The Function of Stabilized Power Supply in Medium Wave Broadcasting
Here we mainly introduce the regulated power supply system composed of SBW(S)-GD (three-phase microcomputer-controlled (digital) special voltage stabilizer for radio and television) and SGB (three-phase dry-type lightning protection isolation transformer).
The role of the microcomputer-controlled voltage stabilizer is to change the access size of the cylindrical winding in the transformer through the servo motor, sprocket, and chain when the voltage of the external power supply network fluctuates or the load changes, so as to automatically maintain the output voltage. stable device. It is characterized by large capacity, high efficiency, no waveform distortion, stable voltage regulation, strong control function, can withstand instantaneous overload, can be used continuously for a long time, can realize manual control and automatic control at will, and has overvoltage, undervoltage, overvoltage Current, phase sequence, lack of phase automatic protection function.
The isolation transformer can change the voltage, and can also isolate the input winding and output winding from each other on the electrical appliance, so as to avoid the danger of touching the charged body, the charged metal parts due to insulation damage, and the grounding at the same time. In addition, it also has a certain effect of suppressing various interferences. For example, if the lightning protection device is connected, when the lightning is introduced into the isolation transformer through the cables of the high-voltage and low-voltage parts, the device will introduce the lightning into the discharge system buried in the ground, effectively preventing the possible damage caused by the lightning to the transmitter, control system and signal source. damage to the system etc. is minimized.
Both systems are equipped with automatic and manual operation, and you can choose which operation method to control the power supply and distribution system. At the same time, they are also equipped with a bypass system to ensure that when the system or equipment has a hardware failure that cannot be repaired temporarily, the low-voltage power supply can be directly sent to the corresponding broadcast transmission equipment to ensure the smooth progress of the broadcast work.
The nature of broadcasting determines that when medium-wave broadcasting is launched, the signal interruption transmission time is calculated in seconds. The power supply and distribution system is at the core of the entire AM broadcasting system, and the stability of voltage is the key to ensuring the transmitter, signal source, control system, etc. Only by ensuring the safe, reliable and stable operation of the power system can we have The normal operation of subsequent systems and equipment. Therefore, the regulated power supply system composed of a voltage stabilizer and a lightning protection isolation transformer is an important guarantee for the quality, reliability and stability of medium-wave broadcasting.
