UPS Diode Rectifier and Converter for DC Load Power
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Solution Overview
Problem
Existing uninterruptible power supply (UPS) devices face efficiency losses when converting AC power to DC power for DC loads and lack an effective mechanism to collect regenerative power from DC loads.
Innovation Solution
The UPS device includes a DC bus, a converter, a diode rectifier, a DC/DC converter, and switches controlled by a control device to efficiently supply DC power to DC loads and convert regenerative power back to AC, using a diode rectifier during normal operations and the converter as an active filter to suppress harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If AC power is converted to DC power using a converter and then supplied to DC load through an external AC adaptor, then DC load can be powered, but power loss occurs in each conversion stage reducing efficiency
Solution Approach 1:
The patent merges the AC-to-DC conversion function directly into the UPS device by integrating a diode rectifier, eliminating the need for external AC adaptors. This consolidation removes the intermediate conversion stage and reduces cumulative power losses that occur when using separate converter and AC adaptor components.
Solution Approach 2:
The UPS device is designed with multi-functionality to directly supply power to both AC and DC loads. The diode rectifier enables the system to provide DC power output in addition to traditional AC power output, making the device universally applicable to different load types without requiring additional external conversion equipment.
2Loss of energy
If diode rectifier is used to supply DC power directly to DC load, then power loss is reduced, but harmonic current is generated in AC supply
Solution Approach 1:
The patent converts the harmful harmonic current generated by the diode rectifier into a beneficial function by using it for regenerative power collection from DC loads. The harmonic current, which would normally be wasted or harmful, is redirected to charge the storage battery during regenerative braking operations, transforming an adverse effect into a useful energy recovery mechanism.
3Loss of energy
If regenerative power from DC load is collected, then energy efficiency is improved, but mechanism for collecting regenerative power is needed
Solution Approach 1:
The converter in the UPS device performs multiple functions: it serves as the primary AC-to-DC conversion device during normal operation and simultaneously acts as the regenerative power collection mechanism when DC loads generate regenerative power. This multi-functionality eliminates the need for separate dedicated regenerative braking equipment, reducing overall system complexity while enabling energy recovery.
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 efficiency in supplying power to DC loads and effectively collects regenerative power, improving power factor and reducing harmonic influence on the AC supply.
Implementation Method 1
a converter for converting alternating current (AC) power into direct current (DC) power
Implementation Method 2
an inverter for converting DC power into AC power
Implementation Method 3
a diode rectifier connected between the AC power supply and the DC bus
Data Source
AI summary
In an uninterruptible power supply device for supplying DC power to a load, a control device is configured such that, when the load is performing power running operation, the control device turns on a second switch to supply DC power from a diode rectifier to the load, turns off a first switch, and controls a converter to suppress a harmonic current contained in an AC current flowing from an AC power supply to the diode rectifier, and when the load is performing regenerative operation, the control device turns off the second switch, turns on the first switch, and controls the converter to convert regenerative power generated by the load into AC power.