DC Pulse Power Supply With Voltage Superimposition for Higher Output
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Solution Overview
Problem
The existing DC pulse power supply devices struggle to achieve high output voltage in step-up chopper circuits, particularly in plasma generation applications, due to limitations in the active-clamp circuit configuration, where the charge voltage from the capacitor does not contribute significantly to boosting the output voltage.
Innovation Solution
The DC pulse power supply device incorporates a voltage superimposing unit that adds a regeneration voltage or reactor voltage to the pulse output in the step-up chopper circuit, enhancing the output voltage by clamping and regenerating excess voltage, thereby increasing the duty ratio and amplitude of the pulse output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the duty ratio is increased to boost output voltage, then the output voltage increases, but the OFF period time width decreases which limits voltage boosting capability
Solution Approach 1:
The invention applies preliminary action by accumulating energy in the reactor during the ON period before the switching element turns OFF. The energy accumulation during the ON period prepares the system to generate higher voltage during the subsequent OFF period, effectively resolving the contradiction between duty ratio and voltage boosting capability.
Solution Approach 2:
The invention utilizes periodic action through the repetitive ON/OFF cycling of the switching element. Each cycle accumulates energy in the reactor during the ON period and releases it as boosted voltage during the OFF period, creating a periodic pulse output that achieves high voltage through repeated energy accumulation and release cycles.
2Reliability
If the active-clamp circuit is used to control switching element voltage, then switching element protection is achieved, but the charge voltage from capacitor does not significantly contribute to output voltage boosting
Solution Approach 1:
The invention segments the voltage boosting function into two independent parts: the step-up chopper circuit (with switching element Q1 and reactor L1) for primary voltage boosting, and the voltage superimposing circuit (with switching element Q2 and capacitor C2) for additional voltage superimposition. This segmentation allows each circuit to optimize its function without interfering with the other, enabling both switching element protection and enhanced output voltage boosting.
Solution Approach 2:
The invention merges the output of the step-up chopper circuit with the voltage from the capacitor C2 through the voltage superimposing circuit. The voltages are combined at the output to achieve enhanced boosting effect, while the active-clamp circuit continues to provide switching element protection independently. This merging allows both functions to work together synergistically.
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 approach effectively boosts the output voltage of the pulse output in the step-up chopper circuit, improving the ignitability of plasma generated between electrodes, by superimposing regeneration and reactor voltages, which are managed through regeneration and reactor voltage units, respectively.
Implementation Method 1
energy is accumulated in a DC reactor of the inductor 121 depending on a time width of the ON period, thereby forming a pulse output with amplitude boosted according to the accumulated energy
Implementation Method 2
the reactor of the step-up chopper circuit is composed of two reactors magnetically coupled to each other, namely a first reactor L1-1 and a second reactor L1-2, so that the capacitor C2 of the active-clamp circuit is discharged due to energy accumulated in the second reactor L1-2
Data Source
AI summary
This DC-pulse power supply device is provided with: a DC power supply; a pulse unit (20) for generating a pulse output using a step-up chopper circuit connected to the DC power supply; and a voltage superimposing unit (30A, 30B) connected to a DC reactor of the step-up chopper circuit. The voltage superimposing unit (30A, 30B) superimposes an amount (Vc, VDCL2) corresponding to a superimposed voltage on the output voltage of the step-up chopper circuit. The pulse unit (20) outputs, in a pulse form, the output voltage (Vo) on which the amount (Vc, VDCL2) corresponding to the superimposed voltage is superimposed by the voltage superimposing unit (30A, 30B). The amount corresponding to the superimposed voltage is superimposed on the pulse output of the step-up chopper circuit, thereby raising the output voltage of the pulse output of the step-up chopper circuit.