A high-voltage heavy-frequency bidirectional charge-discharge control circuit

Abstract

The utility model relates to a kind of high-voltage heavy frequency bidirectional charge-discharge control circuit, comprising: heavy frequency power supply circuit and discharge circuit;Heavy frequency power supply circuit includes: power supply, LC series resonance circuit, thyristor full-bridge circuit and capacitor;The inductance and capacitor in LC series resonance circuit are converted to the output voltage of power supply by resonance principle after boosting, and high voltage is obtained, the two ends of high voltage are connected with the input end of thyristor full-bridge circuit;The output end of thyristor full-bridge circuit is connected with the two ends of capacitor, and the working state of each thyristor in thyristor full-bridge circuit is controlled to charge capacitor in forward or reverse direction;The stored electric energy of capacitor is released to external load magnet in pulse form by discharge circuit;Solve the problems, such as high-voltage power supply in prior art under heavy frequency condition starting impact is big, bidirectional charge-discharge control precision is low, high-frequency repeated discharge stability is poor, especially suitable for the scene needing high-frequency bidirectional pulse energy output.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, specifically to a high-voltage repetitive frequency bidirectional charging and discharging control circuit. Background Technology

[0002] In some specialized electronic devices or systems, such as pulse magnet devices, the downstream magnet load needs to receive high-frequency, stable pulse voltage excitation. This requires the power supply to achieve efficient energy conversion from low voltage to high voltage, while also possessing bidirectional charging and discharging capabilities and high-frequency repetitive discharge characteristics.

[0003] Existing high-voltage power supplies are prone to generating large inrush currents during startup, affecting the lifespan of circuit components. Furthermore, they suffer from deficiencies in high-voltage conversion efficiency, charge / discharge direction control accuracy, and high-frequency repetitive discharge stability, making it difficult to meet the requirements of the downstream magnet for 30Hz pulse discharge. Therefore, there is an urgent need for a control device and method capable of achieving smooth startup, precise bidirectional charge / discharge, and stable high-frequency repetitive discharge to improve the overall performance of high-voltage repetitive-frequency power supplies. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing a high-voltage repetition frequency bidirectional charging and discharging control circuit.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A high-voltage repetition frequency bidirectional charge and discharge control circuit includes: a repetition frequency power supply circuit and a discharge circuit; the repetition frequency power supply circuit includes: a power supply, an LC series resonant circuit, a thyristor full-bridge circuit and a capacitor; The inductor and capacitor in the LC series resonant circuit boost the output voltage of the power supply to obtain a high voltage through the resonance principle. The two ends of the high voltage are connected to the input terminal of the thyristor full-bridge circuit. The output terminal of the thyristor full-bridge circuit is connected to the two ends of the capacitor. The capacitor is charged in the forward or reverse direction by controlling the working state of each thyristor in the thyristor full-bridge circuit. The capacitor releases the stored electrical energy to the external load magnet in the form of pulses through the discharge circuit.

[0006] The beneficial effects of this utility model are: it solves the problems of large starting impact, low bidirectional charging and discharging control accuracy, and poor stability of high-frequency repetitive discharge in the existing technology of high-voltage power supply under repeated frequency conditions, and is especially suitable for scenarios that require high-frequency bidirectional pulse energy output.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the repetition frequency power supply circuit also includes a soft-start circuit; the soft-start circuit includes a switch S1, a switch S3, and a resistor R1; The switch S3 is connected in series with the resistor R1 and then in parallel with the resistor R1. One end of the switch S1 is also connected to the positive terminal of the power supply, and the other end is connected to one end of the inductor L. The other end of the inductor L is connected to one input terminal of the LC series resonant circuit. The other input terminal of the LC series resonant circuit is connected to the negative terminal of the power supply.

[0009] Furthermore, the power source is a lithium battery with an output voltage range of 600~650V. Furthermore, the LC series resonant circuit includes: a full-bridge circuit with switching transistors, an inductor Lr, a capacitor Cr, a high-frequency transformer Tr, and a full-bridge circuit with diodes; The full-bridge circuit is composed of four switching transistors. One output terminal of the full-bridge circuit is connected to one end of the inductor Lr, and the other output terminal is connected to one end of the capacitor Cr. The other ends of the inductor Lr and the capacitor Cr are respectively connected to the two ports of the input terminal of the high-frequency transformer Tr. The diode full-bridge circuit is a full-bridge circuit composed of four diodes. The two ports of the output terminal of the high-frequency transformer Tr are connected to the input terminal of the diode full-bridge circuit, and the output terminal of the diode full-bridge circuit is connected to the input terminal of the thyristor full-bridge circuit.

[0010] Furthermore, the thyristor full-bridge circuit includes: thyristor Thy1, thyristor Thy2, thyristor Thy3 and thyristor Thy4; The negative terminal of thyristor Thy1 is connected to the positive terminal of thyristor Thy2, and the negative terminal of thyristor Thy3 is connected to the positive terminal of thyristor Thy4; the positive terminals of thyristors Thy1 and Thy3 are connected to each other, and the negative terminals of thyristors Thy2 and Thy4 are connected to each other. The connection points of thyristors Thy1 and Thy3, and the connection points of thyristors Thy2 and Thy4 serve as the two input ports of the thyristor full-bridge circuit. The connection points of thyristors Thy1 and Thy2, and the connection points of thyristors Thy3 and Thy4 serve as the two output ports of the thyristor full-bridge circuit and are connected to the two ends of the capacitor.

[0011] Furthermore, when thyristor Thy1 and thyristor Thy4 are turned on and thyristor Thy2 and thyristor Thy3 are turned off, the capacitor is forward charged; When thyristor Thy2 and thyristor Thy3 are turned on and thyristor Thy1 and thyristor Thy4 are turned off, the capacitor is reverse-charged.

[0012] Furthermore, the discharge circuit includes: thyristor Thy5, thyristor Thy6, thyristor Thy7 and thyristor Thy8; The negative terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy6, and the positive terminal of thyristor Thy7 is connected to the positive terminal of thyristor Thy8; the positive terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy7, and the positive terminal of thyristor Thy6 is connected to the negative terminal of thyristor Thy8 and grounded. The connection points of thyristors Thy5 and Thy7, and the connection points of thyristors Thy6 and Thy8, serve as the two input ports of the discharge circuit and are respectively connected to the two ends of the capacitor. The connection points of thyristors Thy5 and Thy6, and the connection points of thyristors Thy7 and Thy8, serve as the two output ports of the discharge circuit.

[0013] Furthermore, when thyristor Thy5 and thyristor Thy7 are turned on and thyristor Thy6 and thyristor Thy8 are turned off, the positive voltage stored in the capacitor is released to the load magnet in the form of pulses; When thyristors Thy6 and Thy8 are turned on and thyristors Thy5 and Thy7 are turned off, the reverse voltage stored in the capacitor is released to the load magnet in the form of pulses.

[0014] The beneficial effects of adopting the above-mentioned further solutions are: setting up a soft-start circuit to achieve smooth start-up, with the input voltage gradually rising from a lower value to the rated voltage; reducing impact and extending equipment life. The LC series resonant circuit, through PFM modulation and a closed-loop controller design, achieves a constant current output, offering advantages such as simple control, mature technology, and high reliability. In the LC series resonant circuit, the inductor and capacitor interact through resonance to achieve voltage boosting, exhibiting high efficiency and low electromagnetic interference, effectively boosting the input voltage at a specific resonant frequency. During capacitor charging, the bidirectional charging design achieved through thyristor bridge switching not only meets the specific requirements of certain electronic devices or systems for capacitor charging and discharging directions but also provides stable high-voltage power support for subsequent loads, ensuring the functionality and reliability of the entire energy conversion and transmission link. During the discharge of the load magnet, the thyristor-based bridge structure design precisely controls the timing and direction of discharge, providing a stable and reliable path for the capacitor to release pulsed energy to the subsequent magnet. Following the cyclic process of "discharge - reverse charging - re-discharge", the subsequent magnet is repeatedly pulsed and discharged at a frequency of 30Hz. This high-frequency repetitive discharge mode relies on the charging system's ability to quickly and accurately repair the capacitor voltage, and also benefits from the efficient switching performance of the thyristor bridge structure in the discharge circuit. This ensures that the energy of each discharge is stable while meeting the high-frequency pulse excitation requirements of the subsequent magnet. Attached Figure Description

[0015] Figure 1 A schematic diagram of a high-voltage repetitive frequency bidirectional charge and discharge control circuit provided by this utility model; Figure 2 A circuit topology diagram of an embodiment of a high-repetition-rate power supply circuit provided by this utility model; Figure 3 A circuit topology diagram for charging a capacitor is provided for an embodiment of this utility model; Figure 4 The diagram shown is a circuit topology diagram for forward charging of a capacitor according to an embodiment of this utility model; Figure 5 The diagram shown is a circuit topology diagram for reverse charging of a capacitor according to an embodiment of this utility model; Figure 6 A circuit topology diagram for discharging a load magnet is provided for an embodiment of this utility model; Figure 7 A circuit topology diagram for forward discharge of a load magnet is provided for an embodiment of this utility model; Figure 8 This invention provides a circuit topology diagram for reverse discharge of a load magnet, which is provided as an embodiment of the present invention. Detailed Implementation

[0016] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0017] like Figure 1 The diagram shown is a schematic block diagram of a high-voltage, high-repetition-frequency bidirectional charge-discharge control circuit provided by this utility model. Figure 1 It can be seen that the high-voltage repetition frequency bidirectional charge and discharge control circuit consists of a repetition frequency power supply circuit and a discharge circuit. The repetition frequency power supply circuit includes: a power supply, an LC series resonant circuit, a thyristor full-bridge circuit, and a capacitor; In an LC series resonant circuit, the inductor and capacitor boost the output voltage of the power supply to obtain a high voltage through the resonance principle. The two ends of the high voltage are connected to the input of the thyristor full-bridge circuit. The output of the thyristor full-bridge circuit is connected to the two ends of the capacitor. By controlling the working state of each thyristor in the thyristor full-bridge circuit, the capacitor is charged in the forward or reverse direction.

[0018] The capacitor releases its stored electrical energy to the external load magnet in the form of pulses through a discharge circuit.

[0019] Example 1 Embodiment 1 of this utility model is an embodiment of a high-voltage repetition frequency bidirectional charge and discharge control circuit provided by this utility model, such as... Figure 4 The diagram shown is a structural block diagram of an embodiment of the modular hardware circuit design for a high-voltage repetitive frequency bidirectional charge and discharge control circuit provided by this utility model. It includes: a repetitive frequency power supply circuit and a discharge circuit; the repetitive frequency power supply circuit provides a repetitive frequency power supply and includes: a power supply, a soft-start circuit, an LC series resonant circuit, a thyristor full-bridge circuit, and a capacitor.

[0020] The high-frequency power supply uses a lithium battery for power. Through the coordinated operation of the soft-start circuit, the LC series resonant circuit and the discharge circuit, it achieves constant current charging of the capacitor. The capacitor can pulse discharge to the downstream magnetic load at a frequency of 30Hz, providing stable and reliable energy conversion and control support for the entire system.

[0021] In one possible embodiment, the power source is a lithium battery with an output voltage range of 600~650V.

[0022] like Figure 2 The diagram shown is a circuit topology diagram of an embodiment of a high-repetition-rate power supply circuit provided by this utility model. Figure 2 It can be seen that after the lithium battery is input with a voltage of 600~650V, it is first processed by the soft start circuit, and then the voltage is boosted by the LC series resonant circuit, which finally realizes the bidirectional charging of capacitor C1. Subsequently, the capacitor continuously outputs pulse discharge to the subsequent magnetic load at a frequency of 30Hz with the help of the discharge circuit.

[0023] In one possible embodiment, the soft-start circuit includes: switch S1, switch S3, and resistor R1.

[0024] Switch S3 is connected in series with resistor R1 and then in parallel with resistor R1. One end of switch S1 is also connected to the positive terminal of the power supply, and the other end is connected to one end of inductor L. The other end of inductor L is connected to one input terminal of the LC series resonant circuit. The other input terminal of the LC series resonant circuit is connected to the negative terminal of the power supply.

[0025] The inductor L is a power transmission element between the soft-start circuit and the LC series resonant circuit. Its function is to filter, smooth the current, and suppress current ripple.

[0026] In practice, a switch S2 is connected between the negative terminal of the power supply and the other input terminal of the LC series resonant circuit. A diode D5 is also connected between the other input terminal of the LC series resonant circuit and the other end of the switch S1.

[0027] Soft-start circuits enable smooth startup by gradually increasing the power supply voltage from a lower value to the rated voltage, reducing impact and extending equipment life; the filter inductor L and filter capacitor achieve voltage or current filtering.

[0028] In an LC series resonant circuit, the inductor and capacitor boost the output voltage of the power supply to obtain a high voltage through the resonance principle. The two ends of the high voltage are connected to the input of the thyristor full-bridge circuit. The output of the thyristor full-bridge circuit is connected to the two ends of the capacitor. By controlling the working state of each thyristor in the thyristor full-bridge circuit, the capacitor is charged in the forward or reverse direction. In one possible embodiment, the LC series resonant circuit includes: a full-bridge circuit with switching transistors, an inductor Lr, a capacitor Cr, a high-frequency transformer Tr, and a full-bridge circuit with diodes. The full-bridge circuit with switching transistors consists of four switching transistors. One output terminal of the full-bridge circuit with switching transistors is connected to one end of the inductor Lr, and the other output terminal is connected to one end of the capacitor Cr. The other ends of the inductor Lr and the capacitor Cr are respectively connected to the two ports of the input terminal of the high-frequency transformer Tr. The diode full-bridge circuit is a full-bridge circuit composed of four diodes. The two output terminals of the high-frequency transformer Tr are connected to the input terminals of the diode full-bridge circuit, and the output terminal of the diode full-bridge circuit is connected to the input terminal of the thyristor full-bridge circuit.

[0029] The full-bridge circuit with switching transistors inverts the input DC power into high-frequency AC power, which is then stepped up to high-frequency high-voltage AC power by a high-frequency transformer. Finally, the full-bridge rectifier circuit converts the high-voltage AC power into high-voltage DC power for use by the downstream load.

[0030] This LC series resonant circuit employs PFM modulation and a closed-loop controller to achieve a constant current output. It boasts advantages such as simple control, mature technology, and high reliability. Using closed-loop control, the charging voltage, once set, can meet the module's charging requirements.

[0031] In one possible embodiment, the thyristor full-bridge circuit includes: thyristor Thy1, thyristor Thy2, thyristor Thy3 and thyristor Thy4; The negative terminal of thyristor Thy1 is connected to the positive terminal of thyristor Thy2, and the negative terminal of thyristor Thy3 is connected to the positive terminal of thyristor Thy4; the positive terminals of thyristors Thy1 and Thy3 are connected to each other, and the negative terminals of thyristors Thy2 and Thy4 are connected to each other. The connection points of thyristors Thy1 and Thy3, and the connection points of thyristors Thy2 and Thy4 serve as the two input ports of the thyristor full-bridge circuit. The connection points of thyristors Thy1 and Thy2, and the connection points of thyristors Thy3 and Thy4 serve as the two output ports of the thyristor full-bridge circuit and are connected to the two ends of the capacitor.

[0032] like Figure 3 The diagram shown is a circuit topology for charging a capacitor according to an embodiment of this utility model. Figure 4 and Figure 5 The figures shown are circuit topologies for forward and reverse charging of capacitors according to embodiments of this utility model.

[0033] Combination Figures 2-5 It is known that when the lithium battery outputs a voltage of 600 to 650V, the voltage will first enter the soft start circuit for preprocessing to avoid generating an excessive inrush current when the voltage is first connected, thereby protecting the subsequent circuit components from damage caused by instantaneous high voltage and high current, and ensuring the smoothness of the entire system startup process.

[0034] The voltage processed by the soft-start circuit is then sent to the LC series resonant circuit. In the LC series resonant circuit, the inductor and capacitor interact through the resonance principle to achieve voltage boosting, which features high efficiency and low electromagnetic interference, and can effectively boost the input voltage at a specific resonant frequency.

[0035] To enable bidirectional charging of the capacitor, a full-bridge circuit composed of thyristors is connected after the LC series resonant circuit.

[0036] In one possible embodiment, as shown in FIG4, when thyristors Thy1 and Thy4 are turned on and thyristors Thy2 and Thy3 are turned off, the capacitor is forward charged. As shown in Figure 5, when thyristors Thy2 and Thy3 are turned on and thyristors Thy1 and Thy4 are turned off, the capacitor is reverse-charged.

[0037] This bidirectional charging design, achieved through thyristor bridge switching, can not only meet the specific requirements of certain electronic devices or systems for the direction of capacitor charging and discharging, but also provide stable high-voltage power support for subsequent loads, ensuring the functionality and reliability of the entire energy conversion and transmission link.

[0038] From the perspective of the whole process, this is a complete energy conversion and transmission link from low-voltage input to high-voltage bidirectional output, which together ensures the safety and efficiency of voltage conversion and the accuracy of final charging.

[0039] The capacitor stores electrical energy and connects it to an external magnetic load through a discharge circuit. This controls the operating state of each thyristor in the full-bridge thyristor circuit, allowing the electrical energy stored in the capacitor to be released to the external load magnet in the form of pulses.

[0040] In one possible embodiment, the discharge circuit includes: thyristors Thy5, Thy6, Thy7, and Thy8; The negative terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy6, and the positive terminal of thyristor Thy7 is connected to the positive terminal of thyristor Thy8; the positive terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy7, and the positive terminal of thyristor Thy6 is connected to the negative terminal of thyristor Thy8 and grounded. The connection points of thyristors Thy5 and Thy7, and the connection points of thyristors Thy6 and Thy8, serve as the two input ports of the discharge circuit, which are respectively connected to the two ends of the capacitor. The connection points of thyristors Thy5 and Thy6, and the connection points of thyristors Thy7 and Thy8, serve as the two output ports of the discharge circuit.

[0041] like Figure 6 The diagram shown is a circuit topology diagram for discharging a load magnet according to an embodiment of this utility model. Figure 7 and Figure 8 The figures shown are circuit topologies for forward and reverse discharge of a load magnet, according to embodiments of this utility model.

[0042] After the charging system completes the charging process of the capacitor, the capacitor releases the stored electrical energy to the subsequent magnet in the form of pulses through the discharge circuit, thereby realizing pulse discharge to the subsequent magnet. The structure of the discharge circuit is similar to that of the bridge circuit in the charging stage, and it also uses a bridge circuit composed of thyristors, as shown in Figure 6.

[0043] During the discharge phase, the circuit's operating state is precisely controlled by the thyristor conduction combinations. In one possible embodiment, such as... Figure 7 As shown, when thyristors Thy5 and Thy7 are turned on and thyristors Thy6 and Thy8 are turned off, the positive voltage stored in the capacitor will be released to the load magnet in the form of pulses along this conduction circuit.

[0044] like Figure 8 As shown, when thyristors Thy6 and Thy8 are turned on and thyristors Thy5 and Thy7 are turned off, the reverse voltage stored in the capacitor will be released to the load magnet in the form of pulses along this conduction circuit.

[0045] The thyristor-based bridge structure design can precisely control the timing and direction of discharge, providing a stable and reliable path for the capacitor to release pulsed electrical energy to the subsequent magnet.

[0046] After the capacitor releases pulsed electrical energy to the subsequent magnet, a residual reverse voltage remains in the capacitor during the discharge process. At this point, the charging system immediately initiates a reverse charging procedure for the capacitor. The core objective of this supplementary charging operation is to precisely restore the capacitor voltage to a preset value, ensuring that the capacitor can provide the required energy during the next discharge. Once the capacitor has completed its reverse supplementary charging and reached the set voltage, it will again release pulsed electrical energy to the subsequent magnet through the discharge circuit.

[0047] This cycle repeats continuously, with the entire system following the "discharge-reverse charging-re-discharge" process described above, achieving repetitive pulse discharge to the subsequent magnet at a frequency of 30Hz. This high-frequency repetitive discharge mode relies on the charging system's ability to quickly and accurately repair the capacitor voltage, and also benefits from the efficient switching performance of the thyristor bridge structure in the discharge circuit. It can meet the high-frequency pulse excitation requirements of the subsequent magnet while ensuring stable discharge energy each time.

[0048] This utility model provides a high-voltage, high-repetition-frequency bidirectional charging and discharging control circuit. It incorporates a soft-start circuit for smooth startup, allowing the input voltage to gradually rise from a lower value to the rated voltage, reducing impact and extending equipment lifespan. The LC series resonant circuit, using PFM modulation and a closed-loop controller, achieves a constant current output, offering advantages such as simple control, mature technology, and high reliability. In the LC series resonant circuit, the inductor and capacitor interact through resonance to achieve voltage boosting, exhibiting high efficiency and low electromagnetic interference, effectively boosting the input voltage at a specific resonant frequency. During capacitor charging, the bidirectional charging design, achieved through thyristor bridge switching, meets the specific requirements of certain electronic devices or systems for capacitor charging and discharging direction, while also providing stable high-voltage power support for subsequent loads, ensuring the functionality and reliability of the entire energy conversion and transmission link. During load magnet discharging, the thyristor-based bridge structure design precisely controls the timing and direction of discharge, providing a stable and reliable path for the capacitor to release pulsed energy to the subsequent magnet. Following the cyclic process of "discharge - reverse charging - re-discharge", the subsequent magnet is repeatedly pulsed and discharged at a frequency of 30Hz. This high-frequency repetitive discharge mode relies on the charging system's ability to quickly and accurately repair the capacitor voltage, and also benefits from the efficient switching performance of the thyristor bridge structure in the discharge circuit. This ensures that the energy of each discharge is stable while meeting the high-frequency pulse excitation requirements of the subsequent magnet.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0050] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0051] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0052] When used here, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “including / contains” or “having” specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-voltage, high-repetition-frequency bidirectional charge-discharge control circuit, characterized in that, The bidirectional charge and discharge control circuit includes: a repetition frequency power supply circuit and a discharge circuit; the repetition frequency power supply circuit includes: a power supply, an LC series resonant circuit, a thyristor full-bridge circuit and a capacitor; The inductor and capacitor in the LC series resonant circuit boost the output voltage of the power supply to obtain a high voltage through the resonance principle. The two ends of the high voltage are connected to the input terminal of the thyristor full-bridge circuit. The output terminal of the thyristor full-bridge circuit is connected to the two ends of the capacitor. The capacitor is charged in the forward or reverse direction by controlling the working state of each thyristor in the thyristor full-bridge circuit. The capacitor releases the stored electrical energy to the external load magnet in the form of pulses through the discharge circuit.

2. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, The repetition frequency power supply circuit further includes a soft-start circuit; the soft-start circuit includes a switch S1, a switch S3, and a resistor R1. The switch S3 is connected in series with the resistor R1 and then in parallel with the resistor R1. One end of the switch S1 is also connected to the positive terminal of the power supply, and the other end is connected to one end of the inductor L. The other end of the inductor L is connected to one input terminal of the LC series resonant circuit. The other input terminal of the LC series resonant circuit is connected to the negative terminal of the power supply.

3. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, The power source is a lithium battery with an output voltage range of 600~650V.

4. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, The LC series resonant circuit includes: a full-bridge circuit with switching transistors, an inductor Lr, a capacitor Cr, a high-frequency transformer Tr, and a full-bridge circuit with diodes. The full-bridge circuit is composed of four switching transistors. One output terminal of the full-bridge circuit is connected to one end of the inductor Lr, and the other output terminal is connected to one end of the capacitor Cr. The other ends of the inductor Lr and the capacitor Cr are respectively connected to the two ports of the input terminal of the high-frequency transformer Tr. The diode full-bridge circuit is a full-bridge circuit composed of four diodes. The two ports of the output terminal of the high-frequency transformer Tr are connected to the input terminal of the diode full-bridge circuit, and the output terminal of the diode full-bridge circuit is connected to the input terminal of the thyristor full-bridge circuit.

5. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, The thyristor full-bridge circuit includes: thyristor Thy1, thyristor Thy2, thyristor Thy3 and thyristor Thy4; The negative terminal of thyristor Thy1 is connected to the positive terminal of thyristor Thy2, and the negative terminal of thyristor Thy3 is connected to the positive terminal of thyristor Thy4; the positive terminals of thyristors Thy1 and Thy3 are connected to each other, and the negative terminals of thyristors Thy2 and Thy4 are connected to each other. The connection points of thyristors Thy1 and Thy3, and the connection points of thyristors Thy2 and Thy4 serve as the two input ports of the thyristor full-bridge circuit. The connection points of thyristors Thy1 and Thy2, and the connection points of thyristors Thy3 and Thy4 serve as the two output ports of the thyristor full-bridge circuit and are connected to the two ends of the capacitor.

6. The bidirectional charge / discharge control circuit according to claim 5, characterized in that, When thyristor Thy1 and thyristor Thy4 are turned on and thyristor Thy2 and thyristor Thy3 are turned off, the capacitor is forward charged. When thyristor Thy2 and thyristor Thy3 are turned on and thyristor Thy1 and thyristor Thy4 are turned off, the capacitor is reverse-charged.

7. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, The discharge circuit includes: thyristor Thy5, thyristor Thy6, thyristor Thy7 and thyristor Thy8; The negative terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy6, and the positive terminal of thyristor Thy7 is connected to the positive terminal of thyristor Thy8; the positive terminal of thyristor Thy5 is connected to the negative terminal of thyristor Thy7, and the positive terminal of thyristor Thy6 is connected to the negative terminal of thyristor Thy8 and grounded. The connection points of thyristors Thy5 and Thy7, and the connection points of thyristors Thy6 and Thy8, serve as the two input ports of the discharge circuit and are respectively connected to the two ends of the capacitor. The connection points of thyristors Thy5 and Thy6, and the connection points of thyristors Thy7 and Thy8, serve as the two output ports of the discharge circuit.

8. The bidirectional charge / discharge control circuit according to claim 7, characterized in that, When thyristor Thy5 and thyristor Thy7 are turned on and thyristor Thy6 and thyristor Thy8 are turned off, the positive voltage stored in the capacitor is released to the load magnet in the form of pulses; When thyristors Thy6 and Thy8 are turned on and thyristors Thy5 and Thy7 are turned off, the reverse voltage stored in the capacitor is released to the load magnet in the form of pulses.

9. The bidirectional charge / discharge control circuit according to claim 1, characterized in that, After the capacitor releases pulsed electrical energy to the load magnet, it initiates reverse charging of the capacitor.

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