CN203904725U - Door opening protecting circuit of washing machine - Google Patents
Door opening protecting circuit of washing machine Download PDFInfo
- Publication number
- CN203904725U CN203904725U CN201420343069.XU CN201420343069U CN203904725U CN 203904725 U CN203904725 U CN 203904725U CN 201420343069 U CN201420343069 U CN 201420343069U CN 203904725 U CN203904725 U CN 203904725U
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- washing machine
- circuit
- level signal
- door
- diode
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Abstract
The utility model discloses a door opening protecting circuit of a washing machine and is used for controlling connection and disconnection of a power circuit and an actuating mechanism of the washing machine. The protecting circuit comprises a photoelectric sensor, an AND gate circuit and a switching circuit, wherein the photoelectric sensor is used for detecting whether a door of the washing machine is closed or not, outputting a low-level signal when the door of the washing machine is closed and outputting a high-level signal when the door of the washing machine is open; a first input end of the AND gate circuit is connected with the photoelectric sensor, a second input end of the AND gate circuit is connected with a controller of the washing machine and used for receiving a high-level signal output by the controller of the washing machine, and the AND gate circuit is also used for performing AND operation on the level signals input by the photoelectric sensor and the high-level signal input by the controller of the washing machine and outputting a level signal; the switching circuit is connected with an output end of the AND gate circuit and used for controlling connection and disconnection of the power circuit and the actuating mechanism. The protecting circuit has the advantages of high reliability and capability of avoiding misjudgment, and the safety performance is greatly improved.
Description
Technical field
The utility model relates to refrigerator technical field, more particularly, and particularly a kind of holding circuit of opening the door of washing machine.
Background technology
Along with the continuous lifting of people's living standard, washing machine is widely used in the fields such as family.Washing machine generally all needs the door closure of washing machine to cut out when work; to reach protection user's (especially child) object; therefore clear and definite regulation in safety standard: the action of this class high speed rotating of forbidding dewatering when washing machine opens the door; especially for automatic washing machine; because its door closure can be opened at any time, more need a kind of holding circuit to make door closure when opening, cut off timely circuit to reach the object of protection user safety.
Two kinds of methods of available technology adopting solve above problem: first employing program judges to reach the object of timely cut-out circuit, it two is to adopt hardware circuit to reach the object of timely cut-out circuit, for first method, due to phenomenons such as the easy generating program mistakes of software program, easily make this generation erroneous judgement disconnected, and then cause can not be accurately and cut off timely circuit, and for second method, in prior art, exist reliability lower, the disconnected phenomenon of erroneous judgement also easily occurs.Therefore, be necessary to design a kind of holding circuit of opening the door of novel washing machine.
Utility model content
The purpose of this utility model is to provide that a kind of reliability is high, to avoid occurring erroneous judgement disconnected and improved greatly the holding circuit of opening the door of the washing machine of security performance.
In order to achieve the above object, the technical solution adopted in the utility model is as follows:
The holding circuit of opening the door of washing machine, for controlling power circuit and the conducting between executing agency and the shutoff of washing machine, the holding circuit of opening the door of described washing machine comprises,
Whether photoelectric sensor, close for detection of the door closure of washing machine, and export a low level signal when the door closure of washing machine is closed, and exports a high level signal when the door closure of washing machine is opened;
The AND circuit that first input end is connected with photoelectric sensor, the second input of described AND circuit is connected with the controller of washing machine, the high level signal of exporting for receiving the controller of washing machine, and this AND circuit is done and computing for the high level signal that the controller of the level signal of photoelectric sensor input and washing machine is inputted, and exports a level signal;
And the on-off circuit being connected with AND circuit output, for controlling conducting and the shutoff between power circuit and executing agency according to the level signal of AND circuit output.
Preferably, described on-off circuit comprises the first resistance, triode and relay, and described the first resistance is connected between the output of AND circuit and the base stage of triode; The colelctor electrode of described triode is connected with power supply VCC by the main coil of relay, its grounded emitter; The main contacts of described relay is connected between the output of power circuit and the input of executing agency.
Preferably, described AND circuit comprises the first diode, the second diode and the second resistance, the negative electrode of the negative electrode of described the first diode and the second diode is all connected with one end of the second resistance, the other end of described the second resistance is connected with power supply VCC, the anode of described the first diode is connected with the controller of washing machine, and the anode of described the second diode is connected with photoelectric sensor output.
Preferably, the dehydration electric motor that described executing agency is washing machine.
Compared with prior art, the utility model has the advantage of: the utility model carries out and computing level signal and a constant high level signal of photoelectric sensor output by AND circuit, by and computing after level signal driving switch circuit to control conducting and the shutoff between power circuit and executing agency, have advantages of that reliability is high, it is disconnected to avoid that erroneous judgement occurs, and improved greatly security performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the frame diagram of the holding circuit of opening the door of washing machine described in the utility model.
Fig. 2 is the circuit diagram of the holding circuit of opening the door of washing machine described in the utility model.
Fig. 3 is the circuit diagram of AND circuit in the holding circuit of opening the door of washing machine described in the utility model.
The specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that, protection domain of the present utility model is made to more explicit defining.
Embodiment
Consult shown in Fig. 1, the holding circuit of opening the door of a kind of washing machine that the present embodiment provides, for controlling the power circuit 4 of washing machine and conducting and the shutoff between executing agency 5, the holding circuit of opening the door of described washing machine comprises photoelectric sensor 1, whether the door closure for detection of washing machine closes, and when the door closure of washing machine is closed, export a low level signal, when opening, exports the door closure of washing machine a high level signal; The AND circuit 2 that first input end is connected with photoelectric sensor 1, the second input of described AND circuit 2 is connected with the controller of washing machine, the high level signal of exporting for receiving the controller of washing machine, and this AND circuit 2 is for high level signal work and the computing with the controller input of washing machine by the level signal of photoelectric sensor 1 input, and export a level signal; And the on-off circuit 3 being connected with AND circuit 2 outputs, for controlling conducting and the shutoff between power circuit 4 and executing agency 5 according to the level signal of AND circuit 2 outputs.
The principle of the holding circuit of opening the door of the washing machine of the present embodiment is: the level signal of inputting due to the second input of AND circuit 2 is high level, when the door closure that washing machine detected when photoelectric sensor 1 is closed, export a low level signal to the first input end of AND circuit 2, the high level signal of this low level signal and the second input is done and computing, be AND circuit 2 output one low level signals, this low level signal exports the input of on-off circuit 3 to, and on-off circuit 3 is controlled power circuit 4 and executing agency's 5 conductings again; When photoelectric sensor 1 detects the door closure unlatching of washing machine; export a high level signal to the first input end of AND circuit 2; the high level signal of this high level signal and the second input is done and computing; be AND circuit 2 output one high level signals; this high level signal exports the input of on-off circuit 3 to; on-off circuit 3 is controlled power circuit 4 again and is disconnected with executing agency 5, i.e. executing agency's 5 power-off, have played the effect of protection.And this circuit has passed through the dual control of AND circuit 2 and on-off circuit 3, have advantages of that reliability is high, it is disconnected to avoid that erroneous judgement occurs, and improved greatly security performance when washing machine uses.
Consult shown in Fig. 2, the on-off circuit 3 in the present embodiment comprises the first resistance R 1, triode Q1 and relay K 1, and wherein, the first resistance R 1 is connected between the output of AND circuit 2 and the base stage of triode Q1; The colelctor electrode of triode Q1 is connected with power supply VCC by the main coil of relay K 1, its grounded emitter; The main contacts of relay K 1 is connected between the output of power circuit 4 and the input of executing agency 5.
The operation principle of described on-off circuit 3 is: when the input low level signal of one end of the first resistance R 1, (door closure of washing machine is closed, AND circuit 2 output low level signals), not conducting of triode Q1, relay K 1 must not electricity (this relay K 1 be all the time in closure state), power circuit 4 with executing agency 5 in conducting state; When the input high level signal of one end of the first resistance R 1 (door closure of washing machine is opened, AND circuit 2 output high level signals), triode Q1 conducting; relay K 1 obtains electric; driving power circuit 4 disconnects with executing agency 5, i.e. the effect of protection has been played in executing agency's 5 power-off.
Consult shown in Fig. 3, AND circuit 2 in the present embodiment comprises the first diode D1, the second diode D2 and the second resistance R 2, wherein, the negative electrode of the negative electrode of the first diode D1 and the second diode D2 is all connected with one end of the second resistance R 2, the other end of the second resistance R 2 is connected with power supply VCC, the first anode of diode D1 and the controller of washing machine are connected, and the anode of the second diode D2 is connected with photoelectric sensor 1 output.
The operation principle of described AND circuit 2 is, the voltage of power supply VCC is 10v, as the first and second diode D1, when D2 is high level (as 3.3V), the first and second diode D1, the equal conducting of D2, be output OUT output high level signal (4V, due to D1, the conducting voltage of D2 is 0.7V), as the first and second diode D1, in D2, any is low level (0V), when another is high level (3.3V), the first and second diode D1, one in D2 in forward bias, another is in reverse bias, cause output OUT output low level signal (0.7V).
As preferably, when washing machine is automatic washing machine, executing agency 5 can be the dehydration electric motor of washing machine, and when washing machine is not automatic washing machine, and executing agency 5 can be washing motor, dehydration electric motor of washing machine etc.
Although described by reference to the accompanying drawings embodiment of the present utility model; but the patent owner can make various distortion or modification within the scope of the appended claims; as long as be no more than the described protection domain of claim of the present utility model, all should be within protection domain of the present utility model.
Claims (4)
1. the holding circuit of opening the door of washing machine, for controlling the power circuit (4) of washing machine and conducting and the shutoff between executing agency (5), is characterized in that: the holding circuit of opening the door of described washing machine comprises,
Whether photoelectric sensor (1), close for detection of the door closure of washing machine, and export a low level signal when the door closure of washing machine is closed, and exports a high level signal when the door closure of washing machine is opened;
The AND circuit (2) that first input end is connected with photoelectric sensor (1), the second input of described AND circuit (2) is connected with the controller of washing machine, the high level signal of exporting for receiving the controller of washing machine, and this AND circuit (2) is done and computing for the high level signal that the controller of the level signal of photoelectric sensor (1) input and washing machine is inputted, and exports a level signal;
And the on-off circuit (3) being connected with AND circuit (2) output, for controlling conducting and the shutoff between power circuit (4) and executing agency (5) according to the level signal of AND circuit (2) output.
2. the holding circuit of opening the door of washing machine according to claim 1, is characterized in that:
Described on-off circuit (3) comprises the first resistance (R1), triode (Q1) and relay (K1), and described the first resistance (R1) is connected between the output of AND circuit (2) and the base stage of triode (Q1); The colelctor electrode of described triode (Q1) is connected with power supply VCC by the main coil of relay (K1), its grounded emitter; The main contacts of described relay (K1) is connected between the output of power circuit (4) and the input of executing agency (5).
3. the holding circuit of opening the door of washing machine according to claim 2, is characterized in that:
Described AND circuit (2) comprises the first diode (D1), the second diode (D2) and the second resistance (R2), the negative electrode of the negative electrode of described the first diode (D1) and the second diode (D2) is all connected with one end of the second resistance (R2), the other end of described the second resistance (R2) is connected with power supply VCC, the anode of described the first diode (D1) is connected with the controller of washing machine, and the anode of described the second diode (D2) is connected with photoelectric sensor (1) output.
4. according to the holding circuit of opening the door of the washing machine described in claims 1 to 3 any one, it is characterized in that:
The dehydration electric motor that described executing agency (5) is washing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343069.XU CN203904725U (en) | 2014-06-25 | 2014-06-25 | Door opening protecting circuit of washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420343069.XU CN203904725U (en) | 2014-06-25 | 2014-06-25 | Door opening protecting circuit of washing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203904725U true CN203904725U (en) | 2014-10-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420343069.XU Expired - Fee Related CN203904725U (en) | 2014-06-25 | 2014-06-25 | Door opening protecting circuit of washing machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN203904725U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053112A (en) * | 2016-06-23 | 2016-10-26 | 安徽金帅洗衣机有限公司 | Method for checking safety performance of single-container washing machines |
| CN109477280A (en) * | 2016-07-19 | 2019-03-15 | Bsh家用电器有限公司 | Door Monitoring Circuits for Household Appliances |
| CN109828200A (en) * | 2019-03-01 | 2019-05-31 | 深圳和而泰智能控制股份有限公司 | A kind of method, apparatus and switch self-checking system of switch self-test |
| CN111286926A (en) * | 2020-03-06 | 2020-06-16 | 海信（山东）冰箱有限公司 | Washing machine |
| CN111380611A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Photoelectric sensing detection method and circuit applied to protective cover |
| CN115173359A (en) * | 2022-06-21 | 2022-10-11 | 歌尔光学科技有限公司 | Galvanometer driving circuit, control method and projector |
-
2014
- 2014-06-25 CN CN201420343069.XU patent/CN203904725U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053112A (en) * | 2016-06-23 | 2016-10-26 | 安徽金帅洗衣机有限公司 | Method for checking safety performance of single-container washing machines |
| CN109477280A (en) * | 2016-07-19 | 2019-03-15 | Bsh家用电器有限公司 | Door Monitoring Circuits for Household Appliances |
| CN109477280B (en) * | 2016-07-19 | 2021-02-02 | Bsh家用电器有限公司 | Door monitoring circuit for household appliance |
| CN111380611A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Photoelectric sensing detection method and circuit applied to protective cover |
| CN109828200A (en) * | 2019-03-01 | 2019-05-31 | 深圳和而泰智能控制股份有限公司 | A kind of method, apparatus and switch self-checking system of switch self-test |
| CN111286926A (en) * | 2020-03-06 | 2020-06-16 | 海信（山东）冰箱有限公司 | Washing machine |
| CN115173359A (en) * | 2022-06-21 | 2022-10-11 | 歌尔光学科技有限公司 | Galvanometer driving circuit, control method and projector |
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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: 20141029 Termination date: 20180625 |
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| CF01 | Termination of patent right due to non-payment of annual fee |