CN108808642A - Surge protection circuit and electrical equipment - Google Patents
Surge protection circuit and electrical equipment Download PDFInfo
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- CN108808642A CN108808642A CN201710308121.6A CN201710308121A CN108808642A CN 108808642 A CN108808642 A CN 108808642A CN 201710308121 A CN201710308121 A CN 201710308121A CN 108808642 A CN108808642 A CN 108808642A
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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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The present invention discloses a kind of surge protection circuit and electrical equipment, the surge protection circuit include：Positive surge detection circuit, for detecting the positive surging signal in AC power；Negative sense surge detection circuit, for detecting the negative sense surging signal in AC power；Zero cross detection circuit, for detecting AC power zero crossing；Controller, for when receiving the detection signal of positive surge detection circuit/negative sense surge detection circuit output, starting surge protection；Controller is additionally operable to, when zero cross detection circuit exports zero passage detection signal, be not responding to the detection signal of negative sense surge detection circuit output.Surge protection circuit of the present invention realizes the AC power inputted in detection electrical equipment in real time, and can effectively play surge protection function at any time, and avoid electrical equipment complete machine is influenced by surging signal, to ensure electrical equipment the operation is stable.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of surge protection circuit and electrical equipment.
Background technology
With the development of science and technology, the household electrical appliance such as electromagnetic oven, electric cooker are more and more universal in daily life, when an electricity
In net, when the electrical equipment used is more, cause the interference signals such as surge, the clutter in power grid also increasingly severe and frequent hair
It is raw, the performance and used life of household electrical appliance is seriously affected, and there are security risks.
Existing surge protection circuit, which mainly passes through, detects AC power forward direction and negative sense surging signal, and by opening
Dynamic surge protection, realizes the forward direction and negative sense defencive function of electrical equipment.But due to alternating current when alternating current is at zero crossing
Signal is relatively low, may be judged by accident by circuit into negative sense surging signal, accidentally be protected to be susceptible to surge.
Invention content
The main object of the present invention is a kind of surge protection circuit of proposition and electrical equipment, it is intended to which realization detects wave in real time
Signal is gushed, carrying out surge protection efficiency is improved.
To achieve the above object, the present invention proposes a kind of surge protection circuit, for passing through rectifier bridge incoming transport power supply,
The surge protection circuit includes：
Positive surge detection circuit, for detecting the positive surging signal in the AC power；
Negative sense surge detection circuit, for detecting the negative sense surging signal in the AC power；
Zero cross detection circuit, for detecting AC power zero passage section；
Controller, in the detection letter for receiving the positive surge detection circuit/negative sense surge detection circuit output
Number when, start surge protection；The controller is additionally operable to detect that ac supply signal was in the zero cross detection circuit
When zero section, it is not responding to the detection signal of the negative sense surge detection circuit output.
Preferably, the positive surge detection circuit includes the first sampling unit and first comparator, first sampling
The input terminal of unit is connect with the AC power, the positive of the output end and the first comparator of first sampling unit
Input terminal connects；The inverting input of the first comparator for input the first reference voltage, the first comparator it is defeated
Outlet is for exporting positive surging signal.
Preferably, first sampling unit includes first resistor, second resistance and the first capacitance, the first resistor
First end is the input terminal of first sampling unit, and the second end of the first resistor is the output of first sampling unit
End, and interconnected with the first end of the first end of the second resistance and the first resistor；The second end of the second resistance with
The second end of first capacitance is grounded.
Preferably, the negative sense surge detection circuit includes the second sampling unit and the second comparator, second sampling
The connection of the input terminal of unit and the AC power, the output end of second sampling unit and second comparator are just
Phase input terminal connects；The inverting input of second comparator is connect with the output end of first sampling unit, and described
The output end of two comparators is for exporting negative sense surging signal.
Preferably, second sampling unit includes 3rd resistor, the 4th resistance and the second capacitance, the 3rd resistor
First end is the input terminal of second sampling unit, and the second end of the 3rd resistor is the output of second sampling unit
End, and interconnected with the first end of the 4th resistance and the first end of second capacitance；The second end of the 3rd resistor and
The first end of second capacitance is grounded.
Preferably, the capacitance of first capacitance is more than the capacitance of second capacitance.
Preferably, the voltage difference of the normal phase input end of second comparator and inverting input input be 100mv~
500mv。
Preferably, the zero cross detection circuit includes third comparator, the inverting input of the third comparator and institute
The output end connection of the second sampling unit is stated, the normal phase input end of the third comparator is for inputting the second reference voltage, institute
The output end of third comparator is stated for exporting zero passage detection signal.
Preferably, the surge protection circuit further includes rectifier bridge, the input terminal of the rectifier bridge and the AC power
Connection, the output end of the rectifier bridge are interconnected with the positive surge detection circuit and the negative sense surge detection circuit.
Preferably, the first comparator, the second comparator and third comparator are integrated in an integrated chip.
The present invention also proposes a kind of electrical equipment, which includes surge protection circuit as described above, the surge
Protection circuit include：Positive surge detection circuit, for detecting the positive surging signal in the AC power；Negative sense surge is examined
Slowdown monitoring circuit, for detecting the negative sense surging signal in the AC power；Zero cross detection circuit, for detecting the AC power
Zero crossing；Controller, in the detection signal for receiving the positive surge detection circuit/negative sense surge detection circuit output
When, start surge protection；The controller is additionally operable to, when the zero cross detection circuit exports zero passage detection signal, be not responding to institute
State the detection signal of negative sense surge detection circuit output.
Surge protection circuit of the present invention is being detected by the way that positive surge detection circuit/negative sense surge detection circuit is arranged
In the voltage signal of AC power, there are the feedback signals for when positive/negative sense surging signal, exporting variation to controller, controls
Device starts surge protection after receiving feedback signal, influences electrical equipment by the normal of surging signal to avoid surging signal
It uses, meanwhile, when zero cross detection circuit detects AC power in zero passage section, the feedback signal for exporting variation extremely controls
Device, so that controller is not responding to the feedback signal of negative sense surge detection circuit output at this time.In this way, surge protection circuit of the present invention
The AC power inputted in detection electrical equipment in real time is realized, and can effectively play surge protection work(at any time
Can, avoid electrical equipment complete machine is influenced by surging signal, to ensure electrical equipment the operation is stable.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the high-level schematic functional block diagram that surge protection circuit of the present invention is applied in electrical equipment；
Fig. 2 is the electrical block diagram of one embodiment of surge protection circuit in Fig. 1.
Drawing reference numeral explanation：
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in the picture) between each component,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, it is somebody's turn to do " first ", " second " etc.
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.In addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, when the knot that conflicting or cannot achieve when will be understood that this technical solution occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection domain within.
A kind of surge protection circuit proposed by the present invention, the surge protection circuit are suitable for air conditioner, electromagnetic oven, electric cooker
In equal electrical equipments, for passing through rectifier bridge incoming transport power supply, to detect the forward direction in AC power, negative sense surging signal,
When to occur forward direction, negative sense surging signal in the AC power of electrical equipment input, protect electrical equipment complete machine not by wave
The influence of signal is gushed, ensures electrical equipment the operation is stable, and in AC power near zero-crossing point, also referred to as zero passage section, no
The detection signal for responding negative sense surge detection circuit is accidentally protected to avoid surge protection circuit.
It is common, in the power supply circuit of the electrical equipments such as air conditioner, electromagnetic oven, electric cooker, it is both provided with rectifier bridge
200, surge protection circuit of the present invention is directly connected to the output end of rectifier bridge 200.
Referring to FIG. 1 and FIG. 2, in an embodiment of the present invention, which includes：Positive surge detection circuit
10, negative sense surge detection circuit 20, zero cross detection circuit 30 and controller 40.
Wherein, the test side of the positive surge detection circuit 10, the negative sense surge detection circuit 20 test side, with
And the test side of zero cross detection circuit 30 is connect with the output end of the rectifier bridge 200, the forward direction surge detection circuit 10
The output end of output end, the output end of the negative sense surge detection circuit 20 and zero cross detection circuit 30 respectively with the control
Device 40 processed connects.
In the present embodiment, positive surge detection circuit 10 is used to detect the positive surging signal in the AC power 100；
Negative sense surge detection circuit 20 is used to detect negative sense surging signal in the AC power 100, so set, can to avoid by
10 when positive surge can occur in advance in negative sense surge, and protect circuit that positive surge detection circuit is only arranged, it cannot respond to bear
To surging signal, cause protect circuit there are hysteresis qualitys, the problem of can not timely and effectively playing a protective role.Zero passage detection
Circuit 30 is used to detect voltage signal when 100 zero passage section of the AC power, and is detecting voltage signal values at this time
It is zero or when close to zero, the judgement voltage that AC power 100 exports at this time is in zero passage section, and exports feedback signal extremely
Controller 40.Controller 40 is used to receive what the positive 10/ negative sense surge detection circuit 20 of surge detection circuit exported
When detecting signal, output control signal to realize that electrical equipment reduces power, or is believed in positive surging signal, negative sense surge
When number serious, stoppage protection signal is exported, so that electrical equipment is stopped immediately, starts surge protection；The controller 40
It is additionally operable to, when the zero cross detection circuit 30 exports zero passage detection signal, be not responding to the negative sense surge detection circuit 20 and export
Detection signal may be detected by negative sense surge to avoid city electric signal of the AC power 100 at zero crossing section relatively low
Circuit erroneous judgement is accidentally protected at negative sense surging signal.
In the present embodiment, controller 40 may be used realizes it by discrete component composition control circuit or integrated chip
Control function.In the present embodiment, controller 40 is preferably realized using integrated chip MCU so that electrical equipment preferably towards
Micromation, intelligentized direction are developed and are reduced the power consumption of electrical equipment, while saving the space layout of pcb board.
Specifically, when controller 40 receives output end/negative sense surge detection circuit 20 of positive surge detection circuit 10
The feedback signal of output end output when signal overturning occurs, then judge to have in AC power 100 positive surging signal/negative sense wave
Signal is gushed, and exports corresponding control signal, to start surge protection, to avoid electrical equipment complete machine by surging signal
It influences, to ensure electrical equipment the operation is stable.
When controller 40 receive zero cross detection circuit 30 output feedback signal convert when, be not responding to bear at this time
The feedback signal exported to surge detection circuit 20, and the feedback signal that positive surge detection circuit 10 exports is received, in this way,
Zero passage section both can accidentally be protected to avoid negative sense surge detection circuit 20, while receive what positive surge detection circuit 10 exported
Feedback signal, to avoid surge protection circuit from protection blind area occur.
Surge protection circuit of the present invention is being examined by the way that positive 10/ negative sense surge detection circuit 20 of surge detection circuit is arranged
In the voltage signal for measuring AC power 100, there are the feedback signals for when positive/negative sense surging signal, exporting variation extremely to control
Device 40, controller 40 start surge protection after receiving feedback signal, influence electrical equipment by surge to avoid surging signal
The normal use of signal, meanwhile, when zero cross detection circuit 30 detects AC power 100 in zero passage section, export variation
Feedback signal is to controller 40, so that controller 40 is not responding to the feedback signal that negative sense surge detection circuit 20 exports at this time.This
Sample, surge protection circuit of the present invention realize the AC power 100 inputted in detection electrical equipment in real time, and at any time all
Surge protection function can be effectively played, avoid electrical equipment complete machine is influenced by surging signal, to ensure electrical equipment
The operation is stable.
In a preferred embodiment, the positive surge detection circuit 10 includes the first sampling unit 11 and first comparator
The input terminal of U1, first sampling unit 11 are connect with the AC power 100, the output end of first sampling unit 11
It is connect with the normal phase input end of the first comparator U1；The inverting input of the first comparator U1 is for inputting the first ginseng
Voltage is examined, the output end of the first comparator U1 is for exporting positive surging signal.
In the present embodiment, the first sampling unit 11 is sampled the AC power 100 of access, and exports corresponding first
Sampled signal.Discrete component composition comparison circuit may be used in first comparator U1, can also be realized using integrated chip
Signal comparing function.In the present embodiment, first comparator U1 preferably uses integrated chip to realize.First reference voltage can pass through volume
Cheng Jinhang configuration selections, configure rational reference voltage, to realize that voltage signal in AC power 100 is normal namely does not occur
When surging signal, the first reference voltage level is more than the sampled signal of normal phase input end input.
Specifically, when the voltage value that AC power 100 exports is normal, i.e., when not occurring surging signal, first with reference to electricity
Pressure is more than the first sampled signal, and first comparator U1 exports low level；It is positive unrestrained when occurring in the voltage that AC power 100 exports
When gushing signal, the first reference voltage is less than the first sampled signal, and first comparator U1 exports high level and realizes signal and overturn.
Further, in above-described embodiment, first sampling unit 11 includes first resistor R1, second resistance R2 and the
The first end of one capacitance C1, the first resistor R1 is the input terminal of first sampling unit 11, the first resistor R1's
Second end be first sampling unit 11 output end, and with the first end of the second resistance R2 and the first resistor R1
First end interconnection；The second end of the second resistance R2 and the second end of the first capacitance C1 are grounded.
In the present embodiment, first resistor R1 and second resistance R2 are divided by connecting, by the voltage of rectification circuit output into
Row partial pressure is the sampling of the first sampling unit 11 to realize the output of detection signal, the voltage value got on first resistor R1
Signal can also adjust first resistor R1 and second resistance R2's by adjusting the resistance value of first resistor R1 and/or second resistance R2
Intrinsic standoff ratio, and then adjust the output of the first sampled signal.First capacitance C1 is for filtering out the direct current after rectified circuit rectifies
Alternating component in source；According to the frequency-selecting of the first capacitance C1, filtering characteristic, the capacity by adjusting the first capacitance C1 can also be adjusted
Sensitivity of the whole surge protection circuit to surging signal.
In a preferred embodiment, the negative sense surge detection circuit 20 includes the second sampling unit 21 and the second comparator
U2, the connection of the input terminal and the AC power 100 of second sampling unit 21, the output of second sampling unit 21
End is connect with the normal phase input end of the second comparator U2；The inverting input of the second comparator U2 takes with described first
The output end of sample unit 11 connects, and the output end of the second comparator U2 is for exporting negative sense surging signal.
In the present embodiment, the second sampling unit 21 is sampled the AC power 100 of access, and exports corresponding second
Sampled signal.Discrete component composition comparison circuit may be used in second comparator U2, can also be realized using integrated chip
Signal comparing function.In the present embodiment, the second comparator U2 preferably uses integrated chip to realize.
Specifically, when the voltage value that AC power 100 exports is normal, i.e., when not occurring surging signal, the second sampling letter
Number it is more than the first sampled signal, the second comparator U2 exports high level；It is unrestrained when occurring negative sense in the voltage that AC power 100 exports
When gushing signal, the second sampled signal is less than the first sampled signal, and the second comparator U2 exports low level and realizes signal and overturn.
Further, in above-described embodiment, second sampling unit 21 includes 3rd resistor R3, the 4th resistance R4 and the
The first end of two capacitance C2, the 3rd resistor R3 is the input terminal of second sampling unit 21, the 3rd resistor R3's
Second end be second sampling unit 21 output end, and with the first end of the 4th resistance R4 and the second capacitance C2
First end interconnection；The second end of the 3rd resistor R3 and the first end of the second capacitance C2 are grounded.
In the present embodiment, 3rd resistor R3 and the 4th resistance R4 are divided by connecting, by the voltage of rectification circuit output into
Row partial pressure is as the second sampling unit 21 to realize the output of detection signal, the voltage value got on 3rd resistor R3
Sampled signal can also adjust 3rd resistor R3 and the described 4th by adjusting the resistance value of 3rd resistor R3 and/or the 4th resistance R4
The intrinsic standoff ratio of resistance R4, and then adjust the output of the second sampled signal.Second capacitance C2 is for after filtering out rectified circuit rectifies
DC power supply in alternating component；According to the frequency-selecting of the second capacitance C2, filtering characteristic, by the capacity for adjusting the second capacitance C2
Sensitivity of the positive surge detection circuit 10 to surging signal can also be adjusted.
Further, in above-described embodiment, the capacitance of the first capacitance C1 is more than the capacitance of the second capacitance C2.
In the present embodiment, the capacitance of the first capacitance C1 is more than the capacitance of the second capacitance C2, to realize in AC power 100
When there is negative sense surging signal, the first capacitance C1 and the second capacitance C2 make the second capacitance C2 meetings due to filtering, selecting frequency characteristic
Prior to the first capacitance C1 actions, and then realize that the first sampled signal is more than the second sampled signal, so set, may be implemented handing over
When occurring negative sense surging signal in galvanic electricity source 100, the level of the inverting input of the second comparator U2 is higher than positive input
Level, and then the second comparator U2 exports low level, to realize that signal is overturn.
Further, the voltage difference that the normal phase input end of the second comparator U2 is inputted with inverting input is
100mv~500mv.
In the present embodiment, in order to ensure when the voltage value that AC power 100 exports is normal, i.e., do not occur surging signal
When, the second comparator U2 exports high level, and the voltage division signal of the normal phase input end input of second comparator can be higher than reverse phase
The voltage division signal of input terminal input, general difference are 100mv~500mv.
In a preferred embodiment, the zero cross detection circuit 30 includes third comparator U3, the third comparator U3
Inverting input connect with the output end of second sampling unit 21, the normal phase input end of the third comparator U3 is used for
The second reference voltage is inputted, the output end of the third comparator U3 is for exporting zero passage detection signal.
In the present embodiment, the discrete components such as triode, optocoupler may be used to realize that zero passage is examined in zero cross detection circuit 30
It surveys, can also realize that zero passage detection, the present embodiment preferably use comparator using the comparator being made of integrated chip.Second
Reference voltage may be configured as being more than 0V or the voltage value close to 0V, so that the inverting input of third comparator U3 is connecing
It when receiving the second sampled signal, is compared with the second reference voltage of normal phase input end input, in this way, working as third comparator U3
The voltage value of the second sampled signal of inverting input input be 0V or when close to 0V, then judge alternating current at this time
The voltage that source 100 exports is in zero passage section, and realizes that signal is overturn.
Specifically, when the voltage value that AC power 100 exports is in non-zero passage section, the second reference voltage takes less than second
Sample signal, third comparator U3 export low level；When the voltage value that AC power 100 exports is in zero passage section, the second reference
Voltage is more than the second sampled signal, and third comparator U3 exports high level and realizes that signal is overturn, so set, in AC power
Second reference voltage in 100 voltage signal zero passage section, the normal phase input end input of third comparator U3 is more than anti-phase input
Hold input the second sampled signal, the defeated low and high levels of third comparator U3 and realize signal overturn so that controller 40 is detecting
To third comparator U3 output energizing signal when, the feedback signal of the second comparator U2 outputs at this time is not responding to, to avoid
Due at zero passage section, the first sampled signal of second comparator U2 inverting input input and normal phase input end input
Second sampled signal relatively leads to the second comparator U2 malfunctions.
Further, with reference to Fig. 2, in above-described embodiment, first comparator U1, the second comparator U2 and third comparator U3
It is internal that an integrated chip (figure does not indicate) can be integrated in, to save the space layout of production cost and pcb board.Above-mentioned first ginseng
Configuration selection can be carried out by the way that controller 40 is programmed by examining voltage and the second reference voltage, configure rational reference voltage, certainly,
In other embodiments, the first reference voltage and the second reference voltage can also be by forming partial pressure by discrete components such as resistance
Circuit carries out configuration selection, is not limited herein.
Thought in order to better illustrate the present invention carries out the concrete principle of circuit of the present invention below in conjunction with Fig. 1 and Fig. 2
It illustrates：
Such as attached drawing 1 and Fig. 2, when electrical equipment works on power, the AC power 100 of input is converted to direct current by rectifier bridge 50
Power supply is simultaneously exported to by resistance R1, R2 and the first capacitance C1 the first sampling unit 11 formed and by resistance R3, R4 and second
Second sampling unit 21 of capacitance C2 compositions.After first sampling unit 11 and the second sampling unit 21 are sampled DC power supply
It is exported respectively to first comparator U1, the second comparator U2 and third comparator U3.
First comparator U1：It is exported under normal circumstances in AC power 100, i.e., when not occurring surging signal, the first reference
Voltage is more than the first sampled signal, and first comparator U1 exports low level at this time；Occur when in the voltage that AC power 100 exports
When positive surging signal, the first reference voltage is less than the first sampled signal, and first comparator U1 exports high level and realizes signal
Overturning, and export to controller 40, controller 40 exports shutdown control signal, to avoid electricity when receiving the energizing signal
Device equipment is damaged due to by the impact of positive surging signal.
Second comparator U2：It is exported under normal circumstances in AC power 100, i.e., when not occurring surging signal, the second sampling
Signal is more than the first sampled signal, that is to say, that and the partial pressure value of first resistor R1 is more than the partial pressure value of 3rd resistor R3, at this point,
Second comparator U2 exports high level；When there is negative sense surging signal in the voltage that AC power 100 exports, due to the first electricity
The capacity for holding C1 is more than the capacity of the second capacitance C2, and the second capacitance C2 can be prior to the first capacitance C1 actions so that the second sampling letter
Number be less than the first sampled signal, the second comparator U2 output low level and realize that signal is overturn, and export to controller 40, control
Device 40 exports shutdown control signal, to avoid electrical equipment because by negative sense surging signal when receiving the energizing signal
It impacts and damages.
Third comparator U3：When the voltage value that AC power 100 exports is in non-zero passage section, the second reference voltage is less than
Second sampled signal, third comparator U3 export low level；When the voltage value that AC power 100 exports is in zero passage section, this
When the second reference voltage be more than the second sampled signal, third comparator U3 output high level and realize that signal is overturn, and export extremely
Controller 40, controller 40 are not responding to the feedback signal of the second comparator U2 outputs at this time when receiving the energizing signal, with
It avoids due to the first sampled signal at this time and the second sampled signal relatively namely the partial pressure value of first resistor R1 and third electricity
The partial pressure value for hindering R3 relatively, so that the second comparator U2 erroneous judgements, and realizes that signal is overturn, causes controller 40 defeated
Go out shutdown control signal, and surge protection circuit is caused to malfunction, at this time since first comparator U1 is still being worked normally, therefore
Positive surge detection circuit 10 still can effectively detect positive surging signal, avoid surge protection circuit and go out in zero passage section
Existing surge protection blind area.
By equipment to first comparator U1, the second comparator U2, detection is taken surge protection circuit of the present invention by first in real time
The sampled signal of sample unit 11 and the output of the second sampling unit 21, and occur in detecting sampled signal positive/negative to surge believing
Number when, realize signal overturning, and export to controller 40 so that controller 40 is when receiving the energizing signal, output control
Signal to damaging electrical equipment due to the impact of surging signal, while being arranged third and comparing to avoid electrical equipment because by positive/negative
Device U3 realizes signal overturning, and export to controller 40 when the voltage value that AC power 100 exports is in zero passage section, so that
Controller 40 is not responding to the feedback signal of the second comparator U2 output at this time when receiving the energizing signal, due at this time the
One comparator U1 is still being worked normally, therefore positive surge detection circuit 10 still can effectively detect positive surging signal, keep away
Exempt from surge protection circuit and surge protection blind area occurs in zero passage section.In this way, surge protection circuit of the present invention realizes in real time
The AC power 100 inputted in detection electrical equipment, and surge protection function can be effectively played at any time, it avoids
Electrical equipment complete machine is influenced by surging signal, to ensure electrical equipment the operation is stable.
The present invention also proposes a kind of electrical equipment, which includes surge protection circuit, the surge protection circuit
Concrete structure is with reference to above-described embodiment, since this electrical equipment uses whole skills of all embodiments of above-mentioned surge protection circuit
Art scheme, therefore at least all advantageous effects caused by the technical solution with above-mentioned surge protection circuit embodiment, herein
No longer repeat one by one.
In the present embodiment, electrical equipment can be the domestic electric appliances such as electromagnetic oven, electric cooker.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
In the scope of patent protection that other related technical areas are included in the present invention.
Claims (10)
1. a kind of surge protection circuit, for passing through rectifier bridge (200) incoming transport power supply (100), which is characterized in that the wave
Gushing protection circuit includes：
Positive surge detection circuit (10), for detecting the positive surging signal in the AC power (100)；
Negative sense surge detection circuit (20), for detecting the negative sense surging signal in the AC power (100)；
Zero cross detection circuit (30), for detecting the AC power (100) zero passage section；
Controller (40), for receiving the positive surge detection circuit (10)/negative sense surge detection circuit (20) output
Detection signal when, start surge protection；The controller (40) is additionally operable to detect friendship in the zero cross detection circuit (30)
When galvanic electricity source (100) signal is in zero passage section, it is not responding to the detection signal of negative sense surge detection circuit (20) output.
2. surge protection circuit as described in claim 1, which is characterized in that the forward direction surge detection circuit (10) includes the
One sampling unit (11) and first comparator (U1), input terminal and the AC power of first sampling unit (11)
(100) it connects, the output end of first sampling unit (11) is connect with the normal phase input end of the first comparator (U1)；Institute
The inverting input for stating first comparator (U1) is used for inputting the first reference voltage, the output end of the first comparator (U1)
In the positive surging signal of output.
3. surge protection circuit as claimed in claim 2, which is characterized in that first sampling unit (11) includes the first electricity
(R1), second resistance (R2) and the first capacitance (C1) are hindered, the first end of the first resistor (R1) is first sampling unit
(11) input terminal, the second end of the first resistor (R1) are the output end of first sampling unit (11), and with it is described
The first end interconnection of the first end and the first resistor (R1) of second resistance (R2)；The second end of the second resistance (R2) with
The second end of first capacitance (C1) is grounded.
4. surge protection circuit as claimed in claim 3, which is characterized in that the negative sense surge detection circuit (20) includes the
Two sampling units (21) and the second comparator (U2), input terminal and the AC power of second sampling unit (21)
(100) connection, the output end of second sampling unit (21) are connect with the normal phase input end of second comparator (U2)；
The inverting input of second comparator (U2) is connect with the output end of first sampling unit (11), and described second compares
The output end of device (U2) is for exporting negative sense surging signal.
5. surge protection circuit as claimed in claim 4, which is characterized in that second sampling unit (21) includes third electricity
(R3), the 4th resistance (R4) and the second capacitance (C2) are hindered, the first end of the 3rd resistor (R3) is second sampling unit
(21) input terminal, the second end of the 3rd resistor (R3) are the output end of second sampling unit (21), and with it is described
The first end of 4th resistance (R4) and the first end interconnection of second capacitance (C2)；The second end of the 3rd resistor (R3) and
The first end of second capacitance (C2) is grounded.
6. surge protection circuit as claimed in claim 5, which is characterized in that the capacitance of first capacitance (C1) is more than described
The capacitance of second capacitance (C2).
7. surge protection circuit as claimed in claim 4, which is characterized in that the normal phase input end of second comparator with it is anti-
The voltage difference of phase input terminal input is 100mv~500mv.
8. surge protection circuit as claimed in claim 4, which is characterized in that the zero cross detection circuit (30) includes third ratio
Compared with device (U3), the inverting input of the third comparator (U3) is connect with the output end of second sampling unit (21), institute
The normal phase input end for stating third comparator (U3) is used for inputting the second reference voltage, the output end of the third comparator (U3)
In output zero passage detection signal.
9. surge protection circuit as claimed in claim 7, which is characterized in that the first comparator (U1), the second comparator
(U2) and third comparator (U3) is integrated in an integrated chip.
10. a kind of electrical equipment, which is characterized in that include the surge protection circuit as described in claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710308121.6A CN108808642A (en) | 2017-05-03 | 2017-05-03 | Surge protection circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710308121.6A CN108808642A (en) | 2017-05-03 | 2017-05-03 | Surge protection circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108808642A true CN108808642A (en) | 2018-11-13 |
Family
ID=64054595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710308121.6A Pending CN108808642A (en) | 2017-05-03 | 2017-05-03 | Surge protection circuit and electrical equipment |
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| Country | Link |
|---|---|
| CN (1) | CN108808642A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687133A (en) * | 2021-08-19 | 2021-11-23 | 华为技术有限公司 | Surge detection circuit and detection device for active protection |
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|---|---|---|---|---|
| WO2007064062A1 (en) * | 2005-11-29 | 2007-06-07 | Dastek Co., Ltd. | Apparatus for protecting surge and over voltage |
| CN101699689A (en) * | 2009-10-25 | 2010-04-28 | 美的集团有限公司 | Surge response protection circuit of induction cooker |
| 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 |
| CN206697930U (en) * | 2017-05-03 | 2017-12-01 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit and electric equipment |
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2017
- 2017-05-03 CN CN201710308121.6A patent/CN108808642A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007064062A1 (en) * | 2005-11-29 | 2007-06-07 | Dastek Co., Ltd. | Apparatus for protecting surge and over voltage |
| CN101699689A (en) * | 2009-10-25 | 2010-04-28 | 美的集团有限公司 | Surge response protection circuit of induction cooker |
| 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 |
| CN206697930U (en) * | 2017-05-03 | 2017-12-01 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit and electric equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113687133A (en) * | 2021-08-19 | 2021-11-23 | 华为技术有限公司 | Surge detection circuit and detection device for active protection |
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