Pulse Power Supply Circuit With Ringing Energy Damping
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Solution Overview
Problem
Conventional four-switch circuits face challenges in achieving high-frequency pulse power supply due to ringing periods overlapping with subsequent pulse waves, leading to waveform collapse and difficulty in generating desired plasma discharge, especially in dielectric barrier discharge devices and induction heating devices.
Innovation Solution
A pulse power supply device with a transformer, pulse wave generation circuit, electric vibration consumption circuit, and control mechanisms to quickly attenuate ringing by consuming electric vibration energy, allowing for higher frequency operation without waveform collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pulse frequency is increased to improve output power, then productivity is improved, but waveform collapse occurs due to ringing period overlap
Solution Approach 1:
The patent extracts the harmful ringing component from the pulse waveform by introducing a dedicated damping circuit. The damping resistor is specifically designed to absorb and dissipate the ringing energy that occurs during pulse transitions, separating the useful pulse signal from the harmful oscillations. This allows high-frequency operation without waveform collapse.
Solution Approach 2:
The damping circuit acts as an intermediary element between the pulse generation circuit and the load. By placing the damping resistor in parallel with the load or in specific circuit positions, it mediates the energy transfer during switching transitions, absorbing excess energy and preventing it from causing waveform distortion while allowing the main pulse signal to pass through effectively.
2Ease of operation
If a four-switch circuit is used to generate pulse waves, then ease of operation is improved, but device complexity increases due to multiple switching elements
Solution Approach 1:
The patent makes the damping resistor a universal component that serves multiple functions: it damps ringing during both positive and negative pulse transitions, works with different switching element configurations (MOSFETs, IGBTs, or BJTs), and can be positioned in various circuit locations depending on specific application requirements. This multi-functionality reduces the need for additional specialized components.
3Reliability
If damping circuit is added to reduce ringing, then waveform stability is improved, but device complexity increases
Solution Approach 1:
The patent applies damping locally at specific critical points in the circuit where ringing occurs most prominently, such as across the switching elements or in parallel with the load. Rather than adding global complexity throughout the entire system, the damping resistor is strategically placed in localized positions where it can most effectively suppress ringing with minimal impact on the overall circuit architecture.
Solution Approach 2:
The patent optimizes the damping resistor value based on specific circuit parameters such as switching frequency, load characteristics, and switching element on-resistance. By carefully selecting the damping resistor value (typically in the range of switching element on-resistance values), the circuit achieves effective ringing suppression without excessive power loss or unnecessary complexity. The damping circuit parameters are tuned to match the specific application requirements.
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
The solution enables higher frequency pulse power supply with stabilized output, facilitating improved plasma generation and induction heating by shortening ringing periods and preventing waveform collapse.
Implementation Method 1
an electric vibration consumption circuit connected in parallel to the pulse wave generation circuit, the electric vibration consumption circuit including a consumption resistor that consumes the energy of electric vibration generated in the secondary winding and transmitted to the primary winding
Implementation Method 2
a transformer including a primary winding and a secondary winding... the consumption resistor that consumes the energy of electric vibration generated in the secondary winding and transmitted to the primary winding
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A transformer 7 including a primary winding La and a secondary winding Lb, a pulse generation circuit 9 connected to the primary winding La and including at least one switching element SW1, a consumption circuit 13 connected in parallel to the pulse generation circuit 9, the consumption circuit 13 including a resistor R1 that consumes electric vibration energy Er occurring in the secondary winding Lb and transmitted to the primary winding La, and a switching element SW5 connected in series to the resistor R1, a switch controller 21 that switches on/off of the switching element SW1 and the switching element SW5, and a consumption time controller 23 that controls timing at and a period during which the switching element SW5 is switched to an on-state, are provided.