Demagnetizing machine and power supply device for supplying power to magnetic induction coil

Abstract

The utility model discloses a demagnetizing machine and a power supply device for supplying power to magnetic induction coils, the power supply device comprises a transformer, a rectification circuit, a soft start circuit, a filter circuit, a plurality of bridge circuits and a control module, the number of the bridge circuits is the same as that of the magnetic induction coils, and each bridge circuit corresponds to one magnetic induction coil; the bridge circuit is composed of four IGBT modules, and the output end of the bridge circuit is connected with the corresponding magnetic induction coil. The input end of the transformer is connected with an external power supply, and the output end of the transformer is connected with the input end of the rectifying circuit; the output end of the rectification circuit is connected with the filter circuit through a soft start circuit. The bridge circuit is connected in parallel with two ends of the filter circuit; and the control module is connected with the control end of each bridge circuit. According to the utility model, the purpose that a single power supply device supplies power to a plurality of magnetic induction coils is realized, the cost is reduced, and the control is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply, and in particular relates to a demagnetizer and a power supply device for powering a magnetic induction coil. Background Art

[0002] In order to improve the demagnetization effect of a single demagnetization device, two electromagnetic coils are usually arranged on the same demagnetization device to achieve two-stage demagnetization, which requires two independent DC power supplies to meet the power supply required by the single demagnetization device. Two independent DC power supplies are costly and complex to control. Utility Model Content

[0003] The utility model aims to provide a demagnetizer and a power supply device for powering a magnetic induction coil, so as to solve the problem of high cost caused by using multiple independent DC power supplies to power each magnetic induction coil respectively.

[0004] The utility model solves the above technical problems through the following technical solutions: a power supply device for powering a magnetic induction coil, comprising a transformer, a rectifier circuit, a soft start circuit, a filter circuit, a plurality of bridge circuits and a control module, wherein the number of the bridge circuits is the same as the number of the magnetic induction coils, and each bridge circuit corresponds to a magnetic induction coil; the bridge circuit is composed of four IGBT modules, and the output end of the bridge circuit is connected to the corresponding magnetic induction coil; the input end of the transformer is connected to an external power supply, and the output end thereof is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the filter circuit through a soft start circuit; the bridge circuit is connected in parallel to the two ends of the filter circuit; and the control module is connected to the control end of each of the bridge circuits.

[0005] Furthermore, the rectifier circuit is a three-phase full-bridge circuit composed of diodes D1 to D6.

[0006] Furthermore, the soft start circuit is composed of a resistor R1 and a contactor contact KM1 connected in parallel.

[0007] Furthermore, the filtering circuit includes a first branch formed by a resistor R2 and a capacitor C1 connected in parallel, and a second branch formed by a resistor R3 and a capacitor C2 connected in parallel, and the first branch and the second branch are connected in series.

[0008] Furthermore, the magnetic induction coil includes an electromagnetic coil and / or a permanent magnet coil.

[0009] Furthermore, the bridge circuit includes a first bridge circuit and a second bridge circuit, the first bridge circuit is composed of a first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module, and the second bridge circuit is composed of a fifth IGBT module, a sixth IGBT module, a seventh IGBT module and an eighth IGBT module.

[0010] Based on the same concept, the utility model also provides a demagnetizer, which includes a cylinder, a three-way assembly connected to the bottom of the cylinder, a plurality of demagnetization units and the power supply device as described above; the plurality of demagnetization units are sequentially sleeved on the cylinder, and each demagnetization unit includes a magnetic induction coil, a shell and a screen; the shell and the magnetic induction coil are sleeved on the cylinder, the magnetic induction coil is located in the shell, and the screen is arranged in the cylinder and corresponds to the magnetic induction coil; the magnetic induction coil is connected to the output end of the bridge circuit of the power supply device.

[0011] Furthermore, the three-way assembly includes a flap three-way valve and an electric cylinder; the first port of the flap three-way valve is connected to the bottom of the cylinder through a soft connector, the second port of the flap three-way valve serves as a discharge port for magnetic materials, and the third port of the flap three-way valve serves as a discharge port for materials; the electric cylinder is connected to a control module, and the telescopic end of the electric cylinder is connected to the crank of the flap three-way valve.

[0012] Beneficial Effects

[0013] Compared with the prior art, the advantages of the utility model are:

[0014] The power supply device of the utility model includes a plurality of bridge circuits composed of four IGBT modules, and the output end of each bridge circuit is connected to an induction coil for supplying power to the induction coil; the control module controls the direction and magnitude of the output current of the power supply module by controlling the conduction and cutoff of the IGBT module in the bridge circuit; the power supply device of the utility model can supply power to a plurality of magnetic induction coils, thereby realizing the purpose of supplying power to a plurality of magnetic induction coils with a single power supply device, reducing the cost and simplifying the control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a circuit diagram of a power supply device in an embodiment of the utility model;

[0017] Figure 2It is a structural schematic diagram of a demagnetizer in an embodiment of the utility model.

[0018] Explanation of the reference numerals: 1-cylinder, 2-tee assembly, 3-magnetic induction coil, 4-housing, 5-screen. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solution in the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Example 1

[0021] like Figure 1 As shown, a power supply device for powering a magnetic induction coil provided by an embodiment of the utility model includes a transformer T1, a rectifier circuit, a soft start circuit, a filter circuit, a first bridge circuit composed of a first IGBT module IGBT1, a second IGBT module IGBT2, a third IGBT module IGBT3 and a fourth IGBT module IGBT4, and a second bridge circuit composed of a fifth IGBT module IGBT5, a sixth IGBT module IGBT6, a seventh IGBT module IGBT7 and an eighth IGBT module IGBT8, the first bridge circuit corresponds to the first magnetic induction coil, and the second bridge circuit corresponds to the second magnetic induction coil; the input end of the transformer T1 is connected to an external 380VAC / 50Hz three-phase power supply, and the output end thereof is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the filter circuit through the soft start circuit; the first bridge circuit and the second bridge circuit are connected in parallel to the two ends of the filter circuit; the output end of the first bridge circuit is connected to the first magnetic induction coil, and the output end of the second bridge circuit is connected to the second magnetic induction coil; the control module is connected to the control ends of the first bridge circuit and the second bridge circuit. The control module regulates the direction and magnitude of the current input to the first magnetic induction coil by controlling the on and off of the IGBT module in the first bridge circuit, and regulates the direction and magnitude of the current input to the second magnetic induction coil by controlling the on and off of the IGBT module in the second bridge circuit.

[0022] In this embodiment, the soft start circuit is composed of a resistor R1 and a contactor contact KM1 in parallel; the filter circuit includes a first branch composed of a resistor R2 and a capacitor C1 in parallel, and a second branch composed of a resistor R3 and a capacitor C2 in parallel, and the first branch and the second branch are connected in series; the rectifier circuit is a three-phase full-bridge circuit composed of diodes D1 to D6.

[0023] The three-phase power supply is boosted to 1500VAC / 50Hz by transformer T1. The three-phase full-bridge circuit composed of diodes D1~D6 converts 1500VAC / 50Hz into pulsed DC, which is then converted into stable DC through high-voltage filter energy storage capacitors C1 and C2. Resistors R2 and R3 are connected in parallel with capacitors C1 and C2 to achieve voltage and current sharing. The role of resistor R1 and contactor contact KM1 is to achieve soft start. The role is to charge capacitors C1 and C2 through resistor R1 to limit the current, and then close contactor contact KM1 when fully charged. After rectification and filtering, the bus DC voltage with a maximum voltage of 2121VDC can be output in theory. Considering the voltage drop of diodes D1, D2, D3, D4, D5, and D6 and the fluctuation of incoming line voltage, the designed theoretical output is higher than the required 2000VDC, and some margin is reserved. The four IGBT modules IGBT1, IGBT2, IGBT3, and IGBT4 realize the first DC output through PWM chopping rectification to energize the first magnetic induction coil. The four IGBT modules IGBT5, IGBT6, IGBT7, and IGBT8 realize the second DC output through PWM chopping rectification to energize the second magnetic induction coil.

[0024] When fully charged, the resistor R1 is bypassed by closing the contactor contact KM1, thus avoiding the loss of the resistor R1.

[0025] The control module controls the on and off of IGBT1, IGBT2, IGBT3, and IGBT4 to adjust the first DC output. When IGBT1 and IGBT4 are controlled to be on, the first output is a forward current, and the forward current is passed to the first magnetic induction coil. The longer the on time, the greater the forward current; when IGBT2 and IGBT3 are controlled to be on, the first output is a reverse current, and the reverse current is passed to the first magnetic induction coil. The longer the on time, the greater the reverse current; the DC voltage and current direction are adjusted by controlling the on and off of the IGBT module; the DC voltage and current are accurately adjusted by controlling the on time of the IGBT module, so that the output voltage is linearly adjustable from 0 to 2000VDC, and the output current is linearly adjustable from 0 to 100A.

[0026] The control module controls the on and off of IGBT5, IGBT6, IGBT7, and IGBT8 to adjust the second DC output. When IGBT5 and IGBT8 are controlled to be on, the second outputs a forward current, and a forward current is passed through the second magnetic induction coil. The longer the on time, the greater the forward current. When IGBT6 and IGBT7 are controlled to be on, the second outputs a reverse current, and a reverse current is passed through the second magnetic induction coil. The longer the on time, the greater the reverse current. The DC voltage and current direction are adjusted by controlling the on and off of the IGBT module. The DC voltage and current are accurately adjusted by controlling the on time of the IGBT module, so that the output voltage is linearly adjustable from 0 to 2000 VDC, and the output current is linearly adjustable from 0 to 100 A.

[0027] The first magnetic induction coil and the second magnetic induction coil may both be electromagnetic coils, or both be permanent magnet coils, or one may be an electromagnetic coil and the other may be a permanent magnet coil.

[0028] The utility model realizes that a single power supply device supplies power to multiple magnetic induction coils, thereby reducing costs and reducing control complexity.

[0029] Example 2

[0030] like Figure 2 As shown, a demagnetizer provided by an embodiment of the utility model includes a cylinder 1, a three-way component 2 connected to the bottom of the cylinder 1, a plurality of demagnetization units and the power supply device described in Example 1; the plurality of demagnetization units are sequentially sleeved on the cylinder 1, and each demagnetization unit includes a magnetic induction coil 3, a shell 4 and a screen 5; the shell 4 and the magnetic induction coil 3 are sleeved on the cylinder 1, the magnetic induction coil 3 is located in the shell 4, and the screen 5 is arranged in the cylinder 1 and corresponds to the magnetic induction coil 3; the magnetic induction coil 3 is connected to the output end of the bridge circuit of the power supply device.

[0031] When the magnetic induction coil 3 is an electromagnetic coil, the electromagnetic coil is energized, and the magnetic field generated by the electromagnetic coil causes the screen 5 corresponding to the electromagnetic coil to absorb the magnetic substance in the material, thereby achieving demagnetization of the material; when the magnetic substance is discharged, the electromagnetic coil is powered off, and the magnetic substance falls from the screen 5 and is discharged. When the magnetic induction coil 3 is a permanent magnet coil, the permanent magnet coil is powered off, and the screen 5 corresponding to the permanent magnet coil is made of permanent magnet material, and the magnetic field generated by the screen 5 absorbs the magnetic substance in the material, thereby achieving demagnetization of the material; when the magnetic substance is discharged, the permanent magnet coil is energized, and the magnetic field generated by the permanent magnet coil cancels the magnetic field generated by the corresponding screen 5, and the magnetic substance falls from the screen 5 and is discharged.

[0032] In a specific embodiment of the utility model, the three-way assembly 2 includes a flap three-way valve and an electric cylinder; the first port of the flap three-way valve is connected to the bottom of the cylinder 1, the second port of the flap three-way valve is used as the magnetic material discharge port, and the third port of the flap three-way valve is used as the material discharge port; the electric cylinder is connected to the control module, and the telescopic end of the electric cylinder is connected to the crank of the flap three-way valve. Under the action of the control module, the electric cylinder performs telescopic operation, thereby driving the crank to rotate, realizing the rotation of the flap inside the flap three-way valve, thereby realizing the switching between the magnetic material discharge port and the material discharge port.

[0033] The above disclosure is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or modifications within the technical scope disclosed in the utility model, which should be included in the protection scope of the utility model.

Claims

1. A power supply device for powering a magnetic induction coil, characterized in that: It includes a transformer, a rectifier circuit, a soft start circuit, a filter circuit, a plurality of bridge circuits and a control module. The number of the bridge circuits is the same as the number of the magnetic induction coils, and each bridge circuit corresponds to a magnetic induction coil; the bridge circuit is composed of four IGBT modules, and the output end of the bridge circuit is connected to the corresponding magnetic induction coil; the input end of the transformer is connected to an external power supply, and the output end thereof is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the filter circuit through a soft start circuit; the bridge circuit is connected in parallel to the two ends of the filter circuit; and the control module is connected to the control end of each bridge circuit.

2. The power supply device for powering a magnetic induction coil according to claim 1, characterized in that: The rectifier circuit is a three-phase full-bridge circuit composed of diodes D1 to D6.

3. The power supply device for powering a magnetic induction coil according to claim 1, characterized in that: The soft start circuit is composed of a resistor R1 and a contactor contact KM1 connected in parallel.

4. The power supply device for powering a magnetic induction coil according to claim 1, characterized in that: The filter circuit includes a first branch formed by a resistor R2 and a capacitor C1 connected in parallel, and a second branch formed by a resistor R3 and a capacitor C2 connected in parallel, and the first branch and the second branch are connected in series.

5. The power supply device for powering a magnetic induction coil according to claim 1, characterized in that: The magnetic induction coil includes an electromagnetic coil and / or a permanent magnet coil.

6. The power supply device for powering a magnetic induction coil according to any one of claims 1 to 5, characterized in that: The bridge circuit includes a first bridge circuit and a second bridge circuit, the first bridge circuit is composed of a first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module, and the second bridge circuit is composed of a fifth IGBT module, a sixth IGBT module, a seventh IGBT module and an eighth IGBT module.

7. A demagnetizer, characterized in that: The demagnetizer includes a cylinder, a three-way assembly connected to the bottom of the cylinder, a plurality of demagnetization units and a power supply device according to any one of claims 1 to 6; the plurality of demagnetization units are sequentially sleeved on the cylinder, and each demagnetization unit includes a magnetic induction coil, a shell and a screen; the shell and the magnetic induction coil are sleeved on the cylinder, the magnetic induction coil is located in the shell, the screen is arranged in the cylinder and corresponds to the magnetic induction coil; the magnetic induction coil is connected to the output end of the bridge circuit of the power supply device.

8. The demagnetizer according to claim 7, characterized in that: The three-way assembly includes a flap three-way valve and an electric cylinder; the first port of the flap three-way valve is connected to the bottom of the cylinder through a soft connector, the second port of the flap three-way valve is used as a discharge port for magnetic materials, and the third port of the flap three-way valve is used as a discharge port for materials; The electric cylinder is connected to the control module, and the telescopic end of the electric cylinder is connected to the crank of the flap three-way valve.

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