Inductive Load High Pulse Voltage Generation EMI Reduction
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Solution Overview
Problem
Existing designs for generating high pulse voltage in inductive loads fail to minimize short-term pulse electromagnetic noise radiated into the environment.
Innovation Solution
The method involves generating high DC and low DC voltages, creating sequences of controlling square pulses, and applying these pulses to controlled gates to periodically connect and disconnect an inductive load, while transforming the pulses to delay their trailing edges and applying them to a second controlled switch, thereby reducing electromagnetic noise by ensuring the diode is fully off before the pulse ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high pulse voltage is generated in an inductive load by periodic connecting and disconnecting, then high voltage output is achieved, but short-term pulse electromagnetic noise is radiated into the environment
Solution Approach 1:
The patent applies preliminary action by transforming the control pulses beforehand to create a time gap. The trailing edges of the third sequence of controlling pulses are delayed relative to the first sequence, ensuring the diode is fully off before the next pulse begins. This pre-planned timing adjustment prevents electromagnetic noise at the trailing edges without compromising the high voltage output function.
2Duration of action of moving object
If controlling pulses are applied to periodically connect and disconnect the inductive load, then high pulse voltage is obtained, but noise surges occur at the trailing edges of pulses
Solution Approach 1:
The patent changes the timing parameter of the control pulses by transforming the first sequence into a third sequence with delayed trailing edges. This parameter modification creates a time gap that allows the diode to fully turn off before the next pulse, eliminating noise surges while preserving the required pulse duration for high voltage generation.
3Power
If the diode is not fully off before the pulse ends, then continuous voltage output is maintained, but electromagnetic interference is radiated to the environment
Solution Approach 1:
The transformed control pulse sequence acts as an intermediary mechanism that mediates between continuous voltage output and electromagnetic interference prevention. By introducing a controlled time gap through pulse transformation, the system ensures the diode is fully off during this interval, preventing EMI while maintaining overall voltage output continuity through the periodic pulse train.
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 prevents short-term pulse electromagnetic noise during high pulse voltage generation in inductive loads, enhancing electromagnetic compatibility by ensuring the diode is fully off, thus eliminating noise surges.
Implementation Method 1
periodically connecting an inductive load to outputs of a high DC voltage source by the first controlled gate to thus obtain high pulse voltage in the inductive load
Implementation Method 2
transforming the first sequence of controlling pulses having a preset duration of pulses into a third sequence of controlling pulses, trailing edges of the pulses of the third sequence leading trailing edges of the pulses of the first sequence by a preset value
Data Source
Figure 1
Figure 2-1
Figure 2-2
AI summary
A method for generating a high pulse voltage in an inductive load consists in periodically connecting an inductive load to the outputs of a source of high constant voltage using a first controllable switching device, periodically disconnecting and connecting a control circuit of a second controllable switching device using a first controllable switch, and also periodically supplying low voltage from an output of a source of low constant voltage to the control circuit of the second controllable switching device via a second controllable switch, thus eliminating conditions conducive to transient pulsed electromagnetic interference during the generation of a high pulse voltage in an inductive load.