Pulse Shaping Circuit for Flat Electrical Pulses With Fast Rise Time
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Solution Overview
Problem
Existing electrical pulse generating modules based on capacitor discharge suffer from voltage droop, leading to non-flat electrical pulses, which can be unacceptable in certain applications such as driving microwave amplifiers.
Innovation Solution
The electrical pulse generating arrangement includes an electrical pulse shape adjustment circuit with a first resistor, an inductor, and a second electrical energy storage module, connected in series with the load, to compensate for voltage droop and maintain a flat pulse shape while minimizing rise time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a parallel R-L circuit is used to compensate for voltage droop, then the electrical pulse shape becomes flat, but the rise time increases
Solution Approach 1:
The circuit performs preliminary charging of the capacitor through the inductor before the pulse is needed. By pre-establishing current in the inductor during the charging phase, the circuit compensates for voltage droop in advance, allowing the pulse to maintain flatness without requiring the resistor to be active during the pulse itself, thus preserving fast rise time
Solution Approach 2:
The circuit dynamically switches between charging and discharging modes. During charging, the inductor stores energy and current builds up gradually. During pulse generation, the pre-stored current in the inductor automatically compensates for capacitor voltage droop without introducing additional rise time, as the compensation is already in place
2Shape
If the resistor in the parallel R-L circuit is active from the beginning of the electrical pulse, then voltage droop is compensated, but the rise time increases
Solution Approach 1:
The compensation action is performed in advance during the charging phase rather than during the pulse phase. The inductor current is built up beforehand, so when the pulse is generated, the compensation is already active without delaying the rise time
Solution Approach 2:
The circuit operates in periodic cycles of charging and discharging. During the charging period, the inductor accumulates current that will be used for compensation during the next discharge pulse, separating the compensation preparation from the pulse generation itself
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 effectively compensates for voltage droop, achieving flat or substantially flat electrical pulses with a relatively fast rise time, suitable for applications requiring precise pulse characteristics.
Implementation Method 1
The inductor in the parallel R-L circuit carries no current at the beginning of the electrical pulse. During the discharge of the capacitor—and hence during the duration of the electrical pulse—current builds up in inductor in the parallel R-L circuit.
Implementation Method 2
An electrical energy storage unit or module such as a capacitor may be used to store electrical energy, which when discharged generates an electrical pulse that can be delivered to the load
Implementation Method 3
the resistor in the parallel R-L circuit is 'active' from the beginning of the electrical pulse, and causes a voltage drop across the parallel R-L circuit. The resistance of the resistor in the parallel R-L circuit is selected in order to obtain a voltage drop across the parallel R-L circuit for compensating for the droop in voltage of the electrical pulse
Data Source
AI summary
An electrical pulse generating arrangement is disclosed, which is connected or connectable to a load. The electrical pulse generating arrangement comprises an electrical pulse generating module, which comprises a first electrical energy storage module and a power supply configured to selectively charge the first electrical energy storage module. The electrical pulse generating module is configured to generate one or more electrical pulses by charging and discharging of the first electrical energy storage module, wherein when the first electrical energy storage module is discharged, an electrical pulse is created to be conveyed to the load. The electrical pulse generating arrangement comprises an electrical pulse shape adjustment circuit connected or connectable in series with the load. The electrical pulse shape adjustment circuit comprises at least a first resistor, an inductor and a second electrical energy storage module.