CN113067320A - Surge protection circuit and voltage adjustment method for surge protection circuit - Google Patents

Surge protection circuit and voltage adjustment method for surge protection circuit Download PDF

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Publication number
CN113067320A
CN113067320A CN202110343537.8A CN202110343537A CN113067320A CN 113067320 A CN113067320 A CN 113067320A CN 202110343537 A CN202110343537 A CN 202110343537A CN 113067320 A CN113067320 A CN 113067320A
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voltage
electrically connected
ptvs
interface
vrwm
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CN113067320B (en
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王勇
李兵虎
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
    • H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006—Calibration or setting of parameters

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The application discloses a surge protection circuit and a voltage adjusting method of the surge protection circuit, wherein the surge protection circuit comprises a first interface, a second interface, a PTVS (pan/tilt/zoom) tube, a voltage detector, a voltage controller and a voltage reducer; the cathode of the PTVS tube is electrically connected with the output end of the voltage reducer, the anode of the PTVS tube is electrically connected with the second interface, and the second interface is grounded; the voltage detector is electrically connected with the first interface and used for detecting a first voltage, and the voltage detector is connected with the voltage controller so as to transmit the first voltage to the voltage controller; the input end of the voltage reducer is electrically connected with the first interface, the output end of the voltage reducer is electrically connected with the PTVS tube, and the control end of the voltage reducer is electrically connected with the voltage controller; the voltage controller is used for adjusting a second voltage at the output end of the voltage reducer according to the first voltage and the maximum reverse working voltage Vrwm of the PTVS tube, so that the second voltage is close to the maximum reverse working voltage Vrwm.

Description

Surge protection circuit and voltage adjustment method for surge protection circuit
Technical Field
The application belongs to the technical field of electronics, and particularly relates to a surge protection circuit and a voltage adjusting method of the surge protection circuit.
Background
A power transient-voltage-suppression (PTVS) device is a commonly used protection device, and is used in current mobile phones and mobile devices. The PTVS tube can absorb the surge rapidly, and the damage of the surge to the integrated circuit is avoided. When the surge voltage reaches the maximum reverse Working voltage (Vrwm) of the PTVS tube, the PTVS tube avalanche breaks down to form a discharge channel to the ground, and the surge voltage is conducted to the ground, so that the integrated circuit is protected.
The Vrwm of the PTVS tube is a fixed value, but the voltage of the integrated circuit typically varies depending on the battery voltage. For example, the Vrwm of some PTVS tubes is 5V, while the voltage of the integrated circuit varies with the battery voltage, ranging from 3.4V to 4.45V. Therefore, the PTVS tube can only play a role of protection when the surge voltage reaches 5V or more, and the PTVS tube cannot play a role of protection when the surge voltage does not reach 5V, so that the integrated circuit cannot be protected to the maximum.
Disclosure of Invention
An object of the embodiments of the present application is to provide a surge protection circuit and a voltage adjustment method for the surge protection circuit, which can protect an integrated circuit to the maximum.
In order to solve the technical problem, the following technical scheme is adopted in the application:
in a first aspect, an embodiment of the application discloses a surge protection circuit, which includes a first interface, a second interface, a PTVS tube, a voltage detector, a voltage controller and a voltage reducer; the cathode of the PTVS tube is electrically connected with the output end of the voltage reducer, the anode of the PTVS tube is electrically connected with the second interface, and the second interface is grounded; the voltage detector is electrically connected with the first interface and used for detecting a first voltage, and the voltage detector is connected with the voltage controller so as to transmit the first voltage to the voltage controller, wherein the first voltage is the voltage at the first interface and is not greater than a preset threshold value; the input end of the voltage reducer is electrically connected with the first interface, the output end of the voltage reducer is electrically connected with the PTVS tube, and the control end of the voltage reducer is electrically connected with the voltage controller; the voltage controller is used for adjusting a second voltage at the output end of the voltage reducer according to the first voltage and a maximum reverse working voltage Vrwm of the PTVS tube, so that the second voltage is close to the maximum reverse working voltage Vrwm.
In a second aspect, an embodiment of the present application discloses a voltage adjustment method for a surge protection circuit, where the method includes: acquiring the first voltage; and adjusting the second voltage according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage to enable the second voltage to be close to the maximum reverse working voltage Vrwm.
In a third aspect, an embodiment of the present application provides an electronic device, including the surge protection circuit described in the first aspect.
In a fourth aspect, the present application provides an electronic device, where the terminal device includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions, when executed by the processor, implement the steps of the method according to the second aspect.
In a fifth aspect, the present application provides a computer-readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the second aspect.
The technical scheme adopted by the application can achieve the following beneficial effects:
according to the surge protection circuit disclosed by the embodiment of the application, the first voltage at the first interface is detected through the voltage detector and is transmitted to the voltage controller, and the voltage controller adjusts the second voltage at the output end of the voltage reducer according to the first voltage and the maximum reverse working voltage Vrwm of the PTVS tube, so that the second voltage is close to the maximum reverse working voltage Vrwm. Therefore, the input voltage of the PTVS tube can be dynamically adjusted according to the voltage at the first interface, so that the input voltage of the PTVS tube is close to the maximum reverse working voltage Vrwm, and the integrated circuit can be protected in the maximum range.
Drawings
Fig. 1 is a schematic structural diagram of a surge protection circuit disclosed in an embodiment of the present application;
fig. 2 is a schematic diagram of another structure of a surge protection circuit disclosed in an embodiment of the present application;
fig. 3 is a schematic diagram of another structure of a surge protection circuit disclosed in the embodiment of the present application;
fig. 4 is a flowchart of a voltage adjustment method of a surge protection circuit disclosed in an embodiment of the present application;
fig. 5 is another flowchart of a voltage regulation method of a surge protection circuit disclosed in an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
A surge protection circuit provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Fig. 1 is a schematic structural diagram of a surge protection circuit disclosed in an embodiment of the present application, and as shown in fig. 1, the surge protection circuit mainly includes a first interface 110, a second interface 120, a PTVS tube 240, a voltage detector 210, a voltage controller 220, and a voltage reducer 230.
In the embodiment of the present application, the cathode of the PTVS tube 240 is electrically connected to the output terminal of the voltage reducer 230, the anode of the PTVS tube 240 is electrically connected to the second interface 120, and the second interface 120 is grounded; the voltage detector 210 is electrically connected to the first interface 110, the voltage detector 210 is configured to detect a first voltage, and the voltage detector 210 is connected to the voltage controller 220 to transmit the first voltage to the voltage controller 220, where in this embodiment, the first voltage is a voltage at the first interface 110, and the first voltage is not greater than a preset threshold; the input end of the voltage reducer 230 is electrically connected with the first interface 110, the output end of the voltage reducer 230 is electrically connected with the PTVS tube 240, and the control end of the voltage reducer 230 is electrically connected with the voltage controller 220; the voltage controller 220 is configured to adjust a second voltage at the output terminal of the voltage reducer 230 according to the first voltage and a maximum reverse working voltage Vrwm of the PTVS tube 240, so that the second voltage approaches the maximum reverse working voltage Vrwm.
In a specific application, the first interface 110 is electrically connected to an integrated circuit to be protected by the surge protection circuit, so that the voltage at the first interface 110, i.e. the first voltage, is the voltage of the integrated circuit to be protected, and the voltage must not be greater than a preset threshold, and the preset threshold may be set to Vrwm + Δ V for the maximum range of protection of the integrated circuit, where Δ V is not greater than the maximum step-down value of the step-down device 230. When surge energy comes, the surge energy enters from the first interface 110, passes through the voltage reducer 230, and then enters the PTVS tube 240, the PTVS tube 240 breaks down in an avalanche, and the surge energy passes through the PTVS tube 240 and is guided into the ground from the second interface 120.
The surge protection circuit disclosed in the embodiment of the application is additionally provided with the voltage detector 210, the voltage controller 220 and the voltage reducer 230 on the basis of the original PTVS tube 240, can be dynamically adjusted according to the voltage of an integrated circuit to be protected, and ensures that the voltage transmitted to the PTVS tube 240 is close to the maximum reverse working voltage Vrwm, so that the integrated circuit is protected in the maximum range.
In the embodiment of the present application, the PTVS tube 240 with the lower maximum reverse working voltage Vrwm may be selected, and the voltage borne by the voltage reducer 230 is combined to achieve a higher protection voltage.
In one possible implementation, the voltage controller 220 may be configured to determine a control parameter according to the first voltage and a maximum reverse working voltage Vrwm of the PTVS tube 240, send the control parameter to the voltage reducer 230, and the voltage reducer 230 adjusts the magnitude of the second voltage according to the control parameter so that the second voltage approaches the maximum reverse working voltage Vrwm.
In one possible implementation, as shown in fig. 2, the voltage reducer 230 may include a field effect transistor 231, wherein a gate of the field effect transistor 231 is electrically connected to the voltage controller 220, a drain of the field effect transistor 231 is electrically connected to the first interface 110, and a source of the field effect transistor 231 is electrically connected to a cathode of the PTVS transistor 240. Specifically, the voltage detector 210 detects a first voltage, transmits the first voltage to the voltage controller 220, the voltage controller 220 determines a control parameter according to the first voltage and a maximum reverse operating voltage Vrwm of the PTVS 240, the control parameter is a gate-source voltage input to a gate of the fet 231, and the fet 231 adjusts an output second voltage according to the gate-source voltage, so that the second voltage is close to the maximum reverse operating voltage Vrwm. When the surge energy comes, that is, the voltage input to the first interface 110 is greater than the preset threshold, the surge energy enters from the first interface 110 and is transmitted to the fet 231, the voltage output from the source of the fet 231 is greater than the maximum reverse operating voltage Vrwm of the PTVS 240 and is transmitted to the PTVS 240, the PTVS 240 avalanche breaks down, and the surge energy passes through the PTVS 240 and enters the ground along the second interface 120.
In one possible implementation manner of the embodiment of the present application, the voltage reducer 230 may further include a transistor, wherein a base of the transistor is electrically connected to the voltage controller 220, a collector of the transistor is electrically connected to the first interface 110, and an emitter of the transistor is electrically connected to a cathode of the PTVS tube 240. The specific implementation is similar to the above-mentioned field effect transistor 231, and is not described herein again.
In the above possible implementation manner, when the voltage of the integrated circuit to be protected by the surge protection circuit changes, that is, the first voltage changes, the voltage controller 220 determines a new control parameter according to the changed first voltage and the maximum reverse working voltage Vrwm of the PTVS tube 240, and the voltage reducer 230 adjusts the voltage according to the new control parameter to protect the integrated circuit in the maximum range. For example, when the first voltage changes, the voltage controller 220 may output different gate-source voltages, and the fet 231 may output different second voltages according to the gate-source voltage, so as to protect the integrated circuit to the maximum.
In another possible implementation manner, as shown in fig. 3, the voltage reducer 230 may further include a plurality of field effect transistors 231, wherein the voltage controller 220 is electrically connected to gates of the plurality of field effect transistors 231, drains of the plurality of field effect transistors 231 are electrically connected to the first interface 110 after being connected in parallel, and sources of the plurality of field effect transistors 231 are electrically connected to a cathode of the PTVS transistor 240 after being connected in parallel.
Optionally, the voltage reducer 230 may further include a plurality of transistors, wherein the voltage controller 220 is electrically connected to bases of the plurality of transistors, collectors of the plurality of transistors are electrically connected to the first interface 110 after being connected in parallel, and emitters of the plurality of transistors are electrically connected to a cathode of the PTVS tube 240 after being connected in parallel.
In the above-mentioned embodiments, when the first voltage is changed, the voltage controller 220 re-determines the control parameter according to the changed first voltage and the maximum reverse working voltage Vrwm of the PTVS 240, and turns on the corresponding fet 231 or transistor according to the re-determined control parameter to output the corresponding second voltage, thereby protecting the integrated circuit to the maximum extent. Taking the example that the voltage reducer 230 includes a plurality of field effect transistors 231, the maximum reverse working voltage Vrwm of the PTVS tube 240 is 5V, when the surge protection circuit is powered on for the first time, the first voltage detected by the voltage detector 210 is 5.5V, and the voltage controller 220 determines that the voltage reduction of 0.6V is required according to the first voltage and the maximum reverse working voltage Vrwm, and corresponds to the first field effect transistor 231, so that the first field effect transistor 231 is turned on, and the second field effect transistor 231 is turned off. When the surge protection circuit is powered on for the second time, the first voltage value detected by the voltage detector 210 is 5V, and the voltage controller 220 determines again that the voltage needs to be reduced by 0.1V according to the changed first voltage and the maximum reverse working voltage Vrwm, and corresponds to the second fet 231, so that the second fet 231 is turned on and the first fet 231 is turned off. Therefore, the input voltage of the PTVS tube 240 can be adjusted when the working voltage of the protected device changes, so as to achieve maximum protection of the integrated circuit.
Optionally, when the first voltage is closer to the maximum reverse working voltage Vrwm and a single fet 231 or transistor cannot achieve a lower step-down, the fet 231 and the transistor may be controlled to be turned on according to the control parameter determined by the voltage controller 220, so as to protect the integrated circuit to the maximum.
In the embodiment of the present application, the plurality of field effect transistors 231 or triodes provided for the voltage reducer 230 may dynamically adjust the second voltage output by the voltage reducer 230 according to the voltage of the integrated circuit to be protected, so that the second voltage is always close to the maximum reverse working voltage Vrwm of the PTVS tube 240, thereby protecting the integrated circuit to the maximum, and simultaneously, the normal operation of the integrated circuit is not affected, so that the protection performance is greatly improved.
Fig. 4 is a flowchart of a voltage adjustment method of a surge protection circuit according to an embodiment of the present application, and as shown in fig. 4, the voltage adjustment method of the surge protection circuit mainly includes the following steps.
S410, acquiring the first voltage.
In a specific application, step S410 may be executed by the voltage controller shown in fig. 1 to fig. 3, where the voltage controller may obtain the first voltage in a manner that the voltage detector detects the first voltage and then sends the first voltage to the voltage controller, and a specific implementation manner may refer to the description in the surge protection circuit embodiment, which is not described herein again.
S420, adjusting the second voltage according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage to enable the second voltage to be close to the maximum reverse working voltage Vrwm.
In a specific application, the maximum reverse working voltage Vrwm of the PTVS tube may be prestored in the voltage controller, and in S420, the voltage controller adjusts the magnitude of the second voltage according to the first voltage input by the first interface and the maximum reverse working voltage Vrwm detected by the voltage detector.
According to the voltage adjusting method of the surge protection circuit provided by the embodiment of the application, the first voltage can be detected according to the voltage detector, and the voltage controller adjusts the voltage according to the first voltage and the maximum reverse working voltage Vrwm so as to output the second voltage close to the maximum reverse working voltage Vrwm. Therefore, by adopting the scheme provided by the embodiment of the application, the maximum protection integrated circuit can be realized by adding a voltage detector, a voltage controller and a voltage reducer on the basis of the original PTVS tube.
In one possible implementation, S420: adjusting the second voltage according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage to make the second voltage approach the maximum reverse working voltage Vrwm may include: determining a control parameter according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage; and sending the control parameter to the voltage reducer, and adjusting the second voltage by the voltage reducer according to the control parameter.
In this possible implementation, after sending the control parameter to the voltage reducer, the method may further include:
step 1, acquiring the changed first voltage detected by the voltage detector;
for example, the surge protection circuit is powered on for the second time, the first voltage of the second power-on is changed from the first voltage of the first power-on, and the voltage detector acquires the changed first voltage. Of course, the changed first voltage is still not greater than the preset threshold.
And 2, updating the control parameter according to the maximum reverse working voltage Vrwm and the changed first voltage, and transmitting the updated control parameter to the voltage reducer to adjust the second voltage at the output end of the voltage reducer so as to enable the second voltage to be close to the maximum reverse working voltage Vrwm.
In the possible implementation manner, the voltage detector detects the changed second voltage, updates the control parameter determined by the voltage controller in time, and the voltage reducer updates the output second voltage according to the new control parameter so as to ensure that the second voltage is still close to the maximum reverse working voltage Vrwm of the PTVS tube after the working voltage of the protected device is changed.
In the above possible implementation manner, after adjusting the output second voltage, the method may further include: and acquiring surge voltage input by the first interface and detected by the voltage detector, and forbidding updating the control parameter according to the surge voltage, so that the second voltage at the output end of the voltage reducer is greater than the maximum reverse working voltage Vrwm. Through the step, when the surge voltage comes, the control parameters are prohibited from being updated according to the surge voltage, so that the surge voltage at the output end of the voltage reducer can be larger than the maximum reverse working voltage Vrwm of the PTVS tube, the PTVS tube can be broken down by the surge voltage, and the surge voltage can be led into the ground from the second interface.
Fig. 5 is a schematic flowchart of another voltage adjustment method for a surge protection circuit according to an embodiment of the present application. As shown in fig. 5, the method may include the following steps.
S510: and powering on the surge protection circuit.
S511: the voltage control module obtains the maximum reverse working voltage Vrwm of the PTVS tube.
In this step, the maximum reverse working voltage Vrwm of the PTVS tube may be pre-stored in the voltage controller, and the voltage controller may obtain the pre-stored maximum reverse working voltage Vrwm after determining power-on.
S512: and judging whether the surge protection circuit is powered on for the first time. If not, S530 is executed, and if the first power up is, S514 is executed.
S530: the voltage detection module detects a first voltage of the protected integrated circuit network.
S531: and judging whether the difference value between the currently detected first voltage and the last detected first voltage is equal to zero, if so, returning to the step S530, and if not, executing the step S532.
S532: the first voltage is updated.
In this step, the data of the first voltage input by the first interface is updated to the value of the currently detected first voltage, and the process proceeds to step S514.
S513: the voltage detection module detects a first voltage of the protected integrated circuit network.
S514: the first voltage is communicated to a voltage controller.
S515: the voltage controller determines a control parameter and outputs the control parameter.
In this step, the voltage controller may determine the control parameter according to the first voltage and the maximum reverse operation voltage Vrwm.
S516: the voltage reduction module adjusts voltage.
In this step, the step-down transformer adjusts the output second voltage according to the control parameter, for example, the second voltage is adjusted to be the maximum reverse working voltage Vrwm minus 0.1, that is, the step-down value of the step-down transformer is: the first voltage- (Vrwm-0.1) and the voltage input to the PTVS tube is the maximum reverse working voltage Vrwm minus 0.1.
S517: and judging whether surge energy enters or not. If a surge is entered, step 518 is entered, otherwise step 530 is returned.
S518: the surge voltage transmitted across the PTVS tube is greater than or equal to the maximum reverse working voltage Vrwm.
S519: the PTVS tube breaks down in an avalanche mode, and surge current is conducted away.
S520: the surge voltage disappears and the process returns to step 530.
According to the voltage adjusting method of the surge protection circuit, the surge energy is conducted away from the ground, and damage of the surge to the integrated circuit is avoided.
Optionally, an electronic device is further provided in this embodiment of the present application, as shown in fig. 6, the terminal device may include a processor 610, a memory 609, and a program or an instruction stored in the memory 609 and capable of running on the processor 610, where the program or the instruction is executed by the processor 610 to implement each process of the noise reduction method embodiment, and may achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the embodiment of the voltage adjustment method for a surge protection circuit, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the embodiment of the voltage adjustment method for a surge protection circuit, and can achieve the same technical effect, and in order to avoid repetition, the details are not repeated here.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. A surge protection circuit, comprising: the device comprises a first interface, a second interface, a PTVS tube, a voltage detector, a voltage controller and a voltage reducer; wherein the content of the first and second substances,
the cathode of the PTVS tube is electrically connected with the output end of the voltage reducer, the anode of the PTVS tube is electrically connected with the second interface, and the second interface is grounded;
the voltage detector is electrically connected with the first interface and used for detecting a first voltage, and the voltage detector is connected with the voltage controller so as to transmit the first voltage to the voltage controller, wherein the first voltage is the voltage at the first interface and is not greater than a preset threshold value;
the input end of the voltage reducer is electrically connected with the first interface, the output end of the voltage reducer is electrically connected with the PTVS tube, and the control end of the voltage reducer is electrically connected with the voltage controller;
the voltage controller is used for adjusting a second voltage at the output end of the voltage reducer according to the first voltage and a maximum reverse working voltage Vrwm of the PTVS tube, so that the second voltage is close to the maximum reverse working voltage Vrwm.
2. The surge protection circuit of claim 1, wherein the voltage controller is configured to determine a control parameter according to the first voltage and a maximum reverse working voltage Vrwm of the PTVS tube, and adjust the second voltage according to the control parameter.
3. The surge protection circuit of claim 1, wherein the voltage dropper comprises: a field effect transistor, wherein a gate of the field effect transistor is electrically connected to the voltage controller, a drain of the field effect transistor is electrically connected to the first interface, and a source of the field effect transistor is electrically connected to a cathode of the PTVS transistor.
4. The surge protection circuit of claim 1, wherein the voltage dropper comprises: a triode, wherein a base of the triode is electrically connected with the voltage controller, a collector of the triode is electrically connected with the first interface, and an emitter of the triode is electrically connected with a cathode of the PTVS tube.
5. The surge protection circuit of claim 1, wherein the voltage dropper comprises: the voltage controller is respectively electrically connected with the grids of the field effect transistors, the drains of the field effect transistors are electrically connected with the first interface after being connected in parallel, and the sources of the field effect transistors are electrically connected with the cathode of the PTVS after being connected in parallel.
6. The surge protection circuit of claim 1, wherein the voltage dropper comprises: the voltage controller is electrically connected with bases of the triodes respectively, collectors of the triodes are electrically connected with the first interface after being connected in parallel, and emitters of the triodes are electrically connected with cathodes of the PTVS tubes after being connected in parallel.
7. A voltage regulation method of a surge protection circuit, applied to the surge protection circuit of any one of claims 1 to 6, the method comprising:
acquiring the first voltage;
and adjusting the second voltage according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage to enable the second voltage to be close to the maximum reverse working voltage Vrwm.
8. The method of claim 7, wherein adjusting the second voltage to approach the maximum reverse operating voltage Vrwm of the PTVS tube according to the maximum reverse operating voltage Vrwm and the first voltage comprises:
determining a control parameter according to the maximum reverse working voltage Vrwm of the PTVS tube and the first voltage;
and sending the control parameter to the voltage reducer, and adjusting the second voltage by the voltage reducer according to the control parameter.
9. The method of claim 8, further comprising, after sending the control parameter to the pressure reducer:
acquiring the changed first voltage detected by the voltage detector, wherein the changed first voltage is not greater than a preset threshold value;
and updating the control parameter according to the maximum reverse working voltage Vrwm and the changed first voltage, and transmitting the updated control parameter to the voltage reducer to adjust the second voltage so that the second voltage is close to the maximum reverse working voltage Vrwm.
10. The method of claims 7-9, wherein after adjusting the second voltage of the output, the method further comprises:
and acquiring surge voltage input by the first interface, and forbidding updating the control parameter according to the surge voltage so that the second voltage is greater than the maximum reverse working voltage Vrwm, wherein the surge voltage is greater than a preset threshold value.
11. An electronic device characterized by comprising the surge protection circuit according to any one of claims 1 to 6.
12. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the voltage regulation method of the surge protection circuit according to any of claims 7 to 10.
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Citations (6)

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