Vibration table coil control circuit and vibration table

Abstract

The utility model discloses a vibration table coil control circuit and a vibration table. The vibration table coil control circuit comprises a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2. The switch tube TR1 and the switch tube TR2 are configured in a way that the switch tube TR1 and the switch tube TR2 are both closed when the vibration table coil works in a pull-in state; when the vibration table coil works in a turn-off state, the switch tube TR1 and the switch tube TR2 are both turned off. The vibration table coil control circuit further comprises an input voltage detection circuit which is used for connecting the L line and the N line, rectifying voltage input by the L line and the N line into pulsating direct current, detecting the magnitude of the pulsating direct current, outputting a first voltage signal, and outputting a second voltage signal. The vibration table works in a pull-in state when the first voltage signal is smaller than or equal to a first set value; according to the utility model, the vibration table can stably work in a set range.

Description

Technical Field

[0001] The utility model relates to electromagnetic control, in particular to a vibration table coil control circuit and a vibration table. Background Art

[0002] A vibration table is an electromagnetic device that uses electromagnetic force to generate vibration. Its basic principle is to use the law of electromagnetic induction and Newton's second law. Specifically: when a wire moves in a magnetic field, according to the law of electromagnetic induction, an induced electromotive force will be generated at both ends of the wire. The magnitude of this induced electromotive force is proportional to the speed of the wire in the magnetic field; if this induced electromotive force is connected to a resistor, then when it moves in the magnetic field, an electric current will be generated, and this current will generate a force in the opposite direction of the original movement, and this force will cause the wire to vibrate.

[0003] Vibration tables are widely used in the fields of aviation, aerospace, and shipbuilding. In the field of aviation, they are used to simulate the vibration environment of various aircraft, spacecraft, ships, etc. to test the performance and quality of these equipment. The core components of the vibration table are electromagnets, coils, and control circuits. The control circuit outputs a drive signal that can control the electromagnets and coils to continuously attract and quickly shut down, thereby vibrating the table. The control circuit can also control the vibration frequency and amplitude of the vibration table by adjusting the waveform of the drive signal.

[0004] The applicant of this application has proposed a method for controlling the vibration table coil. Figure 1 The vibration table coil control circuit shown includes a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2, an L line connection port is connected to the first input end of the rectifier bridge D1, a positive output end of the rectifier bridge D1 and one end of the capacitor C1 are connected together as a positive input end of the vibration table coil control circuit, an N line connection port is connected to the second input end of the rectifier bridge D1, a negative output end of the rectifier bridge D1 and the other end of the capacitor C1 are connected together as a negative input end of the vibration table coil control circuit, one end of the switch tube TR1 is connected to the positive input end of the vibration table coil control circuit, the other end of the switch tube TR1 is connected to one end of the vibration table coil L1, one end of the switch tube TR2 is connected to the other end of the vibration table coil L1, and the other end of the switch tube TR2 is connected to the negative input end of the vibration table coil control circuit; the switch tube TR1 and the switch tube TR2 are configured as follows: when the vibration table coil L1 works in the pull-in state, the switch tube TR1 and the switch tube TR2 are both closed; when the vibration table coil works in the shut-off state, the switch tube TR1 and the switch tube TR2 are both disconnected.

[0005] Figure 1In the shutdown phase of the circuit, both switching tubes are disconnected. The circuit also includes diodes D1 and D2. The coil energy is returned to the power grid through the path formed by the two diodes. The coil current of the vibration table is reduced to zero, so that the vibration table stops working quickly, which is beneficial to improving the reliability of the vibration table, and at the same time, energy is recovered to the capacitor, which is beneficial to reducing the active power consumption of the vibration table. However, the inventor of the present application also found that when the power is on multiple times, the peak current of the coil of the vibration table will change, thereby causing the amplitude of the vibration table to change.

[0006] It should be noted that in the present invention, the wire at one end of the capacitor C1 and the wire at the other end of the capacitor C1 are called busbars, and the voltage across the capacitor C1 is called busbar voltage; in addition, the control IC of the switch tubes TR1 and TR2 has a 0.5s anti-false triggering time, that is, when the enable signal of the control IC disappears, and the control IC is not under-voltage, and the drive signals of the switch tubes TR1 and TR2 have not disappeared, the control IC will continue to work for 0.5s.

[0007] The inventors of the present application conducted further research and found that the reason why the coil working current changes is that when the control IC of the switch tubes TR1 and TR2 is started in the above scheme, although the working frequency of the vibration table is consistent with the working frequency of the switch tubes TR1 and TR2 (both are AC power frequency), even if the generation time of the drive signals of the switch tubes TR1 and TR2 is fixed, the power-on time of the signal generator and the AC power cannot be completely synchronized, resulting in the voltage output by the positive output terminal of the rectifier bridge D1 being different in each cycle when the drive signals of the switch tubes TR1 and TR2 appear, so that the positive output terminal of the rectifier bridge D1 has different charging capabilities for the capacitor C1 at different times, so that the voltage at the positive input terminal of the vibration table coil control circuit fluctuates.

[0008] Assume that the self-induced electromotive force of the coil is U, the self-inductance coefficient of the coil is L (related to the coil itself), and the rate of change of the coil current with respect to time is dI / dt, then U=L*dI / dt, and thus dI=U*dt / L. Therefore, dI will fluctuate with the voltage fluctuation of the positive input terminal of the vibration table coil control circuit, thereby affecting the stability of the vibration table during operation. The switch tube TR1 and the switch tube TR2 control IC have a 0.5s anti-false triggering time. At this time, to ensure that the rising slope of the coil working current remains consistent in each switching stage, it is necessary to ensure that the self-induced electromotive force U of the coil remains unchanged or has the same change trend, so as to ensure that the trend of the coil current change in each working stage remains consistent.

[0009] Although the above problem can be solved by adding a capacitor to stabilize the voltage at the positive input terminal of the vibration table coil control circuit, the capacitance of the capacitor is limited and it is impossible to ensure that the voltage at the positive input terminal remains unchanged. Therefore, it is necessary to improve the above technology.

[0010] It should be noted that the above disclosure in the background technology section is Figure 1 The description and problem analysis are only intended to deepen the understanding of the overall background technology of the present application, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0011] In view of this, the technical problem to be solved by the present invention is to provide a vibration table coil control circuit and a vibration table, which can at least solve the deficiencies of the above technical problems to a certain extent.

[0012] The embodiment and technical scheme of the vibration table coil control circuit provided as the first aspect of the utility model are as follows:

[0013] A vibration table coil control circuit, comprising a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2, wherein an L line connection port is connected to a first input end of the rectifier bridge D1, a positive output end of the rectifier bridge D1 and one end of the capacitor C1 are connected together to form a positive input end of the vibration table coil control circuit, an N line connection port is connected to a second input end of the rectifier bridge D1, a negative output end of the rectifier bridge D1 and the other end of the capacitor C1 are connected together to form a negative input end of the vibration table coil control circuit; one end of the switch tube TR1 is connected to a positive input end of the vibration table coil control circuit, and the other end of the switch tube TR1 is used to connect one end of the vibration table coil, one end of the switch tube TR2 is used to connect the other end of the vibration table coil, and the other end of the switch tube TR2 is connected to a negative input end of the vibration table coil control circuit;

[0014] The switch tube TR1 and the switch tube TR2 are configured such that: when the vibration table coil is working in the pull-in state, the switch tube TR1 and the switch tube TR2 are both closed; when the vibration table coil is working in the shut-off state, the switch tube TR1 and the switch tube TR2 are both disconnected;

[0015] Wherein: the vibration table coil control circuit also includes an input voltage detection circuit, which is used to connect the L line and the N line, rectify the voltage input from the L line and the N line into a pulsating DC voltage, detect the magnitude of the pulsating DC voltage, and output a first voltage signal, so that the vibration table operates in an attracted state when the first voltage signal is less than or equal to a first set value.

[0016] Preferably, the input voltage detection circuit includes a rectifier bridge D1A, a resistor R2 and a resistor R3, the first input end of the rectifier bridge D1A is used to connect the L line, the second input end of the rectifier bridge D1A is used to connect the N line, the positive output end of the rectifier bridge D1A is connected to one end of the resistor R2, the other end of the resistor R2 and one end of the resistor R3 are connected together to output the first voltage signal, and the negative output end of the rectifier bridge D1A is connected to the other end of the resistor R3.

[0017] Furthermore, the vibration table coil control circuit also includes a coil current detection circuit, the coil current is connected to the loop where the vibration table coil is located, and is used to detect the current size in the vibration table coil and output a second voltage signal so that the vibration table operates in an off state when the second voltage signal is greater than or equal to a second set value.

[0018] Preferably, the coil current detection circuit is a resistor or a current transformer, which is connected between the other end of the switch tube TR2 and the negative input end of the vibration table coil control circuit.

[0019] Furthermore, the vibration table coil control circuit also includes a diode D1 and a diode D2, the anode of the diode D1 is connected to the other end of the switch tube TR1, the cathode of the diode D1 is connected to one end of the switch tube TR1, the anode of the diode D2 is connected to the other end of the switch tube TR2, and the cathode of the diode D2 is connected to the other end of the switch tube TR1.

[0020] Preferably, both the switch tube TR1 and the switch tube TR2 are MOS tubes.

[0021] The embodiment and technical solution of the vibration table provided as the second aspect of the utility model are as follows:

[0022] A vibration table comprises an electromagnet and a coil, wherein: the vibration table further comprises the vibration table coil control circuit described in any one of the first aspects above, which is used to control the coil to be attracted and turned off.

[0023] Preferably, the closing and opening of the switch tube K1 and the switch tube K2 are configured by a control IC and a single chip microcomputer.

[0024] Preferably, the control IC is SCM1503ASA.

[0025] The beneficial effects of the utility model are as follows:

[0026] (1) The technical solution of the embodiment of the utility model adds an input voltage detection circuit to the vibration table coil control circuit. The input voltage detection circuit connects the L line and the N line, rectifies the voltage input from the L line and the N line into a pulsating DC voltage, detects the magnitude of the pulsating DC voltage, and outputs a first voltage signal, so that the vibration table works in the pull-in state when the first voltage signal is less than or equal to the first set value. Since the magnitude of the pulsating DC voltage obtained by detecting the rectification controls the vibration table to work in the pull-in state when the first voltage signal is less than or equal to the first set value, it can ensure that the charging capacity of the AC power to the capacitor C1 remains unchanged during the pull-in process, and ensure that the voltage change trend of the positive input end of the vibration table coil control circuit remains unchanged in each switching stage, thereby ensuring that the coil working peak current remains basically unchanged, so that the vibration table can work stably within the set range, that is, adding the input voltage detection circuit can start the vibration table system when the AC power is input at a fixed phase at the beginning of each working cycle, and after the vibration table is started, it works with the input AC power voltage, thereby reducing the capacitance of the capacitor C1, and effectively reducing the ripple current of the capacitor C1, thereby improving the life of the capacitor;

[0027] (2) The technical solution of the embodiment of the utility model adds a coil working current detection circuit to the vibration table coil control circuit. The coil current is connected to the loop where the vibration table coil is located, and is used to detect the size of the vibration table coil working current, and output a second voltage signal, so that the vibration table works in the off state when the second voltage signal is greater than or equal to the second set value. Specifically, when the second voltage signal is greater than or equal to the second set value, the switch tube TR1 and the switch tube TR2 will enter the off state after a delay of 0.5s. During this 0.5s false touch time, since dI=U*dt / L, and dt and L are the same in each switching stage, with the help of the added input voltage detection circuit, U can be kept unchanged or the change amount of U can be consistent in each switching stage, so dI can be kept unchanged, thereby better ensuring that the coil working peak current remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A double-tube vibration table coil control circuit proposed by the inventor of this application;

[0029] Figure 2 A schematic diagram of a vibration table coil control circuit of the first embodiment of the utility model;

[0030] Figure 3 for Figure 2 A wiring diagram of a control chip and microcontroller used in the circuit. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0032] It should be noted that the terms "including" and "having" and any variations thereof described in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, the inclusion of a series of components, unit circuits or control timings is not necessarily limited to those components, unit circuits or control timings clearly listed, but may include components, unit circuits or control timings that are not clearly listed or inherent to these circuits.

[0033] In addition, the embodiments and features of the embodiments in this application may be combined with each other if there is no conflict.

[0034] It should be understood that, in the specification and the claims, when an element is described as being “connected” to another element, the element may be “directly connected” to the other element, or be “connected” to the other element through a third element; when a step is described as being continued to another step, the step may be directly continued to the other step, or be continued to the other step through a third step.

[0035] First embodiment

[0036] This embodiment provides a vibration table coil control circuit. Figure 2 This is a schematic diagram of the vibration table coil control circuit of the first embodiment of the utility model, see Figure 2 , wherein: it includes a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2, the L line connection port is connected to the first input end of the rectifier bridge D1, the positive output end of the rectifier bridge D1 and one end of the capacitor C1 are connected together as the positive input end of the vibration table coil control circuit, the N line connection port is connected to the second input end of the rectifier bridge D1, the negative output end of the rectifier bridge D1 and the other end of the capacitor C1 are connected together as the negative input end of the vibration table coil control circuit; one end of the switch tube TR1 is connected to the positive input end of the vibration table coil control circuit, the other end of the switch tube TR1 is used to connect one end of the vibration table coil, one end of the switch tube TR2 is used to connect the other end of the vibration table coil, and the other end of the switch tube TR2 is connected to the negative input end of the vibration table coil control circuit;

[0037] The switch tube TR1 and the switch tube TR2 are configured such that: when the vibration table coil works in the pull-in state, the switch tube TR1 and the switch tube TR2 are both closed; when the vibration table coil works in the cut-off state, the switch tube TR1 and the switch tube TR2 are both disconnected;

[0038] Among them: the vibration table coil control circuit also includes an input voltage detection circuit, which is used to connect the L line and the N line, rectify the voltage input from the L line and the N line into a pulsating DC voltage, and output a first voltage signal, so that the vibration table operates in an energized state when the first voltage signal is less than or equal to a first set value.

[0039] An input voltage detection circuit is added to the above-mentioned vibration table coil control circuit. By detecting the size of the pulsating DC voltage obtained by rectification, the vibration table is controlled to work in the attracted state when the first voltage signal is less than or equal to the first set value, thereby ensuring that the charging capacity of the AC power to the capacitor C1 remains unchanged during the attraction process, ensuring that the voltage change trend of the positive input end of the vibration table coil control circuit remains unchanged in each switching stage, and then ensuring that the coil working peak current remains basically unchanged, so that the vibration table can work stably within the set range, that is, adding an input voltage detection circuit can start the vibration table system when the AC power is input at a fixed phase at the beginning of each working cycle. After the vibration table system is started, it works with the input AC power voltage, thereby reducing the capacitance of the capacitor C1, and can effectively reduce the ripple current of the capacitor C1, thereby increasing the life of the capacitor.

[0040] Preferably, please continue to see Figure 2 The input voltage detection circuit includes a rectifier bridge D1A, a resistor R2 and a resistor R3. The first input end of the rectifier bridge D1A is used to connect the L line, the second input end of the rectifier bridge D1A is used to connect the N line, the positive output end of the rectifier bridge D1A is connected to one end of the resistor R2, the other end of the resistor R2 and one end of the resistor R3 are connected together to output a first voltage signal, and the negative output end of the rectifier bridge D1A is connected to the other end of the second resistor R3.

[0041] Furthermore, the vibration table coil control circuit also includes a coil current detection circuit, the coil current is connected to the loop where the vibration table coil is located, and is used to detect the current size in the vibration table coil, and output a second voltage signal, so that the vibration table works in the off state when the second voltage signal is greater than or equal to the second set value. The purpose of setting the current detection circuit is to make the vibration table work near the set coil working current through peak current control. Since the control IC of TR1 and TR2 has a 0.5s anti-false trigger time, this requires us to ensure that the voltage size of the positive input terminal of the vibration table coil control circuit remains unchanged or the change in each cycle is basically the same when the second signal reaches the set value. Since dI=U*dt / L, when the voltage size of the positive input terminal of the vibration table coil control circuit remains unchanged or the change trend is the same, it can ensure that the rising slope of the coil working current remains unchanged or the change trend is the same, and then it can better ensure that the coil working peak current remains unchanged, and solve the problem of working peak current fluctuation when the vibration table needs to be quickly switched on and off in the electromagnetic control device.

[0042] Preferably, the coil current detection circuit is a resistor or a current transformer, connected between the other end of the switch tube TR2 and the negative input end of the vibration table coil control circuit. Figure 2 , wherein a coil current detection circuit is provided, and the coil current detection circuit is a resistor R1.

[0043] Furthermore, the vibration table coil control circuit also includes a diode D1 and a diode D2, the anode of the diode D1 is connected to the other end of the switch tube TR1, the cathode of the diode D1 is connected to one end of the switch tube TR1, the anode of the diode D2 is connected to the other end of the switch tube TR2, and the cathode of the diode D2 is connected to the other end of the switch tube TR1. This improvement means is the same as that described in the background technology. Figure 1 The means are consistent, and the purpose is that when the vibration table coil is working in the shutdown stage, both switch tubes are disconnected, and the circuit returns the coil energy to the power grid through the path formed by the two diodes. The vibration table coil current is reduced to zero, so that the vibration table main contacts are quickly disconnected, which is beneficial to improving the reliability of the vibration table, and at the same time realizing energy recovery, which is beneficial to reducing the active power consumption of the vibration table.

[0044] Preferably, both the switch tube TR1 and the switch tube TR2 are MOS tubes.

[0045] Second embodiment

[0046] The present embodiment provides a vibration table, including an electromagnet and a coil, wherein: the vibration table also includes any vibration table coil control circuit of the first embodiment, which is used to control the coil to be attracted and cut off.

[0047] Preferably, the closing and opening of the switch tube K1 and the switch tube K2 are configured by the control IC and the single chip microcomputer.

[0048] Preferably, the control IC is SCM1503ASA.

[0049] The control IC SCM1503ASA is a control IC independently developed by the applicant of this application and has been put on the market. The functions and connection relationships of each pin of the IC are as follows:

[0050] Pin 1: quickly turns off the switch signal, connects to the control terminal P1 of the switch tube TR1, and controls the on and off of TR1;

[0051] Pin 2: chip power supply pin;

[0052] Pin 3: Power tube drive pin, connected to the control terminal P2 of the switch tube TR2, controls the on and off of TR2. After the pulse signal VT output by the matching single-chip microcomputer disappears, if VCC is undervoltage, the drive pin will continue to work for 0.5s;

[0053] Pin 4: working mode switching pin;

[0054] Pin 5: Holding state current setting pin;

[0055] Pin 6: Chip reference current setting pin;

[0056] Pin 7: Input enable signal detection, the input is the pulse signal VT output by the matching single-chip microcomputer. The pulse signal will be converted inside the control IC SCM1503ASA and then output the drive signal at pin 3 to drive the switch tube TR2 to close and open;

[0057] Pin 8: Current setting pin for the pull-in state, connected Figure 2 A second voltage signal is input to the connection point between the other end of the middle switch tube TR2 and one end of the resistor R1. The second voltage signal will interfere with the output of pin 3, so that the switch tube TR2 is disconnected when the second voltage signal is greater than or equal to the second set value.

[0058] Pin 9: Chip ground.

[0059] The above-mentioned single-chip microcomputer can adopt existing products on the market, such as model: GD32E230C8T6. The software therein has been copyright registered. The software name is: vibration table control software, the development completion date is: 2023-09-27, and the registration serial number is: 2023R11L2395553.

[0060] Figure 3 for Figure 2 A wiring diagram of a control chip and a single-chip microcomputer used in the circuit, wherein U1 is the control IC SCM1503ASA independently developed by the applicant of the present application, and U2 is the single-chip microcomputer available on the market, see Figure 3, wherein U2 has the following functions and connection relationships related to understanding the present utility model:

[0061] Pin 3: Connection Figure 2 A first voltage signal is input to a connection point between the other end of the middle resistor R2 and one end of the resistor R3;

[0062] Pin 4: Input pulse signal VT, this pin is connected to pin 7 of U1; this pulse signal can achieve: when the vibration table coil works in the pull-in state, the switch tube TR1 and the switch tube TR2 are both closed, and when the vibration table coil works in the cut-off state, the switch tube TR1 and the switch tube TR2 are both disconnected; this pulse signal can also achieve: when the first voltage signal is less than or equal to the first set value, the vibration table works in the pull-in state;

[0063] Pin 7: Ground pin;

[0064] Pin 8: Power supply pin.

[0065] The above are only preferred embodiments of the present invention, and those skilled in the art may also make changes and modifications to the above specific embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A vibration table coil control circuit, comprising a rectifier bridge D1, a capacitor C1, a switch tube TR1 and a switch tube TR2, wherein an L line connection port is connected to a first input end of the rectifier bridge D1, a positive output end of the rectifier bridge D1 and one end of the capacitor C1 are connected together to form a positive input end of the vibration table coil control circuit, an N line connection port is connected to a second input end of the rectifier bridge D1, a negative output end of the rectifier bridge D1 and the other end of the capacitor C1 are connected together to form a negative input end of the vibration table coil control circuit; one end of the switch tube TR1 is connected to a positive input end of the vibration table coil control circuit, and the other end of the switch tube TR1 is used to connect one end of the vibration table coil, one end of the switch tube TR2 is used to connect the other end of the vibration table coil, and the other end of the switch tube TR2 is connected to a negative input end of the vibration table coil control circuit; The switch tube TR1 and the switch tube TR2 are configured such that: when the vibration table coil is working in the pull-in state, the switch tube TR1 and the switch tube TR2 are both closed; when the vibration table coil is working in the shut-off state, the switch tube TR1 and the switch tube TR2 are both disconnected; Features: The vibration table coil control circuit also includes an input voltage detection circuit, which is used to connect the L line and the N line, rectify the voltage input to the L line and the N line into a pulsating DC voltage, detect the size of the pulsating DC voltage, and output a first voltage signal, so that the vibration table operates in an attracted state when the first voltage signal is less than or equal to a first set value.

2. The vibration table coil control circuit according to claim 1, characterized in that: The input voltage detection circuit includes a rectifier bridge D1A, a resistor R2 and a resistor R3, the first input end of the rectifier bridge D1A is used to connect the L line, the second input end of the rectifier bridge D1A is used to connect the N line, the positive output end of the rectifier bridge D1A is connected to one end of the resistor R2, the other end of the resistor R2 and one end of the resistor R3 are connected together to output the first voltage signal, and the negative output end of the rectifier bridge D1A is connected to the other end of the resistor R3.

3. The vibration table coil control circuit according to any one of claims 1 to 2, characterized in that: The vibration table coil control circuit also includes a coil current detection circuit, the coil current is connected to the loop where the vibration table coil is located, and is used to detect the current size in the vibration table coil and output a second voltage signal, so that the vibration table operates in an off state when the second voltage signal is greater than or equal to a second set value.

4. The vibration table coil control circuit according to claim 3, characterized in that: The coil current detection circuit is a resistor or a current transformer, which is connected between the other end of the switch tube TR2 and the negative input end of the vibration table coil control circuit.

5. The vibration table coil control circuit according to claim 1, characterized in that: The vibration table coil control circuit also includes a diode D1 and a diode D2, wherein the anode of the diode D1 is connected to the other end of the switch tube TR1, the cathode of the diode D1 is connected to one end of the switch tube TR1, the anode of the diode D2 is connected to the other end of the switch tube TR2, and the cathode of the diode D2 is connected to the other end of the switch tube TR1.

6. The vibration table coil control circuit according to claim 1, characterized in that: The switch tube TR1 and the switch tube TR2 are both MOS tubes.

7. A vibration table, comprising an electromagnet and a coil, characterized in that: The vibration table further comprises the vibration table coil control circuit according to any one of claims 1 to 6, which is used to control the coil to be attracted and disconnected.

8. The vibration table according to claim 7, characterized in that: The switch tubes K1 and K2 are turned on and off by the control IC and the single chip microcomputer.

9. The vibration table according to claim 8, characterized in that: The control IC is SCM1503ASA.

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