In 2012-2013, TCL's 26-inch and 32-inch LED LCD TVs utilized a power circuit board named PE061C3, which was developed in-house by TCL. The power supply system consists of two parts: the main power supply circuit and the standby power supply circuit, providing two output voltages: 3.3V/0.2A and 24V/2.1A. The main power supply employs Fairchild's PWM control chip, FAN6754A, which features an integrated green mode PWM controller to improve the efficiency of the flyback power converter. To minimize standby power consumption, the green mode introduces off-time modulation, reducing the switching frequency under light loads. This feature linearly decreases the fixed PWM frequency of 65kHz to 22kHz. The standby power circuit uses a DC-DC mini-board to directly convert the 12V voltage from the main power supply into 3.3V, powering the motherboard.
The design of this power supply demonstrates a strong focus on energy efficiency, particularly during periods of low load. By integrating advanced features such as the green mode, it ensures compliance with modern energy-saving standards while maintaining optimal performance. The inclusion of high-quality components like the MOS Power ICs and aluminum electrolytic capacitors further enhances the reliability and longevity of the power supply system. These innovations not only contribute to reduced operational costs but also align with global environmental goals by minimizing energy waste.
For instance, the industrial router crystal mentioned in the slides is specifically designed for compact applications, offering precise timing at 26MHz with minimal deviation. This level of precision is crucial for maintaining stable communication across various devices. Additionally, the use of inductance in the power supply ensures smooth current flow, preventing potential disruptions that could affect overall system performance.
Overall, the PE061C3 power circuit board exemplifies TCL’s commitment to innovation and sustainability in consumer electronics. It represents a significant advancement in power management technology, paving the way for more efficient and environmentally friendly products in the future.
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