the pulse of the future directed energy incorporated PVX-4150 1,500v pulse generator 0 to 1500v pulse output <25nsriseandfalltimes <60ns to dc pulse width >240khz pulse repetition frequency optimizedtodrivedeflectionplates, grids and other capacitive loads protected against arcs, shorts and load transients voltage and current monitor outputs the PVX-4150 pulse generator produces fast, high voltage wave forms to 1,500v. optimized for high impedance ca- pacitive loads, the PVX-4150 is well suited for driving ex- traction grids and deflection plates for electrostatic modu- lation of particle beams in time-of-flight mass spectrome- ters and accelerators. its robust and versatile design also makes it well suited for pulsing or gating power tube grids, pockels cells and q switches, acoustic transducers, mi- crochannel plates, photomultiplier tubes and image intensi- fiers. the exceptional pulse fidelity of the PVX-4150 will optimize the performance of any system in which it is used. the PVX-4150 generates an output voltage pulse of 1,500 volts with rise and fall times less than 25ns, with very flat voltage pulses to dc into a capacitive load. it can generate singled-ended output pulses from ground to +1500v or from ground to C1500v, and can also generate pulses originating from a dc voltage offset from ground by using both vlow and vhigh power supply inputs. this offset can be from C1500v to +1500v, with a maximum power supply voltage differential of 1500v. the PVX-4150 requires a ttl gate signal, a high voltage dc power supply and optional dc offset supply inputs. the output pulse width and frequency are controlled by the gate signal. the pulse output voltage is controlled by the amplitude of the input dc power supplies. when the input gate is high, the v high supply is connected to the output. when the input gate is low, the v low supply is connected to the output. therefore the PVX-4150 can be used to generate a negative-going pulse by logically inverting the input gate, so that the input gate is high until the unit is pulsed. when the input gate goes low, the v low input supply is connected to the output, thereby generating a negative-going pulse. the PVX-4150 features front panel indicator leds to moni- tor the status of the pulse generator. front panel voltage and current monitors provide a straightforward means to view the output voltage and current waveforms in real-time, eliminating the need for an external high voltage oscillo- scope probe. the pulse generator is a direct-coupled, air-cooled solid- state half-bridge (totem pole) design, offering equally fast pulse rise and fall times, low power dissipation, and virtually no over-shoot, under-shoot or ringing. it has over-current detection and shut-down circuitry to protect the pulse gen- erator from potential damage due to arcs and shorts in the load or interconnect cable. all control and protection logic circuitry, support power, energy storage and output network are incorporated into the PVX-4150. it can be connected directly to the load, and does not require series or shunt re- sistors, impedance-matching networks between the pulser and the load, or additional energy storage (capacitor banks). all of this is taken care of within the PVX-4150.
the pulse of the future directed energy, inc. 2401 research blvd., suite 108 fort collins, co usa 80526 970-493-1901 fax: 970-493-1903 email: deiinfo@directedenergy.com web: http://www.direct edenergy.com specifications (all specifications measured into a 50pf load connected with 6 feet (~1.8m) of rg-62 (93 w) coaxial cable) output maximum value: 1500 volts (v high -v low ) minimum value: 0 volts means of adjustment: controlled by power supply input voltages pulse rise and fall time: <25ns, typically <20ns (10% to 90%) pulse width: <60ns to dc, controlled by input gate pulse recurrence frequency (prf): single shot to 240khz at 1500v continuous output, maximum limited by power dissipation (1) ,5mhzburst, controlled by input gate max. average power: 150w (v high +v low ), derated at 2w/c over 25c am- bient (1) max. duty cycle: continuous droop: <1% over/undershoot: <5% throughput delay 120ns typical jitter: <1ns shot-to-shot output connector & cable: shv, with 6 feet (~1.8m) rg-62 (93 w) coaxial cable input dc voltage +v in (v high ) absolute max. value: +1500 volts absolute min. value: -1500 volts relative max. value: +1500 volts over v low voltage relative min. value: +0v over v low voltage input dc voltage -v in (v low ) absolute max. value: +1500 volts absolute min. value: -1500 volts input dc connectors: shv, rear panel (one each for +v in and -v in ) gate gate source & connector ttl into 50 w, into bnc connector on the front panel voltage & current monitors voltage monitor: 1000:1 into 1 meg w , bnc connector current monitor: 10a/v into 50 w , bnc connector general support power: 90vac to 240vac, 50/60hz dimensions (excluding con- nectors): 19 w x 5.2 h x 13 d (48.25cm w x 13.2cm h x 33cm d) weight (approximate): 18 lbs. (8.2 kilograms) specifications subject to change without notice these specifications are measured driving a 50pf load connected with 6 feet of rg-62 cable, at 1500v output. however the PVX-4150 can drive loads of a few picofarads to several hundred picofarads of capacitance, limited by its maximum power dissipation capability (1) . at lower load capacitances and/or voltages less then 1500v, the PVX-4150 can operate at continuous pulse recurrence frequencies above 240khz. the PVX-4150 can also drive resistive or inductive loads, within limitations. contact dei for additional information and applications assistance. (1) the power dissipated in the PVX-4150 when driving a capacitive load is defined by the for- mula cv 2 f, where c is the total load capacitance, including the capacitance of the load, inter- connect cable, and the internal capacitance of the PVX-4150, v is the pulse voltage, and f is the pulse repetition frequency (or the total pulses per second). (for these calculations, the inter- nal capacitance of the PVX-4150 is 200pf, and rg-62 cable is 13pf/foot.) given the maximum dissipation of 150w, the maximum load capacitance, frequency and/or voltage at which the PVX-4150 can operate can be approximated using this formula. this formula also approxi- mates the high voltage power supply requirements needed to drive a given load at a specific voltage and frequency. this formula is not applicable when driving resistive or inductive loads. 18ns rise & fall times, 1500v output (10ns/div horizontal scale, 300v/div vertical scale) 244khz frequency, 1500v output (2.5s/div horizontal scale, 300v/div vertical scale) doc #9200-0209 rev 2 ? directed energy, inc. 2000 <60ns minimum pulse width, 1500v output (25ns/div horizontal scale, 300v/div vertical scale) typical output waveform, 1500v (1s/div horizontal scale, 300v/div vertical scale)
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