USB Bluetooth timer

Abstract

The utility model discloses a USB (Universal Serial Bus) Bluetooth timer, which comprises a shell and a circuit board, the circuit board is provided with a USB male head, a USB female head, a voltage reduction module, a Bluetooth module, an indication module and a button. The USB male head and the USB female head are welded to the two ends of the circuit board respectively and connected with the power supply device and the power utilization device respectively. VBUS pins of the USB male head and the USB female head are directly connected and are connected to the input end of the voltage reduction module through a diode D1; the voltage reduction module supplies power to the Bluetooth module; the grounding end of the USB female head is connected with the grounding end of the USB male head through an MOS tube Q1. The grounding end of the USB male head is the signal ground of the USB Bluetooth timer; a microprocessor is embedded in the Bluetooth module, and the Bluetooth module is provided with an output pin which is connected with the grid electrode of the MOS tube Q1 and the indication module, and is provided with an input interface which is connected with the key; and the other end of the key is grounded. The USB Bluetooth timer can be directly connected in series with a power supply circuit of a small-power electric appliance powered by a USB, performs timing control through Bluetooth, and has the characteristics of small size, convenience in use and the like.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to a USB Bluetooth timer suitable for low-power electrical appliances. Background Technology

[0002] Timers are frequently used in electrical applications. They are employed in the following situations: (1) Smart devices such as mobile phones and tablets have charging protection, but prolonged overcharging still poses a safety hazard. For safety and energy conservation, it is necessary to promptly disconnect the power to charging devices such as mobile phones and tablets. (2) Although USB nightlights have low power consumption, they still need to be turned off promptly to save energy and ensure sleep. In these applications, using existing timers with timing knobs or timing settings and displays would be inconvenient and costly. Utility Model Content

[0003] This utility model aims to provide a small-sized USB Bluetooth timer, which can be easily connected in series in the power supply circuit of low-power USB-powered electrical appliances, allowing smart terminals such as mobile phones to control the power supply circuit via Bluetooth for timing. The technical solution is as follows:

[0004] A USB Bluetooth timer includes a housing and a circuit board; the circuit board is provided with a USB male connector, a USB female connector, a step-down module, a Bluetooth module, an indicator module, and buttons;

[0005] The USB male and female connectors are soldered to both ends of the circuit board and connected to the power supply and the power consumption device, respectively. The VBUS pins of the USB male and female connectors are directly connected and connected to the input terminal of the step-down module through diode D1. The step-down module supplies power to the Bluetooth module. The ground terminal of the USB female connector is connected to the ground terminal of the USB male connector through MOSFET Q1. The ground terminal of the USB male connector serves as the signal ground for the USB Bluetooth timer.

[0006] The Bluetooth module has an embedded microprocessor. The Bluetooth module is provided with an output pin connected to the gate of the MOS transistor Q1 and the indicator module, and is provided with an input interface connected to the button; the other end of the button is grounded.

[0007] Furthermore, both the USB male connector and the USB female connector are USB-A type connectors.

[0008] Furthermore, the core of the buck module is a three-terminal LDO chip. It is small in size.

[0009] Furthermore, the Bluetooth module is powered by 3.3V.

[0010] Furthermore, the antenna of the Bluetooth module is an onboard antenna.

[0011] Furthermore, the MOS transistor Q1 is an N-channel MOS transistor.

[0012] Furthermore, the MOSFET Q1 is of model HC3039P, or other compatible model.

[0013] Furthermore, the indicator module is a common-anode tri-color LED chip, and the three output pins of the Bluetooth module are connected to the three cathodes of the tri-color LED chip; the anode of the tri-color LED chip is connected to the power supply of the Bluetooth module.

[0014] Technical effects:

[0015] This utility model's USB Bluetooth timer can be directly connected in series with the power supply circuit of a low-power USB-powered appliance and controlled via Bluetooth. It features small size and ease of use. Attached Figure Description

[0016] Figure 1 This is a simplified structural diagram of the product of this utility model;

[0017] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, this utility model provides a simplified structural diagram of a USB Bluetooth timer. It includes a housing 1 and a circuit board. The circuit board comprises a substrate 2, a USB male connector 3, a USB male connector 4, a Bluetooth chip 5, an LED chip 6, and a button 7. The USB male connector 3 protrudes from the housing, and the USB male connector 4 is located at both ends of the substrate 2; however, the USB male connector 3 protrudes from the housing, while the USB male connector 4 is essentially hidden within the housing. The Bluetooth chip 5, LED chip 6, and button 7 are soldered onto the substrate 2. The button 7 can be touched through the housing and generates a switching action.

[0021] In this embodiment, both the USB male connector USB1 and the USB female connector USB2 use USB-A type connectors. USB-A type connectors are larger in size and have stronger structural strength. In use, this device is rigidly connected to external devices via USB male connectors 3 and 4; USB male connector 3 is directly plugged into the charger, while the USB male connector of devices such as nightlights is directly connected to the USB male connector 4 of this device. The product connection is simple and convenient to use.

[0022] like Figure 2 As shown, the main components of this circuit board include a USB male connector (USB1), a USB female connector (USB2), a Bluetooth chip (U1), a step-down chip (U2), a tactile button (SW1), and an LED chip (LED1). The circuit connections of this circuit board are as follows:

[0023] USB male connector USB1 and USB female connector USB2 are soldered to both ends of the circuit board and connected to the power supply device (such as a USB charger, a socket with a USB power interface, etc.) and the power user device (such as a night light), respectively. The VBUS pins of USB male connector USB1 and USB female connector USB2 are directly connected and connected to the input terminal of LDO chip U2 through diode D1. LDO chip U2 supplies power to Bluetooth chip U1. The ground terminal of the USB female connector is connected to the ground terminal of the USB male connector through MOSFET Q1. The ground terminal of the USB male connector is the signal ground of the USB Bluetooth timer.

[0024] In this embodiment, the Bluetooth chip U1 embeds a microprocessor (the specific model is not limited), and its power supply voltage is 3.3V (power supply +3V3). The Bluetooth chip U1 has an output pin connected to the gate of MOSFET Q1 and LED chip LED1, and an input interface connected to button SW1; the other end of button SW1 is grounded. The Bluetooth chip provides a convenient wireless connection method, which can connect to devices such as mobile phones to solve the problems of timer operation space and display space, and also has the advantages of convenient connection and low power consumption.

[0025] In this embodiment, preferably, to simplify the product structure, the Bluetooth antenna is an onboard antenna, formed on the circuit board in a circuit manner.

[0026] In this embodiment, preferably, the step-down chip U2 is a three-terminal LDO chip, which is low-cost and small in size, and its package is usually SOT-223.

[0027] In this embodiment, preferably, the LED chip LED1 is a common-anode tri-color LED chip, and the three output pins of the Bluetooth chip U1 are connected to the three cathodes of the LED chip LED1; the anode of the LED chip LED1 is connected to the 3.3V power supply +3V3. Through color combination and modulation control, the tri-color LED chip can provide rich indication functions, such as a constant-on state or a green state during normal operation, a flashing state or a yellow state during timing, etc.

[0028] In this embodiment, preferably, the MOSFET Q1 is an N-channel MOSFET, model HC3039P, or other compatible models. MOSFETs are voltage-controlled and feature small size, high current carrying capacity, and low power consumption. The Bluetooth chip U1 can output a single-level signal or a PWM signal. Through PWM control, the gate voltage of MOSFET Q1 can be adjusted, thereby controlling the USB output power.

[0029] In this embodiment, the product can utilize the wireless communication function of the Bluetooth chip to allow the timer to be set and started by a smart terminal such as a mobile phone; alternatively, the timer can be set and started by a single button (SW1). Furthermore, this timer can perform timed shutdown and / or timed power-on functions according to application requirements; the specific timing operations are implemented by the program and are not limited here. Using Bluetooth timing solves the problems of small size and limited operation and display space of this USB Bluetooth timer.

[0030] In summary, this utility model's USB Bluetooth timer is small in size and can be easily connected in series in the power supply circuit of low-power USB-powered electrical appliances, solving the problem of timed on / off control for these appliances.

[0031] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A USB Bluetooth timer, characterized in that: It includes a housing and a circuit board; the circuit board is equipped with a USB male connector, a USB female connector, a step-down module, a Bluetooth module, an indicator module, and buttons; The USB male and female connectors are soldered to both ends of the circuit board and connected to the power supply and the power consumption device, respectively. The VBUS pins of the USB male and female connectors are directly connected and connected to the input terminal of the step-down module through diode D1. The step-down module supplies power to the Bluetooth module. The ground terminal of the USB female connector is connected to the ground terminal of the USB male connector through MOSFET Q1. The ground terminal of the USB male connector serves as the signal ground for the USB Bluetooth timer. The Bluetooth module has an embedded microprocessor. The Bluetooth module is provided with an output pin connected to the gate of the MOS transistor Q1 and the indicator module, and is provided with an input interface connected to the button; the other end of the button is grounded.

2. The USB Bluetooth timer as described in claim 1, characterized in that: Both the USB male connector and the USB female connector are USB-A type connectors.

3. The USB Bluetooth timer as described in claim 1, characterized in that: The core of the buck module is a three-terminal LDO chip.

4. The USB Bluetooth timer as described in claim 1, characterized in that: The Bluetooth module is powered by 3.3V.

5. The USB Bluetooth timer as described in claim 1, characterized in that: The antenna of the Bluetooth module is an onboard antenna.

6. The USB Bluetooth timer as described in claim 1, characterized in that: The MOSFET Q1 is an N-channel MOSFET.

7. The USB Bluetooth timer as described in claim 1, characterized in that: The MOSFET Q1 is model HC3039P.

8. The USB Bluetooth timer as described in claim 1, characterized in that: The indicator module is a common-anode tri-color LED chip, and the three output pins of the Bluetooth module are connected to the three cathodes of the tri-color LED chip; the anode of the tri-color LED chip is connected to the power supply of the Bluetooth module.

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