CN218549490U - Linear overvoltage protection circuit and electronic equipment - Google Patents
Linear overvoltage protection circuit and electronic equipment Download PDFInfo
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- CN218549490U CN218549490U CN202222718274.7U CN202222718274U CN218549490U CN 218549490 U CN218549490 U CN 218549490U CN 202222718274 U CN202222718274 U CN 202222718274U CN 218549490 U CN218549490 U CN 218549490U
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Abstract
The utility model discloses a linear overvoltage crowbar and electronic equipment, wherein the linear overvoltage crowbar comprises a power input end, a power output end, a first switch circuit and a switch control circuit; the first switch circuit is arranged between the power input end and the power output end in series, the controlled end of the switch control circuit is connected with the power output end, and the control end of the switch control circuit is connected with the first switch circuit. The utility model discloses a switch control circuit detects power output end's output voltage to when detecting power output end's output voltage excessive pressure, control first switch circuit and turn-off, with the electricity between disconnect-supply input end and the power output end to be connected, damage in order to avoid electronic equipment excessive pressure, thereby improve electronic equipment's security.
Description
Technical Field
The utility model relates to an overvoltage protection technical field, in particular to linear overvoltage crowbar and electronic equipment.
Background
For most electronic devices, the basic condition for ensuring safe and reliable operation is a stable input supply voltage.
In practical situations, the external power source may have an unsuitable condition, such as unstable voltage of the external power source or a phenomenon with high energy pulse, and if the electronic device is connected to the external power source, it may cause abnormal conditions such as overvoltage and the like to occur in the subsequent important circuits and electronic components in the electronic device, or even cause damage to the electronic device.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a linear overvoltage crowbar aims at solving the problem that external power supply has high energy pulse and easily leads to electronic equipment to damage.
In order to achieve the above object, the utility model provides a linear overvoltage protection circuit, linear overvoltage protection circuit includes:
a power input terminal and a power output terminal;
the first switch circuit is arranged between the power supply input end and the power supply output end in series and is used for controlling the power supply input end and the power supply output end to be electrically connected when the first switch circuit is switched on;
the power supply comprises a power supply output end, a switch control circuit, a controlled end of the switch control circuit and a control end of the switch control circuit, wherein the controlled end of the switch control circuit is connected with the power supply output end, the control end of the switch control circuit is connected with a first switch circuit, the switch control circuit is used for detecting the output voltage of the power supply output end, and when the output voltage of the power supply output end is detected to be overvoltage, the first switch circuit is controlled to be switched off so as to be disconnected with the electric connection between the power supply input end and the power supply output end.
In an embodiment, the switch control circuit is further configured to, after controlling the first switch circuit to disconnect the electrical connection between the power input terminal and the power output terminal, control the first switch circuit to be turned on when detecting that the output voltage of the power output terminal is recovered to be normal, so as to control the power input terminal and the power output terminal to recover the electrical connection.
In one embodiment, the switch control circuit comprises a switch maintaining circuit and an overvoltage turn-off circuit; the switch maintaining circuit is arranged between the power supply input end and the first switch circuit in series, the input end of the overvoltage turn-off circuit is connected with the power supply input end, the controlled end of the overvoltage turn-off circuit is connected with the power supply output end, and the output end of the overvoltage turn-off circuit is grounded.
In an embodiment, the switch maintaining circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the power input terminal, the other end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is further connected to the controlled terminal of the first switch circuit, and the other end of the second resistor is grounded.
In an embodiment, the overvoltage shutdown circuit includes a third resistor, a fourth resistor, a first switch tube and a second switch tube, the controlled end of the first switch tube is connected to the power output end through the third resistor, the controlled end of the second switch tube is connected to the input end of the first switch tube through the fourth resistor, and the input end of the second switch tube is connected to the power input end.
In an embodiment, the first switch tube is an NPN-type transistor, and the second switch tube is a PNP-type transistor.
In an embodiment, the linear overvoltage protection circuit further includes a reference voltage circuit, an input terminal of the reference voltage circuit is connected to the power output terminal, an output terminal of the reference voltage circuit is connected to the controlled terminal of the overvoltage shutdown circuit, and the reference voltage circuit is configured to trigger the overvoltage shutdown circuit when the output voltage of the power output terminal exceeds a reference voltage value.
In one embodiment, the reference voltage circuit is a zener diode.
In an embodiment, the linear overvoltage protection circuit further includes a voltage stabilizing circuit, the voltage stabilizing circuit is serially connected between the switch maintaining circuit and the first switch circuit, and the voltage stabilizing circuit is configured to output an input voltage of the power input terminal after stabilizing the voltage.
The utility model also provides an electronic equipment, electronic equipment includes foretell linear overvoltage crowbar.
The utility model discloses technical scheme passes through the output voltage that the on-off control circuit detected power output end to when detecting power output end's output voltage excessive pressure, the shutoff of the first switch circuit of control to the electricity between disconnection power input end and the power output end is connected, stops to carry the power of high voltage to electronic equipment promptly, avoids electronic equipment to burn out because of the excessive pressure, thereby improves electronic equipment's security.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is an overall block diagram of an embodiment of the linear overvoltage protection circuit of the present invention;
fig. 2 is a circuit diagram of another embodiment of the linear overvoltage protection circuit of the present invention;
fig. 3 is a circuit diagram of another embodiment of the linear overvoltage protection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name(s) | Reference numerals | Name (R) | |
| 10 | First switch circuit | Q1 | |
|
| 20 | Switch control circuit | Q2 | |
|
| 30 | Reference voltage circuit | | PMOS tube | |
| 40 | Voltage stabilizing circuit | R1～R4 | First to |
|
| 21 | Overvoltage shutoff circuit | R5 | Current-limiting |
|
| 22 | Switch holding circuit | Z1 | Voltage stabilizing diode | |
| Vin | Power input terminal | Vout | Power supply output terminal |
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a linear overvoltage protection circuit.
At present, an external power supply connected with electronic equipment has the condition of unstable voltage or high-energy pulse, which may cause abnormal conditions such as overvoltage and the like of subsequent important circuits and electronic elements in the electronic equipment, and even damage the subsequent important circuits and the electronic elements.
In order to solve the above problem, referring to fig. 1 to 3, in an embodiment of the present invention, the linear overvoltage protection circuit is applied to an electronic device, and the high-energy pulse can be eliminated by the linear overvoltage protection circuit to provide a suitable operating voltage for the electronic device, so as to prevent the electronic device from being damaged due to overvoltage. The linear overvoltage protection circuit includes: a power input terminal Vin and a power output terminal Vout; the first switch circuit 10, the first switch circuit 10 is arranged in series between the power input terminal Vin and the power output terminal Vout, the first switch circuit 10 is configured to control the power input terminal Vin and the power output terminal Vout to be electrically connected when conducting; the control end of the switch control circuit 20 is connected to the power output end Vout, the control end of the switch control circuit 20 is connected to the first switch circuit 10, and the switch control circuit 20 is configured to detect an output voltage of the power output end Vout, and control the first switch circuit 10 to turn off when detecting that the output voltage of the power output end Vout is overvoltage, so as to disconnect the electrical connection between the power input end Vin and the power output end Vout.
The first switch circuit 10 can be implemented by using a high voltage PMOS transistor Q3, and when the voltage of the gate of the PMOS transistor Q3GS is greater than the turn-on voltage of the gate of the PMOS transistor Q3GS, the switch circuit is turned on, and the specific voltage withstanding value of the PMOS transistor Q3 can be selected according to the range of the input voltage of the power input terminal Vin. Specifically, when the input voltage of the power input end Vin is greater than the turn-on voltage of the gate of the PMOS transistor Q3GS, the PMOS transistor Q3 is turned on, even though the power input end Vin is connected with the power output end Vout; when the input voltage of the power input end Vin is smaller than the turn-on voltage of the gate of the PMOS transistor Q3GS, the PMOS transistor Q3 is turned off, i.e., a loop between the power input end Vin and the power output end Vout is turned off, thereby controlling the on/off between the power input end Vin and the power output end Vout.
The switch control circuit 20 may adopt any switch control circuit 20 that can control the first switch circuit 10 to turn off when detecting the output voltage of the power output terminal Vout is over-voltage. Specifically, the switch control circuit 20 may include a switch maintaining circuit 22 and an overvoltage shutdown circuit 21, where the overvoltage shutdown circuit 21 is turned on when detecting that the output voltage of the power output terminal Vout is overvoltage, that is, the switch maintaining circuit 22 is disconnected from the power input terminal Vin, so as to control the first switch circuit 10 to be turned off to disconnect the electrical connection between the power input terminal Vin and the power output terminal Vout; then, when the overvoltage shutdown circuit 21 detects that the output voltage of the power output terminal Vout returns to normal, the overvoltage shutdown circuit is turned off, that is, the switch maintaining circuit 22 is turned on to connect the power input terminal Vin, so as to control the first switch circuit 10 to be turned on, so as to turn on the electrical connection between the power input terminal Vin and the power output terminal Vout, and control the first switch circuit 10 to be turned on and off through the switch maintaining circuit 22 and the overvoltage shutdown circuit 21.
The utility model discloses technical scheme passes through switch control circuit 20 and detects power output terminal Vout's output voltage to when detecting power output terminal Vout's output voltage excessive pressure, control first switch circuit 10 and turn-off, with the electricity between disconnection power input terminal Vin and the power output terminal Vout be connected, stop promptly to provide the high voltage power supply to electronic equipment, burn out because of the excessive pressure in order to avoid electronic equipment, thereby improve electronic equipment's security.
Referring to fig. 1 to fig. 3, in an embodiment, the switch control circuit 20 is further configured to, after controlling the first switch circuit 10 to disconnect the electrical connection between the power input terminal Vin and the power output terminal Vout, and when detecting that the output voltage of the power output terminal Vout is recovered to be normal, control the first switch circuit 10 to be turned on to control the power input terminal Vin and the power output terminal Vout to recover to be electrically connected.
In this embodiment, after the switch control circuit 20 controls the first switch circuit 10 to turn off when the output voltage of the power output terminal Vout is over-voltage, the output voltage of the power output terminal Vout starts to drop, and when the switch control circuit 20 detects that the output voltage of the power output terminal Vout is restored to normal, the first switch circuit 10 is controlled to turn on, so that the power input terminal Vin and the power output terminal Vout are electrically restored, and the cycle is repeated to output linear voltage, so that high-amplitude and long-time high-energy pulses can be effectively removed to realize over-voltage protection, and the electronic device can be prevented from being damaged in a high-voltage working occasion.
Referring to fig. 2 and 3, in an embodiment, the switch control circuit 20 includes a switch maintaining circuit 22 and an overvoltage shutdown circuit 21; the switch maintaining circuit 22 is serially connected between the power input terminal Vin and the first switch circuit 10, the input terminal of the overvoltage shutdown circuit 21 is connected to the power input terminal Vin, the controlled terminal of the overvoltage shutdown circuit 21 is connected to the power output terminal Vout, and the output terminal of the overvoltage shutdown circuit 21 is grounded.
The switch maintaining circuit 22 may be implemented by a voltage dividing circuit, and divides the input voltage at the power input terminal Vin and outputs the divided voltage to the first switch circuit 10. Specifically, the switch holding circuit 22 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the power input terminal Vin, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the first resistor R1 is further connected to the controlled terminal of the first switch circuit 10, and the other end of the second resistor R2 is grounded. In this embodiment, when the voltage of the first resistor R1 is greater than the turn-on voltage of the gate of the PMOS transistor Q3GS, the PMOS transistor Q3 is turned on, that is, the power input terminal Vin is connected to the power output terminal Vout; on the contrary, when the voltage of the first resistor R1 is smaller than the turn-on voltage of the gate of the PMOS transistor Q3GS, the PMOS transistor Q3 is turned off, i.e. the circuit between the power input terminal Vin and the power output terminal Vout is cut off, thereby controlling the on/off of the PMOS transistor Q3.
The overvoltage shutdown circuit 21 may be implemented using a switching circuit. Specifically, the overvoltage shutdown circuit 21 includes a third resistor R3, a fourth resistor R4, a first switch tube Q1 and a second switch tube Q2, the controlled end of the first switch tube Q1 is connected to the power output terminal Vout through the third resistor R3, the controlled end of the second switch tube Q2 is connected to the input end of the first switch tube Q1 through the fourth resistor R4, and the input end of the second switch tube Q2 is connected to the power input terminal Vin. It should be noted that the first switching tube Q1 is an NPN-type triode, and the second switching tube Q2 is a PNP-type triode. When the power output terminal Vout is over-voltage, the NPN transistor may be turned on, so that the PNP transistor is turned on, i.e., the connection between the switch maintaining circuit 22 and the power input terminal Vin is disconnected, thereby controlling the first switch circuit 10 to be turned off, so as to disconnect the electrical connection between the power input terminal Vin and the power output terminal Vout; when the output voltage of the power output terminal Vout returns to normal, the NPN type transistor is turned off, so that the PNP type transistor is turned off, i.e., the switch holding circuit 22 is connected to the power input terminal Vin, thereby controlling the first switch circuit 10 to be turned on, so as to electrically connect the power input terminal Vin and the power output terminal Vout, and controlling the on/off between the power input terminal Vin and the power output terminal Vout through the overvoltage turn-off circuit 21.
In the present embodiment, the overvoltage shutdown circuit 21 is turned on when detecting that the output voltage of the power output terminal Vout is overvoltage, i.e. the connection between the switch maintaining circuit 22 and the power input terminal Vin is disconnected, so as to control the first switch circuit 10 to be turned off to disconnect the electrical connection between the power input terminal Vin and the power output terminal Vout; then, when the overvoltage shutdown circuit 21 detects that the output voltage of the power output terminal Vout returns to normal, the overvoltage shutdown circuit is turned off, that is, the switch maintaining circuit 22 is turned on to connect the power input terminal Vin, so as to control the first switch circuit 10 to be turned on, so as to turn on the electrical connection between the power input terminal Vin and the power output terminal Vout, and control the first switch circuit 10 to be turned on and off through the switch maintaining circuit 22 and the overvoltage shutdown circuit 21.
Referring to fig. 2 and 3, in an embodiment, the linear overvoltage protection circuit further includes a reference voltage circuit 30, an input terminal of the reference voltage circuit 30 is connected to the power output terminal Vout, an output terminal of the reference voltage circuit 30 is connected to the controlled terminal of the overvoltage shutdown circuit 21, and the reference voltage circuit 30 is configured to trigger the overvoltage shutdown circuit 21 when the output voltage of the power output terminal Vout exceeds a reference voltage value.
The reference voltage circuit 30 may be implemented by a zener diode Z1 or a three-terminal regulator. In this embodiment, the reference voltage circuit 30 is implemented by a zener diode Z1, and compared with a three-terminal regulator, the circuit is simpler and has lower cost. It is worth noting that a current limiting resistor R5 is arranged at the output end of the zener diode Z1 to protect the zener diode Z1 and avoid burning out due to overvoltage.
In this embodiment, under the condition that the input voltage of the power input terminal Vin is smaller than the reference voltage value, since the output voltage of the power output terminal Vout is always smaller than the reference voltage value, the overvoltage shutdown circuit 21 is always in the off state, that is, the first switch circuit 10 is still in the fully on state, and finally the output voltage of the power output terminal Vout is equal to the input voltage of the power input terminal Vin; under the condition that the input voltage of the power input end Vin is greater than the reference voltage value, because the output voltage of the power output end Vout is greater than the reference voltage value, the overvoltage shutdown circuit 21 is in a conducting state, thereby disconnecting the connection between the switch maintaining circuit 22 and the power input end Vin, i.e. controlling the first switch circuit 10 to be turned off, so as to disconnect the electrical connection between the power input end Vin and the power output end Vout, and then the output voltage of the power output end Vout begins to drop until the output voltage of the power output end Vout is less than the reference voltage value, the overvoltage shutdown circuit 21 is in a disconnecting state, i.e. the first switch circuit 10 is turned on, so as to connect the electrical connection between the power input end Vin and the power output end Vout, high-amplitude and long-time high-energy pulses are effectively removed through the reference voltage circuit 30 to realize overvoltage protection, and the output voltage of the power output end Vout is maintained within the reference voltage range, so as to provide a linear voltage close to the electronic device, so as to avoid generating electromagnetic interference.
Referring to fig. 2 and 3, in an embodiment, the linear overvoltage protection circuit further includes a voltage stabilizing circuit 40, the voltage stabilizing circuit 40 is serially connected between the switch maintaining circuit 22 and the first switch circuit 10, and the voltage stabilizing circuit 40 is configured to stabilize an input voltage at the power input terminal Vin and output the stabilized voltage.
The voltage regulator circuit 40 may be implemented by any voltage regulator circuit 40 capable of regulating the voltage of the input power, such as a zener diode.
In the present embodiment, the voltage regulator 40 is disposed between the switch maintaining circuit 22 and the first switch circuit 10, and outputs the input voltage after performing voltage regulation processing, so as to protect the first switch circuit 10, i.e. protect the GS electrode of the PMOS transistor Q3, and avoid the PMOS transistor Q3 from being burned out due to overvoltage.
With the above embodiments, the inventive concept of the present invention is explained, in case one, the input voltage of the power input terminal Vin is less than the circuit working condition of the regulated voltage value of the zener diode Z1: when power-on is started, vr voltage is 0V, the first switch tube Q1 is in a cut-off state, the second switch tube Q2 is also in a cut-off state, the first resistor R1 and the second resistor R2 form a voltage division circuit, and the voltage divided by the first resistor R1 is larger than the starting voltage of a PMOS tube Q3GS electrode, so that the PMOS tube Q3 is conducted, and the output voltage of a power output end Vout starts to rise. Because the input voltage Vin is smaller than the regulated voltage value of the zener diode Z1, the first switch Q1 and the second switch Q2 still work in the off state, the PMOS transistor Q3 still works in the fully on state, and finally the working voltage of the electronic device is equal to the input voltage of the power input terminal Vin.
In case two, the circuit operating condition that the input voltage of the power input terminal Vin is greater than the regulated voltage value of the zener diode Z1 is as follows: when power-on is started, vr voltage is 0V, the first switch tube Q1 is in a cut-off state, the second switch tube Q2 is also in a cut-off state, the first resistor R1 and the second resistor R2 form a voltage division circuit, and the voltage divided by the first resistor R1 is larger than the starting voltage of a Q3GS electrode of the PMOS tube, so that the PMOS tube Q3 is conducted, and the output voltage of a Vout of the power supply output end begins to rise; when the output voltage of the power output terminal Vout is greater than the regulated voltage value of the zener diode Z1 and the Vr voltage is greater than 0.7V, the first switch tube Q1 is in a conducting state, the second switch tube Q2 is also in a conducting state, and since the second switch tube Q2 is conducting, the voltage of the first resistor R1 is 0V, that is, the voltage of the gate of the PMOS transistor Q3GS is less than the turn-on voltage of the PMOS transistor Q3, and the PMOS transistor Q3 is turned off. The PMOS tube Q3 is disconnected, the output voltage of the power output end Vout begins to drop, vr voltage also drops along with the drop, when the Vr voltage is smaller than 0.7V, the first switch tube Q1 is in a cut-off state, the second switch tube Q2 is also in a cut-off state, the voltage of the first resistor R1 is larger than the starting voltage of the GS electrode of the PMOS tube Q3, the PMOS tube Q3 is conducted again, the output voltage of the power output end Vout begins to rise, and the operation is repeated in a cycle, so that the output voltage of the power output end Vout is always kept near the voltage stabilizing value range of the voltage stabilizing diode Z1, and the electronic equipment can work at stable voltage.
The Vr voltage is a voltage at the positive terminal of the zener diode Z1. After the PMOS tube Q3 is disconnected, when the output voltage of the power output end Vout is smaller than the regulated voltage value of the voltage regulator diode Z1, the PMOS tube Q3 is conducted again, so that the output voltage of the power output end Vout is always kept near the regulated voltage value range of the voltage regulator diode Z1, and the output voltage of the power output end Vout is not a square wave but is a linear voltage close to linearity, so that the generation of electromagnetic interference is avoided.
In conclusion, the linear overvoltage protection circuit can effectively remove high-amplitude and long-time high-energy pulses, so that overvoltage protection is performed on electronic equipment.
The utility model also provides an electronic equipment, this electronic equipment includes the above-mentioned linear overvoltage crowbar; the specific structure of the linear overvoltage protection circuit refers to the above embodiments, and since the electronic device adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here.
In the embodiment, the output voltage of the power output terminal Vout is detected by the linear overvoltage protection circuit to control the on/off of the first switch circuit 10, and high-energy pulses with high amplitude and long time are removed, so that the output voltage is kept within a reference voltage range, a stable working voltage is provided for the electronic device, and the safety of the electronic device is improved.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A linear overvoltage protection circuit, characterized in that the linear overvoltage protection circuit comprises:
a power input terminal and a power output terminal;
the first switch circuit is arranged between the power supply input end and the power supply output end in series and is used for controlling the power supply input end and the power supply output end to be electrically connected when the first switch circuit is switched on;
the power supply comprises a power supply output end, a switch control circuit, a controlled end of the switch control circuit and a control end of the switch control circuit, wherein the controlled end of the switch control circuit is connected with the power supply output end, the control end of the switch control circuit is connected with a first switch circuit, the switch control circuit is used for detecting the output voltage of the power supply output end, and when the output voltage of the power supply output end is detected to be overvoltage, the first switch circuit is controlled to be switched off so as to be disconnected with the electric connection between the power supply input end and the power supply output end.
2. The linear overvoltage protection circuit of claim 1, wherein the switch control circuit is further configured to control the first switch circuit to turn on to control the power input terminal and the power output terminal to be electrically connected when detecting that the output voltage at the power output terminal is restored to normal after controlling the first switch circuit to electrically disconnect the power input terminal and the power output terminal.
3. The linear overvoltage protection circuit of claim 1, wherein said switch control circuit includes a switch hold circuit and an overvoltage shutdown circuit; the switch maintaining circuit is arranged between the power supply input end and the first switch circuit in series, the input end of the overvoltage turn-off circuit is connected with the power supply input end, the controlled end of the overvoltage turn-off circuit is connected with the power supply output end, and the output end of the overvoltage turn-off circuit is grounded.
4. The linear overvoltage protection circuit of claim 3, wherein said switch holding circuit includes a first resistor and a second resistor, one end of said first resistor is connected to said power input terminal, the other end of said first resistor is connected to one end of said second resistor, the other end of said first resistor is further connected to a controlled terminal of said first switch circuit, and the other end of said second resistor is connected to ground.
5. The linear overvoltage protection circuit according to claim 3, wherein said overvoltage shutdown circuit comprises a third resistor, a fourth resistor, a first switch transistor and a second switch transistor, wherein a controlled terminal of said first switch transistor is connected to said power output terminal through said third resistor, a controlled terminal of said second switch transistor is connected to an input terminal of said first switch transistor through said fourth resistor, and an input terminal of said second switch transistor is connected to said power input terminal.
6. The linear overvoltage protection circuit according to claim 5, wherein the first switching transistor is an NPN transistor and the second switching transistor is a PNP transistor.
7. The linear overvoltage protection circuit according to claim 3, further comprising a reference voltage circuit, an input of the reference voltage circuit being connected to the power supply output, an output of the reference voltage circuit being connected to the controlled terminal of the overvoltage shutdown circuit, the reference voltage circuit being configured to trigger the overvoltage shutdown circuit when the output voltage of the power supply output exceeds a reference voltage value.
8. The linear overvoltage protection circuit of claim 7, wherein said reference voltage circuit is a zener diode.
9. The linear overvoltage protection circuit of claim 7, further comprising a voltage regulator circuit, the voltage regulator circuit being serially disposed between the switch holding circuit and the first switch circuit, the voltage regulator circuit being configured to regulate an input voltage at the power input and output the regulated voltage.
10. An electronic device, characterized in that the electronic device comprises a linear overvoltage protection circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718274.7U CN218549490U (en) | 2022-10-14 | 2022-10-14 | Linear overvoltage protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222718274.7U CN218549490U (en) | 2022-10-14 | 2022-10-14 | Linear overvoltage protection circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218549490U true CN218549490U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222718274.7U Active CN218549490U (en) | 2022-10-14 | 2022-10-14 | Linear overvoltage protection circuit and electronic equipment |
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| CN (1) | CN218549490U (en) |
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- 2022-10-14 CN CN202222718274.7U patent/CN218549490U/en active Active
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Address after: Room 602, Building B, Building 4, Baolong Intelligent Garden, Baolong Community, Baolong Street, Longgang District, Shenzhen City, Guangdong Province 518000, China Patentee after: GREEN ENERGY BATTERY Co.,Ltd. Country or region after: China Address before: 518000 South China International leather and leather raw materials logistics zone phase II, No.1 South China Avenue, Hehua community, Pinghu street, Longgang District, Shenzhen City, Guangdong Province 5h015-022, 5h07-012, 5h042-049, 5h053-060, 5h081-088 Patentee before: GREEN ENERGY BATTERY Co.,Ltd. Country or region before: China |