CN202886881U - Full-hardware startup and shutdown circuit - Google Patents
Full-hardware startup and shutdown circuit Download PDFInfo
- Publication number
- CN202886881U CN202886881U CN 201220533317 CN201220533317U CN202886881U CN 202886881 U CN202886881 U CN 202886881U CN 201220533317 CN201220533317 CN 201220533317 CN 201220533317 U CN201220533317 U CN 201220533317U CN 202886881 U CN202886881 U CN 202886881U
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- triode
- pin
- resistance
- capacitor
- trigger
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Abstract
The utility model discloses a full-hardware startup and shutdown circuit. The circuit is provided with a trigger and two triodes, and the two triodes are controlled through a trigger signal of the trigger to be in an on or off state, thereby controlling on and off states of the startup and shutdown circuit. A port of a single-chip microcomputer needs not to be occupied by the startup and shutdown circuit, and a post-stage circuit is not liable to be affected due to contact failure of a switch. The startup and shutdown circuit is simple, enables startup and shutdown functions to be realized only through a few electronic components, and exhibits excellent stability.
Description
Technical field
The utility model relates to a kind of devices at full hardware on/off circuit.
Background technology
In the prior art, on/off circuit on the electronic products such as instrument, table scale all needs to debug by software, take single-chip microcomputer IO serial ports, and can there be considerable influence in it to late-class circuit under switch loose contact and shake, affects normally using and working of product.
Summary of the invention
The purpose of this utility model provides a kind of devices at full hardware on/off circuit, so that it is more stable to use the switching on and shutting down work of the electronic product that this on/off circuit is arranged.
For achieving the above object, the technical solution adopted in the utility model is: a kind of devices at full hardware on/off circuit, described on/off circuit comprises power supply, trigger U1, keyswitch SW1, positive-negative-positive triode Q1, NPN type triode Q2, described power output end is connected with diode D1, the negative pole of described diode D1 links to each other with the emitter of described triode Q1, the current collection of described triode Q1 is output terminal very, the base stage of described triode Q1 links to each other with the collector of described triode Q2 by resistance R 2, go back and be connected to resistance R 1 between the emitter of described triode Q1 and the base stage, the 1st pin of described trigger U1 is by the base stage of resistance R 6 with triode Q2, the grounded emitter setting of described triode Q2, the 2nd pin of described trigger U1 links to each other with the 5th pin, the 4th pin of described trigger U1, the 6th pin, the 7th pin respectively ground connection arranges, the 3rd pin of described trigger U1 is connected with the end of described keyswitch SW1 by resistance R 4, the other end of described keyswitch SW1 is connected between the emitter of the negative pole of diode D1 and triode Q1 by resistance R 3, and the 14th pin of described trigger U1 is connected between described resistance R 3 and the keyswitch SW1.
Preferably, described trigger U1 is toggle flip-flop.
Preferably, go back and be connected to capacitor C 1, capacitor C 2 between the 14th pin of described trigger U1 and the resistance R 3, the other end of described capacitor C 1, capacitor C 2 respectively ground connection arranges.
Preferably, go back and be connected to capacitor C 3, resistance R 5 between the 3rd pin of described trigger U1 and the described resistance R 4, the other end of described capacitor C 3, resistance R 5 respectively ground connection arranges.
Preferably, go back and be connected to capacitor C 4 between described power output end and the described diode D1 positive pole, the other end ground connection of described capacitor C 4 arranges.
Preferably, also be connected with capacitor C 5 on the collector of described triode Q1, the other end ground connection of described capacitor C 5 arranges.
Because the utilization of technique scheme, the utility model compared with prior art has following advantages: a kind of devices at full hardware on/off circuit of the present utility model, one trigger and two triodes wherein are set, control conducting and the cut-off state of two triodes by the trigger pip of trigger, thereby control the on off operating mode of this on/off circuit.This on/off circuit need not to take the port of single-chip microcomputer, does not have the impact on late-class circuit that causes because of the switch loose contact, and this on/off circuit is simple, only namely can realize power on/off function by less electronic devices and components, has good stability.
Description of drawings
Accompanying drawing 1 is the synoptic diagram of devices at full hardware on/off circuit of the present utility model.
Embodiment
Come the technical solution of the utility model is further elaborated below in conjunction with accompanying drawing.
Referring to devices at full hardware on/off circuit shown in Figure 1, this on/off circuit comprises power supply, trigger U1, keyswitch SW1, positive-negative-positive triode Q1, NPN type triode Q2, the output terminal of power supply is connected with diode D1, the positive pole of diode D1 links to each other with the output terminal of power supply, its negative pole links to each other with the emitter of triode Q1, the current collection of triode Q1 is output terminal very, this output terminal is used for being connected with subsequent conditioning circuit, the base stage of triode Q1 links to each other with the collector of triode Q2 by resistance R 2, between the base stage of triode Q1 and the emitter and be connected to resistance R 1.Trigger U1 has a plurality of pins, its the 1st pin links to each other with the base stage of triode Q2 by resistance R 6, the grounded emitter setting of triode Q2, the 2nd pin links to each other with the 5th pin, the 4th pin, the 6th pin, the 7th pin respectively ground connection arrange, the 3rd pin of trigger U1 links to each other with the end of keyswitch SW1 by resistance R 4, the other end of keyswitch SW1 is connected between the emitter of the negative pole of diode D1 and triode Q1 by resistance R 3, and the 14th pin of trigger U1 then is connected between resistance R 3 and the keyswitch SW1.Like this, during start, keyswitch SW1 is pressed, trigger U1 connects and so that the 1st pin level sets high, like this, the base voltage of triode Q2 raises, triode Q2 conducting ground connection, the base earth of triode Q1, this is so that also conducting of triode Q1, and the voltage of power supply just has been sent to late-class circuit through the collector of triode Q1.During shutdown, keyswitch SW1 is pressed, trigger U1 so that the level of the 1st pin set low, the base voltage of triode Q2 reduces like this, triode Q2 cut-off, resistance R 1 so that the base voltage of triode Q1 draw high, triode Q1 cut-off, this not conducting of on/off circuit.
In the present embodiment, trigger U1 adopts toggle flip-flop, and the trigger of the type has good negate, can at user's press of key switch SW1 to the quick negate of the level of the 1st pin, have good stability.Referring to shown in Figure 1, in the present embodiment, for the voltage to the each several part in this on/off circuit carries out filtering and voltage stabilizing, go back and be connected to capacitor C 1, capacitor C 2 between the 14th pin of trigger U1 and the resistance R 3, the other end of capacitor C 1, capacitor C 2 respectively ground connection arranges; Between the 3rd pin of trigger U1 and the resistance R 4 and be connected to capacitor C 3, resistance R 5, the other end of capacitor C 3, resistance R 5 respectively ground connection arranges; Go back and be connected to capacitor C 4 between the positive pole of power output end and diode D1, the other end ground connection of capacitor C 4 arranges; Also be connected with capacitor C 5 on the collector of triode Q1, the other end ground connection of capacitor C 5 arranges.Be arranged so that more than each local voltage has been carried out voltage stabilizing and filtering in this on/off circuit, so that this on/off circuit has better stability.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed within the protection domain of the present utility model.
Claims (6)
1. devices at full hardware on/off circuit, it is characterized in that: described on/off circuit comprises power supply, trigger U1, keyswitch SW1, positive-negative-positive triode Q1, NPN type triode Q2, described power output end is connected with diode D1, the negative pole of described diode D1 links to each other with the emitter of described triode Q1, the current collection of described triode Q1 is output terminal very, the base stage of described triode Q1 links to each other with the collector of described triode Q2 by resistance R 2, go back and be connected to resistance R 1 between the emitter of described triode Q1 and the base stage, the 1st pin of described trigger U1 is by the base stage of resistance R 6 with triode Q2, the grounded emitter setting of described triode Q2, the 2nd pin of described trigger U1 links to each other with the 5th pin, the 4th pin of described trigger U1, the 6th pin, the 7th pin respectively ground connection arranges, the 3rd pin of described trigger U1 is connected with the end of described keyswitch SW1 by resistance R 4, the other end of described keyswitch SW1 is connected between the emitter of the negative pole of diode D1 and triode Q1 by resistance R 3, and the 14th pin of described trigger U1 is connected between described resistance R 3 and the keyswitch SW1.
2. a kind of devices at full hardware on/off circuit according to claim 1, it is characterized in that: described trigger U1 is toggle flip-flop.
3. a kind of devices at full hardware on/off circuit according to claim 1 is characterized in that: go back and be connected to capacitor C 1, capacitor C 2 between the 14th pin of described trigger U1 and the resistance R 3, the respectively ground connection setting of the other end of described capacitor C 1, capacitor C 2.
4. a kind of devices at full hardware on/off circuit according to claim 1 is characterized in that: go back and be connected to capacitor C 3, resistance R 5 between the 3rd pin of described trigger U1 and the described resistance R 4, the respectively ground connection setting of the other end of described capacitor C 3, resistance R 5.
5. a kind of devices at full hardware on/off circuit according to claim 1 is characterized in that: go back and be connected to capacitor C 4 between described power output end and the described diode D1 positive pole, the other end ground connection setting of described capacitor C 4.
6. a kind of devices at full hardware on/off circuit according to claim 1 is characterized in that: also be connected with capacitor C 5 on the collector of described triode Q1, the other end ground connection setting of described capacitor C 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220533317 CN202886881U (en) | 2012-10-18 | 2012-10-18 | Full-hardware startup and shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220533317 CN202886881U (en) | 2012-10-18 | 2012-10-18 | Full-hardware startup and shutdown circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202886881U true CN202886881U (en) | 2013-04-17 |
Family
ID=48078288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220533317 Expired - Lifetime CN202886881U (en) | 2012-10-18 | 2012-10-18 | Full-hardware startup and shutdown circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202886881U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226337A (en) * | 2013-05-03 | 2013-07-31 | 深圳市科曼医疗设备有限公司 | Startup and shutdown circuit |
| CN104426368A (en) * | 2013-08-22 | 2015-03-18 | 中国长城计算机深圳股份有限公司 | Switching circuit and power supply |
-
2012
- 2012-10-18 CN CN 201220533317 patent/CN202886881U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226337A (en) * | 2013-05-03 | 2013-07-31 | 深圳市科曼医疗设备有限公司 | Startup and shutdown circuit |
| CN103226337B (en) * | 2013-05-03 | 2015-09-16 | 深圳市科曼医疗设备有限公司 | On/off circuit |
| CN104426368A (en) * | 2013-08-22 | 2015-03-18 | 中国长城计算机深圳股份有限公司 | Switching circuit and power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
|
| CX01 | Expiry of patent term |