Gate Driver Power Supply Sequencing to Prevent False Turn-On
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Solution Overview
Problem
Gate driver circuits often inadvertently turn on gated semiconductors due to unstable voltage values during power up, leading to unintended operation.
Innovation Solution
A power supply system for gate driver circuits that includes a switching power supply, full bridge rectifier, series and shunt regulating circuits, and a diode configuration to ensure logic, positive, and negative voltages are maintained within stable ranges, preventing unintended semiconductor activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a typical dedicated power source provides working voltage during power up, then the gate driver circuit can operate, but the voltage values are unstable and may cause the gated semiconductor to inadvertently turn on
Solution Approach 1:
The power supply circuit is designed to establish a stable logic voltage on the logic supply line before establishing a stable positive voltage on the positive voltage line during power-up. This preliminary action ensures that the gate driver circuit has reliable logic voltage for controlling the gated semiconductor before the positive voltage stabilizes, preventing inadvertent turn-on during the transient period.
Solution Approach 2:
The power supply uses dynamic voltage regulation with a series linear regulating circuit that actively adjusts the logic voltage based on real-time conditions. The circuit transitions from an unstable state during power-up to a stable regulated state, dynamically adapting the voltage output to maintain reliability while ensuring operation.
2Productivity
If the positive voltage rises quickly during power up, then power delivery is improved, but the logic voltage may drop below threshold and cause unintended semiconductor activation
Solution Approach 1:
The circuit design ensures that the logic voltage is established and stabilized before the positive voltage reaches its full value during power-up. This preliminary establishment of logic voltage prevents the scenario where rapid positive voltage rise could cause the logic voltage to drop below the threshold needed for reliable semiconductor control.
Solution Approach 2:
The series linear regulating circuit incorporates feedback mechanisms that monitor the logic voltage and adjust regulation accordingly. This feedback ensures that even if the positive voltage rises quickly, the logic voltage remains within the required threshold range, preventing unintended semiconductor activation while allowing fast power delivery.
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 system ensures that the logic voltage remains above a minimum value until the positive voltage drops below a certain threshold, preventing unintentional turn-on of gated semiconductors and maintaining stable operation even in the presence of noise.
Implementation Method 1
The full bridge rectifier is coupled to a secondary winding of the transformer
Implementation Method 2
The first shunt regulating circuit and the series linear regulating circuit regulates the logic voltage on the logic supply line
Implementation Method 3
The diode has a first terminal coupled to the logic supply line and a second terminal coupled to a negative supply line
Data Source
AI summary
A power supply for a gate driver circuit is provided. The power supply is configured to supply a logic voltage, a positive voltage and a negative voltage to the gate driver circuit such that a gated semiconductor driven by the gate driver circuit does not inadvertently turn on. The gate driver power supply is configured such that the logic voltage becomes a steady-state voltage prior to the positive voltage becoming a steady-state voltage and remains above a first voltage value until the positive voltage is less than a second voltage value.