CN206060522U - A kind of anti-back flow circuit - Google Patents
A kind of anti-back flow circuit Download PDFInfo
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- CN206060522U CN206060522U CN201621132206.0U CN201621132206U CN206060522U CN 206060522 U CN206060522 U CN 206060522U CN 201621132206 U CN201621132206 U CN 201621132206U CN 206060522 U CN206060522 U CN 206060522U
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Abstract
This utility model is related to power circuit field, particularly a kind of anti-back flow circuit.Including detection circuit, comparison circuit and gate-controlled switch；The detection circuit is arranged between source current and circuit for power conversion, and two inputs of the comparison circuit are connected to two terminations of the detection circuit；The control end of the output connection gate-controlled switch of the comparison circuit；Described gate-controlled switch one end is connected with the outfan of anti-back flow circuit, other end ground connection.Sense of current on the anti-back flow circuit anti-back flow circuit for voltage analysis instrument voltage module that this utility model is provided mainly detection circuit, electric current forward direction flow through, and anti-back flow circuit does not produce any action.After upper electric current is reverse, the electric current for pouring in down a chimney is discharged into into ground in the effect conducting of transport and placing device device, so as to effectively prevent power modular converter from circuit is damaged when there is reverse irrigated current.
Description
Technical field
This utility model is related to power supply test field, particularly a kind of anti-back flow circuit.
Background technology
Generally, when the test related to DC source is carried out, engineer must collect and configure multiple stage instrument, could be complete
Into direct current supply and measuring task.When these complex tasks are performed, multiple stage test instrunment may be connected to simultaneously, so as to increase
The risk of error；For this purpose, engineer may select the automatic test complicated more than manual test, although automatic test task
Manual errors can be reduced, but the research and development engineer write with debugging routine to having worked overloadingly further increases work
Amount.And the appearance of DC source analyser avoids engineer using the debugging that complexity is carried out before multiple devices and test.Electricity
Electric current of the source analyser by the measurable inflow DUT of its built-in electric current kinetic measurement ability, without such as current probe
With this kind of sensor of diverter；, without the need for exploitation control and process of measurement, institute is functional and measures all integrated for DC source analyser
In same equipment, without PC, driver and software, more than 90% is reduced equivalent to the workload related to setting；
Direct current supply and measurement test assignment that user then can be just completed with 2 day time using independent test equipment, using unidirectional current
Source analyser just be able to can be completed in 5 minutes.And it is usual, circuit tester module, oscillograph mould are integrated with DC source analyser
There is module, data recordin module and multiple DC power suppliers in block, random waveform, wherein, it is multiple with different output works
The DC power supplier of rate is undoubtedly one of most crucial device of power analysis instrument, and in some cases, in power module
Circuit for power conversion occurs the situation that electric current pours in down a chimney, and serious electric current pours in down a chimney can cause device failure.
Utility model content
Goal of the invention of the present utility model is the power conversion electricity for each power module in DC source analyser
Road occurs the situation that electric current pours in down a chimney, there is provided, when electric current pours in down a chimney, the power module processed to reverse irrigated current is anti-down for one kind
Fill circuit.
To achieve these goals, the technical solution adopted in the utility model is：
A kind of anti-back flow circuit, including detection circuit, comparison circuit and gate-controlled switch；The detection circuit is arranged on source
Between power supply and circuit for power conversion, two inputs of the comparison circuit are connected to two ends of the detection circuit
Head；The control end of the output connection gate-controlled switch of the comparison circuit；Described gate-controlled switch one end and anti-back flow circuit
Outfan connects, other end ground connection.
Specifically, the detection circuit includes detection resistance；The comparison circuit includes transport and placing device
The first end of the detection resistance is connected with power input；Second end of the detection resistance pass through and connect
One inductance, the second inductance are connected with circuit for power conversion；
First input of first resistor, second resistance and transport and placing device of the second end of the detection resistance by being sequentially connected in series
End connection；The first end of the detection resistance is connected with the second input of transport and placing device by 3rd resistor.
The outfan of the transport and placing device is connected with the control end of the 9th gate-controlled switch by the 4th resistance；
The source electrode of the 9th gate-controlled switch by the 5th resistance simultaneously with the second end of detection resistance and and connect first
Inductance, the second inductance connection.
The drain electrode of the 9th gate-controlled switch passes through the 6th resistance eutral grounding；The first end of the detection resistance also passes through a diode
And concatenation the 7th resistance, the 8th resistance, the 9th resistance eutral grounding.
The first input end of transport and placing device is also by the first electric capacity for being sequentially connected in series, the second electric capacity, the tenth resistance and the 9th can
The source electrode connection of control switch；Second electric capacity and the tenth resistance of concatenation also with the 11st resistance and connects.
In sum, as a result of above-mentioned technical proposal, the beneficial effects of the utility model are：
The anti-back flow circuit anti-back flow circuit for voltage analysis instrument voltage module that this utility model is provided mainly is examined
Sense of current on detection circuit is surveyed, electric current forward direction flows through, and anti-back flow circuit does not produce any action.After upper electric current is reverse,
The electric current for pouring in down a chimney is discharged into into ground in the effect conducting of transport and placing device device, so as to effectively prevent power modular converter from occurring pouring in down a chimney electricity
Circuit is damaged during stream.
Description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is this utility model specific embodiment circuit diagram.
Specific embodiment
Below in conjunction with the accompanying drawings, this utility model is described in detail.
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain this
Utility model, is not used to limit this utility model.
Embodiment 1：As shown in figure 1, the present embodiment provides a kind of anti-back flow circuit, including detection circuit 1, comparison circuit 2
And gate-controlled switch 3；The detection circuit 1 is arranged between source current Vss and circuit for power conversion, the comparison circuit 2
Two inputs are connected to two terminations of the detection circuit 1；The output connection of the comparison circuit 2 is described controllable to open
Close 3 control end；3 one end of the gate-controlled switch is connected with the outfan of anti-back flow circuit, other end ground connection.
Embodiment 2：As shown in Fig. 2 in the present embodiment, the detection circuit includes detection resistance；The comparison circuit bag
Include transport and placing device；
The first end of detection resistance R266 is connected with power input；Second end of detection resistance R266 passes through
And it is the first gate-controlled switch in the first inductance L11, the second inductance L12 and the control circuit for connecing, the 3rd gate-controlled switch, the 5th controllable
Switch, the connection of the 7th gate-controlled switch；
Second end of detection resistance R266 passes through first resistor R268, second resistance R271 and the amplifier being sequentially connected in series
The first input end connection of device；The first end of detection resistance R66 is input into the second of transport and placing device by 3rd resistor R273
End connection.
The outfan of the transport and placing device is connected with the control end of the 9th gate-controlled switch Q20 by the 4th resistance R272；
The source electrode of the 9th gate-controlled switch Q20 by the 5th resistance R269 simultaneously with the second end of detection resistance R226 and
And the first inductance L11, the second inductance L12 connection for connecing.
The drain electrode of the 9th gate-controlled switch Q20 is grounded by the 6th resistance R274；The first end of detection resistance R266 is also
By the 7th resistance R276 of a diode D47 and concatenation, the 8th resistance R277, the 9th resistance R278 ground connection.
The first input end of transport and placing device U34 is also by the first electric capacity C198 for being sequentially connected in series, the second electric capacity C199, the tenth electric
Resistance R270 is connected with the source electrode of the 9th gate-controlled switch Q20；The second electric capacity C199 and the tenth resistance R270 of concatenation is also with the 11st
Resistance R267 simultaneously connects.
Anti-back flow circuit mainly detects sense of current in detection resistance R266, and electric current forward direction flows through, anti-back flow circuit
Any action is not produced.After on R266, electric current is reverse, the electric current for pouring in down a chimney is discharged in transport and placing device device U34 effect conducting Q20
Ground.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model
Protection domain within.
Claims (2)
1. a kind of anti-back flow circuit, it is characterised in that including detection circuit, comparison circuit and gate-controlled switch；The detection electricity
Road is arranged between source current and circuit for power conversion, and two inputs of the comparison circuit are connected to the detection electricity
Two terminations on road；The control end of the output connection gate-controlled switch of the comparison circuit；Described gate-controlled switch one end with it is anti-
The outfan connection of back flow circuit, other end ground connection.
2. anti-back flow circuit as claimed in claim 1, it is characterised in that the detection circuit includes detection resistance；The ratio
Include transport and placing device compared with circuit
The first end of the detection resistance is connected with power input；Second end of the detection resistance pass through first resistor and and
The first inductance for connecing, the second inductance are connected with circuit for power conversion；Second end of the detection resistance by be sequentially connected in series the
One resistance, second resistance, 3rd resistor are connected with the first input end of the transport and placing device；The first end of the detection resistance passes through
4th resistance is connected with the second input of transport and placing device；
The outfan of the transport and placing device is connected with the control end of the 9th gate-controlled switch by the 5th resistance；
The source electrode of the 9th gate-controlled switch passes through the 6th resistance and and the first inductance, the second inductance and each control circuit for connecing
In gate-controlled switch connection；The drain electrode of the 9th gate-controlled switch passes through the 7th resistance eutral grounding；
The first end of the detection resistance is also by the 8th resistance of a diode and concatenation, the 9th resistance, the tenth resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621132206.0U CN206060522U (en) | 2016-10-18 | 2016-10-18 | A kind of anti-back flow circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621132206.0U CN206060522U (en) | 2016-10-18 | 2016-10-18 | A kind of anti-back flow circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206060522U true CN206060522U (en) | 2017-03-29 |
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ID=58363921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621132206.0U Active CN206060522U (en) | 2016-10-18 | 2016-10-18 | A kind of anti-back flow circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206060522U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533142A (en) * | 2016-10-18 | 2017-03-22 | 成都前锋电子仪器有限责任公司 | Anti-backflow circuit |
-
2016
- 2016-10-18 CN CN201621132206.0U patent/CN206060522U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533142A (en) * | 2016-10-18 | 2017-03-22 | 成都前锋电子仪器有限责任公司 | Anti-backflow circuit |
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