CN117440566A

CN117440566A - LED driving power supply based on double MCU architecture

Info

Publication number: CN117440566A
Application number: CN202311288455.3A
Authority: CN
Inventors: 张冰冰; 王小军; 张菲
Original assignee: Shenzhen Li Chuangpu Power Supply Technology Co ltd
Current assignee: Shenzhen Li Chuangpu Power Supply Technology Co ltd
Priority date: 2023-10-07
Filing date: 2023-10-07
Publication date: 2024-01-23

Abstract

The invention relates to an LED driving power supply based on a double MCU framework, which comprises an MCU1 working in a weak current environment, an MCU2 working in a strong current environment, an optocoupler module and an output module connected with a load; the optocoupler module is arranged between the MCU1 and the MCU2, so that the two MCUs can realize bidirectional communication and electric isolation; the MCU1 is used for receiving various weak current input signals to generate adjustment commands and sending the adjustment commands to the MCU2; the MCU2 is used for receiving the command, controlling the voltage and the current output to the load by the output module according to the regulation command, detecting the state output to the load and reporting the state data to the MCU1. The invention realizes high modularization of products, customization and access of various control modules or signals through the double MCU architecture, simultaneously avoids electric shock of users and ensures the use safety of the users.

Description

LED driving power supply based on double MCU architecture

Technical Field

The invention relates to the field of LED driving power supplies, in particular to an LED driving power supply based on a double MCU architecture.

Background

The current market demands for LED driving power supply show characteristics of customizable, control multi-way and intelligent. In one aspect, manufacturers and customers wish to be able to dynamically change various parameters of the power supply. On the other hand, the LED driving power supply can be connected with the light modulator and the sensor to realize intelligent light modulation, the light modulator and the sensor need to be contacted with a human body, if the light modulator and the sensor are directly connected to the MCU for controlling the power in the LED driving power supply as peripheral equipment, electric shock risks exist, and the use safety of a user is threatened. However, if simple isolation measures are adopted, the dimming precision is difficult to ensure; if complex isolation measures are adopted, the complexity and cost of the circuit are increased.

Disclosure of Invention

The invention aims to solve the technical problems that in order to meet the needs of frequent customers, the customizable and control multi-way functions of products are realized, the requirements of safe use of users are met, the standardization of software and hardware of the products is realized, and the LED driving power supply based on a double MCU architecture is provided.

The technical scheme adopted for solving the technical problems is as follows: the LED driving power supply adopting the double-MCU framework comprises an MCU1 working in a weak current environment, an MCU2 working in a strong current environment, an optocoupler module and an output module connected with a load;

the optocoupler module is arranged between the MCU1 and the MCU2, so that the two MCUs can realize bidirectional communication and simultaneously realize electrical isolation on two sides of the MCU;

the MCU1 is used for receiving various weak current input signals to generate adjustment commands and sending the adjustment commands to the MCU2;

the MCU2 is used for receiving a command of the MCU1, controlling the voltage and the current output to the load by the output module according to the regulation command, detecting the state output to the load, and reporting the state data to the MCU1.

Preferably, the MCU1 is further configured to store power parameters, where the power parameters are classified into key power parameters, normal power parameters, and read-only historical data.

Preferably, the MCU1 is further configured to communicate with a programmer or an upper computer for the latter to read and write the power supply parameters.

Preferably, the weak current input signal comprises a control signal, and the MCU1 is further configured to obtain the control signal from an external weak current signal input source; wherein, weak current signal input module includes: the intelligent mobile phone comprises a bus dimming module, a knob dimming module, a digital dimming module, a mobile phone APP local dimming input module, a cloud dimming module and a photoelectric or motion sensor module.

Preferably, serial communication is performed between the MCU1 and the MCU2 based on a preset application layer protocol.

Preferably, the optocoupler module comprises two optocoupler devices, which are respectively positioned on the transceiving signal lines between the two MCUs, so that bidirectional communication of the optocoupler devices is realized.

Preferably, the output module comprises a constant current unit, a current sampling unit and an output voltage sampling unit;

the output voltage sampling unit comprises a divider resistor R5 and a divider resistor R6;

the first end of the voltage dividing resistor R5 is connected to the constant current unit, the second end of the voltage dividing resistor R5 is connected to the ground through the voltage dividing resistor R6, and the voltage of the voltage dividing resistor R6 is fed back to AN A/D channel 0 pin AN0 of the MCU2 as divided output voltage;

the current sampling unit comprises a sampling resistor R0;

the sampling resistor R0 is connected in series between the negative end of the load and the ground, so that the node voltage of the sampling resistor R0 and the load is used as a voltage value reflecting the actual current and is fed back to the A/D channel 1 pin AN1 of the MCU 2.

The implementation of the invention has the following beneficial effects: the modularization of the product is realized through division of the MCU1 and the MCU2, the complexity of firmware is reduced, and the product development and evolution are facilitated. MCU1 generates the regulation command according to the input signal, and MCU2 is according to the electric current of regulation command control output to drive the LED load, and realize two MCU two-way communication and electrical isolation through the opto-coupler module, make MCU1 work in the weak current environment of isolation, thereby avoid the user to electrocute when contacting with the user, ensure the security that the user used.

Furthermore, the MCU1 is programmed to read and write the power supply parameters, so that the customization requirement of a user on the LED driving power supply is met, the types of hardware are reduced, and the production and logistics cost is reduced.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a functional block diagram of an LED drive power supply based on a dual MCU architecture in accordance with an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an LED driving power supply based on a dual MCU architecture according to an embodiment of the present invention.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, unless explicitly stated or limited otherwise, terms such as "connected," "configured," and the like should be construed broadly, and may be, for example, electrical connections or wireless communication signal connections; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The terms "first," "second," and the like are used merely for convenience in describing the present technology and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The above terms are merely for convenience of description and should not be construed as limiting the present technical solution.

In order to meet the needs of frequent customers, realize the customizable, traceability and output calibration of product functions, meet the requirements of safe use of users, and realize the standardization of software and hardware of the products, the invention provides an LED driving power supply based on a double MCU architecture.

In some embodiments, referring to fig. 1 and 2, the LED driving power supply based on the dual MCU architecture according to the embodiments of the present invention includes an MCU1 operating in a weak current environment, an MCU2 operating in a strong current environment, an optocoupler module 11, and an output module 12 connected to a load RL.

Wherein, MCU1 is powered by power supply Vdd 1; MCU2 is powered by power supply Vcc 1. The voltage ranges of the input power supplies Vdd1 and Vcc1 are respectively determined according to the model selected by the MCU1 and the MCU2; the types of MCU1 and MCU2 may be the same or different, and the voltage ranges of input power supply Vdd1 and input power supply Vcc1 may be the same or different. The optocoupler module is arranged between the MCU1 and the MCU2, and realizes two-way communication of the two MCUs and electric isolation of two sides of the two MCUs. The output module 12 generates higher voltage when driving the load RL, and has certain electric shock risk to human body, and the MCU2 is connected with the output module 12 and works in a strong electric environment communicated with the load RL. Because the optocoupler module has the electric isolation function on the MCU1 and the MCU2, the MCU1 works in an isolated weak current environment, so that human bodies and equipment can safely contact with peripheral circuits of the MCU1, and thus, electric shock of a user is avoided when the optocoupler module contacts with the user, and the use safety of the user is ensured.

Further, the optocoupler module 11 includes two optocoupler devices respectively located on two transceiver signal lines between the two MCUs, so as to implement bidirectional communication thereof.

In this embodiment, serial communication is performed between the MCU1 and the MCU2 based on a preset application layer protocol. The application layer protocol may employ a set of custom AT command sets to effect the transfer of data. The AT command set can be expanded according to the needs of users and is compatible with the earlier version, so that the AT command set and the firmware and hardware of the LED driving power supply product evolve together to adapt to the needs of different occasions, the universality of the product is realized, the powerful functions are realized, and the customization of the product is facilitated. The serial port communication is simple and reliable, easy to debug and convenient to realize the protocol.

The output module 12 includes a constant current unit, a current sampling unit, and an output voltage sampling unit.

The output voltage sampling unit includes a voltage dividing resistor R5 and a voltage dividing resistor R6. The first end of the voltage dividing resistor R5 is connected to the constant current unit, the second end of the voltage dividing resistor R5 is connected to the ground through the voltage dividing resistor R6, and the voltage of the voltage dividing resistor R6 is fed back to AN A/D channel 0 pin AN0 of the MCU2 as divided output voltage. The constant current unit comprises a constant current source and provides constant current for the load RL under the control of PWM signals transmitted by the MCU 2.

The current sampling unit comprises a sampling resistor R0. The sampling resistor R0 is connected in series between the negative terminal of the load and the ground, so that the node voltage of the sampling resistor R0 and the load is used as a voltage value reflecting the actual current and is fed back to the A/D channel 1 pin AN1 of the MCU 2. Alternatively, the current sampling unit can be formed by combining a plurality of resistors in series, in parallel or in a series-parallel mode, namely, the power of a single resistor is reduced in a voltage division or shunt mode, so that the damage caused by overpower is avoided, the current sampling unit is facilitated to collect a larger current value, the resistance adjustment flexibility of the sampling resistor can be improved, and the sampling accuracy is facilitated to be improved.

The calculation principle of the output current and the voltage is as follows: the resistance values of the voltage dividing resistor R5, the voltage dividing resistor R6 and the sampling resistor R0 are known, the voltage dividing resistor R6 is acquired by the MCU2, the total voltage applied to the voltage dividing resistor R5 and the voltage dividing resistor R6 can be calculated and used as the total voltage of the sampling resistor R0 and the load RL, and the output voltage and the actual current output to the load RL can be finally obtained according to the node voltage of the sampling resistor R0 acquired by the MCU2 and connected with the load RL.

The LED driving power supply based on the double MCU architecture divides the labor division of two MCUs, divides the complicated functions of the LED driving power supply in the prior art into corresponding parts by the two MCUs, makes firmware development become modularized and simplified, realizes the standardization of software and hardware of products, and simultaneously solves the electric shock risk caused by the fact that the LED driving power supply works under strong electricity and contacts with a control end of equipment for users.

The split tool body of the two controller MCU is as follows:

in this embodiment, the MCU1 is configured to receive various weak current input signals to generate an adjustment command and send the adjustment command to the MCU2; the MCU2 is used for receiving a command of the MCU1 and controlling the voltage and the current output to the load RL by the output module 12 according to the regulation command.

Specifically, the MCU1 is used as a master control, the MCU2 is controlled by the MCU1 through serial port communication, and is used as an executor to directly control output to the load RL: after the MCU1 receives various weak current input signals, the weak current input signals are converted according to a pre-customized conversion rule to obtain a regulation command, the regulation command is sent to the MCU2 through a transceiver signal line, and the MCU2 sends PWM signals with corresponding duty ratios to the constant current unit of the output module 12 according to the regulation command, so as to regulate the current and voltage output to the load RL by the output module 12. It should also be noted that, when the LED driving power supply according to the embodiment of the present invention is an un-dimmable power supply, the adjustment command is used to control the LED load RL to be turned on and off; when it is a dimming power supply, the adjustment command may be used to control the LED load RL to be turned on, off, or to emit light of different brightness, etc.

In an alternative embodiment, the weak current input signal received by the MCU1 includes a control signal, and the MCU1 is further configured to obtain the control signal from an external weak current signal input source; wherein, weak electric signal input sources include but are not limited to: the mobile phone comprises a bus dimming module, a knob dimming module, a digital dimming module, a mobile phone APP local dimming input module, a cloud dimming module, a photoelectric sensor or motion sensor module and the like.

Specifically, the MCU1 may be connected to one or more external weak current signal input sources to receive one or more control signals, and when receiving multiple control signals, it is further necessary to distinguish priorities of different control signals according to a preset logic rule, and then generate an adjustment command for the MCU2 according to a corresponding control requirement, so as to control on-off time, brightness, color development, color variation, and the like of the LED load RL, thereby achieving the purpose of intelligent lighting control. In addition, the weak current signal input sources are used as peripheral devices to be connected with the MCU1 working in a weak current environment, and when the weak current signal input sources are in contact with a human body, the risk of electric shock to a user can be avoided.

Alternatively, the bus dimming module may employ a DALI bus; the knob dimming module can adopt a knob dimmer with 0-10V or 1-10V, and different gears are set through knob rotation; the digital dimming module can adopt a digital sectionalizer or a digital remote controller; the mobile phone APP local dimming input module can adopt a mobile phone with the function of the Internet of things, and a user can set different gears on the mobile phone APP; the cloud dimming module is a dimming module based on cloud computing; the intelligent dimming is realized by sensing the change of ambient light through the photoelectric sensor or collecting the activity information of the user through the motion sensor. The implementation of the above-described dimming approach may be referred to the prior art.

In an alternative embodiment, the MCU2 is also configured to detect the status of the output to the load and report status data to the MCU1. Specifically, the status data includes, but is not limited to, operational data such as current, voltage, temperature, operational duration, operational anomalies, etc. that power the load RL. For example, the MCU2 detects the output voltage and the actual current of the LED driving power supply in real time as a detector, and reports the detected output voltage and actual current to the MCU1 periodically. And when the MCU1 judges that the abnormality occurs, storing the information of the working abnormality into the EEPROM or the Flash. The time interval of periodic reporting is once every 100ms, and the time interval can be set to other durations as required.

In an alternative embodiment, the MCU1 is also used to store power supply parameters. In particular, the MCU1 stores power supply parameters in EEPROM or Flash which control the functions and performance indicators of the power supply, for example to enable customizable, traceability and output calibration of the product functions. For example, these power supply parameters may include input/output voltage ranges, overvoltage thresholds, etc. for controlling the operation of the drive power supply, as well as historical operating information for the power supply.

Further, the MCU1 is also used for communicating with a programmer or an upper computer so as to read and write power supply parameters of the programmer or the upper computer. Specifically, the power supply parameters are read and written by externally connecting a special programmer or a computer running special software so as to set the power supply parameters, know the parameter setting of the power supply or trace back the historical use condition of the power supply. Therefore, manufacturers only need to develop and produce a few types of LED driving power supplies as standard hardware to select in various application occasions, then compile specific power supply parameters according to customer requirements, and write the specific power supply parameters into the MCU1 to meet the customer requirements, so that the types of the power supplies can be remarkably reduced, the production, test and logistics storage pressures are reduced, the risk of product backlog is eliminated, the products can be more quickly pushed to the market, and the competitiveness of the products is improved.

The LED power supply provided by the embodiment of the invention is highly flexible and customizable, is convenient for adjusting and calibrating various parameters of the product to meet the requirements of specific users, reduces the types of the product and BOM materials, is convenient for storage and material management, has good safety, and can greatly improve the competitiveness of the product.

It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The LED driving power supply based on the double MCU architecture is characterized by comprising an MCU1 working in a weak current environment, an MCU2 working in a strong current environment, an optocoupler module and an output module connected with a load;

2. The dual MCU architecture based LED driving power supply of claim 1, wherein the MCU1 is further configured to store power supply parameters that control the power supply's function and performance metrics.

3. The LED driving power supply based on the dual MCU architecture of claim 2, wherein the MCU1 is further configured to communicate with a programmer or an upper computer for the latter to read and write the power supply parameters.

4. The LED driving power supply based on the dual MCU architecture of claim 1, wherein the weak current input signal comprises a control signal, the MCU1 further configured to obtain the control signal from an external weak current signal input source; wherein, weak current signal input source includes: the intelligent mobile phone comprises a bus dimming module, a knob dimming module, a digital dimming module, a mobile phone APP local dimming input module, a cloud dimming module and a photoelectric or motion sensor module.

5. The LED driving power supply based on the dual MCU architecture of claim 1, wherein serial communication is performed between the MCU1 and the MCU2 based on a preset application layer protocol.

6. The LED driving power supply based on the dual MCU architecture of claim 1, wherein the optocoupler module comprises two optocoupler devices, and the two optocoupler devices are respectively located on the transceiving signal lines between the two MCUs, so as to realize bidirectional communication between the MCU1 and the MCU 2.

7. The dual MCU architecture-based LED driving power supply of claim 1, wherein the output module comprises a constant current unit, a current sampling unit and an output voltage sampling unit;

the current sampling unit comprises a sampling resistor R0;