CN114374187B - Automatic on-off circuit - Google Patents
Automatic on-off circuit Download PDFInfo
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- CN114374187B CN114374187B CN202111659788.3A CN202111659788A CN114374187B CN 114374187 B CN114374187 B CN 114374187B CN 202111659788 A CN202111659788 A CN 202111659788A CN 114374187 B CN114374187 B CN 114374187B
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- 239000003990 capacitor Substances 0.000 claims description 84
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention provides an automatic power on-off circuit; the circuit comprises a timing circuit and a power supply circuit, wherein the power supply circuit supplies power for the timing circuit, the timing circuit comprises a timer U3, a 3 pin of the timer U3 is connected with a base electrode of a triode T1, a collector electrode of the triode T1 is connected with a coil of a relay RL1, a 4 pin of the timer U3 is connected with a resistor R6, an emitter electrode of the triode T1 is grounded, a 7 pin of the resistor R6 and a 7 pin of the timer U3 are connected with a movable contact of a relay RL2, a second contact of the relay RL2 is connected with a resistor R7, and a first contact of the relay RL2 is connected with a time adjusting circuit.
Description
Technical Field
The invention relates to an automatic power on-off circuit.
Background
The power on-off test is needed to be carried out on the instrument after the instrument is produced, the instrument is powered off at regular time in the test process, and the power on-off in the test process is controlled manually in the existing test process.
Disclosure of Invention
In order to solve the technical problems, the invention provides an automatic power-on/off circuit.
The invention is realized by the following technical scheme.
The invention provides an automatic power on-off circuit; the power supply circuit supplies power to the timing circuit, the timing circuit comprises a timer U3, a 3 pin of the timer U3 is connected with a base electrode of a triode T1, a collector electrode of the triode T1 is connected with a coil of a relay RL1, a 4 pin of the timer U3 is connected with a resistor R6, an emitter electrode of the triode T1 is grounded, a 7 pin of the resistor R6 and the timer U3 is connected with a movable contact of a relay RL2, a second contact of the relay RL2 is connected with a resistor R7, a first contact of the relay RL2 is connected with a time adjusting circuit, the resistor R7 is connected with a capacitor C16, the capacitor C16 is connected with a 1 pin of the timer U3, a 5 pin of the timer U3 is connected with a capacitor C15, the capacitor C15 is connected with a coil of the relay RL2, the coil of the relay RL2 is connected with a movable contact of the relay RL1, the first contact of the relay RL1 and the coil of the relay RL2 are connected with a working power supply U3+5V.
The electric power supply circuit comprises a chip U1 and a chip U2, wherein a pin 2 of the chip U1 is connected with a working power supply, a pin 1 of the chip U1 is connected with a capacitor C10, the other end of the capacitor C10 is connected with a pin 8 of the chip and the negative electrode of a diode D1, the negative electrode of the diode D1 is also connected with an inductor L1, the other end of the inductor L1 outputs +5V LED power supply and is connected with a pin 3 of the chip U2, the inductor L1 is also connected with a capacitor C1, a capacitor C4, a capacitor C7 and one end of a resistor R1 in sequence, the other end of the capacitor C1, the capacitor C4 and the other end of the capacitor C7 are connected with the positive electrode of the diode D1, the other end of the resistor R2 is connected with a pin 5 of the chip U1 and a resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor U1 is connected with a resistor R3 and a capacitor C14, the other end of the resistor R3 is connected with a capacitor C13, the other end of the capacitor C13 and the other end of the capacitor C14 is grounded, the pin 3 of the chip U2 is connected with a +5V power supply output end of the capacitor C1, the capacitor C2, the capacitor C5, the capacitor C8, the capacitor C2 and the capacitor C3 and the capacitor C2 are connected with the other end of the capacitor C2 and the capacitor C3 and the capacitor C2 are connected in parallel.
The time adjusting circuit comprises a chip U4, wherein pins 5, 4, 3, 2, 23, 22, 9, 8, 7 and 6 of the chip U4 are respectively connected with a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R11, a resistor R12, a resistor R13 and a resistor R14 in parallel, and the other ends of the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, the resistor R20, the resistor R11, the resistor R12, the resistor R13 and the resistor R14 are connected with a first contact of a relay RL 2; the 24 feet of the chip U4 are connected with a +3V3 power supply and are grounded through a capacitor C17, the 1 feet are connected with a resistor R7, the 10 feet, the 11 feet, the 14 feet and the 13 feet are respectively connected with the 2 feet of the interface J1, the interface J2, the interface J3 and the interface J4, the 3 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all connected with a +3V3 power supply, and the 1 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all grounded.
The resistances of the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, and the resistor R20 are sequentially increased.
A light emitting diode LD1 is also connected between the emitter of the triode T1 and the movable contact of the relay RL 1.
The timer U3 is a NE555 timer.
The chip U4 is a CD4067BM analog multiplexer.
The chip U2 is a TPS54630DDA power chip, and the chip U1 is an SPX1117M-3.3V voltage stabilizing chip.
The invention has the beneficial effects that: the timer generates pulses through circuits such as a multi-harmonic oscillator, a monostable trigger, a Schmitt trigger and the like through an external resistor and a capacitor, and square wave signals with a certain duty ratio are generated by the timer to an NPN triode, so that the triode can be turned on or off, and meanwhile, the state of the triode can control the relay to be turned on or off, so that the power on or off in a certain time is realized.
Drawings
FIG. 1 is a schematic diagram of the circuit principle of the present invention;
fig. 2 is a schematic diagram of the power supply circuit of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
An automatic power on/off circuit; the power supply circuit supplies power to the timing circuit, the timing circuit comprises a timer U3, a 3 pin of the timer U3 is connected with a base electrode of a triode T1, a collector electrode of the triode T1 is connected with a coil of a relay RL1, a 4 pin of the timer U3 is connected with a resistor R6, an emitter electrode of the triode T1 is grounded, a 7 pin of the resistor R6 and the timer U3 is connected with a movable contact of a relay RL2, a second contact of the relay RL2 is connected with a resistor R7, a first contact of the relay RL2 is connected with a time adjusting circuit, the resistor R7 is connected with a capacitor C16, the capacitor C16 is connected with a 1 pin of the timer U3, a 5 pin of the timer U3 is connected with a capacitor C15, the capacitor C15 is connected with a coil of the relay RL2, the coil of the relay RL2 is connected with a movable contact of the relay RL1, the first contact of the relay RL1 and the coil of the relay RL2 are connected with a working power supply U3+5V.
The electric power supply circuit comprises a chip U1 and a chip U2, wherein a pin 2 of the chip U1 is connected with a working power supply, a pin 1 of the chip U1 is connected with a capacitor C10, the other end of the capacitor C10 is connected with a pin 8 of the chip and the negative electrode of a diode D1, the negative electrode of the diode D1 is also connected with an inductor L1, the other end of the inductor L1 outputs +5V LED power supply and is connected with a pin 3 of the chip U2, the inductor L1 is also connected with a capacitor C1, a capacitor C4, a capacitor C7 and one end of a resistor R1 in sequence, the other end of the capacitor C1, the capacitor C4 and the other end of the capacitor C7 are connected with the positive electrode of the diode D1, the other end of the resistor R2 is connected with a pin 5 of the chip U1 and a resistor R4, the other end of the resistor R4 is grounded, the other end of the resistor U1 is connected with a resistor R3 and a capacitor C14, the other end of the resistor R3 is connected with a capacitor C13, the other end of the capacitor C13 and the other end of the capacitor C14 is grounded, the pin 3 of the chip U2 is connected with a +5V power supply output end of the capacitor C1, the capacitor C2, the capacitor C5, the capacitor C8, the capacitor C2 and the capacitor C3 and the capacitor C2 are connected with the other end of the capacitor C2 and the capacitor C3 and the capacitor C2 are connected in parallel.
The time adjusting circuit comprises a chip U4, wherein pins 5, 4, 3, 2, 23, 22, 9, 8, 7 and 6 of the chip U4 are respectively connected with a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R11, a resistor R12, a resistor R13 and a resistor R14 in parallel, and the other ends of the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, the resistor R20, the resistor R11, the resistor R12, the resistor R13 and the resistor R14 are connected with a first contact of a relay RL 2; the 24 feet of the chip U4 are connected with a +3V3 power supply and are grounded through a capacitor C17, the 1 feet are connected with a resistor R7, the 10 feet, the 11 feet, the 14 feet and the 13 feet are respectively connected with the 2 feet of the interface J1, the interface J2, the interface J3 and the interface J4, the 3 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all connected with a +3V3 power supply, and the 1 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all grounded.
The resistances of the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, and the resistor R20 are sequentially increased.
A light emitting diode LD1 is also connected between the emitter of the triode T1 and the movable contact of the relay RL 1.
The timer U3 is a NE555 timer.
The chip U4 is a CD4067BM analog multiplexer.
The chip U2 is a TPS54630DDA power chip, and the chip U1 is an SPX1117M-3.3V voltage stabilizing chip.
As shown in fig. 1, under the condition of no power on, relays RL1 and RL2 are in an off state, at this time, NE555 (4 pin) -R6-RL2-R7-C16-NE555 (1 pin) forms a loop, at the moment of power on, since a loop is formed between (NE 555) 4 pin and 1 pin through R6-RL2-R7-C16, when capacitor C16 is charged, 555 timer 3 pin outputs a high level, at this time, the T1 triode is turned on, relay RL1 is turned on, RL1 relay is turned on, RL2 relay is turned on, at this time, the loop is formed as NE555 (4 pin) -R6-RL 2-time adjustment circuit-C16-NE 555 (1 pin).
From the C16 that powers on charges to relay actuation through the R7 return circuit, C16 charges through time adjustment circuit, and the switching is accomplished in the twinkling of an eye, and the time of charging through the R7 return circuit is negligible, and C16 charges time at this moment is:
t1= (resistance value of r6+ time adjustment circuit) c4ln2≡0.7 (resistance of r6+ time adjustment circuit) c16
When C16 discharges, 555 timer 3 pin output low level, and T1 triode disconnection this moment, RL1 relay disconnection leads to RL2 disconnection, and C16 discharges through R7 return circuit, and discharge time is:
T2＝R7C16ln2≈0.7R7C16
as can be seen from the formulas of the charging time and the discharging time, the T1 time can be adjusted by changing the resistance value of the time adjusting circuit, and the T2 time can be changed by changing the resistance value of R7.
The design adopts CD4067BM to select resistance, the design principle is as follows (figure 1), the CD4067BM is equivalent to a single-pole 16-throw switch, one of Q1 to Q15 is selected to be conducted with an output I/O pin by selecting A, B, C, D four input pin states, and therefore the time of adjusting the resistance to T1 is changed, and the CD4067BM increment table is as shown in figure 1.
As shown in FIG. 1, when J1, J2, J3, J4 all switch on low level, the I/O port is turned on with Q0; when J1 is accessed to high level, the other J2, J3 and J4 are accessed to low level, and the I/O port is communicated with Q1 by consulting a CD4067BM increment table; similarly, when J1, J2, J3 and J4 select different states, corresponding channels can be selected, so that the resistance is changed, the time of the NE555 output pin 3 outputting high level is adjusted, and the on-off time of the instrument is controlled.
Claims (6)
1. An automatic power on/off circuit is characterized in that: the power supply circuit supplies power to the timing circuit, the timing circuit comprises a timer U3, a 3 pin of the timer U3 is connected with a base electrode of a triode T1, a collector electrode of the triode T1 is connected with a coil of a relay RL1, a 4 pin of the timer U3 is connected with a resistor R6, an emitter electrode of the triode T1 is grounded, a 7 pin of the resistor R6 and the timer U3 is connected with a movable contact of a relay RL2, a second contact of the relay RL2 is connected with a resistor R7, a first contact of the relay RL2 is connected with a time adjusting circuit, the resistor R7 is connected with a capacitor C16, the capacitor C16 is connected with a 1 pin of the timer U3, a 5 pin of the timer U3 is connected with a capacitor C15, the coil of the relay RL2 is connected with a movable contact of the relay RL1, the first contact of the relay RL1 and the coil of the relay RL1 are connected with a working power supply U3+5;
the power supply circuit comprises a chip U1 and a chip U2, wherein a pin 2 of the chip U1 is connected with a working power supply, a pin 1 of the chip U1 is connected with a capacitor C10, the other end of the capacitor C10 is connected with a pin 8 and the negative electrode of a diode D1, the negative electrode of the diode D1 is also connected with an inductor L1, the other end of the inductor L1 outputs a +5V LED power supply and is connected with a pin 3 of the chip U2, the inductor L1 is also connected with a capacitor C1, a capacitor C4, a capacitor C7 and one end of a resistor R1 in sequence, the other ends of the capacitor C1, the capacitor C4 and the capacitor C7 are connected with the positive electrode of the diode D1, the other end of the resistor R1 is connected with a resistor R2, the resistor R2 is connected with a pin 5 of the chip U1 and the resistor R4, the other end of the resistor R4 is grounded, the pin 6 of the chip U1 is connected with the resistor R3 and the capacitor C14, the other end of the resistor R3 is connected with the capacitor C13, the other ends of the capacitor C13 and the capacitor C14 are grounded, the pin 3 of the chip U2 is connected with the output end of a +5V power supply and is respectively connected with the capacitor C2, the capacitor C5 and the capacitor C8, the capacitor C2, the capacitor C5 and the capacitor C8 are connected in parallel and then are connected with the pin 1 of the chip U2 and are grounded, the pin 2 of the chip U2 is connected with the output end of a +3V3 power supply and is respectively connected with one end of the capacitor C3, the capacitor C6 and one end of the capacitor C9 after being connected in parallel, and the other ends of the capacitor C3, the capacitor C6 and the capacitor C9 are grounded after being connected in parallel;
the time adjusting circuit comprises a chip U4, wherein pins 5, 4, 3, 2, 23, 22, 9, 8, 7 and 6 of the chip U4 are respectively connected with one end of a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R11, a resistor R12, a resistor R13 and a resistor R14, and the other ends of the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, the resistor R20, the resistor R11, the resistor R12, the resistor R13 and the resistor R14 are connected in parallel and then connected with a first contact of a relay RL 2; the 24 feet of the chip U4 are connected with a +3V3 power supply and are grounded through a capacitor C17, the 1 feet are connected with a resistor R7, the 10 feet, the 11 feet, the 14 feet and the 13 feet are respectively connected with the 2 feet of the interface J1, the interface J2, the interface J3 and the interface J4, the 3 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all connected with a +3V3 power supply, and the 1 feet of the interface J1, the interface J2, the interface J3 and the interface J4 are all grounded.
2. The automatic power on-off circuit of claim 1, wherein: the resistances of the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, the resistor R19, and the resistor R20 are sequentially increased.
3. The automatic power on-off circuit of claim 1, wherein: a light emitting diode LD1 is also connected between the emitter of the triode T1 and the movable contact of the relay RL 1.
4. The automatic power on-off circuit of claim 1, wherein: the timer U3 is a NE555 timer.
5. The automatic power on-off circuit of claim 1, wherein: the chip U4 is a CD4067BM analog multiplexer.
6. The automatic power on-off circuit of claim 1, wherein: the chip U2 is a TPS54630DDA power chip, and the chip U1 is an SPX1117M-3.3V voltage stabilizing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111659788.3A CN114374187B (en) | 2021-12-30 | 2021-12-30 | Automatic on-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111659788.3A CN114374187B (en) | 2021-12-30 | 2021-12-30 | Automatic on-off circuit |
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| Publication Number | Publication Date |
|---|---|
| CN114374187A CN114374187A (en) | 2022-04-19 |
| CN114374187B true CN114374187B (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111659788.3A Active CN114374187B (en) | 2021-12-30 | 2021-12-30 | Automatic on-off circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131981A (en) * | 1982-12-03 | 1984-06-27 | Macharg J A | An electronic control system for heating systems |
| CN202363918U (en) * | 2011-10-27 | 2012-08-01 | 中国兵器工业集团第二一四研究所苏州研发中心 | Automatic power-off control module for charger |
| CN204361009U (en) * | 2014-12-09 | 2015-05-27 | 重庆西胜电子科技有限公司 | Time delay cuts off contact witch automatically |
| CN209231917U (en) * | 2018-12-29 | 2019-08-09 | 重庆芯讯通无线科技有限公司 | The test device that switching on and shutting down for wireless communication module are tested |
| CN210624819U (en) * | 2019-06-28 | 2020-05-26 | 南宁学院 | Kitchen exhaust fan timing circuit based on 555 time base chip |
-
2021
- 2021-12-30 CN CN202111659788.3A patent/CN114374187B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131981A (en) * | 1982-12-03 | 1984-06-27 | Macharg J A | An electronic control system for heating systems |
| CN202363918U (en) * | 2011-10-27 | 2012-08-01 | 中国兵器工业集团第二一四研究所苏州研发中心 | Automatic power-off control module for charger |
| CN204361009U (en) * | 2014-12-09 | 2015-05-27 | 重庆西胜电子科技有限公司 | Time delay cuts off contact witch automatically |
| CN209231917U (en) * | 2018-12-29 | 2019-08-09 | 重庆芯讯通无线科技有限公司 | The test device that switching on and shutting down for wireless communication module are tested |
| CN210624819U (en) * | 2019-06-28 | 2020-05-26 | 南宁学院 | Kitchen exhaust fan timing circuit based on 555 time base chip |
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| Publication number | Publication date |
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| CN114374187A (en) | 2022-04-19 |
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Country or region after: China Address after: No. 249, Baiyun North Road, Baiyun District, Guiyang City, Guizhou Province Applicant after: Guiyang Yongqing Intelligent Control Technology Co.,Ltd. Address before: No. 249, Baiyun North Road, Baiyun District, Guiyang City, Guizhou Province Applicant before: GUIYANG YONGQING INSTRUMENTS & ELECTRONIC SCIENCEAND TECHNOLOGY Co.,Ltd. Country or region before: China |
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