External Power Transistor Driver With Adaptive Ringing Suppression
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Solution Overview
Problem
Existing driver circuits for external power transistors suffer from ringing artifacts due to parasitic inductors and capacitors, requiring additional external components and measurement pins for explicit measurement, which complicates the process.
Innovation Solution
A driver circuit with an integrated oscillation detection unit and resistance control unit that adjusts output resistance to detect and compensate for oscillations directly within the driver circuit, eliminating the need for external components and additional measurement pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit measurement of ringing is implemented using external resistor and additional measurement pin, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the oscillation detection function with the existing driver circuit by utilizing the gate voltage measurement capability already present in the driver circuit. The oscillation detection unit is integrated within the driver circuit structure, combining multiple functions (driving and detection) into a single unified circuit, thereby eliminating the need for external measurement components and reducing overall device complexity while maintaining measurement precision
Solution Approach 2:
The driver circuit is designed to perform multiple functions: it serves as both the drive signal generator and the oscillation detection unit. The gate voltage measurement pin, originally intended for general gate control, is also utilized for detecting oscillations, making the circuit universal and multi-functional, which reduces the need for dedicated separate measurement components
2Productivity
If fast switching of external transistor is implemented, then productivity is improved, but object-generated harmful factors increase
Solution Approach 1:
The patent implements a feedback mechanism where the oscillation detection unit continuously monitors the gate voltage for oscillations generated during fast switching. When oscillations are detected, the system adjusts the drive signal parameters (such as switching speed or damping) to suppress the ringing artifacts, thereby maintaining fast switching performance while eliminating the harmful oscillations through real-time feedback control
Solution Approach 2:
The driver circuit is designed with preliminary anti-action by incorporating damping elements or adjusting drive signal characteristics before switching occurs. The oscillation detection unit predicts potential ringing conditions and pre-adjusts the drive signal to prevent harmful oscillations from occurring in the first place, rather than reacting after they occur
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
Effectively reduces oscillations in the drain source current of the external power transistor, maintaining them below a predetermined threshold without additional external components, thus simplifying the measurement and reducing power losses.
Implementation Method 1
the parasitic capacitances and inductances in the external power transistor and the circuitry in the neighborhood of the external power transistor may cause ringing artifacts on the source current of the external transistor
Implementation Method 2
the current through the external transistor may start to oscillate due to parasitic inductors and capacitors of the external transistor
Implementation Method 3
The output resistance of the driver circuit may be adjustable. Furthermore, the driver circuit may comprise an oscillation detection unit configured to detect a degree of oscillation on (or of) the drive signal. In addition, the driver circuit may comprise a resistance control unit configured to adjust the output resistance of the driver circuit based on the degree of oscillation on the drive signal
Data Source
AI summary
A method and system avoid ringing at an external power transistor subsequent to switching OFF the external power transistor. A driver circuit generates a drive signal for switching the external power transistor between OFF-state and ON-state. The driver circuit comprises a drive signal generation unit configured to generate a high drive signal triggering the external power transistor to switch to ON-state, wherein an output resistance of the driver circuit is adjustable, an oscillation detection unit to detect a degree of oscillation on the drive signal, and a resistance control unit to adjust the output resistance of the driver circuit based on the degree of oscillation on the drive signal.