CN208337139U - Residual voltage control circuit and household appliance with same - Google Patents
Residual voltage control circuit and household appliance with same Download PDFInfo
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- CN208337139U CN208337139U CN201820904025.8U CN201820904025U CN208337139U CN 208337139 U CN208337139 U CN 208337139U CN 201820904025 U CN201820904025 U CN 201820904025U CN 208337139 U CN208337139 U CN 208337139U
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009781 safety test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000010048 yiguan Substances 0.000 description 1
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Abstract
The application provides a residual voltage's control circuit, including the Y electric capacity and the control chip of cross-over connection between live wire or zero line and ground wire, still be equipped with the electronic switch who establishes ties with this Y electric capacity, this electronic switch sets up to be in conducting state to this electronic switch receives this control chip's control, breaks off when the system falls the power failure. The application also provides a household appliance with the control circuit. This application control circuit can break off the return circuit through addding an electronic switch after the system falls the power failure, makes the residual voltage between the live wire or the zero line and the ground wire of connecting this Y electric capacity satisfy national standard GB 4706.1's requirement.
Description
Technical field
This application involves the control circuit of the residual voltage of household electrical appliance and with the household electrical appliance of the control circuit.
Background technique
Requirement of the national standard to household electrical appliance residual voltage at present is: it is powered with voltage rating, disconnects power supply in voltage peak,
When 1S upon opening, the voltage between each pin of plug is measured, 34V is not to be exceeded in this voltage.The one of existing household electrical appliance
As be in product shutdown transient, bleeder resistance automatically begins to discharge；Or detected by detection of power loss module and pulled out plug, then
It immediately connects load circuit the residual voltage of capacitor is released, to achieve the purpose that reduce the voltage between each pin.
The method accelerates current drain by conducting bleed-off circuit, can make L foot (firewire foot), the remnants between N foot (zero curve foot)
Voltage is quickly reduced to safety value or less.
But the above method for L foot over the ground and N foot is over the ground but without apparent improvement.By analysis and test
Card, cause L foot over the ground and N foot over the ground the higher reason of residual voltage be Y capacitance.On Household appliances product, EMC filter
Wave device is generally all connected to Y capacitance, and usually two, a foot jumps to L line (firewire) or N line (zero curve), a foot jump to ground wire.
After a loss of power, Y capacitance still can persistently discharge to L line or N line and earth loop, since the particularity and safety in its circuit are examined
Consider, discharge resistance cannot be increased between phase line and ground, and it is not also had obvious effects on by the way that load discharge circuit is connected.
In view of the above-mentioned problems, needing to provide a kind of control circuit of new residual voltage.
Utility model content
The application provides a kind of control circuit for residual voltage caused by Y capacitance and household electric with the circuit
Device.
Specifically, the application is achieved by the following technical solution: a kind of control circuit of residual voltage, including bridging
Y capacitance and control chip between firewire or zero curve and ground wire, are additionally provided with and the concatenated electronic switch of the Y capacitance, the electronics
Switch is arranged on state, and the electronic switch is controlled the control of chip by this, is disconnected when system is powered down.This Shen
Please control circuit by adding an electronic switch, can after a power failure, cut off connect the Y capacitance firewire or zero curve over the ground return
Road, since circuit has disconnected, the residual voltage for going measurement to connect between the firewire or zero curve and ground wire of the Y capacitance at this time is lower than
10V is much smaller than 34V, meets the requirement of national standard GB4706.1.
According to the application embodiment, which is photoelectrical coupler.
According to the application embodiment, which is relay.
According to the application embodiment, which is silicon-controlled.
According to the application embodiment, which terminates Y capacitance, other end ground connection.By electronic switch
It is arranged between Y capacitance and ground wire, circuit design can be fairly simple.
According to the application embodiment, which is set there are two Y capacitance, be connected across respectively firewire and ground wire it
Between and zero curve and ground wire between.
According to the application embodiment, one end of the electronic switch is connect with two Y capacitances simultaneously, another
End ground connection.Two Y capacitances only need to be arranged an electronic switch, can reduce circuit cost.
According to the application embodiment, including two electronic switches, one of them is connected on the Y for line of starting to exchange fire
Between capacitor and firewire, another, which is connected on, is connect between the Y capacitance of zero curve and zero curve.It is right respectively that multiple electronic switches can be set
Answer each Y capacitance.
The application also provides the following technical solutions: a kind of household electrical appliance, which has the control of aforementioned residual voltage
Circuit processed.After a power failure, the residual voltage connected between the firewire or zero curve and ground wire of the Y capacitance is low for the application household electrical appliance
In 10V, it is much smaller than 34V, meets the requirement of national standard GB4706.1.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
Fig. 1 shows the schematic diagram of the control method of the application residual voltage.
Fig. 2 shows another schematic diagrames of the control method of the application residual voltage.
Fig. 3 shows the first embodiment of the control circuit of the application residual voltage.
Fig. 4 shows the second embodiment of the control circuit of the application residual voltage.
Fig. 5 shows the third embodiment of the control circuit of the application residual voltage.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device of some aspects be described in detail in claims, the application, system, apparatus and method.
It is only to be not intended to be limiting the application merely for for the purpose of describing particular embodiments in term used in this application.
It is also intended in the application and the "an" of singular used in the attached claims, " described " and "the" including majority
Form, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein refers to and wraps
It may be combined containing one or more associated any or all of project listed.
It please refers to shown in Fig. 1, the EMC filter in household electrical appliance is generally all connected to Y capacitance, and one foot of Y capacitance jumps to fire
Line (calling L line in the following text) or zero curve (calling N line in the following text), a foot jumps to ground wire.In the prior art, after the household electrical appliance power down, Y electricity
Hold and persistently discharge L line or N line and ground wire, causes the residual voltage between L line or N line and ground wire higher, especially work as Y capacitance
When capacitance is bigger, voltage can be up to more than 100 herein, not meet the safety requirement of national standard.And the application is in the circuit of Y capacitance
In joined electronic switch, after the household electrical appliance power down, cut off the electronic switch, and then cut off the firewire for connecting the Y capacitance
Or the circuit of zero curve over the ground, it can reach the purpose for meeting safety testing requirements.
An electronic switching element as shown in Figure 1, the application has connected between Y capacitance and ground wire.When on the household electrical appliance
After electricity, system default makes the switch element be on closure, and one pin of Y capacitance normally accesses L line or N line, Ling Yiguan at this time
Foot normally accesses the earth, plays the role of common mode inhibition, carries out the work of normal EMC filtering.After system is powered down, fallen by one
Electro-detection module detects power down, concurrently give away electric signal to control chip, control chip receive power-off signal after, control institute
State electronic switching element disconnection, disconnect the connection between Y capacitance and ground wire, due to connect the Y capacitance L line or N line over the ground
Circuit has disconnected, and goes measurement to connect the residual voltage between the L line or N line and ground wire of the Y capacitance lower than 10V at this time, is much smaller than
34V can meet the requirement of national standard GB4706.1.
Fig. 2 shows another ways, in earlier figures 1, electronic switching element setting Y capacitance and ground wire it
Between, in the present embodiment, electronic switching element is arranged between Y capacitance and L line or N line.Equally, system default opens this
It closes element and is on closure, after system is powered down, power down is detected by detection of power loss module, control chip receives power down letter
After number, enables the electronic switching element disconnect, disconnect the connection between Y capacitance and L line or N line, since circuit has disconnected, this
When go measurement connect the Y capacitance L line or N line and ground wire between residual voltage can be much smaller than 34V.
Fig. 3 to Fig. 5 is the control circuit of the application residual voltage, and wherein Fig. 3 to Fig. 4 corresponds to control method shown in FIG. 1,
Fig. 5 corresponds to control method shown in Fig. 2.Bridging has capacitor C1 between L line and N line in Fig. 3, for filtering out series mode interference, R51,
It is in parallel with C1 after R52, R53 series connection, can after a power failure as discharge resistance, release current reduces the remnants electricity of L line and N line
Pressure.Variable resistance VR1 is also used in parallel with C1.In the present embodiment, use PC817 photoelectrical coupler as electronic switch, L line
Inductance L2, inductance L1, capacitor CY2 and photoelectrical coupler have been sequentially connected in series with earth loop.N line has been sequentially connected in series with earth loop
Another inductance L2, capacitor CY1 and the photoelectrical coupler.Capacitor CY1, CY2 are Y capacitance, are used to filtering common mode with inductance L2
Interference plays common mode inhibition, carries out EMC filtering operation.The photoelectrical coupler one end is connect with ground wire, the other end and capacitor
CY1 and CY2 connection.As it can be seen that two Y capacitances only need to be arranged a photoelectrical coupler in this embodiment, can reduce circuit at
This.
On the appliance after electricity, the optical coupled switch is in the conductive state, i.e., by VP pressure supply, makes LED lighting, so
Triode receives optical signal and is converted into electric signal afterwards, and L line and N line is connected to the circuit of ground wire, makes Y capacitance CY1 and CY2 just
Often work.And after system is powered down, power down is detected by detection of power loss module, power-off signal is sent and gives control chip, controls core
After piece receives power-off signal, photoelectrical coupler disconnection is controlled, cutting connects the N line of Y capacitance CY1 to earth loop, and
The L line of Y capacitance CY2 is connected to earth loop.It is gone between measurement L line and ground wire at this time and the residual voltage of N line and ground wire is equal
Lower than 10V, it is much smaller than 34V, meets the relevant regulations of national standard.
The circuit of first embodiment in the circuit connecting mode and figure 3 described above of second embodiment in Fig. 4 connects
It is essentially identical to connect mode, will only use relay substitution PC817 photoelectrical coupler as electronic switch, the relay one end
It is connect with ground wire, the other end is connect with capacitor CY1 and CY2, utilizes the on-off of the variation control switch of magnetic force caused by electric power.Together
After power-up, the relay is in the conductive state for sample, and L line and N line is connected to the circuit of ground wire, makes Y capacitance CY1 and CY2 just
Often work；And after system is powered down, relay disconnection is controlled, connects the N line of Y capacitance CY1 to earth loop, and connects Y
The L line of capacitor CY2 is disconnected to earth loop.It is gone between measurement L line and ground wire at this time and the remnants electricity of N line and ground wire
Pressure is below 10V, is much smaller than 34V, meets the relevant regulations of national standard.In other embodiments, silicon-controlled substitution can also be used
The relay.
3rd embodiment in Fig. 5 provides another circuit connecting mode, and electronic switch therein is with photoelectrical coupler
Example.Electronic switch is to connect between Y capacitance and ground wire in 2 embodiments of front, and is to have used two light in the present embodiment
Electric coupler, connects between CY2 capacitor and L line and CY1 capacitor and N line respectively, that is, connects between Y capacitance and L line or N line.
Working principle be also in fact it is identical, after powering on, two photoelectrical couplers are in the conductive state, are respectively turned on L line and N line to ground wire
Circuit, make Y capacitance CY1 and CY2 work normally；And after system is powered down, two photoelectrical couplers are in an off state, and are broken respectively
The N line of connection Y capacitance CY1 is opened to the circuit of ground wire, and connects the L line of Y capacitance CY2 to the circuit of ground wire.
The control circuit of the application residual voltage disconnects the electronics after system is powered down by the setting of electronic switch
Switch, the L line or N line that cutting connects the Y capacitance make to connect between the L line or N line and ground wire of Y capacitance to the circuit of ground wire
It measures voltage and is lower than 10V, be much smaller than 34V, comply fully with the relevant regulations of national standard.
The application also provides a kind of household electrical appliance, which has the control circuit of residual voltage above-mentioned.This Shen
Please household electrical appliance after a power failure, connect residual voltage between the firewire or zero curve and ground wire of the Y capacitance lower than 10V, it is remote small
In 34V, meet the requirement of national standard GB4706.1.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (9)
1. a kind of control circuit of residual voltage including the Y capacitance being connected across between firewire or zero curve and ground wire and controls chip,
It is arranged on state with the concatenated electronic switch of the Y capacitance, the electronic switch it is characterized by: being additionally provided with, and should
Electronic switch is controlled the control of chip by this, is disconnected when system is powered down.
2. the control circuit of residual voltage according to claim 1, it is characterised in that: the electronic switch is photoelectric coupling
Device.
3. the control circuit of residual voltage according to claim 1, it is characterised in that: the electronic switch is relay.
4. the control circuit of residual voltage according to claim 1, it is characterised in that: the electronic switch is silicon-controlled.
5. the control circuit of residual voltage according to claim 1, it is characterised in that: the electronic switch one terminates Y capacitance,
Other end ground connection.
6. the control circuit of residual voltage according to claim 1, it is characterised in that: the circuit is set there are two Y capacitance, point
It is not connected across between firewire and ground wire and between zero curve and ground wire.
7. the control circuit of residual voltage according to claim 6, it is characterised in that: one end of the electronic switch is simultaneously
It is connect with two Y capacitances, other end ground connection.
8. the control circuit of residual voltage according to claim 6, it is characterised in that: including two electronic switches,
In one be connected between the Y capacitance and firewire of line of starting to exchange fire, another, which is connected on, connects between the Y capacitance of zero curve and zero curve.
9. a kind of household electrical appliance, it is characterised in that: the electric household appliance is residual just like described in any one of claim 1 to 8
The control circuit of remaining voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820904025.8U CN208337139U (en) | 2018-06-12 | 2018-06-12 | Residual voltage control circuit and household appliance with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820904025.8U CN208337139U (en) | 2018-06-12 | 2018-06-12 | Residual voltage control circuit and household appliance with same |
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| Publication Number | Publication Date |
|---|---|
| CN208337139U true CN208337139U (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820904025.8U Active CN208337139U (en) | 2018-06-12 | 2018-06-12 | Residual voltage control circuit and household appliance with same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601132A (en) * | 2018-06-12 | 2019-12-20 | 浙江绍兴苏泊尔生活电器有限公司 | Residual voltage control method and circuit and household appliance using same |
-
2018
- 2018-06-12 CN CN201820904025.8U patent/CN208337139U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601132A (en) * | 2018-06-12 | 2019-12-20 | 浙江绍兴苏泊尔生活电器有限公司 | Residual voltage control method and circuit and household appliance using same |
| CN110601132B (en) * | 2018-06-12 | 2022-03-01 | 浙江绍兴苏泊尔生活电器有限公司 | Residual voltage control method and circuit and household appliance using same |
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