Power Factor Correction Circuit Dynamic Bias Current Regulation
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Solution Overview
Problem
Conventional power factor correction controlling circuits take a long time to start up and have restricted control response times due to considerations of load and input voltage conditions, leading to potential errors and delayed stabilization.
Innovation Solution
A power factor correction controlling circuit that regulates the amplitude of an applied bias current using a control signal providing circuit, a pulse width modulation signal controlling circuit, and a power factor controlling circuit, which operate without an additional delay circuit, allowing for normal operation and stabilization of the control signal during the start-up period regardless of input voltage and load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay circuit is used to consider load and input voltage conditions, then the power factor correction controlling circuit can operate stably, but the start-up time is prolonged and control response is delayed
Solution Approach 1:
The patent changes the bias current amplitude parameter dynamically during start-up. Initially, a first bias current with a specific amplitude is applied to the error amplifier. When the output voltage reaches a predetermined level, the bias current amplitude is changed to a second level. This parameter change allows the circuit to start up quickly without requiring a delay circuit, resolving the contradiction between stable operation and fast start-up time.
2Device complexity
If the bias current amplitude is not regulated, then the circuit operation is simple, but output overvoltage may occur and control signal stability is compromised
Solution Approach 1:
The patent implements dynamic regulation of the bias current amplitude based on the output voltage level. The bias current amplitude is adjusted from a first level to a second level when the output voltage reaches a predetermined threshold. This dynamic adjustment ensures reliable output voltage control without requiring overly complex circuit configurations, balancing simplicity and reliability.
3Reliability
If the error amplification signal level is forcibly decreased based on load and input voltage conditions, then the power factor correction can be improved, but the control response time is delayed
Solution Approach 1:
The patent applies preliminary action by pre-setting the bias current amplitude to an appropriate level before the start-up process begins. This preliminary configuration allows the error amplifier to operate effectively from the start, improving both power factor correction and control response speed without the need for delayed signal level adjustments.
Data Source
AI summary
A power factor correction controlling circuit includes a control signal providing circuit configured to provide a control signal associated with a feedback signal, the feedback signal being controlled based on a bias signal, a pulse width modulation signal controlling circuit configured to control a pulse width modulation signal based on one of first and second bias signals and a power factor controlling circuit configured to provide a power factor control signal when an amplitude of the pulse width modulation signal reaches that of the power factor control signal. Such a circuit Is able to operate stably, regardless of a load condition and an input voltage condition.