Synchronized Power Factor Correcting Current Resonance Converter
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Solution Overview
Problem
In conventional two-stage DC-DC converters, the independent switching operations of the current resonance converter circuit and the power factor correcting converter circuit lead to unstable operations and increased complexity, resulting in noise interference and higher costs due to the need for multiple control circuits.
Innovation Solution
A power factor correcting current resonance converter is designed where the power factor correcting converter circuit operates in synchronization with the current resonance converter circuit, using a single control circuit and eliminating the need for a dedicated control circuit, thereby reducing noise and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current resonance converter circuit and power factor correcting converter circuit operate independently with different control circuits, then each circuit can be optimized for its specific function, but the device complexity increases and operation stability deteriorates due to switching interference
Solution Approach 1:
The patent merges the control functions of the current resonance converter and power factor correcting converter into a single control circuit. The control circuit generates switching signals for both circuits, coordinating their operations to eliminate interference while maintaining functional optimization. This reduces device complexity by eliminating separate control circuits while preserving the adaptive capabilities of each converter stage.
2Reliability
If the power factor correcting converter circuit uses a dedicated control circuit operating independently, then the power factor correction can be precisely controlled, but noise increases and operation becomes unstable due to interfering switching operations
Solution Approach 1:
The patent uses a single control circuit as an intermediary that coordinates the switching operations of both the current resonance converter and power factor correcting converter. By generating synchronized switching signals for both circuits, the control circuit eliminates interfering switching operations that cause noise and instability, while maintaining precise power factor correction control through unified signal generation.
3Adaptability or versatility
If multiple control circuits are used for the current resonance converter and power factor correcting converter, then each circuit can be independently optimized, but the cost increases due to the need for multiple control circuits
Solution Approach 1:
The patent implements a universal control circuit that performs multiple functions: it controls both the current resonance converter and the power factor correcting converter, generates switching signals for both circuits, and coordinates their operations. This multi-functional approach eliminates the need for separate control circuits, reducing manufacturing costs while preserving the ability to optimize each converter stage for its specific function.
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
This configuration stabilizes the operation of the power factor correcting current resonance converter, reduces noise, and improves performance by using a single integrated operation frequency, while minimizing the number of components and costs.
Implementation Method 1
a resonance capacitor Cr and a resonance inductor Lr connected in series
Implementation Method 2
a winding P1 on a primary side of a transformer T... Windings S1 and S2 on a secondary side of the transformer T
Implementation Method 3
a power factor correcting converter circuit 110 which outputs the direct-current voltage Vs from a voltage Vd provided by rectifying a commercial alternating-current power source 120 with a diode bridge DB
Implementation Method 4
a photocoupler PCe (light-emitting diode) which emits light depending on variations in the voltage Vo at the output and a photocoupler PCr (phototransistor) which receives the emitted light
Data Source
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AI summary
To provide a power factor correct current resonance converter in which the interference of switching operation is eliminated between two cascade-connected converter circuits, the power factor correct current resonance converter includes a current resonance converter circuit having switches, a resonance capacitor, a resonance inductor, a transformer, diodes, a smoothing capacitor, and a control circuit. The power factor correct current resonance converter also includes a power factor correct converter circuit having a choke coil, a diode, a smoothing capacitor, and a switch. The switch is turned on or off in response to a voltage produced in a second winding of the transformer. Thus, the switching operation of the power factor correct converter circuit is performed in synchronization with the switching operation of the current resonance converter circuit, so that the interference of the switching operation is eliminated. In addition, since a dedicated control circuit is not required, the cost can be reduced.