CN208421671U - A kind of isolation control circuit - Google Patents
A kind of isolation control circuit Download PDFInfo
- Publication number
- CN208421671U CN208421671U CN201820976701.2U CN201820976701U CN208421671U CN 208421671 U CN208421671 U CN 208421671U CN 201820976701 U CN201820976701 U CN 201820976701U CN 208421671 U CN208421671 U CN 208421671U
- Authority
- CN
- China
- Prior art keywords
- module
- resistance
- switch
- voltage
- input terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000002955 isolation Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 19
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model discloses a kind of isolation control circuits, including voltage detection module, isolation control module and switch module.Voltage detection module is compared for acquiring input voltage signal with preset voltage value, and the voltage signal that can be isolated control module identification is generated in its output end；Isolation control module is used for the voltage signal that transmits voltage detection module and is converted to current signal, and the current signal is sent to the input terminal of switch module, while and guaranteeing being isolated for voltage detection module and switch module；Switch module is used to be isolated the current signal that control module transmits and is converted to switching signal, and controls whether its output end is exported.The utility model do not realize in the circuit with reference to ground altogether primary circuit voltage reach after preset voltage value it is secondary while while circuit just start to start work, the working sequence that isolation circuit may be implemented controls.
Description
Technical field
The utility model relates to field of switch power, in particular to for detecting the voltage value of input signal in Switching Power Supply
It realizes not altogether with reference to the isolation control circuit on ground.
Background technique
Common isolation controller part is relay in Switching Power Supply at present.Its main working principle are as follows: relay inspection
Survey primary side electric current, by primary current generate magnetic field, using the magnetic field of generation come attracting electric relay mechanical switch come realize every
It is controlled from control.Because containing mechanical switch inside relay, it is attracted and disconnects every time the mechanical damage that can all cause elastic slice, it is right
Device service life is affected.Secondly, mechanical switch present in its structure has the sound during actuation and disconnection,
And elastic slice generates biggish shaking interference signal in being attracted disconnection process, is not suitable in the accurate circuit of detection.Moreover,
The volume of general relay is all larger, and the product of small size is not available the device yet.
Therefore, it is necessary to be improved to the prior art, needs to design the new circuit of one kind to realize and control control is isolated,
The circuit needs to meet small size, and detection accuracy is high, and the service life is long, and the features such as high pressure resistant is isolated.
Utility model content
In view of this, in order to solve the above-mentioned technical problem, the utility model provides a kind of isolation control control circuit, with solution
Certainly small size, high-precision, the isolation control problem of high isolation pressure resistance.
The purpose of this utility model is achieved through the following technical solutions:
A kind of isolation control circuit, including voltage detection module, isolation control module and switch module；Wherein, voltage is examined
The input terminal for surveying module is the input terminal of isolation control circuit, the output end connection isolation control module of voltage detection module
Input terminal, is isolated the input terminal of the output end connection switch module of control module, and the output end of switch module is that control is isolated
The output end of circuit；
Voltage detection module is compared for acquiring input voltage signal with preset voltage value, and is generated in its output end
The voltage signal of control module identification can be isolated；The voltage signal that isolation control module is used to transmit voltage detection module turns
It is changed to current signal, and the current signal is sent to the input terminal of switch module, while and guaranteeing voltage detection module and opening
Close the isolation of module；Switch module is used to be isolated the current signal that control module transmits and is converted to switching signal, and controls it
Whether output end is exported.
Preferably, voltage detection module includes controllable accurate source of stable pressure, comparator, first resistor, second resistance, third electricity
Resistance；Input terminal of the one end of first resistor as voltage detection module connects the first feeder ear, the other end connection of first resistor
The positive input terminal of the series connection point connection comparator of one end of second resistance, first resistor and second resistance；Second resistance it is another
One end is connect with the first reference；One end of 3rd resistor is connect with the first feeder ear, the other end of 3rd resistor and controllable essence
The cathode connection of the reference end, controllable accurate source of stable pressure of close source of stable pressure, this tie point connect the negative input end of comparator；Controllable essence
The anode of close source of stable pressure is connect with the first reference；Output end of the output end of comparator as voltage detection module.
Preferably as a kind of improvement project of above scheme, voltage detection module further includes third switching tube and the 7th
Resistance；One end of 7th resistance connects the first feeder ear, the drain electrode of the other end connection third switching tube of the 7th resistance, and third is opened
The source electrode for closing pipe is connected to the positive input terminal of comparator, and the grid of third switching tube is connected to the output end of comparator.
Preferably, isolation control module includes first switch tube, optocoupler, the 4th resistance and the 5th resistance；First switch tube
Input terminal of the grid as isolation control module, the drain electrode of the first open pipe connects the first feeder ear by the 4th resistance, first
The anode of the source electrode connection optocoupler primary side diode of switching tube, the cathode connection first of optocoupler primary side diode is with reference to ground, optocoupler
The collector of secondary side triode is connected to the second feeder ear by the 5th resistance, and the emitter of optical coupling secondary edges triode is as isolation
The output end of control module.
Preferably, switch module includes second switch, first capacitor and the 6th resistance；The grid conduct of second switch
The input terminal of switch module, the drain electrode of second switch connect the second feeder ear, the source electrode connection first capacitor of the second open pipe
Anode, output end of this connecting node as switch module；The cathode of first capacitor is connected to second with reference to ground, and the 6th resistance is simultaneously
The input terminal and second of switch module is associated in reference between ground.
Compared with prior art, the utility model has the following beneficial effects:
1, the utility model circuit is small in size, and voltage detecting precision is high, and isolation is high pressure resistant, generates without mechanical switch different
Loud and shaking interference；
2, the utility model circuit is simple, at low cost, easily designed；
Detailed description of the invention
Fig. 1 is the utility model principle block diagram；
Fig. 2 is the utility model first embodiment circuit diagram；
Fig. 3 is the utility model first embodiment voltage tester waveform diagram；
Fig. 4 is the utility model second embodiment circuit diagram；
Fig. 5 is the voltage tester waveform diagram of the utility model second embodiment.
Specific embodiment
Fig. 1 is the principles of the present invention block diagram, and voltage detection module is used for the input voltage signal of sampling switch power supply,
It is compared with preset reference voltage, the defeated of control module is extremely isolated in the output end output comparison signal of voltage detection module
Enter end；Isolation control module receives the comparison signal that voltage detection module transmits and is isolated, is converted to current signal, and will
The current signal is sent to the input terminal of switch module, and switch module receives the current signal that isolation control module transmits and progress
Current signal is converted to switching signal by conversion, and whether the output end of control switch module is exported.
With reference to the accompanying drawings and embodiments, the utility model is illustrated.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model.
First embodiment
If Fig. 2 is the utility model first embodiment circuit diagram, each modular circuit structure is as follows:
Voltage detection module, including TL431U1 (TL431 alternatively selects AZ431), comparator U2, resistance R1, resistance
R2, resistance R3；One end of resistance R1 connects the first feeder ear VCC1, and the other end of resistance R1 connects one end of resistance R2 and compares
The positive input terminal of device U2, the other end connection first of resistance R2 is with reference to ground；One end of resistance R3 connects the first feeder ear VCC1, electricity
Hinder the other end connection negative input end of comparator of R3, the reference end of the cathode of TL431U1, TL431U1, the anode of TL431U1
Connection first is with reference to ground, the output end connection isolation control module of comparator U2.
Control module, including switching tube Q1, optocoupler OP1, resistance R4, resistance R5 is isolated；The grid of switching tube Q1 connects ratio
Compared with the output end of device U2, the drain electrode of switching tube Q1 is connected by the source electrode of the first feeder ear of resistance R4 connection VCC1, switching tube Q1
The anode of optocoupler OP1 primary side diode, the cathode connection first of optocoupler OP1 primary side diode is with reference to ground, three pole of optocoupler OP1 pair side
The collector of pipe is connected to the second feeder ear VCC2, the emitter connection switch mould of optocoupler OP1 pair side triode by resistance R5
Block.
Switch module, including switching tube Q2, capacitor C1, resistance R6；The grid of switching tube Q2 connects three pole of optocoupler OP1 pair side
The emitter of pipe, the drain electrode of switching tube Q2 connect the second feeder ear VCC2, and the source electrode of switching tube Q2 passes through anode, the electricity of capacitor C1
The cathode for holding C1 is connected to second with reference to ground, and one end of resistance R6 connects the emitter of optocoupler OP1 pair side triode, resistance R6's
Other end connection second is with reference to ground.
The working principle of the present embodiment are as follows:
Resistance R1 and resistance R2 samples the voltage value of the first feeder ear VCC1, and the voltage signal that sampling partial pressure is obtained is defeated
Enter the positive input terminal to comparator U2, the cathode of TL431U1 is connected with its reference end, and the voltage value of TL413U1 output is as base
Quasi- comparison voltage is input to the negative input end of comparator U2.When the voltage value that sampling obtains the first feeder ear VCC1 reaches and is higher than
When preset voltage value, the output end output of comparator is high level, and switching tube Q1 conducting has electric current to flow through optocoupler OP1 primary side
Diode triggers optocoupler OP1 pair side triode ON, optocoupler OP1 conducting, and trigger switch pipe Q2 is connected, at this time the second feeder ear
VCC2, resistance R5, optocoupler OP1 pair side triode, resistance R6, second are with reference to ground forming circuit, the voltage of the second feeder ear VCC2
Trigger switch pipe Q2 is connected after being divided, and the second feeder ear VCC2, the pipe Q2 that opens the light, capacitor C1, is formed into a loop to the second reference, this
When the second feeder ear VCC2 voltage by conducting switching tube Q2 load on capacitor C1, be in the voltage of the anode of capacitor C1
Output voltage Vout；When sampling obtains the first feeder ear VCC1 voltage lower than preset voltage value, the output end of comparator U2
Output is low level, and switching tube Q1 cut-off, optocoupler OP1 is not turned on, since the drop-down effect of resistance R6 is so that switching tube Q2 ends,
The voltage of the second feeder ear VCC2 can not load on capacitor C1 in this case, and system output output voltage Vout is 0.
Fig. 3 is the voltage tester waveform of circuit each point in first embodiment.A point corresponds to the negative of comparator in Fig. 2 in figure
Input terminal controls electrical voltage point for isolation.From figure 3, it can be seen that when the first end feeder ear VCC1 voltage does not reach preset
When the voltage value of isolation control electrical voltage point, system output voltage Vout is not exported, even if the second feeder ear VCC2 has certain electricity
Pressure, but the first feeder ear VCC1 does not reach preset voltage value, output voltage Vout is always 0.When the first feeder ear
When VCC1 reaches and is higher than preset voltage value (the isolation control electrical voltage point A point i.e. in arrival figure), system output voltage Vout
Voltage instantaneous reaches high voltage, and can continually and steadily export.
The present embodiment applies in practical application, if it is 16.5V that the preset voltage of A point of Fig. 2 design, which is theoretical value, passes through
The obtained voltage of actual test is 16.9V, it can thus be appreciated that the detection voltage accuracy of the circuit is about 2.42%, in addition, is considered
Precision to the other factors such as test error, the circuit is higher.
Control module to be isolated in the present embodiment and uses light-coupled isolation scheme, isolation pressure resistance is the isolation stress levels of optocoupler,
It can reach the testing standard of 5000V, and shaking interference and abnormal sound do not occur when circuit work.Meet design requirement.
Second embodiment
As shown in figure 4, be the working principle diagram of second embodiment, compared with first embodiment, the difference is that: voltage
Detection module further includes resistance R7 and switching tube Q3, the voltage detecting return difference for the first feeder ear VCC1；One end of resistance R7
The first feeder ear VCC1 is connected, the drain electrode of the other end connection switch pipe Q3 of resistance R7, the source electrode of switching tube Q3, which is connected to, to be compared
The positive input terminal of device U2, the grid of switching tube Q3 are connected to the output end of comparator U2.
The present embodiment realizes that the working principle of circuit isolation control is identical with the first embodiment, and is not repeated.It needs to illustrate
, in the first embodiment, after the first feeder ear VCC1 voltage reaches preset voltage value, cause when there are other factors
When first feeder ear VCC1 generates voltage fluctuation, even if the voltage value of the first feeder ear VCC1 is lower than preset voltage value, system
Output voltage Vout can also generate biggish fluctuation.In order to avoid this phenomenon, in the present embodiment, when the first feeder ear
After the voltage of VCC1 reaches preset voltage value, switching tube Q3 conducting, the series circuit that resistance R7 and switching tube Q3 is constituted at this time
It is in parallel with resistance R1, the preset voltage value of script is dragged down, as shown in figure 5, B point is that new preset return difference controls electrical voltage point, the
One feeder ear VCC1 is lower than the voltage value at A point in the voltage value of B point.
Circuit in the present embodiment be not in occur at preset voltage value due to the first feeder ear VCC1 voltage compared with
The small fluctuation phenomenon unstable so as to cause output voltage Vout.
Fig. 5 is the test waveform figure of the present embodiment circuit each point voltage.As can be seen from the figure the circuit of the present embodiment is same
Sample has the function of first embodiment.And when the first feeder ear VCC1 is begun to decline, output voltage Vout is not reduced
Phenomenon, when the first feeder ear VCC1 voltage drops to B point (return difference control electrical voltage point), output voltage Vout is just gradually decreased.
According to practical application, when preset B point voltage theoretical value is 12V, the voltage measuring value surveyed out is 11.81V, and detection accuracy is about
It is 1.58%, it is contemplated that the factors such as test error, the precision of the circuit are higher.Meet design requirement.
Above are merely preferred embodiments of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For limitations of the present invention, the protection scope of the utility model should be defined by the scope defined by the claims..For
For those skilled in the art, without departing from the spirit and scope of the utility model, it can also make several
Improvements and modifications, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (5)
1. a kind of isolation control circuit, it is characterised in that: including voltage detection module, isolation control module and switch module；Its
In, the input terminal of voltage detection module is the input terminal of isolation control circuit, and the output end of voltage detection module connects isolation
The input terminal of control module, is isolated the input terminal of the output end connection switch module of control module, and the output end of switch module is
For the output end of isolation control circuit；
Voltage detection module is compared for acquiring input voltage signal with preset voltage value, and generating in its output end can quilt
The voltage signal of control module identification is isolated；The voltage signal that isolation control module is used to transmit voltage detection module is converted to
Current signal, and the current signal is sent to the input terminal of switch module, while and guaranteeing voltage detection module and switching molding
The isolation of block；Switch module is used to be isolated the current signal that control module transmits and is converted to switching signal, and controls its output
Whether end is exported.
2. isolation control circuit according to claim 1, it is characterised in that: voltage detection module includes controllable accurate pressure stabilizing
Source, comparator, first resistor, second resistance, 3rd resistor；Input terminal of the one end of first resistor as voltage detection module,
Connect the first feeder ear, one end of the other end connection second resistance of first resistor, the series connection point of first resistor and second resistance
Connect the positive input terminal of comparator；The other end of second resistance is connect with the first reference；One end of 3rd resistor is supplied with first
Electric end connection, the other end of 3rd resistor are connect with the cathode of the reference end of controllable accurate source of stable pressure, controllable accurate source of stable pressure, this
The negative input end of tie point connection comparator；The anode of controllable accurate source of stable pressure is connect with the first reference；The output of comparator
Hold the output end as voltage detection module.
3. isolation control circuit according to claim 2, it is characterised in that: voltage detection module further includes third switching tube
With the 7th resistance；One end of 7th resistance connects the first feeder ear, and the other end of the 7th resistance connects the drain electrode of third switching tube,
The source electrode of third switching tube is connected to the positive input terminal of comparator, and the grid of third switching tube is connected to the output end of comparator.
4. isolation control circuit according to claim 2 or 3, it is characterised in that: isolation control module includes first switch
Pipe, optocoupler, the 4th resistance and the 5th resistance；Input terminal of the grid of first switch tube as isolation control module, the first open pipe
Drain electrode by the 4th resistance connect the first feeder ear, first switch tube source electrode connection optocoupler primary side diode anode, light
With reference to ground, the collector of optical coupling secondary edges triode is connected to second by the 5th resistance for the cathode connection first of coupling primary side diode
Feeder ear, output end of the emitter of optical coupling secondary edges triode as isolation control module.
5. isolation control circuit according to claim 4, it is characterised in that: switch module includes second switch, first
Capacitor and the 6th resistance；Input terminal of the grid of second switch as switch module, the drain electrode connection second of second switch
Feeder ear, the anode of the source electrode connection first capacitor of the second open pipe, output end of this connecting node as switch module；First electricity
The cathode of appearance is connected to second with reference to ground, and the 6th resistor coupled in parallel is in the input terminal of switch module and second with reference between ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820976701.2U CN208421671U (en) | 2018-06-25 | 2018-06-25 | A kind of isolation control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820976701.2U CN208421671U (en) | 2018-06-25 | 2018-06-25 | A kind of isolation control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208421671U true CN208421671U (en) | 2019-01-22 |
Family
ID=65109744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820976701.2U Withdrawn - After Issue CN208421671U (en) | 2018-06-25 | 2018-06-25 | A kind of isolation control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208421671U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710398A (en) * | 2018-06-25 | 2018-10-26 | 广州金升阳科技有限公司 | A kind of isolation control circuit |
-
2018
- 2018-06-25 CN CN201820976701.2U patent/CN208421671U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710398A (en) * | 2018-06-25 | 2018-10-26 | 广州金升阳科技有限公司 | A kind of isolation control circuit |
| CN108710398B (en) * | 2018-06-25 | 2024-07-19 | 广州金升阳科技有限公司 | Isolation control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202693760U (en) | Electromagnetic relay test device | |
| CN208421671U (en) | A kind of isolation control circuit | |
| KR102365909B1 (en) | Charging status indicator switching circuit | |
| CN201725015U (en) | Relay test tool | |
| CN110456141A (en) | A kind of flash over-current detection circuit and its method | |
| CN108710398A (en) | A kind of isolation control circuit | |
| CN105223533A (en) | A kind of superhigh precision responds DC current prover circuit fast | |
| CN102735882A (en) | Test fixture capable of being automatically powered up | |
| CN109839561B (en) | Switching signal acquisition circuit with state detection function | |
| CN109470960A (en) | A kind of aircraft central power distribution box device for testing functions | |
| CN105301489B (en) | A kind of D.C. contactor contact detection device | |
| CN210348270U (en) | Loop state detection device and detector | |
| CN201788202U (en) | Electronic load circuit | |
| CN211236028U (en) | Novel direct current resistance tester | |
| CN208738876U (en) | A kind of charging unit | |
| CN212031704U (en) | Mutual inductor polarity tester | |
| CN210123465U (en) | Power supply loop detection device | |
| CN209250218U (en) | A kind of input undervoltage protection circuit and driving power | |
| CN210514414U (en) | High-voltage pulse detection circuit | |
| CN208672722U (en) | A kind of DC load fault condition detection circuit | |
| CN208999502U (en) | A kind of intelligence adjustable battery group voltage analog device | |
| CN207611112U (en) | A kind of intelligent distant control CT polarity testers | |
| CN209182730U (en) | A kind of simulated battery | |
| CN209606566U (en) | A kind of diode forward current surge experimental circuit | |
| CN109245492A (en) | A kind of multiple-output electric power |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190122 Effective date of abandoning: 20240719 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190122 Effective date of abandoning: 20240719 |