Transistor Driving Controller Dynamic Voltage Adjustment
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Solution Overview
Problem
In electrical power conversion driving controllers, transistors used to replace diodes increase power loss due to parasitic body diode conduction, and controlling the transistor's turn-off time is challenging, leading to inefficient power reduction.
Innovation Solution
A driving controller with a first and second adjustment unit coupled to the transistor's control terminal, dynamically adjusting the voltage at the control terminal using reference voltages to optimize the transistor's on-resistance and reduce power loss by controlling the turn-off time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a transistor is used to replace a diode to reduce power loss, then power loss is reduced, but parasitic body diode conduction increases power loss
Solution Approach 1:
The patent applies dynamic control of the transistor's control terminal voltage to optimize performance. By dynamically adjusting the voltage at the control terminal based on the operation voltage, the transistor's on-resistance is optimized while preventing parasitic body diode conduction, thus resolving the contradiction between reducing power loss and avoiding parasitic conduction losses.
Solution Approach 2:
The patent changes the voltage parameter at the transistor's control terminal dynamically. By comparing the operation voltage with reference voltages and adjusting the control terminal voltage accordingly, the system optimizes the transistor's resistance characteristics and prevents parasitic body diode activation, thereby reducing overall power loss.
2Loss of energy
If the transistor is turned off early to reduce body diode conduction, then power loss is reduced, but the effect is worsened due to timing issues
Solution Approach 1:
The patent implements a feedback control mechanism where the control terminal voltage is adjusted based on feedback from voltage comparisons. The controller continuously monitors the operation voltage and adjusts the control terminal voltage accordingly, ensuring optimal turn-off timing that maximizes power loss reduction while maintaining effectiveness.
Solution Approach 2:
The patent performs preliminary voltage adjustment at the control terminal before the transistor needs to turn off. By proactively adjusting the control terminal voltage based on predicted or anticipated conditions, the system optimizes the turn-off timing and prevents parasitic body diode conduction, thereby improving power loss reduction effectiveness.
3Ease of operation
If the voltage at the control terminal is pulled down to turn off the transistor, then the transistor turns off, but the turn-off delay time cannot be shortened
Solution Approach 1:
The patent applies preliminary action by adjusting the control terminal voltage proactively based on operation voltage conditions. By preparing the control terminal voltage in advance according to anticipated transistor state changes, the system reduces turn-off delay time and speeds up the transistor turn-off process while maintaining ease of control.
Solution Approach 2:
The patent employs dynamic voltage adjustment at the control terminal rather than simple pull-down. By dynamically optimizing the control terminal voltage based on real-time operation conditions and reference voltage comparisons, the system achieves faster turn-off speed while maintaining operational simplicity and control ease.
Data Source
AI summary
A driving controller for driving a transistor, includes an operation unit, a first adjustment unit, a second adjustment unit, a first comparator, a comparison unit. A first terminal of the transistor receives an operation voltage. The operation unit is coupled to a control terminal of the transistor. The first adjustment unit is used to increase a voltage of the control terminal of the transistor. The second adjustment unit is used to decrease the voltage of the control terminal of the transistor. The first comparator and the comparison unit are coupled to the first terminal of the transistor and used to compare the operation voltage with a first reference voltage to a third reference voltage respectively so that the transistor may be controlled accordingly.