CN203071556U - Inductive load turn-off protection circuit - Google Patents
Inductive load turn-off protection circuit Download PDFInfo
- Publication number
- CN203071556U CN203071556U CN 201320048767 CN201320048767U CN203071556U CN 203071556 U CN203071556 U CN 203071556U CN 201320048767 CN201320048767 CN 201320048767 CN 201320048767 U CN201320048767 U CN 201320048767U CN 203071556 U CN203071556 U CN 203071556U
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- inductive load
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Abstract
The utility model discloses an inductive load turn-off protection circuit. The inductive load turn-off protection circuit comprises a power supply circuit, a switch driving circuit, a switching triode, a bidirectional Zener diode and an inductive load, wherein three pole tips of the switching triode are respectively connected with the positive pole of the power supply circuit, the switch driving circuit and one end of the inductive load, the negative pole of the power supply circuit is connected with the other end of the inductive load, and the bidirectional Zener diode are in parallel connection with the two ends of the inductive load. The inductive load turn-off protection circuit provided by the utility model can exert a protection effect on the switching triode during loss of power and turn-off of a switch of the inductive load and overcomes the problem of delayed turn-off of the inductive load, so processing efficiency of a machine tool is improved.
Description
Technical field
The utility model relates to the industry control technical field of automation, particularly a kind of inductive load cut-off protection circuit.
Background technology
Be in the lathe of power with hydraulic pressure, gas, the control that the parts on the lathe are moved forward and backward is to realize by the switch of electromagnetically operated valve.Arrive original position more again as an operation after previous action processing puts in place, carry out next operation again after previous operation is finished, so circulation goes round and begins again.Wherein to get when electric be the course of work to electromagnetically operated valve, is reseting procedure during dead electricity, so for whole working (machining) efficiency, the shared time of reseting procedure can influence the beginning of process time next time, The faster the better so reset.But electromagnetically operated valve belongs to inductive load, can gather strength after electric, energy can discharge the minimizing that hinders electric current when its dead electricity is turn-offed, if under the situation that does not add fly-wheel diode, the inductive load two ends can produce a reverse voltage and be added on the two poles of the earth of triode with after the supply voltage stack again, thereby surpass the puncture voltage of triode and damage triode.Existing solution is to add fly-wheel diode to be connected in reverse parallel in the inductive load two ends; the reverse current that produces when turn-offing forms bleed-off circuit by the general-purpose diode conducting; as shown in Figure 1; can limit reverse voltage like this within the conduction voltage drop scope of general-purpose diode, thereby play the effect of protection switch triode.But this method can produce electromagnetically operated valve and turn-off the slow problem of reaction, and to be electric current at the energy that inductive load gathers release reason also exists before finishing, and do not turn-off so electromagnetically operated valve can be kept a period of time.The solution that the utility model provides is bi-directional zener diode in parallel at the inductive load two ends; the induced voltage that the switch dead electricity of inductive load produces when turn-offing is limited in the scope of bi-directional zener diode conduction voltage drop; do not reach the puncture voltage of switch triode behind the stack supply voltage yet; so can under the situation that protection does not damage to triode, improve the turn-off response speed of electromagnetically operated valve simultaneously, thereby improve the working (machining) efficiency of lathe.
The utility model content
The purpose of this utility model provides a kind of inductive load cut-off protection circuit, in the two ends of inductive load bi-directional zener diode in parallel, in the time of the protection switch triode, has reduced the time-delay that inductive load switch dead electricity is turn-offed.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of inductive load cut-off protection circuit; it is characterized in that; comprise power circuit, switch driving circuit, switch triode, bi-directional zener diode and inductive load; three positive pole, switch driving circuit and inductive load one ends that extremely connect power circuit respectively of described switch triode; the negative pole of described power circuit connects the other end of inductive load, and described bi-directional zener diode is connected in parallel on the two ends of inductive load.
Description of drawings
Fig. 1 is the circuit connection diagram of existing inductive load cut-off protection circuit.
The structured flowchart of a kind of inductive load cut-off protection circuit that Fig. 2 provides for the utility model.
The circuit connection diagram of a kind of inductive load cut-off protection circuit that Fig. 3 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
As Fig. 2, shown in Figure 3; a kind of inductive load cut-off protection circuit; comprise power circuit, switch driving circuit, switch triode, bi-directional zener diode and inductive load; wherein; three positive pole, switch driving circuit and inductive load one ends that extremely connect power circuit respectively of switch triode; the negative pole of power circuit is by the other end of lead connection inductive load, and described bi-directional zener diode is connected in parallel on the two ends of inductive load.Wherein bi-directional zener diode is done the afterflow protective effect; the horse-power formula of inductive load electromagnetically operated valve is w=uit; so t=w/ui; the electric energy that accumulates when w is for solenoid valve conduction in the formula; u is the voltage that electromagnetically operated valve turn-offs two ends when releasing electric energy; i keeps the electric current of adhesive when being the electromagnetically operated valve shutoff; t is also to be discharge time time of keeping adhesive; the conduction voltage drop of bi-directional zener diode can be 40V; so t=w/40i; and in the existing inductive load cut-off protection circuit; as shown in Figure 1; conduction voltage drop at the general-purpose diode of inductive load electromagnetically operated valve two ends reverse parallel connection is 0.7V; so t '=w/0.7i, so a kind of inductive load cut-off protection circuit that the utility model provides is compared with existing inductive load cut-off protection circuit, the turn-off time of electromagnetically operated valve is fast 57 times; the efficient waste is reduced more than 50 times, thus the working (machining) efficiency of raising lathe.
To sum up, a kind of inductive load cut-off protection circuit that the utility model provides shields to the switch triode when the switch dead electricity of inductive load is turn-offed, and can solve inductive load simultaneously and turn-off the slow problem of reaction, thereby improve the working (machining) efficiency of lathe.
Above-described only is execution mode of the present utility model.For the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model creation design, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (1)
1. inductive load cut-off protection circuit; it is characterized in that; comprise power circuit, switch driving circuit, switch triode, bi-directional zener diode and inductive load; three positive pole, switch driving circuit and inductive load one ends that extremely connect power circuit respectively of described switch triode; the negative pole of described power circuit connects the other end of inductive load, and described bi-directional zener diode is connected in parallel on the two ends of inductive load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320048767 CN203071556U (en) | 2013-01-30 | 2013-01-30 | Inductive load turn-off protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320048767 CN203071556U (en) | 2013-01-30 | 2013-01-30 | Inductive load turn-off protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203071556U true CN203071556U (en) | 2013-07-17 |
Family
ID=48770307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320048767 Expired - Fee Related CN203071556U (en) | 2013-01-30 | 2013-01-30 | Inductive load turn-off protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203071556U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108538536A (en) * | 2018-03-22 | 2018-09-14 | 北京航天动力研究所 | A kind of accelerated release in vitro circuit and method based on two-way TVS |
| CN112330874A (en) * | 2020-08-19 | 2021-02-05 | 北京三快在线科技有限公司 | Control method, control device, cash register system, electronic device and computer readable medium |
-
2013
- 2013-01-30 CN CN 201320048767 patent/CN203071556U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108538536A (en) * | 2018-03-22 | 2018-09-14 | 北京航天动力研究所 | A kind of accelerated release in vitro circuit and method based on two-way TVS |
| CN112330874A (en) * | 2020-08-19 | 2021-02-05 | 北京三快在线科技有限公司 | Control method, control device, cash register system, electronic device and computer readable medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20180130 |