Switching Power Conversion Circuit With Shared Switching Device
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Solution Overview
Problem
Conventional switching power conversion circuits require a complex configuration with multiple components, leading to inefficiencies and increased manufacturing costs due to the independence of capacitive and inductive power conversion circuits.
Innovation Solution
A switching power conversion circuit that integrates capacitive and inductive power conversion using a shared first switching device, with a capacitive power conversion circuit generating an intermediate voltage with a pulse waveform and an inductive power conversion circuit converting this voltage to an output voltage, both controlled by a switching control signal, allowing for a reduced component count and shared circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive and inductive power conversion circuits are configured independently, then each circuit can operate with independent duty ratios and switching frequencies, but the device complexity and manufacturing cost increase due to more components
Solution Approach 1:
The patent merges the capacitive and inductive power conversion circuits by sharing the first switching device between them. The first switching device is controlled by a single duty ratio signal, integrating two previously independent circuits into one unified structure, thereby reducing component count while maintaining power conversion functionality
Solution Approach 2:
The first switching device serves dual functions: it operates as part of the capacitive power conversion circuit to generate intermediate voltage, and simultaneously as part of the inductive power conversion circuit to control inductor current. This multi-functionality reduces the total number of switching devices needed
2Reliability
If multiple switching devices are used in capacitive and inductive power conversion circuits, then the power conversion function is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the switching devices of capacitive and inductive power conversion circuits by making the first switching device common to both circuits. This merging reduces the total component count, directly lowering manufacturing costs while preserving the essential power conversion functions
Solution Approach 2:
The shared first switching device performs multiple functions across different power conversion stages, eliminating the need for separate switching devices in each circuit and thereby reducing overall component requirements and manufacturing expenses
3Adaptability or versatility
If independent switching control signals are used for capacitive and inductive circuits, then flexible voltage conversion is achieved, but the control complexity increases
Solution Approach 1:
The patent combines multiple independent control signals into a single duty ratio signal that controls the shared first switching device. This integration simplifies the control architecture while the circuit topology itself provides the necessary voltage conversion flexibility through the interaction of the capacitive and inductive elements
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 configuration enhances power conversion efficiency and reduces manufacturing costs by simplifying the circuit structure and control complexity, while maintaining flexibility in input and output voltage levels.
Implementation Method 1
a capacitive power conversion circuit including a plurality of switching devices, wherein the plurality of switching devices of the capacitive power conversion circuit are configured to operably switch the conversion capacitor according to a switching control signal, to convert an input voltage to an intermediate voltage
Implementation Method 2
an inductive power conversion circuit including a plurality of switching devices, wherein the plurality of switching devices of the inductive power conversion circuit are configured to operably switch the inductor according to the switching control signal, to convert the intermediate voltage to an output voltage
Data Source
AI summary
A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit includes plural switching devices for generating an intermediate voltage which is in a predetermined proportional relationship to the input voltage. The inductive power conversion circuit includes plural switching devices for converting the intermediate voltage to an output voltage. The plural switching devices of the capacitive power conversion circuit and the inductive power conversion circuit switch the conversion capacitor and the inductor periodically according to the duty ratio of the switching control signal generated by the switching control circuit. The capacitive power conversion circuit and the inductive power conversion circuit share one of the plural switching devices.