Electromagnet shutter drive circuit and laser device

Abstract

This invention proposes an electromagnet shutter driving circuit and a laser device. The electromagnet shutter driving circuit includes: a first switch, a first diode, and a driving circuit; the first terminal of the first switch is used to connect to a first voltage, and the second terminal is connected to the coil of the electromagnet; the anode of the first diode is used to connect to a second voltage, and the cathode is connected to the coil and the second terminal of the first switch; the input terminal of the driving circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch; the first voltage value is greater than the second voltage value; the driving circuit is used to output an electrical signal when the second voltage is connected, and the electrical signal is used to control the first switch to turn off. This invention uses the first voltage to start the electromagnet and uses a lower amplitude second voltage to maintain the electromagnet, reducing the heat generated by the electromagnet when it is energized; wherein, the driving circuit turns off the path from the first voltage to the electromagnet when the second voltage is connected, thus completing the switching.

Description

Technical Field

[0001] This utility model relates to the field of electromagnet drive technology, and in particular to an electromagnet optical shutter drive circuit and a laser device. Background Technology

[0002] For high-energy laser products, an optical shutter is almost always required to open and close the optical path to ensure the safety of the emitted light. Currently, optical shutters use rotating electromagnets to open and close the optical path. The electromagnet contains a coil that is energized. When energized, it generates a magnetic field that drives the magnet structure to move, thereby opening or closing the optical path. However, the electromagnet coil heats up when energized. Under the starting voltage, it will generate severe heat over a long period of time, and the temperature of the entire component may even reach hundreds of degrees Celsius. Over time, this will affect the lifespan of the device or even damage it, thereby affecting the performance of the optical path and causing the overall product to fail. Utility Model Content

[0003] The main purpose of this invention is to provide an electromagnet shutter drive circuit, which aims to reduce the heat generated by the electromagnet when it is energized.

[0004] To achieve the above objectives, the electromagnet light shutter driving circuit proposed in this utility model includes: First switch, first diode, and driving circuit; The first terminal of the first switch is used to connect to a first voltage, and the second terminal is connected to the coil of the electromagnet; the anode of the first diode is used to connect to a second voltage, and the cathode is connected to the coil and the second terminal of the first switch. The input terminal of the driving circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch; the first voltage value is greater than the second voltage value. The driving circuit is used to output an electrical signal when a second voltage is applied, and the electrical signal is used to control the first switch to turn off.

[0005] Optionally, the electromagnet light shutter driving circuit further includes: a voltage conversion circuit; The input terminal of the voltage conversion circuit is used to receive the first voltage, and the output terminal is connected to the input terminal of the driving circuit and the anode of the first diode. The voltage conversion circuit is used to convert the first voltage into a second voltage and output it when the first voltage is applied.

[0006] Optionally, the electromagnet light shutter driving circuit further includes: a delay circuit; The input terminal of the delay circuit is connected to the output terminal of the voltage conversion circuit, and the output terminal is connected to the input terminal of the driving circuit and the anode of the first diode. The delay circuit is used to output a second voltage to the input terminal of the driving circuit and the anode of the first diode after a preset delay when the second voltage is applied.

[0007] Optionally, the delay circuit includes: a first resistor and a first capacitor connected in parallel; The first terminal of the first capacitor is connected to the input terminal of the driving circuit and the anode of the first diode, and the second terminal is grounded.

[0008] Optionally, the electromagnet optical shutter driving circuit further includes: a second diode; The anode of the second diode is connected to the second terminal of the first switch, and the cathode is connected to the cathode of the first diode and the coil of the electromagnet.

[0009] Optionally, the first switch is an enhancement-mode PMOS transistor; the source of the enhancement-mode PMOS transistor is used to connect to a first voltage, and the drain is electrically connected to the coil of the electromagnet. The driving circuit includes: a second resistor, a first driving circuit, and a second driving circuit; The first end of the second resistor is connected to the source of the enhancement-mode PMOS transistor, and the second end is connected to the gate of the enhancement-mode PMOS transistor; the first end of the first driving circuit is connected to the gate of the enhancement-mode PMOS transistor, the second end is grounded, and the controlled end is connected to the source of the enhancement-mode PMOS transistor. The first driving circuit is used to turn on the path between the gate of the enhancement-type PMOS transistor and ground when a first voltage is applied, so as to turn on the enhancement-type PMOS transistor. The control terminal of the second driving circuit is used to connect to the second voltage, the first terminal is connected to the controlled terminal of the first driving circuit, and the second terminal is grounded. The second driving circuit is used to connect the controlled terminal of the first driving circuit and ground when a second voltage is received.

[0010] Optionally, the first driving circuit includes: The third resistor, the fourth resistor, and the NPN transistor; The first end of the third resistor is connected to the gate of the enhancement-type PMOS transistor and the second end of the second resistor, and the second end is connected to the collector of the NPN transistor; the emitter of the NPN transistor is grounded, and the base is connected to the second end of the fourth resistor; the first end of the fourth resistor is connected to the first end of the second driving circuit and the source of the enhancement-type PMOS transistor.

[0011] Optionally, the second driving circuit includes: Fifth resistor, sixth resistor, second capacitor, and NMOS transistor; The first end of the fifth resistor is used to connect to the second voltage, and the second end is connected to the gate of the NMOS transistor, the first end of the sixth resistor, and the first end of the second capacitor; the second end of the sixth resistor, the second end of the second capacitor, and the source of the NMOS transistor are connected and grounded.

[0012] Optionally, the first driving circuit further includes: a seventh resistor; The first end of the seventh resistor is connected to the base of the NPN transistor, and the second end is connected to the emitter of the NPN transistor.

[0013] This utility model also proposes a laser device, including the electromagnet optical shutter drive circuit.

[0014] This invention proposes an electromagnet shutter driving circuit, comprising: a first switch, a first diode, and a driving circuit; a first terminal of the first switch is used to connect to a first voltage, and a second terminal is connected to the coil of the electromagnet; the anode of the first diode is used to connect to a second voltage, and the cathode is connected to the coil and the second terminal of the first switch; the input terminal of the driving circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch; the first voltage value is greater than the second voltage value; the driving circuit is used to output an electrical signal when the second voltage is connected, and the electrical signal is used to control the first switch to turn off. This invention uses a first voltage to start the electromagnet and a second voltage with a lower amplitude to maintain the electromagnet, reducing the heat generated by the electromagnet when it is energized; wherein, the driving circuit turns off the path from the first voltage to the electromagnet when the second voltage is connected, thus completing the switching. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 2 This is a schematic diagram of the first structure of the first embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 3 This is a schematic diagram of the second structure of the first embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 4 This is a schematic diagram of the third structure of the first embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 5This is a schematic diagram of the first structure of the second embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 6 This is a schematic diagram of the second structure of the second embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 7 This is a schematic diagram of the third structure of the second embodiment of the electromagnet light shutter drive circuit of this utility model; Figure 8 This is a schematic block diagram of the modular structure of the laser device of this utility model during operation; Figure 9 This is a schematic block diagram of the module structure of the laser device of this utility model when it is not in operation.

[0017] Explanation of icon numbers:

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] Electromagnets have a characteristic that, although they have a high starting voltage, once fully powered on and the magnetism reaches its maximum, they can maintain their state with a lower voltage. Prolonged operation at a lower voltage significantly reduces heat generation, thus ensuring the long-term stability of the device. For example, a 24V power-on start-up followed by a short delay before automatically switching to 12V for maintenance demonstrates that this method can reduce the heat generated by the electromagnet during prolonged operation.

[0024] Based on the above concept, this utility model proposes an electromagnet light shutter driving circuit, comprising: First switch, first diode D1, and driving circuit; The first terminal of the first switch is used to connect to the first voltage, and the second terminal is connected to the coil of the electromagnet; the anode of the first diode D1 is used to connect to the second voltage, and the cathode is connected to the coil and the second terminal of the first switch. The input terminal of the drive circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch; the first voltage value is greater than the second voltage value. The driving circuit is used to output an electrical signal when a second voltage is applied, and the electrical signal is used to control the first switch to turn off.

[0025] It should be noted that the driving circuit proposed in this utility model is used to drive the electromagnet to realize the opening / closing of the shutter. In particular, it uses hardware to realize the electromagnet being energized at a higher voltage and maintained at a lower voltage.

[0026] like Figure 1 As shown, the first switch is located in the circuit of the first voltage and the electromagnet coil. It is easy to understand that whether the electromagnet coil is energized affects the switching state of the electromagnet. Furthermore, the first voltage value is greater than the second voltage value. This invention does not limit the source of the first and second voltages; they can be provided by a power supply device selected by the developer, such as the power supply circuit in the device containing the electromagnet shutter drive circuit. Moreover, this invention does not limit the specific values ​​of the first and second voltages.

[0027] In this invention, a higher voltage is needed to energize the electromagnet, and then a lower voltage is used to maintain it. Therefore, a first voltage is applied first, followed by a second voltage; that is, the electromagnet shutter drive circuit first connects to the first voltage to energize the electromagnet, and then connects to the second voltage. Thus, the first switch can be a normally closed switch, or the first switch can be used to conduct when the first voltage value is applied. Furthermore, the input terminal of the drive circuit is connected to the second voltage, and the output terminal is connected to the controlled terminal of the first switch, meaning the drive circuit can influence the switching state of the first switch.

[0028] Specifically, when the second voltage is applied, the drive circuit outputs an electrical signal to control the first switch to turn off. It should be noted that in this invention, all components are applied to the second voltage simultaneously, without any sequential distinction. However, in the specific circuit, the anode of the first diode D1 is used to apply the second voltage, and the cathode is connected to the coil and the second terminal of the first switch. Since the drive circuit needs time to output the electrical signal after applying the second voltage, and since the first switch also needs time to turn off, this invention can include the following situation within its protection scope: the moment the second voltage is applied to the anode of the first diode D1 is slightly later than the moment the drive circuit applies the second voltage. The duration between the two moments can be determined based on the reaction time of the drive circuit and the turn-off time of the first switch. Furthermore, considering the presence of the coil, the voltage value at the second terminal of the first switch slowly decreases during the short period after the first switch is turned off. Therefore, the duration between the two moments can be appropriately extended based on the time it takes for the voltage value at the second terminal of the first switch to drop to the second voltage value.

[0029] It is readily understood that the electromagnet shutter drive circuit proposed in this invention is applicable when the application of the first voltage precedes the application of the second voltage. Furthermore, the first and second voltages are provided by the developers using relevant equipment based on the characteristics of the circuit; they should not be considered as features of the hardware structure proposed in this invention.

[0030] The first diode D1 is used to provide a unidirectional conduction path to prevent the current corresponding to the first voltage from flowing back into the device providing the second voltage; in addition, after the first switch is turned off, the second voltage is used to provide current in time to maintain the state of the electromagnet.

[0031] It is particularly important to emphasize that the driving circuit is closely related to the type of the first switch. If the first switch is a depletion-type device, it is initially in the on state. After the first voltage is applied, the electromagnet is energized. When the second voltage is applied, the driving circuit outputs an electrical signal to turn off the first switch. For example, if the first switch is an N-channel depletion-type MOSFET, the driving circuit can turn off the first switch by grounding the controlled terminal (gate) of the first switch and outputting zero voltage. If the first switch is a P-channel depletion-type MOSFET, the driving circuit can turn off the first switch by outputting a voltage higher than the first voltage value to ground the controlled terminal (gate) of the first switch (this case can be almost ignored because P-channel depletion-type MOSFETs are rarely used).

[0032] If the first switch is an enhancement-mode device, an impedance element (e.g., a resistor) can be used to connect the first terminal of the first switch to the controlled terminal. The first switch is initially off; after the first voltage is applied, the first switch turns on. When the second voltage is applied, the drive circuit outputs an electrical signal to turn off the first switch. For example, if the first switch is an N-channel enhancement-mode MOSFET, the drive circuit can output a voltage higher than the turn-on voltage of the N-channel enhancement-mode MOSFET to the controlled terminal. When the second voltage is applied, the drive circuit outputs an electrical signal to lower the potential of the N-channel enhancement-mode MOSFET (e.g., ground), thereby turning off the N-channel enhancement-mode MOSFET. If the first switch is a P-channel enhancement-mode MOSFET, the drive circuit can turn on the P-channel enhancement-mode MOSFET by grounding its controlled terminal. Additionally, when the second voltage is applied, the drive circuit simply disconnects the gate of the P-channel enhancement-mode MOSFET from ground. The drive circuit can control whether the gate of the P-channel enhancement-mode MOSFET is connected to ground via a switch.

[0033] This invention proposes an electromagnet shutter driving circuit, comprising: a first switch, a first diode D1, and a driving circuit; the first terminal of the first switch is used to connect to a first voltage, and the second terminal is connected to the coil of the electromagnet; the anode of the first diode D1 is used to connect to a second voltage, and the cathode is connected to the coil and the second terminal of the first switch; the input terminal of the driving circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch; the first voltage value is greater than the second voltage value; the driving circuit is used to output an electrical signal when the second voltage is connected, and the electrical signal is used to control the first switch to turn off. This invention uses the first voltage to start the electromagnet and uses a lower amplitude second voltage to maintain the electromagnet, reducing the heat generated by the electromagnet when it is energized; wherein, the driving circuit turns off the path from the first voltage to the electromagnet when the second voltage is connected, thus completing the switching.

[0034] In the first embodiment, as Figure 2 As shown, the electromagnet light shutter drive circuit also includes: a voltage conversion circuit; The input terminal of the voltage conversion circuit is used to connect to the first voltage, and the output terminal is connected to the input terminal of the drive circuit and the anode of the first diode D1; A voltage conversion circuit is used to convert a first voltage into a second voltage for output when a first voltage is applied.

[0035] It should be noted that the preceding text requires setting a first voltage and a second voltage for the electromagnet shutter drive circuit, and also requires setting the timing of the first and second voltages. This embodiment provides a more convenient method. In this embodiment, the second voltage is obtained by converting the first voltage; that is, the timing of the second voltage lags behind the timing of the first voltage, which aligns with the requirement of the electromagnet shutter drive circuit to first use a higher voltage to start the electromagnet, and then use a lower voltage to maintain the electromagnet. The voltage conversion circuit essentially steps down the first voltage before outputting it. The voltage conversion circuit may include a step-down circuit.

[0036] Voltage conversion circuits can step down chips, such as ME3116AM6G.

[0037] like Figure 3 As shown, the electromagnet light shutter drive circuit also includes: a delay circuit; The input terminal of the delay circuit is connected to the output terminal of the voltage conversion circuit, and the output terminal is connected to the input terminal of the drive circuit and the anode of the first diode D1. The delay circuit is used to output the second voltage to the input terminal of the drive circuit and the anode of the first diode D1 after a preset delay when the second voltage is applied.

[0038] It's easy to understand that, considering the possibility that the electromagnet might not fully activate due to the voltage conversion circuit, causing the drive circuit to turn off the first switch, an active delay is required. This delay circuit is placed between the output of the voltage conversion circuit and the input of the drive circuit, delaying the moment the second voltage is applied to the drive circuit. Specifically, the delay circuit, when the second voltage is applied, outputs the second voltage to the input of the drive circuit and the anode of the first diode D1 after a preset delay.

[0039] The delay circuit ensures that the second voltage is switched on to maintain operation only after the electromagnet has fully started.

[0040] The delay circuit includes: a first resistor and a first capacitor connected in parallel; The first terminal of the first capacitor is connected to the input terminal of the drive circuit and the anode of the first diode D1, and the second terminal is grounded.

[0041] It's easy to understand that initially (when not powered on, the voltage conversion circuit is not working), the voltage across the first capacitor is zero. When the voltage conversion circuit outputs the second voltage, current flows through the resistor to charge the first capacitor. As time progresses, the first capacitor gradually charges, and the voltage across its terminals slowly rises until it reaches the second voltage value. The rate of voltage rise is determined by the RC time constant. Only when the voltage across the first capacitor rises sufficiently to be recognized as a valid input by the drive circuit (e.g., reaching a logic high level or the turn-on threshold of the MOSFET), will the drive circuit output a control signal to turn off the first switch.

[0042] In one instance, such as Figure 4 As shown, the electromagnet light shutter drive circuit also includes: a second diode D2; The anode of the second diode D2 is connected to the second terminal of the first switch, and the cathode is connected to the cathode of the first diode D1 and the coil of the electromagnet.

[0043] To prevent a malfunction of the electromagnet from causing a voltage pulse to travel along the first switch into the device supplying the first voltage and damage the equipment, the anode of the second diode D2 is connected to the second terminal of the first switch, and the cathode is connected to the coil of the electromagnet.

[0044] In the second embodiment, the first switch is an enhancement-mode PMOS transistor; the source of the enhancement-mode PMOS transistor is used to connect to a first voltage, and the drain is electrically connected to the coil of the electromagnet. The driving circuit includes: a second resistor R2, a first driving circuit, and a second driving circuit; The first end of the second resistor R2 is connected to the source of the enhancement-mode PMOS transistor, and the second end is connected to the gate of the enhancement-mode PMOS transistor; the first end of the first driving circuit is connected to the gate of the enhancement-mode PMOS transistor, the second end is grounded, and the controlled end is connected to the source of the enhancement-mode PMOS transistor. A first driving circuit is used to turn on the path between the gate of an enhancement-type PMOS transistor and ground when a first voltage is applied, so as to turn on the enhancement-type PMOS transistor. The control terminal of the second drive circuit is used to connect to the second voltage, the first terminal is connected to the controlled terminal of the first drive circuit, and the second terminal is grounded. The second driving circuit is used to connect the controlled terminal of the first driving circuit and ground when a second voltage is received.

[0045] like Figure 5As shown, the first switch is an enhancement-mode PMOS transistor. The source of the enhancement-mode PMOS transistor is connected to a first voltage, and the gate is connected to a first driving circuit. The enhancement-mode PMOS transistor turns on when its gate-source voltage is less than a threshold voltage and turns off when its gate-source voltage is greater than a threshold voltage. Additionally, the source of the enhancement-mode PMOS transistor is connected to the first voltage. Therefore, in this embodiment, the first driving circuit controls the path between the gate and ground of the enhancement-mode PMOS transistor, and the second resistor R2 is used as an impedance element to connect the source and gate of the enhancement-mode PMOS transistor.

[0046] When the first voltage is applied, the following circuit path is formed: the first voltage passes through the second resistor R2 and the first drive circuit to ground. The gate-source voltage of the enhancement-type PMOS transistor is the opposite of the voltage across the second resistor R2. It is only necessary to adjust the voltage division factor of the voltage divider circuit formed by the second resistor R2 and the first drive circuit to ensure that the gate-source voltage is less than the threshold voltage. The first drive circuit may include a switching device for turning on / off the path between the gate of the enhancement-type PMOS transistor and ground.

[0047] It is easy to understand that the controlled terminal of the first driving circuit is connected to the source of the enhancement-mode PMOS transistor, and the first driving circuit is affected by the first voltage control. When the second voltage is applied, the second driving circuit opens the path between the controlled terminal of the first driving circuit and ground, pulls down the potential at the controlled terminal of the first driving circuit, causing the first driving circuit to turn off the path between the gate of the enhancement-mode PMOS transistor and ground. Therefore, under the action of the second resistor R2, the gate potential and source potential of the enhancement-mode PMOS transistor are equal, so the gate-source voltage of the enhancement-mode PMOS transistor is greater than the threshold voltage, and the enhancement-mode PMOS transistor is turned off.

[0048] The second driving circuit may include a switching device for turning on / off the path between the controlled terminal of the first driving circuit and ground, depending on whether a second voltage is received (the controlled terminal of the switching device may be connected to the second voltage).

[0049] In this embodiment, the type of the second switch is specified, and the structure of the corresponding driving circuit is provided, so that when the first voltage is applied, the first switch is turned on and the first voltage powers the electromagnet; when the second voltage is applied, the first switch is turned off and the second voltage maintains the working state of the electromagnet; thereby reducing the heat generated by the electromagnet when it is powered on.

[0050] In one example, such as Figure 6 As shown, the first driving circuit includes: The third resistor R3, the fourth resistor R4, and the NPN transistor; The first end of the third resistor R3 is connected to the gate of the enhancement-mode PMOS transistor and the second end of the second resistor R2, which is connected to the collector of the NPN transistor. The emitter of the NPN transistor is grounded, and the base is connected to the second end of the fourth resistor R4. The first end of the fourth resistor R4 is connected to the first end of the second driving circuit and the source of the enhancement-mode PMOS transistor.

[0051] It is easy to understand that in this example, the third resistor R3 and the NPN transistor are connected in series between the gate of the enhancement-type PMOS transistor and ground, and the base of the NPN transistor is connected to the source of the enhancement-type PMOS transistor through the fourth resistor R4 to apply the first voltage.

[0052] When the first voltage is applied, the NPN transistor turns on, forming the following electrical path: first voltage - second resistor R2 - third resistor R3 - NPN transistor - ground. Therefore, the gate-source voltage of the enhancement-mode PMOS transistor is the opposite of the voltage across the second resistor R2. Consequently, the enhancement-mode PMOS transistor turns on, and the first voltage powers the electromagnet.

[0053] It should be noted that when the NPN transistor is turned on, the fourth resistor R4 is a current-limiting resistor.

[0054] When the second voltage is applied, the second driving circuit connects the controlled terminal of the first driving circuit to ground, that is, pulls down the base potential of the NPN transistor to ground. The NPN transistor is turned off, the gate-source voltage of the enhancement-mode PMOS transistor is zero, and the enhancement-mode PMOS transistor is turned off.

[0055] In another example, refer to Figure 7 The second driving circuit includes: Fifth resistor R5, sixth resistor R6, second capacitor C2, and NMOS transistor; The first end of the fifth resistor R5 is used to connect to the second voltage, and the second end is connected to the gate of the NMOS transistor, the first end of the sixth resistor R6, and the first end of the second capacitor C2; the second end of the sixth resistor R6, the second end of the second capacitor C2, and the source of the NMOS transistor are connected to ground.

[0056] It is easy to understand that in this example, the NMOS transistor is placed between the base of the NPN transistor and ground. By controlling the NMOS transistor to conduct, the potential of the base of the NPN transistor is pulled down.

[0057] A sixth resistor, R6, is connected in parallel with a second capacitor, C2, and is positioned between the gate and source of the NMOS transistor. When the second voltage is applied, it first charges the second capacitor, C2, until the voltage across C2 exceeds the NMOS transistor's turn-on voltage, at which point the NMOS transistor turns on. The resistance of the fifth resistor, R5, and the capacitance of the second capacitor, C2, affect the charging time of C2. Conversely, the resistance of the sixth resistor, R6, and the capacitance of the second capacitor, C2, affect the discharging time of C2. By adjusting the resistance of the fifth resistor, R5, and the capacitance of the second capacitor, the delay time can be adjusted to ensure that the first voltage output is turned off only after the second voltage has stabilized.

[0058] The first driving circuit also includes: a seventh resistor R7; The first end of the seventh resistor R7 is connected to the base of the NPN transistor, and the second end is connected to the emitter of the NPN transistor.

[0059] The seventh resistor, R7, ensures reliable cutoff and prevents false triggering. When no current flows into the base (e.g., the signal source driving the transistor is in a high-impedance state, disconnected, or uninitialized), this resistor "pulls" the base potential to the same potential as the emitter (usually a low level), thus turning off the transistor. Additionally, when the first voltage is applied, the seventh resistor R7 provides a stable base-emitter voltage for the NPN transistor, turning it on.

[0060] This utility model also proposes a laser device, including a controller, a seed light source, an amplification circuit, a foot switch, an electromagnet, a shutter, and the aforementioned electromagnet-shutter drive circuit, wherein the electromagnet and the shutter are fixedly connected. (See reference...) Figure 8 The controller receives a signal from the foot switch and simultaneously controls the activation of the seed light source and the amplifier circuit, as well as the energization or de-energization of the electromagnet shutter drive circuit. When the controller receives the activation signal from the foot switch, it starts the seed light source to emit light and simultaneously energizes the electromagnet shutter drive circuit. This causes the electromagnet to be attracted to a position close to the electromagnet shutter drive circuit, moving the shutter plate so that it is no longer positioned between the seed light source and the amplifier circuit. The light emitted by the seed light source then reaches the amplifier circuit and is amplified. (Refer to...) Figure 9 When the controller does not receive a signal from the foot switch, it shuts off the seed light source. Simultaneously, the electromagnet shutter drive circuit is also de-energized. This de-energizes the electromagnet, causing the shutter to move between the seed light source and the amplification circuit under the influence of other mechanical structures (such as a spring, not shown in the figure). The specific structure of this electromagnet shutter drive circuit is as described in the above embodiments. Since this laser device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0061] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. All equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An electromagnet optical shutter driving circuit, characterized in that, include: First switch, first diode, and driving circuit; The first terminal of the first switch is used to connect to a first voltage, and the second terminal is connected to the coil of the electromagnet; The anode of the first diode is used to receive the second voltage, and the cathode is connected to the coil and the second terminal of the first switch; The input terminal of the driving circuit is used to connect to the second voltage, and the output terminal is connected to the controlled terminal of the first switch. The first voltage value is greater than the second voltage value; The driving circuit is used to output an electrical signal when a second voltage is applied, and the electrical signal is used to control the first switch to turn off.

2. The electromagnet optical shutter driving circuit as described in claim 1, characterized in that, The electromagnet light shutter driving circuit also includes: a voltage conversion circuit; The input terminal of the voltage conversion circuit is used to receive the first voltage, and the output terminal is connected to the input terminal of the driving circuit and the anode of the first diode. The voltage conversion circuit is used to convert the first voltage into a second voltage and output it when the first voltage is applied.

3. The electromagnet optical shutter driving circuit as described in claim 2, characterized in that, The electromagnet light shutter driving circuit also includes: a delay circuit; The input terminal of the delay circuit is connected to the output terminal of the voltage conversion circuit, and the output terminal is connected to the input terminal of the driving circuit and the anode of the first diode. The delay circuit is used to output a second voltage to the input terminal of the driving circuit and the anode of the first diode after a preset delay when the second voltage is applied.

4. The electromagnet optical shutter driving circuit as described in claim 3, characterized in that, The delay circuit includes: a first resistor and a first capacitor connected in parallel; The first terminal of the first capacitor is connected to the input terminal of the driving circuit and the anode of the first diode, and the second terminal is grounded.

5. The electromagnet optical shutter driving circuit as described in claim 1, characterized in that, The electromagnet light shutter driving circuit also includes: a second diode; The anode of the second diode is connected to the second terminal of the first switch, and the cathode is connected to the cathode of the first diode and the coil of the electromagnet.

6. The electromagnet optical shutter driving circuit as described in any one of claims 1 to 5, characterized in that, The first switch is an enhancement-mode PMOS transistor; the source of the enhancement-mode PMOS transistor is used to connect to the first voltage, and the drain is electrically connected to the coil of the electromagnet. The driving circuit includes: a second resistor, a first driving circuit, and a second driving circuit; The first end of the second resistor is connected to the source of the enhancement-mode PMOS transistor, and the second end is connected to the gate of the enhancement-mode PMOS transistor; the first end of the first driving circuit is connected to the gate of the enhancement-mode PMOS transistor, the second end is grounded, and the controlled end is connected to the source of the enhancement-mode PMOS transistor. The first driving circuit is used to turn on the path between the gate of the enhancement-type PMOS transistor and ground when a first voltage is applied, so as to turn on the enhancement-type PMOS transistor. The control terminal of the second driving circuit is used to connect to the second voltage, the first terminal is connected to the controlled terminal of the first driving circuit, and the second terminal is grounded. The second driving circuit is used to connect the controlled terminal of the first driving circuit and ground when a second voltage is received.

7. The electromagnet optical shutter driving circuit as described in claim 6, characterized in that, The first driving circuit includes: The third resistor, the fourth resistor, and the NPN transistor; The first end of the third resistor is connected to the gate of the enhancement-type PMOS transistor and the second end of the second resistor, and the second end is connected to the collector of the NPN transistor; the emitter of the NPN transistor is grounded, and the base is connected to the second end of the fourth resistor; the first end of the fourth resistor is connected to the first end of the second driving circuit and the source of the enhancement-type PMOS transistor.

8. The electromagnet optical shutter driving circuit as described in claim 7, characterized in that, The second driving circuit includes: Fifth resistor, sixth resistor, second capacitor, and NMOS transistor; The first end of the fifth resistor is used to connect to the second voltage, and the second end is connected to the gate of the NMOS transistor, the first end of the sixth resistor, and the first end of the second capacitor; the second end of the sixth resistor, the second end of the second capacitor, and the source of the NMOS transistor are connected and grounded.

9. The electromagnet optical shutter driving circuit as described in claim 7, characterized in that, The first driving circuit further includes: a seventh resistor; The first end of the seventh resistor is connected to the base of the NPN transistor, and the second end is connected to the emitter of the NPN transistor.

10. A laser device, characterized in that, Includes the electromagnet light shutter drive circuit as described in any one of claims 1 to 9.

Images