Digital Control Switching Regulator Input Voltage Detection Circuit
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Solution Overview
Problem
Conventional digital control switching regulators face challenges in performing optimum control due to errors in estimated input voltage information, which relies on uncertain inductance values, leading to suboptimal control.
Innovation Solution
A digital control switching regulator with an input voltage detection circuit that accurately detects input voltage using a voltage dividing circuit, comparator section, and control section to generate a digital signal for controller coefficients, eliminating the need for inductance and output current value detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If input voltage is estimated using output voltage and output current detection with inductance values, then control can be performed without additional detection circuits, but measurement precision of input voltage information deteriorates due to uncertainty in inductance values
Solution Approach 1:
The input voltage detection function is segmented into a separate detection circuit module that operates independently from the main control circuit. This module includes voltage dividing means, comparison means, and control means, allowing accurate input voltage detection without relying on inductance value estimation while keeping the overall system architecture modular and manageable.
Solution Approach 2:
A dedicated voltage dividing circuit acts as an intermediary between the input voltage source and the control system. This intermediary circuit directly measures the input voltage through voltage division and comparison, providing accurate measurement data to the control means without requiring estimation through other parameters like output voltage and current.
2Measurement precision
If voltage dividing circuit operates continuously for input voltage detection, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The voltage dividing circuit operates periodically rather than continuously. The control means activates the voltage dividing circuit only at specific timing moments when input voltage detection is required, then deactivates it. This periodic operation maintains measurement capability while significantly reducing power consumption compared to continuous operation.
Solution Approach 2:
The control means intelligently manages the operation timing of the voltage dividing circuit based on system requirements. The circuit serves itself by being activated only when necessary for control decisions, avoiding unnecessary power consumption during periods when detection is not required, thus optimizing the balance between measurement needs and energy efficiency.
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 accurate input voltage information for optimum control, reducing power consumption by cutting off current paths in the voltage dividing circuit during detection and allowing for precise controller coefficient optimization.
Implementation Method 1
a voltage dividing circuit (10) outputting a divided voltage of the input voltage
Implementation Method 2
a comparator section (11) comparing the divided voltage with a first reference voltage and a second reference voltage and outputting comparison signals indicating comparison results
Data Source
AI summary
A digital control switching regulator of the invention ON/OFF-controls switching elements by digital-controlled pulse width modulation signals and converts an input voltage to a desired output voltage. The switching regulator includes an input voltage detection circuit that includes: a voltage dividing circuit outputting a divided voltage of the input voltage; a comparator section comparing the divided voltage of the input voltage with a first reference voltage and a second reference voltage and outputting a first comparison signal and a second comparison signal indicating comparison results; and a control section controlling a dividing ratio of the voltage dividing circuit based on the first comparison signal and the second comparison signal to obtain the predetermined divided voltage, thereby outputting an input voltage digital signal corresponding to the input voltage. The input voltage digital signal controls controller coefficients for use in the digital control.