Bluetooth module control circuit capable of being shut down quickly

Abstract

The utility model discloses a Bluetooth module control circuit capable of being shut down quickly. The Bluetooth module control circuit comprises a Bluetooth module, a voltage conversion module and an input detection module, the input detection module is electrically connected with the voltage conversion module and the Bluetooth module. The voltage conversion module is also electrically connected with the Bluetooth module; the input detection module comprises a voltage stabilizing unit; the voltage conversion module comprises a conversion chip; the input end of the voltage conversion module is electrically connected with the input end of the input detection module, and an enabling pin of the conversion chip is electrically connected with the output end of the voltage stabilization unit: when the power switch is pressed down, the voltage output of the output end of the voltage stabilization unit is reduced to zero within a specified time, so that the conversion chip is turned off to quickly turn off. By implementing the invention, the voltage input of the enabling pin can be reduced to zero in a relatively short time, so that the shutdown time is greatly shortened, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power on / off control, in particular to a Bluetooth module control circuit capable of rapid power off. Background Art

[0002] Many electronic products now use single-chip microcomputers to control Bluetooth modules in circuit design, and require the Bluetooth modules to have an automatic wake-up function. The specific principle is: the AC line comes in, the switching power supply outputs DC24V, and the lithium battery is fully charged with 12.6 voltage, which is sent to the input end of the DC TO DC chip at the same time. After the voltage is stepped down, the output is 5V DC voltage to power the Bluetooth module. When the power switch is pressed and the AC line is unplugged in the shutdown state, the machine will automatically turn on.

[0003] The problem is that when the power switch is pressed, the two electrolytic capacitors of the voltage input module are already fully charged. Since the voltage across the capacitors cannot change suddenly after power failure, but discharges slowly, this process is measured to last about 90 seconds. It is equivalent to a power supply, which continuously supplies power to the EN pin of the DC TO DC for 90 seconds. At this time, the DC TO DC chip continuously outputs 5V power to power the Bluetooth module. Since the Bluetooth module is powered on, the software configuration of the Bluetooth module is: when the power supply pin BAT pin of the Bluetooth module detects a 4.3V level, it will automatically power on when it is powered on. Therefore, after unplugging the AC line, if the BAT pin of the Bluetooth module detects a 4.3V voltage within 90 seconds, it will automatically power on when it is powered on.

[0004] The actual switching time of the existing Bluetooth module with automatic wake-up function is too long, which easily makes the user think that the device cannot be effectively shut down. Utility Model Content

[0005] The actual switching time of the existing Bluetooth module with automatic wake-up function is too long, which reduces the user experience.

[0006] In view of the above problems, a Bluetooth module control circuit that can quickly shut down is proposed. By setting a voltage stabilizing unit at the input end of the input detection module, the output end of the voltage stabilizing unit is electrically connected to the enable pin of the voltage conversion module. When the power switch is pressed, the voltage stabilizing unit can make the voltage input of the enable pin zero in a relatively short time, thereby greatly shortening the shutdown time and improving the user experience.

[0007] A Bluetooth module control circuit capable of rapid shutdown, comprising:

[0008] Bluetooth module;

[0009] Voltage conversion module;

[0010] Input detection module;

[0011] The input detection module is electrically connected to the voltage conversion module and the Bluetooth module respectively;

[0012] The voltage conversion module is also electrically connected to the Bluetooth module;

[0013] The input detection module includes a voltage stabilization unit;

[0014] The voltage conversion module includes a conversion chip;

[0015] The input end of the voltage conversion module is electrically connected to the input end of the input detection module, and the enable pin of the conversion chip is electrically connected to the output end of the voltage stabilizing unit:

[0016] When the power switch is pressed, the voltage output of the output end of the voltage stabilizing unit drops to zero within a specified time, thereby turning off the conversion chip to quickly shut down the device.

[0017] In conjunction with the Bluetooth module control circuit capable of rapid shutdown described in the utility model, in a first possible implementation manner, the voltage stabilizing unit is:

[0018] A first voltage zener diode;

[0019] The cathode of the first voltage stabilizing diode is electrically connected to the input end of the input detection module, and the anode of the first voltage stabilizing diode is electrically connected to the enable pin of the conversion chip.

[0020] In combination with the first possible implementation manner of the utility model, in a second possible implementation manner, the input detection module further includes:

[0021] a first capacitor;

[0022] A first resistor, a second resistor, a third resistor and a first transistor;

[0023] The anode of the first voltage stabilizing diode is electrically connected to the first end of the first resistor and the enable end of the conversion chip respectively;

[0024] The second end of the first resistor is electrically connected to the first end of the first capacitor, the first end of the second resistor, and the base of the first transistor;

[0025] The second end of the first capacitor, the second end of the second resistor, and the emitter of the first transistor are connected in common and then grounded;

[0026] The collector of the first transistor is electrically connected to the third resistor and the Bluetooth module.

[0027] In combination with the Bluetooth module control circuit capable of rapid shutdown described in the utility model, in a third possible implementation manner, the voltage conversion module further includes:

[0028] Input unit;

[0029] Switch control unit;

[0030] Output unit;

[0031] The input unit, the switch control unit, and the conversion chip are electrically connected to each other;

[0032] The conversion chip is also electrically connected to the output unit;

[0033] The output unit is also electrically connected to the Bluetooth module;

[0034] The switch control unit is also electrically connected to the Bluetooth module.

[0035] In combination with the third possible implementation manner of the utility model, in a fourth possible implementation manner, the switch control unit includes:

[0036] Switching circuit;

[0037] a first enabling control circuit;

[0038] a second enabling control circuit;

[0039] The first end of the switch circuit is electrically connected to the input pin of the conversion chip, and the second end is electrically connected to the Bluetooth module and the enable pin of the conversion chip;

[0040] A first end of the first enable control circuit is electrically connected to the output end of the voltage stabilizing unit, and a second end thereof is electrically connected to the enable pin of the conversion chip;

[0041] A first end of the second enable control circuit is electrically connected to the Bluetooth module, a second end is electrically connected to the enable pin of the conversion chip, and a third end is grounded.

[0042] In conjunction with the Bluetooth module control circuit capable of rapid shutdown described in the present utility model, in a fifth possible implementation manner, the Bluetooth module control circuit further includes:

[0043] Voltage input module;

[0044] The first end of the voltage input module is connected to the input socket, and the second end is connected to the voltage conversion module, the Bluetooth module and the input detection module.

[0045] In combination with the fifth possible implementation manner of the utility model, in a sixth possible implementation manner, the voltage input module includes:

[0046] A second capacitor and a third capacitor;

[0047] The first ends of the second capacitor and the third capacitor are electrically connected to the input socket, the voltage conversion module, the Bluetooth module and the input detection module respectively, and the second ends thereof are grounded.

[0048] In combination with the fourth possible implementation manner of the utility model, in a seventh possible implementation manner, the switch circuit includes a switch button and a second voltage stabilizing diode;

[0049] The first end of the switch button is electrically connected to the input pin of the conversion chip, the second end is electrically connected to the anode of the second voltage regulator diode and the Bluetooth module chip, and the cathode of the second voltage regulator diode is electrically connected to the enable pin of the conversion chip.

[0050] In combination with the fourth possible implementation manner of the utility model, in an eighth possible implementation manner, the first enable control circuit includes: a third voltage zener diode and a sixth resistor; the anode of the third voltage zener diode is electrically connected to the anode of the first voltage zener diode, the cathode is electrically connected to the first end of the sixth resistor, and the second end of the sixth resistor is electrically connected to the enable pin of the conversion chip.

[0051] In combination with the fourth possible implementation manner of the utility model, in a ninth possible implementation manner, the second enable control circuit includes: a fourth voltage zener diode, a fourth capacitor and a seventh resistor; the anode of the fourth voltage zener diode is electrically connected to the Bluetooth module chip, the cathode is electrically connected to the first end of the seventh resistor, the first end of the fourth capacitor, and the enable pin of the conversion chip, and the second end of the seventh resistor and the second end of the fourth capacitor are grounded.

[0052] The utility model is implemented as a Bluetooth module control circuit that can quickly shut down. By setting a voltage stabilizing unit at the input end of the input detection module, the output end of the voltage stabilizing unit is electrically connected to the enable pin of the voltage conversion module. When the power switch is pressed, the voltage stabilizing unit can make the voltage input of the enable pin zero in a relatively short time, thereby greatly shortening the shutdown time and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 This is a schematic diagram of module connection of a Bluetooth module control circuit capable of rapid shutdown in the present invention;

[0055] Figure 2This is a schematic diagram of the circuit structure of an input detection module in a Bluetooth module control circuit capable of rapid shutdown in the utility model;

[0056] Figure 3 This is a schematic diagram of the circuit structure of a voltage conversion module in a Bluetooth module control circuit capable of rapid shutdown in the utility model;

[0057] Figure 4 It is a schematic diagram of the circuit structure of a Bluetooth module in a Bluetooth module control circuit capable of rapid shutdown in the utility model;

[0058] Figure 5 The schematic diagram is a circuit structure diagram of an input voltage module in a Bluetooth module control circuit capable of rapid shutdown in the utility model. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0061] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0062] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] The actual switching time of the existing Bluetooth module with automatic wake-up function is too long, which reduces the user experience.

[0065] In view of the above problems, a Bluetooth module control circuit capable of rapid shutdown is proposed.

[0066] like Figure 1 , Figure 1 The present invention is a schematic diagram of the module connection of the Bluetooth module control circuit that can be quickly shut down in the present invention; a Bluetooth module control circuit that can be quickly shut down includes a Bluetooth module, a voltage conversion module, and an input detection module; the input detection module is electrically connected to the voltage conversion module and the Bluetooth module respectively; the voltage conversion module is also electrically connected to the Bluetooth module; the input detection module includes a voltage stabilizing unit; the voltage conversion module includes a conversion chip; the input end of the voltage conversion module is electrically connected to the input end of the input detection module, and the enable pin of the conversion chip is electrically connected to the output end of the voltage stabilizing unit: when the power switch is pressed, the output end of the voltage stabilizing unit drops to zero voltage output within a specified time, thereby turning off the conversion chip to quickly shut down. By setting a voltage stabilizing unit at the input end of the input detection module, so that the output end of the voltage stabilizing unit is electrically connected to the enable pin of the voltage conversion module, when the power switch is pressed, the voltage stabilizing unit can make the voltage input of the enable pin zero in a relatively short time, which greatly shortens the shutdown time and improves the user experience.

[0067] Preferably, if Figure 2 , Figure 2 This is a schematic diagram of the circuit structure of the input detection module in the Bluetooth module control circuit that can quickly shut down in the utility model. The voltage stabilizing unit is: a first voltage stabilizing diode; the cathode of the first voltage stabilizing diode is electrically connected to the input end of the input detection module, and the anode is electrically connected to the enable pin of the conversion chip.

[0068] In this embodiment, when the device is turned off, the anode voltage of the first voltage stabilizing diode D1 drops rapidly to zero in about 1.5 seconds, so that the conversion chip stops working and no longer outputs voltage, and the Bluetooth module no longer wakes up and turns on again.

[0069] Specifically, Figure 2The input detection module also includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a first transistor Q1; the anode of the first voltage stabilizing diode D1 is electrically connected to the first end of the first resistor R1 and the enable end of the conversion chip respectively; the second end of the first resistor R1 is electrically connected to the first end of the first capacitor C1, the first end of the second resistor R2, and the base of the first transistor Q1; the second end of the first capacitor C1, the second end of the second resistor R2, and the emitter of the first transistor Q1 are connected in common and then grounded; the collector of the first transistor Q1 is electrically connected to the third resistor R3 and the Bluetooth module.

[0070] like Figure 2 In the circuit structure, D1 is an 18V voltage-stabilizing diode. When the input voltage reaches 18V, the pn junction of D5 reversely breaks down. The current changes in a wide range while the voltage remains basically unchanged, which plays a role in voltage stabilization. The anode voltage of D1 is equal to 24V-18V=6V. C1 is a high-frequency filter capacitor, R1 and R2 are base bias resistors of transistor Q1, and R3 is the collector bias resistor of transistor Q1. Transistor Q1 has a current amplification function. When the AC line is plugged in, the switching power supply outputs a DC24V voltage. After D1 reversely breaks down and stabilizes the voltage, the anode of D1 has a 6V voltage that passes through R1. R2 divides the voltage and outputs a 1.36V voltage that is sent to the base electrode of transistor Q1. The Vbe of transistor Q1 is ≥0.7V. Transistor Q1 is turned on, and the collector voltage is pulled down to the ground. The DC_DET network is connected to the collector of Q1 and is fed back to the 36th pin of the Bluetooth module at a low level. After the 36th pin of the Bluetooth module receives a low level, the 5th and 6th pins of the Bluetooth module output the I2C communication protocol to charge the battery charging management chip and the battery. Conversely, when the DC24V input voltage drops from 24V to below 18V after the AC line is unplugged, the D1 voltage regulator tube will not reversely break down, and there will be no voltage output to R1 and R2 voltage divider. The base electrode voltage of the transistor Q1 is zero, the transistor Q1 is cut off, and DC_DET is high level and fed back to the 36th pin of the Bluetooth module. After the 36th pin of the Bluetooth module receives a high level, the 5th and 6th pins of the Bluetooth module output the I2C communication protocol, and the battery charging management chip stops charging the battery.

[0071] In this embodiment, when the DC24V drops from 24V to 18V at the moment when the AC line is unplugged, the voltage regulator tube D1 reversely breaks down, and the reverse breakdown current flowing through the voltage regulator tube changes greatly, but the voltage at both ends of the tube remains almost unchanged. However, after 1.5 seconds, the 24V voltage quickly drops below the 18V voltage. At this time, the voltage regulator tube D5 does not reversely break down, and there is no voltage on the anode of D1, so the conversion chip has no voltage output. This embodiment can quickly turn off the enable pin of the conversion chip within 1.5 seconds after the AC line is unplugged and the power is cut off, thereby disconnecting the 5V voltage output of the voltage conversion module.

[0072] Furthermore, the voltage conversion module also includes an input unit 310, a switch control unit 320, and an output unit 330; the input unit 310, the switch control unit 320, and the conversion chip U1 are electrically connected to each other; the conversion chip U1 is also electrically connected to the output unit 330; the output unit 330 is also electrically connected to the Bluetooth module; the switch control unit 320 is also electrically connected to the Bluetooth module.

[0073] Specifically, Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the voltage conversion module in the Bluetooth module control circuit that can be quickly shut down in the utility model. The switch control unit 320 includes a switch circuit 321, a first enable control circuit 322, and a second enable control circuit 323; the first end of the switch circuit 321 is electrically connected to the input pin (IN) of the conversion chip U1, and the second end (ON / OFF) is electrically connected to the enable pin (EN) of the Bluetooth module chip U2 and the conversion chip U1; the first end (DC_EN) of the first enable control circuit 322 is electrically connected to the output end (DC_EN) of the voltage stabilizing unit, and the second end is electrically connected to the enable pin (EN) of the conversion chip U1; the first end (POWER_EN) of the second enable control circuit 323 is electrically connected to the Bluetooth module chip U2, the second end is electrically connected to the enable pin (EN) of the conversion chip, and the third end is grounded (GND).

[0074] The output unit is electrically connected to the 27th pin (SYS_5V) of the Bluetooth module chip (U2) through a voltage regulator tube.

[0075] The switch circuit 321 includes: a switch button K1 and a second voltage-stabilizing diode D2; the first end of the switch button K1 is electrically connected to the input pin (IN) of the conversion chip U1, the second end (ON / OFF) is electrically connected to the anode of the second voltage-stabilizing diode D2 and the Bluetooth module 100 chip U2, and the cathode of the second voltage-stabilizing diode D2 is electrically connected to the enable pin (EN) of the conversion chip U1.

[0076] The first enable control circuit 322 includes: a third zener diode D3 and a sixth resistor R6; the anode of the third zener diode D3 is electrically connected to the anode of the first zener diode D1, the cathode is electrically connected to the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is electrically connected to the enable pin (EN) of the conversion chip U1.

[0077] When shutting down, the first enabling control circuit can make the voltage input of the enable pin (EN) of the conversion chip U2 zero in a very short time, so that no voltage is output, and the shutdown is realized quickly.

[0078] The second enable control circuit 323 includes: a fourth voltage-stabilizing diode D4, a fourth capacitor C4 and a seventh resistor R7; the anode of the fourth voltage-stabilizing diode D4 is electrically connected to the (POWER_EN) pin of the Bluetooth module 100 chip U2, the cathode is electrically connected to the first end of the seventh resistor R7, the first end of the fourth capacitor C4, and the enable pin (EN) of the conversion chip U1, and the second end of the seventh resistor R7 and the second end of the fourth capacitor C4 are grounded.

[0079] Shutdown principle: When shutting down, Figure 3 and Figure 4 , Figure 4 This is a schematic diagram of the circuit structure of the Bluetooth module in the Bluetooth module control circuit that can quickly shut down the utility model. When the K1 switch button is pressed, a voltage comes from the ON / OFF network and then outputs a 2.9V bias voltage through the voltage divider composed of resistors R4 and R5 in the Bluetooth module to the base of the transistor Q2. Q2 is turned on and the collector is grounded. The ONOFF pin of the Bluetooth module is grounded and at a low level, and it automatically shuts down after a period of time.

[0080] Furthermore, the Bluetooth module control circuit also includes: a voltage input module; a first end of the voltage input module is connected to the input socket, and a second end of the voltage input module is connected to the voltage conversion module, the Bluetooth module and the input detection module.

[0081] Specifically, Figure 5 , Figure 5 This is a schematic diagram of the circuit structure of the input voltage module in the Bluetooth module control circuit that can quickly shut down in the utility model. The voltage input module includes a second capacitor C2 and a third capacitor C3; the first ends of the second capacitor C2 and the third capacitor C3 are respectively electrically connected to the input socket (CON8), the voltage conversion module, the Bluetooth module and the input detection module, and the second ends are grounded.

[0082] A Bluetooth module control circuit that can quickly shut down the utility model is implemented. By setting a voltage stabilizing unit at the input end of the input detection module, the output end of the voltage stabilizing unit is electrically connected to the enable pin of the voltage conversion module. When the power switch is pressed, the voltage stabilizing unit can make the voltage input of the enable pin zero in a relatively short time, thereby greatly shortening the shutdown time and improving the user experience.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A Bluetooth module control circuit capable of rapid shutdown, characterized in that: include: Bluetooth module; Voltage conversion module; Input detection module; The input detection module is electrically connected to the voltage conversion module and the Bluetooth module respectively; The voltage conversion module is also electrically connected to the Bluetooth module; The input detection module includes a voltage stabilization unit; The voltage conversion module includes a conversion chip; The input end of the voltage conversion module is electrically connected to the input end of the input detection module, and the enable pin of the conversion chip is electrically connected to the output end of the voltage stabilizing unit: When the power switch is pressed, the voltage output of the output end of the voltage stabilizing unit drops to zero within a specified time, thereby turning off the conversion chip to quickly shut down the device.

2. The Bluetooth module control circuit capable of rapid shutdown according to claim 1, characterized in that: The voltage stabilizing unit is: A first voltage zener diode; The cathode of the first voltage stabilizing diode is electrically connected to the input end of the input detection module, and the anode of the first voltage stabilizing diode is electrically connected to the enable pin of the conversion chip.

3. The Bluetooth module control circuit capable of rapid shutdown according to claim 2, characterized in that: The input detection module also includes: a first capacitor; A first resistor, a second resistor, a third resistor and a first transistor; The anode of the first voltage stabilizing diode is electrically connected to the first end of the first resistor and the enable end of the conversion chip respectively; The second end of the first resistor is electrically connected to the first end of the first capacitor, the first end of the second resistor, and the base of the first transistor; The second end of the first capacitor, the second end of the second resistor, and the emitter of the first transistor are connected in common and then grounded; The collector of the first transistor is electrically connected to the third resistor and the Bluetooth module.

4. The Bluetooth module control circuit capable of rapid shutdown according to claim 2, characterized in that: The voltage conversion module also includes: Input unit; Switch control unit; Output unit; The input unit, the switch control unit, and the conversion chip are electrically connected to each other; The conversion chip is also electrically connected to the output unit; The output unit is also electrically connected to the Bluetooth module; The switch control unit is also electrically connected to the Bluetooth module.

5. The Bluetooth module control circuit capable of rapid shutdown according to claim 4, characterized in that: The switch control unit comprises: Switching circuit; a first enabling control circuit; a second enabling control circuit; The first end of the switch circuit is electrically connected to the input pin of the conversion chip, and the second end is electrically connected to the Bluetooth module and the enable pin of the conversion chip; A first end of the first enable control circuit is electrically connected to the output end of the voltage stabilizing unit, and a second end thereof is electrically connected to the enable pin of the conversion chip; A first end of the second enable control circuit is electrically connected to the Bluetooth module, a second end is electrically connected to the enable pin of the conversion chip, and a third end is grounded.

6. The Bluetooth module control circuit capable of rapid shutdown according to claim 1, characterized in that: The bluetooth module control circuit also includes: Voltage input module; The first end of the voltage input module is connected to the input socket, and the second end is connected to the voltage conversion module, the Bluetooth module and the input detection module.

7. The Bluetooth module control circuit capable of rapid shutdown according to claim 6, characterized in that: The voltage input module comprises: A second capacitor and a third capacitor; The first ends of the second capacitor and the third capacitor are electrically connected to the input socket, the voltage conversion module, the Bluetooth module and the input detection module respectively, and the second ends thereof are grounded.

8. The Bluetooth module control circuit capable of rapid shutdown according to claim 5, characterized in that: The switch circuit includes a switch button and a second voltage stabilizing diode; The first end of the switch button is electrically connected to the input pin of the conversion chip, the second end is electrically connected to the anode of the second voltage regulator diode and the Bluetooth module chip, and the cathode of the second voltage regulator diode is electrically connected to the enable pin of the conversion chip.

9. The Bluetooth module control circuit capable of rapid shutdown according to claim 5, characterized in that: The first enable control circuit includes: a third voltage regulator diode and a sixth resistor; the anode of the third voltage regulator diode is electrically connected to the anode of the first voltage regulator diode, the cathode is electrically connected to the first end of the sixth resistor, and the second end of the sixth resistor is electrically connected to the enable pin of the conversion chip.

10. The Bluetooth module control circuit capable of rapid shutdown according to claim 5, characterized in that: The second enabling control circuit includes: a fourth voltage-stabilizing diode, a fourth capacitor and a seventh resistor; the anode of the fourth voltage-stabilizing diode is electrically connected to the Bluetooth module chip, the cathode is electrically connected to the first end of the seventh resistor, the first end of the fourth capacitor, and the enable pin of the conversion chip, and the second end of the seventh resistor and the second end of the fourth capacitor are grounded.

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