CN110969974A - Power management circuit and method - Google Patents
Power management circuit and method Download PDFInfo
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- CN110969974A CN110969974A CN201911167434.XA CN201911167434A CN110969974A CN 110969974 A CN110969974 A CN 110969974A CN 201911167434 A CN201911167434 A CN 201911167434A CN 110969974 A CN110969974 A CN 110969974A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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Abstract
The application discloses a power management circuit, which comprises a voltage division module, a charging module, a first comparator, a control module, a second comparator and a short-circuit protection module; the first comparator outputs a first comparison result, and the first comparison result is used for controlling a switch of the charging module; the second comparator outputs a second comparison result, and the second comparison result is an enabling signal of the short-circuit protection module; and the short-circuit protection module is used for receiving the second comparison result, and canceling the short-circuit protection module when the second voltage is less than or equal to a second reference voltage, so as to prevent false triggering protection caused by abnormal fluctuation of the input voltage. The invention also provides a power supply management method.
Description
Technical Field
The present application relates to the field of display driving technologies, and in particular, to a power management circuit and method.
Background
With the development of display technology, flat panel display devices such as liquid crystal display devices have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and are becoming the mainstream of display devices.
A Power Management circuit (PMIC) of a conventional lcd device provides various voltages, such as an analog voltage AVDD, a gate-on voltage VGH, a gate-off voltage VGL, and a common electrode voltage VCOM, to drive the lcd device for displaying images. Various protections are added in the used power management circuit, and the existing protections have overvoltage, overcurrent, undervoltage and other protections aiming at the protection of output voltage, and have overcurrent, undervoltage and other protections aiming at the protection of input Voltage (VIN). However, in the power management circuit used, an abnormal voltage drop of the input voltage, such as an abnormal bounce of the utility power, a poor contact, etc., is often encountered, and the Level shift circuit (Level Shifter) performs a discharging operation. If the voltage is rapidly recovered to normal, the other voltage outputs are not changed, and the output voltage of the level conversion circuit is changed from the grid opening Voltage (VGH) to the grid closing Voltage (VGL) again; if the panel capacitance is large, the output conversion of the level conversion circuit needs time, protection is triggered, and the television has different pictures.
In summary, in the conventional power management circuit, an abnormal voltage drop phenomenon occurs in the input voltage during the use process, which is mistakenly identified as an over-current or under-voltage phenomenon, and further triggers the short-circuit protection, which may cause an abnormal phenomenon in the display screen.
Disclosure of Invention
The embodiment of the application provides a power management circuit and a method, which can effectively improve the phenomenon of false triggering protection caused by abnormal fluctuation of input voltage, and solve the technical problem that the phenomenon of abnormal voltage drop of the input voltage in the use process of the conventional power management circuit can be mistakenly judged as over-current or under-voltage phenomenon, and further short-circuit protection is triggered, so that the abnormal phenomenon of a display picture can be possibly caused.
The embodiment of the application provides a power management circuit, includes:
the voltage division module is used for dividing the input voltage to provide a first voltage;
the charging module comprises a capacitor, a switch and a current source, wherein the input end of the switch is connected with the current source, the output end of the switch is connected with the first end of the capacitor, the control end of the switch is connected with the output end of the first comparator, the first end of the capacitor provides a second voltage, and the second end of the capacitor is grounded;
a first comparator for comparing the input first voltage with a first reference voltage and outputting a first comparison result, the first comparison result being used to control the switch;
the control module is used for receiving the signal transmitted by the first comparator and outputting a control signal to the charging module;
the second comparator is used for comparing the input second voltage with a second reference voltage and outputting a second comparison result, wherein the second comparison result is an enabling signal of the short-circuit protection module, and when the second voltage is greater than the second reference voltage, the second comparison result enables the short-circuit protection module;
a short circuit protection module;
and the short-circuit protection module is used for receiving the second comparison result, and canceling the short-circuit protection module when the second voltage is less than or equal to the second reference voltage, so as to prevent false triggering protection caused by abnormal fluctuation of the input voltage.
In some embodiments, when the first voltage is less than the first reference voltage, a first comparison result output by the first comparator controls the switch to be closed; when the first voltage is greater than the first reference voltage, a first comparison result output by the first comparator controls the switch to be switched off.
In some embodiments, the first reference voltage has a voltage of 1.25V.
In some embodiments, the voltage dividing module includes a first resistor and a second resistor, a first end of the first resistor is connected to the input voltage, a second end of the first resistor and a first end of the second resistor are connected to provide the first voltage, and a second end of the second resistor is connected to ground.
In some embodiments, the switch is a triode or a metal oxide semiconductor transistor.
In some embodiments, the non-inverting input terminal of the first comparator inputs the first voltage, and the inverting input terminal inputs the first reference voltage; the non-inverting input end of the second comparator inputs the second voltage, and the inverting input end of the second comparator inputs the second reference voltage.
The embodiment of the present application further provides a power management method, where the method includes:
s10, providing a voltage divider module for dividing the input voltage to provide a first voltage;
s20, setting a first comparator to compare the first voltage with a first reference voltage, and outputting a first comparison result to a control module, where the control module is configured to receive the first comparison result and output a control signal to a charging module;
s30, in the charging module, a switch controls whether a current source charges a capacitor, a first end of the capacitor provides a second voltage, a second end of the capacitor is grounded, and the first comparator is configured to control the switch;
and S40, setting a second comparator to compare the second voltage with a second reference voltage and output a second comparison result to a short-circuit protection module, enabling the short-circuit protection module by the second comparison result when the second voltage is greater than the second reference voltage, and disconnecting the short-circuit protection module by the second comparison result when the second voltage is less than or equal to the second reference voltage to prevent false triggering protection caused by abnormal fluctuation of the input voltage.
In some embodiments, in S10, the voltage dividing module includes a first resistor and a second resistor, a first terminal of the first resistor is connected to the input voltage, a second terminal of the first resistor and a first terminal of the second resistor are connected to provide the first voltage, and a second terminal of the second resistor is connected to ground.
In some embodiments, in S20, when the first voltage is less than the first reference voltage, the comparison result output by the first comparator controls the switch to be closed; when the first voltage is greater than the first reference voltage, a first comparison result output by the first comparator controls the switch to be switched off.
In some embodiments, in S30, the switch is a transistor or a metal oxide semiconductor transistor.
The power management circuit and the power management method increase the detection of the input voltage and effectively improve the phenomenon of false triggering protection caused by abnormal fluctuation of the input voltage.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of a power management circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic flowchart of a power management method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application provides to current power management circuit, input voltage can have unusual pressure drop phenomenon in the use, and it can be declared this phenomenon mistake as overcurrent or under-voltage phenomenon, further triggers short-circuit protection, probably leads to the technical problem that the display screen appears unusual phenomenon, and this defect can be solved to this embodiment.
Fig. 1 is a schematic circuit diagram of a power management circuit according to an embodiment of the present disclosure. The circuit mainly comprises: a voltage dividing module 10 and a level converting module 20, wherein the level converting module 20 includes a charging module 22, a first comparator OP1, a control module 21, a second comparator OP2 and a Short Circuit Protection (SCP); the circuit shown in fig. 1 is provided only for illustrating the embodiments of the present application, and those skilled in the art can make other various changes and modifications according to the technical solutions and concepts provided by the embodiments of the present application.
The voltage dividing module 10 is configured to divide an input voltage (Vin) to provide a first voltage V1, and the voltage dividing module 10 may specifically include a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the input voltage (Vin), a second end of the first resistor R1 is connected to a first end of the second resistor R2 and provides a first voltage V1, and a second end of the second resistor R2 is grounded; that is, the first voltage V1 is collected from a connection point between the first resistor R1 and the second resistor R2, thereby sampling the input voltage Vin.
The charging module 22 includes a capacitor C, a switch S1, and a current source DC controlled by the switch S1 whether to charge the capacitor C; the second end of the capacitor C1 is grounded, the first end is connected with the output end of the switch S1, the input end of the switch S1 is connected with the current source DC, and the other end of the capacitor C provides a second voltage V2; the switch S1 may be a transistor or a metal oxide semiconductor transistor (MOS transistor), or other suitable switching element.
The non-inverting input terminal of the first comparator OP1 inputs the first voltage V1, and the inverting input terminal inputs the first reference voltage VREF 1; the first comparator OP1 is configured to compare the input first voltage V1 with a first reference voltage VREF1, and output a first comparison result, which is used to control the switch S1; in this preferred embodiment, the first reference voltage VREF1 is set to 1.25V.
The control module 21(Controller) is configured to receive the signal sent by the first comparator OP1 and output a control signal to the charging module 22.
The non-inverting input terminal of the second comparator OP2 inputs the second voltage V2, and the inverting input terminal inputs the second reference voltage VREF 2; the second comparator OP2 is configured to compare the input second voltage V2 with a second reference voltage VREF2, and output a second comparison result, where the second comparison result is an enable signal of a short circuit protection module (SCP), and when the second voltage V2 is greater than the second reference voltage VREF2, the second comparison result enables the short circuit protection module (SCP).
The short-circuit protection module (SCP) is configured to receive the second comparison result, and cancel the short-circuit protection module (SCP) when the second voltage V2 is less than or equal to the second reference voltage VREF2, so as to prevent false triggering protection due to abnormal fluctuation of the input voltage.
In the embodiment of the application, the current source DC and the capacitor C are preset, after charging, the second voltage V2 on the capacitor C is related to time, and whether short-circuit protection is performed on the current management circuit is determined by comparing the second voltage V2 with a preset second reference voltage VREF 2.
In the embodiment of the present invention, the input voltage Vin is divided to obtain a first voltage V1, which is compared with a first reference voltage VREF1 to increase the detection of the input voltage Vin.
When the voltage of the input voltage Vin drops rapidly, discharging (Discharge) is triggered, the first voltage V1 is smaller than the first reference voltage VREF1, that is, the discharging voltage is smaller than 1.25V, at this time, a point a outputs a high level, and a discharging function is triggered, at this time, the switch S1 is closed, and the capacitor C is charged; at this time, the second voltage V2 is greater than the second reference voltage VREF2, a point D outputs a high level, the second comparator OP2 enables the short circuit protection module (SCP), and the short circuit protection module (SCP) protects the level conversion module 20.
When the input voltage Vin rapidly rises again, the first voltage V1 is greater than the first reference voltage VREF1 as the input voltage Vin rises, that is, the discharge voltage is greater than 1.25V, the output of point a is low, the discharge is released, and the switch S1 is turned off; and when the second voltage V2 at the point B is not greater than the second reference voltage VREF2, the input voltage Vin is considered to be an abnormal voltage drop, and the output of the point D is a low potential, the short-circuit protection module (SCP) is cancelled, so that the false triggering protection caused by the abnormal fluctuation of the input voltage is prevented.
The embodiment of the application provides a normal power-down sequence or an abnormal power-down sequence by increasing the detection of the input voltage. When the power is normally off, various actions are carried out according to a normal time sequence, and when the power is abnormally off, various voltages need to be reset, and various protections are cancelled when the power is restarted.
As shown in fig. 2 and with reference to fig. 1, based on the same inventive concept, an embodiment of the present application further provides a power management method applied to the power management circuit, where the method includes:
s10, a voltage divider module 10 is provided to divide the input voltage Vin to provide a first voltage V1.
Specifically, the S10 further includes:
the voltage dividing module 10 is configured to divide an input voltage (Vin) to provide a first voltage V1, where the voltage dividing module 10 may specifically include a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the input voltage (Vin), a second end of the first resistor R1 is connected to a first end of the second resistor R2 and provides a first voltage V1, and a second end of the second resistor R2 is grounded; that is, the first voltage V1 is collected from a connection point between the first resistor R1 and the second resistor R2, thereby sampling the input voltage Vin.
S20, the first comparator OP1 is configured to compare the first voltage V1 with a first reference voltage VREF1, and output a first comparison result to the control module 21, where the control module 21 is configured to receive the first comparison result and output a control signal to the charging module 22.
Specifically, the S20 further includes:
the non-inverting input terminal of the first comparator OP1 inputs the first voltage V1, and the inverting input terminal inputs the first reference voltage VREF 1; the first comparator OP1 is configured to compare the input first voltage V1 with a first reference voltage VREF1, and output a first comparison result, which is used to control the switch S1; in this preferred embodiment, the first reference voltage VREF1 is set to 1.25V. The control module 21(Controller) is configured to receive the signal sent by the first comparator OP1 and output a control signal to the charging module 22.
S30, in the charging module 22, the switch S1 controls whether the current source DC charges the capacitor C, the first terminal of the capacitor C provides the second voltage V2, the second terminal of the capacitor C is grounded, and the first comparator OP1 is used to control the switch S1.
Specifically, the S30 further includes:
the charging module 22 includes a capacitor C, a switch S1, and a current source DC controlled by the switch S1 whether to charge the capacitor C; the second end of the capacitor C1 is grounded, the first end is connected with the output end of the switch S1, the input end of the switch S1 is connected with the current source DC, and the other end of the capacitor C provides a second voltage V2; the switch S1 may be a transistor or a metal oxide semiconductor transistor (MOS transistor), or other suitable switching element; the first comparator OP1 is used to control the switch S1.
S40, a second comparator OP2 is arranged, so that the second voltage V2 is compared with a second reference voltage VREF2, a second comparison result is output to a short-circuit protection module (SCP), when the second voltage V2 is larger than the second reference voltage VREF2, the short-circuit protection module (SCP) is enabled by the second comparison result, and when the second voltage V2 is smaller than or equal to the second reference voltage VREF2, the short-circuit protection module (SCP) is disconnected by the second comparison result, and false triggering protection caused by abnormal fluctuation of the input voltage Vin is prevented.
Specifically, the S40 further includes:
the non-inverting input terminal of the second comparator OP2 inputs the second voltage V2, and the inverting input terminal inputs the second reference voltage VREF 2; the second comparator OP2 is configured to compare the input second voltage V2 with a second reference voltage VREF2, and output a second comparison result, where the second comparison result is an enable signal of a short circuit protection module (SCP), and when the second voltage V2 is greater than the second reference voltage VREF2, the second comparison result enables the short circuit protection module (SCP). Wherein the short-circuit protection module (SCP) is configured to receive the second comparison result, and the second comparison result enables the short-circuit protection module (SCP) when the second voltage V2 is greater than the second reference voltage VREF 2; and when the second voltage V2 is less than or equal to the second reference voltage VREF2, the short-circuit protection module (SCP) is cancelled, and the false triggering protection caused by the abnormal fluctuation of the input voltage is prevented.
When the voltage of the input voltage Vin drops rapidly, discharging (Discharge) is triggered, the first voltage V1 is smaller than the first reference voltage VREF1, that is, the discharging voltage is smaller than 1.25V, at this time, a point a outputs a high level, and a discharging function is triggered, at this time, the switch S1 is closed, and the capacitor C is charged; at this time, the second voltage V2 is greater than the second reference voltage VREF2, a point D outputs a high level, the second comparator OP2 enables the short circuit protection module (SCP), and the short circuit protection module (SCP) protects the level conversion module 20.
When the input voltage Vin rapidly rises again, the first voltage V1 is greater than the first reference voltage VREF1 as the input voltage Vin rises, that is, the discharge voltage is greater than 1.25V, the output of point a is low, the discharge is released, and the switch S1 is turned off; and when the second voltage V2 at the point B is not greater than the second reference voltage VREF2, the input voltage Vin is considered to be an abnormal voltage drop, and the output of the point D is a low potential, the short-circuit protection module (SCP) is cancelled, so that the false triggering protection caused by the abnormal fluctuation of the input voltage is prevented.
The power management circuit and the power management method increase the detection of the input voltage and effectively improve the phenomenon of false triggering protection caused by abnormal fluctuation of the input voltage.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing detailed description is directed to a power management circuit and a method provided in an embodiment of the present application, and a specific example is applied in the detailed description to explain the principle and the implementation of the present application, and the description of the foregoing embodiment is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A power management circuit, comprising:
the voltage division module is used for dividing the input voltage to provide a first voltage;
the charging module comprises a capacitor, a switch and a current source, wherein the input end of the switch is connected with the current source, the output end of the switch is connected with the first end of the capacitor, the control end of the switch is connected with the output end of the first comparator, the first end of the capacitor provides a second voltage, and the second end of the capacitor is grounded;
a first comparator for comparing the input first voltage with a first reference voltage and outputting a first comparison result, the first comparison result being used to control the switch;
the control module is used for receiving the signal transmitted by the first comparator and outputting a control signal to the charging module;
the second comparator is used for comparing the input second voltage with a second reference voltage and outputting a second comparison result, wherein the second comparison result is an enabling signal of the short-circuit protection module, and when the second voltage is greater than the second reference voltage, the second comparison result enables the short-circuit protection module;
a short circuit protection module;
and the short-circuit protection module is used for receiving the second comparison result, and canceling the short-circuit protection module when the second voltage is less than or equal to the second reference voltage, so as to prevent false triggering protection caused by abnormal fluctuation of the input voltage.
2. The power management circuit of claim 1, wherein a first comparison result output by the first comparator controls the switch to close when the first voltage is less than the first reference voltage; when the first voltage is greater than the first reference voltage, a first comparison result output by the first comparator controls the switch to be switched off.
3. The power management circuit of claim 2, wherein the first reference voltage has a voltage of 1.25V.
4. The power management circuit according to claim 1, wherein the voltage divider module comprises a first resistor and a second resistor, a first terminal of the first resistor is connected to the input voltage, a second terminal of the first resistor is connected to a first terminal of the second resistor to provide the first voltage, and a second terminal of the second resistor is connected to ground.
5. The power management circuit of claim 1, wherein the switch is a triode or a metal oxide semiconductor transistor.
6. The power management circuit according to claim 1, wherein the first voltage is input to a non-inverting input terminal of the first comparator, and the first reference voltage is input to an inverting input terminal of the first comparator; the non-inverting input end of the second comparator inputs the second voltage, and the inverting input end of the second comparator inputs the second reference voltage.
7. A method for power management, the method comprising:
s10, providing a voltage divider module for dividing the input voltage to provide a first voltage;
s20, setting a first comparator to compare the first voltage with a first reference voltage, and outputting a first comparison result to a control module, where the control module is configured to receive the first comparison result and output a control signal to a charging module;
s30, in the charging module, a switch controls whether a current source charges a capacitor, a first end of the capacitor provides a second voltage, a second end of the capacitor is grounded, and the first comparator is configured to control the switch;
and S40, setting a second comparator to compare the second voltage with a second reference voltage and output a second comparison result to a short-circuit protection module, enabling the short-circuit protection module by the second comparison result when the second voltage is greater than the second reference voltage, and disconnecting the short-circuit protection module by the second comparison result when the second voltage is less than or equal to the second reference voltage to prevent false triggering protection caused by abnormal fluctuation of the input voltage.
8. The power management method according to claim 7, wherein in S10, the voltage divider module includes a first resistor and a second resistor, a first end of the first resistor is connected to the input voltage, a second end of the first resistor is connected to a first end of the second resistor and provides the first voltage, and a second end of the second resistor is connected to ground.
9. The power management method according to claim 7, wherein in S20, when the first voltage is less than the first reference voltage, the comparison result output by the first comparator controls the switch to be closed; when the first voltage is greater than the first reference voltage, a first comparison result output by the first comparator controls the switch to be switched off.
10. The method for power management according to claim 7, wherein in S30, the switch is a transistor or a metal oxide semiconductor transistor.
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Application publication date: 20200407 |