Power Factor Correction Circuit Overvoltage Operation Mode
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Solution Overview
Problem
Conventional power factor correction circuits face challenges in continuing operation during overvoltage conditions, especially when using indirect monitoring of output voltage, which leads to loss of information and potential system shutdown.
Innovation Solution
A power factor correction circuit with a control unit that detects overvoltage conditions and switches to a targeted overvoltage operation mode, where the switching means is repeatedly turned on and off to ensure diode conductivity, allowing continued monitoring and operation of the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect monitoring of output voltage is used to reduce circuit complexity, then device complexity is reduced, but reliability is worsened because the control unit loses information about output voltage during overvoltage conditions
Solution Approach 1:
The control unit dynamically adapts its operation mode based on detected conditions. During normal operation, it uses indirect monitoring to simplify the circuit. When overvoltage is detected, it automatically switches to a targeted switching mode that ensures diode conductivity, allowing it to regain information about output voltage and maintain reliable operation throughout all conditions.
2Object-affected harmful factors
If the control unit switches off automatically during overvoltage to protect the circuit, then safety is improved, but productivity is worsened because the system stops operating and loses output voltage information
Solution Approach 1:
Instead of shutting down during overvoltage, the control unit exploits the overvoltage condition by switching to a targeted mode where the diode is forced conductive. This converts the harmful overvoltage situation into an opportunity to regain information about output voltage and continue operation, thereby protecting the system while maintaining productivity.
Solution Approach 2:
The control unit employs periodic targeted switching during overvoltage conditions, repeatedly turning the switching means on and off to ensure the diode becomes conductive. This periodic action allows the system to continuously sample and regain information about output voltage, enabling continued operation rather than shutting down.
3Measurement precision
If separate circuit means are used to monitor output voltage and coil current, then measurement precision is improved, but device complexity is worsened
Solution Approach 1:
The control unit is designed with multi-functionality, serving both as the control element and as the monitoring element. It integrates the capability to detect both output voltage and coil current within a single unit, eliminating the need for separate dedicated monitoring circuits and reducing the overall number of connections while maintaining measurement precision.
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
Enables the power factor correction circuit to maintain operation and reliably identify when overvoltage conditions can be exited, ensuring continued functionality and safe energy transfer even during overvoltage events.
Implementation Method 1
an inductance or coil supplied with a rectified AC voltage is charged or discharged with an input current by switching on/off a controllable switch
Implementation Method 2
The discharging current of the inductance flows via a diode to the output of the converter
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
For the purpose of power factor correction, an inductor (7) is supplied with an input voltage (Vin), a controllable switch element (13) coupled with the inductor (7) being opened or closed to optionally charge or discharge the inductor (7). The discharge current (lL) of the inductor (7) is supplied to an output (5) via a diode (8). When an overvoltage is detected, the system is switched to overvoltage operation in order to make sure by repeatedly switching the switch element (13) on and off that the diode (8) is conductive.