CN204190963U - Electromagnetic heating circuit for preventing vibration from being stopped - Google Patents
Electromagnetic heating circuit for preventing vibration from being stopped Download PDFInfo
- Publication number
- CN204190963U CN204190963U CN201420573355.5U CN201420573355U CN204190963U CN 204190963 U CN204190963 U CN 204190963U CN 201420573355 U CN201420573355 U CN 201420573355U CN 204190963 U CN204190963 U CN 204190963U
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- Prior art keywords
- circuit
- electromagnetic heating
- resonant circuit
- voltage
- electronic device
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000010355 oscillation Effects 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000006698 induction Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model provides a prevent electromagnetic heating circuit that shakes, include the mains supply rectifier circuit with mains connection, the last filtering freewheel circuit, resonance circuit, IGBT and drive circuit, the controller circuit of having connected gradually of mains supply rectifier circuit, be connected with synchronizing signal sampling circuit between resonance circuit and the controller circuit, resonance circuit's input is connected with the direct current voltage biasing circuit who provides a short-lived bias voltage for resonance circuit during the alternating current zero passage. The utility model has the advantages that: the circuit is simple and reliable, the cost is low, the anti-jamming capability is strong, and the gap heating of the induction cooker is effectively prevented.
Description
Technical field
The utility model relates to a kind of machine for kitchen use circuit, especially a kind of electromagnetic heating circuit preventing failure of oscillation of electromagnetic oven.
Background technology
Clean due to electromagnetic oven, high energy efficiency is gradually by everybody accreditation, and electromagnetic oven is very universal.Along with the raising of living standards of the people, household electrical appliance get more and more, and when various electrical equipment works simultaneously, can cause certain pollution to electrical network.Household induction cooker, adopts single tube resonant circuit mostly.The electromagnetic oven of this mode, the voltage detecting energy storage coil two ends with sync comparator realizes IGBT, and namely the zero passage of insulated gate bipolar transistor is open-minded.If the damage ratio of electrical network is comparatively large, when civil power crosses 0 position, sync comparator possibly cannot normally overturn, and cannot produce the triggering signal opening IGBT, causes electromagnetic oven failure of oscillation and gap is heated.
The scheme of current existing solution failure of oscillation, mainly increase exchanges electricity zero cross detection circuit, sample zero cross signal by zero cross detection circuit and be supplied to controller, during alternating current zero passage, force output one triggering signal to make IGBT open-minded by this testing circuit.
The electromagnetic heating circuit of single tube resonance, increases zero cross detection circuit, zero cross signal detected, adopt the mode of forced-triggered during zero cross signal, prevent resonant circuit failure of oscillation, this existing method preventing failure of oscillation, requires high to hardware circuit.If the reaction of this circuit is slow, also easily produce extra noise.
Summary of the invention
The utility model provides the electromagnetic heating circuit preventing failure of oscillation that a kind of circuit is simple and reliable, with low cost, antijamming capability by force, effectively prevents electromagnetic oven gap from heating.
The technical solution adopted in the utility model is:
A kind of electromagnetic heating circuit preventing failure of oscillation, comprise the commercial power rectification circuit be electrically connected with city, described commercial power rectification circuit is connected with filtering freewheeling circuit, resonant circuit, IGBT and drive circuit, controller circuitry in turn, be connected with synchronizing signal sample circuit between described resonant circuit and controller circuitry, it is characterized in that: the input of described resonant circuit is connected with the DC voltage bias circuit providing an of short duration bias voltage during alternating current zero passage to resonant circuit.The utility model increases a DC voltage bias circuit by one end of the resonant circuit on electromagnetic heating circuit, this DC voltage bias circuit is during alternating current zero passage, an of short duration bias voltage is provided to resonant circuit, ensure that synchronizing signal sample circuit can work normally, prevent electromagnetic oven gap from heating.
Further, described DC voltage bias circuit comprises a high speed diode D11, and the described negative pole of high speed diode D11 is connected with the input of resonant circuit, and its positive pole and its electronic device of protection are connected, and described electronic device is connected with power vd D.Power vd D is the operating voltage of chip, for other components and parts provide voltage.
Further, described electronic device comprises the current-limiting resistance R11 and speed-up capacitor C11 that are connected in parallel.
The utility model is during mains electricity zero passage, the power vd D of DC voltage bias circuit provides certain direct voltage to the input of resonant circuit by speed-up capacitor C11, high speed diode D11, this voltage is utilized to enable the inductance L 2 on resonant circuit and electric capacity C2 maintain resonance, ensure that synchronizing signal sample circuit can sample the change of inductance L 2 both end voltage polarity, thus the IGBT produced on continuous print triggering signal guarantee IGBT and drive circuit is open-minded, prevent the generation of failure of oscillation, avoid electromagnetic oven gap to heat.When after civil power zero crossing, the voltage of high speed diode D11 negative pole is higher than positive pole, and high speed diode D11 is in by state, now, the electric energy of the storage on speed-up capacitor C11 is discharged by current-limiting resistance R11, and when ensureing next civil power zero crossing, speed-up capacitor C11 effectively can provide energy again.
The beneficial effects of the utility model are: circuit is simple and reliable, with low cost, antijamming capability by force, effectively prevents electromagnetic oven gap from heating.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model covers all alternatives, improvement project and the equivalents that may comprise in Claims scope.
With reference to Fig. 1, a kind of electromagnetic heating circuit preventing failure of oscillation, comprise the commercial power rectification circuit 1 be electrically connected with city, described commercial power rectification circuit 1 is connected with filtering freewheeling circuit 2, resonant circuit 3, IGBT and drive circuit 4, controller circuitry 6 in turn, be connected with synchronizing signal sample circuit 5 between described resonant circuit 3 and controller circuitry 6, the input of described resonant circuit 3 is connected with the DC voltage bias circuit 7 providing an of short duration bias voltage during alternating current zero passage to resonant circuit 3.The utility model increases a DC voltage bias circuit 7 by one end of the resonant circuit 3 on electromagnetic heating circuit, this DC voltage bias circuit 7 is during alternating current zero passage, an of short duration bias voltage is provided to resonant circuit 3, ensure that synchronizing signal sample circuit 5 can work normally, prevent electromagnetic oven gap from heating.
DC voltage bias circuit 7 described in the utility model comprises a high speed diode D11, and the negative pole of described high speed diode D11 is connected with the input of resonant circuit 3, and its positive pole and its electronic device of protection are connected, and described electronic device is connected with power vd D.Power vd D is the operating voltage of chip, for other components and parts provide voltage.
Electronic device described in the present embodiment comprises the current-limiting resistance R11 and speed-up capacitor C11 that are connected in parallel.Electronic device also can be that other can protect the electronic device of high speed diode D11.
The utility model is during mains electricity zero passage, the power vd D of DC voltage bias circuit 7 provides certain direct voltage to the input of resonant circuit 3 by speed-up capacitor C11, high speed diode D11, this voltage is utilized to enable the inductance L 2 on resonant circuit 3 and electric capacity C2 maintain resonance, ensure that synchronizing signal sample circuit 5 can sample the change of inductance L 2 both end voltage polarity, thus the IGBT produced on continuous print triggering signal guarantee IGBT and drive circuit 4 is open-minded, prevent the generation of failure of oscillation, avoid electromagnetic oven gap to heat.When after civil power zero crossing, the voltage of high speed diode D11 negative pole is higher than positive pole, and high speed diode D11 is in by state, now, the electric energy of the storage on speed-up capacitor C11 is discharged by current-limiting resistance R11, and when ensureing next civil power zero crossing, speed-up capacitor C11 effectively can provide energy again.
Claims (3)
1. one kind prevents the electromagnetic heating circuit of failure of oscillation, comprise the commercial power rectification circuit be electrically connected with city, described commercial power rectification circuit is connected with filtering freewheeling circuit, resonant circuit, IGBT and drive circuit, controller circuitry in turn, be connected with synchronizing signal sample circuit between described resonant circuit and controller circuitry, it is characterized in that: the input of described resonant circuit is connected with the DC voltage bias circuit providing an of short duration bias voltage during alternating current zero passage to resonant circuit.
2. a kind of electromagnetic heating circuit preventing failure of oscillation according to claim 1; it is characterized in that: described DC voltage bias circuit comprises a high speed diode D11; the described negative pole of high speed diode D11 is connected with the input of resonant circuit; its positive pole and its electronic device of protection are connected, and described electronic device is connected with power vd D.
3. a kind of electromagnetic heating circuit preventing failure of oscillation according to claim 2, is characterized in that: described electronic device comprises the current-limiting resistance R11 and speed-up capacitor C11 that are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573355.5U CN204190963U (en) | 2014-09-30 | 2014-09-30 | Electromagnetic heating circuit for preventing vibration from being stopped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573355.5U CN204190963U (en) | 2014-09-30 | 2014-09-30 | Electromagnetic heating circuit for preventing vibration from being stopped |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204190963U true CN204190963U (en) | 2015-03-04 |
Family
ID=52622926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420573355.5U Expired - Fee Related CN204190963U (en) | 2014-09-30 | 2014-09-30 | Electromagnetic heating circuit for preventing vibration from being stopped |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204190963U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951910A (en) * | 2017-12-21 | 2019-06-28 | 佛山市顺德区美的电热电器制造有限公司 | The drive control circuit and drive control method of electromagnetic heating system and its IGBT |
-
2014
- 2014-09-30 CN CN201420573355.5U patent/CN204190963U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951910A (en) * | 2017-12-21 | 2019-06-28 | 佛山市顺德区美的电热电器制造有限公司 | The drive control circuit and drive control method of electromagnetic heating system and its IGBT |
| CN109951910B (en) * | 2017-12-21 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and IGBT drive control circuit and drive control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 |