Circuit used for LED line lamp and capable of adjusting up-down light-emitting proportion

Abstract

The utility model discloses a circuit capable of adjusting the up-down light-emitting proportion for an LED line lamp, which comprises a constant-voltage output circuit, a dial switch with multi-gear adjustment, a control panel MCU U11 and a multi-path constant-current circuit, the input end of the constant-voltage output circuit is connected with commercial power, and the output end of the constant-voltage output circuit outputs constant voltage; the MCU U11 is a main control unit; the dial switch is connected with the MCU U11, and a circuit of the dial switch is connected with a multi-path detection resistor of which the voltage is detected by the MCU U11 in real time; the multi-path constant current circuit is connected with the MCU U11, and the MCU U11 outputs multiple PWM signals with different proportions by detecting the voltage of the multi-path detection resistor so as to control the multi-path constant current circuit to output currents with different proportions. According to the circuit, different gears are shifted to control the multi-path constant current circuit to output different current proportions, so that the LED light sources correspondingly connected with the constant current circuits emit different lights to realize different brightness proportions.

Description

Technical Field

[0001] The utility model relates to an LED line lamp, in particular to a circuit for adjusting the upper and lower light emission ratios of the LED line lamp. Background Art

[0002] In recent years, linear lights have been widely used in shopping malls, public places, and smart homes. Customers have diversified their demands for linear lights with upper and lower luminous ratios. Generally, upper and lower luminous linear lights have luminous modules installed on the top and bottom of the profile, and then power is supplied to the modules separately to light up the luminous modules.

[0003] However, the current market practice is generally to use two power supplies to drive and light up the upper light-emitting module and the lower light-emitting module respectively, which will result in excessive costs. Or some will use one power supply, but achieve different light-emitting ratios by changing the number of lamp beads in the upper light-emitting module and the lower light-emitting module, but this will increase the number of modules, which is not conducive to the manufacturer's production and increase the customer's SKU. Utility Model Content

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a circuit for LED linear lights with adjustable upper and lower light-emitting ratios. The purpose of designing this circuit is to use a power supply to allow customers to adjust the upper and lower light-emitting ratios by dialing a code, which can save costs, meet the diverse needs of different customers, and reduce customer inventory.

[0005] In order to solve the above technical problems, the utility model is implemented by the following scheme: A circuit for adjusting the upper and lower light-emitting ratio of an LED linear light of the utility model comprises:

[0006] Constant voltage output circuit, the input end is connected to the mains, and the output end is constant voltage output;

[0007] MCU U11, main control unit;

[0008] A dip switch with multiple adjustment levels, the dip switch is connected to the MCU U11, and a multi-channel detection resistor whose voltage is detected in real time by the MCU U11 is connected in the circuit of the dip switch;

[0009] The multi-channel constant current circuit is connected to the MCU U11. The MCU U11 outputs PWM signals of different proportions by detecting the voltages of the multi-channel detection resistors, thereby controlling the multi-channel constant current circuit to output currents of different proportions.

[0010] Furthermore, a bridge rectifier diode BD1 is provided at the power input end of the constant voltage output circuit, the bridge rectifier diode BD1 is connected to the mains, the negative electrode of the output end is grounded, and the positive electrode of the output end is respectively connected to the first pin of the resistor R1, the first pin of the resistor R3, the first pin of the resistor R5, the first pin of the resistor R7, the first pin of the capacitor C2 and the first pin of the first primary coil of the transformer T1;

[0011] The second pin of the resistor R1 is connected to the first pin of the resistor R2, the second pin of the resistor R2 is connected to the first pin of the capacitor C21 and the 3-pin Multi of a constant voltage chip U7, and the second pin of the capacitor C21 is grounded;

[0012] The second pin of the resistor R3 is connected to the first pin of the resistor R4, the second pin of the resistor R4 is connected to the 1st pin VCC of the constant voltage chip U7, the first pin of the capacitor C1, the positive pin of the polar capacitor C4 and the first pin of the resistor R19, and the capacitor C1 and the polar capacitor C4 are connected in parallel and then grounded;

[0013] The second pin of the resistor R19 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the first pin of the resistor R20 and the 4th pin of the second primary coil of the transformer T1, the second pin of the resistor R20 is connected to the first pin of the resistor R21, the second pin of the resistor R21 is connected to the first pin of the resistor R43, the first pin of the capacitor C3 and the 2nd pin FB / OTP of the constant voltage chip U7, the second pin of the resistor R43 and the second pin of the capacitor C3 are connected to each other and grounded;

[0014] The second pin of the resistor R5 is connected to the first pin of the resistor R6, and the second pin of the resistor R6 is connected to the 4th pin CS / PF of the constant voltage chip U7 and the first pin of the resistor R15;

[0015] The second pin of the resistor R7 and the second pin of the capacitor C2 are connected to the cathode of a diode D1, the anode of the diode D1 is connected to the 3rd pin of the first primary coil of the transformer T1 and the drain D of a transistor Q3, the source S of the transistor Q3 is connected to the first pin of the resistor R18, the first pin of the resistor R17, and the second pin of the resistor R15, respectively, the resistor R18 and the resistor R17 are connected in parallel and then grounded;

[0016] The gate G of the transistor Q3 is connected to the first pin of the resistor R42, the second pin of the resistor R42 is connected to the 6-pin Output of the constant voltage chip U7, and a resistor R44 is also connected between the gate G of the transistor Q3 and the source S of the transistor Q3;

[0017] Pin 5 GND of the constant voltage chip U7 is grounded.

[0018] Furthermore, the constant current circuit is provided with two constant current circuits, wherein the current output of the first constant current circuit is controlled by the first constant current control chip U1, and the current output of the second constant current circuit is controlled by the second constant current control chip U2.

[0019] Furthermore, the power input terminal of the first constant current circuit is connected to the first secondary coil of the transformer T1, the 12th pin of the first secondary coil is connected to the positive electrode of the diode D9 and the positive electrode of the diode D10, and the negative electrode of the diode D9 and the negative electrode of the diode D10 are connected to each other and respectively connected to the positive electrode of the polarized capacitor C9, the first end of the resistor R11, the first end of the resistor R30, the first end of the resistor R31, the first end of the capacitor C13, the 1st pin IN of the first constant current control chip U1, the first end of the resistor R22 and the negative electrode of the diode D11;

[0020] Pin 10 of the first secondary coil of the transformer T1 is grounded to GND2 and connected to the negative electrode of the polarized capacitor C9 and the second end of the resistor R11;

[0021] The second end of the resistor R30 is connected to the light receiving end collector of the optocoupler U8 and the base of the NPN transistor Q5. The light receiving end emitter of the optocoupler U8 is grounded GND2 and connected to the emitter of the NPN transistor Q5 and the first end of the resistor R34. The collector of the NPN transistor Q5 is connected to the second end of the resistor R34, the second end of the resistor R31 and the 3rd pin EN / DIM of the first constant current control chip U1.

[0022] The second pin of the capacitor C13 is grounded to GND2;

[0023] The 6th pin VCC of the first constant current control chip U1 is connected to the first end of the capacitor C15, and the second end of the capacitor C15 is grounded to GND2;

[0024] The 5th pin DR of the first constant current control chip U1 is connected to the first end of the resistor R29, the second end of the resistor R29 is connected to the gate G of the transistor Q1, and the 4th pin GND of the first constant current control chip U1 is connected to the ground GND2;

[0025] The source electrode S of the transistor Q1 is connected to the 4th pin GND of the first constant current control chip U1, and the drain electrode D thereof is connected to the positive electrode of the diode D11 and the first end of the inductor L1, the second end of the inductor L1 is connected to the negative electrode of the polar capacitor C11 and the 1st pin of the second coil of the inductor L3, and the positive electrode of the polar capacitor C11 is connected to the second pin of the resistor R22, the 2nd pin RS of the first constant current control chip U1 and the 4th pin of the first coil of the inductor L3;

[0026] Pin 3 of the first coil of the inductor L3 is connected to the positive output interface, and pin 2 of the second coil of the inductor L3 is connected to the Up- interface.

[0027] Furthermore, the power input terminal of the second constant current circuit is connected to the negative terminal of the diode D10;

[0028] The cathode of the diode D10 is respectively connected to the first end of the resistor R38, the first end of the resistor R39, the first end of the capacitor C14, the first end of the resistor R35, the cathode of the diode D12 and the pin 1 IN of the second constant current control chip U2;

[0029] The second end of the resistor R38 is connected to the light receiving end collector of the optocoupler U9 and the base of the NPN transistor Q7. The light receiving end emitter of the optocoupler U9 and the emitter of the NPN transistor Q7 are connected to each other and then grounded to GND2. The second end of the resistor R39 is connected to the collector of the NPN transistor Q7, the 3rd pin EN / DIM of the second constant current control chip U2, and the first end of the resistor R40. The second end of the resistor R40 is connected to the emitter of the NPN transistor Q7.

[0030] The second end of the capacitor C14 is grounded to GND2;

[0031] The second end of the resistor R35 is respectively connected to the 2nd pin RS of the second constant current control chip U2, the positive electrode of the polarized capacitor C12, and the 4th pin of the first coil of the inductor L4;

[0032] The positive terminal of the diode D12 is connected to the second terminal of the inductor L2 and the drain D of the transistor Q2. The second terminal of the inductor L2 is connected to the negative electrode of the polarized capacitor and the second coil 1 pin of the inductor L4.

[0033] The source electrode S of the transistor Q2 is connected to the 4th pin GND of the second constant current control chip U2 and to the ground GND2, and the gate G thereof is connected to the first end of the resistor R41, and the second end of the resistor R41 is connected to the 5th pin DR of the second constant current control chip U2;

[0034] The 6th pin VCC of the second constant current control chip U2 is connected to the first end of the capacitor C20, and the second end of the capacitor C20 is grounded to GND2;

[0035] Pin 3 of the first coil of the inductor L4 is connected to a positive output interface, and pin 2 of the second coil of the inductor L4 is connected to a Down-interface.

[0036] Furthermore, the dip switch (2) has a dip switch circuit, which includes a dip switch K1, and the dip switch K1 has six-way adjustment circuits, wherein the same-side ends of the 1st to 3rd adjustment circuits are all connected to the first detection circuit, the other ends of the three first detection resistors are connected to the 7th pin VD of the MCU U11, the two ends of the 4th adjustment circuit are respectively connected to the first end of the capacitor C19 and to the 8th pin GND of the MCU U11, the second end of the capacitor C19 is connected to the 7th pin VD of the MCU U11, the 5th and 6th adjustment circuits are all connected to the second detection resistors, and the other ends of the two second detection circuits are connected to each other and to the 7th pin VD of the MCU U11;

[0037] The pin 1 VDD of the MCU U11 is respectively connected to the first pin of the capacitor C18 and the pin 3 OUT of the voltage regulator U10, the pin 2 Set is connected to the first end of the resistor R36, the pin 3 P3 is connected to the first end of the resistor R37, and the pin 4 P4 is grounded. The pin 2 in of the voltage regulator U10 is connected to the output circuit of the second secondary coil of the transformer T2 and the first end of a capacitor C16, the second end of the resistor R36 is connected to the positive electrode of the light-emitting end of the optocoupler U8, and the second end of the resistor R37 is connected to the positive electrode of the light-emitting end of the optocoupler U9;

[0038] The second end of the capacitor C16, the GND of the pin 1 of the voltage regulator U10, the second pin of the capacitor C18, the negative electrode of the light-emitting end of U8, and the negative electrode of the light-emitting end of the optocoupler U9 are all connected to the pin 4 P4 of the MCU U11.

[0039] Compared with the prior art, the beneficial effects of the utility model are:

[0040] 1. The utility model provides a circuit for adjusting the upper and lower light-emitting ratio of LED linear lights, which outputs two constant currents under one power supply condition to control the upper and lower light-emitting of the linear lights respectively.

[0041] 2. The utility model is used for the circuit of the LED line lamp with adjustable upper and lower light emission ratio. By turning the DIP switch circuit to different gears, the multi-channel constant current circuit is controlled to output different current ratios, so that the LED light sources corresponding to each constant current circuit emit different brightness.

[0042] 3. The utility model is used for the circuit with adjustable upper and lower light-emitting ratio of LED linear lights, which can control and adjust the brightness ratio of each light-emitting module. The circuit is not only simple in structure, but also can realize the adjustment of the light-emitting ratio of each light-emitting module, which is convenient for users and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 The utility model is a schematic diagram of a circuit for adjusting the upper and lower light emission ratio of an LED linear lamp.

[0044] Figure 2 This is the constant voltage output circuit diagram of the utility model.

[0045] Figure 3 This is the first constant current circuit diagram of the utility model.

[0046] Figure 4 This is the second constant current circuit diagram of the utility model.

[0047] Figure 5 This is the circuit diagram of the DIP switch of the utility model.

[0048] Markings in the accompanying drawings: power supply 1, dip switch 2, upper light-emitting module 3, lower light-emitting module 4. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the utility model. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0050] Embodiment 1: The specific structure of the utility model is as follows:

[0051] Please refer to the attached Figure 1-5 The utility model provides a circuit for adjusting the upper and lower light emission ratio of an LED linear lamp, comprising:

[0052] Constant voltage output circuit, the input end is connected to the mains, and the output end is constant voltage output;

[0053] MCU U11 is the main control unit, which uses the chip model PFS132;

[0054] A DIP switch 2 with multiple adjustment levels, the DIP switch 2 is connected to the MCU U11, and a multi-channel detection resistor whose voltage is detected in real time by the MCU U11 is connected in the circuit of the DIP switch 2;

[0055] The multi-channel constant current circuit is connected to the MCU U11. The MCU U11 outputs PWM signals of different proportions by detecting the voltages of the multi-channel detection resistors, thereby controlling the multi-channel constant current circuit to output currents of different proportions.

[0056] A preferred technical solution of this embodiment: a bridge rectifier diode BD1 is provided at the power input end of the constant voltage output circuit, the bridge rectifier diode BD1 is connected to the mains, the negative electrode of the output end is grounded, and the positive electrode of the output end is respectively connected to the first pin of the resistor R1, the first pin of the resistor R3, the first pin of the resistor R5, the first pin of the resistor R7, the first pin of the capacitor C2 and the 1st pin of the first primary coil of the transformer T1;

[0057] The second pin of the resistor R1 is connected to the first pin of the resistor R2, the second pin of the resistor R2 is connected to the first pin of the capacitor C21 and the 3-pin Multi of a constant voltage chip U7, and the second pin of the capacitor C21 is grounded;

[0058] The second pin of the resistor R3 is connected to the first pin of the resistor R4, the second pin of the resistor R4 is connected to the 1st pin VCC of the constant voltage chip U7, the first pin of the capacitor C1, the positive pin of the polar capacitor C4 and the first pin of the resistor R19, and the capacitor C1 and the polar capacitor C4 are connected in parallel and then grounded;

[0059] The second pin of the resistor R19 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the first pin of the resistor R20 and the 4th pin of the second primary coil of the transformer T1, the second pin of the resistor R20 is connected to the first pin of the resistor R21, the second pin of the resistor R21 is connected to the first pin of the resistor R43, the first pin of the capacitor C3 and the 2nd pin FB / OTP of the constant voltage chip U7, the second pin of the resistor R43 and the second pin of the capacitor C3 are connected to each other and grounded;

[0060] The second pin of the resistor R5 is connected to the first pin of the resistor R6, and the second pin of the resistor R6 is connected to the 4th pin CS / PF of the constant voltage chip U7 and the first pin of the resistor R15;

[0061] The second pin of the resistor R7 and the second pin of the capacitor C2 are connected to the cathode of a diode D1, the anode of the diode D1 is connected to the 3rd pin of the first primary coil of the transformer T1 and the drain D of a transistor Q3, the source S of the transistor Q3 is connected to the first pin of the resistor R18, the first pin of the resistor R17, and the second pin of the resistor R15, respectively, the resistor R18 and the resistor R17 are connected in parallel and then grounded;

[0062] The gate G of the transistor Q3 is connected to the first pin of the resistor R42, the second pin of the resistor R42 is connected to the 6-pin Output of the constant voltage chip U7, and a resistor R44 is also connected between the gate G of the transistor Q3 and the source S of the transistor Q3;

[0063] Pin 5 GND of the constant voltage chip U7 is grounded.

[0064] A preferred technical solution of this embodiment: the constant current circuit is provided with two constant current circuits, wherein the current output of the first constant current circuit is controlled by the first constant current control chip U1, and the current output of the second constant current circuit is controlled by the second constant current control chip U2.

[0065] A preferred technical solution of this embodiment: the power input end of the first constant current circuit is connected to the first secondary coil of the transformer T1, the 12th pin of the first secondary coil is connected to the positive electrode of the diode D9 and the positive electrode of the diode D10, the negative electrode of the diode D9 and the negative electrode of the diode D10 are connected to each other and are respectively connected to the positive electrode of the polar capacitor C9, the first end of the resistor R11, the first end of the resistor R30, the first end of the resistor R31, the first end of the capacitor C13, the 1st pin IN of the first constant current control chip U1, the first end of the resistor R22 and the negative electrode of the diode D11;

[0066] Pin 10 of the first secondary coil of the transformer T1 is grounded to GND2 and connected to the negative electrode of the polarized capacitor C9 and the second end of the resistor R11;

[0067] The second end of the resistor R30 is connected to the light receiving end collector of the optocoupler U8 and the base of the NPN transistor Q5. The light receiving end emitter of the optocoupler U8 is grounded GND2 and connected to the emitter of the NPN transistor Q5 and the first end of the resistor R34. The collector of the NPN transistor Q5 is connected to the second end of the resistor R34, the second end of the resistor R31 and the 3rd pin EN / DIM of the first constant current control chip U1.

[0068] The second pin of the capacitor C13 is grounded to GND2;

[0069] The 6th pin VCC of the first constant current control chip U1 is connected to the first end of the capacitor C15, and the second end of the capacitor C15 is grounded to GND2;

[0070] The 5th pin DR of the first constant current control chip U1 is connected to the first end of the resistor R29, the second end of the resistor R29 is connected to the gate G of the transistor Q1, and the 4th pin GND of the first constant current control chip U1 is connected to the ground GND2;

[0071] The source electrode S of the transistor Q1 is connected to the 4th pin GND of the first constant current control chip U1, and the drain electrode D thereof is connected to the positive electrode of the diode D11 and the first end of the inductor L1, the second end of the inductor L1 is connected to the negative electrode of the polar capacitor C11 and the 1st pin of the second coil of the inductor L3, and the positive electrode of the polar capacitor C11 is connected to the second pin of the resistor R22, the 2nd pin RS of the first constant current control chip U1 and the 4th pin of the first coil of the inductor L3;

[0072] Pin 3 of the first coil of the inductor L3 is connected to the positive output interface, and pin 2 of the second coil of the inductor L3 is connected to the Up- interface.

[0073] A preferred technical solution of this embodiment: the power input terminal of the second constant current circuit is connected to the negative terminal of the diode D10;

[0074] The cathode of the diode D10 is respectively connected to the first end of the resistor R38, the first end of the resistor R39, the first end of the capacitor C14, the first end of the resistor R35, the cathode of the diode D12 and the pin 1 IN of the second constant current control chip U2;

[0075] The second end of the resistor R38 is connected to the light receiving end collector of the optocoupler U9 and the base of the NPN transistor Q7. The light receiving end emitter of the optocoupler U9 and the emitter of the NPN transistor Q7 are connected to each other and then grounded to GND2. The second end of the resistor R39 is connected to the collector of the NPN transistor Q7, the 3rd pin EN / DIM of the second constant current control chip U2, and the first end of the resistor R40. The second end of the resistor R40 is connected to the emitter of the NPN transistor Q7.

[0076] The second end of the capacitor C14 is grounded to GND2;

[0077] The second end of the resistor R35 is respectively connected to the 2nd pin RS of the second constant current control chip U2, the positive electrode of the polarized capacitor C12, and the 4th pin of the first coil of the inductor L4;

[0078] The positive terminal of the diode D12 is connected to the second terminal of the inductor L2 and the drain D of the transistor Q2. The second terminal of the inductor L2 is connected to the negative electrode of the polarized capacitor and the second coil 1 pin of the inductor L4.

[0079] The source electrode S of the transistor Q2 is connected to the 4th pin GND of the second constant current control chip U2 and to the ground GND2, and the gate G thereof is connected to the first end of the resistor R41, and the second end of the resistor R41 is connected to the 5th pin DR of the second constant current control chip U2;

[0080] The 6th pin VCC of the second constant current control chip U2 is connected to the first end of the capacitor C20, and the second end of the capacitor C20 is grounded to GND2;

[0081] Pin 3 of the first coil of the inductor L4 is connected to a positive output interface, and pin 2 of the second coil of the inductor L4 is connected to a Down-interface.

[0082] A preferred technical solution of this embodiment: the dip switch (2) has a dip switch circuit, the dip switch circuit includes a dip switch K1, and the dip switch K1 has six-way adjustment circuits, wherein the same side ends of the 1st to 3rd adjustment circuits are all connected to the first detection circuit, the other ends of the three first detection resistors are connected to the 7th pin VD of the MCU U11, the two ends of the 4th adjustment circuit are respectively connected to the first end of the capacitor C19 and to the 8th pin GND of the MCU U11, the second end of the capacitor C19 is connected to the 7th pin VD of the MCU U11, the 5th and 6th adjustment circuits are all connected to the second detection resistors, and the other ends of the two second detection circuits are connected to each other and to the 7th pin VD of the MCU U11;

[0083] The pin 1 VDD of the MCU U11 is respectively connected to the first pin of the capacitor C18 and the pin 3 OUT of the voltage regulator U10, the pin 2 Set is connected to the first end of the resistor R36, the pin 3 P3 is connected to the first end of the resistor R37, and the pin 4 P4 is grounded. The pin 2 in of the voltage regulator U10 is connected to the output circuit of the second secondary coil of the transformer T2 and the first end of a capacitor C16, the second end of the resistor R36 is connected to the positive electrode of the light-emitting end of the optocoupler U8, and the second end of the resistor R37 is connected to the positive electrode of the light-emitting end of the optocoupler U9;

[0084] The second end of the capacitor C16, the GND of the pin 1 of the voltage regulator U10, the second pin of the capacitor C18, the negative electrode of the light-emitting end of U8, and the negative electrode of the light-emitting end of the optocoupler U9 are all connected to the pin 4 P4 of the MCU U11.

[0085] Embodiment 2:

[0086] Take 2-way constant current power supply as an example, Figure 1 As shown, a circuit board is arranged in the housing of the power supply 1, and the circuit of the utility model is arranged on the circuit board. The upper light-emitting module 3 and the lower light-emitting module 4 are connected to the first constant current circuit and the second constant current circuit respectively.

[0087] In the circuit of this embodiment 2, the first constant current control chip U1 and the second constant current control chip U2 are both MP24894 chips, and the constant voltage chip U7 is IW3627. The constant voltage chip U7 converts the 120-277V voltage into a 60VDC voltage output. The current delivered by the first constant current control chip U1 and the second constant current control chip U2 is a constant current output.

[0088] The MCU U11 of the present invention is used to control the 3-pin EN / DIM of the first constant current control chip U1 and the 3-pin EN / DIM of the second constant current control chip U2 to output different currents in proportion, thereby controlling the brightness ratio of the upper light-emitting module 3 and the lower light-emitting module 4.

[0089] The toggle switch K1 on the dip switch 2 is a 5-speed toggle switch. The toggle switch K1 can realize pin 1, pin 12, pin 2, pin 11, pin 3, pin 10, pin 5, pin 8 and pin 6, pin 7, respectively connected with pin 4 and pin 9, so that the resistor R46 is respectively connected with the first gear resistor R45, the second gear resistor R47, the third gear resistor R52, the fourth gear resistor R53 and the fifth gear resistor R54 to obtain 5 different detection voltages V. Pin 5 of the MCU U11 detects 5 different detection voltages V, and then outputs 5 PWM signals with different combination ratios through the control program burned into the chip. The PWM signals are transmitted to the third pins of the first constant current control chip U1 and the second constant current control chip U2 through the optical coupler U8 and the optical coupler U9, respectively, and then the two constant current circuits are respectively controlled to output corresponding currents, thereby lighting up the upper light-emitting module 3 and the lower light-emitting module 4, so as to achieve different light-emitting ratios of the upper and lower modules.

[0090] In summary, the utility model provides a circuit for an LED line light with an adjustable upper and lower light ratio, which outputs two constant currents under one power supply condition to respectively control the upper and lower light emission of the line light. The utility model provides a circuit for an LED line light with an adjustable upper and lower light ratio, which controls multiple constant current circuits to output different current ratios by turning the DIP switch circuit to different gears, so that the LED light sources corresponding to each constant current circuit emit different brightness. The utility model provides a circuit for an LED line light with an adjustable upper and lower light ratio, which can control and adjust the brightness ratio of each light-emitting module. The circuit is not only simple in structure, but also can realize the adjustment of the light emission ratio of each light-emitting module, which is convenient for users and improves the user experience.

[0091] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A circuit for adjusting the upper and lower light emission ratio of LED linear lights, characterized in that: include: Constant voltage output circuit, the input end is connected to the mains, and the output end is constant voltage output; MCU U11, main control unit; A dip switch (2) with multiple adjustment levels, the dip switch (2) being connected to the MCU U11, and a multi-channel detection resistor whose voltage is detected in real time by the MCU U11 being connected in the circuit of the dip switch (2); The multi-channel constant current circuit is connected to the MCU U11. The MCU U11 outputs PWM signals of different proportions by detecting the voltages of the multi-channel detection resistors, thereby controlling the multi-channel constant current circuit to output currents of different proportions.

2. A circuit for adjusting the up and down light ratio of LED linear lights according to claim 1, characterized in that: A bridge rectifier diode BD1 is provided at the power input end of the constant voltage output circuit. The bridge rectifier diode BD1 is connected to the mains, the negative electrode of the output end is grounded, and the positive electrode of the output end is respectively connected to the first pin of the resistor R1, the first pin of the resistor R3, the first pin of the resistor R5, the first pin of the resistor R7, the first pin of the capacitor C2, and the first pin of the first primary coil of the transformer T1; The second pin of the resistor R1 is connected to the first pin of the resistor R2, the second pin of the resistor R2 is connected to the first pin of the capacitor C21 and the 3-pin Multi of a constant voltage chip U7, and the second pin of the capacitor C21 is grounded; The second pin of the resistor R3 is connected to the first pin of the resistor R4, the second pin of the resistor R4 is connected to the 1st pin VCC of the constant voltage chip U7, the first pin of the capacitor C1, the positive pin of the polar capacitor C4 and the first pin of the resistor R19, and the capacitor C1 and the polar capacitor C4 are connected in parallel and then grounded; The second pin of the resistor R19 is connected to the cathode of the diode D3, the anode of the diode D3 is connected to the first pin of the resistor R20 and the 4th pin of the second primary coil of the transformer T1, the second pin of the resistor R20 is connected to the first pin of the resistor R21, the second pin of the resistor R21 is connected to the first pin of the resistor R43, the first pin of the capacitor C3 and the 2nd pin FB / 0TP of the constant voltage chip U7, the second pin of the resistor R43 and the second pin of the capacitor C3 are connected to each other and grounded; The second pin of the resistor R5 is connected to the first pin of the resistor R6, and the second pin of the resistor R6 is connected to the 4th pin CS / PF of the constant voltage chip U7 and the first pin of the resistor R15; The second pin of the resistor R7 and the second pin of the capacitor C2 are connected to the cathode of a diode D1, the anode of the diode D1 is connected to the 3rd pin of the first primary coil of the transformer T1 and the drain D of a transistor Q3, the source S of the transistor Q3 is connected to the first pin of the resistor R18, the first pin of the resistor R17, and the second pin of the resistor R15, respectively, the resistor R18 and the resistor R17 are connected in parallel and then grounded; The gate G of the transistor Q3 is connected to the first pin of the resistor R42, the second pin of the resistor R42 is connected to the 6-pin Output of the constant voltage chip U7, and a resistor R44 is also connected between the gate G of the transistor Q3 and the source S of the transistor Q3; Pin 5 GND of the constant voltage chip U7 is grounded.

3. A circuit for adjusting the upper and lower light emission ratio of LED linear lights according to claim 2, characterized in that: The constant current circuit is provided with two constant current circuits, wherein the current output of the first constant current circuit is controlled by the first constant current control chip U1, and the current output of the second constant current circuit is controlled by the second constant current control chip U2.

4. A circuit for adjusting the upper and lower light emission ratio of LED linear lights according to claim 3, characterized in that: The power input end of the first constant current circuit is connected to the first secondary coil of the transformer T1, and the 12th pin of the first secondary coil is connected to the positive electrode of the diode D9 and the positive electrode of the diode D10. The negative electrode of the diode D9 and the negative electrode of the diode D10 are connected to each other and are respectively connected to the positive electrode of the polarized capacitor C9, the first end of the resistor R11, the first end of the resistor R30, the first end of the resistor R31, the first end of the capacitor C13, the 1st pin IN of the first constant current control chip U1, the first end of the resistor R22 and the negative electrode of the diode D11; Pin 10 of the first secondary coil of the transformer T1 is grounded to GND2 and connected to the negative electrode of the polarized capacitor C9 and the second end of the resistor R11; The second end of the resistor R30 is connected to the light receiving end collector of the optocoupler U8 and the base of the NPN transistor Q5. The light receiving end emitter of the optocoupler U8 is grounded GND2 and connected to the emitter of the NPN transistor Q5 and the first end of the resistor R34. The collector of the NPN transistor Q5 is connected to the second end of the resistor R34, the second end of the resistor R31 and the 3rd pin EN / DIM of the first constant current control chip U1. The second pin of the capacitor C13 is grounded to GND2; The 6th pin VCC of the first constant current control chip U1 is connected to the first end of the capacitor C15, and the second end of the capacitor C15 is grounded to GND2; The 5th pin DR of the first constant current control chip U1 is connected to the first end of the resistor R29, the second end of the resistor R29 is connected to the gate G of the transistor Q1, and the 4th pin GND of the first constant current control chip U1 is connected to the ground GND2; The source electrode S of the transistor Q1 is connected to the 4th pin GND of the first constant current control chip U1, and the drain electrode D thereof is connected to the positive electrode of the diode D11 and the first end of the inductor L1, the second end of the inductor L1 is connected to the negative electrode of the polar capacitor C11 and the 1st pin of the second coil of the inductor L3, and the positive electrode of the polar capacitor C11 is connected to the second pin of the resistor R22, the 2nd pin RS of the first constant current control chip U1 and the 4th pin of the first coil of the inductor L3; Pin 3 of the first coil of the inductor L3 is connected to the positive output interface, and pin 2 of the second coil of the inductor L3 is connected to the Up- interface.

5. A circuit for adjusting the upper and lower light emission ratio of LED linear lights according to claim 4, characterized in that: The power input terminal of the second constant current circuit is connected to the negative terminal of the diode D10; The cathode of the diode D10 is respectively connected to the first end of the resistor R38, the first end of the resistor R39, the first end of the capacitor C14, the first end of the resistor R35, the cathode of the diode D12 and the pin 1 IN of the second constant current control chip U2; The second end of the resistor R38 is connected to the light receiving end collector of the optocoupler U9 and the base of the NPN transistor Q7. The light receiving end emitter of the optocoupler U9 and the emitter of the NPN transistor Q7 are connected to each other and then grounded to GND2. The second end of the resistor R39 is connected to the collector of the NPN transistor Q7, the 3rd pin EN / DIM of the second constant current control chip U2, and the first end of the resistor R40. The second end of the resistor R40 is connected to the emitter of the NPN transistor Q7. The second end of the capacitor C14 is grounded to GND2; The second end of the resistor R35 is respectively connected to the 2nd pin RS of the second constant current control chip U2, the positive electrode of the polarized capacitor C12, and the 4th pin of the first coil of the inductor L4; The positive terminal of the diode D12 is connected to the second terminal of the inductor L2 and the drain D of the transistor Q2. The second terminal of the inductor L2 is connected to the negative electrode of the polarized capacitor and the second coil 1 pin of the inductor L4. The source electrode S of the transistor Q2 is connected to the 4th pin GND of the second constant current control chip U2 and to the ground GND2, and the gate G thereof is connected to the first end of the resistor R41, and the second end of the resistor R41 is connected to the 5th pin DR of the second constant current control chip U2; The 6th pin VCC of the second constant current control chip U2 is connected to the first end of the capacitor C20, and the second end of the capacitor C20 is grounded to GND2; Pin 3 of the first coil of the inductor L4 is connected to a positive output interface, and pin 2 of the second coil of the inductor L4 is connected to a Down-interface.

6. A circuit for adjusting the up and down light ratio of LED linear lights according to claim 5, characterized in that: The dip switch (2) has a dip switch circuit, which includes a dip switch K1. The dip switch K1 has six regulating circuits, wherein the same-side ends of the 1st to 3rd regulating circuits are all connected to a first detection circuit, the other ends of the three first detection resistors are connected to the 7th pin VD of the MCU U11, the two ends of the 4th regulating circuit are respectively connected to the first end of a capacitor C19 and to the 8th pin GND of the MCU U11, the second end of the capacitor C19 is connected to the 7th pin VD of the MCU U11, the 5th and 6th regulating circuits are all connected to a second detection resistor, and the other ends of the two second detection circuits are connected to each other and to the 7th pin VD of the MCU U11; The pin 1 VDD of the MCU U11 is respectively connected to the first pin of the capacitor C18 and the pin 3 OUT of the voltage regulator U10, the pin 2 Set is connected to the first end of the resistor R36, the pin 3 P3 is connected to the first end of the resistor R37, and the pin 4 P4 is grounded. The pin 2 in of the voltage regulator U10 is connected to the output circuit of the second secondary coil of the transformer T2 and the first end of a capacitor C16, the second end of the resistor R36 is connected to the positive electrode of the light-emitting end of the optocoupler U8, and the second end of the resistor R37 is connected to the positive electrode of the light-emitting end of the optocoupler U9; The second end of the capacitor C16, the GND of the pin 1 of the voltage regulator U10, the second pin of the capacitor C18, the negative electrode of the light-emitting end of U8, and the negative electrode of the light-emitting end of the optocoupler U9 are all connected to the pin 4 P4 of the MCU U11.

Images