Circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines

Abstract

The present invention relates to a circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines, comprising: an adjustable voltage switching power supply, an adjustable voltage control switch, a single set of power supply lines, a detection and control module, and two or more LED lights; the adjustable voltage control switch controls the output voltage of the adjustable voltage switching power supply, and the single set of power supply lines transmits the output voltage of the adjustable voltage switching power supply to the detection and control module; the detection and control module detects the output voltage of the single set of power supply lines and switches and controls the connection of a corresponding one of the LED lights to the single set of power supply lines according to the output voltage. The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines disclosed by the present invention can realize the switching control between multiple LED lights only by a single set of power supply lines.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lights, and particularly to a circuit for realizing switching control of multiple LED lights based on a single set of power supply lines. Background Art

[0002] At present, the lifting lights on the market include two LED lights, namely a main LED light and a secondary LED light. Among them, the main LED light is a white LED light, and the secondary LED light is a red and blue flashing LED light. Most of the lifting lights on the market are controlled by a four-wire system (two sets of power supply lines). One set of power supply lines supplies power to the main LED light alone, and the other set of power supply lines supplies power to the secondary LED light alone.

[0003] However, in order to adapt to the lifting function of the lifting light, the power supply lines of the lifting light are all in a spring shape, so the power supply lines need to occupy a large space inside the lamp post. Moreover, the two-group power supply line (four-wire system) control method consumes a large amount of wire, and the overall weight of the lamp body is relatively heavy. The heavy weight of the lamp body increases the installation difficulty of the lifting light. Summary of the Invention

[0004] An object of the present invention is to overcome the deficiencies in the prior art and provide a circuit for realizing switching control of multiple LED lights based on a single set of power supply lines, which can realize switching control between multiple LED lights only with one set of power supply lines.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] A circuit for realizing switching control of multiple LED lights based on a single set of power supply lines includes: an adjustable voltage switching power supply, an adjustable voltage control switch, a single set of power supply lines, a detection and control module, and two or more LED lights;

[0007] The adjustable voltage control switch controls the output voltage of the adjustable voltage switching power supply, and the single set of power supply lines transmits the output voltage of the adjustable voltage switching power supply to the detection and control module;

[0008] The detection and control module detects the output voltage of the single set of power supply lines and switches and controls the connection of a corresponding one of the LED lights to the single set of power supply lines according to the output voltage.

[0009] In one embodiment, the circuit for realizing switching control of multiple LED lights based on a single set of power supply lines includes a main LED light and a secondary LED light; the main LED light is connected to the single set of power supply lines;

[0010] The secondary LED light is connected to the single set of power supply lines through the detection and control module.

[0011] In one embodiment, the detection and control module includes: a voltage detection unit, a single-chip microcomputer, and a single-chip microcomputer power supply unit; the single-chip microcomputer power supply unit draws power from the single-group power supply line, converts the voltage, and supplies power to the single-chip microcomputer; the voltage detection unit detects the output voltage of the single-group power supply line and transmits the output voltage to the single-chip microcomputer; the single-chip microcomputer outputs a corresponding control signal to the auxiliary LED lamp according to the magnitude of the output voltage.

[0012] In one embodiment, the single-chip microcomputer power supply unit includes: a voltage regulator chip U11, a triode Q8, a zener diode ZD9, a capacitor C98, and a resistor R87;

[0013] The collector of the triode Q8 is connected to the single-group power supply line, and the emitter is connected to a 15V voltage; the resistor R87 is connected in parallel between the collector and the base of the triode Q8; the base of the triode Q8 is also connected to the negative electrode of the zener diode ZD9, and the positive electrode of the zener diode ZD9 is grounded; the emitter of the triode Q8 is also connected in series with the capacitor C98 and then grounded; the power input terminal of the voltage regulator chip U11 is connected to the emitter of the triode Q8, and the output terminal of the voltage regulator chip U11 is connected to the power input terminal of the single-chip microcomputer.

[0014] In one embodiment, the voltage detection unit includes a resistor R48 and a resistor R49; the resistor R48 and the resistor R49 are connected in series and are connected across the positive output terminal and the negative output terminal of the single-group power supply line; the node between the resistor R48 and the resistor R49 is connected to the voltage detection input terminal of the single-chip microcomputer.

[0015] In one embodiment, the adjustable voltage switching power supply includes: an LED lamp power supply unit, an adjustable voltage switching unit, and a PWM control unit; the voltage output terminal of the LED lamp power supply unit is connected to the single-group power supply line;

[0016] The adjustable voltage switching unit draws power V0 from the positive output terminal of the LED lamp power supply unit; the input control terminal of the adjustable voltage switching unit is connected to the adjustable voltage control switch; the output control terminal of the adjustable voltage switching unit is connected to the input control terminal of the PWM control unit; the output control terminal of the PWM control unit is connected to the current control terminal of the LED lamp power supply unit.

[0017] In one embodiment, the adjustable voltage switching unit includes: an operational amplifier U3A, a capacitor C88, a capacitor C100, a diode D10, a resistor R54, a resistor R55, a resistor R56, a resistor R90, and a switch K1;

[0018] One end of the resistor R55 takes power V0 from the positive output terminal of the LED lamp power supply unit, and the other end is connected to the inverting input terminal of the operational amplifier U3A; the inverting input terminal of the operational amplifier U3A is also grounded through the series-connected resistor R54; the inverting input terminal of the operational amplifier U3A is also grounded through the series-connected resistor R56 and switch K1 in sequence; the inverting input terminal of the operational amplifier U3A is also connected to the output terminal of the operational amplifier U3A through the series-connected resistor R90 and capacitor C100 in sequence; one end of the capacitor C88 is connected to the inverting input terminal of the operational amplifier U3A, and the other end is connected to the output terminal of the operational amplifier U3A;

[0019] The non-inverting input terminal of the operational amplifier U3A is connected to a reference voltage; the output terminal of the operational amplifier U3A is connected to the negative electrode of the diode D10, and the positive electrode of the diode D10 is connected to the input control terminal of the PWM control unit.

[0020] In one embodiment, the PWM control unit includes: a resonant PWM controller U2, an optocoupler U4, a resistor R27, a resistor R28, a resistor R30, a resistor R32, a resistor R33, a resistor R34, a resistor R42, a resistor R47, a parallel resistor group, a resistor R51, a diode D6, a zener diode ZD6, a MOS transistor Q2, a capacitor C12, a capacitor C18, a capacitor C19, a capacitor C20, a capacitor C22, a capacitor C38;

[0021] The power input terminal of the optocoupler U4 is connected to the power supply VDD through the series-connected resistor R47; the positive and negative output terminals of the optocoupler U4 are connected across the capacitor C20; the positive output terminal of the optocoupler U4 is also grounded through the series-connected capacitor C22 and resistor R42 in sequence; the negative output terminal of the optocoupler U4 is grounded; the positive output terminal of the optocoupler U4 is also grounded through the series-connected zener diode ZD6; the negative electrode of the zener diode ZD6 is connected to the negative feedback terminal FB of the resonant PWM controller U2 through the series-connected resistor R34;

[0022] The overvoltage protection terminal DEM of the resonant PWM controller U2 is grounded through the series-connected resistor R33, and the capacitor C12 is connected in parallel with the resistor R33; the overvoltage protection terminal DEM of the resonant PWM controller U2 is also connected to the voltage control terminal AUX of the LED lamp power supply unit through the series-connected resistor R32;

[0023] The current detection terminal CS of the resonant PWM controller U2 is grounded through the series-connected capacitor C18; the current detection terminal CS of the resonant PWM controller U2 is also grounded through the series-connected resistor R30 and the parallel resistor group in sequence; the current detection terminal CS of the resonant PWM controller U2 is also connected to the source electrode of the MOS transistor Q2 through the series-connected resistor R30;

[0024] The output control terminal GATE of the resonant PWM controller U2 is connected to the gate of the MOS transistor Q2 after being in series with the resistor R27; the output control terminal GATE of the resonant PWM controller U2 is also connected to the cathode of the diode D6 after being in series with the resistor R51; the anode of the diode D6 is connected to the gate of the MOS transistor Q2; the gate of the MOS transistor Q2 is also grounded after being in series with the resistor R28; a capacitor C38 is connected across the drain and source of the MOS transistor Q2; the drain of the MOS transistor Q2 is connected to the current control terminal of the LED lamp power supply unit as the output control terminal of the PWM control unit;

[0025] The soft start terminal SS of the resonant PWM controller U2 is grounded after being in series with the capacitor C19; the power supply terminal VCC of the resonant PWM controller U2 obtains power from the LED lamp power supply unit.

[0026] In one embodiment, the adjustable voltage switching power supply further includes a constant current unit and a power supply generation unit; the power supply generation unit obtains power from the LED lamp power supply unit and outputs a reference voltage to the voltage input terminal of the constant current unit; the current input terminal of the constant current unit obtains a supply current from the power supply loop of the LED lamp power supply unit and outputs a corresponding current control signal to the input control terminal of the PWM control unit according to the supply current;

[0027] The power supply generation unit also outputs a power supply VDD to the power supply input terminal of the optocoupler U4.

[0028] In one embodiment, the constant current unit includes: a resistor RS1, a resistor R50, a resistor R60, a resistor R46, a resistor R57, a capacitor C21, a capacitor C13, a diode D11, and an operational amplifier U3B;

[0029] One end of the resistor R50 is connected to the reference voltage output by the power supply generation unit, and the other end of the resistor R50 is connected to the non-inverting input terminal of the operational amplifier U3B; the non-inverting input terminal of the operational amplifier U3B is also grounded after being in series with the resistor R60; the non-inverting input terminal of the operational amplifier U3B is also connected to the output terminal of the operational amplifier U3B after being in series with the resistor R57 and the capacitor C13 in sequence;

[0030] The resistor RS1 is connected in series in the loop of the LED lamp power supply unit to detect the supply current of the LED lamp power supply unit;

[0031] The resistor RS1 is connected to the inverting input terminal of the operational amplifier U3B after being in series with the resistor R46; the inverting input terminal of the operational amplifier U3B is also grounded after being in series with the capacitor C21;

[0032] The output terminal of the operational amplifier U3B is connected to the negative electrode of the diode D11, and the positive electrode of the diode D11 is connected to the input control terminal of the PWM control unit.

[0033] The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines provided by the present invention can realize the switching control of the main and secondary LED lights only through a single set of power supply lines; reduce the consumption of wires, reduce the overall weight of the lamp body, and thus reduce the installation difficulty of the LED lights;

[0034] The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines of the present invention also ensures that the LED lights operate at a constant current; with high stability;

[0035] The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines of the present invention also ensures that the LED lights operate at a constant voltage; with high stability;

[0036] The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines of the present invention does not require an additional auxiliary power supply, has a low implementation cost, and has a simple structure. Brief Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic block diagram of the circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines of the present invention;

[0039] Figure 2 It is a schematic connection diagram of an adjustable voltage switching power supply and a single-wire power supply line;

[0040] Figure 3 It is a schematic diagram of the principle of the LED lamp power supply unit and the power supply generation unit;

[0041] Figure 4 It is a schematic circuit diagram of the PWM control unit;

[0042] Figure 5 It is a schematic circuit diagram of the constant current unit;

[0043] Figure 6 It is a schematic circuit diagram of the adjustable voltage switching unit;

[0044] Figure 7It is the circuit schematic diagram of the main LED lamp, the detection control module and the auxiliary LED lamp. Specific embodiments

[0045] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0046] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0048] As Figure 1 shown, the present invention discloses a circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines, including: an adjustable voltage switching power supply 10, an adjustable voltage control switch 20, a single set of power supply lines 30, a detection control module 40 and two or more LED lamps. The adjustable voltage control switch 20 controls the output voltage of the adjustable voltage switching power supply 10, and the single set of power supply lines 30 transmits the output voltage of the adjustable voltage switching power supply 10 to the detection control module 40. The detection control module 40 detects the output voltage of the single set of power supply lines 30 and switches and controls the connection of a corresponding LED lamp to the single set of power supply lines 30 according to the output voltage. In this embodiment, it includes a main LED lamp 50 and an auxiliary LED lamp 60; the main LED lamp 50 is connected to the single set of power supply lines 30; the auxiliary LED lamp 60 is connected to the single set of power supply lines 30 through the detection control module 40.

[0049] As Figure 7As shown in the figure, in this embodiment, the detection and control module 40 includes: a voltage detection unit, a single-chip microcomputer, and a single-chip microcomputer power supply unit. The single-chip microcomputer power supply unit draws power from the single-group power supply line 30, converts the voltage, and supplies power to the single-chip microcomputer. The voltage detection unit detects the output voltage of the single-group power supply line 30 and transmits the output voltage to the single-chip microcomputer. The single-chip microcomputer outputs a corresponding control signal to the auxiliary LED lamp 60 according to the magnitude of the output voltage.

[0050] As Figure 7 shown in the figure, in this embodiment, the single-chip microcomputer power supply unit includes: a voltage regulator chip U11, a triode Q8, a zener diode ZD9, a capacitor C98, and a resistor R87. The collector of the triode Q8 is connected to the single-group power supply line 30, and the emitter is connected to a 15V voltage. A resistor R87 is connected across the collector and the base of the triode Q8. The base of the triode Q8 is also connected to the negative electrode of the zener diode ZD9, and the positive electrode of the zener diode ZD9 is grounded. The emitter of the triode Q8 is also connected in series with the capacitor C98 and then grounded. The power input terminal of the voltage regulator chip U11 is connected to the emitter of the triode Q8, and the output terminal of the voltage regulator chip U11 is connected to the power input terminal of the single-chip microcomputer.

[0051] As Figure 7 shown in the figure, in this embodiment, the voltage detection unit includes a resistor R48 and a resistor R49; the resistor R48 and the resistor R49 are connected in series and are connected across the positive output terminal and the negative output terminal of the single-group power supply line 30; the node between the resistor R48 and the resistor R49 is connected to the voltage detection input terminal of the single-chip microcomputer.

[0052] As Figure 2 shown in the figure, in this embodiment, the adjustable voltage switching power supply 10 includes: an LED lamp power supply unit 70, an adjustable voltage switching unit 80, and a PWM control unit 90. The voltage output terminal of the LED lamp power supply unit 70 is connected to the single-group power supply line 30. The adjustable voltage switching unit 80 draws power V0 from the positive output terminal of the LED lamp power supply unit 70. The input control terminal of the adjustable voltage switching unit 80 is connected to the adjustable voltage control switch 20. The output control terminal of the adjustable voltage switching unit 80 is connected to the input control terminal of the PWM control unit 90. The output control terminal of the PWM control unit 90 is connected to the current control terminal of the LED lamp power supply unit 70.

[0053] As Figure 6 shown in the figure, in this embodiment, the adjustable voltage switching unit 80 includes: an operational amplifier U3A, a capacitor C88, a capacitor C100, a diode D10, a resistor R54, a resistor R55, a resistor R56, a resistor R90, and a switch K1.

[0054] As Figure 6As shown, one end of resistor R55 takes power V0 from the positive output terminal of the LED lamp power supply unit 70, and the other end is connected to the inverting input terminal of operational amplifier U3A. The inverting input terminal of operational amplifier U3A is also grounded through series resistor R54. The inverting input terminal of operational amplifier U3A is also grounded through series resistors R56 and switch K1 in sequence. The inverting input terminal of operational amplifier U3A is also connected to the output terminal of operational amplifier U3A through series resistors R90 and capacitor C100 in sequence. One end of capacitor C88 is connected to the inverting input terminal of operational amplifier U3A, and the other end is connected to the output terminal of operational amplifier U3A. The non-inverting input terminal of operational amplifier U3A is connected to the reference voltage of 2.5V; the output terminal of operational amplifier U3A is connected to the negative electrode of diode D10, and the positive electrode of diode D10 is connected to the input control terminal of the PWM control unit 90.

[0055] As Figure 4 shown, in this embodiment, the PWM control unit 90 includes: resonant PWM controller U2, optocoupler U4, resistor R27, resistor R28, resistor R30, resistor R32, resistor R33, resistor R34, resistor R42, resistor R47, parallel resistor group, resistor R51, diode D6, zener diode ZD6, MOS transistor Q2, capacitor C12, capacitor C18, capacitor C19, capacitor C20, capacitor C22, capacitor C38;

[0056] As Figure 4 shown, the power input terminal of optocoupler U4 is connected to the power supply VDD through series resistor R47; the positive and negative output terminals of optocoupler U4 are connected across capacitor C20; the positive output terminal of optocoupler U4 is also grounded through series capacitors C22 and resistor R42 in sequence; the negative output terminal of optocoupler U4 is grounded; the positive output terminal of optocoupler U4 is also grounded through series zener diode ZD6; the negative electrode of zener diode ZD6 is connected to the negative feedback terminal FB of resonant PWM controller U2 through series resistor R34;

[0057] As Figure 4 shown, the overvoltage protection terminal DEM of resonant PWM controller U2 is grounded through series resistor R33, and capacitor C12 is in parallel with resistor R33; the overvoltage protection terminal DEM of resonant PWM controller U2 is also connected to the voltage control terminal AUX of the LED lamp power supply unit 70 through series resistor R32.

[0058] As Figure 4 shown, the current detection terminal CS of resonant PWM controller U2 is grounded through series capacitor C18; the current detection terminal CS of resonant PWM controller U2 is also grounded through series resistors R30 and parallel resistor group in sequence; the current detection terminal CS of resonant PWM controller U2 is also connected to the source electrode of MOS transistor Q2 through series resistor R30.

[0059] As Figure 4As shown, the output control terminal GATE of the resonant PWM controller U2 is connected to the gate of the MOS transistor Q2 after being in series with the resistor R27; the output control terminal GATE of the resonant PWM controller U2 is also connected to the cathode of the diode D6 after being in series with the resistor R51; the anode of the diode D6 is connected to the gate of the MOS transistor Q2; the gate of the MOS transistor Q2 is also grounded after being in series with the resistor R28; a capacitor C38 is connected across the drain and source of the MOS transistor Q2; the drain of the MOS transistor Q2 is connected to the current control terminal of the LED lamp power supply unit 70 as the output control terminal of the PWM control unit 90.

[0060] As Figure 4 shown, the soft start terminal SS of the resonant PWM controller U2 is grounded after being in series with the capacitor C19; the power supply terminal VCC of the resonant PWM controller U2 draws power from the LED lamp power supply unit 70.

[0061] As Figure 3 and Figure 5 shown, in this embodiment, the adjustable voltage switching power supply 10 further includes a constant current unit and a power supply generation unit; the power supply generation unit draws power from the LED lamp power supply unit 70 and outputs a reference voltage of 2.5V to the voltage input terminal of the constant current unit; the current input terminal of the constant current unit obtains the supply current from the supply loop of the LED lamp power supply unit 70 and outputs a corresponding current control signal to the input control terminal of the PWM control unit 90. The power supply generation unit also outputs a power supply VDD to the power supply input terminal of the optocoupler U4.

[0062] As Figure 5 shown, in this embodiment, the constant current unit includes: a resistor RS1, a resistor R50, a resistor R60, a resistor R46, a resistor R57, a capacitor C21, a capacitor C13, a diode D11, and an operational amplifier U3B. One end of the resistor R50 is connected to the reference voltage of 2.5V output by the power supply generation unit, and the other end of the resistor R50 is connected to the non-inverting input terminal of the operational amplifier U3B. The non-inverting input terminal of the operational amplifier U3B is also grounded after being in series with the resistor R60; the non-inverting input terminal of the operational amplifier U3B is also connected to the output terminal of the operational amplifier U3B after being in series with the resistor R57 and the capacitor C13 in sequence. The resistor RS1 is connected in series in the loop of the LED lamp power supply unit 70 to detect the supply current of the LED lamp power supply unit 70.

[0063] As Figure 5 shown, the resistor RS1 is connected to the inverting input terminal of the operational amplifier U3B after being in series with the resistor R46; the inverting input terminal of the operational amplifier U3B is also grounded after being in series with the capacitor C21. The output terminal of the operational amplifier U3B is connected to the cathode of the diode D11, and the anode of the diode D11 is connected to the input control terminal of the PWM control unit 90.

[0064] As Figure 3As shown, in this embodiment, the power supply generating unit includes: resistor R43, resistor R10, capacitor C32, capacitor C28, diode D15, and three-terminal voltage regulator U5; the positive electrode of diode D15 draws power from the LED lamp power supply unit 70, and the negative electrode of diode D15 is grounded after being serially connected with resistor R43 and capacitor C32 in sequence; capacitor C28 is connected in parallel with capacitor C32 and serves as the first output terminal of the power supply generating unit to output the power supply VDD; the first output terminal is serially connected with resistor R10 and then connected to the output terminal of three-terminal voltage regulator U5; the grounding terminal of three-terminal voltage regulator U5 is grounded, and the input terminal is connected to resistor R50.

[0065] As Figure 2 shown, in this embodiment, the LED lamp power supply unit 70 includes a PFC correction circuit 100, a primary circuit 200, a transformer 300, and a secondary circuit 400 that are connected in sequence. The output control terminal of the PWM control unit 90 is connected to the primary circuit 200 to regulate the output current of the primary circuit 200. The current input terminal of the constant current unit obtains the supply current from the power supply loop of the secondary circuit 400.

[0066] The working principle of the circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines is described below (please refer to Figures 1 to 7 together):

[0067] The constant current unit obtains the output current of the LED lamp power supply unit 70 through resistor RS1; when the output current of the LED lamp power supply unit 70 increases, the current flowing through resistor RS1 increases, and the voltage drop across resistor RS1 rises; the output current signal of the LED lamp power supply unit 70 is converted into a corresponding voltage signal through resistor RS1 and resistor R46 and then input to the inverting input terminal of operational amplifier U3B; the non-inverting input terminal of operational amplifier U3B is a stable voltage obtained after the reference voltage of 2.5V is divided.

[0068] When the voltage at the inverting input terminal of operational amplifier U3B is higher than the voltage at the non-inverting input terminal of operational amplifier U3B, the output terminal of operational amplifier U3B outputs a low level; conversely, the output terminal of operational amplifier U3B outputs a high level; that is to say, when the output current of the LED lamp power supply unit 70 increases, the voltage at the inverting input terminal of operational amplifier U3B is higher than the voltage at the non-inverting input terminal of operational amplifier U3B; at this time, the output terminal of operational amplifier U3B outputs a low level, and diode D11 conducts; at this time, the current of optocoupler U4 increases, and the signal fed back to the feedback terminal FB of resonant PWM controller U2 through optocoupler U4 increases, thereby making the PWM pulse width of resonant PWM controller U2 narrower, and further regulating the output current of primary circuit 200 to decrease through the output control terminal GATE of resonant PWM controller U2, so as to achieve the purpose of constant current.

[0069] The circuit for realizing the switching control of multiple LED lights based on a single set of power supply lines in the present invention also ensures that the LED lights operate at a constant current; it has high stability;

[0070] When the adjustable voltage switch unit 80 closes the switch K1, the resistors R54 and R56 are in parallel. At this time, the voltage at the inverting input terminal of the operational amplifier U3A is lower than the reference voltage of 2.5V at its non-inverting input terminal. The output terminal of the operational amplifier U3A outputs a high level, and the diode D10 is not conducting; thus, the current of the optocoupler U4 decreases, and the signal fed back to the feedback terminal FB of the resonant PWM controller U2 through the optocoupler U4 decreases. Furthermore, the PWM pulse width of the resonant PWM controller U2 becomes wider (the voltage duty cycle becomes larger), and then the output current of the primary circuit 200 adjusted by the output control terminal GATE of the resonant PWM controller U2 increases, so as to achieve the purpose of increasing the voltage; the output voltage of the LED lamp power supply unit 70 increases, and the main LED lamp 50 lights up;

[0071] Conversely, when the switch K1 is opened, the resistors R54 and R55 divide the voltage. At this time, the voltage at the inverting input terminal of the operational amplifier U3A is higher than the reference voltage of 2.5V at its non-inverting input terminal. The output terminal of the operational amplifier U3A outputs a low level, and the diode D10 conducts; thus, the current of the optocoupler U4 increases, and the signal fed back to the feedback terminal FB of the resonant PWM controller U2 through the optocoupler U4 increases. Furthermore, the PWM pulse width of the resonant PWM controller U2 becomes narrower (the voltage duty cycle becomes smaller), and then the output current of the primary circuit 200 adjusted by the output control terminal GATE of the resonant PWM controller U2 decreases, so as to achieve the purpose of reducing the voltage; the output voltage of the LED lamp power supply unit 70 decreases, and the main LED lamp 50 goes out;

[0072] It should also be noted that the detection and control module 40 detects the output voltage of the LED lamp power supply unit 70 (i.e., the output voltage of the single set of power supply lines 30) in real time and controls the state of the secondary LED lamp 60 according to the output voltage of the single set of power supply lines 30; specifically:

[0073] The single-chip microcomputer power supply unit obtains the output voltage DC+ of the single set of power supply lines 30, stabilizes the output voltage DC+ and then stabilizes it again through the voltage stabilizing chip U11 and outputs it to the power input terminal of the single-chip microcomputer U12 to supply power to the single-chip microcomputer U12;

[0074] The resistors R48 and R49 detect the output voltage of the single-group power supply line 30 and input the detected output voltage into the single-chip microcomputer; when the output voltage of the single-group power supply line 30 is a high voltage (such as 60V), the single-chip microcomputer outputs a low-level signal to the secondary LED lamp 60, and at this time the secondary LED lamp 60 is turned off; when the output voltage of the single-group power supply line 30 is a low voltage (such as 30V), the single-chip microcomputer outputs a pulse voltage of 0.5Hz to the secondary LED lamp 60, and at this time the secondary LED lamp 60 blinks;

[0075] In this embodiment, the secondary LED lamp 60 includes a blue secondary LED lamp 60 and a red secondary LED lamp 60;

[0076] That is to say, when the output voltage of the single-group power supply line 30 is a high voltage, the main LED lamp 50 is on and the secondary LED lamp 60 is off; when the output voltage of the single-group power supply line 30 is a low voltage, the main LED lamp 50 is off and the secondary LED lamp 60 blinks; thus, the switching control of the main and secondary LED lamps can be realized only through the single-group power supply line 30; the consumption of wire materials is reduced, the overall weight of the lamp body is reduced, and further the installation difficulty of the LED lamp is reduced;

[0077] The adjustable voltage switch unit 80 also detects the output voltage V0 of the secondary circuit 400 in real time; when the output voltage V0 of the secondary circuit 400 increases, the voltage at the reverse input terminal of the operational amplifier U3A is higher than the reference voltage of 2.5V at the non-inverting input terminal. At this time, the output terminal of the operational amplifier U3A outputs a low level, and the diode D10 conducts; thereby increasing the current of the optocoupler U4, and the signal fed back to the feedback terminal FB of the resonant PWM controller U2 through the optocoupler U4 increases, and further the PWM pulse width of the resonant PWM controller U2 becomes narrower (the voltage duty cycle becomes smaller), and further the output current of the primary circuit 200 adjusted by the output control terminal GATE of the resonant PWM controller U2 decreases (the output voltage of the primary circuit 200 decreases), so as to achieve the purpose of stabilizing the voltage;

[0078] The circuit for realizing the switching control of multiple LED lamps based on a single-group power supply line of the present invention also ensures that the LED lamp maintains a constant voltage operation; the stability is high.

[0079] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines, characterized in that, Including: An adjustable voltage switching power supply, an adjustable voltage control switch, a single-group power supply line, a detection and control module, and two or more LED lights; The adjustable voltage control switch controls the output voltage of the adjustable voltage switching power supply, and the single-group power supply line transmits the output voltage of the adjustable voltage switching power supply to the detection and control module; The detection and control module detects the output voltage of the single-group power supply line and switches and controls a corresponding one of the LED lights to be connected to the single-group power supply line according to the output voltage; Including a main LED light and a secondary LED light; The main LED light is connected to the single-group power supply line; The secondary LED light is connected to the single-group power supply line through the detection and control module; The detection and control module includes: a voltage detection unit, a single-chip microcomputer, and a single-chip microcomputer power supply unit; the single-chip microcomputer power supply unit draws power from the single-group power supply line and converts the voltage to supply power to the single-chip microcomputer; the voltage detection unit detects the output voltage of the single-group power supply line and transmits the output voltage to the single-chip microcomputer; the single-chip microcomputer outputs a corresponding control signal to the secondary LED light according to the magnitude of the output voltage; The voltage detection unit includes a resistor R48 and a resistor R49; the resistor R48 and the resistor R49 are connected in series and are connected across the positive output terminal and the negative output terminal of the single-group power supply line; the node between the resistor R48 and the resistor R49 is connected to the voltage detection input terminal of the single-chip microcomputer; The single-chip microcomputer power supply unit obtains the output voltage DC+ of the single-group power supply line, and the resistor R48 and the resistor R49 detect the output voltage of the single-group power supply line and input the detected output voltage into the single-chip microcomputer; when the output voltage of the single-group power supply line is a high voltage, the single-chip microcomputer outputs a low-level signal to the secondary LED light, and at this time the secondary LED light is off; when the output voltage of the single-group power supply line is a low voltage, the single-chip microcomputer outputs a pulse voltage of 0.5 Hz to the secondary LED light, and at this time the secondary LED light blinks; When the output voltage of the single-group power supply line is a high voltage, the main LED light is on and the secondary LED light is off; when the output voltage of the single-group power supply line is a low voltage, the main LED light is off and the secondary LED light blinks.

2. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to claim 1, characterized in that, The single-chip microcomputer power supply unit includes: a voltage regulator chip U11, a triode Q8, a zener diode ZD9, a capacitor C98, and a resistor R87; The collector of the triode Q8 is connected to the single-group power supply line, and the emitter is connected to a 15V voltage; the resistor R87 is connected across the collector and the base of the triode Q8; the base of the triode Q8 is also connected to the negative electrode of the zener diode ZD9, and the positive electrode of the zener diode ZD9 is grounded; the emitter of the triode Q8 is also connected in series with the capacitor C98 and then grounded; the power input terminal of the voltage regulator chip U11 is connected to the emitter of the triode Q8, and the output terminal of the voltage regulator chip U11 is connected to the power input terminal of the single-chip microcomputer.

3. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to any one of claims 1 to 2, characterized in that, The adjustable voltage switching power supply includes: an LED lamp power supply unit, an adjustable voltage switching unit, and a PWM control unit; the voltage output terminal of the LED lamp power supply unit is connected to the single-group power supply line; The adjustable voltage switching unit draws power V0 from the positive output terminal of the LED lamp power supply unit; the input control terminal of the adjustable voltage switching unit is connected to the adjustable voltage control switch; the output control terminal of the adjustable voltage switching unit is connected to the input control terminal of the PWM control unit; the output control terminal of the PWM control unit is connected to the current control terminal of the LED lamp power supply unit.

4. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to claim 3, characterized in that, The adjustable voltage switching unit includes: operational amplifier U3A, capacitor C88, capacitor C100, diode D10, resistor R54, resistor R55, resistor R56, resistor R90, and switch K1; One end of the resistor R55 draws power V0 from the positive output terminal of the LED lamp power supply unit, and the other end is connected to the inverting input terminal of the operational amplifier U3A; the inverting input terminal of the operational amplifier U3A is also grounded through the series connection of the resistor R54; the inverting input terminal of the operational amplifier U3A is also grounded through the series connection of the resistor R56 and the switch K1 in sequence; the inverting input terminal of the operational amplifier U3A is also connected to the output terminal of the operational amplifier U3A through the series connection of the resistor R90 and the capacitor C100 in sequence; one end of the capacitor C88 is connected to the inverting input terminal of the operational amplifier U3A, and the other end is connected to the output terminal of the operational amplifier U3A; The non-inverting input terminal of the operational amplifier U3A is connected to the reference voltage; the output terminal of the operational amplifier U3A is connected to the negative electrode of the diode D10, and the positive electrode of the diode D10 is connected to the input control terminal of the PWM control unit.

5. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to claim 3, characterized in that, The PWM control unit includes: resonant PWM controller U2, optocoupler U4, resistor R27, resistor R28, resistor R30, resistor R32, resistor R33, resistor R34, resistor R42, resistor R47, parallel resistor group, resistor R51, diode D6, zener diode ZD6, MOS transistor Q2, capacitor C12, capacitor C18, capacitor C19, capacitor C20, capacitor C22, capacitor C38; The power input terminal of the optocoupler U4 is connected to the power supply VDD through the series connection of the resistor R47; the positive and negative output terminals of the optocoupler U4 are connected across the capacitor C20; the positive output terminal of the optocoupler U4 is also grounded through the series connection of the capacitor C22 and the resistor R42 in sequence; the negative output terminal of the optocoupler U4 is grounded; the positive output terminal of the optocoupler U4 is also grounded through the series connection of the zener diode ZD6; the negative electrode of the zener diode ZD6 is connected to the negative feedback terminal FB of the resonant PWM controller U2 through the series connection of the resistor R34; The overvoltage protection terminal DEM of the resonant PWM controller U2 is grounded through the series connection of the resistor R33, and the capacitor C12 is connected in parallel with the resistor R33; the overvoltage protection terminal DEM of the resonant PWM controller U2 is also connected to the voltage control terminal AUX of the LED lamp power supply unit through the series connection of the resistor R32; The current detection terminal CS of the resonant PWM controller U2 is grounded after being connected in series with the capacitor C18; the current detection terminal CS of the resonant PWM controller U2 is also grounded after being connected in series with the resistor R30 and the parallel resistor group in sequence; the current detection terminal CS of the resonant PWM controller U2 is also connected to the source electrode of the MOS transistor Q2 after being connected in series with the resistor R30; The output control terminal GATE of the resonant PWM controller U2 is connected to the gate electrode of the MOS transistor Q2 after being connected in series with the resistor R27; the output control terminal GATE of the resonant PWM controller U2 is also connected to the negative electrode of the diode D6 after being connected in series with the resistor R51; the positive electrode of the diode D6 is connected to the gate electrode of the MOS transistor Q2; the gate electrode of the MOS transistor Q2 is also grounded after being connected in series with the resistor R28; a capacitor C38 is connected across the drain and source electrodes of the MOS transistor Q2; the drain electrode of the MOS transistor Q2 is used as the output control terminal of the PWM control unit and is connected to the current control terminal of the LED lamp power supply unit; The soft start terminal SS of the resonant PWM controller U2 is grounded after being connected in series with the capacitor C19; the power supply terminal VCC of the resonant PWM controller U2 obtains power from the LED lamp power supply unit.

6. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to claim 3, characterized in that, The adjustable voltage switching power supply further includes a constant current unit and a power supply generation unit; the power supply generation unit obtains power from the LED lamp power supply unit and outputs a reference voltage to the voltage input terminal of the constant current unit; the current input terminal of the constant current unit obtains a supply current from the supply loop of the LED lamp power supply unit and outputs a corresponding current control signal to the input control terminal of the PWM control unit according to the supply current; The power supply generation unit also outputs a power supply VDD to the power supply input terminal of the optocoupler U4.

7. The circuit for realizing multi-channel LED lamp switching control based on a single set of power supply lines according to claim 6, characterized in that, The constant current unit includes: a resistor RS1, a resistor R50, a resistor R60, a resistor R46, a resistor R57, a capacitor C21, a capacitor C13, a diode D11, and an operational amplifier U3B; One end of the resistor R50 is connected to the reference voltage output by the power supply generation unit, and the other end of the resistor R50 is connected to the non-inverting input terminal of the operational amplifier U3B; the non-inverting input terminal of the operational amplifier U3B is also grounded after being connected in series with the resistor R60; the non-inverting input terminal of the operational amplifier U3B is also connected to the output terminal of the operational amplifier U3B after being connected in series with the resistor R57 and the capacitor C13 in sequence; The resistor RS1 is connected in series in the loop of the LED lamp power supply unit to detect the supply current of the LED lamp power supply unit; The resistor RS1 is connected to the inverting input terminal of the operational amplifier U3B after being connected in series with the resistor R46; the inverting input terminal of the operational amplifier U3B is also grounded after being connected in series with the capacitor C21; The output terminal of the operational amplifier U3B is connected to the negative electrode of the diode D11, and the positive electrode of the diode D11 is connected to the input control terminal of the PWM control unit.

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