CN206923111U - A kind of single live wire total power touch switch circuit - Google Patents
A kind of single live wire total power touch switch circuit Download PDFInfo
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- CN206923111U CN206923111U CN201720306480.3U CN201720306480U CN206923111U CN 206923111 U CN206923111 U CN 206923111U CN 201720306480 U CN201720306480 U CN 201720306480U CN 206923111 U CN206923111 U CN 206923111U
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Abstract
It the utility model is related to a kind of single live wire total power touch switch circuit, the main switch element and main switch element control unit being located at including DC power source unit, body capacitance touch detection unit, string in main circuit, the main switch element includes a bidirectional thyristor, a relay KA, goes here and there and is located in main circuit after the normally open contact parallel connection of the bidirectional thyristor and relay.The utility model is by the way that string sets the normally open contact of bidirectional thyristor and relay in main circuit simultaneously in parallel in on-off circuit, load detecting circuit by detect load current by storage capacitor charge to setting magnitude of voltage time judge on-off circuit load, circuit structure is very simple and reliable operation, low cost product, under small load condition, the screened circuit shields the body capacitance touch detection unit and exported to the opening control signal of control relay circuit input so as to disconnect relay, and under heavy load state, control signal is kept it turned on so as to closing relay, therefore it is adapted to the load of high or low power simultaneously, have a extensive future.
Description
Technical field
A kind of wall touch switch control circuit is the utility model is related to, particularly single live wire total power soft-touch control electricity
Road.
Background technology
It is wall touch switch good appearance, generous, touch no abrasion, service life length is dust-proof, water proof is safe and reliable, deep
Liked by users, therefore application is more and more extensive.The electrical appliance of wall touch switch control is according to its rated power
Size be divided into small power switch and high power switch, usual rated power is small power switch in below 200W, more than 500W
For high power switch.According in on-off circuit as the main switch element used in the main circuit of load current major avenues of approach not
Together, existing wall touch switch is broadly divided into two kinds of KA formulas soft-touch control and SCR formulas soft-touch control, respectively with relay（KA）
With bidirectional thyristor as main switch element.Because the characteristic of its main switch element used is different, two kinds of touch is opened
Respectively there are advantage and deficiency in pass：1）Bidirectional thyristor（SCR）Formula soft-touch control can be set to ZVT, and driving current is small, control
Without stroboscopic and the advantages of glimmer during small-power light fixture, but bidirectional thyristor is limited by heat-sinking capability, is often suitable only for controlling
Below 500W processed is loaded, it is impossible to takes into account high power load；2）Relay system soft-touch control can be used in high-power electric appliance
Occasion, but relay system soft-touch control coil power consumption is big, it is impossible to low-power load is taken into account, and what is switched opens, turns off at random,
Rush of current is big, electromagnetic interference is big, is difficult to the requirement that meets EMC；Although can be taken into account using magnetic latching relay high or low power,
Price is 3 ~ 4 times of common relay, and cost performance is low, it is difficult to realize it is popular, influence switch application field.
Utility model content
The purpose of this utility model be for overcome the deficiencies in the prior art provide a kind of simple in construction, cost it is low and
It is adapted to single live wire total power touch switch circuit of small-power and high power load simultaneously.
To achieve the above object, the utility model provides a kind of single live wire total power touch switch circuit, including direct current
Power subsystem, body capacitance touch detection unit, string are located at main switch element and main switch element control list in main circuit
Member, it is characterised in that：The main switch element include a bidirectional thyristor, a relay, the bidirectional thyristor and after
Go here and there and be located in main circuit after the normally open contact parallel connection of electrical equipment；The main switch element control unit include thyristor control circuit,
Control relay circuit and load detecting and screened circuit, the body capacitance touch detection unit output end control with IGCT
The input of circuit and control relay circuit connects；The load detecting and screened circuit are serially connected in main circuit including one
Sampling capacitance, by detect load current by storage capacitor charge to setting magnitude of voltage time judge on-off circuit load,
Under small load condition, the load detecting and screened circuit shield the body capacitance touch detection unit and exported to relay
The opening control signal of control circuit input.
The utility model by on-off circuit in parallel simultaneously in main circuit string set bidirectional thyristor and
Storage capacitor is charged to setting magnitude of voltage by the normally open contact of relay, load detecting and screened circuit by detecting load current
Time judge that on-off circuit loads so that load detecting circuit structure is very simple and work is relatively reliable, and product cost is low
Honest and clean, under small load condition, shielding body capacitance touch detection unit is exported to the unlatching control of control relay circuit input
Signal processed is so as to disconnect relay, and under heavy load state, keeps it turned on relay control signal so as to closing relay, because
This is adapted to the load of high or low power simultaneously, has a extensive future.
The utility model is further described below in conjunction with the accompanying drawings and the specific embodiments.
Brief description of the drawings
Accompanying drawing 1 is the circuit theory diagrams of the utility model specific embodiment 1；
Accompanying drawing 2 is the circuit theory diagrams of the utility model specific embodiment 2；
Accompanying drawing 3 is the circuit theory diagrams of the utility model specific embodiment 3；
Accompanying drawing 4 is the circuit theory diagrams of the utility model specific embodiment 4.
Embodiment
Single live wire total power touch switch circuit of the present utility model includes DC power source unit, body capacitance touch detection
Unit, string are located at main switch element and main switch element control unit in main circuit, and the main switch element includes one
Bidirectional thyristor, a relay KA, string is located at main circuit after the normally open contact parallel connection of the bidirectional thyristor and relay（I.e.
The passage of load current）In；The main switch element control unit includes thyristor control circuit, control relay circuit and born
Carry detection and screened circuit, the body capacitance touch detection unit output end and thyristor control circuit and Control electricity
The input connection on road, to send conducting to thyristor control circuit and control relay circuit simultaneously（Closure）Or cut-off（It is disconnected
Open）Control signal, load detecting and screened circuit determine whether shielding wherein further according to the size of the bearing power detected
The conducting of control relay circuit（Closure）Control signal；The output signal of body capacitance touch detection unit is according to IGCT control
The requirement of circuit and control relay circuit processed can be pulse signal or level signal.The load detecting and screen
Covering circuit includes a sampling capacitance being serially connected in main circuit, load detecting and screened circuit by detecting load current by storage
The time that energy electric capacity charges to setting magnitude of voltage judges that on-off circuit loads, under small load condition, the screened circuit shielding
The body capacitance touch detection unit is exported to the opening control signal of control relay circuit input so that circuit is small
During load, bidirectional thyristor conducting, relay KA normally open contact disconnects, in heavy load, bidirectional thyristor cut-off, and relay
KA normally open contact closure.The control switching circuit can use using single-chip microcomputer as the single chip microcomputer system of core or
PLC realizes that but this can cause cost to increase, at the same the control program inside single chip microcomputer system there is also error or
The risk of deadlock.
Specific embodiment 1：
As shown in figure 1, in this specific embodiment, the body capacitance touch detection unit is by condenser input circuit and electric capacity
Touch detection circuit forms, and is controlled with the aspect of level, to improve antijamming capability.The condenser input circuit
It is made up of touch sheet M and trigger sensitivity regulation electric capacity, condenser input circuit adjusts electric capacity C8 by touch sheet M and trigger sensitivity
Composition, the trigger sensitivity regulation electric capacity C8 mono- terminate power cathode, and the other end is connected simultaneously with touch sheet M while is used as electric capacity
The output end of input circuit, touch sheet M are made up of conductive metal sheet, can be with by setting suitable adjustment of sensitivity electric capacity C8
Suitable touch sensitivity is obtained, prevents false triggering, adjustment of sensitivity electric capacity C8, which generally selects 30-47pF, to be advisable；The electric capacity
Touch detection circuit is that the bistable circuit that core forms is formed by single channel capacitive touch switch integrated circuit U1, single channel electricity
Hold soft-touch control integrated circuit U1 and such as integrated chip such as RH6030, TTP223, ASC0111B, SOT23-6 can be selected, this is specific real
Apply example and select RH6030, single channel capacitive touch switch integrated circuit U1 the 4th, 5,6 pin be connected to the positive pole of dc source,
2 pin are connected to the negative pole of dc source, and touch sheet M is connected with single channel capacitive touch switch integrated circuit U1 the 3rd pin, triggering
Adjustment of sensitivity electric capacity C1 is connected between single channel capacitive touch switch integrated circuit U1 the 2nd pin and the 3rd pin and formed initially
The bistable circuit for high level is exported, single channel capacitive touch switch integrated circuit U1 the 1st pin is output end, when the electricity
When holding the input end capacitor increase of touch detection circuit, the output end level upset of the capacitance touch detection circuit.
The DC power source unit includes charging circuit, pre- mu balanced circuit and smart mu balanced circuit.Pre- mu balanced circuit includes the
One storage capacitor C3, stabilized switch pipe V4, the 4th phase inverter U3-2, the 5th phase inverter U3-1, the 3rd pull down resistor R3, on first
Pull-up resistor R20, first threshold voltage-regulator diode VD3 and the 3rd isolating diode VD8, the stabilized switch pipe V4 select field-effect
Pipe, preferably low-voltage driving FET, the source electrode of the stabilized switch pipe V4 and drain electrode and the bidirectional thyristor and relay
Formed after device KA normally open contact parallel branch series connection in main circuit, external connection point L1, the L of both ends as circuit, described the
The second pull down resistor R4, the first threshold voltage stabilizing two are connected between four phase inverter U3-2 input and working power negative pole
Pole pipe VD3 is connected between the 4th phase inverter U3-2 input and the first storage capacitor C3 positive terminals, first threshold voltage stabilizing two
Pole pipe VD3 negative electrode is connected with the first storage capacitor C3 positive terminals, and the 3rd isolating diode VD8 is connected to the 4th phase inverter
Between U3-2 output end and the 5th phase inverter U3-1 inputs, it is anti-that the 3rd isolating diode VD8 negative electrodes are connected to the 4th
The 4th phase inverter U3-2 high level output is isolated in phase device U3-2 output end, the 3rd pull down resistor R3 connections
Between the 5th phase inverter U3-1 input working power negative poles, the first pull-up resistor R20 is connected to the 5th phase inverter U3-
Between 1 input working power positive pole, the 5th phase inverter U3-1 output ends are connected with stabilized switch pipe V4 grids；The smart voltage stabilizing
Circuit includes filter capacitor C1, three terminal regulator U2 and the first storage capacitor C3, the filter capacitor C1 is connected to three-terminal voltage-stabilizing
Between device U2 output ends and working power negative pole, the first storage capacitor C3 is connected to three terminal regulator U2 inputs；It is described
Charging circuit includes the 3rd charging diode VD2, the 4th charging diode VD5, the second current-limiting resistance R1, the 3rd charging diode
VD2 is connected to one end and of the normally open contact parallel branch of bidirectional thyristor and relay after being connected with the second current-limiting resistance R1
The first power source charges branch road is formed between one storage capacitor C3 positive terminal, the 4th charging diode VD5 anodes are connected to two-way
The other end of the normally open contact parallel branch of IGCT and relay, the 4th charging diode VD5 negative poles are connected to the first energy storage
Electric capacity C3 positive terminal forms second source charging paths.
Control relay circuit in the main switch element control unit includes first switch triode V3 and close by applying
The first shaping circuit that special phase inverter is formed.First shaping circuit determines Schmidt according to the level relationship of input and output
The quantity of phase inverter, the incoming level requirement of first shaping circuit and output level are on the contrary, therefore only by the first phase inverter
U5-3 forms first shaping circuit, first switch triode V3 preferred lower pressures driving stabilized switch pipe, the relay KA
It is connected to after coil and first switch triode V3 drain series between working power the two poles of the earth, first switch triode V3 source electrode
It is connected with working power negative pole, the first phase inverter U5-3（First shaping circuit）Output end is with first switch triode V3's
Control pole（That is grid）Connection, is connected with first between the control pole and working power negative pole of the first switch triode V3
Pull-up resistor R13, the first phase inverter U5-3（First shaping circuit）Input is provided with the first RC discharge and recharges electricity of slow play fast charge
Road, first RC charge-discharge circuit include the second discharge resistance R8, the 3rd storage capacitor C6 and the first charging diode VD10,
The 3rd storage capacitor C6 is connected to the first phase inverter U5-3（First shaping circuit）Between input and working power negative pole,
Body capacitance touch detection unit output end is connected to after the second discharge resistance R8 and the first charging diode VD10 parallel connections
With the first phase inverter U5-3（First shaping circuit）Between input, the first charging diode VD10 anode taps touch with body capacitance
Touch the connection of detection unit output end.Such setting, when body capacitance touch detection unit exports high level signal, it can pass through
First charging diode VD10 is to the 3rd storage capacitor C6 quick charges to high level, when body capacitance touch detection unit exports
During low level signal, electricity reaches slow play fast charge, so by the second discharge resistance R8 delay releases in the 3rd storage capacitor C6
To ensure that relay relative to connecting after bidirectional thyristor VT1, first disconnecting, avoids producing spark and electromagnetic interference.
Thyristor control circuit in the main switch element control unit includes the first amplifying triode V2, photoelectric coupling
Device OP1, the first current-limiting resistance R12 and the second shaping circuit being made up of schmitt inverter, similarly, the second shaping electricity
Road determines the quantity of schmitt inverter according to the level relationship of input and output, and originally second shaping circuit is anti-by a Schmidt
The second phase inverter of phase device U5-1 is formed.Single live wire total power touch switch circuit is turned in zero-voltage state, and zero current condition is closed
Disconnected is optimal mode of operation, because being no-voltage, the corresponding electric current very little just turned on, electromagnetic interference is small, and zero current shape
State turns off, and would not produce spark between contact, can extend relay KA service life, therefore, the photoelectrical coupler
The photoelectrical coupler of OP1 preferred voltage passing zero trigger types, the first amplifying triode V2 select model as the case may be, and this is specific
It is NPN type in embodiment, the photoelectrical coupler OP1 inputs are serially connected on the first amplifying triode V2 colelctor electrode, and first
Current-limiting resistance R12 is connected on the first amplifying triode V2 emitter stage, is then connected between working power the two poles of the earth to form and is put
Big circuit, the outlet side both ends of the photoelectrical coupler OP1 are connected and are connected to bidirectional thyristor VT1 after the 4th current-limiting resistance R14
G poles and T2 between control the bidirectional thyristor VT1, the second phase inverter U5-1（Second shaping circuit）Input is provided with
Slow down the second RC charge-discharge circuit filled soon, second RC charge-discharge circuit includes the second charging resistor R7, the second energy storage electricity
Hold C5 and the first discharge diode VD11, the second charging resistor R7 and the first discharge diode VD11 parallel connections and stored up with second
It can be connected to after electric capacity C5 between body capacitance touch detection unit output end and working power negative pole, the first discharge diode
VD11 negative electrodes are connected with body capacitance touch detection unit output end, the second charging resistor R7 and the first discharge diode
VD11 parallel branches and the second storage capacitor C5 tie point pass through input resistance R17 and the second phase inverter U5-1（Second shaping
Circuit）Input connects, the second phase inverter U5-1（Second shaping circuit）Output end and the first amplifying triode V2 base stages
Connection, such setting, when body capacitance touch detection unit exports low level signal, electricity passes through in the second storage capacitor C5
The first discharge diode VD11 repid discharges are crossed to low level, when body capacitance touch detection unit exports high level signal,
High level is charged to the second storage capacitor C5 delays by the second charging resistor R7, so to ensure relay relative to two-way
Connect after IGCT VT1, first disconnect, avoid producing spark and electromagnetic interference.
Load detecting and screened circuit include the first storage capacitor C3, the first divider resistance R10, the second divider resistance R11,
The 3rd shaping circuit, the 4th isolating diode VD14 and the 3rd current-limiting resistance R18 being made up of schmitt inverter, described first
Storage capacitor C3 is used as sampling capacitance simultaneously, the partial pressure branch after the first divider resistance R10 and the second divider resistance R11 series connection
Road is connected between the 4th charging diode VD5 anodes and working power negative pole, and the 3rd shaping circuit is by two Schmidts
Phase inverter hex inverter U5-4 and the 7th phase inverter U5-5 concatenations are formed, the dividing point and the 7th phase inverter of the partial pressure branch road
U5-5's（3rd shaping circuit）Input connects, the hex inverter U5-4's（3rd shaping circuit）Output end is by the
Four isolating diode VD14 and the 3rd current-limiting resistance R18 and the first phase inverter U5-3（First shaping circuit）Input connects
Connect.
The DC power source unit operation principle is as follows：This circuit is serially connected in live wire together with load, under original state,
Civil power forms the first power source charges branch road to the first energy storage after the 3rd charging diode VD2 connects with the second current-limiting resistance R1
Electric capacity C3 charging, voltage gradually rises on the first storage capacitor C3, when the breakdown for rising to first threshold voltage-regulator diode VD3
Voltage（Voltage stabilizing value）When, because the second current-limiting resistance R1 values are larger, charging current very little, therefore on the first storage capacitor C3
Voltage no longer rises, voltage kept stable.
After someone touches the touch sheet M, the output of body capacitance touch detection unit is changed into low level, the second storage
High level in energy electric capacity C5 passes through the first discharge diode VD11 repid discharges to low level, then by the second phase inverter U5-1
Upset is high level afterwards, and the first amplifying triode V2 is turned on, and photoelectrical coupler OP1 input sides flow through electric current, and outlet side flows through tactile
Generated electricity stream, and bidirectional thyristor VT1 is turned on immediately；Meanwhile the 3rd high level signal in storage capacitor C6 passes through the second electric discharge electricity
R8 delay releases are hindered to low level, then upset is high level after the first phase inverter U5-3, first switch triode V3 is turned on,
Relay KA is delayed adhesive, has electric current in load, while the load current touches by bidirectional thyristor VT1 and/or relay KA
After head, then the 5th phase inverter U3-1 input high levels, export low level, stabilized switch pipe V4 cut-offs, and load current passes through the 4th
Charging diode VD5 charges to the first storage capacitor C3, when charging to the voltage on the first storage capacitor C3（VCC1）Greatly
When first threshold voltage-regulator diode VD3 voltage stabilizing value is with the 5th phase inverter U3-1 turning-on voltage sums, first threshold voltage stabilizing two
Pole pipe VD3 reverse breakdowns turn on, and the 4th phase inverter U3-2 input is changed into high level, and output is changed into low level, and by the 5th
Phase inverter U3-1 inputs are pulled down to low level, and the 5th phase inverter U3-1 outputs are changed into high level, and driving stabilized switch pipe V4 is led
Logical, load current stops storing up to first by bidirectional thyristor VT1 and/or the outflow of relay KA contacts and stabilized switch pipe V4
Can electric capacity C3 chargings.When the voltage on the first storage capacitor C3 because the consumption of internal circuit is gradually reduced to first threshold voltage stabilizing
When diode VD3 voltage stabilizings value is with below the 5th phase inverter U3-1 shut-off voltage sums, first threshold voltage-regulator diode VD3 recovers to cut
When only, due to the first pull-up resistor R20 be present, the 5th phase inverter U3-1 input inputs are changed into high level, output end
It is changed into low level, stabilized switch pipe V4 recovers cut-off, when civil power is positive half cycle, recovers to charge to the first storage capacitor C3 again,
Go round and begin again so that the voltage on the first storage capacitor C3 is basicly stable, magnitude of voltage substantially with first threshold voltage-regulator diode VD3
Voltage stabilizing value is related, the time charged every time and load current（Load）Relevant, load is bigger, and the time of charging is shorter, conversely,
Load smaller, the time of charging is longer.Voltage on first storage capacitor C3 passes through three terminal regulator U2 further voltage stabilizing again
Stable working power VCC2 is exported afterwards to power for other circuits.
Load detecting and screened circuit operation principle are as follows：From DC power source unit operation principle, in this single live wire
When total power touch switch circuit is in opening state, load current is by the 4th charging diode VD5 to the first storage capacitor
C3 is charged, when charging to the voltage on the first storage capacitor C3（VCC1）It is steady more than first threshold voltage-regulator diode VD3
When pressure value is with the 5th phase inverter U3-1 turning-on voltage sums, the 4th phase inverter U3-2 input is changed into high level, and output is changed into
Low level, and the 5th phase inverter U3-1 inputs are pulled down to low level, the 5th phase inverter U3-1 outputs are changed into high level, driven
Stabilized switch pipe V4 is turned on, namely the voltage of partial pressure branch road is zero, is gone here and there by hex inverter U5-4 and the 7th phase inverter U5-5
It is low level to connect output after forming the 3rd shaping circuit shaping, and the low level is made due to the 4th isolating diode VD14 isolation
With the 3rd storage capacitor C6 cannot pass through the 4th isolating diode VD14 electric discharges, and discharge current can only pass through the second discharge resistance
R8 delay releases.
When the voltage on the first storage capacitor C3 because the consumption of internal circuit is gradually reduced to the pole of first threshold voltage stabilizing two
Pipe VD3 voltage stabilizings value is turned off below voltage sum with the 5th phase inverter U3-1, and the input of the 4th phase inverter U3-2 is changed into low
Level, output end are changed into high level, and the 3rd isolating diode VD8 is by the 4th phase inverter U3-2 output end and the 5th phase inverter
U3-1 inputs are isolated, and due to the first pull-up resistor R20 be present, the 5th phase inverter U3-1 input inputs are changed into high electricity
Flat, output end is changed into low level, and stabilized switch pipe V4 recovers cut-off, and when civil power is positive half cycle, load current fills by the 4th
Electric diode VD5 recovers to charge to the first storage capacitor C3 again, goes round and begins again.
The branch pressure voltage of partial pressure branch road after the first divider resistance R10 and the first divider resistance R11 series connection is by zero liter
Up to high level, by hex inverter U5-4 and the 7th phase inverter U5-5 concatenation form the 3rd shaping circuit shaping after output by
Low level is changed into high level, goes round and begins again, and forms spike train, and the 3rd storage capacitor C6 is charged, width and the load electricity of pulse
The size of stream is inversely proportional, that is to say, that when load is heavy load, the width of pulse is smaller, is sufficient to compensate for the 3rd storage capacitor
C6 passes through the electric current of the second discharge resistance R8 releases, the upper voltage step-downs of the 3rd storage capacitor C6, and the first phase inverter U5-3 is exported and turned over
Switch to high level, first switch triode V3 conductings, relay KA adhesives, contact timing closing；Loaded conversely, working as small load
When, the width of pulse is larger, it is sufficient to supplements the electric current that the 3rd storage capacitor C6 passes through the second discharge resistance R8 releases, the 3rd energy storage
Voltage maintains high level on electric capacity C6, and the first phase inverter U5-3 output switching activities are low level, and first switch triode V3 ends, after
Electrical equipment KA dead electricity, contact is disconnected, and bidirectional thyristor VT1 is held on.
This single live wire total power touch switch circuit operation principle is as follows：In this circuit, the 3rd charging diode VD2 anodes
A wiring of one end L1 of end and the normally open contact parallel branch of connected bidirectional thyristor and relay as on-off circuit
End, another terminals of the negative pole end L of working power as on-off circuit.This circuit is serially connected in live wire together with load,
Under original state, civil power forms the first power source charges branch after the 3rd charging diode VD2 connects with the second current-limiting resistance R1
Charging of the road to the first storage capacitor C3, then exported after three terminal regulator U2 voltage stabilizings, it is body capacitance touch detection unit
Working power is provided with the 5th phase inverter U3-1 etc., now, the 5th phase inverter U3-1 input is due to the 3rd pull down resistor R3
Exist for low level, the 5th phase inverter U3-1 output end output high level, stabilized switch pipe V4 conductings.Body capacitance touches inspection
The initial output for surveying unit is high level, and the high level signal is fast to the 3rd storage capacitor C6 by the first charging diode VD10
Speed charges to high level, then upset is low level after the first phase inverter U5-3, and first switch triode V3 ends, relay
KA contacts remain open；Meanwhile the high level of body capacitance touch detection unit output passes through the second charging resistor R7 to second
Storage capacitor C5 charges to high level, then upset is low level after the second phase inverter U5-1, and the first amplifying triode V2 is cut
Only, photoelectrical coupler OP1 input sides do not have electric current, and outlet side does not have trigger current, bidirectional thyristor VT1 cut-offs, therefore loads
Upper no electric current.
After people touch a touch sheet M, the output of body capacitance touch detection unit is changed into low level, the second storage
High level in energy electric capacity C5 passes through the first discharge diode VD11 repid discharges to low level, then by the second phase inverter U5-1
Upset is high level afterwards, and the first amplifying triode V2 is turned on, and photoelectrical coupler OP1 input sides flow through electric current, and outlet side flows through tactile
Generated electricity stream, and bidirectional thyristor VT1 is turned on immediately prior to relay KA；Meanwhile the 3rd high level signal in storage capacitor C6 leads to
The second discharge resistance R8 delay releases are crossed to low level, then upset is high level after the first phase inverter U5-3, first switch
Triode V3 is turned on, relay KA delay adhesives, contact timing closing；Bidirectional thyristor VT1 is turned on and contact closure, therefore,
There is electric current in load.
After people touch touch sheet M again, the output of body capacitance touch detection unit is overturn again, is again height
Level, the high level signal by the first charging diode VD10 to the 3rd storage capacitor C6 quick charges to high level, then pass through
Upset is low level after crossing the first phase inverter U5-3, and first switch triode V3 ends, and relay KA contacts disconnect immediately；Together
When, the high level of body capacitance touch detection unit output is delayed by the second charging resistor R7 to the second storage capacitor C5 to charge
To high level, then upset is low level after the second phase inverter U5-1, and the first amplifying triode V2 ends, photoelectrical coupler
OP1 input sides do not have electric current, and outlet side does not have trigger current, and bidirectional thyristor VT1 ends after the disconnection of relay KA contacts, cut
The disconnected upper electric current of load.
Specific embodiment 2：
Although single live wire total power touch switch circuit in specific embodiment 1 has reached while has been adapted to the negative of high or low power
The purpose of load, when load is high power load, bidirectional thyristor VT1 and relay KA are simultaneously turned on, but answer preferred relay
Device KA is individually turned on, and bidirectional thyristor VT1 disconnects, and can so be reduced working direct current and be extended bidirectional thyristor VT1
Service life.In order to achieve the above object, as shown in Fig. 2 preferably also being set on the basis of specific embodiment 1 in this specific embodiment
There is lockout circuit.The lockout circuit includes the 3rd phase inverter U5-2, the 3rd RC charge-discharge circuit, the second discharge diode
VD13, the second charging diode VD9 and the first isolating diode VD12, the 3rd RC charge-discharge circuit include the first electric discharge electricity
R9, the 4th storage capacitor C7 are hindered, the 4th storage capacitor C7 is connected to the 3rd phase inverter U5-2 inputs and working power is born
Between pole, the second charging diode VD9 is connected to body capacitance touch detection unit output end and the 3rd phase inverter U5-2
Between input, the second charging diode VD9 anode is connected with body capacitance touch detection unit output end, and described first puts
The 3rd phase inverter U5-2 inputs and first switch triode are connected to after resistance R9 and the second discharge diode VD13 series connection
Between V3 output end, the second discharge diode VD13 negative electrodes and first switch triode V3 output end, which drain, to be connected, institute
The 3rd phase inverter U5-2 output ends are stated to be connected on the second phase inverter U5-1 inputs by the first isolating diode VD12.Set
3rd RC charge-discharge circuit be in order to ensure to have that time enough first allows relay KA normally open contact reliably to close after, then break
Open bidirectional thyristor VT1.
Lockout circuit operation principle is as follows：When the output of body capacitance touch detection unit is changed into low level, the 3rd storage
High level signal in energy electric capacity C6 is discharged to low level by the second discharge resistance R8 delays, then by the first phase inverter U5-3
Upset is high level afterwards, turns on first switch triode V3, after relay KA adhesive contact closures, in the 4th storage capacitor C7
High level signal by the first discharge resistance R9, the second discharge diode VD13 and first switch triode V3 delay release extremely
Low level, the 3rd phase inverter U5-2 outputs are changed into high level, and the high level is input to the by the first isolating diode VD12
On two phase inverter U5-1 inputs, so the second phase inverter U5-1 output low levels, the first amplifying triode V2 cut-offs, photoelectricity coupling
Clutch OP1 input sides do not have electric current, and outlet side does not have trigger current, bidirectional thyristor VT1 cut-offs, is advantageous to bidirectional thyristor
VT1 radiates, and increases the service life, and relay KA keeps adhesive, and contact continues to close, and path is provided for load current.
Specific embodiment 3：
This on-off circuit further comprises positive voltage zero passage charging control circuit on the basis of specific embodiment 1 or 2,
In this specific embodiment, also changed on the basis of specific embodiment 2 and be provided with positive voltage zero passage charging control circuit, as shown in figure 3,
The positive voltage zero passage charging control circuit includes comparator U4A, the 5th current-limiting resistance R2, the second pull-up resistor R16 and differential
Electric capacity C10, the inverting input of the comparator U4A are connected with working power negative pole, and the 5th current-limiting resistance R2 is connected to
Between 4th charging diode VD5 anodes and comparator U4A in-phase input end, the differential capacitance C10 is connected to comparator
Between U4A output end and the 5th phase inverter U3-1 inputs, the second pull-up resistor R16 be connected to working power positive pole and
Between comparator U4A output end.
Positive voltage zero passage charging control circuit operation principle is as follows：After someone touches the touch sheet M, body capacitance is touched
The output for touching detection unit is changed into low level, and stabilized switch pipe V4, bidirectional thyristor VT1 or relay KA are turned on, in load
There is electric current, when civil power switchs to positive half cycle from negative half period, the forward voltage drop on stabilized switch pipe V4 is changed into comparator U4A outputs
High level, the 5th phase inverter U3-1 inputs are made to be changed into high level by differential capacitance C10, output end is changed into low level, voltage stabilizing
Switching tube V4 ends, and load current charges by the 4th charging diode VD5 to the first storage capacitor C3, when charging to the
Voltage on one storage capacitor C3（VCC1）Voltage stabilizing value more than first threshold voltage-regulator diode VD3 is opened with the 5th phase inverter U3-1
During the pressure sum that is powered, the 4th phase inverter U3-2 input is changed into high level, and output is changed into low level, and by the 5th phase inverter
U3-1 inputs are pulled down to low level, and the 5th phase inverter U3-1 outputs are changed into high level, the V4 conductings of driving stabilized switch pipe, load
Electric current stops to the first storage capacitor C3 by bidirectional thyristor VT1 and/or the outflow of relay KA contacts and stabilized switch pipe V4
Charging.When civil power switchs to negative half period from positive half cycle, comparator U4A outputs are changed into low level, and differential capacitance C10 voltages are zero,
When civil power is returned to positive half cycle from negative half period, said process is repeated.
To, to the first storage capacitor C3 charging modes, its advantage is each charging in pre- mu balanced circuit in said process
It is in civil power since when negative half period switchs to positive half cycle, charging dash current is small, and during stopping charging, stabilized switch pipe V4
In the conduction state, pressure drop is low, and heating is few, and temperature rise is low, thus is advantageous to increase the service life, and work is relatively reliable.
Specific embodiment 4：
Due to special single channel capacitive touch switch integrated circuit, such as RH6030, TTP223, ASC0111B, SOT23-6
There is minimum operating current, only 2-9 μ A when power supply is 2.5-5V etc. integrated chip, be highly suitable for the list of low-power consumption
Live wire wall touch switch circuit, however, such special single channel capacitive touch switch integrated circuit is due to design
Treat that chip normally starts, it is necessary to power supply provides at the electric current of milliampere level in electrifying startup there is also a feature, i.e. chip
Afterwards, operating current can just be down to 2-9 μ A.In order to adapt to this kind of special single channel capacitive touch switch integrated circuit to power supply
Working power is provided it is required that can again be set on the basis of specific embodiment 1-3 and be individually for body capacitance touch detection unit
Detection unit independent current source.In this specific embodiment, on the basis of specific embodiment 3, list is additionally arranged in DC power source unit
The detection unit independent current source of working power is solely provided for body capacitance touch detection unit, as shown in figure 4, the detection unit
Independent current source includes the 8th phase inverter U3-3, the 9th phase inverter U3-4, feedback resistance R6, feedback capacity C2, the 4th current-limiting resistance
R5 and Second Threshold voltage-regulator diode VD4, the 8th phase inverter U3-3 and the 9th phase inverter U3-4 are connected in series, the feedback
Electric capacity C2 is connected between the 8th phase inverter U3-3 inputs and working power negative pole, and it is anti-that the feedback resistance R6 is connected to the 8th
Positive feedback, the 4th current-limiting resistance R5 and the second threshold are formed between phase device U3-3 inputs and the 9th phase inverter U3-4 output ends
It is connected to after value voltage-regulator diode VD4 series connection between the 8th phase inverter U3-3 inputs and the first storage capacitor C3 positive terminal,
Second Threshold voltage-regulator diode VD4 negative electrodes are connected on the first storage capacitor C3 positive terminal, and the 9th phase inverter U3-4 is defeated
Go out end and provide working power for body capacitance touch detection unit.
Detection unit independent current source operation principle is as follows：Switch on power when this circuit is serially connected in live wire together with load
Afterwards, civil power is by the 3rd charging diode VD2, the second current-limiting resistance R1, the first storage capacitor C3 positive terminal in series the
One power source charges branch road charges to the first storage capacitor C3, when voltage on the first storage capacitor C3（VCC1）Not up to set
During value, the 8th phase inverter U3-3 inputs are low level, and the 9th phase inverter U3-4 outputs are also low level, detection unit independent electrical
Source is without output, idle；When voltage on the first storage capacitor C3（VCC1）When reaching setting value, by the positive and negative of feedback resistance R6
Feedback, the 8th phase inverter U3-3 inputs quickly switch to high level, and the 9th phase inverter U3-4 outputs are also high level, and list is specialized in output
The operating voltage VCC4 of channel capacitor soft-touch control integrated circuit.Detection unit independent current source make use of the first energy storage of Large Copacity
Electric capacity C3 is that small capacitances C13 charges to provide starting current required when single channel capacitive touch switch integrated circuit starts, electricity
The simple cost of flow structure is low.
In order to further reduce the operating current of holding state, stand-by energy-saving circuit, institute are additionally provided with this specific embodiment
Stating stand-by energy-saving circuit includes second switch triode V5, base resistance R19, the second switch triode V5 emitter stages and institute
The working power positive pole connection of body capacitance touch detection unit is stated, second switch triode V5 base stages pass through base resistance R19
It is connected with the output end of body capacitance touch detection unit, the second switch triode V5 colelctor electrodes are described as output end
Comparator U4A provides working power.By setting the stand-by energy-saving circuit, comparator U4A is only in body capacitance touch detection
Unit just has working power when having by touch conducting state, reduces standby current.
For indivedual special loads, when such as load is inductance type fluorescent lamp, this circuit may can also have starter process
In can cause the first storage capacitor C3 voltages decline, cause the output voltage of the smart mu balanced circuit unstable, cause whole electricity
The not normal phenomenon of road work.As shown in figure 4, in order to solve this problem, in this specific embodiment, in first storage capacitor
The 5th isolating diode, the three terminal regulator U2 inputs and work are also serially connected between C3 and three terminal regulator U2 inputs
The 5th storage capacitor C4 is parallel between power cathode.Certainly, any one in the similarly suitable specific embodiment 1-3 of this scheme
Kind specific embodiment, and reach same effect.
In order to avoid this total power switch uses single high power relay to causing to switch to adapt to high power load
Box excessive height, and reduce the species of circuit pcb board, be preferably provided with this single live wire total power touch switch circuit it is multiple after
Electrical equipment KA, the multiple relay KA are to be arranged in parallel.
Claims (10)
1. a kind of single live wire total power touch switch circuit, including DC power source unit, body capacitance touch detection unit, string are set
Main switch element and main switch element control unit in main circuit, it is characterised in that：The main switch element includes one
Individual bidirectional thyristor, a relay, go here and there after the normally open contact parallel connection of the bidirectional thyristor and relay and are located in main circuit；
The main switch element control unit includes thyristor control circuit, control relay circuit and load detecting and screened circuit,
The body capacitance touch detection unit output end is connected with the input of thyristor control circuit and control relay circuit；Institute
Stating load detecting and screened circuit includes a sampling capacitance being serially connected in main circuit, by detecting load current by energy storage electricity
Capacity charge to the time for setting magnitude of voltage judges that on-off circuit loads, under small load condition, the load detecting and shielding electricity
Road shields the body capacitance touch detection unit and exported to the opening control signal of control relay circuit input.
2. single live wire total power touch switch circuit according to claim 1, it is characterised in that：The body capacitance touches
Detection unit is made up of condenser input circuit and capacitance touch detection circuit, and the condenser input circuit is by touch sheet and triggering spirit
Sensitivity regulation electric capacity composition, trigger sensitivity regulation electric capacity one terminate power cathode, and the other end is connected and same with touch sheet
The output end of Shi Zuowei condenser input circuits；The capacitance touch detection circuit is by single channel capacitive touch switch integrated circuit
Bistable circuit for core composition is formed, when the capacitance touch detects the input end capacitor increase of circuit, output end level
Upset；
The DC power source unit includes charging circuit, pre- mu balanced circuit and smart mu balanced circuit, the pre- mu balanced circuit switching control
Load detecting circuit in circuit processed includes the first storage capacitor, stabilized switch pipe, the 4th phase inverter, the 5th phase inverter, the 3rd
Pull down resistor, first threshold voltage-regulator diode and the 3rd isolating diode, the stabilized switch pipe are FET, the voltage stabilizing
String is located at main electricity after the source electrode of switching tube and drain electrode are connected with the normally open contact parallel branch of the bidirectional thyristor and relay
Lu Zhong, the second pull down resistor, the first threshold are connected between the input and working power negative pole of the 4th phase inverter
Voltage-regulator diode is connected between the input of the 4th phase inverter and the first storage capacitor positive terminal, first threshold voltage-regulator diode
Negative electrode be connected with the first storage capacitor positive terminal, the 3rd isolating diode is connected to the output end of the 4th phase inverter and the
Between five inverter inputs, the 3rd pull down resistor is connected between the 5th inverter input working power negative pole, the
Five inverter outputs are connected with stabilized switch tube grid；The smart mu balanced circuit includes filter capacitor, three terminal regulator and the
One storage capacitor, the filter capacitor are connected between three terminal regulator output end and working power negative pole, first energy storage
Capacitance connection is in three terminal regulator input；The charging circuit includes the 3rd charging diode, the 4th charging diode, second
Current-limiting resistance, the 3rd charging diode are connected to the normally open contact of bidirectional thyristor and relay after being connected with the second current-limiting resistance
The first power source charges branch road, the 4th charging diode sun are formed between the positive terminal of one end of parallel branch and the first storage capacitor
Pole is connected to the other end of the normally open contact parallel branch of bidirectional thyristor and relay, and the 4th charging diode negative pole is connected to
The positive terminal of first storage capacitor forms second source charging paths；
Control relay circuit in the main switch element control unit includes first switch triode and anti-phase by Schmidt
Device form the first shaping circuit, the relay coil be connected to after being connected with first switch triode working power the two poles of the earth it
Between, the first pull down resistor is connected between the control pole and power cathode of the first switch triode and forms the relay drive
Dynamic circuit, the first shaping circuit output end are connected with the control pole of first switch triode, and the first RC charge-discharge circuit is
Slow play fast charge charge-discharge circuit, is arranged on the first shaping circuit input, and first RC charge-discharge circuit includes the second electric discharge
Resistance, the 3rd storage capacitor and the first charging diode, the 3rd storage capacitor be connected to the first shaping circuit input and
Between working power negative pole, body capacitance touch detection is connected to after second discharge resistance and the first charging diode parallel connection
Between unit output end and the first shaping circuit input, the first charging diode anode tap and body capacitance touch detection unit
Output end connects；
Thyristor control circuit in the main switch element control unit includes the first amplifying triode, photoelectrical coupler, the
One current-limiting resistance and the second shaping circuit being made up of schmitt inverter, the photoelectrical coupler input side and the first amplification three
It is connected to after pole pipe and the series connection of the first current-limiting resistance between working power the two poles of the earth, the outlet side triggering of the photoelectrical coupler is two-way
IGBT group pole, the first amplifying triode pole connect and compose the triggers circuit with the second shaping circuit output end；The
Two RC charge-discharge circuits fill charge-discharge circuit to slow down soon, are arranged on the second shaping circuit input, the 2nd RC discharge and recharges
Circuit includes the second charging resistor, the second storage capacitor and the first discharge diode, second charging resistor and the first electric discharge
Diodes in parallel and be connected to after the second storage capacitor body capacitance touch detection unit output end and working power negative pole it
Between, the first discharge diode negative electrode is connected with body capacitance touch detection unit output end, second charging resistor and first
Discharge diode parallel branch is connected with the tie point of the second storage capacitor by input resistance with the second shaping circuit input；
Load detecting and screened circuit include first storage capacitor, the first divider resistance, the second divider resistance, by Schmidt
The 3rd shaping circuit, the 4th isolating diode and the 3rd current-limiting resistance that phase inverter is formed, first storage capacitor are made simultaneously
For sampling capacitance, the 4th charging diode anode and work are connected to after the first divider resistance and the second divider resistance series connection
Between power cathode, the dividing point of the partial pressure branch road is connected with the input of the 3rd shaping circuit, the 3rd shaping circuit
Output end be connected by the 4th isolating diode and the 3rd current-limiting resistance with the first shaping circuit input.
3. single live wire total power touch switch circuit according to claim 2, it is characterised in that：It is additionally provided with lockout circuit,
The lockout circuit includes the 3rd phase inverter, the 3rd RC charge-discharge circuit, the second discharge diode, the second charging diode and the
One isolating diode, the 3rd RC charge-discharge circuit include the first discharge resistance, the 4th storage capacitor, the 4th energy storage electricity
Appearance is connected between the 3rd inverter input and working power negative pole, and second charging diode is connected to body capacitance and touched
Touch between detection unit output end and the 3rd inverter input, anode and the body capacitance touch detection of the second charging diode
Unit output end connects, be connected to after first discharge resistance and the second discharge diode series connection the 3rd inverter input and
Between the output end of first switch triode, the second discharge diode negative electrode is connected with the output end of first switch triode, institute
The 3rd inverter output is stated to be connected on the second inverter input by the first isolating diode.
4. single live wire total power touch switch circuit according to claim 2, it is characterised in that：The photoelectrical coupler is
No-voltage conducting type photoelectrical coupler.
5. single live wire total power touch switch circuit according to claim 2, it is characterised in that：The stabilized switch pipe is
Low-voltage driving FET.
6. single live wire total power touch switch circuit according to claim 2, it is characterised in that：Also include being individually for human body
Capacitance touch detection unit provides the detection unit independent current source of working power, and it is anti-that the detection unit independent current source includes the 8th
Phase device, the 9th phase inverter, feedback resistance, feedback capacity, the 4th current-limiting resistance and Second Threshold voltage-regulator diode, the described 8th is anti-
Phase device and the connection of the 9th inverter series, the feedback capacity be connected to the input of the 8th phase inverter 3 and working power negative pole it
Between, the feedback resistance, which is connected between the 8th inverter input and the 9th inverter output, forms positive feedback, and described
Four current-limiting resistances are being connected to the 8th inverter input and the first storage capacitor just after being connected with Second Threshold voltage-regulator diode
Between extreme, Second Threshold voltage-regulator diode negative electrode is connected on the positive terminal of the first storage capacitor, and the 9th phase inverter is defeated
Go out end and provide working power for body capacitance touch detection unit.
7. single live wire total power touch switch circuit according to claim 2, it is characterised in that：Also include positive voltage zero passage
Charging control circuit, the positive voltage zero passage charging control circuit include comparator, the 5th current-limiting resistance, the second pull-up resistor and
Differential capacitance, the inverting input of the comparator are connected with working power negative pole, and the 5th current-limiting resistance is connected to the 4th
Between charging diode anode and the in-phase input end of comparator, the differential capacitance is connected to the output end and the 5th of comparator
Between inverter input, second pull-up resistor is connected between working power positive pole and the output end of comparator.
8. single live wire total power touch switch circuit according to claim 2, it is characterised in that：It is additionally provided with stand-by energy-saving electricity
Road, the stand-by energy-saving circuit include second switch triode, base resistance, the second switch transistor emitter with it is described
The working power positive pole connection of body capacitance touch detection unit, second switch transistor base is by base resistance and human body electricity
Hold the output end connection of touch detection unit, the second switch transistor collector provides work as output end for comparator
Power supply.
9. single live wire total power touch switch circuit according to claim 2, it is characterised in that：First storage capacitor
The 5th isolating diode is also serially connected between three terminal regulator input, the three terminal regulator input is born with working power
The 5th storage capacitor is parallel between pole.
10. single live wire total power touch switch circuit according to claim 2, it is characterised in that provided with multiple relays,
The multiple relay is to be arranged in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720306480.3U CN206923111U (en) | 2017-03-27 | 2017-03-27 | A kind of single live wire total power touch switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720306480.3U CN206923111U (en) | 2017-03-27 | 2017-03-27 | A kind of single live wire total power touch switch circuit |
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| CN206923111U true CN206923111U (en) | 2018-01-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879147A (en) * | 2017-03-27 | 2017-06-20 | 刘冰冰 | A kind of single live wire total power touch switch circuit |
| CN109450421A (en) * | 2018-12-17 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of analog switch opens circuit and method |
| CN110337162A (en) * | 2019-04-28 | 2019-10-15 | 天彩电子（深圳）有限公司 | Single live wire power getting system and method based on intelligent switch |
| CN110461061A (en) * | 2019-08-12 | 2019-11-15 | 天津华来科技有限公司 | A kind of single live wire power getting circuit controlled based on microswitch or optocoupler |
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2017
- 2017-03-27 CN CN201720306480.3U patent/CN206923111U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879147A (en) * | 2017-03-27 | 2017-06-20 | 刘冰冰 | A kind of single live wire total power touch switch circuit |
| CN106879147B (en) * | 2017-03-27 | 2023-08-29 | 刘冰冰 | Single-live-wire full-power touch switch circuit |
| CN109450421A (en) * | 2018-12-17 | 2019-03-08 | 上海艾为电子技术股份有限公司 | A kind of analog switch opens circuit and method |
| CN109450421B (en) * | 2018-12-17 | 2023-09-01 | 上海艾为电子技术股份有限公司 | Analog switch starting circuit and method |
| CN110337162A (en) * | 2019-04-28 | 2019-10-15 | 天彩电子（深圳）有限公司 | Single live wire power getting system and method based on intelligent switch |
| CN110461061A (en) * | 2019-08-12 | 2019-11-15 | 天津华来科技有限公司 | A kind of single live wire power getting circuit controlled based on microswitch or optocoupler |
| CN110461061B (en) * | 2019-08-12 | 2024-04-09 | 天津华来科技股份有限公司 | Single-live wire circuit based on micro switch or optocoupler control |
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