High-Power Switching Module with Adjustable Offset Timing
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Solution Overview
Problem
High-power switching modules face challenges in achieving high switching synchronism below 1.5 ns over a wide range of voltages and temperatures, leading to inefficiencies and potential destruction of semiconductor switches due to varying turn-on and turn-off time constants and element tolerances.
Innovation Solution
A high-power switching module with series-connected switching stages, each equipped with a semiconductor switch, snubber capacitor, synchronizing resistor, and a control network that includes a control resistor, control diode, auxiliary diode, auxiliary capacitor, and an adjustable time-delay element to set an offset voltage for each switching stage, ensuring synchronized turn-on and turn-off operations within a narrow time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If series-connected switching stages with semiconductor switches are used to achieve high voltage switching, then the switching voltage capability is improved, but the switching synchronism deteriorates due to varying turn-on and turn-off time constants
Solution Approach 1:
The patent applies preliminary action by pre-charging auxiliary capacitors with offset voltages before the main switching event. Each switching stage receives a predetermined offset voltage through its auxiliary capacitor, which compensates for individual variations in turn-on and turn-off time constants. This pre-prepared voltage compensation ensures that all switching stages synchronize their switching operations within the required 1.5 ns window, resolving the synchronism issue while maintaining high voltage capability
Solution Approach 2:
The patent changes the voltage parameter by introducing adjustable offset voltages to each switching stage through auxiliary capacitors. By varying the offset voltage magnitude for each individual switching stage, the system compensates for manufacturing tolerances and individual device characteristics. This parameter adjustment allows precise control over switching timing, achieving the required synchronism while preserving the high voltage switching capability of the series-connected stages
2Stress or pressure
If a high number of semiconductor switches are connected in series to handle high voltages, then the voltage range is improved, but the power loss and complexity increase
Solution Approach 1:
The auxiliary capacitors are pre-charged with offset voltages during the off-state of each switching stage. This preliminary charging action prepares the compensation voltage in advance, eliminating the need for continuous high-power adjustment circuits during switching. The pre-stored energy in the auxiliary capacitors reduces real-time power consumption while maintaining the ability to synchronize switching across all stages
Solution Approach 2:
Each switching stage uses its own auxiliary capacitor and offset voltage to self-compensate for its individual timing characteristics. This self-service approach eliminates the need for complex centralized control circuits that would consume additional power. Each stage independently adjusts its switching timing using its pre-charged auxiliary capacitor, reducing overall system power loss while handling high voltages
3Reliability
If semiconductor switches are used instead of thyratrons, then the service life and reliability are improved, but the switching synchronism control deteriorates due to element tolerances
Solution Approach 1:
The patent changes the electrical parameter by introducing individually adjustable offset voltages to each semiconductor switch through auxiliary capacitors. This compensation mechanism accounts for manufacturing tolerances and individual device variations in turn-on and turn-off time constants. By adjusting the offset voltage parameter for each switch, the system achieves precise synchronism control (within 1.5 ns) while maintaining the reliability and long service life advantages of semiconductor devices
Solution Approach 2:
The auxiliary capacitors are pre-charged with compensating offset voltages before switching operations begin. This preliminary action prepares each switching stage with the specific voltage compensation it needs to overcome individual device tolerances. The pre-established voltage compensation ensures that all semiconductor switches operate synchronously, maintaining reliable control despite manufacturing variations
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 configuration allows for high switching synchronism of less than 1.5 ns, reducing the number of semiconductor switches required and enhancing efficiency, while maintaining reliability and extending the service life of the module.
Implementation Method 1
an auxiliary capacitor (HC) configured to decouple and store the auxiliary power so as to maintain an offset voltage at the semiconductor switch
Implementation Method 2
a control diode (SD) polarized in a conducting direction of the switching pulses
Implementation Method 3
an auxiliary diode (HD) polarized in a non-conducting direction of the switching pulses
Data Source
AI summary
A high-power switching module for directly feeding pulse energy to a load includes a plurality of series-connected switching stages. Each switching stage includes a semiconductor switch; a snubber capacitor and a synchronizing resistor; and a control network configured to act on the semiconductor switch and to be supplied with auxiliary power and switching pulses from a pulse driver so as to influence a switching of the semiconductor switch. The control network includes at least one control resistor, a control diode, an auxiliary diode, an auxiliary capacitor configured to decouple and store the auxiliary power so as to maintain an offset voltage at the semiconductor switch, and an adjustable time-delay element series connected to the control diode and connected in parallel with the control resistor. The adjustable time-delay element is configured to variably set the offset voltage for the semiconductor switch that determines the switching of the semiconductor switch.