CN111404254B - Power supply control circuit and electronic equipment - Google Patents

Power supply control circuit and electronic equipment Download PDF

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Publication number
CN111404254B
CN111404254B CN202010236994.2A CN202010236994A CN111404254B CN 111404254 B CN111404254 B CN 111404254B CN 202010236994 A CN202010236994 A CN 202010236994A CN 111404254 B CN111404254 B CN 111404254B
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power supply
module
voltage
switch
control circuit
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CN111404254A (en
Inventor
杨秀梅
王牛君
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

The present disclosure provides a power supply control circuit and an electronic device. The power supply control circuit includes: the system power supply end is connected with the system module of the electronic equipment, the switch module is connected with the system power supply end, and the energy storage module is connected with the switch module and is connected to the system power supply end through the switch module. When the voltage of the system power supply end is smaller than the threshold value, the energy storage module supplies power to the system module through the system power supply end through the switch module, the problem that the voltage of the system power supply end is rapidly reduced due to the fact that the electric quantity of the power supply module is low and the load of the system module is large is solved, normal work of each component is guaranteed, and then normal work of the electronic equipment is guaranteed.

Description

Power supply control circuit and electronic equipment
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to a power supply control circuit and an electronic device.
Background
The electronic equipment comprises a mainboard, wherein the mainboard comprises a power supply module and a system module. When the electronic equipment is charged, the power supply and the electronic equipment are connected through the adapter so as to charge the power supply module and the system module. When the electronic equipment is not charged, the power supply module supplies power to the system module, however, when the electric quantity of the power supply module is low and the load of the system module is large, the voltage of the power supply module can be quickly reduced, and when the lower limit voltage of part of components is lower, the components can not work normally, and even the electronic equipment is shut down.
Disclosure of Invention
The present disclosure provides an improved power supply control circuit and an electronic device.
One aspect of the present disclosure provides a power supply control circuit for an electronic device, the power supply control circuit including:
the system power supply end is connected with a system module of the electronic equipment;
the switch module is connected with the system power supply end; and
and the energy storage module is connected with the switch module, is connected to the system power supply end through the switch module, and supplies power to the system module through the switch module and the system power supply end when the voltage of the system power supply end is smaller than a threshold value.
Optionally, the switch module comprises: a first switching unit and a second switching unit;
the first switch unit is connected with the second switch unit, the energy storage module and the power supply end of the system, and comprises a one-way conducting piece and a conducting and disconnecting piece which are connected in parallel;
the second switch unit is connected with the system power supply end;
when the voltage of the system power supply end is smaller than the threshold value, the second switch unit is switched off, the on-off part is switched off, and the energy storage module supplies power to the system power supply end through the one-way conducting part.
Optionally, when the voltage of the system power supply end is greater than or equal to the threshold, the second switch unit is turned on, so that the on-off element is turned on, and the system power supply end charges the energy storage module through the on-off element.
Optionally, the unidirectional conducting element includes a diode, the on-off element includes a first power switching tube, the first power switching tube includes a gate, a first end and a second end, the gate of the first power switching tube is connected to the second switching unit, the first end is connected to the energy storage module, and the second end is connected to the system power supply end;
the anode of the diode is connected with the first end, and the cathode of the diode is connected with the second end.
Optionally, the diode and the first power switch tube are integrated into a first power switch module, and the diode is a body diode.
Optionally, the second switching unit includes a second power switching tube, the second power switching tube includes a gate, a third end and a fourth end, the gate of the second power switching tube is connected to the system power supply end, the third end is connected to the first switching unit, and the fourth end is connected to the ground terminal.
Optionally, the power supply control circuit further includes: the first voltage division module is connected between the system power supply end and the second switch unit, and comprises a first voltage division output end connected with the first switch unit, and the first voltage division module is used for dividing the voltage of the system power supply end and outputting the divided voltage to the first switch unit through the first voltage division output end.
Optionally, the power supply control circuit further includes a first capacitor, one end of the first capacitor is connected between the first voltage dividing module and the first switch unit, and the other end of the first capacitor is grounded.
Optionally, the power supply control circuit further includes: the second voltage division module is connected between the system power supply end and the grounding end, and comprises a second voltage division output end connected with the second switch unit, and the second voltage division module is used for dividing the voltage of the system power supply end and outputting the divided voltage to the second switch unit through the second voltage division output end.
Optionally, the power supply control circuit further includes a second capacitor, one end of the second capacitor is connected between the second voltage dividing module and the second switch unit, and the other end of the second capacitor is grounded.
Optionally, the energy storage module includes an energy storage capacitor, one end of the energy storage capacitor is connected to the first switch unit, and the other end of the energy storage capacitor is grounded.
Another aspect of the present disclosure provides an electronic device, including:
a power supply module;
the system module is connected with the power supply module; and
the power supply control circuit of any one of the above mentioned, the power supply control circuit being connected with the system module.
The technical scheme provided by the embodiment of the disclosure has at least the following beneficial effects:
when the voltage of the system power supply end is smaller than the threshold value, the energy storage module supplies power to the system module through the system power supply end through the switch module, the problem that the voltage of the system power supply end is rapidly reduced due to the fact that the electric quantity of the power supply module is low and the load of the system module is large is solved, normal work of each component is guaranteed, and then normal work of the electronic equipment is guaranteed.
Drawings
FIG. 1 is a block circuit diagram illustrating the connection of an electronic device to an adapter according to an exemplary embodiment of the present disclosure;
FIG. 2 is a block diagram of the power supply control circuit of FIG. 1;
FIG. 3 is a circuit diagram of the power control circuit of FIG. 1;
FIG. 4 is a schematic diagram of the power control circuit of FIG. 3 for supplying power to the system module;
fig. 5 is a schematic diagram illustrating the power supply control circuit of fig. 3 being charged.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
Fig. 1 is a block circuit diagram illustrating the connection of an electronic device to an adapter 100 according to an exemplary embodiment of the present disclosure. Referring to fig. 1, the electronic device includes: a power module 210, a system module 220 and a power supply control circuit 300. The power module 210 is connected to the system module 220, and the power module 210 is used for supplying power to the system module 220. The power supply control circuit 300 is connected to the system module 220. Illustratively, the power supply control circuit 300 is connected between the system module 220 and the power supply module 210. When the electronic device is charged, the system module 220, the power supply module 210 and the power supply control circuit 300 are supplied with power through the adapter 100. When the electronic device is not being charged, power is supplied to the system module 220 through the power module 210.
Illustratively, the power module 210 and the system module 220 are integrated on a motherboard, and the power supply control circuit 300 is disposed separately from the motherboard. Illustratively, the power module 210, the system module 220 and the power control circuit 300 are integrated on a motherboard.
Illustratively, the power module 210 includes two strings of cells in parallel. The supply voltage of the power module 210 may be 7.7V.
The electronic device provided by the embodiment of the present disclosure includes but is not limited to: smart devices such as mobile phones, tablet computers, notebook computers, ipads, digital broadcast terminals, messaging devices, game consoles, medical devices, fitness devices, personal digital assistants, and the like.
Fig. 2 is a block diagram of the power supply control circuit 300 of fig. 1. Referring to fig. 2, the power supply control circuit 300 includes: a system power supply terminal Vsys, a switch module 310 and an energy storage module 320.
With continued reference to fig. 1, the system power supply terminal Vsys is connected to the system module 220 of the electronic device, and the power supply control circuit 300 can supply power to the system module 220 through the system power supply terminal Vsys. The system power supply terminal Vsys is further connected to the power module 210 and the adapter 100, the power module 210 can supply power to the system module 220 through the system power supply terminal Vsys, and the adapter 100 can supply power to the power control circuit 300 through the system power supply terminal Vsys.
With continued reference to fig. 2, the switch module 310 is connected to the system power supply terminal Vsys. The energy storage module 320 is connected to the switch module 310, and is connected to the system power supply terminal Vsys through the switch module 310.
When the voltage of the system power supply terminal Vsys is less than the threshold value, the energy storage module 320 supplies power to the system module 220 through the system power supply terminal Vsys by the switch module 310. It should be noted that the "threshold" may be a lower limit voltage when the components in the system module 220 normally operate. When the electronic device is not charged, the electric quantity of the power supply module 210 is low, and the load of the system module 220 is large, the voltage of the power supply module 210 is easily pulled down rapidly, and the voltage of the system power supply terminal Vsys is equal to the voltage of the power supply module 210 and also pulled down, even smaller than the lower limit voltage of some components, so that the components cannot work normally, and even the electronic device is shut down. Make energy storage module 320 supply power for system module 220 through system power supply end Vsys through switch module 310, this has cushioned the problem that system power supply end Vsys's voltage was pulled down fast, guarantees that each components and parts normally work, and then guarantees that electronic equipment normally works.
When the voltage of the system power supply terminal Vsys is greater than or equal to the threshold, the system power supply terminal Vsys charges the energy storage module 320 through the switching module 310. Illustratively, when the electronic device is charged through the adapter 100, the adapter 100 may charge the energy storage module 320 through the system power supply terminal Vsys. For example, when the electronic device is not charged and the amount of power stored in the power supply module 210 is large, the power supply module 210 may charge the energy storage module 320 through the system power supply terminal Vsys.
So far, the power supply control circuit 300 provided in the embodiment of the present disclosure, when the voltage of the system power supply terminal Vsys is less than the threshold, the energy storage module 320 supplies power to the system module 220 through the system power supply terminal Vsys via the switch module 310, which buffers the problem of rapidly lowering the voltage of the system power supply terminal Vsys due to the low electric quantity of the power supply module 210 and the large load of the system module 220, and ensures that each component normally works, thereby ensuring that the electronic device normally works.
Fig. 3 is a circuit diagram of the power supply control circuit 300 in fig. 1, and the power supply control circuit 300 according to the embodiment of the disclosure is further described below with reference to fig. 3:
in some embodiments, referring to fig. 3, the switch module 310 includes: a first switching unit 311 and a second switching unit 312. The first switch unit 311 is connected to the second switch unit 312, the energy storage module 320 and the system power supply terminal Vsys, and the first switch unit 311 includes a unidirectional conducting element 313 and an on-off element 314 connected in parallel. The second switching unit 312 is connected to the system power supply terminal Vsys. When the voltage of the system power supply terminal Vsys is smaller than the threshold, the second switching unit 312 is turned off, so that the switch 314 is turned off, and the energy storage module 320 supplies power to the system power supply terminal Vsys through the unidirectional switch 313. In other embodiments, when the voltage of the system power supply terminal Vsys is greater than or equal to the threshold, the second switching unit 312 is turned on, so that the on-off element 314 is turned on, and the system power supply terminal Vsys charges the energy storage module 320 through the on-off element 314. Therefore, based on the voltage of the system power supply terminal Vsys, the power supply control circuit 300 automatically controls the energy storage module 320 to supply power to the system power supply terminal Vsys, so as to buffer the problem that the voltage of the system power supply terminal Vsys is rapidly reduced due to the lower electric quantity of the power supply module 210 and the larger load of the system module 220, and ensure the normal operation of the electronic device. And, the power supply control circuit 300 also automatically controls to charge the energy storage module 320 through the system power supply terminal Vsys, so as to facilitate the energy storage module 320 to store power.
Further, in some embodiments, the unidirectional conducting device 313 includes a diode D1, the break-over device 314 includes a first power switch Q1, the first power switch Q1 includes a gate, a first end and a second end, the gate of the first power switch Q1 is connected to the second switch unit 312, the first end is connected to the energy storage module 320, and the second end is connected to the system power supply terminal Vsys; the diode D1 has an anode connected to the first terminal and a cathode connected to the second terminal. The second switching unit 312 includes a second power switch Q2, the second power switch Q2 includes a gate, a third terminal and a fourth terminal, the gate of the second power switch Q2 is connected to the system power supply terminal Vsys, the third terminal is connected to the first switching unit 311, and the fourth terminal is connected to the ground terminal. When the voltage of the system power supply terminal Vsys is smaller than the threshold, the second power switch Q2 is driven to be turned off, so that the first power switch Q1 is turned off, and the energy storage module 320 supplies power to the system power supply terminal Vsys through the diode D1. When the voltage of the system supply terminal Vsys is greater than or equal to the threshold, the second power switch Q2 is driven to be turned on, so that the first power switch Q1 is turned on, and the system supply terminal Vsys charges the energy storage module 320 through the first power switch Q1.
Illustratively, the first power switch Q1 comprises a P-type power switch and the second power switch Q2 comprises an N-type power switch. The gate of the first power switch Q1 is connected to the drain of the second power switch Q2, the first terminal of the first power switch Q1 is the drain and connected to the energy storage module 320, and the second terminal is the source and connected to the system power supply terminal Vsys. The gate of the second power switch Q2 is connected to the system power supply Vsys, the third terminal is the drain and connected to the gate of the first power switch Q1, and the fourth terminal is the source and connected to the ground. In addition, the first power switch tube Q1 may also be an N-type power switch tube and the second power switch tube Q2 may also be a P-type power switch tube, the first power switch tube Q1 may also be a P-type power switch tube, the second power switch tube Q2 may also be a P-type power switch tube, the first power switch tube Q1 may also be an N-type power switch tube and the second power switch tube Q2 may also be an N-type power switch tube, and accordingly, the power supply control circuit 300 further needs to add other circuits to be matched with the first power switch tube Q1 and the second power switch tube Q2, which is not specifically limited by the disclosure.
In some embodiments, the diode D1 and the first power switch Q1 are integrated into a first power switch module, and the diode D1 is a body diode D1. In other words, the body diode D1 is integrally packaged with the first power switch Q1 to form one component. The integrated first power switch module is easy to obtain, occupies a small space, and is beneficial to simplifying the power supply control circuit 300. In other embodiments, the diode D1 and the first power switch Q1 are separated into two components, and the diode D1 is an external diode D1 of the first power switch Q1.
In some embodiments, with continued reference to fig. 3, the second switching unit 312 further includes a diode D2 connected in parallel with the second power switch Q2. In some embodiments, the diode D2 and the second power switch Q2 are integrated into a second power switch module, and the diode D2 is a body diode D2. The body diode D2 functions to prevent electrostatic Discharge (ESD). The second power switch module integrated into a whole is easy to obtain, occupies a small space, and is beneficial to simplifying the power supply control circuit 300.
In some embodiments, with continued reference to fig. 3, the power control circuit 300 further includes: first voltage division module 330 is connected between system power supply end Vsys and second switch element 312, and first voltage division module 330 includes the first voltage division output end of being connected with first switch element 311, and first voltage division module 330 is used for dividing the voltage of system power supply end Vsys, and the voltage after the voltage division is given first switch element 311 through first voltage division output end output. The first switching unit 311 outputs the divided voltage based on the first voltage division module 330 to be turned on or off. Illustratively, the first voltage dividing module 330 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the system power supply terminal Vsys, the other end of the first resistor R2 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the second switching unit 312, and a first voltage dividing output terminal is formed between the first resistor R1 and the second resistor R2 and connected to the first switching unit 311. If the divided voltage of the first resistor R1 satisfies the turn-on condition of the first power switch Q1, the first power switch Q1 is turned on, otherwise, the first power switch Q1 is turned off.
In some embodiments, the power supply control circuit 300 further includes: the second voltage division module 340 is connected between the system power supply terminal Vsys and the ground terminal, the second voltage division module 340 includes a second voltage division output terminal connected to the second switch unit 312, the second voltage division module 340 is configured to divide the voltage of the system power supply terminal Vsys, and output the divided voltage to the second switch unit 312 through the second voltage division output terminal. The second switching unit 312 is turned on or off based on the divided voltage output by the second voltage division module 340. Illustratively, the second voltage division module 340 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the system power supply terminal Vsys, the other end is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, and a second voltage division output terminal is formed between the third resistor R3 and the fourth resistor R4 and connected to the second switching unit 312. If the divided voltage of the fourth resistor R4 satisfies the turn-on condition of the second power switch Q2, the second power switch Q2 is turned on, otherwise, the second power switch Q2 is turned off.
In some embodiments, the power supply control circuit 300 further includes a first capacitor C1, one end of which is connected between the first voltage dividing module 330 and the first switch unit 311, and the other end of which is grounded. Illustratively, one end of the first capacitor C1 is connected between the first resistor R1 and the second resistor R2, and the other end is grounded. The turn-on speed of the first power switch Q1 can be adjusted by the first capacitor C1. In some embodiments, the power supply control circuit 300 further includes a second capacitor C2, one end of which is connected between the second voltage dividing module 340 and the second switch unit 312, and the other end of which is grounded. Illustratively, one end of the second capacitor C2 is connected between the third resistor R3 and the fourth resistor R4, and the other end is grounded. The turn-on speed of the second power switch Q2 can be adjusted by the second capacitor C2.
In some embodiments, the energy storage module 320 includes an energy storage capacitor C3, one end of which is connected to the first switch unit 311, and the other end of which is grounded. The energy storage capacitor C3 can store electric energy and output electric energy, which is beneficial to simplifying the power supply control circuit 300.
Based on the above, in the embodiment of the disclosure, when the electronic device is not charged, for example, the power supply module 210 supplies power to the system power supply terminal Vsys through the direct current Mode (DC Mode), the voltage of the system power supply terminal Vsys is equal to the voltage of the power supply module 210. When the power of the power module 210 is low and the load of the system module 220 is large, so that the voltage of the system power supply terminal Vsys is smaller than the threshold, the switch module 310 adjusts the working state based on the received voltage, so that the energy storage module 320 can supply power to the system power supply terminal Vsys through the switch module 310. When the power of the power module 210 is high and the load of the system module 220 is large, so that the voltage of the system power supply terminal Vsys is smaller than the threshold, similarly, the energy storage module 320 can supply power to the system power supply terminal Vsys through the switch module 310. When the power of the power module 210 is high and the load of the system module 220 causes the voltage of the system power supply terminal Vsys to be greater than or equal to the threshold, the switch module 310 adjusts the operating state based on the received voltage, so that the system power supply terminal Vsys can charge the energy storage module 320 through the switch module 310.
When the electronic device is charged by the adaptor 100, for example, the adaptor 100 supplies power to the system power supply terminal Vsys through an alternating current Mode (AC Mode), and the voltage of the system power supply terminal Vsys is equal to the voltage of the adaptor 100. Generally, the charging voltage of the adapter 100 is high, which makes the voltage of the system power supply terminal Vsys greater than or equal to the threshold, and the switching module 310 adjusts the operating state based on the received voltage, so that the system power supply terminal Vsys can charge the energy storage module 320 through the switching module 310.
Fig. 4 is a schematic diagram of the power supply control circuit 300 in fig. 3 for supplying power to the system module 220, and fig. 5 is a schematic diagram of the power supply control circuit 300 in fig. 3 being charged. In fig. 4 and 5, arrows indicate the current flowing direction. The operation of the power control circuit 300 according to the embodiment of the present disclosure is described in more detail with reference to fig. 3 to 5 as follows:
with continued reference to fig. 3, when the electronic device is not being charged, the voltage of the system power supply terminal Vsys is equal to the voltage of the power module 210, and the second voltage-dividing output terminal between the third resistor R3 and the fourth resistor R4 outputs the divided voltage of the fourth resistor R4 to the gate (gate) of the second power switch Q2. Referring to fig. 4, when the voltage of the system power supply terminal Vsys is less than the threshold value, and when the divided voltage Vsys × R4/(R3+ R4) on the fourth resistor R4 is less than the turn-on voltage Vgsth2 of the second power switch Q2, i.e., the voltage applied to the second power switch Q2
Figure BDA0002431328520000091
The second power switch Q2 is open. The second power switch Q2 is turned off to make the second resistor R2 in a floating state, which makes the voltage across the first resistor R1 zero, and the turn-on voltage Vgsth1 of the first power switch Q1 is not reached, i.e., -Vgs1 < -Vgsth1, and the first power switch Q1 is turned off. At this time, the energy storage capacitor C3 can supply power to the system power supply terminal Vsys through the body diode D1. When the voltage of the system power supply terminal Vsys is greater than or equal to the threshold, the control method is the same as the control method described below, and the description thereof is omitted.
When the electronic device is charged through the adaptor 100, the voltage of the system power supply terminal Vsys is equal to the voltage of the adaptor 100, and the second voltage division output terminal between the third resistor R3 and the fourth resistor R4 outputs the divided voltage of the fourth resistor R4 to the second power switchA gate (gate) of a tube Q2. Referring to fig. 5, when the voltage of the system supply terminal Vsys is greater than or equal to the threshold value, and when the divided voltage Vsys × R4/(R3+ R4) of the fourth resistor R4 is greater than the turn-on voltage Vgsth2 of the second power switch Q2, that is, when the divided voltage Vsys is greater than or equal to the threshold value, the divided voltage Vgsth is equal to the turn-on voltage Vgsth2 of the second power switch Q2
Figure BDA0002431328520000101
The second power switch Q2 is turned on. When the second power switch Q2 is turned on, the second resistor R2 is grounded, and the first voltage division output terminal between the first resistor R1 and the second resistor R2 outputs the divided voltage of the first resistor R1 to the gate (gate) of the first power switch Q1, and when the divided voltage is greater than the turn-on voltage of the first power switch Q1, that is, -Vgs1 > -Vgsth1, the first power switch Q1 is turned on. At this time, the system power supply terminal Vsys charges the energy storage capacitor C3 through the first power switch Q1.
According to the power supply control circuit 300 and the electronic device provided by the embodiment of the disclosure, when the voltage of the system power supply terminal Vsys is less than the threshold value, the voltage division of the first voltage division module 330 and the second voltage division module 340 is combined to disconnect the second switch unit 312 and the first switch unit 311, the energy storage module 320 supplies power to the system power supply terminal Vsys through the one-way conducting piece 313 of the first switch unit 311, which buffers the problem that the voltage of the system power supply terminal Vsys is rapidly reduced due to the low electric quantity of the power supply module 210 and the large load of the system module 220, and ensures that each component normally works, thereby ensuring that the electronic device normally works. When the voltage of the system power supply terminal Vsys is greater than or equal to the threshold value, the second switching unit 312 and the first switching unit 311 are turned on in combination with the voltage division of the first voltage division module 330 and the second voltage division module 340, and the system power supply terminal Vsys charges the energy storage module 320 through the first power switching tube Q1. In addition, the power supply control circuit 300 is simple in structure, low in price and beneficial to popularization and application.
The above embodiments of the present disclosure may be complementary to each other without conflict.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims (11)

1. A power supply control circuit for an electronic device, the power supply control circuit comprising:
the system power supply end is connected with a system module of the electronic equipment;
the switch module is connected with the system power supply end; and
the energy storage module is connected with the switch module and is connected to the system power supply end through the switch module, and when the voltage of the system power supply end is smaller than a threshold value, the energy storage module supplies power to the system module through the system power supply end through the switch module;
the switch module includes: a first switching unit and a second switching unit;
the first switch unit is connected with the second switch unit, the energy storage module and the power supply end of the system, and comprises a one-way conducting piece and a conducting and disconnecting piece which are connected in parallel;
the second switch unit is connected with the system power supply end;
when the voltage of the system power supply end is smaller than the threshold value, the second switch unit is switched off, the on-off part is switched off, and the energy storage module supplies power to the system power supply end through the one-way conducting part.
2. The power supply control circuit according to claim 1, wherein when the voltage of the system power supply terminal is greater than or equal to the threshold, the second switch unit is turned on to turn on the on-off element, and the system power supply terminal charges the energy storage module through the on-off element.
3. The power supply control circuit according to claim 1, wherein the unidirectional conducting element comprises a diode, the switching element comprises a first power switch tube, the first power switch tube comprises a gate, a first end and a second end, the gate of the first power switch tube is connected with the second switch unit, the first end is connected with the energy storage module, and the second end is connected with the system power supply end;
the anode of the diode is connected with the first end, and the cathode of the diode is connected with the second end.
4. The power supply control circuit of claim 3, wherein the diode and the first power switch transistor are integrated into a first power switch module, and the diode is a body diode.
5. The power supply control circuit according to claim 1, wherein the second switch unit comprises a second power switch tube, the second power switch tube comprises a gate, a third terminal and a fourth terminal, the gate of the second power switch tube is connected to the system power supply terminal, the third terminal is connected to the first switch unit, and the fourth terminal is connected to a ground terminal.
6. The power supply control circuit according to claim 1, further comprising: the first voltage division module is connected between the system power supply end and the second switch unit, and comprises a first voltage division output end connected with the first switch unit, and the first voltage division module is used for dividing the voltage of the system power supply end and outputting the divided voltage to the first switch unit through the first voltage division output end.
7. The power supply control circuit according to claim 6, further comprising a first capacitor having one end connected between the first voltage dividing module and the first switch unit and the other end grounded.
8. The power supply control circuit according to claim 1, further comprising: the second voltage division module is connected between the system power supply end and the grounding end, and comprises a second voltage division output end connected with the second switch unit, and the second voltage division module is used for dividing the voltage of the system power supply end and outputting the divided voltage to the second switch unit through the second voltage division output end.
9. The power supply control circuit according to claim 8, further comprising a second capacitor having one end connected between the second voltage dividing module and the second switch unit and the other end grounded.
10. The power supply control circuit according to claim 1, wherein the energy storage module comprises an energy storage capacitor, one end of the energy storage capacitor is connected with the first switch unit, and the other end of the energy storage capacitor is grounded.
11. An electronic device, characterized in that the electronic device comprises:
a power supply module;
the system module is connected with the power supply module; and
the power supply control circuit according to any one of claims 1 to 10, wherein the power supply control circuit is connected to the system module.
CN202010236994.2A 2020-03-30 2020-03-30 Power supply control circuit and electronic equipment Active CN111404254B (en)

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US9647657B1 (en) * 2014-08-26 2017-05-09 GLF Integrated Power, Inc. Programmable slew rate power path switch with integrated super capacitor charging system
CN207573075U (en) * 2017-11-30 2018-07-03 上海京颐科技股份有限公司 A kind of portable medical terminal
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