Circuit for switching power supply modes of holder

Abstract

A power supply mode switching circuit for a holder relates to the technical field of holders, and is characterized in that when the electric quantity of a storage battery is insufficient, the output end of a voltage comparator II outputs a low level, the output end of a voltage comparator I outputs a high level, a triode II is cut off, a triode I is conducted, a PMOS tube II is cut off, the storage battery does not supply power to the holder, and the PMOS tube I is conducted; and the holder is powered by the self-distribution power supply line for the holder. When the storage battery is fully charged, the output end of the voltage comparator I outputs a high level, the output end of the voltage comparator II outputs a low level, the triode II is switched on, the triode I is switched off, the PMOS tube I is switched off, the holder cannot be powered by the self-configured power supply line, the PMOS tube II is switched on, and the storage battery supplies power to the holder. Automatic switching between power supply of the storage battery and power supply of the self-distribution power supply line for the holder is achieved, manual operation is not needed, and arrangement of the holder in the field environment is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of gimbal technology, specifically to a circuit for switching the power supply mode of a gimbal. Background Technology

[0002] During use, pan-tilt units (PTZs) may employ different power supply methods. For example, they may be powered by their own power supply cable, a battery, or other methods. In certain environments, such as when the PTZ is mounted on a substation intelligent inspection vehicle, the entire vehicle's equipment is powered by a battery. However, since the battery's capacity is limited and it doesn't continuously supply power, when the battery is insufficient to meet the vehicle's equipment needs, and the PTZ and its onboard monitoring equipment cannot be powered off, the PTZ's own power supply cable is required to charge the battery. Furthermore, if the PTZ is installed indoors, the power supply method can be manually switched between the self-provided power supply cable and the battery; however, if installed in an outdoor environment, it's impractical for personnel to frequently switch between these two power supply methods. Summary of the Invention

[0003] In order to overcome the shortcomings of the above technologies, this utility model provides a circuit that automatically switches between battery power supply and power supply from a self-contained power cable for the gimbal.

[0004] The technical solution adopted by this utility model to overcome its technical problem is:

[0005] A circuit for switching power supply modes of a gimbal, characterized in that it includes:

[0006] Voltage comparator I, its positive input terminal is connected to the self-supply power supply line for the pan-tilt unit and ground respectively, its VCC terminal is connected to the power supply VCC, and its ground terminal is grounded;

[0007] Voltage comparator II has its positive input terminal connected to the positive input terminal of voltage comparator I, and its negative input terminal connected to the negative input terminal of voltage comparator I, the battery, and ground, respectively.

[0008] Transistor I, its base is connected to the output of voltage comparator I, its emitter is grounded, and its collector is connected to the self-supplied power supply line for the gimbal;

[0009] Transistor II has its base connected to the output of voltage comparator II, its emitter grounded, and its collector connected to the battery.

[0010] PMOS transistor I, its gate is connected to the collector of transistor I, its source is connected to the self-supply power supply line for the gimbal, and its drain is connected to the power input terminal of the gimbal; and

[0011] PMOS transistor II has its gate connected to the collector of transistor II, its source connected to the battery, and its drain connected to the power input terminal of the gimbal.

[0012] Furthermore, the positive input terminal of the voltage comparator I is connected to the self-supply power supply line of the pan-tilt unit via resistor I and grounded via resistor II, and the negative input terminal of the voltage comparator II is connected to the battery via resistor III and grounded via resistor IV.

[0013] Furthermore, both transistor I and transistor II are NPN type transistors.

[0014] Furthermore, it also includes resistors V and VI. One end of resistor V is connected to the output terminal of voltage comparator I, and the other end is connected to the VCC terminal of voltage comparator I. One end of resistor VI is connected to the output terminal of voltage comparator II, and the other end is connected to the VCC terminal of voltage comparator II.

[0015] Furthermore, it also includes resistors VII, VIII, IX, and X. The base of transistor I is connected to the output of voltage comparator I via resistor VII. One end of resistor IX is connected to the emitter of transistor I, and the other end is connected to the base of transistor I. The base of transistor II is connected to the output of voltage comparator II via resistor VIII. One end of resistor X is connected to the emitter of transistor II, and the other end is connected to the base of transistor II.

[0016] Furthermore, it also includes resistors XI and XII. The collector of transistor I is connected to the self-supplied power supply line for the gimbal via resistor XI, and the collector of transistor II is connected to the battery via resistor XII.

[0017] Furthermore, it also includes a Schottky diode I, a resistor XIII, and a resistor XIV. The positive terminal of the Schottky diode I is connected to the gate of the PMOS transistor I via the resistor XIII, and the negative terminal of the Schottky diode I is connected to the collector of the transistor I. One end of the resistor XIV is connected to the collector of the transistor I, and the other end is connected to the gate of the PMOS transistor I.

[0018] Furthermore, it also includes a Schottky diode II, a resistor XV, and a resistor XVI. The positive terminal of the Schottky diode II is connected to the gate of the PMOS transistor II via the resistor XV, and the negative terminal of the Schottky diode II is connected to the collector of the transistor II. One end of the resistor XVI is connected to the collector of the transistor II, and the other end is connected to the gate of the PMOS transistor II.

[0019] Furthermore, it also includes diode I, whose positive terminal is connected to the drain of PMOS transistor I via fuse I, and whose negative terminal is connected to the power input terminal of the gimbal.

[0020] Furthermore, it also includes diode II, whose positive terminal is connected to the drain of PMOS transistor II via fuse II, and whose negative terminal is connected to the power input terminal of the gimbal.

[0021] The beneficial effects of this invention are as follows: When the battery power is insufficient, the output of voltage comparator II will output a low level, and the output of voltage comparator I will output a high level. At this time, transistor II is cut off and transistor I is turned on. PMOS transistor II is turned off, and the battery will no longer supply power to the gimbal. PMOS transistor I is turned on, and the gimbal is powered by its own power supply line. When the battery is fully charged, the output of voltage comparator I will output a high level, and the output of voltage comparator II will output a low level. At this time, transistor II is turned on, transistor I is cut off, PMOS transistor I is turned off, and the gimbal is no longer powered by its own power supply line. PMOS transistor II is turned on, and the gimbal is powered by the battery. This achieves automatic switching between battery power and gimbal power supply via its own power supply line, eliminating the need for manual operation and facilitating the deployment of the gimbal in outdoor environments. Attached Figure Description

[0022] Figure 1 This is a circuit structure diagram of the present invention;

[0023] In the diagram, 1. Voltage comparator I 2. Voltage comparator II 3. Resistor I 4. Resistor II 5. Resistor III 6. Resistor IV 7. Resistor V 8. Resistor VI 9. Resistor VII 10. Resistor VIII 11. Resistor IX 12. Resistor X 13. Transistor I 14. Transistor II 15. Resistor XI 16. Resistor XII 17. Schottky diode I 18. Schottky diode II 19. Resistor XIII 20. Resistor XIV 21. Resistor XV 22. Resistor XVI 23. PMOS transistor I 24. PMOS transistor II 25. Fuse I 26. Fuse II 27. Diode I 28. Diode II. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 The present invention will be further described below.

[0025] A circuit for switching power supply modes of a gimbal, characterized in that it includes: a voltage comparator I 1, whose positive input terminal is connected to the gimbal's self-provided power supply line and ground, its VCC terminal is connected to the power supply VCC, and its ground terminal is grounded; a voltage comparator II 2, whose positive input terminal is connected to the positive input terminal of voltage comparator I 1, and its negative input terminal is connected to the negative input terminal of voltage comparator I 1, a battery, and ground; a transistor I 13, whose base is connected to the output terminal of voltage comparator I 1, its emitter is grounded, and its collector is connected to the gimbal's self-provided power supply line; a transistor II 14, whose base is connected to the output terminal of voltage comparator II 2, its emitter is grounded, and its collector is connected to the battery; a PMOS transistor I 23, whose gate is connected to the collector of transistor I 13, its source is connected to the gimbal's self-provided power supply line, and its drain is connected to the power input terminal of the gimbal; and a PMOS transistor II 24, whose gate is connected to transistor II 13. The collector of 14 has its source connected to the battery and its drain connected to the power input terminal of the gimbal. When the battery power is insufficient, the voltage at the negative input terminal of voltage comparator II 2 is lower than the set voltage. The voltage at the positive input terminal of voltage comparator II 2 is stably supplied by the gimbal's self-provided power supply line and will not decrease. As a result, the voltage at the negative input terminal of voltage comparator II 2 will be less than its positive input terminal voltage, and the output terminal of voltage comparator II 2 will output a low level. The output terminal of voltage comparator I 1 will output a high level. At this time, transistor II 14 is cut off and transistor I 11 is turned on. The collector voltage of transistor II 14 is close to the battery voltage, and the collector voltage of transistor I 11 is 0. The gate voltage and source voltage of PMOS transistor II 24 are the same. At this time, PMOS transistor II 24 is turned off, and the battery will no longer supply power to the gimbal. Meanwhile, the gate voltage of PMOS transistor I 23 is less than the source voltage, so PMOS transistor I 23 is turned on, and the gimbal is powered by the gimbal's self-provided power supply line. When the battery is fully charged, its voltage increases. The voltage at the negative input terminal of voltage comparator II 2 reaches the set voltage, while the voltage at its positive input terminal remains unchanged. This results in the negative input terminal voltage of voltage comparator II 2 being greater than the positive input terminal voltage. Voltage comparator I 1 outputs a high level, and voltage comparator II 2 outputs a low level. At this time, transistor II 14 is turned on, and transistor I 13 is turned off. The collector voltage of transistor II 14 is 0, and the collector voltage of transistor I 13 is close to the voltage of the self-supplied power supply line for the gimbal. The gate voltage and source voltage of PMOS transistor I 23 are the same. At this time, PMOS transistor I 23 is turned off, and the self-supplied power supply line for the gimbal no longer supplies power. The gate voltage of PMOS transistor II 24 is less than the source voltage, so PMOS transistor II 24 is turned on, and the battery supplies power to the gimbal. It should be noted that in actual use, appropriate parameters can be selected for each component in the circuit according to the specific application scenario to ensure reliable and stable operation of the circuit.It enables automatic switching between battery power and gimbal power via its own power cable, eliminating the need for manual operation and facilitating the deployment of the gimbal in outdoor environments.

[0026] In one embodiment of this invention, the positive input terminal of voltage comparator I1 is connected to the self-supply power supply line for the pan-tilt unit via resistor I3 and grounded via resistor II4. The negative input terminal of voltage comparator II2 is connected to the battery via resistor III5 and grounded via resistor IV6. Resistors I3 and II4 are both voltage divider resistors, used to provide a suitable voltage to the positive input terminals of voltage comparator I1 and voltage comparator II2. When comparing the voltages with the negative input terminals of voltage comparator I1 and voltage comparator II2, the output terminals of voltage comparator I1 and voltage comparator II2 can output high and low level changes. Resistors III5 and IV6 are both voltage divider resistors, used to provide a suitable voltage to the negative input terminals of voltage comparator I1 and voltage comparator II2. When comparing voltages with the positive input terminals of voltage comparator I1 and voltage comparator II2, they enable the output terminals of voltage comparator I1 and voltage comparator II2 to output high and low levels.

[0027] In one embodiment of this utility model, transistor I 13 and transistor II 14 are both NPN transistors.

[0028] In one embodiment of this invention, resistors V7 and VI8 are further included. One end of resistor V7 is connected to the output terminal of voltage comparator I1, and the other end is connected to the VCC terminal of voltage comparator I1. One end of resistor VI8 is connected to the output terminal of voltage comparator II2, and the other end is connected to the VCC terminal of voltage comparator II2. Resistors V7 and VI8 are both pull-up resistors, used to ensure a high output level, improve driving capability, enhance anti-interference capability, and reduce chattering problems.

[0029] In one embodiment of this utility model, resistors VII 9, VIII 10, IX 11, and X 12 are further included. The base of transistor I 13 is connected to the output of voltage comparator I 1 via resistor VII 9. One end of resistor IX 11 is connected to the emitter of transistor I 13, and the other end is connected to the base of transistor I 13. The base of transistor II 14 is connected to the output of voltage comparator II 2 via resistor VIII 10. One end of resistor X 12 is connected to the emitter of transistor II 14, and the other end is connected to the base of transistor II 14. Resistors VII 9 and VIII 10 are both base bias resistors, providing a suitable current to the bases of transistors I 13 and II 14 respectively, enabling transistors I 13 and II 14 to conduct. The function of resistors IX11 and X12 is to add a pull-down resistor to the base of transistor I 13 and transistor II 14 respectively. The purpose is to ensure that the capacitor between the base and emitter of transistors I 13 and II 14 discharges faster, thus speeding up the turn-off of the transistors. In addition, it is to ensure that the base of transistors I 13 and II 14 has a known logic state, preventing uncertainty in the operating state of the transistors when the control input is floating or configured high.

[0030] In one embodiment of this utility model, resistors XI 15 and XII 16 are further included. The collector of transistor I 13 is connected to the self-supply power supply cable for the gimbal via resistor XI 15, and the collector of transistor II 14 is connected to the battery via resistor XII 16. Resistors XI 15 and XII 16 are the collector bias resistors for transistor I 13 and transistor II 14, respectively.

[0031] In one embodiment of this utility model, it further includes a Schottky diode I 17, a resistor XIII 19, and a resistor XIV 20. The anode of the Schottky diode I 17 is connected to the gate of the PMOS transistor I 23 via the resistor XIII 19, and the cathode of the Schottky diode I 17 is connected to the collector of the transistor I 13. One end of the resistor XIV 20 is connected to the collector of the transistor I 13, and the other end is connected to the gate of the PMOS transistor I 23. The Schottky diode I 17 and the resistor XIII 19 are connected in series. The main function of the Schottky diode I 17 is to rapidly discharge the voltage between the gate and source of the PMOS transistor I 23 at the moment of turn-off, ensuring that the PMOS transistor I 23 turns off quickly. The function of the resistor XIII 19 is to prevent the PMOS transistor I 23 from burning out due to excessive turn-off current. The function of the resistor XIV 20 is twofold: first, to provide current limiting protection; and second, to eliminate the gate oscillation signal of the PMOS transistor I 23.

[0032] In one embodiment of this utility model, it further includes a Schottky diode II 18, a resistor XV 21, and a resistor XVI 22. The anode of the Schottky diode II 18 is connected to the gate of the PMOS transistor II 24 via the resistor XV 21, and the cathode of the Schottky diode II 18 is connected to the collector of the transistor II 14. One end of the resistor XVI 22 is connected to the collector of the transistor II 14, and the other end is connected to the gate of the PMOS transistor II 24. The Schottky diode II 18 and the resistor XV 21 are connected in series. The main function of the Schottky diode II 18 is to rapidly discharge the capacitance voltage between the gate and source of the PMOS transistor II 24 at the moment of turn-off, ensuring that the PMOS transistor II 24 turns off quickly. The function of the resistor XV 21 is to prevent the PMOS transistor II 24 from burning out due to excessive turn-off current. The function of the resistor XVI 22 is twofold: first, to provide current limiting protection; and second, to eliminate the gate oscillation signal of the PMOS transistor II 24.

[0033] In one embodiment of this utility model, a diode I 27 is further included, the positive terminal of which is connected to the drain of PMOS transistor I 23 via fuse I 25, and the negative terminal of which is connected to the power input terminal of the gimbal. Diode I 27 serves to prevent reverse connection and to prevent the PMOS transistor II 24 from being impacted when PMOS transistor I 23 is turned on. When there is overcurrent in the circuit, fuse I 25 blows to prevent damage to subsequent circuits.

[0034] In one embodiment of this utility model, a diode II 28 is further included, the positive terminal of which is connected to the drain of PMOS transistor II 24 via fuse II 26, and the negative terminal of which is connected to the power input terminal of the gimbal. Diode II 28 serves to prevent reverse connection and to prevent the PMOS transistor I 23 from being impacted when PMOS transistor II 24 is turned on. When there is overcurrent in the circuit, fuse II 26 blows to prevent damage to subsequent circuits.

[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circuit for switching power supply mode of a pan-tilt, characterized in that, It comprises: a voltage comparator I (1) whose positive input end is connected to a self-provided power supply line for a head and ground, and whose VCC end is connected to a power supply VCC, and whose ground end is grounded; a voltage comparator II (2) whose positive input end is connected to the positive input end of the voltage comparator I (1), and whose negative input end is connected to the negative input end of the voltage comparator I (1), a storage battery and ground respectively; a triode I (13) whose base is connected to the output end of the voltage comparator I (1), whose emitter is grounded, and whose collector is connected to the self-provided power supply line for the head; a triode II (14) whose base is connected to the output end of the voltage comparator II (2), whose emitter is grounded, and whose collector is connected to the storage battery; a PMOS tube I (23) whose gate is connected to the collector of the triode I (13), whose source is connected to the self-provided power supply line for the head, and whose drain is connected to the power input end of the head; and a PMOS tube II (24) whose gate is connected to the collector of the triode II (14), whose source is connected to the storage battery, and whose drain is connected to the power input end of the head.

2. The circuit for pan-tilt power supply switching according to claim 1, characterized in that: The positive input end of the voltage comparator I (1) is connected to the self-provided power supply line for the head through a resistor I (3) and grounded through a resistor II (4), and the negative input end of the voltage comparator II (2) is connected to the storage battery through a resistor III (5) and grounded through a resistor IV (6).

3. The circuit for powering a PTZ camera according to claim 1, wherein: Both the triode I (13) and the triode II (14) are NPN type triodes.

4. The circuit for powering a PTZ camera according to claim 1, wherein: It further comprises a resistor V (7) and a resistor VI (8), one end of the resistor V (7) is connected to the output end of the voltage comparator I (1), and the other end thereof is connected to the VCC end of the voltage comparator I (1), one end of the resistor VI (8) is connected to the output end of the voltage comparator II (2), and the other end thereof is connected to the VCC end of the voltage comparator II (2).

5. The circuit for powering a PTZ camera according to claim 1, wherein: It further comprises a resistor VII (9), a resistor VIII (10), a resistor IX (11) and a resistor X (12), the base of the triode I (13) is connected to the output end of the voltage comparator I (1) through the resistor VII (9), one end of the resistor IX (11) is connected to the emitter of the triode I (13), and the other end thereof is connected to the base of the triode I (13); the base of the triode II (14) is connected to the output end of the voltage comparator II (2) through the resistor VIII (10), one end of the resistor X (12) is connected to the emitter of the triode II (14), and the other end thereof is connected to the base of the triode II (14).

6. The circuit for powering a PTZ camera according to claim 1, wherein: It further comprises a resistor XI (15) and a resistor XII (16), the collector of the triode I (13) is connected to the self-provided power supply line for the head through the resistor XI (15), and the collector of the triode II (14) is connected to the storage battery through the resistor XII (16).

7. The circuit for powering a PTZ camera according to claim 1, wherein: It further comprises a Schottky diode I (17), a resistor XIII (19) and a resistor XIV (20), the positive pole of the Schottky diode I (17) is connected to the gate of the PMOS tube I (23) through the resistor XIII (19), the negative pole of the Schottky diode I (17) is connected to the collector of the triode I (13), and one end of the resistor XIV (20) is connected to the collector of the triode I (13), and the other end thereof is connected to the gate of the PMOS tube I (23).

8. The circuit for powering a PTZ camera according to claim 1, wherein: It also includes a Schottky diode II (18), a resistor XV (21) and a resistor XVI (22), the positive pole of the Schottky diode II (18) is connected to the gate of the PMOS tube II (24) through the resistor XV (21), the negative pole of the Schottky diode II (18) is connected to the collector of the transistor II (14), one end of the resistor XVI (22) is connected to the collector of the transistor II (14), and the other end of the resistor XVI (22) is connected to the gate of the PMOS tube II (24).

9. The power supply mode switching circuit for a pan-tilt head according to claim 1, characterized in that: It also includes a diode I (27), the positive pole of which is connected to the drain of the PMOS tube I (23) through a fuse I (25), and the negative pole of which is connected to the power input end of the head.

10. The power supply mode switching circuit for a pan-tilt according to claim 1, characterized in that: It also includes a diode II (28), the positive pole of which is connected to the drain of the PMOS tube II (24) through a fuse II (26), and the negative pole of which is connected to the power input end of the head.

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