High Voltage Power Supply Module Operating in Magnetic Field Output Voltage 2500V ~ 4000V Load Resistance 10 M  ~ Magnetic Field 1.5 tesla Efficiency 60 % Input Voltage 5 V

Problem About Supply of Transformer A company is reluctant to resume production of third order Rosen-type transformer. The company proposes an alternative transformer compatible with current production line. Samples of the alternative transformer, which is newly developed, arrived last month. The alternative transformer is expected to show better performance.

High Voltage Power Supply Module for Commodity Use High voltage power supply module incorporating the ceramic transformer is produced for commodity use The module provides a fixed high voltage of 4 kV with an output current up to 160  A at an efficiency of 70 %. The inductance being implemented by a air-core coil, the module can be operated in magnetic field. Price is a few dollars

Third Order Longitudinal Mode Piezoelectric Ceramic Transformer High Amplitude Ratio ( Turn Ratio ~ 40) Low Internal Resistance ( 0.25  )

Equivalent Circuit of Piezoelectric Transformer And its Parameters

Amplitude Ratio as Function of Frequency and Load Resistance

Resonance Shown by Transformer Loaded with 100 k 

High Voltage Power Supply Module Kept Under Control of Network Module is interfaced by Neuron chip Function of module under control of Neuron chip is controlled via network Turn on and off module Set of output high voltage Recovery from feedback breakdown Output current monitor

Components of High Voltage Power Supply Module Reference Voltage 0V ~ 4V Error Amplifier Voltage-Controlled Oscillator (VCO) Driver Circuit Piezoelectric Transformer Cockcroft-Walton (CW) Circuit three stages Divider resistor 1 : 1000 Circuit for Network Control

Output high voltage is stabilized by utilizing the frequency dependence of amplitude ratio

Amplitude and Phase of Transmission Path From Output of Error Amplifier to Output of CW Circuit With Load of 6 M 

Protection Utilizes Breakdown of Feedback

Setup for Measurement

Output voltage versus driving frequency for load of 20 M  with supply voltages from 1 V to 3.5 V by stepped at 0.5 V.

Output voltage is plotted against driving frequency for a load of 10 M  and various supply voltage.

Output voltage versus driving frequency for a load of 4.7 M  with various supply voltages

Amplitude Ratio of Ceramic Transformer When load is 20 M , an equivalent resistance of the load viewed from the input of the CW circuit is about 200 k . So the amplitude ratio of the ceramic transformer is expected to be about 120 at the resonance frequency In practice, the amplitude ratio is found to be more than eighty around the resonance frequency.

LonWorks Node for Module

Output H.V. vs. VCO Frequency for Several Supply Voltages Efficiency. vs. VCO Frequency for Several Supply Voltages

Efficiency vs.Output H.V. for Several Supply Voltages

The efficiency does not depend on the supply voltage The efficiency depends mainly on the VCO frequency. Dependence of the efficiency on the VCO frequency is defined by the inductance