CN109494119A - A kind of relay driving protection circuit for household electrical appliances - Google Patents
A kind of relay driving protection circuit for household electrical appliances Download PDFInfo
- Publication number
- CN109494119A CN109494119A CN201811456831.4A CN201811456831A CN109494119A CN 109494119 A CN109494119 A CN 109494119A CN 201811456831 A CN201811456831 A CN 201811456831A CN 109494119 A CN109494119 A CN 109494119A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- diode
- relay
- triode
- chip microcontroller
- 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.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
Abstract
The invention discloses a kind of relay drivings for household electrical appliances to protect circuit, it include single-chip microcontroller, first resistor R1, second resistance R2, first diode D1, second diode D2, first capacitor C1, second capacitor C2, triode Q1 and relay, wherein, the output pin of single-chip microcontroller is connected with the cathode of the anode of first diode D1 and the second diode D2 respectively by first capacitor C1, and the cathode of first diode D1 is connected with one end of one end of the second capacitor C2 and first resistor R1 respectively, the other end of first resistor R1 is connected with the base stage of second resistance R2 and triode respectively；The anode of second diode D2, the other end of the second capacitor C2, the other end of second resistance R2 and the emitter of triode are grounded；The collector of the triode is connected with the coil of relay, meanwhile, the other end of the coil of relay is connected with the power supply being preset with, wherein the coil of relay is also parallel with a freewheeling diode.
Description
Technical field
The present invention relates to small household appliances technical fields, protect circuit more particularly, to a kind of relay driving for household electrical appliances.
Background technique
The load computer heating control of some heating class small household appliances (such as rice cooker, pressure cooker, hot-water bottle etc.) is on the market now
It is dynamic that the contact that high level or low level indirectly control relay by relevant control circuit is exported by the I/O interface of single-chip microcontroller
Make to realize work of the power on/off to control related load, and when single-chip microcontroller is interfered by working environment or other electronic equipments
When causing failure non-normal working, it (may be high level, it is also possible to be that single-chip microcontroller I/O interface, which can be constantly in a kind of level state,
Low level), if the state be exactly in open load heating level, can make relay under the control of single-chip microcontroller always
Be continuously in the state of being powered on so that load be constantly in heated condition, cause unnecessary machine breakdown or personnel by
The serious consequence of wound, there is great security risks.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of clever structure is simple, can in single-chip microcontroller therefore
The relay driving for household electrical appliances that timely protective effect is played when barrier protects circuit.
To achieve the above object, scheme provided by the invention are as follows: a kind of relay driving protection circuit for household electrical appliances, packet
Single-chip microcontroller, first resistor R1, second resistance R2, first diode D1, the second diode D2, first capacitor C1, the second electricity are included
Hold C2, triode Q1 and relay, wherein the output pin of the single-chip microcontroller is by the first capacitor C1 respectively with first
The cathode of the anode of diode D1 and the second diode D2 are connected, and the cathode of the first diode D1 is electric with second respectively
Hold C2 one end be connected with one end of first resistor R1, the other end of the first resistor R1 respectively with second resistance R2 and three
The base stage of pole pipe is connected；The anode of the second diode D2, the other end of the second capacitor C2, second resistance R2 the other end
And the emitter of triode is grounded；The collector of the triode is connected with the coil of relay, meanwhile, the relay
The other end of the coil of device is connected with the power supply being preset with, wherein the coil of the relay is also parallel with two pole of an afterflow
Pipe.
Further, the first capacitor C1 is polarity free capacitor, and the second capacitor C2 is electrolytic capacitor.
Further, the triode is NPN type triode.
Compared with the prior art, the beneficial effect of the present invention is that the characteristic of the blocking circulation exchange by first capacitor C1, makes
Triode can be made to cut no matter its output pin persistently exports high level signal or low level signal all when obtaining single-chip microcontroller failure
Only, it to interrupt to the power supply of relay coil so that the load that relay is controlled stops working, effectively avoids such as electricity
Continuous heating when the electric heating class household electrical appliances such as hot stove are supported on single-chip microcontroller failure and the problem of cause safety.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Fig. 2 is flow chart of the invention.
Wherein, 1- single-chip microcontroller, 2- coil, R1- first resistor, R2- second resistance, D1- first diode, D2- the two or two
Pole pipe, C1- first capacitor, the second capacitor of C2-, Q1- triode.
Specific embodiment
The present invention is further explained in the light of specific embodiments:
Referring to shown in attached drawing 1 and attached drawing 2, it includes monolithic that the present invention, which is a kind of relay driving protection circuit for household electrical appliances,
Machine 1, relay and the relay drive circuit being set between single-chip microcontroller 1 and relay, wherein relay drive circuit by
First resistor R1, second resistance R2, first diode D1, the second diode D2, first capacitor C1, the second capacitor C2, triode
Q1 composition；Associated control signal is exported to relay drive circuit by the I/O pin of single-chip microcontroller 1, is driven by relay drive circuit
Motor type relay carries out relevant work, realizes the job control for the load (for small household appliances) being connected with relay.
In the present embodiment, specifically, the I/O pin of single-chip microcontroller 1 is (i.e. for exporting control level signal to control relay
The output pin of device) it is connected respectively with the cathode of the anode of first diode D1 and the second diode D2 by first capacitor C1
It connects, and the cathode of first diode D1 is connected with one end of one end of the second capacitor C2 and first resistor R1 respectively, the first electricity
The other end of resistance R1 is connected with the base stage of second resistance R2 and triode respectively；Anode, the second capacitor of second diode D2
The other end (i.e. the one end not connect with first diode D1 in the second capacitor C2) of C2, second resistance R2 the other end (i.e.
The one end not connect with first resistor R1 in second resistance R2) and the emitter of triode be grounded；The collector of triode
It is connected with the coil 2 of relay, meanwhile, the other end of the coil 2 of relay is connected with the power supply being preset with.
The working principle of the present embodiment is as follows,
When single-chip microcontroller 1 is in normal working condition, from the I/O pin of single-chip microcontroller 1 output pulse signal (in this implementation
In example, pulse signal is 4K frequency square wave signal), there is the spy of blocking circulation exchange by first capacitor C1(capacitor
Property), wherein when the I/O pin of single-chip microcontroller 1 exports high level signal, first capacitor C1 is in charged state, at this point, the first electricity
Hold C1 and export electric current to first diode D1, electric current flows to the base stage of triode so that triode by first diode D1
Saturation conduction makes the relevant contacts control loaded work piece of the work attracting electric relay of coil 2 of relay in turn, meanwhile, from the first electricity
The electric current for holding C1 output also passes through first diode D1 and exports to the second capacitor C2, so that the second capacitor C2 is charged, works as monolithic
When the I/O pin conversion output low level signal of machine 1, first capacitor C1 is converted to discharge condition, at this point, at the second diode D2
In on state (one end for being equivalent to first capacitor C1 is grounded), and first diode D1 is in off state, is disconnected indirectly
The connection of the I/O pin and transistor base of single-chip microcontroller 1 carries out electric discharge by the second capacitor C2 at this time and thinks that transistor base exports
Conducting electric current is so that triode remains conducting, i.e., so that the coil 2 of relay keeps normal working condition；Pass through
Such structure so that after single-chip microcontroller 1 receives work order, pulse signal is exported i.e. by its I/O pin may make after
The relevant contacts closure of electric appliance realizes the job control of load.
When single-chip microcontroller 1 is in malfunction, the I/O pin of single-chip microcontroller 1 persistently exports high level signal or low level letter
Number when, since the blocking circulation AC characteristic of first capacitor C1 makes the voltage of first capacitor C1 and the I/O pin of single-chip microcontroller 1
No longer charge or discharge, triode is now in off state to disconnect the coil to relay after output voltage is close
2 power supply, relay are in off working state, that is, are disconnected the power supply of load, to make load terminate work, to effectively keep away
Exempt from safety problem caused by load continuous work (especially for electric heating class household electrical appliances, since the failure of single-chip microcontroller 1 causes electric heating class
Household electrical appliances continue not stop heating, and will cause serious consequence)；Through this structure, when single-chip microcontroller 1 is in malfunction,
When I/O pin persistently exports a kind of level state signal, since the partition of first capacitor C1 acts on, so that relay drive circuit
So that the relevant contacts of relay disconnect, load stops working no operating current.
In the present embodiment, first capacitor C1 is polarity free capacitor, and the second capacitor C2 is electrolytic capacitor.
In the present embodiment, triode is NPN type triode.
In the present embodiment, the coil 2 of relay is also parallel with a freewheeling diode.
In addition, it should be noted that, the specific embodiments described in this specification, each section title etc. can not
Together, the equivalent or simple change that all structure, feature and principles described according to the invention patent design are done, is included in the present invention
In the protection scope of patent.Those skilled in the art can do described specific embodiment various each
The mode that the modify or supplement or adopt of sample is similar substitutes, and without departing from structure of the invention or surmounts the claims
Defined range, is within the scope of protection of the invention.
Claims (3)
1. a kind of relay driving for household electrical appliances protects circuit, it is characterised in that: include single-chip microcontroller (1), first resistor R1,
Second resistance R2, first diode D1, the second diode D2, first capacitor C1, the second capacitor C2, triode Q1 and relay
Device, wherein the output pin of the single-chip microcontroller (1) by the first capacitor C1 respectively with the anode of first diode D1 and
The cathode of two diode D2 is connected, and the cathode of the first diode D1 is electric with one end of the second capacitor C2 and first respectively
One end of resistance R1 is connected, and the other end of the first resistor R1 is connected with the base stage of second resistance R2 and triode respectively；
The anode of the second diode D2, the other end of the second capacitor C2, second resistance R2 the other end and triode transmitting
Extremely it is grounded；The collector of the triode is connected with the coil (2) of relay, meanwhile, the coil (2) of the relay
The other end is connected with the power supply being preset with, wherein the coil (2) of the relay is also parallel with a freewheeling diode.
2. a kind of relay driving for household electrical appliances according to claim 1 protects circuit, it is characterised in that: described first
Capacitor C1 is polarity free capacitor, and the second capacitor C2 is electrolytic capacitor.
3. a kind of relay driving for household electrical appliances according to claim 1 protects circuit, it is characterised in that: three pole
Pipe is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456831.4A CN109494119A (en) | 2018-11-30 | 2018-11-30 | A kind of relay driving protection circuit for household electrical appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811456831.4A CN109494119A (en) | 2018-11-30 | 2018-11-30 | A kind of relay driving protection circuit for household electrical appliances |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109494119A true CN109494119A (en) | 2019-03-19 |
Family
ID=65699015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811456831.4A Pending CN109494119A (en) | 2018-11-30 | 2018-11-30 | A kind of relay driving protection circuit for household electrical appliances |
Country Status (1)
| Country | Link |
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| CN (1) | CN109494119A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202996719U (en) * | 2012-11-13 | 2013-06-12 | 佛山市顺德区瑞德电子实业有限公司 | Relay drive circuit with double protection loops |
| CN203787351U (en) * | 2013-12-30 | 2014-08-20 | 广东瑞德智能科技股份有限公司 | Relay drive circuit |
| CN203895363U (en) * | 2014-05-09 | 2014-10-22 | 杭州和而泰智能控制技术有限公司 | Driving and switch state detection circuit of relay |
| CN104916492A (en) * | 2015-06-15 | 2015-09-16 | 成都广迈科技有限公司 | Relay control circuit |
| CN205863094U (en) * | 2016-05-31 | 2017-01-04 | 浙江曼瑞德舒适系统有限公司 | A kind of drive circuit of single-chip microcomputer output control relay |
| CN208738139U (en) * | 2018-06-27 | 2019-04-12 | 深圳市盈硕电子有限公司 | A kind of control relay circuit and relay control device |
-
2018
- 2018-11-30 CN CN201811456831.4A patent/CN109494119A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202996719U (en) * | 2012-11-13 | 2013-06-12 | 佛山市顺德区瑞德电子实业有限公司 | Relay drive circuit with double protection loops |
| CN203787351U (en) * | 2013-12-30 | 2014-08-20 | 广东瑞德智能科技股份有限公司 | Relay drive circuit |
| CN203895363U (en) * | 2014-05-09 | 2014-10-22 | 杭州和而泰智能控制技术有限公司 | Driving and switch state detection circuit of relay |
| CN104916492A (en) * | 2015-06-15 | 2015-09-16 | 成都广迈科技有限公司 | Relay control circuit |
| CN205863094U (en) * | 2016-05-31 | 2017-01-04 | 浙江曼瑞德舒适系统有限公司 | A kind of drive circuit of single-chip microcomputer output control relay |
| CN208738139U (en) * | 2018-06-27 | 2019-04-12 | 深圳市盈硕电子有限公司 | A kind of control relay circuit and relay control device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190319 |
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| RJ01 | Rejection of invention patent application after publication |