CN108666994B - Household appliance and the surge protection circuit for household appliance, method - Google Patents
Household appliance and the surge protection circuit for household appliance, method Download PDFInfo
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- CN108666994B CN108666994B CN201710210957.2A CN201710210957A CN108666994B CN 108666994 B CN108666994 B CN 108666994B CN 201710210957 A CN201710210957 A CN 201710210957A CN 108666994 B CN108666994 B CN 108666994B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
Abstract
Surge protection circuit, method the invention discloses a kind of household appliance and for household appliance, the surge protection circuit include: zero passage detection unit, by carrying out zero passage detection to Rectified alternating current to obtain the zero passage section of electric main；Two-way surge detection unit, including first to third 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 greater than predetermined reference voltage, and when electric main is not in zero passage section according between current surge voltage and positive surge trigger voltage, the relationship of negative sense surge trigger voltage judges whether to trigger surge protection.The circuit uses two-way surge protection in non-zero passage section by using unidirectional surge protection in zero passage section, so that bidirectional protective both may be implemented, improves protection sensitivity, and can accidentally protect to avoid surge when zero passage.
Description
Technical field
The present invention relates to field of home appliance technology, in particular to a kind of surge protection circuit for household appliance, one
A kind of surge protection method of kind household appliance and household appliance.
Background technique
As the improvement of people's living standards, electronic product is more and more, there is the probability of surge in entire electricity network
Increasing, being in addition struck by lightning also most likely results in entire electricity network and surging signal occurs, to generate to electricity consumption product dry
It disturbs or even damages.
In order to effectively inhibit the interference of surging signal, generally surge protection circuit can be set in electricity consumption product.But mesh
There is also certain defects for preceding surge protection circuit, so needing to improve surge protection circuit.
Summary of the invention
The application is to be made based on inventor to the understanding of following problems and research:
In the related technology, by unidirectional surge protection circuit being arranged in home appliance to inhibit the interference of surging signal,
However, unidirectional surge protection circuit can only realize positive surge protection, and sensitivity is lower.And in order to realize that negative sense surge is protected
Shield, can be arranged 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 generated at the zero crossing of electric main and accidentally be protected
Shield, causes household appliance can not normal use.
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose is to propose that a kind of surge protection circuit for household appliance, the circuit are unidirectional by using in zero passage section
Surge protection, and two-way surge protection is used in non-zero passage section, so that bidirectional protective both may be implemented, it is sensitive to improve protection
Degree, but can be to avoid zero passage when surge accidentally protect.
Second object of the present invention is to propose a kind of household appliance.
Third object of the present invention is to propose a kind of surge protection method of household appliance.
In order to achieve the above objectives, first aspect present invention embodiment proposes a kind of surge protection electricity for household appliance
Road, the power supply circuit of the household appliance include rectification unit, and the rectification unit is to be converted to the electric main of input
Rectified alternating current, the surge protection circuit include: zero passage detection unit, the zero passage detection unit and the rectification unit
Output end is connected, and the zero passage detection unit is by carrying out zero passage detection to the Rectified alternating current to obtain the electric main
Zero passage section；Two-way surge detection unit, the two-way surge detection unit are connected with the output end of the rectification unit, institute
Stating two-way surge detection unit includes the first detection branch, the second detection branch and third detection branch, the first detection branch
Road obtains the positive surge trigger voltage of the electric main by carrying out surge detection to the Rectified alternating current, and described the
Two detection branch are by carrying out surge detection to the Rectified alternating current to obtain the current surge voltage of the electric main, institute
Third detection branch is stated to touch by carrying out surge detection to the Rectified alternating current with the negative sense surge for obtaining the electric main
Power generation pressure, wherein the forward direction surge trigger voltage is greater than the negative sense surge trigger voltage；Control unit, the control are single
Member is connected with the zero passage detection unit, first detection branch, the second detection branch and third detection branch respectively, described
Triggering wave when control unit current surge voltage described in the zero passage interval judgement of the electric main is greater than predetermined reference voltage
Protection is gushed, and is triggered when the electric main is not in zero passage section according to the current surge voltage and the positive surge
The relationship between relationship and the current surge voltage and the negative sense surge trigger voltage between voltage judges whether to touch
Send out surge protection.
Surge protection circuit according to an embodiment of the present invention for household appliance is straight to pulsing by zero passage detection unit
Galvanic electricity carries out zero passage detection to obtain the zero passage section of electric main, and by two-way surge detection unit first to third inspection
Survey positive surge trigger voltage, current surge voltage and negative sense surge trigger voltage that branch detects electric main respectively.Control
Unit triggers surge protection when the current surge voltage of zero passage interval judgement of electric main is greater than predetermined reference voltage, and is handing over
When stream alternating current is not in zero passage section according between current surge voltage and positive surge trigger voltage relationship and current wave
The relationship between voltage and negative sense surge trigger voltage is gushed to judge whether to trigger surge protection.The circuit passes through in zero passage as a result,
Section uses unidirectional surge protection, and is mentioned using two-way surge protection so that bidirectional protective both may be implemented in non-zero passage section
High protection sensitivity, but can be to avoid zero passage when surge accidentally protect.
In addition, the surge protection circuit for household appliance proposed according to that above embodiment of the present invention can also have as
Under additional technical characteristic:
According to one embodiment of present invention, when the electric main is not in zero passage section, wherein if described work as
Preceding surge voltage is greater than the positive surge trigger voltage, and described control unit triggers surge protection；If the current surge
Voltage is less than the negative sense surge trigger voltage, and described control unit triggers surge protection.
According to one embodiment of present invention, the zero passage detection unit includes: first resistor, and the one of the first resistor
End is connected by concatenated first current-limiting resistance and the second current-limiting resistance with the positive output end of the rectification unit；Second resistance,
One end of the second resistance is connected with the other end of the first resistor and has a first node, the second resistance it is another
End ground connection, the first node are connected with the zero passage detection end of described control unit；First capacitor, the first capacitor with it is described
Second resistance is in parallel.
According to one embodiment of present invention, first detection branch includes: 3rd resistor, and the one of the 3rd resistor
End is connected by third current-limiting resistance with the positive output end of the rectification unit；4th resistance, one end of the 4th resistance with
The other end of the 3rd resistor is connected and has second node, and the other end of the 4th resistance is grounded, the second node
It is connected with the first surge test side of described control unit；Second capacitor, second capacitor and the 4th resistor coupled in parallel.
According to one embodiment of present invention, second detection branch includes: the 5th resistance, and the one of the 5th resistance
End is connected with one end of the 3rd resistor；6th resistance, one end of the 6th resistance and the other end of the 5th resistance
It is connected and there is third node, the other end of the 6th resistance is grounded, and the second of the third node and described control unit
Surge test side is connected；Third capacitor, the third capacitor and the 6th resistor coupled in parallel.
According to one embodiment of present invention, the third detection branch includes: the 7th resistance, and the one of the 7th resistance
End is connected with one end of one end of the 3rd resistor and the 5th resistance respectively；8th resistance, the one of the 8th resistance
End is connected with the other end of the 7th resistance and has fourth node, and the other end of the 8th resistance is grounded, and the described 4th
Node is connected with the third surge test side of described control unit；4th capacitor, the 4th capacitor and the 8th resistance are simultaneously
Connection.
According to one embodiment of present invention, the capacitance of second capacitor is equal with the capacitance of the 4th capacitor, and
Greater than the capacitance of the third capacitor.
According to one embodiment of present invention, the time in the zero passage section is less than 2.5ms.
In order to achieve the above objectives, second aspect of the present invention embodiment proposes a kind of household appliance comprising above-mentioned use
In the surge protection circuit of household appliance.
Household appliance according to an embodiment of the present invention, by the above-mentioned surge protection circuit for household appliance, in mistake
Zero section uses unidirectional surge protection, and uses two-way surge protection in non-zero passage section, so that bidirectional protective both may be implemented,
Improve protection sensitivity, and can be to avoid zero passage when surge accidentally protect.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of surge protection method of household appliance,
The following steps are included: carrying out zero passage detection to the Rectified alternating current to obtain the zero passage section of the electric main；Pass through institute
It states two-way surge detection unit and surge detection is carried out to the Rectified alternating current to obtain the forward direction wave of the electric main respectively
Gush the negative sense surge trigger voltage of trigger voltage, the current surge voltage of the electric main and the electric main, wherein institute
Positive surge trigger voltage is stated greater than the negative sense surge trigger voltage；Described in the zero passage interval judgement of the electric main when
Preceding surge voltage be greater than predetermined reference voltage when trigger surge protection, and when the electric main is not in zero passage section according to
Relationship and the current surge voltage between the current surge voltage and the positive surge trigger voltage are born with described
Judge whether to trigger surge protection to the relationship between surge trigger voltage.
The surge protection method of household appliance according to an embodiment of the present invention, by carrying out zero passage detection to Rectified alternating current
To obtain the zero passage section of electric main, then, by two-way surge detection unit to Rectified alternating current carry out surge detection with
The positive surge trigger voltage of electric main, the negative sense surge of the current surge voltage of electric main and electric main are obtained respectively
Trigger voltage, and triggering surge is protected when the current surge voltage of zero passage interval judgement of electric main is greater than predetermined reference voltage
Shield, and when electric main is not in zero passage section according to the relationship between current surge voltage and positive surge trigger voltage
And the relationship between current surge voltage and negative sense surge trigger voltage judges whether to trigger surge protection.This method as a result,
By using unidirectional surge protection in zero passage section, and two-way surge protection is used in non-zero passage section, to both may be implemented
Bidirectional protective, improve protection sensitivity, and can be to avoid zero passage when surge accidentally protect.
In addition, the surge protection method of the household appliance proposed according to that above embodiment of the present invention can also have it is following attached
The technical characteristic added:
According to one embodiment of present invention, when the electric main is not in zero passage section, wherein if described work as
Preceding surge voltage is greater than the positive surge trigger voltage, triggers surge protection；If the current surge voltage is less than described
Negative sense surge trigger voltage triggers surge protection.
According to one embodiment of present invention, the time in the zero passage section is less than 2.5ms.
Detailed description of the invention
Fig. 1 is the block diagram of the surge protection circuit according to an embodiment of the invention for household appliance；
Fig. 2 is the circuit diagram of the surge protection circuit according to an embodiment of the invention for household appliance；
Fig. 3 is the waveform diagram of each test side detection when electric main according to an embodiment of the invention is normal；
Fig. 4 is the flow chart of the surge protection method of household appliance according to an embodiment of the invention；And
Fig. 5 is the flow chart of the surge protection method of the household appliance of a specific example according to the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
With reference to the accompanying drawing come describe the embodiment of the present invention for the surge protection circuit of household appliance, household appliance and
The surge protection method of household appliance.
Fig. 1 is the block diagram of the surge protection circuit according to an embodiment of the invention for household appliance.Such as
Shown in Fig. 1, the power supply circuit of household appliance includes rectification unit 10, and rectification unit 10 is to be converted to the electric main of input
Rectified alternating current.Surge protection circuit includes: zero passage detection unit 20, two-way surge detection unit 30 and control unit 40.
Wherein, zero passage detection unit 20 is connected with the output end of rectification unit 10, and zero passage detection unit 20 is by pulsation
Direct current carries out zero passage detection to obtain the zero passage section of electric main.Two-way surge detection unit 30 is defeated with rectification unit 10
Outlet is connected, and two-way surge detection unit 30 includes the first detection branch 301, the second detection branch 302 and third detection branch
303, the first detection branch 301 triggers electricity by carrying out surge detection to Rectified alternating current with the positive surge for obtaining electric main
Uh is pressed, the second detection branch 302 is by carrying out surge detection to Rectified alternating current to obtain the current surge voltage of electric main
Uac, third detection branch 303 trigger electricity by carrying out surge detection to Rectified alternating current with the negative sense surge for obtaining electric main
Press Ul, wherein positive surge trigger voltage Uh is greater 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 third 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 greater than predetermined reference voltage Uref, and in exchange city
When electricity is not in zero passage section according between current surge voltage Uac and positive surge trigger voltage Uh relationship and current wave
The relationship between voltage Uac and negative sense surge trigger voltage Ul is gushed to judge whether to trigger surge protection.Wherein, predetermined reference voltage
Uref can be preset according to the actual situation.
Further, in an embodiment of the present invention, when electric main is not in zero passage section, if current surge electricity
Uac is pressed to be greater than positive surge trigger voltage Uh, control unit 40 triggers surge protection；If current surge voltage Uac is less than negative
To surge trigger voltage Ul, control unit 40 triggers surge protection.
Specifically, as shown in Figure 1, electric main is converted to Rectified alternating current, zero passage detection unit 20 by rectification unit 10
Zero cross signal is detected and generated to Rectified alternating current, and control unit 40 judges whether electric main is according to zero cross signal
Zero passage section.
If it is determined that electric main is in zero passage section, surge protection is malfunctioned when to avoid zero passage, and control is single
Member 40 uses unidirectional surge protection, i.e. control unit 40 judges whether current surge voltage Uac is greater than predetermined reference voltage Uref,
If Uac is greater than Uref, illustrate that positive surge occurs in electric main, to avoid surge from generating interference to household appliance, control is single
Member 40 triggers surge protection.
If it is determined that electric main is not in zero passage section, 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 generating interference, control unit 40 to household appliance
Trigger surge protection；And if Uac < Ul, illustrate that negative sense surge occurs in electric main, to avoid surge from generating household appliance
Interference, control unit 40 trigger surge protection.
The circuit detects the zero passage section of electric main by increasing zero passage detection unit as a result, and passes through control unit
It controls surge protection circuit according to whether electric main is in zero passage section and realizes different surge protections, i.e., in zero passage section
Using unidirectional surge protection, two-way surge protection is used in non-zero passage section, so that bidirectional protective both may be implemented, improves protection
Sensitivity, but can be to avoid zero passage when surge accidentally protect.
It should be noted that in an embodiment of the present invention, for the sensitivity for guaranteeing surge protection, surge protection is avoided to exist
Zero passage section malfunctions, and the time in zero passage section is less than 2.5ms.
It is protected in electric main zero passage section using unidirectional surge below in conjunction with how Fig. 2 the present invention is described in detail is realized
Shield uses two-way surge protection in non-zero passage section.
According to one embodiment of present invention, as shown in Fig. 2, zero passage detection unit 20 may include: first resistor R1,
Two resistance R2 and first capacitor C1.Wherein, one end of first resistor R1 passes through concatenated first current-limiting resistance r1 and the second current limliting
Resistance r2 is connected with the positive output end V+ of rectification unit 10.One end of second resistance R2 be connected with the other end of first resistor R1 and
With first node Q1, the other end of second resistance R2 is grounded, the zero passage detection end ZERO of first node Q1 and control unit 40
It is connected.First capacitor C1 is in parallel with second resistance R2.
Specifically, the rectified unit 10 of electric main forms Rectified alternating current after rectifying, and Rectified alternating current is examined by zero passage
After surveying R1, R2 and C1 partial pressure in unit 20, zero cross signal is formed.The zero passage detection end ZERO of control unit 40 obtains zero passage letter
Number, and zero cross signal is compared with default fixed voltage V1 to judge whether electric main is in zero passage section.Such as Fig. 3 institute
Show, if the voltage Vzero of zero cross signal is less than default fixed voltage V1, illustrates that electric main is in zero passage section.Wherein, in advance
If fixed voltage V1 need to be preset according to the actual situation, but according to sensitivity requirement, the time in general warranty zero passage section is small
In 2.5ms.
According to one embodiment of present invention, as shown in Fig. 2, the first detection branch 301 includes: 3rd resistor R3, the 4th
Resistance R4 and the second capacitor C2.Wherein, one end of 3rd resistor R3 passes through the just defeated of third current-limiting resistance r3 and rectification unit 10
Outlet V+ is connected.One end of 4th resistance R4 is connected with the other end of 3rd resistor R3 and has second node Q2, the 4th resistance
The other end of R4 is grounded, and second node Q2 is connected with the first surge test side H of control unit 40.The electricity of second capacitor C2 and the 4th
It is in parallel to hinder R4.
Second detection branch 302 includes: the 5th resistance R5, the 6th resistance R6 and third capacitor C3.Wherein, the 5th resistance R5
One end be connected with one end of 3rd resistor R3.One end of 6th resistance R6 is connected with the other end of the 5th resistance R5 and has the
The other end of three node Q3, the 6th resistance R6 is grounded, and third node Q3 is connected with the second surge test side AC of control unit 40.
Third capacitor C3 is in parallel with the 6th resistance R6.
Third detection branch 303 includes: the 7th resistance R7, the 8th resistance R8 and the 4th capacitor C4.Wherein, the 7th resistance R7
One end be connected respectively with one end of one end of 3rd resistor R3 and the 5th resistance R5.One end of 8th resistance R8 and the 7th resistance
The other end of R7 is connected and has fourth node Q4, and the other end of the 8th resistance R8 is grounded, fourth node Q4 and control unit 40
Third surge test side L be connected.4th capacitor C4 is in parallel with the 8th resistance R8.
It should be noted that in an embodiment of the present invention, the capacitance and the capacitance phase of the 4th capacitor C4 of the second capacitor C2
Deng, and it is greater than the capacitance of third capacitor C3.That is, the relationship of C2, C4 and C3 capacitance are as follows: C2=C4 > C3.
It specifically, can also include pressure-sensitive as shown in Fig. 2, the power supply circuit of household appliance is in addition to including rectification unit 10
Resistance R and filter capacitor C absorbs extra electric current to carry out voltage clamping when circuit bears over-voltage to protect Sensitive Apparatus.
Surge protection circuit will guarantee that when electric main is normal, Uh > Uac > Ul can specifically pass through the size of setting R4, R6 and R8
It realizes, wherein R4 > R6 > R8.
When electric main is normal, the curve of Uh, Uac, Ul and Vzero that detection unit 40 detects are as shown in Figure 3.
When electric main is in zero passage section, if positive surge occurs in electric main, Uac can leap high.And it is handing over
When stream alternating current is not in zero passage section, if positive surge occurs in electric main, Uh, Uac and Ul can be increased, due to C3's
Capacitance is less than C2, so Uac can be greater than Uh；And if negative sense surge occurs in electric main, Uh, Uac and Ul can decline, by
It is less than C4 in the capacitance of C3, so Uac can be less than Ul.
It can be seen from the above, if control unit 40 detects Uac > Uref, being said when electric main is in zero passage section
There is positive surge in bright electric main at this time, and to avoid surge from generating interference to household appliance, control unit 40 triggers surge and protects
Shield.And when electric main is not in zero passage section, if control unit 40 detects Uac > Uh, illustrate electric main at this time
There is positive surge, to avoid surge from generating interference to household appliance, control unit 40 triggers surge protection；If control unit
40 detect Uac < Ul, illustrate that negative sense surge occurs in electric main at this time, to avoid surge from generating interference, control to household appliance
Unit 40 processed triggers surge protection.To realize the protection to household appliance.
In conclusion the surge protection circuit according to an embodiment of the present invention for household appliance, passes through zero passage detection list
Member carries out zero passage detection to Rectified alternating current to obtain the zero passage section of electric main, and pass through two-way surge detection unit the
One detection branch, the second detection branch and third detection branch detect the positive surge trigger voltage, current of electric main respectively
Surge voltage and negative sense surge trigger voltage, control unit are greater than pre- in the current surge voltage of zero passage interval judgement of electric main
If triggering surge protection when reference voltage, and when electric main is not in zero passage section according to current surge voltage and forward direction wave
The relationship gushed between the relationship between trigger voltage and current surge voltage and negative sense surge trigger voltage judges whether to trigger
Surge protection.The circuit is by using unidirectional surge protection in zero passage section as a result, and uses two-way surge in non-zero passage section
Protection improves protection sensitivity so that bidirectional protective both may be implemented, but can be to avoid zero passage when surge accidentally protect.
In addition, the present invention also proposes a kind of household appliance comprising the above-mentioned surge protection circuit for household appliance.
Household appliance according to an embodiment of the present invention is being handed over by the above-mentioned surge protection circuit for household appliance
The zero passage section for flowing alternating current uses unidirectional surge protection, so as to avoid surge protection from malfunctioning, uses in non-zero passage section
Two-way surge protection, so as to improve the sensitivity of surge protection, it is possible thereby to improve the reliability of household appliance work.
Based on above-mentioned household appliance, the present invention also proposes a kind of surge protection method of household appliance.Fig. 4 is according to this
The flow chart of the surge protection method of the household appliance of invention one embodiment.As shown in figure 4, the surge protection method include with
Lower step:
S1 carries out zero passage detection to Rectified alternating current to obtain the zero passage section of electric main.
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 is compared with default fixed voltage V1 to judge whether electric main was in zero passage area
Between.As shown in figure 3, judging that electric main was in if the voltage Vzero of zero cross signal is less than default fixed voltage V1
Zero section.Wherein, presetting fixed voltage V1 can be preset according to the actual situation.
It should be noted that in an embodiment of the present invention, for the sensitivity for guaranteeing surge protection, surge protection is avoided to exist
Zero passage section malfunctions, and the time in zero passage section is less than 2.5ms.
S2 carries out surge detection to Rectified alternating current by two-way surge detection unit to obtain electric main respectively just
To the negative sense surge trigger voltage Ul of surge trigger voltage Uh, the current surge voltage Uac of electric main and electric main,
In, positive surge trigger voltage Uh is greater 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 greater than predetermined reference voltage Uref
Surge protection, and when electric main is not in zero passage section according to current surge voltage Uac and positive surge trigger voltage Uh
Between relationship and current surge voltage Uac and negative sense surge trigger voltage Ul between relationship judge whether trigger surge protect
Shield.Wherein, predetermined reference voltage Uref can be preset according to the actual situation.
Further, in an embodiment of the present invention, when electric main is not in zero passage section, if current surge electricity
It presses Uac to be greater than positive surge trigger voltage Uh, triggers surge protection；If current surge voltage Uac is triggered less than negative sense surge
Voltage Ul triggers surge protection.
Specifically, electric main is converted to Rectified alternating current by the power supply circuit of household appliance, by Rectified alternating current
Zero cross signal is detected and generated, judges whether electric main is in zero passage section further according to zero cross signal.
If it is determined that electric main is in zero passage section, surge protection is malfunctioned when to avoid zero passage, using list
To surge protection, that is, judge whether current surge voltage Uac is greater than predetermined reference voltage Uref, if Uac is greater than Uref, explanation
There is positive surge in electric main, to avoid surge from generating interference to household appliance, triggers surge protection.
If it is determined that electric main is not in zero passage section, in order to realize that positive surge protection and negative sense surge are protected simultaneously
Shield, and the sensitivity of surge protection is improved, and can protect simultaneously 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 household 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 generate interference, trigger surge protection.
This method is by detecting the zero passage section of electric main as a result, and whether is in zero passage section according to electric main
Different surge protections is realized to control surge protection circuit, i.e., unidirectional surge protection is used in zero passage section, in non-zero passage area
Between use two-way surge protection, so that bidirectional protective both may be implemented, improve protection sensitivity, but can be to avoid zero passage when wave
It gushes and accidentally protects.
To make those skilled in the art be more clearly understood that the present invention, the surge of household appliance is illustrated below in conjunction with Fig. 5
The detailed process of guard method.Fig. 5 is the process of the surge protection method of the household appliance of a specific example according to the present invention
Figure, as shown in figure 5, the surge protection method the following steps are included:
S101 starts.
S102, judges whether electric main is in zero passage section.If so, thening follow the steps S103；If it is not, then executing
Step S104.
S103, judges whether Uac is greater than Uref.If so, thening follow the steps S106；If it is not, then executing S107.
S104, judges whether Uac is greater than Uh.If so, thening follow the steps S106；If not, thening follow the steps S105.
S105, judges whether Uac is less than Ul.If so, thening follow the steps S106；If not, thening follow the steps S107.
S106 triggers surge protection.
S107 terminates.
The surge protection method of household appliance according to an embodiment of the present invention carries out zero passage detection to Rectified alternating current first
To obtain the zero passage section of electric main, then, by two-way surge detection unit to Rectified alternating current carry out surge detection with
The positive surge trigger voltage of electric main, the negative sense surge of the current surge voltage of electric main and electric main are obtained respectively
Trigger voltage triggers surge protection when the current surge voltage of zero passage interval judgement of electric main is greater than predetermined reference voltage,
And when electric main is not in zero passage section according between current surge voltage and positive surge trigger voltage relationship and
Relationship between current surge voltage and negative sense surge trigger voltage judges whether to trigger surge protection.This method passes through as a result,
Unidirectional surge protection is used in zero passage section, and uses two-way surge protection in non-zero passage section, to both may be implemented two-way
Protection, improve protection sensitivity, and can be to avoid zero passage when surge accidentally protect.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal 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 specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of surge protection circuit for household appliance, which is characterized in that the power supply circuit of the household appliance includes whole
Unit is flowed, the electric main of input is converted to Rectified alternating current, the surge protection circuit includes: the rectification unit
Zero passage detection unit, the zero passage detection unit are connected with the output end of the rectification unit, the zero passage detection unit
By carrying out zero passage detection to the Rectified alternating current to obtain the zero passage section of the electric main；
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 third 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 is by carrying out surge detection to the Rectified alternating current to obtain the current surge voltage of the electric main, the third
Detection branch is detected by carrying out surge to the Rectified alternating current to obtain the negative sense surge trigger voltage of the electric main,
Wherein, the positive surge trigger voltage is greater 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 third detection branch, described control unit current surge voltage described in the zero passage interval judgement of the electric main is big
Surge protection is triggered when predetermined reference voltage, and when the electric main is not in zero passage section according to the current surge
Relationship and the current surge voltage and negative sense surge triggering electricity between voltage and the positive surge trigger voltage
Relationship between pressure judges whether to trigger surge protection, when the electric main is not in zero passage section, wherein
If the current surge voltage is greater than the positive surge trigger voltage, described control unit triggers surge protection；
If the current surge voltage is less than the negative sense surge trigger voltage, described control unit triggers surge protection.
2. being used for the surge protection circuit of household appliance as described in claim 1, which is characterized in that the zero passage detection unit
Include:
One end of first resistor, the first resistor passes through concatenated first current-limiting resistance and the second current-limiting resistance and the rectification
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 has first node, described
The other end of second resistance is grounded, and the first node is connected with the zero passage detection end of described control unit；
First capacitor, the first capacitor are in parallel with the second resistance.
3. being used for the surge protection circuit of household appliance as described in claim 1, which is characterized in that first detection branch
Include:
One end of 3rd resistor, the 3rd resistor is connected by third 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 has second node, described
The other end of 4th resistance is grounded, and the second node is connected with the first surge test side of described control unit；
Second capacitor, second capacitor and the 4th resistor coupled in parallel.
4. being used for the surge protection circuit of household appliance as claimed in claim 3, which is characterized in that second detection branch
Include:
One end of 5th resistance, 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 has third node, described
The other end of 6th resistance is grounded, and the third node is connected with the second surge test side of described control unit；
Third capacitor, the third capacitor and the 6th resistor coupled in parallel.
5. being used for the surge protection circuit of household appliance as claimed in claim 4, which is characterized in that the third detection branch
Include:
7th resistance, one end of the 7th resistance one end phase with one end of the 3rd resistor and the 5th resistance respectively
Even；
8th resistance, one end of the 8th resistance is connected with the other end of the 7th resistance and has fourth node, described
The other end of 8th resistance is grounded, and the fourth node is connected with the third surge test side of described control unit；
4th capacitor, the 4th capacitor and the 8th resistor coupled in parallel.
6. being used for the surge protection circuit of household appliance as claimed in claim 5, which is characterized in that the appearance of second capacitor
It is worth capacitance equal with the capacitance of the 4th capacitor, and being greater than the third capacitor.
7. as described in claim 1 be used for household appliance surge protection circuit, which is characterized in that the zero passage section when
Between be less than 2.5ms.
8. a kind of household appliance, which is characterized in that including the wave such as of any of claims 1-7 for household appliance
Gush protection circuit.
9. a kind of surge protection method of household appliance as claimed in claim 8, which comprises the following steps:
Zero passage detection is carried out to obtain the zero passage section of the electric main to the Rectified alternating current；
Surge detection is carried out to obtain the exchange city respectively to the Rectified alternating current by the two-way surge detection unit
The negative sense surge triggering electricity of electric positive surge trigger voltage, the current surge voltage of the electric main and the electric main
Pressure, wherein the forward direction surge trigger voltage is greater than the negative sense surge trigger voltage；
Triggering surge is protected when the current surge voltage described in the zero passage interval judgement of the electric main is greater than predetermined reference voltage
Shield, and when the electric main is not in zero passage section according to the current surge voltage and the positive surge trigger voltage
Between relationship and the current surge voltage and the negative sense surge trigger voltage between relationship judge whether triggering wave
Gush protection, wherein when the electric main is not in zero passage section, wherein
If the current surge voltage is greater than the positive surge trigger voltage, surge protection is triggered；
If the current surge voltage is less than the negative sense surge trigger voltage, surge protection is triggered.
10. the surge protection method of household appliance as claimed in claim 9, which is characterized in that the time in the zero passage section
Less than 2.5ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710210957.2A CN108666994B (en) | 2017-03-31 | 2017-03-31 | Household appliance and the surge protection circuit for household appliance, method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710210957.2A CN108666994B (en) | 2017-03-31 | 2017-03-31 | Household appliance and the surge protection circuit for household appliance, method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108666994A CN108666994A (en) | 2018-10-16 |
| CN108666994B true CN108666994B (en) | 2019-10-29 |
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ID=63784592
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710210957.2A Active CN108666994B (en) | 2017-03-31 | 2017-03-31 | Household appliance and the surge protection circuit for household appliance, method |
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| Country | Link |
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| CN (1) | CN108666994B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201590659U (en) * | 2009-10-25 | 2010-09-22 | 美的集团有限公司 | Surge response protection circuit of induction cooker |
| CN102707121A (en) * | 2012-06-14 | 2012-10-03 | 美的集团有限公司 | Voltage surge detection circuit |
| CN105990824A (en) * | 2015-02-02 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit |
| CN106470507A (en) * | 2015-08-18 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its surge detection means |
-
2017
- 2017-03-31 CN CN201710210957.2A patent/CN108666994B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201590659U (en) * | 2009-10-25 | 2010-09-22 | 美的集团有限公司 | Surge response protection circuit of induction cooker |
| CN102707121A (en) * | 2012-06-14 | 2012-10-03 | 美的集团有限公司 | Voltage surge detection circuit |
| CN105990824A (en) * | 2015-02-02 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit |
| CN106470507A (en) * | 2015-08-18 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its surge detection means |
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| Publication number | Publication date |
|---|---|
| CN108666994A (en) | 2018-10-16 |
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