CN203826922U - An intelligent air switch device - Google Patents

Abstract

The utility model relates to an air switch device, which belongs to the technical field of power supply control. The device includes an air switch connected in series in the live wire to control on-off and a motor module that drives the air switch to switch between on and off. terminal, the signal output terminals of the front and rear voltage and current modules are respectively connected to the corresponding signal input terminals of the micro-processing chip, and the control output terminal of the micro-processing chip is connected to the controlled terminal of the motor drive module through the drive module, The wireless communication terminal and the display communication terminal of the micro-processing chip are respectively connected to the wireless communication module and the touch display screen. After adopting the utility model, control parameters such as self-recovery and protection value can be conveniently changed as required, and can be controlled through networking, thereby greatly improving the reliability of power supply.

Description

Intelligent air switch device

technical field

The utility model relates to a switch, in particular to an air switch device, which belongs to the technical field of power supply control.

Background technique

The air switch is a low-voltage switch with air as the insulating medium, manual or electric closing, the lock retaining the closing position, tripping by the tripping mechanism and an arc extinguishing device. It is widely used in AC and DC devices below 500V. In the circuit, it plays the role of connecting, breaking and carrying rated working current and fault current such as short circuit and overload. When an overload, short circuit, voltage drop or disappearance occurs in the circuit, the air switch can automatically cut off the circuit to achieve the required protection. For a long time, in the low-voltage power distribution network below 500V, the traditional low-voltage switch combined with the lock and release has been used to realize the automatic switching circuit. However, with the use of more and more nonlinear equipment such as frequency converters and induction cookers, the number of nonlinear loads has increased rapidly, resulting in a large number of harmonics, voltage flicker, sags and other problems in the low-voltage distribution network, making low-voltage The number of misoperations of air switches in the distribution network has increased significantly, seriously affecting the reliability of power supply.

The search found that the Chinese Utility Model Patent Application No. 201210342670.2 discloses an intelligent air switch system. In this system, the PLC meter is connected to the input end of the air switch, and the output end of the air switch is connected to the PLC module; the PLC meter is used for recording. electricity information, and send electricity information to the PLC module through the air switch; the PLC module is also connected to the main processor to receive the electricity information, and send the electricity information to the main processor; the main processor is also connected to the display module, with The power consumption information is processed, and the processing result is sent to the display module for display. The air switch system integrates the PLC module, the main processor and the display module on the existing air switch, without the need for complicated installation, it is convenient for the user to know the electricity consumption information in time, so as to use electricity reasonably and save electricity .

In addition, the Chinese patent application number 201020137270.4 discloses a special air switch for smart electric energy meters, which consists of a moving contact (3) with an arc extinguishing cover, an overcurrent protection thermal relay (4), a short circuit protection coil (7), a disconnector Buckle mechanism (5), tripping coil (6), piezoresistor (2), leakage detection coil (8), leakage test button (14), return spring (1), low-pass filter (9), bidirectional The silicon controlled silicon (13) and the Zener diode (12) are formed. The protection device of the special air switch includes a high-frequency filter circuit composed of a Γ-shaped low-pass filter composed of LC; a leakage protection circuit composed of a leakage detection coil and a tripping coil; an overcurrent protection circuit composed of a short circuit coil and an overcurrent protection thermal relay. Current protection and short circuit protection circuit; overvoltage protection circuit composed of bidirectional thyristor and Zener diode; lightning protection circuit composed of varistor.

However, the applicant believes that the above-mentioned existing technologies have problems such as self-recovery, protection value and other control parameters that are difficult to change and cannot participate in networking. The revision of the control threshold cannot be adjusted independently as appropriate, resulting in unsatisfactory reliability of power supply control.

Contents of the invention

The purpose of this utility model is to propose an intelligent air switch device that can conveniently input control parameters on demand, can participate in networking, and has high power supply reliability in view of the problems existing in the above-mentioned prior art.

In order to achieve the above purpose, the intelligent air switch device of the present utility model mainly includes an air switch connected in series in the live wire to control on-off and a motor module that drives the air switch to perform on-off switching. There are signal acquisition terminals of the front and rear voltage and current modules, the signal output terminals of the front and rear voltage and current modules are respectively connected to the corresponding signal input terminals of the microprocessing chip, and the control output terminals of the microprocessing chip are driven by The module is connected to the controlled end of the motor drive module, and the wireless communication end and display communication end of the micro-processing chip are respectively connected to the wireless communication module and the touch display screen.

The intelligent air switch of the utility model has the following functions:

1 Open circuit control function: through the front and rear voltage and current sampling modules, the voltage and current signal values of the upper and lower stages of the air switch can be obtained, and sent to the micro-processing chip to realize when the current value is higher than the set overcurrent value or the voltage value is low. If the undervoltage value is lower than the set value, a signal is sent to the drive module, the drive motor module disconnects the air switch, and the display screen shows that the air switch is disconnected, and the current air switch is disconnected and disconnected to the upper system through the wireless communication module. The voltage and current instantaneous value signal collected by the voltage and current sampling module before opening.

2 Networking upper-level system and self-recovery power supply function: When the upper-level system analyzes the voltage and current before disconnection and finds that the voltage and current are within the safe range, it sends a recovery power supply signal, transmits it to the micro-processing chip, and then drives the motor through the drive module module, incorporating an air switch, to restore power. After analyzing the voltage and current before disconnection, it is found that the voltage and current do not belong to the safe range, then return the signal to the wireless communication module, and after the micro-processing chip receives it, keep the air switch disconnected, and display the fault information on the touch display screen , prompting for manual exclusion.

3 Operable power supply recovery function: when the touch display screen is operated to perform power supply recovery operation, a signal can be sent to the micro-processing chip, so that it can drive the motor module combined with the air switch to restore power supply through the drive module.

Therefore, after adopting the utility model, control parameters such as self-recovery and protection value can be conveniently changed as required, and can be controlled through networking, greatly improving the reliability of power supply.

Further, the transformer leading out from the front section of the air switch passes through a single-phase rectifier, and outputs direct current to the power switch and the backup battery module respectively, and the backup battery is connected to the power terminal of the micro-processing chip through the power chip. The motor module has first and second power terminals, and the first and second power terminals are respectively connected to the single-phase rectifier and the backup battery module.

Still further, the power selection control terminal of the micro-processing chip is connected to the power selection controlled terminal of the power switch.

Description of drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the utility model.

The labels in the figure represent: 1. Air switch; 2. Power switch; 3. Front voltage and current acquisition module (DAM-3505/T type, sold by Beijing Altai Technology Development Co., Ltd.); 4. Transformer; 5. Single Phase rectifier; 6. Spare battery; 7. Power chip; 8. Motor module; 9. Driver module (Qixingworm L298N type); 10. TMS320F2812 chip; 11. GPRS and WIFI module; 12. Touch display screen; 13. The rear voltage and current acquisition module.

Detailed ways

In order to deepen the understanding of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

The intelligent air switch device shown in Figure 1 mainly includes an air switch 1 connected in series in the live wire to control on-off and a motor module 8 that drives the air switch for on-off switching. The front and rear circuits of the air switch 1 are respectively provided with the signal acquisition terminals of the front voltage and current module 3 and the rear voltage and current module 13, and the signal output terminals of the front and rear voltage and current modules 3 and 13 are respectively connected to the TMS320F2812 micro The corresponding signal input terminals ADCINA0-7, ADCINB0-7 of the processing chip 10, and the control output terminals PWM1-6 of the micro-processing chip 10 are connected to the controlled end of the motor drive module 8 through the drive module 9, thereby controlling the switching action of the air switch 1. The wireless communication end SCI port of microprocessing chip 10 is connected as GPRS and WIFI module 11 of wireless communication module, and its display communication end I/O port is connected touch display screen 12, and touch display screen adopts NT31C-ST142 (B)-V2 model Highly functional touch screen.

In addition, the 220V/5V transformer 4 drawn from the front section of the air switch 1 passes through the single-phase rectifier 5, and then outputs direct current into the power switch 2 and the backup battery module 6, and the backup battery 6 is connected to the power terminal of the TMS320F2812 microprocessing chip 10 through the power chip 7 , to power it. The motor module 8 has first and second power supply terminals, the first and second power supply terminals are respectively connected to the single-phase rectifier 5 and the backup battery module 6, and the power selection control terminal PWM7-12 of the TMS320F2812 microprocessing chip 10 is connected to the power supply of the power switch 2 Select the controlled end to control the switch to be powered by the single-phase rectifier 5 or the backup battery module 6 to ensure its reliable operation. The power switch 2 of this embodiment is a single-pole three-throw switch.

When working, the voltage and current sampling module 313 obtains the upper and lower voltage and current signal values of the switch 1, and sends them to the TMS320F2812 chip 10, so that when the current value is higher than the set overcurrent value or the voltage value is lower than the set undervoltage value, then Turn off the switch 1, and display on the touch display screen 12 that the air switch has been disconnected, and then send the current air switch to the upper system through the GPRS and WIFI module 11 and the instantaneous voltage and current collected by the voltage and current sampling module 313 before disconnection value signal.

When the touch display screen 12 is operated and the power supply recovery operation is clicked, the touch display screen 12 sends a signal to the TMS320F2812 chip 10, and the TMS320F2812 chip 10 outputs a signal, operates the drive module 9, drives the motor module 8, merges the switch 1, and restores power supply.

When the upper system analyzes the voltage and current before the disconnection, it is found that the voltage and current are within the safe range, and then the power supply recovery signal is sent within 2s. After receiving the signal, the GPRS and WIFI module 11 transmits it to the TMS320F2812 chip 10, and the TMS320F2812 chip 10 output signal, operate the drive module 9, drive the motor module 8, merge the switch 1, and restore the power supply. After analyzing the voltage and current before disconnection, it is found that the voltage and current do not belong to the safe range, then the return signal is sent to the GPRS and WIFI module 11, transmitted to the TMS320F2812 chip 10, the merge switch 1 is not executed, and the display is displayed on the touch display screen 12 "There is a fault that needs to be rectified manually" is displayed.

When the upper-level system cannot be connected, the system will compare the voltage and current data of the last restored power supply. If the data is less than the last time, it will try to restore the power supply after 10s. The TMS320F2812 chip 10 outputs signals to operate the drive module 9 and drive the motor module 8 , merge switch 1, restore power supply. When the voltage and current suddenly increase above the limit value within 100ms after the power supply is restored, the TMS320F2812 chip 10 outputs a signal, operates the drive module 9, drives the motor module 8, disconnects the switch 1, and transmits to the touch display screen 12. The signal "there is a fault needs to be manually eliminated" is transmitted with the WIFI module 11, and sent to the superior system.

By operating the touch display screen 12, the overcurrent value and the undervoltage value are set. Or set the overcurrent value and undervoltage value in the upper system, and then transmit them to the TMS320F2812 chip 10 through the GPRS and WIFI module 11 .

In addition, when the voltage and current sampling modules 3 and 13 respectively obtain the upper and lower voltage and current signal values of the air switch 1 and send them to the TMS320F2812 chip 10, when the voltage and current sampling module 3 has voltage and current signals, the TMS320F2812 chip 10 is controlled by the PWM7- 12 The output signal controls the power switch 2 to connect the single-phase rectifier 5 and the motor module 8 . When the voltage and current sampling module 3 has no voltage and current signals, the TMS320F2812 chip 10 controls the power switch 2 to connect the backup battery 6 and the motor module 8 through the output signal of the PWM7-12. At the same time, because the TMS320F2812 controls the power switch 2 through the PWM port output, it can realize the blocking protection of the line: when the upper line is powered off, the front voltage and current acquisition module 3 does not collect the signal, and if there is a distributed power supply in the home network, And it is generating electricity, so that the lines in the home network have electricity, then the rear voltage and current acquisition module 13 collects the signal and returns it, and the micro-processing chip will directly output the signal through the PWM port, and turn off the power switch 2 to ensure that no errors caused by misoperation occur. Abnormal reverse power transmission accident.

It can be seen that after adopting the hardware circuit of the intelligent air switch device of this embodiment, the power supply control function is more perfect and reliable, and has the following advantages:

1. The operating limit of the system can be easily changed by inputting from the network or touch screen. It has the function of self-recovery after power failure, and can automatically adjust the power-off limit according to the perennial power-off data;

2. Since the motor module is controlled by the motor drive module, the switch lock to prevent abnormal reverse power transmission can be realized;

3. The use of the motor module makes the operation speed faster, the service life is longer, and the maintenance is more convenient;

4. The setting of WIFI and GPRS network interface conveniently realizes the network data transmission and control of the intelligent air switch.

Claims (4)

1. an intelligent air switching device, comprise being connected on and in live wire, control the air switch of break-make and the motor module that drives air switch to carry out break-make switching, it is characterized in that: the signals collecting end that is respectively equipped with preposition and rearmounted electric current and voltage module in the leading portion of described air switch and back segment circuit, described signal output part preposition and rearmounted electric current and voltage module connects respectively the corresponding signal input of micro-chip processor, the control output end of described micro-chip processor connects the controlled end of described motor drive module by driver module, the wireless telecommunications end of described micro-chip processor and demonstration communication terminal connect respectively wireless communication module and touch display screen curtain.

2. intelligent air switching device according to claim 1, it is characterized in that: the transformer that described air switch leading portion is drawn is after single-phase rectifier, export respectively direct current and enter mains switch and reserve battery module, described reserve battery connects the power end of described micro-chip processor by power supply chip, motor module has the first and second power ends, and described the first and second power ends connect respectively single-phase rectifier and reserve battery module.

3. intelligent air switching device according to claim 2, is characterized in that: the power supply of described micro-chip processor selects the power supply of controlling termination mains switch to select controlled end.

4. intelligent air switching device according to claim 3, is characterized in that: described mains switch is SP3T switch.