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Power automatic switching circuit

A switching circuit, automatic power supply technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of poor utilization and high cost of power switching circuits, saving design costs, improving power utilization, and reducing open junctions. The effect of voltage loss

Pending Publication Date: 2019-06-04
福州码灵微电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, it is necessary to provide an automatic power switching circuit to solve the problems of high cost and poor utilization of existing power switching circuits

Method used

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Embodiment Construction

[0023] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0024] see Figure 1 to Figure 5 , the present embodiment provides a power supply automatic switching circuit, comprising a first voltage terminal AVDDL, a second voltage terminal AVDDH, a voltage output terminal AVDDX, and a negative pole of the power supply AVSS, the first voltage terminal is connected to the current input terminal of the reference current source, and the reference current The current output terminal of the source is connected with the reference current input terminal of the first current mirror, the mirror current input terminal of the first current mirror is connected with the reference current output terminal of the second current mirror, and the first mirror current output terminal of the second current mirror is...

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Abstract

The invention discloses a power automatic switching circuit, which comprises a first voltage terminal, a second voltage terminal, a voltage output terminal and a power supply negative electrode, wherein the first voltage terminal is connected with a current input terminal of a reference current source; the current output terminal of the reference current source is connected with the reference current input terminal of a first current mirror; the mirror current input terminal of the first current mirror is connected to the reference current output terminal of a second current mirror; the firstmirror current output terminal of the second current mirror is the reverse-phase input terminal of an operational amplifier and the reference current input terminal of a third current mirror; the mirror current input terminal of the third current mirror is connected with the reference current output terminal of a fourth current mirror; and the mirror current output terminal of the fourth current mirror is connected with the mirror circuit input terminal of a fifth current mirror and the input terminal of a hysteresis comparison circuit. The power supply voltage is compared, low-power consumption power automatic switching is realized through a built-in current comparator, the power utilization rate is thus improved, and the hardware design cost of an electronic system is saved.

Description

technical field [0001] The invention relates to the field of power switching circuits, in particular to an automatic power switching circuit. Background technique [0002] In the field of consumer electronics, in order to realize the automatic switching design of the off-chip power supply, the traditional circuit is realized by discrete components, and two diodes need to be connected to realize the off-chip automatic switching, which will increase the PCB design area and the two discrete diodes. Cost, and will cause 0.3V ~ 0.7V diode open junction voltage loss, power utilization becomes worse. Contents of the invention [0003] Therefore, it is necessary to provide an automatic power switching circuit to solve the problems of high cost and poor utilization of the existing power switching circuit. [0004] In order to achieve the above object, the inventor provides a power supply automatic switching circuit, including a first voltage terminal, a second voltage terminal, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
CPCY04S20/20Y02B70/30
Inventor 黄文灿刘德佳汪孝晃王法翔熊良勇
Owner 福州码灵微电子科技有限公司