Voltage Boosting Circuit Duty Detection Control
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Solution Overview
Problem
Voltage boosting/lowering circuits face inefficiencies due to constant on-time ratios for switching elements, leading to increased internal losses when load current changes, as they perform unnecessary voltage boosting operations even when the voltage boosting operation is not required.
Innovation Solution
A voltage boosting/lowering circuit with a duty detection circuit that adjusts the on-time ratio of the second switch element based on the detected duty ratio of the first pulse signal, allowing for controlled voltage boosting and lowering operations without increasing internal losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the on-time ratio of the second switching element is increased to enable voltage boosting operation, then the output voltage can be boosted, but the internal loss increases due to unnecessary voltage boosting operations when not required
Solution Approach 1:
The patent applies dynamics by making the on-time ratio of the second switching element variable rather than fixed. The control circuit dynamically adjusts the on-time ratio based on the operating mode (voltage boosting or voltage lowering) and load conditions. This allows the circuit to perform voltage boosting only when necessary (when input voltage is below output voltage) and avoids unnecessary boosting operations, thereby reducing internal losses while maintaining the ability to boost output voltage when required.
2Stability of the object's composition
If the voltage boosting circuit operates continuously to maintain output voltage, then the output voltage stability is improved, but the power efficiency deteriorates due to unnecessary voltage boosting operations
Solution Approach 1:
The patent implements periodic action by using pulse-width modulation (PWM) control to switch the voltage boosting circuit on and off periodically. The control circuit monitors the output voltage and activates the voltage boosting circuit only during periods when boosting is required (when input voltage drops below the level needed to maintain output voltage). This periodic operation maintains output voltage stability while avoiding continuous operation that would waste energy during periods when boosting is not needed.
3Device complexity
If the on-time ratio is kept constant for simple control, then the device complexity is reduced, but the adaptability to load current changes deteriorates
Solution Approach 1:
The patent applies feedback by incorporating a control circuit that monitors the output voltage and load conditions, then adjusts the on-time ratio of the second switching element accordingly. The control circuit receives feedback about the actual operating conditions and dynamically modifies the switching parameters to maintain optimal performance. This feedback mechanism enables the circuit to adapt to varying load currents while keeping the control structure relatively simple, as the adjustment is automatic based on monitored parameters.
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
This solution enables the circuit to perform voltage boosting and lowering operations efficiently, reducing internal losses by adapting to changes in load current and avoiding unnecessary voltage boosting, thus enhancing power efficiency.
Implementation Method 1
an inductance element connected between a connection node of the first switching element and a connection node of the second switching element
Data Source
AI summary
A voltage boosting/lowering circuit according to an aspect of the present invention includes an output voltage generation circuit 15 that includes a switch element 2 connected between an input terminal 1 and a choke coil 3 and a switch element 7 connected between the choke coil 3 and a ground, and generates an output voltage by switching the switch elements 2 and 7 between an on-state and an off-state and thereby boosting/lowering an input voltage input to the input terminal 1, a first switch control unit that outputs a first pulse signal to the switch element 2, a duty detection circuit 32 that detects a duty of the first pulse signal, and a second switch control unit that outputs a second pulse signal to the switch element 7 according to the detected duty.