MOV Pulse Circuit for Flat-Topped High-Power Pulses
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Solution Overview
Problem
Current technologies fail to efficiently produce high-power electrical pulses with rapid rise times and flat-topped voltage profiles, particularly for applications like high-power microwave and charged particle beams, where precise voltage control and short pulse durations are critical.
Innovation Solution
A circuit and method utilizing a metal oxide varistor (MOV) connected between a high-voltage source and ground, with an inductor and switches to manage current flow, allowing for the production of high-power, flat-topped electrical pulses by exceeding the clamping voltage of the MOV and controlling the switch closure times to achieve a smooth, rapid voltage rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pulse forming networks are used to generate high-power electrical pulses, then voltage control and pulse shaping are achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the pulse shaping function from complex conventional networks and implements it using a single metal oxide varistor (MOV) component. The MOV's nonlinear voltage-current characteristics inherently provide the pulse shaping and voltage clamping functions that previously required multiple capacitors, inductors, and switches arranged in complex pulse forming networks, thereby dramatically reducing device complexity while maintaining voltage control precision.
Solution Approach 2:
The metal oxide varistor serves multiple functions simultaneously: it acts as a voltage clamp, pulse shaper, and protective element all in one component. This multi-functionality replaces what previously required separate dedicated components for each function, reducing the overall system complexity while achieving the same voltage control and pulse generation objectives.
2Use of energy by moving object
If pulse duration is extended to deliver sufficient energy, then energy delivery improves, but voltage stability and flat-topped profile become difficult to maintain
Solution Approach 1:
The patent utilizes the voltage-dependent resistance parameter of the metal oxide varistor, which changes dramatically with applied voltage. At normal operating voltages, the MOV presents high resistance to maintain voltage stability. When voltage exceeds the clamping level, the resistance drops sharply to limit voltage and shape the pulse profile. This dynamic parameter change enables simultaneous energy delivery and voltage stability maintenance throughout the extended pulse duration.
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 the generation of high-power electrical pulses with a flat-topped voltage profile and rapid rise time, reducing the complexity of conventional pulse forming networks and providing a cost-effective method for producing smooth-topped pulses with precise voltage control.
Implementation Method 1
when a voltage spike occurs at a voltage which is greater than the breakdown voltage of spaces around the zinc-oxide granules, current then easily flows around the zinc-oxide granules and the MOV thus acts as a short from Vs to ground
Implementation Method 2
Under typical operating conditions, only a very small amount of current flows from one conductive plate, through the zinc-oxide, and to the other conductive plate. This is because of the relatively high resistance of the zinc-oxide
Data Source
AI summary
A circuit and method for creating a high-power electrical pulse which has a smooth or flat-topped configuration as well as a very short rise time. A metal oxide varistor (MOV) is preferably placed in parallel with a load and a switch is preferably placed in series between the MOV and the load.