Voltage Conversion Circuit with Dynamic Transistor Bulk Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional voltage conversion circuits suffer from decreased conversion efficiency due to switch currents generated through parasitic capacitors, which are part of the output current, especially when connected to light loads.
Innovation Solution
The proposed voltage conversion circuit incorporates a current comparator to determine load type, adjusting the driving signals and switching currents to minimize parasitic capacitance and power consumption by using a multiplexer, drivers, and a clock generator that adjusts frequency based on load conditions, thereby reducing switching currents and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional voltage conversion circuit uses fixed driving waveform for both N type and P type transistors, then the circuit structure is simple, but the conversion efficiency decreases due to switch currents through parasitic capacitors
Solution Approach 1:
The patent applies dynamics by making the driving waveform adaptable to load conditions. The controller adjusts the driving waveform of the P type transistor based on whether the load is light or heavy, transforming the fixed static system into a dynamic one that optimizes performance across different operating conditions
Solution Approach 2:
The patent changes the parameter of driving waveform characteristics based on load conditions. When light load is detected, the P type transistor is prevented from switching to reduce parasitic capacitor current. This parameter change in driving control resolves the contradiction between simple structure and high efficiency
2Manufacturing precision
If N type transistor switches frequently to regulate output voltage, then voltage regulation precision is improved, but switch current through parasitic capacitor increases reducing efficiency
Solution Approach 1:
The patent uses feedback by detecting the load condition and using this information to control the P type transistor switching. The controller receives feedback about load status and adjusts the driving waveform accordingly, preventing unnecessary switching that would generate parasitic capacitor currents while maintaining voltage regulation precision
Solution Approach 2:
The patent applies periodic action by using pulse width modulation (PWM) for the N type transistor to maintain precise voltage regulation, while complementing it with conditional periodic switching of the P type transistor based on load detection, optimizing the balance between regulation precision and switching loss
3Stability of the object's composition
If P type transistor is always switched to maintain output voltage, then output voltage stability is improved, but power consumption increases due to continuous switching
Solution Approach 1:
The patent makes the P type transistor switching dynamic rather than continuous. The transistor switches only when needed based on load conditions detected by the controller, creating an adaptive system that maintains voltage stability while minimizing unnecessary switching operations and associated power consumption
Solution Approach 2:
The patent extracts the continuous switching function from the P type transistor and replaces it with conditional switching based on load detection. By taking out the unnecessary continuous switching operation and retaining only the essential voltage regulation function, the system maintains stability while reducing power consumption
Data Source
AI summary
A voltage conversion circuit is disclosed. The voltage conversion circuit comprises an energy-storing inductor, an N-type transistor, a P-type transistor, a current comparator, a multiplexer, a first driver and a second driver. When load connected to the voltage conversion circuit is a light load, the P-type transistor will be switched off so as to avoid generating a switching current and the switching current flowing gate-source and gate-drain parasitic capacitor of the N-type transistor is generated from an input voltage. The number of N-type transistor and switching frequency also decrease accordingly so that voltage conversion efficiency of the voltage conversion circuit may be increased.