Intelligent fireproof current-limiting protection box

Abstract

The utility model relates to an intelligent fireproof current-limiting protection box, the protection box comprises a housing and a circuit part fixed in the housing, the circuit part comprises a main circuit board and an MOS switch group for controlling the on-off of the main circuit board, the main circuit board is divided into an upper circuit board and a lower circuit board, and the MOS switch group is installed between the upper circuit board and the lower circuit board. The MOS switch group comprises at least two rows of MOS tube groups, the back surface of each row of MOS tube group is provided with an integrated first guide plate which is conductively connected with the middle pin of the MOS tube in a tin soldering manner, the plate surface of the first guide plate is provided with a cooling fin in a welding manner, and the pins on the two sides of the MOS switch group are conductively integrated with a second guide plate on the lower end surface of the lower circuit board in a tin soldering manner; the first guide plate is provided with a guide connecting part protruding upwards, and the lower end face of the upper circuit board is conductively integrated with a third guide plate which is connected with the guide connecting part of the first guide plate in an inserted and tin soldering mode, that is, the upper circuit board and the lower circuit board are conductively connected through the MOS switch group. The MOS switch group is not easy to heat and damage, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electrical equipment, and it is an intelligent fireproof current limiting protection box. BACKGROUND

[0002] With the development of intelligent modernization, the traditional circuit breaker and air switch are gradually replaced by the existing intelligent power distribution equipment. The existing intelligent power distribution equipment, such as current limiting protector, can effectively overcome the drawbacks of the traditional circuit breaker, air switch and monitoring equipment, such as large short-circuit current, long short-circuit cutting time, large arc spark generated during short-circuit, and short service life. When a short-circuit fault occurs, the current limiting protector can quickly limit the short-circuit current at a microsecond level to achieve current limiting protection, thereby reducing electrical accidents and ensuring personnel and property safety. For example, the patent document CN107947107A published on April 20, 2018, discloses a short-circuit protector circuit with current limiting function, which uses a MOS tube circuit to replace a fuse to limit the short-circuit current and cut off the short-circuit current. Another example is the patent document CN206323120U published on July 11, 2017, which discloses a high-power rapid electrical fire current limiting protector. The MOS tube switching element is connected in series in the live line and is controlled by the driving circuit to close or open. It has the characteristics of fast short-circuit fault current breaking, no electric spark generation, and strong load carrying capacity. The above two solutions both disclose that the MOS tube can quickly cut off the short-circuit current to improve the reliability of short-circuit protection. However, the MOS tube as a switching element often has problems such as heat loss and heating during actual use. Although the existing technology discloses a solution of adding a cooling fan to the MOS tube, the MOS tube pin is directly welded to the circuit board, the heat dissipation area at the connection is small, the actual heat dissipation is limited, and as the number of electrical equipment increases, the current increases, the heat dissipation performance of the MOS tube is more restricted, which leads to large heat generation and easy damage of the MOS tube, making it difficult to be applied to high-current breaking control, affecting the actual use and service life. Therefore, it is necessary to improve the heat dissipation structure of the MOS tube as a switching control in the existing current limiting protector. SUMMARY

[0003] To overcome the above-mentioned shortcomings, the utility model aims to provide an intelligent fireproof current limiting protection box to solve the technical problem of poor heat dissipation performance of the MOS tube group switch in the existing similar current limiting protector, which leads to easy damage of the MOS tube, affecting the reliability and service life of the protection circuit. The technical scheme is as follows.

[0004] The application discloses an intelligent fireproof current-limiting protection box, which comprises a cover shell and a circuit part fixed in the cover shell, wherein the circuit part comprises a main circuit board and a MOS switch group serving as on-off control of the main circuit board, and the main circuit board is divided into an upper circuit board and a lower circuit board, the upper circuit board and the lower circuit board are fixedly connected through copper columns, the MOS switch group is arranged between the upper circuit board and the lower circuit board, the MOS switch group comprises at least two rows of MOS tube groups, the back surface of each row of MOS tube groups is tin soldered with an integrated first flow guide plate which is guided to the middle pin of the MOS tube, the plate surface of the first flow guide plate is welded with a cooling fin, the two side pins of the MOS switch group are tin soldered with a second flow guide plate which is electrically integrated with the lower end surface of the lower circuit board, the first flow guide plate is provided with an upward protruding guide part, the lower end surface of the upper circuit board is electrically integrated with a third flow guide plate which is inserted into the guide part of the first flow guide plate and tin soldered, and the upper circuit board and the lower circuit board are electrically connected through the MOS switch group. Through the structure, the contact area of the MOS switch group and the circuit board is greatly increased, the heat dissipation area is increased, the heat dissipation performance of the MOS switch group is greatly improved, the normal work of the MOS switch group is ensured, the MOS switch group is not easy to be damaged by heat, and the service life of the protection circuit is prolonged.

[0005] A pair of heat dissipation fans are arranged in the protection box, the pair of heat dissipation fans are arranged at the two ends of the MOS switch group, the pair of heat dissipation fans form convection heat dissipation to the MOS switch group, the cooling fin, the first flow guide plate, the second flow guide plate and the third flow guide plate, and the cover shell of the protection box is provided with heat dissipation ports corresponding to the heat dissipation fans. Through the structure, the double-fan convection heat dissipation is utilized, the heat dissipation effect of the MOS switch group is further improved, the reliability of the MOS switch group is ensured, and the service life is prolonged.

[0006] A circuit breaker serving as a general switch and being arranged in the protection box is arranged to serve as on-off control of the main circuit board. Through the structure, the protection reliability of the protection circuit is further improved, and manual on-off operation is facilitated.

[0007] The circuit part includes a main switch controller, a branch switch controller, a power module, a main circuit board integrated logic controller, a live wire passage, a zero wire passage, the main switch controller and the branch switch controller are connected to the logic controller, the power module supplies power for the logic controller, the main switch controller, the branch switch controller and a heat dissipation module, the main switch controller includes an electric leakage mutual inductor, a voltage mutual inductor, a current monitor, a MOS switch group, a first magnetic latching relay, a voltage impact buffer, a temperature sensor and a first zero wire magnetic latching relay, the branch switch controller includes a load magnetic latching relay and a current mutual inductor, the zero wire passage is connected to the electric leakage mutual inductor for electric leakage monitoring and the first zero wire magnetic latching relay for opening and closing control, the live wire passage is connected to the voltage mutual inductor for voltage monitoring and the current monitor for current monitoring, the MOS switch group and the first magnetic latching relay are connected in series to the live wire passage as two switches, the voltage impact buffer is connected in parallel to the live wire passage with respect to the MOS switch group, the voltage impact buffer turns on the live wire passage and reduces voltage and current when the voltage across the MOS switch group is greater than a set value, the temperature sensor monitors the temperature of the MOS tube of the MOS switch group, the live wire passage is branched at the end to form a row of branches, each branch is provided with the load magnetic latching relay for opening and closing control and the current mutual inductor for monitoring the branch current, and each branch is provided with a load interface for connecting an external load device; the main switch controller and the branch switch controller are connected to the logic controller, when the values sensed by the electric leakage mutual inductor, the voltage mutual inductor, the current monitor, the temperature sensor and the current mutual inductor are greater than the threshold value set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first zero wire magnetic latching relay and the load magnetic latching relay to be disconnected. The above structure realizes effective protection against electric leakage, voltage and current overload and short circuit, utilizes the microsecond-level shutdown characteristics of the MOS switch group, and thus the protection is more reliable. Meanwhile, by additionally providing the voltage impact buffer, when the MOS switch group is turned off to cope with a high-power inductive load, the voltage across the MOS switch group is reduced by the voltage impact buffer, thus effectively protecting the MOS switch group from overvoltage, preventing damage and ensuring safe and reliable use, long service life and wide applicability to load characteristics. In addition, the loop current after voltage reduction and current limitation by the voltage impact buffer is small, so that the first magnetic latching relay is not easy to produce arc spark when disconnected, which is safer.

[0008] The main circuit board is integrated with a metering module for counting power consumption. Through the structure, the power consumption is conveniently counted.

[0009] The main switch controller comprises a second magnetic latching relay, which is connected in parallel with the MOS switch group, the voltage surge buffer and the firewire passage of the main circuit board as a switch; the second magnetic latching relay is initially in an off state, and when the temperature sensed by the temperature sensor approaches the set threshold of the corresponding temperature sensor of the logic controller, the second magnetic latching relay turns on the firewire passage. Through the structure, the shunt operation of the MOS switch group is facilitated, so that the temperature of the MOS tube group is reduced, and the use reliability and service life of the MOS tube group are improved.

[0010] The circuit part comprises an interaction module and a communication module connected with the logic controller, the interaction module integrates operation buttons, a display screen, indicator lights and a buzzer, and the communication module integrates a network communication module and a carrier wave communication module. Through the structure, the man-machine interaction use and remote connection use of the protector are facilitated.

[0011] The load magnetic latching relay is provided with a manual switch. Through the structure, the opening and closing of the load device are facilitated.

[0012] The utility model mainly improves the heat dissipation performance of MOS switch group, guarantees the work reliability of MOS switch group, is not easy to overheat damage, thereby improves the service life of protection circuit. In addition, the fireproof current limiting protector box has the functions of leakage, voltage and current overload, short circuit, overheating protection and electric quantity statistics, effectively protects the MOS switch group from overshoot and overheating, is safe to use, has long service life, and is suitable for various load devices, especially large current and multi-load power supply circuit, or the improvement of similar protector structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the explosion structure schematic of the utility model Figure 1 .

[0014] Figure 2 is the explosion structure schematic of the utility model Figure 2 .

[0015] Figure 3 is the internal structure schematic of the utility model.

[0016] Figure 4 is Figure 3 the three-dimensional structure schematic of.

[0017] Figure 5 is the top surface structure schematic of the utility model.

[0018] Figure number and name are: 1, cover, 2, interactive module, 3, communication module, 4, metering module, 5, power module, 6, circuit breaker, 601, mains live interface, 602, mains neutral interface, 7, cooling fan, 8, main circuit board, 801, upper circuit board, 802, lower circuit board, 803, neutral output interface, 9, leakage mutual inductor, 10, first neutral magnetic latching relay, 11, first magnetic latching relay, 12, second magnetic latching relay, 13, load magnetic latching relay, 14, current mutual inductor, 15, load interface, 16, MOS switch group, 17, first flow guide plate, 1701, guide connection part, 18, cooling fin, 19, second flow guide plate, 20, third flow guide plate, 21, current monitor, 22, voltage impact buffer. Embodiment

[0019] The utility model will be further described with reference to the drawings.

[0020] As Figures 1-5As shown, the intelligent fireproof current limiting protection box includes a shell and a circuit part fixed in the shell, the circuit part includes a circuit breaker 6, an interaction module 2, a communication module 3, a main circuit board 8, a main switch controller, a branch switch controller, a power module 5, a heat dissipation module, the firewire and zero line of the circuit breaker are connected to the main circuit board, the interaction module integrates operation buttons, a display screen, indicator lights, and a buzzer, the communication module integrates a network communication module and a carrier wave communication module, the main circuit board integrates a logic controller, a firewire path, a zero line path, and a metering module 4 for counting power consumption, the interaction module, the communication module, the main switch controller, and the branch switch controller are connected to the logic controller, the power module is connected to the firewire path and the zero line path of the main circuit board, and after voltage reduction and rectification, it serves as power supply for the interaction module, the communication module, the logic controller, the main switch controller, the branch switch controller, the heat dissipation module, and the metering module, the interaction module realizes manual input of the logic controller and information output of the display screen, the indicator lights, and the buzzer, the network communication module realizes remote control connection with external servers or terminal devices through WIFI network, 5G network, and carrier wave network. The main switch controller includes a leakage mutual inductor 9, a voltage mutual inductor, a current monitor 21, a MOS switch group 16, a first magnetic latching relay 11, a voltage impact buffer 22, a temperature sensor, and a first zero line magnetic latching relay 10, and the branch switch controller includes a load magnetic latching relay 13 and a current mutual inductor 14. One end of the zero line path of the main circuit board is connected to the zero line output end of the circuit breaker, the other end is connected to a zero line output interface 803, and the zero line path is provided with the above-mentioned leakage mutual inductor for detecting leakage current and the above-mentioned zero line magnetic latching relay for controlling opening and closing. One end of the firewire path of the main circuit board is connected to the firewire output end of the circuit breaker, the firewire path is provided with the above-mentioned voltage mutual inductor for monitoring voltage and the above-mentioned current monitor for monitoring current, the above-mentioned MOS switch group and the first magnetic latching relay are connected in series to the firewire path as two switches, the voltage impact buffer is connected in parallel to the MOS switch group to the firewire path, the voltage impact buffer is turned on to the firewire path and reduces current when the voltage across the MOS switch group is greater than a set value, the temperature sensor corresponds to the temperature of the MOS tube of the MOS switch group, the other end of the firewire path branches into a row of branches, each branch is provided with a load magnetic latching relay with a manual switch for controlling opening and closing and a current mutual inductor for monitoring branch current, and each branch end is provided with a load interface 15 for connecting external load equipment. The above-mentioned main switch controller and branch switch controller are connected to the logic controller and are set as follows: when the values sensed by the leakage mutual inductor, the voltage mutual inductor, the current monitor, the temperature sensor, and the current mutual inductor are greater than the threshold value set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first zero line magnetic latching relay, and the load magnetic latching relay to be disconnected, cutting off the circuit and realizing current limiting protection.

[0021] The main design of the intelligent fireproof current limiting protection box is that the main circuit board 8 is divided into an upper circuit board 801 and a lower circuit board 802, the upper circuit board and the lower circuit board are fixedly connected through copper columns, an MOS switch group 16 is installed in the space position between the upper circuit board and the lower circuit board, the MOS switch group includes two rows of MOS tube groups, the back surface of each row of MOS tube groups is tin soldered with an integrated first flow guide plate 17 which is guided to the middle pin of the MOS tube, the plate surface of the first flow guide plate is welded with a heat sink 18, the two side pins of the MOS switch group are tin soldered with a second flow guide plate 19 which is electrically integrated with the lower end surface of the lower circuit board, each first flow guide plate is provided with an upwardly protruding guide part 1701, the lower end surface of the upper circuit board is electrically integrated with two third flow guide plates 20 which are correspondingly inserted into the guide parts of the two first flow guide plates and are tin soldered, that is, the upper circuit board and the lower circuit board are electrically connected through the MOS switch group.

[0022] The heat dissipation module is a pair of heat dissipation fans 7 which are located at the two end directions of the MOS switch group 16, the pair of heat dissipation fans form convection heat dissipation to the MOS switch group, the heat sink 18, the first flow guide plate 17, the second flow guide plate 19, the third flow guide plate 20, the cover shell 1 of the protection box is provided with heat dissipation ports corresponding to the heat dissipation fans. When the temperature sensor senses that the temperature of the MOS switch group is greater than the set value, the heat dissipation fans are started to work, so that the MOS switch group is cooled.

[0023] In order to further realize the temperature control protection of the MOS switch group 16, the above-mentioned main switch controller includes a second magnetic latching relay 12 which is connected in parallel to the fire line path of the main circuit board 8 as a switch relative to the MOS switch group and the voltage surge buffer 22. The initial state of the second magnetic latching relay is off, when the temperature sensed by the temperature sensor approaches the set threshold value of the temperature sensor corresponding to the logic controller, the second magnetic latching relay turns on the fire line path, so that the current of the MOS switch group is shunted, thereby effectively reducing the temperature of the MOS tube group and improving the use reliability and service life of the MOS tube group.

[0024] Further, the working method of the protector is described as follows in combination with the drawings: when the protection box is used, the circuit breaker 6 of the protection box is connected to external power supply through the live wire interface 601 and the neutral wire interface 602 of the power supply, the load interface 15 is externally connected to a load device, and the neutral wire of the load device is connected to the neutral wire output interface 803 of the main circuit board 8. In the initial state, the MOS switch group 16, the first magnetic latching relay 11, the second magnetic latching relay 12, the first neutral wire magnetic latching relay 10 and the load magnetic latching relay 13 are all in the off state. The instructions from the external remote device are accepted by the manual operation interactive module 2 or the communication module 3, and the first magnetic latching relay, the neutral wire magnetic latching relay and the load magnetic latching relay are controlled to be turned on by the logic controller, and then the MOS switch group is controlled to be turned on. Because the MOS switch group has the arcless characteristic, when the live wire passage of the main circuit board is turned on, there is no arc spark. When the logic controller receives the off signal, or the values sensed by the leakage current transformer 9, the voltage transformer, the current monitor 21, the current transformer 14 and the temperature sensor are greater than the threshold value set in the logic controller, the MOS switch group is controlled to be turned off first, and then the first magnetic latching relay, the first neutral wire magnetic latching relay and the load magnetic latching relay are controlled to be turned off. During the off process, if the load device is a high-power inductive load, the total power of the load device does not change when the MOS switch group is turned off, but the current suddenly decreases, which may cause a sudden increase in the impact voltage of the live wire passage. If the impact voltage is greater than the triggering value of the voltage impact buffer 22, the voltage impact buffer limits the voltage and reduces the voltage across the MOS switch group, and the voltage impact buffer circuit turns on the live wire passage to form a small current, which is not enough to form an arc phenomenon when the first magnetic latching relay, the first neutral wire magnetic latching relay and the load magnetic latching relay are turned off, so that the circuit is arcless and the MOS switch group is protected. When the temperature of the MOS switch group rises during the working process, the temperature of the MOS switch group is sensed by the temperature sensor, and the logic controller controls the cooling fan 7 to be turned on to realize the temperature reduction protection of the MOS switch group. If the temperature of the MOS switch group is still close to the threshold value of the corresponding temperature sensor of the logic controller under the cooling effect of the cooling fan, the second magnetic latching relay is controlled to be turned on by the logic controller to realize the current shunt operation of the MOS switch group, so as to realize the temperature reduction protection of the MOS switch group. In addition to the above, according to the actual current limiting protection requirements, the logic controller can be set by the interactive module or the communication module, so as to realize various combined protection functions and meet the protection requirements of various electrical devices.

[0025] The above is intended to illustrate the technical means of the present application, not to limit the technical range of the present application. Those skilled in the art can make obvious improvements or replacements to the present application according to the existing common knowledge, which also falls within the protection scope of the claims of the present application.

Claims

1. An intelligent fireproof current limiting protection box, the protection box comprising a housing (1) and a circuit part fixed in the housing, the circuit part comprising a main circuit board (8) and a MOS switch group (16) as on-off control of the main circuit board, characterized in that The main circuit board is divided into an upper circuit board (801) and a lower circuit board (802), the upper circuit board and the lower circuit board are fixedly connected through copper columns, the MOS switch group (16) is installed between the upper circuit board and the lower circuit board, the MOS switch group comprises at least two rows of MOS tube groups, the back surface of each row of MOS tube groups is tin soldered with an integral first flow guide plate (17) which is guided to the middle pin of the MOS tube, the plate surface of the first flow guide plate is welded with a heat dissipation fin (18), the two side pins of the MOS switch group are tin soldered with a second flow guide plate (19) which is electrically integrated with the lower end surface of the lower circuit board, the first flow guide plate is provided with an upward protruding guide part (1701), the lower end surface of the upper circuit board is integrally provided with a third flow guide plate (20) which is inserted and tin soldered with the guide part of the first flow guide plate, that is, the upper circuit board and the lower circuit board are electrically connected through the MOS switch group.

2. The intelligent fireproof current limiting protection box of claim 1, wherein The protection box is provided with a pair of heat dissipation fans (7) which are located at the two end directions of the MOS switch group (16) and form convection heat dissipation to the MOS switch group, the heat dissipation fin (18), the first flow guide plate (17), the second flow guide plate (19) and the third flow guide plate (20), and the cover (1) of the protection box is provided with heat dissipation openings corresponding to the heat dissipation fans.

3. The intelligent fireproof current limiting protection box of claim 1, wherein The protection box is provided with a circuit breaker (6) which is used as a general switch and controls the on-off of the main circuit board (8).

4. The intelligent fire protective current limiting box of claim 1, wherein The circuit part includes a main switch controller, a branch switch controller, a power module (5), the main circuit board (8) integrates a logic controller, a live wire passage, a zero wire passage, the main switch controller and the branch switch controller are connected to the logic controller, and the power module supplies power for the logic controller, the main switch controller, the branch switch controller and a heat dissipation module; the main switch controller includes a leakage mutual inductor (9), a voltage mutual inductor, a current monitor (21), a MOS switch group (16), a first magnetic latching relay (11), a voltage surge buffer (22), a temperature sensor and a first zero wire magnetic latching relay (10); the branch switch controller includes a load magnetic latching relay (13) and a current mutual inductor (14); the zero wire passage is connected to the leakage mutual inductor for leakage monitoring and the first zero wire magnetic latching relay for opening control; the live wire passage is connected to the voltage mutual inductor for voltage monitoring and the current monitor for current monitoring; the MOS switch group and the first magnetic latching relay are connected in series to the live wire passage as two switches; the voltage surge buffer is connected in parallel to the live wire passage with respect to the MOS switch group, and the voltage surge buffer turns on the live wire passage and reduces voltage and current when the voltage across the MOS switch group is greater than a set value; the temperature sensor monitors the temperature of the MOS switch group; the live wire passage is branched at the end to form a row of branches, each branch is provided with the load magnetic latching relay for opening control and the current mutual inductor for monitoring the branch current, and each branch is provided with a load interface (15) for connecting an external load device; when the values sensed by the leakage mutual inductor, the voltage mutual inductor, the current monitor, the temperature sensor and the current mutual inductor are greater than the threshold value set by the logic controller, the logic controller controls the MOS switch group, the first magnetic latching relay, the first zero wire magnetic latching relay and the load magnetic latching relay to be disconnected.

5. The intelligent fire protective current limiting box of claim 4, wherein The main circuit board (8) is integrated with a metering module (4) for counting power consumption.

6. The intelligent fire protective current limiting box of claim 4, wherein The main switch controller includes a second magnetic latching relay (12) connected in parallel to the live wire passage of the main circuit board (8) as a switch with respect to the MOS switch group (16) and the voltage surge buffer (22); the second magnetic latching relay is initially disconnected, and when the temperature sensed by the temperature sensor approaches the threshold value set by the corresponding temperature sensor of the logic controller, the second magnetic latching relay turns on the live wire passage.

7. The intelligent fire protective current limiting box of claim 4, wherein The circuit part includes an interaction module (2) and a communication module (3) connected to the logic controller; the interaction module integrates operation buttons, a display screen, indicator lights and a buzzer; and the communication module integrates a network communication module and a carrier wave communication module.

8. The intelligent fire protective current limiting box of claim 4, wherein The load magnetic latching relay (13) is provided with a manual switch.

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