CN104779938A - Delayed power-off circuit - Google Patents
Delayed power-off circuit Download PDFInfo
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- CN104779938A CN104779938A CN201410013336.1A CN201410013336A CN104779938A CN 104779938 A CN104779938 A CN 104779938A CN 201410013336 A CN201410013336 A CN 201410013336A CN 104779938 A CN104779938 A CN 104779938A
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- relay
- nand gate
- gate chip
- circuit
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Abstract
An embodiment of the invention discloses a delayed power-off circuit comprising a touch switch, a NAND gate chip, a storage capacitor, a step-down resistor, and a relay. One end of the touch switch is connected to the positive pole of a power supply; the other end of the touch switch is connected with a first input end of the NAND gate chip; the cathode of the storage capacitor is connected to the negative pole of the power supply; the anode of the storage capacitor is connected with a second input end of the NAND gate chip; the output end of the NAND gate chip is connected with the power end of the relay; a first common end of the relay is connected with the second input end of the NAND gate chip; a first normally closed end of the relay is connected to the negative pole of the power supply; a first normally open end of the relay is connected with the other end of the touch switch through the step-down resistor; a second common end of the relay is connected with the other end of the touch switch; and a second normally open end of the relay is connected with one end of the touch switch. By adopting the delayed power-off circuit of the invention, the power supply can be cut off in a delayed manner after the touch switch is disconnected. The delayed power-off circuit has the characteristics of being simple in circuit, reliable, and small in size.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of circuit capable of delaying disconnection.
Background technology
In daily life, user, when some electrical equipment of use, does not wish the very first time power-off immediately at cut-off switch sometimes.Such as, be placed in the street lamp in corridor, user, after closedown street lamp, extinguishes after wishing street lamp Delayed illumination a period of time again, thus can leave corridor when there being illumination.
At present, the switching circuit of most of electrical equipment is all hard shutoff, not the design of delay cut-off.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of circuit capable of delaying disconnection, can be implemented in the function disconnecting time delay deenergization after touch-switch, and has the advantages that circuit is simple, reliable and volume is little.
In order to solve the problems of the technologies described above, embodiments provide a kind of circuit capable of delaying disconnection, comprise touch-switch, NAND gate chip, storage capacitor, dropping resistor and relay, wherein:
One end access positive source of described touch-switch, the other end of described touch-switch is connected with the first input end of described NAND gate chip, the negative electrode access power cathode of described storage capacitor, the anode of described storage capacitor is connected with the second input of described NAND gate chip, the output of described NAND gate chip is connected with the power end of described relay, first common port of described relay is connected with the second input of described NAND gate chip, first normal-closed end access power cathode of described relay, first Chang Kaiduan of described relay is connected with one end of described dropping resistor, the other end of described dropping resistor is connected with the other end of described touch-switch, second common port of described relay is connected with the other end of described touch-switch, second normal-closed end of described relay is unsettled, second Chang Kaiduan of described relay is connected with one end of described touch-switch.
Implement the embodiment of the present invention, there is following beneficial effect: the embodiment of the present invention is when touch-switch disconnects, the switch of relay is utilized to continue to make circuit access power supply, power supply charges to storage capacitor, after the preset charged time, disconnected by the switch of the indirect control relay of high level produced after storage capacitor charging, realize the function of time delay deenergization after disconnecting touch-switch, and have the advantages that circuit is simple, reliable and volume is little, the switching circuit portion of all kinds of electric equipment can be widely used in.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of a kind of circuit capable of delaying disconnection that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The circuit capable of delaying disconnection that the embodiment of the present invention provides may be used for the switching circuit of the power consumption equipment such as electronic equipment, household electrical appliance, also can directly as power consumption equipment, such as lighting.
Fig. 1 is the circuit theory diagrams of a kind of circuit capable of delaying disconnection that the embodiment of the present invention provides.Circuit capable of delaying disconnection as shown in the figure in the embodiment of the present invention at least can comprise touch-switch, NAND gate chip, storage capacitor, dropping resistor and relay, wherein:
One end access positive source of touch-switch, the other end of touch-switch is connected with the first input end of NAND gate chip, the negative electrode access power cathode of storage capacitor, the anode of storage capacitor is connected with the second input of NAND gate chip, the output of NAND gate chip is connected with the power end of relay, first common port of relay is connected with the second input of NAND gate chip, first normal-closed end access power cathode of relay, first Chang Kaiduan of relay is connected with one end of dropping resistor, the other end of dropping resistor is connected with the other end of touch-switch, second common port of relay is connected with the other end of touch-switch, second normal-closed end of relay is unsettled, second Chang Kaiduan of relay is connected with one end of described touch-switch.
Optionally, dropping resistor also comprises potentiometer.
Optionally, circuit capable of delaying disconnection also comprises LED and divider resistance, and the negative electrode access power cathode of LED, the anode of LED is connected with one end of divider resistance, and the other end of divider resistance is connected with the second common port of relay.
Optionally, circuit capable of delaying disconnection also comprises triode, the output of NAND gate chip is connected with the power end of relay by triode, wherein, the base stage of triode is connected with the output of NAND gate chip, the emitter access power cathode of triode, the collector electrode of triode is connected with the power end of relay.
Optionally, circuit capable of delaying disconnection also comprises diode, and the anode of diode is connected with the collector electrode of triode, and the negative electrode of diode is connected with the second common port of relay.
Optionally, circuit capable of delaying disconnection also comprises filter capacitor, and the anode of filter capacitor is connected with the other end of touch-switch, the negative electrode access power cathode of filter capacitor.
Refer to Fig. 1, in the embodiment of the present invention, touch-switch is SB, storage capacitor is C2, dropping resistor is R3 and RP1, and potentiometer is RP1, and relay is K, first common port of relay is K-1, first normal-closed end of relay and the first Chang Kaiduan are respectively 1 end corresponding to K-1 and 2 ends, and the second common port of relay is K-2, and the second normal-closed end of relay and the second Chang Kaiduan are respectively 2 ends corresponding to K-2 and 1 end, LED is LED, divider resistance is R1, and filter capacitor is C1, and diode is D1, triode is Q1, and power supply is 12V DC power supply.
In specific implementation process, when touch-switch SB closes, LED electrified light emitting, positive source exports the first input end of high level to NAND gate chip, and power cathode output low level is to the second input of NAND gate chip.If two of NAND gate chip inputs are all high level, then the output of NAND gate chip exports high level.After NAND gate chip exports high level, the now Vb>Vc of triode Q1, triode Q1 conducting, diode D1 plays the effect of one-way conduction, and relay K works on power.After relay K powers on, the second common port K-2 and second Chang Kaiduan 1 termination of relay K are closed.Under it is pointed out that current state, even if after touch-switch SB disconnection, power supply is still by K-2 place in circuit, and LED still can be luminous.
On the other hand, while above-mentioned relay K works on power, the first common port K-1 and first Chang Kaiduan 2 termination of relay K are closed.After K-1 and 2 terminations are closed, positive source is charged to storage capacitor C2 by resistance R3 and potentiometer RP1, and after the preset charged time, the anode voltage of storage capacitor C2 becomes high level, and the second input of NAND gate chip receives high level.If two of NAND gate chip input level are one high and one low, then the output of NAND gate chip changes output low level into.After NAND gate chip output low level, the now Vb ≯ Vc of triode Q1, triode Q1 turn off, and relay K power down quits work, thus the second common port K-2 of relay K and the second normal-closed end 2 termination are closed, and power supply is place in circuit no longer, and LED is extinguished.
Further, the resistance of potentiometer RP1 is larger, and storage capacitor C2 charging current is less, thus the above-mentioned preset charged time is longer, otherwise the resistance of potentiometer RP1 is less, and storage capacitor C2 charging current is larger, thus the above-mentioned preset charged time is shorter.By changing the preset charged time, the time of power supply time delayed turn-off can be changed, i.e. the time of LED time-delay closing.
The embodiment of the present invention is when touch-switch disconnects, the switch of relay is utilized to continue to make circuit access power supply, power supply charges to storage capacitor, after the preset charged time, disconnected by the switch of the indirect control relay of high level produced after storage capacitor charging, realize the function of time delay deenergization after disconnecting touch-switch, and have the advantages that circuit is simple, reliable and volume is little, the switching circuit portion of all kinds of electric equipment can be widely used in.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (9)
1. a circuit capable of delaying disconnection, is characterized in that, described circuit comprises touch-switch, NAND gate chip, storage capacitor, dropping resistor and relay, wherein:
One end access positive source of described touch-switch, the other end of described touch-switch is connected with the first input end of described NAND gate chip, the negative electrode access power cathode of described storage capacitor, the anode of described storage capacitor is connected with the second input of described NAND gate chip, the output of described NAND gate chip is connected with the power end of described relay, first common port of described relay is connected with the second input of described NAND gate chip, first normal-closed end access power cathode of described relay, first Chang Kaiduan of described relay is connected with one end of described dropping resistor, the other end of described dropping resistor is connected with the other end of described touch-switch, second common port of described relay is connected with the other end of described touch-switch, second normal-closed end of described relay is unsettled, second Chang Kaiduan of described relay is connected with one end of described touch-switch.
2. circuit capable of delaying disconnection as claimed in claim 1, it is characterized in that, when described touch-switch closes, described positive source exports the first input end of high level to described NAND gate chip, described power cathode output low level is to the second input of described NAND gate chip, the output of described NAND gate chip exports high level, described relay works on power, thus the second common port of described relay engages with the second Chang Kaiduan, after described touch-switch disconnects, described power supply still can place in circuit.
3. circuit capable of delaying disconnection as claimed in claim 2, it is characterized in that, after described relay works on power, first common port of described relay engages with the first Chang Kaiduan, described positive source gives the charging of described storage capacitor by described dropping resistor, after the preset charged time, the anode voltage of described storage capacitor becomes high level, second input of described NAND gate chip receives high level, the output of described NAND gate chip changes output low level into, described relay power down quits work, thus the second common port of described relay engages with the second normal-closed end, described power supply no longer place in circuit.
4. circuit capable of delaying disconnection as claimed in claim 3, it is characterized in that, described dropping resistor also comprises potentiometer, and the resistance of described potentiometer is larger, and described storage capacitor charging current is less, thus the described preset charged time is longer;
The resistance of described potentiometer is less, and described storage capacitor charging current is larger, thus the described preset charged time is shorter.
5. circuit capable of delaying disconnection as claimed in claim 1, it is characterized in that, described circuit also comprises LED and divider resistance, the negative electrode of described LED accesses described power cathode, the anode of described LED is connected with one end of described divider resistance, and the other end of described divider resistance is connected with the second common port of described relay.
6. circuit capable of delaying disconnection as claimed in claim 2, it is characterized in that, described circuit also comprises triode, the output of described NAND gate chip is connected with the power end of described relay by described triode, wherein, the base stage of described triode is connected with the output of described NAND gate chip, and the emitter of described triode accesses described power cathode, and the collector electrode of described triode is connected with the power end of described relay.
7. circuit capable of delaying disconnection as claimed in claim 6, is characterized in that, when described NAND gate chip exports high level, described triode ON, described relay works on power.
8. circuit capable of delaying disconnection as claimed in claim 7, it is characterized in that, described circuit also comprises diode, and the anode of described diode is connected with the collector electrode of described triode, and the negative electrode of described diode is connected with the second common port of described relay.
9. the circuit capable of delaying disconnection as described in any one of claim 1, is characterized in that, described circuit also comprises filter capacitor, and the anode of described filter capacitor is connected with the other end of described touch-switch, and the negative electrode of described filter capacitor accesses described power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013336.1A CN104779938A (en) | 2014-01-10 | 2014-01-10 | Delayed power-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013336.1A CN104779938A (en) | 2014-01-10 | 2014-01-10 | Delayed power-off circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104779938A true CN104779938A (en) | 2015-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410013336.1A Pending CN104779938A (en) | 2014-01-10 | 2014-01-10 | Delayed power-off circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2428886Y (en) * | 2000-05-18 | 2001-05-02 | 吴德军 | High-power timed power-regulation multipurpose socket |
| CN203368847U (en) * | 2013-07-12 | 2013-12-25 | 黄月华 | Light-controlled road lamp controller |
-
2014
- 2014-01-10 CN CN201410013336.1A patent/CN104779938A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2428886Y (en) * | 2000-05-18 | 2001-05-02 | 吴德军 | High-power timed power-regulation multipurpose socket |
| CN203368847U (en) * | 2013-07-12 | 2013-12-25 | 黄月华 | Light-controlled road lamp controller |
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Application publication date: 20150715 |