Circuit structure of high-voltage RGB point-control LED lamp strip

Abstract

The utility model discloses a circuit structure of a high-voltage RGB point-control LED lamp strip. A power supply circuit comprises an EMC filtering module, the input end of the EMC filtering module is used for being connected with commercial power, the output end of the EMC filtering module is connected to a rectification filtering module, the output end of the rectification filtering module is connected to a chopping transformation module, and the output end of the chopping transformation module is connected to a load circuit; the load circuit comprises a master control module and first to Nth sub-control modules, the chopping transformation module outputs 48V-60V high-voltage direct current to the master control module and the first to Nth sub-control modules, a master control program is stored in the master control module, a control signal of the master control program is transmitted to the first sub-control module, and a control signal of the master control program is transmitted to the second sub-control module. And the signals are sequentially output to the Nth sub-control module through the first sub-control module, so that the first sub-control module to the Nth sub-control module are synchronized.

Description

Technical Field

[0001] The utility model relates to a circuit structure of an LED light strip, and particularly discloses a circuit structure of a high-voltage RGB point-controlled LED light strip. Background Art

[0002] A low-voltage LED light strip refers to an LED light strip with an operating voltage of less than 36V. In contrast, an LED light strip with an operating voltage higher than 36V can be called a high-voltage LED light strip. The circuit structure of a traditional low-voltage LED light strip, taking a 24V low-voltage point-controlled RGB light strip or a hard light strip as an example, is powered by a 24V switching power supply. A plurality of control units are provided on the light strip. Each control unit includes a point-controlled IC and a light-emitting module of three colors, RGB. The light-emitting module is composed of six LED lamp beads of corresponding colors and a number of resistors in series. The point-controlled IC controls the light-emitting modules of three colors to achieve a colorful lighting effect. The multiple control units are arranged along the length of the LED light strip and are connected in parallel to the switching power supply through two copper foil circuits on the circuit board. Since the copper foil circuit is relatively thin, the current voltage drop increases sharply with the increase of the circuit length. When the voltage drop is greater than 6V, the point-controlled IC cannot maintain constant current operation. Therefore, after the control unit, the brightness of the light-emitting module drops sharply, resulting in uneven brightness at the beginning and end of the LED light strip. Therefore, under a switching power supply, the length of a traditional low-voltage point-controlled RGB light strip generally cannot exceed 10 meters. Utility Model Content

[0003] Based on this, it is necessary to provide a circuit structure of a high-voltage RGB point-controlled LED light strip with a simple circuit, low voltage drop, and uniform brightness over ultra-long distances to address the existing technical problems.

[0004] In order to solve the problems of the existing technology, the utility model discloses a circuit structure of a high-voltage RGB point-controlled LED light strip, wherein the power supply circuit includes an EMC filter module, the input end of the EMC filter module is used to connect to the mains power, and the output end thereof is connected to the rectifier filter module, the output end of the rectifier module is connected to the chopper transformer module, and the output end of the chopper transformer module is connected to the load circuit; the load circuit includes a main control module, a first sub-control module to an Nth sub-control module, the chopper transformer module outputs 48V-60V high-voltage direct current to the main control module, the first sub-control module to the Nth sub-control module, the main control module stores a main control program, and its control signal is transmitted to the first sub-control module, and then output to the Nth sub-control module in sequence through the first sub-control module, so that the first to Nth sub-control modules are synchronized.

[0005] The beneficial effects of the present invention are as follows: since the present invention adopts a chopper transformer module in the power supply circuit to provide 48V-60V high-voltage direct current for multiple sub-control modules, on the one hand, the voltage loss on the copper foil circuit can be reduced, and on the other hand, the voltage margin of the sub-control microcontroller can be improved. The LED light strip using this circuit can have a longer length of light strip connected to each power supply circuit.

[0006] The present invention can also be further improved as follows: the output end of the chopper transformer module is the positive electrode and the negative electrode of the power supply, which includes a power supply chip, and the power supply chip includes a positive pin, a negative pin, a current sampling pin, a feedback voltage pin, an output control pin and a chip ground pin; the positive pin is connected to the positive output end of the rectifier and filter module through a first resistor, and is connected to the negative output end of the rectifier and filter module through a second electrolytic capacitor, the negative pin and the chip ground pin are connected to the negative output end of the rectifier and filter module, the output control pin is connected to the gate of the field effect tube through a sixth resistor, the source of the field effect tube is connected to the negative output end of the rectifier and filter module through an eighth resistor, and the drain of the field effect tube is connected to the positive power supply through a first diode. The current sampling pin is connected to the source of the field effect tube through the seventh resistor, and is connected to the negative output end of the rectifier and filter module through the second capacitor. The drain of the field effect tube is also connected to a transformer, and the transformer includes a chopper coil and a power supply coil. The drain of the field effect tube is connected to the positive pole of the chopper coil, and the negative pole of the chopper coil is connected to the negative pole of the power supply. A third electrolytic capacitor and a ninth resistor are connected in parallel between the positive pole and the negative pole of the power supply. The positive pole of the transformer power supply coil is connected to the positive pin through the second diode and the third resistor connected in series. The feedback voltage pin is connected to the positive pole of the power supply coil through the fourth resistor, and is connected to the negative pole of the power supply coil and the negative output end of the rectifier and filter module through the fifth resistor and the fifth capacitor connected in parallel.

[0007] The main control module includes a main control microcontroller, which includes a positive pin, a negative pin, a discontinuous mode pin and a signal output pin. The positive pin of the main control microcontroller is connected to the positive pole of the power supply through a tenth resistor and a third diode, and its negative pin is connected to the negative pole of the power supply. A sixth capacitor, a fifth electrolytic capacitor and a voltage regulator diode are connected in parallel between the positive pin and the negative pin. A fourth electrolytic capacitor is connected between the output end of the third diode and the negative pole of the power supply. A switch is provided between the discontinuous mode pin and the negative pole of the power supply.

[0008] The sub-control module includes the first to Nth sub-control modules, each sub-control module includes a sub-control microcontroller and three light-emitting modules of red, green and blue; the sub-control microcontroller includes a positive pin, a negative pin, a signal input pin, a signal output pin and three control pins of red, green and blue, the three light-emitting modules are respectively composed of multiple LED lamp beads of corresponding light-emitting colors and resistors in series, the positive pin of the sub-control microcontroller is connected to the positive pole of the power supply and grounded through the seventh capacitor, its negative pin is connected to the negative pole of the power supply, the three control pins are respectively connected to the negative poles of the three light-emitting modules, and the positive poles of the three light-emitting modules are connected to the positive pole of the power supply; the signal input pin of the sub-control microcontroller of the first sub-control module is connected to the signal output pin of the main control microcontroller, its signal output pin is connected to the signal input pin of the sub-control microcontroller of the second sub-control module, the signal output pin of the sub-control microcontroller of the second sub-control module is connected to the signal input pin of the sub-control microcontroller of the third sub-control module, and so on. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a circuit diagram of the utility model.

[0010] Figure 2 This is the power supply circuit diagram of the utility model.

[0011] Figure 3 This is the load circuit diagram of the utility model. DETAILED DESCRIPTION

[0012] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following describes this utility model in further detail, in conjunction with the accompanying drawings and specific embodiments. In the following description, when an electronic component primarily serves as a power-consuming component, its current inflow terminal is the positive electrode, and its current outflow terminal is the negative electrode. When an electronic component primarily serves as a power supply component, its current outflow terminal is the positive electrode, and its current inflow terminal is the negative electrode.

[0013] refer to Figure 1. A circuit structure of a high-voltage RGB point-controlled LED light strip, including a power supply circuit and a load circuit, wherein the power supply circuit includes an EMC filter module 1, the input end of the EMC filter module 1 can be directly connected to the mains, and the output end thereof is connected to the rectifier filter module 2, the output end of the rectifier module 2 is connected to the chopper transformer module 3, and the output end of the chopper transformer module 3 is connected to the load circuit. The load circuit includes a main control module 4 and a first sub-control module 51, a second sub-control module 52 to an Nth sub-control module 5N. The output end of the chopper transformer module 3 is connected to the main control module 4, the first sub-control module 51, the second sub-control module 52 to the Nth sub-control module. The signal of the main control module 4 is transmitted to the first sub-control module 51, and then output to the Nth sub-control module in sequence through the first sub-control module 51.

[0014] refer to Figure 2 The EMC filter module 1 includes a filter L1, a thermistor RF connected to its live input terminal L, a fuse F connected to its neutral input terminal, a varistor RV connected between its live and neutral input terminals, and a safety capacitor CX connected between its two output terminals.

[0015] The rectifier and filter module 2 includes a rectifier bridge DB having two input terminals, a positive output terminal, and a negative output terminal. The two input terminals are connected to the two output terminals of the EMC filter module 1. A first electrolytic capacitor EC1 is connected between the positive output terminal and the negative output terminal.

[0016] The output ends of the chopper transformer module 3 are the positive power supply Vout+ and the negative power supply Vout-. The chopper transformer module 3 includes a power supply chip IC, and the power supply chip IC1 includes a positive pin VDD, a negative pin GND, a current sampling pin CS, a feedback voltage pin FB, an output control pin GATE, and a chip ground pin SEL. The positive pin VDD is connected to the positive output end of the rectifier and filter module 1 through a first resistor R1 and a second resistor R2 connected in series, and is connected to the negative output end of the rectifier and filter module 1 through a second electrolytic capacitor EC2 and a first capacitor C1 connected in parallel. The negative pin GND and the chip ground pin SEL are connected to the negative output end of the rectifier and filter module 1. The output control pin GATE is connected to the gate of the field effect transistor Q through a sixth resistor R6. The source of the field effect transistor Q is connected to the negative output end of the rectifier and filter module 1 through an eighth resistor R8. The drain of the field effect transistor Q is connected to the positive power supply Vout+ through a first diode D1. The current sampling pin CS is connected to the source of the field-effect transistor Q via a seventh resistor R7 and to the negative output terminal of the rectifier and filter module 1 via a second capacitor C2. The drain of the field-effect transistor Q is also connected to a transformer T, which includes a chopper coil TA and a power supply coil TB. The drain of the field-effect transistor Q is connected to the positive electrode of the chopper coil TA, and the negative electrode of the chopper coil TA is connected to the negative power supply electrode Vout-. A third electrolytic capacitor EC3 and a ninth resistor R9 are connected in parallel between the positive power supply electrode Vout+ and the negative power supply electrode Vout- as the filter output. The positive electrode of the power supply coil TB of the transformer T is connected to the positive pin VDD via a second diode D2 and a third resistor R3 connected in series. The feedback voltage pin FB is connected to the positive electrode of the power supply coil TB via a fourth resistor R4 and to the negative electrode of the power supply coil TB and the negative output terminal of the rectifier and filter module 1 via a fifth resistor R5 and a fifth capacitor C2 connected in parallel.

[0017] The power supply circuit operates as follows: AC mains power flows from the neutral / live input terminals N / L of the EMC filter module 1, is filtered, and then supplied to the rectifier and filter module 2. This rectifier and filter module 2 converts the 220V AC mains power into 220V high-voltage DC power, which is then output to the chopper and transformer module 3. After entering the chopper and transformer module 3, the high-voltage DC power flows through a startup circuit formed by a first resistor R1, a second resistor R2, and a second electrolytic capacitor C2 to provide startup current for the power supply IC. After the power supply IC starts, its output control pin GATE outputs a high level, turning on the field-effect transistor Q through a sixth resistor R6. At this point, the power supply passes through the positive terminal Vout+ of the power supply, passes through the load, and then undergoes voltage transformation through the chopper coil TA of the transformer TD before returning to the negative output terminal of the rectifier and filter module 2. As the current slowly rises through the chopper coil TA of transformer T, the voltage of its power supply coil TB also slowly rises to its peak value. At this point, the fourth resistor R4, the fifth resistor R5, and the fifth capacitor C5 form a voltage divider circuit. When this voltage divider voltage exceeds the FB reference voltage of the power supply chip IC, the GATE pin of the power supply chip IC goes low, the field-effect transistor Q turns off, and the current in the chopper coil TA forms a loop through the first diode D1 and the load. At this point, the current in the chopper coil TA begins to decrease from its peak value, and the voltage of the power supply coil TB also slowly decreases. When the voltage divider voltage falls below the FB reference voltage of the power supply chip IC, the GATE pin of the power supply chip IC goes high, and the field-effect transistor Q turns on again. Through this repeated on-and-off process, the field-effect transistor Q achieves chopper voltage reduction, outputting 48V-60V high-voltage DC power at the positive power supply terminal Vout+ and the negative power supply terminal Vout- to power the load. After the power chip IC starts, the startup circuit stops supplying power. Transformer T's power supply coil TB, second diode D2, third resistor R3, and second electrolytic capacitor C2 form a dynamic power supply circuit to power the power chip IC and simultaneously provide a sampled voltage for feedback voltage pin FB. This utility model uses chopper transformer module 3 to output 48V-60V high-voltage DC power to power the load, with an optimal voltage of 54V. This reduces voltage loss compared to traditional low-voltage power supplies and reduces the risk of electric shock compared to 220V high-voltage power supplies.

[0018] refer to Figure 3. The main control module 4 includes a main control microcontroller U, and the main control microcontroller U includes a positive pin VDD, a negative pin GND, a discontinuous mode pin LM, a speed adjustment pin SP, a continuous mode pin CM and a signal output pin DAT1. The positive pin VDD is connected to the positive pole of the power supply Vout+ through the tenth resistor R10 and the third diode D3, and the negative pin GND is connected to the negative pole of the power supply Vout-. A sixth capacitor C6, a fifth electrolytic capacitor EC5 and a voltage regulator diode ZD are connected in parallel between the positive pin VDD and the negative pin GND. A fourth electrolytic capacitor EC4 is connected between the output end of the third diode D3 and the negative pole of the power supply Vout-. When the discontinuous control mode is adopted, a switch K is provided between the discontinuous mode pin LM and the negative pole of the power supply Vout-; when the continuous control mode is adopted, a switch K may also be provided between the continuous mode pin CM and the negative pole of the power supply Vout-.

[0019] The sub-control module includes the first to Nth sub-control modules, each of which includes a sub-control microcontroller U1, a red light module 5R, a green light module 5G, and a blue light module 5B. The sub-control microcontroller U1 controls the three light-emitting modules within its module: the red light module 5R, the green light module 5G, and the blue light module 5B. The sub-control microcontroller U1 includes a positive pin VDD, a negative pin GND, signal input pins DAT / DAT2, a signal output pin DOUT, a red light control pin R, a green light control pin G, and a blue light control pin B. The red light module 5R, the green light module 5G, and the blue light module 5B each include multiple LED lamp beads of corresponding luminous colors and several resistors connected in series. The positive pin VDD is connected to the positive power supply voltage Vout+ and is grounded via a seventh capacitor C7. The negative pin GND is connected to the negative power supply voltage Vout-. The red light control pin R is connected to the negative pole of the red light module 5R, and the positive pole of the red light module 5R is connected to the positive pole of the power supply Vout+. The green light control pin G is connected to the negative pole of the green light module 5G, and the positive pole of the green light module 5G is connected to the positive pole of the power supply Vout+. The blue light control pin 5B is connected to the negative pole of the blue light module 5B, and the positive pole of the blue light module 5B is connected to the positive pole of the power supply Vout+. In terms of the signal circuit, the signal input pin DAT of the first sub-control module 51 is connected to the signal output pin DAT1 of the main control microcontroller U, and its signal output pin DOUT is connected to the signal input pin DAT of the second sub-control module 52; the signal output pin DOUT of the second sub-control module 52 is connected to the signal input pin DAT of the third sub-control module, and so on, until the Nth sub-control module. The signal circuit of the present invention adopts a series transmission mode, which can simplify the circuit structure and reduce the difficulty of wiring. Traditional 24V powered low-voltage LED light strips have a margin of only 6V between the supply voltage and the operating voltage of the control chip. Each power supply can only connect to a 10-meter-long LED light strip. However, this power supply circuit uses a 54V power supply with a voltage margin of up to 36V. Each power supply can be connected to a 100-meter-long light strip, and its sub-control microcontroller can still work normally and output a stable current for the light-emitting module.

[0020] Since the utility model adopts a chopper transformer module in the power supply circuit to provide 48V-60V high-voltage direct current for multiple sub-control modules, on the one hand, it can reduce the voltage loss in the copper foil circuit, and on the other hand, it can also improve the voltage margin of the sub-control microcontroller. The LED light strip using this circuit can connect a longer light strip to each power supply circuit.

[0021] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A circuit structure of a high-voltage RGB point-controlled LED light strip, comprising a power circuit and a load circuit, characterized in that: The power supply circuit includes an EMC filter module, the input end of the EMC filter module is used to connect to the mains power, and the output end of the EMC filter module is connected to the rectifier filter module, the output end of the rectifier module is connected to the chopper transformer module, and the output end of the chopper transformer module is connected to the load circuit; the load circuit includes a main control module, a first sub-control module to an Nth sub-control module, the chopper transformer module outputs 48V-60V high-voltage direct current to the main control module, the first sub-control module to the Nth sub-control module, the main control module stores a main control program, and its control signal is transmitted to the first sub-control module, and then output to the Nth sub-control module in sequence through the first sub-control module, so that the first to Nth sub-control modules are synchronized.

2. The circuit structure of a high-voltage RGB point-controlled LED light strip according to claim 1, characterized in that: The output end of the chopper transformer module is the positive electrode and the negative electrode of the power supply, which includes a power supply chip, and the power supply chip includes a positive pin, a negative pin, a current sampling pin, a feedback voltage pin, an output control pin and a chip ground pin; the positive pin is connected to the positive output end of the rectifier and filter module through a first resistor, and is connected to the negative output end of the rectifier and filter module through a second electrolytic capacitor, the negative pin and the chip ground pin are connected to the negative output end of the rectifier and filter module, the output control pin is connected to the gate of the field effect tube through a sixth resistor, the source of the field effect tube is connected to the negative output end of the rectifier and filter module through an eighth resistor, the drain of the field effect tube is connected to the positive power supply through a first diode, and the current sampling pin is connected to the negative output end of the rectifier and filter module through a sixth resistor. The seventh resistor is connected to the source of the field effect tube and is connected to the negative output end of the rectifier and filter module through the second capacitor. The drain of the field effect tube is also connected to a transformer, and the transformer includes a chopper coil and a power supply coil. The drain of the field effect tube is connected to the positive pole of the chopper coil, and the negative pole of the chopper coil is connected to the negative pole of the power supply. A third electrolytic capacitor and a ninth resistor are connected in parallel between the positive pole and the negative pole of the power supply. The positive pole of the transformer power supply coil is connected to the positive pin through the second diode and the third resistor in series. The feedback voltage pin is connected to the positive pole of the power supply coil through the fourth resistor, and is connected to the negative pole of the power supply coil and the negative output end of the rectifier and filter module through the fifth resistor and the fifth capacitor in parallel.

3. The circuit structure of a high-voltage RGB point-controlled LED light strip according to claim 2, characterized in that: The main control module includes a main control microcontroller, which includes a positive pin, a negative pin, a discontinuous mode pin and a signal output pin. The positive pin of the main control microcontroller is connected to the positive pole of the power supply through a tenth resistor and a third diode, and its negative pin is connected to the negative pole of the power supply. A sixth capacitor, a fifth electrolytic capacitor and a voltage regulator diode are connected in parallel between the positive pin and the negative pin. A fourth electrolytic capacitor is connected between the output end of the third diode and the negative pole of the power supply. A switch is provided between the discontinuous mode pin and the negative pole of the power supply.

4. The circuit structure of a high-voltage RGB point-controlled LED light strip according to claim 3, characterized in that: The sub-control module includes the first to Nth sub-control modules, each sub-control module includes a sub-control microcontroller and three light-emitting modules of red, green and blue; the sub-control microcontroller includes a positive pin, a negative pin, a signal input pin, a signal output pin and three control pins of red, green and blue, the three light-emitting modules are respectively composed of multiple LED lamp beads of corresponding light-emitting colors and resistors in series, the positive pin of the sub-control microcontroller is connected to the positive pole of the power supply and grounded through the seventh capacitor, its negative pin is connected to the negative pole of the power supply, the three control pins are respectively connected to the negative poles of the three light-emitting modules, and the positive poles of the three light-emitting modules are connected to the positive pole of the power supply; the signal input pin of the sub-control microcontroller of the first sub-control module is connected to the signal output pin of the main control microcontroller, its signal output pin is connected to the signal input pin of the sub-control microcontroller of the second sub-control module, the signal output pin of the sub-control microcontroller of the second sub-control module is connected to the signal input pin of the sub-control microcontroller of the third sub-control module, and so on.

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