CN105990824B - Surge protection circuit - Google Patents

Surge protection circuit Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
circuit
output
resistance
comparator
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201510054340.7A
Other languages
Chinese (zh)
Other versions
CN105990824A (en
Inventor
刘志才
王志锋
翁文丰
区达理
马志海
伍世润
陈逸凡
王新元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201510054340.7A priority Critical patent/CN105990824B/en
Priority claimed from PCT/CN2015/082969 external-priority patent/WO2016123897A1/en
Publication of CN105990824A publication Critical patent/CN105990824A/en
Application granted granted Critical
Publication of CN105990824B publication Critical patent/CN105990824B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Surge protection circuit
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.
CN201510054340.7A 2015-02-02 2015-02-02 Surge protection circuit Active CN105990824B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510054340.7A CN105990824B (en) 2015-02-02 2015-02-02 Surge protection circuit

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201510054340.7A CN105990824B (en) 2015-02-02 2015-02-02 Surge protection circuit
PCT/CN2015/082969 WO2016123897A1 (en) 2015-02-02 2015-06-30 Electromagnetic heating control circuit and electromagnetic heating device
JP2017540765A JP6473514B2 (en) 2015-02-02 2015-06-30 Electromagnetic induction heating control circuit and electromagnetic induction heating equipment
EP15880852.7A EP3255957B1 (en) 2015-02-02 2015-06-30 Electromagnetic heating control circuit and electromagnetic heating device
KR1020177024696A KR102057136B1 (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

Publications (2)

Publication Number Publication Date
CN105990824A CN105990824A (en) 2016-10-05
CN105990824B true CN105990824B (en) 2018-10-02

Family

ID=57036893

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510054340.7A Active CN105990824B (en) 2015-02-02 2015-02-02 Surge protection circuit

Country Status (1)

Country Link
CN (1) CN105990824B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
US8085010B2 (en) TRIAC/SCR-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
CA2695192C (en) Igbt/fet-based energy savings device, system and method
CN102662104B (en) Zero-crossing detection method and circuit
CN103442492B (en) A kind of capacitor step-down LED driver and capacitor step-down LED driving method thereof
US7933108B2 (en) Motor drive with low leakage surge protection
CN102290972A (en) Switch power supply and controlling circuit and controlling method thereof
CN102419400B (en) Method for detecting input phase failure of three-phase input device
MX2013003610A (en) System and method to manage power usage.
JP4845910B2 (en) Earth leakage breaker
CN102215035B (en) A kind of isolation of the electric main in conjunction with low-voltage powerline carrier communication signal coupling zero cross detection circuit
CN101867168A (en) Power protecting circuit and LED lamp
CN105301522B (en) A kind of detection method of three-phase mains power down
CN204882727U (en) Scarce phase sequence detection circuit that reaches mutually of three -phase input voltage
CN103063979B (en) Load open-circuit detection circuit
CN107681626A (en) The protection circuit and its control method of air-conditioner controller
CN204578083U (en) To ask for power type lightning arrester supervisory control system
CN202994892U (en) Power supply failure detection unit
CN102623947B (en) A kind of earth leakage protective device with phase line handoff functionality
CN105305800B (en) A kind of surge current suppression circuit
CN104466900B (en) A kind of input voltage overvoltage crowbar
CN104914293B (en) Power-fail detection circuit and device
CN205584024U (en) Take switching power supply circuit of excess temperature protection
CN104698291B (en) Three-phase four-wire system lacks zero curve Function detection circuit and detection method
CN201797312U (en) Network port circuit of Ethernet power supply device
CN102412720B (en) Switching power circuit and power factor correction (PFC) control circuit thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant