CN219068075U - Main power circuit and alternating current coating power supply - Google Patents
Main power circuit and alternating current coating power supply Download PDFInfo
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- CN219068075U CN219068075U CN202223608495.5U CN202223608495U CN219068075U CN 219068075 U CN219068075 U CN 219068075U CN 202223608495 U CN202223608495 U CN 202223608495U CN 219068075 U CN219068075 U CN 219068075U
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Abstract
The utility model discloses a main power circuit and an alternating current coating power supply, which belong to the technical field of coating power supplies, wherein the main power circuit comprises a rectifying module, an inversion module, a resonance filtering module and a boosting module which are sequentially connected; the resonant filter module comprises a first filter circuit, a second filter circuit and a third filter circuit, wherein the input end of the first filter circuit is connected with the inversion module, the output end of the first filter circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is respectively connected with the positive input end of the boost module and the input end of the third filter circuit, and the output end of the third filter circuit is connected with the negative input end of the boost module; the inversion module inverts the direct current into a square wave signal, and the resonance filtering module performs three-stage resonance filtering on the square wave signal to obtain a sine wave signal. The utility model solves the problem that the coating power supply cannot effectively inhibit the arc energy when the load generates the arc, and achieves the effects of effectively inhibiting the load from generating the current arc and reducing the damage of the workpiece.
Description
Technical Field
The utility model relates to the technical field of coating power supplies, in particular to a main power circuit and an alternating current coating power supply.
Background
The current coating power supply mostly adopts a direct current coating power supply and a square wave coating power supply. The DC film plating power supply is characterized in that a voltage source is adopted, the output end of the DC film plating power supply is connected with a plurality of capacitors in parallel, and when an arc occurs in a plasma load, the energy stored in the capacitors is dumped to the load end, so that the arc energy can not be effectively restrained. Although the polarity of the output voltage is variable, the square wave film plating power supply still outputs in a form similar to a voltage source under a single polarity, and cannot effectively inhibit arc energy. The arc energy cannot be effectively restrained, and the surface of the workpiece is easily damaged or even burnt.
Disclosure of Invention
The main purpose of the utility model is that: the utility model provides a main power circuit and alternating current coating power supply, aims at solving the technical problem that the coating power supply in the prior art can not effectively inhibit arc energy when an arc occurs in a plasma load.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, the present utility model proposes a main power circuit, which includes a rectifying module, an inverting module, a resonant filtering module, and a boosting module connected in sequence;
the resonance filtering module comprises a first filtering circuit, a second filtering circuit and a third filtering circuit;
the input end of the first filter circuit is connected with the inversion module, the output end of the first filter circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is respectively connected with the positive input end of the boosting module and the input end of the third filter circuit, and the output end of the third filter circuit is connected with the negative input end of the boosting module;
the inversion module is used for inverting the direct current into a square wave signal, and the resonance filtering module is used for performing three-stage resonance filtering on the square wave signal to obtain a sine wave signal.
Optionally, in the main power circuit, the rectifying module includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, and a capacitor C7;
the positive pole of the diode D1 and the negative pole of the diode D2 are all connected with a first phase of a three-phase alternating current power grid, the positive pole of the diode D3 and the negative pole of the diode D4 are all connected with a second phase of the three-phase alternating current power grid, the positive pole of the diode D5 and the negative pole of the diode D6 are all connected with a third phase of the three-phase alternating current power grid, the negative pole of the diode D1, the negative pole of the diode D3, the negative pole of the diode D5 and one end of the capacitor C7 are all connected with a positive input end of the inversion module, and the positive pole of the diode D2, the positive pole of the diode D4, and the other end of the capacitor C7 are all connected with a negative input end of the inversion module.
Optionally, in the main power circuit, the inverter module includes a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4;
the drain electrode of the switch tube Q1 and the drain electrode of the switch tube Q3 are connected with the positive output end of the rectifying module, the source electrode of the switch tube Q2 and the source electrode of the switch tube Q4 are connected with the negative output end of the rectifying module, the source electrode of the switch tube Q1 and the drain electrode of the switch tube Q2 are connected with the positive input end of the resonance filtering module, and the source electrode of the switch tube Q3 and the drain electrode of the switch tube Q4 are connected with the negative input end of the resonance filtering module.
Optionally, in the main power circuit, the switching transistor Q1, the switching transistor Q2, the switching transistor Q3, and the switching transistor Q4 are metal oxide semiconductor field effect transistors or insulated gate bipolar transistors.
Optionally, in the main power circuit, the first filter circuit includes an inductor L1 and a capacitor C1;
one end of the inductor L1 is connected with the positive output end of the inversion module, the other end of the inductor L1 is connected with the positive input end of the second filter circuit, one end of the capacitor C1 is connected with the negative output end of the inversion module, and the other end of the capacitor C1 is connected with the negative input end of the second filter circuit.
Optionally, in the main power circuit, the second filter circuit includes a capacitor C2 and an inductor L2;
one end of the capacitor C2 and one end of the inductor L2 are connected with the positive output end of the first filter circuit and the positive input end of the boost module; the other end of the capacitor C2 and the other end of the inductor L2 are connected with the negative output end of the first filter circuit and the input end of the third filter circuit.
Optionally, in the main power circuit, the third filter circuit includes a capacitor C3 and an inductor L3;
one end of the capacitor C3 is connected with the negative output end of the second filter circuit, the other end of the capacitor C3 is connected with one end of the inductor L3, and the other end of the inductor L3 is connected with the negative input end of the boost module.
Optionally, in the main power circuit, the boost module includes a transformer T1;
the positive input end of the transformer T1 is connected with the positive output end of the second filter circuit, the negative input end of the transformer T1 is connected with the output end of the third filter circuit, the positive output end of the transformer T1 is connected with the positive electrode of the load, and the negative output end of the transformer T1 is connected with the negative electrode of the load.
In a second aspect, the utility model further provides an ac coating power supply, which comprises the main power circuit.
Optionally, in the above ac plating power supply, the power supply further includes:
the control module is respectively connected with the grid electrode of the switch tube Q1, the grid electrode of the switch tube Q2, the grid electrode of the switch tube Q3 and the grid electrode of the switch tube Q4, and is used for generating an enabling signal and outputting the enabling signal to the inversion module to control the inversion module to work.
The one or more technical schemes provided by the utility model can have the following advantages or at least realize the following technical effects:
according to the main power circuit and the alternating-current coating power supply, the direct current is processed into square wave signals through inversion of the inversion module through the rectification module, the inversion module, the resonance filtering module and the boosting module which are sequentially connected, and then three-level resonance filtering is carried out on the square wave signals through the resonance filtering module to obtain sine wave signals; the three-level resonance mode is adopted to filter the square wave signal into a sine wave signal, when the plasma load generates an arc, the softness of the waveform of the sine wave signal and the resonance inductance contained in the three-level resonance mode can effectively inhibit the load from generating a current arc, and the number of the arcs generated in unit time is improved; the AC coating power supply comprising the main power circuit is a sinusoidal output AC coating power supply, is different from a voltage type DC coating power supply and a voltage type square wave coating power supply, and can effectively inhibit arc energy and reduce damage to the surface of a workpiece.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a connection block diagram of a main power circuit of the present utility model;
FIG. 2 is a circuit topology of a resonant filter module and a boost module in a main power circuit of the present utility model;
FIG. 3 is a circuit topology of a rectifier module in a main power circuit of the present utility model;
FIG. 4 is a circuit topology of an inverter module in a main power circuit of the present utility model;
fig. 5 is a schematic diagram showing the variation of the output voltage and the output current of the main power circuit according to the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, in the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude that an additional identical element is present in a device or system comprising the element. In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized. In the present utility model, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the present utility model, suffixes such as "module", "part" or "unit" used for representing elements are used only for facilitating the description of the present utility model, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
In order to realize high-end manufacturing, the vacuum coating field not only puts higher requirements on the functions of the plasma coating power supply, but also puts higher requirements on the performances of the plasma coating power supply. Due to the complexity of the plasma load, the impedance is abrupt from infinity in the undischarged phase to several ohms in the arc phase, at nanosecond level, placing extremely high demands on the dynamic performance of the power supply. The control scheme of the traditional power supply can not be correspondingly adjusted according to nanosecond dynamic load, so that a special coating power supply is provided.
Analysis of the prior art shows that the current coating power supply mostly adopts a direct current coating power supply and a square wave coating power supply. The DC film plating power supply is characterized in that the DC film plating power supply is a voltage type power supply, the output end of the DC film plating power supply is connected with a plurality of capacitors in parallel, and when an arc occurs in a plasma load, the energy stored in the capacitors is dumped to the load end, so that the arc energy can not be effectively restrained. The DC/AC unit in the system structure of the square wave film plating power supply mostly adopts a full-bridge circuit plus a transformer to boost output, and although the polarity of the output voltage is variable, the output voltage still is output in a form similar to a voltage type power supply under single polarity, and the arc energy cannot be effectively restrained. The arc energy cannot be effectively restrained, and the surface of the workpiece is easily damaged or even burnt.
In view of the technical problems that in the prior art, when an arc occurs in a plasma load, arc energy cannot be effectively restrained, and a workpiece is easy to damage, the utility model provides a main power circuit and an alternating current coating power supply, and specific embodiments and implementation modes are as follows:
example 1
Referring to fig. 1, fig. 1 is a connection block diagram of a main power circuit of the present utility model; the embodiment provides a main power circuit applied to an alternating current coating power supply. The main power circuit may include a rectifying module, an inverting module, a resonant filtering module, and a boosting module connected in sequence;
the rectification module is connected with the three-phase alternating current power grid and used for converting received three-phase alternating current into direct current;
the inverting module is connected with the rectifying module and is used for inverting and processing the direct current into a square wave signal, wherein the square wave signal is an alternating current square wave with symmetrical positive and negative pulses;
the resonance filtering module is connected with the inversion module and is used for carrying out three-level resonance filtering on the square wave signal to obtain a sine wave signal;
and the boosting module is connected with the resonance filtering module and is used for boosting the sine wave signal and outputting alternating voltage.
Specifically, the rectification module converts three-phase alternating current into two-phase direct current, and an AC/DC circuit can be adopted; the inversion module converts the biphase direct current into biphase alternating current again, outputs alternating current square wave signals with symmetrical positive and negative pulses, and can adopt a DC/AC circuit; the resonance filtering module carries out three-level resonance filtering on the square wave signal to output a sine wave signal, and a three-level LC resonance filtering circuit can be adopted; the boosting module performs boosting processing on the sine wave signal and outputs alternating voltage, and a transformer can be adopted. The main power circuit is applied to an alternating current coating power supply, and is used as a sinusoidal output alternating current coating power supply to supply power for a plasma load, and the power supply can effectively filter an alternating current square wave signal into a sinusoidal wave signal so as to ensure the sine degree of output voltage; when the load is in arc, the resonant filter module can inhibit the output current from rising rapidly, so that the generation of current arc is effectively inhibited.
The circuit topology diagram of the resonant filter module and the boost module is shown in fig. 2, where the resonant filter module may include a first filter circuit, a second filter circuit, and a third filter circuit;
the input end of the first filter circuit is connected with the inversion module, the output end of the first filter circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is respectively connected with the positive input end of the boosting module and the input end of the third filter circuit, and the output end of the third filter circuit is connected with the negative input end of the boosting module.
Specifically, as shown in fig. 2, the positive input end of the first filter circuit is connected with the positive output end ac+ of the inversion module, the negative input end is connected with the negative output end AC-of the inversion module, the positive output end and the negative output end of the first filter circuit are correspondingly connected with the positive input end and the negative input end of the second filter circuit, the positive output end of the second filter circuit is connected with the positive input end of the boost module, the negative output end is connected with the input end of the third filter circuit, and the output end of the third filter circuit is connected with the negative input end of the boost module. The second filter circuit is a parallel resonant circuit, and the third filter circuit is a series resonant circuit.
In a specific implementation, the resonant frequency f of the resonant filter module R Can be set to a switching frequency f with the inverter module s In agreement, i.e
Wherein L represents the effective inductance of the resonant filter module, and C represents the effective capacitance of the resonant filter module.
The resonant filter module is used as a three-stage resonant filter circuit, and is subjected to three-time filter treatment sequentially through the first filter circuit, the second filter circuit and the third filter circuit, so that alternating current square wave signals with symmetrical positive and negative pulses are effectively filtered, ripple waves and noise of the voltage are weakened to a greater extent, the output sine wave signals have very low THD (Total Harmonic Distortion ) values, and the sine degree of the output waveforms is guaranteed.
In the main power circuit of the embodiment, the direct current is inverted and processed into square wave signals by the inversion module through the rectification module, the inversion module, the resonance filtering module and the boosting module which are sequentially connected, and then three-level resonance filtering is carried out on the square wave signals through the resonance filtering module to obtain sine wave signals; the three-level resonance mode is adopted to filter the square wave signal into the sine wave signal, when the plasma load generates an arc, the softness of the sine wave signal waveform and the resonance inductance contained in the three-level resonance mode can effectively inhibit the load from generating a current arc, and the number of the arcs generated in unit time is improved.
Example two
On the basis of the first embodiment, this embodiment further proposes a main power circuit.
Further, as shown in fig. 3, which is a circuit topology diagram of the rectifying module, the rectifying module may include a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, and a capacitor C7;
the positive pole of the diode D1 and the negative pole of the diode D2 are connected with a first phase of a three-phase alternating current power grid, the positive pole of the diode D3 and the negative pole of the diode D4 are connected with a second phase of the three-phase alternating current power grid, the positive pole of the diode D5 and the negative pole of the diode D6 are connected with a third phase of the three-phase alternating current power grid, the negative pole of the diode D1, the negative pole of the diode D3, the negative pole of the diode D5 and one end of the capacitor C7 are connected with a positive input end of the inversion module, and the positive pole of the diode D2, the positive pole of the diode D4, the positive pole of the diode D6 and the other end of the capacitor C7 are connected with a negative input end of the inversion module.
Specifically, the anode of the diode D1 and the cathode of the diode D2 are both connected with R, the anode of the diode D3 and the cathode of the diode D4 are both connected with S, the anode of the diode D5 and the cathode of the diode D6 are both connected with T, the connection points of the cathode of the diode D1, the cathode of the diode D3, the cathode of the diode D5 and one end of the capacitor C7 are used as the positive output end dc+ of the rectifying module and are connected with the positive input end of the inverting module, and the connection points of the anode of the diode D2, the anode of the diode D4, the anode of the diode D6 and the other end of the capacitor C7 are used as the negative output end DC-of the rectifying module and are connected with the negative input end of the inverting module.
The rectification module adopts diode uncontrolled rectification to convert three-phase alternating current into biphase direct current, the wiring is simple, the capacitor C7 is used as a filter capacitor, and the stability of the direct current output by the rectification module is ensured.
Further, as shown in fig. 4, which is a circuit topology diagram of the inverter module, the inverter module may include a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4;
the drain electrode of the switch tube Q1 and the drain electrode of the switch tube Q3 are connected with the positive output end of the rectifying module, the source electrode of the switch tube Q2 and the source electrode of the switch tube Q4 are connected with the negative output end of the rectifying module, the source electrode of the switch tube Q1 and the drain electrode of the switch tube Q2 are connected with the positive input end of the resonance filtering module, and the source electrode of the switch tube Q3 and the drain electrode of the switch tube Q4 are connected with the negative input end of the resonance filtering module.
Specifically, the drain electrode of the switching tube Q1 and the drain electrode of the switching tube Q3 are both connected with the positive output end dc+ of the rectifying module, the source electrode of the switching tube Q2 and the source electrode of the switching tube Q4 are both connected with the negative output end DC-of the rectifying module, the connection point of the source electrode of the switching tube Q1 and the drain electrode of the switching tube Q2 is used as the positive output end ac+ of the inverting module and is connected with the positive input end of the resonant filter module, and the connection point of the source electrode of the switching tube Q3 and the drain electrode of the switching tube Q4 is used as the negative output end AC-of the inverting module and is connected with the negative input end of the resonant filter module. The four switching tubes can be switched on and off according to a certain rule, the on-off control of the switching tubes can be realized by an external control device, and the on-off switching of the four switching tubes is used for converting the biphasic direct current into biphasic alternating current and outputting alternating current square wave signals with symmetrical positive and negative pulses.
Further, the switching transistor Q1, the switching transistor Q2, the switching transistor Q3, and the switching transistor Q4 may employ a metal oxide semiconductor field effect transistor (MOS transistor) or an insulated gate bipolar transistor (IGBT transistor).
The MOS tube and the IGBT tube can be used as power switch tubes to realize power switching control.
In particular, the main power circuit may be connected to a control module (not shown in the figures);
the control module can be respectively connected with the grid electrode of the switch tube Q1, the grid electrode of the switch tube Q2, the grid electrode of the switch tube Q3 and the grid electrode of the switch tube Q4, and is used for generating an enabling signal, outputting the enabling signal to the inversion module and controlling the inversion module to work.
The control module outputs an enabling signal to each switching tube to control the corresponding switching tube to be switched on or off, and can also control the inversion module to switch according to the set switching frequency f s To control the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 to realize switching on.
Still further, as shown in fig. 2, the first filter circuit may include an inductor L1 and a capacitor C1;
one end of an inductor L1 is connected with a positive output end AC+ of the inversion module, the other end of the inductor L1 is connected with a positive input end of the second filter circuit, one end of a capacitor C1 is connected with a negative output end AC-of the inversion module, and the other end of the capacitor C1 is connected with a negative input end of the second filter circuit.
Still further, as shown in fig. 2, the second filter circuit may include a capacitor C2 and an inductor L2;
one end of the capacitor C2 and one end of the inductor L2 are connected with the positive output end of the first filter circuit and the positive input end of the boost module; the other end of the capacitor C2 and the other end of the inductor L2 are connected with the negative output end of the first filter circuit and the input end of the third filter circuit.
The second filter circuit is used as a parallel resonance circuit, wherein the capacitor C2 is a parallel resonance capacitor, and the inductor L2 is a parallel resonance inductor.
Still further, as shown in fig. 2, the third filter circuit may include a capacitor C3 and an inductor L3;
one end of a capacitor C3 is connected with the negative output end of the second filter circuit, the other end of the capacitor C3 is connected with one end of an inductor L3, and the other end of the inductor L3 is connected with the negative input end of the boosting module.
The third filter circuit is used as a series resonant circuit, wherein the capacitor C3 is a series resonant capacitor, and the inductor L3 is a series resonant inductor.
Still further, as shown in fig. 2, the boost module may include a transformer T1;
the positive input end of the transformer T1 is connected with the positive output end of the second filter circuit, the negative input end of the transformer T1 is connected with the output end of the third filter circuit, the positive output end Vout+ of the transformer T1 is connected with the positive electrode of the load, and the negative output end Vout-of the transformer T1 is connected with the negative electrode of the load.
The positive output end Vout+ of the transformer T1 is the positive output end of the AC coating power supply where the main power circuit is located, and the negative output end Vout-of the transformer T1 is the negative output end of the AC coating power supply where the main power circuit is located.
After resonant filtering, the voltage is boosted and connected to a load end through a transformer T1, and the transformer T1 has the function of realizing output voltage boosting on one hand and load impedance matching on the other hand.
The working principle of the embodiment is as follows:
fig. 5 is a schematic diagram showing changes in output voltage and output current of the main power circuit, wherein the horizontal axis represents time t and t1 represents time when an arc occurs. As can be seen from fig. 5, with respect to the plasma load, when an arc occurs, the load exhibits a negative impedance characteristic, and the output voltage U of the main power circuit is rapidly pulled down by the plasma load while the output current I rapidly rises.
When an arc occurs, the output voltage U is rapidly pulled down by the plasma load, and the voltage on the capacitor C2 in the second filter circuit serving as the parallel resonant circuit can be almost completely added to the third filter circuit serving as the series resonant circuit, and the voltage in the third filter circuit is the sum of the voltages at two ends of the inductor L3, namely
Wherein U is L3 Representing the voltage across inductor L3, U C3 Representing the voltage across capacitor C3, L 3 An inductance value of the inductance L3, t time, I 3 Representing the current output by inductor L3 to the boost module.
When the arc occurs, the worst condition is that the voltage of the capacitor C3 in the third filter circuit is zero, and at this time, the voltage on the capacitor C2 in the second filter circuit can be all added to the inductor L3 in the third filter circuit, and the current of the inductor L3 cannot be suddenly changed, so that the output current can be effectively inhibited from rapidly rising, that is, the generation of the current arc can be effectively inhibited.
In addition, when an arc occurs, the drop of the output voltage can be detected, at the moment, effective wave-sealing treatment can be simultaneously carried out, and the energy poured into the load end is at most the energy in the resonant cavity of the alternating current coating power supply where the main power circuit is located, and the energy is far smaller than the energy stored in the output capacitor of the existing voltage type coating power supply, so that the arc energy can be effectively restrained at the same time, and the damage to the surface of a workpiece is reduced.
The main power circuit of the embodiment improves the number of arcs generated in unit time and effectively inhibits the arc energy from the perspective of power topological structure design, thereby reducing the damage to the surface of a workpiece. The improvement of the power topology also enables simplifying the design in terms of control parameters in order to focus the design on more critical locations.
Example III
The present embodiment proposes an ac plating power supply including the main power circuit of the first or second embodiment.
Further, the ac plating power supply may further include:
the control module is connected with the inversion module in the main power circuit, and is particularly connected with the grid electrode of the switching tube Q1, the grid electrode of the switching tube Q2, the grid electrode of the switching tube Q3 and the grid electrode of the switching tube Q4 respectively, and is used for generating an enabling signal and outputting the enabling signal to the inversion module to control the inversion module to work.
The alternating current coating power supply of the embodiment is a sinusoidal output alternating current coating power supply, is different from a voltage type direct current coating power supply and a voltage type square wave coating power supply, and can effectively inhibit arc energy and reduce damage to the surface of a workpiece.
It should be noted that, the specific structure of the main power circuit may refer to the above embodiments, and since this embodiment adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are provided, and will not be described in detail herein.
The main power circuit and the alternating current coating power supply provided by the utility model adopt three-stage LC resonance filtering, so that alternating current square waves can be effectively filtered into sine waves with extremely low THD content, and the sine degree of output voltage is ensured; when an arc occurs to a load, the output current is restrained from rising rapidly through an inductor L3 in a third filter circuit serving as a series resonant circuit in three-stage LC resonance filtering, so that the generation of a current arc is restrained effectively; meanwhile, as the energy of the resonant cavity is far smaller than the energy stored in the output capacitor of the traditional voltage type coating power supply, the arc energy can be effectively restrained, and the damage of a coated workpiece is reduced.
It should be noted that, the foregoing reference numerals of the embodiments of the present utility model are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings under the concept of the present utility model, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.
Claims (10)
1. The main power circuit is characterized by comprising a rectifying module, an inversion module, a resonance filtering module and a boosting module which are sequentially connected;
the resonance filtering module comprises a first filtering circuit, a second filtering circuit and a third filtering circuit;
the input end of the first filter circuit is connected with the inversion module, the output end of the first filter circuit is connected with the input end of the second filter circuit, the output end of the second filter circuit is respectively connected with the positive input end of the boosting module and the input end of the third filter circuit, and the output end of the third filter circuit is connected with the negative input end of the boosting module;
the inversion module is used for inverting the direct current into a square wave signal, and the resonance filtering module is used for performing three-stage resonance filtering on the square wave signal to obtain a sine wave signal.
2. The main power circuit of claim 1, wherein the rectifying module comprises a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, and a capacitor C7;
the positive pole of the diode D1 and the negative pole of the diode D2 are all connected with a first phase of a three-phase alternating current power grid, the positive pole of the diode D3 and the negative pole of the diode D4 are all connected with a second phase of the three-phase alternating current power grid, the positive pole of the diode D5 and the negative pole of the diode D6 are all connected with a third phase of the three-phase alternating current power grid, the negative pole of the diode D1, the negative pole of the diode D3, the negative pole of the diode D5 and one end of the capacitor C7 are all connected with a positive input end of the inversion module, and the positive pole of the diode D2, the positive pole of the diode D4, and the other end of the capacitor C7 are all connected with a negative input end of the inversion module.
3. The main power circuit of claim 1, wherein the inverter module comprises a switching tube Q1, a switching tube Q2, a switching tube Q3, and a switching tube Q4;
the drain electrode of the switch tube Q1 and the drain electrode of the switch tube Q3 are connected with the positive output end of the rectifying module, the source electrode of the switch tube Q2 and the source electrode of the switch tube Q4 are connected with the negative output end of the rectifying module, the source electrode of the switch tube Q1 and the drain electrode of the switch tube Q2 are connected with the positive input end of the resonance filtering module, and the source electrode of the switch tube Q3 and the drain electrode of the switch tube Q4 are connected with the negative input end of the resonance filtering module.
4. The main power circuit of claim 3, wherein said switching transistor Q1, said switching transistor Q2, said switching transistor Q3 and said switching transistor Q4 are metal oxide semiconductor field effect transistors or insulated gate bipolar transistors.
5. The main power circuit of claim 1, wherein the first filter circuit comprises an inductance L1 and a capacitance C1;
one end of the inductor L1 is connected with the positive output end of the inversion module, the other end of the inductor L1 is connected with the positive input end of the second filter circuit, one end of the capacitor C1 is connected with the negative output end of the inversion module, and the other end of the capacitor C1 is connected with the negative input end of the second filter circuit.
6. The main power circuit of claim 5, wherein said second filter circuit comprises a capacitor C2 and an inductance L2;
one end of the capacitor C2 and one end of the inductor L2 are connected with the positive output end of the first filter circuit and the positive input end of the boost module; the other end of the capacitor C2 and the other end of the inductor L2 are connected with the negative output end of the first filter circuit and the input end of the third filter circuit.
7. The main power circuit of claim 6, wherein the third filter circuit comprises a capacitor C3 and an inductance L3;
one end of the capacitor C3 is connected with the negative output end of the second filter circuit, the other end of the capacitor C3 is connected with one end of the inductor L3, and the other end of the inductor L3 is connected with the negative input end of the boost module.
8. The main power circuit of claim 7, wherein the boost module comprises a transformer T1;
the positive input end of the transformer T1 is connected with the positive output end of the second filter circuit, the negative input end of the transformer T1 is connected with the output end of the third filter circuit, the positive output end of the transformer T1 is connected with the positive electrode of the load, and the negative output end of the transformer T1 is connected with the negative electrode of the load.
9. An ac coated power supply comprising a main power circuit as claimed in any one of claims 1 to 8.
10. The ac coated power supply of claim 9, wherein the power supply further comprises:
the control module is respectively connected with the grid electrode of the switch tube Q1, the grid electrode of the switch tube Q2, the grid electrode of the switch tube Q3 and the grid electrode of the switch tube Q4, and is used for generating an enabling signal and outputting the enabling signal to the inversion module to control the inversion module to work.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117526727A (en) * | 2023-11-08 | 2024-02-06 | 广东省麦思科学仪器创新研究院 | Plasma power supply feedback circuit, feedback method and plasma power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117526727A (en) * | 2023-11-08 | 2024-02-06 | 广东省麦思科学仪器创新研究院 | Plasma power supply feedback circuit, feedback method and plasma power supply |
| CN117526727B (en) * | 2023-11-08 | 2024-05-24 | 广东省麦思科学仪器创新研究院 | Plasma power supply feedback circuit, feedback method and plasma power supply |
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