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

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.

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.