Full bridge LLC resonant digital power supply evaluation kit DC-DC converter solution

The STMicroelectronics STEVAL-DPSLLCK1 is a digitally controlled 3kW full-bridge LLC resonant DC-DC converter with output synchronous rectification. The kit comprises of a power board, adapter board, digital control board, and firmware modules. The device is available now from RS Components.

The full-bridge primary section of the LLC converter is based on MDmesh DM2 Power MOSFETs for high-efficiency performance. The PWM switching frequency is digitally controlled to control the output voltage. The converter runs at near-resonant frequencies to maximise efficiency and achieve ZVS over the complete operating range.

The HF transformer provides galvanic isolation and magnetic integration of the inductive elements for a compact design. SR with STripFET F7 Power MOSFETs is used on the secondary side to lessen conduction losses.

The microcontroller on the digital control board embeds a high-resolution timer for finer regulation and is able to communicate status information via USART, CAN, SMBus, and optocoupled serial communication.

Both the primary and secondary sections are provided by an off-line flyback circuit based on VIPer27HD which supplies regulated voltages to the control board, the gate driver ICs and the signal conditioning circuits.

The user can connect a PFC to the power board and extend communication and interfacing with the supplied adapter board.