Push rod controlled by single bus

Abstract

The utility model discloses a push rod controlled by a single bus. The push rod comprises a push rod body and an intelligent control panel, the push rod body is connected with a push rod motor; the intelligent control board is provided with an MCU, a motor driving chip and an acceleration sensor, the motor driving chip and the acceleration sensor are connected with the MCU, the MCU is connected with a second communication control interface and a second power supply interface, and the second communication control interface is used for being connected with a first communication control interface on a single communication bus. The second power supply interface is used for connecting a first power supply interface on a group of power lines; the motor driving chip is connected to the push rod motor; unibus communication between the control host and the push rod is realized, intelligent control on the push rod is realized, and the wiring cost of the push rod is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of push rods, in particular to a push rod controlled by a single bus. Background Art

[0002] Linear Actuator, also known as electric push rod, electric cylinder and linear actuator.

[0003] An electric linear actuator is an electrically driven device that converts the rotational motion of a motor into linear reciprocating motion of a push rod. It can be used as an actuator in a variety of simple or complex process flows to achieve remote, centralized, or automated control.

[0004] Currently, actuators powered by DC motors are widely used in various devices. A rotary encoder is typically used to measure the position of the motor's output shaft. If a Hall effect sensor is used, the zero point position must also be known to calculate the actuator's stroke or angle. This is then driven by two power lines from the actuator's DC motor to reach the target position. This results in a complex measurement method.

[0005] When multiple actuators need to be linked in a device, multiple control lines are required to connect the host of the device and the multiple actuators, which increases the wiring cost.

[0006] Therefore, in the present utility model patent application, the applicant has carefully studied a single bus controlled push rod to solve the above problems. Utility Model Content

[0007] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a single-bus controlled push rod, which realizes single-bus communication between the control host and the push rod, implements intelligent control of the push rod, and reduces the wiring cost of the push rod.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A single bus controlled actuator, comprising:

[0010] A push rod body; the push rod body is connected to a push rod motor;

[0011] An intelligent control board; the intelligent control board is provided with an MCU and a motor driver chip and an acceleration sensor respectively connected to the MCU; the MCU is connected to a second communication control interface and a second power supply interface; the second communication control interface is used to connect to the first communication control interface on a single communication bus; the second power supply interface is used to connect to the first power supply interface on a group of power lines;

[0012] The motor driving chip is connected to the push rod motor.

[0013] As a preferred solution, the push rod motor is connected to the push rod body through a push rod transmission assembly.

[0014] As a preferred solution, the telescopic end of the push rod body is used to be pivotally connected to the bed board, the fixed end of the push rod body is used to be pivotally connected to the bed frame, and the intelligent control panel is arranged on the push rod body.

[0015] As a preferred solution, the intelligent control board is further provided with a communication circuit for communicating with the control host, and the communication circuit is connected to the second communication control interface.

[0016] As a preferred solution, the communication circuit includes a sending circuit and a receiving circuit. The receiving circuit is used to convert the signal on the single communication bus into a signal that can be recognized by the intelligent control board. The sending circuit is used to convert the signal sent by the intelligent control board of this slave machine into a bus signal, which is transmitted via the single communication bus for recognition and processing by the control host.

[0017] As a preferred solution, the intelligent control panel is further provided with a display screen, and the MCU is connected to the display screen.

[0018] As a preferred solution, the transmitting circuit includes a transistor Q2, a resistor R15 and a resistor R17;

[0019] The base of the transistor Q2 is connected to the MCU via the resistor R15 , and the base of the transistor Q2 is further connected to the emitter of the transistor Q2 via the resistor R17 . The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the first communication control interface.

[0020] As a preferred solution, the receiving circuit includes a transistor Q1, a resistor R14, a resistor R18, a resistor R16 and a capacitor C9;

[0021] The base of the transistor Q1 is connected to the first communication control interface through the resistor R14. The base of the transistor Q1 is also connected to the emitter of the transistor Q2 through the resistor R16. The emitter of the transistor Q1 is grounded. The capacitor C9 and the resistor R16 are connected in parallel. One end of the resistor R18 is used to connect to the 3.3V voltage terminal. The other end of the resistor R18 is connected to the collector of the transistor Q1, and the collector of the transistor Q1 is connected to the MCU.

[0022] As a preferred solution, the transmitting circuit includes a resistor R4, a resistor R18, a transistor Q2, a resistor R2, a transistor Q3 and a diode D2;

[0023] The MCU is connected to the base of the transistor Q2 through the resistor R4, the base of the transistor Q2 is connected to the emitter of the transistor Q2 through the resistor R18, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the base of the transistor Q3, the base of the transistor Q3 is connected to the emitter of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is used to connect to the VCC2 voltage terminal, the collector of the transistor Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the first communication control interface.

[0024] As a preferred solution, the receiving circuit includes a resistor R13, a resistor R15, a transistor Q6, a transistor Q8, a resistor R14, a resistor R10 and a resistor R8;

[0025] Resistor R14 and resistor R10 are connected in series, the non-series node of resistor R14 is connected to the MCU, the series node of resistor R14 and resistor R10 is connected to the collector of transistor Q8, the non-series node of resistor R16 is used to connect to the 3.3V voltage terminal, the base of transistor Q8 and one end of resistor R8 are both connected to the collector of transistor Q6, the other end of resistor R8 is used to connect to the 3.3V voltage terminal, the base of transistor Q6 is connected to the first communication control interface, the base of transistor Q6 is also grounded through resistor R15, and the emitters of both transistor Q8 and transistor Q6 are grounded.

[0026] Compared with the prior art, the utility model has obvious advantages and beneficial effects: it mainly realizes single bus communication between the control host and the push rod, realizes intelligent control of the push rod, and also reduces the wiring cost of the push rod;

[0027] Secondly, the intelligent control board is set on the push rod body. The built-in MCU of the intelligent control board reads the acceleration sensor value, and the rotation angle of the push rod body can be calculated, and then the stroke of the push rod can be obtained. The stroke measurement method is simple.

[0028] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a system connection diagram of the electric control system of the intelligent electric bed according to an embodiment of the present utility model;

[0030] Figure 2 This is a connection block diagram of the control host of an embodiment of the present utility model;

[0031] Figure 3 This is a connection block diagram of a single bus controlled push rod according to an embodiment of the present utility model;

[0032] Figure 4This is a diagram illustrating the connection of a first communication circuit of a control host according to an embodiment of the present utility model;

[0033] Figure 5 This is a partial circuit schematic diagram of a single bus controlled push rod according to an embodiment of the present utility model;

[0034] Figure 6 This is a structural diagram of an intelligent electric bed using the intelligent electric bed electric control system of an embodiment of the present utility model;

[0035] Figure 7 It is a partial enlarged structural diagram of an embodiment of the present utility model (mainly showing the application state of the single-bus controlled push rod);

[0036] Figure 8 This is a logic diagram of the communication process of the electric control system of the intelligent electric bed according to an embodiment of the present utility model;

[0037] Figure 9 This is a timing diagram of signals sent by the host of the intelligent electric bed electric control system according to an embodiment of the present utility model;

[0038] Figure 10 This is a timing diagram of a slave receiving a signal in the electric control system of an intelligent electric bed according to an embodiment of the present invention;

[0039] Figure 11 This is a block diagram of the master and slave control principles of a single bus controlled push rod according to another embodiment of the present invention;

[0040] Figure 12 It corresponds to Figure 11 Schematic diagram of the circuit.

[0041] Description of the accompanying drawings:

[0042] 10. Control host 11. Control output port

[0043] 12. First communication circuit 13. Host MCU

[0044] 21. Communication bus 211. First communication control interface

[0045] 22. Positive power line 23. Negative power line

[0046] 24. First power supply interface 25. Power adapter

[0047] 26. Line

[0048] 30. Slave

[0049] 31. Second communication control interface 32. Second power supply interface

[0050] 41. Motor driver chip 42. Acceleration sensor

[0051] 43. MCU

[0052] 44. Push rod motor 45. Push rod transmission assembly

[0053] 46. ​​Second communication circuit 47. Display screen

[0054] 51. Putter body

[0055] 511, telescopic end 512, fixed end

[0056] 61. Bed board 62. Bed frame DETAILED DESCRIPTION

[0057] Please refer to Figures 1 to 12 As shown, it shows the specific structure of an embodiment of the present utility model.

[0058] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0059] A single bus controlled actuator, comprising:

[0060] The push rod body 51; the push rod body 51 is connected to the push rod motor 44; the telescopic end 511 of the push rod body 51 is used to pivot with the bed board 61, and the fixed end 152 of the push rod body 51 is used to pivot with the bed frame 62, and the intelligent control panel is set on the push rod body 51.

[0061] Intelligent control board; the intelligent control board is provided with an MCU 43, a display screen 47, and a motor driver chip 41, an acceleration sensor 42, and a display screen 47 respectively connected to the MCU 43; the MCU 43 is connected to a second communication control interface 31 and a second power supply interface 32; the second communication control interface 31 is used to connect to the first communication control interface on a single communication bus, and the second power supply interface 32 is used to connect to the first power supply interface on a group of power lines;

[0062] The motor driving chip 41 is connected to the push rod motor 44. In this embodiment, the push rod motor 44 is connected to the push rod body 51 through the push rod transmission component 45. The push rod transmission component 45 includes a push rod gear and a screw.

[0063] The intelligent control board is also provided with a communication circuit for communicating with the control host, and the communication circuit is connected to the second communication control interface 31. The communication circuit includes a transmitting circuit and a receiving circuit. The receiving circuit is used to convert the signal on the single communication bus into a signal recognizable by the intelligent control board, and the transmitting circuit is used to convert the signal sent by the intelligent control board of the slave device into a bus signal, which is transmitted via the single communication bus for recognition and processing by the control host.

[0064] An intelligent electric bed electric control system includes a control host 10, a single communication bus 21, a set of power lines and a plurality of slave devices 30.

[0065] The control host 10 is used to interact with the user through any one or more methods such as Bluetooth, remote control, voice, etc. The control host 10 is provided with a control output port 11; the position of the control host 10 is not restricted and can be flexibly arranged. It can be separated from the bed frame and placed in other places, such as the head of the bed, near the head of the bed, or other places convenient for placing the control host 10, so as to give new functions to the control host 10 as needed. For example: the control host 10 is designed to have a better decorative effect, so that it can be used as a bedside ornament, a bedside lamp, a night light, an atmosphere light, etc., and can even integrate intelligent small robot functions such as alarm clock, music playback, story playback, and reading companionship, so that it can be used for multiple purposes and effectively improve the user experience.

[0066] The single communication bus 21 is a communication bus capable of transmitting signals bidirectionally. One end of the single communication bus 21 is connected to the control output port 11 of the control host 10 . A plurality of first communication control interfaces 211 are preset at intervals along the length direction of the single communication bus 21 .

[0067] The group of power lines provides a DC low voltage, and a plurality of first power supply interfaces 24 are preset at intervals along the length direction of the group of power lines; one end of the group of power lines is connected to a power adapter 25, and the input end of the power adapter 25 is used to connect to the mains power supply end, and its voltage is usually between 100-220V. The power adapter 25 outputs a DC low voltage, so that a group of power lines (positive power line 22, negative power line 23) provides a DC low voltage, and the control host 10 draws power from a first power supply interface 24, so that the group of power lines forms a parallel power supply for the control host 10 and a plurality of slaves 30. During the actual wiring operation, the shape of the wire body can be three wires, namely: a single communication bus 21, a positive power line 22, and a negative power line 23; it can also be two wires, namely: a single communication bus 21, a positive power line 22, and a negative power line 23 are combined into one wire; it can also be one wire, namely: a single communication bus 21, a positive power line 22, and a negative power line 23 are combined into one wire (such as Figure 6The wire joining method for the center wire body 26 can be customized during production or by wrapping two or three wires together using tape or other external materials during installation. All slave devices 30 can be configured with a three-wire interface (three pins: power +, power -, and a bidirectional communication line) in the form of a three-wire plug and a three-wire socket. This facilitates detachable connection between the slave device 30 and the first communication control interface 211 and the first power supply interface 24, facilitating installation, removal, and maintenance.

[0068] Several slaves 30 are connected in parallel to a control host 10. Each slave is a single-bus controlled actuator. An intelligent control board is equipped with an intelligent processing chip (MCU), which can identify commands, data waveforms, and other signals sent by the control host 10. The intelligent control board controls the actuators of each slave 30 based on signals from the control host 10. Furthermore, the intelligent control board contains a unique ID number for each slave 30 (all slaves 30 in a network connected to the same control host 10 have different unique ID numbers, and the intelligent control board has internal storage to store this unique ID number and other parameters). This serves as the network identifier for each slave 30 when communicating with the control host 10. This allows the intelligent control board to identify signals sent by the control host 10 and determine whether the control host 10 is communicating with the slave 30 based on the signal content (determining whether to associate the unique ID number with the slave 30). When the control host 10 sends communication commands, it can communicate independently with each slave 30, or simultaneously broadcast and control the actions of multiple slaves 30.

[0069] The control host 10 initiates a communication command (usually a communication command is preceded by one or more unique ID identification numbers, which may also be referred to as address codes), and several slaves 30 respond together:

[0070] If the intelligent control board of the slave 30 recognizes that the communication instruction is related to the slave 30, it will process it accordingly. If the intelligent control board of the slave 30 recognizes that the communication instruction is related to the slave 30, and based on the communication instruction, the slave 30 needs to send data to the control host 10, the intelligent control board of the slave 30 will first configure the transmission circuit so that the control host 10 relinquishes bus control. The slave 30 then performs uplink communication with the control host 10 via the single communication bus 21. After the communication is completed, the slave 30 configures the transmission circuit to restore bus control to the control host 10. If the intelligent control board of the slave 30 recognizes that the communication instruction is not related to the slave 30, it will no longer respond to the subsequent content of the communication instruction from the control host 10 until it receives the next new instruction content from the control host 10. Typically, the control host 10 is responsible for controlling the communication rhythm of several slaves 30, that is, each communication is initiated by the control host 10 and all slaves 30 respond. During the slave 30 response process, if the content of the communication instruction has been interpreted as irrelevant to the slave 30, the slave 30 will no longer interpret and respond to the subsequent content of the communication instruction from the control host 10 until it receives a new communication instruction from the control host 10. To prevent changes in the single communication bus 21 driven by other slaves 30 in response to the control host 10 from being identified as communication instructions from the control host 10, the slave 30 does not interpret or process the content received on the single communication bus 21 during the avoidance period specified in the protocol. If the intelligent control board of the slave 30 recognizes that the communication instruction is irrelevant to the slave 30, the slave 30 will not recognize the content sent from the single communication bus 21 during the set avoidance period; the avoidance period is at least greater than the time required for continuous signal transmission on the single communication bus 21 due to other slaves 30 receiving the communication instruction. For example, in a communication protocol, a control host 10 may issue a communication instruction requiring a slave 30 to transmit multiple bytes of data to the control host 10. At a given communication rate, the required duration is T1, during which time continuous signal transmission occurs on a single communication bus 21. Therefore, the idle time is defined as a duration greater than the time required for signal transmission on that single communication bus 21 to complete, allowing the slave 30 to respond to the next communication instruction from the control host 10. Specifically, based on the slave 30's estimated data transmission time under the communication instruction, a built-in timer is activated. During the timer's activation, the slave 30 no longer recognizes (or interprets) or responds to subsequent data transmitted from the single communication bus 21.

[0071] It should be noted that the intelligent electric bed electronic control system is scalable and may also include other functional execution units or sensors according to the functional upgrade of the bed, such as overcurrent and overtemperature protection, operating current detection, self-posture detection, bedside purification air supply, etc., but it must comply with the electrical specifications of the above-mentioned single communication bus 21 communication to communicate with the control host 10 and execute its own functions.

[0072] Combine Figure 8 As shown in the figure, the communication process logic of the intelligent electric bed electronic control system is as follows:

[0073] 1. Each communication is initiated by the control host 10; when the control host 10 initiates a communication instruction, the communication instruction is transmitted to all slaves 30 via the single communication bus 21;

[0074] 2. Several slaves 30 respond together: Identify whether the communication instruction contains the unique ID number of the slave 30;

[0075] 2-1. If the instruction is related to the slave 30, the slave 30 will continue to process the instruction according to its content. For example, the slave 30 will receive the instruction and control the corresponding actuator of the slave 30 according to the instruction. If the slave 30 needs to send data to the control host 10 based on the communication instruction, the slave 30 will first set the sending circuit to make the control host 10 give up the bus control right. The slave 30 will then communicate uplink with the control host 10 via the single communication bus 21. After the communication is completed, the slave 30 will set the sending circuit to restore the bus control right of the control host 10.

[0076] 2-2. If not recognized, the slave 30 will not recognize the content sent by the single communication bus 21 within the set avoidance time; when the avoidance time is up, the slave 30 will be restarted to respond to the next communication instruction state of the control host 10.

[0077] Combine Figure 4 and Figure 5 As shown, the control host 10 is provided with a first communication circuit 12, and the host MCU 13 of the control host 10 is connected to the control output port 11 via the first communication circuit 12. The slave 30 is provided with a communication circuit for communicating with the control host 10. Taking a single-bus controlled push rod as an example, its communication circuit is a second communication circuit 46. In actual design, the specific circuit can have many variations. In this embodiment, a detailed circuit form is provided for each of the first communication circuit 12 and the second communication circuit 46. The circuit structure design is ingenious and reasonable to ensure the stability and reliability of communication. However, Figure 5 and Figure 6 The detailed circuit shown is not intended to limit the circuit design of the control host 10 and the slave 30 of the present invention.

[0078] like Figure 4 As shown, the first communication circuit 12 includes a resistor R3, a resistor R1, a resistor R66, a resistor R67, a resistor R4, a resistor R181, a resistor R21, a resistor R7, a diode D4, a transistor Q10, a first operational amplifier and a second operational amplifier; the resistor R3 and the resistor R1 are connected in series, the non-series node of the resistor R3, the emitter of the transistor Q10 and the pin 4 of the first operational amplifier are all grounded, the non-series node of the resistor R1 and the pin 8 of the first operational amplifier are both used to connect to the 5V voltage end, the series node of the resistor R3 and the resistor R1 is connected to the pin 3 of the first operational amplifier, one end of the resistor R66 is used to connect to the TX pin of the control host 10, the other end of the resistor R66 and the collector of the transistor Q10 are both connected to the pin 2 of the first operational amplifier, one end of the resistor R67 is used to connect to the EN pin of the control host 10, and the other end of the resistor R67 is connected to the transistor Q10. The base of the transistor Q10 is connected to the emitter of the transistor Q10 through the resistor R68, the resistor R21 and the resistor R7 are connected in series, the pin 1 of the first operational amplifier is connected to the non-series node of the resistor R21, the series node of the resistor R21 and the resistor R7 is a signal end of the first communication circuit 12, the series node of the resistor R21 and the resistor R7 is connected to the pin 1 of the first interface 13, the cathode of the diode D4 is connected to the series node of the resistor R21 and the resistor R7; the resistor R4 and the resistor R18 are connected in series, the non-series node of the resistor R18 is used to connect to the 5V voltage end, the non-series node of the resistor R4 and the positive electrode of the diode D4 are both grounded, the series node of the resistor R4 and the resistor R18 is connected to the pin 5 of the second operational amplifier, the pin 6 of the second operational amplifier is connected to the non-series node of the resistor R7, and the pin 7 of the second operational amplifier is used to connect to the RX pin of the control host 10. Pin 3 of the first interface 13 is grounded via a diode D100. The cathode of the diode D100 is connected to pin 3 of the first interface 13, and the anode of the diode D100 is grounded. In this embodiment, the resistor R66, the first operational amplifier, the resistor R3, the resistor R1, and the resistor R2 constitute a transmitting circuit of the first communication circuit 12, and the second operational amplifier, the resistor R4, the resistor R181, and the resistor R7 constitute a receiving circuit of the first communication circuit 12.

[0079] like Figure 5 As shown, the sending circuit includes a transistor Q2, a resistor R15 and a resistor R17; the base of the transistor Q2 is connected to the MCU through the resistor R15, and the base of the transistor Q2 is also connected to the emitter of the transistor Q2 through the resistor R17, the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the first communication control interface.

[0080] The receiving circuit includes a transistor Q1, a resistor R14, a resistor R18, a resistor R16 and a capacitor C9; the base of the transistor Q1 is connected to the first communication control interface through the resistor R14, and the base of the transistor Q1 is also connected to the emitter of the transistor Q2 through the resistor R16. The emitter of the transistor Q1 is grounded, the capacitor C9 and the resistor R16 are connected in parallel, one end of the resistor R18 is used to connect to the 3.3V voltage terminal, and the other end of the resistor R18 is connected to the collector of the transistor Q1, and the collector of the transistor Q1 is connected to the MCU.

[0081] The second communication circuit 46 further includes a diode VD3, a resistor R13, a capacitor C6, a diode VD1, a resistor R9, a diode VD2, a capacitor C5, a step-down chip V1 and a capacitor C7. Figure 7 As shown, the third communication circuit 55 further includes a resistor R2, a diode D2, a diode D1, a capacitor C3, and a capacitor C4.

[0082] Next, based on Figure 4 and Figure 5 The communication circuit shown introduces the communication process logic:

[0083] 1. Each communication is initiated by the control host 10;

[0084] 2. Control host 10 to start its TX pin output, which is normally high voltage, such as Figure 4 As shown, the output of the corresponding first operational amplifier is high level; the first slave 30 and the second slave 30 connected to all buses also receive a low voltage in normal state;

[0085] 3. The IN network tag of the second communication circuit is at a low voltage when the control host 10 is in normal state. When the control host 10 starts to output serial port data, the start bit is first and then the other bits. At this time, after conversion by the corresponding transistors of the first slave 30 and the second slave 30, the INR network tags of the first slave 30 and the second slave 30 receive the standard serial port signal output by the control host 10.

[0086] 4. After the intelligent control board of the first slave 30 or the second slave 30 recognizes the data transmitted from the single communication bus 21, it performs corresponding data processing:

[0087] A. If the ID number (also referred to as the address code) sent by the control host 10 is the one that controls the slave 30, the corresponding processing is performed; usually, the serial port sending pin is Figure 6 The Send network tag is normally at a low voltage. When receiving an instruction from the control host 10 via the single communication bus 21 and needs to return data to the control host 10, the Send network tag first outputs a high voltage normally, and then outputs the serial port signal normally after maintaining it for a period of time.

[0088] B. If the control host 10 sends a data instruction to another slave 30, the slave 30 estimates the required data transmission time according to the instruction, and the built-in timer starts. During the startup period, the slave 30 will no longer recognize and respond to subsequent data transmitted from the single communication bus 21.

[0089] In another embodiment, if Figure 12 As shown, a detailed circuit form is provided for the first communication circuit and the communication circuit of the slave 30. The circuit structure design is ingenious and reasonable to ensure the stability and reliability of communication. At the same time, when the slave sends a signal outward, the slave uses its own power supply to control the host's own power consumption.

[0090] like Figure 12 As shown, the sending circuit of the first communication circuit includes a resistor R3, a resistor R6, a transistor Q4, a resistor R1, a transistor Q1 and a diode D1;

[0091] The control host is connected to the base of the transistor Q4 through the resistor R3, the base of the transistor Q4 is connected to the emitter of the transistor Q4 through the resistor R6, the emitter of the transistor Q4 is grounded, the collector of the transistor Q4 is connected to the base of the transistor Q1, the base of the transistor Q1 is connected to the emitter of the transistor Q1 through the resistor R1, the emitter of the transistor Q1 is used to connect to the VCC1 voltage terminal, the collector of the transistor Q1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the control output port.

[0092] The receiving circuit of the first communication circuit includes a resistor R9, a resistor R11, a transistor Q7, a transistor Q5, a resistor R7, a resistor R12 and a resistor R16;

[0093] Resistor R11 and resistor R9 are connected in series, the non-series node of resistor R11 is connected to the control host, the series node of resistor R11 and resistor R9 is connected to the collector of transistor Q7, the non-series node of resistor R9 is used to connect to the 3.3V voltage terminal, the base of transistor Q7 and one end of resistor R7 are both connected to the collector of transistor Q5, the other end of resistor R7 is used to connect to the 3.3V voltage terminal, the base of transistor Q7 is connected to the first communication control interface, the base of transistor Q7 is also grounded through resistor R15, and the emitters of both transistor Q7 and transistor Q5 are grounded.

[0094] In another embodiment, if Figure 12 As shown, the sending circuit of the second communication circuit includes a resistor R4, a resistor R5, a transistor Q2, a resistor R2, a transistor Q3 and a diode D2;

[0095] The MCU is connected to the base of the transistor Q2 through the resistor R4, the base of the transistor Q2 is connected to the emitter of the transistor Q2 through the resistor R5, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the base of the transistor Q3, the base of the transistor Q3 is connected to the emitter of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is used to connect to the VCC2 voltage terminal, the collector of the transistor Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the first communication control interface.

[0096] In another embodiment, if Figure 12 As shown, the receiving circuit of the second communication circuit includes a resistor R13, a resistor R15, a transistor Q6, a transistor Q8, a resistor R8, a resistor R10 and a resistor R14;

[0097] Resistor R14 and resistor R10 are connected in series, the non-series node of resistor R14 is connected to the MCU, the series node of resistor R14 and resistor R10 is connected to the collector of transistor Q8, the non-series node of resistor R10 is used to connect to the 3.3V voltage terminal, the base of transistor Q8 and one end of resistor R8 are both connected to the collector of transistor Q6, the other end of resistor R8 is used to connect to the 3.3V voltage terminal, the base of transistor Q6 is connected to the first communication control interface, the base of transistor Q6 is also grounded through resistor R15, and the emitters of both transistor Q8 and transistor Q6 are grounded.

[0098] Combine Figure 9 and Figure 10 As shown, the communication method of the intelligent electric bed electric control system of the embodiment of the present invention is as follows:

[0099] The communication of the single communication bus 21 is a master-slave half-duplex communication, wherein the control host 10 has a serial voltage signal as the downstream, and the slave 30 has an OC gate type pull-down bus current as the upstream, so that the control output port 11 of the control host 10 has a low pulse signal.

[0100] from Figure 9 As can be seen from the figure, before the serial data is sent, the start bit of the control host 10 is at a low level, and after the serial data is sent, the stop bit is at a high level. The output of the control host 10 is 10100110, that is, 0xA6.

[0101] from Figure 10 As can be seen in FIG, after the instruction of the control host 10 is completed, the timing of reading the data sent by the slave device is entered, that is, the control host releases the control right at this time, and the slave device affects the bus level according to the bit to be transmitted.

[0102] After the slave detects the rising edge of the command from the control host 10, it delays one bit time, namely the start bit, and actively pulls down the potential of the single bus for the control host 10 to detect the feedback data ( Figure 10 The data to be fed back is: 01000101, which is 0x65). Figure 10 The middle dotted line indicates that the control host 10 is in the bus control right release state at this time. It should be noted that the end of the first byte sent by the slave is the start bit of the second byte.

[0103] The following is a brief description of the working principle of the push rod body measuring its own angle through the acceleration sensor:

[0104] like Figure 7 As shown, when the telescopic end of the push rod body is extended, the angle between the push rod body and the bed frame 42 will change, and the angle of the push rod body itself will also change. Therefore, the utility model is suitable for mechanical structures in which the angle of the push rod body itself will change when the telescopic end of the push rod body is extended.

[0105] The acceleration sensor senses the acceleration (i.e., the component of gravity on the X-axis or Y-axis) changes in the X and Y-axis directions in the intelligent control board, from which the change in the angle of the push rod body itself can be calculated, thereby indirectly calculating the angle change and stroke change of the bed board 41.

[0106] The actuator body calculates and stores the initialization coefficients according to the following processing method. The steps are as follows:

[0107] The push rod body 51 is driven to position 1 (generally the lowest position of the telescopic end of the push rod body, i.e., zero position), and the main control chip records the three-axis acceleration (x1, y1, z1) value of the acceleration sensor at this moment.

[0108] The push rod body 51 is driven to position 2 (which may be the highest position of the telescopic end of the push rod body), and the main control chip records the three-axis acceleration (x2, y2, z2) values ​​of the acceleration sensor at this moment.

[0109] Calculate the two position differences of the intelligent control board, namely the difference between x1 and x2, and the difference between y1 and y2.

[0110] The angle difference between the two positions is calculated or measured as the extension result m of the telescopic end 511 of the push rod body 51 , and the coefficients k and b can be calculated using the simple equation m=kn+b.

[0111] Next, according to the instructions of the control host, the acceleration sensor value at the target position can be calculated based on the coefficients k and b obtained above, and the push rod body can be driven to extend and retract based on this target.

[0112] The above description illustrates one method for calculating the mechanical position of the push rod body and the bed frame it drives. In practice, coefficients can be derived based on the actual mechanical position relationship and directly incorporated into the program. This allows the position of the push rod body to be identified and the angle of the bed frame 62 driven to achieve control.

[0113] Therefore, the acceleration sensor is used to identify the posture of the push rod body. After the MCU calculates the posture of the push rod body, it can deduce the angle of the driven bed board 61 based on the mechanical position relationship between the push rod body and the bed frame 62, facilitating the host computer's control of the intelligent bed's angle. In addition to calculating the angle and driving the push rod motor chip, the MCU can also monitor parameters such as the push rod motor's drive current and operating temperature to ensure the safe use of the push rod motor and bed components.

[0114] The design focus of the utility model is that it mainly realizes single bus communication between the control host and the push rod, realizes intelligent control of the push rod, and also reduces the wiring cost of the push rod;

[0115] Secondly, the intelligent control board is set on the push rod body. The built-in MCU of the intelligent control board reads the acceleration sensor value and calculates the rotation angle of the push rod body, making the method of measuring the rotation angle of the push rod simple.

[0116] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A single bus controlled push rod, characterized in that: Includes: A push rod body; the push rod body is connected to a push rod motor; An intelligent control board; the intelligent control board is provided with an MCU and a motor driver chip and an acceleration sensor respectively connected to the MCU; the MCU is connected to a second communication control interface and a second power supply interface; the second communication control interface is used to connect to the first communication control interface on a single communication bus; the second power supply interface is used to connect to the first power supply interface on a group of power lines; The motor driving chip is connected to the push rod motor.

2. The single bus controlled push rod according to claim 1, characterized in that: The push rod motor is connected to the push rod body through a push rod transmission assembly.

3. The single bus controlled push rod according to claim 1, characterized in that: The telescopic end of the push rod body is used for pivoting with the bed board, the fixed end of the push rod body is used for pivoting with the bed frame, and the intelligent control panel is arranged on the push rod body.

4. The single bus controlled push rod according to claim 1, characterized in that: The intelligent control board is also provided with a communication circuit for communicating with the control host, and the communication circuit is connected to the second communication control interface.

5. The single bus controlled push rod according to claim 4, characterized in that: The communication circuit includes a sending circuit and a receiving circuit. The receiving circuit is used to convert the signal on the single communication bus into a signal that can be recognized by the intelligent control board. The sending circuit is used to convert the signal sent by the intelligent control board of this slave machine into a bus signal, which is transmitted via the single communication bus for recognition and processing by the control host.

6. The single bus controlled push rod according to claim 1, characterized in that: The intelligent control panel is also provided with a display screen, and the MCU is connected to the display screen.

7. The single bus controlled push rod according to claim 5, characterized in that: The transmitting circuit includes a transistor Q2, a resistor R15 and a resistor R17; The base of the transistor Q2 is connected to the MCU via the resistor R15 , and the base of the transistor Q2 is further connected to the emitter of the transistor Q2 via the resistor R17 . The emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the first communication control interface.

8. The single bus controlled push rod according to claim 5, characterized in that: The receiving circuit includes a transistor Q1, a resistor R14, a resistor R18, a resistor R16 and a capacitor C9; The base of the transistor Q1 is connected to the first communication control interface through the resistor R14. The base of the transistor Q1 is also connected to the emitter of the transistor Q2 through the resistor R16. The emitter of the transistor Q1 is grounded. The capacitor C9 and the resistor R16 are connected in parallel. One end of the resistor R18 is used to connect to the 3.3V voltage terminal. The other end of the resistor R18 is connected to the collector of the transistor Q1, and the collector of the transistor Q1 is connected to the MCU.

9. The single bus controlled push rod according to claim 5, characterized in that: The transmitting circuit includes a resistor R4, a resistor R18, a transistor Q2, a resistor R2, a transistor Q3 and a diode D2; The MCU is connected to the base of the transistor Q2 through the resistor R4, the base of the transistor Q2 is connected to the emitter of the transistor Q2 through the resistor R18, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the base of the transistor Q3, the base of the transistor Q3 is connected to the emitter of the transistor Q3 through the resistor R2, the emitter of the transistor Q3 is used to connect to the VCC2 voltage terminal, the collector of the transistor Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the first communication control interface.

10. The single bus controlled push rod according to claim 5, characterized in that: The receiving circuit includes a resistor R13, a resistor R15, a transistor Q6, a transistor Q8, a resistor R14, a resistor R10 and a resistor R8; Resistor R14 and resistor R10 are connected in series, the non-series node of resistor R14 is connected to the MCU, the series node of resistor R14 and resistor R10 is connected to the collector of transistor Q8, the non-series node of resistor R16 is used to connect to the 3.3V voltage terminal, the base of transistor Q8 and one end of resistor R8 are both connected to the collector of transistor Q6, the other end of resistor R8 is used to connect to the 3.3V voltage terminal, the base of transistor Q6 is connected to the first communication control interface, the base of transistor Q6 is also grounded through resistor R15, and the emitters of both transistor Q8 and transistor Q6 are grounded.

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