A USB-powered LED driver board

Abstract

The utility model discloses a kind of LED drive boards of USB power supply, it is related to the technical field of drive circuit;It includes Type-C interface, primary voltage boosting drive unit, voltage setting unit, protection unit, first filter unit, secondary voltage boosting unit, current setting unit, second filter unit, sampling feedback unit and load port, the Type-C interface is electrically connected with primary voltage boosting drive unit, protection unit, first filter unit and secondary voltage boosting unit respectively, the primary voltage boosting drive unit is electrically connected with voltage setting unit, secondary voltage boosting unit is electrically connected with current setting unit, second filter unit, sampling feedback unit and load port respectively;It is improved through Type-C interface and secondary voltage boosting unit etc., and drive capability.

Description

Technical Field

[0001] This utility model relates to the field of driving circuit technology, and in particular to a USB-powered LED driver board. Background Technology

[0002] With the rapid development of electronic technology, the USB Type-C interface has been widely used in various electronic devices due to its excellent power supply capabilities and versatility. From smartphones and laptops to portable devices such as tablets, the USB Type-C interface, with its reversible design, slim profile, and powerful data transmission and power supply functions, has gradually become one of the standard interfaces for modern electronic devices.

[0003] With the increasing availability of chargers supporting the PD protocol and the resulting increase in output power, they can be used to power more electronic products, expanding the utilization rate of charging devices.

[0004] Therefore, how to improve the driving capability of LED driver boards has become an urgent technical problem to be solved. Utility Model Content

[0005] This invention provides a USB-powered LED driver board, solving the technical problem of improving driving capability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A USB-powered LED driver board includes a Type-C interface, a primary boost driver unit, a voltage setting unit, a protection unit, a first filter unit, a secondary boost unit, a current setting unit, a second filter unit, a sampling feedback unit, and a load port. The Type-C interface is electrically connected to the primary boost driver unit, the protection unit, the first filter unit, and the secondary boost unit. The primary boost driver unit is electrically connected to the voltage setting unit, and the secondary boost unit is electrically connected to the current setting unit, the second filter unit, the sampling feedback unit, and the load port.

[0007] A further technical solution is as follows: the GND terminal of the Type-C interface is electrically connected to the GND terminal of the primary boost drive unit; the CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost drive unit; the CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost drive unit; the D- terminal of the Type-C interface is electrically connected to the D- terminal of the primary boost drive unit; the D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost drive unit; the VBUS terminal of the Type-C interface is electrically connected to the VDD terminal of the primary boost drive unit; the VBUS terminal of the Type-C interface is electrically connected to the protection unit; the VBUS terminal of the Type-C interface is electrically connected to the first filter unit; and the VBUS terminal of the Type-C interface is electrically connected to the input terminal of the secondary boost unit.

[0008] A further technical solution is that the Type-C interface includes a first Type-C interface J1 and a second Type-C interface J2, the first Type-C interface J1 is a twelve-pin interface, and the second Type-C interface J2 is a twenty-four-pin interface.

[0009] A further technical solution is as follows: the VSET terminal of the primary boost drive unit is electrically connected to the voltage setting unit; the output terminal of the secondary boost unit is electrically connected to the second filter unit, the sampling feedback unit, and the VLED terminal of the load port, respectively; the OVP terminal of the secondary boost unit is electrically connected to the sampling feedback unit; the CH1 terminal of the secondary boost unit is electrically connected to the CH1 terminal of the load port; the CH2 terminal of the secondary boost unit is electrically connected to the CH2 terminal of the load port; the CH3 terminal of the secondary boost unit is electrically connected to the CH3 terminal of the load port; the CH4 terminal of the secondary boost unit is electrically connected to the CH4 terminal of the load port; and the ISET terminal of the secondary boost unit is electrically connected to the current setting unit.

[0010] A further technical solution is as follows: the primary boost drive unit includes a primary boost driver U1, a first resistor R1, a fifth capacitor C5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The VBUS terminal of the Type-C interface is grounded through the first resistor R1 and the fifth capacitor C5. The junction of the first resistor R1 and the fifth capacitor C5 is electrically connected to the VDD terminal of the primary boost driver U1. The D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost driver U1. The D- terminal of the Type-C interface is electrically connected to the D- terminal of the primary boost driver U1. The CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost driver U1. The CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost driver U1. The CC1 terminal of the primary boost driver U1 is grounded through the sixth resistor R6. The CC2 terminal of the primary boost driver U1 is grounded through the seventh resistor R7. The ISEL terminal of the primary boost driver U1 is grounded through the eighth resistor R8. The VSET terminal of the primary boost driver U1 is grounded through a voltage setting unit.

[0011] A further technical solution is as follows: the voltage setting unit includes a first DIP switch S1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the second resistor R2, the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the third resistor R3, the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the fourth resistor R4, and the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the fifth resistor R5. The protection unit is a diode D1, and the VBUS terminal of the Type-C interface is grounded via the diode D1. The first filtering unit includes first to fourth capacitors C1 to C4, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected in parallel, and the VBUS terminal of the Type-C interface is grounded via the parallel first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4.

[0012] A further technical solution is as follows: the secondary boost unit includes a current and voltage controller U2, a fuse F1, an inductor L1, a diode D2, a light-emitting diode D3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, an eighth capacitor C8, a ninth capacitor C9, a thirteenth capacitor C13, and a fourteenth capacitor C14. 14. The VBUS terminal of the Type-C interface is grounded sequentially via fuse F1, inductor L1, diode D2, and the second filter unit. The junction of fuse F1 and inductor L1 is grounded sequentially via eleventh resistor R11 and thirteenth capacitor C13. The junction of eleventh resistor R11 and thirteenth capacitor C13 is electrically connected to the VIN terminal of current and voltage controller U2. The junction of inductor L1 and diode D2 is electrically connected to the LX terminal of current and voltage controller U2. The input terminal of the secondary boost unit is the input of fuse F1. At the input, the output of the secondary boost unit is the negative terminal of diode D2; the EN terminal of the current-voltage controller U2 is grounded sequentially through the thirteenth resistor R13 and the seventeenth resistor R17, and the junction of the thirteenth resistor R13 and the seventeenth resistor R17 is electrically connected to the PWM terminal of the current-voltage controller U2; the VBUS terminal of the Type-C interface is grounded sequentially through the ninth resistor R9 and the twelfth resistor R12, and the junction of the ninth resistor R9 and the twelfth resistor R12 is electrically connected to the EN terminal of the current-voltage controller U2; the ninth resistor R9, the twelfth resistor R12, the thirteenth resistor R13, and the seventeenth resistor R17 form an enable unit; the negative terminal of diode D2 is electrically connected to the VLED terminal of the load port; the CH1 terminal of the current-voltage controller U2 is electrically connected to the CH1 terminal of the load port; the CH2 terminal of the current-voltage controller U2 is electrically connected to the CH2 terminal of the load port; the CH3 terminal of the current-voltage controller U2 is electrically connected to the CH3 terminal of the load port; and the CH4 terminal of the current-voltage controller U2 is electrically connected to the CH4 terminal of the load port.

[0013] A further technical solution is that the secondary boost unit further includes a first jumper interface W1 and a second jumper interface W2. The first jumper interface W1 is electrically connected between the CH1 and CH2 terminals of the current and voltage controller U2, and the second jumper interface W2 is electrically connected between the CH3 and CH4 terminals of the current and voltage controller U2.

[0014] A further technical solution is as follows: The second filtering unit includes a sixth capacitor C6, a seventh capacitor C7, a tenth capacitor C10, and an eleventh capacitor C11. The sixth capacitor C6, the seventh capacitor C7, the tenth capacitor C10, and the eleventh capacitor C11 are connected in parallel. The negative terminal of diode D2 is grounded via the parallel-connected sixth capacitor C6, the seventh capacitor C7, the tenth capacitor C10, and the eleventh capacitor C11. The current setting unit includes a second DIP switch S2, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, and a thirty-sixth resistor R36. The ISET terminal of the current and voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-third resistor R33, and the ISET terminal of the current and voltage controller U2 is electrically connected to the sixth resistor S2 via the thirty-fourth resistor R34. The two DIP switches S2 are electrically connected. The ISET terminal of the current and voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-fifth resistor R35. The ISET terminal of the current and voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-sixth resistor R36. The sampling feedback unit includes the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16 and the twelfth capacitor C12. The negative terminal of the diode D2 is grounded via the fourteenth resistor R14 and the sixteenth resistor R16. The fifteenth resistor R15 and the sixteenth resistor R16 are connected in parallel. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is grounded via the twelfth capacitor C12. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is electrically connected to the OVP terminal of the current and voltage controller U2.

[0015] A further technical solution is that the load port includes a first load port CON1 and a second load port CON2, the first load port CON1 is a six-pin interface, and the second load port CON2 is a five-pin interface.

[0016] The beneficial effects of adopting the above technical solution are as follows: A USB-powered LED driver board includes a Type-C interface, a primary boost driver unit, a voltage setting unit, a protection unit, a first filter unit, a secondary boost unit, a current setting unit, a second filter unit, a sampling feedback unit, and a load port. The Type-C interface is electrically connected to the primary boost driver unit, the protection unit, the first filter unit, and the secondary boost unit. The primary boost driver unit is electrically connected to the voltage setting unit, and the secondary boost unit is electrically connected to the current setting unit, the second filter unit, the sampling feedback unit, and the load port. Through the Type-C interface and the secondary boost unit, its driving capability is improved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the principle of this utility model; Figure 2a is the circuit schematic of the first Type-C interface J1; Figure 2 b is the circuit schematic of the second Type-C interface J2; Figure 3 This is the circuit schematic of a boost drive unit; Figure 4 This is the circuit schematic of the voltage setting unit; Figure 5 This is the circuit schematic diagram of the protection unit and the first filter unit; Figure 6 This is the circuit schematic of the current and voltage controller U2 in the secondary boost unit; Figure 7 This is the circuit schematic of the enable unit in the secondary boost unit; Figure 8 This is the circuit schematic of the second filter unit; Figure 9 This is the circuit schematic of the current setting unit; Figure 10 This is the circuit schematic of the sampling feedback unit; Figure 11 a is the circuit schematic of the first load port CON1; Figure 11 b is the circuit schematic of the second load port CON2. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] like Figure 1As shown, this utility model discloses a USB-powered LED driver board, including a Type-C interface, a primary boost driver unit, a voltage setting unit, a protection unit, a first filter unit, a secondary boost unit, a current setting unit, a second filter unit, a sampling feedback unit, and a load port. The GND terminal of the Type-C interface is electrically connected to the GND terminal of the primary boost driver unit, the CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost driver unit, the CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost driver unit, the D- terminal of the Type-C interface is electrically connected to the D- terminal of the primary boost driver unit, the D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost driver unit, the VBUS terminal of the Type-C interface is electrically connected to the VDD terminal of the primary boost driver unit, and the VBUS terminal of the Type-C interface is electrically connected to the protection unit. The protection unit is electrically connected; the VBUS terminal of the Type-C interface is electrically connected to the first filter unit; the VBUS terminal of the Type-C interface is electrically connected to the input terminal of the secondary boost unit; the VSET terminal of the primary boost drive unit is electrically connected to the voltage setting unit; the output terminal of the secondary boost unit is electrically connected to the second filter unit; the output terminal of the secondary boost unit is electrically connected to the sampling feedback unit; the output terminal of the secondary boost unit is electrically connected to the VLED terminal of the load port; the OVP terminal of the secondary boost unit is electrically connected to the sampling feedback unit; the CH1 terminal of the secondary boost unit is electrically connected to the CH1 terminal of the load port; the CH2 terminal of the secondary boost unit is electrically connected to the CH2 terminal of the load port; the CH3 terminal of the secondary boost unit is electrically connected to the CH3 terminal of the load port; the CH4 terminal of the secondary boost unit is electrically connected to the CH4 terminal of the load port; and the ISET terminal of the secondary boost unit is electrically connected to the current setting unit.

[0021] The Type-C interface is an input interface, as described below.

[0022] USB Type-C interface: Also known as Universal Serial Bus Type-C interface, or simply Type-C interface, it is a new USB interface standard designed to provide high-speed data transfer, high-power charging, and support for various functions. It is widely used due to its reversible plug design, compact size, and versatility. It comes in several form factors.

[0023] The Type-C interface includes a first Type-C interface J1 and a second Type-C interface J2, as described below.

[0024] This solution uses both 12-pin and 24-pin interface forms in parallel. However, only the VBUS, D+, D-, CC1, CC2, and GND pins are used in both cases.

[0025] like Figure 2As shown in Figure a, this is the circuit schematic of the first Type-C interface J1, which is a twelve-pin interface.

[0026] like Figure 2 As shown in Figure b, this is the circuit schematic of the second Type-C interface J2, which is a 24-pin interface.

[0027] like Figure 3 The diagram shown is a circuit schematic of a primary boost driver unit. The primary boost driver unit connects to a Type-C interface and includes a primary boost driver U1, a first resistor R1, a fifth capacitor C5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The primary boost driver U1 is the voltage decoy main chip. The VBUS terminal of the Type-C interface is grounded through the first resistor R1 and the fifth capacitor C5. The junction of the first resistor R1 and the fifth capacitor C5 is electrically connected to the VDD terminal of the primary boost driver U1. The D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost driver U1. The D- terminal of the e-C interface is electrically connected to the D- terminal of the primary boost driver U1. The CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost driver U1. The CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost driver U1. The CC1 terminal of the primary boost driver U1 is grounded through the sixth resistor R6. The CC2 terminal of the primary boost driver U1 is grounded through the seventh resistor R7. The ISEL terminal of the primary boost driver U1 is grounded through the eighth resistor R8. The VSET terminal of the 6th pin of the primary boost driver U1 is grounded through the voltage setting unit.

[0028] CC1 or CC2 is used for communication with the PD module. It is a single-wire protocol. CC1 is used to communicate with the device when the module is plugged in correctly, and CC2 is used when it is plugged in incorrectly. The two external resistors, the sixth resistor R6 and the seventh resistor R7, are used to wake up the TYPE C charger. The first resistor R1 and the fifth capacitor C5 are used to limit the current supply to the primary boost driver U1, thus better protecting the VDD pin of the primary boost driver U1.

[0029] like Figure 4The diagram shows the circuit schematic of the voltage setting unit. The voltage setting unit, also known as the decoy voltage setting unit, includes a first DIP switch S1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The VSET terminal of the primary boost driver U1 is electrically connected to pin 1 of the first DIP switch S1 via the second resistor R2. The VSET terminal of the primary boost driver U1 is electrically connected to pin 2 of the first DIP switch S1 via the third resistor R3. The VSET terminal of the primary boost driver U1 is electrically connected to pin 3 of the first DIP switch S1 via the fourth resistor R4. The VSET terminal of the primary boost driver U1 is electrically connected to pin 4 of the first DIP switch S1 via the fifth resistor R5. Pins 5, 6, 7, and 8 of the first DIP switch S1 are connected together and then grounded.

[0030] The main component is the first DIP switch S1, which is used as the selection device. It is connected to four types of resistors R2, R3, R4 and R5. The different resistance values ​​are used to set the output voltage of the TYPE C interface. This solution sets four voltages: 9V, 12V, 15V and 20V, which is VBUS.

[0031] like Figure 5 The diagram shows the circuit schematic of the protection unit and the first filter unit. The protection unit is a diode D1, and the VBUS terminal of the Type-C interface is grounded through diode D1. The first filter unit includes first to fourth capacitors C1 to C4. The first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected in parallel. The VBUS terminal of the Type-C interface is grounded through the parallel connection of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4.

[0032] Diode D1 is a TVS protection device to prevent instantaneous overvoltage or overcurrent in the circuit and protect downstream components. The first to fourth capacitors, C1 to C4, are capacitors of different capacitance values ​​used to smooth the DC output and stabilize the voltage.

[0033] like Figure 6 and Figure 7 As shown, the secondary boost unit includes a current and voltage controller U2, a fuse F1, an inductor L1, a diode D2, a light-emitting diode D3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, an eighth capacitor C8, a ninth capacitor C9, a thirteenth capacitor C13, and a fourteenth capacitor C14.

[0034] like Figure 6The diagram shows the circuit schematic of the current-voltage controller U2 in the secondary boost unit. The VBUS terminal of the Type-C interface is grounded sequentially via fuse F1, inductor L1, diode D2, and the second filter unit. The junction of fuse F1 and inductor L1 is grounded sequentially via the eleventh resistor R11 and the thirteenth capacitor C13. The junction of the eleventh resistor R11 and the thirteenth capacitor C13 is electrically connected to the VIN terminal of the current-voltage controller U2. The junction of inductor L1 and diode D2 is electrically connected to the LX terminal of the current-voltage controller U2. The input terminal of the secondary boost unit is the input terminal of fuse F1, and the output terminal of the secondary boost unit is the cathode of diode D2.

[0035] like Figure 7 The diagram shows the circuit schematic of the enable unit in the secondary boost unit. The EN terminal of the current-voltage controller U2 is grounded sequentially via the thirteenth resistor R13 and the seventeenth resistor R17. The junction of the thirteenth resistor R13 and the seventeenth resistor R17 is electrically connected to the PWM terminal of the current-voltage controller U2. The VBUS terminal of the Type-C interface is grounded sequentially via the ninth resistor R9 and the twelfth resistor R12. The junction of the ninth resistor R9 and the twelfth resistor R12 is electrically connected to the EN terminal of the current-voltage controller U2. The ninth resistor R9, the twelfth resistor R12, the thirteenth resistor R13, and the seventeenth resistor R17 form the enable unit.

[0036] The VBUS voltage, boosted by the front-end, passes through the fast-blow fuse F1, filter capacitors C8 and C9, and is then sent to pin 11 of the current-voltage controller U2. A current-limiting resistor R11 is connected in series to protect the current-voltage controller U2. The VBUS voltage is then divided by resistors R9 and R12 and connected to pin 10 (EN) of the current-voltage controller, enabling the current-voltage controller U2 to operate.

[0037] like Figure 8 The diagram shown is the circuit schematic of the second filter unit. The second filter unit includes a sixth capacitor C6, a seventh capacitor C7, a tenth capacitor C10, and an eleventh capacitor C11. The sixth capacitor C6, the seventh capacitor C7, the tenth capacitor C10, and the eleventh capacitor C11 are connected in parallel. The negative terminal of diode D2 is grounded through the parallel connection of the sixth capacitor C6, the seventh capacitor C7, the tenth capacitor C10, and the eleventh capacitor C11.

[0038] The current and voltage controller U2 is an RT8575. The internal oscillation circuit of the RT8575 starts working, controlling the high-speed switching of the internal MOSFET. Inductor L1 stores energy when the switch is on and releases it when the switch is off. The energy is rectified by diode D2 and filtered by capacitors C6, C7, C10, and C11, ultimately outputting VLED1 to drive the load. Solid-state capacitors C6 and C7 are used for more stable output and better noise immunity.

[0039] Pins 1, 2, 3, and 4 of the current and voltage controller U2 are connected to the feedback terminals of the load, meaning that up to four loads can be connected.

[0040] like Figure 9 The diagram shows the circuit schematic of the current setting unit. The current setting unit includes a second DIP switch S2, a 33rd resistor R33, a 34th resistor R34, a 35th resistor R35, and a 36th resistor R36. The ISET terminal of the current-voltage controller U2 is electrically connected to pin 1 of the second DIP switch S2 via the 33rd resistor R33. The ISET terminal of the current-voltage controller U2 is electrically connected to pin 2 of the second DIP switch S2 via the 34th resistor R34. The ISET terminal of the current-voltage controller U2 is electrically connected to pin 3 of the second DIP switch S2 via the 35th resistor R35. The ISET terminal of the current-voltage controller U2 is electrically connected to pin 4 of the second DIP switch S2 via the 36th resistor R36. Pins 5, 6, 7, and 8 of the second DIP switch S2 are connected together and then grounded.

[0041] Pin 6, ISET, of the current / voltage controller U2 is used to set the output current. Connecting to the current setting unit, the second DIP switch S2 selects different resistor values ​​(33rd resistor R33, 34th resistor R34, 35th resistor R35, or 36th resistor R36) to set the current value. The maximum current for each load channel can reach 150mA. For larger load currents, this solution provides a first jumper interface W1, which can combine CH1 and CH2 into one channel, achieving a maximum drive current of 300mA. Similarly, the second jumper interface W2 can combine CH3 and CH4 into one channel.

[0042] Current setting: ILED = 900 / RSET, set the current value for each CHANEL on the ISET pin of the main chip, i.e., the current and voltage controller U2.

[0043] If a certain channel does not need to be connected to a load, such as CH2 being unloaded, then the pin needs to be connected to GND through the 21st resistor R21 to protect the current and voltage controller U2. The 20th resistor R20 has the same function as the 21st resistor R21.

[0044] The switching frequency of the current and voltage controller U2 is set by the nineteenth resistor R19. After testing, the performance is most stable when the frequency is set to 300KHZ.

[0045] like Figure 10 The diagram shows the circuit schematic of the sampling feedback unit. The sampling feedback unit includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a twelfth capacitor C12. The cathode of diode D2 is grounded via the fourteenth resistor R14 and the sixteenth resistor R16. The fifteenth resistor R15 and the sixteenth resistor R16 are connected in parallel. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is grounded via the twelfth capacitor C12. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is electrically connected to the OVP terminal of the current and voltage controller U2.

[0046] The sampling voltage OVP1 is obtained by dividing the voltage through the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16. It is connected to pin 16 of the current and voltage controller U2. If OVP1 exceeds 1.2V, the protection function of the main chip will be triggered, the switching pulses output from pins 12 and 13 will be turned off, and the chip will stop working.

[0047] like Figure 11 Figure a shows the circuit schematic of the first load port CON1.

[0048] like Figure 11 Figure b shows the circuit schematic of the second load port CON2.

[0049] like Figure 6 , Figure 11 a and Figure 11 As shown in Figure b, the cathode of diode D2 is electrically connected to the VLED terminal of the load port, and the network name is VLED1. The CH1 terminal of current-voltage controller U2 is electrically connected to the CH1 terminal of the load port, and the network name is FB1. The CH2 terminal of current-voltage controller U2 is electrically connected to the CH2 terminal of the load port, and the network name is FB2. The CH3 terminal of current-voltage controller U2 is electrically connected to the CH3 terminal of the load port, and the network name is FB3. The CH4 terminal of current-voltage controller U2 is electrically connected to the CH4 terminal of the load port, and the network name is FB4.

[0050] Two types of interfaces are provided for user convenience.

[0051] Output short-circuit protection to ground: During normal operation, if one of the LEDs short-circuits to ground, the voltage applied to one of the CH1-CH4 pins will rise to the 5.6V threshold, and the channel will be shut down and locked. If all LEDs in all channels short-circuit, the internal switch of the boost converter will be turned off. Normal operation will only resume after the short circuit is cleared.

[0052] At this point, the VBUS output from the USB TYPE C interface can be boosted to a maximum of about 100V after a second voltage boost, driving four LED light strips.

[0053] Multiple secondary boost units can be connected in parallel, sharing the VBUS after the primary boost, to boost the voltage to VLED2 and VLED3, etc., to drive more loads.

[0054] To facilitate understanding of the technical solution of this application, the technical concept of this application is described as follows.

[0055] The technical solution of this application is a backlight driver solution based on a USB interface, which supports USB PD3.0 and PD3.2EPR protocols.

[0056] The USB Type-C interface supports 20V voltage and 5A current, meeting the power supply needs of various high-power devices. This high-voltage and high-current characteristic makes the USB Type-C interface suitable not only for consumer electronics but also for industrial equipment, portable instruments, and other fields, providing a new power supply solution. Against this backdrop, voltage spoofing technology emerged, which allows adjustment of the USB Type-C interface's output voltage to meet the power supply requirements of specific devices. However, not all devices natively support the PD protocol, necessitating a bridge device called a PD spoofing chip.

[0057] This solution is based on the USB PD protocol. It uses a decoy chip to set the output voltage of the USB interface to 12V or 20V, which can be selected according to the requirements. Then, through the LED driver circuit, the voltage is boosted again to a higher level to meet the backlight lighting requirements, and the brightness level can be adjusted.

[0058] The core function of the PD decoy chip is to simulate the PD protocol handshake process, inducing the charger to output a specific voltage, thereby providing high-voltage support for non-PD devices. This solution aims to leverage the power supply advantages of the USB Type-C interface, combined with the voltage decoy chip, to achieve precise 9V / 12V / 15V or 20V output voltage control. This voltage can be selected through the decoy voltage setting unit, completing the first voltage boost, thereby providing a stable and suitable first-stage power supply for specific devices.

[0059] Technical advantages: The technical solution of this application is suitable for driving high-power LED light strings, requiring only a PD charger. It also features output overvoltage and overcurrent protection, and the circuit is simple and reliable.

Claims

1. A USB-powered LED driver board, characterized in that: It includes a Type-C interface, a primary boost drive unit, a voltage setting unit, a protection unit, a first filter unit, a secondary boost unit, a current setting unit, a second filter unit, a sampling feedback unit, and a load port. The Type-C interface is electrically connected to the primary boost drive unit, the protection unit, the first filter unit, and the secondary boost unit, respectively. The primary boost drive unit is electrically connected to the voltage setting unit, and the secondary boost unit is electrically connected to the current setting unit, the second filter unit, the sampling feedback unit, and the load port, respectively.

2. The USB-powered LED driver board according to claim 1, characterized in that: The GND terminal of the Type-C interface is electrically connected to the GND terminal of the primary boost drive unit; the CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost drive unit; the CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost drive unit; the D- terminal of the Type-C interface is electrically connected to the D- terminal of the primary boost drive unit; the D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost drive unit; the VBUS terminal of the Type-C interface is electrically connected to the VDD terminal of the primary boost drive unit; the VBUS terminal of the Type-C interface is electrically connected to the protection unit; the VBUS terminal of the Type-C interface is electrically connected to the first filter unit; and the VBUS terminal of the Type-C interface is electrically connected to the input terminal of the secondary boost unit.

3. The USB-powered LED driver board according to claim 1, characterized in that: The Type-C interface includes a first Type-C interface J1 and a second Type-C interface J2. The first Type-C interface J1 is a twelve-pin interface, and the second Type-C interface J2 is a twenty-four-pin interface.

4. The USB-powered LED driver board according to claim 1, characterized in that: The VSET terminal of the primary boost drive unit is electrically connected to the voltage setting unit. The output terminal of the secondary boost unit is electrically connected to the second filter unit, the sampling feedback unit, and the VLED terminal of the load port, respectively. The OVP terminal of the secondary boost unit is electrically connected to the sampling feedback unit. The CH1 terminal of the secondary boost unit is electrically connected to the CH1 terminal of the load port. The CH2 terminal of the secondary boost unit is electrically connected to the CH2 terminal of the load port. The CH3 terminal of the secondary boost unit is electrically connected to the CH3 terminal of the load port. The CH4 terminal of the secondary boost unit is electrically connected to the CH4 terminal of the load port. The ISET terminal of the secondary boost unit is electrically connected to the current setting unit.

5. The USB-powered LED driver board according to claim 1, characterized in that: The primary boost drive unit includes a primary boost driver U1, a first resistor R1, a fifth capacitor C5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The VBUS terminal of the Type-C interface is grounded through the first resistor R1 and the fifth capacitor C5. The junction of the first resistor R1 and the fifth capacitor C5 is electrically connected to the VDD terminal of the primary boost driver U1. The D+ terminal of the Type-C interface is electrically connected to the D+ terminal of the primary boost driver U1. The D- terminal of the Type-C interface is electrically connected to the D- terminal of the primary boost driver U1. The CC1 terminal of the Type-C interface is electrically connected to the CC1 terminal of the primary boost driver U1. The CC2 terminal of the Type-C interface is electrically connected to the CC2 terminal of the primary boost driver U1. The CC1 terminal of the primary boost driver U1 is grounded through the sixth resistor R6. The CC2 terminal of the primary boost driver U1 is grounded through the seventh resistor R7. The ISEL terminal of the primary boost driver U1 is grounded through the eighth resistor R8. The VSET terminal of the primary boost driver U1 is grounded through a voltage setting unit.

6. The USB-powered LED driver board according to claim 1, characterized in that: The voltage setting unit includes a first DIP switch S1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the second resistor R2, the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the third resistor R3, the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the fourth resistor R4, and the VSET terminal of the primary boost driver U1 is electrically connected to the first DIP switch S1 via the fifth resistor R5. The protection unit is a diode D1, and the VBUS terminal of the Type-C interface is grounded via the diode D1. The first filtering unit includes first to fourth capacitors C1 to C4, which are connected in parallel. The VBUS terminal of the Type-C interface is grounded via the parallel capacitors C1, C2, C3, and C4.

7. The USB-powered LED driver board according to claim 1, characterized in that: The secondary boost unit includes a current and voltage controller U2, a fuse F1, an inductor L1, a diode D2, a light-emitting diode D3, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, an eighth capacitor C8, a ninth capacitor C9, a thirteenth capacitor C13, and a fourteenth capacitor C14. (Type-) The VBUS terminal of the C interface is grounded sequentially via fuse F1, inductor L1, diode D2, and the second filter unit. The junction of fuse F1 and inductor L1 is grounded sequentially via the eleventh resistor R11 and the thirteenth capacitor C13. The junction of the eleventh resistor R11 and the thirteenth capacitor C13 is electrically connected to the VIN terminal of the current-voltage controller U2. The junction of inductor L1 and diode D2 is electrically connected to the LX terminal of the current-voltage controller U2. The input terminal of the secondary boost unit is the input terminal of fuse F1. The output terminal of the boost unit is the negative terminal of diode D2; the EN terminal of the current-voltage controller U2 is grounded sequentially through the thirteenth resistor R13 and the seventeenth resistor R17, and the junction of the thirteenth resistor R13 and the seventeenth resistor R17 is electrically connected to the PWM terminal of the current-voltage controller U2; the VBUS terminal of the Type-C interface is grounded sequentially through the ninth resistor R9 and the twelfth resistor R12, and the junction of the ninth resistor R9 and the twelfth resistor R12 is electrically connected to the EN terminal of the current-voltage controller U2; the ninth resistor R9, the twelfth resistor R12, the thirteenth resistor R13, and the seventeenth resistor R17 form an enable unit; the negative terminal of diode D2 is electrically connected to the VLED terminal of the load port; the CH1 terminal of the current-voltage controller U2 is electrically connected to the CH1 terminal of the load port; the CH2 terminal of the current-voltage controller U2 is electrically connected to the CH2 terminal of the load port; the CH3 terminal of the current-voltage controller U2 is electrically connected to the CH3 terminal of the load port; and the CH4 terminal of the current-voltage controller U2 is electrically connected to the CH4 terminal of the load port.

8. A USB-powered LED driver board according to claim 7, characterized in that: The secondary boost unit also includes a first jumper interface W1 and a second jumper interface W2. The first jumper interface W1 is electrically connected between the CH1 and CH2 terminals of the current and voltage controller U2, and the second jumper interface W2 is electrically connected between the CH3 and CH4 terminals of the current and voltage controller U2.

9. A USB-powered LED driver board according to claim 1, characterized in that: The second filtering unit includes a sixth capacitor C6, a seventh capacitor C7, a tenth capacitor C10, and an eleventh capacitor C11. These capacitors are connected in parallel. The cathode of diode D2 is grounded via the parallel connection of these capacitors. The current setting unit includes a second DIP switch S2, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, and a thirty-sixth resistor R36. The ISET terminal of the current-voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-third resistor R33, and the ISET terminal of the current-voltage controller U2 is connected to the second DIP switch S2 via the thirty-fourth resistor R34. S2 is electrically connected. The ISET terminal of the current and voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-fifth resistor R35. The ISET terminal of the current and voltage controller U2 is electrically connected to the second DIP switch S2 via the thirty-sixth resistor R36. The sampling feedback unit includes the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, and the twelfth capacitor C12. The negative terminal of the diode D2 is grounded via the fourteenth resistor R14 and the sixteenth resistor R16. The fifteenth resistor R15 and the sixteenth resistor R16 are connected in parallel. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is grounded via the twelfth capacitor C12. The junction of the fourteenth resistor R14 and the sixteenth resistor R16 is electrically connected to the OVP terminal of the current and voltage controller U2.

10. A USB-powered LED driver board according to claim 1, characterized in that: The load ports include a first load port CON1 and a second load port CON2. The first load port CON1 is a six-pin interface, and the second load port CON2 is a five-pin interface.

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