Switching Control Circuit Function Setting Using Passive Elements
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Solution Overview
Problem
Existing switching power-supply devices face challenges in miniaturization and cost reduction due to the requirement of dedicated resistors or diodes for function setting, which hinders their miniaturization and cost-effectiveness.
Innovation Solution
A switching control circuit that uses passive elements like resistors and capacitors to perform function setting, eliminating the need for dedicated components by utilizing external terminals for setting threshold voltages and improving power factor correction, allowing for miniaturization and cost reduction without additional dedicated elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated resistors or diodes are used for function setting in the control IC, then the function setting can be performed reliably, but the device size increases and cost increases
Solution Approach 1:
The patent merges the function-setting resistor with the output capacitor by connecting them in series between the output terminal and ground. This combination eliminates the need for a dedicated function-setting resistor, reducing the number of external components while maintaining the threshold voltage setting function. The output capacitor serves dual purposes: output filtering and function setting.
Solution Approach 2:
The output capacitor is given multiple functions: it serves as the output filter capacitor for voltage stabilization and simultaneously as the function-setting element for determining the threshold voltage. This multi-functionality reduces the total component count and simplifies the circuit structure.
2Reliability
If dedicated resistors or diodes are used for function setting in the control IC, then the function setting can be performed reliably, but the manufacturing cost increases
Solution Approach 1:
The patent merges the function-setting resistor with the output capacitor by connecting them in series between the output terminal and ground. This combination eliminates the need for a dedicated function-setting resistor, reducing the number of external components while maintaining the threshold voltage setting function. The output capacitor serves dual purposes: output filtering and function setting.
Solution Approach 2:
The output capacitor is given multiple functions: it serves as the output filter capacitor for voltage stabilization and simultaneously as the function-setting element for determining the threshold voltage. This multi-functionality reduces the total component count and simplifies the circuit structure.
3Manufacturing precision
If multiple external components are used for function setting, then the threshold voltage can be precisely controlled, but the device complexity increases
Solution Approach 1:
The patent merges the function-setting resistor with the output capacitor by connecting them in series between the output terminal and ground. This combination eliminates the need for a dedicated function-setting resistor, reducing the number of external components while maintaining the threshold voltage setting function. The output capacitor serves dual purposes: output filtering and function setting.
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 solution enables miniaturization and cost reduction of switching power-supply devices by using passive elements for function setting, improving power factor correction and allowing for flexible threshold voltage settings, thereby enhancing the efficiency and compactness of the devices.
Implementation Method 1
a passive element, which is connected between the first external terminal and the second external terminal
Implementation Method 2
a passive element, which is connected between the first external terminal and the second external terminal
Data Source
AI summary
Disclosed is a switching control circuit for performing an ON-OFF control of a switching element. The switching control circuit includes a first external terminal; a second external terminal; a passive element connected between the first external terminal and the second external terminal; and a function setting circuit, which performs a function setting based on a constant of the passive element. An electric potential at the first external terminal and an electric potential at the second external terminal are controlled.