CN208939556U - A kind of pressure limiting circuit - Google Patents
A kind of pressure limiting circuit Download PDFInfo
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- CN208939556U CN208939556U CN201821533741.6U CN201821533741U CN208939556U CN 208939556 U CN208939556 U CN 208939556U CN 201821533741 U CN201821533741 U CN 201821533741U CN 208939556 U CN208939556 U CN 208939556U
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Abstract
The utility model relates to a kind of pressure limiting circuit, including voltage detecting circuit, voltage detecting circuit is connected with reference voltage circuit, and voltage detecting circuit is also connected with the switching circuit of control power supply output；Switching circuit includes the field-effect tube for controlling power supply output, and switching circuit further includes the dual channel type field-effect tube for controlling the work of field-effect pipe, and dual channel type field-effect tube is connect with voltage detecting circuit；Pass through voltage detecting circuit real-time detection supply voltage; dual channel type field-effect tube cut-off when supply voltage is more than voltage rating in switching circuit; the field-effect tube connecting with dual channel type field-effect tube is also switched off simultaneously, power supply is without output; to realize voltage-limiting protection; otherwise it is then connected when supply voltage is restored in voltage rating, power supply has output；Realize that circuit power consumption is low, calorific value is small.
Description
Technical field
The utility model relates to circuit protection technical fields, more specifically to a kind of pressure limiting circuit.
Background technique
As people's lives level is continuously improved, demand of the people to electronic product constantly expands, existing pressure limiting electricity
Road mostly uses greatly divider resistance to carry out pressure limiting, and there is circuit loss height, calorific value is big.
Utility model content
The technical problem to be solved by the present invention is to, in view of the above drawbacks of the prior art, provide it is a kind of low in energy consumption,
The small pressure limiting circuit of calorific value.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of pressure limiting circuit, including voltage detecting circuit are constructed, the voltage detecting circuit is connected with reference voltage circuit,
The voltage detecting circuit is also connected with the switching circuit of control power supply output；The switching circuit includes that the control power supply is defeated
Field-effect tube out, the switching circuit further includes the dual channel type field-effect tube for controlling the field-effect tube work, described double
Channel-type field-effect tube is connect with the voltage detecting circuit.
Pressure limiting circuit described in the utility model, wherein the voltage detecting circuit includes dual operational amplifier, described double
2 pins of operational amplifier are connected with the first, second resistance, and the other end of the first resistor and the anode of power supply connect, institute
The other end ground connection of second resistance is stated, 2 pins of the dual operational amplifier are also connected with first capacitor, the first capacitor
Other end ground connection；1 pin of the dual operational amplifier is also connected with third, the 4th resistance, the other end of the 3rd resistor
It is connect with 5 pins of the dual channel type field-effect tube, the other end of the 4th resistance is connect with the anode of the power supply；
5 pins of the dual operational amplifier are also connected with the five, the 6th resistance, the other end of the 5th resistance and institute
The anode connection of power supply, the other end ground connection of the 6th resistance are stated, 5 pins of the dual operational amplifier are also connected with second
Capacitor, the other end ground connection of second capacitor；7 pins of the dual operational amplifier are also connected with the seven, the 8th resistance, institute
The other end for stating the 7th resistance is connect with 2 pins of the dual channel type field-effect tube, the other end of the 8th resistance and institute
State the anode connection of power supply；
8 pins of the dual operational amplifier are connect with the anode of the power supply, 4 pins are grounded.
Pressure limiting circuit described in the utility model, wherein the reference voltage circuit includes controllable accurate source of stable pressure, described
The reference pole of the plus earth of controllable accurate source of stable pressure, the controllable accurate source of stable pressure is connect with cathode, and the controllable accurate is steady
The cathode of potential source is also connected with the 9th resistance, and the other end of the 9th resistance is connect with the anode of the power supply, described controllable
The reference pole of precision voltage source is also connected with third capacitor, the other end ground connection of the third capacitor；The controllable accurate pressure stabilizing
The reference pole in source, which also connects, is connected as the dual operational amplifier offer reference voltage with 3,6 pins of the dual operational amplifier.
Pressure limiting circuit described in the utility model, wherein the grid of the field-effect tube is also connected with the ten, the 11 electricity
Resistance, the other end of the tenth resistance connect with 6 pins of the dual channel type field-effect tube, the eleventh resistor it is another
End is connect with the source electrode of the field-effect tube, and the source electrode of the field-effect tube is also connect with the anode of the power supply, the field effect
Should pipe drain electrode be the power supply cathode output end.
The utility model has the beneficial effects that: working as supply voltage by voltage detecting circuit real-time detection supply voltage
Dual channel type field-effect tube cut-off when more than voltage rating in switching circuit, the field-effect being connect with dual channel type field-effect tube
Pipe is also switched off simultaneously, power supply is without output, on the contrary then to lead when supply voltage is restored in voltage rating to realize voltage-limiting protection
Logical, power supply has output；Realize that circuit power consumption is low, calorific value is small.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below in conjunction with attached drawing and reality
Applying example, the utility model is described in further detail, and the accompanying drawings in the following description is only section Example of the invention, for this
For the those of ordinary skill of field, without creative efforts, it is attached to can also be obtained according to these attached drawings other
Figure:
Fig. 1 is the circuit diagram of the pressure limiting circuit of the utility model preferred embodiment；
Fig. 2 is the circuit diagram of the reference voltage circuit of the utility model preferred embodiment.
Specific embodiment
It is practical below in conjunction with this in order to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Technical solution in new embodiment carries out clear, complete description, it is clear that described embodiment is the portion of the utility model
Point embodiment, rather than whole embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not paying creation
Property labour under the premise of every other embodiment obtained, belong to the protection scope of the utility model.
The pressure limiting circuit of the utility model preferred embodiment is as shown in Figure 1 while referring to Fig.2, including voltage detecting circuit
1, voltage detecting circuit 1 is connected with reference voltage circuit 2, and voltage detecting circuit 1 is also connected with the switch electricity of control power supply output
Road 3；Switching circuit 3 includes the field-effect tube U52 of control power supply output, and switching circuit 3 further includes control field-effect tube U52 work
Dual channel type field-effect tube Q41, dual channel type field-effect tube Q41 connect with voltage detecting circuit 1；Pass through voltage detecting circuit
1 real-time detection supply voltage, the dual channel type field-effect tube Q41 when supply voltage is more than voltage rating in switching circuit 3 are cut
Only, be also switched off simultaneously with the dual channel type field-effect tube Q41 field-effect tube U52 connecting, power supply is without output, to realize that pressure limiting is protected
Shield, on the contrary it is then connected when supply voltage is restored in voltage rating, and power supply has output；Realize that circuit power consumption is low, calorific value is small.
As shown in Figure 1, voltage detecting circuit 1 includes dual operational amplifier 0402,2 pins of dual operational amplifier 0402
It is connected with the first, second resistance R34 4, R140, the other end of first resistor R344 and the anode of power supply connect, second resistance
The other end of R140 is grounded, and 2 pins of dual operational amplifier 0402 are also connected with first capacitor C373, and first capacitor C373's is another
One end ground connection；1 pin of dual operational amplifier 0402 is also connected with third, the 4th resistance R332, R386,3rd resistor R332
The other end connect with 5 pins of dual channel type field-effect tube Q41, the anode of the other end of the 4th resistance R386 and power supply is even
It connects；
5 pins of dual operational amplifier are also connected with the five, the 6th resistance R388, R396, and the 5th resistance R388's is another
End is connect with the anode of power supply, and the other end of the 6th resistance R396 is grounded, and 5 pins of dual operational amplifier 0402 are also connected with the
The other end of two capacitor C374, the second capacitor C374 is grounded；7 pins of dual operational amplifier are also connected with the seven, the 8th resistance
The other end of R331, R382, the 7th resistance R331 are connect with 2 pins of dual channel type field-effect tube Q41, the 8th resistance R382's
The anode of the other end and power supply connects；
8 pins and the anode connection of power supply, 4 pins of dual operational amplifier 0402 are grounded；Using dual operational amplifier
0402 detection voltage, low in energy consumption, precision is high.
As shown in Fig. 2, reference voltage circuit 2 includes controllable accurate source of stable pressure Q48, the anode of controllable accurate source of stable pressure Q48
Ground connection, the reference pole of controllable accurate source of stable pressure Q48 are connect with cathode, and the cathode of controllable accurate source of stable pressure Q48 is also connected with the 9th
The other end of resistance R600, the 9th resistance R600 and the anode of power supply connect, and the reference pole of controllable accurate voltage source Q48 is also connected with
There are third capacitor C372, the other end ground connection of third capacitor C372；The reference pole also Lian Yushuan operation of controllable accurate source of stable pressure Q48
3, the 6 pins connection of amplifier 0402 provides reference voltage for dual operational amplifier 0402；Using controllable accurate source of stable pressure Q48
Reference voltage is provided for dual operational amplifier 0402；Realize that precision is high.
As shown in Figure 1, the grid of field-effect tube U52 is also connected with the ten, the 11 resistance R424, R422, the tenth resistance
The other end of R424 is connect with 6 pins of dual channel type field-effect tube 0402, the other end of eleventh resistor R422 and field-effect
The source electrode of pipe U52 connects, and the source electrode of field-effect tube U52 is also connect with the anode of power supply, and the drain electrode of field-effect tube U52 is power supply
Cathode output end；Realize that work efficiency is high.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (4)
1. a kind of pressure limiting circuit, including voltage detecting circuit；It is characterized in that, the voltage detecting circuit is connected with reference voltage
Circuit, the voltage detecting circuit are also connected with the switching circuit of control power supply output；The switching circuit includes described in control
The field-effect tube of power supply output, the switching circuit further include the dual channel type field-effect tube for controlling the field-effect tube work,
The dual channel type field-effect tube is connect with the voltage detecting circuit.
2. pressure limiting circuit according to claim 1, which is characterized in that the voltage detecting circuit includes double operation amplifiers
Device, 2 pins of the dual operational amplifier are connected with the first, second resistance, and the other end and power supply of the first resistor are just
Pole connection, the other end ground connection of the second resistance, 2 pins of the dual operational amplifier are also connected with first capacitor, described
The other end of first capacitor is grounded；1 pin of the dual operational amplifier is also connected with third, the 4th resistance, the third electricity
The other end of resistance is connect with 5 pins of the dual channel type field-effect tube, the other end and the power supply of the 4th resistance
Anode connection；
5 pins of the dual operational amplifier are also connected with the five, the 6th resistance, the other end and the electricity of the 5th resistance
The anode connection in source, the other end ground connection of the 6th resistance, 5 pins of the dual operational amplifier are also connected with the second electricity
Hold, the other end ground connection of second capacitor；7 pins of the dual operational amplifier are also connected with the seven, the 8th resistance, described
The other end of 7th resistance is connect with 2 pins of the dual channel type field-effect tube, the other end of the 8th resistance with it is described
The anode connection of power supply；
8 pins of the dual operational amplifier are connect with the anode of the power supply, 4 pins are grounded.
3. pressure limiting circuit according to claim 2, which is characterized in that the reference voltage circuit includes controllable accurate pressure stabilizing
The reference pole in source, the plus earth of the controllable accurate source of stable pressure, the controllable accurate source of stable pressure is connect with cathode, described controllable
The cathode of precision voltage regulator is also connected with the 9th resistance, and the other end of the 9th resistance is connect with the anode of the power supply, institute
The reference pole for stating controllable accurate voltage source is also connected with third capacitor, the other end ground connection of the third capacitor；The controllable essence
The reference pole of close source of stable pressure, which also connects, is connected as the dual operational amplifier offer benchmark with 3,6 pins of the dual operational amplifier
Voltage.
4. pressure limiting circuit according to claim 1, which is characterized in that the grid of the field-effect tube is also connected with the tenth,
The other end of 11 resistance, the tenth resistance is connect with 6 pins of the dual channel type field-effect tube, the eleventh resistor
The other end connect with the source electrode of the field-effect tube, the source electrode of the field-effect tube also with the power supply anode connect, institute
The drain electrode for stating field-effect tube is the cathode output end of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821533741.6U CN208939556U (en) | 2018-09-19 | 2018-09-19 | A kind of pressure limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821533741.6U CN208939556U (en) | 2018-09-19 | 2018-09-19 | A kind of pressure limiting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208939556U true CN208939556U (en) | 2019-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821533741.6U Active CN208939556U (en) | 2018-09-19 | 2018-09-19 | A kind of pressure limiting circuit |
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| CN (1) | CN208939556U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515013A (en) * | 2019-07-25 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of dielectric strength test method, system and server power supply |
-
2018
- 2018-09-19 CN CN201821533741.6U patent/CN208939556U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110515013A (en) * | 2019-07-25 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of dielectric strength test method, system and server power supply |
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| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee after: Shenzhen smart Micro Intelligent Technology Co., Ltd Address before: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee before: JWIPC TECHNOLOGY DEVELOPMENT Ltd. |
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| CP01 | Change in the name or title of a patent holder |