This document describes a transformer originally intended for LCD display backlight service. The transformer provides a high voltage, low current stable output, and has low noise characteristics.
This document details the design of high voltage, low noise DC/DC converters suitable for applications like photomultipliers and radiation detectors. It focuses on achieving output noise levels well under a millivolt using resonant Royer topologies that minimize high-frequency harmonic content.
The note presents several circuit variations, including current-fed resonant Royer converters utilizing standard magnetics. It compares linear control methods with switched mode approaches, demonstrating how controlled transition times in switching regulators can maintain efficiency while significantly reducing output noise compared to standard switching techniques.
| Output Voltage Range | 200V to 1000V |
|---|---|
| Output Noise Level | below 100uV (100 microvolts) |
| Bandwidth for Noise Measurement | 100MHz |
| Maximum Load Current | rarely exceed 5mA |
Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, and radiation detectors.
Yes, all examples utilize standard, commercially available magnetics with no custom components required.
It is well suited to low noise operation due to its sinusoidal power delivery and minimizes high frequency harmonic content.