Boost Power Supply Circuit With Segmented Energy Storage
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Solution Overview
Problem
Conventional power supply circuits face challenges with large-sized inductors and capacitors that limit power density and conversion efficiency, while maintaining sufficient holdup time and high conversion efficiency.
Innovation Solution
A power supply circuit design incorporating a power factor correction circuit and a boost conversion circuit with smaller capacitors and inductors, utilizing a first storage capacitor for intermediate voltage storage and a second storage capacitor for output voltage, allowing energy transfer between them to maintain holdup time and reduce hardware size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If large-sized inductor L_pf and capacitor C_bk are used in conventional power supply circuits, then sufficient holdup time of electrical energy is achieved, but power density is limited
Solution Approach 1:
The patent divides the single large capacitor into multiple smaller capacitors (first capacitor, second capacitor, third capacitor, fourth capacitor) distributed across different circuit nodes. This segmentation allows the same total capacitance value to be achieved while reducing the volume of each individual capacitor, thereby increasing power density without compromising holdup time.
Solution Approach 2:
The patent introduces a voltage doubling circuit that operates in a different functional dimension, enabling the system to achieve the same energy storage capability with reduced physical components. The voltage doubling mechanism allows capacitors to be charged to higher voltages, effectively increasing energy density without increasing physical size.
2Duration of action of stationary object
If large-sized inductor L_pf is used in conventional power supply circuits, then sufficient holdup time of electrical energy is achieved, but hardware cost increases
Solution Approach 1:
The patent segments the single large inductor L_pf into multiple smaller inductors (first inductor, second inductor, third inductor) distributed across the PFC circuit. This segmentation reduces the manufacturing cost and size of each individual inductor while maintaining the same total inductance value and energy storage capability.
Solution Approach 2:
The patent changes the operational parameters of the PFC circuit by using multiple smaller inductors with optimized inductance values. This allows the circuit to achieve the same power factor correction performance with reduced hardware cost and improved manufacturability.
3Ease of operation
If conventional bridge circuit with diodes D1 ̃D4 is used, then power factor correction is achieved, but voltage drop limits conversion efficiency
Solution Approach 1:
The patent replaces the conventional diode bridge circuit with a transistor-based switching circuit. This parameter change from passive diode rectification to active transistor switching significantly reduces voltage drop and conduction losses, thereby improving conversion efficiency while maintaining power factor correction functionality.
Solution Approach 2:
The patent substitutes the mechanical/passive diode rectification system with an electronic transistor switching system. This substitution enables more efficient energy transfer by using active switching elements that have lower voltage drops compared to diode forward voltage losses.
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 design achieves reduced hardware cost and increased power density without compromising holdup time or conversion efficiency by using smaller capacitors and inductors, with improved ripple control through transistor switching speed.
Implementation Method 1
The first storage capacitor is used to store a first electrical energy related to the intermediate voltage
Implementation Method 2
The second storage capacitor is connected to the first post-stage diode and is used to store the second electrical energy related to the output voltage
Implementation Method 3
The first front-stage inductor, is connected between the second terminal of the first front-stage transistor and an input end of the PFC circuit
Implementation Method 4
The first post-stage inductor is connected to the first storage capacitor
Data Source
AI summary
A power supply circuit includes a power factor correction (PFC) circuit used to perform a power factor correction to generate an intermediate voltage. The PFC circuit includes a first front-stage transistor and a second front-stage transistor. A first storage capacitor is used to store a first electrical energy related to the intermediate voltage. A boost conversion circuit is connected to the PFC circuit and used to generate an output voltage according to the intermediate voltage. The boost conversion circuit includes a first post-stage inductor, a first post-stage diode and a first post-stage transistor. A second storage capacitor is used to store a second electrical energy related to the output voltage. The capacitance value of the second storage capacitor is less than the capacitance value of the first storage capacitor; the first electrical energy is completely or partially transferred as the second electrical energy.