High-Voltage Bulk Driver Bypass Circuit for Low-Voltage Gate Control
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Solution Overview
Problem
High-voltage transistor switch control circuits require expensive, large-area high-voltage components that provide poor performance due to their high-voltage ratings.
Innovation Solution
A bulk driver system using low-voltage transistors to drive high-voltage transistors, incorporating a pick circuit to couple voltages to the bulk of the high-voltage transistor in high or low impedance states, and a bypass circuit to manage impedance effectively, minimizing body diode effects and using laterally diffused transistors to handle high voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage rated components are used in control circuits, then the circuit can withstand high voltages, but the cost increases, device area increases, and performance deteriorates
Solution Approach 1:
The circuit is divided into two distinct voltage domains: a high-voltage domain for the power switch and a low-voltage domain for the control circuitry. This segmentation allows each domain to use components optimized for its specific voltage requirements, enabling low-voltage components to control high-voltage operations without requiring expensive high-voltage rated components throughout the entire circuit.
Solution Approach 2:
A specialized coupling circuit acts as an intermediary between the low-voltage control signal and the high-voltage power switch. This intermediary circuit translates and transmits control signals across the voltage boundary, allowing low-voltage components to effectively control high-voltage devices without direct exposure to high voltage stress.
2Reliability
If high-voltage rated components are used, then the circuit can operate at high voltages, but the performance and efficiency deteriorate
Solution Approach 1:
Different parts of the circuit are designed with different voltage ratings appropriate to their specific functions. The power switch and its associated high-voltage nodes use high-voltage components, while the control logic and signal processing circuits use low-voltage components. This local optimization ensures that each circuit element operates in its optimal performance regime without the penalties of using universally high-voltage rated components.
Solution Approach 2:
The circuit dynamically manages voltage parameters through controlled transitions and isolation mechanisms. By changing the voltage state of different circuit nodes independently and using isolation techniques, the system allows low-voltage control circuits to achieve high-voltage switching performance without suffering from the inherent performance limitations of high-voltage rated components.
Data Source
AI summary
This application discusses, among other things, apparatus and methods for driving the bulk of a high-voltage transistor using transistors having gates with low-voltage ratings. In an example, a bulk driver can include an output configured to couple to bulk of a high-voltage transistor, a pick circuit configured to couple the output to an input voltage at an input terminal of the high-voltage transistor or an output voltage at the output terminal of the high-voltage transistor when the high-voltage transistor is in a high impedance state, and a bypass circuit configured to couple the output of the bulk driver to the output voltage when the high-voltage transistor is in a low impedance state.