CN206595714U - Home appliance and the surge protection circuit for home appliance - Google Patents
Home appliance and the surge protection circuit for home appliance Download PDFInfo
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- CN206595714U CN206595714U CN201720340428.XU CN201720340428U CN206595714U CN 206595714 U CN206595714 U CN 206595714U CN 201720340428 U CN201720340428 U CN 201720340428U CN 206595714 U CN206595714 U CN 206595714U
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Abstract
A kind of surge protection circuit the utility model discloses home appliance and for home appliance, the surge protection circuit includes：Zero passage detection unit, it is interval to obtain the zero passage of electric main by carrying out zero passage detection to Rectified alternating current；Two-way surge detection unit, including the first to the 3rd detection branch, respectively to detect the positive surge trigger voltage, current surge voltage and negative sense surge trigger voltage of electric main；Control unit; trigger surge protection when the current surge voltage of zero passage interval judgement of electric main is more than predetermined reference voltage, and electric main be not in zero passage it is interval when according between current surge voltage and positive surge trigger voltage, the relation of negative sense surge trigger voltage judges whether to trigger surge protection.The circuit uses two-way surge protection by using unidirectional surge protection in zero passage interval, and in non-zero passage interval, so as to can both realize bidirectional protective, improves protection sensitivity, and surge during zero passage can be avoided to protect by mistake again.
Description
Technical field
The utility model is related to household electrical appliance technical field, more particularly to a kind of surge protection circuit for home appliance
With a kind of home appliance.
Background technology
As the improvement of people's living standards, electronic product is more and more, there is the probability of surge in whole electricity network
Increasing, being struck by lightning in addition also most likely results in whole electricity network and surging signal occurs, so as to be produced to electricity consumption product dry
Disturb or even cause to damage.
In order to effectively suppress the interference of surging signal, typically surge protection circuit can be set in electricity consumption product.But mesh
Also there is certain defect in preceding surge protection circuit, so needing to be improved surge protection circuit.
Utility model content
The application is that the understanding of problems with and research are made based on utility model people：
In correlation technique, by setting unidirectional surge protection circuit in home appliance to suppress the interference of surging signal,
However, unidirectional surge protection circuit can only realize positive surge protection, and sensitivity is relatively low.And in order to realize that negative sense surge is protected
Shield, can set two-way surge protection circuit in home appliance, i.e., detect positive surge and negative sense by three surge detection mouths
Surge, to carry out two-way surge protection.But, two-way surge protection circuit can be produced at the zero crossing of electric main to be protected by mistake
Shield, causes home appliance not use normally.
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.Therefore, this reality
It is to propose a kind of surge protection circuit for home appliance with a new purpose, the circuit in zero passage interval by adopting
Unidirectional surge protection is used, and two-way surge protection is used in non-zero passage interval, so as to can both realize bidirectional protective, protection is improved
Sensitivity, can avoid surge during zero passage from protecting by mistake again.
Another purpose of the present utility model is to propose a kind of home appliance.
To reach above-mentioned purpose, on the one hand the utility model proposes a kind of surge protection circuit for home appliance,
The power supply circuit of the home appliance includes rectification unit, and the rectification unit by the electric main of input to be converted to pulsation
Direct current, the surge protection circuit includes：Zero passage detection unit, the output of the zero passage detection unit and the rectification unit
End is connected, and the zero passage detection unit to Rectified alternating current progress zero passage detection by obtaining the mistake of the electric main
Zero is interval；Two-way surge detection unit, the two-way surge detection unit is connected with the output end of the rectification unit, described double
Include the first detection branch, the second detection branch and the 3rd detection branch to surge detection unit, first detection branch is led to
Cross and carry out surge detection to the Rectified alternating current to obtain the positive surge trigger voltage of the electric main, second inspection
Branch road is surveyed by carrying out the Rectified alternating current surge detection to obtain the current surge voltage of the electric main, described the
Three detection branch trigger electricity by the negative sense surge for carrying out surge detection to the Rectified alternating current to obtain the electric main
Pressure, wherein, the positive surge trigger voltage is more than the negative sense surge trigger voltage；Control unit, described control unit point
It is not connected with the zero passage detection unit, first detection branch, the second detection branch and the 3rd detection branch, the control
Triggering surge is protected when current surge voltage described in zero passage interval judgement of the unit in the electric main is more than predetermined reference voltage
Shield, and when the electric main is not in zero passage interval according to the current surge voltage and the positive surge trigger voltage
Between relation and the current surge voltage and the negative sense surge trigger voltage between relation judge whether triggering wave
Gush protection；DC power supply unit, the DC power supply unit is connected with described control unit, and the DC power supply unit is used to give
Described control unit is powered.
According to the surge protection circuit of the present utility model for home appliance, by zero passage detection unit to pulsating direct current
It is interval to obtain the zero passage of electric main that electricity carries out zero passage detection, and the first to the 3rd detection for passing through two-way surge detection unit
Branch road detects the positive surge trigger voltage, current surge voltage and negative sense surge trigger voltage of electric main respectively.Control is single
Member triggers surge protection when the current surge voltage of zero passage interval judgement of electric main is more than predetermined reference voltage, and in exchange
Civil power be not in zero passage it is interval when according to the relation and current surge between current surge voltage and positive surge trigger voltage
Relation between voltage and negative sense surge trigger voltage judges whether to trigger surge protection.Thus, the circuit passes through in zero passage area
Between use unidirectional surge protection, and use two-way surge protection in non-zero passage interval, so as to can both realize bidirectional protective, improve
Protection sensitivity, can avoid surge during zero passage from protecting by mistake again.
In addition, the surge protection circuit for home appliance proposed according to the utility model above-described embodiment can also have
There is technical characteristic additional as follows：
Specifically, when the electric main is not in zero passage interval, wherein, if the current surge voltage is more than institute
State positive surge trigger voltage, described control unit triggering surge protection；If the current surge voltage is less than the negative sense
Surge trigger voltage, described control unit triggering surge protection.
Specifically, the zero passage detection unit includes：First resistor, one end of the first resistor pass through series connection first
Current-limiting resistance and the second current-limiting resistance are connected with the positive output end of the rectification unit；Second resistance, the one of the second resistance
End is connected with the other end of the first resistor and with first node, and the other end of the second resistance is grounded, and described first
Node is connected with the zero passage detection end of described control unit；First electric capacity, first electric capacity is in parallel with the second resistance.
Specifically, first detection branch includes：3rd resistor, one end of the 3rd resistor passes through the 3rd current limliting electricity
Resistance is connected with the positive output end of the rectification unit；4th resistance, one end of the 4th resistance is another with the 3rd resistor
One end is connected and with Section Point, and the other end of the 4th resistance is grounded, the Section Point and described control unit
First surge test side is connected；Second electric capacity, second electric capacity and the 4th resistor coupled in parallel.
Specifically, second detection branch includes：5th resistance, one end and the 3rd resistor of the 5th resistance
One end be connected；6th resistance, one end of the 6th resistance is connected with the other end of the 5th resistance and with Section three
Point, the other end ground connection of the 6th resistance, the 3rd node is connected with the second surge test side of described control unit；The
Three electric capacity, the 3rd electric capacity and the 6th resistor coupled in parallel.
Specifically, the 3rd detection branch includes：7th resistance, one end of the 7th resistance is respectively with the described 3rd
One end of resistance is connected with one end of the 5th resistance；8th resistance, one end and the 7th resistance of the 8th resistance
The other end be connected and with fourth node, the other end of the 8th resistance is grounded, and the fourth node and the control are single
3rd surge test side of member is connected；4th electric capacity, the 4th electric capacity and the 8th resistor coupled in parallel.
Further, the capacitance of second electric capacity is equal with the capacitance of the 4th electric capacity, and more than the described 3rd electricity
The capacitance of appearance.
Specifically, the zero passage interval time is less than 2.5ms.
To reach above-mentioned purpose, the utility model another aspect embodiment proposes a kind of home appliance, and it includes above-mentioned
The surge protection circuit for home appliance.
According to home appliance of the present utility model, by the above-mentioned surge protection circuit for home appliance, in zero passage
Interval uses unidirectional surge protection, and uses two-way surge protection in non-zero passage interval, so as to can both realize bidirectional protective, carries
High protection sensitivity, can avoid surge during zero passage from protecting by mistake again.
Brief description of the drawings
Fig. 1 is illustrated according to the square frame of the surge protection circuit for home appliance of the utility model one embodiment
Figure；
Fig. 2 is the circuit diagram of the surge protection circuit for home appliance according to the utility model one embodiment；
Fig. 3 is according to the waveform that each test side the is detected when normal signal of the electric main of one embodiment of the present utility model
Figure；
Fig. 4 is the flow chart of the surge protection method according to the home appliance of the utility model one embodiment；And
Fig. 5 is the flow chart of the surge protection method of the home appliance according to one specific example of the utility model.
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
Set below in conjunction with the accompanying drawings to describe surge protection circuit, the household electrical appliances for home appliance of the utility model embodiment
The surge protection method of standby and home appliance.
Fig. 1 is illustrated according to the square frame of the surge protection circuit for home appliance of the utility model one embodiment
Figure.As shown in figure 1, the power supply circuit of home appliance includes rectification unit 10, rectification unit 10 is to by the electric main of input
Be converted to Rectified alternating current.Surge protection circuit includes：Zero passage detection unit 20, two-way surge detection unit 30, control unit
40 and DC power supply unit 50.
Wherein, zero passage detection unit 20 is connected with the output end of rectification unit 10, and zero passage detection unit 20 passes through to pulsation
It is interval to obtain the zero passage of electric main that direct current carries out zero passage detection.Two-way surge detection unit 30 is defeated with rectification unit 10
Go out end to be connected, two-way surge detection unit 30 includes the first detection branch 301, the second detection branch 302 and the 3rd detection branch
303, the first detection branch 301 triggers electricity by the positive surge for carrying out surge detection to Rectified alternating current to obtain electric main
Uh is pressed, the second detection branch 302 is detected to obtain the current surge voltage of electric main by carrying out surge to Rectified alternating current
Uac, the 3rd detection branch 303 triggers electricity by the negative sense surge for carrying out surge detection to Rectified alternating current to obtain electric main
Ul is pressed, wherein, positive surge trigger voltage Uh is more than negative sense surge trigger voltage Ul.Control unit 40 respectively with zero passage detection list
First 20, first detection branch 301, the second detection branch 302 are connected with the 3rd detection branch 303, and control unit 40 is in exchange city
The zero passage interval judgement current surge voltage Uac of electricity triggers surge protection when being more than predetermined reference voltage Uref, and in exchange city
Electricity be not in zero passage it is interval when according to the relation and current wave between current surge voltage Uac and positive surge trigger voltage Uh
The relation between voltage Uac and negative sense surge trigger voltage Ul is gushed to judge whether to trigger surge protection.DC power supply unit 50 with
Control unit 40 is connected, and DC power supply unit 50 is used to power to control unit 40.Wherein, predetermined reference voltage Uref can root
Preset according to actual conditions.
Further, in embodiment of the present utility model, when electric main is not in zero passage interval, if current wave
Gush voltage Uac and be more than positive surge trigger voltage Uh, the triggering surge protection of control unit 40；If current surge voltage Uac is small
In negative sense surge trigger voltage Ul, the triggering surge protection of control unit 40.
Specifically, as shown in figure 1, electric main is converted to Rectified alternating current, zero passage detection unit 20 by rectification unit 10
Rectified alternating current is detected and zero cross signal is generated, control unit 40 judges whether electric main is according to zero cross signal
Zero passage is interval.
If it is determined that electric main is interval in zero passage, to avoid surge protection during zero passage from misoperation occur, control is single
Member 40 judges whether current surge voltage Uac is more than predetermined reference voltage Uref using unidirectional surge protection, i.e. control unit 40,
If Uac is more than Uref, illustrate that positive surge occurs in electric main, to avoid surge from producing interference to home appliance, control is single
Member 40 triggers surge protection.
If it is determined that electric main to be not in zero passage interval, in order to realize that positive surge protection and negative sense surge are protected simultaneously
Shield, and the sensitivity of surge protection is improved, control unit 40 uses two-way surge protection, i.e., control unit 40 is according to current surge
Voltage Uac, forward direction surge trigger voltage Uh and negative sense surge trigger voltage Ul judge whether electric main surge occurs.Wherein,
If Uac ＞ Uh, illustrate that positive surge occurs in electric main, to avoid surge from producing interference, control unit 40 to home appliance
Trigger surge protection；And if Uac ＜ Ul, illustrate that negative sense surge occurs in electric main, to avoid surge from producing home appliance
Interference, the triggering surge protection of control unit 40.
Thus, the circuit detects that the zero passage of electric main is interval by increasing zero passage detection unit, and passes through control unit
Control surge protection circuit to realize different surge protections according to whether electric main is in zero passage interval, i.e., it is interval in zero passage
Using unidirectional surge protection, two-way surge protection is used in non-zero passage interval, so as to can both realize bidirectional protective, protection is improved
Sensitivity, can avoid surge during zero passage from protecting by mistake again.
It should be noted that in embodiment of the present utility model, to ensure the sensitivity of surge protection, it is to avoid surge is protected
Shield occurs misoperation in zero passage interval, and the zero passage interval time is less than 2.5ms.
It is described in detail how the utility model is realized in electric main zero passage interval using unidirectional surge below in conjunction with Fig. 2
Protection, two-way surge protection is used in non-zero passage interval.
According to one embodiment of the present utility model, as shown in Fig. 2 zero passage detection unit 20 can include：First resistor
R1, second resistance R2 and the first electric capacity C1.Wherein, first resistor R1 one end passes through the first current-limiting resistance r1 of series connection and second
Current-limiting resistance r2 is connected with the positive output end V+ of rectification unit 10.Second resistance R2 one end and first resistor R1 other end phase
Even and with first node Q1, the second resistance R2 other end is grounded, first node Q1 and the zero passage detection end of control unit 40
ZERO is connected.First electric capacity C1 is in parallel with second resistance R2.
Specifically, Rectified alternating current is formed after the rectified rectification of unit 10 of electric main, Rectified alternating current is examined by zero passage
Survey after R1, R2 and C1 partial pressure in unit 20, form zero cross signal.The zero passage detection end ZERO of control unit 40 obtains zero passage letter
Number, and zero cross signal and default fixed voltage V1 are compared to judge whether electric main interval in zero passage.Such as Fig. 3 institutes
Show, if the voltage Vzero of zero cross signal is less than default fixed voltage V1, illustrate that electric main is in zero passage interval.Wherein, in advance
If fixed voltage V1 need to be preset according to actual conditions, but according to sensitivity requirement, the general warranty zero passage interval time is small
In 2.5ms.
According to one embodiment of the present utility model, as shown in Fig. 2 the first detection branch 301 includes：3rd resistor R3,
4th resistance R4 and the second electric capacity C2.Wherein, 3rd resistor R3 one end passes through the 3rd current-limiting resistance r3 and rectification unit 10
Positive output end V+ is connected.4th resistance R4 one end is connected with the 3rd resistor R3 other end and with Section Point Q2, the 4th
Resistance R4 other end ground connection, Section Point Q2 is connected with the first surge test side H of control unit 40.Second electric capacity C2 and
Four resistance R4 are in parallel.
Second detection branch 302 includes：5th resistance R5, the 6th resistance R6 and the 3rd electric capacity C3.Wherein, the 5th resistance R5
One end be connected with 3rd resistor R3 one end.6th resistance R6 one end is connected with the 5th resistance R5 other end and with the
Three node Q3, the 6th resistance R6 other end ground connection, the 3rd node Q3 is connected with the second surge test side AC of control unit 40.
3rd electric capacity C3 is in parallel with the 6th resistance R6.
3rd detection branch 303 includes：7th resistance R7, the 8th resistance R8 and the 4th electric capacity C4.Wherein, the 7th resistance R7
One end be connected respectively with 3rd resistor R3 one end and the 5th resistance R5 one end.8th resistance R8 one end and the 7th resistance
The R7 other end is connected and the other end with fourth node Q4, the 8th resistance R8 is grounded, fourth node Q4 and control unit 40
The 3rd surge test side L be connected.4th electric capacity C4 is in parallel with the 8th resistance R8.
It should be noted that in embodiment of the present utility model, the second electric capacity C2 capacitance and the 4th electric capacity C4 appearance
Value is equal, and the capacitance more than the 3rd electric capacity C3.That is, the relation of C2, C4 and C3 capacitance is：C2=C4 ＞ C3.
Specifically, as shown in Fig. 2 the power supply circuit of home appliance is in addition to including rectification unit 10, it can also include pressure-sensitive
Resistance R and filter capacitor C, to carry out voltage clamping when circuit bears overvoltage, absorbs unnecessary electric current to protect Sensitive Apparatus.
Surge protection circuit will ensure when electric main is normal, Uh ＞ Uac ＞ Ul, specifically can be by setting R4, R6 and R8 size
Realize, wherein, R4 ＞ R6 ＞ R8.
When electric main is normal, Uh, Uac, Ul and Vzero that detection unit 40 is detected curve are as shown in Figure 3.
When electric main is in zero passage interval, if positive surge occurs in electric main, Uac can leap high.And handing over
When stream civil power is not in zero passage interval, if there is positive surge in electric main, then Uh, Uac and Ul can be raised, due to C3's
Capacitance is less than C2, so Uac can be more than Uh；And if negative sense surge occurs in electric main, then Uh, Uac and Ul can decline, by
It is less than C4 in C3 capacitance, so Uac can be less than Ul.
From the foregoing, when electric main is in zero passage interval, if control unit 40 detects Uac ＞ Uref, saying
There is positive surge in bright now electric main, and to avoid surge from producing interference to home appliance, the triggering surge of control unit 40 is protected
Shield.And when electric main is not in zero passage interval, if control unit 40 detects Uac ＞ Uh, illustrate now electric main
There is positive surge, to avoid surge from producing interference, the triggering surge protection of control unit 40 to home appliance；If control unit
40 detect Uac ＜ Ul, illustrate that now negative sense surge occurs in electric main, to avoid surge from producing interference, control to home appliance
Unit 40 processed triggers surge protection.So as to realize the protection to home appliance.
In summary, according to the surge protection circuit for home appliance of the utility model embodiment, examined by zero passage
Survey unit to carry out zero passage detection to Rectified alternating current to obtain the zero passage interval of electric main, and pass through two-way surge detection unit
The first detection branch, the second detection branch and the 3rd detection branch, respectively detect electric main positive surge trigger voltage,
Current surge voltage and negative sense surge trigger voltage, control unit are big in the current surge voltage of zero passage interval judgement of electric main
Surge protection is triggered when predetermined reference voltage, and when electric main is not in zero passage interval according to current surge voltage and just
Judge whether to the relation between the relation between surge trigger voltage and current surge voltage and negative sense surge trigger voltage
Trigger surge protection.Thus, the circuit uses two-way by using unidirectional surge protection in zero passage interval, and in non-zero passage interval
Surge protection, so as to can both realize bidirectional protective, improves protection sensitivity, and surge during zero passage can be avoided to protect by mistake again.
In addition, the utility model also proposes a kind of home appliance, it includes the above-mentioned surge protection for home appliance
Circuit.
According to the home appliance of the utility model embodiment, by the above-mentioned surge protection circuit for home appliance,
Unidirectional surge protection is used in the zero passage interval of electric main, it is interval in non-zero passage so as to avoid surge protection misoperation
Using two-way surge protection, so as to improve the sensitivity of surge protection, it is possible thereby to improve the reliable of home appliance work
Property.
Based on above-mentioned home appliance, the utility model also proposes a kind of surge protection method of home appliance.Fig. 4 is root
According to the flow chart of the surge protection method of the home appliance of the utility model one embodiment.As shown in figure 4, the surge protection side
Method comprises the following steps：
S1, the zero passage that zero passage detection is carried out to Rectified alternating current to obtain electric main is interval.
Specifically, as shown in Fig. 2 forming Rectified alternating current after electric main is rectified, after Rectified alternating current is by partial pressure,
Form zero cross signal.Zero cross signal and default fixed voltage V1 are compared to judge whether electric main was in zero passage area
Between.If as shown in figure 3, the voltage Vzero of zero cross signal is less than default fixed voltage V1, judging that electric main was in
Zero is interval.Wherein, presetting fixed voltage V1 can be preset according to actual conditions.
It should be noted that in embodiment of the present utility model, to ensure the sensitivity of surge protection, it is to avoid surge is protected
Shield occurs misoperation in zero passage interval, and the zero passage interval time is less than 2.5ms.
S2, carries out surge detection to Rectified alternating current to obtain electric main respectively just by two-way surge detection unit
To surge trigger voltage Uh, the current surge voltage Uac of electric main and electric main negative sense surge trigger voltage Ul, its
In, positive surge trigger voltage Uh is more than negative sense surge trigger voltage Ul.
S3, is triggered when the current surge voltage Uac of the zero passage interval judgement of electric main is more than predetermined reference voltage Uref
Surge protection, and when electric main is not in zero passage interval according to current surge voltage Uac and positive surge trigger voltage Uh
Between relation and current surge voltage Uac and negative sense surge trigger voltage Ul between relation judge whether triggering surge protect
Shield.Wherein, predetermined reference voltage Uref can be preset according to actual conditions.
Further, in embodiment of the present utility model, when electric main is not in zero passage interval, if current wave
Gush voltage Uac and be more than positive surge trigger voltage Uh, trigger surge protection；If current surge voltage Uac is less than negative sense surge
Trigger voltage Ul, triggers surge protection.
Specifically, electric main is converted to Rectified alternating current by the power supply circuit of home appliance, by Rectified alternating current
Detected and generate zero cross signal, judge whether electric main is interval in zero passage further according to zero cross signal.
If it is determined that electric main is interval in zero passage, to avoid surge protection during zero passage from misoperation occur, using list
To surge protection, that is, judge whether current surge voltage Uac is more than predetermined reference voltage Uref, if Uac is more than Uref, explanation
There is positive surge in electric main, to avoid surge from producing interference to home appliance, triggers surge protection.
If it is determined that electric main to be not in zero passage interval, in order to realize that positive surge protection and negative sense surge are protected simultaneously
Shield, and improve the sensitivity of surge protection, it is possible to while being protected to positive surge and negative sense surge, using two-way surge
Protection, i.e., judge electric main according to current surge voltage Uac, forward direction surge trigger voltage Uh and negative sense surge trigger voltage Ul
Whether surge is occurred.Wherein, if Uac ＞ Uh, illustrate that positive surge occurs in electric main, to avoid surge from producing home appliance
Raw interference, triggers surge protection；And if Uac ＜ Ul, illustrate that negative sense surge occurs in electric main, to avoid surge from setting household electrical appliances
It is standby to produce interference, trigger surge protection.
Thus, whether this method is interval by the zero passage for detecting electric main, and interval in zero passage according to electric main
To control surge protection circuit to realize different surge protections, i.e., unidirectional surge protection is used in zero passage interval, in non-zero passage area
Between use two-way surge protection, so as to can both realize bidirectional protective, improve protection sensitivity, wave during zero passage can be avoided again
Gush and protect by mistake.
To make those skilled in the art be more clearly understood that the utility model, illustrate home appliance below in conjunction with Fig. 5
The detailed process of surge protection method.Fig. 5 is the surge protection side of the home appliance according to one specific example of the utility model
The flow chart of method, as shown in figure 5, the surge protection method comprises the following steps：
S101, starts.
S102, judges whether electric main is interval in zero passage.If it is, performing step S103；If it is not, then performing
Step S104.
S103, judges whether Uac is more than Uref.If it is, performing step S106；If it is not, then performing S107.
S104, judges whether Uac is more than Uh.If it is, performing step S106；If it is not, then performing step S105.
S105, judges whether Uac is less than Ul.If it is, performing step S106；If it is not, then performing step S107.
S106, triggers surge protection.
S107, terminates.
According to the surge protection method of the home appliance of the utility model embodiment, zero passage is carried out to Rectified alternating current first
Detect interval to obtain the zero passage of electric main, then, surge inspection is carried out to Rectified alternating current by two-way surge detection unit
Survey to obtain the positive surge trigger voltage, the current surge voltage of electric main and the negative sense of electric main of electric main respectively
Surge trigger voltage, when the current surge voltage of zero passage interval judgement of electric main is more than predetermined reference voltage, triggering surge is protected
Shield, and electric main be not in zero passage it is interval when according to the relation between current surge voltage and positive surge trigger voltage with
And current relation between surge voltage and negative sense surge trigger voltage judges whether to trigger surge protection.Thus, this method is led to
Cross and unidirectional surge protection is used in zero passage interval, and two-way surge protection is used in non-zero passage interval, so as to can both realize double
To protection, protection sensitivity is improved, surge during zero passage can be avoided to protect by mistake again.
In description of the present utility model, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " suitable
The orientation or position relationship of the instruction such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " are based on orientation shown in the drawings
Or position relationship, be for only for ease of description the utility model and simplify and describe, rather than indicate or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
It is individual, three etc., unless otherwise specifically defined.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the common skill of this area
For art personnel, concrete meaning of the above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature is "above" or "below" second feature
Can be that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be with
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present utility model or example.In this manual, to the schematic table of above-mentioned term
State and be necessarily directed to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be with
Combined in an appropriate manner in any one or more embodiments or example.In addition, in the case of not conflicting, this area
Technical staff the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification can be entered
Row is combined and combined.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to limitation of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, changed, replaced and modification.
Claims (9)
1. a kind of surge protection circuit for home appliance, it is characterised in that the power supply circuit of the home appliance includes whole
Unit is flowed, the rectification unit by the electric main of input to be converted to Rectified alternating current, and the surge protection circuit includes：
Zero passage detection unit, the zero passage detection unit is connected with the output end of the rectification unit, the zero passage detection unit
It is interval to obtain the zero passage of the electric main by carrying out zero passage detection to the Rectified alternating current；
Two-way surge detection unit, the two-way surge detection unit is connected with the output end of the rectification unit, described two-way
Surge detection unit includes the first detection branch, the second detection branch and the 3rd detection branch, and first detection branch passes through
Surge detection is carried out to the Rectified alternating current to obtain the positive surge trigger voltage of the electric main, second detection
Branch road is detected to obtain the current surge voltage of the electric main, the described 3rd by carrying out surge to the Rectified alternating current
Detection branch by carrying out surge detection to the Rectified alternating current to obtain the negative sense surge trigger voltage of the electric main,
Wherein, the positive surge trigger voltage is more than the negative sense surge trigger voltage；
Control unit, described control unit respectively with the zero passage detection unit, first detection branch, the second detection branch
It is connected with the 3rd detection branch, current surge voltage is big described in zero passage interval judgement of the described control unit in the electric main
Surge protection is triggered when predetermined reference voltage, and when the electric main is not in zero passage interval according to the current surge
Relation and the current surge voltage between voltage and the positive surge trigger voltage trigger electricity with the negative sense surge
Relation between pressure judges whether to trigger surge protection；
DC power supply unit, the DC power supply unit is connected with described control unit, and the DC power supply unit is used for institute
Control unit is stated to power.
2. it is used for the surge protection circuit of home appliance as claimed in claim 1, it is characterised in that in the electric main not
During in zero passage interval, wherein,
If the current surge voltage is more than the positive surge trigger voltage, described control unit triggering surge protection；
If the current surge voltage is less than the negative sense surge trigger voltage, described control unit triggering surge protection.
3. it is used for the surge protection circuit of home appliance as claimed in claim 1 or 2, it is characterised in that the zero passage detection
Unit includes：
First resistor, the first current-limiting resistance and the second current-limiting resistance and the rectification of one end of the first resistor by series connection
The positive output end of unit is connected；
Second resistance, one end of the second resistance is connected with the other end of the first resistor and with first node, described
The other end ground connection of second resistance, the first node is connected with the zero passage detection end of described control unit；
First electric capacity, first electric capacity is in parallel with the second resistance.
4. it is used for the surge protection circuit of home appliance as claimed in claim 1 or 2, it is characterised in that first detection
Branch road includes：
3rd resistor, one end of the 3rd resistor is connected by the 3rd current-limiting resistance with the positive output end of the rectification unit；
4th resistance, one end of the 4th resistance is connected with the other end of the 3rd resistor and with Section Point, described
The other end ground connection of 4th resistance, the Section Point is connected with the first surge test side of described control unit；
Second electric capacity, second electric capacity and the 4th resistor coupled in parallel.
5. it is used for the surge protection circuit of home appliance as claimed in claim 4, it is characterised in that second detection branch
Including：
5th resistance, one end of the 5th resistance is connected with one end of the 3rd resistor；
6th resistance, one end of the 6th resistance is connected with the other end of the 5th resistance and with the 3rd node, described
The other end ground connection of 6th resistance, the 3rd node is connected with the second surge test side of described control unit；
3rd electric capacity, the 3rd electric capacity and the 6th resistor coupled in parallel.
6. it is used for the surge protection circuit of home appliance as claimed in claim 5, it is characterised in that the 3rd detection branch
Including：
7th resistance, one end of the 7th resistance one end respectively with the 3rd resistor and one end phase of the 5th resistance
Even；
8th resistance, one end of the 8th resistance is connected with the other end of the 7th resistance and with fourth node, described
The other end ground connection of 8th resistance, the fourth node is connected with the 3rd surge test side of described control unit；
4th electric capacity, the 4th electric capacity and the 8th resistor coupled in parallel.
7. it is used for the surge protection circuit of home appliance as claimed in claim 6, it is characterised in that the appearance of second electric capacity
Value is equal with the capacitance of the 4th electric capacity, and more than the capacitance of the 3rd electric capacity.
8. be used for the surge protection circuit of home appliance as claimed in claim 1, it is characterised in that the zero passage it is interval when
Between be less than 2.5ms.
9. a kind of home appliance, it is characterised in that including the wave for home appliance as any one of claim 1-8
Gush protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720340428.XU CN206595714U (en) | 2017-03-31 | 2017-03-31 | Home appliance and the surge protection circuit for home appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720340428.XU CN206595714U (en) | 2017-03-31 | 2017-03-31 | Home appliance and the surge protection circuit for home appliance |
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| Publication Number | Publication Date |
|---|---|
| CN206595714U true CN206595714U (en) | 2017-10-27 |
Family
ID=60122443
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720340428.XU Active CN206595714U (en) | 2017-03-31 | 2017-03-31 | Home appliance and the surge protection circuit for home appliance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965412A (en) * | 2019-05-20 | 2020-11-20 | 浙江宇视科技有限公司 | Surge detection method, device, equipment and storage medium |
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2017
- 2017-03-31 CN CN201720340428.XU patent/CN206595714U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965412A (en) * | 2019-05-20 | 2020-11-20 | 浙江宇视科技有限公司 | Surge detection method, device, equipment and storage medium |
| CN111965412B (en) * | 2019-05-20 | 2023-04-07 | 浙江宇视科技有限公司 | Surge detection method, device, equipment and storage medium |
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