Production of high frequency outdoor power supply

A block diagram of high frequency power supply (HFPS) is presented in Fig. 1. The major difference compared to the mains frequency power supply is the much higher operational frequency, 25-50 kHz vs 50/60 Hz. The HFPS is fed from the three phase mains. The input voltage is rectified and supplied to a transistor-bridge configuration.

In order to meet the requirement of power supply for high-precision output voltage, the design of high power supply adopts the method of combining H-bridge cascaded topology with carrier phase shift PWM control scheme, which can effectively improve output voltage waveform in the design of high power supply.

HIGH VOLTAGE POWER SUPPLIES A HVPS is a low voltage power supply with some special high voltage sub circuits and parts. This means that many circuits within a HVPS are similar the low voltage power supply. Similar circuits include the input filter, switcher, control and built-in test equipment (BITE) and automatic test equipment (ATE).

High-frequency power supplies (HFPS) were originally introduced on the ESP market in 1993 . An evaluation of the experiences gained during the first decade of operation was presented in . Many publications have been made since the introduction of this technology, some examples are [3-5].

The availability of high frequency power supplies for ESPs are discussed. Results of reliability measurements on a new transformer design show a meantime between failures exceeding 200 yrs. Fig. 15. LCC circuit diagram III. AVAILABILITY The availability of ESPs operating in power plants or in industrial processes is of great importance.

In the field of high voltage power supply applications, there is often a contradiction between the power supply capability and the switching frequency of high power switching devices. Limited by switching loss, the switching frequency of high power switching devices is low, which will generate a lot of harmonic in the output voltage.