CN111200274B - Variable threshold overvoltage protection circuit, electronic equipment and method - Google Patents

Variable threshold overvoltage protection circuit, electronic equipment and method Download PDF

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CN111200274B
CN111200274B CN202010041548.6A CN202010041548A CN111200274B CN 111200274 B CN111200274 B CN 111200274B CN 202010041548 A CN202010041548 A CN 202010041548A CN 111200274 B CN111200274 B CN 111200274B
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CN111200274A (en
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王瑞丰
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Shanghai Wingtech Information Technology Co Ltd
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    • 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
    • H02H3/20—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 responsive to excess voltage
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention provides a variable threshold overvoltage protection circuit, electronic equipment and a method. The variable threshold OVP chip in the variable threshold overvoltage protection circuit comprises a voltage input pin, a starting threshold pin, a voltage output pin, an alternating voltage signal detection pin, a clock signal input pin and a data signal input pin; the clock signal input pin is used for connecting a clock signal line to acquire a clock signal; the data signal input pin is used for connecting a data line and acquiring a data signal; the variable threshold OVP chip acquires a corresponding target threshold value through a clock signal and a data signal according to an input voltage input by a voltage input pin so as to enable the target threshold value to be adapted to the input voltage, and the protection effect on a subsequent circuit is improved.

Description

Variable threshold overvoltage protection circuit, electronic equipment and method
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of overvoltage protection, in particular to a variable threshold overvoltage protection circuit, electronic equipment and a method.
[ background ] A method for producing a semiconductor device
In order to ensure the safety of the mobile phone in the charging process, an OVP (overvoltage protection) chip is usually added at the charging input end to protect a subsequent circuit, and when the OVP chip detects that the input voltage is higher than a set starting threshold value, the OVP chip immediately turns off the charging circuit to prevent the voltage from being output and protect a subsequent circuit. In the conventional OVP chip, the starting threshold value is calculated by a pull-up resistor and a pull-down resistor, cannot be changed after being set, and is only suitable for conventional fixed voltage charging (such as 5V/2A charging).
After the rapid charging scheme is started, the charging voltage is continuously adjusted during the charging process, and the conventional OVP can only fixedly set the starting threshold value to a voltage value higher than the highest input voltage. For example, in the QC3.0 scheme, the input voltage varies from 5V to 9V, and since the existing OVP has only one fixed reference voltage of 1.2V, the subsequent circuit can be protected only by setting the start threshold to a voltage value higher than 9V (e.g., 10.8V), but if the start threshold is set too high, the protection effect on the subsequent circuit is deteriorated.
In view of the foregoing, it is desirable to provide a variable threshold over-voltage protection circuit, an electronic device and a method thereof to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide a variable threshold overvoltage protection circuit, electronic equipment and a method, which can improve the protection effect of a subsequent circuit in a quick charging process.
In order to achieve the above object, the present invention provides a variable threshold overvoltage protection circuit, which includes a variable threshold OVP chip, an input capacitor, a first resistor, a second resistor, and an output capacitor; the variable threshold OVP chip comprises a voltage input pin, a starting threshold pin, a voltage output pin, an alternating voltage signal detection pin, a clock signal input pin and a data signal input pin; the voltage input pin is respectively connected with a first end of the first resistor and a first end of the input capacitor, and a second end of the input capacitor is grounded; the starting threshold pin is respectively connected with the second end of the first resistor and the first end of the second resistor, and the second end of the second resistor is grounded; the voltage output pin is connected with the first end of the output capacitor, and the second end of the output capacitor is grounded; the clock signal input pin is used for connecting a clock signal line to acquire a clock signal; the data signal input pin is used for connecting a data line and acquiring a data signal; and the variable threshold OVP chip acquires a corresponding target threshold value through the clock signal and the data signal according to the input voltage input by the voltage input pin.
In a preferred embodiment, the variable threshold OVP chip writes the data signal based on the clock signal, obtains a target reference voltage corresponding to the data signal, and outputs the target reference voltage through the start threshold pin; and calculating the target reference voltage through a preset threshold value calculation formula to obtain a corresponding target threshold value.
In a preferred embodiment, an input voltage detection module, an OVP enable switch detection module, an operational amplifier, a logic control module and a first MOS transistor are arranged in the variable threshold OVP chip; the OVP enabling switch detection module is used for acquiring a charging state; when the charging state is a quick charging state, the OVP enabling switch detection module selects the variable reference voltage control module to obtain a target reference voltage; the input voltage detection module is used for detecting input voltage and sending the input voltage to the operational amplifier; the operational amplifier compares the input voltage with the target reference voltage to obtain a comparison result and sends the comparison result to the logic control module; and the logic control module controls whether the first MOS tube is conducted or not according to the comparison result.
In a preferred embodiment, the OVP enable switch detection module selects the variable reference voltage control module; the input voltage detection module is used for acquiring n input voltages according to a preset frequency, acquiring a corresponding input voltage range according to a first input voltage, and when the remaining n-1 input voltages are also in the input voltage range, sending the input voltage range to the variable reference voltage control module, wherein n is more than or equal to 2; and the variable reference voltage control module inquires a preset adjustable reference voltmeter according to the input voltage range and configures the target reference voltage according to the written data signal.
In a preferred embodiment, the variable threshold overvoltage protection circuit further comprises a controller; the controller is connected with the alternating voltage signal detection pin; in the logic control module, after controlling whether the first MOS transistor is turned on according to the comparison result, the variable threshold overvoltage protection circuit further includes: and the first MOS tube sends the corresponding D pole level to the controller through the alternating voltage signal detection pin.
In a preferred embodiment, a charge pump, a second MOS transistor and a diode are further disposed in the variable threshold OVP chip; the charge pump is connected with the G pole of the second MOS tube, the S pole of the second MOS tube is respectively connected with the voltage output pin and the anode of the diode, and the D pole of the second MOS tube is connected with the cathode of the diode.
In a preferred embodiment, the charge pump controls whether the second MOS transistor is turned on according to a high-low level sent by the logic control module, so that the voltage output pin outputs a voltage.
In a preferred embodiment, the variable threshold overvoltage protection circuit further comprises a pull-up resistor; and the first end of the pull-up resistor is connected with the alternating voltage signal detection pin, and the second end of the pull-up resistor is connected with the voltage supply end.
The invention further provides an electronic device comprising the variable threshold overvoltage protection circuit in any one of the above embodiments.
The invention also provides a variable threshold overvoltage protection method, which comprises the following steps: the OVP enabling switch detection module detects whether the charging state is a QC quick-charging state; if the charging state is the QC quick charging state, starting the variable reference voltage control module; the variable reference voltage control module acquires n input voltages according to a preset frequency, acquires a corresponding input voltage range according to a first input voltage, inquires a preset adjustable reference voltmeter according to the input voltage range when the remaining input voltage is also in the input voltage range, and configures a target reference voltage through a clock signal and a data signal; and calculating the target reference voltage through a preset threshold value calculation formula to obtain a corresponding target threshold value.
Compared with the prior art, the variable threshold overvoltage protection circuit provided by the invention has the advantages that the input voltage is obtained through the voltage input pin on the OVP chip, the voltage change interval of the input voltage is determined according to the input voltage, and then the voltage change interval is determined through I2And C, configuring a target reference voltage by the clock signal input pin and the data signal input pin so as to adjust the target reference voltage according to the voltage change interval corresponding to the input voltage, so that different input voltages correspond to different starting threshold values, and the protection effect of a subsequent circuit is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a circuit diagram of a variable threshold overvoltage protection circuit provided by the present invention;
FIG. 2 is a schematic diagram of a variable threshold OVP chip in the variable threshold overvoltage protection circuit;
fig. 3 is a flow chart of a variable threshold over-voltage protection method.
[ detailed description ] A
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in fig. 1, fig. 1 is a circuit diagram 100 of the variable threshold overvoltage protection circuit provided by the present invention. The variable threshold overvoltage protection circuit 100 provided by the invention comprises a variable threshold OVP chip U1, an input capacitor C1, a first resistor R1, a first resistor R2 and an output capacitor C2.
The variable threshold OVP chip U1 includes a voltage input pin IN, a start threshold pin OVLO, a voltage output pin OUT, an ac voltage signal detection pin ACOK, a clock signal input pin CLK, and a DATA signal input pin DATA.
The voltage input pin IN is respectively connected with the first end of the first resistor R1 and the first end of the input capacitor C1, and the second end of the input capacitor C1 is grounded; the starting threshold pin OVLO is respectively connected with the second end of the first resistor R1 and the first end of the first resistor R2, and the second end of the first resistor R2 is grounded; the voltage output pin OUT is connected to a first terminal of an output capacitor C2, and a second terminal of the output capacitor C2 is grounded.
The clock signal input pin is used for connecting a clock signal line to acquire a clock signal; the data signal input pin is used for connecting a data line and acquiring a data signal;
the variable threshold OVP chip obtains a corresponding target threshold value through a clock signal and a data signal according to the input voltage input by the voltage input pin.
Wherein, the variable threshold OVP chip refers to an OVP chip which can adjust the starting threshold value. The adjustable threshold OVP chip U1 IN this embodiment includes a voltage input pin IN, a start threshold pin OVLO, a voltage output pin OUT, an ac voltage signal detection pin ACOK, a clock signal input pin CLK, and a DATA signal input pin DATA. A clock signal input pin CLK for connecting I2A clock signal line in C; DATA signal input pin DATA for connection I2And C, data lines. The clock signal input pin CLK and the DATA signal input pin DATA are arranged on the variable threshold OVP chip U1 to realize the adjustment of the reference voltage, so that the adjustment of the starting threshold value is realized to improve the protection effect of the subsequent circuit.
Specifically, after the variable threshold overvoltage protection circuit obtains an input voltage through a voltage input end, the input voltage is divided by a first resistor R1 and a first resistor R2, the divided voltage is compared with a corresponding target threshold value by starting a threshold pin OVLO, and if the divided voltage exceeds the target threshold value, the OVP turns off a subsequent circuit. The target threshold value refers to a starting threshold value corresponding to an input voltage range, and the input voltage range refers to a preset voltage range corresponding to the input voltage. The target threshold value is made to be adaptive to the input voltage by selecting the target threshold value and comparing the target threshold value with the input voltage, so that the protection effect on a subsequent circuit is improved.
Preferably, the OVP chip U1 writes the data signal based on the clock signal, obtains a target reference voltage corresponding to the data signal, and outputs the target reference voltage through the start threshold pin OVLO.
Specifically, when a rising edge or a falling edge of the clock signal comes, the corresponding data signal is written, and it is generally set that when a rising edge of the clock signal comes, the corresponding data signal is written. After the data signal is written, the OVP chip U1 takes the voltage value indicated by the data signal as the target reference voltage. The data signal refers to a preset digital signal of a reference voltage value corresponding to an input voltage range. In this embodiment, each input voltage range corresponds to a reference voltage value. The target reference voltage refers to a preset reference voltage corresponding to the input voltage range. If the input voltage is 5.2V, the corresponding voltage range is 5V to 6V, and the target reference voltage corresponding to the voltage range is 1.38V.
And calculating the target reference voltage through a threshold value calculation formula to obtain a target threshold value.
Specifically, the threshold value is calculated by the formula
Figure BDA0002367937170000071
Wherein, VovloIndicates a target threshold value, VldoRepresenting the target reference voltage. The protection effect on a subsequent circuit is improved by obtaining the voltage which enables the starting threshold value to be adaptive to the divided voltage.
In an embodiment, as shown in fig. 2, an input voltage detection module, an OVP enable switch detection module, an operational amplifier, a variable reference voltage control module, a logic control module, and a first MOS transistor Q1 are disposed in the variable threshold OVP chip U1.
And the OVP enables the switch detection module to acquire the charging state.
The charge state in this embodiment refers to a QC quick charge state.
And when the charging state is the quick charging state, the OVP enabling switch detection module selects the variable reference voltage control module to obtain the target reference voltage.
The OVP enabling switch detection module is used for selectively switching off an operation module of a fixed reference voltage arranged in a variable threshold OVP chip U1 according to the quick charging state and starting the variable reference voltage control module. The variable reference voltage control module refers to a module in which the reference voltage can be adjusted.
Specifically, after the OVP enabling switch detection module detects that the charging state is the QC fast charging state, the OVP enabling switch detection module turns off the running module of the fixed reference voltage, and starts the variable reference voltage control module to obtain the target reference voltage.
And the input voltage detection module is used for detecting the input voltage and sending the input voltage to the operational amplifier.
Specifically, the variable threshold OVP chip is further provided with a high-voltage surge clamping module, a third resistor R3 and a fourth resistor R4 at a voltage input end. One end of the high-voltage surge clamping module is connected to the first end of the third resistor R3, and the other end of the high-voltage surge clamping module is grounded. The input voltage detection module is respectively connected with the second end of the third resistor R3 and the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded. And the high-voltage surge clamping module is used for carrying out high-voltage filtering on the input voltage, and after the input voltage is subjected to high-voltage filtering through the high-voltage surge clamping module, the filtered voltage is divided by the third resistor R3 and the fourth resistor R4 and then is input into the input voltage detection module.
The operational amplifier compares the input voltage with the target reference voltage to obtain a comparison result, and sends the comparison result to the logic control module.
And the logic control module controls whether the first MOS tube Q1 is conducted or not according to the comparison result.
Specifically, when the input voltage is higher than the target reference voltage, the logic control module controls the first MOS transistor Q1 to be non-conductive; when the input voltage is not higher than the target reference voltage, the logic control module controls the first MOS transistor Q1 to be turned on.
Preferably, the OVP enabling switch detection module selects the variable reference voltage control module to obtain the target reference voltage, and includes:
the OVP enable switch detect module selects the variable reference voltage control module.
The input voltage detection module is used for acquiring n input voltages according to a preset frequency, acquiring a corresponding input voltage range according to a first input voltage, and when the remaining n-1 input voltages are also in the input voltage range, transmitting the input voltage range to the variable reference voltage control module, wherein n is larger than or equal to 2.
If the preset frequency is 2S to obtain the primary input voltage, and n is 3, obtaining the primary input voltage every 2S to obtain 3 input voltage values which are 5.2V, 5.2V and 5.4V respectively, determining that the input voltage range corresponding to the input voltage is 5-6V according to the 5.2V, and if the 5.2V and the 5.4V are also within the input voltage range of 5-6V, sending the input voltage range of 5-6V to the variable reference voltage control module.
And the variable reference voltage control module inquires the adjustable reference voltmeter according to the input voltage range and configures the target reference voltage through the written data signal.
The adjustable reference voltage table is a table for reflecting the mapping relation between the input voltage range and the target reference voltage.
Specifically, after the variable reference voltage control module obtains the input voltage range, the target reference voltage is configured according to the input voltage range through the written data signal.
Preferably, the variable threshold overvoltage protection circuit further comprises a controller; the controller is connected to the ac voltage signal detection pin ACOK.
After the logic control module controls whether the first MOS transistor Q1 conducts according to the comparison result, the variable threshold overvoltage protection circuit further includes:
the D-pole level of the first MOS transistor Q1 is sent to the controller through the ac voltage signal detection pin ACOK.
Preferably, a charge pump, a second MOS transistor Q2 and a diode are further arranged in the variable threshold OVP chip U1; the charge pump is connected with the G pole of the second MOS tube Q2, the S pole of the second MOS tube Q2 is respectively connected with the voltage output pin OUT and the anode of the diode, and the D pole of the second MOS tube Q2 is connected with the cathode of the diode.
Preferably, the charge pump controls whether the second MOS transistor Q2 is turned on according to the high-low level sent by the logic control module, so that the voltage output pin OUT outputs the target threshold value.
As shown in fig. 1, the variable threshold overvoltage protection circuit further includes a pull-up resistor R3.
A first terminal of the pull-up resistor R3 is connected to the ac voltage signal detection pin ACOK, and a second terminal of the pull-up resistor R3 is connected to the voltage supply terminal.
Specifically, a pull-up resistor R3 is connected to the ac voltage signal detection pin ACOK, so that the ac voltage signal detection pin ACOK can maintain a certain logic level even when an external component is not connected.
The variable threshold overvoltage protection circuit provided by the invention detects whether the charging state is a QC quick-charging state or not through the OVP enabling switch detection module, and starts the variable reference voltage control module if the charging state is the QC quick-charging state. The variable reference voltage control module acquires n input voltages according to the preset frequency, acquires a corresponding input voltage range according to the first input voltage, inquires an adjustable reference voltmeter according to the input voltage range when the remaining n-1 input voltages are also in the input voltage range, and acquires I through a clock signal input pin CLK arranged on the variable threshold OVP chip2And C, acquiring a DATA signal from a clock signal and a DATA signal input pin DATA so that the variable threshold OVP chip configures a target reference voltage according to the clock signal and the DATA signal to adapt the target reference voltage to the input voltage.
After the target reference voltage is obtained, the corresponding target threshold value is obtained according to the threshold value calculation formula, and the target threshold value is adapted to the input voltage, so that the protection effect on a subsequent circuit can be effectively improved.
The present invention also provides an electronic device comprising the variable threshold overvoltage protection circuit 100 in any one of the above embodiments. Specifically, the electronic device may be, for example, a smartphone.
The invention also provides a variable threshold overvoltage protection method, which comprises the following steps:
s10: and the OVP enabling switch detection module detects whether the charging state is a QC quick-charging state.
S20: and if the charging state is the QC quick charging state, starting the variable reference voltage control module.
S30: the variable reference voltage control module acquires n input voltages according to the preset frequency, acquires a corresponding input voltage range according to the first input voltage, inquires a preset adjustable reference voltmeter according to the input voltage range when the remaining input voltage is also in the input voltage range, and configures a target reference voltage through a clock signal and a data signal.
S40: and calculating the target reference voltage through a preset threshold value calculation formula to obtain a corresponding target threshold value.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. A variable threshold overvoltage protection circuit is characterized by comprising a variable threshold OVP chip, an input capacitor, a first resistor, a second resistor and an output capacitor;
the variable threshold OVP chip comprises a voltage input pin, a starting threshold pin, a voltage output pin, an alternating voltage signal detection pin, a clock signal input pin and a data signal input pin;
the voltage input pin is respectively connected with a first end of the first resistor and a first end of the input capacitor, and a second end of the input capacitor is grounded; the starting threshold pin is respectively connected with the second end of the first resistor and the first end of the second resistor, and the second end of the second resistor is grounded; the voltage output pin is connected with the first end of the output capacitor, and the second end of the output capacitor is grounded;
the clock signal input pin is used for connecting a clock signal line to acquire a clock signal; the data signal input pin is used for connecting a data line and acquiring a data signal;
an input voltage detection module, an OVP enable switch detection module, an operational amplifier, a variable reference voltage control module, a logic control module and a first MOS tube are arranged in the variable threshold OVP chip;
the OVP enabling switch detection module is used for acquiring a charging state;
when the charging state is a quick charging state, the OVP enabling switch detection module selects the variable reference voltage control module;
the variable reference voltage control module is used for acquiring n input voltages according to a preset frequency, acquiring a corresponding input voltage range according to a first input voltage, sending the input voltage range to the variable reference voltage control module when the remaining n-1 input voltages are also in the input voltage range, wherein n is more than or equal to 2, inquiring a preset adjustable reference voltage meter according to the input voltage range, and configuring a target reference voltage through the written data signal;
the input voltage detection module is used for detecting a divided voltage which is input to the starting threshold pin after the input voltage of the voltage input pin is divided by the first resistor and the second resistor, and sending the divided voltage to the operational amplifier;
the operational amplifier compares the divided voltage with the target reference voltage to obtain a comparison result and sends the comparison result to the logic control module;
and the logic control module controls whether the first MOS tube is conducted or not according to the comparison result.
2. The variable threshold overvoltage protection circuit of claim 1, wherein said variable threshold overvoltage protection circuit further comprises a controller; the controller is connected with the alternating voltage signal detection pin;
after the logic control module controls whether the first MOS tube is conducted or not according to the comparison result,
and the first MOS tube sends the corresponding D pole level to the controller through the alternating voltage signal detection pin.
3. The variable threshold overvoltage protection circuit according to claim 1, wherein a charge pump, a second MOS transistor and a diode are further disposed in the variable threshold OVP chip; the charge pump is connected with the G pole of the second MOS tube, the S pole of the second MOS tube is respectively connected with the voltage output pin and the anode of the diode, and the D pole of the second MOS tube is connected with the cathode of the diode.
4. The variable threshold overvoltage protection circuit of claim 3,
and the charge pump controls whether the second MOS tube is conducted or not according to the high and low levels sent by the logic control module so that the voltage output pin outputs voltage.
5. The variable threshold overvoltage protection circuit of claim 1, wherein said variable threshold overvoltage protection circuit further comprises a pull-up resistor;
and the first end of the pull-up resistor is connected with the alternating voltage signal detection pin, and the second end of the pull-up resistor is connected with the voltage supply end.
6. An electronic device comprising a variable threshold overvoltage protection circuit as claimed in any one of claims 1 to 5.
7. A variable threshold overvoltage protection method based on the variable threshold overvoltage protection circuit according to any one of claims 1 to 5, comprising:
the OVP enabling switch detection module detects whether the charging state is a QC quick-charging state;
if the charging state is the QC quick charging state, starting the variable reference voltage control module;
the variable reference voltage control module acquires n input voltages according to a preset frequency, acquires a corresponding input voltage range according to a first input voltage, inquires a preset adjustable reference voltmeter according to the input voltage range when the remaining n-1 input voltages are also in the input voltage range, wherein n is more than or equal to 2, and configures a target reference voltage through a clock signal and a data signal;
the input voltage detection module detects the divided voltage input to the starting threshold pin after the input voltage of the voltage input pin is divided by the first resistor and the second resistor, and sends the divided voltage to the operational amplifier;
the operational amplifier compares the divided voltage with the target reference voltage to obtain a comparison result and sends the comparison result to a logic control module;
and the logic control module controls whether the first MOS tube is conducted or not according to the comparison result.
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