High Voltage Power Supply Module Operating in Magnetic Field

1
High Voltage Power Supply ModuleOperating in
Magnetic Field

• Output Voltage 2500V 4000V
• Load Resistance 10 MW
• Magnetic Field 1.5 tesla
• Efficiency 60
• Input Voltage 5 V

2
(No Transcript)
3
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.

4
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 mA 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

5
Third Order Longitudinal Mode Piezoelectric
Ceramic Transformer

• High Amplitude Ratio ( Turn Ratio 40)
• Low Internal Resistance ( 0.25 W)

6
Equivalent Circuit of Piezoelectric Transformer
And its Parameters
7
Amplitude Ratio as Function of Frequency and
Load Resistance
8
Resonance Shown by Transformer Loaded with 100 kW
9
High Voltage Power Supply ModuleKept 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

10
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

11
(No Transcript)
12
Output high voltage is stabilized by utilizing
the frequency dependence of amplitude ratio
13
(No Transcript)
14
Amplitude and Phase of Transmission Path From
Output of Error Amplifier to Output of CW Circuit
With Load of 6 MW
15
Protection Utilizes Breakdown of Feedback
16
Setup for Measurement
17
Output voltage versus driving frequency for load
of 20 MW with supply voltages from1 V to 3.5 V
by stepped at 0.5 V.
18
Output voltage is plotted against driving
frequency for a load of 10 MW and various supply
voltage.
19
Output voltage versus driving frequency for a
load of 4.7 MW with various supply voltages
20
Amplitude Ratio of Ceramic Transformer

• When load is 20 MW, an equivalent resistance of
  the load viewed from the input of the CW circuit
  is about 200 kW. 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.

21
LonWorks Node for Module
22
Output H.V. vs. VCO Frequency for Several Supply
Voltages
Efficiency. vs. VCO Frequency for Several Supply
Voltages
23
Efficiency vs.Output H.V. for Several Supply
Voltages
24

• 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