Miniature anti-drowning wearable device circuit

Abstract

The utility model discloses a miniature drowning prevention wearable device circuit, which relates to the field of drowning prevention wearable devices and comprises a wireless communication module, an ultra-low power consumption LDO (Low Dropout Regulator) chip, a capacitive sensor circuit, a lithium battery charging circuit, a miniature lithium battery interface, a miniature contact charging interface and a low power consumption detection and automatic prompt circuit. Compared with the scheme that multiple sensors are adopted in the prior art, only a capacitive sensor is adopted, the cost and the power consumption are lower, the size and the weight of the equipment are lighter, the circuit composition is simple, the integration degree is high, the wearable equipment is lighter, and the sports requirements of non-inductive wearing and comfortable swimming can be better met; by receiving and analyzing the electric quantity of the lithium battery collected by the wireless communication module and the output value of the capacitive sensor, the states of water outlet, water inlet, drowning, low electric quantity and the like of the equipment can be identified.

Description

Technical Field

[0001] The utility model belongs to the field of anti-drowning wearable equipment, and in particular relates to a miniature anti-drowning wearable equipment circuit. Background Art

[0002] Currently, most anti-drowning wearable devices detect drowning through sensors in the wearable devices, which are then fed back to the receiving control end through wireless communication for monitoring and identification, and an alarm is issued to alert lifeguards of the drowning situation.

[0003] The existing technology uses a variety of sensors for detection, such as pressure sensors, heart rate sensors and acceleration sensors to detect the swimmer's water entry depth, heart rate and movement speed. When these parameters are not within the system setting threshold, the receiving end will issue a drowning alarm, which will limit the wearer's swimming range and the system is prone to false alarms. The more sensors there are, the more complex and costly the circuits are, the greater the total power consumption will be, and in order to meet the battery life, the larger the capacity of the lithium battery required, the larger the size and weight of the wearable device, and the greater the swimmer's comfort. Some anti-drowning wearable devices also use water depth sensors, but most wireless communications can only communicate well in shallow water. When underwater, the wireless communication signal attenuation is large, and communication loss or data errors are prone to occur. It is not very meaningful for measuring water depth, and the water depth sensor also limits the swimming range to a certain extent.

[0004] At present, most anti-drowning wearable devices mainly consider the technical level of implementation. By stacking multiple modules and multiple sensors, their structure is complex, and there are problems such as high cost, high power consumption, short battery life and low integration. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model aims to provide a miniature anti-drowning wearable device circuit.

[0006] The technical solution adopted by the utility model is:

[0007] A circuit for a miniature wearable device for drowning prevention includes a wireless communication module, an ultra-low power consumption LDO chip, a capacitive sensor circuit, a lithium battery charging circuit, a miniature lithium battery interface, a miniature contact charging interface, and a low power consumption power detection and automatic prompt circuit; the wireless communication module is used for sending and receiving wireless signals and transmitting data; the ultra-low power consumption LDO chip is used for providing a stable power supply for each circuit in the system, and low power consumption prolongs the standby time of the device; the capacitive sensor circuit is used for identifying the entry of a swimmer into water; the lithium battery charging circuit is used for charging the lithium battery, and an integrated anti-reverse connection function is used to protect the safety of the device during charging connection.

[0008] Furthermore, the wireless communication module adopts a module integrating wireless transceiver and control and having a board-mounted PCB antenna.

[0009] Furthermore, the ultra-low power consumption LDO chip is a voltage stabilizing chip with low standby current.

[0010] Furthermore, the lithium battery charging circuit adopts a lithium battery charging chip with charging reverse connection protection.

[0011] Furthermore, the capacitive sensor circuit is a metal touch sensing pad PAD integrated on the PCB copper foil and closely attached to the touch panel of the device housing, and detects whether the touch panel touches the surface of an object by sensing changes in capacitance.

[0012] Furthermore, the micro-contact charging interface is two micro metal contacts, one connected to VCH and the other connected to GND, integrated on the PCB, and can be used with magnets for magnetic charging.

[0013] The beneficial effects of the utility model are:

[0014] The utility model provides a circuit for a miniature anti-drowning wearable device. Compared with the prior art solution that uses multiple sensors, the utility model only needs to use a capacitive sensor, which has lower cost and power consumption, lighter volume and weight of the device, simple circuit composition, and high integration, making the wearable device lighter and more able to meet the needs of comfortable swimming without feeling. By receiving and analyzing the lithium battery power collected by the wireless communication module and the output value of the capacitive sensor, it can be identified that the device is in the state of out of water, in water, drowning, low power, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the connection relationship of the circuit of the utility model.

[0016] Figure 2 This is the circuit diagram of the ultra-low power LDO chip.

[0017] Figure 3 It is a capacitive sensor circuit.

[0018] Figure 4 It is a lithium battery charging circuit.

[0019] Figure 5 It is a low power consumption power detection and automatic prompt circuit.

[0020] Figure 6 This is a schematic diagram of the structure on the back of the PCB board.

[0021] Figure 7 It is a structural diagram of the front side of the PCB board. DETAILED DESCRIPTION

[0022] In this embodiment, if Figures 1 to 7 As shown, a miniature anti-drowning wearable device circuit includes a wireless communication module, an ultra-low power consumption LDO chip, a capacitive sensor circuit, a lithium battery charging circuit, a miniature lithium battery interface, a miniature contact charging interface, and a low power consumption power detection and automatic prompt circuit; the wireless communication module is used to send and receive wireless signals and transmit data; the ultra-low power consumption LDO chip is used to provide a stable power supply for each circuit in the system, and low power consumption prolongs the standby time of the device; the capacitive sensor circuit is used to identify the water entry detection of the swimmer; the lithium battery charging circuit is used for lithium battery charging, and the integrated anti-reverse connection function protects the safety of the device during charging connection. The utility model can identify the device in the state of being out of water, entering water, drowning, low power, etc. by receiving and analyzing the lithium battery power collected by the wireless communication module and the output value of the capacitive sensor.

[0023] In this embodiment, if Figure 7 As shown, the wireless communication module uses a module that integrates wireless transceiver and control and has an onboard PCB antenna, which has high integration, small size and low power consumption.

[0024] In this embodiment, if Figure 2 As shown, ultra-low power consumption LDO chip: The power circuit of the system uses an ultra-low standby current voltage regulator chip to extend the standby time of the device. The VIN input terminal in the figure below is connected to the lithium battery VBAT, and the VOUT terminal outputs the VDO voltage to power the wireless communication module and the capacitive sensor module.

[0025] In this embodiment, if Figure 3 As shown in the capacitive sensor circuit, VDO in the figure below is the power supply voltage output by the lithium battery power supply after being stabilized by the LDO chip. The metal touch sensing pad PAD is integrated on the PCB copper foil and is close to the touch panel of the device shell. It detects whether the touch panel touches the surface of the object by sensing the change of capacitance. It is used to identify the water entry detection of the swimmer. When the water entry is detected, POUT outputs a signal to the wireless communication module.

[0026] In this embodiment, if Figure 4 As shown, the lithium battery charging circuit uses a lithium battery charging chip with charging reverse connection protection, which can prevent circuit failure caused by misoperation during charging connection, and add a layer of protection for the contact charging interface; the charging chip has extremely low battery leakage current, reduces battery power consumption, and extends the standby time of the device. D1 and D2 are bidirectional ESD chips, which are used for electrostatic protection during contact charging or hot plugging of battery connections. LED3 is a charging indicator light, which will light up during charging, and the charging chip will automatically turn off the light when the lithium battery is fully charged. The micro contact charging interface of the lithium battery charging circuit is two micro metal contacts, one connected to VCH and the other connected to GND, integrated on the PCB, and can be used with magnets for magnetic charging.

[0027] In this embodiment, if Figure 6 As shown, the low power consumption electric quantity detection and automatic prompting circuit comprises an electric quantity detection circuit and an electric quantity automatic prompting circuit.

[0028] Power detection circuit: Use a resistor divider circuit with large resistance and low power consumption (R10, R11), connect the input end to the lithium battery VBAT, and connect the divided output end ADC to the wireless communication module for data collection.

[0029] Automatic power prompt circuit: Q3 is a chip integrating dual-channel PMOS tubes, and the circuit is automatically controlled by POUT. Circuit principle: When the capacitive sensor circuit detects the surface of an object, it starts when POUT outputs a low level, and the No. 2 PMOS tube is turned on, that is, S2 and D2 are turned on. At this time, G1 will generate a voltage VG1 after VBAT is divided by R3 and R4. When the lithium battery power is lower, the VBAT voltage is smaller and VG1 will also become smaller. When VG1 is less than the voltage of VS1, the No. 1 PMOS tube is turned on, that is, S1 and D1 are turned on, and the VDO voltage passes through R2 to LED2, and the LED2 indicator light will light up to indicate low power. Beneficial effects of the circuit: The device is in the off state in the default standby state, reducing power consumption; when POUT outputs a low level, it starts, the lower the lithium battery power, the greater the degree of conduction of the No. 1 PMOS tube, and the brightness of the LED2 light will be brighter, so as to achieve the degree of graded low power prompt.

[0030] In this embodiment, if Figure 6 and Figure 7 As shown, the PCB adopts a double-sided layout and surface-mount micro components with high integration.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A miniature anti-drowning wearable device circuit, characterized in that: Including wireless communication module, ultra-low power consumption LDO chip, capacitive sensor circuit, lithium battery charging circuit, micro lithium battery interface, micro contact charging interface, low power consumption power detection and automatic prompt circuit; The wireless communication module is used to send and receive wireless signals and transmit data; The ultra-low power consumption LDO chip is used to provide a stable power supply for each circuit in the system, and the low power consumption prolongs the standby time of the equipment; The capacitive sensor circuit is used to detect the entry of a swimmer into water; The lithium battery charging circuit is used for charging lithium batteries, and has an integrated reverse connection protection function to protect the safety of the device during charging connection.

2. A miniature anti-drowning wearable device circuit according to claim 1, characterized in that: The wireless communication module is a module integrating wireless transceiver and control and having a PCB antenna on board.

3. A miniature anti-drowning wearable device circuit according to claim 1, characterized in that: The ultra-low power consumption LDO chip is a voltage stabilizing chip with low standby current.

4. A miniature anti-drowning wearable device circuit according to claim 1, characterized in that: The lithium battery charging circuit adopts a lithium battery charging chip with charging reverse connection protection.

5. The circuit of a miniature anti-drowning wearable device according to claim 1, characterized in that: The capacitive sensor circuit is a metal touch sensing pad PAD integrated on a PCB copper foil and close to the touch panel of the device housing. It detects whether the touch panel touches the surface of an object by sensing changes in capacitance.

6. A miniature anti-drowning wearable device circuit according to claim 1, characterized in that: The micro-contact charging interface is two micro-metal contacts, one connected to VCH and the other connected to GND, which are integrated on the PCB and can be used with magnets for magnetic charging.

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