CN111508795B

CN111508795B - Adjustable fuse, fuse assembly and control method

Info

Publication number: CN111508795B
Application number: CN202010325850.4A
Authority: CN
Inventors: 杨漫雪; 黄云; 周家兴
Original assignee: Nanjing Sart Science and Technology Development Co Ltd
Current assignee: Nanjing Sart Science and Technology Development Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2022-07-22
Anticipated expiration: 2040-04-23
Also published as: CN111508795A

Abstract

The invention relates to an adjustable fuse and a fuse component, wherein the adjustable fuse comprises an insulating carrier, a fuse wire fixed on the insulating carrier and a sliding contactor; the sliding contactor is provided with a joint contacted with the fuse wire, and the joint moves back and forth along the length direction of the insulating carrier; thereby changing the length of the fuse wire actually used in the fuse, and thus adjusting the rated current value of the fuse. The current Hall sensor is arranged, the current value of the fuse wire can be detected in real time, the reference is taken as the basis, the joint of the sliding contactor is controlled to move according to the reference, the rated current value of the fuse wire is correspondingly adjusted, and more accurate overcurrent protection effect is provided for the protected electrical equipment. The invention also provides a control method of the fuse assembly.

Description

Adjustable fuse, fuse assembly and control method

Technical Field

The invention belongs to the technical field of electronic devices, and particularly relates to a fuse and an assembly comprising the fuse.

Background

The fuse is a common electrical component and plays a role in protecting a circuit. When a general fuse circuit is overloaded, the fuse element is heated through the fusing current to fuse the fuse element quickly, so that the circuit is disconnected to realize circuit protection. Generally, a fuse has its unique current rating capacity determined by metal components constituting the fuse. Along with the development and the gradual popularization of intelligent equipment, the intelligent equipment uses a large amount of batteries, and the intelligent equipment is convenient to use. Use current fuse through the fuse that generates heat fusing fuse in the smart machine main circuit, sometimes for better protection circuit, need add two or more fuses and parallelly connected use, the fixity of fusing current has simultaneously decided that the protection to equipment is not accurate to cause unnecessary harm to smart machine, prolonged the time of research and development, increased the cost of research and development. However, the fuses in the prior art are all fixed fusing current devices, and need to be manually adjusted to regulate current, and once the fuses are damaged, the fuses cannot be used continuously, and when a plurality of fuses are required in the same circuit, each single fuse needs to be used in parallel, and the use is very inconvenient, for example, if the battery system of the intelligent device is in an over-current state and the fuses are fused, the intelligent device can be in a stagnation state, and resources are wasted. In addition, since a rated current capacity is determined for each fuse, in the case where a rated current required by a smart device to be protected cannot be determined, in order to avoid easy disconnection of a circuit, a fuse of a larger rated current can be mechanically added.

Therefore, a new technical solution is needed to solve the above problems.

Disclosure of Invention

The invention aims to: to solve the above problems, the present invention provides an adjustable fuse capable of adjusting a rated fusing current of a fuse, and at the same time, the fuse can be used after a part of the fuse is fused.

The invention also provides a fuse assembly and a control method, which can adjust the rated fusing current of the fuse by detecting the real-time current value on the fuse wire, thereby providing more accurate overcurrent protection for the protected electrical equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

an adjustable fuse comprises an insulating carrier and a fuse wire fixed on the insulating carrier; the fuse wire extends along the length direction of the insulating carrier; and the sliding contactor is provided with a joint contacted with the fusible link, and the joint moves back and forth along the length direction of the insulation carrier.

Has the beneficial effects that: the adjustable fuse is provided with the sliding contactor, the sliding contactor is used as a connecting point connected with an external circuit, and the connector of the sliding contactor is contacted with the fuse wire at different positions, so that the length of the fuse wire actually used in the fuse is changed, and the rated current value of the fuse is adjusted. The fuse has the advantages that the fuse has a plurality of fusing currents through the sliding contactors, when each fuse is provided with two sliding contactors, the fusing currents can be selected more flexibly and simply, different fusing currents can be selected according to actual application occasions, and the selectivity of the fuse is improved.

The invention also provides a fuse assembly, which adopts the following technical scheme:

the device comprises an adjustable fuse, a control system and a current Hall sensor; the adjustable fuse comprises an insulating carrier, a fuse wire and a sliding contactor, wherein the fuse wire is fixed on the insulating carrier; the fuse wire extends along the length direction of the insulating carrier; the sliding contactor is provided with a joint contacted with the fuse wire, and the joint moves back and forth along the length direction of the insulating carrier;

the current Hall sensor is connected with the fuse wire and used for detecting the current value on the fuse wire, and the output of the current Hall sensor is connected with a current signal processing circuit in the control system; and the joints of the sliding contactor move along the length direction of the insulating carrier to contact with different positions of the fuse wire under the control of the sliding contactor of the control system so as to adjust the fusing current of the fuse wire.

Has the beneficial effects that: the adjustable fuse provided in the fuse assembly is provided with the sliding contactor, and the joints of the sliding contactor are contacted with the fuse wire at different positions, so that the length of the fuse wire actually used in the fuse is changed, and the rated current value of the fuse is adjusted. The current Hall sensor is arranged to detect the current value on the fuse wire in real time and the rated current value of the fuse wire is correspondingly adjusted by controlling the movement of the connector of the sliding contactor according to the current value, so that a more accurate overcurrent protection effect is provided for the protected electrical equipment.

The invention provides a control method of the fuse assembly, which comprises the following steps:

a current value signal detected by the current Hall sensor is transmitted to the control system; and comparing the control system with a preset fusing current value, and when finding that the current value signal does not meet the fusing requirement, controlling the joint of the sliding contactor to slide so that the fusing current reaches the preset fusing requirement.

Further, when including two at least adjustable fuses in the fuse subassembly, set up two adjustable fuses to different fusing current, when adjustable fuse fusing of the same kind, another way adjustable fuse still is in connected state.

Furthermore, when one adjustable fuse is fused, the joints of the sliding contactor are controlled to move to two ends of the unblown fuse wire, so that the adjustable fuse can still be used.

Drawings

Fig. 1 is a schematic structural view of a fuse assembly according to the present invention.

FIG. 2 is a schematic diagram of the component blocks of the control system.

Detailed Description

Example one

Referring to fig. 1, the present embodiment discloses a fuse assembly, which includes an adjustable fuse 100, a control system 200, a current hall sensor 300, and a holder 400 made of an insulating material. The adjustable fuse 100 comprises an insulating carrier 1, a fuse wire 2 fixed on the insulating carrier 1, and a sliding contactor; the fuse 2 extends along the length of the insulating carrier 1. The two ends of the insulating carrier 1 are fixed to the A, B ends of the holder. And in this embodiment the fuse wire 2 is helically wound around the insulating carrier 1. The sliding contactor has a contact with the fuse 2, which moves back and forth along the length of the insulating carrier 1 to make contact with different positions of the fuse 2. The fuse wire 2 is an exposed fuse body, an insulating layer is not added on the outer surface layer, when the fuse wire 2 is wound on the insulating carrier 1, the distance between the fuse wire 2 needs to be matched with the size of a sliding contactor connector, so that the connector always makes effective contact with the fuse wire 2 when moving to be in a conducting state when being electrified. In the present embodiment, the sliding contacts of the adjustable fuse 100 include two sliding contacts, i.e., a first sliding contact 3 and a second sliding contact 4. The contact 5 of the first sliding contact 3 and the contact 6 of the second sliding contact 4 are simultaneously in contact with the fuse wire 2 of the adjustable fuse.

As shown in fig. 2, the control system includes a current signal processing circuit, a system control circuit, and a motion decoding circuit; the current signal processing circuit is connected to the current hall sensor 300 for receiving the current value signal. When current passes through the current hall sensor 300, the current is converted into a dependent signal according to the characteristics of the current hall sensor, and the dependent signal is transmitted to the current signal processing circuit. The motion decoding circuit is connected with the sliding contactor 3 and used for controlling the movement of the contact of the sliding contactor. The system control circuit is used for judging whether the current fusing current value meets a preset fusing requirement or not and sending a command for controlling the movement of the connector to the system control circuit. The current Hall sensor is adopted, so that the detection of each path of current in the fuse is realized, the controllability of the fuse is improved, and the control basis of the fuse is increased.

The current hall sensor 300 is connected with the fuse wire 2 to detect the current value on the fuse wire 2, and the output of the current hall sensor 300 is connected with a current signal processing circuit in the control system; the

contacts

5, 6 of the sliding contactor are moved along the length direction of the insulating carrier 1 at the

contacts

5, 6 of the control system of the sliding contactor to contact different positions of the fuse 2 for adjusting the fusing current of the fuse 2. In the present embodiment, the diameter (cross-sectional area) of the fuse wire is gradually reduced from one end through a calculation formula of the resistance and a relationship with the current, so that the resistance value of the fuse wire is gradually increased, and the portion with the small cross-sectional area is heated to be fused easily after being powered on, that is, the rated currents borne by the portions with different cross-sectional areas are different, so that when the connector is in contact with different positions of the fuse wire 2, the rated current value of the portion of the fuse wire located between the

connectors

5 and 6 after the

connectors

5 and 6 are moved can be adjusted through a rated current change rule formed by the preset resistance value of the fuse wire. Since the first sliding contactor 3 and the second sliding contactor 4 are provided in the present embodiment, when the contact 5 and the contact 6 are used as the connection terminals for connecting the two ends of the fuse circuit, the moving contact 5, the moving contact 6, or both the moving contact 5 and the contact 6 can provide the function of adjusting the rated current of the fuse.

In this embodiment, the assembly is provided with two adjustable fuses 100, and the two adjustable fuses 100 are connected in parallel, and the terminals on the two adjustable fuses 100 are connected to the same terminal. The sliding contacts on each adjustable fuse 100 include two; the first sliding contactor joints of all adjustable fuses are connected with the same terminal C, and the second sliding contactor joints of all adjustable fuses are connected with the same terminal D/E, so that parallel connection is formed. Or the second sliding contact terminal is connected to the terminal D, E, respectively. In other embodiments, the number of the adjustable fuses is not only two, and if the volume of the device allows the number of the adjustable fuse main bodies to be increased, the number of the adjustable fuse main bodies can be increased, so that the adjustable fuse is suitable for different occasions.

Example two

This embodiment is a method for controlling a fuse assembly in the first embodiment, in which: a current value signal detected by the current Hall sensor 300 is transmitted to a control system; and comparing the control system with a preset fusing current value, and when finding that the current value signal does not meet the fusing requirement, controlling the

joints

5 and 6 of the sliding contactor to slide so that the fusing current reaches the preset fusing requirement.

In the first embodiment, when the fuse assembly includes at least two adjustable fuses 100, the two adjustable fuses are set to different fusing currents, and when one adjustable fuse is fused, the other adjustable fuse is still in a connected state, so that the communication of the whole circuit is not interrupted.

And after an adjustable fuse is fused, controlling the

joints

5 and 6 of the sliding contactor to move to the two ends of the unblown fuse wire 2, namely, connecting the unblown complete fuse wire 2 between the

joints

5 and 6 by avoiding the fused part, so that the adjustable fuse can still be used.

EXAMPLE III

The third embodiment provides an adjustable fuse, which is an independent adjustable fuse in the first embodiment, the independent adjustable fuse can be manufactured and used as a product independently, and the contact position of the contact of the sliding contactor and the fuse wire is adjusted manually or automatically, so that different rated fusing currents can be selected. Since the adjustable fuse in this embodiment is identical to the adjustable fuse in the first embodiment, the details are not repeated herein.

In addition, there are many ways to implement the invention, and the above description is only a preferred embodiment of the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims

1. A fuse assembly comprising an adjustable fuse, a control system, a current Hall sensor; the adjustable fuse comprises an insulating carrier, a fuse wire and a sliding contactor, wherein the fuse wire is fixed on the insulating carrier; the fuse wire extends along the length direction of the insulating carrier; the sliding contactor is provided with a joint contacted with the fuse wire, and the joint moves back and forth along the length direction of the insulating carrier;

the current Hall sensor is connected with the fuse wire and used for detecting the current value on the fuse wire, and the output of the current Hall sensor is connected with a current signal processing circuit in the control system; the contact of the sliding contactor moves along the length direction of the insulating carrier at the contact of the sliding contactor of the control system to contact with different positions of the fuse wire so as to adjust the fusing current of the fuse wire;

the adjustable fuse protector comprises at least two adjustable fuse protectors, wherein the at least two adjustable fuse protectors are connected in parallel, and joints on the two adjustable fuse protectors are connected with the same wiring terminal;

the sliding contactors on each adjustable fuse comprise two sliding contactors which are respectively a first sliding contactor and a second sliding contactor, and a joint of the first sliding contactor and a joint of the second sliding contactor in each adjustable fuse are simultaneously contacted with a fuse wire of the adjustable fuse; the first sliding contactor joints of all adjustable fuses are connected with the same terminal, and the second sliding contactor joints of all adjustable fuses are connected with the same terminal.

2. A fuse assembly as recited in claim 1, wherein the fuse wire is helically wound around the insulating carrier and the cross-sectional area of the fuse wire tapers from one end.

3. A fuse assembly as set forth in claim 2, further comprising a holder of insulating material to which the ends of the insulating carrier are secured.

4. The fuse assembly of claim 1, wherein the control system comprises current signal processing circuitry, system control circuitry, motion decoding circuitry; the current signal processing circuit is connected with the current Hall sensor and used for receiving a current value signal; the motion decoding circuit is connected with the sliding contactor and used for controlling the movement of the joint of the sliding contactor; the system control circuit is used for judging whether the current fusing current value meets a preset fusing requirement or not and sending a command for controlling the movement of the connector to the system control circuit.

5. A control method using the fuse assembly of any one of claims 1 to 4, comprising:

6. The method of claim 5, wherein when the fuse assembly includes at least two adjustable fuses, the two adjustable fuses are set to different blowing currents, and when one of the adjustable fuses blows, the other adjustable fuse remains connected.

7. A control method according to claim 5 or 6, characterized in that when an adjustable fuse is blown, the contacts of the sliding contact are controlled to move to the ends of the unblown fuse, so that the adjustable fuse remains usable.