Energy-saving type wire cutting pulse power supply

Abstract

The utility model provides an energy-saving type wire cutting pulse power supply which comprises a voltage source and a one-way pulse generating circuit, the voltage source is used for providing electric energy for one-way pulses, the one-way pulse generating circuit comprises an energy storage inductor, a current detection element, a plurality of clamping diodes and a plurality of MOS tubes, the MOS tubes are connected and disconnected to generate a plurality of pulse loops, and the current detection element is connected with the energy storage inductor. Forward pulses are generated in an inductive energy storage and constant-current discharge mode and used for providing a forward power supply between a workpiece and a molybdenum wire, unidirectional pulses are generated in the inductive energy storage and constant-current discharge mode, and a current-free resistor is arranged, so that the energy-saving effect is achieved; the unidirectional pulse output current rises rapidly, the bursting force of generated electric sparks is higher, and machining of thick workpieces is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of wire cutting, and particularly relates to an energy-saving wire cutting pulse power supply. BACKGROUND

[0002] The traditional wire cutting pulse power supply with resistance has large power loss of current-limiting resistance and low power conversion utilization rate, and the pulse power supply without resistance has significant energy-saving effect, the existing pulse power supply without resistance has slow output current climbing speed and low blasting force of electric spark, which is not conducive to cutting thick workpieces. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the utility model aims at providing an energy-saving wire cutting pulse power supply to solve the difficulties of the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides an energy-saving wire cutting pulse power supply, which comprises:

[0005] An energy-saving wire cutting pulse source comprises an input voltage source Vi, a unidirectional pulse generation circuit connected with the input voltage source Vi, the input voltage source provides unidirectional pulse power, the unidirectional pulse generation circuit comprises an energy storage inductor, a current detection element, a plurality of clamping diodes and a plurality of MOS tubes, the plurality of MOS tubes are switched on and off to generate a plurality of pulse loops, and the unidirectional power supply between a workpiece and molybdenum wire is provided in a constant current mode.

[0006] Further, the unidirectional pulse generation circuit further comprises an inductor L1, a current detection element A, a diode D1, a diode D2, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4 and a MOS tube Q5, wherein the D pole of the MOS tube Q1 is connected with a bus Vi+, and the S pole is connected with the current input end of the inductor L1; the D pole of the MOS tube Q2 is connected with the S pole of Q1, and the S pole is connected with a bus Vi-; the current output end of the current detection element A is connected with the current input end of the inductor L1, the current output end of the current detection element A is connected with the D pole of the MOS tube Q3 and the S pole of the MOS tube Q4, the S pole of the MOS tube Q3 is connected with the bus Vi-, and the D pole of the MOS tube Q4 is connected with the workpiece; the D pole of the MOS tube Q5 is connected with the molybdenum wire, and the S pole is connected with the bus Vi-; the positive pole of the diode D1 is connected with the workpiece, the negative pole is connected with the bus Vi+, the positive pole of the diode D2 is connected with the molybdenum wire, and the negative pole is connected with the bus Vi+.

[0007] Further, the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q5 in the unidirectional pulse generation circuit serve as switch tubes of the pulse generation circuit, switch the conduction state of the MOS tube, generate different loops, including loop I, loop II, loop III, loop IV, loop V, loop VI and loop VII, and the MOS tube Q4 serves as an isolating switch.

[0008] Compared with the prior art, the utility model has the following beneficial effects: one-way pulse is generated by inductance energy storage, constant current discharge mode, infinite current resistance, and energy saving effect is achieved; one-way pulse output current rises rapidly, and the blasting force of electric spark is higher, which is beneficial to processing thick workpieces.

[0009] The optimal embodiments of the utility model will be described in more detail below with reference to the drawings, so that the features and advantages of the utility model can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The circuit schematic diagram of the patent; DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the technical scheme of the utility model clearer, the technical scheme of the utility model embodiments will be described clearly and completely below with reference to the drawings of the specific embodiments of the utility model. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0012] Compared with the embodiments shown in the drawings, the feasible implementation schemes within the protection scope of the utility model can have fewer components, other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as multiple separate components.

[0013] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the specification and claims of the present utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not necessarily indicate a quantity limitation. Words such as "include" or "comprising" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0014] The present invention will now be further described with reference to the accompanying drawings.

[0015] An embodiment provides an energy-saving wire cutting pulse source, including: an input voltage source Vi and a unidirectional pulse generating circuit. The input voltage source provides unidirectional pulse electrical energy, and an input filter capacitor C1 is connected between its positive pole Vi+ and negative pole Vi-; the unidirectional pulse generating circuit generates pulses to provide a positive power supply between the workpiece and the molybdenum wire (the workpiece is connected to the positive pole and the molybdenum wire is connected to the negative pole).

[0016] like Figure 1 As shown, the unidirectional pulse generating circuit includes: MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, MOS transistor Q5, diode D1, diode D2, inductor L1, and current detection element A.

[0017] The D pole of MOS transistor Q1 is connected to busbar Vi+, and its S pole is connected to the current input end of inductor L1; the D pole of MOS transistor Q2 is connected to the S pole of Q1, and its S pole is connected to busbar Vi-; the S pole of MOS transistor Q3 is connected to busbar Vi-, and its D pole is connected to the output end of current detection element A; the S pole of MOS transistor Q4 is connected to the D pole of Q3, and its D pole is connected to a workpiece; the D pole of MOS transistor Q5 is connected to a molybdenum wire, and its S pole is connected to busbar Vi-; the positive pole of diode D1 is connected to the workpiece, and its negative pole is connected to busbar Vi+; the positive pole of diode D2 is connected to the molybdenum wire, and its negative pole is connected to busbar Vi+; the current output end of inductor L1 is connected to the input end of current detection element A.

[0018] Regarding the unidirectional pulse generating circuit: When the pulse power supply receives the pulse output instruction, the MOS tube Q4 is always in the normally on state. The MOS tubes Q1, Q2, Q3, and Q5 act as switch tubes of the unidirectional pulse generating circuit, controlling the switching of the MOS tube conduction state, generating the following circuit:

[0019] 1) Loop I: MOS Q1 is on, MOS Q2 is off, MOS Q3 is on, MOS Q5 is off, current flows from Vi+ through MOS Q1, inductor L1, current detection element A, MOS Q3 back to Vi-, because the start potential of the loop is higher than the end potential, the inductor L1 current increases, at this time there is no pulse current in the load.

[0020] 2) Loop II: MOS Q1 is off, MOS Q2 is on, MOS Q3 is on, MOS Q5 is off, current flows from Vi- through MOS Q2, inductor L1, current detection element A, MOS Q3 back to Vi-, because the start potential of the loop is the same as the end potential and the entire loop is low resistance, the inductor L1 current slowly decreases due to loop loss, at this time there is also no pulse current in the load.

[0021] 3) Loop III: MOS Q1 is on, MOS Q2 is off, MOS Q3 is off, MOS Q5 is on, current flows from Vi+ through MOS Q1, inductor L1, current detection element A, MOS Q4, and then outputs to the load, if the load forms a discharge or short circuit, current flows through the workpiece, molybdenum wire, MOS Q5 back to Vi-, because the start potential of the loop is higher than the end potential, the inductor L1 current increases, at this time there is a pulse current in the load.

[0022] 4) Loop IV: MOS Q1 is off, MOS Q2 is on, MOS Q3 is off, MOS Q5 is on, current flows from Vi- through MOS Q2, inductor L1, current detection element A, MOS Q4, and then outputs to the load, if the load forms a discharge or short circuit, current flows through the workpiece, molybdenum wire, MOS Q5 back to Vi-, because the start potential of the loop is the same as the end potential, if the load is short-circuited, the entire loop is low resistance, the inductor L1 current slowly decreases, if a discharge is formed, the entire loop is not low resistance, the inductor L1 current rapidly decreases, at this time there is also a pulse current in the load.

[0023] 5) Loop V: MOS Q1 is on, MOS Q2 is off, MOS Q3 is off, MOS Q5 is on, current flows from Vi+ through MOS Q1, inductor L1, current detection element A, MOS Q4, and then outputs to the load, if the load is open, current flows through the bleed resistor R2, MOS Q5 back to Vi-, the workpiece potential rises rapidly, when it exceeds Vi, diode D1 is turned on, the workpiece potential is clamped at Vi, after that most of the current flows through D1 back to Vi+, because the start potential of the loop is the same as the end potential and is low resistance, the inductor L1 current slowly decreases, at this time there is no pulse current in the load.

[0024] 6) Loop VI: MOS tube Q1 is off, MOS tube Q2 is on, MOS tube Q3 is off, MOS tube Q5 is on, current flows from Vi- through MOS tube Q2, inductor L1, current detection element A, MOS tube Q4, and then output to the load, if the load is open circuit, the current flows through the discharge resistor R2 and MOS tube Q5 and then returns to Vi-, the workpiece potential rises rapidly, when it exceeds Vi, diode D1 is turned on, the workpiece potential is clamped at Vi, then most of the current flows through D1 back to Vi+, since the loop starting potential is lower than the terminal potential, the inductor L1 current decreases rapidly, at this time there is also no pulse current in the load.

[0025] 7) Loop VII: at the moment of pulse termination, MOS tube Q3 is on, MOS tube Q5 is off, the current between the workpiece and the molybdenum wire flows from Vi- through MOS tube Q3, MOS tube Q4, workpiece, molybdenum wire, diode D2 back to Vi+ and is discharged rapidly, the molybdenum wire potential is clamped at Vi, avoiding overvoltage breakdown of Q5.

[0026] By controlling the switching state of the complementary working MOS tubes Q1 and Q2, the current of the inductor L1 can be controlled in a very small range, so that the discharge current during positive pulse output is close to constant current.

[0027] By controlling the switching state of the MOS tube Q3, the presence or absence of pulse output can be controlled, Q3 is off, there is pulse output, Q3 is on, there is no pulse output.

[0028] When the pulse power receives the instruction to stop pulse output, MOS tube Q4 is always off, and the body diode in MOS tube Q4 plays a role of isolating the workpiece and the internal circuit.

[0029] The above embodiments only exemplarily illustrate the principle and effect of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An energy-saving wire-cut pulse power supply, characterized in that: include: An input voltage source Vi and a unidirectional pulse generating circuit connected to the input voltage source Vi, wherein the input voltage source provides unidirectional pulse electrical energy, the unidirectional pulse generating circuit comprising an inductor L1, a current detection element A, a plurality of clamping diodes, and a plurality of MOS transistors, wherein the plurality of clamping diodes comprise diodes D1 and D2, and the MOS transistors comprise MOS transistors Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, and MOS transistor Q5, wherein the D pole of MOS transistor Q1 is connected to busbar Vi+, and the S pole is connected to the current input end of inductor L1; the D pole of MOS transistor Q2 is connected to the S pole of Q1, and the S pole is connected to busbar Vi-; the current output end of inductor L1 is connected to the current input end of current detection element A, the current output end of current detection element A is connected to the D pole of MOS transistor Q3 and the S pole of MOS transistor Q4, the S pole of MOS transistor Q3 is connected to busbar Vi-, and MOS transistor Q5 is connected to the S pole of MOS transistor Q5. The D pole of the tube Q4 is connected to the workpiece; the D pole of the MOS tube Q5 is connected to the molybdenum wire, and the S pole is connected to the busbar Vi-; the positive pole of the diode D1 is connected to the workpiece, and the negative pole is connected to the busbar Vi+; the positive pole of the diode D2 is connected to the molybdenum wire, and the negative pole is connected to the busbar Vi+. The multiple MOS tubes are turned on and off to generate a multi-path pulse circuit, providing a unidirectional power supply between the workpiece and the molybdenum wire in a constant current manner.

2. The energy-saving wire-cut pulse power supply according to claim 1, characterized in that: The feature is that MOS transistors Q1, Q2, Q3, and Q5 in the unidirectional pulse generating circuit act as switching transistors of the pulse generating circuit, controlling the switching of the conduction states of the MOS transistors to generate different loops, including Loop I, Loop II, Loop III, Loop IV, Loop V, Loop VI, and Loop VII. MOS transistor Q4 acts as an isolation switch.

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