Control circuit for adjusting color temperature of lamp bead through Bluetooth double-line output

Abstract

The utility model discloses a Bluetooth double-line output control circuit for adjusting color temperature of a lamp bead, which comprises a power supply circuit, and a Bluetooth control circuit, an MOS (Metal Oxide Semiconductor) tube driving circuit and an H-bridge driving circuit which are all connected with the power supply circuit, and further comprises a lamp bead LED1 and a lamp bead LED2 which are connected in parallel, the output end of the Bluetooth control circuit is connected with the input end of the MOS tube driving circuit, the output end of the MOS tube driving circuit is connected with the input end of the H-bridge driving circuit, and the output end of the H-bridge driving circuit is connected with the lamp bead LED1 and the lamp bead LED2. According to the utility model, only two output lines are needed to realize color temperature adjustment and selection, and the LED lamp can be suitable for more occasions, has high user experience, does not need to be driven by an external controller, and is more convenient in wiring and simpler in wiring.

Description

Technical Field

[0001] The utility model relates to the technical field of lamp bead color temperature driving circuits, in particular to a control circuit for adjusting the color temperature of lamp beads through a Bluetooth dual-wire output. Background Art

[0002] In different environments, consumers have different demands for the color temperature of lamps. Therefore, the color temperature of lamps needs to be adjusted according to the environment so that the color temperature of lamps is more in line with human senses and makes consumers feel more comfortable. In order to achieve color temperature adjustment of lamps, existing lamps often require more than three control cables and an external controller driver. Such a structure is not suitable in some scenarios and brings difficulties to the application in many occasions. For this reason, a control circuit with adjustable color temperature with fewer control cables and preferably without the need for an external controller driver is needed to make the operation more convenient and quicker, and improve the user experience. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a control circuit for adjusting the color temperature of lamp beads through a Bluetooth dual-wire output, which can solve the problems described in the background technology.

[0004] The technical solution for achieving the purpose of the utility model is: a control circuit for adjusting the color temperature of lamp beads with a Bluetooth dual-wire output, comprising a power supply circuit, and a Bluetooth control circuit, a MOS tube drive circuit and an H-bridge drive circuit all connected to the power supply circuit, and also comprising lamp beads LED1 and lamp beads LED2 connected in parallel, the power supply circuit is used to output different voltages to provide the working voltages required by the Bluetooth control circuit, the MOS tube drive circuit and the H-bridge drive circuit respectively, the output end of the Bluetooth control circuit is connected to the input end of the MOS tube drive circuit, the output end of the MOS tube drive circuit is connected to the input end of the H-bridge drive circuit, the output end of the H-bridge drive circuit is connected to the lamp beads LED1 and the lamp beads LED2, the Bluetooth control circuit is used to output a first voltage control signal that can control the conduction and cutoff of the MOS tube drive circuit based on the received Bluetooth signal, the MOS tube drive circuit is used to prohibit all MOS tubes in the H-bridge drive circuit from being turned on, and the MOS tube drive circuit has a locking function, the H-bridge drive circuit includes at least two MOS tubes, and the H-bridge drive circuit is used to control the current flow direction of the two output lines connected to the lamp beads LED1 and the lamp beads LED2.

[0005] Furthermore, the power supply circuit includes a first power supply branch and a second power supply branch, the first power supply branch includes a DC-DC step-down regulator U3, a capacitor C10, a capacitor C13, a capacitor C6, a capacitor C8, a capacitor C14, a capacitor C15, a resistor R14, a resistor R16, an inductor L1 and a diode D8, the capacitor C10 and the capacitor C13 are connected in parallel to form a first parallel branch, one end of the first parallel branch is connected to an external voltage, one end of the first parallel branch connected to an external voltage is also connected to the input end of the regulator U3, the other end of the first parallel branch is grounded together with the ground end of the regulator U3, the enable end of the regulator is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit, the BS end of the regulator U3 is connected in series with the capacitor C6 and then connected to one end of the inductor L1, and one end of the inductor L1 is also respectively connected to the S of the regulator U3. W end and the cathode of the diode D8 are connected, the anode of the diode D8 is connected to the ground end of the voltage regulator U3 and then grounded together, the anode of the diode D8 is also connected to one end of the second parallel branch and grounded together, the other end of the inductor L1 is connected to the other end of the second parallel branch and the connection node serves as the output end of the first power supply branch, the second parallel branch includes a resistor R14, a resistor R16, a capacitor C8, a capacitor C14 and a capacitor C15, one end of the resistor R14, one end of the capacitor C8, one end of the capacitor C14 and one end of the capacitor C15 are connected together as the other end of the second parallel branch, the other end of the resistor R14, the other end of the capacitor C8 and one end of the resistor R16 are connected together and connected to the FB end of the voltage regulator U3, the other end of the resistor R16, the capacitor C14 and the other end of the capacitor C15 are connected together as one end of the second parallel branch,

[0006] The second power supply branch includes a DC-DC step-down regulator U4, a capacitor C11, a capacitor C17, a capacitor C7, a capacitor C9, a capacitor C16, a capacitor C18, a capacitor C19, a resistor R15, a resistor R17, an inductor L2 and a diode D9. The capacitor C11 and the capacitor C17 are connected in parallel to form a third parallel branch. One end of the third parallel branch is connected to the external voltage and to the input end of the regulator U4. The other end of the third parallel branch is connected to the ground end of the regulator U4 and then grounded together. The enable end of the regulator U4 is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit. The BS end of the regulator U4 is connected in series with the capacitor C7 and is respectively connected to one end of the inductor L2, the SW end of the regulator U4, and the negative electrode of the diode D9. The positive electrode of the diode D9 is connected to the positive electrode of the fourth parallel branch. After one end is connected, it is also connected to the ground terminal of the voltage regulator U4 and is grounded together. The other end of the diode L2 is connected to the other end of the fourth parallel branch, and the connection node serves as the output end of the second power supply branch. The fourth parallel instruction includes resistor R15, resistor R17, capacitor C9, capacitor C16, capacitor C18, and capacitor C19. One end of the resistor R15, one end of the capacitor C9, one end of the capacitor C16, one end of the capacitor C18, and one end of the capacitor C19 are connected together and serve as the other end of the fourth parallel branch. The other end of the resistor R15, the other end of the capacitor C9, and one end of the resistor R17 are connected together and connected to the FB end of the voltage regulator U4. The other end of the resistor R17, the other end of the capacitor C16, the other end of the capacitor C18, and the other end of the capacitor C19 are connected together and serve as one end of the fourth parallel branch.

[0007] Furthermore, the parallel capacitors C10 and C13, as well as the parallel capacitors C11 and C17 all play a filtering role, the diodes D8 and D9 act as freewheeling diodes, the inductors L1 and L2 act as energy storage, and the capacitors C14, C15, C16, C18, and C19 act as filtering and energy storage.

[0008] Furthermore, the Bluetooth control circuit includes a Bluetooth chip U2, and two GPIO pins of the Bluetooth chip are respectively connected to the enable end of the voltage regulator U3 in the first power supply branch and the enable end of the voltage regulator U4 in the second power supply branch. The four GPIO pins of the Bluetooth chip are also respectively connected to the MOS tube drive circuit to control the conduction and cutoff of the MOS tube drive circuit.

[0009] Furthermore, the Bluetooth control circuit also includes a switching circuit, which includes a switch RESET_KI, a resistor R11, a resistor R12 and a capacitor C5. A GPIO pin of the Bluetooth chip U2 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to one end of the resistor R11, one end of the capacitor C5, and one end of the switch RESET_KI. The other end of the resistor R11 is connected to the power supply circuit, and the other end of the capacitor C5 is connected to the other end of the switch RESET_KI and then grounded together.

[0010] Furthermore, the Bluetooth control circuit also includes a resistor R6, a resistor R8, a capacitor C2, a capacitor C3, and a capacitor C4. One end of the resistor R6 is connected to the output end of the second power supply branch in the power supply circuit. The other end of the resistor R6 is respectively connected to one end of the capacitor C2, one end of the capacitor C3, and one end of the resistor R8, and then connected to the voltage end of the Bluetooth chip U2. The other end of the capacitor C2 is connected to the other end of the capacitor C3 and then grounded. The other end of the resistor R8 is connected to the enable end of the Bluetooth chip and then connected in series with the capacitor C4 and grounded together with the other end of the capacitor C3.

[0011] Furthermore, the MOS tube driving circuit includes a driving chip U1, a diode D1, a diode D2, and a diode D5. Pins 1, 2, 4, and 5 of the driving chip U1 are respectively connected to pins 32 to 35 of the Bluetooth chip U2 in the Bluetooth control circuit. Pins 10, 11, 15, 18, 16, and 19 of the driving chip U1 are respectively connected to the H-bridge driving circuit.

[0012] The anode of diode D1 is connected to the first power supply circuit in the power supply circuit, the anode of diode D2 is connected to the first power supply circuit in the power supply circuit, the anode of diode D5 is also connected to the first power supply circuit in the power supply circuit, the cathode of diode D1 is connected to pin 20 of driver chip U1, the cathode of diode D2 is connected to pin 17 of driver chip U1, the cathode of diode D5 is connected to pin 14 of driver chip U1, pin 7 of driver chip U1 is connected to the first power supply circuit in the power supply circuit, and the ground terminal of driver chip U1 is grounded.

[0013] Further, the H-bridge driving circuit includes a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, a diode D3, a diode D4, a diode D6, a diode D7, a resistor R1, a resistor R2, a resistor R4, and a resistor R5. The cathode of the diode D3 is connected to one end of the resistor R1 and serves as an access terminal LEDGH_A. The access terminal LEDGH_A is connected to pin 19 of a driving chip U1 in the MOS tube driving circuit. The anode of the diode D3 is connected to the other end of the resistor R1 and then connected to pin 4 of the MOS tube Q1. Pins 5 to 9 of the MOS tube Q1 are connected to pins 5 to 9 of the MOS tube Q2 and then connected to a +24 V voltage. Pins 1 to 3 of the MOS tube Q1 and pins 2 to 9 of the MOS tube Q3 are connected to serve as an access terminal LED_A. The access terminal LED_A is connected to pin 18 of the driving chip U1.

[0014] The cathode of the diode D6 and one end of the resistor R4 are connected together as the access terminal LEDGL_A, and the access terminal LEDGL_A is connected to the pin 11 of the driver chip U1. The anode of the diode D6 is connected to the other end of the resistor R4 and then connected to the pin 4 of the MOS tube Q3. The pins 1 to 3 of the MOS tube Q3 and the pins 1 to 3 of the MOS tube Q4 are connected together and then grounded.

[0015] The cathode of the diode D7 and one end of the resistor R5 are connected together as the access terminal LEDGL_B, and the access terminal LEDGL_B is connected to the pin 10 of the driver chip U1. The anode of the diode D7 and the other end of the resistor R5 are connected together to the pin 4 of the MOS tube Q4. The pins 5 to 9 of the MOS tube Q4 and the pins 1 to 3 of the MOS tube Q2 are connected together as the access terminal LED_B, and the access terminal LED_B is connected to the pin 15 of the driver chip U1.

[0016] The access terminal LED_A is also connected to the cathode of the lamp bead LED1 and the anode of the lamp bead LED2, and the access terminal LED_B is also connected to the anode of the lamp bead LED1 and the cathode of the lamp bead LED2. Both the lamp bead LED1 and the lamp bead LED2 are light emitting diodes, and the color temperatures of the lamp bead LED1 and the lamp bead LED2 are different.

[0017] Furthermore, the four MOS tubes of the H-bridge driving circuit are all N-type enhanced MOS tubes.

[0018] Furthermore, the voltage regulator U3 and the voltage regulator U4 are both DC-DC step-down voltage regulators, whose model is ME3116AM6G, the model of the Bluetooth chip U2 is ESP32-S3-WROOM-1-N4, and the model of the driver chip U1 is EG2134.

[0019] The beneficial effects of the utility model are as follows: the utility model only needs two output lines to realize the color temperature adjustment selection, can be applied to more occasions, and has a high user experience. In addition, in terms of circuit, the circuit level adopts the integrated structure of lamp beads and control circuit, and no external controller drive is required, which makes wiring more convenient and wiring more concise, and can save more installation application space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the framework of the utility model;

[0021] Figure 2 It is a circuit diagram of the utility model;

[0022] Figure 3 for Figure 2 The circuit diagram of the MOS tube driving circuit;

[0023] Figure 4 for Figure 2 Circuit diagram of the H-bridge driving circuit;

[0024] Figure 5 for Figure 2 The circuit diagram of the Bluetooth control circuit;

[0025] Figure 6 for Figure 2 Circuit diagram of the power supply circuit. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation plans:

[0027] like Figure 1-Figure 6As shown, a control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output includes a power supply circuit, and a Bluetooth control circuit, a MOS tube drive circuit and an H-bridge drive circuit all connected to the power supply circuit, and also includes lamp beads LED1 and LED2 connected in parallel, the power supply circuit is used to output different voltages to provide the working voltages required by the Bluetooth control circuit, the MOS tube drive circuit and the H-bridge drive circuit respectively, the output end of the Bluetooth control circuit is connected to the input end of the MOS tube drive circuit, the output end of the MOS tube drive circuit is connected to the input end of the H-bridge drive circuit, and the output end of the H-bridge drive circuit is connected to the lamp beads LED1 and the lamp beads LED2. The Bluetooth control circuit is used to output a first voltage control signal that can control the conduction and cutoff of the MOS tube drive circuit based on the received Bluetooth signal, the MOS tube drive circuit is in the conduction state, the MOS tube drive circuit can output voltage, the MOS tube drive circuit is in the cutoff state, and the MOS tube drive circuit is prohibited from outputting voltage. The MOS tube drive circuit is used to prohibit all MOS tubes in the H-bridge drive circuit from being turned on, and the MOS tube drive circuit has a locking function. The H-bridge driving circuit includes at least two MOS tubes, and the H-bridge driving circuit is used to control the current flow direction of two output circuits connected to the lamp beads LED1 and LED2, so as to control one of the lamp beads LED1 and LED2 to work based on the current flow direction, thereby adjusting the color temperature of the lamp beads.

[0028] The power supply circuit includes a first power supply branch and a second power supply branch, wherein the first power supply branch includes a DC-DC step-down regulator U3, a capacitor C10, a capacitor C13, a capacitor C6, a capacitor C8, a capacitor C14, a capacitor C15, a resistor R14, a resistor R16, an inductor L1 and a diode D8. Capacitors C10 and C13 are connected in parallel to form a first parallel branch, one end of the first parallel branch is connected to an external voltage, the external voltage is 24V (in actual use, an external voltage source of other voltage values ​​can also be connected), one end of the first parallel branch connected to an external voltage is also connected to the input end (pin 5) of the regulator U3, and the other end of the first parallel branch is grounded together with the ground end (pin 2) of the regulator U3. The enable end (pin 4) of the regulator is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit, so that the power supply circuit can realize whether to supply power to the outside under the control of the first voltage control signal sent by the Bluetooth control circuit. The BS terminal (pin 1) of the voltage regulator U3 is connected in series with the capacitor C6 and then connected to one end of the inductor L1. One end of the inductor L1 is also connected to the SW terminal (pin 6) of the voltage regulator U3 and the negative electrode of the diode D8. The positive electrode of the diode D8 is connected to the ground terminal of the voltage regulator U3 and then grounded. The positive electrode of the diode D8 is also connected to one end of the second parallel branch and grounded. The other end of the inductor L1 is connected to the other end of the second parallel branch and the connection node is used as the output end of the first power supply branch to output a +12V voltage. The second parallel branch includes a resistor R14, a resistor R16, a capacitor C8, a capacitor C14 and a capacitor C15. One end of the resistor R14, one end of the capacitor C8, one end of the capacitor C14 and one end of the capacitor C15 are connected together to serve as the other end of the second parallel branch. The other end of the resistor R14, the other end of the capacitor C8 and one end of the resistor R16 are connected together to the FB end (pin 3) of the regulator U3. The other end of the resistor R16, the capacitor C14 and the other end of the capacitor C15 are connected together to serve as one end of the second parallel branch.

[0029] The second power supply branch includes a DC-DC step-down regulator U4, a capacitor C11, a capacitor C17, a capacitor C7, a capacitor C9, a capacitor C16, a capacitor C18, a capacitor C19, a resistor R15, a resistor R17, an inductor L2 and a diode D9. The capacitor C11 and the capacitor C17 are connected in parallel to form a third parallel branch. One end of the third parallel branch is connected to the external voltage and to the input end (pin 5) of the regulator U4. The other end of the third parallel branch is connected to the ground end (pin 2) of the regulator U4 and then grounded together. The enable end (pin 4) of the regulator U4 is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit, so that the power supply circuit can realize whether to supply power to the outside under the control of the first voltage control signal sent by the external Bluetooth control circuit. The BS terminal (pin 1) of the voltage regulator U4 is connected in series with the capacitor C7 and then connected to one end of the inductor L2, the SW terminal (pin 6) of the voltage regulator U4, and the cathode of the diode D9. The anode of the diode D9 is connected to one end of the fourth parallel branch and then connected to the ground terminal of the voltage regulator U4 and grounded together. The other end of the diode L2 is connected to the other end of the fourth parallel branch, and the connection node serves as the output end of the second power supply branch to output a +3.3V voltage. The fourth parallel instruction includes resistor R15, resistor R17, capacitor C9, capacitor C16, capacitor C18, and capacitor C19. One end of resistor R15, one end of capacitor C9, one end of capacitor C16, one end of capacitor C18, and one end of capacitor C19 are connected together and serve as the other end of the fourth parallel branch. The other end of resistor R15, the other end of capacitor C9, and one end of resistor R17 are connected together and connected to the FB end (pin 3) of regulator U4. The other end of resistor R17, the other end of capacitor C16, the other end of capacitor C18, and the other end of capacitor C19 are connected together and serve as one end of the fourth parallel branch.

[0030] Among them, the parallel capacitors C10 and C13, as well as the parallel capacitors C11 and C17 all play a filtering role, so as to eliminate the clutter and then supply power to the voltage regulator U3 and the voltage regulator U4. The model of the voltage regulator U3 and the voltage regulator U4 is ME3116AM6G, and its withstand voltage (i.e., the allowed input voltage) is 0.3V-40V, so the external voltage can be 24V. The diodes D8 and D9 act as freewheeling diodes, and the inductors L1 and L2 act as energy storage. The resistors R14 and R16, as well as the resistors R15 and R17 act as voltage feedback regulators. In the first power supply branch, the output voltage VOUT=0.8*(R14+R16) / R16; in the second power supply branch, the output voltage VOUT=0.8*(R15+R17) / R17. The capacitors C8 and C9 are feedforward capacitors, and their function is to improve the transient response or phase margin of the loop. The functions of capacitors C14, C15, C16, C18 and C19 are filtering and energy storage so as to stably output 12V and 3.3V voltages for use in subsequent stages.

[0031] The Bluetooth control circuit includes a Bluetooth chip U2 and a switch circuit. The Bluetooth chip U2 uses a built-in ESP32-S3 series chip, an Xtensa dual-core 32-bit LX7 microprocessor and a 2.4GHz (802.11 b / g / n) + Bluetooth 5 (LE) Bluetooth module, and its model is ESP32-S3-WROOM-1-N4. The two GPIO pins (pin 19, pin 20) of the Bluetooth chip are respectively connected to the enable end of the regulator U3 in the first power supply branch and the enable end of the regulator U4 in the second power supply branch. The four GPIO pins (pin 32-pin 35) of the Bluetooth chip are also respectively connected to the MOS tube drive circuit to control the conduction and cutoff of the MOS tube drive circuit.

[0032] The switch circuit includes switch RESET_KI, resistor R11, resistor R12 and capacitor C5. A GPIO pin (pin 24) of the Bluetooth chip U2 is connected to one end of the resistor R12. The other end of the resistor R12 is respectively connected to one end of the resistor R11, one end of the capacitor C5 and one end of the switch RESET_KI. The other end of the resistor R11 is connected to the power supply circuit and can be connected to the output end of the second power supply circuit to receive a 3.3V voltage. The other end of the capacitor C5 is connected to the other end of the switch RESET_KI and then grounded. The Bluetooth chip outputs a reset signal through pin 24 to clear the network where the Bluetooth control circuit is located, which is convenient for users to connect, and the lamp can be remotely controlled through software (such as APP).

[0033] In an optional embodiment, the Bluetooth control circuit further includes a resistor R6, a resistor R8, a capacitor C2, a capacitor C3, and a capacitor C4, one end of the resistor R6 is connected to the output end of the second power supply branch in the power supply circuit to access the 3.3V voltage, the other end of the resistor R6 is respectively connected to one end of the capacitor C2, one end of the capacitor C3, and one end of the resistor R8, and then connected to the voltage end (pin 2) of the Bluetooth chip U2, and the other end of the capacitor C2 is connected to the other end of the capacitor C3 and then connected to the ground. The other end of the resistor R8 is connected to the enable end (pin 3) of the Bluetooth chip, and then connected in series with the capacitor C4 and grounded together with the other end of the capacitor C3.

[0034] The MOS tube driving circuit includes a driving chip U1, a diode D1, a diode D2, and a diode D5. The driving chip U1 is a driving chip with a built-in high-power MOS tube, an IGBT tube gate drive, and an integrated three-phase independent half-bridge drive. Its model is EG2134, and the chip has a locking function to prevent the output high and low power tubes from being turned on at the same time. Pins 1, 2 (both HIN pins), pins 4, and pins 5 (both LIN pins) of the driving chip U1 are respectively connected to pins 32 to 35 of the Bluetooth chip U2 in the Bluetooth control circuit, and pins 10, 11 (respectively LO2 pins and LO1 pins), pins 15, 18 (both VS pins), and pins 16 and 19 (both HO pins) of the driving chip U1 are respectively connected to the H-bridge driving circuit.

[0035] The anode of diode D1 is connected to the first power supply circuit in the power supply circuit, the anode of diode D2 is connected to the first power supply circuit in the power supply circuit, and the anode of diode D5 is also connected to the first power supply circuit in the power supply circuit, so that the three diodes are all connected to the +12V voltage, the cathode of diode D1 is connected to pin 20 of driver chip U1, the cathode of diode D2 is connected to pin 17 of driver chip U1, and the cathode of diode D5 is connected to pin 14 of driver chip U1. Pin 7 (i.e., the voltage end) of driver chip U1 is connected to the first power supply circuit in the power supply circuit to connect to the +12V voltage, and the ground end of driver chip U1 is grounded.

[0036] The H-bridge driving circuit includes MOS tube Q1, MOS tube Q2, MOS tube Q3, MOS tube Q4, diode D3, diode D4, diode D6, diode D7, resistor R1, resistor R2, resistor R4, and resistor R5. The cathode of diode D3 is connected to one end of resistor R1 and serves as access terminal LEDGH_A, which is connected to pin 19 of driver chip U1 in MOS tube driving circuit. The anode of diode D3 is connected to the other end of resistor R1 and then connected to pin 4 of MOS tube Q1. Pin 5-pin 9 of MOS tube Q1 and pin 5-pin 9 of MOS tube Q2 are connected to +24V voltage, which can be provided by power supply circuit. Pin 1-pin 3 of MOS tube Q1 and pin 2-pin 9 of MOS tube Q3 are connected to serve as access terminal LED_A, which is connected to pin 18 of driver chip U1.

[0037] The cathode of the diode D6 and one end of the resistor R4 are connected together as the access terminal LEDGL_A, and the access terminal LEDGL_A is connected to the pin 11 of the driver chip U1. The anode of the diode D6 is connected to the other end of the resistor R4 and then connected to the pin 4 of the MOS tube Q3. Pins 1 to 3 of the MOS tube Q3 and pins 1 to 3 of the MOS tube Q4 are connected together and then grounded.

[0038] The cathode of the diode D7 and one end of the resistor R5 are connected together to serve as the access terminal LEDGL_B, and the access terminal LEDGL_B is connected to the pin 10 of the driver chip U1. The anode of the diode D7 and the other end of the resistor R5 are connected together to the pin 4 of the MOS tube Q4, and the pins 5 to 9 of the MOS tube Q4 and the pins 1 to 3 of the MOS tube Q2 are connected together to serve as the access terminal LED_B, and the access terminal LED_B is connected to the pin 15 of the driver chip U1.

[0039] The access terminal LED_A is also connected to the cathode of the lamp bead LED1 and the anode of the lamp bead LED2, and the access terminal LED_B is also connected to the anode of the lamp bead LED1 and the cathode of the lamp bead LED2. The lamp bead LED1 and the lamp bead LED2 are both light emitting diodes, and the color temperatures of the lamp bead LED1 and the lamp bead LED2 are different. For example, the color temperature of the lamp bead LED1 is 6500K, and the color temperature of the lamp bead LED2 is 3000K.

[0040] The GPIO pins 32 to 35 of the Bluetooth module U2 respectively control the pins 1, 2, 4 and 5 of the driver chip U1, thereby outputting control signals through the pins 10 and 11 of the driver chip U1, and then controlling the switches of the MOS tubes Q3 and Q4 through the access terminals LEDGL_A and LEDGL_B, and outputting control signals through the pins 16 and 19 of the driver chip U1, and then controlling the switches of the MOS tubes Q1 and Q2 through the access terminals LEDGH_A and LEDGH_B. The pins 15 and 18 of the driver chip U1 control the floating ground terminals of the MOS tubes Q3 and Q4 through the access terminals LED_A and LED_B, thereby ensuring that the upper power tube group (MOS tube Q1, MOS tube Q2) and the lower power tube group (MOS tube Q3, MOS tube Q4) will not be turned on at the same time.

[0041] The four MOS tubes of the H-bridge driving circuit are all N-type enhanced MOS tubes, which can withstand 60V and 170A driving capacity. The model is HYG025N06LS1C2. The output pins 16 and 19 of the driver chip U1 control the MOS tube Q1 and MOS tube Q2 respectively, and the output pins 10 and 11 of the driver chip U1 control the conduction and cutoff of the MOS tube Q3 and MOS tube Q4 respectively. When pin 19 outputs a high level, the MOS tube Q1 is turned on. Since the driver chip U1 has a locking function, the pin 11 of the driver chip U1 outputs a low level at this time, which makes the MOS tube Q3 cut off. One MOS tube is turned on and the other MOS tube is cut off, in order to prevent the high voltage from being short-circuited to the ground. Similarly, when the pin 16 of the driver chip U1 is at a low level, the MOS tube Q2 is cut off. At this time, the pin 10 of the driver chip U1 is at a high level, so the MOS tube Q4 is turned on. Then the current flows from the access terminal LED_A to the access terminal LED_B. At this time, the lamp bead LED2 is bright and the color temperature is 3000K.

[0042] In the same principle, when the key 19 of the driver chip U1 outputs a low level, the MOS tube Q1 will be turned off. Due to the locking function, the pin 11 of the driver chip U1 is at a high level, and the MOS tube Q3 is turned on; when the key 16 of the driver chip U1 is at a high level, the MOS tube Q2 is turned on; the pin 10 is at a low level, and the MOS tube Q4 is turned off. At this time, the current will flow from the access terminal LED_B to the access terminal LED_A. At this time, the lamp bead LED1 is bright, and the color temperature presented is 6500K. And due to the role of diodes D3, D4, D6 and D7, the MOS tube is turned off faster to reduce losses.

[0043] In summary, only two output lines (i.e., access end LED_A and access end LED_B) are needed to control the direction of current flow, so that the lamp bead with the corresponding color temperature is selected to light up, and the other lamp bead is turned off, so that the color temperature can be adjusted as needed.

[0044] The utility model only needs two output lines to realize the color temperature adjustment selection, which can be applied to more occasions and has a high user experience. In addition, in terms of circuit, the circuit level adopts the integrated structure of lamp beads and control circuit, and no external controller drive is required, which makes wiring more convenient and wiring more concise, and can save more installation application space.

[0045] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A control circuit for adjusting the color temperature of lamp beads with Bluetooth dual-line output, characterized in that: The invention comprises a power supply circuit, a Bluetooth control circuit, a MOS tube driving circuit and an H-bridge driving circuit which are all connected to the power supply circuit, and also comprises a lamp bead LED1 and a lamp bead LED2 which are connected in parallel. The power supply circuit is used to output different voltages to provide the working voltages required by the Bluetooth control circuit, the MOS tube driving circuit and the H-bridge driving circuit respectively. The output end of the Bluetooth control circuit is connected to the input end of the MOS tube driving circuit, the output end of the MOS tube driving circuit is connected to the input end of the H-bridge driving circuit, the output end of the H-bridge driving circuit is connected to the lamp bead LED1 and the lamp bead LED2. The Bluetooth control circuit is used to output a first voltage control signal which can control the conduction and cut-off of the MOS tube driving circuit based on the received Bluetooth signal. The MOS tube driving circuit is used to prohibit all MOS tubes in the H-bridge driving circuit from being conducted, and the MOS tube driving circuit has a locking function. The H-bridge driving circuit comprises at least two MOS tubes, and the H-bridge driving circuit is used to control the current flow direction of two output circuits connected to the lamp bead LED1 and the lamp bead LED2.

2. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 1, characterized in that: The power supply circuit includes a first power supply branch and a second power supply branch. The first power supply branch includes a DC-DC step-down regulator U3, a capacitor C10, a capacitor C13, a capacitor C6, a capacitor C8, a capacitor C14, a capacitor C15, a resistor R14, a resistor R16, an inductor L1 and a diode D8. The capacitor C10 and the capacitor C13 are connected in parallel to form a first parallel branch. One end of the first parallel branch is connected to an external voltage. One end of the first parallel branch connected to an external voltage is also connected to the input end of the regulator U3. The other end of the first parallel branch is grounded together with the ground end of the regulator U3. The enable end of the regulator is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit. The BS end of the regulator U3 is connected in series with the capacitor C6 and then connected to one end of the inductor L1. One end of the inductor L1 is also respectively connected to the SW end, The cathode of the diode D8 is connected, the anode of the diode D8 is connected to the ground terminal of the voltage regulator U3 and then grounded together, the anode of the diode D8 is also connected to one end of the second parallel branch and grounded together, the other end of the inductor L1 is connected to the other end of the second parallel branch and the connection node serves as the output end of the first power supply branch, the second parallel branch includes a resistor R14, a resistor R16, a capacitor C8, a capacitor C14 and a capacitor C15, one end of the resistor R14, one end of the capacitor C8, one end of the capacitor C14 and one end of the capacitor C15 are connected together as the other end of the second parallel branch, the other end of the resistor R14, the other end of the capacitor C8 and one end of the resistor R16 are connected together and connected to the FB end of the voltage regulator U3, the other end of the resistor R16, the capacitor C14 and the other end of the capacitor C15 are connected together as one end of the second parallel branch, The second power supply branch includes a DC-DC step-down regulator U4, a capacitor C11, a capacitor C17, a capacitor C7, a capacitor C9, a capacitor C16, a capacitor C18, a capacitor C19, a resistor R15, a resistor R17, an inductor L2 and a diode D9. The capacitor C11 and the capacitor C17 are connected in parallel to form a third parallel branch. One end of the third parallel branch is connected to the external voltage and to the input end of the regulator U4. The other end of the third parallel branch is connected to the ground end of the regulator U4 and then grounded together. The enable end of the regulator U4 is connected to the Bluetooth control circuit to receive the first voltage control signal output by the Bluetooth control circuit. The BS end of the regulator U4 is connected in series with the capacitor C7 and is respectively connected to one end of the inductor L2, the SW end of the regulator U4, and the negative electrode of the diode D9. The positive electrode of the diode D9 is connected to the positive electrode of the fourth parallel branch. After one end is connected, it is also connected to the ground terminal of the voltage regulator U4 and is grounded together. The other end of the diode L2 is connected to the other end of the fourth parallel branch, and the connection node serves as the output end of the second power supply branch. The fourth parallel instruction includes resistor R15, resistor R17, capacitor C9, capacitor C16, capacitor C18, and capacitor C19. One end of the resistor R15, one end of the capacitor C9, one end of the capacitor C16, one end of the capacitor C18, and one end of the capacitor C19 are connected together and serve as the other end of the fourth parallel branch. The other end of the resistor R15, the other end of the capacitor C9, and one end of the resistor R17 are connected together and connected to the FB end of the voltage regulator U4. The other end of the resistor R17, the other end of the capacitor C16, the other end of the capacitor C18, and the other end of the capacitor C19 are connected together and serve as one end of the fourth parallel branch.

3. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 2, characterized in that: The parallel capacitors C10 and C13, as well as the parallel capacitors C11 and C17 all play a filtering role, the diodes D8 and D9 act as freewheeling diodes, the inductors L1 and L2 act as energy storage, and the capacitors C14 and C15, as well as the capacitors C16, C18, and C19 act as filtering and energy storage.

4. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 2, characterized in that: The Bluetooth control circuit includes a Bluetooth chip U2, two GPIO pins of the Bluetooth chip are respectively connected to the enable end of the voltage regulator U3 in the first power supply branch and the enable end of the voltage regulator U4 in the second power supply branch, and the four GPIO pins of the Bluetooth chip are also respectively connected to the MOS tube drive circuit to control the conduction and cutoff of the MOS tube drive circuit.

5. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 4, characterized in that: The Bluetooth control circuit also includes a switching circuit, which includes a switch RESET_KI, a resistor R11, a resistor R12 and a capacitor C5. A GPIO pin of the Bluetooth chip U2 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to one end of the resistor R11, one end of the capacitor C5, and one end of the switch RESET_KI. The other end of the resistor R11 is connected to the power supply circuit, and the other end of the capacitor C5 is connected to the other end of the switch RESET_KI and then grounded together.

6. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 5, characterized in that: The Bluetooth control circuit also includes a resistor R6, a resistor R8, a capacitor C2, a capacitor C3, and a capacitor C4. One end of the resistor R6 is connected to the output end of the second power supply branch in the power supply circuit. The other end of the resistor R6 is respectively connected to one end of the capacitor C2, one end of the capacitor C3, and one end of the resistor R8, and then connected to the voltage end of the Bluetooth chip U2. The other end of the capacitor C2 is connected to the other end of the capacitor C3 and then grounded. The other end of the resistor R8 is connected to the enable end of the Bluetooth chip and then connected in series with the capacitor C4 and grounded together with the other end of the capacitor C3.

7. The control circuit for adjusting lamp color temperature by Bluetooth dual-wire output according to claim 6, characterized in that: The MOS tube driving circuit includes a driving chip U1, a diode D1, a diode D2, and a diode D5. Pins 1, 2, 4, and 5 of the driving chip U1 are respectively connected to pins 32 to 35 of the Bluetooth chip U2 in the Bluetooth control circuit. Pins 10, 11, 15, 18, 16, and 19 of the driving chip U1 are respectively connected to the H-bridge driving circuit. The anode of diode D1 is connected to the first power supply circuit in the power supply circuit, the anode of diode D2 is connected to the first power supply circuit in the power supply circuit, the anode of diode D5 is also connected to the first power supply circuit in the power supply circuit, the cathode of diode D1 is connected to pin 20 of driver chip U1, the cathode of diode D2 is connected to pin 17 of driver chip U1, the cathode of diode D5 is connected to pin 14 of driver chip U1, pin 7 of driver chip U1 is connected to the first power supply circuit in the power supply circuit, and the ground terminal of driver chip U1 is grounded.

8. The control circuit for adjusting the color temperature of lamp beads by Bluetooth dual-wire output according to claim 7, characterized in that: The H-bridge driving circuit includes a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, a diode D3, a diode D4, a diode D6, a diode D7, a resistor R1, a resistor R2, a resistor R4, and a resistor R5. The cathode of the diode D3 is connected to one end of the resistor R1 and serves as an access terminal LEDGH_A. The access terminal LEDGH_A is connected to the pin 19 of the driving chip U1 in the MOS tube driving circuit. The anode of the diode D3 is connected to the other end of the resistor R1 and then connected to the pin 4 of the MOS tube Q1. The pins 5 to 9 of the MOS tube Q1 are connected to the pins 5 to 9 of the MOS tube Q2 and then connected to a +24V voltage. The pins 1 to 3 of the MOS tube Q1 and the pins 2 to 9 of the MOS tube Q3 are connected to serve as the access terminal LED_A. The access terminal LED_A is connected to the pin 18 of the driving chip U1. The cathode of the diode D6 and one end of the resistor R4 are connected together as the access terminal LEDGL_A, and the access terminal LEDGL_A is connected to the pin 11 of the driver chip U1. The anode of the diode D6 is connected to the other end of the resistor R4 and then connected to the pin 4 of the MOS tube Q3. The pins 1 to 3 of the MOS tube Q3 and the pins 1 to 3 of the MOS tube Q4 are connected together and then grounded. The cathode of the diode D7 and one end of the resistor R5 are connected together as the access terminal LEDGL_B, and the access terminal LEDGL_B is connected to the pin 10 of the driver chip U1. The anode of the diode D7 and the other end of the resistor R5 are connected together to the pin 4 of the MOS tube Q4. The pins 5 to 9 of the MOS tube Q4 and the pins 1 to 3 of the MOS tube Q2 are connected together as the access terminal LED_B, and the access terminal LED_B is connected to the pin 15 of the driver chip U1. The access terminal LED_A is also connected to the cathode of the lamp bead LED1 and the anode of the lamp bead LED2, and the access terminal LED_B is also connected to the anode of the lamp bead LED1 and the cathode of the lamp bead LED2. Both the lamp bead LED1 and the lamp bead LED2 are light emitting diodes, and the color temperatures of the lamp bead LED1 and the lamp bead LED2 are different.

9. The control circuit for adjusting lamp color temperature by Bluetooth dual-wire output according to claim 8, characterized in that: The four MOS tubes of the H-bridge drive circuit are all N-type enhanced MOS tubes.

10. The control circuit for adjusting lamp color temperature by Bluetooth dual-wire output according to claim 8, characterized in that: The voltage regulator U3 and the voltage regulator U4 are both DC-DC step-down voltage regulators, and their model is ME3116AM6G. The model of the Bluetooth chip U2 is ESP32-S3-WROOM-1-N4, and the model of the driver chip U1 is EG2134.

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