Abstract: A power supply unit supplies power to a load, and the power supply unit includes a power factor corrector, a DC conversion module, and an isolated conversion module. The power factor corrector is plugged into a first main circuit board and converts an AC power into a DC power. The DC conversion module is plugged into the first main circuit board and converts the DC power into a main power. The isolated conversion module includes a bus capacitor, the bus capacitor is coupled to the DC conversion module through a first power copper bar, and coupled to the power factor corrector through a second power copper bar. The first power copper bar and the second power copper bar are arranged on a side opposite to the first main circuit board, and are arranged in parallel with the first main circuit board.

Abstract: A voltage regulator including an amplifier, a start signal generator and a power transistor is provided. The amplifier has a first positive input terminal, a second positive input terminal, and a negative input terminal to receive a start signal, a reference voltage and a feedback voltage respectively. An output terminal of the amplifier generates a driving voltage. The start signal generator is coupled to the first positive input terminal of the amplifier and generates the start signal, which is incremental, during a startup time interval in a voltage bypass mode. The power transistor generates an output voltage according to the driving voltage based on an operating power. In the voltage bypass mode, the reference voltage is equal to the operating power. A soft-start effect can be effectively achieved by the voltage regulator in the voltage bypass mode.

Abstract: A voltage regulator including an amplifier, a start signal generator and a power transistor is provided. The amplifier has a first positive input terminal, a second positive input terminal, and a negative input terminal to receive a start signal, a reference voltage and a feedback voltage respectively. An output terminal of the amplifier generates a driving voltage. The start signal generator is coupled to the first positive input terminal of the amplifier and generates the start signal, which is incremental, during a startup time interval in a voltage bypass mode. The power transistor generates an output voltage according to the driving voltage based on an operating power. In the voltage bypass mode, the reference voltage is equal to the operating power. A soft-start effect can be effectively achieved by the voltage regulator in the voltage bypass mode.

Abstract: A buffer circuit includes a transistor cascode circuit, a latch circuit, a first transistor, a second transistor, and a voltage generator. The transistor cascode circuit is biasing at a first voltage. The latch circuit is biasing at a second voltage, whose voltage level is negative. The first transistor and the second transistor are coupling between the transistor cascode circuit and the latch circuit, and a gate of the first transistor is coupled to a gate of the second transistor. The voltage generator provides a biasing voltage to the gate of the first transistor and adjusts a voltage level of the biasing voltage dynamically according to a voltage level of the second voltage. The biasing voltage is at a first level when the buffer circuit is initially turned on, and the biasing voltage is at a second level when the buffer circuit enters the steady state.

Abstract: A buffer circuit includes a transistor cascode circuit, a latch circuit, a first transistor, a second transistor, and a voltage generator. The transistor cascode circuit is biasing at a first voltage. The latch circuit is biasing at a second voltage, whose voltage level is negative. The first transistor and the second transistor are coupling between the transistor cascode circuit and the latch circuit, and a gate of the first transistor is coupled to a gate of the second transistor. The voltage generator provides a biasing voltage to the gate of the first transistor and adjusts a voltage level of the biasing voltage dynamically according to a voltage level of the second voltage. The biasing voltage is at a first level when the buffer circuit is initially turned on, and the biasing voltage is at a second level when the buffer circuit enters the steady state.