A Hybrid Cockcroft–Walton/Dickson Multiplier for High Voltage Generation

By S. Park, J. Yang and J. Rivas-Davila in Journal IEEE TPELS

July 22, 2019

Experimental setup for the 60 V–2.25 kV dc–dc converter test. (a) Schematic. (b) Photograph.

Figure 1: Experimental setup for the 60 V–2.25 kV dc–dc converter test. (a) Schematic. (b) Photograph.


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.

Posted on:
July 22, 2019
1 minute read, 166 words
Charge Pumps Passive Circuits Rectifiers Switched Capacitor Circuits Sanghyeon Park
See Also:
Apparatuses and methods involving power conversion using multiple rectifier circuits
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Optimized Design of Multi-MHz Frequency Isolated Auxiliary Power Supply for Gate Drivers in Medium-Voltage Converters