CN218958619U - Power supply switching circuit and electric equipment - Google Patents

Power supply switching circuit and electric equipment Download PDF

Info

Publication number
CN218958619U
CN218958619U CN202223044501.9U CN202223044501U CN218958619U CN 218958619 U CN218958619 U CN 218958619U CN 202223044501 U CN202223044501 U CN 202223044501U CN 218958619 U CN218958619 U CN 218958619U
Authority
CN
China
Prior art keywords
circuit
resistor
switching
power supply
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202223044501.9U
Other languages
Chinese (zh)
Inventor
张君明
敬仕林
陈青青
贾根基
苏勇健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202223044501.9U priority Critical patent/CN218958619U/en
Application granted granted Critical
Publication of CN218958619U publication Critical patent/CN218958619U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Direct Current Feeding And Distribution (AREA)

Abstract

The utility model relates to a power supply switching circuit and consumer is provided with switch circuit and drive circuit, drive circuit connects external power supply to be connected to power supply circuit and energy storage power supply circuit through switch circuit, can distinguish the external power supply of multiple different voltages through drive circuit, and when the voltage of the external power supply who inserts reduces to corresponding default voltage threshold value, export switching control signal to switch circuit, so that in time switch on energy storage power supply circuit under switch circuit's control, and cut off power supply circuit, the direct switch is to using energy storage device as the load to supply power. Through this scheme, only need the voltage of external power supply to reduce when corresponding preset voltage threshold value, can in time switch to and use energy memory to supply power as the load, need not too much wait for external power supply to fall the power, avoid the influence of the big electrolytic capacitor of external power supply output to the power switch, guarantee the timely nature of power supply switching when the consumer disconnection charges.

Description

Power supply switching circuit and electric equipment
Technical Field
The application relates to the technical field of power supplies, in particular to a power supply switching circuit and electric equipment.
Background
Along with the development of scientific technology and the continuous improvement of the living standard of people, the portable electric equipment with the power supply module is more and more widely used in the daily life of people, and brings great convenience to the daily life of people. When no external power supply is connected, the electric equipment can supply power to the load of the electric equipment through the power supply module, and when the external power supply is connected, the electric equipment supplies power to the load through the external power supply and charges the power supply module.
However, the adapter for external power supply access has a large electrolytic capacitor, and the power cannot be timely turned off when the power supply is disconnected for charging, so that the power supply module cannot be timely switched to supply power to the load.
Disclosure of Invention
Based on the above, it is necessary to provide a power switching circuit and a powered device, which aim at the problem that a power module cannot be switched to a load in time to supply power when the powered device is disconnected for charging.
A power switching circuit, comprising: the power supply device comprises an energy storage power supply circuit, a power supply circuit, a switch circuit and a driving circuit, wherein the energy storage power supply circuit is connected with a load and an energy storage device of electric equipment, the power supply circuit is connected with an external power supply, the load and the energy storage power supply circuit, the switch circuit is connected with the external power supply, the power supply circuit and the energy storage power supply circuit, and the driving circuit is connected with the external power supply and the switch circuit; the driving circuit is used for distinguishing external power supplies with different voltages, and outputting a switching control signal to the switching circuit when the voltage of the external power supply is reduced to a corresponding preset voltage threshold value; the switch circuit is used for controlling the energy storage power supply circuit to be conducted to be communicated with the load and the energy storage device according to the switching control signal, and controlling the power supply circuit to be turned off to disconnect the connection between the external power supply and the load.
The power supply switching circuit is provided with the switching circuit and the driving circuit, the driving circuit is connected with an external power supply and is connected to the power supply circuit and the energy storage power supply circuit through the switching circuit, the driving circuit can distinguish external power supplies with various different voltages, and when the voltage of the accessed external power supply is reduced to a corresponding preset voltage threshold value, a switching control signal is output to the switching circuit, so that the energy storage power supply circuit is timely conducted under the control of the switching circuit, the power supply circuit is cut off, and the switching is directly performed to the power supply using the energy storage device as a load. Through this scheme, only need the voltage of external power supply to reduce when corresponding preset voltage threshold value, can in time switch to and use energy memory to supply power as the load, need not too much wait for external power supply to fall the power, avoid the influence of the big electrolytic capacitor of external power supply output to the power switch, guarantee the timely nature of power supply switching when the consumer disconnection charges.
In one embodiment, the driving circuit includes a first voltage driving circuit and a second voltage driving circuit, the first voltage driving circuit is connected to the external power supply and the switching circuit, and the second voltage driving circuit is connected to the external power supply, the first voltage driving circuit and the switching circuit.
In one embodiment, the first voltage driving circuit includes a switching device U1, a resistor R2, and a resistor R3, a first end of the resistor R1 is connected to the external power supply and the first end of the resistor R2, a second end of the resistor R1 is connected to a control end of the switching device U1 and the first end of the resistor R3, a second end of the resistor R3 is grounded, a first end of the switching device U1 is connected to the second end of the resistor R2, the switching circuit, and the second voltage driving circuit, and a second end of the switching device U1 is connected to the second end of the resistor R3.
In one embodiment, the second voltage driving circuit includes a first switch Guan Yanshi circuit and a first driving control circuit, where the first voltage driving circuit and the first driving control circuit are respectively connected to the first switch delay circuit, and the first driving control circuit is connected to the external power supply and the switch circuit.
In one embodiment, the first switching delay circuit includes a switching tube Q1, a switching tube Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a capacitor C1, where a first end of the resistor R4 is connected to the first voltage driving circuit, a second end of the resistor R4 is connected to the first end of the resistor R5 and a control end of the switching tube Q1, a second end of the resistor R5 is connected to the first end of the switching tube Q1, a first end of the resistor R6 is connected to the first end of the switching tube Q1 and the first driving control circuit, a second end of the switching tube Q1 is connected to the first end of the resistor R7 and the first end of the resistor R8, a second end of the resistor R7 is connected to a control end of the switching tube Q2, a first end of the switching tube Q2 is connected to the second end of the resistor R6 and the first end of the capacitor C1, a second end of the switching tube Q2 is connected to the first end of the capacitor C8 and the first end of the capacitor C1 is connected to the first end of the capacitor C1;
And/or, in one embodiment, the first driving control circuit includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a switching device U2, and a switching tube Q3, where a first end of the resistor R9 is connected to the first open Guan Yanshi circuit and the first end of the resistor R10, a first end of the resistor R10 is connected to an external power supply, a second end of the resistor R9 is connected to the first end of the resistor R11 and the control end of the switching device U2, a second end of the resistor R11 is connected to the first open Guan Yanshi circuit and the first end of the resistor R12, a second end of the resistor R12 is connected to the control end of the switching tube Q3, a first end of the resistor R12 is grounded, a first end of the switching device U2 is connected to the second end of the resistor R10 and the switching circuit, a second end of the switching device U2 is connected to the first end of the switching tube Q3, and a second end of the switching tube Q3 is grounded.
In one embodiment, the driving circuit further includes a third voltage driving circuit, the third voltage driving circuit is connected to the first voltage driving circuit and the second voltage driving circuit, and the third voltage driving circuit is connected to the external power supply and the switching circuit.
In one embodiment, the third voltage driving circuit includes a second switch delay circuit and the second driving control circuit, the second switch delay circuit is connected to the first voltage driving circuit and the second voltage driving circuit, the second driving control circuit is connected to the second switch delay circuit, and the second driving control circuit is connected to the external power supply and the switch circuit.
In one embodiment, the second switching delay circuit includes a switching tube Q4, a switching tube Q5, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, and a capacitor C2, where a first end of the resistor R13 is connected to the first voltage driving circuit and the second voltage driving circuit, a second end of the resistor R13 is connected to the first end of the resistor R14 and a control end of the switching tube Q4, a second end of the resistor R14 is connected to the first end of the switching tube Q4, a first end of the resistor R15 is connected to the first end of the switching tube Q4 and the second driving control circuit, a second end of the switching tube Q4 is connected to the first end of the resistor R16 and the first end of the resistor R17, a second end of the resistor R16 is connected to a control end of the switching tube Q5, a first end of the switching tube Q5 is connected to a second end of the resistor R15 and a control end of the capacitor C4, a first end of the switching tube Q5 is connected to the second end of the capacitor C2, and a second end of the resistor R17 is connected to the second end of the capacitor C2;
And/or, in one embodiment, the second driving control circuit includes a resistor R18, a resistor R19, a resistor R20, a resistor R21, a switching device U3, and a switching tube Q6, where a first end of the resistor R18 is connected to the second open Guan Yanshi circuit and the first end of the resistor R19, a first end of the resistor R19 is connected to an external power source, a second end of the resistor R18 is connected to the first end of the resistor R20 and the control end of the switching device U3, a second end of the resistor R20 is connected to the first end of the resistor R21 and the control end of the switching tube Q6, a second end of the resistor R21 is connected to the second open Guan Yanshi circuit, a first end of the resistor R21 is grounded, a first end of the switching device U3 is connected to the second end of the resistor R19 and the switching circuit, a second end of the switching device U3 is connected to the first end of the switching tube Q6, and a second end of the switching tube Q6 is grounded.
In one embodiment, the third voltage driving circuit further includes a first isolation circuit, and the second switch delay circuit connects the first voltage driving circuit and the second voltage driving circuit through the first isolation circuit.
In one embodiment, the switching circuit includes a resistor R22, a resistor R23, and a switching tube Q7, where a first end of the resistor R22 is connected to the driving circuit, a second end of the resistor R22 is connected to the first end of the resistor R23 and a control end of the switching tube Q7, a second end of the resistor R23 is connected to the external power supply, a first end of the switching tube Q7 is connected to the second end of the resistor R23 and the power supply circuit, and a second end of the switching tube Q7 is connected to the power supply circuit and the energy storage power supply circuit.
In one embodiment, the power supply circuit includes a resistor R24, a resistor R25, a resistor R26, a switching tube Q8, a switching device U4, and a switching device U5, where a first end of the switching device U4 is connected to the switching circuit and the external power supply, a second end of the switching device U4 is connected to the first end of the resistor R24 and the first end of the switching device U5, a second end of the switching device U5 is connected to the load and the energy storage power supply circuit, a second end of the resistor R24 is connected to a control end of the switching device U4, a control end of the switching device U5, and a first end of the resistor R25, a control end of the switching tube Q8 is connected to the switching circuit and the energy storage power supply circuit through the resistor R26, a first end of the switching tube Q8 is connected to a second end of the resistor R25, and a second end of the switching tube Q8 is grounded.
In one embodiment, the energy storage power supply circuit includes a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a switching tube Q9, a switching tube Q10, a switching device U6, and a switching device U7, wherein a first end of the switching device U6 is connected to the load and the power supply circuit, a second end of the switching device U6 is connected to the first end of the resistor R27 and the first end of the switching device U7, a second end of the switching device U7 is connected to the energy storage device and the first end of the resistor R28, a second end of the resistor R27 is connected to the control end of the switching device U6, the control end of the switching device U7 and the first end of the resistor R29, a second end of the switching tube Q29 is connected to the first end of the switching tube Q9, a second end of the switching tube Q9 is grounded, a control end of the switching tube Q9 is connected to the first end of the resistor R30, a second end of the resistor R30 is connected to the second end of the resistor R28 and the first end of the switching tube Q10 is connected to the power supply circuit through the switching tube Q10.
In one embodiment, the power supply switching circuit further comprises a second isolation circuit, and the switching circuit is connected with the driving circuit through the second isolation circuit.
An electric device comprises an energy storage device, a load and the power supply switching circuit.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a power switching circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a power switching circuit according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first voltage driving circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a second voltage driving circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a power switching circuit according to another embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a third voltage driving circuit according to an embodiment of the present application;
Fig. 7 is a schematic diagram of a power switching circuit according to another embodiment of the present application.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a power switching circuit includes: the power supply device comprises an energy storage power supply circuit 20, a power supply circuit 10, a switching circuit 30 and a driving circuit 40, wherein the energy storage power supply circuit 20 is connected with a load and an energy storage device of electric equipment, the power supply circuit 10 is connected with an external power supply VIN, the load and the energy storage power supply circuit 20, the switching circuit 30 is connected with the external power supply VIN, the power supply circuit 10 and the energy storage power supply circuit 20, and the driving circuit 40 is connected with the external power supply VIN and the switching circuit 30; the driving circuit 40 is configured to distinguish between external power sources VIN with different voltages, and output a switching control signal to the switching circuit 30 when the voltage of the external power source VIN drops to a corresponding preset voltage threshold; the switch circuit 30 is used for controlling the energy storage power supply circuit 20 to be turned on to connect the load and the energy storage device according to the switching control signal, and controlling the power supply circuit 10 to be turned off to disconnect the external power source VIN and the load.
Specifically, the energy storage power supply circuit 20 is a circuit for supplying power to a load by storing electric energy by using an energy storage device, and when the energy storage power supply circuit 20 is in a conductive state, the load is connected with the energy storage device, and the load is supplied with power by the energy storage device. The specific type of the energy storage device is not unique, and can be a storage battery and the like, and the specific type is not limited; the specific type of the load is not unique, and the load can be different according to different application scenarios of the power supply switching circuit, for example, a fan, a motor and the like, and the specific limitation is not made.
The power supply circuit 10 is a circuit for supplying power to a load by using an external power source VIN; when the power supply circuit 10 is turned on, the external power source VIN is directly transmitted to the load, and supplies the load with electric power required for operation. The switch circuit 30 is a circuit that outputs a switch control signal to control the power supply circuit 20 and the power supply circuit 10 to be turned on and off. The driving circuit 40 is a circuit for driving the switching circuit 30 to operate, and under the action of a driving signal of the driving circuit 40, the switching circuit 30 can output a corresponding signal to control one of the energy storage power supply circuit 20 and the power supply circuit 10 to be in a conducting state, and the other is in a cutting-off state, so that the switching operation of the load power supply is realized.
In the solution of this embodiment, the driving circuit 40 can distinguish the external power sources VIN with different voltages, that is, under the external power source VIN voltages with different voltage magnitudes, the driving circuit 40 can analyze, according to the actual situation, when the voltage of the external power source VIN is reduced to the corresponding preset voltage threshold, output a switching control signal to the switching circuit 30, so as to switch the load power supply from the external power source VIN power supply mode to the energy storage device power supply in time.
For example, when the voltage of the external power source VIN is 12V (volt), the driving circuit 40 can output a switching control signal to the switching circuit 30 when the voltage drops to a corresponding preset voltage threshold (for example, 11V), and then the energy storage power supply circuit 20 is turned on and the power supply circuit 10 is turned off under the control of the switching circuit 30, so as to supply power to the load by using the energy storage device. When the voltage of the external power source VIN is 9V, the driving ionization can also output a switching control signal to the switch circuit 30 when the voltage is reduced to a corresponding preset voltage threshold (e.g., 8V), and then the energy storage power supply circuit 20 is turned on and the power supply circuit 10 is turned off under the control of the switch circuit 30, so as to supply power to the load by using the energy storage device. Through this kind of setting for power supply switching circuit is fit for multiple different external power source VIN scenes, under different external power source VIN, when external power source VIN stops supplying power, in time switches to energy memory and supplies power for the load, makes power supply switching circuit have more extensive application scene.
It will be appreciated that, in one embodiment, if the external power source VIN is in a connected state, the voltage of the external power source VIN will be greater than the corresponding preset voltage threshold, and the driving circuit 40 will not have a switching control signal, and the power switching circuit will maintain the state of supplying power to the load from the external power source VIN and charging the energy storage device through the external power source VIN (the charging mode is not unique, and may be implemented by providing an additional charging circuit, which is not limited in particular).
In another embodiment, if the power supply mode of the load is switched from the power supply of the energy storage device to the power supply of the external load, the voltage of the external power source VIN detected at the driving circuit 40 is greater than the corresponding preset voltage threshold at the moment when the external power source VIN is connected. At this time, the driving circuit 40 outputs a control signal opposite to the switching control signal to the switching circuit 30, and finally the energy storage power supply circuit 20 is disconnected under the action of the control signal, the power supply circuit 10 is turned on, and the external power source VIN supplies power to the load and charges the energy storage device.
The power supply switching circuit is provided with the switching circuit 30 and the driving circuit 40, the driving circuit 40 is connected with the external power supply VIN, and is connected to the power supply circuit 10 and the energy storage power supply circuit 20 through the switching circuit 30, the external power supply VIN with various different voltages can be distinguished through the driving circuit 40, and when the voltage of the accessed external power supply VIN is reduced to the corresponding preset voltage threshold value, a switching control signal is output to the switching circuit 30, so that the energy storage power supply circuit 20 is timely conducted under the control of the switching circuit 30, the power supply circuit 10 is cut off, and the power supply is directly switched to the power supply using the energy storage device as a load. Through this scheme, only need when the voltage of external power source VIN reduces to corresponding preset voltage threshold value, can in time switch to and use energy memory to supply power for the load, need not too much wait for external power source VIN to fall the power, avoid external power source VIN output big electrolytic capacitor to the influence of power switch, when guaranteeing the consumer disconnection charging, the timeliness of power supply switching.
Referring to fig. 2, in one embodiment, the driving circuit 40 includes a first voltage driving circuit 41 and a second voltage driving circuit 42, the first voltage driving circuit 41 is connected to the external power source VIN and the switching circuit 30, and the second voltage driving circuit 42 is connected to the external power source VIN, the first voltage driving circuit 41 and the switching circuit 30.
Specifically, the first voltage driving circuit 41 is a circuit that outputs a switching control signal to the switching circuit 30 when the voltage of the external power source VIN is reduced to be less than a preset voltage threshold corresponding to the first voltage in the case where the voltage of the external power source VIN is the first voltage. The second voltage driving circuit 42 is a circuit that outputs a switching control signal to the switching circuit 30 when the voltage of the external power source VIN is reduced to be less than a preset voltage threshold corresponding to the second voltage when the voltage of the external power source VIN is the second voltage.
The driving circuit 40 is exemplified to distinguish between two external power sources VIN having different voltages, and the first voltage is greater than the second voltage. When the voltage of the external power source VIN is greater than the preset voltage threshold corresponding to the first voltage, the first voltage driving circuit 41 can output the same control signal to the switch circuit 30 and the second voltage driving circuit 42, and the second voltage driving circuit 42 generates another control signal according to the control signal, and both control signals are transmitted to the switch circuit 30, so that under the control of the switch circuit 30, the energy storage power supply circuit 20 is disconnected and the power supply circuit 10 is turned on, and finally the external power source VIN supplies power. If the voltage of the external power source VIN is less than or equal to the preset voltage threshold corresponding to the first voltage, the first voltage driving circuit 41 can output another control signal to the second voltage driving circuit 42 and the switch circuit 30, and the second voltage driving circuit 42 can also generate a control signal according to the control signal, and both control signals are transmitted to the switch circuit 30, so that under the control of the switch circuit 30, the energy storage power supply circuit 20 is turned on and the power supply circuit 10 is turned off, and finally power is supplied through the energy storage device.
When the external power source VIN is a second voltage type power source, the first voltage driving circuit 41 will maintain outputting a type of control signal to the second voltage driving circuit 42 and the switch circuit 30, and if the voltage of the external power source VIN is greater than the preset voltage threshold corresponding to the second voltage, the second voltage driving circuit 42 will output a first type of control signal to the switch circuit 30, and at this time, the switch circuit 30 will disconnect the energy storage power supply circuit 20 and conduct the power supply circuit 10 under the action of the output control signal of the first voltage driving circuit 41 and the first type of control signal, and finally supply power through the external power source VIN. If the voltage of the external power source VIN is less than or equal to the preset voltage threshold corresponding to the second voltage, the second voltage driving circuit 42 outputs a second type of control signal to the switch circuit 30, and at this time, the switch circuit 30 turns on the energy storage power supply circuit 20 and turns off the power supply circuit 10 under the action of the output control signal of the first voltage driving circuit 41 and the second type of control signal, and finally supplies power through the energy storage device.
It will be appreciated that the magnitudes of the first voltage and the second voltage are not unique, and in a more detailed embodiment, the first voltage is 12V and the second voltage is 9V. Correspondingly, in one embodiment, the preset voltage threshold corresponding to the first voltage may be set to 11V and the preset voltage threshold corresponding to the second voltage may be set to 8V.
By the above scheme, through the design of the first voltage driving circuit 41 and the second voltage driving circuit 42, the power supply switching circuit meets the power supply switching under two external voltage sources with different voltages, so that the power supply switching circuit is suitable for the application scenarios of power supply of two external power supplies VIN.
Referring to fig. 3, in one embodiment, the first voltage driving circuit 41 includes a switching device U1, a resistor R2, and a resistor R3, a first end of the resistor R1 is connected to the external power source VIN and a first end of the resistor R2, a second end of the resistor R1 is connected to a control end of the switching device U1 and a first end of the resistor R3, a second end of the resistor R3 is grounded, a first end of the switching device U1 is connected to a second end of the resistor R2, the switching circuit 30, and the second voltage driving circuit 42, and a second end of the switching device U1 is connected to a second end of the resistor R3.
Specifically, the resistor R1 and the resistor R3 form a voltage dividing circuit, the voltage of the external power supply VIN is divided and then transmitted to the control end of the switching device U1, the switching device U1 can be turned on or off under the action of the divided voltage, and for convenience of understanding, when the divided voltage of the switching device U1 is greater than a preset value, the switching device U1 is turned on for explanation. When the voltage of the external power source VIN does not decrease, the divided voltage obtained by dividing the first voltage can put the switching device U1 into the on state, and the first voltage driving circuit 41 outputs a low level signal to the switching circuit 30. Under the action of the low-level signal, the switch circuit 30 controls the energy storage power supply circuit 20 to be turned off, controls the power supply circuit 10 to be turned on, and maintains the external power supply VIN to supply power.
When the voltage of the external power supply VIN decreases to the preset voltage threshold, the divided voltage is insufficient to drive the switching device U1, so that the switching device U1 is turned off, and the first voltage driving circuit 41 outputs a high level signal to the switching circuit 30 under the pull-up action of the external power supply VIN. Under the action of the high-level signal, the switch circuit 30 controls the energy storage power supply circuit 20 to be turned on, controls the power supply circuit 10 to be turned off, and switches to supply power by the energy storage device.
It should be noted that the specific type of the switching device U1 is not exclusive, and any device capable of determining the on and off states according to the magnitude of the control terminal input voltage may be used. For example, in one more detailed embodiment, the switching device U1 is a controllable precision regulated source chip. Further, the switching device U1 may employ a controllable precision voltage regulator source chip of model TL 431.
Referring to fig. 4, in one embodiment, the second voltage driving circuit 42 includes a first switch delay circuit 421 and a first driving control circuit 422, the first voltage driving circuit 41 and the first driving control circuit 422 are respectively connected to the first switch delay circuit 421, and the first driving control circuit 422 is connected to the external power source VIN and the switch circuit 30.
Specifically, in the solution of this embodiment, the second voltage driving circuit 42 specifically includes a first switch delay circuit 421 and a first driving control circuit 422, and the first switch Guan Yanshi circuit 421 is a circuit for implementing a switch delay function according to an output signal of the first voltage driving circuit 41. The first driving control circuit 422 is a circuit that outputs a driving control signal to the switching circuit 30 under the action of the first switch Guan Yanshi circuit 421 and the external power source VIN.
In order to avoid that the output of the second voltage driving circuit 42 affects the switching circuit 30 when the voltage of the external power source VIN decreases below the preset voltage threshold corresponding to the first voltage, the switching reliability of the power supply mode is ensured. The first voltage driving circuit 41 may simultaneously output a switching control signal to the first switch delay circuit 421, and under the action of the switching control signal, the second voltage driving circuit 42 outputs a signal consistent with the first voltage driving circuit 41, so as to maintain the operation of supplying power by the external power source VIN through the switch circuit 30.
Taking the first voltage driving circuit 41 outputting the high level signal as the switching control signal in the above embodiment as an example for explanation, the first voltage driving circuit 41 simultaneously transmits the high level signal to the first switch delay circuit 421, and delays the on time of the first driving control circuit 422 by the first switch delay circuit 421, so that the second driving control circuit outputs the high level signal to the switch power circuit under the pull-up action of the first voltage.
Referring to fig. 4 in combination, in one embodiment, the first switch delay circuit 421 includes a switch tube Q1, a switch tube Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a capacitor C1, wherein a first end of the resistor R4 is connected to the first voltage driving circuit 41, a second end of the resistor R4 is connected to a first end of the resistor R5 and a control end of the switch tube Q1, a second end of the resistor R5 is connected to a first end of the switch tube Q1, a first end of the resistor R6 is connected to the first end of the switch tube Q1 and a first driving control circuit 422, a second end of the switch tube Q1 is connected to a first end of the resistor R7 and a first end of the resistor R8, a first end of the switch tube Q2 is connected to a first end of the resistor R6 and a first end of the capacitor C1, a second end of the switch tube Q2 is connected to a second end of the resistor R8 and a second end of the capacitor C1, a first end of the capacitor C1 is connected to the first driving control circuit 422, and a second end of the capacitor C1 is grounded;
in one embodiment, referring to fig. 4, the first driving control circuit 422 includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a switching device U2, and a switching tube Q3, wherein a first end of the resistor R9 is connected to the first switch Guan Yanshi circuit 421 and the first end of the resistor R10, a first end of the resistor R10 is connected to the external power source VIN, a second end of the resistor R9 is connected to the first end of the resistor R11 and the control end of the switching device U2, a second end of the resistor R11 is connected to the first switch Guan Yanshi circuit 421 and the first end of the resistor R12, a second end of the resistor R12 is connected to the control end of the switching tube Q3, a first end of the resistor R12 is grounded, a first end of the switching device U2 is connected to the second end of the resistor R10 and the switching circuit 30, a second end of the switching device U2 is connected to the first end of the switching tube Q3, and a second end of the switching tube Q3 is grounded.
Specifically, taking the example in which the first voltage driving circuit 41 outputs the high level signal as the switching control signal in the above embodiment as well, the resistor R6 and the capacitor C1 form an RC circuit, and the high level signal is transmitted into the first switch Guan Yanshi circuit 421 via the resistor R4. Specifically, the on time of the switching tube Q3 is delayed by controlling the charging time of the capacitor C1, and the delay time can be set by changing the resistance value of the resistor R6 and the capacitance value of the capacitor C1, so as to ensure that the switching tube Q3 is kept turned off in the required time. While the switching transistor Q3 is turned off, the switching device U2 is turned off, and thus the first driving control circuit 422 may output a high level signal to the switching circuit 30 under the pull-up action of the external power source VIN.
It will be appreciated that if the voltage of the external power source VIN is the second voltage, the first voltage driving circuit 41 will certainly output the high level signal under the pull-up action of the external power source VIN due to the small divided voltage, and at this time, the second voltage is divided by the resistor R9 and the resistor R11, so that the second switching device U2 is turned on, and the signal output from the first driving control circuit 422 to the switching circuit 30 is pulled down to the low level. Under the action of the high-level signal output by the first voltage driving circuit 41 and the low-level signal output by the second voltage driving circuit 42, the switch circuit 30 controls the energy storage power supply circuit 20 to be turned off, controls the power supply circuit 10 to be turned on, and can supply power to the load through the external power supply VIN. When the voltage of the external power source VIN decreases to the preset voltage threshold corresponding to the second voltage, the voltage division is insufficient to control the second switching device U2 to be turned on, and the signal output from the first driving control circuit 422 to the switching circuit 30 is pulled up to a high level due to the delay action of the first switch Guan Yanshi circuit 421. Finally, the switching circuit 30 controls the tank power supply circuit 20 to be turned on and simultaneously turns off the power supply circuit 10 under the action of the high level signal output by the first voltage driving circuit 41 and the high level signal output by the second voltage driving circuit 42.
Referring to fig. 5 in combination, in one embodiment, the driving circuit 40 further includes a third voltage driving circuit 43, the third voltage driving circuit 43 is connected to the first voltage driving circuit 41 and the second voltage driving circuit 42, and the third voltage driving circuit 43 is connected to the external power source VIN and the switching circuit 30.
Specifically, the third voltage driving circuit 43 is a circuit that outputs a switching control signal to the switching circuit 30 when the voltage of the external power source VIN is reduced to be less than the preset voltage threshold corresponding to the third voltage when the voltage of the external power source VIN is the third voltage. In the scheme of the embodiment, the voltage of the external power supply VIN can be set to three different magnitudes, so that the voltage supply switching operation of the external power supply VIN with three different voltages is realized.
When the voltage of the external power source VIN is greater than the preset voltage threshold corresponding to the first voltage, the first voltage driving circuit 41 can output the same control signal to the switch circuit 30, the second voltage driving circuit 42 and the third voltage driving circuit 43 generate two other control signals according to the control signal, and finally the three control signals are all transmitted to the switch circuit 30, so that the energy storage power supply circuit 20 is disconnected and the power supply circuit 10 is turned on under the control of the switch circuit 30, and the external power source VIN is used for supplying power.
If the voltage of the external power source VIN is less than or equal to the preset voltage threshold corresponding to the first voltage, the first voltage driving circuit 41 can output additional control signals to the second voltage driving circuit 42, the third voltage driving circuit 43 and the switch circuit 30, and the second voltage driving circuit 42 and the third voltage driving circuit 43 can generate additional control signals according to the additional control signals, and the three control signals are transmitted to the switch circuit 30, so that under the control of the switch circuit 30, the energy storage power supply circuit 20 is turned on and the power supply circuit 10 is turned off, and the energy storage device supplies power.
When the second voltage type power supply and the third voltage type power supply of the external power supply VIN are used, the switch circuit 30 respectively turns on the energy storage power supply circuit 20 and the power supply circuit 10 under the action of the control signals output to the switch circuit 30, so that the switching of different power supply modes can be realized.
It is understood that in other embodiments, the driving circuit 40 may further include a fourth voltage driving circuit 40, a fifth voltage driving circuit 40, and so on, so as to implement switching control of four, five or even more external power sources VIN with different voltages, and the implementation manner is similar to that of the above three external power sources VIN with different voltages, which is not described herein again.
It should be noted that the magnitude of the third voltage is not exclusive, and in a more detailed embodiment, the third voltage is 5V. Accordingly, in one embodiment, the preset voltage threshold corresponding to the third voltage is 4V.
Referring to fig. 6, in one embodiment, the third voltage driving circuit 43 includes a second switch delay circuit 431 and a second driving control circuit 432, the second switch delay circuit 431 is connected to the first voltage driving circuit 41 and the second voltage driving circuit 42, the second driving control circuit 432 is connected to the second switch delay circuit 431, and the second driving control circuit 432 is connected to the external power source VIN and the switch circuit 30.
Specifically, the third voltage driving circuit 43 is similar to the second voltage driving circuit 42, and includes a switching delay circuit and a driving control circuit, and the second switching Guan Yanshi circuit 431 is a circuit for implementing a switching delay function according to output signals of the first voltage driving circuit 41 and the second voltage driving circuit 42. The second driving control circuit 432 is a circuit that outputs a driving control signal to the switching circuit 30 under the action of the second switching delay circuit 431 and the external power source VIN.
Similarly, by the scheme of the embodiment, when the voltage of the external power source VIN is reduced below the preset voltage threshold corresponding to the first voltage or below the preset voltage threshold corresponding to the second voltage, the output of the third voltage driving circuit 43 affects the switching circuit 30, so as to ensure the switching reliability of the power supply mode.
Referring to fig. 6, in one embodiment, the second switching delay circuit 431 includes a switching tube Q4, a switching tube Q5, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, and a capacitor C2, wherein a first end of the resistor R13 is connected to the first voltage driving circuit 41 and the second voltage driving circuit 42, a second end of the resistor R13 is connected to a first end of the resistor R14 and a control end of the switching tube Q4, a second end of the resistor R14 is connected to a first end of the switching tube Q4, a first end of the resistor R15 is connected to a first end of the switching tube Q4 and a second driving control circuit 432, a second end of the switching tube Q4 is connected to a first end of the resistor R16 and a first end of the resistor R17, a second end of the resistor R16 is connected to a control end of the switching tube Q5, a first end of the switching tube Q5 is connected to a second end of the resistor R15 and a first end of the capacitor C2, a second end of the switching tube Q5 is connected to a second end of the resistor R17 and a second end of the capacitor C2, a first end of the capacitor C2 is connected to a first end of the capacitor C2, and a second end of the capacitor C2 is connected to a second end of the second control circuit 432;
and/or, in one embodiment, the second driving control circuit 432 includes a resistor R18, a resistor R19, a resistor R20, a resistor R21, a switching device U3, and a switching tube Q6, where a first end of the resistor R18 is connected to the second switching delay circuit 431 and a first end of the resistor R19, a first end of the resistor R19 is connected to the external power source VIN, a second end of the resistor R18 is connected to a first end of the resistor R20 and a control end of the switching device U3, a second end of the resistor R20 is connected to a first end of the resistor R21 and a control end of the switching tube Q6, a second end of the resistor R21 is connected to the second switch Guan Yanshi circuit 431, a first end of the resistor R21 is grounded, a first end of the switching device U3 is connected to a second end of the resistor R19 and the switching circuit 30, a second end of the switching device U3 is connected to a first end of the switching tube Q6, and a second end of the switching tube Q6 is grounded.
Specifically, the specific structure of the third voltage driving circuit 43 is similar to that of the second voltage driving circuit 42, taking the external power source VIN as an example of the power source of the third voltage type, in the actual operation process, if the voltage of the external power source VIN is greater than the preset voltage threshold corresponding to the third voltage, both the first voltage driving circuit 41 and the second voltage driving circuit 42 will be pulled up to output a high level, and the second driving control circuit 432 will be in a conducting state due to the voltage divided by the resistor R18 and the resistor R20 being greater than the set value, and the signal output from the second driving control circuit 432 to the switching circuit 30 is a low level signal. That is, at this time, the switch circuit 30 receives the high level signal output by the first voltage driving circuit 41, the high level signal output by the second voltage driving circuit 42, and the low level signal output by the third voltage driving circuit 43, which finally means that the switch circuit 30 receives the low level signal, at this time, the switch circuit 30 will control the power supply circuit 10 to be turned on, the energy storage power supply circuit 20 to be turned off, and the external power source VIN supplies power to the load.
If the voltage of the external power source VIN is less than or equal to the preset voltage threshold corresponding to the third voltage, both the first voltage driving circuit 41 and the second voltage driving circuit 42 will be pulled up to output a high level, and the second driving control circuit 432 will be turned off due to the fact that the voltage divided by the resistor R18 and the resistor R20 is less than or equal to the set value, and the switching device U3 is turned off, and the signal output from the second driving control circuit 432 to the switching circuit 30 is a high level signal. That is, at this time, the switch circuit 30 receives the high level signal output by the first voltage driving circuit 41, the high level signal output by the second voltage driving circuit 42, and the high level signal output by the third voltage driving circuit 43, which finally indicates that the switch circuit 30 receives the high level signal, at this time, the switch circuit 30 will control the power supply circuit 10 to be turned off, and the energy storage power supply circuit 20 to be turned on, so as to supply power to the load by the energy storage device.
Referring to fig. 6, in one embodiment, the third voltage driving circuit 43 further includes a first isolation circuit 433, and the second switch delay circuit 431 is connected to the first voltage driving circuit 41 and the second voltage driving circuit 42 through the first isolation circuit 433.
Specifically, in the solution of this embodiment, an isolation circuit is further provided between the second switch delay circuit 431 and the first voltage driving circuit 41 and the second voltage driving circuit 42, and the isolation circuit is used for performing electrical isolation, so as to avoid mutual interference between the third voltage driving circuit 43 and the first voltage driving circuit 41 and the second voltage driving circuit 42.
It should be noted that the specific type of the first isolation circuit 433 is not unique, and in a preferred embodiment, referring to fig. 6, the first isolation circuit 433 includes a diode D1 and a diode D2, where an anode of the diode D1 and an anode of the diode D2 are respectively connected to the second switch Guan Yanshi circuit 431, a cathode of the diode D1 is connected to the first voltage driving circuit 41, and a cathode of the diode D2 is connected to the second voltage driving circuit 42.
Referring to fig. 7, in one embodiment, the switching circuit 30 includes a resistor R22, a resistor R23 and a switching tube Q7, a first end of the resistor R22 is connected to the driving circuit 40, a second end of the resistor R22 is connected to a first end of the resistor R23 and a control end of the switching tube Q7, a second end of the resistor R23 is connected to the external power source VIN, a first end of the switching tube Q7 is connected to a second end of the resistor R23 and the power supply circuit 10, and a second end of the switching tube Q7 is connected to the power supply circuit 10 and the energy storage power supply circuit 20.
Specifically, in the scheme of this embodiment, the switching circuit 30 includes a switching tube Q7, a resistor R22, and a resistor R23, and under the effect of the driving circuit 40 outputting a switching control signal, the switching tube Q7 is turned off, so as to control the power supply circuit 10 to be turned off, and control the energy storage power supply circuit 20 to be turned on, so as to realize switching from the external power source VIN to the energy storage device. When the switching control signal is not received, the switching device Q7 is turned on, so as to control the power supply circuit 10 to be turned on and the energy storage power supply circuit 20 to be turned off, thereby realizing power supply by the external power source VIN.
In a more detailed embodiment, the switching control signal is a high level signal, and in the case that each voltage driving circuit 40 outputs a high level signal, the switching circuit 30 controls the tank power supply circuit 20 to be turned on to connect the load and the energy storage device, and controls the power supply circuit 10 to be turned off to disconnect the external power source VIN and the load. Conversely, when any one of the voltage driving circuits 40 outputs a low level signal, the switch circuit 30 receives the low level signal, and at this time, the energy storage power supply circuit 20 is controlled to be turned off, and the power supply circuit 10 is controlled to be turned on.
It will be appreciated that the specific structure of the power supply circuit 10 is not unique, referring to fig. 7, in one embodiment, the power supply circuit 10 includes a resistor R24, a resistor R25, a resistor R26, a switching tube Q8, a switching device U4, and a switching device U5, the first end of the switching device U4 is connected to the switching circuit 30 and the external power source VIN, the second end of the switching device U4 is connected to the first end of the resistor R24 and the first end of the switching device U5, the second end of the switching device U5 is connected to the load and the energy storage power supply circuit 20, the second end of the resistor R24 is connected to the control end of the switching device U4, the control end of the switching device U5, and the first end of the resistor R25, the control end of the switching tube Q8 is connected to the switching circuit 30 and the energy storage power supply circuit 20 through the resistor R26, the first end of the switching tube Q8 is connected to the second end of the resistor R25, and the second end of the switching tube Q8 is grounded.
Specifically, under the action of the output of the switching control signal by the driving circuit 40, when the switching tube Q7 is turned off, the switching tube Q8 in the power supply circuit 10 is turned off, the switching device U4 and the switching device U5 are turned off, and accordingly, the connection between the external power source VIN and the load is disconnected at this time, and the power supply of the external power source VIN is stopped.
Referring to fig. 7, in one embodiment, the tank power supply circuit 20 includes a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a switch Q9, a switch Q10, a switch U6, and a switch U7, wherein a first end of the switch U6 is connected to the load and power supply circuit 10, a second end of the switch U6 is connected to the first end of the resistor R27 and the first end of the switch U7, a second end of the switch U7 is connected to the energy storage device and the first end of the resistor R28, a second end of the resistor R27 is connected to a control end of the switch U6, a control end of the switch U7, and a first end of the resistor R29, a second end of the resistor R29 is connected to the first end of the switch Q9, a second end of the switch Q9 is grounded, a control end of the switch Q9 is connected to the first end of the resistor R30, a second end of the resistor R30 is connected to the second end of the resistor R28 and the first end of the switch Q10, and a control end of the switch Q10 is connected to the power supply circuit 10 through the resistor R31.
Specifically, under the action of the output of the switching control signal by the driving circuit 40, when the switching tube Q7 is turned off, the switching tube Q10 in the energy storage power supply circuit 20 is in an off state, and the switching tube Q9 is in an on state, so that the switching device U6 and the switching device U7 are turned on, and accordingly, the connection between the energy storage device and the load is turned on at the moment, and the power supply state of the energy storage device is entered.
Referring to fig. 7, in one embodiment, the power switching circuit further includes a second isolation circuit 50, and the switching circuit 30 is connected to the driving circuit 40 through the second isolation circuit 50.
Specifically, in the solution of this embodiment, an isolation circuit is further provided between the switching circuit 30 and the driving circuit 40, and electrical isolation is performed by the isolation circuit, so that mutual interference between the driving circuit 40 and the switching circuit 30 is avoided. It should be noted that the specific type of the second isolation circuit 50 is not unique, and in a preferred embodiment, referring to fig. 7, the second isolation circuit 50 includes a diode D3, a diode D4, and a diode D5, where the anode of the diode D3, the anode of the diode D4, and the anode of the diode D5 are respectively connected to the switch circuit 30, the cathode of the diode D3 is connected to the first voltage driving circuit 41, the cathode of the diode D4 is connected to the second voltage driving circuit 42, and the cathode of the diode D5 is connected to the third voltage driving circuit 43.
In order to facilitate understanding of the technical solution of the present application, the present application is explained below in connection with a detailed circuit structure.
Taking the external power source VIN as a 12V voltage type power source as an example, when the external power source VIN is not powered down, that is, the power adapter is not pulled out, the voltage of the external power source VIN is greater than a corresponding preset voltage threshold (11V), at this time, after the voltage is divided by the resistor R1 and the resistor R3 at the point a, the obtained voltage value is greater than the conducting voltage (2.5V) of the switching device U1, at this time, the switching device U1 is in a conducting state, and the ON1 end of the first voltage driving circuit 41 outputs signals to the second voltage driving circuit 42, the third voltage driving circuit 43 and the switching circuit 30 as low level signals. At this time, the voltage division at the point b and the point c are both greater than the corresponding preset voltage threshold, the switching device U2 and the switching device U3 are turned on, the switching tube Q1 is turned on, the switching tube Q3 is turned off, and at this time, the second voltage driving circuit 42 is pulled up to the third driving circuit 40 and the switching circuit 30 to output a high level under the action of the received low level signal. The third driving circuit 40 receives the high and low levels, the switching transistor Q4 is turned on, the switching transistor Q6 is turned off, and the third voltage driving circuit 43 is pulled up to the switching circuit 30 to output the high level. Finally, under the action of the received high and low levels, the switching tube Q7 is turned on, the switching tube Q8 in the power supply circuit 10 is in a conducting state, the switching device U4 and the switching device U5 are in a conducting state, and the external power supply VIN is correspondingly communicated with the load at the moment, so that the power supply of the external power supply VIN is realized. In the energy storage power supply circuit 20, the switching tube Q10 is in an on state, and the switching tube Q9 is in an off state, so that the switching device U6 and the switching device U7 are disconnected, and accordingly connection between the energy storage device and the load is disconnected at the moment.
When the external power supply VIN is powered down, that is, the power adapter is pulled out, the voltage of the external power supply VIN gradually decreases until the voltage is smaller than the corresponding preset voltage threshold (11V). At this time, after the voltage is divided by the resistor R1 and the resistor R3 at the point a, the obtained voltage value is smaller than the ON voltage (2.5V) of the switching device U1, at this time, the switching device U1 is in an off state, and the signals output from the ON1 terminal of the first voltage driving circuit 41 to the second voltage driving circuit 42, the third voltage driving circuit 43 and the switching circuit 30 are high level signals. The second voltage driving circuit 42 makes the switching transistor Q3 in an off state through a switching delay effect under the effect of the received high level signal, and the switching device U2 is in an off state, so that the ON2 terminal of the first driving control circuit 422 can output the high level signal to the switching circuit 30 and the third voltage driving circuit 43 under the pull-up effect of the external power source VIN. The third voltage driving circuit 43 makes the switching tube Q6 in an off state and the switching device U3 in an off state by a switching delay action under the action of the received high level signal, so that the ON3 terminal of the second driving control circuit 432 can output the high level signal to the switching circuit 30 under the pull-up action of the external power source VIN. Finally, under the action of the received high level, the switching tube Q7 of the switching circuit 30 is turned off, the switching tube Q8 of the power supply circuit 10 is in an off state, the switching device U4 and the switching device U5 are in an off state, and accordingly, the connection between the external power source VIN and the load is disconnected. In the energy storage power supply circuit 20, the switching tube Q10 is in a cut-off state, and the switching tube Q9 is in a conduction state, so that the switching device U6 and the switching device U7 are conducted, and the energy storage device and the load are correspondingly connected at the moment, so that the power supply operation of the energy storage device is realized.
When the external power source VIN is 9V or 5V, the working principle of the power switching circuit is similar to that of the above 12V, and under the action of each driving circuit 40, if the external power source VIN is not powered down, that is, the voltage of the external power source VIN is greater than the corresponding preset voltage threshold, the signals output by the three driving circuits 40 to the switching circuit 30 always have one low-level signal and two high-level signals, so that the power supply of the external power source VIN is maintained. When the external power source VIN is not powered down, that is, the voltage of the external power source VIN is less than or equal to the corresponding preset voltage threshold, the signals output by the three driving circuits 40 to the switching circuit 30 are all high-level signals, so that the switching is performed to power the energy storage device, which is not described in detail.
An electric device comprises an energy storage device, a load and the power supply switching circuit.
Specifically, the electrical equipment is specifically shown in the foregoing embodiments and the drawings, and will not be described herein again. The specific type of the electric equipment is not the only type, and can be a fan, a humidifier and the like, and the specific type is not limited. The above-mentioned consumer is provided with the switch circuit 30 and the driving circuit 40, and the driving circuit 40 is connected with the external power source VIN, and is connected to the power supply circuit 10 and the energy storage power supply circuit 20 through the switch circuit 30, and can distinguish the external power source VIN of multiple different voltages through the driving circuit 40, and when the voltage of the external power source VIN that inserts drops to the corresponding preset voltage threshold value, output the switching control signal to the switch circuit 30, so that the energy storage power supply circuit 20 is turned on in time under the control of the switch circuit 30, and the power supply circuit 10 is cut off, and the direct switching is performed to the power supply using the energy storage device as the load. Through this scheme, only need when the voltage of external power source VIN reduces to corresponding preset voltage threshold value, can in time switch to and use energy memory to supply power for the load, need not too much wait for external power source VIN to fall the power, avoid external power source VIN output big electrolytic capacitor to the influence of power switch, when guaranteeing the consumer disconnection charging, the timeliness of power supply switching.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (14)

1. A power switching circuit, comprising:
the energy storage power supply circuit is connected with the load of the electric equipment and the energy storage device;
the power supply circuit is connected with an external power supply, the load and the energy storage power supply circuit;
the switch circuit is connected with the external power supply, the power supply circuit and the energy storage power supply circuit;
a driving circuit connecting the external power supply and the switching circuit;
The driving circuit is used for distinguishing external power supplies with different voltages, and outputting a switching control signal to the switching circuit when the voltage of the external power supply is reduced to a corresponding preset voltage threshold value; the switch circuit is used for controlling the energy storage power supply circuit to be conducted to be communicated with the load and the energy storage device according to the switching control signal, and controlling the power supply circuit to be turned off to disconnect the connection between the external power supply and the load.
2. The power switching circuit of claim 1, wherein the drive circuit comprises a first voltage drive circuit and a second voltage drive circuit, the first voltage drive circuit connecting the external power source and the switch circuit, the second voltage drive circuit connecting the external power source, the first voltage drive circuit, and the switch circuit.
3. The power switching circuit according to claim 2, wherein the first voltage driving circuit includes a switching device U1, a resistor R2, and a resistor R3, a first end of the resistor R1 is connected to the external power supply and the first end of the resistor R2, a second end of the resistor R1 is connected to a control end of the switching device U1 and the first end of the resistor R3, a second end of the resistor R3 is grounded, a first end of the switching device U1 is connected to the second end of the resistor R2, the switching circuit, and the second voltage driving circuit, and a second end of the switching device U1 is connected to the second end of the resistor R3.
4. The power switching circuit according to claim 2, wherein the second voltage driving circuit includes a first switch Guan Yanshi circuit and a first driving control circuit, the first voltage driving circuit and the first driving control circuit being respectively connected to the first switch delay circuit, the first driving control circuit being connected to the external power supply and the switch circuit.
5. The power switching circuit according to claim 4, wherein the first switching delay circuit comprises a switching tube Q1, a switching tube Q2, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a capacitor C1, wherein a first end of the resistor R4 is connected to the first voltage driving circuit, a second end of the resistor R4 is connected to a first end of the resistor R5 and a control end of the switching tube Q1, a second end of the resistor R5 is connected to a first end of the switching tube Q1, a first end of the resistor R6 is connected to a first end of the switching tube Q1 and the first driving control circuit, a second end of the switching tube Q1 is connected to a first end of the resistor R7 and a first end of the resistor R8, a second end of the resistor R7 is connected to a control end of the switching tube Q2, a first end of the switching tube Q2 is connected to a second end of the resistor R6 and a control end of the capacitor C1, a first end of the switching tube Q2 is connected to a first end of the capacitor C1, and a first end of the capacitor C1 is connected to a first end of the capacitor C1;
And/or, the first driving control circuit comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a switching device U2 and a switching tube Q3, wherein a first end of the resistor R9 is connected with the first switch Guan Yanshi circuit and the first end of the resistor R10, a first end of the resistor R10 is connected with an external power supply, a second end of the resistor R9 is connected with the first end of the resistor R11 and the control end of the switching device U2, a second end of the resistor R11 is connected with the first switch Guan Yanshi circuit and the first end of the resistor R12, a second end of the resistor R12 is connected with the control end of the switching tube Q3, a first end of the resistor R12 is grounded, a first end of the switching device U2 is connected with the second end of the resistor R10 and the switching circuit, a second end of the switching device U2 is connected with the first end of the switching tube Q3, and a second end of the switching tube Q3 is grounded.
6. The power switching circuit according to any one of claims 2 to 5, wherein the driving circuit further includes a third voltage driving circuit, the third voltage driving circuit connecting the first voltage driving circuit and the second voltage driving circuit, the third voltage driving circuit connecting the external power supply and the switching circuit.
7. The power switching circuit of claim 6, wherein the third voltage driving circuit comprises a second switch Guan Yanshi circuit and a second drive control circuit, the second switch delay circuit being coupled to the first voltage driving circuit and the second voltage driving circuit, the second drive control circuit being coupled to the second switch delay circuit, the second drive control circuit being coupled to the external power source and the switch circuit.
8. The power switching circuit according to claim 7, wherein the second switching delay circuit comprises a switching tube Q4, a switching tube Q5, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, and a capacitor C2, a first end of the resistor R13 is connected to the first voltage driving circuit and the second voltage driving circuit, a second end of the resistor R13 is connected to the first end of the resistor R14 and a control end of the switching tube Q4, a second end of the resistor R14 is connected to the first end of the switching tube Q4, a first end of the resistor R15 is connected to the first end of the switching tube Q4 and the second driving control circuit, a second end of the switching tube Q4 is connected to the first end of the resistor R16 and the first end of the resistor R17, a second end of the resistor R16 is connected to a control end of the switching tube Q5, a first end of the switching tube Q5 is connected to the second end of the resistor R15 and a control end of the capacitor C2, a first end of the switching tube Q5 is connected to the second end of the capacitor C2, and a second end of the capacitor C2 is connected to the second end of the switching tube Q2;
And/or, the second driving control circuit comprises a resistor R18, a resistor R19, a resistor R20, a resistor R21, a switching device U3 and a switching tube Q6, wherein a first end of the resistor R18 is connected with the second switch Guan Yanshi circuit and the first end of the resistor R19, a first end of the resistor R19 is connected with an external power supply, a second end of the resistor R18 is connected with the first end of the resistor R20 and the control end of the switching device U3, a second end of the resistor R20 is connected with the first end of the resistor R21 and the control end of the switching tube Q6, a second end of the resistor R21 is connected with the second switch Guan Yanshi circuit, a first end of the resistor R21 is grounded, a first end of the switching device U3 is connected with the second end of the resistor R19 and the switching circuit, a second end of the switching device U3 is connected with the first end of the switching tube Q6, and a second end of the switching tube Q6 is grounded.
9. The power switching circuit of claim 7, wherein the third voltage driving circuit further comprises a first isolation circuit, the second switching delay circuit connecting the first voltage driving circuit and the second voltage driving circuit through the first isolation circuit.
10. The power switching circuit according to any one of claims 1 to 5, wherein the switching circuit comprises a resistor R22, a resistor R23 and a switching tube Q7, a first end of the resistor R22 is connected to the driving circuit, a second end of the resistor R22 is connected to the first end of the resistor R23 and a control end of the switching tube Q7, a second end of the resistor R23 is connected to the external power supply, a first end of the switching tube Q7 is connected to the second end of the resistor R23 and the power supply circuit, and a second end of the switching tube Q7 is connected to the power supply circuit and the energy storage power supply circuit.
11. The power supply switching circuit according to any one of claims 1 to 5, wherein the power supply switching circuit comprises a resistor R24, a resistor R25, a resistor R26, a switching tube Q8, a switching device U4 and a switching device U5, a first end of the switching device U4 is connected to the switching circuit and the external power supply, a second end of the switching device U4 is connected to the first end of the resistor R24 and the first end of the switching device U5, a second end of the switching device U5 is connected to the load and the energy storage power supply circuit, a second end of the resistor R24 is connected to a control end of the switching device U4, a control end of the switching device U5 and the first end of the resistor R25, a control end of the switching tube Q8 is connected to the switching circuit and the energy storage power supply circuit through the resistor R26, a first end of the switching tube Q8 is connected to a second end of the resistor R25, and a second end of the switching tube Q8 is grounded.
12. The power supply switching circuit according to any one of claims 1 to 5, wherein the energy storage power supply circuit comprises a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a switching tube Q9, a switching tube Q10, a switching device U6 and a switching device U7, the first end of the switching device U6 is connected to the load and the power supply circuit, the second end of the switching device U6 is connected to the first end of the resistor R27 and the first end of the switching device U7, the second end of the switching device U7 is connected to the energy storage device and the first end of the resistor R28, the second end of the resistor R27 is connected to the control end of the switching device U6, the control end of the switching device U7 and the first end of the resistor R29, the second end of the resistor R29 is connected to the first end of the switching tube Q9, the second end of the switching tube Q9 is grounded, the control end of the switching tube Q9 is connected to the first end of the resistor R30 and the first end of the switching tube Q10 is connected to the power supply circuit, and the second end of the switching tube Q30 is connected to the first end of the switching tube Q10.
13. The power switching circuit according to any one of claims 1 to 5, further comprising a second isolation circuit, wherein the switching circuit is connected to the driving circuit through the second isolation circuit.
14. A powered device comprising an energy storage device, a load, and a power switching circuit as claimed in any one of claims 1-13.
CN202223044501.9U 2022-11-16 2022-11-16 Power supply switching circuit and electric equipment Active CN218958619U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223044501.9U CN218958619U (en) 2022-11-16 2022-11-16 Power supply switching circuit and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223044501.9U CN218958619U (en) 2022-11-16 2022-11-16 Power supply switching circuit and electric equipment

Publications (1)

Publication Number Publication Date
CN218958619U true CN218958619U (en) 2023-05-02

Family

ID=86110838

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202223044501.9U Active CN218958619U (en) 2022-11-16 2022-11-16 Power supply switching circuit and electric equipment

Country Status (1)

Country Link
CN (1) CN218958619U (en)

Similar Documents

Publication Publication Date Title
US6153949A (en) Electrical power management system providing momentarily high power to a load
CN105932733B (en) OTG power supply and its method of supplying power to, OTG equipment and mobile communication equipment
CN107769317B (en) Control circuit, battery with control circuit and battery control method
CN115576406A (en) Power failure detection and power supply maintaining function circuit and electronic equipment
CN115793546A (en) Low-power consumption MCU chip standby control circuit
CN210693486U (en) Standby activation circuit and electronic equipment
CN218958619U (en) Power supply switching circuit and electric equipment
CN209805473U (en) Control circuit and charger of power supply
CN115912603A (en) Power supply switching circuit and electric equipment
CN103107577B (en) Battery management circuit and terminal
CN111262328A (en) Vehicle-mounted terminal standby battery management system
WO2022126560A1 (en) Movable platform, charging and discharging method therefor, and storage medium
CN212033826U (en) Power supply circuit and electronic device
CN111381524B (en) Power supply control circuit
CN112711320A (en) Power switching system and method, computer readable storage medium and processor
CN219477620U (en) Low-voltage power-off and charging activation circuit
CN113381505B (en) Power circuit and power supply method thereof
CN210924256U (en) Battery starting circuit
CN213780904U (en) Power supply switching system
CN213585190U (en) Power control circuit with standby low power consumption
CN216819456U (en) Power supply circuit of robot and robot
CN215580472U (en) Power supply circuit with internal and external battery switching function, power supply module and electric vehicle
CN214626426U (en) Automatic dormancy protection control device of lithium cell group
CN216121899U (en) Hardware self-adaption double-battery switching circuit based on handheld terminal
CN220795724U (en) Full-cut circuit for enabling system power supply of notebook computer to be normally electrified in battery mode

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant