CN208316403U - There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit - Google Patents
There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit Download PDFInfo
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- CN208316403U CN208316403U CN201820911759.9U CN201820911759U CN208316403U CN 208316403 U CN208316403 U CN 208316403U CN 201820911759 U CN201820911759 U CN 201820911759U CN 208316403 U CN208316403 U CN 208316403U
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- feeder ear
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Abstract
The utility model discloses one kind there is counnter attack to fill power supply to automatically switch to belong to electronic technology field without crushing output circuit, including the first feeder ear, the second feeder ear, power supply unit and power supply are automatically switched without crushing output circuit；The power supply automatically switches without crushing output circuit to include reducing transformer U2, field-effect tube Q1, Q2 and Q3；The anode of first feeder ear is connect with the input terminal of U2, and the voltage output end of U2 connect with power supply unit respectively, connect with the drain electrode of Q1, and the drain electrode of the ground terminal and Q3 of U2 connects, the source electrode ground connection of Q3；The grid of Q3 is connect with the grid of the grid of Q1, Q2 respectively, and the source electrode of Q1 and the source electrode of Q2 connect, and the drain electrode of Q2 is connect with the second feeder ear anode；First feeder ear, the second feeder ear cathode be grounded.The circuit makes output voltage that there is continuity to guarantee equipment the operation is stable in power switching, and can prevent from instead filling the damage for causing loss and device between electric current, keeps output voltage more stable.
Description
Technical field
The utility model relates to electronic technology fields, in particular to a kind of to have counnter attack filling power supply automatic switchover defeated without crushing
Circuit out.
Background technique
In fields such as heat supply, power supplies, equipment generally uses battery to power, and cell damage or electricity, which exhaust, causes equipment can not
It uses.In order to avoid the damage of equipment, guarantee that service life of equipment, the quality of reliability and output voltage to power supply propose
Higher requirement.For example, cutting battery power supply is automatically switched when alternating current power-off by hardware when equipment has mains-supplied
It powers to battery；Voltage output is exported using no crushing, improves power supply quality etc..
Currently, power switching circuit use diode unilateral conduction principle carry out equipment power supply, metal-oxide-semiconductor switching with
And relay switching etc..Have a disadvantage in that: diode with 0.3-1V differential pressure characteristics and be affected by temperature it is larger, therefore generate
Crushing and output voltage wild effect cause relay switching to have lag characteristic, cause the discontinuity of power supply, and fill without anti-
Protection.
Utility model content
The utility model aim is that providing a kind of power with counnter attack filling automatically switches without crushing output circuit, to guarantee
Power switching circuit has anti-filling defencive function.
In order to achieve the above object, the utility model using a kind of there is counnter attack filling power supply to automatically switch to export electricity without crushing
Road, comprising: the first feeder ear, the second feeder ear, power supply unit and power supply are automatically switched without crushing output circuit；The power supply
Automatically switch without crushing output circuit to include reducing transformer U2, field-effect tube Q1, field-effect tube Q2 and field-effect tube Q3；
First feeder ear anode connect with the input terminal of reducing transformer U2, the voltage output end of reducing transformer U2 respectively with power supply
Equipment connection is connect with the drain electrode of field-effect tube Q1, and the ground terminal of reducing transformer U2 is connect with the drain electrode of field-effect tube Q3, field-effect
The source electrode of pipe Q3 is grounded；
The grid of field-effect tube Q3 is connect with the grid of the grid of field-effect tube Q1, field-effect tube Q2 respectively, field-effect tube
The source electrode of Q1 is connect with the source electrode of field-effect tube Q2, and the drain electrode of field-effect tube Q2 is connect with the anode of the second feeder ear；
The cathode of first feeder ear, the second feeder ear cathode be grounded.
Preferably, the grid of the field-effect tube Q3 is also connect, with the one of resistance R103 respectively with one end of resistance R102
End connection, the other end of resistance R102 are connect with the first feeder ear anode, the other end ground connection of resistance R103.
Preferably, first feeder ear is mains-supplied, and the second feeder ear is battery power supply.
Preferably, the field-effect tube Q1, field-effect tube Q2 and field-effect tube Q3 are metal-oxide-semiconductor.
Preferably, the power supply unit includes calorimeter, water meter, ammeter or gas meter, flow meter.
Compared with prior art, there are following technical effects for the utility model: automatic switchover nothing provided by the utility model
Crushing output circuit is when the first feeder ear is powered, field-effect tube Q3 conducting, field-effect tube Q1, field-effect tube Q2 cut-off, decompression
The voltage output end of device U2 exports the voltage of the first feeder ear to power supply unit, utilizes the pass of field-effect tube Q1, field-effect tube Q2
The current flowing backwards of the disconnected output end output for placing reducing transformer U2 are to the second feeder ear.In the power-off of the first feeder ear, field-effect tube
Q3 cut-off, field-effect tube Q1, field-effect tube Q2 conducting, the voltage that the voltage output end of reducing transformer U2 exports the second feeder ear extremely supply
There is the output end for preventing reducing transformer U2 to export current flowing backwards to the first feeder ear for electric equipment, the cut-off of field-effect tube Q3.
Detailed description of the invention
With reference to the accompanying drawing, specific embodiment of the present utility model is described in detail:
Fig. 1 is a kind of with functional block diagram of the counnter attack filling power supply automatic switchover without crushing output circuit；
Fig. 2 is a kind of with topology diagram of the counnter attack filling power supply automatic switchover without crushing output circuit.
Specific embodiment
In order to further explain the feature of the utility model, please refer to detailed description below in connection with the utility model with
Attached drawing.Institute's attached drawing is only for reference and purposes of discussion, is not used to limit the protection scope of the utility model.
As shown in Figure 1 to Figure 2, present embodiment discloses one kind there is counnter attack to fill power supply to automatically switch to export electricity without crushing
Road, including the first feeder ear P1, the second feeder ear P3, power supply unit and power supply are automatically switched without crushing output circuit；It is described
Power supply automatically switches without crushing output circuit to include reducing transformer U2, field-effect tube Q1, field-effect tube Q2 and field-effect tube Q3；
The pin 1(anode of first feeder ear P1) connect with the pin 1 of reducing transformer U2, the pin 5 of reducing transformer U2 respectively with
Power supply unit connection is connect with the drain electrode of field-effect tube Q1, and the pin 2 of reducing transformer U2 is connect with the drain electrode of field-effect tube Q3, field
The source electrode of effect pipe Q3 is grounded；
The grid of field-effect tube Q3 connect with the grid of field-effect tube Q1 respectively, connect with the grid of field-effect tube Q2, with
One end connection of resistance R102 is connect with one end of resistance R103, and the other end of resistance R102 is with the first feeder ear P1's
Pin 1(anode) connection, the other end ground connection of resistance R103；
The source electrode of field-effect tube Q1 is connect with the source electrode of field-effect tube Q2, the drain electrode of field-effect tube Q2 and the second feeder ear P3
Pin 1(anode) connection；
The pin 2(cathode of first feeder ear P1), the pin 2(cathode of the second feeder ear P3) be grounded.
Further, the first feeder ear is mains-supplied, and the second feeder ear is battery power supply.
Further, field-effect tube Q1, field-effect tube Q2 and field-effect tube Q3 are metal-oxide-semiconductor.
Further, power supply unit includes but is not limited to calorimeter, water meter, ammeter, gas meter, flow meter etc..
It is provided in this embodiment a kind of with working principle of the counnter attack filling power supply automatic switchover without crushing output circuit are as follows:
When the first feeder ear P1 power supply, Q3 conducting, Q1 and Q2 cut-off, the end VOUT of reducing transformer U2 export the first feeder ear
Voltage be supplied to power supply unit, the shutdown of Q1 and Q2 have the work of the current flowing backwards that prevent VOUT from exporting to the second feeder ear
With；When the power-off of the first feeder ear, Q3 is by Q1 and Q2 conducting, the end VOUT of reducing transformer U2 exports the voltage of the second feeder ear
To power supply unit, Q3 by the current flowing backwards for having the function of preventing VOUT from exporting to the first feeder ear.
In addition, power supply automatically switches to make power supply with hard by the grid of the grid and Q2 that control Q1 without crushing output circuit
Part automatic switching function, and with no crushing voltage output characteristics when metal-oxide-semiconductor Q1, Q2 conducting.
A kind of power supply having with counnter attack filling power supply automatic switchover without crushing output circuit provided in this embodiment is automatic
Handoff functionality, and make output voltage that there is continuity to guarantee equipment the operation is stable in power switching, it solves using diode
Crushing phenomenon caused by concatenation prevents from instead filling the damage for causing loss and device between electric current again, keeps output voltage more stable.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (5)
- Automatically switch 1. there is one kind counnter attack to fill power supply without crushing output circuit characterized by comprising the first feeder ear, the Two feeder ears, power supply unit and power supply are automatically switched without crushing output circuit；The power supply automatically switches to export electricity without crushing Road includes reducing transformer U2, field-effect tube Q1, field-effect tube Q2 and field-effect tube Q3；First feeder ear anode connect with the input terminal of reducing transformer U2, the voltage output end of reducing transformer U2 respectively with power supply unit Connection is connect with the drain electrode of field-effect tube Q1, and the ground terminal of reducing transformer U2 is connect with the drain electrode of field-effect tube Q3, field-effect tube Q3 Source electrode ground connection；The grid of field-effect tube Q3 is connect with the grid of the grid of field-effect tube Q1, field-effect tube Q2 respectively, field-effect tube Q1's Source electrode is connect with the source electrode of field-effect tube Q2, and the drain electrode of field-effect tube Q2 is connect with the anode of the second feeder ear；The cathode of first feeder ear, the second feeder ear cathode be grounded.
- 2. there is counnter attack to fill power supply as described in claim 1 to automatically switch without crushing output circuit, which is characterized in that the field The grid of effect pipe Q3 also connect respectively with one end of resistance R102, connect with one end of resistance R103, and resistance R102's is another End is connect with the first feeder ear anode, the other end ground connection of resistance R103.
- 3. there is counnter attack to fill power supply as described in claim 1 to automatically switch without crushing output circuit, which is characterized in that described the One feeder ear is mains-supplied, and the second feeder ear is battery power supply.
- 4. there is counnter attack to fill power supply as described in claim 1 to automatically switch without crushing output circuit, which is characterized in that the field Effect pipe Q1, field-effect tube Q2 and field-effect tube Q3 are metal-oxide-semiconductor.
- 5. there is counnter attack to fill power supply as described in claim 1 to automatically switch without crushing output circuit, which is characterized in that the confession Electric equipment includes calorimeter, water meter, ammeter or gas meter, flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820911759.9U CN208316403U (en) | 2018-06-11 | 2018-06-11 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820911759.9U CN208316403U (en) | 2018-06-11 | 2018-06-11 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208316403U true CN208316403U (en) | 2019-01-01 |
Family
ID=64708121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820911759.9U Active CN208316403U (en) | 2018-06-11 | 2018-06-11 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208316403U (en) |
-
2018
- 2018-06-11 CN CN201820911759.9U patent/CN208316403U/en active Active
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