Protection circuit

Abstract

The embodiment of the utility model relates to the field of circuits, and provides a protection circuit, which comprises a power supply module and a protection circuit, the functional module is electrically connected with the power supply module, and the power supply module is used for supplying power to the functional module; and the control module is electrically connected with the capacitor of the power supply module, and the control module is also electrically connected between the function module and the ground end to control the connection and disconnection between the ground end and the function module. And the functional module can be protected from being damaged when the power supply module suddenly powers down.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the field of circuits, and in particular, to a protection circuit. Background Art

[0002] With the development of technology, the use of electrical appliances has become more and more popular. Most products driven by electricity have on / off buttons, but the on / off buttons designed for different products are different.

[0003] The on / off buttons of most products are designed at the main power supply. When the switch is turned off, the main power supply to the internal circuit board of the product will be immediately cut off.

[0004] However, the method of directly cutting off the main power supply has certain potential safety hazards and can cause damage to functional devices. Utility Model Content

[0005] Embodiments of the present disclosure provide a protection that can at least protect the functional module from damage when the power module loses power.

[0006] According to some embodiments of the present disclosure, on the one hand, an embodiment of the present disclosure provides a protection circuit, including: a power module, where at least one capacitor is included in the power module; a functional module, the functional module is electrically connected to the power module, and the power module is used to supply power to the functional module; a control module, the control module is electrically connected to the capacitor of the power module, and the control module is also electrically connected between the functional module and the ground terminal to control the conduction and disconnection between the ground terminal and the functional module.

[0007] In some embodiments, the control module includes: a first sub-control module, the first sub-control module is electrically connected to the power module; a second sub-control module, the second sub-control module is electrically connected to the first sub-control module, and the second sub-control module is electrically connected between the functional module and the ground terminal to receive a signal from the first sub-control module to control the conduction and disconnection between the ground terminal and the control module.

[0008] In some embodiments, the first sub-control module includes: a PMOS transistor, the gate of the PMOS transistor is electrically connected to the power module, the source of the PMOS transistor is electrically connected to the power module, and the drain of the PMOS transistor is electrically connected to the second sub-control module.

[0009] In some embodiments, the first sub-control module further includes: a first resistor, one end of the first resistor is electrically connected to the power module, and the other end is electrically connected to the ground terminal.

[0010] In some embodiments, the first sub-control module further includes: a second resistor, one end of the second resistor is electrically connected to the drain of the PMOS transistor, and the other end is electrically connected to the second sub-control module.

[0011] In some embodiments, the first sub-control module further includes: a third resistor, one end of the third resistor is electrically connected to the power supply module, and the other end is electrically connected to the gate of the PMOS transistor.

[0012] In some embodiments, the resistance value of the second resistor is equal to the resistance value of the third resistor.

[0013] In some embodiments, the second sub-control module includes: a control terminal; an NMOS transistor, the gate of the NMOS transistor is electrically connected to the control terminal, the gate of the NMOS transistor is electrically connected to the drain of the PMOS transistor, the drain of the NMOS transistor is electrically connected to the functional module, the source of the NMOS transistor is electrically connected to the ground terminal, and the NMOS transistor receives signals from the control terminal and the first sub-control module to control the conduction and disconnection between the ground terminal and the control module.

[0014] In some embodiments, the second sub-control module further includes: a fourth resistor, one end of the fourth resistor is electrically connected to the gate of the NMOS transistor, and the other end is electrically connected to the ground terminal.

[0015] In some embodiments, the second sub-control module further includes: a fifth resistor, one end of the fifth resistor is electrically connected to the control terminal, and the other end is electrically connected to the gate of the NMOS transistor.

[0016] The technical solution provided by the embodiments of the present disclosure has at least the following advantages: The functional module is the part that realizes the function in the protection circuit, and the power supply module is the part that provides power. By setting the control module to be electrically connected to the capacitor of the power supply module, for the capacitor, when the power supply module suddenly loses power, due to the characteristics of the capacitor, it will release the stored charge after power-off. When the control module loses power, on the one hand, it receives the power supply from the capacitor to maintain the normal working state, and on the other hand, it waits to receive the shutdown signal. When the path between the functional module and the ground terminal is conducted, the functional module will execute the correct shutdown process, thereby achieving the purpose of protecting the functional module. Description of the Drawings

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or in the prior art, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. [0000040] is a circuit diagram of a protection circuit provided by an embodiment of the present disclosure;

[0019] Figure 2 FIG. [0000043] is another circuit diagram of a protection circuit provided by an embodiment of the present disclosure. Detailed implementation manners

[0020] As can be seen from the background art, currently, when the main power supply is directly disconnected, it will cause damage to the functional module. For example, when some modules are performing the operation of writing to Flash, if the power supply is suddenly lost, there is a high possibility that the Flash will be damaged, and then unpredictable problems will occur in the entire product.

[0021] The embodiment of the present disclosure provides a protection circuit. The functional module is the part that realizes the function in the protection circuit, and the power supply module is the part that provides the power supply. By setting the control module to be electrically connected to the capacitor of the power supply module, for the capacitor, when the power supply module suddenly loses power, due to the characteristics of the capacitor, it will release the stored charge after power-off. When the power is off, on the one hand, the control module receives the power supply from the capacitor to maintain the normal working state, and on the other hand, it waits to receive the shutdown signal. When the path between the functional module and the ground terminal is conducted, the functional module will execute the correct shutdown process, thereby achieving the purpose of protecting the functional module.

[0022] The following will elaborate on the embodiments of the present disclosure with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are proposed for the readers to better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the present disclosure can still be implemented.

[0023] Terms such as first or second can be used to describe various components, but these components are not limited by the above terms. The above terms are used to distinguish one component from another. For example, without departing from the scope of the concept of the present disclosure, the first component can be called the second component, and similarly, the second component can be called the first component.

[0024] In addition, "connected / coupled" means that one component is directly electrically coupled to another component or indirectly electrically coupled through another component. As long as it is not explicitly stated in the sentence, the singular form may include the plural form. In addition, "comprising / including" or "comprises / includes" as used in this specification means the presence or addition of one or more components, steps, operations, and elements. The specific structural or functional descriptions of examples of embodiments according to the concepts disclosed in this specification are merely illustrated to describe examples of embodiments according to the concepts, and examples of embodiments according to the concepts may be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0025] According to the concepts, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the drawings and described in the specification. However, examples of embodiments according to the concepts are not limited to specific embodiments, but include all changes, equivalents, or alternatives included within the spirit and technical scope of this disclosure.

[0026] It should be understood that when describing that one element is "coupled" or "connected" to another element, the element can be directly coupled or directly connected to the other element, or can be coupled or connected to the other element through a third element. Conversely, it should be understood that when an element is said to be "directly connected to" or "directly coupled to" another element, no other elements are placed between them. Other expressions describing the relationship between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0027] The terms used in this specification are only for describing specific examples of embodiments and are not intended to limit this disclosure. If there is no clear contrary meaning in the context, the singular form may include the plural form. In this specification, it should be understood that the term "comprising" or "having" indicates the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but does not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0028] If there is no contrary definition, all terms used herein (including technical terms or scientific terms) have the same meaning as generally understood by those of ordinary skill in the art. If terms defined in a common dictionary are not clearly defined in this specification, they should be interpreted as having the same meaning as in the context of the related art, and not as an ideal or overly formal meaning.

[0029] Descriptions of well-known components and processing techniques may be omitted so as not to unnecessarily obscure the embodiments of this disclosure.

[0030] Throughout the specification, the same reference numerals refer to the same elements. Thus, even if a reference numeral is not mentioned or described with reference to one drawing, it can be mentioned or described with reference to another drawing. In addition, even if a reference numeral is not shown in one drawing, it can be mentioned or described with reference to another drawing.

[0031] In addition, the logic level of a signal can be different from or opposite to the described logic level. For example, a signal described as having a logic "high" level can alternatively have a logic "low" level, and a signal described as having a logic "low" level can alternatively have a logic "high" level.

[0032] Reference Figure 1 and Figure 2 , Figure 1 is a circuit diagram of a protection circuit provided by an embodiment of the present disclosure. Figure 2 is another circuit diagram of a protection circuit provided by an embodiment of the present disclosure.

[0033] In some embodiments, the protection circuit may include: a power supply module 100, and at least one capacitor C1 is included in the power supply module 100.

[0034] The protection circuit may further include: a function module 101, the function module 101 is electrically connected to the power supply module 100, and the power supply module 100 supplies power to the function module 101.

[0035] The protection circuit may further include: a control module 102, the control module 102 is electrically connected to the capacitor C1 of the power supply module 100, and the control module 102 is also electrically connected between the function module 101 and the ground terminal to control the conduction and disconnection between the ground terminal and the function module 101.

[0036] The function module 101 is also the part that realizes the function in the protection circuit, and the power supply module 100 is also the part that provides power. By setting the control module 102 to be electrically connected to the capacitor C1 of the power supply module 100, for the capacitor C1, when the power supply module 100 suddenly loses power, due to the characteristics of the capacitor C1, it will release the stored charge after power-off. When the power is off, on the one hand, the control module 102 receives the power supply from the capacitor C1 to maintain the normal working state, and on the other hand, it waits to receive the shutdown signal. When the path between the function module 101 and the ground terminal is conducted, it will cause the function module 101 to execute the correct shutdown process, thereby achieving the purpose of protecting the function module 101.

[0037] In some embodiments, the power supply module 100 may include a main power supply module 110, a small power supply module 120, and a capacitor C1. Among them, the main power supply module 110 may be a device mainly used to receive and provide power. For example, the main power supply module 110 may be an adapter. When the adapter is connected to the power supply, the main power supply module 110 operates and outputs power. When the main power supply module 110 loses power, all the power supplies of the entire system will lose power and shut down within a short time. The small power supply module 120 may be a module electrically connected to the main power supply module 110, and may be a power supply generated after being converted by multiple power chips. The capacitor C1 may be selected as a relatively large capacitor to maintain the operation of the functional module 101 within a short time when the main power supply module 110 loses power.

[0038] In some embodiments, the functional module 101 may be any electrical device, which conducts and operates when receiving power supply from the power supply module 100, and controls the functional module 101 to stop working and perform a shutdown process when the functional module 101 is electrically connected to the ground terminal.

[0039] In some embodiments, under normal circumstances, the functional module 101 receives power supply from the power supply module 100 and operates normally. When the power supply module 100 suddenly loses power, the capacitor C1 provides an electrical signal to the functional module 101 and the control module 102, controls the functional module 101 to continue running, and enables the control module 102 to control the conduction between the functional module 101 and the ground terminal, so that the functional module 101 executes a normal shutdown process to protect the functional module 101.

[0040] In some embodiments, the control module 102 is also electrically connected to the power supply module 100, receives the power supply provided by the power supply module 100, and normally controls the turning on and off of the functional module 101. When the power supply module 100 suddenly loses power, the control module 102 receives an electrical signal from the capacitor C1 and controls the functional module 101 to close normally, thereby protecting the functional module 101.

[0041] In some embodiments, the control module 102 may include: a first sub-control module 112, which is electrically connected to the power supply module 100; a second sub-control module 122, which is electrically connected to the first sub-control module 112, and the second sub-control module 122 is electrically connected between the functional module 101 and the ground terminal, and receives the signal of the first sub-control module 112 to control the conduction and disconnection between the ground terminal and the control module 102.

[0042] The first sub-control module 112 is electrically connected to the power supply module 100. In the normal state, the first sub-control module 112 does not transmit signals to the second sub-control module 122. When the second sub-control module 122 does not receive the signal from the first sub-control module 112, the path between the ground terminal and the control module 102 is disconnected. When the power supply module 100 suddenly loses power, the first sub-control module 112 transmits a signal to the second sub-control module 122, and the charge of the capacitor C1 is also temporarily supplied to the functional module 101 to delay the turn-off of the functional module 101. At the same time, the second sub-control module 122 receives the signal and controls the conduction between the ground terminal and the control module, so that the ground terminal and the functional module 101 are conducted, thereby controlling the functional module 101 to perform a normal shutdown operation.

[0043] In some embodiments, the first sub-control module 112 may further include: a PMOS transistor T1. The gate of the PMOS transistor T1 is electrically connected to the power supply module 100, the source of the PMOS transistor T1 is electrically connected to the power supply module 100, and the drain of the PMOS transistor T1 is electrically connected to the second sub-control module 122. In the normal state, the power supply module 100 provides a high-level signal to the gate of the PMOS transistor T1. Based on the characteristics of the PMOS transistor T1, when the power supply module 100 provides a high-level signal to the gate of the PMOS transistor T1, the PMOS transistor T1 is turned off and does not provide a signal to the second sub-control module 122; when the power supply module 100 suddenly disconnects, the power supply module 100 provides a low-level signal to the gate of the PMOS transistor T1. Based on the characteristics of the PMOS transistor T1, the PMOS transistor T1 is turned on, thereby providing a signal to the second sub-control module 122, thereby controlling the conduction between the ground terminal and the control module 102, so that the functional module 101 receives a shutdown signal, thereby controlling the functional module 101 to perform a normal shutdown operation.

[0044] In some embodiments, it may be the main power supply module 110 that is electrically connected to the gate of the PMOS transistor T1.

[0045] In some embodiments, the first sub-control module 112 may further include: a first resistor R1. One end of the first resistor R1 is electrically connected to the power supply module 100, and the other end is electrically connected to the ground terminal. By setting the first resistor R1, it can ensure that the power supply module 100 provides stable high-level and low-level signals to the PMOS transistor T1.

[0046] In some embodiments, the resistance value of the first resistor R1 may exceed 1 megohm, so that the first resistor R1 can ensure that the power supply module 100 provides stable high-level and low-level signals to the PMOS transistor T1 with a better effect.

[0047] In some embodiments, the first sub-control module 112 may further include: a second resistor R2. One end of the second resistor R2 is electrically connected to the drain of the PMOS transistor T1, and the other end is electrically connected to the second sub-control module 122. By setting the second resistor R2, the current signal output from the first sub-control module 112 to the second sub-control module 122 can be limited. For example, when the first sub-control module 112 is turned on, the first sub-control module 112 will transmit current to the second sub-control module 122. By setting the second resistor R2, the current transmitted from the first sub-control module 112 to the second sub-control module 122 can be limited, thereby preventing the current transmitted from the first sub-control module 112 to the second sub-control module 122 from being too large.

[0048] In some embodiments, the resistance value of the second resistor R2 may be 5 kΩ to 20 kΩ. By setting the resistance of the second resistor R2 to be 5 kΩ to 20 kΩ, the effect of the second resistor R2 in controlling the current can be ensured.

[0049] In some embodiments, the first sub-control module 112 further includes: a third resistor R3. One end of the third resistor R3 is electrically connected to the power supply module 100, and the other end is electrically connected to the gate of the PMOS transistor T1. By setting the third resistor R3, the current signal output from the power supply module 100 to the PMOS transistor T1 can be limited, thereby preventing the current transmitted from the power supply module 100 to the PMOS transistor T1 from being too large.

[0050] In some embodiments, the resistance value of the second resistor R2 is equal to the resistance value of the third resistor R3. By setting the resistance value of the second resistor R2 to be equal to the resistance value of the third resistor R3, on the one hand, it is convenient to select components for the entire protection circuit, thereby reducing the difficulty of constructing the entire protection circuit. On the other hand, the resistance of the entire protection circuit can also be reduced.

[0051] In some embodiments, the resistance value of the third resistor R3 may be 5 kΩ to 20 kΩ. By setting the resistance of the third resistor R3 to be 5 kΩ to 20 kΩ, the effect of the third resistor R3 in controlling the current can be ensured.

[0052] In some embodiments, the second sub-control module 122 includes: a control terminal 142; an NMOS transistor T2. The gate of the NMOS transistor T2 is electrically connected to the control terminal 142, the gate of the NMOS transistor T2 is electrically connected to the drain of the PMOS transistor T1, the drain of the NMOS transistor T2 is electrically connected to the functional module 101, the source of the NMOS transistor T2 is electrically connected to the ground terminal, and the NMOS transistor T2 receives signals from the control terminal 142 and the first sub-control module 112 to control the conduction and disconnection between the ground terminal and the control module 142.

[0053] It can be understood that the control terminal 142 can control the functional module 101 to execute a normal shutdown instruction under normal circumstances. For example, when the functional module 101 needs to be shut down normally, a high-level signal can be output to the NMOS transistor T2 through the control terminal 142. At this time, the NMOS transistor T2 is turned on, and the electrical connection path between the functional module 101 and the ground terminal is turned on, and the functional module 101 performs a shutdown operation. Correspondingly, during the normal operation of the functional module 101, the control terminal 142 can always provide a low-level signal to control the NMOS transistor T2 not to conduct, and the electrical connection path between the functional module 101 and the ground terminal is disconnected, so that the functional module 101 can operate normally.

[0054] For the NMOS transistor T2, the gate of the NMOS transistor T2 is electrically connected to both the control terminal 142 and the first sub-control module 112 at the same time. When the gate of the NMOS transistor T2 receives a high-level signal from either of them, it will control the NMOS transistor T2 to conduct, thereby controlling the conduction of the path between the functional module 101 and the ground terminal, and thus controlling the functional module 101 to perform a shutdown operation. For the gate of the NMOS transistor T2, under normal circumstances, it will not receive the signal from the first sub-control module 112, but only receive the control signal from the control terminal 142, and control whether the functional module 101 performs a shutdown operation according to the signal provided by the control terminal 142. When an abnormal power failure occurs, the NMOS transistor T2 will receive the signal from the first sub-control module 112. At this time, no matter what control signal is provided by the control terminal 142, it will control the NMOS transistor T2 to conduct, thereby controlling the conduction of the electrical connection path between the functional module 101 and the ground terminal, and thus controlling the functional module 101 to perform a shutdown operation.

[0055] Further, the gate of NMOS transistor T2 is electrically connected to the drain of PMOS transistor T1. Generally speaking, the gate of PMOS transistor T1 is electrically connected to power supply module 100, the source of PMOS transistor T1 is electrically connected to power supply module 100, the drain of PMOS transistor T1 is electrically connected to the gate of NMOS transistor T2, the gate of NMOS transistor T2 is also electrically connected to control terminal 142, the drain of NMOS transistor T2 is electrically connected to functional module 101, and the source of NMOS transistor T2 is electrically connected to the ground terminal. Thus, when power supply module 100 is in a normal state, both the gate and the source of PMOS transistor T1 receive high level, PMOS transistor T1 is not turned on, PMOS transistor T1 does not provide a signal to NMOS transistor T2, and NMOS transistor T2 is completely controlled by control terminal 142 to be turned on and off. Therefore, in the normal state, it is controlled by control terminal 142 whether functional module 101 performs a shutdown operation; when there is a sudden abnormal power failure, at this time, since power supply module 100 includes at least one capacitor, therefore, power supply module 100 does not stop supplying power. For PMOS transistor T1, due to the abnormal power failure, the gate of PMOS transistor T1 receives low level, PMOS transistor T1 is turned on, power supply module 100 provides a high level signal to the gate of NMOS transistor T2, NMOS transistor T2 receives the high level signal and is turned on, functional module 101 is turned on to the ground terminal, and a normal shutdown operation is performed, thereby avoiding sudden abnormal shutdown of functional module 101 and avoiding damage to functional module 101.

[0056] In some embodiments, control terminal 142 also receives the power supply of power supply module 100, so that in the normal state, control terminal 142 can normally perform a shutdown operation. When power supply module 100 suddenly loses power, control terminal 142 can no longer normally output a shutdown instruction. At this time, the power supply is provided by capacitor C1 and transmitted to second sub-control module 122 via first sub-control module 112, and then the conduction between the ground terminal and functional module 101 is controlled.

[0057] In some embodiments, second sub-control module 122 further includes: fourth resistor R4. One end of fourth resistor R4 is electrically connected to the gate of NMOS transistor T2, and the other end is electrically connected to the ground terminal. Fourth resistor R4 can be used as a pull-down resistor, so as to ensure that in the normal state, the gate of NMOS transistor T2 receives a low level signal, thereby avoiding the situation of erroneously shutting down functional module 101.

[0058] In some embodiments, the resistance value of fourth resistor R4 can be a resistor of 50 to 200 kΩ, so that fourth resistor R4 has a better pull-down effect.

[0059] In some embodiments, the second sub-control module 122 further includes: a fifth resistor R5. One end of the fifth resistor R5 is electrically connected to the control terminal 142, and the other end is electrically connected to the gate of the NMOS transistor T2. By setting the fifth resistor R5, the current signal output from the control terminal 142 to the NMOS transistor T2 can be restricted, thereby preventing the current transmitted from the control terminal 142 to the NMOS transistor T2 from being too large.

[0060] In some embodiments, the resistance value of the fifth resistor R5 can be 5 to 20 kiloohms. By setting the resistance of the fifth resistor R5 to 5 to 20 kiloohms, the effect of the fifth resistor R5 in controlling the current can be ensured.

[0061] In the embodiments of the present disclosure, the functional module 101 is also the part that realizes the functions in the protection circuit, and the power supply module 100 is also the part that provides the power supply. By setting the control module 102 to be electrically connected to the capacitor of the power supply module 100, for the capacitor, due to the characteristics of the capacitor, when the power supply module 100 suddenly loses power, it will release the stored charge after power-off. When the power is off, on the one hand, the control module 102 receives the power supply from the capacitor C1 to maintain the normal working state, and on the other hand, it waits to receive the shutdown signal. When the path between the functional module 101 and the ground terminal is conducted, the functional module 101 will execute the correct shutdown process, thereby achieving the purpose of protecting the functional module 101.

[0062] Those of ordinary skill in the art can understand that the above-described embodiments are specific embodiments for implementing the present disclosure. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be determined by the scope defined by the claims.

Claims

1. A protection circuit, characterized in that: include: A power module, wherein the power module includes at least one capacitor; a functional module, the functional module being electrically connected to the power module, the power module being used to supply power to the functional module; A control module is electrically connected to the capacitor of the power module, and the control module is electrically connected between the functional module and the ground terminal to control the conduction and disconnection between the ground terminal and the functional module.

2. The protection circuit according to claim 1, characterized in that: The control module comprises: a first sub-control module, the first sub-control module being electrically connected to the power module; The second sub-control module is electrically connected to the first sub-control module, and the second sub-control module is electrically connected between the functional module and the ground terminal, and receives the signal of the first sub-control module to control the conduction and disconnection between the ground terminal and the control module.

3. The protection circuit according to claim 2, characterized in that: The first sub-control module includes: A PMOS tube, a gate of the PMOS tube is electrically connected to the power module, a source of the PMOS tube is electrically connected to the capacitor, and a drain of the PMOS tube is electrically connected to the second sub-control module.

4. The protection circuit according to claim 3, characterized in that: The first sub-control module further includes: A first resistor, one end of the first resistor is electrically connected to the power module, and the other end of the first resistor is electrically connected to the ground.

5. The protection circuit according to claim 3 or 4, characterized in that: The first sub-control module further includes: A second resistor, one end of the second resistor is electrically connected to the drain of the PMOS tube, and the other end of the second resistor is electrically connected to the second sub-control module.

6. The protection circuit according to claim 5, characterized in that: The first sub-control module further includes: A third resistor, one end of the third resistor is electrically connected to the power module, and the other end of the third resistor is electrically connected to the gate of the PMOS tube.

7. The protection circuit according to claim 6, characterized in that: The resistance value of the second resistor is equal to the resistance value of the third resistor.

8. The protection circuit according to claim 3, characterized in that: The second sub-control module includes: Control terminal; An NMOS tube, wherein the gate of the NMOS tube is electrically connected to the control end, the gate of the NMOS tube is electrically connected to the drain of the PMOS tube, the drain of the NMOS tube is electrically connected to the functional module, the source of the NMOS tube is electrically connected to the ground end, and the NMOS tube receives signals from the control end and the first sub-control module to control conduction and disconnection between the ground end and the control module.

9. The protection circuit according to claim 8, characterized in that: The second sub-control module further includes: A fourth resistor, one end of the fourth resistor is electrically connected to the gate of the NMOS tube, and the other end of the fourth resistor is electrically connected to the ground terminal.

10. The protection circuit according to claim 8 or 9, characterized in that: The second sub-control module further includes: A fifth resistor, one end of the fifth resistor is electrically connected to the control end, and the other end of the fifth resistor is electrically connected to the gate of the NMOS tube.

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