CN107689670A - A kind of control circuit of main power supply switching switch - Google Patents
A kind of control circuit of main power supply switching switch Download PDFInfo
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- CN107689670A CN107689670A CN201711058832.9A CN201711058832A CN107689670A CN 107689670 A CN107689670 A CN 107689670A CN 201711058832 A CN201711058832 A CN 201711058832A CN 107689670 A CN107689670 A CN 107689670A
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- 238000002955 isolation Methods 0.000 claims abstract description 42
- 230000000087 stabilizing effect Effects 0.000 claims description 27
- 230000005611 electricity Effects 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 20
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- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 230000011664 signaling Effects 0.000 claims description 12
- 239000011324 bead Substances 0.000 claims description 7
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000001629 suppression Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
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- 230000006378 damage Effects 0.000 description 5
- 230000000452 restraining effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
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- 230000001052 transient effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of control circuit of main power supply switching switch.Beneficial effects of the present invention by the input of isolation circuit by being coupled to outside collection point, output end is coupled to main control chip, analog signal is subjected to isolation and amplifier to main control chip, outside collection point output voltage signal is to isolation circuit, voltage signal is output to main control chip after isolation circuit progress electrical isolation, realize the electrical isolation between the voltage signal of input and the voltage signal of output end, avoid the situation for causing main control chip to be damaged with late-class circuit extremely because of outside collection point, avoid and disturbed caused by electrical connection, improve the stability of circuit, extend the service life of circuit.
Description
Technical field
The present invention relates to electric field, more particularly to a kind of control circuit of main power supply switching switch.
Background technology
It in order to ensure the reliability of power supply, should should regard negative at least provided with two independent current sources, particular number in many occasions
Depending on lotus size and local grid conditions.Two-way independent current source is essentially while powered, standby each other, also needs if necessary in addition
Install emergency stand-by power generator group.
The voltage sampling circuit of existing switching switch is connected to outside live wire collection point and outside zero line collection point, will connect
The voltage signal received is output to main control chip after resistance capacitance carries out current limliting and sampled, and signal is not isolated,
Poor anti jamming capability, security is low, and circuit stability is low, fragile main control chip, in order to ensure the safe and reliable of circuit, simultaneously
The stability of circuit is improved, it is necessary to which voltage signal is isolated, reduces the generation of potential safety hazard.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the invention to provide a kind of control of main power supply switching switch
Circuit, the voltage of isolation collection collection point is depressured by sample circuit and is transported to switching switch governor circuit, switching switch master
Control circuit and active and standby power supply is switched according to the voltage signal output dip switch signal control relay drive circuit of collection point.
To achieve the above object, the invention provides following technical scheme：A kind of control electricity of main power supply switching switch
Road, include：
Voltage sampling circuit, outside collection point is coupled to, for collection voltages and output voltage signal；
Switching switch governor circuit, the switching switch governor circuit includes main control chip and respective peripheral circuit, described
Main control chip is coupled to voltage sampling circuit, receiving voltage signal and output switch switching signal, is exported according to each circuit state
Indication signal；
Relay drive circuit, the relay drive circuit are coupled to main control chip and outside main power supply, receive master
Control the outside main power supply of switch switching signal switching of chip output；
Power circuit, include input and output end, input is coupled to external power source, and output end is coupled to voltage and adopted
Sample circuit, switching switch governor circuit and relay drive circuit, to voltage sampling circuit, switching switch governor circuit and relay
Device drive circuitry；
Indicator light circuit, the indicator light circuit are coupled to main control chip, receive the indication signal of main control chip, control phase
The indicator lamp answered lights；
Button circuit, the button circuit are coupled to main control chip, receive outside click signal and are output to main control chip.
The voltage sampling circuit has：Isolation circuit, the isolation circuit have input and output end, the isolation
The input of circuit is coupled to outside collection point, and the output end of the isolation circuit is coupled to main control chip, receives outside gather
The voltage signal of point, and it is output to main control chip after voltage signal is isolated.
As a further improvement on the present invention, the relay drive circuit includes zero line controlling switch K1 and live wire controls
K2 is switched, the zero line controlling switch K1 and outside main power supply zero line couple, the live wire controlling switch K2 and outside master
The live wire coupling of stand-by power source, the zero line controlling switch K1 and live wire controlling switch K2 also couple with main control chip, and receive
The outside main power supply of switch switching signal control switching of main control chip output.
As a further improvement on the present invention, the relay drive circuit is described also including active-standby switch master switch K3
Active-standby switch master switch K3 and zero line controlling switch K1 and live wire controlling switch K2 is coupled, and receives the active and standby electricity in outside of its output
Source, the active-standby switch master switch K3 also couple with main control chip, and receive the switch switching signal control of main control chip output
The outside main power supply output of switching disconnects.
As a further improvement on the present invention, in addition to resistance-capacitance circuit, the resistance-capacitance circuit include the resistance being serially connected
And electric capacity, the other end of the electric capacity relative resistance is coupled to after active-standby switch master switch K3 also to be coupled with outside electrical appliance, institute
State resistance relative capacity the other end be coupled to after electrical appliance selecting switch also with outside electrical appliance couple.
As a further improvement on the present invention, the isolation circuit includes voltage transformer CT1, current-limiting resistance and sampling
Resistance, the voltage transformer CT1 have input and output end, and the input of the voltage transformer CT1 is coupled to current limliting
Outside collection point is coupled to after resistance, main control chip is coupled to after the output end coupling sample resistance of the voltage transformer CT1,
The voltage transformer CT1 by the signal for receiving collection point and is output to main control chip after isolation.
As a further improvement on the present invention, the power circuit includes：Suppress cross talk circuit, mu balanced circuit, transformation
Device and rectification circuit, the rectification circuit include input, output end and common port, and the primary side of the transformer is coupled to
Outside main power supply, primary side are coupled to the input of rectification circuit, and the output end of the rectification circuit is coupled to suppression crosstalk
Circuit and mu balanced circuit.
As a further improvement on the present invention, the mu balanced circuit includes the first mu balanced circuit, the second mu balanced circuit, institute
State the first mu balanced circuit and the second mu balanced circuit is in parallel, the input of first mu balanced circuit and the second mu balanced circuit is coupled to
The output end of rectification circuit, the output supply voltage series of the output end of first mu balanced circuit and the second mu balanced circuit are mutual not
It is identical；Second mu balanced circuit includes primary mu balanced circuit and secondary mu balanced circuit, the input of the primary mu balanced circuit
End is coupled to the output end of rectification circuit, and the output end of the primary mu balanced circuit is coupled to the input of secondary mu balanced circuit,
The primary mu balanced circuit and the output supply voltage series of the output end of secondary mu balanced circuit are different.
As a further improvement on the present invention, station acquisition circuit is also included, the station acquisition circuit has position
Optocoupler, the station acquisition circuit are coupled to the output end of each suppression cross talk circuit, receiving position signal, and position signalling is defeated
Go out to position optocoupler, position optocoupler outgoing position signal, the output end of position optocoupler is coupled with RC filter circuits, by position signalling
Main control chip is output to after filtering.
As a further improvement on the present invention, fire-fighting circuit is also included, the fire-fighting circuit is coupled to outside fire-fighting hair
Send a little and main control chip, the fire-fighting circuit have fire-fighting optocoupler, the fire-fighting optocoupler has input and output end, described
The input of fire-fighting optocoupler is coupled with piezo-resistance VR1 and current-limiting resistance R41, the fire-fighting circuit receives outside fire-fighting and sent
The fire-fighting signal that point is sent is output to fire-fighting optocoupler, fire-fighting optocoupler output fire-fighting signal, and the output end of fire-fighting optocoupler is coupled with RC
Main control chip is coupled to after magnetic bead CZ13 is coupled with after filter circuit, main control chip is output to after fire-fighting signal is filtered.
As a further improvement on the present invention, in addition to LCD display circuit, the LCD display circuit have LCD chip and
Triode Q2, the LCD chip have backlight electric power positive pole pin and backlight electric power negative pin, the backlight of the LCD chip
Power cathode pin is grounded, and the backlight electric power positive pole pin of the LCD chip is coupled to triode Q2 colelctor electrode, three pole
Pipe Q2 emitter stage is coupled to power supply, and the base stage of the triode Q2 is coupled to main control chip after being coupled with resistance.
Beneficial effects of the present invention, by the way that the input of isolation circuit is coupled into outside collection point, output end is coupled to
Main control chip, analog signal is subjected to isolation and amplifier to main control chip, outside collection point output voltage signal to isolation circuit, every
Voltage signal is output to main control chip from after circuit progress electrical isolation, realizes the voltage signal of input and the electricity of output end
The electrical isolation between signal is pressed, avoids the situation for causing main control chip to be damaged with late-class circuit extremely because of outside collection point,
Avoid and disturbed caused by electrical connection, improved the stability of circuit；Power circuit gives the circuit power supply of switching switch internal, electricity
Sample circuit output voltage signal is pressed main control chip output dip switch signal to relay drive circuit, to be cut to main control chip
Change outside main power supply.Setting indicator light circuit to receive the indication signal of main control chip controls corresponding indicator lamp to light, and prompts
User currently switches the state of switch, and the click signal that button circuit receives external user is output to main control chip, manually
Regulation, control switching switch, realizes man-machine interaction, easy to use.
Brief description of the drawings
Fig. 1 is the circuit diagram of voltage sampling circuit；
The circuit diagram of potential circuit on the basis of Fig. 2；
Fig. 3 is the circuit diagram of switching switch governor circuit；
Fig. 4 is the circuit diagram of breaker drive circuit；
Fig. 5 is the circuit diagram of power circuit；
Fig. 6 is the circuit diagram of station acquisition circuit；
Fig. 7 is the circuit diagram of fire-fighting circuit；
Fig. 8 is the circuit diagram of LCD display circuit；
Fig. 9 is the circuit diagram of indicator light circuit；
Figure 10 is the circuit diagram of button.
Embodiment
The present invention is described in further detail below in conjunction with the embodiment given by accompanying drawing.
Shown in reference picture 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and Figure 10, the present embodiment it is a kind of active and standby
The control circuit of power change-over switch, includes：
Voltage sampling circuit 1, outside collection point is coupled to, for collection voltages and output voltage signal；
Switching switch governor circuit 2, the switching switch governor circuit 2 include main control chip 21 and respective peripheral circuit,
The main control chip 21 is coupled to voltage sampling circuit 1, receiving voltage signal and output switch switching signal, according to each circuit shape
State output indication signal；
Relay drive circuit 3, the relay drive circuit 3 are coupled to main control chip 21 and outside main power supply, connect
Receive the outside main power supply of switch switching signal switching that main control chip 21 exports；
Power circuit 4, include input and output end, input is coupled to external power source, and output end is coupled to voltage
Sample circuit 1, switching switch governor circuit 2 and relay drive circuit 3, to voltage sampling circuit 1, switching switch governor circuit
2 and relay drive circuit 3 power；
Indicator light circuit 8, the indicator light circuit 8 are coupled to main control chip 21, receive the indication signal of main control chip, control
Corresponding indicator lamp is made to light；
Button circuit 9, the button circuit are coupled to main control chip 21, receive outside click signal and are output to master control core
Piece 21.
The voltage sampling circuit 1 has：Isolation circuit 11, the isolation circuit 11 have input and output end, institute
The input for stating isolation circuit 11 is coupled to outside collection point, and the output end of the isolation circuit 11 is coupled to main control chip 21,
The voltage signal of outside collection point is received, and main control chip 21 is output to after voltage signal is isolated.Using process of the present invention
In, power circuit gives the circuit power supply of switching switch internal, the output voltage signal of voltage sampling circuit 1 to main control chip 21, master control
The output dip switch signal of chip 21 switches outside main power supply to relay drive circuit 3.Indicator light circuit 8 is set to receive
The indication signal of main control chip 21 controls corresponding indicator lamp to light, and prompts user currently to switch the state of switch, button circuit
The click signal for receiving external user is output to main control chip 21, manually adjusts, and control switching switch, realizes man-machine friendship
Mutually, it is easy to use.Existing voltage sampling circuit 1 will not carry out electrical isolation between outside collection point and main control chip 21, deposit
In potential safety hazard, isolation circuit 11 of the invention is simple, outside collection point output voltage signal to isolation circuit 11, isolation circuit
Voltage signal is output to main control chip 21 after 11 progress electrical isolations, realizes the voltage signal of input and the voltage of output end
Electrical isolation between signal, the situation for causing main control chip 21 to be damaged with late-class circuit extremely because of outside collection point is avoided,
Avoid and disturbed caused by electrical connection, improved the stability of circuit, extended the service life of circuit.
As a kind of improved embodiment, the relay drive circuit 3 includes zero line controlling switch K1 and fire
The zero line of line control switch K2, the zero line controlling switch K1 and outside main power supply couples, the live wire controlling switch K2 with
The live wire coupling of outside main power supply, the zero line controlling switch K1 and live wire controlling switch K2 also with the coupling of main control chip 21
Connect, and receive the outside main power supply of switch switching signal control switching of the output of main control chip 21.In using process of the present invention,
The zero line controlling switch K1 and live wire controlling switch K2 can be the selective relay of DPDT, by outside main power supply
Live wire is accessed on same live wire controlling switch K2, and the zero line of outside main power supply is accessed in same zero line controlling switch
On K1, by zero line controlling switch K1 and live wire controlling switch K2 isolation set, zero line controlling switch K1 control main circuit zero line or
Standby circuit zero line, live wire controlling switch K2 control main circuit live wires or standby circuit live wire, realize the remote of power line, and live wire
Controlling switch K2 only controls the live wire break-make of outside main power supply, and zero line controlling switch K1 only controls the zero line of outside main power supply
Break-make, this avoid relay to produce electric arc, outside active and standby compared to being accessed with an existing dpdt relay simultaneously
The live wire and zero line of power supply, reduce the potential safety hazard of electric arc initiation.And more easily control zero by main control chip 21
Line control switch K1 and live wire controlling switch K2.Employ the selective relay of two DPDTs, such a DPDT
Selective relay it is normally opened when, the contact of one of armature contact be connected with main power source zero line, and another armature contacts tactile
Point connects sky, when the selective relay adhesive, is touched originally with what the armature of the contact of main power source zero line connection contacted now
Point connects sky, and the contact of another armature contact connects stand-by power source zero line, and the selective relay of another DPDT uses identical
Connected mode is connected with main power source live wire and stand-by power source live wire, two armature of such zero line controlling switch K1 selective relay
Output will become one of them and connect space-time another connects main power source zero line or one of them connects stand-by power source zero line another connects
Sky, the output of two armature of live wire controlling switch K2 selective relay will become one of them and connect space-time another meets master
Another connects sky during power firestreak or during one of stand-by power source live wire, such way of output can control main power supply
The outside main power supply of switching output, and switched compared to large power triode, large power triode heating is serious, and cost
Height, price, Control is convenient, and principle is simple, and price is low.
As a kind of improved embodiment, the relay drive circuit 3 also includes active-standby switch master switch K3,
The active-standby switch master switch K3 and zero line controlling switch K1 and live wire controlling switch K2 is coupled, and the outside for receiving its output is active and standby
Power supply, the active-standby switch master switch K3 also couple with main control chip 21, and receive the switch switching letter of the output of main control chip 21
Number outside main power supply output of control switching disconnects.In using process of the present invention, the active-standby switch master switch K3 is double
The switching relay of dpdt double-pole double-throw (DPDT), active-standby switch master switch K3 is set, improves Switching power efficiency, while when there is emergency case
Main control chip 21 can control active-standby switch master switch K3 in time, simple efficient, without controlling zero line controlling switch K1 and live wire
Controlling switch K2, improves control efficiency.
As a kind of improved embodiment, in addition to resistance-capacitance circuit 31, the resistance-capacitance circuit 31 includes mutually string
The resistance and electric capacity of connection, the other end of the electric capacity relative resistance be coupled to after active-standby switch master switch K3 also with outside electrical appliance
Coupling, the other end of the resistance relative capacity is coupled to after electrical appliance selecting switch also to be coupled with outside electrical appliance.Using
In process of the present invention, master is connected on when the electrical appliance for the easy generation peak voltage that electrical appliance is motor etc, such as by motor
After on power supply or stand-by power source, when being inverted after motor stalling at once, reverse voltage is had due to coil both ends, so motor
Both ends have the generation of spike high pressure, and now the filtering characteristic of electric capacity, can be filtered spike high pressure, while resistance can enter
Row current limliting, prevents high current to be directly entered motor, and so as to cause to damage, this can be absorbed by then passing through above-mentioned resistance-capacitance circuit 31
Spike high pressure, with protection circuit and motor.
As a kind of improved embodiment, the isolation circuit 11 includes voltage transformer CT1, current-limiting resistance
111 and sample resistance 112, the voltage transformer CT1 there is input and output end, the input of the voltage transformer CT1
End is coupled to outside collection point, the output end coupling sample resistance of the voltage transformer CT1 after being coupled to current-limiting resistance 111
Main control chip 21 is coupled to after 112, the voltage transformer CT1 by the signal for receiving collection point and is output to master control core after isolation
Piece 21.In using process of the present invention, voltage transformer CT1 can be isolated analog signal, and current-limiting resistance 111 is coupled
Between collection point and voltage transformer CT1 input, limitation is output to voltage transformer CT1 electric current, improves circuit
Stability, sample resistance 112 is coupled in voltage transformer CT1 output end, can be with by the size for adjusting sample resistance 112
The size of the voltage signal of voltage transformer CT1 outputs is adjusted, voltage signal is adjusted in the tolerance range of main control chip 21,
The voltage signal of input and the voltage signal of output end are subjected to electrical isolation by voltage transformer CT1, it is safe and efficient.It is existing
Voltage sampling circuit 1 electrical isolation will not be carried out between outside collection point and main control chip 21, potential safety hazard be present, the present invention
Isolation circuit it is simple, using effect is good, and can be according to the ability to bear of main control chip 21 by adjusting sample resistance 32
Size and then the size for adjusting output voltage.And can be according to the ability to bear of main control chip 21 by adjusting sample resistance 112
Size and then the size for adjusting output voltage.During using during a resistance as current-limiting resistance 111 or sample resistance 112, it can go out
Resistance heat is high, and radiate slow situation, combines increase radiating using multiple resistance, improves circuit stability.Magnetic bead is set
CZ10 and magnetic bead CZ17 carry out anti-Radio frequency interference, compared with the circuit for being not provided with magnetic bead, improve the stability of circuit；By setting
Holding fuse FUSE1, protective separation circuit 11 and main control chip 21 are not injured by overcurrent, avoid and change component or whole
Switch the situation of switch, reduce use cost, be not provided with during fuse FUSE1 isolation circuit 1 and main control chip 21 easily by excessively electric
Stream damage, causes damage to user, influences user's use；By setting piezo-resistance VR4, protection is because of electric power supply system
Instantaneous voltage mutation may be to the injury of circuit, and when high pressure is come then, piezo-resistance VR4 resistance reduces and gives electric current
Shunting, prevent from, by excessive instantaneous voltage damage containment circuit 11 or main control chip 21, protecting the electronic building brick of sensitivity.If
Holding fuse FUSE1 and piezo-resistance VR4 protects overcurrent and overvoltage to isolation circuit 11 and the shadow of main control chip 21 simultaneously
Ring, using effect is good.By setting electric capacity C12 to filter out the burr in voltage transformer CT output voltages, with being not provided with electric capacity
C12 circuit is compared, and improves the stability of output voltage, improves the accuracy of voltage acquisition；Set current-limiting resistance R25 will
The electric current of output carries out current limliting, because the ability to bear of the pin of main control chip 21 is relatively low, sets current-limiting resistance R25 protection master control cores
The normal use of piece 21, compared with being not provided with current-limiting resistance R25 circuit, the stability of main control chip 21 is improved, extends master control core
The service life of piece 21；By the way that voltage transformer CT1 benchmark pin is coupled into reference voltage circuit 12, there is provided stable benchmark
Voltage, than directly using the reference voltage of main control chip 21 more accurate；Voltage transformer CT1 output pin coupling current limiting electricity
It is grounded after being coupled with electric capacity C13 after resistance R25, electric capacity C13, which has been effectively eliminated, is filtered the voltage transformer CT1 voltages exported
Ripple, improve sampling precision；Filtered jointly using C12 and C13, improve filter effect, while benchmark pin is coupled to reference voltage electricity
Road 2 provides stable reference voltage, greatly improves the precision of voltage acquisition.By setting the stable electricity of voltage stabilizing chip U8 outputs
Pressure, voltage stabilizing chip U8 can be TL431, and voltage stabilizing chip U8 sampling end after being coupled with resistance R65 after restraining end short circuit with coupling
To power supply, the restraining end of the voltage stabilizing chip U8 is coupled with after resistance R66 be coupled with resistance R67 after be grounded, can be at restraining end
Reference voltage of the stable 2.5V voltages to main control chip 21 as main control chip 21 is exported, existing main control chip 21 uses core
Reference voltage inside piece, chip internal reference voltage, which exists, fluctuates the problem of larger, and stability is low, defeated using voltage stabilizing chip U8
It is stable to main control chip 21, reference voltage to go out reference voltage；It is mutual to be coupled to voltage for resistance R66 and resistance R67 tie point simultaneously
Sensor CT1 benchmark pin, stable reference voltage is provided to benchmark pin, it is more accurate than using the reference voltage of chip internal, and
Circuit is simple, and cost is low.Parallel electrolytic electric capacity EC12 and electric capacity between resistance R67 and voltage transformer CT1 benchmark pin
C38, the voltage of output is filtered, ensures that the voltage of output is steady, improve the stability of circuit.It is not provided with electrochemical capacitor
There is trickle fluctuation in EC12 and electric capacity C38 circuit output reference voltage, by simply setting electrochemical capacitor EC12 and electricity
Hold C38 to be filtered, improve the reference voltage degree of accuracy, cost is low, and effect is good.Serial or parallel connection adjusts current-limiting resistance 111 and taken
The resistance of sample resistance 112 can accurately control the multiple of decompression, and then improve the accuracy of gathered data, use multiple electricity
Resistance is used as current-limiting resistance 111 or sample resistance 112 in parallel or series, adds the area of dissipation of resistance, improves radiating effect,
Improve circuit stability.
As a kind of improved embodiment, the power circuit 4 includes：Suppress cross talk circuit 41, voltage stabilizing electricity
Road 42, transformer and rectification circuit, the rectification circuit include input, output end and common port, the transformer just
Level side is coupled to outside main power supply, and primary side is coupled to the input of rectification circuit, the output end coupling of the rectification circuit
To suppression cross talk circuit 41 and mu balanced circuit 42.Using in process of the present invention, rectification circuit is rectification chip, by by outside
Main power supply is coupled to after transformer pressure-reducing after input rectification circuit rectification suppresses cross talk circuit 41 and mu balanced circuit 42, voltage stabilizing
The stable supply voltage of the output of circuit 42；During by transformer pressure-reducing, surge reduces, and is coupled to suppresses cross talk circuit 41 afterwards,
Suppress crosstalk, avoid influence of the high pressure crosstalk to position signalling sample circuit, suppress cross talk circuit 41 including parallel with one another
Electrochemical capacitor EC7, electric capacity C30 and Transient Suppression Diode TVS5, electrochemical capacitor EC7 and electric capacity C30 filter the signal after rectification
Ripple, the effect that Transient Suppression Diode TVS5 suppresses crosstalk is improved, extend the service life for suppressing cross talk circuit 41, then by wink
State suppresses diode TVS5, suppresses position signalling sample circuit power end external high pressure crosstalk, improves position signalling sample circuit
The accuracy of gathered data.It is not provided with suppressing crosstalk electricity between existing switching switching power circuit and position signalling sample circuit
Crosstalk phenomenon be present, make position signalling sample circuit gathered data in road 41, position signalling sample circuit power end external high voltage
Accuracy is low, influences user's use.
As a kind of improved embodiment, it is steady that the mu balanced circuit 42 includes the first mu balanced circuit 421, second
Volt circuit 422,421 and second mu balanced circuit of the first mu balanced circuit 422 is in parallel, first mu balanced circuit 421 and second
The input of mu balanced circuit 422 is coupled to the output end of rectification circuit, the mu balanced circuit of the first mu balanced circuit 421 and second
The output supply voltage series of 422 output end is different；Second mu balanced circuit 422 includes primary mu balanced circuit
4221 and secondary mu balanced circuit 4222, the input of the primary mu balanced circuit 4221 be coupled to the output end of rectification circuit, institute
The output end for stating primary mu balanced circuit 4221 is coupled to the input of secondary mu balanced circuit 4222, the primary mu balanced circuit 4221
It is different with the output supply voltage series of the output end of secondary mu balanced circuit 4222.In using process of the present invention, first
The out-put supply power supply series of the output end of the mu balanced circuit 422 of mu balanced circuit 421 and second is different, after being switched according to switching
The power demands of level chip and circuit carry out classification power supply, and select work according to the cost of chip price and the power consumption of chip
The suitable chip of voltage, the power consumption of switching switch is further reduced while reducing cost, reduces the heat production of switching switch,
The service life of switching switch is extended, reduces the waste of the energy.Mu balanced circuit 42 in existing switching switch only includes
One mu balanced circuit 42, one-level voltage stabilizing can only be carried out, can not meet that multiple voltage is powered to respective chip, high power consumption need to be used
Chip, energy waste be present and add cost.U5 can be LM2575T-12, pass through the output end coupling in voltage stabilizing chip U5
Burning voltage is exported after meeting inductance L1, voltage stabilizing chip U5 is according to the stable electricity of the feedback and inductance L1 charge and discharges electricity output of feedback input end
Pressure；Schottky diode D2 is coupled in voltage stabilizing chip U5 output end simultaneously, Schottky diode can be immediately from conducting state
Not on-state is switched to, the problem of without reverse recovery time and reverse current, passes through Schottky diode D2 and inductance L1
Charge and discharge electricity output burning voltage；Voltage stabilizing chip U5 output end is coupled with electrochemical capacitor EC8 parallel with one another and electric capacity C33 is followed by
Ground, the voltage of output is filtered, improves the stability of output voltage.Primary mu balanced circuit 4221 and secondary mu balanced circuit
The output supply voltage series of 4222 output end is different, and accurate draw is carried out using the demand of chip and circuit according to rear class
Point, the primary output supply voltage of mu balanced circuit 221 can be 5V, and the secondary output supply voltage of mu balanced circuit 4222 can be
3.3V, meets the power demands of most chips and circuit, and the power circuit 4 of existing switching switch uses single voltage stabilizing
Circuit 2, single supply voltage being exported, different chips and circuit power supply can not be needed to supply voltage, circuit is more complicated,
Energy waste be present and add cost.U6 can be LM2575T-5.0, and electricity is coupled by the output end in voltage stabilizing chip U6
Burning voltage is exported after sense L2, and voltage stabilizing chip U6 is according to the feedback and inductance L2 charge and discharge electricity output burning voltages of feedback input end；
Schottky diode D3 is coupled in voltage stabilizing chip U6 output end simultaneously, it is defeated by Schottky diode D3 and inductance L2 discharge and recharges
Go out burning voltage；Voltage stabilizing chip U6 output end is grounded after being coupled with electrochemical capacitor EC11 and electric capacity C37 parallel with one another, will be defeated
The voltage gone out is filtered, and improves the stability of output voltage.U7 can be SPX1117-3.3, voltage stabilizing chip U7 input
It is grounded after being coupled with electric capacity C35, the voltage stabilizing chip U6 voltages exported is filtered, makes the voltage that voltage stabilizing chip U7 is received more
It is stable, meanwhile, it is grounded, filters after voltage stabilizing chip U7 output end is coupled with electrochemical capacitor EC10 and electric capacity C36 parallel with one another
Except the burr of output voltage, the stability of output voltage is improved.Existing switching switching power circuit is not provided with stablizing 3.3V
The secondary mu balanced circuit 4222 of voltage, the chip power-consumption used is high, is unsuitable for practicality.The stable voltage of secondary mu balanced circuit 4222
For 3.3V, substantial amounts of energy can be lost to 3.3V in directly voltage stabilizing to transformation afterwards, can produce substantial amounts of heat, energy waste is seriously same
When the security incident such as be subject to fire, and shorten the service life of switching switch, therefore existing switching switch internal selection
The slightly higher chip of operating voltage is used, and compared with low-voltage chip, power consumption is high, and a large amount of uses have energy waste, this
Invention first by after voltage stabilization to 5V, afterwards by stable 5V voltage stabilizations to 3.3V, can provide two-stage electricity to late-class circuit
Pressure, heat production is few during voltage stabilizing, and circuit stability is high, avoids the potential safety hazards such as fire.Transient Suppression Diode TVS7 is set,
Avoid voltage surge to have an impact voltage stabilizing chip U7, improve the stabilization for the voltage for being input to voltage stabilizing chip U7 inputs
Property, avoid voltage stabilizing chip U7 from being damaged by surge voltage, ensure that the stability that secondary mu balanced circuit 4222 works.
As a kind of improved embodiment, also include station acquisition circuit 5, the station acquisition circuit 5 has
There is a position optocoupler 51, the station acquisition circuit 5 is coupled to the output end of each suppression cross talk circuit 41, receiving position signal, and
Position signalling is output to position optocoupler 51, the outgoing position signal of position optocoupler 51, the output end of position optocoupler 51 is coupled with RC
Filter circuit, main control chip 21 is output to after position signalling is filtered.In using process of the present invention, by the way that station acquisition is electric
Road 5 is coupled to the output end of each suppression cross talk circuit 41, receiving position signal, whether just to judge same group of outside main power supply
Often power supply, main control chip 21 send indication signal and indicated to indicator light circuit 8；Main power supply all can not outside same group
During normal power supply, corresponding indicator lamp lights, and is easy to user to judge the power supply of abnormal electrical power supply, is easy to electrician to investigate and solve, carries
The maintenance speed of high electrician, reduce fault time.
As a kind of improved embodiment, also include fire-fighting circuit 6, the fire-fighting circuit 6 is coupled to outside
Fire-fighting sending point and main control chip 21, the fire-fighting circuit 6 have fire-fighting optocoupler 61, and the fire-fighting optocoupler 61 has input
And output end, the input of the fire-fighting optocoupler 61 are coupled with piezo-resistance VR1 and current-limiting resistance R41, the fire-fighting circuit 6 connects
Receive the fire-fighting signal that outside fire-fighting sending point is sent and be output to fire-fighting optocoupler 61, fire-fighting optocoupler 61 exports fire-fighting signal, fire-fighting light
The output end of coupling 61 is coupled with after RC filter circuits be coupled with magnetic bead CZ13 after be coupled to main control chip 21, set magnetic bead CZ13 to resist
Radio frequency interference, the accuracy of fire-fighting signal is improved, improve the stability that main control chip 21 works, exported after fire-fighting signal is filtered
To main control chip 21.In using process of the present invention, fire-fighting circuit 6 receives the fire-fighting signal that outside fire-fighting sending point is sent, and
Fire-fighting signal is output to the input of fire-fighting optocoupler 61, the output end of fire-fighting optocoupler 61 is coupled to main control chip 21, master control core
Piece 21 disconnects outside main power supply corresponding to fire-fighting signal after receiving fire-fighting signal, with being not provided with the active and standby of fire-fighting circuit 6
Power change-over switch control circuit is compared, and is avoided power supply short circuit and is caused the serious security incident such as fire, reduces accident hair
Raw rate, effectively protect the people's lives and property safety.Piezo-resistance VR1 and current-limiting resistance R41 is set effectively to avoid simultaneously
Overcurrent and overvoltage offset the influence of anti-circuit 6, extend the service life of fire-fighting circuit 6.
As a kind of improved embodiment, in addition to LCD display circuit 7, the LCD display circuit has LCD
Chip and triode Q2, the LCD chip have backlight electric power positive pole pin and backlight electric power negative pin, the LCD chip
Backlight electric power negative pin ground connection, the backlight electric power positive pole pin of the LCD chip is coupled to triode Q2 colelctor electrode, institute
The emitter stage for stating triode Q2 is coupled to power supply, and the base stage of the triode Q2 is coupled to main control chip 21 after being coupled with resistance.
In using process of the present invention, set LCD chip to be used to show switching switch working state, be easy to user to check, meanwhile, will
The backlight electric power positive pole of LCD chip is coupled to triode Q2 colelctor electrode, and triode Q2 emitter stage is coupled to power supply, triode
Q2 base stage is coupled with resistance and is followed by main control chip 21, when user does not inquire about switching switch working state by LCD chip,
LCD chip low-power consumption uses, and backlight electric power does not work, and reduces energy waste, and the outside of main control chip 21 is provided with some buttons, this hair
Bright not explain herein, when user presses the button of backlight electric power positive pole, main control chip 21 exports backlight electric power positive pole and lighted
Signal, control backlight electric power is lighted, and the internal processes of main control chip 21 set delay procedure, and the back of the body is exported after the certain time that is delayed
Photoelectric source black out signal, control backlight electric power extinguish, and save the energy, reduce consumption, green.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
- A kind of 1. control circuit of main power supply switching switch, it is characterised in that：Include：Voltage sampling circuit (1), is coupled to outside collection point, for collection voltages and output voltage signal；Switching switch governor circuit (2), the switching switch governor circuit (2) include main control chip (21) and respective peripheral electricity Road, the main control chip (21) are coupled to voltage sampling circuit (1), receiving voltage signal and output switch switching signal, according to Each circuit state output indication signal；Relay drive circuit (3), the relay drive circuit (3) are coupled to main control chip (21) and outside main power supply, Receive the outside main power supply of switch switching signal switching of main control chip (21) output；Power circuit (4), include input and output end, input is coupled to external power source, and output end is coupled to voltage and adopted Sample circuit (1), switching switch governor circuit (2) and relay drive circuit (3), to voltage sampling circuit (1), switching switch master Control circuit (2) and relay drive circuit (3) power supply；Indicator light circuit (8), the indicator light circuit (8) are coupled to main control chip (21), receive the indication signal of main control chip, Corresponding indicator lamp is controlled to light；Button circuit (9), the button circuit are coupled to main control chip (21), receive outside click signal and are output to master control core Piece (21).The voltage sampling circuit (1) has：Isolation circuit (11), the isolation circuit (11) have input and output end, The input of the isolation circuit (11) is coupled to outside collection point, and the output end of the isolation circuit (11) is coupled to master control core Piece (21), receives the voltage signal of outside collection point, and main control chip (21) is output to after voltage signal is isolated.
- 2. the control circuit of main power supply switching switch according to claim 1, it is characterised in that：The relay driving Circuit (3) includes zero line controlling switch K1 and live wire controlling switch K2, the zero line controlling switch K1 and outside main power supply Zero line couples, and the live wire controlling switch K2 and outside main power supply live wire couple, the zero line controlling switch K1 and live wire Controlling switch K2 also couples with main control chip (21), and receives the switch switching signal control switching of main control chip (21) output Outside main power supply.
- 3. the control circuit of main power supply switching switch according to claim 2, it is characterised in that：The relay driving Circuit (3) also includes active-standby switch master switch K3, the active-standby switch master switch K3 and zero line controlling switch K1 and live wire controls K2 couplings are switched, receive the outside main power supply of its output, the active-standby switch master switch K3 also couples with main control chip (21), And receive the outside main power supply output of switch switching signal control switching of main control chip (21) output or disconnect.
- 4. the control circuit of main power supply switching switch according to claim 3, it is characterised in that：Also include resistance-capacitance circuit (31), the resistance-capacitance circuit (31) includes the resistance and electric capacity being serially connected, and the other end of the electric capacity relative resistance is coupled to Also coupled after active-standby switch master switch K3 with outside electrical appliance, the other end of the resistance relative capacity is coupled to electrical appliance selection Also coupled after switch with outside electrical appliance.
- 5. the control circuit of main power supply switching switch according to claim 1 or 2, it is characterised in that：The isolation electricity Road (11) includes voltage transformer CT1, current-limiting resistance (111) and sample resistance (112), and the voltage transformer CT1 has Input and output end, the input of the voltage transformer CT1 are coupled to outside collection after being coupled to current-limiting resistance (111) Point, main control chip (21) is coupled to after output end coupling sample resistance (112) of the voltage transformer CT1, the voltage is mutual Sensor CT1 by the signal for receiving collection point and is output to main control chip (21) after isolation.
- 6. the control circuit of main power supply switching switch according to claim 1 or 2, it is characterised in that：The power supply electricity Road (4) includes：Accurate anti-surge circuit (41), mu balanced circuit (42), transformer and rectification circuit, the rectification circuit include There are input, output end and common port, the primary side of the transformer is coupled to outside main power supply, and primary side is coupled to rectification The input of circuit, the output end of the rectification circuit are coupled to accurate anti-surge circuit (41) and mu balanced circuit (42).
- 7. the control circuit of main power supply switching switch according to claim 6, it is characterised in that：The mu balanced circuit (42) the first mu balanced circuit (421), the second mu balanced circuit (422), first mu balanced circuit (421) and the second voltage stabilizing are included Circuit (422) is in parallel, and the input of first mu balanced circuit (421) and the second mu balanced circuit (422) is coupled to rectification circuit Output end, the output supply voltage series of the output end of first mu balanced circuit (421) and the second mu balanced circuit (422) is mutual Differ；Second mu balanced circuit (422) includes primary mu balanced circuit (4221) and secondary mu balanced circuit (4222), described The input of primary mu balanced circuit (4221) is coupled to the output end of rectification circuit, the output of the primary mu balanced circuit (4221) End is coupled to the input of secondary mu balanced circuit (4222), the primary mu balanced circuit (4221) and secondary mu balanced circuit (4222) Output end output supply voltage series it is different.
- 8. the control circuit of main power supply switching switch according to claim 1 or 2, it is characterised in that：Also include position Acquisition Circuit (5) is put, the station acquisition circuit (5) has position optocoupler (51), and the station acquisition circuit (5) is coupled to respectively The output end of accurate anti-surge circuit (41), receiving position signal, and position signalling is output to position optocoupler (51), position light Coupling (51) outgoing position signal, the output end of position optocoupler (51) are coupled with RC filter circuits, exported after position signalling is filtered To main control chip (21).
- 9. the control circuit of main power supply switching switch according to claim 1 or 2, it is characterised in that：Also include and disappear Anti- circuit (6), the fire-fighting circuit (6) are coupled to outside fire-fighting sending point and main control chip (21), fire-fighting circuit (6) tool There is fire-fighting optocoupler (61), the fire-fighting optocoupler (61) has input and output end, the input of the fire-fighting optocoupler (61) Piezo-resistance VR1 and current-limiting resistance R41 are coupled with, the fire-fighting circuit (6) receives the fire-fighting letter that outside fire-fighting sending point is sent Fire-fighting optocoupler (61), fire-fighting optocoupler (61) output fire-fighting signal number are output to, the output end of fire-fighting optocoupler (61) is coupled with RC filters Main control chip (21) is coupled to after magnetic bead CZ13 is coupled with after wave circuit, main control chip is output to after fire-fighting signal is filtered (21)。
- 10. the control circuit of main power supply switching switch according to claim 1 or 2, it is characterised in that：Also include LCD Display circuit (7), the LCD display circuit have LCD chip and triode Q2, and the LCD chip has backlight electric power positive pole Pin and backlight electric power negative pin, the backlight electric power negative pin ground connection of the LCD chip, the backlight electricity of the LCD chip Source positive pole pin is coupled to triode Q2 colelctor electrode, and the emitter stage of the triode Q2 is coupled to power supply, the triode Q2 Base stage be coupled with resistance after be coupled to main control chip (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058832.9A CN107689670B (en) | 2017-11-01 | 2017-11-01 | Control circuit of main and standby power supply change-over switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058832.9A CN107689670B (en) | 2017-11-01 | 2017-11-01 | Control circuit of main and standby power supply change-over switch |
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| CN107689670A true CN107689670A (en) | 2018-02-13 |
| CN107689670B CN107689670B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711058832.9A Active CN107689670B (en) | 2017-11-01 | 2017-11-01 | Control circuit of main and standby power supply change-over switch |
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| CN107689670B (en) | 2024-03-15 |
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