An emergency power supply anti-short circuit protection system

Abstract

The invention discloses an emergency power supply short-circuit protection system, which comprises: first and second photocouplers, voltage-stabilizing diodes, switching diodes, capacitors, thyristors, light touch switches, first to third light-emitting diodes, resistors R1, R2, R3, R4, R5; a charging switch is composed of thyristor; a capacitor, a light touch switch and the first photocoupler are connected in series to form an external backup battery to provide on-off control of the trigger voltage path for the thyristor, the first The on-off of a photoelectric coupler is controlled by the car battery; only when the external backup battery and the car battery are both connected to the short-circuit protection system in the forward direction, the tact switch is operated, the thyristor is turned on, and the external backup battery charges the car battery, realizing battery protection. In the process of clamping the battery, there will be no ignition; in other cases, the thyristor is turned off, and it has nothing to do with whether the tact switch is operated; when the battery clip is removed during charging, the thyristor will be turned off immediately, and there is no need to put the battery clip on and off. The inner side of the splint is divided into contacts that are not in contact with each other at ordinary times, and a single lead wire is used.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to an anti-short circuit protection system for emergency power supplies. Background technique [0002] With the progress of society, more and more people own private cars, but improper use often leads to many problems, such as forgetting to turn off the car lights when leaving, or forgetting to turn off the on-board electronic equipment. It is easy to have insufficient power, and when starting the vehicle next time, the power used is also provided by the battery. When the battery power is insufficient, the car will fail to start. Start to provide power. However, because both the car battery (vehicle battery) and the emergency start power supply have the characteristics of generating instantaneous large current, if the emergency start power supply is used as the car start power supply, if a short circuit or reverse connection occurs due to carelessness, an upper current may be generate...

AI Technical Summary

Problems solved by technology

[0002] With the progress of society, more and more people own private cars, but improper use often leads to many problems, such as forgetting to turn off the car lights when leaving, or forgetting to turn off the on-board electronic equipment. It is easy to have insufficient power, and when starting the vehicle next time, the power used is also provided by the battery. When the battery power is insufficient, the car will fail to start. Start to provide power

However, because both the car battery (vehicle battery) and the emergency start power supply have the characteristics of generating instantaneous large current, if the emergency start power supply is used as the car start power supply, if a short circuit or reverse connection occurs due to carelessness, an upper current may be generated instantaneously. The high current of 1,000 amperes will not only cause damage to the emergency starting power supply, but may even cause a fire or cause injury to the user.

[0003] For this reason, many manufacturers have begun to study anti-reverse connection and short-circuit circuits on the emergency starting power supply of automobiles. For example, the patent application number is: 200520054634.1 discloses a multifunctional starting power supply for automobiles. The anti-reverse connection short-circuit protection circuit connected between the relays controls the current path specifically. As we all know, the emergency starting power supply and the vehicle-mounted battery have the characteristics of generating instantaneous large currents, so the relay must use a large relay, so there is an anti-corrosion protection circuit composed of relays. The defect that the reverse connection short circuit protection circuit is relatively bulky; because the current path is opened immediately when the battery on the vehicle is correctly connected, there is a defect that ignition occurs when the battery is clipped to the battery on the vehicle, although there is a light touch switch to start The emergency starting power supply is only used for removing the battery on the vehicle; in order to disconnect the emergency starting power supply to the current path of the battery clamp after taking out the battery clip from the working point of the vehicle, there are respectively set on the inside of the upper and lower splints of the battery clamp Usually do not touch each other, and lead wires to the anti-reverse short-circuit protection circuit separately, so there is a defect that the battery clip cannot use a single lead wire to the anti-reverse short-circuit protection circuit

[0004] Nowadays, the advancement of buried batteries has led to its wide-scale use. Using buried batteries as emergency start-up power has become a common practice in the industry, and the anti-reverse short-circuit protection circuit that uses relays to form the current path of emergency start-up power is too bulky and cumbersome. The emergency start power is often used as a 12V18AH lead-acid maintenance-free battery. The whole system weighs about 10 kg, so the problem of portability cannot be considered. However, when the emergency start power is replaced with a buried battery, the weight of the whole system is only 400 grams. The volume and weight of the anti-reverse connection short-circuit protection circuit that constitutes the current path of the emergency starting power supply are obviously not suitable.

Therefore, there is an anti-reverse short-circuit protection circuit that uses semiconductor devices to form the current path of the emergency start-up power supply. For example, a patent application number: 201410399268.7 discloses an emergency power supply short-circuit protection system. The anti-reverse short-circuit protection circuit uses field effect tubes to control the current path, which overcomes the relatively bulky defect of the anti-reverse short-circuit protection circuit composed of relays, but there are still: because the current path is immediately opened when the battery on the vehicle is correctly connected, Therefore, there is a defect that the battery clip is caught in the process of clamping the battery on the vehicle; in order to disconnect the emergency starting power supply to the current path of the battery clip after taking out the battery clip from the vehicle's working point, two splints on the upper and lower sides of the battery clip There are points on the inner side that are not in contact with each other at ordinary times, and lead wires to the anti-reverse short-circuit protection circuit, so there is a defect that the battery clip cannot use a single lead wire to the anti-reverse short-circuit protection circuit

Another example is the patent application number: 201520322213.6, which discloses an emergency power supply anti-short-circuit protection system, which can be read in conjunction with the practical drawings: the anti-reverse connection short-circuit protection circuit connected between the emergency start power supply and the vehicle-mounted battery (spare battery) In this way, the field effect tube is used to control the current path, which overcomes the cumbersome defect of the anti-reverse short-circuit protection circuit formed by the relay; The defect that the battery clip is caught in the process of clamping the battery on the car is sparking. Although there is a light touch switch to start the emergency power supply, it is only used to remove the battery on the car; in order to remove the battery clip from the working point of the car Disconnect the emergency starting power supply to the current path of the battery clip. There are points not in contact with each other on the inner side of the upper and lower splints of the battery clip, and lead wires to the anti-reverse short-circuit protection circuit respectively. Therefore, there is a battery clip that cannot be connected with a single lead wire. Defects of anti-reverse connection short-circuit protection circuit; there is another serious defect of this utility: if the emergency start power supply is reversed, it may cause damage to the comparator

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