CN209692425U - A kind of quick alternating current switching circuit of active low pressure - Google Patents
A kind of quick alternating current switching circuit of active low pressure Download PDFInfo
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- CN209692425U CN209692425U CN201920676257.7U CN201920676257U CN209692425U CN 209692425 U CN209692425 U CN 209692425U CN 201920676257 U CN201920676257 U CN 201920676257U CN 209692425 U CN209692425 U CN 209692425U
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Abstract
A kind of quick alternating current switching circuit of active low pressure includes power isolation circuit, MOSFET driving circuit, MOSFET gating circuit and control unit.The power isolation circuit is connect with MOSFET driving circuit, and the MOSFET driving circuit is connect with MOSFET gating circuit, and described control unit is connect with MOSFET driving circuit；The application have the characteristics that small in size, the service life is long, without electric arc, speed is fast, reverse leakage current is small, hardware integration degree is high, high reliablity.This circuit, which can be applicable to, to shake in electrical protective device, realizes the effect for being switched fast AC power source, and switch speed can reach within 100uS, can make backup power supply and alternating current seamless switching.
Description
Technical field
The utility model relates to technical field of electric equipment, and in particular to a kind of active quick alternating current switching circuit of low pressure.
Background technique
The common low-voltage alternating-current electric switch in the country generally has: knife switch, travel switch, the time relay, button, exchange connect
Tentaculum, breaker, air switch, electromagnetic relay, bidirectional triode thyristor (abbreviation SCR) etc..From switching speed, SCR is
It is most fast, but SCR needs could be turned off in alternating voltage zero-crossing point, and in the case where 50Hz alternating current, the turn-off speed of SCR is most
Slowly need access to 10MS, these switch switching speeds be all unable to reach Microsecond grade, some pairs of alternating-current switch rate requests very
High occasion, these switches are all unable to satisfy requirement.
Utility model content
Existing switching technique there are aiming at the problem that, the utility model provides a kind of active low pressure quick alternating-current switch electricity
Road can realize being switched fast for power supply in the occasion for needing to be switched fast power supply.
The technology employed by the present utility model is a kind of quick alternating current switching circuit of active low pressure, including power supply every
From circuit, MOSFET driving circuit, MOSFET gating circuit and control unit.The power isolation circuit and MOSFET drive
Circuit connection, the MOSFET driving circuit are connect with MOSFET gating circuit, described control unit and MOSFET driving circuit
Connection；
The power isolation circuit includes: first the-the four isolated power supply module of isolated power supply module, the first input capacitance-
4th input capacitance, first the-the four output capacitance of output capacitance and first the-the four load resistance of load resistance；
First pin of the first isolated power supply module is connected to ground, the second pin of the first isolated power supply module and outer
Power supply connection is connect, first input capacitance is connected in parallel between the first pin and second pin of the first isolated power supply module, institute
The 5th pin for stating the first isolated power supply module is connect with the 8th pin of the first photoelectrical coupler, the first isolated power supply mould
4th pin of block is isolator connect with first, and first output capacitance is connected in parallel on first with the first load resistance and electricity is isolated
Between 4th pin of source module and the 5th pin；
First pin of the second isolated power supply module is connected to ground, the second pin of the second isolated power supply module and outer
Power supply connection is connect, second input capacitance is connected in parallel between the first pin and second pin of the second isolated power supply module, institute
The 5th pin for stating the second isolated power supply module is connect with the 8th pin of the second photoelectrical coupler, the second isolated power supply mould
4th pin of block is isolator connect with second, and second output capacitance is connected in parallel on second with the second load resistance and electricity is isolated
Between 4th pin of source module and the 5th pin；
First pin of the third isolated power supply module is connected to ground, the second pin of third isolated power supply module and outer
Power supply connection is connect, the third input capacitance is connected in parallel between the first pin and second pin of third isolated power supply module, institute
The 5th pin for stating third isolated power supply module is connect with the 8th pin of third photoelectrical coupler, the third isolated power supply mould
4th pin of block is isolator connect with third, and the third output capacitance is connected in parallel on third with third load resistance and electricity is isolated
Between 4th pin of source module and the 5th pin；
First pin of the 4th isolated power supply module is connected to ground, the second pin of the 4th isolated power supply module and outer
Power supply connection is connect, the 4th input capacitance is connected in parallel between the first pin and second pin of the 4th isolated power supply module, institute
The 5th pin for stating the 4th isolated power supply module is connect with the 8th pin of the 4th photoelectrical coupler, the 4th isolated power supply mould
4th pin of block is isolator connect with the 4th, and the 4th output capacitance is connected in parallel on the 4th with the 4th load resistance and electricity is isolated
Between 4th pin of source module and the 5th pin；
The MOSFET driving circuit includes first the-the four photoelectrical coupler of photoelectrical coupler, the first current-limiting resistance-the eight
Current-limiting resistance, first the-the four shunt capacitance of shunt capacitance, first the-the four discharge diode of discharge diode；
The second pin of first photoelectrical coupler is connect with one end of the first current-limiting resistance, first current-limiting resistance
The other end connect with control unit, the ground of the third pin of first photoelectrical coupler and control unit connects, described the
5th pin of one photoelectrical coupler is isolator connect with first, the 8th pin of first photoelectrical coupler also with first by
One end of road capacitor connects, and the other end of first shunt capacitance is isolator connect with first, first photoelectrical coupler
The 6th pin connect respectively with the cathode of one end of the second current-limiting resistance, the first discharge diode with the 7th pin, described
The other end of two current-limiting resistances connects with the anode of the first discharge diode, one end of the first balance resistance, the first metal-oxide-semiconductor respectively
It connects；
The second pin of second photoelectrical coupler is connect with one end of third current-limiting resistance, the third current-limiting resistance
The other end connect with control unit, the ground of the third pin of second photoelectrical coupler and control unit connects, described the
5th pin of two photoelectrical couplers is isolator connect with second, the 8th pin of second photoelectrical coupler also with second by
One end of road capacitor connects, and the other end of second shunt capacitance is isolator connect with second, second photoelectrical coupler
The 6th pin connect respectively with the cathode of one end of the 4th current-limiting resistance, the second discharge diode with the 7th pin, described
The other end of four current-limiting resistance R8 respectively with the anode of the second discharge diode, one end of the second balance resistance, the second metal-oxide-semiconductor
Grid connection；
The second pin of the third photoelectrical coupler is connect with one end of the 5th current-limiting resistance, the 5th current-limiting resistance
The other end connect with control unit, the ground of the third pin of the third photoelectrical coupler and control unit connects, described the
5th pin of three photoelectrical couplers is isolator connect with third, and the 8th pin of the third photoelectrical coupler is also and by third
One end of road capacitor connects, and the other end of the third shunt capacitance is isolator connect with third, the third photoelectrical coupler
The 6th pin connect respectively with the cathode of one end of the 6th current-limiting resistance, third discharge diode with the 7th pin, described
The other end of six current-limiting resistances respectively with the anode of third discharge diode, one end of third balance resistance, third metal-oxide-semiconductor grid
Pole connection；
The second pin of 4th photoelectrical coupler is connect with one end of the 7th current-limiting resistance, the 7th current-limiting resistance
The other end connect with control unit, the ground of the third pin of the 4th photoelectrical coupler and control unit connects, described the
5th pin of four photoelectrical couplers is isolator connect with the 4th, the 8th pin of the 4th photoelectrical coupler also with the 4th by
One end of road capacitor connects, and the other end of the 4th shunt capacitance is isolator connect with the 4th, the 4th photoelectrical coupler
The 6th pin connect respectively with the cathode of one end of the 8th current-limiting resistance, the 4th discharge diode with the 7th pin, described
The other end of eight current-limiting resistances respectively with the anode of the 4th discharge diode, one end of the 4th balance resistance, the 4th metal-oxide-semiconductor grid
Pole connection；
The MOSFET gating circuit, including first the-the four metal-oxide-semiconductor of metal-oxide-semiconductor, first the-the four balance resistance of balance resistance,
Four diode of first diode-the；
The drain electrode of first metal-oxide-semiconductor is connect with alternating current, with the cathode of the second diode respectively, second diode
Anode is connect with the other end of the second balance resistance；The source electrode of first metal-oxide-semiconductor respectively with the anode of first diode, first
The other end of balance resistance connects, and the other end of first balance resistance is also isolator connect with first, the one or two pole
The cathode of pipe is connect with the drain electrode of the second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor is connect with the other end of the second balance resistance,
The other end of second balance resistance is also isolator connect with second；
The drain electrode of the third metal-oxide-semiconductor is connect with alternating current, with the cathode of the 4th diode respectively, the 4th diode
Anode is connect with the other end of the 4th balance resistance；The source electrode of the third metal-oxide-semiconductor respectively with the anode of third diode, third
The other end of balance resistance connects, and the other end of the third balance resistance is also isolator connect with third, the three or two pole
The cathode of pipe is connect with the drain electrode of the 4th metal-oxide-semiconductor, and the source electrode of the 4th metal-oxide-semiconductor is connect with the other end of the 4th balance resistance,
The other end of 4th balance resistance is also isolator connect with the 4th；
The control unit for controlling opening and turning off for metal-oxide-semiconductor, the control unit can for single-chip microcontroller, DSP,
Hardware circuit or FPGA；
The external power supply is 12V.
The advantageous effects of the utility model:
The utility model proposes a kind of active quick alternating current switching circuit of low pressure, have small in size, the service life is long, without electric arc,
The feature that speed is fast, reverse leakage current is small, hardware integration degree height, high reliablity.This circuit, which can be applicable to, to shake in electrical protective device,
Realize the effect for being switched fast AC power source, switch speed can reach within 100uS, and backup power supply and alternating current can be made without seaming and cutting
It changes.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model；
Fig. 2 is power isolation circuit in the example of the utility model；
Fig. 3 is MOSFET driving circuit and MOSFET gating circuit in the example of the utility model；
A is MOSFET driving circuit in figure；B is MOSFET gating circuit.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
As shown in Figure 1, the utility model provides a kind of quick alternating current switching circuit of active low pressure, including isolated from power electricity
Road, MOSFET driving circuit, MOSFET gating circuit and control unit.The power isolation circuit and MOSFET driving circuit connect
It connects, the MOSFET driving circuit is connect with MOSFET gating circuit, and described control unit is connect with MOSFET driving circuit；In
Control unit is selected as single-chip microcontroller as control in present embodiment；
As shown in Fig. 2, power isolation circuit provides necessary power supply to the quick alternating current switching circuit of active low pressure, using electricity
The method of source isolation has carried out isolated from power, realizes the electric isolution of control system and driving circuit, improves the anti-dry of system
Disturb ability.It include: first the-the four isolated power supply module of isolated power supply module (REG1, REG2, REG3, REG4), the first input electricity
Hold-the four input capacitance C2, C4, C7, C10, the load of first-the four output capacitance C3, C5, C8, C11 of output capacitance and first
Resistance-the four load resistance R1, R5, R9, R10；
The first pin of first isolated power supply module REG1 is connect with ground GND, and the second of the first isolated power supply module REG1
Pin is connect with external 12V power supply, and the first input capacitance C2 is connected in parallel on the first pin and of the first isolated power supply module REG1
Between two pins, the 5th pin of the first isolated power supply module REG1 is connect with the 8th pin of the first photoelectrical coupler PT1, the
The 4th pin of one isolated power supply module REG1 with first isolator GND12A connect, the first output capacitance C3 and first load electricity
Resistance R1 is connected in parallel between the 4th pin and the 5th pin of the first isolated power supply module REG1；
The first pin of second isolated power supply module REG2 is connect with ground GND, and the second of the second isolated power supply module REG2
Pin is connect with external 12V power supply, and the second input capacitance C4 is connected in parallel on the first pin and of the second isolated power supply module REG2
Between two pins, the 5th pin of the second isolated power supply module REG2 is connect with the 8th pin of the second photoelectrical coupler PT2, the
The 4th pin of two isolated power supply module REG2 with second isolator GND12B connect, the second output capacitance C5 and second load electricity
Resistance R5 is connected in parallel between the 4th pin and the 5th pin of the second isolated power supply module REG2；
The first pin of third isolated power supply module REG3 is connect with ground GND, and the second of third isolated power supply module REG3
Pin is connect with external 12V power supply, and third input capacitance C7 is connected in parallel on the first pin and of third isolated power supply module REG3
Between two pins, the 5th pin of third isolated power supply module REG3 is connect with the 8th pin of third photoelectrical coupler PT3, the
Isolator GND12C is connect the 4th pin of three isolated power supply module REG3 with third, third output capacitance C8 and third load electricity
Resistance R9 is connected in parallel between the 4th pin and the 5th pin of third isolated power supply module REG3；
The first pin of 4th isolated power supply module REG4 is connect with ground GND, and the second of the 4th isolated power supply module REG4
Pin is connect with external 12V power supply, and the 4th input capacitance C10 is connected in parallel on the first pin and of the 4th isolated power supply module REG4
Between two pins, the 5th pin of the 4th isolated power supply module REG4 is connect with the 8th pin of the 4th photoelectrical coupler PT4, the
The 4th pin of four isolated power supply module REG4 with the 4th isolator GND12D connect, the 4th output capacitance C11 and the 4th load
Resistance R10 is connected in parallel between the 4th pin and the 5th pin of the 4th isolated power supply module REG4；
In the present embodiment, input voltage is+12VDC, is powered after input capacitance filters to power isolation module, outlet side
It powers after output capacitance filters to post-stage drive circuit, load resistance makes power isolation module steady operation.By+12VDC electricity
Source isolates the mutually independent 12V power supply in 4 tunnels to drive 4 MOSFET.
As shown in part A in Fig. 3, can MOSFET driving circuit be the key that stablize, quickly control MOSFET, this electricity
Road, which can be realized, carries out fast charging and discharging to the grid of MOSFET, while also having carried out high and low voltage isolation, keeps system safe and reliable.
MOSFET driving circuit includes first the-the four photoelectrical coupler of photoelectrical coupler, first the-the eight current-limiting resistance of current-limiting resistance, the
Four shunt capacitance of bypass capacitor-the, first the-the four discharge diode of discharge diode；
The second pin of first photoelectrical coupler PT1 is connect with one end of the first current-limiting resistance R2, the first current-limiting resistance R2
The other end connect with control unit, the ground DGND connection of the third pin and single-chip microcontroller of the first photoelectrical coupler PT1, the first light
The 5th pin of electric coupler PT1 with first isolator GND12A connect, the 8th pin of the first photoelectrical coupler PT1 is also with
One end of bypass capacitor C1 connects, the other end of the first shunt capacitance C1 with first isolator GND12A connect, the first photoelectricity
The 6th pin of coupler PT1 and the 7th the pin yin with one end of the second current-limiting resistance R3, the first discharge diode D2 respectively
Pole connection, the other end of the second current-limiting resistance R3 respectively with the anode of the first discharge diode D2, the first balance resistance R4 one
The grid connection at end, the first metal-oxide-semiconductor Q1；
The second pin of second photoelectrical coupler PT2 is connect with one end of third current-limiting resistance R7, third current-limiting resistance R7
The other end connect with control unit, the ground DGND connection of the third pin and single-chip microcontroller of the second photoelectrical coupler PT2, the second light
The 5th pin of electric coupler PT2 with second isolator GND12B connect, the 8th pin of the second photoelectrical coupler PT2 is also with
One end of two shunt capacitance C6 connects, the other end of the second shunt capacitance C6 with second isolator GND12B connect, the second photoelectricity
The 6th pin of coupler PT2 and the 7th the pin yin with one end of the 4th current-limiting resistance R8, the second discharge diode D4 respectively
Pole connection, the other end of the 4th current-limiting resistance R8 respectively with the anode of the second discharge diode D4, the second balance resistance R6 one
The grid connection at end, the second metal-oxide-semiconductor Q2；
The second pin of third photoelectrical coupler PT3 is connect with one end of the 5th current-limiting resistance R11, the 5th current-limiting resistance
The other end of R11 is connect with control unit, the ground DGND connection of the third pin and single-chip microcontroller of third photoelectrical coupler PT3, the
Isolator GND12C is connect the 5th pin of three photoelectrical coupler PT3 with third, and the 8th pin of third photoelectrical coupler PT3 is also
It is connect with one end of third shunt capacitance C9, isolator GND12C is connect the other end of third shunt capacitance C9 with third, third
The 6th pin of photoelectrical coupler PT3 and the 7th pin respectively with one end of the 6th current-limiting resistance R12, third discharge diode D6
Cathode connection, the other end of the 6th current-limiting resistance R12 respectively with the anode of third discharge diode D6, third balance resistance
The grid connection of one end, third metal-oxide-semiconductor Q3 of R13；
The second pin of 4th photoelectrical coupler PT4 is connect with one end of the 7th current-limiting resistance R15, the 7th current-limiting resistance
The other end of R15 is connect with control unit, the ground DGND connection of the third pin and single-chip microcontroller of the 4th photoelectrical coupler PT4, the
The 5th pin of four photoelectrical coupler PT4 with the 4th isolator GND12D connect, the 8th pin of the 4th photoelectrical coupler PT4 is also
Connect with one end of the 4th shunt capacitance C12, the other end of the 4th shunt capacitance C12 with the 4th isolator GND12D connect,
The 6th pin and the 7th pin of four photoelectrical coupler PT4 respectively with one end of the 8th current-limiting resistance R14, the 4th discharge diode
The cathode of D7 connects, the other end of the 8th current-limiting resistance R14 respectively with the anode of the 4th discharge diode D7, the 4th balance resistance
The grid connection of one end of R16, the 4th metal-oxide-semiconductor Q4；
In the present embodiment, first-the four shunt capacitance C1, C6, C9, C12 of shunt capacitance is used to absorb high frequency electric source dry
It disturbs,
As shown in part B in Fig. 3, due to having protection diode inside MOSFET, it is unable to control negative-phase sequence curent, MOSFET
It is used always in the control to direct current.The method that this circuit uses series opposing diode, has carried out forward direction to alternating current
With reversed gating, reliably MOSFET is applied in the control of alternating current；
MOSFET gating circuit, including first the-the four metal-oxide-semiconductor Q1-Q4 of metal-oxide-semiconductor, first the-the four balance resistance of balance resistance
R4, R6, R13, R16, first diode-the four diode D1, D3, D5, D8；
The drain electrode of first metal-oxide-semiconductor Q1 is connect with the cathode of alternating current, the second diode D3 respectively, the anode of the second diode D3
It is connect with the other end of the second balance resistance R6；The source electrode of first metal-oxide-semiconductor Q1 respectively with the anode of first diode D1, first flat
Weigh resistance R4 the other end connection, the other end of the first balance resistance R4 also with first isolator GND12A connect, the one or two pole
The cathode of pipe D1 is connect with the drain electrode of the second metal-oxide-semiconductor Q2, and the other end of the source electrode of the second metal-oxide-semiconductor Q2 and the second balance resistance R6 connect
Connect, the other end of the second balance resistance R6 also with second isolator GND12B connect；
The drain electrode of third metal-oxide-semiconductor Q3 is connect with the cathode of alternating current, the 4th diode D8 respectively, the anode of the 4th diode D8
It is connect with the other end of the 4th balance resistance R16；The source electrode of third metal-oxide-semiconductor Q1 respectively with the anode of third diode D5, third
The other end of balance resistance R13 connects, and also isolator GND12C is connect the other end of third balance resistance R13 with third, third
The cathode of diode D5 is connect with the drain electrode of the 4th metal-oxide-semiconductor Q4, and the source electrode of the 4th metal-oxide-semiconductor Q4 is another with the 4th balance resistance R16's
One end connection, the other end of the 4th balance resistance R16 also with the 4th isolator GND12D connect；
In the present embodiment, needed to make the rapid turn-on and turn-off of MOSFET to MOSFET according to the characteristic of MOSFET
Grid capacitance fast charging and discharging, when MOS1, MOS2, MOS3, MOS4 input be high level when, photoelectrical coupler PT1, PT2,
Input light emitting diode inside PT3, PT4 is lighted, and optical signal passes to the totem output circuit of outlet side, makes totem
Top triode is connected rapidly, and 6 feet and 7 feet of photoelectrical coupler then export high level, by current-limiting resistance to the grid of MOSFET
Pole charging can make grid capacitance charge rapidly, make four since fan-out capability reaches 3A in short-term for the photoelectrical coupler of selection
MOSFET is connected rapidly, and due to there is the presence of gate diode, when alternating current input is positive, electric current passes through Q1, D1, bears
Load, Q4 and D8 form forward loop, and when alternating current input is negative sense, electric current is by Q3, D5, load, Q2, D3 formation negative sense
Circuit, the quick alternating-current switch of active low pressure is in the conductive state at this time.Due to having backward dioded inside MOSFET, this circuit must
There must be gate diode, otherwise will be unable to the on-off of control alternating current.When control signal MOS1, MOS2, MOS3, MOS4 input
When for low level, the active quick alternating-current switch of low pressure will be in an off state, and PT1, PT2, PT3, PT4 will export low electricity at this time
Flat, the gate charge of MOSFET falls by the lower part triode quick release of discharge diode and optocoupler outlet side totem, can
So that MOSFET is rapidly switched off.
Claims (3)
1. a kind of quick alternating current switching circuit of active low pressure characterized by comprising
Power isolation circuit, MOSFET driving circuit, MOSFET gating circuit and control unit；
The power isolation circuit is connect with MOSFET driving circuit, and the MOSFET driving circuit and MOSFET gating circuit connect
It connects, described control unit is connect with MOSFET driving circuit；
The power isolation circuit includes: first the-the four isolated power supply module of isolated power supply module, the first input capacitance-the four
Input capacitance, first the-the four output capacitance of output capacitance and first the-the four load resistance of load resistance；
First pin of the first isolated power supply module is connected to ground, the second pin of the first isolated power supply module and external electricity
Source connection, first input capacitance is connected in parallel between the first pin and second pin of the first isolated power supply module, and described the
5th pin of one isolated power supply module is connect with the 8th pin of the first photoelectrical coupler, the first isolated power supply module
4th pin is isolator connect with first, and first output capacitance and the first load resistance are connected in parallel on the first isolated power supply mould
Between 4th pin of block and the 5th pin；
First pin of the second isolated power supply module is connected to ground, the second pin of the second isolated power supply module and external electricity
Source connection, second input capacitance is connected in parallel between the first pin and second pin of the second isolated power supply module, and described the
5th pin of two isolated power supply modules is connect with the 8th pin of the second photoelectrical coupler, the second isolated power supply module
4th pin is isolator connect with second, and second output capacitance and the second load resistance are connected in parallel on the second isolated power supply mould
Between 4th pin of block and the 5th pin；
First pin of the third isolated power supply module is connected to ground, the second pin of third isolated power supply module and external electricity
Source connection, the third input capacitance is connected in parallel between the first pin and second pin of third isolated power supply module, and described the
5th pin of three isolated power supply modules is connect with the 8th pin of third photoelectrical coupler, the third isolated power supply module
4th pin is isolator connect with third, and the third output capacitance and third load resistance are connected in parallel on third isolated power supply mould
Between 4th pin of block and the 5th pin；
First pin of the 4th isolated power supply module is connected to ground, the second pin of the 4th isolated power supply module and external electricity
Source connection, the 4th input capacitance is connected in parallel between the first pin and second pin of the 4th isolated power supply module, and described the
5th pin of four isolated power supply modules is connect with the 8th pin of the 4th photoelectrical coupler, the 4th isolated power supply module
4th pin is isolator connect with the 4th, and the 4th output capacitance and the 4th load resistance are connected in parallel on the 4th isolated power supply mould
Between 4th pin of block and the 5th pin；
The MOSFET driving circuit includes first the-the four photoelectrical coupler of photoelectrical coupler, first the-the eight current limliting of current-limiting resistance
Resistance, first the-the four shunt capacitance of shunt capacitance, first the-the four discharge diode of discharge diode；
The second pin of first photoelectrical coupler is connect with one end of the first current-limiting resistance, first current-limiting resistance it is another
One end is connect with control unit, and the third pin of first photoelectrical coupler and the ground of control unit connect, first light
5th pin of electric coupler is isolator connect with first, and the 8th pin of first photoelectrical coupler is also electric with the first bypass
One end of appearance connects, and the other end of first shunt capacitance is isolator connect with first, and the of first photoelectrical coupler
Six pins are connect with the cathode of one end of the second current-limiting resistance, the first discharge diode respectively with the 7th pin, second limit
The other end of leakage resistance is connect with the anode of the first discharge diode, one end of the first balance resistance, the first metal-oxide-semiconductor respectively；
The second pin of second photoelectrical coupler is connect with one end of third current-limiting resistance, the third current-limiting resistance it is another
One end is connect with control unit, and the third pin of second photoelectrical coupler and the ground of control unit connect, second light
5th pin of electric coupler is isolator connect with second, and the 8th pin of second photoelectrical coupler is also electric with the second bypass
One end of appearance connects, and the other end of second shunt capacitance is isolator connect with second, and the of second photoelectrical coupler
Six pins are connect with the cathode of one end of the 4th current-limiting resistance, the second discharge diode respectively with the 7th pin, the 4th limit
The other end of leakage resistance R8 respectively with the anode of the second discharge diode, one end of the second balance resistance, the second metal-oxide-semiconductor grid
Connection；
The second pin of the third photoelectrical coupler is connect with one end of the 5th current-limiting resistance, the 5th current-limiting resistance it is another
One end is connect with control unit, and the third pin of the third photoelectrical coupler and the ground of control unit connect, the third light
5th pin of electric coupler is isolator connect with third, and the 8th pin of the third photoelectrical coupler also bypasses electricity with third
One end of appearance connects, and the other end of the third shunt capacitance is isolator connect with third, and the of the third photoelectrical coupler
Six pins are connect with the cathode of one end of the 6th current-limiting resistance, third discharge diode respectively with the 7th pin, the 6th limit
The other end of leakage resistance connects with the grid of the anode of third discharge diode, one end of third balance resistance, third metal-oxide-semiconductor respectively
It connects；
The second pin of 4th photoelectrical coupler is connect with one end of the 7th current-limiting resistance, the 7th current-limiting resistance it is another
One end is connect with control unit, and the third pin of the 4th photoelectrical coupler and the ground of control unit connect, the 4th light
5th pin of electric coupler is isolator connect with the 4th, and the 8th pin of the 4th photoelectrical coupler is also electric with the 4th bypass
One end of appearance connects, and the other end of the 4th shunt capacitance is isolator connect with the 4th, and the of the 4th photoelectrical coupler
Six pins are connect with the cathode of one end of the 8th current-limiting resistance, the 4th discharge diode respectively with the 7th pin, the 8th limit
The other end of leakage resistance connects with the grid of the anode of the 4th discharge diode, one end of the 4th balance resistance, the 4th metal-oxide-semiconductor respectively
It connects；
The MOSFET gating circuit includes: first the-the four metal-oxide-semiconductor of metal-oxide-semiconductor, first the-the four balance resistance of balance resistance, first
Four diode of diode-the；
The drain electrode of first metal-oxide-semiconductor is connect with alternating current, with the cathode of the second diode respectively, the anode of second diode
It is connect with the other end of the second balance resistance；The source electrode of first metal-oxide-semiconductor is balanced with the anode of first diode, first respectively
The other end of resistance connects, and the other end of first balance resistance is also isolator connect with first, the first diode
Cathode is connect with the drain electrode of the second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor is connect with the other end of the second balance resistance, described
The other end of second balance resistance is also isolator connect with second；
The drain electrode of the third metal-oxide-semiconductor is connect with alternating current, with the cathode of the 4th diode respectively, the anode of the 4th diode
It is connect with the other end of the 4th balance resistance；The source electrode of the third metal-oxide-semiconductor is balanced with the anode of third diode, third respectively
The other end of resistance connects, and the other end of the third balance resistance is also isolator connect with third, the third diode
Cathode is connect with the drain electrode of the 4th metal-oxide-semiconductor, and the source electrode of the 4th metal-oxide-semiconductor is connect with the other end of the 4th balance resistance, described
The other end of 4th balance resistance is also isolator connect with the 4th.
2. a kind of active quick alternating current switching circuit of low pressure according to claim 1, which is characterized in that the control list
For member for controlling opening and turning off for metal-oxide-semiconductor, the control unit can be single-chip microcontroller, DSP, hardware circuit or FPGA.
3. a kind of active quick alternating current switching circuit of low pressure according to claim 1, which is characterized in that the external electricity
Source is 12V.
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| CN201920676257.7U CN209692425U (en) | 2019-05-13 | 2019-05-13 | A kind of quick alternating current switching circuit of active low pressure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751559A (en) * | 2020-12-25 | 2021-05-04 | 兰州飞行控制有限责任公司 | Multi-path analog switch control circuit based on optical coupling isolation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751559A (en) * | 2020-12-25 | 2021-05-04 | 兰州飞行控制有限责任公司 | Multi-path analog switch control circuit based on optical coupling isolation |
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