CN203560959U

CN203560959U - Teppanyaki induction cooker

Info

Publication number: CN203560959U
Application number: CN201320738266.7U
Authority: CN
Inventors: 张辉兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-21
Filing date: 2013-11-21
Publication date: 2014-04-23
Anticipated expiration: 2023-11-21

Abstract

The utility model discloses a teppanyaki induction cooker, which comprises a heating wire coil, a frequency modulation circuit and a central controller, wherein the frequency modulation circuit is a symmetric half-bridge LC series circuit which comprises an IGBT (Insulated Gate Bipolar Translator) power tube and a resonant capacitor of an upper bridge boom and an IGBT (Insulated Gate Bipolar Translator) power tube and a resonant capacitor of a lower bridge boom; the upper bridge boom and the heating wire coil as well as the lower bridge boom and the heating wire coil respectively form an oscillation circuit; a driving circuit is connected with each IGBT power tube; the driving circuit of each IGBT power tube is connected with the central controller and the two IGBT work alternatively. The teppanyaki induction cooker disclosed by the utility model adopts the novel symmetric half-bridge LC series circuit, due to the half-bridge circuit work mode, the IGBT is back-pressure-free and not limited by the magnetic distance of the cookware and the wire coil; moreover, the two IGBT of the half-bridge circuit work alternatively, and the power can reach 3500W, so that heating speed is very fast and the heating requirement of the teppanyaki device is fully met.

Description

A kind of tappasaki electromagnetic oven

[technical field]

The utility model relates to a kind of electromagnetic oven.

[background technology]

Electromagnetic oven is the very fast stove and accessory of a kind of firing rate, but conventional domestic electromagnetic oven but cannot be used for making tappasaki.Below its irony pallet of tappasaki utensil, be also lined with the treucher of a thick about 20mm, common electromagnetic oven adopts the working method of single tube excitation formula LC parallel resonance, when the distance of pan off-line dish higher, the back-pressure that IGBT vibration produces is higher, the back-pressure that when power is higher simultaneously, IGBT produces is also higher, so under normal circumstances, pan off-line dish height is 12MM, during power 2000W, IGBT back-pressure reaches 1100VDC high pressure, if increased after the wood of 20MM, that mill back-pressure will be very high, at this moment to select the IGBT of withstand voltage 1600V, and power can only be below 1500W, otherwise will easily puncture IGBT, and power is too low, therefore firing rate is very slow, do not reach the ideal effect of iron plate culinary art.

[summary of the invention]

The purpose of this utility model is to provide a kind of magnetic of pan and drum that is not subject to apart from the tappasaki electromagnetic oven of restriction for above-mentioned technical problem.

Tappasaki electromagnetic oven comprises heating spool rest, FM circuit, central controller, wherein FM circuit is symmetrical expression half-bridge LC series circuit, comprises IGBT power tube and the resonant capacitance of brachium pontis, IGBT power tube and the resonant capacitance of lower brachium pontis, two IGBT power tubes are connected with respectively drive circuit, the alternation of two IGBT power tubes, the drive circuit of IGBT power tube connects central controller, and heating spool rest forms concussion loop with upper brachium pontis and lower brachium pontis respectively.

Described resonant tank is provided with current detection circuit, and current detection signal is connected to the central controller of electromagnetic oven.

Described upper brachium pontis and the IGBT power tube of lower brachium pontis are parallel with respectively Absorption Capacitance.

Between described FM circuit and mains supply, be connected with current rectifying and wave filtering circuit.

Described current rectifying and wave filtering circuit comprises bridge rectifier and is connected in parallel on the filter capacitor of bridge rectifier output.

On described central controller, be connected with firepower adjustment module.

Described central controller is connected with power switch circuit.

The utility model adopts new-type symmetrical expression half-bridge LC series circuit, because half-bridge circuit working method IGBT is without back-pressure, therefore be not subject to the magnetic of pan and drum apart from restriction, half-bridge circuit two-way IGBT alternation in addition, power can be accomplished 3500W, therefore firing rate is very fast, reaches the heating needs of tappasaki utensil completely.

[accompanying drawing explanation]

Accompanying drawing 1 is concussion loop diagram of the present utility model;

Accompanying drawing 2 is enforcement illustrations of the present utility model.

[specific embodiment]

Below in conjunction with the specific embodiment, the utility model is described in further detail.

Symmetrical expression half-bridge LC series circuit as shown in Figure 1, heating spool rest L01, upper brachium pontis IGBT01 and resonance capacitor C 01, lower brachium pontis IGBT02 and resonance capacitor C 02, upper brachium pontis and lower brachium pontis respectively with heating spool rest L01 composition resonant tank, the switch concussion that hockets of upper brachium pontis and lower brachium pontis.The grid of two IGBT power tubes is respectively used to connect drive circuit.

Described electromagnetic oven circuit figure, comprises bridge rectifier DB1, filter capacitor C, heating spool rest L, symmetrical expression half-bridge LC series resonant circuit, MCU as shown in Figure 2.

Wherein, symmetrical expression half-bridge LC series resonant circuit comprises heating spool rest L, upper brachium pontis IGBT1 and resonance capacitor C 1, lower brachium pontis IGBT2 and resonance capacitor C 2, and upper brachium pontis and lower brachium pontis form resonant tank with heating spool rest L respectively, IGBT1 is parallel with capacitive absorption C3, and IGBT2 is parallel with capacitive absorption C4.The grid of IGBT1 and IGBT2 is connected respectively driving chip U1 and U2.Drive chip U1 to be connected MCU with U2.Current detection circuit is installed on resonant tank, and detection signal is connected to MCU, and current detection circuit comprises inductance coil CT2 and rectifier bridge.

MCU is also connected with on-off circuit Y and firepower regulating circuit E.

Alternating current 220V AC is by after bridge rectifier DB1 rectification, then obtains after filtering the direct current of VDD310VDC after capacitor C.MCU receives after start-up command, exports two-way square-wave pulse simultaneously, and two-way pulse is mutual symmetry formula, and frequency is identical, frequency range 20KHZ-60KHZ; Two-way pulse is carried out the conversion of switch work by driving chip U1 and U2 to amplify two power tube IGBT of rear drive upper arm underarm.

Because two-way drive waveforms is complementary drive, therefore upper and lower two IGBT are independent alternations, and both, when IGBT1 conducting, IGBT2 closed, and after IGBT1 closes, IGBT2 just starts conducting.Upper half duty, first when IGBT1 conducting, VDD310VDC charges to resonant capacitance C2 by the IGBT1 load coil L that flows through, at this moment heating spool rest L is upper because there being high frequency electric to flow through, produce induced electromotive force, according to screw law, generate an electromagnetic field, the metal pan in magnetic field above magnetic force line cutting heats; After IGBT1 exits conducting and enters and close, after the Dead Time of 2US, IGBT2 starts conducting, and this VDD310VDC forms back by flow through load coil L and IGBT2 of resonant capacitance C1

Road electric current, completes lower half work; At this moment heating spool rest L produces same induced field, opposite direction, and energy is identical.

This circuit is frequency modulation Power Regulation mode, and the size of power is to be determined by the frequency of two-way pulse, and frequency more high power is less, the lower center resonant frequency that approaches LC of frequency, and power is larger.

On the utility model is described in detail, the above, be only the preferred embodiment of the utility model, do not limit the utility model practical range, be allly according to the application's scope, to do impartial change and modify, all should still belong in the utility model covering scope.

Claims

1. a tappasaki electromagnetic oven, comprise heating spool rest, FM circuit, central controller, is characterized in that: described FM circuit is symmetrical expression half-bridge LC series circuit, comprise IGBT power tube and the resonant capacitance of brachium pontis, IGBT power tube and the resonant capacitance of lower brachium pontis, heating spool rest forms concussion loop with upper brachium pontis and lower brachium pontis respectively, and two IGBT power tubes are connected with respectively drive circuit, the drive circuit of IGBT power tube connects central controller, the alternation of two IGBT power tubes.

2. tappasaki electromagnetic oven according to claim 1, is characterized in that: described resonant tank is provided with current detection circuit, current detection signal is connected to the central controller of electromagnetic oven.

3. electromagnetic oven FM circuit according to claim 1, is characterized in that: described upper brachium pontis and the IGBT power tube of lower brachium pontis are parallel with respectively Absorption Capacitance.

4. electromagnetic oven FM circuit according to claim 1, is characterized in that: between described FM circuit and mains supply, be connected with current rectifying and wave filtering circuit.

5. electromagnetic oven FM circuit according to claim 4, is characterized in that: described current rectifying and wave filtering circuit comprises bridge rectifier and is connected in parallel on the filter capacitor of bridge rectifier output.

6. electromagnetic oven FM circuit according to claim 1, is characterized in that: on described central controller, be connected with firepower adjustment module.

7. electromagnetic oven FM circuit according to claim 1, is characterized in that: described central controller is connected with power switch circuit.