The dc HV power supplies are built around a modular HV converter. All converter modules M1 −MN are fed from a common input rectifier (IR). The modules comprise inverters INV1−INV N feeding HV transformers T1 −TN that feed voltage multipliers R1 −R N having M multiplication stages, which voltages are summed by their dc outputs. Such topology may be referred to as “inductive adder.” For the 100-kV 100-kW rating, N =4, and M =3. Each module is built for 25-kV 25-kW average power and has high-potential insulation of the secondary winding of the transformer rated at 3·25 kV DC =75kVDC.
The number of such transients is determined by the dc HV power supplies operating scenario. For instance, in electrostatic precipitation applications, the number of pulses during the lifetime is determined by the sparking rate. If the latter is 6 sparks/min, the number of shots may well exceed 107.The topology Figure 1 was suggested and partially investigated long ago. It allows reduction of both the voltage rating and the number of multiplier stages of the HV trans-former.
The first improves the compression ratio which is the ratio of the voltage across the first multiplier stage to that of the last and reduces drastically the stored energy. With M =3, the transformers and multiplier boards are rated at 8.5 kV, which simplifies their design and greatly reduces the insulation stress caused by the HF voltage component. The phase shift of the inverters’ output voltages results in the decrease of the output ripple and in the additional reduction of the stored energy . In this approach, the development time and costs are driven down, noting that, once a single module has been developed which includes its main insulation, the whole converter is realized by a simple combination of the desired number of modules that may be connected both in parallel and in series.
The penalty is larger part count and the necessity of the high-potential main insulation that is not required in conventional Cockcroft-Walton multipliers. Nevertheless, this insulation is stressed mainly by a dc voltage and therefore ages much slower compared to an HF stress. Under pulsed operation, the main insulation is also subjected to pulse voltages.
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