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UltraVolt HVPS Output-Current Monitor

From UltraVolt, Inc.
 

 

UltraVolt's high-voltage power supplies (HVPSs) have an output-current monitor (Iout Monitor), which allows the total output current of the HV multiplier to be monitored. Note, since the sense circuit is in the return path to the transformer, the current-monitor signal has a sign opposite of the sign of the HVPS. Therefore, a negative HVPS has a positive current-monitor voltage and a positive HVPS has a negative current-monitor voltage.

The current monitor is generated via an internal sense circuit and brought to the output pin through an isolation resistor. The signal can be integrated by connecting a small capacitor between the Iout Monitor and the Signal Ground Return to form an R*C with the internal isolation resistor. The isolation resistor varies with the HVPS series as does the internal sense-circuit impedance, which varies from model to model. The “A” Series has a 15kΩ, 1% isolation resistor. The 60W-, 125W-, and 250W-“C” Series units have a 5kΩ, 1% isolation resistor. The 20W- and 30W-“C” Series units have no isolation resistor because pin 3 is used for grounding (to achieve boost). The Iout Monitor output impedance is therefore very low (varying from 22Ω to <1Ω depending on the model).

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Topics of Interest
UltraVolt's high-voltage power supplies (HVPSs) have an output-current monitor (Iout Monitor), which allows the total output current of the HV multiplier to be monitored. Note, since the sense circuit... (Read More)
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