Abstract: Provided are a glycosyltransferase UGT76G1 mutant, an isolated polynucleotide, a carrier, a production method, and a composition and a kit for the glycosylation of substrates. Further provided are a method for increasing the catalytic activity of the glycosyltransferase UGT76G1 mutant, and a method for promoting the glycosylation of flavone compounds and the use thereof. The glycosyltransferase UGT76G1 mutant is subjected to mutations at positions corresponding to positions 87, 199, 204 or 379 of SEQ ID NO: 1, and significantly improves the transformation activity of substrates of the flavone compounds.

Abstract: Provided are a mutant glycosyltransferase UGT76G1 and a use therefor, the catalytic activity, the substrate selectivity, and/or the substrate specificity of the mutant glycosyltransferase UGT76G1 having been changed. Mutation at specific points can promote the catalytic activity for 1,3-glycosylation of a substrate containing 1,2-diglucosyl (sophorosyl), and weaken the catalytic activity thereof to perform 1,3-glycosylation on a glucose monosaccharide substrate base. Also provided are mutations that weaken the catalytic activity of glycosyltransferase UGT76G1, able to increase accumulation of a specific stevioside intermediate.

Abstract: The disclosure provides an engineering bacterium for ferulic acid production, a preparation method of the bacterium and use thereof. The invention provides an engineering bacterium that can efficiently produce ferulic compounds by expressing a series of heterologous enzymes in a host cell through gene recombination technology. The expression system constructed by the invention has low metabolic background, strong heterologous expression ability and low cost. The system can synthesize the end product through relatively simple steps, and provide a new way for the industrial production of ferulic acid, intermediates or derivatives thereof.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads. The power supply system also includes a storage battery and an alternating current electric equipment group.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads. The power supply system is a flexible power supply system and includes the oil engine and a plurality of loads.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads. The power supply system also includes a storage battery and an alternating current electric equipment group.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads. The power supply system also includes a plurality of loads and at least one storage battery pack.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads. The power supply system is a flexible power supply system and includes the oil engine and a plurality of loads.

Abstract: A power supply system and method includes a power grid input unit and a diesel generator input unit, separately used for supplying an alternating current to a power supply unit. An automatic transfer switch unit is connected to the power grid input unit and the power supply unit or connected to the diesel generator input unit and the power supply unit, which is used for converting the received alternating current into a direct current. A control unit, which is used for monitoring a current load current and current diesel generator power, determines when to turn off a preset number of power supply loads according to a magnitude relationship between the current diesel generator power and the current load power, as well as according to priority levels of current loads.

Abstract: An automatic equalization method and apparatus for bus bar voltages of a Power Factor Correction (PFC) circuit. The method includes calculating a difference in voltages of a positive bus bar and a negative bus bar, and increasing the rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar until the voltages of the positive and negative bus bars are equalized. The apparatus includes a voltage difference module configured to calculate a difference in voltages of a positive bus bar and a negative bus bar, and a rotation speed control module configured to increase a rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar, until the voltages of the positive and negative bus bars are equalized.

Abstract: The present invention relates to a feedback device for a power supply, including a main feedback module, an auxiliary feedback module and a feedback control module. The main feedback module is adapted to sample a voltage on a main output branch of the power supply, and output a main feedback voltage to the feedback control module. The auxiliary feedback module is adapted to reduce the main feedback voltage when a voltage on an auxiliary output branch of the power supply drops. The feedback control module is adapted to control the power supply to increase its power output when the main feedback voltage decreases, so that the voltage on the auxiliary output branch is restored to normal. By using the power supply feedback device of the present invention, the circuit is simple, not only solving voltage sag problems, but also ensuring the power density and cost.

Abstract: The present invention relates to a power output discharge circuit including: an output filter module configured to receive and filter an input voltage and to output the filtered output voltage to a load; an output charge module configured to charge the output filter module when a power source module is plugged into a system cabinet; and an output discharge module configured to cooperate with the output charge module to discharge the output filter module when the power source module is pulled out of the system cabinet. With an implementation of the power output discharge circuit according to the invention, whether the power source module is pulled out of the system cabinet can be monitored in real time, and upon detecting the power source module being pulled out of the system cabinet, the output discharge module can be started rapidly, and the voltage across the output port can be lowered below a safety voltage in a very short period of time.

Abstract: An automatic equalization method and apparatus for bus bar voltages of a Power Factor Correction (PFC) circuit. The method includes calculating a difference in voltages of a positive bus bar and a negative bus bar, and increasing the rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar until the voltages of the positive and negative bus bars are equalized. The apparatus includes a voltage difference module configured to calculate a difference in voltages of a positive bus bar and a negative bus bar, and a rotation speed control module configured to increase a rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar, until the voltages of the positive and negative bus bars are equalized.

Abstract: The present invention relates to a power output discharge circuit including: an output filter module configured to receive and filter an input voltage and to output the filtered output voltage to a load; an output charge module configured to charge the output filter module when a power source module is plugged into a system cabinet; and an output discharge module configured to cooperate with the output charge module to discharge the output filter module when the power source module is pulled out of the system cabinet. With an implementation of the power output discharge circuit according to the invention, whether the power source module is pulled out of the system cabinet can be monitored in real time, and upon detecting the power source module being pulled out of the system cabinet, the output discharge module can be started rapidly, and the voltage across the output port can be lowered below a safety voltage in a very short period of time.

Abstract: The present invention relates to a feedback device for a power supply, including a main feedback module, an auxiliary feedback module and a feedback control module. The main feedback module is adapted to sample a voltage on a main output branch of the power supply, and output a main feedback voltage to the feedback control module. The auxiliary feedback module is adapted to reduce the main feedback voltage when a voltage on an auxiliary output branch of the power supply drops. The feedback control module is adapted to control the power supply to increase its power output when the main feedback voltage decreases, so that the voltage on the auxiliary output branch is restored to normal. By using the power supply feedback device of the present invention, the circuit is simple, not only solving voltage sag problems, but also ensuring the power density and cost.