Bidirectional Converter UPS Circuit Simplifies Structure
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Solution Overview
Problem
Existing uninterruptible power supply (UPS) circuits are complex and costly due to the need for separate high-power battery conversion circuits for charging and discharging, which complicates the circuit structure and increases costs.
Innovation Solution
A UPS circuit design that uses a bidirectional selector switch and bidirectional converters to alternately connect an alternating-current power supply or energy storage apparatus, allowing the same converter to handle rectifying, inverting, boosting, and bucking functions, eliminating the need for an extra charger or high-power battery conversion circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate high-power battery conversion circuit is used for charging and discharging in existing UPS circuits, then the energy storage apparatus can be charged and discharged, but the circuit structure becomes complicated and costs increase
Solution Approach 1:
The patent merges the charging circuit and discharging circuit into a single bidirectional converter that can operate in both modes. The converter switches between charging mode (converting AC to DC to charge the battery) and discharging mode (converting DC from the battery to AC for the load), eliminating the need for separate high-power battery conversion circuits while maintaining full charging and discharging functionality
Solution Approach 2:
The bidirectional converter is designed with multi-functionality, serving as both the charging converter and discharging converter. It can bidirectionally convert energy between AC and DC forms, handling both charging the energy storage apparatus and powering the load during power outages, thereby reducing overall circuit complexity
2Reliability
If two independent conversion circuits are used for commercial power and energy storage apparatus, then power supply reliability is improved, but the UPS circuit structure becomes complicated and costs increase
Solution Approach 1:
The patent combines the commercial power conversion path and energy storage apparatus conversion path into a single bidirectional converter system. The converter can selectively connect to either the AC power supply or the battery, and convert between AC and DC as needed, maintaining reliable power supply while simplifying the overall circuit architecture
Solution Approach 2:
The bidirectional converter serves multiple functions: it can convert AC to DC for charging, convert DC to AC for powering the load, and switch between different power sources. This universal converter replaces the need for two independent conversion circuits, reducing complexity while maintaining power supply reliability
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 design simplifies the UPS circuit structure, reduces costs by eliminating the need for additional charger circuits, and enhances energy utilization by allowing the energy storage apparatus to be charged efficiently using the same converter.
Implementation Method 1
an operating status of the first-type bidirectional converter comprises rectifying
Implementation Method 2
an operating status of the first-type bidirectional converter comprises inverting
Implementation Method 3
an operating status of the first-type bidirectional converter comprises boosting
Implementation Method 4
an operating status of the second-type bidirectional converter comprises rectifying
Implementation Method 5
an operating status of the second-type bidirectional converter comprises inverting
Data Source
AI summary
The present invention discloses an uninterruptible power supply circuit, which includes: a bidirectional selector switch, a first-type bidirectional converter, a second-type bidirectional converter, an energy storage apparatus, and a filtering apparatus, and is alternatively connected to an alternating-current power supply and the energy storage apparatus by using the bidirectional selector switch; the first-type bidirectional converter is disposed between the bidirectional selector switch and the filtering apparatus, the second-type bidirectional converter is disposed between the filtering apparatus and a load, and both the first-type bidirectional converter and the second-type bidirectional converter have a function of rectifying or inverting. By using a bidirectional converter and a bidirectional selector switch, alternating-current commercial power, the energy storage apparatus, and a charger required by the energy storage apparatus can share the bidirectional converter; compared with an existing uninterruptible power supply circuit, no extra charger or high-power conversion circuit is required, thereby simplifying a circuit structure of the uninterruptible power supply circuit.