Multi-Winding Power Converter with Voltage Detection and Source Switching
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Solution Overview
Problem
Conventional power conversion devices with complex windings fail to effectively control the distribution of AC input power to multiple outputs and cannot switch power supply sources efficiently, leading to power shortages even when AC input voltage is present.
Innovation Solution
A power conversion device with three or more magnetically coupled windings, including an AC/DC converter, a capacitor for smoothing voltage, and switching circuits for converting between AC and DC, along with a voltage detection unit and operation state determination circuit to manage power supply switching between AC and DC sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bidirectional switch circuit with a diode connected in antiparallel to a switching element is used to control charging, then power distribution control through PWM is enabled, but the diode rectifies the power in bridge form, preventing control of the charge amount to each DC power supply
Solution Approach 1:
The patent removes the antiparallel diode from the bidirectional switch circuit. By extracting this component that causes unwanted rectification, the circuit can properly control the charge amount to each DC power supply while maintaining PWM capability for power distribution control.
Solution Approach 2:
The patent enables dynamic control of power distribution by allowing the bidirectional switch to operate in both charging and discharging modes without the static rectification effect of the diode. This dynamic operation permits flexible adjustment of charge amounts to different DC power supplies based on system requirements.
2Device complexity
If a detection unit only detects AC input voltage presence is used, then simple voltage detection is achieved, but power shortage situations where AC input voltage exists but insufficient power is supplied are not detected
Solution Approach 1:
The patent implements feedback by using the capacitor voltage as an indicator of power supply status. The detection unit monitors whether the capacitor voltage reaches its target value, providing feedback on actual power delivery capability rather than just input voltage presence. This enables detection of power shortage conditions.
Solution Approach 2:
The patent replaces simple voltage presence detection with a more sophisticated detection method that monitors capacitor charging status. By substituting the detection mechanism to observe the effect (capacitor voltage) rather than just the cause (input voltage), the system can reliably identify power shortage situations.
3Adaptability or versatility
If complex windings for a transformer are used to obtain a multioutput power supply configuration, then multiple DC power supplies can be charged from AC power supply, but distribution control for AC input power cannot be performed due to diode rectification
Solution Approach 1:
The patent removes the antiparallel diode from the bidirectional switch circuit in the multioutput configuration. This extraction eliminates the unwanted rectification effect that prevented distribution control, while preserving the transformer's multioutput capability for charging multiple DC power supplies.
Solution Approach 2:
The patent enhances the universality of the bidirectional switch circuit by enabling it to perform both power distribution control and charge amount control functions. The modified circuit can adaptively manage power flow to multiple DC power supplies based on system needs, making the multioutput configuration fully controllable.
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 continuous power supply to loads by detecting power shortages and switching to a capable power source, ensuring reliable power distribution and utilization of available power sources.
Implementation Method 1
a transformer is composed of three or more windings magnetically coupled with each other
Data Source
AI summary
A transformer is composed of three or more windings magnetically coupled. An AC/DC converter (2) for converting AC power of an AC power supply (1), a capacitor (3), and a switching circuit (4) are connected to one winding (6a), and a switching circuit (8) or (30) for power conversion of a DC power supply is connected to at least one of the other windings. Voltage of the capacitor (3) or the AC power supply (1) is detected. On the basis of the detected value thereof, the operation state of each switching circuit (4), (8), (30) is determined by an operation state determination circuit (101). On the basis of a result of the determination, the power supply is switched among the AC power supply (1) and the DC power supplies (11) and (34) by an output switch circuit (103).