Pulse Voltage Device EMI Reduction via Diode Switching
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Solution Overview
Problem
Existing pulse power supply designs radiate significant electromagnetic interference (EMI) due to nonlinear elements, affecting nearby radio-electronic apparatuses and failing to meet electromagnetic compatibility requirements, especially in distributed power systems.
Innovation Solution
Incorporating a second controllable switch and a square pulse duration converter to manage the switching of the booster diode, ensuring it is closed before the controllable gates, thereby eliminating in-rush current and reducing EMI by correlating the diode switching time with the gate closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nonlinear elements (booster diode, controllable gates) are used in the pulse power supply circuit, then voltage boosting and pulse generation functions are achieved, but electromagnetic interference (EMI) and pulse noise radiation increase significantly
Solution Approach 1:
The anode of the booster diode is connected to the negative terminal of the LDCVS in advance, before the controllable gates are activated. This preliminary connection ensures that when the booster diode switches on, no in-rush current flows through it, thereby preventing EMI generation while maintaining the voltage boosting function
Solution Approach 2:
By pre-connecting the anode of the booster diode to the negative terminal of the LDCVS, the circuit creates a condition that prevents harmful in-rush current from occurring when the diode switches on. This anti-action eliminates the root cause of EMI before it can manifest
2Device complexity
If the booster diode switching time is not synchronized with gate closure, then circuit operation is simpler, but in-rush current flows through the diode causing pulse noise
Solution Approach 1:
The circuit is configured so that the anode connection is established in advance before diode switching. This preliminary arrangement automatically prevents in-rush current without requiring complex timing control circuits, maintaining simplicity while eliminating pulse noise
Solution Approach 2:
The negative terminal of the LDCVS serves as an intermediary connection point for the anode of the booster diode. This intermediary connection provides a safe reference potential that prevents in-rush current during diode switching transitions
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 significantly decreases pulse noise radiation into the environment, enhancing electromagnetic compatibility and improving the operational reliability of electronic units.
Implementation Method 1
an inductive load (made as a primary winding of a transformer, a secondary winding thereof being connected to a rectifier)
Implementation Method 2
a second (booster) capacitor connected by one (a first) plate thereof to a cathode of the first diode
Data Source
Figure 1
Figure 2~2g
AI summary
A device for generating a high pulse voltage comprises a high DC voltage source (1), an inductive load (9), two controllable gates (7) and (12), a controllable switch (41) and, connected in series, a capacitor (31), a diode (30) and an additional controllable switch (47), as well as a controllable pulse duration converter (52) for pulses from a rectangular pulse generator (21). This results in a reduction in the level of interference emitted into the surroundings.