7 results about "Circuit protection" patented technology

A telecom circuit protection apparatus includes a housing having at least first and second temperature responsive circuit protection devices, such as a fuse and a thyristor disposed therein. A first metal lead is connected to respective first terminals of the first and second circuit protection devices and is structured and arranged such as to transfer heat freely between the second circuit protection device and the first circuit protection device. A second metal lead is connected to a second terminal of the first device and a third metal lead is connected to a second terminal of the second device. The first, second and third metal leads extend from the housing. Advantageously, the portions of the first, second and third metal leads extending from the housing have reduced cross-sections to reduce heat loss from the apparatus and are formed and made solderable for use as connection points for surface mount connection to the apparatus. To protect multiple service lines, a circuit protector is provided for each of them. In this case, the multiple circuit protectors may advantageously be collocated in a common housing having either a common or separate ground terminal(s).

The invention discloses a drying device for weighing instrument detection and repair. The drying device for weighing instrument detection and repair comprises a drying box top seat, a drying box outershell and a drying box base. A drying box top seat is provided on the upper side of the drying box outer shell, and an exhaust valve is arranged on the upper side of the drying box top seat. The exhaust valve is provided with a thermometer. A box door is arranged at the middle position of the front surface of the drying box outer shell. An observation window is arranged at the middle position ofthe box door. A box door handle is arranged on the left side of the observation window. A heat insulation sealing layer is arranged on an existing drying box, so that seal and heat preservation treatment can be effectively conducted at the fixed connection position between a drying chamber and the box door; a seal ring is arranged inside the box, the seal ring can not only play a sealing role, butalso effectively insulate heat, so that the drying effect is better, and the drying speed is rapier; and the thermometer is arranged to monitor the temperature of the drying box at any time; use safety is guaranteed through a circuit protector, and it is avoided that the equipment works at an overloaded power; and therefore the purpose of safe and efficient use is achieved.

The invention discloses a gynecological traditional Chinese medicine double-function electrotherapy apparatus. The apparatus comprises an electrotherapy chassis, a controller and an electrotherapy box, wherein the electrotherapy chassis is internally provided with a power and a frequency regulator, the top portion of the electrotherapy chassis is provided with foot placement grooves, and the foot placement grooves are internally provided with first electrode patches. The apparatus is provided with a time control switch and the frequency controller, enables medical personnel to control a electrotherapy frequency and time according to health conditions of patients, can be simultaneously applied to gynecology and traditional Chinese medicine treatment, greatly reduces the workload of the medical personnel, at the same time, also solves the problem of providing different types of electrotherapy instruments for different patients due to a single frequency of a conventional electrotherapy apparatus, is also provided with a circuit protection apparatus, enhances the safety of the electrotherapy apparatus, also ensures life safety of users, is also provided with the electrotherapy box, can kill viruses and sterilize a used electrotherapy apparatus, and at the same time, is quite convenient to carry.

The invention discloses a heating control circuit with a short-circuit protection function. The heating control circuit comprises a switching circuit unit, an overcurrent detection unit, a signal extension unit and an overcurrent feedback unit, wherein the first input end of the switching circuit unit is connected with an MCU output control signal, and the second input end of the switching circuit unit is connected with the output end of the overcurrent feedback unit; a sampling resistor of the detection unit is connected in series with the negative electrodes of the heating interface and the temperature sensing interface, and the output end of the detection unit is connected with the input end of the signal extension unit; and the output end of the signal extension unit is connected with the input end of the overcurrent feedback unit. The circuit is good in working effect and safe to use.

The invention relates to a brand-new function-integrated car air-conditioner CAN control system electric control box which can realize air-conditioner electric device control and circuit protection. The integrated car air-conditioner electric control box comprises an electric control box housing, wherein an electric control box cover is arranged on the electric control box housing; extension ends are arranged at the two ends of the electric control box housing; a control element and an insurance component are arranged in the electric control box housing. Compared with the prior art, the integrated electric control box has the advantages that the control element and the insurance component are arranged in the electric control box housing, so that the assembly is convenient, and the structural strength is ensured by adopting the closed box body.

The invention discloses a protection circuit of a power switch tube and a load switch circuit. The protection circuit comprises a current-limiting protection circuit, an under-voltage protection circuit and an under-voltage short-circuit protection circuit, and the under-voltage short-circuit protection circuit is connected between the grid electrode of the power switch tube and the output end of the chip and used for lowering the grid electrode voltage of the power switch tube when the input voltage is under-voltage and the output voltage is smaller than the threshold voltage. Therefore, certain short-circuit protection can be provided for the power switch tube when the input voltage is under-voltage, and the power switch tube is prevented from being damaged when the output end of the chip is short-circuited.