Low-power-consumption on-bed and off-bed detection circuit and intelligent mattress

Abstract

The invention relates to the technical field of low-power-consumption detection, and discloses a low-power-consumption on-bed and off-bed detection circuit and an intelligent mattress. A passive vibration detection module without an external power supply is used for detecting a vibration signal, so that a power management module is triggered to enter a working state; the problem that in the prior art, a detection circuit continuously consumes electricity in a dormant state is solved, and dormant power consumption is effectively reduced. Meanwhile, through cooperative work of the weight detection module and the control module, the on-bed state and the off-bed state can be accurately judged, and the accuracy of state detection is improved; in addition, the circuit design does not need to introduce an extra special wake-up chip or a high-performance signal processing circuit, thereby avoiding the great increase of hardware cost, reducing the overall cost of equipment, and facilitating the large-scale deployment. Moreover, due to the characteristic of low power consumption, the endurance time of the equipment can be effectively prolonged, an effective solution is provided for the long endurance demand of the Internet of Things equipment such as an intelligent mattress, and the user experience and the market competitiveness of the equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-power detection, and in particular to a low-power out-of-bed detection circuit and an intelligent mattress. BACKGROUND

[0002] With the wide application of Internet of Things technology, the devices powered by batteries, represented by intelligent mattresses, are facing the core pain point of long endurance demand in the industry.

[0003] At present, most of the intelligent mattresses and other devices adopt a "sleep-wake" cycle mode to save power consumption. During sleep, most of the functional modules such as CPU and radio frequency communication module are turned off, and only a small amount of circuits such as real-time clock RTC and signal detection circuit are powered on. However, in this state, in order to receive the wake-up signal, the device needs to keep the detection circuit in standby state, which makes it impossible to further reduce the sleep power consumption. Moreover, it also affects the accuracy of wake-up, because the traditional wake-up signal lacks a verification mechanism, and attackers can fake the wake-up command to force the device to start frequently, causing false wake-up and consuming power.

[0004] In addition, in order to balance the response speed and power consumption, the existing scheme usually adopts the way of timing wake-up, such as waking up to check the signal once every 10 seconds. However, this method has disadvantages: if the sleep interval is long, the response delay will be high, affecting the user experience; if the sleep interval is short, frequent wake-up will cause a sharp increase in power consumption. Some existing solutions introduce special wake-up chips, such as low-power microcontrollers MCU or high-performance signal processing circuits, to reduce sleep power consumption. Although it can reduce the sleep power consumption to 10-20 μA, the hardware cost is increased by 30%-50%, which is not conducive to the large-scale deployment of low-cost Internet of Things devices (such as sensors in intelligent mattresses). Moreover, in the long run, 10-20 μA of sleep power consumption plus the self-discharge of the battery will have a great impact on the endurance of the device.

[0005] Therefore, it is necessary to improve the prior art.

[0006] The above information is given as background information only to assist with an understanding of the present application, and does not constitute a admission that any of the above information is used as prior art with respect to the present application. SUMMARY

[0007] The present application provides a low-power out-of-bed detection circuit and an intelligent mattress to solve the problems of high power consumption, inaccurate wake-up and high hardware cost of intelligent mattresses and other devices in the prior art.

[0008] To achieve the above purpose, the present application provides the following technical solutions:

[0009] In a first aspect, the present application provides a low-power bed exit detection circuit, comprising a passive vibration detection module, a power management module, a weight detection module and a control module; wherein,

[0010] The passive vibration detection module is connected with the power management module, for detecting vibration and generating an electrical signal to trigger the power management module to enter a working state;

[0011] The power management module is connected with the control module and the weight detection module, for outputting a working voltage to the control module and the weight detection module after entering the working state;

[0012] The weight detection module is connected with the control module, for detecting weight and generating weight data;

[0013] The control module is used for detecting whether it is in a bed state or a bed exit state according to the weight data.

[0014] Further, in the low-power bed exit detection circuit, the control module is further used for triggering the power management module to exit the working state when detecting that it is in the bed exit state.

[0015] Further, in the low-power bed exit detection circuit, the passive vibration detection module comprises a passive vibration sensor and a switch tube Q1;

[0016] The passive vibration sensor is connected with the switch tube Q1, for detecting vibration and generating an electrical signal;

[0017] The switch tube Q1 is connected with the power management module, for turning on after receiving the electrical signal to trigger the power management module to enter the working state.

[0018] Further, in the low-power bed exit detection circuit, the passive vibration sensor is connected with the gate of the switch tube Q1;

[0019] The drain of the switch tube Q1 is connected with a power supply;

[0020] The source of the switch tube Q1 is grounded and connected with the power management module.

[0021] Further, in the low-power bed exit detection circuit, the passive vibration detection module further comprises an interface J1, an electrostatic protection diode ESD1, a first capacitor C1, a first resistor R1 and a second resistor R2;

[0022] The gate of the switch tube Q1 is connected with the interface J1, thereby being connected with the passive vibration sensor;

[0023] The drain of the switching transistor Q1 is connected to the first resistor R1, thereby connecting it to the power supply.

[0024] The source of the switching transistor Q1 is connected to the first capacitor C1, thereby grounding it;

[0025] The negative terminal of the electrostatic discharge protection diode ESD1 is connected to the gate of the switching transistor Q1, and the positive terminal of the electrostatic discharge protection diode ESD1 is grounded.

[0026] One end of the second resistor R2 is connected to the gate of the switch Q1, and the other end of the second resistor R2 is grounded.

[0027] Furthermore, in the bed-off detection circuit, the low power consumption includes a power management module comprising a voltage regulator chip U1;

[0028] The EN pin of the voltage regulator chip U1 is connected to the source of the switching transistor Q1;

[0029] The Vout pin of the voltage regulator chip U1 is connected to the control module and the weight detection module, respectively.

[0030] Furthermore, in the bed-off detection circuit, the power management module also includes a sixth resistor R6, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4;

[0031] One end of the sixth resistor R6 is connected to the EN pin of the voltage regulator chip U1, and the other end of the sixth resistor R6 is grounded.

[0032] One end of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are respectively connected to the Vout pin of the voltage regulator chip U1, and the other end of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are respectively grounded.

[0033] Furthermore, in the bed-off detection circuit, the control module includes a control chip U2;

[0034] The VCC pin of the control chip U2 is connected to the Vout pin of the voltage regulator chip U1;

[0035] The PD4 and PD7 pins of the control chip U2 are respectively connected to the weight detection module.

[0036] Furthermore, in the low-power off-bed detection circuit, the control module also includes a Zener diode ZD1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;

[0037] The PB7 pin of the control chip U2 is connected to the fourth resistor R4 and the third resistor R3 in sequence, thereby connecting to the EN pin of the voltage regulator chip U1.

[0038] One end of the fifth resistor R5 is connected to a 3.3V power supply, and the other end of the fifth resistor R5 is connected between the fourth resistor R4 and the third resistor R3.

[0039] The negative terminal of the Zener diode ZD1 is connected between the fourth resistor R4 and the third resistor R3, and the positive terminal of the Zener diode ZD1 is grounded.

[0040] In a second aspect, the present invention provides a smart mattress, including a low-power bed-off detection circuit as described in the first aspect above.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] This invention provides a low-power bed-off detection circuit and a smart mattress. Through an innovative combination of a passive vibration detection module, a power management module, a weight detection module, and a control module, it achieves significant energy savings and efficient detection functionality. The passive vibration detection module can detect vibration signals without an external power source, triggering the power management module to enter working mode. This avoids the problem of continuous power consumption by the detection circuit in sleep mode in traditional technologies, effectively reducing sleep power consumption. Simultaneously, the collaborative work of the weight detection module and the control module accurately determines the bed-on and bed-off states, improving the accuracy of status detection. Furthermore, this circuit design eliminates the need for additional dedicated wake-up chips or high-performance signal processing circuits, avoiding a significant increase in hardware costs and reducing the overall cost of the device, which is beneficial for large-scale deployment. Moreover, due to its low power consumption, it effectively extends the device's battery life, solving the battery life problems caused by sleep power consumption and battery self-discharge in existing technologies. This provides an effective solution for the long battery life requirements of IoT devices such as smart mattresses, enhancing user experience and the device's market competitiveness.

[0043] The present invention has other features and advantages, which will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a functional module diagram of the low-power bed-off detection circuit provided in Embodiment 1 of the present invention;

[0046] Figure 2 This is a schematic diagram of the circuit principle of the passive vibration detection module provided in Embodiment 1 of the present invention;

[0047] Figure 3 This is a schematic diagram of the circuit principle of the power management module provided in Embodiment 1 of the present invention;

[0048] Figure 4 This is a schematic diagram of the circuit principle of the control module provided in Embodiment 1 of the present invention.

[0049] Figure label:

[0050] Passive vibration detection module 1, power management module 2, weight detection module 3, control module 4;

[0051] Passive vibration sensor 11. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1

[0054] Please refer to Figure 1 Embodiment 1 of the present invention provides a low-power bed-off detection circuit, including a passive vibration detection module 1, a power management module 2, a weight detection module 3, and a control module 4; wherein,

[0055] The passive vibration detection module 1 is connected to the power management module 2. The main function of the passive vibration detection module 1 is that, thanks to its unique passive characteristics, it can accurately detect vibrations transmitted to it without an external power supply. Once vibration is detected, the module can quickly generate a corresponding electrical signal. This electrical signal serves as a trigger signal, prompting the power management module 2 to enter the working state from its sleep state, providing the basic conditions for the normal operation of subsequent circuits.

[0056] The power management module 2 is connected to the control module 4 and the weight detection module 3 in the circuit. When the power management module 2 is triggered by the passive vibration detection module 1, it will stably output a suitable working voltage according to preset parameters and logic, providing reliable power support for the control module 4 and the weight detection module 3, ensuring that these two modules can carry out their respective detection tasks normally.

[0057] The weight detection module 3 and the control module 4 are interconnected, forming an organic whole. The weight detection module 3 utilizes advanced detection technology and precise sensors to perform real-time and accurate detection of the weight acting upon it, and converts the detected weight information into corresponding weight data. This weight data is then transmitted to the control module 4, providing crucial information for subsequent status judgments.

[0058] The control module 4, as the core control unit of the entire circuit, undertakes important data processing and status judgment tasks. It receives weight data from the weight detection module 3 and uses pre-set algorithms and logic to perform in-depth analysis and processing of this data. By comparing it with a preset weight threshold range, the control module 4 can accurately determine whether the user is currently in bed or out of bed, and outputs the judgment result in the form of corresponding signals or data, providing support for subsequent equipment control or information feedback.

[0059] It is understandable that the "in-bed state" mentioned above refers to the state in which the user is actually on the bed, at which time the user's body is in full contact with the mattress, and the weight detection module 3 can detect the weight applied by the user's body to the mattress; while the "out-of-bed state" refers to the state in which the user leaves the mattress and is no longer on the bed, at which time the weight value detected by the weight detection module 3 will be close to the weight of the mattress itself or zero (depending on the installation method of the weight detection module 3).

[0060] The low-power off-bed detection circuit proposed in this invention achieves significant improvements in energy saving and detection functionality through an innovative combination of a passive vibration detection module 1, a power management module 2, a weight detection module 3, and a control module 4. Specifically, the passive vibration detection module 1, with its unique advantage of requiring no external power supply, can stably and reliably detect vibration signals in various complex environments. Once vibration is detected, the power management module 2 is quickly triggered to enter the working state. This design cleverly avoids the problem of continuous power consumption by the detection circuit in the sleep state in traditional technologies, effectively reducing the power consumption of the entire circuit during the sleep period and laying a solid foundation for extending the equipment's battery life.

[0061] Meanwhile, the collaborative working mechanism between the weight detection module 3 and the control module 4 further enhances the accuracy and reliability of status detection. The weight detection module 3 can acquire weight data in real time and accurately, while the control module 4, with its powerful data processing capabilities, performs detailed analysis of this data to accurately determine the in-bed and out-of-bed status. This precise status judgment capability not only provides users with more accurate and reliable information feedback but also provides strong support for subsequent equipment control and management.

[0062] Furthermore, this circuit design offers significant advantages in cost control. The control module 4 does not employ a dedicated, high-cost chip; instead, a standard control chip suffices. It can even utilize existing ZigBee or Bluetooth modules found in IoT devices like smart mattresses. With appropriate secondary development, their existing control functions can be reused to perfectly adapt to the circuit's requirements. This design approach, by eliminating the need for dedicated wake-up chips or high-performance signal processing circuits, effectively avoids a substantial increase in hardware costs, reducing the overall manufacturing cost of the device and facilitating the large-scale deployment and application of this technology in IoT devices such as smart mattresses.

[0063] Furthermore, due to its significant low power consumption, this circuit effectively extends the device's battery life in practical applications. This feature successfully solves the battery life problems caused by factors such as sleep power consumption and battery self-discharge in existing technologies, providing a practical and effective solution to the urgent need for long battery life in IoT devices such as smart mattresses. This not only improves the convenience and comfort of users during use but also significantly enhances the device's competitiveness in the market, providing strong support for the promotion and popularization of related products.

[0064] In one embodiment of this invention, in addition to the aforementioned data processing and status judgment functions, the control module 4 also possesses an important intelligent control capability: when it detects that the user is currently in an unoccupied state, it can actively trigger the power management module 2 to exit its current operating state. This design mechanism has significant energy-saving implications. When the user leaves the bed, the circuit does not need to continuously maintain a high-power operating mode. Through the precise judgment and timely control of the control module 4, the power management module 2 can quickly switch to a low-power sleep state, thereby effectively reducing unnecessary power consumption, further extending the overall battery life of the device, and improving energy efficiency.

[0065] Further understanding reveals that when the control module 4, with its precise detection algorithm and reliable data analysis capabilities, clearly determines that the user is currently in an unoccupied state, its functional expandability is also reflected in its ability to intelligently shut down the smart mattress and other associated devices or functions. For example, it can send a shutdown command to the bedside lamp, turning off the lamp that was originally turned on for the user's nighttime activities, thus avoiding energy waste. Simultaneously, for the massage function of the mattress, the control module 4 can also promptly send a stop signal to terminate the operation of the massage motor, saving energy, preventing unnecessary wear and tear on the device when unoccupied, and extending the lifespan of related components.

[0066] Conversely, if the control module 4 determines that the user is currently in bed, it will activate a series of matching components and functions according to preset programs and logic to ensure that the smart mattress provides comprehensive and considerate services. For example, when the user is lying in bed, the control module 4 will quickly activate the human vital signs sensors. These sensors can monitor the user's heart rate, respiratory rate, and other important physiological indicators in real time and transmit this data to relevant processing units or cloud servers for in-depth analysis and storage. Through continuous monitoring and analysis of this human vital signs data, not only can personalized health management suggestions be provided to the user, but timely warnings can also be issued in case of abnormalities, ensuring the user's health and safety. This allows the smart mattress to truly achieve an intelligent and humanized normal working mode, bringing users a higher quality and more convenient user experience.

[0067] Please refer to Figure 2 In one embodiment of this invention, the passive vibration detection module 1 includes a passive vibration sensor 11 and a switching transistor Q1.

[0068] The passive vibration sensor 11 is connected to the switching transistor Q1. In practical applications, the passive vibration sensor 11 can be implemented as a piezoelectric ceramic sheet. Due to its unique piezoelectric effect, the piezoelectric ceramic sheet can generate corresponding electrical signals when subjected to vibration, possessing advantages such as high sensitivity and reliability. These electrical signals provide crucial information for subsequent circuit triggering.

[0069] The switching transistor Q1 is connected to the power management module 2 in the circuit. Switching transistor Q1 possesses unique electrical characteristics, enabling it to switch between on and off states under specific conditions. When switching transistor Q1 receives an electrical signal from the passive vibration sensor 11, its internal electrical parameters change, causing it to rapidly transition from the off state to the on state. Once switching transistor Q1 is on, a low-impedance path is formed in the circuit, providing a trigger signal to the power management module 2. Upon detecting this trigger signal, the power management module 2, according to a preset program and logic, transitions from a sleep state to an operating state, providing necessary power support and management functions for the normal operation of the entire circuit.

[0070] Through this ingenious design, the passive vibration detection module 1 achieves accurate vibration detection and intelligent triggering of subsequent circuits. The high sensitivity of the passive vibration sensor 11 ensures that even weak vibrations can be captured promptly, while the fast turn-on characteristic of the switching transistor Q1 guarantees that the power management module 2 can be quickly triggered to enter the working state after vibration is detected, avoiding the delay problems that may exist in traditional technologies and improving the response speed and reliability of the entire circuit. This design not only has significant advantages in energy saving, but also provides a solid foundation for the implementation of subsequent circuit functions, providing an efficient and reliable solution for the bed-off detection function of IoT devices such as smart mattresses.

[0071] Please refer to this again. Figure 2 In one embodiment of this invention, the internal component connections of the passive vibration detection module 1 are meticulously designed, wherein the passive vibration sensor 11 is connected to the gate of the switching transistor Q1. Due to its unique physical characteristics (such as the piezoelectric effect of the piezoelectric ceramic sheet), the passive vibration sensor 11 converts mechanical vibration energy into an electrical signal when it detects external vibration. This electrical signal is precisely applied to the gate of the switching transistor Q1, which, as the control terminal of Q1, has its potential change directly determining the on / off state of Q1. Through this connection, the passive vibration sensor 11 can effectively transmit the detected vibration information to the switching transistor Q1 in the form of an electrical signal, achieving precise control of the operating state of the switching transistor Q1.

[0072] The drain of the switching transistor Q1 is reliably connected to the power supply. The power supply provides a stable operating voltage and current for the entire circuit, serving as the power source for its normal operation. The connection between the drain of switching transistor Q1 and the power supply ensures that when Q1 is turned on, a path for subsequent circuits (such as power management module 2) to obtain power from the power supply is established, guaranteeing a sufficient power supply for these circuits when needed. This connection method provides a fundamental guarantee for the circuit's energy transfer, ensuring stable operation under different operating conditions.

[0073] The source of the switching transistor Q1 is grounded and connected to the power management module 2. This grounding design plays a crucial role in stabilizing the circuit potential and providing a reference potential. It provides a zero-potential reference point for the entire circuit, allowing other components to operate accurately based on this reference potential. Simultaneously, the connection between the source and the power management module 2 forms a complete signal transmission and energy control link. When the passive vibration sensor 11 detects vibration and turns on the switching transistor Q1, the power supply provides power to the power management module 2 through the drain-source path, triggering the power management module 2 to enter its operating state. This design cleverly achieves intelligent control of the power management module 2's operating state based on vibration conditions, effectively reducing power consumption in the sleep state and improving the overall energy efficiency and reliability of the circuit.

[0074] In summary, by connecting the passive vibration sensor 11 to the gate of the switching transistor Q1, connecting the drain of the switching transistor Q1 to the power supply, and grounding the source and connecting it to the power management module 2, a highly efficient, reliable, and low-power passive vibration detection circuit structure is constructed.

[0075] Please refer to this again. Figure 2 In one embodiment of this invention, the passive vibration detection module 1, in addition to the core passive vibration sensor 11 and the switching transistor Q1, is also equipped with an interface J1, an electrostatic discharge protection diode ESD1, a first capacitor C1, a first resistor R1, and a second resistor R2. These components cooperate to form a stable, reliable circuit system with a comprehensive protection mechanism.

[0076] The gate of the switching transistor Q1 is connected to the passive vibration sensor 11 via interface J1. Interface J1 acts as a bridge, providing a standardized electrical connection port between the passive vibration sensor 11 and the switching transistor Q1. This design allows the passive vibration sensor 11 to be easily assembled and disassembled with the circuit, facilitating subsequent maintenance and replacement. Simultaneously, interface J1 ensures the stability and reliability of signal transmission, reducing signal interference or loss caused by poor connections, and guaranteeing that the vibration signal detected by the passive vibration sensor 11 is accurately transmitted to the gate of the switching transistor Q1.

[0077] The drain of the switching transistor Q1 is connected to the first resistor R1, which in turn connects to the power supply. The first resistor R1 primarily functions as a current limiter in the circuit. When the switching transistor Q1 is turned on, the power supply powers subsequent circuits (such as power management module 2) through Q1. The first resistor R1 limits the current flowing through Q1, preventing damage to Q1 or other circuit components due to excessive current. It acts like a "safety valve," ensuring that the current remains within a safe range during normal operation, thus improving the stability and reliability of the circuit.

[0078] The source of the switching transistor Q1 is connected to ground via the first capacitor C1. The first capacitor C1 serves to filter and stabilize the voltage in the circuit. During circuit operation, high-frequency noise signals may be generated due to various reasons. If these noise signals are superimposed on the power supply voltage, they will affect the normal operation of the circuit. The first capacitor C1 can filter these high-frequency noise signals and bypass them to ground, thereby ensuring the stability of the power supply voltage. Simultaneously, at the instants when the switching transistor Q1 is turned on and off, the first capacitor C1 also acts as a buffer, reducing the impact of voltage surges on the circuit and further improving the reliability of the circuit.

[0079] The negative terminal of the ESD protection diode ESD1 is connected to the gate of the switching transistor Q1, while the positive terminal is grounded. Static electricity (ESD) is a significant concern during the use of electronic equipment; the instantaneous high voltage generated by ESD can severely damage sensitive components in the circuit. The function of the ESD protection diode ESD1 is to provide ESD protection for the gate of the switching transistor Q1. When ESD is generated, the ESD protection diode ESD1 quickly conducts, diverting the static charge to ground, thereby preventing the ESD voltage from impacting the gate of the switching transistor Q1. This protects Q1 from ESD damage, extends the component's lifespan, and improves the overall circuit's anti-static capability.

[0080] One end of the second resistor R2 is connected to the gate of the switching transistor Q1, and the other end is grounded. The second resistor R2 primarily functions as a pull-down resistor in the circuit. When the switching transistor Q1 is not operating, i.e., when there is no vibration signal input, the second resistor R2 pulls the gate potential of Q1 down to near ground potential, ensuring that Q1 is reliably in a cutoff state. This prevents the gate potential of Q1 from abnormally rising due to external interference or other factors, thus avoiding unnecessary power consumption and circuit malfunctions, and improving the stability and reliability of the circuit.

[0081] In summary, through the ingenious connection and coordinated operation of interface J1, electrostatic protection diode ESD1, first capacitor C1, first resistor R1 and second resistor R2 with passive vibration sensor 11 and switching transistor Q1, passive vibration detection module 1 forms a circuit system with complete functions, stable performance and good protection mechanism.

[0082] Please refer to Figure 3 In one embodiment of this example, the power management module 2 includes a voltage regulator chip U1;

[0083] The voltage regulator chip U1 has the ability to stabilize the output voltage, which can provide stable and reliable power support for the subsequent connected circuit modules, ensuring that each module operates stably within the normal operating voltage range and avoiding problems such as performance instability or damage caused by voltage fluctuations.

[0084] Specifically, the EN pin (enable pin) of the voltage regulator chip U1 is electrically connected to the source of the switching transistor Q1. The EN pin serves as the control port of the voltage regulator chip U1, and its level directly determines whether the voltage regulator chip U1 enters the operating state. When the switching transistor Q1 is turned on based on the vibration signal detected by the passive vibration sensor 11, the potential at the source of the switching transistor Q1 changes. This change signal is transmitted to the EN pin of the voltage regulator chip U1, triggering the voltage regulator chip U1 to quickly switch from the sleep state to the operating state. At this time, the voltage regulator chip U1 begins to regulate the input voltage, providing a stable output voltage for subsequent circuits. Conversely, when the switching transistor Q1 is turned off, the EN pin potential returns to its initial state, and the voltage regulator chip U1 enters a low-power sleep mode, effectively reducing the power consumption of the entire circuit and improving energy efficiency.

[0085] Meanwhile, the Vout pin (output pin) of the voltage regulator chip U1 is connected to both the control module 4 and the weight detection module 3. The Vout pin is a crucial port for the voltage regulator chip U1 to output a stable voltage. The stable voltage processed by the voltage regulator chip U1 is transmitted to the control module 4 and the weight detection module 3 through this pin. The control module 4, as the core control unit, requires a stable voltage supply to ensure the normal operation of its internal microprocessor, interface circuits, etc., thereby enabling data processing and status judgment functions. The weight detection module 3 is responsible for real-time detection of weight changes on the mattress. Its internal sensors and signal processing circuits also rely on a stable voltage to ensure the accuracy and reliability of the detection data. By providing a stable voltage to these two important modules through the Vout pin of the voltage regulator chip U1, the stable operation of the smart mattress system in key functions such as bed exit detection and weight monitoring is effectively guaranteed, improving the overall system performance and user experience.

[0086] In summary, through the ingenious connection and collaborative work between the voltage regulator chip U1, the switching transistor Q1, the control module 4, and the weight detection module 3, the power management module 2 constructs an efficient, stable, and low-power power supply system, providing a solid power guarantee for the realization of various functions of the smart mattress, demonstrating the scientific and rational nature of the circuit design in this embodiment.

[0087] Please refer to this again. Figure 3 In one embodiment of this invention, the power management module 2 further includes a sixth resistor R6, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4; these components cooperate with the voltage regulator chip U1 to jointly construct a stable and reliable power management system.

[0088] One end of the sixth resistor R6 is connected to the EN pin (enable pin) of the voltage regulator chip U1, and the other end is grounded. In the circuit design, the EN pin is a key port controlling the operating state of the voltage regulator chip U1; its level directly determines whether the voltage regulator chip U1 is in normal operating mode or low-power sleep mode. The sixth resistor R6 plays an important role as a pull-down resistor here. When no external signal is applied to the EN pin, that is, when the switching transistor Q1 is in the off state, the sixth resistor R6 can reliably pull the potential of the EN pin down to near ground. This pull-down effect ensures that the voltage regulator chip U1 can stably remain in sleep mode when there is no trigger signal, avoiding the voltage regulator chip U1 from being falsely activated due to abnormal rise in the EN pin potential caused by external interference or other factors, thereby effectively reducing the static power consumption of the circuit and improving energy utilization efficiency. At the same time, the resistance value of the sixth resistor R6 is carefully selected to ensure that it provides sufficient pull-down capability without having too much impact on the normal trigger signal of the EN pin, so as to ensure the stability and reliability of the circuit.

[0089] One end of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are connected to the Vout pin (output pin) of the voltage regulator chip U1, while the other ends are independently grounded. The Vout pin is a key port for the voltage regulator chip U1 to output a stable voltage. The voltage after regulation provides power to the subsequent control module 4 and weight detection module 3 through this pin. However, in actual circuit operation, due to various factors such as power supply fluctuations, load changes, and high-frequency noise in the circuit, ripple and noise may appear in the output voltage. The parallel connection of these three capacitors is precisely to effectively solve this problem.

[0090] The second capacitor C2, the third capacitor C3, and the fourth capacitor C4 work together in the circuit to play a crucial role in filtering and stabilizing the voltage. Capacitors of different values ​​have different filtering characteristics, and their combined use can cover a wider frequency range. Larger capacitors (i.e., those with relatively larger capacitance) can effectively filter low-frequency ripple, smoothing out low-frequency voltage fluctuations; while smaller capacitors (i.e., those with relatively smaller capacitance) have a better filtering effect on high-frequency noise, quickly absorbing and releasing high-frequency charges and suppressing high-frequency noise interference. This parallel filtering method significantly reduces output voltage ripple and noise, providing a more stable and clean voltage for subsequent circuits, ensuring the normal and stable operation of control module 4 and weight detection module 3, and improving the performance and reliability of the entire smart mattress system.

[0091] In summary, through the ingenious connection of the sixth resistor R6 to the EN pin of the voltage regulator chip U1, and the parallel connection of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 to the Vout pin of the voltage regulator chip U1, the power management module 2 constructs a fully functional and stable power supply and regulation system. The reasonable configuration and coordinated operation of these components not only effectively reduces the circuit's power consumption but also significantly improves the stability and purity of the output voltage.

[0092] Please refer to Figure 4 In one embodiment of this example, the control module 4 includes a control chip U2;

[0093] The VCC pin of control chip U2 is connected to the Vout pin of voltage regulator chip U1 in power management module 2. The VCC pin serves as the power input port for control chip U2, and the stability and purity of its voltage directly affect the normal operation of control chip U2. Voltage regulator chip U1 is carefully designed and optimized to efficiently regulate the input voltage, outputting a stable and low-noise voltage. By connecting the VCC pin of control chip U2 to the Vout pin of voltage regulator chip U1, it is ensured that control chip U2 can operate under a stable and reliable power supply. A stable voltage effectively avoids abnormal operation of control chip U2 caused by power fluctuations, such as program crashes and data loss, thereby improving the stability and reliability of the entire smart mattress system. Simultaneously, the low-noise power supply provides a good working environment for the precision circuits and sensitive components inside control chip U2, contributing to improved performance and accuracy.

[0094] Pins PD4 and PD7 of the control chip U2 are connected to the weight detection module 3. These two pins serve as the key channels for data interaction and communication between the control chip U2 and the weight detection module 3, playing a crucial role. The weight detection module 3 is responsible for real-time and accurate detection of weight changes on the mattress, and it typically contains high-precision sensors and signal processing circuits. The sensors convert the detected weight information into electrical signals, which are then amplified, filtered, and processed by the signal processing circuit before being transmitted to the control chip U2 through a specific interface.

[0095] During communication between the control chip U2 and the weight detection module 3, pins PD4 and PD7 can utilize specific communication protocols (such as I2C, SPI, etc.) or analog signal transmission methods to achieve data exchange. For example, if a digital communication protocol is used, pins PD4 and PD7 can serve as data transmission lines (such as SDA and SCL) and clock signal lines, respectively, for synchronously transmitting weight data between the control chip U2 and the weight detection module 3. The control chip U2 sends control commands to the weight detection module 3 through these pins, such as initiating detection and adjusting detection accuracy, while simultaneously receiving real-time weight data from the weight detection module 3. By analyzing and processing this data, the control chip U2 can accurately determine whether there is a person on the mattress and the changes in the person's weight, thereby providing data support for other functions of the smart mattress (such as bed exit detection and sleep monitoring).

[0096] In summary, by connecting the VCC pin of control chip U2 to the Vout pin of voltage regulator chip U1, and by connecting the PD4 and PD7 pins to the weight detection module 3, control module 4 establishes an efficient and stable data processing and control platform. Under a stable power supply, control chip U2 can accurately and reliably interact with the weight detection module 3.

[0097] Please refer to this again. Figure 4 In one embodiment of this invention, the control module 4, based on the control chip U2, cleverly adds key components such as a Zener diode ZD1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The rational configuration and coordinated operation of these components greatly enriches the functionality of the control module 4 and improves the performance of the entire smart mattress system in terms of power consumption control and circuit stability.

[0098] The PB7 pin of control chip U2 is connected in series with the fourth resistor R4 and the third resistor R3, and then connected to the EN pin (enable pin) of voltage regulator chip U1 in power management module 2. This enables control module 4 to precisely control the operating state of voltage regulator chip U1 under specific conditions. Specifically, when control module 4 detects that the user is in an off-bed state through weight detection module 3, control chip U2 outputs a corresponding control signal through the PB7 pin. This signal, after being divided by the fourth resistor R4 and the third resistor R3, is applied to the EN pin of voltage regulator chip U1, pulling its potential low. Since the EN pin is the key port for controlling the operating state of voltage regulator chip U1, when its potential is pulled low, voltage regulator chip U1 quickly switches from normal operating mode to low-power sleep mode, thereby shutting off its output voltage. This design allows the smart mattress system to automatically enter the lowest power consumption state when no one is using it, effectively reducing energy consumption, extending battery life, and meeting the energy-saving and environmental protection requirements of modern electronic products.

[0099] One end of the fifth resistor R5 is tightly connected to a stable 3.3V power supply, while the other end is connected to the node between the fourth resistor R4 and the third resistor R3. The pull-up resistor provides a stable reference potential for the circuit, ensuring that this node remains at a defined high level when no external control signal is applied to the PB7 pin. Thus, when the control module 4 does not detect the bed-off state, the EN pin of the voltage regulator chip U1 can obtain a sufficient high-level signal through the fifth resistor R5, allowing the voltage regulator chip U1 to stably operate in normal working mode and continuously provide a stable power output to the subsequent control module 4, weight detection module 3, etc. At the same time, the resistance value of the fifth resistor R5 is carefully selected to ensure sufficient pull-up current without excessively affecting the overall power consumption of the circuit, achieving a balance between performance and power consumption.

[0100] Zener diode ZD1 plays a crucial role in voltage regulation and protection in the circuit due to its unique electrical characteristics. Its negative terminal is connected to the node between resistors R4 and R3, while its positive terminal is grounded. Zener diode ZD1 has a specific reverse breakdown voltage. When the reverse voltage applied across it exceeds this breakdown voltage, Zener diode ZD1 enters reverse breakdown mode. At this point, the voltage across its terminals remains relatively stable and no longer changes significantly with further increases in the reverse voltage. In this circuit, the main function of Zener diode ZD1 is to protect subsequent circuitry from voltage fluctuations and voltage spikes. When an abnormal increase in voltage occurs at the node between resistors R4 and R3 due to some reason (such as power supply fluctuations or external interference), Zener diode ZD1 quickly enters reverse breakdown mode, clamping the excess voltage near its breakdown voltage. This ensures that other components connected to this node (such as the EN pin of the Zener chip U1) are not damaged by excessive voltage. This protection mechanism effectively improves the stability and reliability of the entire circuit and extends the lifespan of electronic components.

[0101] In summary, by connecting the PB7 pin of control chip U2 in series with the fourth resistor R4 and the third resistor R3, and by utilizing the pull-up effect of the fifth resistor R5 and the voltage regulation protection of the Zener diode ZD1, control module 4 constructs a complete and stable power consumption control and circuit protection system. The rational configuration and coordinated operation of these components not only achieves low-power operation of the smart mattress system when the user is not in bed, but also effectively protects the circuit from damage caused by abnormal voltage, providing a strong guarantee for the long-term stable operation of the smart mattress system.

[0102] Although this invention frequently uses terms such as passive vibration detection module and power management module, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0103] Example 2

[0104] Embodiment 2 of the present invention provides a smart mattress, including the low-power bed-off detection circuit provided in Embodiment 1 above.

[0105] It should be noted that, from a circuit design perspective, the low-power bed-off detection circuit provided in Embodiment 1 can achieve accurate bed-off detection while minimizing energy consumption. This is undoubtedly of paramount importance for smart mattresses, which require continuous operation for extended periods and have specific power consumption requirements. It not only extends the lifespan of the smart mattress and reduces the inconvenience of frequent charging or battery replacements, but also aligns with the current trend of green environmental protection and energy conservation.

[0106] In terms of functionality, this low-power bed-off detection circuit can monitor the status of a person on and off the mattress in real time and accurately, converting this information into digital signals and transmitting them to the smart mattress's control system. Based on the received signals, the control system can react promptly, such as adjusting the mattress's comfort level (automatically adjusting the mattress's firmness and support based on the person's on-bed status). These functions greatly enhance the smart mattress's intelligence and user experience.

[0107] Furthermore, integrating low-power bed-off detection circuitry into smart mattresses provides ample room for further expansion and upgrades. With continuous technological advancements and increasingly diverse user needs, smart mattresses can leverage this detection circuitry to implement more personalized functions, such as sleep quality monitoring and health data analysis. Through long-term monitoring and data analysis of users' bed-off states, smart mattresses can provide users with more comprehensive and in-depth sleep health reports, helping them understand their sleep patterns, improve sleep quality, and prevent potential health problems.

[0108] In summary, the smart mattress provided in Embodiment 2 of the present invention, by integrating the low-power bed-off detection circuit in Embodiment 1, achieves a dual improvement in functionality and performance, setting a new benchmark for the development of the smart mattress industry.

[0109] Finally, it should be noted that although the above embodiments have been described in the description and drawings of this invention, this should not limit the scope of patent protection of this invention. Any technical solutions that are based on the essential concept of this invention, utilize the content described in the description and drawings of this invention to make equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this invention.

Claims

1. A low-power off-bed detection circuit, characterized in that, It includes a passive vibration detection module (1), a power management module (2), a weight detection module (3), and a control module (4); among which, The passive vibration detection module (1) is connected to the power management module (2) and is used to detect vibration and generate an electrical signal to trigger the power management module (2) to enter the working state. The power management module (2) is connected to the control module (4) and the weight detection module (3) respectively, and is used to output working voltage to the control module (4) and the weight detection module (3) after entering the working state. The weight detection module (3) is connected to the control module (4) and is used to detect weight and generate weight data; The control module (4) is used to detect whether the person is in bed or out of bed based on the weight data.

2. The low-power bed-off detection circuit according to claim 1, characterized in that, The control module (4) is also used to trigger the power management module (2) to exit the working state when it is detected that the bed is out of bed.

3. The low-power bed-off detection circuit according to claim 2, characterized in that, The passive vibration detection module (1) includes a passive vibration sensor (11) and a switching transistor Q1; The passive vibration sensor (11) is connected to the switching transistor Q1 and is used to detect vibration and generate an electrical signal; The switching transistor Q1 is connected to the power management module (2) and is used to turn on after receiving the electrical signal to trigger the power management module (2) to enter the working state.

4. The low-power bed-off detection circuit according to claim 3, characterized in that, The passive vibration sensor (11) is connected to the gate of the switching transistor Q1; The drain of the switching transistor Q1 is connected to the power supply. The source of the switching transistor Q1 is grounded and connected to the power management module (2).

5. The low-power bed-off detection circuit according to claim 4, characterized in that, The passive vibration detection module (1) also includes an interface J1, an electrostatic protection diode ESD1, a first capacitor C1, a first resistor R1, and a second resistor R2; The gate of the switching transistor Q1 is connected to the interface J1, thereby connecting to the passive vibration sensor (11); The drain of the switching transistor Q1 is connected to the first resistor R1, thereby connecting it to the power supply. The source of the switching transistor Q1 is connected to the first capacitor C1, thereby grounding it; The negative terminal of the electrostatic discharge protection diode ESD1 is connected to the gate of the switching transistor Q1, and the positive terminal of the electrostatic discharge protection diode ESD1 is grounded. One end of the second resistor R2 is connected to the gate of the switch Q1, and the other end of the second resistor R2 is grounded.

6. The low-power bed-off detection circuit according to claim 4, characterized in that, The power management module (2) includes a voltage regulator chip U1; The EN pin of the voltage regulator chip U1 is connected to the source of the switching transistor Q1; The Vout pin of the voltage regulator chip U1 is connected to the control module (4) and the weight detection module (3) respectively.

7. The low-power bed-off detection circuit according to claim 6, characterized in that, The power management module (2) also includes a sixth resistor R6, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; One end of the sixth resistor R6 is connected to the EN pin of the voltage regulator chip U1, and the other end of the sixth resistor R6 is grounded. One end of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are respectively connected to the Vout pin of the voltage regulator chip U1, and the other end of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are respectively grounded.

8. The low-power bed-off detection circuit according to claim 6, characterized in that, The control module (4) includes a control chip U2; The VCC pin of the control chip U2 is connected to the Vout pin of the voltage regulator chip U1; The PD4 and PD7 pins of the control chip U2 are respectively connected to the weight detection module (3).

9. The low-power bed-off detection circuit according to claim 8, characterized in that, The control module (4) also includes a Zener diode ZD1, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; The PB7 pin of the control chip U2 is connected to the fourth resistor R4 and the third resistor R3 in sequence, thereby connecting to the EN pin of the voltage regulator chip U1. One end of the fifth resistor R5 is connected to a 3.3V power supply, and the other end of the fifth resistor R5 is connected between the fourth resistor R4 and the third resistor R3. The negative terminal of the Zener diode ZD1 is connected between the fourth resistor R4 and the third resistor R3, and the positive terminal of the Zener diode ZD1 is grounded.

10. A smart mattress, characterized in that, Includes a low-power off-bed detection circuit as described in any one of claims 1-9.

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