Gate Driver Current Dip Injection for Switch-Node Ringing
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Solution Overview
Problem
Ringing at the switch node between high-side and low-side switches in switching converters leads to unwanted electromagnetic interference (EMI), which increases energy loss and reduces efficiency, and existing solutions face a trade-off between EMI reduction and energy loss.
Innovation Solution
Implementing a current dip injection into the gate current of the driver circuit to reduce ringing, which can be achieved through hardware, software, or a combination of both, by injecting a positive or negative current dip depending on the switch state, thereby shortening transition times and reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gate driving is used to maintain high switching rates, then productivity is improved, but electromagnetic interference increases and energy loss increases
Solution Approach 1:
The patent applies preliminary anti-action by injecting a current dip into the gate current before the switch transitions cause harmful ringing and EMI. This preemptive current injection counteracts the parasitic oscillations that would otherwise occur during switch node transitions, reducing EMI while maintaining high switching rates without requiring slower operation
2Productivity
If conventional gate driving is used to maintain high switching rates, then productivity is improved, but energy loss increases
Solution Approach 1:
The current dip injection preemptively reduces parasitic oscillations at the switch node before they can cause energy loss. By suppressing ringing through controlled current injection during the transition phase, the patent minimizes energy dissipation while allowing the system to operate at high switching rates that would otherwise produce excessive losses
3Object-generated harmful factors
If current dip injection is used to reduce ringing and EMI, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the EMI reduction function with the existing gate driver circuit by integrating current dip injection capability into the standard gate driving architecture. This combination allows the same circuit to perform both normal gate driving and harmful oscillation suppression without requiring entirely separate EMI mitigation hardware, thereby limiting the increase in device complexity
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 current dip injection effectively reduces ringing and EMI, improving the efficiency of the switching converter by minimizing energy loss while maintaining high switching rates.
Implementation Method 1
a driver circuit configured to drive a high-side switch and a low-side switch of a switch converter. The semiconductor device can further include a circuit configured to inject a current dip into a gate current outputted by the driver circuit
Data Source
AI summary
Systems and methods for injecting a current into are described. A switch converter can include a high-side switch and a low-side switch. A driver circuit can be configured to drive the high-side switch and the low-side switch in the switch converter. A controller can be configured to provide control signals to control the driver circuit. The driver circuit can further include a circuit configured to inject a current dip into a gate current outputted by the driver circuit to drive at least one of the high-side switch and the low-side switch.