Autonomous Output Discharge Circuit for Low-Standby Power Supplies
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Solution Overview
Problem
Conventional power supply systems incur additional loss in standby mode due to the need for a comparator that relies on an additional power supply and reference voltage, increasing component count and energy consumption.
Innovation Solution
A power supply system with a discharge circuit that includes a capacitor, comparison circuit, and switch circuit, allowing autonomous discharge without additional power or control by precharging the capacitor during power-on to use its voltage as a basis for discharge during power-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional comparator is used in the discharge circuit, then the discharge function can be achieved, but additional power supply and reference voltage are required, increasing power loss during standby mode
Solution Approach 1:
The patent extracts and eliminates the conventional comparator component from the discharge circuit, removing the need for additional power supply and reference voltage inputs. This extraction directly reduces power loss during standby mode while simplifying the overall circuit structure.
Solution Approach 2:
The discharge circuit is designed to operate autonomously without requiring external power supply or control signals during standby mode. The circuit uses the existing output voltage and capacitor voltage to automatically control the discharge switch, making the system self-sufficient and eliminating additional power consumption.
2Device complexity
If a conventional comparator with additional power supply is used, then comparison function is achieved, but the number of components increases
Solution Approach 1:
The patent merges the comparison function with the existing discharge circuit components. The output voltage and capacitor voltage are directly compared through the switch circuit without requiring a separate comparator component, thereby reducing component count while maintaining the comparison functionality.
Solution Approach 2:
The discharge circuit components are designed to serve multiple functions: the switch circuit performs both switching and comparison operations, and the capacitor serves both energy storage and voltage reference purposes. This multi-functionality reduces the need for additional dedicated components.
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
The system reduces power loss during standby by eliminating the need for additional power and control components, enhancing operational efficiency.
Implementation Method 1
The discharge circuit includes a capacitor, a comparison circuit, and a switch circuit. The capacitor is coupled between the detection end and the reference ground.
Data Source
AI summary
A power supply system and operating method thereof are provided. The power supply system includes a power generation circuit and a discharge circuit. The power generation circuit is configured to provide an output voltage at an output end when a power is started, and stop providing the output voltage when the power is off. The discharge circuit includes a capacitor, a comparison circuit, and a switch circuit. The comparison circuit is configured to compare a voltage at a detection end and the output voltage at the output end to generate a comparison result. The switch circuit is configured to discharge the output end according to the comparison result when the power is off. The power supply system and an operating method thereof provided by the disclosure can reduce loss when the power is off, so as to improve the operation quality of the circuit.