Dual-power switching circuit

Abstract

A dual-power-supply switching circuit comprises a first power supply, a second power supply, a power supply switching unit and a power supply output end. The first power supply is electrically connected with the power supply output end; the second power supply is electrically connected with the power supply output end through the power supply switching unit; the first power supply is connected with the control input end of the power supply switching unit. Precise control over the dual-power supply circuit is achieved through the power supply switching unit, when the first power supply is powered on, it is ensured that the first power supply supplies power, the use efficiency of the second power supply is improved, the voltage drop from the second power supply to the output end is almost zero, and the service life of a battery is guaranteed to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the field of control circuits, and particularly relates to a dual power supply switching circuit. Background Art

[0002] At present, with the rapid development of electronic application products, the application demand for power supply devices has gradually increased, and the power supply methods of power supply devices have become more and more diverse; for example, the power supply method of TYP-C power supply + 4 dry batteries. However, in a conventional dual power supply switching circuit, the two power supply paths are connected to the power supply output end through diodes, which has problems of large voltage drop and affecting the service life of the battery. Summary of the Utility Model

[0003] The purpose of this application is to provide a dual power supply switching circuit to solve the technical problems described in the background art.

[0004] The technical solution adopted in this application is as follows:

[0005] A dual power supply switching circuit includes: a first power supply, a second power supply, a power supply switching unit, and a power supply output end; the first power supply is electrically connected to the power supply output end; the second power supply is electrically connected to the power supply output end through the power supply switching unit; the first power supply is connected to the control input end of the power supply switching unit.

[0006] Preferably, the power supply switching unit includes: a switching control module and a conduction and interruption module; the second power supply supplies power to the power supply output end through the conduction and interruption module, and the conduction and interruption module controls the conduction and interruption of the path between the second power supply and the power supply output end; the switching control module is electrically connected to the conduction and interruption module and controls the conduction / disconnection of the conduction and interruption module.

[0007] Preferably, the switching control module includes: a first switching element Q1 and a fourth switching element Q4; the first switching element Q1 is controlled by the first power supply, and the first switching element Q1 is electrically connected to the fourth switching element Q4 to control the conduction and interruption of the fourth switching element Q4; the fourth switching element Q4 controls the conduction and interruption of the conduction and interruption module.

[0008] Preferably, the conduction and interruption module includes a second switching element Q2, and the fourth switching element Q4 controls the conduction and interruption of the second switching element Q2.

[0009] Preferably, the switching control module further includes: a third switching element Q3, the third switching element Q3 is arranged on the path between the second power supply and the power supply output end, and the first power supply controls the conduction and interruption of the third switching element Q3.

[0010] Preferably, the third switching element Q3 is a P-channel field effect transistor.

[0011] Preferably, the first switching element Q1 is an NPN type triode, and the fourth switching element Q4 is a PNP type triode.

[0012] Preferably, the second switching element Q2 is a P-channel field effect transistor.

[0013] Preferably, the first power supply adopts any one of USB power supply and Type-C power supply; the first power supply supplies power to the power supply output terminal through the diode D1.

[0014] Preferably, the second power supply is powered by 4 dry batteries connected in series.

[0015] A dual power supply switching circuit involved in the present application, the advantages and positive effects of the present application are as follows: through the power supply switching unit, precise control of the dual power supply circuit is achieved. When the first power supply is powered on, it is ensured that the first power supply supplies power, improving the utilization efficiency of the second power supply, making the voltage drop from the second power supply to the output terminal almost zero, and maximizing the service life of the battery. Description of the Drawings

[0016] The drawings, as a part of the present application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 It is a connection diagram of functional modules of an embodiment of a dual power supply switching circuit.

[0018] Figure 2 It is a connection diagram of functional modules of another embodiment of a dual power supply switching circuit.

[0019] Figure 3 It is a circuit schematic diagram of an embodiment of a dual power supply switching circuit. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top", "bottom", "axial", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In the description of the present utility model, unless otherwise clearly defined, terms such as "setting", "installation", and "connection" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0024] As shown in the attached Figures 1-3 specification:

[0025] A dual - power - supply switching circuit includes: a first power supply, a second power supply, a power - supply switching unit, and a power - supply output terminal; the first power supply is electrically connected to the power - supply output terminal; the second power supply is electrically connected to the power - supply output terminal through the power - supply switching unit; the first power supply is connected to the control input terminal of the power - supply switching unit.

[0026] The working principle of a dual - power - supply switching circuit: When the first power supply supplies power and the second power supply is zero, the power - supply output terminal is electrically connected to the first power supply and directly outputs the voltage of the first power supply; when the first power supply is zero and the second power supply supplies power, the control input terminal of the power - supply switching unit receives the low - level signal of the first power supply, the power - supply switching unit conducts, and the power - supply output terminal is electrically connected to the second power supply and outputs the voltage of the second power supply; when the first power supply and the second power supply supply power simultaneously, the control input terminal of the power - supply switching unit receives the high - level signal of the first power supply, the power - supply switching unit disconnects, the circuit between the second power supply and the power - supply output terminal is not conducted, resulting in the second power supply being unable to supply power to the power - supply output terminal. At this time, the power - supply output terminal is electrically connected to the first power supply and outputs the voltage of the first power supply.

[0027] In this embodiment, a dual - power - supply switching circuit realizes precise control of the dual - power - supply circuit through the power - supply switching unit. When the first power supply has power, it ensures that the first power supply supplies power, improving the utilization efficiency of the second power supply.

[0028] Specifically, the power supply switching unit includes: a switching control module and a switching on / off module; the second power supply supplies power to the power supply output terminal through the switching on / off module, and the switching on / off module controls the connection and disconnection of the second power supply and the power supply output terminal; the switching control module is electrically connected to the switching on / off module and controls the conduction / disconnection of the switching on / off module.

[0029] Specifically, the switching control module includes: a first switching element Q1 and a fourth switching element Q4; the first switching element Q1 is controlled by the first power supply, and the first switching element Q1 is electrically connected to the fourth switching element Q4 to control the connection and disconnection of the fourth switching element Q4; the fourth switching element Q4 controls the connection and disconnection of the switching on / off module.

[0030] Specifically, the first switching element Q1 is an NPN-type triode and the fourth switching element Q4 is a PNP-type triode.

[0031] Specifically, the switching on / off module includes a second switching element Q2, and the fourth switching element Q4 controls the connection and disconnection of the second switching element Q2. When the first power supply is zero and the second power supply supplies power, the first switching element Q1 receives a low level and does not conduct, the fourth switching element Q4 receives a high level and does not conduct, and the controlled terminal of the second switching element Q2 is grounded. At this time, the second switching element Q2 is in a conducting state, and the second power supply supplies power to the power supply output terminal through the second switching element Q2.

[0032] Specifically, the second switching element Q2 is a P-channel field effect transistor.

[0033] Specifically, the switching control module further includes: a third switching element Q3, which is arranged on the path between the second power supply and the power supply output terminal, and the first power supply controls the connection and disconnection of the third switching element Q3. When the first power supply supplies power, the third switching element Q3 receives a high level and the third switching element Q3 disconnects, and the second power supply cannot supply power to the power supply output terminal through the third switching element Q3, thereby further ensuring that when the first power supply and the second power supply are both powered, the first power supply supplies power to the power supply output terminal.

[0034] Specifically, the third switching element Q3 is a P-channel field effect transistor.

[0035] Specifically, the first power supply adopts a wired power supply form, for example: USB power supply, Type-C power supply.

[0036] Specifically, the second power supply uses a dry battery for power supply, for example: powered by 4 series-connected dry batteries.

[0037] Specifically, the first power supply supplies power to the power supply output terminal through a diode D1.

[0038] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0039] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A dual-power switching circuit, characterized in that, Comprising: A first power supply, a second power supply, a power supply switching unit, and a power supply output terminal; The first power supply is electrically connected to the power supply output terminal; The second power supply is electrically connected to the power supply output terminal through the power supply switching unit; The first power supply is connected to the control input terminal of the power supply switching unit; the power supply switching unit includes: a switching control module and a switching on / off module; the second power supply supplies power to the power supply output terminal through the switching on / off module, and the switching on / off module controls the on / off of the path between the second power supply and the power supply output terminal; the switching control module is electrically connected to the switching on / off module to control the conduction / turn-off of the switching on / off module.

2. The dual-power switching circuit according to claim 1, characterized in that, The switching control module includes: a first switching element Q1 and a fourth switching element Q4; the first switching element Q1 is controlled by the first power supply, and the first switching element Q1 is electrically connected to the fourth switching element Q4 to control the on / off of the fourth switching element Q4; the fourth switching element Q4 controls the on / off of the switching on / off module.

3. The dual-power switching circuit according to claim 2, characterized in that, The switching on / off module includes a second switching element Q2, and the fourth switching element Q4 controls the on / off of the second switching element Q2.

4. The dual-power switching circuit according to claim 3, wherein The switching control module further includes: a third switching element Q3, the third switching element Q3 is disposed on the path between the second power supply and the power supply output terminal, and the first power supply controls the on / off of the third switching element Q3.

5. The dual-power switching circuit according to claim 4, characterized in that, The third switching element Q3 is a P-channel field effect transistor.

6. The dual-power switching circuit according to any one of claims 2-5, characterized in that The first switching element Q1 is an NPN-type triode, and the fourth switching element Q4 is a PNP-type triode.

7. The dual-power switching circuit according to any one of claims 3-5, characterized in that The second switching element Q2 is a P-channel field effect transistor.

8. The dual-power switching circuit according to claim 1, wherein The first power supply adopts any one of USB power supply and Type-C power supply; the first power supply supplies power to the power supply output terminal through a diode D1.

9. The dual-power switching circuit according to claim 1, wherein The second power supply is powered by 4 series-connected dry batteries.

Images