AC Input Capacitor Discharge Control for Standby Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switch-mode power conversion systems consume excessive power due to the use of AC input resistors for discharging capacitors, leading to high standby power consumption, as the resistance of these resistors must be low to efficiently discharge capacitors within a short time frame, thereby increasing power consumption.
Innovation Solution
The implementation of a system with automatic detection and discharge control using a signal detector and discharge control component, which eliminates the need for AC input resistors by automatically detecting the disconnection of AC power and discharging the capacitor through diodes and internal controller components, reducing resistance values and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If AC input resistors are used to discharge the AC input capacitor, then the capacitor discharge time is reduced, but the standby power consumption increases
Solution Approach 1:
The patent applies dynamics by making the discharge resistance variable rather than fixed. The controller dynamically adjusts the discharge resistance based on whether AC power is detected: using a first resistance value when AC power is present and a second, lower resistance value when AC power is disconnected. This dynamic adjustment allows the system to achieve fast discharge when needed while minimizing power consumption during normal operation, directly resolving the contradiction between discharge speed and standby power consumption.
Solution Approach 2:
The patent changes the resistance parameter of the discharge path based on operating conditions. By switching between two distinct resistance values (first resistance value during AC power presence, second resistance value after disconnection), the system optimizes both discharge performance and power efficiency. This parameter change strategy enables the system to meet safety requirements for capacitor discharge while minimizing unnecessary power consumption during standby.
2Speed
If low resistance values are used in AC input resistors for efficient capacitor discharge, then discharge speed increases, but power consumption increases
Solution Approach 1:
The discharge resistance is made dynamic, switching between a higher first resistance value during AC power operation and a lower second resistance value after disconnection. This dynamic adjustment ensures fast discharge capability when needed (using the lower resistance value temporarily) while minimizing power consumption during normal operation (using the higher resistance value), thereby resolving the contradiction between discharge speed and power consumption.
Solution Approach 2:
The system employs periodic detection of AC power status and相应调整 discharge resistance. The controller periodically checks for AC power presence and switches resistance values accordingly, enabling the system to achieve efficient discharge only when necessary while maintaining low power consumption during extended periods of normal operation.
Data Source
AI summary
System and method for discharging a capacitor. An example system includes a signal detector and a discharge control component. The signal detector is configured to receive an input signal and generate a detection signal based on at least information associated with the input signal, the input signal being associated with an alternate current signal received by a capacitor including a first capacitor terminal and a second capacitor terminal. The discharge control component configured to receive at least the detection signal and generate an output signal to discharge the capacitor if the detection signal satisfies one or more conditions.