Guiding board lifting motor protection control system

Abstract

The utility model discloses a guide board lifting motor protection control system, which is provided with a main control unit, a current detection unit, a voltage conversion unit, a switch unit and a rectification unit, and when the main control unit receives a voltage signal output by the current detection unit and judges that the current corresponding to the voltage signal is smaller than a preset protection current, the current conversion unit is switched on and switched off. The main control unit outputs high level, the switch unit is closed, and the guide board lifting motor works normally; when the main control unit judges that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit outputs a low level, the switch unit is switched off, and the guide board lifting motor enters a protection state, so that the protection current can be flexibly set, the motor cannot be damaged due to overcurrent, and the working reliability of the guide board lifting motor protection control system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of current protection, and in particular relates to a guide plate lifting motor protection control system. Background Art

[0002] Guide signs play a very important role in modern society. They can point the direction to passers-by and contribute to the beautification of the city. Guide signs are generally marked with guide arrows and warning symbols. The height of guide signs is adjusted by the lifting motor. During the operation of the guide sign motor, a large current will appear in the circuit, damaging the components and making the motor unable to work normally. In addition, the maintenance of the guide sign lamp and circuit is more troublesome, resulting in the inability to repair the guide sign in time, which brings inconvenience to the use. Utility Model Content

[0003] In view of the above problems, the utility model provides a guide sign lifting motor protection control system, which can protect the current setting and motor protection so that the motor will not be damaged due to overcurrent, so as to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a guide sign lifting motor protection control system, comprising a main control unit, a current detection unit, a voltage conversion unit, a switch unit and a rectifier unit, wherein the current detection unit, the switch unit, the main control unit and the rectifier unit are all connected to the voltage conversion unit, the current detection unit and the switch unit are all connected to the main control unit, the current detection unit and the switch unit are all connected to the rectifier unit, and the current detection unit is connected to the switch unit;

[0006] The main control unit receives the current signal detected by the current detection unit, and controls the opening and closing of the switch unit according to the current signal to protect the guide sign lifting motor connected to the switch unit and the current detection unit.

[0007] As a preferred embodiment of the above technical solution, the voltage conversion unit includes a first voltage conversion circuit and a second voltage conversion circuit, the main control unit, the switch unit, the rectifier unit, and the second voltage conversion circuit are all connected to the first voltage conversion circuit, the second voltage conversion unit is connected to the current detection unit, the first voltage conversion circuit is used to power the main control unit, and the second voltage conversion circuit is used to power the current detection unit.

[0008] As a preferred embodiment of the above technical solution, the output voltage of the first voltage conversion circuit is greater than the output voltage of the second voltage conversion circuit, the first voltage conversion circuit includes a chip U2 with a model number of LMR16020PDDAR, and the second voltage conversion circuit includes a chip U3 with a model number of HT7533.

[0009] As a preferred embodiment of the above technical solution, the main control unit includes a chip U5 and an encoder connected to the chip U5, and the model of the encoder is SW-8421C.

[0010] As a preferred embodiment of the above technical solution, the encoder includes ten gears, and the protection currents of the first gear to the tenth gear increase sequentially.

[0011] As a preferred embodiment of the above technical solution, the switch unit includes a relay and a relay drive circuit connected to the relay, the model of the relay is SRA-05VDC-CL, and the relay drive circuit includes a diode, a transistor and a resistor.

[0012] As a preferred embodiment of the above technical solution, the current detection unit includes a chip U1 with a model number of CC6903SO-20A.

[0013] As a preferred embodiment of the above technical solution, the rectifier unit includes a chip U4 of model BM6S.

[0014] As a preferred embodiment of the above technical solution, when the main control unit receives the voltage signal output by the current detection unit and the main control unit determines that the current corresponding to the voltage signal is less than the preset protection current, the main control unit outputs a high level, the switch unit is closed, and the guide sign lifting motor works normally.

[0015] As a preferred embodiment of the above technical solution, when the main control unit determines that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit outputs a low level, the switch unit is disconnected, and the guide sign lifting motor enters a protection state.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By setting a main control unit, a current detection unit, a voltage conversion unit, a switch unit and a rectifier unit, when the main control unit receives the voltage signal output by the current detection unit and determines that the current corresponding to the voltage signal is less than the preset protection current, the main control unit outputs a high level, the switch unit is closed, and the guide sign lifting motor works normally; when the main control unit determines that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit outputs a low level, the switch unit is disconnected, and the guide sign lifting motor enters a protection state. The protection current can be flexibly set so that the motor will not be damaged due to overcurrent, thereby improving the working reliability of the guide sign lifting motor protection control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the structural block diagram of the guide sign lifting motor protection control system proposed by the utility model;

[0019] Figure 2 This is a circuit diagram of the main control unit proposed by the utility model;

[0020] Figure 3 A circuit diagram of the rectifier unit proposed in the utility model;

[0021] Figure 4 A circuit diagram of the current detection unit proposed in the utility model;

[0022] Figure 5 A circuit diagram of a first voltage conversion circuit proposed in the utility model;

[0023] Figure 6 A circuit diagram of a second voltage conversion circuit proposed in the utility model;

[0024] Figure 7 This is a circuit diagram of the switch unit proposed in the utility model.

[0025] The main component symbols are described as follows:

[0026] 100 - main control unit; 110 - current detection unit; 120 - voltage conversion unit; 121 - first voltage conversion circuit; 122 - second voltage conversion circuit; 130 - switch unit; 131 - relay; 132 - relay drive circuit; 140 - rectifier unit. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0029] See also Figure 1 The utility model provides a guide sign lifting motor protection control system, including a main control unit 100, a current detection unit 110, a voltage conversion unit 120, a switch unit 130 and a rectifier unit 140, wherein the current detection unit 110, the switch unit 130, the main control unit 100 and the rectifier unit 140 are all connected to the voltage conversion unit 120, the current detection unit 110 and the switch unit 130 are all connected to the main control unit 100, the current detection unit 110 and the switch unit 130 are all connected to the rectifier unit 140, and the current detection unit 110 is connected to the switch unit 130;

[0030] The main control unit 100 receives the current signal detected by the current detection unit 110 and controls the opening and closing of the switch unit 130 according to the current signal to protect the guide sign lifting motor connected to the switch unit 130 and the current detection unit 110 .

[0031] In this embodiment, the voltage conversion unit 120 includes a first voltage conversion circuit 121 and a second voltage conversion circuit 122. The main control unit 100, the switch unit 130, the rectifier unit 140, and the second voltage conversion circuit 122 are all connected to the first voltage conversion circuit 121. The second voltage conversion unit 122 is connected to the current detection unit 110. The first voltage conversion circuit 121 is used to supply power to the main control unit 100, and the second voltage conversion circuit 122 is used to supply power to the current detection unit 110. The output voltage of the first voltage conversion circuit 121 is greater than the output voltage of the second voltage conversion circuit 122. The first voltage conversion circuit 121 includes a chip U2 with a model number of LMR16020PDDAR, and the second voltage conversion circuit 122 includes a chip U3 with a model number of HT7533. The main control unit 100 includes a chip U5, an encoder connected to the chip U5, the model of the encoder is SW-8421C, the encoder includes ten gears, and the protection currents of the first gear to the tenth gear increase in sequence. The switch unit 130 includes a relay 131, a relay drive circuit 132 connected to the relay 131, the model of the relay 131 is SRA-05VDC-CL, and the relay drive circuit 132 includes a diode, a transistor and a resistor. The current detection unit 110 includes a chip U1 with a model CC6903SO-20A, and the rectifier unit 140 includes a chip U4 with a model BM6S.

[0032] It should be noted that the rectifier unit 140 includes IN1, IN2, capacitor C1 and capacitor C5. IN1 and IN2 are power supply terminals, connected to a DC12-24V power supply, powering the motor and also powering the main control unit 100. The capacitor C1 is 100uF, 50V. IN1 and IN2 are connected to the motor through a relay 131 and a current detection unit 110, respectively. Whether the motor rotates forward or reverse is determined by the polarity of the power supply. When IN1 is positive and IN2 is negative, the motor rotates forward; when IN1 is negative and IN2 is positive, the motor reverses. Because the polarity of IN1 and IN2 is not fixed and the circuit cannot be powered directly, the rectifier unit 140 is added. Regardless of the polarity of IN1 and IN2, after rectification, the third and fourth pins of U4 are fixed as positive and negative, respectively. The V+ end of the rectifier unit 140 is connected to the first voltage conversion circuit 121, the switch unit 130 and the current detection unit 110.

[0033] The first voltage conversion circuit 121 includes capacitor C7, resistor R4, resistor R5, chip U2, capacitor C8, diode D1, capacitor C12, inductor L4, resistor R7, resistor R8, capacitor C2 and capacitor C11. One end of capacitor C7 and resistor R4 are connected in parallel to pin 2 of chip U2, the other end of resistor R4 is connected to pin 3 of chip U4, resistor R5 is connected to pin 4 of chip U4, capacitor C8 is connected in parallel to pins 1 and 8 of chip U2, diode D1 and capacitor C12 are connected to pins 7 and 8 of chip U2, resistor R7 and capacitor C2 are connected to inductor L4, resistor R7 and resistor R8 are connected to pin 5 of chip U2, and capacitor C2 and capacitor C11 are connected in parallel to inductor L4. After inputting 12V or 24V, the first voltage conversion circuit 121 outputs a 5V voltage for powering the main control unit. The second voltage conversion circuit 122 includes a capacitor C10, a chip U3 and a capacitor C9. The capacitor C10 and the capacitor C9 are connected in parallel to the pins 1 and 2 of the chip U3. The second voltage conversion circuit 122 reduces the 5V input voltage to 3.3V for powering the current detection unit 110.

[0034] Among them, the switch unit 130 includes a relay 131 denoted as K3 and a relay drive circuit 132, the relay drive circuit 132 includes a diode D2, a resistor R3, a transistor Q1, a resistor RV1 and a capacitor C18, the diode D2 and the relay K3 are connected in parallel to the collector of the transistor Q1, the base of the transistor Q1 is connected to the resistor R3, the emitter of the transistor Q1 is grounded, the model of the transistor is S8050, and the resistor RV1 and the capacitor C18 are connected in parallel to the current detection unit 110. Under normal circumstances, the base of the transistor Q1 is at a high level, Q1 is turned on, the normally open switches of the pins 1 and 3 of the relay are energized, and the motor works; when the motor is blocked or other reasons cause the current flowing through the motor to increase to a value exceeding the set value, the main control unit 100, i.e., the single-chip microcomputer, outputs a low level to the base of Q1, Q1 is turned off, the normally open switch of the relay 131 is disconnected, and the motor is powered off and does not work.

[0035] Among them, the current detection unit 110 includes a chip U1 and a peripheral circuit. The chip U1 is a Hall sensor, and the peripheral circuit is a capacitor C4, a resistor R2 and a capacitor C6. The capacitor C4 is connected to pin 8 of the chip U1, and the capacitor C6 and the resistor R2 are connected to the chip U1. When current flows from IP+ to IP-, the magnetic field generated by the current induces a corresponding electrical signal in the Hall circuit. After signal processing, a voltage signal is output from pin 7, and then input into the microcontroller after passing through the resistor R2 and the capacitor C6. The main control unit includes a chip U5, a resistor R6, an LED3, a diode D3, a capacitor C17, a capacitor C13 and an encoder. Pin 6 of the chip U5 is connected to the resistor R2 and the capacitor C6 of the current detection unit 110. Pin 11 of the chip U5 is connected to the resistor R3 of the switch unit 130. The LED3 and the resistor R6 are connected to pin 5 of the chip U5. The diode D3 and the capacitor C17 are connected in parallel to pin 9 of the chip U5. The capacitor C17 and the capacitor C13 are connected in parallel. Pins 1, 4, 2, and 8 of the encoder K4 are connected to pins 20, 18, 19, and 17 of the chip U5, respectively.

[0036] Optionally, when the main control unit 100 receives the voltage signal output by the current detection unit 110, and the main control unit 100 determines that the current corresponding to the voltage signal is less than a preset protection current, the main control unit 100 outputs a high level, the switch unit 130 is closed, and the guide sign lifting motor works normally.

[0037] In this embodiment, when the main control unit 100 determines that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit 100 outputs a low level, the switch unit 130 is disconnected, and the guide sign lifting motor enters a protection state. The main control unit 100 has two main functions: protection current setting and motor protection. Protection current setting: The short-circuit point from pin 1 to pin 3 of the single-chip microcomputer and the encoder are jointly set. The maximum current is set from pin 1 to pin 3 of the single-chip microcomputer, and the encoder divides the maximum current into 10 gears; when pins 1 to pin 3 of the single-chip microcomputer are short-circuited to the ground respectively, the maximum current values ​​are 20A, 10A, and 5A respectively. The encoder has 10 gears, the first gear is 1 / 10 of the maximum current, the second gear is 2 / 10 of the maximum current... For example: when pin 1 is short-circuited to the ground, the maximum current is 20A, and the currents corresponding to the 10 gears of the encoder are 2A, 4A, 6A, 8A, 10A, 12A, 14A, 16A, 18A, and 20A. Motor protection: Pin 6 of the microcontroller is connected to the voltage signal output by the current detection unit. The microcontroller compares this signal with the set protection current. If the current corresponding to the voltage signal is less than the protection current, pin 11 outputs a high level, the relay switch is closed, and the motor works normally; if the current corresponding to the voltage signal is greater than the protection current, pin 11 outputs a low level, the relay switch is disconnected, thereby protecting the motor from damage due to overcurrent.

[0038] It should be understood that by setting the main control unit 100, the current detection unit 110, the voltage conversion unit 120, the switch unit 130 and the rectifier unit 140, when the main control unit 100 receives the voltage signal output by the current detection unit 110, and the main control unit 100 determines that the current corresponding to the voltage signal is less than the preset protection current, the main control unit 100 outputs a high level, the switch unit 130 is closed, and the guide sign lifting motor works normally; when the main control unit 100 determines that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit 100 outputs a low level, the switch unit 130 is disconnected, and the guide sign lifting motor enters a protection state. The protection current can be flexibly set so that the motor will not be damaged due to overcurrent, thereby improving the working reliability of the guide sign lifting motor protection control system.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A guide sign lifting motor protection control system, characterized in that: It includes a main control unit, a current detection unit, a voltage conversion unit, a switch unit and a rectifier unit, wherein the current detection unit, the switch unit, the main control unit and the rectifier unit are all connected to the voltage conversion unit, the current detection unit and the switch unit are all connected to the main control unit, the current detection unit and the switch unit are all connected to the rectifier unit, and the current detection unit is connected to the switch unit; The main control unit receives the current signal detected by the current detection unit, and controls the opening and closing of the switch unit according to the current signal to protect the guide sign lifting motor connected to the switch unit and the current detection unit.

2. The guide sign lifting motor protection control system according to claim 1 is characterized in that: The voltage conversion unit includes a first voltage conversion circuit and a second voltage conversion circuit. The main control unit, the switch unit, the rectifier unit, and the second voltage conversion circuit are all connected to the first voltage conversion circuit. The second voltage conversion circuit is connected to the current detection unit. The first voltage conversion circuit is used to supply power to the main control unit, and the second voltage conversion circuit is used to supply power to the current detection unit.

3. The guide sign lifting motor protection control system according to claim 2 is characterized in that: The output voltage of the first voltage conversion circuit is greater than the output voltage of the second voltage conversion circuit. The first voltage conversion circuit includes a chip U2 with a model number of LMR16020PDDAR, and the second voltage conversion circuit includes a chip U3 with a model number of HT7533.

4. The guide sign lifting motor protection control system according to claim 1 is characterized in that: The main control unit includes a chip U5 and an encoder connected to the chip U5, and the model of the encoder is SW-8421C.

5. The guide sign lifting motor protection control system according to claim 4 is characterized in that: The encoder includes ten gears, and the protection currents of the first gear to the tenth gear increase in sequence.

6. The guide sign lifting motor protection control system according to claim 1 is characterized in that: The switch unit includes a relay and a relay drive circuit connected to the relay. The model of the relay is SRA-05VDC-CL. The relay drive circuit includes a diode, a transistor and a resistor.

7. The guide sign lifting motor protection control system according to claim 1 is characterized in that: The current detection unit includes a chip U1 of model CC6903SO-20A.

8. The guide sign lifting motor protection control system according to claim 1 is characterized in that: The rectifier unit includes a chip U4 of model BM6S.

9. The guide sign lifting motor protection control system according to claim 1 is characterized in that: When the main control unit receives the voltage signal output by the current detection unit and determines that the current corresponding to the voltage signal is less than the preset protection current, the main control unit outputs a high level, the switch unit is closed, and the guide sign lifting motor works normally.

10. The guide sign lifting motor protection control system according to claim 9, characterized in that: When the main control unit determines that the current corresponding to the voltage signal is greater than or equal to the preset protection current, the main control unit outputs a low level, the switch unit is disconnected, and the guide sign lifting motor enters a protection state.

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