Switching Power Supply Dynamic Circuit Reconfiguration
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Solution Overview
Problem
Switching power supplies face increased conduction loss when connected to a direct current power supply, which limits the rated output power and efficiency, especially when transitioning from alternating current to direct current power sources.
Innovation Solution
A switching power supply design that uses a switching circuit with conductive members to switch between a dual power factor improvement circuit and an interleaving circuit based on the input power type, reducing conduction loss by changing the connection configuration between non-insulated chopper circuits when switching from alternating current to direct current power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dual voltage boosting circuit is used to improve power factor and suppress harmonic currents when connected to an alternating current power supply, then the power factor is improved and harmonic currents are suppressed, but the conduction loss increases when connected to a direct current power supply
Solution Approach 1:
The patent applies dynamics by making the circuit configuration changeable through a switching circuit that can reconfigure the connection between voltage boosting circuits based on the input power supply type. When AC power is detected, the circuit operates in dual boost mode for power factor improvement; when DC power is detected, it switches to interleaved mode to reduce conduction loss. This dynamic reconfiguration allows the same hardware to optimize performance for different input types.
Solution Approach 2:
The patent changes the circuit topology parameters based on the input power supply type. The switching circuit alters the connection configuration between the voltage boosting circuits - connecting them in a specific arrangement for AC input to achieve power factor correction, and reconfiguring them for DC input to minimize conduction loss. This parameter change in circuit topology resolves the contradiction between power factor improvement and conduction loss reduction.
2Object-generated harmful factors
If the circuit is configured for alternating current power supply with power factor correction, then harmonic currents are suppressed, but the rated output power must be reduced when using direct current power supply due to increased conduction loss
Solution Approach 1:
The switching circuit dynamically reconfigures the circuit topology based on input power type detection. For AC input, it establishes the dual boost configuration that suppresses harmonic currents. For DC input, it switches to the interleaved configuration that minimizes conduction loss and maintains rated output power. This dynamic adaptation allows the circuit to achieve both harmonic suppression and full power output depending on the input source.
Solution Approach 2:
The patent makes the voltage boosting circuit universal by enabling it to perform different functions based on the input power supply type. The same hardware circuit can function as a power factor correction circuit for AC input and as an efficient voltage boosting circuit for DC input. The switching circuit enables this multi-functionality by reconfiguring the connections appropriately for each input type, allowing the device to maintain rated output power regardless of whether AC or DC power is supplied.
Data Source
AI summary
A switching power supply that has a reduced conduction loss, when a direct current power supply is connected as an input power supply, by changing a part of a circuit for alternating current-to-direct current conversion, is provided. The switching power supply includes power input terminals to which the direct current power supply or an alternating current power supply is connected; power output terminals configured to output electric power; a smoothing capacitor connected between the power output terminals; a first non-insulated chopper circuit connected between the power output terminals; a second non-insulated chopper circuit connected between the power output terminals; and a switching circuit configured to switch a connection circuit provided between the first non-insulated chopper circuit and the second non-insulated chopper circuit, and the power input terminals.