CN2682971Y - Electromagnetic cooking apparatus heating coil full bridge drive circuit - Google Patents
Electromagnetic cooking apparatus heating coil full bridge drive circuit Download PDFInfo
- Publication number
- CN2682971Y CN2682971Y CN 200420007498 CN200420007498U CN2682971Y CN 2682971 Y CN2682971 Y CN 2682971Y CN 200420007498 CN200420007498 CN 200420007498 CN 200420007498 U CN200420007498 U CN 200420007498U CN 2682971 Y CN2682971 Y CN 2682971Y
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- China
- Prior art keywords
- circuit
- full bridge
- output
- high frequency
- heater coil
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- Expired - Lifetime
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Abstract
The utility model discloses an electromagnetic cooking apparatus heating coil full bridge drive circuit, which comprises control signal circuit, rectification circuit, resonant capacitances, and a high-frequency electron switch; the control end of the high-frequency electron switch is connected with the output end of the control signal circuit M, and both ends of each high-frequency electron switches are connected with the resonant capacitance in parallel; the high-frequency electron switch and the resonant capacitance connected with the high-frequency electron switch in parallel are provided with four groups to form the full bridge circuit. The two input ends of the full bridge circuit are respectively connected with the output ends of the rectification circuit, and the electromagnetic coil L of an electromagnetic stove and the coil resonant capacitance are connected between the output end of the full bridge circuit. The full bridge circuit of the utility model can make the return circuit of the electromagnetic coil form via the two relative arms of the full bridge; in virtue of the large capacitance of the high-frequency electron switch which forms the full bridge, the driving power is increased and the power can be increased more than one time for satisfying the request of a large-sized cooking device.
Description
Technical field
The utility model relates to the electromagnetism cooking device, specifically is a kind of full bridge driving circuit of electromagnetism cooking device heater coil.
Background technology
Prior art is that I am disclosed a kind of electromagnetic stove drive circuit in the utility model patent of (20032010.3) in the patent No., this drive circuit constitutes half-bridge circuit by two high frequency electronic switch and the resonant capacitance in parallel with it, their mid point is connected with an end of heater coil, is connected with the mid point that is connected in two filter capacitors between the rectification circuit output end behind resonant capacitance of heater coil polyphone.Because the operating current of heater coil so limited operating current, can not satisfy the power requirement of large-scale cooking device by described filter capacitor.
Summary of the invention
The purpose of this utility model just provides a kind of electromagnetism cooking device heater coil full bridge driving circuit, solving the low problem of heating power that existing electromagnetic stove drive circuit exists, and can reduce the requirement of withstand voltage to the rectified power pipe.
The technical solution of the utility model is: comprise control signal circuit M, rectification circuit, resonant capacitance and high frequency electronic switch, the control end of high frequency electronic switch is connected with the output of control signal circuit M, high frequency electronic switch is connected in the output loop of rectification circuit, each resonant capacitance in parallel at the two ends of each high frequency electronic switch, it is characterized in that: described rectification circuit comprises rectifier bridge V and the filter capacitor C1 that connects with its output; Described high frequency electronic switch and the resonant capacitance in parallel with it are 4 groups, form full bridge inverter, two inputs of this full bridge inverter are connected with the output of described rectification circuit respectively, connect described electromagnetism cooking device heater coil and coil resonance electric capacity between the output of this full-bridge circuit.
Drive circuit also can be of coupled connections by transformer B and described heater coil.
Be in series with temperature detect switch (TDS) TK and the current-limiting resistance R in parallel in the output loop of described rectification circuit with it.
The circuit of full-bridge of the present utility model, the loop that makes solenoid is made of two relative arms of full-bridge, has very big capacity owing to constitute the high frequency electronic switch of full-bridge, has increased driving power greatly, the above power that can double has satisfied the requirement of large-scale cooking device.Gauge tap TK is in parallel with resistance also can to reduce the circuit turn-on initial stage because the charging of each electric capacity to the rush of current of rectified power pipe, has reduced its requirement of withstand voltage.
Description of drawings
Fig. 1 is a circuit structure diagram of the present utility model;
Fig. 2 is the another kind of embodiment circuit diagram in heater coil loop;
Fig. 3 is a kind of embodiment circuit diagram that the heater coil loop is connected with transformer;
Fig. 4 is the another kind of embodiment circuit diagram that the heater coil loop is connected with transformer.
The specific embodiment
Referring to Fig. 1, the rectification circuit that the utility model comprises control signal circuit M, be made up of three-phase commutation bridge V and filter capacitor C1,4 high frequency electronic switch K1～K4 and with one one corresponding 4 resonant capacitance C2～C5 in parallel.Described 4 high frequency electronic switch K1～K4 and resonance capacitor C 2～C5 form full bridge inverter, two inputs of this full-bridge circuit are connected with the output of described rectification circuit respectively, connect the solenoid L of electromagnetic stove and the coil resonance capacitor C 6 of series connection with it between the output of this full-bridge circuit.The control end of described each high frequency electronic switch K1～K4 is connected with 4 outputs of described control signal circuit M respectively.
Gauge tap TK and the current-limiting resistance R in parallel with it also can connect in the output loop of described rectification circuit.
When powerful device was selected design for use, C2, C3, C4, C5 can be formed in parallel by a plurality of respectively electric capacity.C6 also can be formed by a plurality of electric capacity series and parallels.
Heater coil L and capacitances in series can adopt connected mode shown in Figure 2, and a capacitor C 6 and C7 promptly respectively connect at the two ends of coil L.The characteristics of this connected mode are when the heater coil shorted to earth, and the rectified power pipe is had the certain protection effect.Simultaneously, this balance output can also reduce the voltage-to-ground of heater coil.
Heater coil L also can link to each other with resonant capacitance by transformer B, and as shown in Figure 3, Figure 4, the characteristics of this mode are the conversion that can realize isolating with power, the on state current of reduction Ground leakage current and HF switch.
The high frequency electronic switch K1 of this embodiment～K4 adopts IGBT module, parallel resonance electric capacity between the E of each IGBT utmost point and the C utmost point.
The operation principle of this circuit is: rectification circuit is powered to bridge inverter main circuit by gauge tap TK after alternating current is become direct current, during energising just, switch TK disconnects, charge to filter capacitor C1 by charging resistor R, when C1 is charged to normal voltage, switch TK conducting is powered to bridge inverter main circuit.Its objective is that protection rectifying tube and filter capacitor C1 avoid starting impact.Control circuit sends Continuity signal to K1, K2, K3, K4 in turn according to working condition, and K1 and K2 are with K3 and K4 alternate conduction.C2, C3, C4, C5, C6 and heater coil L form resonant tank, thereby produce high frequency electric in heater coil L.This high frequency electric induces eddy current in ferrous material, ferrous material generates heat under eddy current effect.C2, C3, C4, C5 have the circuit cushioning effect simultaneously, greatly reduce the high-frequency loss of switch.The advantage of full bridge inverter is the requirement of withstand voltage of cpable of lowering power pipe, and bigger operating current can be provided.
Claims (3)
1, a kind of electromagnetism cooking device heater coil full bridge driving circuit, comprise control signal circuit M, rectification circuit, resonant capacitance and high frequency electronic switch, the control end of high frequency electronic switch is connected with the output of control signal circuit M, high frequency electronic switch is connected in the output loop of rectification circuit, each resonant capacitance in parallel at the two ends of each high frequency electronic switch, it is characterized in that: described rectification circuit comprises rectifier bridge V and the filter capacitor C1 that connects with its output; Described high frequency electronic switch and the resonant capacitance in parallel with it are 4 groups, form full bridge inverter, two inputs of this full bridge inverter are connected with the output of described rectification circuit respectively, connect the coil resonance electric capacity of described electromagnetism cooking device heater coil and series connection with it between the output of this full-bridge circuit.
2, electromagnetism cooking device heater coil full bridge driving circuit according to claim 1, it is characterized in that: drive circuit also can be of coupled connections by transformer and described heater coil.
3, electromagnetism cooking device heater coil full bridge driving circuit according to claim 1 and 2 is characterized in that: be in series with gauge tap TK and the current-limiting resistance R in parallel with it in the output loop of described rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420007498 CN2682971Y (en) | 2004-03-24 | 2004-03-24 | Electromagnetic cooking apparatus heating coil full bridge drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420007498 CN2682971Y (en) | 2004-03-24 | 2004-03-24 | Electromagnetic cooking apparatus heating coil full bridge drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2682971Y true CN2682971Y (en) | 2005-03-09 |
Family
ID=34605994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420007498 Expired - Lifetime CN2682971Y (en) | 2004-03-24 | 2004-03-24 | Electromagnetic cooking apparatus heating coil full bridge drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2682971Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257742B (en) * | 2008-02-01 | 2011-01-12 | 卢伟文 | High frequency heating device |
| CN102724777A (en) * | 2012-05-24 | 2012-10-10 | 佛山市顺德区美的电热电器制造有限公司 | Resonant circuit of electromagnetic oven |
-
2004
- 2004-03-24 CN CN 200420007498 patent/CN2682971Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257742B (en) * | 2008-02-01 | 2011-01-12 | 卢伟文 | High frequency heating device |
| CN102724777A (en) * | 2012-05-24 | 2012-10-10 | 佛山市顺德区美的电热电器制造有限公司 | Resonant circuit of electromagnetic oven |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140324 Granted publication date: 20050309 |