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日立CMT2588/2988等大屏幕彩电开关电源,采用以TDA4601控制集成块(德国西门子公司产品)为核心的串联式自激振荡型开关电源电路,振荡频率为16～76kHz(见图1)。开关电源电路特点是:(1)对电网电压的适应性强:可以适用市电90～260V、频率50Hz/60Hz电源电压;(2)具有完善的过压、过流保护功能;(3)冷、热底板隔开,主电路板地不带电;(4)有4组电压输出:+B(115V行电源),+28V(伴音功放电源),+12V(低压集成电路电源)和+5V(CPU电源)。
Hitachi CMT2588 / 2988 and other large screen color TV switching power supply, using TDA4601 control block (Germany’s Siemens products) as the core series of self-oscillating switching power supply circuit, the oscillation frequency of 16 ~ 76kHz (see Figure 1). Switching power supply circuit features are: (1) strong adaptability to grid voltage: 90 ~ 260V power supply can be applied, the frequency of 50Hz / 60Hz power supply voltage; (2) has a perfect over-voltage, over-current protection function; (4) 4 voltage outputs: + B (115V line power), + 28V (sound power amplifier), + 12V (low voltage integrated circuit power) and + 5V CPU power).