CN218771266U

CN218771266U - Series type direct current circuit with ultra-low voltage equipment overvoltage protection device

Info

Publication number: CN218771266U
Application number: CN202223010483.2U
Authority: CN
Inventors: 陈琳; 陈赛; 孙涌; 杨超
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-12
Filing date: 2022-11-12
Publication date: 2023-03-28
Anticipated expiration: 2032-11-12

Abstract

The utility model discloses a tandem type direct current circuit with ultralow voltage equipment overvoltage protection device, including RL circuit, inductance, second resistance, first resistance, condenser, RL circuit one end inserts the inductance, and the inductance other end is connected with a parallel circuit, and parallel circuit includes a closed loop branch road that the second resistance constitutes and another closed loop branch road that first resistance, condenser constitute, and first resistance one end is passed through the wire and is connected the inductance, and the other end is established ties there is the condenser. Compared with the prior art, the utility model the advantage lie in: the equipment has strong pertinence to protection objects, is particularly suitable for outdoor monitoring equipment, has a large number of lightning cases to show that the outdoor monitoring equipment becomes the most frequent disaster object of the outdoor equipment in the lightning cases, but in the market at present, an anti-surge protector aiming at specific equipment is blank, and the circuit has low cost, long service life, good protection effect and obvious protection effect on surge voltage caused by induced overvoltage.

Description

Series type direct current circuit with overvoltage protection device of ultra-low voltage equipment

Technical Field

The utility model relates to a circuit transformation specifically indicates a tandem type direct current circuit with ultralow voltage equipment overvoltage protection device.

Background

Most of the existing surge protectors are connected in parallel, and a corresponding grounding system is required in an installation environment; outdoor supervisory equipment is signal equipment, and general protection is mostly signal surge protection, and its direct current supply system is not protected because of its ultralow voltage nature. If the signal lightning protector is installed, the cost is up to hundreds of yuan, and the cost of the signal lightning protector is about 1000. Is not economically feasible.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that present overvoltage protector protection level is too high, generally reaches more than 220V, and there is the neutral to the below especially equipment protection of 24V of ultralow pressure. The similar ultra-low voltage protector is usually protected by signals and power supplies together, is mostly connected in parallel, has a complex structure and higher requirements on installation environment, and outdoor monitoring equipment is usually installed in the field, so that the environment is difficult to meet. The technical difficulties of the current equipment include: 1) The series connection has no requirement on a line grounding system, and is beneficial to installation in various environments; 2) The components are relatively simple in structure and lower in cost, and can be widely applied to actual scenes; 3) The surge protection devices on the market are basically general, and a special overvoltage protection lightning protection device for outdoor direct-current ultra-low voltage equipment is blank in the market at present.

In order to solve the technical problem, the utility model provides a technical scheme does: a series direct current circuit with an overvoltage protection device of ultra-low voltage equipment comprises an RL circuit, an inductor, a second resistor, a first resistor and a capacitor, wherein one end of the RL circuit is connected into the inductor, the other end of the inductor is connected with a parallel circuit, the parallel circuit comprises a closed loop branch circuit formed by the second resistor and another closed loop branch circuit formed by the first resistor and the capacitor, one end of the first resistor is connected with the inductor through a lead, the other end of the first resistor is connected with the capacitor in series, and the capacitor is connected into the RL circuit through the lead.

Compared with the prior art, the utility model the advantage lie in: the equipment has strong pertinence to protection objects, is particularly suitable for outdoor monitoring equipment, has a large number of lightning cases to show that the outdoor monitoring equipment becomes the most frequent disaster object of the outdoor equipment in the lightning cases, but in the market at present, an anti-surge protector aiming at specific equipment is blank, and the circuit has low cost, long service life, good protection effect and obvious protection effect on surge voltage caused by induced overvoltage.

Further, a second resistor in the parallel circuit is connected to a zero potential reference point through a lead.

Further, the capacitor comprises two operating states: 1) The capacitor is disconnected, the direct current passes through the inductor, and the second resistor works normally; 2) And in the capacitor access, the first resistor is in a high-impedance state, the inductor works to drive the RL circuit to work, a closed-loop branch formed by the inductor and the second resistor is disconnected, and the second resistor is in a broken circuit state.

Drawings

Fig. 1 is a schematic diagram of a series dc circuit with an overvoltage protection device for an ultra low voltage apparatus.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model discloses when concrete implementation, in the embodiment shown in fig. 1, provide a tandem type direct current circuit with ultralow voltage equipment overvoltage protection device, including RL circuit (RL 1), inductance (L1), second resistance (R2), first resistance (R1), condenser (C1), inductance is inserted to RL circuit one end, the inductance other end is connected with a parallel circuit, parallel circuit includes a closed loop branch road and first resistance that second resistance constitutes, another closed loop branch road that the condenser constitutes, the inductance is connected through the wire to first resistance one end, the other end is established ties there is the condenser, the condenser inserts the RL circuit through the wire.

Structurally, compared with the scheme project on the market at present, the circuit greatly simplifies the circuit structure, all components are durable components with long service life, when the circuit works in a normal state in a direct current mode, the lower circuit is broken due to the arrangement of C1, the working current works in R2 normally, when the voltage of lightning current pulse current is sensed, C1 is broken, and R1 is in a high-resistance state; the upper circuit relay works to cut off the current, and the inductor L1 works to become an increasing resistor. Even if the overvoltage passing through the device reaches the R2 device instantaneously, the voltage division effect can be achieved, and the R2 is protected.

The utility model discloses a theory of operation: the invention relates to an overvoltage protector which is installed in series on an ultra-low voltage (50V or lower) and direct current line. When the line of the ultra-low voltage direct current equipment (such as outdoor monitoring equipment (rated voltage 12-24V)) senses lightning electromagnetic induction, induced overvoltage is generated on the line firstly, and the outdoor monitoring equipment generally does not take any protection measures at present, so that the loss is huge. The series connection device is arranged at the front end of the equipment, and when the overvoltage is sensed, the equipment is automatically cut off in time, so that the outdoor monitoring equipment is protected.

The working state comprises the following steps:

1) When the direct current works normally: c1 is disconnected, direct current passes through L1, and R2 works normally;

2) Lightning impulse voltage: c1 path, R1 high impedance. L1 generates inductance, RL1 operates to open the upper circuit, bringing R2 into an open circuit configuration. And protecting the R2 equipment.

Having shown and described the basic principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are given by way of illustration only, but rather are susceptible to various changes and modifications without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The series type direct current circuit with the overvoltage protection device of the ultra-low voltage equipment comprises an RL circuit, an inductor, a second resistor, a first resistor and a capacitor, and is characterized in that: one end of the RL circuit is connected with an inductor, the other end of the inductor is connected with a parallel circuit, the parallel circuit comprises a closed loop branch formed by a second resistor and another closed loop branch formed by a first resistor and a capacitor, one end of the first resistor is connected with the inductor through a lead, the other end of the first resistor is connected with the capacitor in series, and the capacitor is connected into the RL circuit through the lead.

2. A series dc circuit with overvoltage protection for ultra low voltage equipment as claimed in claim 1 wherein: and a second resistor in the parallel circuit is connected to a zero potential reference point through a lead.

3. A series dc circuit with an overvoltage protection device for ultra low voltage equipment as claimed in claim 1 wherein said capacitor includes two operating states: 1) The capacitor is disconnected, the direct current passes through the inductor, and the second resistor works normally; 2) And in the capacitor access, the first resistor is in a high-impedance state, the inductor works to drive the RL circuit to work, a closed-loop branch formed by the inductor and the second resistor is disconnected, and the second resistor is in a broken circuit state.