CN207353903U - A kind of main power source and stand-by power supply automatic switch-over circuit - Google Patents
A kind of main power source and stand-by power supply automatic switch-over circuit Download PDFInfo
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- CN207353903U CN207353903U CN201721124223.4U CN201721124223U CN207353903U CN 207353903 U CN207353903 U CN 207353903U CN 201721124223 U CN201721124223 U CN 201721124223U CN 207353903 U CN207353903 U CN 207353903U
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Abstract
The utility model discloses a kind of main power source and stand-by power supply automatic switch-over circuit.Including：Main power source, stand-by power supply and two identical power switch switching chips, are respectively the first switching chip and the second switching chip；Output terminal as automatic switch-over circuit after the output terminal of first switching chip is connected with the second output terminal for switching chip, the input terminal and Enable Pin of first switching chip are connected with the output terminal of main power source, and the input terminal and Enable Pin of the second switching chip are connected with the output terminal of stand-by power supply；When the Enable Pin of power switch switching chip detects that the output voltage of coupled power-supply device is greater than or equal to setting voltage, and power switch switching chip input terminal voltage higher than power switch switching chip output voltage when, the power switch switching chip conducting.Automatic switch-over circuit provided by the utility model has advantage low in energy consumption, efficient, cost is low, moreover, can ensure in power supply handoff procedure, electrical equipment does not power off.
Description
Technical field
It the utility model is related to and supply electrical domain, more particularly to a kind of main power source and stand-by power supply automatic switch-over circuit.
Background technology
In many electrical equipments, for example car networking terminal, power supply can select main power source, can also select electricity consumption
Stand-by power supply inside equipment, the circuit for being used to switch between main power source and stand-by power supply in the prior art are roughly divided into
Two kinds：It is a kind of as shown in Figure 1, the switching circuit of main power supply is realized using two IN4007 diodes, due to diode
Pressure drop is between 0.25-0.3V, although can so realize the switching of main power supply, be lost on power it is larger, when electric current reaches
During to 2A, the power of diode is 0.5W, generate heat than it is more serious, efficiency is low；Another kind using 2 PMOS tube as shown in Fig. 2, come
Realize the switching circuit of main power supply, and the circuit needs to use high current PMOS tube, shortcoming is that cost is higher.
Utility model content
The purpose of this utility model is to provide a kind of main power source and stand-by power supply automatic switch-over circuit, has efficient, work(
Consume the characteristics of low, cost is low.
To achieve the above object, the utility model provides following scheme：
A kind of main power source and stand-by power supply automatic switch-over circuit, the automatic switch-over circuit include：Main power source, stand-by power supply
The power switch switching chip identical with two, is denoted as the first switching chip and the second switching chip respectively；First switching
Output terminal as the automatic switch-over circuit after the output terminal of chip is connected with the output terminal of the described second switching chip, it is described
Output terminal of the input terminal and Enable Pin of first switching chip with the main power source is connected, the input of the second switching chip
End and output terminal of the Enable Pin with the stand-by power supply are connected；
The first switching chip Enable Pin detects that the output voltage of the main power source output terminal is greater than or equal to setting
Voltage, and the voltage of the first switching chip input terminal higher than the described first switching chip output voltage when, described the
One switching chip conducting, the voltage of the automatic switch-over circuit output terminal output is the described first electricity for switching chip output
Pressure；The second switching chip Enable Pin detects that the output voltage of the stand-by power supply output terminal is greater than or equal to setting electricity
Pressure, and it is described second switching chip input terminal voltage higher than described second switching chip output voltage when, described second
Switch chip conducting, the voltage of the automatic switch-over circuit output terminal output is the described second voltage for switching chip output.
Optionally, the model HX9001 of the power switch switching chip.
Optionally, the voltage that sets is 1.5V.
Optionally, the automatic switch-over circuit further includes the first capacitance and the second capacitance, and one end of first capacitance connects
It is connected between the main power source output terminal and the first switching chip input terminal, the other end ground connection of first capacitance, institute
The one end for stating the second capacitance is connected with the output terminal of the described first switching chip, the other end ground connection of second capacitance.
Optionally, the automatic switch-over circuit further includes the 3rd capacitance and the 4th capacitance, and one end of the 3rd capacitance connects
It is connected between the stand-by power supply output terminal and the second switching chip input terminal, the other end ground connection of the 3rd capacitance,
One end of 4th capacitance is connected with the output terminal of the described second switching chip, the other end ground connection of the 4th capacitance.
Optionally, the capacitance of first capacitance, the second capacitance, the 3rd capacitance and the 4th capacitance is 10 μ F.
Optionally, the main power source is storage battery.
Optionally, the stand-by power supply is lithium battery.
According to specific embodiment provided by the utility model, the utility model discloses following technique effect：This practicality is new
The main power source that type provides and stand-by power supply automatic switch-over circuit, switch chip using the power switch of two panels model HX9001,
The output terminal that two power switches are switched to chips links together, the input terminals of two power switches switching chips respectively with master
Power supply is connected with stand-by power supply, when first switching chip Enable Pin detect the output voltage of the main power source output terminal be more than or
When voltage equal to setting voltage, and the first switching chip input terminal switches the voltage of chip output higher than first, first cuts
Chip conducting is changed, the voltage of automatic switch-over circuit output terminal output is the first voltage for switching chip output；Second switching core
Piece Enable Pin detects that the output voltage of stand-by power supply output terminal is greater than or equal to setting voltage, and the second switching chip input terminal
Voltage higher than second switching chip output voltage when, second switching chip conducting, automatic switch-over circuit output terminal output
Voltage for second switching chip output voltage.Main power source provided by the utility model and stand-by power supply automatic switch-over circuit
The automatic switchover of main power source, stand-by power supply is realized by above-mentioned setting, switches chip as a result of power switch, with use
Diode or PMOS tube are compared, and have the advantage efficient, low in energy consumption, cost is low.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, drawings in the following description are only the utility model
Some embodiments, for those of ordinary skill in the art, without having to pay creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structure diagram of power supply switch circuit in the prior art；
Fig. 2 is the structure diagram of another power supply switch circuit in the prior art；
Fig. 3 is the structure diagram of the utility model embodiment main power source and stand-by power supply automatic switch-over circuit.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
The purpose of this utility model is to provide a kind of main power source and stand-by power supply automatic switch-over circuit, has efficient, work(
Consume the characteristics of low, cost is low.
To enable the above-mentioned purpose of the utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings and have
Body embodiment is described in further detail the utility model.
Fig. 3 is the structure diagram of the utility model embodiment main power source and stand-by power supply automatic switch-over circuit, such as Fig. 3 institutes
Show, main power source provided by the utility model includes with stand-by power supply automatic switch-over circuit：Main power source 301, stand-by power supply 302 and two
A identical power switch switching chip, is denoted as the first switching chip 303 and the second switching chip 304 respectively；Described first cuts
Change after the output terminal of chip 303 is connected with the output terminal of the described second switching chip 304 as the defeated of the automatic switch-over circuit
Outlet, the output terminal with the main power source 301 of input terminal and Enable Pin of the first switching chip 303 are connected, and described the
Output terminal of the input terminal and Enable Pin of two switching chips 304 with the stand-by power supply 302 is connected；
First switching, 303 Enable Pin of chip detects that the output voltage of 301 output terminal of main power source is more than or waits
In setting voltage, and the voltage of the first switching 303 input terminal of chip is higher than the electricity of the described first switching 303 output terminal of chip
During pressure, the first switching chip 303 turns on, and the voltage of the automatic switch-over circuit output terminal output is the described first switching core
The voltage of 303 output terminal of piece；Second switching, 304 Enable Pin of chip detects the output of 302 output terminal of stand-by power supply
Voltage is greater than or equal to setting voltage, and the voltage of the second switching 304 input terminal of chip is higher than the described second switching chip
During the voltage of 304 output terminals, the second switching chip 304 turns on, and the voltage of the automatic switch-over circuit output terminal output is
The voltage of second switching, 304 output terminal of chip.
Wherein, the model HX9001 of power switch switching chip, the voltage that sets is 1.5V.
Preferably, the automatic switch-over circuit further includes the first capacitance 305 and the second capacitance 306, first capacitance 305
One end be connected to 301 output terminal of main power source and first switching 303 input terminal of chip between, first capacitance 305
The other end is grounded, and one end of second capacitance 306 is connected with the output terminal of the described first switching chip 303, second electricity
Hold 306 other end ground connection.
Preferably, the automatic switch-over circuit further includes the 3rd capacitance 307 and the 4th capacitance 308, the 3rd capacitance 307
One end be connected to 302 output terminal of stand-by power supply and it is described second switching 304 input terminal of chip between, the 3rd capacitance
307 other end ground connection, the output terminal that one end of the 4th capacitance 308 switches chip 304 with described second are connected, and described the
The other end ground connection of four capacitances 308.
First capacitance 305, the second capacitance 306, the capacitance of the 3rd capacitance 307 and the 4th capacitance 308 may be configured as
10μF。
The main power source 301 can be storage battery.
The stand-by power supply 302 can be lithium battery.
When main power source 301 is first powered, then connects stand-by power supply 302, the input voltage of the first switching chip 303 is 5V,
The level of first switching 303 Enable Pin of chip is 5V (being more than 1.5V), before the first switching chip 303 turns on, the first switching core
The output voltage of the input terminal of piece 303 and the first switching chip 303 is 0, and the first switching chip 303 meets conducting bar at this time
Part, the output voltage after the first switching chip 303 turns on is 5V, is connected together due to both output terminals, first cuts
Changing the voltage of the output terminal of the second switching chip 304 after chip 303 turns on will be forced to be pulled upward to 5V, and second switches chip
304 input voltage is 4.2V, although the level of the second switching 304 Enable Pin of chip is 4.2V (being more than 1.5V), is unsatisfactory for
Input power is more than output voltage, therefore the second 304, switching core ends, and providing 5V at this time, after can only being depressured by main power source 301 supplies
Electricity；
When main power source 301 is not powered, the input voltage of the first switching chip 303 is 0V, and the first switching chip 303 is enabled
The level at end is 0V (being less than 1.5V), and at this time, the first switching chip 303 ends；Second switching chip 303 input voltage be
4.2V, the level of the second switching 304 Enable Pin of chip is 4.2V (being more than 1.5V), the output of the second switching chip 304 before conducting
Terminal voltage is 0, meets turn-on condition, so the second switching chip 304 turns on, by 302 lithium battery power supply of stand-by power supply；
In terminal first by 302 lithium battery power supply of stand-by power supply, then when plugging main power source 301, the first switching chip 303 it is defeated
It is 5V to enter voltage, and the level of the first switching 303 Enable Pin of chip is 5V (being more than 1.5V), and before the first switching chip 303 turns on
The voltage of output terminal is 4.2V, at this time, defeated after the first switching chip 303 meets that turn-on condition, the first switching chip 303 turn on
It is 5V to go out terminal voltage, and the output voltage of the second switching chip 304 will be essentially pulled up to 5V, and at this time, the second switching core 304 is unsatisfactory for leading
Input voltage in gating condition is more than output voltage, so the second switching chip 304 can end, at this time, reaches stand-by power supply 302
The effect switched to main power source 301.
Main power source provided by the utility model and stand-by power supply automatic switch-over circuit are in actual use, it is possible to achieve main electricity
The function that source is automatically switched with the stand-by power supply inside electrical equipment, when detecting main power source, preferentially using main power source, is being examined
When measuring no main power source, internal stand-by power supply is used.Moreover, voltage switching is normal in two kinds of power supply handoff procedures, uninterruptedly,
Electrical equipment is without reset phenomenon.Moreover, automatic switch-over circuit provided by the utility model employs power switch switching chip, with
Compared using diode or PMOS tube, there is the advantage efficient, low in energy consumption, cost is low.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Specific case used herein is set forth the principle and embodiment of the utility model, above example
Explanation be only intended to help to understand the method and its core concept of the utility model；Meanwhile for the general technology of this area
Personnel, according to the thought of the utility model, in specific embodiments and applications there will be changes.In conclusion
This specification content should not be construed as the limitation to the utility model.
Claims (8)
1. a kind of main power source and stand-by power supply automatic switch-over circuit, it is characterised in that the automatic switch-over circuit includes：Main electricity
Source, stand-by power supply and two identical power switch switching chips, are denoted as the first switching chip and the second switching chip respectively；Institute
State after the output terminal of the first switching chip is connected with the output terminal of the described second switching chip as the automatic switch-over circuit
Output terminal, described first, which switches the output terminal of the input terminal and Enable Pin of chip with the main power source, is connected, and described second cuts
The output terminal of the input terminal and Enable Pin of chip with the stand-by power supply is changed to be connected；
The Enable Pin of the first switching chip detects that the output voltage of the main power source output terminal is greater than or equal to setting electricity
Pressure, and it is described first switching chip input terminal voltage higher than described first switching chip output terminal voltage when, it is described
First switching chip conducting, the voltage of the automatic switch-over circuit output terminal output is the described first electricity for switching chip output
Pressure；The Enable Pin of the second switching chip detects that the output voltage of the stand-by power supply output terminal is greater than or equal to described set
Constant voltage, and it is described second switching chip input terminal voltage higher than described second switching chip output voltage when, it is described
Second switching chip conducting, the voltage of the automatic switch-over circuit output terminal output is the described second electricity for switching chip output
Pressure.
2. main power source according to claim 1 and stand-by power supply automatic switch-over circuit, it is characterised in that the power switch
Switch the model HX9001 of chip.
3. main power source according to claim 1 and stand-by power supply automatic switch-over circuit, it is characterised in that the setting voltage
For 1.5V.
4. main power source according to claim 1 and stand-by power supply automatic switch-over circuit, it is characterised in that the automatic switchover
Circuit further includes the first capacitance and the second capacitance, and one end of first capacitance is connected to the main power source output terminal and described the
Between one switching chip input terminal, the other end ground connection of first capacitance, one end of second capacitance is cut with described first
The output terminal for changing chip is connected, the other end ground connection of second capacitance.
5. main power source according to claim 4 and stand-by power supply automatic switch-over circuit, it is characterised in that the automatic switchover
Circuit further includes the 3rd capacitance and the 4th capacitance, one end of the 3rd capacitance be connected to the stand-by power supply output terminal with it is described
Between second switching chip input terminal, the other end ground connection of the 3rd capacitance, one end and described second of the 4th capacitance
The output terminal of switching chip is connected, the other end ground connection of the 4th capacitance.
6. main power source according to claim 5 and stand-by power supply automatic switch-over circuit, it is characterised in that first electricity
The capacitance of appearance, the second capacitance, the 3rd capacitance and the 4th capacitance is 10 μ F.
7. main power source according to claim 1 and stand-by power supply automatic switch-over circuit, it is characterised in that the main power source is
Storage battery.
8. main power source according to claim 1 and stand-by power supply automatic switch-over circuit, it is characterised in that the stand-by power supply
For lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124223.4U CN207353903U (en) | 2017-09-04 | 2017-09-04 | A kind of main power source and stand-by power supply automatic switch-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124223.4U CN207353903U (en) | 2017-09-04 | 2017-09-04 | A kind of main power source and stand-by power supply automatic switch-over circuit |
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| Publication Number | Publication Date |
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| CN207353903U true CN207353903U (en) | 2018-05-11 |
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| CN201721124223.4U Active CN207353903U (en) | 2017-09-04 | 2017-09-04 | A kind of main power source and stand-by power supply automatic switch-over circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465257A (en) * | 2017-09-04 | 2017-12-12 | 大唐融合通信无锡有限公司 | A kind of main power source and stand-by power supply automatic switch-over circuit |
-
2017
- 2017-09-04 CN CN201721124223.4U patent/CN207353903U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465257A (en) * | 2017-09-04 | 2017-12-12 | 大唐融合通信无锡有限公司 | A kind of main power source and stand-by power supply automatic switch-over circuit |
| CN107465257B (en) * | 2017-09-04 | 2024-02-13 | 大唐融合物联科技无锡有限公司 | Automatic switching circuit for main power supply and standby power supply |
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Address after: No. a212, No. 18, wisdom road, Huishan Economic Development Zone, Wuxi City, Jiangsu Province Patentee after: Datang integrated IOT technology Wuxi Co., Ltd Address before: 214000 Jiangsu province Wuxi City Linghu New District Road No. 200 Wu China Sensor Network International Innovation Park No. G1-206 Patentee before: DATANG TELECOM CONVERGENCE COMMUNICATIONS WUXI Co.,Ltd. |