Oscillator Circuit Peak Voltage Stabilization
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Solution Overview
Problem
The external synchronization method for generating a cyclic signal with a sloping waveform in switching power supply devices leads to fluctuations in peak voltage, affecting circuit operation.
Innovation Solution
An oscillator circuit that includes a first capacitor, a discharging circuit, a comparator, and a charging circuit, where the charging current is adjusted based on a judgment signal to maintain the peak voltage at a predetermined threshold, using a control voltage generating unit and voltage/current conversion circuit to stabilize the peak voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the external synchronization method is used to generate a cyclic signal, then the oscillator circuit can operate synchronously with an external circuit, but the peak voltage of the sloping waveform fluctuates according to the cycle of the reference clock signal
Solution Approach 1:
The patent implements a feedback mechanism where the peak voltage detection circuit monitors the peak voltage of the cyclic signal and generates a feedback signal that is sent back to the charging current control circuit. This feedback signal adjusts the charging current to maintain the peak voltage at a predetermined level, thereby resolving the contradiction between synchronization capability and peak voltage stability.
Solution Approach 2:
The patent changes the parameter of charging current dynamically based on the detected peak voltage level. By adjusting the charging current parameter in response to peak voltage fluctuations, the system maintains stable peak voltage while operating in external synchronization mode, thus resolving the contradiction between adaptability and stability.
2Adaptability or versatility
If the peak voltage of the cyclic signal changes, then the cyclic signal can adapt to different clock cycles, but the duty ratio of the pulse signal fluctuates causing adverse effects on circuit operation
Solution Approach 1:
The feedback signal generated by the peak voltage detection circuit is used to adjust the charging current, which in turn stabilizes the peak voltage and prevents duty ratio fluctuations. This feedback mechanism ensures reliable circuit operation while maintaining the ability to adapt to different clock cycles through controlled parameter adjustment.
Solution Approach 2:
By dynamically adjusting the charging current parameter based on detected peak voltage, the system maintains a stable duty ratio for the pulse signal. This parameter control prevents adverse effects on circuit operation reliability while preserving clock cycle adaptation capability through controlled voltage regulation.
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
The solution effectively suppresses peak voltage fluctuations, ensuring stable circuit operation by adjusting the charging current in response to the judgment signal, thereby maintaining the peak voltage at a consistent level.
Implementation Method 1
a comparator configured to compare the voltage at another, second terminal of the first capacitor having the aforementioned first terminal with a predetermined threshold voltage, and to generate a judgment signal that corresponds to the comparison result
Implementation Method 2
a charging circuit configured to generate a charging current the current value of which is adjusted according to the level of the judgment signal at a timing that corresponds to the synchronization signal, and to supply the charging current thus generated to the first capacitor
Implementation Method 3
a first discharging circuit configured to discharge the first capacitor at a timing that corresponds to a cyclic synchronization signal received from an external circuit
Implementation Method 4
the voltage at the second terminal of the first capacitor is output as a cyclic signal
Data Source
AI summary
A first capacitor is arranged such that the electric potential at a first terminal is fixed. A first discharging circuit discharges the first capacitor at a timing that corresponds to a cyclic synchronization signal received from an external circuit. A first comparator compares the voltage at a second terminal of the first capacitor with a predetermined threshold voltage, and generate a judgment signal that corresponds to the comparison result. A charging circuit generates a charging current the current value of which is adjusted according to the level of the judgment signal at a timing that corresponds to the synchronization signal, and supplies the charging current thus generated to the first capacitor.