Low-voltage-drop power supply circuit

A power supply and low voltage drop technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of high reliability system safety hazards, complex circuits, and high power loss, and achieve automatic switching, simple and reliable circuits. , to avoid the effect of current backflow

Active Publication Date: 2019-03-15
中国航发控制系统研究所
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Problems solved by technology

In the traditional power combination scheme, the voltage drop in the circuit is relatively large. Under different working conditions, the power supply switching between the main power supply and the lithium battery power supply is mainly controlled by

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  • Low-voltage-drop power supply circuit

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[0019] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail in conjunction with specific embodiments and with reference to the accompanying drawings. The same parts are indicated by the same reference numerals.

[0020] The low-dropout power supply circuit includes a lithium battery module 1 and a main power module 2, and the output terminal of the lithium battery module 1 and the output terminal of the main power module 2 are connected to the power supply terminal of the external circuit 3 through a power switching circuit.

[0021] The power switching circuit includes a first switch circuit 4, a second switch circuit 5, and a third switch circuit 6. The output terminal of the lithium battery module 1 is connected to the first terminal 410 of the first switch circuit 4, and the first switch The second terminal 420 of the circuit 4 is connected to the second terminal 52...

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Abstract

The invention belongs to a power supply circuit, and specifically relates to a low-voltage-drop power supply circuit. The circuit comprises a lithium battery module and a main power module. An outputend of the lithium battery module and an output end of the main power module are connected with a power supply end of an external circuit through a power switching circuit. The power switching circuitincludes a first switching circuit, a second switching circuit and a third switching circuit. The output end of the lithium battery module is connected with the first end of the first switching circuit, and the second end of the first switching circuit is connected with the second end of the second switching circuit and the third end of the third switching circuit. The first end of the second switching circuit is connected with the first end of the third switching circuit, the third end of the second switching circuit is connected with the second end of the third switching circuit, and the second end of the third switch circuit is also connected with the output of the main power module. The low-voltage-drop power supply circuit of the invention can automatically switch the power supply mode between the main power supply and the lithium battery power supply under different working conditions through a pure analog circuit.

Description

technical field [0001] The invention belongs to a power supply circuit, in particular to a low voltage drop power supply circuit. Background technique [0002] For some critical systems that require uninterrupted power supply and high reliability, such as communication equipment, monitoring systems, etc., in addition to the main power supply, it is often necessary to design a lithium battery circuit as a backup power supply, which is merged with the main power supply and provides external power supply together. Equipment power supply, in order to prevent the main power supply from power failure in an unexpected situation, which will affect the external power supply equipment. In the traditional power combination scheme, the voltage drop in the circuit is large. Under different working conditions, the power supply switching between the main power supply and the lithium battery power supply is mainly controlled by the external logic judgment circuit or the signal generated by ...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCH02J9/06Y02B70/30Y04S20/20
Inventor 温铁钝张晓诚吴星王少永葛文哲张锐
Owner 中国航发控制系统研究所
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