Boosting Chopper Oscillation Control for Voltage Stability
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Solution Overview
Problem
Existing power supply control devices using boosting choppers face challenges in maintaining output voltage stability and responsiveness when loads suddenly increase, as they struggle to effectively reduce the change speed of oscillation waves during voltage drops.
Innovation Solution
A power supply control device that includes a switch control unit for managing the ON/OFF state of a switching device using an oscillation wave, with an oscillation control unit that gradually decreases the change speed of the oscillation wave during voltage drops by reducing the charge current supplied to a capacitor, and a current output amplifier that adjusts the current based on the difference between a reference voltage and a detected voltage, ensuring the oscillation control unit remains enabled beyond a threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the change speed of the oscillation wave is reduced during voltage drops to prevent output voltage drops, then the responsiveness in preventing output voltage drops is improved, but the switching frequency decreases and the ON period increases which may cause audible noise
Solution Approach 1:
The oscillation control unit dynamically adjusts the change speed of the oscillation wave based on the detected output voltage level. When output voltage drops are detected, the change speed is reduced during the ON period to extend the ON time and prevent voltage drops. When voltage is stable, the normal oscillation speed is restored. This dynamic adaptation resolves the contradiction by applying different oscillation characteristics under different operating conditions.
Solution Approach 2:
The patent changes the parameter of oscillation wave change speed (slope) based on the output voltage condition. By reducing the change speed parameter during voltage drops and maintaining normal parameters during stable operation, the system achieves both voltage stability and noise prevention. The oscillation control unit implements this by selectively adjusting the ramp wave generation parameters.
2Reliability
If the ON period of the switching device is increased to prevent output voltage drops, then the output voltage stability is improved, but the switching losses increase and efficiency decreases
Solution Approach 1:
The patent uses periodic oscillation waves (ramp waves) to control the switching device. By generating regular oscillation cycles, the system achieves continuous regulation of the ON period. The oscillation control unit modifies these periodic actions by adjusting the change speed during critical periods, allowing the system to maintain voltage stability while managing switching losses through controlled periodic operation rather than extended continuous ON states.
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
This solution enhances the responsiveness in preventing output voltage drops by reducing the change speed of the oscillation wave, thereby increasing the ON period of the switching device and stabilizing the output voltage, while preventing sudden changes in element currents that could cause audible noise.
Implementation Method 1
The oscillator may have a capacitor. The oscillator may have a charge and discharge circuit for charging and discharging the capacitor.
Implementation Method 2
The oscillation control unit may reduce a charge current supplied to the capacitor by the charge and discharge circuit, in response to a drop in the DC output voltage.
Implementation Method 3
The current output amplifier may have a current output amplifier for reducing a current corresponding to a difference between a reference voltage and a detection voltage obtained by detecting the DC output voltage from the charge current.
Data Source
AI summary
Recently, it is desired to improve responsiveness in case where a drop in the output voltage is prevented. A power supply control device is provided, comprising a switch control unit for controlling an ON/OFF state of a switching device of a boosting chopper using an oscillation wave, a voltage acquisition unit for acquiring DC output voltage corresponding to an output of the boosting chopper, and an oscillation control unit for reducing a change speed of the oscillation wave during at least a part of a period during which the switching device is in an ON state, in response to a drop in the DC output voltage.