A slow-start power supply circuit and drone charging device

Abstract

An embodiment of the present invention provides a slow-start power supply circuit and a drone charging device. The slow-start power supply circuit includes: at least one battery charging circuit, the battery charging circuit including a battery trigger circuit, a delayed power supply circuit, and a switch circuit; the first end of the battery trigger circuit is connected to the first end of the delayed power supply circuit, the second end of the battery trigger circuit is used to connect to an external power supply, the third end of the battery trigger circuit is connected to the first end of the switch circuit, the second end of the switch circuit is grounded, and the third end of the switch circuit is connected to the second end of the delayed power supply circuit; the battery trigger circuit is used to insert a battery and turn on the delayed power supply circuit and its input voltage after the battery is inserted, the delayed power supply circuit is used to output a gradually rising voltage, and the switch circuit is used to receive the voltage provided by the delayed power supply circuit and slowly turn on. The present invention solves the problem of voltage spikes caused by battery charging and plugging.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of battery charging, and in particular to a slow-start power supply circuit and a UAV charging device. Background Art

[0002] Currently, most drones are powered by multiple strings of high-rate batteries. When plugging and unplugging such batteries for charging, due to the relatively high voltage, high chemical activity of the batteries, and low internal resistance, if the voltage difference between the charger and the battery is large, a large spike voltage will be generated. The spike voltage will cause certain damage to the battery, and the battery life will be reduced after multiple plugging and unplugging. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a slow-start power supply circuit and a UAV charging device, which can prevent voltage spikes caused by battery charging and plugging, thereby increasing the service life of the battery.

[0004] To solve the above technical problems, an embodiment of the present invention adopts a technical solution: in a first aspect, a slow-start power supply circuit is provided, wherein the slow-start circuit includes at least one battery charging circuit, and the battery charging circuit includes a battery trigger circuit, a delayed power supply circuit, and a switch circuit;

[0005] The first end of the battery trigger circuit is connected to the first end of the delay power supply circuit, the second end of the battery trigger circuit is used to connect to an external power supply, the third end of the battery trigger circuit is connected to the first end of the switch circuit, the second end of the switch circuit is grounded, and the third end of the switch circuit is connected to the second end of the delay power supply circuit;

[0006] The battery trigger circuit is used to insert a battery and connect the first end of the delay power supply circuit and the input voltage of the delay power supply circuit after the battery is inserted. The delay power supply circuit is used to output a gradually rising voltage at the second end when a voltage is input at the first end. The switch circuit is used to receive the voltage provided by the delay power supply circuit and slowly turn on.

[0007] In some embodiments, the battery charging circuit further comprises an ideal diode circuit;

[0008] The first end of the ideal diode circuit is used to connect to the external power supply, the second end of the ideal diode circuit is connected to the second end of the battery trigger circuit, and the ideal diode circuit is used to be turned on when a forward voltage is input and turned off when a reverse voltage is input.

[0009] In some embodiments, the switching circuit includes a switching tube, a first end of the switching tube is connected to the third end of the battery trigger circuit, a second end of the switching tube is grounded, and a third end of the switching tube is connected to the second end of the delayed power supply circuit.

[0010] In some embodiments, the delayed power supply circuit includes a voltage divider circuit, a first resistor and a first capacitor, the first end of the voltage divider circuit is connected to the first end of the battery trigger circuit, the second end of the voltage divider circuit is connected to the first end of the first resistor, the third end of the voltage divider circuit is grounded, the second end of the first resistor is respectively connected to the third end of the switching circuit and the first end of the first capacitor, and the second end of the first capacitor is grounded.

[0011] In some embodiments, the voltage divider circuit includes a second resistor and a third resistor, the first end of the second resistor is connected to the first end of the battery trigger circuit, the second end of the second resistor is respectively connected to the first end of the first resistor and the first end of the third resistor, and the second end of the third resistor is grounded.

[0012] In some embodiments, the delayed power supply circuit further includes a voltage regulator diode, an anode of the voltage regulator diode is grounded, and a cathode of the voltage regulator diode is connected to the third end of the switch circuit.

[0013] In some embodiments, the delayed power supply circuit further includes a leakage diode, wherein the anode of the leakage diode is connected to the first end of the first capacitor, and the cathode of the leakage diode is connected to the first end of the first resistor.

[0014] In some embodiments, the ideal diode circuit includes an ideal diode control circuit and an ideal diode, wherein a first terminal of the ideal diode control circuit is connected to a first terminal of the ideal diode, and a second terminal of the ideal diode control circuit is connected to a third terminal of the ideal diode.

[0015] In some embodiments, the switch tube is an NMOS tube, and the ideal diode is an NMOS tube.

[0016] In a second aspect, a drone charging device is also provided, comprising a battery and a slow-start power supply circuit.

[0017] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the present invention proposes a slow-start power supply circuit, which includes at least one battery charging circuit, and the battery charging circuit includes a battery trigger circuit, a delayed power supply circuit and a switching circuit. When the battery of the drone is inserted into the battery trigger circuit of the battery charging circuit and starts charging, the first end and the second end of the battery trigger circuit are turned on, the first end of the delayed power supply circuit inputs a voltage through an external power supply and outputs a gradually rising voltage at the second end, and the switching circuit receives the voltage provided by the delayed power supply circuit and slowly turns on, thereby realizing the slow start function of the circuit, preventing voltage spikes caused by battery charging and plugging, and thus extending the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings. These exemplified descriptions do not constitute limitations on the embodiments. Elements / modules and steps with the same reference numerals in the drawings are represented as similar elements / modules and steps. Unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

[0019] Figure 1 This is a structural diagram of a slow-start power supply circuit provided by an embodiment of the present invention;

[0020] Figure 2 1 is a schematic structural diagram of a battery charging circuit in a slow-start power supply circuit provided by an embodiment of the present invention;

[0021] Figure 3 1 is a schematic structural diagram of a switch circuit in a slow-start power supply circuit provided by an embodiment of the present invention;

[0022] Figure 4 1 is a schematic diagram of the circuit structure of a delayed power supply circuit in a slow-start power supply circuit provided by an embodiment of the present invention;

[0023] Figure 5 This is a circuit structure diagram of another delayed power supply circuit in the slow-start power supply circuit provided in an embodiment of the present invention;

[0024] Figure 6 1 is a schematic structural diagram of an ideal diode circuit in a slow-start power supply circuit provided by an embodiment of the present invention;

[0025] Figure 7 1 is a schematic diagram of the circuit structure of a battery charging circuit in a slow-start power supply circuit provided by an embodiment of the present invention;

[0026] Figure 8 The figure is a schematic structural diagram of a UAV charging device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present application is described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present application, but are not intended to limit the present invention in any form. It should be noted that, without departing from the concept of the present application, a number of variations and improvements can be made by those skilled in the art. These all fall within the scope of protection of the present application.

[0028] For ease of understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally understood by those skilled in the art in the field of the present application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0029] It should be noted that, unless they conflict, the various features of the embodiments of the present invention may be combined with each other and are all within the scope of protection of this application. Furthermore, although the functional modules are divided in the device schematic, in some cases, the module division may be different from that in the device. Furthermore, the terms "first," "second," and the like used herein do not limit the order of data or execution; they are merely used to distinguish between identical or similar items with substantially the same functions and effects.

[0030] See also Figure 1 , Figure 1 This is a schematic structural block diagram of a slow-start power supply circuit provided by an embodiment of the present invention. The slow-start power supply circuit 1000 includes at least one battery charging circuit 100. The battery charging circuit 100 includes a battery trigger circuit 10, a delayed power supply circuit 11 and a switch circuit 12.

[0031] A first end of the battery trigger circuit 10 is connected to a first end of the delay power supply circuit 11, a second end of the battery trigger circuit 10 is used to connect to an external power supply, a third end of the battery trigger circuit 10 is connected to a first end of the switch circuit 12, a second end of the switch circuit 12 is grounded, and a third end of the switch circuit 12 is connected to a second end of the delay power supply circuit 11;

[0032] Battery trigger circuit 10 is configured to connect a first terminal of delay power supply circuit 11 to the input voltage of delay power supply circuit 11 after battery insertion. Delay power supply circuit 11 is configured to output a gradually increasing voltage at its second terminal when a voltage is input at its first terminal. Switch circuit 12 is configured to receive the voltage provided by delay power supply circuit 11 and slowly turn on. It should be noted that in some embodiments, battery trigger circuit 10 is a three-pin terminal block. Its structure is conventional and will not be further described here. Please refer to the conventional art for details.

[0033] An embodiment of the present invention proposes a slow-start power supply circuit, which includes at least one battery charging circuit. The battery charging circuit includes a battery trigger circuit, a delayed power supply circuit, and a switching circuit. When a drone battery is inserted into the battery trigger circuit of the battery charging circuit and starts charging, a voltage is input to the first end of the delayed power supply circuit and a gradually rising voltage is output at the second end. The switching circuit receives the voltage provided by the delayed power supply circuit and slowly turns on, realizing the slow start function of the circuit, preventing voltage spikes caused by battery charging and plugging, and thus extending the battery life.

[0034] In some of these examples, see Figure 2 The battery charging circuit 100 further includes an ideal diode circuit 13. A first end of the ideal diode circuit 13 is connected to an external power source, and a second end of the ideal diode circuit 13 is connected to the second end of the battery trigger circuit 10. The ideal diode circuit 13 conducts when a forward voltage is input and cuts off when a reverse voltage is input. This prevents multiple batteries from charging in parallel due to different battery voltages. It should be noted that in some embodiments, the battery trigger circuit 10 is a three-pin terminal block. This structure is conventional and will not be described in detail here. Please refer to the prior art for details.

[0035] In some embodiments, see Figure 3 The switch circuit 12 includes a switch tube Q1. The first end of the switch tube Q1 is connected to the third end of the battery trigger circuit 10. The second end of the switch tube Q1 is grounded. The third end of the switch tube Q1 is connected to the second end of the delay power supply circuit. In some embodiments, the switch tube Q1 is an NMOS tube. The first end of the switch tube Q1 corresponds to the drain of the NMOS tube, the second end of the switch tube Q1 corresponds to the source of the NMOS tube, and the third end of the switch tube Q1 corresponds to the gate of the NMOS tube. The switch tube Q1 receives a slowly rising voltage provided by the delay power supply circuit 11 and slowly turns on. It should be noted that in some embodiments, the battery trigger circuit 10 is a terminal block with three pins. Its structure is prior art and will not be described in detail here. Please refer to the prior art.

[0036] In some embodiments, see Figure 4The delayed power supply circuit 11 includes a voltage divider circuit, a first resistor R1 and a first capacitor C1. The first end of the voltage divider circuit is connected to the first end of the battery trigger circuit 10, the second end of the voltage divider circuit 10 is connected to the first end of the first resistor R1, the third end of the voltage divider circuit 10 is grounded, the second end of the first resistor R1 is respectively connected to the third end of the switch circuit 12 and the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded. The first end of the delayed power supply circuit 11 inputs a voltage and outputs a gradually rising voltage at the second end, controlling the switch circuit 12 to slowly turn on. It should be noted that, in some embodiments, the battery trigger circuit 10 is a terminal block with three pins, and its structure is prior art, which will not be described in detail here. Please refer to the prior art.

[0037] In some embodiments, please refer again to Figure 4 The voltage divider circuit includes a second resistor R2 and a third resistor R3. The first end of the second resistor R2 is connected to the first end of the battery trigger circuit 10, and the second end of the second resistor R2 is respectively connected to the first end of the first resistor R1 and the first end of the third resistor R3. The second end of the third resistor R3 is grounded. The voltage divider circuit inputs a voltage at the first end and outputs a voltage at the second end to charge the RC circuit composed of the first resistor R1 and the first capacitor C1. The output voltage is determined by the resistance values ​​of the second resistor and the third resistor. It should be noted that in some embodiments, the battery trigger circuit 10 is a terminal block with three pins. Its structure is prior art and will not be described in detail here. Please refer to the prior art.

[0038] In some embodiments, see Figure 5 The delayed power supply circuit 11 further includes a Zener diode ZD1, the anode of the Zener diode ZD1 is grounded, and the cathode of the Zener diode ZD1 is connected to the third end of the switch circuit 12, for preventing excessive surge voltage from damaging the switch circuit 12.

[0039] In some embodiments, please refer again to Figure 5 The delayed power supply circuit 11 also includes a leakage diode D1, the anode of the leakage diode D1 is connected to the first end of the first capacitor C1, and the cathode of the leakage diode D1 is connected to the first end of the first resistor. When the battery is unplugged, the voltage of the switch circuit 12 can be quickly discharged through the diode, thereby allowing the switch circuit to be quickly turned off.

[0040] In some embodiments, see Figure 6The ideal diode circuit 11 includes an ideal diode control circuit and an ideal diode Q2. The first end of the ideal diode control circuit is connected to an external power source and the first end of the ideal diode Q2, respectively. The second end of the ideal diode control circuit is connected to the third end of the ideal diode Q2. The second end of the ideal diode Q2 is connected to the second end of the battery trigger circuit. In some embodiments, the ideal diode control circuit includes a control chip, the model of which is not limited here, for controlling the operation of the ideal diode Q2. In some embodiments, the ideal diode is an NMOS transistor, the first end of the ideal diode Q2 corresponds to the source of the NMOS transistor, the second end of the ideal diode Q2 corresponds to the drain of the NMOS transistor, and the third end of the ideal diode Q2 corresponds to the gate of the NMOS transistor. The ideal diode circuit 11 conducts when a forward voltage is input and turns off when a reverse voltage is input. This prevents multiple batteries from charging in parallel due to different battery voltages. It should be noted that in some embodiments, the battery trigger circuit 10 is a three-pin terminal block. Its structure is conventional and will not be described in detail here. Please refer to the prior art.

[0041] In some embodiments, see Figure 7 , Figure 7 A circuit diagram of a battery charging circuit is shown. The battery charging circuit includes an ideal diode circuit, a battery trigger circuit, a delayed power supply circuit, and a switch circuit. The ideal diode circuit includes an ideal diode control circuit and an ideal diode. The ideal diode control circuit includes a control chip. The ideal diode is a first NMOS transistor Q1. The battery trigger circuit is a three-pin terminal J1. The delayed power supply circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a Zener diode ZD1, and a bleeder diode D1. The switch circuit includes a switch transistor, which is a second NMOS transistor Q2.

[0042] A first end of the control chip is used to connect to an external power supply and to the source of the first NMOS transistor Q1. A second end of the control chip is connected to the gate of the first NMOS transistor Q1. The drain of the first NMOS transistor Q1 is connected to the second pin of the wiring terminal J1. The first pin of the wiring terminal J1 is connected to the first end of the second resistor R2. The third pin of the wiring terminal J1 is connected to the drain of the second NMOS transistor Q2. The second end of the second resistor R2 is respectively connected to the first end of the third resistor R3, the first end of the first resistor R1, and the cathode of the leakage diode D1. The second end of the third resistor R2 is grounded. The second end of the first resistor R1 is respectively connected to the anode of the leakage diode D2, the first end of the first capacitor C1, the cathode of the Zener diode ZD1, and the gate of the second NMOS transistor Q2. The second end of the first capacitor C1 is grounded, the anode of the Zener diode ZD1 is grounded, and the source of the second NMOS transistor Q1 is grounded.

[0043] When a battery is inserted into terminal J1, pins 1 and 2 of terminal J1 corresponding to the battery are short-circuited. Therefore, when the battery is connected, the voltage from the external power supply is conducted to the first pin of terminal J1 and divided down by the second resistor R2 and the third resistor R3. At this time, due to the RC delay circuit formed by the first resistor R1 and the first capacitor C1, current flows through the delay resistor R1 to charge the delay capacitor C1. At this time, because the gate voltage of the second NMOS transistor Q2 is still low, the second NMOS transistor Q2 is not turned on, and the power supply circuit is not yet established. As the gate voltage of the NMOS transistor gradually rises, the internal resistance of the NMOS transistor gradually decreases, and the current passing through it gradually increases, thus achieving a slow-start function for the entire battery charging circuit. This effectively prevents voltage spikes caused by battery charging and insertion, extending the battery life. When multiple batteries are charged in parallel, that is, when multiple battery charging circuits are present in the slow-start power supply circuit, the ideal diode circuit's characteristic of conducting when a forward voltage is input and blocking when a reverse voltage is input prevents batteries from charging each other due to different voltage levels.

[0044] ZD1 is the gate voltage regulator diode of the second NMOS transistor Q2, which is used to prevent excessive surge voltage from damaging the second NMOS transistor Q2; D1 is a leakage diode. When the battery is unplugged, the gate voltage of the second NMOS transistor can be quickly discharged through this diode, thereby releasing the gate voltage and allowing the second NMOS transistor Q2 to quickly turn off.

[0045] The present invention also provides a UAV charging device 2000, see Figure 8 The drone charging device 2000 includes at least one battery 200 and a slow-start power supply circuit 1000. The slow-start power supply circuit 1000 includes at least one battery charging circuit 100. The battery 200 is inserted into the battery trigger circuit of the battery charging circuit 100 for charging.

[0046] It should be noted that the embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of this embodiment.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slow-start power supply circuit for charging a drone battery, characterized in that: The slow-start power supply circuit includes: at least one battery charging circuit, the battery charging circuit includes a battery trigger circuit, a time-delay power supply circuit and a switch circuit; The first end of the battery trigger circuit is connected to the first end of the delay power supply circuit, the second end of the battery trigger circuit is used to connect to an external power supply, the third end of the battery trigger circuit is connected to the first end of the switch circuit, the second end of the switch circuit is grounded, and the third end of the switch circuit is connected to the second end of the delay power supply circuit; The battery trigger circuit is used to insert a battery and connect the first end of the delay power supply circuit and the input voltage of the delay power supply circuit after the battery is inserted. The delay power supply circuit is used to output a gradually increasing voltage at the second end when a voltage is input to the first end. The switch circuit is used to receive the voltage provided by the delay power supply circuit and slowly turn on. The delayed power supply circuit includes a voltage divider circuit, a first resistor, and a first capacitor, wherein a first end of the voltage divider circuit is connected to a first end of the battery trigger circuit, a second end of the voltage divider circuit is connected to a first end of the first resistor, a third end of the voltage divider circuit is grounded, a second end of the first resistor is respectively connected to a third end of the switch circuit and a first end of the first capacitor, and a second end of the first capacitor is grounded; The battery charging circuit further includes an ideal diode circuit; The first end of the ideal diode circuit is used to connect to the external power supply, the second end of the ideal diode circuit is connected to the second end of the battery trigger circuit, and the ideal diode circuit is used to be turned on when a forward voltage is input and turned off when a reverse voltage is input; The switching circuit includes a switching tube, a first end of the switching tube is connected to the third end of the battery trigger circuit, a second end of the switching tube is grounded, and a third end of the switching tube is connected to the second end of the delay power supply circuit; the delay power supply circuit also includes a voltage regulator diode, an anode of the voltage regulator diode is grounded, and a cathode of the voltage regulator diode is connected to the third end of the switching circuit.

2. The slow-start power supply circuit according to claim 1, characterized in that: The voltage divider circuit includes a second resistor and a third resistor, the first end of the second resistor is connected to the first end of the battery trigger circuit, the second end of the second resistor is respectively connected to the first end of the first resistor and the first end of the third resistor, and the second end of the third resistor is grounded.

3. The slow-start power supply circuit according to claim 2, characterized in that: The delayed power supply circuit further includes a leakage diode, wherein the anode of the leakage diode is connected to the first end of the first capacitor, and the cathode of the leakage diode is connected to the first end of the first resistor.

4. The slow-start power supply circuit according to claim 1, characterized in that: The ideal diode circuit includes an ideal diode control circuit and an ideal diode. The first end of the ideal diode control circuit is used to connect to an external power supply and the first end of the ideal diode respectively. The second end of the ideal diode control circuit is connected to the third end of the ideal diode. The second end of the ideal diode is connected to the second end of the battery trigger circuit.

5. The slow-start power supply circuit according to claim 4, characterized in that: The switch tube is an NMOS tube, and the ideal diode is an NMOS tube.

6. A UAV charging device, characterized in that: The drone charging device comprises a battery and the slow-start power supply circuit according to any one of claims 1 to 5.

Images