Dead Time Pulse Control for Low-Noise Switching Circuits
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Solution Overview
Problem
Existing audio amplifiers do not effectively reduce noise in output signals by controlling pulses of different widths, resulting in mixed noise.
Innovation Solution
A dead time generator is introduced to control pulses of different widths, converting them into pulses of constant width within a switching circuit, thereby reducing noise in the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a modulator generates an n-bit semi-digital signal and a D modulator generates an output signal, then the audio amplifier can process digital input signals, but noise is mixed in the output signal due to pulses of different widths
Solution Approach 1:
The dead time generator preemptively generates a dead time signal before the switching operation to ensure that both switching elements are simultaneously in an off state during the dead time period. This preliminary action prevents overlap of switching transitions and standardizes pulse widths before they reach the output, thereby eliminating noise caused by variable pulse widths while maintaining the digital signal processing capability.
2Productivity
If pulses of different widths are output from the switching circuit, then the switching elements can operate, but noise is generated in the output signal
Solution Approach 1:
The dead time generator acts as an intermediary component between the switching elements and the output signal path. It introduces a controlled dead time period that standardizes the pulse widths by ensuring both switching elements are simultaneously off during this interval. This intermediary action maintains the productivity of switching operations while eliminating the noise caused by pulses of different widths.
3Duration of action of stationary object
If no dead time is generated, then the switching circuit operates continuously, but pulses of different widths are produced causing noise
Solution Approach 1:
The dead time generator introduces a periodic dead time interval into the switching operation. During each switching cycle, both switching elements are forced into an off state for a predetermined dead time duration. This periodic action standardizes the pulse widths across all cycles, maintaining continuous operation while preventing the generation of noise from variable pulse widths.
Data Source
AI summary
A clock synchronization signal generator generates a dead time in which gates of both of two switching elements included in a switching circuit are in an off state, and generates the dead time for controlling a plurality of pulses having different widths to pulses having a constant width, which is output by the switching circuit.