CN108809282A - A kind of DC switch circuit - Google Patents
A kind of DC switch circuit Download PDFInfo
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- CN108809282A CN108809282A CN201810548080.2A CN201810548080A CN108809282A CN 108809282 A CN108809282 A CN 108809282A CN 201810548080 A CN201810548080 A CN 201810548080A CN 108809282 A CN108809282 A CN 108809282A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/10—Modifications for increasing the maximum permissible switched voltage
- H03K17/102—Modifications for increasing the maximum permissible switched voltage in field-effect transistor switches
Abstract
The invention discloses a kind of DC switch circuits, including direct-flow input end, overvoltage protection mechanism, under-voltage protection mechanism, reverse connecting protection mechanism, overcurrent protection mechanism, short current protective mechanism, control mechanism, accessory power supply mechanism, driving mechanism, switching mechanism and DC output end to constitute；The present invention effectively increases the environmental suitability of DC switch circuit, makes it in applying working condition complexity, and the especially larger occasion of vibratory impulse intensity still is able to work normally, and advantageously reduces rear class equipment application risk, improves security of system；Provide perfect defencive function; the response speed and control accuracy for improving defencive function can upgrade protection circuit by the adjustment of simple hardware circuit, eliminate software sampling and controlling unit; the complexity for reducing circuit design and control method, has compressed development cost.
Description
Technical field
The invention belongs to switching circuit fields, are related to a kind of DC switch circuit, specifically a kind of DC switch circuit.
Background technology
DC switch circuit being switched off and on load circuit as one kind, is answered in fields such as production, life, national defence and military projects
With very extensive, and the research for DC switch circuit is also always maintained at powerful developing state.With dc switch electricity
The complication of road applying working condition and the diversification of load equipment, overcurrent capability, long-distance intelligent control function, wait for defencive function
Machine loss, environmental suitability, reliability and service life etc. are needed to be considered when having become DC switch circuit design important asks
Topic.
Currently, DC switch circuit is mainly based on mechanical and electromagnetic type, and develops towards electronic type direction.Mechanically
DC switch circuit controls the break-make between contact by operating mechanism and realizes switching function, and operating mechanism and switching mechanism are equal
It is mechanical.Electromagnetic type DC switch circuit controls the break-make between contact by the operating mechanism that electromagnetism merges and realizes switch work(
Can, operating mechanism is electromagnetism fusion type, and switching mechanism is still mechanical.The control that electronic direct-current switching circuit passes through itself
The break-make of circuit control power switch realizes switching function, and control mechanism and switching mechanism are electronic type.
Mechanical DC switch circuit and electromagnetic type DC switch circuit are opened by the break-make realization controlled between contact
Function is closed, technological deficiency is mainly manifested in：Environmental suitability and reliability are poor, hold in the larger occasion of vibratory impulse intensity
Easily there is the mistake break-make phenomenon between contact, increases rear class electrical equipment application risk, reduce the safety of system；It threads off
Device design is complicated and is affected by temperature larger；Defencive function is single, only has the single defencive function such as overcurrent, short circuit, under-voltage
Even without defencive function, defencive function action delay is apparent, real-time is not strong and is affected by temperature larger；Lack remote control
With intelligent control expanded function, it is only capable of realizing the break-make control between contact, Wu Fashi by way of directly operating ontology
The remote control of existing DC switch circuit and intelligent control function extension；There are switching arc, the electric arc of generation is easily damaged tactile
Head, fault current break time is relatively long, cannot achieve real-time flexible quick acting；Arc quenching system is needed, volume weight is big,
Service life is short.
Current electronic direct-current switching circuit, although the more mechanical DC switch circuit of environmental suitability and electromagnetic type are straight
Stream switching circuit improves, but its circuit and control mode still follow mechanical and electromagnetic type DC switch circuit
Control model, only made improvement in detection circuit part but idling consumption be apparent, overcurrent capability and defencive function are also not to the utmost
Perfect, scalability is to be improved.To solve drawbacks described above, a solution is now provided.
Invention content
The purpose of the present invention is to provide a kind of DC switch circuits.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of DC switch circuit, including direct-flow input end, overvoltage protection mechanism, under-voltage protection mechanism, reverse connecting protection machine
Structure, overcurrent protection mechanism, short current protective mechanism, control mechanism, accessory power supply mechanism, driving mechanism, switching mechanism and direct current are defeated
Outlet is constituted；The direct-flow input end is electrically connected with overvoltage protection mechanism, under-voltage protection mechanism, reverse connecting protection mechanism and switching mechanism
It connects, the reverse connecting protection mechanism is electrically connected with accessory power supply mechanism, and the control mechanism is electrically connected with accessory power supply mechanism, described
Accessory power supply mechanism is electrically connected with short current protective mechanism, overcurrent protection mechanism, and the short current protective mechanism is electrically connected with driving mechanism
It connects, the driving mechanism is electrically connected with switching mechanism, and the switching mechanism is protected with DC output end, short current protective mechanism and overcurrent
Mechanism electrical connection is protected, the under-voltage protection mechanism is connected electrically between driving mechanism and short current protective mechanism, the overcurrent protection
Mechanism is electrically connected with driving mechanism；
The first Wiring port P1, the second Wiring port P2, third Wiring port P3 are additionally provided on the DC switch circuit
With the 4th Wiring port P4, the first Wiring port P1, the second Wiring port P2, third Wiring port P3 and the 4th Wiring port P4
For DC switch circuit external interface, it to be used for DC switch circuit external cabling.
Further, the overvoltage protection mechanism is used for the input overvoltage protection of DC switch circuit, the under-voltage protection
Input undervoltage of the mechanism for DC switch circuit is protected, and the reverse connecting protection mechanism is used for the input reverse-connection of DC switch circuit
Protection, output overcurrent of the overcurrent protection mechanism for DC switch circuit are protected, and the short current protective mechanism is used for direct current
The output short circuit protection of switching circuit；
The control mechanism is for the work start-up and shut-down control of DC switch circuit, remote control function extension and intelligent control
Function Extension, the accessory power supply mechanism are used for overvoltage protection mechanism, under-voltage protection mechanism, the reverse connecting protection of DC switch circuit
The power supply of mechanism, overcurrent protection mechanism, short current protective mechanism and driving mechanism, the driving mechanism are opened for break-make control direct current
The switching mechanism on powered-down road, the break-make that the switching mechanism is used between DC switch circuit input anode and output cathode carry
For channel.
Further, the overvoltage protection mechanism include the first capacitance C1, the 6th resistance R6, eleventh resistor R11,
Third capacitance C3, the 5th voltage reference power supply V5, the 4th voltage reference power supply V4, the tenth resistance R10 and the second photoelectrical coupler
E2；Wherein, the 6th resistance R6 connects with eleventh resistor R11, the first capacitance C1 and concatenated 6th resistance R6 and
Eleventh resistor R11 is in parallel, and the eleventh resistor R11 is in parallel with third capacitance C3, the 5th voltage reference power supply V5 electricity
It is connected between the 6th resistance R6 and eleventh resistor R11, the 4th voltage reference power supply V4 and the 5th voltage reference power supply
V5 connects.
Further, the under-voltage protection mechanism includes the first capacitance C1, the 7th resistance R7, twelfth resistor R12, the 4th
Capacitance C4, the 4th voltage reference power supply V4, the tenth resistance R10 and the second photoelectrical coupler E2；
The 7th resistance R7 and twelfth resistor R12 series connection, the first capacitance C1 and concatenated 7th resistance R7 and the tenth
Two resistance R12 are in parallel；It is also parallel with the 4th capacitance C4 on the twelfth resistor R12, is also parallel on the 4th capacitance C4
4th reference power supply V4, the 4th reference power supply V4 connect with the second photoelectrical coupler E2, the second photoelectrical coupler E2
It connects with the tenth resistance R10, the tenth resistance R10 is electrically connected with VCC2；
The reverse connecting protection mechanism is the 6th diode V6, and the 6th diode V6 connects with the first capacitance C1.
Further, the overcurrent protection mechanism includes the 16th capacitance C16, the first linear hall sensor T1, the tenth
Three capacitance C13, the 17th resistance R17, the 19th resistance R19, the 16th resistance R16, the 21st resistance R21, the first operation
Amplifier N1, the 15th capacitance C15, the 14th capacitance C14, the 18th resistance R18, the 20th resistance R20, the 17th capacitance
C17, the tenth voltage reference power supply V10, the tenth resistance R10 and the second photoelectrical coupler E2；
The 16th capacitance C16 is in parallel with the first linear hall sensor T1, is additionally provided on the overcurrent protection mechanism
Power end VCC2 and ground terminal GND2, the power end VCC2 is connected to the VCC interfaces of the first linear hall sensor T1, described
Ground terminal GND2 is connected on the GND interfaces of the first linear hall sensor T1；The OUT of the first linear hall sensor T1
Interface is connected with the 17th resistance R17, and the 13rd capacitance C13 is connected on the OUT interfaces of the first linear hall sensor T1
And the 17th between resistance R17, the 13rd capacitance C13 other ends are connect with ground terminal GND2；
The 17th resistance R17 is connected to the in-phase input end of the first operational amplifier N1, the 17th resistance R17
The 16th resistance R16 is also electrically connected between the in-phase input end of the first operational amplifier N1, the 16th resistance R16 is another
One end is connected on ground terminal GND2, and the inverting input of the first operational amplifier N1 is also electrically connected with the 19th resistance
R19, the 19th resistance R19 other ends are connect with ground terminal with GND2, on the output end of the first operational amplifier N1
It is also electrically connected with the 18th resistance R18, the 18th resistance R18 connects with the 20th resistance R20, the 20th resistance
The R20 other ends are connected on ground terminal GND2, are also parallel with the 17th capacitance C17 on the 20th resistance R20, and the described tenth
The tenth voltage reference power supply V10 is also parallel on seven capacitance C17；The tenth resistance R10 and the second photoelectrical coupler E2 series connection,
The tenth voltage reference power supply V10 is connected electrically between the tenth resistance R10 and the second photoelectrical coupler E2；
It is parallel with the 21st resistance R21 on the inverting input and output end of the first operational amplifier N1, it is described
The 15th capacitance C15 and the 14th capacitance C14, the one end the 15th capacitance C15 are also parallel on first operational amplifier N1
It is connected with VCC2, the 15th capacitance C15 other ends are connected with ground terminal GND2.
Further, the short current protective mechanism includes second resistance R2, the 8th resistance R8, the 9th resistance R9, the one or two
Pole pipe V1, the second capacitance C2, tertiary voltage reference power supply V3, the first photoelectrical coupler E1, first resistor R1, the 5th resistance R5,
Tenth resistance R10 and the second photoelectrical coupler E2；
The first diode V1 once connects with the 8th resistance R8, the 9th resistance R9, the first diode V1 and
It is also electrically connected between eight resistance R8 on second resistance R2, the 9th resistance R9 and is also parallel with the second capacitance C2, described second
Capacitance C2 is in parallel with tertiary voltage reference power supply V3, and the tertiary voltage reference power supply V3 is electrically connected with the first photoelectrical coupler E1
It connects, first resistor R1 is also electrically connected on the first photoelectrical coupler E1, the first resistor R1 is electrically connected with VCC1, described
It is also electrically connected with the 5th resistance R5 on first photoelectrical coupler E1, the second light is also electrically connected on the first photoelectrical coupler E1
Electric coupler E2, the second photoelectrical coupler E2 are electrically connected with the tenth resistance R10.
Further, the control mechanism is first switch K1；The accessory power supply mechanism includes the 9th capacitance C9, the 6th
Diode V6, the 7th voltage-stabiliser tube V7, the tenth capacitance C10, the 11st capacitance C11, the 9th voltage-stabiliser tube V9, thirteenth resistor R13,
14 resistance R14, the 15th resistance R15, the 12nd capacitance C12, the second triode Q2, the second modular power source U2, the 7th capacitance
C7, the 8th capacitance C8, the first voltage-stablizer U1, the 8th Schottky diode V8, the first inductance L1, the 5th capacitance C5 and the 6th capacitance
C6；
The 9th capacitance C9 is sequentially connected in series with the 6th diode V6 and the 7th voltage-stabiliser tube V7, on the 7th voltage-stabiliser tube V7
It is also parallel with the tenth capacitance C10, the 11st capacitance C11, the 11st capacitance C11 are also parallel on the tenth capacitance C10
Also in parallel with concatenated first switch K1 and the 9th voltage-stabiliser tube V9, the 9th voltage-stabiliser tube V9 connects with the 14th resistance R14, institute
The 14th resistance R14 is stated to connect with the 12nd capacitance C12 in parallel and the 15th resistance R15；The second triode Q2 and company
Be connected on the 14th resistance R14 between the 12nd capacitance C12 in parallel and the 15th resistance R15, the second triode Q2 with
Thirteenth resistor R13 is electrically connected, and the second modular power source U2, the second module electricity are also parallel on the thirteenth resistor R13
The source front ends U2 are parallel with the 7th capacitance C7, and the front ends the 7th capacitance C7 are parallel with the 8th capacitance C8, the 8th capacitance C8 mono-
End is electrically connected with VCC1, and the 8th capacitance C8 other ends are electrically connected with GND1；
+ IN the mouths of the second modular power source U2 are also connected with the Vin mouths of the first modular power source U1, the first module electricity
The GND mouths of source U1 are grounded, and the Vo mouths of the first modular power source U1 are connected with the 8th Schottky diode V8, first inductance
The one end L1 is connected on the FB mouths of the first modular power source U1, and the first inductance L1 other ends are connected to Vo mouthfuls and the 8th Schottky
Between diode V8, it is also parallel with the 5th capacitance C5 on concatenated first inductance L1 and the 8th Schottky diode V8, described
The 6th capacitance C6 is also parallel on five capacitance C5, the one end the 6th capacitance C6 is connected with VCC2, and the 6th capacitance C6 is another
End is electrically connected with the 4th Wiring port P4；
The input of the second modular power source U2 is isolated with output.
Further, the driving mechanism includes the second photoelectrical coupler E2,3rd resistor R3, the 4th resistance R4 and second
Voltage-stabiliser tube V2；The second photoelectrical coupler E2 is electrically connected with 3rd resistor R3, the 3rd resistor R3 and the second voltage-stabiliser tube V2
Series connection, the second voltage-stabiliser tube V2 are in parallel with the 4th resistance R4；
The switching mechanism is the first MOS power switch tube Q1, the 4th resistance R4 and the first MOS power switch tubes Q1
Parallel connection, described one end first MOS power switch tube Q1 are electrically connected with GND1, and the GND1 is electrically connected with third Wiring port P3.
Beneficial effects of the present invention：The present invention effectively increases the environmental suitability of DC switch circuit, it is made to use
Operating mode is complicated, and the especially larger occasion of vibratory impulse intensity still is able to work normally, and advantageously reduces rear class equipment and uses wind
Security of system is improved in danger；Perfect defencive function is provided, the response speed and control accuracy of defencive function are improved, is led to
Protection circuit can be upgraded by crossing simple hardware circuit adjustment, eliminated software sampling and controlling unit, reduced electricity
Road is designed and the complexity of control method, has compressed development cost；Expansion interface is controlled provided with outside, is DC switch circuit
Remote control and intelligent control function extension provide possibility；Waiting for for DC switch circuit is reduced by standby sleep mode
Machine is lost；It got rid of the mechanical contact of Traditional DC switch, eliminated switching arc, eliminated arc quenching system, effectively reduced straight
The volume weight for flowing switching circuit, improves the service life and reliability of DC switch circuit.
Description of the drawings
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is that present system connects block diagram；
Fig. 2 is the circuit connection diagram of the present invention.
Specific implementation mode
As shown in Figure 1, a kind of DC switch circuit, including direct-flow input end, overvoltage protection mechanism, under-voltage protection mechanism,
Reverse connecting protection mechanism, overcurrent protection mechanism, short current protective mechanism, control mechanism, accessory power supply mechanism, driving mechanism, switching on and shutting down
Structure and DC output end are constituted；It the direct-flow input end and overvoltage protection mechanism, under-voltage protection mechanism, reverse connecting protection mechanism and opens
Shutting mechanism is electrically connected, and the reverse connecting protection mechanism is electrically connected with accessory power supply mechanism, the control mechanism and accessory power supply mechanism
Electrical connection, the accessory power supply mechanism are electrically connected with short current protective mechanism, overcurrent protection mechanism, the short current protective mechanism and drive
Motivation structure is electrically connected, and the driving mechanism is electrically connected with switching mechanism, the switching mechanism and DC output end, short-circuit protection machine
Structure and overcurrent protection mechanism electrical connection, the under-voltage protection mechanism are connected electrically between driving mechanism and short current protective mechanism, institute
Overcurrent protection mechanism is stated to be electrically connected with driving mechanism；
Wherein, the overvoltage protection mechanism is used for the input overvoltage protection of DC switch circuit, the under-voltage protection mechanism
Input undervoltage for DC switch circuit is protected, and input reverse-connection of the reverse connecting protection mechanism for DC switch circuit is protected
Shield, output overcurrent of the overcurrent protection mechanism for DC switch circuit are protected, and the short current protective mechanism is opened for direct current
The output short circuit protection on powered-down road, the control mechanism are used for the work start-up and shut-down control of DC switch circuit, remote control function
Extension and intelligent control function extension, the accessory power supply mechanism are used for the overvoltage protection mechanism of DC switch circuit, institute
State under-voltage protection mechanism, the reverse connecting protection mechanism, the overcurrent protection mechanism, the short current protective mechanism and the driving machine
Structure is powered, and the switching mechanism break-make of the driving mechanism for DC switch circuit controls, and the switching mechanism is for being
Break-make between DC switch circuit input anode and output cathode provides channel；
First Wiring port P1, the second Wiring port P2, third Wiring port P3 and the 4th Wiring port P4 open for direct current
Powered-down road external interface is used for DC switch circuit external cabling.
As shown in Fig. 2, the overvoltage protection mechanism includes the first capacitance C1, the 6th resistance R6, eleventh resistor R11, the
Three capacitance C3, the 5th voltage reference power supply V5, the 4th voltage reference power supply V4, the tenth resistance R10 and the second photoelectrical coupler E2；
Wherein, the 6th resistance R6 connects with eleventh resistor R11, the first capacitance C1 and concatenated 6th resistance R6 and the tenth
One resistance R11 is in parallel, and the eleventh resistor R11 is in parallel with third capacitance C3, the 5th voltage reference power supply V5 electrical connections
Between the 6th resistance R6 and eleventh resistor R11, the 4th voltage reference power supply V4 and the 5th voltage reference power supply V5 go here and there
Connection；
The under-voltage protection mechanism includes the first capacitance C1, the 7th resistance R7, twelfth resistor R12, the 4th capacitance C4, the
Four voltage reference power supply V4, the tenth resistance R10 and the second photoelectrical coupler E2；
The reverse connecting protection mechanism is the 6th diode V6；
The overcurrent protection mechanism include the 16th capacitance C16, the first linear hall sensor T1, the 13rd capacitance C13,
17th resistance R17, the 19th resistance R19, the 16th resistance R16, the 21st resistance R21, the first operational amplifier N1,
15 capacitance C15, the 14th capacitance C14, the 18th resistance R18, the 20th resistance R20, the 17th capacitance C17, the tenth voltage
Reference power supply V10, the tenth resistance R10 and the second photoelectrical coupler E2；
The short current protective mechanism includes second resistance R2, the 8th resistance R8, the 9th resistance R9, the first diode V1,
Two capacitance C2, tertiary voltage reference power supply V3, the first photoelectrical coupler E1, first resistor R1, the 5th resistance R5, the tenth resistance
R10 and the second photoelectrical coupler E2；
The control mechanism is first switch K1；
The accessory power supply mechanism include the 9th capacitance C9, the 6th diode V6, the 7th voltage-stabiliser tube V7, the tenth capacitance C10,
11st capacitance C11, the 9th voltage-stabiliser tube V9, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 12nd electricity
Hold C12, the second triode Q2, the second modular power source U2, the 7th capacitance C7, the 8th capacitance C8, the first voltage-stablizer U1, the 8th Xiao Te
Based diode V8, the first inductance L1, the 5th capacitance C5 and the 6th capacitance C6, the input of the second modular power source U2 and output every
From；
The driving mechanism includes the second photoelectrical coupler E2,3rd resistor R3, the 4th resistance R4 and the second voltage-stabiliser tube V2；
The switching mechanism is the first MOS power switch tubes Q1.
When tertiary voltage reference power supply V3, the 4th voltage reference power supply V4, the 5th voltage reference power supply V5, the tenth voltage base
When 1 foot pair, the 3 foot voltage of quasi- power supply V10 reaches 2.5V voltage references, cathode (2 foot) to anode (3 foot) is connected.
As depicted in figs. 1 and 2, the overvoltage protection mechanism in DC switch circuit, under-voltage protection mechanism, reverse connecting protection machine
Structure, overcurrent protection mechanism, the working mechanism of short current protective mechanism and control method are as follows：
When the DC input voitage of DC switch circuit is gradually increased from rated value, through the electricity of the 6th resistance R6 and the 11st
Reference voltage after resistance R11 partial pressures is sent to 1 foot of the 5th voltage reference power supply V5, when 1 foot pair 3 of the 5th voltage reference power supply V5
When foot voltage value reaches 2.5V voltage references, 2 feet of the 5th voltage reference power supply V5 are connected with 3 feet, the 5th voltage reference power supply
The 2 foot current potentials of V5 are pulled low, and the 1 foot current potential of the 4th voltage reference power supply V4 is also pulled low, therefore the 1 of the 4th voltage reference power supply V4
3 foot voltage of foot pair is less than 2.5V voltage references, and 2 feet of the 4th voltage reference power supply V4 and 3 feet is caused to turn off, then, the 4th electricity
The 2 foot current potentials of pressure reference power supply V4 are elevated, and 3 feet of the second photoelectrical coupler E2 and 4 feet turn off, and drive signal disappears, and first
The Q1 shutdowns of MOS power switch tubes, overvoltage protection action.The overvoltage protection value of DC switch circuit is configured by formula (1).
When the DC input voitage of DC switch circuit is continuously decreased from rated value, through the electricity of the 7th resistance R7 and the 12nd
Reference voltage after resistance R12 partial pressures is sent to 1 foot of the 4th voltage reference power supply V4, when 1 foot pair 3 of the 4th voltage reference power supply V4
When foot voltage value is less than 2.5V voltage references, 2 feet of the 4th voltage reference power supply V4 and 3 feet turn off, the 4th voltage reference power supply
The 2 foot current potentials of V4 are elevated, and 3 feet of the second photoelectrical coupler E2 and 4 feet turn off, and drive signal disappears, the first MOS power switch
Pipe Q1 shutdowns, under-voltage protection action.The under-voltage protection value of DC switch circuit is configured by formula (2).
When the direct current of DC switch circuit input positive and negative anodes are reversed, the 6th diode V6 bears reverse voltage, auxiliary electricity
Source mechanism does not work, and VCC1 is 0 to GND1 current potentials, and drive signal disappears, the first MOS power switch tubes Q1 shutdowns, reverse connecting protection
Action.The overvoltage protection ability of DC switch circuit depends on the 6th diode V6.
When DC switch circuit normal work and when unprotect phenomenon, flow through the electric current of DC switch circuit output end with
The variation of load and change.When the load of DC switch circuit is continuously increased, the first linear hall sensor T1 samples direct current
The output current of switching circuit, and current signal is converted into voltage signal, when the voltage signal passes through rear class sampled signal tune
1 foot of the tenth voltage reference power supply V10 is sent to after reason processing of circuit, when 1 foot pair, the 3 foot voltage of the tenth voltage reference power supply V10
When value reaches 2.5V voltage references, 2 feet of the tenth voltage reference power supply V10 are connected with 3 feet, and the 2 of the tenth voltage reference power supply V10
Foot current potential is pulled low, and the 1 foot current potential of the second photoelectrical coupler E2 is pulled low, and 3 feet of the second photoelectrical coupler E2 and 4 feet is caused to close
Disconnected, drive signal disappears, the first MOS power switch tubes Q1 shutdowns, overcurrent protection action.When overcurrent protection acts, overcurrent is set
Protection value is Io, overcurrent protection when the first linear hall sensor T1 3 foot pair, 2 foot output voltage be U1, downsampling factor G,
Then there is Io=GU1.The ratio and the 21st resistance of the 16th resistance R16 and the 17th resistance R17 in overcurrent protection mechanism
R21 is identical as the ratio of the 19th resistance R19, i.e. the 16th resistance R16, the 17th resistance R17, the 21st resistance R21,
19 resistance R19, the first operational amplifier N1 form differential amplifier circuit.The overcurrent protection value of DC switch circuit presses formula (3)
It is configured.
When DC switch circuit normal work and when unprotect phenomenon, 2 feet and 3 feet of the first MOS power switch tubes Q1 it
Between be connected, the electric current flowed through changes with the variation of load, the conducting between 2 foot pair, 3 foot of the first MOS power switch tubes Q1
Pressure drop changes with the variation of electric current.When DC switch circuit output short-circuit, the 2 of the first MOS power switch tubes Q1 are flowed through
Foot, 3 feet electric current sharply increase, the conduction voltage drop between 2 foot pair, 3 foot of the first MOS power switch tubes Q1 sharply increases, first
The current potential of 2 foot pair, 3 foot of MOS power switch tubes Q1 sharply increases, and the 1 foot current potential of tertiary voltage reference power supply V3 is elevated, when
When 1 foot pair, the 3 foot voltage value of tertiary voltage reference power supply V3 reaches 2.5V voltage references, 2 feet of tertiary voltage reference power supply V3
It being connected with 3 feet, the 2 foot current potentials of the first photoelectrical coupler E1 are pulled low, and 3 feet of the first photoelectrical coupler E1 are connected with 4 feet, and first
The 3 foot current potentials of photoelectrical coupler E1 are elevated, and the 2 foot current potentials of the second photoelectrical coupler E2 are elevated, and cause the second photoelectric coupling
3 feet of device E2 and 4 feet turn off, and drive signal disappears, the first MOS power switch tubes Q1 shutdowns, short-circuit protection action.Short-circuit protection
When action, set short circuit current protection value as the conduction impedance of I1, the first MOS power switch tubes Q1 be Ron, the first diode V1
Conduction voltage drop is U2.The short circuit current protection value of DC switch circuit is configured by formula (4).
The key point of the present invention is the provision of a kind of DC switch circuit, realizes that DC switch circuit is defeated through the invention
Enter the Functional Designs such as overvoltage, input undervoltage, input reverse-connection, output overcurrent and output short-circuit, and is the long-range of DC switch circuit
Control and intelligent control provide may.The DC switch circuit includes mainly overvoltage protection mechanism, under-voltage protection mechanism, anti-
Connect protection mechanism, overcurrent protection mechanism, short current protective mechanism, control mechanism, accessory power supply mechanism, driving mechanism and switching on and shutting down
Structure.The overvoltage protection mechanism is used for the input overvoltage protection of DC switch circuit, and the under-voltage protection mechanism is opened for direct current
The input undervoltage on powered-down road is protected, and input reverse-connection of the reverse connecting protection mechanism for DC switch circuit is protected, the overcurrent
Output overcurrent of the protection mechanism for DC switch circuit is protected, and the short current protective mechanism is used for the output of DC switch circuit
Short-circuit protection, the control mechanism is for the work start-up and shut-down control of DC switch circuit, remote control function extension and intelligence control
Function Extension processed, the accessory power supply mechanism are used for the overvoltage protection mechanism, the under-voltage protection machine of DC switch circuit
Structure, the reverse connecting protection mechanism, the overcurrent protection mechanism, the short current protective mechanism and driving mechanism power supply, it is described
The switching mechanism break-make of the driving mechanism for DC switch circuit controls, and the switching mechanism is used to be DC switch circuit
Break-make between input anode and output cathode provides channel.
Compared with prior art, the present invention effectively increases the environmental suitability of DC switch circuit, makes it using work
Condition is complicated, and the especially larger occasion of vibratory impulse intensity still is able to work normally, and advantageously reduces rear class equipment application risk,
Improve security of system；Perfect defencive function is provided, the response speed and control accuracy of defencive function is improved, passes through letter
Single hardware circuit adjustment can upgrade protection circuit, eliminate software sampling and controlling unit, reduce circuit and set
The complexity of meter and control method, has compressed development cost；Expansion interface is controlled provided with outside, is the remote of DC switch circuit
Process control and intelligent control function extension provide possibility；The standby damage of DC switch circuit is reduced by standby sleep mode
Consumption；It got rid of the mechanical contact of Traditional DC switch, eliminated switching arc, eliminated arc quenching system, effectively reduced direct current and open
The volume weight on powered-down road improves the service life and reliability of DC switch circuit.
Above content is only to structure of the invention example and explanation, affiliated those skilled in the art couple
Described specific embodiment does various modifications or additions or substitutes by a similar method, without departing from invention
Structure or beyond the scope defined by this claim, is within the scope of protection of the invention.
Claims (8)
1. a kind of DC switch circuit, which is characterized in that including direct-flow input end, overvoltage protection mechanism, under-voltage protection mechanism, anti-
Connect protection mechanism, overcurrent protection mechanism, short current protective mechanism, control mechanism, accessory power supply mechanism, driving mechanism, switching mechanism
It is constituted with DC output end；The direct-flow input end and overvoltage protection mechanism, under-voltage protection mechanism, reverse connecting protection mechanism and switch
Mechanism is electrically connected, and the reverse connecting protection mechanism is electrically connected with accessory power supply mechanism, the control mechanism and accessory power supply mechanism electricity
Connection, the accessory power supply mechanism are electrically connected with short current protective mechanism, overcurrent protection mechanism, the short current protective mechanism and driving
Mechanism is electrically connected, and the driving mechanism is electrically connected with switching mechanism, the switching mechanism and DC output end, short current protective mechanism
It is electrically connected with overcurrent protection mechanism, the under-voltage protection mechanism is connected electrically between driving mechanism and short current protective mechanism, described
Overcurrent protection mechanism is electrically connected with driving mechanism；
The first Wiring port P1, the second Wiring port P2, third Wiring port P3 and are additionally provided on the DC switch circuit
Four Wiring port P4, the first Wiring port P1, the second Wiring port P2, third Wiring port P3 and the 4th Wiring port P4 are straight
Switching circuit external interface is flowed, DC switch circuit external cabling is used for.
2. a kind of DC switch circuit according to claim 1, which is characterized in that the overvoltage protection mechanism is used for direct current
The input overvoltage protection of switching circuit, input undervoltage of the under-voltage protection mechanism for DC switch circuit is protected, described anti-
The input reverse-connection that protection mechanism is connect for DC switch circuit is protected, and the overcurrent protection mechanism is defeated for DC switch circuit
Go out overcurrent protection, the short current protective mechanism is used for the output short circuit protection of DC switch circuit；
The control mechanism is for the work start-up and shut-down control of DC switch circuit, remote control function extension and intelligent control function
Extension, the accessory power supply mechanism are used for overvoltage protection mechanism, under-voltage protection mechanism, the reverse connecting protection machine of DC switch circuit
The power supply of structure, overcurrent protection mechanism, short current protective mechanism and driving mechanism, the driving mechanism control dc switch for break-make
The switching mechanism of circuit, the switching mechanism are used to provide for the break-make that DC switch circuit inputs between anode and output cathode
Channel.
3. a kind of DC switch circuit according to claim 1, which is characterized in that the overvoltage protection mechanism includes
First capacitance C1, the 6th resistance R6, eleventh resistor R11, third capacitance C3, the 5th voltage reference power supply V5, the 4th voltage base
Quasi- power supply V4, the tenth resistance R10 and the second photoelectrical coupler E2；Wherein, the 6th resistance R6 and eleventh resistor R11 goes here and there
Connection, the first capacitance C1 is in parallel with concatenated 6th resistance R6 and eleventh resistor R11, the eleventh resistor R11 and the
Three capacitance C3 are in parallel, and the 5th voltage reference power supply V5 is connected electrically between the 6th resistance R6 and eleventh resistor R11, described
4th voltage reference power supply V4 connects with the 5th voltage reference power supply V5.
4. a kind of DC switch circuit according to claim 1, which is characterized in that the under-voltage protection mechanism includes first
Capacitance C1, the 7th resistance R7, twelfth resistor R12, the 4th capacitance C4, the 4th voltage reference power supply V4, the tenth resistance R10 and
Two photoelectrical coupler E2；
The 7th resistance R7 and twelfth resistor R12 series connection, the electricity of the first capacitance C1 and concatenated 7th resistance R7 and the 12nd
It is in parallel to hinder R12；It is also parallel with the 4th capacitance C4 on the twelfth resistor R12, the 4th is also parallel on the 4th capacitance C4
Reference power supply V4, the 4th reference power supply V4 connect with the second photoelectrical coupler E2, the second photoelectrical coupler E2 and
Ten resistance R10 series connection, the tenth resistance R10 are electrically connected with VCC2；
The reverse connecting protection mechanism is the 6th diode V6, and the 6th diode V6 connects with the first capacitance C1.
5. a kind of DC switch circuit according to claim 1, which is characterized in that the overcurrent protection mechanism includes the tenth
Six capacitance C16, the first linear hall sensor T1, the 13rd capacitance C13, the 17th resistance R17, the 19th resistance R19, the tenth
Six resistance R16, the 21st resistance R21, the first operational amplifier N1, the 15th capacitance C15, the 14th capacitance C14, the 18th
Resistance R18, the 20th resistance R20, the 17th capacitance C17, the tenth voltage reference power supply V10, the tenth resistance R10 and the second photoelectricity
Coupler E2；
The 16th capacitance C16 is in parallel with the first linear hall sensor T1, and power supply is additionally provided on the overcurrent protection mechanism
End VCC2 and ground terminal GND2, the power end VCC2 are connected to the VCC interfaces of the first linear hall sensor T1, the ground connection
End GND2 is connected on the GND interfaces of the first linear hall sensor T1；The OUT interfaces of the first linear hall sensor T1
It connects with the 17th resistance R17, the 13rd capacitance C13 is connected on the OUT interfaces and of the first linear hall sensor T1
Between 17 resistance R17, the 13rd capacitance C13 other ends are connect with ground terminal GND2；
The 17th resistance R17 is connected to the in-phase input end of the first operational amplifier N1, the 17th resistance R17 and
The 16th resistance R16, the 16th resistance R16 other ends are also electrically connected between the in-phase input end of one operational amplifier N1
It is connected on ground terminal GND2, the inverting input of the first operational amplifier N1 is also electrically connected with the 19th resistance R19, institute
It states the 19th resistance R19 other ends to connect with ground terminal with GND2, also be electrically connected on the output end of the first operational amplifier N1
It is connected to the 18th resistance R18, the 18th resistance R18 connects with the 20th resistance R20, and the 20th resistance R20 is another
End is connected on ground terminal GND2, and the 17th capacitance C17, the 17th capacitance are also parallel on the 20th resistance R20
The tenth voltage reference power supply V10 is also parallel on C17；The tenth resistance R10 and the second photoelectrical coupler E2 series connection, described the
Ten voltage reference power supply V10 are connected electrically between the tenth resistance R10 and the second photoelectrical coupler E2；
It is parallel with the 21st resistance R21 on the inverting input and output end of the first operational amplifier N1, described first
The 15th capacitance C15 and the 14th capacitance C14, the connection of the one end the 15th capacitance C15 are also parallel on operational amplifier N1
There are VCC2, the 15th capacitance C15 other ends to be connected with ground terminal GND2.
6. a kind of DC switch circuit according to claim 1, which is characterized in that the short current protective mechanism includes second
Resistance R2, the 8th resistance R8, the 9th resistance R9, the first diode V1, the second capacitance C2, tertiary voltage reference power supply V3, first
Photoelectrical coupler E1, first resistor R1, the 5th resistance R5, the tenth resistance R10 and the second photoelectrical coupler E2；
The first diode V1 and the 8th resistance R8, the 9th resistance R9 are sequentially connected in series, the electricity of the first diode V1 and the 8th
It is also electrically connected on second resistance R2, the 9th resistance R9 between resistance R8 and is also parallel with the second capacitance C2, second capacitance
C2 is in parallel with tertiary voltage reference power supply V3, and the tertiary voltage reference power supply V3 is electrically connected with the first photoelectrical coupler E1, institute
It stating and is also electrically connected with first resistor R1 on the first photoelectrical coupler E1, the first resistor R1 is electrically connected with VCC1, and described first
It is also electrically connected with the 5th resistance R5 on photoelectrical coupler E1, the second photoelectricity coupling is also electrically connected on the first photoelectrical coupler E1
Clutch E2, the second photoelectrical coupler E2 are electrically connected with the tenth resistance R10.
7. a kind of DC switch circuit according to claim 1, which is characterized in that the control mechanism is first switch
K1；The accessory power supply mechanism includes the 9th capacitance C9, the 6th diode V6, the 7th voltage-stabiliser tube V7, the tenth capacitance C10, the tenth
One capacitance C11, the 9th voltage-stabiliser tube V9, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 12nd capacitance
C12, the second triode Q2, the second modular power source U2, the 7th capacitance C7, the 8th capacitance C8, the first voltage-stablizer U1, the 8th Schottky
Diode V8, the first inductance L1, the 5th capacitance C5 and the 6th capacitance C6；
The 9th capacitance C9 is sequentially connected in series with the 6th diode V6 and the 7th voltage-stabiliser tube V7, on the 7th voltage-stabiliser tube V7 also simultaneously
Be associated with the tenth capacitance C10, be also parallel with the 11st capacitance C11 on the tenth capacitance C10, the 11st capacitance C11 also with
Concatenated first switch K1 and the 9th voltage-stabiliser tube V9 are in parallel, and the 9th voltage-stabiliser tube V9 connects with the 14th resistance R14, and described the
14 resistance R14 connect with the 12nd capacitance C12 in parallel and the 15th resistance R15；The second triode Q2 be connected to
14th resistance R14 between the 12nd capacitance C12 in parallel and the 15th resistance R15, the second triode Q2 and the tenth
Three resistance R13 are electrically connected, and the second modular power source U2, the second modular power source U2 is also parallel on the thirteenth resistor R13
Rear end is parallel with the 7th capacitance C7, and the rear ends the 7th capacitance C7 are parallel with the 8th capacitance C8, the one end the 8th capacitance C8 electricity
It is connected with VCC1, the 8th capacitance C8 other ends are electrically connected with GND1；
+ IN the mouths of the second modular power source U2 are also connected with the Vin mouths of the first modular power source U1, the first modular power source U1
GND mouths ground connection, the Vo mouths of the first modular power source U1 are connected with the 8th Schottky diode V8, the first inductance L1 mono-
End is connected on the FB mouths of the first modular power source U1, and the first inductance L1 other ends are connected to Vo mouthfuls and two pole of the 8th Schottky
Between pipe V8, the 5th capacitance C5, the 5th electricity are also parallel on concatenated first inductance L1 and the 8th Schottky diode V8
Hold and be also parallel with the 6th capacitance C6 on C5, the one end the 6th capacitance C6 is connected with VCC2, the 6th capacitance C6 other ends with
4th Wiring port P4 electrical connections；
The input of the second modular power source U2 is isolated with output.
8. a kind of DC switch circuit according to claim 1, which is characterized in that the driving mechanism includes the second photoelectricity
Coupler E2,3rd resistor R3, the 4th resistance R4 and the second voltage-stabiliser tube V2；The second photoelectrical coupler E2 and 3rd resistor R3
Electrical connection, the 3rd resistor R3 connect with the second voltage-stabiliser tube V2, and the second voltage-stabiliser tube V2 is in parallel with the 4th resistance R4；
The switching mechanism is the first MOS power switch tube Q1, and the 4th resistance R4 and the first MOS power switch tubes Q1 are simultaneously
Connection, described one end first MOS power switch tube Q1 are electrically connected with GND1, and the GND1 is electrically connected with third Wiring port P3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810548080.2A CN108809282B (en) | 2018-05-31 | 2018-05-31 | Direct current switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810548080.2A CN108809282B (en) | 2018-05-31 | 2018-05-31 | Direct current switch circuit |
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| CN108809282B CN108809282B (en) | 2022-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114137886A (en) * | 2021-12-08 | 2022-03-04 | 杭州涂鸦信息技术有限公司 | Door magnet monitoring circuit, door magnet monitoring device and installation method thereof |
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