CN106961093B - Washing machine and short-circuit protection circuit used for same - Google Patents
Washing machine and short-circuit protection circuit used for same Download PDFInfo
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- CN106961093B CN106961093B CN201710174686.XA CN201710174686A CN106961093B CN 106961093 B CN106961093 B CN 106961093B CN 201710174686 A CN201710174686 A CN 201710174686A CN 106961093 B CN106961093 B CN 106961093B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The invention discloses a washing machine and a short-circuit protection circuit used for the same, wherein the short-circuit protection circuit comprises: one end of the first capacitor is connected to the power supply end of the silver ion generating device, and the other end of the first capacitor is connected to a low-voltage power supply; the first resistor is connected with the first capacitor in parallel; and the controllable switch cuts off the power supply of the low-voltage power supply to the silver ion generating device when the silver ion generating element in the silver ion generating device is short-circuited so as to perform short-circuit protection. According to the short-circuit protection circuit, the whole controller can be effectively prevented from losing power, so that the rest conventional functions of the washing machine can be ensured not to be influenced.
Description
Technical Field
The invention relates to the technical field of washing appliances, in particular to a short-circuit protection circuit for a washing machine and the washing machine.
Background
At present, the washing machine can provide +12V direct current low voltage for the silver ion generating device through a low-voltage power supply. When the silver ion generating device is connected with the low-voltage power supply, the direct current low voltage of +12V can be supplied to a silver ion generating element such as a silver sheet in the silver ion generating device, and the direct current low voltage of +12V is used as the electrolytic voltage of the silver ion generating element, so that the silver ion generating element placed in the washing water can generate silver ions to sterilize the washing water.
When the silver ion generating element is placed in water for a long time, due to different local water qualities and long-term charged consumption of the silver ion generating element, a short circuit phenomenon easily occurs at two ends of the silver ion generating element, so that a +12V direct-current low voltage and ground short circuit can be caused, the transformer current of the controller is rapidly increased, the switch chip of the switch power supply can send an instruction of turning off the switch power supply due to the rapid increase of the current so as to carry out short-circuit protection, and thus, the whole controller can be powered off, and all functions of the washing machine can stop working.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.
To this end, an object of the present invention is to provide a short-circuit protection circuit for a washing machine, which can effectively prevent the entire controller from being de-energized, thereby ensuring that the remaining conventional functions of the washing machine are not affected.
A second object of the present invention is to provide a washing machine.
In order to achieve the above object, according to a first aspect of the present invention, a short-circuit protection circuit for a washing machine is provided, the washing machine including a silver ion generating device, the short-circuit protection circuit being connected between a low-voltage power supply and the silver ion generating device, the short-circuit protection circuit including: one end of the first capacitor is connected to the power supply end of the silver ion generating device, and the other end of the first capacitor is connected to the low-voltage power supply; a first resistor connected in parallel with the first capacitor; and the controllable switch cuts off the power supply of the low-voltage power supply to the silver ion generating device when a silver ion generating element in the silver ion generating device is short-circuited so as to perform short-circuit protection.
According to the short-circuit protection circuit for the washing machine, the controllable switch cuts off the power supply of the low-voltage power supply to the silver ion generating device when the silver ion generating element in the silver ion generating device is short-circuited so as to perform short-circuit protection. The method can cut off the power supply of the silver ion generating device in time when the silver ion generating element is in short circuit, effectively prevent the whole controller from losing power, and further ensure that other conventional functions of the washing machine are not influenced.
In addition, the short-circuit protection circuit for a washing machine according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the silver ion generating device includes a power input terminal connected to the silver ion generating element, wherein the silver ion generating element generates silver ions to sterilize the washing water in the washing machine when the silver ion generating element is supplied with electrolytic power through the power input terminal.
According to an embodiment of the present invention, the controllable switch includes a coil, a first contact and a second contact, one end of the coil is connected to one end of the first capacitor, the other end of the coil is grounded, the first contact is connected to one end of the coil, and the second contact is connected to the low voltage power supply, wherein the low voltage power supply supplies power to the silver ion generating device by charging the first capacitor to provide a preset working voltage to the coil, the first contact and the second contact are communicated, and the low voltage power supply supplies power to the silver ion generating device to provide an electrolytic power to the silver ion generating element; and when the silver ion generating element is short-circuited to enable the voltage at two ends of the coil to be lower than the preset working voltage, the first contact and the second contact are disconnected to cut off the power supply of the low-voltage power supply to the silver ion generating device.
According to an embodiment of the present invention, the short-circuit protection circuit further includes: and the cathode of the first diode is connected with one end of the coil, and the anode of the first diode is grounded.
According to one embodiment of the invention, the controllable switch is a normally open relay.
According to one embodiment of the invention, the controllable switch is a transfer-type relay, wherein a moving contact of the transfer-type relay serves as the second contact, a normally open stationary contact of the transfer-type relay serves as the first contact, and a normally closed stationary contact of the transfer-type relay is floating.
According to an embodiment of the present invention, the silver ion generating device further includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein a collector of the first switching tube is connected to an emitter of the second switching tube, and a first node is located between the collector of the first switching tube and the emitter of the second switching tube; a collector of the third switching tube is connected with an emitter of the fourth switching tube, and a second node is arranged between the collector of the third switching tube and the emitter of the fourth switching tube; the emitting electrode of the first switching tube is connected with the emitting electrode of the third switching tube, and a third node is arranged between the emitting electrode of the first switching tube and the emitting electrode of the third switching tube; the collector electrode of the second switch tube is connected with the collector electrode of the fourth switch tube, a fourth node is arranged between the collector electrode of the second switch tube and the collector electrode of the fourth switch tube, wherein two ends of the silver ion generating element are respectively connected to the first node and the second node, the third node is used as a power input end of the silver ion generating element, and the fourth node is grounded through a second resistor.
According to an embodiment of the present invention, the silver ion generating apparatus further includes: a first input end of the first optical coupler is connected to a preset power supply, a second input end of the first optical coupler is connected to a first driving control signal input end through a third resistor, a first output end of the first optical coupler is connected with a base electrode of the first switch tube through a fourth resistor and is connected with a base electrode of the fourth switch tube through a fifth resistor, and a second output end of the first optical coupler is grounded; the third input end of the second optical coupler is connected to a preset power supply, the fourth input end of the second optical coupler is connected to the second driving control signal input end through a sixth resistor, the third output end of the second optical coupler is connected with the base of the second switch tube through a seventh resistor, the base of the third switch tube is connected through an eighth resistor, and the fourth output end of the second optical coupler is grounded.
According to an embodiment of the present invention, the silver ion generating device further includes a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor, wherein the ninth resistor is connected between the base and the emitter of the first switching tube, the tenth resistor is connected between the base and the emitter of the second switching tube, the eleventh resistor is connected between the base and the emitter of the third switching tube, and the twelfth resistor is connected between the base and the emitter of the fourth switching tube.
In order to achieve the above object, a second embodiment of the present invention provides a washing machine, including the above short-circuit protection circuit for a washing machine.
According to the washing machine provided by the embodiment of the invention, the short-circuit protection circuit for the washing machine is adopted, so that the power supply of the silver ion generating device can be cut off in time when the silver ion generating element is in short circuit, the power failure of the whole controller is effectively prevented, and the influence on other conventional functions of the washing machine can be avoided.
Drawings
Fig. 1 is a circuit diagram of a short-circuit protection circuit and a silver ion generating device for a washing machine according to an embodiment of the present invention; and
fig. 2 is a block schematic view of a washing machine according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A washing machine and a short-circuit protection circuit therefor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a short-circuit protection circuit and a silver ion generating device of a washing machine according to an embodiment of the present invention.
In the embodiment of the present invention, the short-circuit protection circuit 100 may be applied to a washing machine including the silver ion generating device 200, and the short-circuit protection circuit 100 is connected between the low voltage power supply VCC1 and the silver ion generating device 200.
First, a silver ion generating device 200 according to an embodiment of the present invention will be described with reference to fig. 1.
In one embodiment of the present invention, as shown in fig. 1, the silver ion generating device 200 may include a power input terminal connected to the silver ion generating element 210, wherein the silver ion generating element 210 generates silver ions to sterilize the washing water in the washing machine when the silver ion generating element 210 is supplied with electrolytic power through the power input terminal.
In an embodiment of the present invention, as shown in fig. 1, the silver ion generating device 200 may further include a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4. The collector of the first switch transistor Q1 is connected to the emitter of the second switch transistor Q2, and a first node J1 is located between the collector of the first switch transistor Q1 and the emitter of the second switch transistor Q2. The collector of the third switching tube Q3 is connected to the emitter of the fourth switching tube Q4, and a second node J2 is located between the collector of the third switching tube Q3 and the emitter of the fourth switching tube Q4. The emitter of the first switching tube Q1 is connected to the emitter of the third switching tube Q3, and a third node J3 is located between the emitter of the first switching tube Q1 and the emitter of the third switching tube Q3. The collector of the second switch transistor Q2 is connected to the collector of the fourth switch transistor Q4, and a fourth node J4 is provided between the collector of the second switch transistor Q2 and the collector of the fourth switch transistor Q4, wherein two ends of the silver ion generating element 210 are respectively connected to the first node J1 and the second node J2, the third node J3 is used as a power input terminal of the silver ion generating element 210, and the fourth node J4 is grounded to GND via a second resistor.
In an embodiment of the present invention, as shown in fig. 1, the silver ion generating device 200 may further include a first optical coupler OC1 and a second optical coupler OC 2. The first input end of the first optical coupler OC1 is connected to a preset power VCC2 (such as +5V), the second input end of the first optical coupler OC1 is connected to the first driving control signal input end AG + through a third resistor R3, the first output end of the first optical coupler OC1 is connected with the base of the first switch tube Q1 through a fourth resistor R4 and connected with the base of the fourth switch tube Q4 through a fifth resistor R5, and the second output end of the first optical coupler OC1 is grounded GND. A third input end of the second optical coupler OC2 is connected to a preset power supply VCC2 (such as +5V), a fourth input end of the second optical coupler OC2 is connected to a second driving control signal input end AG "through a sixth resistor R6, a third output end of the second optical coupler OC2 is connected with a base electrode of the second switching tube Q2 through a seventh resistor R7 and connected with a base electrode of the third switching tube Q3 through an eighth resistor R8, and a fourth output end of the second optical coupler OC2 is grounded GND. The first optical coupler OC1 may include a first light emitting diode LED1 and a first phototransistor VT1, and the second optical coupler OC2 may include a second light emitting diode LED2 and a second phototransistor VT 2.
In an embodiment of the present invention, as shown in fig. 1, the silver ion generating device 200 may further include a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12, wherein the ninth resistor R9 is connected between the base and the emitter of the first switching tube Q1, the tenth resistor R10 is connected between the base and the emitter of the second switching tube Q2, the eleventh resistor R11 is connected between the base and the emitter of the third switching tube Q3, and the twelfth resistor R12 is connected between the base and the emitter of the fourth switching tube Q4.
Specifically, when the controller (not specifically shown in the figure) outputs a timing control signal, the timing control signal is received through the first driving control signal input terminal AG + or the second driving control signal input terminal AG-of the silver ion generating device 200, so that a current flows through the first light emitting diode LED1 or the second light emitting diode LED2 to emit light, and after the corresponding first phototransistor VT1 or the corresponding second phototransistor VT2 is illuminated, a current is generated to turn on the first optocoupler OC1 or the second optocoupler OC 2. Therefore, the first switch tube Q1 and the fourth switch tube Q4 can be conducted, or the second switch tube Q2 and the third switch tube Q3 can be conducted. That is, the controller can alternately input the control signals to the first driving control signal input terminal AG + and the second driving control signal input terminal AG-, so that the first switching tube Q1 and the fourth switching tube Q4 are alternately conducted with the second switching tube Q2 and the third switching tube Q3, and further the positive and negative polarities of the electrolytic electrodes at the two ends of the silver ion generating element 210 can be continuously changed, thereby effectively avoiding the release of silver ions at one end of the silver ion generating element when the silver ion generating element is continuously used, and further prolonging the service life of the silver ion generating element.
In order to perform short-circuit protection on the silver ion generating device 200, the short-circuit protection circuit 100 according to the embodiment of the present invention is provided, and as shown in fig. 1, the short-circuit protection circuit 100 may be connected between the low-voltage power supply VCC1 and the silver ion generating device 200.
As shown in fig. 1, the short-circuit protection circuit 100 of the washing machine according to the embodiment of the present invention may include a first capacitor C1, a first resistor R1, and a controllable switch K.
One end of the first capacitor C1 is connected to the power supply terminal of the silver ion generating device 200, and the other end of the first capacitor C1 is connected to the low voltage power supply VCC 1. The first resistor R1 is connected in parallel with the first capacitor C1. The controllable switch K cuts off the power supply from the low voltage power supply VCC1 to the silver ion generating device 200 when the silver ion generating element 210 in the silver ion generating device 200 is short-circuited, so as to perform short-circuit protection.
When the silver ion generating element 210 of the silver ion generating device 200 is supplied with an electrolytic power source, such as +12V dc low voltage, through the low voltage power supply VCC1, the silver ion generating element 210 can normally operate, i.e., can generate silver ions to sterilize the washing water in the washing machine. When the silver ion generating element 210 is abnormal due to long-term use, the low-voltage power supply VCC1 can be cut off in time through controlling the controllable switch K to perform short-circuit protection, so that the whole controller can be prevented from losing power, and other conventional functions of the washing machine can be guaranteed from being influenced.
In one embodiment of the present invention, as shown in fig. 1, the controllable switch K may include a coil 4, a first contact 1 and a second contact 2, one end of the coil 4 is connected to one end of a first capacitor C1, the other end of the coil 4 is grounded GND, the first contact 1 is connected to one end of the coil 4, and the second contact 2 is connected to a low voltage power supply VCC 1. The low voltage power supply VCC1 provides a preset working voltage for the coil 4 by charging the first capacitor C1, the first contact 1 and the second contact 2 are connected, and the low voltage power supply VCC1 supplies power to the silver ion generating device 200 to provide an electrolytic power supply for the silver ion generating element 210. When the silver ion generating element 210 is short-circuited so that the voltage across the coil 4 is lower than the preset operating voltage, the first contact 1 and the second contact 2 are opened to cut off the power supply from the low voltage power supply VCC1 to the silver ion generating device 200.
In one embodiment of the invention, the controllable switch K may be a normally open relay or a transfer type relay.
In fig. 1, the controllable switch K is taken as an example of a transfer-type relay, a movable contact of the transfer-type relay is taken as a second contact 2, a normally open stationary contact of the transfer-type relay is taken as a first contact 1, and a normally closed stationary contact 3 of the transfer-type relay is suspended. That is, when the coil 4 of the transfer-type relay is not energized, the movable contact and the normally closed stationary contact 3 are in a connected state. When the coil 4 of the conversion type relay is electrified, the movable contact and the normally open fixed contact are in a connection state.
In one embodiment of the present invention, as shown in fig. 1, the short-circuit protection circuit 100 may further include a first diode D1. The cathode of the first diode D1 is connected to one end of the coil 4, and the anode of the first diode D1 is grounded to GND.
Specifically, when the low voltage power supply VCC1 is turned on, an instantaneous pulse may be generated to charge the first capacitor C1, and when the voltage across the first capacitor C1 increases to a preset operating voltage that is higher than the voltage across the coil 4, the coil 4 of the controllable switch K is energized, and the first contact 1 is connected to the second contact 2, so as to energize the silver ion generating device 200 and provide an electrolytic power supply for the silver ion generating element 210, so that the silver ion generating element 210 is electrolyzed and continuously releases silver ions, thereby sterilizing the washing water in the washing machine.
When the silver ion generating element 210 is short-circuited and the voltage across the first capacitor C1 is reduced to be lower than the preset operating voltage across the coil 4, the coil 4 is de-energized, and the first contact 1 and the second contact 2 are disconnected, so that the low-voltage power supply VCC1 at the power input end of the silver ion generating device 200 is cut off for short-circuit protection. When the coil 4 is in power-off state, the current generated by the coil 4 can be continued by utilizing the unidirectional conductive characteristic of the first diode D1, and other electronic devices can be effectively prevented from being damaged. Therefore, the power supply of the silver ion generating device can be cut off in time when the short circuit occurs to the silver ion generating element, the power failure of the whole controller is effectively prevented, and the influence on other conventional functions of the washing machine can be avoided.
It should be noted that, in the embodiment of the present invention, parameters of each component in fig. 1 may be set according to actual needs, for example, the capacity of the first capacitor C1 may be 470uF, the withstand voltage of the first capacitor C1 may be 50V, the resistance of the first resistor R1 may be 10K ohms, the resistance of the third resistor R3 may be 1K ohms, and the resistance of the sixth resistor may be 1K ohms.
In summary, according to the short-circuit protection circuit for a washing machine of the embodiment of the present invention, when a silver ion generating element in a silver ion generating device is short-circuited, a controllable switch cuts off power supplied to the silver ion generating device from a low-voltage power supply, so as to perform short-circuit protection. The method can cut off the power supply of the silver ion generating device in time when the silver ion generating element is in short circuit, effectively prevent the whole controller from losing power, and further ensure that other conventional functions of the washing machine are not influenced.
Based on the above embodiment, the present invention further provides a washing machine 1000.
Fig. 2 is a block schematic view of a washing machine according to an embodiment of the present invention. As shown in fig. 2, a washing machine 1000 according to an embodiment of the present invention may include the short-circuit protection circuit 100 of the washing machine.
It should be noted that, details not disclosed in the washing machine 1000 according to the embodiment of the present invention refer to details disclosed in the short-circuit protection circuit 100 of the washing machine according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the washing machine provided by the embodiment of the invention, the short-circuit protection circuit of the washing machine is adopted, so that the power supply of the silver ion generating device can be cut off in time when the silver ion generating element is in short circuit, the power loss of the whole controller is effectively prevented, and the influence on other conventional functions of the washing machine can be avoided.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A short-circuit protection circuit for a washing machine, the washing machine including a silver ion generating device, the short-circuit protection circuit being connected between a low-voltage power supply and the silver ion generating device, the short-circuit protection circuit comprising:
one end of the first capacitor is connected to the power supply end of the silver ion generating device, and the other end of the first capacitor is connected to the low-voltage power supply;
a first resistor connected in parallel with the first capacitor;
a controllable switch for cutting off the power supply of the low voltage power supply to the silver ion generating device when the silver ion generating element in the silver ion generating device is short-circuited, so as to perform short-circuit protection,
the controllable switch comprises a coil, a first contact and a second contact, one end of the coil is connected with one end of the first capacitor, the other end of the coil is grounded, the first contact is connected with one end of the coil, and the second contact is connected to the low-voltage power supply; when the silver ion generating element is short-circuited to enable the voltage across the coil to be lower than the preset working voltage, the first contact and the second contact are disconnected to cut off the power supply of the low-voltage power supply to the silver ion generating device, wherein the silver ion generating device comprises a power input end connected with the silver ion generating element, wherein when the silver ion generating element is supplied with electrolytic power through the power input end, the silver ion generating element generates silver ions to sterilize the washing water in the washing machine, wherein the silver ion generating device further comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein,
a collector of the first switching tube is connected with an emitter of the second switching tube, and a first node is arranged between the collector of the first switching tube and the emitter of the second switching tube;
a collector of the third switching tube is connected with an emitter of the fourth switching tube, and a second node is arranged between the collector of the third switching tube and the emitter of the fourth switching tube;
the emitting electrode of the first switching tube is connected with the emitting electrode of the third switching tube, and a third node is arranged between the emitting electrode of the first switching tube and the emitting electrode of the third switching tube;
the collector of the second switch tube is connected with the collector of the fourth switch tube, and a fourth node is arranged between the collector of the second switch tube and the collector of the fourth switch tube,
the two ends of the silver ion generating element are respectively connected to the first node and the second node, the third node is used as a power supply input end of the silver ion generating element, and the fourth node is grounded through a second resistor;
the silver ion generating device further includes:
a first input end of the first optical coupler is connected to a preset power supply, a second input end of the first optical coupler is connected to a first driving control signal input end through a third resistor, a first output end of the first optical coupler is connected with a base electrode of the first switch tube through a fourth resistor and is connected with a base electrode of the fourth switch tube through a fifth resistor, and a second output end of the first optical coupler is grounded;
a third input end of the second optical coupler is connected to a preset power supply, a fourth input end of the second optical coupler is connected to a second driving control signal input end through a sixth resistor, a third output end of the second optical coupler is connected with a base electrode of the second switching tube through a seventh resistor and is connected with a base electrode of the third switching tube through an eighth resistor, and a fourth output end of the second optical coupler is grounded;
the switch comprises a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, wherein the ninth resistor is connected between the base and the emitter of the first switch tube, the tenth resistor is connected between the base and the emitter of the second switch tube, the eleventh resistor is connected between the base and the emitter of the third switch tube, and the twelfth resistor is connected between the base and the emitter of the fourth switch tube.
2. The short-circuit protection circuit for a washing machine as claimed in claim 1, further comprising:
and the cathode of the first diode is connected with one end of the coil, and the anode of the first diode is grounded.
3. The short circuit protection circuit for a washing machine as claimed in claim 1, wherein the controllable switch is a normally open relay.
4. The short circuit protection circuit for a washing machine as claimed in claim 1, wherein the controllable switch is a transfer-type relay, wherein a moving contact of the transfer-type relay serves as the second contact, a normally open stationary contact of the transfer-type relay serves as the first contact, and a normally closed stationary contact of the transfer-type relay is floating.
5. A washing machine characterized by comprising the short-circuit protection circuit for a washing machine according to any one of claims 1 to 4.
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| CN201710174686.XA CN106961093B (en) | 2017-03-22 | 2017-03-22 | Washing machine and short-circuit protection circuit used for same |
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| CN201710174686.XA CN106961093B (en) | 2017-03-22 | 2017-03-22 | Washing machine and short-circuit protection circuit used for same |
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| CN106961093B true CN106961093B (en) | 2020-04-14 |
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| CN206894218U (en) * | 2017-03-22 | 2018-01-16 | 无锡飞翎电子有限公司 | Washing machine and the short-circuit protection circuit for it |
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| CN101103507A (en) * | 2005-09-06 | 2008-01-09 | 罗姆股份有限公司 | Overcurrent protective circuit, load driving unit, motor driving unit, electrical equipment, and power unit |
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| CN206894218U (en) * | 2017-03-22 | 2018-01-16 | 无锡飞翎电子有限公司 | Washing machine and the short-circuit protection circuit for it |
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| CN106961093A (en) | 2017-07-18 |
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