Abstract
This paper presents a voltage multiplier topology that is a hybrid between a Cockcroft–Walton multiplier and a Dickson charge pump. The Cockcroft–Walton structure exhibits significant output voltage drop under load as the number of multiplier stage increases. This is because all coupling capacitors are connected in series. Dickson charge pump mitigates this issue by connecting all capacitors in parallel. But this solution comes at the expense of large capacitor voltage stress at the last multiplier stage. The proposed hybrid structure arranges some capacitors in parallel and others in series, thereby achieving low output voltage drop and low capacitor voltage stress at the same time. We develop a model that predicts hybrid multiplier's performance and validates it experimentally. We also demonstrate a 60–2.25 kV dc–dc converter based on a 16-stage hybrid voltage multiplier which achieves a voltage gain of 12.8 while keeping the highest capacitor voltage stress to 660 V.
Highlights
H IGH-VOLTAGE power supplies are crucial in many medical and industrial applications
This paper presents a new voltage multiplier topology that is suitable for high-voltage dc generation
This paper presented a voltage multiplier topology that is a hybrid of Cockcroft–Walton and Dickson topologies
Summary
H IGH-VOLTAGE power supplies are crucial in many medical and industrial applications. The output voltage of a Cockcroft–Walton multiplier quickly ‘sags’, i.e., deviates from the ideal value, as the number of stages increase [11] This is because the output impedance adds up rapidly as more coupling capacitors are connected in series. If the output voltage needs to be higher than the coupling capacitors’ voltage rating, one may consider stacking multiplier stages in Dickson structure until the output voltage reaches the capacitor voltage limit, switch to Cockcroft–Walton structure and continue stacking additional stages. This idea is the inspiration of our study.
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