Voltage-Supply Circuit Stabilization via Segmented Holding Devices
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Solution Overview
Problem
Portable electronic devices with electro-optical displays face challenges in providing a low-ripple voltage to electro-optical devices, leading to fluctuations in the root-mean-square (rms) value of the voltage applied, which affects the quality of the display.
Innovation Solution
A voltage-supply circuit is designed with a first and second holding device connected in series, along with a potential-control circuit that shifts the potential at the second holding device to stabilize the voltage at the first holding device, reducing ripples by allowing electric charges to move between the devices and using feedback control to maintain a target voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is provided at the output stage of the power-supply circuit to hold the voltage, then the voltage can be smoothed and supplied to the load, but ripples appear in the voltage since the voltage across the capacitor is increased by switching while being gradually attenuated with power consumption by the load
Solution Approach 1:
The patent divides the single holding capacitor into two separate holding devices (first holding device and second holding device) connected in series. This segmentation allows independent control of each capacitor's voltage, enabling the potential-control circuit to stabilize the output voltage by adjusting the potential at the second end of the second holding device, thereby reducing voltage ripples while maintaining stability.
2Reliability
If feedback control is performed over the potential at the second end of the second holding device such that the hold voltage of the first holding device becomes equal to the target voltage, then the hold voltage is stabilized, but the circuit complexity increases
Solution Approach 1:
The patent implements feedback control through the potential-control circuit that monitors the voltage across the first holding device and adjusts the potential at the second end of the second holding device accordingly. This feedback mechanism stabilizes the output voltage by continuously correcting deviations from the target voltage, ensuring reliable voltage supply despite load variations or switching disturbances.
Data Source
AI summary
A power-supply circuit includes a capacitor, which is connected to a terminal at a first end while being grounded at the second end, for supplying a hold voltage between both ends thereof to a load; a capacitor connected, via a diode, to the terminal at a first end; an operational amplifier for raising a voltage at the second end of the capacitor, in response to a reduction in the hold voltage, such that the hold voltage becomes equal to a target voltage; and a transistor.