Variable Voltage Power Supply for CMOS Circuits
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Solution Overview
Problem
In logic electronic circuits, particularly those using CMOS technology, transitioning between high and low supply voltages poses challenges due to current injection issues when both voltages are applied simultaneously, affecting power continuity and efficiency.
Innovation Solution
A device that selectively applies a variable voltage between a high and low voltage, ensuring continuity by generating a voltage ramp and using transistors to control the transition, preventing current injection by ensuring the second voltage is only applied when equal to the variable voltage, and includes a comparator to manage the voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both high voltage and low voltage are applied simultaneously to avoid power failure during transition, then power continuity is maintained, but current injection occurs from high voltage supply to low voltage supply
Solution Approach 1:
The patent applies preliminary action by gradually ramping up the low voltage from 0V to the target voltage before fully connecting it to the circuit. This gradual approach ensures that when both voltage supplies are connected, no potential difference exists between them, eliminating current injection while maintaining power continuity throughout the transition
Solution Approach 2:
The patent uses a voltage ramp generator as an intermediary component that creates a controlled intermediate voltage state. This intermediary mechanism allows smooth transition between voltage levels by providing a progressive voltage sequence, preventing direct conflict between high and low voltage supplies and avoiding harmful current injection
2Use of energy by moving object
If voltage is reduced from high to low to decrease power consumption, then energy consumption is reduced, but transition control complexity increases
Solution Approach 1:
The patent implements self-service through a feedback control mechanism where a comparator continuously monitors the circuit voltage and automatically controls the ramp generator to maintain the desired voltage transition. This self-regulating system simplifies overall control by using the system's own state information to automatically manage the voltage transition process
Solution Approach 2:
The patent applies feedback control by using a comparator to monitor the actual circuit voltage and feed this information back to control the voltage ramp generator. This closed-loop feedback mechanism ensures accurate voltage transitions while simplifying control complexity through automatic adjustment based on real-time voltage measurements
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
Ensures seamless voltage transitions without current injection, maintaining power continuity and reducing energy consumption by allowing controlled switching between high and low voltage modes.
Implementation Method 1
at least one transistor connected to a fixed voltage... one of which is linked to a fixed voltage and gates able to be controlled independently
Implementation Method 2
a comparator of the measured voltage and of the voltage generated by the generator
Data Source
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AI summary
The device has a variable voltage application unit consisting of a control module (CMD), voltage source (V) and transistors, for applying a variable voltage varying from a value equal to a high voltage to a value equal to a low voltage (Vlow), to a supply terminal. Another voltage application unit consists of a control unit, controlled switch (K2) and another transistor, for selectively supplying the low voltage to a supply terminal (L) when the variable voltage attains the low voltage. A measurement unit measures the voltage in the supply terminal.