5results about How to "Increase boost capacity" patented technology

The present invention relates to a bus and a rear bumper assembly thereof. The rear bumper assembly for a bus includes a rear bumper for forming a rear engine compartment with a door and a cabin, the rear bumper is provided with a leakage hole for connecting the inside and outside of the rear engine compartment, and the rear bumper is provided with a guide structure for guiding the air in the rear engine compartment toward a negative pressure area at the rear of the bus, or the leakage hole itself is provided with a guide structure for guiding the air in the rear engine compartment toward a negative pressure area at the rear of the bus. By providing the leakage hole on the rear bumper, the airflow in the rear engine compartment can be led out backward when the bus is running at high speed, thereby reducing the air pressure resistance caused by the airflow gathering in the rear engine compartment. Since a negative pressure area will be formed at the rear of the bus when the bus is running at high speed, the guide structure can guide the air in the rear engine compartment toward the direction of the negative pressure area, thereby increasing the air pressure value of the negative pressure area and reducing the negative pressure drag.

The invention discloses a high-boost photovoltaic optimizer circuit structure and a control method thereof. The circuit is constructed by combining an interleaved Boost circuit, a switched capacitor circuit and a resonant circuit. Compared with a traditional Boost converter, the boost capability of the circuit is greatly improved; secondly, through introduction of the resonant element, zero-voltage switching-on of part of the switching tubes and zero-current switching-off of part of the diodes are realized, and the efficiency of the circuit is improved; and thirdly, the filter inductor and the resonant inductor are integrated in the transformer, so that the integration level of the circuit is improved.

The invention discloses a mirror image high-gain Boost converter with switch tubes synchronously switched on and switched off, and belongs to the technical field of power electronic direct current conversion. The converter comprises a direct-current voltage source, two inductors, seven capacitors, seven diodes and two MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switching tubes. The core innovation lies in that the two switching tubes are completely and synchronously switched on and switched off, no dead time needs to be set, and the control logic is simplified. Through specific connection and multiplexing of a capacitor and an inductor, an efficient voltage-multiplying unit is formed, extremely high voltage gain is achieved, the gain formula is shown in the specification, and D is the duty ratio of a switching tube. According to the structure, high gain is obtained, meanwhile, the voltage stress of the switching tube is remarkably reduced, the value of the voltage stress is only output voltage, and the switching loss is effectively reduced. The device has the advantages of being small in number of devices, compact in structure, high in efficiency, low in cost and the like, and is particularly suitable for occasions where low input voltage needs to be boosted to high direct current bus voltage in the new energy field of photovoltaic systems, energy storage systems and the like.

The present invention discloses an ejection refrigeration system and a refrigeration device, wherein the ejection refrigeration system comprises a compressor, a condenser, an ejector, a first throttling device, a second throttling device, a first evaporator, a second evaporator, a gas-liquid separator and a circuit switching unit. The condenser is connected to the inlet of the ejector, the outlet of the ejector is connected to the inlet of the gas-liquid separator, and the gas phase outlet of the gas-liquid separator is connected to the inlet of the compressor; the liquid phase outlet of the gas-liquid separator is connected in series with the first throttling device, the first evaporator and the ejection inlet of the ejector to form a first ejection circuit; the liquid phase outlet is connected in series with the second throttling device, the second evaporator and the ejection inlet to form a second ejection circuit. The present invention can avoid the limitation on the size requirement of the ejector nozzle caused by the small flow rate entering the ejection inlet in the prior art, thereby conveniently realizing the processing of the nozzle and reducing the production and manufacturing cost of the ejector.

The application discloses a bipolar self-balancing interleaved coupled inductor high-gain converter for a direct-current microgrid, relates to the field of boost converters, and utilizes the winding ratio boost characteristic of the interleaved coupled inductor and the voltage superposition effect of the multi-stage diode-capacitor voltage doubling network to realize high-gain output and power expansion, adopts the mixed method of the voltage doubling network and the switched capacitor network on the output side to improve the output voltage, and through the organic combination of the interleaved coupled inductor structure and the voltage doubling network and the switched capacitor network, a high boost ratio can be obtained under the condition of a lower duty cycle and a smaller coupled inductor winding ratio, the problems of increased leakage inductance, high magnetic core loss and excessive device stress caused by the dependence of traditional topologies on an extremely high duty cycle or an ultra-large winding ratio are avoided, the boost capability under a wide input voltage range is significantly improved, and the bipolar self-balancing interleaved coupled inductor high-gain converter is suitable for the scene of supplying power from low-voltage new energy such as photovoltaic energy and energy storage to a high-voltage direct-current bus.