CN105990824B - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
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- CN105990824B CN105990824B CN201510054340.7A CN201510054340A CN105990824B CN 105990824 B CN105990824 B CN 105990824B CN 201510054340 A CN201510054340 A CN 201510054340A CN 105990824 B CN105990824 B CN 105990824B
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Abstract
Include the first bleeder circuit being made of resistance and capacitance, the rectification circuit for carrying out rectification to alternating current, the control circuit for carrying out surge protection the invention discloses a kind of surge protection circuit；Control circuit includes first comparator；The input terminal of first bleeder circuit and the output end of rectification circuit connect, and the output end of the first bleeder circuit and the first input end of first comparator connect；Second input terminal of first comparator is connect with the first preset reference power supply, and when alternating current is in the state that voltage is less than the first preset value, when there is positive surge, the voltage of the output end of first bleeder circuit is more than the voltage of the first reference power supply, when there is no positive surge, the voltage of the output end of the first bleeder circuit is less than the voltage of the first reference power supply；Control circuit carries out surge protection control according to the state of the first comparator output end output level.The present invention improves the safety of power supply.
Description
Technical field
The present invention relates to home wiring control technical field more particularly to surge protection circuits.
Background technology
It is well known that the surge detection used in the prior art is typically that sampling multiple bleeder circuit is divided, according to
The size of voltage carries out surge protection in each bleeder circuit.Since the voltage of alternating current each bleeder circuit near zero crossing is big
It is small almost the same, the maloperation of surge protection occurs in zero crossing in order to prevent, it usually needs detection zero passage point moment, and shield
Surge protection at this time.Due to being detected without surge near zero-crossing point, so that the safety of power supply is relatively low.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
Invention content
The main purpose of the present invention is to provide a kind of surge protection circuits, it is intended to improve the safety of power supply.
To achieve the goals above, the present invention provides a kind of surge protection circuit, and the surge protection circuit includes by electricity
First bleeder circuit of resistance and capacitance composition, the rectification circuit for carrying out rectification to alternating current, the control for carrying out surge protection
Circuit processed；The control circuit includes first comparator；
The input terminal of first bleeder circuit is connect with the output end of the rectification circuit, first bleeder circuit
Output end is connect with the first input end of the first comparator；Second input terminal of the first comparator and preset first
Reference power supply connects, and works as alternating current in the state that voltage is less than the first preset value, and when there is positive surge, the first partial pressure is electric
The voltage of the output end on road is more than the voltage of the first reference power supply, when there is no positive surge, the output of the first bleeder circuit
The voltage at end is less than the voltage of the first reference power supply；Control circuit is according to the state of the first comparator output end output level
Carry out surge protection control.
Preferably, first bleeder circuit includes first resistor, second resistance and the first capacitance, the first resistor
One end is connect with the output end of the rectification circuit, and the other end is connect by the second resistance with ground terminal；First electricity
Hold the both ends for being parallel to the second resistance；The first input end of the first comparator is connected to the first resistor and second
The common end of resistance.
Preferably, the surge protection circuit further includes that the second bleeder circuit being made of resistance and capacitance and third divide
Circuit, the control circuit further include the second comparator and third comparator；
The input terminal of second bleeder circuit is connect with the output end of the rectification circuit, second bleeder circuit
Output end is connect with the first input end of second comparator, the second input terminal of second comparator with described first point
The output end of volt circuit connects；And when positive surge voltage is not present in the alternating current, the output end of first bleeder circuit
Voltage be more than second bleeder circuit output end voltage；When there is positive surge voltage in the alternating current, described the
The voltage of the output end of one bleeder circuit is less than the voltage of the output end of second bleeder circuit；
The input terminal of the third bleeder circuit is connect with the output end of the rectification circuit, the third bleeder circuit
Output end is connect with the first input end of the third comparator, the second input terminal of the third comparator and preset second
Reference power supply connects, the zero crossing for detecting the alternating current, and when the output end voltage of the third bleeder circuit is less than the
When two preset values, the output end for controlling second comparator exports preset level signal.
Preferably, second bleeder circuit includes 3rd resistor, the 4th resistance and the second capacitance, the 3rd resistor
One end is connect with the output end of the rectification circuit, and the other end is connect by the 4th resistance with ground terminal；Second electricity
Hold the both ends for being parallel to the 4th resistance；The first input end of second comparator is connected to the 3rd resistor and the 4th
The common end of resistance.
Preferably, the third bleeder circuit includes the 5th resistance, the 6th resistance, the 7th resistance, third capacitance and the 4th
One end of capacitance, the 5th resistance is connect with the output end of the rectification circuit, and the other end passes through the 6th resistance and
Seven resistance are connect after being sequentially connected in series with ground terminal；The third capacitance is parallel to the both ends of the 5th resistance；4th electricity
Hold the both ends for being parallel to the 7th resistance；The first input end of the third comparator is connected to the 6th resistance and the 7th
The common end of resistance.
Preferably, the surge protection circuit further includes the 4th bleeder circuit being made of resistance and capacitance, the control
Circuit further includes the 4th comparator；
The input terminal of 4th bleeder circuit is connect with the output end of the rectification circuit, the 4th bleeder circuit
Output end is connect with the first input end of the 4th comparator, the second input terminal of the 4th comparator with described second point
The output end of volt circuit connects；And when negative sense surge voltage is not present in the alternating current, the output end of the 4th bleeder circuit
Voltage be less than second bleeder circuit output end voltage；When the alternating current is there are when negative sense surge voltage, described
The voltage of the output end of four bleeder circuits is more than the voltage of the output end of second bleeder circuit；
The third comparator is additionally operable to when the output end voltage of the third bleeder circuit is less than the second preset value, control
Make the output end output preset level signal of the 4th comparator.
Preferably, the 4th bleeder circuit includes the 8th resistance, the 9th resistance and the 5th capacitance, the 8th resistance
One end is connect with the output end of the rectification circuit, and the other end is connect by the 9th resistance with ground terminal；5th electricity
Hold the both ends for being parallel to the 9th resistance；The first input end of 4th comparator is connected to the 8th resistance and the 9th
The common end of resistance.
Preferably, the rectification circuit include the first diode and the second diode, the anode of first diode with
First ac input end of the alternating current connects, and second diode is connect with the second ac input end of the alternating current, institute
The cathode for stating the first diode is connect with the cathode of second diode.
After the embodiment of the present invention is by being arranged rectification circuit to alternating current progress rectification, divided by the first bleeder circuit,
And be compared the voltage after partial pressure with the first normal voltage, it determines according to the result of the comparison in alternating current close to zero crossing time section
Surge protection is carried out by control circuit when there is positive surge voltage with the presence or absence of positive surge voltage.Due to of the invention real
Alternating current is showed close to the surge detection in zero crossing time section, to prevent in alternating current zero crossing since there are the damages of surge phenomenon
Electrical equipment, therefore improve the safety of power supply.
Description of the drawings
Fig. 1 is the electrical block diagram of one embodiment of surge protection circuit of the present invention.
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
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of surge protection circuit, referring to Fig.1, in one embodiment, the surge protection circuit include by
Resistance and capacitance composition the first bleeder circuit 10, for alternating current carry out rectification rectification circuit 20, for carrying out surge guarantor
The control circuit 30 of shield；The control circuit 30 includes first comparator 31；
The input terminal of first bleeder circuit 10 is connect with the output end of the rectification circuit 20, the first partial pressure electricity
The output end on road 10 is connect with the first input end of the first comparator 31；Second input terminal of the first comparator 31 with
Preset the first reference power supply connection, and work as alternating current in the state that voltage is less than the first preset value, when there is positive surge,
The voltage of the output end of first bleeder circuit 10 is more than the voltage of the first reference power supply, when there is no positive surge, first point
The voltage of the output end of volt circuit 10 is less than the voltage of the first reference power supply；Control circuit 30 is defeated according to the first comparator 31
The state of outlet output level carries out surge protection control.
In the present embodiment, the first input end of above-mentioned first comparator 31 can be in-phase input end, or reverse phase
Input terminal, can specifically be configured according to actual needs, not do further limiting herein.Above-mentioned the first preset standard electric
The voltage swing in source can be configured according to actual needs, and in the present embodiment, preferably the voltage of the first reference power supply is+5V.
Specifically, during the work time, when voltage is less than the first preset value (i.e. close to zero passage to the alternating current in this state
Point) when, if being generated without positive surge voltage, the voltage of the output end of the first bleeder circuit 10 is less than first reference power supply
Voltage, first comparator 31 will export the first level signal；If there are surge peak voltages at this time, in surge peak voltage
When arrival, the output end of first comparator 31 will export a turnover voltage and obtain second electrical level signal, and control circuit 30 is by basis
The second electrical level signal carries out surge protection operation.
After the embodiment of the present invention is by being arranged rectification circuit 20 to alternating current progress rectification, divided by the first bleeder circuit 10
Pressure, and the voltage after partial pressure is compared with the first normal voltage, it determines according to the result of the comparison when alternating current is close to zero
Between section whether there is positive surge voltage, when there is positive surge voltage, surge protection is carried out by control circuit 30.Due to this
Invention realizes alternating current close to the surge detection in zero crossing time section, to prevent in alternating current zero crossing since there are surges to show
As damaging electrical equipment, therefore improve the safety of power supply.
Specifically, above-mentioned first bleeder circuit 10 includes first resistor R1, second resistance R2 and the first capacitance C1, and described the
One end of one resistance R1 is connect with the output end of the rectification circuit 20, and the other end is connected by the second resistance R2 and ground terminal
It connects；The first capacitance C1 is parallel to the both ends of the second resistance R2；The first input end of the first comparator 31 connects
To the common end of the first resistor R1 and second resistance R2.
It is understood that above-mentioned first resistor R1 and second resistance R2 can be a resistance or be concatenated by multiple resistance
It is formed, requires to realize corresponding intrinsic standoff ratio as long as meeting corresponding resistance value.
Further, it is based on above-described embodiment, in the present embodiment, above-mentioned surge protection circuit further includes by resistance and capacitance
The second bleeder circuit 40 and third bleeder circuit 50, the control circuit 30 of composition further include the second comparator 32 and third ratio
Compared with device 33；
The input terminal of second bleeder circuit 40 is connect with the output end of the rectification circuit 20, the second partial pressure electricity
The output end on road 40 is connect with the first input end of second comparator 32, the second input terminal of second comparator 32 with
The output end of first bleeder circuit 10 connects；And when positive surge voltage is not present in the alternating current, first partial pressure
The voltage of the output end of circuit 10 is more than the voltage of the output end of second bleeder circuit 40；When the alternating current has positive wave
When gushing voltage, the voltage of the output end of first bleeder circuit 10 is less than the electricity of the output end of second bleeder circuit 40
Pressure；
The input terminal of the third bleeder circuit 50 is connect with the output end of the rectification circuit 20, the third partial pressure electricity
The output end on road 50 is connect with the first input end of the third comparator 33, the second input terminal of the third comparator 33 with
Preset the second reference power supply connection, the zero crossing for detecting the alternating current, and when the output of the third bleeder circuit 33
When terminal voltage is less than the second preset value, the output end for controlling second comparator 32 exports preset level signal.
It is real by the voltage of above-mentioned second bleeder circuit 40 compared with the voltage of the first bleeder circuit 10 in the present embodiment
Surge detection in present alternating current.Further, bleeder circuit can also be set and realize that bearing surge detects.
Specifically, above-mentioned surge protection circuit further includes the 4th bleeder circuit 60 being made of resistance and capacitance, the control
Circuit 30 processed further includes the 4th comparator 34；
The input terminal of 4th bleeder circuit 60 is connect with the output end of the rectification circuit 20, the 4th partial pressure electricity
The output end on road 60 is connect with the first input end of the 4th comparator 34, the second input terminal of the 4th comparator 34 with
The output end of second bleeder circuit 40 connects；And when negative sense surge voltage is not present in the alternating current, the 4th partial pressure
The voltage of the output end of circuit 60 is less than the voltage of the output end of second bleeder circuit 40；When there are negative sense waves for the alternating current
When gushing voltage, the voltage of the output end of the 4th bleeder circuit 60 is more than the electricity of the output end of second bleeder circuit 40
Pressure；
The third comparator 33 is additionally operable to be less than the second preset value when the output end voltage of the third bleeder circuit 50
When, the output end for controlling the 4th comparator 34 exports preset level signal.
In the present embodiment, above-mentioned third bleeder circuit 50 is for realizing zero passage detection, specifically, when third bleeder circuit 50
When the voltage of output end is more than above-mentioned second preset value, the output end of third comparator 33 exports a level signal, when third point
When the voltage of 50 output end of volt circuit is less than above-mentioned second preset value, then the output end output switching activity level of third comparator 33 is believed
Number.Control circuit 30 will export pre- according to above-mentioned second comparator, 32 and the 4th comparator 34 of the trigging signal signal shielding at this time
Level signal is set, to prevent the first bleeder circuit 10, the second bleeder circuit 40 and the 4th bleeder circuit 60 in alternating current close to zero
When point, the output voltage of the first bleeder circuit 10, the second bleeder circuit 40 and the 4th bleeder circuit 60 more closely causes second to compare
Device 32 and the 4th comparator 34 accidentally export, therefore improve the stability of power supply.
Specifically, above-mentioned second bleeder circuit 40 includes 3rd resistor R3, the 4th resistance R4 and the second capacitance C2, and described the
One end of three resistance R3 is connect with the output end of the rectification circuit 20, and the other end is connected by the 4th resistance R4 and ground terminal
It connects；The second capacitance C2 is parallel to the both ends of the 4th resistance R4；The first input end of second comparator 32 connects
To the common end of the 3rd resistor R3 and the 4th resistance R4.
Above-mentioned third bleeder circuit 50 includes the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, third capacitance C3 and the
Four capacitance C4, one end of the 5th resistance R5 are connect with the output end of the rectification circuit 20, and the other end passes through the described 6th
Resistance R6 and the 7th resistance R7 is connect after being sequentially connected in series with ground terminal；The third capacitance C3 is parallel to the 5th resistance R5's
Both ends；The 4th capacitance C4 is parallel to the both ends of the 7th resistance R7；The first input end of the third comparator 33 connects
It is connected to the common end of the 6th the resistance R6 and the 7th resistance R7.
Above-mentioned 4th bleeder circuit 60 includes the 8th resistance R8, the 9th resistance R9 and the 5th capacitance C5, the 8th resistance
One end of R8 is connect with the output end of the rectification circuit 20, and the other end is connect by the 9th resistance R9 with ground terminal；Institute
State the both ends that the 5th capacitance C5 is parallel to the 9th resistance R9；The first input end of 4th comparator 34 is connected to described
The common end of 8th resistance R8 and the 9th resistance R9.
It should be noted that above-mentioned 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the electricity of the 6th resistance R6 and the 7th
It can be a resistance to hinder R7, can also be sequentially connected in series by multiple resistance.Above-mentioned first capacitance C1, the second capacitance C2 and
The size of 5th capacitance C5 can be configured according to actual needs, in the present embodiment, it is preferable that the capacitance of above-mentioned first capacitance C1
Capacitance of the amount equal to the 5th capacitance C5.And first capacitance C1 capacitance be more than the second capacitance C2 capacitance.
It is understood that right in order to reduce the first bleeder circuit 10, the second bleeder circuit 40 and the 4th bleeder circuit 60
The demand of electric resistance partial pressure, can the first bleeder circuit 10, the second bleeder circuit 40 and the 4th bleeder circuit 60 input terminal with
The divider resistance R of common divided voltage is directly arranged in the output end of rectification circuit 20, after once dividing, then respectively by the first partial pressure
Circuit 10, the second bleeder circuit 40 and the 4th bleeder circuit 60 carry out second divided voltage.
It should be noted that the circuit structure of above-mentioned rectification circuit 20 can be according to actual needs configured including first
Diode D1 and the second diode D2, the anode of the first diode D1 are connect with the first ac input end of the alternating current,
The second diode D2 is connect with the second ac input end of the alternating current, the cathode of the first diode D1 and described the
The cathode of two diode D2 connects.
In the present embodiment, above-mentioned first ac input end can be L line ends, then the second ac input end is N line ends；First
Ac input end can also be N line ends, then the second ac input end is L line ends.The present embodiment is by using the first diode D1
Full-wave rectification is carried out to alternating current with the second diode D2, positive surge detection and the detection of negative surge may be implemented.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. a kind of surge protection circuit, which is characterized in that include that the first bleeder circuit being made of resistance and capacitance and third are divided
Volt circuit, the rectification circuit for carrying out rectification to alternating current, the control circuit for carrying out surge protection；The control circuit packet
Include first comparator and third comparator；
The input terminal of first bleeder circuit is connect with the output end of the rectification circuit, the output of first bleeder circuit
End is connect with the first input end of the first comparator；Second input terminal of the first comparator and the first preset standard
Power supply connects, and works as the alternating current in the state that voltage is less than the first preset value, when there is positive surge, described first point
The voltage of the output end of volt circuit is more than the voltage of first reference power supply, when there is no positive surge, described first point
The voltage of the output end of volt circuit is less than the voltage of first reference power supply；The control circuit is according to the first comparator
The state of output end output level carries out surge protection control；
The input terminal of the third bleeder circuit is connect with the output end of the rectification circuit, the output of the third bleeder circuit
End is connect with the first input end of the third comparator, the second input terminal of the third comparator and the second preset standard
Power supply connects, the zero crossing for detecting the alternating current, and when the output end voltage of the third bleeder circuit is less than second in advance
If when value, controlling the output end output preset level signal of the second comparator of the control circuit.
2. surge protection circuit as described in claim 1, which is characterized in that first bleeder circuit include first resistor,
Second resistance and the first capacitance, one end of the first resistor are connect with the output end of the rectification circuit, and the other end passes through institute
Second resistance is stated to connect with ground terminal；First capacitance is parallel to the both ends of the second resistance；The first comparator
First input end is connected to the common end of the first resistor and second resistance.
3. surge protection circuit as described in claim 1, which is characterized in that the surge protection circuit further include by resistance and
Second bleeder circuit of capacitance composition, the control circuit further includes the second comparator；
The input terminal of second bleeder circuit is connect with the output end of the rectification circuit, the output of second bleeder circuit
End is connect with the first input end of second comparator, the second input terminal of second comparator and the first partial pressure electricity
The output end on road connects；And when positive surge voltage is not present in the alternating current, the electricity of the output end of first bleeder circuit
Voltage of the pressure more than the output end of second bleeder circuit；When there is positive surge voltage in the alternating current, described first point
The voltage of the output end of volt circuit is less than the voltage of the output end of second bleeder circuit.
4. surge protection circuit as claimed in claim 3, which is characterized in that second bleeder circuit include 3rd resistor,
4th resistance and the second capacitance, one end of the 3rd resistor are connect with the output end of the rectification circuit, and the other end passes through institute
The 4th resistance is stated to connect with ground terminal；Second capacitance is parallel to the both ends of the 4th resistance；Second comparator
First input end is connected to the common end of the 3rd resistor and the 4th resistance.
5. surge protection circuit as described in claim 1, which is characterized in that the third bleeder circuit include the 5th resistance,
6th resistance, the 7th resistance, third capacitance and the 4th capacitance, the output end of one end and the rectification circuit of the 5th resistance
Connection, the other end are connect after being sequentially connected in series by the 6th resistance and the 7th resistance with ground terminal；The third capacitance is in parallel
In the both ends of the 5th resistance；4th capacitance is parallel to the both ends of the 7th resistance；The of the third comparator
One input terminal is connected to the common end of the 6th resistance and the 7th resistance.
6. surge protection circuit as claimed in claim 3, which is characterized in that the surge protection circuit further include by resistance and
4th bleeder circuit of capacitance composition, the control circuit further includes the 4th comparator；
The input terminal of 4th bleeder circuit is connect with the output end of the rectification circuit, the output of the 4th bleeder circuit
End is connect with the first input end of the 4th comparator, the second input terminal of the 4th comparator and the second partial pressure electricity
The output end on road connects；And when negative sense surge voltage is not present in the alternating current, the electricity of the output end of the 4th bleeder circuit
Voltage of the pressure less than the output end of second bleeder circuit；When the alternating current is there are when negative sense surge voltage, described 4th point
The voltage of the output end of volt circuit is more than the voltage of the output end of second bleeder circuit；
The third comparator is additionally operable to, when the output end voltage of the third bleeder circuit is less than the second preset value, control institute
State the output end output preset level signal of the 4th comparator.
7. surge protection circuit as claimed in claim 6, which is characterized in that the 4th bleeder circuit include the 8th resistance,
One end of 9th resistance and the 5th capacitance, the 8th resistance is connect with the output end of the rectification circuit, and the other end passes through institute
The 9th resistance is stated to connect with ground terminal；5th capacitance is parallel to the both ends of the 9th resistance；4th comparator
First input end is connected to the common end of the 8th resistance and the 9th resistance.
8. the surge protection circuit as described in any one of claim 1 to 7, which is characterized in that the rectification circuit includes the
One diode and the second diode, the anode of first diode is connect with the first ac input end of the alternating current, described
Second diode is connect with the second ac input end of the alternating current, the cathode of first diode and second diode
Cathode connection.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510054340.7A CN105990824B (en) | 2015-02-02 | 2015-02-02 | Surge protection circuit |
| JP2017540765A JP6473514B2 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic induction heating control circuit and electromagnetic induction heating equipment |
| KR1020177024696A KR102057136B1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| PCT/CN2015/082969 WO2016123897A1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| EP15880852.7A EP3255957B1 (en) | 2015-02-02 | 2015-06-30 | Electromagnetic heating control circuit and electromagnetic heating device |
| US15/665,044 US10638551B2 (en) | 2015-02-02 | 2017-07-31 | Electromagnetic heating control circuit and electromagnetic heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510054340.7A CN105990824B (en) | 2015-02-02 | 2015-02-02 | Surge protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105990824A CN105990824A (en) | 2016-10-05 |
| CN105990824B true CN105990824B (en) | 2018-10-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510054340.7A Active CN105990824B (en) | 2015-02-02 | 2015-02-02 | Surge protection circuit |
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| Country | Link |
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| CN (1) | CN105990824B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108666994B (en) * | 2017-03-31 | 2019-10-29 | 佛山市顺德区美的电热电器制造有限公司 | Household appliance and the surge protection circuit for household appliance, method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332713A (en) * | 2011-08-31 | 2012-01-25 | 深圳和而泰智能控制股份有限公司 | Anti-surge circuit for electromagnetic induction heating appliance, heating appliance and method |
| CN102707121A (en) * | 2012-06-14 | 2012-10-03 | 美的集团有限公司 | Voltage surge detection circuit |
| CN202679686U (en) * | 2012-05-09 | 2013-01-16 | 九阳股份有限公司 | Voltage sampling and surge protection circuit of electromagnetic stove |
| CN103166176A (en) * | 2011-12-16 | 2013-06-19 | 上海精翊电器有限公司 | Under-voltage protection tripper for low-voltage circuit breaker |
-
2015
- 2015-02-02 CN CN201510054340.7A patent/CN105990824B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332713A (en) * | 2011-08-31 | 2012-01-25 | 深圳和而泰智能控制股份有限公司 | Anti-surge circuit for electromagnetic induction heating appliance, heating appliance and method |
| CN103166176A (en) * | 2011-12-16 | 2013-06-19 | 上海精翊电器有限公司 | Under-voltage protection tripper for low-voltage circuit breaker |
| CN202679686U (en) * | 2012-05-09 | 2013-01-16 | 九阳股份有限公司 | Voltage sampling and surge protection circuit of electromagnetic stove |
| CN102707121A (en) * | 2012-06-14 | 2012-10-03 | 美的集团有限公司 | Voltage surge detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105990824A (en) | 2016-10-05 |
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