Integrated Gate Driver Circuit for Solid-State Switch Turn-Off Protection
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Solution Overview
Problem
Existing gate driver circuits for solid-state switches are power-hungry and bulky, making them unsuitable for integration with solid-state switches, especially when dealing with high energy absorption during turn-off under shorted or overload conditions due to significant inductance in the power source.
Innovation Solution
A compact gate driver and protection circuit is developed, featuring an isolated bias power circuit, a current buffer circuit with low output resistance, and a snubber circuit, along with a signal processing and diagnostic controller to manage the solid-state switch's operation efficiently, consuming less than one watt and integrating closely with the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing gate driver circuits are used for solid-state switches, then the switch can be controlled to transition between on-state and off-state, but the power consumption is high and the circuit is bulky
Solution Approach 1:
The gate driver circuit is integrated directly into the solid-state switch device, merging previously separate components into a unified structure. This integration reduces the overall circuit size and allows for optimized power management, directly addressing the contradiction between reliability and power consumption by enabling compact design with lower energy usage.
Solution Approach 2:
The gate driver is designed with adjustable parameters including programmable threshold voltages and configurable drive strengths. By optimizing these parameters specifically for solid-state switch operation, the circuit achieves reliable switching control while minimizing power consumption, resolving the contradiction between control reliability and energy efficiency.
2Reliability
If existing gate driver circuits are used for solid-state switches, then the switch can be controlled, but the circuit size is large and integration is difficult
Solution Approach 1:
The gate driver circuit is integrated directly into the solid-state switch device, merging previously separate components into a unified structure. This integration reduces the overall circuit size and allows for optimized power management, directly addressing the contradiction between reliability and power consumption by enabling compact design with lower energy usage.
3Reliability
If solid-state switch turns off under shorted or overload conditions with significant inductance, then the switch protects the circuit, but high energy must be absorbed during turn-off
Solution Approach 1:
A snubber circuit is integrated into the gate driver to preemptively manage voltage spikes and energy dissipation during switch turn-off. This preliminary protective action prepares the circuit to handle inductive kickback and overload conditions, allowing the switch to safely protect the circuit while controlling the energy absorption through pre-configured damping elements.
Solution Approach 2:
The snubber circuit acts as an intermediary between the solid-state switch and the inductive load. It absorbs and dissipates the high energy during turn-off under shorted or overload conditions, protecting the switch from excessive voltage and current stress while enabling reliable circuit protection functionality.
4Use of energy by moving object
If a compact gate driver is designed for solid-state switch integration, then power consumption and size are reduced, but the circuit must handle high energy absorption during turn-off
Solution Approach 1:
The gate driver circuit is integrated directly into the solid-state switch device, merging previously separate components into a unified structure. This integration reduces the overall circuit size and allows for optimized power management, directly addressing the contradiction between reliability and power consumption by enabling compact design with lower energy usage.
Solution Approach 2:
A snubber circuit is integrated into the gate driver to preemptively manage voltage spikes and energy dissipation during switch turn-off. This preliminary protective action prepares the circuit to handle inductive kickback and overload conditions, allowing the switch to safely protect the circuit while controlling the energy absorption through pre-configured damping elements.
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 solution enables efficient operation of solid-state switches by reducing power consumption and size, allowing for effective energy management and fault detection, ensuring reliable performance under various conditions while maintaining a compact form factor.
Implementation Method 1
an isolated bias power circuit configured to output a dc voltage of at least fifteen volts
Implementation Method 2
a snubber circuit electrically connected across the first power terminal and the second power terminal
Data Source
AI summary
A circuitry includes an electronic solid-state switch including a first power terminal and a second power terminal and a driver and switch protection system electrically connected to the electronic solid-state switch. The driver and switch protection system includes an isolated bias power circuit configured to output a direct current voltage of at least fifteen volts, a current buffer circuit electrically connected between the isolated bias power circuit and the electronic solid-state switch, and a snubber circuit electrically connected to the first power terminal and the second power terminal.