A portable fan gear display circuit

Abstract

The utility model relates to fan circuit technical field discloses a portable fan gear display circuit with higher reliability and stability, including the main control circuit (110) for output control signal, charging and rotating speed control circuit (120) and display circuit (130), wherein, charging and rotating speed control circuit (120) are triggered by the control signal input, to control the work of motor, and the main control circuit (110) is converted to gear signal according to the duty cycle of current output control signal, display circuit (130) is used for receiving gear signal, and according to gear signal display current motor (M1) gear.

Description

Technical Field

[0001] This utility model relates to the field of fan circuit technology, and more specifically, to a portable fan speed display circuit. Background Technology

[0002] To simplify their structure and reduce costs, existing handheld fans typically only have an indicator light to show whether the fan is working or to flash when the battery is low to remind the user to charge. However, while using a handheld fan, the user cannot know the current speed setting, whether the fan speed is high or low, or how to utilize the fan's battery power. Utility Model Content

[0003] The technical problem this invention aims to solve is to address the shortcomings of existing handheld fans, such as the user's inability to know the current speed setting, whether the fan speed is high or low, and how to utilize the fan's battery capacity. This invention provides a highly reliable and stable portable fan speed display circuit.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a portable motor gear display circuit, which has the following features:

[0005] The main control circuit, which is configured within the gear position display circuit, is used to output control signals;

[0006] The charging and speed control circuit has one input terminal connected to the power supply output terminal to receive the charging current signal.

[0007] A signal input terminal of the charging and speed control circuit is coupled to a signal output terminal of the main control circuit for receiving the control signal.

[0008] The charging and speed control circuit is triggered by the input control signal to control the operation of the motor. The main control circuit converts the duty cycle of the currently output control signal into a gear signal.

[0009] The display circuit has its input terminal connected to another signal output terminal of the main control circuit. It is used to receive the gear position signal and display the current gear position of the motor according to the gear position signal.

[0010] In some embodiments, the main control circuit includes at least one main controller.

[0011] A feedback terminal of the main controller is connected to an output terminal of the charging and speed control circuit.

[0012] One signal output terminal of the main controller is connected to one signal input terminal of the charging and speed control circuit.

[0013] The other signal output terminal of the main controller is connected to the input terminal of the display circuit.

[0014] In some implementations, the main control circuit further includes a tactile switch.

[0015] One end of the tactile switch is connected to a signal input terminal of the main controller. The main controller receives the level signal output when the tactile switch is triggered, and adjusts the duty cycle of the control signal according to the input level signal.

[0016] The other end of the tactile switch is connected to the common terminal.

[0017] In some embodiments, the charging and speed control circuit includes at least a charging controller, a MOSFET, and a motor.

[0018] The power supply terminal of the charging controller is connected to the power output terminal.

[0019] One output terminal of the charging controller is connected to the positive terminal of the motor and the battery.

[0020] The gate of the MOS transistor is connected to a signal output terminal of the main controller.

[0021] The drain of the MOSFET is connected to the negative terminal of the motor.

[0022] The source of the MOS transistor is connected to the common terminal.

[0023] In some embodiments, the MOS transistor is selected as an N-channel enhancement-mode MOS transistor.

[0024] In some embodiments, the charging and speed control circuit further includes a voltage divider circuit.

[0025] The first terminal of the voltage divider circuit is connected to the positive terminal of the battery.

[0026] The second terminal of the voltage divider circuit is connected to a feedback terminal of the main controller.

[0027] The third terminal of the voltage divider circuit is connected to the common terminal.

[0028] In some embodiments, the voltage divider circuit includes an eighth resistor and a tenth resistor connected in series.

[0029] One end of the eighth resistor is connected to the positive terminal of the battery.

[0030] The connection terminal of the eighth resistor and the tenth resistor is connected to a feedback terminal of the main controller.

[0031] One end of the tenth resistor is connected to the common terminal.

[0032] In some embodiments, the display circuit includes at least transistors and digital tubes.

[0033] The base of the transistor is connected to another signal output terminal of the main controller.

[0034] The signal input terminal of the digital tube is connected to the collector of the transistor.

[0035] The power supply terminals of the digital tube are connected to the signal output terminals of the main controller.

[0036] The emitter of the transistor is connected to the common terminal.

[0037] In some implementations, the transistor is selected as an NPN transistor.

[0038] The portable fan speed display circuit of this invention includes a main control circuit for outputting control signals, a charging and speed control circuit, and a display circuit. The charging and speed control circuit is triggered by the input control signal to control the motor's operation. The main control circuit converts the duty cycle of the currently output control signal into a speed signal. The display circuit receives the speed signal and displays the current motor speed. Compared with existing technologies, by adding a digital speed display, the motor speed can be adjusted intuitively to meet the power consumption requirements. This effectively solves the problem that users cannot know the current speed of the handheld motor, whether the motor speed is high or low, or how to utilize the motor's power during use. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0040] Figure 1 This is a circuit schematic diagram of an embodiment of the main control circuit provided by this utility model;

[0041] Figure 2 This is a circuit diagram of an embodiment of the charging and speed control circuit provided by this utility model;

[0042] Figure 3 This is a circuit diagram of an embodiment of the display circuit provided by this utility model. Detailed Implementation

[0043] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0044] like Figures 1-3As shown, in the first embodiment of the portable fan speed display circuit of this utility model, the portable fan speed display circuit includes a main control circuit 110, a charging and speed control circuit 120, and a display circuit 130.

[0045] The main control circuit 110 is used for calculation, signal reception / processing, and output of control signals / display signals;

[0046] The charging and speed control circuit 120 is used to receive the current signal input from the USB_C terminal to charge the battery BT1 and to receive the control signal (high level / low level) input from the main control circuit 110 to control the working state of the motor M1 (or fan).

[0047] The display circuit 130 is used to display the gear position of the motor M1 and the power level.

[0048] Specifically, the main control circuit 110 is configured within the gear position display circuit and is used to output control signals / display signals;

[0049] One input terminal of the charging and speed control circuit 120 is connected to the power output terminal (corresponding to the VCC terminal) to receive the charging current signal in order to charge the battery BT1.

[0050] A signal input terminal of the charging and speed control circuit 120 is coupled to a signal output terminal of the main control circuit 110 for receiving control signals.

[0051] When the input control signal is high, the charging and speed control circuit 120 is activated.

[0052] When the input control signal is high, the charging and speed control circuit 120 is turned off.

[0053] The charging and speed control circuit 120 is triggered by the input control signal to control the operation of the motor M1. The main control circuit 110 converts the duty cycle of the currently output control signal into a gear signal.

[0054] Furthermore, the input terminal of the display circuit 130 is connected to another signal output terminal of the main control circuit 110, which is used to receive the gear signal and display the current gear of the motor M1 according to the gear signal.

[0055] By adding a digital display of gear positions, the motor speed can be adjusted intuitively to meet the power consumption requirements. This effectively solves the problem that users cannot know the current gear position of the handheld motor, whether the motor speed is high or low, or how to utilize the motor's power.

[0056] In some implementations, such as Figure 1As shown, to ensure the reliability of motor M1, a main controller U1 can be set in the main control circuit 110, which is used to output control signals / display signals;

[0057] Specifically, a feedback terminal (corresponding to pin 19) of the main controller U1 is connected to an output terminal of the charging and speed control circuit 120, used to obtain the current voltage value of the battery BT1, and change the level of the control signal according to the current voltage value of the battery BT1.

[0058] For example, when the voltage of battery BT1 is lower than 3.0V, the control signal output by the main controller U1 is low, the motor M1 stops working, and the motor M1 can only work normally after the battery BT1 is recharged.

[0059] One signal output terminal (corresponding to pin 12) of the main controller U1 is connected to one signal input terminal of the charging and speed control circuit 120, and is used to receive the control signal output by the main controller U1.

[0060] Another signal output terminal of the main controller U1 (corresponding to pin 13) is connected to the input terminal of the display circuit 130 to receive the display signal when the motor M1 is controlled to work.

[0061] In some implementations, such as Figure 1 As shown, the main control circuit 110 also includes a tactile switch SW1, which is used to output a level signal generated when touched.

[0062] Specifically, one end of the tactile switch SW1 (corresponding to pin 2) is connected to a signal input terminal (corresponding to pin 2) of the main controller U1. The main controller U1 receives the level signal output when the tactile switch SW1 is triggered. The main controller U1 adjusts the duty cycle of the control signal according to the input level signal to regulate the speed of the motor M1.

[0063] The other end of the tactile switch SW1 (corresponding to pin 1) is connected to the common terminal.

[0064] For example, motor M1 has four gears, namely gear 1 to gear 4.

[0065] The duty cycle for gear 1 is 25%.

[0066] The duty cycle for gear 2 is 50%.

[0067] The duty cycle for gear 3 is 75%, and the duty cycle for gear 4 is 100%.

[0068] When the duty cycle is 0%, motor M1 stops rotating, and the maximum wind speed is 25 m / s.

[0069] In some implementations, such as Figure 2As shown, to improve circuit performance, a charging controller U2, a MOSFET Q3, and a motor M1 can be included in the charging and speed control circuit 120.

[0070] Among them, the charging controller U2 features high-efficiency charging, simplified design, intelligent thermal regulation, and high-precision preset voltage.

[0071] MOSFET Q3 functions as a switch, and it is selected as an N-channel enhancement-mode MOSFET.

[0072] Specifically, the power supply terminal (corresponding to pin 4) of the charging controller U2 is connected to the power output terminal (corresponding to VCC).

[0073] One output terminal (corresponding to pin 3) of the charging controller U2 is connected to the positive terminal of the motor M1 and the battery BT1.

[0074] The gate of MOSFET Q3 is connected to a signal output terminal (pin 12) of the main controller U1 via resistor R16 to receive control signals.

[0075] The drain of MOSFET Q3 is connected to the negative terminal of motor M1.

[0076] The gate of MOSFET Q3 is connected to its source through the eighteenth resistor R18.

[0077] The source of MOSFET Q3 is connected to the common terminal.

[0078] When the input control signal is low, MOSFET Q3 is in the off state.

[0079] When the input control signal is high, MOSFET Q3 is turned on. The current signal output by battery BT1 passes through the positive and negative terminals of motor M1 and the drain and source of MOSFET Q3 to the common terminal, thereby controlling the operation of motor M1. The corresponding output level signal can be made by touching the light switch SW1. The main controller U1 adjusts the duty cycle of the output control signal according to the input level signal.

[0080] In some implementations, such as Figure 2 As shown, in order to improve the lifespan of battery BT1, a voltage divider circuit can be set in the charging and speed control circuit 120, which has the functions of signal sampling and voltage division.

[0081] Specifically, the first terminal of the voltage divider circuit is connected to the positive terminal of battery BT1 to obtain the voltage value of battery BT1.

[0082] The second terminal of the voltage divider circuit is connected to a feedback terminal (corresponding to pin 19) of the main controller U1, and outputs the acquired voltage value to the main controller U1. The main controller U1 can change the level of the control signal according to the current voltage value of battery BT1.

[0083] The third terminal of the voltage divider circuit is connected to the common terminal.

[0084] Furthermore, the voltage divider circuit includes an eighth resistor R8 and a tenth resistor R10 connected in series.

[0085] One end of the eighth resistor R8 is connected to the positive terminal of battery BT1.

[0086] The connection terminals of the eighth resistor R8 and the tenth resistor R10 are connected to a feedback terminal (corresponding to pin 19) of the main controller U1. The voltage of battery BT1 is divided by the eighth resistor R8 and the tenth resistor R10 before being output to the main controller U1.

[0087] One end of the tenth resistor R10 is connected to the common terminal.

[0088] In some implementations, to improve the performance of the product, a transistor Q1 and a digital LED1 can be provided in the display circuit 130. The transistor Q1 is selected as an NPN transistor, which functions as a switch.

[0089] Specifically, the base of transistor Q1 is connected to another signal output terminal (corresponding to pin 13) of the main controller U1 through resistor R7, which is used to receive the display signal output by the main controller U1.

[0090] The signal input terminal (corresponding to pin 5) of the digital tube LED1 is connected to the collector of transistor Q1.

[0091] The power supply terminal (corresponding to the af terminal) of the digital tube LED1 is connected to the signal output terminal (corresponding to the af terminal) of the main controller U1.

[0092] The emitter of transistor Q1 is connected to the common terminal.

[0093] Specifically, when the battery voltage is less than 4.2V, when a charger is connected to USB_C and charges battery BT1 with 5V, that is, the 5V voltage enters the internal constant current circuit of the charging controller U2 through pin 4 to charge battery BT1. The charging current is 200mA. The sixth resistor R6 is a programmable charging current setting. Currently, when connected to a 3.3K resistor ground, the charging current is 200mA. The fourth resistor R4 and LED2 are charging indicators. They flash during charging and stay lit when fully charged.

[0094] Diode D1 supplies power to the main controller U1 via battery BT1. Resistors R8 and R10 are used for battery voltage detection and are sent to the main controller U1 for detection. When the voltage of battery BT1 is lower than 3.0V, the fan stops working and needs to be recharged before the fan can work normally.

[0095] The fan operating circuit consists of battery BT1, motor M1, MOSFET Q3, eighteenth resistor R18, and sixteenth resistor R16. The speed of motor M1 (fan) is controlled by the PWM signal of network "FAN_ON" through the sixteenth resistor R16, eighteenth resistor R18, and MOSFET Q3.

[0096] Transistor Q1, resistor R7 (seventh resistor), and resistor R12 (twelfth resistor) form a common cathode circuit, providing a current loop for each segment of the LED1 digital display. LED1, resistors R1 (first resistor), R2 (second resistor), R3 (third resistor), R5 (fifth resistor), R9 (ninth resistor), R11 (eleventh resistor), R13 (thirteenth resistor), and R14 (fourteenth resistor) form the digital display segments, corresponding to the networks "a, b, c, d, e, f, g, DP," which are connected to the corresponding networks of the main controller U1.

[0097] When the touch switch SW1 is pressed for the first time, the LED1 light on the digital tube will display the number 1, indicating level 1, with a fan speed of 25%.

[0098] When the touch switch SW1 is pressed a second time, the LED1 light on the digital tube will display the number 2, indicating that the fan speed is 50% and the setting is 2.

[0099] When the touch switch SW1 is pressed for the third time, the LED1 light on the digital tube will display 3 levels, with a fan speed of 75%.

[0100] When the touch switch SW1 is pressed for the fourth time, the LED1 light on the digital tube will display 4 levels, indicating a fan speed of 100%.

[0101] When the tactile switch SW1 is pressed for the fifth time, the motor M1 (fan) stops working.

[0102] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A portable fan speed display circuit, characterized in that, have: The main control circuit, which is configured within the gear position display circuit, is used to output control signals; The charging and speed control circuit has one input terminal connected to the power supply output terminal to receive the charging current signal. A signal input terminal of the charging and speed control circuit is coupled to a signal output terminal of the main control circuit for receiving the control signal. The charging and speed control circuit is triggered by the input control signal to control the operation of the motor. The main control circuit converts the duty cycle of the currently output control signal into a gear signal. The display circuit has its input terminal connected to another signal output terminal of the main control circuit. It is used to receive the gear position signal and display the current gear position of the motor according to the gear position signal.

2. The portable fan speed display circuit according to claim 1, characterized in that, The main control circuit includes at least one main controller. A feedback terminal of the main controller is connected to an output terminal of the charging and speed control circuit. One signal output terminal of the main controller is connected to one signal input terminal of the charging and speed control circuit. The other signal output terminal of the main controller is connected to the input terminal of the display circuit.

3. The portable fan speed display circuit according to claim 2, characterized in that, The main control circuit also includes a tactile switch. One end of the tactile switch is connected to a signal input terminal of the main controller. The main controller receives the level signal output when the tactile switch is triggered, and adjusts the duty cycle of the control signal according to the input level signal. The other end of the tactile switch is connected to the common terminal.

4. The portable fan speed display circuit according to claim 3, characterized in that, The charging and speed control circuit includes at least a charging controller, a MOSFET, and a motor. The power supply terminal of the charging controller is connected to the power output terminal. One output terminal of the charging controller is connected to the positive terminal of the motor and the battery. The gate of the MOS transistor is connected to a signal output terminal of the main controller. The drain of the MOSFET is connected to the negative terminal of the motor. The source of the MOS transistor is connected to the common terminal.

5. The portable fan speed display circuit according to claim 4, characterized in that, The MOSFET is selected as an N-channel enhancement-mode MOSFET.

6. The portable fan speed display circuit according to claim 4, characterized in that, The charging and speed control circuit also includes a voltage divider circuit. The first terminal of the voltage divider circuit is connected to the positive terminal of the battery. The second terminal of the voltage divider circuit is connected to a feedback terminal of the main controller. The third terminal of the voltage divider circuit is connected to the common terminal.

7. The portable fan speed display circuit according to claim 6, characterized in that, The voltage divider circuit includes an eighth resistor and a tenth resistor connected in series. One end of the eighth resistor is connected to the positive terminal of the battery. The connection terminal of the eighth resistor and the tenth resistor is connected to a feedback terminal of the main controller. One end of the tenth resistor is connected to the common terminal.

8. The portable fan speed display circuit according to claim 7, characterized in that, The display circuit includes at least transistors and digital tubes. The base of the transistor is connected to another signal output terminal of the main controller. The signal input terminal of the digital tube is connected to the collector of the transistor. The power supply terminals of the digital tube are connected to the signal output terminals of the main controller. The emitter of the transistor is connected to the common terminal.

9. The portable fan speed display circuit according to claim 8, characterized in that, The transistor selected is an NPN type transistor.

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