Boost Circuit Switching for Diode-Free Voltage Output Stages
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Solution Overview
Problem
In existing voltage output devices, the diode in the boost circuit is subjected to high power, leading to potential damage and increased production costs.
Innovation Solution
A voltage output device design that incorporates a third transistor and a level shifter in the boost circuit, allowing synchronized switching with the second transistor to prevent huge current flow and eliminate body effect voltage drops, thereby substituting the diode with the transistor for enhanced reliability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a diode is used in the boost circuit to provide bias voltage for the transistors, then the transistor can operate with sufficient gate-source voltage, but the diode is subjected to huge current during switching transitions which can cause damage
Solution Approach 1:
The patent introduces a capacitor as an intermediary energy storage element between the power source and the transistor gate. This capacitor accumulates energy during the off-state and delivers it during the on-state, mediating the power transfer and eliminating the need for a diode to handle high current during switching transitions.
Solution Approach 2:
The patent replaces the diode's function with a transistor-based switch that copies the diode's voltage boosting function but without the current handling limitations. The transistor Q3 replicates the voltage multiplication effect of the diode while allowing for controlled current flow and eliminating the reverse recovery issues inherent in diode-based solutions.
2Power
If a diode is used in the boost circuit, then voltage boosting can be achieved, but production costs increase due to the need for high-power diodes
Solution Approach 1:
The patent replaces expensive high-power diodes with standard transistors and capacitors that are cheaper and more readily available. The transistor Q3 and capacitor C3 combination provides the same voltage boosting function using common, low-cost components that can be easily manufactured and replaced if needed.
3Reliability
If default time interval is used to prevent simultaneous conduction of transistors, then component damage from short-circuit is prevented, but there is a gap in current path during transition which affects continuous current flow
Solution Approach 1:
The patent uses the capacitor C3 to pre-charge and store energy before the transistor switches states. This preliminary energy storage ensures that when Q2 turns off and Q3 turns on, the capacitor immediately provides the necessary current path, eliminating the gap that would otherwise occur during the transition period.
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 solution effectively prevents diode damage from high currents and reduces production costs by utilizing the third transistor to manage power distribution, ensuring reliable operation and cost savings.
Implementation Method 1
the inductor 106 keeps current from changing
Implementation Method 2
the diode 202 keep charging to the capacitor 204
Data Source
AI summary
The present invention discloses a voltage output device for an electronic system, for transforming an input voltage for generating an output voltage for a load, which includes a first transistor, a second transistor, a first driving unit, a second driving unit, a control unit, a diode, an inductor, a first capacitor, and a boost circuit. The boost circuit includes a level shifter, a third transistor, and a second capacitor. Whether the third transistor 502 is turned on is synchronized with the second transistor 402, so as to prevent damage caused by a huge current passing through the third transistor when the second transistor is cut off.