CN214069583U - Power supply self-switching device - Google Patents
Power supply self-switching device Download PDFInfo
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- CN214069583U CN214069583U CN202022054486.0U CN202022054486U CN214069583U CN 214069583 U CN214069583 U CN 214069583U CN 202022054486 U CN202022054486 U CN 202022054486U CN 214069583 U CN214069583 U CN 214069583U
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Abstract
The utility model discloses a power is from auto-change over device, include: the device comprises a first power supply path, a second power supply path, a BUCK voltage reduction module and a comparison control module; the path control end of the comparison control module controls the first power supply path to be conducted in a default mode, when the voltage of the divided power supply is larger than the voltage of the rear-stage power supply input end, the first power supply path is kept conducted, the BUCK voltage reduction module is enabled, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module; when the voltage of the power supply after voltage division is smaller than that of the rear-stage power supply input end, the second power supply path is conducted by the path control end of the comparison control module, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply path. The utility model provides a pair of power is from auto-change over device realizes when the product uses the scene only has low-power consumption to apply, directly adopts the low-voltage power supply, when the product uses the scene need cover the high-power consumption to apply, uses the high voltage as power input as required.
Description
Technical Field
The utility model relates to a power switches the field, concretely relates to power is from auto-change over device.
Background
The power consumption difference of partial products is huge under different application modes, but the existing circuit design generally adopts a fixed input voltage mode to carry out mainboard design. When a product selects a lower voltage level as power input, under a high-power-consumption application mode, the wire loss is large or the wire cost is high, and the output cost of the front-end power supply is obviously increased; when a product selects a higher voltage level as power input, although the wire loss and the wire cost in the whole scene can be reduced, power conversion is added in the product, efficiency loss exists to a certain degree, the duty ratio is high, and ripples are obvious. In addition, when a product designed by the scheme is used for secondary integration, power supply input cannot be flexibly selected according to a use scene because of fixed voltage input, and meanwhile, the cost of the whole machine is increased because the whole machine does not have the voltage grade and a power supply module is additionally added.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in providing a power is from auto-change over device, realizes when the product uses the scene to need cover the high-power consumption and use, can use the high voltage as power input, when the product uses the scene only has the low-power consumption to use, but auto-change over is for adopting the direct power supply of low-voltage.
In order to solve the technical problem, the embodiment of the present specification is implemented as follows:
in a first aspect, an embodiment of the present specification provides a power supply self-switching device, including: the device comprises a first power supply path, a second power supply path, a BUCK voltage reduction module and a comparison control module; the input ends of the first power supply path and the second power supply path are both connected with a power supply, the output end of the first power supply path is connected with the input end of the BUCK voltage reduction module, the BUCK control end of the first power supply path is connected with an enable pin of the BUCK voltage reduction module, and the output end of the BUCK voltage reduction module and the output end of the second power supply path are both connected with the input end of a rear-stage power supply; the comparison control module is respectively connected with the power supply and the rear-stage power supply input end, and the access control end of the comparison control module is respectively connected with the control pin of the first power supply access and the control pin of the second power supply access;
when the comparison control module judges that the voltage after the voltage division of the power supply is greater than the voltage of the rear-stage power supply input end, the access control end of the comparison control module enables the first power supply access to be conducted and the second power supply access to be disconnected, the BUCK control end of the first power supply access enables the BUCK voltage reduction module, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module;
when the comparison control module judges that the voltage of the divided power supply is smaller than that of the rear-stage power supply input end, the channel control end of the comparison control module enables the second power supply channel to be conducted and the first power supply channel to be disconnected, the BUCK control end of the first power supply channel cannot be enabled, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply channel.
Preferably, the comparison control module specifically includes: MOS pipe Q3, resistance R2, resistance R4, resistance R5 and resistance R6, MOS pipe Q3 ' S S utmost point passes through resistance R2 is connected with the back stage power supply input, MOS pipe Q3 ' S G utmost point passes through resistance R5 with the power is connected, MOS pipe Q3 ' S G utmost point still passes through resistance R6 ground connection, MOS pipe Q3 ' S D utmost point passes through resistance R4 ground connection, MOS pipe Q3 ' S D utmost point still with the access control end of comparison control module is connected.
Preferably, the first power supply path specifically includes: MOS pipe Q1, MOS pipe Q2, MOS pipe Q4, resistance R1 and resistance R3, MOS pipe Q1 the S utmost point with the power is connected, MOS pipe Q1 the D utmost point with the input of BUCK step-down module is connected, MOS pipe Q1 the G utmost point with MOS pipe Q2 ' S D utmost point is connected, MOS pipe Q2 ' S D utmost point passes through resistance R3 ground connection, MOS pipe Q2 ' S S utmost point is connected with the power, MOS pipe Q2 ' S G utmost point passes through resistance R1 is connected with the power, MOS pipe Q2 ' S G utmost point still with the BUCK control end of first power supply route is connected, MOS pipe Q4 ' S D utmost point with MOS pipe Q2 ' S G utmost point is connected, MOS pipe Q4 ' S G utmost point with the route control end of comparison control module is connected, MOS pipe Q4 ' S S utmost point ground connection.
Preferably, the second power supply path specifically includes: MOS pipe Q5, MOS pipe Q6 and resistance R8, MOS pipe Q5 ' S the S utmost point with the power is connected, MOS pipe Q5 ' S the D utmost point with the back stage power supply input is connected, MOS pipe Q5 ' S the G utmost point passes through resistance R8 is connected with the power, with MOS pipe Q6 ' S the D utmost point with MOS pipe Q5 ' S the G utmost point is connected, MOS pipe Q6 ' S the G utmost point with the access control end of comparison control module is connected, MOS pipe Q6 ' S the S utmost point ground connection.
Preferably, the BUCK voltage reducing module includes a BUCK chip, an inductor L1, and a capacitor C1, a fourth pin of the BUCK chip is connected to the BUCK control end of the first power supply path, a fifth pin of the BUCK chip is connected to the power supply, a sixth pin of the BUCK chip is connected to the rear-stage power supply input end through the inductor L1, a first pin of the BUCK chip is connected to the sixth pin of the BUCK chip through the capacitor C1, and a second pin of the BUCK chip is grounded; when the BUCK control end of the first power supply path is at a high level, enabling the BUCK chip, and reducing the power supply voltage to the voltage of a rear-stage power supply input end; and when the BUCK control end of the first power supply path is at a low level, the BUCK chip does not work.
In a second aspect, an embodiment of the present disclosure provides a power supply self-switching method, where the apparatus according to the first aspect is provided, where the method includes:
setting a path control end of a comparison control module, and controlling a first power supply path to be conducted and a second power supply path to be disconnected by default;
when the comparison control module judges that the voltage of the power supply after voltage division is larger than that of the rear-stage power supply input end, the access control end of the comparison control module keeps the first power supply access on and the second power supply access off, the BUCK control end of the first power supply access enables the BUCK voltage reduction module, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module;
when the comparison control module judges that the voltage of the divided power supply is smaller than that of the rear-stage power supply input end, the channel control end of the comparison control module enables the second power supply channel to be conducted and the first power supply channel to be disconnected, the BUCK control end of the first power supply channel cannot be enabled, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply channel.
The utility model has the advantages of as follows:
1. when high voltage is input, the path control end of the comparison control module enables the first power supply path to be conducted and the second power supply path to be disconnected, and the BUCK voltage reduction module converts the power supply voltage into voltage required by the rear end; when low voltage is input, the output voltage is slightly lower than the input voltage by utilizing the characteristics of the BUCK chip, the second power supply channel is conducted and the first power supply channel is disconnected by comparing the channel control end of the control module, and the power supply is directly supplied to the rear-end circuit at the moment, so that the voltage drop and the efficiency loss caused by the BUCK power supply are reduced;
2. the MOS tube and other separation devices are utilized, logic control is carried out by utilizing the BUCK circuit characteristic, no programmable device is needed to participate in the control process, power supply self-switching can be completed before the programmable device works and enables, self-switching self-adaption of the circuit is achieved, and the rear-end circuit is not sensed;
3. the self-switching of the power supply input of the main board can be realized at extremely low cost, and in product application or secondary integration, proper power supply input is selected according to power consumption requirements or the design of the power supply of the whole machine, manual rectification or selection is not needed, so that the usability of the product is improved, and the comprehensive use cost is reduced.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method performed by an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a comparative control module according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first power path circuit according to an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of a second power path according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of the BUCK voltage reducing module according to the embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present description without inventive step, shall fall within the scope of protection of the present application.
The utility model discloses an overall thinking is as follows:
the utility model discloses an utilize power self-switching scheme of BUCK chip characteristic, utilize logic design, mains voltage defaults to carry out voltage conversion through the BUCK chip, then through the comparative result of back level voltage and input voltage, selects optimum power supply route to realize when high voltage input, through the appropriate voltage level of BUCK chip conversion back-end circuit; when low voltage is input, the low voltage is directly supplied to a back-end circuit without a BUCK chip, and power loss caused by conversion efficiency during voltage conversion is reduced. When the product is only applied with low power consumption in the use scene, the low-voltage power supply can be directly adopted; when the use scene of the product needs to cover high-power-consumption application, the voltage input can be flexibly selected according to the requirement.
Referring to fig. 1, an embodiment of the present disclosure provides a power supply auto-switching device, including: the device comprises a first power supply path, a second power supply path, a BUCK voltage reduction module and a comparison control module; the input ends of the first power supply path and the second power supply path are both connected with a power supply, the output end of the first power supply path is connected with the input end of the BUCK voltage reduction module, the BUCK control end of the first power supply path is connected with an enable pin of the BUCK voltage reduction module, and the output end of the BUCK voltage reduction module and the output end of the second power supply path are both connected with the input end of a rear-stage power supply; the comparison control module is respectively connected with the Power supply and the rear-stage Power supply input end, and a path control end (for example, a control signal is Power _ IN _ EN) of the comparison control module is respectively connected with a control pin of a first Power supply path and a control pin of a second Power supply path;
when the comparison control module judges that the voltage after the voltage division of the power supply is greater than the voltage of the rear-stage power supply input end, a path control end (for example, a control signal is Buck _ EN) of the comparison control module enables the first power supply path to be conducted and the second power supply path to be disconnected, a BUCK control end of the first power supply path enables the BUCK voltage reduction module, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module;
when the comparison control module judges that the voltage of the divided power supply is smaller than that of the rear-stage power supply input end, the channel control end of the comparison control module enables the second power supply channel to be conducted and the first power supply channel to be disconnected, the BUCK control end of the first power supply channel cannot be enabled, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply channel.
And by using logic design, the supply voltage is subjected to voltage conversion by default through a BUCK chip, and the comparison control module controls to adopt a first power supply path or a second power supply path to be connected with the rear-stage power supply input end by judging the relation between the voltage obtained after the power supply is subjected to voltage division and the voltage of the rear-stage power supply input end. When high voltage is input, the comparison control module keeps the current power supply path unchanged after judging, and the voltage is converted into voltage required by the rear end by the BUCK voltage reduction module through the first power supply path; when low voltage is input, the BUCK power supply part is converted into corresponding voltage, the output voltage is slightly lower than the input voltage by using the characteristics of the BUCK chip, and after the output voltage is judged by the comparison control module, the power supply path is switched into a second power supply path to be directly supplied to the back-end circuit, so that the voltage drop and the efficiency loss brought by the BUCK power supply are reduced. The power supply self-switching can be completed before the programmable device works and enables without any programmable device in the control process, the self-switching self-adaption of the circuit is realized, and the post-stage circuit is not sensitive.
Referring to fig. 2, the comparison control module may specifically include: MOS pipe Q3 (for P-MOS pipe), resistance R2, resistance R4, resistance R5 and resistance R6, MOS pipe Q3 ' S S utmost point passes through resistance R2 is connected with the back stage power supply input end, MOS pipe Q3 ' S G utmost point passes through resistance R5 with the power is connected, MOS pipe Q3 ' S G utmost point still passes through resistance R6 ground connection, MOS pipe Q3 ' S D utmost point passes through resistance R4 ground connection, MOS pipe Q3 ' S D utmost point still with the access control end of comparison control module is connected.
The comparison control module of this embodiment adopts MOS pipe and a plurality of resistance, realizes the comparison to mains voltage and back level input end voltage, and is small, with low costs, can also adopt components and parts such as comparator to realize the function of the comparison control module of this embodiment. The G pole of the MOS tube Q3 is the voltage of the Power supply voltage Power _ IN after being divided by the R5 and the R6, when the G pole is larger than the voltage of the rear-stage Power supply input end + V5IN, the MOS tube Q3 is conducted, the D pole is low level, namely the access control end Power _ IN _ EN of the comparison control module is low level; when the voltage is less than the voltage + V5IN at the input end of the rear-stage Power supply, the MOS transistor Q3 is cut off, the D pole is high level, namely the Power _ IN _ EN of the access control end of the comparison control module is high level.
Referring to fig. 3, the first power path may specifically include: MOS transistor Q1, MOS transistor Q2, MOS transistor Q4, resistor R1 and resistor R3, wherein Q1 and Q2 are P-MOS transistors, and Q4 is an N-MOS transistor; the S utmost point of MOS pipe Q1 with the power is connected, the D utmost point of MOS pipe Q1 with the input of BUCK step-down module is connected, the G utmost point of MOS pipe Q1 with the D utmost point of MOS pipe Q2 is connected, the D utmost point of MOS pipe Q2 passes through resistance R3 ground connection, the S utmost point of MOS pipe Q2 is connected with the power, the G utmost point of MOS pipe Q2 passes through resistance R1 is connected with the power, the G utmost point of MOS pipe Q2 still with the BUCK control end of first power supply route is connected, the D utmost point of MOS pipe Q4 with the G utmost point of MOS pipe Q2 is connected, the G utmost point of MOS pipe Q4 with the route control end of comparison control module is connected, the S utmost point ground connection of MOS pipe Q4.
The access control end Power _ IN _ EN of the comparison control module is defaulted to be low level, so that the MOS tube Q4 is cut off, the MOS tube Q2 is also cut off, the MOS tube Q1 is conducted, the default control of the conduction of the first Power supply access is realized, and the input voltage can not cause the damage of a rear-end device when the high-voltage Power supply is prevented from being accessed to an application scene. When the path control end Power _ IN _ EN of the comparison control module is IN low level control and the first Power supply path is conducted, the BUCK control end Buck _ EN of the first Power supply path is IN high level, the BUCK voltage reduction module is enabled, and the purpose that high voltage of a Power supply is converted into appropriate rear-stage Power supply voltage is achieved. When the Power _ IN _ EN of the path control end of the comparison control module is converted into the high level, the MOS transistor Q4 is conducted, the BUCK control end BUCK _ EN of the first Power supply path is converted into the low level, and the BUCK voltage reduction module stops working.
Referring to fig. 4, the second power path may specifically include: the MOS transistor Q5, the MOS transistor Q6 and the resistor R8, wherein Q5 is a P-MOS transistor, and Q6 is an N-MOS transistor; the S utmost point of MOS pipe Q5 with the power is connected, the D utmost point of MOS pipe Q5 with back level power supply input end is connected, the G utmost point of MOS pipe Q5 passes through resistance R8 is connected with the power, with the D utmost point of MOS pipe Q6 with MOS pipe Q5 ' S G utmost point is connected, MOS pipe Q6 ' S G utmost point with the access control end of comparison control module is connected, MOS pipe Q6 ' S S utmost point ground connection.
When the access control end Power _ IN _ EN of the comparison control module is at a low level, the MOS transistor Q6 is cut off, so that the MOS transistor Q5 is also cut off, the second Power supply access is IN an open circuit state, and the Power supply voltage is connected with the back-end circuit through the second Power supply access and the BUCK voltage-reducing module; when the access control end Power _ IN _ EN of the comparison control module is at a high level, the MOS transistor Q6 is turned on, so that the MOS transistor Q5 is also turned on, and the Power supply voltage is directly connected to the back-end circuit, thereby reducing the voltage drop and the efficiency loss brought by the BUCK Power supply.
Referring to fig. 5, the BUCK voltage reducing module may include a BUCK chip (for example, a BUCK chip with a model number of SY 8113B), an inductor L1, and a capacitor C1, a fourth pin of the BUCK chip is connected to the BUCK control end of the first power path, a fifth pin of the BUCK chip is connected to the power supply, a sixth pin of the BUCK chip is connected to the rear-stage power input end through the inductor L1, a first pin of the BUCK chip is connected to the sixth pin of the BUCK chip through the capacitor C1, and a second pin of the BUCK chip is grounded; when the BUCK control end of the first power supply path is at a high level, enabling the BUCK chip, and reducing the power supply voltage to the voltage of a rear-stage power supply input end; and when the BUCK control end of the first power supply path is at a low level, the BUCK chip does not work. Other peripheral circuits of the BUCK chip can be arranged according to use requirements by utilizing the prior art.
When high voltage is input, the BUCK power supply part is converted into voltage required by the rear end through the power supply path switching part, and the comparison control module judges and keeps the default power supply path unchanged (namely the first power supply path is conducted and the second power supply path is cut off); when low voltage is input, the low voltage is converted into corresponding voltage through the BUCK power supply part through the power supply path switching part, at the moment, the comparison control module judges that the power supply voltage is directly connected with the rear-end circuit through the second power supply path by utilizing the characteristic that the output voltage of the BUCK chip is slightly lower than the input voltage, and meanwhile, the BUCK chip does not work.
The working principle of the embodiment of the specification is as follows:
setting a path control end of a comparison control module, and controlling a first power supply path to be conducted and a second power supply path to be disconnected by default;
when the comparison control module judges that the voltage of the power supply after voltage division is larger than that of the rear-stage power supply input end, the access control end of the comparison control module keeps the first power supply access on and the second power supply access off, the BUCK control end of the first power supply access enables the BUCK voltage reduction module, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module;
when the comparison control module judges that the voltage of the divided power supply is smaller than that of the rear-stage power supply input end, the channel control end of the comparison control module enables the second power supply channel to be conducted and the first power supply channel to be disconnected, the BUCK control end of the first power supply channel cannot be enabled, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply channel.
In the application scenario of the product, the voltage is often divided into several levels, for example: 3.3V, 5V, 9V, 12V, 19V, 24V, 36V, 48V, etc. In a specific application scenario, the preset conditions are as follows: the actual available voltage of the main board end is 5V, namely + V5IN is the actual available voltage of the back end circuit; power _ IN is Power supply input, and the preset optional input is 12V or 5V; the BUCK power supply sets the output voltage to be 5.1V;
in an initial state, setting a path control end of a comparison control module to be a low level, and controlling a first power supply path to be conducted and a second power supply path to be disconnected by default;
when Power _ IN is 12V input, Q1-G is low and Power _ IN _ EN is level, Q1 is on, Q4 is not on, existing + V12IN is 12V, Buck _ EN is high, enabling normal operation of Buck Power supply, + V5IN is 5.1V. At this time, Q3-S is 5V, Q3-G is 12V/2 is 6V, and Q3 is turned off, that is, Power _ IN _ EN is constantly at low level, and the operating state remains unchanged;
when Power _ IN is 5V input, Q1-G is low, and Power _ IN _ EN is low, Q1 is on, Q4 is not on, when + V12IN is 12V, Buck _ EN is high, Buck chip is on, and when input is equal to or lower than the set output requirement, the chip will modulate output at maximum duty ratio (generally 92%), and when + V5IN is 5V 92%, 4.6V. At this time, Q3-S is 4.6V, Q3-G is 5V/2 is 2.5V, and Q3 is turned on, that is, Power _ IN _ EN changes from low to high, and the operating state changes. When Power _ IN _ EN is changed to high level, Q6 and Q4 are conducted, Buck _ EN is low level, Q1 is closed, and Q5 is conducted, so that the Buck circuit has no input voltage, and the operation of the circuit is disabled. Then there is + V5 IN-5V.
The utility model realizes that when high voltage is input, the first power supply path is conducted and the second power supply path is disconnected by the path control end of the comparison control module, and the BUCK voltage reduction module converts the power supply voltage into the voltage required by the rear end; when low voltage is input, the output voltage is slightly lower than the input voltage by utilizing the characteristics of the BUCK chip, the second power supply channel is conducted and the first power supply channel is disconnected by comparing the channel control end of the control module, and the power supply is directly supplied to the rear-end circuit at the moment, so that the voltage drop and the efficiency loss caused by the BUCK power supply are reduced; the MOS tube and other separation devices are utilized, logic control is carried out by utilizing the BUCK circuit characteristic, no programmable device is needed to participate in the control process, power supply self-switching can be completed before the programmable device works and enables, self-switching self-adaption of the circuit is achieved, and the rear-end circuit is not sensed; the self-switching of the power supply input of the main board can be realized at extremely low cost, and in product application or secondary integration, proper power supply input is selected according to power consumption requirements or the design of the power supply of the whole machine, manual rectification or selection is not needed, so that the usability of the product is improved, and the comprehensive use cost is reduced.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (6)
1. A power supply self-switching apparatus, comprising: the device comprises a first power supply path, a second power supply path, a BUCK voltage reduction module and a comparison control module; the input ends of the first power supply path and the second power supply path are both connected with a power supply, the output end of the first power supply path is connected with the input end of the BUCK voltage reduction module, the BUCK control end of the first power supply path is connected with an enable pin of the BUCK voltage reduction module, and the output end of the BUCK voltage reduction module and the output end of the second power supply path are both connected with the input end of a rear-stage power supply; the comparison control module is respectively connected with the power supply and the rear-stage power supply input end, and the access control end of the comparison control module is respectively connected with the control pin of the first power supply access and the control pin of the second power supply access;
when the comparison control module judges that the voltage after the voltage division of the power supply is greater than the voltage of the rear-stage power supply input end, the access control end of the comparison control module enables the first power supply access to be conducted and the second power supply access to be disconnected, the BUCK control end of the first power supply access enables the BUCK voltage reduction module, and the power supply is connected with the rear-stage power supply input end through the BUCK voltage reduction module;
when the comparison control module judges that the voltage of the divided power supply is smaller than that of the rear-stage power supply input end, the channel control end of the comparison control module enables the second power supply channel to be conducted and the first power supply channel to be disconnected, the BUCK control end of the first power supply channel cannot be enabled, the BUCK voltage reduction module does not work, and the power supply is directly connected with the rear-stage power supply input end through the second power supply channel.
2. The power supply self-switching device according to claim 1, wherein: the comparison control module specifically comprises: MOS pipe Q3, resistance R2, resistance R4, resistance R5 and resistance R6, MOS pipe Q3 ' S S utmost point passes through resistance R2 is connected with the back stage power supply input, MOS pipe Q3 ' S G utmost point passes through resistance R5 with the power is connected, MOS pipe Q3 ' S G utmost point still passes through resistance R6 ground connection, MOS pipe Q3 ' S D utmost point passes through resistance R4 ground connection, MOS pipe Q3 ' S D utmost point still with the access control end of comparison control module is connected.
3. The power supply self-switching device according to claim 1, wherein: the first power supply path specifically includes: MOS pipe Q1, MOS pipe Q2, MOS pipe Q4, resistance R1 and resistance R3, MOS pipe Q1 the S utmost point with the power is connected, MOS pipe Q1 the D utmost point with the input of BUCK step-down module is connected, MOS pipe Q1 the G utmost point with MOS pipe Q2 ' S D utmost point is connected, MOS pipe Q2 ' S D utmost point passes through resistance R3 ground connection, MOS pipe Q2 ' S S utmost point is connected with the power, MOS pipe Q2 ' S G utmost point passes through resistance R1 is connected with the power, MOS pipe Q2 ' S G utmost point still with the BUCK control end of first power supply route is connected, MOS pipe Q4 ' S D utmost point with MOS pipe Q2 ' S G utmost point is connected, MOS pipe Q4 ' S G utmost point with the route control end of comparison control module is connected, MOS pipe Q4 ' S S utmost point ground connection.
4. The power supply self-switching device according to claim 1, wherein: the second power supply path specifically includes: MOS pipe Q5, MOS pipe Q6 and resistance R8, MOS pipe Q5 ' S the S utmost point with the power is connected, MOS pipe Q5 ' S the D utmost point with the back stage power supply input is connected, MOS pipe Q5 ' S the G utmost point passes through resistance R8 is connected with the power, with MOS pipe Q6 ' S the D utmost point with MOS pipe Q5 ' S the G utmost point is connected, MOS pipe Q6 ' S the G utmost point with the access control end of comparison control module is connected, MOS pipe Q6 ' S the S utmost point ground connection.
5. The power supply self-switching apparatus according to any one of claims 1 to 4, wherein: the BUCK voltage reduction module comprises a BUCK chip, an inductor L1 and a capacitor C1, a fourth pin of the BUCK chip is connected with a BUCK control end of the first power supply path, a fifth pin of the BUCK chip is connected with the power supply, a sixth pin of the BUCK chip is connected with the rear-stage power supply input end through the inductor L1, a first pin of the BUCK chip is connected with the sixth pin of the BUCK chip through the capacitor C1, and a second pin of the BUCK chip is grounded; when the BUCK control end of the first power supply path is at a high level, enabling the BUCK chip, and reducing the power supply voltage to the voltage of a rear-stage power supply input end; and when the BUCK control end of the first power supply path is at a low level, the BUCK chip does not work.
6. The power supply self-switching device according to claim 5, wherein: the model of the BUCK chip is SY 8113B.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152195A (en) * | 2020-09-18 | 2020-12-29 | 福建升腾资讯有限公司 | Power supply self-switching device and method |
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