CN207321109U - Acquisition terminal power supply feeds back protection circuit - Google Patents
Acquisition terminal power supply feeds back protection circuit Download PDFInfo
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- CN207321109U CN207321109U CN201721257570.4U CN201721257570U CN207321109U CN 207321109 U CN207321109 U CN 207321109U CN 201721257570 U CN201721257570 U CN 201721257570U CN 207321109 U CN207321109 U CN 207321109U
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Abstract
Acquisition terminal power supply feeds back protection circuit, including reference circuit, zero pole point circuit, TL431 and optocoupler composition controllable current backfeed loop and backfeed loop, the optocoupler composition controllable current backfeed loop includes voltage output end and adjustable current source, the reference circuit, the voltage of zero pole point electric circuit inspection voltage output end, according to the difference of voltage, feed back to adjustable current source, finally exported from backfeed loop, further include and protect circuit for the optocoupler of water conservancy diversion pilot, the optocoupler protection circuit is the first diode, the anode of first diode is connected with voltage output end, the cathode of first diode is connected with adjustable current source.The utility model has the advantages that：With avoiding passing through the scheme isolated antennas of complexity with power supply, only solve infringement of the exterior induced potential to the optocoupler of Switching Power Supply by a simple rectifier diode.
Description
Technical field
The utility model belongs to acquisition terminal field, and in particular to acquisition terminal power supply feeds back protection circuit.
Background technology
Existing acquisition terminal uses external antenna, easily by exterior lightning induction, with influencing power supply, with causing power supply phase
Height is floated for power supply, causes optocoupler VR excessive and damages.
The content of the invention
For deficiency of the prior art, the utility model provides acquisition terminal power supply feedback protection circuit, existing to solve
Some acquisition terminals use external antenna, easily by exterior lightning induction, with influencing power supply, are floated relative to power supply with causing power supply
Height, the problem of causing optocoupler VR excessive and damage.
The utility model is achieved through the following technical solutions.
Acquisition terminal power supply feedback protection circuit, including reference circuit, zero pole point circuit, TL431 and optocoupler composition are controllable
Current feedback loop and backfeed loop, optocoupler composition controllable current backfeed loop include voltage output end and adjustable current
Source, the reference circuit, the voltage of zero pole point electric circuit inspection voltage output end, according to the difference of voltage, feeds back to adjustable electric
Stream source, finally exports from backfeed loop, further includes and protects circuit for the optocoupler of water conservancy diversion pilot, and optocoupler protection circuit is
First diode, the anode of the first diode are connected with voltage output end, and the cathode of the first diode is connected with adjustable current source.
Circuit is protected by increasing optocoupler, is effectively protected optocoupler, avoids the Switching Power Supply failure caused by optocoupler damages.
Preferably, the reference circuit includes second resistance, the 4th resistance and the 6th resistance, the 6th resistance
One end ground connection, the other end of the 6th resistance connects one end of the 4th resistance, the other end connection second of the 4th resistance
One end of resistance, the other end of the second resistance connect the anode of the first diode.
Preferably, the zero pole point circuit includes the 5th resistance, the first capacitance and the second capacitance, the described the 5th electricity
The cathode of the first diode of resistance one end connection, one end of the 5th resistance other end the first capacitance of connection, described first
The other end of capacitance connects one end of the 4th resistance, and the second described capacitance one end connects the cathode of the first diode, the other end
Connect one end of the 4th resistance.
Preferably, the TL431 and optocoupler composition controllable current backfeed loop include first resistor, 3rd resistor,
First optocoupler, adjustable current source and the second diode, one end ground connection of the adjustable current source, the other end of adjustable current source
One end of 3rd resistor is connected, the other end of the 3rd resistor connects one end of first resistor, and the first resistor is another
One end connects the anode of the first diode, and second diodes in parallel is in the both ends of adjustable current source, first light
Coupling is connected in parallel on the both ends of 3rd resistor.
Preferably, the backfeed loop includes Switching Power Supply modulation chip FB, Switching Power Supply modulation chip
FB is connected with the first optocoupler.
Compared with prior art：With avoiding passing through the scheme isolated antennas of complexity with power supply, it is only simple by one
Rectifier diode solves infringement of the exterior induced potential to the optocoupler of Switching Power Supply.
Brief description of the drawings
Fig. 1 is that the circuit of the utility model connects block diagram.
Embodiment
Below in conjunction with the accompanying drawings with embodiment, the utility model is described further.
Acquisition terminal power supply feeds back protection circuit, including reference circuit 4, zero pole point circuit 5, TL431 and optocoupler composition can
Current feedback loop 2 and backfeed loop 1 are controlled, optocoupler composition controllable current backfeed loop 2 includes voltage output end Uout
With adjustable current source N1, the reference circuit 4, zero pole point circuit 5 detect the voltage of voltage output end Uout, according to voltage
Difference, feeds back to adjustable current source N1, is finally exported from backfeed loop 1, it is characterised in that further includes the light for water conservancy diversion pilot
Coupling protects circuit 3, and optocoupler protection circuit 3 is the first diode VD1, the anode and voltage output of the first diode VD1
Uout connections are held, the cathode of the first diode VD1 is connected with adjustable current source N1, and the reference circuit 4 includes second resistance
R2, the 4th resistance R4 and the 6th resistance R6, one end ground connection of the 6th resistance R6, the other end connection the of the 6th resistance R6
One end of four resistance R4, one end of the other end connection second resistance R2 of the 4th resistance R4, the second resistance R2
The other end connect the first diode VD1 anode, the zero pole point circuit 5 include the 5th resistance R5, the first capacitance C1 and
Second capacitance C2, the 5th described resistance R5 one end connect the cathode of the first diode VD1, the 5th resistance R5 other ends
Connecting one end of the first capacitance C1, the other end of the first capacitance C1 connects one end of the 4th resistance R4, and described second
Capacitance C2 one end connects the cathode of the first diode VD1, and the other end connects one end of the 4th resistance R4, the TL431 and light
Coupling composition controllable current backfeed loop includes first resistor R1,3rd resistor R3, the first optocoupler E1, adjustable current source N1 and second
One end ground connection of diode VD2, the adjustable current source N1, the one of the other end connection 3rd resistor R3 of adjustable current source N1
End, one end of the other end connection first resistor R1 of the 3rd resistor R3, first resistor R1 other ends connection the
The anode of one diode VD1, the second diode VD2 are connected in parallel on the both ends of adjustable current source N1, first optocoupler
E1 is connected in parallel on the both ends of 3rd resistor R3, and the backfeed loop 1 includes Switching Power Supply modulation chip FB, the Switching Power Supply
Modulation chip FB is connected with the first optocoupler E1.
The anode of voltage output end Uout and the first diode VD1 are same endpoint,
The sampling switch electric power output voltage of reference circuit 4, second resistance R2, the 4th resistance R4 and the 6th resistance R6 are adjusted
Output voltage, is controlled the voltage of the 6th resistance R6 other ends above and below 2.5V by partial pressure.
Reference voltage 2.5V in the 1st foot of the adjustable current source N1 of TL431 and optocoupler composition controllable current backfeed loop 2
Compared with another terminal voltage of the 6th resistance R6 of reference circuit 4, to control the electric current by the first optocoupler E1, wherein the first electricity
Resistance R1 plays limit value and flows through optocoupler electric current, and secondary side signal is transformed into primary side by the first optocoupler E1, with electric current pattern, the
Three resistance R3 are bypass resistance, and the second diodes of TVS VD2 protects the 2nd and 3 feet of adjustable current source N1.
Zero pole point circuit 5, including the 5th resistance R5, the first capacitance C1 and the second capacitance C2, control the circuit of secondary side to increase
Benefit, makes feedback control in optimum state.
Backfeed loop 1 is connected to Switching Power Supply modulation chip FB pins, adjusts duty cycle according to feedback signal, and then adjust
Save output voltage.
Optocoupler protection circuit 3 is main to be play a part of to protect optocoupler, is subject to lightning induction outside, is raised earth potential, electricity
Stream is less than 0.7V from 2 feet of adjustable current source N1 to 3 feet through VD1 to voltage output end Uout, the first optocoupler E1 directions voltage VR,
The first optocoupler E1 is effectively protected, avoids the Switching Power Supply failure caused by optocoupler damages.
The scope of protection of the utility model includes but not limited to embodiment of above, and the scope of protection of the utility model is to weigh
Subject to sharp claim, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement are each fallen within
The scope of protection of the utility model.
Claims (5)
1. acquisition terminal power supply feeds back protection circuit, including reference circuit（4）, zero pole point circuit（5）, TL431 and optocoupler composition
Controllable current backfeed loop（2）And backfeed loop（1）, described optocoupler composition controllable current backfeed loop（2）It is defeated including voltage
Outlet（Uout）And adjustable current source（N1）, the reference circuit（4）, zero pole point circuit（5）Detect voltage output end
（Uout）Voltage, according to the difference of voltage, feed back to adjustable current source（N1）, finally from backfeed loop（1）Output, its feature
It is, further includes and protect circuit for the optocoupler of water conservancy diversion pilot（3）, described optocoupler protection circuit（3）For the first diode
（VD1）, the first diode（VD1）Anode and voltage output end（Uout）Connection, the first diode（VD1）Cathode with it is adjustable
Current source（N1）Connection.
2. acquisition terminal power supply according to claim 1 feeds back protection circuit, it is characterised in that the reference circuit
（4）Including second resistance（R2）, the 4th resistance（R4）With the 6th resistance（R6）, the 6th resistance（R6）One end ground connection,
6th resistance（R6）The other end connect the 4th resistance（R4）One end, the 4th resistance（R4）The other end connection second
Resistance（R2）One end, the second resistance（R2）The other end connect the first diode（VD1）Anode.
3. acquisition terminal power supply according to claim 2 feeds back protection circuit, it is characterised in that the zero pole point circuit
（5）Including the 5th resistance（R5）, the first capacitance（C1）With the second capacitance（C2）, the 5th resistance（R5）One end connection first
Diode（VD1）Cathode, the 5th resistance（R5）The other end connects the first capacitance（C1）One end, described first electricity
Hold（C1）The other end connect the 4th resistance（R4）One end, second capacitance（C2）One end connects the first diode
（VD1）Cathode, the other end connect the 4th resistance（R4）One end.
4. acquisition terminal power supply according to claim 3 feeds back protection circuit, it is characterised in that the TL431 and light
Coupling composition controllable current backfeed loop includes first resistor（R1）, 3rd resistor（R3）, the first optocoupler（E1）, adjustable current source
（N1）With the second diode（VD2）, the adjustable current source（N1）One end ground connection, adjustable current source（N1）The other end connect
Connect 3rd resistor（R3）One end, the 3rd resistor（R3）The other end connection first resistor（R1）One end, it is described
First resistor（R1）The other end connects the first diode（VD1）Anode, second diode（VD2）It is connected in parallel on adjustable electric
Stream source（N1）Both ends, first optocoupler（E1）It is connected in parallel on 3rd resistor（R3）Both ends.
5. acquisition terminal power supply according to claim 4 feeds back protection circuit, it is characterised in that the backfeed loop
（1）Chip FB, Switching Power Supply modulation chip FB and the first optocoupler are modulated including Switching Power Supply（E1）Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721257570.4U CN207321109U (en) | 2017-09-28 | 2017-09-28 | Acquisition terminal power supply feeds back protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721257570.4U CN207321109U (en) | 2017-09-28 | 2017-09-28 | Acquisition terminal power supply feeds back protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207321109U true CN207321109U (en) | 2018-05-04 |
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ID=62428309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721257570.4U Active CN207321109U (en) | 2017-09-28 | 2017-09-28 | Acquisition terminal power supply feeds back protection circuit |
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| CN (1) | CN207321109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659999A (en) * | 2019-01-07 | 2019-04-19 | 浙江禾川科技股份有限公司 | A kind of charging circuit of super capacitor |
-
2017
- 2017-09-28 CN CN201721257570.4U patent/CN207321109U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659999A (en) * | 2019-01-07 | 2019-04-19 | 浙江禾川科技股份有限公司 | A kind of charging circuit of super capacitor |
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