CN204155893U - A kind of PWM fuse - Google Patents

Abstract

The utility model discloses a fuse for PWM, which comprises an upper conductive mounting block, a ladder fuse, a conductive connecting block, a lower conductive mounting block, and a current-selecting conductive plate. The current-selecting conductive plate is connected to the upper conductive mounting block. A number of threaded holes are provided on the current-selecting conductive plate, and a current-selecting screw is provided in one of the several threaded holes. One end of the current-selecting screw is in contact with the ladder fuse, and the ladder fuse is in contact with the ladder fuse. The current-selecting conductive plates are arranged in parallel, and the lower end of the ladder fuse is connected to the lower conductive mounting block through the conductive connecting block. The fuse wire of the fuse is stepped, and the diameters of different steps are different. The wire and the current selection conductive plate are connected by the current selection screw, and the connection is tight, and there will be no ignition due to poor contact.

Description

A fuse for PWM

technical field

The utility model relates to the technical field of overload protection, in particular to a PWM fuse. the

Background technique

A fuse refers to an electrical appliance that fuses the melt with the heat generated by itself and disconnects the circuit when the current exceeds the specified value. Melting, so as to disconnect the circuit, a current protector made by using this principle, the fuse is widely used in high and low voltage power distribution systems and control systems and electrical equipment, as a short circuit and overcurrent protector, is One of the most commonly used protection devices, fuses are used in multiple places in PWM circuits. Each type of fuse has different specifications and uses different locations. the

Chinese patent CN201220722855.1 discloses a fuse, which includes an insulating tube, a fusible body located in the insulating tube, and metal end caps fitted at both ends of the insulating tube. Tubular end, the end is fitted with a round tubular end cap, the end cap is sleeved on both ends of the insulating tube, the two ends of the square tubular insulating tube are formed into a round tubular end cap, and the melt can pass through Solder is connected to the end cap, which adopts the internal welding type in which the solder is inside the end cap or the external welding type in which the solder is outside the end cap. This utility model is simple to manufacture, and can be easily connected and installed on the circuit board. It has the advantages of both round tube and square tube fuses. Its shortcoming is that the fusing current of the fuse is fixed, the same fuse can only be used in a fixed position in the circuit, and the breakers in different positions cannot be used universally. the

Utility model content

In view of the above problems, the utility model provides a fuse for PWM, the current value of protection can be adjusted, and the application range is wide. the

In order to solve the above problems, the technical solution provided by the utility model is:

A fuse for PWM, characterized in that it includes an upper conductive mounting block, a ladder fuse, a conductive connecting block, a lower conductive mounting block, and a current-selecting conductive plate, and the current-selecting conductive plate is connected to the upper conductive mounting block. A number of threaded holes are provided on the current-selecting conductive plate, and a current-selecting screw is provided in one of the several threaded holes. One end of the current-selecting screw is in contact with the ladder fuse, and the ladder fuse is in contact with the ladder fuse. The current-selecting conductive plates are arranged in parallel, and the lower end of the ladder fuse is connected to the lower conductive mounting block through the conductive connecting block. the

It also includes an upper insulating cover, an insulating tube, and a lower insulating cover. The upper insulating cover and the lower insulating cover are arranged at both ends of the insulating tube to form a closed cavity. The ladder fuse, the conductive connection block, the The current selection conductive plate is arranged in the closed cavity formed by the upper insulating cover, the lower insulating cover and the insulating tube, and the upper conductive mounting block and the lower conductive mounting block respectively pass through the upper insulating cover, The lower insulating cover extends outside the closed cavity. The closed cavity formed by the upper insulating cover, the insulating tube and the lower insulating cover can prevent moisture and dust, and prevent the fuse from melting and splashing. the

It also includes a first insulating fixing block and a second insulating fixing block, the first insulating fixing block is arranged on the upper insulating cover, and the upper end of the ladder fuse is fixed on the upper insulating cover through the first insulating fixing block , the second insulating fixing block is arranged on the lower insulating cover, and the lower end of the current selection conductive plate is fixed on the lower insulating cover through the second insulating fixing block. Fix the ladder fuse and the current-selecting conductive plate to prevent the two from shaking and sparking. the

Compared with the prior art, the utility model has the beneficial effects that: the fuses of the fuses are stepped, the diameters of different steps are different, and the thermal fusing currents used for pairs are also different. The thermal fusing current of the same fuse It is adjustable and can be used in various current protection circuits. The fuse and the current-selection conductive plate are connected by current-selection screws. The connection is tight, and there will be no ignition due to poor contact. the

Description of drawings

Fig. 1 is a front view of the utility model,

Fig. 2 is a side view of the utility model. the

In the figure: 1. Upper conductive mounting block, 2. Upper insulating cover, 3. First insulating fixing block, 4. Insulating tube, 5. Ladder fuse, 6. Conductive connection block, 7. Lower insulating cover, 8. Lower Conductive mounting block, 9, current selection conductive plate, 901, threaded hole, 10, second insulating fixing block, 11, current selection screw. the

Detailed ways

The utility model is described further below:

The current-selection conductive plate 9 is connected to the conductive mounting block 1. Several threaded holes 901 are arranged on the current-selection conductive plate 9. A current-selection screw 11 is arranged in one of the several threaded holes 901. One end of the current-selection screw 11 is fused with the ladder. The wire 5 contacts, the ladder fuse 5 is arranged parallel to the current selection conductive plate 9, the lower end of the ladder fuse 5 is connected to the lower conductive installation block 8 through the conductive connection block 6, and the upper insulating cover 2 and the lower insulating cover 7 are arranged at both ends of the insulating tube 4 A closed cavity is formed, the ladder fuse 5, the conductive connection block 6, and the current selection conductive plate 9 are arranged in the closed cavity formed by the upper insulating cover 2, the lower insulating cover 7 and the insulating tube 4, and the first insulating fixing block 3 is arranged on the upper insulating On the cover 2, the upper end of the ladder fuse 5 is fixed on the upper insulating cover 2 through the first insulating fixing block 3, the second insulating fixing block 10 is arranged on the lower insulating cover 7, and the lower end of the current selection conductive plate 9 passes through the second insulating fixing block 10 is fixed on the lower insulating cover 7, and the upper conductive mounting block 1 and the lower conductive mounting block 8 pass through the upper insulating cover 2 and the lower insulating cover 7 respectively to extend outside the closed cavity. the

During work, the fuse is connected to the circuit, and the current selection screw 11 is screwed into the threaded hole 901 corresponding to the current according to the current size of the protection circuit required by the circuit. the

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents. the

Claims (3)

1. A fuse for PWM, characterized in that: it includes an upper conductive mounting block, a ladder fuse, a conductive connection block, a lower conductive mounting block, and a current-selecting conductive plate, and the current-selecting conductive plate is connected to the upper conductive mounting block , the current selection conductive plate is provided with several threaded holes, one of the several threaded holes is provided with a current selection screw, one end of the current selection screw is in contact with the ladder fuse, and the ladder fuse It is arranged in parallel with the current selection conductive plate, and the lower end of the ladder fuse is connected to the lower conductive installation block through the conductive connection block. the 2. The PWM fuse according to claim 1, further comprising an upper insulating cover, an insulating tube, and a lower insulating cover, the upper insulating cover and the lower insulating cover are arranged at both ends of the insulating tube A closed cavity is formed, the ladder fuse, the conductive connection block, and the current selection conductive plate are arranged in the closed cavity formed by the upper insulating cover, the lower insulating cover and the insulating tube, and the upper conductive The mounting block and the lower conductive mounting block respectively pass through the upper insulating cover and the lower insulating cover and extend out of the closed cavity. the 3. The PWM fuse according to claim 2, further comprising a first insulating fixing block and a second insulating fixing block, the first insulating fixing block is arranged on the upper insulating cover, and the ladder fusing The upper end of the wire is fixed on the upper insulating cover through the first insulating fixing block, the second insulating fixing block is arranged on the lower insulating cover, and the lower end of the current selection conductive plate is fixed through the second insulating The block is fixed on the lower insulating cover. the