Resonant soft switching: a new option for high-efficiency conversion

Soft switching technology is committed to achieving zero voltage, zero current or near-zero switching loss during the conversion process through reasonable design of switching devices and control strategies to reduce the impact on circuit components and improve the efficiency and stability of the overall system. The main working principles include:

Zero-voltage switching (ZVS): By designing and controlling circuit parameters, the switching device is turned on or off in a zero-voltage state during the switching process, thereby reducing switching losses.

Zero-current switching (ZCS): By adjusting the parameters and control methods of circuit components, the switching action is completed under zero-current conditions, reducing energy loss and heat generation.

Resonant soft switching: Combining resonant circuit and soft switching technology, the voltage or current runs at the resonant frequency during the switching process to reduce switching losses and improve efficiency.

Common soft switching topologies include:

Full-bridge topology: used in systems such as DC-AC inverters to achieve soft switching operation and improve efficiency by controlling the status of the main switch tube and compensation capacitor.

Half-bridge topology: often used in DC-DC converters and DC-AC inverters, using resonant circuits to achieve ZVS or ZCS operation to reduce switching losses.

LLC resonant topology: Combined with LLC resonant circuit and soft switching technology, it is suitable for high-frequency converters and high-power applications to improve efficiency and reduce EMI.

Soft switching technology has many advantages over traditional hard switching technology, including but not limited to the following:

Reduce switching losses: By realizing zero-voltage or zero-current switching, the turn-on and turn-off losses of switching devices are reduced.

Improved system efficiency: Energy loss and heat generation are reduced, thereby improving overall system efficiency and energy utilization.

Reduce electromagnetic interference: Due to the reduction of current or voltage shock during switching, the level of electromagnetic interference (EMI) is reduced.

Enhanced equipment life: Reduces the stress and temperature of the device, extending the service life and reliability of the device.

Soft switching technology has been widely used in many fields, including but not limited to the following fields:

Power electronic converters: widely used in various types of power electronic devices and converters, such as inverters, DC-DC converters, resonant converters, etc.

Electric vehicle charger: It can improve charging efficiency, reduce losses, and protect the battery system.

Solar inverter: It can improve energy conversion efficiency and reduce system losses.

Industrial power equipment: Helps improve stability and efficiency.

Communication power supply system: Application in power supply systems such as communication base stations and data centers can improve system reliability and energy saving effects.