Offline Synchronous Switching Regulator Eliminating Magnetic Amplifier Loss
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Solution Overview
Problem
Existing offline power regulators face inefficiencies due to power loss in magnetic amplifiers and additional power consumption from devices like saturable inductors and current-sense resistors, which are not adequately addressed by previous solutions.
Innovation Solution
A synchronous switching regulator is developed that integrates a synchronous rectifying circuit with the regulation circuit, eliminating the need for a magnetic amplifier and additional switching stages, using switches and a control circuit to generate pulse signals for efficient power conversion from no load to full load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a magnetic amplifier is used for power regulation, then power conversion capability is provided, but power loss occurs in the diode and saturable inductor
Solution Approach 1:
The patent extracts and removes the magnetic amplifier from the circuit topology, replacing it with a synchronous rectifier circuit that uses active switches instead of passive magnetic components. This elimination of the magnetic amplifier directly addresses the power loss issue while simplifying the overall circuit structure.
Solution Approach 2:
The patent substitutes the magnetic amplifier (a passive magnetic system) with an active electronic switching system comprising synchronous switches, control circuits, and pulse signal generators. This replacement transitions from a magnetic-based regulation mechanism to an electronically controlled switching mechanism, improving efficiency.
2Power
If magnetic amplifier is used for power regulation, then power conversion is achieved, but additional switching stages are required
Solution Approach 1:
The patent merges the power conversion function and the switching control function into a unified synchronous rectifier circuit. The same switching components that perform rectification also perform regulation, eliminating the need for separate switching stages that would be required with a magnetic amplifier topology.
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 solution achieves high efficiency power conversion across the entire load range without additional power consumption, improving upon previous technologies by eliminating the need for magnetic amplifiers and reducing diode power loss.
Implementation Method 1
a power transformer to provide isolation from AC line input to the output of the power supply for safety
Implementation Method 2
switches to switch a transformer and generate a switching signal at the secondary winding of the transformer
Data Source
AI summary
An offline synchronous switching regulator is proposed for improving the efficiency thereof. Switches are coupled to switch a transformer and generate a switching signal at a secondary side of the transformer. A switching circuit is coupled to an output of the regulator to generate pulse signals in response to the switching signal and a feedback signal. Pulse signals are utilized to control a synchronous switch for rectifying and regulating the regulator. The synchronous switch includes a power-switch set and a control circuit. The control circuit receives pulse signals for turning on/off the power-switch set. The power-switch set is connected in between the transformer and the output of the regulator. A flyback switch freewheels an inductor current and can be turned on in response to the off state of the power-switch set whose on-time is correlated to the on-time of the power-switch set.