Power Conversion Apparatus Bargaining Circuit for LPS Compliance
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Solution Overview
Problem
Power conversion circuits require two sets of optical coupling elements, leading to wasted space and additional costs due to non-compliance with limited power source standards.
Innovation Solution
A power conversion apparatus utilizing a transformer circuit, power switch, control circuit, auxiliary coil, and optocoupler, with a bargaining circuit to adjust feedback voltage and duty ratio, eliminating the need for two optocouplers by controlling the optocoupler based on induced and feedback voltages to comply with limited power source standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two sets of optical coupling elements are used for limited power protection, then the power supply compliance is improved, but the circuit space and cost increase
Solution Approach 1:
The patent combines the functions of two separate optocouplers into a single optocoupler by integrating the feedback control mechanism. The bargaining circuit monitors output power and dynamically adjusts the feedback voltage to the control circuit through one optocoupler, eliminating the need for a second dedicated optocoupler for limited power protection while maintaining compliance with LPS standards.
Solution Approach 2:
The single optocoupler in the patent serves multiple functions: it provides both the primary feedback for voltage regulation and the limited power protection function. The bargaining circuit enables this multi-functionality by determining whether to activate the optocoupler based on output power levels, allowing one component to fulfill roles that traditionally required two separate components.
2Reliability
If two sets of optical coupling elements are used for limited power protection, then the power supply compliance is improved, but the cost increases
Solution Approach 1:
The patent merges the limited power protection function with the primary feedback function into a single optocoupler, reducing component count and associated costs. The bargaining circuit implements the protection logic through control signals that adjust the optocoupler's operation, eliminating the need to purchase and install a second optocoupler while maintaining LPS compliance.
Solution Approach 2:
The bargaining circuit performs self-service by autonomously determining when limited power protection is needed and automatically adjusting the feedback voltage to the control circuit through the single optocoupler. This eliminates the need for additional dedicated protection circuitry, reducing both component costs and assembly complexity.
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
Saves circuit space and reduces costs by complying with limited power source standards without the need for two optocouplers, ensuring safe operation and efficient power delivery.
Implementation Method 1
The auxiliary coil is coupled to the control circuit, and senses a current of the primary coil to generate an induced voltage
Implementation Method 2
The optocoupler includes a light emitting diode and a phototransistor. The light emitting diode is coupled to the bargaining circuit, and is controlled by the bargaining circuit to generate a light signal. The phototransistor is coupled to the control circuit, and receives the light signal to generate the feedback voltage
Data Source
AI summary
A power conversion apparatus is provided. A bargaining circuit adjusts a feedback voltage output by an optocoupler to make a control circuit reduce an output voltage of a transformer circuit, and turns off the optocoupler when the output voltage of the transformer circuit is lower than a first setting voltage to increase the feedback voltage. The control circuit executes a limited power operation when the output voltage of the transformer circuit is lower than the first setting voltage and the feedback voltage is higher than a second setting voltage.