CN217882879U

CN217882879U - Power supply circuit and consumer

Info

Publication number: CN217882879U
Application number: CN202221043914.2U
Authority: CN
Inventors: 秦威
Original assignee: Shenzhen Autel Intelligent Aviation Technology Co Ltd
Current assignee: Shenzhen Autel Intelligent Aviation Technology Co Ltd
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-11-22
Anticipated expiration: 2032-04-28

Abstract

The embodiment of the application provides a power supply circuit and electric equipment, which comprise an NMOS (N-channel metal oxide semiconductor) tube, a charging unit and a discharging unit; the source electrode of the NMOS tube, the first end of the charging unit and the first end of the discharging unit are connected with a first connecting end, the drain electrode of the NMOS tube is used for connecting the first end of the load, the grid electrode of the NMOS tube is respectively connected with the second end of the charging unit and the second end of the discharging unit, the third end of the charging unit is connected with a second connecting end, the first connecting end is used for connecting the first end of the battery pack, and the second connecting end is used for connecting the second end of the battery pack and the second end of the load; through the mode, peak voltage and current can be prevented from being generated at the moment of plugging the battery pack, so that the device is protected.

Description

Power supply circuit and consumer

Technical Field

The embodiment of the application relates to the technical field of electronics, in particular to a power supply circuit and electric equipment.

Background

At present, in electric equipment using pluggable battery packs, high-rate battery packs are mostly adopted for power supply, and the battery packs have high voltage and high chemical activity. When the battery pack is inserted into the electric equipment, large peak voltage and current are generated, and components of the electric equipment are easily burnt out if the battery pack is not protected.

Disclosure of Invention

The embodiment of the application provides a power supply circuit and electric equipment, which can avoid generating peak voltage and current when a battery pack is inserted, so that a device is protected.

One technical scheme adopted by the embodiment of the application is as follows: there is provided a power supply circuit including: the charge unit comprises an NMOS tube, a charge unit and a discharge unit; the source electrode of the NMOS tube, the first end of the charging unit and the first end of the discharging unit are all connected with a first connecting end, the drain electrode of the NMOS tube is used for connecting the first end of a load, the grid electrode of the NMOS tube is respectively connected with the second end of the charging unit and the second end of the discharging unit, the third end of the charging unit is connected with a second connecting end, the first connecting end is used for connecting the first end of a battery pack, and the second connecting end is used for connecting the second end of the battery pack and the second end of the load; the charging unit is used for outputting a first signal to the NMOS tube through a second end of the charging unit, charging when the battery pack is connected between the first connecting end and the second connecting end so as to increase the voltage of the first signal, and discharging through the discharging unit when the battery pack is not connected between the first connecting end and the second connecting end so as to reduce the voltage of the first signal; the NMOS tube is used for connecting or disconnecting the first connection end and the load according to the first signal.

In some embodiments, the charging unit comprises a first resistor and a first capacitor; the first end of the first resistor is connected with the second connecting end, the second end of the first resistor is respectively connected with the grid electrode of the NMOS tube, the first end of the first capacitor and the second end of the discharge unit, and the second end of the first capacitor is connected with the first connecting end.

In some embodiments, the discharge unit comprises a triode; the first end of the triode is connected with the second end of the charging unit, the second end of the triode is respectively connected with the first connecting end, the second connecting end and the third end of the charging unit, and the third end of the triode is respectively connected with the first connecting end and the first end of the charging unit.

In some embodiments, the discharge unit further includes a first diode; and the cathode of the first diode is respectively connected with the second connecting end and the third end of the charging unit, and the anode of the first diode is connected with the second end of the triode.

In some embodiments, the discharge cell further comprises a second resistor; the second resistor is connected between the anode of the first diode and the second end of the triode.

In some embodiments, the discharge unit further includes a third resistor; the third resistor is connected between the third end of the triode and the first connecting end.

In some embodiments, the power supply circuit further comprises a fourth resistor; the fourth resistor is connected between the first connecting end and the second connecting end.

In some embodiments, the power supply circuit further comprises a fifth resistor; the first end of the fifth resistor is connected with the first connection end, and the second end of the fifth resistor is respectively connected with the first end of the fourth resistor, the third end of the charging unit and the third end of the discharging unit.

In some embodiments, the power supply circuit further comprises a second diode; the cathode of the second diode is connected with the grid electrode of the NMOS tube, and the anode of the second diode is connected with the source electrode of the NMOS tube.

In a second aspect, an embodiment of the present application further provides an electrical device, where the electrical device includes the power supply circuit according to any one of the first aspect.

Compared with the prior art, the beneficial effects of this application are: different from the situation in the prior art, the embodiment of the application provides a power supply circuit and electric equipment, which include an NMOS transistor, a charging unit and a discharging unit; the source electrode of the NMOS tube, the first end of the charging unit and the first end of the discharging unit are connected with a first connecting end, the drain electrode of the NMOS tube is used for connecting the first end of the load, the grid electrode of the NMOS tube is respectively connected with the second end of the charging unit and the second end of the discharging unit, the third end of the charging unit is connected with a second connecting end, the first connecting end is used for connecting the first end of the battery pack, and the second connecting end is used for connecting the second end of the battery pack and the second end of the load; in the power supply circuit, when the battery pack is inserted between the first connecting end and the second connecting end, the charging unit charges, the voltage of a first signal output to the NMOS tube is improved, when the voltage of the first signal is greater than or equal to the conduction voltage of the NMOS tube, the NMOS tube is conducted, when the first connecting end and the second connecting end are powered off, the charging unit discharges, the voltage of the first signal is reduced, when the voltage of the first signal is less than the conduction voltage of the NMOS tube, the NMOS tube is turned off, and therefore, the power supply circuit can avoid generation of peak voltage and current in the instant of insertion, and devices are protected.

Drawings

One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.

Fig. 1 is a block diagram of a power supply circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit structure diagram of a power supply circuit according to an embodiment of the present disclosure.

Detailed Description

The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the present application in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.

To facilitate an understanding of the present application, the present application is described in more detail below with reference to the figures and the detailed description. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, if not conflicting, the individual features of the embodiments of the present application may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

At present, but the power supply of plug-in group battery is adopted to consumer and trade unmanned aerial vehicle mostly, because group battery voltage is usually than higher, and the chemical activity of group battery is great, can produce some very big peak voltage and electric current in the twinkling of an eye when the group battery is pegged graft, if do not protect the components and parts of burning out unmanned aerial vehicle very easily.

Usually, can set up the filter capacitance of great appearance value to absorb the grafting and produce spike voltage and electric current in the twinkling of an eye, however this kind of filter capacitance is generally bulky, along with unmanned aerial vehicle's miniaturized development, adopts above-mentioned mode can produce contradicting with unmanned aerial vehicle is miniaturized.

The embodiment of the application provides a supply circuit and consumer need not to adopt the great filter capacitor of volume to absorb the spike voltage of pegging graft production in the twinkling of an eye, is adapted to miniaturized unmanned aerial vehicle.

In a first aspect, an embodiment of the present application provides a power supply circuit, please refer to fig. 1, where the power supply circuit includes: a first switch 10, a charging unit 20, and a discharging unit 30.

The first end of the first switch 10, the first end of the charging unit 20 and the first end of the discharging unit 30 are all connected to a first connection terminal POWER-, the second end of the first switch 10 is used for connecting the first end of the load 200, the third end of the first switch 10 is respectively connected to the second end of the charging unit 20 and the second end of the discharging unit 30, the third end of the charging unit 20 is connected to a second connection terminal POWER +, the first connection terminal POWER-is used for connecting the first end of the battery pack, and the second connection terminal POWER + is used for connecting the second end of the battery pack and the second end of the load 200.

The charging unit 20 is configured to output a first signal to the first switch 10 through the second end of the charging unit 20, charge the battery pack when the battery pack is connected between the first connection end POWER-and the second connection end POWER +, so as to increase a voltage of the first signal, and discharge the battery pack through the discharging unit 30 when the battery pack is not connected between the first connection end POWER-and the second connection end POWER +, so as to decrease the voltage of the first signal. The first switch 10 is used for turning on or off the connection between the first connection terminal POWER-and the load 200 according to the first signal.

The first end of the battery pack is connected with the first connection end POWER in a pluggable mode, and the second end of the battery pack is connected with the second connection end POWER in a pluggable mode. The battery pack may comprise one battery, and may also comprise at least two batteries connected in series and/or in parallel; the battery comprises one battery cell and also can comprise at least two battery cells which are connected in series and/or in parallel; the battery cell can be a high-rate battery cell, and the high-rate battery cell is a battery cell with a discharge rate exceeding 1C.

In the application, the first end of the battery pack is taken as a positive electrode, the second end of the battery pack is taken as a negative electrode, and then, when the battery pack is inserted between the first connection end POWER-and the second connection end POWER +, the first connection end POWER-is the negative electrode end of the battery pack, and the second connection end POWER + is the positive electrode end of the battery pack. In addition, in one embodiment, referring to fig. 2, the first connection terminal POWER-is also connected to the ground GND.

The load 200 is a power utilization system of the power utilization equipment, and for the power utilization equipment with a large filter capacitance, referring to fig. 2, the load 200 may be equivalent to a circuit in which a load resistor RLoad and a load capacitor CLoad are connected in parallel. It should be noted that, in fig. 2, the second terminal of the load 200 is grounded PGND, the ground PGND is not equal to the ground GND, and the ground PGND and the ground GND may not be connected or may be connected through the isolation module.

In the POWER supply circuit, when the first end of the battery pack is connected to the first connection terminal POWER-, and the second end of the battery pack is connected to the second connection terminal POWER +, that is, the battery pack is plugged between the first connection terminal POWER-and the second connection terminal POWER +, the charging unit 20 charges and increases the voltage of the first signal output to the first switch 10; when the voltage of the first signal is greater than or equal to the turn-on voltage of the first switch 10, the first switch 10 is turned on, so that the connection between the first terminal of the load 200 and the second connection terminal POWER + is turned on, and the load 200 can be powered by the battery pack. Through the mode, the large voltage at the moment of battery pack plugging can be buffered by the charging unit 20 and then output to the first switch 10, so that the damage to devices caused by peak voltage and peak current generated at the moment of battery pack plugging can be avoided.

When the first end of the battery pack is not connected with the first connection terminal POWER-, and the second end of the battery pack is not connected with the second connection terminal POWER +, that is, when the POWER supply circuit is powered down, the charging unit 20 discharges through the discharging unit 30, so that the voltage of the first signal output to the first switch 10 is reduced; when the voltage of the first signal is less than the turn-on voltage of the first switch 10, the first switch 10 is turned off, so that the connection between the first terminal of the load 200 and the second connection terminal POWER + is disconnected. It can be seen that, when this power supply circuit falls down, charging unit 20 accessible discharge unit 30 releases voltage to the voltage that reduces first signal is even 0, like this, can let power supply circuit when the group battery is pegged graft next time, can charge charging unit 20 once more, thereby normal work improves power supply circuit's reliability, can also prevent in addition that the plug process from relapseing in succession, causes first switch 10's oscillation phenomenon, avoids haring the device in the circuit.

It can be seen that, in the power supply circuit, by arranging the charging unit 20, the first switch 10 can be slowly started at the instant of plugging the battery pack, so as to avoid generating peak voltage and peak current on the first switch 10, thereby protecting the circuit; and, through setting up the discharge unit 30, can provide the bleeder circuit for the energy that charging unit 20 stored when the power supply circuit loses electricity, make first signal voltage reduce to improve the turn-off speed of first switch 10, the circuit normally works when the follow-up group battery of throw pillow is pegged graft again. In summary, the power supply circuit can enable the first switch 10 to be slowly started and the first switch 10 to be quickly turned off by arranging the charging unit 20 and the discharging unit 30, and does not need to adopt a filter capacitor with a large volume to absorb a peak voltage generated at the moment of plugging, so that the power supply circuit is suitable for miniaturized electric equipment.

In some embodiments, referring to fig. 2, the first switch 10 includes an NMOS transistor Q1. The source of the NMOS transistor Q1 is connected to the first connection terminal POWER-, the first terminal of the discharge unit 30, and the first terminal of the charge unit 20, the drain of the NMOS transistor Q1 is connected to the first terminal of the load 200, and the gate of the NMOS transistor Q1 is connected to the second terminal of the charge unit 20 and the second terminal of the discharge unit 30.

Specifically, when the battery pack is plugged in the power supply circuit, the source of the NMOS transistor Q1 is connected to the negative electrode of the battery pack, and the drain of the NMOS transistor Q1 is connected to the negative electrode of the load 200, that is, the first switch 10 is disposed between the negative electrode of the load 200 and the negative electrode of the battery pack, so that the power supply circuit is a negative electrode control power supply circuit, and compared with an anode control power supply circuit in which the PMOS transistor is used as the first switch 10 and the PMOS transistor is disposed between the positive electrode of the load 200 and the positive electrode of the battery pack, the embodiment of the present application has the following advantages by adopting the negative electrode control power supply circuit mode: firstly, under the same performance, the manufacturing cost of the NMOS tube Q1 is lower than that of the PMOS tube, and the cost of the power supply circuit can be reduced by using the NMOS tube Q1; in addition, the internal resistance of the NMOS tube Q1 is lower than that of the PMOS tube, so that the loss generated by the power supply circuit can be reduced under the condition of large current, and the utilization rate of the battery pack is improved.

In some embodiments, referring to fig. 2, the charging unit 20 includes a first resistor R1 and a first capacitor C1. The first end of the first resistor R1 is connected to the second connection terminal POWER +, the second end of the first resistor R1 is connected to the third end of the first switch 10, the first end of the first capacitor C1 and the second end of the discharge unit 30, respectively, and the second end of the first capacitor C1 is connected to the first connection terminal POWER-.

Specifically, the first end of the first resistor R1 is further connected to the third end of the discharge unit 30, and the second end of the first resistor R1 is respectively connected to the gate of the NMOS transistor Q1, the first end of the first capacitor C1, and the first end of the discharge unit 30. In the power supply circuit, a first signal is output to the gate of the NMOS transistor Q1 through the first end of the first capacitor C1. Because the voltage at the two ends of the first capacitor C1 cannot suddenly change, when the anode of the battery pack is connected with the first connection end POWER-and the cathode of the battery pack is connected with the second connection end POWER +, the battery pack charges the first capacitor C1 through the first resistor R1, and then the voltage of the first end of the first capacitor C1 is increased, namely the voltage of the first signal is also increased; when the voltage of the first end of the first capacitor C1 is greater than or equal to the turn-on voltage of the NMOS transistor Q1, that is, the first signal voltage is greater than or equal to the turn-on voltage of the NMOS transistor Q1, the NMOS transistor Q1 is turned on.

Then, when the positive electrode of the battery pack is disconnected from the first connection terminal POWER-and the negative electrode of the battery pack is disconnected from the second connection terminal POWER +, the voltage at the first end of the first capacitor C1 is discharged through the discharging unit 30, and the voltage at the first end of the first capacitor C1 is reduced, that is, the voltage of the first signal is reduced; when the voltage of the first end of the first capacitor C1 is reduced to be less than the turn-on voltage of the NMOS transistor Q1, that is, the first signal voltage is less than the turn-on voltage of the NMOS transistor Q1, the NMOS transistor Q1 is turned off.

It can be seen that, in this power supply circuit, through setting up first resistance R1 and first electric capacity C1, in the battery pack grafting moment, can avoid producing spike voltage and spike current to protect first switch 10, improve the security of circuit, and after falling the power supply, can carry out bleed voltage through discharge unit 30, make first switch 10 break off, guarantee that the circuit normally works.

In addition, in the POWER supply circuit, the first resistor R1 and the first capacitor C1 form a delay module, so that the first time t required for turning on the first switch 10 after the battery pack is plugged between the first connection terminal POWER + and the second connection terminal POWER-can be determined by selecting the type of the first resistor R1 and the first capacitor C1. Wherein the first time t can be calculated by the following formula:

t＝-R*C*li((E-V)/E)；

wherein "-" is a minus sign; "ln" is the natural logarithm; r is the resistance value of the first resistor R1 and the unit is ohm; c is the capacitance value of the first capacitor C1 and the unit is farad; e is the voltage between the first resistor R1 and the first capacitor C1, which is usually 0v before the battery pack is plugged, and v is the voltage to be reached at the first terminal of the first capacitor C1, i.e. the turn-on voltage of the NMOS transistor Q1. Through the formula, after the first resistor R1 and the first capacitor C1 are subjected to type selection, the first time required for the first switch 10 to be conducted after the battery pack is inserted between the first connection end POWER + and the second connection end POWER-is determined.

In some embodiments, referring to fig. 2, the discharge unit 30 includes a transistor Q2. The first end of the triode Q2 is connected with the second end of the charging unit 20, the second end of the triode Q2 is respectively connected with the first connection terminal POWER-, the second connection terminal POWER + and the third end of the charging unit 20, and the third end of the triode Q2 is respectively connected with the first connection terminal POWER-and the first end of the charging unit 20.

Specifically, the triode Q2 is a PNP triode Q2, an emitter of the PNP triode Q2 is connected to the first end of the first capacitor C1 and the gate of the NMOS transistor Q1, a base of the PNP triode Q2 is connected to the first connection terminal POWER-, the second connection terminal POWER + and the first end of the first resistor R1, and a collector of the PNP triode Q2 is connected to the first connection terminal POWER-and the second end of the first capacitor C1.

In the POWER supply circuit, when the battery pack is pulled out from the first connection end POWER-and the second connection end POWER +, namely when the POWER supply circuit is powered off, the voltage at the first end of the first capacitor C1 is discharged through the emitting electrode of the PNP triode Q2, the base electrode of the PNP triode Q2 and the first connection end POWER-; at this moment, the PNP triode Q2 is turned on, the first end voltage of the first capacitor C1 is discharged through the PNP triode Q2, on one hand, the first end voltage of the first capacitor C1 is discharged through the emitter of the PNP triode Q2, the base of the PNP triode Q2, and the first connection terminal POWER-, and on the other hand, the first end voltage of the first capacitor C1 is discharged through the emitter of the PNP triode Q2, the collector of the PNP triode Q2, and the first connection terminal POWER-, so that the gate voltage of the NMOS transistor Q1 is rapidly reduced, and the turn-off speed of the NMOS transistor Q1 is increased.

It can be seen that, in this discharge unit 30, through setting up the PNP triode, can provide the return circuit of bleeding for first electric capacity C1, thereby can be when power supply circuit falls, bleed first electric capacity C1's first end voltage, bleed NMOS pipe Q1's grid voltage promptly, thereby can accelerate NMOS pipe Q1's turn-off speed, avoid NMOS pipe Q1 to take place to vibrate when plug the group battery repeatedly, protection NMOS pipe Q1, improve supply circuit's reliability. Because the switching loss of the power tube is related to the speed of the power tube for switching on and switching off, the power supply circuit can reduce the switching loss of the NMOS tube Q1 and improve the reliability of the circuit.

In some embodiments, with continued reference to fig. 2, the discharge unit 30 further includes a first diode D1. The cathode of the first diode D1 is connected to the second connection terminal POWER + and the third terminal of the charging unit 20, respectively, and the anode of the first diode D1 is connected to the second terminal of the triode Q2. Specifically, the cathode of the first diode D1 is connected to the second connection terminal POWER + and the first end of the first resistor R1, respectively, and the anode of the first diode D1 is connected to the base of the PNP triode Q2.

In this POWER supply circuit, through setting up first diode D1, can realize the electrical isolation between second link POWER + and PNP triode Q2, can avoid when the second link POWER + is connected to the group battery, the high-voltage pulse signal of second link POWER + passes to PNP triode Q2 to protection PNP triode Q2 improves POWER supply circuit's security and reliability.

In one specific embodiment, the first diode D1 is a schottky diode, and since the schottky diode has a fast response characteristic, when the power supply circuit of the discharge unit is powered off, the voltage bleeding speed of the first end of the first capacitor C1, that is, the voltage bleeding speed of the first signal, that is, the gate voltage bleeding speed of the NMOS transistor Q1, can be increased, so that the turn-off speed of the first switch 10 can be increased. In this power supply circuit, through setting up schottky diode, can accelerate NMOS pipe Q1's grid voltage speed of bleeding, when guaranteeing that the group battery is pegged graft next time, power supply circuit can be in normal work to can prevent that power supply circuit from producing undulantly at the group battery plug in-process repeatedly, avoid the circuit to vibrate, improve the reliability of circuit work.

In some embodiments, referring to fig. 2, the discharge unit 30 further includes a second resistor R2. The second resistor R2 is connected between the anode of the first diode D1 and the second terminal of the transistor Q2. Specifically, the second resistor R2 is connected between the anode of the first diode D1 and the base of the PNP triode Q2. Through setting up second resistance R2, can restrict first electric capacity C1 discharge in-process, from the magnitude of the electric current that PNP triode base flowed to device among the protection power supply circuit improves power supply circuit's operational reliability. In practical applications, the second resistor R2 may also be connected between the second connection terminal POWER + and the cathode of the first diode D1, and the number and the resistance of the second resistor R2 may be set according to actual needs, which is not limited herein.

In some embodiments, with continued reference to fig. 2, the discharge unit 30 further includes a third resistor R3. The third resistor R3 is connected between the third end of the triode Q2 and the first connection terminal POWER-. Specifically, a first end of the third resistor R3 is connected to the collector of the PNP triode Q2, and a second end of the third resistor R3 is connected to the first connection terminal POWER-. Through setting up third resistance R3, can restrict first electric capacity C1 discharge in-process, follow the magnitude of the electric current that PNP triode collecting electrode flowed to device among the protection power supply circuit improves power supply circuit's operational reliability. In practical applications, the number and the resistance of the third resistors R3 may be set according to actual needs, and are not limited herein.

In some embodiments, referring to fig. 2 again, the power supply circuit further includes a fourth resistor R4. The fourth resistor R4 is connected between the first connection end POWER-and the second connection end POWER +. Specifically, a first end of the fourth resistor R4 is connected to the second connection terminal POWER +, a first end of the first resistor R1, and a cathode of the first diode D1, respectively, and a second end of the fourth resistor R4 is connected to the first connection terminal POWER-and a second end of the third resistor R3, respectively.

By arranging the fourth resistor R4, on one hand, the fourth resistor R4 is connected with the first resistor R1 and the first capacitor C1 in parallel, and can play a role in shunting at the moment of plugging the battery pack, so that the current output by the battery pack to the first resistor R1 and the first capacitor C1 is limited, devices in the power supply circuit are protected, and the working reliability of the power supply circuit is improved; on the other hand, the fourth resistor R4 is connected between the cathode of the first diode D1 and the first connection terminal POWER-, and can form a bleed-off loop of the first capacitor C1 together with the discharging unit 30 at the moment of unplugging the battery pack, so that the current flowing out of the base of the PNP triode in the discharging process of the first capacitor C1 can be large and small, thereby protecting devices in the POWER supply circuit and further improving the working reliability of the POWER supply circuit.

In some embodiments, referring to fig. 2, the power supply circuit further includes a fifth resistor R5. The first end of the fifth resistor R5 is connected to the first connection terminal POWER-, and the second end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, the third end of the charging unit 20 and the third end of the discharging unit 30, respectively. Specifically, the second end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, the first end of the first resistor R1, and the cathode of the first diode D1, respectively.

Through setting up fifth resistance R5, can constitute partial pressure module together with fourth resistance R4, can carry out the partial pressure to group battery voltage when the group battery is pegged graft in first connection end POWER-and second connection end POWER +, avoid the group battery to export the too high voltage to charging unit 20, avoid damaging the device, improve circuit operational reliability. In addition, in this embodiment, when the first capacitor C1 is fully charged, the voltage across the first capacitor C1 will be equal to the voltage across the fourth resistor R4, and it can be seen that the battery voltage, the fifth resistor R5 and the fourth resistor R4 will together determine the voltage across the first capacitor C1 when the charging of the first capacitor C1 is completed, that is, the voltage between the gate and the source of the NMOS transistor Q1.

In some embodiments, referring to fig. 2, the power supply circuit further includes a second diode ZD1. The cathode of the second diode ZD1 is connected to the third terminal of the first switch 10, and the anode of the second diode ZD1 is connected to the first terminal of the first switch 10. Specifically, the cathode of the second diode ZD1 is connected to the gate of the NMOS transistor Q1, the first end of the first capacitor C1, and the emitter of the PNP triode Q2, respectively, and the anode of the second diode ZD1 is connected to the second connection terminal POWER + and the source of the NMOS transistor Q1, respectively.

Specifically, the second diode ZD1 may be a zener diode, and the zener diode may be used to protect the voltage between the source and the gate of the NMOS transistor Q1 from being stabilized at a stable voltage value, protect the NMOS transistor Q1, and improve the reliability of the power supply circuit. And when the first capacitor C1 is full, the voltage at the two ends of the zener diode is equal to the voltage at the two ends of the first capacitor C1, so that the zener diode can be used for determining the voltage at the two ends of the first capacitor C1 when the charging of the first capacitor C1 is completed, and subsequently, by selecting a proper device model, the energy stored when the charging of the first capacitor C1 is completed can be ensured to avoid the PNP triode from being conducted by mistake and conduct the PNP triode when a discharge loop needs to be formed.

The specific operation of the power supply circuit provided in the present application is described in detail below with reference to the embodiment shown in fig. 2.

In the POWER supply circuit, at the time of t1, when the anode of the battery pack is plugged in the second connection end POWER +, and the cathode of the battery pack is plugged in the first connection end POWER-, the voltage of the second connection end POWER + is instantly increased to the voltage of the anode of the battery pack; at this time, because the voltage at the two ends of the first capacitor C1 does not suddenly change, the positive electrode of the battery pack charges the first capacitor C1 through the fifth resistor R5 and the first resistor R1, and the voltage at the first end of the first capacitor C1 will slowly rise, that is, the voltage of the first signal will slowly rise, that is, the gate voltage of the NMOS transistor Q1 will slowly rise, which is approximately a straight line. When the voltage of the first end of the first capacitor C1 is greater than or equal to the turn-on voltage of the NMOS transistor Q1, that is, the first signal voltage is greater than or equal to the turn-on voltage of the NMOS transistor Q1, that is, the gate voltage of the NMOS transistor Q1 is greater than or equal to the turn-on voltage, the NMOS transistor Q1 is turned on. Thus, the second end of the load 200 is connected to the negative electrode of the battery pack through the NMOS transistor Q1 and the first connection terminal POWER-, so that the positive electrode of the battery pack, the second connection terminal POWER +, the first end of the load 200, the second end of the load 200, the NMOS transistor Q1, the first connection terminal POWER-and the negative electrode of the battery pack form a loop, and the load 200 is powered by the battery pack. Therefore, the power supply circuit achieves the purpose of starting the NMOS tube Q1 in a delayed mode through the first resistor R1 and the first capacitor C1, so that the NMOS tube Q1 is started slowly, and spike voltage and circuits generated in the moment of plugging of a battery pack are avoided.

As will be understood, when the charging of the first capacitor C1 is completed, the voltage across the first capacitor C1 is equal to the voltage across the second diode ZD1 (zener diode). When the positive electrode of the battery pack is disconnected with the first connection end POWER-, and the negative electrode of the battery pack is disconnected with the second connection end POWER +, namely the battery pack is pulled out, the voltage of the first end of the first capacitor C1 is discharged through the emitting electrode of the PNP triode Q2, the base electrode of the PNP triode Q2 and the first connection end POWER-; at this moment, the PNP triode Q2 is turned on, the first end voltage of the first capacitor C1 is discharged through the PNP triode Q2, on one hand, the first end voltage of the first capacitor C1 is discharged through the emitter of the PNP triode Q2, the base of the PNP triode Q2 and the first connection terminal POWER-, on the other hand, the first end voltage of the first capacitor C1 is discharged through the emitter of the PNP triode Q2, the collector of the PNP triode Q2 and the first connection terminal POWER-, so that the gate voltage of the NMOS tube Q1 is rapidly reduced, the turn-off speed of the NMOS tube Q1 is increased, the situation that the NMOS tube Q1 vibrates when the battery pack is repeatedly plugged and pulled out is avoided, the NMOS tube Q1 is protected, and the reliability of the POWER supply circuit is improved.

In summary, the power supply circuit provided in the embodiment of the present application can slowly turn on the NMOS transistor Q1 through the charging unit 20 at the instant of plugging the battery pack, so as to avoid peak voltage and current and damage to the NMOS transistor Q1; simultaneously, in the twinkling of an eye is pulled out to the group battery, carry out bleeder voltage to charging unit 20 through discharging unit 20, improve NMOS pipe Q1's turn-off speed, prevent that the plug is undulant to cause the circuit to vibrate to as far as damage the device, improve the reliability of circuit work. In addition, this power supply circuit is built by conventional resistance, electric capacity and triode and forms, and the cost is lower and stability is high, and whole volume is less moreover, can adapt to miniaturized product.

In a second aspect, an embodiment of the present application further provides a power consumption device, where the power consumption device includes the power supply circuit according to any one of the first aspect. The electric equipment can be an unmanned aerial vehicle, an electric tool, an electric vehicle and the like. In this embodiment, the power supply circuit has the same structure and function as the power supply circuit in the above embodiments, and is not described herein again.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments may also be combined, the steps may be implemented in any order and there are many other variations of the different aspects of the present application described above which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply circuit, comprising: the NMOS tube, the charging unit and the discharging unit;

the source electrode of the NMOS tube, the first end of the charging unit and the first end of the discharging unit are all connected with a first connecting end, the drain electrode of the NMOS tube is used for connecting the first end of a load, the grid electrode of the NMOS tube is respectively connected with the second end of the charging unit and the second end of the discharging unit, the third end of the charging unit is connected with a second connecting end, the first connecting end is used for connecting the first end of a battery pack, and the second connecting end is used for connecting the second end of the battery pack and the second end of the load;

the charging unit is used for outputting a first signal to the NMOS tube through a second end of the charging unit, charging when the battery pack is connected between the first connecting end and the second connecting end so as to increase the voltage of the first signal, and discharging through the discharging unit when the battery pack is not connected between the first connecting end and the second connecting end so as to reduce the voltage of the first signal;

the NMOS tube is used for connecting or disconnecting the first connection end and the load according to the first signal.

2. The power supply circuit according to claim 1, wherein the charging unit includes a first resistor and a first capacitor;

the first end of the first resistor is connected with the second connecting end, the second end of the first resistor is respectively connected with the grid electrode of the NMOS tube, the first end of the first capacitor and the second end of the discharge unit, and the second end of the first capacitor is connected with the first connecting end.

3. The power supply circuit according to claim 1, wherein the discharge unit comprises a triode;

the first end of the triode is connected with the second end of the charging unit, the second end of the triode is respectively connected with the first connecting end, the second connecting end and the third end of the charging unit, and the third end of the triode is respectively connected with the first connecting end and the first end of the charging unit.

4. The power supply circuit according to claim 3, wherein the discharge unit further comprises a first diode;

and the cathode of the first diode is respectively connected with the second connecting end and the third end of the charging unit, and the anode of the first diode is connected with the second end of the triode.

5. The power supply circuit according to claim 4, wherein the discharge unit further includes a second resistor;

the second resistor is connected between the anode of the first diode and the second end of the triode.

6. The power supply circuit according to claim 4, wherein the discharge unit further comprises a third resistor;

the third resistor is connected between the third end of the triode and the first connecting end.

7. The power supply circuit according to claim 1, wherein the power supply circuit further comprises a fourth resistor;

the fourth resistor is connected between the first connecting end and the second connecting end.

8. The power supply circuit according to claim 7, wherein the power supply circuit further comprises a fifth resistor;

the first end of the fifth resistor is connected with the first connection end, and the second end of the fifth resistor is respectively connected with the first end of the fourth resistor, the third end of the charging unit and the third end of the discharging unit.

9. The power supply circuit according to any one of claims 1 to 7, wherein the power supply circuit further comprises a second diode;

the cathode of the second diode is connected with the grid electrode of the NMOS tube, and the anode of the second diode is connected with the source electrode of the NMOS tube.

10. An electric consumer, characterized in that it comprises a supply circuit according to any one of claims 1-9.