Boost Power Supply Circuit With Split Capacitor Energy Transfer
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Solution Overview
Problem
Existing power supply circuits face challenges in reducing size and hardware cost while maintaining holdup time and improving conversion efficiency and power density, primarily due to the large size of inductors and capacitors in the PFC and boost conversion circuits.
Innovation Solution
The proposed power supply circuit incorporates a PFC circuit, a first storage capacitor, and a boost conversion circuit with a first post-stage inductor, diode, and transistor. The second storage capacitor has a lower capacitance value than the first, allowing for the transfer of electrical energy from the first to the second capacitor, thereby reducing the size of the first capacitor without compromising holdup time.
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 the PFC circuit, then the holdup time of electrical energy is sufficient, but the power density is limited and the size is large
Solution Approach 1:
The patent divides the single large capacitor C_bk into multiple smaller capacitors (first capacitor, second capacitor, third capacitor, fourth capacitor) with individual capacitances. This segmentation allows the total capacitance to be distributed across multiple smaller components, reducing the volume of each individual component while maintaining the total energy storage capacity required for holdup time.
Solution Approach 2:
The patent combines multiple smaller capacitors in a parallel configuration to achieve the total capacitance equivalent to a single large capacitor. By merging multiple smaller units, the system maintains the required energy storage capacity while reducing the overall volume and improving power density.
2Duration of action of stationary object
If large-sized inductor L_pf and capacitor C_bk are used in the PFC circuit, then the holdup time of electrical energy is sufficient, but the power density is limited
Solution Approach 1:
The patent segments the large capacitor into multiple smaller capacitors, which reduces the volume occupied by energy storage components. This segmentation increases the proportion of active power-converting components relative to passive energy storage components, thereby improving power density while maintaining sufficient holdup time through the combined capacitance of all smaller capacitors.
3Reliability
If conventional PFC circuit with bridge circuit is used, then the power factor correction is achieved, but the voltage drop of diodes limits the conversion efficiency
Solution Approach 1:
The patent changes the circuit topology from a conventional bridge circuit with diodes to a circuit using transistors as switching elements. This parameter change in the type of active component allows for controlled switching with lower voltage drops, improving conversion efficiency while maintaining power factor correction functionality through the coordinated operation of multiple transistors and capacitors.
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 reduces the size and hardware cost of the power supply circuit while maintaining holdup time and enhancing conversion efficiency and power density, as the smaller capacitors and inductors increase power density and reduce costs.
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 post-stage inductor is connected to the first storage capacitor
Data Source
AI summary
A power supply circuit is provided. The power factor correction (PFC) circuit is used to perform a power factor correction according to a first voltage to generate an intermediate voltage. The first storage capacitor is used to store a first electrical energy related to the intermediate voltage. The 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. The 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.