36results about How to "Avoid reverse current" patented technology

The direction of flow of purged fuel reactant gas (20) is sensed (38, 39, 44, 53, 54) to ensure it flows outwardly from a fuel cell stack (9) towards the ambient (21). If the purged fuel reactant. gas is not flowing outwardly, a signal (39) causes a controller (26) to open the circuit (35) thereby disconnecting the electrical load (33) from the fuel cell stack.

Known junction boxes set the alignment of the external connection cables of the photovoltaic module, which are rigidly connected with a box lid. In the junction box (01) according to the invention, the box lid (04) can be placed on the box receptacle (03) in two or more different fitting positions, wherein a positive contact (05) and a negative contact (08) in the box receptacle (03) are provided for each fitting position. A positive mating contact (23) and a negative mating contact (24) are arranged in the box lid (04). According to the invention, the contacts (05, 08) and mating contacts (23, 24) are situated in such a way that, in each fitting position of the box lid (04) on the box receptacle (03), the positive mating contact (23) can be electrically contacted with one of the positive contacts (05), and the negative mating contact (24) can be electrically contacted with one of the negative contacts (08). According to the invention, the final fitting position of the box lid (04) on the box receptacle (03) is selected based on a prescribed alignment of the connection cables (30, 32) relative to the photovoltaic module (02). The invention makes it possible to preassemble junction boxes (01) and adjust them to each photovoltaic module (02) by selecting the fitting position, and hence alignment of the connection cables (30, 32).

The invention provides an electronic system. The electronic system comprises a display device and a data processing device, wherein the display device is connected with the data processing device and is provided with an antenna and a metal framework; the data processing device is provided with a coaxial cable extending to the display device; the coaxial cable is coupled with the antenna and feeds a signal in the antenna from the data processing device; and a part of a metal shielding layer of the coaxial cable is stripped and exposed and electrically connected with the metal framework to inhibit reverse current so as to improve the radiation efficiency of the antenna. When the electronic system is implemented, the metal shielding layer and the metal framework are electrically connected through a conductive adhesive tape or in a welding mode.

The invention relates to the technical field of switch time sequence control, in particular to a switch control method and a digital controller, wherein the switch control method is used for a totem pole bridge-free circuit. The switch control method comprises the following steps of obtaining the power supply voltage of a power supply, the load voltage of a load unit and the inductive current of an inductor; respectively calculating the duty ratio M of a main switch tube and a duty ratio N of a synchronous rectifier switching tube according to the power supply voltage, the load voltage and the inductive current; if the sum of M and N is smaller than 1, switching off the synchronous rectifier switching tube. Therefore the reverse current occurring during the light load of the inductive current or the reverse current in a state in a region near the zero-passing point of the net side voltage can be inhibited.

The present invention discloses enabling readily determining which circuit, among a plurality of circuits including an optical source lighting circuit and a power supply circuit, has a failure and repairing the circuits easily in a short period. A liquid crystal television 100 comprising a power supply circuit 24 that produces and outputs various power supply voltages from an inputted commercial AC power supply, a microcomputer 22 that outputs a control signal to a plurality of circuits, respectively, including at least the power supply circuit 24 and an inverter circuit 26 that is driven by a power supply voltage output by the power supply circuit 24 to controls turning on and off of each circuit, is provided with an input terminal 53 for providing a power supply voltage from the outside of the liquid crystal television 100, and an inspection auxiliary circuit 50 connected to the power supply circuit 24 and inverter circuit 26, generating a constant voltage that starts the power supply circuit 24 and inverter circuit 26 when a power supply voltage is provided from the input terminal 53 and outputs the constant voltage as a control signal.