fourth operational amplifier U28, a first button K1 and a second button K2. The power supply terminal of the fourth operational amplifier U28 is input with the second direct current DC2. The in-phase input terminal of the fourth operational amplifier U28 is sequentially input with the second direct current DC2 through resistors R56 and R58. The inverting input terminal of the fourth operational amplifier U28 is sequentially connected to ground through the first button K1 and the pull-down resistor R54, and is grounded through the electrolytic capacitor C22. The inverting input terminal of the fourth operational amplifier U28 is also sequentially connected with the second direct current power supply DC2 through the second button K2 and the pull-up resistor R55.

[0032] The fourth operational amplifier U28 is used as a comparison amplifier here. A large capacitor C22 is connected to its inverting input terminal as a reference comparison voltage. The capacitor is discharged through the first button K1 and charged through the second button K2, thereby changing the voltage at the inverting input terminal and comparing it with the non-inverting input terminal, thereby changing the output voltage of the fourth operational amplifier U28.

[0033] When one of the buttons is pressed, the light gradually changes from dark to bright; when the other button is pressed, the light gradually changes from bright to dark until it goes out.

[0034] To sum up, the utility model provides a multifunctional LED dimming power supply, which can adapt to three different types of external dimming signals by setting three dimming modes, namely knob dimming, button dimming and external input PWM signal dimming, and finally convert them into PWM signals to control the switch tube, so that one power supply can adapt to different types of dimming signals, solves the problem of single dimming signal, and is compatible with key-controlled dimmers, PWM dimmers and potentiometer dimmers.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional LED dimming power supply, comprising an input power circuit and a dimming circuit, wherein the dimming circuit comprises a switch tube (Q3), wherein the upper end of the switch tube (Q3) is connected to an LED load via an inductor (L3), and the lower end of the switch tube (Q3) is grounded via a current sensing resistor (R53), wherein: A PWM controller (U15) is provided, a first operational amplifier (U12) for amplifying a signal flowing through a current-sensing resistor (R53), a second operational amplifier (U13) for amplifying a first dimming voltage signal, a fourth operational amplifier (U28) for amplifying a second dimming voltage signal, an oscillator (Y1) for providing an oscillation signal to the PWM controller (U15), a reference voltage source (U24) for providing a reference voltage to the oscillator (Y1), the first operational amplifier (U12) and the second operational amplifier (U13), and a voltage stabilizer (U25) for providing a stable voltage to the reference voltage source (U24); A first OR gate (U18) is provided which is respectively connected to the output ends of the fourth operational amplifier (U28) and the second operational amplifier (U13), and a second OR gate (U26) is respectively connected to the output end of the first operational amplifier (U12) and the output end of the first OR gate (U18), the output end of the second OR gate (U26) is connected to the input end of the PWM controller (U15), and an AND gate (U19) is provided which is respectively connected to the output end of the PWM controller (U15) and the external PWM dimming signal, the output end of the AND gate (U19) is connected to the input end of the third operational amplifier (U21), and the output end of the third operational amplifier (U21) is connected to the controlled end of the switch tube (Q3).

2. A multifunctional LED dimming power supply according to claim 1, characterized in that: The input power supply circuit includes an EMC circuit that uses input mains to reduce noise. The EMC circuit is provided with a first rectifier circuit and a second rectifier circuit at the rear stage. The first rectifier circuit and the second rectifier circuit are grounded in common. A first direct current (DC1) is output through the first rectifier circuit, and a second direct current (DC2) is output through the second rectifier circuit.

3. A multifunctional LED dimming power supply according to claim 2, characterized in that: A first dimming voltage signal generating circuit for generating a first dimming voltage signal is provided, comprising a fixed resistor (R59) and a potentiometer (R50) connected in series, a second direct current (DC2) is input to the first end of the fixed resistor (R59), a second end of the fixed resistor (R59) is grounded via the potentiometer (R50), a sliding end of the potentiometer (R50) is connected to an inverting input end of a second operational amplifier (U13), and a non-inverting input end of the second operational amplifier (U13) is connected to a reference voltage source (U24).

4. The multifunctional LED dimming power supply according to claim 3, characterized in that: A second dimming voltage signal generating circuit for generating a second dimming voltage signal is provided, comprising a fourth operational amplifier (U28), a first button (K1) and a second button (K2); a second direct current (DC2) is input to a power supply end of the fourth operational amplifier (U28); a second direct current (DC2) is input to a non-inverting input end of the fourth operational amplifier (U28) via a current limiting resistor; an inverting input end of the fourth operational amplifier (U28) is connected to ground via the first button (K1) and a pull-down resistor (R54) in sequence, and is connected to ground via an electrolytic capacitor (C22); and the inverting input end of the fourth operational amplifier (U28) is also connected to the second direct current (DC2) via a second button (K2) and a pull-up resistor (R55) in sequence.

Images