Linear drive control system

Abstract

The present invention discloses a linear drive control system, the drive control system includes a controller, a motor drive module, a motor and a position control module, a power module is connected to the controller, the controller is connected to the control end of the motor drive module, the position control module is connected in series between the controller and the motor drive module to form a control loop, the power module is directly or indirectly connected to the drive end of the motor drive module, the power is input to the motor drive module, the motor drive module is connected to the motor to form a drive loop. In the present invention, the control loop controls the operation of the drive loop, the drive loop is directly connected in series with the motor and the power supply through the motor drive module to form a loop, the loop length and connection points are reduced, thereby reducing unnecessary line loss and connection point loss, and the effect of using a +12V power supply to directly drive the linear drive can be achieved.

Description

Technical Field

[0001] The invention discloses a control system, in particular to a linear actuator drive control system, belonging to the field of smart home accessories control. Background Art

[0002] Linear actuators, also known as linear actuators or linear push rods, are widely used in various smart furniture, such as smart sofas, smart beds, massage chairs, etc. The linear motion of the linear actuator is used to adjust various posture parameters of smart furniture, such as height, tilt angle, front and back position, etc.

[0003] Traditional linear drives are usually equipped with an external drive power supply. The rated voltage of the external power supply is generally +24V. Due to the error of electronic components such as transformers, the external power supply of linear drives may sometimes reach +29V. Figure 1 and attached Figure 2 The driving control loop of the traditional linear drive is power supply → controller → motor → position control module, and all loads and control switch modules are connected in series into a closed loop.

[0004] If the linear drive is installed in a vehicle, the rated voltage of the vehicle low-voltage power supply is usually +12V (the operating voltage may reach +12.8V to +13.6V). If the traditional linear drive drive control loop is used, the control loop is long, the line loss and node resistance are large, which may cause the linear drive to not work properly. If the +12V power supply is converted into a +24V power supply through a transformer, an external transformer will be added, thereby increasing the cost of use. Summary of the invention

[0005] In view of the above-mentioned shortcoming that the driving control circuit of the traditional linear drive in the prior art cannot be driven by a +12V power supply, the present invention provides a linear drive driving control system, which includes a driving circuit and a control circuit. The control circuit controls the operation of the driving circuit. The driving circuit is directly connected in series with the motor and the power supply through the motor driving module to form a circuit, thereby reducing the circuit length and connection points, thereby reducing unnecessary line losses.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a linear drive drive control system, the drive control system includes a controller, a motor drive module, a motor and a position control module, the power supply module is connected to the controller, the controller is connected to the control end of the motor drive module, the position control module is connected in series between the controller and the motor drive module to form a control loop, the power supply module is directly or indirectly connected to the drive end of the motor drive module, the power supply is input to the motor drive module, and the motor drive module is connected to the motor to form a drive loop.

[0007] The technical solution adopted by the present invention to solve the technical problem further includes:

[0008] The motor drive module includes a diode D2, a diode D3, a relay K1 and a relay K2, the anodes / cathodes of the diode D2 and the diode D3 are connected to each other, the cathode / anode of the diode D2 is connected to the position control module, the cathode / anode of the diode D3 is connected to the connection joint, the control coil of the relay K1 is connected in parallel with the diode D3, the control coil of the relay K2 is connected in parallel with the diode D2, the normally open contacts of the relay K1 and the relay K2 are respectively connected to the positive power supply in the power module, the normally closed contacts of the relay K1 and the relay K2 are respectively grounded, and the common contacts of the relay K1 and the relay K2 are respectively connected to the two ends of the motor M.

[0009] A capacitor C1 is connected in parallel with the diode D2, and a capacitor C2 is connected in parallel with the diode D3.

[0010] The position control module includes two travel switches, namely switch KEY-A and switch KEY-B. A diode DA is connected in parallel with switch KEY-A, and a diode DB is connected in parallel with switch KEY-B. The anodes / cathodes of diode DA and diode DB are connected to each other, the cathode / anode of diode DA is connected to the controller, and the cathode / anode of diode DB is connected to the motor drive module.

[0011] The power module adopts a +12V external power supply or a +12V battery or a vehicle-mounted +12V power supply.

[0012] The controller adopts a separately arranged hand controller.

[0013] The controller includes a power input terminal and two control switches, the two control switches are switch S1 and switch S2, and one end of switch S1 and switch S2 are connected to a +12V power supply and the other end is connected to GND.

[0014] A TVS tube is connected in parallel with the motor.

[0015] A diode D3 is connected in series to the positive power input terminal of the power module.

[0016] A capacitor C3 is connected between the positive power input terminal of the power module and the ground.

[0017] The beneficial effects of the present invention are as follows: the control circuit in the present invention controls the operation of the drive circuit, and the drive circuit is directly connected in series with the motor and the power supply through the motor drive module to form a loop, thereby reducing the loop length and connection points, thereby reducing unnecessary line loss and connection point loss, and achieving the effect of using a +12V power supply to directly drive the linear driver.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a block diagram of a conventional linear actuator control system.

[0020] Figure 2 This is the schematic diagram of a conventional linear actuator control system.

[0021] Figure 3 This is a schematic diagram of the hand controller circuit in the present invention.

[0022] Figure 4 It is a partial block diagram of the linear drive of the present invention.

[0023] Figure 5 This is a partial schematic diagram of the linear drive of the present invention. DETAILED DESCRIPTION

[0024] This embodiment is a preferred implementation mode of the present invention. Other embodiments whose principles and basic structures are the same or similar to those of this embodiment are within the protection scope of the present invention.

[0025] Please refer to the attached Figure 3 , Attachment Figure 4 and attached Figure 5 The present invention mainly includes a controller, a motor drive module, a motor and a position control module. The power module is connected to the controller, and power is input to the controller through the power module. The controller is connected to the control end of the motor drive module. The position control module is connected in series between the controller and the motor drive module. The motor drive module is controlled to work through the controller and the position control module, thereby forming a control loop. The power module is directly or indirectly connected to the drive end of the motor drive module, and power is input to the motor drive module. The motor drive module is connected to the motor to drive the motor to work, thereby forming a drive loop.

[0026] In this embodiment, the power module is implemented by a +12V external power supply or a +12V battery or a vehicle-mounted +12V power supply. In this embodiment, the power module uses a DC connector for input, wherein +12V marked in the figure is the positive terminal of the DC power supply, and GND or ground marked in the figure is the negative terminal of the DC power supply.

[0027] In this embodiment, the controller adopts a separately set hand controller, which can be connected to the linear drive through a connecting connector. In specific implementation, the controller can also be directly set on the linear drive. In this embodiment, taking the hand controller as an example, the controller includes a power input terminal, two control switches and a connecting connector. If the controller is directly set on the linear drive, the connecting connector is omitted and a cable is used for direct connection. The two control switches are switch S1 and switch S2. Switch S1 and switch S2 are both connected to the +12V power supply at one end and connected to GND at the other end. The common end is connected to the control loop. The common end of switch S1 is connected to the connection connector P3 interface, and the common end of switch S2 is connected to the connection connector P2 interface. When working, one of switch S1 and switch S2 is connected to the +12V power supply, and the other is connected to the ground wire, so that the positive power supply is connected to the control loop through switch S1 or switch S2, thereby controlling the forward or reverse rotation of the motor. In this embodiment, the P1 port and the P6 port of the connection connector are respectively connected to the +12V power supply (used for the DC connector to input +12V power to the hand controller) and GND, and are used to input the DC connector power to the hand controller.

[0028] The motor drive module adopts a circuit module that can be bidirectionally conducted by power-on control. In this embodiment, the structure of the present invention is explained by taking a relay in combination with a diode as an example. When it is implemented specifically, other circuit forms of structures can also be used. In this embodiment, the motor drive module includes a diode D2, a diode D3, a relay K1 and a relay K2. The diode D2 and the diode D3 are connected in reverse series, that is, the anodes of the diode D2 and the diode D3 are connected to each other (when it is implemented specifically, the cathodes of the diode D2 and the diode D3 are connected to each other for the same effect), the cathode of the diode D2 is connected to the position control module, and the cathode of the diode D3 is connected to the connection joint. Specifically, the cathode of the diode D3 is connected to the P2 interface of the connection joint, the control coil of the relay K1 is connected in parallel with the diode D3, and the control coil of the relay K2 is connected to the The diode D2 is connected in parallel, the normally open contacts of the relay K1 and the relay K2 are respectively connected to the +12V power supply (i.e., the positive power supply end of the DC connector in this embodiment), the normally closed contacts of the relay K1 and the relay K2 are respectively grounded (i.e., the ground of the DC connector in this embodiment), and the common contacts of the relay K1 and the relay K2 are respectively connected to the two ends of the motor M. In specific implementation, the normally open contacts of the relay K1 and the relay K2 can also be grounded, and the normally closed contacts of the relay K1 and the relay K2 can be respectively connected to the +12V power supply (i.e., the positive power supply end of the DC connector in this embodiment), and the effect is the same. When the positive power supply is input to the P3 port of the connection connector and the P2 port of the connection connector is grounded (i.e., the negative power supply is input), the control loop current is input from the P3 port of the connection connector, passes through the position control module, and then passes through the control coil of relay K1, and then passes through diode D2 (at this time, the control coil of relay K2 is short-circuited by diode D2), and then output through the P2 port of the connection connector. At this time, the normally open contact of relay K1 is closed, the normally closed contact is disconnected, the normally open contact of relay K2 is disconnected, and the normally closed contact is closed. The drive loop current directly passes through the normally open contact of relay K1, then flows through the motor M, and then passes through the normally closed contact of relay K2 and then connects to the negative pole of the power supply (i.e., grounded). Assume that the motor rotates forward at this time; when the positive power supply is input to the P2 port of the connecting connector and the P3 port of the connecting connector is grounded (that is, the negative power supply is input), the control loop current is input from the P2 port of the connecting connector, and then passes through the diode D3 (at this time, the control coil of the relay K1 is short-circuited by the diode D3), and then passes through the position control module and is output through the P3 port of the connecting connector. At this time, the normally open contact of the relay K2 is closed and the normally closed contact is disconnected, the normally open contact of the relay K1 is disconnected, and the normally closed contact is closed. The drive loop current passes through the normally open contact of the relay K2, and then flows through the motor M, and then passes through the normally closed contact of the relay K1 and is connected to the negative pole of the power supply (that is, grounded). At this time, the motor reverses.

[0029] In this embodiment, the capacitor C1 is connected in parallel with the diode D2, and the capacitor C2 is connected in parallel with the diode D3, so that the operating voltage of the relay K1 and the relay K2 can be more stable and the working effect can be better.

[0030] In the above embodiment, relay K1 and relay K2 are used as motor drive modules for explanation. In specific implementation, other components can also be used. The input signals of the P2 port of the connection joint and the P3 port of the connection joint are used as control signals to control the on and off of the motor drive module, thereby realizing the reversal of the current flowing through the motor, and then controlling the forward or reverse rotation of the motor. For example, four transistors, MOS tubes, IGBTs, etc. are used, two of which are connected to the motor forward rotation circuit (i.e., one is connected between the motor and the positive power supply, and the other is connected between the motor and the negative power supply), and two are connected to the motor reverse rotation circuit. The control ends of the two transistors, MOS tubes, and IGBTs connected to the motor forward rotation circuit are connected to the P3 port of the connection joint. When the P3 port of the connection joint inputs the positive power supply, the motor is controlled to rotate forward; the control ends of the two transistors, MOS tubes, and IGBTs connected to the motor reverse rotation circuit are connected to the P2 port of the connection joint. When the P2 port of the connection joint inputs the positive power supply, the motor is controlled to reverse. The use of transistors, MOS tubes, IGBTs, etc. is only one of the embodiments. In specific implementation, components such as switch chips can also be used to replace them.

[0031] In this embodiment, the position control module includes two travel switches, namely switch KEY-A and switch KEY-B, a diode DA is connected in parallel with switch KEY-A, a diode DB is connected in parallel with switch KEY-B, and diode DA and diode DB are connected in reverse series, that is, the anodes of diode DA and diode DB are connected to each other, the cathode of diode DA is connected to the connection connector P3 interface, and the cathode of diode DB is connected to the motor drive module. The control loop can be bidirectionally non-conductive by the reverse series connection of diode DA and diode DB, and when switch KEY-A and switch KEY-B short-circuit diode DA and diode DB, the control loop can be turned on at the position control module. When the positive power supply is input to the P3 port of the connector, the positive power supply is input to the motor drive module through the switch KEY-A and then the switch KEY-B, and finally output through the P2 interface of the connector. At this time, the motor rotates forward and the slider moves to the left. When the slider touches the switch KEY-A, it is disconnected. Since the diode DA is connected to the control loop in the reverse direction, when the switch KEY-A is disconnected, the entire control loop is not conductive, and the motor stops rotating, indicating that the slider has slid to the end. At this time, the switch KEY-B and the diode DB are both conductive, which does not affect the connection of this end to the control loop; when the positive power supply is input to the P2 port of the connector, the current flow direction and the working process are just opposite, which will not be repeated here. In the above embodiment, the travel switch is used as the position control module. In the specific implementation, a Hall switch, a mercury switch, etc. can also be used to achieve the same function and usage. Of course, if the motor uses a stepper motor or a servo motor, the position control module can also be cancelled, and the travel can be controlled by software alone.

[0032] In this embodiment, TVS tube T1 and TVS tube T2 are connected in parallel with the motor M to prevent peak pulses, surge currents, etc. from affecting the operation of the motor M. During specific implementation, a TVS tube or other protective elements with similar functions can be connected according to actual needs.

[0033] In this embodiment, a diode D3 is connected in series to the positive power input terminal of the drive circuit. When the motor starts, the voltage will drop, which may drop to a lower setting of 5V. In order to prevent the impact on the charging circuit in the controller caused by the instant of motor startup, the diode D3 is added here to isolate the power supply. At the same time, an energy storage element, namely capacitor C3, is added to make the power supply smoother and better protect the charging circuit in the controller.

[0034] When the present invention is used, the switch S1 of the hand controller is pressed, and the positive power in the control loop passes through the switch S1, is inputted from the interface of the connection joint P3, and sequentially passes through the travel switch KEY-A, the diode DB (or the travel switch KEY-A), the control coil of the relay K1 and the diode D2, and finally is inputted back to the hand controller through the interface of the connection joint P2, thus forming a complete control loop. At this time, in the drive loop, the normally open contact of the relay K1 is turned on, and the positive power flows forward into the motor M (such as Figure 4 The middle direction is from bottom to top, or Figure 4 When placed normally, it flows in from left to right), and then passes through the normally closed contact of relay K2 to the negative power supply terminal. At this time, the motor rotates forward. When the slider slides to the travel switch KEY-A, the travel switch KEY-A is disconnected, and the travel ends. When the hand control switch S2 is pressed, the whole process is reversed and will not be repeated.

[0035] In the present invention, the control circuit controls the operation of the drive circuit. The drive circuit is directly connected in series with the motor and the power supply through the motor drive module to form a loop, thereby reducing the loop length and connection points, thereby reducing unnecessary line loss and connection point loss, and achieving the effect of directly driving the linear driver with a +12V power supply.

Claims

1. A linear actuator drive control system, characterized in that: The drive control system includes a controller, a motor drive module, a motor and a position control module, the power module is connected to the controller, the controller is connected to the control end of the motor drive module, the position control module is connected in series between the controller and the motor drive module to form a control loop, the power module is directly or indirectly connected to the drive end of the motor drive module, the power is input to the motor drive module, and the motor drive module is connected to the motor to form a drive loop; The motor drive module includes a diode D2, a diode D3, a relay K1 and a relay K2. When the anode of the diode D2 and the anode of the diode D3 are connected to each other, the cathode of the diode D2 is connected to the position control module, and the cathode of the diode D3 is connected to the connection connector of the controller. When the cathode of the diode D2 and the cathode of the diode D3 are connected to each other, the anode of the diode D2 is connected to the position control module, and the anode of the diode D3 is connected to the connection connector of the controller; The control coil of relay K1 is connected in parallel with diode D3, the control coil of relay K2 is connected in parallel with diode D2, the normally open contacts of relay K1 and relay K2 are respectively connected to the positive power supply in the power module, the normally closed contacts of relay K1 and relay K2 are respectively grounded, and the common contacts of relay K1 and relay K2 are respectively connected to the two ends of motor M; A capacitor C1 is connected in parallel with the diode D2, and a capacitor C2 is connected in parallel with the diode D3; The position control module includes two travel switches, namely switch KEY-A and switch KEY-B, a diode DA is connected in parallel with switch KEY-A, and a diode DB is connected in parallel with switch KEY-B; When the anodes of diode DA and diode DB are connected to each other, the cathode of diode DA is connected to the controller, and the cathode of diode DB is connected to the motor drive module; When the cathodes of the diode DA and the diode DB are connected to each other, the anode of the diode DA is connected to the controller, and the anode of the diode DB is connected to the motor drive module.

2. The linear actuator drive control system according to claim 1, characterized in that: The power module adopts a +12V external power supply or a +12V battery or a vehicle-mounted +12V power supply.

3. The linear actuator drive control system according to claim 1, characterized in that: The controller adopts a separately arranged hand controller.

4. The linear actuator drive control system according to claim 1, characterized in that: The controller includes a power input terminal and two control switches, the two control switches are switch S1 and switch S2, and both switch S1 and switch S2 have one end connected to a +12V power supply and the other end connected to GND.

5. The linear actuator drive control system according to claim 1, characterized in that: A TVS tube is connected in parallel with the motor.

6. The linear actuator drive control system according to claim 1, characterized in that: A diode D3 is connected in series to the positive power input terminal of the power module.

7. The linear actuator drive control system according to claim 1, characterized in that: A capacitor C3 is connected between the positive power input terminal of the power module and the ground.

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