Trigger transformer

Abstract: A compact, solid state, high voltage switch capable of high conduction current with a high rate of current risetime (high di/dt) that can be used to replace thyratrons in existing and new applications. The switch has multiple thyristors (30) packaged in a single enclosure. Each thyristor has its own gate drive circuit that circuit obtains its energy from the energy that is being switched in the main circuit. The gate drives are triggered with a low voltage, low current pulse isolated by a small inexpensive transformer (33). The gate circuits can also be triggered with an optical signal, eliminating the trigger transformer altogether. This approach makes it easier to connect many thyristors in series to obtain the hold off voltages of greater than 80kV.

Abstract: A solid-state repetition linear transformer driver (LTD) for a high-power microwave (HPM) driver is constructed, comprising a total of 50 stage-series structures, with each stage possessing eight parallel bricks. This article describes the primary and secondary circuit differences between a driving source and a modern LTD, as well as analyzing the influence of load impedance on system efficiency in a simplified circuit of the LTD using a Laplace transform. This article also examines the optimum load impedance for a given magnetic core and primary circuit. The current load impedance of one stage is $2~\Omega $ , and the corresponding system efficiency is 95%. A real-time control and triggering system are developed. A trigger transformer with a 100-channel pulse output is designed. The output voltage of the constructed driving source is about 500 kV, the current is 5 kA, the pulsewidth is about 125 ns, and the output power is 2.5 GW. The driving source can work at a repetition rate of 50 Hz. The driving source will drive a low magnetic field relativistic backward-wave oscillator to generate HPMs.

Abstract: We designed and build a rapid capacitor charger for 10 Hz, 500 J/shot operation of a low-inductance, compact Marx generator. The charger uses a hard-switched IGBT H-Bridge Inverter, which drives a 30 kHz, nano- crystalline step-up transformer. The transformer, in addition to the high-voltage rectifier and a trigger- transformer are contained in a section which is filled with transformer oil. The main circuit board also contains a solid-state Marx generator to trigger the main Marx generator. We also implemented a self-powered HV-feedback sensor to stop the charge process precisely at the target voltage. This new sensor greatly enhanced the rep-rated performance of the Marx by preventing pre-fires, since it enabled us to charge aggressively without overshooting the target voltage and have more time for spark-gap recovery.

Abstract: PURPOSE: To miniaturize an inductance element of a filtering circuit part of an inverter circuit without deteriorating lighting property of a discharge lamp by increasing oscillation frequency of an output control apparatus for a converter at the time of discharge starting. CONSTITUTION: When a d.c. power source 1 current is applied, a control output Vcc starts running from an auxiliary electric power source 2 and an output control apparatus 6 of a converter starts driving. Successively a converter circuit 3 starts driving and generates primary voltage E1 . In this case, the impedance of a discharge lamp 10 is extremely high and in insulated state. After that, a trigger circuit 9 starts driving and generates high voltage trigger pulses for discharge start from a trigger transformer 8 and applies the pulses to the discharge lamp. Consequently, breakdown occurs in the discharge lamp 10 and glow discharge is generated. Then, in the discharge lamp 10, the impedance quickly lowers and output voltage of a inverter circuit 7 makes lamp current flowing and thus output voltage of the circuit 3 lowers to E1 . Finally, in the discharge lamp 10, the glow discharge changes to arc discharge and the lamp voltage is raised and stabilized.