CN204000325U - A kind of washing machine door switch detection circuit - Google Patents
A kind of washing machine door switch detection circuit Download PDFInfo
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- CN204000325U CN204000325U CN201420468984.1U CN201420468984U CN204000325U CN 204000325 U CN204000325 U CN 204000325U CN 201420468984 U CN201420468984 U CN 201420468984U CN 204000325 U CN204000325 U CN 204000325U
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- washing machine
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- door switch
- switch detection
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Abstract
The utility model discloses a kind of washing machine door switch detection circuit, comprise doorframe circuit and dodge gate circuit.Do a kind of simple one-way communication by transmitting the signal of telecommunication, transmit electric flux and communication signal by two magnetic cores.Utilize spiral PCB layout to replace the enamel-covered wire of traditional instrument transformer, the uniformity of raising product, reduces volume, and reduction procedure is implemented.Simultaneously owing to not being to adopt binary states switch, and only in the time that electric current sequential meets the requirements, just to think and close, safety and reliability is all higher.
Description
Technical field
The utility model relates to washing machine technical field, relates to specifically a kind of washing machine door switch detection circuit.
Background technology
Washing machine has entered huge numbers of families at present, but washing machine still exists the problem of a safe handling, particularly occurs after the lethal event of laundry machine dehydration, and everybody has paid attention to more to the security of washing machine.The reliability of well-known door switch is very important to the safe handling of washing machine, and the door switch of washing machine adopts machine door switch more.When there are two kinds of possibilities after machine door switch failure, one is to connect, and another kind is to disconnect, and the state of one of them is judged by accident exactly.That is to say, once switch lost efficacy, False Rate is 50%, and this will be caused danger.Such as in the situation that door switch lost efficacy, washing machine dewaters in the situation that door is opened, and clothing can fly out to hurt sb.'s feelings.If roller washing machine discharges water in the situation that door does not shut, the ground that also can do is water everywhere, causes the danger of getting an electric shock.Therefore be necessary very much whether the inefficacy of washing machine door switch is detected, and prior art centering also do not have effective solution to this.
Utility model content
The utility model aims to provide and a kind ofly can effectively detect the clothing gate switch detection circuit whether washing machine door switch lost efficacy.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of washing machine door switch detection circuit, comprise doorframe circuit and dodge gate circuit, described doorframe circuit comprises successively the first signal generating unit that connects and the first transformer unit and the current detecting unit for detection of current parameters between described first signal generating unit and described the first transformer unit.
Described dodge gate circuit comprises the second transformer unit, rectification circuit unit, secondary signal generating unit, diode D1, resistance R 1, triode Q1, described the second transformer unit is connected with described rectification circuit unit, the first output of described rectification circuit unit is connected with the colelctor electrode of described triode Q1 by described resistance R 1 is rear, the first output of described rectification circuit unit is by being connected with the first input end of described secondary signal generating unit with after the positive pole of described diode D1, the second output of described rectification circuit unit is connected with the second input of described secondary signal generating unit, the second output of described rectification circuit unit is connected with the emitter stage of described triode Q1, the output of described secondary signal generating unit is connected with the base stage of described triode Q1.
Wherein said doorframe circuit is arranged on the fixing doorframe of washing machine, and described dodge gate circuit is fixed on the dodge gate of washing machine, and described the first transformer unit and described the second transformer unit are relative during in closed condition at the dodge gate of washing machine.
Further also comprise centralized control unit, described current detecting unit sends current detecting information to described centralized control unit.
Described the first transformer unit is open magnetic core further, is wound with coil above.
Described the second transformer unit is FERRITE CORE further.
Described first signal generating unit generation frequency is the AC signal that 100KHz, amplitude are 5V further.
The described secondary signal generating unit generation cycle is 10ms further, the signal that pulsewidth is 1ms.
Described triode Q1 is NPN type triode further.
Described rectification circuit unit is bridge rectifier further.
Described centralized control unit is single-chip microcomputer further.
The resistance of described resistance R 1 is 10 Ω further.
Adopt technique scheme, the utility model at least comprises following beneficial effect:
Washing machine door switch detection circuit described in the utility model, comprises doorframe circuit and dodge gate circuit.Do a kind of simple one-way communication by transmitting the signal of telecommunication, transmit electric flux and communication signal by two magnetic cores.Utilize spiral PCB layout to replace the enamel-covered wire of traditional instrument transformer, the uniformity of raising product, reduces volume, and reduction procedure is implemented.Simultaneously owing to not being to adopt binary states switch, and only in the time that electric current sequential meets the requirements, just to think and close, safety and reliability is all higher.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of washing machine door switch detection circuit described in the utility model;
Fig. 2 is the scheme of installation of washing machine door switch detection circuit described in the utility model.
Wherein: 1. fixing doorframe, 2. dodge gate, 11. first transformer units, 21. second transformer units.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As depicted in figs. 1 and 2, for meeting a kind of washing machine door switch detection circuit of the present utility model, comprise doorframe circuit and dodge gate circuit, described doorframe circuit comprises successively the first signal generating unit that connects and the first transformer unit 11 and the current detecting unit for detection of current parameters between described first signal generating unit and described the first transformer unit 11.
Described dodge gate circuit comprises the second transformer unit 21, rectification circuit unit, secondary signal generating unit, diode D1, resistance R 1, triode Q1, described the second transformer unit 21 is connected with described rectification circuit unit, the first output of described rectification circuit unit is connected with the colelctor electrode of described triode Q1 by described resistance R 1 is rear, the first output of described rectification circuit unit is by being connected with the first input end of described secondary signal generating unit with after the positive pole of described diode D1, the second output of described rectification circuit unit is connected with the second input of described secondary signal generating unit, the second output of described rectification circuit unit is connected with the emitter stage of described triode Q1, the output of described secondary signal generating unit is connected with the base stage of described triode Q1.
As shown in Figure 2, wherein said doorframe circuit is arranged on the fixing doorframe 1 of washing machine, described dodge gate circuit is fixed on the dodge gate 2 of washing machine, and described the first transformer unit 11 and described the second transformer unit 21 are relative during in closed condition at the dodge gate of washing machine.As long as ensure that described the first transformer unit 11 and described the second transformer unit 21 are relative during in closed condition at the dodge gate of washing machine, the installation site of other circuit structure is strictly restriction not.
The present embodiment also comprises centralized control unit, and described current detecting unit sends current detecting information to described centralized control unit.The installation site of described centralized control unit can be on described fixing doorframe 1, also can be in other position, and the present embodiment is not construed as limiting this.The current information that described centralized control unit arrives by analyzing and testing, can determine that whether door of washing machine is in closed condition, simultaneously in conjunction with other hardware handles structures on washing machine, just can determine whether door of washing machine lost efficacy.Because other hardware handles structures on washing machine are conventional setting of the prior art, therefore the present embodiment is not construed as limiting this.
Described the first transformer unit 11 is open magnetic core, is wound with coil above, and described the second transformer unit 21 is FERRITE CORE, utilize spiral PCB layout to replace the enamel-covered wire of traditional instrument transformer, can improve the uniformity of product, reduction volume, reduction procedure is implemented.
Preferably described first signal generating unit generation frequency is the AC signal that 100KHz, amplitude are 5V, the described secondary signal generating unit generation cycle is 10ms, pulsewidth is the signal of 1ms, described triode Q1 is NPN type triode, described rectification circuit unit is bridge rectifier, described centralized control unit is single-chip microcomputer, and the resistance of described resistance R 1 is 10 Ω.Because described first signal generating unit, described current detecting unit, described secondary signal generating unit are those skilled in the art's routine techniques means, those skilled in the art should know, so locate to repeat no more.
The operation principle of the present embodiment is: when work, first switch on to washing machine, start working the described first signal circuit for generating unit of being located on fixing doorframe 1, producing a frequency is 100KHz, amplitude is the AC signal of 5V, by described the first transformer unit 11, electric energy is delivered to described the second transformer unit 21 by magnetic field, the voltage commutation of described the second transformer unit 21 is become direct current by described rectification circuit unit, give described secondary signal circuit for generating, the described secondary signal circuit for generating generation cycle is 10ms, pulsewidth is the signal of 1ms, go to control the conducting of 10 Ω resistance with this signal, because the electric current of 10 Ω resistance is greater than the electric current that described secondary signal circuit for generating consumes, so the fluctuating current of this switch clearly.The electric current of this fluctuation arrives described the first transformer unit 11 by magnetic Field Coupling, and can detect easily this width by described current detecting unit is 1ms, the current signal that the cycle is 10ms.This current signal is delivered to centralized control unit and just can separate the state of readout gate.
Washing machine door switch detection circuit described in the present embodiment, comprises doorframe circuit and dodge gate circuit.Do a kind of simple one-way communication by transmitting the signal of telecommunication, transmit electric flux and communication signal by two magnetic cores.Utilize spiral PCB layout to replace the enamel-covered wire of instrument transformer, the uniformity of raising product, reduces volume, and reduction procedure is implemented.Simultaneously owing to not being to adopt binary states switch, and only in the time that electric current sequential meets the requirements, just to think and close, safety and reliability is all higher.
Above an embodiment of the present utility model is had been described in detail, but the preferred embodiment that described content is only created for the utility model can not be considered to for limiting practical range of the present utility model.All any equivalent variations of doing according to the utility model application range, all should be still within patent covering scope of the present utility model.
Claims (10)
1. a washing machine door switch detection circuit, it is characterized in that, comprise doorframe circuit and dodge gate circuit, described doorframe circuit comprises successively the first signal generating unit that connects and the first transformer unit and the current detecting unit for detection of current parameters between described first signal generating unit and described the first transformer unit;
Described dodge gate circuit comprises the second transformer unit, rectification circuit unit, secondary signal generating unit, diode D1, resistance R 1, triode Q1, described the second transformer unit is connected with described rectification circuit unit, the first output of described rectification circuit unit is connected with the colelctor electrode of described triode Q1 by described resistance R 1 is rear, the first output of described rectification circuit unit is by being connected with the first input end of described secondary signal generating unit with after the positive pole of described diode D1, the second output of described rectification circuit unit is connected with the second input of described secondary signal generating unit, the second output of described rectification circuit unit is connected with the emitter stage of described triode Q1, the output of described secondary signal generating unit is connected with the base stage of described triode Q1,
Wherein said doorframe circuit is arranged on the fixing doorframe of washing machine, and described dodge gate circuit is fixed on the dodge gate of washing machine, and described the first transformer unit and described the second transformer unit are relative during in closed condition at the dodge gate of washing machine.
2. washing machine door switch detection circuit as claimed in claim 1, is characterized in that: also comprise centralized control unit, described current detecting unit sends current detecting information to described centralized control unit.
3. washing machine door switch detection circuit as claimed in claim 2, is characterized in that: described the first transformer unit is open magnetic core, is wound with coil above.
4. washing machine door switch detection circuit as claimed in claim 3, is characterized in that: described the second transformer unit is FERRITE CORE.
5. washing machine door switch detection circuit as claimed in claim 4, is characterized in that: it is the AC signal that 100KHz, amplitude are 5V that described first signal generating unit produces frequency.
6. washing machine door switch detection circuit as claimed in claim 5, is characterized in that: the described secondary signal generating unit generation cycle is 10ms, the signal that pulsewidth is 1ms.
7. the washing machine door switch detection circuit as described in as arbitrary in claim 1-6, is characterized in that: described triode Q1 is NPN type triode.
8. washing machine door switch detection circuit as claimed in claim 7, is characterized in that: described rectification circuit unit is bridge rectifier.
9. washing machine door switch detection circuit as claimed in claim 8, is characterized in that: described centralized control unit is single-chip microcomputer.
10. washing machine door switch detection circuit as claimed in claim 9, is characterized in that: the resistance of described resistance R 1 is 10 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420468984.1U CN204000325U (en) | 2014-08-19 | 2014-08-19 | A kind of washing machine door switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420468984.1U CN204000325U (en) | 2014-08-19 | 2014-08-19 | A kind of washing machine door switch detection circuit |
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| Publication Number | Publication Date |
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| CN204000325U true CN204000325U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420468984.1U Active CN204000325U (en) | 2014-08-19 | 2014-08-19 | A kind of washing machine door switch detection circuit |
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| CN (1) | CN204000325U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237085A (en) * | 2016-03-29 | 2017-10-10 | 无锡小天鹅股份有限公司 | Rotary drum washing machine |
| CN109044226A (en) * | 2018-06-06 | 2018-12-21 | 佛山市顺德区美的洗涤电器制造有限公司 | Door switch circuit and washing electric appliance |
-
2014
- 2014-08-19 CN CN201420468984.1U patent/CN204000325U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237085A (en) * | 2016-03-29 | 2017-10-10 | 无锡小天鹅股份有限公司 | Rotary drum washing machine |
| CN107237085B (en) * | 2016-03-29 | 2019-05-21 | 无锡小天鹅股份有限公司 | Rotary drum washing machine |
| CN109044226A (en) * | 2018-06-06 | 2018-12-21 | 佛山市顺德区美的洗涤电器制造有限公司 | Door switch circuit and washing electric appliance |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 215000 No. 111 Kangyuan Road, Xiangcheng Economic Development Zone, Suzhou City, Jiangsu Province Patentee after: Jiangsu Xin'an Electrical Appliance Co., Ltd. Address before: 215131 No. 111 Kangyuan Road, Xiangcheng District, Suzhou City, Jiangsu Province Patentee before: Jiangsu Simand Electrical Appliance Co., Ltd. |