Power Supply Device Using Frequency-Selective Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power supply devices for traveling-wave tubes are large and costly due to the need for multiple high-voltage transformers and large bleeder resistances, which hinder miniaturization and cost reduction in high-frequency circuit systems.
Innovation Solution
A power supply device utilizing a transformer with a primary source supplying alternating voltage at multiple frequencies, coupled with a filter circuit on the secondary side that controls voltage passage and interruption based on frequency, eliminating the need for a dedicated high-voltage transformer for the heater and reducing the size and cost of the power supply device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple high-voltage transformers are used to supply power to different electrodes, then the power supply can be provided to all electrodes, but the device size and cost increase
Solution Approach 1:
A single high-voltage transformer is designed to perform multiple functions by providing power to different electrodes through frequency-selective filtering. The transformer supplies both heater voltage (through filter circuit 60) and collector/helix voltage (through filter circuit 80) using the same transformer core, eliminating the need for separate transformers and reducing overall device size.
Solution Approach 2:
The power supply function is segmented by frequency rather than by separate physical transformers. The secondary winding outputs are divided into different frequency bands using filter circuits, allowing one transformer to serve multiple electrodes with different voltage requirements through frequency-based separation.
2Reliability
If large bleeder resistances are used to suppress voltage rise, then voltage stability is improved, but the device size and cost increase
Solution Approach 1:
The mechanical/electrical system of large bleeder resistances is replaced with an electronic control system based on frequency modulation. Instead of using passive resistive elements to suppress voltage rise, the invention uses active frequency control of the alternating voltage supplied to the primary winding, combined with frequency-selective filter circuits, to achieve voltage stabilization without large resistances.
Solution Approach 2:
The invention changes the parameter being controlled from resistance value to frequency. By modulating the frequency of the alternating voltage supplied to the primary winding and using frequency-selective filters on the secondary side, the system achieves voltage stability through parameter change rather than through fixed resistive elements.
3Ease of operation
If a dedicated high-voltage transformer is used for the heater, then the heater can be preheated before main power is applied, but the device complexity and cost increase
Solution Approach 1:
The single high-voltage transformer is designed with multiple secondary windings that can output different frequencies. By controlling which frequency band is passed through the appropriate filter circuit, the same transformer provides both heater power (at one frequency) and main electrode power (at another frequency), enabling preheating control without requiring a dedicated transformer.
Solution Approach 2:
The invention uses periodic frequency switching of the alternating voltage supplied to the primary winding. During the preheating phase, the voltage frequency is set to pass through the heater filter circuit. After preheating is complete, the frequency is changed to pass through the collector/helix filter circuit, achieving sequential power delivery through periodic frequency modulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for a smaller, more cost-effective power supply device by stabilizing output voltage without bleeder resistances and narrowing the operating range of regulator circuits, enabling further miniaturization and cost reduction in high-frequency circuit systems.
Implementation Method 1
a transformer (20, 120)
Implementation Method 2
a filter circuit (60, 80, 170, 180) connected to a secondary winding of the transformer and having an attenuation that varies according to the frequency of the alternating voltage
Data Source
AI summary
The present invention includes: a transformer; a primary source for supplying an alternating voltage of at least two frequencies to a primary winding of the transformer; and a filter circuit connected to a secondary winding of the transformer and having an attenuation that varies according to the frequency of the alternating voltage, where the frequency of the alternating voltage supplied to the primary winding of the transformer is controlled so that a desired alternating voltage is outputted from the filter circuit connected to the secondary winding of the transformer.