Intelligent lifting table control system based on Type-C interface power supply

Abstract

The invention discloses an intelligent lifting table control system based on Type-C interface power supply, and belongs to the technical field of smart home. The system comprises a Type-C interface, a power management module, a DC-DC conversion module, a dual-power control module, an MCU, a main and auxiliary power switching module and a motor driving module. The system adopts a Type-C interface as an external power supply interface, negotiates with an external power supply through a power transmission protocol, and obtains power supply input; the DC-DC conversion module is used for converting input voltage into specific voltage required by each module; the dual-power-supply control module supports single-power-supply input or dual-power-supply input of any port; the voltage and current detection module samples motor input voltage and current and feeds back the voltage and current to the MCU; the main and auxiliary power supply switching module is used for automatically switching a system power supply mode; and the MCU adjusts the motor driving signal. The lifting table control system does not depend on a special power supply any more, and the control cost of the lifting table is reduced.

Description

Technical Field

[0001] The present application belongs to the field of smart home technology, and specifically relates to a smart lifting table control system powered by a Type-C interface. Background Art

[0002] In the field of office furniture, the height-adjustable table is an innovative design that can flexibly adjust the height of the desktop according to the user's height and work needs, thereby providing a more comfortable and healthy working environment. However, traditional height-adjustable tables have certain limitations in the design of power supply methods, and usually require a designated power adapter for power supply. This method limits the portability and versatility of the device, causing users to face many inconveniences when using it in different scenarios or locations. For example, when using it in different countries and regions, due to different power supply standards, it is necessary to purchase additional corresponding height-adjustable table adapters, which further increases the cost and difficulty of use for users.

[0003] With the rapid development of science and technology and the popularization of the concept of smart home, the interface standards of electronic devices are also constantly evolving. As a new generation of data and power transmission interface, the Type-C interface has gradually become a standard configuration for many electronic devices due to its high compatibility, reversible pluggable design and powerful power transmission capability. The widespread application of this interface standard has brought new opportunities for the power supply of office furniture such as lifting tables. Applying the Type-C interface to the power supply system of the lifting table can effectively solve the limitations of the traditional lifting table in power supply.

[0004] However, although the universality of the Type-C interface enables the lifting table to adapt to different power supply environments more conveniently, users no longer need to worry about the power supply standards of different countries and regions. However, since the control system of the lifting table needs to adjust the operating status of the motor according to the received instructions to realize the height adjustment, speed control and other functions of the lifting table, the power transmission capacity of the interface must meet the power requirements of the lifting table when adjusting the height to ensure the stable operation of the equipment, so there are high requirements for the power transmission capacity of the Type-C interface. On the other hand, when the input voltage of the external power supply is not fixed, the multiple voltages provided by the external power supply may not be able to well guarantee the working voltage required by each functional module in the lifting table control system, resulting in limited compatibility of the control system with the power supply. Therefore, there are still certain limitations in applying the Type-C interface to the power supply system of the lifting table. Summary of the invention

[0005] 1. Technical problem to be solved by the invention In view of the above-mentioned deficiencies in the prior art, the present application provides an intelligent lifting table control system powered by a Type-C interface. The present application establishes a physical connection with an external power supply through the Type-C interface. The internal power management module is responsible for negotiating with the external power supply through the PD protocol to obtain appropriate voltage and current input. The internal DC-DC conversion module converts the received voltage into the specific voltage required for the operation of each functional module of the lifting table control system, thereby realizing that the lifting table control system no longer relies on a special power supply, and the cost of lifting table control is reduced accordingly.

[0006] 2. Technical solution In order to achieve the above objectives, the technical solution provided by this application is: The present application discloses a smart lifting table control system based on Type-C interface power supply, including Type-C interface, power management module, dual power control module, DC-DC conversion module, main and auxiliary power switching module, controller MCU, voltage and current detection module and motor drive module, wherein: The female socket of the Type-C interface is used to detect the connection status of the Type-C interface, and all ports of the female socket are connected to the power management module; The power management module is used for power distribution and management from the Type-C interface to the entire control system; The dual power control module can support single power input or dual power input from any port of the front stage to supply power to the back stage circuit; The DC-DC conversion module is used to convert the DC voltage provided by the power supply into the DC voltage required by the subsequent circuit; The voltage and current detection module monitors the input voltage and current of the motor in real time and transmits the data to the controller MCU; The motor drive module is used to convert the DC power supply into an input signal suitable for the motor to work, and adjust the input power of the motor by controlling the pulse duty cycle; The main and auxiliary power switching modules are used to automatically switch the system power supply mode; The controller MCU achieves height adjustment and intelligent control of the lifting table by receiving and processing information from user input, sensor data and other system components.

[0007] 3. Beneficial effects Compared with the existing known technologies, the technical solution provided by this application has the following significant effects: (1) The present application discloses a smart lifting table control system powered by a Type-C interface, which is connected to an external power supply through the Type-C interface. The power management module negotiates the PD protocol with the power supply to obtain appropriate voltage and current input. Since the input voltage of the external power supply is not fixed (5V, 9V, 12V, 20V, etc.), the DC-DC conversion module can convert the various voltages provided by the external power supply into the working voltage required by each functional module, further improving the control system's compatibility with the power supply.

[0008] (2) The present application discloses an intelligent lifting table control system powered by a Type-C interface, in which a voltage and current detection module is provided to monitor the input voltage and current of the motor in real time, and transmit the data to the MCU to implement undervoltage, overcurrent and other protections. The MCU issues control instructions to the motor drive module based on the received data and the instructions sent by the user through the hand controller. The motor drive module adjusts the operating state of the motor according to the control instructions of the MCU to implement functions such as height adjustment and speed control of the lifting table. The EEPROM memory records and stores the operating parameters and user preference settings of the lifting table so as to restore the user's last usage status after the device is restarted. The various functional modules of the control system work together to achieve that the lifting table control system no longer relies on a special power supply, and the control cost of the lifting table is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A structural block diagram of a smart lifting table control system powered by a Type-C interface provided in Example 1 of the present application; Figure 2 A structural block diagram of a smart lifting table control system powered by a Type-C interface provided in Example 2 of the present application; Figure 3 This is the circuit diagram of the Type-C interface in this application; FIG. 4 (a) and FIG. 4 (b) are circuit diagrams of the power management module in the present application; Figure 5 A circuit diagram of a dual power supply control module in this application; Figure 6 A circuit diagram of a DC-DC conversion module in this application; Figure 7 This is a circuit diagram of the motor drive module in this application; FIG8 (a) and FIG8 (b) are circuit diagrams of the voltage and current detection module in the present application; Fig. 9 This is a flow chart of motor speed adjustment for different power supplies in this application; Fig.10 This is a circuit diagram of the main and auxiliary power switching module in this application. DETAILED DESCRIPTION

[0010] The present application discloses a smart lifting table control system based on Type-C interface power supply, which supports power supply based on USB PD protocol to power the lifting table. Figure 1 As shown, the control system includes: Type-C interface, power management module, DC-DC conversion module, microcontroller MCU, EEPROM memory, voltage and current detection module, motor drive module and hand controller.

[0011] The Type-C interface design includes a Type-C female socket and necessary resistors for detecting the connection status of the Type-C interface. All ports of the female socket are directly connected to the power management module to ensure stable power supply.

[0012] The power management module integrates a linear voltage regulator circuit, a clock circuit, and a power chip U2 with a built-in USB PowerDelivery (USB PD) protocol. In the linear voltage regulator circuit, U1 is responsible for steadily reducing the voltage input from the VBUS pin of the Type-C interface (which may be 5V, 9V, 12V or 20V, etc., depending on the support of the power supply device) to the operating voltage range required by the power chip U2. The input end of U1 is directly connected to the VBUS and GND pins of the Type-C interface to ensure stable power input, while its output port is connected to the VDD and VSS pins of the power chip U2 to provide a stable operating voltage for the chip. At the same time, the clock circuit is composed of a crystal oscillator and a capacitor to provide an accurate working clock signal for the power chip to ensure the correct operation of the internal logic. The power chip U2 negotiates with the power supply through the built-in USB PD protocol to dynamically adjust the power output suitable for the current system requirements, thereby realizing efficient and stable distribution and management of power from the Type-C interface to the entire lifting table control system.

[0013] The DC-DC conversion module is responsible for converting the DC voltage provided by the power supply into the DC voltage required by the subsequent circuit. Due to the uncertainty of the previous input voltage, the DC-DC conversion module needs to maintain the preset value of the subsequent output voltage when the previous input voltage is greater than or less than the output voltage. In order to achieve this goal, the present application integrates a boost / buck switching power supply controller inside the DC-DC conversion module. The controller can timely convert the switching power supply topology according to the change of the input voltage to ensure that the subsequent output voltage can be stabilized within a preset range. At the same time, in order to reduce the ripple and noise that may be generated during the voltage conversion process, the module is also equipped with various types of capacitors and inductors to make the output voltage smoother and more stable.

[0014] The motor drive module is responsible for converting the DC power supply into an input signal suitable for the motor to work, and adjusting the input power of the motor by precisely controlling the pulse duty cycle. This function ensures that the motor can maintain a constant operating speed under different load conditions, thereby providing a stable and smooth lifting experience. Specifically, when the DC power supply is input to the motor drive module, it is first converted into a high-frequency pulse signal, a process usually referred to as "chopping". Subsequently, by precisely adjusting the duty cycle of these pulse signals, the motor drive module can control the average voltage and current received by the motor, thereby adjusting the input power of the motor. Since the lifting table may encounter different load conditions during use, such as changes in the weight of items placed on the desktop, these changes will directly affect the operation of the motor. Use PWM modulation to quickly adjust the motor input power to keep the motor at a constant speed.

[0015] The microcontroller MCU is the core control unit in the control system of the lifting table. It realizes the height adjustment and intelligent control of the lifting table by receiving and processing information from user input, sensor data and other system components. Its working principle includes initialization and configuration, input reception and processing, sensor data collection, decision-making and control, feedback and protection, etc., which together constitute the intelligent control system of the lifting table system.

[0016] In order to further understand the content of the present application, the present application is described in detail with reference to the accompanying drawings and embodiments.

[0017] Example 1 The working principle of the lifting table control system based on Type-C interface power supply in this embodiment is as follows: The system uses the Type-C interface as the standard interface with the external power supply, and uses the built-in PD protocol of the power management chip to negotiate with various external power supplies to ensure that the control system has a stable power supply. Inside the system, the DC-DC conversion module can accurately convert the input voltage into the specific voltage required by each functional module to ensure that all components of the system can operate efficiently and stably. The user sends operating instructions through the hand controller, and the MCU controls the motor drive module according to the instructions to achieve precise adjustment of the height of the lifting table. At the same time, the voltage and current detection module monitors the working status of the motor in real time, and feeds back the information to the MCU in real time. The MCU analyzes the operating status of the motor and takes necessary protection measures when an abnormality occurs to ensure the safe and stable operation of the system. In addition, the system is also equipped with an EEPROM memory to record the user's preference settings and the operating parameters of the device to ensure that the data is not easily lost after the device is powered off.

[0018] See also Figure 3The Type-C interface includes 4 resistors R1~R4 and 1 Type-C socket. Resistors R1 and R3 are connected in series, and resistors R2 and R4 are connected in series. One end of resistors R3 and R4 is connected to GND, and the other end is connected to the two CC ports of the Type-C socket. The Type-C interface detects the device's insertion status, insertion direction, and supported functional modes through the built-in CC pin, combined with the voltage and resistance measurement mechanism. When the device is inserted, the voltage change on the CC pin triggers the detection process, and the insertion direction is determined by the voltage value on the CC pin.

[0019] As shown in FIG. 4 (a) and FIG. 4 (b), the power management module designed in this embodiment includes three parts: a linear voltage regulator circuit, a clock circuit, and a power chip U2. Among them, the linear voltage regulator circuit is an important component of the power management module, which is responsible for stably converting the voltage from the VBUS terminal of the Type-C interface into the working voltage required by the power chip U2. Capacitor C1 is connected in parallel to the input end of the low-voltage difference linear regulator U1 in the linear voltage regulator circuit as a decoupling capacitor. Its main function is to weaken the AC noise and transient changes on the power line and ensure the stability of the input voltage. Capacitors C2~C4 are connected in parallel to the output end of the low-voltage difference linear regulator U1 as filter capacitors. Their function is to reduce the AC ripple on the output voltage and make the output voltage smoother. The low-voltage difference linear regulator U1 is the core component of the linear voltage regulator circuit. It converts the higher voltage from the VBUS terminal into a low voltage suitable for the power chip U2. Resistor R5 is a current limiting resistor, which is connected in series with the LED lamp D1 and then connected in parallel to the output end of the low-voltage difference linear regulator U1. This design can limit the current passing through the LED to prevent the LED from being damaged due to excessive current. At the same time, the LED light D1 can also serve as an indicator of the power status. The clock circuit is composed of a resonant circuit composed of a crystal oscillator Y1 and capacitors C5 and C6, which provides a stable clock signal for the power chip U2. The power chip U2 establishes a communication link with the external power supply through the I / O ports UDP and UDM, and negotiates with the external power supply through the built-in power transmission protocol (such as USB Power Delivery, PD) to obtain the power supply required for the entire system to work.

[0020] like Figure 6 As shown, the DC-DC conversion module designed in this embodiment mainly includes two parts: a step-up / step-down switching voltage regulator circuit and a switching voltage regulator circuit. Among them: The boost / buck switching regulator circuit (mainly including the control chip U4 and peripheral circuits) ensures that the system can stably output the required voltage under different input voltage (VBUS) conditions. When the input voltage VBUS is higher than the required output voltage, the control chip U4 will control the external circuit to operate in a BUCK (step-down) topology, acting as a buck regulator to reduce the voltage to the set value. In this mode, the switch tube Q1 is turned on during the positive cycle of the modulation signal, transferring energy from the input end to the output end, and maintaining the stability of the output voltage through inductor energy storage and capacitor filtering. When the input voltage VBUS is close to or lower than the required output voltage, the control chip U4 will respond quickly and adjust the control strategy, gradually transitioning to BOOST (boost) mode. In boost mode, the switch tubes Q1 and Q2 are turned on during the positive cycle of the modulation signal, extracting energy from the input end and storing it in the inductor, and then releasing the stored energy to the output end during the negative cycle, and obtaining an output voltage higher than the input voltage after capacitor filtering. This dynamic conversion ensures that the output voltage can be maintained at a preset stable value regardless of how the input voltage changes, thus meeting the strict requirements of the height-adjustable table control system for power supply stability.

[0021] In the present embodiment, capacitor C15 is connected to VBUS and GND as a decoupling capacitor. The VIN port of the control chip U4 is directly connected to VBUS as a chip power supply port. The UVLO of the control chip U4 is an undervoltage protection port. When the UVLO port voltage is lower than the built-in reference voltage, the control chip U4 will enter the standby state until the port voltage returns to normal. Resistors R10, R11 and capacitor C16 constitute a sampling circuit for the input voltage VBUS and are connected to the port UVLO. By adjusting the resistance values ​​of resistors R10 and R11, the undervoltage threshold can be flexibly changed. The RT port of the control chip U4 controls the frequency of the PWM modulation wave, and is adjusted by the resistance value of the external resistor R12 to better adapt to the post-stage power circuit. The EN terminal of the control chip U4 is the controller enable terminal. When the port voltage is lower than the threshold, the controller will enter the low power mode, and it can work normally only when the port voltage is higher than a certain value. In the present embodiment, the controller is set to the enabled state for a long time, so the EN terminal is connected to VBUS, and R13 is a current limiting resistor.

[0022] The RAMP port of the control chip U4 realizes the ramp amplitude adjustment inside the controller through the external capacitor C17. The AGND pin of the control chip U4 is an analog ground pin. In order to reduce the coupling degree between the external control loop and the external power loop of the controller and reduce the crosstalk between different loops, different ground ports are set for the two. The SS pin of the control chip U4 is a soft start port. During the startup process, the regulator gradually reaches the initial steady-state operating point, thereby reducing the stress and surge of each power device at startup. The internal soft start current source gradually charges the external soft start capacitor C18 connected to the SS pin. When the C18 capacitor is in a charging state, the FB pin voltage is approximately equal to the SS pin. Once the SS pin voltage exceeds the internal reference voltage of the controller, the duty cycle of the PWM modulation signal will be controlled by the reference voltage of the output sampling loop instead of the SS pin voltage. The FB of U4 is the output voltage feedback port. The sampling loop composed of resistors R15, R16 and capacitor C21 feeds the output signal back to the controller and compares it with the internal reference voltage of the controller, thereby stabilizing the output voltage in a certain range. The output voltage amplitude can be adjusted by adjusting the resistance values ​​of resistors R15 and R16. The COMP terminal of U4 is the output terminal of the error amplifier inside the controller. The VOUT terminal of U4 detects the output voltage, similar to the current control mode, and is connected to the output terminal to adjust the output voltage.

[0023] The SYNC terminal of U4 is the external clock input terminal, which is not used in this embodiment. The CS terminal and CSG terminal of U4 are current sampling input terminals, and resistor R19 converts the current into voltage and inputs it to the CS terminal. The PGND terminal of U4 is the GND port of the power loop. VCC and VCCX of U4 constitute the output voltage bias adjustment. Since they are not used in this embodiment, VCCX is directly connected to AGND. The HB and HS terminals of U4 enhance the driving ability of HO to the MOS tube Q1 through the internal circuit of the controller, and the capacitor C24 is a bootstrap capacitor connected to the HB and HS terminals. The HO terminal and LO terminal of U4 are respectively connected to the gates of the MOS tubes Q1 and Q2 to provide driving signals. When the input voltage is greater than the output voltage, the HO terminal outputs a PWM modulation wave, and the MOS tube Q1, the inductor L2, the diode D5, and the capacitor C28 are combined into a step-down switching power supply based on the BUCK topology. When the input voltage is less than the output voltage, the HO terminal and the LO terminal output the same PWM modulation wave, and the MOS tubes Q1, Q2, the inductor L2, the diode D5, and the capacitor C28 are combined into a boost switching power supply based on the BOOST topology. The diode D4 is a freewheeling diode, which provides a current loop for the inductor L2 when the MOS tubes Q1 and Q2 are all turned off.

[0024] In the power supply design of the lifting table control system, considering that the subsequent MCU circuit cannot directly use the voltage of the VBUS terminal and the requirements for voltage stability, if multiple outputs are directly performed through the buck-boost switch circuit, only the auxiliary output side can be used as the input voltage of the MCU circuit. Due to the lack of a direct feedback loop, the voltage ripple of the auxiliary circuit may be relatively large, which may interfere with the normal operation of the MCU. In addition, the buck-boost switch circuit with multiple outputs not only increases the complexity of the design, but may also bring additional costs and safety issues. Therefore, in order to simplify the design, reduce costs and ensure the power supply stability of the MCU circuit, it is necessary to adopt another simple structure and high efficiency voltage stabilization circuit as the MCU voltage stabilization power supply solution.

[0025] like Figure 6 In the switching voltage regulator circuit shown, capacitors C8 and C9 are used as decoupling capacitors. They are connected in parallel between VBUS and VIN of chip U3 to filter out the power supply noise in VBUS. The two ends of resistor R7 are connected to VBUS and EN of the power control chip respectively, which plays a role in current limiting. Capacitor C10 is a bootstrap capacitor connected to the SW and BST terminals of chip U3. L1 is a choke inductor, which plays a role in smoothing current and regulating output voltage. R8 and R9 are output voltage sampling feedback resistors. C11~C14 are output filter capacitors to reduce power supply ripple voltage.

[0026] like Figure 7 As shown, it is a schematic diagram of the specific implementation of the motor drive module in this embodiment, and the full-bridge drive circuit of the motor is composed of MOS tubes Q3, Q4, Q5, and Q6. The motor rotates clockwise: the TIM_CH1 channel inputs a PWM modulation signal with a duty cycle of D. When the signal is at a high level, the composite MOS tube composed of MOS tubes Q3 and Q5B is turned on, and the power supply voltage is directly transmitted to the M+ end of the DC motor. The signal of the TIM_CH4 channel is the same as that of TIM_CH1. At this time, the current starts from the positive pole of the power supply, flows into the M+ end of the motor through Q5B, then flows out from the M- end through the motor, and then returns to the negative pole of the power supply through the Q6A transistor. Controlling the size of the duty cycle D can adjust the motor input power, thereby controlling the motor speed and torque. Counterclockwise rotation: On the contrary, when the Q6B and Q5A transistors are turned on, the current starts from the positive pole of the power supply, flows into the M- end of the motor through the Q6BMOS tube, then flows out through the M+ end of the motor, and then returns to the negative pole of the power supply through the Q5A transistor. At this time, the direction of the current is from right to left. When driving the motor, it is necessary to ensure that the two MOS tubes on the same side of the full bridge are not turned on at the same time. If Q5A and Q5B are turned on at the same time, the current will directly pass through the two MOS tubes from the positive pole of the power supply to the negative pole, causing a short circuit in the circuit.

[0027] As shown in Figure 8 (a) and Figure 8 (b), the voltage and current detection module in this embodiment is mainly divided into two parts: the current sampling circuit and the voltage sampling circuit. In the current sampling circuit, the resistor R24 ​​converts the current signal into a voltage signal. In order to perform current sampling without affecting the normal operation of the motor, the resistance of the resistor R24 ​​is relatively small (the small resistance resistor generates a small additional voltage drop on the motor working current path). The two ends of the resistor R30 are respectively connected to the output end and the inverting input end of the operational amplifier to form a negative feedback loop, and form a common-phase proportional operational amplifier circuit with the resistors R26 and R28 (the amplification factor is jointly determined by the resistors R26, R28 and R30). Finally, the output signal is sent to the AD conversion circuit to convert the analog signal into a digital signal.

[0028] In the voltage sampling circuit, first, capacitor C42 is used as a power decoupling capacitor, and its main function is to reduce the noise and interference caused by the rapid switching of other circuit components on the power line. Next, capacitor C43 is used as a bypass filter capacitor to further filter out high-frequency noise and clutter on the signal path. Subsequently, resistors R32 and R33 form a voltage divider circuit. The function of this circuit is to proportionally reduce the high voltage to be sampled to an acceptable range for the operation circuit to protect the subsequent circuit from being damaged by high voltage. The voltage divider ratio is determined by the resistance values ​​of resistors R32 and R33. Finally, the voltage signal processed by the voltage divider is sent to the voltage follower. The main function of the voltage follower here is to provide high input impedance and low output impedance, thereby isolating the direct electrical connection between the sampling circuit and the subsequent AD conversion circuit to prevent mutual interference. Finally, the voltage signal processed by the voltage follower is sent to the AD conversion circuit. The AD conversion circuit converts the analog voltage signal into a digital signal so that the MCU can further process, analyze and store this information.

[0029] like Fig. 9 As shown in the figure, the MCU obtains the rated output power information of the external power supply through the power management module. During the operation of the motor, the system samples the voltage and current of the motor to accurately calculate the power of the motor in the current operating state. When it is detected that the motor power exceeds 95% of the rated power of the external power supply, the control system will use PWM modulation technology to change the duty cycle of the input signal of the motor drive circuit to gradually decelerate the motor to ensure that the motor operates within a safe and stable range. On the contrary, when the power is sufficient, the current speed of the motor is lower than the preset speed value, and the control system will use PWM modulation technology to gradually accelerate the motor until the motor speed reaches the predetermined target speed and maintains a constant speed.

[0030] Example 2 Combination Figure 2In order to obtain more complete functions, the lifting table control system based on Type-C interface power supply in this embodiment, on the basis of Example 1, adds a dual power control module and a main-slave power switching module, and sets two Type-C interfaces to connect to the external power supply. The two Type-C interfaces are respectively connected to the power management module, and the power management module realizes efficient and stable distribution and management of electric energy from the Type-C interface to the entire lifting table control system.

[0031] The dual power supply control module can support single power supply input or dual power supply input at any port of the front stage to power the rear stage circuit, and mainly includes a dual power supply control circuit and a voltage integral comparison circuit. The dual power supply control circuit is responsible for outputting the dual power supplies in series to the DC-DC module so that the DC-DC module can obtain a larger input power. The voltage integral comparison circuit is connected in parallel at both ends of the input power supply to detect changes in the power supply voltage. Considering that when the user uses two external power supplies, there may be a large difference in the rated output power of the two external power supplies. When the load of the lifting table is large, the power supply with a small rated power will gradually develop from the original constant voltage area to the constant power area and the constant current area. This process may cause damage to the power supply. The voltage integral comparison circuit detects the amplitude of the power supply voltage change and compares it with the reference voltage. When the power supply is separated from the constant voltage area, the power supply is disconnected from the series circuit.

[0032] The main-sub power switching module regards the external power supply as the main power supply and the battery inside the system as the secondary power supply. When the external power supply is connected to the system, the external power supply is used to power the various modules of the system; when the external power supply is withdrawn, in order to enable the system to work normally in a short time, the battery is used to power the system.

[0033] like Figure 5 As shown, the dual power control module designed in this embodiment includes two parts: a dual power control circuit and a voltage integral comparison circuit. VBUS1 and VBUS2 represent two external input power supplies respectively. Q7 and Q8 are switch MOS tube control power supplies to supply power to the subsequent circuit. D6, R35, C44 and D7, R36, C45 form a bootstrap circuit to maintain the stability of the MOS tube switch state. Diodes D8 and D9 ensure that they can still work normally when a single power supply is input. R37, R38 and R40, R41 are voltage divider resistors. R39, U6A and R42, U7A form a voltage follower. R43, R45, R46, C46, ​​U6B and R44, R47, C47, R48, U7B form an integral operation circuit to perform integral operation on the power supply voltage. U6C and U7C are comparison operators that compare the integral result with the reference voltage and output the control signals S1 and S2 of the MOS tube.

[0034] like Fig.10As shown, when the external power supply is connected, Q10 and Q11 are turned on and Q9 is turned off. The external power supply VBUS powers the modules of the system, and U9 and surrounding components form a constant current source to charge the battery. Among them, capacitors C52, C53, C55, and C56 are filter capacitors, C54 is a bootstrap capacitor, L4 is a choke inductor, D11 is a voltage-regulating diode, and R53 and R54 are voltage-dividing sampling resistors to detect the battery charge level and feed it back to U9. When the external power supply is removed, MOS tube Q9 is turned on, Q10 and Q11 are turned off, U8 and surrounding components form a voltage converter, and the battery UBAT is used to power the modules of the system. Among them, capacitors C48, C49, C50, and C51 are filter capacitors, L3 is a choke inductor, D10 is a voltage-regulating diode, and R49 and R50 are voltage-dividing sampling resistors.

[0035] The above is a schematic description of the present application and its implementation methods, which is not restrictive. The drawings show only one implementation method of the present application and are not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an implementation method similar to the technical solution without creativity without departing from the inventive purpose of the present application, they should all fall within the protection scope of the present application.

Claims

1. A smart lifting table control system based on Type-C interface power supply, characterized in that: It includes Type-C interface, power management module, DC-DC conversion module, controller MCU, voltage and current detection module, motor drive module, dual power control module and main and auxiliary power switching module, among which: The Type-C interface is provided with two, and both Type-C interfaces are connected to an external power supply; and the two Type-C interfaces are respectively connected to a power management module, and the female socket of the Type-C interface is used to detect the connection status of the Type-C interface, and all ports of the female socket are connected to the power management module; The power management module is used for power distribution and management from the Type-C interface to the entire control system; The power management module is connected to the dual power control module, and the dual power control module can support single power input or dual power input from any port of the front stage to supply power to the back stage circuit; The DC-DC conversion module is used to convert the DC voltage provided by the power supply into the DC voltage required by the subsequent circuit; The dual power control module is connected to the main and auxiliary power switching modules via the DC-DC conversion module, and the main and auxiliary power switching modules are used to automatically switch the power supply mode of the system; The main and auxiliary power switching modules are connected to the controller MCU and the motor drive module respectively; The voltage and current detection module monitors the input voltage and current of the motor in real time and transmits the data to the controller MCU; The motor drive module is used to convert the DC power supply into an input signal suitable for the motor to work, and adjust the input power of the motor by controlling the pulse duty cycle; The controller MCU achieves height adjustment and intelligent control of the lifting table by receiving and processing information from user input, sensor data and other system components.

2. According to claim 1, a smart lifting table control system based on Type-C interface power supply is characterized in that: The power management module includes a linear voltage regulator circuit, a clock circuit and a power chip U2. The linear voltage regulator circuit is used to stably reduce the voltage input by the Type-C interface to the operating voltage range required by the power chip U2. The clock circuit provides an accurate working clock signal for the power chip U2 to ensure the correct operation of the internal logic; the power chip U2 negotiates with the power supply through a built-in protocol and dynamically adjusts the power output to suit the current system requirements.

3. According to claim 1, a smart lifting table control system based on Type-C interface power supply is characterized in that: The DC-DC conversion module includes a step-up / step-down switching voltage regulator circuit and a switching voltage regulator circuit. The step-up / step-down switching voltage regulator circuit is used to stably output the required voltage under different input voltage conditions; the switching voltage regulator circuit is used to provide a stable voltage for the subsequent MCU circuit.

4. According to claim 3, a smart lifting table control system based on Type-C interface power supply is characterized in that: The boost / buck switching regulator circuit includes a control chip U4 and peripheral circuits. When the input voltage VBUS is higher than the required output voltage, the control chip U4 controls the external circuit to operate in a BUCK topology structure, and acts as a buck regulator to reduce the voltage to a set value; when the input voltage VBUS is close to or lower than the required output voltage, the control chip U4 controls the external circuit to transition to a BOOST topology structure, and acts as a boost regulator to increase the voltage to a set value.

5. According to claim 4, a smart lifting table control system based on Type-C interface power supply is characterized in that: The switching voltage stabilizing circuit includes capacitors C8-C14, inductor L1, chip U3 and resistors R7-R9. Capacitors C8 and C9 are used as decoupling capacitors, and the two are connected in parallel between VBUS and VIN of chip U3. The two ends of resistor R7 are respectively connected to VBUS and EN end of chip U3, and capacitor C10 is connected to SW end and BST end of chip U3; L1 is a choke inductor connected to SW end of chip U3, resistors R8 and R9 are output voltage sampling feedback resistors; capacitors C11-C14 are output filter capacitors.

6. According to claim 1, a smart lifting table control system based on Type-C interface power supply is characterized in that: The motor drive module includes a full-bridge drive circuit composed of MOS tubes Q3, Q4, Q5, and Q6; the motor rotates clockwise: the TIM_CH1 channel inputs a PWM modulation signal with a duty cycle of D; when the signal is at a high level, the composite MOS tube composed of MOS tubes Q3 and Q5B is turned on, and the power supply voltage is directly transmitted to the M+ end of the DC motor. The signal of the TIM_CH4 channel is the same as that of TIM_CH1. At this time, the current starts from the positive pole of the power supply, flows into the M+ end of the motor through Q5B, then passes through the motor and flows out from the M- end, and then returns to the negative pole of the power supply through the Q6A transistor; the motor rotates counterclockwise: the Q6B and Q5A transistors are turned on, the current starts from the positive pole of the power supply, flows into the M- end of the motor through the MOS tube Q6B, and then flows out from the M+ end of the motor through the Q5A transistor and returns to the negative pole of the power supply.

7. According to claim 1, a smart lifting table control system based on Type-C interface power supply is characterized in that: In the current sampling circuit of the voltage and current detection module, the current signal is converted into a voltage signal through the resistor R24, the two ends of the resistor R30 are respectively connected to the output end and the inverting input end of the operational amplifier to form a negative feedback loop, and together with the resistors R26 and R28, a common-phase proportional operational amplifier circuit is formed, and the output signal of the operational amplifier is sent to the AD conversion circuit to convert the analog signal into a digital signal; In the voltage sampling circuit of the voltage and current detection module, resistors R32 and R33 form a voltage divider circuit, the voltage signal processed by the voltage divider is sent to the voltage follower, and the voltage signal processed by the voltage follower is sent to the AD conversion circuit, and the AD conversion circuit converts the analog voltage signal into a digital signal.

8. The intelligent lifting table control system based on Type-C interface power supply according to claim 1, characterized in that: The dual power supply control module includes a dual power supply control circuit and a voltage integration comparison circuit; the dual power supply control circuit is responsible for outputting the dual power supplies in series to the DC-DC module so that the DC-DC module can obtain greater input power; the voltage integration comparison circuit is connected in parallel at both ends of the input power supply to detect the amplitude of the power supply voltage change and compare it with the reference voltage. When the power supply leaves the constant voltage zone, the power supply is disconnected from the series circuit.

9. The intelligent lifting table control system based on Type-C interface power supply according to claim 1, characterized in that: The main-sub power switching module regards the external power supply as the main power supply and the battery inside the system as the secondary power supply. When the external power supply is connected to the system, the external power supply is used to power the various modules of the system; when the external power supply is withdrawn, in order to enable the system to work normally in a short time, the battery is used to power the system.

10. The intelligent lifting table control system based on Type-C interface power supply according to claim 6, characterized in that: The control system compares the rated output power of the external power supply with the current operating power of the motor. When it detects that the motor power exceeds 95% of the rated power of the external power supply, the control system uses PWM modulation technology to change the duty cycle of the input signal of the motor drive module and gradually decelerates the motor. On the contrary, when the power is sufficient and the current speed of the motor is lower than the preset speed value, the control system changes the duty cycle of the input signal of the motor drive module through PWM modulation technology and gradually accelerates the motor until the motor speed reaches the predetermined target speed and maintains a constant speed.

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