CN202839463U - Relay control circuit and electric cooker - Google Patents
Relay control circuit and electric cooker Download PDFInfo
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- CN202839463U CN202839463U CN 201220423235 CN201220423235U CN202839463U CN 202839463 U CN202839463 U CN 202839463U CN 201220423235 CN201220423235 CN 201220423235 CN 201220423235 U CN201220423235 U CN 201220423235U CN 202839463 U CN202839463 U CN 202839463U
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Abstract
The utility model discloses a relay control circuit and an electric cooker. The relay control circuit comprises a control chip, a first triode, a second triode, a first diode and a relay; a first input end of the relay is connected to a power supply positive pole, and a second input end of the relay is connected to a collector of the first triode; an emitter of the first triode is connected to a collector of the second triode, and a base pole of the first triode is connected with a negative pole of the first diode through a first current-limiting resistor; and a base pole of the second triode is respectively connected with the control chip and a positive pole of the first diode respectively through a second current-limiting resistor, and an emitter of the second triode is connected with a power supply negative pole. Because two triodes are connected in series in a circuit, if any one of the triodes is in a short-circuit state and is failed, the control chip can control the other triode and enable the same to be in a non-conducting state, such that the relay can be switched off, and a normal-closed state of the relay caused by the out-of-control state of the relay can be avoided, and therefore failure rate can be reduced, and reliability can be improved.
Description
Technical field
The utility model relates to the electric heating appliance technical field, especially relates to a kind of control relay circuit and electric cooker.
Background technology
In small household appliances field, particularly electric cooker, pressure cooker, slow cooker, fry in shallow oil the electric heating appliances such as roasting machine, steamer, the closure that generally drives relay by control chip and triode is come the heating of control heater.If triode inefficacy short circuit, relay can be normally closed, heater will continuous heating out of hand, tends to like this cause household electrical appliances to damage even danger on fire.Simultaneously, new China Compulsory Product Certification (China Compulsory Certification, CCC) the relevant provision B4706.1-2005 in the safety standard requires: electronically controlled electric heating appliance, when some component failure wherein, the heating element heating of should not switching on is to guarantee the fail safe of product under abnormal condition.Be to increase the security performance of electric heating household electrical appliances, need to increase the relay fault detect guarantee relay can be controlled or other means improve the reliability of relay control circuit, to reduce the inefficacy probability of relay control circuit.
Fig. 1 is existing Control technical scheme, by triode Q1 of an I/O port controlling of control chip, drives relay K 1 and opens and closes.But the failure rate of this control relay circuit is high, reliability is relatively poor, in case triode Q1 inefficacy short circuit, relay K 1 is with the closure state that is in out of hand always, and the heater that driven by relay K 1 will heat always, seriously burn out electrical equipment even cause fire.
The utility model content
Main purpose of the present utility model is to provide that a kind of failure rate is low, reliability is high, the simple control relay circuit of circuit.
For realizing above purpose, the utility model proposes a kind of control relay circuit, this control relay circuit comprises control chip, the first triode, the second triode, the first diode and relay; The first input end of described relay connects positive source, and the second input connects the collector electrode of the first triode; The emitter of described the first triode connects the collector electrode of the second triode, and base stage connects the negative electrode of the first diode by the first current-limiting resistance; The base stage of described the second triode connects respectively the anode of control chip and the first diode by the second current-limiting resistance, and emitter connects power cathode.
Preferably, also connect at least one the 3rd triode between the collector electrode of the emitter of described the first triode and the second triode.
Preferably, the collector electrode of described the 3rd triode connects the emitter of the first triode, and base stage connects the anode of the first diode by the 3rd current-limiting resistance, and emitter connects the collector electrode of the second triode.
Preferably, also comprise the second diode that is connected between the first current-limiting resistance and the first diode, the negative electrode of this second diode connects the first current-limiting resistance, the negative electrode of anodic bonding the first diode.
Preferably, the collector electrode of described the 3rd triode connects the emitter of the first triode, and base stage connects the negative electrode of the first diode by the 3rd current-limiting resistance, and emitter connects the collector electrode of the second triode.
Preferably, also comprise the second diode that is connected between the first diode and the second current-limiting resistance, the anode of this second diode connects respectively the second current-limiting resistance and control chip, and negative electrode connects the anode of the first diode.
The utility model proposes a kind of electric cooker simultaneously, and this electric cooker comprises a control circuit, and described control circuit comprises control chip, the first triode, the second triode, the first diode and relay; The first input end of described relay connects positive source, and the second input connects the collector electrode of the first triode; The emitter of described the first triode connects the collector electrode of the second triode, and base stage connects the negative electrode of the first diode by the first current-limiting resistance; The base stage of described the second triode connects respectively the anode of control chip and the first diode by the second current-limiting resistance, and emitter connects power cathode.
A kind of control relay circuit provided by the utility model and electric cooker, owing to be connected in series two triodes, wherein any one triode inefficacy short circuit, control chip can both be controlled another not conducting of triode, thereby relay is disconnected, avoid relay uncontrolled and normally closed, therefore reduced failure rate, improved reliability; Even when the I/O port of control chip lost efficacy, the short circuit of also losing efficacy of the collector electrode of the first triode and base stage, the first diode also can effectively be protected control chip and the second triode, has further improved the reliability of circuit, has played the effect of reverse fail safe.
Description of drawings
Fig. 1 is the circuit diagram of prior art repeat circuit control circuit;
Fig. 2 is the circuit diagram of control relay circuit the first embodiment of the present utility model;
Fig. 3 is the circuit diagram of control relay circuit the second embodiment of the present utility model;
Fig. 4 is the circuit diagram of Control short circuit the 3rd embodiment of the present utility model.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Referring to control relay circuit of the present utility model the first embodiment shown in Figure 2.The control relay circuit of present embodiment comprises control chip, the first triode Q11, the second triode Q12, the first diode D11 and relay K 11, and wherein control chip is drawn an I/O port; First input end connection+12V the voltage of described relay K 11 also is positive source, and the second input connects the collector electrode of the first triode Q11; Described the first triode Q11 emitter connects the collector electrode of the second triode Q12, and base stage connects the negative electrode of the first diode D11 by the first current-limiting resistance R11; The base stage of described the second triode Q12 connects respectively the I/O port of control chip and the anode of the first diode D11 by the second current-limiting resistance R12, and grounded emitter also is power cathode.
Under normal circumstances, when the I/O port is output as low level, the first triode Q11, second not conductings of triode Q12, relay K 11 disconnects; When the I/O port is output as high level, the first triode Q11, second all conductings of triode Q12, relay K 11 closures; If wherein any one triode inefficacy short circuit then still can be controlled another not conducting of triode during I/O port output low level, thereby relay K 11 is disconnected, it is closed to prevent that relay K 11 from continuing; Even when the I/O port lost efficacy, and the short circuit of also losing efficacy of the collector electrode of the first triode Q11 and base stage, the first diode D11 also can effectively protect control chip and the second triode Q12, has further improved the reliability of circuit, plays the effect of reverse fail safe.Therefore the control relay circuit of present embodiment satisfies the requirement of new CCC safety standard GB4706.1-2005 relevant provision: electronically controlled electric heating appliance, when wherein some components and parts lost efficacy, the heating element heating of should not switching on is to guarantee the fail safe of product under abnormal condition.The Electronic Control that the Control short circuit of present embodiment is applicable to electric cooker, pressure cooker, slow cooker, fries in shallow oil heater in the electric heating appliances such as roasting machine, steamer, failure risk that can the Effective Raise relay circuit, prevent triode lost efficacy after relay continuous heating and causing the accident, reduced on the whole failure rate, improved reliability, and circuit is simple, thereby cost is lower.
Referring to control relay circuit of the present utility model the second embodiment shown in Figure 3.Present embodiment is to have increased the 3rd a triode Q13 on the basis of the first embodiment, and described the 3rd triode Q13 is connected between the collector electrode of the emitter of the first triode Q11 and the second triode Q12; The collector electrode of described the 3rd triode Q13 connects the emitter of the first triode Q11, and base stage connects the anode of the first diode D11 by the 3rd current-limiting resistance R13, and emitter connects the collector electrode of the second triode Q12.Under normal condition, when the I/O port was output as high level, three triodes all can conducting, relay K 11 closures; When the I/O port is output as low level, the first triode Q11, the second triode Q12 and the 3rd not conductings of triode Q13, relay K 11 disconnects; If wherein any one triode inefficacy short circuit, I/O port output low level still can be controlled other two not conductings of triode, thereby makes relay K 11 disconnect protective circuit; The short circuit even the first triode Q11 and the second triode Q12 lost efficacy simultaneously, I/O port output low level still can be controlled the 3rd not conducting of triode Q13; Even perhaps the second triode Q12 and the 3rd triode Q13 short circuit of losing efficacy simultaneously, I/O port output low level still can be controlled the first not conducting of triode Q11.Thereby, further reduced the failure rate of circuit, improved reliability.
Further, in above-mentioned first, second embodiment, can also connect one second diode (not shown) between the first current-limiting resistance R11 and the first diode D11, the negative electrode of this second diode connects the first current-limiting resistance R11, the negative electrode of anodic bonding the first diode D11.Among first, second embodiment, if when the first diode D11 and the first triode Q11 lost efficacy short circuit simultaneously, might cause relay K 11 uncontrolled and normally closed, if when this moment, the I/O port also lost efficacy, control chip just might be damaged.But after adding the second diode, just can prevent the generation of above accident, during any one diode fails short circuit, another diode also can continue to protect whole circuit, thereby has further improved the reliability of control relay circuit.
Referring to control relay circuit of the present utility model the 3rd embodiment shown in Figure 4.Present embodiment is with respect to the 3rd embodiment, and the base stage that difference is the 3rd triode Q13 connects the negative electrode of the first diode D11 but not anode by the 3rd current-limiting resistance R13.Concrete, described the 3rd triode Q13 is connected between the collector electrode of the emitter of the first triode Q11 and the second triode Q12; The collector electrode of described the 3rd triode Q13 connects the emitter of the first triode Q11, and base stage connects the negative electrode of the first diode D11 by the 3rd current-limiting resistance R13, and emitter connects the collector electrode of the second triode Q12.In the present embodiment, the short circuit even any two triodes lost efficacy simultaneously, I/O port output low level still can be controlled the not conducting of another one triode.
Further, can between the first diode D11 and the second current-limiting resistance R12, connect one second diode (not shown) equally, the anode of this second diode connects respectively the second current-limiting resistance R12 and control chip, and negative electrode connects the anode of the first diode D11.Thereby when any one diode fails short circuit, another diode also can continue to protect whole circuit, has further improved the reliability of control relay circuit.
Above-mentioned second, third embodiment has increased the 3rd a triode Q13 between the first triode Q11 and the second triode Q12, in fact can increase as required a plurality of the 3rd triodes, and triode of every increase, the failure rate of whole circuit just further reduces, and reliability just further increases.
Present embodiment proposes a kind of electric cooker simultaneously, and this electric cooker comprises a control relay circuit, and described control relay circuit comprises control chip, the first triode, the second triode, the first diode and relay; The first input end of described relay connects positive source, and the second input connects the collector electrode of the first triode; The emitter of described the first triode connects the collector electrode of the second triode, and base stage connects the negative electrode of the first diode by the first current-limiting resistance; The base stage of described the second triode connects respectively the anode of control chip and the first diode by the second current-limiting resistance, and emitter connects power cathode.Control relay circuit described in the present embodiment is the related control relay circuit of above-described embodiment in the utility model, does not repeat them here.
Should be understood that; it below only is preferred embodiment of the present utility model; can not therefore limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (7)
1. the control relay circuit of an electric heating appliance is characterized in that, comprises control chip, the first triode, the second triode, the first diode and relay; The first input end of described relay connects positive source, and the second input connects the collector electrode of the first triode; The emitter of described the first triode connects the collector electrode of the second triode, and base stage connects the negative electrode of the first diode by the first current-limiting resistance; The base stage of described the second triode connects respectively the anode of control chip and the first diode by the second current-limiting resistance, and emitter connects power cathode.
2. control relay circuit according to claim 1 is characterized in that, also connects at least one the 3rd triode between the collector electrode of the emitter of described the first triode and the second triode.
3. control relay circuit according to claim 2, it is characterized in that, the collector electrode of described the 3rd triode connects the emitter of the first triode, and base stage connects the anode of the first diode by the 3rd current-limiting resistance, and emitter connects the collector electrode of the second triode.
4. each described control relay circuit according to claim 1-3, it is characterized in that, also comprise the second diode that is connected between the first current-limiting resistance and the first diode, the negative electrode of this second diode connects the first current-limiting resistance, the negative electrode of anodic bonding the first diode.
5. control relay circuit according to claim 2, it is characterized in that, the collector electrode of described the 3rd triode connects the emitter of the first triode, and base stage connects the negative electrode of the first diode by the 3rd current-limiting resistance, and emitter connects the collector electrode of the second triode.
6. control relay circuit according to claim 5, it is characterized in that, also comprise the second diode that is connected between the first diode and the second current-limiting resistance, the anode of this second diode connects respectively the second current-limiting resistance and control chip, and negative electrode connects the anode of the first diode.
7. an electric cooker comprises a control relay circuit, it is characterized in that, described control relay circuit is such as each described control relay circuit of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220423235 CN202839463U (en) | 2012-08-23 | 2012-08-23 | Relay control circuit and electric cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220423235 CN202839463U (en) | 2012-08-23 | 2012-08-23 | Relay control circuit and electric cooker |
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| CN202839463U true CN202839463U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220423235 Expired - Fee Related CN202839463U (en) | 2012-08-23 | 2012-08-23 | Relay control circuit and electric cooker |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469628A (en) * | 2015-08-17 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | For the protection control method of relay, device |
| CN106627038A (en) * | 2016-12-19 | 2017-05-10 | 杭州先途电子有限公司 | Heating switching circuit |
| CN107104022A (en) * | 2017-05-04 | 2017-08-29 | 安徽庆恒信息科技有限公司 | Novel intelligent electric cooker |
| CN108447734A (en) * | 2018-03-08 | 2018-08-24 | 厦门芯阳科技股份有限公司 | A kind of relay drive circuit and method of high reliability |
| CN109471025A (en) * | 2018-11-09 | 2019-03-15 | 四川赛科安全技术有限公司 | The method that twin voltage realizes electromagnetic relay wireline inspection and feedback signal detection |
| CN111110019A (en) * | 2018-10-31 | 2020-05-08 | 浙江苏泊尔家电制造有限公司 | Cooking appliance and control method thereof |
-
2012
- 2012-08-23 CN CN 201220423235 patent/CN202839463U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106469628A (en) * | 2015-08-17 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | For the protection control method of relay, device |
| CN106469628B (en) * | 2015-08-17 | 2019-05-31 | 佛山市顺德区美的电热电器制造有限公司 | For the protection control method of relay, device |
| CN106627038A (en) * | 2016-12-19 | 2017-05-10 | 杭州先途电子有限公司 | Heating switching circuit |
| CN107104022A (en) * | 2017-05-04 | 2017-08-29 | 安徽庆恒信息科技有限公司 | Novel intelligent electric cooker |
| CN108447734A (en) * | 2018-03-08 | 2018-08-24 | 厦门芯阳科技股份有限公司 | A kind of relay drive circuit and method of high reliability |
| CN111110019A (en) * | 2018-10-31 | 2020-05-08 | 浙江苏泊尔家电制造有限公司 | Cooking appliance and control method thereof |
| CN111110019B (en) * | 2018-10-31 | 2022-02-01 | 浙江苏泊尔家电制造有限公司 | Cooking appliance and control method thereof |
| CN109471025A (en) * | 2018-11-09 | 2019-03-15 | 四川赛科安全技术有限公司 | The method that twin voltage realizes electromagnetic relay wireline inspection and feedback signal detection |
| CN109471025B (en) * | 2018-11-09 | 2020-12-29 | 四川赛科安全技术有限公司 | Method for realizing electromagnetic relay line detection and feedback signal detection by double voltages |
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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 |
Granted publication date: 20130327 Termination date: 20200823 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |