Analysis and overhaul Yongshenghong FSP241-4F01 power supply principle (on) - Power Circuit - Circuit Diagram

    The technical details provided here focus on the FSP241-4F01 switching power supply, part of the Yongshenghong FSP series, specifically designed for 37 to 42-inch LCD TVs. This power supply unit plays a crucial role in providing stable energy to various components within these televisions. The output voltage socket pin functions are detailed in Table 1. Some of the LCD TV models utilizing this power supply include CHD-TD370F8, CHD-W370F8, CHD-W370F8P, LT37f8N, and LT3788. The circuit design of the FSP241-4F01 is quite comprehensive, featuring an incoming line anti-interference circuit and a bridge rectifier filter circuit, along with PFC (power factor correction) formation and voltage output circuits. There’s also a current pulse width modulation circuit, a half-bridge frequency modulation main power output circuit, a synchronous rectifier circuit, grid voltage and PFC voltage detection circuits, a 5VSTB standby voltage generation circuit (a sub-power supply), an open/standby control circuit, and overvoltage protection circuits. One notable aspect of the FSP241-4F01 is its use of the IR2184S+TDA4863G+200A6 solution, as seen in Figures 1 and 2. This power supply generates four distinct voltage outputs: the inverter power supply provides 24V at 9A, the audio supply delivers 12V at 4A, the small signal supply offers 5V at 3A, and the standby power supply provides 5VSTB at 1A. The voltage flow block diagram can be found in the accompanying image. The initial stage of the circuit involves incoming line anti-interference and bridge rectifier filter processes. Here, the AC voltage of 220V first encounters the fuse F1 and then moves into the overvoltage protection and anti-interference system, which includes the varistor Z1, capacitors CY1, CY2, CY3, CY4, CX1, and resistors R1, R2, along with inductors FL1-FL3. These elements work together to filter out high-frequency interference from the AC power supply. The varistor Z1 helps prevent AC overvoltage, while CY1, CY2, CY3, CY4 act as common-mode capacitors to suppress asymmetric interference, and CX1 serves as a differential-mode capacitor to address symmetric interference. Subsequently, the power flows into the bridge rectifier filter circuit formed by BD1 and L1, C2, C3, C4, D1, C1, generating a DC voltage of approximately 300V that is sent to the standby power circuit. The anti-jamming and bridge rectification filter circuit is illustrated in Figure 4. This power supply not only ensures efficient operation but also integrates robust safety features to protect against potential electrical hazards, making it a reliable choice for modern LCD TVs. The comprehensive design and multiple protective mechanisms make the FSP241-4F01 a standout solution in its category.

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