Current switch device for zero line and live line protection

Abstract

The utility model relates to the technical field of current switches, in particular to a current switch device for zero line and live line protection. Comprising a main circuit board; the main circuit board is provided with a current mutual inductance board, a control circuit board, an isolation driving part, a power supply, a current switch and a heat dissipation mechanism. The heat dissipation mechanism comprises a heat dissipation device and heat dissipation fans, the heat dissipation fans are installed at the two ends of the heat dissipation device, and at least one current switch is arranged on the front side face and the rear side face of the heat dissipation device; the heat dissipation mechanism is arranged, and the current switch is in contact with the heat dissipation device, so that heat on the current switch can be quickly transmitted to the heat dissipation device and then is discharged through the heat dissipation fan, the temperature of the current switch in use is effectively reduced, the power consumption of the current switch is reduced, and the current switch is effectively protected; meanwhile, heat generated by the main circuit board, the current transformer board and the control circuit board can be discharged outwards through the heat dissipation mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to current switch technical field especially is used for current switch device of zero fire line protection. BACKGROUND

[0002] When the live wire and the zero wire of the alternating current 220V are short-circuited, the current in the circuit increases several times or even several tens or hundreds of times of the normal time, and the heat generated is directly proportional to the square of the current, so that the temperature rises sharply and greatly exceeds the allowable range. If the temperature reaches the ignition temperature of the combustible material, it will cause combustion and lead to fire. When the insulation of electrical equipment deteriorates or loses insulation ability due to high temperature, moisture or corrosion, it may cause a short circuit accident.

[0003] Now, in the face of zero fire line short circuit, the circuit breaker or air switch is generally used for protection, and the principle of the circuit breaker is that the coil of the current release device and the thermal element of the thermal release device are connected in series with the main circuit. When the circuit is short-circuited or seriously overloaded, the armature of the current release device is attracted to make the free release mechanism act, and the main contact breaks the main circuit. The reaction time of the general circuit breaker to start action is about 20 milliseconds (one current cycle). The time from the start of the circuit breaker to the complete disconnection (arc extinguishing) is about 50 to 100 milliseconds. At this time, high-energy arc has been generated at the short-circuit position, and it ignites the combustible material or gas, thereby causing a fire.

[0004] It is understood that the products known to break the alternating current are basically in milliseconds or seconds, which cannot break the circuit when the arc does not appear. In addition, the temperature of the current switch used will continue to rise, and when the temperature is high, the power consumption is large, and the current switch is easily damaged. Therefore, we propose a current switch device for zero fire line protection. Utility model content

[0005] In view of the deficiencies of the prior art, the utility model provides a current switch device for zero fire line protection, which can effectively solve the problems in the background art.

[0006] The technical scheme of the utility model is:

[0007] The utility model provides a current switch device for zero live line protection, including main circuit board, current mutual inductance board, control circuit board, isolation drive, power, current switch and heat abstract mechanism, current mutual inductance board, control circuit board, isolation drive, power, current switch and heat abstract mechanism are arranged respectively on the main circuit board, the power is arranged on one end of main circuit board, the control circuit board is arranged on the top surface of power, the heat abstract mechanism is arranged on the other end of main circuit board, current mutual inductance board and isolation drive are arranged respectively on both sides of heat abstract mechanism, the heat abstract mechanism includes radiator and heat dissipation fan, both ends of radiator are installed with heat dissipation fan, and current switch is arranged at least on the front and back sides of radiator.

[0008] Further, the switch device further comprises a fire zero line input interface and a fire zero line output interface, the fire zero line input interface and the fire zero line output interface are fixedly installed on the top surface of the main circuit board, and the fire zero line input interface and the fire zero line output interface are arranged at the front and rear ends of the power respectively.

[0009] Further, the main circuit board is electrically connected with the current mutual inductance board, the control circuit board, the isolation drive and the power respectively, the control circuit board is electrically connected with the heat dissipation fan, the current switch, the current mutual inductance board and the isolation drive respectively, the current mutual inductance board is electrically connected with the current switch, the fire zero line output interface is electrically connected with the current mutual inductance board, the fire zero line input interface is electrically connected with the current switch, and the power is electrically connected with the fire zero line input interface, the main circuit board, the current mutual inductance board, the control circuit board, the isolation drive, the current switch and the heat dissipation fan respectively.

[0010] Further, the radiator is a finned radiator, and the current switch is in contact with the fins on the radiator.

[0011] Further, the control circuit board further comprises a filter following module, an AD sampling module and a control module.

[0012] Further, the heat dissipation fan is fixed on the radiator by clamping or inserting.

[0013] Further, the bottom surface of the main circuit board is fixedly installed with a bare copper layer.

[0014] The utility model discloses a current switch device for zero live line protection, including main circuit board, current mutual inductance board, control circuit board, isolation drive, power, current switch and heat abstract mechanism, current mutual inductance board, control circuit board, isolation drive, power, current switch and heat abstract mechanism are arranged respectively on the main circuit board, the power is arranged on one end of main circuit board, the control circuit board is arranged on the top surface of power, the heat abstract mechanism is arranged on the other end of main circuit board, current mutual inductance board and isolation drive are arranged respectively on both sides of heat abstract mechanism, the heat abstract mechanism includes radiator and heat dissipation fan, both ends of radiator are installed with heat dissipation fan, and current switch is arranged at least on the front and back sides of radiator.

[0015] 1、 through being equipped with heat abstract mechanism, and, current switch contacts radiator, make the heat on current switch can quickly transmit to radiator, again through heat dissipation fan, and it exports, and then effectively reduce the temperature of current switch when using, make its power consumption small, and then effectively protect current switch, simultaneously, heat abstract mechanism can also export the heat that main circuit board, current mutual inductance board and control circuit board generate to the outside.

[0016] 2, The technology can be used for short-circuit arc extinguishing protection and overload protection in low-voltage distribution lines, and can reasonably overcome the disadvantages of large short-circuit current, long short-circuit current cutting time, large arc spark generated during short-circuit, short service life and the like of traditional circuit breakers, air switches and monitoring devices, and when a short-circuit fault occurs, the short-circuit current can be quickly limited at a microsecond level to realize arc extinguishing protection, which can significantly reduce electrical fire accidents and ensure the safety of personnel and property in the use place. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the second side of the utility model;

[0018] Figure 2 It is a structure schematic view of the second side of the utility model;

[0019] Figure 3 It is a structure schematic view of the third side of the utility model;

[0020] Figure 4 It is a basic function flow chart of the current switch device of the utility model;

[0021] Figure 5 It is a structure layout schematic view of the utility model;

[0022] Figure 6 It is a schematic view of the current switch device of the utility model and the intelligent circuit breaker used in cooperation;

[0023] Figure 7 It is a schematic view of the current switch device of the utility model used in combination with the single-phase intelligent safety power utilization device;

[0024] Figure 8 It is a schematic view of the current switch device of the utility model combined with cloud technology;

[0025] Figure 9 It is a schematic view of the current switch device of the utility model with a display screen and a key.

[0026] In the figure, 1, main circuit board; 2, current mutual inductance board; 3, control circuit board; 4, isolation driving part; 5, power supply; 6, current switch; 7, heat dissipation mechanism; 8, radiator; 9, heat dissipation fan; 10, fire zero line input interface; 11, fire zero line output interface; 12, bare copper layer. DETAILED DESCRIPTION

[0027] The specific implementation of the utility model will be further described below in combination with the drawings:

[0028] As shown in the drawings, Figures 1-9

[0029] ​The utility model provides a current switch device for zero live line protection, including main circuit board 1, current mutual inductance board 2, control circuit board 3, isolation drive 4, power supply 5, current switch 6 and heat abstractor 7, current mutual inductance board 2, control circuit board 3, isolation drive 4, power supply 5, current switch 6 and heat abstractor 7 are arranged respectively on main circuit board 1, power supply 5 is arranged on one end of main circuit board 1, control circuit board 3 is arranged on the top surface of power supply 5, heat abstractor 7 is arranged on the other end of main circuit board 1, current mutual inductance board 2 and isolation drive 4 are arranged respectively on both sides of heat abstractor 7, heat abstractor 7 includes radiator 8 and cooling fan 9, both ends of radiator 8 are equipped with cooling fan 9, and current switch 6 is arranged at least on the front and back sides of radiator 8, and current mutual inductance board 2, isolation drive 4, power supply 5, current switch 6 and heat abstractor 7 can be fixed on the top surface of main circuit board 1 by welding or other fixed mode, and control circuit board 3 can be fixedly installed on the top surface of power supply 5, by being provided with heat abstractor 7, and current switch 6 contacts radiator 8, so that the heat on current switch 6 can be quickly transmitted to radiator 8, then is discharged by cooling fan 9, thereby effectively reducing the temperature of current switch 6 during use, making its power consumption smaller, thereby effectively protecting current switch 6, and heat abstractor 7 can also discharge the heat generated by main circuit board 1, current mutual inductance board 2 and control circuit board 3 outward.

[0030] As a preferred implementation mode, the switch device further comprises a live zero line input interface 10 and a live zero line output interface 11, the live zero line input interface 10 and the live zero line output interface 11 are fixedly installed on the top surface of the main circuit board 1, and the live zero line input interface 10 and the live zero line output interface 11 are arranged at the front and back ends of the power supply 5 respectively.

[0031] In the above scheme, electricity enters through the live zero line input interface 10, reaches the power supply 5 (power supply) and the current switch 6 respectively, then reaches the current mutual inductance board 2 through the current switch 6, and finally is output through the live zero line output interface 11.

[0032] As a preferred implementation mode, the main circuit board 1 is electrically connected with the current mutual inductance board 2, the control circuit board 3, the isolation drive 4 and the power supply 5 respectively, the control circuit board 3 is electrically connected with the cooling fan 9, the current switch 6, the current mutual inductance board 2 and the isolation drive 4 respectively, the current mutual inductance board 2 is electrically connected with the current switch 6, the live zero line output interface 11 is electrically connected with the current mutual inductance board 2, the live zero line input interface 10 is electrically connected with the current switch 6, and the power supply 5 is electrically connected with the live zero line input interface 10, the main circuit board 1, the current mutual inductance board 2, the control circuit board 3, the isolation drive 4, the current switch 6 and the cooling fan 9 respectively. The electrical connection can be divided into power connection and signal connection.

[0033] As a preferred embodiment; the heat sink 8 is a fin heat sink 8, the current switch 6 is in contact with the fin on the heat sink 8.

[0034] As a preferred embodiment; the control circuit board 3 is also provided with a filter following module, an AD sampling module and a control module.

[0035] As a preferred embodiment; the heat dissipation fan 9 is fixed on the heat sink 8 by clamping or inserting.

[0036] As a preferred embodiment; the bottom surface of the main circuit board 1 is fixedly installed with a bare copper layer 12. The bare copper layer 12 is welded with copper bars as needed in order to pass through the rated large current.

[0037] In this embodiment, the current switch: composed of field effect tube and related circuit, can adopt different number of field effect tubes according to the current size, the off time of this tube: off delay time td + closing drop time tf = 90ns + 35ns = 125ns, the off time is nanosecond level, which is much smaller than microsecond level. It can be controlled to turn off or turn on by MCU plus isolation and driving circuit.

[0038] In this embodiment, the current mutual inductance board: is an open loop Hall type current sensor module, which is an isolated current detection chip working on the principle of open loop Hall sensor detection. By introducing the current lead of the high voltage side into the package, based on the magnetic effect of current, the equal ratio magnetic field generated around the measured lead is aggregated through the magnetic core, and then inducted by the magnetic sensor of the built-in chip, and converted into a processable equal ratio voltage signal. This voltage signal is read and amplified by the built-in high-precision ADC, and combined with digital calibration technology to remove environmental variables such as temperature, noise, hysteresis and non-linearity, and finally output a voltage value that is nearly ideally proportional to the measured current value, realizing isolated current measurement. The final output voltage value Vout is nearly ideally proportional to the measured current value, Vout = module power supply VCC / 2 + 6.6mV*IP (current flowing through the firewire).

[0039] In this embodiment, the filter following module: the voltage value Vout needs to be filtered by capacitor, the capacitor value should not be too large, in order to increase the driving capacity, through the follower circuit and capacitor filtering, output to the AD sampling pin of MCU.

[0040] In this embodiment, the AD sampling module: adopts 12-bit, 1μs converter MCU ADC sampling, reasonably sets the sampling period, for example: the minimum 1.5 period of the ADC programmable channel sampling time is selected, and the ADC clock frequency is 15KHz. Then the ADC sampling period is 100us / 1.5 = 66us per period, and 15 points are sampled in one period.

[0041] In the embodiment, the control module: ADC gets the sampling value, gets the real AC voltage value through value*(VCC / 4096), then calculates the square sum, takes the average and gets the effective value t_value, compares t_value with the set maximum allowable current value, and when t_value is greater than the maximum allowable current value, the IO port of the MCU gives a level. Meanwhile, the MCU collects the current switch heat dissipation temperature through the temperature sensor, starts the fan for heat dissipation according to the temperature setting.

[0042] In the embodiment, the isolation driving part: the middle circuit part of the MCU driving field effect tube, which is a low-voltage weak current part on one side and a 220V strong current part on the other side, so the two circuits need to be isolated. Here, a special photoelectric isolation driving chip circuit is used, which can play the role of photoelectric isolation and driving control of the conduction and closing of the field effect tube. The propagation delay of light here is tp=190ns, and the control closing time is tf=20ns.

[0043] In the embodiment, the power supply: provides the required DC power supply for the above-mentioned functional modules.

[0044] In the embodiment, the switching device further includes an output protection unit, which plays a protective role when the output transient voltage is too high through a transient voltage suppression diode. Through an RC absorption circuit, the self-induced electromotive force during current transients is clamped, and the impact of voltage mutation caused by the conduction or closing of the AC voltage output on the field effect tube is suppressed.

[0045] In structure, it is composed of three circuit boards. The main circuit board 1 bears a current of up to 200A, so it has a special design in structure. The bottom surface has no device, but a large area of bare copper with tin (bare copper layer 12). The copper row is added to the large current part. The field effect tube is installed on both sides of the heat sink 8. The heat sink 8 is provided with a cooling fan 9 at both ends. The heat sink 8 is a wind tunnel with left-in and right-out, which plays a good heat dissipation effect. This part is on the right side of the main circuit board 1. The fire zero line input interface 10 is on the front side, and the fire zero line output interface 11 is on the back side. The power supply 5 is in the middle. The control circuit board 3 (including filtering and following, AD sampling and control) is on the power supply 5. The current mutual inductance board 2 is a separate circuit, which is connected to the main circuit board 1 through the four-pin and five-pin modules on the back side of the main circuit board 1 and connected to the control circuit board 3 through the socket. This part not only realizes strong and weak current isolation, but also has good heat dissipation effect and good electromagnetic compatibility. The laminated structure effectively utilizes the space and reduces the size of the board.

[0046] In summary, this technology from the inductive current to the off current, all the time is (125+190+20) / 1000+66+83 (program running time) = 149.335 μs, to achieve microsecond level protection, this technology can be used in low voltage distribution line short circuit arc extinguishing protection and overload protection, can reasonably overcome the traditional circuit breaker, air switch and monitoring equipment exists short-circuit current, cut off short-circuit current time long, short-circuit arc spark big, and short service life and other drawbacks, when short-circuit fault occurs, can quickly limit short-circuit current to achieve arc extinguishing protection with microsecond level, can significantly reduce the electrical fire accidents, protect the safety of personnel and property in the use of place.

[0047] Related applications:

[0048] As shown in Figure 6 ,

[0049] 1, this technology is used with intelligent circuit breaker, intelligent circuit breaker is connected to the back end of this circuit fire zero output, communication through 485, when short circuit arc extinguishing protection and overload protection occurs, this circuit first off with microsecond level, and then through the 485 interface to the intelligent circuit breaker sends the trip command, the intelligent circuit breaker is tripped off, and then the circuit automatically recovers to conduction, when the line short circuit or overload returns to normal, can be sent through the intelligent micro break remote on, restore normal power supply, at the same time, using intelligent micro break can real-time accurate collection of line voltage, current, leakage current, line temperature, active power, line power consumption collection, automatic report every hour / day / month.

[0050] As shown in Figure 7 ,

[0051] 2, this technology is used with single-phase intelligent safety power device, single-phase intelligent safety power device can solve the problem of phase line to ground leakage and fire, this technology can solve the problem of phase line (fire zero line) short circuit arc extinguishing protection and overload protection. The 220V output of the intelligent safety power device is connected to the input of this technology. Through combination, phase line (zero, fire line) short circuit, overload protection and phase line to ground short circuit protection are realized, which effectively prevents the occurrence of electrical fire.

[0052] As shown in Figure 8 ,

[0053] 3, this technology combines 4G technology and cloud technology, uploads data to cloud server, and can realize remote query, setting and control. MCU communication interface communicates with 4G module, 4G module uploads data to cloud server or sends instructions to 4G module through cloud server, 4G module communicates with MCU and executes corresponding operation.

[0054] As shown in Figure 9 ,

[0055] 4、This technology increases display screen and button, can man-machine interaction, through screen can display data and working state, button can set parameter, bring better visual and operation experience to user, can set protection current value according to line current size, let protection be more accurate and timely.

[0056] The above embodiments only describe the preferred embodiments of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical scheme of the utility model made by the ordinary engineering technicians in the art without departing from the design spirit of the utility model shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A current switch device for zero fire line protection, characterized in that: It comprises a main circuit board, a current mutual inductance board, a control circuit board, an isolation driving part, a power supply, a current switch and a heat dissipation mechanism; the main circuit board is respectively provided with the current mutual inductance board, the control circuit board, the isolation driving part, the power supply, the current switch and the heat dissipation mechanism; the power supply is arranged at one end of the main circuit board, the control circuit board is arranged on the top surface of the power supply, the heat dissipation mechanism is arranged at the other end of the main circuit board, the current mutual inductance board and the isolation driving part are respectively arranged on both sides of the heat dissipation mechanism, the heat dissipation mechanism comprises a radiator and a heat dissipation fan, the heat dissipation fans are installed at both ends of the radiator, and the current switch is arranged on the front and rear surfaces of the radiator.

2. A current switching device for zero line fault protection according to claim 1, characterized in that: The switch device further comprises a fire zero line input interface and a fire zero line output interface, and the fire zero line input interface and the fire zero line output interface are fixedly installed on the top surface of the main circuit board; the fire zero line input interface and the fire zero line output interface are arranged at the front and rear ends of the power supply respectively.

3. A current switching device for zero line fault protection according to claim 2, characterized in that: The main circuit board is electrically connected with the current mutual inductance board, the control circuit board, the isolation driving part and the power supply respectively, the control circuit board is electrically connected with the heat dissipation fan, the current switch, the current mutual inductance board and the isolation driving part respectively, the current mutual inductance board is electrically connected with the current switch, the fire zero line output interface is electrically connected with the current mutual inductance board, the fire zero line input interface is electrically connected with the current switch, and the power supply is electrically connected with the fire zero line input interface, the main circuit board, the current mutual inductance board, the control circuit board, the isolation driving part, the current switch and the heat dissipation fan respectively.

4. A current switching device for zero line fault protection according to claim 3, characterized in that: The radiator is a finned radiator, and the current switch is in contact connection with the fins on the radiator.

5. A current switching device for zero line fault protection according to claim 4, characterized in that: The control circuit board is further provided with a filter following module, an AD sampling module and a control module.

6. A current switching device for zero line fault protection according to claim 5, characterized in that: The heat dissipation fan is fixed on the radiator in a clamping or inserting mode.

7. A current switching device for zero line fault protection according to claim 6, characterized in that: The bottom surface of the main circuit board is fixedly installed with a bare copper layer.

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