Gate Driver Dead Time Control With External Resistor Setting
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Solution Overview
Problem
Existing gate driver circuits face inefficiencies due to non-zero dead time settings that cannot be accurately controlled, leading to reduced switching circuit performance.
Innovation Solution
A gate driver circuit design that allows external control of dead time through a setting pin connected to an external resistor, enabling bypassing of internal delay circuits to achieve zero dead time, and includes selectors and analog delay circuits to manage transistor states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed internal dead time circuit is used to prevent through current, then switching safety is improved, but switching efficiency deteriorates due to unavoidable time delays
Solution Approach 1:
The patent implements dynamic dead time control by allowing the dead time period to be adjusted based on switching conditions. The control circuit can extend or reduce the dead time dynamically - extending it when through current risk is detected, and reducing or eliminating it when safe switching conditions exist, thereby optimizing both safety and efficiency
Solution Approach 2:
The patent changes the parameter of dead time from a fixed value to a variable parameter that can be modified based on circuit conditions. The control circuit monitors switching states and adjusts the dead time duration accordingly, enabling the system to adapt between safety-oriented and efficiency-oriented operating modes
2Reliability
If dead time is extended to ensure safe switching transitions, then through current prevention is improved, but switching frequency capability deteriorates
Solution Approach 1:
The control circuit dynamically adjusts dead time duration based on real-time switching conditions. When safe switching conditions are detected, the dead time is minimized or eliminated, enabling higher switching frequencies. When conditions require safety margins, dead time is extended appropriately
3Adaptability or versatility
If a setting pin with external resistor is used to control dead time, then dead time adjustability is improved, but circuit complexity deteriorates
Solution Approach 1:
The patent introduces a setting pin with external resistor as an intermediary control interface. This simple external component interacts with the internal control circuit to adjust dead time parameters, providing user-friendly adaptability without requiring complex internal circuitry or programming interfaces
Data Source
AI summary
The present disclosure provides a gate driver circuit. An external resistor is connected to a setting pin. A high-side dead time circuit is configured to receive a first high-side control signal and generate a second high-side control signal. An analog delay circuit is configured to delay the first high-side control signal by a delay time corresponding to a resistance value of the external resistor to generate a delayed high-side control signal. A selector is configured to receive the first high-side control signal and the delayed high-side control signal, select one according to an electrical state of the setting pin, and output the selected signal as the second high-side control signal.