Directed Energy, Inc.

            Can multiple voltage pulsers share one HV supply?

            If all the pulsers are to be operated at the same voltage, they can share a common supply. However, the user should be aware of a potential issue.


            Each voltage pulser contains an energy storage bank made of HV capacitors. The capacitor bank is wired to the pulser's HV input terminals through a small resistance. When multiple pulsers are connected to a single supply, their capacitor banks are essentially connected in parallel.

            When one of the pulsers generates a pulse, the energy that drives the load is removed from its storage bank. This energy will be replaced with energy from not only the HV supply, but -- depending on the wiring layout and other factors -- the other pulsers' storage banks as well. If energy is transferred back and forth among the pulsers, voltage dips on the HV supply line can result. At high currents and pulse frequencies, the dips may resemble noise.

            To avoid the problem, wire the HV inputs of each pulser directly to the HV supply in a hub-and-spoke manner. (If daisy-chain wiring were used instead, the resistance and inductance of the wire would encourage energy trading among the pulsers.) The hub-and-spoke system takes advantage of the HV supply's low output impedance to ensure it is the dominant energy source.

            If a noise problem persists, a small resistance can be placed in series with each HV line for isolation.


            Updated: 25 Feb 2019 07:23 AM
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