CN116437526A - Wide-voltage self-adaptive light-emitting diode constant-current driving circuit - Google Patents
Wide-voltage self-adaptive light-emitting diode constant-current driving circuit Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- H05B45/355—Power factor correction [PFC]; Reactive power compensation
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Abstract
A wide-voltage self-adaptive LED constant-current drive circuit comprises an input circuit, a power factor correction circuit, a step-down power circuit, a power switching circuit and a step-down control circuit. The input circuit receives an alternating voltage input signal to generate a rectified signal. The power factor correction circuit receives the rectified signal to generate a drive signal. The buck power circuit receives the driving signal to generate a constant current output signal to drive the load, and the buck power circuit is provided with a detection point. The power switching circuit comprises a power switch, and the detection voltage of the detection point generates a first sampling signal through the power switch. The buck control circuit generates a modulation signal according to the first sampling signal to adjust a constant current output signal of the buck power circuit.
Description
Technical Field
The present invention relates to a constant current driving circuit for a light emitting diode, and more particularly, to a constant current driving circuit for a wide-voltage adaptive light emitting diode.
Background
The conventional LED constant current driving circuit can only be applied to one LED load. If the output current of the led constant current driving circuit is to be changed, the user needs to adjust the power parameter of the led constant current driving circuit or replace the led constant current driving circuit, which is inconvenient in use. The output current of part of the existing light-emitting diode constant current driving circuit can be adjusted. In general, the output current can be changed by adjusting the resistance value of the current detection resistor through an electronic switch. However, the above adjustment mechanism makes the electronic switch bear a great current stress, so the existing led constant current driving circuit still has the disadvantages of low reliability, low precision, poor safety and the like in high-power application.
Both chinese patent publication CN110839311a and chinese patent publication CN112996181a disclose technical schemes related to constant current driving circuits, but the problems of the prior art cannot be solved effectively.
Disclosure of Invention
The invention provides a wide-voltage self-adaptive light-emitting diode constant-current driving circuit which comprises an input circuit, a power factor correction circuit, a step-down power circuit, a power switching circuit and a step-down control circuit. The input circuit receives an alternating voltage input signal to generate a rectified signal. The power factor correction circuit receives the rectified signal to generate a drive signal. The buck power circuit receives the driving signal to generate a constant current output signal to drive the load, and the buck power circuit is provided with a detection point. The power switching circuit is used for processing the detection voltage of the detection point to generate a first sampling signal. The buck control circuit generates a modulation signal according to the first sampling signal to adjust a constant current output signal of the buck power circuit.
As an improvement of the application, the light-emitting diode constant current driving circuit further comprises a power factor control circuit. The power factor control circuit receives the second sampling signal by the power factor correction circuit to generate a power factor control signal, and the power factor correction circuit adjusts the driving signal according to the power factor control signal.
As an improvement of the present application, the power switching circuit has a power switch that is switched to change the first sampling signal.
As an improvement of the present application, the buck control circuit generates the modulation signal according to the first sampling signal and the reference voltage signal.
As an improvement of the present application, the modulation signal is a pulse width modulation signal.
As an improvement of the LED constant current driving circuit, the LED constant current driving circuit further comprises an auxiliary power supply circuit, an induction circuit and a dimming control circuit. The auxiliary power circuit receives the driving signal to generate a power signal to drive the sensing circuit. The sensing circuit generates a sensing signal, and the dimming control circuit receives the sensing signal to generate a dimming signal. The step-down control circuit adjusts the modulation signal according to the dimming signal to adjust the constant current output signal of the step-down power circuit.
As an improvement of the application, the sensing circuit is a microwave sensor or an infrared sensor.
As an improvement of the present application, the input circuit includes a rectifying circuit, a filter circuit, and an anti-surge circuit.
As an improvement of the present application, the rectifying circuit is a bridge rectifier.
As an improvement of the present application, the load is a light emitting diode or an array of light emitting diodes.
In view of the foregoing, the wide-voltage adaptive led constant current driving circuit according to the embodiments of the present invention may have one or more of the following advantages:
(1) The circuit design of the LED constant current drive circuit can provide a power regulation function, so that the input circuit can reach a wide voltage input range. Therefore, the light-emitting diode constant current driving circuit can be suitable for various light-emitting diode loads. In addition, the LED constant current driving circuit can achieve high efficiency. Therefore, the LED constant current driving circuit can be widely applied and can accord with the trend of future development.
(2) The step-down power circuit of the LED constant current driving circuit is provided with a detection point, and the power switching circuit comprises a power switch. The detection voltage of the detection point generates a first sampling signal through the power switching circuit, and the step-down control circuit generates a modulation signal according to the first sampling signal so as to adjust a constant current output signal of the step-down power circuit. The first sampling signal may be changed by switching a power switch of the power switching circuit. Therefore, the power switch is used for processing the small signal sampled by the detection point, so that the power switch does not need to bear large stress impact. Therefore, the safety and the reliability of the light-emitting diode constant current driving circuit can be greatly improved, and smooth power switching can be realized.
(3) The power switching circuit of the LED constant current driving circuit is provided with a power switch. The constant current output signal of the step-down power circuit can be adjusted by a user through a plurality of gears of the power switch. Therefore, the brightness of the lighting device adopting the LED constant current driving circuit can meet the requirements of different applications, and the lighting device is more flexible in use.
(4) The dimming control circuit of the light-emitting diode constant current driving circuit can be a pulse width modulation dimming circuit, a resistance type dimming circuit and a voltage type dimming circuit. Therefore, the light-emitting diode constant-current driving circuit can support a plurality of dimming mechanisms, and can be applied to different environments so as to meet the requirements of practical application.
(5) The light-emitting diode constant current driving circuit is provided with an induction circuit, and the induction circuit can be a microwave sensor or an infrared sensor. Therefore, the light-emitting diode constant current driving circuit can support different sensors so as to meet the requirements of various intelligent applications.
(6) The circuit design of the LED constant current driving circuit is simple, and the effect to be achieved can be achieved on the premise of not greatly increasing the cost. Therefore, the practicability of the light-emitting diode constant current driving circuit can be effectively improved.
Drawings
Fig. 1 is a block diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 2 of the present invention;
fig. 3 is a block diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 3 of the present invention.
Reference numerals illustrate:
1-a light emitting diode constant current driving circuit; 11-an input circuit; 12-a power factor correction circuit; 13-a power factor control circuit; 14-a buck power circuit; 141-an output filter circuit; 15-a step-down control circuit; 151-an output control circuit; a 16-power switching circuit; 17-an auxiliary power circuit; an 18-sense circuit; a 19-dimming control circuit; e1-an output terminal; e2-a first input; e2' -a second input; SW-power switch; w1, w2, w 3-switch; r1-a first resistor; r2-a second resistor; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7-seventh resistor; r8-eighth resistor; r9-ninth resistance; r10-tenth resistor; rs 1-a first detection resistor; rs 2-second sense resistor; VR-variable resistance; d1-a first diode; d2—a second diode; d3-a third diode; q1-transistors; c1-a first capacitance; c2-a second capacitance; a C3-third capacitor; l1-a first inductor; l2-a second inductor; n1-a first node; n2-a second node; n3-third node; n4-fourth node; n5-fifth node; n6-sixth node; ns—a detection point; GND-ground; vcc-an operating voltage source; LD-load; an anode of the LED + -load; led—negative electrode of the load; as-ac voltage input signals; rs-rectified signal; ds-drive signal; ps-power factor control signal; ms-modulated signals; vs-power signal; ts-sense signal; us-dimming signal; s1-a first sampling signal; s2-a second sampling signal; SV-the detection voltage; cs-constant current output signal.
The detailed features and advantages of the present invention will be readily apparent to those skilled in the art from the same disclosure, claims, and drawings as herein described.
Detailed Description
Embodiments of the wide voltage adaptive led constant current drive circuit according to the present invention will be described with reference to the accompanying drawings, in which the dimensions and proportions of the various elements may be exaggerated or reduced for clarity and convenience in illustration. In the following description and/or claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present and other words describing the relationship between the elements or layers should be interpreted in the same manner. For ease of understanding, like components in the following embodiments are denoted by like reference numerals.
Referring to fig. 1, a block diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 1 of the present invention is shown. As shown in the figure, the light emitting diode constant current driving circuit 1 includes an input circuit 11, a power factor correction circuit 12, a power factor control circuit 13, a step-down power circuit 14, a step-down control circuit 15, and a power switching circuit 16. The input circuit 11 is connected to the power factor correction circuit 12. The power factor correction circuit 12 is connected to the power factor control circuit 13 and the step-down power circuit 14. The step-down power circuit 14 is connected to a step-down control circuit 15, a power switching circuit 16, and a load LD. The step-down control circuit 15 is connected to the power switching circuit 16.
The input circuit 11 receives an ac voltage input signal As to generate a rectified signal Rs. The ac voltage input signal As may be input by an external power source (e.g., mains, generator, etc.). In embodiment 1, the input circuit 11 includes a rectifying circuit, a filter circuit, and an anti-surge circuit. In embodiment 1, the rectifying circuit may be a bridge rectifier, such as a full bridge rectifier, a half bridge rectifier, or other similar components.
The power factor correction circuit 12 receives the rectified signal Rs to generate the drive signal Ds. In embodiment 1, the power factor correction circuit 12 can be various conventional power factor correction circuits, and the circuit structure thereof should be well known to those skilled in the art, so that the description thereof is omitted herein.
The power factor control circuit 13 receives the second sampling signal S2 from the power factor correction circuit 12 to generate a power factor control signal Ps, and the power factor correction circuit 12 adjusts the driving signal Ds according to the power factor control signal Ps. In embodiment 1, the power factor control circuit 13 can be various existing power factor controllers, which can receive feedback signals to generate the power factor control signal Ps to perform the power factor correction function. The circuit structure and operation mechanism of the power factor control circuit 13 should be well known to those skilled in the art, and thus will not be described in detail herein.
The step-down power circuit 14 receives the driving signal Ds to generate a constant current output signal Cs to drive the load LD. The buck power circuit 14 has a detection point that can provide a detection voltage SV. In embodiment 1, the buck power circuit 14 can be various existing buck power chips, and the circuit structure thereof should be well known to those skilled in the art, so the description thereof is omitted herein. In embodiment 1, the load is a Light Emitting Diode (LED), a light emitting diode array, or other similar component.
The power switching circuit 16 includes a power switch. The detection voltage SV at the detection point of the step-down power circuit 14 may generate the first sampling signal S1 through the power switching circuit 16. The first sampling signal S1 may be changed by switching a power switch of the power switching circuit 16. In embodiment 1, the power switching circuit 16 can be various conventional power switching circuits, and the circuit structure thereof should be well known to those skilled in the art, so that the description thereof is omitted herein.
Then, the buck control circuit 15 generates the modulation signal Ms according to the first sampling signal S1 to adjust the constant current output signal Cs of the buck power circuit 14. The buck control circuit 15 generates the modulation signal Ms according to the first sampling signal S1 and the reference voltage signal. In embodiment 1, the modulation signal Ms may be a Pulse Width Modulation (PWM) signal; in another embodiment, the modulation signal Ms may be a sine wave signal, a square wave signal, or other similar signals. In embodiment 1, the buck control circuit 15 can be various existing buck control chips, and the circuit structure and the operation mechanism thereof should be well known to those skilled in the art, so the description thereof is omitted herein.
As can be seen from the above, the input circuit 11 of the led constant current driving circuit 1 has a wide voltage input range, so it can be applied to various led loads and achieve high performance. Therefore, the LED constant current driving circuit 1 can be widely applied and can be more in line with the trend of future development.
In addition, the step-down power circuit 14 of the light emitting diode constant current drive circuit 1 has a detection point, and the power switching circuit 16 thereof includes a power switch. The detected voltage SV at the detection point generates the first sampling signal S1 through the power switching circuit 16, and the step-down control circuit 15 generates the modulation signal Ms according to the first sampling signal S1 to adjust the constant current output signal Cs of the step-down power circuit 14. The first sampling signal S1 may be changed by switching a power switch of the power switching circuit 16. Therefore, the power switch is used for processing the small signal sampled by the detection point, so that the power switch does not need to bear large stress impact. In this way, the safety and reliability of the light-emitting diode constant current driving circuit 1 can be greatly improved, and smooth power switching can be realized.
Of course, embodiment 1 is only for illustrating the scope of the present invention, and equivalent modifications or variations of the wide voltage adaptive light emitting diode constant current driving circuit according to embodiment 1 are still included in the scope of the present invention.
Fig. 2 is a circuit diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 2 of the present invention. Embodiment 2 illustrates one of the circuit structures of the led constant current driving circuit 1 and the operation mechanism thereof. As shown, the buck control circuit 15 has an output terminal E1, a first input terminal E2, and a second input terminal E2'. The output terminal E1 of the step-down control circuit 15 is connected to the step-down power circuit 14 through an output control circuit 151. The first input terminal E2 of the buck control circuit 15 is connected to the first node N1, and the second input terminal E2' of the buck control circuit 15 is connected to the second node N2; the second node N2 is connected to the ground GND. One end of the output control circuit 151 is connected to the output terminal E1 of the step-down control circuit 15, and one end of the output control circuit 151 is connected to the third node N3. The output control circuit 151 includes a seventh resistor R7, an eighth resistor R8, and a first diode D1. The seventh resistor R7 is connected in series with the first diode D1, and the serial circuit formed by the seventh resistor R7 and the first diode D1 is connected in parallel with the eighth resistor R8.
The power switching circuit 16 includes a power switch SW, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a variable resistor VR. One end of the power switching circuit 16 is connected to the first node N1, and the other end of the power switching circuit 16 is connected to one end of the first resistor R1, one end of the second resistor R2, and one end of the third resistor R3, respectively. The other end of the first resistor R1, the other end of the second resistor R2, and the other end of the third resistor R3 are connected to the second node N2. The connecting power switch SW comprises three switches w1, w2, w3. The switch w1 is used for controlling whether one end of the first resistor R1 is connected to the first node N1. The switch w2 is used for controlling whether one end of the second resistor R2 is connected to the first node N1. The switch w3 is used for controlling whether one end of the first resistor R1 is connected to the first node N1. One end of the variable resistor VR is connected to the first node N1, and the other end of the variable resistor VR is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the second node N2. One end of the fifth resistor R5 is connected to the first node N1, and the other end of the fifth resistor R5 is connected to the step-down power circuit 14.
The step-down power circuit 14 has a detection point Ns connected to the other end of the fifth resistor R5. The step-down power circuit 14 includes a first detection resistor Rs1, a second detection resistor Rs2, a sixth resistor R6, a transistor Q1, a second diode D2, a third diode D3, a first capacitor C1, and a first inductor L1. One end of the first detection resistor Rs1 is connected to the detection point Ns, and the other end of the first detection resistor Rs1 is connected to the second node N2. One end of the second sensing resistor Rs2 is connected to the sensing point Ns, and the other end of the second sensing resistor Rs2 is connected to the second node N2. In embodiment 2, the detection resistor is formed by the first detection resistor Rs1 and the second detection resistor Rs2 connected in parallel, but not limited thereto. In another embodiment, the detection resistor may be one resistor or a plurality of resistors connected in series or parallel. One end of the sixth resistor R6 is connected to the third node N3, and the other end of the sixth resistor R6 is connected to the detection point Ns. The gate of the transistor Q1 is connected to the third node N3, the drain of the transistor Q1 is connected to the detection point Ns, and the source of the transistor Q1 is connected to the fourth node N4. In embodiment 2, the transistor Q1 is a mosfet. In another embodiment, the transistor Q1 may also be a transistor or other similar device. One end of the second diode D2 is connected to the fifth node N5, and the other end of the second diode D2 is connected to the fourth node N4. The fifth node N5 is connected to an operating voltage source Vcc. One end of the third diode D3 is connected to the fifth node N5, and the other end of the third diode D2 is connected to the fourth node N4. One end of the first capacitor C1 is connected to the fifth node N5, and the other end of the first capacitor C1 is connected to the sixth node N6. One end of the first inductor L1 is connected to the sixth node N6, and the other end of the first inductor L1 is connected to the fourth node N4.
The step-down power circuit 14 is connected to the positive led+ and the negative LED of the load LD through the output filter circuit 141 to drive the load LD. The output filter circuit 141 includes a second capacitor C2, a second capacitor C3, a ninth resistor R9, a tenth resistor R10, and a second inductor L2.
The first detection resistor Rs1 and the second detection resistor Rs2 can detect the current of the transistor Q1 switched each time, so that the detection point Ns generates the detection voltage SV. Then, the detected voltage SV is processed by the power switching circuit 16 to generate a first sampling signal S1, and the first sampling signal S1 is transmitted to the first input end E2 of the buck control circuit 15 (the first sampling signal S1 may represent the current power). Next, after the first sampling signal S1 is processed by the operational amplifier inside the buck control circuit 15, the internal buck circuit chip of the buck control circuit 15 performs an operation to compare the first sampling signal S1 with the reference voltage signal to generate the modulation signal Ms (the operation of the buck circuit chip is well known to those skilled in the art, and will not be repeated here). The modulation signal Ms can control the on time of the transistor Q1, so that the output power of the buck power circuit 14 can be adjusted to a proper value.
The user can connect one or more of the first resistor R1, the second resistor R2 and the third resistor R3 to the first node N1 by operating the power switch SW, so that the first detection resistor Rs1 and the second detection resistor Rs2 can be connected in parallel with one or more of the first resistor R1, the second resistor R2 and the third resistor R3. Thus, the user can adjust the first sampling signal S1 by operating the power switch SW to change the modulation signal Ms, thereby switching the output power of the buck power circuit 14.
In addition, since the power switch SW is used for processing the small signal sampled by the detection point Ns, the power switch SW does not need to bear large stress impact. In this way, the safety and reliability of the light-emitting diode constant current driving circuit 1 can be greatly improved, and smooth power switching can be realized.
In addition, the circuit design of the light-emitting diode constant current driving circuit 1 can achieve the function of power switching, so that the input circuit 11 can achieve a wide voltage input range, and the light-emitting diode constant current driving circuit is applicable to various light-emitting diode loads. In addition, the light-emitting diode constant current driving circuit 1 can achieve high efficiency. Therefore, the LED constant current driving circuit 1 can be widely applied and can be more in line with the trend of future development.
Of course, embodiment 2 is only for illustrating the scope of the present invention, and equivalent modifications or variations of the wide voltage adaptive led constant current driving circuit according to embodiment 2 are still included in the scope of the present invention.
It should be noted that, the output current of some existing light emitting diode constant current driving circuits can be adjusted. In general, the output current can be changed by adjusting the resistance value of the current detection resistor through an electronic switch. However, the existing light-emitting diode constant current driving circuit still has the defects of low reliability, low precision, poor safety and the like in high-power application. In contrast, according to embodiments 1-2 of the present invention, the circuit design of the constant current driving circuit of the light emitting diode can provide a power adjusting function, so that the input circuit can achieve a wide voltage input range. Therefore, the light-emitting diode constant current driving circuit can be suitable for various light-emitting diode loads. In addition, the LED constant current driving circuit can achieve high efficiency. Therefore, the LED constant current driving circuit can be widely applied and can accord with the trend of future development.
According to embodiment 1-2 of the present invention, the step-down power circuit of the light emitting diode constant current driving circuit has a detection point, and the power switching circuit thereof includes a power switch. The detection voltage of the detection point generates a first sampling signal through the power switching circuit, and the step-down control circuit generates a modulation signal according to the first sampling signal so as to adjust a constant current output signal of the step-down power circuit. The first sampling signal may be changed by switching a power switch of the power switching circuit. Therefore, the power switch is used for processing the small signal sampled by the detection point, so that the power switch does not need to bear large stress impact. Therefore, the safety and the reliability of the light-emitting diode constant current driving circuit can be greatly improved, and smooth power switching can be realized.
Also, according to embodiments 1-2 of the present invention, the power switching circuit of the light emitting diode constant current driving circuit has a power switch. The constant current output signal of the step-down power circuit can be adjusted by a user through a plurality of gears of the power switch. Therefore, the brightness of the lighting device adopting the LED constant current driving circuit can meet the requirements of different applications, and the lighting device is more flexible in use.
In addition, according to embodiments 1-2 of the present invention, the dimming control circuit of the led constant current driving circuit may be a pulse width modulation dimming circuit, a resistive dimming circuit, and a voltage dimming circuit. Therefore, the light-emitting diode constant-current driving circuit can support a plurality of dimming mechanisms, and can be applied to different environments so as to meet the requirements of practical application.
Furthermore, according to embodiments 1-2 of the present invention, the light emitting diode constant current driving circuit has a sensing circuit, which may be a microwave sensor or an infrared sensor. Therefore, the light-emitting diode constant current driving circuit can support different sensors so as to meet the requirements of various intelligent applications.
Furthermore, according to embodiments 1-2 of the present invention, the circuit design of the constant current driving circuit of the light emitting diode is simple, and the desired effect can be achieved without greatly increasing the cost. Therefore, the practicability of the light-emitting diode constant current driving circuit can be effectively improved. From the above, the constant current driving circuit of the light emitting diode according to embodiments 1-2 of the present invention can achieve excellent technical effects.
Fig. 3 is a block diagram of a wide voltage adaptive led constant current driving circuit according to embodiment 3 of the present invention. As shown in the figure, the light emitting diode constant current driving circuit 1 includes an input circuit 11, a power factor correction circuit 12, a power factor control circuit 13, a step-down power circuit 14, a step-down control circuit 15, and a power switching circuit 16.
The above components are similar to those of the foregoing embodiments 1-2, and thus are not repeated here. Unlike embodiments 1-2, the light emitting diode constant current driving circuit 1 further includes an auxiliary power supply circuit 17, an induction circuit 18, and a dimming control circuit 19.
The auxiliary power supply circuit 17 is connected to the power factor correction circuit 12. The auxiliary power supply circuit 17 receives the driving signal Ds of the power factor correction circuit 12 to generate the power supply signal Vs.
The induction circuit 18 is connected to the auxiliary power supply circuit 17. The auxiliary power supply circuit 17 drives the induction circuit 18 by the power supply signal Vs. When the sensing circuit 18 detects a moving object (e.g., a person), the sensing circuit 18 generates a sensing signal Ts. In embodiment 3, the sensing circuit 18 is a microwave sensor, an infrared sensor, or other similar component.
The dimming control circuit 19 is connected to the sensing circuit 18 and the step-down control circuit 15. The dimming control circuit 19 receives the sensing signal Ts to generate a dimming signal Us, and transmits the dimming signal Us to the buck control circuit 15. The buck control circuit 15 adjusts the modulation signal Ms according to the dimming signal Us to adjust the constant current output signal Cs of the buck power circuit 14 (e.g. increase the brightness of the load LD). The dimming control circuit 19 may be a pulse width modulation dimming circuit, a resistive dimming circuit, or a voltage dimming circuit. Therefore, the light-emitting diode constant current driving circuit 1 can support various dimming mechanisms, so that the light-emitting diode constant current driving circuit can be applied to different environments to meet the requirements of practical application.
As can be seen from the above, the led constant current driving circuit 1 has an induction circuit 18, which may be a microwave sensor or an infrared sensor. Therefore, the light-emitting diode constant current driving circuit 1 can support different sensors so as to meet the requirements of various intelligent applications.
Of course, embodiment 3 is only for illustrating the scope of the present invention, and equivalent modifications or variations of the wide voltage adaptive light emitting diode constant current driving circuit according to embodiment 3 are still included in the scope of the present invention.
In summary, according to embodiments 1-3 of the present invention, the circuit design of the constant current driving circuit of the light emitting diode can provide the power adjusting function, so that the input circuit can reach a wide voltage input range. Therefore, the light-emitting diode constant current driving circuit can be suitable for various light-emitting diode loads. In addition, the LED constant current driving circuit can achieve high efficiency. Therefore, the LED constant current driving circuit can be widely applied and can accord with the trend of future development.
According to embodiments 1-3 of the present invention, a step-down power circuit of a light emitting diode constant current driving circuit has a detection point, and a power switching circuit thereof includes a power switch. The detection voltage of the detection point generates a first sampling signal through the power switching circuit, and the step-down control circuit generates a modulation signal according to the first sampling signal so as to adjust a constant current output signal of the step-down power circuit. The first sampling signal may be changed by switching a power switch of the power switching circuit. Therefore, the power switch is used for processing the small signal sampled by the detection point, so that the power switch does not need to bear large stress impact. Therefore, the safety and the reliability of the light-emitting diode constant current driving circuit can be greatly improved, and smooth power switching can be realized.
Also, according to embodiments 1 to 3 of the present invention, the power switching circuit of the light emitting diode constant current driving circuit has a power switch. The constant current output signal of the step-down power circuit can be adjusted by a user through a plurality of gears of the power switch. Therefore, the brightness of the lighting device adopting the LED constant current driving circuit can meet the requirements of different applications, and the lighting device is more flexible in use.
In addition, according to embodiments 1-3 of the present invention, the dimming control circuit of the led constant current driving circuit may be a pulse width modulation dimming circuit, a resistive dimming circuit, and a voltage dimming circuit. Therefore, the light-emitting diode constant-current driving circuit can support a plurality of dimming mechanisms, and can be applied to different environments so as to meet the requirements of practical application.
Furthermore, according to embodiments 1-3 of the present invention, the light emitting diode constant current driving circuit has a sensing circuit, which may be a microwave sensor or an infrared sensor. Therefore, the light-emitting diode constant current driving circuit can support different sensors so as to meet the requirements of various intelligent applications.
Furthermore, according to embodiments 1-3 of the present invention, the circuit design of the constant current driving circuit of the light emitting diode is simple, and the desired effect can be achieved without greatly increasing the cost. Therefore, the practicability of the light-emitting diode constant current driving circuit can be effectively improved.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solutions directly or indirectly to other relevant technical fields, all of which are included in the scope of protection of the present patent.
Claims (10)
1. The utility model provides a wide voltage self-adaptation emitting diode constant current drive circuit which characterized in that includes:
an input circuit for receiving an ac voltage input signal to generate a rectified signal;
a power factor correction circuit for receiving the rectified signal to generate a drive signal;
a step-down power circuit for receiving the driving signal to generate a constant current output signal to drive a load, the step-down power circuit having a detection point;
the power switching circuit is used for processing the detection voltage of the detection point to generate a first sampling signal; and
and the voltage reduction control circuit is used for generating a modulation signal according to the first sampling signal so as to adjust the constant current output signal of the voltage reduction power circuit.
2. The wide voltage adaptive led constant current drive circuit of claim 1 further comprising a power factor control circuit for receiving a second sampling signal by the power factor correction circuit to generate a power factor control signal, the power factor correction circuit for adjusting the drive signal in accordance with the power factor control signal.
3. The wide voltage adaptive light emitting diode constant current drive circuit of claim 1, wherein the power switching circuit has a power switch that is switched to vary the first sampling signal.
4. The wide voltage adaptive led constant current drive circuit of claim 1, wherein the buck control circuit is configured to generate the modulation signal based on the first sampling signal and a reference voltage signal.
5. The wide voltage adaptive led constant current drive circuit of claim 1, wherein said modulation signal is a pulse width modulation signal.
6. The wide voltage adaptive led constant current drive circuit of claim 1 further comprising an auxiliary power circuit for receiving the drive signal to generate a power signal to drive the sense circuit, an sense circuit for generating a sense signal, and a dimming control circuit for receiving the sense signal to generate a dimming signal, the buck control circuit for adjusting the modulation signal according to the dimming signal to adjust the constant current output signal of the buck power circuit.
7. The wide-voltage adaptive led constant current drive circuit of claim 6, wherein the sensing circuit is a microwave sensor or an infrared sensor.
8. The wide voltage adaptive led constant current drive circuit of claim 1, wherein the input circuit comprises a rectifying circuit, a filtering circuit, and an anti-surge circuit.
9. The wide voltage adaptive led constant current drive circuit of claim 8, wherein the rectifying circuit is a bridge rectifier.
10. The wide voltage adaptive led constant current drive circuit of claim 1, wherein the load is a led or an array of leds.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310695190.2A CN116437526B (en) | 2023-06-13 | 2023-06-13 | Wide-voltage self-adaptive light-emitting diode constant-current driving circuit |
| JP2023199520A JP7561355B1 (en) | 2023-06-13 | 2023-11-26 | Wide voltage compatible LED constant current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310695190.2A CN116437526B (en) | 2023-06-13 | 2023-06-13 | Wide-voltage self-adaptive light-emitting diode constant-current driving circuit |
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| CN116437526A true CN116437526A (en) | 2023-07-14 |
| CN116437526B CN116437526B (en) | 2023-10-17 |
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| Publication number | Publication date |
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| CN116437526B (en) | 2023-10-17 |
| JP7561355B1 (en) | 2024-10-04 |
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