DC Bus Power Supply Circuit for Seamless Source Switching
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Solution Overview
Problem
Conventional energy storage devices experience poor power supply control flexibility and low response speed during power source switching, leading to interruptions and poor user experience due to inconsistent power sources.
Innovation Solution
A power supply circuit comprising an AC/DC conversion circuit, DC/DC conversion circuit, BOOST circuit, and BUCK/BOOST circuit, controlled by a main control circuit to manage power distribution among multiple power sources and loads, including photovoltaic modules and battery modules, ensuring seamless power transfer and demand-based operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power source switching is used where one power source is disconnected before another is connected, then power source consistency is maintained, but power supply interruption occurs and response speed decreases
Solution Approach 1:
The patent applies preliminary action by pre-connecting the second power source before disconnecting the first power source. The control unit is configured to connect the second power source to the load in advance, ensuring that the power source switching occurs without interruption. This preliminary connection of the backup power source resolves the contradiction by maintaining power supply consistency while eliminating response time delays.
2Adaptability or versatility
If multiple power sources are connected to multiple loads, then power supply flexibility is improved, but control complexity increases and response speed decreases
Solution Approach 1:
The patent applies universality by designing a single control unit that can manage multiple power sources and multiple loads simultaneously. The control unit is configured to determine power distribution based on power consumption requirements of different loads and output states of different power sources. This multi-functional control approach resolves the contradiction by providing power supply flexibility while avoiding the need for separate control mechanisms for each power source-load pair.
3Productivity
If power distribution is optimized based on demand power and bus voltage, then power supply efficiency is improved, but control complexity increases
Solution Approach 1:
The patent applies feedback by continuously monitoring the bus voltage and power consumption requirements of loads, and using this information to dynamically adjust power distribution. The control unit determines the output state of each power source based on real-time feedback from voltage detection and power demand assessment. This feedback mechanism resolves the contradiction by optimizing power supply efficiency through adaptive control while using a unified control approach that manages complexity.
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
Enhances power supply flexibility and response speed, ensuring consistent power delivery to devices and loads by optimizing power distribution and managing power sources efficiently.
Implementation Method 1
an AC/DC conversion circuit, a DC/DC conversion circuit, a BOOST circuit, and a BUCK/BOOST circuit, where a first end of the AC/DC conversion circuit is configured to connect to a first device
Implementation Method 2
a second end of the AC/DC conversion circuit is connected to a first end of the DC/DC conversion circuit through a DC bus, a second end of the DC/DC conversion circuit is configured to connect to a battery module
Implementation Method 3
an input end of the BOOST circuit is configured to connect to a first photovoltaic module, an output end of the BOOST circuit and a first end of the BUCK/BOOST circuit are commonly connected to the DC bus
Implementation Method 4
a first end of the BUCK/BOOST circuit is connected to the DC bus, and a second end of the BUCK/BOOST circuit is configured to connect to a DC load
Data Source
AI summary
A control method of a power supply circuit is provided. The power supply circuit includes an AC/DC conversion circuit, a DC/DC conversion circuit, a BOOST circuit, and a BUCK/BOOST circuit that are commonly connected to a DC bus, a first device is connected to a first end of the AC/DC conversion circuit, and a DC load is connected to a second end of the BUCK/BOOST circuit. A bus voltage of the DC bus and a photovoltaic output voltage of a first photovoltaic module are obtained, and when the photovoltaic output voltage is greater than a preset input voltage, operating states of the AC/DC conversion circuit, the DC/DC conversion circuit, the BOOST circuit, and the BUCK/BOOST circuit are respectively controlled according to demand power of the first device, demand power of a battery module, demand power of a DC load, and the bus voltage.