Anti-sparking circuit and unmanned aerial vehicle

Abstract

The utility model relates to the technical field of protection circuits, and discloses an anti-sparking circuit and an unmanned aerial vehicle. The anti-sparking circuit comprises two current paths connected between an input power supply and a load, a protection resistor and a first switching circuit are arranged on the first current path, and a second switching circuit is arranged on the second current path. And the first switching circuit and the second switching circuit are respectively used for controlling the on-off of the first current path and the second current path. The first switching circuit and the second switching circuit are synchronously controlled by the same driving circuit, the first switching circuit and the second switching circuit control corresponding current paths to be conducted after receiving a control signal of the driving circuit and delaying for a certain time, and the action delay of the second switching circuit is larger than that of the first switching circuit. The anti-sparking circuit can absorb transient impact energy at the power-on moment, the sparking phenomenon of an interface during power-on is avoided, and the safety of equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of protection circuits, and in particular to an anti-spark circuit and an unmanned aerial vehicle. Background Art

[0002] With the development of drone technology, drone applications are becoming more and more widespread. Due to the needs of portability and customization, more and more drones are beginning to adopt modular design. The electrical connection between components is often inseparable from various forms of interfaces. When the load is powered on, the transient impact energy may generate sparks when passing through the interface, causing the interface to burn. For this reason, a circuit structure needs to be designed to avoid sparking when the load is powered on. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an anti-spark circuit that can absorb the transient impact energy when the load is connected to the power supply, thereby preventing the transient impact energy from causing sparks at the interface and damaging the interface of the equipment.

[0004] To solve the above problems, the technical solution adopted by the utility model is as follows: an anti-spark circuit, comprising two current paths connected between an input power supply and a load, a protection resistor and a first switch circuit are provided on the first current path, and a second switch circuit is provided on the second current path, the first switch circuit and the second switch circuit are respectively used to control the on and off of the first current path and the second current path, the first switch circuit and the second switch circuit are synchronously controlled by the same drive circuit, and the first switch circuit and the second switch circuit both control the corresponding current path to be turned on after a certain delay after receiving the control signal of the drive circuit, and the action delay of the second switch circuit is greater than that of the first switch circuit.

[0005] Compared with the prior art, the beneficial effect of the utility model is that two current paths are set between the input power supply and the load, wherein the first current path is provided with a protective resistor, and the first current path and the second current path are provided with a first switch circuit and a second switch circuit respectively, which are used to control the on and off of the first current path and the second circuit path respectively. When power is turned on, the first current path is turned on first, so that the transient impact energy when power is turned on is first absorbed by the protective resistor on the first current path, and then the second current path is turned on. Since the on-resistance of the first current path is much larger than that of the second current path, after the second current path is turned on, the first current path is equivalent to an open circuit, and the input power flows losslessly to the load from the second current path. The anti-spark circuit can prevent the transient impact energy when the load is powered on from causing sparks at the interface and damaging the equipment.

[0006] The above-mentioned anti-spark circuit, the driving circuit includes an operational amplifier, a control switch, a voltage stabilizing circuit, a positive end voltage divider circuit and a negative end voltage divider circuit, the non-inverting input terminal of the operational amplifier is connected to the input power supply through the control switch and the protection resistor, the inverting input terminal of the operational amplifier is connected to the input power supply through the negative end voltage divider circuit, the input terminal of the voltage stabilizing circuit is connected to the input power supply through a first resistor, the output terminal of the voltage stabilizing circuit is connected to the power supply terminal of the operational amplifier, and the output terminal of the operational amplifier is respectively connected to the control terminals of the first switch circuit and the second switch circuit.

[0007] The above-mentioned anti-spark circuit, the voltage stabilizing circuit includes a voltage stabilizing chip and its peripheral circuits.

[0008] In the above-mentioned anti-spark circuit, the first switch circuit includes a first switch tube, a second switch tube and a first RC delay circuit, the source and drain of the first switch tube are connected in series between the protection resistor and the load, the first RC delay circuit is connected in parallel between the source and the gate of the first switch tube, the base of the second switch tube is connected to the drive circuit, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the gate of the first switch tube.

[0009] In the above-mentioned anti-spark circuit, a voltage-stabilizing diode is connected in parallel between the source and the gate of the first switch tube, and the drain of the first switch tube is connected to the load through a diode.

[0010] In the above-mentioned anti-spark circuit, the first RC delay circuit is grounded through the first leakage circuit.

[0011] In the above-mentioned anti-spark circuit, the second switch circuit includes a third switch tube, a fourth switch tube and a second RC delay circuit, the source and drain of the third switch tube are connected in series between the input power supply and the load, the second RC delay circuit is connected in parallel between the source and the gate of the third switch tube, the base of the fourth switch tube is connected to the drive circuit, the emitter of the fourth switch tube is grounded, and the collector of the fourth switch tube is connected to the gate of the third switch tube.

[0012] In the above-mentioned anti-spark circuit, a voltage stabilizing diode is connected in parallel between the source and the gate of the third switch tube.

[0013] In the above-mentioned anti-spark circuit, the second RC delay circuit is grounded through the second leakage circuit.

[0014] A drone comprises the above-mentioned anti-spark circuit.

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a principle block diagram of the anti-spark circuit of the embodiment of the utility model;

[0017] Figure 2 A circuit schematic diagram of two current paths of an embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of a voltage stabilizing circuit according to an embodiment of the utility model;

[0019] Figure 4 The schematic diagram of the driving circuit of the embodiment of the utility model is shown in FIG. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below. Figure 1 The embodiment of the utility model provides an anti-spark circuit, including two current paths connected in parallel between an input power supply and a load, a protection resistor and a first switch circuit are provided on the first current path, and a second switch circuit is provided on the second current path. The first switch circuit and the second switch circuit are used to control the on and off of the first current path and the second current path respectively. The first switch circuit and the second switch circuit are synchronously controlled by the same drive circuit. After receiving the control signal of the drive circuit, the first switch circuit and the second switch circuit both control the corresponding current path to be turned on after a certain delay, and the action delay of the second switch circuit is greater than that of the first switch circuit.

[0021] In the anti-spark circuit of the embodiment of the utility model, when powered on, the driving circuit sends a control signal to the first switch circuit and the second switch circuit at the same time, and the first switch circuit and the second switch circuit start working at the same time. After a certain delay, the first switch circuit first controls the first current path to be turned on. At this time, the input power flows to the load through the first current path, and the transient impact energy when the power is connected is absorbed by the protection resistor, thereby preventing the transient impact energy from causing sparks to appear at the interface, thereby causing damage to the equipment. After a certain period of time, the second switch circuit controls the second current path to be turned on. Since the on-resistance of the second current path is much smaller than that of the first current path, the first current path can be regarded as an open circuit at this time, and the input power is delivered to the load losslessly through the second current path.

[0022] Reference Figure 2In this embodiment, the first switch circuit includes a first switch tube Q1, a second switch tube Q5 and a first RC delay circuit. The source and drain of the first switch tube Q1 are connected in series between the protection resistor R2 and the load, and the load is connected through a jumper connector J95. The gate of the first switch tube Q1 is connected to the collector of the second switch tube Q5 through a resistor R28, the emitter of the first switch tube Q1 is grounded, and the base of the second switch tube Q5 is connected to the output end of the drive circuit through a resistor R7. The first RC delay circuit includes a capacitor C24 and a resistor R6, which are connected in parallel between the source and the gate of the first switch tube Q1. The delay time is adjusted by setting the parameters of the capacitor C24. When powered on, the drive circuit outputs a control signal to the second switch tube Q5 to turn on the second switch tube Q5. After the delay time set by the first RC delay circuit, the first switch tube Q1 is turned on, and the input power flows to the load through the protection resistor R2 and the first switch tube Q1.

[0023] Reference Figure 2 The second switch circuit has a similar structure to the first switch circuit, and includes a third switch tube Q3, a fourth switch tube Q6, and a second RC delay circuit. The source and drain of the third switch tube Q3 are connected in series between the input power supply and the load, the gate of the third switch tube Q3 is connected to the collector of the fourth switch tube Q6 through a resistor R23, the emitter of the fourth switch tube Q6 is grounded, and the base of the fourth switch tube Q6 is connected to the output end of the drive circuit. The second RC delay circuit includes a capacitor C23 and a resistor R12, the capacitor C23 and the resistor R12 are connected in parallel between the source and the gate of the third switch tube Q3, and the delay time is adjusted by setting the parameters of the capacitor C23, so that the delay time of the second RC delay circuit is longer than the delay time of the first RC delay circuit, so that after power-on, the second current path is controlled by the second switch circuit and is turned on later than the first current path, so as to avoid the transient impact energy during power-on being directly output to the load, resulting in sparks at the interface.

[0024] Reference Figure 2In order to prevent the first switch tube Q1 and the third switch tube Q3 from being damaged due to high voltage, voltage stabilizing diodes D86 and D104 are respectively arranged between the source and gate of the first switch tube Q1 and the third switch tube Q3 to clamp the voltage between the source and gate of the first switch tube Q1 and the third switch tube Q3. It can be understood that the first switch circuit and the second switch circuit can also use other controllable switch devices such as time relays. Since the first RC delay circuit and the second RC delay circuit include a capacitor as an energy storage device, when the device is powered off, a leakage circuit needs to be set for the capacitors C24 and C23 in the first RC delay circuit and the second RC delay circuit. The first leakage circuit of the first RC delay circuit includes a switch tube Q2, a resistor R8, a resistor R3 and a resistor R5. The collector of the switch tube Q2 is connected to one end of the capacitor C24 connected to the source of the first switch tube Q1, the emitter of the switch tube Q2 is connected to the other end of the capacitor C24 through the resistor R8, a resistor R3 is provided between the base and the collector of the switch tube Q2, and the base of the switch tube Q2 is grounded through the resistor R5. When the device is powered off, by setting the resistance values ​​of the resistors R3, R5 and R8, the switch tube Q2 can remain turned on when powered off, and the current in the capacitor C24 is quickly discharged through the two leakage paths formed by the resistors R8, R3 and R5. The second leakage circuit corresponding to the second RC delay circuit includes the switch tube Q4, the resistor R11, the resistor R9 and the resistor R10, and its connection method and principle are similar to those of the first leakage circuit, which will not be repeated here.

[0025] Reference Figure 2 In this embodiment, the drain of the first switch tube Q1 is connected to the load through the diode D3, and the drain of the third switch tube Q3 is connected to the load through the resistor R38. It can be understood that the resistance of the resistor R38 is much smaller than the resistance of the protection resistor R2.

[0026] Reference Figure 4 In this embodiment, the driving circuit includes an operational amplifier U7, a control switch K2, a voltage stabilizing circuit, a positive voltage divider circuit and a negative voltage divider circuit. The positive voltage divider circuit includes a resistor R33 and a resistor R34, and the negative voltage divider circuit includes resistors R31 and R32. The in-phase input terminal of the operational amplifier U7 is connected to the control switch K2 through a resistor R33, and is connected to the input power supply through the control switch K2, and the in-phase input terminal of the operational amplifier U7 is grounded through a resistor R34. The inverting input terminal of the operational amplifier U7 is connected to the input power supply through a resistor R31 and is grounded through a resistor R32. By setting the resistance values ​​of the resistors R31, R32, R33 and R34, when powered on, the input voltage of the in-phase input terminal of the operational amplifier U7 is higher than its inverting input terminal, so that the output terminal of the operational amplifier U7 outputs a high level. The output terminal of the operational amplifier U7 is connected to the base of the second switch tube Q5 and the fourth switch tube Q6.

[0027] The voltage stabilizing circuit is used to power the operational amplifier U7, including the voltage stabilizing chip U6 and its peripheral circuits. In this embodiment, the voltage stabilizing chip U6 adopts the voltage stabilizing chip model TL432AIDBZR, outputs a 4.5V working voltage to the VCC pin of the operational amplifier U7, and the output end of the voltage stabilizing chip U6 is also connected to the output end of the operational amplifier U7 through the resistor R26. Figure 2 In this embodiment, the control switch K2 is a button switch, the input end is connected to the input power supply, and the output end is respectively connected to the first current path, the second current path and the input end of the driving circuit. When the control switch K2 is turned on, the voltage of the in-phase input end of the operational amplifier U7 is higher than its inverting input end, so that the operational amplifier U7 outputs a high level of 4.5V to the base of the second switch tube Q5 and the fourth switch tube Q6, so that the second switch tube Q5 and the fourth switch tube Q6 are turned on, and the input power charges the capacitor C24 and the capacitor C23 at the same time, and then the first switch tube Q1 and the third switch tube Q3 are turned on successively, so that the input power first flows to the load through the first current path, and the protection resistor R2 absorbs the transient impact, and then the input power flows to the load through the second current path, so as to avoid sparking when the load is powered on.

[0028] The drone of the embodiment of the utility model includes the above-mentioned anti-spark circuit. The power supply and some loads are connected through the above-mentioned anti-spark circuit, which can prevent sparks from appearing on the interface when power is turned on, prevent damage to the drone, and extend the service life of the drone.

[0029] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A spark prevention circuit, characterized in that: The invention comprises two current paths connected between an input power supply and a load, wherein a protective resistor and a first switch circuit are arranged on the first current path, and a second switch circuit is arranged on the second current path, wherein the first switch circuit and the second switch circuit are respectively used to control the on and off of the first current path and the second current path, wherein the first switch circuit and the second switch circuit are synchronously controlled by the same drive circuit, and wherein the first switch circuit and the second switch circuit both control the corresponding current path to be turned on after a certain delay after receiving the control signal of the drive circuit, and the action delay of the second switch circuit is greater than that of the first switch circuit.

2. The anti-spark circuit according to claim 1, characterized in that: The driving circuit includes an operational amplifier, a control switch, a voltage stabilizing circuit, a positive voltage divider circuit and a negative voltage divider circuit. The non-inverting input terminal of the operational amplifier is connected to the input power supply through the control switch and the protection resistor, the inverting input terminal of the operational amplifier is connected to the input power supply through the negative voltage divider circuit, the input terminal of the voltage stabilizing circuit is connected to the input power supply through a first resistor, the output terminal of the voltage stabilizing circuit is connected to the power supply terminal of the operational amplifier, and the output terminal of the operational amplifier is respectively connected to the control terminals of the first switch circuit and the second switch circuit.

3. The anti-spark circuit according to claim 2, characterized in that: The voltage stabilizing circuit comprises a voltage stabilizing chip and its peripheral circuits.

4. The anti-spark circuit according to claim 1, characterized in that: The first switch circuit includes a first switch tube, a second switch tube and a first RC delay circuit, the source and drain of the first switch tube are connected in series between the protection resistor and the load, the first RC delay circuit is connected in parallel between the source and the gate of the first switch tube, the base of the second switch tube is connected to the drive circuit, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the gate of the first switch tube.

5. The anti-spark circuit according to claim 4, characterized in that: A voltage stabilizing diode is connected in parallel between the source and the gate of the first switch tube, and the drain of the first switch tube is connected to the load through a diode.

6. The anti-spark circuit according to claim 4, characterized in that: The first RC delay circuit is grounded through the first leakage circuit.

7. The anti-spark circuit according to claim 1, characterized in that: The second switch circuit includes a third switch tube, a fourth switch tube and a second RC delay circuit, the source and drain of the third switch tube are connected in series between the input power supply and the load, the second RC delay circuit is connected in parallel between the source and the gate of the third switch tube, the base of the fourth switch tube is connected to the drive circuit, the emitter of the fourth switch tube is grounded, and the collector of the fourth switch tube is connected to the gate of the third switch tube.

8. The anti-spark circuit according to claim 7, characterized in that: A voltage stabilizing diode is connected in parallel between the source and the gate of the third switch tube.

9. The anti-spark circuit according to claim 7, characterized in that: The second RC delay circuit is grounded through a second leakage circuit.

10. A drone, characterized in that: The invention comprises an anti-spark circuit according to any one of claims 1 to 9.

Images