CN205046354U - Switch control circuit and washing machine for washing machine - Google Patents
Switch control circuit and washing machine for washing machine Download PDFInfo
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- CN205046354U CN205046354U CN201520736237.6U CN201520736237U CN205046354U CN 205046354 U CN205046354 U CN 205046354U CN 201520736237 U CN201520736237 U CN 201520736237U CN 205046354 U CN205046354 U CN 205046354U
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Abstract
The utility model discloses a switch control circuit for the washing machine, belong to the circuit field, the problem of current key switch factor of safety low is solved, the scheme mainly is that the input of major loop is connected with half -wave rectifier circuit, half -wave rectifier circuit, bleeder circuit and charging and discharging circuit establish ties in proper order, the key switch is established ties with the coil of first relay and is formed switch circuit, switch circuit connects the both ends at charging and discharging circuit, charging and discharging circuit's low -pressure end is connected with the output of major loop, the contact of first relay is connected between the input and output of major loop after connecting in parallel with the contact of second relay, the one side and the switch components and parts of the coil of second relay are established ties, the opposite side of the coil of second relay is connected with drive power supply VDD. The utility model discloses mainly used washing machine switch control. Additionally, the utility model discloses the washing machine who adopts above -mentioned switch control circuit is still provided.
Description
Technical field
The utility model relates to household electrical appliances, particularly a kind of use in washing machine power on-off control circuit and adopt the washing machine of this power on-off control circuit.
Background technology
In existing washing machine, for the consideration of safety and efficiency aspect, when washing machine does not run, most of circuit of washing machine is all in off-position, when needs run washing machine, adopt key switch to coordinate interlock circuit to carry out energising to the power supply of washing machine and control.Power on-off control circuit such as shown in Fig. 1, to be switched on power ON-OFF control circuit by key switch SW1, driving power VDD is made to provide voltage to relay R L1, make the coil adhesive contact of relay R L1, although ensure that the off-position of washing machine major part circuit when standby and lower stand-by power consumption, but in power supply energising moment, because high-tension loading and the instantaneous of big current pass through, have higher requirement to the own electrical characteristic of key switch SW1 and current-limiting resistance R1, the cost of whole scheme is general all higher.In addition, what key switch SW1 two ends were accessed is civil power high pressure, and can produce personal injury to user when there is drain conditions, safety coefficient is lower.
Summary of the invention
The object that the utility model will reach just is to provide a kind of use in washing machine power on-off control circuit, the high voltage of existing washing machine, the power on-off control circuit of big current are designed to the power on-off control circuit of low-voltage, low current, reduce the electrical characteristic requirement to key switch, reduce production cost, make the voltage at key switch two ends exceed human safety voltage, improve safety in utilization.
In order to achieve the above object, the utility model adopts following technical scheme: a kind of use in washing machine power on-off control circuit, comprise major loop, rectification circuit, bleeder circuit, charge-discharge circuit, key switch, first relay and the second relay, the input of major loop is connected with rectification circuit, rectification circuit, bleeder circuit and charge-discharge circuit are connected between the input of major loop and output successively, the coils connected in series of key switch and the first relay forms on-off circuit, on-off circuit is connected to the two ends of charge-discharge circuit, the contact of the first relay is connected between the input of major loop and output with after the contact shunt of the second relay, connect with switching component in the side of the coil of the second relay, the opposite side of the coil of the second relay is connected with driving power VDD, driving power VDD output voltage is made after the contact of the first relay and/or the contact adhesive of the second relay.
As preferred scheme, described charge-discharge circuit comprises diode D3, electric capacity C2 and resistance R5, the negative pole of electric capacity C2 is connected with the output of major loop, the positive pole of electric capacity C2 is connected with the negative pole of diode D3, the positive pole of diode D3 is connected with bleeder circuit, the coil of the first relay is connected in parallel on the two ends of electric capacity C2 after connecting with key switch, one end of resistance R5 is connected with bleeder circuit, and the other end of resistance R5 is connected with the output of major loop.Because major loop uses AC power, therefore after rectification circuit filters, the voltage on bleeder circuit is half-wave voltage, when the voltage of the voltage on R5 higher than electric capacity C2, utilize the forward voltage of divider resistance R5 to C2 poor, voltage, by diode D3, carries out afterflow charging to electric capacity C2; When the voltage of the voltage on R5 lower than electric capacity C2, diode D3 oppositely ends, and prevents C2 oppositely to R5 electric discharge, thus makes electric capacity C2 keep high voltage.The smoothing effect of direct current that electric capacity C2 is larger to fluctuation, its energy storage effect simultaneously can meet the restriction of the current limliting of bleeder circuit and the instantaneous large-current demand of follow-up load.
Preferred scheme further, the two ends of described electric capacity C2 are also parallel with voltage-stabiliser tube ZD1, and the positive pole of voltage-stabiliser tube ZD1 is connected with the negative pole of electric capacity C2, and the negative pole of voltage-stabiliser tube ZD1 is connected with the positive pole of electric capacity C2.Voltage-stabiliser tube ZD1 mainly makes further pressure stabilization function to the voltage exported after C2, limits the voltage in follow-up loop, prevent C2 from exporting components and parts that too high voltage can damage subsequent conditioning circuit.Except voltage-stabiliser tube ZD1, also three terminal regulator can be adopted.
Further preferred scheme, the coil of described first relay connect with key switch after two ends be parallel with resistance R6.Resistance R6 provides the path of releasing of a burr interfering signal, the burr signal produced is released fast during switch key action, improves the interference free performance of circuit.
As preferred scheme, described rectification circuit is half-wave rectifying circuit, and half-wave rectifying circuit comprises diode D1 and diode D2, and the positive pole of diode D1 is connected with the input of major loop, the negative pole of diode D1 is connected with the positive pole of diode D2, and the negative pole of diode D2 is connected with bleeder circuit.Double diode realizes reliable halfwave rectifier effect, uses the mode of two Diode series, and to reach high voltage withstanding object, circuit is simple, can reduce costs.
As preferred scheme, described bleeder circuit comprises resistance R1, resistance R2, resistance R3 and resistance R4, and resistance R1 and resistance R2 is in parallel, and resistance R3 and resistance R4 is in parallel, connects after resistance R1 and resistance R2 parallel connection with the resistance R3 after parallel connection and resistance R4.Resistance R1, R2, R3 and R4 resistance can not be excessive, otherwise the electric current flowing through bleeder circuit is too little, effectively cannot charge to follow-up electric capacity C2, charging interval can be very long, affect the continued operation of key switch, adopt lower powered fixed carbon resister parallel combination, effectively reduce circuit cost.Bleeder circuit also can adopt single high-power resistance.
As preferred scheme, described switching component is triode Q1, and the emitter stage of triode Q1 is connected with the side of the coil of the second relay, the grounded collector of triode Q1, and the base stage of triode Q1 is connected with control unit IC.Triode controls convenient, and cost is lower, only needs the signal of telecommunication of base stage, and except triode, other common switching component is also fine, such as photoelectrical coupler, controllable silicon, metal-oxide-semiconductor etc.
After adopting technique scheme, the utility model tool has the following advantages: after carrying out rectification process by rectification circuit to alternating current, again through bleeder circuit step-down, charge-discharge circuit is used to obtain the lower direct current of a voltage value, utilize the on-off circuit that the coils connected in series of this direct current cooperation key switch and the first relay is formed, the contact adhesive of the first relay is controlled by direct current, alternating current is circulated on major loop, the circuit that the output of major loop is connected below is powered, owing to being input to DC voltage on key switch through step-down process, therefore controlled hypotension amplitude can make to be input to DC voltage on key switch lower than 36V, namely lower than human safety voltage, equally also can control the DC current flowing through key switch after key switch conducting, therefore, it is possible to raising safety in utilization, the situation that also there will not be user to get an electric shock even if key switch leaks electricity, equally because the DC voltage and DC current being input to key switch can control less, greatly can reduce the electric requirement of key switch, use the lower components and parts of some prices just can reach the control effects identical with the power on-off control circuit in existing washing machine, effectively reduce cost, and during laundry apparatus standby, the power consumption of power on-off control circuit is lower, economize energy.
In addition, the utility model also provides a kind of washing machine, comprises control block, control block is provided with guidance panel, guidance panel is provided with key switch, is provided with power circuit plate in control block, and power circuit plate is provided with the use in washing machine power on-off control circuit in above-mentioned arbitrary technical scheme.
The DC voltage value used due to the key switch in the use in washing machine power on-off control circuit in the utility model can control lower, therefore the safety coefficient of the working environment of power on-off control circuit is high, and the components and parts cost adopted in whole power on-off control circuit is low, the production cost of washing machine can be reduced, in addition from control angle, due to the key switch only just conducting when user presses, can automatically disconnect after user's pressing, therefore when washing machine closed by needs, as long as make the contact tripping of the second relay, and This move will be realized, as long as switching component disconnects the coil blackout making the second relay, control very convenient.Common key switch can be directly installed on guidance panel, makes the moulding of washing machine compacter, and structure is more succinct, is convenient to install simultaneously, can effectively reduces product fraction defective.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Fig. 1 is the schematic diagram of existing a kind of power on-off control circuit;
Fig. 2 is the schematic diagram of a kind of power on-off control circuit in the utility model;
Detailed description of the invention
Embodiment one:
First, the utility model provides a kind of use in washing machine power on-off control circuit, comprise major loop, rectification circuit, bleeder circuit, charge-discharge circuit, key switch, first relay and the second relay, the input of major loop is connected with rectification circuit, rectification circuit, bleeder circuit and charge-discharge circuit are connected between the input of major loop and output successively, namely after the input of major loop connects rectification circuit, bleeder circuit is connected by rectification circuit, then charge-discharge circuit is connected by bleeder circuit, the output of major loop is finally connected by charge-discharge circuit, the coils connected in series of key switch and the first relay forms on-off circuit, on-off circuit is connected to the two ends of charge-discharge circuit, the contact of the first relay is connected between the input of major loop and output with after the contact shunt of the second relay, connect with switching component in the side of the coil of the second relay, the opposite side of the coil of the second relay is connected with driving power VDD, driving power VDD output voltage is made after the contact of the first relay and/or the contact adhesive of the second relay.Make after the contact of the first relay and/or the contact adhesive of the second relay driving power VDD output voltage to refer in the contact of the first relay and the contact of the second relay any one adhesive or both adhesive when, all can make driving power VDD output voltage.
See below in conjunction with Fig. 2.
Same as the prior art, be anti-interference element at the input LN of major loop with VA1 and C1 be connected between output NE, the interfering signal be used in filtering electrical network.
Rx is washing machine internal load, in the contact of the first relay and the contact of the second relay any one adhesive or both adhesive when, Rx connects AC power, stable driving power VDD can be produced, driving power VDD can make again the contact adhesive of the second relay conversely, therefore can produce driving power VDD sustainedly and stably, ensure washing machine normal operation.
In the present embodiment, rectification circuit is half-wave rectifying circuit, comprises diode D1 and diode D2, and the positive pole of diode D1 is connected with the input LN of major loop, the negative pole of diode D1 is connected with the positive pole of diode D2, and the negative pole of diode D2 is connected with bleeder circuit.Two diodes are adopted to be that the cost comparing the diode of employing more than one or three is low in order to consider the requirement of withstand voltage reducing diode.Certain employing full-wave rectifying circuit or rectifier bridge are also feasible.
Bleeder circuit comprises resistance R1, resistance R2, resistance R3 and resistance R4, and resistance R1 and resistance R2 is in parallel, and resistance R3 and resistance R4 is in parallel, connects after resistance R1 and resistance R2 parallel connection with the resistance R3 after parallel connection and resistance R4.Certainly single or two resistance can be adopted to carry out dividing potential drop, but can improve the power requirement of resistance itself, during work, resistance can significantly generate heat, certain impact can be produced to peripheral devices, the cost of high-power resistor also can be higher simultaneously, and adopt too much resistance combination, because the resistance tolerance of resistance exists, the error of whole circuit can be caused to become large.
Charge-discharge circuit comprises diode D3, electric capacity C2 and resistance R5, the negative pole of electric capacity C2 is connected with the output NE of major loop, the positive pole of electric capacity C2 is connected with the negative pole of diode D3, the positive pole of diode D3 is connected with bleeder circuit, the coil of the first relay R L1 is connected in parallel on the two ends of electric capacity C2 after connecting with key switch, one end of resistance R5 is connected with bleeder circuit, and the other end of resistance R5 is connected with the output NE of major loop.
In order to protect electric capacity C2, the two ends of electric capacity C2 are also parallel with voltage-stabiliser tube ZD1, and the positive pole of voltage-stabiliser tube ZD1 is connected with the negative pole of electric capacity C2, and the negative pole of voltage-stabiliser tube ZD1 is connected with the positive pole of electric capacity C2.In addition, the coil of the first relay R L1 connect with key switch SW1 after two ends be parallel with resistance R6, by fast the release absorption of resistance R6 to the burr signal produced during key switch SW1 action, guarantee the overall interference free performance of circuit.
In the present embodiment, switching component is triode Q1, and the emitter stage of triode Q1 is connected with the side of the coil of the second relay R L2, the grounded collector of triode Q1, and the base stage of triode Q1 is connected with control unit IC.
Below operation principle is described in detail.
Washing machine is after the plug that plugs in, and because the output NE in major loop is disconnected by the contact of the contact of the first relay R L1 and the second relay R L2, alternating current is rectified into direct current by D1 and D2.This direct current is by R1, R2, R3, R4 and R5 dividing potential drop, and the size of the voltage value at R5 two ends can realize adjustment by the resistance value adjusting R1, R2, R3, R4 and R5.Because alternating current is by after D1 and D2 rectification, the electric current flowing through R1, R2, R3, R4 and R5 is sinusoidal positive half-wave, directly cannot apply to the coil adhesive contact making the first relay, so adopt electric capacity C2 to carry out voltage smoothing processing.
Voltage on R5 is charged to C2 by the diode D3 of one-way conduction, voltage on C2 is risen by initial 0V gradually until remain unchanged, when the voltage on C2 to be reduced to due to subsequent conditioning circuit and the loss of self lower than voltage on R5, voltage on R5 will charge to C2, and the voltage that R5 assigns to, size variation can be there is along with the curvilinear motion of alternating current, when the voltage of the voltage on R5 lower than C2, due to the one-way conduction characteristic of D3, C2 can not discharge to R5.
When SW1 is not pressed conducting, the kwh loss on C2 will be very little.And alternating current carries out charging to C2 and supplements after R1, R2, R3 and R4 dividing potential drop, because the size of the voltage value at R5 two ends can realize adjustment by adjusting the resistance value of R1, R2, R3, R4 and R5, therefore can control to make the voltage on C2 keep stable.
After SW1 is pressed conducting, the coil conducting of RL1, the voltage of electric capacity C2 is by after voltage-stabiliser tube ZD1 voltage stabilizing, flow through the coil of RL1, RL1 adhesive, thus make output NE and the input LN conducting of major loop, the output NE circuit below that washing machine is connected to major loop is energized, and driving power VDD be by the output NE of major loop after circuit produce, now IC output low level signal makes triode Q1 conducting, driving voltage VDD will through the contact adhesive of the coil of RL2 by RL2, and now the power supply of washing machine keeps conducting.After user decontrols SW1, the contact of RL2 still keeps adhesive, so washing machine obtains continued power.When washing machine needs shutdown, as long as IC exports high level cut off triode Q1, the contact of RL2 will tripping, and major loop becomes open circuit, and washing machine shuts down.
When selecting resistance R1, R2, R3 and R4, adopt larger resistance and the resistance of smaller power, will be less to the charging current of C2, when driving the coil of RL1, electric current is almost all provided by the electricity be stored in C2, voltage now on C2 can decline gradually, until the pick-up voltage of contact lower than RL1, C2 is started discharge and make the contact of RL1 by adhesive to RL1 until the contact of RL1 cannot the timing definition of the tripping by adhesive be effective driving time T, so in T, must allow the contact adhesive of RL2, washing machine just can realize continued power.According to the real reaction speed of the circuit after the output NE being connected to major loop, the corresponding capacitance of adjustment electric capacity C2 and the resistance value of R1, R2, R3, R4 and R5 can reasonably design the time span of T.Resistance value along with R1, R2, R3, R4 and R5 becomes large, will reduction gradually to the charging current of C2 electric capacity, if but keep the resistance ratio of R1, R2, R3, R4 and R5 constant, just can ensure the electricity maintenance saturation state of the voltage stabilization of C2 during laundry apparatus standby, storage.
Embodiment two:
In addition, the utility model additionally provides a kind of washing machine, comprises control block, control block is provided with guidance panel, guidance panel is provided with key switch, is provided with power circuit plate in control block, and power circuit plate is provided with the use in washing machine power on-off control circuit disclosed in above-described embodiment.
Except above preferred embodiment, the utility model also has other embodiment, those skilled in the art can make various change and distortion according to the utility model, only otherwise depart from spirit of the present utility model, all should belong to the scope defined in the utility model claims.
Claims (8)
1. a use in washing machine power on-off control circuit, it is characterized in that: comprise major loop, rectification circuit, bleeder circuit, charge-discharge circuit, key switch, first relay and the second relay, the input of described major loop is connected with rectification circuit, described rectification circuit, bleeder circuit and charge-discharge circuit are connected between the input of major loop and output successively, the coils connected in series of described key switch and the first relay forms on-off circuit, described on-off circuit is connected to the two ends of charge-discharge circuit, the contact of described first relay is connected between the input of major loop and output with after the contact shunt of the second relay, connect with switching component in the side of the coil of described second relay, the opposite side of the coil of described second relay is connected with driving power VDD, driving power VDD output voltage is made after the contact of described first relay and/or the contact adhesive of the second relay.
2. use in washing machine power on-off control circuit according to claim 1, it is characterized in that: described charge-discharge circuit comprises diode D3, electric capacity C2 and resistance R5, the described negative pole of electric capacity C2 is connected with the output of major loop, the positive pole of described electric capacity C2 is connected with the negative pole of diode D3, the positive pole of described diode D3 is connected with bleeder circuit, the coil of described first relay is connected in parallel on the two ends of electric capacity C2 after connecting with key switch, one end of described resistance R5 is connected with bleeder circuit, and the described other end of resistance R5 is connected with the output of major loop.
3. use in washing machine power on-off control circuit according to claim 2, it is characterized in that: the two ends of described electric capacity C2 are also parallel with voltage-stabiliser tube ZD1, the positive pole of described voltage-stabiliser tube ZD1 is connected with the negative pole of electric capacity C2, and the negative pole of described voltage-stabiliser tube ZD1 is connected with the positive pole of electric capacity C2.
4. use in washing machine power on-off control circuit according to claim 2, is characterized in that: the coil of described first relay connect with key switch after two ends be parallel with resistance R6.
5. use in washing machine power on-off control circuit according to claim 1 and 2, it is characterized in that: described rectification circuit is half-wave rectifying circuit, described half-wave rectifying circuit comprises diode D1 and diode D2, the described positive pole of diode D1 is connected with the input of major loop, the negative pole of described diode D1 is connected with the positive pole of diode D2, and the negative pole of described diode D2 is connected with bleeder circuit.
6. use in washing machine power on-off control circuit according to claim 1 and 2, it is characterized in that: described bleeder circuit comprises resistance R1, resistance R2, resistance R3 and resistance R4, described resistance R1 and resistance R2 is in parallel, described resistance R3 and resistance R4 is in parallel, connects after described resistance R1 and resistance R2 parallel connection with the resistance R3 after parallel connection and resistance R4.
7. use in washing machine power on-off control circuit according to claim 1 and 2, it is characterized in that: described switching component is triode Q1, the emitter stage of described triode Q1 is connected with the side of the coil of the second relay, the grounded collector of described triode Q1, the base stage of described triode Q1 is connected with control unit IC.
8. a washing machine, comprise control block, described control block is provided with guidance panel, described guidance panel is provided with key switch, be provided with power circuit plate in described control block, it is characterized in that: described power circuit plate is provided with the arbitrary described use in washing machine power on-off control circuit of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520736237.6U CN205046354U (en) | 2015-09-22 | 2015-09-22 | Switch control circuit and washing machine for washing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520736237.6U CN205046354U (en) | 2015-09-22 | 2015-09-22 | Switch control circuit and washing machine for washing machine |
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| Publication Number | Publication Date |
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| CN205046354U true CN205046354U (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520736237.6U Active CN205046354U (en) | 2015-09-22 | 2015-09-22 | Switch control circuit and washing machine for washing machine |
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| CN (1) | CN205046354U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812970A (en) * | 2017-03-20 | 2017-06-09 | 长沙理工大学 | A kind of open-shut control system of Drain Valve of Washing Machine |
-
2015
- 2015-09-22 CN CN201520736237.6U patent/CN205046354U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812970A (en) * | 2017-03-20 | 2017-06-09 | 长沙理工大学 | A kind of open-shut control system of Drain Valve of Washing Machine |
| CN106812970B (en) * | 2017-03-20 | 2018-08-31 | 长沙理工大学 | A kind of open-shut control system of Drain Valve of Washing Machine |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210208 Address after: 310018 No.2, Songqiao street, Hangzhou Economic and Technological Development Zone, Hangzhou City, Zhejiang Province Patentee after: PANASONIC HOME APPLIANCES (CHINA) Co.,Ltd. Patentee after: Hangzhou Matsushita Household Appliances Co.,Ltd. Address before: 310018 3-A, No. 6 Songqiao Street, Hangzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: PANASONIC HOME APPLIANCES R&D CENTER (HANGZHOU) Co.,Ltd. Patentee before: Hangzhou Matsushita Household Appliances Co.,Ltd. |
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| TR01 | Transfer of patent right |