摘要:
An LLC power converter has an output voltage which is determined by a frequency controller controlling the frequency of an on and off switching of the switches (5, 6) of the converter. In order to stabilize the output voltage at varying output currents, a control circuit feeds back the variation of the total current (I) in the converter to the frequency controller (22, 25) for correcting the frequency of the on and off switching of the switches.
摘要:
An electronic switching device comprises a first bipolar junction transistor (BJT) (2a) adapted to control the flow of current between a pair of switching terminals; a charge recovery circuit coupled to the base of the first BJT (2a) and adapted to establish a supply voltage across a capacitor (5) by storing in the capacitor (5) charge carriers accumulated in the base of the first BJT (2a) during application of a base drive current, the quantity of accumulated charge carriers depending on the base drive current; and a controllable current source (4) adapted to control the base drive current, thereby controlling the supply voltage.
摘要:
A power supply system (1) comprises a power brick (3) which comprises a power converter (30) arranged in a first housing (2). The power converter (30) converts an AC-mains input voltage (VM) into an AC-output voltage (VO) which has a higher frequency than the AC-mains input voltage (VM). A power supply circuit (7) supplies a DC-voltage (PVi) to an application (8). The power supply circuit (7) and the application (8) both being arranged in a second housing (6) mechanically separated from the first housing (2). A cable (5) interconnects the power brick (3) and the power supply circuit (7) to supply the AC-output voltage (VO) to the power supply circuit (7). The power supply circuit (7) comprises a rectifier circuit (RE1, RE2, RE3) which rectifies the AC-output voltage (VO) to supply the DC-voltage (PVi) to the application (8).
摘要:
A switched mode power supply includes an input for receiving an input signal voltage, a flyback converter circuit arrangement and an output for delivering a regulated output signal voltage. The switched mode power supply further includes a boost converter arranged to be operatively combined with the flyback converter, and functioning such that the combined converter operates in a boost mode when the input voltage is above a threshold value, and in a flyback mode when the input voltage is below the threshold value.
摘要:
A half-bridge circuit which is operated as a double down-converter is equipped with a second inductor and power feedback capacitors and diodes. The power factor of the circuit is substantially improved thereby.