An automatic over-temperature protection circuit and electronic equipment

Abstract

This invention provides an automatic over-temperature protection circuit and electronic device. By configuring a first PTC resistor component in the buck-boost region and a second PTC resistor component in the working region of the electronic device to sense the temperature values ​​of the buck-boost region and the working region respectively, the power supply of the electronic device is cut off after performing logical operations on the temperature values ​​through the voltage divider network. Without significantly increasing the cost of the electronic device, this invention solves the problem that the cooling method of the electronic device may result in insufficient heat dissipation and burnout of the device.

Description

Technical Field

[0001] This utility model relates to the field of electronic power, and in particular to an automatic over-temperature protection circuit and electronic equipment. Background Technology

[0002] In traditional designs, when the temperature of the power supply module or temperature control module on the system motherboard exceeds a preset threshold, the usual practice is to increase the system fan speed and reduce the CPU frequency through the system's management control unit (EC) in an attempt to lower the overall temperature. However, if these methods fail to effectively reduce the temperature, it may cause the heat-generating areas or modules to continue accumulating heat, potentially leading to the risk of burning out the entire machine or system components and permanent functional damage.

[0003] In view of the above, this application is hereby submitted. Utility Model Content

[0004] This utility model discloses an automatic over-temperature protection circuit and electronic device, which aims to solve the problem that the cooling method of electronic devices may not dissipate heat in time and burn out the equipment.

[0005] The first embodiment of this utility model provides an automatic over-temperature protection circuit, including: a first PTC resistor assembly configured in the buck-boost region, a second PTC resistor assembly configured in the working area of ​​the electronic device, and a voltage divider network;

[0006] The first PTC resistor assembly and the second PTC resistor assembly are connected in series and then electrically connected to the voltage divider network. The input terminal of the voltage divider network is used to connect to the power supply, and the output terminal of the voltage divider network is used to connect to the power control terminal of the electronic device.

[0007] The voltage divider network is configured to provide an electrical signal to the power control terminal when the temperature sensed by the first PTC resistor component and the second PTC resistor component exceeds a preset value, so as to power off the electronic device.

[0008] Preferably, the working area of ​​the electronic device includes: the working area of ​​the WiFi module, the working area of ​​the discrete graphics card module, the working area of ​​the 5G module, and the working area of ​​the CPU module.

[0009] Preferably, the voltage divider network includes a first resistor, a second resistor, a third resistor, a first transistor, a second transistor, and a capacitor;

[0010] In this configuration, the base (B) of the first transistor is electrically connected to the first terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is electrically connected to the second terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is grounded, the capacitor is connected in parallel between the emitter (E) and base (B) of the first transistor, the collector (C) of the first transistor is electrically connected to the base (B) of the second transistor, the first resistor is connected in parallel between the base (B) and collector (C) of the second transistor, the emitter (E) of the second transistor is electrically connected to the first terminal of the second resistor, the second terminal of the second resistor is electrically connected to the collector (C) of the second transistor through the third resistor, the collector (C) of the second transistor is grounded through the capacitor, and the first terminal of the first PTC resistor assembly is electrically connected to the collector (C) of the second transistor.

[0011] Preferably, it further includes a first Schottky diode;

[0012] The output terminal of the voltage divider network is electrically connected to the cathode of the first Schottky diode, and the anode of the first Schottky diode is electrically connected to the power control terminal of the electronic device.

[0013] Preferably, it further includes: a Schottky diode assembly;

[0014] The voltage divider network is electrically connected to the power supply through the Schottky diode assembly.

[0015] The second embodiment of this utility model provides an electronic device, including an over-temperature automatic protection circuit as described in any one of the above claims.

[0016] Based on the over-temperature automatic protection circuit and electronic device provided by this utility model, the temperature values ​​of the boost / buck area and the working area are respectively sensed by configuring a first PTC resistor component in the boost / buck area and a second PTC resistor component in the working area of ​​the electronic device. Then, after performing logical operations on the temperature values ​​through the voltage divider network, the power supply of the electronic device is cut off. Without significantly increasing the cost of the electronic device, the problem of the electronic device burning out due to untimely heat dissipation in the cooling method is solved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an automatic over-temperature protection circuit provided in the first embodiment of this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model 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 utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0020] This utility model discloses an automatic over-temperature protection circuit and electronic equipment, which aims to solve the problem that the cooling method of electronic equipment may not dissipate heat in time and burn out the equipment.

[0021] Please see Figure 1 The first embodiment of this utility model provides an automatic over-temperature protection circuit, including: a first PTC resistor assembly configured in the step-up / step-down region 1, a second PTC resistor assembly configured in the working region 2 of the electronic device, and a voltage divider network;

[0022] The first PTC resistor assembly and the second PTC resistor assembly are connected in series and then electrically connected to the voltage divider network. The input terminal of the voltage divider network is used to connect to the power supply, and the output terminal of the voltage divider network is used to connect to the power control terminal of the electronic device.

[0023] The voltage divider network is configured to provide an electrical signal to the power control terminal when the temperature sensed by the first PTC resistor component and the second PTC resistor component exceeds a preset value, so as to power off the electronic device.

[0024] It's important to note that the widespread adoption of smart mobile terminals, such as laptops and various handheld or portable electronic devices, has increased the demands on overall system temperature control. This is especially true for power supply modules or temperature parameter control modules on the motherboard (such as Wi-Fi / 5G / dedicated graphics cards), where temperature rise is particularly noticeable during operation. Standard designs need to periodically ensure that temperature rise doesn't exceed the perceived overheating level, thus preventing user overheating and other potential risks. Typically, when a general-purpose system operates, if the temperature rise of the corresponding power supply module or temperature parameter control module (such as Wi-Fi / 5G / dedicated graphics card) exceeds the designed threshold, the general-purpose system design will require the power supply module (EC) to increase the system fan speed and the CPU to reduce its frequency in an attempt to lower the temperature. If increasing the EC speed or reducing the frequency still fails to reduce the temperature, the continued accumulation of heat in the hot areas or modules can lead to minor issues like component burnout or permanent functional damage.

[0025] This embodiment proposes a low-cost, high-reliability PTC device design circuit for automatic over-temperature protection. It eliminates the need for expensive dedicated temperature detection integrated electronic circuits and considers situations where CPU / EC and other devices lose their corresponding control functions due to excessive temperature and cannot properly dissipate or cool down. This purely hardware-based automatic over-temperature protection and forced power-off design utilizes a multi-point distributed PTC series resistor network and corresponding logic circuit functional modules. If the entire machine, system, or region experiences continuous heat accumulation, it will automatically shut down.

[0026] Specifically, in this embodiment, the first PTC resistor assembly may include RT1, RT2, RT5, and RT6, and the second PTC resistor assembly may include RT3, RT4, RT7, and RT8. Both the first and second PTC resistor assemblies are positive temperature coefficient (PTC) resistors, whose resistance increases with temperature. By using a combination of PTC resistors and a voltage divider network, automatic over-temperature protection for electronic equipment is achieved. Once the temperature exceeds a safe threshold, the circuit will quickly cut off the power supply, effectively preventing damage to the equipment due to overheating. This over-temperature protection mechanism helps improve the safety and stability of electronic equipment, extends equipment lifespan, and reduces potential failures and losses caused by overheating.

[0027] In one possible embodiment of this utility model, the working area of ​​the electronic device includes: the working area of ​​the WiFi module, the working area of ​​the discrete graphics card module, the working area of ​​the 5G module, and the working area of ​​the CPU module.

[0028] It should be noted that in this embodiment, PTC resistors are configured at the above-mentioned modules, which can effectively sense the temperature rise of the modules. These modules are high-power or high-temperature rise modules in the laptop, computer or circuit system, or areas that are key to be controlled and monitored, as well as temperature rise considerations. Of course, PTC resistors can also be configured at other modules to sense the temperature rise of the corresponding areas. No specific limitation is made here, but all these solutions are within the protection scope of this utility model.

[0029] In one possible embodiment of this utility model, the voltage divider network includes a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, a second transistor Q2, and a capacitor C1;

[0030] In this configuration, the base (B) of the first transistor is electrically connected to the first terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is electrically connected to the second terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is grounded, the capacitor C1 is connected in parallel between the emitter (E) and base (B) of the first transistor, the collector (C) of the first transistor is electrically connected to the base (B) of the second transistor Q2, the first resistor R1 is connected in parallel between the base (B) and collector (C) of the second transistor Q2, the emitter (E) of the second transistor Q2 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is electrically connected to the collector (C) of the second transistor Q2 through the third resistor R3, the collector (C) of the second transistor Q2 is grounded through the capacitor C1, and the first terminal of the first PTC resistor assembly is electrically connected to the collector (C) of the second transistor Q2.

[0031] It should be noted that the first resistor R1, the second resistor R2, the third resistor R3, the first transistor Q1, the second transistor Q2, and the capacitor C1 constitute a voltage divider network and key control circuit components. The resistance values ​​here are set to ensure that the base voltage of the first transistor Q1 is:

[0032] Vb=+Vin

R3 / (PR3+RT1+RT2+RT3+RT4+RT5+RT5+RT6+RT7+RT8)

[0033] At normal temperatures, such as when the PTC resistor placed at any temperature detection point or within that area does not exceed the predetermined 85 degrees, PQ1 / PQ2 is cut off, and the power-off control signal +3 / 5VALW_EN in the diagram is logic high, ensuring normal power supply to the motherboard or the entire system.

[0034] If the system or the entire machine continues to generate heat, for example, if the temperature of any temperature sensing point or the PTC resistor placed in that area exceeds the predetermined 85 degrees, PQ1 / PQ2 will be turned on, and the power-off control signal +3 / 5VALW_EN in the diagram will be logic low, cutting off the power supply to the motherboard or the entire system.

[0035] It should be noted that the above control does not require additional controllers such as CPU or EC to make judgments. In other words, when the CPU or EC or similar additional controllers fail to actively cool the motherboard or even fail to control it, causing the motherboard, the whole machine or system to continue to accumulate heat, it is a pure hardware-based automatic overheating and forced power-off design.

[0036] In one possible embodiment of this utility model, a first Schottky diode D1 is also included;

[0037] The output terminal of the voltage divider network is electrically connected to the cathode of the first Schottky diode D1, and the anode of the first Schottky diode D1 is electrically connected to the power control terminal of the electronic device.

[0038] In one possible embodiment of this utility model, it further includes: a Schottky diode assembly DD1;

[0039] The voltage divider network is electrically connected to the power supply through the Schottky diode assembly DD1.

[0040] It should be noted that the introduction of the first Schottky diode D1 and the Schottky diode assembly DD1 enables a dual power supply protection mechanism. The first Schottky diode D1 is connected to the voltage divider network and the power control terminal of the electronic device for overvoltage and overcurrent protection; while the Schottky diode assembly DD1, electrically connected to the power supply through the voltage divider network, provides another layer of power supply protection. This dual mechanism more comprehensively ensures the protection of electronic devices against various power supply anomalies. The introduction of the first Schottky diode D1 allows excessive voltage to be quickly conducted to the power control terminal of the electronic device in the event of a voltage anomaly, thereby shunting the overvoltage and preventing damage to the electronic device. The combination of the first Schottky diode D1 and the Schottky diode assembly DD1 effectively handles overcurrent situations. The Schottky diode assembly DD1, through the voltage divider network, protects the electrical connection of the power supply, and can quickly activate the overcurrent protection mechanism when the current is abnormal, ensuring the stable operation of the electronic device.

[0041] The second embodiment of this utility model provides an electronic device, including an over-temperature automatic protection circuit as described in any one of the above claims.

[0042] Based on the over-temperature automatic protection circuit and electronic device provided by this utility model, the temperature values ​​of the voltage boost / buck region 1 and the working region 2 of the electronic device are sensed by configuring a first PTC resistor component in the voltage boost / buck region 1 and a second PTC resistor component in the working region 2 of the electronic device, respectively. Then, after performing logical operations on the temperature values ​​through the voltage divider network, the power supply of the electronic device is cut off. Without significantly increasing the cost of the electronic device, the problem of the electronic device burning out due to untimely heat dissipation in the cooling method is solved.

[0043] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

Claims

1. An over-temperature automatic protection circuit, characterized by comprising: include: A first PTC resistor assembly configured in the buck-boost region, a second PTC resistor assembly configured in the operating region of the electronic device, and a voltage divider network; The first PTC resistor assembly and the second PTC resistor assembly are connected in series and then electrically connected to the voltage divider network. The input terminal of the voltage divider network is used to connect to the power supply, and the output terminal of the voltage divider network is used to connect to the power control terminal of the electronic device. The voltage divider network is configured to provide an electrical signal to the power control terminal when the temperature sensed by the first PTC resistor component and the second PTC resistor component exceeds a preset value, so as to power off the electronic device.

2. The over-temperature automatic protection circuit according to claim 1, characterized in that, The working areas of the electronic device include: the working area of ​​the WiFi module, the working area of ​​the discrete graphics card module, the working area of ​​the 5G module, and the working area of ​​the CPU module.

3. The over-temperature automatic protection circuit according to claim 1, characterized in that, The voltage divider network includes a first resistor, a second resistor, a third resistor, a first transistor, a second transistor, and a capacitor; In this configuration, the base (B) of the first transistor is electrically connected to the first terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is electrically connected to the second terminal of the first PTC resistor assembly, the emitter (E) of the first transistor is grounded, the capacitor is connected in parallel between the emitter (E) and base (B) of the first transistor, the collector (C) of the first transistor is electrically connected to the base (B) of the second transistor, the first resistor is connected in parallel between the base (B) and collector (C) of the second transistor, the emitter (E) of the second transistor is electrically connected to the first terminal of the second resistor, the second terminal of the second resistor is electrically connected to the collector (C) of the second transistor through the third resistor, the collector (C) of the second transistor is grounded through the capacitor, and the first terminal of the first PTC resistor assembly is electrically connected to the collector (C) of the second transistor.

4. The over-temperature automatic protection circuit according to claim 3, characterized in that, It also includes the first Schottky diode; The output terminal of the voltage divider network is electrically connected to the cathode of the first Schottky diode, and the anode of the first Schottky diode is electrically connected to the power control terminal of the electronic device.

5. The over-temperature automatic protection circuit according to claim 3, characterized in that, Also includes: Schottky diode assembly; The voltage divider network is electrically connected to the power supply through the Schottky diode assembly.

6. An electronic device, comprising: Includes an over-temperature automatic protection circuit as described in any one of claims 1 to 5.

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