Self-Powered Gate Driver Pre-Charge Circuit
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Solution Overview
Problem
Self-powered gate driver systems (SPGDSs) face challenges in maintaining a charge during periods of inactivity, leading to delays and sudden transitions that cause current and torque surges, which can increase wear on system components, and existing solutions incur costs associated with dedicated power supplies for each driver.
Innovation Solution
A pre-charge circuit that uses a transformer to induce an alternating current in a current loop, which is isolated from the SPGDS, and rectifies the induced current to deliver a trickle charge to energy storage devices, maintaining the SPGDS in a ready state without the need for individual power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a self-powered gate driver system is used to avoid dedicated power supplies, then system cost and complexity are reduced, but the system cannot maintain charge during periods of inactivity, causing delays and sudden transitions
Solution Approach 1:
The pre-charge circuit performs preliminary charging of the energy storage device before the gate driver system needs to operate. By continuously or periodically charging the capacitor during idle periods through the transformer and rectifier, the system ensures energy is available immediately when needed, eliminating startup delays while maintaining the self-powered architecture.
Solution Approach 2:
The pre-charge circuit acts as an intermediary between the power source and the gate driver system. It includes a transformer that couples to a control power source and induces current in an isolated current loop, then rectifies the induced current to deliver trickle charge to the energy storage device. This intermediary structure enables charge maintenance without requiring a dedicated power supply directly connected to each driver.
2Device complexity
If the gate driver system operates without pre-charging, then system simplicity is maintained, but current and torque surges occur during transitions, increasing component wear
Solution Approach 1:
The pre-charge circuit performs preliminary charging of the energy storage device before the gate driver system needs to operate. By ensuring the capacitor is charged in advance during idle periods, the system can immediately drive the SCR gates when needed, preventing sudden current and torque surges that would otherwise occur during startup transitions.
Solution Approach 2:
The energy storage device, when pre-charged by the pre-charge circuit, acts as a cushion or buffer that can immediately supply the necessary gate drive current. This pre-stored energy cushions against the harmful effects of sudden current surges by providing smooth, immediate power delivery during transitions, reducing mechanical torque shocks and electrical stress on components.
3Reliability
If dedicated power supplies are used for each driver, then system reliability is improved, but system cost and size increase
Solution Approach 1:
The pre-charge circuit merges the power supply function for multiple drivers into a single circuit. Instead of having separate dedicated power supplies for each driver, one pre-charge circuit with a transformer and rectifier serves multiple energy storage devices, which in turn power multiple drivers. This consolidation reduces the total number of power supply components while maintaining reliable operation.
Solution Approach 2:
The pre-charge circuit performs multiple functions: it provides power conversion through the transformer, rectification of AC to DC current, and charging of multiple energy storage devices. This multi-functional circuit replaces what would otherwise require multiple separate power supply units, reducing system complexity while ensuring each driver has reliable power availability.
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 pre-charge circuit ensures that SPGDSs can restart immediately, reducing delays and preventing current and torque surges, while avoiding the costs and complexity of dedicated power supplies for each driver, thus improving system reliability and longevity.
Implementation Method 1
The transformer induces an alternating current in a current loop in the pre-charge circuit
Implementation Method 2
The induced currents within the coils are rectified and delivered to an energy storage device in a SPGDS
Data Source
AI summary
An apparatus and method used to charge a self powered gate driver system. The apparatus may include a current loop for inducing a current in a coil. A bridge rectifier may rectify the current induced in the coil and charge a capacitor used to power a driver in a self powered gate driver system. The current loop and coil may be separated by a dielectric to prevent current from passing between the self powered gate driver system and the current loop. The current loop may couple to a line voltage transformer to drive an alternating current through the current loop. In certain embodiments, a single current loop and transformer may charge a plurality of self powered gate driver systems.