JP2563571B2 - High frequency heating equipment - Google Patents
High frequency heating equipmentInfo
- Publication number
- JP2563571B2 JP2563571B2 JP1097129A JP9712989A JP2563571B2 JP 2563571 B2 JP2563571 B2 JP 2563571B2 JP 1097129 A JP1097129 A JP 1097129A JP 9712989 A JP9712989 A JP 9712989A JP 2563571 B2 JP2563571 B2 JP 2563571B2
- Authority
- JP
- Japan
- Prior art keywords
- high frequency
- antenna
- heating chamber
- circuit
- frequency heating
- 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.)
- Expired - Lifetime
Links
Landscapes
- Electric Ovens (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は電子レンジなどの庫内の電波強度を検出し、
マグネトロンなどの高周波熱源を制御する高周波加熱装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention detects the radio field intensity in a refrigerator such as a microwave oven,
The present invention relates to a high frequency heating device that controls a high frequency heat source such as a magnetron.
従来の技術 従来例では特開昭59−207595号公報にみられるように
被加熱物（以下、食品と略す）の加熱度合に応じて変化
する食品の誘電率変化を検出して高周波加熱源を制御す
るものが示されている。2. Description of the Related Art In a conventional example, as shown in Japanese Patent Laid-Open No. 59-207595, a high-frequency heating source is detected by detecting a change in the dielectric constant of food that changes depending on the heating degree of an object to be heated (hereinafter abbreviated as food). What controls is shown.
発明が解決しようとする課題 このような従来の方式では対象が食品であるために加
熱時に多くの水分や油分が庫内に飛散し、これがアンテ
ナと接地面間に介在することにより検出特性を大きく変
えるという課題があった。Problems to be Solved by the Invention In such a conventional method, since the object is food, a large amount of water or oil is scattered in the chamber during heating, and the detection characteristics are greatly increased by interposing this between the antenna and the ground plane. There was a challenge to change.
課題を解決するための手段 本発明は、かかる課題を解決するために、加熱室空間
とアンテナの間に誘電体板を介在した構成をとり、か
つ、マイクロ波の検波回路と制御回路の少なくとも１部
を、１枚のプリント基板上に構成するものである。Means for Solving the Problems In order to solve the above problems, the present invention has a structure in which a dielectric plate is interposed between a heating chamber space and an antenna, and at least one of a microwave detection circuit and a control circuit. The parts are formed on one printed circuit board.
作用 本発明によれば、食品から飛散する油水分が直接アン
テナと接地面間に介在することがなく、かつ、制御回路
の１部が、検波回路と同一プリント基板上に搭載されて
いるので、安定した特性の高周波加熱源の制御が可能に
なる。Effect According to the present invention, oil and water splashing from food does not directly intervene between the antenna and the ground plane, and a part of the control circuit is mounted on the same printed circuit board as the detection circuit. It is possible to control the high frequency heating source with stable characteristics.
実施例 第１図は本発明の高周波加熱装置を示すブロック図で
ある。高周波発振器１から出た電波は、導波管２を介し
て高周波加熱室３に供給され庫内の食品４を加熱する。
庫内の高周波電界は誘電体板５を介して凹部６内で庫内
に臨むアンテナ７から検波回路８で直流に変換される。
検波信号は制御回路９に導びかれ高周波発振器１の電源
回路10と接続されている。２点鎖線11で囲われた部分は
１枚のプリント基板上に装着される。EXAMPLE FIG. 1 is a block diagram showing a high frequency heating apparatus of the present invention. The radio wave emitted from the high frequency oscillator 1 is supplied to the high frequency heating chamber 3 via the waveguide 2 to heat the food 4 in the refrigerator.
The high frequency electric field in the cabinet is converted into direct current by the detection circuit 8 from the antenna 7 facing the cabinet in the recess 6 via the dielectric plate 5.
The detection signal is guided to the control circuit 9 and connected to the power supply circuit 10 of the high frequency oscillator 1. The part surrounded by the chain double-dashed line 11 is mounted on one printed circuit board.
第２図には、アンテナ７と検波回路８及び制御回路９
の１枚を含むプリント基板の取付け例を示している。プ
リント基板11にはアンテナ７やオペアンプ12などが装着
されている。第３図にはプリント基板11上の回路図、第
４図には実体配置図を示す。In FIG. 2, the antenna 7, the detection circuit 8 and the control circuit 9 are shown.
2 shows an example of mounting a printed circuit board including one of the above. An antenna 7 and an operational amplifier 12 are mounted on the printed board 11. FIG. 3 shows a circuit diagram on the printed circuit board 11, and FIG. 4 shows a physical layout diagram.
図において、検波回路８はアンテナ７、抵抗13、15、
ダイオード16、コンデンサ17からなり、制御回路９の一
部回路である差動増巾平滑回路がオペアンプ12、抵抗1
8、19、20、21、22、コンデンサ23から構成される。抵
抗15の両端電圧を直接１つのプリント基板11上にある制
御回路９の一部に接続しているのでオペアンプ12で小さ
なインピーダンスに変換されるので、電子レンジからの
漏波などによる影響をうけにくい構成が実現できる。凹
部６は開孔が誘電体板５でカバーされ食品から飛散する
油水分が、直接アンテナ７に付着するのを防いでいる。
第５図には、冷凍食品を加熱したときの検波信号Vsの時
間変化例を示している。解凍完了の（ａ）時点、沸騰開
始の（ｂ）時点をさかいに振幅及び、レベルが特徴的に
変化する。制御回路９は、この信号VsをもとにVsのレベ
ルの変曲点や数Hz帯の低周波成分からなる振幅変化をも
とに、高周波発振器１の電源回路10を制御するのであ
る。In the figure, the detection circuit 8 includes an antenna 7, resistors 13 and 15,
The differential amplification smoothing circuit, which is a part of the control circuit 9 and includes a diode 16 and a capacitor 17, is an operational amplifier 12 and a resistor 1.
It is composed of 8, 19, 20, 21, 22 and a capacitor 23. Since the voltage across the resistor 15 is directly connected to a part of the control circuit 9 on one printed circuit board 11, it is converted into a small impedance by the operational amplifier 12, so it is less susceptible to the influence of leakage waves from the microwave oven. The configuration can be realized. The opening of the recess 6 is covered with the dielectric plate 5 to prevent oil and water splashing from food from directly adhering to the antenna 7.
FIG. 5 shows an example of temporal changes in the detection signal V s when frozen food is heated. The amplitude and level characteristically change after the time point (a) at the completion of thawing and the time point (b) at the start of boiling. The control circuit 9 controls the power supply circuit 10 of the high-frequency oscillator 1 based on this signal V s , based on the inflection point of the level of V s and the amplitude change composed of low frequency components in the several Hz band. .
通常はマイクロ波検波用には、テフロン等の高価な低
損失プリント基板、制御回路は安価なエポキシなどのプ
リント基板を用いるが、本発明では伝送電力が小さいこ
と。検波信号Vsの変化が大きいことから、例えば検波回
路も制御回路も一枚のエポキシのプリント基板で実現で
きるのである。Normally, an expensive low-loss printed circuit board such as Teflon is used for microwave detection, and an inexpensive printed circuit board such as epoxy is used for the control circuit. However, in the present invention, the transmission power is small. Since the change of the detection signal V s is large, for example, both the detection circuit and the control circuit can be realized by one epoxy printed board.
発明の効果 本発明によれば、食品の油水分や、庫内からの漏波等
により悪影響を受けず、長期に安定した制御性能が保証
できる高周波加熱装置が実現できる。EFFECTS OF THE INVENTION According to the present invention, it is possible to realize a high-frequency heating device that can be guaranteed stable control performance for a long period of time without being adversely affected by oil moisture of food, leakage waves from the inside of the refrigerator, and the like.
第１図は本発明の一実施例の高周波加熱装置のブロック
図、第２図は同装置のプリント基板の取付を示す断面
図、第３図、第４図は同プリント基板上の回路図及び実
体配置図、第５図は同検波信号の波形図である。 １……高周波発振器、３……加熱室、５……誘電体板、
６……凹部、７……アンテナ、８……検波回路、９……
制御回路、10……電源回路、11……プリント基板。FIG. 1 is a block diagram of a high frequency heating apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing mounting of a printed circuit board of the apparatus, and FIGS. 3 and 4 are circuit diagrams on the printed circuit board. The physical layout diagram and FIG. 5 are waveform diagrams of the same detection signal. 1 ... High frequency oscillator, 3 ... Heating chamber, 5 ... Dielectric plate,
6 ... Recess, 7 ... Antenna, 8 ... Detection circuit, 9 ...
Control circuit, 10 ... power circuit, 11 ... printed circuit board.
Claims (1)
の電力により前記加熱室に供給する高周波発振器と、前
記加熱室内に設けかつ前記加熱室から絶縁されたアンテ
ナと、前記アンテナを保護するために前記加熱室とアン
テナとの間に設けた誘電体板と、前記アンテナで受信し
た高周波を検波する検波回路と、検波した信号に基づい
て制御する制御回路とからなり、前記検波回路、または
前記制御回路の少なくとも１つをプリント基板上に構成
した高周波加熱装置。1. A heating chamber, a power supply circuit, a high-frequency oscillator for supplying electric power from the power supply circuit to the heating chamber, an antenna provided in the heating chamber and insulated from the heating chamber, and the antenna protected. In order to do so, a dielectric plate provided between the heating chamber and the antenna, a detection circuit for detecting the high frequency received by the antenna, and a control circuit for controlling based on the detected signal, the detection circuit, Alternatively, a high frequency heating device in which at least one of the control circuits is formed on a printed circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1097129A JP2563571B2 (en) | 1989-04-17 | 1989-04-17 | High frequency heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1097129A JP2563571B2 (en) | 1989-04-17 | 1989-04-17 | High frequency heating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02275222A JPH02275222A (en) | 1990-11-09 |
| JP2563571B2 true JP2563571B2 (en) | 1996-12-11 |
Family
ID=14183956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1097129A Expired - Lifetime JP2563571B2 (en) | 1989-04-17 | 1989-04-17 | High frequency heating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563571B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6452141B1 (en) * | 2001-06-30 | 2002-09-17 | Samsung Electronics Co., Ltd. | Microwave oven with magnetic field detecting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6073196U (en) * | 1983-10-27 | 1985-05-23 | 株式会社日立ホームテック | High frequency heating device |
-
1989
- 1989-04-17 JP JP1097129A patent/JP2563571B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02275222A (en) | 1990-11-09 |
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