Bipolar High-Voltage Pulser Circuit for 10 kHz Pulse Repetition
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Solution Overview
Problem
High voltage pulsing power supplies that can produce high voltage bipolar pulses at high pulse repetition frequencies are not available due to technical limitations.
Innovation Solution
A bipolar high voltage pulsing power supply is designed to produce high voltage bipolar pulses with a positive pulse greater than 200 V and a negative pulse less than -200 V, along with a positive to negative dwell period, and can operate at a pulse repetition rate greater than 10 kHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional power supply designs are used, then device complexity is reduced, but pulse repetition frequency cannot exceed low values due to technical limitations
Solution Approach 1:
The power supply circuit is divided into four independent high voltage switch modules (first through fourth switches), each with its own diode. This segmentation allows each switch to operate independently at high frequency while managing voltage polarity alternation, enabling pulse repetition frequencies greater than 10 kHz without excessive overall complexity.
Solution Approach 2:
The circuit employs periodic switching of the four high voltage switches in alternating sequences to generate bipolar pulses. The switches are activated in periodic patterns where the first and third switches produce positive polarity pulses, while the second and fourth switches produce negative polarity pulses, achieving high repetition rates through systematic periodic operation.
2Productivity
If high voltage bipolar pulses at high repetition rates are generated, then productivity is improved, but energy loss increases due to switching frequency
Solution Approach 1:
Diodes are connected in parallel with each high voltage switch to establish preliminary current paths. When switches transition between on and off states, the diodes provide predetermined routes for current flow, preventing voltage spikes and reducing energy loss from parasitic inductance and capacitance during high-frequency switching operations.
Solution Approach 2:
The circuit utilizes parameter changes in the switching elements, specifically employing high voltage switches with optimized capacitance values (less than 10 nF each) and low inductance circuit design (less than 10 nH), to minimize energy loss during rapid switching at pulse repetition rates exceeding 10 kHz.
3Speed
If high voltage pulses with fast rise times are produced, then speed is improved, but manufacturing precision requirements increase
Solution Approach 1:
The circuit achieves fast pulse rise times by selecting high voltage switches with specifically controlled capacitance parameters (less than 10 nF each) and designing the overall circuit with minimal inductance (less than 10 nH). These parameter optimizations enable rapid voltage transitions while maintaining practical manufacturing tolerances for the components.
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 power supply effectively generates high voltage bipolar pulses with a high pulse repetition rate, addressing the technical limitations of existing power supplies.
Implementation Method 1
an energy storage capacitor coupled with the DC source
Implementation Method 2
a first diode arranged across the first high voltage switch; a second diode arranged across the second high voltage switch; a third diode arranged across the third high voltage switch; a fourth diode arranged across the fourth high voltage switch
Data Source
AI summary
A bipolar high voltage bipolar pulsing power supply is disclosed that can produce high voltage bipolar pulses with a positive high voltage pulse greater than about 2 kV followed by a negative high voltage pulse less than about −2 kV with a positive to negative dwell period between the positive high voltage pulse and the negative high voltage pulse. A high voltage bipolar pulsing power supply, for example, can reproduce high voltage pulses with a pulse repetition rate greater than about 10 kHz.