CN108134273A - The safety electric outlet circuit of low pressure detection control - Google Patents
The safety electric outlet circuit of low pressure detection control Download PDFInfo
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- CN108134273A CN108134273A CN201711297161.1A CN201711297161A CN108134273A CN 108134273 A CN108134273 A CN 108134273A CN 201711297161 A CN201711297161 A CN 201711297161A CN 108134273 A CN108134273 A CN 108134273A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6666—Structural association with built-in electrical component with built-in electronic circuit with built-in overvoltage protection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6683—Structural association with built-in electrical component with built-in electronic circuit with built-in sensor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
Abstract
The present invention relates to a kind of safety electric outlet circuit of low pressure detection control, including D.C. regulated power supply, voltage detecting circuit and power supply delayed start-up circuit.Voltage detecting circuit uses the partial pressure branch for including being connected in series by dropping resistor and divider resistance in the safety electric outlet circuit of low pressure detection control of the present invention, and the dropping resistor is serially connected between the power firestreak L input terminals of socket and the firewire jack L1 electrodes of socket, the partial pressure branch both ends are connected on the firewire jack L1 electrodes and zero line jack N1 electrodes of socket, voltage on the jack of socket is down to 20V, as safe voltage, even if two electrodes that therefore both hands are encountered simultaneously inside jack will not be dangerous, safety is very high.
Description
Technical field
The present invention relates to safety electric outlet circuit, the safety electric outlet circuit of specifically a kind of low pressure detection control.
Background technology
In order to ensure personal safety and fire incident is avoided, country has expressly provided inaccurate production and selling Multifunctional inserting
Seat can only use the safety socket for meeting national Specification.Safety socket currently on the market is all protected substantially using mechanical
Although shield mode, this kind of safety socket have certain protecting effect, but still not satisfactory, are primarily present following drawback：
1st, children from getting electric shock in order to prevent, is usually used mechanical means so that reinforcing can just power on or be used simultaneously using diplopore
Power, the mode that jack is just opened, but the intelligences such as this is for being grown up, children, mental patient that strength is big are not complete but have enough power
The crowd of amount, there are still security risks；2nd, since mechanical system is compact-sized, mechanism is complicated, by it is long-term, be used for multiple times after hold
It easily breaks down, it becomes difficult to plug, some users is caused directly to remove mechanical safety device, lose safeguard protection work
With；3）Although each manufacturer all provides and designate the permitted maximum operating currenbt of socket, most of user does not know
Whether the real work electric current of the loads such as the family heaters such as electric cooker, electromagnetic oven, micro-wave oven, when use can be more than at all unclear
Chu, it is therefore more likely that socket can be allowed to be in the operation of overload state, this can not only accelerate contact aging, fever that plastic housing is caused to become
Shape affects the reliability and service life of contact, can also electric wire fever, initiation fire and personal safety thing when situation is serious
Therefore.
Since safety mechanical socket has these, also there is electronic safety socket.Existing electronics
The method detection load electricity that the safety electric outlet circuit used in formula safety socket is generally connected using load with sample resistance
Stream.In the case that the advantages of this detection method is human body touch firewire, electric current will not be produced without current sampling resistor
It gives birth to starting current and powers on, reach protection purpose.But this circuit structure form is there is also defect, such as：Work as human body resistance
The high pressure much larger than safe voltage will be had when larger, on human body, in addition human body both hands touch firewire L1 and zero curve N1 and incite somebody to action simultaneously
There is the danger of electric shock, safety is not high；The voltage change unobvious that sample resistance detects during load impedance significant change, to mistake
Loading with load can not accurately detect, it is difficult to it protects, meanwhile, in order to improve detection sensitivity, sample resistance resistance value is often larger, therefore
The relay of one sample resistance short circuit of increase is also needed after power initiation.
Invention content
It is an object of the invention in order to overcome the deficiencies of the prior art and provide a kind of circuit structure simple, reliable operation and
The better safety electric outlet circuit of safety.
In order to achieve the above object, it is special the present invention provides a kind of safety electric outlet circuit of low pressure detection control
Sign is：Including D.C. regulated power supply, voltage detecting circuit and power supply delayed start-up circuit, the voltage detecting circuit include by
The partial pressure branch that dropping resistor and divider resistance are connected in series, the dropping resistor are serially connected in the power firestreak L input terminals of socket
Between the firewire jack L1 electrodes of socket, the partial pressure branch both ends are connected to the firewire jack L1 electrodes and zero of socket
On line jack N1 electrodes, it is electrically connected between the zero-power line N input terminals of socket and the zero line jack N1 electrodes of socket, the decompression
The sum of resistance value of resistance and divider resistance is more than 1M Ω, and the resistance value ratio between the dropping resistor and divider resistance is 10:1-15:
1, the divider resistance is connected in series by the first divider resistance and the second divider resistance, first divider resistance and the second partial pressure
Output signal of the voltage for voltage detecting circuit between the dividing point A of resistance and the zero-power line N input terminals of socket, the inspection
Output signal end is surveyed to connect with power supply delayed start-up circuit input end；The power supply delayed start-up circuit includes one and opens relay
KA and its delay driving circuit, the normally opened contact for opening relay KA are connected in parallel on the dropping resistor both ends, the detection
When output signal is high level, delay driving circuit disconnects the unlatching relay KA coil losing electricities, the detection output letter
When number being low level, delay driving circuit makes the unlatching relay KA coils be delayed to obtain electric actuation；The D.C. regulated power supply
DC supply is provided for power supply delayed start-up circuit.
Voltage detecting circuit, which uses, in the safety electric outlet circuit of low pressure detection control of the present invention is included by dropping resistor
The partial pressure branch being connected in series with divider resistance, and the dropping resistor is serially connected in the power firestreak L input terminals of socket and is inserted
Between the firewire jack L1 electrodes of seat, the partial pressure branch both ends are connected to the firewire jack L1 electrodes of socket and zero curve is inserted
On the N1 electrodes of hole, voltage on the jack of socket is down to 20V, becomes safe voltage, therefore even if both hands are encountered in jack simultaneously
Two electrodes in portion will not be dangerous, and safety is very high.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Description of the drawings
Attached drawing 1 is voltage detecting circuit specific embodiment electrical schematic diagram of the present invention；
Attached drawing 2 is power supply delayed start-up circuit specific embodiment electrical schematic diagram of the present invention；
Attached drawing 3 is the unloaded automatic shutdown circuitry specific embodiment electrical schematic diagram of the present invention；
Attached drawing 4 starts overload and short-circuit protection circuit specific embodiment electrical schematic diagram for the present invention；
Attached drawing 5 is operating overload of the present invention and short-circuit protection circuit specific embodiment electrical schematic diagram；
Attached drawing 6 resets reset circuit specific embodiment electrical schematic diagram for the present invention；
Attached drawing 7 is direct current regulation circuit specific embodiment electrical schematic diagram of the present invention.
Specific embodiment
The safety electric outlet circuit of low pressure detection control of the present invention includes D.C. regulated power supply, voltage detecting circuit and electricity
Source delayed start-up circuit, the D.C. regulated power supply provide DC operation electricity for power supply delayed start-up circuit and other circuits
Source.
As shown in Figure 1, the voltage detecting circuit includes the partial pressure branch being connected in series by dropping resistor and divider resistance,
The dropping resistor is serially connected between the power firestreak L input terminals of socket and the firewire jack L1 electrodes of socket, the partial pressure branch
Road both ends are connected on the firewire jack L1 electrodes and zero line jack N1 electrodes of socket, the zero-power line N input terminals of socket
It is electrically connected between the zero line jack N1 electrodes of socket.In order to ensure safety and take into account detection sensitivity, the dropping resistor with
The sum of resistance value of divider resistance should select suitable range, this specific embodiment, and the dropping resistor takes 1M Ω, the decompression
Resistance value ratio between resistance and divider resistance is 10:1, floating voltage is down to 20V or so between two jacks of such socket.This is specific
In embodiment, the divider resistance is connected in series by the first divider resistance R3 and the second divider resistance R4, the first partial pressure electricity
Hinder the R3 and dividing point A of the second divider resistance R4 and N of socket（Zero curve）Voltage between power input is voltage detecting electricity
The output signal on road, the detection output signal end are connect with power supply delayed start-up circuit input end A.
The power supply delayed start-up circuit includes one and opens relay KA and its delay driving circuit, the unlatching relay
The normally opened contact of KA is connected in parallel on the dropping resistor both ends, in this embodiment, when unloaded, passes through the described first partial pressure electricity
The partial pressure of R3 and the second divider resistance R4 is hindered, the level of dividing point A high electricity occurs in 2V or so namely the detection output signal
It is flat, at this point, corresponding delay driving circuit disconnects the unlatching relay KA coil losing electricities, when connecting load, dividing point A's
Level in 0.5V hereinafter, namely the detection output signal be all low level, at this point, corresponding delay driving circuit makes the unlatching
Relay KA coils are delayed to obtain electric actuation.Delay driving circuit particular circuit configurations are not specially required, can there are many
Circuit form, as long as meeting above-mentioned requirements.
As shown in Fig. 2, in this specific embodiment, the power supply delayed start-up circuit includes incoming level and differentiates circuit and prolong
When driving circuit；The incoming level differentiates that circuit includes time delay resistance R6 and NPN type first switch triode T1, the delay
Resistance R6 is connected between the collector of first switch triode T1 and positive pole Vcc, the first switch triode T1's
Emitter is connected to power cathode, and delay capacitor is parallel between the collector and emitter of the first switch triode T1
C2, the time delay resistance R6 and delay capacitor C2 form delay charging paths, and the base stage of the first switch triode T1 is electricity
Source delayed start-up circuit input end A；The delay driving circuit includes the first phase inverter U1-1 and positive-negative-positive second switch triode
T2, the unlatching relay KA coils are connected between the collector and power cathode of second switch triode T2, and described second
The emitter of switching transistor T2 is connected to positive pole Vcc, the input terminal of the first phase inverter U1-1（That is delay and running electricity
The input terminal E on road）It is connect by the first current-limiting resistance R7 with the collector of first switch triode T1, first phase inverter
The output terminal of U1-1 is connect by the second current-limiting resistance R9 with the base stage of second switch triode T2, the second switch triode
The first feedback resistance R8 and the first feedback diode VD3 is connected between the input terminal of the collector of T2 and the first phase inverter U1-1
Series arm forms the delay driving circuit.
In order to further improve the security, the dropping resistor is preferably divided into the series connection of more than one resistance, to avoid use
Occur resistance failure during single resistance to turn on, lead to Danger Electric shock risk, therefore dropping resistor is electric by the first decompression in the present embodiment
Resistance R1 and the second dropping resistor R2 is connected in series, and can improve reliability safely.
The operation principle of the safety electric outlet circuit of this low pressure detection control is as follows：
During voltage detecting circuit zero load, by the decompression of dropping resistor, the voltage near about 20V at the both ends of branch is divided, it is described
The partial pressure of first divider resistance R3 and the second divider resistance R4, the level of dividing point A is in 2V or so namely the detection output letter
Number it is far above the dead zone voltage of 0.5V, the level of dividing point A is confirmed as high level, which is input to delay driving circuit
The base stage of middle first switch triode T1, first switch triode T1 are connected, fast because discharging, and charging is slow, delay capacitor C2
It discharges for low level, the output high level of the first phase inverter U1-1, the second switch triode T2 cut-offs, the unlatching
Relay KA coil losing electricities, normally opened contact KA1 are disconnected so that voltage is maintained at the safe voltage of 20V or so on the jack of socket
Range.And low-pressure state human body resistance is at least more than 100k Ω, at this time if someone accidentally touches the electrode in jack, dividing point A
Level still much larger than 0.5V dead zone voltages namely the detection output signal still for high level, the unlatching relay KA lines
Dead electricity is enclosed, normally opened contact KA1 is disconnected so that voltage is maintained at the safe voltage range of 20V or so on the jack of socket, does not have
Danger Electric shock risk achievees the purpose that safeguard protection.
And when insertion more than 1W upper in socket is loaded, since the impedance of load is much smaller than divider resistance, by decompression electricity
Resistance decompression and the partial pressure of the first divider resistance R3 and the second divider resistance R4, the level of dividing point A always in 0.5V hereinafter, namely
The detection output signal is low level, which is input to the base stage of first switch triode T1 in delay driving circuit,
First switch triode T1 ends, and delay capacitor C2 charges by time delay resistance R6, gradually becomes high level, first reverse phase
The output low level of device U1-1, the second switch triode T2 conductings, the unlatching relay KA coils obtain electric, normally opened contact
KA1 be closed so that the jack of socket powers on, in load it is electric.
In order to further improve circuit, it is ensured that can restore to safe voltage state, this power supply peace removing load rear socket
Full socket circuit is additionally provided with unloaded automatic shutdown circuitry.It is described zero load automatic shutdown circuitry include load detecting unit and compare and
Delay block unit, the load detecting unit test socket operating current, the output terminal of load detecting unit compared with and prolong
When block unit input terminal connection, the comparison and delay block unit output terminal by line and in a manner of with delay and running electricity
First inverter input E connections in road, when the socket operating current is less than preset value, the comparison and delay block unit
Output terminal output low level.
As shown in figure 3, in this specific embodiment, the load detecting unit includes current transformer LH1, current transformer
LH1 primary is connected on the power input line between the zero-power line N input terminals of socket and the zero line jack N1 electrodes of socket, described
Compare and the block unit that is delayed includes first comparator U2-1, the second phase inverter U1-2 and RC delay circuit, first comparator U2-
1 uses OC output type comparators, and the output terminal of first comparator U2-1 connects through discharge resistance and the second phase inverter U1-2 input terminals
It connects, the in-phase input end of first comparator U2-1 is equipped with provides comparison reference by the bleeder circuit that resistance R13 and resistance R14 are formed
Level is parallel with the first anti-saturation diode VD1 on the output terminal of current transformer LH1, the second anti-saturation diode VD2, takes
The output terminal of sample resistance R5 and anti-interference capacitor C1, current transformer LH1 are connect with the inverting input of first comparator U2-1,
The output terminal of first comparator U2-1 is connect through discharge resistance R15 with the second phase inverter U1-2 input terminals, the RC delay circuits
In series by time delay resistance and delay capacitor, the midpoint of the RC delay circuits is connect with the second phase inverter U1-2 input terminals,
The other end of delay capacitor is connect with power cathode, the other end of the time delay resistance and the current collection of second switch triode T2
Pole, the output terminal of the second phase inverter U1-2 are connect with the cathode of the first isolating diode VD5, the first isolating diode VD5
Anode connect as the output terminal of unloaded automatic shutdown circuitry with power supply delayed start-up circuit input end E.
The operation principle of unloaded automatic shutdown circuitry is as follows：
When load is normally plugged on socket, as previously described, since the impedance of load is much smaller than divider resistance, by decompression
Resistance is depressured and the partial pressure of the first divider resistance R3 and the second divider resistance R4, the level of dividing point A always in 0.5V hereinafter,
I.e. described detection output signal is low level, which is input to the base of first switch triode T1 in delay driving circuit
Pole, first switch triode T1 cut-offs, delay capacitor C2 gradually become high level by time delay resistance R6 chargings, and described first
The output low level of phase inverter U1-1, second switch triode T2 conducting, the unlatching relay KA coils obtain it is electric, it is normally opened
Contact KA1 be closed so that the jack of socket powers on, in load it is electric.Meanwhile on the output terminal of current transformer LH1
Induced voltage is more than the datum on first comparator U2-1 in-phase input ends, first comparator in unloaded automatic shutdown circuitry
U2-1 exports low level, and the second phase inverter U1-2 output high level by the isolation of the first isolating diode VD5, does not have
Block is formed to the input terminal of the first phase inverter U1-1 in the power supply delayed start-up circuit, it will not be impacted.
After load is removed from socket, then the induced voltage on the output terminal of current transformer LH1 is less than unloaded automatic pass
Datum in electromechanical road on first comparator U2-1 in-phase input ends, first comparator U2-1 output high level, second is anti-
Phase device U1-2 exports low level, is pulled down by the first isolating diode VD5, and first is anti-in the power supply delayed start-up circuit
The input terminal of phase device U1-1 forms block for low level, and the output terminal of the first phase inverter U1-1 is high level, the unlatching relay
Device KA coil losing electricities, normally opened contact KA1 are disconnected so that and voltage reverts to the safe voltage range of 20V or so on the jack of socket,
It is returned to original state.
The electric spark generated with startup power supply under short-circuit condition is overloaded in order to prevent, is preferably also provided in this specific embodiment
Start overload and short-circuit protection circuit.As shown in figure 4, overload and the short-circuit protection circuit of starting includes the second comparator U2-2
OC output type comparators, the in-phase input end of the second comparator U2-2 are used with third phase inverter U1-3, the second comparator U2-2
There is provided comparison reference level equipped with the bleeder circuit that is made of resistance R18 and resistance R19, the zero-power line N input terminals of socket with
Voltage between the firewire jack L1 of socket is inputted as the inverting input of the second comparator U2-2, i.e., firewire jack L1 ends pass through
The inverting input that the 4th current-limiting resistance R17 is connected to the second comparator U2-2 is crossed, selects the voltage signal as sampled signal,
Small signal can more be experienced.Damage the second comparator U2-2 in order to prevent, on the inverting input of the second comparator U2-2 simultaneously
The first limiter diode VD6, the second limiter diode VD7 and anti-interference capacitor C4 are associated with, the second comparator U2-2's is defeated
Outlet is connect by third current-limiting resistance R20 with third phase inverter U1-3 input terminals, the output terminal of third phase inverter U1-3 and
The cathode connection of two isolating diode VD8, the anode of the second isolating diode VD8 start overload and short circuit guarantor as described
The output terminal of protection circuit by line and in a manner of and delay driving circuit in the first phase inverter U1-1 input terminals E connections, the third
Be connected with the second charging capacitor C5 between phase inverter U1-3 input terminals and power cathode, the third phase inverter U1-3 input terminals with
The resistance of the second charging resistor R21, the second charging resistor R21 and third current-limiting resistance R20 is connected between positive pole Vcc
Value is than about 20:1, to ensure that electric discharge is fast, charging is slow.
The operation principle for starting overload and short-circuit protection circuit is as follows：
Under normal operating conditions, the inverting input of the second comparator U2-2 level in alternating current positive half cycle is higher than the second comparator
The in-phase input end datum of U2-2, the second comparator U2-2 output low levels, although working power is through the second charging resistor
R21 charges to the second charging capacitor C5, but since the resistance value of third current-limiting resistance R20 is much smaller than the second charging resistor R21 resistance values,
Discharge current is more than charging current, therefore the third phase inverter U1-3 input terminals are still low level, and third phase inverter U1-3 is defeated
Go out for high level, do not influence the work of other circuits；When occurring overloading or during short circuit phenomenon, the reverse phase of the second comparator U2-2 is defeated
Enter to hold level to be consistently lower than the in-phase input end datum of the second comparator U2-2, the second comparator U2-2 exports OC and cuts
Only, working power charges through the second charging resistor R21 to the second charging capacitor C5, and does not have discharge path, therefore the third
Phase inverter U1-3 input terminals are high level, and third phase inverter U1-3 outputs are low level, by the low of the second isolating diode VD8
Clamping blocks, and power supply delayed start-up circuit can not start, and the unlatching relay KA coil losing electricities, normally opened contact KA1 breaks
It opens, the output of socket non-transformer.
In order to further improve the security, operating overload and short-circuit protection circuit are preferably also provided in this specific embodiment.
As shown in figure 5, the operating overload and short-circuit protection circuit include comparing unit, comparing unit include third comparator U2-3 and
The in-phase input end of third isolating diode VD10, third comparator U2-3 are equipped with the partial pressure being made of resistance R23 and resistance R24
Circuit provides comparison reference level, and the inverting input of third comparator U2-3 is equipped with bleeder circuit input and the zero curve of socket is inserted
The relevant voltage signal of hole N1 electrodes, specifically by resistance R22 and resistance the R0 bleeder circuit formed be connected to positive pole Vcc with
Between the zero line jack N1 electrodes of socket, dividing point is connect with the inverting input of third comparator U2-3, third comparator U2-
Anti-interference capacitor C6 is preferably also provided between 3 inverting input and power cathode.It is set on the output terminal of third comparator U2-3
There is pull-up resistor R26, connection is equipped between the output terminal of third comparator U2-3 and the in-phase input end of third comparator U2-3
There are the second feedback resistance R25 and the positive feedback branch of the second feedback diode VD9 series arms composition, third comparator U2-3's
Output terminal is connect with the cathode of third isolating diode VD10, and the anode of the third isolating diode VD10 is as the operation
The output terminal of overload and short-circuit protection circuit by line and in a manner of connect with delayed start-up circuit input end E.
The operation principle of operating overload and short-circuit protection circuit is as follows：
Under normal operating conditions, third comparator U2-3's after the bleeder circuit partial pressure being made of resistance R23 and resistance R24 is same
Phase input terminal level is slightly above the reverse phase of the third comparator U2-3 after being divided by the bleeder circuit that resistance R22 and resistance R0 are formed
Input terminal level, third comparator U2-3 output high level, by the isolation of the third isolating diode VD10, not to institute
The input terminal for stating the first phase inverter U1-1 in power supply delayed start-up circuit forms block, it will not be impacted.When in operation
Occur overloading suddenly and during short circuit phenomenon, the inverting input level of third comparator U2-3 rises, and higher than third comparator
The in-phase input end level of U2-3, third comparator U2-3 output low levels, by the low of the third isolating diode VD10
Voltage clamping blocks, and power supply delayed start-up circuit can not start, and the unlatching relay KA coil losing electricities, normally opened contact KA1 breaks
It opens, the output of socket non-transformer.Power supply is cut off rear self- recoverage in order to prevent, in the operating overload and short-circuit protection circuit also
There is provided the positive feedback branch being made of the second feedback resistance R25 and the second feedback diode VD9 series arms, compare in third
After device U2-3 output low level blocks, fed back by the positive feedback branch so that the in-phase input end of third comparator U2-3
Level is always maintained at less than third comparator U2-3 inverting input level, and third comparator U2-3 output terminals keep low level,
Power supply delayed start-up circuit can not start, and the unlatching relay KA coil losing electricities, normally opened contact KA1 is disconnected, socket non-transformer
Output.
After operating overload and short-circuit protection circuit action, because with self-locking, it is necessary to which lifting a blockade can be again normal
Work, it is a kind of mode for resetting to cut off power supply by air switch, but will appear momentary power failure and troublesome in poeration
It is insufficient.It is preferably also provided with resetting reset circuit in this specific embodiment, the circuit is simple and practical, and easy to operate.As shown in fig. 6,
The clearing reset circuit is made of monostable human body touch circuit, and under normality, the monostable human body touch circuit output is low
Level, during human body touch, the monostable human body touch circuit output high level, the output of the monostable human body touch circuit
End is connect with the 4th isolating diode VD4 anodes, and the cathode of the 4th isolating diode VD4 is as the clearing reset circuit
Output terminal connect with the in-phase input end of third comparator U2-3 in the operating overload and short-circuit protection circuit.
The monostable human body touch circuit includes the 4th phase inverter U1-4 and touch sheet M, the 4th phase inverter U1-4
Input terminal and positive pole VCC1 between be equipped with the load impedance branch that is formed in parallel of capacitance C7, resistance R27, the touch sheet
M passes through panel capacitance（Such as glass panel capacitance C8 or perspex panels capacitance）With the input terminal of the 4th phase inverter U1-4
Connection, the output terminal of the 4th phase inverter U1-4 are connect with the 4th isolating diode VD4 anodes, the 4th isolating diode
The cathode of VD4 is as the output terminal for resetting reset circuit and third comparator in the operating overload and short-circuit protection circuit
The in-phase input end connection of U2-3.
This clearing reset circuit principle is simple：Before human body touch, the input terminal of the 4th phase inverter U1-4 is height
Level exports as low level, does not play clearing reset response；After human body touch, by glass panel capacitance C8, the electricity of human body
Hold and low level occur with the connection of the earth, the input terminal of the 4th phase inverter U1-4, high level occurs in output terminal, through described the
It is high that the in-phase input end of third comparator U2-3 in the operating overload and short-circuit protection circuit occur in four isolating diode VD4
Level, rises and resets reset response, and block releases.
Particular/special requirement is had no to D.C. regulated power supply in the safety electric outlet circuit of this low pressure detection control, still, is
The power consumption of D.C. regulated power supply when reducing unloaded, as shown in fig. 7, in this specific embodiment, the D.C. regulated power supply includes
Halfwave rectifier unit, primary voltage regulation unit and accurate voltage regulation unit；The halfwave rectifier unit includes the first rectifier diode
VD12, second rectifier diode VD13, RC are depressured branch, described RC decompression branch one end and the first rectifier diode VD12 anodes
The power firestreak L input terminals of connection, the RC decompression other ends and socket connect, the cathode of the second rectifier diode VD13 and the
One rectifier diode VD12 anodes connect, the anode of the second rectifier diode VD13 and the zero-power line N input terminals of socket
Connection；The primary voltage regulation unit includes the first unidirectional thyristor VT1, the first zener diode VD14, the 4th current-limiting resistance
Two pole of anode and the first rectification of R30, anti-interference capacitor C10 and the first filter capacitor C11, the first unidirectional thyristor VT1
Pipe VD12 anodes connect, and the zero-power line N input terminals of the cathode of the first unidirectional thyristor VT1 and socket connect, and described the
After one zener diode VD14 and the 4th current-limiting resistance R30 series connection, the cathode of the first zener diode VD14 and first whole
The connection of diode VD12 cathodes is flowed, the anode of the first zener diode VD14 is connected to the first unidirectional thyristor VT1
Gate pole on, be connected to the first unidirectional thyristor VT1 after the anti-interference capacitor C10 and the 4th current-limiting resistance R30 parallel connections
Cathode and gate pole on, the first filter capacitor C11 is connected to the electricity of the first rectifier diode VD12 cathodes and socket
Between the zero curve N input terminals of source, the first rectifier diode VD12 cathode terminals are that the positive pole VCC1 of primary voltage regulation unit is defeated
Outlet；The precision voltage regulation unit includes three terminal regulator U3, input filter capacitor V12 and the second filter capacitor C13, and described three
End voltage-stablizer U3 input terminals are connect with the positive pole output terminal of primary voltage regulation unit, and the input filter capacitor V12 is connected to
Between the three terminal regulator U3 input terminals and the zero-power line N input terminals of socket, the second filter capacitor C13 is connected to institute
It states between three terminal regulator U3 output terminals and the zero-power line N input terminals of socket, the three terminal regulator U3 output terminals are precision
The positive pole VCC2 output terminals of voltage regulation unit, the voltage output are first comparator U2-1, the second comparator U2- in circuit
2 and the partial pressure branch of datum high precision DC power supply is provided, positive pole VCC1 provides direct current for circuit rest part
Working power.
This D.C. regulated power supply in the unloaded state, because of the first unidirectional thyristor VT1 and the second rectifier diode
The pressure drop of VD13 is very low, therefore quiescent dissipation is approximately zero.
Above-described embodiment is only used for the inventive concept for illustrating the present invention rather than the restriction to rights protection of the present invention,
All changes for carrying out unsubstantiality to the present invention using this design, should all fall into protection scope of the present invention.
Claims (9)
1. a kind of safety electric outlet circuit of low pressure detection control, it is characterised in that：Including D.C. regulated power supply, voltage detecting
Circuit and power supply delayed start-up circuit, the voltage detecting circuit include the partial pressure being connected in series by dropping resistor and divider resistance
Branch, the dropping resistor are serially connected between the power firestreak L input terminals of socket and the firewire jack L1 electrodes of socket, described point
Pressure branch both ends are connected on the firewire jack L1 electrodes and zero line jack N1 electrodes of socket, and the zero-power line N of socket is defeated
Enter and be electrically connected between end and the zero line jack N1 electrodes of socket, the sum of resistance value of the dropping resistor and divider resistance is more than 1M
Ω, the resistance value ratio between the dropping resistor and divider resistance are 10:1-15:1, the divider resistance by the first divider resistance and
Second divider resistance is connected in series, the zero-power line N of the dividing point A and socket of first divider resistance and the second divider resistance
Voltage between input terminal is the output signal of voltage detecting circuit, the detection output signal end and power supply delayed start-up circuit
Input terminal connects；The power supply delayed start-up circuit includes one and opens relay KA and its delay driving circuit, it is described open after
The normally opened contact of electric appliance KA is connected in parallel on the dropping resistor both ends, when the detection output signal is high level, delay and running electricity
Road disconnects the unlatching relay KA coil losing electricities, and when the detection output signal is low level, delay driving circuit makes institute
It states and opens relay KA coils and be delayed to obtain electric actuation；The D.C. regulated power supply provides DC operation for power supply delayed start-up circuit
Power supply.
2. the safety electric outlet circuit of low pressure detection control according to claim 1, it is characterised in that：The power supply prolongs
Shi Kaiqi circuits include incoming level and differentiate circuit and delay driving circuit；The incoming level differentiates that circuit includes time delay resistance
With NPN type first switch triode, the time delay resistance is connected between the collector and positive pole of first switch triode,
The emitter of the first switch triode is connected to power cathode, the collector and emitter of the first switch triode it
Between be parallel with delay capacitor, the time delay resistance and delay capacitor form delay charging paths, the first switch triode
Base stage is power supply delayed start-up circuit input end；The delay driving circuit includes the first phase inverter and positive-negative-positive second switch three
Pole pipe, the unlatching relay KA coils are connected between the collector and power cathode of second switch triode, and described second
The emitter of switching transistor is connected to positive pole, and the input terminal of first phase inverter passes through the first current-limiting resistance and first
The collector connection of switching transistor, the output terminal of first phase inverter is by the second current-limiting resistance and second switch triode
Base stage connection, be connected between the collector of the second switch triode and the input terminal of the first phase inverter the first feedback electricity
Resistance and the first feedback diode series arm form the delay driving circuit.
3. the safety electric outlet circuit of any one low pressure detection control according to claim 1-2, it is characterised in that：Also
Equipped with unloaded automatic shutdown circuitry, the zero load automatic shutdown circuitry includes load detecting unit and compares and be delayed to block list
Member, the load detecting unit test socket operating current, the output terminal of load detecting unit is compared with and delay block unit
Input terminal connection, the output terminal of the comparison and delay block unit by line and in a manner of in power supply delayed start-up circuit the
The input terminal connection of one phase inverter, when the socket operating current is less than preset value, the defeated of unit is blocked in the comparison and delay
Outlet exports low level.
4. the safety electric outlet circuit of low pressure detection control according to claim 3, it is characterised in that：The load inspection
It surveys unit and includes current transformer, the current transformer is connected on the zero-power line N input terminals of socket and the zero line jack of socket
On power input line between N1 electrodes, the comparison and delay block unit include first comparator, the second phase inverter and RC
Delay circuit, the in-phase input end of first comparator are equipped with bleeder circuit and provide comparison reference level, the output of current transformer
End is connect with the inverting input of first comparator, and the output terminal of first comparator is through discharge resistance and the second inverter input
Connection, the RC delay circuits are in series by time delay resistance and delay capacitor, and the midpoint of the RC delay circuits is anti-with second
Phase device input terminal connects, and the other end of delay capacitor is connect with power cathode, another termination second switch of the time delay resistance
The collector of triode, the output terminal of the second phase inverter are connect with the cathode of the first isolating diode, two poles of the first isolation
Output terminal of the anode of pipe as unloaded automatic shutdown circuitry.
5. the safety electric outlet circuit of low pressure detection control according to claim 1, it is characterised in that：It is additionally provided with startup
Overload and short-circuit protection circuit, it is described start overload and short-circuit protection circuit include the second comparator and third phase inverter, second
The in-phase input end of comparator is equipped with bleeder circuit and provides comparison reference level, the zero-power line N input terminals of socket and socket
Voltage between firewire jack L1 is inputted as the inverting input of the second comparator, and the output terminal of second comparator passes through
Third current-limiting resistance is connect with third inverter input, and the cathode of the output terminal of third phase inverter and the second isolating diode connects
Connect, the anode of second isolating diode as the output terminal for starting overload and short-circuit protection circuit by line and in a manner of
It connect with the first inverter input in delay driving circuit, is connected between the third inverter input and power cathode
Second charging capacitor is connected with the second charging resistor between the third inverter input and positive pole, described second fills
The resistance value ratio of resistance and third current-limiting resistance is 20:1.
6. the safety electric outlet circuit of low pressure detection control according to claim 1, it is characterised in that：It is additionally provided with operation
Overload and short-circuit protection circuit, the operating overload and short-circuit protection circuit include comparing unit, and comparing unit includes third ratio
Compared with device and third isolating diode, the in-phase input end of third comparator is equipped with bleeder circuit and provides comparison reference level, third
The inverting input of comparator is equipped with bleeder circuit input and the relevant voltage signal of zero line jack N1 electrodes of socket, third ratio
Output terminal compared with device is equipped with pull-up resistor, is equipped between the output terminal of third comparator and the in-phase input end of third comparator
It is connected with the second feedback resistance and the positive feedback branch of the second feedback diode series arm composition, the output terminal of third comparator
It is connect with the cathode of third isolating diode, the anode of the third isolating diode is as the operating overload and short-circuit protection
The output terminal of circuit by line and in a manner of and delay driving circuit in the first inverter input connect.
7. the safety electric outlet circuit of low pressure detection control according to claim 6, it is characterised in that：It is additionally provided with clearing
Reset circuit, the clearing reset circuit is made of monostable human body touch circuit, under normality, the monostable human body touch electricity
Road exports low level, during human body touch, the monostable human body touch circuit output high level, and the monostable human body touch electricity
The output terminal on road is connect with the 4th isolating diode anode, and the cathode of the 4th isolating diode resets electricity as described reset
The output terminal on road is connect with the in-phase input end of third comparator in the operating overload and short-circuit protection circuit.
8. the safety electric outlet circuit of low pressure detection control according to claim 7, it is characterised in that：The monostable
Human body touch circuit includes the 4th phase inverter and touch sheet, and electricity is equipped between the input terminal and positive pole of the 4th phase inverter
Hold, the load impedance branch that resistor coupled in parallel forms, the touch sheet is by panel capacitance and the input terminal of the 4th phase inverter
Connection, the output terminal of the 4th phase inverter are connect with the 4th isolating diode anode, the cathode of the 4th isolating diode
As it is described reset reset circuit output terminal in the operating overload and short-circuit protection circuit third comparator it is same mutually defeated
Enter end connection.
9. the safety electric outlet circuit of low pressure detection control according to claim 1, it is characterised in that：The direct current is steady
Voltage source includes halfwave rectifier unit, primary voltage regulation unit and accurate voltage regulation unit；It is whole that the halfwave rectifier unit includes first
Diode, the second rectifier diode, RC decompression branches are flowed, described RC decompression branch one end connects with the first rectifier diode anode
It connects, the power firestreak L input terminals of the RC decompression other ends and socket connect, the cathode of second rectifier diode and the first rectification
Diode anode connects, and the anode of second rectifier diode and the zero-power line N input terminals of socket connect；It is described primary steady
Unit is pressed to include the first unidirectional thyristor, the first zener diode, the 4th current-limiting resistance, anti-interference capacitor and the first filtered electrical
Hold, the anode of first unidirectional thyristor is connect with the first rectifier diode anode, the cathode of first unidirectional thyristor
It is connect with the zero-power line N input terminals of socket, after first zener diode and the series connection of the 4th current-limiting resistance, described first is steady
The cathode of pressure diode is connect with the first rectifier diode cathode, and the anode of first zener diode is connected to described first
On the gate pole of unidirectional thyristor, first unidirectional thyristor is connected to after the anti-interference capacitor and the 4th current-limiting resistance parallel connection
Cathode and gate pole on, first filter capacitor is connected to the zero-power line N of the first rectifier diode cathode and socket
Between input terminal, the first rectifier diode cathode terminal is the positive pole output terminal of primary voltage regulation unit；It is described accurate steady
Unit is pressed to include three terminal regulator, input filter capacitor and the second filter capacitor, the three terminal regulator input terminal and primary are steady
The positive pole output terminal connection of unit is pressed, the input filter capacitor is connected to the three terminal regulator input terminal and socket
Between zero-power line N input terminals, second filter capacitor is connected to the power supply zero of the three terminal regulator output terminal and socket
Between line N input terminals, the three terminal regulator output terminal is the positive pole output terminal of accurate voltage regulation unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711297161.1A CN108134273B (en) | 2017-12-08 | 2017-12-08 | Power safety socket circuit controlled by low-voltage detection |
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| CN201711297161.1A CN108134273B (en) | 2017-12-08 | 2017-12-08 | Power safety socket circuit controlled by low-voltage detection |
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| CN108134273B CN108134273B (en) | 2023-12-12 |
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| CN110389552A (en) * | 2019-07-25 | 2019-10-29 | 中国科学院西安光学精密机械研究所 | A kind of calibration that can eliminate risk and power control circuit |
| CN110753421A (en) * | 2018-07-04 | 2020-02-04 | 晨辉光宝科技有限公司 | LED drive circuit and lamp tube |
| CN111799608A (en) * | 2020-07-09 | 2020-10-20 | 东莞市贝恩电子科技有限公司 | Socket circuit and socket with same |
| CN111949107A (en) * | 2019-05-15 | 2020-11-17 | 北京小米移动软件有限公司 | Method and device for controlling electronic equipment comprising USB Type-C interface and electronic equipment |
| US11231151B1 (en) * | 2021-04-16 | 2022-01-25 | Shenzhen Ekola Lighiing Technology Co., Ltd. | Smart net light strings |
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| US11231151B1 (en) * | 2021-04-16 | 2022-01-25 | Shenzhen Ekola Lighiing Technology Co., Ltd. | Smart net light strings |
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