CN219145016U - Protection circuit, chip and electronic equipment - Google Patents
Protection circuit, chip and electronic equipment Download PDFInfo
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- CN219145016U CN219145016U CN202223241401.5U CN202223241401U CN219145016U CN 219145016 U CN219145016 U CN 219145016U CN 202223241401 U CN202223241401 U CN 202223241401U CN 219145016 U CN219145016 U CN 219145016U
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Abstract
The application provides a protection circuit, a chip and electronic equipment, and belongs to the technical field of electronics. The protection circuit comprises a voltage comparison circuit, a first switch circuit and a second switch circuit, wherein the second switch circuit is used for enabling the first switch circuit to be turned off when the input voltage is higher than a threshold voltage; the first end of the voltage comparison circuit is connected with the input end of the protection circuit, and the second end of the voltage comparison circuit is connected with the first end of the second switch circuit; the first end of the first switch circuit is connected with the third end of the second switch circuit, the second end of the first switch circuit is connected with the input end of the protection circuit, and the third end of the first switch circuit is connected with the output end of the protection circuit; the second end of the second switch circuit is connected with the second end of the first switch circuit. By adopting the method and the device, overvoltage protection can be realized.
Description
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a protection circuit, a chip, and an electronic device.
Background
In electronic devices, it is often necessary to charge the electronic devices, and in the charging process, the voltage input to the electronic devices is too high due to temperature change, power grid fluctuation and other reasons, which may cause damage to the electronic devices due to the too high input voltage.
Therefore, a protection circuit is needed to protect the electronic device from overvoltage.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the application provides a protection circuit, a chip and electronic equipment. The technical proposal is as follows:
according to an aspect of the present application, there is provided a protection circuit including a voltage comparison circuit, a first switching circuit, a second switching circuit for turning off the first switching circuit when an input voltage is higher than a threshold voltage;
the first end of the voltage comparison circuit is connected with the input end of the protection circuit, and the second end of the voltage comparison circuit is connected with the first end of the second switch circuit;
the first end of the first switch circuit is connected with the third end of the second switch circuit, the second end of the first switch circuit is connected with the input end of the protection circuit, and the third end of the first switch circuit is connected with the output end of the protection circuit;
the second end of the second switch circuit is connected with the second end of the first switch circuit.
Optionally, the voltage comparison circuit includes a first resistor unit, a second resistor unit, and a comparator unit;
the first end of the first resistor unit is connected with the input end of the protection circuit, the second end of the first resistor unit is connected with the first end of the second resistor unit, and the second end of the second resistor unit is grounded;
the first end of the comparator unit is connected with the first end of the second switch circuit, the second end of the comparator unit is connected with the second end of the first resistor unit, and the third end of the comparator unit is grounded.
Optionally, the comparator unit includes a TL431 circuit;
the reference electrode of the TL431 circuit is connected with the second end of the first resistor unit, the cathode of the TL431 circuit is connected with the first end of the second switch circuit, and the anode of the TL431 circuit is grounded;
optionally, the first switching circuit includes a first transistor unit, a fifth resistor unit, and a sixth resistor unit;
the first pole of the first transistor unit is connected with the third end of the second switch circuit, the second pole of the first transistor unit is connected with the input end of the protection circuit, and the third pole of the first transistor unit is connected with the output end of the protection circuit;
a first end of the fifth resistor unit is connected with a first pole of the first transistor unit, and a second end of the fifth resistor unit is connected with a second pole of the first transistor unit;
the first end of the sixth resistor unit is connected with the first pole of the first transistor unit, and the second end of the sixth resistor unit is grounded.
Optionally, the first switch circuit further includes a first voltage stabilizing unit, a first end of the first voltage stabilizing unit is connected to the first pole of the first transistor unit, and a second end of the first voltage stabilizing unit is connected to the second pole of the first transistor unit.
Optionally, the first voltage stabilizing unit includes a voltage stabilizing diode.
Optionally, the first transistor unit includes a field effect transistor or a triode.
Optionally, the second switching circuit includes a switching unit, a third resistance unit and a fourth resistance unit;
the first end of the third resistor unit is the first end of the second switch circuit, the second end of the third resistor unit is connected with the first end of the fourth resistor unit, and the second end of the fourth resistor unit is connected with the input end of the protection circuit;
the first end of the fourth resistor unit is also connected with the first end of the switch unit.
Optionally, the switching unit includes a second transistor unit;
the first pole of the second transistor unit is connected with the first end of the fourth resistor unit, the second pole of the second transistor unit is connected with the input end of the protection circuit, and the third pole of the first transistor unit is connected with the first end of the first switch circuit.
Optionally, the second switching circuit further includes a second voltage stabilizing unit, a first end of the second voltage stabilizing unit is connected to the first pole of the second transistor unit, and a second end of the second voltage stabilizing unit is connected to the second pole of the second transistor unit.
Optionally, the second voltage stabilizing unit includes a voltage stabilizing diode.
Optionally, the second transistor unit includes a field effect transistor or a triode.
According to another aspect of the present application, there is provided a chip including the protection circuit described above.
According to another aspect of the present application, there is provided an electronic device including the protection circuit described above.
In the application, when the input voltage is not higher than the threshold voltage, the voltage comparison circuit can enable the second switching circuit to be turned off, the first switching circuit is turned on, and the output end of the protection circuit can output the voltage not higher than the threshold voltage to supply power to the later-stage circuit; when the input voltage is higher than the threshold voltage, the voltage comparison circuit can enable the second switching circuit to be conducted, the second switching circuit can enable the first switching circuit to be turned off, and the output end of the protection circuit does not output the voltage higher than the threshold voltage, so that overvoltage protection is achieved.
Drawings
Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments, with reference to the following drawings, wherein:
fig. 1 shows a schematic diagram of a protection circuit provided according to an exemplary embodiment of the present application;
FIG. 2 shows a schematic diagram of a voltage comparison circuit provided in accordance with an exemplary embodiment of the present application;
FIG. 3 shows a schematic diagram of a comparator unit provided in accordance with an exemplary embodiment of the present application;
FIG. 4 illustrates a first switching circuit schematic provided in accordance with an exemplary embodiment of the present application;
FIG. 5 illustrates a first switching circuit schematic provided in accordance with an exemplary embodiment of the present application;
fig. 6 shows a schematic diagram of a switching unit provided according to an exemplary embodiment of the present application;
FIG. 7 illustrates a second switching circuit schematic provided in accordance with an exemplary embodiment of the present application;
fig. 8 shows a schematic diagram of a protection circuit provided according to an exemplary embodiment of the present application.
In the drawing the view of the figure,
1. a voltage comparison circuit; 11. a comparator unit; 2. a first switching circuit; 21. a first transistor unit; 22. a first voltage stabilizing unit; 3. a second switching circuit; 31. a switching unit; 311. a second transistor unit; 32. and a second voltage stabilizing unit.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In order to better understand the solution of the present application, the following description will make clear and complete descriptions of the technical solution of the embodiment of the present application with reference to the accompanying drawings in the embodiment of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the embodiment of the application, at least one refers to one or more; plural means two or more. In the description of the present application, the words "first," "second," "third," and the like are used solely for the purpose of distinguishing between descriptions and not necessarily for the purpose of indicating or implying a relative importance or order.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, the terms "comprising," "including," "having," and variations thereof herein mean "including but not limited to," unless expressly specified otherwise.
It should be noted that, in the embodiment of the present application, "and/or" describe the association relationship of the association object, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone.
It should be noted that in the embodiments of the present application, "connected" is understood to mean electrically connected, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.
In order to more clearly describe the technical problem to be solved by the present application, two practical applications will be described below.
In some bluetooth circuits, an adapter may be used to power the bluetooth module based on the voltage provided by the power grid. When the power grid fluctuates, the voltage output by the adapter to the Bluetooth module also fluctuates correspondingly, and if the fluctuating voltage exceeds the working voltage of the Bluetooth module, a certain probability exists that the Bluetooth module is burnt.
In some fast charging circuits, when the battery is charged fast, if the voltage input to the battery is too high, the battery may bulge, and in severe cases, the battery may explode.
Of course, other circuits with overvoltage protection requirements exist in practical applications, and this embodiment is not listed one by one.
In order to realize overvoltage protection and reduce the probability of connecting an excessively high voltage to a later-stage circuit (such as the Bluetooth module or the battery), the embodiment of the application provides a protection circuit.
Referring to the protection circuit schematic shown in fig. 1, the protection circuit may include a voltage comparison circuit 1, a first switching circuit 2, and a second switching circuit 3 for turning off the first switching circuit 2 when an input voltage is higher than a threshold voltage.
The first end of the voltage comparison circuit 1 is connected with the input end of the protection circuit, and the second end of the voltage comparison circuit 1 is connected with the first end of the second switch circuit 3;
the first end of the first switch circuit 2 is connected with the third end of the second switch circuit 3, the second end of the first switch circuit 2 is connected with the input end of the protection circuit, and the third end of the first switch circuit 2 is connected with the output end of the protection circuit;
a second terminal of the second switching circuit 3 is connected to a second terminal of the first switching circuit 2.
The implementation principle can be as follows:
the voltage comparing circuit 1 may compare the input voltage received by the first terminal thereof with a threshold voltage, and the input voltage is also the input voltage of the protection circuit. When the input voltage is not higher than the threshold voltage, the voltage of the second terminal of the voltage comparison circuit 1 may be the first voltage. Thus, the first terminal of the second switching circuit 3 may receive the first voltage and be turned off by the first voltage and the input voltage. At this time, the first switching circuit 2 may be turned on, and voltages of a second terminal for connecting an input terminal of the protection circuit and a third terminal for connecting an output terminal of the protection circuit may be substantially equal or equal, so that the output terminal of the protection circuit may output a voltage not higher than a threshold voltage to supply power to the subsequent circuit.
When the input voltage is higher than the threshold voltage, the voltage of the second terminal of the voltage comparison circuit 1 may be the second voltage. Thus, the first terminal of the second switching circuit 3 may receive the second voltage and be turned on by the second voltage and the input voltage, and the voltages of the second terminal and the third terminal of the second switching circuit 3 may be substantially equal or equal, that is, the voltages of the first terminal and the second terminal of the first switching circuit 2 may be substantially equal or equal. On the basis of this, the first switching circuit 2 can be turned off, and the output terminal of the protection circuit does not output the voltage higher than the threshold voltage, thereby realizing overvoltage protection.
And if the input voltage falls below the threshold voltage after being higher than the threshold voltage, the protection circuit can also restore to the working state when the input voltage is not higher than the threshold voltage, output the voltage not higher than the threshold voltage, and continue to supply power to the subsequent circuit.
Alternatively, referring to the voltage comparison circuit schematic shown in fig. 2, the voltage comparison circuit 1 may include a first resistance unit R1, a second resistance unit R2, and a comparator unit 11.
The first end of the first resistor unit R1 is connected with the input end of the protection circuit, the second end of the first resistor unit R1 is connected with the first end of the second resistor unit R2, and the second end of the second resistor unit R2 is grounded;
the first end of the comparator unit 11 is connected to the first end of the second switching circuit 3, the second end of the comparator unit 11 is connected to the second end of the first resistor unit R1, and the third end of the comparator unit 11 is grounded.
The implementation principle can be as follows:
the first and second resistance units R1 and R2 may constitute a voltage feedforward circuit having a voltage at the second end of the first resistance unit R1 (or the first end of the second resistance unit R2) as a feedback voltage. When the input voltage increases, the feedback voltage correspondingly increases; when the input voltage decreases, the feedback voltage also decreases accordingly.
The second terminal of the comparator unit 11 may receive the feedback voltage. The comparator unit 11 may be preconfigured with a reference voltage (corresponding to the above threshold voltage), and may be configured to: when the feedback voltage is not higher than the reference voltage, the voltage at the first end (i.e., the second end of the voltage comparison circuit 1) may be the first voltage; when the feedback voltage is higher than the reference voltage, the second voltage is output at the first end (i.e., the second end of the voltage comparing circuit 1) thereof.
Alternatively, referring to the schematic diagram of the comparator unit shown in fig. 3, the comparator unit 11 may include a TL431 circuit, and the second switch circuit 3 includes a switch unit 31, a third resistor unit R3, and a fourth resistor unit R4.
The reference electrode of the TL431 circuit is connected with the second end of the first resistor unit R1, the cathode of the TL431 circuit is connected with the first end of the second switch circuit 3, and the anode of the TL431 circuit is grounded;
the first end of the third resistor unit R3 is the first end of the second switch circuit 3, the second end of the third resistor unit R3 is connected with the first end of the fourth resistor unit R4, and the second end of the fourth resistor unit R4 is connected with the input end of the protection circuit;
the first end of the fourth resistor unit R4 is also connected to the first end of the switch unit 31.
The implementation principle can be as follows:
the reference pole of the TL431 circuit may be used to receive the feedback voltage described above, with a reference voltage (e.g., 2.5V) configured therein. When the feedback voltage is not higher than the reference voltage, the TL431 circuit turns off, the current flowing through the third and fourth resistor units R3 and R4 is 0, and the voltage difference between the third and fourth resistor units R3 and R4 is 0. If the voltage at the second end of the fourth resistor unit R4 is equal to the input voltage, the voltage at the first end of the fourth resistor unit R3 is also equal to the input voltage (i.e., the first voltage). At this time, the voltage difference between the first end and the second end (both ends of the fourth resistor unit R4) of the switching unit 31 is 0, so that the switching unit 31 may be turned off.
When the feedback voltage is higher than the reference voltage, the TL431 circuit is turned on, and at this time, the voltage at the first end of the third resistor unit R3 is the second voltage obtained after the TL431 circuit is turned on, the voltage at the second end of the fourth resistor unit R4 is the input voltage, and the current flowing through the third resistor unit R3 and the fourth resistor unit R4 is not 0, so that a voltage difference is formed between the two ends of the fourth resistor unit R4. At this time, the voltage difference between the first and second terminals of the switching unit 31 is equal to the voltage difference between the two terminals of the fourth resistance unit R4, so that the switching unit 31 may be turned on, and the voltages of the second and third terminals of the switching unit 31 may be substantially equal or equal.
The TL431 circuit has the characteristics of flat temperature characteristic in the whole temperature range, typical value of 50 ppm/DEG C and stable reference voltage of +/-0.4%, and stable and accurate overvoltage protection function can be realized by adopting the TL431 circuit.
Alternatively, referring to the first switching circuit schematic shown in fig. 4, the first switching circuit 2 may include a first transistor unit 21, a fifth resistor unit R5, and a sixth resistor unit R6.
A first pole of the first transistor unit 21 is connected with a third terminal of the second switch circuit 3, a second pole of the first transistor unit 21 is connected with an input terminal of the protection circuit, and a third pole of the first transistor unit 21 is connected with an output terminal of the protection circuit;
a first end of the fifth resistance unit R5 is connected to the first pole of the first transistor unit 21, and a second end of the fifth resistance unit R5 is connected to the second pole of the first transistor unit 21;
a first end of the sixth resistor unit R6 is connected to the first pole of the first transistor unit 21, and a second end of the sixth resistor unit R6 is grounded.
The implementation principle can be as follows:
when the input voltage is not higher than the threshold voltage, the second switch circuit 3 is turned off, so that a voltage difference is formed between the two ends of the fifth resistor unit R5, that is, a voltage difference is formed between the first pole and the second pole of the first transistor unit 21, so that the first transistor unit 21 can be turned on, and the voltage at the input end of the protection circuit is transmitted to the output end through the first transistor unit 21.
When the input voltage is higher than the threshold voltage, the second switch circuit 3 is turned on, and the voltage difference between the two ends of the fifth resistor unit R5 is 0, that is, there is no voltage difference between the first pole and the second pole of the first transistor unit 21, so that the first transistor unit 21 can be turned off, thereby avoiding transmitting the voltage higher than the threshold voltage to the output terminal, and realizing overvoltage protection.
Alternatively, referring to the first switching circuit schematic shown in fig. 5, the first switching circuit 2 may further include a first voltage stabilizing unit 22, a first terminal of the first voltage stabilizing unit 22 is connected to a first pole of the first transistor unit 21, and a second terminal of the first voltage stabilizing unit 22 is connected to a second pole of the first transistor unit 21. Alternatively, the first voltage stabilizing unit 22 may include a zener diode. By providing the voltage stabilizing unit between the first pole and the second pole of the first transistor unit 21, the surge current and the surge current can be absorbed, the first transistor unit 21 is protected, and the reliability of the protection circuit is improved.
Alternatively, the first transistor unit 21 may include a field effect transistor or a triode. The field effect transistor has small conduction voltage difference and low power consumption, and the precision of the protection circuit can be improved by adopting the field effect transistor. The triode has low cost, and the cost of the protection circuit can be reduced by adopting the triode.
Of course, other devices having a switching function may be used for the first transistor unit 21, which is not limited in this embodiment.
Alternatively, referring to the schematic diagram of the switching unit shown in fig. 6, the switching unit 31 may include a second transistor unit 311.
A first pole of the second transistor unit 311 is connected to a first end of the fourth resistor unit R4, a second pole of the second transistor unit 311 is connected to an input terminal of the protection circuit, and a third pole of the second transistor unit 311 is connected to a first end of the first switching circuit 2.
The implementation principle can be as follows:
when the input voltage is not higher than the threshold voltage, the voltage at the second end of the voltage comparison circuit 1 is the first voltage, and at this time, the voltage difference between the first pole and the second pole of the second transistor unit 311 is 0, so that the second transistor unit 311 can be turned off. At this time, the first switching circuit 2 may be turned on, thereby transmitting the voltage of the input terminal of the protection circuit to the output terminal.
When the input voltage is higher than the threshold voltage, the voltage at the second end of the voltage comparison circuit 1 is the second voltage, and at this time, a voltage difference exists between the first pole and the second pole of the second transistor unit 311, so that the second transistor unit 311 can be turned on. At this time, the first switching circuit 2 may be turned off, thereby avoiding transmission of a voltage higher than the threshold voltage to the output terminal, and realizing overvoltage protection.
Alternatively, referring to the second switching circuit schematic shown in fig. 7, the second switching circuit 3 may further include a second voltage stabilizing unit 32, a first terminal of the second voltage stabilizing unit 32 is connected to the first pole of the second transistor unit 311, and a second terminal of the second voltage stabilizing unit 32 is connected to the second pole of the second transistor unit 311. Alternatively, the second voltage stabilizing unit 32 may include a zener diode. By providing the voltage stabilizing unit between the first pole and the second pole of the second transistor unit 311, the surge current and the surge current can be absorbed, the second transistor unit 311 is protected, and the reliability of the protection circuit is improved.
Alternatively, the second transistor unit 311 may include a field effect transistor or a triode. The field effect transistor has small conduction voltage difference and low power consumption, and the precision of the protection circuit can be improved by adopting the field effect transistor. The triode has low cost, and the cost of the protection circuit can be reduced by adopting the triode.
Of course, the second transistor unit 311 may also use other devices with a switching function, which is not limited in this embodiment.
As an example, fig. 8 shows a specific protection circuit in which the voltage comparison circuit 1 includes a first resistance unit R1, a second resistance unit R2, and a TL431 circuit; the first switch circuit 2 includes a fifth resistor unit R5, a sixth resistor unit R6, a triode Q1, and a zener diode D1; the second switching circuit 3 includes a third resistance unit R3, a fourth resistance unit R4, a transistor Q2, and a zener diode D2.
In the voltage comparison circuit 1, a first end of a first resistance unit R1 is connected with an input end of a protection circuit, a second end of the first resistance unit R1 is connected with a first end of a second resistance unit R2, and a second end of the second resistance unit R2 is grounded; the reference electrode of the TL431 circuit is connected with the second end of the first resistor unit R1, the cathode of the TL431 circuit is connected with the first end of the third resistor unit R3, and the anode of the TL431 circuit is grounded.
In the first switch circuit 2, a first pole of the triode Q1 is connected with a third pole of the triode Q2, a second pole of the triode Q1 is connected with an input end of the protection circuit, and a third pole of the triode Q1 is connected with an output end of the protection circuit; a first end of the fifth resistor unit R5 is connected with a first pole of the triode Q1, and a second end of the fifth resistor unit R5 is connected with a second pole of the triode Q1; a first end of the sixth resistance unit R6 is connected with the first pole of the triode Q1, and a second end of the sixth resistance unit R6 is grounded; the zener diode D1 is disposed between the first pole and the second pole of the transistor Q1.
In the second switch circuit 3, a first end of a third resistor unit R3 is connected with a cathode of the TL431 circuit, a second end of the third resistor unit R3 is connected with a first end of a fourth resistor unit R4, a second end of the fourth resistor unit R4 is connected with an input end of the protection circuit, and a first end of the fourth resistor unit R4 is also connected with a first pole of the triode Q2; the second pole of the triode Q2 is connected with the input end of the protection circuit, and the third pole of the triode Q2 is connected with the first pole of the triode Q1; the zener diode D2 is arranged between the first pole and the second pole of the transistor Q2.
The implementation principle of the protection circuit is the same as the above, and will not be repeated here.
The embodiment of the application can obtain the following beneficial effects:
(1) When the input voltage is not higher than the threshold voltage, the voltage comparison circuit can enable the second switching circuit to be turned off, the first switching circuit is turned on, and the output end of the protection circuit can output the voltage not higher than the threshold voltage to supply power to the later-stage circuit; when the input voltage is higher than the threshold voltage, the voltage comparison circuit can enable the second switching circuit to be conducted, the second switching circuit can enable the first switching circuit to be turned off, and the output end of the protection circuit does not output the voltage higher than the threshold voltage, so that overvoltage protection is achieved.
And if the input voltage falls below the threshold voltage after being higher than the threshold voltage, the protection circuit can also restore to the working state when the input voltage is not higher than the threshold voltage, output the voltage not higher than the threshold voltage, and continue to supply power to the subsequent circuit.
(2) The TL431 circuit is adopted, so that the influence of temperature on a protection circuit can be reduced, and a stable and accurate overvoltage protection function is realized.
(3) The voltage stabilizing unit is arranged, so that impact current and surge current can be absorbed, and the reliability of the protection circuit is improved.
(4) The circuit is simple, software is not involved, and the cost can be reduced.
The exemplary embodiment of the application also provides a chip, which comprises the protection circuit. The Chip may be, but is not limited to, a SOC (System on Chip) Chip, a SIP (System in package ) Chip. The chip realizes overvoltage protection of the chip by integrating the protection circuit.
In the embodiment of the present application, the protection circuit may also be disposed on a PCBA (Printed Circuit Board Assembly, printed circuit board).
The exemplary embodiment of the application also provides an electronic device, which comprises a device main body and the chip arranged in the device main body. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutritional scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a quick charger, an on-board charger, an adapter, a display, a USB (Universal Serial Bus ) docking station, a stylus, a real wireless headset, a car center screen, a car, a smart wearable device, a mobile terminal, a smart home device. The intelligent wearing equipment comprises, but is not limited to, an intelligent watch, an intelligent bracelet and a cervical vertebra massage instrument. Mobile terminals include, but are not limited to, smartphones, notebook computers, tablet computers, POS (point of sales terminal, point of sale terminal) machines. The intelligent household equipment comprises, but is not limited to, an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp. The electronic equipment realizes overvoltage protection of the electronic equipment by arranging the protection circuit.
The foregoing description is not intended to limit the preferred embodiments of the present application, but is not intended to limit the scope of the present application, and any such modifications, equivalents and adaptations of the embodiments described above in accordance with the principles of the present application should and are intended to be within the scope of the present application, as long as they do not depart from the scope of the present application.
Claims (14)
1. A protection circuit, characterized in that the protection circuit comprises a voltage comparison circuit, a first switch circuit, and a second switch circuit for turning off the first switch circuit when an input voltage is higher than a threshold voltage;
the first end of the voltage comparison circuit is connected with the input end of the protection circuit, and the second end of the voltage comparison circuit is connected with the first end of the second switch circuit;
the first end of the first switch circuit is connected with the third end of the second switch circuit, the second end of the first switch circuit is connected with the input end of the protection circuit, and the third end of the first switch circuit is connected with the output end of the protection circuit;
the second end of the second switch circuit is connected with the second end of the first switch circuit.
2. The protection circuit of claim 1, wherein the voltage comparison circuit comprises a first resistance unit, a second resistance unit, and a comparator unit;
the first end of the first resistor unit is connected with the input end of the protection circuit, the second end of the first resistor unit is connected with the first end of the second resistor unit, and the second end of the second resistor unit is grounded;
the first end of the comparator unit is connected with the first end of the second switch circuit, the second end of the comparator unit is connected with the second end of the first resistor unit, and the third end of the comparator unit is grounded.
3. The protection circuit of claim 2, wherein the comparator unit comprises a TL431 circuit;
the reference electrode of the TL431 circuit is connected with the second end of the first resistor unit, the cathode of the TL431 circuit is connected with the first end of the second switch circuit, and the anode of the TL431 circuit is grounded.
4. The protection circuit of claim 1, wherein the first switching circuit comprises a first transistor unit, a fifth resistor unit, and a sixth resistor unit;
the first pole of the first transistor unit is connected with the third end of the second switch circuit, the second pole of the first transistor unit is connected with the input end of the protection circuit, and the third pole of the first transistor unit is connected with the output end of the protection circuit;
a first end of the fifth resistor unit is connected with a first pole of the first transistor unit, and a second end of the fifth resistor unit is connected with a second pole of the first transistor unit;
the first end of the sixth resistor unit is connected with the first pole of the first transistor unit, and the second end of the sixth resistor unit is grounded.
5. The protection circuit of claim 4, wherein the first switching circuit further comprises a first voltage regulator unit having a first terminal coupled to a first pole of the first transistor unit and a second terminal coupled to a second pole of the first transistor unit.
6. The protection circuit of claim 5, wherein the first voltage regulator unit comprises a voltage regulator diode.
7. The protection circuit of any of claims 4-6, wherein the first transistor cell comprises a field effect transistor or a triode.
8. The protection circuit of claim 1, wherein the second switching circuit comprises a switching unit, a third resistance unit, and a fourth resistance unit;
the first end of the third resistor unit is the first end of the second switch circuit, the second end of the third resistor unit is connected with the first end of the fourth resistor unit, and the second end of the fourth resistor unit is connected with the input end of the protection circuit;
the first end of the fourth resistor unit is also connected with the first end of the switch unit.
9. The protection circuit of claim 8, wherein the switching unit comprises a second transistor unit;
the first pole of the second transistor unit is connected with the first end of the fourth resistor unit, the second pole of the second transistor unit is connected with the input end of the protection circuit, and the third pole of the second transistor unit is connected with the first end of the first switch circuit.
10. The protection circuit of claim 9, wherein the second switching circuit further comprises a second voltage regulator unit having a first terminal coupled to the first pole of the second transistor unit and a second terminal coupled to the second pole of the second transistor unit.
11. The protection circuit of claim 10, wherein the second voltage regulator unit comprises a voltage regulator diode.
12. The protection circuit according to any one of claims 9 to 11, wherein the second transistor unit comprises a field effect transistor or a triode.
13. A chip comprising a protection circuit according to any one of claims 1-12.
14. An electronic device comprising the protection circuit of any one of claims 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241401.5U CN219145016U (en) | 2022-12-02 | 2022-12-02 | Protection circuit, chip and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223241401.5U CN219145016U (en) | 2022-12-02 | 2022-12-02 | Protection circuit, chip and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219145016U true CN219145016U (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223241401.5U Active CN219145016U (en) | 2022-12-02 | 2022-12-02 | Protection circuit, chip and electronic equipment |
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| Country | Link |
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| CN (1) | CN219145016U (en) |
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2022
- 2022-12-02 CN CN202223241401.5U patent/CN219145016U/en active Active
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