CN202747422U - Variable-frequency microwave oven - Google Patents
Variable-frequency microwave oven Download PDFInfo
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- CN202747422U CN202747422U CN 201120434329 CN201120434329U CN202747422U CN 202747422 U CN202747422 U CN 202747422U CN 201120434329 CN201120434329 CN 201120434329 CN 201120434329 U CN201120434329 U CN 201120434329U CN 202747422 U CN202747422 U CN 202747422U
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- circuit
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- microwave oven
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Abstract
The utility model relates to a variable-frequency microwave oven which comprises a rectification circuit, a switching circuit, a voltage inverter circuit and a double voltage output circuit, which are connected in sequence, wherein the double voltage output circuit is connected with a microwave excitation source, and a current sampling resistor is in series connection between the double voltage output circuit and the microwave excitation source; the microwave excitation source adopts a permatron or a semiconductor power source; the current sampling resistor is connected with a control center of the variable-frequency microwave oven; and the double voltage output circuit is connected with a voltage detection circuit, and the voltage detection circuit is connected with the control center of the variable-frequency microwave oven. A current transformer detection circuit is saved, the manufacturing cost is reduced, the qualification rate of the frequency converter is greatly improved, and the service life of the product is prolonged; and the variable-frequency microwave oven has the characteristics of simple and reasonable structure, low manufacturing cost, low failure rate and long service life.
Description
Technical field
The utility model relates to a kind of frequency-conversion microwave oven.
Background technology
Existing frequency-conversion microwave oven generally all can be provided with current detection circuit in order to control stable output power, sees accompanying drawing 1, traditional electric current detecting method is to adopt independent current transformer circuit to detect, the cost of manufacture of this current transformer circuit is higher, and components and parts are more, and fault rate is higher; And the coil copper wire of current transformer is thin, easily short circuit.
The utility model content
The purpose of this utility model aim to provide a kind of simple and reasonable, cost of manufacture is low, fault is low, the frequency-conversion microwave oven of long service life, to overcome weak point of the prior art.
A kind of frequency-conversion microwave oven by this purpose design, comprise the rectification circuit that joins successively, on-off circuit, voltage inverter circuit and voltage follower circuit doubly, times voltage follower circuit and microwave driving source join, and its architectural feature is to be serially connected with current sampling resistor between times voltage follower circuit and the microwave driving source.
Described microwave driving source is magnetron or semiconductor power source.
The control centre of described current sampling resistor and frequency-conversion microwave oven joins.
Described times of voltage follower circuit comprises transformer, capacitor C 9, capacitor C 10, diode D4 and diode D3, consist of the first circuit after capacitor C 9 and capacitor C 10 serial connections, consist of second circuit after diode D4 and the diode D3 serial connection, end after the first circuit and the second circuit parallel connection is connected in series with current sampling resistor, the first circuit and other end output-4000V after second circuit is in parallel, one termination of transformer enters between capacitor C 9 and the capacitor C 10, between the other end of transformer access diode D4 and the diode D3.
Described times of voltage follower circuit and voltage detecting circuit join, and the control centre of voltage detecting circuit and frequency-conversion microwave oven joins.
The utility model according to the microwave driving source operating voltage characteristic of micro-wave oven (4000V), at the output series current sampling resistor of times voltage follower circuit of frequency converter; The current sampling resistor of must flowing through when electric current flows through microwave driving source then just forms certain voltage drop at the current sampling resistor place; The size of voltage drop is proportional to the size of the electric current that flows through microwave driving source; By detecting this magnitude of voltage size, just be equivalent to detect the current value size of microwave driving source; The control centre of frequency-conversion microwave oven just can control the output current size based on this current value, and then controls stable power stage.
The utlity model has and saved the current transformer testing circuit, reduced cost of manufacture, and greatly improve the qualification rate of frequency converter, prolonged the service life of product.
The utlity model has simple and reasonable, cost of manufacture is low, fault is low, the characteristics of long service life.
Description of drawings
Fig. 1 connects block diagram for the circuit of existing frequency-conversion microwave oven.
Fig. 2 is that the circuit of the utility model one embodiment connects block diagram.
Fig. 3 is local circuit connection diagram of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Referring to Fig. 2-Fig. 3, this frequency-conversion microwave oven, comprise the rectification circuit that joins successively, on-off circuit, voltage inverter circuit and voltage follower circuit doubly, times voltage follower circuit and microwave driving source join, and are serially connected with current sampling resistor ib between times voltage follower circuit and the microwave driving source.
In the present embodiment, microwave driving source both can be magnetron, can be the semiconductor power source again.The control centre of current sampling resistor ib and frequency-conversion microwave oven joins.
Times voltage follower circuit and voltage detecting circuit join, and the control centre of voltage detecting circuit and frequency-conversion microwave oven joins.
Times voltage follower circuit comprises transformer T, capacitor C 9, capacitor C 10, diode D4 and diode D3, consist of the first circuit after capacitor C 9 and capacitor C 10 serial connections, consist of second circuit after diode D4 and the diode D3 serial connection, end after the first circuit and the second circuit parallel connection is connected in series with current sampling resistor ib, the first circuit and other end output-4000V after second circuit is in parallel, the termination of transformer T enters between capacitor C 9 and the capacitor C 10, between the other end of transformer T access diode D4 and the diode D3.
Claims (5)
1. frequency-conversion microwave oven, comprise the rectification circuit that joins successively, on-off circuit, voltage inverter circuit and voltage follower circuit doubly, times voltage follower circuit and microwave driving source join, and it is characterized in that being serially connected with between times voltage follower circuit and the microwave driving source current sampling resistor (ib).
2. frequency-conversion microwave oven according to claim 1 is characterized in that described microwave driving source is magnetron or semiconductor power source.
3. frequency-conversion microwave oven according to claim 1 is characterized in that the control centre of described current sampling resistor (ib) and frequency-conversion microwave oven joins.
4. frequency-conversion microwave oven according to claim 1, it is characterized in that described times of voltage follower circuit comprises transformer (T), capacitor C 9, capacitor C 10, diode D4 and diode D3, consist of the first circuit after capacitor C 9 and capacitor C 10 serial connections, consist of second circuit after diode D4 and the diode D3 serial connection, end after the first circuit and the second circuit parallel connection is connected in series with current sampling resistor (ib), the first circuit and other end output-4000V after second circuit is in parallel, one termination of transformer (T) enters between capacitor C 9 and the capacitor C 10, between the other end of transformer (T) access diode D4 and the diode D3.
5. according to claim 1 to 4 arbitrary described frequency-conversion microwave ovens, it is characterized in that described times of voltage follower circuit and voltage detecting circuit join, the control centre of voltage detecting circuit and frequency-conversion microwave oven joins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120434329 CN202747422U (en) | 2011-11-05 | 2011-11-05 | Variable-frequency microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120434329 CN202747422U (en) | 2011-11-05 | 2011-11-05 | Variable-frequency microwave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202747422U true CN202747422U (en) | 2013-02-20 |
Family
ID=47706812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120434329 Expired - Lifetime CN202747422U (en) | 2011-11-05 | 2011-11-05 | Variable-frequency microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202747422U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401403A (en) * | 2011-11-05 | 2012-04-04 | 美的集团有限公司 | Frequency conversion microwave oven |
-
2011
- 2011-11-05 CN CN 201120434329 patent/CN202747422U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401403A (en) * | 2011-11-05 | 2012-04-04 | 美的集团有限公司 | Frequency conversion microwave oven |
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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 | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 528311, Guangdong, Foshan Town, Shunde District, Beijiao, 6 beautiful avenue, beautiful headquarters building, B District, 26 - 28 floor Patentee after: Midea Group Co., Ltd. Patentee after: Guangdong Midea Kitchen Appliance Manufacturing Co., Ltd. Address before: 528311, Guangdong, Foshan Town, Shunde District, Beijiao, 6 beautiful avenue, beautiful headquarters building, B District, 26 - 28 floor Patentee before: Midea Group Co., Ltd. Patentee before: Guangdong Midea Microwave Electrical Appliance Manufacturing Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130220 |