Power Abnormality Detection Circuit and Display Terminal

Abstract

This application relates to a power supply abnormality detection circuit and a display terminal. Among them, the circuit includes: a power conversion module for converting an input power supply into an output power supply; a comparison module for comparing the current output power supply with a preset reference power supply to obtain a first comparison signal; a control module for generating a control signal according to the first comparison signal; and a power management module for determining a first working state corresponding to a normal output power supply and a second working state corresponding to an abnormal output power supply according to the control signal. By setting the comparison module and the control module, and finally determining the first working state and the second working state corresponding to the normal and abnormal states of the output power supply according to the control signal, this application can timely switch the power management module to the second working state, turn off the output power supply when the output power supply output by the power conversion module is abnormal, reduce the risk of circuit damage, improve safety, and at the same time reduce circuit losses and costs.

Description

Technical Field

[0001] This application relates to the field of display technologies, and in particular, to a power supply abnormality detection circuit and a display terminal. Background Art

[0002] In related technologies, a buck integrated circuit (Buck IC) can be used in the drive circuit of a display panel to convert an input power supply into an output power supply with a lower voltage value. Specifically, the output power supply of the buck integrated circuit is strongly related to the duty cycle (Ton) of the internal control signal of the buck integrated circuit. By changing the duty cycle of the internal control signal of the buck integrated circuit, the output power supply of the buck integrated circuit can be adjusted.

[0003] However, when the buck integrated circuit is interfered by an external environment, the internal circuit of the buck integrated circuit will be in an abnormal state, which will further cause the duty cycle inside the buck integrated circuit to be unstable, resulting in the phenomenon of too high output power supply. Since the output power supply is too high and exceeds the voltage specification of the subsequent circuit, it may cause the components of the related circuit to burn out. Summary of the Invention

[0004] In view of this, this application proposes a power supply abnormality detection circuit and a display terminal, which can timely switch the power management module to the second working state when the output power supply output by the power conversion module is abnormal, thereby turning off the output power supply, reducing the risk of circuit damage, improving safety, and at the same time reducing circuit loss and cost.

[0005] According to one aspect of this application, a power supply abnormality detection circuit is provided. The power supply abnormality detection circuit includes: a power conversion module for converting an input power supply into an output power supply; a comparison module electrically connected to the power conversion module for comparing the current output power supply with a preset reference power supply to obtain a first comparison signal; a control module electrically connected to the comparison module for generating a control signal according to the first comparison signal; and a power management module electrically connected to the control module for determining a first working state corresponding to a normal output power supply and a second working state corresponding to an abnormal output power supply according to the control signal.

[0006] Further, the comparison module further includes a first comparator. The first comparator includes a first positive input terminal, a first negative input terminal, and a first output terminal, where: the first positive input terminal is electrically connected to the power conversion module for receiving the output power supply of the power conversion module; the first negative input terminal is used for receiving the preset reference power supply; and the first output terminal is electrically connected to the control module for outputting the first comparison signal.

[0007] Further, the control module further includes a first transistor, wherein: a first port of the first transistor is electrically connected to the first output terminal and is configured to receive the first comparison signal; a second port of the first transistor is grounded; a third port of the first transistor is electrically connected to the power management module and is configured to output the control signal.

[0008] Further, the power management module includes a power management chip, and the power management chip is provided with an enable pin, and the enable pin is electrically connected to the third port of the first transistor and is configured to receive the control signal.

[0009] Further, the first working state is a power-on state, and the second working state is a power-off state, wherein: when the output power supply is normal, the control signal controls the enable pin not to be enabled, and the power management module controls the output power supply to be turned on; when the output power supply is abnormal, the control signal controls the enable pin to be enabled, and the power management module controls the output power supply to be turned off.

[0010] Further, the power conversion module further includes a current mirror unit, and the current mirror unit includes a first current source, a second current source, a resistor, and a capacitor, wherein: one end of the first current source is electrically connected to a preset first preset voltage, the other end of the first current source is electrically connected to one end of the resistor, and the other end of the resistor is grounded; one end of the second current source is electrically connected to a preset second preset voltage, the other end of the second current source is electrically connected to one end of the capacitor, and the other end of the capacitor is grounded.

[0011] Further, the power conversion module further includes a second comparator, and the second comparator includes a second positive input terminal, a second negative input terminal, and a second output terminal. The second comparator is configured to generate a second comparison signal according to the voltage across the capacitor, wherein: the second positive input terminal is electrically connected to a preset third preset voltage; the second negative input terminal is electrically connected to one end of the capacitor; the second output terminal is configured to output the second comparison signal.

[0012] Further, the power conversion module further includes a second transistor, wherein: a first port of the second transistor is electrically connected to the second output terminal and is configured to receive the second comparison signal; a second port of the second transistor is electrically connected to the comparison module and is configured to output the output power supply; a third port of the second transistor is configured to receive the input power supply.

[0013] Further, the power conversion module is a buck module, wherein: the output power supply is associated with the duty cycle of the second comparison signal, and the duty cycle of the second comparison signal is associated with the current flowing through the resistor.

[0014] According to another aspect of the present application, a display terminal is provided, and the display terminal includes a display panel and the power anomaly detection circuit, and the power anomaly detection circuit is connected to the display panel.

[0015] By setting a comparison module, comparing the current output power supply with a preset reference power supply to obtain a first comparison signal, and setting a control module, generating a control signal according to the first comparison signal, and finally determining the first working state and the second working state corresponding to the normal and abnormal states of the output power supply according to the control signal. According to various aspects of the present application, when the output power supply output by the power conversion module is abnormal, the power management module can be timely switched to the second working state, thereby turning off the output power supply, reducing the risk of circuit damage, improving safety, and at the same time reducing circuit loss and cost. Description of the Drawings

[0016] The technical solutions and other beneficial effects of the present application will be made obvious by describing the specific embodiments of the present application in detail below in conjunction with the accompanying drawings.

[0017] Figure 1 A schematic diagram showing the principle of the power anomaly detection circuit according to an embodiment of the present application.

[0018] Figure 2 A schematic diagram showing the structure of the power anomaly detection circuit according to an embodiment of the present application.

[0019] Figure 3 A schematic diagram showing the structure of the power conversion module according to an embodiment of the present application.

[0020] Figure 4 A schematic diagram showing the second comparison signal according to an embodiment of the present application. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0023] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, elements and circuits well known to those skilled in the art are not described in detail so as to highlight the gist of the present application.

[0025] This application mainly provides a power supply abnormality detection circuit. The power supply abnormality detection circuit includes: a power conversion module for converting an input power supply into an output power supply; a comparison module electrically connected to the power conversion module, the comparison module being configured to compare the current output power supply with a preset reference power supply to obtain a first comparison signal; a control module electrically connected to the comparison module, the control module being configured to generate a control signal according to the first comparison signal; and a power management module electrically connected to the control module, the power management module being configured to determine a first working state corresponding to a normal output power supply and a second working state corresponding to an abnormal output power supply according to the control signal.

[0026] By setting a comparison module to compare the current output power supply with a preset reference power supply to obtain a first comparison signal, and setting a control module to generate a control signal according to the first comparison signal, and finally determining a first working state and a second working state corresponding to the normal and abnormal states of the output power supply according to the control signal, this application can, when the output power supply output by the power conversion module is abnormal, timely switch the power management module to the second working state, thereby turning off the output power supply, reducing the risk of circuit damage, improving safety, while reducing circuit loss and cost.

[0027] Figure 1 The schematic diagram of the principle of the power supply abnormality detection circuit according to the embodiment of this application is shown.

[0028] As Figure 1 shown, the power supply abnormality detection circuit of this application may include a power conversion module 11, a comparison module 12, a control module 13, and a power management module 14. The power conversion module 11, the comparison module 12, the control module 13, and the power management module 14 are electrically connected in sequence. Exemplarily, the power supply abnormality detection circuit may be used in the driving circuit of a display panel. It can be understood that in this application, application scenarios with a power conversion process can all utilize the inventive concept of this application, and this application does not limit the specific application scenarios of the power supply abnormality detection circuit.

[0029] Among them, the power conversion module is used to convert an input power supply into an output power supply. The input power supply may be a power supply directly input from outside the power supply abnormality detection circuit, or a power supply of other power modules in the driving circuit of the display panel; the output power supply may be the power supply obtained after the input power supply passes through the power conversion module, and the output power supply may be output to a subsequent circuit such as a gamma adjustment module to provide sufficient power for the subsequent circuit.

[0030] Figure 2 The schematic diagram of the structure of the power supply abnormality detection circuit according to the embodiment of this application is shown.

[0031] As Figure 2 shown, the power supply abnormality detection circuit of the present application may include a power conversion module 11, a comparison module, a control module, and a power management module 14. The power conversion module 11 can convert the input power supply Vin into an output power supply Vout.

[0032] Further, the comparison module further includes a first comparator. The first comparator includes a first positive input terminal, a first negative input terminal, and a first output terminal, where: the first positive input terminal is electrically connected to the power conversion module and is used to receive the output power supply of the power conversion module; the first negative input terminal is used to receive a preset reference power supply; the first output terminal is electrically connected to the control module and is used to output the first comparison signal.

[0033] Referring to Figure 2 , the comparison module can be electrically connected to the power conversion module 11. The comparison module can include a first comparator U1. The first positive input terminal of the first comparator U1 is electrically connected to the power conversion module 11 and is used to receive the output power supply Vout of the power conversion module 11; the first negative input terminal of the first comparator U1 is used to receive a preset reference power supply Vref; the first output terminal of the first comparator U1 is electrically connected to the control module and is used to output a first comparison signal Vg1.

[0034] Further, the control module further includes a first transistor, where: the first port of the first transistor is electrically connected to the first output terminal and is used to receive the first comparison signal; the second port of the first transistor is grounded; the third port of the first transistor is electrically connected to the power management module and is used to output the control signal.

[0035] For example, in Figure 2 , the control module can include a first transistor T1. The first port of the first transistor T1 is electrically connected to the first output terminal of the first comparator U1 and is used to receive the first comparison signal Vg1; the second port of the first transistor T1 can be grounded; the third port of the first transistor T1 can be electrically connected to the power management module 14 so as to output the control signal to the power management module 14.

[0036] Further, the power management module includes a power management chip. The power management chip is provided with an enable pin, and the enable pin is electrically connected to the third port of the first transistor and is used to receive the control signal.

[0037] Continuing to refer to Figure 2, the power management module can be implemented using a Power Management IC (PMIC). An enable pin 211 can be provided on the power management chip. When the enable pin 211 is enabled, the power management chip can control the output power Vout to turn on, and at this time the subsequent circuit works; when the enable pin 211 is not enabled, the power management chip can control the output power Vout to turn off, and at this time the subsequent circuit does not work.

[0038] Further, the first working state is the power-on state, and the second working state is the power-off state, where: when the output power is normal, the control signal controls the enable pin to be not enabled, and the power management module controls the output power to turn on; when the output power is abnormal, the control signal controls the enable pin to be enabled, and the power management module controls the output power to turn off.

[0039] In Figure 2 , the comparison module 12 can compare the current output power Vout with a preset reference power Vref to obtain a first comparison signal after comparison. Exemplarily, the reference power can be 3.3V. When the current output power is greater than the reference power, the first comparison signal can be a high-level signal, which further causes the first transistor T1 to conduct, enables the enable pin 211, and turns on the output power Vout; when the current output power is less than or equal to the reference power, the first comparison signal can be a low-level signal, which further causes the first transistor T1 to cut off, the enable pin 211 is not enabled, and the output power Vout is turned off.

[0040] Further, the power conversion module is a buck module. For example, the input power can be 12V, the output power can be 1.8V, and the power conversion module converts 12V to 1.8V. Of course, in the application, the power conversion module can also be a boost module, and the type of the power conversion module in this application is not limited. Hereinafter, this application will take the power conversion module as a buck module as an example for illustration.

[0041] Further, the power conversion module further includes a current mirror unit, and the current mirror unit includes a first current source, a second current source, a resistor, and a capacitor, where: one end of the first current source is electrically connected to a preset first preset voltage, the other end of the first current source is electrically connected to one end of the resistor, and the other end of the resistor is grounded; one end of the second current source is electrically connected to a preset second preset voltage, the other end of the second current source is electrically connected to one end of the capacitor, and the other end of the capacitor is grounded.

[0042] Figure 3Shows a schematic structural diagram of a power conversion module according to an embodiment of the present application.

[0043] As Figure 3 shown, the current mirror unit of the embodiment of the present application may include a first current source E1, a second current source E2, a resistor FS, and a capacitor C. Among them, one end of the first current source E1 is electrically connected to a first preset voltage V1, the other end of the first current source E1 is electrically connected to one end of the resistor FS, and the other end of the resistor FS is grounded; one end of the second current source E2 is electrically connected to a second preset voltage V2, the other end of the second current source E2 is electrically connected to one end of the capacitor C, and the other end of the capacitor C is grounded. The first preset voltage V1 and the second preset voltage V2 can be preset and can be freely adjusted according to the actual situation.

[0044] In Figure 3 , the current I1 of the first current source E1 flows through the branch where the resistor FS is located, and the current I2 of the second current source E2 flows through the branch where the capacitor C is located. For example, I1 = 0.6 / R FS , where 0.6V can be the magnitude of the first preset voltage V1, and R FS can be the resistance value of the resistor FS, that is, by adjusting the resistance value of the resistor FS, the magnitude of the current I1 can be adjusted.

[0045] Furthermore, the current I2 is a mirror image of the current I1, and the current I2 can be several times the current I1. Exemplarily, the current I2 is equal to the current I1 in magnitude. The current I2 charges the capacitor C, thereby forming a voltage across the capacitor C.

[0046] Furthermore, the power conversion module further includes a second comparator, the second comparator includes a second positive input terminal, a second negative input terminal, and a second output terminal, and the second comparator is used to generate a second comparison signal according to the voltage across the capacitor, where: the second positive input terminal is electrically connected to a preset third preset voltage; the second negative input terminal is electrically connected to one end of the capacitor; the second output terminal is used to output the second comparison signal.

[0047] Referring to Figure 3 , the power conversion module 11 of the embodiment of the present application may further include a second comparator U2. The second positive input terminal of the second comparator U2 can be electrically connected to a preset third preset voltage V3, and the second negative input terminal of the second comparator U2 can be electrically connected to one end of the capacitor C. That is, the second comparator can compare the voltage across the capacitor C with the magnitude of the third preset voltage V3 and generate a second comparison signal Vg2. For example, when the voltage across the capacitor C is greater than the third preset voltage, the second comparison signal can be a high-level signal; when the voltage across the capacitor C is less than the third preset voltage, the second comparison signal can be a low-level signal.

[0048] In one example, the second comparison signal can be a periodic signal, such as a Pulse Width Modulation (PWM) signal. Within one period of the second comparison signal, the ratio of the duration of the high-level signal to the total duration of the period can be the duty cycle of the second comparison signal in that period. Since the current I2 is the mirror image of the current I1, by adjusting the resistance value of the resistor FS, the magnitude of the current I1 can be adjusted, and then the magnitude of the current I2 can be adjusted, causing the voltage across the capacitor to change, thereby adjusting the duty cycle of the second comparison signal.

[0049] Further, the power conversion module further includes a second transistor, where: the first port of the second transistor is electrically connected to the second output terminal and is used to receive the second comparison signal; the second port of the second transistor is electrically connected to the comparison module and is used to output the output power supply; the third port of the second transistor is used to receive the input power supply.

[0050] Continue to refer to Figure 3 , the power conversion module may further include a second transistor T2. Among them, the first port of the second transistor T2 can be electrically connected to the second output terminal of the comparator U2 to receive the second comparison signal Vg2; the second port of the second transistor T2 can be used to output the output power supply Vout, such as 1.8V; the third port of the second transistor T2 can be used to receive the input power supply Vin, such as 12V.

[0051] It should be noted that any transistor in this application can be either an N-type or a P-type. For example, when the first transistor is an N-type, the first port of the first transistor can be the gate of the first transistor, the second port of the first transistor can be the source of the transistor, and the third port of the first transistor can be the drain of the transistor; when the first transistor is a P-type, the first port of the first transistor can be the gate of the first transistor, the second port of the first transistor can be the drain of the transistor, and the third port of the first transistor can be the source of the transistor.

[0052] Similarly, when the second transistor is an N-type, the first port of the second transistor can be the gate of the second transistor, the second port of the second transistor can be the source of the transistor, and the third port of the second transistor can be the drain of the transistor; when the second transistor is a P-type, the first port of the second transistor can be the gate of the second transistor, the second port of the second transistor can be the drain of the transistor, and the third port of the second transistor can be the source of the transistor.

[0053] Further, the output power supply is associated with the duty cycle of the second comparison signal, and the duty cycle of the second comparison signal is associated with the current flowing through the resistor. For example, in Figure 3 when the current flowing through resistor FS is I1, a change in current I1 will affect the duty cycle of the second comparison signal Vg2, and by adjusting the duty cycle of the second comparison signal Vg2, the on-time Ton of the second transistor T2 can be adjusted, thereby changing the magnitude of the output power supply. In one example, the duty cycle is equal to the ratio of Vout / Vin and is less than 1, that is, Vout is less than Vin, thereby enabling the power conversion module to achieve a buck function.

[0054] It should be noted that in Figure 3 in addition to the current mirror unit, the second comparator, and the second transistor, the power conversion module 11 may further include other power circuits, such as a low-pass filter circuit, etc. Those skilled in the art can understand that for common power conversion circuits, they can be implemented according to actual needs, and the specific implementation of the power conversion module in this application is not limited.

[0055] Figure 4 Schematic diagram showing the second comparison signal of the embodiment of the present application.

[0056] As Figure 4 shown, Vg11 may be the second comparison signal corresponding to the normal state of the output power supply, and Vg12 may be the second comparison signal corresponding to the abnormal state of the output power supply. It can be seen that the duty cycle of the second comparison signal in the normal state (i.e., the percentage of the high level Ton1 in this cycle) is different from the duty cycle of the second comparison signal in the abnormal state (i.e., the percentage of the high level Ton2 in this cycle).

[0057] For example, when Figure 3 the resistor FS in is affected by external environmental interference (such as human contact, temperature or humidity change, etc.), causing the resistor FS to change, the current I1 flowing through the resistor FS changes, and then the ratio I1 / I2 of the current I1 to the current I2 changes, thereby affecting the duty cycle and ultimately affecting the output power supply of the power conversion module. In actual operation, the output power supply may drift from 1.8V to between 7V - 8V, which exceeds the specifications of the components in the backend circuit, poses a great safety risk, causes damage to the backend components, and increases the product loss.

[0058] Therefore, by providing a comparison module and a control module, the present application can promptly activate the protection mechanism when an abnormal output power supply is detected, thereby avoiding damage to the backend components, reducing the safety risk, and saving costs while reducing losses. It should be noted that the object detected by the present application is the output power supply. Based on the inventive concept of the present application, it is also possible to detect other parameters such as the current of resistor FS (i.e., I1) or the temperature of the power conversion chip, and activate the protection mechanism by determining whether these other parameters are abnormal. It can be understood that the present application does not limit the specific object of detection.

[0059] In addition, the present application also provides a display terminal, which includes a display panel and the power supply abnormality detection circuit, and the power supply abnormality detection circuit is connected to the display panel.

[0060] In summary, in the embodiment of the present application, by providing a comparison module, the current output power supply is compared with a preset reference power supply to obtain a first comparison signal, and a control module is provided to generate a control signal according to the first comparison signal. Finally, according to the control signal, the first working state and the second working state corresponding to the normal and abnormal states of the output power supply are determined respectively. When the output power supply output by the power conversion module is abnormal, the power management module can be promptly switched to the second working state, thereby turning off the output power supply, reducing the risk of circuit damage, improving safety, and reducing circuit losses and costs at the same time.

[0061] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] The power supply abnormality detection circuit and the display terminal provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power anomaly detection circuit, characterized in that, The power anomaly detection circuit includes: A power conversion module for converting an input power supply into an output power supply; A comparison module electrically connected to the power conversion module, the comparison module being configured to compare the current output power supply with a preset reference power supply to obtain a first comparison signal; A control module electrically connected to the comparison module, the control module being configured to generate a control signal according to the first comparison signal; A power management module electrically connected to the control module, the power management module being configured to determine a first operating state corresponding to a normal output power supply and a second operating state corresponding to an abnormal output power supply according to the control signal; The power conversion module further includes a current mirror unit, the current mirror unit including a first current source, a second current source, a resistor, and a capacitor, wherein: one end of the first current source is electrically connected to a preset first preset voltage, the other end of the first current source is electrically connected to one end of the resistor, and the other end of the resistor is grounded; one end of the second current source is electrically connected to a preset second preset voltage, the other end of the second current source is electrically connected to one end of the capacitor, and the other end of the capacitor is grounded; The power conversion module further includes a second comparator, the second comparator including a second positive input terminal, a second negative input terminal, and a second output terminal, the second comparator being configured to generate a second comparison signal according to the voltage across the capacitor; The second positive input terminal is electrically connected to a preset third preset voltage; The second negative input terminal is electrically connected to one end of the capacitor; The second output terminal is configured to output the second comparison signal; The power conversion module further includes a second transistor, wherein: The first port of the second transistor is electrically connected to the second output terminal for receiving the second comparison signal; The second port of the second transistor is electrically connected to the comparison module for outputting the output power supply; The third port of the second transistor is configured to receive the input power supply.

2. The power anomaly detection circuit according to claim 1, wherein The comparison module further includes a first comparator, the first comparator including a first positive input terminal, a first negative input terminal, and a first output terminal, wherein: The first positive input terminal is electrically connected to the power conversion module for receiving the output power supply of the power conversion module; The first negative input terminal is configured to receive a preset reference power supply; The first output terminal is electrically connected to the control module for outputting the first comparison signal.

3. The power anomaly detection circuit according to claim 2, wherein, The control module further includes a first transistor, wherein: The first port of the first transistor is electrically connected to the first output terminal for receiving the first comparison signal; The second port of the first transistor is grounded; The third port of the first transistor is electrically connected to the power management module for outputting the control signal.

4. The power anomaly detection circuit according to claim 3, wherein The power management module includes a power management chip, the power management chip is provided with an enable pin, and the enable pin is electrically connected to the third port of the first transistor for receiving the control signal.

5. The power anomaly detection circuit according to claim 4, characterized in that, The first operating state is a power-on state, and the second operating state is a power-off state, wherein: When the output power supply is normal, the control signal controls the enable pin to be disabled, and the power management module controls the output power supply to be turned on; When the output power supply is abnormal, the control signal controls the enable pin to be enabled, and the power management module controls the output power supply to be turned off.

6. The power supply abnormality detection circuit according to claim 1, wherein The power conversion module is a buck module, wherein: the output power supply is associated with the duty cycle of the second comparison signal, and the duty cycle of the second comparison signal is associated with the current flowing through the resistor.

7. A display terminal, characterized in that, The display terminal includes a display panel and a power supply abnormality detection circuit according to any one of claims 1 to 6, and the power supply abnormality detection circuit is connected to the display panel.

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