HVP High Voltage Solid State Switch HTS 60-1000-SCR Design Instructions
The high-voltage switching current depends on the time, and the thyristor is a thyristor.
In contrast to classic disc thyristor switches, which have very limited DV DT and DI DT capabilities, fast thyristor switch modules consist of a large number of smaller thyristor chips (up to 1000 individual thyristor chips) connected in parallel and series, so that the DV DT and DI DT values can be effectively split into non-critical values for individual thyristors.
Each thyristor is ignited by its own highly synchronized and isolated gate driver.
This allows for very short gate routing and avoids dangerous hot spots, such as those known in classic thyristor switch designs.
Equipment. High peak current capability.
High congestion tolerance.
Easy to trigger with a simple TTL trigger pulse (2-5 V).
Technical parameters. Maximum voltage (kV)6
Peak current (a) 10000
Peak power (mw) 60
On-time ( s)35....
Case size (mm3) 122 x 64 x 31
Illustrate. These solid-state switches are designed for high-voltage, high-peak-current switching applications such as piezoelectric drivers, flash lamp drivers, crowbar circuits, and surge generators. The switching module described here was developed on the basis of a special type of thyristor (silicon-controlled rectifier) with a very high inrush current capability. Each switch module consists of a large number of these thyristors connected in series and parallel. Very fast and synchronous opening of all thyristors is driven by a special low impedance drive circuit, which also provides galvanic isolation from the control input. The internal current path is optimized to account for stray inductance, allowing the rate of change of the on-current to be allowed. Compared to traditional high-voltage switches such as spark gaps, tubes, gas discharge tubes, and mechanical switches, the HTS-SCR series thyristor switches have very low jitter and stable switching characteristics, regardless of temperature and age. Mean time between failures (mean time between failures) is several orders of magnitude higher than that of conventional high-voltage switches.
Devise. Anti-interference control circuitry provides signal conditioning, auxiliary voltage monitoring, frequency limiting, and temperature protection. Under incorrect operating conditions, the switch immediately shuts down and generates a fault signal. A special synchronous input allows for the parallel interconnection of up to 50 switching modules to increase the on-peak current of a single module. The switch is triggered by a forward signal of 3 to 10 volts.
The triggered SCR switch remains on until the load current falls below the hold current (typical thyristor behavior). The shutdown process requires current commutation, current limiting, or current bypass. In most discharge applications, the shutdown process can simply be performed by keeping the charge current of the energy storage capacitor lower than the hold current of the switch. Charging currents above the hold current require a bypass switch, preferably with MOSFET technology.
HVP High Voltage Solid State Switch HTS 60-1000-SCR Design Instructions