Voltage protection circuit based on double-threshold judgment and electronic equipment
By using a voltage protection circuit based on dual threshold judgment, and utilizing a switch control module and a circuit on/off control module, the problems of complexity and poor flexibility in traditional circuit design are solved. This enables the equipment to operate within a safe power supply range and automatically shut down, thereby improving the safety and stability of the equipment.
Patent Information
- Application Number
- CN202422635921.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Traditional dual-threshold circuit designs are complex, resulting in high circuit costs, poor flexibility, and difficulty in meeting diverse application needs. Furthermore, the operating equipment is prone to damage when the power supply is unstable.
A voltage protection circuit based on dual threshold judgment is adopted. Through the switch control module and the circuit on/off control module, discrete components are used to achieve circuit flexibility, ensure that the equipment operates within the safe power supply range, and automatically cut off the power when the power supply voltage is too low.
It improves the safety and stability of operating equipment, reduces chip damage and performance degradation caused by insufficient power supply, and enhances the flexibility and reliability of circuits.
Smart Images
Figure CN223502557U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of voltage protection circuit technology, and in particular to a voltage protection circuit and electronic device based on dual threshold determination. Background Technology
[0002] In the current field of electronic technology, dual-threshold circuits are widely used in various electronic devices to achieve high efficiency and low power consumption while providing voltage protection for the operating modules. Traditional dual-threshold circuits are typically composed of logic gates, with their structures often derived from RS latches. However, practical experience has shown that this circuit design relies on complex logic gate combinations, increasing not only the complexity and design difficulty of the circuit but also leading to higher manufacturing costs. Furthermore, because the logic gate combinations are relatively fixed, the flexibility and scalability of the circuit are easily limited, making it difficult to meet diverse application requirements. Therefore, proposing a new voltage protection technology to achieve operational stability in electronic devices is particularly important. Utility Model Content
[0003] In view of this, the problem to be solved by this utility model is to provide a voltage protection circuit based on dual threshold judgment, which not only realizes the flexibility of circuit construction, but also enables the operating equipment to operate within a safe power supply range and automatically cuts off power when the power supply voltage is too low, thereby improving the safety and stability of the operating equipment.
[0004] To address the aforementioned technical problems, the first aspect of this utility model discloses a voltage protection circuit based on dual threshold determination. The voltage protection circuit includes a switch control module 101 and a circuit on / off control module 102, wherein:
[0005] The input terminal of the switch control module 101 is used to electrically connect to the output terminal of the voltage output device 103. The control terminal of the switch control module 101 is electrically connected to the controlled terminal of the circuit on / off control module 102. The output terminal of the switch control module 101 is electrically connected to the input terminal of the circuit on / off control module 102 and the voltage terminal of the operating device 104. The grounding terminal of the circuit on / off control module 102 is used for grounding.
[0006] The switch control module 101 is used to be in a conducting state when the output voltage value of the voltage output device 103 is greater than or equal to a preset first voltage threshold, so as to make the first target path in the path on / off control module 102 conduct, and to supply power to the operating device 104 through the conducted first target path.
[0007] The path on / off control module 102 is used to disconnect the second target path contained therein when the operating device 104 is in a powered state and the output voltage value of the voltage output device 103 is less than the first voltage threshold, and to control the switch control module 101 to disconnect, so as to perform a power-off operation on the operating device 104.
[0008] As an optional implementation, in the first aspect of this utility model, the circuit on / off control module 102 includes a first circuit on / off control device, a second circuit on / off control device, and a switch control device, wherein:
[0009] The controlled terminal of the first path on / off control device is electrically connected to the control terminal of the switch control module 101. The input terminal of the second path on / off control device is electrically connected to the output terminal of the switch control module 101. The control terminal of the second path on / off control device is electrically connected to the controlled terminal of the switch control device and is used for grounding. The input terminal of the switch control device is electrically connected to the control terminal of the switch control module 101. The grounding terminal of the first path on / off control device and the grounding terminal of the switch control device are both used for grounding.
[0010] As an optional implementation, in the first aspect of this utility model, the switch control module 101 is specifically used for:
[0011] When the output voltage value of the voltage output device 103 is greater than or equal to a preset first voltage threshold and less than a preset second voltage threshold, it is in a conducting state so that it is connected to the first path where the switch control device is located, and the operating device 104 is powered through the connected first path; the second voltage threshold is greater than the first voltage threshold.
[0012] When the output voltage of the voltage output device 103 is greater than or equal to the second voltage threshold, it is in a conducting state, so that it is connected to the second path where the first path on / off control device is located, and to the third path where the second path on / off control device and the switch control device are located, and to supply power to the operating device 104 through the connected second path and the third path.
[0013] As an optional implementation, in the first aspect of this utility model, the second path on / off control device is used to be in an off state when the operating device 104 is in a powered state and when the output voltage value of the voltage output device 103 is less than the first voltage threshold, so as to disconnect the switch control device.
[0014] The first path on / off control device is used to be in an off state when the switch control device is off, so as to control the switch control module 101 to be off and to perform a power-off operation on the operating device 104.
[0015] As an optional implementation, in the first aspect of this utility model, the switch control module 101 includes a PNP transistor Q1, wherein:
[0016] The emitter of the PNP transistor Q1 is electrically connected to the output terminal of the voltage output device 103, the base of the PNP transistor Q1 is electrically connected to the controlled terminal of the first path on / off control device and the input terminal of the switch control device, and the collector of the PNP transistor Q1 is electrically connected to the input terminal of the second path on / off control device and the voltage terminal for electrically connecting the operating device 104.
[0017] As an optional implementation, in the first aspect of this invention, the switching control device includes an NPN transistor Q2, wherein:
[0018] The base of the NPN transistor Q2 is electrically connected to the control terminal of the second path on / off control device, the collector of the NPN transistor Q2 is electrically connected to the base of the PNP transistor Q1, and the emitter of the NPN transistor Q2 is grounded.
[0019] As an optional implementation, in the first aspect of this utility model, the first path on / off control device includes a first Zener diode D1, wherein:
[0020] The negative terminal of the first Zener diode D1 is electrically connected to the base of the PNP transistor Q1, and the positive terminal of the first Zener diode D1 is used for grounding;
[0021] The second path on / off control device includes a second Zener diode D2, wherein:
[0022] The negative terminal of the second Zener diode D2 is electrically connected to the collector of the PNP transistor Q1, and the positive terminal of the second Zener diode D2 is electrically connected to the base of the NPN transistor Q2 and grounded.
[0023] As an optional implementation, in the first aspect of this utility model, the circuit on / off control module 102 further includes a first current limiting device R1, a second current limiting device R2, and a pull-down device R3, wherein:
[0024] The first terminal of the first current limiting device R1 is electrically connected to the base of the PNP transistor Q1, and the second terminal of the first current limiting device R1 is electrically connected to the negative terminal of the first Zener diode D1 and the collector of the NPN transistor Q2.
[0025] The first terminal of the second current limiting device R2 is electrically connected to the collector of the PNP transistor Q1, and the second terminal of the second current limiting device R2 is electrically connected to the negative terminal of the second Zener diode D2.
[0026] The first end of the pull-down device R3 is electrically connected to the positive terminal of the second Zener diode D2, and the second end of the pull-down device R3 is used for grounding.
[0027] As an optional implementation, in the first aspect of this utility model, the voltage protection circuit further includes a first filtering module C1 and a second filtering module C2, wherein:
[0028] The first terminal of the first filter module C1 is electrically connected to the emitter of the PNP transistor Q1, and the second terminal of the first filter module C1 is used for grounding;
[0029] The first terminal of the second filter module C2 is electrically connected to the collector of the PNP transistor Q1, and the second terminal of the second filter module C2 is used for grounding.
[0030] The second aspect of this utility model discloses an electronic device, which includes a voltage protection circuit based on dual threshold determination as disclosed in any of the first aspects.
[0031] Implementing this utility model has the following beneficial effects:
[0032] This invention provides a voltage protection circuit based on dual threshold determination. The circuit includes a switch control module and a path on / off control module. The switch control module is used to be in a conducting state when the output voltage value of the voltage output device is greater than or equal to a first voltage threshold, so that the first target path in the path on / off control module is turned on and supplies power to the operating device. The path on / off control module is used to be in a disconnected state when the operating device is in a powered state and the output voltage value of the voltage output device is less than the first voltage threshold, and controls the switch control module to disconnect to cut off the power to the operating device. In this way, the voltage protection circuit is built with discrete components, which not only realizes the flexibility of the circuit, but also enables the operating device to operate within a safe power supply range and automatically cuts off the power when the power supply voltage is too low, thereby improving the safety and stability of the operating device. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is a schematic diagram of a voltage protection circuit based on dual threshold determination disclosed in an embodiment of this utility model;
[0035] Figure 2 This is a schematic diagram of another voltage protection circuit based on dual threshold determination disclosed in an embodiment of this utility model;
[0036] Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this utility model. Detailed Implementation
[0037] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0038] It should be noted that, unless otherwise expressly specified and limited, the term "electrical connection" in the specification, claims, and accompanying drawings of this utility model should be interpreted broadly. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical-electrical connection, or a connection that allows for communication; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements. Furthermore, the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0039] Example 1
[0040] Please see Figure 1 , Figure 1 This is a schematic diagram of a voltage protection circuit based on dual threshold determination disclosed in an embodiment of this utility model. This circuit can be applied to any operating device that requires voltage protection during power supply, such as computers (PDAs, tablets, desktop computers, portable computers, etc.), televisions, smartphones (Android phones, iOS phones, etc.), smartphones, smartwatches, and cameras, etc. This utility model embodiment is not limited to any particular type. Figure 1 As shown, the voltage protection circuit based on dual threshold determination includes a switch control module 101 and a circuit on / off control module 102, wherein:
[0041] The input terminal of the switch control module 101 is used to electrically connect to the output terminal of the voltage output device 103, the control terminal of the switch control module 101 is electrically connected to the controlled terminal of the circuit on / off control module 102, the output terminal of the switch control module 101 is electrically connected to the input terminal of the circuit on / off control module 102 and the voltage terminal of the operating device 104, and the ground terminal of the circuit on / off control module 102 is used for grounding.
[0042] The switch control module 101 is used to be in the conducting state when the output voltage value of the voltage output device 103 is greater than or equal to a preset first voltage threshold, so as to make the first target path in the path on / off control module 102 conduct, and to supply power to the operating device 104 through the conducted first target path.
[0043] The path on / off control module 102 is used to disconnect the second target path contained in the operating device 104 when the operating device 104 is in a powered state and the output voltage value of the voltage output device 103 is less than the first voltage threshold, and control the switch control module 101 to disconnect, so as to perform a power-off operation on the operating device 104.
[0044] In this utility model, it can be understood that when the output voltage value of the voltage output device 103 is greater than or equal to the first voltage threshold, the current power supply voltage of the operating device is adjusted through the first target path so that the operating device 104 operates within a safe voltage range; and when the output voltage value of the voltage output device 103 is less than the first voltage threshold, the operating device 104 is powered off. This can reduce the occurrence of chip damage to the operating device 104 due to insufficient power supply (because if the power supply is unstable, the operating frequency and performance of the operating device will be limited, the operating speed will decrease significantly and cannot reach the normal level, resulting in a decrease in the overall performance of the operating device; and the current may fluctuate or become unstable, which will cause damage to the internal components of the operating device and may cause the operating device to suddenly collapse), thereby improving the protection and safety of the operating device 104.
[0045] Optionally, the switch control module 101 may include a PNP transistor, or other control modules capable of achieving equivalent switch control.
[0046] It is evident that implementation Figure 1 The voltage protection circuit based on dual threshold determination described herein, constructed using discrete components, not only achieves circuit flexibility but also enables the operating equipment to operate within a safe power supply range and automatically cuts off power when the power supply voltage is too low, thereby improving the safety and stability of the operating equipment.
[0047] In an optional embodiment, such as Figure 2 As shown, Figure 2 This is a schematic diagram of another voltage protection circuit based on dual threshold determination disclosed in an embodiment of this utility model, wherein:
[0048] The circuit on / off control module 102 includes a first circuit on / off control device, a second circuit on / off control device, and a switch control device, wherein:
[0049] The controlled terminal of the first path on / off control device is electrically connected to the control terminal of the switch control module 101. The input terminal of the second path on / off control device is electrically connected to the output terminal of the switch control module 101. The control terminal of the second path on / off control device is electrically connected to the controlled terminal of the switch control device and is used for grounding. The input terminal of the switch control device is electrically connected to the control terminal of the switch control module 101. The grounding terminal of the first path on / off control device and the grounding terminal of the switch control device are both used for grounding.
[0050] Furthermore, the switch control module 101 is specifically used for:
[0051] When the output voltage value of the voltage output device 103 is greater than or equal to the preset first voltage threshold and less than the preset second voltage threshold, it is in the conducting state so that it is connected to the first path where the switch controller is located, and supplies power to the operating device 104 through the connected first path; the second voltage threshold is greater than the first voltage threshold.
[0052] When the output voltage value of the voltage output device 103 is greater than or equal to the second voltage threshold, it is in the conducting state so that it is connected to the second path where the first path on / off control device is located, and to the third path where the second path on / off control device and the switch control device are located, and to supply power to the operating device 104 through the connected second path and the third path.
[0053] And, the second path on / off control device is used to be in the off state when the operating device 104 is in the powered state and when the output voltage value of the voltage output device 103 is less than the first voltage threshold, so as to disconnect the switch control device.
[0054] The first path on / off control device is used to be in the off state when the switch control device is off, so as to control the switch control module 101 to disconnect and perform a power-off operation on the operating equipment 104.
[0055] In this optional embodiment, the on-state voltage of the first path on / off control device is greater than the on-state voltage of the second path on / off control device.
[0056] Furthermore, the switch control module 101 includes a PNP transistor Q1, wherein:
[0057] The emitter of PNP transistor Q1 is used to electrically connect to the output terminal of voltage output device 103, the base of PNP transistor Q1 is electrically connected to the controlled terminal of the first path on / off control device and the input terminal of the switch control device, and the collector of PNP transistor Q1 is electrically connected to the input terminal of the second path on / off control device and the voltage terminal used to electrically connect to operating device 104.
[0058] Furthermore, the switching control device includes an NPN transistor Q2, wherein:
[0059] The base of NPN transistor Q2 is electrically connected to the control terminal of the second path on / off control device, the collector of NPN transistor Q2 is electrically connected to the base of PNP transistor Q1, and the emitter of NPN transistor Q2 is used for grounding.
[0060] Furthermore, the first path on / off control device includes a first Zener diode D1, wherein:
[0061] The negative terminal of the first Zener diode D1 is electrically connected to the base of the PNP transistor Q1, and the positive terminal of the first Zener diode D1 is used for grounding.
[0062] The second path on / off control device includes a second Zener diode D2, wherein:
[0063] The negative terminal of the second Zener diode D2 is electrically connected to the collector of the PNP transistor Q1, and the positive terminal of the second Zener diode D2 is electrically connected to the base of the NPN transistor Q2 and is used for grounding.
[0064] In this optional embodiment, the forward voltage of the first Zener diode D1 is greater than the forward voltage of the second Zener diode D2. It should be noted that during initial power-on, if the output voltage of the voltage output device 103 is less than the second voltage threshold, the first Zener diode D1 will not operate. Consequently, the PNP transistor Q1 will have no base current and will not conduct. The operating device 104 will receive a power supply voltage of 0V and will be in a power-off state. Therefore, during initial power-on, the output voltage of the voltage output device 103 needs to be higher than or equal to the second voltage threshold for the PNP transistor Q1 to conduct, thus enabling the operating device 104 to successfully power on. Subsequently, during the power supply process, the power supply voltage is adjusted based on the fluctuating output voltage value.
[0065] Optionally, the switching control device may include, in addition to the NPN transistor Q2, other control devices capable of achieving equivalent switching control; the first path on / off control device may include, in addition to the first Zener diode D1, other control devices capable of achieving equivalent path on / off control; and the second path on / off control device may include, in addition to the second Zener diode D2, other control devices capable of achieving equivalent path on / off control.
[0066] For example, in running device 104 (such as...) Figure 2 After the MCU in the device is successfully powered on, when the output voltage of the voltage output device 103 is greater than or equal to the second voltage threshold (e.g., Vin≥aV+0.7V, where aV is the conduction voltage of the first Zener diode D1), the PNP transistor Q1 is turned on (current flows through its base), and then the Zener diode D1 breaks down and is in the conducting state; at the same time, since the conduction voltage of the first Zener diode D1 is greater than the conduction voltage of the second Zener diode D2, the second Zener diode D2 is also broken down by Zener and is in the conducting state, and current flows through the base of the NPN transistor Q2, which is also in the conducting state (at this time, the voltage of the first Zener diode D1 is clamped by the Uce of the NPN transistor Q2), so that the operating device 104 is powered through the current paths: Vin→Q1→D1→GND and Vin→Q1→D2→Q2→GND, so that Vout≈Vin≈aV+0.7V;
[0067] When the output voltage of the voltage output device 103 is greater than or equal to the first voltage threshold and less than the second voltage threshold (e.g., bV+0.7V≤Vin<aV+0.7V, where bV is the conduction voltage of the second Zener diode D2), the PNP transistor Q1, the second Zener diode D2, and the NPN transistor Q2 are still in the conducting state, while the first Zener diode D1 is in the off state. Thus, the operating device 104 is powered through the current path: Vin→Q1→Q2→GND, so that Vout≈Vin.
[0068] When the output voltage of voltage output device 103 is less than the first voltage threshold (e.g., Vin < bV + 0.7V), the second Zener diode D2 is turned off, and consequently, no current flows through the base of NPN transistor Q2, which is in an open state. Since NPN transistor Q2 is open, the first Zener diode D1 is not clamped by the Uce of NPN transistor Q2. Furthermore, because the forward voltage of the first Zener diode D1 is greater than the forward voltage of the second Zener diode D2, the first Zener diode D1 is also turned off. No current flows through the base of PNP transistor Q1, which is in an open state, resulting in Vout being 0V and no longer supplying power to operating device 104. Only when Vin is again greater than the second voltage threshold can PNP transistor Q1 be turned on to continue supplying power to operating device 104, thus ensuring that the operating voltage of operating device 104 is always not less than the first voltage threshold and reducing various hazards caused by insufficient power supply.
[0069] It is evident that implementation Figure 2The voltage protection circuit based on dual threshold judgment described herein can flexibly adapt to voltage fluctuations of the output device within different voltage ranges by using a combination of transistors and Zener diodes, ensuring that the operating device operates stably within a safe voltage range: when the output voltage is greater than or equal to the first voltage threshold, the circuit provides stable power supply to the operating device through optimized path configuration; and when the output voltage is lower than the first voltage threshold, the circuit quickly cuts off the power supply, effectively reducing the damage to the operating device caused by insufficient power supply, and improving the reliability and stability of the operating device.
[0070] In another alternative embodiment, such as Figure 2 As shown, the on / off control module 102 also includes a first current limiting device R1, a second current limiting device R2, and a pull-down device R3, wherein:
[0071] The first terminal of the first current limiting device R1 is electrically connected to the base of the PNP transistor Q1, and the second terminal of the first current limiting device R1 is electrically connected to the negative terminal of the first Zener diode D1 and the collector of the NPN transistor Q2.
[0072] The first terminal of the second current limiting device R2 is electrically connected to the collector of the PNP transistor Q1, and the second terminal of the second current limiting device R2 is electrically connected to the negative terminal of the second Zener diode D2.
[0073] The first terminal of the pull-down device R3 is electrically connected to the positive terminal of the second Zener diode D2, and the second terminal of the pull-down device R3 is used for grounding.
[0074] In this invention, optionally, the first current limiting device R1, the second current limiting device R2, and the pull-down device R3 may each include a single resistor, or multiple resistors connected in series, or multiple resistors connected in parallel.
[0075] It is evident that implementation Figure 2 The voltage protection circuit based on dual threshold determination described herein can effectively limit the current flowing through the relevant transistors and Zener diodes by introducing a first current limiting device and a second current limiting device, thereby reducing the occurrence of component damage caused by excessive current and enhancing the stability and reliability of the entire circuit. At the same time, by introducing a pull-down device, the influence of interference signals on the circuit is reduced, improving the circuit's anti-interference capability and stability.
[0076] In yet another alternative embodiment, such as Figure 2 As shown, the voltage protection circuit also includes a first filter module C1 and a second filter module C2, wherein:
[0077] The first terminal of the first filter module C1 is electrically connected to the emitter of the PNP transistor Q1, and the second terminal of the first filter module C1 is used for grounding;
[0078] The first terminal of the second filter module C2 is electrically connected to the collector of the PNP transistor Q1, and the second terminal of the second filter module C2 is used for grounding.
[0079] In this utility model, optionally, the first filtering module C1 and the second filtering module C2 may each include a single filtering capacitor, or multiple filtering capacitors connected in parallel, or other modules capable of achieving the same filtering function.
[0080] It is evident that implementation Figure 2 The voltage protection circuit based on dual threshold judgment described herein can effectively reduce the fluctuation of electrical signals in the circuit by introducing a filtering module, ensuring the accuracy and integrity of signal transmission, thereby extending the service life of components in the circuit and reducing maintenance costs.
[0081] Example 2
[0082] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of the present invention. The electronic device includes any of the voltage protection circuits based on dual threshold determination as described in Embodiment 1. The electronic device includes, but is not limited to, computers (PDAs, tablets, desktop computers, portable computers, etc.), televisions, smartphones (Android phones, iOS phones, etc.), smartphones, smartwatches, and cameras. It should be noted that for a detailed description of the voltage protection circuit based on dual threshold determination, please refer to the specific description in Embodiment 1; this embodiment will not repeat it.
[0083] It is evident that implementation Figure 3 The described electronic device uses a voltage protection circuit built with discrete components, which not only achieves circuit flexibility but also enables the electronic device to operate within a safe power supply range and automatically cut off power when the power supply voltage is too low, thereby improving the safety and stability of the electronic device.
[0084] The present invention has provided a detailed description of a voltage protection circuit and electronic device based on dual threshold determination. Specific embodiments have been used to illustrate the principle and implementation of the present invention. However, the above preferred embodiments are not intended to limit the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of the present invention. At the same time, for those skilled in the art, based on the idea of the present invention, there will be changes in the specific implementation and application scope without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is defined by the scope of the claims.
Claims
1. A voltage protection circuit based on dual threshold determination, characterized in that, The voltage protection circuit includes a switch control module (101) and a circuit on / off control module (102), wherein: The input terminal of the switch control module (101) is used to electrically connect to the output terminal of the voltage output device (103), the control terminal of the switch control module (101) is electrically connected to the controlled terminal of the circuit on / off control module (102), the output terminal of the switch control module (101) is electrically connected to the input terminal of the circuit on / off control module (102) and the voltage terminal of the operating device (104), and the ground terminal of the circuit on / off control module (102) is used for grounding; The switch control module (101) is used to be in a conducting state when the output voltage value of the voltage output device (103) is greater than or equal to a preset first voltage threshold, so as to make the first target path in the path on / off control module (102) conduct, and to supply power to the operating device (104) through the conducted first target path; The path on / off control module (102) is used to disconnect the second target path contained therein when the operating device (104) is in a powered state and the output voltage value of the voltage output device (103) is less than the first voltage threshold, and to control the switch control module (101) to disconnect, so as to perform a power-off operation on the operating device (104).
2. The voltage protection circuit based on dual threshold determination according to claim 1, characterized in that, The circuit on / off control module (102) includes a first circuit on / off control device, a second circuit on / off control device, and a switch control device, wherein: The controlled terminal of the first path switching control device is electrically connected to the control terminal of the switch control module (101), the input terminal of the second path switching control device is electrically connected to the output terminal of the switch control module (101), the control terminal of the second path switching control device is electrically connected to the controlled terminal of the switch control device and is used for grounding, the input terminal of the switch control device is electrically connected to the control terminal of the switch control module (101), and the grounding terminal of the first path switching control device and the grounding terminal of the switch control device are both used for grounding.
3. The voltage protection circuit based on dual threshold determination according to claim 2, characterized in that, The switch control module (101) is specifically used for: When the output voltage value of the voltage output device (103) is greater than or equal to a preset first voltage threshold and less than a preset second voltage threshold, it is in a conducting state so that it is connected to the first path where the switch controller is located, and the operating device (104) is powered through the connected first path; the second voltage threshold is greater than the first voltage threshold; When the output voltage of the voltage output device (103) is greater than or equal to the second voltage threshold, it is in a conducting state, so as to connect with the second path where the first path on / off control device is located, and to connect with the third path where the second path on / off control device and the switch control device are located, and to supply power to the operating device (104) through the connected second path and the third path.
4. The voltage protection circuit based on dual threshold determination according to claim 3, characterized in that, The second path on / off control device is used to be in an off state when the operating device (104) is in a powered state and when the output voltage value of the voltage output device (103) is less than the first voltage threshold, so as to disconnect the switch control device; The first path on / off control device is used to be in an off state when the switch control device is off, so as to control the switch control module (101) to be off and to perform a power-off operation on the operating device (104).
5. The voltage protection circuit based on dual threshold determination according to any one of claims 2-4, characterized in that, The switch control module (101) includes a PNP transistor (Q1), wherein: The emitter of the PNP transistor (Q1) is electrically connected to the output terminal of the voltage output device (103), the base of the PNP transistor (Q1) is electrically connected to the controlled terminal of the first path switching control device and the input terminal of the switch control device, and the collector of the PNP transistor (Q1) is electrically connected to the input terminal of the second path switching control device and the voltage terminal of the operating device (104).
6. The voltage protection circuit based on dual threshold determination according to claim 5, characterized in that, The switching control device includes an NPN transistor (Q2), wherein: The base of the NPN transistor (Q2) is electrically connected to the control terminal of the second path on / off control device, the collector of the NPN transistor (Q2) is electrically connected to the base of the PNP transistor (Q1), and the emitter of the NPN transistor (Q2) is grounded.
7. The voltage protection circuit based on dual threshold determination according to claim 6, characterized in that, The first path on / off control device includes a first Zener diode (D1), wherein: The negative terminal of the first Zener diode (D1) is electrically connected to the base of the PNP transistor (Q1), and the positive terminal of the first Zener diode (D1) is used for grounding; The second path on / off control device includes a second Zener diode (D2), wherein: The negative terminal of the second Zener diode (D2) is electrically connected to the collector of the PNP transistor (Q1), and the positive terminal of the second Zener diode (D2) is electrically connected to the base of the NPN transistor (Q2) and grounded.
8. The voltage protection circuit based on dual threshold determination according to claim 7, characterized in that, The on / off control module (102) further includes a first current limiting device (R1), a second current limiting device (R2), and a pull-down device (R3), wherein: The first terminal of the first current limiting device (R1) is electrically connected to the base of the PNP transistor (Q1), and the second terminal of the first current limiting device (R1) is electrically connected to the negative terminal of the first Zener diode (D1) and the collector of the NPN transistor (Q2). The first terminal of the second current limiting device (R2) is electrically connected to the collector of the PNP transistor (Q1), and the second terminal of the second current limiting device (R2) is electrically connected to the negative terminal of the second Zener diode (D2). The first terminal of the pull-down device (R3) is electrically connected to the positive terminal of the second Zener diode (D2), and the second terminal of the pull-down device (R3) is used for grounding.
9. The voltage protection circuit based on dual threshold determination according to claim 8, characterized in that, The voltage protection circuit further includes a first filter module (C1) and a second filter module (C2), wherein: The first terminal of the first filter module (C1) is electrically connected to the emitter of the PNP transistor (Q1), and the second terminal of the first filter module (C1) is grounded. The first terminal of the second filter module (C2) is electrically connected to the collector of the PNP transistor (Q1), and the second terminal of the second filter module (C2) is grounded.
10. An electronic device, characterized in that, The electronic device includes a voltage protection circuit based on dual threshold determination as described in any one of claims 1-9.