Know-how

The voltage either generated from the mains using a high-voltage transformer or synthetically via an electronic source. When transformed from the mains, the sine wave of voltage is voltage influenced by the sine wave of the mains. The electronic source produces a very pure sine wave and a very low distortion factor, as the voltage is generated, checked, and regulated voltage a signal processor.

AC – directly from the mains

DC – Single-phase rectification

  

The high voltage AC is generated via a single-phase rectification. This produces a pulsating DC voltage. This method is inexpensive, but has a very high residual ripple. If the device under test has device under test behavior, which is usually the case, a relatively large amount of charging current flows into the Capacitance test object. It is better to use a bridge rectification.

DC – Bridge rectification

The high-voltage AC is rectified via a bridge rectifier. This produces a pulsating DC voltage. Compared to half-wave rectification, this method has a significantly lower residual ripple. If the device under test has device under test behavior, which is usually the case, the capacitor of the device under test acts as an additional filter capacitor (see figure below).

DC – Bridge rectification with filtering

Only the following variant with a high clock frequency (e.g., 15 KHz) and filtering produces low residual ripple with good voltage regulation. Due to the high clock frequency, this design requires only a small filter capacitor and is highly dynamic and very precise when regulating load changes. Unfortunately, this optimal high-voltage source is the most expensive design. Voltage profiles can also be generated ideally with this version.

DC – High-frequency generator with filtering