Turntable cabin pressing automatic turn-off circuit

Abstract

An automatic turn-off circuit for rotary table cabin pressing relates to the technical field of rotary tables, and is characterized in that when an air pressure value in a rotary table cabin is lower than a set pressure, a voltage value detected by a voltage detection chip is smaller than a reference voltage value, the voltage detection chip outputs a low-level signal, a diode at the input end of a photoelectric coupler is cut off, and a triode at the output end of the photoelectric coupler is cut off; the drain electrode and the source electrode of the field effect transistor are conducted, and the inflation valve is powered on and works normally. When the internal air pressure value of the rotary table cabin reaches the set pressure, the voltage value detected by the voltage detection chip is larger than the reference voltage value, the voltage detection chip outputs a high-level signal, a diode at the input end of the photoelectric coupler is conducted, a triode at the output end of the photoelectric coupler is conducted, the drain electrode and the source electrode of the field effect transistor are in a cut-off state, and the inflation valve is powered off and stops working. The voltage detection chip is used for detection and timely power-off, and equipment damage caused by the fact that the air pressure value of the rotary table cabin does not meet the requirement is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of turntables, in particular to a turntable cabin pressure automatic shut-off circuit. Background Art

[0002] The application of PTZ in the field of monitoring is becoming more and more extensive, including coastal defense monitoring, high mountain forest fire prevention, anti-drone tracking, airport protection and other fields. These special use environments indicate the importance of turntable stability. Once the turntable is not airtight and water ingress is caused, it is very easy to cause safety accidents such as short circuits. Therefore, there are strict requirements for the airtightness test of the turntable before it leaves the factory. The airtightness test of the turntable is to inflate the air into the turntable through the inflation valve to make the air pressure reach the set value, and then perform a pressure maintenance test. During the inflation process of the turntable, the operator cannot accurately judge whether the internal air pressure of the turntable meets the specified requirements. According to experience, closing the inflation device can easily cause the internal air pressure of the turntable to be too high or too low. Summary of the invention

[0003] In order to overcome the deficiencies of the above technologies, the utility model provides a circuit which detects through a pressure sensing chip and cuts off the power in time, thereby preventing the air pressure value of the turntable cabin from failing to meet the requirement and thus damaging the equipment.

[0004] The technical solution adopted by the utility model to overcome the technical problems is:

[0005] A turntable cabin pressure automatic shut-off circuit, comprising:

[0006] The air pressure sensor is arranged inside the turntable cabin, with its GND pin connected to the ground, its VDD pin connected to the cathode of diode I, and the anode of diode I connected to the 5V power supply and the ground;

[0007] The voltage detection chip, whose In1- pin is connected to the Vout pin of the air pressure sensor, whose VCC- pin is grounded, whose VCC+ pin is connected to the 5V power supply, whose In1+ pin is respectively connected to the 1 pin and the 2 pin of the reference voltage chip, whose 2 pin of the reference voltage chip is respectively connected to the 5V power supply and the ground via the capacitor III via the resistor II, and whose 3 pin of the reference voltage chip is grounded;

[0008] The photocoupler has a cathode at its input end connected to ground, an anode at its input end connected to the Vout1 pin of the voltage detection chip via a resistor IV, a collector at its output end connected to a 12V power supply, an emitter at its output end connected to one end of a resistor V, the other end of the resistor V connected to ground and to the gate of the field effect tube via a resistor VI, the source of the field effect tube connected to ground, and the drain connected to the power supply end of the inflation valve.

[0009] Furthermore, it also includes a capacitor I, one end of which is connected to the VDD pin of the air pressure sensor, and the other end of which is grounded.

[0010] Furthermore, it also includes an LED lamp I, whose positive electrode is connected to a 5V power supply and a positive electrode of a diode I respectively through a resistor I, and whose negative electrode is grounded.

[0011] Preferably, the voltage detection chip is a GZP6895A050KP voltage detection chip.

[0012] Furthermore, the cathode of capacitor II and diode II connected in parallel to each other is connected to the VDD pin of the air pressure sensor, and the anode thereof is connected to the In1- pin of the voltage detection chip.

[0013] Furthermore, it also includes capacitor IV and capacitor V, one end of capacitor IV is connected to the VCC+ pin of the voltage detection chip, and the other end thereof is grounded, and one end of capacitor V is grounded, and the other end thereof is connected to the In1- pin of the voltage detection chip.

[0014] Preferably, the reference voltage chip is a TL431 reference voltage chip.

[0015] Furthermore, it also includes a resistor III and a capacitor VI, the In1- pin of the voltage detection chip is connected to the 1 pin of the reference voltage chip via the resistor III, one end of the capacitor VI is grounded, and the other end is connected to the In1- pin of the voltage detection chip.

[0016] Preferably, the field effect tube is a HY3215 field effect tube.

[0017] Furthermore, it also includes an LED lamp II, whose positive electrode is connected to the drain of the field effect tube, and whose negative electrode is connected to the power supply end of the inflation valve via a resistor VII.

[0018] The beneficial effects of the utility model are as follows: when the air pressure value inside the turntable cabin is lower than the set pressure, the voltage value detected by the voltage detection chip is lower than the reference voltage value, the voltage detection chip outputs a low-level signal, the diode at the input end of the photocoupler is cut off, the transistor at its output end is cut off, the drain and source of the field effect tube are turned on, and the inflation valve is powered on and works normally. When the air pressure value inside the turntable cabin reaches the set pressure, the voltage value detected by the voltage detection chip is greater than the reference voltage value, the voltage detection chip outputs a high-level signal, the diode at the input end of the photocoupler is turned on, the transistor at its output end is turned on, the drain and source of the field effect tube are in a cut-off state, and the inflation valve is powered off and stops working. The voltage detection chip detects and powers off the power in time to avoid the turntable cabin air pressure value failing to meet the requirements and thus damaging the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a circuit structure diagram of the utility model;

[0020] In the figure, 1. Resistor I 2. LED lamp I 3. Diode I 4. Capacitor I 5. Air pressure sensor 6. Capacitor II 7. Diode II 8. Resistor II 9. Capacitor III 10. Reference voltage chip 11. Voltage detection chip 12. Capacitor IV 13. Capacitor V 14. Resistor III 15. Capacitor VI 16. Resistor IV 17. Photocoupler 18. Resistor V 19. Resistor VI 20. Field effect tube 21. LED lamp II 22. Resistor VII 23. Inflatable valve. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1 The utility model is further described.

[0022] A turntable cabin pressure automatic shutdown circuit comprises: an air pressure sensor 5, which is arranged inside the turntable cabin, its GND pin is grounded, its VDD pin is connected to the cathode of a diode Ⅰ 3, and the anode of the diode Ⅰ 3 is respectively connected to a 5V power supply and ground; a voltage detection chip 11, its In1- pin is connected to the Vout pin of the air pressure sensor 5, its VCC- pin is grounded, its VCC+ pin is connected to a 5V power supply, its In1+ pin is respectively connected to pins 1 and 2 of a reference voltage chip 10, pin 2 of the reference voltage chip 10 is respectively connected to a 5V power supply and grounded via a resistor Ⅱ 8, and pin 3 of the reference voltage chip 10 is grounded; a photoelectric coupler 17, its input end cathode is grounded, its input end anode is connected to the Vout1 pin of the voltage detection chip 11 via a resistor Ⅳ 16, its output end collector is connected to a 12V power supply, and its output end emitter is connected to one end of a resistor Ⅴ 18, and resistor Ⅴ The other end of 18 is grounded through resistor VI 19 and connected to the gate of field effect tube 20. The source of field effect tube 20 is grounded, and its drain is connected to the power supply end of inflation valve 23. Inflating valve 23 works to inflate the inside of the turntable cabin. The air pressure sensor 5 measures the air pressure value in real time. The air pressure sensor 5 measures the signal input end of the voltage detection chip 11. At the same time, the reference voltage chip 10 generates a reference voltage which is also input into the voltage detection chip 11. Resistor II 8 plays a voltage stabilizing role, and capacitor III 9 plays a filtering role. When the air pressure value inside the turntable cabin is lower than the set pressure, the voltage value detected by the voltage detection chip 11 is lower than the reference voltage value. The voltage detection chip 11 outputs a low-level signal, the diode at the input end of the photoelectric coupler 17 is cut off, and the transistor at its output end is cut off. The drain and source of field effect tube 20 are turned on, and the inflation valve 23 is powered on and works normally. When the pressure inside the turntable cabin reaches the set pressure, the voltage detected by the voltage detection chip 11 is greater than the reference voltage, the voltage detection chip 11 outputs a high-level signal, the diode at the input end of the photocoupler 17 is turned on, the transistor at the output end is turned on, the drain and source of the field effect tube 20 are in a cut-off state, and the inflation valve 23 is powered off and stops working. The voltage detection chip 11 detects and powers off in time to avoid the turntable cabin pressure value failing to meet the requirements and thus damaging the equipment.

[0023] In one embodiment of the utility model, a capacitor I 4 is also included, one end of which is connected to the VDD pin of the air pressure sensor 5, and the other end of which is grounded. The capacitor I 4 plays a filtering role, making the circuit more stable and reliable.

[0024] In one embodiment of the utility model, an LED lamp Ⅰ 2 is also included, whose positive electrode is connected to the positive electrode of the 5V power supply and the diode Ⅰ 3 respectively through the resistor Ⅰ 1, and its negative electrode is grounded. When the air pressure sensor 5 works normally, the LED lamp Ⅰ 2 is on, and when the air pressure sensor 5 does not work, the LED lamp Ⅰ 2 is off, which plays an indicating role. The resistor Ⅰ 1 plays a current limiting role to protect the LED lamp Ⅰ 2 from being damaged.

[0025] In one embodiment of the present invention, the voltage detection chip 11 is a GZP6895A050KP voltage detection chip, the reference voltage chip 10 is a TL431 reference voltage chip, and the field effect tube 20 is a HY3215 field effect tube.

[0026] In one embodiment of the utility model, the capacitor II 6 and the diode II 7 connected in parallel are connected to the VDD pin of the air pressure sensor 5, and the positive electrode is connected to the In1- pin of the voltage detection chip 11. The capacitor II 6 plays a filtering role, and the diode II 7 plays a voltage stabilizing role, making the circuit more stable and reliable.

[0027] In one embodiment of the utility model, capacitor IV 12 and capacitor V 13 are also included, one end of capacitor IV 12 is connected to the VCC+ pin of the voltage detection chip 11, and the other end thereof is grounded, one end of capacitor V 13 is grounded, and the other end thereof is connected to the In1- pin of the voltage detection chip 11. Capacitor IV 12 plays a filtering role, which filters the power supply of the voltage detection chip 11, and capacitor V 13 plays a filtering role, which filters the input signal of the voltage detection chip 11.

[0028] In one embodiment of the utility model, a resistor III 14 and a capacitor VI 15 are also included. The In1-pin of the voltage detection chip 11 is connected to the 1-pin of the reference voltage chip 10 via the resistor III 14. One end of the capacitor VI 15 is grounded, and the other end is connected to the In1-pin of the voltage detection chip 11. The resistor III 14 can suppress signal noise, and the capacitor VI 15 plays a filtering role, which can make the reference voltage more stable.

[0029] In one embodiment of the utility model, an LED lamp II 21 is also included, whose positive electrode is connected to the drain of the field effect tube 20, and whose negative electrode is connected to the power supply end of the inflation valve 23 via the resistor VII 22. When the inflation valve 23 is powered on, the LED lamp II 21 is on, and when the inflation valve 23 is powered off and stops working, the LED lamp II 21 is off, which serves as a prompt.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A turntable cabin pressure automatic shut-off circuit, characterized in that: include: The air pressure sensor (5) is arranged inside the turntable cabin, the GND pin of the sensor is grounded, the VDD pin of the sensor is connected to the cathode of the diode I (3), and the anode of the diode I (3) is connected to a 5V power supply and to the ground; A voltage detection chip (11), wherein its In1- pin is connected to the Vout pin of the air pressure sensor (5), its VCC- pin is grounded, its VCC+ pin is connected to a 5V power supply, its In1+ pin is respectively connected to pins 1 and 2 of a reference voltage chip (10), pin 2 of the reference voltage chip (10) is respectively connected to the 5V power supply via resistor II (8) and to ground via capacitor III (9), and pin 3 of the reference voltage chip (10) is grounded; The photocoupler (17) has a cathode at its input end connected to ground, an anode at its input end connected to the Vout1 pin of the voltage detection chip (11) via a resistor IV (16), an output collector connected to a 12V power supply, an emitter at its output end connected to one end of a resistor V (18), the other end of the resistor V (18) connected to ground and connected to the gate of the field effect transistor (20) via a resistor VI (19), the source of the field effect transistor (20) connected to ground, and the drain connected to the power supply end of the inflation valve (23).

2. The automatic shut-off circuit for turning the turntable cabin under pressure according to claim 1 is characterized in that: It also includes a capacitor I (4), one end of which is connected to the VDD pin of the air pressure sensor (5) and the other end of which is grounded.

3. The automatic shut-off circuit for turning the turntable cabin under pressure according to claim 1 is characterized in that: It also includes an LED lamp Ⅰ (2), the positive electrode of which is connected to a 5V power supply and the positive electrode of a diode Ⅰ (3) via a resistor Ⅰ (1), and the negative electrode of which is grounded.

4. The automatic shut-off circuit for turning the turntable cabin under pressure according to claim 1 is characterized in that: The voltage detection chip (11) is a GZP6895A050KP voltage detection chip.

5. The turntable cabin pressure automatic shut-off circuit according to claim 1 is characterized in that: It also includes a capacitor II (6) and a diode II (7) connected in parallel with each other, the cathode of which is connected to the VDD pin of the air pressure sensor (5), and the anode of which is connected to the In1- pin of the voltage detection chip (11).

6. The turntable cabin pressure automatic shut-off circuit according to claim 1 is characterized in that: It also includes a capacitor IV (12) and a capacitor V (13), one end of the capacitor IV (12) is connected to the VCC+ pin of the voltage detection chip (11), and the other end thereof is grounded, and one end of the capacitor V (13) is grounded, and the other end thereof is connected to the In1- pin of the voltage detection chip (11).

7. The automatic shut-off circuit for turning platform cabin under pressure according to claim 1 is characterized in that: The reference voltage chip (10) is a TL431 reference voltage chip.

8. The turntable cabin pressure automatic shut-off circuit according to claim 1 is characterized by: It also includes a resistor III (14) and a capacitor VI (15), wherein the In1-pin of the voltage detection chip (11) is connected to the 1-pin of the reference voltage chip (10) via the resistor III (14), and one end of the capacitor VI (15) is grounded, and the other end thereof is connected to the In1-pin of the voltage detection chip (11).

9. The automatic shut-off circuit for turning platform cabin under pressure according to claim 1 is characterized in that: The field effect tube (20) is a HY3215 field effect tube.

10. The turntable cabin pressure automatic shut-off circuit according to claim 1, characterized in that: It also includes an LED lamp II (21), the positive electrode of which is connected to the drain of the field effect tube (20), and the negative electrode of which is connected to the power supply end of the inflation valve (23) via a resistor VII (22).

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