CN104377812A - Switching circuit for multiple input power sources - Google Patents
Switching circuit for multiple input power sources Download PDFInfo
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- CN104377812A CN104377812A CN201410700845.1A CN201410700845A CN104377812A CN 104377812 A CN104377812 A CN 104377812A CN 201410700845 A CN201410700845 A CN 201410700845A CN 104377812 A CN104377812 A CN 104377812A
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Abstract
The invention discloses a switching circuit for multiple input power sources. The switching circuit for the multiple input power sources comprises a second power source input detection circuit, a third power source input detection circuit, a first power source voltage output switch circuit and a second power source voltage output switch circuit, wherein the input ends of the second power source input detection circuit and the third power source input detection circuit are connected with the second power source and the third power source in a one-to-one correspondence mode, the output end of the second power source input detection circuit is connected with a control end of the second power source voltage output switch circuit, the output end of the third power source input detection circuit is connected with the control end of the second power source input detection circuit, and the control end of the first power source voltage output switch circuit is connected with the second power source and the third power source. According to the switching circuit for the multiple input power sources, independent electronic elements are used for setting up a circuit, the power source with a higher priority can be automatically switched to for power supply according to the priority, the switching circuit does not need to be connected with an external control device, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of multi input power supply switch circuit, specifically, relate to a kind of priority orders according to input power automatic switchover supply.
Background technology
Electronic equipment operationally, in order to reach the longer operating time, or in order to various operational environment can be applicable to, the power pack of usual electronic equipment, except design becomes the lithium battery that can use and carry in electronic equipment, also by outside USB port, or special external adapter etc. is powered, have at least three-way power like this can power, and three-way power has certain power supply priority level, when to access two-way or two-way with power source simultaneously, the problem that power supply switches will be there is.
Current two-way electrical source exchange is the most common, realize also simple, but this kind of switching mode is only limitted to the switching realizing two-way power supply, cannot transplant or copy in the above electrical source exchange of two-way.
The normal mode adopting switch socket is switched for three road input powers, the interface connecing outside storage battery at equipment establishes a mechanical contact-type switch, when outside storage battery plug inserts apparatus socket, this switch can be touched, the contact of this switch connects internal battery, thus reaching the effect of breaking inner battery, the priority achieving power supply switches.This mode is when external cell exhausts, and the automatic switchover that can not realize internal cell is powered, and is not real three road automatic switch-over circuits.
Another three road input power switching mode, by arranging multiple switch element, each switch element has preset priority different from, all be connected with external control device in each switch element, for receiving the control signal from external control device, with the break-make of control switch unit, multiple power supply and switch element one_to_one corresponding, and then the automatic switchover realized three road input powers, but, this switching mode is transmitted control signal by external control device and carries out control realization, need the control pin taking external control device, when pin has in limited time, switching controls cannot be realized, or need to increase device cost, the external control device with abundant control pin is selected to realize, and, the reliability controlled places one's entire reliance upon the running status of control device, when control device crashes or program enters endless loop, the pin of control device can be caused to export single level, when institute's switch element is open mode, preferred sequence is caused to be lost, cannot power according to correct mode.
Summary of the invention
The present invention can not realize automatically switching to solve existing multi input power supply switch circuit, or switching needs take control device pin and switch insecure technical problem, proposes a kind of multi input power supply switch circuit, can solve the problem.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of multi input power supply switch circuit, comprise the second source input detecting circuit for detecting second source input, for detecting the 3rd mains input detection circuit of the input of the 3rd power supply, first supply voltage output switch circuit, and second source voltage output switch circuit, the input of described second source input detecting circuit and the 3rd mains input detection circuit connects one to one with second source and the 3rd power supply respectively, the output of described second source input detecting circuit is connected with the control end of described second source voltage output switch circuit, open or close the output of second source voltage for controlling second source voltage output switch circuit, the output of described 3rd mains input detection circuit is connected with the control end of described second source input detecting circuit, for controlling the conducting state of described second source input detecting circuit, the control end of described first supply voltage output switch circuit is connected with described second source and the 3rd power supply respectively, open or close the first supply voltage output for controlling the first supply voltage output switch circuit.
Further, described first supply voltage output switch circuit comprises the first PMOS, the drain electrode of described first PMOS is connected with the first power supply, and the source electrode of described first PMOS is connected with voltage output end, is connected after grid connection the 5th resistance of described first PMOS with ground end.
Further, the first diode is also parallel with between the drain electrode of the first described PMOS and source electrode.
Further, described second source voltage output switch circuit comprises the second PMOS, the source electrode of described second PMOS is connected with second source, the drain electrode of described second PMOS is connected with described voltage output end, and the grid of described second PMOS is connected with the output of second source input detecting circuit.
Further, the 3rd resistance is also connected with between the source electrode of described second PMOS and grid.
Further, described second source input detecting circuit comprises the first bleeder circuit and the first NMOS tube, the input of described first bleeder circuit is connected with second source, the output of described first bleeder circuit is connected with the grid of described first NMOS tube, the source electrode of described first NMOS tube is connected with the grid of described second PMOS, be connected with ground end after drain electrode connection the 4th resistance of described first NMOS tube, the grid of described first PMOS is connected with second source.
Further, described 3rd mains input detection circuit comprises the second bleeder circuit, the input of described second bleeder circuit is connected with the 3rd power supply, and the output of described second bleeder circuit is connected with the drain electrode of described first NMOS tube, and the 3rd power supply is connected with described voltage output end.
Further, described first bleeder circuit comprises the first resistance and the second resistance that are in series, described first resistance is connected with second source, described second resistance connects earth terminal, the grid of described first NMOS tube is connected between described first resistance and the second resistance, described second bleeder circuit comprises the 6th resistance and the 7th resistance that are in series, and to drain the 4th resistance be connected with the first NMOS tube, described 6th resistance is connected with the 3rd power supply, described 7th resistance connects earth terminal, described 4th resistance is connected with the first NMOS tube drain electrode, the drain electrode of described first NMOS tube is connected between described 6th resistance and the 7th resistance, the ratio of the resistance of described 7th resistor coupled in parallel the 4th resistance and the 6th resistance is greater than the ratio of the resistance of described second resistance and the first resistance, the grid of described first PMOS is connected with the 3rd power supply simultaneously.
Further, described multi input power supply switch circuit also comprises double diode, described second source is connected by the grid of described double diode with described first PMOS with the 3rd power supply, two inputs of described double diode are connected with described second source and the 3rd power supply respectively, and the output of described double diode is connected with the grid of described first PMOS.
Further, be connected with the second diode between the drain electrode of the second PMOS and voltage output end, the described 3rd is connected with the 4th diode between power supply and voltage output end.
Compared with prior art, advantage of the present invention and good effect are: multi input power supply switch circuit of the present invention, circuit is built by adopting discrete electronic device, by the highest for the priority of the 3rd power supply, the priority of the first power supply is minimum, when inserting second source or the 3rd power supply, the high Power supply of priority can be automatically switched to according to priority, without the need to connecting external control device, do not take the pin of external control device, and correctly can select according to priority level the running status not relying on control device, if by the 3rd power supply, second source, first power supply is respectively adapter input power, USB input power, and carry the words of battery supply, then the priority of adaptor power supplies is the highest, the priority carrying battery supply is minimum, saving battery electric quantity can also be reached, the object of lengthening working hours.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the functional-block diagram of a kind of embodiment of multi input power supply switch circuit proposed by the invention;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of multi input power supply switch circuit proposed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one, the present embodiment proposes a kind of multi input power supply switch circuit, as shown in Figure 1, comprise second source input detecting circuit, 3rd mains input detection circuit, first supply voltage output switch circuit, and second source voltage output switch circuit, the input of described second source input detecting circuit and the 3rd mains input detection circuit connects one to one with second source V2 and the 3rd power supply V3 respectively, the output of described second source input detecting circuit is connected with the control end of described second source voltage output switch circuit, open or close the output of second source voltage for controlling second source voltage output switch circuit, the output of described 3rd mains input detection circuit is connected with the control end of described second source input detecting circuit, for controlling the conducting state of described 3rd mains input detection circuit, the control end of described first supply voltage output switch circuit is connected with described second source V2 and the 3rd power supply V3 respectively, open or close the first supply voltage output for controlling the first supply voltage output switch circuit.Whether described second source input detecting circuit has voltage to input for detecting second source V2, whether the 3rd mains input detection circuit has voltage to input for detecting the 3rd power supply V3, the multi input power supply switch circuit of the present embodiment, the power supply priority of the 3rd power supply V3 is the highest, the power supply priority of the first power supply V1 is minimum, when only having the first power supply V1 to input, second source input detecting circuit and the 3rd mains input detection circuit all can't detect power supply input, therefore second source voltage output switch circuit controls to close the output of second source voltage, first supply voltage output switch circuit conducting, be that equipment is powered by the first power supply V1.When having the first power supply V1 and second source V2 to input simultaneously, second source input detecting circuit has detected that power supply inputs, now control second source voltage output switch circuit and open the output of second source voltage, second source V2 powers, the control end of the first supply voltage output switch circuit is connected with described second source simultaneously, therefore, when second source V2 has voltage to input, the first supply voltage output switch circuit is closed, and now the first power supply V1 does not power.When the 3rd power supply V3 has input, if at least one of simultaneously the first power supply V1 and second source V2 also has voltage to input, now, 3rd mains input detection circuit has detected that power supply V3 inputs, the closedown of the described second source input detecting circuit of control of the 3rd mains input detection circuit, therefore, even if now there is second source V2 to input simultaneously, second source input detecting circuit also cannot detect that second source inputs, corresponding second source voltage output switch circuit can not be opened (also namely closing), and second source voltage exports, and second source V2 does not power; The control end of the first supply voltage output switch circuit is connected with described 3rd power supply simultaneously, and therefore when the 3rd power supply has voltage to input, the first supply voltage output switch circuit is closed, now the first power supply V1 does not power, to sum up, when the 3rd power supply V3 has input, powered by the 3rd power supply V3.
The multi input power supply switch circuit of the present embodiment, described second source input detecting circuit, the 3rd mains input detection circuit, the first supply voltage output switch circuit and second source voltage output switch circuit all adopt discrete electronic device to build, by the highest for the priority of the 3rd power supply, the priority of the first power supply is minimum, when inserting second source or the 3rd power supply, the high Power supply of priority can be automatically switched to according to priority, without the need to connecting external control device, reduce circuit cost; The automatic seamless that can meet the input of many power supplys switches, and correctly can select according to priority level the running status not relying on control device, if the 3rd power supply, second source, the first power supply are respectively adapter input power, USB input power and carry the words of battery supply, then the priority of adaptor power supplies is the highest, the priority carrying battery supply is minimum, saving battery electric quantity can also be reached, the object of lengthening working hours.
As a preferred embodiment, as shown in Figure 2, show the circuit theory diagrams of a kind of preferred embodiment of multi input power supply switch circuit, in the present embodiment, described first supply voltage output switch circuit comprises the first PMOS Q1, the drain electrode 3 of described first PMOS Q1 is connected with the first power supply VBAT, and the source electrode 2 of described first PMOS Q1 is connected with voltage output end Vout, is connected after the grid 1 of described first PMOS Q1 connects the 5th resistance R5 with ground end.The operation principle of this first supply voltage output switch circuit is: when only there being the first power supply VBAT to input, because R5 ground connection, first PMOS Q1 conducting under the voltage of the first power supply VBAT, the first power supply VBAT voltage exports through the first PMOS Q1, and system uses the first power supply VBAT to power.
In the present embodiment, the first diode D1 is also parallel with between the drain electrode 3 of the first described PMOS Q1 and source electrode 2, prevent when by second source or the 3rd Power supply, voltage pours in down a chimney to battery, ensure power supply safety, and the first diode D1 can also play afterflow effect when electrical source exchange.
In the present embodiment, described second source voltage output switch circuit comprises the second PMOS Q2, the source electrode 2 of described second PMOS Q2 is connected with second source Vbus, the drain electrode 3 of described second PMOS Q2 is connected with described voltage output end Vout, and the grid 1 of described second PMOS is connected with the output of second source input detecting circuit.When second source Vbus has voltage to input, second source input detecting circuit detects voltage input signal, and sends low level to the grid 1 of the second PMOS, thus makes the second PMOS Q2 conducting, and second source Vbus voltage exports.
Preferably, the 3rd resistance R3 is also connected with between the source electrode 2 of described second PMOS Q2 and grid 1, for when the first NMOS tube Q3 ends, the grid 1 of the second PMOS Q2 is pulled to high level by second source Vbus, therefore the second PMOS Q2 cut-off, and then close second source Vbus and to power output.
In the present embodiment, described second source input detecting circuit comprises the first bleeder circuit and the first NMOS tube Q3, the input of described first bleeder circuit is connected with second source Vbus, the output of described first bleeder circuit is connected with the grid 1 of described first NMOS tube Q3, the source electrode 2 of described first NMOS tube Q3 is connected with the grid 1 of described second PMOS Q2, be connected with ground end after the drain electrode 3 of described first NMOS tube Q3 connects the 4th resistance R4, the grid 1 of described first PMOS Q1 is connected with second source Vbus.When second source Vbus has voltage to input, second source Vbus voltage one tunnel is connected with the grid 1 of the first PMOS Q1, grid 1 to the first PMOS Q1 exports high level, Q1 is turned off, another road enters second source input detecting circuit, through the first resistance R1 and the second resistance R2 dividing potential drop, to grid 1 one high level inputs of the first NMOS tube Q3, due to drain electrode 3 ground connection of the first NMOS tube Q3, for low level, therefore the first NMOS tube Q3 conducting, its source electrode 1 current potential drags down, thus make the second PMOS Q2 conducting, therefore second source Vbus voltage exports.
Wherein, described 3rd mains input detection circuit comprises the second bleeder circuit, the input of described second bleeder circuit is connected with the 3rd power supply VAC, and the output of described second bleeder circuit is connected with the drain electrode 3 of described first NMOS tube Q3, and the 3rd power supply VAC is connected with described voltage output end Vout.In the present embodiment, when the 3rd power supply VAC has voltage to input, 3rd power supply VAC voltage is after described second bleeder circuit dividing potential drop, input to the drain electrode 3 of the first NMOS tube Q3, the level of the drain electrode 3 of the first NMOS tube Q3 is drawn high, by arranging the dividing potential drop of dividing potential drop higher than described first bleeder circuit of the second bleeder circuit, meet when having second source Vbus and the 3rd power supply VAC voltage to input simultaneously, drain electrode 3 voltage of the first NMOS tube Q3 is higher than grid 1 voltage, first NMOS tube Q3 is turned off, now the source electrode 1 of the first NMOS tube Q3 is high level, grid 1 level of the second PMOS Q2 is drawn high, therefore the second PMOS Q2 cut-off, second source Vbus cannot output voltage, also be, when having second source Vbus and the 3rd power supply VAC voltage to input simultaneously, second source input detecting circuit cannot detect second source Vbus, corresponding second source voltage output switch circuit turns off, second source Vbus cannot output voltage.When the 3rd power supply VAC voltage input, second source Vbus do not have voltage to input, the grid 1 of the first NMOS tube Q3 is low level, first NMOS tube Q3 remains shutoff, voltage is provided to export by the 3rd power supply VAC, the voltage-controlled metal-oxide-semiconductor adopted in the present embodiment, control precision is higher, and, when different power supplys inputs, can realize switching according to priority automatic seamless.
In the present embodiment, in order to simplify circuit structure, described first bleeder circuit comprises the first resistance R1 and the second resistance R2 that are in series, described first resistance R1 is connected with second source Vbus, described second resistance R2 connects earth terminal, the grid 1 of described first NMOS tube Q3 is connected between described first resistance R1 and the second resistance R2, described second bleeder circuit comprises the 6th resistance R6 and the 7th resistance R7 that are in series, and to drain the 4th resistance R4 be connected with a NMON pipe Q3, described 6th resistance R6 is connected with the 3rd power supply VAC, described 7th resistance R7 connects earth terminal, tell the 4th resistance R4 and be connected with the drain electrode of the first NMOS tube Q3, the drain electrode 3 of described first NMOS tube Q3 is connected between described 6th resistance R6 and the 7th resistance R7, the ratio of the resistance of described 7th resistance R7 the 4th resistance R4 and the 6th resistance R6 in parallel is greater than the ratio of the resistance of described second resistance R2 and the first resistance R1, the grid 1 of described first PMOS Q1 is connected with the 3rd power supply VAC simultaneously.The ratio of the resistance being greater than described second resistance R2 and the first resistance R1 is arranged to by the ratio of the resistance by the 4th resistance R4 and the 6th resistance R6 in parallel for described 7th resistance R7, the 7th resistance R7 and the dividing potential drop in parallel of the 4th resistance R4 is made to be greater than the dividing potential drop of described second resistance R2, guarantee is when having second source Vbus and the 3rd power supply VAC voltage to input simultaneously, drain electrode 3 voltage of the first NMOS tube Q3 is higher than grid 1 voltage, first NMOS tube Q3 can be turned off, and then ensure that the priority of priority ratio second voltage of the 3rd power supply is high.
Described multi input power supply switch circuit also comprises double diode D3, described second source Vbus is connected with the grid 1 of described first PMOS Q1 by described double diode D3 with the 3rd power supply VAC, two inputs of described double diode D3 are connected with described second source Vbus and the 3rd power supply VAC respectively, the output of described double diode D3 is connected with the grid 1 of described first PMOS Q1, by arranging double diode D3, second source Vbus and the 3rd power supply VAC can be isolated, realizing two voltages does not affect mutually.
Further, when the first power supply Vbat have voltage input, second source Vbus and the 3rd power supply VAC do not have voltage to input time, pour in down a chimney in second source Vbus and the 3rd power supply VAC to prevent the voltage of the first power supply Vbat, be connected with the second diode D2 between the drain electrode 3 of the second PMOS Q2 and voltage output end Vout, between described 3rd power supply VAC and voltage output end Vout, be connected with the 4th diode D4.
It should be noted that; each technical scheme of the present embodiment is only a kind of preferred embodiment giving multi input power supply switch circuit; but be not limited to above-mentioned citing; such as; the voltage-controlled metal-oxide-semiconductor that discrete circuit second source input detecting circuit in the present embodiment, the first supply voltage output switch circuit and second source voltage output switch circuit all adopt; in the essential scope not departing from the present embodiment, metal-oxide-semiconductor can certainly be replaced with and adopt the triode of Current Control to realize, still belong to protection scope of the present invention.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (10)
1. a multi input power supply switch circuit, it is characterized in that: comprise the second source input detecting circuit for detecting second source input, for detecting the 3rd mains input detection circuit of the input of the 3rd power supply, first supply voltage output switch circuit, and second source voltage output switch circuit, the input of described second source input detecting circuit and the 3rd mains input detection circuit connects one to one with second source and the 3rd power supply respectively, the output of described second source input detecting circuit is connected with the control end of described second source voltage output switch circuit, open or close the output of second source voltage for controlling second source voltage output switch circuit, the output of described 3rd mains input detection circuit is connected with the control end of described second source input detecting circuit, for controlling the conducting state of described second source input detecting circuit, the control end of described first supply voltage output switch circuit is connected with described second source and the 3rd power supply respectively, open or close the first supply voltage output for controlling the first supply voltage output switch circuit.
2. multi input power supply switch circuit according to claim 1, it is characterized in that: described first supply voltage output switch circuit comprises the first PMOS, the drain electrode of described first PMOS is connected with the first power supply, the source electrode of described first PMOS is connected with voltage output end, is connected after grid connection the 5th resistance of described first PMOS with ground end.
3. multi input power supply switch circuit according to claim 2, is characterized in that: be also parallel with the first diode between the drain electrode of the first described PMOS and source electrode.
4. multi input power supply switch circuit according to claim 2, it is characterized in that: described second source voltage output switch circuit comprises the second PMOS, the source electrode of described second PMOS is connected with second source, the drain electrode of described second PMOS is connected with described voltage output end, and the grid of described second PMOS is connected with the output of second source input detecting circuit.
5. multi input power supply switch circuit according to claim 4, is characterized in that: be also connected with the 3rd resistance between the source electrode of described second PMOS and grid.
6. the multi input power supply switch circuit according to claim 4 or 5, it is characterized in that: described second source input detecting circuit comprises the first bleeder circuit and the first NMOS tube, the input of described first bleeder circuit is connected with second source, the output of described first bleeder circuit is connected with the grid of described first NMOS tube, the source electrode of described first NMOS tube is connected with the grid of described second PMOS, be connected with ground end after drain electrode connection the 4th resistance of described first NMOS tube, the grid of described first PMOS is connected with second source.
7. multi input power supply switch circuit according to claim 6, it is characterized in that: described 3rd mains input detection circuit comprises the second bleeder circuit, the input of described second bleeder circuit is connected with the 3rd power supply, the output of described second bleeder circuit is connected with the drain electrode of described first NMOS tube, and the 3rd power supply is connected with described voltage output end.
8. multi input power supply switch circuit according to claim 7, it is characterized in that: described first bleeder circuit comprises the first resistance and the second resistance that are in series, described first resistance is connected with second source, described second resistance connects earth terminal, the grid of described first NMOS tube is connected between described first resistance and the second resistance, described second bleeder circuit comprises the 6th resistance and the 7th resistance that are in series, and the 4th resistance to be connected with the drain electrode of the first NMOS tube, described 6th resistance is connected with the 3rd power supply, described 7th resistance connects earth terminal, described 4th resistance is connected with the drain electrode of the first NMOS tube, the drain electrode of described first NMOS tube is connected between described 6th resistance and the 7th resistance, the ratio of the resistance of described 7th resistor coupled in parallel the 4th resistance and the 6th resistance is greater than the ratio of the resistance of described second resistance and the first resistance, the grid of described first PMOS is connected with the 3rd power supply simultaneously.
9. multi input power supply switch circuit according to claim 7, it is characterized in that: described multi input power supply switch circuit also comprises double diode, described second source is connected by the grid of described double diode with described first PMOS with the 3rd power supply, two inputs of described double diode are connected with described second source and the 3rd power supply respectively, and the output of described double diode is connected with the grid of described first PMOS.
10. multi input power supply switch circuit according to claim 9, is characterized in that: be connected with the second diode between the drain electrode of the second PMOS and voltage output end, the described 3rd is connected with the 4th diode between power supply and voltage output end.
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| CN201410700845.1A CN104377812B (en) | 2014-11-28 | 2014-11-28 | A kind of multi input power supply switch circuit |
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| CN201410700845.1A CN104377812B (en) | 2014-11-28 | 2014-11-28 | A kind of multi input power supply switch circuit |
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| CN106340948B (en) * | 2015-12-01 | 2018-11-20 | 深圳开阳电子股份有限公司 | A kind of three power supply automatic switchover circuits |
| WO2020034447A1 (en) * | 2018-08-14 | 2020-02-20 | 广州奥格智能科技有限公司 | Ultra-low loss dual power switching circuit having anti-backflow function |
| CN109217459A (en) * | 2018-09-19 | 2019-01-15 | 广州市中海达测绘仪器有限公司 | A kind of switching circuit of multiple power supplies input |
| CN109638956A (en) * | 2018-12-28 | 2019-04-16 | 南京奥视威电子科技股份有限公司 | Power supply switch circuit |
| CN109638956B (en) * | 2018-12-28 | 2024-02-23 | 南京奥视威电子科技股份有限公司 | Power supply switching circuit |
| CN111030258A (en) * | 2019-12-30 | 2020-04-17 | Tcl通力电子（惠州）有限公司 | Three-way power supply switching circuit, device and electronic equipment |
| CN111030258B (en) * | 2019-12-30 | 2023-10-20 | 通力科技股份有限公司 | Three-way power supply switching circuit, three-way power supply switching device and electronic equipment |
| CN112542829A (en) * | 2020-11-16 | 2021-03-23 | 科大讯飞股份有限公司 | Multi-path power supply management method and multi-path power supply device applied to electronic equipment |
| CN114069591A (en) * | 2021-10-11 | 2022-02-18 | 许继电源有限公司 | Multi-port input auxiliary power supply device, system and control method thereof |
| CN114050639A (en) * | 2021-10-26 | 2022-02-15 | 许继电源有限公司 | Main/standby power supply switching device and control method thereof |
| CN114336938A (en) * | 2021-12-30 | 2022-04-12 | 北京深思数盾科技股份有限公司 | Battery power supply system and electronic equipment |
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