Switching Regulator Frequency Stabilization via Phase Feedback
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Solution Overview
Problem
Existing DC-DC switching regulators face challenges in stabilizing their operating frequency due to changes in load, leading to unstable ripples in output voltage, which complicates the design of frequency-sensitive components and requires complex circuitry for frequency fixing.
Innovation Solution
A switching regulator design that incorporates a frequency compensator to adjust the turn-on time of the constant-time trigger circuit based on the output voltage and phase signal, using a voltage-to-current and current-to-voltage converter to generate a compensating signal that stabilizes the operating frequency by modifying the equation for turn-on time, thereby simplifying the circuit architecture and reducing chip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a PWM control method with fixed turn-on time is used, then the circuit structure is simple, but the operating frequency varies with load changes
Solution Approach 1:
The patent implements feedback control by detecting the actual operating frequency and comparing it with a target frequency. The frequency compensation circuit adjusts the turn-on time dynamically based on the frequency deviation, forming a closed-loop control system that maintains stable operating frequency despite load variations.
Solution Approach 2:
The patent transitions from a static fixed turn-on time approach to a dynamic adjustment mechanism. The compensation circuit continuously modifies the turn-on time parameter based on real-time frequency detection, enabling the system to adapt to changing load conditions while maintaining frequency stability.
2Stability of the object's composition
If complex frequency fixing circuitry is added, then the operating frequency can be stabilized, but the chip area and production cost increase
Solution Approach 1:
The patent merges the frequency detection and compensation functions into the existing control circuitry. The frequency compensation circuit shares components with the PWM control structure, integrating multiple functions into a unified design that reduces overall chip area while achieving frequency stabilization.
Solution Approach 2:
The frequency compensation circuit automatically detects and corrects frequency deviations without requiring external intervention or complex additional circuitry. The system self-regulates by using its own output frequency information to adjust its operating parameters, eliminating the need for separate complex control mechanisms.
Data Source
AI summary
A switching regulator for fixing a frequency which includes a power stage circuit, for receiving an input voltage and outputting an output voltage according to an control signal; a reference voltage generator for generating a reference voltage; a comparator for outputting a comparing result according to the output voltage and the reference voltage; a constant-time trigger circuit for outputting the control signal according to the comparing result and a compensating signal; an a frequency compensator for outputting the compensating signal according to the output voltage and a phase signal; wherein the phase signal is corresponding to the magnitude of the voltage across the lower gate switch of the power stage circuit.