Switching Regulator Abnormality Detection via Delta-Sigma Modulation
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Solution Overview
Problem
Existing switching regulators employing PWM modulation schemes for power supply voltage detection are not applicable to delta-sigma modulation schemes, and require complex control circuits for voltage monitoring and switching control, which is inefficient for instantaneous power supply voltage drops.
Innovation Solution
A switching regulator incorporating a delta sigma modulation circuit and an instantaneous voltage drop detection circuit that generates a control signal based on the error between output and reference voltages, using a simple digital circuit configuration to detect power supply abnormalities and stabilize output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage monitoring control circuit is used to detect power supply voltage abnormalities, then detection capability is improved, but device complexity increases
Solution Approach 1:
The delta-sigma modulation circuit inherently generates a clock signal whose duty cycle reflects the power supply voltage status. The abnormality detection circuit simply monitors this existing signal without requiring external voltage sensing components, making the system self-diagnostic and eliminating complex control circuits.
2Reliability
If PWM modulation scheme is used with voltage monitoring, then power supply abnormality detection is achieved, but adaptability to different modulation schemes is reduced
Solution Approach 1:
The invention utilizes the clock signal generated by the delta-sigma modulation circuit itself for dual purposes: normal switching control and power supply abnormality detection. This multi-functional approach allows the same circuit architecture to serve both PWM and delta-sigma modulation schemes, enhancing adaptability across different modulation types.
Data Source
AI summary
A switching regulator includes: a switching element that controlling supply of power supply voltage according to a control signal; a smoothing circuit smoothing the power supply voltage supplied via the switching element and supplying the smoothed power supply voltage as an output voltage to an output terminal; an error amplifier outputting an error signal according to a difference between the output voltage supplied to the output terminal and a reference voltage; a delta sigma modulation circuit generating a delta sigma modulation signal according to the error signal; and a power supply abnormality detection circuit outputting the delta sigma modulation signal as the control signal and detecting an abnormality in the power supply voltage based on the delta sigma modulation signal.