Resonant Transformer Power Supply for Changing Capacitive Loads
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Solution Overview
Problem
Conventional power supplies for capacitive loads, such as ozone generators, face challenges in responding to changes in capacitance while maintaining constant inductance, leading to increased costs due to the need for fixed output frequencies and reduced versatility.
Innovation Solution
A power supply system that includes a converter, inverter, resonant transformer, detector, and controller, which adjusts output frequency and voltage within predetermined ranges to maintain target power levels, allowing for automatic frequency and voltage specification to match changing capacitive load specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inductance L of the resonant transformer is kept constant to simplify the power supply structure, then the device complexity is reduced, but the power supply cannot respond to changes in capacitance C of the capacitive load, reducing adaptability
Solution Approach 1:
The patent applies dynamics by making the output frequency of the power supply adjustable and controllable. The frequency specification unit sets different output frequencies based on detected capacitance values, allowing the power supply to dynamically adapt to changing load conditions while keeping the inductance L constant. This resolves the contradiction by introducing temporal variability rather than spatial or structural complexity.
Solution Approach 2:
The patent changes the operating parameter (output frequency) of the power supply in response to detected capacitance changes. By adjusting the frequency according to the capacitance value, the system maintains optimal performance across different load conditions without requiring structural modifications or changing the inductance L, thus resolving the adaptability-complexity contradiction.
2Adaptability or versatility
If the output frequency is adjusted to match resonant frequency when capacitance changes, then the power supply responds to capacitance changes, but the switching loss of the inverter and iron loss of the resonant transformer increase in proportion to output frequency
Solution Approach 1:
The patent implements feedback by detecting the actual output frequency and capacitance value, then using this information to determine the appropriate output frequency setting. The frequency specification unit receives feedback from the detection unit and adjusts the frequency accordingly, creating a closed-loop control system that balances adaptability with energy efficiency by avoiding excessive frequency increases.
Solution Approach 2:
The patent replaces direct mechanical/resonant coupling adjustments with electronic frequency control. Instead of physically adjusting the resonant transformer or inductance to match capacitance changes, the system uses electronic frequency specification and control, substituting mechanical resonance tuning with programmable frequency adjustment, thereby reducing energy losses associated with mechanical adjustments.
3Reliability
If a power supply with fixed output frequency is designed for each capacitance specification, then the power supply can precisely match the load requirements, but the manufacturing cost and device complexity increase
Solution Approach 1:
The patent applies universality by designing a single power supply model that can handle multiple capacitance specifications through programmable frequency control. The frequency specification unit stores multiple frequency values corresponding to different capacitance ranges, allowing one power supply to perform the functions of multiple fixed-frequency models, thereby reducing manufacturing complexity and cost while maintaining reliable matching.
Solution Approach 2:
The patent introduces dynamics by making the output frequency adjustable based on the detected capacitance value. Instead of requiring separate fixed-frequency power supplies for different applications, the system dynamically selects and switches between predefined frequency values, enabling one versatile power supply to replace multiple specialized models and resolve the contradiction between reliability and complexity.
4Power
If the output power is increased to compensate for loss changes, then the power supply maintains performance, but the conduction loss of the inverter and copper loss of the resonant transformer increase in proportion to the square of the current
Solution Approach 1:
The patent changes the operating parameter from fixed frequency to variable frequency based on capacitance detection. By optimizing the output frequency for each capacitance value rather than using a fixed high power setting, the system achieves better impedance matching and reduces current requirements, thereby decreasing conduction and copper losses while maintaining adequate output power performance.
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 solution enhances the versatility of power supplies for capacitive loads by enabling them to adapt to varying capacitance while maintaining efficiency and reducing operational losses, thereby improving power supply performance and reducing costs.
Implementation Method 1
a converter configured to convert alternating current from an alternating-current power source into direct current
Implementation Method 2
an inverter configured to convert the direct current from the converter into alternating current
Implementation Method 3
a resonant transformer configured to boost the alternating current from the inverter, and output the boosted alternating current to the capacitive load
Implementation Method 4
The resonant transformer has its primary side connected to the inverter and its secondary side connected to the ozone generator, boosts the alternating current from the inverter and outputs it
Data Source
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AI summary
A power supply that supplies power to a capacitive load comprises: a converter; an inverter; a resonant transformer; a detector configured to detect output frequency or output current and output voltage; and a controller configured to control the inverter, wherein the controller is configured to: calculate output power; adjust the output frequency within a predetermined frequency search range, adjust the output voltage within a predetermined voltage search range, and specify, as a frequency target value, a minimum value of the output frequency with which the output power reaches predetermined output power; and control the inverter so that the output frequency will be the frequency target value, adjust the output voltage within the predetermined voltage search range, and specify, as a voltage target value, a value of the output voltage with which the output power is target output power.