LED control circuit, elevator control system and elevator
By designing LED control circuits in the elevator control system and optimizing MCU port resources by using the start-up module and voltage divider module, the problem of tight MCU port resource allocation is solved, and more efficient circuit design and cost savings are achieved.
Patent Information
- Application Number
- CN202421711606.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-07-18
AI Technical Summary
In the elevator control system, the resource allocation of the input port and output port of the MCU is tight, resulting in limited control system development.
A LED control circuit is designed, including an MCU, a start-up module, an indicator light module and a voltage divider module. By setting up two sets of sub-circuits in the indicator light module, and optimizing the port resource allocation of the MCU with the start-up module and the voltage divider module, the same port controls two sets of indicator lights.
It improves the utilization rate of MCU ports, improves the problem of resource allocation tightness, and reduces circuit design costs.
Smart Images
Figure CN223194869U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and in particular to an LED control circuit, an elevator control system, and an elevator. Background Art
[0002] In elevator control systems, the elevator car top panel communicates with the main board and the car interior panel. Each communication circuit between them is equipped with a communication indicator light. However, in actual applications, the main board's MCU often has multiple communication circuits. This leads to resource constraints on the MCU's input and output ports, hindering further development of the control system. Therefore, there are still technical issues that need to be resolved in the related art. Utility Model Content
[0003] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.
[0004] Therefore, an object of the embodiments of the present application is to provide an elevator control system with an LED control circuit and an elevator. This solution can improve the resource allocation shortage of the MCU's input and output ports, increase the utilization rate of the MCU ports, and save development costs.
[0005] In order to achieve the above-mentioned technical objectives, the technical solution adopted in the embodiment of the present application includes: an LED control circuit, including an MCU, a starting module, an indicator light module and a voltage divider module; wherein the indicator light module includes a first resistor, a second resistor, a first light-emitting diode and a second light-emitting diode; one end of the first resistor and the cathode of the second light-emitting diode are connected to the voltage divider module, the other end of the first resistor is connected to the anode of the first light-emitting diode, and the cathode of the first light-emitting diode is connected to the first output end of the MCU; one end of the second resistor is connected to the starting module, the other end of the second resistor is connected to the anode of the second light-emitting diode, and the starting module is connected to the first output end of the MCU.
[0006] In addition, the LED control circuit according to the above embodiment of the present invention may also have the following additional technical features:
[0007] Furthermore, in an embodiment of the present application, the startup module includes a first-stage startup unit and a second-stage startup unit; the first-stage startup unit is connected to the second-stage startup unit; and the second-stage startup unit is connected to one end of the second resistor.
[0008] Furthermore, in an embodiment of the present application, the first-stage startup unit includes a sixth resistor, an eighth resistor, a first capacitor and a second transistor; one end of the sixth resistor is connected to the first output end of the MCU; the other end of the sixth resistor, one end of the eighth resistor and one end of the first capacitor are connected to the base of the second transistor; the other end of the eighth resistor, the other end of the first capacitor and the emitter of the second transistor are grounded, and the collector of the second transistor is connected to the second-stage startup unit.
[0009] Furthermore, in an embodiment of the present application, the second-stage startup unit includes a third resistor, a fifth resistor and a first transistor; one end of the fifth resistor is connected to the collector of the second transistor, and the other end of the fifth resistor and a point of the third resistor are connected to the base of the first transistor; the other end of the third resistor and the emitter of the first transistor are connected to the first power supply; and the collector of the first transistor is connected to one end of the second resistor.
[0010] Furthermore, in the embodiment of the present application, the first transistor is a PNP transistor.
[0011] Furthermore, in an embodiment of the present application, the voltage divider module includes a fourth resistor and a seventh resistor; one end of the fourth resistor is connected to the first power supply, the other end of the fourth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is grounded, and the negative electrode of the second light-emitting diode is connected to the other end of the fourth resistor.
[0012] Furthermore, in the embodiment of the present application, the resistance value of the fourth resistor is equal to the resistance value of the seventh resistor.
[0013] Furthermore, in an embodiment of the present application, the voltage value of the first power supply is 5V.
[0014] On the other hand, an embodiment of the present application further provides an elevator control system, comprising an LED control circuit as described above.
[0015] On the other hand, an embodiment of the present application further provides an elevator, comprising the elevator control system as described above.
[0016] The advantages and benefits of this application will be partially given in the following description, and partially become apparent from the following description, or learned through practice of this application:
[0017] The present application can provide a startup module between the MCU and the indicator light module, and divide the indicator light module into two groups of indicator light sub-circuits. The two sub-circuits are connected in opposite ways, so that one group of indicator light sub-circuits can be connected to a port of the MCU through the startup module, and the other group of indicator light sub-circuits can be directly connected to the same port of the MCU. Both groups of indicator light sub-circuits are connected to the voltage divider module, thereby enabling the MCU to control two indicator lights through the same port. The present application can improve circuit adaptability and improve the defect of tight resource allocation of the MCU's output port, thereby reducing the cost of circuit design. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a module schematic diagram of an LED control circuit in a specific embodiment of the present utility model;
[0019] Figure 2 This is a schematic diagram of the circuit structure of an LED control circuit in a specific embodiment of the present utility model;
[0020] Figure 3 This is a structural diagram of an LED control circuit in another specific embodiment of the present invention. DETAILED DESCRIPTION
[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings to illustrate the LED control circuit, elevator control system, and elevator principles and processes in the embodiments of the present invention.
[0022] Reference Figure 1 The present application provides an LED control circuit. The circuit may include an MCU 1, a startup module 2, an indicator light module 3, and a voltage divider module 4. The indicator light module 3 may include a first resistor R4, a second resistor R5, a first light-emitting diode D1, and a second light-emitting diode D2.
[0023] One end of the first resistor R4 and the cathode of the second light-emitting diode D2 can be connected to the voltage divider module 4, the other end of the first resistor R4 can be connected to the anode of the first light-emitting diode D1, and the cathode of the first light-emitting diode D1 can be connected to the first output terminal PA of the MCU 1. One end of the second resistor R5 can be connected to the startup module 2, the other end of the second resistor R5 can be connected to the anode of the second light-emitting diode D2, and the startup module 2 can be connected to the first output terminal PA of the MCU 1.
[0024] Further, refer to Figure 2 The startup module 2 may include a first-stage startup unit 21 and a second-stage startup unit 22. The first-stage startup unit 21 may be connected to the second-stage startup unit 22. The second-stage startup unit 22 may be connected to one end of the second resistor R5.
[0025] Further, refer to Figure 2 The first-stage startup unit 21 may include a sixth resistor R6, an eighth resistor R8, a first capacitor C1, and a second transistor Q2. One end of the sixth resistor R6 may be connected to the first output terminal PA of the MCU1. The other end of the sixth resistor R6, one end of the eighth resistor R8, and one end of the first capacitor C1 may be connected to the base of the second transistor Q2. The other end of the eighth resistor R8, the other end of the first capacitor C1, and the emitter of the second transistor Q2 are grounded, and the collector of the second transistor Q2 may be connected to the second-stage startup unit 22.
[0026] Further, refer to Figure 2 The second-stage startup unit 22 may include a third resistor R1, a fifth resistor R3, and a first transistor Q1. One end of the fifth resistor R3 may be connected to the collector of the second transistor Q2, and the other end of the fifth resistor R3 and a point of the third resistor R1 may be connected to the base of the first transistor Q1. The other end of the third resistor R1 and the emitter of the first transistor Q1 may be connected to a first power supply VCC. The collector of the first transistor Q1 may be connected to one end of the second resistor R5.
[0027] Further, refer to Figure 2 The first transistor Q1 is a PNP transistor, and the second transistor Q2 can be an NPN transistor.
[0028] Further, refer to Figure 2 The voltage divider module 4 may include a fourth resistor R2 and a seventh resistor R7. One end of the fourth resistor R2 may be connected to the first power supply VCC, the other end of the fourth resistor R2 may be connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 may be grounded, and the cathode of the second light-emitting diode D2 may be connected to the other end of the fourth resistor R2.
[0029] Further, refer to Figure 2 , the resistance of the fourth resistor R2 may be equal to the resistance of the seventh resistor R7.
[0030] Further, refer to Figure 2 , the voltage value of the first power supply VCC is 5V.
[0031] The implementation principle of this application is explained below with reference to the accompanying drawings.
[0032] The LED control circuit of this embodiment is shown in the attached figure Figure 3As shown, the control circuit consists of an MCU, a control module, a resistor divider module, and a communication indicator light module. The control module includes a third resistor R1, a fifth resistor R3, a first transistor Q1, a sixth resistor R6, an eighth resistor R8, a first capacitor C1, and a second transistor Q2. One end of the sixth resistor R6 can be connected to the first output terminal PA of the MCU1. The other end of the sixth resistor R6, one end of the eighth resistor R8, and one end of the first capacitor C1 can be connected to the base of the second transistor Q2. The other end of the eighth resistor R8, the other end of the first capacitor C1, and the emitter of the second transistor Q2 are grounded. The collector of the second transistor Q2 can be connected to one end of the fifth resistor R3. The other end of the fifth resistor R3 and a point of the third resistor R1 can be connected to the base of the first transistor Q1. The other end of the third resistor R1 and the emitter of the first transistor Q1 can be connected to the power supply VCC. The collector of the first transistor Q1 can be connected to one end of the second resistor R5. The voltage of VCC is 5V.
[0033] The communication indicator light module may include a first resistor R4, a second resistor R5, a first light-emitting diode D1, and a second light-emitting diode D2. One end of the first resistor R4 and the cathode of the second light-emitting diode D2 may be connected to the voltage divider module 4. The other end of the first resistor R4 may be connected to the anode of the first light-emitting diode D1. The cathode of the first light-emitting diode D1 may be connected to the first output terminal PA4 of the MCU. One end of the second resistor R5 may be connected to the startup module 2. The other end of the second resistor R5 may be connected to the anode of the second light-emitting diode D2. The startup module 2 may be connected to the first output terminal PA4 of the MCU.
[0034] The resistor divider module may include a fourth resistor R2 and a seventh resistor R7. One end of the fourth resistor R2 may be connected to a power supply VCC. The other end of the fourth resistor R2 may be connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 may be grounded. The cathode of the second light-emitting diode D2 may be connected to the other end of the fourth resistor R2.
[0035] In this embodiment, the MCU uses the DAC digital-to-analog converter function of the output terminal PA4 to achieve the output of voltages in different ranges, thereby achieving the function of controlling the transistor Q2. The output voltage of the PA4 terminal is UPA4. When UPA4 is 0V, the voltage between the base and emitter of the transistor Q2 is 0V, and the PN junction voltage is 0V. At this time, the transistor Q2 is in the cut-off state, and the collector and emitter of Q2 are not conducting. When the output voltage of the PA4 terminal gradually increases, when When the junction is at the conduction voltage, the transistor Q2 is in the on state, and the collector and emitter of Q2 are connected to GND.
[0036] In the control module, when PA4 outputs 0V, the collector and emitter of transistor Q2 are left floating. At this point, the PN junction voltage of transistor Q1 is 0V, putting it in the off state. The voltage at the left end of resistor R5 is also 0V. When PA4 outputs a voltage value of U1, the collector and emitter of transistor Q2 are connected to GND, forming a loop between R1, R3, and GND. At this point, the voltage across R1 is greater than the PN junction voltage, turning transistor Q1 on. The voltage at the left end of R5 is 5V, which is VCC.
[0037] In the resistor divider module, the 5V VCC power supply and resistors R2 and R7 form a loop. The cathode of D2, that is, the voltage across the resistor R7 is And R2=R7, that is, the voltage across resistor R7 is 2.5V.
[0038] In the communication indicator light module, the conduction voltage of the light emitting diode D1 and the light emitting diode D2 is 2V.
[0039] When the output voltage of PA4 is 0V, the voltage at the right end of R4 is 2.5V, the cathode voltage of LED D1 is 0V, the voltage at the left end of R5 is 0V, the cathode voltage of LED D2 is 2.5V, the voltage VF of LED D1 is 2.5, which is greater than the conduction voltage of 2.0V, and the voltage VF of LED D2 is -2.5, which is less than the conduction voltage of 2.0V. Therefore, LED D1 is on and LED D2 is off.
[0040] When the output voltage of PA4 is 3.3V, the voltage at the right end of R4 is 2.5V, the cathode voltage of LED D1 is 3.3V, the voltage at the left end of R5 is 5V, the cathode voltage of LED D2 is 2.5V, the voltage VF of LED D1 is -0.8, which is less than the conduction voltage of 2.0V, and the voltage VF of LED D2 is 2.5, which is greater than the conduction voltage of 2.0V. Therefore, LED D1 is off and LED D2 is on.
[0041] When the output voltage U2 of PA4 is greater than 0.5V, less than When , the voltage at the right end of R4 is 2.5V, the cathode voltage of LED D1 is U2, the voltage at the left end of R5 is 0V, the cathode voltage of LED D2 is 2.5V, the voltage VF of LED D1 is 2.5-U2 which is less than the conduction voltage 2.0V, the voltage VF of LED D2 is -2.5V which is less than the conduction voltage 2.0V, so LED D1 is off and LED D2 is off.
[0042] When an object moves rapidly, the human eye can retain the image for approximately 0.1-0.4 seconds after it disappears. This phenomenon is known as persistence of vision. This allows the present embodiment to simultaneously illuminate LEDs D1 and D2 when PA 4 rapidly switches between voltages of 0V, 3.3V, and U2.
[0043] In addition, an embodiment of the present application further provides an elevator control system, which may include one or more LED control circuits described in any of the above embodiments.
[0044] It should be noted that the contents of the above-mentioned LED control circuit embodiment are all applicable to the embodiment of the elevator control system. The functions specifically implemented by the embodiment of the elevator control system are the same as those of the above-mentioned LED control circuit embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned LED control circuit embodiment.
[0045] In addition, an embodiment of the present application further provides an elevator, which may include one or more elevator control systems described in any of the above embodiments.
[0046] It should be noted that the contents of the above-mentioned elevator control system embodiment are all applicable to this elevator embodiment. The functions specifically implemented by this elevator embodiment are the same as those of the above-mentioned elevator control system embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned elevator control system embodiment.
[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "switch" should be understood in a broad sense, for example, it can be a transformation or a conversion; for ordinary technicians in this field, the specific meaning of the above terms in the present invention can be understood according to specific circumstances.
[0048] In this specification, references to specific terms refer to specific structures or features described in conjunction with an embodiment or example as being included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0049] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
[0050] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.
Claims
1. An LED control circuit, characterized in that: include: MCU, startup module, indicator light module and voltage divider module; Wherein, the indicator light module includes a first resistor, a second resistor, a first light emitting diode and a second light emitting diode; One end of the first resistor and the cathode of the second light-emitting diode are connected to the voltage divider module, the other end of the first resistor is connected to the anode of the first light-emitting diode, and the cathode of the first light-emitting diode is connected to the first output end of the MCU; one end of the second resistor is connected to the startup module, the other end of the second resistor is connected to the anode of the second light-emitting diode, and the startup module is connected to the first output end of the MCU.
2. The LED control circuit according to claim 1, characterized in that: The startup module includes a first-stage startup unit and a second-stage startup unit; the first-stage startup unit is connected to the second-stage startup unit; and the second-stage startup unit is connected to one end of the second resistor.
3. The LED control circuit according to claim 2, characterized in that: The first-stage startup unit includes a sixth resistor, an eighth resistor, a first capacitor and a second transistor; one end of the sixth resistor is connected to the first output end of the MCU; the other end of the sixth resistor, one end of the eighth resistor and one end of the first capacitor are connected to the base of the second transistor; the other end of the eighth resistor, the other end of the first capacitor and the emitter of the second transistor are grounded, and the collector of the second transistor is connected to the second-stage startup unit.
4. The LED control circuit according to claim 3, characterized in that: The second-stage startup unit includes a third resistor, a fifth resistor and a first transistor; one end of the fifth resistor is connected to the collector of the second transistor, and the other end of the fifth resistor and a point of the third resistor are connected to the base of the first transistor; the other end of the third resistor and the emitter of the first transistor are connected to a first power supply; and the collector of the first transistor is connected to one end of the second resistor.
5. The LED control circuit according to claim 4, characterized in that: The first transistor is a PNP transistor.
6. The LED control circuit according to claim 1, characterized in that: The voltage divider module includes a fourth resistor and a seventh resistor; one end of the fourth resistor is connected to the first power supply, the other end of the fourth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is grounded, and the cathode of the second light-emitting diode is connected to the other end of the fourth resistor.
7. The LED control circuit according to claim 6, characterized in that: The resistance of the fourth resistor is equal to the resistance of the seventh resistor.
8. The LED control circuit according to claim 6, characterized in that: The voltage value of the first power supply is 5V.
9. An elevator control system, characterized in that: The LED control circuit comprises the LED control circuit according to any one of claims 1 to 8.
10. An elevator, characterized in that: Comprising the elevator control system according to claim 9.