CN220585984U - Protection circuit, circuit board and electronic equipment - Google Patents
Protection circuit, circuit board and electronic equipment Download PDFInfo
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- CN220585984U CN220585984U CN202322072915.0U CN202322072915U CN220585984U CN 220585984 U CN220585984 U CN 220585984U CN 202322072915 U CN202322072915 U CN 202322072915U CN 220585984 U CN220585984 U CN 220585984U
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Abstract
The embodiment of the application provides a protection circuit, a circuit board and electronic equipment, and belongs to the technical field of electronic circuits. Wherein, the protection circuit includes: any one or more of a reverse connection protection sub-circuit, an overvoltage protection sub-circuit, an undervoltage protection sub-circuit and an overcurrent protection sub-circuit, and a first electronic switch; the first end of any one of the protection sub-circuits is connected with the first electrode of the first electronic switch, and the second end of any one of the protection sub-circuits is connected with the control electrode of the first electronic switch; the first pole of the first electronic switch is also connected with the voltage input end of the protection circuit, and the second pole of the first electronic switch is connected with the voltage output end of the protection circuit. By adopting the method and the device, the protection subcircuit can be selected according to the application scene, and the whole protection circuit does not need to be redesigned when the application scene changes, so that time and labor are saved.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and more particularly, to a protection circuit, a circuit board, and an electronic device.
Background
Some unstable factors exist in the power supply circuit inevitably, so that the conditions of over-high or over-low power supply voltage, over-high circuit current and the like occur, and the normal operation of the circuit is seriously influenced. In order to ensure that the power supply system can operate safely and reliably, a corresponding protection circuit can be provided in the power supply circuit. When the conditions of over high or low power supply voltage, over high circuit current and the like occur, the power supply can be cut off in time through the protection circuit, and the power supply to the load is stopped.
The existing protection circuit is usually an integral body, and the functional modules are mutually dependent. When the application scenarios are different, the protection functions that need to be deployed in the protection circuit may be different. If a certain protection function is required to be added or reduced in the existing protection circuit, the whole protection circuit needs to be redesigned, and time and labor are wasted; otherwise, other protection functions originally in the protection circuit may not be realized. That is, the existing protection circuit cannot select the functional module according to the application scenario.
Disclosure of Invention
The embodiment of the application provides a protection circuit, a circuit board and electronic equipment, which can solve the technical problem that the existing protection circuit cannot select a functional module according to an application scene. In order to achieve the above object, the technical solution provided in the embodiments of the present application is as follows:
in a first aspect, embodiments of the present application provide a protection circuit, including: any one or more of a reverse connection protection sub-circuit, an overvoltage protection sub-circuit, an undervoltage protection sub-circuit and an overcurrent protection sub-circuit, and a first electronic switch;
a first end of any one of the protection sub-circuits is connected with a first pole of the first electronic switch, and a second end of any one of the protection sub-circuits is connected with a control pole of the first electronic switch;
the first pole of the first electronic switch is connected with the voltage input end of the protection circuit, and the second pole of the first electronic switch is connected with the voltage output end of the protection circuit.
In a second aspect, embodiments of the present application provide a circuit board, which includes the protection circuit according to the first aspect.
In a third aspect, an embodiment of the present application provides an electronic device, including the protection circuit according to the first aspect, and a circuit load connected to a voltage output terminal of the protection circuit.
In this embodiment of the present application, the reverse connection protection sub-circuit, the overvoltage protection sub-circuit, the undervoltage protection sub-circuit, and the overcurrent protection sub-circuit are independent of each other, and any one or more of them may be selected according to an application scenario, that is, the protection circuit may include all or part of the protection sub-circuits described above. Because any protection sub-circuit can control whether the voltage output end outputs voltage or not, corresponding protection functions can be realized independently. Therefore, the whole protection circuit does not need to be redesigned when the application scene changes, and time and labor are saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a specific structure of a protection circuit according to an embodiment of the present application;
FIG. 2 is a schematic block diagram of a protection circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic block diagram of another protection circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a reverse connection protection sub-circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram showing a specific structure of an overvoltage protection sub-circuit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a specific structure of an under-voltage protection sub-circuit according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an embodiment of an over-current protection sub-circuit according to the present disclosure;
FIG. 8 is a schematic block diagram of another protection circuit according to an embodiment of the present application;
FIG. 9 is a schematic diagram of another embodiment of a protection circuit according to the present disclosure;
fig. 10 is a schematic structural diagram of a circuit board according to an embodiment of the present utility model;
fig. 11 is a schematic structural diagram of an electronic device according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the following detailed description of the embodiments of the present utility model will be given with reference to the accompanying drawings.
It should be understood that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without making any inventive effort, are intended to be within the scope of the present application.
When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
In the description of this application, it should be understood that the terms "first," "second," "third," and the like are used merely to distinguish between similar objects and are not necessarily used to describe a particular order or sequence, nor should they be construed to indicate or imply relative importance. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Referring to fig. 1, a protection circuit provided in the present application may implement both a reverse connection protection function and an overvoltage protection function, including: the DC voltage input terminal VCC_IN, the DC voltage output terminal VCC_OUT, the ground terminal GND, the protection section PGND, the unidirectional diode D101, the dropping resistors R101, R102, R104, R105 and R107, the protection resistors R103 and R106, the PMOS transistor (positive channel Metal Oxide Semiconductor, P-type field effect transistor) Q101, the triode Q102, the NMOS transistor (N-Metal-Oxide-Semiconductor) Q103, the capacitors C101 and C102, the TVS transistor (Transient Voltage Suppressor, transient diode) Z101.
The specific working principle of the reverse connection protection function is as follows: when the MOS transistor Q103 is reversely connected, the G electrode (Gate) of the MOS transistor Q103 is at 0 potential, and the NMOS transistor Q103 is not conducted, so that the reverse connection preventing function is realized.
The specific working principle of the overvoltage protection function is as follows: when the battery connected to the voltage input end VCC_IN is over-voltage, the TVS tube Z101 is turned on, the triode Q102 is turned on, so that the voltage difference between the G pole and the S pole (Source) of the PMOS tube Q101 is reduced, the PMOS tube Q101 is turned off, and no output is generated at the later stage, namely, the voltage output end VCC_OUT is not generated.
When changing an application scenario, for example, changing a power supply from direct current to battery, IN the protection circuit provided IN fig. 1, the voltage input end vcc_in may be too low, i.e. an under-voltage condition occurs, and the battery will discharge all the time at this time, so that the service life of the battery is reduced, i.e. the under-voltage protection function cannot be realized.
When the power of the load terminal connected to the voltage output terminal vcc_out is too high or short-circuited, the line current will be significantly increased, and the protection circuit provided in fig. 1 cannot play a role in protection, i.e. cannot realize an overcurrent protection function.
Although the protection circuit provided in fig. 1 can realize the overvoltage protection function, when the power supply voltage is too large, one TVS tube bears all power stress, the heating is serious, and even the TVS tube is overheated and burnt out, so that the protection circuit loses the overvoltage protection function.
It should be noted that the circuit configuration shown in fig. 1 is obtained by the inventor of the present application during the development of the protection circuit, and is not a circuit configuration previously known to the public at home and abroad.
Based on this, the application also provides a novel protection circuit, which comprises an alternative reverse connection protection sub-circuit, an overvoltage protection sub-circuit, an undervoltage protection sub-circuit and an overcurrent protection sub-circuit. Therefore, the corresponding protection subcircuit can be selectively deployed according to the protection function required by each application scene, and the whole protection circuit does not need to be redesigned when the application scene changes, so that time and labor are saved.
Fig. 2 is a schematic block diagram of a protection circuit according to an embodiment of the present application. Referring to fig. 2, the protection circuit may include both a reverse connection protection sub-circuit 100, an overvoltage protection sub-circuit 200, an undervoltage protection sub-circuit 300, an overcurrent protection sub-circuit 400, and a first electronic switch. Each protection sub-circuit is independent of the other, and any protection sub-circuit can be connected with the first pole and the control pole of the first electronic switch. For example, a first terminal of the reverse connection protection sub-circuit 100 is connected to a first pole of the first electronic switch, and a second terminal of the reverse connection protection sub-circuit 100 is connected to a control pole of the first electronic switch. The first pole of the first electronic switch is also connected to the voltage input terminal vcc_in of the protection circuit, and the second pole of the first electronic switch is connected to the voltage output terminal vcc_out of the protection circuit. Based on the connection relation, each protection sub-circuit can independently control the on-off of the first electronic switch, so as to control whether the voltage output end connected to the first electronic switch outputs voltage. The first electronic switch may be a PMOS transistor.
In addition, in some application scenarios, only part of functions of reverse connection protection function, overvoltage protection function, undervoltage protection function and overcurrent protection function need to be realized. Therefore, in another embodiment, the protection circuit may select a protection sub-circuit with a required protection function from the plurality of protection sub-circuits according to different requirements of application scenarios. In other words, according to the actual requirements of the application scenario, the protection circuit may include any one or more of a reverse connection protection sub-circuit, an overvoltage protection sub-circuit, an undervoltage protection sub-circuit, and an overcurrent protection sub-circuit. For example, the protection circuit provided by the embodiment shown in fig. 3 includes only the reverse connection protection sub-circuit 100, the overvoltage protection sub-circuit 200, and the undervoltage protection sub-circuit 300, and does not include the overcurrent protection sub-circuit 400.
In one embodiment, referring to fig. 4, the reverse connection protection sub-circuit 100 may specifically include: the fifth electronic switch Q5, the first resistor R1, the sixth resistor R6 and the second voltage stabilizing tube Z2.
The control electrode of the fifth electronic switch Q5 is connected with the voltage input end vcc_in through the first resistor, the first electrode S of the fifth electronic switch Q5 is connected with the voltage output end vcc_out, and the second electrode D of the fifth electronic switch Q5 is grounded; the anode (i.e. the end where the triangle is located in the illustration) of the second voltage stabilizing tube Z2 is connected to the first pole of the fifth electronic switch Q5, and the cathode of the second voltage stabilizing tube is connected to the control pole of the fifth electronic switch Q5; the sixth resistor is connected in parallel with the second voltage stabilizing tube.
The fifth electronic switch Q5 may be an NMOS transistor, and accordingly, the first electrode of the fifth electronic switch Q5 is the source S, the second electrode of the fifth electronic switch Q5 is the drain D, and the control electrode of the fifth electronic switch Q5 is the gate G.
In this embodiment, the working principle of the reverse connection protection function implemented by the reverse connection protection sub-circuit is as follows: when the voltage input terminal vcc_in and the ground terminal GND are connected to the power supply IN opposite directions, the GND terminal is positive voltage, the voltage input terminal vcc_in is zero voltage, and the base B of the fifth electronic switch Q5 is connected to the vcc_in side, so that the base B of the fifth electronic switch Q5 is at 0 potential. At this time, the fifth electronic switch Q5 is not turned on, and the post-stage voltage output terminal vcc_out is not outputted.
In implementation, the reverse connection protection sub-circuit can use MOS transistors to prevent damage to the circuit caused by reverse connection of the power supply. Because the internal resistance of the MOS tube is very small and can be almost ignored, compared with the MOS tube adopting a diode, the MOS tube can avoid the problems of voltage drop and overlarge circuit loss.
In one embodiment, referring to fig. 5, the overvoltage protection subcircuit 200 may specifically include: the second resistor R2, the fifth resistor R5, the third voltage stabilizing tube Z3 and the second electronic switch Q2.
The second resistor R2 is connected with the third voltage stabilizing tube Z3 IN series, and the first end of the second resistor R2 is connected with the voltage input end VCC_IN; the control electrode of the second electronic switch Q2 is connected between the second resistor R2 and the third voltage stabilizing tube Z3 through a fifth resistor, the first electrode of the second electronic switch Q2 is connected with the voltage input end vcc_in, and the second electrode of the second electronic switch Q2 is connected with the control electrode of the first electronic switch Q1.
The second electronic switch Q2 may be a transistor (for example, a PNP transistor), and accordingly, the first electrode of the second electronic switch Q2 is an emitter E, the second electrode of the second electronic switch Q2 is a collector C, and the control electrode of the second electronic switch Q2 is a base B.
In this embodiment, the working principle of the overvoltage protection function implemented by the overvoltage protection sub-circuit is as follows: the overvoltage protection voltage point of the protection circuit is the clamping voltage value of the third voltage stabilizing tube Z3. When the input voltage of the voltage input terminal vcc_in is greater than the clamping voltage point of the third voltage regulator Z3, the third voltage regulator Z3 is turned on, and thus the voltage of the emitter E of the second electronic switch Q2 is higher than the voltage of the base B, and the second electronic switch Q2 is also turned on. At this time, the voltage drop of the gate G and the source S of the first electronic switch Q1 is the conduction voltage drop of the second electronic switch Q2. Since the second electronic switch Q2 is turned on, the source S and the gate G of the first electronic switch Q1 are short-circuited, and the source S and the gate G have the same voltage, and the first electronic switch Q1 is turned off, i.e., the source S and the drain D of the first electronic switch Q1 are turned off. Further, the post-stage voltage output terminal vcc_out is not output.
In one embodiment, referring to fig. 6, the under-voltage protection sub-circuit 300 may specifically include: the fourth resistor R4, the eighth resistor R8, the first voltage stabilizing tube Z1, the fourth voltage stabilizing tube Z4, the third electronic switch Q3 and the fourth electronic switch Q4.
The fourth resistor R4, the first voltage stabilizing tube Z1 and the fourth voltage stabilizing tube Z4 are sequentially connected IN series, and the first end of the fourth resistor R4 is connected with the voltage input end VCC_IN; the control electrode of the third electronic switch Q3 is connected between the first voltage stabilizing tube Z1 and the fourth voltage stabilizing tube Z4 through an eighth resistor R8, the first electrode E of the third electronic switch Q3 is connected with the anode of the fourth voltage stabilizing tube Z4, and the second electrode of the third electronic switch Q3 is connected with the voltage input end VCC_IN; the control electrode of the fourth electronic switch Q4 is connected to the second electrode of the third electronic switch Q3, the first electrode E of the fourth electronic switch Q4 is connected to the control electrode of the first electronic switch Q1, and the second electrode of the fourth electronic switch Q4 is connected to the voltage input terminal vcc_in.
The third electronic switch Q3 and the fourth electronic switch Q4 may be a transistor (for example, NPN transistor), and correspondingly, the first electrode of the third electronic switch Q3 is an emitter E, the second electrode of the third electronic switch Q3 is a collector C, and the control electrode of the third electronic switch Q3 is a base B; the first electrode of the fourth electronic switch Q4 is the emitter E, the second electrode of the fourth electronic switch Q4 is the collector C, and the control electrode of the fourth electronic switch Q4 is the base B.
In this embodiment, the operating principle of the undervoltage protection function implemented by the undervoltage protection sub-circuit is: the under-voltage protection voltage point of the protection circuit is a voltage clamp point of a first voltage stabilizing tube Z1+a fourth voltage stabilizing tube Z4, and when the input voltage of a voltage input end VCC_IN is smaller than the clamping voltage point of Z1+Z4, Z1 and Z4 are IN an cut-off state. Thus, by the serial connection of the two voltage stabilizing tubes, the node between the Z1 and the Z4 is not conducted with the voltage input end VCC_IN, and is not conducted with the ground line, so that the voltage between the Z1 and the Z4 is 0, namely the voltage of the base B of the third electronic switch Q3 is 0, and the third electronic switch Q3 is not conducted. At this time, the voltage of the base B of the fourth electronic switch Q4 is greater than the voltage of the emitter E, and the fourth electronic switch Q4 is turned on. Since the fourth electronic switch Q4 is turned on, the source S and the gate G of the first electronic switch Q1 are short-circuited, and the source S and the gate G have the same voltage, and the first electronic switch Q1 is turned off, i.e., the source S and the drain D of the first electronic switch Q1 are turned off. Further, the post-stage voltage output terminal vcc_out is not output.
It should be noted that, in the present embodiment, if the under-voltage protection sub-circuit only adopts one electronic switch, namely only adopts the third electronic switch Q3, when the input voltage is too low, whether Q3 is turned on has no influence on the on-off state of Q1, and thus under-voltage cannot be realizedAnd (5) a pressure protection function. Because the source S of the first electronic switch Q1 is connected to the voltage input terminal VCC_IN, the source S thereof is at the voltage U S Equal to the input voltage U IN . The G pole of the first electronic switch Q1 is connected with other components in the circuit, and the G pole voltage U G Will be smaller than the input voltage value U IN U of Q1 G <U S The first electronic switch Q1 is turned on, and the post-stage voltage output terminal vcc_out keeps outputting. Based on this, the fourth electronic switch Q4 is added to the circuit, and when the third electronic switch Q3 is turned off, the fourth electronic switch Q4 is turned on instead, so that the G-pole voltage and the S-pole voltage of the first electronic switch Q1 are equal, and the first electronic switch Q1 is turned off. In this way, by means of the cooperation of the two electronic switches, the control voltage output vcc_out can no longer output a voltage to the load when the input voltage is too low.
In one embodiment, referring to fig. 7, the over-current protection sub-circuit 400 may specifically include: a fifth electronic switch Q5, a sixth electronic switch Q6, an operational amplifier U1A, a third resistor R3, an eleventh resistor R11, and a twelfth resistor R12.
The non-inverting terminal 3 of the operational amplifier is connected with the first pole S of the fifth electronic switch Q5, the inverting terminal 2 of the operational amplifier is grounded through an eleventh resistor, and the output terminal 1 of the operational amplifier U1A is connected with the inverting terminal 2 of the operational amplifier through a twelfth resistor R12; the control electrode of the sixth electronic switch Q6 is connected to the output terminal 1 of the operational amplifier U1A through the third resistor R3, the first electrode E of the sixth electronic switch Q6 is connected to the control electrode of the first electronic switch Q1, and the second electrode C of the sixth electronic switch Q6 is connected to the voltage input terminal vcc_in.
The sixth electronic switch Q6 may be a transistor (for example, an NPN transistor), and accordingly, the first electrode of the sixth electronic switch Q6 is the emitter E, the second electrode of the sixth electronic switch Q6 is the collector C, and the control electrode of the sixth electronic switch Q6 is the base B.
In this embodiment, the working principle of the overcurrent protection function implemented by the overcurrent protection sub-circuit is as follows: the operational amplifier samples the source voltage of the fifth electronic switch Q5, amplifies the source voltage in phase, and outputs the source voltage to the base electrode of the sixth electronic switch Q6, and the equivalent internal resistance Rdson of the fifth electronic switch Q5, namely the conduction internal resistance in the MOS tube, is of a fixed size. When the current flowing through the fifth electronic switch Q5 is large, the voltage V3 at the source of the fifth electronic switch Q5 is also increased, and the voltage V1 output through the operational amplifier turns on the sixth electronic switch Q6. Since the sixth electronic switch Q6 is turned on, the source S and the gate G of the first electronic switch Q1 are short-circuited, and the source S and the gate G have the same voltage, and the first electronic switch Q1 is turned off, i.e., the source S and the drain D of the first electronic switch Q1 are turned off. Further, the post-stage voltage output terminal vcc_out is not output.
It is worth mentioning that according to the principle of the virtual short and virtual break of the operational amplifier, the amplification factor is as follows:
V2＝V3,
the current output by the amplifier is:
I 1 ＝V 1 /(R 12 +R 11 )
V 1 /V 3 ＝(R 12 +R 11 )/R 11
namely, the amplification factor is as follows:
V 1 /V 3 ＝1+(R 12 /R 11 )
based on the amplification, when overcurrent occurs, the voltage of the base B of the sixth electronic switch Q6 may be greater than the voltage of the emitter E, the sixth electronic switch Q6 is turned on, and the post-stage voltage output terminal vcc_out is not output.
IN another embodiment, referring to fig. 8, the first end of the over-current protection sub-circuit 400 may be connected to the voltage input terminal vcc_in through the reverse connection protection sub-circuit 100, and the over-current protection sub-circuit 400 may share some or all of the components IN the reverse connection protection sub-circuit 100.
In implementation, referring to fig. 9, when the protection circuit includes both the reverse connection protection sub-circuit and the over-current protection sub-circuit, the fifth electronic switch Q5 may be shared by the over-current protection sub-circuit 400 and the reverse connection protection sub-circuit 100. The overcurrent protection sub-circuit and the reverse connection protection sub-circuit may share a bias resistor R1 connected to the gate G of the fifth electronic switch Q5.
In implementation, the in-phase end of the operational amplifier needs to be connected with a sampling resistor, and in the overcurrent protection circuit 400 of the application, the operational amplifier can adopt the internal resistance of the MOS tube as the sampling resistor thereof, so that the sampling resistor does not need to be additionally arranged, and the cost can be saved.
Based on the same inventive concept, the present application also provides a circuit board, see fig. 10, which includes the protection circuit described above. The circuit board can be single or spliced by a plurality of circuit sub-boards. In other words, the protection circuit may be integrally disposed on one circuit board, or may be divided into a plurality of parts and then separately disposed on different circuit sub-boards. For example, the overvoltage protection sub-circuit, the undervoltage protection sub-circuit, the overcurrent protection sub-circuit and the reverse connection protection sub-circuit can be respectively arranged on different circuit sub-boards, and when partial or all protection functions are needed to be realized, a user can splice corresponding partial or all circuit sub-boards into a circuit board with the needed protection functions. The specific technical scheme and technical effect may refer to the above description of the protection circuit, and will not be repeated here.
Of course, any sub-circuit may be divided into a plurality of parts and respectively arranged on different circuit sub-boards. For example, the overvoltage protection subcircuit may be divided into multiple sections, with each section being disposed on a different circuit daughter board. When in use, a user can splice all circuit sub-boards of the overvoltage protection sub-circuit into a circuit board with an overvoltage protection function.
Based on the same inventive concept, the present application further provides an electronic device, which may refer to fig. 11, and the electronic device includes the protection circuit provided by any one of the embodiments and a circuit load connected to a voltage output terminal of the protection circuit. The specific technical scheme and technical effect may refer to the above description of the protection circuit, and the description is omitted herein.
The foregoing description of the preferred embodiments of the present application is not intended to limit the utility model to the particular embodiments of the present application, but to limit the scope of the utility model to the particular embodiments of the present application.
Claims (10)
1. A protection circuit, the protection circuit comprising: any one or more of a reverse connection protection sub-circuit, an overvoltage protection sub-circuit, an undervoltage protection sub-circuit and an overcurrent protection sub-circuit, and a first electronic switch;
a first end of any one of the protection sub-circuits is connected with a first pole of the first electronic switch, and a second end of any one of the protection sub-circuits is connected with a control pole of the first electronic switch;
the first pole of the first electronic switch is also connected with the voltage input end of the protection circuit, and the second pole of the first electronic switch is connected with the voltage output end of the protection circuit.
2. The protection circuit of claim 1, wherein the reverse protection sub-circuit comprises a fifth electronic switch, a first resistor, a sixth resistor, and a second voltage regulator tube;
the control electrode of the fifth electronic switch is connected with the voltage input end through the first resistor, the first electrode of the fifth electronic switch is connected with the voltage output end, and the second electrode of the fifth electronic switch is grounded;
the anode of the second voltage stabilizing tube is connected with the first pole of the fifth electronic switch, and the cathode of the second voltage stabilizing tube is connected with the control pole of the fifth electronic switch;
the sixth resistor is connected with the second voltage stabilizing tube in parallel.
3. The protection circuit of claim 1, wherein the overvoltage protection subcircuit comprises: the second resistor, the fifth resistor, the third voltage stabilizing tube and the second electronic switch;
the second resistor is connected with the third voltage stabilizing tube in series, and the first end of the second resistor is connected with the voltage input end;
the control electrode of the second electronic switch is connected between the second resistor and the third voltage stabilizing tube through the fifth resistor, the first electrode of the second electronic switch is connected with the voltage input end, and the second electrode of the second electronic switch is connected with the control electrode of the first electronic switch.
4. The protection circuit of claim 1, wherein the under-voltage protection sub-circuit comprises: the fourth resistor, the eighth resistor, the first voltage stabilizing tube, the fourth voltage stabilizing tube, the third electronic switch and the fourth electronic switch;
the fourth resistor, the first voltage stabilizing tube and the fourth voltage stabilizing tube are sequentially connected in series, and the first end of the fourth resistor is connected with the voltage input end;
the control electrode of the third electronic switch is connected between the first voltage stabilizing tube and the fourth voltage stabilizing tube through the eighth resistor, the first electrode of the third electronic switch is connected with the anode of the fourth voltage stabilizing tube, and the second electrode of the third electronic switch is connected with the voltage input end;
the control electrode of the fourth electronic switch is connected with the second electrode of the third electronic switch, the first electrode of the fourth electronic switch is connected with the control electrode of the first electronic switch, and the second electrode of the fourth electronic switch is connected with the voltage input end.
5. The protection circuit of claim 1, wherein the over-current protection subcircuit comprises: a fifth electronic switch, a sixth electronic switch, an operational amplifier, a third resistor, an eleventh resistor, and a twelfth resistor;
the non-inverting terminal of the operational amplifier is connected with the first pole of the fifth electronic switch, the inverting terminal of the operational amplifier is grounded through the eleventh resistor, and the output terminal of the operational amplifier is connected with the inverting terminal of the operational amplifier through the twelfth resistor;
the control electrode of the sixth electronic switch is connected with the output end of the operational amplifier through a third resistor, the first electrode of the sixth electronic switch is connected with the control electrode of the first electronic switch, and the second electrode of the sixth electronic switch is connected with the voltage input end.
6. The protection circuit of claim 2 or 5, wherein the protection circuit and the reverse protection subcircuit share the fifth electronic switch when the protection circuit includes both the reverse protection subcircuit and the reverse protection subcircuit.
7. The protection circuit of claim 2 or 5, wherein the fifth electronic switch is an NMOS transistor.
8. The protection circuit of claim 1, wherein the first electronic switch is a PMOS transistor.
9. A circuit board comprising the protection circuit according to any one of claims 1 to 8.
10. An electronic device comprising a protection circuit as claimed in any one of claims 1-8, and a circuit load connected to a voltage output of the protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322072915.0U CN220585984U (en) | 2023-08-02 | 2023-08-02 | Protection circuit, circuit board and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322072915.0U CN220585984U (en) | 2023-08-02 | 2023-08-02 | Protection circuit, circuit board and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220585984U true CN220585984U (en) | 2024-03-12 |
Family
ID=90116359
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322072915.0U Active CN220585984U (en) | 2023-08-02 | 2023-08-02 | Protection circuit, circuit board and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN220585984U (en) |
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2023
- 2023-08-02 CN CN202322072915.0U patent/CN220585984U/en active Active
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