Bluetooth flashlight control circuit

Abstract

The utility model relates to the technical field of Bluetooth flashlight circuits, and discloses a Bluetooth flashlight control circuit with Bluetooth dimming and LED current sharing, which is provided with a main control module used for receiving a voltage signal input by a battery module and performing boost / buck processing on the voltage signal; the power supply end of the dimming module is connected with one output end of the main control module and used for receiving the voltage signal, and the PWM pulse signal output end of the dimming module is connected with one signal input end of the main control module and used for receiving the PWM pulse signal; the transmitting end / receiving end of the Bluetooth module is respectively connected with the receiving end / transmitting end of the dimming module, and the Bluetooth module is used for establishing wireless communication connection and inputting a dimming instruction to the dimming module; when the main control module controls the LED module to work, the dimming module outputs a PWM pulse signal according to the dimming instruction, and the light emitting mode of the LED module is regulated and controlled through the PWM pulse signal.

Description

Technical Field

[0001] The utility model relates to the technical field of Bluetooth flashlight circuits, and more specifically to a Bluetooth flashlight control circuit. Background Art

[0002] Flashlights are common lighting tools in daily life. As they are rarely used, they are often left alone. However, they are difficult to find when needed. In addition, existing high-power flashlights basically use step-down circuits. The step-down IC has a constant current function inside, which can achieve a constant current output.

[0003] However, in high-power applications, since the battery voltage is basically fixed, the voltage output to the LED must be lower than the battery voltage to achieve the buck circuit function. In this way, the lamp beads can only be connected in parallel to achieve high power. Since the current flowing through each lamp bead connected in parallel is different, it is easy to shorten the life. Utility Model Content

[0004] The technical problem to be solved by the present invention is that, in view of the above-mentioned prior art, it can effectively solve the defect that the life of the lamp beads connected in parallel is easily shortened due to the different currents flowing through each lamp bead connected in parallel, and provide a Bluetooth flashlight control circuit with Bluetooth dimming and LED current equalization.

[0005] The technical solution adopted by the utility model to solve the technical problem is to construct a Bluetooth flashlight control circuit, which has:

[0006] A main control module is configured in the control circuit, and is used to receive a voltage signal input from the battery module and perform voltage step-up / step-down processing on the voltage signal;

[0007] A dimming module, whose power supply end is connected to an output end of the main control module, is used to receive the voltage signal.

[0008] The PWM pulse signal output terminal of the dimming module is connected to a signal input terminal of the main control module for receiving the PWM pulse signal;

[0009] A Bluetooth module, whose transmitting end / receiving end is respectively connected to the receiving end / transmitting end of the dimming module, for establishing a wireless communication connection and inputting a dimming instruction to the dimming module;

[0010] When the main control module controls the LED module to work, the dimming module outputs the PWM pulse signal according to the dimming instruction, and adjusts the light-emitting mode of the LED module through the PWM pulse signal.

[0011] In some implementations, the dimming module adjusts the duty cycle of the output PWM pulse signal according to the dimming instruction.

[0012] In some embodiments, the dimming module includes at least a dimming controller.

[0013] The power supply end of the dimming controller is connected to an output end of the main control module.

[0014] The PWM pulse signal output terminal of the dimming controller is connected to a signal input terminal of the main control module.

[0015] The transmitting end / receiving end of the dimming controller is connected to the receiving end / transmitting end of the Bluetooth module respectively.

[0016] In some embodiments, the main control module includes at least a boost converter and an operational amplifier.

[0017] The power input terminal of the boost converter is connected to the input terminal of the battery module, and is used to receive the voltage signal and perform boost processing on the voltage signal.

[0018] The output end of the boost converter is connected to the positive electrode of the LED module, and the boosted voltage signal is used to trigger the LED module.

[0019] The in-phase terminal of the operational amplifier is connected to the cathode of the LED module.

[0020] The inverting terminal of the operational amplifier is connected to the PWM pulse signal output terminal of the dimming controller.

[0021] The output terminal of the operational amplifier is coupled to the feedback terminal of the boost converter.

[0022] In some embodiments, the main control module further includes a voltage stabilizer.

[0023] The input terminal of the voltage regulator is connected to an output terminal of the battery module.

[0024] An output terminal of the voltage stabilizer is connected to a power input terminal of the dimming controller.

[0025] In some embodiments, the dimming module further includes a switch branch.

[0026] A signal end of the switch branch is connected to a signal input end of the dimming controller.

[0027] The other signal end of the switch branch is connected to the common end.

[0028] In some embodiments, an undervoltage lockout protection module is also included.

[0029] One end of the undervoltage lockout protection module is connected to an output end of the battery module,

[0030] The other end of the undervoltage lockout protection module is connected to the undervoltage feedback end of the dimming controller.

[0031] In some embodiments, an over-temperature protection module is further included, the detection side of which is configured on the surface of the battery module and is used to obtain a temperature signal of the battery module.

[0032] One end of the over-temperature protection module is connected to an output end of the main control module.

[0033] The other end of the over-temperature protection module is connected to the temperature feedback end of the dimming controller.

[0034] The Bluetooth flashlight control circuit described in the utility model includes a main control module, a dimming module and a Bluetooth module for receiving a voltage signal input from a battery module and performing voltage step-up / step-down processing on the voltage signal. When the main control module controls the LED module to work, the dimming module outputs a PWM pulse signal according to the dimming instruction, and the light-emitting mode of the LED module is regulated by the PWM pulse signal. Compared with the prior art, the dimming module is connected to the Bluetooth module through communication, and the Bluetooth control can be used to make the flashlight emit a sound, which is convenient for finding and using the Bluetooth control to wirelessly switch the flashlight on and off and dim the light. When the voltage of the battery module is the same, a series connection method can be used to achieve high power, so that the current can flow evenly through each lamp bead, thereby increasing the service life of the LED module, and effectively solving the problem that the current flowing through each lamp bead connected in parallel is different, which easily causes a shortened life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1a This is a circuit schematic diagram of an embodiment of a main control module provided by the utility model;

[0037] Figure 1b This is a circuit schematic diagram of an embodiment of a dimming module and a Bluetooth module provided by the utility model;

[0038] Figure 1c It is a circuit schematic diagram of an embodiment of an undervoltage lockout protection module and an overtemperature protection module provided by the utility model. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0040] like Figure 1a-Figure 1cAs shown, in the first embodiment of the Bluetooth flashlight control circuit of the present utility model, the Bluetooth flashlight control circuit includes a main control module 10a, a dimming module 10b, a Bluetooth module 10c, an undervoltage lockout protection module 10d and an overtemperature protection module 10e.

[0041] The main control module 10a has the functions of signal detection, comparison, current signal adjustment, voltage boost, voltage reduction and switch, and is used to receive the voltage signal input from the battery module (BAT1-BAT6), and after processing the input voltage signal, output a voltage signal for controlling the switch state of the LED module (LED1-LED6); the other voltage signal provides the dimming module 10b with a driving voltage (corresponding to VDD) and a reference voltage (corresponding to 2.5V);

[0042] The dimming module 10b is used for calculating, processing and outputting the enable signal and the PWM pulse signal.

[0043] The dimming module 10b is provided with a voltage preset value (such as 7.5V) and a temperature preset value (such as 60°C);

[0044] The Bluetooth module 10c is used to establish a wireless communication connection with the dimming module 10b, and is used to input a switch signal or a dimming instruction to the dimming module 10b;

[0045] The undervoltage lockout protection module 10d is used to detect the voltage signal of the battery module (BAT1-BAT6), and after dividing the voltage signal, output it to the dimming module 10b, which compares the feedback voltage signal with the voltage preset value, and controls the level state of the output enable signal according to the comparison result;

[0046] The over-temperature protection module 10e is used to obtain the temperature signal of the surface of the battery module (BAT1-BAT6) when it is working, and feed the temperature signal back to the output dimming module 10b, which compares the fed-back temperature signal with the temperature preset value, and controls the level state of the output enable signal according to the comparison result;

[0047] Specifically, the main control module 10a is configured in the control circuit, and is used to receive the voltage signal input by the battery module (BAT1-BAT6), and perform voltage step-up / step-down processing on the voltage signal. The stepped-up voltage signal (corresponding to 7.5V-12.6V) is used to control the switch state of the LED module (LED1-LED6);

[0048] The stepped-down voltage signal is used as a driving power signal and a reference signal of the dimming module 10b;

[0049] Furthermore, the power supply terminal (corresponding to VDD) of the dimming module 10b is connected to an output terminal (corresponding to VDD) of the main control module 10a, and is used to receive a voltage signal (corresponding to 3.3V), and the voltage signal (corresponding to 3.3V) is used to trigger the dimming module 10b to work;

[0050] The PWM pulse signal output terminal (corresponding to pin 13) of the dimming module 10b is connected to a signal input terminal (corresponding to PWM1) of the main control module 10a, and is used to receive the PWM pulse signal input by the dimming module 10b. After being processed by the main control module 10a, the PWM pulse signal is used to adjust the light emitting state of the LED module (LED1-LED6) (such as low, medium, high and flashing);

[0051] Furthermore, the transmitting end (corresponding to TXD) of the Bluetooth module 10c is connected to the receiving end (corresponding to RXD) of the dimming module 10b.

[0052] The receiving end (corresponding to RXD) of the Bluetooth module 10c is connected to the transmitting end (corresponding to TXD) of the dimming module 10b for direct connection or establishment of a wireless communication connection, and data transmission is performed through the receiving / transmitting end to input dimming instructions (such as low, medium, high and flash) to the dimming module 10b;

[0053] When the enable signal output by the dimming module 10b is at a high level, the main control module 10a is controlled to be turned on, thereby boosting the input voltage signal (corresponding to 7.5V-12.6V) and outputting it to the positive electrode of the LED module (LED1-LED6), thereby controlling the operation of the LED module (LED1-LED6);

[0054] When the LED modules (LED1-LED6) are in operation, a dimming instruction can be input through the dimming module 10b, and the dimming module 10b outputs a PWM pulse signal according to the input dimming instruction;

[0055] The dimming module 10b can also adjust the duty cycle of the output PWM pulse signal according to the input dimming command, thereby adjusting the brightness state of the LED module (LED1-LED6);

[0056] Furthermore, after being processed by the main control module 10a, the input PWM pulse signal is used to adjust the light emission mode (such as low, medium, high and flashing) of the LED module to achieve wireless control dimming or direct dimming.

[0057] By using the technical solution, a communication connection is established between the dimming module 10b and the Bluetooth module 10c, so that remote control can be achieved, and the flashlight can be made to emit a sound by using Bluetooth control, so as to facilitate searching; and

[0058] Use Bluetooth control to wirelessly switch on and off the flashlight and dim it;

[0059] In addition, when the voltage of the battery modules (BAT1-BAT6) is the same, a series connection can be used to achieve high power, so that the current can flow evenly through each lamp bead, thereby increasing the service life of the LED module. This can effectively solve the problem of shortening the life of the LED module due to different currents flowing through each lamp bead connected in parallel.

[0060] In some embodiments, in order to improve the performance of the control circuit, such as Figure 1b As shown, a dimming controller MCU1 can be set in the dimming module 10b, which has preset values ​​(such as voltage and temperature) and has the functions of receiving signals, outputting PWM pulse signals, adjusting the duty cycle of PWM pulse signals and outputting enable signals.

[0061] Specifically, the power supply terminal (corresponding to pin 24) of the dimming controller MCU1 is connected to an output terminal (corresponding to the VDD terminal) of the main control module 10a to receive a voltage signal (corresponding to 3.3V).

[0062] The PWM pulse signal output terminal (corresponding to pin 13) of the dimming controller MCU1 is connected to a signal input terminal (corresponding to terminal PWM1) of the main control module 10a to receive the PWM pulse signal;

[0063] The transmitting end (corresponding to TXD) of the dimming controller MCU1 is connected to the receiving end (corresponding to RXD) of the Bluetooth module 10c.

[0064] The receiving end (corresponding to RXD) of the Bluetooth module 10c is connected to the transmitting end (corresponding to TXD) of the dimming module 10b for direct connection or establishing a wireless communication connection, and data is transmitted through the receiving / transmitting end to input dimming instructions (such as low, medium, high and flash) to the dimming module 10b.

[0065] Specifically, the model of the Bluetooth module 10c may be HC05, which can be directly connected to the port of the dimming module 10b, and through RXD and TXD communication, the dimming module 10b can also achieve the dimming function equivalent to button control, and the addition of a buzzer circuit can be used as a sound prompt function;

[0066] The buzzer circuit is connected to the 23rd pin of the dimming module 10b, and the Bluetooth module 10c sends a signal to the dimming module 10b to control the buzzer action. In addition, the buzzer can also be used as a low voltage reminder of the battery module (BAT1-BAT6);

[0067] The above wireless control functions can all be controlled from a mobile terminal, that is, the mobile terminal can be connected to the Bluetooth module 10c to make the flashlight emit a sound to achieve the function of finding the flashlight, and the mobile terminal can also be connected to the Bluetooth module 10c to start / stop the flashlight to achieve the function of adjusting the brightness.

[0068] In some embodiments, Figure 1a As shown, in order to improve the switching and brightness adjustment effect of the LED module (LED1-LED6), a boost converter U1 and an operational amplifier U4 can be set in the main control module 10a, wherein the boost converter U1 has the functions of boosting, feedback voltage signal and PWM pulse signal processing, and its maximum input voltage is 12.6V, the minimum output voltage is 18V, and it has a fixed frequency of 600kHz and a wide input range;

[0069] The operational amplifier U4 has the function of signal amplification.

[0070] Specifically, the power input terminal (corresponding to pin 12) of the boost converter U1 is connected to the input terminal (corresponding to Vdd2 terminal) of the battery module (BAT1-BAT6) to receive a voltage signal (corresponding to 7.5V-12.6V) and perform a boost process on the voltage signal (corresponding to 7.5V-12.6V). The lowest output voltage signal is 18V.

[0071] The enable terminal (corresponding to pin 11) of the boost converter U1 is connected to the enable signal output terminal (corresponding to pin 18) of the dimming controller MCU1, which is used to receive the enable signal input by the dimming controller MCU1.

[0072] When the input enable signal is at a high level, the boost converter U1 is controlled to work and boost the input voltage signal (corresponding to 7.5V-12.6V).

[0073] Furthermore, the output end (corresponding to pin 8) of the boost converter U1 is connected to the positive electrode of the LED module (LED1-LED6), and the boosted voltage signal is used to trigger the LED module (LED1-LED6), thereby lighting up the LED module (LED1-LED6);

[0074] Furthermore, the in-phase terminal (corresponding to pin 1) of the operational amplifier U4 is connected to the negative electrode of the LED module (LED1-LED6).

[0075] The inverting terminal of the operational amplifier U4 (corresponding to pin 3) is connected to the PWM pulse signal output terminal of the dimming controller MCU1 (corresponding to pin 13).

[0076] The output terminal (corresponding to pin 4) of the operational amplifier U4 is coupled to the feedback terminal (corresponding to pin 5) of the boost converter U1;

[0077] Specifically, the operational amplifier U4 is used to receive the PWM pulse signal input by the dimming controller MCU1. After being amplified by the operational amplifier U4, the PWM pulse signal is input to the boost converter U1, which outputs a control signal for controlling the brightness state of the LED module (LED1-LED6).

[0078] Specifically, the seventh capacitor C7 and the tenth capacitor C10 are arranged at the power input end (corresponding to pin 12) of the boost converter U1 as input filter capacitors, and the fourteenth capacitor C14 and the thirtieth capacitor C30 are arranged at the output end (corresponding to pin 8) of the boost converter U1 as output filter capacitors.

[0079] The twentieth capacitor C20 is a soft-start capacitor, and the twenty-second capacitor C22, the twenty-fourth capacitor C24 and the eleventh resistor R11 form a second-order compensation;

[0080] The twenty-seventh capacitor C27 is a storage capacitor of VCC inside the boost converter U1, and the twenty-ninth capacitor C29 and the resistor RA1 provide a bootstrap capacitor for the high-side MOS of the boost converter U1;

[0081] The third resistor R3 and the twenty-second resistor R22 are arranged at the output end (corresponding to pin 8) of the boost converter U1, and are output voltage detection resistors. In order to achieve output voltage stabilization, the LED module (LED1-LED6) requires a constant current to emit light stably. In addition, the constant current circuit can change the current flowing through the LED module (LED1-LED6) to achieve the dimming function.

[0082] In some embodiments, Figure 1b As shown, the main control module 10a also includes a voltage stabilizer U3, which has a voltage stabilization function.

[0083] Specifically, the input end (corresponding to the Vin end) of the voltage regulator U3 is connected to an output end of the battery module (BAT1-BAT6) through a thirty-first resistor R31, for receiving a voltage signal;

[0084] An output terminal of the voltage regulator U3 (corresponding to the VDD terminal) is connected to the power input terminal of the dimming controller MCU1 (corresponding to the 24th pin) to provide a 3.3V voltage signal to it;

[0085] Among them, the thirteenth capacitor C13 and the fourth capacitor C4 are filter capacitors of the voltage regulator U3. In addition, there is a 2.5V reference voltage for the dimming controller MCU1 as a reference. The reference voltage circuit composed of the thyristor U2, the thirty-second resistor R32, and the sixth capacitor C6 outputs a 2.5V reference voltage at its output end;

[0086] Specifically, an output end of the voltage regulator U3 (corresponding to the VDD end) is connected to one end of the thirty-second resistor R32, an output end of the voltage regulator U3 (corresponding to the VDD end) is connected to the anode of the thyristor U2 through the sixth capacitor C6, the other end of the thirty-second resistor R32 is connected to the cathode of the thyristor U2, and the control electrode of the thyristor U2 is connected to the reference signal end (corresponding to pin 21) of the dimming controller MCU1.

[0087] In some embodiments, Figure 1b As shown, the dimming module 10b further includes a switch branch, wherein a signal end of the switch branch is connected to a signal input end (corresponding to pin 2) of the dimming controller MCU1.

[0088] The other signal end of the switch branch is connected to the common end.

[0089] Specifically, the switch branch includes a touch switch S1, wherein one end of the touch switch S1 (corresponding to pin 2) is connected to a signal input end (corresponding to pin 2) of the dimming controller MCU1 through a diode D1, and the other end of the touch switch S1 (corresponding to pin 1) is connected to the common end.

[0090] In some embodiments, Figure 1c As shown, it also includes an undervoltage lockout protection module 10d, wherein:

[0091] One end (corresponding to the Vdd2 end) of the undervoltage lockout protection module 10d is connected to an output end (corresponding to the Vdd2 end) of the battery module (BAT1-BAT6) to obtain the voltage signal of the battery module (BAT1-BAT6).

[0092] The other end of the undervoltage lockout protection module 10d (corresponding to the Vin detect end) is connected to the undervoltage feedback end (corresponding to pin 20) of the dimming controller MCU1, and the acquired voltage signal is fed back to the dimming controller MCU1. The dimming controller MCU1 compares the feedback voltage signal with the preset voltage value (such as 7.5V). When the voltage signal is less than the preset voltage value (such as 7.5V), the enable signal end (corresponding to pin 18) of the dimming controller MCU1 outputs a low level, and the boost converter U1 is controlled to be turned off, and no boost signal is output.

[0093] Specifically, the undervoltage lockout protection module 10d includes an eighteenth resistor R18, a nineteenth resistor R19 and a twenty-fourth resistor R24, wherein one end of the nineteenth resistor R19 is connected to an output end (corresponding to the Vdd2 end) of the battery module (BAT1-BAT6),

[0094] The other end of the nineteenth resistor R19 is connected to one end of the eighteenth resistor R18 and the twenty-fourth resistor R24 ​​respectively, and the other end of the eighteenth resistor R18 is connected to the undervoltage feedback end (corresponding to pin 20) of the dimming controller MCU1. The acquired voltage signal is fed back to the dimming controller MCU1 through the nineteenth resistor R19 and the eighteenth resistor R18.

[0095] In some embodiments, Figure 1c As shown, it also includes an over-temperature protection module 10e, whose detection side is configured on the surface of the battery module (BAT1-BAT6) for obtaining the temperature signal of the battery module (BAT1-BAT6).

[0096] One end of the over-temperature protection module 10e (corresponding to 2.5V) is connected to an output end of the main control module 10a. Specifically, one end of the over-temperature protection module 10e (corresponding to 2.5V) is connected to the control electrode of the thyristor U2.

[0097] The other end of the over-temperature protection module 10e (corresponding to the NTC AD end) is connected to the temperature feedback end (corresponding to pin 17) of the dimming controller MCU1, and the acquired temperature signal is fed back to the dimming controller MCU1, which compares the temperature signal with the temperature preset value, and then controls the level state of the output enable signal according to the comparison result.

[0098] Specifically, the over-temperature protection module 10e includes a fourteenth resistor R14, a twentieth resistor R20, an eighth capacitor C8 and a thermistor NTC1, wherein one end of the twentieth resistor R20 is connected to the control electrode of the thyristor U2, the other end of the twentieth resistor R20 is respectively connected to the fourteenth resistor R14 and one end of the thermistor NTC1, the other end of the fourteenth resistor R14 is connected to one end of the eighth capacitor C8 and the temperature feedback end (corresponding to pin 17) of the dimming controller MCU1, and the other ends of the thermistor NTC1 and the eighth capacitor C8 are connected to the common end;

[0099] That is, the temperature signal obtained by the temperature-sensitive resistor NTC1 is input into the temperature feedback terminal (corresponding to the 17th pin) of the dimming controller MCU1 via the fourteenth resistor R14.

[0100] Specifically, when the main control module 10a stops operating, the LED module (LED1-LED6) does not emit light, and the dimming controller MCU1 outputs a PWM pulse signal to the inverting end (corresponding to pin 3) of the operational amplifier U4, and its in-phase end (corresponding to pin 1) is the current signal when the LED module (LED1-LED6) is working. The series current passes through the sixteenth resistor R16 to generate a voltage to the in-phase end (corresponding to pin 1) of the operational amplifier U4, and the PWM pulse signal passes through the thirteenth resistor R13, the twelfth resistor R12, the seventeenth resistor R17, the twenty-sixth capacitor C26, and the twenty-fifth capacitor C25 to form a low-pass filter to become a stable DC reference voltage. The input pin of the operational amplifier U4 has an input potential, the fifteenth resistor R15 and the twenty-eighth capacitor C28 are negative feedback compensation parts, and the output end (corresponding to pin 4) is connected to the feedback end (corresponding to pin 5) of the boost converter U1 through the ninth resistor R9 and the second diode D2 to achieve a constant current function;

[0101] When the touch switch S1 is pressed, the pin 2 of the dimming controller MCU1 will become a low potential, making the flashlight light up. Long pressing the touch switch S1 will enter the LED dimming action, and the potential of the PWM pulse signal at pin 13 of the dimming controller MCU1 will change. The output end of the operational amplifier U4 will notify the boost converter U1, changing the current flowing through the LED to generate a voltage on the sixteenth resistor R16. After adjustment by the boost converter U1, the positive input will follow the potential equal to the reference voltage of the PWM pulse signal, and the dimming function will be achieved. As long as the voltage of the battery module (BAT1-BAT6) is above 7.5V, the LED dimming function can be switched among low, medium, high and flashing.

[0102] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A Bluetooth flashlight control circuit, It is characterized in that have: A main control module is configured in the control circuit, and is used to receive a voltage signal input from the battery module and perform voltage step-up / step-down processing on the voltage signal; A dimming module, whose power supply end is connected to an output end of the main control module, is used to receive the voltage signal. The PWM pulse signal output terminal of the dimming module is connected to a signal input terminal of the main control module for receiving the PWM pulse signal; A Bluetooth module, whose transmitting end / receiving end is respectively connected to the receiving end / transmitting end of the dimming module, for establishing a wireless communication connection and inputting a dimming instruction to the dimming module; When the main control module controls the LED module to work, the dimming module outputs the PWM pulse signal according to the dimming instruction, and adjusts the light-emitting mode of the LED module through the PWM pulse signal.

2. The Bluetooth flashlight control circuit according to claim 1, It is characterized in that The dimming module adjusts the duty cycle of the output PWM pulse signal according to the dimming instruction.

3. The Bluetooth flashlight control circuit according to claim 1, It is characterized in that The dimming module at least includes a dimming controller. The power supply end of the dimming controller is connected to an output end of the main control module. The PWM pulse signal output terminal of the dimming controller is connected to a signal input terminal of the main control module. The transmitting end / receiving end of the dimming controller is connected to the receiving end / transmitting end of the Bluetooth module respectively.

4. The Bluetooth flashlight control circuit according to claim 3, It is characterized in that The main control module at least includes a boost converter and an operational amplifier. The power input terminal of the boost converter is connected to the input terminal of the battery module, and is used to receive the voltage signal and perform boost processing on the voltage signal. The output end of the boost converter is connected to the positive electrode of the LED module, and the boosted voltage signal is used to trigger the LED module. The in-phase terminal of the operational amplifier is connected to the cathode of the LED module. The inverting terminal of the operational amplifier is connected to the PWM pulse signal output terminal of the dimming controller. The output terminal of the operational amplifier is coupled to the feedback terminal of the boost converter.

5. The Bluetooth flashlight control circuit according to claim 4, It is characterized in that The main control module also includes a voltage stabilizer. The input terminal of the voltage regulator is connected to an output terminal of the battery module. An output terminal of the voltage stabilizer is connected to a power input terminal of the dimming controller.

6. The Bluetooth flashlight control circuit according to claim 3, It is characterized in that The dimming module also includes a switch branch. A signal end of the switch branch is connected to a signal input end of the dimming controller. The other signal end of the switch branch is connected to the common end.

7. The Bluetooth flashlight control circuit according to claim 6, It is characterized in that Also includes undervoltage lockout protection module, One end of the undervoltage lockout protection module is connected to an output end of the battery module, The other end of the undervoltage lockout protection module is connected to the undervoltage feedback end of the dimming controller.

8. The Bluetooth flashlight control circuit according to claim 7, It is characterized in that It also includes an over-temperature protection module, the detection side of which is configured on the surface of the battery module and is used to obtain the temperature signal of the battery module. One end of the over-temperature protection module is connected to an output end of the main control module. The other end of the over-temperature protection module is connected to the temperature feedback end of the dimming controller.

Images