High-voltage pulse generating circuit and starting system of laser

Abstract

The utility model relates to a high-voltage pulse generating circuit and a starting system of a laser. The circuit comprises a voltage dividing unit, a voltage stabilizing unit, a photoelectric coupling assembly, a first capacitor, a thyristor and a transformer. The first end of the voltage dividing unit is used for accessing power supply voltage, and the second end of the voltage dividing unit is connected with the first end of the voltage stabilizing unit, the first end of the first capacitor and the anode of the thyristor; the second end of the voltage stabilizing unit is connected with the first output end of the photoelectric coupling assembly, and the third end of the voltage stabilizing unit is grounded. A first input end and a second input end of the photoelectric coupling component are used for accessing a driving pulse signal, and a second output end of the photoelectric coupling component is connected with a control electrode of the thyristor; the cathode of the thyristor is connected with the first end of a primary side coil of the transformer, the second end of the primary side coil of the transformer is connected with the second end of the first capacitor and grounded, and a secondary side coil of the transformer is used for being connected with a device to be triggered. By adopting the method, the circuit structure and the control complexity can be simplified while the circuit effect is maintained.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a high-voltage pulse generating circuit and a laser starting system. Background Art

[0002] In traditional technology, in order to prevent mutual interference between various circuits in the overall system, a separate power supply is often connected to the high-voltage pulse generating circuit. For example, in a traditional laser, the high-voltage pulse generating circuit of a xenon lamp needs to be configured with a separate power supply, which is powered separately from the power supply of the single-chip microcomputer control circuit of the main control circuit. However, if a separate power supply is configured for the high-voltage pulse generating circuit, this increases the complexity and cost of the circuit. In the field of lasers, especially medical lasers, it will increase the size of the laser, the complexity of control, etc., thereby affecting the use effect. Utility Model Content

[0003] Based on this, it is necessary to provide a high-voltage pulse generating circuit that can reduce circuit complexity and simplify control complexity in response to the above technical problems.

[0004] In a first aspect, a high-voltage pulse generating circuit is provided, the circuit comprising a voltage dividing unit, a voltage stabilizing unit, a photoelectric coupling component, a first capacitor, a thyristor and a transformer; wherein:

[0005] The first end of the voltage dividing unit is used to access the power supply voltage, and the second end of the voltage dividing unit is connected to the first end of the voltage stabilizing unit, the first end of the first capacitor and the anode of the thyristor;

[0006] The second end of the voltage stabilizing unit is connected to the first output end of the photoelectric coupling component, and the third end of the voltage stabilizing unit is grounded;

[0007] The first input terminal and the second input terminal of the photoelectric coupling component are used to access the driving pulse signal, and the second output terminal of the photoelectric coupling component is connected to the control electrode of the thyristor; and

[0008] The cathode of the thyristor is connected to the first end of the primary coil of the transformer, the second end of the primary coil of the transformer is connected to the second end of the first capacitor and grounded, and the secondary coil of the transformer is used to connect the device to be triggered.

[0009] In some embodiments, the voltage dividing unit includes at least one voltage dividing element, the voltage dividing element includes voltage dividing resistors, and the voltage dividing resistors are connected in series.

[0010] In some embodiments, the voltage regulator unit includes a first voltage regulator tube unit, a second voltage regulator tube and a second capacitor; wherein the first voltage regulator tube unit includes a plurality of sub-voltage regulator tubes, each of which is connected in series, and the cathode of the first voltage regulator tube unit is connected to the second end of the voltage divider unit and the first end of the first capacitor; the anode of the first voltage regulator tube unit is connected to the first end of the second capacitor, the cathode of the second voltage regulator tube and the first output end of the optocoupler component; and the anode of the second voltage regulator tube is connected to the second end of the second capacitor and is grounded.

[0011] In some embodiments, the circuit also includes a pulse control unit; the pulse control unit includes a first resistor, a second resistor and a third capacitor; the first end of the first resistor is connected to the first end of the third capacitor and the second output end of the photoelectric coupling component; the second end of the first resistor is connected to the second end of the third capacitor, the first end of the second resistor and the control electrode of the thyristor; and the second end of the second resistor is connected to the third output end of the photoelectric coupling component.

[0012] In some embodiments, the circuit further includes a third resistor, a first end of the third resistor is connected to the second end of the voltage stabilizing unit, and a second end of the third resistor is connected to the first output end of the photoelectric coupling component.

[0013] In some embodiments, the photoelectric coupling component includes a light-emitting diode, a first photosensitive transistor and a second photosensitive transistor; wherein the anode and cathode of the light-emitting diode serve as the first input terminal and the second input terminal of the photoelectric coupling component respectively; the collector of the first photosensitive transistor is connected to the collector of the second photosensitive transistor as the first output terminal of the photoelectric coupling component; the emitter of the first photosensitive transistor is connected to the emitter of the second photosensitive transistor as the second output terminal of the photoelectric coupling component; and the base of the first photosensitive transistor serves as the third output terminal of the photoelectric coupling component.

[0014] In some embodiments, the circuit further includes a fourth resistor, a first end of the fourth resistor is connected to the first end of the first capacitor, and a second end of the fourth resistor is connected to the second end of the voltage dividing unit.

[0015] In some embodiments, the fourth resistor includes a plurality of sub-resistors connected in series.

[0016] In some embodiments, the circuit further includes a fifth resistor, a first end of the fifth resistor is used to connect to the drive control circuit, and a second end of the fifth resistor is connected to the first input end of the optocoupler component.

[0017] In a second aspect, a laser starting system is provided, comprising an energy storage capacitor network, a drive control circuit, a xenon lamp, and a high-voltage pulse generating circuit of any embodiment of the first aspect; wherein the drive control circuit is connected to a first input terminal and a second input terminal of a photoelectric coupling component of the high-voltage pulse generating circuit; the energy storage power supply network is connected to a first terminal and a ground wire of a voltage divider unit of the high-voltage pulse generating circuit; and the secondary coil of the transformer of the high-voltage pulse generating circuit is connected to the xenon lamp.

[0018] The above-mentioned high-voltage pulse generating circuit and laser starting system, the DC voltage of the main power supply input of the system to be started is connected to the first output end of the photoelectric coupling component after passing through the voltage dividing unit and the voltage stabilizing unit, so as to provide the photoelectric coupling component with a working voltage suitable for its operation, and on the other hand, it charges the first capacitor for energy storage after passing through the voltage dividing unit. After the first input end and the second input end of the photoelectric coupling component are connected to the driving pulse signal, a control pulse signal is generated from the second output end of the photoelectric coupling component, and the control pulse signal is input to the control stage of the thyristor to control the conduction of the thyristor, so that the first capacitor discharges the primary coil of the transformer, so that the secondary coil of the transformer generates a high-voltage pulse required to trigger the device to be triggered, thereby triggering the connected device to be triggered and realizing the startup of the system. In the present application, the power supply directly adopts the main power supply of the system to be started, and there is no need to provide additional power for the operation of the optocoupler component and the energy storage of the first capacitor. That is, the charging of the first capacitor and the working power supply of the optocoupler component are both taken from the DC voltage of the main power supply of the system to be started. Therefore, the AC rectifier circuit for providing the working power supply can be saved, making the circuit simple and reducing the cost; in addition, the generating part of the drive pulse signal (for example, the single-chip microcomputer control circuit) and the high-voltage pulse triggering part can be effectively isolated through the optocoupler component U1, thereby avoiding interference with the signal of the main control circuit (single-chip microcomputer control circuit), and providing a suitable voltage and control instructions for the thyristor, thereby realizing the use of the thyristor to control the discharge of the first capacitor to achieve the triggering of the triggering device, making the circuit control simple and reliable and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a high voltage pulse generating circuit in one or more embodiments;

[0020] Figure 2 A schematic block diagram of the structure of a laser starting system in one or more embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] The high-voltage pulse generating circuit of the present application can be applied to the starting system of a high-voltage gas discharge lamp, electrostatic precipitator equipment, ozone generator and other fields that require high-voltage pulse triggering, and can realize the function of high-voltage pulse output. Below, taking the high-voltage pulse generating circuit provided by the present application applied to the starting system of a laser as an example, the high-voltage pulse generating circuit of the present application is described in detail.

[0023] In some embodiments, reference Figure 1 As shown, a high-voltage pulse generating circuit 100 is provided, and the high-voltage pulse generating circuit 100 includes a voltage dividing unit 110, a voltage stabilizing unit 120, an optocoupler component U1, a first capacitor C1, a thyristor Q1 and a transformer T1; wherein,

[0024] The first end 1101 of the voltage dividing unit 110 is used to access the power supply voltage, and the second end of the voltage dividing unit 110 is connected to the first end 1201 of the voltage stabilizing unit 120, the first end of the first capacitor C1 and the anode of the thyristor Q1;

[0025] The second end 1202 of the voltage stabilizing unit 120 is connected to the first output end U1-5 of the photoelectric coupling component U1, and the third end 1203 of the voltage stabilizing unit 120 is grounded GND;

[0026] The first input terminal U1-1 and the second input terminal U1-2 of the photoelectric coupling component U1 are used to access the driving pulse signal, and the second output terminal U1-4 of the photoelectric coupling component U1 is connected to the control electrode Q1-3 of the thyristor Q1; and

[0027] The cathode of the thyristor Q1 is connected to the first end of the primary coil of the transformer T1, the second end of the primary coil of the transformer T1 is connected to the second end of the first capacitor C1 and grounded GND, and the secondary coil of the transformer T1 is used to connect the device to be triggered (not in Figure 1 As shown in FIG. 1 , for example, in a laser starting system, the device to be triggered may be a xenon lamp or the like.

[0028] Among them, the thyristor Q1 (Thyristor) is the abbreviation of thyristor, also known as silicon controlled rectifier (Silicon Controlled Rectifier, SCR, referred to as thyristor).

[0029] In the above-mentioned high-voltage pulse generating circuit 100, the DC voltage of the main power supply input of the system to be started (for example, a laser system) is connected to the first output terminal U1-5 of the photoelectric coupling component U1 after passing through the voltage dividing unit 110 and the voltage stabilizing unit 120, so as to provide the photoelectric coupling component U1 with a working voltage suitable for its operation. On the other hand, the DC voltage is charged and stored for the first capacitor C1 after passing through the voltage dividing unit 110. After the first input terminal U1-1 and the second input terminal U1-2 of the photoelectric coupling component U1 are connected to the driving pulse signal, a control pulse signal is generated from the second output terminal U1-4 of the photoelectric coupling component U1. The control pulse signal is input to the control stage Q1-3 of the thyristor Q1 to control the thyristor Q1 to be turned on, so that the first capacitor C1 discharges the primary coil of the transformer T1, so that the secondary coil of the transformer T1 generates a high-voltage pulse required to trigger the device to be triggered, thereby triggering the connected device to be triggered and realizing the startup of the system. The power supply of the high-voltage pulse generating circuit 100 of the present application directly adopts the main power supply of the system to be started, and there is no need to provide additional power for the operation of the optocoupler component U1 and the energy storage of the first capacitor C1. That is, the charging of the first capacitor C1 and the working power supply of the optocoupler component U1 are both taken from the DC voltage of the main power supply of the system to be started. Therefore, the AC rectifier circuit for providing the working power supply can be saved, making the circuit simple and reducing the cost; in addition, the generating part of the drive pulse signal (for example, the single-chip microcomputer control circuit) and the high-voltage pulse triggering part can be effectively isolated through the optocoupler component U1, thereby avoiding interference with the signal of the main control circuit (single-chip microcomputer control circuit), and providing a suitable voltage and control instructions for the thyristor Q1, thereby realizing the use of the thyristor Q1 to control the discharge of the first capacitor C1 to trigger the device to be triggered, making the circuit control simple, reliable and stable.

[0030] In some embodiments, the voltage dividing unit 110 includes at least one voltage dividing element, which may include a voltage dividing resistor, for example, Figure 1 R6 and R7 in the circuit, each voltage-dividing resistor R6, R7 can be connected in series. Of course, other components for voltage division and the like can also be included. By setting at least one voltage-dividing component, the DC voltage of the main power supply can be stepped down, thereby preliminarily adjusting the voltage supplied to the optocoupler component U1 and the first capacitor C1. The specific type and number of the voltage-dividing components can be adjusted according to demand.

[0031] In some embodiments, the voltage regulator unit 120 includes a first voltage regulator tube unit 1204, a second voltage regulator tube D2 and a second capacitor C2; wherein the first voltage regulator tube unit 1204 may include a plurality of sub-voltage regulator tubes D1 and D3, each of which may be connected in series, the cathode of the first voltage regulator tube unit 1204 is connected to the second end of the voltage divider unit 110 and the first end of the first capacitor C1; the anode of the first voltage regulator tube unit 1204 is connected to the first end of the second capacitor C2, the cathode of the second voltage regulator tube D2 and the first output end U1-5 of the optocoupler component U1; and the anode of the second voltage regulator tube D2 is connected to the second end of the second capacitor C2 and to the ground GND.

[0032] In this embodiment, by providing a voltage stabilizing unit 120, the voltage separated from the DC voltage of the main power supply is further stepped down and stabilized by multiple sub-stabilizing tubes D1 and D3 in the first voltage stabilizing tube unit 1204, and a stable "small power supply" is formed by the second capacitor C2 and the second voltage stabilizing tube D2 connected in parallel, wherein the second capacitor C2 is used for energy storage and the second voltage stabilizing tube D2 is used for voltage stabilization. The "small power supply" can provide the optoelectronic coupling component U1 with the stable working voltage required for its operation.

[0033] In some embodiments, the high-voltage pulse generating circuit 100 also includes a pulse control unit 130; the pulse control unit 130 includes a first resistor R1, a second resistor R2 and a third capacitor C3; the first end of the first resistor R1 is connected to the first end of the third capacitor C3 and the second output end U1-4 of the optocoupler component U1; the second end of the first resistor R1 is connected to the second end of the third capacitor C3, the first end of the second resistor R2 and the control electrode Q1-3 of the thyristor Q1; and the second end of the second resistor R2 is connected to the third output end U1-6 of the optocoupler component U1.

[0034] In this embodiment, the parallel connection of the first resistor R1 and the third capacitor C3 can play a role in current limiting filtering, and prevent the oscillation of the control pulse signal output from the second output terminal U1-4 of the optocoupler component U1, so that the waveform of the control pulse signal is maintained in an ideal waveform state of the turn-on thyristor Q1. In addition, through the second resistor R2 used for sampling, the sampling signal of the control stage (gate) of the thyristor Q1 can be fed back to the third output terminal U1-6 of the optocoupler component U1, thereby realizing positive feedback to enhance the leading edge peak of the control pulse signal output from the second output terminal U1-4 of the optocoupler component U1, that is, adjust the steepness of the rising edge of the control pulse signal, thereby accelerating the conduction and response speed of the thyristor Q1 and improving the startup speed of the system.

[0035] In some embodiments, the high voltage pulse generating circuit 100 further includes a third resistor R3, a first end of the third resistor R3 is connected to the second end 1202 of the voltage stabilizing unit 120, and a second end of the third resistor R3 is connected to the first output end U1-4 of the photoelectric coupling component U1. In this embodiment, a resistor element is provided between the first output end U1-4 of the photoelectric coupling component U1 and the second end 1202 of the voltage stabilizing unit 120, which can play a role of current limiting protection in practical applications.

[0036] In some embodiments, the photoelectric coupling component U1 includes a light-emitting diode, a first photosensitive transistor and a second photosensitive transistor; wherein the anode A (ANODE) ​​and the cathode C (CATHODE) of the light-emitting diode serve as the first input terminal U1-1 and the second input terminal U1-2 of the photoelectric coupling component U1 respectively; the collector C of the first photosensitive transistor is connected to the collector C (COLLECTOR) of the second photosensitive transistor as the first output terminal U1-5 of the photoelectric coupling component; the emitter E of the first photosensitive transistor is connected to the emitter E (EMITTER) of the second photosensitive transistor as the second output terminal U1-4 of the photoelectric coupling component; the base B (BASE) of the first photosensitive transistor serves as the third output terminal U1-6 of the photoelectric coupling component.

[0037] In this embodiment, the photoelectric coupling component U1 can adopt a 6-pin DIP (dual in-line package) general purpose photoelectric coupler (6-Pin DIP General Purpose Photodarlington Optocoupler). Of course, photoelectric couplers of other types or internal structures that can implement the solution of the present application are also included in the protection scope of the present application.

[0038] In some embodiments, the high voltage pulse generating circuit 100 further includes a fourth resistor R4, a first end of the fourth resistor R4 is connected to a first end of the first capacitor C1, and a second end of the fourth resistor R4 is connected to a second end of the voltage dividing unit 110 (ie, Figure 1 In the embodiment, a fourth resistor R4 is connected between the voltage dividing unit 110 and the first capacitor C1, and the fourth resistor R4 can be used to regulate the charging of the first capacitor C1. The first capacitor C1 can obtain the expected energy storage effect by controlling the resistance value of the fourth resistor R4.

[0039] In some embodiments, the fourth resistor R4 may include multiple sub-resistors connected in series, that is, the fourth resistor R4 with a larger resistance may be replaced by multiple sub-resistors with smaller resistances and a total resistance equal to the fourth resistor R4. By connecting multiple sub-resistors with smaller resistances in series, the heat dissipation can be improved.

[0040] In some embodiments, the high-voltage pulse generating circuit 100 further includes a fifth resistor R5, a first end of the fifth resistor R5 is used to connect to the drive control circuit 300, and a second end of the fifth resistor R5 is connected to the first input terminal U1-1 of the photoelectric coupling component U1. In this embodiment, by adding a resistor element between the drive control circuit 300 that sends the drive pulse signal and the first input terminal U1-1 of the photoelectric coupling component U1, the current limiting protection function can be achieved in practical applications.

[0041] In some embodiments, reference Figure 1 and Figure 2 As shown, Figure 2 The schematic structural block diagram of the laser starting system in some embodiments is shown. In this embodiment, the high voltage pulse generating circuit provided in the present application can be applied to the laser starting system.

[0042] Specifically, the starting system of the laser may include an energy storage capacitor network 200, a drive control circuit 300, a xenon lamp 400 and a high-voltage pulse generating circuit 100; wherein the drive control circuit 300 is connected to the first input terminal U1-1 and the second input terminal U1-2 of the optocoupler component U1 of the high-voltage pulse generating circuit 100; the energy storage power supply network 200 is connected to the first terminal 1101 and the ground wire GND of the voltage divider unit 110 of the high-voltage pulse generating circuit 100; and the secondary coil of the transformer T1 of the high-voltage pulse generating circuit 100 is connected to the xenon lamp 400.

[0043] More specifically, the connection between the high voltage pulse generating circuit 100 and the energy storage capacitor network 200 and the drive control circuit 300 can be achieved through a converter (such as Figure 1 Wherein, the drive control circuit 300 may be a single chip control circuit.

[0044] A laser starting system formed by applying the high-voltage pulse generating circuit 100 of one or more embodiments provided in the present application to a laser starting system can make the laser starting system structure simpler and lower in cost, and can generate a high-amplitude pulse voltage to speed up the starting of the system. For a detailed description of the specific structure and function of the laser starting system, please refer to the description of the corresponding structure and function of the high-voltage pulse generating circuit 100, which will not be repeated here.

[0045] Those skilled in the art will understand that Figure 2 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the scheme of the present application. The specific structure may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0046] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A high-voltage pulse generating circuit, the circuit comprising a voltage dividing unit, a voltage stabilizing unit, a photoelectric coupling component, a first capacitor, a thyristor and a transformer; wherein: The first end of the voltage dividing unit is used to access the power supply voltage, and the second end of the voltage dividing unit is connected to the first end of the voltage stabilizing unit, the first end of the first capacitor and the anode of the thyristor; The second end of the voltage stabilizing unit is connected to the first output end of the photoelectric coupling component, and the third end of the voltage stabilizing unit is grounded; The first input terminal and the second input terminal of the photoelectric coupling component are used to access the driving pulse signal, and the second output terminal of the photoelectric coupling component is connected to the control electrode of the thyristor; as well as The cathode of the thyristor is connected to the first end of the primary coil of the transformer, the second end of the primary coil of the transformer is connected to the second end of the first capacitor and grounded, and the secondary coil of the transformer is used to connect the device to be triggered.

2. The circuit according to claim 1, characterized in that The voltage dividing unit includes at least one voltage dividing element, and the voltage dividing element includes voltage dividing resistors, and each of the voltage dividing resistors is connected in series.

3. The circuit according to claim 1, characterized in that The voltage stabilizing unit includes a first voltage stabilizing tube unit, a second voltage stabilizing tube and a second capacitor; wherein, The first voltage regulator tube unit includes a plurality of sub-voltage regulator tubes, each of which is connected in series, and the cathode of the first voltage regulator tube unit is connected to the second end of the voltage dividing unit and the first end of the first capacitor; The anode of the first voltage regulator unit is connected to the first end of the second capacitor, the cathode of the second voltage regulator unit and the first output end of the photoelectric coupling component; and An anode of the second voltage regulator is connected to the second end of the second capacitor and is grounded.

4. The circuit according to claim 1, characterized in that The circuit further includes a pulse control unit; the pulse control unit includes a first resistor, a second resistor and a third capacitor; The first end of the first resistor is connected to the first end of the third capacitor and the second output end of the photoelectric coupling component; The second end of the first resistor is connected to the second end of the third capacitor, the first end of the second resistor and the control electrode of the thyristor; as well as The second end of the second resistor is connected to the third output end of the photoelectric coupling component.

5. The circuit according to claim 1, characterized in that The circuit further includes a third resistor, a first end of the third resistor is connected to the second end of the voltage stabilizing unit, and a second end of the third resistor is connected to the first output end of the photoelectric coupling component.

6. The circuit according to claim 4, characterized in that The photoelectric coupling component includes a light emitting diode, a first phototransistor and a second phototransistor; wherein, The anode and cathode of the light emitting diode serve as the first input terminal and the second input terminal of the photoelectric coupling component respectively; The collector of the first phototransistor is connected to the collector of the second phototransistor as the first output end of the photoelectric coupling component; The emitter of the first phototransistor is connected to the emitter of the second phototransistor as the second output end of the photoelectric coupling component; and The base of the first phototransistor serves as the third output terminal of the photoelectric coupling component.

7. The circuit according to claim 1, characterized in that The circuit further includes a fourth resistor, a first end of the fourth resistor is connected to the first end of the first capacitor, and a second end of the fourth resistor is connected to the second end of the voltage dividing unit.

8. The circuit according to claim 7, characterized in that The fourth resistor includes a plurality of sub-resistors connected in series.

9. The circuit according to claim 1, characterized in that The circuit further includes a fifth resistor, a first end of the fifth resistor is used to connect to the drive control circuit, and a second end of the fifth resistor is connected to the first input end of the photoelectric coupling component.

10. A laser starting system, comprising an energy storage capacitor network, a drive control circuit, a xenon lamp and a high voltage pulse generating circuit according to any one of claims 1 to 9; wherein: The drive control circuit is connected to the first input terminal and the second input terminal of the photoelectric coupling component of the high-voltage pulse generating circuit; The energy storage power supply network is connected to the first end of the voltage dividing unit of the high voltage pulse generating circuit and the ground line; and The secondary coil of the transformer of the high-voltage pulse generating circuit is connected to the xenon lamp.

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