Power Supply Technology

With the development of power supply technology, high-frequency switching power supply control from the initial analog circuitry gradually developed to microprocessors, DSPs and other highly integrated control devices, these devices are small in size, high precision, but the switching power supply within the electromagnetic interference, radiation relative to other communications equipment working environment is stronger, which puts forward higher requirements for auxiliary power.

　  In the current intelligent switching power supply, there are organic microprocessor or DSP, for in-machine monitoring and communication. Microprocessor chip on the power supply requirements are very high, the amplitude is quite stable, but not with a large spike burr, resulting in electromagnetic interference, and the auxiliary power supply is required to adapt to the AC than the normal operation of the rectifier range is wider. When the rectifier is connected to the AC input power, it must be the monitoring part of the first normal work, self-test and a variety of conditions to determine whether the rectifier can be turned on; in case of extremely high or low AC voltage, the rectifier has stopped working, but the monitoring part of the normal work, to maintain normal monitoring and communication.

　　Certain power supply products have appeared in the operation process of the phenomenon of unexplained reset, etc., in the high-power switching power supply auxiliary power supply design, its analysis, and found that its auxiliary power supply in the different AC input voltage, under different load conditions, there are more problems: narrow range of AC adaptability, load capacity is low, the work of the waveform is unstable and extremely asymmetric, the emergence of bias magnetism, electromagnetic interference, such as extremely serious.

　　General switching power supply rectifier auxiliary power supply operating principle is: input AC rectified into high-voltage DC, and then become a low-voltage high-frequency square wave by the conversion circuit, and then by the rectifier filtering circuit to become a smooth low-voltage DC required by the system, generally by the three-terminal voltage regulator regulator, from a DC output to provide a high-frequency converter to drive the pulse control loop of the voltage feedback signal.

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