CN205902121U - Isolated form drive circuit - Google Patents
Isolated form drive circuit Download PDFInfo
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- CN205902121U CN205902121U CN201620907068.2U CN201620907068U CN205902121U CN 205902121 U CN205902121 U CN 205902121U CN 201620907068 U CN201620907068 U CN 201620907068U CN 205902121 U CN205902121 U CN 205902121U
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Abstract
The utility model discloses an isolated form drive circuit relates to the electromagnetic induction heating technology field, mainly constitutes by driver circuit, signal isolation circuit, level shifting circuit and protection circuit, wherein: driver circuit input end is connected with the signal source, and the output and the input of signal isolation circuit of driver circuit are connected, and the output of signal isolation circuit is connected with level shifting circuit's input, level shifting circuit's output and protection circuit connection, the ground wire of signal source and the ground connection on driver circuit, the former limit of signal isolation circuit, the ground wire on the vice limit of signal isolation circuit and the ground connection of level shifting circuit, protection circuit. This circuit is compared with traditional isolating driver, and the circuit is more succinct, and is with low costs, and the reliability is high. Follow opto -coupler type isolating driver to compare, response speed is faster.
Description
Technical field
This utility model is related to electromagnetic induction heating technology field, specifically relates to a kind of isolated form drive circuit.
Background technology
Electromagnetic induction heating derives from the electromagnetic induction phenomenon that faraday finds, that is, the electric current of alternation produces sense in the conductor
Induced current, thus lead to conductor temp.-elevating.Since finding that electric current occurred after heat effect by wire, just occur in that in the world much from
Thing research manufactures the utility model man of electric heater.1890, Sweden technical staff's utility model First induction melting furnace-open
Slot type has core stove；1893, the U.S. occurred in that electric iron blank；1909, the appearance of electric stove achieved and is converted into heat from electric energy
The process of energy；1916, American's utility model locked groove had core stove, and electromagnetic induction technology progresses into practical stage.
Publication No. 105356728a, publication date is that the Chinese patent literature of on 2 24th, 2016 discloses one kind and is not subject to
The impact of former limit dutycycle size and the strong new isolated drive circuit of driving force.The thinking of this patent is that to remove former limit excitatory
Capacitance in circuit, this electric capacity is only involved in constituting former limit degausser.Former limit exciting circuit by former limit pwm control signal,
Original edge voltage source, isolating transformer primary side winding, primary side switch pipe are constituted；When former limit pwm control signal is high level, drive
Primary side switch pipe turns on, and switching tube conducting voltage amplitude is ignored, and the voltage at original edge voltage source two ends is applied directly to isolation and becomes
Depressor primary side winding two ends, by transformer coupled to secondary side rectification circuit, are output as secondary after secondary side rectification circuit rectification
Drive signal, when the isolating transformer former and deputy side turn ratio is 1, the high level amplitude of this drive signal is equal to original edge voltage source two
The voltage magnitude at end, unrelated with the dutycycle size of former limit pwm signal.
Prior art circuits structure with above-mentioned patent documentation as representative is complex, high cost, and reliability is relatively low, response
Speed is also slower.
Utility model content
This utility model aims to the defect and deficiency existing for above-mentioned prior art, provides a kind of isolated form to drive electricity
Road, this utility model achieves transmission and the amplification of signal, and achieves the isolation of input signal and output signal, can be used for altogether
Ground or altogether ground switching tube drive, the driving of the switching tube of such as half-bridge topology or full-bridge topologies.This circuit with
Traditional isolation drive is compared, and circuit is more succinct, low cost, and reliability is high.Compare with optocoupler type isolation drive, response speed is more
Hurry up.
This utility model is by being realized using following technical proposals:
A kind of isolated form drive circuit it is characterised in that: main by drive circuit, signal isolation circuit, level conversion
Circuit and protection circuit form, wherein: drive circuit input is connected, the outfan of drive circuit and signal with signal source
The input of isolation circuit connects, and the outfan of signal isolation circuit is connected with the input of level shifting circuit, level conversion
The outfan of circuit is connected with protection circuit；The ground wire of signal source is connected with the ground wire of drive circuit, signal isolation circuit former limit
Connect, the ground wire of signal isolation circuit secondary is connected with the ground wire of level shifting circuit, protection circuit.
Described drive circuit adopts driving chip ir2101s or driving chip ir2010s；Described drive circuit
Including driving chip s1, resistance r4, resistance r5 and resistance r6, one end of described resistance r4 is connected with signal source, the other end with
Second pin of driving chip s1 connects, and the first of driving chip s1 and the 8th pin connection power supply vcc1, driving chip
4th and the 6th pin of s1 connects ground wire gnd1；Resistance r5 and resistance r6 series connection, a termination driving chip s1 of resistance r5
The 7th pin, one end earth lead gnd1 of resistance r6；The midpoint of resistance r5 and resistance r6 series connection is the defeated of drive circuit
Go out end.
Resistance r4 is current-limiting resistance, and the size of resistance depends on the level value of signal source.
Resistance r5 is raster data model resistance, and the size of resistance depends on the grid capacitance size of driven mos pipe.
Resistance r6 is grid pull down resistor, prevents in the case of not having drive signal because electrostatic charge is in mos tube grid
Accumulation leads to mislead.
The selection of driving chip s1 selects single channel to drive according to actual needs, and two-way drives or multichannel drives.
Described signal isolation circuit is mainly made up of isolating transformer t1, mos pipe q1 and fly-wheel diode d3: wherein every
It is made up of three windings from transformator t1, specifically two primary side winding, a vice-side winding: two primary side winding have public affairs
Hold altogether, therefore former limit has three taps, first tap connects power supply vcc2, be that second tap of common port connects mos pipe q1
Drain electrode, the 3rd tap connect the negative pole of fly-wheel diode d3；The drain electrode of mos pipe q1 is taken out with second of isolating transformer t1
Head connects, and grid is connected with the outfan of drive circuit, source ground；The negative pole of fly-wheel diode d3 and isolating transformer t1
The 3rd tap connect, plus earth；The ground wire of signal isolation circuit is connected with the ground wire of drive circuit.
Described level shifting circuit includes resistance r1, resistance r2, resistance r3 and electric capacity c1, described resistance r2 and resistance
Connect with resistance r1 again after r3 parallel connection, the one end after resistance r2 and resistance r3 parallel connection is connected with wherein one end of signal isolation circuit
Connect, one end of resistance r1 is connected with the other end of signal isolation circuit, electric capacity c1 is in parallel with resistance r2 and resistance r3, signal isolation
The current flowing resistance r1 of circuit output end, resistance r2 and resistance r3, produce voltage signal in resistance r2 and resistance r3 two ends.c1
For filter high-frequency ripple.
Described protection circuit is made up of two tvs Transient Suppression Diodes, the negative pole of tvs Transient Suppression Diode d1 with
The negative pole of tvs Transient Suppression Diode d2 is connected, and two positive poles are in parallel with the outfan of level shifting circuit.When output signal has wave
When gushing, tvs pipe can be effectively overanxious, to ensure to export the clean and tidy of pwmout1 drive waveforms.
Compared with prior art, the beneficial effects of the utility model show:
In this utility model, the isolated form drive circuit that adopted, two-way isolating transformer drive signal, waveform more preferably,
In hgher efficiency；Adapt to wide input voltage range, reliable and stable；Can be applicable to electrical induction, Switching Power Supply, wireless charging etc.；
This isolated form drive circuit achieves transmission and the amplification of signal, and achieves the isolation of input signal and output signal, can use
In common ground or altogether ground switching tube drive, the driving of the switching tube of such as half-bridge topology or full-bridge topologies.This electricity
Road is compared with traditional isolation drive, and circuit is more succinct, low cost, and reliability is high.Compare with optocoupler type isolation drive, response speed
Degree is faster.
Brief description
Below in conjunction with specification drawings and specific embodiments, the utility model is described in further detail, its
In:
Fig. 1 is isolated form drive circuit block diagram；
Fig. 2 is isolated form driver circuit schematic diagram.
In figure labelling:
501st, drive circuit, 502, signal isolation circuit, 503, level shifting circuit, 504, protection circuit.
Specific embodiment
Embodiment 1
As a better embodiment of the present utility model, it discloses a kind of isolated form drive circuit, mainly by driving
Device circuit 501, signal isolation circuit 502, level shifting circuit 503 and protection circuit 504 form, wherein: drive circuit 501
Input is connected with signal source, and the outfan of drive circuit 501 is connected with the input of signal isolation circuit 502, signal every
Outfan from circuit 502 is connected with the input of level shifting circuit 503, the outfan of level shifting circuit 503 and protection
Circuit 504 connects；The ground wire of signal source is connected with the ground wire of drive circuit 501, signal isolation circuit 502 former limit, signal every
Ground wire from circuit 502 secondary is connected with the ground wire of level shifting circuit 503, protection circuit 504.
Embodiment 2
As preferred forms of the present utility model, described drive circuit 501 adopt driving chip ir2101s or
Driving chip ir2010s；Described drive circuit 501 includes driving chip s1, resistance r4, resistance r5 and resistance r6, described
One end of resistance r4 be connected with signal source, the other end is connected with second pin of driving chip s1, the of driving chip s1
One and the 8th pin connects power supply vcc1, and the 4th and the 6th pin of driving chip s1 connects ground wire gnd1；Resistance r5 and
Resistance r6 connects, the 7th pin of a termination driving chip s1 of resistance r5, one end earth lead gnd1 of resistance r6；Resistance r5
Midpoint with resistance r6 series connection is the outfan of drive circuit 501.
Resistance r4 is current-limiting resistance, and the size of resistance depends on the level value of signal source.
Resistance r5 is raster data model resistance, and the size of resistance depends on the grid capacitance size of driven mos pipe.
Resistance r6 is grid pull down resistor, prevents in the case of not having drive signal because electrostatic charge is in mos tube grid
Accumulation leads to mislead.
The selection of driving chip s1 selects single channel to drive according to actual needs, and two-way drives or multichannel drives.
Described signal isolation circuit 502 is mainly made up of isolating transformer t1, mos pipe q1 and fly-wheel diode d3, its
Middle isolating transformer t1 is made up of three windings, specifically two primary side winding, a vice-side winding；Two primary side winding have one
Individual common port, therefore former limit has three taps, first tap connects power supply vcc2, is that second tap of common port connects mos
The drain electrode of pipe q1, the 3rd tap connects the negative pole of fly-wheel diode d3；The drain electrode of mos pipe q1 and the second of isolating transformer t1
Individual tap connects, and grid is connected with the outfan of drive circuit 501, source ground；The negative pole of fly-wheel diode d3 and isolation
3rd tap of transformator t1 connects, plus earth；The ground wire of signal isolation circuit 502 and the ground wire of drive circuit 501
Connect.
Described level shifting circuit 503 includes resistance r1, resistance r2, resistance r3 and electric capacity c1, described resistance r2 and
Connect with resistance r1 again after resistance r3 parallel connection, the one end after resistance r2 and resistance r3 parallel connection is with signal isolation circuit 502 wherein
One end connects, and one end of resistance r1 is connected with the other end of signal isolation circuit 502, and electric capacity c1 and resistance r2 and resistance r3 is simultaneously
Connection, the current flowing resistance r1 of signal isolation circuit 502 outfan, resistance r2 and resistance r3, at resistance r2 and resistance r3 two ends
Produce voltage signal.C1 is used for filter high-frequency ripple.
Described protection circuit 504 is made up of two tvs Transient Suppression Diodes, and tvs Transient Suppression Diode d1's is negative
Pole is connected with the negative pole of tvs Transient Suppression Diode d2, and two positive poles are in parallel with the outfan of level shifting circuit 503.Work as output
When signal has surge, tvs pipe can be effectively overanxious, to ensure to export the clean and tidy of pwmout1 drive waveforms.
Claims (8)
1. a kind of isolated form drive circuit it is characterised in that: main by drive circuit (501), signal isolation circuit (502),
Level shifting circuit (503) and protection circuit (504) composition, wherein: drive circuit (501) input is connected with signal source,
The outfan of drive circuit (501) is connected with the input of signal isolation circuit (502), signal isolation circuit (502) defeated
Go out end to be connected with the input of level shifting circuit (503), the outfan of level shifting circuit (503) and protection circuit (504)
Connect；The ground wire of signal source is connected with the ground wire of drive circuit (501), signal isolation circuit (502) former limit, signal isolation electricity
The ground wire of road (502) secondary is connected with the ground wire of level shifting circuit (503), protection circuit (504).
2. a kind of isolated form drive circuit according to claim 1 it is characterised in that: described drive circuit (501)
Using driving chip ir2101s or driving chip ir2010s；Described drive circuit (501) includes driving chip s1, resistance
R4, resistance r5 and resistance r6, one end of described resistance r4 is connected with signal source, and second of the other end and driving chip s1 is drawn
Foot connects, and the first of driving chip s1 and the 8th pin connection power supply vcc1, the 4th and the 6th pin of driving chip s1
Connect ground wire gnd1；Resistance r5 and resistance r6 series connection, the 7th pin of a termination driving chip s1 of resistance r5, resistance r6's
One end earth lead gnd1；The midpoint of resistance r5 and resistance r6 series connection is the outfan of drive circuit (501).
3. a kind of isolated form drive circuit according to claim 2 it is characterised in that: resistance r4 be current-limiting resistance.
4. a kind of isolated form drive circuit according to claim 2 it is characterised in that: resistance r5 be raster data model resistance.
5. a kind of isolated form drive circuit according to claim 2 it is characterised in that: resistance r6 be grid pull down resistor.
6. a kind of isolated form drive circuit according to claim 1 it is characterised in that: described signal isolation circuit
(502) mainly it is made up of isolating transformer t1, mos pipe q1 and fly-wheel diode d3, wherein isolating transformer t1 is by three windings
Composition, specifically two primary side winding, a vice-side winding；Two primary side winding have a common port, therefore former limit has three to take out
Head, first tap connects power supply vcc2, is the drain electrode of second tap connection mos pipe q1 of common port, the 3rd tap is even
Connect the negative pole of fly-wheel diode d3；The drain electrode of mos pipe q1 is connected with second tap of isolating transformer t1, grid and driver
The outfan of circuit (501) connects, source ground；The negative pole of fly-wheel diode d3 is connected with the 3rd tap of isolating transformer t1
Connect, plus earth；The ground wire of signal isolation circuit (502) is connected with the ground wire of drive circuit (501).
7. a kind of isolated form drive circuit according to claim 1 it is characterised in that: described level shifting circuit
(503) go here and there with resistance r1 again after including resistance r1, resistance r2, resistance r3 and electric capacity c1, described resistance r2 and resistance r3 parallel connection
Connection, resistance r2 and resistance r3 parallel connection after one end be connected with wherein one end of signal isolation circuit (502), one end of resistance r1 and
The other end of signal isolation circuit (502) connects, and electric capacity c1 is in parallel with resistance r2 and resistance r3, and signal isolation circuit (502) is defeated
Go out current flowing resistance r1, resistance r2 and the resistance r3 at end, produce voltage signal in resistance r2 and resistance r3 two ends.
8. a kind of isolated form drive circuit according to claim 1 it is characterised in that: described protection circuit (504) by
Two tvs Transient Suppression Diode compositions, the negative pole of tvs Transient Suppression Diode d1 is negative with tvs Transient Suppression Diode d2's
Extremely connected, two positive poles are in parallel with the outfan of level shifting circuit (503).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620907068.2U CN205902121U (en) | 2016-08-12 | 2016-08-12 | Isolated form drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620907068.2U CN205902121U (en) | 2016-08-12 | 2016-08-12 | Isolated form drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205902121U true CN205902121U (en) | 2017-01-18 |
Family
ID=57779643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620907068.2U Active CN205902121U (en) | 2016-08-12 | 2016-08-12 | Isolated form drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205902121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728715A (en) * | 2019-01-09 | 2019-05-07 | 全球能源互联网研究院有限公司 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
-
2016
- 2016-08-12 CN CN201620907068.2U patent/CN205902121U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728715A (en) * | 2019-01-09 | 2019-05-07 | 全球能源互联网研究院有限公司 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
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