A wireless charging transmission circuit for wearable devices

Abstract

This utility model relates to a wireless charging transmission circuit for wearable devices, including a charging time control circuit and a charging transmission circuit. During use, the charging time control circuit allows setting the operating time of the charging transmission circuit, causing it to stop operating after the set time. This utility model features a scientifically designed circuit that limits the maximum charging time, preventing prolonged battery charging, protecting the device, and improving electrical safety.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a wireless charging transmission circuit for wearable devices. Background Technology

[0002] Wearable medical devices refer to portable medical / health electronic devices that can be worn directly on the user's body for sensing, recording, analyzing, regulating, intervening in, and even treating diseases or maintaining a healthy state. With the development of wireless charging technology, some wearable medical devices now also use wireless charging technology for convenient charging.

[0003] Currently, the wireless charging transmission circuits used in wearable medical devices continue to operate regardless of whether the device is fully charged, or if the battery has poor contact, malfunctions, or other reasons that prevent it from charging for an extended period. Prolonged operation of the wireless charging transmission circuit can damage both the circuit and the device, and in severe cases, may even cause the device's battery to explode, posing a potential electrical safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide a wireless charging transmission circuit for wearable devices. This wireless charging transmission circuit for wearable devices has the advantages of scientific design, the ability to limit the maximum charging time during application, the prevention of prolonged battery charging, protection of the device, and improved electrical safety.

[0005] The technical solution of this utility model is implemented as follows: a wireless charging transmission circuit for a wearable device, specifically including a charging time control circuit and a charging transmission circuit; wherein:

[0006] The charging time control circuit includes chip U2, chip U3, resistor R3, resistor R4, resistor R5, resistor R10, button K1, capacitor C4, capacitor C5, capacitor C6 and capacitor C8.

[0007] The model number of chip U2 is SN74LVC2G74DCUR, and the model number of chip U3 is TPL5010DDCR;

[0008] Pin 1 of chip U3 is electrically connected to power supply VCC; pins 2 and 5 of chip U3 are both grounded; pin 3 of chip U3 is electrically connected to one end of resistor R4 and one end of capacitor C5, and the other ends of resistor R4 and capacitor C5 are both grounded; pin 4 of chip U3 is electrically connected to pin 1 of chip U2; pin 6 of chip U3 is electrically connected to one end of resistor R5, and the other end of resistor R5 is electrically connected to power supply VCC.

[0009] One end of the resistor R3 is electrically connected to the power supply VCC, the other end of the resistor R3 is electrically connected to the first connection terminal of the button K1, and the second connection terminal of the button K1 is electrically connected to the third pin of the chip U3.

[0010] One end of capacitor C4 is electrically connected to pin 6 of chip U3, and the other end of capacitor C4 is grounded.

[0011] Pin 2 of chip U2 is electrically connected to one end of capacitor C6 and one end of resistor R10 respectively. The other end of capacitor C6 is grounded, and the other end of resistor R10 is electrically connected to pin 3 of chip U2. Pin 4 of chip U2 is grounded. Pin 5 of chip U2 is electrically connected to the control connection terminal of the charging transmission circuit. Pin 6 of chip U2 is electrically connected to connection terminal 2 of button K1 and pin 6 of chip U3 respectively. Pins 7 and 8 of chip U2 are both electrically connected to power supply VCC.

[0012] One end of capacitor C8 is electrically connected to pin 8 of chip U2, and the other end of capacitor C8 is grounded.

[0013] This solution combines a charging time control circuit with a charging transmission circuit. Chip U2 is a single-channel rising edge-triggered D-type flip-flop with clear and preset functions, and chip U3 is a low-power system timer. Chip U3 determines the timing time based on the value of resistor R4. The working process of this solution is as follows:

[0014] 1. After power-on, pin 6 of chip U3 is reset and chip U3 starts working. At the moment of power-on, pin 6 of chip U3 generates a low-level reset signal. After receiving the reset signal, chip U2 is internally cleared.

[0015] 2. During the charging process, pin 4 of chip U3 will output a low level. After pin 1 of chip U2 receives the low level output from pin 4 of chip U3, pin 5 of chip U2 will output a high level signal in reverse. After the charging transmitting circuit receives the high level signal output from pin 5 of chip U2, it will start working to charge the electrical equipment.

[0016] 3. When the timer expires, pin 4 of chip U3 will output a high pulse. After pin 1 of chip U2 receives the high pulse from pin 4 of chip U3, pin 5 of chip U2 will output a low-level signal in reverse. After the charging transmitting circuit receives the low-level signal from pin 5 of chip U2, it will stop working, thus stopping the charging of the device.

[0017] 4. When charging is required again, press button K1 to reset chip U3 and start chip U3 working. Pressing button K1 generates a low-level reset signal. After receiving the reset signal, chip U2 is internally cleared. Then, the process of steps 2 and 3 above is repeated to restart charging and charging timer control.

[0018] Furthermore, the charging time control circuit also includes chip U4 and capacitor C7; the model of chip U4 is SN74LVC2G17DBVR; pin 4 of chip U3 is electrically connected to pin 1 of chip U4, and then to pin 1 of chip U2 through pin 6 of chip U4; pin 2 of button K1 and pin 6 of chip U3 are electrically connected to pin 3 of chip U4, and then to pin 6 of chip U2 through pin 4 of chip U4; pin 2 of chip U4 is grounded; pin 5 of chip U4 is electrically connected to power supply VCC; one end of capacitor C7 is electrically connected to pin 5 of chip U4, and the other end of capacitor C7 is grounded.

[0019] Furthermore, the resistance value of resistor R4 is preferably in the range of 100Ω to 170Ω.

[0020] Furthermore, the charging transmission circuit includes chip U1, resistors R1 and R2, capacitors C1, C2, and C3, and a transmitting coil L1; wherein:

[0021] The chip U1 is model XKT-511; pin 1 of chip U1 is electrically connected to one end of resistors R1 and R2 respectively, the other end of resistor R1 is electrically connected to power supply VCC, and the other end of resistor R2 is electrically connected to pin 2 of chip U1; pins 3 and 4 of chip U1 are grounded; pin 5 of chip U1 is electrically connected to one end of capacitor C3 and transmitting coil L1 respectively, and pin 6 of chip U1 is electrically connected to the other end of capacitor C3 and transmitting coil L1 respectively; pin 7 of chip U1 is electrically connected to power supply VCC; pin 8 of chip U1 is the control connection terminal;

[0022] Capacitor C1 is an electrolytic capacitor. The positive terminal of capacitor C1 and one end of capacitor C2 are both electrically connected to pin 7 of chip U1, while the negative terminal of capacitor C1 and the other end of capacitor C2 are both grounded.

[0023] Furthermore, the wireless charging transmission circuit of this wearable device also includes a PCB board, and the charging time control circuit and the charging transmission circuit are both set on the PCB board. The transmitting coil L1 is formed by etching on the PCB board.

[0024] Furthermore, the wireless charging transmission circuit of this wearable device also includes a charging status indication circuit, which includes an NMOS transistor Q406, resistors R8 and R11, and a light-emitting diode LED2. The NMOS transistor Q406 is a CJBA3134K. The gate (G) of the NMOS transistor Q406 and one end of resistor R11 are both electrically connected to pin 5 of chip U2, and the drain (D) of the NMOS transistor Q406 and the other end of resistor R11 are both grounded. The negative terminal of the light-emitting diode LED2 is electrically connected to the source (S) of the NMOS transistor Q406. One end of resistor R8 is electrically connected to the positive terminal of the light-emitting diode LED2, and the other end of resistor R8 is electrically connected to the power supply VCC.

[0025] Furthermore, the wireless charging transmission circuit of this wearable device also includes a power status indicator circuit; the power status indicator circuit includes a resistor R7 and a light-emitting diode LED1; the negative terminal of the light-emitting diode LED1 is grounded; one end of the resistor R7 is electrically connected to the positive terminal of the light-emitting diode LED1, and the other end of the resistor R7 is electrically connected to the power supply VCC.

[0026] Furthermore, the light-emitting color of LED2 is different from the light-emitting color of LED1.

[0027] The advantages of this utility model are: it has a scientific design, can limit the maximum charging time during application, avoids the phenomenon of prolonged battery charging, can protect the equipment, and can improve the safety of electricity use. Attached Figure Description

[0028] Figure 1 The circuit schematic is shown in the example diagram.

[0029] Explanation of reference numerals in the attached diagram: 1-Charging time control circuit; 2-Charging transmission circuit; 3-Charging status indication circuit; 4-Power status indication circuit. Detailed Implementation

[0030] like Figure 1 As shown, a wireless charging transmission circuit for a wearable device according to this embodiment includes a charging time control circuit 1 and a charging transmission circuit 2; wherein:

[0031] The charging time control circuit 1 includes chip U2, chip U3, resistor R3, resistor R4, resistor R5, resistor R10, button K1, capacitor C4, capacitor C5, capacitor C6 and capacitor C8.

[0032] The model number of chip U2 is SN74LVC2G74DCUR, and the model number of chip U3 is TPL5010DDCR;

[0033] Pin 1 of chip U3 is electrically connected to power supply VCC; pins 2 and 5 of chip U3 are both grounded; pin 3 of chip U3 is electrically connected to one end of resistor R4 and one end of capacitor C5, and the other ends of resistor R4 and capacitor C5 are both grounded; pin 4 of chip U3 is electrically connected to pin 1 of chip U2; pin 6 of chip U3 is electrically connected to one end of resistor R5, and the other end of resistor R5 is electrically connected to power supply VCC.

[0034] One end of the resistor R3 is electrically connected to the power supply VCC, the other end of the resistor R3 is electrically connected to the first connection terminal of the button K1, and the second connection terminal of the button K1 is electrically connected to the third pin of the chip U3.

[0035] One end of capacitor C4 is electrically connected to pin 6 of chip U3, and the other end of capacitor C4 is grounded.

[0036] Pin 2 of chip U2 is electrically connected to one end of capacitor C6 and one end of resistor R10 respectively. The other end of capacitor C6 is grounded, and the other end of resistor R10 is electrically connected to pin 3 of chip U2. Pin 4 of chip U2 is grounded. Pin 5 of chip U2 is electrically connected to the control connection terminal provided in charging transmission circuit 2. Pin 6 of chip U2 is electrically connected to connection terminal 2 of button K1 and pin 6 of chip U3 respectively. Pins 7 and 8 of chip U2 are both electrically connected to power supply VCC.

[0037] One end of capacitor C8 is electrically connected to pin 8 of chip U2, and the other end of capacitor C8 is grounded. This design allows the charging time control circuit 1 to set the operating time of the charging transmission circuit 2, ensuring that the charging transmission circuit 2 stops working after the set time. This prevents the battery from charging for extended periods during application and protects the device.

[0038] like Figure 1 As shown, the charging time control circuit 1 also includes chip U4 and capacitor C7; the model of chip U4 is SN74LVC2G17DBVR; pin 4 of chip U3 is electrically connected to pin 1 of chip U4, and then to pin 1 of chip U2 through pin 6 of chip U4; pin 2 of button K1 and pin 6 of chip U3 are electrically connected to pin 3 of chip U4, and then to pin 6 of chip U2 through pin 4 of chip U4; pin 2 of chip U4 is grounded; pin 5 of chip U4 is electrically connected to the power supply VCC; one end of capacitor C7 is electrically connected to pin 5 of chip U4, and the other end of capacitor C7 is grounded. This design avoids interference with the signal input to chip U2, resulting in better stability of the wireless charging transmission circuit of this wearable device.

[0039] like Figure 1As shown, the resistance of resistor R4 is 170Ω. This design sets the timing duration of chip U3 to 2 hours, giving the wireless charging transmitter circuit of this wearable device sufficient time to fully charge the device during application.

[0040] To make the design of charging transmission circuit 2 more reasonable, such as Figure 1 As shown, the charging transmission circuit 2 includes chip U1, resistor R1, resistor R2, capacitor C1, capacitor C2, capacitor C3, and transmitting coil L1; wherein:

[0041] The chip U1 is model XKT-511; pin 1 of chip U1 is electrically connected to one end of resistors R1 and R2 respectively, the other end of resistor R1 is electrically connected to power supply VCC, and the other end of resistor R2 is electrically connected to pin 2 of chip U1; pins 3 and 4 of chip U1 are grounded; pin 5 of chip U1 is electrically connected to one end of capacitor C3 and transmitting coil L1 respectively, and pin 6 of chip U1 is electrically connected to the other end of capacitor C3 and transmitting coil L1 respectively; pin 7 of chip U1 is electrically connected to power supply VCC; pin 8 of chip U1 is the control connection terminal;

[0042] Capacitor C1 is an electrolytic capacitor. The positive terminal of capacitor C1 and one end of capacitor C2 are both electrically connected to pin 7 of chip U1, while the negative terminal of capacitor C1 and the other end of capacitor C2 are both grounded.

[0043] The wireless charging transmission circuit of this wearable device also includes a PCB board. The charging time control circuit 1 and the charging transmission circuit 2 are both mounted on the PCB board (the PCB board is not shown in the attached diagram). The transmission coil L1 is formed by etching onto the PCB board. This design eliminates the need for metal wires in the transmission coil L1, reducing production costs and weight.

[0044] To make the wireless charging transmitter circuit of this wearable device more convenient to use, such as... Figure 1As shown, the wireless charging transmission circuit of this wearable device also includes a charging status indicator circuit 3. The charging status indicator circuit 3 includes an NMOS transistor Q406, resistors R8 and R11, and a light-emitting diode (LED2). The NMOS transistor Q406 is a CJBA3134K. The gate (G) of the NMOS transistor Q406 and one end of resistor R11 are electrically connected to pin 5 of chip U2, while the drain (D) of the NMOS transistor Q406 and the other end of resistor R11 are grounded. The negative terminal of the LED2 is electrically connected to the source (S) of the NMOS transistor Q406. One end of resistor R8 is electrically connected to the positive terminal of LED2, and the other end of resistor R8 is electrically connected to the power supply VCC. During use, the LED2 lights up when the charging transmission circuit 2 is working, informing the user that charging is in progress. Correspondingly, when the charging transmission circuit 2 stops working, the LED2 turns off.

[0045] To make the wireless charging transmitter circuit of this wearable device more convenient to use, such as... Figure 1 As shown, the wireless charging transmission circuit of this wearable device also includes a power status indicator circuit 4; the power status indicator circuit 4 includes a resistor R7 and a light-emitting diode LED1; the negative terminal of the light-emitting diode LED1 is grounded; one end of the resistor R7 is electrically connected to the positive terminal of the light-emitting diode LED1, and the other end of the resistor R7 is electrically connected to the power supply VCC. In use, after power-on, the light-emitting diode LED1 lights up, indicating to the user that the wireless charging transmission circuit of this wearable device is powered.

[0046] To easily distinguish the usage status of the wireless charging transmission circuit of this wearable device, such as Figure 1 As shown, the light-emitting color of LED2 is different from that of LED1.

Claims

1. A wireless charging transmission circuit for a wearable device, characterized in that: Includes a charging time control circuit and a charging transmission circuit; wherein: The charging time control circuit includes chip U2, chip U3, resistor R3, resistor R4, resistor R5, resistor R10, button K1, capacitor C4, capacitor C5, capacitor C6 and capacitor C8. The model number of chip U2 is SN74LVC2G74DCUR, and the model number of chip U3 is TPL5010DDCR; Pin 1 of chip U3 is electrically connected to power supply VCC; pins 2 and 5 of chip U3 are both grounded; pin 3 of chip U3 is electrically connected to one end of resistor R4 and one end of capacitor C5, and the other ends of resistor R4 and capacitor C5 are both grounded; pin 4 of chip U3 is electrically connected to pin 1 of chip U2; pin 6 of chip U3 is electrically connected to one end of resistor R5, and the other end of resistor R5 is electrically connected to power supply VCC. One end of the resistor R3 is electrically connected to the power supply VCC, the other end of the resistor R3 is electrically connected to the first connection terminal of the button K1, and the second connection terminal of the button K1 is electrically connected to the third pin of the chip U3. One end of capacitor C4 is electrically connected to pin 6 of chip U3, and the other end of capacitor C4 is grounded. Pin 2 of chip U2 is electrically connected to one end of capacitor C6 and one end of resistor R10 respectively. The other end of capacitor C6 is grounded, and the other end of resistor R10 is electrically connected to pin 3 of chip U2. Pin 4 of chip U2 is grounded. Pin 5 of chip U2 is electrically connected to the control connection terminal of the charging transmission circuit. Pin 6 of chip U2 is electrically connected to connection terminal 2 of button K1 and pin 6 of chip U3 respectively. Pins 7 and 8 of chip U2 are both electrically connected to power supply VCC. One end of capacitor C8 is electrically connected to pin 8 of chip U2, and the other end of capacitor C8 is grounded. 2.The wireless charging transmitting circuit of a wearable device of claim 1, wherein: The charging time control circuit also includes chip U4 and capacitor C7; the model of chip U4 is SN74LVC2G17DBVR; pin 4 of chip U3 is electrically connected to pin 1 of chip U4, and then to pin 1 of chip U2 through pin 6 of chip U4; pin 2 of button K1 and pin 6 of chip U3 are electrically connected to pin 3 of chip U4, and then to pin 6 of chip U2 through pin 4 of chip U4; pin 2 of chip U4 is grounded; pin 5 of chip U4 is electrically connected to power supply VCC; one end of capacitor C7 is electrically connected to pin 5 of chip U4, and the other end of capacitor C7 is grounded.

3. The wireless charging transmission circuit for a wearable device according to claim 1, characterized in that: The resistance value of resistor R4 is in the range of 100Ω to 170Ω.

4. The wireless charging transmitting circuit of a wearable device according to claim 1 or 2 or 3, characterized in that: The charging and transmitting circuit includes chip U1, resistor R1, resistor R2, capacitor C1, capacitor C2, capacitor C3, and transmitting coil L1; wherein: The chip U1 is model XKT-511; pin 1 of chip U1 is electrically connected to one end of resistors R1 and R2 respectively, the other end of resistor R1 is electrically connected to power supply VCC, and the other end of resistor R2 is electrically connected to pin 2 of chip U1; pins 3 and 4 of chip U1 are grounded; pin 5 of chip U1 is electrically connected to one end of capacitor C3 and transmitting coil L1 respectively, and pin 6 of chip U1 is electrically connected to the other end of capacitor C3 and transmitting coil L1 respectively; pin 7 of chip U1 is electrically connected to power supply VCC; pin 8 of chip U1 is the control connection terminal; Capacitor C1 is an electrolytic capacitor. The positive terminal of capacitor C1 and one end of capacitor C2 are both electrically connected to pin 7 of chip U1, while the negative terminal of capacitor C1 and the other end of capacitor C2 are both grounded.

5. The wireless charging transmitting circuit of a wearable device according to claim 4, wherein: It also includes a PCB board, with the charging time control circuit and the charging transmission circuit both located on the PCB board. The transmitting coil L1 is formed by etching on the PCB board.

6. The wireless charging transmitting circuit of a wearable device according to claim 1, wherein: It also includes a charging status indicator circuit, which comprises an NMOS transistor Q406, resistors R8 and R11, and a light-emitting diode LED2. The NMOS transistor Q406 is a CJBA3134K. The gate (G) of the NMOS transistor Q406 and one end of resistor R11 are both electrically connected to pin 5 of chip U2, and the drain (D) of the NMOS transistor Q406 and the other end of resistor R11 are both grounded. The cathode of the light-emitting diode LED2 is electrically connected to the source (S) of the NMOS transistor Q406. One end of resistor R8 is electrically connected to the anode of the light-emitting diode LED2, and the other end of resistor R8 is electrically connected to the power supply VCC.

7. The wireless charging transmitting circuit of a wearable device according to claim 6, wherein: It also includes a power status indicator circuit; the power status indicator circuit includes a resistor R7 and a light-emitting diode LED1; the negative terminal of the light-emitting diode LED1 is grounded; one end of the resistor R7 is electrically connected to the positive terminal of the light-emitting diode LED1, and the other end of the resistor R7 is electrically connected to the power supply VCC. 8.The wireless charging transmitting circuit of a wearable device of claim 7, wherein: The light-emitting color of LED2 is different from that of LED1.

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