CN109256752B - Battery protection circuit and power supply system - Google Patents
Battery protection circuit and power supply system Download PDFInfo
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- CN109256752B CN109256752B CN201811385950.5A CN201811385950A CN109256752B CN 109256752 B CN109256752 B CN 109256752B CN 201811385950 A CN201811385950 A CN 201811385950A CN 109256752 B CN109256752 B CN 109256752B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
Abstract
The invention discloses a battery protection circuit and a power supply system, wherein the battery protection circuit comprises: the power supply circuit comprises a power supply battery, an external power supply interface, a first PMOS (P-channel metal oxide semiconductor) tube, a first resistor and an external power supply switch circuit; the positive pole of the power supply is connected with the drain electrode of the first PMOS tube, and the negative pole of the power supply is grounded and connected with one end of the first resistor; the other ends of the external power supply interface and the first resistor are connected to the grid electrode of the first PMOS tube, and the source electrode of the first PMOS tube is used for connecting target equipment to provide a system power supply; the input end of the external power supply switch circuit is connected with an external power supply interface, the output end of the external power supply switch circuit is connected with the source electrode of the first PMOS tube, and the external power supply interface is used for being connected into an external power supply when the power supply battery does not work. By the technical scheme of the invention, the external power supply can be accessed to safely supply power through the reserved interface when the system power supply battery of the equipment is completely consumed, the safety of the equipment power supply system can be improved, the reverse connection protection of the power supply battery is also increased, and the like.
Description
Technical Field
The invention relates to the technical field of power supply design, in particular to a battery protection circuit and a power supply system.
Background
In recent years, most of products of intelligent hardware single products such as intelligent door locks adopt low-power-consumption designs, so that power is supplied based on removable AA batteries (namely dry batteries). However, when such a battery is used for power supply, there is a case where the device cannot be used in a normal manner when the device is in an off state, the battery is drained, and the user cannot replace the battery from the outside. At this time, the existing solution is to supply power externally through a USB power supply interface reserved externally, so that the device can be used normally again.
Use intelligent lock as an example, after intelligent lock equipment's dry battery used up, then the user can't use password, fingerprint, bluetooth, wifi, APP mode to unblank outdoors, because the lock battery is installed in indoor lock device, also can't change the battery externally, must supply power for intelligent lock equipment through the USB 5V power supply port that the outside was reserved this moment to open the lock, then through opening the battery that indoor lock battery device changed new.
However, for such devices that have both a power supply battery and can be supplied with power through an externally reserved USB, especially when an external power supply is connected through a power supply interface, the mutual influence and safety of the two power supplies need to be considered.
Disclosure of Invention
In view of the above problems, the present invention provides a battery protection circuit and a power supply system, which can solve the problems of the existing power supply schemes by improving the existing two power supply circuits.
An embodiment of the present invention provides a battery protection circuit, including: the power supply circuit comprises a power supply battery, an external power supply interface, a first PMOS (P-channel metal oxide semiconductor) tube, a first resistor and an external power supply switch circuit;
the anode of the power supply battery is connected with the drain electrode of the first PMOS tube, and the cathode of the power supply battery is grounded and connected with one end of the first resistor;
the other end of the external power supply interface and the other end of the first resistor are both connected to the grid electrode of the first PMOS tube, and the source electrode of the first PMOS tube is used for being connected with target equipment to provide a system power supply for the target equipment;
the input end of the external power supply switch circuit is connected with the external power supply interface, the output end of the external power supply switch circuit is connected with the source electrode of the first PMOS tube, and the external power supply interface is used for connecting an external power supply when the power supply battery does not work.
Further, the battery protection circuit according to the embodiment of the present invention further includes: and the output end of the external power supply switch circuit is connected to the source electrode of the first PMOS tube through the first diode.
Furthermore, the external power switch circuit comprises a second PMOS tube, a second resistor, a third resistor and a first capacitor,
the external power supply interface is connected with one end of the second resistor, one end of the first capacitor and the source electrode of the second PMOS tube, the other end of the second resistor is grounded and connected with one end of the third resistor, the other end of the third resistor is connected with the other end of the first capacitor and the grid electrode of the second PMOS tube, and the drain electrode of the second PMOS tube is connected with the source electrode of the first PMOS tube.
Further, the battery protection circuit according to the embodiment of the present invention further includes: and the anode of the second diode is connected with the other end of the second resistor, and the cathode of the second diode is connected with the other end of the third resistor.
Further, the battery protection circuit according to the embodiment of the present invention further includes: and the source electrode of the first PMOS tube is connected to the target equipment through the voltage matching circuit.
Further, the voltage matching circuit is a DC-DC circuit or a linear adjusting circuit.
Furthermore, the external power interface is a USB interface, a Type-C interface or a Lightning interface.
Based on the above battery protection circuit, an embodiment of the present invention further provides a power supply system, including: the battery protection circuit comprises a power supply battery, an external power supply interface, a first PMOS (P-channel metal oxide semiconductor) tube, a first resistor and an external power supply switch circuit;
the anode of the power supply battery is connected with the drain electrode of the first PMOS tube, and the cathode of the power supply battery is grounded and connected with one end of the first resistor;
the other end of the external power supply interface and the other end of the first resistor are both connected to the grid electrode of the first PMOS tube, and the source electrode of the first PMOS tube is connected with the target equipment to provide a system power supply;
the input end of the external power supply switch circuit is connected with the external power supply interface, the output end of the external power supply switch circuit is connected with the source electrode of the first PMOS tube, and the external power supply interface is used for connecting an external power supply when the power supply battery does not work.
Further, the power supply system according to the embodiment of the present invention further includes: and the output end of the external power supply switch circuit is connected to the source electrode of the first PMOS tube through the first diode.
Further, the power supply system according to the embodiment of the present invention further includes: and the source electrode of the first PMOS tube is connected to the target equipment through the voltage matching circuit.
By the technical scheme of the invention, the external power supply can be accessed to safely supply power through the reserved interface when the system power supply battery of the target equipment is completely consumed, the safety of the equipment power supply system can be improved, the reverse connection protection of the power supply battery is also increased, and the like.
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.
FIG. 1 is a prior art power supply circuit;
FIG. 2 is another prior art power supply circuit;
fig. 3 is a schematic diagram of a first structure of a battery protection circuit according to an embodiment of the invention;
fig. 4 is a second structural diagram of the battery protection circuit according to the embodiment of the invention;
fig. 5 is a first structural schematic diagram of a power supply system according to an embodiment of the invention;
fig. 6 is a second structural diagram of the power supply system according to the embodiment of the invention.
Description of the main element symbols:
100-a power supply system; 1-a battery protection circuit; 2-a target device; 10-a power supply battery; 20-external power interface; 30-external power supply switch circuit; 40-a voltage matching circuit; q1-first PMOS tube; q2-second PMOS tube; r1 — first resistance; r2 — second resistance; r3 — third resistance; d1 — first diode; d2 — second diode; c1 — first capacitance.
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 invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For the existing power supply system which includes both the power supply battery part and the power supply circuit of the reserved external interface, the prior art mainly adopts two solutions in consideration of the mutual influence between the two power supply circuits, as shown in fig. 1 and fig. 2 respectively. As shown in fig. 1, for the first scheme, the power supply battery is used as a system power supply, and the external power supply circuit is connected to the external power supply through a reserved interface. In order to ensure the safety of the system power supply as the power of the power supply battery is consumed, a diode is connected in series on the branch of the power supply battery. Therefore, when the power supply battery cannot work, an external power supply needs to be connected, and the diode can reversely cut off the path from the external power supply to the power supply battery, so that the safety and the normal work of the whole power supply system are ensured.
As shown in fig. 2, according to the second scheme, the power supply battery and the external power supply circuit respectively pass through respective voltage matching circuits to form two paths, and then are connected to the target device in parallel to solve mutual interference between the two circuits. Therefore, when the power supply battery is in a low battery state and cannot work normally, power can be supplied through a path of the external power supply circuit, and therefore normal operation of the whole system is guaranteed.
It can be seen that in the two existing solutions, the diode used in the first solution will generate a certain power loss, which will be very obvious for the electronic device sensitive to power consumption, and the useless power consumed by the diode will be very obvious under the normal operation of the power supply battery. And a voltage matching circuit is separately added in the second scheme, so that not only is the cost increased, but also the complexity, the occupied area and the like of the PCB are obviously increased.
Based on the problems of the two schemes, the invention provides the battery protection circuit, mutual influence of the two power supply circuits is realized by using some basic components, on the premise of ensuring normal work of the whole power supply system, the generation of useless power consumption of the first scheme can be solved, and the problems of increased cost and design complexity of the second scheme and the like are solved.
The present invention will be described in detail with reference to specific examples.
Example 1
Referring to fig. 3, the present embodiment provides a battery protection circuit 1, which can be used in some electronic devices such as an intelligent door lock, and the battery protection circuit is mainly powered by a power supply battery and needs to reserve an external interface for external power supply in an emergency. The battery protection circuit 1 comprises a power supply battery 10, an external power interface 20, a first PMOS transistor Q1, a first resistor R1 and an external power switch circuit 30.
Specifically, as shown in fig. 3, the positive electrode of the power supply battery 10 is connected to the drain of the first PMOS transistor Q1, and the negative electrode thereof is grounded and connected to one end of the first resistor R1. The other ends of the external power interface 20 and the first resistor R1 are both connected to the gate of the first PMOS transistor Q1, and the source of the first PMOS transistor Q1 is used for connecting a target device 2 to provide a system power supply for the target device 2.
The input end of the external power supply switch circuit 30 is connected to the external power supply interface 20, the output end of the external power supply switch circuit is connected to the source electrode of the first PMOS transistor Q1, and the external power supply interface 20 is used for accessing an external power supply when the power supply battery 10 does not work.
In this embodiment, the first PMOS transistor Q1 can be used for reverse connection protection when the battery is reverse connected. Exemplarily, the external power interface will not be connected to the external power source when the power supply battery 10 is operating normally. At this time, the first PMOS transistor Q1 is turned on, and the power supply battery 10 is output from the source of the first PMOS transistor Q1 to the target device 2. If the power supply battery 10 is connected reversely, the first PMOS transistor Q1 will be turned off because the gate voltage of the first PMOS transistor Q1 is higher than the source voltage thereof. Therefore, the target device 2 and the like can be prevented from being damaged by the reverse current.
It will be appreciated that the first resistor R1 can be used to provide an effective resistance to ground when an external power source is connected for power supply, thereby preventing the external power source from being directly short-circuited when connected.
Further, as shown in fig. 3, the battery protection circuit 1 further includes a first diode D1, and the output terminal of the external power switch circuit 30 is connected to the source of the first PMOS transistor Q1 through the first diode D1. It can be understood that, when the external power supply is connected for operation, the first diode D1 can be used to prevent the power supply battery 10 from flowing backward to the external power supply after the power supply battery 10 is replaced with a new one, so as to ensure the safety of the device for providing the external power supply and the safety of the power supply system.
In this embodiment, as shown in fig. 4, the external power switch circuit 30 includes a second PMOS transistor Q2, a second resistor R2, a third resistor R3, and a first capacitor C1. Specifically, the external power interface 20 is connected to one end of the second resistor R2, one end of the first capacitor C1, and the source of the second PMOS transistor Q2, the other end of the second resistor R2 is grounded and connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the other end of the first capacitor C1 and the gate of the second PMOS transistor Q2, and the drain of the second PMOS transistor Q2 is connected to the source of the first PMOS transistor Q1.
Further, as shown in fig. 4, the external power switch circuit 30 further includes a second diode D2, wherein an anode of the second diode D2 is connected to the other end of the second resistor R2, and a cathode thereof is connected to the other end of the third resistor R3. It is understood that the second diode D2 can be used to provide a fast discharge path for the first capacitor C1, thereby speeding up the turn-off of the second PMOS transistor Q2 in the external power switch circuit 30.
It can be understood that the external power switch circuit 30 is mainly used to implement delayed turning on and accelerated turning off of the external power source to the power supply battery 10. The delayed turning on means that when an external power supply is connected, if the first PMOS transistor Q1 is not turned off in time, the external power supply may flow backward to the power supply battery 10 through the first PMOS transistor Q1, so that the power supply battery 10 and the first PMOS transistor Q1 are damaged. The on-time of the second PMOS transistor Q2 can be adjusted by the delay circuit formed by the first capacitor C1 and the third resistor R3, so that the second PMOS transistor Q2 is not turned on immediately after the external power is turned on, and thus, a sufficient off-time can be reserved for turning off the first PMOS transistor Q1, i.e., the purpose of delaying the on-state can be achieved.
The fast turn-off is an effect of keeping the second PMOS transistor Q2 turned on in a delayed manner when the external power supply is plugged and pulled out for a plurality of times. The turn-off time of the second PMOS transistor Q2 can be adjusted by the second resistor R2 and the first capacitor C1. Exemplarily, when the external power supply is quickly plugged in, under the action of the delay conducting circuit, the external power supply can be prevented from conducting the second PMOS transistor Q2 too quickly; when the external power source is quickly pulled out, the discharge circuit composed of the second resistor R2, the second diode D2, etc. can perform quick discharge to accelerate the turn-off time of the second PMOS transistor Q2.
Further, the external power switch circuit 30 may further include a voltage matching circuit 40, and the source of the first PMOS transistor Q1 is connected to the target device 2 through the voltage matching circuit 40. The voltage matching circuit 40 may be a DC-DC converter circuit (i.e., a DC-DC circuit) or a linear regulator circuit (i.e., an LDO circuit). For example, when the voltage matching circuit is used for step-down, the DC-DC circuit may employ, for example, a BUCK step-down circuit or a voltage conversion circuit. And when boosting is required, a BOOST circuit or the like may be employed. The voltage matching circuit 40 can match the voltage of the target device 2, which not only increases the application range of the battery protection circuit 1, but also matches the voltage of the target device 2 to improve the utilization rate of the system.
In this embodiment, the external power source interface 20 may include, but is not limited to, a USB interface, a Type-C interface, or a Lightning interface. The target device 2 is mainly some electronic devices which are powered by a battery and have an external power access interface, for example, the electronic devices may include, but are not limited to, a smart door lock, a bluetooth speaker, MP3, MP4, a bluetooth/wired dual-mode keyboard, and the like.
Exemplarily, taking the target device 2 as an intelligent door lock as an example, the operating voltage is usually about 4.5V-5.5V. If the power supply battery 10 is in a full state, its full voltage is about 6.4V, and when its voltage drops below 4V, it will affect the normal operation of the target device 2. At this time, the 5.0V external power supply needs to be connected to supply power, so that the intelligent door lock can be operated to open and close the door. The operation principle of the battery protection circuit 1 will be explained below.
(1) When the power supply battery 10 works normally (i.e. is connected positively), the external power supply is not connected, at this time, the first PMOS transistor Q1 is in a conducting state, and the power supply battery 10 supplies power to the intelligent door lock normally.
(2) When the power supply battery 10 is reversely connected, the external power supply is not connected, at this time, the first PMOS transistor Q1 is cut off, and the power supply path of the power supply battery 10 is cut off, so that no power is supplied.
(3) When the power supply battery 10 cannot work normally, the external power supply is connected through the external power interface, at this time, the first PMOS transistor Q1 is in an off state, and since the source-gate voltage of the second PMOS transistor Q2 is greater than 0, and at this time, greater than the on-state voltage of the second PMOS transistor Q2, the second PMOS transistor Q2 is turned on, and switched to the external power supply for supplying power.
(4) When the power supply battery 10 is restored to full power and normally operates, the second diode D2 can prevent the power supply battery 10 from flowing backward through the power supply path of the external power source. In addition, a delay circuit and a quick discharge circuit formed by the second resistor R2, the third resistor R3, the first capacitor C1, the second diode D2 and the like can ensure that no potential safety hazard is caused to the system even if an external power supply is not pulled out in time, so that the safety performance of the whole system is improved.
Through the battery protection circuit of the embodiment, when the system power supply battery of the target device is completely consumed, the external power supply can be accessed to safely supply power through the reserved interface, so that the reverse connection protection function of the power supply battery is increased, the two power supply circuits are not influenced mutually, the safety of the whole power supply system is improved, and the like. Compared with the first scheme in the prior art, a diode for generating useless power can be omitted, so that the power consumption of the system is reduced; compared with the second scheme in the prior art, a switch circuit and the like are built through low-cost basic devices without increasing a voltage matching circuit, so that the using area of the PCB can be reduced, the design complexity and the hardware cost can be reduced, and the practicability is good.
Example 2
Referring to fig. 5, based on the battery protection circuit of embodiment 1, the present embodiment provides a power supply system 100 for supplying power to a device having a battery circuit and an external power supply circuit capable of accessing an external power source. The power supply system 100 includes a target device 2 and a battery protection circuit 1, where the battery protection circuit includes a power supply battery 10, an external power interface 20, a first PMOS transistor Q1, a first resistor R1, and an external power switch circuit 30.
Specifically, the positive electrode of the power supply battery 10 is connected to the drain of the first PMOS transistor Q1, and the negative electrode thereof is grounded and connected to one end of the first resistor R1. The other end of the external power interface 20 and the other end of the first resistor R1 are both connected to the gate of the first PMOS transistor Q1, and the source of the first PMOS transistor Q1 is connected to the target device 2 for providing a system power.
The input end of the external power supply switch circuit 30 is connected to the external power supply interface 20, the output end of the external power supply switch circuit is connected to the source electrode of the first PMOS transistor Q1, and the external power supply interface 20 is used for accessing an external power supply when the power supply battery 10 does not work.
Further, as shown in fig. 6, the power supply system 100 further includes a voltage matching circuit 40, and the source of the first PMOS transistor Q1 is connected to the target device 2 through the voltage matching circuit 40.
Further, the power supply system 100 further includes a first diode D1, and the output terminal of the external power switch circuit 30 is connected to the source of the first PMOS transistor Q1 through the first diode D1.
The battery protection circuit 1 of the present embodiment corresponds to the battery protection circuit of embodiment 1, and the options of the battery protection circuit of embodiment 1 are also applicable to the battery protection circuit 1 of the present embodiment, so detailed description thereof will be omitted.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above-mentioned invention numbers are merely for description and do not represent the merits of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (6)
1. A battery protection circuit, comprising: the power supply circuit comprises a power supply battery, an external power supply interface, a first PMOS (P-channel metal oxide semiconductor) tube, a first resistor, an external power supply switch circuit, a first diode and a second diode;
the anode of the power supply battery is connected with the drain electrode of the first PMOS tube, and the cathode of the power supply battery is grounded and connected with one end of the first resistor;
the other end of the external power supply interface and the other end of the first resistor are both connected to the grid electrode of the first PMOS tube, and the source electrode of the first PMOS tube is used for being connected with target equipment to provide a system power supply for the target equipment;
the input end of the external power supply switch circuit is connected with the external power supply interface, the output end of the external power supply switch circuit is connected with the source electrode of the first PMOS tube through the first diode, and the external power supply interface is used for being connected with an external power supply when the power supply battery does not work;
the external power supply switch circuit comprises a second PMOS tube, a second resistor, a third resistor and a first capacitor; the external power supply interface is respectively connected with one end of the second resistor, one end of the first capacitor and the source electrode of the second PMOS tube, the other end of the second resistor is grounded and connected with one end of the third resistor, the other end of the third resistor is respectively connected with the other end of the first capacitor and the grid electrode of the second PMOS tube, and the drain electrode of the second PMOS tube is connected with the source electrode of the first PMOS tube; and the anode of the second diode is connected with the other end of the second resistor, and the cathode of the second diode is connected with the other end of the third resistor.
2. The battery protection circuit of claim 1, further comprising: and the source electrode of the first PMOS tube is connected to the target equipment through the voltage matching circuit.
3. The battery protection circuit of claim 2, wherein the voltage matching circuit is a DC-DC circuit or a linear regulation circuit.
4. The battery protection circuit of claim 1, wherein the external power interface is a USB interface, a Type-C interface, or a Lightning interface.
5. A power supply system, comprising: the battery protection circuit comprises a power supply battery, an external power supply interface, a first PMOS (P-channel metal oxide semiconductor) tube, a first resistor, an external power supply switch circuit, a first diode and a second diode;
the anode of the power supply battery is connected with the drain electrode of the first PMOS tube, and the cathode of the power supply battery is grounded and connected with one end of the first resistor;
the other end of the external power supply interface and the other end of the first resistor are both connected to the grid electrode of the first PMOS tube, and the source electrode of the first PMOS tube is connected with the target equipment to provide a system power supply;
the input end of the external power supply switch circuit is connected with the external power supply interface, the output end of the external power supply switch circuit is connected with the source electrode of the first PMOS tube through the first diode, and the external power supply interface is used for being connected with an external power supply when the power supply battery does not work;
the external power supply switch circuit comprises a second PMOS tube, a second resistor, a third resistor and a first capacitor; the external power supply interface is respectively connected with one end of the second resistor, one end of the first capacitor and the source electrode of the second PMOS tube, the other end of the second resistor is grounded and connected with one end of the third resistor, the other end of the third resistor is respectively connected with the other end of the first capacitor and the grid electrode of the second PMOS tube, and the drain electrode of the second PMOS tube is connected with the source electrode of the first PMOS tube; and the anode of the second diode is connected with the other end of the second resistor, and the cathode of the second diode is connected with the other end of the third resistor.
6. The power supply system of claim 5, further comprising: and the source electrode of the first PMOS tube is connected to the target equipment through the voltage matching circuit.
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| CN110970961B (en) * | 2018-12-06 | 2021-06-08 | 宁德时代新能源科技股份有限公司 | Power consumption protection circuit |
| CN109581227A (en) * | 2019-01-24 | 2019-04-05 | 广东科徕尼智能科技有限公司 | A kind of intelligent door lock energy-saving voltage detection circuit |
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| CN104979891A (en) * | 2015-08-05 | 2015-10-14 | 毛建仁 | Battery power supply control circuit with activation function |
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| FR2798014B1 (en) * | 1999-08-31 | 2002-03-29 | St Microelectronics Sa | SUPPLY CIRCUIT WITH VOLTAGE SELECTOR |
| CN201985617U (en) * | 2011-02-24 | 2011-09-21 | 广州视源电子科技有限公司 | Switching circuit of internal power supply and external power supply |
| CN203243032U (en) * | 2013-03-29 | 2013-10-16 | 青岛海信移动通信技术股份有限公司 | Anti-overshoot protection circuit for power supply, and mobile terminal |
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| CN104979891A (en) * | 2015-08-05 | 2015-10-14 | 毛建仁 | Battery power supply control circuit with activation function |
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