CN204669216U - A kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive - Google Patents
A kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive Download PDFInfo
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- CN204669216U CN204669216U CN201520286461.XU CN201520286461U CN204669216U CN 204669216 U CN204669216 U CN 204669216U CN 201520286461 U CN201520286461 U CN 201520286461U CN 204669216 U CN204669216 U CN 204669216U
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Abstract
The utility model relates to a kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive, comprise boosting isolating transformer (1), rectifier bridge (2), capacitor (5), current-limiting inductance (7), controllable silicon (8), capacitance resistance (9), pulse transformer (10), auxiliary relay (11) and resistance four (12), boosting isolating transformer (1) one end connects 220V AC power, the other end connects rectifier bridge (2), rectifier bridge (2) connects capacitor (5) and current-limiting inductance (7), current-limiting inductance (7) other end connects controllable silicon (8), controllable silicon (8) two ends shunt capacitance resistance (9), controllable silicon (8) is by connection pulse transformer (10), auxiliary relay (11), resistance four (12), the utility model compared with the existing technology, has been broken the bottleneck that parallel resonance is difficult to start under case of heavy load, under the fully loaded transportation condition of shunt-resonant circuit, has been served key effect.
Description
[technical field]
The utility model relates to cavityless casting intermediate frequency power supply technical field, specifically a kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive.
[background technology]
Along with the develop rapidly of the industries such as casting, forging, steel-making, day by day urgent to high-power intermediate frequency power supply demand.Existing commercialization induction heating middle frequency furnace capacity, much smaller than traditional furnace cupola, capacity of electric arc furnace, makes the advantage of intermediate frequency induction heating power supply be difficult to embody.
The inversion resonance portion of this intermediate frequency power supply is generally divided into series resonance and parallel resonance.In industrial circle traditional in the past, conventional series resonant tank starts simple and easy, but there is overvoltage problem, poor stability, inversion control big current, and requires high to inversion controllable silicon, and general series resonance is only applicable to less than 8 tons electric furnaces.Parallel resonance intermediate frequency power supply has overwhelming superiority in high-power induction heating field, especially electric furnace more than 8 tons, but shunt-resonant circuit exists difficulty in starting, particularly large power supply is when heavy burden starts under conditions, and parallel resonance difficulty in starting seems particularly outstanding.
[utility model content]
The purpose of this utility model is exactly will solve above-mentioned deficiency and provide a kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive, break the bottleneck that parallel resonance is difficult to start under case of heavy load, under the fully loaded transportation condition of shunt-resonant circuit, serve key effect.
Design a kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive for achieving the above object, comprise boosting isolating transformer 1, rectifier bridge 2, capacitor 5, current-limiting inductance 7, controllable silicon 8, capacitance resistance 9, pulse transformer 10, auxiliary relay 11 and resistance 4 12, described boosting isolating transformer 1 one end connects 220V AC power, described boosting isolating transformer 1 other end connects rectifier bridge 2, described rectifier bridge 2 connects capacitor 5 and current-limiting inductance 7 respectively, described capacitor 5 is connected between the two poles of the earth of electric induction furnace resonant tank, described capacitor 5 is connected with current-limiting inductance 7, described current-limiting inductance 7 other end connects controllable silicon 8, described controllable silicon 8 two ends shunt capacitance resistance 9, described controllable silicon 8 is by connection pulse transformer 10, auxiliary relay 11, resistance 4 12, described pulse transformer 10, auxiliary relay 11, resistance 4 12 forms control machines loop.
Circuit between described boosting isolating transformer 1 and 220V AC power is in series with wire resistor 36, and described wire resistor 36 is 47 ohm of wire resistors.
Described capacitor 5 two ends wire resistor 24 in parallel, described wire resistor 24 is 10 kilo-ohms of wire resistors.
Be in series with wire resistor 1 between described rectifier bridge 2 and current-limiting inductance 7, described wire resistor 1 is 47 ohm of wire resistors.
Described resistance 4 12 is 1 kilo-ohm of resistance, and described capacitance resistance 9 comprises 15 Ohmic resistances and 0.1 μ F electric capacity, and described capacitor 5 is 220 μ F capacitors.
The utility model compared with the existing technology, novel structure, simple, reasonable in design, the parallel resonance separated exciting starting drive be made up of boosting isolating transformer, rectifier bridge, capacitor, current-limiting inductance, controllable silicon, pulse transformer, auxiliary relay etc., break the bottleneck that parallel resonance is difficult to start under case of heavy load, under the fully loaded transportation condition of shunt-resonant circuit, serve key effect, lay a good foundation for high-power intermediate frequency power supply from now on further develops at industrial circle.
[accompanying drawing explanation]
Fig. 1 is structural representation of the present utility model;
Fig. 2 is application principle schematic diagram of the present utility model;
In figure: 1, boost isolating transformer 2, rectifier bridge 3, wire resistor 1, wire resistor 25, capacitor 6, wire resistor 37, current-limiting inductance 8, controllable silicon 9, capacitance resistance 10, pulse transformer 11, auxiliary relay 12, resistance four.
[embodiment]
Below in conjunction with accompanying drawing, following further illustrating is done to the utility model:
As shown in Figure 1, the utility model comprises: boosting isolating transformer 1, rectifier bridge 2, capacitor 5, current-limiting inductance 7, controllable silicon 8, capacitance resistance 9, pulse transformer 10, auxiliary relay 11 and resistance 4 12, boosting isolating transformer 1 one end connects 220V AC power, boosting isolating transformer 1 other end connects rectifier bridge 2, rectifier bridge 2 connects capacitor 5 and current-limiting inductance 7 respectively, capacitor 5 is connected between the two poles of the earth of electric induction furnace resonant tank, capacitor 5 is connected with current-limiting inductance 7, current-limiting inductance 7 other end connects controllable silicon 8, controllable silicon 8 two ends shunt capacitance resistance 9, controllable silicon 8 is by connection pulse transformer 10, auxiliary relay 11, resistance 4 12, pulse transformer 10, auxiliary relay 11, resistance 4 12 forms control machines loop.Wherein, the circuit between boosting isolating transformer 1 and 220V AC power is in series with wire resistor 36, and wire resistor 36 is 47 ohm of wire resistors; Capacitor 5 two ends wire resistor 24 in parallel, wire resistor 24 is 10 kilo-ohms of wire resistors; Be in series with wire resistor 1 between rectifier bridge 2 and current-limiting inductance 7, wire resistor 1 is 47 ohm of wire resistors; Resistance 4 12 is 1 kilo-ohm of resistance, and capacitance resistance 9 comprises 15 Ohmic resistances and 0.1 μ F electric capacity, and capacitor 5 is 220 μ F capacitors.
In the utility model, 220V AC power is mainly converted to 300V AC power by boosting isolating transformer, and Main Function is buffer action between boosting and high-low pressure.Rectifier bridge is that above-mentioned 300 AC conversion are become DC power supply.47 ohm of wire resistors are current-limiting resistance in charging process.10 kilo-ohms of wire resistors are the discharge resistance of 220 μ F capacitors.220 μ F capacitors are storage power and release energy to resonant tank when starting.Current-limiting inductance is in start-up course, to the restriction of 220 μ F capacitor release currents.Controllable silicon is that 220 μ F capacitor energies are discharged into resonant tank by opening controllable silicon to realize by power initiation instantaneously.15 Ohmic resistances and 0.1 μ F electric capacity are protection silicon controlled device.Pulse transformer, 1 kilo-ohm of resistance, 24V auxiliary relay trigger loop for controlling silicon controlled.In accompanying drawing 1, U and V represents the two poles of the earth of resonant tank respectively, and 220 μ F capacitive energies are released energy to resonant tank by U and V exactly.
As shown in Figure 2, during the utility model application, this parallel resonance separated exciting starting drive branch is connected electric induction furnace resonant tank, power supply, PLC and the digital control center of electric induction furnace DICU.
Operation principle of the present utility model is, inversion starts is opened by rectification and inversion controllable silicon instantaneously simultaneously, then when electric current rises to resonant tank resonance set point, system opens the controllable silicon on starting drive, then the energy in starting drive capacitor is transported to resonant tank fast, make resonant tank obtain enough energy to vibrate, simultaneously the electric current of resonant tank and voltage are shown as steady ascendant trend, thus ensure that resonant tank also can not cause starting unsuccessfully because startup energy shortage under heavy loads.In start-up course, after starting drive release reaches entry condition, the controllable silicon on starting drive can turn off immediately, thus ensures that startup energy can not overshoot.After starting drive controllable silicon is closed, power supply can charge to the capacitor on starting drive automatically, prepare for starting next time, starting drive can be always standby after startup is finished the work instantaneously, without any impact when normally working on resonant tank, until just start working when restarting next time.
The utility model is not by the restriction of above-mentioned execution mode; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (5)
1. an electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive, it is characterized in that: comprise boosting isolating transformer (1), rectifier bridge (2), capacitor (5), current-limiting inductance (7), controllable silicon (8), capacitance resistance (9), pulse transformer (10), auxiliary relay (11) and resistance four (12), described boosting isolating transformer (1) one end connects 220V AC power, described boosting isolating transformer (1) other end connects rectifier bridge (2), described rectifier bridge (2) connects capacitor (5) and current-limiting inductance (7) respectively, described capacitor (5) is connected between the two poles of the earth of electric induction furnace resonant tank, described capacitor (5) is connected with current-limiting inductance (7), described current-limiting inductance (7) other end connects controllable silicon (8), described controllable silicon (8) two ends shunt capacitance resistance (9), described controllable silicon (8) is by connection pulse transformer (10), auxiliary relay (11), resistance four (12), described pulse transformer (10), auxiliary relay (11), resistance four (12) forms control machines loop.
2. electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive as claimed in claim 1, it is characterized in that: the circuit between described boosting isolating transformer (1) and 220V AC power is in series with wire resistor three (6), described wire resistor three (6) is 47 ohm of wire resistors.
3. electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive as claimed in claim 2, it is characterized in that: described capacitor (5) two ends wire resistor two (4) in parallel, described wire resistor two (4) is 10 kilo-ohms of wire resistors.
4. electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive as claimed in claim 3, it is characterized in that: be in series with wire resistor one (3) between described rectifier bridge (2) and current-limiting inductance (7), described wire resistor one (3) is 47 ohm of wire resistors.
5. electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive as claimed in claim 4, it is characterized in that: described resistance four (12) is 1 kilo-ohm of resistance, described capacitance resistance (9) comprises 15 Ohmic resistances and 0.1 μ F electric capacity, and described capacitor (5) is 220 μ F capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286461.XU CN204669216U (en) | 2015-05-05 | 2015-05-05 | A kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520286461.XU CN204669216U (en) | 2015-05-05 | 2015-05-05 | A kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204669216U true CN204669216U (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520286461.XU Expired - Fee Related CN204669216U (en) | 2015-05-05 | 2015-05-05 | A kind of electric induction furnace intermediate frequency power supply parallel resonance separated exciting starting drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204669216U (en) |
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2015
- 2015-05-05 CN CN201520286461.XU patent/CN204669216U/en not_active Expired - Fee Related
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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: 20150923 Termination date: 20210505 |
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| CF01 | Termination of patent right due to non-payment of annual fee |