CN1942025A - Controlling circuit of microwave oven with photocoupling relay - Google Patents
Controlling circuit of microwave oven with photocoupling relay Download PDFInfo
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- CN1942025A CN1942025A CN 200510015275 CN200510015275A CN1942025A CN 1942025 A CN1942025 A CN 1942025A CN 200510015275 CN200510015275 CN 200510015275 CN 200510015275 A CN200510015275 A CN 200510015275A CN 1942025 A CN1942025 A CN 1942025A
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- circuit
- resistance
- triode
- microwave oven
- magnetron
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Abstract
The invention comprises a driving circuit and a magnetron output circuit; between driving circuit and magnetron output circuit, there is a photoelectricity buffer circuit for controlling the output from the magnetron output circuit according to the signals from the driving circuit. The invention uses the photoelectricity coupling relay to replace the magnetron relay in mechanical movement; because the optic signals can not be interference by electrical and magnetic field, the non-arcing turn-on or cut-off of the control circuit can be implemented by using photoelectrical signals.
Description
Technical field
The present invention relates to a kind of microwave oven.Particularly relate to a kind of controlling circuit of microwave oven that has photocoupling relay that can reduce the electromagnetic interference that is caused when magnetron is worked.
Background technology
Generally, microwave oven is that (per second is about 2,450MHz) is heating source, the intermolecular frictional heat that is taken place by the molecules align that confuses food and arrange the utensil of food with high frequency waves.
Fig. 1 is the decomposing schematic representation of the general structure of microwave oven; Fig. 2 is a drive circuit schematic diagram of the present invention.
As shown in Figure 1, existing microwave oven comprises: by front panel 11 and rear board 13 and the cooking cavity assembly 10 that constitutes; Cooking cavity 12 in the 10 inner sides formation of cooking cavity assembly; Be formed on cooking cavity assembly 10 inner opposite sides, be provided with the electric control chamber 14 of various electric components; Be arranged on the shell 20 in the outside of cooking cavity assembly 10.
Front panel 11 is installed in the front of cooking cavity assembly 10, constitutes the front of cooking cavity assembly 10, and the front of front panel 11 is provided with the door 30 that is used to open and close cooking cavity 12 inside.
Shell 20 form microwave ovens two sides and above outward appearance, and cooking cavity 12 and electric control chamber 14 are protected from the outside with front panel 11 and rear board 13.
The a plurality of intercommunicating pores of formation that are communicated with cooking cavity 12 inner spaces to the central part greatly of plate 13 in the back, in the back the back of plate 13 be provided with and rear board 13 between have the convection cell 40 in any space.
In the space that convection cell 40 is had, be provided with heater 41, and the convection fan 42 that makes the hot gas convection current in cooking cavity 12 that takes place from heater 41 is installed, and being equipped with in the back of convection cell 40 in order to drive convection fan 42, and the motor 43 that is connected with the axle of convection fan 42.
Be installed with the convection cell cover 50 of parcel convection cell 40 and motor 43 in the back on the plate 13, convection cell 40 and motor 43 are protected from the outside.
The back of convection cell cover 50 is formed with a plurality of air suction inlet 50a that can flow into air from the outside.Comprise the magnetron 14a that generates microwave by installation on the electric control chamber 14, supply with high-tension high-tension transformer 14b to magnetron 14a, and the fan electromotor 14d of the blowing fan 14c of the various electric components of cooling electric control chamber 14 inside and driving blowing fan 14c.Fan electromotor 14d is fixedly mounted on the inner face of rear board 13 1 sides, and around blowing fan 14c wind deflector is installed, thereby the guiding air is mobile.
But the microwave current stove all adopts common mechanical relay on drive circuit, and as shown in Figure 2, its drive part is to control by mechanical relay L to the driving of magnetron K.Yet induction reactance, capacitive reactance meeting that the mechanical relay coil is produced after energising impact the importation, promptly produce electromagnetic interference.
Summary of the invention
Technical problem to be solved by this invention is that a kind of controlling circuit of microwave oven that has photocoupling relay that can reduce the electromagnetic interference that is caused when magnetron is worked is provided.
The technical solution adopted in the present invention is: a kind of controlling circuit of microwave oven that has photocoupling relay, include drive circuit and magnetron output circuit, also be provided with photoelectric isolating circuit between drive circuit and the magnetron output circuit according to the signal controlling magnetron output circuit output of drive circuit.
Described drive circuit is to be connected with the base stage of triode Q39 by resistance R 10 by integrated package MCU, the grounded emitter of triode Q39, the emitter of triode Q39 also is connected with its base stage by resistance R 20, the collector electrode of triode Q39 is connected with resistance R 40, the other end of resistance R 40 is connected with the base stage of triode Q32, also the emitter by resistance R 37 and triode Q32 connects power supply jointly, and the collector electrode of triode Q32 connects photoelectric isolating circuit by resistance R 46.
Described photoelectric isolating circuit includes photoelectric isolating relay SSR, and resistance R 37 and capacitor C 2, wherein, the input connecting resistance R46 of photoelectric isolating circuit, resistance R 37 is connected with the output of photoelectric isolating relay SSR with capacitor C 2 series connection backs, and is connected with the magnetron output circuit as output.
The controlling circuit of microwave oven that has photocoupling relay of the present invention, use photocoupling relay to replace having the electromagnetic relay of mechanical movement, because the transmission of light signal is not subjected to the interference in electric field and magnetic field, adopt photoelectric isolation technology, utilize the magnetic of photoelectricity isolation electrical equipment and the characteristic of light to finish input and the reliable isolation of exporting, nonarcing connecting and disconnecting controlled circuit, can realize the control to magnetron, surge level when effectively having eliminated magnetron work and noise signal are to the influence of microwave oven control panel.
Description of drawings
Fig. 1 is the microwave oven structure schematic diagram;
Fig. 2 is the microwave oven driving of prior art and the principle schematic of magnetron output circuit;
Fig. 3 is the block diagram of microwave oven driving of the present invention and magnetron output circuit;
Fig. 4 is the principle schematic of microwave oven driving of the present invention and magnetron output circuit.
Embodiment
Describe the controlling circuit of microwave oven that has photocoupling relay of the present invention in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 2, the controlling circuit of microwave oven that has photocoupling relay of the present invention, include drive circuit A and magnetron output circuit B, also be provided with photoelectric isolating circuit M between drive circuit A and the magnetron output circuit B according to the signal controlling magnetron output circuit B output of drive circuit B.
As shown in Figure 3, microwave oven of the present invention drives and the principle of magnetron output circuit is, described drive circuit (A) is to be connected with the base stage of triode Q39 by resistance R 10 by integrated package MCU, the grounded emitter of triode Q39, the emitter of triode Q39 also is connected with its base stage by resistance R 20, the collector electrode of triode Q39 is connected with resistance R 40, the other end of resistance R 40 is connected with the base stage of triode Q32, also the emitter by resistance R 37 and triode Q32 connects power supply jointly, and the collector electrode of triode Q32 meets photoelectric isolating circuit M by resistance R 46.
Described photoelectric isolating circuit M includes photoelectric isolating relay SSR, and resistance R 37 and capacitor C 2, wherein, the input connecting resistance R46 of photoelectric isolating circuit M, resistance R 37 is connected with the output of photoelectric isolating relay SSR with capacitor C 2 series connection backs, and is connected with magnetron output circuit B as output.
Described magnetron output circuit B includes; the series circuit of being connected and being constituted by overheat protector device G, alternating current input power supplying U, protective tube S, high-tension transformer T and the output of photoelectric isolating circuit M successively, wherein the output of high-tension transformer T is connected magnetron K by capacitor C 1 with diode D1.
In the present embodiment: photocoupling relay adopts model: Toshiba TLP124;
Chip MCU adopts model: Toshiba TMP87PH47U.
The present invention utilizes photoelectricity to isolate the magnetic of electrical equipment and the characteristic of light is finished input and the reliable isolation of exporting, nonarcing connecting and disconnecting controlled circuit, can realize the control to magnetron, surge level when effectively having eliminated magnetron work and noise signal are to the influence of microwave oven control panel.
Claims (3)
1. controlling circuit of microwave oven that has photocoupling relay, include drive circuit (A) and magnetron output circuit (B), it is characterized in that, also be provided with photoelectric isolating circuit (M) between drive circuit (A) and the magnetron output circuit (B) according to signal controlling magnetron output circuit (B) output of drive circuit (B).
2. the controlling circuit of microwave oven that has photocoupling relay according to claim 1, it is characterized in that, described drive circuit (A) is to be connected with the base stage of triode Q39 by resistance R 10 by integrated package MCU, the grounded emitter of triode Q39, the emitter of triode Q39 also is connected with its base stage by resistance R 20, the collector electrode of triode Q39 is connected with resistance R 40, the other end of resistance R 40 is connected with the base stage of triode Q32, also the emitter by resistance R 37 and triode Q32 connects power supply jointly, and the collector electrode of triode Q32 connects photoelectric isolating circuit (M) by resistance R 46.
3. the controlling circuit of microwave oven that has photocoupling relay according to claim 1, it is characterized in that, described photoelectric isolating circuit (M) includes photoelectric isolating relay SSR, and resistance R 37 and capacitor C 2, wherein, the input connecting resistance R46 of photoelectric isolating circuit (M), resistance R 37 is connected with the output of photoelectric isolating relay SSR with capacitor C 2 series connection backs, and is connected with magnetron output circuit (B) as output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015275 CN1942025A (en) | 2005-09-29 | 2005-09-29 | Controlling circuit of microwave oven with photocoupling relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015275 CN1942025A (en) | 2005-09-29 | 2005-09-29 | Controlling circuit of microwave oven with photocoupling relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1942025A true CN1942025A (en) | 2007-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510015275 Pending CN1942025A (en) | 2005-09-29 | 2005-09-29 | Controlling circuit of microwave oven with photocoupling relay |
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| CN (1) | CN1942025A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538038A (en) * | 2011-12-31 | 2012-07-04 | 广东美的微波电器制造有限公司 | Micro-wave oven with Bluetooth function |
| CN102563724A (en) * | 2011-12-31 | 2012-07-11 | 广东美的微波电器制造有限公司 | Microwave oven with Bluetooth function |
| CN103063992A (en) * | 2012-12-31 | 2013-04-24 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
| CN104981039A (en) * | 2015-07-29 | 2015-10-14 | 南通皋鑫电子股份有限公司 | Device for detecting instant surge pulse of microwave oven in starting |
-
2005
- 2005-09-29 CN CN 200510015275 patent/CN1942025A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538038A (en) * | 2011-12-31 | 2012-07-04 | 广东美的微波电器制造有限公司 | Micro-wave oven with Bluetooth function |
| CN102563724A (en) * | 2011-12-31 | 2012-07-11 | 广东美的微波电器制造有限公司 | Microwave oven with Bluetooth function |
| CN102538038B (en) * | 2011-12-31 | 2015-07-01 | 广东美的厨房电器制造有限公司 | Micro-wave oven with Bluetooth function |
| CN103063992A (en) * | 2012-12-31 | 2013-04-24 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
| CN103063992B (en) * | 2012-12-31 | 2015-08-26 | 山东电力集团公司青岛供电公司 | Oscillatory wave system |
| CN104981039A (en) * | 2015-07-29 | 2015-10-14 | 南通皋鑫电子股份有限公司 | Device for detecting instant surge pulse of microwave oven in starting |
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