Automatic leveling judgment circuit of electric bed and electric bed

Abstract

The utility model discloses an automatic leveling judgment circuit of an electric bed, which is applied to the electric bed with a bed board angle adjusting function, the electric bed can be divided into two working modes, namely a mode without a bed board automatic leveling function and a mode needing the bed board automatic leveling function, and the automatic leveling judgment circuit of the electric bed comprises a first switch unit and a second switch unit, a second switch unit and a third switch unit, each switch unit comprises a control end, an input end and an output end, and the control end controls connection and disconnection between the input end and the output end; the input end of the first switch unit is connected with a side-lying signal, the output end is connected with the control end of the second switch unit, and the control end is controlled by the working mode of the electric bed; according to the scheme, when the electric bed works in the function mode needing to be automatically laid flat and supine is changed into side lying, the instruction for automatically adjusting the angle of the bed board in the original setting is recovered when side lying is changed into supine, and in other modes, it is ensured that the bed board is not laid flat by mistake, and the comfort of a user is improved.

Description

Technical Field

[0001] This solution relates to the field of bedding that automatically adjusts the curvature of the bed board according to changes in sleeping postures, and specifically relates to an automatic flat - down judgment circuit for an electric bed and an electric bed. Background Art

[0002] An electric bed is a bedding composed of multiple independently adjustable bed boards that can automatically adjust the angles of each bed board according to changes in a person's sleeping posture. Currently, the function of adjusting the curvature of the bed board of an electric bed is set on the premise of the supine sleeping posture. By adjusting the angles of local bed boards in different parts of the electric bed, the supporting state is changed. For example, the relative heights of the bed boards at the back and knee joints are increased to make the pressure borne by each part of the human body more balanced and meet different needs when a person is supine.

[0003] However, the side - lying sleeping posture is also a common sleeping posture, and most people have turning - over movements during sleep, that is, they switch between the supine and side - lying states. If a person turns from supine to side - lying and the bed board of the electric bed is not automatically flattened in time, the person's spine will be in an unnatural bent state, which is not conducive to health and sleep.

[0004] The current solution for commercially available electric beds is to start the bed - board flattening function by manually operating the dedicated flattening control key on the electric - bed remote control or the operation panel to flatten the bed board. The problem is that the turning - over movement after a person falls asleep is usually carried out unconsciously. Obviously, it is impossible to operate the remote control or the control panel during sleep. Therefore, at the current technical level, when the user changes from the supine sleeping posture to the side - lying sleeping posture, there is a risk of damaging the spine and increasing local muscle fatigue. Therefore, those skilled in the art urgently need to solve an automatic flat - down judgment circuit for an electric bed to realize timely judgment that the user changes from supine to side - lying, and then automatically flatten the bed board. Summary of the Invention

[0005] The technical problem to be solved by the present utility model is how to automatically detect the change from supine to side - lying in the flat - down function mode during the operation of the electric bed, and then give an instruction to "flatten the bed board", and ensure that when the electric bed works in a mode that does not require the automatic flat - down function, the instruction to "flatten the bed board" will not be issued to avoid misoperation.

[0006] The specific technical solution adopted by the present utility model to solve the above - mentioned technical problems is as follows:

[0007] An automatic flat - down judgment circuit for an electric bed is applied to an electric bed with the function of adjusting the angle of the bed board. The electric bed has a control module, and the control module includes a control high - potential, a working - mode indication signal, and a power - output signal. The working - mode indication signal indicates that the electric bed is working in a mode that does not require the automatic flat - down function of the bed board or in a mode that requires the automatic flat - down function of the bed board.

[0008] The automatic flat - laying judgment circuit of the electric bed includes a first switch unit, a second switch unit, and a third switch unit. Each switch unit respectively includes a control end, an input end, and an output end, and the control end controls the on - off between the input end and the output end;

[0009] The input end of the first switch unit is connected to the side - lying signal, the output end of the first switch unit is connected to the control end of the second switch unit, the control end of the first switch unit is controlled by the working mode of the control module, and when the electric bed works in a mode that requires the automatic flat - laying function of the bed board, the control end of the first switch unit makes the input end and the output end of the first switch unit conduct;

[0010] The input end of the second switch unit is connected to the high potential in the control module, and the output end of the second switch unit outputs the bed - board flat - laying signal;

[0011] The control end of the third switch unit is connected to the supine signal; the input end of the third switch unit is connected to the high potential in the control module, and the output end of the third switch unit outputs the enable signal for the working mode that does not include the automatic flat - laying function of the bed board.

[0012] The above - mentioned technical solution has the following technical effects compared with the prior art:

[0013] The working mode indication signal of the control module is connected to the control end of the first switch unit. When the electric bed works in a mode that requires the bedplate to be automatically flattened, such as the sleep mode, snoring prevention mode, zero pressure mode, etc., in these modes, the user is in a sleeping state, making the input end and output end of the first switch unit conduct. However, at this time, the input end of the first switch unit is connected to the side lying signal. Therefore, if there is no side lying signal at this time, the output end of the first switch unit will still not have an output. And the output end of the first switch unit is connected to the control end of the second switch unit, that is, when there is no output at the output end of the first unit, the input end and output end of the second switch unit will not conduct either. Even if the input end of the second switch unit is continuously connected to the high potential in the control module, the output end of the second switch unit will remain at a low potential and will not output a high potential, and thus will not send out the "bedplate flattening" signal. When the side lying signal is received at the input end of the first switch unit, since the input end and output end of the first switch unit are conducting at this time, the side lying signal will pass through the first switch unit and be sent to the control end of the second switch unit, making the input end and output end of the second switch unit conduct. And the input end of the second switch unit has been connected to the high potential in the control module, so the output end of the second switch unit can output a high potential, that is, output the "bedplate flattening" signal. At the same time, when there is a side lying signal, there must be no supine signal. Here, there is and only one of the side lying signal and the supine signal with a signal, that is, the user is either lying on the side or lying on the back, and it is impossible to be lying on the side and on the back at the same time. The control end of the third switch unit is connected to the supine signal. When there is no supine signal, the input end and output end of the third switch unit are truncated, and then the bedplate angle self-adjustment function in the control module including the mode that requires the bedplate to be automatically flattened fails. When the supine signal arrives, the input end and output end of the third switch unit conduct. The input end of the third switch unit is connected to the high potential in the control module. Therefore, the conduction of the input end and output end will transfer the high potential to the output end of the third switch unit, that is, the output end of the third switch unit outputs a control signal and transports it to the control module, enabling the bedplate angle self-adjustment function in the control module including the mode that requires the bedplate to be automatically flattened to continue to be implemented. This avoids the self-contradictory situation where the control module requires both the bedplate to be automatically flattened and the bedplate to be automatically adjusted in angle.

[0014] When the electric bed works in a mode that does not require the bedplate to be automatically flattened, such as the reading mode, in this mode, the user leans on the back bedplate, and the bedplate is bent at a certain angle to adapt to the natural curvature of the human back and legs, and the automatic flattening function should not be triggered in this mode. When working in this mode, the working mode indication signal truncates the input end and output end of the first switch unit, and then the second switch unit always remains in a truncated state. Regardless of the input situation at the input end of the first switch unit subsequently, the output end of the second switch unit remains at a low level and will not output the "bedplate flattening" signal outward.

[0015] Thus, the above-mentioned automatic flat-laying judgment circuit of the electric bed makes the electric bed emit a bed board flat-laying signal based on the side-lying signal only when it works in the mode that requires the automatic flat-laying function. In the side-lying mode, the adjustment function of the automatic adjustment angle of the bed board fails, avoiding the self-contradictory situation where the control module outputs both the bed board flat-laying signal and the automatic adjustment angle signal. When working in other modes, even if there is a signal on the side-lying signal side, the bed board flat-laying signal will not be emitted, ensuring the normal use of other modes by users.

[0016] Furthermore, the first switch unit, the second switch unit, and the third switch unit are MOS transistors, the control end is the gate of the MOS transistor, and the input end and the output end are the source or the drain. MOS transistors are already very mature switching components, with low cost and stable operation. Regarding whether the input end is the source or the drain, it depends on whether the MOS transistor used is an NMOS type or a PMOS type. If an NMOS type MOS transistor is used, the input end is connected to the drain and the output end is connected to the source. Conversely, if a PMOS type MOS transistor is used, the input end is connected to the source and the output end is connected to the drain. Generally speaking, for an NMOS type MOS transistor, the MOS transistor conducts when the gate voltage is at a high potential, and for a PMOS type MOS transistor, the MOS transistor conducts when the gate voltage is at a low potential. This is well-known to those skilled in the art and will not be elaborated here. The control signal of the gate can flexibly configure the peripheral circuit.

[0017] Furthermore, the side-lying signal and the supine signal are provided by a differential pressure switch. The differential pressure switch includes a common terminal, a normally open contact, and a normally closed contact. The common terminal is connected to an external high potential, and the normally closed contact of the differential pressure switch is connected to the input end of the first switch unit; the normally open contact of the differential pressure switch is connected to the control end of the third switch unit. The purpose of the above connection method is that when working in the mode that requires the automatic flat-laying function of the bed board, when the side-lying signal is at a high potential, the second switch unit, that is, the second MOS transistor, conducts, and the third MOS transistor is cut off, realizing the automatic flat-laying of the bed board; when the supine signal is at a high potential, the state of the output end of the first MOS transistor controls the second MOS transistor to be cut off, and the third MOS transistor conducts, realizing the automatic adjustment of the bed board angle. When working in the mode that does not require the automatic flat-laying function of the bed board, the first MOS transistor is cut off, avoiding the automatic flat-laying signal from being sent into the control module.

[0018] Further, the high-pressure side of the differential pressure switch is connected to a long strip-shaped inflatable pad, which is arranged at a position on the bed adapted to the human shoulder, and the low-pressure side is communicated with the atmosphere. What the differential pressure switch actually measures is the pressure difference between the high-pressure side and the low-pressure side. When the pressure difference is greater than the first set threshold value, the normally open contact closes and the normally closed contact opens. When the pressure difference is less than the second set threshold value, the normally closed contact closes and the normally open contact opens. The difference between the first set threshold value and the second set threshold value is called the differential value of the differential pressure switch. Through the differential pressure switch, in cooperation with the inflatable pad, the supine or lateral lying posture of the human body can be recognized by the change of the air pressure value during supine and lateral lying, so as to provide a supine signal and a lateral lying signal for the automatic flat judgment circuit of the electric bed. Specifically, when the air pressure in the long strip-shaped airbag is constant, when a person lies supine, the long strip-shaped inflatable pad is sufficient to completely bear the pressure of the human shoulder, making the shoulder float above the long strip-shaped airbag, and the pressure in the long strip-shaped airbag is relatively high; when a person lies on the side, due to the smaller area of the human body acting on the long strip-shaped airbag, the gas in the long strip-shaped airbag transfers to the position not being squeezed and deforms, and the upper and lower airbag surfaces of the long strip-shaped airbag being squeezed by the shoulder are in contact with each other under the pressure of the human shoulder. Therefore, in this case, the long strip-shaped airbag can only partially bear the weight of the human shoulder, and the remaining weight is directly supported by the mattress. Therefore, the pressure in the long strip-shaped airbag during lateral lying is less than the airbag pressure during supine lying. Using this pressure difference, supine and lateral lying can be judged, and with the help of the differential pressure switch, a supine signal and a lateral lying signal can be generated.

[0019] Further, the low-pressure side of the differential pressure switch is connected to an air mattress through a buffer airbag, the high-pressure side is connected to a pressure storage airbag, the pressure storage airbag is communicated to the air mattress through a one-way valve, and the buffer airbag is communicated to the air mattress through a thin hose. Under normal use conditions, the air mattress can always completely support the weight of the human body. However, any movement of a person on the mattress will cause a change in the air pressure inside the mattress. To avoid misoperation of the differential pressure switch caused by slight air pressure changes, the high-pressure side of the differential pressure switch is communicated to the pressure storage airbag, and the low-pressure side is communicated to the air mattress through a thin hose and a buffer airbag. The buffer airbag and the thin hose weaken the pressure change, so that the pressure change within a short time will not be transmitted to the differential pressure switch, avoiding misoperation of the differential pressure switch. The thin hose mentioned here generally refers to a flexible tube with an inner diameter ≤ 2 mm. When using an air mattress, it should be noted that the pressure inside the air mattress during lateral lying is slightly greater than that during supine lying, which is something that most people can't think of. Because the air mattress itself is made of soft materials with a certain elasticity. When lying on the side, the area of the human body acting on the air mattress itself is smaller than that during supine lying, the local pressure is high, and the volume of the air mattress itself invaded by the material is large, which in turn leads to a decrease in the volume of the air mattress. With a certain amount of air, when the volume decreases, the pressure increases accordingly. Therefore, based on the difference in the pressure inside the air mattress during supine and lateral lying, with the help of the differential pressure switch, a lateral lying signal and a supine signal can be provided.

[0020] Furthermore, the side-lying signal and the supine signal are provided by a non-electric pneumatic adaptive pillow. The pneumatic adaptive pillow includes an airbag assembly, which is connected to the high-pressure side of a differential pressure switch through a hose, and the low-pressure side of the differential pressure switch is communicated with the atmosphere. When in the supine position, the airbag assembly is compressed and has a high pressure, while when in the side-lying position, the airbag assembly expands and has a relatively low pressure. By using this pressure difference and with the help of the differential pressure switch, the side-lying signal and the supine signal can be provided.

[0021] Furthermore, the side-lying signal and the supine signal are provided by an electric-driven pneumatic adaptive pillow. The electric-driven pneumatic adaptive pillow includes an airbag assembly, an air inflation pump and an air deflation valve. The signal for driving the air inflation pump to work is simultaneously used as the side-lying signal, and the signal for driving the air deflation valve to act is simultaneously used as the supine signal. When turning from the supine position to the side-lying position, the pressure of the airbag in the electric-driven adaptive pillow becomes lower, and the air pump starts to inflate, outputting the side-lying signal and completing the action of flattening the bed board. After a certain period of time (exceeding the time required to flatten the bed board), when the pressure of the airbag assembly reaches the set side-lying pressure, the inflation stops, and at the same time, the side-lying signal output stops (and there is no supine signal output either); when turning from the side-lying position to the supine position, the pressure of the airbag in the electric-driven adaptive pillow becomes higher, and the air deflation valve starts to deflate, outputting the supine signal and completing the conversion of the set mode of the bed board. After a certain period of time (exceeding the time required for the conversion of the set mode of the bed board), when the pressure of the airbag assembly reaches the set supine pressure, the air deflation valve stops deflating, and at the same time, the supine signal output stops (and there is no side-lying signal output either). Thus, the working signals of the air deflation valve and the air inflation pump can be directly used as the supine signal and the side-lying signal.

[0022] Furthermore, the side-lying signal and the supine signal are provided by a strip-shaped thin-film pressure sensor and a signal processing module. The strip-shaped thin-film pressure sensor is arranged at a position on the mattress adapted to the shoulder. The pressure sensor transmits the potential signal corresponding to the detected pressure value to the signal processing module. The signal processing module screens the highest pressure value within a set time period. If the highest pressure value is higher than the set threshold, the signal processing module sends out a side-lying signal externally; if it is lower than the set threshold, it sends out a supine signal externally. The principle is that when in the supine position, the contact area between the shoulder and the strip-shaped thin-film sensor is large, the pressure sensed by each sensor is low, and the signal intensity output by the sensors at the contact position is low. When in the side-lying position, since the contact area between the shoulder and the strip-shaped thin-film sensor is small, the pressure sensed by each sensor is large, and the signal intensity output by the sensors at the contact position is high. Based on the magnitude of the maximum pressure sensed by the pressure sensor or the difference in the pressure sensed by each sensor, it can be determined whether it is the supine posture or the side-lying posture, and then the supine signal and the side-lying signal can be given.

[0023] The present utility model also discloses an electric bed, including the above-mentioned electric bed automatic flattening judgment circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the working principle of Embodiment 1;

[0025] Figure 2 Schematic diagram of the working principle of Embodiment 2;

[0026] Figure 3 Schematic diagram of the working principle of Embodiment 4;

[0027] Figure 4 Schematic diagram of the working principle of Embodiment 5;

[0028] Figure 5 Schematic diagram of the working principle of Embodiment 6.

[0029] In the attached drawings, the list of component names represented by each label is as follows:

[0030] 1. Air cushion; 11. Bearing airbag; 12. Hose; 13. Inflatable ball; 2. Lateral lying lead wire; 3. Differential pressure switch; 4. Supine lying lead wire; 5. Electric bed automatic flattening judgment circuit; 51. First NMOS; 511. PMOS; 52. Second NMOS; 53. Third NMOS; 6. First electric push rod; 7. Second electric push rod; 8. Control module;

[0031] 100. Inflatable mattress; 101. Main airbag; 102. Thin hose; 103. Buffer airbag; 104. Check valve; 105. Pressure accumulation airbag; 106. Constant pressure inflation device;

[0032] 210. Pneumatic adaptive pillow; 211. Air pump; 212. Air release valve;

[0033] 441 Strip-shaped thin film pressure sensor, 442 Signal processor. Specific implementation manners

[0034] The principles and features of the present utility model are described below in conjunction with examples. The examples given are only for explaining the present utility model and are not used to limit the scope of the utility model.

[0035] Embodiment 1:

[0036] As Figure 1As shown in the figure, an adaptive electric bed includes an air cushion 1, a side-lying lead wire 2, a supine lead wire 4, an adjustable single-pole double-throw differential pressure switch (hereinafter referred to as differential pressure switch) 3, and an electric bed automatic flatness judgment circuit 5. The air cushion 1 includes a load-bearing airbag 11, a hose 12, and a balloon pump 13. The electric bed further includes a mattress, a tiltable bed board, a bed frame, a remote control, a first electric push rod 6, a second electric push rod 7, and a control module 8. The first electric push rod 6 and the second electric push rod 7 are used to drive the tiltable bed board to adjust the angle. The load-bearing airbag 11 is connected to the differential pressure switch 3 through the hose 12. The differential pressure switch 3 is connected to the electric bed automatic flatness judgment circuit 5 through the side-lying lead wire 2 and the supine lead wire 4. The electric bed automatic flatness judgment circuit 5 is connected to the single-chip microcomputer in the control module 8 through the function expansion port of the control module 8.

[0037] The electric bed has multiple working modes, which are generally divided into two categories. One category is the mode that requires the function of automatically flattening the bed board, such as the anti-snoring mode and the zero-pressure mode. The other category is the mode that does not require the function of automatically flattening the bed board, such as the reading mode.

[0038] The automatic flat - down judgment circuit 5 of the electric bed is composed of three N - channel field - effect transistors, namely the first NMOS 51, the second NMOS 52, and the third NMOS 53. The drain of the first NMOS 51 is connected to the side - lying lead 2, the source of the first NMOS 51 is connected to the gate of the second NMOS 52, and the gate of the first NMOS 51 is connected to the working - mode indication signal in the control module 8. The working - mode indication signal is at a low potential when the electric bed is operating in a mode that does not require the automatic flat - down function of the bed board, and is at a high potential when operating in a mode that requires the automatic flat - down function of the bed board. That is, when the electric bed is operating in a mode that does not require the automatic flat - down function of the bed board, the gate of the first NMOS 51 is at a low potential, and when the electric bed is operating in a mode that requires the automatic flat - down function of the bed board, the gate of the first NMOS 51 is at a high potential. The supine lead 4 is connected to the gate of the third NMOS 53. The output end of the second NMOS 52 is connected to the circuit in the control module 8 that controls the flat - down function of the bed board to enable the flat - down function of the bed board. That is, when the output end of the second NMOS 52 is at a high potential, the control module activates the flat - down function of the bed board. The supine lead is connected to the gate of the third NMOS 53, and the output end of the third NMOS 53 is connected to the circuit of the bed - board angle self - adjustment function in the control module 8 in the mode that requires the automatic flat - down function of the bed board. That is, when the output end of the third NMOS 53 outputs a high potential, the bed - board angle self - adjustment function in the control module 8 is activated, and the angle of the bed board is automatically adjusted according to the set working mode (such as the anti - snoring mode or the zero - pressure mode, etc.). If the electric bed is operating in a mode that does not require the automatic flat - down function of the bed board, the output of the third NMOS 53 does not affect the adjustment of the bed - board angle by the control module 8. This can be achieved by separately setting the circuit for adjusting the bed - board angle in the mode that requires the automatic flat - down function of the bed board and the circuit for adjusting the bed - board angle in the mode that does not require the automatic flat - down function of the bed board, or by sharing a single bed - board angle adjustment circuit, but by setting the prerequisite conditions for the operation of the angle - adjustment program through the single - chip microcomputer program, that is, using two parameters, the working mode and the state of the output end of the third NMOS 53, to jointly determine whether to execute the angle self - adjustment function. More specifically, those skilled in the art have numerous options in the prior art, which will not be elaborated here.

[0039] In this example, a long strip-shaped bearing airbag 11 disposed at the shoulder position on the mattress is used as the pressure detection object. The initial inflation pressure of the bearing airbag 11 is 40 - 80 Pa, and it is placed at the shoulder position on the mattress. When lying on the back, in the case of a specific user, the pressure of the bearing airbag 11 rises to 800 Pa, and the air pressure supporting force completely balances the shoulder pressure. When lying on the side, because the acting area of the shoulder on the bearing airbag 11 is relatively small, under the condition of the same initial inflation pressure, the air pressure of the bearing airbag 11 is not sufficient to balance the shoulder pressure, and part of the shoulder pressure is directly borne by the mattress (bed board). The pressure of the bearing airbag 11 is less than 400 Pa, which is significantly lower than the pressure when lying on the back. A hose is used to connect the bearing airbag 11 to the differential pressure switch 3. The pressure measurement value of the differential pressure switch 3 is set to 700 Pa, and the differential value is set to 200 Pa. That is, when the pressure of the bearing airbag 11 is greater than 700 Pa, the connection of the normally closed contact is disconnected, and the normally open contact is connected. When the pressure of the bearing airbag 11 is less than 500 Pa, the connection of the normally open contact is disconnected, and the normally closed contact is connected. The common contact of the differential pressure switch 3 is connected to the high potential. Thus, the differential pressure switch 3 can provide clear side-lying signals and supine signals to the automatic flat judgment circuit of the electric bed based on the change of the pressure of the bearing airbag 11.

[0040] When the electric bed works in the anti-snoring mode or zero-pressure mode, the working mode indication signal is at a high potential. When the user lies on the side or no one is using it, the pressure of the bearing airbag 11 is lower than 500 Pa. The common contact of the differential pressure switch 3 remains connected to the normally closed contact. The high potential of the working mode indication signal turns on the gate of the first NMOS 51, making the source and drain of the first NMOS 51 conduct, so that the source and drain of the second NMOS 52 connected to the flatting circuit also conduct, and the bed board flatting function in the control module 8 is started, and the function of automatically flattening the bed board when lying on the side and when no one is using it is realized through the first electric push rod 6 and the second electric push rod 7; when the user lies on the back, the pressure of the bearing airbag 11 is higher than 700 Pa, the common contact of the differential pressure switch 3 is connected to the normally open contact, and the gate of the third NMOS 53 becomes a high potential, and the source and drain of the third NMOS 53 conduct, so that the bed board angle self-adjustment function in the bed board automatic flatting function mode is restored to start, that is, it is restored to the default working mode in the supine position. If it is set to the anti-snoring mode, the bed board angle is automatically adjusted according to the anti-snoring mode setting. If it is set to the zero-pressure mode, the bed board angle is automatically adjusted according to the zero-pressure mode setting; when the subsequent user changes from lying on the back to lying on the side again, the pressure of the bearing airbag 11 is lower than 500 Pa, and the common contact and the normally closed contact are connected, and the bed board starts the automatic flatting function again.

[0041] When the electric bed is operating in modes such as the reading mode and the TV watching mode that do not require the automatic flat function of the bed board, the working mode indication signal of the control module is at a low potential. The gate potential of the first NMOS 51 is low, and the connection between the source and drain of the first NMOS 51 is cut off. Even if the input source of the first NMOS 51 is connected to a high potential, its drain has no output and remains at a low potential. Consequently, the second NMOS 52 is also in a cut-off state, and the bed board automatic flat signal will not be transmitted into the control module 8, rendering the bed board automatic flat function ineffective. This ensures that the reading mode and the TV watching mode, etc., will not accidentally trigger the automatic flattening of the bed board. In this example, when the user is in a state that requires the automatic flat function, such as the zero-pressure mode or the anti-snoring mode of the electric bed, it can automatically detect that the user has turned from supine to lateral position and trigger the bed board automatic flat function, avoiding damage to the spine or increased fatigue caused by an uneven bed board, always maintaining a proper supporting state of the electric bed, and improving sleep quality.

[0042] Embodiment 2:

[0043] As Figure 2 shown, different from Embodiment 1, in this example, an inflatable mattress 100 is used to replace the air cushion 1 in Embodiment 1. The inflatable mattress 100 is composed of a main airbag 101, a thin hose 102, a buffer airbag 103, a one-way valve 104, a pressure storage airbag 105, and a constant-pressure inflation device 106. The main airbag 101 is connected to the buffer airbag 103 by the thin hose 102. The pressure storage airbag with the one-way valve 104 is also connected to the main airbag 101 by the thin hose. The one-way valve 104 allows gas to flow unidirectionally only from the main airbag 101 to the pressure storage airbag 105 and not back from the pressure storage airbag 105 to the main airbag 101. The buffer airbag 103 is connected to the low-pressure side joint of the differential pressure switch 3, and the pressure storage airbag 105 is connected to the high-pressure side joint of the differential pressure switch 3.

[0044] After filling the inflatable mattress 100 with gas and reaching an appropriate pressure initially (which can be adjusted according to the user's weight specifically), when lying on the side, the air pressure in the main airbag 101 is higher than that when lying on the back. Within a certain initial air pressure range, the pressure difference is less affected by the change of the initial pressure. For example, under certain conditions, the side-back pressure difference reaches 200 Pa. The pressure accumulator airbag 105 with a one-way valve 104 can maintain the airbag pressure when a person lies on the side. Even if the pressure of the main airbag 101 becomes lower, due to the one-way cut-off function of the one-way valve 104, the pressure in the pressure accumulator airbag 105 still maintains or is close to the pressure of the main airbag 101 when lying on the side. Since both the pressure accumulator airbag 105 and the buffer airbag 103 are connected to the main airbag 101 by thin hoses 102, when the pressure of the main airbag 101 fluctuates, the fluctuation reflected in the differential pressure switch 3 will be buffered. Therefore, it avoids the misoperation of the differential pressure switch 3 caused by the instantaneous fluctuating differential pressure signal during non-turning actions. For example, in the case of a specific user, after setting the measured value of the differential pressure switch 3 to 170 Pa and the differential value to 100 Pa, when setting the anti-snoring mode or zero-pressure mode, when lying on the side, the pressure difference between the main airbag 101 and the pressure accumulator airbag 105 is close to zero, while when lying on the back, the pressure difference between the pressure accumulator airbag 105 and the main airbag 101 is greater than 170 Pa. Therefore, when lying on the side, the normally closed contact of the differential pressure switch 3 is connected to the side-lying lead 2, and when lying on the back, the normally open contact of the differential pressure switch 3 is connected to the back-lying lead 4. Thus, the detection of lying on the side and lying on the back is realized.

[0045] Embodiment 3:

[0046] Different from Embodiment 1, in this example, by setting a non-electric pneumatic adaptive pillow on the bed (specific reference to the patent application with the patent application number 2024107963282), replacing the air cushion 1, the pneumatic adaptive pillow is provided with an airbag assembly with automatically adjustable airbag width, an inflation hose and an inflation ball, and the airbag assembly is connected to the differential pressure switch 3 by a hose. When lying on the back, the pressure of the airbag assembly is higher than that when lying on the side, and the pressure difference reaches 300 Pa. Set the measured value of the differential pressure switch to 250 Pa and the differential value to 150 Pa. After setting the electric bed to the anti-snoring mode or zero-pressure mode, the bed board can also be automatically flattened when lying on the side and when there is no one, and the bed board can automatically return to the set mode when lying on the back.

[0047] Embodiment 4

[0048] Such as Figure 3As shown, different from the foregoing embodiments, in this example, a pneumatic adaptive pillow 210 equipped with an air pump and an air release valve is provided on the mattress (specifically refer to patent application number 2024107963282) to replace the air cushion 1 and the differential pressure switch 3. A side-lying lead 2 is provided at the action signal of the air pump 211 inside the pneumatic adaptive pillow 210, and a supine lead 4 is provided at the action signal of the air release valve 212 of the pneumatic adaptive pillow 210. The side-lying lead 2 is connected to the drain of the first NMOS 51, and the supine lead 4 is connected to the gate of the third NMOS 53. When the electric bed is set to the anti-snoring mode or the zero-pressure mode, when the user lies on their side or when there is no one, the air pump 211 of the pneumatic adaptive pillow 210 operates to achieve automatic inflation. The high potential of the side-lying lead 2 makes the second NMOS 52 conduct, and the bed board is automatically flattened. The low potential of the supine lead 4 makes the third NMOS 53 cut off, and the automatic angle adjustment function fails; when turning from side-lying to supine, the air release valve 212 of the pneumatic adaptive pillow 210 operates to achieve automatic deflation. The high potential of the supine lead 4 makes the third NMOS 53 conduct, and the control module 8 automatically adjusts the angle of the bed board based on the control logic of the originally set anti-snoring mode or zero-pressure mode. In this example, the method of obtaining the side-lying and supine states is not affected by the air pressure change of the airbag caused by temperature changes.

[0049] Embodiment 5

[0050] As Figure 4 shown, a strip-shaped thin-film pressure sensor 441 and a signal processing module 442 are provided at the corresponding position of the shoulder of the mattress to replace the air cushion 1 and the differential pressure switch 3. Potential output terminals corresponding to the side-lying lead 2 and the supine lead 4 are respectively provided on the signal processing module 442. The side-lying lead 2 is connected to the drain of the first NMOS 51 of the automatic flattening judgment circuit 5 of the electric bed, and the supine lead 4 is connected to the gate of the third NMOS 53. Comparing side-lying and supine, when lying on the side, the pressure of the body shoulder on the strip-shaped thin-film pressure sensor 441 is relatively large and the output potential is relatively high. When lying on the back, the pressure of the body shoulder on the strip-shaped thin-film pressure sensor 441 is relatively small and the output potential is relatively low. The signal processing module 442 determines whether to set the output terminal corresponding to the supine lead 4 or the side-lying lead 2 to a high potential by comparing the size relationship between the signal output by the strip-shaped thin-film pressure sensor 441 and the set threshold. When the electric bed is set to the anti-snoring mode or the zero-pressure mode, it is also possible to automatically flatten the bed board when lying on the side, and the bed board returns to the original automatic adjustment mode of the bed board angle when lying on the back. Compared with the foregoing other embodiments, this example avoids the influence of the initial pressure change caused by factors such as the air pressure of the airbag affected by temperature changes and air leakage of the airbag, and more stably realizes the function of automatically flattening the bed board when the electric bed is in the side-lying position at a relatively low cost.

[0051] Embodiment 6

[0052] AsFigure 5 As shown, in this example, the automatic flat-laying judgment circuit 5 of the electric bed is composed of a P-channel field effect transistor, namely PMOS 511, and two N-channel field effect transistors, namely the second NMOS 52 and the third NMOS 53. Among them, the source of PMOS 511 is connected to the side-lying lead 2, the drain of PMOS 511 is connected to the gate of the second NMOS 52, and the gate of PMOS 511 is connected to the working mode indication signal in the control module 8. In this example, the working mode indication signal is at a high potential when the electric bed works in a mode that does not require the automatic flat-laying function of the bed board, and is at a low potential when it works in a mode that requires the automatic flat-laying function of the bed board. This is different from the previous embodiments and can be easily implemented in the control module 8. If it is implemented in the form of a circuit, it can be implemented with an inverter circuit. If it is implemented with a single-chip microcomputer, the output value of the output pin can be set through a program. Therefore, in this example, when the electric bed works in a mode that does not require the automatic flat-laying function of the bed board, the gate of PMOS 511 is at a high potential; when the electric bed works in a mode that requires the automatic flat-laying function of the bed board, the gate of PMOS 511 is at a low potential. Based on the working principle of PMOS, when the gate is at a high potential, the input and output ends of PMOS 511 are cut off; when the gate of PMOS 511 is at a low potential, the input and output ends of PMOS 511 are conducting. The output end of the second NMOS 52 is connected to the circuit in the control module 8 that controls the flat-laying function of the bed board to enable the flat-laying function of the bed board. The supine lead 4 is connected to the gate of the third NMOS 53, and the output end of the third NMOS 53 is connected to the circuit of the bed board angle self-adjustment function in the control module 8 in the mode that requires the flat-laying function of the bed board. That is, when the output end of the third NMOS 53 outputs a high potential, the bed board angle self-adjustment function in the control module 8 is activated, and the angle of the bed board is automatically adjusted according to the set working mode (such as the anti-snoring mode or the zero-pressure mode, etc.).

[0053] The utility model realizes the perception of the change of sleeping posture, automatically adjusts the supporting height of the bed board, realizes the automatic conversion between the flat-laying mode and the set supine mode of the electric bed, has strong adaptability, simple structure, low manufacturing cost, reliable self-adaptive action, prevents the deformation of the spine during side-lying, obtains a good spine protection effect, and improves sleep quality.

Claims

1. An automatic flat - down judgment circuit for an electric bed, which is applied to an electric bed with the function of adjusting the angle of the bed board. The electric bed has a control module, and the control module includes a control high - potential, a working - mode indication signal, and a power - output signal. The working - mode indication signal indicates that the electric bed works in a mode that does not require the automatic flat - down function of the bed board or in a mode that requires the automatic flat - down function of the bed board. It is characterized in that: The automatic flat - down judgment circuit of the electric bed includes a first switch unit, a second switch unit, and a third switch unit. Each switch unit respectively includes a control end, an input end, and an output end, and the control end controls the on - off between the input end and the output end; The input end of the first switch unit is connected to the side - lying signal, the output end of the first switch unit is connected to the control end of the second switch unit, and the control end of the first switch unit is controlled by the working mode of the control module. And when the electric bed works in a mode that requires the automatic flat - down function of the bed board, the control end of the first switch unit makes the input end and the output end of the first switch unit conduct; The input end of the second switch unit is connected to the high - potential in the control module, and the output end of the second switch unit outputs a bed - board flat - down signal; The control end of the third switch unit is connected to the supine signal; the input end of the third switch unit is connected to the high - potential in the control module, and the output end of the third switch unit outputs an enabling signal for the self - adjusting function of the bed - board angle in the mode that requires the automatic flat - down function of the bed board.

2. The automatic flat-laying judgment circuit of the electric bed according to claim 1, wherein The first switch unit, the second switch unit, and the third switch unit are MOS transistors, the control end is the gate of the MOS transistor, and the input end and the output end are the source or the drain.

3. The automatic flat - laying judgment circuit of the electric bed according to claim 2, wherein, The side - lying signal and the supine signal are provided by a differential - pressure switch. The common end of the differential - pressure switch is connected to an external high - potential, the normally - closed contact of the differential - pressure switch is connected to the input end of the first switch unit; the normally - open contact of the differential - pressure switch is connected to the control end of the third switch unit.

4. The automatic flat-laying judgment circuit for an electric bed according to claim 3, wherein The high - pressure side of the differential - pressure switch is connected to a long - strip inflatable pad, and the low - pressure side communicates with the atmosphere. The long - strip inflatable pad is arranged at a position on the bed that fits the human shoulder.

5. The automatic flat-laying judgment circuit of the electric bed according to claim 3, characterized in that, The low - pressure side of the differential - pressure switch is connected to an air - filled mattress through a buffer air bag, the high - pressure side is connected to a pressure - accumulating air bag, the pressure - accumulating air bag is connected to the air - filled mattress through a one - way valve, and the buffer air bag is connected to the air - filled mattress through a thin hose.

6. The automatic flat - laying judgment circuit of the electric bed according to claim 2, wherein The side - lying signal and the supine signal are provided by a non - electrical pneumatic adaptive pillow. The pneumatic adaptive pillow includes an air - bag assembly, and the air - bag assembly is connected to the high - pressure side of the differential - pressure switch through a hose.

7. The automatic flat-laying judgment circuit of the electric bed according to claim 2, characterized in that, The side - lying signal and the supine signal are provided by an electric - drive pneumatic adaptive pillow. The electric - drive pneumatic adaptive pillow includes an air - inflation pump and an air - deflation valve. The signal for driving the air - inflation pump to work is simultaneously used as the side - lying signal, and the signal for driving the air - deflation valve to act is simultaneously used as the supine signal.

8. The automatic flat-laying judgment circuit of the electric bed according to claim 2, characterized in that, The side-lying signal and the supine signal are provided by a strip-shaped thin-film pressure sensor and a signal processing module. The strip-shaped thin-film pressure sensor is arranged at a position on the mattress adapted to the shoulder. The pressure corresponding potential detected by the pressure sensor is transmitted to the signal processing module. The signal processing module screens the highest pressure value within a set time period. If the highest pressure value is higher than the set threshold, the signal processing module externally emits a side-lying signal; if it is lower than the set threshold, it externally emits a supine signal.

9. An electric bed, characterized in that, It includes the automatic flat-laying judgment circuit of the electric bed according to any one of claims 1-8.

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