WO2020119722A1

WO2020119722A1 - Protection circuit, battery and aircraft

Info

Publication number: WO2020119722A1
Application number: PCT/CN2019/124577
Authority: WO
Inventors: 秦威; 孙雪峰
Original assignee: 深圳市道通智能航空技术有限公司
Priority date: 2018-12-12
Filing date: 2019-12-11
Publication date: 2020-06-18
Also published as: CN109361252A

Abstract

Disclosed are a protection circuit (100), a battery (400) and an aircraft (500). The protection circuit (100) comprises: a charging and discharging circuit (30), an over-voltage protection circuit (10) and a delay circuit (20), wherein the over-voltage protection circuit (10) and the delay circuit (20) are both connected to the charging and discharging circuit (30); when an input voltage input to the charging and discharging circuit (30) is greater than a pre-set voltage threshold value, the over-voltage protection circuit (10) is conducted, such that the charging and discharging circuit (30) is in a disconnected state, so as to cut off a charging and discharging loop; and when the input voltage is lowered from being greater than the pre-set voltage threshold value to being equal to the pre-set voltage threshold value, the over-voltage protection circuit (10) is disconnected, and the delay circuit (20) carries out delay, such that the charging and discharging circuit (30) enters a conducted state after a pre-set delay duration, and the charging and discharging loop is conducted. The protection circuit (100) can prevent normal power supply of the battery (400) from being affected and relevant components being damaged due to repeated fluctuations of the voltage output by the protection circuit (100) when same is at a critical point of over-voltage protection, such that the service lives of the battery (400) and the aircraft (500) are improved.

Description

Protection circuit, battery and aircraft

Technical field

The invention relates to the technical field of batteries, in particular to a protection circuit, a battery with the protection circuit, and an aircraft with the battery.

Background technique

The battery is an indispensable component for driving various electronic devices. For example, taking an aircraft, such as an unmanned aerial vehicle, as an example, powering various systems of the unmanned aerial vehicle through a battery, such as powering an unmanned aerial vehicle's power unit, to drive its motor to rotate, thereby driving its propeller to rotate, to realize the unmanned aerial vehicle Flight. In the application of batteries, in order to protect the battery itself and extend the service life of electronic equipment, some circuits with protection functions are usually provided in the power supply circuit of the battery to avoid abnormal power supply caused by the components of the battery or electronic equipment. damage. For example, the battery's power supply circuit is generally protected from overvoltage, such as setting a protection circuit that can achieve overvoltage protection, to avoid excessive voltage from causing greater damage to the components of the battery and electronic equipment, and extending the battery. And the service life of electronic equipment.

At present, the over-voltage protection usually adopts the following methods: when the voltage input into the protection circuit is too high, the protection circuit controls the battery power supply circuit to be disconnected to cut off the power supply loop; when the voltage input into the protection circuit is When the overvoltage is restored to the normal operating voltage range, the protection circuit controls the power supply circuit of the battery to be turned on, so that the battery can be normally charged and discharged.

In the process of implementing the present invention, the inventor found that there are at least the following problems in the related art: Although the above protection circuit can implement the overvoltage protection function, the above protection circuit often occurs repeated switching operations at the critical point of overvoltage protection , Resulting in the constant fluctuation of the voltage output by the protection voltage, affecting the normal power supply of the battery, even endangering the life of related components of electronic equipment, damaging electronic equipment, for example, leading to accidents such as drone bombers.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a protection circuit, battery and aircraft, which can avoid the repeated fluctuation of the voltage output by the protection circuit at the critical point of overvoltage protection, which affects the normal power supply of the battery and damages related components. In order to increase the service life of batteries and aircraft.

The embodiments of the present invention disclose the following technical solutions:

In a first aspect, an embodiment of the present invention provides a protection circuit, including:

The charge and discharge circuit includes: a charge and discharge input terminal, a charge and discharge output terminal, a first input control terminal and a second input control terminal, an input voltage is applied to the charge and discharge input terminal, and an output voltage is output by the charge and discharge output terminal;

The overvoltage protection circuit includes a protection input terminal and a protection output terminal, the protection input terminal is connected to the first input control terminal, and the protection output terminal is connected to the second input control terminal;

The delay circuit includes a delay input terminal and a delay output terminal, the delay input terminal is connected to the first input control terminal, and the delay output terminal is connected to the second input control terminal;

When the input voltage is greater than a preset voltage threshold, the overvoltage protection circuit is turned on, so that the charge and discharge circuit is in a disconnected state to cut off the charge and discharge circuit; when the input voltage is greater than the preset When the voltage threshold decreases to be equal to the preset voltage threshold, the overvoltage protection circuit is disconnected, and the delay circuit delays, so that the charge and discharge circuit enters a conductive state after a preset delay time, so that all The charge-discharge circuit is turned on.

In some embodiments, the overvoltage protection circuit includes: an isolation circuit and a switch circuit;

The isolation circuit is connected to the switch circuit, and the switch circuit is connected between the first input control terminal and the second input control terminal of the charge and discharge circuit;

When the input voltage is greater than a preset voltage threshold, the isolation circuit is turned on, so that the switch circuit is in a turned-on state, so that the charge-discharge circuit is in a turned-off state, to cut off the charge-discharge circuit.

In some embodiments, the isolation circuit includes an isolation diode, an anode of the isolation diode is grounded, and a cathode of the isolation diode is connected to the switching circuit.

In some embodiments, the switching circuit includes: a first resistor, a second resistor, and a transistor;

The first end of the first resistor is connected to the first input control end of the charge and discharge circuit as the protection input, and the first end of the first resistor is also connected to the emitter of the triode , The second end of the first resistor is connected to the first end of the second resistor, and the second end of the first resistor is also connected to the cathode of the isolation diode, the second of the second resistor The terminal is connected to the base of the triode, and the collector of the triode is used as the protection output terminal to be connected to the second input control terminal of the charge and discharge circuit;

When the input voltage is greater than a preset voltage threshold, the isolation diode is in a breakdown state, so that the transistor is turned on, so that the charge and discharge circuit is in a disconnected state to cut off the charge and discharge circuit.

In some embodiments, the overvoltage protection circuit further includes: a first zener diode, an anode of the first zener diode is connected to the base of the triode, and a cathode of the first zener diode is connected to all The emitter connection of the transistor is described.

In some embodiments, the delay circuit includes: a third resistor, a fourth resistor, and a capacitor;

The first end of the third resistor is connected to the first input control end of the charge and discharge circuit as the delay input, and the second end of the third resistor is used as the delay output and The second input control terminal of the charge and discharge circuit is connected, and the second terminal of the third resistor is also connected to the first terminal of the fourth resistor and the first terminal of the capacitor, the fourth Both the second end of the resistor and the second end of the capacitor are grounded;

When the input voltage is reduced from being greater than the preset voltage threshold to being equal to the preset voltage threshold, the capacitor is discharged through the fourth resistor to delay, so that the charge and discharge circuit passes the preset delay time Then enter the conducting state, so that the charging and discharging loop is conducting.

In some embodiments, the charge and discharge circuit includes a charge circuit and a discharge circuit; the charge circuit includes a charge input terminal, a first charge output terminal, and a second charge output terminal, and the discharge circuit includes a first discharge input terminal, The second discharge input terminal and discharge output terminal;

The charging input terminal serves as the charging and discharging input terminal for receiving the input voltage, and the first charging output terminal serves as the first input control terminal and the protection input terminal of the overvoltage protection circuit and the extension The delay input terminal of the time circuit is connected, and the first charging output terminal is connected to the first discharging input terminal, and the second charging output terminal serves as a second input control terminal and is protected by the overvoltage protection circuit The output terminal is connected to the delay output terminal of the delay circuit, and the second charging output terminal is connected to the second discharging input terminal, and the discharging output terminal serves as the charging and discharging output terminal for outputting Describe the output voltage;

When the overvoltage protection circuit is turned on, both the charging circuit and the discharging circuit work in an off state to cut off the charging and discharging loop; when the input voltage is reduced from greater than the preset voltage threshold to When it is equal to the preset voltage threshold, the overvoltage protection circuit is disconnected, and the delay circuit delays, so that the charging circuit and the discharge circuit enter the conductive state after a preset delay time, so that all The charge-discharge circuit is turned on.

In some embodiments, the charging circuit includes a first MOS tube, and the discharging circuit includes a second MOS tube;

The drain of the first MOS tube serves as the charge and discharge input terminal for receiving the input voltage, and the source of the first MOS tube serves as the protection of the first input control terminal and the overvoltage protection circuit The input terminal is connected to the delay input terminal of the delay circuit, and the source of the first MOS tube is connected to the source of the second MOS tube, and the gate of the first MOS tube serves as the second The input control terminal is connected to the protection output terminal of the overvoltage protection circuit and the delay output terminal of the delay circuit, and the gate of the first MOS tube is also connected to the gate of the second MOS tube The drain of the second MOS tube is used as the charge-discharge output terminal to output the output voltage.

In some embodiments, the discharge circuit further includes a second zener diode, the cathode of the second zener diode is connected to the source of the first MOS tube and the source of the second MOS tube, so The anode of the second zener diode is connected to the gate of the first MOS tube and the gate of the second MOS tube.

In a second aspect, an embodiment of the present invention provides a battery, including a case and a battery cell housed in the case, and the protection circuit described above, the battery cell is electrically connected to the protection circuit .

In some embodiments, the battery further includes an input positive electrode and an output positive electrode electrically connected to the battery cell, a charge and discharge input terminal of the protection circuit is connected to the input positive electrode, and a charge and discharge output of the protection circuit The terminal is connected to the positive output terminal.

In a third aspect, an embodiment of the present invention provides an aircraft including a fuselage, an arm connected to the fuselage, a power device provided on the arm, and a battery provided on the fuselage, The battery is the battery described above, and the battery is used to power the aircraft.

In various embodiments of the present invention, when the input voltage is greater than the preset voltage threshold, the overvoltage protection circuit of the protection circuit is turned on so that the charge and discharge circuit of the protection circuit is in the off state to cut off the charge and discharge circuit; when the input voltage When the preset voltage threshold is lower than the preset voltage threshold, the overvoltage protection circuit of the protection circuit is disconnected, and the delay circuit of the protection circuit delays, so that the charge and discharge circuit of the protection circuit passes the preset delay After a long time, it enters a conducting state, so that the charging and discharging circuit of the protection circuit is conducted. By delaying the delay circuit at the critical point of overvoltage protection, it can be avoided that at the critical point of overvoltage protection, the repeated fluctuation of the voltage output by the protection circuit affects the normal power supply of the battery and damages related components, so that Improve battery and aircraft life.

BRIEF DESCRIPTION

One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary descriptions do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the figures in the drawings do not constitute a scale limitation.

1 is a schematic diagram of a circuit structure of a protection circuit provided by an embodiment of the present invention;

2 is a circuit diagram of a protection circuit provided by an embodiment of the present invention;

3 is a circuit diagram of another protection circuit provided by an embodiment of the present invention;

4 is a schematic diagram of a battery provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of an aircraft provided by an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to another element or there may be a center element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not meant to be the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the invention herein is for the purpose of describing specific embodiments and is not intended to limit the invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as there is no conflict with each other.

The battery is an indispensable component for driving various electronic devices. For example, taking an aircraft, such as an unmanned aerial vehicle, as an example, powering various systems of the unmanned aerial vehicle through a battery, such as powering an unmanned aerial vehicle's power unit, to drive its motor to rotate, thereby driving its propeller to rotate, to realize the unmanned aerial vehicle Flight. Among them, in battery applications, overvoltage is a relatively common problem. The overvoltage may cause damage to the battery and components in the circuit due to heat, breakdown and burnout or even fire. For example, for drones, overvoltage will make the circuits of the drones work abnormally, and even lead to accidents such as drone bombing.

Therefore, in order to protect the battery itself and extend the service life of electronic equipment, the battery power supply circuit is usually protected from overvoltage. When the overvoltage occurs, the battery power supply circuit is cut off to avoid excessive voltage caused by the battery or Damage to components of electronic equipment.

At present, the conventional methods for overvoltage protection include: using processor detection and control to achieve overvoltage protection; using a dedicated overvoltage protection chip to achieve overvoltage protection, etc.

As for the detection and control method of the processor, because it is controlled by software and programs, it is prone to program failures such as program running and latching, and its reliability is not high.

Although the use of a dedicated overvoltage protection chip can avoid program failures such as program run-off and latch-up, this method has high cost and insufficient flexibility.

In addition, the current commonly used control methods for overvoltage protection are: when the input voltage is too high, the battery power supply circuit is disconnected to cut off the power supply circuit; when the overvoltage is restored to the normal operating voltage range At this time, the power supply circuit of the battery is controlled to be turned on so that the battery can be normally charged and discharged. Although this control method can realize the overvoltage protection function, but this method often occurs repeated switching operations at the critical point of protection, resulting in continuous fluctuations in the output voltage, affecting the normal power supply of the battery, and even endangering the related equipment of electronic equipment The longevity of components damages electronic equipment.

Based on the above circumstances, embodiments of the present invention provide a protection circuit, a battery, and an aircraft, where the protection circuit includes: an overvoltage protection circuit, a charge and discharge circuit, and a delay circuit. When the input voltage is greater than the preset voltage threshold, the overvoltage protection circuit of the protection circuit is turned on, so that the charge and discharge circuit of the protection circuit is in the off state to cut off the charge and discharge circuit; when the input voltage is greater than the preset voltage threshold When it is reduced to the preset voltage threshold, the overvoltage protection circuit of the protection circuit is disconnected, and the delay circuit of the protection circuit delays, so that the charge and discharge circuit of the protection circuit enters the conductive state after the preset delay time, so that The charge and discharge circuit of the protection circuit is turned on. The protection circuit can avoid the repeated fluctuation of the voltage output by the protection circuit at the critical point of overvoltage protection, which affects the normal power supply of the battery and damages related components, so as to improve the service life of the battery and the aircraft.

In addition, the protection circuit provided by the embodiment of the present invention is a hardware circuit constructed by electronic components. On the one hand, it can avoid program failures such as program run-off and latch-up, and improve the reliability of overvoltage protection; A dedicated overvoltage protection chip is used, so cost can be effectively saved, and the parameters of the electronic components in the protection circuit can be adjusted to adapt to different power supply needs, effectively improving the flexibility of overvoltage protection.

The protection circuit, battery, and aircraft provided by the embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of a protection circuit provided by an embodiment of the present invention. The protection circuit 100 includes an overvoltage protection circuit 10, a delay circuit 20, and a charge and discharge circuit 30. The overvoltage protection circuit 10 and the delay circuit 20 are both connected to the charge and discharge circuit 30.

Specifically, the charge and discharge circuit 30 includes a charge and discharge input terminal 301, a first input control terminal 302, a second input control terminal 303, and a charge and discharge output terminal 304. The overvoltage protection circuit 10 includes a protection input 101 and a protection output 102. The protection input terminal 101 is connected to the first input control terminal 302, and the protection output terminal 102 is connected to the second input control terminal 303. The delay circuit 20 includes a delay input terminal 201 and a delay output terminal 202. Wherein, the delay input terminal 201 is connected to the first input control terminal 302, and the delay output terminal 202 is connected to the second input control terminal 303.

In addition, the input voltage is applied to the charge and discharge input terminal 301 of the charge and discharge circuit 30, and the output voltage is output from the charge and discharge output terminal 304 of the charge and discharge circuit 30. The input voltage refers to the voltage input to the protection circuit 100, and the output voltage refers to the voltage output after the input voltage passes through the protection circuit 100, and the output voltage can be input into the electrical equipment to supply power to the electrical equipment.

For example, taking a battery as an example, the battery usually includes a battery cell for providing power. The battery cell may be electrically connected to the protection circuit 100 to input the input voltage output by the battery cell into the protection circuit 100. Specifically, the input voltage is input to the charge-discharge input terminal 301 of the charge-discharge circuit 30. The input voltage is processed by the protection circuit 100 to obtain an output voltage and output. Specifically, the output voltage is output from the charge-discharge output terminal 304 of the charge-discharge circuit 30 to an electric device connected to the battery, which is regarded as the electric device The power supply, for example, is output to the power device of the aircraft connected to the battery to drive the power device to work, thereby realizing the flight of the aircraft.

It should be noted that the above battery may be any type of battery, such as a lithium battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lead-acid battery, and so on. And the battery is made up of several single cells connected in series. The battery is formed by connecting several single cells in series in order to meet the power supply requirements of various electrical equipment. For example, to meet the power requirements of flying motors of UAVs and other aircraft. For example, the battery includes 4 or more single cells, that is, batteries, and the 4 or more batteries are connected in series to meet different power supply requirements.

When the input voltage is greater than the preset voltage threshold, the overvoltage protection circuit 10 is turned on, so that the charge and discharge circuit 30 is in a disconnected state to cut off the charge and discharge circuit; when the input voltage is greater than the When the preset voltage threshold is reduced to be equal to the preset voltage threshold, the overvoltage protection circuit 10 is disconnected, and the delay circuit 20 delays, so that the charge and discharge circuit 30 enters the guide after a preset delay time The on state makes the charge-discharge circuit conductive.

Wherein, the preset voltage threshold is a critical point of input voltage overvoltage. That is, the preset voltage threshold is used to define whether an overvoltage occurs. Specifically, when the input voltage is greater than the preset voltage threshold, it indicates that there is an overvoltage condition, and when the input voltage is less than or equal to the preset voltage threshold, it indicates that the input voltage is within the normal operating voltage range. If the input voltage is greater than the preset voltage threshold, that is, overvoltage occurs, it may cause damage to the battery and components in the circuit due to heat, breakdown and burnout or even fire. For example, lead to aircraft bombers.

It should be noted that the preset voltage threshold can be adjusted according to actual conditions to adapt to different power supply needs and different power supply needs.

With the protection circuit 100 provided in this embodiment, when the input voltage is greater than the preset voltage threshold, the overvoltage protection circuit 10 is turned on, so that the charge and discharge circuit 30 is in the off state to cut off the charge and discharge circuit; When the input voltage decreases from greater than the preset voltage threshold to equal to the preset voltage threshold, the overvoltage protection circuit 10 is disconnected, and the delay circuit 20 delays, so that the charge and discharge circuit 30 enters the conduction after a preset delay time The on state enables the charge and discharge loop to be turned on, which can effectively avoid the repeated fluctuation of the output voltage at the critical point of overvoltage protection, which affects the normal power supply of the battery and damages related components, so as to increase the service life of the battery and the aircraft.

2 and 3, the overvoltage protection circuit 10, the delay circuit 20, and the charge and discharge circuit 30 in the protection circuit 100 provided by the embodiment of the present invention will be described in detail.

As shown in FIG. 2, the overvoltage protection circuit 10 includes an isolation circuit 103 and a switch circuit 104. The isolation circuit 103 is connected to the switch circuit 104, and the switch circuit 104 is connected between the first input control terminal 302 and the second input control terminal 303 of the charge and discharge circuit 30 .

When the input voltage is greater than the preset voltage threshold, the isolation circuit 103 is turned on, so that the switch circuit 104 is in the on state, so that the charge and discharge circuit 30 is in the off state, to cut off the charge and discharge circuit, In order to achieve overvoltage protection, so as to prevent excessive voltage from affecting the normal power supply of the battery and damaging related components.

In some implementations, the isolation circuit 103 shown includes an isolation diode D1. Wherein, the anode of the isolation diode D1 is grounded GND, and the cathode of the isolation diode D1 is connected to the switching circuit 104.

When the input voltage does not exceed the preset voltage threshold, that is, when no overvoltage occurs, the isolation diode D1 is not broken down. At this time, the voltage of the anode of the isolation diode D1 is less than the voltage of the cathode of the isolation diode D1, The isolation diode D1 is in a reverse isolation state, so that the switch circuit 104 is in an off state, and then the charging and discharging circuit 30 is in a conducting state, so that the entire charging and discharging circuit is in a conducting state, and the battery can be normal Charge and discharge.

When the input voltage exceeds a preset voltage threshold, that is, when an overvoltage occurs, the voltage input to the anode of the isolation diode D1 is higher than the withstand voltage (regulation range) of the isolation diode D1, thereby making the isolation The diode D1 is broken down, and at this time, the isolation diode D1 is in a regulated state. For example, the voltage regulation range of the isolation diode D1 is between 17.6V-18.4V. When the voltage input to the anode of the isolation diode D1 is higher than the voltage regulation range, the isolation diode D1 is broken down to The switch circuit 104 is turned on, and the charge and discharge circuit 30 is turned off to cut off the charge and discharge circuit, thereby preventing damage to the battery and related components caused by excessive voltage.

It can be seen that the overvoltage value of the protection circuit 100 provided by the embodiment of the present invention can be achieved by adjusting the voltage regulation value of the isolation diode D1, so as to adapt to different power supply needs.

Since the response time of the isolation diode D1 is very short, using the isolation diode D1 can effectively improve the response speed of the protection circuit 100. The faster reaction speed can effectively prevent the over-voltage, quickly cut off the charge and discharge circuit, to avoid damage to the battery and related components. In addition, the cost of the isolation diode D1 is low, which can effectively save costs.

It should be noted that the isolation diode D1 may be any suitable diode, as long as it can achieve unidirectional conduction, that is, forward conduction and reverse blocking. For example, the isolation diode D1 may be a germanium diode (Ge tube), a silicon diode (Si tube), and so on.

In some implementations, the isolation diode D1 may be any type of diode. For example, the isolation diode D1 may be a diode of type BZX384-B18.

In some implementations, the switch circuit 104 includes a first resistor R1, a second resistor R2, and a transistor T1.

Wherein, the first end of the first resistor R1 is connected to the first input control end 302 of the charge and discharge circuit 30 as the protection input 101, and the first end of the first resistor R1 also Connected to the emitter (E pole) of the transistor T1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the first resistor R1 is also Connected to the cathode of the isolation diode D1, the second end of the second resistor R2 is connected to the base (pole B) of the transistor T1, and the collector (pole C) of the transistor T1 is used as the protection output The terminal 102 is connected to the second input control terminal 303 of the charging and discharging circuit 30.

Among them, the transistor T1 is a PNP transistor. The first resistor R1 and the second resistor R2 are current limiting resistors. The first resistor R1 is used for current limiting to prevent excessive current from damaging the isolation diode D1; the first resistor R2 is used for current limiting to prevent excessive current Damage the above transistor T1.

It should be noted that, in some other embodiments, the transistor T1 may be replaced with other devices that can realize the function of the transistor T1, and is not limited to the devices listed in FIG. 2 or FIG. 3. For example, the above-mentioned transistor T1 may also be an NPN type transistor. Or, replace the transistor T1 with a MOS tube.

Wherein, when the above transistor T1 is replaced with a MOS tube, the connection structure of the gate of the MOS tube in the circuit is the same as the connection structure of the base (B pole) of the transistor T1 in the circuit, and the source of the MOS tube is The connection structure in the circuit is the same as the connection structure of the emitter (E pole) of the triode T1 in the circuit, and the connection structure of the drain of the MOS transistor in the circuit and the collector (C pole) of the triode T1 in the circuit The structure is the same, so it will not be repeated here, please refer to the above description for details.

In some implementations, the transistor T1 may be any type of transistor, for example, the transistor T1 is a transistor of type MMBTA56, and so on.

In some embodiments, in order to further protect the components in the protection circuit 100, such as protecting the above-mentioned transistor T1, the overvoltage protection circuit 10 further includes: a first Zener diode ZD1, see FIG. 3 for details.

As shown in FIG. 3, the anode of the first zener diode ZD1 is connected to the base of the triode T1, and the cathode of the first zener diode ZD1 is connected to the emitter of the triode T1.

The first zener diode ZD1 is used to stabilize the voltage of the base and the emitter of the transistor T1 to prevent the excessively high voltage from damaging the first zener diode ZD1 so as to protect the first zener diode ZD1.

Wherein, the voltage stabilizing range of the first voltage stabilizing diode ZD1 depends on the withstand voltage values of the base and the emitter of the transistor T1. In order to protect the first voltage stabilizing diode ZD1, the voltage stabilizing range of the first voltage stabilizing diode ZD1 is smaller than the voltage resistance value of the base and emitter voltage values of the transistor T1.

It should be noted that the first voltage stabilizing diode ZD1 may be any suitable diode, as long as it can achieve a voltage stabilizing function. For example, the first Zener diode ZD1 may be a Zener diode of type BZX384-B3V6.

Please refer back to FIG. 2, the delay circuit 20 includes a third resistor R3, a fourth resistor R4 and a capacitor C1.

Wherein, the first end of the third resistor R3 is connected to the first input control end 302 of the charge and discharge circuit 30 as the delay input 201, and the second end of the third resistor R3 is used as the The delay output terminal 202 is connected to the second input control terminal 303 of the charge and discharge circuit 30, and the second terminal of the third resistor R3 is also connected to the first terminal of the fourth resistor R4 and the The first end of the capacitor C1 is connected, and the second end of the fourth resistor R4 and the second end of the capacitor C1 are both grounded to GND.

When the input voltage decreases from being greater than the preset voltage threshold to be equal to the preset voltage threshold, the capacitor C1 is discharged through the fourth resistor R4 to delay, so that the charge and discharge circuit 30 passes the preset After a delay time, it enters a conducting state, so that the charging and discharging loop is conducting.

Delay processing at the critical point of the overvoltage protection can avoid the voltage fluctuation input to the charge and discharge circuit 30, which causes the charge and discharge circuit 30 to repeatedly switch, resulting in unstable battery supply voltage and even damage to the battery or related components.

The preset delay time is determined by the resistance value of the fourth resistor R4, the capacitance value of the capacitor C1, the input voltage, and the turn-on voltage of the charging and discharging circuit 30.

Specifically, the preset delay time=-R*C*ln((E-V)/E). Where: "-" is the minus sign; R is the resistance value of the fourth resistor R4, the unit of R is ohm; C is the capacitance value of the capacitor C1, and the unit of C is F; E is the voltage between the series resistance and the capacitor C1 ; V is the voltage to be reached between capacitors C1; ln is the natural logarithm.

For example, taking an input voltage of 16V as an example, assuming that the resistance value of the fourth resistor R4 is 20KΩ, the capacitance value of the capacitor C1 is 1UF, and the turn-on voltage of the charging and discharging circuit 30 is 2.1V, the corresponding E=16V and V=16- 2.1=13.9V, according to the above formula, the preset delay time t=-20000*0.000001*ln((16-13.9)/16)≈40mS. That is, when the input voltage recovers from the overvoltage to the normal voltage (equal to the preset voltage threshold), it takes about 40mS before the charge and discharge circuit 30 will be turned on, delaying the conduction of the charge and discharge circuit to avoid the critical overvoltage point When the input voltage fluctuates, the loop charge-discharge circuit 30 repeatedly turns on or off, resulting in unstable output voltage and even damage to components.

As shown in FIG. 2, the charging and discharging circuit 30 includes a charging circuit 305 and a discharging circuit 306. Wherein, the charging circuit 305 and the discharging circuit 306 are connected.

Specifically, the charging circuit 305 includes a charging input terminal, a first charging output terminal, and a second charging output terminal. The discharge circuit 306 includes a first discharge input terminal, a second discharge input terminal, and a discharge output terminal.

The charging input terminal serves as the charging and discharging input terminal 301 for receiving the input voltage, and the first charging output terminal serves as a protection input for the first input control terminal 302 and the overvoltage protection circuit 10 The terminal 101 and the delay input terminal 201 of the delay circuit 20 are connected, and the first charging output terminal is connected to the first discharging input terminal, and the second charging output terminal serves as a second input control terminal 303 It is connected to the protection output terminal 102 of the overvoltage protection circuit 10 and the delay output terminal 202 of the delay circuit 20, and the second charging output terminal is connected to the second discharge input terminal, and the discharge The output terminal serves as the charging and discharging output terminal 304 for outputting the output voltage.

When the overvoltage protection circuit 10 is turned on, both the charging circuit 305 and the discharging circuit 306 work in an off state to cut off the charging and discharging circuit.

When the input voltage decreases from greater than the preset voltage threshold to equal to the preset voltage threshold, the overvoltage protection circuit 10 is disconnected, and the delay circuit 20 performs a delay to make the charging circuit 305 and The discharge circuit 306 enters a conductive state after a preset delay time, so that the charge-discharge circuit is conductive.

In some implementations, the charging circuit 305 includes a first MOS transistor Q1, and the discharging circuit 306 includes a second MOS transistor Q2. The first MOS transistor Q1 and the second MOS transistor Q2 are both P-type MOS transistors.

The drain (D pole) of the first MOS transistor Q1 is used as the charge and discharge input terminal 301 to receive the input voltage, and the source (S pole) of the first MOS transistor Q1 is used as the first An input control terminal 302 is connected to the protection input terminal 101 of the overvoltage protection circuit 10 and the delay input terminal 201 of the delay circuit 20, and the source (S pole) of the first MOS transistor Q1 is connected to The source (S pole) of the second MOS transistor Q2 is connected, and the gate (G pole) of the first MOS transistor Q1 serves as the second input control terminal 303 and the protection output terminal 102 of the overvoltage protection circuit 10 Is connected to the delay output terminal 202 of the delay circuit 20, and the gate (G pole) of the first MOS transistor Q1 is also connected to the gate (G pole) of the second MOS transistor Q2. The drain (D pole) of the second MOS transistor Q2 serves as the charge-discharge output terminal 304 for outputting the output voltage.

Among them, the relative connection position of the first MOS tube Q1 and the second MOS tube Q2 can not only cut off the charge and discharge circuit, but also turn off the reverse charging voltage, and also have the function of preventing reverse connection. That is, when charging the battery, if the charger is reversely connected to generate a reverse charging current, the first MOS transistor Q1 and the second MOS transistor Q2 can make the charge and discharge circuit 30 in the off state, thereby preventing the reverse The charging current flows into the battery to protect the battery and improve the safety of the battery.

It should be noted that in some other embodiments, the first MOS transistor Q1 and the second MOS transistor Q2 may also be replaced with other devices that can realize the functions of the first MOS transistor Q1 and the second MOS transistor Q2, and It is not limited to the devices listed in FIG. 2 or FIG. 3. For example, the first MOS transistor Q1 and the second MOS transistor Q2 may also be N-channel MOS transistors. Alternatively, a transistor is used to replace the first MOS transistor Q1 and the second MOS transistor Q2.

In addition, in some embodiments, the first MOS transistor Q1 is not an essential part of the protection circuit 100, that is, in some other embodiments, the first MOS transistor Q1 may be omitted. When the protection circuit 100 does not include the first MOS transistor Q1, the input voltage is directly applied to the protection input terminal 101 of the overvoltage protection circuit 10.

It should also be noted that the first MOS tube Q1 and the second MOS tube Q2 can be any suitable type of MOS tube. For example, the first MOS transistor Q1 and the second MOS transistor Q2 may be MOS transistors of type AON7409.

In some embodiments, in order to further protect the components in the protection circuit 100, such as protecting the second MOS transistor Q2, the charge-discharge circuit 30 further includes: a second Zener diode ZD2, as shown in FIG. 3 for details.

As shown in FIG. 3, the cathode of the second zener diode ZD2 is connected to the source of the first MOS transistor Q1 and the source of the second MOS transistor Q2, and the anode of the second zener diode ZD2 It is connected to the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2.

The second voltage stabilizing diode ZD2 is used to stabilize the voltage of the gate and source of the second MOS transistor Q2, to prevent excessive gate-source voltage from damaging the second MOS transistor Q2, so as to protect the second MOS transistor Q2.

Among them, the voltage stabilizing range of the second zener diode ZD2 depends on the withstand voltage value of the gate source of the second MOS transistor Q2. In order to protect the second MOS transistor Q2, the voltage stabilizing range of the second zener diode ZD2 is smaller than the withstand voltage value of the gate-source of the second MOS transistor Q2.

It should be noted that the second voltage stabilizing diode ZD2 may be any suitable diode, as long as it can realize the voltage stabilizing function. For example, the second Zener diode ZD2 may be a Zener diode of type BZX384-B18.

The following is the working principle of the protection circuit 100 provided by the embodiment of the present invention:

Please refer to FIG. 2 or FIG. 3, when the input voltage does not exceed the preset voltage threshold, that is, when the battery normally works without overvoltage, the isolation diode D1 is not broken down, at this time, the isolation diode D1 reverse isolation Therefore, if the voltage of the base and the emitter of the transistor T1 is the same, the transistor T1 is in the off state. Therefore, the voltages of the gates of the first MOS transistor Q1 and the second MOS transistor Q2 are the divided voltages of the third resistor R3 and the fourth resistor R4.

For example, taking an input voltage of 10V as an example, assuming that the resistance value of the third resistor R3 is 100KΩ and the resistance value of the fourth resistor R4 is 20KΩ, the voltages of the gates of the first MOS transistor Q1 and the second MOS transistor Q2 are 1.67V, so the gate source voltage of the first MOS transistor Q1 and the second MOS transistor Q2 is 8.33V, which meets the turn-on voltage requirements of the first MOS transistor Q1 and the second MOS transistor Q2, so the first MOS transistor Q1 and the second MOS transistor Q1 The second MOS transistor Q2 is in a conducting state, and the entire charge and discharge circuit is in a conducting state.

When the input voltage exceeds a preset voltage threshold, that is, when an overvoltage occurs, the isolation diode D1 is broken down, and the isolation diode D1 is in a regulated state at this time, if the starting voltage of the breakdown isolation diode D1 is about Between 17.6V-18.4V, the isolation diode D1 voltage regulation range is also between 17.6V-18.4V.

Since the isolation diode D1 is broken down, a current is generated between the base and the emitter of the transistor T1 due to the voltage difference, thereby driving the collector and the emitter of the transistor T1 to be conductive. After the transistor T1 is turned on, the gate voltages of the first MOS transistor Q1 and the second MOS transistor Q2 are equal to their source voltages, so the first MOS transistor Q1 and the second MOS transistor Q2 are in the off state, and the entire charge and discharge The circuit is in an open state.

When the input voltage recovers from exceeding the preset voltage threshold to be equal to the preset voltage threshold, that is, to the normal operating voltage, due to the existence of the delay circuit 20, the gate source of the first MOS transistor Q1 and the second MOS transistor Q2 The voltage will not immediately return to the normal value. At this time, the capacitor C1 is discharged through the fourth resistor R4, so that the gate voltages of the first MOS transistor Q1 and the second MOS transistor Q2 will slowly decrease to the normal value. For example, taking the preset delay time of the delay circuit 20 as an example, it takes about 40mS to pass before the charge and discharge circuit 30 is turned on, and the charge and discharge circuit is delayed to avoid the input voltage fluctuation at the critical overvoltage point , Causing the loop charge and discharge circuit 30 to repeatedly turn on or off, resulting in unstable output voltage and even damage to components.

In the embodiment of the present invention, when the input voltage is greater than the preset voltage threshold, the overvoltage protection circuit 10 of the protection circuit 100 is turned on, so that the charge and discharge circuit 30 of the protection circuit 100 is in an off state to cut off the charge and discharge circuit; When the input voltage decreases from greater than the preset voltage threshold to be equal to the preset voltage threshold, the overvoltage protection circuit 10 of the protection circuit 100 is disconnected, and the delay circuit 20 of the protection circuit 100 delays, so that the protection circuit 100 The charging and discharging circuit 30 enters a conductive state after a preset delay time, so that the charging and discharging circuit of the protection circuit 100 is conductive. By delaying the delay circuit 20 at the critical point of overvoltage protection, it is possible to avoid the repeated fluctuation of the voltage output by the protection circuit at the critical point of overvoltage protection, which affects the normal power supply of the battery and damages related components. In order to increase the service life of batteries and aircraft.

Moreover, since the protection circuit 100 is a pure hardware circuit built using diodes, transistors, MOS tubes, resistors, etc., it can effectively increase the response speed of the protection circuit 100, save costs, and is particularly suitable for overvoltage protection.

Please refer to FIG. 4, which is a schematic diagram of a battery provided by an embodiment of the present invention. The battery 400 may be a manganese zinc battery, a lead storage battery, a lithium battery, or other types of power supply modules. The battery 400 includes a case (not shown), and the battery cell 410 contained in the case as described above. Wherein, the battery core 410 is electrically connected to the protection circuit 100. The number of the battery cells 410 may be several, that is, in this embodiment, the number of the battery cells 410 is not limited. Among them, several cells 410 are connected in series to meet different power supply needs.

Moreover, in some embodiments, the battery 400 further includes an input positive electrode B+ and an output positive electrode PACK+ electrically connected to the battery cell 410. And the protection circuit 100 is connected between the input positive B+ and the output positive PACK+.

Specifically, the charge and discharge input terminal 301 of the protection circuit 100 is connected to the input positive electrode B+, and the charge and discharge output terminal 304 of the protection circuit 100 is connected to the output positive electrode PACK+.

The input positive electrode B+ of the battery 400 is the total positive terminal of the battery 400, that is, the highest voltage terminal of the battery 400. In addition, correspondingly, the battery 400 further includes an input negative electrode B-. The input negative electrode B- of the battery 400 is the total negative terminal of the battery 400, that is, the lowest voltage terminal of the battery 400.

The positive output PACK+ of the battery 400 is the positive output terminal of the battery 400. In addition, the output positive PACK+ of the battery 400 is also a positive charging port of the battery 400. In addition, correspondingly, the battery 400 further includes a battery output negative PACK-, the battery 400 output negative PACK- is the battery 400 negative output terminal, and the battery 400 output negative PACK- is the battery 400 negative electrode Charging port.

When the battery 400 is discharged, the discharge current is output from the input positive B+ of the battery 400 to the output positive PACK+ through the protection circuit 100, and then returned to the output negative PACK- of the battery through a load such as an electric device.

It should be noted that, in some embodiments, the protection circuit 100 may also be connected between the input negative electrode B- and the output negative electrode PACK-.

In the embodiment of the present invention, the protection circuit 100 of the battery 400 can avoid the repeated fluctuation of the voltage output by the protection circuit at the critical point of overvoltage protection, which affects the normal power supply of the battery and damages related components, so as to improve the battery and The service life of the aircraft.

Moreover, when the protection circuit 100 is disposed between the input positive electrode B+ and the output positive electrode PACK+, the power supply circuit of the battery 400 can be shut down more thoroughly, avoiding some leakage power consumption, etc., and reducing the power consumption of the route.

Please refer to FIG. 5, which is a schematic diagram of an aircraft according to an embodiment of the present invention. The aircraft 500 includes: a fuselage (not shown), an arm (not shown) connected to the fuselage, a power device 510 provided on the arm, and a battery provided on the fuselage . The battery of the aircraft 500 may be the battery 400 described above. The battery 400 is used to power the aircraft 500.

The battery 400 can realize that at the critical point of overvoltage protection, it can avoid the repeated fluctuation of the voltage output by the protection circuit and affect the normal power supply of the battery and damage related components, thereby ensuring the flight safety of the aircraft 500 and avoiding the accident of bombing. .

Among them, the aircraft 500 may be an unmanned aerial vehicle, an unmanned boat, or other movable devices. Taking a drone as an example, the drone may be a rotorcraft (rotorcraft), for example, a multi-rotor aircraft propelled by multiple propulsion devices through air. The embodiments of the present invention are not limited thereto, and the drone may also be Other types of drones, such as fixed-wing drones, unmanned airships, umbrella-wing drones, flapping-wing drones, etc.

Among them, the battery 400 is respectively connected to the power device 510, the flight control system, the gimbal, and the image acquisition device to provide power for the power device, the flight control system, the gimbal, and the image acquisition device. For example, the battery 400 provides power to the power unit 510 and the flight control system, so as to ensure the normal operation of the power unit 510 and the flight control system, so as to realize the flight of the aircraft 500 and thereby complete the designated flight mission.

In addition, the power device 510 is installed in the arm of the aircraft 500, the flight control system is installed in the fuselage of the aircraft 500, and the gimbal is installed in the fuselage of the aircraft 500. The flight control system can be combined with the power device 510, the gimbal, and the image acquisition device Couple to achieve communication.

The power device 510 may include an electronic governor (abbreviated as electric governor), one or more propellers, and one or more motors corresponding to the one or more propellers, wherein the motor is connected between the electronic governor and the propeller The motor and propeller are provided on the corresponding arm of the aircraft 500.

The electronic governor is used to receive the driving signal generated by the flight control system and provide the driving current to the motor according to the driving signal to control the speed of the motor. The motor is used to drive the propeller to rotate, thereby providing power for the flight of the aircraft 500, which enables the aircraft 500 to achieve one or more degrees of freedom of movement. In some embodiments, aircraft 500 may rotate about one or more axes of rotation. For example, the rotation axis may include a roll axis, a pan axis, and a pitch axis. It can be understood that the motor may be a DC motor or an AC motor. In addition, the motor may be a brushless motor or a brush motor.

The flight control system may include a flight controller and a sensing system. The flight controller is connected to the sensing system.

The sensor system is used to measure the attitude information of the aircraft 500, that is, the position information and status information of the aircraft 500 in space, for example, three-dimensional position, three-dimensional angle, three-dimensional velocity, three-dimensional acceleration, and three-dimensional angular velocity. The sensing system may include, for example, at least one of a gyroscope, an electronic compass, an inertial measurement unit (IMU), a visual sensor, a global navigation satellite system, and a barometer. For example, the global navigation satellite system may be a global positioning system (Global Positioning System, GPS). The flight controller is used to control the flight of the aircraft 500, for example, the flight of the aircraft 500 can be controlled according to the attitude information measured by the sensor system.

It can be understood that the flight controller can control the aircraft 500 according to pre-programmed program instructions, and can also control the aircraft 500 by responding to one or more control instructions from other devices.

The gimbal can include ESCs and motors. Among them, the ESC of the gimbal is connected to the motor. The gimbal is used to carry an image acquisition device. The flight controller can control the movement of the gimbal through ESC and motor.

Optionally, in some other embodiments, the gimbal may further include a controller for controlling the motion of the gimbal by controlling the ESC and the motor. It can be understood that the gimbal may be independent of the aircraft 500, or may be a part of the aircraft 500. It can be understood that the motor of the gimbal may be a DC motor or an AC motor. In addition, the motor of the gimbal can be a brushless motor or a brush motor. It can also be understood that the gimbal can be located at the top of the fuselage or at the bottom of the fuselage.

The image acquisition device may be a device for capturing images, such as a camera or a video camera, and the image acquisition device may communicate with the flight control system and shoot under the control of the flight control system.

It can be understood that the above naming of the components of the aircraft 500 is for identification purposes only, and should not be construed as limiting the embodiments of the present invention.

Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, rather than limiting them; under the idea of the present invention, the technical features in the above embodiments or different embodiments may also be combined, The steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above. For simplicity, they are not provided in the details; although the present invention has been described in detail with reference to the foregoing embodiments, it is common in the art The skilled person should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the implementation of this application. Examples of technical solutions.

Claims

A protection circuit is characterized by comprising:

The charge and discharge circuit includes: a charge and discharge input terminal, a charge and discharge output terminal, a first input control terminal and a second input control terminal, an input voltage is applied to the charge and discharge input terminal, and an output voltage is output by the charge and discharge output terminal;

The overvoltage protection circuit includes a protection input terminal and a protection output terminal, the protection input terminal is connected to the first input control terminal, and the protection output terminal is connected to the second input control terminal;

The delay circuit includes a delay input terminal and a delay output terminal, the delay input terminal is connected to the first input control terminal, and the delay output terminal is connected to the second input control terminal;

When the input voltage is greater than a preset voltage threshold, the overvoltage protection circuit is turned on, so that the charge and discharge circuit is in a disconnected state to cut off the charge and discharge circuit; when the input voltage is greater than the preset When the voltage threshold decreases to be equal to the preset voltage threshold, the overvoltage protection circuit is disconnected, and the delay circuit delays, so that the charge and discharge circuit enters a conductive state after a preset delay time, so that all The charge-discharge circuit is turned on.
The protection circuit according to claim 1, wherein the overvoltage protection circuit comprises: an isolation circuit and a switch circuit;

The isolation circuit is connected to the switch circuit, and the switch circuit is connected between the first input control terminal and the second input control terminal of the charge and discharge circuit;

When the input voltage is greater than a preset voltage threshold, the isolation circuit is turned on, so that the switch circuit is in a turned-on state, so that the charge-discharge circuit is in a turned-off state, to cut off the charge-discharge circuit.
The protection circuit according to claim 2, wherein the isolation circuit includes an isolation diode, an anode of the isolation diode is grounded, and a cathode of the isolation diode is connected to the switching circuit.
The protection circuit according to claim 3, wherein the switching circuit comprises: a first resistor, a second resistor and a transistor;

The first end of the first resistor is connected to the first input control end of the charge and discharge circuit as the protection input, and the first end of the first resistor is also connected to the emitter of the triode , The second end of the first resistor is connected to the first end of the second resistor, and the second end of the first resistor is also connected to the cathode of the isolation diode, the second of the second resistor The terminal is connected to the base of the triode, and the collector of the triode is used as the protection output terminal to be connected to the second input control terminal of the charge and discharge circuit;

When the input voltage is greater than a preset voltage threshold, the isolation diode is in a breakdown state, so that the transistor is turned on, so that the charge and discharge circuit is in a disconnected state to cut off the charge and discharge circuit.
The protection circuit according to claim 4, wherein the overvoltage protection circuit further comprises: a first zener diode, an anode of the first zener diode is connected to a base of the triode, the first The cathode of a zener diode is connected to the emitter of the triode.
The protection circuit according to any one of claims 1 to 5, wherein the delay circuit includes: a third resistor, a fourth resistor, and a capacitor;

The first end of the third resistor is connected to the first input control end of the charge and discharge circuit as the delay input, and the second end of the third resistor is used as the delay output and The second input control terminal of the charge and discharge circuit is connected, and the second terminal of the third resistor is also connected to the first terminal of the fourth resistor and the first terminal of the capacitor, the fourth Both the second end of the resistor and the second end of the capacitor are grounded;

When the input voltage is reduced from being greater than the preset voltage threshold to being equal to the preset voltage threshold, the capacitor is discharged through the fourth resistor to delay, so that the charge and discharge circuit passes the preset delay time Then enter the conducting state, so that the charging and discharging loop is conducting.
The protection circuit according to any one of claims 1 to 6, wherein the charge and discharge circuit includes a charge circuit and a discharge circuit; the charge circuit includes a charge input terminal, a first charge output terminal, and a second charge output Terminal, the discharge circuit includes a first discharge input terminal, a second discharge input terminal, and a discharge output terminal;

The charging input terminal serves as the charging and discharging input terminal for receiving the input voltage, and the first charging output terminal serves as the first input control terminal and the protection input terminal of the overvoltage protection circuit and the extension The delay input terminal of the time circuit is connected, and the first charging output terminal is connected to the first discharging input terminal, and the second charging output terminal serves as a second input control terminal and is protected by the overvoltage protection circuit The output terminal is connected to the delay output terminal of the delay circuit, and the second charging output terminal is connected to the second discharging input terminal, and the discharging output terminal serves as the charging and discharging output terminal for outputting Describe the output voltage;

When the overvoltage protection circuit is turned on, both the charging circuit and the discharging circuit work in an off state to cut off the charging and discharging loop; when the input voltage is reduced from greater than the preset voltage threshold to When it is equal to the preset voltage threshold, the overvoltage protection circuit is disconnected, and the delay circuit delays, so that the charging circuit and the discharge circuit enter the conductive state after a preset delay time, so that all The charge-discharge circuit is turned on.
The protection circuit according to claim 7, wherein the charging circuit includes a first MOS tube, and the discharging circuit includes a second MOS tube;

The drain of the first MOS tube serves as the charge and discharge input terminal for receiving the input voltage, and the source of the first MOS tube serves as the protection of the first input control terminal and the overvoltage protection circuit The input terminal is connected to the delay input terminal of the delay circuit, and the source of the first MOS tube is connected to the source of the second MOS tube, and the gate of the first MOS tube serves as the second The input control terminal is connected to the protection output terminal of the overvoltage protection circuit and the delay output terminal of the delay circuit, and the gate of the first MOS tube is also connected to the gate of the second MOS tube The drain of the second MOS tube is used as the charge-discharge output terminal to output the output voltage.
The protection circuit according to claim 8, wherein the discharge circuit further includes a second zener diode, a cathode of the second zener diode, a source of the first MOS tube, and the second The source of the MOS tube is connected, and the anode of the second zener diode is connected to the gate of the first MOS tube and the gate of the second MOS tube.
A battery comprising a casing and a battery cell accommodated in the casing, characterized in that the battery further comprises the protection circuit according to any one of claims 1-9, the battery cell and the protection The circuit is electrically connected.
The battery according to claim 10, wherein the battery further includes an input positive electrode and an output positive electrode electrically connected to the battery cell, and a charge and discharge input terminal of the protection circuit is connected to the input positive electrode, the The charge-discharge output terminal of the protection circuit is connected to the output positive electrode.
An aircraft includes a fuselage, an arm connected to the fuselage, a power device provided on the arm, and a battery provided on the fuselage, characterized in that the battery is claim 10 or 11 The battery is used to power the aircraft.