Contactless high-efficiency power-saving electromagnetic chuck power supply circuit outputting pure direct current

Abstract

The utility model discloses a contactless high-efficiency power-saving electromagnetic chuck power supply circuit capable of outputting pure direct current, and belongs to the field of electromagnetic chuck power supply circuits. The electromagnetic chuck power supply circuit comprises an alternating current input power supply, a circuit breaker, a rectifier bridge, a buffer circuit, a step-down circuit, a bleeder circuit, an electromagnetic chuck and a switching circuit used for forward and reverse voltage switching of the electromagnetic chuck, and the input end of the circuit breaker is connected with the output end of the alternating current input power supply. The input end of the rectifier bridge is connected with the output end of the circuit breaker, the input end of the buffer circuit is connected with the positive electrode of the rectifier bridge, and the input end of the step-down circuit is connected with the output end of the buffer circuit. According to the electromagnetic chuck power supply circuit, when power supply to the electromagnetic chuck is finished, voltage rising at the moment of state switching of the electromagnetic chuck is discharged through the resistor 3 and the power switch tube 6, so that the situation that the switch circuit is broken down due to too high voltage is avoided, the service life of the electromagnetic chuck power supply circuit is prolonged, and the working safety is improved.

Description

Technical Field

[0001] This application relates to the technical field of electromagnetic chuck power supply circuits, and specifically to a contactless high-efficiency power-saving electromagnetic chuck power supply circuit that outputs pure direct current. Background Technique

[0002] The prior art is an AC input, and the electromagnetic chuck is powered by diode half-wave or thyristor half-wave or full-wave rectification. Since the output waveform is not pure direct current and contains a large amount of AC components, the suction force is smaller and the loss is larger when the same voltage is output compared with pure direct current.

[0003] Chinese Patent with publication number CN214506571U discloses a contactless high-efficiency power-saving electromagnetic chuck power supply circuit that outputs pure direct current. When this electromagnetic chuck power supply circuit is working, it outputs a pure direct current voltage, and then stabilizes the incoming current as direct current to improve efficiency. The positive and negative voltages are switched by a contactless power switch tube, which can avoid contact switching arcing and extend the service life. However, it is found through verification that the diode 2 used in it cannot perform freewheeling discharge when the electromagnetic chuck power supply voltage ends. At the moment of the electromagnetic chuck state switching, the state switching of the electromagnetic chuck will cause the voltage to rise instantaneously, resulting in the burning of the switching circuit, affecting the service life and working safety of the electromagnetic chuck power supply circuit.

[0004] Therefore, this application provides a contactless high-efficiency power-saving electromagnetic chuck power supply circuit that outputs pure direct current to solve the above problems. Utility Model Content

[0005] This application provides a contactless high-efficiency power-saving electromagnetic chuck power supply circuit that outputs pure direct current, aiming to solve the problem that the existing electromagnetic chuck power supply circuit is prone to burning of the switching circuit at the moment of the electromagnetic chuck state switching, affecting the service life and working safety of the electromagnetic chuck power supply circuit as proposed in the background technique.

[0006] To achieve the above object, the present application provides the following technical solution: A contactless high-efficiency power-saving electromagnetic chuck power supply circuit that outputs pure direct current, including an AC input power supply, a circuit breaker, a rectifier bridge, a buffer circuit, a buck circuit, a discharge circuit, an electromagnetic chuck, and a switch circuit for switching the positive and negative voltages of the electromagnetic chuck. The input end of the circuit breaker is connected to the output end of the AC input power supply, the input end of the rectifier bridge is connected to the output end of the circuit breaker, the input end of the buffer circuit is connected to the positive pole of the rectifier bridge, the input end of the buck circuit is connected to the output end of the buffer circuit, the input end of the discharge circuit is connected to the output end of the buck circuit, and the input end of the switch circuit is connected to the output end of the discharge circuit; The buck circuit includes a power switch tube 1, an inductor, and a diode. One end of the power switch tube 1 is connected to the output end of the buffer circuit, and the other end is connected to one end of the inductor and the cathode of the diode. The anode of the diode is connected to the negative pole of the rectifier bridge.

[0007] Different from the existing electromagnetic chuck power supply circuit: The switch circuit includes a power switch tube 2, a power switch tube 3, a power switch tube 4, and a power switch tube 5. Both the power switch tube 2 and the power switch tube 4 are connected to the end of the inductor far from the power switch tube 1. One ends of the power switch tube 5 and the power switch tube 3 are respectively connected to the other ends of the power switch tube 2 and the power switch tube 4. The other ends of the power switch tube 5 and the power switch tube 3 are both connected to the negative pole of the rectifier bridge; One end of the electromagnetic chuck is connected between the power switch tube 2 and the power switch tube 5, and the other end is connected between the power switch tube 4 and the power switch tube 3; The discharge circuit includes a resistor 2, a resistor 3, and a power switch tube 6. One ends of the resistor 2 and the resistor 3 are both connected to the other end of the inductor. The other end of the resistor 2 is connected to the negative pole of the rectifier bridge for discharging the charge during no-load; The other end of the resistor 3 is connected to one end of the power switch tube 6, and the other end of the power switch tube 6 is connected to the negative pole of the rectifier bridge for discharging the voltage at the moment of the electromagnetic chuck state switching. In this way, the voltage rising at the moment of the electromagnetic chuck state switching is discharged through the resistor 3 and the power switch tube 6, thereby avoiding the breakdown of the switch circuit caused by excessive instantaneous voltage, and improving the service life and working safety of the electromagnetic chuck power supply circuit.

[0008] Preferably, the buffer circuit includes a resistor 1 and a contactor. One end of the resistor 1 and one end of the normally open point of the contactor are both connected to the positive pole of the rectifier bridge. The other ends of the resistor 1 and the normally open point of the contactor are both connected to the power switch tube 1.

[0009] Preferably, the power supply circuit further includes a capacitor 1 for input filtering. One end of the capacitor 1 is connected to the resistor 1 and the normally open point of the contactor, which is far from the rectifier bridge, and the other end is connected to the negative pole of the rectifier bridge.

[0010] Preferably, the power supply circuit further includes a capacitor 2 for output filtering. One end of the capacitor 2 is connected to the end of the inductor far from the power switch 1, and the other end is connected to the negative pole of the rectifier bridge.

[0011] Preferably, the power switch 2, power switch 3, power switch 4, and power switch 5 are all contactless power switches.

[0012] This electromagnetic chuck power supply circuit has the advantages of high efficiency and low energy consumption. At the moment when the electromagnetic chuck finishes sucking and discharging materials, the voltage that rises instantaneously during the state switching of the electromagnetic chuck is discharged through the resistor 3 and the power switch 6, thereby avoiding the breakdown of the switching circuit caused by the excessive voltage at the moment of the electromagnetic chuck state switching, and further improving the service life and working safety of the electromagnetic chuck power supply circuit; and when it is working, it outputs a pure DC voltage, so that the current entering it is stabilized as DC to improve efficiency, and the positive and negative voltages are switched through the contactless power switch, extending the service life. Description of the Drawings

[0013] Figure 1 It is a circuit schematic diagram of a contactless high-efficiency power-saving type electromagnetic chuck power supply circuit that outputs pure DC. Detailed Embodiments

[0014] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0015] The present application provides a contactless high-efficiency power-saving type electromagnetic chuck power supply circuit that outputs pure DC, as Figure 1As shown in the figure, the power supply circuit of the electromagnetic chuck includes an AC input power supply, a circuit breaker, a rectifier bridge, a buffer circuit, a buck circuit, a discharge circuit, an electromagnetic chuck, and a switching circuit for switching the positive and negative voltages of the electromagnetic chuck. The input end of the circuit breaker is connected to the output end of the AC input power supply. The input end of the rectifier bridge is connected to the output end of the circuit breaker. The input end of the buffer circuit is connected to the positive pole of the rectifier bridge. The input end of the buck circuit is connected to the output end of the buffer circuit. The input end of the discharge circuit is connected to the output end of the buck circuit. The input end of the switching circuit is connected to the output end of the discharge circuit. The buck circuit includes a power switch tube 1, an inductor, and a diode. One end of the power switch tube 1 is connected to the output end of the buffer circuit, and the other end is connected to one end of the inductor and the cathode of the diode. The anode of the diode is connected to the negative pole of the rectifier bridge. The switching circuit includes a power switch tube 2, a power switch tube 3, a power switch tube 4, and a power switch tube 5. Both the power switch tube 2 and the power switch tube 4 are connected to the end of the inductor far from the power switch tube 1. One ends of the power switch tube 5 and the power switch tube 3 are respectively connected to the other ends of the power switch tube 2 and the power switch tube 4. The other ends of the power switch tube 5 and the power switch tube 3 are both connected to the negative pole of the rectifier bridge. One end of the electromagnetic chuck is connected between the power switch tube 2 and the power switch tube 5, and the other end is connected between the power switch tube 4 and the power switch tube 3. The discharge circuit includes a resistor 2, a resistor 3, and a power switch tube 6. One ends of the resistor 2 and the resistor 3 are both connected to the other end of the inductor. The other end of the resistor 2 is connected to the negative pole of the rectifier bridge for discharging the charge during no-load. The other end of the resistor 3 is connected to one end of the power switch tube 6, and the other end of the power switch tube 6 is connected to the negative pole of the rectifier bridge for discharging the voltage at the moment of the state switching of the electromagnetic chuck.

[0016] Among them, in order to improve the safety of the power supply circuit of the electromagnetic chuck, the buffer circuit includes a resistor 1 and a contactor. One end of the resistor 1 and one end of the normally open point of the contactor are both connected to the positive pole of the rectifier bridge. The other ends of the resistor 1 and the normally open point of the contactor are both connected to the power switch tube 1.

[0017] Among them, the AC input power supply is single-phase or three-phase alternating current; the rectifier bridge is a single-phase rectifier bridge or a three-phase rectifier bridge; Power switch tube 1 / Power switch tube 2 / Power switch tube 3 and Power switch tube 4 / Power switch tube 5 / Power switch tube 6: A single IGBT or a single mos tube can be used, or multiple IGBTs can be connected in parallel, or multiple mos tubes can be connected in parallel. The IGBT or mos tube should have a built-in freewheeling diode.

[0018] It should be noted that the state switching of the electromagnetic chuck refers to the states of the electromagnetic chuck at the end of material picking and at the end of material placing, that is, the moment of state switching of the electromagnetic chuck is the moment from the start to the end of material picking by the electromagnetic chuck and the moment from the start to the end of material placing by the electromagnetic chuck.

[0019] It is worth mentioning that, in order to extend the service life of the switching circuit, the power switching transistors 2, 3, 4, and 5 are all contactless power switching transistors, which can effectively avoid contact switching arcing and extend their service life.

[0020] When the electromagnetic chuck picks up materials, turn on the power switching transistors 2 and 3; at this time, the power switching transistors 4 and 5 are turned off, and then turn on the power switching transistor 1. The step-down circuit composed of the inductor, diode, and capacitor 2 supplies power to the electromagnetic chuck with a positive output. When the electromagnetic chuck finishes picking up materials, turn off the power switching transistor 1, and then turn off the power switching transistors 2 and 3, and the electromagnetic chuck stops picking up materials; when the power switching transistors 2 and 3 are turned off instantaneously, the voltage rising at the moment of state switching of the electromagnetic chuck is discharged through the resistor 3 and the power switching transistor 6. When the electromagnetic chuck places materials, turn on the power switching transistors 4 and 5; at this time, the power switching transistors 2 and 3 are turned off, and then turn on the power switching transistor 1. The step-down circuit composed of the inductor, diode, and capacitor 2 supplies power to the electromagnetic chuck with a negative output. When the electromagnetic chuck finishes placing materials, turn off the power switching transistor 1, and then turn off the power switching transistors 4 and 5, and the electromagnetic chuck stops placing materials; when the power switching transistors 4 and 5 are turned off instantaneously, the voltage rising at the moment of state switching of the electromagnetic chuck is discharged through the resistor 3 and the power switching transistor 6.

[0021] Furthermore, in order to improve the stability of the control of the power supply circuit of the electromagnetic chuck, the power supply circuit further includes a capacitor 1 for input filtering and a capacitor 2 for output filtering. One end of the capacitor 1 is connected to the resistor 1 and the end of the normally open contact of the contactor away from the rectifier bridge, and the other end is connected to the negative pole of the rectifier bridge; one end of the capacitor 2 is connected to the end of the inductor away from the power switching transistor 1, and the other end is connected to the negative pole of the rectifier bridge.

[0022] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent substitutions or changes, and should be covered within the protection scope of the present application.

Claims

1. A contactless, high-efficiency, power-saving electromagnetic chuck power supply circuit outputting pure direct current, comprising an AC input power supply, a circuit breaker, a rectifier bridge, a buffer circuit, a step-down circuit, a discharge circuit, an electromagnetic chuck and a switch circuit for switching the forward and reverse voltages of the electromagnetic chuck, wherein the input end of the circuit breaker is connected to the output end of the AC input power supply, the input end of the rectifier bridge is connected to the output end of the circuit breaker, the input end of the buffer circuit is connected to the positive electrode of the rectifier bridge, the input end of the step-down circuit is connected to the output end of the buffer circuit, the input end of the discharge circuit is connected to the output end of the step-down circuit, and the input end of the switch circuit is connected to the output end of the discharge circuit; the step-down circuit comprises a power switch tube 1, an inductor and a diode, one end of the power switch tube 1 is connected to the output end of the buffer circuit, the other end is connected to one end of the inductor and the cathode of the diode, and the anode of the diode is connected to the negative electrode of the rectifier bridge; Features: The switch circuit includes a power switch tube 2, a power switch tube 3, a power switch tube 4 and a power switch tube 5. The power switch tube 2 and the power switch tube 4 are both connected to one end of the inductor away from the power switch tube 1, one end of the power switch tube 5 and the power switch tube 3 are respectively connected to the other end of the power switch tube 2 and the power switch tube 4, and the other end of the power switch tube 5 and the power switch tube 3 are both connected to the negative pole of the rectifier bridge; one end of the electromagnetic suction cup is connected between the power switch tube 2 and the power switch tube 5, and the other end is connected between the power switch tube 4 and the power switch tube 3; The discharge circuit includes a resistor 2, a resistor 3 and a power switch tube 6, one end of each of the resistors 2 and 3 is connected to the other end of the inductor, the other end of the resistor 2 is connected to the negative pole of the rectifier bridge for discharging charge when no-load; the other end of the resistor 3 is connected to one end of the power switch tube 6, and the other end of the power switch tube 6 is connected to the negative pole of the rectifier bridge for voltage discharge at the moment of switching the state of the electromagnetic suction cup.

2. The contactless, high-efficiency, power-saving electromagnetic chuck power supply circuit with pure direct current output according to claim 1, characterized in that: The buffer circuit includes a resistor 1 and a contactor, one end of the resistor 1 and one end of the normally open point of the contactor are both connected to the positive electrode of the rectifier bridge, and the other ends of the resistor 1 and the normally open point of the contactor are both connected to the power switch tube 1.

3. The contactless, high-efficiency, power-saving electromagnetic chuck power supply circuit with pure direct current output according to claim 2, characterized in that: The power supply circuit also includes a capacitor 1 for input filtering, one end of the capacitor 1 is connected to the resistor 1 and one end of the normally open point of the contactor away from the rectifier bridge, and the other end is connected to the negative electrode of the rectifier bridge.

4. The contactless, high-efficiency, power-saving electromagnetic chuck power supply circuit with pure direct current output according to claim 3, characterized in that: The power supply circuit further includes a capacitor 2 for output filtering, one end of the capacitor 2 is connected to the end of the inductor away from the power switch tube 1, and the other end is connected to the negative electrode of the rectifier bridge.

5. The contactless, high-efficiency, power-saving electromagnetic chuck power supply circuit with pure direct current output according to claim 1, characterized in that: The power switch tube 2 , the power switch tube 3 , the power switch tube 4 and the power switch tube 5 are all contactless power switch tubes.

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