Capacitor Multiplier Compensation for Closed-Loop Switching Noise
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Solution Overview
Problem
High-voltage and high-current gate driver applications face challenges with noise-sensitive converters experiencing performance degradation due to unwanted inductive noise and ringing, leading to delayed startup times and increased overshoot, which affect the switching characteristics of power SiC MOSFETs and surrounding components.
Innovation Solution
The implementation of a converter with a small compensation capacitor (10 picofarads) coupled with a capacitor multiplier to achieve the electrical effect of a large compensation capacitor (200 picofarads), allowing for adjustable capacitance through current mirrors to improve switching conditions, while maintaining a fast startup time and reducing overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large compensation capacitor is used to reduce noise and ringing, then noise rejection is improved, but startup time increases and switching speed decreases
Solution Approach 1:
The patent applies dynamics by making the capacitance value adjustable rather than fixed. The capacitor multiplier circuit allows the effective capacitance to be dynamically changed based on operating conditions, enabling fast startup with low capacitance and noise filtering with high capacitance at different times
Solution Approach 2:
The patent changes the capacitance parameter dynamically using a capacitor multiplier circuit. The effective capacitance value is adjusted based on the ratio of compensation current to reference current, allowing the system to optimize between fast startup (low capacitance) and noise rejection (high capacitance) by changing this parameter
2Stability of the object's composition
If a large compensation capacitor is used to improve noise rejection, then stability is improved, but switching characteristics deteriorate due to increased overshoot and delayed response
Solution Approach 1:
The system dynamically adjusts the capacitance value to maintain stability while preserving switching performance. During transient conditions, low effective capacitance allows fast response, while during steady-state operation, high effective capacitance provides noise rejection and stability
Solution Approach 2:
The effective capacitance parameter is changed based on operating mode. The capacitor multiplier circuit adjusts the capacitance ratio to match the operational requirements, enabling the system to achieve both stability and fast switching characteristics under different conditions
3Loss of time
If a small compensation capacitor is used to achieve fast startup time, then startup speed is improved, but noise rejection capability deteriorates
Solution Approach 1:
The system employs periodic or conditional adjustment of capacitance through the capacitor multiplier. Different capacitance values are applied at different operational phases - low capacitance during startup and high capacitance during normal operation - to optimize performance for each phase
Solution Approach 2:
The capacitance parameter is adjusted based on operational phase. During startup, the capacitor multiplier provides low effective capacitance for fast response, then transitions to high effective capacitance for noise rejection during steady-state operation
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 solution ensures proper operation of noise-sensitive converters by effectively rejecting noise and ringing, achieving fast startup times (less than 60 microseconds) and reducing overshoot, thereby enhancing the switching characteristics of high-power gate drivers.
Implementation Method 1
a converter with a small compensation capacitor (10 picofarads) coupled with a capacitor multiplier to achieve the electrical effect of a large compensation capacitor (200 picofarads)
Implementation Method 2
adjustable capacitance through current mirrors
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture are disclosed to improve switching conditions in a closed loop system. An example device includes a first switch adapted to be coupled to a first node, a second switch adapted to be coupled to a second node, a capacitor including a first terminal and a second terminal, wherein the first terminal is coupled the first switch, and wherein the second terminal is coupled to the second switch, a first multiplier coupled to the first terminal and to the second terminal, wherein the first multiplier is adapted to be coupled to at least a third node and a fourth node, and a second multiplier coupled to the first terminal and to the second terminal.