LED matching module

Abstract

The utility model discloses an LED matching module, comprising a signal separation circuit and a constant current dimming circuit, the signal separation circuit can separate a PWM signal from a DC voltage VB, and the signal separation circuit is electrically connected with the constant current dimming circuit so as to control the magnitude of the output current of the constant current dimming circuit through the PWM signal. An additional control line does not need to be connected to the LED matching module to carry out dimming control on the constant-current LED load, so that the circuit is simplified, and dimming of the constant-voltage LED load and the constant-current LED load can be realized at the same time under one constant-voltage dimming module.

Description

Technical Field

[0001] The utility model relates to the technical field of LED dimming, in particular to an LED matching module. Background Art

[0002] Constant voltage dimming has good dimming characteristics. At present, constant voltage power supply with constant voltage dimming module is mainly used with constant voltage LED load (series resistor on LED lamp) to achieve constant voltage dimming. This dimming method is to achieve the dimming of constant voltage LED load by controlling constant voltage dimming module. However, this method needs to be matched with constant voltage LED load, and cannot achieve constant voltage dimming of constant current LED load (LED lamp without series resistor). In order to achieve the dimming of constant current LED load by constant voltage power supply, the existing technology uses a constant voltage power supply without dimming function to connect DC / DC constant current dimming module and then connect the corresponding constant current LED load. This dimming method is to achieve the dimming of constant current LED load by adjusting DC / DC dimming module. In this way, one DC / DC dimming module is matched with one LED load. If multiple LED loads need to be dimmed, it is necessary to connect additional control lines to multiple DC / DC dimming modules respectively, which makes the circuit more complicated and increases the difficulty of installation and debugging. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide an LED matching module which is suitable for both constant voltage type LED load and constant current type LED load and has a simple circuit and is easy to control.

[0004] According to the LED matching module of the embodiment of the utility model, it includes a signal separation circuit and a constant current dimming circuit. The signal separation circuit can separate a PWM signal from a DC voltage VB. The signal separation circuit is electrically connected to the constant current dimming circuit to control the output current of the constant current dimming circuit through the PWM signal.

[0005] According to the LED matching module of the embodiment of the utility model, the signal separation circuit includes an optocoupler U2 and a switch tube Q3, the input end of the optocoupler U2 inputs the voltage VB through a series resistor, the output end of the optocoupler U2 is electrically connected to the first end of the switch tube Q3, the second end of the switch tube Q3 is electrically connected to the constant current dimming circuit, and the third end of the switch tube Q3 is grounded.

[0006] According to the LED matching module of the embodiment of the utility model, the signal separation circuit includes a switch tube Q4 and a switch tube Q5, the first end of the switch tube Q4 inputs the voltage VB through a series resistor, the second end of the switch tube Q4 is electrically connected to the first end of the switch tube Q3, the second end of the switch tube Q5 is electrically connected to the constant current dimming circuit, and the third end of the switch tube Q5 and the third end of the switch tube Q4 are grounded respectively.

[0007] According to the LED matching module of the embodiment of the utility model, the signal separation circuit includes a switch tube Q6, a switch tube Q7 and a switch tube Q8, the first end of the switch tube Q6 is input with the voltage VB via a series resistor, the third end of the switch tube Q6 is electrically connected to the second end of the switch tube Q7, the third end of the switch tube Q7 is electrically connected to the first end of the switch tube Q8, the second end of the switch tube Q8 is electrically connected to the constant current dimming circuit, and the third end of the switch tube Q8 and the third end of the switch tube Q7 are grounded respectively.

[0008] According to the LED matching module of the embodiment of the utility model, the signal separation circuit is integrated into the single chip microcomputer U3.

[0009] According to the LED matching module of the embodiment of the utility model, the constant current dimming circuit includes a DC to DC constant current circuit and a dimming circuit, the voltage VB is input to the input end of the DC to DC constant current circuit, the PWM signal is input to one end of the dimming circuit, the output end of the dimming circuit is electrically connected to the DC to DC constant current circuit to control the magnitude of the output current of the DC to DC constant current circuit, and the output end of the DC to DC constant current circuit is electrically connected to both ends of the constant current type LED load.

[0010] According to the LED matching module of the embodiment of the utility model, it also includes a multi-stage current control circuit, which is electrically connected to the constant current dimming circuit to control the output of multiple stages of current, and the multi-stage current control circuit includes a dial circuit and an NFC circuit.

[0011] According to the LED matching module of the embodiment of the utility model, it includes a rectifier circuit and a third power supply circuit. The input end of the rectifier circuit inputs a voltage VB, one end of the third power supply circuit is electrically connected to the output end of the rectifier circuit, and the other end of the third power supply circuit is electrically connected to the signal separation circuit to supply power to the signal separation circuit.

[0012] The LED matching module according to the embodiment of the utility model has at least the following beneficial effects: since the signal separation circuit can separate the PWM signal from the DC voltage VB, and the constant voltage dimming module can output the DC voltage VB, the output current of the constant current dimming circuit can be controlled by the PWM signal without affecting the dimming control of the constant voltage LED load by the constant voltage dimming module, thereby realizing the dimming of the constant current LED load; that is, there is no need to connect an additional control line to the LED matching module to perform dimming control on the constant current LED load, which simplifies the circuit, and can simultaneously realize the dimming of the constant voltage LED load and the constant current LED load under one constant voltage dimming module.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings;

[0015] Figure 1 This is the principle block diagram of the matching between LED matching module and constant voltage dimming module;

[0016] Figure 2 This is the principle block diagram of the LED matching module;

[0017] Figure 3 This is one of the circuit schematics of the signal separation circuit in the LED matching module;

[0018] Figure 4 This is the second circuit schematic diagram of the signal separation circuit in the LED matching module;

[0019] Figure 5 This is the third circuit schematic diagram of the signal separation circuit in the LED matching module;

[0020] Figure 6 It is the fourth circuit schematic diagram of the signal separation circuit in the LED matching module;

[0021] Figure 7 is a circuit schematic diagram of an embodiment of an LED matching module. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] Reference Figures 1 to 7 The utility model discloses an LED matching module, including a signal separation circuit 21 and a constant current dimming circuit 22. The signal separation circuit 21 can separate a PWM signal from the output voltage VB of the constant voltage dimming module. The signal separation circuit 21 is electrically connected to the constant current dimming circuit 22 to control the magnitude of the output current of the constant current dimming circuit 22 through the PWM signal. Since the signal separation circuit 21 can separate the PWM signal from the output voltage VB of the constant voltage dimming module, the magnitude of the output current of the constant current dimming circuit 22 can be controlled through the PWM signal, thereby realizing the dimming of the constant current LED load; at the same time, it does not affect the dimming control of the constant voltage LED load by the constant voltage dimming module; that is, there is no need to connect an additional control line to the LED matching module to perform dimming control on the constant current LED load, which simplifies the circuit, and can simultaneously realize the dimming of the constant voltage LED load and the constant current LED load under one constant voltage dimming module.

[0026] like Figure 1 In some embodiments, there are multiple LED matching modules, and the input ends of the multiple LED matching modules are electrically connected to the output ends of the constant voltage dimming module respectively, and the output ends of the multiple LED matching modules are electrically connected to the multiple constant current LED loads one by one. There is no need to connect multiple control lines to the multiple LED matching modules to dim the constant current LED loads, which significantly simplifies the circuit.

[0027] like Figures 2 to 7The LED matching module includes a signal separation circuit 21, a constant current dimming circuit 22, a rectifier circuit 24 and a third power supply circuit 23, wherein the third power supply circuit 23 and the rectifier circuit 24 both adopt the existing technology, and the third power supply circuit 23 steps down the rectified voltage to supply power to the signal separation circuit 21. The input end of the rectifier circuit 24 is electrically connected to the output end of the constant voltage dimming module, one end of the third power supply circuit 23 is electrically connected to the rectifier circuit 24, and the other end of the third power supply circuit 23 is electrically connected to the signal separation circuit 21 to provide the signal separation circuit 21 with a working voltage. The signal separation circuit 21 can separate a PWM signal from the voltage VB, and the output end of the signal separation circuit 21 is electrically connected to the constant current dimming circuit 22 to control the output current of the constant current dimming circuit 22 through the PWM signal. The output end of the constant current dimming circuit 22 is electrically connected to the constant current type LED load, thereby realizing the dimming of the constant current type LED load at the same time.

[0028] like Figure 3 As shown, in some embodiments, the signal separation circuit 21 includes an optocoupler U2 and a switch tube Q3, the positive input end of the optocoupler U2 is electrically connected to the positive output end of the constant voltage dimming module 10 via a series resistor, the negative input end of the optocoupler U2 is electrically connected to the negative output end of the constant voltage dimming module 10, the negative output end of the optocoupler U2 is electrically connected to the first end of the switch tube Q3, the second end of the switch tube Q3 is electrically connected to the third power supply circuit 23 and the constant current dimming circuit 22 respectively, and the third end of the switch tube Q3 is grounded. That is, a PWM signal with a certain duty cycle is separated from the voltage VB by turning on and off the optocoupler U2 and the switch tube Q3.

[0029] like Figure 4 As shown, in some embodiments, the signal separation circuit 21 includes a switch tube Q4 and a switch tube Q5, the first end of the switch tube Q4 is electrically connected to the positive output end of the constant voltage dimming module 10 through a series resistor, the second end of the switch tube Q4 is electrically connected to the first end of the switch tube Q3 and the third power supply circuit 23, the second end of the switch tube Q5 is electrically connected to the third power supply circuit 23 and the constant current dimming circuit 22, and the third end of the switch tube Q5 and the third end of the switch tube Q4 are grounded. That is, a PWM signal with a certain duty cycle is separated from the voltage VB by turning on and off the switch tubes Q4 and Q5.

[0030] like Figure 5As shown, in some embodiments, the signal separation circuit 21 includes a switch tube Q6, a switch tube Q7 and a switch tube Q8, the first end of the switch tube Q6 is electrically connected to the positive output end of the constant voltage dimming module 10 through a series resistor, the second end of the switch tube Q6 is electrically connected to the negative output end of the constant voltage dimming module 10, the third end of the switch tube Q6 is electrically connected to the second end of the switch tube Q7, the third end of the switch tube Q7 is electrically connected to the third power supply circuit 23 and the first end of the switch tube Q8 respectively, the second end of the switch tube Q8 is electrically connected to the third power supply circuit 23 and the constant current dimming circuit 22 respectively, and the third end of the switch tube Q8 and the third end of the switch tube Q7 are grounded respectively. That is, a PWM signal with a certain duty cycle is separated from the voltage VB by turning on and off the switch tubes Q6, Q7 and Q8.

[0031] like Figure 6 As shown, in some embodiments, the signal separation circuit 21 is integrated into the single chip microcomputer U3, and the circuit in the single chip microcomputer U3 can adopt the above Figures 5 to 7 The circuit structure in the chip has high integration.

[0032] like Figure 7 As shown, in some embodiments, the constant current dimming circuit 22 includes a DC-to-DC constant current circuit 221 and a dimming circuit, wherein the topology of the DC-to-DC constant current circuit 221 can be composed of a buck type (BUCK) and a boost type (BOOST) structure, and the dimming circuit adopts an existing dimming drive circuit. The input end of the DC-to-DC constant current circuit 221 is electrically connected to the output end of the rectifier circuit 24, a PWM signal is input to one end of the dimming circuit, the output end of the dimming circuit is electrically connected to the DC-to-DC constant current circuit 221 to control the magnitude of the output current of the DC-to-DC constant current circuit 221, and the output end of the DC-to-DC constant current circuit 221 is electrically connected to both ends of the constant current type LED load. Figure 7 As shown, the dimming circuit adopts a dimming control chip U4, the DC to DC constant current circuit 221 adopts a BUCK step-down topology, the rectifier circuit 24 is a diode D1, and the third power supply circuit 23 is a step-down circuit composed of a transistor Q9, a resistor and a voltage regulator diode.

[0033] In some embodiments, the constant current dimming circuit 22 uses a constant current dimming chip that integrates a DC to DC constant current circuit 221 and a dimming circuit. The constant current dimming chip is a prior art and will not be described in detail herein.

[0034] In some embodiments, a multi-stage current control circuit 30 is further included. The multi-stage current control circuit 30 is electrically connected to the constant current dimming circuit 22 to control the output of multiple stages of current. The multi-stage current control circuit 30 includes a dial circuit and an NFC circuit.

[0035] It is easy for those skilled in the art to understand that the above preferred embodiments can be freely combined and superimposed without conflict.

[0036] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An LED matching module, characterized in that: include: A signal separation circuit (21) and a constant current dimming circuit (22), wherein the signal separation circuit (21) can separate a PWM signal from a DC voltage VB, and the signal separation circuit (21) is electrically connected to the constant current dimming circuit (22) to control the magnitude of the output current of the constant current dimming circuit (22) through the PWM signal.

2. The LED matching module according to claim 1, wherein: The signal separation circuit (21) includes an optocoupler U2 and a switch tube Q3, wherein the input end of the optocoupler U2 inputs the voltage VB via a series resistor, the output end of the optocoupler U2 is electrically connected to the first end of the switch tube Q3, the second end of the switch tube Q3 is electrically connected to the constant current dimming circuit (22), and the third end of the switch tube Q3 is grounded.

3. The LED matching module according to claim 1, wherein: The signal separation circuit (21) includes a switch tube Q4 and a switch tube Q5, wherein the first end of the switch tube Q4 inputs the voltage VB via a series resistor, the second end of the switch tube Q4 is electrically connected to the first end of the switch tube Q3, the second end of the switch tube Q5 is electrically connected to the constant current dimming circuit (22), and the third end of the switch tube Q5 and the third end of the switch tube Q4 are grounded respectively.

4. The LED matching module according to claim 1, wherein: The signal separation circuit (21) includes a switch tube Q6, a switch tube Q7, and a switch tube Q8. The first end of the switch tube Q6 inputs the voltage VB via a series resistor. The third end of the switch tube Q6 is electrically connected to the second end of the switch tube Q7. The third end of the switch tube Q7 is electrically connected to the first end of the switch tube Q8. The second end of the switch tube Q8 is electrically connected to the constant current dimming circuit (22). The third end of the switch tube Q8 and the third end of the switch tube Q7 are grounded respectively.

5. The LED matching module according to any one of claims 2 to 4, characterized in that: The signal separation circuit (21) is integrated into the single chip microcomputer U3.

6. The LED matching module according to claim 1, wherein: The constant current dimming circuit (22) comprises a DC-to-DC constant current circuit (221) and a dimming circuit; the voltage VB is input to the input end of the DC-to-DC constant current circuit (221); the PWM signal is input to one end of the dimming circuit; the output end of the dimming circuit is electrically connected to the DC-to-DC constant current circuit (221) to control the magnitude of the output current of the DC-to-DC constant current circuit (221); and the output end of the DC-to-DC constant current circuit (221) is electrically connected to two ends of a constant current type LED load.

7. The LED matching module according to claim 1, characterized in that: It also includes a multi-segment current control circuit (30), which is electrically connected to the constant current dimming circuit (22) to control the output of multiple currents, and the multi-segment current control circuit (30) includes a dial circuit and an NFC circuit.

8. The LED matching module according to claim 1, wherein: The invention comprises a rectifier circuit (24) and a third power supply circuit (23), wherein the input end of the rectifier circuit (24) inputs a voltage VB, one end of the third power supply circuit (23) is electrically connected to the output end of the rectifier circuit (24), and the other end of the third power supply circuit (23) is electrically connected to the signal separation circuit (21) to supply power to the signal separation circuit (21).

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