Gate Control Circuit With Optical Auxiliary Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power switch modules face challenges in maintaining control and functionality when a short circuit failure occurs, as a faulty power switch can lead to power shutdown of the gate unit, making it difficult to control remaining operational power switches.
Innovation Solution
A gate control circuit is introduced, comprising a main gate unit and an auxiliary gate unit, where the auxiliary gate unit provides a continuous electrical signal to keep operational power switches in a conducting state, even if the main gate unit loses power, using an optical power converter and resistors to maintain voltage levels and ensure continued operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gate unit is powered from the main circuit, then the power module can operate with integrated power supply, but a short-circuited faulty power switch will eventually result in power shutdown of the gate unit, making control of remaining functional power switches difficult or impossible
Solution Approach 1:
The gate driver is divided into two independent power supply paths: the main circuit powers the main gate unit, while a separate auxiliary power supply (battery or capacitor) powers the auxiliary gate unit. This segmentation ensures that a fault in one power path does not affect the other, allowing the auxiliary gate unit to maintain control of operational power switches even when the main gate unit loses power due to a short-circuited switch.
Solution Approach 2:
The auxiliary gate unit acts as an intermediary control mechanism that takes over when the main gate unit fails. It provides a backup control path that can maintain operation of functional power switches by receiving control signals from the control device and directly driving the gates of operational power switches, bypassing the failed main gate unit.
2Reliability
If the auxiliary gate unit continuously provides gate signals to keep power switches in conducting state, then the power module can continue functioning during fault conditions, but additional power consumption is required
Solution Approach 1:
Instead of continuous power consumption, the auxiliary power supply uses periodic charging (from the main circuit when operational) and discharge (when main power fails). The capacitor stores energy during normal operation and releases it during fault conditions, while the battery provides sustained periodic support. This periodic action reduces overall power consumption compared to continuous auxiliary powering.
Solution Approach 2:
The system recovers and stores energy in the auxiliary power supply components (capacitor and battery) during normal operation when the main circuit is functional. This recovered energy is then utilized during fault conditions when the main power supply fails, eliminating the need for continuous external power and reducing overall energy consumption.
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
This solution allows the power module to continue functioning until the failed switch is replaced, reducing the risk of additional failures and power shutdowns, while minimizing power requirements and extending the lifespan of components like LEDs.
Implementation Method 1
an optical power converter, arranged to convert optical power from an LED into an auxiliary electrical gate signal
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~3
AI summary
It is presented a gate control circuit comprising: a main gate unit arranged to supply, via a plurality of main gate unit outputs, a gate signal to respective gates of a plurality of power switches, for controlling a main current; and an auxiliary gate unit comprising an optical power converter for converting incoming optical power to an auxiliary electrical gate signal. The auxiliary gate unit is arranged to, when a failure occurs in one of the plurality of power switches, provide the auxiliary electrical gate signal to respective gates of any of the plurality of power switches still being in operation. A corresponding power module and method are also presented.