Load-Dependent Frequency Jittering Circuit for Power Loss Reduction
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Solution Overview
Problem
Conventional frequency jittering circuits do not dynamically adjust frequency based on load conditions, leading to unnecessary frequency jittering in light-load or no-load conditions, which increases ripple and power loss.
Innovation Solution
A load-dependent frequency jittering circuit and method that includes a load condition detection circuit, a number generator, and a digital-to-analog converter to generate a jittered frequency based on load conditions, using switching signals such as PWM or current sensing signals to control the oscillator's output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency jittering is applied continuously, then electromagnetic interference is reduced, but power loss and ripple increase in light-load or no-load conditions
Solution Approach 1:
The frequency jittering circuit dynamically adjusts its operation based on load conditions. The load condition detection circuit monitors the load and controls the number generator to enable or disable frequency jittering accordingly. This dynamic adaptation allows the system to apply frequency jittering only when necessary (heavy-load conditions) and avoid it when unnecessary (light-load or no-load conditions), thereby reducing power loss and ripple while maintaining electromagnetic interference reduction when needed.
2Object-affected harmful factors
If frequency jittering is applied continuously, then electromagnetic interference is reduced, but ripple increases in light-load or no-load conditions
Solution Approach 1:
The system dynamically controls frequency jittering based on real-time load detection. When the load condition detection circuit detects light-load or no-load conditions, it disables the number generator, thereby stopping frequency jittering and preventing ripple increase. When heavy-load conditions are detected, frequency jittering is enabled to reduce electromagnetic interference. This dynamic control resolves the contradiction by adapting the jittering behavior to actual system needs.
3Object-affected harmful factors
If frequency jittering is applied continuously, then electromagnetic interference is reduced, but efficiency decreases in light-load or no-load conditions
Solution Approach 1:
The load-dependent frequency jittering circuit dynamically adjusts operation based on load conditions. The load condition detection circuit monitors system state and controls the number generator to enable frequency jittering only during heavy-load conditions where it provides electromagnetic interference reduction benefits. During light-load or no-load conditions, frequency jittering is disabled to maintain high efficiency, thus resolving the contradiction between EMI reduction and efficiency.
Data Source
AI summary
The present invention discloses a load-dependent frequency jittering circuit, comprising: a load condition detection circuit for receiving a switching signal and generating an output according to a load condition; a number generator for receiving the output of the load condition detection circuit and generating a number; a digital to analog converter for converting the output of the number generator to an analog signal; and an oscillator for generating a jittered frequency according to the output of the digital to analog converter.