CN109188058A - A kind of practical input power down quick detection circuit - Google Patents
A kind of practical input power down quick detection circuit Download PDFInfo
- Publication number
- CN109188058A CN109188058A CN201811056313.3A CN201811056313A CN109188058A CN 109188058 A CN109188058 A CN 109188058A CN 201811056313 A CN201811056313 A CN 201811056313A CN 109188058 A CN109188058 A CN 109188058A
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- circuit
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- circuit connection
- transformer secondary
- triode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/155—Indicating the presence of voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of practical input power down quick detection circuits, including transformer secondary output winding module, voltage comparison module and signal output module, the transformer secondary output winding sampling rectification module is made of transformer secondary coil T, diode D1 and capacitor C1, wherein, the pin 8 of transformer secondary coil T is by circuit connection in the diode D1, the circuit interface of diode D1 is by circuit connection in the capacitor C1, and capacitor C1 is by circuit connection on 7 circuit interface of pin of the transformer secondary coil T；This practical input power down quick detection circuit, by directly being sampled from the secondary windings of transformer, by compared with the voltage of benchmark device, so as to accurately judge input voltage, route is simple, quickly, accurately, the material and design cost of route can be substantially reduced.
Description
Technical field
The present invention relates to communication power supply technical field, specially a kind of practical input power down quick detection circuit.
Background technique
Now widely used input voltage detection of power loss technology is alternating current by being depressured filtering after the rectification of exchange side, is passed through
Monolithic machine testing or amplifier are transferred to the detection circuit that secondary output reports signal by optocoupler more again.This detection circuit by
High pressure decompression, and rely on the LMDS Light Coupled Device with single-chip microcontroller or comparator and bridging preliminary survey grade, at high cost, bridging line away from
From it is remote, vulnerable to interfering, be unfavorable for PCB layout designs.
Summary of the invention
The purpose of the present invention is to provide a kind of practical input power down quick detection circuits, pass through the secondary from transformer
It is directly sampled on winding, by compared with the voltage of benchmark device, so as to accurately judge input voltage, route
Simply, quickly, accurately, the material and design cost that can substantially reduce route, solve the problems of the prior art.
To achieve the above object, the invention provides the following technical scheme: a kind of practical input power down quick detection circuit,
Including transformer secondary output winding module, voltage comparison module and signal output module, the transformer secondary output winding sampling rectification
Module is made of transformer secondary coil T, diode D1 and capacitor C1, wherein the pin 8 of transformer secondary coil T passes through electricity
Road is connected to the diode D1, and the circuit interface of diode D1 is logical in the capacitor C1, capacitor C1 by circuit connection
Oversampling circuit is connected on 7 circuit interface of pin of the transformer secondary coil T；The voltage comparison module is by series resistance
R1, R2, resistance R6, capacitor C2 and adjustable precision voltage-stablizer U1 composition, wherein resistance R6 is by circuit connection in the series electrical
On the circuit interface for hindering R1, R2, capacitor C2 by circuit connection on the circuit interface of the resistance R6, adjustable precision voltage-stablizer
The pin 1 of U1 is by circuit connection in the resistance R6；The signal output module is by series resistance R3, R4 and triode
Q1, wherein by circuit connection on the circuit interface of described resistance R3, R4, triode Q1's penetrates the base stage of triode Q1
By circuit connection on 7 circuit interface of pin of the transformer secondary coil T, the collector of triode Q1 passes through circuit for pole
It is connected to output interface VIN-DOWN.
Preferably, series resistance R1, R2, which also passes through circuit connection, triode Q2, and the base stage of triode Q2 passes through circuit
It is connected with resistance R5, resistance R5 is by circuit connection in the pin 2 of the adjustable precision voltage-stablizer U1, the collector of triode Q2
By circuit connection in series resistance R3, R4.
Preferably, also there is concatenated resistance R8 by circuit connection on the collector circuit interface of resistance R6 and triode Q2
With diode D2.
Preferably, the circuit interface of diode D1 also passes through circuit connection in the emitter base diode circuit interface of the triode Q2
On.
Compared with prior art, beneficial effects of the present invention are as follows:
This practical input power down quick detection circuit carries out transformer secondary coil T by diode D1, capacitor C1
After sampling and rectifying and wave-filtering, the voltage after sampling rectification is divided via series resistance R1, R2, resistance R6 and capacitor C2
Pressure is concatenated resistance R3, R4 and three poles after then the voltage after partial pressure is made comparisons and judged with adjustable precision voltage-stablizer U1
Pipe Q1 is by voltage output；Therefore based on above-mentioned, this circuit is accurately judged input voltage, due to route letter
It is single, quick, accurate, so as to substantially reduce the material and design cost of route.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
In figure: 1, transformer secondary output winding module；2, voltage comparison module；3, signal output module.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of practical input power down quick detection circuit, including transformer secondary output winding module 1, voltage
Comparison module 2 and signal output module 3；Transformer secondary output winding samples rectification module 1 by transformer secondary coil T, diode
D1 and capacitor C1 composition, wherein the pin 8 of transformer secondary coil T is by circuit connection in diode D1, the electricity of diode D1
Road interface is connected on the emitter base diode circuit interface of capacitor C1 and triode Q2 by circuit, capacitor C1 by circuit connection in
On 7 circuit interface of pin of transformer secondary coil T；Transformer secondary coil T is adopted by diode D1 and capacitor C1
Sample and rectifying and wave-filtering.
Voltage comparison module 2 is made of series resistance R1, R2, resistance R6, capacitor C2 and adjustable precision voltage-stablizer U1,
In, resistance R6 is by circuit connection on the circuit interface of series resistance R1, R2, and capacitor C2 is by circuit connection in resistance R6's
On circuit interface, the pin 1 of adjustable precision voltage-stablizer U1 is by circuit connection in resistance R6；Series resistance R1, R2 also passes through electricity
Road is connected with triode Q2, and the base stage of triode Q2 has a resistance R5 by circuit connection, and resistance R5 is by circuit connection in can
The pin 2 of accurate voltage-stablizer U1 is adjusted, the collector of triode Q2 is by circuit connection in series resistance R3, R4；Pass through series electrical
Resistance R1, R2, resistance R6 and capacitor C2 divide the voltage after sampling rectification, then by after partial pressure voltage and adjustable essence
Close voltage-stablizer U1 makes comparisons and judges.
Signal output module 3 is by series resistance R3, R4 and triode Q1, wherein the base stage of triode Q1 is connected by circuit
It is connected on the circuit interface of series resistance R3, R4, the emitter-base bandgap grading of triode Q1 passes through circuit connection drawing in transformer secondary coil T
On 7 circuit interface of foot, the collector of triode Q1 is by circuit connection in output interface VIN-DOWN；Resistance R6 and triode Q2
Collector circuit interface on also have concatenated resistance R8 and diode D2 by circuit connection；Pass through resistance R8 and diode D2
The positive-feedback circuit of composition, avoids adjustable precision voltage-stablizer U1 input nonlinearities from causing the malfunction after overturning, and voltage is concatenated electricity
The signal output stage of R3, R4 and triode Q1 composition is hindered by voltage output.
Circuit theory: input powers on, and transformer secondary coil T generates square-wave voltage, rectifies and filters through diode D1, capacitor C1
It after involving partial pressure, gives adjustable precision voltage-stablizer U1 and is compared and judges, when being higher than reference itself voltage, adjustable precision is steady
Depressor U1 is connected Pin2 and exports low level, so that triode Q2Vbe is become negative pressure and is also switched on, and voltage is through Q2 transmitting collection to collector；
When triode Q1 conducting, Rce is made to be rendered as Low ESR, informs that late-class circuit input powers on；Conversely, when input power down, transformation
Device secondary coil T is generated without square-wave voltage, and the Pin2 of adjustable precision voltage-stablizer U1 will not be pulled low, and triode Q1 turns off its Rce
It is rendered as high impedance, informs that late-class circuit inputs power down.
In summary: this practical input power down quick detection circuit, by diode D1, capacitor C1 to transformer secondary output
After coil T carries out sampling and rectifying and wave-filtering, after being rectified via series resistance R1, R2, resistance R6 and capacitor C2 to sampling
Voltage is divided, and after then the voltage after partial pressure is made comparisons and judged with adjustable precision voltage-stablizer U1, is concatenated resistance
R3, R4 and triode Q1 are by voltage output；Therefore based on above-mentioned, this circuit is accurately sentenced to input voltage
It is disconnected, since route is simple, quick, accurate, so as to substantially reduce the material and design cost of route.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (4)
1. a kind of practical input power down quick detection circuit, including transformer secondary output winding module (1), voltage comparison module
(2) and signal output module (3), it is characterised in that: transformer secondary output winding sampling rectification module (1) is by transformer secondary output
Coil T, diode D1 and capacitor C1 composition, wherein the pin 8 of transformer secondary coil T is by circuit connection in described two
The circuit interface of pole pipe D1, diode D1 are by circuit connection in the capacitor C1, and capacitor C1 is by circuit connection in described
On 7 circuit interface of pin of transformer secondary coil T；The voltage comparison module (2) is by series resistance R1, R2, resistance R6, electricity
Hold C2 and adjustable precision voltage-stablizer U1 composition, wherein circuit of the resistance R6 by circuit connection in series resistance R1, R2 connects
On mouth, for capacitor C2 by circuit connection on the circuit interface of the resistance R6, the pin 1 of adjustable precision voltage-stablizer U1 passes through electricity
Road is connected to the resistance R6；The signal output module (3) is made of series resistance R3, R4 and triode Q1, wherein three
For the base stage of pole pipe Q1 by circuit connection on the circuit interface of described resistance R3, R4, the emitter-base bandgap grading of triode Q1 passes through circuit
It is connected on 7 circuit interface of pin of the transformer secondary coil T, the collector of triode Q1 is by circuit connection in output
Interface VIN-DOWN.
2. the practical input power down quick detection circuit of one kind according to claim 1, it is characterised in that: series resistance
R1, R2, which also pass through circuit connection, triode Q2, and the base stage of triode Q2 has resistance R5, resistance R5 to pass through by circuit connection
Circuit connection is in the pin 2 of the adjustable precision voltage-stablizer U1, and the collector of triode Q2 is by circuit connection in the string
Join resistance R3, R4.
3. the practical input power down quick detection circuit of one kind according to claim 1, it is characterised in that: resistance R6 and three
Also there are concatenated resistance R8 and diode D2 by circuit connection on the collector circuit interface of pole pipe Q2.
4. the practical input power down quick detection circuit of one kind according to claim 1, it is characterised in that: diode D1's
Circuit interface also passes through circuit connection on the emitter base diode circuit interface of the triode Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811056313.3A CN109188058A (en) | 2018-09-11 | 2018-09-11 | A kind of practical input power down quick detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811056313.3A CN109188058A (en) | 2018-09-11 | 2018-09-11 | A kind of practical input power down quick detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109188058A true CN109188058A (en) | 2019-01-11 |
Family
ID=64910175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811056313.3A Pending CN109188058A (en) | 2018-09-11 | 2018-09-11 | A kind of practical input power down quick detection circuit |
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| CN (1) | CN109188058A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201418039Y (en) * | 2009-05-13 | 2010-03-03 | 深圳市麦格米特电气技术有限公司 | AC dump sampling circuit |
| CN204065756U (en) * | 2014-09-11 | 2014-12-31 | 国家电网公司 | A kind of SCM Based energy-conservation power-off protecting circuit |
| CN108429934A (en) * | 2018-05-23 | 2018-08-21 | 郑州天点科技有限公司 | A kind of router with anti-lost Electricity Functional |
| CN209417138U (en) * | 2018-09-11 | 2019-09-20 | 北京迪赛奇正科技有限公司 | A kind of practical input power down quick detection circuit |
-
2018
- 2018-09-11 CN CN201811056313.3A patent/CN109188058A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201418039Y (en) * | 2009-05-13 | 2010-03-03 | 深圳市麦格米特电气技术有限公司 | AC dump sampling circuit |
| CN204065756U (en) * | 2014-09-11 | 2014-12-31 | 国家电网公司 | A kind of SCM Based energy-conservation power-off protecting circuit |
| CN108429934A (en) * | 2018-05-23 | 2018-08-21 | 郑州天点科技有限公司 | A kind of router with anti-lost Electricity Functional |
| CN209417138U (en) * | 2018-09-11 | 2019-09-20 | 北京迪赛奇正科技有限公司 | A kind of practical input power down quick detection circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
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