CN112952988A - Power supply switching device for low-voltage priority control - Google Patents

Power supply switching device for low-voltage priority control Download PDF

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Publication number
CN112952988A
CN112952988A CN202110242348.1A CN202110242348A CN112952988A CN 112952988 A CN112952988 A CN 112952988A CN 202110242348 A CN202110242348 A CN 202110242348A CN 112952988 A CN112952988 A CN 112952988A
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China
Prior art keywords
control circuit
circuit module
power supply
voltage control
low
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Chinese (zh)
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黄能跃
廖嘉祥
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Xiamen Yealink Network Technology Co Ltd
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Xiamen Yealink Network Technology Co Ltd
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Priority to CN202110242348.1A priority Critical patent/CN112952988A/en
Publication of CN112952988A publication Critical patent/CN112952988A/en
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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
    • 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
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • 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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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power supply switching device for low-voltage priority control, which comprises a low-voltage control circuit module and a high-voltage control circuit module, wherein the low-voltage control circuit module is connected with the high-voltage control circuit module; the low-voltage control circuit module is used for controlling the conduction state of the internal devices of the high-voltage control circuit module in sequence by controlling the conduction state of the internal devices in sequence when only the first external input power supply is input independently so as to enable the power supply switching device to disconnect the second external input power supply from the system power supply; the high-voltage control circuit module is used for controlling the conduction state of the internal devices of the low-voltage control circuit module sequentially by controlling the conduction state of the internal devices sequentially when only the second external input power supply is input independently, so that the power supply switching device is disconnected from the first external input power supply and the system power supply. The invention realizes the input power switching function through the simple combination of the triode and the MOS tube, reduces the product cost and improves the convenience and the reliability of power switching.

Description

Power supply switching device for low-voltage priority control
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a power supply switching device for low-voltage priority control.
Background
The existing power supply control technology mainly switches the voltage of a system to another low-voltage power supply when the system is detected to have larger voltage fluctuation of a main power supply of the system or needs to enter a low-power consumption state in the normal operation of the system, thereby ensuring the stability and the power consumption economy of the system.
However, in the course of research and practice on the prior art, the inventor of the present invention found that the prior art has some disadvantages, such as the need to rely on a comparator circuit and software to determine the system voltage status to implement power supply switching. However, the method cannot realize the selection of the power supply voltage when the system is powered on, namely, the method cannot adapt to the wide voltage input starting system, and in addition, software factors are additionally introduced, so that the reliability of the whole power supply switching system is reduced. Therefore, a power switching device with low-voltage priority control is needed to solve the above-mentioned drawbacks.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a power switching apparatus for low voltage priority control, which can realize an input power switching function through a simple combination of a triode and an MOS transistor.
In order to solve the above problem, a first aspect of an embodiment of the present application provides a power switching apparatus for low voltage priority control, including a low voltage control circuit module and a high voltage control circuit module; wherein the content of the first and second substances,
the low-voltage control circuit module is used for controlling the conduction states of a second triode, a third triode and a second MOS tube of the high-voltage control circuit module in sequence by controlling the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module in sequence when only a first external input power supply is input independently, so that the power supply switching device is enabled to disconnect the second external input power supply from a system power supply;
the high-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module sequentially when only the second external input power supply is input independently, so that the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module are controlled sequentially, and the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
In a possible implementation manner of the first aspect, the power switching apparatus for low-voltage priority control further includes:
when the first external input power supply and the second external input power supply are simultaneously output, the first triode of the low-voltage control circuit module is controlled to be in a saturation conducting state, the first MOS tube is in a conducting state, the second triode of the high-voltage control circuit module is controlled to be in a saturation conducting state, the third triode is in a cut-off state, the second MOS tube is in a cut-off state, the cut-off time of the second MOS tube is faster than that of the first MOS tube, and therefore the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
In a possible implementation manner of the first aspect, when only the first external input power is input alone, the conduction states of the first triode and the first MOS transistor of the low-voltage control circuit module are controlled sequentially, so that the conduction states of the second triode, the third triode, and the second MOS transistor of the high-voltage control circuit module are controlled sequentially, specifically:
sequentially controlling a first triode of the low-voltage control circuit to be in a saturation conduction state, and controlling a first MOS (metal oxide semiconductor) tube to be in a conduction state; and successively controlling a second triode of the high-voltage control circuit module to be in a saturation conducting state, a third triode to be in a cut-off state and a second triode to be in a cut-off state.
In a possible implementation manner of the first aspect, when only the second external input power is input separately, the conduction states of the second triode, the third triode, and the second MOS transistor of the high-voltage control circuit module are controlled sequentially, so that the conduction states of the first triode and the first MOS transistor of the low-voltage control circuit module are controlled sequentially, specifically:
sequentially controlling a second triode of the high-voltage control circuit module to be in a cut-off state, a third triode to be in a saturation conduction state and a second MOS tube to be in a conduction state; and sequentially controlling a first triode of the low-voltage control circuit module to be in a cut-off state, and controlling a first MOS (metal oxide semiconductor) tube to be in a cut-off state.
In a possible implementation manner of the first aspect, a first end of the low-voltage control circuit module is connected to a first end of the high-voltage control circuit module, a second end and a fourth end of the low-voltage control circuit module are respectively connected to a first external input power supply, and a third end of the low-voltage control circuit module is connected to a second external input power supply; the second end of the high-voltage control circuit module is connected with a system power supply, the third end and the fourth end of the high-voltage control circuit module are respectively connected with a second external input power supply, and the fifth end of the high-voltage control circuit module is connected with a first external input power supply.
In one possible implementation manner of the first aspect, a voltage of the first external input power supply is lower than a voltage of the second external input power supply.
In a possible implementation manner of the first aspect, the first external input power is input through a TYPE C interface, and the second external input power is input through a customized interface.
In a possible implementation manner of the first aspect, power is preferentially supplied through the TYPE C interface.
In a possible implementation manner of the first aspect, the power switching apparatus for low-voltage priority control further includes:
and when the first external input power supply is accessed, the second MOS tube is controlled to be firstly switched off and then the first MOS tube is switched on.
In a possible implementation manner of the first aspect, the power switching apparatus for low-voltage priority control further includes:
when only the second external input power supply is independently input, the second MOS tube is started after the first MOS tube is controlled to be turned off by the low-voltage control circuit module.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a power supply switching device for low-voltage priority control, which comprises a low-voltage control circuit module and a high-voltage control circuit module; the low-voltage control circuit module is used for controlling the conduction states of a second triode, a third triode and a second MOS tube of the high-voltage control circuit module in sequence by controlling the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module in sequence when only a first external input power supply is input independently, so that the power supply switching device is enabled to disconnect the second external input power supply from a system power supply; the high-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module sequentially when only the second external input power supply is input independently, so that the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module are controlled sequentially, and the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
Compared with the prior art, the embodiment of the invention can realize the accurate switching function of the input power supply through the simple combination of the triode and the MOS tube, realize the automatic switching of the voltage of the input power supply only by depending on the logic of a hardware circuit when the system is powered on, ensure that the system can be stably started no matter which voltage is input, automatically switch the voltage of the system to low voltage for power supply, ensure the stability and power consumption economy of the system, avoid the situation that a high voltage power supply flows back to the low voltage power supply, reduce the product cost and improve the convenience and reliability of power supply switching.
Drawings
Fig. 1 is a schematic circuit diagram of a power switching apparatus for low voltage priority control according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a connection between a host system and a power input interface according to a first embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Firstly, the application scenario that the invention can provide is introduced, for example, the input power switching function realized by a complex chip is realized by utilizing the simple combination of a triode and an MOS tube, so that in the normal operation of the system, when the situation that the voltage fluctuation of a main power supply of the system is large or the system needs to enter a low power consumption state is detected, the voltage of the system is automatically switched to another low voltage for power supply, and the stability and the power consumption economy of the system are ensured.
The first embodiment of the present invention:
please refer to fig. 1-2.
The embodiment provides a power supply switching device for low-voltage priority control, which comprises a low-voltage control circuit module and a high-voltage control circuit module; wherein the content of the first and second substances,
the low-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module in sequence by controlling the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module in sequence when only the first external input power supply is input independently, so that the power supply switching device is enabled to disconnect the second external input power supply from the system power supply.
In a preferred embodiment, when only the first external input power is input alone, the conduction states of the second triode, the third triode and the second MOS transistor of the high-voltage control circuit module are controlled sequentially by sequentially controlling the conduction states of the first triode and the first MOS transistor of the low-voltage control circuit module, which specifically includes:
sequentially controlling a first triode of the low-voltage control circuit to be in a saturation conduction state, and controlling a first MOS (metal oxide semiconductor) tube to be in a conduction state; and successively controlling a second triode of the high-voltage control circuit module to be in a saturation conducting state, a third triode to be in a cut-off state and a second triode to be in a cut-off state.
Specifically, the present embodiment may be divided into two control modules, one of which is low voltage line switch control, as shown in fig. 1, and part of which mainly controls low voltage input logic. When only 5V is input or 5V and 12V are input simultaneously, the switch Q1 needs to be opened to let 5V equal to VIN, and Q2 is turned off to protect the low-voltage side power supply from the risk of current backflow.
The specific control logic of the low-voltage line switch control is as follows: when 5V is input alone, the source level of the transistor Q1 is substantially equal to 5V due to the parasitic diode in the transistor Q1, the transistor Q2 is in a saturated conducting state, the gate of the transistor Q1 is pulled to 0V, the transistor Q1 is turned on, and VIN is 5V. In addition, in the circuit for controlling the 12V input, the triode Q5 is in saturated conduction, the crossing point level of the R5 and the R6 is 0V, at the moment, the triode Q4 is in a cut-off state, the grid level of the MOS transistor Q3 is pulled up by the R4 to be consistent with the source level, the Q3 is in a cut-off state, and the 12V input is disconnected from VIN.
The high-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module sequentially when only the second external input power supply is input independently, so that the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module are controlled sequentially, and the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
In a preferred embodiment, when only the second external input power is input alone, the conduction states of the second triode, the third triode and the second MOS transistor of the high-voltage control circuit module are controlled sequentially, so that the conduction states of the first triode and the first MOS transistor of the low-voltage control circuit module are controlled sequentially, specifically:
sequentially controlling a second triode of the high-voltage control circuit module to be in a cut-off state, a third triode to be in a saturation conduction state and a second MOS tube to be in a conduction state; and sequentially controlling a first triode of the low-voltage control circuit module to be in a cut-off state, and controlling a first MOS (metal oxide semiconductor) tube to be in a cut-off state.
Specifically, for the switch control section of the high voltage line, the high voltage input is mainly controlled. When only 12V input is available, Q3 is turned on, and Q1 is turned off, so that the situation that 12V is filled to a low voltage position is prevented, and the system is always in a switching power supply and cannot work normally is avoided.
Specifically, the specific control logic for the high-voltage line switch control is as follows: when 12V is input alone, since 5V has no input power, the level of the B pole of the transistor Q5 is 0V, Q5 is in a cut-off state, and at this time, the transistor Q4 is in a saturation conducting state, the level of the G pole of the MOS transistor Q3 is pulled down to 0V, the GS level of Q3 reaches the turn-on voltage, Q3 is in a conducting state, VIN is 12V, and the transistor Q2 is in a cut-off state, the level of the G pole of the MOS transistor Q1 is pulled up to 12V, and the voltage of VIN is consistent, at this time, the MOS transistor Q1 is in a cut-off state, and the 5V input is disconnected from VIN.
In a preferred embodiment, the power switching apparatus for low voltage priority control further includes:
when the first external input power supply and the second external input power supply are simultaneously output, the first triode of the low-voltage control circuit module is controlled to be in a saturation conducting state, the first MOS tube is in a conducting state, the second triode of the high-voltage control circuit module is controlled to be in a saturation conducting state, the third triode is in a cut-off state, the second MOS tube is in a cut-off state, the cut-off time of the second MOS tube is faster than that of the first MOS tube, and therefore the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
Specifically, when 12V and 5V are input simultaneously, the MOS transistor Q1 has a parasitic diode therein, so that the S-pole level of the transistor Q1 is substantially equal to 5V, the transistor Q2 is in a saturated conduction state, the G-pole of the MOS transistor Q1 is pulled to 0V, the transistor Q1 is turned on, and VIN is 5V. In addition, in the circuit for controlling 12V input, the triode Q5 is in saturated conduction, the level of the intersection point of the R5 and the R6 is 0V, at the moment, the triode Q4 is in a cut-off state, the level of the G pole of the MOS transistor Q3 is pulled up by the R4 to be consistent with the level of the S pole, the Q3 is in a cut-off state, and the 12V input is disconnected from the VIN, so that the 5V input priority power supply is realized, and the 5V power supply is protected from being reversely poured by the 12V.
In a preferred embodiment, a first end of the low-voltage control circuit module is connected with a first end of the high-voltage control circuit module, a second end and a fourth end of the low-voltage control circuit module are respectively connected to a first external input power supply, and a third end of the low-voltage control circuit module is connected to a second external input power supply; the second end of the high-voltage control circuit module is connected with a system power supply, the third end and the fourth end of the high-voltage control circuit module are respectively connected with a second external input power supply, and the fifth end of the high-voltage control circuit module is connected with a first external input power supply.
Specifically, as shown in fig. 1, the low voltage control circuit module includes a first MOS transistor Q1, a first transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and an eighth resistor R8; the drain of the first MOS transistor Q1 is connected to the first external input power supply (5V), the source of the first MOS transistor Q1 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to one end of the high voltage control circuit module; the grid of the first MOS transistor Q1 is respectively connected with the first end of the first resistor R1 and the collector of the first triode Q2, the second end of the first resistor R1 is connected with a second external input power supply (12V), the base of the first triode Q2 is respectively connected with the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the second resistor R2 is connected with the first external input power supply (5V), and the emitter of the first triode Q2 is connected with the second end of the third resistor R3 and is grounded.
The high-voltage control circuit module comprises a second triode Q5, a third triode Q4, a second MOS transistor Q3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a ninth resistor R9, a first capacitor C1, a second capacitor C2 and a third capacitor C3; wherein, the base of the second triode Q5 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor is connected to the first external input power source (5V), the emitter of the second triode Q5 is grounded, the collector of the second triode Q5 is connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6 respectively, the second end of the fifth resistor R5 is connected to the second external input power source (12V), the second end of the sixth resistor R6 is connected to the base of the third triode Q4, the emitter of the third triode Q4 is grounded, the collector of the third triode Q4 is connected to the first end of the fourth resistor R4, the first end of the first capacitor C1 and the gate of the second MOS transistor Q3 respectively, the second external input power source (12V) is further connected to the second end of the fourth resistor R4, the second end of the first capacitor C1, the source of the second MOS transistor Q353527, the first end of the first capacitor R3527 and the second end of the second MOS transistor Q4, the drain of the second MOS transistor Q3 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is connected to the second end of the eighth resistor R8 and the first end of the second capacitor C2, respectively, and the first end of the second capacitor C2 is further connected to the first end of the third capacitor C3 and a system power supply (VIN); the second terminal of the second capacitor C2 is grounded, the first terminal of the third capacitor C3 is further connected to a system power supply (VIN), and the second terminal of the third capacitor C3 is grounded.
In a preferred embodiment, the voltage of the first external input power source is lower than the voltage of the second external input power source.
Specifically, the first external input power source is a low voltage with respect to the second external input voltage, and the second external input power source is a high voltage with respect to the first external input power source.
In a preferred embodiment, the first external input power is input through a TYPE C interface, and the second external input power is input through a customized interface.
In a preferred embodiment, power is preferentially supplied through the TYPE C interface.
Specifically, as shown in fig. 2, the main system has two power input interfaces, a first external input power (5V power) is input through the TYPE C interface, and a second external input power (12V power) is input through the custom interface. Since the TYPE C interface is a relatively common interface, the system is designed to preferentially supply power to the system through the TYPE C interface.
In a preferred embodiment, the power switching apparatus for low voltage priority control further includes:
and when the first external input power supply is accessed, the second MOS tube is controlled to be firstly switched off and then the first MOS tube is switched on.
In particular, the key point of the circuit that can realize the automatic switches Q1 and Q3 is the time difference between the on and off of the two MOS transistors. The method comprises the following specific steps: it is necessary to ensure that Q3 turns off first and Q1 turns on again whenever there is a 5V power input, and that Q1 turns off first and Q3 turns on again when there is only a 12V input. Namely, under the condition of 5V input, parameters of R6 and R7 are adjusted to accelerate the on-time of Q5, and parameters of R2 and R3 are adjusted to slow down the on-time of Q2, so that the G pole of Q3 is controlled not to be pulled down by Q4, Q3 can be rapidly turned off, after the Q3 is turned off, Q2 can be turned on to turn on Q1, and the system supplies power normally.
In a preferred embodiment, the power switching apparatus for low voltage priority control further includes:
when only the second external input power supply is independently input, the second MOS tube is started after the first MOS tube is controlled to be turned off by the low-voltage control circuit module.
Specifically, under the condition of only 12V input, since the B pole of Q2 has the R3 resistor pulled low and is not turned on, and Q4 is turned on by 12V input, and the G pole of Q2 is pulled low, and due to the presence of C1, the on-time of Q3 is slowed down, when Q3 is slightly turned on, VIN is 5V < VIN <12V, at this time, the G pole of Q1 is pulled high by R1, GS does not reach the threshold voltage of on and is not turned on, so that Q1 is in the off state, and Q3 is slowly turned on, and finally VIN is 12V. Through triode and MOS pipe time difference when switching on come the switching of two input power of accurate management and control, under the circumstances that has 5V and 12V input simultaneously, guarantee that MOS pipe Q3's off-time is faster than MOS pipe Q1's on-time, otherwise can appear 12V and flow backward to 5V power, with the condition of 5V power damage.
The power switching device for low-voltage priority control provided by the embodiment comprises a low-voltage control circuit module and a high-voltage control circuit module; the low-voltage control circuit module is used for controlling the conduction states of a second triode, a third triode and a second MOS tube of the high-voltage control circuit module in sequence by controlling the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module in sequence when only a first external input power supply is input independently, so that the power supply switching device is enabled to disconnect the second external input power supply from a system power supply; the high-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module sequentially when only the second external input power supply is input independently, so that the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module are controlled sequentially, and the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
Compared with the prior art, this embodiment can realize the accurate switching function of input power through the simple combination of triode and MOS pipe, only rely on hardware circuit logic to realize the automatic switch-over of input power supply voltage when the system is electrified, guarantee that no matter which voltage input of system can both stably start, thereby automatically switch the voltage of system to the low-voltage power supply, thereby guarantee the stability and the consumption economy of system, and avoid appearing the condition that high-voltage power source flows backward to low-voltage power supply, reduce product cost, improve the convenience and the reliability that the power switches.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules may be a logical division, and in actual implementation, there may be another division, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

Claims (10)

1. A power supply switching device for low-voltage priority control is characterized by comprising a low-voltage control circuit module and a high-voltage control circuit module; wherein the content of the first and second substances,
the low-voltage control circuit module is used for controlling the conduction states of a second triode, a third triode and a second MOS tube of the high-voltage control circuit module in sequence by controlling the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module in sequence when only a first external input power supply is input independently, so that the power supply switching device is enabled to disconnect the second external input power supply from a system power supply;
the high-voltage control circuit module is used for controlling the conduction states of the second triode, the third triode and the second MOS tube of the high-voltage control circuit module sequentially when only the second external input power supply is input independently, so that the conduction states of the first triode and the first MOS tube of the low-voltage control circuit module are controlled sequentially, and the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
2. The power switching apparatus for low voltage priority control according to claim 1, further comprising:
when the first external input power supply and the second external input power supply are simultaneously output, the first triode of the low-voltage control circuit module is controlled to be in a saturation conducting state, the first MOS tube is in a conducting state, the second triode of the high-voltage control circuit module is controlled to be in a saturation conducting state, the third triode is in a cut-off state, the second MOS tube is in a cut-off state, the cut-off time of the second MOS tube is faster than that of the first MOS tube, and therefore the power supply switching device is enabled to disconnect the first external input power supply from the system power supply.
3. The power switching device according to claim 1, wherein when only a first external input power is input alone, the conduction states of the second transistor, the third transistor, and the second MOS transistor of the high-voltage control circuit module are controlled sequentially by sequentially controlling the conduction states of the first transistor and the first MOS transistor of the low-voltage control circuit module, specifically:
sequentially controlling a first triode of the low-voltage control circuit to be in a saturation conduction state, and controlling a first MOS (metal oxide semiconductor) tube to be in a conduction state; and successively controlling a second triode of the high-voltage control circuit module to be in a saturation conducting state, a third triode to be in a cut-off state and a second triode to be in a cut-off state.
4. The power switching device according to claim 1, wherein when only a second external input power is separately input, the conduction states of the second transistor, the third transistor, and the second MOS transistor of the high-voltage control circuit module are sequentially controlled, so as to sequentially control the conduction states of the first transistor and the first MOS transistor of the low-voltage control circuit module, specifically:
sequentially controlling a second triode of the high-voltage control circuit module to be in a cut-off state, a third triode to be in a saturation conduction state and a second MOS tube to be in a conduction state; and sequentially controlling a first triode of the low-voltage control circuit module to be in a cut-off state, and controlling a first MOS (metal oxide semiconductor) tube to be in a cut-off state.
5. The power switching device for low-voltage priority control according to claim 1, wherein a first terminal of the low-voltage control circuit module is connected to a first terminal of the high-voltage control circuit module, a second terminal and a fourth terminal of the low-voltage control circuit module are respectively connected to a first external input power source, and a third terminal of the low-voltage control circuit module is connected to the second external input power source; the second end of the high-voltage control circuit module is connected with a system power supply, the third end and the fourth end of the high-voltage control circuit module are respectively connected with a second external input power supply, and the fifth end of the high-voltage control circuit module is connected with a first external input power supply.
6. The power switching apparatus for low voltage priority control according to claim 5, wherein the voltage of the first external input power source is lower than the voltage of the second external input power source.
7. The power switching apparatus according to claim 6, wherein the first external input power is input through a TYPE C interface, and the second external input power is input through a custom interface.
8. The power switching device for low voltage priority control of claim 7, wherein power is preferentially supplied through the TYPE C interface.
9. The power switching apparatus for low voltage priority control according to claim 1, further comprising:
and when the first external input power supply is accessed, the second MOS tube is controlled to be firstly switched off and then the first MOS tube is switched on.
10. The power switching apparatus for low voltage priority control according to claim 1, further comprising:
when only the second external input power supply is independently input, the second MOS tube is started after the first MOS tube is controlled to be turned off by the low-voltage control circuit module.
CN202110242348.1A 2021-03-04 2021-03-04 Power supply switching device for low-voltage priority control Pending CN112952988A (en)

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Application Number Priority Date Filing Date Title
CN202110242348.1A CN112952988A (en) 2021-03-04 2021-03-04 Power supply switching device for low-voltage priority control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110242348.1A CN112952988A (en) 2021-03-04 2021-03-04 Power supply switching device for low-voltage priority control

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CN112952988A true CN112952988A (en) 2021-06-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114572127A (en) * 2022-03-16 2022-06-03 宁波兴为汽车电子有限公司 Multimode automobile body power supply control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114572127A (en) * 2022-03-16 2022-06-03 宁波兴为汽车电子有限公司 Multimode automobile body power supply control system
CN114572127B (en) * 2022-03-16 2023-07-25 宁波兴为汽车电子有限公司 Multimode automobile body power supply control system

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