Satellite-borne high-voltage magnetic isolation wide pulse signal transmission circuit

Abstract

The application provides a kind of satellite high-voltage magnetic isolation wide pulse signal transmission circuit, including pulse signal edge transmission circuit, pulse signal recovery circuit and pulse width limiting circuit;The leading edge and trailing edge position information of wide pulse control signal is transmitted from the primary isolation of the amplification driving transformer of pulse signal edge transmission circuit to the secondary, and the wide pulse signal is reformed through pulse signal recovery circuit, the pulse width of primary and secondary pulse signal is consistent, and the phase relationship is kept synchronous, while pulse width limiting circuit limits the output pulse width, realizes the isolated transmission of wide pulse signal.The application realizes the design goal of lossless and efficient transmission of pulse signal with arbitrary pulse width from low-voltage side to high-voltage side based on the circuit topology.

Description

Technical Field

[0001] This invention belongs to the field of spaceborne high-voltage power supply technology, and relates to a space-based high-voltage power supply isolation pulse signal transmission circuit. Background Technology

[0002] The pulse traveling wave tube (TWT) amplifier, a core component in spaceborne radar and communication systems, amplifies the power of the microwave radio frequency signal input to the TWT. The TWT amplifier power supply receives a low-voltage pulse control signal (typically a TTL signal) from the satellite integrated management unit. This signal is then transmitted to the TWT amplifier power supply modulator module via a high-voltage power supply isolation pulse signal transmission circuit. This modulator module generates a high-voltage pulse modulation signal, which is a floating modulation signal. Its reference voltage is the TWT cathode voltage K (typically around -6000V to -15000V). The positive and negative square wave voltages G generated by the modulator module (based on the cathode voltage K) control the conduction or cutoff of the electron beam in the TWT, producing a variable (pulse width, period) pulse waveform. The waveform diagram of the wide pulse signal transmission is shown below. Figure 1 As shown.

[0003] To achieve high-resolution observation of targets by spaceborne radar systems, spaceborne pulse traveling wave tube amplifiers typically employ wide modulation pulse widths, with the longest pulse widths reaching several milliseconds. Currently, for the isolation transmission of wide-pulse square wave control signals exceeding milliseconds, optocoupler isolation or transformer magnetic isolation is commonly used. However, optocouplers suffer from radiation displacement damage in space applications, requiring additional radiation hardening measures. Furthermore, the primary-secondary isolation voltage of optocouplers is typically less than 2500V, making it difficult to meet the high-voltage isolation requirements. Most spaceborne pulse traveling wave tube amplifier products utilize transformer magnetic isolation for wide-pulse signal transmission. By encapsulating the primary and secondary sides of the transformer, 20000V voltage isolation can be achieved. Simultaneously, as passive components, transformers do not suffer from magnetic permeability attenuation due to radiation, exhibiting excellent radiation resistance. For transformer-magnetically isolated transmission of wide-pulse square wave control signals, programmable gate array (PGA) chips are typically used to extract the leading and trailing edge position information of the preceding low-voltage square wave control signal. This position information is then transmitted to the secondary winding of the amplifier driving transformer via an H-bridge circuit. The transformer further drives the high-voltage switching link in the modulator through a rectifier circuit, thereby modulating the microwave RF signal output from the traveling wave tube (TWT). However, with the increasing width of the pulse square wave control signal in spaceborne pulse TWT amplifiers, the computational resources required for PGA chips to extract position information and drive the H-bridge signal output have increased dramatically. Simultaneously, the cost of aerospace-grade PGA devices and the scale of pulse signal transmission circuits further limit their promotion and use in spaceborne pulse products.

[0004] For pulse traveling wave tube (TWT) amplifiers, considering the power consumption and reliability of the TWT and its power supply, and to prevent human error from causing abnormal pulse width, it is usually necessary to limit the width of the output pulse signal. Conventional pulse width limiting circuits use operational amplifiers and comparators. The operational amplifier converts the square wave signal into a triangular wave signal, which is then compared with a fixed reference voltage to generate the pulse width limiting circuit. This circuit has numerous components and a complex form, making it unsuitable for miniaturization, weight reduction, and manufacturing-oriented design requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art. The present invention provides a spaceborne high-voltage magnetically isolated wide pulse signal transmission circuit. Based on the circuit topology, the design goal of lossless and efficient transmission of pulse signals of arbitrary pulse width from the low-voltage side to the high-voltage side is realized. This is conducive to the design goals of lightweighting, miniaturization and mass production of high-voltage spaceborne power supplies, and has broad application prospects.

[0006] The technical solution adopted in this invention is: a spaceborne high-voltage magnetically isolated wide pulse signal transmission circuit, including a pulse signal edge transmission circuit, a pulse signal recovery circuit, and a pulse width limiting circuit;

[0007] The leading and trailing edge position information of the wide pulse control signal is isolated and transmitted from the primary stage of the amplification drive transformer of the pulse signal edge transmission circuit to the secondary stage, and then reconstructed into a wide pulse signal through the pulse signal recovery circuit. The pulse widths of the primary and secondary pulse signals are kept consistent, and their phase relationship is kept synchronized. At the same time, the pulse width limiting circuit limits the output pulse width to achieve isolated transmission of the wide pulse signal.

[0008] Furthermore, the pulse signal edge transmission circuit includes a transistor Q1, diodes D1-D5, a Zener diode D6, resistors R1-R4, and an isolation transformer T1. The single-ended pulse square wave signal S1 sent by the pre-amplifier circuit is input from one end of resistor R1. The other end of resistor R1 is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the primary side of isolation transformer T1. The anode of diode D5 is connected to the anode of Zener diode D6. Diode D5 and Zener diode D6 are connected in series and then in parallel to the primary side of isolation transformer T1. The cathode of diode D1 is connected to the secondary side of isolation transformer T1 and the anode of diode D2. The anode of diode D1 is grounded. The cathode of diode D2 is connected to one end of resistor R3, and the other end of resistor R3 is grounded. The cathode of diode D4 is connected to the secondary side of isolation transformer T1 and the anode of diode D3. The anode of diode D4 is grounded. The cathode of diode D3 is connected to one end of resistor R4, and the other end of resistor R4 is grounded.

[0009] Furthermore, the pulse signal edge transmission circuit receives the single-ended pulse square wave signal S1 sent by the preceding circuit, controls the transistor Q1 to turn on and off, extracts the leading edge and trailing edge of the pulse square wave control signal, and transmits the leading edge and trailing edge position information to the secondary side in the form of edge pulse differential signal S2 through the amplification drive transformer T1. Then, the edge pulse differential signal is decomposed into two single-ended signals S3 and S4 by a single-phase rectifier circuit built by diodes D1 to D4. The two single-ended signals contain the leading edge and trailing edge position information respectively.

[0010] Furthermore, the pulse signal recovery circuit includes inverters U1 and U4, a JK flip-flop U2, an AND gate U3, and resistors R5 to R8;

[0011] One end of resistor R5 is connected to the cathode of diode D2, and the other end of resistor R5 is connected to the input of inverter U1. The output of inverter U1 is connected to the set pin (SET) of JK flip-flop U2 and resistor R7, which is grounded. One end of resistor R6 is connected to the cathode of diode D3, and the other end of resistor R6 is connected to the input of AND gate U3. The output of AND gate U3 is connected to the input of inverter U4. The output of inverter U4 is connected to the reset pin (CLR) of JK flip-flop U2 and resistor R8, which is grounded.

[0012] Furthermore, the pulse signal recovery circuit uses inverters U1 and U4 to invert two single-ended signals S3 and S4 containing leading and trailing edge position information to obtain two single-ended edge signals S5 and S6, respectively. These signals control the set (SET) and reset (CLR) pins of the JK flip-flop U2 to recover the pulse signal, ensuring that the pulse width and phase difference between the primary pulse signal S1 and the secondary pulse signal S7 remain consistent.

[0013] Furthermore, the pulse width limiting circuit includes inverters U5 and U6, resistors R9 and R... 10 Diode D7, capacitor C1; the output of JK flip-flop U2 is connected to one end of resistor R9 and resistor R1 respectively. 10 One end of resistor R9 is connected to the input terminal of inverter U6, and the other end of resistor R... 10 The other end is connected to the cathode of diode D7, the anode of diode D7 is connected to the input of inverter U6, the output of inverter U6 is connected to the input of inverter U5, the output of inverter U5 is connected to the input of logic AND gate U3, and the input of inverter U6 is connected to capacitor C1, which is grounded.

[0014] Furthermore, the pulse width limiting circuit samples the pulse signal output by the JK flip-flop U2, which is then transmitted through resistors R9 and R... 10The delay circuit built with capacitor C1 and D7, as well as inverters U5 and U6, delays the pulse signal for a time τ. When the pulse width is greater than the time τ, the output signal of the AND gate U3 is a low-level signal. After passing through inverter U4, it controls the reset signal of JK flip-flop U2 to be always high, thus preventing JK flip-flop U2 from outputting the pulse signal.

[0015] Furthermore, the pulse width of the leading-edge pulse signal is affected by the input voltage U of the isolation transformer T1. i The value of the current limiting resistor R2 and the excitation inductance of the isolation transformer T1 are determined. The pulse width of the trailing edge pulse signal is determined by the value of the reflected voltage of the isolation transformer T1, the value of the diode D5 and the value of the Zener diode D6. By adjusting the corresponding parameters, pulse signal transmission of arbitrary width can be achieved.

[0016] The advantages of this invention compared to the prior art are:

[0017] (1) The spaceborne high-voltage magnetically isolated wide pulse signal transmission circuit of the present invention resolves the pulse square wave signal into a bipolar pulse edge signal that is easy to transmit with magnetic isolation. It does not require a magnetic reset winding to magnetically reset the drive transformer, reducing the circuit size and effectively improving the reliability and stability of error signal transmission. At the same time, the circuit only uses discrete components such as transistors, inverters, logic AND chips, and JK flip-flops, without the need for highly integrated programmable gate array chips, which is low in cost and easy to promote.

[0018] (2) The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit of the present invention uses a high-frequency high-voltage isolation transformer to achieve isolated transmission of pulse signals. Electrical insulation between the low-voltage side and the high-voltage side is achieved by adjusting the winding spacing between the primary and secondary sides of the transformer. If necessary, solid-state potting can be used to increase its insulation strength. Compared with the optocoupler transmission method, it effectively reduces the size and weight of the entire circuit and improves the anti-interference capability of the circuit.

[0019] (3) The spaceborne high-voltage magnetically isolated wide pulse signal transmission circuit of the present invention realizes the maximum pulse width limitation of the pulse signal through delay circuit and logic AND circuit, thereby improving the reliability and stability of the pulse signal transmission process.

[0020] (4) The number of components to be adjusted in the spaceborne high-voltage magnetically isolated wide pulse signal transmission circuit of the present invention is small. Only the resistance and capacitance parameters of the delay circuit in the pulse width limiting circuit need to be adjusted according to the maximum pulse width limitation requirements. The circuit is simple to debug, has strong consistency, and meets the design requirements for manufacturing. Attached Figure Description

[0021] Figure 1 A waveform diagram of a wide pulse signal transmission;

[0022] Figure 2This is a block diagram of a pulse signal edge transmission circuit.

[0023] Figure 3 This is a block diagram of the pulse signal recovery circuit and the pulse width limiting circuit.

[0024] Figure 4 Waveform diagram of the isolation and transmission process for wide pulse signals;

[0025] Figure 5 This is a circuit simulation model diagram;

[0026] Figure 6 The circuit simulation results are shown in the diagram.

[0027] Figure 7 The graph shows the actual measurement results (blue input / orange output). Detailed Implementation

[0028] The present invention will be described in conjunction with the accompanying drawings.

[0029] The high-voltage magnetically isolated wide-pulse signal transmission circuit proposed in this invention uses transistors, diodes, a drive transformer, and passive components to build a circuit to achieve transformer magnetic isolation transmission of wide-pulse signals. A preset JK flip-flop is used to convert single-ended signals into TTL signals. At the high-voltage end, the JK flip-flop receives the single-ended signal transmitted from the previous stage and restores the pulse modulation signal to a TTL signal, thereby driving the subsequent high-voltage switching chain. Simultaneously, the TTL signal output by the JK flip-flop is transmitted to a Schmitt trigger via RC integration. The Schmitt trigger signal returns to the JK flip-flop, achieving trailing edge triggering. When the pulse width is less than the limited pulse width, the trailing edge signal of the modulated pulse triggers the JK flip-flop, restoring the pulse width. When the pulse width is greater than the limited pulse width, the high-level signal generated by the pulse leading edge signal is used to generate the pulse trailing edge signal in advance via RC integration and Schmitt triggering, achieving pulse width limitation. By adjusting the RC integration constant, the pulse modulation signal width limitation is achieved.

[0030] A spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit includes a pulse signal edge transmission circuit, a pulse signal recovery circuit, and a pulse width limiting circuit.

[0031] The pulse signal edge transmission circuit mainly includes transistor Q1, diodes D1-D5, Zener diode D6, resistors R1-R4, and isolation transformer T1. The single-ended pulse square wave signal S1 sent by the pre-amplifier circuit is input from one end of resistor R1. The other end of resistor R1 is connected to the base of transistor Q1, and the emitter of transistor Q1 is grounded. The collector of transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the primary winding of isolation transformer T1. The anode of diode D5 is connected to the anode of Zener diode D6. Diodes D5 and D6 are connected in series and then in parallel to the primary winding of isolation transformer T1. The cathode of diode D1 is connected to the secondary winding of isolation transformer T1 and the anode of diode D2. The anode of diode D1 is grounded. The cathode of diode D2 is connected to one end of resistor R3, and the other end of resistor R3 is grounded. The cathode of diode D4 is connected to the secondary winding of isolation transformer T1 and the anode of diode D3. The anode of diode D4 is grounded. The cathode of diode D3 is connected to one end of resistor R4, and the other end of resistor R4 is grounded. The pulse signal edge transmission circuit receives the single-ended pulse square wave signal S1 sent by the preceding circuit to control the conduction and cutoff of transistor Q1, thereby extracting the leading and trailing edges of the pulse square wave control signal. The position information of the leading and trailing edges is transmitted to the secondary side in the form of edge pulse differential signal S2 through the amplified drive transformer T1. Then, the edge pulse differential signal is decomposed into two single-ended signals S3 and S4 by the single-phase rectifier circuit built by D1 to D4, and the two single-ended signals contain the position information of the leading and trailing edges respectively. Resistor R1 is the driving resistor for transistor Q1, diode D5 and Zener diode D6 form the absorption circuit of the preceding winding of drive transformer T1, resistors R3 and R4 are the load resistors of the single-phase rectifier circuit, and resistor R2 is the current-limiting resistor. Its principle block diagram is shown below. Figure 2 As shown.

[0032] The pulse signal recovery circuit mainly includes inverters U1 and U4, JK flip-flop U2, AND gate U3, and resistors R5 to R8. One end of resistor R5 is connected to the cathode of diode D2, and the other end of resistor R5 is connected to the input of inverter U1. The output of inverter U1 is connected to the set pin (SET) of JK flip-flop U2 and resistor R7, which is grounded. One end of resistor R6 is connected to the cathode of diode D3, and the other end of resistor R6 is connected to the input of AND gate U3. The output of AND gate U3 is connected to the input of inverter U4. The output of inverter U4 is connected to the reset pin (CLR) of JK flip-flop U2 and resistor R8, which is grounded. The pulse signal recovery circuit uses inverters U1 and U4 to invert two single-ended signals containing leading and trailing edge position information to obtain two single-ended edge signals S5 and S6, which control the set (SET) and reset (CLR) pins of JK flip-flop U2, respectively, to realize pulse signal recovery and ensure that the pulse width and phase difference of the primary pulse signal S1 and the secondary pulse signal S7 are consistent.

[0033] The pulse width limiting circuit mainly includes inverters U5 and U6, resistors R9 and R10. 10 Diode D7, capacitor C1. The output of JK flip-flop U2 is connected to one end of resistor R9 and resistor R. 10 One end of resistor R9 is connected to the input terminal of inverter U6, and the other end of resistor R... 10 The other end is connected to the cathode of diode D7. The anode of diode D7 is connected to the input of inverter U6. The output of inverter U6 is connected to the input of inverter U5. The output of inverter U5 is connected to the input of AND gate U3. The input of inverter U6 is connected to capacitor C1, which is grounded. The pulse width limiting circuit samples the pulse signal output by JK flip-flop U2, which is then transmitted through resistors R9 and R... 10 The delay circuit built with capacitor C1 and capacitor D7, along with inverters U5 and U6, delays the pulse signal by time τ. When the pulse width is greater than time τ, the output signal of the AND gate is a low-level signal. After passing through the inverter, this signal controls the reset signal of the JK flip-flop U2 to remain high, thereby preventing the JK flip-flop U2 from outputting the pulse signal.

[0034] The leading and trailing edge position information of the wide pulse control signal is isolated and transmitted from the primary stage of the amplification drive transformer to the secondary stage. It is then reconstructed by a pulse recovery circuit into a wide pulse signal that can be suspended on the high voltage. The pulse widths of the primary and secondary pulse signals are consistent, and their phase relationship remains synchronized. Simultaneously, the output pulse width is effectively limited according to the requirements of the pulse high-voltage power supply used in the circuit of this invention, thereby achieving isolated transmission of the wide pulse signal. Its principle block diagram is shown below. Figure 3 As shown.

[0035] The narrowest pulse width of the spaceborne wide-pulse signal transmission circuit proposed in this invention is constrained by the leading and trailing edge pulse widths. Its waveform changes during pulse signal transmission are as follows: Figure 4 As shown. The pulse width of the leading-edge pulse signal is affected by the input voltage U. i The pulse width of the trailing edge pulse signal is determined by parameters such as the current-limiting resistor R2 and the magnetizing inductance of transformer T1, while the pulse width of the trailing edge pulse signal is determined by parameters such as the reflected voltage of transformer T1, diode D5, and Zener diode D6. Generally, pulse signal transmission of arbitrary width can be achieved by adjusting the corresponding parameters.

[0036] The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit proposed in this invention is constructed using discrete components. The simulation and physical verification of the spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit proposed in this invention are based on the component selection in Table 1 below.

[0037] Table 1

[0038] Serial Number Position Specifications and Models Serial Number Position Specifications and Models 1 R1 RMK3216-0.25W-102-K 14 D4 2CK6642US 2 R2 RMK3216-0.25W-102-K 15 D5 2CK6642US 3 R3 RMK3216-0.25W-202-K 16 D6 ZW4106UR 4 R4 RMK3216-0.25W-202-K 17 D7 2CK6642US 5 R5 RMK3216-0.25W-103-K 18 Q1 3DK3700UB 6 R6 RMK3216-0.25W-103-K 19 U1 BH54HC14 7 R7 RMK3216-0.25W-102-K 20 U2 BH54HC14 8 R8 RMK3216-0.25W-102-K 21 U3 BH54HC109 9 R9 RMK3216-0.25W-213-K 22 U4 BH54HC14 10 R10 RMK3216-0.25W-102-K 23 U5 BH54HC14 11 D1 2CK6642US 24 U6 BH54HC14 12 D2 2CK6642US 25 C1 CT41L-0805-2C1-100V-104 13 D3 2CK6642US

[0039] The simulation circuit model based on the above selected components is as follows: Figure 5 As shown, the simulation results are as follows: Figure 6 As shown, the measured results are as follows: Figure 7 As shown, the simulation results are basically consistent with the measured results, meeting the performance requirements of the pulse high-voltage power supply using the circuit of this invention. Simulation and experimental verification: The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit proposed in this invention has advantages such as simple principle, easy implementation, stable and reliable performance, and suitability for manufacturing, and has broad application prospects.

[0040] The parts of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit, characterized in that, This includes a pulse signal edge transmission circuit, a pulse signal recovery circuit, and a pulse width limiting circuit; The leading and trailing edge position information of the wide pulse control signal is transmitted from the primary isolation stage of the amplification drive transformer in the pulse signal edge transmission circuit to the secondary stage, and then reconstructed into a wide pulse signal through the pulse signal recovery circuit. The pulse widths of the primary and secondary pulse signals are kept consistent, and their phase relationship is kept synchronized. At the same time, the pulse width limiting circuit limits the output pulse width to achieve isolated transmission of the wide pulse signal. The pulse signal edge transmission circuit includes transistor Q1, diodes D1-D5, Zener diode D6, resistors R1-R4, and isolation transformer T1. A single-ended pulse square wave signal S1, sent by the pre-amplifier circuit, is input from one end of resistor R1. The other end of resistor R1 is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the primary winding of isolation transformer T1. The anode of diode D5 is connected to the anode of Zener diode D6. Diode D5 and Zener diode D6 are connected in series and then in parallel to the primary winding of isolation transformer T1. The cathode of diode D1 is connected to the secondary winding of isolation transformer T1 and the anode of diode D2, and the anode of diode D1 is grounded. The cathode of diode D2 is connected to one end of resistor R3, and the other end of resistor R3 is grounded. The cathode of diode D4 is connected to the secondary winding of isolation transformer T1 and the anode of diode D3, and the anode of diode D4 is grounded. The cathode of diode D3 is connected to one end of resistor R4, and the other end of resistor R4 is grounded. The pulse signal recovery circuit includes inverters U1 and U4, JK flip-flop U2, AND gate U3, and resistors R5 to R8; One end of resistor R5 is connected to the cathode of diode D2, and the other end of resistor R5 is connected to the input of inverter U1. The output of inverter U1 is connected to the set pin (SET) of JK flip-flop U2 and resistor R7, which is grounded. One end of resistor R6 is connected to the cathode of diode D3, and the other end of resistor R6 is connected to the input of AND gate U3. The output of AND gate U3 is connected to the input of inverter U4. The output of inverter U4 is connected to the reset pin (CLR) of JK flip-flop U2 and resistor R8, which is grounded. The pulse width limiting circuit includes inverters U5 and U6, resistors R9 and R1. 10 Diode D7, capacitor C1; the output of JK flip-flop U2 is connected to one end of resistor R9 and resistor R1 respectively. 10 One end of resistor R9 is connected to the input terminal of inverter U6, and the other end of resistor R... 10 The other end is connected to the cathode of diode D7, the anode of diode D7 is connected to the input of inverter U6, the output of inverter U6 is connected to the input of inverter U5, the output of inverter U5 is connected to the input of logic AND gate U3, and the input of inverter U6 is connected to capacitor C1, which is grounded.

2. The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit according to claim 1, characterized in that, The pulse signal edge transmission circuit receives the single-ended pulse square wave signal S1 sent by the preceding circuit, controls the transistor Q1 to turn on and off, extracts the leading edge and trailing edge of the pulse square wave control signal, and transmits the leading edge and trailing edge position information to the secondary side in the form of edge pulse differential signal S2 through the amplification drive transformer T1. Then, the edge pulse differential signal is decomposed into two single-ended signals S3 and S4 by a single-phase rectifier circuit built by diodes D1~D4. The two single-ended signals contain the leading edge and trailing edge position information respectively.

3. The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit according to claim 2, characterized in that, The pulse signal recovery circuit uses inverters U1 and U4 to invert two single-ended signals S3 and S4 containing leading and trailing edge position information to obtain two single-ended edge signals S5 and S6, which control the set (SET) and reset (CLR) pins of JK flip-flop U2, respectively, to realize pulse signal recovery and ensure that the pulse width and phase difference of the primary pulse signal S1 and the secondary pulse signal S7 are consistent.

4. The spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit according to claim 3, characterized in that, The pulse width limiting circuit samples the pulse signal output by the JK flip-flop U2, which is then passed through resistors R9 and R... 10 The delay circuit built with capacitor C1 and D7, as well as inverters U5 and U6, delays the pulse signal for a time τ. When the pulse width is greater than the time τ, the output signal of the AND gate U3 is a low-level signal. After passing through inverter U4, it controls the reset signal of JK flip-flop U2 to be always high, thus preventing JK flip-flop U2 from outputting the pulse signal.

5. A spaceborne high-voltage magnetically isolated wide-pulse signal transmission circuit according to claim 4, characterized in that, The pulse width of the leading-edge pulse signal is affected by the input voltage U of the isolation transformer T1. i The value of the current limiting resistor R2 and the excitation inductance of the isolation transformer T1 are determined. The pulse width of the trailing edge pulse signal is determined by the value of the reflected voltage of the isolation transformer T1, the value of the diode D5 and the value of the Zener diode D6. By adjusting the corresponding parameters, pulse signal transmission of arbitrary width can be achieved.

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