Head tracking spatial audio soundfield rendering circuit

Abstract

The utility model relates to a kind of head tracking spatial audio sound field restoration circuit, including main control chip, loudspeaker unit, ear detection sensor and motion sensing unit, the main control chip is the main control chip U1 of built-in MCU and bluetooth chip, it is used for wireless connection mobile terminal;It further includes the first power supply circuit for the power supply of ear detection sensor, the enable end of the main control chip U1 connection first power supply circuit to control whether first power supply circuit supplies power to ear detection sensor;It is higher in the degree of integration, and circuit structure design is simple, greatly reduce the manufacturing cost of this product;Enhance the anti-interference ability of ear detection sensor, avoid interference sensor weak capacitance signal, and, also, can control the switch of ear detection sensor in time by controlling first power supply circuit.

Description

Technical Field

[0001] This utility model relates to the field of head tracking spatial audio sound field restoration circuit technology, and in particular to a head tracking spatial audio sound field restoration circuit. Background Technology

[0002] Over-ear headphones, as the name suggests, are worn on the head and not inserted into the ear canal, unlike in-ear headphones. The fact that over-ear headphones don't need to be inserted helps protect the eardrums from damage.

[0003] Existing headphones on the market only offer stereo sound. When worn on the head, the sound field is fixed relative to the user's head. The user perceives the sound source as always moving with the head, meaning the sound source is always at the head's position. The sound lacks a sense of real space, making it difficult to perceive the sound source's location and create an immersive experience, especially in scenarios like watching movies.

[0004] Later, a head-tracking spatial audio sound field restoration circuit and headphones with authorization announcement number CN217883768 U appeared. Although it can achieve sound field adjustment and the user's perceived sound source position can always be at the original sound source position, enhancing the immersive live experience, it still has the following drawbacks: the main control chip and communication unit are set up separately, the integration level is low, the circuit structure design is complex, and the cost is high.

[0005] Therefore, in this utility model patent application, the applicant has carefully researched a head tracking spatial audio sound field restoration circuit to solve the above problems. Utility Model Content

[0006] This invention addresses the shortcomings of the existing technology by providing a head-tracking spatial audio sound field restoration circuit with a high degree of integration, simple circuit structure design, and significantly reduced manufacturing costs. It also enhances the anti-interference capability of the in-ear detection sensor, avoids interference with the sensor's weak capacitance signal, and allows for timely control of the first power supply circuit to control the switching of the in-ear detection sensor.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A head-tracking spatial audio sound field restoration circuit includes a main control chip, a speaker unit, an in-ear detection sensor, and a motion sensing unit. The speaker unit is connected to the main control chip for outputting audio, and the motion sensing unit is connected to the main control chip for capturing human head movements. The motion sensing unit generates motion signals based on human head movements and transmits these signals to the main control chip. The main control chip further processes audio signals based on the motion signals and controls the speaker unit to play corresponding audio, ensuring that the sensed sound source position remains at the original sound source position. The in-ear detection sensor is connected to the main control chip and is used to detect whether the earphone is being worn. The main control chip is also used to control the speaker unit to play sound when the in-ear detection sensor detects that the earphone is being worn, and to control the speaker unit to stop playing sound when the earphone is not being worn. The main control chip is a main control chip U1 with a built-in MCU and Bluetooth chip, which is used to wirelessly connect to a mobile terminal. It also includes a first power supply circuit for supplying power to the in-ear detection sensor. The main control chip U1 is connected to the enable terminal of the first power supply circuit to control whether the first power supply circuit supplies power to the in-ear detection sensor.

[0009] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, the main control chip U1 is a built-in MCU and Bluetooth chip, with a high degree of integration and a simple circuit structure design, which greatly reduces the manufacturing cost of this product. In particular, the in-ear detection sensor uses an independent first power supply circuit to enhance the anti-interference capability of the in-ear detection sensor, avoid interference with the sensor's weak capacitance signal, and can also control the first power supply circuit in a timely manner to control the switching of the in-ear detection sensor.

[0010] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0011] Figure 1 This is a general control principle block diagram of an embodiment of the present utility model;

[0012] Figure 2 This is a circuit diagram of the first part of the battery charging circuit according to an embodiment of the present utility model;

[0013] Figure 3 This is a circuit diagram of the second part of the battery charging circuit according to an embodiment of the present invention;

[0014] Figure 4 This is a circuit diagram of the first power supply circuit according to an embodiment of the present utility model;

[0015] Figure 5 This is a circuit diagram of the second power supply circuit according to an embodiment of the present utility model;

[0016] Figure 6 This is a circuit diagram of an RGB indicator circuit according to an embodiment of the present invention;

[0017] Figure 7 This is a circuit diagram of the first filter circuit according to an embodiment of the present utility model;

[0018] Figure 8 This is a circuit diagram of the second filter circuit according to an embodiment of the present invention;

[0019] Figure 9 This is a circuit diagram of the third filter circuit according to an embodiment of the present invention;

[0020] Figure 10 This is a circuit diagram of the fourth filter circuit according to an embodiment of the present invention;

[0021] Figure 11 This is a circuit diagram of the fifth filter circuit according to an embodiment of the present invention;

[0022] Figure 12 This is a circuit diagram of a speaker filter circuit according to an embodiment of the present invention;

[0023] Figure 13 This is a circuit diagram of a motion sensing unit according to an embodiment of the present invention;

[0024] Figure 14 This is a circuit diagram of an in-ear detection sensor according to an embodiment of the present invention;

[0025] Figure 15 This is a circuit diagram of the button circuit according to an embodiment of the present utility model;

[0026] Figure 16 This is a circuit diagram of a battery power supply circuit according to an embodiment of the present invention;

[0027] Figure 17 This is a circuit diagram of the first part of the main control chip U1 in an embodiment of this utility model;

[0028] Figure 18 This is a circuit diagram of the second part of the main control chip U1 in an embodiment of this utility model;

[0029] Figure 19 This is a circuit diagram of the third part of the main control chip U1 in an embodiment of this utility model;

[0030] Figure 20 This is a circuit diagram of the fourth part of the main control chip U1 in an embodiment of this utility model. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 20 As shown, a head-tracking spatial audio sound field restoration circuit includes a main control chip, a speaker unit, an in-ear detection sensor, and a motion sensing unit 12. The speaker unit is connected to the main control chip for outputting audio. In this embodiment, the main control chip is connected to the speaker unit through a speaker filtering circuit. Preferably, the speaker unit includes a left speaker 111 and a right speaker 112. The speaker filtering circuit includes a first speaker filtering circuit 113 and a second speaker filtering circuit 114. The main control chip is connected to the left speaker 111 through the first speaker filtering circuit 113 and to the right speaker 112 through the second speaker filtering circuit 114.

[0033] In this embodiment, both the first speaker filter circuit 113 and the second speaker filter circuit 114 include a thirtieth resistor, a thirty-first resistor, a thirtieth ferrite bead, a thirty-first ferrite bead, a thirtieth capacitor, a thirty-first capacitor, a first ESD diode, a second ESD diode, and a speaker positive terminal interface and a speaker negative terminal interface.

[0034] The motion sensing unit 12 is connected to the main control chip to capture human head movements; wherein, the motion sensing unit 12 is used to generate motion signals based on human head movements and transmit the motion signals to the main control chip; in this embodiment, as... Figure 13 As shown, this is one specific circuit structure of the motion sensing unit 12. The motion sensing unit 12 is composed of a chip U19 of model LSM6DS0ETR3 and its peripheral circuits. The chip U19 is an IMU sensor that integrates an accelerometer and a gyroscope (6 axes), supports high-precision motion tracking, and communicates with the main control chip via I2C.

[0035] The main control chip is also used to process audio signals based on the motion signals and control the speaker unit to play corresponding audio, so that the perceived sound source position is always at the origin sound source position. In this embodiment, as... Figures 17 to 20 As shown, the main control chip is a main control chip U1 with a built-in MCU and Bluetooth chip, which is used for wireless connection to the mobile terminal 20. The mobile terminal 20 has an app that provides "sound field following intensity" adjustment (0-100%).

[0036] The in-ear detection sensor 13 is connected to the main control chip and is used to detect whether the earphones are being worn. The main control chip is also used to control the speaker unit to play sound when the in-ear detection sensor 13 detects that the earphones are being worn, and to control the speaker unit to stop playing sound when the earphones are not being worn. In this embodiment, as... Figure 14As shown, this is one specific circuit structure of the in-ear detection sensor 13. The in-ear detection sensor 13 is composed of a chip U3 of model number HX9031 and its peripheral circuits. The main control chip U1 is also used to control the motion sensing unit 12 to work when the in-ear detection sensor 13 detects that the earphone is being worn, and to control the motion sensing unit 12 to stop working when the earphone is not being worn.

[0037] It also includes a left feedforward microphone 141, a right feedforward microphone 142, a left rear feedforward microphone 143, a right rear feedforward microphone 144, a pickup microphone 145, an RGB indicator circuit 16, and a first power supply circuit for powering the in-ear detection sensor 13. The main control chip U1 is connected to the enable terminal of the first power supply circuit to control whether the first power supply circuit powers the in-ear detection sensor 13.

[0038] In this embodiment, as Figure 4 As shown, the first power supply circuit includes chip U4, ferrite bead L9, capacitor C65, capacitor C64, resistor R15, and resistor R32. Pin 4 of chip U4 is used to connect to the battery voltage input terminal VBAT. One end of capacitor C64 is connected to pin 4 of chip U4. Pins 2 and 5 of chip U4 and the other end of capacitor C64 are all grounded. Pin 1 of chip U4 is grounded through capacitor C65. One end of ferrite bead L9 is connected to pin 1 of chip U4, and the other end of ferrite bead L9 is connected to the in-ear detection sensor 13 to supply power to the in-ear detection sensor 13. Pin 3 of chip U4 is the enable terminal of the first power supply circuit. Pin K10 GPIO_84 of the main control chip U1 is connected to pin 3 of chip U4 through resistor R15. Pin 3 of chip U4 is grounded through resistor R32.

[0039] The main control chip U1 is connected to the pickup microphone 145, the left feedforward microphone 141, the right feedforward microphone 142, the left feedback microphone 143, and the right feedback microphone 144.

[0040] In this embodiment, the main control chip U1 is connected to the pickup microphone 145 through the first filter circuit 151, the main control chip U1 is connected to the left feedforward microphone 141 through the second filter circuit 152, the main control chip U1 is connected to the left feedback microphone 143 through the third filter circuit 153, the main control chip U1 is connected to the left feedback microphone 143 through the fourth filter circuit 154, and the main control chip U1 is connected to the right feedback microphone 144 through the fifth filter circuit 155.

[0041] The first filter circuit 151 to the fifth filter circuit 155 each include a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a microphone interface;

[0042] The first resistor and the second resistor are connected in series. The non-series node of the first resistor is connected to the main control chip U1. The series node of the first resistor and the second resistor is grounded through the third capacitor. The non-series node of the second resistor is connected to pin 1 of the microphone interface. One end of the third resistor is grounded, and the other end of the third resistor is connected to pin 2 of the microphone interface.

[0043] Pin 1 of the microphone interface is connected to the main control chip U1 through the first capacitor, and pin 1 of the microphone interface is grounded through the fourth capacitor.

[0044] Pin 2 of the microphone interface is connected to the main control chip U1 through the second capacitor, and pin 2 of the microphone interface is grounded through the fifth capacitor.

[0045] In this embodiment, as Figure 7 As shown, the first resistor, second resistor, third resistor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, and microphone interface of the first filter circuit 151 are respectively resistor R162, resistor R163, resistor R164, capacitor C37, capacitor C49, capacitor C50, capacitor C52, capacitor C51, and microphone interface J5.

[0046] The A2 pin MIC1_P of the main control chip U1 is connected to one end of capacitor C37, the A3 pin MIC1_N of the main control chip U1 is connected to one end of capacitor C49, the E10 pin VMIC1 of the main control chip U1 is connected to one end of resistor R162, and the microphone interface J5 is connected to the pickup microphone 145. Thus, it is electrically connected to the pickup microphone 145.

[0047] In this embodiment, as Figure 8 As shown, the first resistor, second resistor, third resistor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, and microphone interface of the second filter circuit 152 are respectively resistor R19, resistor R20, resistor R21, capacitor C20, capacitor C25, capacitor C26, capacitor C30, capacitor C29, and microphone interface J2.

[0048] The B1 pin MIC2_P of the main control chip U1 is connected to one end of capacitor C20, the C1 pin MIC2_N of the main control chip U1 is connected to one end of capacitor C25, the E10 pin VMIC1 of the main control chip U1 is connected to one end of resistor R19, and the microphone interface J2 is connected to the left feedforward microphone 141. Thus, it is electrically connected to the left feedforward microphone 141.

[0049] In this embodiment, as Figure 9As shown, the first resistor, second resistor, third resistor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, and microphone interface of the third filter circuit 153 are respectively resistor R22, resistor R23, resistor R25, capacitor C31, capacitor C32, capacitor C33, capacitor C36, capacitor C34, and microphone interface J3.

[0050] The C2 pin MIC3_P of the main control chip U1 is connected to one end of the capacitor C31, the D2 pin MIC3_N of the main control chip U1 is connected to one end of the capacitor C32, the E10 pin VMIC1 of the main control chip U1 is connected to one end of the resistor R22, and the microphone interface J3 is connected to the left rear feed microphone 143. Thus, it is electrically connected to the left rear feed microphone 143.

[0051] In this embodiment, as Figure 10 As shown, the first resistor, second resistor, third resistor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, and microphone interface of the fourth filter circuit 154 are respectively resistor R26, resistor R27, resistor R28, capacitor C38, capacitor C47, capacitor C48, capacitor C54, capacitor C53, and microphone interface J4.

[0052] The G1 pin MIC4_P of the main control chip U1 is connected to one end of capacitor C38, the H1 pin MIC4_N of the main control chip U1 is connected to one end of capacitor C47, the C10 pin VMIC2 of the main control chip U1 is connected to one end of resistor R26, and the microphone interface J4 is connected to the left rear feed microphone 143. Thus, it is electrically connected to the left rear feed microphone 143.

[0053] In this embodiment, as Figure 11 As shown, the first resistor, second resistor, third resistor, first capacitor, second capacitor, third capacitor, fourth capacitor, fifth capacitor, and microphone interface of the fifth filter circuit 155 are respectively resistor R29, resistor R30, resistor R31, capacitor C55, capacitor C56, capacitor C57, capacitor C60, capacitor C58, and microphone interface J6. The D1 pin MIC5_P of the main control chip U1 is connected to one end of capacitor C55, the E1 pin MIC5_N of the main control chip U1 is connected to one end of capacitor C56, the C10 pin VMIC2 of the main control chip U1 is connected to one end of resistor R57, and the microphone interface J6 is connected to the right rear feed microphone 144, thus electrically connecting to the right rear feed microphone 144.

[0054] The RGB indicator circuit 16 is connected to the main control chip U1 to control the RGB chip in the RGB indicator circuit 16 to light up. In this embodiment, Figure 6The diagram shows one specific circuit structure of the RGB indicator circuit 16. The RGB indicator circuit 16 includes an RGB chip D3, a first driving circuit 161, a second driving circuit 162, and a third driving circuit 163. The N2 pin GPIO_37 of the main control chip U1 is connected to pin 1 of the RGB chip D3 through the first driving circuit 161; the P2 pin GPIO_36 of the main control chip U1 is connected to pin 2 of the RGB chip D3 through the second driving circuit 162; the K5 pin GPIO_35 of the main control chip U1 is connected to pin 4 of the RGB chip D3 through the third driving circuit 163; and pin 3 of the RGB chip D3 is connected to the VCC_3V3 voltage terminal. When it is necessary to drive the R, G, or B LEDs of the RGB chip D3 to light up, a high-level output is simply needed to the corresponding driving circuit. Each of the first driving circuit 161 to the third driving circuit 163 includes a fourth resistor, a fifth resistor, a MOSFET, a sixth resistor, and a Zener diode.

[0055] It also includes a button circuit 17, a battery power supply circuit for powering the main control chip U1, a battery charging circuit for charging the battery of the battery power supply circuit, and a second power supply circuit for powering the RGB indicator circuit 16. The main control chip U1 is connected to the enable terminal of the second power supply circuit to control whether the second power supply circuit powers the RGB indicator circuit 16.

[0056] In this embodiment, Figure 15 The diagram shows one specific circuit structure of the button circuit 17, which includes a power button S1, a volume up button S2, a volume down button S3, and an active noise cancellation button S4. The K7 pin GPIO_82 of the main control chip U1 is connected to the active noise cancellation button S4, the M7 pin GPIO_47 of the main control chip U1 is connected to the volume up button S2, the L7 pin GPIO_47 of the main control chip U1 is connected to the volume down button S3, and the E7 pin PWRON of the main control chip U1 is connected to the power button S1.

[0057] In this embodiment, Figure 16 The diagram shows one specific circuit structure of a battery-powered circuit. The battery-powered circuit includes a battery with an output voltage of 3.7V. The positive terminal of the battery is the B+ voltage terminal, and the negative terminal is the B- voltage terminal. In this embodiment, Figure 2 and Figure 3 The diagram shows one specific circuit structure for a battery charging circuit. The battery charging circuit consists of a CL4056D chip U5 and its peripheral circuitry. Pin 7 of chip U5 is connected to pin M2 (GPIO_51) of the main control chip U1 via resistor R43 to send a signal to the main control chip U1 after the battery is fully charged. To monitor the battery temperature, the B- voltage terminal is connected to pin 1 of chip U5 via an NTC resistor, which is used to detect the battery temperature.

[0058] In this embodiment, Figure 5 The diagram shows one specific circuit structure of the second power supply circuit. The second power supply circuit includes chip U6, ferrite bead L59, capacitor C90, capacitor C84, resistor R52, and resistor R55.

[0059] Pin 4 of chip U6 is used to connect to the battery voltage input terminal VBAT. One end of capacitor C84 is connected to pin 4 of chip U6. Pins 2 and 5 of chip U6 and the other end of capacitor C84 are all grounded. Pin 1 of chip U6 is grounded through capacitor C90. One end of ferrite bead L59 is connected to pin 1 of chip U6, and the other end of ferrite bead L59 is connected to in-ear detection sensor 13 to supply power to in-ear detection sensor 13. Pin 3 of chip U6 is the enable terminal of the first power supply circuit. Pin K10 of main control chip U1, GPIO_84, is connected to pin 3 of chip U6 through resistor R52. Pin 3 of chip U6 is grounded through resistor R55.

[0060] The key design features of this invention are that the main control chip U1 is a built-in MCU and Bluetooth chip, with a high degree of integration and a simple circuit structure design, which greatly reduces the manufacturing cost of this product. In particular, the in-ear detection sensor uses an independent first power supply circuit to enhance the anti-interference capability of the in-ear detection sensor, avoid interference with the sensor's weak capacitance signal, and also control the first power supply circuit in a timely manner to control the switching of the in-ear detection sensor.

[0061] Secondly, the main control chip U1 can also control the sleep state of the motion sensing unit through the in-ear detection sensor. The motion sensing unit is activated only when the user is detected wearing the earphone, and enters sleep mode when the user is detected removing the earphone, thereby reducing the power consumption of the motion sensing unit.

[0062] Furthermore, active noise cancellation can be achieved through the left feedforward microphone, right feedforward microphone, left feedback microphone, right feedback microphone, and corresponding filtering circuits, which helps to reduce or avoid high-frequency fluctuations in the sound field, thereby improving the user experience.

[0063] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A head-tracking spatial audio sound field restoration circuit, comprising a main control chip, a speaker unit, an in-ear detection sensor, and a motion sensing unit, wherein the speaker unit is connected to the main control chip for outputting audio, and the motion sensing unit is connected to the main control chip for capturing human head movements; wherein, The motion sensing unit is used to generate motion signals based on human head movements and transmit the motion signals to the main control chip; the main control chip is also used to process audio signals based on the motion signals and control the speaker unit to play corresponding audio, so that the sensed sound source position is always at the origin sound source position; the in-ear detection sensor is connected to the main control chip and is used to detect whether the headphones are being worn; wherein, the main control chip is also used to control the speaker unit to play sound when the in-ear detection sensor detects that the headphones are being worn, and to control the speaker unit to stop playing sound when the headphones are not being worn, characterized in that: The main control chip is a U1 main control chip with a built-in MCU and Bluetooth chip, which is used for wireless connection to mobile terminals. It also includes a first power supply circuit for powering the in-ear detection sensor, wherein the main control chip U1 is connected to the enable terminal of the first power supply circuit to control whether the first power supply circuit powers the in-ear detection sensor.

2. The head-tracking spatial audio sound field restoration circuit according to claim 1, characterized in that: The main control chip U1 is also used to control the motion sensing unit to work when the in-ear detection sensor detects that the headphones are being worn, and to control the motion sensing unit to stop working when the headphones are not being worn.

3. The head-tracking spatial audio sound field restoration circuit according to claim 1, characterized in that: The first power supply circuit includes chip U4, ferrite bead L9, capacitor C65, capacitor C64, resistor R15, and resistor R32. Pin 4 of chip U4 is used to connect to the battery voltage input terminal VBAT. One end of capacitor C64 is connected to pin 4 of chip U4. Pins 2 and 5 of chip U4 and the other end of capacitor C64 are all grounded. Pin 1 of chip U4 is grounded through capacitor C65. One end of ferrite bead L9 is connected to pin 1 of chip U4, and the other end of ferrite bead L9 is connected to the in-ear detection sensor to supply power to the in-ear detection sensor. Pin 3 of chip U4 is the enable terminal of the first power supply circuit. Pin K10 of the main control chip U1, GPIO_84, is connected to pin 3 of chip U4 through resistor R15. Pin 3 of chip U4 is grounded through resistor R32.

4. The head-tracking spatial audio sound field restoration circuit according to claim 1, characterized in that: It also includes a pickup microphone, a left feed-forward microphone, a right feed-forward microphone, a left feed-back microphone, and a right feed-back microphone; The main control chip U1 is connected to the pickup microphone, the left feedforward microphone, the right feedforward microphone, the left feedback microphone, and the right feedback microphone.

5. The head-tracking spatial audio sound field restoration circuit according to claim 4, characterized in that: The main control chip U1 is connected to the microphone through the first filter circuit, the main control chip U1 is connected to the left feedforward microphone through the second filter circuit, the main control chip U1 is connected to the left feedback microphone through the third filter circuit, the main control chip U1 is connected to the left feedback microphone through the fourth filter circuit, and the main control chip U1 is connected to the right feedback microphone through the fifth filter circuit.

6. The head-tracking spatial audio sound field restoration circuit according to claim 5, characterized in that: Each of the first to fifth filter circuits includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a microphone interface; The first resistor and the second resistor are connected in series. The non-series node of the first resistor is connected to the main control chip U1. The series node of the first resistor and the second resistor is grounded through the third capacitor. The non-series node of the second resistor is connected to pin 1 of the microphone interface. One end of the third resistor is grounded, and the other end of the third resistor is connected to pin 2 of the microphone interface. Pin 1 of the microphone interface is connected to the main control chip U1 through the first capacitor, and pin 1 of the microphone interface is grounded through the fourth capacitor. Pin 2 of the microphone interface is connected to the main control chip U1 through the second capacitor, and pin 2 of the microphone interface is grounded through the fifth capacitor.

7. The head-tracking spatial audio sound field restoration circuit according to claim 1, characterized in that: It also includes an RGB indicator circuit, which is connected to the main control chip U1.

8. The head-tracking spatial audio sound field restoration circuit according to claim 7, characterized in that: It also includes a second power supply circuit for supplying power to the RGB indicator circuit. The main control chip U1 is connected to the enable terminal of the second power supply circuit to control whether the second power supply circuit supplies power to the RGB indicator circuit.

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