Bridge Rectifier Control Unit Reduces Circuit Energy Loss
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Solution Overview
Problem
Conventional bridge rectifier circuits have complex structures and high energy losses due to extra switching operations within the AC cycle and high voltage levels, leading to increased construction costs and energy consumption.
Innovation Solution
A bridge switching circuit with a control unit that detects voltage thresholds to switch on/off the switching sub-circuits only once within an AC cycle, allowing charging to occur in a low voltage environment, thereby reducing energy loss and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional bridge rectifier circuits perform extra switching operations within AC cycle and charging within high voltage cycle, then the circuit can operate, but circuit energy loss increases and construction cost increases
Solution Approach 1:
The patent extracts and eliminates the unnecessary extra switching operations within the AC cycle and the high voltage charging process. By removing these redundant operations, the circuit energy loss is reduced while maintaining the basic rectifier functionality, directly addressing the contradiction between energy efficiency and operational complexity.
Solution Approach 2:
The patent implements preliminary charging of the bridge switch's gate capacitance before the actual switching operation. By pre-charging the gate in a low voltage environment before the high voltage switching event, the energy loss during switching is significantly reduced, and the circuit structure is simplified by eliminating the need for complex high voltage charging circuits.
2Ease of operation
If bridge rectifier applies external signal to drive bridge switch gate, then switching control is achieved, but circuit structure becomes complicated and construction cost increases
Solution Approach 1:
The patent enables the bridge rectifier circuit to self-control the switching operations using the inherent voltage characteristics of the AC input. The circuit automatically detects voltage thresholds and triggers switching without requiring external control signals, thereby simplifying the overall circuit structure while maintaining ease of operation.
Solution Approach 2:
The patent merges the voltage detection function and the gate driving function into a single integrated process. The same voltage threshold detection mechanism that controls the switching also automatically provides the gate drive signal, eliminating the need for separate external control circuits and reducing structural complexity.
3Power
If ultrahigh voltage process is applied for controller with extra high voltage level shift circuits, then high voltage control is achieved, but circuit energy loss increases
Solution Approach 1:
The patent introduces a low voltage charging capacitor as an intermediary element that mediates between the low voltage control circuitry and the high voltage switching environment. This intermediary allows the controller to operate at low voltage with minimal energy loss while still achieving the necessary high voltage control capability through the capacitor's charging and discharging cycles.
Data Source
AI summary
A power conversion system includes a bridge switch circuit. The bridge switch circuit includes a plurality of switch sub-circuits, each switch sub-circuit includes: a switch for controlling switching of the switch sub-circuit; and a control unit configured to perform the following control cycle: When the voltage between the switch and the cathode is less than the first voltage threshold and the switch sub-circuit is not charged, the control unit controls the switch to be turned on, and starts charging the switch sub-circuit. When the voltage between the switch and the cathode is greater than a second voltage threshold, the control unit controls the switch to be turned off. When the charging voltage of the control unit is greater than the third voltage threshold, the control unit stops charging the switch sub-circuit. The circuit structure is simple and the circuit energy loss of the bridge rectifier is reduced.