CN108207046A - Surge protection circuit, electromagnetic heater and household electrical appliance - Google Patents
Surge protection circuit, electromagnetic heater and household electrical appliance Download PDFInfo
- Publication number
- CN108207046A CN108207046A CN201611178701.XA CN201611178701A CN108207046A CN 108207046 A CN108207046 A CN 108207046A CN 201611178701 A CN201611178701 A CN 201611178701A CN 108207046 A CN108207046 A CN 108207046A
- Authority
- CN
- China
- Prior art keywords
- capacitance
- varistor
- protection circuit
- choke coil
- surge protection
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- 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.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
Abstract
The present invention relates to field of circuit technology, disclose a kind of surge protection circuit, electromagnetic heater and household electrical appliance.The surge protection circuit includes：Choke coil, varistor and Absorption Capacitance, wherein choke coil and varistor are connected between two input terminals of exchange, and Absorption Capacitance is in parallel with varistor and the indirect load at the both ends of varistor.Pass through above-mentioned technical proposal; surge peak value is dragged down using choke coil; varistor can drag down the crest voltage at Absorption Capacitance both ends simultaneously, so that surge peak value is effectively reduced after the surge protection circuit by being made of choke coil, varistor and Absorption Capacitance.
Description
Technical field
The present invention relates to field of circuit technology, and in particular, to a kind of surge protection circuit, electromagnetic heater and family
Electrical appliance.
Background technology
In electromagnetic heating system, surge is to insulated gate bipolar transistor (Insulated Gate Bipolar
Transistor, IGBT), bridge heap, storage capacitor has huge damage risk.Because surge is to the damage accounting electromagnetic heating system of device
System repair ratio about 1/2.
Fig. 1 shows a kind of circuit with surge protection circuit provided in the prior art.As shown in Figure 1, exchange
Parallel connection varistor RZ131 and Absorption Capacitance C131 between two input terminals, then two exchanges of connecting bridge heap U1 are defeated respectively
Enter end.The output terminal connection choke coil L101 of parallel filtering capacitance C101 between two output terminals of bridge heap U1, bridge heap U1,
Storage capacitor in parallel between the free end of the connection of another output terminal constantan wire RC101, choke coil L101 and constantan wire RC101
C102 and electromagnetic heating circuit, the electromagnetic heating circuit include the power device connected with coil panel L102 in parallel and resonant capacitance
Part IGBT.
Fig. 2 shows multiple sample points in the circuit shown in Fig. 1 in the case that there are the voltage waveforms of surge.Wherein,
(1) it is surge waveform；(2)/(2.1) for surge by varistor RZ131 and Absorption Capacitance C131 treated reach bridge
The waveform of heap U1, peak value are less than waveform (1)；(2.3)/(2.4) are waveform of the surge after gap bridge heap U1, and peak value is equal to waveform
(2) and (2.1) subtract bridge heap pressure difference；(3) waveform of storage capacitor C102 is reached by choke coil L101 for surge；(3.1) it is
Surge first half, because choke coil L101 is every the straight effect of traffic so that the half part crest voltage is less than waveform (2.3) or wave
Shape (2.4) peak value；(3.2) it is surge latter half, because choke coil L101 and storage capacitor C102 forms a booster circuit so that
The current potential of storage capacitor C102 is lifted rapidly, and peak value is higher than (2.3) and (2.4) peak value, even higher than the current potential peak value of (1).This
Kind high-pressure peak, certain latent lesion is caused to rear class device reliability.
Therefore, how to reduce surge becomes urgent problem to be solved in this field to device impact.
Invention content
The object of the present invention is to provide a kind of equipment, which can effectively eliminate surge impact, protect back-end circuit.
To achieve these goals, the present invention provides a kind of surge protection circuit, which includes：First grips
Stream circle, varistor and the first capacitance, wherein that two exchanged are connected on the varistor is defeated for first choke coil
Between entering end, first capacitance is in parallel with the varistor and the indirect load at the both ends of the varistor.
Optionally, which further includes the second choke coil, wherein first choke coil, the varistor
And second choke coil is sequentially connected in series between two input terminals of the exchange.
Optionally, first choke coil is connected between the firewire input terminal of the exchange and the varistor.
Optionally, which further includes protective tube, the protective tube be connected on first choke coil with it is described
Between the firewire input terminal of exchange.
Optionally, first choke coil is connected between the zero curve input terminal of the exchange and the varistor.
Another aspect of the present invention provides a kind of electromagnetic heater, which includes above-mentioned wave
It gushes protection circuit, bridge heap and electromagnetism and circuit occurs, wherein the both ends of the varistor connect two of the bridge heap respectively
Input terminal, the second capacitance of connecting between two output terminals of the bridge heap；
Wherein described electromagnetism occurs circuit and includes：Second capacitance, third capacitance, the 4th capacitance, coil panel, constantan wire
And power device, wherein an output terminal of the bridge heap connects the constantan wire, another output terminal of the bridge heap and
It connects between the free end of the constantan wire third capacitance；4th capacitance and the power device are connected on described the
Between the both ends of three capacitances, the coil panel is in parallel with the 4th capacitance.
Optionally, the capacitance of first capacitance is less than the capacitance of the third capacitance.
Optionally, the value range of the capacitance of first capacitance and second capacitance is 0.1-1 μ F；It is and described
The value range of the capacitance of third capacitance is 2-10 μ F.
Another aspect of the invention additionally provides a kind of household electrical appliance, which includes above-mentioned surge protection
Circuit.
Another aspect of the invention additionally provides a kind of household electrical appliance, which includes above-mentioned electromagnetic heating
Device.
Through the above technical solutions, surge peak value is dragged down using choke coil, while varistor can drag down the first electricity
Hold the crest voltage at both ends, so that surge peak value is in the surge by being made of choke coil, varistor and the first capacitance
It is effectively reduced after protection circuit.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention, but be not construed as limiting the invention together.In the accompanying drawings：
Fig. 1 is a kind of circuit composition schematic diagram with surge protection circuit provided in the prior art；
Fig. 2 shows multiple sample points in the circuit shown in Fig. 1 in the case that there are the voltage waveforms of surge；
Fig. 3 is the surge protection circuit structure diagram that embodiment of the present invention provides；
Fig. 4 is the electromagnetic heater structure diagram that embodiment of the present invention provides；
Fig. 5 shows in the circuit of the electromagnetic heater shown in Fig. 4 multiple sample points in the case that there are surges
Voltage waveform.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
Fig. 3 is the surge protection circuit structure diagram that embodiment of the present invention provides.As shown in figure 3, the present invention provides
A kind of surge protection circuit, the surge protection circuit include：Choke coil L101, varistor RZ131 and capacitance C131 (examples
Such as, Absorption Capacitance C131), wherein choke coil L101 and varistor RZ131 are connected between two input terminals of exchange, are absorbed
Capacitance C131 is in parallel with varistor RZ131 and the indirect load at the both ends of varistor RZ131.
Through the above technical solutions, surge peak value is dragged down using choke coil, while varistor can drag down absorption electricity
Hold the crest voltage at both ends, so that surge peak value is in the surge by being made of choke coil, varistor and Absorption Capacitance
It is effectively reduced after protection circuit.
In embodiments, can one choke coil be respectively set at the both ends of exchange, to realize that better surge peak value is drawn
Inefficient fruit.For example, the surge protection circuit that embodiment of the present invention provides can also include choke coil L103, wherein choke coil
L101, varistor RZ131 and choke coil L103 can be sequentially connected in series between two input terminals of exchange.
In embodiments, can choke coil be set in both ends Zhong Jin one end of exchange, for example, above-mentioned surge protection circuit
In, choke coil (for example, choke coil L101) can be connected on to the firewire input terminal ACL and varistor RZ131 of the exchange
Between.
It, optionally, can be by choke coil (for example, chokes in above-mentioned surge protection circuit in interchangeable embodiment
Circle L103) it is connected between the zero curve input terminal ACN of the exchange and varistor RZ131.
In embodiments, in order to further protect circuit, above-mentioned surge protection circuit can also include protective tube
FUSE131, protective tube FUSE131 can be connected between choke coil L101 and the firewire input terminal ACL exchanged.
Fig. 4 is the electromagnetic heater structure diagram that embodiment of the present invention provides.As shown in figure 4, the reality of the present invention
The mode of applying provides a kind of electromagnetic heater, which includes surge protection circuit as shown in Figure 3, further includes
Circuit occurs for bridge heap U1 and electromagnetism, and the wherein both ends of varistor RZ131 can distinguish two input terminals of connecting bridge heap U1,
Series capacitance C101 between two output terminals of the bridge heap U1；
Circuit, which occurs, for wherein described electromagnetism to include：Capacitance C101 (for example, filter capacitor C101), capacitance C102 (examples
Such as, storage capacitor C102), capacitance C103 (for example, resonant capacitance C103), coil panel L102, constantan wire RC101 and power device
The output terminal connection constantan wire RC101 of part IGBT, jackshaft heap U1, another output terminal and constantan wire of bridge heap U1
Series capacitance C102 between the free end of RC101；Capacitance C103 and power device IGBT are connected between the both ends of capacitance C102,
Coil panel L102 is in parallel with capacitance C103.
In embodiments, the capacitance of capacitance C131 can be less than the capacitance of capacitance C102.For example, capacitance C131 and
The value range of the capacitance of capacitance C101 can be 0.1-1 μ F, and the value range of the capacitance of capacitance C102 can be 2-10 μ
F。
Fig. 5 shows in the circuit of the electromagnetic heater shown in Fig. 4 multiple sample points in the case that there are surges
Voltage waveform.Exist as shown in figure 5, capacitance C102 can be greatly lowered with circuit shown in FIG. 1 in electromagnetic heater shown in Fig. 4
Surge carrys out interim crest voltage, so as to reduce resonator system (being made of capacitance C103 and coil panel L102) and power below
The pressure of pipe IGBT.
As shown in figure 4, (1) is surge waveform (being herein citing or other shapes waveform)；(4) it is passed through for surge
After crossing choke coil L101 or (L103) limitation, using varistor RZ131 containments and the wave after capacitance C131 absorptions
Shape；
(4.1) it is surge first half, because choke coil L101 is every the straight effect of traffic so that (4.1) portion waveshape is relatively low；
(4.2) it is surge latter half, because choke coil L101 and capacitance C131 constitutes a booster circuit, but it is pressure-sensitive
Resistance RZ131 is close to capacitance C131, can force aerial drainage to exceeding varistor RZ131 limitations point voltage so that (4.2) waveform
Far smaller than (1), simultaneously as capacitance C131 is Absorption Capacitance, capacitance is much smaller compared to capacitance C102, therefore is stored in capacitance
Energy on C131 is much smaller on capacitance C102 compared to being stored in；And
(5) it is waveform of the surge after gap bridge heap U1, peak value subtracts bridge heap node voltage equal to waveform (4).
It can be seen that electromagnetic heater shown in Fig. 4 has good protective effect to bridge heap U1, because choke coil L101 (or
L103) surge peak value is dragged down, while the resonant tank that choke coil L101 and capacitance C131 is formed causes on capacitance C131
Energy it is smaller, and sub- quick resistance RZ131 can preferably drag down the crest voltage on capacitance C131 so that (4) current potential at
Far below the current potential at (2), so as to preferably protect bridge heap U1.
Embodiments of the present invention additionally provide a kind of household electrical appliance, which includes above-mentioned surge protection electricity
Road.Embodiments of the present invention additionally provide a kind of household electrical appliance, which includes above-mentioned electromagnetic heater.Household
Electric appliance can be electromagnetic oven, or electric cooker, electric pressure cooking saucepan, electric cooking pot, soy bean milk making machine, coffee machine, washing machine, refrigerator are empty
It adjusts, smoke exhaust ventilator, electric heater, water dispenser, dust catcher, blender etc..
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of surge protection circuit, which is characterized in that the surge protection circuit includes：
First choke coil, varistor and the first capacitance, wherein first choke coil and the varistor are connected on friendship
Between two input terminals of stream, first capacitance is in parallel with the varistor and the both ends of the varistor between
Connect load.
2. surge protection circuit according to claim 1, which is characterized in that the surge protection circuit further includes the second chokes
Circle, wherein first choke coil, the varistor be sequentially connected in series with second choke coil it is defeated in two exchanged
Enter between end.
3. surge protection circuit according to claim 1, which is characterized in that first choke coil is connected on the exchange
Firewire input terminal and the varistor between.
4. surge protection circuit according to claim 3, which is characterized in that the surge protection circuit further includes protective tube,
The protective tube is connected between first choke coil and the firewire input terminal exchanged.
5. surge protection circuit according to claim 1, which is characterized in that first choke coil is connected on the exchange
Zero curve input terminal and the varistor between.
6. a kind of electromagnetic heater, which is characterized in that the electromagnetic heater includes the surge according to claim 1-5
Protect circuit, bridge heap and electromagnetism that circuit occurs, wherein the both ends of the varistor connect the bridge heap respectively two are defeated
Enter end, the second capacitance of connecting between two output terminals of the bridge heap；
Wherein described electromagnetism occurs circuit and includes：Second capacitance, third capacitance, the 4th capacitance, coil panel, constantan wire and
Power device, wherein an output terminal of the bridge heap connects the constantan wire, another output terminal of the bridge heap and described
It connects between the free end of constantan wire the third capacitance；4th capacitance is connected on the third electricity with the power device
Between the both ends of appearance, the coil panel is in parallel with the 4th capacitance.
7. electromagnetic heater according to claim 6, which is characterized in that the capacitance of first capacitance is less than described
The capacitance of third capacitance.
8. electromagnetic heater according to claim 7, which is characterized in that first capacitance and second capacitance
The value range of capacitance is 0.1-1 μ F；And
The value range of the capacitance of the third capacitance is 2-10 μ F.
9. a kind of household electrical appliance, which is characterized in that the household electrical appliance include the surge protection electricity according to claim 1-5
Road.
10. a kind of household electrical appliance, which is characterized in that the household electrical appliance include the electromagnetic heating dress according to claim 6-8
It puts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611178701.XA CN108207046A (en) | 2016-12-19 | 2016-12-19 | Surge protection circuit, electromagnetic heater and household electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611178701.XA CN108207046A (en) | 2016-12-19 | 2016-12-19 | Surge protection circuit, electromagnetic heater and household electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108207046A true CN108207046A (en) | 2018-06-26 |
Family
ID=62602240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611178701.XA Pending CN108207046A (en) | 2016-12-19 | 2016-12-19 | Surge protection circuit, electromagnetic heater and household electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108207046A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
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| CN202455254U (en) * | 2012-03-01 | 2012-09-26 | 杭州乐图光电科技有限公司 | Switching power supply and lightning surge protection circuit applied same |
| WO2013064329A1 (en) * | 2011-11-03 | 2013-05-10 | Arcelik Anonim Sirketi | An induction heating cooker |
| CN203661320U (en) * | 2013-10-29 | 2014-06-18 | 美的集团股份有限公司 | Electromagnetic heating apparatus main board and electromagnetic cooker |
| CN204993052U (en) * | 2015-08-27 | 2016-01-20 | 深圳市鑫汇科股份有限公司 | EMC wave filter |
| CN206251365U (en) * | 2016-12-19 | 2017-06-13 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit, electromagnetic heater and household electrical appliance |
-
2016
- 2016-12-19 CN CN201611178701.XA patent/CN108207046A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013064329A1 (en) * | 2011-11-03 | 2013-05-10 | Arcelik Anonim Sirketi | An induction heating cooker |
| CN202455254U (en) * | 2012-03-01 | 2012-09-26 | 杭州乐图光电科技有限公司 | Switching power supply and lightning surge protection circuit applied same |
| CN203661320U (en) * | 2013-10-29 | 2014-06-18 | 美的集团股份有限公司 | Electromagnetic heating apparatus main board and electromagnetic cooker |
| CN204993052U (en) * | 2015-08-27 | 2016-01-20 | 深圳市鑫汇科股份有限公司 | EMC wave filter |
| CN206251365U (en) * | 2016-12-19 | 2017-06-13 | 佛山市顺德区美的电热电器制造有限公司 | Surge protection circuit, electromagnetic heater and household electrical appliance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710407A (en) * | 2019-10-25 | 2021-04-27 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating appliance and temperature measuring device and temperature measuring method thereof |
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