Duty Ratio Correction Circuit Using Intermittent Charge Pump Control
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Solution Overview
Problem
Existing duty ratio correction circuits consume high power due to continuous current flow in duty ratio detection circuits, which increases energy consumption and circuit complexity.
Innovation Solution
A duty ratio correction circuit utilizing a charge pump to intermittently charge and discharge a capacitor, allowing for power-efficient operation by balancing charge and discharge currents, thereby reducing overall power consumption and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous current flow is used in duty ratio detection circuits, then duty ratio correction can be achieved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using intermittent charging and discharging of a capacitor instead of continuous current flow. The charge pump circuit charges the capacitor during specific intervals and discharges it during other intervals, creating a periodic operation mode that maintains duty ratio detection functionality while significantly reducing average power consumption.
Solution Approach 2:
The patent changes the operational parameters from continuous current flow to intermittent charge/discharge cycles. By controlling the charging and discharging timing and duration of the capacitor, the circuit achieves duty ratio correction through parameter modulation rather than sustained current, thereby reducing power consumption while maintaining measurement precision.
2Measurement precision
If complex duty ratio detection circuits are used, then accurate duty ratio correction can be achieved, but circuit complexity increases
Solution Approach 1:
The patent merges the duty ratio detection and correction functions into a single integrated circuit block. The charge pump circuit combines the capacitor charging and discharging operations within one unified structure, eliminating the need for separate detection and correction circuits, thus reducing overall circuit complexity while maintaining accurate duty ratio correction.
Solution Approach 2:
The charge pump circuit serves multiple functions simultaneously: it acts as both a duty ratio detection mechanism and a correction mechanism. The same circuit components are used for both detecting the duty ratio deviation and generating the corrective control signal, making the circuit universal and reducing the number of dedicated components needed.
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
The proposed solution effectively reduces power consumption and simplifies the circuit design while maintaining accurate duty ratio correction, achieving efficient operation and minimizing energy expenditure.
Implementation Method 1
a first capacitor; and a first charge-discharge control circuit configured to selectively charge or discharge the first capacitor based on the third signal, to generate the first control signal
Data Source
AI summary
A duty ratio correction circuit includes: a buffer circuit configured to generate a second signal based on a first signal, the second signal having a DC component corresponding to a first control signal; a waveform shaping section configured to shape a waveform of the second signal to generate a third signal that is a target of duty ratio correction; a first capacitor; and a first charge-discharge control circuit configured to selectively charge or discharge the first capacitor based on the third signal, to generate the first control signal.