Charging unit and pulse laser power supply system

Abstract

The utility model belongs to the technical field of power supply circuits, and aims to provide a charging unit and a pulse laser power supply system. According to the utility model, the reliability of the charging unit is high, so that the stability and reliability of equipment to be charged such as a pulse laser power supply system can be improved; the pulse laser power supply system can guarantee that currents flowing through the first main discharge switch and the second main discharge switch are the same, the situation that the main discharge switch of the loop is damaged due to the fact that one path of current is too large is avoided, and meanwhile the conduction time of the main discharge switch can be shortened through the coupling current sharing inductor. And the conduction time consistency of the two main discharge switches is improved, so that the output energy consistency of the pulse laser power supply is improved. In addition, the main charging unit in the utility model adopts a double-loop output design, so that the pulse laser power supply can run in a descending manner under the condition of failure, and is more economical.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply circuits, and in particular relates to a charging unit and a pulse laser power supply system. Background Art

[0002] With the continuous development and application of large-scale laser devices in the scientific and industrial fields, higher requirements are placed on the working performance and energy output of laser devices. Due to the characteristics of pulsed xenon lamps, such as strong load capacity, high pumping efficiency, good laser beam quality and long life, large-scale laser devices generally use high-power pulsed xenon lamps as the pump source of the laser.

[0003] Pulse xenon lamps used in large laser devices have the characteristics of high internal pressure, large size, high length, and high trigger voltage. Pulse xenon lamps need to be triggered by high voltage and then discharged by pulsed high current to produce strong light. Therefore, a pulse laser power supply that can provide high voltage and high power output is required during the light emission process of pulse xenon lamps. Pulse laser power supplies generally charge and store energy in the energy storage unit over a long period of time, and discharge the energy storage unit in a very short time. Pulse xenon lamps produce instantaneous and extremely strong light output through instantaneous discharge.

[0004] However, in the process of using the prior art, the inventors found that the prior art has at least the following problems:

[0005] The charging unit in the circuit of the pulse laser power supply provides a charging unit for the pulse laser power supply, which has the characteristics of high charging voltage, high charging current and long working time during operation. In the prior art, a single output circuit is generally used to charge the pulse laser power supply energy storage capacitor, which makes the device current stress and heat generation of the charging unit output circuit large, and has the problem of low reliability during long-term operation, which is not conducive to ensuring the stability and reliability of the pulse laser power supply during long-term use. Utility Model Content

[0006] In order to solve the above technical problems at least to a certain extent, the utility model provides a charging unit and a pulse laser power supply system.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] In the first aspect, the utility model provides a charging unit, including a charging extension, a high-frequency voltage transformation circuit, a charging protection circuit and a high-voltage voltage divider circuit; the high-frequency voltage transformation circuit includes a high-frequency transformer and a power conversion circuit, the two output ends of the charging extension are respectively connected to the two ends of the primary coil of the high-frequency transformer, the two ends of the secondary coil of the high-frequency transformer are respectively connected to the two input ends of the power conversion circuit, the high-voltage output end of the power conversion circuit is connected to the charging protection circuit and serves as the high-voltage output end of the charging unit, the negative pole of the power conversion circuit serves as the low-voltage output end of the charging unit, and the two ends of the high-voltage voltage divider circuit are respectively connected to the high-voltage output end of the charging unit and the low-voltage output end of the charging unit.

[0009] In one possible design, the charging protection circuit includes a first resistor, a second resistor and a freewheeling high-voltage silicon stack. The high-voltage output end of the power conversion circuit is connected to the first resistor and the second resistor in sequence and serves as the high-voltage output end of the charging unit. The negative electrode of the freewheeling high-voltage silicon stack is connected to the junction of the first resistor and the second resistor, and the positive electrode of the freewheeling high-voltage silicon stack is connected to the negative electrode of the power conversion circuit.

[0010] In one possible design, the high-voltage voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, the resistance of the first voltage-dividing resistor is greater than the resistance of the second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the high-voltage output end of the charging unit, and the other end of the first voltage-dividing resistor is connected to the low-voltage output end of the charging unit through the second voltage-dividing resistor.

[0011] In one possible design, the power conversion circuit adopts a full-bridge rectifier circuit, which includes a first high-voltage silicon stack, a second high-voltage silicon stack, a third high-voltage silicon stack and a fourth high-voltage silicon stack, the cathode of the first high-voltage silicon stack is connected to the cathode of the second high-voltage silicon stack, the anode of the first high-voltage silicon stack is connected to the cathode of the third high-voltage silicon stack, the anode of the second high-voltage silicon stack is connected to the cathode of the fourth high-voltage silicon stack, the anode of the third high-voltage silicon stack is connected to the anode of the fourth high-voltage silicon stack, the junction point of the first high-voltage silicon stack and the third high-voltage silicon stack, and the junction point of the second high-voltage silicon stack and the fourth high-voltage silicon stack are two input ends of the power conversion circuit, the junction point of the first high-voltage silicon stack and the second high-voltage silicon stack is the high-voltage output end of the power conversion circuit, and the junction point of the third high-voltage silicon stack and the fourth high-voltage silicon stack is the low-voltage output end of the power conversion circuit.

[0012] In one possible design, the charging unit also includes a current detection resistor, which is connected in series to the negative pole of the power conversion circuit, the two current detection terminals of the charging extension are respectively connected to the two ends of the current detection resistor, and the voltage detection terminal of the charging extension is connected to the high-voltage voltage divider circuit.

[0013] In the second aspect, the utility model discloses a pulse laser power supply system, comprising a charging unit as described in any one of the above items, and the charging units are provided with two, the two charging units are divided into a main charging unit and a pre-charging unit, and the main charging unit is provided with two high-voltage output terminals; the pulse laser power supply system also includes a control unit, a main energy storage unit group, a main discharge switch, a coupled current-sharing inductor, a wave modulation inductor, a pre-energy storage unit and a pre-discharge switch, the main discharge switch is divided into a first main discharge switch and a second main discharge switch, and the main energy storage unit group is divided into a first main energy storage unit group and a second main energy storage unit group; the control unit is connected to the communication interface of the main charging unit through an optical fiber; the two high-voltage output terminals of the main charging unit are respectively connected to the first main energy storage unit The high voltage end of the first main energy storage unit group is connected to the high voltage end of the second main energy storage unit group, the low voltage output end of the main charging unit is single-point grounded, the high voltage end of the first main energy storage unit group is also connected to the anode of the first main discharge switch, the high voltage end of the second main energy storage unit group is also connected to the anode of the second main discharge switch, and the low voltage end of the first main energy storage unit group and the low voltage end of the second main energy storage unit group are both grounded; the cathode of the first main discharge switch and the cathode of the second main discharge switch are both connected to one end of the modulation inductor through the coupled current-sharing inductor, and the other end of the modulation inductor serves as the output end of the pulse laser power supply system; the control unit is also connected to the trigger input interface of the first main discharge switch and the second main discharge switch through an optical fiber;

[0014] The control unit is connected to the communication interface of the pre-charging unit through an optical fiber; the high-voltage output end of the pre-charging unit is connected to the high-voltage end of the pre-energy storage unit, and the low-voltage output end of the pre-charging unit is single-point grounded; the high-voltage end of the pre-energy storage unit is connected to the anode of the pre-discharge switch, the low-voltage end of the pre-energy storage unit is grounded, and the cathode of the pre-discharge switch is connected to the modulation inductor; the control unit is also connected to the trigger input interface of the pre-discharge switch through an optical fiber.

[0015] In one possible design, the first main energy storage unit group and the second main energy storage unit group each include multiple main energy storage units; the main energy storage unit includes a main capacitor and a protective inductor, the negative electrode of the main capacitor is grounded as the low-voltage end of the main energy storage unit, the positive electrode of the main capacitor is connected to the input end of the protective inductor, and the output end of the protective inductor serves as the high-voltage end of the main energy storage unit.

[0016] In a possible design, the first main discharge switch, the second main discharge switch and the pre-discharge switch are all semiconductor controlled silicon thyristor discharge switches.

[0017] In one possible design, the pre-energy storage unit includes a pre-capacitor and a pre-ionization inductor, the negative electrode of the pre-capacitor is grounded as the low-voltage end of the pre-energy storage unit, the positive electrode of the pre-capacitor is connected to the input end of the pre-ionization inductor, and the output end of the pre-ionization inductor serves as the high-voltage end of the pre-energy storage unit.

[0018] In a possible design, the number of main energy storage units in the first main energy storage unit group and the second main energy storage unit group is the same, both are 6; the number of the modulating inductors is 20, the input ends of the 20 modulating inductors are all connected to the coupled current-sharing inductors, and the output ends of the 20 modulating inductors are connected to the coaxial discharge cables as 20 output ends of the pulsed laser power supply system.

[0019] The beneficial effects of the utility model are as follows:

[0020] 1) The charging unit in the utility model has high reliability, which can help improve the stability and reliability of devices waiting to be charged, such as pulse laser power supply systems. Specifically, in the utility model, the high-frequency transformer in the high-frequency transformer circuit is used to reduce or increase the power output of the charging extension to change the output power voltage of the charging extension, and the power conversion circuit is used to convert the AC power output by the high-frequency transformer into DC power; the charging protection circuit can protect the high-frequency transformer circuit to prevent it from being affected by reverse voltage; the high-voltage voltage divider circuit is used to reduce the high voltage output by the high-voltage output end of the charging unit to a suitable value to meet the charging needs of devices waiting to be charged, such as pulse laser power supplies, to ensure the safety and stability of the devices to be charged, and has the value of promotion and application.

[0021] 2) The pulse laser power supply system in the present invention can limit the two currents flowing through the first main discharge switch and the second main discharge switch through the current-sharing effect of the coupled current-sharing inductor, ensure that the currents flowing through the two main discharge switches are the same, and avoid damaging the main discharge switch of the circuit due to excessive current in one of the circuits. At the same time, through the effect of the coupled current-sharing inductor, the conduction time of the main discharge switch is accelerated, and the consistency of the conduction time of the two main discharge switches is improved, thereby improving the output energy consistency of the pulse laser power supply. At the same time, the main charging unit in the present invention adopts a dual-circuit output design, which reduces the voltage stress borne by the single-circuit device during the operation of the main charging unit, is conducive to improving the working life of each device, thereby improving the reliability of the main charging unit, and when a circuit of the main charging unit fails, another normal circuit is used to derate to charge the main energy storage unit, so that the pulse laser power supply can operate at a reduced rate in the event of a fault, which is more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a circuit principle block diagram of the charging unit in Example 1;

[0023] Figure 2 is a circuit principle block diagram of the charging unit in Example 2;

[0024] Figure 3 is a circuit schematic diagram of the pulse laser power supply system in Example 3;

[0025] Figure 4 is a schematic diagram of the layout of the pulse laser power supply system in Example 3;

[0026] Figure 5 is a schematic diagram of the layout of the pre-charging unit in Example 3;

[0027] Figure 6 It is a schematic diagram of the layout of the main charging unit in Example 3. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0029] Example:

[0030] This embodiment discloses a charging unit, such as Figure 1 As shown, it includes a charging extension, a high-frequency voltage conversion circuit, a charging protection circuit and a high-voltage voltage divider circuit; the high-frequency voltage conversion circuit includes a high-frequency transformer and a power conversion circuit, the two output ends of the charging extension are respectively connected to the two ends of the primary coil of the high-frequency transformer, the two ends of the secondary coil of the high-frequency transformer are respectively connected to the two input ends of the power conversion circuit, the high-voltage output end of the power conversion circuit is connected to the charging protection circuit and serves as the high-voltage output end of the charging unit, the negative electrode of the power conversion circuit serves as the low-voltage output end of the charging unit, the low-voltage output end of the charging unit is grounded, and the two ends of the high-voltage voltage divider circuit are respectively connected to the high-voltage output end of the charging unit and the low-voltage output end of the charging unit.

[0031] The charging unit in this embodiment has high reliability, which can help improve the stability and reliability of devices waiting to be charged, such as pulse laser power supply systems. Specifically, in this embodiment, the high-frequency transformer in the high-frequency transformer circuit is used to reduce or increase the power output of the charging extension to change the output power voltage of the charging extension, and the power conversion circuit is used to convert the AC power output by the high-frequency transformer into DC power; the charging protection circuit can protect the high-frequency transformer circuit to prevent it from being affected by reverse voltage; the high-voltage voltage divider circuit is used to reduce the high voltage output by the high-voltage output end of the charging unit to a suitable value to meet the charging needs of devices waiting to be charged, such as pulse laser power supplies, to ensure the safety and stability of the devices to be charged, and has the value of promotion and application.

[0032] In this embodiment, the charging protection circuit includes a first resistor R1, a second resistor R2 and a freewheeling high-voltage silicon stack D T The high-voltage output end of the power conversion circuit is connected to the first resistor R1 and the second resistor R2 in sequence as the high-voltage output end of the charging unit, that is, one end of the second resistor R2 is connected to the first resistor R1, and the other end of the second resistor R2 is used as the high-voltage output end of the charging unit. The freewheeling high-voltage silicon stack D T The negative electrode is connected to the junction of the first resistor R1 and the second resistor R2, and the freewheeling high-voltage silicon stack D T The positive electrode of is connected to the negative electrode of the power conversion circuit. Specifically, in this embodiment, the first resistor R1 and the second resistor R are both high-power resistors. It should be noted that, in this embodiment, the setting of the charging protection circuit can protect the power conversion circuit in the high-frequency transformer circuit by providing a freewheeling loop to avoid it being affected by reverse voltage.

[0033] In this embodiment, the high voltage divider circuit includes a first voltage divider resistor R H and the second voltage divider resistor R L , the first voltage dividing resistor R H The resistance value is greater than the second voltage divider resistor R L The resistance value of the first voltage divider resistor R H One end of the first voltage-dividing resistor R H The other end of the resistor R L It is connected to the low voltage output terminal of the charging unit. It should be noted that, in this embodiment, the high voltage divider circuit adopts a high-precision voltage divider and uses differential signal output, which can improve output accuracy and anti-interference ability.

[0034] In this embodiment, the power conversion circuit adopts a full-bridge rectifier circuit, which includes a first high-voltage silicon stack D1, a second high-voltage silicon stack D2, a third high-voltage silicon stack D3 and a fourth high-voltage silicon stack D4. The cathode of the first high-voltage silicon stack D1 is connected to the cathode of the second high-voltage silicon stack D2, the anode of the first high-voltage silicon stack D1 is connected to the cathode of the third high-voltage silicon stack D3, the anode of the second high-voltage silicon stack D2 is connected to the cathode of the fourth high-voltage silicon stack D4, the anode of the third high-voltage silicon stack D3 is connected to the anode of the fourth high-voltage silicon stack D4, the junction point of the first high-voltage silicon stack D1 and the third high-voltage silicon stack D3, and the junction point of the second high-voltage silicon stack D2 and the fourth high-voltage silicon stack D4 are two input ends of the power conversion circuit, the junction point of the first high-voltage silicon stack D1 and the second high-voltage silicon stack D2 is the high-voltage output end of the power conversion circuit, and the junction point of the third high-voltage silicon stack D3 and the fourth high-voltage silicon stack D4 is the low-voltage output end of the power conversion circuit.

[0035] It should be noted that compared with other power conversion circuits, the full-bridge rectifier circuit has the advantages of high efficiency and stable output current. Specifically, the full-bridge rectifier circuit can utilize the coupling effect of the high-frequency transformer to use both half cycles of the charging extension power supply voltage for charging, thereby making fuller use of the power supply energy and improving the conversion efficiency. At the same time, the full-bridge rectifier circuit uses four diodes for rectification, which can smoothly convert the AC output of the power supply into DC output, reduce output ripple and noise, and improve the overall stability of the charging unit circuit.

[0036] In this embodiment, the charging unit further includes a current detection resistor R I , the current detection resistor R I The two current detection terminals of the charging extension are connected in series with the negative electrode of the power conversion circuit, and the two current detection terminals of the charging extension are connected to the current detection resistor R I The two ends of the charging extension are connected, and the voltage detection end of the charging extension is connected to the high-voltage voltage divider circuit. Specifically, in this embodiment, the voltage detection end of the charging extension is connected to the first voltage divider resistor R in the high-voltage voltage divider circuit. H and the second voltage dividing resistor R L The junction points are connected.

[0037] In this embodiment, the charging extension detects the first voltage-dividing resistor R in the high-voltage voltage-dividing circuit. H and the second voltage dividing resistor R L The voltage division realizes the detection of the output voltage of the charging unit. The charging extension detects the current detection resistor R I The output current of the charging unit is detected by measuring the voltage at both ends of the charging unit.

[0038] Embodiment 2:

[0039] In order to expand the charging range of the charging unit, based on Example 1, this embodiment provides another implementation of the charging unit. Specifically, Figure 2 As shown, in this embodiment, two groups of high-frequency transformer circuits are provided, and correspondingly, the charging extension is provided with two groups of output terminals, each group of output terminals is provided with two, and the two groups of output terminals are respectively connected to the two groups of high-frequency transformer circuits. Correspondingly, a third resistor R3 connected to the junction of the first resistor R1 and the second resistor R2 is provided in the charging protection circuit, and the high-voltage output terminal of the power conversion circuit in the two high-frequency transformer circuits outputs two high-voltage output terminals (OUT1+, OUT2+) respectively through the charging protection circuit, that is, the two high-voltage output terminals of the charging unit are output through the second resistor R2 and the third resistor R3 respectively, so as to provide two-way power supply support.

[0040] In this embodiment, two completely independent resonant circuits are used to achieve two outputs, thereby reducing the current and voltage stress received by the device in a single circuit and improving the reliability of the device. At the same time, when a certain output circuit fails, the other circuit can be derated to charge the subsequent energy storage capacitor, which can help improve the reliability of sources such as pulsed laser power supplies waiting for charging.

[0041] Furthermore, in this embodiment, the charging unit further includes a resonant circuit disposed between the charging extension and the high-frequency transformer circuit, and the resonant circuit includes a resonant inductor (L r1 , L r2 ) and resonant capacitor (C r1 , C r2 ), wherein one output end of the charging extension is connected to one end of the primary coil of the high-frequency transformer through the resonant inductor, and the other output end of the charging extension is connected to the other end of the primary coil of the high-frequency transformer through the resonant capacitor. The setting of the resonant circuit can achieve high-efficiency conversion and automatic control of the charging unit through the resonance phenomenon.

[0042] Furthermore, in this embodiment, the charging unit further includes an isolated high-voltage silicon stack (D O1 , D O2 ) to achieve electrical isolation between the charging unit and the device to be charged, such as a pulsed laser power supply, thereby ensuring the safety and reliability of the charging unit and the device to be charged.

[0043] Embodiment 3:

[0044] This embodiment discloses a pulse laser power supply system, such as Figure 3As shown, it includes a charging unit as described in any one of Examples 1 to 2, and the charging unit is provided with two, the two charging units are divided into a main charging unit and a pre-charging unit, and the main charging unit is provided with two high-voltage output terminals; the pulse laser power supply system also includes a control unit, a main energy storage unit group, a main discharge switch, a coupled current-sharing inductor, a wave modulation inductor, a pre-energy storage unit and a pre-discharge switch, the main discharge switch is divided into a first main discharge switch and a second main discharge switch, and the main energy storage unit group is divided into a first main energy storage unit group and a second main energy storage unit group; the control unit is connected to the communication interface of the main charging unit through an optical fiber, and is used to provide an optical fiber serial port communication signal to the main charging unit; the two high-voltage output terminals of the main charging unit are respectively connected to the high-voltage end of the first main energy storage unit group and the second main energy storage unit group The high-voltage end of the first main energy storage unit group is connected, the low-voltage output end of the main charging unit is single-point grounded, the high-voltage end of the first main energy storage unit group is also connected to the anode of the first main discharge switch, the high-voltage end of the second main energy storage unit group is also connected to the anode of the second main discharge switch, and the low-voltage end of the first main energy storage unit group and the low-voltage end of the second main energy storage unit group are both grounded; the cathode of the first main discharge switch and the cathode of the second main discharge switch are both connected to one end of the modulation inductor through the coupled current-sharing inductor, and the other end of the modulation inductor is connected to the xenon lamp load as the output end of the pulse laser power supply system; the control unit is also connected to the trigger input interface of the first main discharge switch and the second main discharge switch through an optical fiber, and is used to send an optical fiber synchronization trigger signal to the first main discharge switch and the second main discharge switch;

[0045] The control unit is connected to the communication interface of the pre-charging unit through an optical fiber, and is used to provide an optical fiber serial port communication signal to the pre-charging unit; the high-voltage output end of the pre-charging unit is connected to the high-voltage end of the pre-energy storage unit, and the low-voltage output end of the pre-charging unit is single-point grounded; the high-voltage end of the pre-energy storage unit is connected to the anode of the pre-discharge switch, the low-voltage end of the pre-energy storage unit is grounded, and the cathode of the pre-discharge switch is connected to the wave modulation inductor; the control unit is also connected to the trigger input interface of the pre-discharge switch through an optical fiber, and is used to send an optical fiber synchronization trigger signal to the pre-discharge switch.

[0046] In this embodiment, the number of main energy storage units in the first main energy storage unit group and the second main energy storage unit group is the same, which is n / 2, where n is an even number greater than 2. In this embodiment, a typical value of n is 12.

[0047] In this embodiment, the coupled current-sharing inductor is composed of two groups of inductor coils wound in opposite directions, and the output ends of the two groups of inductor coils are connected to the modulating inductor through the busbar. Specifically, in this embodiment, the modulating inductor is provided with m, m is an integer greater than 1, the input ends of the m modulating inductors are connected to the busbar, and the output ends of the m modulating inductors are connected to the coaxial discharge cable as the m-way output ends of the pulsed laser power supply system. In this embodiment, the typical value of m is 20.

[0048] In this embodiment, the modulation inductor is used to adjust the peak value and pulse width of the output discharge current waveform. By adjusting the parameters of the modulation inductor, the output parameters of the pulse laser power supply can meet different requirements, and the xenon lamp load can work in a near-critical damping state. At the same time, the parameters of the m-circuit modulation inductors must be kept consistent to ensure that the m-circuit output parameters of the pulse laser power supply are consistent.

[0049] This embodiment limits the two currents flowing through the first main discharge switch and the second main discharge switch by coupling the current-sharing inductor to ensure that the currents flowing through the two main discharge switches are the same, avoiding damage to the main discharge switch of the circuit due to excessive current in one of the circuits, and at the same time, by coupling the current-sharing inductor, speeds up the on-time of the main discharge switch, improves the consistency of the on-time of the two main discharge switches, and thus improves the output energy consistency of the pulse laser power supply. At the same time, the main charging unit in this embodiment adopts a dual-circuit output design, which reduces the voltage stress borne by the single-circuit device during the operation of the main charging unit, is conducive to improving the working life of each device, thereby improving the reliability of the main charging unit, and when one circuit of the main charging unit fails, another normal circuit is used to derate to charge the main energy storage unit, so that the pulse laser power supply can be operated at a reduced rate in the event of a fault, which is more economical.

[0050] Specifically, in the present embodiment, the first main energy storage unit group and the second main energy storage unit group both include a plurality of main energy storage units connected in parallel, and the number of energy storage units in the first main energy storage unit group and the second main energy storage unit group should be set to be consistent, both being n / 2, and symmetrically arranged in the pulse laser power supply to ensure that the electromagnetic fields generated by the first main energy storage unit group and the second main energy storage unit group during the discharge process are equal in magnitude and opposite in direction, thereby minimizing the electromagnetic field generated by the main energy storage unit.

[0051] In this embodiment, the first main energy storage unit group and the second main energy storage unit group both include multiple main energy storage units; the main energy storage unit includes a main capacitor and a protective inductor, the negative electrode of the main capacitor is grounded as the low-voltage end of the main energy storage unit, the positive electrode of the main capacitor is connected to the input end of the protective inductor, and the output end of the protective inductor is connected to the main charging unit and the corresponding main discharge switch as the high-voltage end of the main energy storage unit. It should be noted that in this embodiment, the main capacitor is used to store energy, and the protective inductor is used to absorb the backflow energy of the remaining normal capacitors to the main capacitor after the main capacitor is broken down due to an internal short circuit fault, so as to avoid the explosion of the faulty capacitor due to excessive backflow energy. It should also be noted that in this embodiment, the output ends of the multiple protective inductors (protective inductor 1, ... protective inductor n / 2) in the first main energy storage unit group jointly constitute the high-voltage end of the first main energy storage unit group, and the output ends of the multiple protective inductors (protective inductor n / 2+1, ... protective inductor n) in the second main energy storage unit group jointly constitute the high-voltage end of the second main energy storage unit group.

[0052] In this embodiment, the protection inductor is formed by connecting an inductor and a resistor in series, and is generally wound with a metal material with high resistivity.

[0053] In this embodiment, the first main discharge switch, the second main discharge switch and the pre-discharge switch are all semiconductor controlled silicon thyristor discharge switches.

[0054] It should be noted that the use of semiconductor thyristor discharge switches as the first main discharge switch, the second main discharge switch and the pre-discharge switch in the pulse laser power supply can reduce the complexity of the trigger control circuit, reduce the volume occupied by the switch part, provide space for the miniaturization design of the pulse laser power supply, and at the same time improve the maintainability of the discharge switch.

[0055] In this embodiment, the main charging unit has two output ends with equal currents, which are respectively connected to the high-voltage ends of the first main energy storage unit group and the second main energy storage unit group. The two outputs of the main charging unit are completely isolated and have complementary influences. When one of the outputs fails, the first main energy storage unit group and the second main energy storage unit group can also be charged and stored by operating the other output at a reduced rate.

[0056] In this embodiment, the pre-energy storage unit includes a pre-capacitor and a pre-ionization inductor, the negative electrode of the pre-capacitor is grounded as the low-voltage end of the pre-energy storage unit, the positive electrode of the pre-capacitor is connected to the input end of the pre-ionization inductor, and the output end of the pre-ionization inductor is connected to the pre-charging unit and the pre-discharge switch as the high-voltage end of the pre-energy storage unit. It should be noted that in this embodiment, the pre-capacitor is used to store pre-ionization energy, and the pre-ionization inductor is used to absorb the backflow energy of the main discharge circuit when the pre-discharge switch is short-circuited.

[0057] In this embodiment, the pre-ionization inductor is also formed by a series connection of an inductor and a resistor, which is generally wound with a metal material with high resistivity.

[0058] The main capacitor and the pre-capacitor are both metallized film self-healing capacitors.

[0059] In this embodiment, the pulsed laser power supply system further includes a diagnostic unit and a CT coil, which is used to provide an optical fiber serial communication signal to the diagnostic unit; the control unit is connected to the communication interface of the diagnostic unit via an optical fiber, and the CT coil is sleeved on a discharge cable connected to the other end of the modulated inductor to transmit the induced discharge current signal to the diagnostic unit. Specifically, the CT coil measures the discharge current of each circuit xenon lamp load by measuring the current at the negative end of the discharge cable. In this embodiment, the CT coil is set corresponding to the number of modulated inductors, and m are also set.

[0060] In this embodiment, the CT coil adopts the PCB differential Rogowski coil technology solution.

[0061] In this embodiment, the discharge current waveform of the pulse laser power supply can be quickly collected and diagnosed through the CT coil and the diagnostic unit, providing a basis for judging the discharge state of the pulse laser power supply, so as to improve the availability of the pulse laser power supply in this embodiment.

[0062] In this embodiment, the number of main energy storage units in the first main energy storage unit group and the second main energy storage unit group is the same, both are 6; there are 20 wave modulation inductors, the input ends of the 20 wave modulation inductors are all connected to the coupled current sharing inductor, and the output ends of the 20 wave modulation inductors are connected to the coaxial discharge cable as the 20 output ends of the pulsed laser power supply system.

[0063] In this embodiment, the pulse laser power supply host computer control software controls the main charging unit and the pre-charging unit through the control unit to charge and store energy in the capacitors of the main energy storage unit and the pre-energy storage unit respectively. When the charging voltage of the main capacitor and the pre-capacitor reaches the set value (such as the maximum voltage of the main capacitor is 31kV, and the maximum voltage of the pre-capacitor is 28kV), the main charging unit and the pre-charging unit are controlled to stop charging, and the control unit sends a pre-trigger signal and a main trigger signal to the pre-discharge switch and the main discharge switch in sequence (the pre-trigger signal needs to be sent 250 to 300μS in advance of the main trigger signal, a typical value is 250μS, and the trigger signals input to the first main discharge switch K1 and the second main discharge switch K2 must be completely synchronized). After the pre-discharge switch is turned on, the energy stored in the pre-capacitor reaches the busbar through the pre-ionization inductor YBL, the pre-ionization inductor YBR and the pre-discharge switch K3 in sequence, and then reaches the xenon lamp load through m-way modulated inductors and m discharge cables in sequence, so that the xenon lamp load is pre-ionized. After the pre-discharge is completed, the main trigger signal turns on the first main discharge switch K1 and the second main discharge switch K2, and the energy stored in the main capacitor reaches the two input ends of the coupled current-sharing inductor Lo through the protective inductor BL, the protective inductor BR, the first main discharge switch K1, and the second main discharge switch K2 in turn. The output end of the coupled current-sharing inductor Lo gathers the energy of the two branches together and outputs it to the busbar, and then reaches the xenon lamp load through m-way modulated inductors and m discharge cables in turn, so that the xenon lamp completes the main discharge. During the discharge process, the diagnostic unit synchronously collects and records the discharge current of the m-way xenon lamp through the m-way CT coils. After the main discharge is completed, the control unit can read the discharge current waveform of the m-way xenon lamp load collected by the diagnostic unit to determine whether the discharge of the xenon lamp load in each circuit is normal.

[0064] In addition, if Figure 4 As shown, in this embodiment, a modular design scheme is adopted to divide the pulse laser power supply circuit into different modules according to function, and a metal cabinet and a metal box are used to divide the modules into different modules according to high voltage, control and function, and the interface is standardized in design, and optical fiber signals are used as much as possible to replace the transmission of electrical signals, thereby reducing the electromagnetic interference of high-voltage discharge on the control part and the electromagnetic interference of the charging part on the monitoring part, thereby improving the overall stability and reliability of the pulse laser power supply circuit, and greatly improving the efficiency during the installation process and the convenience of later maintenance.

[0065] Specifically, in this embodiment, the first main energy storage unit group, the second main energy storage unit group, the pre-energy storage unit, the first main discharge switch K1, the second main discharge switch K2, the pre-discharge switch K3, the coupled current-sharing inductor Lo, the busbar, and the m-way wave-modulation inductor are arranged together to form a high-voltage cabinet, which is encapsulated by an explosion-proof metal cabinet and is arranged as symmetrically as possible. The layout diagram is shown in FIG. Figure 4The control unit, diagnostic unit, main charging unit, and pre-charging unit are each packaged in a metal box and together form a low-voltage cabinet, which is packaged by two metal cabinets. The layout diagram is shown in the figure. Figure 4 The low pressure part.

[0066] Furthermore, if Figure 5 and Figure 6 As shown, in this embodiment, in order to improve the overall reliability of the main charging unit and the pre-charging unit, we adopt a modular design to separately set the main charging unit and the pre-charging unit in an independent chassis or cabinet, so as to ensure the independence of the main charging unit and the pre-charging unit and prevent interference from other parts from affecting the normal operation of the main charging unit and the pre-charging unit. The modular design scheme also facilitates overall replacement during maintenance, making maintenance more convenient.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A charging unit, characterized in that: It includes a charging extension, a high-frequency voltage conversion circuit, a charging protection circuit and a high-voltage voltage divider circuit; the high-frequency voltage conversion circuit includes a high-frequency transformer and a power conversion circuit, the two output ends of the charging extension are respectively connected to the two ends of the primary coil of the high-frequency transformer, the two ends of the secondary coil of the high-frequency transformer are respectively connected to the two input ends of the power conversion circuit, the high-voltage output end of the power conversion circuit is connected to the charging protection circuit and serves as the high-voltage output end of the charging unit, the negative pole of the power conversion circuit serves as the low-voltage output end of the charging unit, and the two ends of the high-voltage voltage divider circuit are respectively connected to the high-voltage output end of the charging unit and the low-voltage output end of the charging unit.

2. A charging unit according to claim 1, characterized in that: The charging protection circuit includes a first resistor, a second resistor and a freewheeling high-voltage silicon stack. The high-voltage output end of the power conversion circuit is connected to the first resistor and the second resistor in sequence and serves as the high-voltage output end of the charging unit. The negative electrode of the freewheeling high-voltage silicon stack is connected to the junction of the first resistor and the second resistor, and the positive electrode of the freewheeling high-voltage silicon stack is connected to the negative electrode of the power conversion circuit.

3. A charging unit according to claim 1, characterized in that: The high-voltage voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, the resistance of the first voltage-dividing resistor is greater than the resistance of the second voltage-dividing resistor, one end of the first voltage-dividing resistor is connected to the high-voltage output end of the charging unit, and the other end of the first voltage-dividing resistor is connected to the low-voltage output end of the charging unit through the second voltage-dividing resistor.

4. A charging unit according to claim 1, characterized in that: The power conversion circuit adopts a full-bridge rectifier circuit, which includes a first high-voltage silicon stack, a second high-voltage silicon stack, a third high-voltage silicon stack and a fourth high-voltage silicon stack. The cathode of the first high-voltage silicon stack is connected to the cathode of the second high-voltage silicon stack, the anode of the first high-voltage silicon stack is connected to the cathode of the third high-voltage silicon stack, the anode of the second high-voltage silicon stack is connected to the cathode of the fourth high-voltage silicon stack, the anode of the third high-voltage silicon stack is connected to the anode of the fourth high-voltage silicon stack, the junction point of the first high-voltage silicon stack and the third high-voltage silicon stack, and the junction point of the second high-voltage silicon stack and the fourth high-voltage silicon stack are two input ends of the power conversion circuit, the junction point of the first high-voltage silicon stack and the second high-voltage silicon stack is the high-voltage output end of the power conversion circuit, and the junction point of the third high-voltage silicon stack and the fourth high-voltage silicon stack is the low-voltage output end of the power conversion circuit.

5. A charging unit according to claim 1, characterized in that: The charging unit also includes a current detection resistor, which is connected in series to the negative electrode of the power conversion circuit. The two current detection terminals of the charging extension are respectively connected to the two ends of the current detection resistor, and the voltage detection terminal of the charging extension is connected to the high-voltage voltage divider circuit.

6. A pulse laser power supply system, characterized in that: The invention comprises a charging unit as claimed in any one of claims 1 to 5, and two charging units are provided, the two charging units are divided into a main charging unit and a pre-charging unit, and the main charging unit is provided with two high-voltage output terminals; the pulse laser power supply system also comprises a control unit, a main energy storage unit group, a main discharge switch, a coupled current-sharing inductor, a wave modulation inductor, a pre-energy storage unit and a pre-discharge switch, the main discharge switch is divided into a first main discharge switch and a second main discharge switch, and the main energy storage unit group is divided into a first main energy storage unit group and a second main energy storage unit group; the control unit is connected to the communication interface of the main charging unit through an optical fiber; the two high-voltage output terminals of the main charging unit are respectively connected to the high-voltage terminal of the first main energy storage unit group and the first main energy storage unit group. The high-voltage ends of the two main energy storage unit groups are connected, the low-voltage output end of the main charging unit is single-point grounded, the high-voltage end of the first main energy storage unit group is also connected to the anode of the first main discharge switch, the high-voltage end of the second main energy storage unit group is also connected to the anode of the second main discharge switch, and the low-voltage ends of the first main energy storage unit group and the second main energy storage unit group are both grounded; the cathode of the first main discharge switch and the cathode of the second main discharge switch are both connected to one end of the modulation inductor through the coupled current-sharing inductor, and the other end of the modulation inductor serves as the output end of the pulse laser power supply system; the control unit is also connected to the trigger input interface of the first main discharge switch and the second main discharge switch through an optical fiber; The control unit is connected to the communication interface of the pre-charging unit through an optical fiber; the high-voltage output end of the pre-charging unit is connected to the high-voltage end of the pre-energy storage unit, and the low-voltage output end of the pre-charging unit is single-point grounded; the high-voltage end of the pre-energy storage unit is connected to the anode of the pre-discharge switch, the low-voltage end of the pre-energy storage unit is grounded, and the cathode of the pre-discharge switch is connected to the modulation inductor; the control unit is also connected to the trigger input interface of the pre-discharge switch through an optical fiber.

7. A pulse laser power supply system according to claim 6, characterized in that: The first main energy storage unit group and the second main energy storage unit group each include a plurality of main energy storage units; the main energy storage unit includes a main capacitor and a protective inductor, the negative electrode of the main capacitor is grounded as the low-voltage end of the main energy storage unit, the positive electrode of the main capacitor is connected to the input end of the protective inductor, and the output end of the protective inductor serves as the high-voltage end of the main energy storage unit.

8. A pulse laser power supply system according to claim 7, characterized in that: The first main discharge switch, the second main discharge switch and the pre-discharge switch are all semiconductor controlled silicon thyristor discharge switches.

9. A pulse laser power supply system according to claim 7, characterized in that: The pre-energy storage unit includes a pre-capacitor and a pre-ionization inductor. The negative electrode of the pre-capacitor is grounded as the low-voltage end of the pre-energy storage unit, the positive electrode of the pre-capacitor is connected to the input end of the pre-ionization inductor, and the output end of the pre-ionization inductor serves as the high-voltage end of the pre-energy storage unit.

10. A pulse laser power supply system according to claim 6, characterized in that: The number of main energy storage units in the first main energy storage unit group and the second main energy storage unit group is the same, both are 6; there are 20 wave modulation inductors, the input ends of the 20 wave modulation inductors are all connected to the coupled current sharing inductor, and the output ends of the 20 wave modulation inductors are connected to the coaxial discharge cable as the 20 output ends of the pulsed laser power supply system.

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