Development of High Density High Voltage Power Supply for Phased Array Transmitters

In the fields of electronic warfare airborne applications, the High Voltage Power Supply (HVPS) of phased array transmitters must have the characteristics of high power density and stable dc output voltage for driving mini TWTs. The high voltage stability of HVPS is known critical to keep the directivity of phased array transmitters which is easily affected by the phase noise of RF output. This paper describes the development and the test results of high-density 3 kW HVPS that generates output voltage of -4.05 kdc. The HVPS makes use of a newly designed a high power density pulse transformer with operating frequency of 100 kHz and compact modulators in order to acquire a high density one. And another idea is devised by using the resonant ZCS converter to reduce the noise or ripples of -4 kdc high voltage. The resonant ZCS is designed to use the resonance of serial connection with a capacitor and the pulse transformer´s inner leakage inductance. This paper presents the configuration of HVPS for the phased array transmitter, as well as the test results of pulse transformer´s secondary winding the perfect rectangular output waveforms. And also, the waveforms of switching on/off voltage (in the range 0 V to -1 kV) of compact modulators featured of the fast switching time are presented.