33results about How to "Reliable protection function" patented technology

A circuit interrupting device having a reverse wiring protection function is disclosed. The circuit interrupting device includes a housing having a cover and a base, a mounting plate, and an electrical component mounting member, a pair of input hot and neutral conductors and a pair of output hot and neutral conductors, a differential transformer for detecting a leakage current, a disconnecting mechanism for connecting and disconnecting the output conductors to and from input conductors, and a mechanism for preventing reverse wiring, which includes a coil connected to the input hot and neutral conductors and a moveable piece that moves when the coil is energized. The input and output conductors are electrically connected only when the coil is energized by correctly connecting the power wires to the input conductors of the device. This device thus provides both leakage current protection and reverse wiring protection that protects against incorrect wiring during installation.

Aspects of the invention are directed to a three-level power converter that has, as one phase, a bidirectional switching element connected to the series connection point of a series circuit of a first insulated gate bi-polar transistor ("IGBT") and second IGBT and an intermediate electrode of a direct current power supply. Also included is a fuse connected between the bidirectional switching element and the intermediate electrode of the direct current power supply, and an overcurrent shutdown unit provided in each gate drive circuit of the first and second IGBTs, are provided as protection from a power supply short circuit phenomenon occurring in the event of a short circuit failure of any of the IGBTs or diodes.

A motor starter system and a method for operating same are disclosed. According to an embodiment of the present invention, reliability of a motor protection function during an overcurrent is improved by automatically controlling the on / off state of an electromagnetic contactor using an analog sensor value outputted from an external sensor. In addition, the present invention can receive an external sensor value through a connected upper monitoring device, monitor, in real time, the motor starter state, and transmit a control command for directly controlling the on / off state of the electromagnetic contactor, and thus enables excellent operation, integrated lifetime prediction, and motor load management. Furthermore, the present invention can reduce wiring work and a cost thereof and maximizing the use of space more than when controlling the electromagnetic contactor by using the I / O of a PLC.

The invention discloses a distributed optical fiber temperature measurement power cable, which comprises a metal wire armor layer. At least one temperature measurement optical fiber is inserted into armor steel wires arranged in sequence; the temperature measurement optical fiber comprises a temperature measurement fiber core and an optical fiber wrapping layer wrapping the outer side of the temperature measurement fiber core, a heat conduction layer wraps the optical fiber wrapping layer, the periphery of the heat conduction layer is sleeved with metal outer pipes at intervals, and the spacebetween the heat conduction layer and the metal outer pipes is filled with heat conduction filling paste. The heat-conducting filling paste comprises the following components in percentage by weight:18%-20% of a gelatinizing agent, 3%-5% of an oil separation inhibitor, 1%-2% of an antioxidant, 2%-2.5% of a water absorbent, 0.0015%-0.002% of a defoaming agent and the balance of a heat-conducting oil, wherein the shielding layer is formed by wrapping a heat conduction shielding belt, the heat conduction shielding belt comprises a graphite diaphragm, one side surface of the graphite diaphragm isplated with a metal plating layer, and the other side surface of the graphite diaphragm is provided with a heat conduction adhesive layer. The power cable can accurately monitor the operation condition of the cable in real time.

The invention provides an air conditioner controller and a safety protection circuit thereof. The air conditioner controller includes a central processing unit that outputs an air conditioner control signal, a drive unit that receives the control signal output by the central processing unit to control the operation of an air conditioner motor, and a transmission unit that transmits the central processing unit. The control signal is sent to the safety lock unit of the drive unit, and one output signal of the protection detection unit is directly input to the drive unit of the air conditioner motor, and the drive unit stops driving the air conditioner motor; the other way of the protection signal is sent to the safety lock unit to cut off the central processing unit The drive control signal sent by the unit to the drive unit; and a protection signal is output to the central processing unit to stop sending the drive signal. The air conditioner controller of the present invention can provide various safety protections.

The invention relates to a current foldback circuit of photovoltaic inverters which comprises a main current foldback circuit, an overcurrent protection driving circuit and an overcurrent protection control circuit. The main current foldback circuit is connected with the overcurrent protection control circuit by the output terminals of IT1M, IT2-A and IT2-B; the overcurrent protection control circuit is connected with the overcurrent protection driving circuit by the terminals of IDRV+ and IDRV-; and the overcurrent protection driving circuit is connected with the main current foldback circuit by the terminals of IG and IE. The DC side current sensor IT1 in the main current foldback circuit samples the current in the DC busbar, the AC side current sensor IT2 samples the AC output current,the two sample values are output to the overcurrent protection control circuit which sends out the control signals to the overcurrent protection driving circuit by logistic judgment, the overcurrent protection driving circuit transforms the control signal to the signal for driving an overcurrent protection switching tube IGT1, so as to control on and off of the switching tube IGT1.

The invention discloses a protection method for a fault protection device of a high-energy power supply system. The fault protection device is characterized in that high-voltage ends of two groups of energy storage capacitor banks are respectively connected with a current-limiting element group in series and then connected with a controllable switch and an energy absorption resistor in parallel to be connected to a load; and low-voltage ends of the two groups of energy storage capacitor banks are respectively connected with one current detecting unit in series. By adopting the structure and the method, the fault protection device and the protection method thereof have the advantages of capabilities of reducing the size and the production cost of a high-energy power supply system by replacing a high-grade current limiting element with a small-size low-grade current limiting element, rapid and reliable protection function, wide applicability and favorable economy, simple structure and suitability for large-scale production and reformation.

The invention relates to the technical field of electronic products, and discloses a display screen and a mobile electronic product thereof. The display screen comprises a front shell and a screen assembly which is arranged on the front shell; a protection assembly which is capable of popping up to protect the screen assembly during the falling; the protection assembly comprises a gravity acceleration sensor which is used for detecting the falling state, a protection frame which is arranged around the screen assembly and a driving assembly which is used for driving the protection frame to automatically pop up for protection; and a locking assembly which is used for controlling the protection frame to withdraw or pop up is arranged between the protection frame and the driving assembly. The mobile electronic product comprises a bottom shell, a mainboard battery assembly and the display screen, wherein the mainboard battery assembly is arranged in the bottom shell; the display screen is arranged in the bottom shell and electrically connected with the mainboard battery assembly. The display screen provided in the invention has a protection function and is good in overall aesthetic property, so that the aesthetic property of the mobile electronic product is ensured.