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一、主开关电源工作原理厦华 TM—2975/2980型彩电开关电源采用了西门子公司2000年推出的绿色环保和高效节能电源控制器 N501(TDA16846),其内集成了 PWM/PFC(有源功率因数校正)功能,与 V501(MOSFET)功率管配合组成最优化的反激式软开关电源,可工作在自由振荡调整、固定振荡频率或外同步三种模式,且工作频率随负载减轻自动连续降低,具有十分完善的保护功能。由 TDA16846组成的开关电源原理电路如图1所
First, the principle of the main switching power supply Xiamen Overseas Chinese TM-2975/2980-type color TV switching power supply using the Siemens 2000 launched a green and efficient energy-saving power controller N501 (TDA16846), which integrates PWM / PFC (active power Factor correction) function, combined with the V501 (MOSFET) power tube to form the optimal flyback soft-switching power supply, can work in free-oscillation adjustment, fixed oscillation frequency or external synchronization three modes, and the operating frequency automatically decreases continuously with the load reduction , Has a very perfect protection. By TDA16846 switching power supply principle circuit shown in Figure 1