47results about How to "Guaranteed output efficiency" patented technology

The embodiment of the invention discloses an operational amplifier circuit and an overcurrent protection method thereof. The operational amplifier circuit comprises: a control unit used for generatingan output control signal according to an input signal and an output signal; an output unit used for generating output current under the action of the output control signal, wherein the output unit comprises an output capacitor, and the output capacitor is charged or discharged by the output current to generate the output signal; and an overcurrent protection unit used for obtaining temperature control current according to the working temperature of the operational amplifier circuit, wherein when the working temperature is greater than or equal to a set temperature, the temperature control current is positively correlated with the working temperature, and the overcurrent protection unit adjusts the output control signal according to the temperature control current to limit the output current. According to the operational amplifier circuit disclosed by the invention, the temperature control current is obtained by detecting the working temperature, when the working temperature is withina reasonable range, the output efficiency, the response speed and the driving capability of the operational amplifier circuit are ensured, and when the working temperature is too high, the output current is limited according to the temperature control current to reduce the circuit power consumption and the working temperature.

The invention discloses a radio frequency power amplifier and an ultra-high frequency radio frequency identification tag for amplitude modulation. The amplifier includes an input matching module, a first-stage amplification module, an inter-stage matching module, a second-stage amplification module, and an output matching module connected in sequence. Matching module, the input matching module is used to match the input signal to the first-stage amplifying module, the inter-stage matching module is used to match the output of the first-stage amplifying module to the input of the second-stage amplifying module, and the output matching module is used to connect the antenna The impedance of the second-stage amplification module is matched to the required output impedance of the second-stage amplification module; the second-stage amplification module is used to provide variable gain, and the second-stage amplification module includes a second inductor and at least two controllable power branches, each controllable The power branches are connected in parallel with each other and then connected in series with the inductor. Even in the case of low output power, the present invention can realize high energy utilization efficiency, thereby ensuring high efficiency.

The invention discloses an optimization system and method for balancing system output efficiency and NOx emission of an SOFC system. The system comprises an SOFC electric pile, a combustion chamber, an air blower, a bypass valve, a heat exchanger and a nitrogen and oxygen sensor based on an SOFC principle. The method comprises the following steps: establishing a relationship among thermal characteristic parameters, system output efficiency, NOx content and system operation variables to obtain a solution set which meets thermal stability requirements and has the highest system output efficiencyand the lowest NOx content, and screening out an optimal system operation variable for balancing the system output efficiency and NOx emission of the SOFC system from the solution set. When the system operates stably, certain system output efficiency can be guaranteed, NOx emission is reduced as much as possible, and environmental friendliness is achieved.

An apparatus to ultrasonically strip graphite oxide comprises an ultrasonic reactor; the top of the ultrasonic reactor is provided with a through hole; a rotary rod is passed through the through hole;the rotary rod is hollow; the upper end of the rotary rod is positioned outside the through hole; the rotary rod is fixedly connected with the inner wall of the through hole through a bearing; the lower end of the rotary rod is fixedly fitted with a stirring head in arc shape; an ultrasonic vibrator is fixedly mounted on one side of the inside of the ultrasonic reactor; a housing is arranged below the ultrasonic reactor; the ultrasonic reactor is arranged inside the housing; the outer wall of the ultrasonic reactor is fixedly connected with the inner wall of the housing through a plurality ofsupport rods; the lower end of the housing is fixedly fitted with a discharge pipe; the upper end of the discharge pipe is passed through the housing and is fixedly connected with the lower end of the ultrasonic reactor; the discharge pipe is communicated with the inside of the ultrasonic reactor; a valve is fixedly mounted on the discharge pipe. The apparatus is simple in structure, reasonable in design and simple to operate, and allows materials to be mixed quickly so that working efficiency is improved.