A power supply control circuit based on fixed column of dense shelves

Abstract

The application discloses a power supply control circuit based on a fixed column of dense shelves, which comprises a first relay KM1 and a power supply control circuit, and the normally open contact of the first relay KM1 is connected in series on a power loop of an electronic display screen; the power supply control circuit comprises a driving power supply VCC, a first protection module and a circuit control module; the first protection module comprises a current-limiting resistor R1 and a first filter capacitor C1, one end of the current-limiting resistor R1 is connected to the positive pole of the driving power supply VCC, the other end of the current-limiting resistor R1 is connected to one end of the coil of the first relay KM1, and the first filter capacitor C1 is connected in parallel with the current-limiting resistor R1; the circuit control module is connected to the other end of the coil of the first relay KM1 and is used for controlling the other end of the coil of the first relay KM1 to be grounded. The application has the effect of improving the stability and safety of relay operation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of circuit control, in particular to a power supply control circuit based on fixed columns of a dense shelf. BACKGROUND

[0002] At present, with the development of Internet technology, intelligent electric file dense shelves are increasingly popular in the storage of files in government, enterprise and institution, hospital, school, bank and army units. The intelligent dense shelf has excellent performance, can greatly reduce the difficulty of file management, and maximally liberate manpower.

[0003] The intelligent electric file dense shelf is a commonly used file storage device, which can be called an intelligent dense shelf. The intelligent dense shelf generally comprises fixed columns and movable columns, and electronic display screens are installed on the fixed columns and the movable columns. The fixed columns are generally provided with a power supply control circuit. The power supply control circuit comprises a power supply control part, an MCU and a communication part. One part of the power supply control part provides power for the movement of the movable columns, thereby facilitating the movement of the movable columns. The other part of the power supply control part provides power for the electronic display screens.

[0004] A relay is usually used as a switch in the power supply control part. In the working process of the relay, the coil in the relay is continuously powered, thereby easily causing heating, and further affecting the stability and safety of the operation of the relay. SUMMARY

[0005] The application provides a power supply control circuit based on fixed columns of a dense shelf, which has the effect of facilitating the improvement of the stability and safety of the operation of the relay.

[0006] The application provides a power supply control circuit based on fixed columns of a dense shelf, which adopts the following technical scheme:

[0007] A power supply control circuit based on fixed columns of a dense shelf comprises a first relay KM1 and a power supply control circuit. The normally open contact of the first relay KM1 is connected in series on the power supply loop of the electronic display screen. The power supply control circuit comprises a driving power supply VCC, a first protection module and a circuit control module. The first protection module comprises a current limiting resistor R1 and a first filter capacitor C1. One end of the current limiting resistor R1 is connected to the positive electrode of the driving power supply VCC, the other end of the current limiting resistor R1 is connected to one end of the coil of the first relay KM1, and the first filter capacitor C1 is connected in parallel with the current limiting resistor R1. The circuit control module is connected to the other end of the coil of the first relay KM1, and is used for controlling the other end of the coil of the first relay KM1 to be grounded.

[0008] When the electronic display screen needs to be powered, the circuit control module makes the other end of the coil of the first relay KM1 grounded, so that the driving power supply VCC supplies power to the coil of the first relay KM1, and then the normally open contact of the first relay KM1 is closed, thereby facilitating the external power supply to supply power to the electronic display, and the electronic display screen works.

[0009] Since the current-limiting resistor R1 is connected in series between the driving power supply VCC and the coil of the first relay KM1, the resistance value of the circuit connected between the driving power supply VCC and the coil of the first relay KM1 is increased, and the current value flowing into the coil of the first relay KM1 is reduced, thereby reducing the degree of heating of the coil of the first relay KM1 caused by the direct power supply of the coil of the first relay KM1 by the driving power supply VCC. The first filter capacitor C1 and the current-limiting resistor R1 are connected in parallel to improve the stability of the output current of the driving power supply VCC.

[0010] In summary, the above technical solution has the effect of improving the stability and safety of the operation of the first relay KM1.

[0011] Preferably, the circuit control module comprises a control unit, an isolation unit and a driving unit.

[0012] The control unit is configured to output a control signal.

[0013] The isolation unit is connected to the control unit and the driving unit respectively, and is configured to isolate the control unit and the driving unit and output an isolation control signal when receiving the control signal.

[0014] The driving unit is configured to output a driving signal when receiving the isolation control signal, and drive the coil of the first relay KM1 to be powered on / off.

[0015] By using the above technical solution, the control signal output by the control unit is transmitted to the isolation unit, the isolation unit receives the control signal to generate the isolation control signal, and the driving unit receives the isolation control signal to generate the driving signal, and the driving signal controls the coil of the first relay KM1 to be powered on.

[0016] Preferably, the control unit comprises an MCU, and the control unit is connected to a voltage conversion unit for supplying power to the MCU.

[0017] The voltage conversion unit comprises:

[0018] The AC / DC converter is configured to access an external AC power supply and output a first DC power supply.

[0019] The DC / DC converter is connected to the AC / DC converter and the MCU respectively, and is configured to access the first DC power supply and output a second DC power supply for the operation of the MCU.

[0020] By adopting the technical scheme, the AC / DC converter converts an external AC power supply into a first DC power supply, the DC / DC converter is connected to the first DC power supply and converts the first DC power supply into a second DC power supply, and the second DC power supply is adapted to the MCU, thereby facilitating the control of the MCU.

[0021] Preferably, the driving unit comprises an NPN type transistor Q1, the collector of the transistor Q1 is connected to the positive pole of a driving power supply VCC through a fifth current-limiting resistor R7, the emitter of the transistor Q1 is grounded, the base of the transistor Q1 is connected to the output end of the isolation unit and is used for receiving the isolation control signal, and one end of the coil of the first relay KM1 connected to the driving unit is connected to the collector of the transistor Q1.

[0022] By adopting the technical scheme, when the isolation unit outputs a high-level signal to the base of the transistor Q1, the collector and the emitter of the transistor Q1 are turned on, so that the driving power supply VCC supplies power to the coil of the first relay KM1, and then the normally open contact of the first relay KM1 is closed, at this time, the electronic display screen works; when the isolation unit outputs a low-level signal to the base of the transistor Q1, the collector and the emitter of the transistor Q1 are turned off, and the driving power supply VCC cannot supply power to the coil of the first relay KM1, and the first relay KM1 stops working, at this time, the electronic display screen is powered off and stops working.

[0023] Preferably, the isolation unit comprises an optoelectronic coupler U1, the input positive pole of the optoelectronic coupler U1 is connected to the positive pole of the driving power supply VCC through a first pull-up resistor R2, and the input negative pole of the optoelectronic coupler U1 is connected to the positive pole of the driving power supply VCC through a second pull-up resistor R3.

[0024] The input negative pole of the optoelectronic coupler U1 is also connected to the output interface of the MCU and is used for receiving a control signal.

[0025] The output positive pole of the optoelectronic coupler U1 is connected to the positive pole of the driving power supply VCC through a second current-limiting resistor R4.

[0026] The output negative pole of the optoelectronic coupler U1 is connected to the base of the transistor Q1 through a third current-limiting resistor R5 and is used for outputting an isolation control signal.

[0027] The output negative pole of the optoelectronic coupler U1 is also grounded through a fourth current-limiting resistor R6, and the fourth current-limiting resistor R6 is connected in parallel with a second filter capacitor C2.

[0028] By adopting the technical scheme, when the driving unit is not working, the input positive pole of the photoelectric coupler U1 is connected to the positive pole of the driving power supply VCC through the first pull-up resistor R2, and the input negative pole of the photoelectric coupler U1 is connected to the positive pole of the driving power supply VCC through the second pull-up resistor R3, at this time, the input positive pole of the photoelectric coupler U1 and the input negative pole of the photoelectric coupler U1 are equipotential, at this time, the photoelectric coupler U1 does not work;

[0029] When the driving unit works, the output end of the MCU outputs a low-level signal, at this time, the potential of the input positive pole of the photoelectric coupler U1 is higher than that of the input negative pole of the photoelectric coupler U1, at this time, the photoelectric coupler U1 works, so that the output positive pole and the output negative pole of the photoelectric coupler U1 are turned on, at this time, the output negative pole of the photoelectric coupler U1 transmits a high-level signal to the base of the triode Q1, so that the collector and the emitter of the triode Q1 are turned on, and then the driving power supply VCC supplies power to the coil of the first relay KM1.

[0030] Preferably, a second protection module is arranged between the circuit control module and the first protection module, the second protection module comprising a diode D1, an anode of the diode D1 being connected to the collector of the triode Q1, and a cathode of the diode D1 being connected to a common connection point of the current-limiting resistor R1 and the coil of the first relay KM1.

[0031] By adopting the technical scheme, the diode D1 is arranged between the circuit control module and the first protection module, so as to facilitate protection of the circuit control module and the first protection module.

[0032] Preferably, a light-emitting diode D2 is connected between the fifth current-limiting resistor R7 and the driving power supply VCC, an anode of the light-emitting diode D2 being connected to the positive pole of the driving power supply VCC, and a cathode of the light-emitting diode D2 being connected to the fifth current-limiting resistor R7.

[0033] By adopting the technical scheme, when the collector and the emitter of the triode Q1 are turned on, the driving power supply VCC provides current for the light-emitting diode D2, so as to make the light-emitting diode D2 work, and then facilitate prompting of an operator.

[0034] Preferably, the electronic display screen is further connected with a voltage stabilizing circuit, an input end of the voltage stabilizing circuit being connected with the power supply circuit, an output end of the voltage stabilizing circuit being connected with a power interface of the electronic display screen, the input end of the voltage stabilizing circuit being connected with a second relay KM2 in series, the second relay KM2 being connected with a controller, the controller being connected with a movable column control panel, when the movable column moves, the movable column control panel outputs a moving signal, the controller controls the second relay KM2 to work in response to the moving signal, so as to make the voltage stabilizing circuit supply power to the electronic display screen.

[0035] By adopting the technical scheme, when the active column moves, the voltage of the circuit for powering the electronic display screen is reduced, and at this time, the electronic display screen can not work normally.

[0036] However, when the active column moves, the first relay KM1 stops working, the active column control panel outputs a moving signal, the controller receives the moving signal to drive the second relay KM2 to work, and the voltage reducing circuit converts the reduced voltage to the voltage for the electronic display screen to work normally, so that the electronic display screen works normally.

[0037] Preferably, the voltage reducing circuit comprises a voltage boosting circuit and a clamping circuit, the clamping circuit comprises a voltage stabilizing diode D3, an anode of the voltage stabilizing diode D3 is connected to a power connection positive pole of the electronic display screen, and a cathode of the voltage stabilizing diode D3 is grounded.

[0038] An input end of the voltage boosting circuit is connected to the power supply circuit through the second relay KM2, and an output end of the voltage boosting circuit is connected to a power supply interface of the electronic display screen.

[0039] By adopting the technical scheme, when the voltage of the circuit for powering the electronic display screen is reduced, the voltage boosting circuit increases the reduced voltage to the voltage for the electronic display screen to work normally, and the voltage stabilizing diode D3 stabilizes the boosted voltage to a stable voltage value, thereby facilitating power supply for the electronic display screen.

[0040] Preferably, the second relay KM2 is further provided with an auxiliary capacitor C3 away from the voltage reducing circuit, one end of the auxiliary capacitor C3 is connected to the power supply circuit, and the other end of the auxiliary capacitor C3 is grounded.

[0041] By adopting the technical scheme, before the first relay KM1 stops working, the power supply circuit charges the auxiliary capacitor C3 all the time, when the first relay KM1 stops working, the auxiliary capacitor C3 facilitates power supply for the electronic display screen at the moment when the second relay KM2 works, thereby reducing the probability of "screen flashing" of the electronic display screen in the process of switching of the first relay KM1 and the second relay KM2.

[0042] In summary, the present application has the following beneficial effects:

[0043] 1、when the need to power supply for electronic display, the circuit control module makes the other end of the coil of the first relay KM1 ground, so that the drive power supply VCC for the coil of the first relay KM1, in turn, the first relay KM1 open contact closed, so as to facilitate the external power supply for electronic display, make electronic display screen work; because the drive power supply VCC and the coil of the first relay KM1 between the series current limiting resistor R1, so that the drive power supply VCC and the coil of the first relay KM1 circuit resistance value becomes large, so that the current flowing into the coil of the first relay KM1 value is small, in turn, reduce the degree of the coil of the first relay KM1 due to the drive power supply VCC directly for the coil of the first relay KM1, and the coil of the first relay KM1 heating, the first filter capacitor C1 and current limiting resistor R1 in parallel to facilitate the stability of the output current of the first DC power supply V1; the above, the above technical scheme has the effect of facilitating the stability and safety of the first relay KM1 operation;

[0044] 2、when the voltage value of the circuit for electronic display power supply is reduced, the voltage increasing circuit increases the reduced voltage value to the voltage of the electronic display screen normal work, the voltage stabilizing diode D3 stabilizes the voltage after voltage increasing to a stable voltage value, so as to facilitate the power supply for electronic display. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 for the overall circuit diagram of the embodiment of the application.

[0046] Figure 2 for the circuit diagram of the power supply control circuit of the embodiment of the application.

[0047] Figure 3 for the circuit diagram of the voltage stabilizing circuit of the embodiment of the application.

[0048] BRIEF DESCRIPTION OF DRAWINGS: 1, electronic display screen; 2, power supply control circuit; 21, first protection module; 22, circuit control module; 221, voltage conversion unit; 222, control unit; 223, isolation unit; 224, drive unit; 23, second protection module; 3, voltage stabilizing circuit; 31, voltage increasing circuit; 32, clamping circuit; 4, controller. DETAILED DESCRIPTION

[0049] The application discloses a power supply control circuit based on dense shelf fixed column, referring to Figure 1 and Figure 2 , the power supply control circuit based on dense shelf fixed column includes the first relay KM1, the power supply control circuit 2 and the voltage stabilizing circuit 3.

[0050] referring to Figure 1 and Figure 2One end of the normally open contact KM1-1 of the first relay KM1 is connected to the positive terminal of the electronic display screen 1, and the other end of the normally open contact KM1-1 of the first relay KM1 is connected with an AC / DC converter, the AC / DC converter is connected with an external AC power supply, so as to convert the external AC power supply into a DC power supply for the normal operation of the electronic display screen 1. The coil of the first relay KM1 is connected with a power supply control circuit 2, the power supply control circuit 2 is used for supplying power to the coil of the first relay KM1, so as to facilitate the operation of the first relay KM1. The coil of the first relay KM1 comprises an A port and a B port.

[0051] With reference to Figure 1 The electronic display screen 1 and the AC / DC converter are further provided with a voltage stabilizing circuit 3 and a second relay KM2, one end of the normally open contact KM2-1 of the second relay KM2 is connected to the common connection point of the AC / DC converter and the normally open contact KM1-1 of the first relay KM1, and the other end of the normally open contact KM2-1 of the second relay KM2 is connected to the input end of the voltage stabilizing circuit 3. The coil of the second relay KM2 is connected with a controller 4, the controller 4 is used for controlling the power-on / off of the coil of the second relay KM2.

[0052] With reference to Figure 1 The output end of the voltage stabilizing circuit 3 is connected to the positive terminal of the electronic display screen 1. The controller 4 is connected with a movable column control board, when the movable column moves, the movable column control board outputs a moving signal, at this time, the operator can turn off the first relay KM1, the controller 4 receives the moving signal and controls the second relay KM2 to work, so as to make the voltage stabilizing circuit 3 supply power to the electronic display screen 1.

[0053] With reference to Figure 2 The control circuit 2 comprises a driving power supply VCC, a first protection module 21, a circuit control module 22 and a second protection module 23. The first protection module 21 comprises a current limiting resistor R1 and a first filter capacitor C1, one end of the current limiting resistor R1 is connected to the positive terminal of the driving power supply VCC, the other end of the current limiting resistor R1 is connected to the B port of the coil of the first relay KM1, and the first filter capacitor C1 is connected in parallel with the current limiting resistor R1.

[0054] With reference to Figure 2 The input end of the circuit control module 22 is connected to the external AC power supply, the output end of the circuit control module 22 is connected to the A port of the coil of the first relay KM1, and the circuit control module 22 is used for controlling the on-off of the current in the coil of the first relay KM1. The second protection module 23 is arranged between the first protection module 21 and the circuit control module 22, so as to facilitate the protection of the first protection module 21 and the circuit control module 22.

[0055] With reference to Figure 2The circuit control module 22 comprises a voltage conversion unit 221, a control unit 222, an isolation unit 223 and a driving unit 224. The voltage conversion unit 221 comprises an AC / DC converter and a DC / DC converter, the control unit 222 comprises an MCU, the input end of the AC / DC converter is connected with an external AC power supply, the output end of the AC / DC converter is connected with the input end of the DC / DC converter, the output end of the DC / DC converter is connected with the input end of the MCU, the output end of the MCU is connected with the input end of the isolation unit 223, and the output end of the isolation unit 223 is connected with the input end of the driving unit 224.

[0056] The AC / DC converter is used to convert the external AC power supply into a first DC power supply, the DC / DC converter is used to convert the first DC power supply into a second DC power supply suitable for the MCU, so as to facilitate the work of the MCU, the MCU generates a control signal and transmits the control signal to the isolation unit 223, the isolation unit 223 converts the control signal into an isolated control signal and transmits the isolated control signal to the driving unit 224, and the driving unit 224 converts the isolated control signal into a driving signal, so as to facilitate the on-off of the current in the coil of the first relay KM1.

[0057] With reference to Figure 2 The isolation unit 223 comprises an optical coupler U1, the input positive pole J of the optical coupler U1 is connected with a first pull-up resistor R2, the other end of the first pull-up resistor R2 is connected with the driving power supply VCC positive pole. The input negative pole K of the optical coupler U1 is connected with a second pull-up resistor R3, the other end of the second pull-up resistor R3 is connected with the common connection point of the first pull-up resistor R2 and the driving power supply VCC positive pole. Meanwhile, the output interface of the MCU is connected with the input negative pole K of the optical coupler U1.

[0058] With reference to Figure 2 The isolation unit 223 further comprises a second current-limiting resistor R4 and a third current-limiting resistor R5. One end of the second current-limiting resistor R4 is connected with the driving power supply VCC positive pole, and the other end of the second current-limiting resistor R4 is connected with the output positive pole L of the optical coupler U1. One end of the third current-limiting resistor R5 is connected with the output negative pole M of the optical coupler U1, and the other end of the third current-limiting resistor R5 is connected with the input end of the driving unit 224. The output negative pole M of the optical coupler U1 is further connected with a fourth current-limiting resistor R6, the other end of the fourth current-limiting resistor R6 is grounded, and the fourth current-limiting resistor R6 is connected in parallel with a second filter capacitor C2.

[0059] With reference to Figure 2, the driving unit 224 includes a triode Q1, a fifth current-limiting resistor R7, a sixth current-limiting resistor R8 and a light emitting diode D2. The triode Q1 is NPN type, the base b of the triode Q1 is connected to one end of the third current-limiting resistor R5 away from the optocoupler U1, the collector c of the triode Q1 is connected to the fifth current-limiting resistor R7, the other end of the fifth current-limiting resistor R7 is connected to the cathode of the light emitting diode D2, the anode of the light emitting diode D2 is connected to the positive electrode of the driving power supply VCC, and the collector c of the triode Q1 is also connected to the coil A port of the first relay KM1. The emitter e of the triode Q1 is grounded, one end of the sixth current-limiting resistor R8 is connected to the base b of the triode Q1, and the other end of the sixth current-limiting resistor R8 is connected to the emitter e of the triode Q1.

[0060] Referring to Figure 2 , the second protection module 23 includes a diode D1, the anode of the diode D1 is connected to the collector c of the triode Q1, and the cathode of the diode D1 is connected to the coil B port of the first relay KM1.

[0061] When the AC / DC converter is not connected to the external AC power supply, the input positive electrode J and the input negative electrode K of the optocoupler U1 are both at "1", at this time, the optocoupler U1 does not work, the base b of the triode Q1 is grounded and is at low level, at this time, the collector c and the emitter e of the triode Q1 are not conductive, the first relay KM1 is in the off state, the external power supply is not connected to the electronic display screen 1, and the electronic display screen 1 does not work.

[0062] When the operator connects the AC / DC converter to the external AC power supply through the switch, the AC / DC converter converts the external AC power supply into the first DC power supply, and the DC / DC converter converts the first DC power supply into the second DC power supply suitable for the MCU, so as to facilitate the work of the MCU. The MCU works at its output port to output a low-level signal "0".

[0063] That is, the input positive electrode J of the optocoupler U1 is at "1", the input negative electrode K of the optocoupler U1 is at "0", at this time, the optocoupler U1 works, the output positive electrode L and the output negative electrode M of the optocoupler U1 are conductive, the driving power supply VCC supplies power to the optocoupler U1, the output negative electrode M of the optocoupler U1 outputs a high level, and the high level output by the optocoupler U1 is transmitted to the base b of the triode Q1, so that the collector c and the emitter e of the triode Q1 are conductive.

[0064] That is, the coil A port of the first relay KM1 is grounded, at this time, the driving power supply VCC supplies power to the coil of the first relay KM1, so that the first relay KM1 works, the external power supply supplies power to the electronic display screen 1, and the electronic display screen 1 works.

[0065] Referring to Figure 1And Figure 3 The voltage stabilizing circuit 3 comprises a voltage boosting circuit 31 and a clamping circuit 32. The input end of the voltage boosting circuit 31 is connected with an auxiliary capacitor C3, one end of the auxiliary capacitor C3 is connected to the common connection point of the AC / DC converter and the normally open contact KM2-1 of the second relay KM2, and the other end of the auxiliary capacitor C3 is grounded. When the first relay KM1 works, the power supply circuit charges the auxiliary capacitor C3. When the first relay KM1 stops working and switches to the working of the second relay KM2, the auxiliary capacitor C3 facilitates the power supply of the electronic display screen 1, thereby reducing the probability of the electronic display screen 1 occurring "flash screen".

[0066] With reference to Figure 3 The input end of the voltage boosting circuit 31 is connected with one end of the normally open contact KM2-1 of the second relay KM2, and the output end of the voltage boosting circuit 31 is connected with the positive electrode interface of the electronic display screen 1. The second relay KM2 is located between the auxiliary capacitor C3 and the voltage boosting circuit 31. The voltage boosting circuit 31 and the electronic display screen 1 are both provided with a grounding interface. The clamping circuit 32 comprises a voltage stabilizing diode D3, the anode of the voltage stabilizing diode D3 is connected to the power connection positive electrode of the electronic display screen 1, and the cathode of the voltage stabilizing diode D3 is grounded.

[0067] In the embodiment of the application, the voltage value of the driving power supply VCC is adaptively changed according to the specific components connected.

[0068] Working principle:

[0069] When the active column is in a static state, the operator first makes the AC / DC converter communicate with the external alternating current power supply through the switch, so as to drive the control circuit 2 to work. Under the control of the control circuit 2, the driving power supply VCC supplies power to the coil of the first relay KM1, so that the coil of the first relay KM1 is connected with current, and then the first relay KM1 works, thereby connecting the power supply circuit with the electronic display screen 1, and at this time the electronic display screen 1 works.

[0070] At the same time, the first current limiting resistor R1 and the first filter capacitor C1 can protect the coil of the first relay KM1, thereby reducing the probability that the coil of the first relay KM1 is continuously heated and difficult to work normally due to the long-term direct power supply of the driving power supply VCC to the coil of the first relay KM1, so as to improve the stability and safety of the operation of the first relay KM1.

[0071] When the active column moves, the active column control board outputs a moving signal, at this time the operator can turn off the first relay KM1, the controller 4 receives the moving signal and controls the second relay KM2 to work, thereby making the voltage stabilizing circuit 3 supply power to the electronic display screen 1.

[0072] When the first relay KM1 stops working and switches to the second relay KM2, the auxiliary capacitor C3 facilitates power supply for the electronic display screen 1, thereby reducing the probability of "screen flashing" of the electronic display screen 1.

[0073] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A power control circuit based on a fixed column of mobile shelving, characterized in that: It includes a first relay KM1 and a power control circuit (2), wherein the normally open contact of the first relay KM1 is connected in series in the power circuit of the electronic display screen (1). The power control circuit (2) includes a drive power supply VCC, a first protection module (21), and a circuit control module (22); The first protection module (21) includes a current-limiting resistor R1 and a first filter capacitor C1. One end of the current-limiting resistor R1 is connected to the positive terminal of the drive power supply VCC, and the other end of the current-limiting resistor R1 is connected to one end of the coil of the first relay KM1. The first filter capacitor C1 is connected in parallel with the current-limiting resistor R1. The circuit control module (22) is connected to the other end of the coil of the first relay KM1 and is used to control the other end of the coil of the first relay KM1 to be grounded. The electronic display screen (1) is also connected to a voltage regulator circuit (3). The input end of the voltage regulator circuit (3) is connected to the power supply circuit, and the output end of the voltage regulator circuit (3) is connected to the power interface of the electronic display screen (1). The input end of the voltage regulator circuit (3) is connected in series with a second relay KM2. The second relay KM2 is connected to a controller (4). The controller (4) is connected to the moving column control board. When the moving column moves, the moving column control board outputs a moving signal. The controller (4) responds to the moving signal to control the second relay KM2 to work, so that the voltage regulator circuit (3) supplies power to the electronic display screen (1). An auxiliary capacitor C3 is also provided on the side of the second relay KM2 away from the voltage regulator circuit (3). One end of the auxiliary capacitor C3 is connected to the power supply circuit, and the other end of the auxiliary capacitor C3 is grounded.

2. The power control circuit based on the fixed column of the mobile shelving unit according to claim 1, characterized in that: The circuit control module (22) includes a control unit (222), an isolation unit (223), and a drive unit (224); Control unit (222) is used to output control signals; The isolation unit (223) is connected to the control unit (222) and the drive unit (224) respectively, and is used to isolate the control unit (222) and the drive unit (224), and outputs an isolation control signal when a control signal is received; The drive unit (224) outputs a drive signal when it receives an isolation control signal, which is used to drive the coil of the first relay KM1 to be energized / de-energized.

3. The power control circuit based on the fixed column of the mobile shelving unit according to claim 2, characterized in that: The control unit (222) includes an MCU, and the control unit (222) is connected to a voltage conversion unit (221) for powering the MCU; The voltage conversion unit (221) includes: An AC / DC converter is used to connect to an external AC power source and output the first DC power source. The DC / DC converter is connected to the AC / DC converter and the MCU respectively, and is used to connect to the first DC power supply and output a second DC power supply for the MCU to operate.

4. The power control circuit based on the fixed column of the mobile shelving unit according to claim 2, characterized in that: The driving unit (224) includes an NPN transistor Q1. The collector of the transistor Q1 is connected to the positive terminal of the driving power supply VCC through the fifth current-limiting resistor R7. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected to the output terminal of the isolation unit (223) to receive the isolation control signal. The coil of the first relay KM1 is used to connect one end of the driving unit (224) to the collector of the transistor Q1.

5. The power control circuit based on the fixed column of the mobile shelving unit according to claim 4, characterized in that: The isolation unit (223) includes an optocoupler U1. The positive input terminal of the optocoupler U1 is connected to the positive terminal of the driving power supply VCC through a first pull-up resistor R2, and the negative input terminal of the optocoupler U1 is connected to the positive terminal of the driving power supply VCC through a second pull-up resistor R3. The negative input terminal of the optocoupler U1 is also connected to the output interface of the MCU for receiving control signals; The positive output terminal of the optocoupler U1 is connected to the positive terminal of the drive power supply VCC through the second current-limiting resistor R4. The negative output terminal of the optocoupler U1 is connected to the base of the transistor Q1 through the third current-limiting resistor R5, and is used to output an isolation control signal. The negative output terminal of the optocoupler U1 is also grounded through the fourth current-limiting resistor R6, and the fourth current-limiting resistor R6 is connected in parallel with the second filter capacitor C2.

6. The power control circuit based on the fixed column of the mobile shelving unit according to claim 4, characterized in that: A second protection module (23) is provided between the circuit control module (22) and the first protection module (21). The second protection module (23) includes a diode D1. The anode of the diode D1 is connected to the collector of the transistor Q1, and the cathode of the diode D1 is connected to the common connection point of the current limiting resistor R1 and the coil of the first relay KM1.

7. The power control circuit based on the fixed column of the mobile shelving unit according to claim 4, characterized in that: A light-emitting diode (LED) D2 is connected between the fifth current-limiting resistor R7 and the driving power supply VCC. The anode of the LED D2 is connected to the positive terminal of the driving power supply VCC, and the cathode of the LED D2 is connected to the fifth current-limiting resistor R7.

8. The power control circuit based on the fixed column of the mobile shelving unit according to claim 1, characterized in that: The voltage regulator circuit (3) includes a boost circuit (31) and a clamping circuit (32). The clamping circuit (32) includes a Zener diode D3. The anode of the Zener diode D3 is connected to the positive terminal of the electronic display screen (1), and the cathode of the Zener diode D3 is grounded. The input terminal of the boost circuit (31) is connected to the power supply circuit through the second relay KM2, and the output terminal of the boost circuit (31) is connected to the power interface of the electronic display screen (1).

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