Pulse Width Modulation Circuit Dynamic On-Time Control
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Solution Overview
Problem
Existing power supply control circuits fail to perform optimum feedback control based on load variations due to fixed on-time settings, leading to inefficient power delivery and increased ripple amplitude.
Innovation Solution
A circuit device with a pulse signal output circuit and driving circuit that compares detection voltage with a reference voltage, dynamically changing the on-time of the switching element based on load conditions through hysteresis control, ensuring continuous power supply and minimizing ripple.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the on time of the main switch is fixed, then the control circuit is simple to implement, but the feedback control cannot be optimized according to load variations
Solution Approach 1:
The patent implements dynamic on-time control where the main switch on-time is no longer fixed but varies based on load conditions. The control circuit dynamically adjusts the on-time parameter in response to detected output voltage or current levels, enabling adaptive feedback control that optimizes power delivery across varying load conditions while maintaining circuit simplicity through parameter-based control rather than complex circuit reconfiguration
2Stability of the object's composition
If the on time of the main switch is fixed, then the circuit operation is stable, but the ripple amplitude increases and power delivery efficiency decreases
Solution Approach 1:
The patent changes the on-time parameter of the main switch from a fixed value to a dynamically adjustable parameter. By modifying the on-time parameter based on detected output conditions (voltage or current), the circuit maintains stable operation while reducing ripple amplitude and improving power delivery efficiency. The parameter change enables the system to adapt to varying load conditions without compromising operational stability
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
Enables adaptive feedback control, reducing ripple amplitude and ensuring continuous power delivery across varying loads by dynamically adjusting the on-time of the switching element, outperforming fixed on-time methods.
Implementation Method 1
a pulse signal output circuit configured to perform comparison between a detection voltage and a reference voltage
Data Source
AI summary
A circuit device includes a pulse signal output circuit and a driving circuit. The pulse signal output circuit, when a detection voltage has decreased below a reference voltage, changes a pulse signal to an active level at which a switching element is turned on. The pulse signal output circuit, after the detection voltage has decreased below the reference voltage, performs monitoring as to whether or not the detection voltage has exceeded the reference voltage, and upon detecting that the detection voltage has exceeded the reference voltage, changes the pulse signal to an inactive level at which the switching element is turned off. The driving circuit outputs a driving signal based on the pulse signal to the switching element.