Position indication LED drive control circuit

Abstract

The embodiment of the utility model provides a position indication LED drive control circuit. The position indication LED drive control circuit comprises a main control chip, an LED drive circuit, an LED state detection circuit, a power conversion circuit and a controller area network CAN bus drive circuit. The position indication LED driving control circuit serves as a network node to be distributed in an industrial grade CAN bus network, remote on-off and dimming control of an LED lamp can be achieved, detection of the working state of the lamp can also be achieved, and the working state of the lamp is uploaded to a CAN communication network. The position indication LED driving control circuit is mainly used for displaying the position state of the equipment.

Description

Technical Field

[0001] The present application relates to the technical field of LED drive control, and in particular to a position indicating LED drive control circuit. Background Art

[0002] At present, the centralized control of light-emitting diode (LED) lamps is realized by mostly using a network structure to connect the LED lamps as network nodes to a centralized control device called a "server" in the form of a "client", and the control method is relatively limited. Utility Model Content

[0003] The embodiment of the present application provides a position indicating LED drive control circuit, comprising: a main control chip, an LED drive circuit, an LED state detection circuit, a power conversion circuit and a controller area network CAN bus drive circuit, wherein the main control chip is connected to the LED drive circuit, the LED state detection circuit, the CAN bus drive circuit and the power conversion circuit, and the LED drive circuit is connected to the LED state detection circuit;

[0004] The power conversion circuit is used to connect to a power source;

[0005] The LED driving circuit is used to connect to the LED light source;

[0006] The CAN bus driving circuit is used to connect to the host computer;

[0007] The main control chip can receive the LED light source control information sent by the host computer through the CAN bus, and can control the LED driving circuit according to the LED light source control information to realize the switching and dimming control of the LED light source.

[0008] In some embodiments, when the LED light source is in the on state, the main control chip processes the position information sent by the host computer and received through the CAN bus to control the switch of the LED light source, thereby visually informing people of the current position status;

[0009] In some embodiments, when the LED light source is in the on state, the LED state detection circuit detects the state of the LED light source and transmits the information to the main control chip. The main control chip sends the information to the CAN bus through the CAN bus drive circuit according to the received state and transmits it to the host computer for processing.

[0010] In some embodiments, the power conversion circuit can convert the power to power the LED drive control circuit.

[0011] In some embodiments, the LED status detection circuit is used to detect the working status of the LED light source.

[0012] In some embodiments, it also includes: a buzzer alarm circuit, which is used to drive the buzzer alarm circuit to provide an alarm prompt when the main control chip obtains the location information settlement through the CAN bus and determines that the current location status poses a hidden danger to the safety of the device.

[0013] In this application, the position indicating LED driving control circuit is distributed as a network node in the industrial CAN bus network, which can realize remote switching and dimming control of LED lamps, and can also detect the working status of the lamps and upload the working status of the lamps to the CAN communication network. The position indicating LED driving control circuit is mainly used to display the position status of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0015] Figure 1 This is the composition diagram of the position indication LED drive control circuit;

[0016] Figure 2 is the position distribution of LED light sources;

[0017] Figure 3 This is the LED drive control circuit diagram;

[0018] Figure 4 This is the LED status detection circuit diagram;

[0019] Figure 5 It is the power conversion circuit diagram;

[0020] Figure 6 This is the circuit schematic diagram of the main control chip;

[0021] Figure 7 This is the CAN bus driver circuit diagram;

[0022] Figure 8 This is the buzzer alarm circuit diagram. DETAILED DESCRIPTION

[0023] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0024] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0026] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] The position indicating LED drive control circuit in this patent is distributed as a network node in the industrial CAN bus network, which can realize remote switching and dimming control of LED lamps, as well as detection of the working status of the lamps, and upload the working status of the lamps to the CAN communication network. The position indicating LED drive control circuit is mainly used to display the position status of the device.

[0028] The present application embodiment provides a position indicating LED driving control circuit, such as Figure 1 As shown, it includes: a main control chip, an LED driving circuit, an LED state detection circuit, a power conversion circuit and a controller area network CAN bus driving circuit. The main control chip is connected to the LED driving circuit, the LED state detection circuit, the CAN bus driving circuit and the power conversion circuit, and the LED driving circuit is connected to the LED state detection circuit.

[0029] The power conversion circuit is used to connect the power supply.

[0030] The LED driving circuit is used to connect the LED light source.

[0031] The CAN bus driver circuit is used to connect to the host computer.

[0032] The main control chip can receive the LED light source control information sent by the host computer through the CAN bus, and can control the LED drive circuit according to the LED light source control information to realize the switching and dimming control of the LED light source.

[0033] In some embodiments, when the LED light source is in the on state, the main control chip processes the position information sent by the host computer and received via the CAN bus to control the switch of the LED light source, thereby visually informing people of the current position status.

[0034] In some embodiments, when the LED light source is in the on state, the LED state detection circuit detects the state of the LED light source and transmits the information to the main control chip. The main control chip sends the information to the CAN bus through the CAN bus drive circuit according to the received state and transmits it to the host computer for processing.

[0035] In some embodiments, the power conversion circuit can convert the power to power the LED driving control circuit.

[0036] In some embodiments, the LED status detection circuit is used to detect the working status of the LED light source.

[0037] In some embodiments, it also includes: a buzzer alarm circuit, which is used to drive the buzzer alarm circuit to provide an alarm prompt when the main control chip obtains the location information settlement through the CAN bus and determines that the current location status poses a hidden danger to the safety of the device.

[0038] The functions of the position indication LED drive control circuit include:

[0039] a) Position indication LED drive control circuit can display the current position status of the device.

[0040] b) The position indication LED drive control circuit receives the switch and dimming control instructions sent by the host computer through the CAN bus to realize the switch and dimming control of the LED light source.

[0041] c) The position indication LED drive control circuit receives the position information sent by the host computer through the CAN bus, and controls the switch of the LED light source according to the received position information.

[0042] d) The position indication LED drive control circuit detects the working status of the LED light source (normal, open circuit, short circuit) in real time and sends the status information to the host computer through the CAN bus.

[0043] e) The position indication LED drive control circuit receives the alarm information sent by the host computer through the CAN bus, and controls the buzzer to sound an alarm according to the received alarm information.

[0044] f) The position indication LED drive control circuit can achieve 1-64 levels of dimming.

[0045] The logic control of the position indication LED drive circuit is as follows:

[0046] After the position indication LED drive control circuit is powered on, the main control chip circuit receives the LED light source control information sent by the host computer through the CAN bus, and the main control chip outputs a PWM waveform to control the LED drive circuit to realize the switch and dimming control of the lamp. When the lamp is in the on state, the main control chip processes the position information sent by the host computer received through the CAN bus to control the switch of the lamp, thereby visually informing people of the current position status. While the lamp is in the on state, the LED state detection circuit detects the state of the LED light source and transmits the information to the main control chip. The main control chip sends the information to the CAN bus through the CAN bus drive circuit according to the received state and transmits it to the host computer for processing.

[0047] Figure 2 The figure shows the position distribution of the position indicating LED light sources. The position indicating LED driving circuit is used to inform people of the swing information of the current device. Light source LED1 is located in the center position. Lighting up LED1 indicates that the current device is in a non-swinging state; when the device tilts forward (similar to a car going uphill), light sources LED2 and LED3 will light up according to the forward tilt angle, for example, when the forward tilt angle is less than 5°, LED2 will be lit, and when the forward tilt angle is greater than 5°, LED3 will be lit; when the device tilts backward (similar to a car going downhill), light sources LED4 and LED5 will light up according to the backward tilt angle, for example, when the backward tilt angle is less than 5°, LED4 will be lit, and when the backward tilt angle is greater than 5°, LED5 will be lit; when the device tilts to the left (similar to a car rolling over to the left), light sources LED6~LED9 will light up. It lights up according to the left tilt angle, for example, when the left tilt angle is less than 2°, LED6 is lit, when the left tilt angle is greater than 2° and less than 4°, LED7 is lit, when the left tilt angle is greater than 4° and less than 5°, LED8 is lit, and when the left tilt angle is greater than 5°, LED9 is lit; when the device tilts to the right (similar to a car rolling over to the right), light sources LED10 to LED13 will light up according to the right tilt angle, for example, when the right tilt angle is less than 2°, LED10 is lit, when the right tilt angle is greater than 2° and less than 4°, LED11 is lit, when the right tilt angle is greater than 4° and less than 5°, LED12 is lit, and when the left tilt angle is greater than 5°, LED13 is lit.

[0048] In some embodiments, LED1 is a green light, LED2, 4, 6, 7, 10, 11 are yellow lights, and LED3, 5, 8, 9, 12, 13 are red lights.

[0049] The working principle of the position indication LED drive circuit is as follows:

[0050] LED drive circuit

[0051] LED drive circuit Figure 3 As shown. The LED drive circuit uses the TLE4241GM chip. The TLE4241GM is an integrated adjustable constant current source that provides an adjustable output current through different methods (PWM, reference resistor, SET), which is almost independent of load and power supply voltage changes. The built-in protection circuit prevents damage to the device in case of overload short circuit, polarity reversal and overtemperature. The connected LED can be protected from overvoltage up to 45V, and the status output allows handling of open loads and short circuits at the main output.

[0052] Connecting an external resistor to GND at the REF pin can generate a reference voltage inside the chip. When the SET pin is connected to a high logic level voltage, the output current is inversely proportional to the external resistor at the REF pin:

[0053]

[0054] When PWM is used as the input of TLE4241GM, the brightness of the LED can be adjusted by the duty cycle of the PWM waveform. In addition, when the PWM input is a low level with a duty cycle of 100%, the TLE4241GM chip will be in sleep mode. In sleep mode, the TLE4241GM chip will consume less than the current. The PWM input is independent of the other pins of the TLE4241GM chip module, so the PWM pin input can be used as the enable port of the chip.

[0055] LED status detection circuit

[0056] The LED status detection circuit detects the positive terminal of the LED driver through the resistor R 24 With resistor R 37 The voltage is divided, then passes through the OPA333AIDBV chip, and then through the resistor R 50 With capacitor C 13 The first-order filter circuit formed transmits the collected voltage to the main control chip. The AD conversion circuit inside the main control chip converts the received voltage to the TTL level that the chip can recognize, and then determines the working state of the LED. For example, when the voltage value received by the chip is greater than DC2.7V, the LED is judged to be in an open circuit fault state; when the voltage value received by the chip is less than DC0.4V, the LED is judged to be in a short circuit fault state; when the voltage value received by the chip is greater than DC0.4V and less than DC2.7V, the LED is judged to be in a normal working state.

[0057] Power conversion circuit

[0058] The power module VRB4824LD-30WR3 converts DC48V into DC24V for the LED driver chip to drive the LED light source load. The LM2575 power module converts DC24V into DC5V as the enable control level of the LED front-end PWM input. The LM1117IMPX power module converts DC5V into DC3.3V to power the main control chip and peripheral chips. When the power conversion circuit works normally, the +3V3 working indicator light and the A3V3 working indicator light are on.

[0059] Main control chip

[0060] Figure 6 The figure shows the schematic diagram of the main control chip. The main control chip uses the STM32F103ZET6 series chip, which provides a CAN2.0B interface, which can be connected to the CAN communication function based on the industrial standard CAN bus to realize the control of LED light sources. The STM32F103ZET6 chip provides 8 timers, of which TIM1~TIM5 and TIM8 are advanced timers, which can control the LED driver chip to realize the switching and dimming of the LED light source by capturing and comparing the output PWM waveform. The STM32F103ZET6 chip has 3 ADC peripheral interfaces, which can detect 15 voltage values ​​through pin multiplexing, and can be used to detect the working status of the LED light source.

[0061] The DIP switch circuit provides an ID for the main control chip, which is used to distinguish other position indication LED control devices on the bus. The 4-bit DIP switch can realize 16 kinds of IDs to ensure that the IDs of the control devices do not conflict. In order to effectively observe the working status of the LED light source, 3 LED indicators are designed on the periphery of the main control chip, which can realize the indication function of different modes, making it convenient for debuggers to observe the status of the board. When the WORK indicator is always on, it means that the main control chip is working normally. The SHORT indicator and the OPEN indicator are used to display the working status of the LED light source.

[0062] CAN bus driver circuit

[0063] The CAN bus driver circuit uses the CTM8251KAT chip, such as Figure 7 As shown. The position indicator LED driver circuit uses only the CTM8251KAT chip to realize the isolated CAN bus transceiver circuit. CTM8251 is a universal CAN bus transceiver chip with isolation. The chip integrates all necessary CAM isolation and transceiver devices. The main function of the chip is to convert the logic level signal of the CAN controller into the differential level of the CAN bus. The maximum transmission baud rate supported by the chip is 1Mbit / s, and it has high immunity to electromagnetic interference.

[0064] Buzzer alarm circuit

[0065] The buzzer alarm circuit is used when the main control chip obtains the location information through the CAN bus and determines that the current location status poses a hidden danger to the safety of the equipment. The main control chip will drive the buzzer alarm circuit to realize the alarm prompt. The buzzer alarm circuit can drive two buzzers. When the main control chip outputs a high level, the transistor Q2 is turned on, and then M1 is turned on, and then the buzzer is driven to sound an alarm.

[0066] interface

[0067] For details on the external connectors and pin definitions of the driver board, see Table 1.

[0068]

[0069]

[0070] Table 1 Driver board external connector and pin definition

[0071] In order to reduce electromagnetic response, the buck LED drive control circuit takes electromagnetic compatibility into consideration at the initial stage of design, and is integrated into circuit design, component selection, structural process and layout. For the suppression and processing of electromagnetic interference, several methods such as weakening interference sources and filtering are mainly adopted. For example, the power line and control line are arranged separately, the signal cable and power cable are arranged separately, the AC line and DC line are arranged separately, and a certain creepage distance is left between the lines.

[0072] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0073] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A position indicating LED driving control circuit, characterized in that: include: A main control chip, an LED driving circuit, an LED state detection circuit, a power conversion circuit and a controller area network CAN bus driving circuit, wherein the main control chip is connected to the LED driving circuit, the LED state detection circuit, the CAN bus driving circuit and the power conversion circuit, and the LED driving circuit is connected to the LED state detection circuit; The power conversion circuit is used to connect to a power source; The LED driving circuit is used to connect to the LED light source; The CAN bus driving circuit is used to connect to the host computer; The main control chip can receive the LED light source control information sent by the host computer through the CAN bus, and can control the LED driving circuit according to the LED light source control information to realize the switching and dimming control of the LED light source.

2. The position indicating LED driving control circuit according to claim 1, characterized in that: When the LED light source is in the on state, the main control chip processes the position information sent by the host computer and received via the CAN bus to control the switch of the LED light source, thereby visually informing people of the current position status.

3. The position indicating LED driving control circuit according to claim 2, characterized in that: When the LED light source is in the on state, the LED state detection circuit detects the state of the LED light source and transmits the information to the main control chip. The main control chip sends the information to the CAN bus through the CAN bus drive circuit according to the received state and transmits it to the host computer for processing.

4. The position indicating LED driving control circuit according to claim 1, characterized in that: The power conversion circuit can convert the power supply to power the LED drive control circuit.

5. The position indicating LED driving control circuit according to claim 1, characterized in that: The LED state detection circuit is used to detect the working state of the LED light source.

6. The position indicating LED driving control circuit according to claim 1, characterized in that: Also includes: The buzzer alarm circuit is used to drive the buzzer alarm circuit to provide an alarm prompt when the main control chip obtains the location information through the CAN bus and determines that the current location status poses a hidden danger to the safety of the equipment.

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