Bidirectional Switch Driver Bias Generation with One Supply
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Solution Overview
Problem
Existing bidirectional switch control circuits require two isolated voltage sources to apply different voltage levels to the bias terminals of two drivers, leading to inefficiency, higher cost, and bulkiness.
Innovation Solution
A bias generator that generates different bias voltages using a single voltage supply for the drivers of a bidirectional switch, reducing the need for multiple voltage sources and minimizing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two isolated voltage sources are used to apply different voltage levels to the bias terminals of two drivers, then the bidirectional switch can achieve proper voltage blocking and switching control, but the circuit becomes bulkier, more expensive, and less efficient
Solution Approach 1:
The patent combines two isolated voltage sources into a single voltage source that generates both bias voltages through a bootstrap circuit. The single voltage source is coupled to a bootstrap capacitor that generates first and second bias voltages at different levels, eliminating the need for two separate isolated voltage sources while maintaining the required voltage blocking capability.
Solution Approach 2:
The single voltage source performs multiple functions by generating both the first bias voltage for the first driver and the second bias voltage for the second driver through the bootstrap circuit. This multi-functional approach replaces the traditional requirement for two dedicated isolated voltage sources, reducing circuit complexity while maintaining proper switching control.
2Ease of operation
If two isolated voltage sources are used to bias the drivers, then proper voltage levels can be maintained for bidirectional switching, but power loss increases and efficiency decreases
Solution Approach 1:
By merging the two isolated voltage sources into a single voltage source with a bootstrap circuit, the patent reduces the total power consumption. The bootstrap capacitor efficiently generates the required voltage levels without the continuous power loss associated with maintaining two separate isolated voltage sources, thereby improving overall system efficiency.
3Reliability
If two isolated voltage sources are used, then the circuit can provide proper biasing for both drivers, but the cost and size of the circuit increase
Solution Approach 1:
The patent merges two separate voltage source circuits into a single compact voltage source with an integrated bootstrap circuit. This consolidation significantly reduces the circuit board space required, eliminating the need for two separate isolated voltage sources while maintaining proper biasing for both drivers.
Data Source
AI summary
A circuit includes a first driver, a second driver, and a bias generator. First driver has a first bias terminal, a first reference terminal, a first driver input, and a first driver output. The second driver has a second bias terminal, a second reference terminal, a second driver input, and a second driver output. The bias generator has a first input, a second input, a first bias output, and a second bias output, the first input coupled to the first reference terminal, the second input coupled to the second reference terminal, the first bias output coupled to the first bias terminal, and the second bias output coupled to the second bias terminal, wherein the bias generator is configurable to generate, based on a supply voltage, a first bias voltage at the first bias output and a second bias voltage at the second bias output.