Lighting technology mainly includes mainstream fluorescent lamps, LED lamps and HID technology. Its wide application makes the power drive topology very different. The common Flyback, Buck, Boost and other structures are widely used. Product design Whether advanced digital energy-saving control design is adopted, whether flexible topology applications such as flyback, Buck, and Boost are supported, the length of development cycle and time of market launch will determine the success or failure of the product. However, traditional lighting solutions are often implemented by dedicated devices. It is difficult to meet the needs of rapid development. Therefore, an excellent lighting platform solution undoubtedly needs to support flexible topology applications, and meet the dimming and networking requirements of today's mainstream lighting control solutions such as DALI, DMX512, 0-10V, wireless, and infrared.
Figure 2 is a reference scheme for the LED drive control application. In this scheme, only the comparator and PWM output linkage functions can be used to independently perform 3-way constant current control; by changing the internal reference voltage or PWM output setting, Dimming; and MCU supports a variety of sensors and DALI, DMX512, analog input and other communication interfaces, according to the external environment to choose the appropriate communication control program to achieve optimal control.
Figure 2-78K0/Ix2 LED Driver Control
The following is an example of a Flyback circuit for performing constant current control through a comparator.
Figure 3 - Flyback circuit constant current control
For the switching power supply, the PWM duty cycle determines the output voltage. As shown in Figure 3, after the circuit starts to work, the LED current is sampled and applied to the MCU's built-in comparator port, and compared with the reference value to generate an interrupt signal to adjust the duty of the PWM. The change process is shown in Figure 4. If the current is greater than the reference value, the duty cycle is reduced. Conversely, the duty cycle is increased, and finally a load current is dynamically stabilized.
For dimming, the 78K0/Ix2 series MCUs can be implemented in a variety of ways, by changing the comparator reference voltage or by using the timer TMH1 and PWM output linkage functions. In addition, Shiqiang Telecom's solution can also utilize the powerful data of the MCU. Processing computing power, constant current control through ADC functions and embedded algorithm control, while providing sufficient resources for MCU function expansion.
Figure 5 is an intelligent lighting platform solution embedded in the DALI protocol. The solution uses the MCU's built-in DALI bus interface communication module to complete the lighting dimming and networking of a single MCU, and realizes a high-performance DALI green energy-saving lighting system. Reference design for lighting manufacturers. The DALI slave system is mainly divided into two parts: the communication module and the LED drive control module, and the peripheral circuit design is simple.
Figure 5 - DALI slave system structure
BOOST power supply topology is adopted, the input voltage is directly driven to drive the LED lamp after the boosting; the load current is sampled, and the constant current control is realized by the embedded algorithm; the MCU has a built-in DALI communication interface, and is connected with the DALI host through the bus to realize mutual communication with the host, and complete The operation control command issued by the upper computer; the lamp temperature and illuminance sensor signals are added to the MCU port to realize abnormal detection protection.
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