CN203260994U - Protection circuit for preventing power-on restart after powering off - Google Patents
Protection circuit for preventing power-on restart after powering off Download PDFInfo
- Publication number
- CN203260994U CN203260994U CN2013202054736U CN201320205473U CN203260994U CN 203260994 U CN203260994 U CN 203260994U CN 2013202054736 U CN2013202054736 U CN 2013202054736U CN 201320205473 U CN201320205473 U CN 201320205473U CN 203260994 U CN203260994 U CN 203260994U
- Authority
- CN
- China
- Prior art keywords
- circuit
- switching device
- electronic switching
- switch
- controlled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Relay Circuits (AREA)
Abstract
The utility model relates to a protection circuit for preventing power-on restart after powering off and belongs to the technical field of electrical appliance safety. The protection circuit comprises a motor driving circuit, a start control circuit of which on/off is controlled by a first switch (K1), and a delay circuit. A motor control circuit is internally connected in series with a start control device (Q4); a control output end of the start control circuit is connected with a controlled end of the start control device; a control output end of the delay circuit is connected with a blocking controlled end of the start control circuit through a first electronic switching device (Q2); switching-on controlled ends of the first electronic switching device (Q2) and a second electronic switching device (Q1) are grounded through a third electronic switching device (Q3) controlled by the first switch; and a controlled end of the third electronic switching device is grounded through the second electronic switching device (Q1) controlled by the delay circuit. The protection circuit provided by the utility model has the advantages of being compact in structure, safe and reliable, low in cost and the like.
Description
Technical field
The utility model relates to a kind of protective circuit, and especially a kind of outage rear defence incoming call is restarted protective circuit, belongs to the security appliance technical field.
Background technology
Many consuming devices such as electric tool all start by switch control.In these electrical equipment use procedures, if on off state can not change during accident power-off thereupon, after restoring electricity suddenly, will automatically start, thus the potential safety hazard of bringing.In order to address this problem, automatic disconnection when usually adopting relay to realize the outage of switch.Its typical technology scheme can be 922063419,201220034045.7,200520049745.3 Chinese patent literature referring to application number.The shortcoming of this type of technical scheme is that the relay volume is large, and less reliable respectively.Although adopt smart circuit can avoid above-mentioned shortcoming by the software engineering scheme, cost is uneconomical, software authentication is loaded down with trivial details.
Summary of the invention
The purpose of this utility model is: for the shortcoming that above-mentioned prior art exists, proposes a kind of not only safe and reliablely, and the outage rear defence of cost economy simple in structure is sent a telegram here and is restarted protective circuit.
In order to reach above purpose; outage rear defence incoming call of the present utility model is restarted protective circuit and is comprised motor-drive circuit; the startup control circuit of the first switch (K1) control break-make; and delay circuit; be in series with in the described circuit for controlling motor and start control device (Q4); the control output end of described startup control circuit connects the controlled end that starts control device; the control output end of described delay circuit connects the blocking-up controlled end of described startup control circuit by the first electronic switching device (Q2); the conducting controlled end of described the first electronic switching device (Q2) and the second electronic switching device (Q1) is by being controlled by the 3rd electronic switching device (Q3) ground connection of the first switch, and the controlled end of described the 3rd electronic switching device is by being controlled by the second electronic switching device (Q1) ground connection of delay circuit.
After adopting protective circuit of the present utility model; under normal circumstances; under the first switch disconnection, connect electricity; after delay circuit is delayed time with scheduled duration (for example 1 second); conducting the first and second electronic switching devices; this moment the 3rd electronic switching device to be in the cut-off state conductively-closed inoperative, thereby the first electronic switching device guarantees to start the control circuit normal operation.Behind the first switch closure, motor normally starts.
And when sending a telegram here suddenly behind the accident power-off, because the first switch is in closure state, therefore at once conducting of the 3rd electronic switching device makes the first and the 3rd electronic switching device be in the cut-off state conductively-closed, start control circuit and be blocked and work, so motor can not start.Only have after disconnecting the first switch, just can enter normal operating conditions, thereby the motor accidental activation when having avoided unexpected incoming call has guaranteed handling safety conscientiously.
The utility model further improves, and described motor-drive circuit also is in series with second switch (K2), and described the first switch and second switch are linked switch.Can play the double insurance effect like this, safer.
The utility model further improves, and the startup control device in the described startup control circuit is for consisting of the soft start controller spare (for example controllable silicon) of SS (soft start) control circuit.Can make like this motor have good starting characteristic, avoid surge current.
Because the utility model both avoided the contact devices such as employing relay, saved again the trouble of software authentication, have therefore that structure is small and exquisite, safe and reliable, cost economic dispatch plurality of advantages.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model.
Embodiment
Embodiment one
The outage rear defence incoming call of present embodiment is restarted protective circuit and is applied to electric angle mill; its circuit consists of as shown in Figure 1; the electric tool safety that mainly comprises series connection second switch K2(angle mill and so on requires motor-drive circuit that this switch must be set; the motor-drive circuit of other products not necessarily needs this switch) control the motor-drive circuit of break-make, the SS (soft start) control circuit of the first K switch 1 control break-make, and the NE555 chip is the delay circuit of core.Be in series with the controllable silicon Q4 as soft start controller spare in the circuit for controlling motor, SS (soft start) control circuit is take the U2008B chip as core devices, and its control output end 8 pin connect the controlled end of soft start controller spare controllable silicon Q4.Control output end 3 pin of delay circuit NE555 chip connect blocking-up controlled end 4 pin of SS (soft start) control circuit U2008B chip by the first triode Q1 as the first electronic switching device, the first triode Q1 and as three triode (three electronic switching device) the Q3 ground connection of conducting controlled end by being controlled by the first K switch 1 of the second triode Q2 of the second electronic switching device, the controlled end of the 3rd triode Q3 is by being controlled by the second triode Q2 ground connection of delay circuit, and the first K switch 1 and second switch K2 are linked switch.Series resistance and diode R6, D2 and R7, D1 consist of respectively among Fig. 1 step-down, voltage stabilizing circuit.
Under normal circumstances, K1 and K2 disconnect simultaneously, and after plugging in, delay circuit is started working, the 0.5 second output high level of delaying time, and conducting Q1 and Q2, thus SS (soft start) control circuit can be worked, shield simultaneously Q3.After this, with the state that K1 and K2 get to out, connect circuit, motor can normally move.
Have a power failure in the use procedure as suddenly, motor stalling, K1 and K2 still keep on-state.When sending a telegram here suddenly, because K1 and K2 are always closed, Q3 must conduct first, shield at once Q1 and Q2, SS (soft start) control circuit is blocked and can not works, and soft start controller spare can't conducting, therefore motor-drive circuit still is in off-position, until the OFF of the first and second switches elder generation is once, get to again the ON state, whole circuit just recovers to run well.
The outage rear defence incoming call of present embodiment is restarted protective circuit and adopted pure electronic circuit, and time-base circuit chip NE555, soft start control chip U2008B commonly used are organically combined, and is with low cost; Non-relay thereby reliable and stable; Power can be done greatly, and PCB need not do the change in space.
Except this embodiment, the utility model can also be by many variations, and the startup control device that for example starts in the control circuit also can be the switching device of hard reboot characteristic; K1 and K2 can be linked switches, also can be two split switches; K2 must be the super-high-current switch, and K1 then can be high-current switch or signaling switch; Q1, Q2, Q3 can be transistors, also can be metal-oxide-semiconductors, or the electronic switching device of relay class; Integrated circuit (IC) chip can be selected has roughly the same other model of characteristic; These all belong to the protection range of the utility model requirement.
Claims (5)
1. an outage rear defence incoming call is restarted protective circuit; comprise motor-drive circuit; the startup control circuit of the first switch (K1) control break-make; it is characterized in that: also comprise delay circuit; be in series with in the described circuit for controlling motor and start control device (Q4); the control output end of described startup control circuit connects the controlled end that starts control device; the control output end of described delay circuit connects the blocking-up controlled end of described startup control circuit by the first electronic switching device (Q2); the conducting controlled end of described the first electronic switching device (Q2) and the second electronic switching device (Q1) is by being controlled by the 3rd electronic switching device (Q3) ground connection of the first switch, and the controlled end of described the 3rd electronic switching device is by being controlled by the second electronic switching device (Q1) ground connection of delay circuit.
2. outage rear defence incoming call according to claim 1 is restarted protective circuit, and it is characterized in that: described motor-drive circuit also is in series with second switch, and described the first switch and second switch are linked switch.
3. outage rear defence incoming call according to claim 2 is restarted protective circuit, it is characterized in that: the startup control device in the described startup control circuit is for consisting of the soft start controller spare of SS (soft start) control circuit.
4. outage rear defence incoming call according to claim 3 is restarted protective circuit, and it is characterized in that: described soft start controller spare is controllable silicon.
5. outage rear defence incoming call according to claim 4 is restarted protective circuit, and it is characterized in that: described electronic switching device is triode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202054736U CN203260994U (en) | 2013-04-23 | 2013-04-23 | Protection circuit for preventing power-on restart after powering off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202054736U CN203260994U (en) | 2013-04-23 | 2013-04-23 | Protection circuit for preventing power-on restart after powering off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203260994U true CN203260994U (en) | 2013-10-30 |
Family
ID=49473532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013202054736U Expired - Lifetime CN203260994U (en) | 2013-04-23 | 2013-04-23 | Protection circuit for preventing power-on restart after powering off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203260994U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739329A (en) * | 2014-12-09 | 2016-07-06 | 南京德朔实业有限公司 | Electric tool |
| CN106253887A (en) * | 2016-07-28 | 2016-12-21 | 苏州律力电子科技有限公司 | A kind of soft start switch Circuits System |
| CN115800235A (en) * | 2021-09-09 | 2023-03-14 | 南京泉峰科技有限公司 | Starting protection circuit applied to electric tool and electric tool |
-
2013
- 2013-04-23 CN CN2013202054736U patent/CN203260994U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105739329A (en) * | 2014-12-09 | 2016-07-06 | 南京德朔实业有限公司 | Electric tool |
| CN105739329B (en) * | 2014-12-09 | 2018-04-27 | 南京德朔实业有限公司 | Electric tool |
| CN106253887A (en) * | 2016-07-28 | 2016-12-21 | 苏州律力电子科技有限公司 | A kind of soft start switch Circuits System |
| CN115800235A (en) * | 2021-09-09 | 2023-03-14 | 南京泉峰科技有限公司 | Starting protection circuit applied to electric tool and electric tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9705303B2 (en) | High voltage direct current soft-start circuit | |
| CN102820638B (en) | Overcurrent protection device and electronic equipment | |
| CN103561167A (en) | Device, method and terminal equipment for restarting after dead halt | |
| KR102015295B1 (en) | Load switch integrated circuit and electronic device | |
| CN103779829A (en) | Load protection circuit | |
| CN105207652A (en) | Safety protection circuit of contactless electronic relay | |
| CN110581541A (en) | surge current suppression circuit with isolation control | |
| JP2003258615A (en) | Electric assembly, electric system, solid-state relay and solid-state a relay | |
| CN104078940A (en) | Secondary power system and power supply device | |
| CN203260994U (en) | Protection circuit for preventing power-on restart after powering off | |
| CN100541955C (en) | Supply unit with overload protection | |
| CN110890749A (en) | Power supply reverse connection prevention circuit and power supply circuit | |
| CN207251176U (en) | GFCI built-in timer circuits | |
| CN104182315B (en) | A kind of circuit, electronic equipment and its corresponding commissioning device of control debugging function | |
| US7800249B1 (en) | Power supply system | |
| CN205563548U (en) | Hot plug circuit | |
| CN205160489U (en) | Contactless electronic relay's safety protection circuit | |
| CN101877475B (en) | Power supply short-circuit protection circuit | |
| CN213906650U (en) | Power output switch control circuit | |
| CN205508652U (en) | Button switch of protection is restarted in area outage | |
| CN212461525U (en) | Contact protection circuit of electromagnetic relay | |
| CN201118194Y (en) | Energy supply protector | |
| CN210837547U (en) | Mechanical switch circuit structure | |
| CN204030577U (en) | A kind of surge impact protection circuit for direct current machine and air conditioner | |
| CN203445850U (en) | Solid state relay drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131030 |
|
| CX01 | Expiry of patent term |