A miniaturized wireless charging system for a smart ring

Abstract

The utility model discloses a miniaturized wireless charging system for intelligent ring, including TX charging cabin circuit and RX end ring wireless charging receiving circuit, this scheme mainly is adopt 280KHZ frequency's wireless charging scheme. The receiving end adopts FPC coil, makes the thinnest and half bridge rectification special wireless charging IC of coil. The transmitting end still adopts copper coil form, and the simple circuit of half bridge transmission. And with current decoding circuit, can realize the simple communication between ring and transmitter (realize charging, charge, overtemperature etc. Simple communication). Can satisfy small size wireless charging demand, high efficiency, low temperature, especially under such small volume can realize above functional cost performance is very high.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology for micro electronic devices, and in particular to a miniaturized wireless charging system for a smart ring. Background Technology

[0002] Analysis of existing smart ring charging solutions reveals the following defects: Standard Qi protocol chargers have large transmitting coil diameters that do not match the ring size, resulting in low coupling efficiency (<15%). Magnetic contact charging requires precise alignment, has poor waterproofing, and the contact metal is prone to oxidation. NFC wireless charging has low efficiency, with the ring surface temperature rising above 45°C during charging, causing discomfort when worn. Utility Model Content

[0003] The purpose of this invention is to provide a miniaturized wireless charging system for smart rings to solve the aforementioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A miniaturized wireless charging system for a smart ring includes a TX charging case circuit and an RX ring wireless charging receiver circuit.

[0006] In the TX charging case circuit, the USB 5V input charging section: external power is input through the USB1 interface, passing through the PTC1 fuse, ESD1 electrostatic tube, and the parallel resistor R12 and resistor R14. The voltage divider signal DCIN is connected to pin 7 of chip U3. This signal is used to detect whether external power is connected.

[0007] VIN passes through capacitor C11 and is connected to pin 4 of chip U4. Pin 3 of chip U4 passes through capacitor C10 and is connected to the positive terminal of the BAT battery. Pin 5 of chip U4 is connected to resistor R15. The resistance value of resistor R15 can be used to set the charging current. Pin 2 of chip U4 is connected to the negative terminal of the battery.

[0008] Boost section: Battery current is connected to capacitor C4, which is connected to pin 5 of chip U2. Through L1, it is connected to pin 1 of chip U2. Through diode D1, it outputs VCC. VCC is connected to capacitor C3. VCC passes through resistor R5 and resistor R6, which divide the voltage and connect to pin 3 of chip U2. Pin 4 of chip U2 is connected to the PW-EN signal and resistor R7 and pin 6 of chip U3. This signal is used to turn on the boost.

[0009] Hall effect section: VCC is connected to capacitor C1, VCC is connected to pin 1 of chip U1, signal HALL is connected to pin 3 of chip U1 and capacitor C2, HALL is connected to pin 8 of U3, and the HALL signal is used to activate the main control IC.

[0010] Coil drive section: VCC passes through transistors Q1 and Q3. The PMOS transistor is connected to pin 1 of both transistors Q1 and Q3. The PMOS transistor is also connected to resistor R8 and pin 2 of chip U3. Transistors Q1 and Q3 form a totem pole, enhancing the driving capability of the PMOS signal and reducing switching delay. VCC is connected to capacitor C6, then through L2 and CF1, CF2, then through transistor Q2 and diode D2, and finally through RCS2 to ground. The parallel resonance formed by CF1, CF2, and L2 converts electrical energy into a magnetic field. The OPIN is connected to RCS2 and pin 9 of U3.

[0011] Main control section: VCC connects to pin 16 of chip U3 and pin 12 of capacitor C5. Pin 15 of chip U3 is connected via resistors R9 and R11. Resistor R9 then connects to capacitor C7 and pin 12 of chip U3. Resistor R11 connects to capacitor C8 and pin 11 of chip U3. The decoding circuit formed by capacitors C7 and C8 is controlled by changes in the OPIN signal. BAT, via resistors R1 and R3, is a resistor-divided signal (VBAT) connected to pin 10 of chip U3 and capacitor C9. VBAT is used to detect battery voltage. The P1 programming port is used for programming software.

[0012] Indicator light section: VCC connects to LED1 via resistor R2, then to the LED1 signal, and finally to pin 14 of chip U3. VCC also connects to LED2 via resistor R4, then to the LED2 signal, and finally to pin 4 of chip U3. This section supports functions such as charging, full charge, battery compartment level monitoring, foreign object detection, etc.

[0013] In the RX end wireless charging receiver circuit, coil L3 is connected to pin 1 of chip U6 through C23 to ground. Pin 1 of coil L3 is connected to capacitor C21 to ground, and capacitors C21 and C23 form a series-parallel resonance. Pin 1 of coil L3 is connected to transistor Q1 to ground through capacitor C22. Pin 1 of transistor Q1 is connected to COMC and resistor R15. COMC is connected to an external MCU. Pin 7 of chip U6 is connected to C19 to output 5V. Pin 5 of chip U6 is connected to 5V. Pin 6 of chip U6 is connected to the CHG signal and then connected to the external MCU. Pin 8 of chip U6 is connected to C20 to ground.

[0014] Preferably, capacitor C22 and transistor Q1 are used to change the oscillation frequency of the entire receiving coil, thereby changing the amplitude of the transmission. We identify the command issued by RX by recognizing the change in amplitude.

[0015] Preferably, chip U1 is a Hall switch HS517L; chip U2 is a DC-DC IC ME2159; chip U3 is a wireless charging transmitter IC JDS9122; chip U4 is a charging management IC ME4084; and chip U6 is a wireless charging receiver IC JDS9001C.

[0016] Compared with existing technologies, this utility model has the following advantages: This solution mainly adopts a 280kHz frequency wireless charging scheme. The receiver uses an FPC coil, making the coil as thin as possible, and a dedicated wireless charging IC for half-bridge rectification. The transmitter still uses a copper coil, with a simple half-bridge transmission circuit. It also includes a current decoding circuit, enabling simple communication between the ring and the transmitter (realizing simple communication such as charging, fully charged, and over-temperature). It can meet the needs of small-sized wireless charging, with high efficiency and low temperature. Especially in such a small size, it achieves the above functions with extremely high cost performance. Attached Figure Description

[0017] Figure 1 This is the circuit diagram of the TX charging case of this utility model;

[0018] Figure 2 This is the circuit diagram of the wireless charging receiver for the RX end ring of this utility model;

[0019] Figure 3 for Figure 1 The circuit diagram of the boost converter section;

[0020] Figure 4 for Figure 1 Main control circuit diagram;

[0021] Figure 5 for Figure 1 Circuit diagram of the coil drive section;

[0022] Figure 6 for Figure 1 Circuit diagram of the indicator light section;

[0023] Figure 7 for Figure 1 Hall effect circuit diagram;

[0024] Figure 8 for Figure 1 The circuit diagram of the input charging section. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] A miniaturized wireless charging system for a smart ring includes a TX charging case circuit and an RX ring wireless charging receiver circuit.

[0027] In the TX charging case circuit, the USB 5V input charging section: external power is input through the USB1 interface, passing through the PTC1 fuse, ESD1 electrostatic tube, and the parallel resistor R12 and resistor R14. The voltage divider signal DCIN is connected to pin 7 of chip U3. This signal is used to detect whether external power is connected.

[0028] VIN passes through capacitor C11 and is connected to pin 4 of chip U4. Pin 3 of chip U4 passes through capacitor C10 and is connected to the positive terminal of the BAT battery. Pin 5 of chip U4 is connected to resistor R15. The resistance value of resistor R15 can be used to set the charging current. Pin 2 of chip U4 is connected to the negative terminal of the battery.

[0029] Boost section: Battery current is connected to capacitor C4, which is connected to pin 5 of chip U2. Through L1, it is connected to pin 1 of chip U2. Through diode D1, it outputs VCC. VCC is connected to capacitor C3. VCC passes through resistor R5 and resistor R6, which divide the voltage and connect to pin 3 of chip U2. Pin 4 of chip U2 is connected to the PW-EN signal and resistor R7 and pin 6 of chip U3. This signal is used to turn on the boost.

[0030] Hall effect section: VCC is connected to capacitor C1, VCC is connected to pin 1 of chip U1, signal HALL is connected to pin 3 of chip U1 and capacitor C2, HALL is connected to pin 8 of U3, and the HALL signal is used to activate the main control IC.

[0031] Coil drive section: VCC passes through transistors Q1 and Q3. The PMOS transistor is connected to pin 1 of both transistors Q1 and Q3. The PMOS transistor is also connected to resistor R8 and pin 2 of chip U3. Transistors Q1 and Q3 form a totem pole, enhancing the driving capability of the PMOS signal and reducing switching delay. VCC is connected to capacitor C6, then through L2, CF1, and CF2, then through transistor Q2 and diode D2, and finally through RCS2 to ground. The parallel resonance formed by CF1, CF2, and L2 converts electrical energy into a magnetic field. The OPIN is connected to RCS2 and pin 9 of chip U3.

[0032] Main control section: VCC connects to pin 16 of chip U3 and pin 12 of capacitor C5. Pin 15 of chip U3 is connected to resistors R9 and R11, then resistor R9 connects to capacitor C7 and pin 12 of chip U3. Resistor R11 connects to capacitor C8 and pin 11 of chip U3. The decoding circuit formed by capacitors C7 and C8 is controlled by changes in the OPIN signal. VBAT, a voltage divider signal from resistors R1 and R3, connects to pin 10 of chip U3 and capacitor C9. VBAT is used to detect battery voltage. The P1 programming port is used for programming software.

[0033] Indicator light section: VCC connects to LED1 via resistor R2, then to the LED1 signal, and finally to pin 14 of U3. VCC also connects to LED2 via resistor R4, then to the LED2 signal, and finally to pin 4 of chip U3. This section supports functions such as charging, full charge, battery compartment level monitoring, foreign object detection, etc.

[0034] In the RX end wireless charging receiver circuit, coil L3 is connected to pin 1 of chip U6 and then to ground via C23. Pin 1 of coil L3 is also connected to capacitor C21 and then to ground, forming a series-parallel resonance between capacitors C21 and C23. Pin 1 of coil L3 is connected to transistor Q1 and then to ground via capacitor C22. Pin 1 of transistor Q1 is connected to COMC and resistor R15. COMC is connected to an external MCU. Pin 7 of chip U6 is connected to C19 to output 5V. Pin 5 of chip U6 is connected to 5V. Pin 6 of chip U6 is connected to the CHG signal and then to the external MCU. Pin 8 of chip U6 is connected to C20 to ground.

[0035] Capacitor C22 and transistor Q1 are used to change the oscillation frequency of the entire receiving coil, thereby changing the amplitude of the transmission. We identify the command issued by RX by recognizing the change in amplitude.

[0036] Chip U1 is a Hall switch HS517L; chip U2 is a DC-DC IC ME2159; chip U3 is a wireless charging transmitter IC JDS9122; chip U4 is a charging management IC ME4084; and chip U6 is a wireless charging receiver IC JDS9001C.

[0037] Software implementation method: When DCIN is high, the USB charging of the battery compartment is detected, and the power indicator LED1 starts flashing slowly. When fully charged, LED1 remains constantly lit. When HALL is high, U3 enables U2, the boost converter operates, the PMOS is simultaneously turned on, and the coil drive circuit runs. If no charging code is received or no load is detected within 20 seconds, the IC enters sleep mode, shutting down the boost converter and PMOS. If a load and charging code are detected, the wireless charger will continue to operate and repeatedly scan for the charging code, with LED1 flashing slowly. Once a full charge code is detected, U3 immediately enters sleep mode.

[0038] The above description is a preferred embodiment of the present utility model. For those skilled in the art, any changes, modifications, substitutions and variations made to the implementation methods without departing from the principles and spirit of the present utility model, based on the teachings of the present utility model, still fall within the protection scope of the present utility model.

Claims

1. A miniaturized wireless charging system for a smart ring, characterized in that, This includes the TX charging case circuitry and the RX end ring wireless charging receiver circuitry. In the TX charging case circuit, the USB 5V input charging section: the external power supply is input through the USB1 interface, passes through the PTC1 fuse, the ESD1 electrostatic tube, and the parallel resistors R12 and R14 to divide the voltage signal DCIN, which is connected to pin 7 of the chip U3. This signal is used to detect whether the external power supply is connected. VIN passes through capacitor C11 and is connected to pin 4 of chip U4. Pin 3 of chip U4 passes through capacitor C10 and is connected to the positive terminal of the BAT battery. Pin 5 of chip U4 is connected to resistor R15. The resistance value of resistor R15 can be used to set the charging current. Pin 2 of chip U4 is connected to the negative terminal of the battery. Boost section: Battery current is connected to capacitor C4, which is connected to pin 5 of chip U2. Through L1, it is connected to pin 1 of chip U2. Through diode D1, it outputs VCC. VCC is connected to capacitor C3. VCC passes through resistor R5 and resistor R6, which divide the voltage and connect to pin 3 of chip U2. Pin 4 of chip U2 is connected to the PW-EN signal and resistor R7 and pin 6 of chip U3. This signal is used to turn on the boost. Hall effect section: VCC is connected to capacitor C1, VCC is connected to pin 1 of chip U1, signal HALL is connected to pin 3 of chip U1 and capacitor C2, HALL is connected to pin 8 of U3, and the HALL signal is used to activate the main control IC; Coil drive section: VCC passes through transistors Q1 and Q3. The PMOS is connected to pin 1 of transistors Q1 and Q3. The PMOS is connected to resistor R8 and pin 2 of chip U3. Transistors Q1 and Q3 form a totem pole to enhance the driving capability of the PMOS signal and reduce switching delay. VCC is connected to capacitor C6, passes through L2 and CF1 and CF2, then through transistor Q2 and diode D2, and finally through RCS2 to ground. The parallel resonance formed by CF1, CF2 and L2 converts electrical energy into a magnetic field. OPIN is connected to RCS2 and pin 9 of U3. Main control section: VCC connects to pin 16 of chip U3 and pin 12 of capacitor C5. Pin 15 of chip U3 is connected to resistors R9 and R11. Then, resistor R9 connects to capacitor C7 and pin 12 of chip U3. Resistor R11 connects to capacitor C8 and pin 11 of chip U3. The decoding circuit composed of capacitors C7 and C8 uses the change of OPIN signal to generate BAT, which is connected to pin 10 of chip U3 and capacitor C9 via the voltage divider signal VBAT from resistors R1 and R3. VBAT is used to detect battery voltage. P1 programming port is used to program software. Indicator light section: VCC is connected to LED1 via resistor R2, and the LED1 signal is connected to pin 14 of chip U3. VCC is connected to LED2 via resistor R4, and the LED2 signal is connected to pin 4 of chip U3. In the RX end wireless charging receiver circuit, coil L3 is connected to pin 1 of chip U6 and then to ground via C23. Pin 1 of coil L3 is also connected to capacitor C21 and then to ground, forming a series-parallel resonance between capacitors C21 and C23. Pin 1 of coil L3 is connected to transistor Q1 and then to ground via capacitor C22. Pin 1 of transistor Q1 is connected to COMC and resistor R15. COMC is connected to an external MCU. Pin 7 of chip U6 is connected to C19 to output 5V. Pin 5 of chip U6 is connected to 5V. Pin 6 of chip U6 is connected to the CHG signal and then to the external MCU. Pin 8 of chip U6 is connected to C20 to ground.

2. The miniaturized wireless charging system for a smart ring as described in claim 1, characterized in that, Capacitor C22 and transistor Q1 are used to change the oscillation frequency of the entire receiving coil, thereby changing the amplitude of the transmission. The command issued by RX is identified by recognizing the change in amplitude.

3. The miniaturized wireless charging system for a smart ring as described in claim 1, characterized in that, Chip U1 is a Hall switch HS517L; chip U2 is a DC-DC IC ME2159; chip U3 is a wireless charging transmitter IC JDS9122; chip U4 is a charging management IC ME4084; and chip U6 is a wireless charging receiver IC JDS9001C.

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