CN205544567U - External power and battery powered automatic switch -over circuit - Google Patents

External power and battery powered automatic switch -over circuit Download PDF

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Publication number
CN205544567U
CN205544567U CN201620133905.0U CN201620133905U CN205544567U CN 205544567 U CN205544567 U CN 205544567U CN 201620133905 U CN201620133905 U CN 201620133905U CN 205544567 U CN205544567 U CN 205544567U
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China
Prior art keywords
diode
voltage stabilizing
automatic switch
external power
output
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CN201620133905.0U
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Chinese (zh)
Inventor
宁立红
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XI'AN CANGSHI ELECTRONIC TECHNOLOGY Co Ltd
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XI'AN CANGSHI ELECTRONIC TECHNOLOGY Co Ltd
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Priority to CN201620133905.0U priority Critical patent/CN205544567U/en
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Abstract

The utility model discloses an external power and battery powered automatic switch -over circuit comprise automatic switch -over module and the voltage stabilizing module who establishes ties. Electricity connection each other between each component is constituteed by external power source, lithium cell, resistance, diode A, diode B, field effect transistor to the automatic switch -over module. External power source is through diode A to output, other end ground connection is connected with diode A is anodal to the one end of resistance, the lithium cell is to field effect transistor, then to the output behind diode B. Voltage stabilizing module constitutes electricity connection each other between each component by steady voltage chip, farad capacitor, filter capacitance, it is parallelly connected between farad capacitor and the filter capacitance, play the filtering, the DC power supply of steady voltage chip after with the steady voltage is defeated to the output. The utility model is suitable for a need the power supply system of external power or battery powered automatic switch -over, direct current power supply system that this automatic switch -over circuit found has with low costsly, and the interference killing feature is strong, advantages such as job stabilization.

Description

A kind of externally fed and battery powered automatic switch-over circuit
Technical field
This utility model relates to externally fed and battery powered automatic switchover technology, is the automatic switch-over circuit of two kinds of power supply modes.
Background technology
In some need battery powered low-power consumption application, in order to extend the service life of battery, the most all using power supply management chip and super low-power consumption processor, cause processor performance to be restricted, product cost is higher.
Utility model content
The purpose of this utility model is, overcomes the short deficiency of battery of tradition method of supplying power to, it is provided that a kind of can extend that battery, capacity of resisting disturbance be strong, the new type auto switching circuit of working stability, low cost.
The technical solution of the utility model is:
This utility model system one externally fed and battery powered automatic switch-over circuit, including: automatic switching module and Voltage stabilizing module.These two block coupled in series electrical connections.
Described automatic switching module, is made up of external power source, lithium battery, resistance, diode A, diode B, field effect transistor.Described external power source, is accessed by socket, to outfan after diode A;Resistance (R101) one end is connected with diode A (D101) positive pole, other end ground connection;Described lithium battery, to field effect transistor after diode B, arrives outfan then;The other end ground connection of lithium battery.
Described Voltage stabilizing module, it is made up of voltage stabilizing chip, farad capacitor and filter capacitor A and filter capacitor B, it is sequentially connected electrically between each components and parts, wherein in parallel between farad capacitor (C101), filter capacitor A (C102), filter capacitor B (C103), play filter action;The Vin end of voltage stabilizing chip (U2) is connected with outfan (output), and the DC source after voltage stabilizing is exported vdd terminal by the Vout end of voltage stabilizing chip (U2);The Vss end ground connection of voltage stabilizing chip (U2).
This automatic switch-over circuit, in the case of outside plant-grid connection, automatically cuts off battery and powers, and with external power source to system power supply, switches fast and reliable, thus saves battery power, and low cost, life-span length, capacity of resisting disturbance are strong, working stability.
With embodiment, this utility model is described further below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is that externally fed and the battery of the present embodiment is powered the 3V DC power-supply circuit schematic diagram automatically switched;
Fig. 2 is that externally fed and the battery of the present embodiment is powered the 3V DC power-supply circuit figure automatically switched;
Fig. 3 is that externally fed and the battery of the present embodiment is powered the Voltage stabilizing module circuit theory of the 3V direct current supply automatically switched.
Detailed description of the invention
A kind of externally fed of embodiment and battery are powered the 3V DC power-supply circuit automatically switched
Fig. 1 shows that the externally fed of the present embodiment and battery are powered the 3V DC power-supply circuit automatically switched.
When external power source and battery are concurrently accessed, external power source for electrically disconnected, is input to mu balanced circuit by battery by switching circuit, exports feed system load after voltage stabilizing again.
Fig. 2 shows that the present embodiment externally fed and battery are powered the circuit structure principle of automatic module of the 3V DC power-supply circuit automatically switched.
Outside 5V power supply is powered, and is accessed by socket J1, and 3.6V lithium battery is accessed by socket J2.D101 is Schottky diode A, prevents battery from powering and pours in down a chimney to externally fed;D102 is Schottky diode B, prevents from charging the battery;R101 is resistance, and dividing potential drop thereon determines whether field effect transistor Q101 turns on.Q101 is the metal-oxide-semiconductor of P-channel, when externally fed does not access, Q101 grid is low level, so drain electrode and source conduction, 3.6V cell voltage is exported output end, and when externally fed accesses, Q101 grid is high level, so drain electrode and source electrode end, output of being powered by outside 5V is to output end.
Fig. 3 shows that the present embodiment externally fed and battery are powered the Voltage stabilizing module circuit theory of the 3V DC power-supply circuit automatically switched.
The output end of switching circuit is connected to the input end of mu balanced circuit, U2 is three-terminal voltage-stabilizing chip, voltage stabilizing chip Vin end (3 end) input direct-current is powered, and the 3V unidirectional current through voltage stabilizing is exported vdd terminal, Vss end (1 end) ground connection by Vout end (2 end);C101 is electrochemical capacitor, provides power supply to support when system power failure;C102, C103 are filter capacitor A and filter capacitor B respectively.

Claims (1)

1. an externally fed and battery powered automatic switch-over circuit, it is characterised in that: include automatic switching module and the Voltage stabilizing module front and back electrically connected;
Described automatic switching module, is made up of external power source, lithium battery, resistance (R101), diode A (D101), diode B (D102), field effect transistor (Q101), is electrically connected to each other between each element;External power source is accessed by socket (J1), to outfan (output) after diode A (D101);Resistance (R101) one end is connected with diode A (D101) positive pole, other end ground connection;Lithium battery is accessed by socket (J2), to field effect transistor (Q101) after diode B (D102), then arrives outfan (output);The other end ground connection of lithium battery;
Described Voltage stabilizing module, is made up of voltage stabilizing chip (U2), farad capacitor (C101), filter capacitor A (C102) and filter capacitor B (C103), is electrically connected to each other between each element;Wherein in parallel between farad capacitor (C101) and filter capacitor A (C102), filter capacitor B (C103), play filter action;The Vin end of voltage stabilizing chip (U2) is connected with outfan (output), and the DC source after voltage stabilizing is exported vdd terminal by the Vout end of voltage stabilizing chip (U2);The Vss end ground connection of voltage stabilizing chip (U2).
CN201620133905.0U 2016-02-23 2016-02-23 External power and battery powered automatic switch -over circuit Active CN205544567U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620133905.0U CN205544567U (en) 2016-02-23 2016-02-23 External power and battery powered automatic switch -over circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620133905.0U CN205544567U (en) 2016-02-23 2016-02-23 External power and battery powered automatic switch -over circuit

Publications (1)

Publication Number Publication Date
CN205544567U true CN205544567U (en) 2016-08-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620133905.0U Active CN205544567U (en) 2016-02-23 2016-02-23 External power and battery powered automatic switch -over circuit

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CN (1) CN205544567U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106816951A (en) * 2016-10-18 2017-06-09 广东探金电子科技有限公司 A kind of seamless automatic battery switching circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106816951A (en) * 2016-10-18 2017-06-09 广东探金电子科技有限公司 A kind of seamless automatic battery switching circuit

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