CN108924980B - Arbitrary double-frequency power signal generating circuit based on voltage superposition principle - Google Patents
Arbitrary double-frequency power signal generating circuit based on voltage superposition principle Download PDFInfo
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- CN108924980B CN108924980B CN201810735112.XA CN201810735112A CN108924980B CN 108924980 B CN108924980 B CN 108924980B CN 201810735112 A CN201810735112 A CN 201810735112A CN 108924980 B CN108924980 B CN 108924980B
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- 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
- H05B6/04—Sources of current
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- 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
Abstract
The invention discloses an arbitrary double-frequency power signal generating circuit based on a voltage superposition principle, which comprises a full-bridge inversion main circuit direct-current power supply, wherein the full-bridge inversion main circuit direct-current power supply is connected with the full-bridge inversion main circuit, the full-bridge inversion main circuit is connected with a transformer, the transformer is connected with a load circuit, and the transformer is also connected with a positive signal modulation circuit and a negative signal modulation circuit respectively. The invention discloses an arbitrary double-frequency power signal generating circuit based on a voltage superposition principle, which solves the problems that the frequency of an output signal of a single-inverter double-frequency induction heating power supply is limited and cannot be adjusted arbitrarily in the prior art. By using the voltage superposition principle, the output voltage of the positive and negative signal modulation circuits is alternately superposed on the positive and negative waveform voltages of the low-frequency square wave signal of the main circuit, and a double-frequency power signal is synthesized and output to a load. The output voltage frequency of the positive and negative signal modulation circuits and the main circuit can be independently adjusted, and the harmonic frequency of the synthesized signal can be arbitrarily changed.
Description
Technical Field
The invention belongs to the technical field of induction heating power supplies, and particularly relates to an arbitrary double-frequency power signal generating circuit based on a voltage superposition principle.
Background
In the induction heating application, because the frequency of the current in the induction coil is inversely proportional to the heating thickness (penetration depth) of the workpiece to be heated, the frequency of the current has an influence on the distribution of the heating power of different parts of the workpiece and the heating speed, and the existing research shows that the frequency of the current in the induction coil is an important factor for determining the heating performance of the workpiece. Therefore, when a heated workpiece with a complicated surface geometry is processed, the inconsistent heating effect of the induced current with a single frequency on different parts can seriously affect the processing quality of the workpiece.
The double-frequency induction heating mode is the only way to solve the problem of heat treatment of workpieces with complicated surface geometries. The double-frequency induction heating technology adopts double-frequency induction current, and applies energy to different parts of the workpiece to be processed simultaneously, so that the workpiece is not easy to deform. It is favorable for improving the quality of various spare and accessory parts and plates required by industries of automobiles, aviation and the like, and reducing the probability of automobile and airplane faults caused by product deformation and abrasion. In recent years, some dual-frequency induction heating methods have been proposed at home and abroad, and a synchronous dual-frequency induction heating technology (SDF) is a method for processing a workpiece by simultaneously using two different frequencies on an induction coil. However, the following defects exist in the technical realization of the method: the control mode of the double inverters is complex, and the synchronization is difficult to realize; the power dissipation of the two inverters is unbalanced; the electromagnetic interference phenomenon is severe. Laboratory research has also been conducted on a single-inverter dual-frequency induction heating power supply technology based on the SDF technology, but the output signal frequency is limited, and only medium and high frequency signals can be output.
Disclosure of Invention
The invention aims to provide an arbitrary double-frequency power signal generating circuit based on a voltage superposition principle, and solves the problems that the frequency of an output signal of a single-inverter double-frequency induction heating power supply is limited and cannot be adjusted arbitrarily in the prior art.
The invention adopts the technical scheme that the arbitrary double-frequency power signal generating circuit based on the voltage superposition principle comprises a full-bridge inverter main circuit direct-current power supply, wherein the full-bridge inverter main circuit direct-current power supply is connected with the full-bridge inverter main circuit, the full-bridge inverter main circuit is connected with a transformer, the transformer is connected with a load circuit, and the transformer is also respectively connected with a positive signal modulation circuit and a negative signal modulation circuit.
Yet another feature of the present invention is that,
the full-bridge inverter main circuit comprises a power switch tube IGBT Ga1And power switch tube IGBT Ga3Power switch tube IGBT Ga1Source electrode of and power switch tube IGBT Ga3The source electrodes of the power switching tube IGBT G are connected with the positive electrode of the full-bridge inverter main circuit direct-current power supplya1IGBT G of drain and power switch tubea2Is connected with a source electrode of a power switch tube IGBT Ga3IGBT G of drain and power switch tubea4Is connected with a source electrode of a power switch tube IGBT Ga2IGBT G of drain and power switch tubea4All the drain stages are inverted with the full-bridgeThe negative pole of the main circuit DC power supply is connected with a power switch tube IGBT Ga1And power switch tube IGBT Ga2The node between the two is connected with one end of the primary side of the transformer, and the power switch tube IGBT Ga3And power switch tube IGBT Ga4The node between the two is connected with the other end of the primary side of the transformer.
The positive signal modulation circuit comprises a power switch tube IGBT Ga5Power switch tube IGBT Ga5The drain of the power switch tube IGBT G is connected with the secondary side port of the transformera5The source of the modulation circuit is connected with the anode of the modulation circuit direct current power supply, and the cathode of the modulation circuit direct current power supply is connected with the port of the load circuit.
The negative signal modulation circuit comprises a power switch tube IGBT Ga6Power switch tube IGBT Ga6The drain stage of the power switch tube IGBT is connected with the port of the load circuita6The source of the negative signal modulation circuit is connected with the positive pole of the direct current power supply of the negative signal modulation circuit, and the negative pole of the direct current power supply of the negative signal modulation circuit is connected with the secondary side port of the transformer.
The double-frequency induction heating power supply circuit has the beneficial effects that the problem that the frequency of the output signal of the single-inverter double-frequency induction heating power supply is limited and cannot be adjusted at will in the prior art is solved by the arbitrary double-frequency power signal generating circuit based on the voltage superposition principle. By using the voltage superposition principle, the output voltage of the positive and negative signal modulation circuits is alternately superposed on the positive and negative waveform voltages of the low-frequency square wave signal of the main circuit, and a double-frequency power signal is synthesized and output to a load. The output voltage frequency of the positive and negative signal modulation circuits and the main circuit can be independently adjusted, and the harmonic frequency of the synthesized signal can be arbitrarily changed.
Drawings
FIG. 1 is a topological block diagram of an arbitrary dual-frequency power signal generation circuit based on the principle of voltage superposition according to the present invention;
FIG. 2 is a graph showing output voltage waveforms of fundamental frequency and triple frequency signals output by the dual frequency power signal generating circuit;
fig. 3 is an output voltage waveform of a dual-frequency power signal generation circuit outputting a fundamental frequency and a quintupling frequency signal.
In the figure, 1 is a full-bridge inverter main circuit direct-current power supply, 2 is a full-bridge inverter main circuit, 3 is a transformer, 4 is a positive signal modulation circuit, 5 is a negative signal modulation circuit, 6 is a load circuit, 7 is a transformer secondary side port, 8 is a load circuit port, 9 is a positive signal modulation circuit direct-current power supply, and 10 is a negative signal modulation circuit direct-current power supply.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The arbitrary double-frequency power signal generating circuit based on the voltage superposition principle comprises a full-bridge inverter main circuit direct-current power supply 1, wherein the full-bridge inverter main circuit direct-current power supply 1 is connected with a full-bridge inverter main circuit 2, the full-bridge inverter main circuit 2 is connected with a transformer 3, the transformer 3 is connected with a load circuit 6, and the transformer 3 is also connected with a positive signal modulation circuit 4 and a negative signal modulation circuit 5 respectively, as shown in figure 1.
The full-bridge inverter main circuit comprises a power switch tube IGBT Ga1And power switch tube IGBT Ga3Power switch tube IGBT Ga1Source electrode of and power switch tube IGBT Ga3The source electrodes of the power switch tube IGBT G are connected with the positive electrode of a full-bridge inverter main circuit direct current power supply 1a1IGBT G of drain and power switch tubea2Is connected with a source electrode of a power switch tube IGBT Ga3IGBT G of drain and power switch tubea4Is connected with a source electrode of a power switch tube IGBT Ga2IGBT G of drain and power switch tubea4The drain electrodes of the power switch tube IGBT G are connected with the negative electrode of a direct current power supply 1 of a full-bridge inverter main circuita1And power switch tube IGBT Ga2The node between the two is connected with one end of the primary side of the transformer 3, and the power switch tube IGBT Ga3And power switch tube IGBT Ga4The node between the two is connected with the other end of the primary side of the transformer 3.
The positive signal modulation circuit 4 comprises a power switch tube IGBT Ga5Power switch tube IGBT Ga5Is connected with the secondary side port 7 of the transformer 3, and a power switch tube IGBT Ga5Is connected to the positive pole of the modulation circuit dc power supply 9, and the negative pole of the modulation circuit dc power supply 9 is connected to the port 8 of the load circuit 6.
The negative signal modulation circuit 5 comprises a power switch tube IGBT Ga6Power switch tube IGBT Ga6Is connected with a port 8 of a load circuit 6, and a power switch tube IGBT Ga6Is connected with the positive pole of the negative signal modulation circuit direct current power supply 10, and the negative pole of the negative signal modulation circuit direct current power supply 10 is connected with the secondary side port 7 of the transformer 3.
The working principle of the random double-frequency power signal generating circuit based on the voltage superposition principle is as follows: the full-bridge inverter main circuit 2 generates low-frequency positive and negative square wave voltage signals, and the positive and negative square wave voltage signals are output to the secondary side of the transformer 3 through the transformer 3; the positive signal modulation circuit 4 and the negative signal modulation circuit 5 work alternately periodically, the positive signal modulation circuit 4 works, and the power switch tube IGBT Ga5The negative signal modulation circuit 5 does not work when the power switch tube IGBT G is switched ona6Turning off; the negative signal modulation circuit 5 works, and the power switch tube IGBT Ga6The power switch tube IGBT G is switched on, the positive signal modulation circuit 4 does not worka5Turning off; the composite signal of the positive and negative square wave voltage signals modulated by the positive signal modulation circuit 4 and the negative signal modulation circuit 5 is a double-frequency power signal, the signal is output to the load circuit 6, and the power switch tube IGBT G in the positive signal modulation circuit 4 is changeda5The trigger frequency and the power switch tube IGBT G in the negative signal modulation circuit 5a6The harmonic frequency of the dual-frequency power signal is adjusted; the fundamental frequency of the double-frequency power signal is adjusted by changing the working frequency of the full-bridge inverter main circuit 2; and realizing the output of any double-frequency power signal.
The random double-frequency power signal generating circuit based on the voltage superposition principle realizes double-frequency power signal output by utilizing the output voltages of the positive and negative modulation circuits to be alternately superposed on the positive and negative voltage levels of the main circuit based on the voltage superposition principle, can randomly adjust the harmonic frequency of the double-frequency power signal by changing the working frequency of the positive and negative modulation circuits, meets the requirements of loads on different signal frequencies, has simple working mode, and improves the adjustable characteristic and the energy utilization rate of the double-frequency power signal of the induction heating power supply.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The working frequency of the full-bridge inverter main circuit is f-5 kHz, and power switching tubes IGBT G in the positive modulation circuit and the negative modulation circuit are respectively connecteda5And power switch tube IGBT Ga6Is adjusted from 3f (15kHz) to 5f (25 kHz).
Fig. 2 is a voltage waveform of an output fundamental frequency and a frequency tripling signal of the dual-frequency power signal generation circuit, and fig. 3 is a voltage waveform of an output fundamental frequency and a frequency quintupling signal of the dual-frequency power signal generation circuit. As can be seen from fig. 2 and 3, the dual-frequency power signal generation circuit of the present invention can generate any dual-frequency signal output by simply adjusting the operating frequencies of the positive and negative modulation circuits, and the dual-frequency induction heating power supply has more flexible frequency adjustment characteristics and harmonic energy utilization rate.
Claims (2)
1. Arbitrary double-frequency power signal generating circuit based on voltage superposition principle, its characterized in that, including full-bridge contravariant main circuit DC power supply (1), full-bridge contravariant main circuit DC power supply (1) links to each other with full-bridge contravariant main circuit (2), full-bridge contravariant main circuit (2) link to each other with transformer (3), transformer (3) are connected with load circuit (6), transformer (3) still are connected with positive signal modulation circuit (4) and negative signal modulation circuit (5) respectively, positive signal modulation circuit (4) include power switch tube IGBT Ga5The power switch tube IGBT Ga5The drain of the power switch tube is connected with a secondary side port (7) of the transformer (3), and the power switch tube IGBT Ga5The source of the modulation circuit is connected with the anode of a modulation circuit direct current power supply (9), the cathode of the modulation circuit direct current power supply (9) is connected with a port (8) of the load circuit (6), and the negative signal modulation circuit (5) comprises a power switch tube IGBT Ga6The power switch tube IGBT Ga6Is connected with a port (8) of the load circuit (6), and the power switch tube IGBT Ga6The source of the negative signal modulation circuit is connected with the positive electrode of a direct current power supply (10) of the negative signal modulation circuit, and the negative electrode of the direct current power supply (10) of the negative signal modulation circuit is connected with a secondary side port (7) of the transformer (3).
2. The base of claim 1The arbitrary double-frequency power signal generating circuit based on the voltage superposition principle is characterized in that the full-bridge inverter main circuit (2) comprises a power switch tube IGBT Ga1And power switch tube IGBT Ga3The power switch tube IGBT Ga1Source electrode of and power switch tube IGBT Ga3The source electrodes of the power switch tube IGBT G are connected with the positive electrode of the full-bridge inverter main circuit direct-current power supply (1)a1IGBT G of drain and power switch tubea2The source electrode of the power switch tube IGBT G is connected with the power switch tube IGBT Ga3IGBT G of drain and power switch tubea4The source electrode of the power switch tube IGBT G is connected with the power switch tube IGBT Ga2IGBT G of drain and power switch tubea4The drain stage of the power switch tube is connected with the negative electrode of the full-bridge inverter main circuit direct-current power supply (1), and the power switch tube IGBT Ga1And the power switch tube IGBT Ga2The node between the two is connected with one end of the primary side of the transformer (3), and the power switch tube IGBT Ga3And the power switch tube IGBT Ga4The node between the two is connected with the other end of the primary side of the transformer (3).
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| JPH0645057A (en) * | 1992-07-22 | 1994-02-18 | Shimada Phys & Chem Ind Co Ltd | Induction heating power source |
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