CN216904676U - Power supply switching circuit and electronic equipment - Google Patents
Power supply switching circuit and electronic equipment Download PDFInfo
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- CN216904676U CN216904676U CN202220266452.4U CN202220266452U CN216904676U CN 216904676 U CN216904676 U CN 216904676U CN 202220266452 U CN202220266452 U CN 202220266452U CN 216904676 U CN216904676 U CN 216904676U
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Abstract
The embodiment of the utility model discloses a power supply switching circuit and electronic equipment, wherein the circuit comprises: the comparison control unit and the plurality of power supply switching units are connected; each power supply switching unit comprises a switch unit and a power supply interface; each power interface is used for accessing a group of power supplies; each power supply interface is connected with the first end of the corresponding switch unit, and the second ends of all the switch units are connected to be used as power supply output ends; each power supply interface is connected with different input ends of the comparison control unit; the output end of the comparison control unit is connected with the control end of the switch unit; the comparison control unit is used for comparing the sizes of the connected power supplies and controlling the on-off state of each switch unit so as to enable one group of power supplies to be output to the power supply output end. The controller is not used, the battery switching management is realized only by using the comparison control unit, the used devices in the whole scheme are fewer, and the circuit cost is reduced.
Description
Technical Field
The utility model relates to the field of battery switching, in particular to a power switching circuit and electronic equipment.
Background
Battery powered devices are currently in widespread use. At present, besides a mobile phone, part of CPE equipment and portable base station equipment also need to be powered by batteries. When the battery is low in power, another battery needs to be accessed, but the system is required to work normally without shutdown. The conventional scheme usually uses a diode as a switching management mode, but the diode drops, so that the battery efficiency is low. Or a controller is used for switch switching control, but the controller and control logic are additionally added, so that the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a power switching circuit, including: the comparison control unit and the plurality of power supply switching units are arranged; each power supply switching unit comprises a switch unit and a power supply interface; each power interface is used for accessing a group of power supplies;
each power supply interface is connected with the first end of the corresponding switch unit, and the second ends of all the switch units are connected to be used as power supply output ends; each power supply interface is connected with different input ends of the comparison control unit; the output end of the comparison control unit is connected with the control end of the switch unit;
the comparison control unit is used for comparing the sizes of the connected power supplies and controlling the on-off state of each switch unit so as to enable one group of power supplies to be output to the power supply output end.
Further, the switch unit comprises a diode and a PMOS tube, wherein the cathode of the diode is connected with the drain of the PMOS tube, and the anode of the diode is connected with the source of the PMOS tube;
the first end of the switch unit is the drain electrode of the PMOS tube, the control end of the switch unit is the grid electrode of the PMOS tube, and the second end of the switch unit is the source electrode of the PMOS tube.
Further, the number of the power switching units is two.
Further, the comparison control unit includes a first comparator and a second comparator;
the reverse input end of the first comparator is connected with the first power interface, the normal input end of the first comparator is connected with the second power interface, and the output end of the first comparator is connected with the control end of the first power switch unit;
the positive input end of the second comparator is connected with the first power interface, the inverting input end of the second comparator is connected with the second power interface, and the output end of the second comparator is connected with the control end of the second power switch unit.
Further, the power interface is used for connecting a battery.
Furthermore, the control end of each switch unit is grounded through a pull-down resistor.
Furthermore, the input end of the comparison control unit is grounded through a pull-down resistor.
Further, the present application also provides an electronic device including the power switching circuit according to any one of the above embodiments.
Further, the method also comprises the following steps: and each group of batteries is detachably connected with the corresponding power interface.
Further, the electronic device is a portable base station device, a workbench or a notebook computer.
The embodiment of the utility model discloses a power supply switching circuit and electronic equipment, wherein the circuit comprises: the comparison control unit and the plurality of power supply switching units are arranged; each power supply switching unit comprises a switch unit and a power supply interface; the power supply interface is connected with the first end of the switch unit, and the power supply interface is connected with the input end of the comparison control unit; the output interface of the comparison control unit is connected with the control end of the switch unit and used for controlling the switch state of the switch unit, the second end of the switch unit is connected with the output end and used for outputting current, and the power supply switching units are connected in parallel. The controller is not used, the battery switching management is realized only by using the comparison control unit, the used devices in the whole scheme are fewer, and the circuit cost is reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
FIG. 1 is a schematic diagram of a power switching circuit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a power switching circuit according to an embodiment of the utility model;
fig. 3 shows a schematic diagram of a power switching circuit according to another embodiment of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
The technical solution of the present application is explained with specific examples.
The power supply switching circuit of the embodiment comprises a comparison control unit and a plurality of power supply switching units; each power supply switching unit comprises a switch unit and a power supply interface; each power interface is used for accessing a group of power supplies; each power supply interface is connected with the first end of the corresponding switch unit, and the second ends of all the switch units are connected to be used as power supply output ends; each power supply interface is connected with different input ends of the comparison control unit; the output end of the comparison control unit is connected with the control end of the switch unit; the comparison control unit is used for comparing the sizes of the connected power supplies and controlling the on-off state of each switch unit so as to enable one group of power supplies to be output to the power supply output end.
Each power supply switching unit consists of a power supply interface and a switch unit, the power supply interface is used for being connected with a battery and supplying power to the circuit, and the comparison control unit controls the current flowing condition of the corresponding power supply switching unit through the switch unit.
As shown in fig. 1, the schematic diagram includes two power switching units (the portion framed by the dashed line is the power switching unit), wherein the first power interface 10 is connected to the first end of the first switch unit 20, the second end of the first switch unit is connected to the power output end 60, the second power interface 40 is connected to the first end of the second switch unit 50, the second end of the second switch unit 50 is connected to the power output end 60, and the power output end 60 is connected to the power utilization circuit 70, so that the power source from which the power source for finally supplying power to the power utilization circuit 70 is received can be controlled by the switching states of the first switch unit 20 and the second switch unit 50. Both power interfaces may be used to connect with a battery, and may be a battery socket or other power interface supporting battery connection and disconnection, which is not limited herein.
In this embodiment, the comparison control unit 30 controls the two switch units, as shown in fig. 1, the first power interface 10 and the second power interface 40 are respectively connected to the input end of the comparison control unit 30, the control ends of the first switch unit 20 and the second switch unit 50 are respectively connected to the output end of the comparison control unit 30, and the comparison control unit 30 compares the voltages of the two power interfaces to control the switch of the corresponding switch unit. When the voltage of the first power interface 10 is greater than the voltage of the second power interface 40, the first switching unit 20 is turned on and the second switching unit 50 is turned off, and power is supplied using the power of the first power interface 10. If the voltage of the first power interface 10 is less than the voltage of the second power interface 40, the first switch unit 20 is turned off, and the second switch unit 50 is turned on to supply power using the power from the second power interface 40, thereby implementing power switching.
Specifically, the circuit diagram shown in fig. 2 may be further referred to.
Corresponding to the structure in fig. 1, the two switch units of this embodiment may include a diode and a PMOS transistor as shown in Q1 and Q2 of fig. 2, a cathode of the diode is connected to a drain of the PMOS transistor, and an anode of the diode is connected to a source of the PMOS transistor in parallel, where the drain of the PMOS transistor is a first end of the two switch units, a gate is a control end, and the source is a second end, where the diode may be a body diode integrally formed with the PMOS transistor, or an externally connected diode.
vcc _ BAT1 is first power interface 10, vcc _ BAT2 is second power interface 40, vcc _ BAT is power utilization circuit 70, U1 corresponds to comparison control unit 30, and is a two-way comparator for comparing the voltages of vcc _ BAT1 and vcc _ BAT 2.
The vcc _ bat1 is connected to pin 2 and pin 5 (i.e., input terminals) of the dual-path comparator U1, where the input terminals include positive and negative terminals, that is, a positive input terminal and a negative input terminal, in this embodiment, pin 2 is a negative terminal, pin 5 is a positive terminal, and the rest of the pins are the same. vcc _ bat2 is connected to pin 3 and pin 6 of two-way comparator U1, when the voltage of vcc _ bat1 is greater than the voltage of vcc _ bat2, the dual-way comparator compares the voltages of pin No. 2 and pin No. 3, respectively, and compares the voltages of pin No. 5 and pin No. 6, to obtain the results of pin No. 2 greater than 3 and pin No. 5 greater than 6, therefore, the output terminal OUTA outputs a low voltage, the OUTB outputs a high voltage, and the output terminal OUTA is connected to the control terminal of the first switching unit Q1, according to the operation principle of PMOS transistor, Q1 is in the pass state, and OUTB is connected to the control terminal of Q2, therefore, the Q2 is in an open circuit state, thereby realizing that the higher voltage side is used as the power supply, and the battery connected with vcc _ bat2 is unplugged at this time, there is no influence on the operation of the whole device, so that the user can replace the battery at vcc _ bat2 with a new battery.
In actual use, as the service time increases, the voltage of the battery connected with the vcc _ bat1 becomes lower, and the vcc _ bat2 is replaced by a new battery, so that the voltage of the vcc _ bat2 is greater than that of the vcc _ bat1, and similar to the above process, the OUTA of the two-way comparator U1 outputs a high voltage, and the OUTB outputs a low voltage, so that the Q2 is in a pass state, and the Q1 is in a cut-off state, thereby realizing the switching of the battery.
When the voltages of vcc _ bat1 and vcc _ bat2 are equal, the state output by dual-path comparator U1 is uncertain, and therefore, there are three states of (1) either Q1 or Q2 is conductive, (2) both Q1 and Q2 are conductive, and (3) neither Q1 nor Q2 is conductive.
In the first state, the conducting battery supplies power, in the second state, the two batteries supply power together, and in the third state, although the PMOS tube is not conducted, the diode connected in parallel with the PMOS tube is used as a freewheeling diode, so that the two batteries can continue to supply power for the circuit, and the normal use of the whole circuit is ensured.
Furthermore, the control terminals of the Q1 and the Q2 are grounded through pull-down resistors, and the four input terminals of the two-way comparator U1 are grounded through a pull-down resistor, so as to protect the circuit safety.
In actual use, if a battery is only accessed to the vcc _ bat1, the battery is powered by the vcc _ bat1, when the battery accessed to the vcc _ bat1 is low in electricity quantity and the voltage is reduced in use, another fully charged battery is accessed to the vcc _ bat2, according to the circuit logic, the fully charged battery on the vcc _ bat2 can be used for operation without shutting down the equipment, and a user can directly unplug the battery on the vcc _ bat1, so that the battery is switched in an noninductive way, and the switching does not influence the continuous use of the equipment by the user.
This embodiment has realized the contrast to two battery voltage through a double-circuit comparator, and then has controlled the break-make state of two switches, and then has realized the switching of battery to carry out the switching operation of circuit through the pmos pipe, reduced voltage loss, whole circuit is simple, does not have the intervention of controller, has reduced the cost.
As shown in fig. 3, a further power switching circuit in this embodiment is different from embodiment 1, in this embodiment, two single comparators are used as comparison control units, the single comparator U2 is used to control the switch of Q1, the U3 is used to control the switch of Q2, and its specific operation principle is similar to that in embodiment 1, when the voltage of vcc _ bat1 is greater than that of vcc _ bat2, U2 outputs a low voltage, U3 outputs a high voltage, so that Q1 turns on Q2 and does not turn on, when the voltage of vcc _ bat1 is less than that of vcc _ bat2, U2 outputs a high voltage, U3 outputs a low voltage, so that Q1 does not turn on Q2 and turns on, because two single comparators are used, the whole circuit cable is simpler.
The application further provides an electronic device, which comprises the power supply switching circuit in any one of the embodiments. Further comprising: and each group of batteries is detachably connected with the corresponding power interface. Further, the electronic device is a portable base station device, a workbench or a notebook computer.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and it should also be noted that, for example, the functions noted in the block may occur out of the order noted in the figures in alternative implementations. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. A power switching circuit, comprising: the comparison control unit and the plurality of power supply switching units are arranged; each power supply switching unit comprises a switch unit and a power supply interface; each power interface is used for accessing a group of power supplies;
each power supply interface is connected with the first end of the corresponding switch unit, and the second ends of all the switch units are connected to be used as power supply output ends; each power supply interface is connected with different input ends of the comparison control unit; the output end of the comparison control unit is connected with the control end of the switch unit;
the comparison control unit is used for comparing the sizes of the accessed power supplies and controlling the on-off state of each switch unit so as to enable one group of power supplies to be output to the power supply output end.
2. The power switching circuit according to claim 1, wherein the switching unit comprises a diode and a PMOS transistor, a cathode of the diode is connected with a drain of the PMOS transistor, and an anode of the diode is connected with a source of the PMOS transistor;
the first end of the switch unit is a drain electrode of the PMOS tube, the control end of the switch unit is a grid electrode of the PMOS tube, and the second end of the switch unit is a source electrode of the PMOS tube.
3. The power switching circuit according to claim 1, wherein the number of the power switching units is two.
4. The power supply switching circuit according to claim 3, wherein the comparison control unit includes a first comparator and a second comparator;
the reverse input end of the first comparator is connected with the first power interface, the positive input end of the first comparator is connected with the second power interface, and the output end of the first comparator is connected with the control end of the first power switch unit;
the positive input end of the second comparator is connected with the first power interface, the inverting input end of the second comparator is connected with the second power interface, and the output end of the second comparator is connected with the control end of the second power switch unit.
5. The power switching circuit of claim 1, wherein the power interface is configured to access a battery.
6. The power switching circuit of claim 1, wherein the control terminal of each of the switching units is further grounded through a pull-down resistor.
7. The power switching circuit of claim 1, wherein the input terminal of the comparison control unit is further connected to ground through a pull-down resistor.
8. An electronic device comprising the power supply switching circuit according to any one of claims 1 to 7.
9. The electronic device of claim 8, further comprising: and each group of batteries is detachably connected with the corresponding power interface.
10. The electronic device of claim 8, wherein the electronic device is a portable base station device, a workbench, or a notebook computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220266452.4U CN216904676U (en) | 2022-02-09 | 2022-02-09 | Power supply switching circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220266452.4U CN216904676U (en) | 2022-02-09 | 2022-02-09 | Power supply switching circuit and electronic equipment |
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| CN216904676U true CN216904676U (en) | 2022-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116954297A (en) * | 2023-09-19 | 2023-10-27 | 深圳市思远半导体有限公司 | Power supply selection circuit and power supply |
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- 2022-02-09 CN CN202220266452.4U patent/CN216904676U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116954297A (en) * | 2023-09-19 | 2023-10-27 | 深圳市思远半导体有限公司 | Power supply selection circuit and power supply |
| CN116954297B (en) * | 2023-09-19 | 2023-12-15 | 深圳市思远半导体有限公司 | Power supply selection circuit and power supply |
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