In radar navigation equipment, a high-voltage, narrow-pulse, strong-power pulse source is essential for the transmitting part. This pulse source operates with various repetition frequencies. To achieve this, a high-voltage power supply raises the mains power to levels ranging from several kilovolts to tens of kilovolts of DC high voltage. Subsequently, a modulator is used to modulate the DC high voltage into a pulse source that meets the desired pulse width and frequency for the launch tube.
The pulse source is comprised primarily of two key components, namely a high-voltage power supply and a modulator. The high-voltage power supply employs a switching regulated power supply, with the modulator incorporating a solid-state modulator made from semiconductor devices. It is this combination of advanced technologies that make the pulse source so effective at generating the powerful pulses required for a variety of applications. By ensuring that both high voltage and precise modulation are achieved, the pulse source is able to deliver unparalleled performance and efficiency in a wide range of industrial and scientific settings.
Before applying the TTL level trigger pulse signal to the input isolation transformer, it is essential to include an interface circuit that pre-amplifies the signal and matches it to the transformer. This ensures effective isolation and optimal performance of the system. To power the interface circuit, the user can provide the necessary power supply specifications, while the manufacturer designs the appropriate transformer and filter circuits within the circuit. This facilitates seamless integration into the overall system, enhancing its overall efficiency and reliability.
Once the trigger pulse is isolated by the pulse transformer, it undergoes pulse-shaping from the preconditioner and proceeds to power amplification, enabling the modulation board and tail board to function. The preconditioner generates an excitation pulse that is then isolated by the transformer to drive each FET of the modulation board. This allows the modulation board to conduct the high-voltage power supply and feed it to the anode of the microwave triode. Consequently, the cathode electrons of the microwave triode initiate emission, and the triode begins to amplify the low-power high-frequency signal received at the input terminal into a high-power high-frequency signal. As the pulse concludes, the preconditioner produces a truncated pulse which triggers the truncated tail plate. Activation of the tail plate enables the release of the distributed capacitance of the microwave triode, resulting in the attainment of a well-defined trailing edge for the pulse.
