Boost Circuit Pulse-Width Modulation Limiting Controller
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Solution Overview
Problem
Conventional boost circuits experience high power consumption and manufacturing costs due to output voltage peaking above rated levels, requiring electronic components with higher withstand voltage and reliability.
Innovation Solution
A boost circuit with a pulse-width modulation limiting controller (PWMLC) that controls the switch to limit output voltage to a stable value, reducing peak amplitude and thus lowering power consumption and manufacturing costs, using a feedback control circuit with a voltage/current detector, oscillator, modulator, soft starting unit, and feedback controller to generate an output signal with fixed periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional feedback control is used without voltage limiting, then the output voltage can reach its peak value P, but the power consumption increases and manufacturing costs rise due to higher withstand voltage requirements for components
Solution Approach 1:
The PWMLC performs preliminary action by detecting the voltage across the switch before it reaches dangerous peak levels and preemptively adjusting the duty cycle to limit the output voltage. This prevents the voltage from rising to peak value P in the first place, thereby avoiding the need for high-withstand-voltage components and reducing power consumption while maintaining component reliability.
Solution Approach 2:
The invention implements a feedback mechanism where the PWMLC continuously monitors the switch voltage and dynamically adjusts the duty cycle based on real-time conditions. When the detected voltage approaches the limiting threshold, the controller reduces the duty cycle to maintain voltage within safe limits, creating a closed-loop control system that balances reliability and power consumption.
2Power
If conventional feedback control allows voltage to rise to peak value P, then the output voltage can achieve higher levels, but the manufacturing costs increase due to higher withstand voltage requirements
Solution Approach 1:
The PWMLC dynamically changes the duty cycle parameter based on the detected switch voltage. By adjusting this control parameter in real-time, the system maintains output voltage within a safe range that prevents excessive peak values, thereby allowing the use of standard-rated components and reducing manufacturing costs while still achieving adequate output voltage levels.
Solution Approach 2:
The controller performs preliminary voltage limiting by detecting and responding to voltage trends before peak values are reached. This preemptive control prevents the need for high-withstand-voltage components, reducing manufacturing costs while maintaining sufficient output voltage for normal operation.
3Power
If the output voltage is allowed to rise to peak value P in conventional circuits, then the voltage can exceed rated levels, but this requires electronic elements with higher withstand voltage and reliability
Solution Approach 1:
The PWMLC uses feedback control by continuously monitoring the switch voltage and dynamically adjusting the duty cycle. When the voltage approaches the limiting threshold, the controller reduces the duty cycle to maintain voltage within safe limits, preventing components from experiencing excessive voltage stress while maintaining adequate output voltage.
Solution Approach 2:
The controller performs preliminary protection by detecting voltage trends and preemptively adjusting the duty cycle before dangerous peak voltages occur. This prevents components from being exposed to excessive voltage stress, allowing the use of standard-rated components with lower withstand voltage requirements.
Data Source
AI summary
The proposed boost circuit includes a DC/DC converter having a switch, receiving an input voltage and outputting an input voltage feedback signal, an output voltage feedback signal, an input current feedback signal and an output voltage after a boost of the input voltage, and a feedback control circuit having a pulse-width modulation limiting controller, coupled to the converter, receiving the input voltage feedback signal, the output voltage feedback signal and the input current feedback signal and generating an output signal with a fixed time period. The output signal is employed to control the switching of the switch so as to generate the boost.