CN101699689B - Surge response protection circuit of induction cooker - Google Patents
Surge response protection circuit of induction cooker Download PDFInfo
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- CN101699689B CN101699689B CN2009102113215A CN200910211321A CN101699689B CN 101699689 B CN101699689 B CN 101699689B CN 2009102113215 A CN2009102113215 A CN 2009102113215A CN 200910211321 A CN200910211321 A CN 200910211321A CN 101699689 B CN101699689 B CN 101699689B
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- 230000006698 induction Effects 0.000 title abstract 2
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
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Abstract
The invention relates to a surge response protection circuit of an induction cooker, which comprises a rectifying circuit (1), a surge response circuit (2), a zero-crossing detection circuit (3), a shielding surge response circuit (4) and a subsequent circuit (5). The commercial power is accessed from the input end of the rectification circuit (1), the input ends of the surge response circuit (2) and the zero-crossing detection circuit (3) are connected with the output end of the rectification circuit (1), the output ends of the surge response circuit (2) and the zero-crossing detection circuit (3) are connected with the shielding surge response circuit (4), and the output end of the shielding surge response circuit (4) is connected with the subsequent circuit (5). The surge response circuit (2) can respond to positive and negative pulse surges, the zero-crossing detection circuit (3) detects the zero-crossing state of the rectified grid voltage waveform, and the shielding surge response circuit (4) is used for shielding surge false response of the voltage in a zero-crossing period in the zero-crossing period so that surge protection does not work in a zero-crossing window period.
Description
Technical field
The present invention relates to a kind of surge response protective circuit of electromagnetic oven, more particularly, relate to a kind of electromagnetic oven surge response protective circuit that can respond positive and negative pulse surge.
Background technology
Surge also is surging, as the term suggests be exactly the moment sudden change of normal working voltage.Say that in essence surge is to occur in the microsecond level to interior a kind of potential pulse of Millisecond time, possibly cause that the reason of surge has jumbo, short circuit, power supply to switch or big-block engine.In Electronic Design, surge mainly refers to the strong pulse that the sudden change of power supply moment produces, because circuit itself is non-linear, and the very large sudden change that may on operating voltage, superpose, this is called surge.Surge might make circuit moment burn out, and surge protection utilizes the protective circuit of non-linear element to the sensitivity design of high frequency (surge) exactly.The common scheme of electromagnetic oven surge protection circuit can only respond the surge direct impulse, and when the surge of negative-going pulse was arranged in the circuit, some key components of electromagnetic oven also can be damaged and make electromagnetic oven work occur unusually, and the protection of traditional circuit is comprehensive inadequately.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective and provide a kind of cost low, safe and reliable, the surge response protective circuit of the fast comprehensive electromagnetic oven of response.
In order to realize above-mentioned technical purpose; The present invention program is: a kind of surge response protective circuit of electromagnetic oven; Comprise rectification circuit, surge response circuit, zero cross detection circuit, shielding surge response circuit and subsequent conditioning circuit; Civil power inserts from the input of rectification circuit; The input of surge response circuit and zero cross detection circuit all is connected with the output of rectification circuit, and the output of surge response circuit and zero cross detection circuit all is connected with shielding surge response circuit, and the output of shielding surge response circuit connects subsequent conditioning circuit.
Described surge response circuit comprises sample circuit and comparison circuit; The output of rectification circuit is connected with the sample circuit input, and the output of sample circuit is connected with comparison circuit; The comparison circuit output circuit is for the response of positive and negative surge.
Further, said sample circuit comprises resistance R 1, R2, R3, R4; The comparison circuit of described surge response circuit comprises comparator U1A and U1B;
Described resistance R 1 one ends connect the output of rectification circuit, and the other end links to each other with the end of resistance R 2, R3, R4, and the other end of resistance R 4 is the A end; The other end of resistance R 2 is the B end; The other end of resistance R 3 is the C end;
The A end is connected with the input of comparator U1A, and the B end is connected with the input of comparator U1A and U1B, and the C end is connected with the input of comparator U1B; The output of comparator U1A and U1B all inserts the input of shielding surge response circuit;
Also comprise resistance R 5, R6, R7 and capacitor C 1, C2, A holds ground connection behind parallelly connected R7 and the C1, and the B end is through resistance R 5 ground connection, and C holds ground connection behind parallelly connected R6 and the C2.
Further, scheme 1 is that said A end is connected with the negative input end of comparator U1A, said B end is connected with the positive input terminal of comparator U1A and the negative input end of comparator U1B; Said C end is connected with the positive input terminal of comparator U1B.
Further, scheme 2 is that said A end is connected with the negative input end of comparator U1A, said B end is connected with the negative input end of comparator U1A and the positive input terminal of comparator U1B; Said C end is connected with the negative input end of comparator U1B.
Further, scheme 3 is that said A end is connected with the positive input terminal of comparator U1A, said B end is connected with the negative input end of comparator U1A and the negative input end of comparator U1B; Said C end is connected with the positive input terminal of comparator U1B.
Further, scheme 4 is that said A end is connected with the positive input terminal of comparator U1A, said B end is connected with the negative input end of comparator U1A and the positive input terminal of comparator U1B; Said C end is connected with the negative input end of comparator U1B.
Further, the output of comparator U1A and U1B is connected with power supply through pull-up resistor.
Among the present invention, when not having surge to take place, comparator U1A, stable high level or the low level of U1B output.When the negative sense surge took place, because the filter action of capacitor C 1, signal A changed slowly, and signal B follows this negative sense surge closely to be changed, and when the moment of B＜A, caused comparator U1A upset, and circuit produces the response for this negative sense surge; When the forward surge took place, because the filter action of capacitor C 2, signal C changed slowly, and signal B follows the forward surge closely to be changed, and when the moment of B＞C, caused comparator U1B upset, and circuit produces the response for this forward surge.Zero cross detection circuit detects the mistakes nought state of the grid voltage waveform after the rectification, and it is that surge mistake in during zero responds that zero passage phase inner shield surge response circuit is used for mask voltage, makes that surge protection is inoperative between the zero passage window phase.The present invention can respond forward pulse surge owing to adopt two modes relatively, can respond the negative-going pulse surge again.It is compared with the existing surge circuit that only can respond direct impulse, can realize protection more reliably.
Description of drawings
Fig. 1, be circuit block diagram of the present invention;
Fig. 2,2A, 2B, 2C, 2D are four kinds of circuit theory diagrams of surge response circuit of the present invention (2);
Fig. 3,3A, 3B are respectively the waveform sudden change that sampled signal A of the present invention, B, C influence by negative sense surge and forward surge to scheme;
Fig. 4, be the embodiments of the invention circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Like Fig. 1,3, shown in 4, comprise rectification circuit 1, surge response circuit 2, zero cross detection circuit 3, shielding surge response circuit 4 and subsequent conditioning circuit 5.Civil power inserts from the input of rectification circuit 1; The input of surge response circuit 2 and zero cross detection circuit 3 all is connected with the output of rectification circuit 1; The output of surge response circuit 2 and zero cross detection circuit 3 all is connected with shielding surge response circuit 4, and the output of shielding surge response circuit 4 connects subsequent conditioning circuit 5.
Described surge response circuit 2 comprises sample circuit 21 and comparison circuit 22; Sample circuit 21 in the surge response circuit 2 comprises resistance R 1, R2, R3, R4, R5, R6, R7 and capacitor C 1, C2.Comparison circuit 22 in the described surge response circuit 2 comprises comparator U1A, U1B and resistance R 8, R9.
Described resistance R 1 one ends connect the output of rectification circuit 1; The other end links to each other with the end of resistance R 2, R3, R4; The other end of resistance R 4 links to each other with the negative terminal of comparator U1A, and the other end of resistance R 3 links to each other with the anode of comparator U1B, and the other end of resistance R 2 is connected between the negative terminal of anode and U1B of comparator U1A; One end of resistance R 7 is connected that end that resistance R 4 links to each other with comparator U1A negative terminal, other end ground connection.Capacitor C 1 is connected in parallel on the two ends of resistance R 7.One of resistance R 5 terminates at that end that resistance R 2 is connected with comparator U1A anode, U1B negative terminal, other end ground connection.One of resistance R 6 terminates at that end that resistance R 3 is connected with comparator U1B anode, other end ground connection, and capacitor C 2 is connected in parallel on the two ends of resistance R 6.Pull-up resistor R8 one end is connected the output of comparator U1A, another termination+5V power supply.The output of comparator U1A, U1B inserts the negative terminal that shields the comparator U1D in the surge response circuit 4 with the back.
In the present embodiment and since the output of comparator U1A and U1B with after be connected the negative terminal that shields the comparator U1D in the surge response circuit 4, can realize function by a shared pull-up resistor.So present embodiment saves resistance R 9.
Zero cross detection circuit 3 comprises resistance R 11, R12, R13, R14, capacitor C 3, comparator U1C.The output of resistance R 11 1 termination rectification circuits, the other end inserts the anode of comparator U1C, and an end of resistance R 12 connects the end that resistance R 11 links to each other with comparator U1C anode, other end ground connection.Capacitor C 3 is connected in parallel on the two ends of resistance R 12.Resistance R 13 1 terminations+5V power supply, the other end inserts the negative terminal of comparator U1C, and an end of resistance R 14 connects the end that resistance R 13 links to each other with comparator U1C negative terminal, other end ground connection.The output of comparator U1C inserts the negative terminal of the diode D1 in the shielding surge response circuit 4.
Shielding surge response circuit (4) comprises resistance R 21, R22, R23, diode D1, comparator U1D.Resistance R 21 1 terminations+5V power supply, the other end inserts the anode of comparator U1D, and an end of resistance R 22 connects the end that resistance R 21 links to each other with comparator U1D anode, other end ground connection.Resistance R 23 1 terminations+5V power supply, the other end inserts the output of comparator U1D.The output of the positive termination comparator U1D of diode D1, negative terminal are taken over the output of the comparator U1C in zero testing circuit 3.The output of comparator U1D connects the input of subsequent conditioning circuit 5.
Subsequent conditioning circuit 5 can be the middle fracture of single-chip microcomputer, turn-offs IGBT through Single-chip Controlling then; It also can be other circuit that directly turn-offs IGBT.
In the present embodiment, suppose when not having surge to take place, comparator U1A, the stable high level of U1B output, the output of comparator U1A, U1B with after be high level still, and export to the negative terminal that shields the comparator U1D in the surge response circuit 4.
When the negative sense surge took place, because the filter action of capacitor C 1, signal A changed slowly; Signal B follows surge closely to be changed, and when the moment of B＜A, comparator U1A upset is output low level; And comparator U1B output does not become high level, but since the output of comparator U1A, U1B with, so the state of surge response circuit changes; Become low level by high level, and export to the negative terminal of the comparator U1D in the shielding surge response circuit 4.Surge response circuit 2 itself produces the response for this negative sense surge simultaneously;
When the forward surge took place, because the filter action of capacitor C 2, signal C changed slowly; Signal B follows surge closely to be changed, and when B＞C moment, comparator U1B upset is output low level; And comparator U1A output state does not become high level, but since the output of comparator U1A, U1B with, so the state of surge response circuit (2) changes; Become low level by high level, and export to the negative terminal of the comparator U1D in the shielding surge response circuit 4.Surge response circuit 2 itself produces the response for this forward surge simultaneously.
To sum up, surge response circuit 2 can be made response to forward, two kinds of surges of negative sense.
Because when line voltage was in nought state, comparator U1A or U1B in the surge response circuit 2 also can overturn, produce the mistake response.So introduce zero cross detection circuit (3) and shielding surge response circuit (4).Resistance R 11, R12, capacitor C 3 are used as sampling rectification voltage signal D afterwards in the zero cross detection circuit 3; Resistance R 13, R14 produce benchmark signal E through dividing potential drop.When the line voltage zero passage, the voltage signal synchronization zero-cross after the rectification.At this moment, D＜E, comparator U1C output low level, expression line voltage zero passage.
Comparator U1D in the shielding surge response circuit 4 is used for the output anti-phase the surge response circuit, makes that U1D was output as high level when surge took place.If this moment, line voltage was a nought state, also be comparator U1C output low level, surge response circuit 2 is understood misoperations and is made U1D be output as high level.And this moment, the comparator U1C in the zero cross detection circuit 3 was output as low level, and diode D1 conducting draws the output of U1D to be low level.Make between the zero passage window phase response of surge response circuit 2 and protect inoperative.
The present invention describes through some embodiment, and those skilled in the art can carry out various changes or equivalence replacement to these characteristics and embodiment under the situation that does not break away from the spirit and scope of the present invention.In addition, under instruction of the present invention, can make amendment to these characteristics and embodiment can not break away from the spirit and scope of the present invention to adapt to concrete situation and material.Therefore, do not receive the restriction of specific embodiment disclosed herein in the present invention, all embodiment that fall in the application's the claim scope belong to protection scope of the present invention.
Claims (6)
1. the surge response protective circuit of an electromagnetic oven; Comprise rectification circuit (1), surge response circuit (2), zero cross detection circuit (3), shielding surge response circuit (4) and subsequent conditioning circuit (5); Civil power inserts from the input of rectification circuit (1); The input of surge response circuit (2) and zero cross detection circuit (3) all is connected with the output of rectification circuit (1); The output of surge response circuit (2) and zero cross detection circuit (3) all is connected with shielding surge response circuit (4), and the output of shielding surge response circuit (4) connects subsequent conditioning circuit (5);
Described surge response circuit (2) comprises sample circuit (21) and comparison circuit (22); The output of rectification circuit (1) is connected with sample circuit (21) input, and the output of sample circuit (21) is connected with comparison circuit (22); Comparison circuit (22) output circuit produces the response for positive and negative surge; Said sample circuit (21) comprises resistance R 1, R2, R3, R4; The comparison circuit (22) of described surge response circuit (2) comprises comparator U1A and U1B;
Described resistance R 1 one ends connect the output of rectification circuit (1), and the other end links to each other with the end of resistance R 2, R3, R4, and the other end of resistance R 4 is the A end; The other end of resistance R 2 is the B end; The other end of resistance R 3 is the C end;
The A end is connected with the input of comparator U1A, and the B end is connected with the input of comparator U1A and U1B, and the C end is connected with the input of comparator U1B; The output of comparator U1A and U1B all inserts the input of shielding surge response circuit (4);
Also comprise resistance R 5, R6, R7 and capacitor C 1, C2, A end parallel resistance R7 and capacitor C 1 back ground connection, the B end is through resistance R 5 ground connection, and C holds parallel resistance R6 and capacitor C 2 back ground connection.
2. the surge response protective circuit of electromagnetic oven according to claim 1 is characterized in that said A end is connected with the negative input end of comparator U1A, and said B end is connected with the positive input terminal of comparator U1A and the negative input end of comparator U1B; Said C end is connected with the positive input terminal of comparator U1B.
3. the surge response protective circuit of electromagnetic oven according to claim 1 is characterized in that said A end is connected with the negative input end of comparator U1A, and said B end is connected with the negative input end of comparator U1A and the positive input terminal of comparator U1B; Said C end is connected with the negative input end of comparator U1B.
4. the surge response protective circuit of electromagnetic oven according to claim 1 is characterized in that said A end is connected with the positive input terminal of comparator U1A, and said B end is connected with the negative input end of comparator U1A and the negative input end of comparator U1B; Said C end is connected with the positive input terminal of comparator U1B.
5. the surge response protective circuit of electromagnetic oven according to claim 1 is characterized in that said A end is connected with the positive input terminal of comparator U1A, and said B end is connected with the negative input end of comparator U1A and the positive input terminal of comparator U1B; Said C end is connected with the negative input end of comparator U1B.
6. according to the surge response protective circuit of each described electromagnetic oven of claim 1～5, it is characterized in that the output of comparator U1A and U1B is connected with power supply through pull-up resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102113215A CN101699689B (en) | 2009-10-25 | 2009-10-25 | Surge response protection circuit of induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102113215A CN101699689B (en) | 2009-10-25 | 2009-10-25 | Surge response protection circuit of induction cooker |
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| Publication Number | Publication Date |
|---|---|
| CN101699689A CN101699689A (en) | 2010-04-28 |
| CN101699689B true CN101699689B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102113215A Active CN101699689B (en) | 2009-10-25 | 2009-10-25 | Surge response protection circuit of induction cooker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106470507B (en) * | 2015-08-18 | 2023-04-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and surge detection device thereof |
| CN108808642A (en) * | 2017-05-03 | 2018-11-13 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit and electrical equipment |
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Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
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Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 Foshan, Shunde District, Beijiao Town, Penglai Road, the United States Industrial City Patentee before: Midea Group |