In a television receiver having a switched mode power controller 60, this controller may be deflected equalized to generate a pulse on the power transformer X1. To power the controller at startup, the storage capacitance C5 on the controller's power input before the internal power is started is applied to the voltage rectified from the AC main 22 to charge the storage capacitor during the first polar phase of the AC main. It is coupled via current limiting resistors R2 and V1. In order to reduce the power consumption after the initial connection of the television receiver to the AC mains, the current limiting resistor comprises a + temperature coefficient (PTC) element V1 which increases the impedance upon heating. In addition, diode D7 is coupled in the current path to the storage capacitor to charge the capacitor with the same polarity as in the opposite polarity phase of the AC mains. The two paths for capacitor charging allow a relatively small value for the current limiting resistors (R2, V1), which remain coupled to the storage capacitor (C5) and are controlled by the controller (60) without undue power consumption over a wide range of power mains voltages. Enough power).
展开▼
