AC/DC Converting Circuit Startup Time Reduction
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Solution Overview
Problem
Conventional AC/DC converting circuits experience slowed starting speeds due to oscillations in power source voltage between triggered and released voltage levels, requiring unnecessary waiting times before initiating AC voltage detection.
Innovation Solution
The AC/DC converting circuit disables AC voltage detection when the voltage does not reach the start-up level, allowing the power source voltage to stabilize between the released voltage level and a lower voltage, enabling detection only after the voltage remains above the start-up level for a predetermined time, thus reducing oscillations and shortening the starting time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AC/DC power conversion controller continuously detects the AC voltage, then the voltage detection function is maintained, but the power source voltage oscillates between triggered and released levels causing delayed startup
Solution Approach 1:
The patent applies preliminary action by pre-charging the power source voltage to the released level V2 before voltage detection begins. This preliminary voltage preparation eliminates the need for the controller to wait for voltage recovery after each lockout trigger, thereby reducing startup time while maintaining reliable voltage detection functionality.
2Measurement precision
If the power source voltage is allowed to drop to the triggered voltage level V1 for voltage lockout detection, then voltage detection accuracy is improved, but the startup speed is reduced due to waiting time
Solution Approach 1:
The patent pre-charges the power source voltage to the released level V2 before voltage detection starts, so that when voltage drop to V1 occurs, the detection is immediate and accurate without requiring a waiting period for voltage recovery. This maintains measurement precision while eliminating startup delay.
Solution Approach 2:
The patent skips the conventional waiting time period by directly transitioning from voltage lockout trigger to next detection cycle once the AC voltage exceeds the start-up voltage. This rushing through of the detection process maintains accuracy while significantly reducing startup time.
3Stability of the object's composition
If the AC/DC converting circuit waits for the power source voltage to rise to the released voltage level V2 before starting, then stable operation is ensured, but the starting time is extended
Solution Approach 1:
The patent pre-charges the power source voltage to the released level V2 before voltage detection begins, ensuring stable operation conditions are already in place before detection starts. This eliminates the waiting time for voltage recovery while maintaining operational stability throughout the detection process.
Data Source
AI summary
An AC/DC converting circuit and a starting method thereof are provided. An AC detection or a rectified AC voltage detection is disabled when the AC voltage or the rectified AC voltage not up to a start-up voltage is detected, so as to shorten a recovery time of a voltage of a power supply terminal of an AC/DC power conversion controller, and further shorten a starting time of the AC/DC converting circuit.