CN109698686A - A kind of easy high current optical coupled switch circuit - Google Patents
A kind of easy high current optical coupled switch circuit Download PDFInfo
- Publication number
- CN109698686A CN109698686A CN201811553706.5A CN201811553706A CN109698686A CN 109698686 A CN109698686 A CN 109698686A CN 201811553706 A CN201811553706 A CN 201811553706A CN 109698686 A CN109698686 A CN 109698686A
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- power supply
- high current
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- 230000003287 optical effect Effects 0.000 title claims abstract description 15
- 230000001052 transient effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 description 18
- 238000002955 isolation Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 230000005669 field effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004347 surface barrier Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/785—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling field-effect transistor switches
Abstract
The invention discloses a kind of easy high current optical coupled switch circuits, it is characterized in that, including supply input unit, MCU control unit, optocoupler IC unit, power supply output unit, in which: the input terminal of the supply input unit connects power supply, output end connection power supply output unit；The power supply output unit is for exporting the power supply；The MCU control unit is for controlling opening or closing for the optocoupler IC unit by output switching signal；The optocoupler IC unit is used to control the on-off of the power supply by opening or closing for itself.
Description
Technical field
The present invention relates to high current optical coupled switch circuits, and in particular to a kind of easy high current optical coupled switch circuit.
Background technique
In practical applications, vulnerabilities scan forceful electric power is the developing key technology of China's automation control, cannot be lacked, it
Be the key that social production, people's lives can conveniently, go on smoothly, while being also related to the safety of circuit, environment contactee
Safety.
In vulnerabilities scan forceful electric power, relatively common is the leading control system of single-chip microcontroller.Single-chip microcontroller has small in size, again
The features such as amount is light, strong antijamming capability, comprehensive cost performance is high.Its main operational principle is as follows: by sensor for temperature, wet
The parameters such as degree, voltage, electric current, revolving speed measure, and then transmit a signal to single-chip microcontroller, and single-chip microcontroller judges the signal
Measured value, is mainly compared with setting value, obtains a result, and actuating mechanism controls relevant device is allowed to reach control by processing
Purpose.
In practical applications, electromagnetic relay is comparatively using more component, and electromagnetic relay uses electromagnetism
Isolation, realizes being isolated for control terminal and load end, the small control signal of input terminal, reaches and directly drives high current and bear
It carries, chip microcontroller can be cooperated to be up to the isolation control of upper kilovolt.
The prior art is quite mature in the heavy-current control more than safe voltage (i.e. 36V), but 12V-36V's
In the control of voltage range, almost without the design of special control circuit.
However under actual technology of Internet of things application scenarios, the single-chip microcontroller and 12V-36V of 3.3V-5V can be frequently encountered
The application scenarios of sensor communication, in the environment of nowadays advocating energy conservation and environmental protection, low-power consumption becomes most of electronic equipments
Important indicator, if the sensor of 12V or more in a system is allowed to be powered on always, it will generate a large amount of unnecessary disappears
Consumption, at this moment, one is suitble to the control switch of this voltage range just to seem essential.
In such systems, it can also require that circuit is simple, it is small in size to occupy, to protect to circuit etc. more, these are to pass
What the heavy-current control switch of system cannot achieve.
Summary of the invention
The problems such as present invention is not too big, easy to install for the volume for solving traditional relay in the prior art, provides one kind
Easy high current optical coupled switch circuit, realize using the signal of small voltage, low current control big voltage, high current signal it is logical
Disconnected, switching function achievees the purpose that working sensor switchs controllable, low-power consumption.
The present invention is achieved through the following technical solutions:
A kind of easy high current optical coupled switch circuit, which is characterized in that including supply input unit, MCU control unit,
Optocoupler IC unit, power supply output unit, in which:
The input terminal of the supply input unit connects power supply, output end connection power supply output unit；
The power supply output unit is for exporting the power supply；
The MCU control unit is for controlling opening or closing for the optocoupler IC unit by output switching signal；
The optocoupler IC unit is used to control the on-off of the power supply by opening or closing for itself.
Design principle of the invention: small voltage is realized by optocoupler IC unit, the signal of low current controls big voltage, big electricity
On-off, the switching function for flowing signal achieve the purpose that working sensor switchs controllable, low-power consumption, improve late-class circuit and protect energy
Power；The advantages of light-coupled isolation is: duty ratio is arbitrarily adjustable；It is isolated high pressure resistant；Strong antijamming capability, at present electrostatic shielding
Optocoupler is readily available, and the isolation performance between strong and weak electricity is fine, in addition, optocoupler category current mode device, to voltage endurance noise energy
It effectively inhibits；Transmission signal scope is from DC to several MHz, and wherein linear optical coupling is particularly suitable for signal and feeds back this IC can bearing
Input voltage is up to 30V, and current output capability is up to 3.5A, under the application scenarios of most of internet of things sensors completely
Enough.
Further, the supply input unit is additionally provided with transient voltage diode D1, the transient voltage diode
The plus earth of D1, cathode are connect with the input terminal of supply input unit.
Further, the supply input unit is additionally provided with capacitor C1, anode and the supply input list of the capacitor C1
The input terminal connection of member, cathode ground connection.
Further, the optocoupler IC unit includes control terminal pin 1,2, and wherein control terminal pin 2 is latter by resistance
End is connected to MCU output end, and the other end connects the grid of MOS isolated gate FET；Output pin 5, input terminal pin 4,6
And NC (both sky connects No Connected) pin, the input terminal pin 4,6 connect power supply, the connection of output pin 5 supplies
Electricity output unit.
Further, the anode of the power supply output unit connects output pin 5, cathode ground connection.
It further, further include Schottky diode, the anode of the Schottky diode connects the output pin
5, cathode connection power supply output unit.
Further, the output end of the MCU control unit is provided with MOS isolated gate FET, the MOS insulated gate
The grid of field-effect tube is connect with the output end of the MCU control unit, and source electrode connects the output end of the supply input unit,
Drain electrode connects the control terminal pin 1 of the optocoupler IC unit.
Compared with prior art, the present invention having the following advantages and benefits:
The present invention can be realized the switch and on-off of the weak level signal control 12V-30V strong voltage using 3.3V-5V, and
The current-carrying capability of maximum 3.5A is provided when opening., it can be achieved that control to useless power consumption, reaches in internet of things sensors system
To energy-saving and environment-friendly purpose；And compact of the present invention, it is easy to assembly, save trouble.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is circuit theory schematic diagram of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation for explaining only the invention, are not made
For limitation of the invention.
Embodiment
As shown in Figure 1,
The supply input unit is additionally provided with transient voltage diode D1, and the anode of the transient voltage diode D1 connects
Ground, cathode are connect with the input terminal of supply input unit, this circuit uses SMAJ28CA lightning protection TVS pipe in input terminal, wherein
TVS (Transient Voltage Suppresser Transient Voltage Suppressor) is that a kind of new and effective circuit generally used is protected
Device is protected, it has the response time (subnanosecond grade) being exceedingly fast and quite high surge absoption ability.When its both ends are subjected to wink
Between high energy impact events when, the impedance value between both ends can be become Low ESR from high impedance with high speed by TVS, to absorb one
A instantaneous large-current, thus its both end voltage clamp down on one it is scheduled numerically, to protect subsequent circuit element
Not by the impact of high voltage transient spike.Just because of this, TVS can be used for protecting equipment or circuit from electrostatic, inductive
Overvoltage caused by the transient voltage and inductive lightning generated when load switching, so the present invention is allowed entirely using the TVS pipe
Circuit has the ability of anti-lightning, improves equipment field operation stability, has reached input lightning protection purpose, severe in field
The damage being struck by lightning to late-class circuit can be effectively prevent under environment；Using the big alminium electrolytic condenser of 330uF 50V, circuit is improved
To the responding ability of instantaneous power.
The optocoupler IC unit includes control terminal pin 1,2, output pin 5, input terminal pin 4,6 and NC pin,
The input terminal pin 4,6 connects power supply, the connection of the output pin 5 power supply output unit, and optocoupler IC unit uses AQV251G
PhotoMOS relay, the core devices as switching circuit.Realize light-coupled isolation, light-coupled isolation is exactly that photo-coupler is used to carry out
Isolation, the substantially course of work of the IC are as follows: if certain sensor needs 24V power voltage supply, then the 24V to power first accesses of the invention
VCC network is the VCC of pin 6,4 in figure, and when the switching signal at the end MCU is input to 1,2 pin, VCC voltage will be corresponded to
Open and close be output to 5 pins, to realize the control to isolation voltage.
The output end of the MCU control unit is provided with MOS isolated gate FET, the MOS isolated gate FET
Grid connect with the output end of the MCU control unit, source electrode connects the output end of the supply input unit, drain electrode connection
The control terminal pin 1 of the optocoupler IC unit, the part use the metal-oxide-semiconductor of A2SHB model, and mos pipe is that is, exhausted in integrated circuits
Edge field-effect tube.It is metal (metal)-oxide (oxid)-semiconductor (semiconductor) field effect transistor.
Or claim to be metal-insulator (insulator)-semiconductor.The source and drain of metal-oxide-semiconductor can be exchanged, and all be
The N-type region formed in p-type backgate, metal-oxide-semiconductor are the electricity to be drained by being added in the voltage of input terminal grid come control output end
Stream.Metal-oxide-semiconductor be voltage-controlled device it by the characteristic for the voltage control device being added on grid, will not occur to switch as triode
When because of charge-storage effect caused by base current, therefore in switch application, the switching speed of metal-oxide-semiconductor should compare triode
Fastly.So the present invention forms switching circuit using metal-oxide-semiconductor, big voltage and the part MCU are kept apart, realized to MCU circuit
Protection；The metal-oxide-semiconductor pressure voltage reaches 20V, and by R1 and R2 point partial pressure setting operating point, the highest input of this circuit reaches
40V, it is fully sufficient in the range use of 12V-30V；When the end MCU input high level (3.3V-5V) signal, metal-oxide-semiconductor is led
It is logical, "ON" signal is inputted to rear class optocoupler；When the end MCU inputs GND signal, metal-oxide-semiconductor cut-off, rear class optocoupler will receive "Off" letter
Number.
It further include Schottky diode, the anode of the Schottky diode connects the output pin 5, cathode connection
Power supply output unit, output voltage pass through a B540C Schottky diode, two pole of Schottky after the output of output pin 5
Pipe is with its inventor's Schottky doctor (Schottky) name, and SBD is Schottky barrier diode
The abbreviation of (SchottkyBarrierDiode is abbreviated as SBD).SBD is not to contact shape using P-type semiconductor and N-type semiconductor
At the production of PN junction principle, but the metal-semiconductor junction principle production for utilizing metal and semiconductor contact to be formed.Therefore,
SBD is also referred to as metal-semiconductor (contact) diode or surface barrier diode, it is a kind of hot carrier diode, low function
Consumption, high current, ultra-speed semiconductor device.Its reverse recovery time is extremely short (may diminish to several nanoseconds), and forward conduction voltage drop is only
0.4V or so, and rectified current can reach thousands of milliamperes.These good characteristics be fast recovery diode incomparable, institute
It is exported again after Schottky diode to external loading with the present invention by Current Voltage is exported, just protects switch portion in this way
Point, the damage of external short circuit, reversal connection to circuit is prevented, has achieved the purpose that output protection.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of easy high current optical coupled switch circuit, which is characterized in that including supply input unit, MCU control unit, light
Coupling IC unit, power supply output unit, in which:
The input terminal of the supply input unit connects power supply, output end connection power supply output unit；
The power supply output unit is for exporting the power supply；
The MCU control unit is for controlling opening or closing for the optocoupler IC unit by output switching signal；
The optocoupler IC unit is used to control the on-off of the power supply by opening or closing for itself.
2. a kind of easy high current optical coupled switch circuit according to claim 1, which is characterized in that the supply input
Unit is additionally provided with transient voltage diode D1, the plus earth of the transient voltage diode D1, cathode and supply input list
The input terminal connection of member.
3. a kind of easy high current optical coupled switch circuit according to claim 1, which is characterized in that the supply input
Unit is additionally provided with capacitor C1, and the anode of the capacitor C1 is connect with the input terminal of supply input unit, cathode ground connection.
4. a kind of easy high current optical coupled switch circuit according to claim 1, which is characterized in that the optocoupler IC is mono-
Member includes control terminal pin 1,2, output pin 5, input terminal pin 4,6 and NC pin, and the input terminal pin 4,6 connects electricity
Source, the connection of the output pin 5 power supply output unit.
5. a kind of easy high current optical coupled switch circuit according to claim 4, which is characterized in that described for electricity output
The anode of unit connects output pin 5, cathode ground connection.
6. a kind of easy high current optical coupled switch circuit according to claim 4, which is characterized in that further include Schottky
Diode, the anode of the Schottky diode connect the output pin 5, cathode connection power supply output unit.
7. a kind of easy high current optical coupled switch circuit according to claim 4, which is characterized in that the MCU control
The output end of unit is provided with MOS isolated gate FET, and the grid and the MCU of the MOS isolated gate FET control
The output end of unit connects, and source electrode connects the output end of the supply input unit, and drain electrode connects the control of the optocoupler IC unit
End pin 1 processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553706.5A CN109698686A (en) | 2018-12-18 | 2018-12-18 | A kind of easy high current optical coupled switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811553706.5A CN109698686A (en) | 2018-12-18 | 2018-12-18 | A kind of easy high current optical coupled switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109698686A true CN109698686A (en) | 2019-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811553706.5A Pending CN109698686A (en) | 2018-12-18 | 2018-12-18 | A kind of easy high current optical coupled switch circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203872383U (en) * | 2014-05-27 | 2014-10-08 | 苏州工业职业技术学院 | Discharging circuit of solar LED lighting device |
| CN104198017A (en) * | 2014-07-30 | 2014-12-10 | 成都千嘉科技有限公司 | Pulse output signal processing system of flow metering device |
| WO2017020782A1 (en) * | 2015-07-31 | 2017-02-09 | 中兴通讯股份有限公司 | Battery charging and discharging control circuit and battery charging and discharging system |
| CN207389118U (en) * | 2017-10-19 | 2018-05-22 | 厦门兴联集团有限公司 | Intelligent automobile emergency starting power supply |
| CN108092361A (en) * | 2017-12-26 | 2018-05-29 | 深圳市恒浩伟业科技有限公司 | The battery protecting circuit of low standby power loss and car emergency startup power supply |
-
2018
- 2018-12-18 CN CN201811553706.5A patent/CN109698686A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203872383U (en) * | 2014-05-27 | 2014-10-08 | 苏州工业职业技术学院 | Discharging circuit of solar LED lighting device |
| CN104198017A (en) * | 2014-07-30 | 2014-12-10 | 成都千嘉科技有限公司 | Pulse output signal processing system of flow metering device |
| WO2017020782A1 (en) * | 2015-07-31 | 2017-02-09 | 中兴通讯股份有限公司 | Battery charging and discharging control circuit and battery charging and discharging system |
| CN207389118U (en) * | 2017-10-19 | 2018-05-22 | 厦门兴联集团有限公司 | Intelligent automobile emergency starting power supply |
| CN108092361A (en) * | 2017-12-26 | 2018-05-29 | 深圳市恒浩伟业科技有限公司 | The battery protecting circuit of low standby power loss and car emergency startup power supply |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190430 |
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| RJ01 | Rejection of invention patent application after publication |