Voltage Converter Regulating Circuit Control Chip
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Solution Overview
Problem
Existing voltage converters face challenges in stabilizing output voltage and improving conversion efficiency due to oscillations caused by small equivalent serial resistance, leading to increased power dissipation and susceptibility to electromagnetic interference.
Innovation Solution
A voltage converter system incorporating a regulating circuit, a first comparator, and an active-duration adjusting circuit that adjusts the active duration of the pulse signal based on a comparison between a reference signal and the output voltage feedback, using a second reference signal dependent on the duty cycle to control the pulse signal, thereby stabilizing the output voltage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse signal active duration is not properly adjusted, then the output voltage becomes unstable and power dissipation increases, but adjusting the active duration requires additional control circuits that increase device complexity
Solution Approach 1:
The patent combines the reference signal generation and pulse width modulation control into a single integrated controller. The controller generates both the oscillating reference signal and compares it with feedback voltage to produce the pulse signal with adjusted active duration, merging multiple functions into one component to avoid increasing overall device complexity while achieving stable output voltage control
Solution Approach 2:
The patent implements a feedback mechanism where the output voltage is fed back to the controller, which compares the feedback voltage with an oscillating reference signal. This closed-loop feedback system automatically adjusts the pulse signal active duration to maintain stable output voltage, resolving the contradiction between reliability improvement and complexity increase
2Loss of energy
If the equivalent serial resistance is small, then the voltage converter operates efficiently, but oscillations occur that increase electromagnetic interference susceptibility
Solution Approach 1:
The patent employs periodic pulse width modulation where the active duration of the pulse signal is rhythmically adjusted based on the comparison between oscillating reference signal and feedback voltage. This periodic control action stabilizes the output voltage and suppresses oscillations caused by small equivalent serial resistance, reducing electromagnetic interference while maintaining efficient operation with low power dissipation
Data Source
AI summary
A voltage converter having a regulating circuit controlled by a duration adaptive pulse signal is disclosed. An input voltage is regulated by the regulating circuit according to the pulse signal to generate an output voltage. A first comparator of the voltage converter compares a first reference signal with a feedback value of the output voltage and thereby generates a first comparator output. The first reference signal fluctuates with the pulse signal. The voltage converter further includes an active-duration adjusting circuit that starts the active duration of the pulse signal in accordance with the first comparator output and ends the active duration of the pulse signal in accordance with a second reference signal. The DC value of the second reference signal depends on the duty cycle of the pulse signal.