Protection circuit, lamp pump charging circuit, and power supply system of solid-state laser

Abstract

The present application relates to a protection circuit, a lamp pump charging circuit and a power supply system of a solid-state laser. The protection circuit is applied to a lamp pump charging circuit of a power supply system of a solid-state laser, and comprises a charging and discharging regulation and control unit, a first logic unit and a second logic unit. A first end of the charging and discharging regulation and control unit is used for receiving an input signal; a second end of the charging and discharging regulation and control unit is grounded; a third end of the charging and discharging regulation and control unit is connected to a first input end of the first logic unit; a second input end of the first logic unit is connected to a power supply voltage; an output end of the first logic unit is connected to a first input end of the second logic unit; a second input end of the second logic unit is used for receiving the input signal; an output end of the second logic unit is used for outputting an output signal.

Description

Protection circuit, lamp pump charging circuit and power supply system of solid-state laser

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on September 4, 2023, with application number 2023111292341, and application name “Protection circuit, lamp pump charging circuit and power supply system for solid-state laser”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of solid-state lasers, and in particular to a protection circuit, a lamp pump charging circuit, and a power supply system for a solid-state laser. Background Art

[0004] With the development of solid-state laser technology, solid-state lasers have emerged. In the power supply system of solid-state lasers, large current and high voltage are required for the instantaneous discharge of xenon lamps, which are often provided by large-capacity energy storage capacitors. In order to protect the circuit, the energy storage capacitor charging circuit that charges the energy storage capacitor needs to be in a stopped state when the energy storage capacitor discharges the xenon lamp.

[0005] In traditional technology, the charging or discharging instructions for the energy storage capacitor are generally issued by a single-chip microcomputer. However, the inventors realized that the single-chip microcomputer may make errors when issuing instructions, which will cause the energy storage capacitor charging circuit to continue charging the energy storage capacitor when the energy storage capacitor charges the xenon lamp, thereby causing dangerous situations such as burning of the energy storage capacitor charging circuit.

[0006] Summary of the Invention

[0007] According to various embodiments of the present application, in a first aspect, a protection circuit is provided, which is applied to a lamp pump charging circuit of a power supply system of a solid-state laser, and includes a charge and discharge control unit, a first logic unit, and a second logic unit;

[0008] The first end of the charge and discharge control unit is used to receive an input signal, the second end of the charge and discharge control unit is grounded, the third end of the charge and discharge control unit is connected to the first input end of the first logic unit, the second input end of the first logic unit is connected to the power supply voltage, the output end of the first logic unit is connected to the first input end of the second logic unit, the second input end of the second logic unit is used to receive an input signal, and the output end of the second logic unit is used to output an output signal;

[0009] A first logic unit is used to perform a NOT operation on the level of an input signal and output the result;

[0010] The second logic unit is used to perform a NOT operation on the level of the input signal and then output the result;

[0011] a charge and discharge control unit, configured to, when the input signal is at the first level, cause the output signal at the output end of the second logic unit to change from the second level to the first level after the charge and discharge control unit completes charging;

[0012] The charge and discharge control unit is further configured to, when the input signal is at the second level, ensure that the output signal at the output end of the second logic unit remains at the first level after the charge and discharge control unit completes discharging.

[0013] In some embodiments, the protection circuit also includes a signal conversion unit, and the input signal includes a target input signal and an initial input signal; the first end of the signal conversion unit is used to access the initial input signal, and the second end of the signal conversion unit is connected to the first end of the charge and discharge control unit; the signal conversion unit is used to convert the initial input signal into a target input signal that matches the power supply system of the protection circuit, and maintain the consistency of the level attributes of the initial input signal and the target output signal.

[0014] In some embodiments, the charge and discharge control unit includes a capacitor element, a rectifier element and a resistor element; the first end of the resistor element is connected to the output end of the signal conversion unit, and the second end of the resistor element is connected to the first input end of the first logic unit; the negative end of the rectifier element is connected to the first end of the resistor element, and the positive end of the rectifier element is connected to the second end of the resistor element; the positive end of the capacitor element is connected to the second end of the resistor element, and the negative end of the capacitor element is grounded.

[0015] In some embodiments, the resistance of the resistor element is adjustable; and / or the capacitance of the capacitor element is adjustable.

[0016] In some embodiments, the signal conversion unit includes 2N NAND gate elements, or the signal conversion unit includes 2N NOT gate elements, where N is a positive integer.

[0017] In some embodiments, the first logic unit is configured as a NAND gate element, and the second logic unit is configured as a NAND gate element.

[0018] In some embodiments, the protection circuit further includes a level control unit; the level control unit is connected to the input end of the signal conversion unit, and the level control unit is used to control the protection circuit to be in a preset level state when no input signal is connected.

[0019] In some embodiments, the protection circuit further includes a switching circuit; the switching circuit includes a field effect transistor element, and the gate of the field effect transistor element is connected to the output signal, so that when the output signal is at a first level, the switching circuit is in an off state.

[0020] According to various embodiments of the present application, a lamp pump charging circuit is provided, comprising: a xenon lamp, an energy storage capacitor, an energy storage capacitor charging circuit, a single chip microcomputer, and a protection circuit according to any one of the embodiments of the first aspect; wherein,

[0021] The energy storage capacitor is used to provide energy to the xenon lamp when it discharges;

[0022] The single chip microcomputer is used to access the input signal for the protection circuit;

[0023] The energy storage capacitor charging circuit is used to charge the energy storage capacitor;

[0024] In the process of the energy storage capacitor discharging the xenon lamp to provide energy,

[0025] When the input signal is at the first level, the output signal of the protection circuit changes from the second level to the first level after the charging and discharging control unit completes charging, so that the energy storage capacitor charging circuit of the energy storage capacitor is in a disconnected state;

[0026] When the input signal is at the second level, the output signal of the protection circuit is still at the first level after the charging and discharging control unit completes charging, so that the energy storage capacitor charging circuit of the energy storage capacitor is in a disconnected state.

[0027] According to various embodiments of the present application, in a third aspect, a power supply system for a solid-state laser is provided, comprising the lamp pump charging circuit of the second aspect.

[0028] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] FIG1 is a diagram illustrating an application scenario of a protection circuit provided by the present application in some embodiments;

[0031] FIG2 is a schematic diagram of the structure of a protection circuit provided by the present application in some embodiments;

[0032] FIG3 is a schematic diagram of the structure of the protection circuit provided by the present application in some other embodiments;

[0033] FIG4 a is a schematic structural diagram of a protection circuit provided by the present application in yet other embodiments;

[0034] FIG4 b is a schematic structural diagram of a protection circuit provided by the present application in yet other embodiments;

[0035] FIG5 is a schematic structural diagram of a protection circuit provided by the present application in still other embodiments;

[0036] FIG6 is a schematic diagram of the structure of a lamp pump charging circuit provided by the present application in some embodiments. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0038] The following describes application scenarios of the protection circuits involved in the present application in some embodiments, with reference to FIG1 , which shows an application scenario diagram of the protection circuits provided in the present application in some embodiments.

[0039] In the lamp pump charging circuit 200 of the solid-state laser power supply system 100, the moment a lamp pump (e.g., a xenon lamp) discharges requires high current and high voltage. Energy is often supplied by a large-capacity energy storage capacitor. To protect the circuit, the energy storage capacitor charging circuit that charges the energy storage capacitor must be inactive when the energy storage capacitor discharges the xenon lamp. Discharge and charge instructions are typically issued by a single-chip microcontroller (MCU). However, if the MCU fails, the energy storage capacitor charging circuit may continue to charge, potentially burning out the circuit and causing other dangerous situations.

[0040] Therefore, the protection circuit 300 involved in the present application can be applied to the lamp pump charging circuit 200 of the power supply system 100 of the solid laser, and is used to ensure the safety of the energy storage capacitor charging circuit that charges the energy storage capacitor when the device providing charging and discharging instructions (for example, a single-chip microcomputer) fails, thereby preventing the energy storage capacitor charging circuit from burning out.

[0041] Next, the specific structure of the protection circuit is described in detail.

[0042] In some embodiments, referring to FIG2 , FIG2 shows a schematic diagram of the structure of the protection circuit provided by the present application in some embodiments, the protection circuit includes: a charge and discharge control unit 10, a first logic unit 20 and a second logic unit 30; wherein,

[0043] The first end 101 of the charge and discharge control unit is used to receive an input signal, the second end 102 of the charge and discharge control unit is grounded, the third end 103 of the charge and discharge control unit is connected to the first input end 201 of the first logic unit, the second input end 202 of the first logic unit is connected to the power supply voltage, the output end 203 of the first logic unit is connected to the first input end 301 of the second logic unit, the second input end 302 of the second logic unit is used to receive an input signal, and the output end 303 of the second logic unit is used to output an output signal.

[0044] The first logic unit 20 is used to perform a NOT operation on the level of the input signal and output the result;

[0045] The second logic unit 30 is used to perform a NOT operation on the level of the input signal and output the result;

[0046] The charge and discharge control unit 10 is configured to, when the input signal is at the first level, cause the output signal of the output terminal 303 of the second logic unit to change from the second level to the first level after the charge and discharge control unit 10 is charged;

[0047] The charge and discharge control unit 10 is further configured to, when the input signal is at the second level, ensure that the output signal of the output terminal 303 of the second logic unit remains at the first level after the charge and discharge control unit 10 completes discharging.

[0048] It can be seen from the above-mentioned embodiments that regardless of whether the input signal is at the first level or the second level, after passing through the protection circuit of the embodiment of the present application, the output signal is in the first level state. Only when the input signal is at the first level will the output signal briefly stay at the second level, and the time it stays at the second level depends on the charging time of the charge and discharge control unit. Therefore, the output signal can be corrected by controlling the charging time of the charge and discharge control unit so that regardless of whether the input signal is normal, the output signal can be maintained at an ideal level state, thereby protecting the safety of the subsequent circuit connected to the output signal.

[0049] For example, in the application scenario of Figure 1, if a device such as a single-chip microcomputer used to provide an input signal fails, that is, an input signal of the first level (charging instruction) is abnormally provided when an input signal of the second level (discharging instruction) should be provided, in this case, the protection circuit of the embodiment of the present application can adjust the output signal to the first level (the level that can cut off the energy storage capacitor charging circuit) regardless of the attribute of the input signal, that is, regardless of whether the input signal is correct or not. Even when the input signal of the first level (charging instruction) is abnormally provided, the output signal can be corrected to the first level (the level that can cut off the energy storage capacitor charging circuit) when the charging and discharging control unit is completed. Since this correction depends on the charging time of the charging and discharging control unit, the charging time of the charging and discharging control unit can be controlled, for example, to within tens of milliseconds. Therefore, when the input signal is abnormal, the output signal can be quickly corrected, thereby protecting the safety of the energy storage capacitor charging circuit in the lamp pump charging circuit of the power supply system of the solid-state laser.

[0050] Below, with reference to FIG. 2 , each unit of the protection circuit according to the embodiment of the present application will be described in more detail.

[0051] It can be understood that the first level refers to a high level, which can be expressed as 1, and the second level refers to a low level, which can be expressed as 0.

[0052] In one possible scenario, the NAND operation capability of the logic unit is explained as follows: since the second input terminal 202 of the first logic unit is connected to the supply voltage, the signal at the second input terminal 202 of the first logic unit is at a first level. Assuming that the signal at the first input terminal 201 of the first logic unit is at a second level, the first logic unit 20 is configured to first perform an AND operation on the first level signal at the second input terminal 202 and the second level signal at the first input terminal 201 to obtain a second level signal, then perform a NAND operation on the two signals to obtain a first level signal, and output the first level signal obtained after the NAND operation from the output terminal 203. The NAND operation capability of the second logic unit 30 is similar to that of the first logic unit and is not further described here.

[0053] In some embodiments, the first logic unit 20 and the second logic unit 30 can use NAND gate elements to implement NAND operation capabilities. Please refer to Figure 3, which is a structural schematic diagram of the protection circuit of other embodiments. Figure 3 shows the specific connection method when the first logic unit 20 and the second logic unit 30 are implemented by NAND gate elements.

[0054] In other embodiments, the first logic unit 20 and the second logic unit 30 may also use a combination of an AND gate element and a NOT gate element to implement the NAND operation capability. Of course, other possible logic elements capable of implementing NAND operation logic may also be selected.

[0055] 2 , the signal flow of the protection circuit according to the embodiment of the present application will be described in detail, starting from the case where the input signal is at the first level and the case where the input signal is at the second level.

[0056] When the input signal is at the first level, since the charge and discharge control unit 10 is in the waiting state and the second end 102 of the charge and discharge control unit is grounded, and the grounded end is at the second level, before the charge and discharge control unit 10 is fully charged, the signal output by the third end 103 of the charge and discharge control unit is at the second level, the first input end 201 of the first logic unit is also at the second level state 0, and the second input end 202 of the first logic unit is connected to the power supply voltage and is at the first level. Therefore, after the logic operation of the first logic unit, the signal output by the output end 203 of the first logic unit is at the first level. The signal of the first level is input to the first input end 301 of the second logic unit, and the signal of the first level is input to the second input end 302 of the second logic unit. After the input signal simultaneously undergoes the logical operation of the second logic unit 30, the output signal of the output terminal 303 of the second logic unit is at the second level; after the charge and discharge control unit 10 completes charging, the third terminal 103 of the charge and discharge control unit becomes the first level due to the completion of charging of the charge and discharge control unit. Therefore, the signal of the first input terminal 201 of the first logic unit is at the first level. After the logical operation of the first logic unit, the signal of the output terminal 203 of the first logic unit is at the second level. The second level signal is input to the first input terminal 301 of the second logic unit. After undergoing the logical operation of the second logic unit 30 simultaneously with the input signal at the first level, the output signal of the output terminal 303 of the second logic unit changes from the second level before charging to the first level.

[0057] That is, when the input signal is at the first level, the output signal is at the second level before the charge and discharge control unit 10 is fully charged. However, by charging the charge and discharge control unit 10, after the charge and discharge control unit 10 is fully charged, the output signal changes from the second level to the first level.

[0058] When the input signal is at the second level, the signal at the first end 101 of the charge and discharge control unit is at the second level, and the charge and discharge control unit 10 is in a ready-to-discharge state. Before the charge and discharge control unit 10 completes discharging, the signal at the third end 103 of the charge and discharge control unit is at the first level. After the operation of the first and second logic units, the output signal is at the first level.

[0059] The charge and discharge control unit 10 begins discharging and discharges toward its first terminal 101. After discharge is completed, the signal output by the third terminal 103 of the charge and discharge control unit is at the second level, and the first input terminal 201 of the first logic unit is at the first level. Therefore, after the logic operation of the first logic unit 20, the signal output by the output terminal 203 of the first logic unit is at the first level. This first-level signal is input to the first input terminal 301 of the second logic unit. After the logic operation of the second logic unit 30 and the input signal at the second level input to the second input terminal 302 of the second logic unit are simultaneously performed, the output signal of the output terminal 303 of the second logic unit remains at the first level.

[0060] That is, when the input signal is at the second level, the level of the output signal of the charge-discharge control unit 10 remains unchanged at the first level even after the discharge is completed.

[0061] According to the above description, it can be seen that regardless of whether the input signal is the first level or the second level, after passing through the protection circuit of the embodiment of the present application, the output signal is ultimately in the first level state. Only when the input signal is the first level will the output signal briefly stay at the second level, and the time it stays at the second level depends on the charging time of the charge and discharge control unit 10. Therefore, the output signal can be corrected by controlling the charging time of the charge and discharge control unit 10, so that regardless of whether the output signal is normal (whether it is the first level or the second level), the output signal can be maintained in an ideal state (first level), thereby protecting the subsequent circuit connected to the output signal.

[0062] In some embodiments, referring to FIG3 , the protection circuit 300 further includes a signal conversion unit 40 , wherein:

[0063] The first terminal 401 of the signal conversion unit is used to receive the initial input signal, and the second terminal of the signal conversion unit 402 is connected to the first terminal 101 of the charge and discharge control unit;

[0064] The signal conversion unit 40 is configured to convert the initial input signal into a target input signal that matches the power supply system of the protection circuit 300 , and maintain the consistency of level attributes between the initial input signal and the target output signal.

[0065] Among them, the consistency of level attributes means that if the level of the initial input signal is the first level, the level of the target output signal output after passing through the signal conversion unit 40 is also the first level; if the level of the initial input signal is the second level, the level of the target output signal output after passing through the signal conversion unit 40 is also the second level.

[0066] In this embodiment, since the power supply system of the device providing the initial input signal may be different from the power supply system of the protection circuit in the embodiment of the present application, the provided signals may be mismatched. Through the signal conversion unit 40, conversion can be performed between signals of different power supply systems to ensure the matching between the signals without changing their level properties.

[0067] In some embodiments, referring to FIG4a, the signal conversion unit 40 may include 2N NAND gate elements, where N is a positive integer and 2N is 2, 4, 6, etc., and each NAND gate element is connected in series. By setting a number of 2N NAND gate elements, it is possible to achieve signal conversion at a conditional signal level while maintaining consistency in the level attributes between the input and output signals.

[0068] In other embodiments, referring to FIG4b , the signal conversion unit 40 may include 2N NOT gate elements, where N is a positive integer and 2N is 2, 4, 6, etc., and each NOT gate element is connected in series. By setting a number of 2N NOT gate elements, it is possible to achieve signal conversion at a conditional signal level while maintaining consistency in the level attributes between the input and output signals.

[0069] In some embodiments, as shown in FIG3 , the charge and discharge control unit 10 may include a capacitor element C1 , a rectifier element D1 , and a resistor element R1 , wherein:

[0070] The first end a of the resistor element R1 is connected to the output end 402 of the signal conversion unit, and the second end b of the resistor element R1 is connected to the first input end 201 of the first logic unit;

[0071] The negative terminal (-) of the rectifier element D1 is connected to the first terminal a of the resistor element R1, and the positive terminal (+) of the rectifier element D1 is connected to the second terminal b of the resistor element R1;

[0072] The positive terminal (+) of the capacitor C1 is connected to the second end b of the resistor R1 , and the negative terminal (−) of the capacitor C1 is grounded.

[0073] Among them, the rectifier element D1 can be implemented by a diode or based on other elements, as long as it can enable the capacitor element C1 to discharge when the charge and discharge control unit discharges, and discharge from the second end b of the resistor element R1 to the first end a of the resistor element R1.

[0074] In some embodiments, referring to FIG5 , the protection circuit may further include a switch circuit 60 ; wherein,

[0075] The switch circuit 60 includes a metal-oxide semiconductor field effect transistor (MOS) element. The gate G of the MOS element is connected to the output signal so that when the output signal is at a first level, the MOS element in the switch circuit 60 is not conductive, and the switch circuit 60 is in an off state.

[0076] The type of the MOS field effect transistor element can be either a P-channel type or an N-channel type. Depending on the type of the MOS field effect transistor element, the element connection method can be modified so that when the output signal is at the first level, the MOS field effect transistor element is not turned on, thereby placing the switch circuit 60 in an off state.

[0077] In some embodiments, as shown in reference figure 5, the protection circuit may further include a level control unit 50, wherein the level control unit 50 may include at least one resistor element, wherein the resistor element may serve as a pull-up resistor or a pull-down resistor. Through the pull-up resistor or the pull-down resistor, when no input signal is connected, the input end of the protection circuit can have a clear first level or a second level, rather than being in an uncertain level state, thereby protecting the state of the protection circuit.

[0078] More specifically, referring to FIG. 3 to FIG. 6 , the signal flow when the input signal has different level attributes is described in detail.

[0079] When the input signal is at the first level, after passing through the signal conversion unit 40, the level attribute of the signal at the output terminal 402 of the signal conversion unit is also the first level, thereby charging the capacitor element C1, so that the first input terminal 201 of the first logic unit obtains the first level with a delay. Before obtaining the first level, the first input terminal 201 of the first logic unit is at the second level. At this time, the output terminal 203 of the first logic unit is at the first level, and the output terminal 303 of the second logic unit is at the second level. At this time, the field effect transistor element MOS is in the on state, and the maintenance time of this on state is the charging time of the capacitor element C1.

[0080] By adjusting the capacitance of the capacitor element C1, or adjusting the resistance value of the resistor element R1, or by comprehensively adjusting the capacitance of the capacitor element C1 and the resistance value of the resistor element R1, the charging time of the capacitor element C1 can be adjusted, that is, the charging time of the charging unit 10 can be adjusted, and then the conduction time of the field effect transistor element MOS can be adjusted, thereby timely adjusting the field effect transistor element MOS to a non-conducting state.

[0081] When the input signal is at the second level, the level attribute of the signal at the output terminal 402 of the signal conversion unit is also at the second level. At this time, the capacitor element C1 in the charged state will discharge to the output terminal 402 of the signal conversion unit to return to zero. That is, it takes a period of time for the first input terminal 201 of the first logic unit to become the second level. At this time, the output terminal 203 of the first logic unit is at the first level. Therefore, the output signal of the output terminal 303 of the second logic unit is at the first level, resulting in the field effect transistor element MOS being in the off state.

[0082] Through the above-described embodiment, by providing the first logic unit, the second logic unit, and the capacitor, it is possible to control costs and structural complexity, and to achieve intermittent on and off of the field-effect transistor (MOS) element. Moreover, regardless of whether the input signal is at the first level or the second level, the MOS field-effect transistor element will be turned off. Only when the input signal is at the first level will the field-effect transistor element be turned on for a period of time. For example, by controlling the capacitance of the capacitor element, this on-time can be controlled to tens of milliseconds. Therefore, it is possible to achieve a protective effect on subsequently connected circuits (for example, a storage capacitor charging circuit).

[0083] Next, the present application further provides a lamp pump charging circuit, which can be used in a power supply system of a solid-state laser. Referring to FIG6 , the lamp pump charging circuit may include a single-chip microcomputer 301, a xenon lamp 304, an energy storage capacitor 303, an energy storage capacitor charging circuit 302, and a protection circuit 300 of any one or more of the above-mentioned embodiments.

[0084] The energy storage capacitor 303 is used to provide energy to the xenon lamp 304 when the xenon lamp 304 is discharged;

[0085] The single chip microcomputer 301 is used to connect the input signal to the protection circuit 300;

[0086] The energy storage capacitor charging circuit 302 is used to charge the energy storage capacitor 303;

[0087] During the process of the energy storage capacitor 303 discharging the xenon lamp 304 to provide energy:

[0088] When the input signal is at the first level, the output signal of the protection circuit 300 changes from the second level to the first level after the charging and discharging control unit 10 completes charging, so that the energy storage capacitor charging circuit 302 of the energy storage capacitor 303 is in a disconnected state;

[0089] When the input signal is at the second level, the output signal of the protection circuit 300 is still at the first level after the charge and discharge control unit 10 completes charging, so that the energy storage capacitor charging circuit 302 of the energy storage capacitor 303 is in a disconnected state.

[0090] Through the above-mentioned lamp pump charging circuit, when the energy storage capacitor discharges the xenon lamp to provide energy, no matter whether the input signal provided by the single-chip microcomputer is the first level or the second level, the energy storage capacitor charging circuit of the energy storage capacitor can be in a disconnected state. Therefore, no matter whether the input signal of the single-chip microcomputer is abnormal, the lamp pump charging circuit can disconnect the energy storage capacitor charging circuit of the energy storage capacitor when the energy storage capacitor discharges the xenon lamp to provide energy, thereby stopping the charging of the energy storage capacitor, thereby avoiding dangerous situations such as circuit burning due to the continuous operation of the energy storage capacitor charging circuit.

[0091] For the structure of the protection circuit in the lamp pump charging circuit and how to achieve level control, reference may be made to the aforementioned embodiments of the protection circuit, which will not be described in detail here.

[0092] Next, the present application also provides a power supply system for a solid-state laser, as shown in FIG1 . The power supply system 100 for the solid-state laser includes a lamp pump charging circuit 200 of any of the above-mentioned embodiments. The lamp pump charging circuit 200 includes a protection circuit 300 of any of the above-mentioned embodiments, thereby improving the safety of the power supply system for the solid-state laser when the xenon lamp is discharging.

[0093] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the characters in this document generally indicate that the related objects are in an "or" relationship.

[0094] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A protection circuit, applied to a lamp pump charging circuit of a power supply system of a solid-state laser, comprising a charge and discharge control unit, a first logic unit and a second logic unit; The first end of the charge and discharge control unit is configured to receive an input signal, the second end of the charge and discharge control unit is grounded, the third end of the charge and discharge control unit is connected to the first input end of the first logic unit, the second input end of the first logic unit is connected to a supply voltage, the output end of the first logic unit is connected to the first input end of the second logic unit, the second input end of the second logic unit is configured to receive the input signal, and the output end of the second logic unit is configured to output an output signal; The first logic unit is configured to perform a negative AND operation on the level of the input signal and then output the result; The second logic unit is configured to perform a negative AND operation on the level of the input signal and then output the result; The charge and discharge control unit is configured to, when the input signal is at the first level, cause the output signal at the output end of the second logic unit to change from the second level to the first level after the charge and discharge control unit is charged; as well as The charge and discharge control unit is further configured to, when the input signal is at the second level, enable the output signal at the output end of the second logic unit to maintain the first level after the charge and discharge control unit completes discharging.

2. The circuit according to claim 1, characterized in that The protection circuit further comprises a signal conversion unit, wherein the input signal comprises a target input signal and an initial input signal; The first end of the signal conversion unit is configured to receive the initial input signal, and the second end of the signal conversion unit is connected to the first end of the charge and discharge regulation unit; as well as The signal conversion unit is configured to convert the initial input signal into a target input signal that matches the power supply system of the protection circuit, and maintain the consistency of level attributes of the initial input signal and the target output signal.

3. The circuit according to claim 2, characterized in that The charge and discharge control unit includes a capacitor element, a rectifier element and a resistor element; The first end of the resistor element is connected to the output end of the signal conversion unit, and the second end of the resistor element is connected to the first input end of the first logic unit; The negative terminal of the rectifying element is connected to the first terminal of the resistive element, and the positive terminal of the rectifying element is connected to the second terminal of the resistive element; and The positive terminal of the capacitor is connected to the second end of the resistor, and the negative terminal of the capacitor is grounded.

4. The circuit according to claim 3, characterized in that The resistance value of the resistor element is adjustable; and / or the capacitance of the capacitor element is adjustable.

5. The circuit according to claim 2, characterized in that The signal conversion unit includes 2N NAND gate elements, or the signal conversion unit includes 2N NOT gate elements; wherein N is a positive integer.

6. The circuit according to claim 1, characterized in that The first logic unit is configured as a NAND gate element, and the second logic unit is configured as a NAND gate element.

7. The circuit according to claim 1, characterized in that The protection circuit also includes a level control unit; The level control unit is connected to the input end of the signal conversion unit, and the level control unit is configured to control the protection circuit to be in a preset level state when the input signal is not connected.

8. The circuit according to claim 1, characterized in that The protection circuit also includes a switch circuit; wherein, The switch circuit includes a field effect transistor element, and a gate of the field effect transistor element is connected to the output signal, so that when the output signal is at a first level, the switch circuit is in an off state.

9. A lamp pump charging circuit, comprising: A xenon lamp, an energy storage capacitor, an energy storage capacitor charging circuit, a single chip microcomputer and a protection circuit according to any one of claims 1 to 8; wherein, The energy storage capacitor is configured to provide energy to the xenon lamp when the xenon lamp is discharged; The single chip microcomputer is configured to connect the input signal to the protection circuit; The energy storage capacitor charging circuit is configured to charge the energy storage capacitor; In the process of the energy storage capacitor discharging the xenon lamp to provide energy, When the input signal is at the first level, the output signal of the protection circuit changes from the second level to the first level after the charging and discharging control unit completes charging, so that the energy storage capacitor charging circuit of the energy storage capacitor is in a disconnected state; and When the input signal is at the second level, the output signal of the protection circuit is still at the first level after the charging and discharging control unit completes charging, so that the energy storage capacitor charging circuit of the energy storage capacitor is in a disconnected state.

10. A power supply system for a solid-state laser, comprising the lamp pump charging circuit according to claim 9.

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