Electromagnetic coil driving circuit

Abstract

The invention belongs to the technical field of driving circuits, and discloses an electromagnetic coil driving circuit which comprises a waveform driving circuit, an adjustable follow-up power supply circuit and a coil. The waveform driving circuit is connected with the adjustable follow-up power supply circuit; the waveform driving circuit is used for amplifying the amplitude of the input current and converting an input sinusoidal signal into a sinusoidal waveform; the adjustable follow-up power supply circuit is used for adjustably controlling the voltage input into the waveform driving circuit according to a control signal; the coil is connected with the waveform driving circuit; and the coil is used for outputting the sinusoidal waveform. A fixed power supply of the current type coil driving circuit is changed into the follow-up power supply, and the power supply is provided by the adjustable follow-up power supply, so that the power consumption is reduced, the heat dissipation burden of equipment is relieved, the performance and the service life of elements are improved, the stability of the whole equipment circuit is improved, the current can be adjusted as required, the coil current is increased, and the service life of the coil is prolonged. The magnetic field intensity is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of drive circuits, and in particular to an electromagnetic coil drive circuit. Background Art

[0002] In current current-type coil driving circuits, a fixed power supply is usually used to provide the required power. However, this approach has many obvious shortcomings.

[0003] First, the fixed power supply makes the collector-emitter voltage of the driver tube change from +24V to -24V as a cosine curve, and the current changes as a sine curve. This complex change characteristic causes the driver tube to generate large power consumption during operation. On the one hand, a large amount of power consumption means energy waste, which reduces the energy utilization efficiency of the entire drive circuit; on the other hand, high power consumption causes the driver tube to heat up seriously, which not only increases the heat dissipation burden of the equipment, but also may reduce the performance and life of the driver tube due to overheating. Secondly, the coil will also overheat under this driving mode. The increase in equipment temperature poses a great threat to the stability of the entire equipment circuit. Excessive temperature may cause the performance of components in the circuit to degrade, parameter drift, and even cause failures. In addition, due to the limitations of power consumption and heating, the coil current is difficult to increase, which further limits the increase in magnetic field strength. In some application scenarios that require a strong magnetic field, the existing drive circuit cannot meet the requirements. With the continuous development of science and technology, the demand for magnetic field strength is increasing. The limitations of this fixed power supply driving method are becoming more and more prominent, and it is urgent to improve and innovate. Summary of the invention

[0004] The main purpose of the present invention is to provide an electromagnetic coil drive circuit, aiming to solve the technical problems that the existing current type coil drive circuit uses a fixed power supply to provide the required power, resulting in excessive power consumption of the entire circuit, excessive heat dissipation burden and reduced component performance.

[0005] In order to achieve the above-mentioned invention object, the present invention provides an electromagnetic coil driving circuit, including a waveform driving circuit, an adjustable follower power supply circuit, and a coil;

[0006] The waveform driving circuit is connected to the adjustable follower power supply circuit;

[0007] The waveform driving circuit is used to amplify the amplitude of the input current and convert the input sinusoidal signal into a sinusoidal waveform;

[0008] The adjustable follower power supply circuit is used to adjust the voltage of the input waveform driving circuit according to the control signal;

[0009] The coil is connected to the waveform driving circuit;

[0010] The coil is used to output the sinusoidal waveform.

[0011] Further, the adjustable follower power supply circuit includes a first switch driver, a first voltage stabilizing circuit, a first on-off circuit and a power output circuit;

[0012] The first end of the first switch driver is connected to the positive power supply start control signal end through a first resistor, the second end of the first switch driver is connected to the first end of the first voltage stabilizing circuit, the second end of the first voltage stabilizing circuit is connected to the first end of the first on-off circuit, and the second end of the first on-off circuit is connected to the power output circuit.

[0013] Furthermore, the first voltage stabilizing circuit includes a first current limiting steering circuit and a second current limiting steering circuit, and the first current limiting steering circuit and the second current limiting steering circuit are connected to each other in parallel.

[0014] Furthermore, the first on-off circuit is at least two interconnected PNP transistors.

[0015] Furthermore, the adjustable follower power supply circuit also includes a second switch driver, a second voltage stabilizing circuit, and a second on-off circuit;

[0016] The first end of the second switch driver is connected to the negative power supply start control signal end through the fourth resistor, the second end of the second switch driver is connected to the first end of the second voltage stabilizing circuit, the second end of the second voltage stabilizing circuit is connected to the first end of the second on-off circuit, and the second end of the second on-off circuit is connected to the power output circuit.

[0017] Furthermore, the second voltage stabilizing circuit includes a third current limiting steering circuit and a fourth current limiting steering circuit, and the third current limiting steering circuit and the fourth current limiting steering circuit are connected to each other in parallel.

[0018] Furthermore, the second on-off circuit is at least two NPN transistors connected to each other.

[0019] Furthermore, the power output circuit includes a voltage-stabilizing power supply circuit and a filtering and voltage-stabilizing capacitor circuit, and the voltage-stabilizing power supply circuit and the filtering and voltage-stabilizing capacitor circuit are connected in parallel between the first on-off circuit and the second on-off circuit.

[0020] Further, the waveform driving circuit includes a current switching driving circuit and an operational amplifier;

[0021] The first end of the current switching drive circuit is connected to the adjustable follower power supply circuit, the second end of the current switching drive circuit is connected to the first end of the operational amplifier, and the second end of the operational amplifier is connected to an end of the preset component outputting a sinusoidal signal.

[0022] Furthermore, the waveform driving circuit also includes a waveform driving auxiliary circuit, and the waveform driving auxiliary circuit is connected between the second end of the current switching driving circuit and the coil.

[0023] Beneficial effects:

[0024] An electromagnetic coil driving circuit of the present invention comprises a waveform driving circuit, an adjustable follower power supply circuit, and a coil; the waveform driving circuit is connected to the adjustable follower power supply circuit; the waveform driving circuit is used to amplify the amplitude of the input current and convert the input sinusoidal signal into a sinusoidal waveform; the adjustable follower power supply circuit is used to adjust the voltage input to the waveform driving circuit according to a control signal; the coil is connected to the waveform driving circuit; the coil is used to output the sinusoidal waveform, therefore, by changing the fixed power supply of the current type coil driving circuit to a follower power supply, the power supply of which is provided by the adjustable follower power supply, so that the follower The power supply can adjust the output voltage according to actual needs and only provide sufficient electrical energy to excite the load when necessary. Once the load is excited, the required electrical energy can be reduced, thereby reducing energy waste. Due to the reduction in power consumption, the heating problem of the drive tube and the coil will be alleviated, which can reduce the heat dissipation burden of the equipment and improve the performance and life of the components. At the same time, the reduction in equipment temperature helps to improve the stability of the entire equipment circuit and reduce the performance degradation and parameter drift of circuit components caused by excessive temperature. In addition, the follow-up power supply can adjust the current as needed so that the coil current can be increased, thereby enhancing the magnetic field strength to meet the application scenarios that require a strong magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of an electromagnetic coil driving circuit according to an embodiment of the present invention;

[0026] Figure 2 It is an overall schematic diagram of an adjustable follow-up power supply circuit according to an embodiment of the present invention;

[0027] Figure 3 It is an overall schematic diagram of a first voltage stabilizing circuit according to an embodiment of the present invention;

[0028] Figure 4 It is an overall schematic diagram of a second voltage stabilizing circuit according to an embodiment of the present invention;

[0029] Figure 5 FIG. 1 is an overall schematic diagram of a power output circuit according to an embodiment of the present invention.

[0030] in:

[0031] 1. Waveform drive circuit; 2. Adjustable follow-up power supply circuit; 3. Coil;

[0032] 10. Current switching drive circuit; 11. Waveform drive auxiliary circuit;

[0033] U2, first switch driver; 20, first voltage stabilizing circuit; 21, first on-off circuit; 22, power output circuit; R5, first resistor;

[0034] 201, a first current limiting steering circuit; 202, a second current limiting steering circuit;

[0035] 220, voltage-stabilizing power supply circuit; 221, filtering and voltage-stabilizing capacitor circuit;

[0036] R4, second resistor; D1, first diode; R6, third resistor; D2, second diode;

[0037] Q4, first driving tube; Q3, second driving tube;

[0038] U3, second switch driver; 23, second voltage stabilizing circuit; 24, second on-off circuit; R7, fourth resistor;

[0039] 230. A third current limiting steering circuit; 231. A fourth current limiting steering circuit;

[0040] R8, fifth resistor; D5, third diode; R9, sixth resistor; D6, fourth diode;

[0041] Q5, the third driving tube; Q6, the fourth driving tube;

[0042] 25, battery; D3, first voltage regulator; L2, first inductor; C2, first capacitor; D4, second voltage regulator; L3, second inductor; C3, second capacitor;

[0043] Q1, the fifth driving tube; Q2, the sixth driving tube; U1, the operational amplifier; R1, the seventh resistor; R2, the eighth resistor; C1, the third capacitor.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] Reference Figure 1 , this embodiment provides an electromagnetic coil driving circuit, including a waveform driving circuit 1, an adjustable follower power supply circuit 2, and a coil 3;

[0050] The waveform driving circuit 1 is connected to the adjustable follower power supply circuit 2;

[0051] The waveform driving circuit 1 is used to amplify the amplitude of the input current and convert the input sinusoidal signal into a sinusoidal waveform;

[0052] The adjustable follower power supply circuit 2 is used to adjust the voltage of the waveform driving circuit 1 according to the control signal;

[0053] The coil 3 is connected to the waveform driving circuit 1;

[0054] The coil 3 is used to output the sinusoidal waveform.

[0055] In the above embodiment, the electromagnetic coil driving circuit includes a waveform driving circuit 1, an adjustable follower power supply circuit 2, and a coil 3, wherein the circuit includes positive power supply and negative power supply related parts, the positive power supply part is connected to related circuit elements by a positive power supply start control signal terminal (VP_ON), ​​for example, when the positive power supply needs to be started, the VP_ON signal is valid, and this signal will trigger a series of subsequent circuit actions; the negative power supply part is similar, and there is a negative power supply start control signal terminal (VN_ON) connected to related circuit elements, when VN_ON is valid, the negative power supply related circuit starts to work, and these circuit elements adjust the output voltage according to the control signal through reasonable wiring and connection methods;

[0056] The waveform driving circuit 1 is connected to the adjustable follower power supply circuit 2 and receives the output voltage thereof. It has a processing circuit inside to operate the input current. After receiving the voltage from the adjustable follower power supply circuit 2 and the input sinusoidal signal, it realizes the current amplitude expansion and the conversion of the sinusoidal signal to a sinusoidal waveform through a series of operational amplifiers, transistors and other components. The operational amplifier can amplify and shape the signal, and the transistor can be used as a current control device to control the on-off and size of the current according to the change of the input signal. For example, when the input sinusoidal signal is in the positive half cycle, the relevant transistor is turned on, and the current flows from the positive power supply through the transistor to the coil 3. At the same time, under the action of the operational amplifier, the current amplitude is expanded. When the input signal is in the negative half cycle, other transistors are turned on, and the current flows from the negative power supply to the coil 3, which also realizes the amplitude expansion and waveform conversion.

[0057] The coil 3 is connected to the waveform drive circuit 1. As the final load, the coil 3 receives the sinusoidal waveform current output by the waveform drive circuit 1 and generates a corresponding magnetic field around it. Since the waveform drive circuit 1 performs amplitude amplification and waveform conversion on the input current, the current passing through the coil 3 is a sinusoidal waveform current that meets the requirements and can generate a stable and effective magnetic field. Therefore, by changing the fixed power supply of the current type coil 3 drive circuit to a follow-up power supply, the power supply is provided by an adjustable follow-up power supply, so that the follow-up power supply can adjust the output voltage according to actual needs, and only provide sufficient electric energy to excite the load when necessary. Once the load is excited, the required electric energy can be reduced, thereby reducing energy waste, and due to the reduction in power consumption, the heating problem of the drive tube and the coil 3 will be alleviated, which can reduce the heat dissipation burden of the equipment and improve the performance and life of the components. At the same time, the reduction in equipment temperature helps to improve the stability of the entire equipment circuit and reduce the problem of circuit component performance degradation and parameter drift caused by excessive temperature. In addition, the follow-up power supply can adjust the current as needed, so that the current of the coil 3 can be increased, thereby enhancing the magnetic field strength and meeting the application scenario requiring a strong magnetic field.

[0058] Reference Figure 1-Figure 2 In one embodiment, the adjustable follower power supply circuit 2 includes a first switch driver U2, a first voltage stabilizing circuit 20, a first on-off circuit 21 and a power output circuit 22;

[0059] The first end of the first switch driver U2 is connected to the positive power on control signal end (VP_ON) through the first resistor R5, the second end of the first switch driver U2 is connected to the first end of the first voltage stabilizing circuit 20, the second end of the first voltage stabilizing circuit 20 is connected to the first end of the first on-off circuit 21, and the second end of the first on-off circuit 21 is connected to the power output circuit 22.

[0060] In the above embodiment, the adjustable follow-up power supply circuit 2 includes a first switch driver U2, a first voltage stabilizing circuit 20, a first on-off circuit 21 and a power output circuit 22, wherein the first end of the first switch driver U2 includes a first leg, a second leg and a third leg, and the second end of the first switch driver U2 includes a fourth leg, a fifth leg and a sixth leg; the first leg of the first end of the first switch driver U2 is connected to the positive power on control signal terminal (VP_ON) through the first resistor R5, which is the trigger signal path for starting the entire positive power supply circuit. When VP_ON has a suitable signal, the current will flow to the first leg of the first switch driver U2 through the first resistor R5; the second leg of the first switch driver U2 is not connected, and the third leg of the first switch driver U2 is connected The grounded third leg provides a stable reference potential for the entire circuit, ensuring that the potential of each point in the circuit has a relative reference, which is crucial for the normal operation and signal processing of the circuit; the fourth leg of the first switch driver U2 is grounded, the fifth leg of the first switch driver U2 is connected to the first end of the first voltage stabilizing circuit 20, and the sixth leg of the first switch driver U2 has a +24V voltage input. The connection of the fifth leg of the first switch driver U2 enables the first switch driver U2 to pass the internally processed signal to the first voltage stabilizing circuit 20 for further voltage stabilization processing, and the +24V voltage input of the sixth leg of the first switch driver U2 provides the necessary working power supply for the internal circuit of the first switch driver U2, so that it can operate normally and process signals.

[0061] The first end of the first voltage stabilizing circuit 20 is connected to the fifth leg of the first switch driver U2, and receives the signal from the first switch driver U2. The second end of the first voltage stabilizing circuit 20 is connected to the first end of the first on-off circuit 21, and transmits the signal after voltage stabilization to the first on-off circuit 21, so as to further control the on-off of the current. The first end of the first on-off circuit 21 is connected to the second end of the first voltage stabilizing circuit 20, and receives the signal after voltage stabilization. The second end of the first on-off circuit 21 is connected to the power output circuit 22, and controls whether the current flows out of the power output circuit 22 according to the received signal, so as to realize the control of the power output. The power output circuit 22 receives the current from the second end of the first on-off circuit 21 (when the first on-off circuit 21 is turned on), processes the input current and outputs a suitable voltage to provide power for subsequent circuits (such as the waveform driving circuit 1, etc.).

[0062] When the VP_ON signal meets the requirements, the first switch driver U2 starts the internal circuit and performs preliminary processing on the signal, and then passes the processed signal to the subsequent voltage stabilization circuit. At the same time, the grounding and power input pins (+24V of the sixth pin) inside the first switch driver U2 ensure its own stable operation, so that it can work normally and process signals under appropriate conditions. Since the positive power on control signal terminal (VP_ON) may provide a large current, if it is directly connected to the first switch driver U2, the first switch driver U2 may be damaged. The first resistor R5 protects U2 from being impacted by excessive current by limiting the current, ensuring that U2 can receive and process signals normally, improving the reliability of the circuit, and ensuring that the circuit can work stably and reliably during long-term operation.

[0063] Therefore, the first switch driver U2 receives the positive power on control signal through the first resistor R5 to realize the circuit start trigger, and processes the signal internally and transmits it to the subsequent circuit. At the same time, its own grounding and power input pins ensure stable operation. The first voltage stabilizing circuit 20 stabilizes the signal, and through the coordinated work of various components, it limits the current, stabilizes the voltage and controls the current direction to provide a suitable voltage for the subsequent circuit. The first on-off circuit 21 accurately controls the on-off of the current according to the stabilized signal, and cooperates with other components to provide a stable current path for the power output circuit 22 to meet the power demand under different working conditions and improve the reliability and controllability of the circuit. The power output circuit 22 processes the input current and outputs a suitable voltage to provide a stable power supply for the subsequent circuit and ensure the normal operation of the entire circuit.

[0064] Reference Figure 1-Figure 3 In one embodiment, the first voltage stabilizing circuit 20 includes a first current limiting steering circuit 201 and a second current limiting steering circuit 202, and the first current limiting steering circuit 201 and the second current limiting steering circuit 202 are connected in parallel to each other.

[0065] In the above embodiment, the first current limiting steering circuit 201 includes a second resistor R4 and a first diode D1, and the second current limiting steering circuit 202 includes a third resistor R6 and a second diode D2; the first end of the second resistor R4 is connected to the second end of the first switch driver U2, the second end of the second resistor R4 is connected to the first end of the first diode D1, the second end of the first diode D1 is connected to the first end of the first on-off circuit 21, the first end of the third resistor R6 is connected to the connection line between the first end of the second resistor R4 and the second end of the first switch driver U2, the second end of the third resistor R6 is connected to the first end of the second diode D2, and the second end of the second diode D2 is connected to the connection line between the second end of the first diode D1 and the first end of the first on-off circuit 21.

[0066] The first end of the second resistor R4 is closely connected to the second end of the first switch driver U2, and is the entrance of the entire voltage stabilizing circuit to receive the signal from the driver. The second end of the second resistor R4 is connected to the first end of the first diode D1, so as to transmit the current and voltage signal passing through itself to the first diode D1; the first end of the first diode D1 receives the signal from the second resistor R4, and the second end of the first diode D1 is connected to the first end of the first on-off circuit 21, so that the first diode D1 is in a key position in the circuit, and it can further process the signal passing through the second resistor R4 and guide it to the first on-off circuit 21; the first end of the third resistor R6 is connected to the first end of the first diode D1. The first end of the second resistor R4 is connected to the second end of the first switch driver U2 in a connection line, so that the third resistor R6 can work together with the second resistor R4 on the input signal, and the second end of the third resistor R6 is connected to the first end of the second diode D2, and transmits the signal processed by itself to the second diode D2; the first end of the second diode D2 receives the signal from the third resistor R6, and its second end is connected to the connection line between the second end of the first diode D1 and the first end of the first on-off circuit 21, so that the second diode D2 works with the first diode D1 to comprehensively process the signal in the circuit before transmitting it to the first on-off circuit 21.

[0067] The signal output from the first switch driver U2 may have a large current and voltage. The second resistor R4 limits the current flowing into the subsequent circuit through its own resistance characteristics to prevent excessive current from damaging subsequent components. The first diode D1 uses its unidirectional conductivity to play a key guiding and protective role in the circuit. It only allows current to flow from its anode to the cathode, thereby ensuring the unidirectional flow characteristics of the current in the circuit. Similar to the second resistor R4, the third resistor R6 also has a voltage dividing function. It and the second resistor R4 together form a voltage dividing network to finely adjust the input voltage. By reasonably selecting the resistance value of the third resistor R6, it can work with the second resistor R4 to stabilize the input voltage within a suitable range. The second diode D2 also has unidirectional conductivity. Its main function is to prevent the current from flowing in the reverse direction. In the circuit, it cooperates with the first diode D1 to further strengthen the circuit's control over the current direction. When a reverse voltage appears in the circuit, the second diode D2 can effectively prevent the generation of reverse current and protect the normal operation of the circuit, thereby providing a stable power supply for the subsequent circuit and improving the overall performance and reliability of the circuit.

[0068] Therefore, in terms of current limiting, the second resistor R4 and the third resistor R6 respectively limit the current in their respective current limiting guide circuits to prevent excessive current from damaging subsequent components; in terms of voltage division, the third resistor R6 works together with the second resistor R4 to finely adjust the input voltage and stabilize the voltage within an appropriate range; in terms of current control, the first diode D1 and the second diode D2 use unidirectional conductivity to ensure unidirectional current flow and strengthen current direction control. When a reverse voltage appears, the reverse current can be blocked to provide a stable power supply for subsequent circuits and improve the overall performance and reliability of the circuit.

[0069] Reference Figure 1-Figure 2 In one embodiment, the first on-off circuit 21 is at least two interconnected PNP transistors.

[0070] In the above embodiment, the first on-off circuit 21 includes a first driving tube Q4 and a second driving tube Q3, the base of the first driving tube Q4 is connected to the connecting line between the second end of the second diode D2 and the second end of the first diode D1, the collector of the first driving tube Q4 is connected to the power output circuit 22, the emitter of the first driving tube Q4 is connected to the base of the second driving tube Q3, and the collector of the second driving tube Q3 is connected to the power output circuit 22.

[0071] The base of the first driving tube Q4 is connected to the connection line between the second end of the second diode D2 and the second end of the first diode D1, so that the first driving tube Q4 can obtain the signal processed by the second diode D2 and the first diode D1, thereby determining its own conduction state. The collector of the first driving tube Q4 is connected to the power output circuit 22. When it is turned on, the current can flow out from the collector of the first driving tube Q4, providing a current path for the power output circuit 22. The emitter of the first driving tube Q4 is connected to the base of the second driving tube Q3, and transmits its own state information to the second driving tube Q3 to coordinate control. The base of the second driving tube Q3 receives the signal from the emitter of the first driving tube Q4, and the collector of the second driving tube Q3 is also connected to the power output circuit 22. The second driving tube Q3 and the first driving tube Q4 jointly provide a current path for the power output circuit 22. The emitter of the second driving tube Q3 has a +24V voltage input, which provides a reference potential for the second driving tube Q3 and may also participate in the operation of the circuit in some cases. For example, when the second driving tube Q3 is in the cut-off state, the +24V voltage of the emitter of the second driving tube Q3 can play a certain isolation role.

[0072] The first drive tube Q4 determines whether to conduct according to the signal received by the base. When the base signal meets the conduction condition, it allows current to flow from the collector to the emitter, thereby providing a current path for the power output circuit 22. At the same time, it realizes the coordinated work with the second drive tube Q3 through the connection of the emitter to the second drive tube Q3, and jointly controls the on-off state of the circuit; the second drive tube Q3 also determines its own conduction state according to the signal received from the first drive tube Q4 at the base. When the first drive tube Q4 and the second drive tube Q3 are both on, the current can flow smoothly from the power output circuit 22. The +24V voltage input of the emitter of the second drive tube Q3 provides it with a special working condition, which can affect its conduction characteristics in some cases, and can play a certain isolation and protection role in the off state. This on-off circuit structure can accurately control the on-off of the current through the coordinated work of the two drive tubes, flexibly adjust the circuit state according to the input signal, provide a stable current path for the power output circuit 22, and improve the controllability and reliability of the circuit.

[0073] Therefore, the first drive tube Q4 and the second drive tube Q3 work together to jointly determine the on-off state of the circuit according to the signal received by the base. The base of the first drive tube Q4 obtains the signal processed by the diode to determine its own conduction, and transmits information to the second drive tube Q3 through the emitter to achieve precise control. When both drive tubes are turned on, a stable current path can be provided for the power output circuit 22 to ensure that the current can flow smoothly from the power output circuit to meet the subsequent circuit's demand for electrical energy. At the same time, the emitter of the second drive tube Q3 has a +24V voltage input, which can provide it with a reference potential, which affects the conduction characteristics in some cases, and can also play an isolation and protection role in the cut-off state, thereby improving the controllability and reliability of the circuit.

[0074] Reference Figure 1-Figure 4 In one embodiment, the adjustable follower power supply circuit 2 further includes a second switch driver U3, a second voltage stabilizing circuit 23, and a second on-off circuit 24;

[0075] The first end of the second switch driver U3 is connected to the negative power on control signal end (VN_ON) through the fourth resistor R7, the second end of the second switch driver U3 is connected to the first end of the second voltage stabilizing circuit 23, the second end of the second voltage stabilizing circuit 23 is connected to the first end of the second on-off circuit 24, and the second end of the second on-off circuit 24 is connected to the power output circuit 22.

[0076] In the above embodiment, the adjustable follower power supply circuit 2 also includes a second switch driver U3, a second voltage stabilizing circuit 23, and a second on-off circuit 24, wherein the first end of the second switch driver U3 includes a first leg, a second leg and a third leg, and the second end of the second switch driver U3 includes a fourth leg, a fifth leg and a sixth leg; the first end of the second switch driver U3 is connected to the negative power on control signal terminal (VN_ON) through a fourth resistor R7, wherein the first end of the fourth resistor R7 is connected to VN_ON, and the second end of the fourth resistor R7 is connected to the first leg of the second switch driver U3, so that when VN_ON has a signal, the current enters the second switch driver U3 through the fourth resistor R7, the second leg of the first end of the second switch driver U3 is not connected, and the third leg of the second switch driver U3 is grounded, Provide a reference potential for the circuit; the fourth leg of the second end of the second switch driver U3 has a -24V voltage input, providing a negative power supply for the internal circuit, the fifth leg of the second switch driver U3 is connected to the first end of the second voltage stabilizing circuit 23, and transmits the processed signal to the voltage stabilizing circuit, and the sixth leg of the second switch driver U3 is grounded; the first end of the second voltage stabilizing circuit 23 is connected to the fifth leg of the second switch driver U3, and receives the signal from the second switch driver U3, and its second end is connected to the first end of the second on-off circuit 24, and transmits the signal after voltage stabilization to the second on-off circuit 24, the first end of the second on-off circuit 24 is connected to the second end of the second voltage stabilizing circuit 23, and receives the stabilized signal, and its second end is connected to the power output circuit 22, and controls whether the current flows out of the power output circuit 22 according to the received signal.

[0077] The second switch driver U3 is the front-end control element of the negative power supply circuit, which responds to and processes the negative power supply start control signal terminal (VN_ON). When the VN_ON signal meets the requirements, the internal circuit is started and the signal is preliminarily processed, and then the signal is passed to the subsequent voltage stabilization circuit. At the same time, its internal grounding and negative power supply input pin (-24V of the fourth pin) ensure its own stable operation. The fourth resistor R7 prevents excessive current from VN_ON directly flowing into the second switch driver U3, protecting the second switch driver U3 from damage. This circuit design of the negative power supply part realizes stable negative power supply output through the coordination of various components. Current limiting, voltage stabilization and on-off control ensure the safety and stability of the circuit, and provide a suitable negative power supply for related circuits.

[0078] Therefore, the second switch driver U3 receives the negative power start signal through the fourth resistor R7, starts the internal circuit and preliminarily processes the signal to realize the trigger control of the negative power circuit, and the second voltage stabilizing circuit 23 stabilizes the signal. The various components work together to limit the current, stabilize the voltage and control the current direction to provide a suitable voltage for the subsequent circuit, and the second on-off circuit 24 accurately controls the current on and off according to the stabilized signal, and cooperates with other components to provide a stable current path for the power output circuit 22 to meet the power demand related to the negative power supply. At the same time, the circuit structure is similar to the positive power supply part and cooperates with each other to jointly realize the function of the adjustable follow-up power supply circuit, providing a stable positive and negative power supply for the entire electromagnetic coil drive circuit to ensure its normal operation.

[0079] Reference Figure 1-Figure 4 In one embodiment, the second voltage stabilizing circuit 23 includes a third current limiting steering circuit 230 and a fourth current limiting steering circuit 231, and the third current limiting steering circuit 230 and the fourth current limiting steering circuit 231 are connected in parallel to each other.

[0080] In the above embodiment, the third current limiting steering circuit 230 includes a fifth resistor R8 and a third diode D5, and the fourth current limiting steering circuit 231 includes a sixth resistor R9 and a fourth diode D6; the first end of the fifth resistor R8 is connected to the second end of the second switch driver U3, the second end of the fifth resistor R8 is connected to the first end of the third diode D5, the second end of the third diode D5 is connected to the first end of the second on-off circuit 24, the first end of the sixth resistor R9 is connected to the connection line between the first end of the fifth resistor R8 and the second end of the second switch driver U3, the second end of the sixth resistor R9 is connected to the first end of the fourth diode D6, and the second end of the fourth diode D6 is connected to the connection line between the second end of the third diode D5 and the first end of the second on-off circuit 24.

[0081] The second voltage stabilizing circuit 23 includes a fifth resistor R8, a third diode D5, a sixth resistor R9 and a fourth diode D6, wherein the first end of the fifth resistor R8 is connected to the second end of the second switch driver U3, and is the entrance for the voltage stabilizing circuit to receive the signal from the driver, and the second end is connected to the first end of the third diode D5, and transmits the signal passing through itself to the third diode D5; the first end of the third diode D5 receives the signal from the fifth resistor R8, and the second end is connected to the first end of the second on-off circuit 24, processes the signal and transmits it to the on-off circuit; the first end of the sixth resistor R9 is connected to the connection line between the fifth resistor R8 and the second switch driver U3, and acts on the input signal together with the fifth resistor R8, and the second end is connected to the first end of the fourth diode D6, and transmits the processed signal; the first end of the fourth diode D6 receives the signal from the sixth resistor R9, and the second end is connected to the connection line between the third diode D5 and the second on-off circuit 24, and transmits the signal to the on-off circuit after working in conjunction with the third diode D5.

[0082] The fifth resistor R8 plays the role of current limiting and voltage dividing, limiting the current flowing from the second switch driver U3, preventing excessive current from damaging subsequent components, and participating in voltage dividing to adjust the voltage value; the third diode D5 uses unidirectional conductivity to prevent the current from flowing in the opposite direction, ensuring the normal operation of the circuit, and assisting in voltage stability; the sixth resistor R9 is similar to the fifth resistor R8, and has a voltage dividing function, and finely adjusts the voltage together with the fifth resistor R8, and also limits the current to a certain extent; the fourth diode D6 also prevents reverse current, cooperates with the third diode D5 to strengthen the current direction control, and participates in the voltage stabilization process. This voltage stabilization circuit structure realizes effective voltage stabilization of the input voltage through the cooperation of various components, and the resistor voltage division and the unidirectional conductivity of the diode ensure the stability of the output voltage, providing a stable power supply for the subsequent circuit.

[0083] Therefore, the fifth resistor R8 and the sixth resistor R9 limit the current in their respective current limiting circuits to prevent excessive current from damaging subsequent components. The two work together to finely adjust the input voltage and stabilize the voltage within an appropriate range. The third diode D5 and the fourth diode D6 use unidirectional conductivity to ensure unidirectional current flow and strengthen current direction control. When there is a reverse voltage, the reverse current can be blocked to provide a stable power supply for subsequent circuits, improve the overall performance and reliability of the circuit, and ensure that the second on-off circuit 24 and the power output circuit 22 can obtain stable voltage input.

[0084] Reference Figure 1-Figure 2 In one embodiment, the second on-off circuit is at least two interconnected NPN transistors.

[0085] In the above embodiment, the second on-off circuit 24 includes a third driving tube Q5 and a fourth driving tube Q6, the base of the third driving tube Q5 is connected to the connecting line between the second end of the third diode D5 and the second end of the fourth diode D6, the collector of the third driving tube Q5 is connected to the power output circuit 22, the emitter of the third driving tube Q5 is connected to the base of the fourth driving tube Q6, and the collector of the fourth driving tube Q6 is connected to the power output circuit 22.

[0086] The second on-off circuit 24 includes a third drive tube Q5 and a fourth drive tube Q6. The base of the third drive tube Q5 is connected to the connection line between the second end of the third diode D5 and the second end of the fourth diode D6, which is the key part for receiving the control signal. The signal reaches the base of the third drive tube Q5 after being processed by the third drive tube Q5 and the fourth diode D6, and determines its conduction state. The collector of the third drive tube Q5 is connected to the power output circuit 22. When the third drive tube Q5 is turned on, it can provide a current path for the power output circuit 22. The emitter is connected to the base of the fourth drive tube Q6, and transmits its own conduction state information to the fourth drive tube Q6 to coordinate the on-off of the control circuit; the base of the fourth drive tube Q6 receives the signal from the emitter of the third drive tube Q5, and the collector is also connected to the power output circuit 22, and together with the third drive tube Q5, provides a current path for the power output circuit 22. The emitter has a -24V voltage input, and this voltage provides a reference potential for the fourth drive tube Q6, which may affect its conduction characteristics in some cases, and can also play a certain isolation role in the off state.

[0087] The third drive tube Q5 determines whether to conduct according to the signal received by the base. When the base signal meets the conduction condition, it allows current to flow from the collector to the emitter, thereby controlling the on and off of the circuit. Through the connection between the emitter and the fourth drive tube Q6, it realizes the coordinated work with the fourth drive tube Q6 and jointly determines the conduction state of the circuit; the fourth drive tube Q6 determines its own conduction state according to the signal received from the third drive tube Q5 at the base. When the third drive tube Q5 and the fourth drive tube Q6 are both on, the current can flow smoothly from the power output circuit 22. The -24V voltage input of the emitter provides it with special working conditions, which will affect its conduction characteristics in some cases, and can play an isolation and protection role in the cut-off state. This on-off circuit structure can accurately control the on and off of the current through the coordinated work of the two drive tubes, flexibly adjust the circuit state according to the input signal, provide a stable current path for the power output circuit 22, and improve the controllability and reliability of the circuit.

[0088] Therefore, the third drive tube Q5 and the fourth drive tube Q6 work together to jointly determine the on-off state of the circuit according to the signal received by the base. The base of the third drive tube Q5 obtains the signal processed by the diode to determine its own conduction, and transmits information to the fourth drive tube Q6 through the emitter to achieve precise control. When both drive tubes are turned on, a stable current path can be provided for the power output circuit 22 to ensure that the current can flow smoothly from the power output circuit to meet the subsequent circuit's demand for electrical energy, especially in the circuit part related to the negative power supply. The emitter of the fourth drive tube Q6 has a -24V voltage input, which can provide a reference potential for it, affecting the conduction characteristics in some cases. In the cut-off state, it can also play an isolation and protection role, thereby improving the controllability and reliability of the circuit in the negative power supply part.

[0089] Reference Figure 1-Figure 5 In one embodiment, the power output circuit 22 includes a voltage-stabilizing power supply circuit 220 and a filtering and stabilizing capacitor circuit 221, and the voltage-stabilizing power supply circuit 220 and the filtering and stabilizing capacitor circuit 221 are connected in parallel between the first on-off circuit 21 and the second on-off circuit 24.

[0090] In the above embodiment, the voltage-stabilized power supply circuit 220 includes a battery 25, a first voltage-stabilizing tube D3 and a second voltage-stabilizing tube D4, the filtering voltage-stabilizing capacitor circuit 221 includes a first capacitor C2 and a second capacitor C3, and the power output circuit 22 also includes a second inductor L3 and a first inductor L2; the negative terminal of the battery 25 is connected to the first end of the first voltage-stabilizing tube D3, the second end of the first voltage-stabilizing tube D3 is connected to the second end of the first on-off circuit 21, and the first end of the first inductor L2 is connected to the connection between the second end of the first voltage-stabilizing tube D3 and the second end of the first on-off circuit 21. On the wiring circuit, the second end of the first inductor L2 is connected to the first end of the first capacitor C2, and the second end of the first capacitor C2 is grounded; the positive terminal of the battery 25 is connected to the first end of the second voltage regulator tube D4, and the second end of the second voltage regulator tube D4 is connected to the second end of the second on-off circuit 24; the first end of the second inductor L3 is connected to the connection line between the second end of the second voltage regulator tube D4 and the second end of the second on-off circuit 24, the second end of the second inductor L3 is connected to the first end of the second capacitor C3, and the second end of the second capacitor C3 is grounded.

[0091] The voltage of the battery 25 includes but is not limited to 12V and 24V. The battery 25 serves as the energy source of the entire power output circuit 22. Its negative terminal is connected to the first end of the first voltage regulator tube D3, and its positive terminal is connected to the first end of the second voltage regulator tube D4; the second end of the first voltage regulator tube D3 is connected in series to the collector of the first drive tube Q4 and the collector of the second drive tube Q3. When the first drive tube Q4 and the second drive tube Q3 are turned on, the current flows from the negative electrode of the battery 25 through the first voltage regulator tube D3 to the collector of the first drive tube Q4 and the second drive tube Q3. The first end of the first inductor L2 is connected to the connection line between the second end of the first voltage regulator tube D3 and the collector of the first drive tube Q4. It receives the current flowing out of the first voltage regulator tube D3 and passes it to the first capacitor C2 connected to the second end. The second end of the first capacitor C2 is grounded to form a loop for storing and releasing electric energy, playing the role of filtering and stabilizing voltage; the second end of the second voltage regulator tube D4 is connected in series to the collector of the third drive tube Q5 and the collector of the fourth drive tube Q6. When the third driving tube Q5 and the fourth driving tube Q6 are turned on, the current flows from the positive electrode of the battery 25 to the collectors of the third driving tube Q5 and the fourth driving tube Q6 through the second voltage regulator tube D4. The first end of the second inductor L3 is connected to the connection line between the second end of the second voltage regulator tube D4 and the collector of the third driving tube Q5. It receives the current flowing out of the second voltage regulator tube D4 and transmits it to the second capacitor C3 connected to the second end. The second end of the second capacitor C3 is grounded, and a loop is also formed to store and release electric energy, playing the role of filtering and stabilizing voltage.

[0092] The battery 25 provides electrical energy, which is the basis for the normal operation of the entire circuit. It provides the required energy for subsequent components such as the voltage regulator, driver tube, inductor and capacitor; the first voltage regulator D3 and the second voltage regulator D4 mainly play the role of stabilizing the voltage. When the current or voltage in the circuit fluctuates, the voltage regulator can stabilize the voltage within a suitable range through its own characteristics to ensure that the voltage output to the subsequent circuit is relatively stable; the first inductor L2 and the second inductor L3, the inductor has the characteristic of hindering current changes. In the circuit, they can buffer the sudden change of current and make the current smoother. At the same time, they can also cooperate with capacitors to form a filter circuit to further improve the stability of the voltage; the first capacitor C2 and the second capacitor C3, the capacitors have the characteristics of storing and releasing electrical energy. In the circuit, they can filter the voltage fluctuations and filter out the high-frequency noise to make the output voltage smoother and more stable. At the same time, they cooperate with the inductor to form an LC filter circuit to improve the performance of the circuit. This power output circuit 22 can provide a stable voltage output through the synergistic effect of various components. The voltage regulator stabilizes the voltage, and the inductor and capacitor filter provide good power supply conditions for subsequent circuits and improve the stability and reliability of the circuit.

[0093] Therefore, the battery in the voltage-stabilizing power supply circuit 220 provides electrical energy, the first voltage-stabilizing tube D3 and the second voltage-stabilizing tube D4 stabilize the voltage, ensuring that a stable voltage is output to the subsequent circuit to meet the circuit's requirements for different voltages, the first capacitor C2 and the second capacitor C3 in the filtering and voltage-stabilizing capacitor circuit 221 filter voltage fluctuations, remove high-frequency noise, and make the voltage smoother and more stable, the inductor and the capacitor cooperate to form an LC filtering circuit, further improving the voltage stability and reducing the impact of current mutations on the circuit, the voltage-stabilizing power supply 220 and the filtering and voltage-stabilizing capacitor circuit 221 are connected in parallel, and together provide a stable power supply for the circuit between the first on-off circuit 21 and the second on-off circuit 24, ensuring that the entire electromagnetic coil drive circuit can work normally and improving the reliability and stability of the circuit.

[0094] Reference Figure 1-Figure 2 , in one embodiment, the waveform driving circuit 1 includes a current switching driving circuit 10 and an operational amplifier U1;

[0095] The first end of the current switching drive circuit 10 is connected to the adjustable follower power supply circuit 2, the second end of the current switching drive circuit 10 is connected to the first end of the operational amplifier U1, and the second end of the operational amplifier U1 is connected to an end of the preset component outputting a sinusoidal signal.

[0096] In the above embodiment, the current switching drive circuit 10 includes a fifth drive tube Q1 and a sixth drive tube Q2; the collector of the fifth drive tube Q1 is connected to the connection line between the second end of the first inductor L2 and the first end of the first capacitor C2, the base of the fifth drive tube Q1 is connected to the sixth leg of the operational amplifier, the emitter of the fifth drive tube Q1 is connected to the emitter of the sixth drive tube Q2, and the first end of the coil 3 is connected to the connection line between the emitter of the fifth drive tube Q1 and the emitter of the sixth drive tube Q2, the collector of the sixth drive tube Q2 is connected to the connection line between the second end of the second inductor L3 and the first end of the second capacitor C3, the base of the sixth drive tube Q2 is connected to the connection line between the base of the fifth drive tube Q1 and the sixth leg of the operational amplifier U1, the second leg of the operational amplifier U1 is grounded and connected to the second end of the coil 3, and the third leg of the operational amplifier U1 is connected to one end of the preset component outputting the sinusoidal signal.

[0097] The waveform driving circuit 1 includes a fifth driving tube Q1, a sixth driving tube Q2 and an operational amplifier U1. The collector of the fifth driving tube Q1 is connected to the connection line between the second end of the first inductor L2 and the first end of the first capacitor C2, and obtains processed electric energy from the power output circuit 22. The base of the fifth driving tube Q1 is connected to the sixth leg of the operational amplifier U1, and receives a control signal from the operational amplifier to determine its own conduction degree. The emitter is connected to the emitter of the sixth driving tube Q2, and the first end of the coil 3 is connected to this connection line. When the fifth driving tube Q1 is turned on, the current can flow from the collector to the emitter, and then to the coil 3; the collector of the sixth driving tube Q2 is connected to the connection line between the second end of the second inductor L3 and the first end of the second capacitor C3, and also obtains electric energy from the power output circuit 22. The base is connected to the connection line between the base of the fifth driving tube Q1 and the sixth leg of the operational amplifier U1. On the line, the control signal from the operational amplifier is shared with the fifth drive tube Q1, the emitter is connected to the fifth drive tube Q1 and connected to the first end of the coil 3. When the sixth drive tube Q2 is turned on, the current can flow from the collector to the emitter, and the direction of flowing to the coil 3 is opposite to that when the fifth drive tube Q1 is turned on; the second leg of the operational amplifier U1 is grounded and connected to the second end of the coil 3, providing a reference potential for signal processing, the third leg is connected to one end of the preset component outputting a sinusoidal signal, receiving the input sinusoidal signal for amplification and processing, the sixth leg is connected to the base of Q1 and Q2, and outputs a control signal to determine the conduction state of the fifth drive tube Q1 and the sixth drive tube Q2, the first leg and the fifth leg are connected to external devices, and may be used to input or output other related signals, the fourth leg has a -24V voltage input, the seventh leg has a +24V voltage input, and provides a working power supply for the operational amplifier, and the eighth leg is not connected.

[0098] The fifth drive tube Q1 and the sixth drive tube Q2, as current control elements, control the on-off and size of the current according to the control signal of the operational amplifier, thereby realizing the regulation of the current of the coil 3. They are alternately turned on and off, so that the current can switch between the positive and negative power supplies, and provide a sinusoidal current for the coil 3; the operational amplifier U1 amplifies and processes the input sinusoidal signal, and adjusts the amplitude of the input signal according to its internal circuit structure and characteristics to meet the requirements of the subsequent circuit. At the same time, by outputting a control signal to the base of the drive tube, the on and off time of the drive tube is accurately controlled, thereby realizing accurate control of the current of the coil 3 and ensuring that the output current waveform is a sine wave. This waveform drive circuit 1 can accurately convert the input sinusoidal signal into a sinusoidal waveform current suitable for the coil 3 through the synergistic effect of the operational amplifier and the drive tube, realize effective control of the current of the coil 3, and improve the performance and stability of the circuit.

[0099] Therefore, the fifth drive tube Q1 and the sixth drive tube Q2 in the current switching drive circuit 10 control the on-off and size of the current according to the control signal of the operational amplifier U1, so as to adjust the current of the coil 3. At the same time, they are alternately turned on and off, so that the current can be switched between the positive and negative power supplies, and a sinusoidal current is provided to the coil 3. For example, the collector of the fifth drive tube Q1 is connected to the connection line between the second end of the first inductor L2 and the first end of the first capacitor C2, which provides a specific path for the circulation of the current. The operational amplifier U1 amplifies and processes the input sinusoidal signal, adjusts the amplitude to meet the requirements of the subsequent circuit, and accurately controls the on and off time of the fifth drive tube Q1 and the sixth drive tube Q2 by outputting the control signal to the base of the drive tube, so as to ensure that the current waveform output to the coil 3 is a sinusoidal wave. The current switching drive circuit 10 and the operational amplifier U1 work together to accurately convert the input sinusoidal signal into a sinusoidal current suitable for the coil 3, effectively control the current of the coil 3, improve the circuit performance and stability, and meet the requirements of electromagnetic coil driving.

[0100] Reference Figure 1-Figure 2 In one embodiment, the waveform driving circuit 1 further includes a waveform driving auxiliary circuit 11 , and the waveform driving auxiliary circuit 11 is connected between the second end of the current switching driving circuit 10 and the coil 3 .

[0101] In the above embodiment, the waveform driving auxiliary circuit 11 includes an eighth resistor R2 and a third capacitor C1, and the waveform driving circuit 1 also includes a seventh resistor R1, a first end of the seventh resistor R1 is connected to the connection line between the base of the fifth driving tube Q1 and the base of the sixth driving tube Q2, a second end of the seventh resistor R1 is connected to the connection line between the emitter of the fifth driving tube Q1 and the emitter of the sixth driving tube Q2, a first end of the eighth resistor R2 is connected to the second end of the seventh resistor R1, the connection line between the emitter of the fifth driving tube Q1 and the emitter of the sixth driving tube Q2, and a first end of the coil 3 is connected to the first end of the eighth resistor R2, a second end of the eighth resistor R2 is connected to the first end of the third capacitor C1, a second end of the third capacitor C1 is connected to the connection line between the second leg of the operational amplifier U1 and the ground, and a second end of the coil 3 is connected to the second end of the third capacitor C1 and the ground connection line.

[0102] The waveform driving circuit 1 further includes a seventh resistor R1, an eighth resistor R2 and a third capacitor C1. The first end of the seventh resistor R1 is connected to the connection line between the base of the fifth driving tube Q1 and the base of the sixth driving tube Q2, so that it can affect the control signal of the base of the fifth driving tube Q1 and the sixth driving tube Q2. The second end of the seventh resistor R1 is connected to the connection line between the emitter of the fifth driving tube Q1 and the emitter of the sixth driving tube Q2, thereby establishing a connection between the input and output ends of the driving tubes. The first end of the eighth resistor R2 is connected to the second end of the seventh resistor R1, the emitter of the fifth driving tube Q1 and the emitter of the sixth driving tube Q2. The emitter connection line of the six-driver tube Q2, and the first end of the coil 3 is also connected here, so that the eighth resistor R2 is on the path of the current flowing from the driver tube to the coil 3, and its second end is connected to the first end of the third capacitor C1, and the current signal passing through itself is transmitted to the third capacitor C1; the first end of the third capacitor C1 receives the signal from the eighth resistor R2, and the second end is connected to the second leg of the operational amplifier U1 and the ground connection line, and the second end of the coil 3 is also connected here, forming a loop including the capacitor and the coil 3, and there is energy exchange and interaction between the third capacitor C1 and the coil 3.

[0103] The seventh resistor R1 is connected between the base and emitter of the driving tube. When the operational amplifier outputs a control signal to the base of the driving tube, the seventh resistor R1 will divide the signal to prevent excessive voltage from being directly applied to the driving tube to cause damage. At the same time, it also limits the size of the base current, so that the conduction and cutoff of the driving tube can be more stable and controllable; the eighth resistor R2 is on the path where the current flows from the driving tube to the coil 3. It limits the size of the current to prevent excessive current from flowing through the coil 3 and causing damage to the coil 3. In addition, it also forms a part of a filter circuit together with the third capacitor C1 to filter the high-frequency components in the current to make the current flowing through the coil 3 smoother; the third capacitor C1 is in the circuit, and it forms a filter circuit with the eighth resistor R2 to filter the high-frequency noise in the current, so that the voltage at both ends of the coil 3 is more stable and the influence of voltage fluctuations on the coil 3 is reduced. At the same time, the loop formed by it and the coil 3 will also affect the frequency characteristics of the circuit, which may affect the parameters such as the resonant frequency of the entire circuit. The synergistic effect of these components optimizes the waveform driving circuit 1 , the resistor plays a protective and current limiting role, the capacitor filtering makes the current smoother and the voltage more stable, thereby improving the circuit performance and stability and ensuring the normal operation of the coil 3 .

[0104] Therefore, the seventh resistor R1 divides the signal output by the operational amplifier U1 to the base of the driving tube to avoid excessive voltage being directly applied to the fifth driving tube Q1 and the sixth driving tube Q2 to cause damage, and at the same time limits the base current to make the conduction and cutoff of the driving tube more stable and controllable. For example, its first end is connected to the base connection line of the two driving tubes, and the second end is connected to the emitter connection line, which plays a key protective role. The eighth resistor R2 limits the current on the path where the current flows from the driving tube to the coil 3 to prevent excessive current from damaging the coil 3. The third capacitor C1 and the eighth resistor R2 form a filter circuit to filter the high-frequency components in the current, so that the current flowing through the coil 3 is smoother, the voltage at both ends of the coil 3 is more stable, the influence of voltage fluctuations on the coil 3 is reduced, and the reliability and stability of the circuit are improved.

[0105] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electromagnetic coil driving circuit, characterized in that: It includes a waveform driving circuit, an adjustable follow-up power supply circuit, and a coil; The waveform driving circuit is connected to the adjustable follower power supply circuit; The waveform driving circuit is used to amplify the amplitude of the input current and convert the input sinusoidal signal into a sinusoidal waveform; The adjustable follower power supply circuit is used to adjust the voltage of the input waveform driving circuit according to the control signal; The coil is connected to the waveform driving circuit; The coil is used to output the sinusoidal waveform.

2. The electromagnetic coil driving circuit according to claim 1, characterized in that: The adjustable follower power supply circuit includes a first switch driver, a first voltage stabilizing circuit, a first on-off circuit and a power output circuit; The first end of the first switch driver is connected to the positive power supply start control signal end through a first resistor, the second end of the first switch driver is connected to the first end of the first voltage stabilizing circuit, the second end of the first voltage stabilizing circuit is connected to the first end of the first on-off circuit, and the second end of the first on-off circuit is connected to the power output circuit.

3. The electromagnetic coil driving circuit according to claim 2, characterized in that: The first voltage stabilizing circuit includes a first current limiting steering circuit and a second current limiting steering circuit, and the first current limiting steering circuit and the second current limiting steering circuit are connected to each other in parallel.

4. The electromagnetic coil driving circuit according to claim 2, characterized in that: The first on-off circuit is at least two interconnected PNP transistors.

5. The electromagnetic coil driving circuit according to claim 2, characterized in that: The adjustable follower power supply circuit also includes a second switch driver, a second voltage stabilizing circuit, and a second on-off circuit; The first end of the second switch driver is connected to the negative power supply start control signal end through the fourth resistor, the second end of the second switch driver is connected to the first end of the second voltage stabilizing circuit, the second end of the second voltage stabilizing circuit is connected to the first end of the second on-off circuit, and the second end of the second on-off circuit is connected to the power output circuit.

6. The electromagnetic coil driving circuit according to claim 5, characterized in that: The second voltage stabilizing circuit includes a third current limiting steering circuit and a fourth current limiting steering circuit, and the third current limiting steering circuit and the fourth current limiting steering circuit are connected to each other in parallel.

7. The electromagnetic coil driving circuit according to claim 5, characterized in that: The second on-off circuit is at least two NPN transistors connected to each other.

8. The electromagnetic coil driving circuit according to claim 5, characterized in that: The power output circuit includes a voltage-stabilizing power supply circuit and a filtering voltage-stabilizing capacitor circuit, and the voltage-stabilizing power supply circuit and the filtering voltage-stabilizing capacitor circuit are connected in parallel between the first on-off circuit and the second on-off circuit.

9. The electromagnetic coil driving circuit according to claim 1, characterized in that: The waveform driving circuit includes a current switching driving circuit and an operational amplifier; The first end of the current switching drive circuit is connected to the adjustable follower power supply circuit, the second end of the current switching drive circuit is connected to the first end of the operational amplifier, and the second end of the operational amplifier is connected to an end of the preset component outputting a sinusoidal signal.

10. The electromagnetic coil driving circuit according to claim 9, characterized in that: The waveform driving circuit further includes a waveform driving auxiliary circuit, and the waveform driving auxiliary circuit is connected between the second end of the current switching driving circuit and the coil.

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