Abstract: A dual output power supply including: a first power conversion unit for generating a first DC output voltage to drive a first load according to a DC input voltage; a second power conversion unit for generating a second DC output voltage to drive a second load according to the DC input voltage; a switching unit having two channel ends coupled to the first DC output voltage and the second DC output voltage respectively; a load power measurement unit for measuring a sum of power of the first load and the second load; and a digital microcontroller unit coupled to the switching unit and the load power measurement unit for determining a switching signal to drive a control terminal of the switching unit according to the sum of power.

Abstract: A load adaptive power supply including: a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, and controlling an on-resistance thereof during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage according to at least one control signal; a driving circuit unit configured to generate the at least one control signal according to a pulse modulation signal; and a digital microcontroller unit coupled with the driving circuit unit to determine a duty ratio of the pulse modulation signal according to a power of the load to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, thereby increasing a power conversion efficiency of the power supply.

Abstract: A dual output power supply including: a first power conversion unit for generating a first DC output voltage to drive a first load according to a DC input voltage; a second power conversion unit for generating a second DC output voltage to drive a second load according to the DC input voltage; a switching unit having two channel ends coupled to the first DC output voltage and the second DC output voltage respectively; a load power measurement unit for measuring a sum of power of the first load and the second load; and a digital microcontroller unit coupled to the switching unit and the load power measurement unit for determining a switching signal to drive a control terminal of the switching unit according to the sum of power.

Abstract: A load adaptive power supply including: a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, and controlling an on-resistance thereof during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage according to at least one control signal; a driving circuit unit configured to generate the at least one control signal according to a pulse modulation signal; and a digital microcontroller unit coupled with the driving circuit unit to determine a duty ratio of the pulse modulation signal according to a power of the load to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, thereby increasing a power conversion efficiency of the power supply.

Abstract: In a fan noise canceling system, a feedforward signal generated when a fan speed change occurs and a feedback signal read by a sensor are sent to a signal amplifying unit for signal amplification, and the amplified signals are then sent to a signal converting unit for converting into a digital signal. A hybrid controller receives and corrects the digital signals sent thereto, and conducts rapid convergence algorithm to derive a reverse digital signal. The reverse digital signal is sent back to the signal converting unit for converting into a reverse analog signal, which is then sent to the signal amplifying unit for power amplification and generating a control signal to drive a loudspeaker to produce a reverse acoustic wave, which cancels out wave of fan noise to effectively reduce fan noise without adversely affecting the heat dissipation effect of the fan.

Abstract: In a communication machine room wideband noise suppression system, a sensing unit detects a noise source produced by a fan during the operation thereof and generates a noise input signal and a feedback signal, which are sent to a signal amplifying unit for signal amplification. The amplified signals are then sent to a signal converting unit and converted into digital signals. A multi-channel hybrid controller receives the digital signals and makes corrections and conduct rapid convergence algorithm to derive a reverse digital signal, which is sent to the signal converting unit and converted into a reverse analog signal. The reverse analog signal is sent to the signal amplifying unit for power amplification to generate a control signal for driving a loudspeaker unit to produce interfering acoustic wave, so as to cancel out the noise source and achieve the purpose of eliminating wideband noise.

Abstract: In a communication machine room wideband noise suppression system, a sensing unit detects a noise source produced by a fan during the operation thereof and generates a noise input signal and a feedback signal, which are sent to a signal amplifying unit for signal amplification. The amplified signals are then sent to a signal converting unit and converted into digital signals. A multi-channel hybrid controller receives the digital signals and makes corrections and conduct rapid convergence algorithm to derive a reverse digital signal, which is sent to the signal converting unit and converted into a reverse analog signal. The reverse analog signal is sent to the signal amplifying unit for power amplification to generate a control signal for driving a loudspeaker unit to produce interfering acoustic wave, so as to cancel out the noise source and achieve the purpose of eliminating wideband noise.

Abstract: A fan enabling increased wind pressure and air volume includes a driving circuit unit, a signal level unit, a signal amplifying unit, and a microcontroller unit (MCU). The driving circuit unit drives the fan to rotate; the signal level unit receives a current signal from the driving circuit unit and corrects the level of the received current signal, and sends the corrected current signal to the signal amplifying unit; the signal amplifying unit receives and amplifies the corrected current signal, and sends the amplified current signal to the MCU; and the MCU calculates based on the amplified current signal to generate a control signal to the driving circuit unit, so that the driving circuit unit follows the control signal to drive the fan to rotate and produce increased wind pressure and air volume to achieve effective heat dissipation at reduced power consumption.

Abstract: In a fan noise canceling system, a feedforward signal generated when a fan speed change occurs and a feedback signal read by a sensor are sent to a signal amplifying unit for signal amplification, and the amplified signals are then sent to a signal converting unit for converting into a digital signal. A hybrid controller receives and corrects the digital signals sent thereto, and conducts rapid convergence algorithm to derive a reverse digital signal. The reverse digital signal is sent back to the signal converting unit for converting into a reverse analog signal, which is then sent to the signal amplifying unit for power amplification and generating a control signal to drive a loudspeaker to produce a reverse acoustic wave, which cancels out wave of fan noise to effectively reduce fan noise without adversely affecting the heat dissipation effect of the fan.