CN201657386U - Zero-crossing circuit of microwave oven - Google Patents
Zero-crossing circuit of microwave oven Download PDFInfo
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- CN201657386U CN201657386U CN2010201518922U CN201020151892U CN201657386U CN 201657386 U CN201657386 U CN 201657386U CN 2010201518922 U CN2010201518922 U CN 2010201518922U CN 201020151892 U CN201020151892 U CN 201020151892U CN 201657386 U CN201657386 U CN 201657386U
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- 238000001914 filtration Methods 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 239000000284 extract Substances 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 abstract 3
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model relates to a microwave oven zero passage circuit, its characterized in that: the half-wave rectification circuit comprises a half-wave rectification circuit (1), a current limiting circuit (2), a filtering and frequency taking circuit (3), an optical coupling isolation circuit (4) and a zero signal extraction circuit (5); the half-wave rectification circuit (1) outputs the commercial power to the current limiting circuit (2) after performing half-wave rectification, the current limiting circuit reduces the circuit voltage and then inputs the circuit voltage to the filtering frequency-taking circuit (3), the current after filtering frequency-taking is connected to the optical coupling isolation circuit (4), the optical coupling isolation circuit then connects the current to the zero signal extraction circuit (5), and the zero-crossing signal of the commercial power is extracted from the zero signal extraction circuit. The utility model provides a take zero passage signal's uniformity, integrality, reliability, energy-conservation nature from the high-pressure side to application voltage range is wide.
Description
Technical field
The utility model relates to the zero crossing circuitry in a kind of Switching Power Supply, especially the microwave oven zero crossing circuitry in the microwave oven Switching Power Supply.
Background technology
Traditional microwave oven control panel generally becomes low-voltage (about 10V) by transformer with high voltage (civil power), powers to control board by rectification and voltage stabilizing circuit again, and wherein zero cross signal also is to take out (as shown in Figure 1) from low-voltage end.Adopt this mode of transformer to have the problem of wasting energy, the one, efficient is low excessively; The 2nd, circuit structure is big, stand-by power consumption is high.Along with the continuous development of microwave oven industry, the power consumption problem is subjected to people's attention day by day, and in order to solve energy problem, switch power technology is used to microwave oven.Because the switch power efficiency height, stand-by power consumption is little, meets the requirement of European Union to the family appliance standby power consumption fully.Adopt the microwave oven zero cross signal of switch power technology to take out from high voltage end, because the frequency of high-tension electricity part (civil power) has been different from partly frequency of low-voltage, therefore original zero cross signal circuit can't be realized.
The utility model content
The purpose of this utility model be overcome the deficiencies in the prior art and provide a kind of can be from the microwave oven zero cross signal circuit of high-tension electricity extracting section zero cross signal, it can be used in the microwave road of adopting switch power technology, can guarantee that the integrality of zero cross signal can solve power problems again.
For achieving the above object, the utility model is achieved in that it comprises that frequency circuit, optical coupling isolation circuit are got in half-wave rectifying circuit, current-limiting circuit, filtering and zero-signal is extracted circuit; Described half-wave rectifying circuit carries out civil power to export current-limiting circuit to after the halfwave rectifier, be input to filtering after current-limiting circuit reduces circuit voltage and get frequency circuit, electric current after getting frequently through filtering inserts optical coupling isolation circuit, optical coupling isolation circuit inserts electric current zero-signal again and extracts in the circuit, extracts the zero cross signal that extracts civil power the circuit from zero-signal again.
Described half-wave rectifying circuit comprises diode, described current-limiting circuit comprises first resistance, described filter circuit comprises first electric capacity, the 4th resistance and triode, described photoelectric coupled circuit comprises second resistance and optocoupler, the collector electrode of two inputs, the one termination triode of optocoupler, the other end connects direct-current working volts by second resistance, and described zero-signal is extracted circuit and comprised the 3rd resistance and second electric capacity; The positive pole of diode connects the live wire of civil power, negative pole connects first resistance, the other end of first resistance connects an end of first electric capacity respectively, one end of the 4th resistance and transistor base are electrically connected, the other end connecting to neutral line or the ground connection of the 4th resistance R 4, the emitter connecting to neutral line or the ground connection of triode, the other end of first electric capacity connects the collector electrode of triode and the negative electrode input pin of optocoupler respectively, the anode input pin of optocoupler connects an end of second resistance, another termination power DC of second resistance, the emitter output pin ground connection of optocoupler, the collector electrode output pin of optocoupler connects an end of second electric capacity and an end of the 3rd resistance respectively, another termination power of the 3rd resistance, the other end ground connection of second electric capacity, the collector electrode output pin of optocoupler U1 are that civil power is got the zero position place.
Operation principle of the present utility model is that civil power carries out halfwave rectifier through diode, carry out current limliting through first resistance then, electric current is finished Filtering Processing after filtration during wave circuit, both when alternating current triode conducting during at positive half cycle, when alternating current during at negative half period triode end, second resistance is powered to optocoupler, and optocoupler has played the effect that high-low pressure is isolated, and gets zero circuit and just can obtain zero cross signal on the collector electrode output pin of optocoupler.
The utility model has solved consistency, integrality, reliability, the energy saving of getting zero cross signal from high-pressure side, and suitable voltage range is wide.
Description of drawings
The existing zero cross signal circuit diagram of Fig. 1
Fig. 2 zero cross signal circuit block diagram of the present utility model
Fig. 3 zero cross signal circuit structure of the present utility model schematic diagram
Embodiment
The utility model is described in further detail below in conjunction with concrete fact Example.
As shown in Figure 2, the microwave oven zero crossing circuitry comprises that half-wave rectifying circuit 1, current-limiting circuit 2, filtering gets frequency circuit 3, optical coupling isolation circuit 4 and get zero-signal and extract circuit 5.Described half-wave rectifying circuit carries out civil power to export current-limiting circuit to after the halfwave rectifier, be input to filtering after current-limiting circuit reduces circuital current and get frequency circuit, electric current after getting frequently through filtering inserts light idol buffer circuit, optical coupling isolation circuit inserts electric current zero-signal again and extracts in the circuit, extracts the circuit from zero-signal and just can take out the zero cross signal of civil power.
As shown in Figure 3, described half-wave rectifying circuit 1 comprises diode D1, described current-limiting circuit 2 comprises first resistance R 1, described filtering is got frequency circuit 3 and is comprised first capacitor C 1, the 4th resistance R 4 and triode Q1, described optical coupling isolation circuit 4 comprises second resistance R 2 and optocoupler U1, and described zero-signal is extracted circuit 5 and comprised the 3rd resistance R 3 and second capacitor C 2.The positive pole of diode D1 connects the live wire of civil power, negative pole connects first resistance R 1, the other end of first resistance R 1 connects an end of first capacitor C 1 respectively, one end of the 4th resistance R 4 and triode Q1 base stage, the other end connecting to neutral line (ground connection) of the 4th resistance R 4, the emitter connecting to neutral line (ground connection) of triode Q1, the other end of first capacitor C 1 connects the collector electrode of triode Q1 and the negative electrode input pin of optocoupler U1 respectively, the anode input pin of optocoupler U1 connects an end of second resistance R 2, another termination power DC of second resistance R 2, the emitter output pin ground connection of optocoupler U1, the mechanical ﹠ electrical technology haptic element of optocoupler U1 connects an end of second capacitor C 2 and an end of ground three resistance respectively, another termination power of the 3rd resistance R 3, the other end ground connection of second capacitor C 2, the collector electrode output pin of optocoupler U1 are that civil power is got the zero position place.
Claims (2)
1. microwave oven zero crossing circuitry is characterized in that: comprise that half-wave rectifying circuit (1), current-limiting circuit (2), filtering gets frequency circuit (3), optical coupling isolation circuit (4) and zero-signal and extract circuit (5); Described half-wave rectifying circuit (1) carries out civil power to export current-limiting circuit (2) to after the halfwave rectifier, be input to filtering after current-limiting circuit reduces circuit voltage and get frequency circuit (3), electric current after getting frequently through filtering inserts optical coupling isolation circuit (4), optical coupling isolation circuit inserts electric current zero-signal again and extracts in the circuit (5), extracts the zero cross signal that extracts civil power the circuit from zero-signal again.
2. microwave oven zero crossing circuitry according to claim 1, it is characterized in that: described half-wave rectifying circuit (1) comprises diode (D1), described current-limiting circuit comprises first resistance (R1), described filter circuit comprises first electric capacity (C1), the 4th resistance (R4) and triode (Q1), described optical coupling isolation circuit comprises second resistance (R2) and optocoupler (U1), the collector electrode of two inputs, the one termination triode of optocoupler, the other end connects direct-current working volts (DC) by second resistance, and described zero-signal is extracted circuit and comprised the 3rd resistance (R3) and second electric capacity (C2); The positive pole of diode (D1) connects the live wire of civil power, negative pole connects first resistance (R1), the other end of first resistance (R1) connects an end of first electric capacity (C1) respectively, one end of the 4th resistance (R4) and triode (Q1) base stage are electrically connected, the other end connecting to neutral line or the ground connection of the 4th resistance (R4), the emitter connecting to neutral line or the ground connection of triode (Q1), the other end of first electric capacity (C1) connects the collector electrode of triode (Q1) and the negative electrode input pin of optocoupler (U1) respectively, the anode input pin of optocoupler (U1) connects an end of second resistance (R2), another termination power (DC) of second resistance (R2), the emitter output pin ground connection of optocoupler (U1), the collector electrode output pin of optocoupler (U1) connects an end of second electric capacity (C2) and an end of the 3rd resistance respectively, another termination power of the 3rd resistance (R3), the other end ground connection of second electric capacity (C2), the collector electrode output pin of optocoupler (U1) are that civil power is got the zero position place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201518922U CN201657386U (en) | 2010-03-30 | 2010-03-30 | Zero-crossing circuit of microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201518922U CN201657386U (en) | 2010-03-30 | 2010-03-30 | Zero-crossing circuit of microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201657386U true CN201657386U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201518922U Expired - Fee Related CN201657386U (en) | 2010-03-30 | 2010-03-30 | Zero-crossing circuit of microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201657386U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991112A (en) * | 2015-07-06 | 2015-10-21 | 江苏春兰制冷设备股份有限公司 | Voltage zero-crossing detection circuit applicable to switching power source |
| CN110133359A (en) * | 2019-05-23 | 2019-08-16 | 广东美的制冷设备有限公司 | Air conditioner zero cross detection circuit, electric control gear and air conditioner |
-
2010
- 2010-03-30 CN CN2010201518922U patent/CN201657386U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991112A (en) * | 2015-07-06 | 2015-10-21 | 江苏春兰制冷设备股份有限公司 | Voltage zero-crossing detection circuit applicable to switching power source |
| CN110133359A (en) * | 2019-05-23 | 2019-08-16 | 广东美的制冷设备有限公司 | Air conditioner zero cross detection circuit, electric control gear and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
|
| CP03 | Change of name, title or address |
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 Penglai Road, Beijiao Town, Foshan District, Guangdong, China, Patentee before: Midea Group |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20190330 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |