CN116191640A - Power supply switching circuit, device and system - Google Patents
Power supply switching circuit, device and system Download PDFInfo
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- CN116191640A CN116191640A CN202211612010.1A CN202211612010A CN116191640A CN 116191640 A CN116191640 A CN 116191640A CN 202211612010 A CN202211612010 A CN 202211612010A CN 116191640 A CN116191640 A CN 116191640A
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- 238000004891 communication Methods 0.000 claims abstract description 45
- 230000002265 prevention Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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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
- 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
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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
- 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
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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
- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- 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
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- 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
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- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a power supply switching circuit, a device and a system, wherein the power supply switching circuit is connected with a plurality of power supply sources; the circuit comprises a control module and a plurality of switch modules, wherein the input end of each switch module is correspondingly connected with the output end of one power supply, the output end of each switch module is used as the output end of the power supply switching circuit, and the control end of each power supply switching circuit is respectively connected with one output end of the control module. The control module and the switch module are separately arranged, the control module responds to a control instruction of a user, the communication state of the switch module is controlled based on the control instruction of the user, and the control module is not involved in the communication of a power supply, so that the requirement of bearing large current on the control module is avoided, the control module with a larger size is not required, the occupied space is reduced, meanwhile, the power supply communication is realized through the switch module, and the voltage overshoot generated by stirring of a mechanical switch is avoided, and the damage to a circuit is avoided.
Description
Technical Field
The present invention relates to the field of power supply of devices, and in particular, to a power supply switching circuit, device and system.
Background
The communication module is widely applied to IOT industries such as POS, power grid, internet of vehicles and the like, and is also applied to MBB markets such as PC, CPE and the like. The communication module is used as a tie connected in the industry of the Internet of things and provides assistance for the interconnection of everything. The communication module is used as a standard component or a fixed component, and needs to perform various functions through an EVB (Evaluation Board) and performance test verification. Meanwhile, the EVB is convenient for the application of clients when supplying power, and needs to support various power supply modes, such as external programmable power supply, USB or power adapter power supply, and can switch between different power supply modes; the existing switching scheme adopts a toggle switch to switch different power supplies, and as the power supply up to 5A is supported, the toggle switch is necessarily large in size, occupies more EVB board space, and meanwhile, the toggle switch is directly used for switching the power supplies to supply power, voltage overshoot can be generated, and damage is caused to a circuit.
Disclosure of Invention
The invention mainly aims to provide a power supply switching circuit, a device and a system, and aims to solve the problem that the prior art switches different power supplies through a toggle switch to occupy more EVB board space and cause damage to the circuit.
In order to achieve the above object, the present invention provides a power supply switching circuit connected to a plurality of power supply sources; the circuit comprises a control module and a plurality of switch modules, wherein the input end of each switch module is correspondingly connected with the output end of one power supply, the output end of each switch module is used as the output end of the power supply switching circuit, and the control end of each power supply switching circuit is connected with one output end of the control module; wherein:
the control module is used for sending a communication signal to the switch module corresponding to the control instruction according to the control instruction;
and the switch module is used for outputting electric energy through a connected power supply when receiving the communication signal.
Optionally, the switch module comprises a first switch tube and a backflow preventing unit; the input end of the first switching tube is used as the input end of the switching module, the output end of the first switching tube is connected with the input end of the backflow preventing unit, the output end of the backflow preventing unit is used as the output end of the switching module, and the control end of the first switching tube and the control end of the backflow preventing unit are used as the control end of the switching module.
Optionally, the first switching tube is a PMOS tube, wherein: the input end of the first switching tube is the source electrode of the PMOS tube, the output end of the first switching tube is the drain electrode of the PMOS tube, and the control end of the first switching tube is the grid electrode of the PMOS tube.
Optionally, the backflow preventing unit comprises a second switching tube; the input end of the second switching tube is used as the input end of the backflow preventing unit, the output end of the second switching tube is used as the output end of the backflow preventing unit, and the control end of the second switching tube is used as the control end of the backflow preventing unit, wherein: the second switching tube is a PMOS tube, the output end of the second switching tube is the source electrode of the PMOS tube, the input end of the second switching tube is the drain electrode of the PMOS tube, and the control end of the second switching tube is the grid electrode of the PMOS tube.
Optionally, the control module includes an instruction trigger unit and a signal unit; the input end of the signal unit is respectively connected with the output end of each power supply, the output end of the signal unit is connected with the instruction triggering unit, and the output end of the instruction triggering unit is used as the output end of the control module.
Optionally, the instruction triggering unit includes a toggle switch, the toggle switch includes a movable contact and a plurality of stationary contacts, each stationary contact corresponds respectively with the control end of switch module is connected, each stationary contact still with the output of signal unit is connected, the movable contact ground connection.
Optionally, the signal unit includes a plurality of first resistors, and first ends of the first resistors are connected with each other and are connected with an output end of the power supply, and second ends of the first resistors are respectively connected with an output end of the command triggering unit correspondingly.
Optionally, the signal unit further includes a plurality of second diodes, each of which is connected between an output terminal of one of the power supplies and a first terminal of the first resistor; wherein:
the positive pole of the second diode is connected with the output end of the power supply, and the negative pole of the second diode is connected with the first end of the first resistor.
In addition, in order to achieve the above object, the present invention also provides a power supply switching device including a circuit board and the power supply switching circuit described above, the power supply switching circuit being disposed on the circuit board.
In addition, in order to achieve the above object, the present invention also provides a power supply switching system including a plurality of power supply sources and the power supply switching circuit as described above.
The invention provides a power supply switching circuit, a device and a system, wherein the power supply switching circuit is connected with a plurality of power supply sources; the circuit comprises a control module and a plurality of switch modules, wherein the input end of each switch module is correspondingly connected with the output end of one power supply, the output end of each switch module is used as the output end of the power supply switching circuit, and the control end of each power supply switching circuit is connected with one output end of the control module; wherein: the control module is used for sending a communication signal to the switch module corresponding to the control instruction according to the control instruction; and the switch module is used for outputting electric energy through a connected power supply when receiving the communication signal. The control module and the switch module are separately arranged, the control module responds to a control instruction of a user, the communication state of the switch module is controlled based on the control instruction of the user, and the control module is not involved in the communication of a power supply, so that the requirement of bearing large current on the control module is avoided, the control module with a larger size is not required, the occupied space is reduced, meanwhile, the power supply communication is realized through the switch module, and the voltage overshoot generated by stirring of a mechanical switch is avoided, and the damage to a circuit is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of an embodiment of a power switching circuit according to the present invention;
fig. 2 is a circuit configuration diagram of the power supply switching circuit of the present invention applied to the embodiment of fig. 1.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Reference numerals illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a power supply switching circuit, which is applied to a power supply switching device. The mobile terminal can be at least one of a mobile phone, a tablet computer, a notebook computer and the like; the intelligent terminal can be a terminal containing a wireless communication module, such as an intelligent automobile, an intelligent watch, a sharing bicycle, an intelligent cabinet and the like; the module may specifically be any one of a wireless communication module, such as a 2G communication module, a 3G communication module, a 4G communication module, a 5G communication module, and an NB-IOT communication module. Referring to fig. 1, fig. 1 is a functional block diagram of an embodiment of a power supply switching circuit according to the present invention. In this embodiment, the power supply switching circuit is connected to a plurality of power supply sources; the circuit comprises a control module 100 and a plurality of switch modules 200, wherein the input end of each switch module 200 is correspondingly connected with the output end of one power supply, the output end of each switch module 200 is used as the output end of the power supply switching circuit, and the control end of each power supply switching circuit is respectively connected with one output end of the control module 100; wherein:
the control module 100 is configured to send a communication signal to the switch module 200 corresponding to the control instruction according to the control instruction;
the switch module 200 is configured to output electrical energy through a connected power supply when the connection signal is received.
The power supply switching circuit obtains the electric energy of the connected power supply and supplies power to the connected modules through the electric energy of the power supply, and it should be noted that the power supply switching circuit in this embodiment can apply different power utilization modules or devices, and in this embodiment, the communication module is taken as an example for explanation, and other types of modules or devices can be applied in analogy, and will not be repeated; the output end of the power supply switching circuit is connected with the communication module.
It can be understood that the number of actually applied switch modules 200 is identical to the number of actually connected power supplies, one switch module 200 corresponds to one power supply, and the output ends of the switch modules 200 are connected with each other and then serve as the output ends of the power supply switching circuit; at the same time, only one switch module 200 is connected to the power supply and the communication module, i.e. at the same time, only one power supply is present to supply power to the communication module.
The control instruction is triggered manually by a user or automatically by a corresponding program; the control instruction is used for indicating the switch module 200 which needs to be communicated; the communication signal is used for indicating the communication to the switch module 200, and it should be noted that a turn-off signal can be set based on the communication signal, and the turn-off signal is used for indicating the turn-off to the switch module 200; when the communication signal is transmitted to the switch module 200 corresponding to the control instruction, the off signal is simultaneously transmitted to the other switch modules 200. The switch module 200 supplies power to the communication module through the connected power supply when receiving the connection signal, and the switch module 200 disconnects the power supply channel between the connected power supply and the communication module when receiving the disconnection signal.
In this embodiment, the control module 100 and the switch module 200 are separately provided, the control module 100 is used to respond to the control instruction of the user, and the communication state of the switch module 200 is controlled based on the control instruction of the user, so that the control module 100 is not involved in the communication of the power supply, thereby avoiding the requirement of bearing large current on the control module 100, avoiding the need of adopting a control module 100 with a larger size, reducing the occupied space, and simultaneously, realizing the power supply communication through the switch module 200, and avoiding the damage to the circuit due to the voltage overshoot generated by the toggle of the mechanical switch.
Further, referring to fig. 2, the switch module 200 includes a first switch tube Q1 and a backflow preventing unit; the input end of the first switching tube Q1 is used as the input end of the switching module 200, the output end of the first switching tube Q1 is connected with the input end of the backflow preventing unit, the output end of the backflow preventing unit is used as the output end of the switching module 200, and the control end of the first switching tube Q1 and the control end of the backflow preventing unit are used as the control ends of the switching module 200. The specific type of the switching tube may be selected based on the actual application scenario and the need, such as a PMOS tube, an NMOS tube, an IGBT, etc., specifically, if the first switching tube Q1 is a PMOS tube, the input end of the first switching tube Q1 is a source electrode of the PMOS tube, the output end of the first switching tube Q1 is a drain electrode of the PMOS tube, and the control end of the first switching tube Q1 is a gate electrode of the PMOS tube; the PMOS tube which can support 5A high current and low conduction internal resistance is selected, in the embodiment, 10mΩ is adopted, the total conduction internal resistance of two PMOS series connection is 20mΩ, and the requirement that the power supply voltage drop of the 5G communication module is below 0.1V when 5A peak current is met.
It can be understood that, if the first switching tube Q1 is an IGBT, the input end of the first switching tube Q1 is used as the collector of the IGBT, the output end of the first switching tube Q1 is used as the emitter of the IGBT, and the control end of the first switching tube Q1 is used as the source of the IGBT; other types of switching transistors can be analogically arranged and will not be described again.
In this embodiment, the first switching tube Q1 is exemplified by a PMOS tube, and at this time, the turn-off signal is at a high level, and the communication signal is at a low level;
the backflow preventing unit comprises a second switching tube Q2; the input end of the second switching tube Q2 is used as the input end of the backflow preventing unit, the output end of the second switching tube Q2 is used as the output end of the backflow preventing unit, and the control end of the second switching tube Q2 is used as the control end of the backflow preventing unit; wherein: the second switching tube Q2 is a PMOS tube, the output end of the second switching tube Q2 is the source electrode of the PMOS tube, the input end of the second switching tube Q2 is the drain electrode of the PMOS tube, and the control end of the second switching tube Q2 is the grid electrode of the PMOS tube.
The second switching tube Q2 is used for preventing backflow among different power supplies; it can be understood that compared with the function of preventing backflow by the diode, the voltage drop generated during output of the power supply can be avoided by the PMOS tube, and the requirement on the power supply is met.
When the grid electrode of the first switching tube Q1 and the grid electrode of the second switching tube Q2 receive a low level, the voltage difference between the source electrode and the grid electrode of the first switching tube Q1 meets a conduction condition, the voltage of the power supply flows through the first switching tube Q1, and meanwhile, due to the action of the body diode of the second switching tube Q2, the voltage difference between the source electrode and the grid electrode of the second switching tube Q2 meets the conduction condition, and the voltage of the power supply flows through the second switching tube Q2 to supply power to the communication module.
When the grid electrode of the first switching tube Q1 and the grid electrode of the second switching tube Q2 receive a high level, the voltage difference between the source electrode and the grid electrode of the first switching tube Q1 and the second switching tube Q2 does not meet the conduction condition, the first switching tube Q1 and the second switching tube Q2 are turned off, and meanwhile, if other switching modules 200 are communicated to supply power for the communication module at the moment, the voltage of other paths of power supply sources can be prevented from flowing backwards due to the action of the body diode of the second switching tube Q2.
The embodiment can realize the on and off between the power supply and the communication module.
Further, the control module 100 includes an instruction triggering unit 101 and a signal unit 102; the input end of the signal unit 102 is connected with the output end of each power supply, the output end of the signal unit 102 is connected with the instruction triggering unit 101, and the output end of the instruction triggering unit 101 is used as the output end of the control module 100.
The signal unit 102 is used for powering the power supply; the command triggering unit 101 is configured to generate a connection signal or a disconnection signal from a voltage obtained from the power supply through the signal unit 102 in response to a control command.
Further, the command triggering unit 101 includes a toggle switch SW1, where the toggle switch SW1 includes a movable contact and a plurality of stationary contacts, each of the stationary contacts is connected to the control end of the switch module 200 correspondingly, each of the stationary contacts is also connected to the output end of the signal unit 102, and the movable contact is grounded.
The connection relation between the movable contact and the fixed contact can be changed by adjusting the movable contact, the movable contact can be in the form of moving the contact itself to change the connection relation with the fixed contact, or a knife is arranged on the movable contact, and the change of the connection relation with the fixed contact is realized by adjusting the position of the knife. It should be noted that the number of the stationary contacts is the same as the number of the switch modules 200 actually used, and one stationary contact is correspondingly connected to the control terminal of one switch module 200.
Further, the signal unit 102 includes a plurality of first resistors R1, and first ends of the first resistors R1 are connected to each other and to the output end of each power supply, and second ends of the first resistors R1 are respectively connected to the output end of the command triggering unit 101 correspondingly.
Each first resistor R1 can take power from each power supply, and the voltage of the power supply is transmitted to the instruction triggering unit 101 through a different first resistor R1. The first resistor R1 is used as a pull-up resistor of the command triggering unit 101, specifically, when the second end of the first resistor R1 is not grounded, the power supply voltage is continuously output to the switch module 200 to provide a high level, and when the second end of the first resistor R1 is grounded, the control end of the connected switch module 200 is grounded to provide a low level, so that the switching between the communication signal and the off signal is realized. It should be noted that, the resistance value of the first resistor R1 may be selected according to practical application requirements, and in this embodiment, set to be 100kΩ.
It should be noted that, the power supply in this embodiment may include a programmable power supply and a USB power supply, where the voltage range of the programmable power supply is generally 3.135V-4.4V, and the USB power supply is 5V, when the power supply is supplied to the communication module, the 5V power supply of the USB needs to be converted into 3.3V power supply through the step-down circuit, but when the signal unit 102 is connected with the power supply, the signal unit is directly connected with the 5V power supply of the USB, and because the USB is 5V power supply and is higher than the voltage of the programmable power supply, the stable voltage provided by the USB when the USB power supply exists can be ensured, and the problem of leakage of the programmable power supply caused by the power supply due to the power supply of the programmable power supply is avoided, thereby ensuring the accuracy of the shutdown leakage current and the sleep power consumption of the programmable power supply measurement module.
Further, the signal unit 102 further includes a plurality of second diodes D2, where each second diode D2 is connected between an output terminal of one of the power supplies and a first terminal of the first resistor R1; wherein:
the positive electrode of the second diode D2 is connected with the output end of the power supply, and the negative electrode of the second diode D2 is connected with the first end of the first resistor R1.
The second diode D2 is used for preventing the voltage between different power supplies from flowing backwards; the second diode D2 can be selected to be a small-sized low-current diode since the current is well below 1 mA. .
It should be noted that, in the foregoing embodiment, the movable contact is grounded, and the switch module 200 outputting the low level is determined by adjusting the connection relationship between the movable contact and the stationary contact; in other embodiments, the signal unit may be further connected to the movable contact to provide a high level, and a corresponding low level generating structure is disposed at the stationary contact, where the switch module 200 outputting the high level is determined by adjusting the connection relationship between the movable contact and the stationary contact; such as:
the output end of each power supply is connected with the positive electrode of the corresponding second diode, the negative electrode of each second diode is connected with the first end of the first resistor, and the second end of the first resistor is connected with the movable contact of the toggle switch; the fixed contact of the toggle switch is connected with the control end of the corresponding switch module, and meanwhile, the fixed contact is grounded through a second resistor. It should be noted that, in this embodiment, only the basic circuit structure is described, and the adjustment setting can be performed based on the actual application requirement, which is not described herein.
The scheme of the present embodiment will be described below based on fig. 2;
the switch comprises a toggle switch SW1, a switch module 2, a programmable power supply and a power supply, wherein the pin 1 of the toggle switch SW1 is a static contact connected with the switch module 1, the pin 3 is a static contact connected with the switch module 2, the pin 2 is a movable contact, the switch module 1 is connected with the USB power supply, and the switch module 2 is connected with the programmable power supply.
When pin 2 and pin 1 of toggle switch SW1 are shorted, USB power enable vbus_en is low, switch module 2001 is turned on, and the communication module is powered by the USB power. When the pins 2 and 3 of the toggle switch SW1 are short-circuited, the programmable power supply enables DCIN_EN to be at a low level, the switch module 2 is conducted, and the communication module supplies power by the programmable power supply. The toggle switch SW1 is a single pole double throw switch, so that the control enabling pin of the switch module 200 has only two states:
VBUS_EN low level, DCIN_EN high level, switch module 1 on, switch module 2 off;
vbus_en high level, dcin_en low level, switch module 1 is turned off, and switch module 2 is turned on.
There is no case where the switching module 1 and the switching module 2 are simultaneously turned on. Meanwhile, the switch module 1 and the switch module 2 are of double PMOS design and have the backflow prevention function, so that the problem of backflow of voltage generated by the PMOS device due to the internal equivalent diode can be effectively avoided.
Specific switch control logic is shown in the following table:
the embodiment can realize the switching between the power supplies.
The invention also provides a power supply switching device, which comprises a circuit board and a power supply switching circuit, wherein the power supply switching circuit is arranged on the circuit board, and the structure of the power supply switching circuit can refer to the embodiment and is not repeated herein. It should be noted that, since the power supply switching device of the present embodiment adopts the technical scheme of the power supply switching circuit, the power supply switching device has all the beneficial effects of the power supply switching circuit.
The invention also provides a power supply switching system, which comprises a plurality of power supply sources and the power supply switching circuit, wherein the structure of the power supply switching circuit can refer to the embodiment and is not repeated herein. It should be noted that, since the power supply switching device of the present embodiment adopts the technical scheme of the power supply switching circuit, the power supply switching device has all the beneficial effects of the power supply switching circuit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or system that comprises the element. The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. A power supply switching circuit, wherein the power supply switching circuit is connected with a plurality of power supply sources; the circuit comprises a control module and a plurality of switch modules, wherein the input end of each switch module is correspondingly connected with the output end of one power supply, the output end of each switch module is used as the output end of the power supply switching circuit, and the control end of each power supply switching circuit is connected with one output end of the control module; wherein:
the control module is used for sending a communication signal to the switch module corresponding to the control instruction according to the control instruction;
and the switch module is used for outputting electric energy through a connected power supply when receiving the communication signal.
2. The power supply switching circuit according to claim 1, wherein the switching module includes a first switching tube and a backflow prevention unit; the input end of the first switching tube is used as the input end of the switching module, the output end of the first switching tube is connected with the input end of the backflow preventing unit, the output end of the backflow preventing unit is used as the output end of the switching module, and the control end of the first switching tube and the control end of the backflow preventing unit are used as the control end of the switching module.
3. The power switching circuit of claim 2, wherein the first switching tube is a PMOS tube, wherein: the input end of the first switching tube is the source electrode of the PMOS tube, the output end of the first switching tube is the drain electrode of the PMOS tube, and the control end of the first switching tube is the grid electrode of the PMOS tube.
4. The power supply switching circuit according to claim 2, wherein the backflow prevention unit includes a second switching tube; the input end of the second switching tube is used as the input end of the backflow preventing unit, the output end of the second switching tube is used as the output end of the backflow preventing unit, and the control end of the second switching tube is used as the control end of the backflow preventing unit; wherein: the second switching tube is a PMOS tube, the output end of the second switching tube is the source electrode of the PMOS tube, the input end of the second switching tube is the drain electrode of the PMOS tube, and the control end of the second switching tube is the grid electrode of the PMOS tube.
5. The power switching circuit according to claim 1, wherein the control module includes an instruction trigger unit and a signal unit; the input end of the signal unit is respectively connected with the output end of each power supply, the output end of the signal unit is connected with the instruction triggering unit, and the output end of the instruction triggering unit is used as the output end of the control module.
6. The power supply switching circuit according to claim 5, wherein the command triggering unit comprises a toggle switch, the toggle switch comprises a movable contact and a plurality of stationary contacts, each stationary contact is respectively connected with the control end of the switch module correspondingly, each stationary contact is also connected with the output end of the signal unit, and the movable contact is grounded.
7. The power supply switching circuit according to claim 5, wherein the signal unit includes a plurality of first resistors, first ends of the first resistors are connected to each other and to the output terminal of each of the power supplies, and second ends of the first resistors are respectively connected to the output terminal of the command triggering unit.
8. The power switching circuit according to claim 7, wherein said signal unit further comprises a plurality of second diodes, each of said second diodes being connected between an output of one of said power supplies and a first end of said first resistor, respectively; wherein:
the positive pole of the second diode is connected with the output end of the power supply, and the negative pole of the second diode is connected with the first end of the first resistor.
9. A power supply switching device, characterized in that the power supply switching device comprises a circuit board and the power supply switching circuit according to any one of claims 1 to 8, the power supply switching circuit being provided on the circuit board.
10. A power supply switching system comprising a plurality of power supply sources and the power supply switching circuit according to any one of claims 1 to 8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211612010.1A CN116191640A (en) | 2022-12-13 | 2022-12-13 | Power supply switching circuit, device and system |
| PCT/CN2023/118236 WO2024125000A1 (en) | 2022-12-13 | 2023-09-12 | Power supply switching circuit and apparatus, and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211612010.1A CN116191640A (en) | 2022-12-13 | 2022-12-13 | Power supply switching circuit, device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116191640A true CN116191640A (en) | 2023-05-30 |
Family
ID=86431677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211612010.1A Pending CN116191640A (en) | 2022-12-13 | 2022-12-13 | Power supply switching circuit, device and system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116191640A (en) |
| WO (1) | WO2024125000A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024125000A1 (en) * | 2022-12-13 | 2024-06-20 | 深圳市广和通无线股份有限公司 | Power supply switching circuit and apparatus, and system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203368132U (en) * | 2013-07-12 | 2013-12-25 | Tcl通力电子（惠州）有限公司 | Power switching circuit and dual-power supply device |
| JP6232968B2 (en) * | 2013-11-21 | 2017-11-22 | 株式会社ソシオネクスト | Power supply switching control circuit and power supply switching circuit |
| CN212033826U (en) * | 2020-03-11 | 2020-11-27 | 深圳绿米联创科技有限公司 | Power supply circuit and electronic device |
| CN217216077U (en) * | 2021-10-13 | 2022-08-16 | 深圳硕日新能源科技有限公司 | Anti-backflow switching device |
| CN116191640A (en) * | 2022-12-13 | 2023-05-30 | 深圳市广和通无线股份有限公司 | Power supply switching circuit, device and system |
-
2022
- 2022-12-13 CN CN202211612010.1A patent/CN116191640A/en active Pending
-
2023
- 2023-09-12 WO PCT/CN2023/118236 patent/WO2024125000A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024125000A1 (en) * | 2022-12-13 | 2024-06-20 | 深圳市广和通无线股份有限公司 | Power supply switching circuit and apparatus, and system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024125000A1 (en) | 2024-06-20 |
| WO2024125000A9 (en) | 2024-08-02 |
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