Magnetic amplifier control circuit and control method

Abstract

The present invention discloses a magnetic amplifier control circuit and control method, belonging to the field of magnetic amplifier control. The control circuit of the present invention includes a transformer secondary conversion circuit, a magnetic amplifier switching circuit, an output rectifier circuit, an output filter circuit, a current sampling circuit, a current feedback control circuit, a secondary filter circuit, a voltage sampling circuit, a voltage feedback control circuit, a voltage / current selection control circuit, and a magnetic amplifier drive circuit. The control method of the present invention achieves "zero" voltage drop loss, improving the efficiency of the switching power supply; reduces the voltage and current stress of the rectifier tube, improving the power supply output capacity; solves the problem of interactive voltage regulation between the main and auxiliary circuits; improves the output dynamic performance of the auxiliary secondary voltage regulator circuit; and improves the voltage regulation performance of the auxiliary secondary voltage regulator circuit.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic amplifier control, and in particular relates to a magnetic amplifier control circuit and a control method. Background Art

[0002] With the continuous increase in power supply output power, there is an urgent need to solve the problem of secondary voltage regulation of the power supply's secondary circuit. Currently, magnetic amplifier control circuits and control methods have been widely used in the secondary voltage regulation circuits of high-power switching power supplies. Traditional power supply secondary voltage regulation circuits mainly include: 1. Three-terminal voltage regulator voltage regulation, 2. DC-DC conversion voltage regulation, 3. Cross-connected inductor voltage regulation, and 4. Traditional magnetic amplifier control circuit and control method voltage regulation. The three-terminal voltage regulator method has disadvantages such as low output power and high power consumption, the DC-DC conversion voltage regulation method has disadvantages such as complex control circuits and high costs, and the cross-connected inductor voltage regulation method has disadvantages such as a narrow voltage regulation range and only applicable to specific loads. The traditional magnetic amplifier control circuit and control method voltage regulation method has solved the above-mentioned shortcomings of the first three methods to a certain extent, but still has shortcomings such as low output power and large switching losses. Therefore, it is necessary to study a new type of magnetic amplifier control circuit to fundamentally solve the above technical problems. Summary of the Invention

[0003] In view of the above technical problems existing in the prior art, the present invention proposes a magnetic amplifier control circuit and a control method, which are reasonably designed, overcome the shortcomings of the prior art, and have good effects.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A magnetic amplifier control circuit includes a transformer secondary conversion circuit, a magnetic amplifier switching circuit, an output rectifier circuit, an output filter circuit, a current sampling circuit, a current feedback control circuit, a secondary filter circuit, a voltage sampling circuit, a voltage feedback control circuit, a voltage / current selection control circuit, and a magnetic amplifier drive circuit;

[0006] The transformer secondary conversion circuit, the magnetic amplifier switching circuit, the output rectification circuit, the output filtering circuit, the current sampling circuit, the secondary filtering circuit, the voltage sampling circuit, the voltage feedback control circuit, the voltage / current selection control circuit, the magnetic amplifier driving circuit and the magnetic amplifier switching circuit are sequentially connected through circuits; the current sampling circuit, the current feedback control circuit and the voltage / current selection control circuit are sequentially connected through circuits;

[0007] a transformer secondary conversion circuit configured to provide a pulsed square wave voltage to a magnetic amplifier switching circuit;

[0008] a magnetic amplifier switching circuit configured to switch and chop the pulsed square wave voltage;

[0009] an output rectifier circuit configured to rectify the pulsed square wave voltage after the switch chopping;

[0010] an output filter circuit configured to filter the rectified pulse square wave voltage to generate a DC voltage;

[0011] a current sampling circuit configured to sample the load current of the DC voltage and convert the current signal into a corresponding voltage signal;

[0012] a secondary filtering circuit configured to perform secondary filtering on the DC output voltage to generate a pure DC output voltage;

[0013] A voltage sampling circuit is configured to sample the DC voltage and convert the output voltage into a voltage sampling signal suitable for processing by a voltage feedback control circuit;

[0014] a voltage feedback control circuit configured to amplify the amplitude and compensate the phase of an error signal between the voltage sampling signal and the voltage reference signal;

[0015] a current feedback control circuit configured to amplify the amplitude and perform phase compensation on the voltage signal generated by the current sampling circuit;

[0016] A voltage / current selection control circuit is configured to select voltage feedback and current feedback;

[0017] The magnetic amplifier driving circuit is configured to perform power amplification on the output signal of the voltage / current selection control circuit.

[0018] Preferably, the transformer secondary conversion circuit includes a secondary winding of a transformer T1, a resistor R1 and a capacitor C1; one end of the resistor R1 is connected to one end of the capacitor C1, the other end of the resistor R1 and the opposite-name end of the secondary winding of the transformer T1 form a common end connected to one end of the inductor L2, and the other end of the capacitor C1 and the same-name end of the secondary winding of the transformer T1 form a common end connected to one end of the inductor L1.

[0019] Preferably, the magnetic amplifier switching circuit includes inductors L1-L2, diodes V1-V2, and resistors R2-R3; the other end of the inductor L1 and the cathode of the diode V1 form a common end connected to an anode of the diode V3, the other end of the inductor L2 and the cathode of the diode V2 form a common end connected to the other anode of the diode V3, the anode of the diode V1 is connected to one end of the resistor R2, the anode of the diode V2 is connected to one end of the resistor R3, and the other ends of the resistors R2 and R3 form a common end connected to the collectors of the transistors V10 and V11.

[0020] Preferably, the output rectifier circuit includes diodes V3 and V4; the cathodes of the diodes V3 and V4 form a common terminal connected to one end of the inductor L3, and the anode of the diode V4 is grounded;

[0021] The output filter circuit includes an inductor L3, capacitors C2 and C3; the other end of the inductor L3, the positive electrode of the capacitor C2 and one end of the capacitor C3 form a common end, which is connected to the common end formed by the resistors R4, R5, R7 and one end of the capacitor C4, and the negative electrode of the capacitor C2 and the other end of the capacitor C3 form a common end and are grounded.

[0022] Preferably, the current sampling circuit includes resistors R4 and R5 and a capacitor C4; the other end of the resistors R4 and R5 and the capacitor C4 forms a common end connected to the resistor R9 and one end of the inductor L4;

[0023] A current feedback control circuit includes resistors R7-R12, capacitors C9-C10, a diode V5, and an integrated circuit N101A; the other end of resistor R7, one end of resistor R8, and one end of resistors R11-R12 form a common terminal connected to pin 2 of the integrated circuit N101A, the other end of resistor R8 is grounded, the other end of resistor R12 is connected to one end of capacitor C9, resistor R11, the other end of capacitor C9, and the cathode of diode V6 form a common terminal connected to pin 1 of the integrated circuit N101A; the other end of resistor R9 and the other end of resistor R10 form a common terminal connected to pin 3 of the integrated circuit N101A; the other end of resistor R10 is connected to the cathode of diode V5, and the anode of diode V5 is connected to the voltage reference Vr; pin 8 of the integrated circuit N101A and one end of capacitor C10 form a common terminal connected to the power supply Vcc, and pin 4 of the integrated circuit N101A is grounded.

[0024] Preferably, the secondary filtering circuit includes an inductor L4, a resistor R6 and capacitors C5-C8; the other end of the inductor L4, one end of the resistor R6, the positive electrode of the capacitor C5 and one end of the capacitors C6-C7 are connected to the output voltage Vo, the other end of the resistor R6, the negative electrode of the capacitor C5, the other end of the capacitor C6 and one end of the capacitor C8 are grounded, and the other ends of the capacitors C7 and C8 are connected to the mechanical ground, that is, the earth.

[0025] Preferably, the voltage sampling circuit includes resistors R14-R16 and a capacitor C11; one end of the resistor R14 and the capacitor C11 forms a common end connected to the output voltage Vo, the other end of the capacitor C11 is connected to one end of the resistor R16, the other ends of the resistors R14 and R16 and one end of the resistor R15 form a common end connected to pin 6 of the integrated circuit N101B, and the other end of the resistor R15 is grounded;

[0026] A voltage feedback control circuit includes resistors R17-R20, capacitors C12-C13, a diode V7, and an integrated circuit N101B; one end of resistors R17-R18, one end of capacitor C12, and the cathode of diode V7 form a common terminal connected to the voltage reference Vr, the other end of resistor R17 is connected to the power supply Vcc, the other end of resistor R18 is connected to pin 5 of the integrated circuit N101B, the other end of capacitor C12 and the anode of diode V7 form a common terminal connected to ground; the other end of resistor R20 is connected to one end of capacitor C9, and the other end of resistor R19, capacitor C13, and the cathode of diode V8 form a common terminal connected to pin 7 of N101B.

[0027] Preferably, the voltage / current selection control circuit includes resistors R13 and R21 and diodes V6 and V8; the anode of diode V6 is connected to one end of resistor R13, the anode of diode V8 is connected to one end of resistor R21, and the other ends of resistors R13 and R21 form a common end, which is connected to the base of transistor V10.

[0028] Preferably, the magnetic amplifier driving circuit includes resistors R22-R24, a diode V9 and transistors V10-V11; one end of the resistors R22-R24 and the cathode of the diode V9 constitute a common end, which is connected to the power supply Vcc; the other end of the resistor R22 and the anode of the diode V9 constitute a common end, which is connected to the base of the transistor V10; the other end of the resistor R23 is connected to the emitter of the transistor V10 and the base of the transistor V11, and the other end of the resistor R24 ​​is connected to the emitter of the transistor V11; the common end formed by the collectors of the transistors V10 and V11 is connected to the common end formed by the resistor R2 and the other end of the resistor R3.

[0029] In addition, the present invention also provides a magnetic amplifier control method, which uses the magnetic amplifier control circuit described above and specifically includes the following steps:

[0030] Step 1: The primary high-voltage pulse square wave voltage is converted into the low-voltage pulse square wave voltage required by the secondary through the transformer secondary conversion circuit;

[0031] Step 2: Through the magnetic amplifier switching circuit, the secondary low-voltage pulse square wave voltage is subjected to secondary switching chopping to achieve secondary voltage stabilization;

[0032] Step 3: The output rectifier circuit rectifies the pulse square wave voltage after the switch chopping, and freewheels the filter inductor current;

[0033] Step 4: Filter the rectified pulse square wave voltage through the output filter circuit to generate a DC voltage;

[0034] Step 5: Sample the load current of the DC voltage through the current sampling circuit and convert the current signal into a corresponding voltage signal;

[0035] Step 6: Through the current feedback control circuit, the voltage signal generated by the current sampling circuit is amplified and phase compensated to achieve effective control of the output current size and response speed;

[0036] Step 7: Perform secondary filtering on the DC output voltage through a secondary filtering circuit to generate a purer DC output voltage;

[0037] Step 8: The DC voltage is sampled by a voltage sampling circuit, and the output voltage is converted into a voltage sampling signal suitable for processing by a voltage feedback control circuit;

[0038] Step 9: Through the voltage feedback control circuit, the voltage signal generated by the voltage sampling circuit is amplified and phase compensated to achieve effective control of the output voltage amplitude and response speed;

[0039] Step 10: Select voltage feedback and current feedback through the voltage / current selection circuit;

[0040] Step 11: The output signal of the voltage / current selection control circuit is power amplified by the magnetic amplifier driving circuit, and then the magnetic amplifier switching circuit is driven to perform secondary switching chopping on the secondary low-voltage pulse square wave voltage to achieve a "zero" voltage drop secondary voltage stabilization function.

[0041] The beneficial technical effects brought about by the present invention are:

[0042] 1. The present invention adopts high squareness ratio magnetic switch technology to achieve "zero" voltage drop loss, improve the circuit output capacity, and improve the efficiency of the switching power supply.

[0043] 2. Since the magnetic amplifier and the rectifier diode are connected in series, the current mutation during the switching of the rectifier diode is suppressed, the voltage and current stress of the rectifier tube are reduced, the power supply output capacity is improved, and the electromagnetic compatibility performance of the circuit is improved.

[0044] 3. Due to the adoption of the switch-type secondary voltage stabilization method, it can adapt to a wide range of secondary winding voltages, thus solving the problem of interactive voltage regulation between the main voltage and the auxiliary voltage.

[0045] 4. Since two-stage acceleration control is adopted in the voltage sampling and feedback control circuit, the output dynamic performance of the secondary voltage stabilization circuit of the auxiliary circuit is significantly improved.

[0046] 5. The present invention adopts a voltage and current dual-loop control circuit to control the half-bridge dual-magnetic amplifier voltage stabilization circuit, thereby improving the voltage stabilization performance of the secondary voltage stabilization circuit of the auxiliary path.

[0047] The present invention provides a novel magnetic amplifier control circuit and control method, specifically a magnetic amplifier control circuit and control method using "zero" voltage drop technology; the circuit not only solves the interactive voltage regulation problem of the main circuit voltage and the auxiliary circuit voltage of the switching power supply, but also improves the voltage regulation performance and output dynamic performance of the secondary voltage stabilization circuit of the switching power supply; the circuit has incomparable advantages over traditional voltage stabilization control circuits, resulting in breakthrough improvements in the intermodulation performance, dynamic performance and other aspects of the switching power supply, and improving the output current range and overall efficiency of the switching power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a circuit block diagram of the present invention.

[0049] Figure 2 It is a circuit structure diagram of the present invention. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0051] Combine Figure 1 The present invention converts the primary high-voltage pulse square wave voltage into the low-voltage pulse square wave voltage required by the secondary through the transformer secondary conversion circuit; performs secondary switch chopping on the secondary low-voltage pulse square wave voltage through the magnetic amplifier switch circuit to achieve secondary voltage stabilization; rectifies the pulse square wave voltage after switch chopping through the output rectifier circuit, and continues the flow of the filter inductor current; filters the rectified pulse square wave voltage through the output filter circuit to generate a DC voltage; samples the load current of the DC voltage through the current sampling circuit, and converts the current signal into a corresponding voltage signal; and performs amplitude amplification and phase shifting on the voltage signal generated by the current sampling circuit through the current feedback control circuit. The system uses phase compensation to achieve effective control of the output current and response speed. The secondary filtering circuit performs secondary filtering on the DC output voltage to produce a purer DC output voltage. The voltage sampling circuit samples the DC voltage and converts the output voltage into a voltage sampling signal suitable for processing by the voltage feedback control circuit. The voltage feedback control circuit performs amplitude amplification and phase compensation on the voltage signal generated by the voltage sampling circuit to achieve effective control of the output voltage amplitude and response speed. The voltage / current selection control circuit selects between voltage feedback and current feedback. The magnetic amplifier drive circuit amplifies the output signal of the voltage / current selection control circuit, thereby driving the magnetic amplifier switching circuit to perform secondary switching chopping on the secondary low-voltage pulse square wave voltage, achieving a "zero" voltage drop secondary voltage stabilization function.

[0052] like Figure 2As shown, the magnetic amplifier control circuit of the present invention includes a transformer secondary conversion circuit, a magnetic amplifier switching circuit, an output rectifier circuit, an output filter circuit, a current sampling circuit, a current feedback control circuit, a secondary filter circuit, a voltage sampling circuit, a voltage feedback control circuit, a voltage / current selection control circuit, a magnetic amplifier drive circuit and other parts.

[0053] The transformer secondary conversion circuit, consisting of transformer T1's secondary winding, resistor R1, and capacitor C1, converts the primary high-voltage pulsed square wave voltage into the low-voltage pulsed square wave voltage required by the secondary. The use of resistor-capacitor absorption and voltage spike suppression effectively prevents transient voltage spikes from damaging the switching and rectifier transistors.

[0054] The magnetic amplifier switching circuit consists of inductors L1-L2, diodes V1-V2, and resistors R2-R3. This circuit performs secondary switching chopping of the secondary low-voltage pulsed square wave voltage, achieving secondary voltage stabilization. The magnetic amplifier inductors L1-L2 determine the switching chopping performance of the magnetic amplifier switching circuit. In the circuit of the present invention, the magnetic amplifier inductors L1-L2 utilize a squareness ratio as high as 0.95, resulting in zero voltage drop and minimal reset current. By rationally designing the resistance values ​​of R2 and R3 and reducing the inductive reactance, the circuit of the present invention achieves excellent switching chopping performance with "zero" voltage drop.

[0055] As for the output rectifier circuit, the output rectifier circuit is composed of diodes V3 and V4, which play the role of rectifying the pulse square wave voltage after the switch chopped, and the role of freewheeling the filter inductor current.

[0056] As for the output filter circuit, the output filter circuit is composed of an inductor L3, capacitors C2 and C3, which plays the role of filtering the rectified pulse square wave voltage and generating a DC voltage.

[0057] The current sampling circuit is composed of resistors R4 and R5 and capacitor C4, which samples the load current of the DC voltage and converts the current signal into a corresponding voltage signal.

[0058] The current feedback control circuit, consisting of resistors R7-R12, capacitors C9-C10, diode V5, and integrated circuit N101A, amplifies the voltage signal generated by the current sampling circuit and compensates its phase. R11 is used for DC gain amplification, while R12 and C9 are used for AC gain amplification. This ensures effective control of both the output current magnitude and its response speed.

[0059] As for the secondary filtering circuit, the secondary filtering circuit is composed of an inductor L4, a resistor R6, and capacitors C5-C8, which plays a role in performing secondary filtering on the DC output voltage to generate a purer DC output voltage.

[0060] The voltage sampling circuit, consisting of resistors R14-R16 and capacitor C11, samples the DC voltage and converts the output voltage into a voltage sampling signal suitable for processing by the voltage feedback control circuit. The series resistor-capacitor circuits R16 and C11 accelerate the voltage sampling process, improving the dynamic response of the output voltage.

[0061] The voltage feedback control circuit, consisting of resistors R17-R20, capacitors C12-C13, diode V7, and integrated circuit N101B, amplifies and phase-compensates the voltage signal generated by the voltage sampling circuit. R19 is used for DC gain amplification, while R20 and C13 are used for AC gain amplification. This ensures effective control of both the output voltage amplitude and response speed.

[0062] As for the voltage / current selection control circuit, the voltage / current selection control circuit is composed of resistors R13 and R21, and diodes V6 and V8, which play the role of selecting voltage feedback and current feedback.

[0063] As for the magnetic amplifier driving circuit, the magnetic amplifier driving circuit consists of resistors R22-R24, diode V9, and transistors V10-V11, which play the role of power amplification of the output signal of the voltage / current control circuit.

[0064] A magnetic amplifier control circuit designed based on this invention boasts an output voltage of 5V and a wide output current range of 0 to 50A. At currents of 0A, 25A, and 50A, the voltage regulation accuracy is 0.31%, 0.42%, and 0.67%, respectively. This effectively improves the accuracy of the secondary voltage regulation and resolves the voltage regulation issue. Because the magnetic amplifier control circuit and control method of this invention achieve "zero" voltage drop, they also improve the overall efficiency of the switching power supply.

[0065] The present invention has a breakthrough improvement in the intermodulation performance, dynamic performance and other aspects of the switching power supply, thereby increasing the output current range and overall efficiency of the switching power supply.

[0066] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A magnetic amplifier control circuit, characterized in that: It includes a transformer secondary conversion circuit, a magnetic amplifier switching circuit, an output rectifier circuit, an output filter circuit, a current sampling circuit, a current feedback control circuit, a secondary filter circuit, a voltage sampling circuit, a voltage feedback control circuit, a voltage / current selection control circuit and a magnetic amplifier drive circuit; The transformer secondary conversion circuit, the magnetic amplifier switching circuit, the output rectification circuit, the output filtering circuit, the current sampling circuit, the secondary filtering circuit, the voltage sampling circuit, the voltage feedback control circuit, the voltage / current selection control circuit, the magnetic amplifier driving circuit and the magnetic amplifier switching circuit are sequentially connected through circuits; the current sampling circuit, the current feedback control circuit and the voltage / current selection control circuit are sequentially connected through circuits; a transformer secondary conversion circuit configured to provide a pulsed square wave voltage to a magnetic amplifier switching circuit; a magnetic amplifier switching circuit configured to switch and chop the pulsed square wave voltage; an output rectifier circuit configured to rectify the pulsed square wave voltage after the switch chopping; an output filter circuit configured to filter the rectified pulse square wave voltage to generate a DC voltage; a current sampling circuit configured to sample the load current of the DC voltage and convert the current signal into a corresponding voltage signal; a secondary filtering circuit configured to perform secondary filtering on the DC output voltage to generate a pure DC output voltage; A voltage sampling circuit is configured to sample the DC voltage and convert the output voltage into a voltage sampling signal suitable for processing by a voltage feedback control circuit; a voltage feedback control circuit configured to amplify the amplitude and compensate the phase of an error signal between the voltage sampling signal and the voltage reference signal; a current feedback control circuit configured to amplify the amplitude and perform phase compensation on the voltage signal generated by the current sampling circuit; A voltage / current selection control circuit is configured to select voltage feedback and current feedback; The magnetic amplifier driving circuit is configured to perform power amplification on the output signal of the voltage / current selection control circuit.

2. The magnetic amplifier control circuit according to claim 1, wherein: The transformer secondary conversion circuit includes a secondary winding of a transformer T1, a resistor R1, and a capacitor C1; one end of the resistor R1 is connected to one end of the capacitor C1, the other end of the resistor R1 and the opposite-name end of the secondary winding of the transformer T1 form a common end connected to one end of the inductor L2, and the other end of the capacitor C1 and the same-name end of the secondary winding of the transformer T1 form a common end connected to one end of the inductor L1.

3. The magnetic amplifier control circuit according to claim 1, wherein: The magnetic amplifier switching circuit includes inductors L1-L2, diodes V1-V2, and resistors R2-R3; the other end of the inductor L1 and the cathode of the diode V1 form a common end connected to an anode of the diode V3, the other end of the inductor L2 and the cathode of the diode V2 form a common end connected to the other anode of the diode V3, the anode of the diode V1 is connected to one end of the resistor R2, the anode of the diode V2 is connected to one end of the resistor R3, and the other ends of the resistors R2 and R3 form a common end connected to the collectors of the transistors V10 and V11.

4. The magnetic amplifier control circuit according to claim 1, wherein: An output rectifier circuit includes diodes V3 and V4; cathodes of the diodes V3 and V4 form a common terminal connected to one end of the inductor L3, and the anode of the diode V4 is grounded; The output filter circuit includes an inductor L3, capacitors C2 and C3; the other end of the inductor L3, the positive electrode of the capacitor C2 and one end of the capacitor C3 form a common end, which is connected to the common end formed by the resistors R4, R5, R7 and one end of the capacitor C4, and the negative electrode of the capacitor C2 and the other end of the capacitor C3 form a common end and are grounded.

5. The magnetic amplifier control circuit according to claim 1, wherein: A current sampling circuit includes resistors R4 and R5 and a capacitor C4; the resistors R4 and R5 and the other end of the capacitor C4 form a common end connected to the resistor R9 and one end of the inductor L4; A current feedback control circuit includes resistors R7-R12, capacitors C9-C10, a diode V5, and an integrated circuit N101A; the other end of resistor R7, one end of resistor R8, and one end of resistors R11-R12 form a common terminal connected to pin 2 of the integrated circuit N101A, the other end of resistor R8 is grounded, the other end of resistor R12 is connected to one end of capacitor C9, resistor R11, the other end of capacitor C9, and the cathode of diode V6 form a common terminal connected to pin 1 of the integrated circuit N101A; the other end of resistor R9 and the other end of resistor R10 form a common terminal connected to pin 3 of the integrated circuit N101A; the other end of resistor R10 is connected to the cathode of diode V5, and the anode of diode V5 is connected to the voltage reference Vr; pin 8 of the integrated circuit N101A and one end of capacitor C10 form a common terminal connected to the power supply Vcc, and pin 4 of the integrated circuit N101A is grounded.

6. The magnetic amplifier control circuit according to claim 1, wherein: The secondary filter circuit includes an inductor L4, a resistor R6 and capacitors C5-C8; the other end of the inductor L4, one end of the resistor R6, the positive electrode of the capacitor C5 and one end of the capacitors C6-C7 are connected to the output voltage Vo, the other end of the resistor R6, the negative electrode of the capacitor C5, the other end of the capacitor C6 and one end of the capacitor C8 are grounded, and the other ends of the capacitors C7 and C8 are connected to the mechanical ground, that is, the earth.

7. The magnetic amplifier control circuit according to claim 1, wherein: A voltage sampling circuit includes resistors R14-R16 and a capacitor C11; one end of resistor R14 and capacitor C11 forms a common terminal connected to the output voltage Vo, the other end of capacitor C11 is connected to one end of resistor R16, the other ends of resistors R14 and R16 and one end of resistor R15 form a common terminal connected to pin 6 of integrated circuit N101B, and the other end of resistor R15 is grounded; A voltage feedback control circuit includes resistors R17-R20, capacitors C12-C13, a diode V7, and an integrated circuit N101B; one end of resistors R17-R18, one end of capacitor C12, and the cathode of diode V7 form a common terminal connected to the voltage reference Vr, the other end of resistor R17 is connected to the power supply Vcc, the other end of resistor R18 is connected to pin 5 of the integrated circuit N101B, the other end of capacitor C12 and the anode of diode V7 form a common terminal connected to ground; the other end of resistor R20 is connected to one end of capacitor C9, and the other end of resistor R19, capacitor C13, and the cathode of diode V8 form a common terminal connected to pin 7 of N101B.

8. The magnetic amplifier control circuit according to claim 1, wherein: The voltage / current selection control circuit includes resistors R13 and R21 and diodes V6 and V8; the anode of diode V6 is connected to one end of resistor R13, the anode of diode V8 is connected to one end of resistor R21, and the other ends of resistors R13 and R21 form a common end, which is connected to the base of transistor V10.

9. The magnetic amplifier control circuit according to claim 1, wherein: The magnetic amplifier drive circuit includes resistors R22-R24, a diode V9, and transistors V10-V11; one end of the resistors R22-R24 and the cathode of the diode V9 form a common end, which is connected to the power supply Vcc; the other end of the resistor R22 and the anode of the diode V9 form a common end, which is connected to the base of the transistor V10; the other end of the resistor R23 is connected to the emitter of the transistor V10 and the base of the transistor V11, and the other end of the resistor R24 ​​is connected to the emitter of the transistor V11; the common end formed by the collectors of the transistors V10 and V11 is connected to the common end formed by the resistor R2 and the other end of the resistor R3.

10. A magnetic amplifier control method, characterized in that: The magnetic amplifier control circuit according to claim 1 specifically comprises the following steps: Step 1: The primary high-voltage pulse square wave voltage is converted into the low-voltage pulse square wave voltage required by the secondary through the transformer secondary conversion circuit; Step 2: Through the magnetic amplifier switching circuit, the secondary low-voltage pulse square wave voltage is subjected to secondary switching chopping to achieve secondary voltage stabilization; Step 3: The output rectifier circuit rectifies the pulse square wave voltage after the switch chopping, and freewheels the filter inductor current; Step 4: Filter the rectified pulse square wave voltage through the output filter circuit to generate a DC voltage; Step 5: Sample the load current of the DC voltage through the current sampling circuit and convert the current signal into a corresponding voltage signal; Step 6: Through the current feedback control circuit, the voltage signal generated by the current sampling circuit is amplified and phase compensated to achieve effective control of the output current size and response speed; Step 7: Perform secondary filtering on the DC output voltage through a secondary filtering circuit to generate a purer DC output voltage; Step 8: The DC voltage is sampled by a voltage sampling circuit, and the output voltage is converted into a voltage sampling signal suitable for processing by a voltage feedback control circuit; Step 9: Through the voltage feedback control circuit, the voltage signal generated by the voltage sampling circuit is amplified and phase compensated to achieve effective control of the output voltage amplitude and response speed; Step 10: Select voltage feedback and current feedback through the voltage / current selection circuit; Step 11: The output signal of the voltage / current selection control circuit is power amplified by the magnetic amplifier driving circuit, and then the magnetic amplifier switching circuit is driven to perform secondary switching chopping on the secondary low-voltage pulse square wave voltage to achieve a "zero" voltage drop secondary voltage stabilization function.

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